A multi-component flue gas measurement system and its usage method

Abstract

The present invention discloses a multi-component measurement system for flue gas and a usage method thereof. The system includes a high-temperature chamber and a multi-component measurement device, an oxygen measurement device, an ammonia measurement device, and a jet device disposed in the high-temperature chamber; the multi-component measurement device includes a multi-component measurement cell and a sampling tube, a vacuum gauge, a NO dilution probe interface, a direct NO extraction measurement interface, and a CO measurement interface sequentially disposed on the multi-component measurement cell; the oxygen measurement device includes an oxygen measurement cell, and an oxygen measurement interface is provided on the oxygen measurement cell; the ammonia measurement device includes an ammonia measurement cell, a spectroscopic ammonia measurement interface is provided on the ammonia measurement cell, a connecting pipe is provided between the ammonia measurement cell and the oxygen measurement cell, and an extraction method ammonia measurement interface is provided on the connecting pipe; the jet device includes a jet. The present invention introduces the flue gas to be measured through the sampling tube, so that the flue gas sources measured by each component measurement instrument are the same and the flow rates are the same, effectively reducing the measurement error and avoiding the measurement and analysis difficulties caused by different flue gas sources.

Description

Technical Field

[0001] The present invention belongs to the technical field of gaseous pollutant measurement, and particularly relates to a flue gas multi-component measurement system and a usage method thereof. Background Art

[0002] With the implementation of the ultra-low emission transformation of flue gas denitrification in coal-fired power plants, while the denitrification efficiency is gradually increasing, the ammonia slip is also gradually increasing. Due to the harmfulness of ammonia slip to air preheaters and tail flue ducts, each power plant has put forward higher requirements for adjusting the uniformity of NOx at the denitrification outlet. The efficiency control of coal-fired boilers requires the measurement of the CO component in flue gas. With the development of technology, various requirements for the measurement of flue gas components will emerge. Currently, the measurement sampling gases of each flue gas component measurement interface are arranged on the flue duct wall, and the measurement sampling gases of each instrument are not from the same source, which brings certain troubles to data analysis; when the types of components to be measured increase, arranging measurement interfaces on the flue duct wall requires processing and transformation of the flue duct wall, and the installation of instruments is relatively complex; the flue gas flow velocity in the flue duct is unstable, and the flue gas pressures passing through each analytical instrument are quite different, resulting in detection errors of the analytical instrument; the flue gas in the flue duct is untreated and contains a large number of dust particles. Each instrument is directly connected to the flue duct, and the working load of the probe filter element is relatively large, affecting the service life and effective working time. Therefore, inventing a flue gas multi-component measurement system to avoid extracting different sampling gases during the analysis of flue gas and ensuring the identity and simultaneity of the sampling gas during the analysis of flue gas components is of great significance for the analysis of denitrification flue gas components and the stable operation of boilers. Summary of the Invention

[0003] The purpose of the present invention is to provide a flue gas multi-component measurement system and a usage method thereof to solve the problems of inconsistent measurement sources of each component of denitrification flue gas, unstable flue gas flow velocity, difficult analysis and processing of measurement data, and difficult arrangement of interfaces on the flue duct wall in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A flue gas multi-component measurement system includes a high-temperature chamber, and a multi-component measurement device, an oxygen measurement device, an ammonia measurement device, and a jet device which are arranged in the high-temperature chamber and are sequentially connected in series along the gas flow direction from front to back;

[0006] The multi-component measurement device includes a multi-component measurement cell, and a sampling tube, a vacuum gauge, a NO dilution probe interface, a NO direct extraction method measurement interface, and a CO measurement interface which are arranged on the multi-component measurement cell;

[0007] The oxygen measurement device includes an oxygen measurement cell, the oxygen measurement cell is communicated with the multi-component measurement cell, and an oxygen measurement interface is arranged thereon;

[0008] The ammonia measurement device includes an ammonia measurement cell, on which a spectroscopic ammonia measurement interface is provided. The ammonia measurement cell is communicated with an oxygen measurement cell through a connecting pipe, and an extraction method ammonia measurement interface is provided on the connecting pipe.

[0009] The jet device includes a jet ejector. The air inlet of the jet ejector is connected to the ammonia measurement cell, its air outlet is provided with an air outlet pipe, and its air jet outlet is provided with a compressed air inlet pipe. A heater and a pressure stabilizing valve are provided on the compressed air inlet pipe.

[0010] The outer ends of the sample injection pipe, the air outlet pipe and the compressed air inlet pipe all extend out of the high-temperature chamber.

[0011] Further, it further includes a purging device, which is connected to the PLC control system. The purging device includes a purge valve, a vent valve and a shut-off valve. The purge valve is arranged between the jet ejector and the ammonia measurement cell; the shut-off valve is arranged on the sample injection pipe; a vent pipe is arranged on the sample injection pipe between the shut-off valve and the multi-component measurement cell, and the vent valve is arranged on the vent pipe.

[0012] Further, a NO dilution method measurement interface flange is arranged at the position corresponding to the NO dilution probe interface on the inner wall of the high-temperature chamber; the oxygen measurement interface is an oxygen measurement interface flange; the spectroscopic ammonia measurement interface is a spectroscopic ammonia measurement interface flange.

[0013] Further, other component measurement interfaces are provided on the multi-component measurement cell.

[0014] Further, the outer end of the sample injection pipe is connected to a pre-dust removal device.

[0015] Further, the NO dilution method measurement interface flange, the oxygen measurement interface flange and the spectroscopic ammonia measurement interface flange are all arranged on the inner wall of the high-temperature chamber.

[0016] Further, the outer end of the vent pipe extends out of the high-temperature chamber.

[0017] A method for measuring multi-components of flue gas using a multi-component flue gas measurement system includes the following steps:

[0018] Step 1, instrument installation. Select the NO and NH3 measurement methods according to the measurement requirements, then connect each measurement instrument to the corresponding measurement interface, check the airtightness of the system. After meeting the airtightness requirements, adjust the temperature of the high-temperature chamber, and then open the shut-off valve through the PLC control system, close the vent valve and the purge valve, and zero each measurement instrument.

[0019] Step 2, introduce compressed air. Adjust the temperature and flow rate of the compressed air entering the jet ejector by adjusting the heater and the pressure stabilizing valve to stabilize the vacuum degree in the multi-component measurement cell.

[0020] Step 3: Measuring the flue gas to be measured. Driven by the injector, the flue gas to be measured enters from the sampling pipe, successively passes through the multi-component measurement cell, the oxygen measurement cell, the connecting pipe, and the ammonia measurement cell, and is discharged to the outside of the high-temperature chamber together with the compressed air from the outlet pipe of the injector. Each instrument extracts the flue gas for flue gas component detection and analysis;

[0021] Step 4: System purging. Through the PLC control system, the shut-off valve is closed, the drain valve is opened, and then the purge valve is opened. The compressed air successively passes through the ammonia measurement cell, the connecting pipe, the oxygen measurement cell, and the multi-component measurement cell, and is discharged to the outside of the high-temperature chamber from the drain pipe.

[0022] Further, in the said Step 1, the temperature of the high-temperature chamber is 260~350°C.

[0023] Further, in the said Step 2, the pressure in the multi-component measurement cell is -3~-15 kPa; the flow rate of the compressed air entering the injector is 2 Nm³ / min, and the temperature is 260°C.

[0024] The present invention has the following beneficial effects:

[0025] 1. A flue gas multi-component measurement system and its use method provided by the present invention introduce the flue gas to be measured through the sampling pipe, so that the flue gas sources measured by each component measurement instrument are the same. The whole measurement process is carried out in the high-temperature chamber, realizing flue gas fidelity, reducing measurement errors, and avoiding difficulties in measurement and analysis caused by different flue gas sources.

[0026] 2. A flue gas multi-component measurement system and its use method provided by the present invention realize the compatibility of two detection methods, namely the NO dilution method and the direct extraction method, by setting the NO dilution method measurement interface flange and the NO direct extraction method measurement interface, and realize the compatibility of two detection methods for NH3, namely the extraction method and the laser spectroscopy extraction method, by setting the extraction method ammonia measurement interface and the spectroscopy method ammonia measurement interface flange. When high detection accuracy is required, two methods can be used to synchronously measure NO and NH3, improving the accuracy of the detection results, meeting different measurement requirements, and having a wide range of application scenarios.

[0027] 3. A flue gas multi-component measurement system and its use method provided by the present invention avoid setting multiple instrument interfaces on the flue gas duct wall, are easy to operate, save installation costs, improve detection efficiency. At the same time, the flue gas contacted by each detection instrument is the flue gas after filtering the soot, greatly reducing the working load of each probe filter element, and effectively improving the service life and effective working time of each measurement instrument.

[0028] 4. A flue gas multi-component measurement system and its use method provided by the present invention control the pressure regulating valve to make the compressed air enter the system at a stable flow rate, avoiding detection errors of the analysis instrument caused by large differences in the flue gas pressure passing through the analysis instrument due to unstable flue gas flow rate, and improving the accuracy of the detection results. Brief Description of the Drawings

[0029] Figure 1 It is a schematic flow diagram of a multi-component measurement system for flue gas related to the present invention.

[0030] In the figure: 1 - High-temperature chamber, 2 - Multi-component measurement device, 2.1 - Multi-component measurement cell, 2.2 - Sampling tube, 2.3 - Vacuum gauge, 2.4 - NO dilution probe interface, 2.5 - NO dilution method measurement interface flange, 2.6 - NO direct extraction method measurement interface, 2.7 - CO measurement interface, 2.8 - Other component measurement interfaces, 3 - Oxygen measurement device, 3.1 - Oxygen measurement cell, 3.2 - Oxygen measurement interface flange, 4 - Ammonia measurement device, 4.1 - Ammonia measurement cell, 4.2 - Connecting pipe, 4.3 - Extraction method ammonia measurement interface, 4.4 - Spectrometric method ammonia measurement interface flange, 5 - Jet device, 5.1 - Jet, 5.2 - Compressed air inlet pipe, 5.3 - Outlet pipe, 5.4 - Heater, 5.5 - Pressure regulating valve, 6 - Purge device, 6.1 - Purge valve, 6.2 - Drain valve, 6.3 - Shut-off valve. Detailed Embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] As Figure 1 shown, a multi-component measurement system for flue gas provided by the present invention includes a high-temperature chamber 1 and a multi-component measurement device 2, an oxygen measurement device 3, an ammonia measurement device 4, and a jet device 5 that are arranged in the high-temperature chamber 1 and are connected in sequence from front to back along the gas flow direction. The measurement system is controlled and adjusted by a PLC control system.

[0033] The multi-component measurement device 2 includes a multi-component measurement cell 2.1 and a sampling tube 2.2, a vacuum gauge 2.3, a NO dilution probe interface 2.4, a NO direct extraction method measurement interface 2.6, a CO measurement interface 2.7, and other component measurement interfaces 2.8 that are sequentially arranged on the multi-component measurement cell 2.1. The NO dilution probe interface 2.4 is used to connect a NO dilution probe, and a NO dilution method measurement interface flange 2.5 is arranged on the other side of the dilution probe. The NO dilution method measurement interface flange 2.5 is used to connect a NO dilution method measurement instrument. The NO direct extraction method measurement interface 2.6 is used to connect a NO direct extraction method measurement instrument, and the CO measurement interface 2.7 is used to connect a direct extraction method CO analysis instrument.

[0034] The oxygen measurement device 3 includes an oxygen measurement cell 3.1. The oxygen measurement cell 3.1 is communicatively connected to the multi-component measurement cell 2.1. One end of the oxygen measurement cell 3.1 is provided with an oxygen measurement interface flange 3.2, and the oxygen measurement interface flange 3.2 is used to connect an oxygen measurement instrument, and the oxygen measurement instrument is preferably a zirconia measurement instrument.

[0035] The ammonia measurement device 4 includes an ammonia measurement cell 4.1. Spectroscopic ammonia measurement interface flanges 4.4 are respectively provided at both ends of the ammonia measurement cell 4.1. The spectroscopic ammonia measurement interface flanges 4.4 are used to connect a laser spectroscopic extraction method ammonia test instrument. A connecting pipe 4.2 is provided between the ammonia measurement cell 4.1 and the oxygen measurement cell 3.1. An extraction method ammonia measurement interface 4.3 is provided on the connecting pipe 4.2, and the extraction method ammonia measurement interface 4.3 is used to connect an extraction method ammonia test instrument.

[0036] The jet device 5 includes a jet ejector 5.1. The air inlet of the jet ejector 5.1 is connected to the ammonia measurement cell 4.1. A compressed air inlet pipe 5.2 is provided at the jet outlet. The outer end of the compressed air inlet pipe 5.2 is located outside the high-temperature chamber 1. A heater 5.4 and a pressure stabilizing valve 5.5 are provided on the compressed air inlet pipe 5.2 outside the high-temperature chamber 1 from the inside to the outside. Compressed air enters from the compressed air inlet pipe 5.2, passes through the regulation of the pressure stabilizing valve 5.5 and the heating of the heater 5.4, and then enters the jet ejector 5.1. An outlet pipe 5.3 is provided at the outlet of the jet ejector 5.1, and the outer end of the outlet pipe 5.3 is located outside the high-temperature chamber 1.

[0037] The flue gas to be measured enters from the sampling pipe 2.2, sequentially passes through the multi-component measurement cell 2.1, the oxygen measurement cell 3.1, the connecting pipe 4.2, and the ammonia measurement cell 4.1, and finally is discharged to the outside of the high-temperature chamber 1 together with the compressed air from the outlet pipe 5.3 of the jet ejector 5.1. Each instrument such as the NO dilution method measurement instrument, the NO direct extraction method measurement instrument, the CO analysis instrument, the zirconia measurement instrument, the extraction method ammonia test instrument, and the laser spectroscopic extraction method ammonia test instrument extracts flue gas through the NO dilution method measurement interface flange 2.5, the NO direct extraction method measurement interface 2.6, the CO measurement interface 2.7, the oxygen measurement interface flange 3.2, the extraction method ammonia measurement interface 4.3, the spectroscopic ammonia measurement interface flange 4.4, and other component measurement interfaces 2.8 for flue gas component detection and analysis. By setting the NO dilution method measurement interface flange 2.5 and the NO direct extraction method measurement interface 2.6, the compatibility of the two detection methods of the NO dilution method and the direct extraction method is realized. By setting the extraction method ammonia measurement interface 4.3 and the spectroscopic ammonia measurement interface flange 4.4, the compatibility of the two detection methods of the NH3 extraction method and the laser spectroscopic extraction method is realized. When the detection accuracy requirement is relatively high, the two methods can be used to synchronously measure NO and NH3 to improve the accuracy of the detection results, which can meet different measurement requirements and has a wide range of application scenarios. By presetting the measurement interface, the installation difficulty of the detection instrument is reduced and the detection efficiency is improved.

[0038] A multi-component flue gas measurement system further includes a purging device 6, which includes a purge valve 6.1, a vent valve 6.2 and a shut-off valve 6.3. The shut-off valve 6.3 is arranged on the sampling pipe 2.2, and a vent pipe is arranged on the sampling pipe 2.2 between the shut-off valve 6.3 and the multi-component measurement cell 2.1. The outer end of the vent pipe is arranged outside the high-temperature chamber 1, and the vent valve 6.2 is arranged on the vent pipe outside the high-temperature chamber 1; the purge valve 6.1 is arranged between the ejector 5.1 and the ammonia measurement cell 4.1. The shut-off valve 6.3, the vent valve 6.2 and the purge valve 6.1 are connected to the PLC control system outside the high-temperature chamber 1, and the opening and closing of the shut-off valve 6.3, the vent valve 6.2 and the purge valve 6.1 are controlled by the PLC control system. When the system needs to be purged, the shut-off valve 6.3 is closed, the vent valve 6.2 is opened, and then the purge valve 6.1 is opened. Compressed air sequentially passes through the ammonia measurement cell 4.1, the connecting pipe 4.2, the oxygen measurement cell 3.1 and the multi-component measurement cell 2.1, and finally is discharged to the outside of the high-temperature chamber 1 through the vent pipe to realize the purging of the system. When detecting flue gas, the shut-off valve 6.3 is opened, the vent valve 6.2 and the purge valve 6.1 are closed. After the pressure of the compressed air is regulated by the pressure stabilizing valve 5.5, the vacuum degree of the multi-component measurement cell 2.1 is stabilized, and it enters the ejector 5.1 through the heater 5.4, and extracts the flue gas and discharges it from the outlet pipe 5.3 of the ejector 5.1.

[0039] The temperature of the flue gas received by the sampling pipe 2.2 is higher than 230 °C during the transmission process. The outer end of the sampling pipe 2.2 is connected to a pre-dust removal device to filter the soot particles in the flue gas to be measured.

[0040] The shut-off valve 6.3 is a normally open valve. When the shut-off valve 6.3 is open, both the front and rear of the valve are in a negative pressure state; when closed, both the front and rear of the valve can withstand a pressure of 1 Mpa, and the valve body can withstand a temperature of more than 350 °C.

[0041] The vent valve 6.2 is a normally closed valve, and the valve body can withstand a temperature of more than 350 °C.

[0042] The wall thickness of the multi-component measurement cell 2.1 is not less than 2 mm. During the flue gas measurement, the pressure in the multi-component measurement cell 2.1 is maintained between -3 and -15 kpa.

[0043] The range of the vacuum gauge 2.3 is -50 kpa to 1000 kpa.

[0044] The NO dilution probe interface 2.4 is adapted to various types of NO dilution probes, and the NO dilution method measurement interface flange 2.5 is adapted to various types of NO dilution method measuring instruments; the NO direct extraction method measurement interface 2.6 is adapted to various types of NO direct extraction method measuring instruments; the CO measurement interface 2.7 is adapted to various types of direct extraction method CO analyzers; the other component measurement interface 2.8 is adapted to various types of other component measuring instruments; the oxygen measurement interface flange 3.2 is adapted to various types of zirconia measuring instruments, the extraction method ammonia measurement interface 11 is adapted to the extraction method ammonia test instruments, and the spectroscopic method ammonia measurement interface flange 4.4 is adapted to various types of laser spectroscopic extraction method ammonia test instruments. When measuring flue gas, each measuring instrument is connected to the corresponding interface without leakage, and the lining material in the ammonia measurement cell meets the requirements of the laser spectroscopic extraction method ammonia test instrument.

[0045] The purge valve 6.1 is a normally closed valve, and the valve body can withstand temperatures above 350°C.

[0046] The maximum suction flow rate of the ejector 5.1 is not less than 100 NL / min.

[0047] The maximum heating temperature of the heater 5.4 is not less than 230°C.

[0048] The inner diameters of the compressed air inlet pipe 5.2 and the outlet pipe 5.3 are not less than 10 mm, and the flow rate of the compressed air entering the compressed air inlet pipe 5.2 is 2 Nm³ / min.

[0049] The pressure before the pressure regulating valve 5.5 is 0.7 Mpa, and the adjustable pressure range after the valve is 0.1 - 0.7 Mpa.

[0050] The temperature inside the high-temperature chamber 1 is set between 260 - 350°C, which is similar to the temperature of the flue gas in the flue, so as to keep the flue gas true, thereby improving the accuracy of component detection. At the same time, it prevents water vapor condensation, causing component blockage, corrosion and analyzer failure. The high-temperature chamber 1 and the external environment adopt heat insulation measures, and its outer wall temperature is not higher than 50°C.

[0051] The sampling pipe 2.2, the shut-off valve 6.3, and the purge valve 6.1 are arranged adjacent to the inner wall of the high-temperature chamber 1. The NO dilution method measurement interface flange 2.5, the oxygen measurement interface flange 3.2, and the spectroscopic method ammonia measurement interface flange 4.4 are arranged on the inner wall of the high-temperature chamber 1. Each instrument such as the NO dilution method measuring instrument, the NO direct extraction method measuring instrument, the CO analyzer, the zirconia measuring instrument, the extraction method ammonia test instrument, and the laser spectroscopic extraction method ammonia test instrument is arranged outside the high-temperature chamber 1.

[0052] As a preferred method, each device of the flue gas multi-component measurement system is preferably made of stainless steel and can withstand temperatures above 350°C.

[0053] A method for using a flue gas multi-component measurement system includes the following steps:

[0054] Step 1: Instrument installation. Select the corresponding NO and NH3 measurement methods according to the measurement requirements. After determination, connect each measurement instrument to the corresponding measurement interface on the system one by one. Then check the airtightness of the connections of each instrument to avoid flue gas leakage. Open the shut-off valve 6.3 through the PLC control system, close the vent valve 6.2 and the purge valve 6.1, and zero-adjust each measurement instrument.

[0055] Step 2: Introduce compressed air. Adjust the heater 5.4 to heat the compressed air to above 230 °C. Adjust the pressure regulating valve 5.5 to make the compressed air enter the ejector 5.1 at a flow rate of 2 Nm³ / min to stabilize the pressure in the multi-component measurement cell 2.1 and keep it between -3 and -15 kPa.

[0056] Step 3: Measure the flue gas to be measured. Driven by the ejector 5.1, the flue gas to be measured enters from the sampling pipe 2.2, passes through the multi-component measurement cell 2.1, the oxygen measurement cell 3.1, the connecting pipe 4.2, and the ammonia measurement cell 4.1 in sequence, and finally is discharged to the outside of the high-temperature chamber 1 together with the compressed air from the outlet pipe 5.3 of the ejector 5.1. Each instrument extracts the flue gas for flue gas component detection and analysis.

[0057] Step 4: System purge. Close the shut-off valve 6.3 through the PLC control system, open the vent valve 6.2, and then open the purge valve 6.1. The compressed air passes through the ammonia measurement cell 4.1, the connecting pipe 4.2, the oxygen measurement cell 3.1, and the multi-component measurement cell 2.1 in sequence, and finally is discharged to the outside of the high-temperature chamber 1 from the vent pipe.

[0058] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for using a multi-component measurement system for flue gas, characterized in that: It includes the following steps: Step 1: Instrument installation. Select the NO and NH3 measurement methods according to the measurement requirements, then connect each measurement instrument to the corresponding measurement interface, check the airtightness of the system. After meeting the airtightness requirements, adjust the temperature of the high-temperature chamber (1), and then turn on the shut-off valve (6.3) through the PLC control system, close the evacuation valve (6.2) and the purge valve (6.1), and zero-adjust each measurement instrument; Step 2: Introduce compressed air. Adjust the temperature and flow rate of the compressed air entering the ejector (5.1) by adjusting the heater (5.4) and the pressure stabilizing valve (5.5) to stabilize the vacuum degree in the multi-component measurement cell (2.1); Step 3: Measurement of the flue gas to be measured. Driven by the ejector (5.1), the flue gas to be measured enters from the sampling pipe (2.2), and successively passes through the multi-component measurement cell (2.1), the oxygen measurement cell (3.1), the connecting pipe (4.2), and the ammonia measurement cell (4.1), and is discharged to the outside of the high-temperature chamber (1) together with the compressed air from the outlet pipe (5.3) of the ejector (5.1). Each instrument extracts the flue gas for detection and analysis of the flue gas components; Step 4: System purge. Close the shut-off valve (6.3) through the PLC control system, open the evacuation valve (6.2), and then open the purge valve (6.1). The compressed air successively passes through the ammonia measurement cell (4.1), the connecting pipe (4.2), the oxygen measurement cell (3.1), and the multi-component measurement cell (2.1), and is discharged to the outside of the high-temperature chamber (1) from the evacuation pipe; In the said Step 1, the temperature of the high-temperature chamber (1) is 260~350°C; The said flue gas multi-component measurement system includes a high-temperature chamber (1) and a multi-component measurement device (2), an oxygen measurement device (3), an ammonia measurement device (4), and a jet device (5) which are successively connected in series along the gas flow direction and arranged inside the high-temperature chamber (1); The said multi-component measurement device (2) includes a multi-component measurement cell (2.1) and a sampling pipe (2.2), a vacuum gauge (2.3), a NO dilution probe interface (2.4), a NO direct extraction method measurement interface (2.6), and a CO measurement interface (2.7) arranged on the multi-component measurement cell (2.1); The said oxygen measurement device (3) includes an oxygen measurement cell (3.1). The oxygen measurement cell (3.1) is connected to the multi-component measurement cell (2.1), and an oxygen measurement interface is arranged thereon; The said ammonia measurement device (4) includes an ammonia measurement cell (4.1). A spectroscopic ammonia measurement interface is arranged on the ammonia measurement cell (4.1). The ammonia measurement cell (4.1) is connected to the oxygen measurement cell (3.1) through a connecting pipe (4.2), and an extraction method ammonia measurement interface (4.3) is arranged on the connecting pipe (4.2); The said jet device (5) includes an ejector (5.1). The air inlet of the ejector (5.1) is connected to the ammonia measurement cell (4.1), an outlet pipe (5.3) is arranged at its air outlet, and a compressed air inlet pipe (5.2) is arranged at the jet orifice. A heater (5.4) and a pressure stabilizing valve (5.5) are arranged on the compressed air inlet pipe (5.2); The outer ends of the sample injection tube (2.2), the gas outlet tube (5.3), and the compressed air inlet tube (5.2) all extend outside the high-temperature chamber (1).

2. The method for using a multi-component flue gas measurement system according to claim 1, characterized in that: It further includes a purging device (6), and the purging device (6) is connected to the PLC control system. The purging device includes a purge valve (6.1), a vent valve (6.2), and a shut-off valve (6.3). The purge valve (6.1) is arranged between the injector (5.1) and the ammonia measurement cell (4.1); the shut-off valve (6.3) is arranged on the sample injection tube (2.2); a vent pipe is arranged on the sample injection tube (2.2) between the shut-off valve (6.3) and the multi-component measurement cell (2.1), and the vent valve (6.2) is arranged on the vent pipe.

3. The usage method of a multi-component flue gas measurement system according to claim 1, wherein: At the position corresponding to the NO dilution probe interface (2.4) on the inner wall of the high-temperature chamber (1), an NO dilution method measurement interface flange (2.5) is provided; the oxygen measurement interface is an oxygen measurement interface flange (3.2); the spectroscopic ammonia measurement interface is a spectroscopic ammonia measurement interface flange (4.4).

4. The usage method of a multi-component flue gas measurement system according to claim 1, characterized in that: The multi-component measurement cell (2.1) is provided with other component measurement interfaces (2.8).

5. The usage method of a multi-component flue gas measurement system according to claim 1, characterized in that: The outer end of the sample injection tube (2.2) is connected to a pre-dust removal device.

6. The usage method of a multi-component flue gas measurement system according to claim 3, characterized in that: The NO dilution method measurement interface flange (2.5), the oxygen measurement interface flange (3.2), and the spectroscopic ammonia measurement interface flange (4.4) are all arranged on the inner wall of the high-temperature chamber (1).

7. The usage method of a multi-component flue gas measurement system according to claim 2, characterized in that: The outer end of the vent pipe extends outside the high-temperature chamber (1).

8. The usage method of a multi-component flue gas measurement system according to claim 1, characterized in that: In the second step, the pressure in the multi-component measurement cell (2.1) is -3 to -15 kPa; the flow rate of the compressed air entering the injector (5.1) is 2 Nm³ / min, and the temperature is 260 °C.

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