Methods and apparatus for an exhaust demand control system for measuring one or more contaminants at one or more exhaust locations within one or a plurality of exhaust ducts or plenums served by an exhaust fan system. Example systems and methods can include sensing the one or more contaminants within the one or more exhaust duct locations using a multipoint air sampling system having one or more sensors and flow control elements, comparing contaminant concentration measurements from the one or more of said exhaust duct or plenum locations against an action level to create a fan setback signal, and ensuring sensor accuracy and reliability by implementing a sensor protective mode when the contaminant concentration measurements from the one or more exhaust locations exceeds an action level.

A weldless sample port assembly is provided herein that may be installed on a conduit carrying a fluid such as an exhaust stack, without a requirement for welding. The sample port assembly comprises a sample tube that passes through two holes in the exhaust stack. The sample port assembly further comprises first and second assemblies located at each end of the sample tube and which respectively provide a sealed interface with the two holes in the exhaust stack. At least one assembly of the first and second assemblies is a floating assembly that comprises a compressive body. The compressive body may help to compensate for expansion and contraction of the assembly and/or sample tube, as well as misalignment in the exhaust holes to ensure that the first and second assemblies maintain a positive seal at all times against the exhaust stack and the sample tube.

An emission detection system an enclosed combustion device stack is disclosed. The detection system has a sampling line having a first end exposed to a combusted gas passing through the stack exit port, to receive an undiluted gas sample from the stack exit port. The detection system has an electrostatic particulate matter sensor coupled to a second end of the sampling line, the second end positioned lower than and downstream of the first end, to analyze the undiluted gas sample. The detection system has an exhaust outlet coupled to and downstream of the electrostatic particulate matter sensor, to receive the undiluted gas sample from the electrostatic particulate matter sensor and feed the undiluted gas sample to the primary gas intake line upstream of the enclosed combustion device stack burner.

Provided is a gas analyzer capable of facilitating the treatment of water generated from an analysis target gas and collected in a drain pot. A gas analyzer 10 includes: an analysis target gas flow path 13 through which an analysis target gas flows; a cooling unit 14 which is provided in the analysis target gas flow path 13 and configured to cool the analysis target gas; a drain flow path 141 through which liquid generated in the cooling unit 14 is discharged; a closed container 20 connected to the drain flow path 141; a selective permeation member 211 which is a member partitioning the inside of the closed container 20 into the drain introduction space 200 connected to the drain flow path 141 and a gas introduction space 210 and configured to selectively let gas-phase water permeate from the drain introduction space 200 to the gas introduction space 210; a gas source 22 configured to introduce a gas into the gas introduction space 210; and a gas discharge port 26 through which a gas in the gas introduction space 210 is discharged

Methods and apparatus for an exhaust demand control system for measuring one or more contaminants at one or more exhaust locations within one or a plurality of exhaust ducts or plenums served by an exhaust fan system. Example systems and methods can include sensing the one or more contaminants within the one or more exhaust duct locations using a multipoint air sampling system having one or more sensors and comparing contaminant concentration measurements from the one or more of said exhaust duct or plenum locations against an action level to create a fan setback signal.

A sampling and preparation system is positioned in a coal and biomass co-fired power station, which includes a sampling pipe connected with a boiler flue of the co-fired power station. The sampling pipe from the end close to the boiler flue to the other end away from the boiler flue includes a filtering device, a mass flow controller, a carbon dioxide trap and a pumping device. The sampling and preparation system also includes a carbon dioxide transfer device and a .sup.14C testing device. The carbon dioxide transfer device is applied to transferring the carbon dioxide from the carbon dioxide trap to the .sup.14C testing device which is applied to measuring the .sup.14C in the carbon dioxide sample. The system may calculate the biomass blending ratio of the coal and biomass co-fired power station rapidly.

An on-line measurement system for aerosol precursors emitted from industrial sources has three parts: online measurement part, pipeline cleaning part and automatic control part. The system includes: a particulate filter, high temperature intake pipe, two detergent tanks, an air pump, a cooling water pump, two detergent pumps, a condenser, an impinger, a cooling water meter, a salinity meter, a liquid flow meter, a gas flow meter, nitrogen cylinders, connecting pipes, control valves, computer control program etc. The aerosol precursor concentration Cg emitted from industrial sources is measured in the online measurement section. After every measurement, the pipeline is cleaned by the pipeline cleaning part to remove organic and inorganic residual. The automatic control part is controlled by the computer through a controlling program to control the working process of the system. The system has small area occupation, low investment cost, simple maintenance, convenient transformation and high applicability.

A weldless sample port assembly is provided herein that may be installed on a conduit carrying a fluid such as an exhaust stack, without a requirement for welding. The sample port assembly comprises a sample tube that passes through two holes in the exhaust stack. The sample port assembly further comprises first and second assemblies located at each end of the sample tube and which respectively provide a sealed interface with the two holes in the exhaust stack. At least one assembly of the first and second assemblies is a floating assembly that comprises a compressive body. The compressive body may help to compensate for expansion and contraction of the assembly and/or sample tube, as well as misalignment in the exhaust holes to ensure that the first and second assemblies maintain a positive seal at all times against the exhaust stack and the sample tube.

A gas outlet monitoring system for a boiler system includes a gas probe(s) with a plurality of gas sensing locations wherein each location measures a plurality of parameters of the gas flow, such a oxygen concentration and temperature. The multi-sensor probe includes a tubular lance and a plurality of sensor pods spaced along the lance. Each sensor pod has an oxygen sensor disposed in a first port, and a first temperature sensor disposed in a second port. An enclosure is disposed at one end of the tubular lance. The enclosure has a respective pressure sensor for each oxygen sensor port. A plurality of first tubes passes through the lance between the enclosure and the first port of a respective sensor pod to provide a gas to the respective first port for the purpose of providing cleaning air. A plurality of second tubes passes through the lance between the enclosure and the first port of a respective sensor pod to provide fluid communication between gas in the respective first port and the respective pressure sensor. One pressure sensor is provided for each oxygen sensor.

A combustion analyzer system includes an analyzer unit, a primary analysis probe and one or more remote probes. The analyzer unit includes a condensation removal unit and two or more electrochemical sensors to detect at least oxygen and carbon monoxide. The analyzer unit or the primary analysis probe include a means for condensing and eliminating liquid in the combustion gas to be analyzed.