CN108333004B - Flue gas extraction system and flue gas extraction method applied to ammonia escape detection - Google Patents
Flue gas extraction system and flue gas extraction method applied to ammonia escape detection Download PDFInfo
- Publication number
- CN108333004B CN108333004B CN201810229803.2A CN201810229803A CN108333004B CN 108333004 B CN108333004 B CN 108333004B CN 201810229803 A CN201810229803 A CN 201810229803A CN 108333004 B CN108333004 B CN 108333004B
- Authority
- CN
- China
- Prior art keywords
- extraction
- flue
- electromagnetic valve
- pipeline
- compressed air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 141
- 238000000605 extraction Methods 0.000 title claims abstract description 128
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 70
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 88
- 239000003546 flue gas Substances 0.000 title claims description 88
- 238000005070 sampling Methods 0.000 claims abstract description 89
- 239000000779 smoke Substances 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims description 56
- 238000010926 purge Methods 0.000 claims description 17
- 238000011010 flushing procedure Methods 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 239000003517 fume Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 2
- 239000003054 catalyst Substances 0.000 abstract description 14
- 238000005507 spraying Methods 0.000 abstract description 9
- 150000003863 ammonium salts Chemical class 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 5
- 230000008025 crystallization Effects 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract 1
- 206010037544 Purging Diseases 0.000 description 12
- 239000000428 dust Substances 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 6
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a smoke extraction system and a smoke extraction method applied to ammonia escape detection, wherein the smoke extraction system comprises a smoke sampling device and an extraction power device, and further comprises an anti-blocking device, the smoke sampling device comprises a plurality of extraction heads which are distributed in a rectangular mode in the cross section of a flue in equal area, the plurality of extraction heads are communicated with a gas mixture mother tank through sampling pipelines, the sampling pipelines are communicated with the gas mixture mother tank and the anti-blocking device in parallel, valves are arranged on the sampling pipelines, and the extraction power device is connected with the gas mixture mother tank. The invention can accurately detect the quantity of ammonia and NOx at the outlet of the SCR reactor, spray ammonia according to the mole ratio of ammonia to NOx, avoid excessive ammonia spraying, reduce ammonium salt crystallization and solve the problem of air preheater blockage. The cleaning and maintenance cost of a large pen is saved. The formation of ammonium salt crystals on and near the surface of the catalyst is avoided, and the service life of the catalyst is prolonged. The anti-blocking device can prevent the whole system from being blocked and damaged, and ensure the operation reliability and the service life of one-time operation.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to a flue gas extraction system and a flue gas extraction method applied to ammonia escape detection.
Background
According to the national environmental protection requirement, the coal-fired boiler needs to experimentally implement ultra-low emission (NO in the discharged flue gas X ≤50mg、SO 2 Less than or equal to 35mg and the dust concentration less than or equal to 5 mg). At present, the main stream of the coal-fired boiler adopts SCR ammonia denitration, namely selective catalytic reduction denitration technology. It means that in the presence of catalyst and oxygen, the reducing agent ammonia (anhydrous ammonia, ammonia water or urea pyrolysis) can be selectively reacted with NOx in the flue gas to produce harmless nitrogen and water in the temperature range of 320-427 deg.C.
There is a very important index in SCR denitration technology. I.e. the amount of ammonia injected is appropriate to the NOx ratio in the flue gas. The ammonia quantity to be sprayed in the ideal situation can just completely react with the NOx in the flue gas. Neither excessive nor absent. While for environmentally friendly emissions not to exceed the standard, it is generally desirable that the amount of ammonia be slightly more than the amount of NOx. The NOx can be reacted completely, but if the ammonia is excessive, a plurality of problems are caused, such as blockage and corrosion of the air preheater, reduction of the activity of the catalyst, and blockage and corrosion of downstream equipment. Therefore, the detection and control of the ammonia amount are a very important key link in the SCR denitration technology. And monitoring the ammonia content in the flue gas is ammonia slip.
The basic principle of the ammonia escape device is LasIR gas analyzer based on TDLAS (tunable diode laser absorption spectrum, short for laser method) technology, and the common ammonia escape device adopts a laser correlation mode, a laser source is additionally arranged in a flue, and the content of ammonia in flue gas on a certain line (the optical path through which laser penetrates) in the flue is detected.
However, because the ammonia escape device is installed on the original flue gas flue, the flue gas pipeline runs at high temperature, and the temperature is also changed at random, so that the expansion deformation of the flue is indefinite, the laser correlation beam is deviated, and multiple maintenance and focusing are needed. The optical path of the laser beam is a certain line in the flue, the installation position of the ammonia escape device is generally at the section from the outlet of the SCR reactor to the inlet of the air preheater, the flue has large area and no straight pipe section, so that the flue gas flow field is disordered, the ammonia escape device at the outlet of the SCR is arranged at one corner of the flue, the ammonia content of the flue gas cannot be represented, meanwhile, the monitoring of the NOx at the outlet of the SCR reactor is also carried out by finding one point in the flue 21 with a large area, and the average NOx value of the flue gas cannot be represented. This presents a number of problems for the operation and production of the equipment of the enterprise:
1. because the monitoring of ammonia and NOx at the outlet of the SCR reactor is inaccurate, the mole ratio of ammonia to NOx can not be determined, and the mole ratio can only be determined according to the NO at the exhaust outlet of the flue gas X The amount of ammonia is determined, automatic ammonia spraying cannot be formed, and manual ammonia spraying can only increase labor cost and uncertain factors for the operation of the unit.
2. Because the ammonia slip (the value of ammonia at the outlet of the SCR reactor) is not accurately measured, most enterprises in control adopt manual ammonia spraying, the ammonia slip amount is usually too large in order to prevent the environmental emission from exceeding the standard, and the excessive ammonia and SO in the flue gas 2 Ammonia bisulfate is produced.
And when the flue gas passes through the air preheater, the temperature of the flue gas is also lower than the boiling point of the ammonia bisulfate and even lower than the melting point of the ammonia bisulfate because of heat exchange. Ammonium salt crystals can be formed on the surface of the air preheater, so that the air preheater can be corroded, the air preheater can be blocked, and particularly, the hydrogen sulfate ammonia in a molten state and dust in flue gas can form and form firm scaling, so that the air preheater can not be cleaned almost. Not only the coal consumption of the boiler is increased, but also the air preheater is cleaned after a period of operation, the cost for cleaning the air preheater is at least 40 ten thousand RMB at a time, and the air preheater may need to be replaced under severe conditions.
3. NH in SCR reactor 3 Is selectively preferential to NO under the action of catalyst X Reaction to produce H 2 O and N 2 In order to improve the efficiency of the catalyst, the catalyst is generally in a dense structure so as to increase the contact area with the flue gas, and if the spraying amount of ammonia is too large, ammonium salt crystals are formed on the surface and nearby of the catalyst, so that the activity of the catalyst is reduced, the contact area between the catalyst and the flue gas is reduced, and the denitration efficiency is greatly reduced. This is the main reason why some units have very good denitration efficiency at the beginning and very fast efficiency drop.
4. The crystallization of ammonium salt caused by the excessive ammonia spraying amount not only reduces the activity of the catalyst during the reaction, but also causes the blockage and corrosion of the air preheater. Equipment such as cloth bag dust removal, electrostatic dust removal and instruments and meters behind the air conditioner form ammonium salt crystals, and the equipment is damaged.
5. The coal-fired boiler using electrostatic dust collection adopts a high-frequency power supply for dust collection. Because ammonia escapes greatly, ammonia in the flue gas is oxidized under high-voltage arc, and NO can be formed in an electric room X . This is the case for many enterprises that use electrostatic precipitation to detect NO at the SCR reactor outlet X The amount is already low and the emission standard is fully reached. However, it reaches the desulfurization inlet NO X And the amount of the catalyst is high, the emission exceeds standard finally, the environment is polluted, and the enterprises are penalized by environmental protection departments.
6. Because the ammonia escape measurement is inaccurate, the ammonia spraying amount is large, so that excessive material investment is caused, and the waste is serious. And is a great economic loss for enterprises.
Disclosure of Invention
The invention aims to solve the technical problems that the sample gas extracted by the existing flue gas extraction device cannot well represent the overall level of flue gas in a flue and is easy to block, and provides a flue gas extraction system and a flue gas extraction method applied to ammonia escape detection.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the utility model provides a be applied to flue gas extraction system that ammonia escape detected, includes flue gas sampling device and extraction power device, still includes anti-blocking device, flue gas sampling device includes a plurality of extraction heads that equal area matrix distributes in the flue cross-section, and a plurality of extraction heads pass through the female jar of sample pipeline intercommunication gas mixture, the female jar of gas mixture with prevent that anti-blocking device communicates the sample pipeline side by side, and all be equipped with the valve, extraction power device and the female jar of gas mixture are connected.
The anti-blocking device comprises a back-blowing device and a first jet pump, the back-blowing device comprises a back-blowing pipeline and a hot compressed air tank, the hot compressed air tank is communicated with a sampling pipeline through the back-blowing pipeline, a first electromagnetic valve is arranged on the back-blowing pipeline, a second electromagnetic valve is arranged on a communicating pipeline of the sampling pipeline and a gas mixture mother tank, an outlet of the first jet pump is communicated with a flue, a suction inlet of the first jet pump is communicated with the sampling pipeline, a third electromagnetic valve is arranged on a pipeline for communicating the first jet pump with the sampling pipeline, a high-pressure port is connected with the hot compressed air tank through the pipeline, and a fourth electromagnetic valve is arranged on the pipeline.
The number of the extraction heads is at least 16, the pore sizes of the extraction heads are different, the pore sizes of the extraction heads are functionally related to the flue gas flow velocity at the position, and the pore sizes of the extraction heads corresponding to the large flue gas flow velocity at the position of the extraction heads are large.
The flue section comprises a flue cross section and a flue inclined section forming an included angle with the flue cross section, and the included angle is not equal to 90 degrees.
The air compressor is characterized by further comprising a PLC control cabinet, an electromagnetic valve control box, a compressed air heater, a compressed air tank and an air compressor, wherein the hot compressed air tank, the compressed air heater, the compressed air tank and the air compressor are sequentially communicated, a pressure sensor on the electromagnetic valve control box, a pressure sensor on the compressed air tank, a temperature sensor on the hot compressed air tank and the air compressor are all electrically connected with the PLC control cabinet, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are all electrically connected with the electromagnetic valve control box;
and the communication pipeline of the sampling pipeline and the gas mixture mother tank is also provided with a flow sensor, the second electromagnetic valve and the flow sensor are sequentially arranged along the flow direction of the flue gas, and the flow sensor is electrically connected with the PLC control cabinet.
The extraction power device is a second jet pump, an outlet of the second jet pump is communicated with the flue, a communication point is arranged below the extraction head, a suction inlet of the second jet pump is communicated with the lower end of the mixed gas mother tank, a high-pressure port of the second jet pump is connected with the hot compressed air tank, and a pneumatic regulating valve is arranged between the high-pressure port of the second jet pump and the hot compressed air tank.
The included angle between the sampling pipeline and the cross section of the flue is 15-60 degrees.
The number of the sampling pipelines is the same as the number of columns of the matrix, a plurality of extraction heads positioned in the same column are arranged in parallel, the multi-channel sampling pipelines are communicated with the mixed gas mother tank, and each sampling pipeline is provided with a valve.
The invention also provides a smoke extraction method, which uses the smoke extraction system applied to ammonia escape detection, extracts smoke through a plurality of extraction heads which are distributed in a matrix in a flue, and the extracted smoke enters a mixed gas mother tank through a sampling pipeline to be uniformly mixed, so as to be used for detecting the ammonia escape amount of the smoke by an ammonia escape detection device.
When a certain sampling pipeline is blocked, the corresponding second electromagnetic valve and third electromagnetic valve are closed, the corresponding first electromagnetic valve on the back flushing pipeline is opened, the back flushing is carried out on the sampling pipeline by hot compressed air in the hot compressed air tank, after the back flushing is finished, the first electromagnetic valve is closed, the third electromagnetic valve is opened, the first jet pump sucks the mixed gas of the compressed air and the smoke in the sampling pipeline and then discharges the mixed gas into a flue, then the third electromagnetic valve is closed, and the second electromagnetic valve is opened for smoke extraction.
The beneficial effects of the invention are as follows:
1. the method accurately detects the amounts of ammonia and NOx at the outlet of the SCR reactor, realizes ammonia spraying according to the mole ratio of ammonia to NOx, avoids excessive ammonia spraying, thereby reducing ammonium salt crystallization and solving the problem of air preheater blockage. The cleaning and maintenance cost of a large pen is saved.
2. The formation of ammonium salt crystals on and near the surface of the catalyst is avoided, and the service life of the catalyst is prolonged.
3. Providing extraction power by adopting a second jet pump, and sending the flue gas extracted from the flue back to the flue after ammonia escape detection without blades and other contact movable components in contact with the sample gas; and sweep the sampling pipeline through the hot compressed air tank, prevent to block up, hot compressed air can avoid the ammonia bisulfate that generates to form crystallization in the second jet pump moreover to combine particulate matter in the flue gas to form more firm plug, reduce extraction efficiency and even stop up completely.
Further details will be described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow velocity profile of a fluid in a rectangular flue;
FIG. 2 is a schematic diagram of the structure of the extraction head and the sampling pipe;
FIG. 3 is a first embodiment of a matrix distribution of multiple extraction heads within a flue;
FIG. 4 is a left side view of a second embodiment of a matrix distribution of multiple extraction heads within a flue;
fig. 5 is a schematic view of the overall structure of the present invention.
In the figure: 1. a fixing device; 2. a drawing head; 3. a sampling pipeline; 4. a first electromagnetic valve; 5. a second electromagnetic valve; 6. a third electromagnetic valve; 7. a first jet pump; 8. a fourth electromagnetic valve; 9. a mixed gas mother tank; 10. a second jet pump; 11. a pneumatic control valve; 12. a temperature sensor; 13. a pressure sensor; 14. an air sensor; 15. a flow sensor; 16. a PLC control cabinet; 17. a solenoid valve control box; 18. a hot compressed air tank; 19. a compressed air heater; 20. a compressed air tank; 21. a flue; 22. a first extraction head; 23. a second extraction head; 24. and a sample gas pipeline.
Detailed Description
Example 1:
the embodiment provides a be applied to flue gas extraction system that ammonia escape detected, including flue gas sampling device and extraction power device, still include anti-blocking device, flue gas sampling device includes a plurality of extraction heads 2 that equal area matrix distributes in flue 21 cross-section, and a plurality of extraction heads 2 pass through the female jar 9 of sample pipeline 3 intercommunication gas mixture, the female jar 9 of gas mixture and anti-blocking device parallel communication sample pipeline 3, and all are equipped with the valve, extraction power device and the female jar 9 of gas mixture are connected. The gas mixture mother tank 9 is connected to an ammonia slip detection device (for detecting the slip ammonia amount).
The principle of the invention is as follows:
because the rectangular pipe of the flue 21 has almost no straight pipe section, the flue 21 has turbulence factors such as support, and the like, which causes the confusion of the flue gas flow field. Moreover, for very uniform flow in the pipe of the flow field, the flow velocity of the fluid is also different at different positions in the pipe, and the flow velocity is generally high at the center position and low near the pipe wall (see fig. 1). Because the composition of the flue gas in the flue 21 is non-uniform and the flow rates at various locations are non-uniform, the sample gas to be detected must be a different amount of sample gas (the amount of sample gas is related to the flue gas flow rate at that sampling point) that is extracted at multiple locations.
The flue gas extraction system not only can effectively and accurately extract representative sample gas, but also has very important operation reliability and service life of one-time operation. For this purpose, the system adopts an anti-blocking device for preventing the whole system from being blocked and damaged.
Example 2:
on the basis of embodiment 1, this embodiment provides a flue gas extraction system for ammonia escape detection, extraction head 2 is 16 at least, and the aperture size of a plurality of extraction heads 2 is unequal, the aperture of extraction head 2 is with the flue gas velocity function correlation in place, the corresponding extraction head 2 aperture that the flue gas velocity of extraction head 2 place is big.
To ensure that the extracted sample gas component can represent the average component of the flue gas in the flue 21 to the maximum extent, a plurality of extraction heads 2 are firstly arranged in the flue 21 (for example, 4 m by 6 m flue 21 of a 350MW level unit, 16 extraction heads 2 are arranged, 7 m by 9 m flue 21 of a 600MW level unit, 24 extraction heads 2 are arranged); second, the amount of sample gas extracted by each extraction head 2 must be proportional to the flow rate of the flue gas in the pipe where the extraction heads 2 are located, and the plurality of extraction heads 2 are distributed over the flue cross section.
Flue gas flow rate in a certain period of time:wherein: />For the volume flow of the flue gas in the flue 21, m 3 /s；/>Is the section area of the flue 21, m 2 ；/>Is the average flow rate of the flue gas, m/s;
wherein:the volume flow of the flue gas in the grid where the sampling points 1-16 are positioned in the flue 21, m 3 /s；
The volume flow in each sampling point and the flow rate of the flue gas flowing through the sampling point have the following relation:
wherein:the average flow rate of the flue gas in the grid where the sampling points 1-16 are positioned in the flue 21 is m/s.
The negative pressure is arranged in the sampling pipeline 3, and the pressure in the flue 21 outside the sampling pipeline is higher than that in the sampling pipeline 3. Therefore, the amount of the sample gas extracted by the extraction head 2 is related to the diameter of the opening in the center of the extraction head 2. The extraction head 2 structure (differential pressure flowmeter). By theoretical calculation, the ratio of the flow rate in the area where each extraction head 2 is located to the average flow rate in the pipe is determined. And also the amount Q of sample gas that each extraction head 2 should extract. The head 2 is considered as a differential pressure flowmeter, and its differential pressure is the difference Δp between the inside and outside of the pipeline. See the following formula:
wherein Q is the amount of gas extracted; d is the size of the opening of the extracting head 2; alpha is the flow coefficient of the differential pressure type flowmeter with the structure of the extraction head 2; epsilon is the expansion coefficient of the flue gas; deltaPIs the pressure difference between the inside and the outside of the extraction head 2;ρis the working condition density of the flue gas.
For a group of extraction type sampling devices, the same type of extraction head 2 has the same flow coefficient, the same working condition density and expansion coefficient of the flue gas, the pressure difference delta P between the inside and the outside of the sampling pipeline 3, and the amount of the extracted sample gas is only related to the size of an opening. Thus, the above formula can be simplified as:k is a constant coefficient.
As shown in fig. 2, since the power source extracted when actually designing the extraction head 2 is closer to the first extraction head 22, the internal and external pressure difference Δ of the extraction head 2 is actually differentPNot constant, it is also necessary to add a pressure loss in the conduit between the first extraction head 22 and the second extraction head 23. The calculation is determined by the following formula:
since the friction coefficient lambda, the pipe inside diameter D, is already constant for the already selected sampling pipe 3, the distance L between each extraction head 2 is also fixed, so is the pressure loss between each extraction head 2Is constant, then the relationship between its differential pressure values: />
Therefore, the uniform proportion extraction of the sample gas can be controlled by pre-calculating the flow distribution condition in the pipeline and designing the aperture of the extraction head 2 through a functional relation.
Example 3:
on the basis of embodiment 1, this embodiment provides a flue gas extraction system for ammonia escape detection, prevent stifled device includes back flushing device and first jet pump 7, back flushing device includes back flushing pipeline and hot compressed air jar 18, hot compressed air jar 18 passes through back flushing pipeline and sampling pipeline 3 intercommunication, be equipped with first solenoid valve 4 on the back flushing pipeline, be equipped with second solenoid valve 5 on the communicating pipe line of sampling pipeline 3 and gas mixture mother tank 9, the export of first jet pump 7 communicates with each other with flue 21, and the sunction inlet and the sampling pipeline 3 of first jet pump 7 communicate, are equipped with third solenoid valve 6 on the pipeline of intercommunication both, and the high-pressure mouth passes through the pipeline and connects hot compressed air jar 18, and is equipped with fourth solenoid valve 8 on this pipeline.
For the accumulated ash of the part of the pipeline (the pipeline communicating the sampling pipeline 3 and the hot compressed air tank 18) outside the flue 21, the part of accumulated ash is because the flow direction of the flue gas is mostly vertical downwards, so that part of the flue gas in the flue gas can fall to the jet pump position of the pipeline under the action of gravity and the driving of the flue gas flow, and the high-speed hot compressed air sprayed by the jet pump and the flue gas are flushed into the flue 21 together, so that the blockage is not caused.
For the smoke dust which cannot automatically slide off, the hot compressed air tank 18 can be used for back-blowing the sampling pipeline 3 into the flue 21, so that the anti-blocking of the sampling pipeline 3 is completed. The timing purging is realized by adopting a purging mode one by one. Taking 4 paths of sampling pipelines 3 as an example, when one path is purged, the other 3 paths continue to work normally, one path of purging is needed, the second electromagnetic valve 5 is closed first, and the connection between the extraction head 2 and the gas mixture mother tank 9 is cut off. And opening the first electromagnetic valve 4, carrying out reverse hot compressed gas purging on the sampling pipeline 3 and the extraction head 2 through hot compressed air, closing the first electromagnetic valve 4 after purging for 1-5 minutes, and cutting off a purging air source to finish primary purging.
However, after purging, the section of the pipeline from the extraction head 2 to the sampling pipeline 3 is filled with hot air, if the second electromagnetic valve 5 is directly opened for extraction, the hot air in the pipeline is mixed into the sample gas, and the concentration of the sample gas is diluted. Therefore, after purging is completed, sampling cannot be started immediately, but the pipe needs to be emptied first. The in-pipe evacuation is that under the condition that the first electromagnetic valve 4 and the second electromagnetic valve 5 are closed, the third electromagnetic valve 6 and the fourth electromagnetic valve 8 are opened, hot compressed air enters the jet pump through the fourth electromagnetic valve 8, hot air in the extraction head 2 and the sampling pipeline 3 is discharged back into the flue 21 together with flue gas through the suction effect of the jet pump, and the time for evacuating the gas in the extraction head 2 and the sampling pipeline 3 is less than 2 s.
Example 4:
on the basis of embodiment 2, this embodiment provides a flue gas extraction system applied to ammonia escape detection, and the section of the flue 21 comprises a flue cross section and a flue inclined section forming an included angle with the flue cross section, and the included angle is not equal to 90 °.
Taking a 4 m×6 m flue 21 of a 350MW level unit as an example, 16 extraction heads 2 (a total of four sampling pipelines 3, and four extraction heads 2 on each column are connected in parallel on one sampling pipeline 3) are arranged, the flue 21 is divided into a plurality of areas, and the extraction heads 2 are distributed in a matrix in the flue 21.
Specifically, the following two embodiments are distributed, and in the first embodiment, as shown in fig. 3, four sampling pipelines 3 are in the same plane and are inclined downwards by the same angle, and the four sampling pipelines 3 are connected in parallel to enter the gas mixture mother tank 9 through a gas sample pipeline 24. In the second embodiment, as shown in fig. 4, the four-way sampling pipe 3 is installed at a uniform inclination angle, but the installed heights are different, and the farther from the gas mixture mother tank 9, the higher the one way height is. The purpose of this arrangement is to facilitate the sliding of the fumes in the sampling line 3 in downstream direction (in the case of particularly high fumes content in the fumes) along the flow direction of the extracted fumes, with a lower and lower height.
In this embodiment, the number of the sampling pipelines 3 is the same as the number of columns of the matrix, a plurality of extraction heads 2 located in the same column are arranged in parallel, the multiple sampling pipelines 3 are all communicated with the gas mixture mother tank 9, and each sampling pipeline 3 is provided with a valve (a second electromagnetic valve 5).
The extraction power device is a second jet pump 10, the outlet of the second jet pump 10 is communicated with a flue 21, the communication point is arranged below the extraction head 2, the suction inlet of the second jet pump 10 is communicated with the lower end of the mixed gas mother tank 9, the high-pressure port of the second jet pump 10 is connected with a hot compressed air tank 18, and a pneumatic regulating valve 11 is arranged between the two. Under the suction action of the second jet pump 10, the sample gas in the hot compressed air and the sample gas in the mixed gas mother tank 9 are mixed in the throat of the second jet pump 10 and discharged into the flue 21 together through the jet head, so that the real-time fluidity of the sample gas is ensured, the accumulation and blockage of smoke dust in the extraction system are prevented, and the primary extraction is completed. Because the extraction process is continuous and the extraction speed is relatively high (3 m/s-20 m/s), ash is not easy to accumulate in the extraction system, the gas exchange is very fast, and the flue gas can complete one cycle in the sampling device for 1 s-6 s.
The sampling pipeline 3 and the cross section of the flue 21 form an included angle of 15-60 degrees. Because the sampling pipeline 3 is relatively long and is easy to accumulate ash, the smoke dust accumulated in the sampling pipeline 3 slides downwards under the action of gravity by adopting the installation mode, and finally slides into the flue 21 in the extraction head 2.
Example 5:
on the basis of embodiment 2, the embodiment provides a flue gas extraction system applied to ammonia escape detection, further comprising a PLC control cabinet 16, an electromagnetic valve control box 17, a compressed air heater 19, a compressed air tank and an air compressor, wherein the hot compressed air tank 18, the compressed air heater 19, the compressed air tank 20 and the air compressor are sequentially communicated, the electromagnetic valve control box 17, a pressure sensor 13 on the compressed air tank, a temperature sensor 12 on the hot compressed air tank 18 and the air compressor are electrically connected with the PLC control cabinet 16, and the first electromagnetic valve 4, the second electromagnetic valve 5, the third electromagnetic valve 6 and the fourth electromagnetic valve 8 are electrically connected with the electromagnetic valve control box 17;
the communication pipe line of the sampling pipeline 3 and the gas mixture mother tank 9 is also provided with a flow sensor 15, the second electromagnetic valve 5 and the flow sensor 15 are sequentially arranged along the flow direction of the flue gas, and the flow sensor 15 is electrically connected with a PLC control cabinet 16. The air compressor is provided with an air sensor 14, and the air sensor 14 is electrically connected with a PLC control cabinet 16.
As shown in fig. 5, the PLC control cabinet 16 regulates the power of the air compressor according to the signal of the pressure sensor 13 to prepare constant pressure compressed air, senses the temperature of the hot compressed air through the temperature sensor 12, and regulates the heating power of the compressed air heater 19 according to the temperature parameter to obtain a stable constant temperature and constant pressure air source.
The flow sensor 15 is used for monitoring the flow of the sampled air in the sampling pipeline 3, and is mainly used for monitoring whether the flow in the sampling pipeline 3 is smooth. If the flow is very small or even no flow is detected in the normal sampling process, the PLC system will first check the switch position of the second solenoid valve 5 and whether the second solenoid valve is in place, and if the monitoring fault is detected, the valve fault will be reported. If the valve is correctly positioned, the pneumatic emergency purging is performed, and the emergency reverse purging is performed on the sampling pipeline 3. If the fault is not eliminated after the purging, a secondary emergency purging is performed, and if the fault is not eliminated. The PLC system can give an alarm, and whether a pipeline is blocked or a flowmeter is in fault needs to be checked manually.
Wherein, the sampling pipeline 3 is fixedly arranged in the flue 21 through the fixing device 1. And high manganese steel sleeves are arranged outside the extraction heads 2, so that the wear resistance is improved. And heat insulation layers are arranged on the pipelines outside the flue 21. The temperature of the extracted sample gas in the whole device is not lower than the temperature in the flue 21. The flue gas can not be blocked by factors such as crystallization, scaling and the like caused by the fact that the temperature of the flue gas is reduced in the sampling device.
Example 6:
the embodiment provides a flue gas extraction method, and the flue gas extraction system applied to ammonia escape detection provided in embodiment 2 is used for extracting flue gas through a plurality of extraction heads 2 distributed in a matrix in a flue 21, and the extracted flue gas enters a mixed gas mother tank 9 through a sampling pipeline 3 to be uniformly mixed, so that the ammonia escape detection device is used for detecting the ammonia escape amount of the flue gas.
When a certain sampling pipeline 3 is blocked, the corresponding second electromagnetic valve 5 and third electromagnetic valve 6 are closed, the corresponding first electromagnetic valve 4 on the reverse purging pipeline is opened, the sampling pipeline 3 is reversely purged by hot compressed air in the hot compressed air tank 18, after the reverse purging is finished, the first electromagnetic valve 4 is closed, the third electromagnetic valve 6 is opened, the first jet pump 7 sucks the mixture of the compressed air and the smoke in the sampling pipeline 3 and then discharges the mixture into the flue 21, then the third electromagnetic valve 6 is closed, and the second electromagnetic valve 5 is opened for smoke extraction.
The portions of the present embodiment not specifically described are common general knowledge and known techniques in the art, and will not be described in detail here.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (9)
1. Be applied to flue gas extraction system that ammonia escape detected, including flue gas sampling device and extraction power device, its characterized in that: the flue gas sampling device comprises a plurality of extraction heads (2) which are distributed in a matrix in the same area in the section of the flue (21), the plurality of extraction heads (2) are communicated with a mixed gas main tank (9) through a sampling pipeline (3), the mixed gas main tank (9) and the anti-blocking device are communicated with the sampling pipeline (3) in parallel, valves are arranged, and the extraction power device is connected with the mixed gas main tank (9);
the anti-blocking device comprises a back-blowing device and a first jet pump (7), wherein the number of the extraction heads (2) is at least 16, the pore sizes of the plurality of the extraction heads (2) are different, the pore sizes of the extraction heads (2) are related to the function of the flue gas flow velocity at the position, the pore sizes of the corresponding extraction heads (2) with large flue gas flow velocity at the position of the extraction heads (2) are large, and the equal-proportion extraction of flue gas can be controlled through the extraction heads (2) with different pore sizes.
2. A smoke extraction system for use in ammonia slip detection according to claim 1, wherein: the back flushing device comprises a back flushing pipeline and a hot compressed air tank (18), the hot compressed air tank (18) is communicated with a sampling pipeline (3) through the back flushing pipeline, a first electromagnetic valve (4) is arranged on the back flushing pipeline, a second electromagnetic valve (5) is arranged on a communicating pipeline of the sampling pipeline (3) and a gas mixture mother tank (9), an outlet of a first jet pump (7) is communicated with a flue (21), a suction inlet of the first jet pump (7) is communicated with the sampling pipeline (3), a third electromagnetic valve (6) is arranged on the pipeline communicating the first jet pump and the sampling pipeline, a high-pressure port is connected with the hot compressed air tank (18) through the pipeline, and a fourth electromagnetic valve (8) is arranged on the pipeline.
3. A smoke extraction system for use in ammonia slip detection according to claim 1, wherein: the section of the flue (21) comprises a flue cross section and a flue inclined section forming an included angle with the flue cross section, and the included angle is not equal to 90 degrees.
4. A smoke extraction system for use in ammonia slip detection according to claim 2, wherein: the automatic control device is characterized by further comprising a PLC control cabinet (16), an electromagnetic valve control box (17), a compressed air heater (19), a compressed air tank and an air compressor, wherein the hot compressed air tank (18), the compressed air heater (19), the compressed air tank (20) and the air compressor are sequentially communicated, the electromagnetic valve control box (17), a pressure sensor (13) on the compressed air tank, a temperature sensor (12) on the hot compressed air tank (18) and the air compressor are electrically connected with the PLC control cabinet (16), and the first electromagnetic valve (4), the second electromagnetic valve (5), the third electromagnetic valve (6) and the fourth electromagnetic valve (8) are electrically connected with the electromagnetic valve control box (17);
the gas-liquid mixing device is characterized in that a flow sensor (15) is further arranged on a communicating pipe of the sampling pipeline (3) and the gas-liquid mixing mother tank (9), the second electromagnetic valve (5) and the flow sensor (15) are sequentially arranged along the flow direction of the flue gas, and the flow sensor (15) is electrically connected with a PLC control cabinet (16).
5. A smoke extraction system for use in ammonia slip detection according to any one of claims 1-4, wherein: the extraction power device is a second jet pump (10), an outlet of the second jet pump (10) is communicated with a flue (21), a communication point is arranged below the extraction head (2), a suction inlet of the second jet pump (10) is communicated with the lower end of the mixed gas mother tank (9), a high-pressure port of the second jet pump (10) is connected with a hot compressed air tank (18), and a pneumatic regulating valve (11) is arranged between the hot compressed air tank and the hot compressed air tank.
6. A smoke extraction system for use in ammonia slip detection according to any one of claims 1-4, wherein: the sampling pipeline (3) and the cross section of the flue (21) form an included angle of 15-60 degrees.
7. A smoke extraction system for use in ammonia slip detection according to any one of claims 1-4, wherein: the number of the sampling pipelines (3) is the same as the number of columns of the matrix, a plurality of extraction heads (2) positioned in the same column are arranged in parallel, the multi-channel sampling pipelines (3) are communicated with a gas mixture mother tank (9), and each channel of sampling pipeline (3) is provided with a valve.
8. A method of fume extraction using a fume extraction system according to claim 2 for ammonia slip detection, characterized in that: the flue gas is extracted through a plurality of extraction heads (2) which are distributed in a matrix in the flue (21), and the extracted flue gas enters a mixed gas mother tank (9) through a sampling pipeline (3) to be uniformly mixed, so that the ammonia escape detection device is used for detecting the ammonia escape amount of the flue gas.
9. A flue gas extraction method according to claim 8, wherein: when a certain sampling pipeline (3) is blocked, a corresponding second electromagnetic valve (5) and a corresponding third electromagnetic valve (6) are closed, a first electromagnetic valve (4) on a corresponding reverse purging pipeline is opened, the sampling pipeline (3) is reversely purged by hot compressed air in a hot compressed air tank (18), after the reverse purging is finished, the first electromagnetic valve (4) is closed, the third electromagnetic valve (6) is opened, a first jet pump (7) sucks the mixture of the compressed air of the sampling pipeline (3) and the smoke into a flue (21), then the third electromagnetic valve (6) is closed, and the second electromagnetic valve (5) is opened for smoke extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229803.2A CN108333004B (en) | 2018-03-20 | 2018-03-20 | Flue gas extraction system and flue gas extraction method applied to ammonia escape detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229803.2A CN108333004B (en) | 2018-03-20 | 2018-03-20 | Flue gas extraction system and flue gas extraction method applied to ammonia escape detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108333004A CN108333004A (en) | 2018-07-27 |
| CN108333004B true CN108333004B (en) | 2023-11-28 |
Family
ID=62931104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810229803.2A Active CN108333004B (en) | 2018-03-20 | 2018-03-20 | Flue gas extraction system and flue gas extraction method applied to ammonia escape detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108333004B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307612B (en) * | 2018-10-19 | 2021-12-07 | 清华大学合肥公共安全研究院 | Device and method for preventing gas sampling passage from being blocked |
| CN109224854B (en) * | 2018-11-09 | 2021-12-21 | 上海明华电力科技有限公司 | Flue gas denitration grid method rotation sampling ammonia and nitrogen oxide combined monitoring device |
| CN111044685B (en) * | 2019-12-31 | 2024-05-31 | 佛山华谱测智能科技有限公司 | SCR outlet gas component online grid type itinerant detection system |
| CN111766349A (en) * | 2020-08-04 | 2020-10-13 | 浙江浙能技术研究院有限公司 | Partitioned sampling ammonia escape measurement system and method |
| CN113504343A (en) * | 2021-08-05 | 2021-10-15 | 国能南京电力试验研究有限公司 | Thermal power plant flue gas ammonia escape amount measuring device and measuring method |
| CN115615954A (en) * | 2022-12-20 | 2023-01-17 | 合肥金星智控科技股份有限公司 | TDLAS-based ammonia gas online monitoring assembly, monitoring system and monitoring method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354330A (en) * | 2011-07-26 | 2012-02-15 | 中环（中国）工程有限公司 | Method for optimizing parameters of ammonia-spraying device for matching sprayed ammonia with smoke airflow field in smoke denitration system |
| CN102564810A (en) * | 2011-12-28 | 2012-07-11 | 南京埃森环境技术有限公司 | Denitrated flue gas sampling and pretreatment device |
| CN105983302A (en) * | 2016-05-31 | 2016-10-05 | 邢红涛 | Component detection and ammonia spraying control system of SCR denitrification process |
| CN205861653U (en) * | 2016-07-19 | 2017-01-04 | 南京博沃科技发展有限公司 | A kind of distributed tour gauging system of SCR exit NOx concentration |
| CN206470247U (en) * | 2017-01-19 | 2017-09-05 | 国电科学技术研究院 | A kind of SCR exhaust pass cross section nitrogen oxides and oxygen concentration on-line monitoring system |
| CN208091786U (en) * | 2018-03-20 | 2018-11-13 | 陕西凯特自动化工程有限公司 | A kind of fume extraction system applied to the escaping of ammonia detection |
-
2018
- 2018-03-20 CN CN201810229803.2A patent/CN108333004B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354330A (en) * | 2011-07-26 | 2012-02-15 | 中环（中国）工程有限公司 | Method for optimizing parameters of ammonia-spraying device for matching sprayed ammonia with smoke airflow field in smoke denitration system |
| CN102564810A (en) * | 2011-12-28 | 2012-07-11 | 南京埃森环境技术有限公司 | Denitrated flue gas sampling and pretreatment device |
| CN105983302A (en) * | 2016-05-31 | 2016-10-05 | 邢红涛 | Component detection and ammonia spraying control system of SCR denitrification process |
| CN205861653U (en) * | 2016-07-19 | 2017-01-04 | 南京博沃科技发展有限公司 | A kind of distributed tour gauging system of SCR exit NOx concentration |
| CN206470247U (en) * | 2017-01-19 | 2017-09-05 | 国电科学技术研究院 | A kind of SCR exhaust pass cross section nitrogen oxides and oxygen concentration on-line monitoring system |
| CN208091786U (en) * | 2018-03-20 | 2018-11-13 | 陕西凯特自动化工程有限公司 | A kind of fume extraction system applied to the escaping of ammonia detection |
Non-Patent Citations (1)
| Title |
|---|
| 基于TDLAS技术的氨逃逸检测设备研究;郝志国;宋艳珂;;电力安全技术(第09期);第31-35页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108333004A (en) | 2018-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108333004B (en) | Flue gas extraction system and flue gas extraction method applied to ammonia escape detection | |
| CN206325405U (en) | A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system | |
| CN211659724U (en) | Denitration ammonia injection optimization system | |
| WO2021174785A1 (en) | Method for monitoring effect of ammonia escape from denitration on downstream rotary air preheater | |
| CN103488824A (en) | Field operation optimization method for SCR (selective catalytic reduction) denitration system | |
| CN206935094U (en) | A kind of SNCR equipment for denitrifying flue gas | |
| CN208599485U (en) | A kind of high-temperature dust removal SCR denitration integral process device | |
| CN208091786U (en) | A kind of fume extraction system applied to the escaping of ammonia detection | |
| CN202860407U (en) | Full mixing-type ammonia spraying component | |
| CN207964391U (en) | A kind of flue gas sampling device | |
| CN106552509A (en) | A kind of boiler run control method for preventing SCR denitration area from blocking | |
| CN201216921Y (en) | Novel controllable wet desulphurization column for smoke prevention and dust control | |
| CN109395563B (en) | Efficient liquid atomization spraying device and method | |
| CN201711088U (en) | Mixed mode wet-process fire coal flue gas desulphurization dust removal tower | |
| CN212340774U (en) | Sample gas collection system for denitration CEMS (continuous emission monitoring System) of coal-fired unit | |
| CN105444833A (en) | Pressure equalizing chamber, mounting method thereof and three-dimension space multi-point pressure measuring and cross section type gas flow measuring device containing pressure equalizing chamber | |
| CN113091050A (en) | Optimization system combining tail denitration and in-furnace combustion and control method thereof | |
| CN211205941U (en) | Differential pressure type flue gas gridding multi-point sampling device | |
| CN109224854B (en) | Flue gas denitration grid method rotation sampling ammonia and nitrogen oxide combined monitoring device | |
| CN107166376A (en) | Fluidized-bed combustion boiler denitrification apparatus and method of denitration based on cyclone separator | |
| CN218782247U (en) | Flue gas measurement system based on full section multiple spot sampling model | |
| CN207964392U (en) | A kind of fume extraction anti-blocking system | |
| CN211927423U (en) | A flue gas sampling device that is used for SCR denitration to draw from penetrating multiple spot sampling system | |
| CN113503558A (en) | CEMS (continuous emission monitoring system) multipoint sampling system for denitration inlet flue and denitration outlet flue of coal-fired unit | |
| CN205627607U (en) | Modified SNCR denitrification facility of medium temperature high efficiency of gratefiring boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |