CN106990064A - Gas concentration lwevel detecting system and detection method in a kind of industrial smoke - Google Patents

Abstract

The invention discloses carbon dioxide detecting system and its detection method in a kind of industrial smoke, this method prepares a series of simulation industrial smoke of known carbon dioxide standard gas concentrations first with the calibrating gas storage tank, gas mass flow gauge and controller of detecting system；Then determine the absorption peak area of different volumes concentration carbon dioxide calibrating gas respectively by the IGS gases infrared spectrum analyser in system, standard fit working curve is set up according to above-mentioned data；Gather industrial smoke to be measured again to measure, measurement result, which is substituted into standard fit working curve, can obtain the content of carbon dioxide in industrial smoke.Detection method of the present invention can record quantitative carbon dioxide and absorb peak area original figure spectrum data, and related data can preserve for a long time, meet carbon emission data values and trace to the source requirements, as a result accurately, accuracy height.

Description

A carbon dioxide concentration detection system and detection method in industrial flue gas

technical field

The invention belongs to the technical field of gas concentration analysis and detection. In particular, it relates to a detection system and a detection method for carbon dioxide concentration in industrial flue gas.

Background technique

my country is the largest developing country in the world and one of the largest coal producers and consumers in the world. Coal occupies a major position in my country's primary energy composition and is widely used in various burners, industrial and commercial boilers. During the application of combustion, a large amount of flue gas will be emitted, and the carbon dioxide emission in the flue gas is The main cause of the greenhouse effect poses a serious threat to the ecological environment. In 2008, global carbon dioxide emissions reached 29.2 billion tons, and China's reached 6 billion tons. Therefore, the detection of carbon dioxide gas content in flue gas is an important aspect of environmental monitoring work, which can grasp the distribution law of carbon dioxide and monitor the changes of energy consumption indicators.

According to the goal of the State Council's "13th Five-Year Plan for Controlling Greenhouse Gas Emissions", by 2020, carbon dioxide emissions per unit of GDP will be reduced by 18% compared with 2015, and the total amount of carbon emissions must be effectively controlled. At present, my country has not yet established a perfect online direct measurement and traceability index of carbon dioxide emissions in industrial flue gas. The average difference between the results obtained by the method and the correct results is 17%, and all of them are negative deviations. The results obtained are quite different from the actual situation. The accuracy of the data obtained by the calculation method cannot meet the precision requirements of carbon trading. Therefore, the ability to accurately obtain the carbon dioxide concentration in industrial flue gas and directly calculate the total carbon emissions in combination with the flue gas emission flow will be of great help to the establishment of a greenhouse gas emission measurement and detection system.

Carbon dioxide concentration measurement methods mainly include chemical method, electrochemical method, gas chromatography, volumetric titration, etc. These methods have defects such as high cost, low processing capacity, poor online large-scale applicability, and low accuracy. Therefore, it has important practical application value to explore the detection method of carbon dioxide concentration in large-flow industrial flue gas with wide measurement range, short response time, high accuracy, strong anti-interference ability, and suitable for online monitoring and data reporting.

Contents of the invention

In order to solve the above problems, the present invention provides a carbon dioxide concentration detection system in industrial flue gas and its detection method, the system ensures uninterrupted continuous operation, improves the repeatability and measurement accuracy of measurement data; the data obtained by the detection method It can be stored for a long time and meet the traceability requirements of carbon emission data, which provides a reliable method basis for the measurement of industrial flue gas carbon emission.

The present invention is achieved through the following technical solutions

A carbon dioxide concentration detection system in industrial flue gas, the system includes a standard gas storage tank, a gas mixing heating pool connected to the standard gas storage tank through a ventilation line, and an IGS gas mixing pool connected to the gas mixing heating pool through a ventilation line Infrared analyzer, the IGS gas infrared analyzer is electrically connected to the signal input end of the data acquisition device; the carbon dioxide concentration detection system in the industrial flue gas also includes an industrial flue gas generation system, which is connected to the industrial flue gas generation system The sampling gun, the dust filter connected to the sampling gun through the ventilation pipeline, the condenser connected to the dust filter through the ventilation pipeline, the sampling pump connected to the condenser through the ventilation pipeline, and the sampling pump connected to the ventilation pipeline The gas mixing heating pool; the carbon dioxide concentration detection system in the industrial flue gas also includes a controller;

The gas outlet of the standard gas storage tank is provided with a gas mass flowmeter, and the gas mixing heating pool and the ventilation pipeline connecting the gas mixing heating pool and the IGS gas infrared analyzer are covered with an electric heating belt ; The gas mass flowmeter and the electric heating belt are electrically connected to the signal output end of the controller. (Turn on the controller, set the value of each standard gas flow in the controller, and then the controller controls the gas mass flowmeter at the outlet of the standard gas storage tank to control the flow of each standard gas; set the temperature value in the controller that is Heating temperature can be controlled).

In the carbon dioxide concentration detection system in the industrial flue gas, the gas mixing heating pool is a columnar shell with ball-shaped steel balls inside.

In the carbon dioxide concentration detection system in industrial flue gas, the gas mixing heating pool is a cylindrical shell with a plurality of flow equalizing tubes arranged in parallel inside, and the spiral blades are arranged in the flow equalizing tubes; Both ends of the flow tube are provided with sealing plates that are sealed and connected to the inner wall of the cylindrical shell. A heating chamber is formed between the sealing plate, the cylindrical shell, and the flow equalizing tube, and a heating medium and an electric heating wire are arranged in the heating chamber.

In the carbon dioxide concentration detection system in industrial flue gas, a rear air chamber is provided at the rear end of the above-mentioned cylindrical housing; a disturbance impeller is pivotally arranged in the axial direction of the rear air chamber, and the rear air chamber also includes a The expansion section at both ends and the contraction section in the middle; a heating sleeve is arranged on the outer wall of the rear air corresponding to the contraction section, and a heating medium and an electric heating wire are arranged between the heating sleeve and the outer wall of the rear air.

In the carbon dioxide concentration detection system in industrial flue gas, the dust filter is a microporous membrane, and the condenser is a semiconductor refrigeration system.

A method for detecting the concentration of carbon dioxide in industrial flue gas by using the above-mentioned carbon dioxide concentration detection system in industrial flue gas, comprising the following steps:

(1) Turn on the controller, set the heating temperature and the flow value of each standard gas, and connect the gas mixing heating pool of the carbon dioxide concentration detection system and the gas mixing heating pool and the IGS gas infrared analyzer through the electric heating belt The ventilation pipeline is heated to a constant temperature (heated to 155±5°C), and the IGS gas infrared analysis is set to the same temperature (that is, set to 155±5°C);

(2) To establish a standard fitting working curve, the steps are as follows:

① Open the valve of the standard gas storage tank of the carbon dioxide concentration detection system and the gas mass flowmeter set at the gas outlet, and each standard gas leads to the gas mixing heating pool through the ventilation pipeline according to the flow rate set by the controller in step (1). Mix and prepare a series of simulated industrial flue gas with known carbon dioxide standard gas volume concentration, and heat it to a constant temperature in the gas mixing heating pool;

②. The simulated industrial flue gas prepared in step ① is passed into the IGS gas infrared analyzer through the gas mixing heating pool through the ventilation pipeline for detection (the flow rate of the gas into the IGS gas infrared analyzer is 3000ml/min), and the detection result passes The signal input terminal of the data acquisition device is input into the data acquisition device, and the detection result is displayed;

③. Draw a standard working curve according to the known carbon dioxide concentration in step ① and the corresponding test results in step ②, and fit the standard working curve according to the least square method to obtain a standard fitting working curve;

(3) Measurement of carbon dioxide concentration in industrial flue gas, the steps are as follows:

a. Close the valve of the standard gas storage tank described in step (2) ① and the gas mass flow meter arranged at the gas outlet, open the valve of the industrial flue gas generation system, and adopt a sampling gun and a sampling pump to collect the industrial flue gas generation system The collected industrial flue gas is filtered through a dust filter, and then condensed by a condenser. The industrial flue gas after condensation is passed through the ventilation pipeline and the sampling pump installed on the ventilation pipeline to mix the gas. Heating pool; (the dust filter is mainly used to filter and remove dust particles in the flue gas, and the condenser is mainly used to remove water vapor in the flue gas so as not to affect the carbon dioxide measurement. During the work, the condenser The condensation temperature is 2°C);

b. The industrial flue gas that is passed into the gas mixing heating pool described in step a is heated and then passed through the ventilation pipeline and passed into the IGS gas infrared analyzer at a flow rate of 1500-3000ml/min for detection, and the detection results are passed through the data acquisition device. The signal input terminal is input into the data acquisition device, and the detection result is displayed;

c. According to the standard fitting working curve obtained in step (2) and the detection result of carbon dioxide in the industrial flue gas described in step (3) b, calculate the concentration of carbon dioxide in the industrial flue gas.

In the method for detecting the concentration of carbon dioxide in industrial flue gas, the temperature of the gas mixing heating pool and the ventilation pipeline connecting the gas mixing heating pool and the IGS gas infrared analyzer in step (1) is 155 ± 5 ° C, The temperature set for the IGS gas infrared analysis is also 155±5°C.

The method for detecting the concentration of carbon dioxide in industrial flue gas, step (2) ① described a series of known standard gas volume concentrations of carbon dioxide are respectively 8.01%, 10.00%, 11.90%, 14.00%, 15.50%, 18.00%; wherein The SO ₂ content is (1200-1700) mg/Nm3; the NO content is (500-1000) mg/Nm ³ , and N ₂ exists as a diluent gas.

In the method for detecting carbon dioxide concentration in industrial flue gas, in step (2)②, the simulated industrial flue gas flows into the IGS gas infrared analyzer from the gas mixing heating pool at a flow rate of 3000ml/min.

In the method for detecting the concentration of carbon dioxide in industrial flue gas, the condensation temperature of the condenser in step (3)a is 2°C; the sampling flow rate of the sampling pump is controlled to be 1500-3000ml/min.

The "simulated industrial flue gas" in the present invention refers to: according to the composition of the actual industrial flue gas and the content range of each component, a variety of standard gases are used to simulate the preparation of industrial flue gas through the control of the controller and the gas mass flow meter Mixed gas (the main components of the gas are CO ₂ , SO ₂ , NO, N ₂ ); through the control of the controller and the gas mass flow meter, prepare a series of simulated industrial flue gas with known standard gas volume concentration of carbon dioxide.

The volume concentration of carbon dioxide gas in the industrial flue gas is 5%-20%.

After absorbing energy of different wavelengths, different gas molecules will leave special absorption peak shapes on the infrared spectrum. The shape of the absorption spectrum curve of the same substance is the same, and the concentration difference will only cause the size of the absorption spectrum to change, that is, the absorption spectrum There is a functional relationship between the area and the concentration. Based on this unique absorption structure, it is called the "spectral fingerprint" of the gas, and based on this analysis, different gases can be identified and their concentrations can be determined;

Each asymmetric gas molecule in the Fourier transform infrared absorption region has a unique absorption peak, and quantitative or qualitative analysis can be carried out through these absorption information. The absorption intensity in the range has a linear or nonlinear relationship with the concentration of the mixed gas components; there is a large absorption coefficient in the characteristic wavelength range;

Based on the above considerations, a small characteristic absorption peak in the range of (2400-2200) cm ^-1 is selected as the best quantitative characteristic absorption peak of carbon dioxide through experiments, as shown in Figure 4, and its specific range is (2240-2238) cm ^-1 , as shown in Figure 5, its peak area is directly proportional to the level of carbon dioxide concentration, so the carbon dioxide concentration can be obtained indirectly by measuring the small absorption peak area of carbon dioxide in the (2240-2238) cm ^-1 region.

Compared with the prior art, the present invention has the following positive beneficial effects:

In the process of data collection, the present invention first pre-processes the flue gas, removes the dust particles and water vapor in the flue gas, avoids the interference of dust and water vapor on the measurement results, and not only ensures that the method can be operated continuously without interruption , also improves the repeatability and measurement accuracy of measurement data;

At present, most direct-reading instruments cannot retain the original data of carbon dioxide. The invention can not only display the concentration of carbon dioxide in real time, but also record the original map data of the quantitative absorption peak area of carbon dioxide. The relevant data can be stored for a long time, meeting the traceability requirements of carbon emission data. , providing a reliable method basis for the measurement of industrial flue gas carbon emissions.

Description of drawings

Fig. 1 is the schematic diagram of carbon dioxide concentration measuring system;

Fig. 2 is one of the structural representations of the gas mixing heating pool;

Fig. 3 is the second structural diagram of the gas mixing heating pool;

Fig. 4 is carbon dioxide infrared characteristic absorption spectrum;

Figure 5 is a carbon dioxide quantitative characteristic absorption spectrum;

Fig. 6 is the standard fitting working curve used in the measurement of carbon dioxide concentration in industrial flue gas;

The meanings of the symbols in the figure are: 1 is the standard gas storage tank, 2 is the gas mass flow meter, 3 is the gas mixing heating pool, 4 is the electric heating belt, 5 is the IGS gas infrared analyzer, 6 is the data acquisition device, 7 is an industrial smoke generation system, 8 is a sampling gun, 9 is a dust filter, 10 is a condenser, 11 is a sampling pump, and 12 is a controller;

301 is a columnar shell, 302 is a ball of steel wire, 303 is a rear air chamber, 304 is a disturbance impeller, 305 is a heating sleeve, 306 is an electric heating wire, 307 is a flow equalizer, 308 is a spiral blade, 309 is a seal plate.

detailed description

The present invention will be described in more detail through specific embodiments below, but it is not intended to limit the protection scope of the present invention.

Example 1

A carbon dioxide concentration detection system in industrial flue gas, as shown in Figure 1, the system includes a standard gas storage tank 1, a gas mixing heating pool 3 connected to the standard gas storage tank 1 through a ventilation line, and a gas mixing pool 3 through a ventilation line. The IGS gas infrared analyzer 5 connected to the mixing heating pool 3, the IGS gas infrared analyzer 5 is electrically connected to the signal input end of the data acquisition device 6; the carbon dioxide concentration detection system in the industrial flue gas also includes an industrial The flue gas generation system 7, the sampling gun 8 connected with the industrial flue gas generation system 7, the dust filter 9 connected with the sampling gun 8 through the ventilation pipeline, the condenser 10 connected with the dust filter 9 through the ventilation pipeline, The sampling pump 11 communicated with the condenser 10 through the ventilation pipeline, the gas mixing heating pool 3 communicated with the sampling pump 11 through the ventilation pipeline; the carbon dioxide concentration detection system in the industrial flue gas also includes a controller 12;

The gas outlet of the standard gas storage tank 1 is provided with a gas mass flowmeter 2, and the gas mixing heating pool 3 and the ventilation pipeline connecting the gas mixing heating pool 3 and the IGS gas infrared detector 5 are all coated An electric heating belt 4 is provided; the gas mass flowmeter 2 and the electric heating belt 4 are both electrically connected to the signal output end of the controller 12 .

As shown in Fig. 2 and Fig. 3, the gas mixing heating pool 3 is a cylindrical housing 301 with ball-like steel balls 302 inside; the gas mixing heating pool can also be provided with a plurality of The cylindrical shell 301 of the flow equalizing tube 307 , the spiral blade 308 is arranged in the said flow equalizing tube 307 . When the gas mixing heating pool adopts the structural design of a cylindrical shell 301 with a plurality of flow equalizing tubes 307 arranged in parallel inside, the two ends of the flow equalizing tube 307 are provided with sealing plates 309 that are sealed and connected to the inner wall of the cylindrical shell 301, A heating cavity is formed between the sealing plate 309 , the cylindrical housing 301 and the flow equalizing tube 307 , and a heating medium and an electric heating wire 306 are arranged in the heating cavity.

A rear air chamber 303 is provided at the rear end of the above-mentioned cylindrical shell, and a disturbance impeller 304 is pivotally connected in the axial direction of the rear air chamber 303 to rotate and stir the gas evenly under the action of the air flow. The rear air chamber also includes two The expansion section at the end and the contraction section in the middle, so that the air flow can be fully mixed evenly through turbulent expansion and compression transformation; the outer wall of the rear air chamber 303 corresponding to the contraction section is provided with a heating sleeve 305, and the heating sleeve 305 and the rear air chamber A heating medium and an electric heating wire 306 are arranged between the outer walls of 303 .

The above-mentioned dust filter is a microporous membrane, and the condenser is a semiconductor refrigeration system.

Example 2

One of the methods for detecting carbon dioxide concentration in industrial flue gas by the carbon dioxide concentration detection system in industrial flue gas described in embodiment 1 may further comprise the steps:

(1) Turn on the controller, set the temperature value on the controller, and heat the gas mixing heating pool in the carbon dioxide concentration detection system and the ventilation pipeline connecting the gas mixing heating pool and the IGE gas infrared analyzer to 155 through the electric heating belt. ±5°C constant temperature, and set the measurement temperature of the IGS gas infrared analyzer to 155±5°C; set the flow rate value of each standard gas on the controller, and the controller controls the gas outlet of the standard gas storage tank according to the set value The gas mass flowmeter can control the gas flow;

(2) To establish a standard fitting working curve, the steps are as follows:

①. After the valves and gas mass flowmeters of the standard gas CO ₂ , SO ₂ , NO, N ₂ storage tanks in the carbon dioxide concentration detection system are opened, each standard gas passes through the ventilation pipeline according to the flow rate set by the controller in step (1). Lead to the gas mixing heating pool for mixing, prepare simulated industrial flue gas with a standard gas volume concentration of carbon dioxide of 8.01%, and heat it to a constant temperature in the gas mixing heating pool;

2. The simulated industrial flue gas prepared in step 1 is passed into the IGS gas infrared analyzer (Antaris IGS, Thermo Company) through the gas mixing heating pool through the heated and constant temperature ventilation pipeline for detection (the simulated industrial flue gas is passed into the IGS The flow rate of the gas infrared detector is 3000ml/min), the detection result is input into the data acquisition device through the signal input terminal of the data acquisition device, and the detection result is displayed. The simulated industrial flue gas is measured repeatedly three times, and the obtained results are shown in Table 1 shown;

Then according to step (2) described steps 1., 2. operation, the carbon dioxide standard gas volume concentration that the system controls preparation is respectively 10.00%, 11.90%, 14.00%, 15.50%, 18.00% simulated industrial flue gas is passed into IGS gas Detect in the infrared analyzer, the simulated industrial flue gas of each volume concentration is measured repeatedly three times, and the results obtained by the detection are respectively input to the data acquisition device through the signal input end of the data acquisition device, and the displayed data are shown in Table 1;

3. According to step 1., the volume concentration of standard carbon dioxide gas in the simulated industrial flue gas described in 2. and the detection result (absorption peak area) corresponding to each concentration draws a standard working curve, then fits according to the least squares method to obtain the standard working curve The regression equation y=a+bx of the curve is calculated through fitting: a=0.0254, b=1.25501, R ² =0.99965, that is, the standard fitting working curve y=0.0254+1.25501x, as shown in Figure 6; The linearity error of the standard fitting working curve is ≤±1%, indicating that the working curve of the test system is well linear and can be used to measure the concentration of carbon dioxide in actual industrial flue gas;

In the above regression equation formula, x: represents the concentration of carbon dioxide in the obtained flue gas (%); y: represents the characteristic absorption peak area (PA*S) of carbon dioxide obtained during the measurement of industrial flue gas; a: represents the intercept; b: Indicates the slope;

Table 1 Corresponding relationship between _CO2 standard gas concentration in simulated industrial flue gas and metering characteristic absorption peak area

(3) Measurement of carbon dioxide concentration in flue gas produced by coal-fired industry (Gongyi coal-fired power plant), the steps are as follows:

a. close step (2) 1. the valve of the standard gas storage tank and the gas mass flow meter arranged at the gas outlet place, open the valve of the industrial flue gas generation system (valve is installed in the industrial chimney sampling gas path), through sampling The gun and sampling pump collect the industrial flue gas in the industrial flue gas generation system. The collected industrial flue gas enters the dust filter through the ventilation pipeline for filtration, removes the dust contained in the industrial flue gas, and then enters the condenser through the ventilation pipeline. , Condensation is carried out at 2°C to remove the water vapor contained in the industrial flue gas, and the industrial flue gas with moisture removed passes through the sampling pump and then enters the gas mixing heating pool with a constant temperature of 155±5°C;

b. The industrial flue gas heated in step a enters the IGS gas infrared analyzer at a flow rate of 3000ml/min through the ventilation pipeline heated to a constant temperature of 155±5°C for detection, and the detection result is passed through the signal input terminal of the data acquisition device Enter the data acquisition device, repeat the test three times, and display the test result: under this condition, the average value of the characteristic absorption peak area of carbon dioxide in industrial flue gas is 0.18227PA*S;

c. Substituting the test results of step (3)b into the standard fitting working curve formula obtained in step (2), the calculation can be obtained: the volume concentration of carbon dioxide in the industrial flue gas is 12.5%.

In addition, the Yikang J2KNTECH portable multifunctional flue gas analyzer was used to analyze the measured flue gas, and the volume concentration of carbon dioxide in the industrial flue gas was analyzed to be 12.4%.

Example 3

The second method for detecting the concentration of carbon dioxide in industrial flue gas by using the carbon dioxide concentration detection system in industrial flue gas described in Example 1 comprises the following steps:

The same as Example 2 will not be repeated, and the difference is: the flue gas produced by the gas industry (Zhengzhou gas-fired power plant) is collected, and after the treatment, it is passed into the gas mixing heating pool, and the industrial smoke in the gas mixing heating pool The gas is passed into the IGS gas infrared analyzer at a flow rate of 2000ml/min for detection and analysis, and the detection is repeated three times. Under this condition, the average value of the characteristic absorption peak area of carbon dioxide in industrial flue gas is 0.15341PA*S;

Then the obtained results were substituted into the standard fitting working curve equation described in step (2) of Example 2, and the volume concentration of carbon dioxide in the industrial flue gas was calculated to be 10.2%.

In addition, the Yikang J2KNTECH portable multifunctional flue gas analyzer was used to analyze the measured flue gas, and the volume concentration of carbon dioxide in the industrial flue gas was analyzed to be 10.1%.

Example 4

The second method for detecting the concentration of carbon dioxide in industrial flue gas by using the carbon dioxide concentration detection system in industrial flue gas described in Example 1 comprises the following steps:

The same as Example 2 will not be repeated, and the difference is: the flue gas produced by the coal-fired industry (Jiaozuo Chinalco self-provided power plant) is collected, and after the treatment, it is passed into the gas mixing heating pool, and the gas mixing heating pool The industrial flue gas is passed into the IGS gas infrared analyzer at a flow rate of 1500ml/min for detection and analysis, and the detection is repeated three times. Under this condition, the average value of the characteristic absorption peak area of carbon dioxide in the industrial flue gas is 0.17098PA*S;

Then the obtained results were substituted into the standard fitting working curve equation described in step (2) of Example 2, and the volume concentration of carbon dioxide in the industrial flue gas was calculated to be 11.6%.

In addition, the Yikang J2KNTECH portable multifunctional flue gas analyzer was used to analyze the measured flue gas, and the volume concentration of carbon dioxide in the industrial flue gas was analyzed to be 11.5%.

From the above, it can be known that the detection method of the present invention can record the original spectrum data of carbon dioxide quantitative absorption peak area, and the relevant data can be stored for a long time, meeting the requirements of traceability of carbon emission data, and the results are accurate and precise.

Claims (10)

1. gas concentration lwevel detecting system in a kind of industrial smoke, it is characterised in that the system includes calibrating gas storage tank, The gas being connected by ventilation line with calibrating gas storage tank mixes heating bath, is mixed and heated by ventilation line and gas The IGS gas infrared spectrum analysers that pond is connected, described IGS gases infrared spectrum analyser and the signal input part of data acquisition device Electrical connection；Gas concentration lwevel detecting system also includes industrial smoke generation system in described industrial smoke, with industrial smoke The sampling gun that generation system is connected, the dust filter unit being connected by ventilation line with sampling gun, by ventilation line with The condenser that dust filter unit is connected, the sampling pump being connected by ventilation line with condenser, by ventilation line with adopting The gas that sample pump is connected mixes heating bath；Gas concentration lwevel detecting system also includes controller in described industrial smoke；

Described calibrating gas storage tank gas outlet is provided with gas mass flow gauge；Described gas mix heating bath with And connection gas mixes heating bath and cladding is provided with heat tape in the ventilation line of IGS gas infrared spectrum analysers；It is described Gas mass flow gauge and heat tape electrically connected with the signal output part of controller.

2. gas concentration lwevel detecting system in industrial smoke according to claim 1, it is characterised in that described gas It is the cylindrical shell for being internally provided with bulk steel wire lump to mix heating bath.

3. gas concentration lwevel detecting system in industrial smoke according to claim 1, it is characterised in that described gas It is to be provided with helical blade in the cylindrical shell that interior parallel is provided with multiple equal flow tubes, described equal flow tube to mix heating bath； Described equal flow tube is provided at both ends with the shrouding being connected with cylindrical shell inner wall sealing, the shrouding, cylindrical shell, equal flow tube it Between formed heating medium and electrical heating wire be provided with heating chamber, heating chamber.

4. gas concentration lwevel detecting system in the industrial smoke according to Claims 2 or 3, it is characterised in that described Cylindrical shell rear end is provided with rear gas chamber；Axially pivot joint is provided with disturbance impeller in described rear gas chamber, and the rear gas chamber also wraps Include the expansion arc and the contraction section positioned at middle part positioned at two ends；Heating mantle is provided with rear gas chamber corresponding with contraction section outer wall Pipe, provided with heating medium and electrical heating wire between heating muff and rear gas chamber's outer wall.

5. gas concentration lwevel detecting system in industrial smoke according to claim 1, it is characterised in that described dust Filter is miillpore filter, and described condenser is semiconductor refrigeration system.

6. dioxy in gas concentration lwevel detecting system detection industrial smoke in the industrial smoke described in a kind of use claim 1 Change the method for concentration of carbon, it is characterised in that comprise the following steps：

(1) data on flows of controller, setting heating-up temperature and every kind of calibrating gas is opened, the gas concentration lwevel is detected The gas of system mixes heating bath and connection gas mixes heating bath and the ventilation line heating of IGS gas infrared spectrum analysers is permanent Temperature, and IGS gas infrared analysis is set as identical temperature；

(2) standard fit working curve is set up, step is as follows：

1. opens the gas matter that the valve and gas outlet of the calibrating gas storage tank of gas concentration lwevel detecting system are set Flowmeter is measured, the flow that every kind of calibrating gas is set according to step (1) controller leads to gas by ventilation line and mixes heating Pond, a series of simulation industrial smoke of known carbon dioxide standard gas volume concentration of mixed preparing, and mix heating in gas Constant temperature is heated in pond；

2. it is infrared that the simulation industrial smoke that 1. prepares step is passed through IGS gases by gas mixing heating bath, by ventilation line Analyzer is detected, in the signal input part input data harvester that testing result passes through data acquisition device, shows number According to；

3. according to step 1. known gas concentration lwevel and step 2. correspond to detection result draw standard working curve, and Standard working curve is fitted and obtains standard fit working curve；

(3) in industrial smoke gas concentration lwevel measurement, step is as follows：

A. close step (2) and 1. the valve of the calibrating gas storage tank and be arranged on the gas mass flow of gas outlet Meter, opens the valve of industrial smoke generation system, and the industrial cigarette of industrial smoke generation system is gathered using sampling gun and sampling pump Gas, the industrial smoke of collection carries out filtration treatment by dust filter unit, is then carried out by condenser at condensation process, condensation Industrial smoke after reason is passed through gas by ventilation line and the sampling pump being arranged in ventilation line and mixes heating bath；

B. the industrial smoke that gas mixing heating bath is passed through described in step a is passed through IGS gas after heating by ventilation line Detected in body infrared radiation detection apparatus, the signal input part input data harvester that testing result passes through data acquisition device In, display data；

C. carbon dioxide is examined in the industrial smoke according to obtained by the standard fit working curve obtained by step (2) and step (3) b Result is surveyed, calculating obtains gas concentration lwevel content in industrial smoke.

7. the method for gas concentration lwevel in detection industrial smoke according to claim 6, it is characterised in that step (1) The gas mixes heating bath and connection gas mixes the ventilation line heated constant temperature of heating bath and IGS gas infrared spectrum analysers Temperature be 155 ± 5 DEG C, the temperature of IGS gases infrared analysis setting is all 155 ± 5 DEG C.

8. the method for gas concentration lwevel in detection industrial smoke according to claim 6, it is characterised in that step (2) 1. a series of known carbon dioxide standard gas volume concentration are respectively 8.01%, 10.00%, 11.90%, 14.00%, 15.5%, 18.00%.

9. the method for gas concentration lwevel in detection industrial smoke according to claim 6, it is characterised in that step (2) 2. the simulation industrial smoke mixes heating bath by gas and is passed through the gas flow of IGS gas infrared spectrum analysers for 3000ml/ min。

10. the method for gas concentration lwevel in detection industrial smoke according to claim 6, it is characterised in that step (3) The condensation temperature of condenser described in a is 2 DEG C；The sampling flow control of the sampling pump is 1500~3000ml/min.