Flue gas waste heat recovery equipment for gas-fired boiler

Abstract

The utility model relates to the technical field of gas-fired boilers, in particular to gas-fired boiler flue gas waste heat recovery equipment which comprises a boiler body, a condenser is arranged at one end of the boiler body, a heat collector is arranged at one end of the condenser, a chimney is arranged at one end of the heat collector, and a heat exchanger is arranged at the other end of the chimney. The top of the boiler body, the top of the condenser and the top of the heat collector are provided with a pipe jacking frame, the bottom of the boiler body, the bottom of the condenser and the bottom of the heat collector are provided with a communicating pipe frame, and one end of the bottom of the communicating pipe frame is provided with a heat pump unit. By arranging the boiler body, the condenser, the heat collector, the chimney, the pipe jacking frame, the hot water backflow pipe, the second backflow valve seat, the liquid outlet seat, the liquid outlet valve seat and the heat preservation inner container, in order to recycle heat discharged into the atmosphere, an original boiler smoke discharging system is transformed, the condenser is additionally arranged on the chimney firstly, and the heat collector is additionally arranged on the chimney; after gas is combusted, smoke firstly exchanges heat with heat supply first net return water entering the boiler body through the condenser.

Description

Technical Field

[0001] The utility model relates to the technical field of gas boilers, in particular to a gas boiler flue gas waste heat recovery device. Background Technique

[0002] For example, the patent document with the publication number of CN 209978694 U discloses a gas boiler flue gas waste heat recovery device, including: a finned shell-and-tube heat exchanger, a detachable plate heat exchanger, a heat preservation water tank, a circulating pump, an electric control valve, a check valve, a tap water inlet pipe, the first, second, third, and fourth gate valves. The exhaust pipe of the gas boiler is connected to the inlet pipe of the finned shell-and-tube heat exchanger, the outlet pipe of the finned shell-and-tube heat exchanger is connected back to the gas boiler, the finned shell-and-tube heat exchanger further includes a first cold medium inlet pipe and a first hot medium outlet pipe, the first hot medium outlet pipe is connected to the second gate valve, and one end of the second gate valve far from the first hot medium outlet pipe is connected to the water inlet end of the circulating pump through a pipeline. A gas boiler flue gas waste heat recovery device disclosed by the utility model has the characteristics of long service life, high heat exchange efficiency, etc.

[0003] However, the traditional heat transfer method of gas boilers mainly uses the radiant heat generated by gas combustion to heat the boiler water, and the convective heat generated by gas combustion is not fully utilized and is directly discharged into the atmosphere along with the flue gas. It is impossible to properly recover the waste heat inside the gas boiler and perform the purification treatment operation of the exhaust gas, which cannot meet the daily use requirements. Therefore, it is urgent to design a gas boiler flue gas waste heat recovery device to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a gas boiler flue gas waste heat recovery device to solve the problem proposed in the above background technique that the traditional heat transfer method of gas boilers mainly uses the radiant heat generated by gas combustion to heat the boiler water, and the convective heat generated by gas combustion is not fully utilized and is directly discharged into the atmosphere along with the flue gas. It is impossible to properly recover the waste heat inside the gas boiler and perform the purification treatment operation of the exhaust gas, which cannot meet the daily use requirements.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A gas boiler flue gas waste heat recovery device, including a boiler body, one end of the boiler body is provided with a condenser, one end of the condenser is provided with a heat extractor, one end of the heat extractor is provided with a chimney, and a top pipe rack is arranged on the tops of the boiler body, the condenser and the heat extractor;

[0006] A connecting pipe rack, a connecting pipe rack is arranged at the bottoms of the boiler body, the condenser and the heat extractor, a heat pump unit is arranged at one end of the bottom of the connecting pipe rack, and an air preheater is arranged at the other end of the bottom of the connecting pipe rack.

[0007] Preferably, an antifreeze circulation pipe is arranged inside the connecting pipe rack, and a liquid control valve is fixedly connected to the surface of the antifreeze circulation pipe.

[0008] Preferably, a fresh air duct is arranged on the surface of the connecting pipe rack, and a first return valve seat is arranged on the side surface of the connecting pipe rack.

[0009] Preferably, a hot water return pipe is arranged on the surface of the top pipe rack, and a second return valve seat is arranged on the side surface of the top pipe rack.

[0010] Preferably, a liquid outlet seat is arranged on the side surface of the boiler body, and an outlet valve seat is arranged on the side surface of the top pipe rack on the side surface of the condenser.

[0011] Preferably, a heat preservation inner liner is arranged inside the liquid outlet seat.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] For this gas boiler flue gas waste heat recovery device, by arranging the boiler body, condenser, heat extractor, chimney, top pipe rack, hot water return pipe, second return valve seat, liquid outlet seat, outlet valve seat and heat preservation inner liner, in order to recover and utilize the heat discharged into the atmosphere, the original boiler flue gas system is transformed. First, a condenser is added to the chimney. After the gas is burned, the flue gas first passes through the condenser to exchange heat with the heating network return water entering the boiler body. The flue gas passing through the condenser can reduce the temperature of the flue gas from 110°C - 200°C to 52°C, and increase the temperature of the heating network return water entering the boiler body from 46°C to 52°C. Then the flue gas passes through the heat extractor and is finally discharged from the chimney. A condenser and a heat extractor are installed on the original boiler body. The high-temperature flue gas first heats up the heating network return water through the condenser. By recovering the waste heat in the flue gas, the flue gas discharge temperature of the boiler body is reduced from 110°C - 200°C to 35°C for heating the heating network return water, which can save a large amount of energy costs for enterprises, improve the economic benefits of enterprises, and reflect the practicability of the equipment design.

[0014] The flue gas waste heat recovery equipment of this gas boiler further improves the overall use effect of the equipment through the set connecting pipe rack, heat pump unit, air preheater, antifreeze liquid circulation pipe, liquid control valve, fresh air duct and first return valve seat. During daily use, the heat pump unit is used to heat the heating return water with the waste heat of the flue gas extracted by the antifreeze liquid, increasing the return water of the first heating network from 46°C to 80°C for heating. After the waste heat of the flue gas extracted by the antifreeze liquid passes through the heat absorption of the heat pump unit, a small amount of the remaining heat passes through the air preheater to increase the temperature of the combustion air for the gas boiler body. Since the winter temperature is relatively low, the preheated air can improve the combustion stability of the boiler, reduce the consumption of combustion gas and the NOx emission. Then the flue gas further absorbs the heat in the flue gas through the heat extractor and is used by the heat pump unit to heat the first heating network return water. Finally, it passes through the air preheater to increase the air supply temperature during boiler combustion, improve the boiler combustion efficiency and further reduce the NOx generated during boiler combustion, reflecting the comprehensiveness of the equipment design. Brief Description of the Drawings

[0015] Figure 1 is a three-dimensional schematic diagram of the structure of the present utility model;

[0016] Figure 2 is an overall schematic diagram of the connecting pipe rack structure of the present utility model;

[0017] Figure 3 is an overall schematic diagram of the top pipe rack structure of the present utility model;

[0018] Figure 4 For the present utility model Figure 1 is an enlarged schematic diagram of the structure at A in the figure.

[0019] In the figure: 1. Boiler body; 2. Condenser; 3. Heat extractor; 4. Chimney; 5. Top pipe rack; 6. Connecting pipe rack; 7. Heat pump unit; 8. Air preheater; 9. Antifreeze liquid circulation pipe; 10. Liquid control valve; 11. Fresh air duct; 12. First return valve seat; 13. Hot water return pipe; 14. Second return valve seat; 15. Liquid outlet seat; 16. Liquid outlet valve seat; 17. Heat preservation inner liner. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-4 , an embodiment provided by the present utility model:

[0022] A gas boiler flue gas waste heat recovery device, including a boiler body 1, a condenser 2 is arranged at one end of the boiler body 1, a heat extractor 3 is arranged at one end of the condenser 2, a chimney 4 is arranged at one end of the heat extractor 3, a top pipe rack 5 is arranged at the top of the boiler body 1, the condenser 2 and the heat extractor 3, a liquid outlet seat 15 is arranged on the side of the boiler body 1, a liquid outlet valve seat 16 is arranged on the side of the condenser 2 and on the side of the top pipe rack 5, and a heat preservation inner liner 17 is arranged inside the liquid outlet seat 15.

[0023] A connecting pipe rack 6, a connecting pipe rack 6 is arranged at the bottom of the boiler body 1, the condenser 2 and the heat extractor 3, a heat pump unit 7 is arranged at one end of the bottom of the connecting pipe rack 6, an air preheater 8 is arranged at the other end of the bottom of the connecting pipe rack 6, an antifreeze circulation pipe 9 is arranged inside the connecting pipe rack 6, a liquid control valve 10 is fixedly connected to the surface of the antifreeze circulation pipe 9, a fresh air duct 11 is arranged on the surface of the connecting pipe rack 6, a first return valve seat 12 is arranged on the side of the connecting pipe rack 6, a hot water return pipe 13 is arranged on the surface of the top pipe rack 5, and a second return valve seat 14 is arranged on the side of the top pipe rack 5.

[0024] Working principle: When in use, the user first recovers and utilizes the heat discharged into the atmosphere, transforms the original boiler flue gas system, first adds a condenser 2 to the chimney 4. After the gas burns, the flue gas first exchanges heat with the heating return water of the first network entering the boiler body 1 through the condenser 2. The flue gas passing through the condenser 2 can reduce the temperature of the flue gas from 110°C - 200°C to 52°C, and increase the temperature of the heating return water of the first network entering the boiler body 1 from 46°C to 52°C. Then the flue gas passes through the heat extractor 3 and is finally discharged from the chimney 4. By installing a condenser 2 and a heat extractor 3 on the original boiler body 1, the high-temperature flue gas first heats and raises the temperature of the heating return water of the first network through the condenser 2. By recovering the waste heat in the flue gas, the flue gas discharge temperature of the boiler body 1 is reduced from 110°C - 200°C to 35°C for heating the return water of the first network, which can save a large amount of energy costs for the enterprise and improve the economic benefits of the enterprise. During daily use, the heat pump unit 7 is used to utilize the waste heat of the flue gas extracted by the antifreeze to heat the heating return water, so that the heating return water of the first network is increased from 46°C to 80°C for heating. After the waste heat of the flue gas extracted by the antifreeze is absorbed by the heat pump unit 7, the remaining small amount of heat passes through the air preheater 8 to increase the temperature of the air for combustion of the gas boiler body 1. Since the winter temperature is relatively low, the preheated air can improve the combustion stability of the boiler, reduce the gas consumption for combustion and the NOx emissions. Then the flue gas passes through the heat extractor 3 to further absorb the heat in the flue gas and is used by the heat pump unit 7 to heat the heating return water of the first network, and finally passes through the air preheater 8 to increase the air supply temperature during boiler combustion, improve the boiler combustion efficiency and further reduce the NOx generated during boiler combustion. The above is all the working principles of the present invention.

[0025] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A gas boiler flue gas waste heat recovery device, comprising a boiler body (1), characterized in that: A condenser (2) is disposed at one end of the boiler body (1), a heat collector (3) is disposed at one end of the condenser (2), a chimney (4) is disposed at one end of the heat collector (3), and a top pipe rack (5) is disposed on the top of the boiler body (1), the condenser (2) and the heat collector (3); A connecting pipe rack (6) is provided at the bottom of the boiler body (1), the condenser (2) and the heat collector (3); a heat pump unit (7) is provided at one end of the bottom of the connecting pipe rack (6); and an air preheater (8) is provided at the other end of the bottom of the connecting pipe rack (6).

2. A gas boiler flue gas waste heat recovery device according to claim 1, characterized in that: An antifreeze liquid circulation pipe (9) is arranged inside the connecting pipe rack (6), and a liquid control valve (10) is fixedly connected to the surface of the antifreeze liquid circulation pipe (9).

3. The gas boiler flue gas waste heat recovery device according to claim 1, characterized in that: A fresh air duct (11) is arranged on the surface of the connecting pipe rack (6), and a first return valve seat (12) is arranged on the side of the connecting pipe rack (6).

4. The gas boiler flue gas waste heat recovery device according to claim 1, characterized in that: A hot water return pipe (13) is arranged on the surface of the top pipe rack (5), and a second return valve seat (14) is arranged on the side of the top pipe rack (5).

5. The gas boiler flue gas waste heat recovery device according to claim 1, characterized in that: A liquid outlet seat (15) is provided on the side of the boiler body (1), a top pipe rack (5) is provided on the side of the condenser (2), and a liquid outlet valve seat (16) is provided on the side of the condenser (2).

6. A gas boiler flue gas waste heat recovery device according to claim 5, characterized in that: A heat-insulating liner (17) is arranged inside the liquid outlet seat (15).

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