Energy-saving low-carbon combustion waste heat recovery heat exchange device

Abstract

The utility model relates to the technical field of waste heat recovery, and discloses an energy-saving low-carbon combustion waste heat recovery heat exchange device which comprises a bottom plate, supporting seats are fixedly connected to the left side and the right side of the top of the bottom plate, a boiler is fixedly connected to the tops of the supporting seats, and a fan is fixedly connected to the right side of the outer portion of the bottom plate. The output end of the fan is fixedly connected with an air preheating device, the rear side of the outer portion of the air preheating device is fixedly connected with a waste heat recovery heat exchange mechanism, and the outer portion of the boiler is fixedly connected with a replacement mechanism. According to the utility model, the air preheating device utilizes the waste heat of the boiler to heat the entering air, the combustion efficiency is improved, after passing through the air preheating device, the flue gas continuously flows to the energy saver, the waste heat is further recovered, the heat exchange tube bundle is arranged in the energy saver, the overall energy utilization rate is improved through the heat exchange with the flue gas, and the flue gas is finally discharged through the chimney. And the environment-friendly combustion process is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field especially relates to a kind of energy-saving low-carbon combustion waste heat recovery heat exchange device. BACKGROUND

[0002] In thermal power plant, whether it is coal-fired, gas-fired or oil-fired power generation, the high-temperature flue gas produced by boiler combustion contains a large amount of heat energy. Through the waste heat recovery heat exchange device, the heat is transferred to the condensate water, increasing the feed water temperature, thereby improving the efficiency of the entire thermal cycle. At the same time, in some biomass power plants, the tail gas heat generated by burning biomass is also recovered through this device for regional heating and other purposes.

[0003] In the prior art, some waste heat recovery heat exchange devices separate high-temperature waste heat fluid (such as exhaust gas after combustion) and low-temperature heated fluid (such as combustion air, water, etc.) by solid wall (such as metal pipe wall). Heat is transferred from the high-temperature fluid to the low-temperature fluid through the wall.

[0004] However, in actual use, a large amount of heat generated by combustion is not fully recovered and utilized, but is directly discharged into the environment with exhaust gas, etc. For example, in industrial kilns, if the waste heat cannot be deeply recovered, up to 30%-50% of the heat will be lost, which means that the enterprise needs to consume more fuel to maintain the required heat for production, increasing the energy cost. Therefore, in view of the above problems, an energy-saving low-carbon combustion waste heat recovery heat exchange device is proposed. SUMMARY

[0005] To make up for the above shortcomings, the utility model provides an energy-saving low-carbon combustion waste heat recovery heat exchange device, aiming to improve the problem that some devices in the prior art cannot deeply recover waste heat.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An energy-saving low-carbon combustion waste heat recovery heat exchange device, comprising a bottom plate, the top of the bottom plate is fixedly connected with support seats on both sides, the top of the support seat is fixedly connected with a boiler, the outer right side of the bottom plate is fixedly connected with a fan, the output end of the fan is fixedly connected with an air preheating device, the outer rear side of the air preheating device is fixedly connected with a waste heat recovery heat exchange mechanism, the outer side of the boiler is fixedly connected with a replacement mechanism, the inside of the replacement mechanism is provided with a rebound assembly, and the outer side of the replacement mechanism is fixedly connected with an energy saver;

[0008] The waste heat recovery heat exchange mechanism includes a connecting pipe, the other end of the connecting pipe is fixedly connected with a chimney, the outer left side of the economizer is fixedly connected with a butt joint pipe, the other end of the butt joint pipe is fixedly connected with the outer front side of the air preheating device, the outer rear side of the butt joint pipe is fixedly connected with a connecting pipe, and the other end of the connecting pipe is fixedly connected with the outer rear side of the air preheating device;

[0009] As a further description of the above technical scheme:

[0010] The replacement mechanism includes a fixed pipe, the outer side of the fixed pipe is slidingly connected with a top cover, the outer side of the top cover is fixedly connected with a handle, the outer side of the top cover is fixedly connected with a fixed frame at four corners, the inner side of the fixed frame is rotatably connected with a connecting shaft, the outer side of the connecting shaft is rotatably connected with a rotating plate, the outer side of the rotating plate is fixedly connected with a clamping rod, and the outer side of the fixed pipe is fixedly connected with the outer side of the boiler;

[0011] As a further description of the above technical scheme:

[0012] The rebound assembly includes a spring, one end of the spring is fixedly connected with the outer side of the rotating plate, and the other end of the spring is fixedly connected with the outer side of the top cover;

[0013] As a further description of the above technical scheme:

[0014] The bottom of the top cover is fixedly connected with a filter plate, and the outer bottom end of the filter plate is in contact with the outer side of the fixed pipe;

[0015] As a further description of the above technical scheme:

[0016] The outer side of the bottom plate is fixedly connected with a connecting seat, and the outer bottom end of the economizer is in contact with the outer top end of the connecting seat;

[0017] As a further description of the above technical scheme:

[0018] The outer right side of the boiler is fixedly connected with a combustion machine, the outer front side of the combustion machine is fixedly connected with a fixed block, the inner side of the fixed block is fixedly connected with a gas valve group, the top of the combustion machine is fixedly connected with a supporting pipe, and the other end of the supporting pipe is fixedly connected with the outer side of the air preheating device;

[0019] As a further description of the above technical scheme:

[0020] The top left side of the boiler is fixedly connected with a plurality of connecting rods, the top right side of the boiler is fixedly connected with a plurality of valves, and the rear side of the boiler is fixedly connected with a control panel;

[0021] As a further description of the above technical scheme:

[0022] The outer part of the butt joint pipe is fixedly connected with a spraying device, and the outer bottom end of the spraying device is fixedly connected to the top left side of the bottom plate.

[0023] The utility model has the advantages of the following:

[0024] 1、The fan provides air flow, promotes heat exchange between flue gas and air, the air preheating device heats the incoming air using the waste heat of the boiler, improves combustion efficiency, after the air preheating device, flue gas continues to flow to the energy saver, further recovers waste heat, the energy saver is internally provided with heat exchange tube bundles, through heat exchange with flue gas, more heat energy is recovered, so that overall energy utilization rate is improved, flue gas is finally discharged through a chimney, and environmental protection during the combustion process is ensured.

[0025] 2、The mechanism is pressed to rotate the plate, so that the rotating plate can extrude the spring, and then the rotating plate can drive the clamping rod to unlock the top cover, then the handle can be pulled out to replace the filter plate, the spring is released, and then the rotating plate can lock the top cover, so that the top cover does not loosen during operation. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A three-dimensional schematic view of an energy-saving low-carbon combustion waste heat recovery heat exchange device is provided for the utility model;

[0027] Figure 2 An air preheating device structure diagram of an energy-saving low-carbon combustion waste heat recovery heat exchange device is provided for the utility model;

[0028] Figure 3 A boiler structure diagram of an energy-saving low-carbon combustion waste heat recovery heat exchange device is provided for the utility model;

[0029] Figure 4 A Figure 3 An enlarged view of position A in the middle.

[0030] LEGEND:

[0031] 1, bottom plate; 2, support seat; 3, boiler; 4, fan; 5, air preheating device; 6, connecting pipe; 7, chimney; 8, adapter pipe; 9, connecting seat; 10, energy saver; 11, butt joint pipe; 12, fixed pipe; 13, combustion machine; 14, fixed block; 15, gas valve group; 16, support pipe; 17, top cover; 18, handle; 19, fixing frame; 20, connecting shaft; 21, rotating plate; 22, clamping rod; 23, spring; 24, filter plate; 25, valve; 26, connecting rod; 27, control panel; 28, spraying device. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0033] With reference to Figures 1 to 3 The present application provides an embodiment: an energy-saving and low-carbon combustion waste heat recovery heat exchange device, comprising a bottom plate 1, which is used as the basic load-bearing component of the whole device. The material of the bottom plate 1 is usually selected from metal materials with high strength, good stability and corrosion resistance, such as carbon steel. The carbon steel bottom plate 1 has high strength and rigidity, can bear the weight of each component of the device and various external forces generated during operation, and ensures the stability of the overall structure of the device. The cost is relatively low, and it is commonly used in some application scenarios with strict cost control and relatively good environmental conditions. The top and left and right sides of the bottom plate 1 are fixedly connected with support seats 2. The support seat 2 is an important component for connecting the bottom plate 1 and the boiler 3. The material of the support seat 2 is generally compatible with the bottom plate 1 or uses metal materials with higher strength and heat resistance, such as carbon steel. The carbon steel support seat 2 has high strength and rigidity, can stably support the weight of the boiler 3, and its cost is relatively reasonable. It is widely used in general waste heat recovery heat exchange devices. The top of the support seat 2 is fixedly connected with the boiler 3. The boiler 3 is the core equipment for generating heat. The material of the boiler 3 is generally high-strength carbon steel, and the inside is lined with high-temperature-resistant and corrosion-resistant refractory materials, such as refractory bricks or refractory castables. The carbon steel boiler 3 has high strength and good processing performance, can withstand the action of internal high-pressure steam and high-temperature flame, and its cost is relatively low. It is widely used in some medium-low pressure and small-scale industrial boilers 3.

[0034] The outer right side of the bottom plate 1 is fixedly connected with a fan 4, which is a device for providing air flow power and plays a key role in the waste heat recovery heat exchange device. The material of the fan 4 generally includes a metal shell and internal impeller, motor and other components. The metal shell is usually made of carbon steel, which has high strength and good processing performance, can protect the internal components from the external environment, and has relatively low cost. The output end of the fan 4 is fixedly connected with an air preheating device 5, which is a key component for preheating air using the waste heat of the boiler 3. The material of the air preheating device 5 is generally selected from carbon steel, and heat exchange pipes are arranged inside. The carbon steel air preheating device 5 has high strength and good processing performance, can withstand certain pressure and temperature, and has relatively low cost. The outer rear side of the air preheating device 5 is fixedly connected with a waste heat recovery heat exchange mechanism, which further recovers and utilizes the waste heat of the boiler, improves the energy utilization rate, and the outer side of the boiler 3 is fixedly connected with a replacement mechanism. The replacement mechanism is used for conveniently maintaining and replacing the internal components or pipelines of the boiler 3. The replacement mechanism includes a fixed pipe 12, which is generally a circular pipe. The diameter of the fixed pipe 12 is determined according to the interface diameter of the boiler 3 and the requirements of the connected components. The outer side of the fixed pipe 12 is slidably connected with a top cover 17, which is a component for closing the opening of the fixed pipe 12. The material of the top cover 17 is generally carbon steel or stainless steel, which has high strength and corrosion resistance. The shape of the top cover 17 is generally a circular plate, and the diameter is determined according to the outer diameter of the fixed pipe 12, which is generally slightly larger than the outer diameter of the fixed pipe 12, with a gap of several to tens of millimeters, so as to cover the opening of the fixed pipe 12 and form a good seal with the fixed pipe 12. The outer side of the top cover 17 is fixedly connected with a handle 18, which is a component for operating the top cover 17. The material of the handle 18 is generally metal or plastic. The metal handle 18 is generally made of carbon steel, which has high strength and corrosion resistance. The plastic handle 18 has good insulation and hand feeling. The shape of the handle 18 is generally strip-shaped or arc-shaped, which is convenient for the operator to hold and apply force. The length of the handle 18 is determined according to the actual operation requirements. The outer four corners of the top cover 17 are fixedly connected with a fixed frame 19, which is a component for connecting the rotating plate 21 and the top cover 17. The material of the fixed frame 19 is generally metal, such as carbon steel or stainless steel, which has high strength and rigidity, can stably support the rotating plate 21 and transmit force. The inner side of the fixed frame 19 is rotatably connected with a connecting shaft 20, which is the rotation center shaft of the rotating plate 21. The material of the connecting shaft 20 is generally high-strength alloy steel, which has good comprehensive mechanical properties.

[0035] The connecting shaft 20 is externally connected with the rotating plate 21, and the connecting shaft 20 serves as the rotating center shaft of the rotating plate 21. The material of the connecting shaft 20 is generally high-strength alloy steel. The alloy steel connecting shaft 20 has excellent comprehensive mechanical properties in strength, toughness and wear resistance, can withstand the large torque and impact force generated by the rotating plate 21 during rotation, avoids bending or breaking phenomenon during long-term use, and ensures the stable rotation of the rotating plate 21. The outer part of the rotating plate 21 is fixedly connected with a clamping rod 22. The clamping rod 22 is a key component for clamping or locking with the fixed tube 12 or other related components. The material of the clamping rod 22 is generally metal, such as carbon steel. The carbon steel clamping rod 22 has high strength and rigidity, can stably clamp with the fixed tube 12 or other components, ensures the reliability of the replacement mechanism in the locked state, and has relatively low cost. The outer part of the fixed tube 12 is fixedly connected to the outside of the boiler 3. The inside of the replacement mechanism is provided with a rebound assembly. The rebound assembly includes a spring 23. The spring 23 plays a key role in rebounding and auxiliary positioning in the replacement mechanism. The spring 23 is made of high-quality spring 23 steel material. The spring constant is accurately calculated and designed according to the size, weight and required rebounding force of the rotating plate 21, so as to ensure that the rotating plate 21 can be provided with appropriate elastic support under various working conditions. The rebound assembly includes a spring 23. One end of the spring 23 is fixedly connected to the outside of the rotating plate 21. The other end of the spring 23 is fixedly connected to the outside of the top cover 17. The outside of the replacement mechanism is fixedly connected with an energy saver 10. The energy saver 10 is an important part of the waste heat recovery heat exchange device. The material of the energy saver 10 is generally carbon steel, and the inside of the energy saver 10 is provided with heat exchange tube bundles. The carbon steel energy saver 10 has high strength and good processing performance, can withstand certain pressure and temperature, and has relatively low cost. The stainless steel energy saver 10 is known for its excellent corrosion resistance, and is particularly suitable for use in humid and corrosive environments, which can effectively prevent the device from rusting and corroding, and ensure its long-term stable operation.

[0036] The waste heat recovery heat exchange mechanism includes a connecting pipe 8. The connecting pipe 8 is a component for connecting the air preheating device 5 and the chimney 7. The material of the connecting pipe 8 is generally carbon steel or stainless steel, which has good high-temperature resistance and corrosion resistance. The shape of the connecting pipe 8 is generally a circular pipe, and its diameter is determined according to the interface diameter of the air preheating device 5 and the chimney 7, which is generally between several tens of centimeters and several meters. The length of the connecting pipe 8 is determined according to the layout requirements of the device. The other end of the connecting pipe 8 is fixedly connected with the chimney 7. The chimney 7 is a channel for discharging flue gas. The material of the chimney 7 is generally carbon steel or stainless steel, which has high strength and corrosion resistance. The shape of the chimney 7 is generally a circular or square vertical pipe, and its height is determined according to environmental protection requirements and the diffusion effect of flue gas discharge.

[0037] The external left side of the economizer 10 is fixedly connected with a docking pipe 11, which is used as a pipe connecting the economizer 10 and the air preheating device 5, and has similar material, shape and size to the connecting pipe 8. The other end of the docking pipe 11 is fixedly connected to the external front side of the air preheating device 5. Through reasonable pipe connection, the flue gas enters the economizer 10 for waste heat recovery after passing through the air preheating device 5, further improving the energy utilization efficiency of the device. The other end of the docking pipe 11 is fixedly connected to the external front side of the air preheating device 5. The external rear side of the docking pipe 11 is fixedly connected with a connecting pipe 6, which has similar material, shape and size to the docking pipe 11. The other end of the connecting pipe 6 is fixedly connected to the external rear side of the air preheating device 5. The connecting pipe 6 and the docking pipe 11 jointly constitute a circulating channel for flue gas between the air preheating device 5 and the economizer 10, ensuring smooth flow of flue gas between components and realizing efficient recovery and utilization of waste heat. The other end of the connecting pipe 6 is fixedly connected to the external rear side of the air preheating device 5.

[0038] Referring to Figures 3 to 4 The bottom of the top cover 17 is fixedly connected with a filter plate 24, which mainly functions to filter the fluid passing through the fixed pipe 12 to prevent impurities from entering the subsequent system components, thereby ensuring normal operation of the equipment and prolonging the service life of the equipment. The material of the filter plate 24 is usually stainless steel, which is known for its excellent corrosion resistance. In the face of various complex fluid environments, especially fluids containing moisture or corrosive substances, it can effectively resist corrosion and maintain stable filtering performance for a long time. The external bottom end of the filter plate 24 is in contact with the outside of the fixed pipe 12. The outside of the bottom plate 1 is fixedly connected with a connecting seat 9, which is an important component for supporting the economizer 10. The material of the connecting seat 9 is generally metal, such as carbon steel or stainless steel. The carbon steel connecting seat 9 has high strength and rigidity, and can stably bear the weight of the economizer 10. Its cost is relatively reasonable, and it is widely used in some devices with strict cost control. The external bottom end of the economizer 10 is in contact with the external top end of the connecting seat 9. The external right side of the boiler 3 is fixedly connected with a combustion machine 13, which is the core equipment for providing heat energy for the boiler 3. The material of the combustion machine 13 is generally high-temperature-resistant metal material, such as stainless steel, and is equipped with an advanced combustion control system. The stainless steel combustion machine 13 has good corrosion resistance and high-temperature resistance, and can withstand high-temperature flame and flue gas erosion for a long time during the operation of the boiler 3, and is not prone to deformation or damage.

[0039] The outer front side of the combustion machine 13 is fixedly connected with a fixed block 14, which is a basic component for installing the gas valve group 15 and is generally made of metal, such as carbon steel or stainless steel, has high strength and rigidity, and can stably fix the gas valve group 15. The inner part of the fixed block 14 is fixedly connected with the gas valve group 15, which includes a main gas valve, a safety valve, an adjusting valve and other valves 25. The main gas valve is used to control the total switch of gas, and its diameter is determined according to the gas flow requirement, generally between a few millimeters to a few tens of millimeters. The safety valve is used to automatically open to release pressure when the gas pressure is too high, to ensure system safety. The top of the combustion machine 13 is fixedly connected with a support pipe 16, which is a component for connecting the combustion machine 13 and the air preheating device 5 and is generally made of metal, such as carbon steel, has high strength and high temperature resistance. The other end of the support pipe 16 is fixedly connected to the outer part of the air preheating device 5. The top left side of the boiler 3 is fixedly connected with a plurality of connecting rods 26, which are components for connecting the boiler 3 with other components or for installing auxiliary equipment. The connecting rods 26 are generally made of metal, such as carbon steel, have high strength and rigidity, can stably bear tension or pressure, and have relatively low cost, so they are widely used in some occasions where the strength requirement is not very high. The top right side of the boiler 3 is fixedly connected with a plurality of valves 25, which are mainly used for controlling the inflow and outflow of fluid in the boiler 3 or pressure adjustment. The valves 25 are generally made of metal, such as carbon steel, and the appropriate material is selected according to different application scenarios and fluid media;

[0040] The rear side of the boiler 3 is fixedly connected with a control panel 27, on which various instruments, indicator lights, buttons and switches are installed. The instruments include a thermometer, a pressure gauge and a liquid level meter, which are used to monitor the operating parameters of the boiler 3 in real time, such as the temperature, pressure and water level in the boiler 3. These instruments have high measurement accuracy and fast response speed, and can provide accurate operating data for the operator to adjust the operating state of the boiler 3 in time. The outer part of the connecting pipe 11 is fixedly connected with a spraying device 28, which plays an important role in the waste heat recovery heat exchange device. Its main function is to spray atomized liquid into the fluid in the connecting pipe 11 to achieve the purpose of cooling, purifying or chemical reaction of the fluid. The spraying device 28 is generally made of stainless steel, which has good corrosion resistance and high temperature resistance, and can stably operate in high temperature, high pressure and corrosive environment, especially suitable for occasions where it contacts with high temperature flue gas or hot water in the waste heat recovery heat exchange device. The outer bottom end of the spraying device 28 is fixedly connected to the top left side of the bottom plate 1.

[0041] Working principle: first, through the heat energy generated by the boiler 3, the boiler 3 as the core equipment, using the heat energy provided by the combustion machine 13, the water is heated into steam, in the operation process of boiler 3, the high temperature flue gas generated by the connecting pipe 8 flows to the air preheating device 5, the fan 4 is responsible for providing air flow, promoting the heat exchange between the flue gas and air. The air preheating device 5 uses the waste heat of the boiler 3 to heat the incoming air, improves the combustion efficiency, after the air preheating device 5, the flue gas continues to flow to the energy saving device 10, further recovers the waste heat, the energy saving device 10 is provided with heat exchange tube bundle inside, through the heat exchange with the flue gas, recovers more heat energy, to improve the overall energy utilization. The flue gas is finally discharged through the chimney 7, to ensure the environmental protection of the combustion process;

[0042] When the filter plate 24 is replaced, the mechanism presses the rotating plate 21, so that the rotating plate 21 extrudes the spring 23, and then the rotating plate 21 drives the clamping rod 22 to unlock the top cover 17, and then the handle 18 is pulled out to replace the filter plate 24, the clamping rod 22 is loosened, the spring 23 rebounds, and then the rotating plate 21 can lock the top cover 17, so that the top cover 17 will not loosen during operation.

[0043] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still modifies the technical scheme recorded in the foregoing embodiments, or makes equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement etc. within the spirit and principle of the utility model, should be contained in the protection scope of the utility model.

Claims

1. An energy-saving low-carbon combustion waste heat recovery heat exchange device, comprising a bottom plate (1), characterized in that: The top left and right sides of the bottom plate (1) are fixedly connected with support seats (2), the top of the support seat (2) is fixedly connected with a boiler (3), the outer right side of the bottom plate (1) is fixedly connected with a fan (4), the output end of the fan (4) is fixedly connected with an air preheating device (5), the outer rear side of the air preheating device (5) is fixedly connected with a waste heat recovery heat exchange mechanism, the outer side of the boiler (3) is fixedly connected with a replacement mechanism, the inside of the replacement mechanism is provided with a rebound assembly, and the outer side of the replacement mechanism is fixedly connected with an energy saver (10). The waste heat recovery heat exchange mechanism comprises a connecting pipe (8), the other end of the connecting pipe (8) is fixedly connected with a chimney (7), the outer left side of the energy saver (10) is fixedly connected with a butt joint pipe (11), the other end of the butt joint pipe (11) is fixedly connected to the outer front side of the air preheating device (5), and the outer rear side of the butt joint pipe (11) is fixedly connected with a connecting pipe (6). The other end of the connecting pipe (6) is fixedly connected to the outer rear side of the air preheating device (5).

2. The energy-saving low-carbon combustion heat recovery heat exchange device according to claim 1, characterized in that: The replacement mechanism comprises a fixed pipe (12), the outer side of the fixed pipe (12) is slidably connected with a top cover (17), the outer side of the top cover (17) is fixedly connected with a handle (18), the outer side of the top cover (17) is fixedly connected with a fixed frame (19) at four corners, the inside of the fixed frame (19) is rotatably connected with a connecting shaft (20), the outer side of the connecting shaft (20) is rotatably connected with a rotating plate (21), the outer side of the rotating plate (21) is fixedly connected with a clamping rod (22), and the outer side of the fixed pipe (12) is fixedly connected to the outer side of the boiler (3).

3. The energy-saving, low-carbon combustion heat recovery heat exchanger according to claim 2, characterized in that: The rebound assembly comprises a spring (23), one end of the spring (23) is fixedly connected to the outer side of the rotating plate (21), and the other end of the spring (23) is fixedly connected to the outer side of the top cover (17).

4. The energy-saving, low-carbon combustion heat recovery heat exchanger according to claim 2, characterized in that: The bottom of the top cover (17) is fixedly connected with a filter plate (24), and the outer bottom end of the filter plate (24) is in contact with the outer side of the fixed pipe (12).

5. The energy-saving, low-carbon combustion heat recovery heat exchanger according to claim 1, characterized in that: The outer side of the bottom plate (1) is fixedly connected with a connecting seat (9), and the outer bottom end of the energy saver (10) is in contact with the outer top end of the connecting seat (9).

6. The energy-saving, low-carbon combustion heat recovery heat exchanger according to claim 3, characterized in that: The outer right side of the boiler (3) is fixedly connected with a combustion machine (13), the outer front side of the combustion machine (13) is fixedly connected with a fixed block (14), the inside of the fixed block (14) is fixedly connected with a gas valve group (15), the top of the combustion machine (13) is fixedly connected with a support pipe (16), and the other end of the support pipe (16) is fixedly connected to the outer side of the air preheating device (5).

7. The energy-saving and low-carbon combustion heat recovery heat exchanger according to claim 3, characterized in that: The top left side of the boiler (3) is fixedly connected with a plurality of connecting rods (26), the top right side of the boiler (3) is fixedly connected with a plurality of valves (25), and the rear side of the boiler (3) is fixedly connected with a control panel (27).

8. The energy-saving, low-carbon combustion heat recovery heat exchanger according to claim 1, characterized in that: The outer side of the butt joint pipe (11) is fixedly connected with a spraying device (28), and the outer bottom end of the spraying device (28) is fixedly connected to the top left side of the bottom plate (1).

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