Exhaust Gas Purification System and Method and Data Processing System for Monitoring at least One Exhaust Gas Pufication System

Abstract

The present invention relates to a computer-implemented method for monitoring at least one exhaust gas purification system for purifying an exhaust gas stream to be purified of an industrial system or an industrial process. The method comprises retrieving system data of the exhaust gas purification system from a data cloud. The system data stored in the data cloud were at least partially received beforehand by the data cloud from the exhaust gas purification system. The system data relate to at least measurement data of at least one sensor of the exhaust gas purification system and/or data about at least one adjustable parameter of the exhaust gas purification system. The method further comprises determining at least one quantity characterizing the exhaust gas purification system based on the retrieved system data.

Claims

1. A computer-implemented method for monitoring at least one exhaust gas purification system for purifying an exhaust gas stream to be purified of an industrial system or an industrial process, the method comprising: retrieving system data of the exhaust gas purification system from a data cloud, wherein the system data stored in the data cloud were at least partially received beforehand by the data cloud from the exhaust gas purification system, and wherein the system data relate to at least measurement data of at least one sensor of the exhaust gas purification system and/or data about at least one adjustable parameter of the exhaust gas purification system; and determining at least one quantity characterizing the exhaust gas purification system based on the retrieved system data.

2. The computer-implemented method of claim 1, further comprising: providing information about the quantity characterizing the exhaust gas purification system for retrieval by an application executed on a terminal device of a user.

3. The computer-implemented method of claim 2, wherein the information about the quantity characterizing the exhaust gas purification system is provided on a web site with access restricted to a predetermined user group.

4. The computer-implemented method of claim 1, further comprising: storing information about the quantity characterizing the exhaust gas purification system in the data cloud.

5. The computer-implemented method of claim 1, wherein determining the at least one quantity characterizing the exhaust gas purification system is carried out continuously.

6. The computer-implemented method of claim 1, wherein the quantity characterizing the exhaust gas purification system is a quantity directly measurable at the exhaust gas purification system, which is not measured at the exhaust gas purification system.

7. The computer-implemented method of claim 6, wherein the quantity characterizing the exhaust gas purification system is a concentration of at least one pollutant in the exhaust gas stream to be purified which is fed into the exhaust gas purification system.

8. The computer-implemented method of claim 7, wherein the concentration of the at least one pollutant in the exhaust gas stream to be purified is determined from one of the following subsets of the retrieved system data: a) measurement values of a carbon dioxide sensor of the exhaust gas purification system which measures a carbon dioxide concentration in a purified exhaust gas stream which is transmitted from the exhaust gas purification system; b) measurement values of an explosimeter of the exhaust gas purification system that measures a concentration of potentially explosive gases in the exhaust gas stream to be purified; or c) measurement values of a mass flow sensor of the exhaust gas purification system that measures a mass flow of a fuel used for a thermal oxidation of the exhaust gas stream to be purified.

9. The computer-implemented method of claim 7, further comprising: determining a pollutant balance of the exhaust gas purification system for a predetermined period of time based on the determined concentration of the at least one pollutant in the exhaust gas stream to be purified.

10. The computer-implemented method of claim 9, wherein the pollutant balance is further based on an individual measurement value, which is comprised in the retrieved system data, of a concentration of the at least one pollutant in a purified exhaust gas stream that is transmitted from the exhaust gas purification system.

11. The computer-implemented method of claim 10, wherein the at least one pollutant is one or more solvents.

12. The computer-implemented method of claim 1, wherein the quantity characterizing the exhaust gas purification system is an energy consumption of the exhaust gas purification system for a predetermined period of time and/or a predetermined operation mode of the exhaust gas purification system.

13. The computer-implemented method of claim 12, wherein determining the energy consumption comprises the following: deriving from at least a part of the retrieved system data a quantity directly measurable at the exhaust gas purification system, which is not measured at the exhaust gas purification system; and determining the energy consumption based on the quantity derived.

14. The computer-implemented method of claim 1, wherein the quantity characterizing the exhaust gas purification system is an amount of process heat that is generated or may be generated by the exhaust gas purification system in a predetermined period of time.

15. The computer-implemented method of any of claim 1, wherein the quantity characterizing the exhaust gas purification system characterizes a separation process in the exhaust gas purification system in which at least one pollutant contained in the exhaust gas stream to be purified is separated.

16. The computer-implemented method according to any of claim 1, wherein the quantity characterizing the exhaust gas purification system characterizes a concentration process in the exhaust gas purification system in which a concentration of at least one pollutant contained in the exhaust gas stream to be purified is increased.

17. The computer-implemented method of any of claim 1, wherein the quantity characterizing the exhaust gas purification system characterizes a condensation process in which at least one pollutant contained in the exhaust gas stream to be purified is condensed.

18. The computer-implemented method of any of claim 1, further comprising: outputting a message to at least a terminal device of a user when the quantity characterizing the exhaust gas purification system is outside a predetermined value range.

19. The computer-implemented method of any of claim 1, further comprising: retrieving system data of a further exhaust gas purification system from the data cloud; determining the characterizing quantity for the further exhaust gas purification system based on the retrieved system data of the further exhaust gas purification system; and determining comparative information based on the characterizing quantity for the exhaust gas purification system and the characterizing quantity for the further exhaust gas purification system.

20. A non-transitory, computer-readable medium comprising a program code for performing the computer-implemented method of claim 1, when the program code is executed on a processor or a programmable hardware component.

21. A data processing system for monitoring the state of at least one exhaust gas purification system for purifying an exhaust gas stream to be purified of an industrial system or an industrial process, wherein the data processing system comprises at least one processor which is configured to: retrieve system data of the exhaust gas purification system from a data cloud, wherein the system data stored in the data cloud were at least partially received beforehand by the data cloud from the exhaust gas purification system, and wherein the system data relate to at least measurement data of at least one sensor of the exhaust gas purification system and/or data about at least one adjustable parameter of the exhaust gas purification system; and determine a quantity characterizing the exhaust gas purification system based on the retrieved system data.

22. The data processing system of claim 21, wherein the data processing system is part of the data cloud.

23. An exhaust gas purification system for purifying an exhaust gas stream to be purified of an industrial system or an industrial process, comprising: an inlet for feeding the exhaust gas stream to be purified into the exhaust gas purification system; an outlet for releasing a purified exhaust gas stream from the exhaust gas purification system; and a communication interface which is configured to send system data generated in the exhaust gas purification system to a data cloud, the system data relating to at least measurement data of at least one sensor of the exhaust gas purification system and data about at least one adjustable parameter of the exhaust gas purification system.

24. The exhaust gas purification system of claim 23, further comprising at least one of the following devices: a concentration device configured to increase a concentration of at least one pollutant contained in the exhaust gas stream to be purified; a condensation device configured to condense at least one pollutant contained in the exhaust gas stream to be purified; and a separation device configured to separate at least one pollutant contained in the exhaust gas stream to be purified.

Description

[0075] Embodiments of the present invention are explained in more detail below with reference to the accompanying figures, in which:

[0076] FIG. 1 schematically illustrates a monitoring system for an exhaust gas purification system;

[0077] FIG. 2 illustrates an embodiment of a graphical user interface in which various quantities characterizing an exhaust gas purification system are illustrated;

[0078] FIG. 3 illustrates an embodiment of operation modes of an exhaust gas purification system;

[0079] FIG. 4 illustrates an embodiment of a monitored exhaust gas purification system comprising a separation device; and

[0080] FIG. 5 illustrates an embodiment of a monitored exhaust gas purification system comprising a concentration device and a condensation device.

[0081] FIG. 1 shows a monitoring system 100 for an exhaust gas purification system 110, which is shown schematically and in a very simplified manner. The exhaust gas purification system 110 comprises an inlet 111 for feeding in an exhaust gas stream 101 to be purified of an industrial system such as a printing machine (not illustrated). Furthermore, the exhaust gas purification system 110 comprises at least one purifying device 114 for purifying the exhaust gas stream 101. For example, the purifying device 114 may purify the exhaust gas stream 101 according to one of the methods described above. The exhaust gas purification system 110 further includes an outlet 112 for transmitting a purified exhaust gas stream 102 from the exhaust gas purification system 110. The exhaust gas purification system 110 also includes at least one sensor 115 to measure a quantity of interest (e.g., a pressure or a concentration of one or more substances) at an element of the exhaust gas purification system 110.

[0082] Furthermore, the exhaust gas purification system 110 includes a (wireless or wired) communication interface 113 for connecting the exhaust gas purification system 110 to a data cloud 120. Via the communication interface 113, the exhaust gas purification system 110 may exchange data with the data cloud 120. In particular, the communication interface 113 is configured to send system data generated in the exhaust gas purification system to the data cloud 120. The communication interface 113 may thereby, for example, send the system data continuously, periodically or in an event-triggered manner to the data cloud 120. The system data may include both unprocessed raw data from the exhaust gas purification system 110 and preprocessed data from the exhaust gas purification system 110.

[0083] The system data are stored in a storage means 122 of the data cloud 120 (e.g. one or more hard disks), so that the system data may be accessed locally and at any time. Likewise, data loss may be omitted due to the data storage in the data cloud 120. Furthermore, further system data may be entered, for example, manually into the data cloud 120 or received from further systems (e.g. exhaust gas purification system identical or similar to exhaust gas purification system 120—not shown).

[0084] Furthermore, the data cloud 120 comprises at least one (virtual or physical) processor 121, which executes the inventive analysis of the system data for monitoring the exhaust gas purification system 110.

[0085] For this purpose, the processor 121 is set up to retrieve the system data of the exhaust gas purification system 110 from the storage means 122 of the data cloud 120 and to determine the quantity characterizing the exhaust gas purification system 110 based on the retrieved system data.

[0086] Using the quantity characterizing the exhaust gas purification system 110, the current or a past state or the behavior of the system may be described and thus presented to an operator or manufacturer of the exhaust gas purification system 110. Likewise, further characteristics of the exhaust gas purification system 110 may be derived by the processor 121 from the quantity characterizing the exhaust gas purification system 110. The determination of one or more quantities or characteristics characterizing the exhaust gas purification system 110 is carried out according to the principles described above. For example, the processor 121 may be configured to determine an energy consumption or a solvent balance of the exhaust gas purification system 110 according to the principles described above.

[0087] The information about the quantity characterizing the exhaust gas purification system 110 may also be stored in the data cloud 120.

[0088] Information about the one or more quantities characterizing the exhaust gas purification system may be displayed to a user, for example, via a graphical user interface generated by the processor 121, which the user may access via a terminal device 130 (e.g., a smartphone or a tablet computer). An example of a graphical user interface 200 is shown in FIG. 2. The graphical user interface 200 may, for example, be output via a dedicated application or as a web site on the terminal device 130 of the user.

[0089] In the upper right area of the graphical user interface 200, measured temperatures of the exhaust gas purification system 110, such as the temperatures of the exhaust gas stream to be purified, the purified exhaust gas stream, a bed (e.g., lower bed) of the exhaust gas purification system 110 or the combustion chamber, are illustrated as bars or bar charts. Alternatively, other quantities measured at the exhaust gas purification system 110 or the course of a quantity characterizing the exhaust gas purification system 110 derived from the system data may also be illustrated. For example, volume flows (measured directly or determined, for example, from the converter frequency of a fan), flap positions (e.g., hot gas flap), measurement values of LEL sensors or loading states or the state of a fuel injection may be displayed.

[0090] Below, a trend display for interesting quantities of the exhaust gas purification system 110 is integrated into the graphical user interface 200. Here, the course of a quantity measured at the exhaust gas purification system 110 or the course of a quantity characterizing the exhaust gas purification system 110 derived from the system data may be illustrated, for example.

[0091] In the lower area, an illustration of the operating hours of the exhaust gas purification system 110 for the individual operation modes is further integrated into the graphical user interface 200.

[0092] For example, the graphical user interface 200 may be configured individually for a user. Depending on the sensor equipment of the exhaust gas purification system 110, various quantities or parameters characterizing the exhaust gas purification system 110 may thereby be automatically determined or calculated from the system data and displayed to the user. The user may also use these quantities or parameters for required reports, for example. The output of the respective quantities or values for reports is conducted automatically and thus time-efficiently due to the stored calculation routines.

[0093] Furthermore, an event list relating to the various possible operation modes of the exhaust gas purification system 110 is illustrated in the upper left area of the graphical user interface 200. The operating states of the exhaust gas purification system 110 may be determined from the analyzed system data of the exhaust gas purification system 110.

[0094] An example for a hierarchical structure of a plurality of operation modes of an exhaust gas purification system for RTO is illustrated in FIG. 3. The exhaust gas purification system may generally be in either an off-mode operation 300, an on-mode operation 305, or a failure-mode 310.

[0095] While the exhaust gas purification system is in the on-mode operation 305, the exhaust gas purification system may be in a start-up-mode operation 315, in which the exhaust gas purification system heats up, or in a shutdown-mode operation 325, in which the exhaust gas purification system is switched off “normally” and flushed with fresh air (mode 326) or cooled after a failure (mode 327). During the on-mode operation 305, the exhaust gas purification system may also be in a purifying-mode operation 330, in which the exhaust gas purification system is purified, or a regular-mode operation 320, in which the exhaust gas stream is purified.

[0096] In the regular-mode operation 320, the exhaust gas purification system may be in a below-autothermal-mode operation 335, in which the exhaust gas is purified by means of RTO with an injection of a fuel to ensure a minimum combustion chamber temperature. Alternatively, the exhaust gas purification system may be in a stand-by-mode in the below-autothermal-mode operation 335, in which the combustion chamber temperature is maintained above a minimum temperature with minimum air supply.

[0097] Likewise, the exhaust gas purification system may be in an autothermal-mode operation 340 in the regular-mode operation 320, in which the exhaust gas is purified by means of RTO without the addition of further fuel, but hot gas cannot yet be dissipated for process heat recovery.

[0098] In the above-autothermal-mode operation 345, the exhaust gas is purified by means of RTO without adding further fuel and the hot gas flap in the exhaust gas purification system is set such as to dissipate the hot gas via a hot bypass for process heat recovery.

[0099] In the forced-cooling-mode operation 350, the exhaust gas is purified by means of RTO without the addition of further fuels and the maximum amount of hot gas is dissipated for process heat recovery. In order to protect the exhaust gas purification system from too high oxidation temperatures due to the exothermic nature of the solvent in the exhaust gas, cold air is additionally fed into the combustion chamber.

[0100] In the intentional-extraction-mode operation 355, the exhaust gas is purified by means of RTO with an injection of a fuel. At the same time, heat is extracted via the hot bypass of the exhaust gas purification system (controlled by the position of the hot gas flap).

[0101] The table below is an overview of the specifications for various adjustable parameters in some of the operation modes mentioned above. The actual values of the parameters may be measured via sensors of the exhaust gas purification system. The measurement values as well as the target values are stored in the data cloud by the exhaust gas purification system and are thus available for the inventive monitoring of the exhaust gas purification system.

TABLE-US-00001 combustion chamber natural gas hot mode temperature injection bypass below autothermal less than T1 Yes No autothermal between T1 and T2 No No above autothermal greater than T2 No Yes forced cooling greater than T3 No Yes intentional extraction any Yes Yes

[0102] Accordingly, it may be determined from the system data, according to the invention, whether the system behaves according to the specifications for the individual parameters during operation, for example. This allows an automated and efficient monitoring of the exhaust gas purification system.

[0103] FIG. 4 shows the monitoring of an exhaust gas purification system 400 with a separation device in the form of an electrostatic precipitator 410 (also referred to as an electrical separator, an electric separator, or an electrostatic separator). It should be noted that the electrostatic precipitator 410 is purely exemplary to illustrate a separation device for separating particles from an exhaust gas stream or exhaust air stream. As an alternative to the electrostatic precipitator 410, a cyclone separator or other filtering device may be used as a separation device, for example.

[0104] The exhaust gas purification system 400 comprises an inlet for feeding in an exhaust gas stream 401 to be purified of an industrial system. The electrostatic precipitator 410 is used to purify the exhaust gas stream 401. After purification by the electrostatic precipitator 410, the purified exhaust gas stream 402 is transmitted from the exhaust gas purification system 400 via an outlet.

[0105] The electrostatic precipitator 410 is used to separate particles (i.e., a coherent mass of solid or liquid matter) of, for example, a pollutant from the exhaust gas stream 401 to be purified. The functioning of an electrostatic precipitator is known per se and is described, for example, in the guideline VDI 3678 sheet 1 of the Association of German Engineers (VDI; Verein Deutscher Ingenieure). For a better understanding, some aspects of exhaust gas or exhaust air purification by means of electrostatic precipitators are highlighted again below.

[0106] The electrostatic precipitator 410 comprises a so-called spray electrode, which generates gas ions in the exhaust gas stream 401 to be purified by means of corona discharge. The pollutant particles contained in the exhaust gas stream 401 to be purified are charged by the ionized gas components and therefore perform a directed movement in the electric field of the electrostatic precipitator 410 towards one or more collecting electrodes (separation electrodes) of the electrostatic precipitator 410. In other words: The charged pollutant particles “migrate” to the collecting electrode(s). The collecting electrode(s) is/are purified and the pollutant particles are thus discharged from the exhaust gas stream.

[0107] In a dry electrostatic precipitator 410, the purification of the collecting electrode(s) is accomplished by (e.g., periodically) mechanically tapping the collecting electrode(s) such that the particle layer formed on the collecting electrode(s) is knocked off. In a wet electrostatic precipitator, the separated drops run down quasi-continuously (if applicable, assisted by rinsing with a liquid).

[0108] In general, various setups of the electrostatic precipitator 410 are possible. For example, the electrostatic precipitator 410 may be configured as a plate electrostatic precipitator or a tube electrostatic precipitator.

[0109] The effectiveness of the separation (i.e., the degree of separation) in the electrostatic precipitator 410 may be adjusted or influenced via a variety of parameters. In addition to the construction or design of the electrostatic precipitator 410 and the regulation of the electric field, for example, a volume flow of the exhaust gas stream 401 to be purified, a composition of the exhaust gas stream 401 to be purified (e.g., depending on the water or acid dew point), a temperature of the exhaust gas stream 401 to be purified, a pressure of the exhaust gas stream 401 to be purified, a particle concentration in the exhaust gas stream 401 to be purified (e.g. a raw gas dust concentration), a specific resistance of the particles (e.g., a specific dust resistance), a grain size distribution of the particles in the exhaust gas stream 401 to be purified, a number of particles in the exhaust gas stream 401 to be purified, a composition of the particles in the exhaust gas stream 401 to be purified (e.g., a dust composition), or a particle concentration to be achieved in the purified exhaust gas stream 402 may influence the effectiveness of the separation.

[0110] The raw gas 401 fed into the separator in the form of the electrostatic precipitator 410 is purified as previously described (i.e., the particulate load is reduced), so that the sufficiently purified clean gas 402 may be discharged.

[0111] At least one sensor 420 of the exhaust gas purification system 400 may collect (e.g., continuously, discontinuously, or aggregated over time) data regarding the exhaust gas stream 401 to be purified that is relevant for the separation process. Purely by way of example, the sensor 420 may measure, for example, one of the aforementioned parameters of the exhaust gas stream 401 to be purified.

[0112] In addition, data regarding the purified exhaust gas stream 402 may be collected by at least one further sensor 430. The second measuring point in the form of the at least one further sensor 430 is optional.

[0113] The measurement data of the sensors 420 and 430 are sent from the exhaust gas purification system 400 as system data to the data cloud 440, where they are analyzed according to the invention. If the sensors 420 and 430 determine, for example, particle numbers in the exhaust gas stream 401 to be purified and in the purified exhaust gas stream 402, the efficiency of the electrostatic precipitator 410, for example, may be determined therefrom in the data cloud 440. A user may access the data or analysis (e.g., using the graphical user interface illustrated in FIG. 2) via a terminal device 450.

[0114] Other data that may be sent as system data from the exhaust gas purification system 400 to the data cloud 440 is data present in a controller 460 (e.g., a Programmable Logic Controller, PLC) of the exhaust gas purification system 400. Accordingly, this data may also be used for characterization of the separation process in the electrostatic precipitator 410. The further data of the controller 460 may be, for example, a frequency of purification of the collecting electrode(s) (e.g., a frequency of “tapping” in a dry electrostatic precipitator 410), a quantity or mass of separated particles (may be derived or determined from a sensor measurement value, for example), an electrical energy requirement of individual components or aggregated to complete assemblies, a quantity or mass of a cleaning liquid used for purifying the collecting electrode(s) in the case of a wet electrostatic precipitator, a quantity or mass of the separated drops in the case of a wet electrostatic precipitator (may be derived or determined from a sensor measurement value, for example) or a number of flashovers in the electrostatic precipitator. It is to be noted that the aforementioned characteristics are chosen merely as examples and for illustration purposes. According to embodiments, the further data may also display additional, less, or different characteristics.

[0115] Some or several of the system data is used to monitor the exhaust gas purification system 400 or analyze the separation process in the electrostatic precipitator 410 after being received by the data cloud 440. For this purpose, one or more quantities characterizing the separation process may be determined by the data cloud 440. For example, an energy used for the electrostatic precipitator 410 may be determined depending on an efficiency of the electrostatic precipitator 410, a tapping interval of the collecting electrode(s) of the electrostatic precipitator 410 may be determined depending on an efficiency of the electrostatic precipitator 410, an electrical energy requirement of the electrostatic precipitator 410 may be determined depending on properties of the exhaust gas stream 401 to be purified, a current flow in the electrostatic precipitator 410 may be determined depending on properties of the exhaust gas stream 401 to be purified (e.g., tracking a temporal change trend) or an adjustment or readjustment for the field strength regulation of the electric field in the electrostatic precipitator 410 may be determined to avoid flashovers. The above-mentioned quantities characterizing the separation process are chosen merely as examples and for illustration purposes. According to embodiments, additional, less or other characterizing quantities may also be determined in the data cloud 440 based on the system data received from the exhaust gas purification system 400.

[0116] FIG. 5 illustrates the monitoring of an exhaust gas purification system 500 with solvent recovery. Solvents (e.g., organic solvents such as ethyl acetate, ethanol or isopropanol) are used in various production processes. The solvents sometimes represent a significant resource (costs in part considerably higher than 1 €/kg) so that a solvent recovery may be reasonable for technical and economic reasons.

[0117] In this context, an exemplary and very simplified industrial production system 560 is shown in FIG. 5 (e.g., a printing system or a coating system). In addition to the material to be processed (e.g., to be printed or coated), solvent is also fed into the production system 560 (e.g., bound in a printing ink). The solvent input into the production system 560 may be determined, e.g., from measurement values of a sensor 545 (which measures, e.g., the amount of ink in which the solvent is bound). In addition, information regarding the solvents or other relevant system parameters may be collected via one or more further sensors 547 at the production system 560 itself. In a printing system, the solvent is released and transmitted together with the exhaust gas stream 501 upon application of the ink, or at the latest upon drying. For reasons provided by the immission control law, for example, a release of the solvents into the environment is not permissible. Therefore, an exhaust gas purification is carried out by means of the industrial exhaust gas purification system 500.

[0118] As illustrated in FIG. 5, the solvent recovery may be carried out by means of various procedural steps. For example, the exhaust gas stream 501 to be purified may first be subjected to a concentration process and subsequently to a desorption process (e.g., by means of water vapor, hot gas or inert gas), before the desorbate generated by this (i.e., the concentrated exhaust gas stream) is fed into a condensation process in order to separate the solvent from the exhaust gas stream by means of condensation. This form of solvent recovery is illustrated in FIG. 5 by the concentration device 520 and the condensation device 510. The exhaust gas stream 501 to be purified is first fed into the concentration device 520 that increases the concentration of at least one pollutant contained in the exhaust gas stream 501 to be purified by means of a concentration method (e.g., adsorption, absorption or membranes). The desorbate 521 generated by this is subsequently fed into a condensation device 510 that condenses the at least one pollutant and thus removes it from the desorbate 521. Accordingly, a purified exhaust gas stream 502 or 502′ is provided by the concentration device 520 and the condensation device 510, respectively.

[0119] The concentration may be carried out, for example, by means of a bed adsorber or a concentrator wheel (e.g., with zeolite and/or activated carbon).

[0120] Alternatively, the condensation may also be carried out without a previous concentration by the concentration device 520. As indicated in FIG. 5, the exhaust gas stream 501 to be purified may also be directly fed into the condensation device 510. For example, a pollutant of a dryer in the exhaust gas stream 501 to be purified may also be directly condensed by the condensation device 510 (a concentration of the pollutant in the exhaust gas stream 501 to be purified may, for example, be already carried out by a circulation air operation in the dryer itself). Likewise, a condensation of the exhaust gas stream 501 to be purified with a subsequent adsorptive concentration of the residue may be carried out in the condensation device 510 in order to achieve the desired or required maximum pollutant content of the purified exhaust gas stream 502′.

[0121] As may be seen from the preceding explanations, the solvent recovery may be carried out using various approaches that may be chosen depending on the process requirements and the type of pollutant or pollutants, for example.

[0122] The solvents obtained in the condensation device 510 may be subsequently optionally treated in a solvent treatment device 530 and again fed into the production process or the production system 560. According to embodiments, the treatment may also be omitted. Alternatively, the recovered solvents may also be gathered and further processed externally (i.e., they are not directly fed again into the production process or the production system 560). The purified exhaust gas stream or exhaust gas streams 502 and 502′ may be fed into the environment or again fed into the production process or the production system 560.

[0123] Data relating to the individual exhaust gas streams or solvent streams may be collected via one or more sensors 540, 541, 542, 543, 544 or 546. The measurement data of the sensors 540, 541, 542, 543, 544 or 546 are sent as system data to a data cloud 550 by the exhaust gas purification system 500 and analyzed there according to the invention. Furthermore, as indicated in FIG. 5, data of one or more of the sensors 545 and 547 of the industrial production system 560 may also be received by the data cloud 550 and included in the analysis. It is to be noted in this context that the sensors illustrated in FIG. 5 are chosen merely as examples and for illustration purposes. According to embodiments, also more, less or differently placed sensors may be used.

[0124] By means of suitable sensors or the recording of suitable parameters or characteristics, an analysis, evaluation or balancing of the entire system or selected sub-processes may be carried out via the data cloud 550. Since the exhaust air purification is aimed at recovery, a direct coupling of the exhaust gas purification system 500 to the production process is given.

[0125] Like in the preceding embodiments, sensor information may be evaluated or combined before and/or after a process step or a sub-step (volume flow, pressure, temperature, concentration—e.g., LEL concentration, humidity content, etc.) alone or together with information from the respective process in the data cloud 550 in order to determine one or more characterizing quantities of the exhaust gas purification system 500 and provide it for retrieval by a terminal device 570 of a user.

[0126] For the concentration sub-process, a concentration of one or more pollutants in the exhaust gas stream 501 to be purified, in the purified exhaust gas stream 502 or in the desorbate 521, for example, may be determined from the transmitted system data depending on the rotational speed of a adsorption wheel or depending on an inlet temperature of the exhaust gas stream 501 to be purified or the desorption temperature.

[0127] In the condensation sub-process, a switching time for a 2-line-condensation may be determined depending on the operating temperature and the gas properties at the inlet of the condensation device. “2-line” means a redundancy of the aggregates in this connection, as one line always freezes during condensation while the other line thaws. Likewise, indexes on individual condensation stages (e.g., temperatures) may be determined as characterizing quantity depending on the condensate composition. A condensation in several stages means in this connection that various enriched fractions are separated separately such as to facilitate a subsequent treatment. According to some embodiments, a respective pumping power for individual condensation levels for monitoring (balancing) individual fractions (e.g., amount of pumped condensate amount depending on input quantities) may also be determined as the characterizing quantity, for example.

[0128] Likewise, a balancing of the entire system (production and exhaust gas purification=solvent recovery) may be carried out in the data cloud 550 with regard to the solvent use or a tracking of an enrichment of solvents in a procedural step (in order to avoid the risk of condensation). Likewise, an electrical energy input per unit mass of recovered solvent may be determined as characterizing quantity, for example.

[0129] Thus, an automated, efficient and targeted monitoring of the exhaust gas purification system may be carried out.