A pipeline pressure measuring device for thermal power plants
By designing two sets of piston boxes and a pipeline pressure measurement device with rotation detection structures in thermal power plants, corrosion and thermal stress problems in high-temperature flue gas environments are solved, and more accurate pressure measurement and equipment life are achieved.
Patent Information
- Application Number
- CN202110839387.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-07-23
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2041-07-23
AI Technical Summary
The existing thermal power plant pressure measurement devices have corrosion and thermal stress problems in high-temperature flue gas environments, resulting in measurement uncertainty and short equipment life and inability to work properly.
A pipeline pressure measuring device consisting of two sets of piston boxes and a rotation detection structure is designed to drive the gas to rotate through the roller and the blades, and the rotation speed is detected by a magnetoelectric rotor to observe the instantaneous pressure, and the pressure is managed through the pressure relief tube to reduce the The flue gas directly contacts the main components.
More accurate and fast pressure measurements are achieved, the service life of the equipment is extended, and more data information is provided for analysis.
Smart Images
Figure CN113418649B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a pipeline pressure measuring device for a thermal power plant. Background Art
[0002] A thermal power plant is a plant that uses combustibles (such as coal) as fuel to produce electricity. Its basic production process is: when the fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into thermal energy. The steam pressure drives the steam turbine to rotate, converting the thermal energy into mechanical energy, and then the steam turbine drives the generator to rotate, converting the mechanical energy into electrical energy. The prime mover is usually a steam engine or a gas turbine. In some smaller power stations, internal combustion engines may also be used. They all generate electricity by using the pressure drop in the process of high-temperature, high-pressure steam or gas passing through a turbine to become low-pressure air or condensed water.
[0003] Measurement of thermal parameters (such as pressure, temperature, etc.) in the power generation process of various thermal power plants. In thermal power plants, the measurement of parameters such as flow, material level, speed, vibration, displacement and stress, as well as some online component analysis, are also included in the scope of thermal measurement.
[0004] In all kinds of production involving thermal processes, thermal measurement is the main means of online monitoring of process status and checking equipment conditions. The information and data provided by thermal measurement in power plants are the basis for control operations, economic accounting and equipment maintenance, and are also the original data required for research and improvement of production.
[0005] However, the pressure measuring devices in thermal power plants in the prior art have very high operating temperatures, which can reach thousands of degrees, and the flue gas is filled with a variety of mixtures, which has strong uncertainty and corrosiveness, bringing great difficulties to pipeline pressure measurement. The sensing elements are corroded and accompanied by thermal stress, so that they often cannot work normally. Summary of the invention
[0006] In order to solve the above technical problems, the present invention provides a pipeline pressure measuring device for a thermal power plant. The pipeline pressure measuring device for a thermal power plant is provided with two sets of piston boxes, which is conducive to more accurate, rapid and comprehensive measurement of the pressure value in the pipeline.
[0007] The present invention is achieved through the following technical solutions.
[0008] The present invention provides a pipeline pressure measuring device for a thermal power plant, comprising an intake pipeline, a transfer box, and an exhaust pipeline which are connected in sequence; the intake pipeline and the exhaust pipeline have side openings and are connected to a first piston box, a rotatable roller is installed in the transfer box, and blades are installed on the roller so that the gas passing through the transfer box drives the roller to rotate.
[0009] The roller is installed on a rotating shaft, the rotating shaft extends out of the transfer box and a rotation detection structure is installed at the outer end.
[0010] The first piston box has a first piston, and a first sealing ring is mounted on the first piston for sealing. The rear end of the first piston box is connected to the second piston box through a U-shaped connecting pipe, and the U-shaped connecting pipe is connected to a water supply pipe.
[0011] The second piston box has a second piston that divides the inner cavity of the second piston box into a liquid cavity and a gas cavity, wherein the liquid cavity is connected to a water supply pipe, and the gas cavity has an exhaust pipe connected to the outside; a third sealing ring is provided between the second piston and the second piston box and is sleeved on the second piston.
[0012] A spring is arranged in the gas chamber.
[0013] A collar is sleeved on the connection installation position of the first piston box, a second sealing ring is fitted and embedded in the inner wall of the collar, and a retaining ring is installed in the first piston box at a position facing the second sealing ring.
[0014] A pressure relief pipe is connected inside the exhaust pipe.
[0015] A fixed plate is fixed in the pressure relief pipe, a concave plug block is embedded on the fixed plate, a sliding rod is connected and fixed to the rear end of the concave plug block, the outer end of the sliding rod extends out of the pressure relief pipe and is driven by an electric telescopic rod, an air pipe is opened on the side wall of the pressure relief pipe, and a through pipe is opened on the fixed plate at a position opposite to the concave plug block.
[0016] The rotation detection structure includes a detection rod coaxially fixed to the end of the rotating shaft, a magnet ring installed at the end of the detection rod and a coil sleeved outside the magnet ring. The coil is installed on a magnetoelectric tachometer, and the magnetoelectric tachometer is fixedly installed through a fixing plate.
[0017] The beneficial effects of the present invention are as follows: by providing two groups of piston boxes, it is beneficial to more accurately, quickly and comprehensively measure the pressure value in the pipeline; by providing a magnet ring that rotates in the coil, the rotation speed of the detection rod can be obtained, so that, on the one hand, the instantaneous pressure of the pipeline can be well observed according to the change in the rotation speed, and on the other hand, the approximate flow rate of the gas can be obtained according to the rotation speed and the cross-sectional area of the pipeline, so that more data information can be obtained, which is convenient for operators to analyze, and the main components are basically not in direct contact with the flue gas, which can greatly increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of an implementation mode of the present invention;
[0019] Figure 2 yes Figure 1 Sectional view of the middle AA plane;
[0020] Figure 3 yes Figure 1 Middle BB plane section view;
[0021] Figure 4 yes Figure 1 Schematic diagram of the top view of the middle pressure relief pipe.
[0022] In the figure: 1-intake pipe, 2-exhaust pipe, 3-transfer box, 4-first piston box, 5-second piston box, 6-U-shaped connecting pipe, 7-water pipe, 8-first piston, 9-first sealing ring, 10-ring, 11-second sealing ring, 12-blocking ring, 13-second piston, 14-third sealing ring, 15-spring, 16-exhaust pipe, 17-rotating shaft, 18-roller, 19-blade, 20-fourth sealing ring, 21-block, 2 2-sealing ring, 23-limiting ring, 24-detection rod, 25-magnet ring, 26-coil, 27-magnetoelectric tachometer, 28-fixing plate, 29-pressure relief pipe, 30-mounting plate, 31-electric telescopic rod, 32-vertical plate, 33-sliding rod, 34-fifth sealing ring, 35-fixing plate, 36-through pipe, 37-concave plug-in block, 38-sixth sealing ring, 39-trachea, 40-check valve, 41-pressure relief box, 42-smoke exhaust pipe. DETAILED DESCRIPTION
[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.
[0024] Example 1
[0025] like Figures 1 to 4 A pipeline pressure measuring device for a thermal power plant shown in the figure comprises an intake pipeline 1, a transfer box 3, and an exhaust pipeline 2 which are connected in sequence; the intake pipeline 1 and the exhaust pipeline 2 have side openings and are connected to a first piston box 4, a rotatable roller 18 is installed in the transfer box 3, and a blade 19 is installed on the roller 18 so that the gas passing through the transfer box 3 drives the roller 18 to rotate.
[0026] Example 2
[0027] Based on the embodiment 1, the roller 18 is installed on the rotating shaft 17, the rotating shaft 17 extends out of the transfer box 3 and is provided with a rotation detection structure at the outer end.
[0028] Example 3
[0029] Based on Example 1, the first piston box 4 has a first piston 8, and the first piston 8 is equipped with a first sealing ring 9 for sealing. The rear end of the first piston box 4 is connected to the second piston box 5 through a U-shaped connecting pipe 6, and the U-shaped connecting pipe 6 is connected to a water supply pipe 7.
[0030] Example 4
[0031] Based on Example 3, in addition, a second piston 13 is provided in the second piston box 5 to divide the inner cavity of the second piston box 5 into a liquid cavity and a gas cavity, wherein the liquid cavity is connected to the water supply pipe 7, and the gas cavity has an exhaust pipe 16 connected to the outside; a third sealing ring 14 is provided between the second piston 13 and the second piston box 5 and is mounted on the second piston 13.
[0032] Example 5
[0033] Based on Embodiment 4, a spring 15 is installed in the gas chamber.
[0034] Example 6
[0035] Based on Example 3, a collar 10 is sleeved on the connection installation position of the first piston box 4, a second sealing ring 11 is fitted and embedded in the inner wall of the collar 10, and a retaining ring 12 is installed in the first piston box 4 at a position opposite to the second sealing ring 11.
[0036] Example 7
[0037] Based on the first embodiment, a pressure relief pipe 29 is connected inside the exhaust pipe 2 .
[0038] Example 8
[0039] Based on Example 7, in addition, a fixed plate 35 is fixed in the pressure relief pipe 29, a concave plug block 37 is embedded on the fixed plate 35, a sliding rod 33 is connected and fixed to the rear end of the concave plug block 37, the outer end of the sliding rod 33 extends out of the pressure relief pipe 29 and is driven by the electric telescopic rod 31, an air pipe 39 is opened on the side wall of the pressure relief pipe 29, and a through pipe 36 is opened on the fixed plate 35 at a position opposite to the concave plug block 37.
[0040] Example 9
[0041] Based on Example 2, the rotation detection structure includes a detection rod 24 coaxially fixed at the end of the rotating shaft 17, a magnet ring 25 installed at the end of the detection rod 24, and a coil 26 sleeved outside the magnet ring 25. The coil 26 is installed on a magnetoelectric tachometer 27, and the magnetoelectric tachometer 27 is fixedly installed by a fixing plate 28.
[0042] Example 10
[0043] Based on the above embodiment, specifically, it includes an intake pipe 1 and an exhaust pipe 2, a transfer box 3 is fixedly connected between the intake pipe 1 and the exhaust pipe 2, the intake pipe 1 and the exhaust pipe 2 are respectively communicated with the transfer box 3, the top of the intake pipe 1 and the exhaust pipe 2 are respectively fixedly connected with two first piston boxes 4, the first piston box 4 is a cylindrical box body, the two first piston boxes 4 are respectively communicated with the intake pipe 1 and the exhaust pipe 2, the top of the intake pipe 1 and the exhaust pipe 2 are respectively fixedly connected with two second piston boxes 5, the second piston box 5 is a cylindrical box body, the two second piston boxes 5 and the two first piston boxes 4 are evenly divided into two groups, each group of the second piston box 5 and the top of the first piston box 4 are fixedly connected by a U-shaped connecting pipe 6, both ends of the U-shaped connecting pipe 6 They are respectively connected to the second piston box 5 and the first piston box 4. The top of the U-shaped connecting pipe 6 is fixedly connected to a water supply pipe 7. The water supply pipe 7 is connected to the U-shaped connecting pipe 6. A valve is fixedly installed on the water supply pipe 7. A first piston 8 is fitted and slidably connected in the first piston box 4. The first piston 8 is in the shape of a circular boss. A first sealing ring 9 is fitted and sleeved on the top of the first piston 8. A collar 10 is sleeved on the first piston box 4. The bottom ends of the two collars 10 are respectively fixedly connected to the tops of the intake pipe 1 and the exhaust pipe 2. A plurality of bolts are screwed on the outer wall of the collar 10. A second sealing ring 11 is fitted and embedded on the inner wall of the collar 10. The inner wall of the second sealing ring 11 is fitted with the inner wall of the first piston box 4. A retaining ring 12 is fixedly installed in the first piston box 4. The retaining ring 12 is arranged on the first piston 8, a second piston 13 is slidably connected in the second piston box 5, a third sealing ring 14 is fixedly sleeved on the outer wall of the second piston 13, the outer wall of the third sealing ring 14 is fitted and slidably connected with the inner wall of the second piston box 5, an exhaust pipe 16 is fixedly connected to the bottom end of one side wall of the second piston box 5, the exhaust pipe 16 is communicated with the second piston box 5, a spring 15 is arranged in the second piston box 5, the top end of the spring 15 is fixedly connected to the bottom end of the second piston 13, the bottom end of the spring 15 is fixedly connected to the bottom surface of the second piston box 5, a rotating shaft 17 is arranged in the transfer box 3, both ends of the rotating shaft 17 respectively pass through the transfer box 3 and are rotatably connected thereto, two stoppers 21 are fixedly connected at both ends of the rotating shaft 17, a roller 18 is fixedly sleeved on the rotating shaft 17, and both ends of the roller 18 are respectively connected to The two opposite inner walls of the transfer box 3 are closely attached, and a plurality of blades 19 are evenly and fixedly connected in an annular shape on the outer wall of the roller 18. Two fourth sealing rings 20 are arranged at the connection between the rotating shaft 17 and the transfer box 3. The two fourth sealing rings 20 are respectively fixedly installed on the transfer box 3. Two rotatably connected sealing rings 22 are sleeved on the rotating shaft 17. The sealing ring 22 is arranged between the stopper 21 and the outer wall of the transfer box 3. Two limiting rings 23 are respectively and symmetrically fixedly installed on the two opposite outer walls of the transfer box 3. The outer walls of the two sealing rings 22 are respectively rotatably connected with the inner walls of the two limiting rings 23. The thickness of the sealing ring 22 is the same as that of the limiting ring 23. One side of the stopper 21 is respectively attached to the same side of the sealing ring 22 and the limiting ring 23. A fixing plate 28 is fixedly installed on one side of the transfer box 3.A magnetoelectric tachometer 27 is fixedly installed on one side of the top of the fixed plate 28, and a coil 26 is fixedly installed on the output end of the magnetoelectric tachometer 27. A detection rod 24 is fixedly connected to one side of one of the stoppers 21, and one end of the detection rod 24 extends into the coil 26. A magnet ring 25 is fixedly sleeved on the end of the detection rod 24 extending into the coil 26. A pressure relief pipe 29 is fixedly connected to one side of the exhaust pipe 2, and a mounting plate 30 is fixedly installed on the top of the pressure relief pipe 29. An electric telescopic rod 31 is fixedly installed on one side of the mounting plate 30. A vertical plate 32 is fixedly installed on the output end of the electric telescopic rod 31, and a sliding rod 33 is fixedly connected to the bottom end of one side of the vertical plate 32. The other end of the sliding rod 33 extends into the pressure relief pipe 29. The pressure relief pipe 29 is a pipe closed on one side, and a sliding connection between the sliding rod 33 and the pressure relief pipe 29 is provided. The fifth sealing ring 34 is fixedly installed on the pressure relief pipe 29. A fixed disk 35 is fixedly installed in the pressure relief pipe 29. A through pipe 36 is fixedly inserted on one side of the fixed disk 35. A sliding concave plug block 37 is embedded on the other side of the through pipe 36. One end of the through pipe 36 extends into the concave groove of the concave plug block 37 and fits with it. A sixth sealing ring 38 is fixedly sleeved on the outer wall of the concave plug block 37. The outer wall of the sixth sealing ring 38 fits with the inner wall of the fixed disk 35. Multiple air pipes 39 are evenly fixedly connected to one side of the pressure relief pipe 29. A one-way valve 40 is fixedly installed in each air pipe 39. A pressure relief box 41 is fixedly connected between the other ends of the multiple air pipes 39. The pressure relief box 41 is respectively connected to the multiple air pipes 39. A smoke exhaust pipe 42 is fixedly installed on the other side of the pressure relief box 41.
[0044] Embodiment 11
[0045] Based on Embodiment 10, the transfer box 3 is fixedly connected to the intake pipe 1 and the exhaust pipe 2 respectively by welding.
[0046] Example 12
[0047] Based on the tenth embodiment, the electric telescopic rod 31 and the magnetoelectric tachometer 27 are electrically connected to the external power supply through lines respectively.
[0048] Example 13
[0049] Based on Embodiment 10, the first piston box 4 and the second piston box 5 are both made of transparent material.
[0050] Embodiment 14
[0051] Based on Example 10, the roller 18 and the blade 19 are both made of lightweight corrosion-resistant alloy material.
[0052] Main working principle: When it is needed, first place it in the work area, perform welding installation, connect the smoke exhaust pipe 42 and the exhaust pipe 2 to the purification tower respectively, connect the air intake pipe 1 to the smoke exhaust port, and after installation, you can start working.
[0053] At this time, the high-temperature flue gas at the exhaust ports in each factory area enters the air intake duct 1. Figure 1 As shown, the smoke moves from left to right. When the smoke circulates, the first group of first piston box 4 and second piston box 5 installed on the intake pipe 1 will start to work, and the smoke will enter the first piston box 4 to push the first piston 8, so that the cooling fluid in the first piston box 4 is squeezed and flows into the second piston box 5. A collar 10 and a second sealing ring 11 are provided, which can well ensure the sealing of the connection between the first piston box 4 and the intake pipe 1 and ensure the normal operation of the device. When the liquid is squeezed into the second piston box 5, the second piston 13 is lowered and squeezes the spring 15, so that the pressure in the intake pipe 1 can be observed through the second piston box 5 on the left. Similarly, the first piston box 4 and the second piston box 5 on the right will also detect the pressure in the exhaust pipe 2, so that the relatively stable pressure of the two can be obtained.
[0054] However, sometimes after the air intake pipe 1 and the exhaust pipe 2 have been used for too long, most of the damage is caused by excessive instantaneous pressure, which leads to damage to the pipes. Therefore, a rotating shaft 17 is provided in the transfer box 3, and a blade 19 that rotates with the airflow is provided, so as to drive the rotating shaft 17 to rotate. Two blocks 21 are fixedly connected to both ends of the rotating shaft 17 respectively. The fourth sealing ring 20, the block 21, the sealing ring 22 and the limit ring 23 are used in coordination to ensure the sealing of the transfer box 3. At the same time, one end of the block 21 on one side is connected to a detection rod 24, and the detection rod 24 rotates with the rotation of the rotating shaft 17, driving the magnet ring 25 fixedly installed thereon to rotate in the coil 26, so that the magnetoelectric tachometer 27 works and obtains the rotation speed of the detection rod 24. On the one hand, the instantaneous pressure of the pipeline can be well observed according to the change of the rotation speed, and on the other hand, the approximate flow rate of the gas can be obtained according to the rotation speed and the cross-sectional area of the pipeline, so that more data information can be obtained, which is convenient for the operator to analyze.
[0055] When the pressure in the pipeline is too high, the device is provided with a pressure relief pipe 29. When the pressure is too high, the electric telescopic rod 31 is directly started, so that the vertical plate 32 drives the sliding rod 33 to move, so that the concave plug block 37 is pulled out in the fixed plate 35, so that the through pipe 36 is unobstructed for exhaust. At this time, a plurality of air pipes 39 with smaller diameters are arranged on one side of the air inlet pipe of the pressure relief pipe 29, so that the gas can enter the pressure relief box 41 along the plurality of air pipes 39, and then be discharged into the purification tower along the spare pipeline smoke exhaust pipe 42, thereby effectively solving the problem of pipeline damage caused by pressure.
Claims
1. A pipeline pressure measuring device for a thermal power plant, comprising an air intake pipeline (1), a transfer box (3), and an exhaust pipeline (2) which are connected in sequence. Features: The air inlet pipe (1) and the air outlet pipe (2) have side openings and are connected to a first piston box (4). A rotatable roller (18) is installed in the transfer box (3). The roller (18) is provided with blades (19) so that the gas passing through the transfer box (3) drives the roller (18) to rotate. The roller (18) is mounted on a rotating shaft (17), the rotating shaft (17) extends out of the transfer box (3) and is provided with a rotation detection structure at the outer end; The first piston box (4) has a first piston (8), and a first sealing ring (9) is mounted on the first piston (8) for sealing. The rear end of the first piston box (4) is connected to the second piston box (5) via a U-shaped connecting pipe (6), and the U-shaped connecting pipe (6) is connected to a water supply pipe (7); The second piston box (5) has a second piston (13) which divides the inner cavity of the second piston box (5) into a liquid cavity and a gas cavity, wherein the liquid cavity is connected to a water supply pipe (7), and the gas cavity has an exhaust pipe (16) connected to the outside; a third sealing ring (14) is provided between the second piston (13) and the second piston box (5) and is sleeved on the second piston (13); A spring (15) is installed in the gas chamber; The rotation detection structure comprises a detection rod (24) coaxially fixed to the end of the rotating shaft (17), a magnet ring (25) mounted on the end of the detection rod (24), and a coil (26) sleeved outside the magnet ring (25); the coil (26) is mounted on a magnetoelectric tachometer (27), and the magnetoelectric tachometer (27) is fixedly mounted via a fixing plate (28).
2. The pipeline pressure measuring device for a thermal power plant according to claim 1, Features: A collar (10) is sleeved on the connection installation position of the first piston box (4), a second sealing ring (11) is fitted and embedded in the inner wall of the collar (10), and a retaining ring (12) is installed in the first piston box (4) at a position facing the second sealing ring (11).
3. The pipeline pressure measuring device for a thermal power plant according to claim 1, Features: The exhaust pipe (2) is internally connected to a pressure relief pipe (29).
4. The pipeline pressure measuring device for a thermal power plant according to claim 3, Features: A fixed plate (35) is fixed in the pressure relief pipe (29), a concave plug block (37) is embedded in the fixed plate (35), a sliding rod (33) is connected and fixed to the rear end of the concave plug block (37), the outer end of the sliding rod (33) extends out of the pressure relief pipe (29) and is driven by the electric telescopic rod (31), an air pipe (39) is opened on the side wall of the pressure relief pipe (29), and a through pipe (36) is opened on the fixed plate (35) at a position directly opposite to the concave plug block (37).