Disclosed is a urea finishing method including an off-gas treatment, the method comprising urea finishing and supplying the off-gas to a quenching zone and to a scrub column comprising a sump and a venturi stage, wherein the sump has a split sump configuration with two compartments.

Disclosed is a urea finishing method including an off-gas treatment, the method comprising urea finishing and supplying the off-gas to a quenching zone and to a scrub column comprising a sump and a venturi stage, wherein the sump has a split sump configuration with two compartments.

The invention provides a scrubbing column for cleaning gas streams laden with absorbent residues, for example with methanol, and also with solid particles, for example with fuel dust. The gas scrubbing is effected by means of a random packing disposed in the lower region of the scrubbing column and the gas scrubbing of the gas stream laden solely with absorbent residues but not with solid particles by means of a structured packing disposed in the upper region of the scrubbing column. The use of the scrubbing column according to the invention in the integrated plant system between a gasification plant and a plant for gas scrubbing which is operated by the Rectisol process, for example, offers particular advantages with regard to its industrial employability owing to the possible connections described, which bring synergies for efficient operation of the integrated plant system.

The method and system disclosed herein present a purification device for purifying air, and an air purifier having the same. The purification device for purifying air comprises a housing, one or more purification assemblies, one or more water inlet pipes, one or more capture assemblies, and an electric motor. The housing is provided with an air inlet and an air outlet. A cavity, in communication with the air inlet and the air outlet, is defined inside the housing. Each of the one or more purification assemblies is rotatably arranged in the cavity, and is located between the air inlet and the air outlet. Each of the one or more capture assemblies is rotatably arranged at a downstream side of the one or more purification assemblies. The electric motor is used for driving the one or more purification assemblies and the one or more capture assemblies.

An apparatus and a method for washing hydrocarbon product vapor are disclosed. The apparatus comprises housing, a first wash zone at a predefined cross-section of the housing for receiving the hydrocarbon product vapor, a plurality of injection units located within the first wash zone at predetermined intervals of the length of the housing for receiving wash oil. The injection units inject oil droplets formed from the received wash oil to contact the vapor and obtain a primary washed hydrocarbon vapor within the first wash zone. Further, a second wash zone is located above and in fluid communication with the first wash zone for receiving the primary washed hydrocarbon vapor. One or more spray headers receive wash oil and spray oil droplets formed from the received wash oil to contact with the primary washed hydrocarbon vapor, thereby forming a secondary washed hydrocarbon vapor.

An apparatus and a method for washing hydrocarbon product vapor are disclosed. The apparatus comprises housing, a first wash zone at a predefined cross-section of the housing for receiving the hydrocarbon product vapor, a plurality of injection units located within the first wash zone at predetermined intervals of the length of the housing for receiving wash oil. The injection units inject oil droplets formed from the received wash oil to contact the vapor and obtain a primary washed hydrocarbon vapor within the first wash zone. Further, a second wash zone is located above and in fluid communication with the first wash zone for receiving the primary washed hydrocarbon vapor. One or more spray headers receive wash oil and spray oil droplets formed from the received wash oil to contact with the primary washed hydrocarbon vapor, thereby forming a secondary washed hydrocarbon vapor.

There is provided an exhaust gas processing apparatus configured to cause a processing gas to be exposed to or come into contact with a liquid and thereby detoxify the processing gas. The exhaust gas processing apparatus comprises a suction casing provided with an inlet which the processing gas is sucked into and with an outlet which the processing gas is flowed out from; a liquid tank configured to receive an outlet-side part of the suction casing and store the liquid therein; and one or multiple spray nozzles placed in the liquid tank. The outlet of the suction casing is arranged to be located above a liquid surface of the liquid stored in the liquid tank. The one or multiple spray nozzles are configured to spray the liquid from around the outlet of the suction casing to a peripheral part of the outlet.

The present invention provides a dust removal system for a chimney of a mixer. The system includes a dust removal water tank and a first pipeline. One end of the first pipeline is communicated with an outlet of the chimney at a tail of the mixer, and the other end is inserted into the dust removal water tank. A water inlet and a water outlet are provided in the dust removal water tank. An exhaust port for discharging filtered gas is provided in an upper part of the dust removal water tank. The system does not need additional power, and is energy-saving and environmentally friendly. Water vapor discharged facilitates the sedimentation of dust particles in the mixer, thereby reducing loss of raw material mixture, making sintering quality more stable and solving a problem that gas discharged in prior arts contains more powder and pollutes the environment.

The present invention provides a dust removal system for a chimney of a mixer. The system includes a dust removal water tank and a first pipeline. One end of the first pipeline is communicated with an outlet of the chimney at a tail of the mixer, and the other end is inserted into the dust removal water tank. A water inlet and a water outlet are provided in the dust removal water tank. An exhaust port for discharging filtered gas is provided in an upper part of the dust removal water tank. The system does not need additional power, and is energy-saving and environmentally friendly. Water vapor discharged facilitates the sedimentation of dust particles in the mixer, thereby reducing loss of raw material mixture, making sintering quality more stable and solving a problem that gas discharged in prior arts contains more powder and pollutes the environment.

Disclosed is an apparatus for collecting a by-product in a semiconductor manufacturing process, the apparatus including: a heating jacket provided detachably along an outer circumference of a housing unit to provide a uniform temperature in a space into which exhaust gas containing tungsten hexafluoride (WF6) discharged after being used in a semiconductor manufacturing process flows; an upper internal collecting tower having first collecting plates and second collecting plates alternately arranged at regular intervals in a vertical direction to realize sufficient moving path and time in a narrow space; and a lower internal collection tower having third collecting plates arranged at regular intervals in the vertical direction, the third collecting plates having different regions on each surface thereof such that each of the third collecting plates is misaligned with a next third collecting plate to realize sufficient moving path and time in a narrow space.