A gas boiler heat recovery device
By designing components such as an atmospheric pressure water tank and spiral coils, the problem of high requirements for pump head and sealing performance in existing boiler heat recovery devices has been solved, achieving efficient recovery and utilization of flue gas heat energy, extending equipment life, and reducing energy waste.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- UNID JIANGSU CHEM CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-10
AI Technical Summary
Existing boiler heat recovery devices typically employ a pressurized structure, which presents challenges due to high requirements for pump head, water quality, and system sealing, resulting in poor performance and failure to effectively recover waste heat from the boiler's high-temperature flue gas.
The circulating recovery device consists of an atmospheric pressure water tank, a hot water circulating pump, circulating water pipes, an energy saver, and a water supply pump. Combined with spiral coils, heat-conducting fins, and flow guide cones, it achieves atmospheric pressure heat recovery. The cold water supply zone and the circulating heating zone are separated by a partition, which enables the orderly integration and gradual heating of cold and hot water.
It improves heat recovery efficiency, reduces the equipment's requirements for pump head and materials, extends its service life, and achieves efficient recovery and utilization of flue gas heat energy, avoiding the temperature drop caused by cold water directly entering the boiler.
Smart Images
Figure CN224479648U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of gas boiler technology, specifically a heat recovery device for gas boilers. Background Technology
[0002] Boilers, as widely used industrial thermal energy equipment, consume enormous amounts of energy and emit large quantities of high-temperature flue gas. The waste heat contained in this gas is not effectively recovered and utilized, which not only wastes energy but also exacerbates the environmental burden. Developing and applying boiler heat recovery is of great significance for improving energy efficiency, reducing energy consumption, and reducing pollutant emissions. Existing heat recovery devices typically adopt a pressurized structure, which has high heat recovery efficiency, but it has certain requirements on pump head, water quality, system sealing, and materials. Therefore, this application proposes a gas-fired boiler heat recovery device to achieve atmospheric pressure heat recovery. Utility Model Content
[0003] In view of the above situation and to overcome the shortcomings of the prior art, this utility model provides a heat recovery device for a gas boiler, which effectively solves the problem of poor performance of existing heat recovery devices.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a heat recovery device for a gas-fired boiler, comprising a circulation recovery device body and a boiler body, wherein a fan is provided at one end of the boiler body and a flue pipe is provided at the other end of the boiler body, the circulation recovery device body is connected to the boiler body and the flue pipe, the circulation recovery device body is composed of an atmospheric pressure water tank, a hot water circulation pump, a first circulation water pipe, an energy saver, a second circulation water pipe, a feed water pump and a boiler feed water pipe, the energy saver is connected to the flue pipe, the first circulation water pipe and the second circulation water pipe are both connected between the energy saver and the atmospheric pressure water tank, the hot water circulation pump is connected to the first circulation water pipe, the boiler feed water pipe is connected between the atmospheric pressure water tank and the boiler body, and the feed water pump is connected to the boiler feed water pipe;
[0005] The energy saver consists of an outer shell and a spiral coil. The spiral coil is installed inside the outer shell, and its two ends are connected to circulating water pipe one and circulating water pipe two, respectively.
[0006] The interior of the atmospheric pressure water tank is fixedly equipped with a partition, which divides the interior of the atmospheric pressure water tank into a cold water supply area and a circulating heating area. A cold water supply pipe extending into the cold water supply area is installed through one side of the top of the atmospheric pressure water tank. Circulating water pipe one, circulating water pipe two and boiler feed water pipe are all connected to the circulating heating area. An overflow groove is formed between the top of the partition and the inner wall of the atmospheric pressure water tank.
[0007] Preferably, a plurality of heat-conducting fins are fixedly provided on the outer surface of the spiral coil, and a condensate drain pipe is fixedly provided at the bottom end of the outer shell.
[0008] Preferably, a flow guide cone is fixedly provided at the middle position of one end of the inner shell, and the flow guide cone is fixedly connected to the outer shell through several support plates.
[0009] Preferably, a hot water intake pipe connected to the circulating heating zone is fixedly installed at the bottom of the front of the atmospheric pressure water tank.
[0010] Preferably, one end of the circulating water pipe extends into the interior of the circulating heating zone, and a number of branch water inlets are fixedly provided at the end of the circulating water pipe near the circulating heating zone. One end of the circulating water pipe extends to the boiler feed water pipe near the circulating heating zone.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] (1) In operation, by setting up a circulating recovery device body consisting of an atmospheric pressure water tank, a hot water circulating pump, circulating water pipe one, an energy saver, circulating water pipe two, a water supply pump and a boiler water supply pipe, atmospheric pressure heat energy recovery can be achieved. It has low requirements for pump head, materials and system sealing, which can improve service life, achieve efficient recovery of flue gas heat energy and reduce heat energy waste.
[0013] (2) By setting heat-conducting fins, flow guide cones and support plates, the flue gas can be guided so that the flue gas blows directly into the spiral coil. The heat conduction effect is improved by the heat-conducting fins, thereby improving the heat exchange efficiency and realizing the efficient utilization of heat energy.
[0014] (3) By setting up partitions, cold water supply area and circulating heating area, cold water and hot water can be isolated, and cold water and hot water can be integrated in an orderly manner to form a gradual heating, thus avoiding cold water from directly entering the circulating water pipe and boiler feed pipe and reducing the feed water temperature. Attached Figure Description
[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.
[0016] In the attached diagram:
[0017] Figure 1 This is a schematic diagram of the structure of the gas boiler heat recovery device of this utility model;
[0018] Figure 2 This is a schematic diagram of the main structure of the recycling device of this utility model;
[0019] Figure 3 This is a cross-sectional view of the main body of the recycling device of this utility model;
[0020] Figure 4This is a schematic diagram of the internal structure of the energy-saving device of this utility model;
[0021] Figure 5 This is a schematic diagram of the internal structure of the atmospheric pressure water tank of this utility model;
[0022] In the diagram: 1. Main body of the recycling device; 2. Boiler body; 3. Fan; 4. Exhaust pipe; 5. Atmospheric pressure water tank; 6. Hot water circulation pump; 7. Circulating water pipe one; 8. Energy saver; 9. Circulating water pipe two; 10. Feed pump; 11. Boiler feed pipe; 12. Outer shell; 13. Spiral coil; 14. Baffle plate; 15. Cold water supply area; 16. Circulating heating area; 17. Cold water supply pipe; 18. Overflow trough; 19. Heat-conducting fins; 20. Condensate discharge pipe; 21. Guide cone; 22. Support plate; 23. Hot water intake pipe; 24. Diversion inlet. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0024] Depend on Figures 1 to 5 This utility model discloses a heat recovery device for a gas-fired boiler, comprising a circulation recovery device body 1 and a boiler body 2. A fan 3 is installed at one end of the boiler body 2, and a flue pipe 4 is installed at the other end. The circulation recovery device body 1 is connected to the boiler body 2 and the flue pipe 4. The circulation recovery device body 1 consists of an atmospheric pressure water tank 5, a hot water circulation pump 6, a first circulation water pipe 7, an energy-saving device 8, a second circulation water pipe 9, a feed water pump 10, and a boiler feed water pipe 11. The energy-saving device 8 is connected to the flue pipe 4. The first circulation water pipe 7 and the second circulation water pipe 9 are both connected between the energy-saving device 8 and the atmospheric pressure water tank 5. The hot water circulation pump 6 is connected to the first circulation water pipe 7. The boiler feed water pipe 11 is connected to the atmospheric pressure water tank 5 and the boiler body. Between bodies 2, the water pump 10 is connected to the boiler feed pipe 11. The energy saver 8 is composed of a shell 12 and a spiral coil 13. The spiral coil 13 is installed inside the shell 12. The two ends of the spiral coil 13 are connected to the circulating water pipe 7 and the circulating water pipe 9 respectively. A partition 14 is fixedly installed inside the atmospheric pressure water tank 5. The partition 14 divides the interior of the atmospheric pressure water tank 5 into a cold water supply area 15 and a circulating heating area 16. A cold water supply pipe 17 extending into the cold water supply area 15 is installed through one side of the top of the atmospheric pressure water tank 5. The circulating water pipe 7, the circulating water pipe 9 and the boiler feed pipe 11 are all connected to the circulating heating area 16. An overflow groove 18 is formed between the top of the partition 14 and the inner wall of the atmospheric pressure water tank 5.
[0025] The flue gas generated during the operation of the boiler body 2 is discharged through the flue pipe 4. At this time, heat exchange is achieved through the energy-saving device 8. The hot water circulation pump 6 draws water from the inside of the atmospheric pressure water tank 5 and then enters the spiral coil 13. The flue gas and the spiral coil 13 exchange heat, thereby heating the water. The heated water is discharged back into the interior of the atmospheric pressure water tank 5 through the circulation water pipe 2 9. Through circulation heating, the heat energy of the flue gas is efficiently utilized. The heated hot water is supplied to the boiler body 2 through the feed water pump 10 and the boiler feed water pipe 11. By setting up a cold water supply zone 15 and a circulation heating zone 16 inside the atmospheric pressure water tank 5, the supplied cold water and the circulating hot water can be separated, so that the cold water and hot water are mixed in an orderly manner to form a gradual heating, avoiding the cold water from being discharged directly into the interior of the boiler body 2 through the boiler feed water pipe 11.
[0026] The outer surface of the spiral coil 13 is fixedly provided with several heat-conducting fins 19, which can improve the heat conduction efficiency. The bottom end of the outer shell 12 is fixedly provided with a condensate drain pipe 20, which can drain the condensate.
[0027] A guide cone 21 is fixedly installed at the middle position of one end of the inner shell 12. The guide cone 21 is fixedly connected to the outer shell 12 through several support plates 22, which can guide the flue gas and make the flue gas fully contact the spiral coil 13.
[0028] A hot water intake pipe 23, which is connected to the circulating heating zone 16, is fixedly installed at the bottom of the front of the atmospheric pressure water tank 5, and can supply domestic hot water.
[0029] One end of the circulating water pipe 7 extends into the interior of the circulating heating zone 16. Several branch water inlets 24 are fixedly installed at the end of the circulating water pipe 7 near the circulating heating zone 16. One end of the circulating water pipe 9 extends to the boiler feed water pipe 11 near the circulating heating zone 16, which enables the hot water after circulating heating to be directly supplied to the boiler feed water pipe 11, thereby increasing the water supply temperature.
[0030] In operation, the circulating recovery device, consisting of an atmospheric pressure water tank, a hot water circulating pump, circulating water pipe one, an energy-saving device, circulating water pipe two, a feed water pump, and a boiler feed water pipe, enables atmospheric pressure heat energy recovery. It has lower requirements for pump head, materials, and system sealing, extending service life and achieving efficient recovery of flue gas heat energy while reducing waste. By incorporating heat-conducting fins, guide cones, and support plates, the flue gas is guided directly to the spiral coil, improving heat conduction through the fins and thus increasing heat exchange efficiency for efficient heat energy utilization. Furthermore, by setting up baffles, a cold water feed zone, and a circulating heating zone, cold and hot water are isolated, allowing for their orderly fusion and gradual heating, preventing cold water from directly entering the circulating water pipe one and the boiler feed water pipe, which would lower the feed water temperature.
Claims
1. A heat recovery device for a gas-fired boiler, comprising a circulation recovery device body (1) and a boiler body (2), characterized in that: A fan (3) is provided at one end of the boiler body (2), and a flue pipe (4) is provided at the other end of the boiler body (2). The circulating recovery device body (1) is connected to the boiler body (2) and the flue pipe (4). The circulating recovery device body (1) consists of an atmospheric pressure water tank (5), a hot water circulating pump (6), a circulating water pipe one (7), an energy saver (8), a circulating water pipe two (9), a water supply pump (10), and a boiler water supply pipe (11). The energy saver (8) is connected to the flue pipe (4). The circulating water pipe one (7) and the circulating water pipe two (9) are both connected between the energy saver (8) and the atmospheric pressure water tank (5). The hot water circulating pump (6) is connected to the circulating water pipe one (7). The boiler water supply pipe (11) is connected between the atmospheric pressure water tank (5) and the boiler body (2). The water supply pump (10) is connected to the boiler water supply pipe (11). The energy saver (8) consists of a shell (12) and a spiral coil (13). The spiral coil (13) is installed inside the shell (12). The two ends of the spiral coil (13) are connected to the first circulating water pipe (7) and the second circulating water pipe (9) respectively. A partition (14) is fixedly installed inside the atmospheric pressure water tank (5). The partition (14) divides the interior of the atmospheric pressure water tank (5) into a cold water supply area (15) and a circulating heating area (16). A cold water supply pipe (17) extending into the cold water supply area (15) is installed through one side of the top of the atmospheric pressure water tank (5). Circulating water pipe one (7), circulating water pipe two (9) and boiler water supply pipe (11) are all connected to the circulating heating area (16). An overflow groove (18) is formed between the top of the partition (14) and the inner wall of the atmospheric pressure water tank (5).
2. The heat recovery device for a gas-fired boiler according to claim 1, characterized in that: The outer surface of the spiral coil (13) is fixedly provided with several heat-conducting fins (19), and the bottom end of the outer shell (12) is fixedly provided with a condensate drain pipe (20).
3. The heat recovery device for a gas-fired boiler according to claim 1, characterized in that: A flow guide cone (21) is fixedly installed at the middle position of one end of the inner shell (12). The flow guide cone (21) is fixedly connected to the outer shell (12) through several support plates (22).
4. The heat recovery device for a gas-fired boiler according to claim 1, characterized in that: The bottom of the front of the atmospheric pressure water tank (5) is fixedly provided with a hot water intake pipe (23) that is connected to the circulating heating zone (16).
5. A heat recovery device for a gas-fired boiler according to claim 1, characterized in that: One end of the circulating water pipe (7) extends into the interior of the circulating heating zone (16). Several branch inlets (24) are fixedly installed at the end of the circulating water pipe (7) near the circulating heating zone (16). One end of the circulating water pipe (9) extends to the position of the boiler feed pipe (11) near the circulating heating zone (16).