Boiler waste heat recovery device

Abstract

The utility model discloses a boiler waste heat recovery device which comprises a waste heat collection box, a membrane type coiled pipe is arranged in the waste heat collection box, the membrane type coiled pipe comprises a first heat exchange pipe, a second heat exchange pipe, a third heat exchange pipe and a fourth heat exchange pipe, the tail end of the right side of the first heat exchange pipe is connected with a water outlet pipe, and the tail end of the right side of the fourth heat exchange pipe is connected with a water outlet pipe. The tail end of the right side of the fourth heat exchange pipe is connected with a water inlet pipe, the water inlet pipe extends upwards to penetrate through the waste heat collection box to be connected with a pump outlet pipe, the right end of the pump outlet pipe is connected with a water delivery pump, the right side of the water delivery pump is connected with a pump inlet pipe, the pump inlet pipe is connected with a clean water tank, and the left side of the waste heat collection box is connected with a flue gas header pipe. A negative pressure fan is installed on the right side of the upper portion of the waste heat collecting box. The device is simple in structure and convenient to manufacture and operate, the problems in the prior art can be effectively solved, and good economic benefits are created.

Description

Technical Field

[0001] This application relates to the field of boiler waste heat recovery, specifically to a boiler waste heat recovery device. Background Technology

[0002] Boilers are crucial equipment in enterprise production operations. The exhaust gases produced during boiler combustion contain a significant amount of heat; direct emission would result in substantial heat waste. To address this issue, engineers have developed boiler waste heat recovery devices. These devices recover and reuse the waste heat released from the flue gas after boiler combustion, while simultaneously reducing emissions of carbon dioxide and other carbon oxides, thus achieving energy conservation and emission reduction. However, in existing boiler waste heat recovery devices, the contact area between the heat and the water in the pipes is relatively small, which limits the heat exchange efficiency of the heat exchange tubes and affects the overall heat exchange efficiency of the device. Utility Model Content

[0003] To solve the aforementioned technical problems, the inventor, based on his extensive experience in the boiler field, developed a boiler waste heat recovery device.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a boiler waste heat recovery device, comprising a waste heat collection box, wherein the waste heat collection box has a built-in membrane serpentine tube, the membrane serpentine tube comprising a first heat exchange tube, a second heat exchange tube, a third heat exchange tube and a fourth heat exchange tube, the right end of the first heat exchange tube is connected to an outlet pipe, the right end of the fourth heat exchange tube is connected to an inlet pipe, the inlet pipe extends upward through the waste heat collection box and connects to a pump outlet pipe, the right end of the pump outlet pipe is connected to a water pump, the right side of the water pump is connected to a pump inlet pipe, the pump inlet pipe is connected to a clear water tank, the left side of the waste heat collection box is connected to a flue gas main pipe, and a negative pressure fan is installed on the upper right side of the waste heat collection box.

[0005] Furthermore, a first filter is installed on the main flue gas duct, a fan inlet pipe connects the negative pressure fan and the waste heat collection box, a second filter is installed on the fan inlet pipe, and a fan outlet pipe connects to the fan outlet. The mesh size of the first filter is M1, and the mesh size of the second filter is M2, where M1 > M2. A larger mesh size indicates a smaller filter pore size.

[0006] Furthermore, the first heat exchange tube, the second heat exchange tube, the third heat exchange tube, and the fourth heat exchange tube are arranged sequentially from top to bottom. Each heat exchange tube consists of a straight tube and an elbow. The first heat exchange tube, the second heat exchange tube, the third heat exchange tube, and the fourth heat exchange tube are combined together to form a "snake" shape.

[0007] Furthermore, a drain valve is provided at the bottom right side of the fourth heat exchange tube.

[0008] Furthermore, a safety pressure relief valve is provided at the top left end of the first heat exchange tube, and an exhaust valve is provided on the right side of the safety pressure relief valve.

[0009] Furthermore, clean water enters through the inlet pipe, passes through the fourth heat exchange pipe, the third heat exchange pipe, the second heat exchange pipe, and the first heat exchange pipe in sequence, and flows out through the outlet pipe.

[0010] Furthermore, the waste heat collection box is equipped with at least four sets of "membrane" serpentine tubes, which are combined together.

[0011] Furthermore, the outer wall of the waste heat collection box is wrapped with insulating cotton.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Clean water enters through the inlet pipe, flows through the fourth, third, second, and first heat exchange pipes in sequence, and exits through the outlet pipe. The entire pipeline is serpentine in shape. This design can effectively increase the flow time of clean water in the heat exchange pipes and expand the heat exchange area, thereby effectively exchanging heat with the high-temperature flue gas transported from the flue gas main pipe, thus effectively improving the heat exchange efficiency.

[0014] 2. The inventor has installed auxiliary devices such as safety pressure relief valve, exhaust valve and drain valve on the heat exchange tube, which can effectively ensure the normal operation of the waste heat equipment.

[0015] 3. This utility model has a simple structure, is easy to manufacture and operate, and can effectively solve the problems existing in the current technology, creating better economic benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the combination of the first heat exchanger tube, the second heat exchanger tube, the third heat exchanger tube, and the fourth heat exchanger tube.

[0018] Figure 3 This is an exploded view of the first, second, third, and fourth heat exchange tubes.

[0019] Figure 4 This is an exploded view of a single heat exchange tube.

[0020] Attached reference numerals: 1. Waste heat collection box; 2. Membrane-type serpentine tube; 201. First heat exchange tube; 202. Second heat exchange tube; 203. Third heat exchange tube; 204. Fourth heat exchange tube; 205. Straight pipe; 206. Elbow; 3. Clear water tank; 4. Water pump; 5. Pump inlet pipe; 6. Pump outlet pipe; 7. Water outlet pipe; 8. Exhaust valve; 9. Safety pressure relief valve; 10. Sewage valve; 11. Flue gas main pipe; 12. First filter; 13. Fan inlet pipe; 14. Second filter; 15. Negative pressure fan; 16. Fan outlet pipe; 17. Water inlet pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-4As shown, a boiler waste heat recovery device includes a waste heat collection box 1. The waste heat collection box 1 contains a membrane-type serpentine tube 2. The membrane-type serpentine tube 2 includes a first heat exchange tube 201, a second heat exchange tube 202, a third heat exchange tube 203, and a fourth heat exchange tube 204. The right end of the first heat exchange tube 201 is connected to an outlet pipe 7, and the right end of the fourth heat exchange tube 204 is connected to an inlet pipe 17. The inlet pipe 17 extends upwards, passes through the waste heat collection box 1, and connects to a pump outlet pipe 6. The right end of the pump outlet pipe 6 is connected to a water pump 4. The right side of the water pump 4 is connected to a pump inlet pipe 5, which is connected to a clear water tank 3. The left side of the waste heat collection box 1 is connected to a flue gas main pipe 11, and a negative pressure fan 15 is installed on the upper right side of the waste heat collection box 1. The temperature of the flue gas entering the negative pressure fan 15 must not exceed 80℃.

[0026] In this embodiment, a first filter 12 is installed on the flue gas main duct 11, a fan inlet pipe 13 is connected between the negative pressure fan 15 and the waste heat collection box 1, a second filter 14 is installed on the fan inlet pipe 13, and a fan outlet pipe 16 is connected to the fan outlet. The mesh size of the first filter 12 is M1, the mesh size of the second filter 14 is M2, and M2 > M1.

[0027] In this embodiment, the first heat exchange tube 201, the second heat exchange tube 202, the third heat exchange tube 203, and the fourth heat exchange tube 204 are arranged sequentially from top to bottom. Each heat exchange tube 2 consists of a straight tube 205 and an elbow 206. The first heat exchange tube 201, the second heat exchange tube 202, the third heat exchange tube 203, and the fourth heat exchange tube 204 are combined together to form a "snake" shape. The straight tube 205 is connected to the elbow 206 by welding.

[0028] In this embodiment, a drain valve 10 is provided at the bottom right side of the fourth heat exchange tube 204.

[0029] In this embodiment, a safety pressure relief valve 9 is provided at the top left end of the first heat exchange tube 201, and an exhaust valve 10 is provided on the right side of the safety pressure relief valve 9.

[0030] In this embodiment, clean water enters from the inlet pipe 17, passes through the fourth heat exchange pipe 204, the third heat exchange pipe 203, the second heat exchange pipe 202 and the first heat exchange pipe 201 in sequence, and flows out from the outlet pipe 7.

[0031] In this embodiment, the waste heat collection box 1 is provided with at least 4 sets of "membrane" serpentine tubes 2, which are combined together.

[0032] In this embodiment, the outer wall of the waste heat collection box 1 is wrapped with heat insulation cotton.

[0033] In practical use, the exhaust valve 8 is first opened, and the water pump 4 is started. Clean water from the clean water tank 3 enters the inlet pipe 17 through the pump inlet pipe 5 and the pump outlet pipe 6, and flows out from the outlet pipe 7 through the fourth heat exchange pipe 204, the third heat exchange pipe 203, the second heat exchange pipe 202, and the first heat exchange pipe 201 in sequence. At this time, the exhaust valve 8 is closed. Simultaneously, the negative pressure fan 15 is started, and the high-temperature flue gas from the flue gas main pipe 11 enters the waste heat collection box 1 through the first filter 12, where it fully exchanges heat with the clean water in the "membrane" serpentine tube 2. After heat exchange, the clean water continuously enters the next process from the outlet pipe 7. During the heat exchange process, if the clean water in the "membrane" serpentine tube 2 experiences overpressure, the exhaust valve 8 should be opened in time to release the pressure. Under the action of the negative pressure fan 15, the high-temperature flue gas enters from the left end of the waste heat collection box 1, passes through the fan inlet pipe 13 on the upper right, passes through the second filter 14, and then enters the next process through the fan outlet pipe 16.

[0034] When the membrane-type serpentine pipe 2 malfunctions, open the drain valve 10 to ensure that the hot water in the pipe is completely drained before proceeding with repairs.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A boiler heat recovery device, characterized by: The waste heat collecting box is internally provided with "membrane type" serpentine pipes, the "membrane type" serpentine pipes include first heat exchange pipes, second heat exchange pipes, third heat exchange pipes and fourth heat exchange pipes, the right end of the first heat exchange pipes is connected with a water outlet pipe, the right end of the fourth heat exchange pipes is connected with a water inlet pipe, the water inlet pipe extends upwards and penetrates through the waste heat collecting box and is connected with a pump outlet pipe, the right end of the pump outlet pipe is connected with a water delivery pump, the right side of the water delivery pump is connected with a pump inlet pipe, the pump inlet pipe is connected with a clean water pool, the left side of the waste heat collecting box is connected with a flue gas main pipe, the right side above the waste heat collecting box is installed with a negative pressure fan, the right bottom of the fourth heat exchange pipes is provided with a blowdown valve, the top left end of the first heat exchange pipes is provided with a safety relief valve, the right side of the safety relief valve is provided with an exhaust valve.

2. A boiler heat recovery device according to claim 1, characterised in that: The flue gas main pipe is installed with a first filter, the negative pressure fan and the waste heat collecting box are connected with a fan air inlet pipe, the fan air inlet pipe is installed with a second filter, the fan outlet is connected with a fan air outlet pipe, the mesh number of the first filter is M1, the mesh number of the second filter is M2, M1>M2.

3. A boiler heat recovery device according to claim 1, characterized in that: The first heat exchange pipes, the second heat exchange pipes, the third heat exchange pipes and the fourth heat exchange pipes are arranged in sequence from top to bottom, each heat exchange pipe is composed of a straight pipe and an elbow, the first heat exchange pipes, the second heat exchange pipes, the third heat exchange pipes and the fourth heat exchange pipes are combined into a "snake" shape.

4. A boiler heat recovery device according to claim 1, characterized in that: The clean water enters from the water inlet pipe, passes through the fourth heat exchange pipes, the third heat exchange pipes, the second heat exchange pipes and the first heat exchange pipes in sequence and flows out from the water outlet pipe.

5. A boiler heat recovery device according to claim 1, characterized in that: The waste heat collecting box is provided with at least four groups of "membrane type" serpentine pipes.

6. A boiler heat recovery device according to claim 1, characterized in that: The outer wall of the waste heat collecting box is wrapped with thermal insulation cotton.

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