Ammonia nitrogen oxygen integrated monitoring full cross-section sampling device

Abstract

The application discloses an ammonia-nitrogen-oxygen integrated monitoring full-section sampling device, which comprises a sampling rod inserted into a flue, the sampling rod comprises a gas conveying section, a sampling section and an extension section which are sequentially connected, a sampling disc is connected to the other end of the gas conveying section, and an air inlet nozzle is arranged on the side surface of the sampling section; the inner diameter of the sampling section is smaller than that of the gas conveying section, an inner taper thread is arranged at the connecting position of the sampling section and the gas conveying section, a smoke filter is connected by the inner taper thread, and the smoke filter is arranged in the sampling rod; a high-temperature-resistant smoke filtering material is arranged in the smoke filter, a tail section for dismounting is arranged at one end of the smoke filter, a spare plug is connected to the other end, and the spare plug is movably arranged in the sampling rod. The beneficial effects of the scheme can be known according to the description of the scheme, smoke dust in the flue can be effectively prevented from entering the sampling rod and parts behind the sampling rod, so that blockage is avoided, the smoke filter can be directly replaced at the outer end of the sampling rod without stopping production, and the continuity of production is ensured.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology, and in particular to a full-section sampling device for integrated monitoring of ammonia, nitrogen and oxygen. Background Technology

[0002] Currently, large power plants commonly use SCR denitrification devices to reduce NO in flue gas. x Emission concentration. SCR utilizes NH3 to reduce NO. x The reducing properties of NO, under the action of a catalyst, reduce NO x It is reduced to environmentally harmless N2 and H2O. However, in actual operation, controlling the ammonia injection rate is crucial; increasing the ammonia injection rate helps reduce NO. x While emission concentrations increase, ammonia slip rates also rise, leading to blockages and corrosion in downstream air preheaters due to ammonium bisulfate deposits. Accurate monitoring and assessment of ammonia slip rates are crucial feedback signals for ammonia injection control. Current technologies typically install NO... x Measuring equipment and NH3 measuring equipment are used to monitor and assess ammonia slip rate. Monitoring oxygen content is also crucial; too low an oxygen content may lead to incomplete combustion, affecting boiler efficiency, while too high an oxygen content will increase flue gas heat loss and reduce thermal efficiency. Oxygen content also directly affects nitrogen oxides (NOx). x The formation of pollutants such as nitrogen and oxygen is influenced by both excessively high and low oxygen levels, which can promote the reaction of nitrogen with oxygen to produce NO. x By properly controlling the oxygen content, combustion conditions can be optimized, reducing emissions of pollutants such as sulfur dioxide (SO2) and carbon monoxide (CO).

[0003] Existing flue gas sampling methods typically involve installing a sampling rod in the flue and connecting a negative pressure generator to the outer end of the sampling rod to extract the flue gas. However, flue gas contains a lot of dust, and ammonia slip monitoring is performed continuously, making it easy for dirt to accumulate at the plug location or inside the sampling rod, causing blockages. Moreover, it is difficult to clean the dirt without interrupting production. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing an integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device. It effectively prevents dust from entering the sampling rod and its rear components, thus avoiding blockages. Furthermore, the filter element can be replaced directly at the outer end of the sampling rod without production shutdown, further enhancing the aforementioned technical benefits. A spare plug is provided to prevent external flue gas from entering the sampling rod during filter replacement, thus preventing dust ingress and gas leakage.

[0005] To achieve the above objectives, this utility model provides an integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device, including a sampling rod extending into the flue, an air inlet provided on the side of the sampling rod facing away from the flue flow direction, a smoke filter connected to the air inlet, and the smoke filter disposed inside the sampling rod; The filter element is equipped with a high-temperature resistant filter material. One end of the filter element is provided with a tail section for disassembly and assembly, and the other end is connected to a spare plug. The spare plug is movably disposed inside the sampling rod.

[0006] Furthermore, the sampling rod includes a gas delivery section, a sampling section and an extension section connected in sequence, and a sampling disk is connected to the other end of the gas delivery section. A working hole is provided on the other side of the sampling disk. The air inlet is provided on the side of the sampling section; The inner diameter of the sampling section is smaller than that of the gas transmission section. An internal tapered thread is provided at the connection between the sampling section and the gas transmission section, and the filter element is connected by the internal tapered thread.

[0007] Furthermore, the filter element includes a cylindrical section, an external tapered thread section, and a tail section connected in sequence. The filter element is provided with an inner cavity that opens at the end of the tail section, and the high-temperature resistant filter material is disposed in the inner cavity. The cylindrical section is connected to the air inlet, and the cylindrical section is provided with a strip-shaped vent hole that connects the inner cavity to the air inlet. The external tapered thread section is threadedly connected to the sampling rod. The diameter of the tail section is smaller than the inner diameter of the gas transmission section, and the inner wall of the tail section is provided with a groove or through hole for disassembly and assembly.

[0008] Furthermore, a step is provided between the extension section and the sampling section, the inner diameter of the sampling section is smaller than that of the extension section, and the extension section is movably connected to the spare plug.

[0009] Furthermore, the spare plug is cylindrical, and the spare plug has a through cylindrical hole along the central axis. The end of the cylindrical hole near the sampling section has a chamfer, and the end of the spare plug away from the sampling section has a protruding ring. The filter element is provided with a connecting post, which is connected to the cylindrical hole.

[0010] Furthermore, when the spare plug is connected to the sampling section, it is a clearance fit, and the spare plug has an external thread on its outer side for forming a clearance seal.

[0011] Furthermore, a retaining ring is provided at the end of the extension section away from the gas delivery section.

[0012] This solution also includes a disassembly and assembly mechanism, which includes a sleeve with a handle at the end; a hook is connected to the front of the inner wall of the sleeve, and the front end of the hook extends out of the sleeve. The hook is made of spring steel; a matching rod is movably installed inside the sleeve, with a handle at the end of the matching rod.

[0013] The beneficial effects of this solution can be understood from the description of the above solution. Compared with the prior art, it has the following beneficial effects: (1) It can effectively prevent smoke and dust in the flue from entering the sampling rod and the components behind the sampling rod, thereby avoiding blockage; (2) The filter element can be replaced directly at the outer end of the sampling rod without stopping production, thus ensuring the continuity of production; (3) Set up a spare plug so as to prevent external flue gas from rushing into the sampling rod when replacing the filter element, so as to prevent dust from entering and flue gas from leaking to the outside; (4) The sampling rod and the filter element are connected by a tapered thread, which not only forms a seal, but also facilitates the filter element to freely enter and exit the sampling rod when the seal is achieved due to the different diameters at both ends of the tapered thread. (5) The spare plug is connected to the filter element by a cylindrical hole and a connecting column. On the one hand, it does not affect the twisting when the filter element is installed and removed; on the other hand, it can take advantage of the thermal expansion and contraction of the connecting column. When the connecting column is at room temperature during installation, it is easy to insert into the cylindrical hole. When the filter element is removed, the connecting column is at high temperature, which puts a certain pressure on the cylindrical hole, so the connecting column can be used to pull the spare plug. (6) The spare plug is provided with external threads on the outside to form a gap seal. This way, even if the spare plug and the sampling section are in a gap fit, the flue gas can still be effectively prevented from passing through. (7) The use of the rod not only allows the hook of the pull member to be inserted into the tail section of the filter element by compression, but also the compression of the rod can effectively prevent the pull member from twisting during rotation, further preventing the pull member from failing to provide the filter element with sufficient torsional force. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the sampling rod of this utility model; Figure 3 This is a schematic diagram of the structure of the filter element of this utility model; Figure 4 This is a schematic diagram of the structure of the spare plug of this utility model; Figure 5 This is a schematic diagram of the disassembly and assembly mechanism of this utility model; Figure 6 The figure shows a schematic diagram of the disassembly and assembly mechanism of this utility model when the sampling rod is inserted; Figure 7 The figure shows a schematic diagram of the structure of the disassembly and assembly mechanism of this utility model when the pull member is embedded in the tail section of the smoke filter.

[0015] In the diagram, 1. Sampling rod; 11. Gas delivery section; 12. Sampling section; 13. Extension section; 14. Internal tapered thread; 15. Step; 16. Retaining ring; 2. Air inlet; 3. Smoke filter; 31. High-temperature resistant smoke filter material; 32. Tail section; 33. Cylindrical section; 34. External tapered thread section; 35. Strip-shaped vent hole; 36. Through hole; 37. Connecting post; 4. Spare plug; 41. Cylindrical hole; 42. Ring; 43. External thread; 5. Sampling disc; 51. Working hole; 6. Disassembly and assembly mechanism; 61. Sleeve; 62. Handle one; 63. Hook; 64. Matching rod; 65. Handle two. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0017] like Figure 1 As shown, this embodiment is an integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device, including a sampling rod 1 extending into the flue. An air inlet 2 is provided on the side of the sampling rod 1 facing away from the flue gas flow direction. The air inlet 2 is connected to a smoke filter 3, which is disposed inside the sampling rod 1. The smoke filter 3 is provided with a high-temperature resistant smoke filter material 31 inside. One end of the smoke filter 3 is provided with a tail section 32 for disassembly and assembly, and the other end is connected to a spare plug 4, which is movably disposed inside the sampling rod 1.

[0018] like Figure 2 As shown, the sampling rod 1 includes a gas delivery section 11, a sampling section 12, and an extension section 13 connected in sequence. The other end of the gas delivery section 11 is connected to a sampling disk 5, and a working hole 51 is provided on the other side of the sampling disk 5. An air inlet is provided on the side of the sampling section 12. The inner diameter of the sampling section 12 is smaller than that of the gas delivery section 11. An internal tapered thread 14 is provided at the connection between the sampling section 12 and the gas delivery section 11, and the filter element 3 is connected by the internal tapered thread 14.

[0019] A step 15 is provided between the extension section 13 and the sampling section 12. The inner diameter of the sampling section 12 is smaller than that of the extension section 13. The extension section 13 is movably connected to the spare plug 4. A retaining ring 16 is provided at the end of the extension section 13 away from the gas transmission section 11.

[0020] like Figure 3As shown, the smoke filter element 3 includes a cylindrical section 33, an externally tapered threaded section 34, and a tail section 32 connected in sequence. The smoke filter element 3 has an inner cavity with an opening at the end of the tail section 32, and a high-temperature resistant smoke filter material 31 is placed in the inner cavity. The cylindrical section 33 is connected to the air inlet 2, and the cylindrical section 33 has a strip-shaped vent hole 35 that connects the inner cavity to the air inlet 2. The externally tapered threaded section 34 is threadedly connected to the sampling rod 1. The diameter of the tail section 32 is smaller than the inner diameter of the gas delivery section 11, and the inner wall of the tail section 32 has a through hole 36 for disassembly and assembly. The smoke filter element 3 is provided with a connecting post 37 for connecting to the spare plug 4.

[0021] like Figure 4 As shown, the spare plug 4 is cylindrical, with a through cylindrical hole 41 along its central axis. The cylindrical hole 41 is used to connect with the connecting post 37. The end of the cylindrical hole 41 near the sampling section 12 has a chamfer, and the end of the spare plug 4 away from the sampling section 12 has a protruding ring 42. When the spare plug 4 is connected to the sampling section 12, it is a clearance fit. The outer side of the spare plug 4 has an external thread 43 for forming a clearance seal.

[0022] like Figure 5 As shown, the disassembly and assembly mechanism 6 includes a sleeve 61, with a handle 62 at the tail of the sleeve 61; a hook 63 is connected to the front of the inner wall of the sleeve 61, with the front end of the hook 63 extending out of the sleeve 61, and the hook 63 is made of spring steel; a matching rod 64 is movably arranged inside the sleeve 61, with a handle 65 at the tail of the matching rod 64.

[0023] Large-scale flues require full-section sampling, with each point evenly covering the cross-section. This solves the problem of insufficient representativeness of traditional single-point sampling. Multiple sets of the above-mentioned sampling structures are installed according to the design points to achieve full-section sampling.

[0024] Because the filter element 3 is directly installed at the air inlet 2, it is difficult for smoke and dust to enter the sampling rod 1. Under normal circumstances, high-pressure air backflushing can remove most of the smoke and dust blocked at the filter element 3. However, over time, some smoke and dust inevitably enter the pores of the high-temperature resistant filter material 31, forming stubborn dirt. At this point, it is necessary to replace the filter element 3. In this solution, when replacing the filter element 3, the working hole 51 of the sampling disc 5 is opened, and the disassembly and assembly mechanism 6 is inserted through the working hole 51 until the end of the sleeve 61 abuts against the tail section 32 of the filter element 3. At this time, if Figure 6 As shown, the hook head of the hook part 63 corresponds to the through hole 36 of the tail section 32 for disassembly and assembly.

[0025] The worker pushes the connecting rod 64, which moves forward and pushes open the spring steel hook part 63, as if... Figure 7As shown, the hook head of the pull hook 63 is inserted into the through hole 36. Then, the operator rotates the sleeve 61, and the pull hook 63 will unscrew the threaded connection between the smoke filter 3 and the sampling rod 1. Then, the operator pulls the sleeve 61 to pull out the smoke filter 3.

[0026] At room temperature, the connecting post 37 of the filter element 3 has a sliding gap with the cylindrical hole 41 of the spare plug 4. However, due to thermal expansion at high temperatures in the flue, compression will occur between the connecting post 37 and the cylindrical hole 41. Therefore, when the filter element 3 is pulled, the spare plug 4 will be dragged and block the air inlet 2 until the protruding ring 42 of the spare plug 4 abuts against the step 15 at the end of the sampling section 12. At this point, if the filter element 3 is pulled further, the pulling force will overcome the frictional force, causing the connecting post 37 to slide out of the cylindrical hole 41.

[0027] When the new filter element 3 is inserted into the sampling rod 1, the connecting post 37 at room temperature easily enters the cylindrical hole 41. As the filter element 3 continues to penetrate deeper, it pushes the spare plug 4 into the extension section 13. The retaining ring 16 in the extension section 13 prevents the spare plug 4 from sliding out too far.

[0028] The technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this utility model, and this utility model is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A full-section sampling device for integrated monitoring of ammonia, nitrogen, and oxygen, characterized in that, Includes a sampling rod that extends into the flue, with an air inlet on the side of the sampling rod facing away from the flue flow direction, the air inlet being connected to a smoke filter, and the smoke filter being disposed inside the sampling rod; The filter element is equipped with a high-temperature resistant filter material. One end of the filter element is provided with a tail section for disassembly and assembly, and the other end is connected to a spare plug. The spare plug is movably disposed inside the sampling rod.

2. The integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device according to claim 1, characterized in that, The sampling rod includes a gas delivery section, a sampling section and an extension section connected in sequence. The other end of the gas delivery section is connected to a sampling disk, and a working hole is provided on the other side of the sampling disk. The air inlet is provided on the side of the sampling section; The inner diameter of the sampling section is smaller than that of the gas transmission section. An internal tapered thread is provided at the connection between the sampling section and the gas transmission section, and the filter element is connected by the internal tapered thread.

3. The integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device according to claim 2, characterized in that, The filter element includes a cylindrical section, an external tapered thread section and a tail section connected in sequence. The filter element is provided with an inner cavity that opens at the end of the tail section, and the high-temperature resistant filter material is disposed in the inner cavity. The cylindrical section is connected to the air inlet, and the cylindrical section is provided with a strip-shaped vent hole that connects the inner cavity to the air inlet. The external tapered thread section is threadedly connected to the sampling rod. The diameter of the tail section is smaller than the inner diameter of the gas transmission section, and the inner wall of the tail section is provided with a groove or through hole for disassembly and assembly.

4. The integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device according to claim 2, characterized in that, A step is provided between the extension section and the sampling section. The inner diameter of the sampling section is smaller than that of the extension section. The extension section is movably connected to the spare plug.

5. The integrated ammonia nitrogen and oxygen monitoring full-section sampling device according to claim 4, characterized in that, The spare plug is cylindrical, and the spare plug has a through cylindrical hole along the central axis. The end of the cylindrical hole near the sampling section has a chamfer, and the end of the spare plug away from the sampling section has a protruding ring. The filter element is provided with a connecting post, which is connected to the cylindrical hole.

6. The integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device according to claim 5, characterized in that, When the spare plug is connected to the sampling section, it is in clearance fit, and the spare plug has an external thread on its outer side to form a clearance seal.

7. The integrated ammonia, nitrogen, and oxygen monitoring full-section sampling device according to claim 4, characterized in that, A retaining ring is provided at the end of the extension section away from the gas transmission section.

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