A waste heat recovery device for a coal-fired boiler

Abstract

The utility model belongs to the technical field of waste heat recovery, specifically disclose a waste heat recovery device for coal -fired boiler, including filter assembly, self -locking assembly and sealing assembly, filter assembly includes waste heat recovery tank, and the heat exchange pipe is fixedly connected in waste heat recovery tank, and the filter box is fixedly connected in waste heat recovery tank bottom, and the absorption frame is fixedly connected in filter box, and the installation pipe is fixedly connected in filter box bottom, and the self -locking assembly includes fixed block and connecting box, and the fixed block is fixedly connected in the front of absorption frame, and the side of filter box is fixedly connected with base, and the inside rotation is connected with the adjusting screw of base, and the upper portion of adjusting screw is connected with connecting box in screw thread. The utility model sets up self -locking assembly, has realized the automatic locking of absorption frame, and the contact surface of first limit block is arc, still set up the counter weight, make absorption frame when advancing can smoothly extrude first limit block around rotation rod rotation, and after reaching in place, first limit block is automatically inserted into the limiting slot in the inside of fixed block and forms the locking.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery technology, specifically a waste heat recovery device for coal-fired boilers. Background Technology

[0002] Coal-fired boilers, as core equipment for industrial production and residential heating, produce high-temperature flue gas containing a large amount of waste heat after fuel combustion. The exhaust temperature typically reaches 280-350℃, carrying away 20-50% of the boiler's total heat output, resulting in serious energy waste. To improve energy efficiency, existing technologies often employ waste heat recovery devices at the boiler's tail end to recover and utilize the waste heat from the flue gas. Simultaneously, it is necessary to filter corrosive impurities such as soot and sulfides in the flue gas to prevent damage to heat exchange components. Existing publicly available technical solution CN219815640U discloses a waste heat recovery device for coal-fired boiler flue gas. This device relies on a spring to drive a limiting block to fix the filter frame. However, the flue gas temperature in coal-fired boilers is typically high, and springs are prone to elastic decay, metal fatigue, or even breakage under such high-temperature conditions. If the spring fails, the limiting block cannot secure the filter frame, leading to loosening between the filter and absorption frames, causing a short circuit in the flue gas. This results in unfiltered gas directly entering the waste heat recovery box, drastically reducing the filtration effect and potentially causing sulfides and soot in the unpurified flue gas to corrode the heat exchange tubes. Therefore, it is necessary to develop new waste heat recovery devices for coal-fired boilers to meet the needs. Utility Model Content

[0003] To address the above technical problems, this utility model provides a waste heat recovery device for coal-fired boilers.

[0004] To solve the above technical problems, the technical solution adopted by this utility model is as follows: a waste heat recovery device for a coal-fired boiler, comprising a filter assembly, a self-locking assembly, and a sealing assembly. The filter assembly includes a waste heat recovery box, in which a heat exchange tube is fixedly connected. A filter box is fixedly connected to the bottom of the waste heat recovery box, and an absorption frame is fixedly connected inside the filter box. An installation pipe is fixedly connected to the bottom of the filter box. The self-locking assembly includes a fixing block and a connecting box. The fixing block is fixedly connected to the front of the absorption frame. A base is fixedly connected to the side of the filter box. An adjusting screw is rotatably connected inside the base. The upper part of the adjusting screw is threadedly connected to the connecting box. The sealing assembly includes a first fixing plate and a transmission screw. The transmission screw is rotatably connected to one side inside the filter box. The first fixing plate is threadedly connected to the transmission screw.

[0005] Furthermore, a connecting frame is detachably connected to the rear end of the absorption frame, and a filter screen is detachably connected to the bottom of the connecting frame.

[0006] Furthermore, a limiting groove is formed within the fixing block.

[0007] Furthermore, a rotating rod is rotatably connected inside the connecting box, a first limiting block is rotatably connected to the rotating rod, a counterweight is fixedly connected to the bottom of the first limiting block, and a second limiting block is fixedly connected to the top of the connecting box.

[0008] Furthermore, a first connecting plate is fixedly connected to one side of the first fixing plate, a metal sealing ring is fixedly connected to the bottom of the first connecting plate, and a first protective plate is fixedly connected to the upper and lower sides of the first fixing plate.

[0009] Furthermore, a second connecting plate is fixedly connected to the lower part of the absorption frame, a second fixing plate is fixedly connected to one side of the second connecting plate, and a second protective plate is fixedly connected to the upper and lower ends of the second fixing plate.

[0010] This utility model has the following advantages compared with the prior art:

[0011] 1. This utility model is equipped with a self-locking component, which realizes the automatic locking of the absorption frame. The contact surface of the first limiting block is arc-shaped, and a counterweight block is also provided, so that the first limiting block can be smoothly squeezed to rotate around the rotating rod when the absorption frame is pushed in. After it is in place, the first limiting block automatically locks into the limiting groove inside the fixed block to form a lock, which prevents the absorption frame from shifting due to vibration. Moreover, the connecting box can be moved down by rotating the adjusting screw on the base, which can quickly release the self-locking and greatly improve the convenience of disassembly and maintenance of the filter component.

[0012] 2. This utility model is equipped with a sealing component, which is a bidirectional pressure sealing design. Utilizing the opposing internal threads of the first and second fixing plates, the first and second connecting plates are driven to approach each other synchronously, forming a bidirectional compression on the absorption frame and filter screen. Combined with the elastic deformation of the metal sealing rings at the lower end of the first and upper ends of the second connecting plates, the sealing gap is filled, achieving an all-round seal. This effectively blocks the path of flue gas leakage from the edges of the absorption frame and filter screen, improves the waste heat recovery efficiency, and reduces the corrosion of components such as heat exchange tubes by flue gas.

[0013] 3. This utility model is equipped with a first protective plate and a second protective plate, which can cover the exposed part of the transmission screw, prevent the dust in the flue gas from adhering to the surface of the transmission screw and the sulfide from corroding the transmission screw, ensure the long-term transmission accuracy of the transmission screw, and extend the overall service life of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the left side of the filter assembly of this utility model.

[0016] Figure 3 This is a schematic diagram of the self-locking component structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the rear structure of the filter assembly of this utility model.

[0018] Figure 5 This is a schematic diagram of the sealing component structure of this utility model.

[0019] The components include: 1. Filter assembly; 101. Waste heat recovery box; 102. Heat exchange tube; 103. Installation pipe; 104. Filter box; 105. Absorption frame; 106. Filter screen; 107. Connecting frame; 2. Self-locking assembly; 201. Fixing block; 202. First limiting block; 203. Second limiting block; 204. Connecting box; 205. Rotating rod; 206. Counterweight block; 207. Base; 208. Adjusting screw; 3. Sealing assembly; 301. Transmission screw; 302. First connecting plate; 303. Second connecting plate; 304. First fixing plate; 305. Second fixing plate; 306. First protective plate; 307. Second protective plate. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figures 1-5 The waste heat recovery device for a coal-fired boiler shown includes a filter assembly 1, a self-locking assembly 2, and a sealing assembly 3. The filter assembly 1 includes a waste heat recovery box 101, a heat exchange tube 102 fixedly connected inside the waste heat recovery box 101, a filter box 104 fixedly connected to the bottom of the waste heat recovery box 101, an absorption frame 105 fixedly connected inside the filter box 104, wherein the absorption frame 105 is filled with an adsorbent; an installation pipe 103 is fixedly connected to the bottom of the filter box 104; the self-locking assembly 2 includes a fixing block. The filter box 104 and the connecting box 201 are fixedly connected to the front of the absorption frame 105. The base 207 is fixedly connected to the side of the filter box 104. The adjusting screw 208 is rotatably connected inside the base 207. The upper part of the adjusting screw 208 is threadedly connected to the connecting box 204. The sealing assembly 3 includes a first fixing plate 304 and a transmission screw 301. The transmission screw 301 is rotatably connected to one side inside the filter box 104. The first fixing plate 304 is threadedly connected to the transmission screw 301.

[0022] For easy filtration, a connecting frame 107 is detachably connected to the rear end of the absorption frame 105, and a filter screen 106 is detachably connected to the bottom of the connecting frame 107.

[0023] To limit the movement, a limit groove is provided in the fixing block 201, which is made of stainless steel.

[0024] To provide gravity-based reset, a rotating rod 205 is rotatably connected inside the connecting box 204, and a first limiting block 202 is rotatably connected to the rotating rod 205. A counterweight 206 is fixedly connected to the bottom of the first limiting block 202, and a second limiting block 203 is fixedly connected to the top of the connecting box 204. Under the gravity of the counterweight 206, the first limiting block 202 automatically returns to a vertical state.

[0025] To facilitate the protection of the transmission lead screw 301, a first connecting plate 302 is fixedly connected to one side of the first fixed plate 304, a metal sealing ring is fixedly connected to the bottom of the first connecting plate 302, and a first protective plate 306 is fixedly connected to the upper and lower parts of the first fixed plate 304.

[0026] To enhance the protective effect, a second connecting plate 303 is fixedly connected to the lower part of the absorption frame 105, a second fixing plate 305 is fixedly connected to one side of the second connecting plate 303, and a second protective plate 307 is fixedly connected to the upper and lower ends of the second fixing plate 305.

[0027] The specific working process of this utility model is as follows:

[0028] During waste heat recovery, the high-temperature flue gas discharged from the boiler enters the filter box 104 through the installation pipe 103 at the lower end of the filter box 104. It first passes through the filter screen 106 at the lower end of the connecting frame 107 to filter out most of the particulate impurities, and then passes through the absorption frame 105, where the adsorbent inside removes corrosive components such as sulfides. The purified high-temperature flue gas continues to rise into the waste heat recovery box 101, where it exchanges heat with the heat exchange tube 102 inside the waste heat recovery box 101, transferring the waste heat to the cold water inside the heat exchange tube 102, thus realizing waste heat recovery. The cooled clean flue gas is then discharged from the upper outlet of the waste heat recovery box 101.

[0029] During maintenance, push the connecting frame 107 to push the absorbent frame 105 filled with adsorbent along the guide rail inside the filter box 104, and at the same time drive the filter screen 106 to move synchronously. The filter box 104 has reserved appropriate margin space for the installation positions of the absorbent frame 105 and the filter screen 106, which can buffer the deviation of the push position of the absorbent frame 105 and ensure that the first limiting block 202 smoothly enters the limiting groove opened inside the fixed block 201.

[0030] During the advancement process, when the lower edge of the front face of the fixed block 201 contacts the rear edge of the upper face of the second limiting block 203, because the rear edge of the upper face of the first limiting block 202 is arc-shaped and the second limiting block 203 has a triangular structure that allows for unobstructed rotation, the first limiting block 202 will rotate counterclockwise around the rotating rod 205, which will not hinder the continued advancement of the absorption frame 105. When the first limiting block 202 enters the limiting groove of the fixed block 201, the first limiting block 202 automatically returns to a vertical state under the gravity of the counterweight 206 installed at the lower end of the first limiting block 202. If the fixed block 201 moves backward due to vibration of the absorption frame 105, it will simultaneously pull the first limiting block 202 to rotate clockwise. The lower end of the first limiting block 202 will abut against the lower end of the second limiting block 203 to form a mechanical lock, thereby restricting the movement of the absorption frame 105 and completing the self-locking fixation of the absorption frame 105.

[0031] Then, the transmission screw 301 inside the filter box 104 is rotated, which drives the first fixed plate 304 to move downward through the threaded transmission, thereby driving the first connecting plate 302 to move downward synchronously. Since the internal threads of the first fixed plate 304 and the second fixed plate 305 rotate in opposite directions, the rotation of the transmission screw 301 will drive the second connecting plate 303 to move upward synchronously, so that the first connecting plate 302 and the second connecting plate 303 form a bidirectional compression on the absorption frame 105, and at the same time compress the metal sealing rings at the lower end of the first connecting plate 302 and the upper end of the second connecting plate 303. The gap is filled by the elastic deformation of the sealing rings, thereby achieving the sealing of the absorption frame 105.

[0032] During this process, the first protective plate 306 at the top and bottom of the first fixed plate 304 and the second protective plate 307 at the top and bottom of the second fixed plate 305 will move synchronously with the fixed plate to cover the exposed part of the transmission screw 301, preventing dust in the flue gas from adhering and sulfides from corroding the transmission screw 301, thus ensuring its transmission accuracy. In addition, the upper and lower ends of the filter screen 106 are also equipped with the same first connecting plate 302, second connecting plate 303, first fixing plate 304 and second fixing plate 305. While sealing the absorption frame 105, the filter screen 106 is sealed simultaneously. The pressure force can also play an auxiliary role in fixing the absorption frame 105 and the filter screen 106, preventing them from shifting under the impact of flue gas. When it is necessary to replace the adsorbent in the absorption frame 105 or clean the filter screen 106, rotate the adjusting screw 208, and drive the connecting box 204 to move down through the threaded transmission until the first limiting block 202 is completely disengaged from the limiting groove of the fixing block 201, releasing the self-locking state. At this time, the absorption frame 105 and the connecting frame 107 can be pulled out for subsequent maintenance operations.

Claims

1. A waste heat recovery device for a coal-fired boiler, characterized in that: The system includes a filter assembly (1), a self-locking assembly (2), and a sealing assembly (3). The filter assembly (1) includes a waste heat recovery box (101), a heat exchange tube (102) fixedly connected inside the waste heat recovery box (101), a filter box (104) fixedly connected to the bottom of the waste heat recovery box (101), an absorption frame (105) fixedly connected inside the filter box (104), and an installation pipe (103) fixedly connected to the bottom of the filter box (104). The self-locking assembly (2) includes a fixing block (201) and a connecting box (204). The filter box (104) is fixedly connected to the front of the absorption frame (105), and a base (207) is fixedly connected to the side of the filter box (104). An adjusting screw (208) is rotatably connected inside the base (207), and a connecting box (204) is threadedly connected to the upper part of the adjusting screw (208). The sealing assembly (3) includes a first fixing plate (304) and a transmission screw (301). The transmission screw (301) is rotatably connected to one side inside the filter box (104), and the first fixing plate (304) is threadedly connected to the transmission screw (301).

2. The waste heat recovery device for coal-fired boilers according to claim 1, characterized in that: The absorption frame (105) is detachably connected to a connecting frame (107) at its rear end, and a filter screen (106) is detachably connected to the bottom of the connecting frame (107).

3. The waste heat recovery device for coal-fired boilers according to claim 1, characterized in that: A limiting groove is provided in the fixing block (201).

4. The waste heat recovery device for a coal-fired boiler according to claim 1, characterized in that: A rotating rod (205) is rotatably connected inside the connecting box (204). A first limiting block (202) is rotatably connected on the rotating rod (205). A counterweight block (206) is fixedly connected to the bottom of the first limiting block (202). A second limiting block (203) is fixedly connected to the top of the connecting box (204).

5. The waste heat recovery device for a coal-fired boiler according to claim 1, characterized in that: A first connecting plate (302) is fixedly connected to one side of the first fixing plate (304), a metal sealing ring is fixedly connected to the bottom of the first connecting plate (302), and a first protective plate (306) is fixedly connected to the upper and lower sides of the first fixing plate (304).

6. The waste heat recovery device for a coal-fired boiler according to claim 1, characterized in that: A second connecting plate (303) is fixedly connected to the bottom of the absorption frame (105), a second fixing plate (305) is fixedly connected to one side of the second connecting plate (303), and a second protective plate (307) is fixedly connected to the upper and lower ends of the second fixing plate (305).

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