In-situ extraction type ammonia escape analysis system

Abstract

The utility model discloses an in-situ extraction type ammonia escape analysis system, which comprises a measuring tube, a filter, a detection assembly, an air extraction assembly and an analysis assembly, the measuring tube is fixedly arranged on a flue, a detection cavity is arranged in the measuring tube, the detection cavity extends along the extension direction of the measuring tube, the detection assembly comprises a laser transceiver unit and a reflector, and the laser transceiver unit is connected with the filter. The laser transceiving unit is fixedly arranged at one end of the measuring tube, the filter is fixedly arranged at the other end of the measuring tube, the filter is arranged in the flue, the laser transceiving unit is arranged outside the flue, the detection cavity is communicated with the interior of the filter, the transmitting mirror is arranged at the end, close to the filter, of the detection cavity, and the analysis assembly is in data connection with the laser transceiving unit. The air exhaust assembly is arranged on the measuring tube and is communicated with the detection cavity; the device can rapidly measure ammonia escape, is high in sensitivity, stable in data, small in maintenance amount, low in maintenance cost and low in consumable cost, and meanwhile, reduces the influence of dust in flue gas on detection.

Description

Technical Field

[0001] This utility model relates to the field of denitrification control technology in thermal power generation, specifically to an in-situ extraction ammonia escape analysis system. Background Technology

[0002] The exhaust gas produced by the combustion of fuels (gas, coal, oil) with air is subject to strict environmental control in today's society. In the treatment of nitrogen oxides (NOx), the world uses two denitrification methods: SCR and SNCR. SCR involves injecting NH3 gas into the flue gas in a high-temperature flue gas zone (280℃~430℃). The NH3 gas, under the action of a denitrification catalyst, reduces NO and NO2 in the flue gas to N2 and O2. During this reduction process, the uncatalyzed escaped ammonia in the outlet flue gas needs to be monitored online. If the ammonia escape exceeds 3 ppm, it will cause serious problems such as ammonium bisulfate crystallization and blockage in downstream equipment (air preheater).

[0003] Current methods typically use lasers to detect ammonia escape, which involves placing the laser's emitting and receiving units on the inner walls of the corresponding flue gas ducts. The flue gas between the emitting and receiving units is then directly detected. However, since the flue gas in the ducts usually contains a large amount of dust, this dust content directly affects the laser's detection results. Furthermore, after long-term use, the emitting and receiving units are easily covered with dust, further reducing the accuracy of the detection results.

[0004] In view of the above-mentioned defects, the creator of this utility model has finally obtained this utility model after a long period of research and practice. Utility Model Content

[0005] To address the aforementioned technical deficiencies, this utility model provides an in-situ extraction-type ammonia slip analysis system, comprising a measuring tube, a filter, a detection component, an extraction component, and an analysis component. The measuring tube is fixedly mounted on a flue, and a detection chamber is provided within the measuring tube, extending along the extension direction of the measuring tube. The detection component includes a laser transceiver unit and a reflector. The laser transceiver unit is fixedly mounted at one end of the measuring tube, and the filter is fixedly mounted at the other end. The filter is located inside the flue, and the laser transceiver unit is located outside the flue. The detection chamber communicates with the interior of the filter. The reflector is located at the end of the detection chamber near the filter. The analysis component is data-connected to the laser transceiver unit. The extraction component is mounted on the measuring tube and communicates with the detection chamber.

[0006] Preferably, the exhaust assembly includes a fan, a first connector, and a second connector. The first connector is detachably connected to the measuring tube and communicates with the detection chamber. The first connector is also connected to the fan via a pipe. The fan is fixedly mounted on the flue via the second connector, which communicates with the interior of the flue.

[0007] Preferably, the fan and the first connector are both located outside the flue, and the second connector and the measuring tube are both sealed to the flue.

[0008] Preferably, the measuring tube and the second connector are arranged in a straight line along the flow direction of the flue gas in the flue.

[0009] Preferably, the filter includes a filter cylinder and a filter bag. The filter cylinder is a cylindrical tube with a closed end and an open end at its two ends. The open end is provided with a through hole. The closed end and the arc surface of the filter cylinder are provided with a plurality of filter holes. The end of the third connector is detachably connected to the through hole. The filter bag is fitted over the outside of the filter cylinder, and the opening of the filter bag is provided with a tension rope.

[0010] Preferably, the measuring tube has a first connecting hole and a second connecting hole at both ends, the first connecting hole and the second connecting hole are coaxially arranged, the first connecting hole is a through hole, and a mounting hole is arranged in a ring around the first connecting hole. The laser transceiver unit is fixedly arranged at the end of the measuring tube through the mounting hole, and the transmitting end and receiving end of the laser transceiver unit are both arranged in the detection cavity through the first connecting hole. The second connecting hole is provided with an internal thread, and the third connector is threadedly connected to the second connecting hole.

[0011] Preferably, a mounting block is provided inside the measuring tube, the reflector is disposed on the mounting block, and the mounting block is fixedly disposed inside the second connecting hole.

[0012] Preferably, the mounting block includes a snap-fit ​​section and an extension section, both of which are cylindrical in shape. The cross-sectional diameter of the snap-fit ​​section is larger than that of the extension section. A limiting ring is provided between the second connecting hole and the detection cavity. The cross-sectional diameter of the snap-fit ​​section is matched with the diameter of the second connecting hole. The cross-sectional diameter of the extension section is smaller than the inner diameter of the limiting ring. The reflector is disposed at the end of the extension section, and the snap-fit ​​section is disposed between the limiting ring and the third connector.

[0013] Preferably, a washer is provided between the third connector and the mounting block.

[0014] Preferably, a first flow hole is provided on the axis of the mounting block, and a second flow hole is provided radially through the end of the extension section near the reflector, the second flow hole and the first flow hole being in communication.

[0015] Compared with the prior art, the advantages of this utility model are as follows: This utility model can quickly measure ammonia slip, with high sensitivity, stable data, low maintenance, low maintenance cost and low consumable cost, while reducing the impact of dust in flue gas on detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the in-situ extraction ammonia slip analysis system.

[0017] Figure 2 This is a structural view of the filter;

[0018] Figure 3 This is a structural view of the third connector;

[0019] Figure 4 This is a structural view of the measuring tube.

[0020] The numbers in the diagram represent:

[0021] 1-Measuring tube; 2-Filter; 3-Detection component; 4-Extraction component; 5-Analysis component; 6-Flue; 7-Third connector; 8-Mounting block; 11-Detection chamber; 12-First connecting hole; 13-Second connecting hole; 14-Mounting hole; 15-Limiting ring; 21-Filter cartridge; 22-Filter bag; 23-Pass-through hole; 24-Filter hole; 25-Tension rope; 31-Reflector; 41-Fan; 42-First connector; 43-Second connector; 81-Snap-fit ​​section; 82-Extension section; 83-First flow hole; 84-Second flow hole. Detailed Implementation

[0022] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] like Figure 1 As shown, Figure 1 This is a schematic diagram of the in-situ extraction ammonia escape analysis system.

[0025] The in-situ extraction ammonia escape analysis system of this utility model includes a measuring tube 1, a filter 2, a detection component 3, a gas extraction component 4, and an analysis component 5. The measuring tube 1 is fixedly installed on a flue 6, and a detection chamber 11 is provided inside the measuring tube 1. The detection chamber 11 extends along the extension direction of the measuring tube 1. The detection component 3 includes a laser transceiver unit and a reflector 31. The laser transceiver unit is fixedly installed at one end of the measuring tube 1, and the filter 2 is fixedly installed at the other end. The filter 2 is located inside the flue 6, and the laser transceiver unit is located outside the flue 6. The detection chamber 11 is in communication with the inside of the filter 2. The reflector is located at the end of the detection chamber 11 near the filter 2. The analysis component 5 is connected to the laser transceiver unit for data transmission. The gas extraction component 4 is installed on the measuring tube 1 and communicates with the detection chamber 11.

[0026] The extraction component 4, by extracting air from the detection chamber 11, allows the flue gas in the flue 6 to pass through the filter 2 and enter the detection chamber 11. The laser emitted by the laser transceiver unit enters the detection chamber 11, is absorbed by ammonia molecules in the flue gas, reaches the reflector 31, and is reflected by the reflector 31 and absorbed again by ammonia molecules in the flue gas. The laser transceiver unit performs photoelectric detection and transmits the data to the analysis component 5 for concentration inversion. Meanwhile, since most of the filter 2 is located in the flue 6, the temperature of the detection chamber 11 is the same as the temperature in the flue 6, thereby avoiding detection distortion caused by the flue gas cooling down after entering the detection chamber 11 and reacting.

[0027] Preferably, the exhaust assembly 4 includes a fan 41, a first connector 42, and a second connector 43. The first connector 42 is detachably connected to the measuring tube 1 and communicates with the detection chamber 11. The first connector 42 is connected to the fan 41 through a pipe. The fan 41 is fixedly mounted on the flue 6 through the second connector 43, which communicates with the interior of the flue 6. Thus, the fan 41 can exhaust the gas in the detection chamber 11 into the flue 6 through the pipe.

[0028] The fan 41 and the first connector 42 are both located outside the flue 6, and the second connector 43 and the measuring tube 1 are sealed to the flue 6, thereby effectively preventing the flue gas in the flue 6 from leaking out.

[0029] The measuring tube 1 and the second connector 43 are arranged in a straight line along the flow direction of the flue gas in the flue 6 to avoid the gas discharged from the second connector 43 disturbing the flue gas around the filter 2.

[0030] The filter 2 is connected to the measuring tube 1 via the third connector 7. The third connector 7 and the second connector 43 can be conventional round tube connectors with threads at both ends, or they can be one-way valve connectors, thereby ensuring the directional flow of air.

[0031] This invention can quickly measure ammonia slip, with high sensitivity, stable data, low maintenance, low maintenance costs and low consumable costs, while also reducing the impact of dust in flue gas on detection.

[0032] Example 2

[0033] like Figure 2 As shown, Figure 2 This is a structural view of the filter; the filter 2 includes a filter cylinder 21 and a filter bag 22. The filter cylinder 21 is a cylindrical tube with a closed end and an open end at its two ends, respectively. The open end is provided with a through hole 23, and the closed end and the arc surface of the filter cylinder 21 are provided with a plurality of filter holes 24. The end of the third connector 7 is detachably connected to the through hole 23, and the filter bag 22 is sleeved on the outside of the filter cylinder 21.

[0034] The flue gas in the flue 6 is filtered by the filter bag 22 and then enters the filter cylinder 21 through the filter hole 24 and enters the detection chamber 11 through the third connector 7 of the through hole 23.

[0035] For ease of installation, the cross-section of the third connector 7 installed in the through hole 23 is smaller than the cross-section of the filter cylinder 21, thereby forming a boss between the filter cylinder 21 and the third connector 7. The opening of the filter bag 22 is provided with a tension rope 25. After the filter cylinder 21 is inserted into the filter bag 22 through the opening, the opening can be tightened by the tension rope 25 so that the opening is locked onto the boss, thereby fixing the filter bag 22.

[0036] Example 3

[0037] like Figure 3 and Figure 4 As shown, Figure 3 This is a structural view of the third connector; Figure 4 This is a structural view of the measuring tube.

[0038] The measuring tube 1 has a first connecting hole 12 and a second connecting hole 13 at both ends. The first connecting hole 12 and the second connecting hole 13 are coaxially arranged. The first connecting hole 12 is a through hole. A mounting hole 14 is arranged in a ring around the first connecting hole 12. The laser transceiver unit is fixedly installed at the end of the measuring tube 1 through the mounting hole 14. The transmitting end and receiving end of the laser transceiver unit are both installed in the detection cavity 11 through the first connecting hole 12. The second connecting hole 13 is provided with an internal thread. The third connector 7 is threadedly connected to the second connecting hole 13.

[0039] The measuring tube 1 is provided with a mounting block 8, and the reflector 31 is disposed on the mounting block 8. The mounting block 8 is fixedly disposed in the second connecting hole 13, thereby realizing the fixation of the reflector 31 at the end of the detection cavity 11.

[0040] Specifically, the mounting block 8 includes a snap-fit ​​section 81 and an extension section 82. Both the snap-fit ​​section 81 and the extension section 82 are cylindrical structures, and the cross-sectional diameter of the snap-fit ​​section 81 is larger than that of the extension section 82. A limiting ring 15 is provided between the second connecting hole 13 and the detection cavity 11. The cross-sectional diameter of the snap-fit ​​section 81 is matched with the diameter of the second connecting hole 13. The cross-sectional diameter of the extension section 82 is smaller than the inner diameter of the limiting ring 15. The reflector 31 is disposed at the end of the extension section 82. Through the snap-fit ​​of the snap-fit ​​section 81 and the limiting ring 15, the extension section 82 passes through the limiting ring 15 and extends into the detection cavity 11, thereby realizing the placement of the reflector 31 at the end of the detection cavity 11.

[0041] Since the third connector 7 is threadedly connected to the second connecting hole 13, after the mounting block 8 is placed in the second connecting hole 13, tightening the third connector 7 can compress the mounting block 8 so that the mounting block 8 fits and is fixed to the limiting ring 15, thereby ensuring the stable setting of the reflector 31 at the end of the detection cavity 11.

[0042] Generally, a gasket is provided between the third connector 7 and the mounting block 8. The gasket can improve the airtightness between the third connector 7 and the mounting block 8, while also ensuring that the third connector 7 can smoothly compress the mounting block 8.

[0043] Preferably, a first flow hole 83 is provided on the axis of the mounting block 8, and a second flow hole 84 is provided radially through the end of the extension section 82 near the reflector 31. The second flow hole 84 and the first flow hole 83 are connected, so that the filtered flue gas can enter the detection chamber 11 through the third connector 7 via the first flow hole 83 and the second flow hole 84.

[0044] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. An in-situ extractive ammonia slip analysis system, comprising: The device includes a measuring tube, a filter, a detection component, an extraction component, and an analysis component. The measuring tube is fixedly mounted on a flue and has a detection chamber extending along the measuring tube's extension direction. The detection component includes a laser transceiver unit and a reflector. The laser transceiver unit is fixedly mounted at one end of the measuring tube, and the filter is fixedly mounted at the other end. The filter is located inside the flue, and the laser transceiver unit is located outside the flue. The detection chamber communicates with the interior of the filter. The reflector is located at the end of the detection chamber near the filter. The analysis component is data-connected to the laser transceiver unit. The extraction component is mounted on the measuring tube and communicates with the detection chamber.

2. The in-situ extractable ammonia slip analysis system of claim 1, wherein, The air extraction assembly includes a fan, a first connector, and a second connector. The first connector is detachably connected to the measuring tube and communicates with the detection chamber. The first connector is also connected to the fan via a pipe. The fan is fixedly mounted on the flue via the second connector, which communicates with the interior of the flue.

3. The in-situ extractable ammonia slip analysis system of claim 2, wherein, The fan and the first connector are both located outside the flue, and the second connector and the measuring tube are both sealed to the flue.

4. The in-situ extractable ammonia slip analysis system of claim 2, wherein, The measuring tube and the second connector are arranged in a straight line along the flow direction of the flue gas.

5. The in-situ extractable ammonia slip analysis system of claim 1, wherein, The filter includes a filter cylinder and a filter bag. The filter cylinder is a cylindrical tube with a closed end and an open end at its two ends. The open end is provided with a through hole. The closed end and the arc surface of the filter cylinder are provided with a plurality of filter holes. The end of the third connector is detachably connected to the through hole. The filter bag is fitted over the filter cylinder and the opening of the filter bag is provided with a tension rope.

6. The in-situ extractable ammonia slip analysis system of claim 5, wherein, The measuring tube has a first connecting hole and a second connecting hole at both ends. The first connecting hole and the second connecting hole are coaxially arranged. The first connecting hole is a through hole. A mounting hole is arranged in a ring around the first connecting hole. The laser transceiver unit is fixedly installed at the end of the measuring tube through the mounting hole. The transmitting end and receiving end of the laser transceiver unit are both installed in the detection cavity through the first connecting hole. The second connecting hole has an internal thread. The third connector is threadedly connected to the second connecting hole.

7. The in-situ extractable ammonia slip analysis system of claim 6, wherein, A mounting block is provided inside the measuring tube, the reflector is mounted on the mounting block, and the mounting block is fixedly installed inside the second connecting hole.

8. The in-situ extractable ammonia slip analysis system of claim 7, wherein, The mounting block includes a snap-fit ​​section and an extension section, both of which are cylindrical in shape. The cross-sectional diameter of the snap-fit ​​section is larger than that of the extension section. A limiting ring is provided between the second connecting hole and the detection cavity. The cross-sectional diameter of the snap-fit ​​section is matched with the diameter of the second connecting hole. The cross-sectional diameter of the extension section is smaller than the inner diameter of the limiting ring. The reflector is located at the end of the extension section, and the snap-fit ​​section is located between the limiting ring and the third connector.

9. The in-situ extraction ammonia slip analysis system as described in claim 8, characterized in that, A gasket is provided between the third connector and the mounting block.

10. The in-situ extraction ammonia slip analysis system as described in claim 8, characterized in that, A first flow hole is provided on the axis of the mounting block, and a second flow hole is provided radially through the end of the extension section near the reflector, and the second flow hole and the first flow hole are connected.

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