Gas-fired boiler vehicle capable of recycling waste heat of tail gas

Abstract

A gas-fired boiler vehicle capable of recycling tail gas waste heat comprises a vehicle body and a control system, a combustor is installed on one side of the front end of the vehicle body, a fuel supply system is installed at the tail of the vehicle body, a ventilation system is further installed at the tail of the vehicle body, a water supply system is installed on the other side of the front end of the vehicle body, and a first-stage waste heat recycling system is installed in the middle of the vehicle body. The first-stage waste heat recovery system recovers high-temperature tail gas exhausted by the combustor to preheat air and fuel gas and pre-mix the air and the fuel gas, and the second-stage waste heat recovery system continues to recover the tail gas exhausted by the first-stage waste heat recovery system to preheat water in the water tank. High-temperature tail gas exhausted by the combustor is recycled to preheat air and fuel gas, molecular movement of the preheated air and fuel gas is intensified, the preheated air and fuel gas can be better mixed, the temperature of the preheated mixed gas is increased, the reaction rate is increased, the combustion efficiency is improved, a water supply system is preheated, and fuel gas consumption is reduced.

Description

Technical Field

[0001] This application relates to the technical field of boiler trucks, and particularly to a gas boiler truck for recovering and utilizing waste heat from exhaust gas. Background Art

[0002] A gas boiler uses natural gas as fuel. The heat released by combustion in the furnace heats the water in the boiler and vaporizes it into steam, which is a heat energy conversion device. The water in the boiler is continuously heated by the energy released by the combustion of gaseous fuel in the furnace, and its temperature rises to produce pressurized steam. Gas boiler trucks are widely used in many fields such as industrial production, emergency rescue, and heating, providing convenient heat energy supply for various scenarios.

[0003] However, the high-temperature exhaust gas generated during the operation of a gas boiler truck carries a large amount of waste heat. If directly discharged into the air, it will not only cause a huge waste of energy but also produce thermal pollution to the environment. Summary of the Invention

[0004] In view of the above-mentioned prior art, this application aims to provide a gas boiler truck for recovering and utilizing waste heat from exhaust gas, which recovers the high-temperature exhaust gas discharged from the burner to preheat air and gas. After preheating, the molecular motion of air and gas intensifies, enabling better mixing. The temperature of the preheated mixed gas rises, accelerating the reaction rate, reducing gas consumption. The exhaust gas after passing through the primary waste heat recovery system passes through the heat transfer tubes in the water tank to heat the water supply, enabling the water in the burner to reach the evaporation point faster and saving energy.

[0005] To achieve the above object, the technical solution of the embodiment of the present invention is realized as follows:

[0006] A gas boiler truck for recovering and utilizing waste heat from exhaust gas includes a vehicle body and a control system. A burner is installed on one side of the front end of the vehicle body, and a fuel supply system is installed at the tail of the vehicle body to supply gas to the burner. A ventilation system is also installed at the tail of the vehicle body to supply air to the burner. A water supply system is installed on the other side of the front end of the vehicle body to supply water source to the burner. A primary waste heat recovery system is installed in the middle of the vehicle body. The primary waste heat recovery system recovers the high-temperature exhaust gas discharged from the burner to preheat air and gas and premixes air and gas. The exhaust port of the primary waste heat recovery system is connected to a secondary waste heat recovery system, and the secondary waste heat recovery system continues to recover the exhaust gas discharged from the primary waste heat recovery system to preheat the water in the water tank.

[0007] Further, the primary waste heat recovery system includes a box body. An isolation plate is arranged inside the box body to isolate the box body into a preheating chamber and a premixing chamber. A flue gas inlet pipe is arranged on one side wall of the preheating chamber, and the flue gas inlet pipe is communicated with the exhaust flue of the burner. A flue gas outlet pipe is arranged on the side wall of the preheating chamber far from the flue gas inlet pipe, and the flue gas outlet pipe is connected to the secondary waste heat recovery system. A number of hollow tube bundles are arranged inside the preheating chamber. The axial direction of the tube bundles is perpendicular to the flow direction of the high-temperature tail gas inside the preheating chamber. One end of the tube bundles penetrates through the other outer wall of the preheating chamber and is fixedly connected to the preheating chamber, and the other end of the tube bundles penetrates through the isolation plate and is fixedly connected to the isolation plate. The inlet ends of some of the tube bundles are connected to the air delivery end of the ventilation system through the main air pipe, and the inlet ends of the other part of the tube bundles are connected to the fuel supply system through the main gas pipe. The premixing chamber mixes the air and gas flowing out of the tube bundles, and the air outlet of the premixing chamber is communicated with the combustion device in the burner.

[0008] Further, a number of tube bundles are arranged in several columns, and the air inlets of each column of tube bundles are communicated through branch pipes. One end of the main air pipe far from the ventilation system is connected with a number of air sub-pipes, and one end of the main gas pipe far from the fuel supply system is connected with a number of gas sub-pipes. The adjacent branch pipes are respectively connected with the air sub-pipes and the gas sub-pipes.

[0009] Further, the secondary waste heat recovery system includes heat transfer pipes, and the heat transfer pipes are spiral hollow pipes. The water supply system includes a water tank, and the heat transfer pipes are installed inside the water tank. The inlet of the heat transfer pipes is connected to the flue gas outlet pipe, and the outlet of the heat transfer pipes penetrates through the top of the water tank to discharge the flue gas.

[0010] Further, a dust cleaning mechanism is arranged on the outer wall of the tube bundles inside the preheating chamber for cleaning the dust on the outer wall of the tube bundles. The dust cleaning mechanism includes a reciprocating lead screw. One end of the reciprocating lead screw is rotatably connected to the isolation plate, and the other end of the reciprocating lead screw penetrates through the side wall of the preheating chamber and is rotatably connected to the side wall. A motor is fixedly connected to the outer wall of the preheating chamber, and the end of the reciprocating lead screw penetrating through the side wall of the preheating chamber is connected to the output end of the motor. The axis of the reciprocating lead screw is parallel to the axis of the tube bundles. A movable block is threadedly connected to the reciprocating lead screw. A limiting rod is fixedly connected to the inner wall of the preheating chamber, and the limiting rod penetrates through the movable block and is slidably connected to the movable block. A scraper is fixedly connected to the movable block. A number of hole grooves are formed in the scraper, and the hole grooves are adapted to the size and position of the tube bundles. A buffer layer is covered on the part of the scraper in contact with the tube bundles.

[0011] Further, a perforated plate is arranged on one side of the preheating chamber close to the flue gas inlet pipe to shunt the incoming high-temperature tail gas.

[0012] Further, a number of baffle plates are arranged inside the premixing chamber, and the baffle plates are distributed in a staggered manner.

[0013] Furthermore, flow valves are provided on both the air sub-pipe and the gas sub-pipe. The flow valves are used to control the gas flow in each branch pipe to adapt to the temperature changes in the front and rear stages of the high-temperature tail gas flow direction in the preheating chamber.

[0014] Furthermore, several tube bundles are arranged in a staggered manner to continuously change the flow direction of the high-temperature tail gas in the preheating chamber.

[0015] Furthermore, an air buffer chamber is provided on the main air pipe, and a gas buffer chamber is provided on the main gas pipe. Heating tubes are provided in both the air buffer chamber and the gas buffer chamber.

[0016] The beneficial effects of the present invention are as follows: The high-temperature tail gas discharged from the burner is recovered to preheat the air and gas. After preheating, the molecular motion of the air and gas is intensified, and they can be better mixed. The temperature of the preheated mixed gas increases, the reaction rate is accelerated, the gas consumption can be reduced, and the tail gas after passing through the primary waste heat recovery system is passed through the heat transfer tubes in the water tank to heat the water supply, so that the water in the burner can reach the evaporation point faster, saving energy.

[0017] The preheating chamber and the premixing chamber are integrally designed. The high-temperature tail gas passes through the preheating chamber to heat the tube bundles in the preheating chamber. The air and gas respectively enter the premixing chamber through some tube bundles, and the air and gas are preheated at the same time. During the preheating process, the non-combustible high-temperature tail gas fills the space between the tube bundles through which the air flows and the tube bundles through which the gas flows, ensuring the safety of the device. The preheated air and gas enter the premixing chamber from the tube bundles, are fully mixed, ensuring full combustion in the burner subsequently, reducing incomplete combustion products, and reducing pollutant emissions.

[0018] The tube bundles in the preheating chamber are arranged in several columns, and each column of tube bundles is connected through a branch pipe. The adjacent branch pipes respectively conduct air and gas, so that the gas adjacent to the outlet of each column of tube bundles in the premixing chamber is air, making the air and gas in the premixing chamber evenly dispersed, facilitating mixing, and improving the premixing speed.

[0019] A scraper is provided in the premixing chamber. The scraper is periodically started to scrape the dust on the outer wall of the tube bundle, ensuring the heat conduction efficiency of the tube bundle in the premixing chamber, improving the utilization rate of the high-temperature tail gas, and ensuring that the preheating temperatures of the gas and air reach the standard.

[0020] Flow valves are provided on the air sub-pipe and the gas sub-pipe. The high-temperature tail gas in the preheating chamber gradually decreases in temperature from the flue gas inlet pipe to the flue gas outlet pipe. The flow valves are adjusted to control the air and gas flow in each branch pipe. In the tube bundles close to the flue gas inlet pipe, the air and gas flow can be increased, and in the tube bundles close to the flue gas outlet pipe, the air and gas flow can be reduced, which can not only make full use of the heat of the high-temperature tail gas but also ensure the preheating effect of the air and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a gas boiler truck for recovering and utilizing waste heat from tail gas according to the present invention;

[0022] Figure 2 Schematic diagram of the primary waste heat recovery system according to the present invention;

[0023] Figure 3 Schematic diagram of the secondary waste heat recovery system according to the present invention;

[0024] Figure 4 Schematic diagram of the ash cleaning mechanism of a gas boiler truck for recovering and utilizing waste heat from tail gas according to the present invention;

[0025] Figure 5 Schematic diagram of the staggered arrangement of tube bundles according to the present invention;

[0026] Figure 6 Schematic diagram of a gas boiler truck for recovering and utilizing waste heat from tail gas according to the present invention.

[0027] Explanation of reference numerals in the drawings: 1, vehicle body; 2, control system; 3, fuel supply system; 4, water supply system; 5, primary waste heat recovery system; 6, secondary waste heat recovery system; 7, burner; 8, water tank; 9, heat transfer tube; 10, preheating chamber; 11, premixing chamber; 12, flue gas inlet pipe; 13, flue gas outlet pipe; 14, tube bundle; 15, limiting rod; 16, perforated plate; 17, baffle plate; 18, main air pipe; 19, main gas pipe; 20, auxiliary air pipe; 21, auxiliary gas pipe; 22, flow valve; 23, isolation plate; 24, hole groove; 25, branch pipe; 26, ventilation system; 27, air buffer chamber; 28, gas buffer chamber; 29, motor; 30, reciprocating lead screw; 31, movable block; 32, scraper. Detailed implementation manners

[0028] The technical solution of the present invention will be further elaborated in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, the expression "some embodiments" describes a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0029] With reference to the attached Figures 1 to 6, the present invention provides a gas boiler vehicle for waste heat recovery and utilization of exhaust gas, which includes a vehicle body 1 and a control system 2. A burner 7 is installed on one side of the front end of the vehicle body 1. A fuel supply system 3 is installed at the tail of the vehicle body 1 to supply gas to the burner 7. A ventilation system 26 is also installed at the tail of the vehicle body 1 to supply air to the burner 7. A water supply system 4 is installed on the other side of the front end of the vehicle body 1 to supply water source to the burner 7. A primary waste heat recovery system 5 is installed in the middle of the vehicle body 1. The primary waste heat recovery system 5 recovers the high-temperature exhaust gas discharged from the burner 7 to preheat air and gas and premix air and gas. The exhaust port of the primary waste heat recovery system 5 is connected to a secondary waste heat recovery system 6. The secondary waste heat recovery system 6 continues to recover the exhaust gas discharged from the primary waste heat recovery system 5 to preheat the water in the water tank 8. The fuel supply system 3 mainly includes a bracket for clamping and fixing a gas cylinder. The gas flowing out of the gas cylinder enters the primary waste heat recovery system 5 after being decompressed by a decompression device. The ventilation system 26 mainly includes a fan. The air inhaled by the fan enters the primary waste heat recovery system 5. Air and gas are simultaneously preheated and premixed in the primary waste heat recovery system 5 and can burn fully and rapidly after entering the burner 7. The high-temperature gas generated by combustion heats the water in the burner 7 to raise the temperature. The high-temperature exhaust gas discharged from the flue of the burner 7 is connected to the primary waste heat recovery system 5 through a pipeline. The previously generated high-temperature exhaust gas preheats and premixes the subsequent air and gas, improves the combustion efficiency of the gas, reduces incomplete combustion products, and reduces pollution emissions. The exhaust gas flowing out of the primary waste heat recovery system 5 still has a relatively high temperature and is used to raise the temperature of the water in the water supply system 4, so that the water entering the burner 7 can reach the evaporation point faster and save energy.

[0030] Preferably, the primary waste heat recovery system 5 includes a box body, in which an isolation plate 23 is provided to separate the box body into a preheating chamber 10 and a premixing chamber 11, a flue gas inlet pipe 12 is provided on one side wall of the preheating chamber 10, and the flue gas inlet pipe 12 is connected to the exhaust flue of the burner 7, a flue gas outlet pipe 13 is provided on the side wall of the preheating chamber 10 away from the flue gas inlet pipe 12, and the flue gas outlet pipe 13 is connected to the secondary waste heat recovery system 6, and a plurality of hollow tube bundles 14 are provided in the preheating chamber 10, and the axial direction of the tube bundle 14 is perpendicular to the high temperature tail gas in the preheating chamber 10. In terms of the flow direction of the gas, one end of the tube bundle 14 passes through the other outer wall of the preheating chamber 10 and is fixedly connected to the preheating chamber 10, and the other end of the tube bundle 14 passes through the isolation plate 23 and is fixedly connected to the isolation plate 23. The inlet end of a part of the tube bundle 14 is connected to the gas delivery end of the ventilation system 26 through the air pipe 18, and the inlet end of the other part of the tube bundle 14 is connected to the fuel supply system 3 through the gas pipe 19. The premixing chamber 11 mixes the air and gas flowing out of the tube bundle 14, and the gas outlet of the premixing chamber 11 is connected to the combustion device in the burner 7. High-temperature exhaust gas enters from the flue gas inlet pipe 12 of the preheating chamber 10 and flows out from the flue gas outlet pipe 13 of the preheating chamber 10. In this process, all gases flowing through the tube bundle 14 are heated. The decompressed fuel gas and air enter different tube bundles 14 respectively to achieve simultaneous preheating. They enter the preheating chamber from different tube bundles 14. The space between adjacent tube bundles 14 is filled with high-temperature exhaust gas. The high-temperature exhaust gas is non-flammable, which ensures the safety of the preheating process. The preheated air and fuel gas enter the premixing chamber 11 from the tube bundle 14. The preheated air and fuel gas can be mixed faster. The preheated and fully mixed gas enters the burner 7, which can be fully burned with high combustion efficiency. The air and fuel gas are preheated at the same time, and the equipment occupies a small space.

[0031] Preferably, the plurality of tube bundles 14 are arranged in a plurality of rows, the air inlets of each row of tube bundles 14 are connected via branch pipes 25, the end of the air main pipe 18 away from the ventilation system 26 is connected to a plurality of air subsidiary pipes 20, the end of the gas main pipe 19 away from the fuel supply system 3 is connected to a plurality of gas subsidiary pipes 21, and adjacent branch pipes 25 are respectively connected to the air subsidiary pipes 20 and the gas subsidiary pipes 21. The air and gas are divided into several groups, and enter the tube bundle 14 from a plurality of air auxiliary pipes 20 and gas auxiliary pipes 21 respectively, so that air flows through one row of tube bundles 14, and gas flows through an adjacent row of tube bundles 14. When the gas flows through the tube bundles 14 and enters the premixing chamber 11, air and gas flow out of the left and right adjacent tube bundles 14 respectively, which is conducive to the rapid mixing of air and gas in the premixing chamber 11, which can ensure the preheating of air and gas and facilitate the premixing of air and gas. If the tube bundles 14 through which the air and gas flow are completely staggered, the pipeline connection is complicated. If the tube bundles 14 through which the air and gas flow are arranged together according to the position, the mixing effect of the air and gas entering the premixing chamber 11 is poor. The tube bundles 14 through which the air and gas flow are arranged separately by row can effectively solve the problems existing in the two, and the effect is good.

[0032] Preferably, the secondary waste heat recovery system 6 includes a heat transfer tube 9 which is a spiral hollow tube. The water supply system 4 includes a water tank 8. The heat transfer tube 9 is installed inside the water tank 8. The inlet of the heat transfer tube 9 is connected to the flue gas outlet pipe 13, and the outlet of the heat transfer tube 9 penetrates through the top of the water tank 8 to discharge the flue gas. The heat transfer tube 9 in the water tank 8 is a spiral hollow tube, which prolongs the time for the secondary tail gas to flow through the water tank 8 and makes full use of the waste heat of the tail gas to heat the water in the water tank 8.

[0033] Preferably, a dust cleaning mechanism is provided on the outer wall of the tube bundle 14 in the preheating chamber 10 for cleaning the dust on the outer wall of the tube bundle 14. The dust cleaning mechanism includes a reciprocating lead screw 30. One end of the reciprocating lead screw 30 is rotatably connected to the partition plate 23, and the other end of the reciprocating lead screw 30 penetrates through the side wall of the preheating chamber 10 and is rotatably connected to the side wall. A motor 29 is fixedly connected to the outer wall of the preheating chamber 10. The end of the reciprocating lead screw 30 penetrating through the side wall of the preheating chamber 10 is connected to the output end of the motor 29. The axis of the reciprocating lead screw 30 is parallel to the axis of the tube bundle 14. A movable block 31 is threadedly connected to the reciprocating lead screw 30. A limiting rod 15 is fixedly connected to the inner wall of the preheating chamber 10. The limiting rod 15 penetrates through the movable block 31 and is slidably connected to the movable block 31. A scraping plate 32 is fixedly connected to the movable block 31. A plurality of holes 24 are formed in the scraping plate 32. The size and position of the holes 24 are adapted to the size and position of the tube bundle 14. A buffer layer is covered on the part of the scraping plate 32 in contact with the tube bundle 14. After a long time, impurities carried by the air and particles generated by combustion adhere to the outer wall of the tube bundle 14 to form a heat insulation layer, which is not conducive to the high-temperature tail gas transferring heat to the gas in the tube bundle 14. Therefore, the motor 29 is started regularly to drive the reciprocating lead screw 30 to rotate. The movable block 31 on the reciprocating lead screw 30 reciprocates along the length direction of the tube bundle 14. The movable block 31 is connected to the scraping plate 32. The position of the holes 24 on the scraping plate 32 is consistent with the position of the tube bundle. The size of the holes 24 is slightly larger than the size of the outer wall of the tube bundle 14. The dust on the outer wall of the tube bundle 14 is continuously scraped off. A buffer layer is covered on the part of the scraping plate 32 in contact with the tube bundle 14, which effectively reduces the damage to the tube bundle 14. The buffer layer can be ceramic fiber, high-temperature resistant rubber, etc. It has soft performance to reduce the damage to the tube bundle 14 and can also adapt to the temperature of the high-temperature tail gas without being deformed by heat itself.

[0034] Preferably, a perforated plate 16 is provided on one side of the preheating chamber 10 close to the flue gas inlet pipe 12 to split the incoming high-temperature tail gas. The high-temperature tail gas entering from the flue gas inlet pipe 12 enters the preheating chamber 10. After passing through the perforated plate 16, it flows uniformly from the entire cross-section to the flue gas outlet pipe 13, ensuring that all the tube bundles 14 in the preheating chamber 10 can fully exchange heat, and the air and gas in the tube bundles 14 can be fully preheated.

[0035] Preferably, a plurality of baffle plates 17 are arranged in the premixing chamber 11, and the baffle plates 17 are staggered. The air and gas flowing out from the tube bundle 14 pass through the baffle plates 17, intensifying the gas disturbance, ensuring the full mixing of the air and gas in the premixing chamber 11, and avoiding incomplete combustion of some gas.

[0036] Preferably, flow valves 22 are arranged on both the air sub-pipe 20 and the gas sub-pipe 21. The flow valves 22 are used to control the gas flow in each branch pipe 25 to adapt to the temperature change in the front and back stages of the flow direction of the high-temperature tail gas in the preheating chamber 10. The high-temperature tail gas gradually decreases in temperature from the flue gas inlet pipe 12 to the flue gas outlet pipe 13 in the preheating chamber 10. Temperature detection devices are respectively arranged at the flue gas inlet pipe 12 and the flue gas outlet pipe 13, and the temperature change is transmitted to the control system 2 to adjust the flow valves 22 and control the flow of air and gas in each branch pipe 25. In the tube bundle 14 close to the flue gas inlet pipe 12, the flow of air and gas can be increased, and in the tube bundle 14 close to the flue gas outlet pipe 13, the flow of air and gas can be decreased. This can not only make full use of the heat of the high-temperature tail gas but also ensure the preheating effect of air and gas, so that the air and gas passing through the preheating chamber 10 are both preheated to an appropriate temperature.

[0037] Preferably, several tube bundles 14 are arranged in a staggered pattern to continuously change the flow direction of the high-temperature tail gas in the preheating chamber 10. The flow of the high-temperature tail gas between the tube bundles 14 is more complex, and the fluid can more fully wash the surface of the tube bundle 14, reducing the flow dead zone, thereby enhancing the heat transfer effect.

[0038] Preferably, an air buffer chamber 27 is arranged on the main air pipe 18, and a gas buffer chamber 28 is arranged on the main gas pipe 19. Heating tubes are arranged in both the air buffer chamber 27 and the gas buffer chamber 28. In the startup stage of the gas boiler truck, there is no high-temperature tail gas to preheat the gas and air. At this time, the heating tubes in the air buffer chamber 27 and the gas buffer chamber 28 are used to preheat the air and gas. The preheated air and gas enter the premixing chamber from different tube bundles 14 respectively and are fully mixed. At the same time, the air buffer chamber 27 and the gas buffer chamber 28 also help to stabilize the entry of air and gas into the preheating chamber 10.

[0039] Working principle: During the startup phase of the boiler truck, the depressurized gas enters the gas buffer chamber 28, and the air enters the air buffer chamber 27. The control system 2 controls the heating tubes to preheat the gases in the air buffer chamber 27 and the gas buffer chamber 28, improving the combustion efficiency of the gas. The preheated air and gas enter the preheating chamber 10 from different tube bundles 14 respectively, and enter the premixing chamber 11 from the outlets of different tube bundles 14, facilitating the mixing of air and gas. The mixed gas enters the burner 7, and the fully mixed and heated gas greatly improves the combustion efficiency. The high-temperature exhaust gas discharged from the burner 7 enters the preheating chamber 10 through the flue gas inlet pipe 12. After the temperature in the preheating chamber 10 stabilizes, the heating tubes are turned off, and the high-temperature exhaust gas entering the preheating chamber 10 is used to preheat the subsequent air and gas and mix them in the premixing chamber, which not only improves the combustion efficiency of the gas but also utilizes the energy in the high-temperature exhaust gas. The secondary exhaust gas flowing out from the flue gas outlet pipe 13 enters the heat transfer tubes 9 in the water tank 8 to preheat and raise the temperature of the water in the water tank 8, enabling the water entering the burner 7 to be converted into steam faster and saving gas consumption.

[0040] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the said claims.

Claims

1. A gas boiler vehicle for waste heat recovery and utilization of tail gas, comprising a vehicle body (1) and a control system (2). A burner (7) is installed on one side of the front end of the vehicle body (1). It is characterized in that: A fuel supply system (3) is installed at the tail of the vehicle body (1) to supply gas to the burner (7), a ventilation system (26) is also installed at the tail of the vehicle body (1) to supply air to the burner (7), a water supply system (4) is installed on the other side of the front end of the vehicle body (1) to supply water source to the burner (7), a primary waste heat recovery system (5) is installed in the middle of the vehicle body (1), and the primary waste heat recovery system (5) recovers the high-temperature exhaust gas discharged from the burner (7) to preheat the air and gas and premix the air and gas. The exhaust port of the primary waste heat recovery system (5) is connected to a secondary waste heat recovery system (6), and the secondary waste heat recovery system (6) continues to recover the exhaust gas discharged from the primary waste heat recovery system (5) to preheat the water in the water tank (8).

2. The gas boiler truck for waste heat recovery and utilization according to claim 1, characterized in that: The primary waste heat recovery system (5) includes a box body. A partition plate (23) is arranged in the box body to isolate the box body into a preheating chamber (10) and a premixing chamber (11). A flue gas inlet pipe (12) is arranged on one side wall of the preheating chamber (10), and the flue gas inlet pipe (12) is communicated with the exhaust flue of the burner (7). A flue gas outlet pipe (13) is arranged on the side wall of the preheating chamber (10) far away from the flue gas inlet pipe (12), and the flue gas outlet pipe (13) is connected with the secondary waste heat recovery system (6). A plurality of hollow tube bundles (14) are arranged in the preheating chamber (10), the axial direction of the tube bundles (14) is perpendicular to the flow direction of the high-temperature exhaust gas in the preheating chamber (10), one end of the tube bundles (14) penetrates through the other outer wall of the preheating chamber (10) and is fixedly connected with the preheating chamber (10), the other end of the tube bundles (14) penetrates through the partition plate (23) and is fixedly connected with the partition plate (23). The inlet ends of some of the tube bundles (14) are connected with the air delivery end of the ventilation system (26) through an air main pipe (18), and the inlet ends of the other part of the tube bundles (14) are connected with the fuel supply system (3) through a gas main pipe (19). The premixing chamber (11) mixes the air and gas flowing out of the tube bundles (14), and the air outlet of the premixing chamber (11) is communicated with the combustion device in the burner (7).

3. A gas boiler truck for waste heat recovery and utilization of tail gas according to claim 2, characterized in that: The plurality of tube bundles (14) are arranged in several columns, the air inlets of each column of tube bundles (14) are communicated through branch pipes (25). One end of the air main pipe (18) far away from the ventilation system (26) is connected with a plurality of air sub-pipes (20), one end of the gas main pipe (19) far away from the fuel supply system (3) is connected with a plurality of gas sub-pipes (21), and the adjacent branch pipes (25) are respectively connected with the air sub-pipes (20) and the gas sub-pipes (21).

4. A gas boiler truck for waste heat recovery and utilization according to claim 2, characterized in that: The secondary waste heat recovery system (6) includes a heat transfer pipe (9), the heat transfer pipe (9) is a spiral hollow pipe, the water supply system (4) includes a water tank (8), the heat transfer pipe (9) is installed in the water tank (8), the inlet of the heat transfer pipe (9) is connected with the flue gas outlet pipe (13), and the outlet of the heat transfer pipe (9) penetrates through the top of the water tank (8) to discharge the flue gas.

5. A gas boiler truck for waste heat recovery and utilization of exhaust gas according to claim 3, characterized in that: A dust cleaning mechanism is provided on the outer wall of the tube bundle (14) in the preheating chamber (10) for cleaning the ash accumulated on the outer wall of the tube bundle (14). The dust cleaning mechanism includes a reciprocating lead screw (30). One end of the reciprocating lead screw (30) is rotatably connected to the partition plate (23), and the other end of the reciprocating lead screw (30) penetrates through the side wall of the preheating chamber (10) and is rotatably connected to the side wall. A motor (29) is fixedly connected to the outer wall of the preheating chamber (10), and the end of the reciprocating lead screw (30) penetrating through the side wall of the preheating chamber (10) is connected to the output end of the motor (29). The axis of the reciprocating lead screw (30) is parallel to the axis of the tube bundle (14). A movable block (31) is threadedly connected to the reciprocating lead screw (30). A limiting rod (15) is fixedly connected to the inner wall of the preheating chamber (10). The limiting rod (15) penetrates through the movable block (31) and is slidably connected to the movable block (31). A scraping plate (32) is fixedly connected to the movable block (31). A plurality of hole grooves (24) are formed in the scraping plate (32). The hole grooves (24) are adapted to the size and position of the tube bundle (14). A buffer layer covers the part of the scraping plate (32) in contact with the tube bundle (14).

6. A gas boiler truck for waste heat recovery and utilization according to claim 2, characterized in that: A perforated plate (16) is provided on one side of the preheating chamber (10) near the flue gas inlet pipe (12) to split the incoming high-temperature tail gas.

7. A gas boiler vehicle for waste heat recovery and utilization of tail gas according to claim 2, characterized in that: A plurality of baffle plates (17) are provided in the premixing chamber (11), and the baffle plates (17) are staggered.

8. A gas boiler truck for waste heat recovery and utilization of tail gas according to claim 3, characterized in that: Flow valves (22) are provided on both the air sub-pipe (20) and the gas sub-pipe (21). The flow valves (22) are used to control the gas flow in each branch pipe (25) to adapt to the temperature change in the front and back stages of the flow direction of the high-temperature tail gas in the preheating chamber (10).

9. A gas boiler truck for waste heat recovery and utilization of tail gas according to claim 3, characterized in that: The plurality of tube bundles (14) are arranged in a staggered manner to continuously change the flow direction of the high-temperature tail gas in the preheating chamber (10).

10. A gas boiler truck for waste heat recovery and utilization of tail gas according to claim 2, characterized in that: An air buffer chamber (27) is provided on the air main pipe (18), and a gas buffer chamber (28) is provided on the gas main pipe (19). Heating tubes are provided in both the air buffer chamber (27) and the gas buffer chamber (28).

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