Boiler flue waste heat recovery device
The modularly designed boiler flue waste heat recovery device enables segmented heat recovery in high-temperature and medium-low temperature sections, solving the problems of difficult disassembly and low heat recovery efficiency of existing devices, and improving heat utilization and equipment maintenance convenience.
Patent Information
- Application Number
- CN202520354069.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Existing boiler flue gas recovery devices are difficult to disassemble and clean, have low heat recovery efficiency, especially for medium and low temperature waste heat, and the particulate matter in the flue gas can easily clog the pipes and corrode the equipment.
The first and second recovery components, which adopt a modular design, are used for heat recovery in the high-temperature and medium-low-temperature ranges, respectively. Combined with circulating water pipes and hot water suction pipes, they achieve segmented heat capture and filter particulate matter through a screen. The device is detachable for easy cleaning.
It improves heat recovery efficiency, extends maintenance cycles, reduces fuel consumption and CO2 emissions, reduces equipment corrosion and clogging, and lowers overall investment and maintenance costs.
Smart Images
Figure CN223869231U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of boiler flue gas recovery technology, specifically to a boiler flue waste heat recovery device. Background Technology
[0002] In industrial production, boilers, as core thermal equipment, emit high-temperature flue gas containing a large amount of waste heat. Traditional boiler flue heat recovery devices generally adopt a single heat exchange structure, such as fixed heat exchange tubes or plate heat exchangers. Although they can achieve partial heat recovery, they have significant drawbacks.
[0003] The heat exchange components in existing equipment are mostly welded or bolted, making disassembly and cleaning difficult. After long-term operation, dust accumulates on the outer walls of the pipes, increasing thermal resistance and requiring frequent shutdowns for cleaning, affecting production continuity. Furthermore, a single component cannot fully absorb the multi-stage heat from the flue gas, especially the utilization rate of medium- and low-temperature waste heat, resulting in an overall thermal efficiency typically below 50%. In addition, fly ash and sulfide particles carried in the flue gas directly enter the heat exchange unit, not only exacerbating pipe corrosion but also clogging the flue gas flow channels. Although some units have added filters, these are mostly single-layer structures and cannot effectively intercept particles of different sizes. Utility Model Content
[0004] The present invention aims to provide a solution to the problem that the recycling components of existing boiler flue gas recovery devices are inconvenient to disassemble and clean.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a boiler flue waste heat recovery device, including a support frame, a recovery box, a boiler, a first recovery component and a second recovery component. The recovery box is connected to the top of the support frame, and a chimney is connected to the top of the recovery box. The boiler is connected to the bottom of the support frame through a flue. The first recovery component and the second recovery component are detachably connected inside the recovery box. The first recovery component and the second recovery component are used to recover the heat of the flue gas in the boiler.
[0006] The working principle of this utility model is as follows: The high-temperature flue gas generated by the boiler enters the bottom of the support frame through the flue and rises vertically to the recovery box under negative pressure. The circulating water pipe embedded in the groove of the recovery plate is connected to the external circulating water tank. The water pump drives the water flow to circulate in the pipe. The flue gas and the surface of the circulating water pipe are in full contact. The high-temperature heat is conducted to the water flow through the pipe wall to achieve the initial heat recovery. After the initial cooling, the flue gas flows upward and exchanges heat with the surface of the hot water pipe for a second time, further recovering the medium and low temperature waste heat, which reduces the temperature of the flue gas.
[0007] The beneficial effects of this utility model are as follows: 1. The first recovery component targets the high-temperature range, and the second component targets the medium- and low-temperature range, achieving segmented heat capture and avoiding "high quality, low utilization". 2. The recovery box and recovery components of this utility model, as well as the various parts within the recovery components, can be disassembled and cleaned without special tools, extending the maintenance cycle. 3. The hot water suction pipe preheats the boiler inlet water, reducing fuel consumption and CO2 emissions. 4. Due to the modular composition of the equipment, it can be combined into a suitable waste heat recovery device according to the boiler's waste heat emission requirements, environmental protection requirements, and heat recovery requirements. 5. The modular design facilitates disassembly, assembly, and maintenance, reducing overall investment and replacement costs. Disassembly and cleaning are convenient, and the recovery efficiency remains as high as before after cleaning, maintaining high-efficiency waste heat recovery over the long term.
[0008] Furthermore, the first recycling component includes a recycling rack and multiple circulating water pipes. The recycling rack includes a retaining plate and a recycling plate, with the recycling plate connected to the side wall of the retaining plate. The recycling plate has a hollow center and multiple grooves on opposite sides. The multiple circulating water pipes are connected to these grooves. One end of each circulating water pipe passes through the recycling box and connects to the circulation inlet of an external circulating insulated water tank. The other end of each circulating water pipe connects to the circulation outlet of the external insulated water tank, and a circulating water pump is connected to the joint between the multiple circulating water pipes and the external insulated water tank. The arrangement of the recycling plate and circulating water pipes ensures that when boiler flue gas re-enters the recycling box, it is immediately heated by the circulating water pipes. During equipment cleaning, the circulating water pipes can be removed from the recycling plate for segmented cleaning and maintenance, facilitating the cleaning and maintenance of the device.
[0009] Furthermore, the second recovery component includes a recovery rack and a hot water suction pipe. The hot water suction pipe is coiled in a curved shape around a groove in the recovery rack. One end of the hot water suction pipe is connected to a tap water pipe, and the other end is connected to an insulated water tank. Through the arrangement of the recovery plate and the hot water suction pipe, the waste heat from the boiler flue gas can be further recovered and utilized after passing through the first recovery component.
[0010] Furthermore, the first recovery component is located at the bottom of the second recovery component. This positioning of the first and second recovery components maximizes the efficiency of flue gas waste heat recovery.
[0011] Furthermore, a screening block is connected between the first and second recovery components, with a screen in the middle of the screening block. The screen allows fine particles mixed in with the boiler flue gas to be filtered out.
[0012] Furthermore, a limiting frame is connected to the top of the recycling bin, and the chimney is connected to the center of the limiting frame. The limiting frame ensures the chimney's position is fixed, preventing it from shaking due to impact when large amounts of hot gas are emitted. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the recovery box in a boiler flue waste heat recovery device according to the present invention.
[0014] Figure 2 This is a schematic diagram of the structure of a boiler flue waste heat recovery device according to the present invention;
[0015] Figure 3 for Figure 1 A schematic diagram of the structure of the recycling rack;
[0016] Figure 4 for Figure 2 Side view;
[0017] Figure 5 for Figure 1 A top view of the filter block. Detailed Implementation
[0018] The following detailed description illustrates the specific implementation method:
[0019] The reference numerals in the accompanying drawings include: chimney 1, limit frame 2, recycling box 3, screening block 4, screen 401, recycling rack 5, recycling plate 501, groove 502, clamping plate 503, handle 504, support frame 6, flue 7, boiler 8.
[0020] The basic implementation examples are as follows: Figure 1 - Appendix Figure 4As shown: A boiler flue waste heat recovery device includes a support frame 6, a recovery box 3, a boiler 8, a first recovery component, and a second recovery component. The recovery box 3 is fixedly connected to the top of the support frame 6, and a limiting frame 2 is fixedly connected to the top of the recovery box 3. Drainage ditches are provided around the inner bottom of the recovery box 3, with one side of the drainage ditch connecting to the outside. A chimney 1 is connected to the top of the recovery box 3, and the chimney 1 is located at the center of the limiting frame 2. The boiler 8 is fixedly connected to the bottom of the support frame 6 through a flue 7. There are two first recovery components and two second recovery components, with two first recovery components located at the bottom of two second recovery components. A screening block 4 is slidably connected between the two first recovery components and the two second recovery components. The screening block 4 has a screen 401 in the middle. The first recovery component includes a recovery frame 5 and a circulating water pipe. The recovery frame 5 includes a clamping mechanism. The recycling plate 503 and the recycling plate 501 are fixedly connected to the middle of the left side wall of the card plate 503. A handle 504 is fixedly connected to the middle of the right side wall of the card plate 501. The middle of the recycling plate 501 is hollowed out. Symmetrical grooves 502 are provided on both the left and right sides of the recycling plate 501. The circulating water pipe is slidably connected in the corresponding grooves 502. One end of the circulating water pipe passes through the recycling box 3 and is connected to the circulation inlet of the external insulated water tank. The other end of the circulating water pipe is connected to the circulation outlet of the external insulated water tank. A circulating water pump is fixedly connected to the joint between the circulating water pipe and the external insulated water tank. The second recycling component includes a recycling rack 5 and a hot water suction pipe. The hot water suction pipe is curved and slidably coiled around the groove 502 of the recycling rack 5. One end of the hot water suction pipe is fixedly connected to a tap water pipe. The other end of the hot water suction pipe is connected to the insulated water tank.
[0021] The specific implementation process is as follows: the flue gas generated by boiler 8 enters the bottom of support frame 6 through flue 7, and then rises into recovery box 3. The flue gas first passes through the first recovery component, whose circulating water pipe is embedded in the groove 502 of the recovery plate 501. Driven by an external insulated water tank and a circulating water pump, the water flow quickly absorbs the high-temperature heat in the flue gas, achieving initial heat energy recovery. Subsequently, the flue gas flows upward and passes through the screen 401 of the screening block 4, filtering out fine particles to prevent clogging of subsequent components. The filtered flue gas enters the second recovery component, where the curved and coiled hot water suction pipe fully contacts the flue gas to further absorb residual heat. One end of the hot water suction pipe is connected to a tap water pipe, and the other end delivers preheated water to the insulated water tank. The insulated water tank maintains the input water at a certain temperature. When the boiler 8 needs to work again, the insulated water tank delivers water to the boiler 8, reducing the heating energy consumption of the boiler 8. The first recovery component is located below the second recovery component, forming a stepped heat recovery structure to ensure that the flue gas is cooled down step by step, maximizing the heat utilization rate. The limiting bracket 2 at the top of the recovery box 3 fixes the position of the chimney 1 to ensure stable exhaust and reduce the impact of airflow on the equipment.
[0022] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A waste heat recovery device for boiler flue gas, characterized in that: The system includes a support frame, a recycling bin, a boiler, a first recycling component, and a second recycling component. The recycling bin is connected to the top of the support frame, and a chimney is connected to the top of the recycling bin. The boiler is connected to the bottom of the support frame via a flue. The first and second recycling components are detachably connected inside the recycling bin and are used to recover heat from the flue gas inside the boiler.
2. The boiler flue waste heat recovery device according to claim 1, characterized in that: The first recycling component includes a recycling rack and multiple circulating water pipes. The recycling rack includes a card plate and a recycling plate. The recycling plate is connected to the side wall of the card plate. The recycling plate has a hollow center and multiple grooves on opposite sides. Multiple circulating water pipes are connected to the multiple grooves. One end of the multiple circulating water pipes passes through the recycling box and is connected to the circulation inlet of an external circulating insulated water tank. The other end of the multiple circulating water pipes is connected to the circulation outlet of the external insulated water tank, and a circulating water pump is connected to the joint between the multiple circulating water pipes and the external insulated water tank.
3. The boiler flue waste heat recovery device according to claim 2, characterized in that: The second recycling component includes a recycling rack and a hot water suction pipe. The hot water suction pipe is coiled in a curved shape around the groove of the recycling rack. One end of the hot water suction pipe is connected to a tap water pipe, and the other end of the hot water suction pipe is connected to an insulated water tank.
4. A boiler flue waste heat recovery device according to claim 3, characterized in that: The first recycling component is located at the bottom of the second recycling component.
5. A boiler flue waste heat recovery device according to claim 4, characterized in that: A screening block is connected between the first recycling component and the second recycling component, and the middle of the screening block is a sieve.