A high-temperature flue gas purification and reuse system for industrial coal-fired boilers

Abstract

The present invention discloses a high-temperature flue gas purification and reuse system for industrial coal-fired boilers, comprising a heat utilization water tank, an air pipe arranged in the heat utilization water tank, the air pipe is arranged in a bent structure, the lower end of the air pipe penetrates the heat utilization water tank and is connected with a flue pipe, the upper end of the air pipe penetrates the heat utilization water tank, the heat utilization water tank is connected with an inlet pipe and an outlet pipe; the inner wall of the flue pipe is fixedly connected with a filter screen, the inner wall of the flue pipe and the right side of the filter screen are fixedly connected with a fixed frame, and the inner wall of the fixed frame is rotatably installed with an impeller. The present invention utilizes the kinetic energy of high-temperature flue gas to convert into mechanical energy, and then accumulates air in the air storage cavity. After the wind receiving plate senses that the blockage degree of the filter screen reaches a certain degree, it automatically sprays high-pressure airflow to the space between the first solenoid valve and the filter screen, so that the cleaning brush removes dust, automatically and intermittently cleans, and avoids the formation of a poor heat conduction layer on the inner wall of the air pipe.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a high-temperature flue gas purification and recycling system for an industrial coal-fired boiler. Background Art

[0002] A coal-fired boiler is a thermal power device that uses coal as fuel. The coal burns in the furnace to release heat, heating the heat medium water or other organic heat carrier (such as thermal oil) to a certain temperature or pressure. In industry, it can be used to supply boiling water, heating and bathing, gas supply, steaming and drying, etc.

[0003] In the process of using coal-fired boilers, high-temperature flue gas will be generated. In order to increase the efficiency of energy utilization, heat can be transferred to water through the air pipe to recycle the heat in the high-temperature flue gas. However, due to the presence of dust in the high-temperature flue gas, if the dust is not processed, it will adhere to the inner wall of the air pipe to form a medium layer, thereby reducing the heat conduction efficiency. Therefore, a filter is needed to intercept the dust. However, during long-term use, the filter needs to be cleaned periodically by humans. If the cleaning is not timely, the ventilation volume will be affected.

[0004] To this end, we propose an industrial coal-fired boiler high-temperature flue gas purification and reuse system to solve the above problems. Summary of the invention

[0005] The present invention is intended to provide a high-temperature flue gas purification and recycling system for an industrial coal-fired boiler to solve the problems raised in the background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-temperature flue gas purification and reuse system for an industrial coal-fired boiler comprises a heat utilization water tank, an air pipe is arranged in the heat utilization water tank, the air pipe is arranged in a bent structure, the lower end of the air pipe passes through the heat utilization water tank and is connected to the flue pipe, the upper end of the air pipe passes through the heat utilization water tank, and the heat utilization water tank is connected to a water inlet pipe and a water outlet pipe at the top and bottom; a filter is fixedly connected to the inner wall of the flue pipe, a fixing frame is fixedly connected to the inner wall of the flue pipe and on the right side of the filter, an impeller is rotatably installed on the inner wall of the fixing frame, a central shaft is coaxially fixedly inserted in the impeller, a fixing block is embedded at the upper end of the flue pipe and on the right side of the fixing frame, an air storage chamber and a transfer chamber are opened up and down in the fixing block, and the lower end of the transfer chamber is open, a first piston is airtightly slidably connected to the transfer chamber, and the first piston is connected to the central shaft A pneumatic component is connected between the two, the inner wall of the transfer chamber is provided with a one-way air inlet hole connected to the outside world and a one-way air outlet hole connected to the air storage chamber, the inner wall of the air storage chamber is connected with a high-pressure jet pipe, and the end of the high-pressure jet pipe away from the fixed block is connected to the flue gas pipe and is on the left side of the filter screen, and a second solenoid valve is installed at the end of the high-pressure jet pipe close to the fixed block, a passive shaft is rotatably connected with a bearing in the filter screen, a plurality of cleaning brushes are evenly and fixedly connected to the passive shaft in an annular manner, an induction component is connected between the passive shaft and the central axis, a first solenoid valve is fixedly installed on the inner wall of the flue gas pipe and on the left side of the filter screen, a dust outlet is provided at the lower end of the flue gas pipe between the first solenoid valve and the filter screen, a third solenoid valve is installed in the dust outlet, and a compression component is connected to the upper end of the flue gas pipe and on the left side of the first solenoid valve.

[0008] Preferably, the pneumatic assembly comprises a crank fixedly connected to the central axis, one end of the crank away from the central axis is hinged to a connecting rod, and one end of the connecting rod away from the crank is hinged to the first piston.

[0009] Preferably, the one-way air inlet, the one-way air outlet, and one end of the high-pressure jet pipe close to the smoke pipe are all equipped with a one-way valve.

[0010] Preferably, the sensing component includes a contact sensor fixedly installed on the right end of the passive shaft, a rod groove is opened at the left end of the central shaft, a first spring is fixedly connected to the inner wall of the rod groove, the other end of the first spring is fixedly connected to a sliding rod, and the sliding rod is slidably connected to the rod groove, and the left end of the sliding rod is fixedly connected to a wind receiving plate.

[0011] Preferably, a collection box is fixedly connected to the lower end of the smoke pipe at a corresponding position of the dust outlet.

[0012] Preferably, the contact sensor signal is connected to a controller, and the controller is electrically connected to the first solenoid valve, the second solenoid valve, and the third solenoid valve.

[0013] Preferably, the compression assembly comprises an air pressure box which is connected to the smoke pipe and has an open lower end, and a second piston is air-tightly slidably connected inside the air pressure box.

[0014] Preferably, a wind bowl is provided on the side of each cleaning brush.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention utilizes the kinetic energy of high-temperature flue gas to convert into mechanical energy, and then accumulates air in the air storage chamber. After the wind receiving plate senses that the blockage degree of the filter screen has reached a certain level, it automatically sprays high-pressure airflow into the space between the first solenoid valve and the filter screen, so that the cleaning brush removes dust, automatically and intermittently cleans, and avoids the formation of a poor heat conductive layer on the inner wall of the trachea. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural cross-sectional view of a high-temperature flue gas purification and recycling system for an industrial coal-fired boiler proposed by the present invention;

[0018] Figure 2 for Figure 1 The structural cross-section view from the front of the middle flue gas pipe;

[0019] Figure 3 for Figure 2 The enlarged structural diagram of the fixed block in the middle;

[0020] Figure 4 for Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0021] In the figure: 1 heat utilization water tank, 2 air pipe, 3 water inlet pipe, 4 water outlet pipe, 5 flue gas pipe, 6 filter screen, 7 first electromagnetic valve, 8 fixed frame, 9 impeller, 10 central axis, 11 crank, 12 fixed block, 13 transfer chamber, 14 air storage chamber, 15 first piston, 16 connecting rod, 17 one-way air inlet hole, 18 one-way air outlet hole, 19 high-pressure jet pipe, 20 second electromagnetic valve, 21 cleaning brush, 22 contact sensor, 23 rod groove, 24 sliding rod, 25 first spring, 26 wind receiving plate, 27 third electromagnetic valve, 28 collection box, 29 air pressure box, 30 second piston, 31 second spring, 32 passive shaft. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figure 1-4A high-temperature flue gas purification and reuse system for an industrial coal-fired boiler includes a heat utilization water tank 1. An air pipe 2 is arranged in the heat utilization water tank 1. The air pipe 2 is arranged in a bent structure. The lower end of the air pipe 2 passes through the heat utilization water tank 1 and is connected to a flue gas pipe 5. The upper end of the air pipe 2 passes through the heat utilization water tank 1. The heat utilization water tank 1 is connected to an inlet pipe 3 and an outlet pipe 4 at the top and bottom. The hot water pipe 4 is equipped with a switch valve.

[0024] In the present invention, the high-temperature flue gas generated by the coal-fired boiler flows through the air pipe 2 after being filtered. During the flow in the air pipe 2, the heat can be transferred to the water. Hot water can be used by opening the switch valve on the water outlet pipe 4. The low-temperature water flows into the heat utilization water tank 1 through the water inlet pipe 3. The air temperature flowing through the air pipe 2 from bottom to top gradually decreases, and the water temperature of the heat utilization water tank 1 from bottom to top also corresponds to it, and the water temperature gradually decreases.

[0025] The inner wall of the smoke pipe 5 is fixedly connected with a filter screen 6, and the inner wall of the smoke pipe 5 and the right side of the filter screen 6 are fixedly connected with a fixing frame 8, and the inner wall of the fixing frame 8 is rotatably installed with an impeller 9, and the impeller 9 has blades, and the high-temperature airflow can drive the impeller 9 to rotate through the blades. A central axis 10 is coaxially fixedly inserted in the impeller 9, and a fixing block 12 is embedded in the upper end of the smoke pipe 5 and the right side of the fixing frame 8. The fixing block 12 is provided with an air storage chamber 14 and a transfer chamber 13 in the upper and lower parts, and the transfer chamber 1 3 is open, a first piston 15 is airtightly and slidably connected in the transfer chamber 13, a pneumatic assembly is connected between the first piston 15 and the central shaft 10, specifically, the pneumatic assembly includes a crank 11 fixedly connected to the central shaft 10, an end of the crank 11 away from the central shaft 10 is hinged to a connecting rod 16, an end of the connecting rod 16 away from the crank 11 is hinged to the first piston 15, and the crank 11 drives the first piston 15 to perform a reciprocating lifting action in the transfer chamber 13 through the connecting rod 16.

[0026] The inner wall of the transfer chamber 13 is provided with a one-way air inlet 17 connected to the outside world and a one-way air outlet 18 connected to the air storage chamber 14. The inner wall of the air storage chamber 14 is connected with a high-pressure jet pipe 19, and the end of the high-pressure jet pipe 19 away from the fixed block 12 is connected to the flue gas pipe 5 and is located on the left side of the filter screen 6. The one-way air inlet 17, the one-way air outlet 18, and the end of the high-pressure jet pipe 19 close to the flue gas pipe 5 are all installed with a one-way valve, and the one-way valve is provided to limit the movement direction of the airflow.

[0027] A second solenoid valve 20 is installed at one end of the high-pressure jet pipe 19 close to the fixed block 12. A passive shaft 32 is rotatably connected to the filter screen 6 using a bearing. A plurality of cleaning brushes 21 are evenly and fixedly connected to the passive shaft 32 in a ring shape. The cleaning brush 21 has bristles, but they are not shown in the figure. A wind bowl is provided on the side of each cleaning brush 21 to increase the wind receiving area of ​​the cleaning brush 21 so as to drive the cleaning brush 21 to rotate under the power of the airflow.

[0028] A sensing component is connected between the passive shaft 32 and the central shaft 10. Specifically, the sensing component includes a contact sensor 22 fixedly installed on the right end of the passive shaft 32. The contact switch 22 is a prior art. A rod groove 23 is opened at the left end of the central shaft 10. A first spring 25 is fixedly connected to the inner wall of the rod groove 23. A sliding rod 24 is fixedly connected to the other end of the first spring 25, and the sliding rod 24 is slidably connected to the rod groove 23. A wind receiving plate 26 is fixedly connected to the left end of the sliding rod 24. The sliding rod 24 is driven by the wind receiving plate 26 to compress the first spring 25. When there is no high-temperature airflow transmission or the filter 6 is blocked to a certain extent, the wind receiving plate 26 contacts the contact sensor 22 under the elastic force of the first spring 25.

[0029] A first solenoid valve 7 is fixedly installed on the inner wall of the smoke pipe 5 and on the left side of the filter screen 6. A dust outlet is opened at the lower end of the smoke pipe 5 between the first solenoid valve 7 and the filter screen 6. A collection box 28 is fixedly connected to the lower end of the smoke pipe 5 and at the corresponding position of the dust outlet. Dust can enter the collection box 28 through the dust outlet.

[0030] A third solenoid valve 27 is installed in the dust outlet, and a compression assembly is connected to the upper end of the smoke pipe 5 and on the left side of the first solenoid valve 7. Specifically, the compression assembly includes an air pressure box 29 which is connected to the smoke pipe 5 and has an open lower end. A second piston 30 is airtightly and slidably connected in the air pressure box 29. During the process of cleaning the filter 6, the high-temperature smoke lifts the second piston 30 in the air pressure box 29 to increase the volume on the left side of the smoke pipe 5.

[0031] The contact sensor 22 signal is connected to a controller, which is a prior art, and can receive the signal sent by the contact sensor 22, and control the following solenoid valves to be energized, and the controller is electrically connected to the first solenoid valve 7, the second solenoid valve 20, and the third solenoid valve 27. It should be noted that the first solenoid valve 7 is a normally open solenoid valve, and the second solenoid valve 20 and the third solenoid valve 27 are normally closed solenoid valves.

[0032] When the present invention is used under normal conditions, the filter 6 is less blocked, the first solenoid valve 7 is in an open state, and the second solenoid valve 20 and the third solenoid valve 27 are in a closed state. After the high-temperature flue gas passes through the first solenoid valve 7, dust is intercepted by the filter 6, and the dust-free high-temperature airflow passes through the filter 6. The high-temperature airflow has a certain kinetic energy, and then pushes the wind receiving plate 26, which compresses the first spring 25. There is a gap between the wind receiving plate 26 and the contact sensor 22. The wind receiving plate 26 then drives the impeller 9 and the central shaft 10 connected thereto to rotate, and the central shaft 10 drives the crank 11 to rotate. The crank 11 drives the first piston 15 to slide up and down reciprocatingly in the transfer chamber 13 through the connecting rod 16. The internal volume of the transfer chamber 13 above the first piston 15 changes, and then the outside air is sucked into the transfer chamber 13 through the one-way air inlet 17, and the air in the transfer chamber 13 is pressed into the air storage chamber 14 through the one-way air outlet 18. It should be noted that a small amount of air is pressed into the air storage chamber 14 each time, and the volume of the air storage chamber 14 is relatively large, and will not explode due to the continuous increase in air pressure. For safety reasons, a pressure relief valve connected to the air storage chamber 14 can be installed to automatically relieve pressure for protection when a predetermined pressure is reached.

[0033] After using the present invention for a certain period of time, when the blockage degree of the filter 6 reaches the cleaning standard, the high-temperature airflow cannot overcome the elastic force of the first spring 25 and push the wind receiving plate 26, and the wind receiving plate 26 contacts the contact sensor 22, and the controller can control the first electromagnetic valve 7 to close, the second electromagnetic valve 20 and the third electromagnetic valve 27 to open, and then delay to restore its state, so that the high-pressure air in the air storage chamber 14 is sprayed to the cleaning brush 21 through the high-pressure jet pipe 19 and drives the cleaning brush 21 to rotate, and then the dust is brushed off from the filter 6, and the dust passes through the dust outlet under the action of gravity and is collected by the collection box 28. During the delay process, the high-temperature flue gas can push the second piston 30 upward to slide in the air pressure box 29, increase the space for the high-temperature flue gas, and the transportation of the high-temperature flue gas will not be suspended. Repeating the above process can periodically clean the filter 6 automatically, solving the problem that the dust is not processed, the inner wall of the air pipe 2 forms a poor heat conduction layer on one side, affecting the heat transfer, and the dust needs to be processed but the operation is not timely.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-temperature flue gas purification and reuse system for industrial coal-fired boilers, characterized by: The invention comprises a heat utilization water tank (1), wherein an air pipe (2) is arranged in the heat utilization water tank (1), wherein the air pipe (2) is arranged in a bent structure, wherein the lower end of the air pipe (2) passes through the heat utilization water tank (1) and is connected to a flue gas pipe (5), and the upper end of the air pipe (2) passes through the heat utilization water tank (1), wherein the heat utilization water tank (1) is connected to a water inlet pipe (3) and a water outlet pipe (4) at the upper and lower ends. The inner wall of the flue gas pipe (5) is fixedly connected with a filter screen (6), the inner wall of the flue gas pipe (5) and the right side of the filter screen (6) are fixedly connected with a fixed frame (8), the inner wall of the fixed frame (8) is rotatably mounted with an impeller (9), a central shaft (10) is coaxially fixedly inserted in the impeller (9), a fixed block (12) is embedded in the upper end of the flue gas pipe (5) and the right side of the fixed frame (8), and the fixed block (12) is provided with a plurality of upper and lower openings. There is an air storage chamber (14) and a transfer chamber (13), and the lower end of the transfer chamber (13) is open. A first piston (15) is airtightly and slidably connected in the transfer chamber (13). A pneumatic component is connected between the first piston (15) and the central axis (10). The inner wall of the transfer chamber (13) is provided with a one-way air inlet (17) communicating with the outside world and a one-way air outlet (18) communicating with the air storage chamber (14). The inner wall of the air storage chamber (14) is provided with a one-way air inlet (17) communicating with the outside world and a one-way air outlet (18) communicating with the air storage chamber (14). The wall is connected to a high-pressure jet pipe (19), and the end of the high-pressure jet pipe (19) away from the fixed block (12) is connected to the flue gas pipe (5) and is located on the left side of the filter screen (6). A second solenoid valve (20) is installed at the end of the high-pressure jet pipe (19) close to the fixed block (12). A passive shaft (32) is rotatably connected in the filter screen (6) using a bearing. A plurality of cleaning brushes (21) are evenly and annularly fixedly connected to the passive shaft (32). An induction component is connected between the passive shaft (32) and the central axis (10). A first solenoid valve (7) is fixedly installed on the inner wall of the flue gas pipe (5) and on the left side of the filter screen (6). A dust outlet is opened at the lower end of the flue gas pipe (5) between the first solenoid valve (7) and the filter screen (6). A third solenoid valve (27) is installed in the dust outlet. A compression component is connected at the upper end of the flue gas pipe (5) and on the left side of the first solenoid valve (7).

2. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 1, characterized in that: The pneumatic assembly comprises a crank (11) fixedly connected to a central shaft (10); an end of the crank (11) away from the central shaft (10) is hinged to a connecting rod (16); and an end of the connecting rod (16) away from the crank (11) is hinged to a first piston (15).

3. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 1, characterized in that: One-way valves are installed at one end of the one-way air inlet (17), the one-way air outlet (18), and the high-pressure jet pipe (19) close to the flue gas pipe (5).

4. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 1, characterized in that: The sensing component includes a contact sensor (22) fixedly mounted on the right end of the passive shaft (32); a rod groove (23) is provided at the left end of the central shaft (10); a first spring (25) is fixedly connected to the inner wall of the rod groove (23); the other end of the first spring (25) is fixedly connected to a sliding rod (24), and the sliding rod (24) is slidably connected to the rod groove (23); and the left end of the sliding rod (24) is fixedly connected to a wind receiving plate (26).

5. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 1, characterized in that: A collecting box (28) is fixedly connected to the lower end of the flue gas pipe (5) at a position corresponding to the dust outlet.

6. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 4, characterized in that: The contact sensor (22) is signal-connected to a controller, and the controller is electrically connected to the first solenoid valve (7), the second solenoid valve (20), and the third solenoid valve (27).

7. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 1, characterized in that: The compression assembly comprises an air pressure box (29) which is in communication with the flue gas pipe (5) and has an open lower end. A second piston (30) is airtightly and slidably connected in the air pressure box (29).

8. The industrial coal-fired boiler high-temperature flue gas purification and reuse system according to claim 1, characterized in that: A wind bowl is provided on the side of each cleaning brush (21).

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