High-efficiency recovery device for exhaust smoke waste heat of natural gas boiler

Abstract

The utility model relates to a high-efficiency recovery device for exhaust smoke waste heat of a natural gas boiler, which belongs to the technical field of natural gas boilers and comprises a natural gas heating medium furnace, a chimney is arranged at the side end of the natural gas heating medium furnace, and an exhaust pipe communicated with the chimney is arranged between one end of the natural gas heating medium furnace and the chimney. An exhaust pipe is arranged at one end of the natural gas heating medium furnace, an air supplementing pipe is arranged at the other end of the natural gas heating medium furnace, an energy-saving heat exchanger is arranged between the exhaust pipe and the natural gas heating medium furnace, an exhaust smoke waste heat recycling pipe is arranged between the energy-saving heat exchanger and the natural gas heating medium furnace, and a heat exchange circulating pipe is arranged in the energy-saving heat exchanger. Natural gas is combusted as fuel and exchanges heat with a heating medium, the heating medium provides a heat source for polymerization reaction, and the stability of the product quality is determined by the temperature stability of the heating medium. The energy utilization efficiency of the natural gas heating medium furnace is remarkably improved, energy consumption is reduced, and the influence on the environment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas boiler technical field, concretely relates to a kind of natural gas boiler exhaust flue gas waste heat high-efficiency recovery device. BACKGROUND

[0002] Boiler is a kind of energy conversion equipment, the energy input to boiler has chemical energy in fuel, electric energy, boiler exports have certain heat steam, high-temperature water or organic heat carrier.The exhaust flue gas generated in the production process of traditional natural gas heat medium furnace is directly discharged into the atmosphere, which causes a lot of resource waste, increases the production cost of enterprises, and brings environmental pollution.This not only causes damage to the environment, but also is an economic loss.

[0003] Natural gas heat medium furnace flue gas waste heat recovery technology is a kind of effective utilization of flue gas generated by natural gas heat medium furnace combustion, heat exchange is carried out through scientific method, so as to realize energy resource saving and environmental protection.The application of this technology has important significance for promoting sustainable development.The efficiency of natural gas heat medium furnace is generally between 90-92%, the method to improve the efficiency of heat medium furnace is to recover the exhaust flue gas waste heat of heat medium furnace, and the degree of recovery determines the efficiency of the heat medium furnace after transformation. SUMMARY

[0004] The utility model mainly solves the deficiency existing in prior art, provides a kind of natural gas boiler exhaust flue gas waste heat high-efficiency recovery device, and heat exchange is carried out by natural gas as fuel combustion and heat medium, and heat medium provides heat source for polymerization reaction, and the stability of heat medium temperature determines the stability of product quality.Obviously improve the energy utilization efficiency of natural gas heat medium furnace, reduce energy consumption, reduce the influence on environment.

[0005] The above technical problems of the utility model are mainly solved by the following technical scheme:

[0006] A kind of natural gas boiler exhaust flue gas waste heat high-efficiency recovery device, including natural gas heat medium furnace, the side end of natural gas heat medium furnace is equipped with chimney, the one end of natural gas heat medium furnace is equipped with the exhaust pipe being communicated with chimney between chimney, the other end of natural gas heat medium furnace is equipped with air supplement pipe, the energy-saving heat exchanger is equipped between the exhaust pipe and natural gas heat medium furnace, the exhaust flue gas waste heat recycling pipe is equipped between the energy-saving heat exchanger and natural gas heat medium furnace, heat exchange circulation pipe is equipped in the energy-saving heat exchanger.

[0007] Energy-saving heat exchanger uses coil type heat exchanger and hot water system heat exchange, and the waste heat generated by natural gas heat medium furnace is transferred to hot water system by coil type energy-saving heat exchanger, to meet the temperature rising demand of tank area hot water, realize the secondary utilization of waste heat, further improve the comprehensive utilization rate of energy.

[0008] Preferably, the flue gas waste heat recycling pipe is provided with an air preheater between the flue gas waste heat recycling pipe and the natural gas heat medium furnace.

[0009] The air preheater is used for heat exchange, the air preheater is used for preheating the air entering the natural gas heat medium furnace, the energy required for combustion in the furnace is reduced, and the heat efficiency is improved.

[0010] Preferably, the air preheater is provided with a preheating circulating pipe in communication with the air supplement pipe and the flue gas waste heat recycling pipe.

[0011] The air blower is controlled by frequency conversion technology, the rotation speed of the air blower is controlled, the air supply amount is accurately controlled, the combustion condition in the furnace is finely adjusted, and the heat efficiency is further improved.

[0012] Preferably, the air blower is provided with a ball valve II in communication with the preheating circulating pipe.

[0013] Combustion of natural gas needs oxygen in the air for combustion, if only cold air is used, the temperature of the generated hot gas is not high, and the heat exchange value of the heat medium cannot be reached. A part of hot air is mixed with cold air, the oxygen content in the air is ensured, the heat value entering the heat medium furnace is increased, the heat efficiency is improved, the VOC content of the discharged flue gas is reduced, the heat efficiency of the natural gas heat medium furnace after the technical transformation reaches about 94%, and is greater than the efficiency level of general heat medium furnaces.

[0014] Preferably, one end of the heat exchange circulating pipe is provided with a heat exchange water inlet pipe in communication with the heat exchange circulating pipe, and the other end of the heat exchange circulating pipe is provided with a heat exchange water outlet pipe in communication with the heat exchange circulating pipe.

[0015] Preferably, the air supplement pipe is provided with a ball valve I in communication with the air supplement pipe.

[0016] The natural gas boiler flue gas waste heat efficient recycling device can achieve the following effects:

[0017] The natural gas boiler flue gas waste heat efficient recycling device provided by the utility model, compared with prior art, through heat exchange between natural gas as fuel and heat medium, the heat medium provides heat source for polymerization reaction, and the stability of the heat medium temperature determines the stability of product quality. Effectively recycling and utilizing flue gas waste heat can reduce harmful gas emission, improve air quality and protect ecological environment. Through recycling of waste heat, production enterprises can significantly reduce production cost, reduce energy procurement cost, and improve enterprise economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Chimney; 2. Exhaust pipe; 3. Energy-saving heat exchanger; 4. Exhaust waste heat recovery pipe; 5. Air preheater; 6. Exhaust waste heat recovery pipe; 7. Natural gas heat medium furnace; 8. Air supply pipe; 9. Ball valve I; 10. Blower; 11. Ball valve II; 12. Preheating circulation pipe; 13. Hot water outlet pipe; 14. Hot water inlet pipe; 15. Heat exchange circulation pipe. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0021] Example: Figure 1 As shown, a high-efficiency waste heat recovery device for natural gas boiler flue gas includes a natural gas heat medium boiler 7, a chimney 1 at one end of the natural gas heat medium boiler 7, an exhaust pipe 2 connected to the chimney 1 at one end of the natural gas heat medium boiler 7, and an air supply pipe 8 at the other end of the natural gas heat medium boiler 7. A ball valve I 9 connected to the air supply pipe 8 is installed on the air supply pipe 8. An energy-saving heat exchanger 3 is installed between the exhaust pipe 2 and the natural gas heat medium boiler 7. A heat exchange circulation pipe 15 is installed inside the energy-saving heat exchanger 3. A hot water inlet pipe 14 connected to the heat exchange circulation pipe 15 is installed at one end of the heat exchange circulation pipe 15, and a hot water outlet pipe 13 connected to the heat exchange circulation pipe 15 is installed at the other end of the heat exchange circulation pipe 15. A waste heat recovery pipe 4 is installed between the energy-saving heat exchanger 3 and the natural gas heat medium boiler 7. An air preheater 5 is installed between the waste heat recovery pipe 4 and the natural gas heat medium boiler 7. A flue gas recovery pipe 6 is installed between the air preheater 5 and the natural gas heat medium boiler 7. The air preheater 5 is equipped with a preheating circulation pipe 12 that is connected to the air supply pipe 8 and the exhaust waste heat recovery pipe 4. A blower 10 connected to the preheating circulation pipe 12 is installed between the air preheater 5 and the exhaust waste heat recovery pipe 4. A ball valve II 11 connected to the preheating circulation pipe 12 is installed between the blower 10 and the air preheater 5.

[0022] In summary, this high-efficiency waste heat recovery device for natural gas boilers utilizes natural gas as fuel for combustion and heat exchange with a heat medium. The heat medium provides the heat source for the polymerization reaction, and the stability of the heat medium's temperature determines the stability of product quality. Effective recovery and utilization of waste heat reduces the emission of harmful gases, contributing to improved air quality and environmental protection. By recovering and utilizing waste heat, manufacturing enterprises can significantly reduce production costs, decrease energy procurement expenses, and improve their economic efficiency.

[0023] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments but that the application can be implemented in other embodiments without departing from the essential attributes thereof, and that the intent of the application is embodied in such alternative embodiments. Therefore, the embodiments should be considered illustrative and not restrictive, the only limitation being imposed by the claims set forth herein. No reference signs in the claims should be considered as limiting the scope of the claims in any way.

[0024] In summary, the above-described is only a specific embodiment of the present application, but the structural features of the present application are not limited to this, any person skilled in the art in the field of the present application, the changes or modifications are covered in the patent scope of the present application.

Claims

1. A high-efficiency waste heat recovery device for natural gas boiler flue gas, characterized in that: The natural gas heat medium furnace (7) is provided with a chimney (1) at the side end, and is provided with an exhaust pipe (2) connected with the chimney (1) between one end of the natural gas heat medium furnace (7) and the chimney (1), and is provided with an air supplement pipe (8) at the other end of the natural gas heat medium furnace (7), and is provided with an energy-saving heat exchanger (3) between the exhaust pipe (2) and the natural gas heat medium furnace (7), and is provided with an exhaust heat recycling pipe (4) between the energy-saving heat exchanger (3) and the natural gas heat medium furnace (7), and is provided with a heat exchange circulating pipe (15) in the energy-saving heat exchanger (3).

2. The natural gas boiler flue gas waste heat high-efficiency recovery device according to claim 1, characterized in that: The exhaust heat recycling pipe (4) is provided with an air preheater (5) between the exhaust heat recycling pipe (4) and the natural gas heat medium furnace (7), and is provided with an exhaust gas recycling pipe (6) between the air preheater (5) and the natural gas heat medium furnace (7).

3. The natural gas boiler flue gas high-efficiency waste heat recovery device according to claim 2, characterized in that: The air preheater (5) is provided with a preheating circulating pipe (12) in communication with the air supplement pipe (8) and the exhaust heat recycling pipe (4), and is provided with a fan (10) in communication with the preheating circulating pipe (12) between the air preheater (5) and the exhaust heat recycling pipe (4).

4. The natural gas boiler flue gas high-efficiency waste heat recovery device according to claim 3, characterized in that: The fan (10) is provided with a ball valve II (11) in communication with the preheating circulating pipe (12) between the fan (10) and the air preheater (5).

5. The natural gas boiler flue gas high-efficiency waste heat recovery device according to claim 1, characterized in that: One end of the heat exchange circulating pipe (15) is provided with a heat exchange water inlet pipe (14) in communication with the heat exchange circulating pipe (15), and the other end of the heat exchange circulating pipe (15) is provided with a heat exchange water outlet pipe (13) in communication with the heat exchange circulating pipe (15).

6. The natural gas boiler flue gas high-efficiency waste heat recovery device according to claim 1, characterized in that: The air supplement pipe (8) is provided with a ball valve I (9) in communication with the air supplement pipe (8).

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