CN114608898A - Flue gas multi-component measurement system and use method - Google Patents
Flue gas multi-component measurement system and use method Download PDFInfo
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- CN114608898A CN114608898A CN202210225956.6A CN202210225956A CN114608898A CN 114608898 A CN114608898 A CN 114608898A CN 202210225956 A CN202210225956 A CN 202210225956A CN 114608898 A CN114608898 A CN 114608898A
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- 238000005259 measurement Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 42
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003546 flue gas Substances 0.000 title claims abstract description 38
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 144
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 72
- 239000001301 oxygen Substances 0.000 claims abstract description 50
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000779 smoke Substances 0.000 claims abstract description 38
- 239000000523 sample Substances 0.000 claims abstract description 36
- 238000000605 extraction Methods 0.000 claims abstract description 27
- 238000001228 spectrum Methods 0.000 claims abstract description 23
- 238000004458 analytical method Methods 0.000 claims abstract description 15
- 238000010790 dilution Methods 0.000 claims abstract description 12
- 239000012895 dilution Substances 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000010926 purge Methods 0.000 claims description 30
- 238000003113 dilution method Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical group O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 239000000428 dust Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- 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
- 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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
-
- 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
- G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
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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
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0054—Ammonia
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- 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
- G01N2001/2264—Sampling from a flowing stream of gas with dilution
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- 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
- G01N2001/227—Sampling from a flowing stream of gas separating gas from solid, e.g. filter
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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
- G01N33/0011—Sample conditioning
- G01N33/0018—Sample conditioning by diluting a gas
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Abstract
The invention discloses a flue gas multi-component measuring system and a using method thereof, wherein the system comprises a high-temperature chamber, and a multi-component measuring device, an oxygen measuring device, an ammonia measuring device and a jet device which are arranged in the high-temperature chamber; the multi-component measuring device comprises a multi-component measuring pool, and a sample inlet pipe, a vacuum meter, an NO dilution probe interface, an NO direct-pumping method measuring interface and a CO measuring interface which are sequentially arranged on the multi-component measuring pool; the oxygen measuring device comprises an oxygen measuring pool, and an oxygen measuring interface is arranged on the oxygen measuring pool; the ammonia gas measuring device comprises an ammonia measuring pool, a spectrum ammonia measuring interface is arranged on the ammonia measuring pool, a connecting pipe is arranged between the ammonia measuring pool and the oxygen measuring pool, and an extraction method ammonia measuring interface is arranged on the connecting pipe; the fluidic device comprises a fluidic ejector. The smoke to be measured is introduced through the sample inlet pipe, so that the smoke sources measured by the component measuring instruments are consistent, the flow rates are the same, the measurement error is effectively reduced, and the measurement and analysis difficulties caused by different smoke sources are avoided.
Description
Technical Field
The invention belongs to the technical field of gaseous pollutant measurement, and particularly relates to a flue gas multi-component measurement system and a using method thereof.
Background
Along with the improvement of ultra-low emission of flue gas denitration of coal-fired power plants, the denitration efficiency is gradually improved, the ammonia escape is also gradually improved, because the ammonia escape has harmfulness to an air preheater and a tail flue, each power plant has higher requirements on the adjustment of the uniformity of NOx at a denitration outlet, the efficiency control of a coal-fired boiler needs to measure the CO component of the flue gas, along with the development of science and technology, various requirements can be met in the measurement of the CO component of the flue gas, currently, each flue gas component measuring interface is uniformly distributed on the wall of a flue, and the measuring sample gas of each instrument is a non-same source, thereby bringing certain trouble to data analysis; when the types of components needing to be measured are increased, a measuring interface is arranged on the flue wall, the flue wall needs to be processed and modified, and the installation of instruments is complex; the flow velocity of the flue gas in the flue is unstable, and the pressure difference of the flue gas passing through each analysis meter is large, so that the detection errors of the analysis meters are caused; flue gas in the flue is untreated, more smoke particles exist, each instrument is directly connected with the flue, the work load of the probe filter element is large, and the service life and the effective working time are influenced. Therefore, the flue gas multi-component measurement system provided by the invention can be used for preventing different sample gases from being extracted in the flue gas analysis process, and the sample gases have the same and simultaneous properties in the flue gas component analysis, thereby having important significance in denitration flue gas component analysis and stable operation of a boiler.
Disclosure of Invention
The invention aims to provide a flue gas multi-component measurement system and a using method thereof, and aims to solve the problems that in the background art, measurement sources of components of denitration flue gas are not uniform, the flow rate of the flue gas is unstable, measurement data are difficult to analyze and process, and interfaces are difficult to arrange on the wall of a flue.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-component smoke measuring system comprises a high-temperature chamber, and a multi-component measuring device, an oxygen measuring device, an ammonia measuring device and a jet device which are arranged in the high-temperature chamber and sequentially communicated from front to back along the gas flow direction;
the multi-component measuring device comprises a multi-component measuring pool, and a sample inlet pipe, a vacuum meter, an NO dilution probe interface, an NO direct-pumping method measuring interface and a CO measuring interface which are arranged on the multi-component measuring pool;
the oxygen measuring device comprises an oxygen measuring cell, the oxygen measuring cell is communicated with the multi-component measuring cell, and an oxygen measuring interface is arranged on the oxygen measuring cell;
the ammonia gas measuring device comprises an ammonia measuring tank, wherein a spectrum ammonia measuring interface is arranged on the ammonia measuring tank, the ammonia measuring tank is communicated with an oxygen measuring tank through a connecting pipe, and an extraction-method ammonia measuring interface is arranged on the connecting pipe;
the jet device comprises a jet device, wherein the air inlet of the jet device is connected with the ammonia measuring tank, the air outlet of the jet device is provided with an air outlet pipe, the air jet opening is provided with a compressed air inlet pipe, and the compressed air inlet pipe is provided with a heater and a pressure stabilizing valve;
the outer ends of the sample inlet pipe, the air outlet pipe and the compressed air inlet pipe extend out of the high-temperature chamber.
The device further comprises a purging device, the purging device is connected with the PLC control system and comprises a purging valve, an exhaust valve and a shut-off valve, and the purging valve is arranged between the ejector and the ammonia measuring pool; the shutoff valve is arranged on the sample inlet pipe; and an emptying pipe is arranged on the sample inlet pipe between the shutoff valve and the multi-component measuring pool, and the emptying valve is arranged on the emptying pipe.
Further, an NO dilution method measuring interface flange is arranged on the inner wall of the high-temperature chamber corresponding to the NO dilution probe interface; the oxygen measuring interface is an oxygen measuring interface flange; the spectrum ammonia measurement interface is a spectrum ammonia measurement interface flange.
Furthermore, other component measurement interfaces are arranged on the multi-component measurement pool.
Furthermore, the outer end of the sampling pipe is connected with a pre-dust removal device.
Further, the NO dilution method measuring interface flange, the oxygen measuring interface flange and the spectrum method ammonia measuring interface flange are all arranged on the inner wall of the high-temperature chamber.
Further, the outer end of the emptying pipe extends out of the high-temperature chamber.
The smoke multi-component measuring method by using the smoke multi-component measuring system comprises the following steps:
step one, installing an instrument, and selecting NO and NH according to measurement requirements3The measurement mode is that each measurement instrument is connected with a corresponding measurement interface, the air tightness of the system is checked, the temperature of the high-temperature chamber is adjusted after the air tightness requirement is met, the shut-off valve is opened through the PLC control system, the emptying valve and the purging valve are closed, and zero setting is carried out on each measurement instrument;
secondly, introducing compressed air, and regulating the temperature and the flow of the compressed air entering the ejector by regulating a heater and a pressure stabilizing valve to stabilize the vacuum degree in the multi-component measuring pool;
measuring smoke to be measured, wherein the smoke to be measured enters from a sample inlet pipe under the drive of an ejector, sequentially passes through a multi-component measuring pool, an oxygen measuring pool, a connecting pipe and an ammonia measuring pool, is discharged to the outside of the high-temperature chamber together with compressed air from an air outlet pipe of the ejector, and is extracted by each instrument to perform smoke component detection and analysis;
and fourthly, purging the system, namely closing a shut-off valve through the PLC control system, opening an exhaust valve, then opening a purge valve, and discharging the compressed air to the outside of the high-temperature chamber from an exhaust pipe through an ammonia measuring pool, a connecting pipe, an oxygen measuring pool and a multi-component measuring pool in sequence.
Further, in the first step, the temperature of the high-temperature chamber is 260-350 ℃.
Further, in the second step, the pressure in the multi-component measuring pool is-3 to-15 kpa; the flow of compressed air into the ejector was 2 Nm/min at a temperature of 260 ℃.
The invention has the following beneficial effects:
1. according to the smoke multi-component measuring system and the using method provided by the invention, smoke to be measured is introduced through the sampling pipe, so that the smoke sources measured by the component measuring instruments are consistent, the whole measuring process is carried out in a high-temperature chamber, the smoke fidelity is realized, the measuring error is reduced, and the difficulty in measurement and analysis caused by different smoke sources is avoided.
2. The invention provides a flue gas multi-component measurement system and a using method thereof, which realize the compatibility of two detection methods of an NO dilution method and a direct extraction method by arranging an NO dilution method measurement interface flange and an NO direct extraction method measurement interface, and realize NH by arranging an extraction method ammonia measurement interface and a spectrum method ammonia measurement interface flange3The extraction method and the laser spectrum extraction method are compatible, and when the detection precision requirement is higher, the two methods can be adopted for NO and NH3And synchronous measurement is carried out, the precision of a detection result is improved, different measurement requirements can be met, and the application scene is wide.
3. According to the flue gas multi-component measurement system and the use method, the situation that a plurality of instrument interfaces are arranged on the flue gas duct wall is avoided, the operation is simple and convenient, the installation cost is saved, the detection efficiency is improved, meanwhile, the flue gas contacted by each detection instrument is the flue gas after smoke dust is filtered, the work load of each probe filter element is greatly reduced, and the service life and the effective working time of each measurement instrument are effectively prolonged.
4. According to the flue gas multi-component measurement system and the using method, the pressure stabilizing valve is controlled to enable compressed air to enter the system at a stable flow rate, so that the problem that the flow rate of flue gas is unstable, the pressure difference of the flue gas passing through an analysis instrument is large, the detection error of the analysis instrument is avoided, and the accuracy of a detection result is improved.
Drawings
FIG. 1 is a schematic flow diagram of a smoke multi-component measurement system according to the present invention.
In the figure: 1-high temperature chamber, 2-multicomponent measuring device, 2.1-multicomponent measuring cell, 2.2-sample inlet tube, 2.3-vacuum meter, 2.4-NO dilution probe interface, 2.5-NO dilution method measuring interface flange, 2.6-NO direct drawing method measuring interface, 2.7-CO measuring interface, 2.8-other component measuring interface, 3-oxygen measuring device, 3.1-oxygen measuring cell, 3.2-oxygen measuring interface flange, 4-ammonia measuring device, 4.1-ammonia measuring cell, 4.2-connecting tube, 4.3-drawing method ammonia measuring interface, 4.4-spectroscopy ammonia measuring interface flange, 5-fluidic device, 5.1-fluidic device, 5.2-compressed air inlet tube, 5.3-air outlet tube, 5.4-heater, 5.5-pressure stabilizing valve, 6-purging device, 5-jet device, 5.5-jet device, 5-jet device, and the like, 6.1-purge valve, 6.2-evacuation valve, 6.3-shutoff valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the multi-component flue gas measurement system provided by the invention comprises 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 arranged in the high-temperature chamber 1 and sequentially communicated from front to back along the gas flow direction, wherein the measurement system is controlled and adjusted by a PLC control system.
The multi-component measuring device 2 comprises a multi-component measuring pool 2.1, a sample inlet pipe 2.2, a vacuum meter 2.3, an NO dilution probe interface 2.4, an NO direct-pumping method measuring interface 2.6, a CO measuring interface 2.7 and other component measuring interfaces 2.8 which are sequentially arranged on the multi-component measuring pool 2.1, wherein the NO dilution probe interface 2.4 is used for connecting an NO dilution probe, an NO dilution method measuring interface flange 2.5 is arranged on the other side of the dilution probe, and the NO dilution method measuring interface flange 2.5 is used for connecting an NO dilution method measuring instrument. The NO direct pumping method measuring interface 2.6 is used for connecting an NO direct pumping method measuring instrument, and the CO measuring interface 2.7 is used for connecting a direct pumping method CO analysis instrument.
The oxygen measuring device 3 comprises an oxygen measuring cell 3.1, the oxygen measuring cell 3.1 is communicated with a multi-component measuring cell 2.1, one end of the oxygen measuring cell is provided with an oxygen measuring interface flange 3.2, the oxygen measuring interface flange 3.2 is used for connecting an oxygen measuring instrument, and the oxygen measuring instrument is preferably a zirconia measuring instrument.
The ammonia gas measuring device 4 comprises an ammonia measuring tank 4.1, the two ends of the ammonia measuring tank 4.1 are respectively provided with a spectrum ammonia measuring interface flange 4.4, the spectrum ammonia measuring interface flange 4.4 is used for connecting a laser spectrum extraction method ammonia measuring instrument, a connecting pipe 4.2 is arranged between the ammonia measuring tank 4.1 and an oxygen measuring tank 3.1, an extraction method ammonia measuring interface 4.3 is arranged on the connecting pipe 4.2, and the extraction method ammonia measuring interface 4.3 is used for connecting an extraction method ammonia measuring instrument.
The jet device 5 comprises a jet device 5.1, an air inlet of the jet device 5.1 is connected with an ammonia measuring tank 4.1, a compressed air inlet pipe 5.2 is arranged at an air jet port, the outer end of the compressed air inlet pipe 5.2 is arranged outside the high-temperature chamber 1, a heater 5.4 and a pressure stabilizing valve 5.5 are arranged on the compressed air inlet pipe 5.2 outside the high-temperature chamber 1 from inside to outside, compressed air enters from the compressed air inlet pipe 5.2, is regulated by the pressure stabilizing valve 5.5 and then enters the jet device 5.1 after being heated by the heater 5.4, an air outlet pipe 5.3 is arranged at an air outlet of the jet device 5.1, and the outer end of the air outlet pipe 5.3 is arranged outside the high-temperature chamber 1.
Flue gas to be detected enters from a sample inlet pipe 2.2, sequentially passes through a multi-component measuring cell 2.1, an oxygen measuring cell 3.1, a connecting pipe 4.2 and an ammonia measuring cell 4.1, and is discharged out of a high-temperature chamber 1 together with compressed air from an air outlet pipe 5.3 of an ejector 5.1, and the flue gas is extracted by various instruments such as an NO dilution method measuring instrument, an NO direct extraction method measuring instrument, a CO analysis instrument, a zirconium oxide measuring instrument, an extraction method ammonia measuring instrument, a laser spectrum extraction method ammonia measuring instrument and the like through an NO dilution method measuring interface flange 2.5, an NO direct extraction method measuring interface 2.6, a CO measuring interface 2.7, an oxygen measuring interface flange 3.2, an extraction method ammonia measuring interface 4.3, a spectrum method ammonia measuring interface flange 4.4 and other component measuring interfaces 2.8 to be detected and analyzed. By setting NO dilution method measuring interfaceThe flange 2.5 and the NO direct extraction method measuring interface 2.6 realize the compatibility of two detection methods of an NO dilution method and a direct extraction method, and the NH is realized by arranging an extraction method ammonia measuring interface 4.3 and a spectrum method ammonia measuring interface flange 4.43The extraction method and the laser spectrum extraction method are compatible, and when the detection precision requirement is higher, the two methods can be adopted for NO and NH3And synchronous measurement is carried out, the precision of a detection result is improved, different measurement requirements can be met, and the application scene is wide. Through predetermineeing measurement interface, reduce the instrumentation installation degree of difficulty, promote detection efficiency.
The flue gas multi-component measurement system further comprises a purging device 6, wherein the purging device 6 comprises a purging valve 6.1, an emptying valve 6.2 and a shut-off valve 6.3, the shut-off valve 6.3 is arranged on a sample inlet pipe 2.2, an emptying pipe is arranged on the sample inlet pipe 2.2 between the shut-off valve 6.3 and the multi-component measurement pool 2.1, the outer end of the emptying pipe is arranged outside the high-temperature chamber 1, and the emptying pipe outside the high-temperature chamber 1 is provided with the emptying valve 6.2; a purge valve 6.1 is arranged between the ejector 5.1 and the ammonia measuring tank 4.1, a shut-off valve 6.3, an exhaust valve 6.2 and the purge valve 6.1 are connected with a PLC control system outside the high-temperature chamber 1, and the shut-off valve 6.3, the exhaust valve 6.2 and the purge valve 6.1 are controlled to be opened and closed through the PLC control system. When the system needs to be purged, the shut-off valve 6.3 is closed, the emptying valve 6.2 is opened, then the purging valve 6.1 is opened, compressed air sequentially passes through the ammonia measuring pool 4.1, the connecting pipe 4.2, the oxygen measuring pool 3.1 and the multi-component measuring pool 2.1, and finally is discharged out of the high-temperature chamber 1 from the emptying pipe, so that purging of the system is realized. When the smoke is detected, the shutoff valve 6.3 is opened, the emptying valve 6.2 and the purging valve 6.1 are closed, the vacuum degree of the multi-component measuring pool 2.1 is stabilized after the pressure of compressed air is regulated by the pressure stabilizing valve 5.5, the compressed air enters the ejector 5.1 through the heater 5.4, and the smoke is extracted and discharged from the air outlet pipe 5.3 of the ejector 5.1.
The temperature of the flue gas received by the sample inlet pipe 2.2 is higher than 230 ℃ in the transmission process, and the outer end of the sample inlet pipe 2.2 is connected with a pre-dedusting device to filter the smoke dust particles in the flue gas to be tested.
The shut-off valve 6.3 is a normally open valve, and when the shut-off valve 6.3 is opened, the front and the rear of the valve are in a negative pressure state; when the valve is closed, the pressure of 1Mpa can be borne before and after the valve, and the valve body can resist the temperature of more than 350 ℃.
The emptying valve 6.2 is a normally closed valve, and the valve body can resist the temperature of more than 350 ℃.
The wall thickness of the multi-component measuring cell 2.1 is not less than 2mm, and the pressure in the multi-component measuring cell 2.1 is kept between-3 and-15 kpa in smoke measurement.
The range of the vacuum meter 2.3 is-50 kpa to 1000 kpa.
The NO dilution probe interface 2.4 is adapted to various NO dilution probes, and the NO dilution method measuring interface flange 2.5 is adapted to various NO dilution method measuring instruments; the NO direct pumping method measuring interface 2.6 is adapted to various types of NO direct pumping method measuring instruments; the CO measuring interface 2.7 is adapted to various types of direct extraction CO analysis instruments; the other component measuring interface 2.8 is adapted to various other component measuring instruments; the oxygen measuring interface flange 3.2 is adapted to various types of zirconia measuring instruments, the extraction method ammonia measuring interface 11 is adapted to an extraction method ammonia testing instrument, and the spectrum method ammonia measuring interface flange 4.4 is adapted to various types of laser spectrum extraction method ammonia testing instruments. When measuring the flue gas, each measuring instrument is correspondingly connected with each interface and has no leakage, and the lining substance in the ammonia measuring tank meets the requirements of the ammonia measuring instrument by a laser spectrum extraction method.
The purge valve 6.1 is a normally closed valve, and the valve body can resist the temperature of more than 350 ℃.
The maximum suction flow of the ejector 5.1 is not lower than 100 NL/min.
The maximum heating temperature of the heater 5.4 is not lower than 230 ℃.
The inner diameters of the pipelines of the compressed air inlet pipe 5.2 and the air outlet pipe 5.3 are not less than 10mm, and the flow rate of compressed air entering the compressed air inlet pipe 5.2 is 2 Nm/min.
The pressure stabilizing valve 5.5 has the pressure of 0.7Mpa before the valve and the adjustable pressure interval of 0.1-0.70.7 Mpa after the valve.
The temperature in the high-temperature chamber 1 is set to be 260-350 ℃, the temperature is close to the temperature of the flue gas in the flue, the flue gas is guaranteed to be true, the component detection accuracy is further improved, meanwhile, water vapor condensation is prevented, component blockage, corrosion and failure of an analytical instrument are caused, heat insulation measures are taken for the high-temperature chamber 1 and the external environment, and the temperature of the outer wall of the high-temperature chamber is not higher than 50 ℃.
The sampling pipe 2.2, the shut-off valve 6.3 and the purging valve 6.1 are arranged close to the inner wall of the high-temperature chamber 1, the NO dilution method measuring interface flange 2.5, the oxygen measuring interface flange 3.2 and the spectrum method ammonia measuring interface flange 4.4 are arranged on the inner wall of the high-temperature chamber 1, and the NO dilution method measuring instrument, the NO direct-pumping method measuring instrument, the CO analysis instrument, the zirconia measuring instrument, the pumping method ammonia measuring instrument, the laser spectrum pumping method ammonia measuring instrument and other instruments are arranged outside the high-temperature chamber 1.
As a preferred mode, each device of the flue gas multi-component measuring system is preferably made of stainless steel, and the whole temperature resistance is over 350 ℃.
The use method of the smoke multi-component measuring system comprises the following steps:
the method comprises the following steps: installing instruments, selecting corresponding NO and NH according to measurement requirements3And (3) a measurement mode, namely connecting each measurement instrument to a corresponding measurement interface on the system one by one after the determination, then checking the air tightness of the connection of each instrument to avoid the leakage of the flue gas, opening a shutoff valve 6.3, closing an exhaust valve 6.2 and a purge valve 6.1 through a PLC (programmable logic controller) control system, and zeroing each measurement instrument.
Step two: introducing compressed air, adjusting a heater 5.4 to heat the compressed air to over 230 ℃, adjusting a pressure stabilizing valve 5.5 to enable the compressed air to enter an ejector 5.1 at a flow rate of 2 Nm/min, and stabilizing the pressure in the multi-component measuring pool 2.1 to keep the pressure in a range of-3 to-15 kpa.
Step three: measuring smoke to be measured, wherein the smoke to be measured enters from the sample inlet pipe 2.2 under the drive of the ejector 5.1, sequentially passes through the multi-component measuring tank 2.1, the oxygen measuring tank 3.1, the connecting pipe 4.2 and the ammonia measuring tank 4.1, is finally discharged out of the high-temperature chamber 1 together with compressed air from the air outlet pipe 5.3 of the ejector 5.1, and is extracted by each instrument for smoke component detection and analysis.
Step four: and (3) system purging, namely closing a shut-off valve 6.3 through a PLC control system, opening an exhaust valve 6.2, then opening a purge valve 6.1, sequentially passing compressed air through an ammonia measuring pool 4.1, a connecting pipe 4.2, an oxygen measuring pool 3.1 and a multi-component measuring pool 2.1, and finally discharging the compressed air out of the high-temperature chamber 1 from the exhaust pipe.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A flue gas multi-component measurement system is characterized in that: comprises a high-temperature chamber (1), and a multi-component measuring device (2), an oxygen measuring device (3), an ammonia measuring device (4) and a jet device (5) which are arranged in the high-temperature chamber (1) and sequentially communicated from front to back along the gas flow direction;
the multi-component measuring device (2) comprises a multi-component measuring pool (2.1), a sample inlet pipe (2.2) arranged on the multi-component measuring pool (2.1), a vacuum meter (2.3), an NO dilution probe interface (2.4), an NO direct-pumping measuring interface (2.6) and a CO measuring interface (2.7);
the oxygen measuring device (3) comprises an oxygen measuring cell (3.1), the oxygen measuring cell (3.1) is communicated with the multi-component measuring cell (2.1), and an oxygen measuring interface is arranged on the oxygen measuring cell;
the ammonia gas measuring device (4) comprises an ammonia measuring tank (4.1), a spectrum ammonia measuring interface is arranged on the ammonia measuring tank (4.1), the ammonia measuring tank (4.1) is communicated with an oxygen measuring tank (3.1) through a connecting pipe (4.2), and an extraction ammonia measuring interface (4.3) is arranged on the connecting pipe (4.2);
the jet device (5) comprises a jet device (5.1), the air inlet of the jet device (5.1) is connected with the ammonia measuring pool (4.1), the air outlet of the jet device is provided with an air outlet pipe (5.3), the air jet opening is provided with a compressed air inlet pipe (5.2), and the compressed air inlet pipe (5.2) is provided with a heater (5.4) and a pressure stabilizing valve (5.5);
the outer ends of the sample inlet pipe (2.2), the air outlet pipe (5.3) and the compressed air inlet pipe (5.2) extend out of the high-temperature chamber (1).
2. The smoke multi-component measurement system according to claim 1, wherein: the ammonia measuring device is characterized by further comprising a purging device (6), wherein the purging device (6) is connected with the PLC control system and comprises a purging valve (6.1), an emptying valve (6.2) and a shut-off valve (6.3), and the purging valve (6.1) is arranged between the ejector (5.1) and the ammonia measuring pool (4.1); the shut-off valve (6.3) is arranged on the sample inlet pipe (2.2); an emptying pipe is arranged on the sampling pipe (2.2) between the shut-off valve (6.3) and the multi-component measuring pool (2.1), and the emptying valve (6.2) is arranged on the emptying pipe.
3. The smoke multi-component measurement system according to claim 1, wherein: an NO dilution method measuring interface flange (2.5) is arranged on the inner wall of the high-temperature chamber (1) at a position corresponding to the NO dilution probe interface (2.4); the oxygen measuring interface is an oxygen measuring interface flange (3.2); the spectrum ammonia measurement interface is a spectrum ammonia measurement interface flange (4.4).
4. The smoke multi-component measurement system according to claim 1, wherein: and other component measuring interfaces (2.8) are arranged on the multi-component measuring pool (2.1).
5. The smoke multi-component measurement system according to claim 1, wherein: the outer end of the sampling pipe (2.2) is connected with a pre-dust-removing device.
6. The smoke multi-component measurement system according to claim 3, wherein: the NO dilution method measurement interface flange (2.5), the oxygen measurement interface flange (3.2) and the spectrum method ammonia measurement interface flange (4.4) are all arranged on the inner wall of the high-temperature chamber (1).
7. The smoke multi-component measurement system according to claim 2, wherein: the outer end of the emptying pipe extends out of the high-temperature chamber (1).
8. The use method of the smoke multi-component measuring system according to any one of the claims 1 to 7, wherein: the method comprises the following steps:
step one, installing an instrument, and selecting NO and NH according to measurement requirements3The measurement mode is that each measurement instrument is connected with a corresponding measurement interface, the air tightness of the system is checked, the temperature of the high-temperature chamber (1) is adjusted after the air tightness requirement is met, the shut-off valve (6.3) is opened through the PLC control system, the emptying valve (6.2) and the purging valve (6.1) are closed, and zero setting is carried out on each measurement instrument;
secondly, introducing compressed air, and regulating the temperature and the flow of the compressed air entering the ejector (5.1) through a regulating heater (5.4) and a pressure stabilizing valve (5.5) to stabilize the vacuum degree in the multi-component measuring pool (2.1);
measuring smoke to be measured, wherein the smoke to be measured enters from a sample inlet pipe (2.2) under the drive of an ejector (5.1), sequentially passes through a multi-component measuring pool (2.1), an oxygen measuring pool (3.1), a connecting pipe (4.2) and an ammonia measuring pool (4.1), is discharged to the outside of a high-temperature chamber (1) together with compressed air from an air outlet pipe (5.3) of the ejector (5.1), and is extracted by each instrument to perform smoke component detection and analysis;
and fourthly, purging the system, namely closing a shut-off valve (6.3) through a PLC control system, opening an exhaust valve (6.2), then opening a purge valve (6.1), sequentially passing compressed air through an ammonia measuring pool (4.1), a connecting pipe (4.2), an oxygen measuring pool (3.1) and a multi-component measuring pool (2.1), and discharging the compressed air out of the high-temperature chamber (1) from the exhaust pipe.
9. The use method of the smoke multi-component measuring system according to claim 8, wherein the smoke multi-component measuring system comprises the following steps: in the first step, the temperature of the high-temperature chamber (1) is 260-350 ℃.
10. The use method of the smoke multi-component measuring system according to claim 8, wherein the method comprises the following steps: in the second step, the pressure in the multi-component measuring pool (2.1) is-3 to-15 kpa; the flow of compressed air into the ejector (5.1) was 2 Nm/min at a temperature of 260 ℃.
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