Anti-blocking pressure detection device for industrial furnace flue
Patent Information
- Application Number
- CN202522212132.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-20
AI Technical Summary
[0004]为了解决取样管与工业炉烟道垂直连接，很容易造成烟灰积聚到取压管内使其堵塞，导致烟气压力不能正确显示，检测精度低；以及冷凝水在引压管内积聚的技术问题，本实用新型提供了一种工业炉烟道用防堵压力检测装置，结构简单，便于安装，差压变送器始终能正常检测高温高粉尘烟气的压力，保证高温高粉尘烟气压力正确显示，冷凝水会靠自身重力从取样管中流入烟道内，并且烟灰与冷凝水形成硫结石也顺着冷凝水流入烟道内，取样管不会再堵塞，冷凝水也不会再积聚在引压管内，提高检测精度，避免引压管被腐蚀，大大减少维修量
本实用新型的防堵压力检测装置，结构简单，便于安装，差压变送器始终能正常检测高温高粉尘烟气的压力，保证高温高粉尘烟气压力正确显示，提高检测精度，冷凝水会靠自身重力从取样管中流入烟道内，并且烟灰与冷凝水形成硫结石也顺着冷凝水流入烟道内，取样管不会再堵塞，冷凝水也不会再积聚在引压管内，避免引压管被腐蚀，大大减少维修量。
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Figure CN224839225U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial furnace flue pressure detection technology, specifically to an anti-clogging pressure detection device for industrial furnace flues. Background Technology
[0002] In the production process, the negative pressure of industrial furnaces and waste heat boilers is an important indicator for process control. It not only reflects the reaction of materials inside the furnace but also the heat exchange efficiency of the boiler. At the outlet of industrial furnaces (such as bottom-blown furnaces, rotary kilns, and side-blown furnaces), the flue gas temperature is high and the dust content is high. After the high-temperature, high-dust flue gas cools, (acidic) condensate is released. When the flue gas encounters the condensate, it becomes sticky and adheres to the wall of the sampling tube, causing blockage. This will result in the subsequent flue gas pressure not being displayed correctly.
[0003] Typically, a sampling tube and a pressure tap are installed at the pressure tapping port of an industrial furnace flue, connecting to a pressure measuring instrument for flue pressure detection. Because the pressure tapping port is perpendicular to the flue, the sampling tube is also perpendicular to the flue. This easily leads to the accumulation of soot in the pressure tapping tube, causing blockage. Specifically, soot in the high-temperature, high-dust flue gas reacts with condensate to form sulfur deposits, clogging the sampling tube and resulting in inaccurate flue gas pressure readings and low detection accuracy. Furthermore, the pressure tapping tube is installed from top to bottom; blockage of the sampling tube causes condensate to accumulate inside, and the acidic condensate easily corrodes the pressure tapping tube. Therefore, there is an urgent need for an anti-clogging pressure detection device for industrial furnace flues to solve these problems. Utility Model Content
[0004] To address the technical issues of vertical connection between the sampling tube and the industrial furnace flue, which easily leads to the accumulation of soot in the pressure tapping tube, causing blockage and resulting in inaccurate flue gas pressure display and low detection accuracy, as well as the accumulation of condensate in the pressure tapping tube, this invention provides an anti-blockage pressure detection device for industrial furnace flues. This device features a simple structure, is easy to install, and ensures the differential pressure transmitter can consistently and accurately detect the pressure of high-temperature, high-dust flue gas, guaranteeing correct pressure display. Condensate flows from the sampling tube into the flue due to gravity, and the sulfur deposits formed by the soot and condensate also flow into the flue along with the condensate. This prevents further blockage of the sampling tube and condensate accumulation in the pressure tapping tube, improving detection accuracy, preventing corrosion of the pressure tapping tube, and significantly reducing maintenance.
[0005] This utility model provides an anti-clogging pressure detection device for industrial furnace flues, including a sampling tube, a pressure tapping tube, and a differential pressure transmitter. The industrial furnace flue is provided with a pressure tapping oblique hole. One end of the sampling tube is inserted into the pressure tapping oblique hole and communicates with the industrial furnace flue. The sampling tube is inclined. The other end of the sampling tube is located outside the industrial furnace flue and is threadedly connected to a plug. A ball valve is provided on the sampling tube and is located outside the industrial furnace flue. The ball valve is fixedly connected to one end of the pressure tapping tube. A needle valve is provided at the other end of the pressure tapping tube. The needle valve is fixedly connected to the differential pressure transmitter, which is located above the sampling tube.
[0006] Furthermore, a heat insulation layer with a thickness of 15cm is fixedly installed on the industrial furnace flue. A pressure tapping oblique hole communicating with the industrial furnace flue is perforated through the heat insulation layer. One end of the sampling tube is inserted into the pressure tapping oblique hole. The purpose of the heat insulation layer is to reduce the temperature difference between the two ends of the sampling tube, minimizing the cooling of the high-temperature, high-dust flue gas, thereby enabling the differential pressure transmitter to detect the true pressure of the high-temperature, high-dust flue gas in the industrial furnace flue and improving detection accuracy.
[0007] Furthermore, the sampling tube is 20cm long, and the angle between the sampling tube and the industrial furnace flue is greater than 30°.
[0008] Furthermore, multiple pressure tapping orifices are provided, arranged in a row with the inclination of the multiple pressure tapping orifices increasing sequentially. One end of the sampling tube is inserted into one of the pressure tapping orifices. Multiple sealing plates are rotatably arranged on the industrial furnace flue, and the sealing plates cover the pressure tapping orifices.
[0009] Furthermore, a support frame is fixedly installed on the industrial furnace flue, and a support base is rotatably mounted on the support frame at an angle. The support base has an arc-shaped groove, and the other end of the sampling tube is located in the arc-shaped groove of the support base. The support base rotates according to the inclination of the sampling tube and then remains stationary, with the other end of the sampling tube located in the arc-shaped groove of the support base, thus supporting the sampling tube. The support base supports the sampling tube, which in turn supports the pressure tapping pipe and the differential pressure transmitter, ensuring the stability of the anti-clogging pressure detection device during use.
[0010] Furthermore, a rotating rod is rotatably mounted on the support frame, and a fixing sleeve is fixedly mounted on the support base and fixedly connected to the rotating rod. A first ring block is fixedly mounted on the support frame, and the first ring block has multiple first screw holes arranged in a ring. The end of the rotating rod passes through the first ring block and has a second ring block on it. The second ring block has a second screw hole, and a bolt passes through the second screw hole and one of the first screw holes in sequence. Loosening the bolt and rotating the rotating rod adjusts the position of the bolt, thereby adjusting the angle of the support base. Conversely, tightening the bolt fixes the rotating rod and the support base in place.
[0011] Furthermore, the other end of the sampling tube is provided with an external thread, and the inner wall of the plug is provided with an internal thread that matches the external thread. The plug is threadedly connected to the other end of the sampling tube through the external and internal threads. Even if (acidic) condensate is released after the high-temperature, high-dust flue gas cools, the condensate in the sampling tube cannot corrode the external and internal threads, and the sulfur stones formed by the soot and condensate will not solidify on the external and internal threads, ensuring that the plug can be disassembled normally.
[0012] Compared with the prior art, the present invention has the following beneficial effects: This utility model's anti-clogging pressure detection device has a simple structure and is easy to install. The differential pressure transmitter can always detect the pressure of high-temperature, high-dust flue gas normally, ensuring the correct display of the high-temperature, high-dust flue gas pressure and improving detection accuracy. The condensate will flow into the flue from the sampling tube by its own gravity, and the sulfur stones formed by the soot and condensate will also flow into the flue along with the condensate. The sampling tube will no longer be blocked, and the condensate will no longer accumulate in the pressure tapping tube, avoiding corrosion of the pressure tapping tube and greatly reducing maintenance. Attached Figure Description
[0013] Figure 1 This is a side sectional view of the anti-clogging pressure detection device for industrial furnace flues according to this utility model. Figure 2 This is a schematic diagram of the sealing plate of this utility model; Figure 3 This is a structural schematic diagram of the support base of this utility model; Figure 4 This is a cross-sectional structural schematic diagram of the rotating rod of this utility model; The numbers in the attached diagram are: 1. Sampling tube; 11. Ball valve; 2. Pressure tapping tube; 21. Needle valve; 3. Differential pressure transmitter; 4. Plug; 5. Industrial furnace flue; 51. Insulation layer; 511. Pressure tapping oblique hole; 6. Sealing plate; 7. Support frame; 71. Rotating rod; 711. Second ring block; 72. First ring block; 721. First screw hole; 8. Support base; 81. Fixing sleeve. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0015] like Figures 1-4 As shown, an anti-clogging pressure detection device for an industrial furnace flue 5 includes a sampling tube 1, a pressure tapping tube 2, and a differential pressure transmitter 3. The industrial furnace flue 5 is provided with a pressure tapping oblique hole 511. One end of the sampling tube 1 is inserted into the pressure tapping oblique hole 511 and communicates with the industrial furnace flue 5. The sampling tube 1 is inclined. The other end of the sampling tube 1 is located outside the industrial furnace flue 5 and is threadedly connected to a plug 4. A ball valve 11 is provided on the sampling tube 1 and is located outside the industrial furnace flue 5. The ball valve 11 is fixedly connected to one end of the pressure tapping tube 2. The other end of the pressure tapping tube 2 is provided with a needle valve 21. The needle valve 21 is fixedly connected to the differential pressure transmitter 3, which is located above the sampling tube 1. The structure and operation of the differential pressure transmitter 3 are existing technologies and will not be described in detail here. It should be noted that the dimensions of sampling tube 1 and pressure tapping orifice 511 are matched. After one end of sampling tube 1 is inserted into pressure tapping orifice 511, sampling tube 1 is tilted and remains stable. Preferably, the pressure tapping tube is a DN25 stainless steel tube. The pressure tapping tube 2 is a DN10 stainless steel tube. The differential pressure transmitter 3 is an EJA diaphragm differential pressure transmitter. The ball valve 11 is a DN25 ball valve, which allows condensate or sulfur deposits formed by condensate and soot to pass smoothly through the ball valve 11, preventing ash accumulation inside the ball valve 11. The needle valve 21 is a DN15 needle valve.
[0016] The working process of the anti-clogging pressure detection device: When ball valve 11 and needle valve 21 are open, the high-temperature, high-dust flue gas in the industrial furnace flue 5 flows through sampling pipe 1 and pressure tapping pipe 2 to the location of differential pressure transmitter 3, which detects the pressure of the flue gas. When ball valve 11 and needle valve 21 are closed, differential pressure transmitter 3 does not detect. The dual setting of ball valve 11 and needle valve 21 ensures that only gas from the high-temperature, high-dust flue gas flows to differential pressure transmitter 3, allowing differential pressure transmitter 3 to detect the true pressure of the high-temperature, high-dust flue gas in industrial furnace flue 5.
[0017] Because sampling tube 1 is inclined, although (acidic) condensate is released after the high-temperature, high-dust flue gas cools, the condensate will flow into the industrial furnace flue 5 through sampling tube 1 by its own gravity. Furthermore, the sulfur deposits formed by the ash and condensate also flow into the industrial furnace flue 5 along with the condensate, preventing sampling tube 1 from becoming blocked. The differential pressure transmitter 3 can always detect the pressure of the high-temperature, high-dust flue gas normally, ensuring accurate pressure display. Condensate will also not accumulate in pressure tapping tube 2, preventing corrosion and significantly reducing maintenance. The differential pressure transmitter 3 is located above sampling tube 1, preventing ash and condensate from accumulating at the pressure transmitter location and affecting its normal detection.
[0018] After long-term use, the plug 4 can be removed to inspect and repair the sampling tube 1.
[0019] The anti-clogging pressure detection device in this embodiment has a simple structure and is easy to install. The differential pressure transmitter 3 can always detect the pressure of high-temperature, high-dust flue gas normally, ensuring the correct display of the high-temperature, high-dust flue gas pressure and improving detection accuracy. The condensate will flow into the industrial furnace flue 5 from the sampling tube 1 by its own gravity, and the sulfur stones formed by the soot and condensate will also flow into the industrial furnace flue 5 along with the condensate. The sampling tube 1 will no longer be blocked, and the condensate will no longer accumulate in the pressure tapping tube 2, avoiding corrosion of the pressure tapping tube 2 and greatly reducing maintenance.
[0020] As one possible implementation, a heat insulation layer 51 is fixedly installed on the industrial furnace flue 5. The heat insulation layer 51 has a thickness of 15cm, and a pressure tapping oblique hole 511 communicating with the industrial furnace flue 5 is provided through the heat insulation layer 51. One end of the sampling tube 1 is inserted into the pressure tapping oblique hole 511. The purpose of the heat insulation layer 51 is to reduce the temperature difference between the two ends of the sampling tube 1, to avoid cooling of the high-temperature, high-dust flue gas as much as possible, and thus enable the differential pressure transmitter 3 to detect the true pressure of the high-temperature, high-dust flue gas in the industrial furnace flue 5, thereby improving the detection accuracy.
[0021] Furthermore, a sealing ring is provided in the pressure tapping inclined hole 511, and the sealing ring contacts the sampling tube 1 to prevent high-temperature and high-dust flue gas in the industrial furnace flue 5 from leaking between the pressure tapping inclined hole 511 and the sampling tube 1.
[0022] In one possible implementation, the sampling tube 1 is 20cm long, and the angle formed between the sampling tube 1 and the industrial furnace flue 5 is greater than 30°. Preferably, when inserting the sampling tube 1, as much of the sampling tube 1 as possible is located inside the insulation layer 51. Generally, only the external thread on the sampling tube 1 remains outside the insulation layer 51. This is done to reduce the temperature difference between the two ends of the sampling tube 1, thereby enabling the differential pressure transmitter 3 to detect the true pressure of the high-temperature, high-dust flue gas in the industrial furnace flue 5, improving detection accuracy. Furthermore, the length of the pressure tapping tube is set as short as possible to reduce pipe resistance, thereby improving detection accuracy.
[0023] It should be noted that the angle between the sampling tube 1 and the industrial furnace flue 5 is determined by the pressure tapping orifice 511. In other words, the inclination of the pressure tapping orifice 511 determines the inclination of the sampling tube 1. The angle between the sampling tube 1 and the industrial furnace flue 5 is greater than 30° to ensure that the condensate can flow from the sampling tube 1 into the industrial furnace flue 5 by its own gravity, and the sulfur deposits formed by the soot and condensate also flow into the industrial furnace flue 5 along with the condensate.
[0024] In one possible implementation, multiple pressure tapping orifices 511 are provided, arranged in a row with their inclinations increasing sequentially. One end of the sampling tube 1 is inserted into one of the pressure tapping orifices 511. Multiple sealing plates 6 are rotatably mounted on the industrial furnace flue 5 via hinges, covering the pressure tapping orifices 511. In this embodiment, four pressure tapping orifices 511 can be provided, with inclinations of 45°, 50°, 55°, and 60°, respectively. However, these are not the only possible inclinations listed here. Opening one sealing plate 6 allows one end of the sampling tube 1 to be inserted into that pressure tapping orifice 511, while the other sealing plates 6 remain closed to prevent leakage of high-temperature, high-dust flue gas. Based on the amount of soot in the high-temperature, high-dust flue gas in the industrial furnace flue 5, one end of the sampling tube 1 is inserted into one of the pressure tapping inclined holes 511. The other pressure tapping inclined holes 511 are not used, and the corresponding sealing plates 6 are closed. Condensate and sulfur stones formed by soot and condensate also flow quickly into the industrial furnace flue 5 along with the condensate.
[0025] In one possible implementation, a support frame 7 is fixedly installed on the industrial furnace flue 5. A support base 8 is rotatably mounted on the support frame 7 and is inclined. The support base 8 has an arc-shaped groove, and the other end of the sampling tube 1 is located in the arc-shaped groove of the support base 8. The support base 8 rotates according to the inclination of the sampling tube 1 and then remains fixed, with the other end of the sampling tube 1 located in the arc-shaped groove of the support base 8, thus supporting the sampling tube 1. The support base 8 supports the sampling tube 1, which in turn supports the pressure tapping pipe 2 and the differential pressure transmitter 3, ensuring the stability of the anti-clogging pressure detection device during use.
[0026] In one possible implementation, a rotating rod 71 is rotatably mounted on the support frame 7, and a fixing sleeve 81 is fixedly mounted on the support base 8 and fixedly connected to the rotating rod 71. A first ring block 72 is fixedly mounted on the support frame 7, and the first ring block 72 has multiple first screw holes 721 arranged in a ring. The end of the rotating rod 71 passes through the first ring block 72 and has a second ring block 711 thereon. The second ring block 711 has a second screw hole, and a bolt passes through the second screw hole and one of the first screw holes 721 in sequence. Loosening the bolt and rotating the rotating rod 71 adjusts the position of the bolt, thereby adjusting the angle of the support base 8; conversely, tightening the bolt fixes the rotating rod 71 and the support base 8 in place.
[0027] Preferably, two bearing seats are fixedly installed on the support frame 7, and the two ends of the rotating rod 71 pass through the bearings in the two bearing seats respectively and are fixedly connected to them to achieve rotation.
[0028] Preferably, the fixing sleeve 81 is provided with an opening, the support rod passes through the opening on the fixing sleeve 81, and the support base 8 is fixed on the support rod.
[0029] In one possible implementation, the other end of the sampling tube 1 is provided with an external thread, and the inner wall of the plug 4 is provided with an internal thread that matches the external thread. The plug 4 is threadedly connected to the other end of the sampling tube 1 through the external and internal threads. Even if (acidic) condensate is released after the high-temperature, high-dust flue gas cools, the condensate in the sampling tube 1 cannot corrode the external and internal threads, and the sulfur stones formed by the soot and condensate will not solidify on the external and internal threads, ensuring that the plug 4 can be disassembled normally.
[0030] The embodiments described above are merely preferred embodiments of this utility model and are only used to explain this utility model. They are not intended to limit the scope of implementation of this utility model. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of this utility model should be included within the scope of the patent application of this utility model.
Claims
1. A pressure detection device for preventing blockage in industrial furnace flues, characterized in that, Includes a sampling tube (1), a pressure tapping tube (2), and a differential pressure transmitter (3). The industrial furnace flue (5) is provided with a pressure tapping inclined hole (511). One end of the sampling tube (1) is inserted into the pressure tapping inclined hole (511) and communicates with the industrial furnace flue (5). The sampling tube (1) is set at an inclination. The other end of the sampling tube (1) is located outside the industrial furnace flue (5) and is threaded with a plug (4). A ball valve (11) is provided on the sampling tube (1) and the ball valve (11) is located outside the industrial furnace flue (5). The ball valve (11) is fixedly connected to one end of the pressure tapping tube (2). A needle valve (21) is provided at the other end of the pressure tapping tube (2). The needle valve (21) is fixedly connected to the differential pressure transmitter (3). The differential pressure transmitter (3) is located above the sampling tube (1).
2. The anti-clogging pressure detection device for industrial furnace flues according to claim 1, characterized in that, An insulation layer (51) is fixedly installed on the industrial furnace flue (5). The insulation layer (51) is 15cm thick and has a pressure tapping oblique hole (511) that communicates with the industrial furnace flue (5).
3. The anti-clogging pressure detection device for industrial furnace flues according to claim 1, characterized in that, The sampling tube (1) is 20cm long and the angle between the sampling tube (1) and the industrial furnace flue (5) is greater than 30°.
4. The anti-clogging pressure detection device for industrial furnace flues according to claim 2, characterized in that, Multiple pressure tapping inclined holes (511) are provided, and the multiple pressure tapping inclined holes (511) are arranged in a row with the inclination of the multiple pressure tapping inclined holes (511) increasing sequentially. One end of the sampling tube (1) is inserted into one of the pressure tapping inclined holes (511). Multiple sealing plates (6) are rotatably arranged on the industrial furnace flue (5) and the sealing plates (6) cover the pressure tapping inclined holes (511).
5. The anti-clogging pressure detection device for industrial furnace flues according to claim 4, characterized in that, A support frame (7) is fixedly installed on the industrial furnace flue (5). A support seat (8) is rotatably installed on the support frame (7) and the support seat (8) is inclined. An arc groove is provided on the support seat (8), and the other end of the sampling tube (1) is located in the arc groove of the support seat (8).
6. The anti-clogging pressure detection device for industrial furnace flues according to claim 5, characterized in that, A rotating rod (71) is rotatably mounted on the support frame (7). A fixing sleeve (81) is fixedly mounted on the support base (8) and the fixing sleeve (81) is fixedly connected to the rotating rod (71). A first ring block (72) is fixedly mounted on the support frame (7). A plurality of first screw holes (721) are provided on the first ring block (72) and the plurality of first screw holes (721) are arranged in a ring. The end of the rotating rod (71) passes through the first ring block (72) and a second ring block (711) is provided on it. A second screw hole is provided on the second ring block (711). A bolt passes through the second screw hole and one of the first screw holes (721) in sequence.
7. The anti-clogging pressure detection device for industrial furnace flues according to claim 1, characterized in that, The other end of the sampling tube (1) is provided with an external thread, and the inner wall of the plug (4) is provided with an internal thread that matches the external thread. The plug (4) is threadedly connected to the other end of the sampling tube (1) through the external thread and the internal thread.