Flue gas waste heat recovery device of boiler
By setting up a combined structure of insulation shell, heat exchange components and water spray shell, the problems of insufficient waste heat recovery from flue gas and high energy consumption in treatment are solved. This achieves full recovery of waste heat from flue gas and gas scrubbing treatment, improves heat utilization efficiency and reduces energy consumption of flue gas treatment equipment.
Patent Information
- Application Number
- CN202520468478.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Existing boilers have insufficient waste heat recovery from flue gas, and the energy consumption for flue gas treatment after waste heat recovery is high, resulting in significant flue gas pollution and a lack of effective treatment capabilities.
The system adopts a combined structure of insulation shell one, heat exchange component, insulation shell two, and water spray shell. Initial heat recovery is achieved through insulation shell one, and staged heat recovery and flue gas scrubbing are carried out using heat exchange component and water spray shell, thereby reducing heat loss and lowering the energy consumption of subsequent treatment equipment.
It achieves full recovery of waste heat from flue gas and gas scrubbing treatment, improves heat utilization efficiency, reduces energy consumption of flue gas treatment equipment, and reduces flue gas pollution.
Smart Images
Figure CN223896002U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of boiler-related technology, and in particular relates to a waste heat recovery device for boiler flue gas. Background Technology
[0002] In thermal power plants, waste heat recovery from boiler flue gas can be used to heat condensate and preheat air, improving the unit's thermal efficiency, reducing coal consumption for power generation, and simultaneously reducing pollutant emissions. Recovering and utilizing waste heat from flue gas can significantly improve boiler thermal efficiency, save substantial energy, reduce heat emissions from flue gas, and lower thermal pollution levels. Furthermore, for boilers using wet desulfurization, lowering the flue gas temperature can reduce the consumption of desulfurization process water, saving water resources. However, it still has the following drawbacks in practical application:
[0003] When flue gas undergoes heat recovery, it is usually directly fed into the recovery equipment for single-step heat recovery. After the flue gas heat recovery, it is directly fed into the treatment equipment for processing. However, heat is still retained in the flue gas. The flue gas is then discharged after processing, which results in insufficient heat recovery of the flue gas.
[0004] Furthermore, after the flue gas undergoes heat recovery in the heat recovery equipment, it is directly discharged into the flue gas treatment equipment to recover heat. This results in significant flue gas pollution. The waste heat recovery equipment can only recover heat and does not have the function of treating the flue gas, requiring the flue gas treatment equipment to operate with high energy consumption. Utility Model Content
[0005] The purpose of this utility model is to provide a waste heat recovery device for boiler flue gas. By setting up an insulation shell, a heat exchange component, an insulation shell, and a water spray shell, it solves the problems of insufficient waste heat recovery and lack of processing function for flue gas during waste heat recovery.
[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0007] This utility model relates to a waste heat recovery device for boiler flue gas, comprising an insulation shell, a heat exchange assembly, a second insulation shell, and a water spray shell. The first insulation shell houses the heat exchange assembly, which includes a water delivery box, heat exchange coils, and a drain box. The water delivery box and drain box are fixed to one side wall of the first insulation shell, with the water delivery box positioned above the drain box. The side of the water delivery box and drain box away from the inner wall of the first insulation shell shares a common fixed connection with several heat exchange coils, which are equally spaced. The top of the first insulation shell... A transfer pipe is fixedly connected to one edge of the insulation shell, and a second insulation shell is fixedly connected to the end of the transfer pipe away from the first insulation shell. A water spray shell is provided in the upper part of the second insulation shell. During operation, the heat exchange component is connected to the first insulation shell, and the flue gas is initially passed through the first insulation shell. When the heat exchange component is working, the heat in the flue gas passing through the first insulation shell is recovered. The air passing through the first insulation shell is discharged through the second insulation shell, and water is sprayed into the second insulation shell through the water spray shell for further recovery of the flue gas.
[0008] Furthermore, the bottom of the insulation shell is fixedly connected to a smoke conveying pipe. The ends of the transfer pipe and the smoke conveying pipe connected to the insulation shell are staggered from each other when viewed from above. The insulation shell, the transfer pipe, and the smoke conveying pipe are all double-layered. When the insulation shell is working, the flue gas is transported into the insulation shell through the smoke conveying pipe. The double-layered structure of the insulation shell, the transfer pipe, and the smoke conveying pipe insulates the flue gas and reduces the heat loss of the flue gas.
[0009] Furthermore, the heat exchange assembly also includes a water supply pipe. The water supply box and the drain box are both fixedly connected to the center of the side away from the heat exchange coil. The water supply pipe passes through the insulation shell and extends out of the insulation shell. Water is transported into and out of the heat exchange structure of the heat exchange assembly inside the insulation shell through the water supply pipe.
[0010] Furthermore, a water collection shell is fixedly connected to the bottom of the second heat-insulating shell, and a drain pipe is fixedly connected to one side of the water collection shell. The second heat-insulating shell collects the water that has undergone heat exchange and air absorption through the water collection shell and discharges it through the drain pipe.
[0011] Furthermore, the end of the transfer pipe away from the first insulation shell is located at the lower part of the second insulation shell. The side of the second insulation shell away from the transfer pipe is fixedly connected to a smoke exhaust pipe. The height of the transfer pipe is lower than that of the water spray shell, and the height of the smoke exhaust pipe is higher than that of the water spray shell. This allows the flue gas entering the second insulation shell to be discharged through the smoke exhaust pipe after gas washing and heat exchange during operation.
[0012] Furthermore, the water spray shell has water spray holes evenly distributed around its periphery, and a conveying pipe is fixedly connected to the top of the water spray shell. The conveying pipe is fixedly connected to the top of the second insulation shell, and the water spray shell conveys water to it through the conveying pipe and sprays it out into the second insulation shell through the water spray holes.
[0013] This utility model has the following beneficial effects:
[0014] This invention solves the problem of insufficient waste heat recovery in flue gas waste heat recovery devices by setting up an insulation shell, a heat exchange component, an insulation shell, and a water spray shell. Flue gas is transported to the insulation shell through a flue pipe. After passing through the insulation shell, the flue gas is transported to a transfer pipe. As the flue gas passes through the insulation shell, water cooled by heat exchange with the external heating network is transported to a water box through a water pipe located above. From there, the water is transported to a heat exchange coil located inside the insulation shell. The heat from the flue gas in the insulation shell heats the water passing through the heat exchange coil and is then transported to the water box. After transfer through the water box, the water is transported to the external heating network's hot water heating device through a water pipe. Further heat recovery is achieved through the second insulation shell in conjunction with the water spray shell, allowing for staged and more thorough waste heat recovery.
[0015] This invention solves the problem of the lack of flue gas treatment function during waste heat recovery by setting up a second insulation shell and a water spray shell. When the flue gas is transported into the second insulation shell, the transport pipe is simultaneously transported to the water spray shell. Water is sprayed into the second insulation shell through the spray holes on the periphery of the water spray shell, washing the flue gas entering the second insulation shell. During the washing process, the heat in the flue gas is absorbed and transported to the water collection shell. It is then transported to the device for preheating the boiler air through the drain pipe for further flue gas recovery. After washing, the flue gas is discharged through the exhaust pipe to the external flue gas treatment equipment for further treatment. This allows the flue gas to undergo washing operations simultaneously during waste heat recovery, reducing the energy consumption of subsequent flue gas treatment equipment. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a three-dimensional view of the partially cut-open structure of a flue gas waste heat recovery device for a boiler.
[0018] Figure 2 A three-dimensional view of the structure of the insulation shell after a section is cut open and combined with the heat exchange components;
[0019] Figure 3 This is a three-dimensional structural view of the insulation shell.
[0020] Figure 4 This is a three-dimensional structural diagram of the heat exchange component;
[0021] Figure 5 This is a three-dimensional structural view of the second insulation shell;
[0022] Figure 6 This is a three-dimensional structural diagram of the water spray shell;
[0023] Figure 7 This is a three-dimensional view of the assembly structure of a flue gas waste heat recovery device for a boiler.
[0024] Figure label:
[0025] 1. Insulation shell one; 101. Transfer pipe; 102. Smoke conveying pipe; 2. Heat exchange assembly; 201. Water conveying box; 202. Heat exchange coil; 203. Drain box; 204. Water conveying pipe; 3. Insulation shell two; 301. Smoke exhaust pipe; 302. Water collection shell; 303. Drain pipe; 4. Water spray shell; 401. Water spray hole; 402. Conveying pipe. 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 skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1
[0027] Please see Figure 1-7This utility model is a waste heat recovery device for boiler flue gas, including an insulation shell 1, a heat exchange component 2, a second insulation shell 3, and a water spray shell 4. The heat exchange component 2 is installed inside the insulation shell 1. When the insulation shell 1 is working, the flue gas initially passes through it, initially heating the water passing through the heat exchange component 2 and initially recovering the heat from the flue gas. The heat exchange component 2 initially recovers the heat from the flue gas passing through the insulation shell. The heat exchange component 2 includes a water delivery box 201, a heat exchange coil 202, and a drain box 203. The water delivery box 201 and the drain box 203 are fixed to one side wall inside the insulation shell 1. The water delivery box 201 is positioned above the drain box 203, and water is transported through the water delivery box 201 and the drain box 203 through the heat exchange coil 202. The water delivery box 201 and the drain box 203 are located away from the fixed... Several heat exchange coils 202 are fixedly connected to one side of the inner wall of the insulation shell 1. The heat exchange coils 202 are evenly spaced. When hot water passes through the heat exchange coils 202, the heat of the flue gas passing through the insulation shell 1 is transferred to the water passing through it. A transfer pipe 101 is fixedly connected to one edge of the top of the insulation shell 1. The flue gas in the insulation shell 1 is transferred to the insulation shell 2 3 through the transfer pipe 101. The end of the transfer pipe 101 away from the insulation shell 1 is fixedly connected to the insulation shell 2 3. A water spray shell 4 is provided in the upper part of the insulation shell 2 3. After the flue gas enters the insulation shell 2 3, the water entering it is sprayed out in the insulation shell 2 3 through the water spray shell 4, so that the flue gas passing through the insulation shell 2 3 is scrubbed and the heat in the flue gas is further absorbed.
[0028] Specifically, the bottom of the insulation shell 1 is fixedly connected to a flue gas pipe 102. The ends of the transfer pipe 101 and the flue gas pipe 102 connected to the insulation shell 1 are staggered from each other when viewed from above. The insulation shell 1, the transfer pipe 101 and the flue gas pipe 102 are all double-layered. The insulation shell 1, the transfer pipe 101 and the flue gas pipe 102 are all made of insulation material. The bottom end of the flue gas pipe 102 is connected to the pipeline that transports the flue gas discharged from the boiler, and transports the flue gas into the insulation shell 1. The double-layered structure of the insulation shell 1, the transfer pipe 101 and the flue gas pipe 102 reduces the heat loss generated when the flue gas passes through. The staggered arrangement of the transfer pipe 101 and the flue gas pipe 102 increases the path that the flue gas takes through the insulation shell 1.
[0029] Furthermore, the heat exchange assembly 2 also includes a water supply pipe 204. The water supply box 201 and the drain box 203 are both fixedly connected to the center of the side away from the heat exchange coil 202 by the water supply pipe 204. The water supply pipe 204 passes through the insulation shell 1 and extends out of the insulation shell 1. The upper water supply pipe 204 is connected to the cold water end after heat exchange with the external heat network, and the lower water supply pipe 204 is connected to the pipeline before heating with the external heat network. When the heat exchange assembly 2 is working, the water cooled after heat exchange in the external heat network is transported to the water supply box 201 through the upper water supply pipe 204, and the hot water after heat exchange is transported to the external heat network heating equipment through the lower water supply pipe 204.
[0030] The operation process of this embodiment is as follows: During operation, flue gas is transported to the insulation shell 1 through the flue gas pipe 102. After passing through the insulation shell 1, the flue gas is transported to the transfer pipe 101. When the flue gas passes through the insulation shell 1, the water cooled after heat exchange with the external heat network is transported to the water box 201 through the water pipe 204 located above. Then, the water is transported to the heat exchange coil 202 through the water box 201. The heat exchange coil 202 is set in the insulation shell 1. The heat of the flue gas in the insulation shell 1 heats the water passing through the heat exchange coil 202 and is transported to the water box 201. After being transferred through the water box 201, the water is transported to the heating device of the external heat network hot water through the water pipe 204. Specific Implementation Example 2
[0031] Please see Figure 1 , 2 5, 6. Based on the specific embodiment one, the bottom of the insulation shell 2 3 is fixedly connected to a water collection shell 302, and a drain pipe 303 is fixedly connected to one side of the water collection shell 302. The end of the drain pipe 303 away from the water collection shell 302 is connected to the equipment for preheating the boiler intake air. The insulation shell 2 3 transports the water in the water collection shell 302 that washes the flue gas and absorbs the heat of the flue gas to the drain pipe 303 through the water collection shell 302. The hot water in the water collection shell 302 is then transported to the boiler intake air preheating equipment through the drain pipe 303.
[0032] Specifically, the end of the transfer pipe 101 away from the insulation shell 1 is located at the lower part of the side of the insulation shell 3. The side of the insulation shell 3 away from the transfer pipe 101 is fixedly connected to the exhaust pipe 301. The end of the exhaust pipe 301 away from the insulation shell 3 is connected to the equipment for further flue gas treatment. The height of the transfer pipe 101 is lower than that of the water spray shell 4, and the height of the exhaust pipe 301 is higher than that of the water spray shell 4. The flue gas that has been scrubbed in the insulation shell 3 is transported to the equipment for further flue gas treatment through the exhaust pipe 301.
[0033] Furthermore, spray holes 401 are evenly distributed around the periphery of the water spray shell 4, and a conveying pipe 402 is fixedly connected to the top of the water spray shell 4. The conveying pipe 402 is fixedly connected to the top of the insulation shell 3. The top of the conveying pipe 402 is connected to the equipment for conveying flue gas scrubbing gas. Water is conveyed to the water spray shell 4 through the conveying pipe 402, and then conveyed to the spray holes 401 through the water spray shell 4. The water is then sprayed into the insulation shell 3 through the spray holes 401, scrubbing the flue gas that has passed through the insulation shell 3, and further recovering the heat in the flue gas.
[0034] The operation process of this embodiment is as follows: During operation, when the flue gas is transported into the insulation shell 3, the transport pipe 402 is simultaneously transported to the water spray shell 4. The water is sprayed into the insulation shell 3 through the water spray holes 401 on the periphery of the water spray shell 4, and the flue gas entering the insulation shell 3 is scrubbed. During the scrubbing process, the heat in the flue gas is absorbed and transported to the water collection shell 302. The water is then transported to the device for preheating the air entering the boiler through the drain pipe 303 to further recover the flue gas. After scrubbing the flue gas, the flue gas is discharged to the external flue gas treatment equipment through the exhaust pipe 301 for further treatment.
[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A waste heat recovery device for boiler flue gas, comprising an insulation shell (1), a heat exchange assembly (2), an insulation shell (3), and a water spray shell (4), characterized in that: The heat exchange assembly (2) is provided inside the insulation shell (1). The heat exchange assembly (2) includes a water supply box (201), a heat exchange coil (202), and a drain box (203). The water supply box (201) and the drain box (203) are fixed on one side wall inside the insulation shell (1). The water supply box (201) is located above the drain box (203). The water supply box (201) and the drain box (203) are fixedly connected to a number of heat exchange coils (202) on the side away from the inner wall of the insulation shell (1). The heat exchange coils (202) are spaced equally apart. A transfer pipe (101) is fixedly connected to one edge of the top of the insulation shell (1). The end of the transfer pipe (101) away from the insulation shell (1) is fixedly connected to the second insulation shell (3). A water spray shell (4) is provided in the upper part of the second insulation shell (3).
2. The flue gas waste heat recovery device for a boiler according to claim 1, characterized in that: The bottom of the insulation shell (1) is fixedly connected to a smoke conveying pipe (102). The ends of the transfer pipe (101) and the smoke conveying pipe (102) connected to the insulation shell (1) are staggered from each other when viewed from above. The insulation shell (1), the transfer pipe (101) and the smoke conveying pipe (102) are all double-layered.
3. The flue gas waste heat recovery device for a boiler according to claim 1, characterized in that: The heat exchange assembly (2) also includes a water supply pipe (204). The water supply box (201) and the drain box (203) are both fixedly connected to the center of the side away from the heat exchange coil (202) by the water supply pipe (204). The water supply pipe (204) passes through the insulation shell (1) and extends out of the insulation shell (1).
4. The flue gas waste heat recovery device for a boiler according to claim 1, characterized in that: The bottom of the second heat-insulating shell (3) is fixedly connected to a water collection shell (302), and a drain pipe (303) is fixedly connected to one side of the water collection shell (302).
5. The flue gas waste heat recovery device for a boiler according to claim 4, characterized in that: The transfer pipe (101) is located at the lower part of the side of the insulation shell (1) away from the insulation shell (2). The side of the insulation shell (3) away from the transfer pipe (101) is fixedly connected to the exhaust pipe (301). The height of the transfer pipe (101) is lower than that of the water spray shell (4), and the height of the exhaust pipe (301) is higher than that of the water spray shell (4).
6. The flue gas waste heat recovery device for a boiler according to claim 1, characterized in that: The spray shell (4) has spray holes (401) evenly distributed around its periphery. The top of the spray shell (4) is fixedly connected to a conveying pipe (402), which is fixedly connected to the top of the insulation shell (3).