Waste heat recovery device for industrial boiler

Abstract

The utility model discloses a waste heat recovery device for an industrial boiler, which belongs to the technical field of waste heat recovery devices for industrial boilers, and comprises a bottom plate, the top of the bottom plate is fixedly connected with a boiler body, the top of the bottom plate is fixedly connected with a waste heat recovery component, and the top of the boiler body is bolted with a water outlet pipe. A water inlet pipe is connected to the rear side of the waste heat recovery assembly in a bolted mode. The waste heat recovery assembly comprises a box body, the top of the box body communicates with a communicating pipe, and the side, away from the box body, of the communicating pipe communicates with the waste heat recovery assembly. The problems that water in the water inlet pipe of the boiler cannot be directly preheated due to the fact that the water is not directly associated with the water inlet pipe of the boiler, and waste heat recovery is inconvenient to fully play to improve the overall energy utilization efficiency of the boiler are solved.

Description

Technical Field

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

[0002] Industrial boilers are divided into two types: one is steam, which is used for power generation or gas supply. For example, fertilizer plants can use steam to vaporize coal to synthesize fertilizer. This is a typical industrial boiler. Most industrial boilers are coal-fired. Gas-fired boilers are generally waste heat boilers used to recover waste heat. The most common type of industrial boiler is the circulating fluidized bed boiler. Industrial boilers are important thermal power equipment.

[0003] Existing industrial boilers generate a large amount of high-temperature flue gas during operation. This flue gas is usually directly discharged into the air, which easily leads to energy waste. In addition, this flue gas contains dust and other particles, which will pollute the environment and affect air quality if released directly into the air. Therefore, it is necessary to develop a waste heat recovery device for industrial boilers.

[0004] The existing patent (publication number: CN214470132U) discloses a utility model belonging to the field of waste heat recovery device technology, specifically a waste heat recovery device for industrial boilers. It includes a mounting frame, a moving component including rollers and a push rod, a waste heat utilization component on the inner wall of the mounting frame including a connecting seat, a curved hot water suction pipe, and a vacuum pump, a filter component on the inner wall of the mounting frame, and an insulation layer snapped into the mounting frame. The rollers, in conjunction with external force, move the waste heat recovery device. During combustion, the industrial boiler generates high-temperature flue gas, which is input into the mounting frame through the inlet pipe. The flue gas flows downward along the curved hot water suction pipe. When the flue gas reaches the bottom of the mounting frame, the vacuum pump discharges the used flue gas from the mounting frame. The activated carbon adsorption layer and sodium hydroxide adsorption layer filter dust particles and acidic gases contained in the flue gas. The insulation layer keeps the interior of the mounting frame warm.

[0005] To address the aforementioned issues, existing patents offer solutions. In most existing boiler waste heat recovery devices, the curved hot water suction pipe absorbs waste heat from the flue gas. However, this only uses the waste heat to heat the water in the curved hot water suction pipe and is not directly connected to the boiler inlet pipe. This means that the water in the boiler inlet pipe cannot be preheated directly, which hinders the full realization of the improvement in the overall energy utilization efficiency of the boiler through waste heat recovery.

[0006] Therefore, a waste heat recovery device for industrial boilers is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a waste heat recovery device for industrial boilers, which can solve the problem that most existing boiler waste heat recovery devices use curved hot water pipes to absorb waste heat from flue gas, but only use the waste heat from flue gas to heat the water in the curved hot water pipes. This is not directly connected to the boiler inlet pipe, which means that the water in the boiler inlet pipe cannot be preheated directly, and it is not convenient to fully utilize the improvement of the overall energy utilization efficiency of the boiler by waste heat recovery.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a waste heat recovery device for an industrial boiler, comprising a base plate, a boiler body fixedly connected to the top of the base plate, a waste heat recovery component fixedly connected to the top of the base plate, an outlet pipe bolted to the top of the boiler body, and an inlet pipe bolted to the rear side of the waste heat recovery component.

[0009] The waste heat recovery assembly includes a housing, with a connecting pipe at the top of the housing. The side of the connecting pipe away from the housing is connected to the waste heat recovery assembly. A protective cover is connected to the top of the inner wall of the housing. A spiral plate is fixedly connected inside the protective cover. An activated carbon adsorption plate is snapped into the inside of the mounting frame. A connecting pipe is installed inside the housing. An air intake pump is connected to the front of the housing. The rear side of the connecting pipe is bolted to a water inlet pipe. The side of the connecting pipe away from the water inlet pipe is bolted to the boiler body. A flue gas pipe is connected to the right side of the housing.

[0010] Preferably, a protective sleeve is fitted over the surface of the boiler body, and a cavity is formed inside the protective sleeve. An electronic valve is connected to the front side of the cavity, and a circular pipe is connected to the rear side of the cavity. The side of the circular pipe away from the cavity is connected to the interior of the housing.

[0011] Preferably, a baffle is fixedly connected inside the cavity, and the surface of the baffle has a plurality of holes.

[0012] Preferably, a stainless steel fan body is fixedly connected inside the circular tube.

[0013] Preferably, the top of the exhaust pipe is provided with a top plate, and two filter screens are fixedly connected to the bottom of the top plate. The top of the exhaust pipe is provided with a slot for cooperating with the two filter screens.

[0014] Preferably, a sealing sleeve is snapped into the inside of the exhaust pipe, and a pull-out block is fixedly connected to the right side of the sealing sleeve.

[0015] Preferably, a square hole is provided on the right side of the box body, and sliding grooves are provided at the top and bottom of the inner wall of the square hole. Sliding blocks are slidably connected inside the two sliding grooves, and protective plates are fixedly connected to the opposite side of the two sliding blocks.

[0016] Preferably, a control block is fixedly connected to the right side of the protective plate, and a protective pad is fixedly connected to the rear side of the control block.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In this application, the preheated liquid enters the boiler body through the connection channel between the connecting pipe and the boiler body, which reduces the energy required for the boiler to heat water and improves energy utilization efficiency.

[0019] 2. In this application, when the boiler is running, the high-temperature gas inside the box enters the protective sleeve cavity through the circular pipe under the action of the stainless steel fan body. This allows the heat that might otherwise be lost to be recycled between the protective sleeve and the boiler body, further improving the waste heat recovery efficiency. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the waste heat recovery device for industrial boilers according to this utility model;

[0021] Figure 2 This is a schematic diagram of the waste heat recovery component of this utility model;

[0022] Figure 3 This is a cross-sectional view of the protective sleeve of this utility model;

[0023] Figure 4 This is a schematic diagram showing the disassembled components of this utility model;

[0024] Figure 5 This is a schematic diagram showing the disassembled square hole and protective plate of this utility model.

[0025] In the diagram, 1. Base plate; 2. Boiler body; 3. Waste heat recovery assembly; 301. Box; 302. Connecting pipe; 303. Protective cover; 304. Spiral plate; 305. Mounting bracket; 306. Activated carbon adsorption plate; 307. Connecting pipe; 308. Suction pump; 309. Exhaust pipe; 4. Water outlet pipe; 5. Water inlet pipe; 6. Protective sleeve; 7. Cavity; 8. Electronic valve; 9. Circular pipe; 10. Baffle; 11. Hole; 12. Stainless steel fan body; 13. Top plate; 14. Filter screen; 15. Slot; 16. Sealing sleeve; 17. Pull-out block; 18. Square hole; 19. Sliding groove; 20. Sliding block; 21. Protective plate; 22. Control block; 23. Protective pad. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 The present invention provides the following technical solution:

[0028] An industrial boiler waste heat recovery device includes a base plate 1, a boiler body 2 fixedly connected to the top of the base plate 1, a waste heat recovery component 3 fixedly connected to the top of the base plate 1, a water outlet pipe 4 bolted to the top of the boiler body 2, and a water inlet pipe 5 bolted to the rear side of the waste heat recovery component 3.

[0029] The waste heat recovery assembly 3 includes a housing 301. A connecting pipe 302 is connected to the top of the housing 301. The side of the connecting pipe 302 away from the housing 301 is connected to the waste heat recovery assembly 3. A protective cover 303 is connected to the top of the inner wall of the housing 301. A spiral plate 304 is fixedly connected inside the protective cover 303. An installation frame 305 is fixedly connected inside the housing 301. An activated carbon adsorption plate 306 is snapped into the inside of the installation frame 305. A connecting pipe 307 is provided inside the housing 301. An air suction pump 308 is connected to the front of the housing 301. The rear side of the connecting pipe 307 is bolted to the water inlet pipe 5. The side of the connecting pipe 307 away from the water inlet pipe 5 is bolted to the boiler body 2. A flue pipe 309 is connected to the right side of the housing 301.

[0030] In this embodiment: a base plate 1 is provided to support the boiler body 2 and the waste heat recovery component 3. The waste heat recovery component 3 can recover the high-temperature flue gas discharged from the boiler body 2. Then, the liquid that needs to enter the boiler body 2 is preheated. The liquid after heat exchange is discharged from the boiler body 2 through the outlet pipe 4. The liquid is added to the interior of the waste heat recovery component 3 through the inlet pipe 5. The component includes a housing 301, a connecting pipe 302, a protective cover 303, a spiral plate 304, a mounting frame 305, an activated carbon adsorption plate 306, and a connecting pipe 307. 07. Suction pump 308 and flue pipe 309: After the boiler body 2 starts operating, high-temperature flue gas is generated. At this time, the suction pump 308 starts. Under the suction of the suction pump 308, the high-temperature flue gas is transported to the inside of the housing 301 through the connecting pipe 302. The connecting pipe 302 serves as a channel for flue gas transmission, smoothly introducing the flue gas generated by the boiler body 2 into the structure for treatment. The high-temperature flue gas entering the housing 301 first reaches the protective cover 303. The protective cover 303 protects the flue gas, preventing it from directly impacting other components. The spiral plate 304 inside the protective cover 303 begins to function. The flue gas flows along the spiral plate 304. The special structure of the spiral plate 304 increases the flow path and time of the flue gas, allowing it to exchange heat more fully with the surrounding environment, thereby reducing the temperature of the flue gas. The activated carbon adsorption plate 306 inside the mounting frame 305 purifies the flue gas. The activated carbon adsorption plate 306 has a rich pore structure and strong adsorption capacity, which can adsorb dust particles, harmful gases and other impurities in the flue gas, reducing pollutant emissions and making the discharged flue gas cleaner and more environmentally friendly. At the same time, the water inlet pipe 5 delivers liquid to the inside of the connecting pipe 307. 307 is installed inside the housing 301, and its pipe wall is in full contact with the flue gas inside the housing 301. As the flue gas temperature decreases, heat is transferred to the liquid inside the connecting pipe 307, achieving preheating treatment of the liquid. The preheated liquid inside the pipe moves smoothly into the boiler body 2 through the connection channel between the connecting pipe 307 and the boiler body 2. This preheated liquid can reduce the energy required for the boiler body 2 to heat water, improve the energy utilization efficiency of the boiler body 2, and reduce fuel consumption. The flue gas, after waste heat exchange and purification treatment, is discharged from the housing 301 through the exhaust pipe 309.

[0031] Specifically, such as Figure 3 As shown, a protective sleeve 6 is fitted on the surface of the boiler body 2, and a cavity 7 is opened inside the protective sleeve 6. An electronic valve 8 is connected to the front side of the cavity 7, and a circular pipe 9 is connected to the rear side of the cavity 7. The side of the circular pipe 9 away from the cavity 7 is connected to the interior of the housing 301.

[0032] Specifically, such as Figure 3 As shown, a baffle 10 is fixedly connected inside the cavity 7, and the surface of the baffle 10 has a plurality of holes 11.

[0033] Specifically, such as Figure 3 As shown, a stainless steel fan body 12 is fixedly connected inside the circular tube 9.

[0034] In this embodiment: by setting up a protective sleeve 6, a cavity 7, an electronic valve 8, a circular pipe 9, a baffle 10, several holes 11, and a stainless steel fan body 12, when the boiler body 2 starts operating, high-temperature flue gas is generated and enters the housing 301 of the waste heat recovery component 3. At this time, the stainless steel fan body 12 is activated, which generates suction, causing the high-temperature gas inside the housing 301 to flow through the circular pipe 9 to the cavity 7 of the protective sleeve 6. During the gas flow, the circular pipe 9 acts as a conveying channel, smoothly introducing the high-temperature gas. After the high-temperature gas enters the cavity 7 of the protective sleeve 6, it passes through the baffle 10 with several holes 11. The baffle 10 disperses and buffers the gas, making the gas flow evenly in the cavity 7, preventing the gas from concentrating and impacting a certain point, and allowing the gas to contact the protective sleeve 6 more fully. The protective sleeve 6 then contacts the boiler body 2. The heat from the high-temperature gas is transferred to the boiler body 2, realizing heat recovery and utilization. At the same time, because the gas is dispersed, the contact area and time between the gas and the protective sleeve 6 are increased, improving the heat exchange efficiency. As time goes by, the gas temperature in the cavity 7 of the protective sleeve 6 gradually rises. After reaching a certain level, it needs to be discharged to maintain the stable operation of the device. At this time, the electronic valve 8 is opened, and the gas in the cavity 7 is discharged under the action of pressure difference. When the boiler body 2 stops running, the waste heat recovery component 3 also stops working. First, the stainless steel fan body 12 is turned off to stop introducing the high-temperature gas inside the box 301 into the cavity 7 of the protective sleeve 6. Then, the electronic valve 8 is turned off to prevent outside air from entering the cavity 7 and to avoid the high-temperature gas remaining in the cavity 7 from affecting the surrounding environment. At this time, the entire device enters the stop state and waits for the next start-up.

[0035] Specifically, such as Figure 4 As shown, the top of the exhaust pipe 309 is provided with a top plate 13, and two filter screens 14 are fixedly connected to the bottom of the top plate 13. The top of the exhaust pipe 309 is provided with a slot 15 for use with the two filter screens 14.

[0036] Specifically, such as Figure 1 , Figure 4 As shown, a sealing sleeve 16 is snapped into the inside of the exhaust pipe 309, and a pull block 17 is fixedly connected to the right side of the sealing sleeve 16.

[0037] In this embodiment: by setting a top plate 13, two filter screens 14 and two slots 15, the two filter screens 14 are respectively spliced ​​to the exhaust pipe 309 by the two slots 15, and the top plate 13 is in contact with the top of the exhaust pipe 309 to support the two filter screens 14, so as to facilitate the user to disassemble and maintain the two filter screens 14. By setting a sealing sleeve 16 and a pull block 17, the sealing block seals the exhaust pipe 309, and the pull block 17 facilitates the user to disassemble the sealing sleeve 16 on the inner wall of the exhaust pipe 309.

[0038] Specifically, such as Figure 5 As shown, a square hole 18 is provided on the right side of the box 301. Sliding grooves 19 are provided at the top and bottom of the inner wall of the square hole 18. Sliding blocks 20 are slidably connected inside the two sliding grooves 19. Protective plates 21 are fixedly connected to the opposite side of the two sliding blocks 20.

[0039] Specifically, such as Figure 5 As shown, a control block 22 is fixedly connected to the right side of the protective plate 21, and a protective pad 23 is fixedly connected to the rear side of the control block 22.

[0040] In this embodiment: by setting a square hole 18, a sliding groove 19, a sliding block 20, and a protective plate 21, the sliding block 20 contacts the inner wall of the sliding groove 19, and the protective plate 21 engages with the inner wall of the square hole 18. The protective plate 21 blocks the right side of the box 301. By adjusting the protective plate 21, the user can replace and maintain the activated carbon adsorption plate 306 inside the box 301 through the square hole 18. The activated carbon adsorption plate 306 should be replaced and maintained after a certain period of use. By setting a control block 22 and a protective pad 23, the protective plate 21 can be adjusted by setting the control block 22, and the protective pad 23 makes it easy for the user to adjust the control block 22.

[0041] Working principle: The industrial boiler generates high-temperature flue gas during operation. The suction pump 308 starts, and under the action of suction, the high-temperature flue gas enters the housing 301 through the connecting pipe 302. The protective cover 303 connected to the top of the inner wall of the housing 301 can prevent the flue gas from directly impacting other components. The internal spiral plate 304 makes the flue gas flow path longer and the time longer, allowing for sufficient heat exchange with the surrounding environment and slowing down the flue gas temperature. At this time, the water inlet pipe 5 delivers liquid to the connecting pipe 307 located inside the housing 301. During the flue gas cooling process, heat is transferred to the liquid in the connecting pipe 307, realizing the preheating treatment of the liquid. The preheated liquid enters the boiler body 2 through the connection channel between the connecting pipe 307 and the boiler body 2, reducing the energy required for the boiler body 2 to heat water and improving energy utilization efficiency.

[0042] The above are merely preferred embodiments of the present utility model and are 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 waste heat recovery device for industrial boilers, comprising a base plate (1), characterized in that: The top of the bottom plate (1) is fixedly connected with a boiler body (2), the top of the bottom plate (1) is fixedly connected with a waste heat recovery assembly (3), the top of the boiler body (2) is hingedly connected with a water outlet pipe (4), and the rear side of the waste heat recovery assembly (3) is hingedly connected with a water inlet pipe (5); The waste heat recovery assembly (3) comprises a box body (301), the top of the box body (301) is communicated with a communication pipe (302), one side of the communication pipe (302) away from the box body (301) is communicated with the waste heat recovery assembly (3), the top of the inner wall of the box body (301) is communicated with a protective cover (303), the inside of the protective cover (303) is fixedly connected with a spiral plate (304), the inside of the box body (301) is fixedly connected with a mounting rack (305), the inside of the mounting rack (305) is clamped with an activated carbon adsorption plate (306), the inside of the box body (301) is provided with a connecting pipe (307), the front side of the box body (301) is communicated with a suction pump (308), the rear side of the connecting pipe (307) is hingedly connected with the water inlet pipe (5), one side of the connecting pipe (307) away from the water inlet pipe (5) is hingedly connected with the boiler body (2), and the right side of the box body (301) is communicated with a smoke exhaust pipe (309).

2. A waste heat recovery device for an industrial boiler according to claim 1, characterized in that: The surface of the boiler body (2) is provided with a protective sleeve (6), the inside of the protective sleeve (6) is provided with a cavity (7), the front side of the cavity (7) is communicated with an electronic valve (8), the rear side of the cavity (7) is communicated with a circular pipe (9), and one side of the circular pipe (9) away from the cavity (7) is communicated with the inside of the box body (301).

3. A waste heat recovery device for an industrial boiler according to claim 2, characterized in that: The inside of the cavity (7) is fixedly connected with a baffle (10), and a plurality of holes (11) are formed in the surface of the baffle (10).

4. A waste heat recovery device for an industrial boiler according to claim 2, characterized in that: The inside of the circular pipe (9) is fixedly connected with a stainless steel fan body (12).

5. A waste heat recovery device for industrial boilers as claimed in claim 1, wherein: The top of the smoke exhaust pipe (309) is provided with a top plate (13), the bottom of the top plate (13) is fixedly connected with two filter screens (14), and the top of the smoke exhaust pipe (309) is provided with clamping grooves (15) matched with the two filter screens (14).

6. A waste heat recovery device for industrial boilers according to claim 1, characterized in that: The inside of the smoke exhaust pipe (309) is clamped with a sealing sleeve (16), and the right side of the sealing sleeve (16) is fixedly connected with a pulling block (17).

7. A waste heat recovery device for industrial boilers as claimed in claim 1, wherein: The right side of the box body (301) is provided with a square hole (18), the top and bottom of the inner wall of the square hole (18) are provided with sliding grooves (19), the inside of the two sliding grooves (19) are slidably connected with sliding blocks (20), and the opposite sides of the two sliding blocks (20) are fixedly connected with protective plates (21).

8. A waste heat recovery device for an industrial boiler according to claim 7, characterized in that: The right side of the protective plate (21) is fixedly connected with a control block (22), and the rear side of the control block (22) is fixedly connected with a protective pad (23). The right side of the protective plate (21) is fixedly connected with a control block (22), and the rear side of the control block (22) is fixedly connected with a protective pad (23).

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