WO2022083174A1 - 一种烟气中HCl的在线测量系统及方法 - Google Patents

一种烟气中HCl的在线测量系统及方法 Download PDF

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WO2022083174A1
WO2022083174A1 PCT/CN2021/104630 CN2021104630W WO2022083174A1 WO 2022083174 A1 WO2022083174 A1 WO 2022083174A1 CN 2021104630 W CN2021104630 W CN 2021104630W WO 2022083174 A1 WO2022083174 A1 WO 2022083174A1
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hcl
flue gas
liquid
absorber
gas
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PCT/CN2021/104630
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English (en)
French (fr)
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谭增强
牛国平
周梦伟
徐梦茜
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西安西热锅炉环保工程有限公司
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Publication of WO2022083174A1 publication Critical patent/WO2022083174A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0006—Calibrating gas analysers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/204—Inorganic halogen compounds
    • B01D2257/2045—Hydrochloric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
    • G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N2033/0019—Sample conditioning by preconcentration

Definitions

  • the invention relates to an acid gas measurement system, in particular to an on-line measurement system and method of HCl in flue gas, which is suitable for coal-fired power plants, glass furnaces, waste incineration plants, biomass power plants, coking industry, cement industry, On-line measurement of HCl in non-ferrous metal smelting, HCl production plants, etc.
  • More than 90% of Chinese coal is low-chlorine coal, and its content is generally 0.01% to 0.05%.
  • the chlorine content in coal and its form in coal are related to the coal formation process and formation conditions.
  • the main forms of chlorine in coal are inorganic chlorides and organic chlorides. In general, the concentration range of chlorine in plants is 0.2% to 2.0%.
  • Municipal solid waste contains a certain amount of PVC and NaCl. During incineration, coal, biomass and solid waste will release a certain amount of hydrogen chloride.
  • Hydrogen chloride is a colorless gas with a pungent odor.
  • the aqueous solution of hydrogen chloride is hydrochloric acid, and pure hydrochloric acid is a colorless liquid.
  • the hazards of hydrogen chloride are mainly caused by acid rain, corrosion and the formation of dioxins.
  • Hydrogen chloride emissions are the third largest source of acid rain formation globally (the top two are SO2 and NOx). Because hydrogen chloride is very soluble in rainwater, compared with the first two, hydrogen chloride is a local pollution source and is basically discharged near the release source. Acid rain is a serious environmental problem that my country is currently facing.
  • Hydrogen chloride can also cause corrosion to boiler equipment. Corrosion is the chemical damage caused by flue gas and ash particles emitted from the furnace. The most severely corroded boiler components are the combustion chamber, the first void of the water wall, and the superheater. Hydrogen chloride is also a source of dioxin formation in waste incineration.
  • the existing HCl measurement methods are all offline monitoring methods, that is, sampling first, and then offline analysis of the collected samples in the laboratory.
  • the sampling and testing time of this method is long, and the HCl concentration in the flue gas cannot be monitored for a long time.
  • the present invention provides an on-line measurement system and method for HCl in flue gas, which has reasonable design, convenient use, accurate measurement, and can realize real-time monitoring of HCl concentration.
  • An on-line measurement system for HCl in flue gas comprising a sampling system, an HCl absorber, an HCl quantitative device, a liquid supply system and a measurement control system; the sampling system, the HCl absorber, the HCl quantitative device and the liquid supply system are all connected with the measurement control system Connected, wherein the sampling system is connected with the gas inlet of the HCl absorber, the liquid supply system is connected with the liquid inlet of the HCl absorber, the gas outlet of the HCl absorber is connected with the air pump, and the liquid outlet of the HCl absorber is connected with the HCl quantizer through the second peristaltic pump ; A chloride ion detector is arranged in the HCl quantifier.
  • a further improvement of the present invention is that the gas outlet of the HCl absorber is connected to the gas flowmeter through an oxygen detector, an air pump, and a wet flowmeter.
  • a further improvement of the present invention is that the HCl absorber is a packed tower.
  • sampling system includes a sampling gun, a pre-filter and a thermocouple, wherein a pre-filter is arranged at the inlet of the sampling gun, and a thermocouple is arranged on one side of the sampling gun.
  • sampling gun has a built-in quartz tube or glass tube, the sampling gun is provided with a heat tracing system, and the outlet of the sampling gun is connected to the HCl absorber through a fine dust filter.
  • a further improvement of the present invention is that the fine dust filter is arranged in the first temperature control box with a temperature of 130-180°C; the HCl quantifier is arranged in a third temperature control box with a temperature of 15-25°C; the second peristalsis
  • the pump is connected with the HCl quantitative device through the third liquid flow meter, and a liquid level gauge is arranged in the HCl quantitative device, and the sampling gun is also connected with the compressed air backflushing system.
  • a further improvement of the present invention lies in that the liquid supply system includes an absorption liquid tank, an electric regulating valve, a first peristaltic pump and a first liquid flow meter, the absorption liquid tank is equipped with demineralized water, and the outlet of the absorption liquid tank passes through the electric regulating valve, the first peristaltic pump and the first liquid flow meter.
  • the peristaltic pump and the first liquid flow meter are connected to the HCl absorber.
  • the sample gas enters the HCl absorber from the sampling system, the demineralized water in the liquid supply system enters the HCl absorber, and the HCl in the sample gas is absorbed in the HCl absorber.
  • the captured sample liquid enters the chloride ion detector through the second peristaltic pump, measures the Cl - concentration in the water, and sends the Cl - concentration data to the measurement control system, and calculates the HCl concentration in the flue gas according to the following formula C HCl, flue gas :
  • C HCl flue gas is the concentration of HCl in flue gas
  • Q V liquid is the flow rate of absorption liquid
  • C Cl liquid is the mass concentration of chloride ions
  • Q V flue gas is the volume flow of flue gas.
  • a further improvement of the present invention is that the sample gas in the HCl absorber is discharged through an oxygen detector, an air pump, a wet flowmeter and a gas flowmeter.
  • the present invention has the following beneficial effects: the flue gas collected by the sampling system in the present invention is transported to the HCl absorber to absorb the HCl in the flue gas, and the liquid absorbing HCl is transported to the chloride ion through the second peristaltic pump.
  • the detector detects chloride ions, so as to realize the real-time monitoring of the HCl concentration in the flue gas and reflect the HCl concentration in the exhaust flue gas in real time.
  • an HCl absorber is arranged, and water is used in the HCl absorber to absorb the HCl in the flue gas, and then the absorbed liquid is sent to the HCl quantitative device through a peristaltic pump.
  • the HCl concentration in the flue gas can be measured every minute, and the data is more representative.
  • the present invention adopts the chemical absorption method for flue gas sampling by setting up an HCl absorber, and by setting a pre-filter at the inlet of the sampling gun, the interference of dust in the flue gas can be avoided, the accurate sampling of HCl can be realized, and the measurement of HCl concentration can be improved. the precision of the results.
  • the sampling gun is provided with a heat tracing system to ensure that the temperature of the flue gas is higher than 120 °C, which is suitable for different environments, can realize online measurement, and can ensure the accuracy of the measurement.
  • demineralized water as the absorbing liquid in the present invention, demineralized water can be easily obtained for the power plant, and it can be used in the testing system of the present invention only by connecting the existing demineralized water pipeline.
  • high-pressure nitrogen or compressed air provided by the power plant is connected to the main gas path as the purging gas, and the pre-filter can be back-flushed through the compressed air back-flushing system, so as to realize the cleaning of the pre-filter. Dust removal and cleaning extend the maintenance cycle of the device.
  • the invention continuously transfers the gaseous HCl in the flue gas into the aqueous solution, and uses the chloride ion detector to measure the chloride ion concentration in the aqueous solution, and simultaneously uses the wet flowmeter and the liquid flowmeter to measure the extraction flow and the water flow,
  • the HCl concentration in the flue gas is calculated to achieve online measurement while ensuring the accuracy of the measurement.
  • FIG. 1 is a schematic structural diagram of the present invention.
  • a layer/element when referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present therebetween. element.
  • a layer/element when a layer/element is “on” another layer/element in one orientation, then when the orientation is reversed, the layer/element can be "under” the other layer/element.
  • an online measurement system of HCl in flue gas includes sampling system, liquid supply system, first temperature control box 4, second temperature control box 10, third temperature control box 26, HCl absorber 9, HCl Quantitator 25, chloride ion detector 24, wet flowmeter 13, air pump 12, first liquid flowmeter 18, second liquid flowmeter 19, third liquid flowmeter 22, gas flowmeter 14, first peristaltic pump 17 , the second peristaltic pump 21 , the waste liquid storage tank 27 , the oxygen detector 11 , the measurement control system, the calibration system and the backflushing system 5 .
  • the sampling system, the HCl absorber 9, the HCl quantizer 25 and the liquid supply system are all connected with the measurement control system,
  • the sampling system consists of sampling gun 2, pre-filter 1, heat tracing system and thermocouple.
  • the inlet of the sampling gun 2 is provided with a pre-filter 1, which can pre-dust the dust-containing sample gas.
  • the pre-filter 1 can be made of but not limited to alumina or silicon carbide, with a filtration accuracy of 0.5 ⁇ m to 3 ⁇ m, and an operating temperature of -50 °C ⁇ 450°C, the resistance is less than 2kPa.
  • the selection of the shell material of the sampling gun 2 depends on the material stability at the flue gas temperature where the sampling system is located, and can be made of but not limited to stainless steel, carbon steel, alloy materials, etc.
  • the sampling gun 2 has a built-in quartz tube or glass tube.
  • thermocouple is provided on one side of the sampling gun 2 .
  • the thermocouple can monitor the temperature of the environment where the sampling gun 2 is located in real time. When the temperature of the extracted flue gas is above 120°C, the sampling gun 2 does not need heat tracing; when the temperature of the extracted flue gas is lower than 120°C, a heat tracing system is installed on the sampling gun 2 to ensure that the flue gas temperature is higher than 120°C.
  • the pre-filter by connecting high-pressure nitrogen or the power plant's own compressed air as the purging gas on the main gas path, the pre-filter can be back-blown through the compressed air back-flushing system 5, so as to realize the removal of the pre-filter. Ash cleaning.
  • a fine dust filter 3 Downstream of the sampling system, that is, on the pipeline at the outlet of the sampling gun 2, a fine dust filter 3 can be set to dedust and purify the flue gas for the second time.
  • the fine dust filter 3 is provided in the first temperature control box.
  • a chloride ion detector is arranged in the third temperature control box, and the temperature in the third temperature control box is controlled within a temperature range of 15-25°C.
  • the sampling system In the working conditions where dust will interfere with the HCl test, such as the working conditions with high dust and water content in the flue gas, the sampling system needs to adopt the form of isokinetic sampling; it needs to be based on flue gas flow rate, flue gas temperature, flue gas humidity. , flue gas static pressure, etc. to determine the size of the sampling nozzle and the flow rate of the suction pump, and finally achieve the purpose of isokinetic tracking sampling.
  • the sample gas enters the fine dust filter 3 from the sampling system for further filtration and dust removal, and then enters the HCl absorber 9 to remove HCl. After the sample gas is discharged from the HCl absorber 9, it finally passes through the oxygen detector 11, the air pump 12, and the wet flow meter 13. , the gas flow meter 14 is discharged into the atmosphere.
  • the wet flow meter 13 can be arranged at the inlet of the air pump 12 or at the outlet of the air pump 12 .
  • the function of the suction pump 12 is to provide the pressure head required for flue gas sampling, and to stably extract a certain flow of flue gas.
  • the wet flow meter 13 can run stably with an accuracy of not less than 1% of the indicated value; the wet flow meter 13 can display the volume of gas extracted by the air pump, and the gas volume can be transmitted to the measurement control system.
  • the oxygen detector 11 can be, but is not limited to, a thermal magnetic oxygen analyzer and a zirconia sensor oxygen analyzer.
  • the sample gas transfer line connecting the sampling system, the fine dust filter to the inlet of the HCl absorber requires heat tracing to avoid condensation.
  • the heat tracing temperature of the sample gas transmission pipeline can be controlled at 120 ⁇ 180°C.
  • the HCl absorber 9 needs to achieve complete absorption of HCl in the sample gas, and the HCl absorber 9 can be in the form of, but not limited to, a packed column.
  • the temperature of the first temperature control box 4 is controlled at 130-180° C., and a fine dust filter 3 is arranged in the first temperature control box 4 , and the dust removal efficiency of the fine dust filter is above 99%.
  • the second temperature control box 10 can adopt but is not limited to the semiconductor refrigeration principle.
  • the temperature in the second temperature control box 10 is controlled at 2-6° C., and the HCl absorber 9 is arranged in the box.
  • the refrigeration system of the second temperature control box 10 can realize smoke The rapid cooling of the gas is conducive to the complete capture of HCl in the flue gas.
  • the HCl quantifier 25 is arranged in the third temperature control box 26, and the temperature in the third temperature control box 26 is controlled within the optimum working temperature range of the chloride ion detector 24, specifically 15-25°C.
  • the liquid supply system consists of an absorption liquid tank 15 , an electric regulating valve 16 , a first peristaltic pump 17 and a first liquid flow meter 18 .
  • the absorption liquid tank 15 is equipped with demineralized water, and the liquid supply system can stably supply demineralized water at a set flow rate.
  • the measurement error of the liquid flow meter needs to be within 1%.
  • the demineralized water from the liquid supply system enters the HCl absorber 9 at a certain flow rate, the moist and hot sample gas enters the HCl absorber 9, and the HCl in the sample gas is captured in the HCl absorber 9.
  • a certain flow of sample liquid passes through the second peristaltic pump 21 and the third liquid flow meter 22 and enters the HCl quantitative device 25 , the remaining liquid enters the waste liquid storage tank 27 , and the liquid discharged from the HCl quantitative device 25 also enters the waste liquid storage tank 27 .
  • a liquid level meter 23 and a chloride ion detector 24 are arranged in the HCl quantizer 25, and the flow rate of the sample liquid can be determined in real time according to the indication of the liquid level meter and the parameters set by the peristaltic pump.
  • the chloride ion detector 24 can continuously and stably measure the Cl - concentration in water, the reaction time is less than 1min, and the sample gas transmission path and the liquid transmission and transfer time are less than 1min.
  • the resistance gradually increases, and after the resistance reaches a certain level, the compressed air backflushing system 5 is used to clean it.
  • the calibration system is composed of HCl standard gas 6 , pressure reducing valve 7 and flow meter 8 .
  • the HCl standard gas 6 is connected to the HCl absorber 9 through the pressure reducing valve 7 and the flow meter 8 .
  • the calibration system can also be used to continuously mix high-purity hydrogen chloride and nitrogen (or air) according to the required flow ratio. Periodically calibrate the test system using the calibration system.
  • the measurement control system is used to realize analog signal acquisition and status signal collection, data calculation, data display, data storage and retrieval, data output, data remote networking, etc.
  • the first temperature control box 4 the backflushing system 5
  • the second temperature control box 10 the oxygen detector 11
  • the air pump 12 Wet flowmeter 13, gas flowmeter 14, electric regulating valve 16, first peristaltic pump 17, first liquid flowmeter 18, second liquid flowmeter 19, second peristaltic pump 21, third liquid flowmeter 22, Liquid level gauge 23 , chloride ion detector 34 , third temperature control box 26 .
  • the gas flow meter 14 and the wet flow meter 13 monitor the volume flow of flue gas Q v, flue gas at the outlet of the extraction pump in real time, and transmit the volume flow Q v of flue gas, flue gas to the measurement control system;
  • the oxygen detector 11 monitors the extraction pump in real time
  • the volume concentration of oxygen in the flue gas at the outlet C O2, flue gas , and the volume concentration of oxygen C O2, flue gas is transmitted to the measurement control system;
  • the chloride ion detector 24 monitors the mass concentration of chloride ions in the absorption liquid C Cl in real time , liquid , and the mass concentration of chloride ions C Cl, liquid is transmitted to the measurement control system;
  • the liquid flow meter monitors the absorption liquid flow Q V, liquid in real time, and transmits the absorption liquid flow Q V, liquid to the measurement control system.
  • the measurement and control system calculates the HCl concentration C HCl in the flue gas according to the volume flow of flue gas Q V, the mass concentration of flue gas and chloride ions C Cl, the flow rate of liquid and absorption liquid Q V, and the liquid , and the flue gas:
  • C HCl flue gas is the concentration of HCl in flue gas, mg/m 3 ;
  • Q V liquid is the flow rate of absorption liquid, L/h;
  • C Cl liquid is the mass concentration of chloride ions, mg/L;
  • Q V Flue gas is the volume flow of flue gas, standard state, wet basis, m 3 /h.
  • HCl concentration C HCl in the flue gas it is also possible to convert the HCl concentration C HCl in the flue gas to the HCl concentration under a certain oxygen reference concentration, such as the HCl concentration under 6% oxygen reference concentration, according to the volume concentration of oxygen C O2 .
  • the measurement principle is to continuously transfer the gaseous HCl in the flue gas into the aqueous solution, and use the chloride ion detector to measure the chloride ion concentration in the aqueous solution, and use the wet flowmeter and liquid flowmeter to measure the extraction flow and water flow. Calculate the HCl concentration in the flue gas.
  • the whole device calculates, displays, controls and transmits data through the measurement control system.
  • the flue gas passes through the pre-filter 1 at the top of the sampling gun 2 to pre-dust the dusty sample gas.
  • the sampling gun does not need to be heated; when the extracted flue gas temperature is lower than When the temperature is 120°C, the sampling gun is equipped with a heat tracing system to ensure that the temperature of the flue gas is higher than 120°C; in the case of high dust and water content in the flue gas, the sampling system needs to adopt the form of isokinetic sampling.
  • the sample gas enters the fine dust filter 3 from the sampling system for further filtration and dust removal, the demineralized water from the liquid supply system enters the HCl absorber 9 at a certain flow rate, the moist and hot sample gas enters the HCl absorber 9, and the HCl in the sample gas is in the HCl absorber 9. trapped in the absorber 9 .
  • the sample liquid of a certain flow enters the HCl quantitative device 25 through the second peristaltic pump 21 and the third liquid flow meter 22, and the liquid level meter 23 and the chloride ion detector 24 are arranged in the HCl quantitative device 25.
  • the chloride ion detector 24 can Continuous and stable measurement of Cl - concentration in water.
  • the calibration system is composed of HCl calibration gas 6, pressure reducing valve 7, and flow meter 8.
  • the calibration system is used to calibrate the test system on a regular basis.
  • the measurement control system realizes analog signal acquisition and status signal collection, data calculation, data display, data storage and retrieval, data output, data remote networking, etc.; the measurement control system is based on Q v, flue gas , C Cl, liquid , Q V , Calculate the flue gas HCl concentration C HCl corresponding to the actual oxygen concentration, flue gas :
  • the HCl absorber 9 in the HCl absorber 9, water is used to absorb the HCl in the flue gas, and then the absorbed liquid is sent to the HCl quantitative device 25 through a peristaltic pump. Bubbling phenomenon, in the present invention, after the absorption liquid is sent into the HCl quantitative device 25 by the second peristaltic pump, there is no bubble in the HCl quantitative device 25, only the content of chlorine in the absorption liquid of the HCl quantitative device 25 is measured to ensure the accuracy of the measurement sex.
  • demineralized water as the absorbing liquid, it is easy for the power plant to obtain demineralized water, and it can be used in the testing system of the present invention only by connecting the existing demineralized water pipeline.
  • the terms “arranged”, “connected”, “entered”, “connected” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified
  • the specific meanings of the above terms in the present invention can be understood according to specific situations.

Abstract

一种烟气中HCl的在线测量系统及方法，包括取样系统（1,2）、供液系统（15,16,17,18）、第一温度控制箱（4）、第二温度控制箱（10）、第三温度控制箱（26）、HCl吸收器（9）、HCl定量器（25）、氯离子检测仪（24）、湿式流量计（13）、抽气泵（12）、液体流量计（18,19,22）、气体流量计（14）、蠕动泵（17,21）、废液储罐（27）、氧气检测仪（11）、测量控制系统、标定系统（6,7,8）、反吹系统（5）；其中，取样系统（1,2）与HCl吸收器（9）气体入口相连，供液系统（15,16,17,18）与HCl吸收器（9）液体入口相连，HCl吸收器（9）气体出口与抽气泵（12）相连，HCl吸收器（9）液体出口经第二蠕动泵（21）与HCl定量器（25）相连；HCl定量器（25）中布置有氯离子检测仪（24）。该在线测量系统及方法可以测量每分钟烟气中HCl的浓度，数据更具有代表性。

Description

一种烟气中HCl的在线测量系统及方法 【技术领域】
本发明涉及一种酸性气体的测量系统，具体涉及一种烟气中HCl的在线测量系统及方法，适用于燃煤电厂、玻璃窑炉、垃圾焚烧厂、生物质电厂、焦化行业、水泥行业、有色金属冶炼、HCl生产厂等的HCl的在线测量。
【背景技术】
90％以上的中国煤是低氯煤，含量一般在0.01％～0.05％。煤中的氯含量及其在煤中的存在形式与煤的形成过程和形成条件有关。氯在煤中主要的存在形式是无机氯化物和有机氯化物。一般情况，植物体内的氯的浓度范围是0.2％～2.0％。城市固体废弃物中含有一定量的PVC和NaCl。在焚烧时，煤炭、生物质、固体废弃物将会释放一定量的氯化氢。
氯化氢是无色而有刺激性气味的气体。氯化氢水溶液为盐酸，纯盐酸为无色液体，在空气中冒雾(由于盐酸有强挥发性)，有刺鼻酸味。氯化氢的危害主要为引发酸雨、腐蚀和生成二噁英。氯化氢的排放是全球酸雨形成的第三大来源(前两位是SO 2和NOx)。因为氯化氢极易溶于雨水，所以与前两位相比，氯化氢是一个当地污染源，基本上都会在释放源附近排放。酸雨是我国现阶段正在面临的严重环境问题。氯化氢还会对锅炉设备造成腐蚀。腐蚀是由炉膛排出的烟气和灰颗粒造成的化学破坏。腐蚀最为严重的锅炉部件为焚烧腔、水冷壁的第一个空层以及过热器。氯化氢还是垃圾焚烧中二噁英生成的来源。
现有的HCl测量方法都是离线监测法，即先采样，再到实验室对采集样品进行离线分析，该方法的采样、测试时间长，无法长时间监测烟气中的HCl浓度。
【发明内容】
针对现有技术中存在的问题，本发明提供一种烟气中HCl的在线测量系统及方法，设计合理，使用方便，测量准确，能够实现对HCl浓度的实时监测。
为实现上述目的，本发明采用的技术方案如下：
一种烟气中HCl的在线测量系统，包括取样系统、HCl吸收器、HCl定量器、供液系统和测量控制系统；取样系统、HCl吸收器、HCl定量器以及供液系统均与测量控制系统相连，其中，取样系统与HCl吸收器气体入口相连，供液系统与HCl吸收器液体入口相连，HCl吸收器气体出口与抽气泵相连，HCl吸收器液体出口经第二蠕动泵与HCl定量器相连；HCl定量器中布置有氯离子检测仪。
本发明进一步的改进在于，HCl吸收器气体出口经氧气检测仪、抽气泵、湿式流量计与气体流量计相连。
本发明进一步的改进在于，HCl吸收器为填料塔。
本发明进一步的改进在于，取样系统包括取样枪、前置过滤器与热电偶，其中，取样枪入口设置前置过滤器，取样枪一侧设置有热电偶。
本发明进一步的改进在于，取样枪内置石英管或玻璃管，取样枪上设置有伴热系统，取样枪出口经细粉尘过滤器与HCl吸收器相连。
本发明进一步的改进在于，细粉尘过滤器设置在温度为130～180℃的第一温度控制箱内；HCl定量器设置在温度为15～25℃的第三温度控制箱内内；第二蠕动泵经第三液体流量计与HCl定量器相连，HCl定量器中布置有液位计，取样枪还与压缩空气反吹系统相连。
本发明进一步的改进在于，供液系统包括吸收液箱、电动调节阀、第一蠕动泵与第一液体流量计，吸收液箱中装有除盐水，吸收液箱出口经电动调节阀、第 一蠕动泵、第一液体流量计与HCl吸收器相连。
一种基于上述的系统的烟气中HCl的在线测量方法，样品气体从取样系统进入HCl吸收器，供液系统中的除盐水进入HCl吸收器中，样品气体中的HCl在HCl吸收器中被捕集后的样品液体经过第二蠕动泵进入氯离子检测仪，测量水中Cl -浓度，并将Cl -浓度数据发送给测量控制系统，根据下式计算烟气中HCl浓度C HCl,烟气：
C HCl,烟气＝1.028*(Q V,液*C Cl,液体)/Q V,烟气         (1)
式中：C HCl,烟气为烟气中HCl浓度；Q V,液为吸收液流量；C Cl,液体为氯离子的质量浓度；Q V,烟气为烟气体积流量。度；
Q v,烟气：烟气体积流量。
本发明进一步的改进在于，HCl吸收器中的样品气体经过氧气检测仪、抽气泵、湿式流量计与气体流量计排出。
与现有技术相比，本发明具有以下有益效果：本发明中取样系统采集的烟气输送到HCl吸收器中吸收烟气中的HCl，将吸收HCl的液体经第二蠕动泵输送到氯离子检测仪进行检测氯离子，从而实现对烟气中HCl浓度的实时监测，实时反映排放烟气中的HCl浓度。本发明中通过设置HCl吸收器，在HCl吸收器中采用水吸收烟气中的HCl，然后将吸收后的吸收液通过蠕动泵送入HCl定量器，由于在HCl吸收器中存在鼓泡现象，本发明中吸收液通过蠕动泵送入HCl定量器后，HCl定量器中无气泡，仅测量HCl定量器的吸收液中的氯的含量，保证测量的准确性。并且本发明中可以每分钟的烟气中HCl浓度的测量，数据更具有代表性。
进一步的，本发明通过设置HCl吸收器，中采用化学吸收法进行烟气采样， 通过在取样枪入口设置前置过滤器，可以避免烟气中粉尘的干扰，实现HCl精准采样，提高HCl浓度测量结果的精确度。
进一步的，取样枪上设置有伴热系统，保证烟气温度高于120℃，适用于不同的环境，能够实现在线测量，并能够保证测量的准确性。
进一步的，本发明中通过除盐水作为吸收液，对于电厂来说除盐水很容易得到，只需要连接已有的除盐水管路就可以用于本发明中的测试系统。
进一步的，在本发明中通过主气路上接入高压氮气或电厂自备压缩空气作为吹扫气，通过压缩空气反吹系统可以对前置过滤器进行反吹，从而实现对前置过滤器的除灰清理，延长了装置保养周期。
本发明通过将烟气中的气态HCl连续地转移到水溶液中，并采用氯离子检测仪测量得出水溶液中的氯离子浓度，同时利用湿式流量计、液体流量计测量抽气流量和水流量，计算得到烟气中HCl浓度，实现在线测量的同时，保证测量的准确性。
【附图说明】
图1为本发明的结构示意图。
图中，1-前置过滤器，2-取样枪，3-细粉尘过滤器，4-第一温度控制箱，5-反吹系统，6-HCl标气，7-减压阀，8-流量计，9-HCl吸收器，10-第二温度控制箱，11-氧气检测仪，12-抽气泵，13-湿式流量计，14-气体流量计，15-吸收液箱，16-电动调节阀，17-第一蠕动泵，18-第一液体流量计，19-第二液体流量计，20-三通阀，21-第二蠕动泵，22-第三液体流量计，23-液位计，24-氯离子检测仪，25-HCl定量器，26-第三温度控制箱，27-废液储罐。
【具体实施方式】
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，不是全部的实施例，而并非要限制本发明公开的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要的混淆本发明公开的概念。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
在附图中示出了根据本发明公开实施例的各种结构示意图。这些图并非是按比例绘制的，其中为了清楚表达的目的，放大了某些细节，并且可能省略了某些细节。图中所示出的各种区域、层的形状及它们之间的相对大小、位置关系仅是示例性的，实际中可能由于制造公差或技术限制而有所偏差，并且本领域技术人员根据实际所需可以另外设计具有不同形状、大小、相对位置的区域/层。
本发明公开的上下文中，当将一层/元件称作位于另一层/元件“上”时，该层/元件可以直接位于该另一层/元件上，或者它们之间可以存在居中层/元件。另外，如果在一种朝向中一层/元件位于另一层/元件“上”，那么当调转朝向时，该层/元件可以位于该另一层/元件“下”。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或 单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
下面结合附图对本发明做进一步详细描述：
参见图1，一种烟气中HCl的在线测量系统，包括取样系统、供液系统、第一温度控制箱4、第二温度控制箱10、第三温度控制箱26、HCl吸收器9、HCl定量器25、氯离子检测仪24、湿式流量计13、抽气泵12、第一液体流量计18、第二液体流量计19、第三液体流量计22、气体流量计14、第一蠕动泵17、第二蠕动泵21、废液储罐27、氧气检测仪11、测量控制系统、标定系统和反吹系统5。取样系统、HCl吸收器9、HCl定量器25以及供液系统均与测量控制系统相连，
取样系统由取样枪2、前置过滤器1、伴热系统与热电偶组成。取样枪2入口设置有前置过滤器1，可将含尘样气进行预除尘，前置过滤器1可采用但不限于氧化铝或碳化硅材质，过滤精度0.5μm～3μm，使用温度-50℃～450℃，阻力小于2kPa。取样枪2外壳材质的选取取决于取样系统所处烟气温度下的材料稳定性，可以采用但不限于不锈钢、碳钢、合金材料等，取样枪2内置石英管或玻璃管。取样枪2一侧设置有热电偶。热电偶可实时监测取样枪2所处环境的温度。抽取的烟气温度在120℃以上时，取样枪2不需要伴热；当抽取的烟气温度低于120℃时，取样枪2上设置有伴热系统，保证烟气温度高于120℃。
在本发明中通过主气路上通过接入高压氮气或电厂自备压缩空气作为吹扫气，通过压缩空气反吹系统5可以对前置过滤器进行反吹，从而实现对前置过滤器的除灰清理。
在取样系统下游，即在取样枪2出口的管路上可设置细粉尘过滤器3，对烟气二次除尘净化。细粉尘过滤器3设置在第一温度控制箱内。
第三温度控制箱内布置氯离子检测仪，第三温度控制箱内温度控制在15～25℃温度范围内。
粉尘对HCl测试会产生一定干扰的工况下，如烟气中粉尘和水含量较高的工况，取样系统需要采用等速取样的形式；需要根据烟气流速、烟气温度、烟气湿度、烟气静压等确定采样嘴尺寸和抽气泵流量，最终实现等速跟踪采样的目的。
样品气体从取样系统进入细粉尘过滤器3进一步过滤除尘，然后进入HCl吸收器9脱掉HCl，样品气体从HCl吸收器9排出后，最后经过氧气检测仪11、抽气泵12、湿式流量计13、气体流量计14排到大气中。湿式流量计13可布置在抽气泵12入口，也可布置在抽气泵12出口。抽气泵12作用是提供烟气采样所需的压头，稳定地抽取一定流量的烟气。湿式流量计13可稳定运行，精度不低于1％示值；湿式流量计13可显示抽气泵抽取的气体体积，气体体积可传输至测量控制系统。氧气检测仪11可以采用但不限于热磁式氧分析仪、氧化锆传感器式氧分析仪。
连接取样系统、细粉尘过滤器一直到HCl吸收器入口的样气传输管路，都需要伴热，以避免水汽凝结。样气传输管路的伴热温度可控制在120～180℃。
HCl吸收器9需要实现完全吸收样品气体中的HCl，HCl吸收器9可以采用但不限于填料塔的形式。
第一温度控制箱4的温度控制在130～180℃，第一温度控制箱4内布置细粉尘过滤器3，细粉尘过滤器的粉尘脱除效率在99％以上。
第二温度控制箱10可采用但不限于半导体制冷原理，第二温度控制箱10内 温度控制在2～6℃，箱内布置HCl吸收器9，第二温度控制箱10的制冷系统可实现烟气快速降温，利于烟气中的HCl完全捕集。
第三温度控制箱26内布置HCl定量器25，第三温度控制箱26内温度控制在氯离子检测仪24的最佳工作温度范围内，具体为15～25℃。
供液系统由吸收液箱15、电动调节阀16、第一蠕动泵17与第一液体流量计18组成。吸收液箱15中装有除盐水，供液系统可稳定供应设定流速下的除盐水。液体流量计的测量误差需要达到1％以内。
来自供液系统的除盐水按一定流量进入HCl吸收器9，湿热的样品气体进入HCl吸收器9，样气中的HCl在HCl吸收器9中被捕集。一定流量的样品液体经过第二蠕动泵21、第三液体流量计22，进入HCl定量器25，剩余的液体进入废液储罐27，HCl定量器25排出的液体也进入废液储罐27。HCl定量器25中布置液位计23和氯离子检测仪24，根据液位计示数和蠕动泵设置的参数，可实时确定样品液体的流量。氯离子检测仪24能连续、稳定测量水中Cl -浓度，反应时间小于1min，样气传输通路、液体传输转移时间小于1min。
烟气采样枪中的过滤器运行一定时间后，阻力逐步增大，阻力到一定程度后用压缩空气反吹系统5清扫。
标定系统由HCl标气6、减压阀7与流量计8组成，HCl标气6经减压阀7、流量计8与HCl吸收器9相连。标定系统也可以采用将高纯氯化氢和氮气(或空气)按需要的流量比例进行连续混合。定期采用标定系统对测试系统进行标定。
测量控制系统用于实现模拟信号采集和状态信号收集、数据计算、数据显示、数据存储和检索、数据输出、数据远程联网等。
对于以下部件，可根据具体现场情况，全部或者选出其中几种部件与测量控 制系统相连：第一温度控制箱4、反吹系统5、第二温度控制箱10、氧气检测仪11、抽气泵12、湿式流量计13、气体流量计14、电动调节阀16、第一蠕动泵17、第一液体流量计18、第二液体流量计19、第二蠕动泵21、第三液体流量计22、液位计23、氯离子检测仪34、第三温度控制箱26。
气体流量计14与湿式流量计13实时监测抽气泵出口的烟气体积流量Q v,烟气，并将烟气体积流量Q v,烟气传输至测量控制系统；氧气检测仪11实时监测抽气泵出口处烟气中氧气的体积浓度C O2,烟气，并将氧气的体积浓度C O2,烟气传输至测量控制系统中；氯离子检测仪24实时监测吸收液中氯离子的质量浓度C Cl,液体，并将氯离子的质量浓度C Cl,液体传输至测量控制系统中；液体流量计实时监测吸收液流量Q V, 液，并将吸收液流量Q V,液传输至测量控制系统中。
测量控制系统根据烟气体积流量Q V,烟气、氯离子的质量浓度C Cl,液体、吸收液流量Q V,液计算烟气中HCl浓度C HCl,烟气：
C HCl,烟气＝1.028*(Q V,液*C Cl,液体)/Q V,烟气      (1)
式中：C HCl,烟气为烟气中HCl浓度，mg/m 3；Q V,液为吸收液流量，L/h；C Cl,液体为氯离子的质量浓度，mg/L；Q V,烟气为烟气体积流量，标态、湿基，m 3/h。
也可以根据氧气的体积浓度C O2,烟气将烟气中HCl浓度C HCl,烟气折算到某氧气基准浓度下的HCl浓度，如6％氧气基准浓度下的HCl浓度。
测量原理是将烟气中的气态HCl连续地转移到水溶液中，并采用氯离子检测仪测量得出水溶液中的氯离子浓度，同时利用湿式流量计、液体流量计测量抽气流量和水流量，计算得到烟气中HCl浓度。整套装置通过测量控制系统计算、显示、控制和传输数据。
一种基于上述系统的烟气中HCl的在线测量方法，包括以下步骤：
1)烟气通过取样枪2顶部的前置过滤器1将含尘样气进行预除尘，抽取的烟气温度在120℃以上时，取样枪不需要伴热；当抽取的烟气温度低于120℃时，取样枪设置伴热系统，保证烟气温度高于120℃；如烟气中粉尘和水含量较高的工况，取样系统需要采用等速取样的形式。
2)样品气体从取样系统进入细粉尘过滤器3进一步过滤除尘，来自供液系统的除盐水按一定流量进入HCl吸收器9，湿热的样品气体进入HCl吸收器9，样气中的HCl在HCl吸收器9中被捕集。
3)一定流量的样品液体经过第二蠕动泵21、第三液体流量计22，进入HCl定量器25，HCl定量器25中布置液位计23和氯离子检测仪24，氯离子检测仪24能连续、稳定测量水中Cl -浓度。
4)样品气体从HCl吸收器9排出后，最后经过氧气检测仪11、抽气泵12、湿式流量计13、气体流量计14排到大气中。
5)烟气采样枪中的过滤器运行一定时间后，阻力逐步增大，阻力到一定程度后用压缩空气反吹系统5清扫。
6)标定系统由HCl标气6、减压阀7、流量计8组成，定期采用标定系统对测试系统进行标定。
7)测量控制系统实现模拟信号采集和状态信号收集、数据计算、数据显示、数据存储和检索、数据输出、数据远程联网等；测量控制系统根据Q v,烟气、C Cl,液体、Q V,液计算实际氧浓度对应的烟气HCl浓度C HCl,烟气：
C HCl,烟气＝1.028*(Q V,液*C Cl,液体)/Q V,烟气
也可以根据C O2,烟气将C HCl,烟气折算到某氧气基准浓度下的HCl浓度，如6％氧气浓度下的HCl浓度。
本发明中通过设置HCl吸收器9，在HCl吸收器9中采用水吸收烟气中的HCl，然后将吸收后的吸收液通过蠕动泵送入HCl定量器25，由于在HCl吸收器9中存在鼓泡现象，本发明中吸收液通过第二蠕动泵送入HCl定量器25后，HCl定量器25中无气泡，仅测量测量HCl定量器25的吸收液中的氯的含量，保证测量的准确性。
本发明中通过除盐水作为吸收液，对于电厂来说除盐水很容易得到，只需要连接已有的除盐水管路就可以用于本发明中的测试系统。
与专利CN201920932991.5相比，该专利中1个小时测试一个样品，对应的是1个小时内的HCl的平均浓度，不能实现在线测量；而本发明中可以每分钟的烟气中HCl浓度的测量，数据更具有代表性。
在本发明中，除非另有明确的规定和限定，术语“设置”、“连接”、“进入”、“相连”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
以上内容仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明权利要求书的保护范围之内。

Claims (9)

  1. 一种烟气中HCl的在线测量系统，其特征在于，包括取样系统、HCl吸收器(9)、HCl定量器(25)、供液系统和测量控制系统；取样系统、HCl吸收器(9)、HCl定量器(25)以及供液系统均与测量控制系统相连，其中，取样系统与HCl吸收器(9)气体入口相连，供液系统与HCl吸收器(9)液体入口相连，HCl吸收器(9)气体出口与抽气泵(12)相连，HCl吸收器(9)液体出口经第二蠕动泵(21)与HCl定量器(25)相连；HCl定量器(25)中布置有氯离子检测仪(24)。
  2. 根据权利要求1所述的一种烟气中HCl的在线测量系统，其特征在于，HCl吸收器(9)气体出口经氧气检测仪(11)、抽气泵(12)、湿式流量计(13)与气体流量计(14)相连。
  3. 根据权利要求1所述的一种烟气中HCl的在线测量系统，其特征在于，HCl吸收器(9)为填料塔。
  4. 根据权利要求1所述的一种烟气中HCl的在线测量系统，其特征在于，取样系统包括取样枪(2)、前置过滤器(1)与热电偶，其中，取样枪(2)入口设置前置过滤器(1)，取样枪(2)一侧设置有热电偶。
  5. 根据权利要求2所述的一种烟气中HCl的在线测量系统，其特征在于，取样枪(2)内置石英管或玻璃管，取样枪(2)上设置有伴热系统，取样枪(2)出口经细粉尘过滤器(3)与HCl吸收器(9)相连。
  6. 根据权利要求(5)所述的一种烟气中HCl的在线测量系统，其特征在于，细粉尘过滤器(3)设置在温度为130～180℃的第一温度控制箱(4)内；HCl定量器(25)设置在温度为15～25℃的第三温度控制箱内(26)内；第二蠕动泵(21)经第三液体流量计(22)与HCl定量器(25)相连，HCl定量器(25)中布置有 液位计(23)，取样枪(2)还与压缩空气反吹系统(5)相连。
  7. 根据权利要求6所述的一种烟气中HCl的在线测量系统，其特征在于，供液系统包括吸收液箱(15)、电动调节阀(16)、第一蠕动泵(17)与第一液体流量计(18)，吸收液箱(15)中装有除盐水，吸收液箱(15)出口经电动调节阀(16)、第一蠕动泵(17)、第一液体流量计(18)与HCl吸收器(9)相连。
  8. 一种基于权利要求1-7中任意一项所述的系统的烟气中HCl的在线测量方法，其特征在于，样品气体从取样系统进入HCl吸收器(9)，供液系统中的除盐水进入HCl吸收器(9)中，样品气体中的HCl在HCl吸收器(9)中被捕集后的样品液体经过第二蠕动泵(21)进入氯离子检测仪(24)，测量水中Cl -浓度，并将Cl -浓度数据发送给测量控制系统，根据下式计算烟气中HCl浓度C HCl,烟气：
    C HCl,烟气＝1.028*(Q V,液*C Cl,液体)/Q V,烟气    (1)式中：C HCl,烟气为烟气中HCl浓度；Q V,液为吸收液流量；C Cl,液体为氯离子的质量浓度；Q V,烟气为烟气体积流量。
  9. 一种根据权利要求8所述的烟气中HCl的在线测量方法，其特征在于，HCl吸收器(9)中的样品气体经过氧气检测仪(11)、抽气泵(12)、湿式流量计(13)与气体流量计(14)排出。
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