CN219870886U - Denitration flue gas multicomponent on-line monitoring device - Google Patents
Denitration flue gas multicomponent on-line monitoring device Download PDFInfo
- Publication number
- CN219870886U CN219870886U CN202320987547.XU CN202320987547U CN219870886U CN 219870886 U CN219870886 U CN 219870886U CN 202320987547 U CN202320987547 U CN 202320987547U CN 219870886 U CN219870886 U CN 219870886U
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- Prior art keywords
- air chamber
- monitoring device
- flue gas
- air
- power distribution
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000003546 flue gas Substances 0.000 title claims abstract description 20
- 238000012806 monitoring device Methods 0.000 title claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 55
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 11
- 150000003863 ammonium salts Chemical class 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000004868 gas analysis Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 29
- 238000005259 measurement Methods 0.000 description 6
- 238000004321 preservation Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 206010053615 Thermal burn Diseases 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000960 laser cooling Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model relates to the technical field of gas analysis, in particular to a denitration flue gas multicomponent on-line monitoring device. The device comprises an air chamber, a power distribution control cabinet and a bracket; the air chamber is arranged at the upper part of the bracket, the power distribution control cabinet is arranged at the lower part of the bracket, and the air chamber is electrically connected with the power distribution control cabinet; the air chamber comprises an air chamber shell, and a laser analyzer is arranged in the air chamber shell; the gas inlet end of the laser analyzer is a sample gas inlet, the gas outlet end of the laser analyzer is a sample gas outlet, and a filter is arranged at the sample gas inlet; the air chamber also comprises a jet pump and an angle seat valve which are fixedly connected with each other; the compressed air pipeline connected to the jet pump is a U-shaped coil pipe. Through set up the filter at the sample gas entry, effectively avoided impurity pollution air chamber's phenomenon, adopt U type coil pipe design with compressed air pipeline simultaneously to minimum space extension pipeline length makes compressed air can fully preheat in the air chamber, has avoided the phenomenon that produces ammonium salt crystallization at jet pump department difference in temperature greatly.
Description
Technical Field
The utility model relates to the technical field of gas analysis, in particular to a denitration flue gas multicomponent on-line monitoring device.
Background
The multi-component online denitration flue gas monitoring device is used for continuously monitoring the gas to be detected in the flue gas online, and is mainly applied to gas emission monitoring and process control in a plurality of industrial fields, for example: coal-fired power plants, aluminum plants, steel plants, smelting plants, garbage power plants, cement plants and chemical plants, glass plants, and the like.
In the existing denitration flue gas multicomponent online monitoring system, when monitoring is carried out, flue gas is easy to cause air chamber pollution, instrument damage is caused, measurement is not precise, and the air chamber has poor heat preservation effect and influences measurement accuracy; the air chamber is too high in temperature to easily cause equipment damage, and meanwhile, the compressed air pipeline is easy to be heated unevenly, so that ammonium salt crystals are generated at the jet pump, instrument parts are damaged, and the service life of the equipment is shortened.
Disclosure of Invention
To above-mentioned shortcoming, this device has improved, through set up the filter at the sample gas entry, has effectively avoided the phenomenon of impurity pollution air chamber, adopts U type coil pipe design with compressed air pipeline simultaneously to minimum space extension pipeline length for compressed air can fully preheat in the air chamber, has avoided the phenomenon that produces the ammonium salt crystallization at jet pump department difference in temperature greatly.
The technical scheme of the utility model is as follows:
a multi-component online monitoring device for denitration flue gas comprises an air chamber, a power distribution control cabinet and a bracket; the air chamber is arranged at the upper part of the bracket, the power distribution control cabinet is arranged at the lower part of the bracket, and the air chamber is electrically connected with the power distribution control cabinet;
the air chamber comprises an air chamber shell, and a laser analyzer is arranged in the air chamber shell;
the gas inlet end of the laser analyzer is a sample gas inlet, the gas outlet end of the laser analyzer is a sample gas outlet, and a filter is arranged at the sample gas inlet;
the air chamber also comprises a jet pump and an angle seat valve which are fixedly connected with each other; the three interfaces of the jet pump are respectively connected with the emptying pipeline, a sample gas outlet of the laser analyzer and the compressed air pipeline; the angle seat valve is used for controlling the on-off of three pipelines of the emptying pipeline, the sample gas outlet pipeline and the compressed air pipeline; the compressed air pipeline connected to the jet pump is a U-shaped coil pipe.
Further, a stainless steel protective shell is arranged at the transmitting end and the reflecting end of the laser analyzer; the inner surface of the air chamber shell is provided with a stainless steel mirror surface inner lining plate.
Further, the air chamber comprises a temperature control switch for controlling the heating temperature of the air chamber.
Further, an air source pressure regulating filter is arranged at the inlet of the compressed air pipeline and is used for regulating the air inlet pressure of the compressed air and filtering moisture and impurities in the compressed air.
Further, the power distribution cabinet comprises a gas circuit distributor, a sampling electromagnetic valve, a back-blowing electromagnetic valve, a high-temperature stop valve, a pressure regulating valve, a flowmeter, a pressure gauge and a cutting sleeve regulating valve.
Further, the power distribution control cabinet both sides set up heat dissipation grid and fan for to the inside heat dissipation of power distribution control cabinet, the fan outside sets up the risk protection casing.
Further, a filter cotton sheet is filled between the heat radiation grille and the fan, so that impurity particles are prevented from entering the control cabinet through the fan to influence the normal operation of the instrument in the cabinet.
Further, the four corners of rack support bottom base all fixedly connected with supporting seat, the bottom fixedly connected with rubber pad of supporting seat, the bottom of rack body both sides is all fixedly connected with stopper.
Further, a snap lock is provided on the air chamber housing.
Further, the pipelines are all 316L stainless steel air pipes.
The beneficial effects are that:
1. the filter is arranged at the inlet of the sample gas, so that the impurity particles with the size of mu m in the sample gas can be effectively filtered, the impurities are prevented from entering the laser analyzer, and the damage of the laser analyzer caused by the pollution of the impurities to the air chamber can be avoided. Meanwhile, the compressed air pipeline is designed by adopting a U-shaped coil pipe, so that the length of the pipeline is prolonged in a minimum space, the compressed air can be fully preheated in the air chamber, and the phenomenon that the compressed air temperature of the jet pump is low and the high-temperature sample gas phase of the air outlet pipeline of the laser analyzer is crystallized when the ammonium salt is generated, so that the pipeline is blocked and the jet pump is damaged is prevented.
2. The air chamber shell is arranged to cover the upper part of the laser analyzer and is used for performing heat preservation and protection on the laser air chamber, and pollution of the internal environment and damage of the laser analyzer caused by impurities entering a heating area of the air chamber can be prevented; the inside of the air chamber shell is designed with a 304 stainless steel mirror surface lining plate, which has excellent heat preservation function for heating the air chamber of the laser analyzer and prevents the loss of the heating temperature of the air chamber from affecting the measurement precision of the analyzer; the pipeline is all provided with the 316L stainless steel air pipe, so that the sample gas can be effectively prevented from being adsorbed on the inner wall of the pipeline, the integrity of the sample gas entering the laser analysis is further ensured, and the measurement accuracy is ensured. Adopt the hasp lock design to avoid the air chamber to open and shut the heat loss that causes and improve the heat preservation effect outside, the hasp lock factor of safety is high, and only the professional of the key of holding can open the air chamber shell and maintain laser analyzer, can prevent that non-professional from opening the air chamber shell and causing incident such as scald.
3. The air chamber is designed with a temperature control switch for controlling the heating temperature of the air chamber, once the temperature control switch is turned off due to overhigh heating temperature, a heating plate in the air chamber is powered off to stop heating, and a protection circuit works normally to prevent burning out of the circuit and the instrument due to overhigh heating temperature.
4. The laser analyzer transmitting end and the reflecting end are designed with stainless steel protective cases, so that damage to the transmitting end and the receiving end caused by external environment and interference of external light are prevented.
Description of the drawings:
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a top view of the present utility model;
FIG. 3 is a schematic view of the overall structure of another angle of the present utility model;
FIG. 4 is a schematic diagram of the structure of the air circuit distributor;
in the figure:
the device comprises a filter 1, a jet pump 2, a laser analyzer 3, an air chamber shell 4, a snap lock 5, a stainless steel mirror inner lining plate 6, a stainless steel protective shell 7, an air chamber 8, a temperature control switch 9, an angle seat valve 10, a bracket 11, an air source pressure regulating filter 12, a limiting block 13, a power distribution control cabinet 14, a fan protection cover 15, a supporting seat 16, a fan 17 and a compressed air pipeline 18;
a sample gas outlet 301 and a sample gas inlet 302;
the device comprises a gas circuit distributor 1401, a sampling electromagnetic valve 1402, a back-flushing electromagnetic valve 1404, a high-temperature stop valve 1403, a pressure regulating valve 1406, a flowmeter 1408, a pressure gauge 1407 and a clamping sleeve regulating valve 1405.
Detailed Description
The technical means, the inventive features, the achievement of the purpose and the effect achieved by the present utility model are easily understood, and the present utility model is further described below with reference to the accompanying drawings.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The description and examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model. The true scope and spirit of the utility model is indicated by the following claims.
As shown in fig. 1-4, the denitration flue gas multicomponent on-line monitoring device comprises an air chamber 8, a power distribution control cabinet 14 and a bracket 11; the air chamber is arranged at the upper part of the bracket 11, the power distribution control cabinet 14 is arranged at the lower part of the bracket 11, and the air chamber 8 is electrically connected with the power distribution control cabinet 14;
the air chamber 8 comprises an air chamber shell 4, and a laser analyzer 3 is arranged inside the air chamber shell 4;
the air inlet end of the laser analyzer 3 is a sample gas inlet 302, the air outlet end is a sample gas outlet 301, and a filter 1 is arranged at the sample gas inlet 302; filter 1 is a μm-sized filter;
the air chamber 8 also comprises a jet pump 2 and an angle seat valve 10 which are fixedly connected with each other; the three interfaces of the jet pump 2 are respectively connected with an emptying pipeline, a sample gas outlet 301 of the laser analyzer and a compressed air pipeline 18; the angle seat valve 10 is used for controlling the on-off of three pipelines of an emptying pipeline, a sample gas outlet pipeline and a compressed air pipeline; the compressed air line 18 to the jet pump is a U-shaped coil.
The transmitting end and the reflecting end of the laser analyzer 3 are provided with stainless steel protective shells 7; the inner surface of the air chamber shell 4 is provided with a stainless steel mirror surface inner lining plate 6 which is 304 stainless steel mirror surface inner lining plate.
The air chamber 8 includes a temperature control switch 9 for controlling the heating temperature of the air chamber 8. Once the temperature control switch with the too high heating temperature is turned off, the heating plate in the air chamber is powered off to stop heating, the protection circuit works normally, and the circuit and the instrument are prevented from being burnt out due to the too high heating temperature.
An inlet of the compressed air pipeline 18 is provided with an air source pressure regulating filter 12 for regulating the air inlet pressure of the compressed air and filtering moisture and impurities in the compressed air.
The power distribution cabinet comprises a gas circuit distributor 1401, a sampling electromagnetic valve 1402, a back-blowing electromagnetic valve 1404, a high-temperature stop valve 1403, a pressure regulating valve 1406, a flowmeter 1408, a pressure gauge 1407 and a clamping sleeve regulating valve 1405; the sampling electromagnetic valve is used for controlling the laser gas analyzer to pump sampling gas; the back-blowing electromagnetic valve is used for realizing the timing connection of impurities of the compressed air purging sampling tube and preventing the pipeline from being blocked; the high-temperature stop valve is used for controlling the on-off of the angle seat valve; the cutting sleeve regulating valve is used for regulating the flow of the laser cooling gas; the pressure regulating valve is provided with a digital display pressure gauge for displaying the pressure of the sampling pipeline in real time and sending out an alarm signal under the condition of insufficient pressure; the flowmeter is a float flowmeter and is used for controlling the flow of the input standard gas.
The power distribution control cabinet 14 both sides set up heat dissipation grid and fan 17 for to the inside heat dissipation of power distribution control cabinet, the fan outside sets up risk protection casing 15. And a filter cotton sheet is filled between the heat radiation grille and the fan 17, so that foreign particles are prevented from entering the control cabinet through the fan 17 to influence the normal operation of instrument devices in the cabinet, and the instrument is prevented from being damaged.
Four corners of rack support bottom base all fixedly connected with supporting seat 16, the bottom fixedly connected with rubber pad of supporting seat 16, the bottom of rack body both sides is the equal fixed connection stopper 13. The rack support bears the weight of air chamber and distribution control cabinet simultaneously, in order to prevent the unstable condition of bearing, the rack support adopts triangle-shaped bearing structure, prevents the hidden danger of rack anteverted, has improved the stability of whole framework greatly. The equal fixedly connected with supporting seat in four corners of rack support bottom base, the equal fixedly connected with stopper in bottom of supporting seat bottom fixedly connected with rubber pad, the equal fixedly connected with stopper in bottom of rack body both sides can carry out spacingly to the rack body through the use of stopper, avoids it to produce violently rocking at absorbing in-process.
The air chamber shell is provided with a snap lock 5. The hasp lock is furnished with the key, and the professional of the key of holding can open the air chamber shell and maintain laser analyzer, prevents that non-professional from opening the air chamber shell and causes incident such as scald, further guarantees the heat preservation safeguard function of air chamber QS.
The gas pipeline is all provided with 316L stainless steel gas pipes, so that the sample gas can be effectively prevented from being adsorbed on the inner wall of the pipeline, the integrity of the sample gas entering the laser analyzer is further ensured, and the measurement accuracy is ensured.
The whole working flow comprises the following steps: the sample gas is sampled by the sampling probe and then reaches the inlet of the filter through the heat tracing pipe, the filter filters the mu m-level gas impurities and then is connected to the inlet of the angle seat valve, the angle seat valve controls the on-off of the sample gas, and the outlet of the angle seat valve is connected to the sample gas inlet of the laser analyzer; after analysis and measurement, a sample gas outlet of a gas chamber of the laser analyzer is connected to an interface above jet flow, the left end of a jet pump is an exhaust gas path, the measured sample gas is exhausted, and the right end of the jet pump is a compressed air inlet pipeline. The compressed air pipeline connected to the jet pump adopts a U-shaped coil pipe design, so that the pipeline length is prolonged in a minimum space, compressed air can be fully preheated in the air chamber, and the phenomena of pipeline blockage and jet pump damage caused by the phenomenon that the temperature of the compressed air introduced into the right end of the jet pump is low and ammonium salt crystallization occurs in a high-temperature sample gas phase of an air outlet pipeline of a laser analyzer are prevented.
The compressed air provides negative pressure for the jet pump through the compressed air pipeline, so that the sample gas can enter the air chamber of the laser analyzer. Flow path of compressed air: the compressed air firstly passes through an air source pressure regulating filter, and is connected to an inlet 1 below an air path distributor of a power distribution control cabinet through an air source inlet after the pressure of the compressed air is regulated, a 3 outlet of a first route air path distributor is connected to a pressure regulating valve, an outlet of the pressure regulating valve is connected to a sampling electromagnetic valve inlet (the sampling electromagnetic valve controls the on-off of an air path), an outlet of the sampling electromagnetic valve is connected to the power distribution control cabinet, and the air is connected to a compressed air inlet at the right end of an upper jet pump; the outlet 4 of the second route gas circuit distributor is connected with the inlet of a back-blowing electromagnetic valve, and the outlet of the back-blowing electromagnetic valve is connected with a power distribution control cabinet to carry out back-blowing on the sampling probe; the outlet 5 of the third route gas path distributor is connected with the inlet below the cutting sleeve regulating valve, the outlet of the cutting sleeve regulating valve is connected with the power distribution control cabinet, and the power distribution control cabinet is connected with the laser analyzer to cool the laser analyzer; and the outlet 2 of the fourth route gas path distributor is connected to the inlet of the high-temperature stop valve, and two routes of compressed air coming out of the high-temperature stop valve are connected to the two inlets of the angle seat valve, so that the angle seat valve is ventilated to control the opening and closing of the angle seat valve. And the concentration value analyzed and measured by the laser analyzer is transmitted to a touch screen of the power distribution control cabinet through an RS-485 signal to display the gas concentration value.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.
Claims (10)
1. The multi-component online monitoring device for the denitration flue gas is characterized by comprising an air chamber (8), a power distribution control cabinet (14) and a bracket (11); the air chamber is arranged at the upper part of the bracket (11), the power distribution control cabinet (14) is arranged at the lower part of the bracket (11), and the air chamber (8) is electrically connected with the power distribution control cabinet (14);
the air chamber (8) comprises an air chamber shell (4), and a laser analyzer (3) is arranged inside the air chamber shell (4);
the air inlet end of the laser analyzer (3) is a sample air inlet (302), the air outlet end is a sample air outlet (301), and a filter (1) is arranged at the sample air inlet (302);
the air chamber (8) also comprises a jet pump (2) and a corner seat valve (10) which are fixedly connected with each other; the three interfaces of the jet pump (2) are respectively connected with an emptying pipeline, a sample gas outlet (301) of the laser analyzer and a compressed air pipeline (18); the angle seat valve (10) is used for controlling the on-off of the pipeline; the compressed air pipeline (18) connected into the jet pump is a U-shaped coil pipe.
2. The online monitoring device for the multiple components of the denitration flue gas according to claim 1 is characterized in that a stainless steel protective shell (7) is arranged at the emitting end and the reflecting end of the laser analyzer (3); the inner surface of the air chamber shell (4) is provided with a stainless steel mirror surface inner lining plate (6).
3. A denitration flue gas multicomponent on-line monitoring device according to claim 1, characterized in that the air chamber (8) comprises a temperature control switch (9) for controlling the heating temperature of the air chamber (8).
4. A denitration flue gas multicomponent on-line monitoring device according to claim 1, wherein the inlet of the compressed air line (18) is provided with a gas source pressure regulating filter (12).
5. The online monitoring device for the multiple components of the denitration flue gas according to claim 1, wherein the power distribution cabinet comprises a gas path distributor (1401), a sampling electromagnetic valve (1402), a back-blowing electromagnetic valve (1404), a high-temperature stop valve (1403), a pressure regulating valve (1406), a flow meter (1408), a pressure gauge (1407) and a clamping sleeve regulating valve (1405).
6. The denitration flue gas multicomponent on-line monitoring device according to claim 1, wherein the power distribution control cabinet (14) is provided with a heat radiation grille and a fan (17) at two sides, and a risk protection cover (15) is arranged outside the fan.
7. A denitration flue gas multicomponent on-line monitoring device according to claim 6, characterized in that a filter cotton sheet is filled between the heat radiation grille and the fan (17).
8. The denitration flue gas multicomponent on-line monitoring device according to claim 1, wherein, cabinet support bottom base all fixedly connected with supporting seat (16), the bottom fixedly connected with rubber pad of supporting seat (16), the bottom of cabinet body both sides all fixedly connected with stopper (13).
9. A denitration flue gas multicomponent on-line monitoring device according to claim 1, characterized in that the air chamber housing (4) is provided with a snap lock (5).
10. A denitration flue gas multicomponent on-line monitoring device according to any one of claims 1 to 9, wherein the pipes are 316L stainless steel air pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320987547.XU CN219870886U (en) | 2023-04-27 | 2023-04-27 | Denitration flue gas multicomponent on-line monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320987547.XU CN219870886U (en) | 2023-04-27 | 2023-04-27 | Denitration flue gas multicomponent on-line monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219870886U true CN219870886U (en) | 2023-10-20 |
Family
ID=88323962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320987547.XU Active CN219870886U (en) | 2023-04-27 | 2023-04-27 | Denitration flue gas multicomponent on-line monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219870886U (en) |
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2023
- 2023-04-27 CN CN202320987547.XU patent/CN219870886U/en active Active
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