Steam-driven two-stroke engine system based on multiphase fuel heating

Abstract

The invention relates to the technical field of power engineering and energy recovery, and discloses a two-stroke engine system based on multiphase fuel heating steam driving. Through cooperative linkage of the multi-phase fuel combustion unit, the steam engine and the waste heat recovery module, a'combustion-steam-waste heat-resource 'closed-loop circulation system is constructed; specifically, the multiphase fuel combustion unit is compatible with solid, gas and liquid fuel, directly heats water supply to generate steam to drive an air cylinder, and the fuel adaptability is improved; waste gas of the steam engine exchanges heat with air through the preheating recovery unit, condensate water is recycled, and preheated air is used for supporting combustion to improve the combustion efficiency. Combustion flue gas is used for preheating water supply through a snake-shaped flue, so that waste heat cascade recovery is realized; ash granulation, waste gas filtration and water circulation technologies are integrated, pollutant emission reduction is achieved, heat energy, water and gas closed-loop regeneration is formed, efficiency and environmental protection optimization are considered while energy consumption is reduced, and the system is suitable for high-energy-efficiency power scenes such as ships and power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of power engineering and energy recovery, and specifically to a two-stroke engine system driven by multi-phase fuel heating steam. Background Art

[0002] A steam power system is an energy conversion system that converts thermal energy into mechanical energy or electrical energy, and its core working medium is water vapor (or steam of other substances); while existing steam power systems mostly use a single fuel to drive a boiler to generate steam, and generally have defects such as low waste heat recovery rate, insufficient steam generation efficiency, and serious water resource waste. In the whole process of thermal energy conversion, a large amount of thermal energy will be wasted, which is neither environmentally friendly nor energy-saving. Therefore, a two-stroke engine system driven by multi-phase fuel heating steam is proposed. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a two-stroke engine system driven by multi-phase fuel heating steam to solve the problems in the background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A two-stroke engine system driven by multi-phase fuel heating steam, comprising:

[0005] A multi-phase fuel combustion unit for burning fuel to generate heat;

[0006] A water supply unit extends through a pipeline into the multi-phase fuel combustion unit to supply water, and the multi-phase fuel combustion unit evaporates the water;

[0007] A smoke heat recovery unit for recovering the flue gas generated by combustion in the multi-phase fuel combustion unit and preheating the water in the water supply pipeline of the water supply unit;

[0008] A steam engine that receives the steam evaporated from water by the multi-phase fuel combustion unit to perform cylinder work;

[0009] A preheating recovery air combustion support unit receives the steam discharged from the steam engine unit, condenses and recovers the steam through air convection, and the heated air enters the multi-phase fuel combustion unit for combustion support.

[0010] Preferably, the multi-phase fuel combustion unit includes a solid fuel feeding bucket, in which a gas fuel supply pipe, a liquid fuel supply pipe and an ash falling net are provided. The liquid fuel supply pipe is spirally arranged on the inner wall of the solid fuel feeding bucket. A smoke exhaust port and an openable feeding port are provided at the upper end of the solid fuel feeding bucket. A steam chamber is installed in the multi-phase fuel combustion unit, and a steam pipe communicating with the input end of the steam engine is provided on the steam chamber;

[0011] The preheating and recycling air combustion assisting unit adds air for combustion assistance into the solid fuel feeding bucket; the smoke heat recovery unit is communicated with the smoke exhaust port; the pipeline of the water supply unit extends into the solid fuel feeding bucket and is communicated with the steam chamber.

[0012] Preferably, a dust blocking net is installed in the smoke exhaust port to prevent the dust in the solid fuel feeding bucket from entering the smoke heat recovery unit.

[0013] Preferably, a screw extrusion granulator is installed at the lower end of the solid fuel feeding bucket to extrude and granulate the burning dust for recycling.

[0014] Preferably, the water supply unit includes a water supply tank and a water pump. A water filling port is provided on the water supply tank. The water pump pumps the water in the water supply tank. A heating water pipe is installed at the output end of the water pump. The heating water pipe passes through the smoke heat recovery unit and enters the solid fuel feeding bucket along the smoke exhaust port, spirally arranged on the inner wall of the solid fuel feeding bucket, and finally communicated with the steam chamber.

[0015] Preferably, the smoke heat recovery unit includes a flue communicated with the smoke exhaust port. A flue gas filter is installed at the smoke outlet end of the flue. One end of the heating water pipe passes through to the flue.

[0016] Preferably, a plurality of partition plates are provided in the flue. The partition plates divide the internal space of the flue into a serpentine channel, and the heating water pipe is arranged along the serpentine channel inside the flue.

[0017] Preferably, through the division of the partition plates, the inlet diameter of the flue is larger than the outlet diameter.

[0018] Preferably, the steam engine includes an engine body. An air inlet and an air outlet communicated with the cylinder are provided on the engine body. A crankshaft and two camshafts rotate in the engine body. The cams of the camshafts are in a rhombus structure. A crank is rotatably connected to the crankshaft. The upper end of the crank is rotatably connected to a piston that slides on the inner wall of the cylinder. A plurality of sliding rods are slidably connected to the engine body. A valve is fixedly connected to the lower end of the sliding rod. A plurality of valves respectively open and close the air inlet and the air outlet. The other end of the sliding rod is fixedly connected to a pressing block that cooperates with the camshaft. A retaining piece located outside the engine body is fixedly connected to the outer wall of the sliding rod. A spring that abuts against the retaining piece and the engine body is sleeved on the outer wall of the sliding rod. The camshaft presses the pressing block movably. A passive sprocket is installed at one end of the camshaft. An active sprocket is installed at one end of the crankshaft. A timing chain is meshed between the active sprocket and the passive sprocket. The transmission ratio driven by the active sprocket and the passive sprocket through the timing chain is 2:1;

[0019] The air outlet is communicated with the preheating and recycling air combustion assisting unit; the steam pipe is communicated with the air inlet and conveys steam into it.

[0020] Preferably, the preheating and waste heat recovery air combustion assisting unit includes a heat exchange channel in a serpentine structure. One end of the heat exchange channel is equipped with a blower for conveying air into it. A water return pipe is installed in the heat exchange channel. One end of the water return pipe is communicated with a water supply tank. The water return pipe is laid along the inside of the heat exchange channel, and the number of pipe sections of the water return pipe gradually increases towards the end away from the blower. The other end of the heat exchange channel is equipped with an exhaust pipe and a heat return pipe communicated with the end of the water return pipe with more pipe sections. The other end of the heat return pipe is communicated with the air outlet and receives the waste gas discharged from the air outlet. The water return pipe recovers the condensed water in the waste gas. The other end of the exhaust pipe is communicated with the inside of the solid fuel feeding bucket for supplying combustion air.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Through the collaborative design of the multiphase fuel combustion unit, the water supply unit, the steam engine, the preheating and waste heat recovery air combustion assisting unit and the smoke heat recovery unit, the present invention constructs a "combustion - steam drive - waste heat recovery - resource circulation" closed - loop system. The multiphase fuel combustion unit is compatible with solid, gas and liquid fuels, heats the water supplied by the water supply unit to generate steam to drive the cylinder to do work, and significantly improves the fuel adaptability; the waste gas discharged from the steam engine exchanges heat with air through the preheating and waste heat recovery unit, and the condensed water is recovered to the water supply unit for recycling, reducing water consumption. At the same time, the air is preheated for combustion assistance, improving the combustion efficiency; the combustion flue gas preheats the water supply pipeline of the water supply unit through the serpentine flue of the smoke heat recovery unit, realizing the cascade recovery of the waste heat of the flue gas; reducing pollutant emissions, forming a closed - loop cycle of heat energy, water and gas, and optimizing the operation efficiency and environmental protection performance while reducing energy loss.

[0023] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures pointed out in the specification, the claims and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the multiphase fuel combustion unit and the smoke heat recovery unit of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the water supply unit of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the preheating and waste heat recovery air combustion assisting unit of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the steam engine of the present invention;

[0028] Figure 5 It is Figure 4 the schematic diagram of the structure at position A in

[0029] Figure 6 Schematic diagram of the transmission structure between the crankshaft and the camshaft in the steam engine of the present invention.

[0030] In the figure: 1. Multi-phase fuel combustion unit; 11. Solid fuel feeding bucket; 12. Feeding port; 13. Gas fuel supply pipe; 14. Liquid fuel supply pipe; 15. Ash dropping net; 16. Steam chamber; 17. Steam pipe; 18. Ash blocking net; 19. Smoke exhaust port; 120. Screw extrusion granulator; 2. Smoke heat recovery unit; 21. Flue; 22. Flue gas filter; 23. Partition board; 3. Water supply unit; 31. Water supply tank; 32. Water filling port; 33. Water pump; 34. Heating water pipe; 4. Preheating and recovering air for combustion assistance unit; 41. Heat exchange channel; 42. Exhaust pipe; 43. Return heat pipe; 44. Blower; 45. Return water pipe; 5. Steam engine; 51. Engine body; 52. Intake port; 53. Exhaust port; 54. Crankshaft; 55. Crank; 56. Piston; 57. Driving sprocket; 58. Timing chain; 59. Camshaft; 510. Driven sprocket; 511. Retaining plate; 512. Slide bar; 513. Pressing block; 514. Valve; 515. Cylinder. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art in the technical field of the present invention without making creative efforts belong to the protection scope of the present invention.

[0032] Please refer to Figures 1-6 , in the multi-phase fuel heating steam-driven two-stroke engine system of the present invention, it mainly includes the multi-phase fuel combustion unit 1, the smoke heat recovery unit 2, the water supply unit 3, the preheating and recovering air for combustion assistance unit 4, and the steam engine 5 to carry out the cycle of overall heat energy recovery and release, specifically including:

[0033] 1. Multi-phase fuel combustion unit 1

[0034] The solid fuel feeding bucket 11 is provided with an openable and closable feeding port 12 and a smoke exhaust port 19 at the upper end. Inside, a gas fuel supply pipe 13, a liquid fuel supply pipe 14 and an ash falling net 15 are installed. The liquid fuel supply pipe 14 is spirally coiled around the inner wall of the solid fuel feeding bucket 11. A dust blocking net 18 is installed in the smoke exhaust port 19 to block the dust after combustion. The smoke heat recovery unit 2 is communicated with the smoke exhaust port 19, and the dust blocking net 18 prevents dust from entering the smoke heat recovery unit 2. Solid fuel can be put in through the feeding port 12, and natural gas can also be supplied through the gas fuel supply pipe 13 or liquid fuel can be supplied through the liquid fuel supply pipe 14. When the liquid fuel supply pipe 14 transports liquid fuel into the solid fuel feeding bucket 11, the liquid fuel flows along the spiral liquid fuel supply pipe 14. The internal temperature of the solid fuel feeding bucket 11 evaporates the liquid fuel. After the liquid fuel vaporizes, it sprays out from the liquid fuel supply pipe 14 as a combustion material. The ash falling net 15 catches the dust, and the ash is discharged when adding solid fuel. The preheating and recovering air for combustion assisting unit 4 transports air into the solid fuel feeding bucket 11 for combustion assisting.

[0035] The steam chamber 16 is arranged inside the solid fuel feeding bucket 11. The upper end is provided with a steam pipe 17 communicated with the steam engine 5. The pipeline of the water supply unit 3 enters the solid fuel feeding bucket 11 for water supply and is communicated with the steam chamber 16. Combustion occurs inside the solid fuel feeding bucket 11 to heat the pipeline of the water supply unit 3, so that the water in the pipeline is gradually heated and enters the steam chamber 16, and the water evaporates into steam. The steam is transported to the steam engine 5 through the steam pipe 17 to make the steam engine 5 do work.

[0036] The screw extrusion granulator 120 is installed at the lower end of the solid fuel feeding bucket 11. The dust accumulated on the ash falling net 15 is poured into the screw extrusion granulator 120, and the screw extrusion granulator 120 extrudes and granulates the dust for recycling.

[0037] 2. The water supply unit 3

[0038] A water supply tank 31 and a water pump 33 are provided. The water supply tank 31 is provided with a water filling port 32, and the water source in the water supply tank 31 is extracted through the water pump 33.

[0039] The heating water pipe 34 is communicated with the output end of the water pump 33 at one end, passes through the smoke heat recovery unit 2 at the other end, penetrates into the solid fuel feeding bucket 11 along the smoke exhaust port 19, and is spirally coiled around the inner wall of the solid fuel feeding bucket 11 and finally communicated with the steam chamber 16. The inside of the solid fuel feeding bucket 11 is heated for combustion to heat the heating water pipe 34 spirally coiled around the inner wall of the solid fuel feeding bucket 11. The water extracted by the water pump 33 flows along the heating water pipe 34, is heated and then transported into the steam chamber 16 to form steam, and then is transported into the steam engine 5 through the steam pipe 17 to realize the cylinder work.

[0040] 3. Smoke Heat Recovery Unit 2

[0041] Flue 21, which is connected to the smoke exhaust port 19 and is provided with multiple partition plates 23 inside. The internal space of the flue 21 is divided into a serpentine channel. Through the arrangement of the partition plates 23, the diameter of the serpentine channel gradually decreases, and the diameter of the smoke inlet is larger than that of the smoke outlet. The flue gas generated by the combustion in the solid fuel feeding bucket 11 enters the flue 21 through the smoke exhaust port 19 for smoke exhaust;

[0042] Smoke filter 22, which is arranged at the end of the flue 21 to purify and discharge the waste gas;

[0043] The heating water pipe 34 is arranged along the serpentine channel inside the flue 21 and finally enters the solid fuel feeding bucket 11 through the smoke exhaust port 19. The flue gas discharged during the combustion of the solid fuel feeding bucket 11 has a relatively high heat, which can preheat the water in the heating water pipe 34, reduce the temperature of the flue gas, realize heat recovery, reduce heat emission, and improve environmental protection.

[0044] 4. Steam Engine 5

[0045] Engine body 51, which is internally provided with an air inlet 52 and an air outlet 53 that are connected to the cylinder 515. A crankshaft 54 and two camshafts 59 rotate inside the engine body 51. The crankshaft 54 and the two camshafts 59 are in the same space for unified lubrication. The crankshaft 54 and the two camshafts 59 are both located above the cylinder 515. The engine body 51 adopts an inverted structure to facilitate the downward flow of water vapor in the steam and avoid the accumulation of water vapor in the engine body 51. The cams of the camshaft 59 are in a diamond structure. A crank 55 is rotatably connected to the crankshaft 54, and the upper end of the crank 55 is rotatably connected to a piston 56 that slides on the inner wall of the cylinder 515. The steam pipe 17 is connected to the air inlet 52 and conveys steam into it. The steam enters from the air inlet 52 to push the piston 56 in the cylinder 515 to move downward, and the cooperation of the crank 55 drives the crankshaft 54 to rotate. As the piston 56 rises, the steam is discharged from the air outlet 53, and the discharged steam is conveyed to the preheating and recovering air for combustion assistance unit 4.

[0046] The switch control of the air inlet 52 and the air outlet 53 includes the following structure:

[0047] A number of sliding rods 512 are slidably connected to the engine block 51. A valve 514 is fixedly connected to the lower end of the sliding rod 512. A number of valves 514 respectively open and close the air inlet 52 and the air outlet 53. The other end of the sliding rod 512 is fixedly connected to a pressing block 513 that cooperates with the camshaft 59. A retaining piece 511 located outside the engine block 51 is fixedly connected to the outer wall of the sliding rod 512. A spring 515 that abuts against the retaining piece 511 and the engine block 51 is sleeved on the outer wall of the sliding rod 512. The camshaft 59 presses the pressing block 513 movably. A driven sprocket 510 is installed at one end of the camshaft 59. A driving sprocket 57 is installed at one end of the crankshaft 54. A timing chain 58 is meshed and connected between the driving sprocket 57 and the driven sprocket 510. The transmission ratio of the driving sprocket 57 and the driven sprocket 510 driven by the timing chain 58 is 2:1;

[0048] Driven by steam, the crankshaft 54 rotates. The crankshaft 54 drives the driving sprocket 57 to rotate. The driving sprocket 57 drives the driven sprocket 510 to rotate synchronously through the timing chain 58. Then, the two driven sprockets 510 respectively drive the two camshafts 59 to rotate, realizing the transmission between the crankshaft 54 and the camshaft 59;

[0049] The rotating camshaft 59 presses the pressing block 513 movably. The pressing block 513 drives the sliding rod 512 to slide in the engine block 51. The pressing block 513 presses the spring 515 through the retaining piece 511 to compress it. The sliding rod 512 drives the valve 514 to move downward, thereby opening the connection between the air inlet 52 or the air outlet 53 and the cylinder 515. When the camshaft 59 slides past the pressing block 513, through the elasticity of the spring 515, the retaining piece 511 is pushed, so that the sliding rod 512 drives the pressing block 513 to move back, and the valve 514 closes the connection between the air inlet 52 or the air outlet 53 and the cylinder 515, realizing the opening and closing of the air inlet 52 and the air outlet 53;

[0050] The transmission between the crankshaft 54 and the camshaft 59 realizes the opening and closing of the air inlet 52 and the air outlet 53. Specifically:

[0051] When the piston 56 is moving in the cylinder 515 and away from the air inlet 52 and the air outlet 53, the camshaft 59 presses the pressing block 513 corresponding to the air inlet 52, opening the connection between the air inlet 52 and the cylinder 515. At this time, the connection between the air outlet 53 and the cylinder 515 is closed;

[0052] When the piston 56 is moving in the cylinder 515 and approaching the air inlet 52 and the air outlet 53, the camshaft 59 presses the pressing block 513 corresponding to the air outlet 53, opening the connection between the air outlet 53 and the cylinder 515. At this time, the connection between the air inlet 52 and the cylinder 515 is closed;

[0053] For the drive of the steam engine 5, after the piston 56 makes a single downward pressure, exhaust is carried out, and this process repeats, achieving efficient cylinder work in the two-stroke program;

[0054] When the crankshaft 54 rotates one full circle, the piston 56 performs work once. Both camshafts 59 rotate half a circle, causing the intake port 52 and the exhaust port 53 to open once respectively. The transmission ratio between the crankshaft 54 and the camshaft 59 is 2:1, reducing the rotation of the camshaft 59 and thus reducing wear.

[0055] 5. Preheating and Recycling Air Combustion Assistance Unit 4

[0056] The heat exchange channel 41 in a serpentine structure has a blower 44 installed at one end for delivering air into it. Inside, there is a water return pipe 45. One end of the water return pipe 45 is connected to the water supply tank 31. The water return pipe 45 is laid along the inside of the heat exchange channel 41, and the number of pipes of the water return pipe 45 gradually increases towards the end away from the blower 44. At the other end of the heat exchange channel 41, there is an exhaust pipe 42 and a heat return pipe 43 connected to the end of the water return pipe 45 with more pipes. The other end of the heat return pipe 43 is connected to the exhaust port 53 and receives the waste gas discharged from the exhaust port 53. The water return pipe 45 recovers the condensed water in the waste gas;

[0057] Since the waste gas discharged from the steam engine 5 still has a large amount of heat, the waste gas is transported into the water return pipe 45 through the heat return pipe 43. Heat exchange occurs between the air transported into the heat exchange channel 41 by the blower 44 and the steam in the water return pipe 45, thereby reducing the heat of the waste gas. Because the volume of steam is large, the water return pipe 45 has more pipes at the end close to the heat return pipe 43, facilitating rapid heat exchange and simultaneously accommodating the entry of steam. As the steam gradually condenses, the number of pipes of the water return pipe 45 also gradually decreases to adapt to the gradually formed condensed water. The condensed water in the waste gas is finally recovered into the water supply tank 31 through the water return pipe 45, realizing the recycling of water resources and reducing water resource waste;

[0058] The other end of the exhaust pipe 42 is connected to the inside of the solid fuel feeding bucket 11 for supplying combustion air;

[0059] The air transported into the heat exchange channel 41 by the blower 44 is heated and preheated through heat exchange with the steam in the water return pipe 45. The heated and preheated air is transported to the combustion area in the solid fuel feeding bucket 11 for combustion assistance. The preheated air has a better combustion assistance effect and reclaims heat energy again, reducing heat energy waste.

[0060] 6. Summary

[0061] The present invention uses a water supply unit 3 for water supply. The multi-phase fuel combustion unit 1 evaporates the supplied water into steam, and the steam is output to a steam engine 5 to perform cylinder work. The exhaust gas of the steam engine 5 is discharged to a preheating and heat recovery air combustion support unit 4. The preheating and heat recovery air combustion support unit 4 exchanges heat for the heat energy in the exhaust gas through air, condenses the exhaust gas into water and then recovers it to the water supply unit 3 to achieve water resource circulation. At the same time, the exhaust gas heats the air, and the heated air is transported into the multi-phase fuel combustion unit 1 for combustion support, that is, the heat energy is recovered again, and the air temperature is also increased to make its combustion support effect better. The flue gas discharged from the multi-phase fuel combustion unit 1 enters a flue gas and heat recovery unit 2, and the water transported by the water supply unit 3 is preheated by the flue gas of the flue gas and heat recovery unit 2, that is, the flue gas temperature is reduced and heat recovery is also achieved. The whole system forms a closed loop of "combustion - steam drive - waste heat recovery - resource circulation", which not only reduces energy consumption, but also improves the overall operation efficiency, realizes multi-fuel compatibility, cascade utilization of heat energy and water-gas cycle regeneration, significantly improves the comprehensive thermal efficiency, and combines high efficiency and environmental protection.

Claims

1. A two-stroke engine system driven by multi-phase fuel heating steam, characterized in that, Comprising: A multiphase fuel combustion unit (1) for burning fuel to generate heat; A water supply unit (3) that extends through a pipeline into the multiphase fuel combustion unit (1) to supply water, and the multiphase fuel combustion unit (1) evaporates the water; A flue gas heat recovery unit (2) for recovering the flue gas generated by combustion in the multiphase fuel combustion unit (1) and preheating the water in the water supply pipeline of the water supply unit (3); A steam engine (5) that receives the steam evaporated from water by the multiphase fuel combustion unit (1) to perform cylinder work; A preheating and recovering air combustion-supporting unit (4) that receives the steam discharged from the steam engine unit (5), condenses and recovers the steam through air convection, and the heated air enters the multiphase fuel combustion unit (1) for combustion support.

2. The multi-phase fuel heating steam-driven two-stroke engine system according to claim 1, wherein The multiphase fuel combustion unit (1) includes a solid fuel feeding bucket (11). Inside the solid fuel feeding bucket (11), there are a gas fuel supply pipe (13), a liquid fuel supply pipe (14), and an ash-dropping net (15). The liquid fuel supply pipe (14) is spirally wound around the inner wall of the solid fuel feeding bucket (11). At the upper end of the solid fuel feeding bucket (11), there are a smoke exhaust port (19) and an openable feeding port (12). Inside the multiphase fuel combustion unit (1), there is a steam chamber (16), and the steam chamber (16) is provided with a steam pipe (17) communicating with the input end of the steam engine (5); The preheating and recovering air combustion-supporting unit (4) adds air for combustion support into the solid fuel feeding bucket (11); the flue gas heat recovery unit (2) is communicated with the smoke exhaust port (19); the pipeline of the water supply unit (3) extends into the solid fuel feeding bucket (11) and is communicated with the steam chamber (16).

3. The multi-phase fuel heating steam-driven two-stroke engine system according to claim 2, wherein, A dust-proof net (18) is installed inside the smoke exhaust port (19) to prevent the dust in the solid fuel feeding bucket (11) from entering the flue gas heat recovery unit (2).

4. The multi-phase fuel heating steam-driven two-stroke engine system according to claim 2, wherein A spiral extrusion granulator (120) is installed at the lower end of the solid fuel feeding bucket (11) for extruding and granulating the burned dust for recovery.

5. The two-stroke engine system driven by multi-phase fuel heated steam according to claim 2, characterized in that, The water supply unit (3) includes a water supply tank (31) and a water pump (33). The water supply tank (31) is provided with a water filling port (32). The water pump (33) pumps the water in the water supply tank (31). The output end of the water pump (33) is installed with a heating water pipe (34). The heating water pipe (34) passes through the flue gas heat recovery unit (2) and enters the solid fuel feeding bucket (11) along the smoke exhaust port (19), spirally wound around the inner wall of the solid fuel feeding bucket (11), and finally communicated with the steam chamber (16).

6. The multi-phase fuel heated steam-driven two-stroke engine system according to claim 5, wherein The flue gas heat recovery unit (2) includes a flue (21) communicated with the smoke exhaust port (19). A flue gas filter (22) is installed at the smoke outlet end of the flue (21). One end of the heating water pipe (34) passes through to the flue (21).

7. The two-stroke engine system driven by polyphase fuel heating steam according to claim 6, characterized in that, There are multiple partition plates (23) inside the flue (21). The partition plates (23) divide the internal space of the flue (21) into a serpentine channel, and the heating water pipe (34) is arranged along the serpentine channel inside the flue (21).

8. The multi-phase fuel heating steam-driven two-stroke engine system according to claim 7, characterized in that, Through the division of the partition plates (23), the inlet diameter of the flue (21) is larger than the outlet diameter.

9. The two-stroke engine system driven by polyphase fuel heating steam according to claim 5, characterized in that The steam engine (5) includes an engine body (51). An air inlet (52) and an air outlet (53) that communicate with a cylinder (515) are provided on the engine body (51). A crankshaft (54) and two camshafts (59) rotate inside the engine body (51). The cams of the camshafts (59) are in a diamond structure. A crank (55) is rotatably connected to the crankshaft (54). The upper end of the crank (55) is rotatably connected to a piston (56) that slides on the inner wall of the cylinder (515). A number of slide rods (512) are slidably connected to the engine body (51). A valve (514) is fixedly connected to the lower end of the slide rod (512). A number of valves (514) open and close the air inlet (52) and the air outlet (53) respectively. The other end of the slide rod (512) is fixedly connected to a pressing block (513) that cooperates with the camshaft (59). A retaining piece (511) located outside the engine body (51) is fixedly connected to the outer wall of the slide rod (512). A spring (515) that abuts against the retaining piece (511) and the engine body (51) is sleeved on the outer wall of the slide rod (512). The camshaft (59) presses the pressing block (513) movably. A driven sprocket (510) is installed at one end of the camshaft (59). A driving sprocket (57) is installed at one end of the crankshaft (54). A timing chain (58) is meshed and connected between the driving sprocket (57) and the driven sprocket (510). The transmission ratio of the driving sprocket (57) and the driven sprocket (510) driven by the timing chain (58) is 2:1; The air outlet (53) communicates with the preheating and recycling air combustion assisting unit (4); the steam pipe (17) communicates with the air inlet (52) and conveys steam into it.

10. The two-stroke engine system driven by polyphase fuel heating steam according to claim 9, wherein, The preheating and recycling air combustion assisting unit (4) includes a heat exchange channel (41) in a serpentine structure. A blower (44) that conveys air into its interior is installed at one end of the heat exchange channel (41). A water return pipe (45) is installed inside the heat exchange channel (41). One end of the water return pipe (45) communicates with the water supply tank (31). The water return pipe (45) is laid along the inside of the heat exchange channel (41), and the number of pipelines at the end of the water return pipe (45) away from the blower (44) gradually increases. An exhaust pipe (42) and a heat return pipe (43) that communicates with the end of the water return pipe (45) with more pipelines are installed at the other end of the heat exchange channel (41). The other end of the heat return pipe (43) communicates with the air outlet (53) and receives the waste gas discharged from the air outlet (53). The water return pipe (45) recovers the condensed water in the waste gas. The other end of the exhaust pipe (42) communicates with the inside of the solid fuel feeding bucket (11) and is used to supply combustion air.

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