A heat recovery device for a boiler used in thermal power generation

Abstract

This utility model provides a heat recovery device for a thermal power boiler, relating to the technical field of boiler heat recovery devices. The device includes a housing with an inlet pipe and an outlet pipe fixedly connected to both ends. A water inlet pipe and a drain pipe are located on one side of the housing. The connecting pipes between the water inlet and drain pipes are arranged in a curved pattern inside the housing (not shown in the diagram). A filter device is installed on one side of the inlet pipe to filter the flue gas entering the housing. By installing a filter device, and by installing a circular pipe with an internal filter screen at one end of the inlet pipe, the flue gas passes through the filter screen before entering the housing. The filter screen blocks dust particles in the flue gas, minimizing the adhesion of dust particles to the outside of the water pipes inside the housing, reducing the probability of ash buildup on the outside of the pipes, and improving the effectiveness of the recovery device.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler heat recovery devices, and in particular to a heat recovery device for a thermal power boiler. Background Technology

[0002] A heat recovery device for thermal power boilers is a device used to recover waste heat from the flue gas or steam emitted by thermal power boilers to heat or dry water sources, which can significantly reduce energy waste.

[0003] When the heat recovery device is working, after the flue gas enters the device, the dust particles in the flue gas may adhere to the outside of the water flow pipe. The dust adhering to the outside of the pipe will form a layer of ash, which will reduce the heat conduction efficiency of the pipe and affect the heat recovery effect of the device. Utility Model Content

[0004] The purpose of this invention is to solve the problem that when a heat recovery device is in operation, dust particles in the flue gas may adhere to the outside of the water flow pipe after the flue gas enters the device. The dust adhering to the outside of the pipe will form a layer of ash, which will reduce the heat conduction efficiency of the pipe and affect the heat recovery effect of the device. Therefore, this invention proposes a heat recovery device for a thermal power boiler.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a heat recovery device for a thermal power boiler, comprising a housing, wherein a flue gas inlet pipe and a flue gas outlet pipe are fixedly connected to both ends of the housing, and a water inlet pipe and a water outlet pipe are provided on one side of the housing. The pipes connecting the water inlet pipe and the water outlet pipe are arranged in a curved manner inside the housing (not shown in the figure). A filter device is provided on one side of the flue gas inlet pipe to filter the flue gas entering the housing.

[0006] Preferably, the filtering device includes a circular tube and a mesh frame. Flanges are provided at both ends of the circular tube. Two slots are opened at one end of the inner wall of the circular tube. Two sliding blocks are provided inside the slots. Springs are provided at the upper and lower ends of the inner wall of the slots. The two ends of the springs are fixedly connected to one side of the blocks and one end of the inner wall of the slots, respectively. The outer edge of the block away from the spring is inclined. A filter screen is provided on the outer surface of the mesh frame. Grooves are fixedly connected to both sides of the mesh frame. Through grooves are opened on the outer surface of the grooves.

[0007] The effect achieved by the above components is as follows: When using the recycling device, connect the water supply pipe and the output pipe to the inlet pipe and the outlet pipe respectively. Connect one end of the round pipe to one end of the flue gas inlet pipe through a flange. Then connect the flue gas outlet pipe to the exhaust pipe. Next, align the two slots on both sides of the outer surface of the mesh frame with the two slots on one end of the inner wall of the round pipe. Push the mesh frame to insert the two slots into the two slots on both sides of the inner wall of the round pipe. When the surface of the slot contacts the outer inclined surface of the slot, it will squeeze the slot, causing the slot to slide on the inner wall of the slot and compress the spring. When the slot contacts the innermost part of the inner wall of the slot, the spring returns to its original state and pushes... The locking block moves outward and is inserted into the through groove on the outer surface of the slot block. The position of the slot block inside the slot block and the position of the mesh frame inside the round tube are fixed. The mesh frame is installed inside the round tube. Then, the flue gas delivery pipe is connected to the flange at the other end of the round tube through the flange. After the flue gas enters the round tube, it passes through the filter screen on the outer surface of the mesh frame to filter and block the dust particles in the flue gas. Then, the flue gas will enter the box through the smoke inlet pipe and come into contact with the outer surface of the water source flowing inside the box to exchange heat and heat the water source inside the pipe. The heated water source is discharged through the drain pipe, and the flue gas is discharged through the exhaust pipe.

[0008] Preferably, a plurality of rubber anti-slip strips are provided on one side of the card block, and the anti-slip strips are provided on the side of the card block away from the inner wall of the slot.

[0009] The effect achieved by the above components is as follows: when it is necessary to clean the filter screen on the mesh frame, the flue gas delivery pipe connected to the round pipe is removed, and the tool is used to push the anti-slip strip on one side of the locking block to make it easier to move the locking block away from the inside of the grooves on both sides of the mesh frame. Then, the mesh frame is pulled outward and removed to clean the mesh frame.

[0010] Preferably, a rotating shaft is rotatably connected to the outer surface of the mesh frame, a scraper is fixedly connected to one end of the rotating shaft, a number of hard bristles are provided on one side of the scraper, and a number of fan blades are fixedly connected to the end of the rotating shaft away from the scraper.

[0011] The effect achieved by the above components is as follows: after the mesh frame is installed, when the flue gas passes through the round pipe, it will blow the fan blades to rotate slowly. The fan blades will drive the rotating shaft and scraper to rotate. The hard bristles on one side of the scraper will sweep and clean the filter screen on the outer surface of the mesh frame, sweeping off the dust particles attached to the filter screen and preventing the dust particles from adhering to the outer surface of the filter screen and affecting the flue gas passage rate.

[0012] Preferably, the inner wall of the round tube has a through hole at the bottom end, and a threaded tube is threadedly connected to the inner wall of the through hole. A collection box is fixedly connected to the bottom end of the threaded tube.

[0013] The effect achieved by the above components is as follows: When installing the round tube, the threaded tube at the top of the collection box can be inserted into the through hole at the bottom of the round tube. By rotating the collection box, the threaded tube can be threadedly connected to the inner wall of the through hole, and the collection box can be installed at the bottom of the round tube. Most of the dust particles swept down by the scraper will enter the inside of the collection box through the through hole and the threaded tube for collection, thus preventing dust particles from accumulating inside the round tube.

[0014] Preferably, protrusions are fixedly connected to both sides of the outer surface of the mesh frame, with the protrusions extending out of the outer surface of the mesh frame on the side away from the filter screen.

[0015] The effect achieved by the above components is that when removing the mesh frame, the two protrusions on one side of the mesh frame can be pinched to make it easier to pull the mesh frame off.

[0016] Preferably, a conical ring is fixedly connected to one side of the inner wall of the mesh frame, and the conical ring is located on the outer surface of the mesh frame away from the filter screen.

[0017] The effect achieved by the above components is that when the scraper rotates to scrape off the dust particles on the outer surface of the filter screen by setting the conical ring, the dust particles can slide away from the screen frame along the conical ring, and are less likely to accumulate at the connection between the screen frame and the filter screen.

[0018] Preferably, a sealing sheet is fixedly connected to the outer surface of the threaded tube.

[0019] The effect achieved by the above components is that after the threaded pipe is connected to the through hole, the sealing plate will fit against the outside of the connection between the round pipe and the threaded pipe, further sealing the outside of the connection between the threaded pipe and the round pipe.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0021] In this invention, a filtration device is installed. A circular pipe with an internal filter screen is installed at one end of the flue gas inlet pipe. Before the flue gas enters the box, it passes through the filter screen, which blocks dust particles in the flue gas. This minimizes the possibility of dust particles in the flue gas adhering to the outside of the water pipe inside the box, reduces the probability of ash buildup on the outside of the pipe, and improves the effectiveness of the recycling device. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the circular tube portion of this utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the wire frame of this utility model;

[0025] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the circular tube portion of this utility model;

[0026] Figure 5 This is a three-dimensional structural diagram of the collection box of this utility model.

[0027] Legend: 1. Box body; 2. Filter device; 3. Smoke inlet pipe; 4. Water inlet pipe; 5. Drain pipe; 6. Smoke exhaust pipe; 21. Round pipe; 22. Slot; 23. Mesh frame; 24. Groove block; 25. Filter screen; 26. Spring; 27. Locking block; 28. Anti-slip strip; 29. ​​Shaft; 210. Scraper; 211. Fan blade; 212. Protrusion; 213. Conical ring; 214. Through hole; 215. Collection box; 216. Threaded pipe; 217. Sealing plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] In this embodiment:

[0032] like Figure 1-2 As shown, a heat recovery device for a thermal power boiler includes a housing 1. A flue gas inlet pipe 3 and a flue gas outlet pipe 6 are fixedly connected to both ends of the housing 1. A water inlet pipe 4 and a drain pipe 5 are provided on one side of the housing 1. The pipes connecting the water inlet pipe 4 and the drain pipe 5 are arranged in a curved manner inside the housing 1 (not shown in the figure). A filter device 2 is provided on one side of the flue gas inlet pipe 3 to filter the flue gas entering the housing 1.

[0033] Reference Figure 1-4As shown in this embodiment: the filter device 2 includes a circular tube 21 and a mesh frame 23. Flanges are provided at both ends of the circular tube 21. Two slots 22 are opened at one end of the inner wall of the circular tube 21. Two sliding blocks 27 are provided inside the slots 22. Springs 26 are respectively provided at the upper and lower ends of the inner wall of the slots 22. The two ends of the springs 26 are fixedly connected to one side of the blocks 27 and one end of the inner wall of the slots 22, respectively. The outer edge of the block 27 away from the spring 26 is beveled. A filter screen 25 is provided on the outer surface of the mesh frame 23. Grooves 24 are fixedly connected to both sides of the mesh frame 23. A passage is opened on the outer surface of the grooves 24. When using the recycling device, the water supply pipe and output pipe are connected to the inlet pipe 4 and the drain pipe 5 respectively. One end of the round pipe 21 is connected to one end of the flue gas inlet pipe 3 through a flange. Then, the flue gas output pipe is connected to the exhaust pipe 6. Subsequently, the positions of the two slot blocks 24 on both sides of the outer surface of the mesh frame 23 are aligned with the positions of the two slots 22 on one end of the inner wall of the round pipe 21. The mesh frame 23 is pushed to insert the two slot blocks 24 into the two slots on both sides of the inner wall of the round pipe 21. When the surface of the slot block 24 contacts the outer inclined surface of the locking block 27, it will squeeze the locking block 27, causing the locking block 27 to slide on the inner wall of the slot 22 and compress the spring 26. After the slot 24 contacts the innermost end of the inner wall of the slot 22, the spring 26 returns to its original state and pushes the locking block 27 outward, inserting the locking block 27 into the through groove on the outer surface of the slot 24. This fixes the position of the slot 24 inside the slot 22 and the position of the mesh frame 23 inside the round tube 21. The mesh frame 23 is then installed inside the round tube 21. Subsequently, the flue gas delivery pipe is connected to the flange at the other end of the round tube 21 through a flange. After the flue gas enters the round tube 21, it passes through the filter screen 25 on the outer surface of the mesh frame 23 to filter and block dust particles in the flue gas. Then, the flue gas enters the housing 1 through the flue gas inlet pipe 3 and mixes with water. The source heats the water inside the pipes flowing inside the housing 1 by contacting the outer surface of the pipes for heat exchange. The heated water is discharged through the drain pipe 5, and the flue gas is discharged through the exhaust pipe 6. By installing a filter device 2, a round pipe 21 with a filter screen 25 installed inside is installed at one end of the inlet pipe 3. The flue gas passes through the filter screen 25 before entering the housing 1. The filter screen 25 blocks dust particles in the flue gas, minimizing the adhesion of dust particles in the flue gas to the outside of the water pipes inside the housing 1, reducing the probability of dust and dirt buildup on the outside of the pipes, and improving the effectiveness of the recycling device.

[0034] Reference Figure 2-4As shown in this embodiment: a number of rubber anti-slip strips 28 are provided on one side of the locking block 27. The anti-slip strips 28 are located on the side of the locking block 27 away from the inner wall of the slot 22. When it is necessary to clean the filter screen 25 on the mesh frame 23, the flue gas conveying pipe connected to the round pipe 21 is removed. Using a tool to press against the anti-slip strip 28 on one side of the locking block 27, it is easier to push the locking block 27 to move away from the inside of the slot blocks 24 on both sides of the mesh frame 23. Then, the mesh frame 23 can be pulled out and removed to clean the mesh frame 23.

[0035] Reference Figure 2-5 As shown in this embodiment: a rotating shaft 29 is rotatably connected to the outer surface of the mesh frame 23. A scraper 210 is fixedly connected to one end of the rotating shaft 29. Several stiff bristles are provided on one side of the scraper 210. Several fan blades 211 are fixedly connected to the end of the rotating shaft 29 away from the scraper 210. After the mesh frame 23 is installed, when the flue gas passes through the circular pipe 21, it will blow the fan blades 211 to rotate slowly. The fan blades 211 drive the rotating shaft 29 and the scraper 210 to rotate. The stiff bristles on one side of the scraper 210 sweep and clean the filter screen 25 on the outer surface of the mesh frame 23, sweeping off the dust particles attached to the filter screen 25, and preventing dust particles from adhering to the outer surface of the filter screen 25 and affecting the flue gas flow. The air passage rate is controlled by a through hole 214 at the bottom of the inner wall of the circular tube 21. A threaded tube 216 is threadedly connected to the inner wall of the through hole 214. A collection box 215 is fixedly connected to the bottom of the threaded tube 216. When installing the circular tube 21, the threaded tube 216 at the top of the collection box 215 can be inserted into the through hole 214 at the bottom of the circular tube 21. The collection box 215 is rotated so that the threaded tube 216 is threadedly connected to the inner wall of the through hole 214. The collection box 215 is then installed at the bottom of the circular tube 21. Most of the dust particles swept down by the scraper 210 will enter the inside of the collection box 215 through the through hole 214 and the threaded tube 216 for collection, thus preventing dust particles from accumulating inside the circular tube 21.

[0036] Reference Figure 2-5As shown in this embodiment: Two protrusions 212 are fixedly connected to both sides of the outer surface of the mesh frame 23. The protrusions 212 protrude from the outer surface of the mesh frame 23 on the side away from the filter screen 25. When removing the mesh frame 23, the two protrusions 212 on one side of the mesh frame 23 can be pinched to more easily pull the mesh frame 23 off. A conical ring 213 is fixedly connected to one side of the inner wall of the mesh frame 23. The conical ring 213 is located on the outer surface of the mesh frame 23 on the side away from the filter screen 25. By setting the conical ring 21... 3. When the scraper 210 rotates to scrape off the dust particles on the outer surface of the filter screen 25, the dust particles can slide away from the frame 23 along the conical ring 213, and are not easy to accumulate at the connection between the frame 23 and the filter screen 25. A sealing plate 217 is fixedly connected to the outer surface of the threaded tube 216. After the threaded tube 216 is connected to the through hole 214, the sealing plate 217 will fit against the outside of the connection between the round tube 21 and the threaded tube 216, further sealing the outside of the connection between the threaded tube 216 and the round tube 21.

[0037] Working principle: When using the recycling device, connect the water supply pipe and the output pipe to the inlet pipe 4 and the drain pipe 5 respectively. Connect one end of the circular pipe 21 to one end of the flue gas inlet pipe 3 through a flange. Then connect the flue gas output pipe to the exhaust pipe 6. Next, align the positions of the two slots 24 on both sides of the outer surface of the mesh frame 23 with the positions of the two slots 22 on one end of the inner wall of the circular pipe 21. Push the mesh frame 23 to insert the two slots 24 into the two slots on both sides of the inner wall of the circular pipe 21. When the surface of the slot 24 contacts the outer inclined surface of the locking block 27, it will squeeze the locking block 27, causing the locking block 27 to be inside the slot 22. The wall slides and compresses the spring 26. When the groove block 24 contacts the innermost end of the inner wall of the slot 22, the spring 26 returns to its original state and pushes the locking block 27 outward. The locking block 27 is inserted into the through groove on the outer surface of the groove block 24, fixing the position of the groove block 24 inside the slot 22 and the position of the mesh frame 23 inside the round tube 21. The mesh frame 23 is installed inside the round tube 21. Then, the collection box 215 is rotated so that the threaded tube 216 is threadedly connected to the inner wall of the through hole 214. The collection box 215 is installed at the bottom end of the round tube 21. Then, the flue gas conveying pipe is connected to the other end of the round tube 21 through the flange. The flue gas enters the circular pipe 21 and passes through the filter screen 25 on the outer surface of the mesh frame 23, where dust particles in the flue gas are filtered and blocked. As the flue gas passes through the circular pipe 21, it causes the fan blades 211 to rotate slowly. The fan blades 211 drive the rotating shaft 29 and the scraper 210 to rotate. The hard bristles on one side of the scraper 210 clean the filter screen 25 on the outer surface of the mesh frame 23, removing the dust particles attached to the filter screen 25. Subsequently, the flue gas enters the housing 1 through the flue gas inlet pipe 3 and comes into contact with the outer surface of the water supply pipe inside the housing 1 for heat exchange, thus improving the heat exchange within the pipe. The water source in the part is heated, and the heated water is discharged through the drain pipe 5. The flue gas is discharged through the exhaust pipe 6. When it is necessary to clean the filter screen 25 on the mesh frame 23, use a tool to push the anti-slip strip 28 on one side of the locking block 27 to make it easier to move the locking block 27 away from the inside of the groove blocks 24 on both sides of the mesh frame 23. Then pull the mesh frame 23 outward and remove the mesh frame 23 to clean it. Rotate the collection box 215 to disconnect the threaded connection between the threaded tube 216 and the inner wall of the through hole 214 and remove the collection box 215 to clean the dust particles inside the collection box 215.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat recovery device for a boiler used in thermal power, comprising a housing (1), characterized in that: The two ends of the box (1) are respectively fixedly connected to the smoke inlet pipe (3) and the smoke outlet pipe (6). The side of the box (1) is provided with the water inlet pipe (4) and the drain pipe (5). The pipes connecting the water inlet pipe (4) and the drain pipe (5) are arranged in a curved manner inside the box (1). The side of the smoke inlet pipe (3) is provided with a filter device (2) that can filter the smoke entering the box (1).

2. The heat recovery device for a thermal power boiler according to claim 1, characterized in that: The filter device (2) includes a round tube (21) and a mesh frame (23). Flanges are provided at both ends of the round tube (21). Two slots (22) are opened at one end of the inner wall of the round tube (21). Two sliding blocks (27) are provided inside the slots (22). Springs (26) are provided at the upper and lower ends of the inner wall of the slots (22). The two ends of the springs (26) are fixedly connected to one side of the blocks (27) and one end of the inner wall of the slots (22). The outer edge of the block (27) away from the spring (26) is inclined. A filter screen (25) is provided on the outer surface of the mesh frame (23). A groove block (24) is fixedly connected to both sides of the mesh frame (23). A through groove is opened on the outer surface of the groove block (24).

3. A heat recovery device for a thermal power boiler according to claim 2, characterized in that: A number of rubber anti-slip strips (28) are provided on one side of the card block (27), and the anti-slip strips (28) are provided on the side of the card block (27) away from the inner wall of the slot (22).

4. The heat recovery device for a thermal power boiler according to claim 3, characterized in that: The outer surface of the mesh frame (23) is rotatably connected to a rotating shaft (29). One end of the rotating shaft (29) is fixedly connected to a scraper (210). A number of hard bristles are provided on one side of the scraper (210). A number of fan blades (211) are fixedly connected to the end of the rotating shaft (29) away from the scraper (210).

5. A heat recovery device for a thermal power boiler according to claim 4, characterized in that: The inner wall of the round tube (21) has a through hole (214) at the bottom end, and a threaded tube (216) is threadedly connected to the inner wall of the through hole (214). A collection box (215) is fixedly connected to the bottom end of the threaded tube (216).

6. A heat recovery device for a thermal power boiler according to claim 5, characterized in that: The outer surface of the mesh frame (23) is fixedly connected to two sides of the protrusions (212), which protrude from the outer surface of the mesh frame (23) away from the filter screen (25).

7. A heat recovery device for a thermal power boiler according to claim 6, characterized in that: A conical ring (213) is fixedly connected to one side of the inner wall of the mesh frame (23), and the conical ring (213) is located on the outer surface of the mesh frame (23) away from the filter screen (25).

8. A heat recovery device for a thermal power boiler according to claim 7, characterized in that: A sealing plate (217) is fixedly connected to the outer surface of the threaded tube (216).

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