Filtering device capable of changing flow direction of low-temperature flue gas

Abstract

The utility model discloses a low-temperature flue gas flow direction-changing filtering device, which relates to the technical field of flue gas treatment and comprises a flange plate, a filtering component, an inflow pipe, a return pipe, an outflow pipe, a temperature detector, a spherical valve, a mobile power supply, a flexible lead and a protection component. When the detected temperature is higher than a threshold value, the execution motor drives the valve ball to rotate by 90 degrees to be switched to the backflow pipeline to achieve circulation treatment, and after the temperature reaches the standard, reverse reset is conducted, and the outflow pipe is communicated for discharging; the temperature measuring probe is arranged at the downstream of the filtering assembly, so that flue gas is subjected to contact detection after multi-stage filtering dust removal, particulate matter interference is effectively eliminated, and the temperature detection precision is improved; the mobile power source, the temperature detector body and the execution motor are connected through the flexible wires to form a closed-loop circuit, autonomous power supply of equipment is achieved, and external wiring constraint is avoided. The device is high in measurement accuracy, good in working condition adaptability and high in overall practicability.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically to a low-temperature flue gas flow direction changing filtration device. Background Technology

[0002] In industrial production processes such as metallurgy, chemical engineering, and power generation, the generation of high-temperature flue gas is unavoidable. Its temperature typically exceeds 500℃, and it contains components such as dust and corrosive gases. To meet the requirements of subsequent environmental protection processes such as dust removal and desulfurization, the flue gas temperature must be rapidly cooled to below 150℃.

[0003] High-temperature flue gas exchanges heat with other working media through a heat exchanger, cooling down to become low-temperature flue gas. For some small thermal equipment, the cooling effect of the designed heat exchanger is greatly affected by the specific operating conditions. Often, there is insufficient contact area between the flue gas and the cooling medium or poor turbulence, resulting in the flue gas temperature remaining high even after cooling by the heat exchanger. If the cooling effect is substandard, it can not only lead to problems such as high-temperature corrosion of equipment and damage to filter media, but also affect the pollutant removal efficiency due to excessively high flue gas temperature, and even cause safety accidents.

[0004] With increasingly stringent environmental standards, some related industries require that the temperature of flue gas after cooling should not exceed a preset value. However, existing technologies may be unable to meet these requirements due to structural design limitations. Therefore, there is an urgent need to develop a device that can adapt to various flue gas conditions and ensure that the temperature of the flue gas after cooling meets the standards, so as to meet the requirements of subsequent treatment processes. Utility Model Content

[0005] To address the problem of substandard flue gas temperature after cooling in some existing small flue gas heat exchangers, this invention provides a low-temperature flue gas flow direction reversing filtration device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-temperature flue gas flow reversing filtration device includes a flange, a filter assembly, an inflow pipe, a return pipe, an outflow pipe, a temperature detector, a ball valve, a power supply, a flexible wire, and a protection component. The flange is welded to the ends of the inflow pipe, the return pipe, and the outflow pipe away from the ball valve. The filter assembly contains a device base, an axial filter screen, a columnar sheet, a radial filter screen, and a circular sheet. The temperature detector contains a temperature probe, a sealing fastener, and a temperature detector body. The ball valve includes a valve ball, a valve shaft connector, a ball valve housing, an actuator motor, and a rotating shaft. The valve ball has two ports.

[0008] Preferably, the axial filter screen, columnar sheet, radial filter screen, and circular sheet of the filter assembly are fixed together by welding. The device base is placed on the outside of the air inlet end of the inflow pipe, and the remaining components are located inside the inflow pipe. The dust inside the filter assembly can be cleaned by disassembling the device base. The circular sheet and columnar sheet block the straight-flowing flue gas, forcing it to change its flow path and flow perpendicularly through the axial filter screen and radial filter screen, respectively, thereby intercepting, settling, and purifying solid particulate impurities in the flue gas.

[0009] Preferably, the temperature probe is located at the rear of the filter assembly, on the center line of the inflow pipe, passing through the space between the inlet pipe wall and the ball valve housing, and finally connected to the temperature detector body. After passing through the filter assembly, the solid impurities in the flue gas are drastically reduced, and the temperature probe will not be covered by a large amount of fly ash but will directly contact the flue gas to measure and transmit the measured flue gas temperature value to the temperature detector body.

[0010] Preferably, the sealing fastener includes a high-temperature corrosion resistant gasket and a fastener. The two sealing fasteners are located on the inner wall of the inflow pipe and the interlayer close to the pipe wall, respectively, to fix the temperature probe and prevent flue gas from directly invading the area where the temperature detector body is located through the gap between the temperature probe and the inflow pipe wall.

[0011] Preferably, the temperature detector body, the power supply, and the actuator motor are connected by flexible wires to form a closed loop; the protection component encloses the complete circuit including the temperature detector body, the power supply, and the actuator motor, and is easy to disassemble and install; the power supply is detachable and replaceable.

[0012] Preferably, the actuator motor is mechanically connected to the rotating shaft, and the shaft valve connector connects and secures the rotating shaft to the valve ball through a fixing nut. When the rotating shaft rotates, it will drive the valve ball to rotate synchronously around the shaft.

[0013] The two ports of the valve ball are initially connected to the inlet pipe and the outlet pipe, respectively. When the detected temperature is higher than the preset cooling temperature, the valve ball rotates 90 degrees counterclockwise around the axis, that is, the flue gas flows in from the inlet pipe and is discharged from the return pipe, flowing back to the middle of the flue gas heat exchanger for secondary cooling. After the temperature reaches the target, the valve ball rotates 90 degrees clockwise with the rotating shaft, that is, the flue gas flows in from the inlet pipe and is discharged from the outlet pipe.

[0014] Beneficial effects:

[0015] In this invention, a flange, filter assembly, inflow pipe, return pipe, outflow pipe, temperature detector, ball valve, power supply, flexible wire, and protection components are used. Because the filter assembly redirects the incoming flue gas, the temperature probe is not covered by fly ash particles in the flue gas and directly contacts the flue gas, transmitting the instantaneous average temperature value of the probe's detection line to the temperature detector body. The temperature detector body, power supply, and actuator motor are connected in a closed loop via the flexible wire. When the flue gas temperature is higher than the preset cooling temperature, the actuator motor and rotating shaft in the closed loop rotate 90 degrees counterclockwise, causing the valve ball connected to the rotating shaft stud to rotate 90 degrees synchronously around the shaft. Flue gas flows in through the inflow pipe and out through the return pipe, returning to the middle of the flue gas heat exchanger for secondary cooling. When the flue gas temperature is less than or equal to the preset cooling temperature, the valve ball rotates 90 degrees clockwise with the rotating shaft, meaning the flue gas flows in through the inflow pipe and out through the outflow pipe for subsequent processing. The overall structure of this utility model is relatively simple and the manufacturing cost is low, but it can ensure that the flue gas treatment temperature of small thermal equipment meets the standard, making it highly practical. Attached Figure Description

[0016] Figure 1 This is an isometric view of a low-temperature flue gas flow direction changing filtration device according to the present invention;

[0017] Figure 2 This is a cross-sectional view of a low-temperature flue gas flow direction changing filtration device according to the present invention;

[0018] Figure 3 This is a half-sectional view of the filter assembly of this utility model;

[0019] Figure 4 This is a flowchart illustrating the working process of a low-temperature flue gas flow direction reversing filtration device according to the present invention.

[0020] In the figure, the reference numerals are as follows: 1. Flange; 2. Filter assembly; 21. Device base; 22. Axial filter screen; 23. Columnar sheet; 24. Radial filter screen; 25. Circular sheet; 3. Inflow pipe; 4. Return pipe; 5. Outflow pipe; 6. Temperature detector; 61. Temperature probe; 62. Sealing fastener; 63. Temperature detector body; 7. Ball valve; 71. Valve ball; 711. Port 1; 712. Port 2; 72. Shaft valve connector; 73. Ball valve housing; 74. Actuator motor; 75. Rotating shaft; 8. Mobile power supply; 9. Flexible wire; 10. Protection component. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] like Figure 1 , Figure 2 As shown, this embodiment provides a low-temperature flue gas flow direction reversing filtration device, including a flange 1, a filter assembly 2, an inflow pipe 3, a return pipe 4, an outflow pipe 5, a temperature detector 6, a ball valve 7, a mobile power supply 8, a flexible wire 9, and a protection assembly 10. One end of the inflow pipe 3, the return pipe 4, and the outflow pipe 5 are respectively fixedly connected to the ball valve 7, and the other end of the inflow pipe 3, the return pipe 4, and the outflow pipe 5 are all fixedly connected to the flange 1. The return pipe 4 and the outflow pipe 5 are on the same straight line, and the inflow pipe 3 is perpendicular to the return pipe 4 and the outflow pipe 5. The filter assembly 2 is fixedly installed inside the inflow pipe 3. Each component of the temperature detector 6 is fixedly placed inside the inflow pipe 3, the ball valve 7, and the protection assembly 10. The mobile power supply 8 and the flexible wire 9 are wrapped within the protection assembly 10.

[0023] like Figure 2 , Figure 3 As shown, the filter assembly 2 consists of a device base 21, an axial filter screen 22, a columnar sheet 23, a radial filter screen 24, and a circular sheet 25. The axial filter screen 22 and the radial filter screen 24 are welded and fixed to the side of the circular sheet 25, and the columnar sheet 23 is welded and fixed to the outer ring edge of the radial filter screen 24. The device base 21 is fixed to the axial filter screen 22 and the columnar sheet 23 by a detachable snap fastener, and one side of it is fixedly placed close to the inlet end of the inflow pipe 3. The circular sheet 25 and the columnar sheet 23 form a closed structure, which forces the flue gas to penetrate vertically through the axial filter screen 22 and the radial filter screen 24 to achieve graded filtration of impurities.

[0024] The temperature detector 6 includes a temperature probe 61, a sealing fastener 62, and a temperature detector body 63. The temperature probe 61 is located at the rear of the filter assembly 2 and on the center line of the inflow pipe 3, and its end is connected to the temperature detector body 63. The sealing fastener 62 uses stainless steel bolts and ceramic gaskets to seal and fix the temperature probe 61 to the inner wall of the inflow pipe 3 and prevent flue gas from leaking into the area where the temperature detector body 63 is located.

[0025] The ball valve 7 contains a ball 71, a shaft valve connector 72, a ball valve housing 73, an actuator motor 74, and a rotating shaft 75. The ball 71 and the rotating shaft 75 are connected via the shaft valve connector 72. The ball 71 has a first port 711 and a second port 712. Both ports are circular, with a 90-degree angle between their center lines. In the initial state, they are connected to the inflow pipe 3 and the outflow pipe 5, respectively, and rotate synchronously with the ball 71 around the shaft. The rotating shaft 75 is mechanically connected to the actuator motor 74 and the ball 71, retaining only one degree of freedom around the Z-axis. The ball valve housing 73 is fixed to one end of the inflow pipe 3, the return pipe 4, and the outflow pipe 5, respectively. The actuator motor 74 is located directly above the ball valve housing 73 and enclosed inside the protective component 10. The first port 711 is the port between the ball valve 7 and the inflow pipe 3, and the second port 712 is the port between the ball valve 7 and the return pipe 4.

[0026] The flexible wire 9 connects the temperature detector body 63, the actuator motor 74, and the mobile power supply 8 into a closed loop; wherein, the interface end of the temperature detector body 63 is connected to the end of the temperature probe 61.

[0027] The temperature detector body 63, the actuator 74, and the mobile power supply 8 are connected into a closed loop via a flexible wire 9. When the temperature of the filtered flue gas is >150℃, the actuator 74 drives the rotating shaft 75 to rotate 90 degrees counterclockwise, and drives the valve ball 71 to rotate synchronously through the shaft valve connector 72. The port of the valve ball 71 is connected to the inflow pipe 3 and the return pipe 4 respectively. The flue gas that does not meet the standard returns to the middle of the heat exchanger for secondary cooling. When the temperature of the filtered flue gas is ≤150℃, the actuator 74 drives the rotating shaft 75 to rotate 90 degrees clockwise again, and drives the valve ball 71 to rotate synchronously through the shaft valve connector 72. The port of the valve ball 71 is connected to the inflow pipe 3 and the outflow pipe 5 respectively. The qualified flue gas is discharged from the outflow pipe and enters the next processing system.

[0028] like Figure 4 As shown, the working process of this utility model is as follows:

[0029] Filtration stage: The low-temperature flue gas, cooled by the flue gas heat exchanger, flows into the inlet pipe 3 and is filtered by the axial filter screen 22 and the radial filter screen 24. A large number of solid particles in the flue gas are slowed down and settled inside the filter assembly 2.

[0030] Temperature detection and flow direction switching: Temperature probe 61 detects the flue gas temperature in real time. When the flue gas temperature is >150℃, the actuator 64 rotates 90 degrees counterclockwise around its shaft, the return pipe 4 opens, and the flue gas is introduced into the middle of the heat exchanger for secondary cooling through the pipeline. When the flue gas temperature is ≤150℃, the actuator 64 drives the rotating shaft 65 and the valve ball to rotate 90 degrees clockwise to complete the reset, the outflow pipe 5 opens, and the qualified flue gas is introduced into the subsequent treatment device through the pipeline.

[0031] Power supply replacement: When the power of the original power bank 8 is insufficient, it can be removed and replaced with a new power bank to ensure that the low temperature flow device continues to operate stably and that the temperature of the exhaust gas meets the required requirements.

[0032] This device uses multi-stage filtration and a closed loop including a power supply, temperature detector, and actuator to keep the outlet flue gas temperature stable below 150℃, solving the problem of insufficient cooling in small heat exchangers. The filter screen 2 is removable for cleaning, and the power supply 8 is removable for replacement, ensuring long-term stability of the equipment.

[0033] Preferably, the sealing fastener includes a high-temperature resistant gasket and a fastening bolt, used to fix the temperature probe to the inner wall of the inflow pipe and prevent flue gas from leaking into the area where the temperature detector body is located.

[0034] Preferably, the valve ball has high strength and a thinner ball wall.

[0035] Preferably, the protection component encloses the entire closed loop, including the temperature detector body, the actuator motor, the mobile power supply, etc., and isolates it from the outside world.

[0036] Preferably, the temperature probe is located at the rear of the filter assembly and on the center line of the inflow pipe, transmitting the instantaneous average temperature of the entire detection line as the measured flue gas temperature value to the rear component.

[0037] The above embodiments are only typical implementations of this utility model. Those skilled in the art can adjust the preset temperature value, filter mesh size and valve switching angle according to the actual working conditions. All such modifications fall within the protection scope of this utility model.

Claims

1. A low-temperature flue gas flow direction changing filtration device, characterized in that, The system includes a flange (1), a filter assembly (2), an inlet pipe (3), a return pipe (4), an outlet pipe (5), a temperature detector (6), a ball valve (7), a power supply (8), a flexible wire (9), and a protection assembly (10). The inlet pipe (3) is connected to the outlet of the flue gas heat exchanger via a welded flange (1), and the return pipe (4) and outlet pipe (5) are respectively connected to the middle of the flue gas heat exchanger and subsequent processing equipment via welded flanges (1). The filter assembly (2) is located inside the inlet pipe (3) and includes a device base (21), an axial filter screen (22), a columnar sheet (23), a radial filter screen (24), and a circular sheet (25). The circular sheet (25) and the columnar sheet (23) work together to force the flue gas to change its flow direction and pass through the axial filter screen (22) in sequence. The radial filter (24) is used for filtration; the temperature detector (6) includes a temperature probe (61), a sealing fastener (62), and a temperature detector body (63); the temperature probe (61) is located on the center line of the inflow pipe (3) and behind the filter assembly (2); the ball valve (7) is provided with a valve ball (71), a shaft valve connector (72), a ball valve shell (73), an actuator motor (74), and a rotating shaft (75); the valve ball (71) and the rotating shaft (75) are connected by the shaft valve connector (72), and the valve ball (71) is provided with a port one (711) and a port two (712); the port rotates synchronously with the valve ball (71) around the shaft; the rotating shaft (75) is mechanically connected by the actuator motor (74) and the valve ball (71), and only retains one degree of freedom around the Z axis; the flexible wire (9) connects the temperature detector body (63), the actuator motor (74), and the mobile power supply (8) into a closed loop.

2. The cryogenic smoke flow direction changing filter device according to claim 1, characterized in that, The device base (21) of the filter assembly (2) is attached to the inner wall of the inflow pipe (3). The circular sheet (25) and the columnar sheet (23) form a closed structure, which forces the flue gas to pass vertically through the axial filter screen (22) and the radial filter screen (24) to achieve multi-stage filtration and impurity sedimentation.

3. The cryogenic smoke flow direction changing filter device of claim 1, wherein, The sealing fastener (62) includes a high-temperature resistant gasket and a fastening bolt, used to fix the temperature probe (61) to the inner wall of the inflow pipe (3) and prevent flue gas from leaking into the area where the temperature detector body (63) is located.

4. The low-temperature flue gas flow direction changing filtration device according to claim 1, characterized in that, The valve ball (71) has high strength and a thin wall.

5. The cryogenic smoke flow direction changing filter device of claim 1, wherein, The flange (1) is welded to the end of the inflow pipe (3), return pipe (4), and outflow pipe (5) away from the ball valve housing (73).

6. The cryogenic smoke flow direction changing filter device of claim 1, wherein, The protection component (10) completely encloses the closed loop, including the temperature detector body (63), the actuator motor (74), and the mobile power supply (8), and isolates it from the outside world.

7. The cryogenic smoke flow direction changing filter device of claim 1, wherein, The temperature probe (61) is located at the rear of the filter assembly (2) and on the center line of the inflow pipe (3), transmitting the instantaneous average temperature of the entire detection line as the measured flue gas temperature value to the rear component.

8. The cryogenic smoke flow direction changing filter device of claim 1, wherein, The temperature detector body (63), the mobile power supply (8), and the actuator (74) are connected by a flexible wire (9) to form a closed loop; the mobile power supply (8) is detachable and replaceable.

9. The low-temperature flue gas flow direction changing filtration device according to claim 1, characterized in that, When the detected temperature is higher than the preset cooling temperature, the actuator (74) drives the rotating shaft (75) to rotate 90 degrees counterclockwise, and the inlet of the valve ball (71) is connected to the inlet pipe (3) and the return pipe (4) respectively. The flue gas that does not meet the standard returns to the middle of the heat exchanger for secondary cooling. When the detected temperature is less than or equal to the preset cooling temperature, the actuator (74) drives the rotating shaft (75) to rotate 90 degrees clockwise, and the inlet of the valve ball (71) is connected to the inlet pipe (3) and the outlet pipe (5) respectively. The qualified flue gas is discharged from the outlet pipe (5) and enters the next processing system.

10. The cryogenic smoke flow direction changing filter device of claim 1, wherein, The device base (21) of the filter assembly (2) is detachable, which facilitates cleaning the dust inside the filter assembly; the mobile power supply (8) is detachable and replaceable to ensure the continuous and stable operation of the low-temperature flue gas flow direction changing filter device.

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