Spiral plate type internal combustion efficient hot blast stove and using method

Abstract

The invention discloses a spiral plate type internal combustion efficient hot-blast stove and a using method, and relates to the technical field of hot-blast stoves, the stove comprises a stove body, a combustion chamber and a spiral plate type heat exchanger are arranged in the stove body, and the heat exchanger is of a plate type structure which is spirally distributed layer by layer around the central axis of the stove body; the plate type structure is divided into a hot air cavity part and a fresh air cavity part, fresh cold air passing through a fresh air cavity exchanges heat with combustion tail gas passing through the hot air cavity, a combustion chamber and a heat exchanger are seamlessly designed into a whole in the hot blast stove, a parallel plate type heat exchange mode of a spiral structure is adopted, cold air and hot air flow reversely in the whole heat exchange process, and heat exchange efficiency is improved. Cold air is heated gradually in a balanced mode, hot air is released gradually in a balanced mode, cold and hot air flows without turbulent flow in the whole heat exchange process, heat is utilized comprehensively, the heat efficiency is high, energy consumption is low, operation is stable, the automation degree is high, combustion tail gas is discharged into the atmosphere in a dispersed mode through the spiral plate type heat exchanger from the combustion chamber, the temperature is low, and the hot blast stove is safe, environmentally friendly and high in practicability.

Description

[0001] This application is a divisional application of a spiral plate type internal combustion high-efficiency hot air furnace. The application date of the original application is July 24, 2020, the application number is CN202010722900.2, and the name of the invention is a spiral plate type internal combustion high-efficiency hot air furnace. Technical Field

[0002] The invention relates to the technical field of hot blast stoves, and in particular to a spiral plate type internal combustion high-efficiency hot blast stove and a use method thereof. Background Art

[0003] Hot blast stoves are widely used in people's production and life. Their working method is to release heat from fuel combustion and heat the air through high-temperature flue gas so that the air temperature reaches the use standard. They are used in domestic heating, industrial production, thermal curing, grain drying and other fields. With the development and progress of society, people pay more and more attention to the environment. The fuel of traditional hot blast stoves has been gradually replaced by biomass fuel. The so-called biomass hot blast stove uses biomass as fuel, which produces less harmful gases than traditional fuels, and the utilization of biomass fuel itself also solves the environmental protection problem.

[0004] The types of hot blast stoves are mainly divided into internal combustion, external combustion and top combustion. The overall structure of the hot blast stove can be divided into two parts. One part is the combustion chamber, which is the part that produces heat by fuel combustion, and the other part is the heat exchanger, which is a structural device that exchanges the heat carried by the high-temperature gas generated in the combustion chamber with the fresh air from the outside. The fresh air with a lower temperature from the outside exchanges heat with the high-temperature flue gas generated in the combustion chamber in the heat exchanger, and then is heated and heated to form hot air.

[0005] At present, the biomass hot air furnace is also the main problem of most hot air furnaces. There are two aspects. The structure adopted is that the furnace is connected to the smoke pipe as the heating source, and a heated air interlayer is set around the furnace and the smoke exhaust pipe. The high-temperature gas generated by the combustion chamber flows in the smoke pipe in the form of an airflow beam, and the heat is dissipated through the outer surface of the smoke pipe. The center jet and surface flow velocity of the cylindrical airflow beam in the smoke pipe are inconsistent, and the center heat and the outer surface heat cannot be evenly dissipated. The center jet is higher than the surface flow velocity and brings out part of the heat, causing the heat to be not fully absorbed and discharged out of the furnace with the tail gas. The fresh air flows through the surface of the smoke pipe to absorb heat, and its heat dissipation area is small. The heat exchange smoke pipe of the heat exchange structure is perpendicular to the fresh air wind direction. Turbulence is easy to occur on the leeward side of the smoke pipe and the airflow obstruction part, resulting in large fresh air wind resistance, uneven heat exchange, incomplete heat exchange, and severe friction wind resistance loss. The exhaust smoke temperature is also relatively high, resulting in low efficiency of heat exchange and thermal energy utilization, and greater environmental pollution. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problems of the above hot blast stoves, such as small number of flue gas returns, small heat exchange area, short heat exchange time, uneven heat exchange, high exhaust temperature, low heat exchange efficiency between flue gas and fresh air, large fresh air wind resistance and friction loss. The present invention provides a new hot blast stove which seamlessly integrates the combustion chamber and heat exchanger of the hot blast stove into one, uses biomass fuel as energy, adopts a parallel plate heat exchange method with a spiral structure, and runs cold and hot air in countercurrent.

[0007] The present invention adopts the following technical solution:

[0008] The present invention provides a spiral plate type internal combustion high-efficiency hot blast furnace, comprising a furnace body, wherein a combustion chamber and a spiral plate heat exchanger are arranged in the furnace body, wherein the combustion chamber is arranged at the bottom center of the furnace body, and the spiral plate heat exchanger is arranged at the upper periphery of the combustion chamber, and the combustion chamber and the spiral plate heat exchanger are connected as a whole;

[0009] The spiral plate heat exchanger presents a plate structure with spiral layers around the central axis of the furnace body, and the spiral plate heat exchanger includes a plurality of hot air cavities and fresh air cavities arranged alternately with each other, and the spiral plate heat exchanger also includes a fresh hot air outlet, a combustion exhaust air outlet and a fresh cold air inlet, and the fresh hot air outlet, the combustion exhaust air outlet and the fresh cold air inlet are all arranged on the side wall of the furnace body;

[0010] The fresh cold air inlet, the fresh air cavity and the fresh hot air outlet are connected in sequence to form a fresh air channel;

[0011] The combustion chamber, the hot air cavity and the combustion exhaust gas outlet are connected in sequence to form a hot air channel.

[0012] Preferably, an ash collecting bin is provided at the bottom of the hot air cavity, the ash collecting bin is in layered communication with an ash cleaning port, and the ash cleaning port is provided on the side wall of the furnace body.

[0013] Preferably, a conical backfire port is provided on the top of the spiral plate heat exchanger; a removable insulation inner tank inspection cover is provided on the top of the furnace body just above the top conical backfire port, and an insulation material is provided at the bottom of the removable insulation inner tank inspection cover.

[0014] Preferably, a combustion-supporting mechanism is provided at the bottom of the combustion chamber, and the combustion-supporting mechanism includes a combustion-supporting air inlet for the combustion chamber, a combustion-supporting blower for the combustion chamber, a combustion-supporting air box and an air volume regulating valve;

[0015] A fuel grate is arranged between the combustion chamber and the combustion-supporting wind box, and the wind speed of the combustion-supporting blower in the combustion chamber is adjustable.

[0016] Preferably, an ash removal mechanism is provided at the bottom of the combustion chamber, and the ash removal mechanism includes a combustion chamber ash removal port and a combustion chamber ash removal channel, and the combustion chamber ash removal port is connected to the combustion chamber through the combustion chamber ash removal channel.

[0017] Preferably, a fuel funnel is provided on the side of the furnace body, a fuel feeding mechanism is provided below the fuel funnel, and the fuel feeding mechanism is connected to the combustion chamber through a throwing inclined pipe.

[0018] Preferably, an ignition port and a fire viewing furnace door are also provided on the side wall of the furnace body.

[0019] The present invention also provides a method for using a spiral plate type internal combustion high-efficiency hot blast furnace, comprising the following working process: biomass fuel is added into the bottom combustion chamber of the furnace body through a fuel feeding mechanism from a fuel hopper, combustion-supporting air is introduced into the combustion chamber through a combustion-supporting air inlet by a combustion chamber combustion-supporting blower, and ignition is performed through an ignition port arranged on a side wall of the furnace body, thereby the combustion chamber starts to burn and produces combustion tail gas, and when the combustion tail gas reaches a certain temperature, a new cold air inlet blower sends new cold air into the furnace body through the new cold air inlet, and the new cold air moves and diffuses toward the center of the furnace body in circles along the new air cavity of the spiral plate structure of the spiral plate heat exchanger, and at the same time, the combustion tail gas emitted upward from the combustion chamber is turned back at the return fire port and dispersed downward into the hot air cavity of the spiral plate structure of the spiral plate heat exchanger, and the combustion tail gas diffuses from the center of the furnace body to the outside of the furnace body in circles;

[0020] The new cold air exchanges heat with the combustion exhaust gas in the hot air cavity during the diffusion process along the new air cavity toward the center of the furnace body. The new cold air is heated up to form hot air after heat exchange and is finally discharged from the new hot air outlet. At the same time, the high-temperature combustion exhaust gas in the hot air cavity is cooled after heat exchange with the new cold air and is finally discharged to the external environment through the exhaust fan at the combustion exhaust outlet, thus completing the heat exchange process.

[0021] The particulate matter carried by the combustion exhaust gas is deposited in the ash collecting bin due to gravity for a period of time. It can be removed through the ash cleaning port, and the remaining ash in the combustion chamber can be discharged through the ash removal port.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are:

[0023] The present invention provides an internal combustion high-efficiency hot blast furnace with a spiral plate heat exchange method. Compared with the prior art, firstly, the combustion chamber is arranged below the core of the heat exchanger. The design of the spiral plate structure solves the problem that the energy is not fully utilized and is discharged out of the furnace due to the simple structure inside the furnace, short flame stroke, small heat dissipation area, uneven heat dissipation, and the jet flow causes the energy to be discharged out of the furnace without being fully utilized, resulting in low efficiency of heat exchange and thermal energy utilization. Secondly, it solves the problem that the temperature of the exhausted combustion smoke is high and there are many particulates in the tail wind, which pollutes the environment. It also further solves the problem that the heat exchange smoke pipe of the heat exchange structure is perpendicular to the wind direction of the fresh air, resulting in turbulence, large fresh air resistance, uneven suction and heat dissipation, and severe friction loss.

[0024] In the technical solution provided by the present invention, the combustion chamber and the heat exchanger of the hot blast furnace are seamlessly connected and integrated into one. The heat exchanger structure is ingeniously designed. The cold and hot air run in countercurrent during the entire heat exchange process, and the heat is fully utilized. During the entire heat exchange process, the cold air is balanced and gradually heated, and the hot air is balanced and gradually releases heat. The combustion exhaust gas is pressed into a flat state by the gap air duct without jets and turbulence. When the new cold air and the combustion hot air pass through the spiral plate heat exchanger, the directions of the airflows are relatively countercurrent and parallel to each other, and a cold and hot air flow without turbulence, high thermal efficiency, low energy consumption, and stable operation is achieved. The combustion exhaust gas is discharged into the atmosphere after passing through the spiral plate heat exchanger from the combustion chamber to release heat. The temperature is also very low, which is safe and environmentally friendly.

[0025] In the technical solution provided by the present invention, automatic sampling and comparison controls the fuel supply amount and the combustion-supporting cold air supply amount of the combustion chamber through the output level of the controller to achieve automatic constant temperature operation.

[0026] The present invention provides a new type of hot blast stove which seamlessly integrates the combustion chamber and heat exchanger of the hot blast stove into one, uses biomass fuel as energy, adopts a parallel plate heat exchange method with a spiral structure, and has countercurrent operation of cold and hot air. The hot blast stove equipment has a novel and ingenious structural design and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 A top view of a spiral plate type internal combustion high-efficiency hot air stove in Embodiment 1 of the present invention;

[0029] Figure 2 This is a front view of a spiral plate type internal combustion high-efficiency hot air stove in Embodiment 1 of the present invention;

[0030] Figure 3 It is a left side view of the spiral plate type internal combustion high efficiency hot blast stove in the first embodiment of the present invention;

[0031] Figure 4 It is a rear view of the spiral plate type internal combustion high-efficiency hot air stove in the first embodiment of the present invention;

[0032] Figure 5 for Figure 1 Middle AA section;

[0033] Figure 6 for Figure 1 Middle BB section;

[0034] Figure 7 for Figure 5 The CC cross-section diagram in the middle is also a top-down structural diagram of the spiral plate heat exchanger.

[0035] Figure numerals: 1-furnace body, 2-fire viewing furnace door, 3-ash removal port of combustion chamber, 4-ignition port, 5-ash cleaning port, 6-new hot air outlet, 7-combustion exhaust outlet, 8-exhaust exhaust fan, 9-new cold air inlet, 10-new cold air inlet fan, 11-combustion chamber combustion air inlet, 12-combustion chamber combustion blower, 13-detachable insulation liner inspection cover, 14-lifting ear, 15-fuel funnel, 16-fuel unloading mechanism, 17-driven sprocket, 18-driving sprocket, 19-transmission chain strip, 20-throwing inclined pipe, 21-combustion-supporting wind box, 22-fire viewing channel, 23-combustion chamber ash removal channel, 24-fuel grate, 25-electronic ignition rod, 26-ignition rod sleeve, 27-combustion chamber, 28-ash collecting bin, 29-hot air cavity, 30-fresh air cavity, 31-insulating material, 32-spiral plate heat exchanger, 33-combustion exhaust gas flow path, 34-combustion exhaust gas flow direction, 35-fresh air flow path, 36-fresh air flow direction, 37-conical return fire port, 38-air volume regulating valve. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] Example 1

[0038] like Figures 1 to 7As shown, this embodiment discloses an internal combustion high-efficiency hot air furnace with spiral plate heat exchange, the furnace comprises a furnace body 1, a combustion chamber 27 and a spiral plate heat exchanger 32 are arranged in the furnace body, the combustion chamber 27 and the spiral plate heat exchanger 32 are seamlessly connected and integrated into one, the combustion chamber 27 is arranged at the bottom center of the furnace body 1, a combustion supporting mechanism is arranged at the bottom of the combustion chamber 27, the combustion supporting mechanism comprises a combustion chamber combustion supporting air inlet 11, a combustion chamber combustion supporting blower 12, a combustion supporting air box 21 and an air volume regulating valve 38, through which the combustion chamber combustion supporting air is passed through the combustion chamber combustion supporting air inlet 11, a combustion chamber combustion supporting air blower 12, a combustion supporting air box 21 and an air volume regulating valve 38, The combustion air inlet 11 introduces combustion air into the combustion chamber 27 to assist the combustion of the fuel in the combustion chamber 27. The combustion cold air blower 1 can be adjusted in speed. A new hot air outlet 6 is provided at the side wall of the furnace body 1 opposite to the combustion cold air inlet 11. An ignition port 4 directly connected to the combustion chamber is also provided on the side wall of the furnace body 1. An electronic ignition rod 25 is used to perform ignition operation into the combustion chamber 27 through the ignition port. A fire-watching furnace door 2 is also provided on the side wall of the furnace body. The fire in the combustion chamber 27 is observed in real time through the fire-watching furnace door 2 and the fire-watching channel 22. An ash removal mechanism is also provided at the bottom of the combustion chamber 27 and on the side of the combustion-supporting wind box 21. The ash removal mechanism includes a combustion chamber ash removal port 3 and a combustion chamber ash removal channel 23. The residue in the combustion chamber 27 is discharged from the furnace body through the ash removal mechanism. A fuel grate 24 is also provided between the combustion chamber 27 and the combustion-supporting wind box 21.

[0039] A fuel hopper 15 for holding biomass fuel is also provided on the side of the furnace body 1, and a fuel unloading mechanism 16 for controlling the amount of fuel added is provided below the fuel hopper 15. The unloading mechanism 16 includes a driving sprocket 18, a driven sprocket 17, a transmission chain 19 and a throwing inclined tube 20. The biomass fuel in the fuel funnel 15 is added to the combustion chamber 27 for combustion through the fuel unloading mechanism. The unloading amount of the fuel unloading mechanism 15 can be controlled by adjusting the speed of the motor.

[0040] The spiral plate heat exchanger 32 is arranged on the upper periphery of the combustion chamber 27, and a conical return fire port 37 is provided on the top of the spiral plate heat exchanger 32. Insulating material 31 is provided at the top of the heat exchanger 32 and below the top cover 13 for disassembling the insulation inner tank for maintenance. The spiral plate heat exchanger 32 is respectively provided with a new cold air inlet 9 and a combustion exhaust gas outlet 7. The new cold air inlet 9 and the combustion exhaust gas outlet 7 are respectively arranged on the side walls of the furnace body 1, and the combustion exhaust gas outlet 7 is arranged above the new cold air inlet 9.

[0041] The structure of the spiral plate heat exchanger 32 is a plate structure that is distributed in spiral layers around the central axis of the furnace body 1. The plate structure is divided into a hot air cavity 29 and a fresh air cavity 30. The hot air cavity 29 and the fresh air cavity 30 are arranged parallel to the central axis of the combustion chamber 27. An ash collecting bin 28 is provided at the bottom of the hot air cavity 29. The ash collecting bin 28 of the heat exchanger is connected to the ash removal port 5 of the heat exchanger in layers. The fresh air cavity 30, the fresh hot air outlet 6 and the fresh cold air inlet 9 are interconnected, and the combustion exhaust gas generated by the combustion chamber 27 enters the hot air cavity 29 from the spiral plate heat exchanger 32, diffuses outward layer by layer along the combustion exhaust gas flow direction 34 and the combustion exhaust gas flow path 33, and is finally discharged from the combustion exhaust gas outlet 7. Fresh air is introduced from the outside of the heat exchanger 32, and the fresh cold air enters the fresh air cavity 30 of the spiral plate heat exchanger 32 through the fresh cold air inlet 9, diffuses inward layer by layer along the fresh air flow direction 36 and the fresh air flow path 35, and is finally discharged from the fresh hot air outlet 6 downward around the outer wall of the combustion chamber 27. The hot air cavity 29 and the fresh air cavity 30 of the spiral plate heat exchanger 32 are designed to be narrow, so as to press the combustion exhaust gas and the fresh cold air into a flat state, which is more conducive to heat dissipation and absorption. This process is the heat exchange between the fresh cold air and the combustion exhaust gas. The spiral plate structure design of the spiral plate heat exchanger 32 provides sufficient return heat exchange area and heat exchange time for the heat energy transfer between the new cold air and the combustion exhaust gas, and the hot air cavity 29 and the fresh air cavity 30 of the spiral plate heat exchanger 32 compress the wind into a flat rectangle. The entire structure is cleverly designed, and the combustion chamber and the heat exchanger of the hot blast furnace are seamlessly connected and integrated into one. In the entire heat exchange process, the cold and hot air run in countercurrent, and the heat is used in all directions. The cold air is balanced and gradually heated, and the hot air is balanced and gradually releases heat. The cold and hot air flow without turbulence, with high thermal efficiency, low exhaust gas temperature, low energy consumption, stable operation, and high degree of automation. The combustion exhaust gas is discharged from the combustion chamber through the hot air cavity 29 on the spiral plate heat exchanger 32 and into the atmosphere through the tail wind exhaust fan. The particulate matter carried by the combustion exhaust gas is deposited in the gap ash bin due to gravity. After a period of use, it can be removed through the ash cleaning port 5. The discharged exhaust gas is clean, low in temperature, safe and environmentally friendly.

[0042] The hot air output from the hot blast furnace is temperature-controlled, and a control signal can be output through a controller via a temperature sampling signal to control the fuel supply amount and the combustion-supporting cold air supply amount of the combustion chamber to achieve automatic control.

[0043] Example 2

[0044] Based on the technology in the above embodiments, the specific use process and principle of a spiral plate type internal combustion high-efficiency hot air furnace provided by the present invention are as follows: biomass fuel is added to the bottom combustion chamber 27 of the furnace body 1 through the fuel feeding mechanism 16 from the fuel hopper 15, and the combustion chamber combustion-supporting blower 12 delivers combustion-supporting air into the combustion chamber 27 through the combustion chamber combustion-supporting air inlet 11, and ignites through the ignition port 4 set on the side wall of the furnace body 1, thereby starting to burn in the combustion chamber to generate a heat source, that is, combustion exhaust gas, and when the combustion exhaust gas reaches a certain temperature, the new cold air inlet blower 1 0 New cold air is sent into the furnace body 1 through the new cold air inlet 9. The new cold air moves and diffuses toward the center of the furnace body 1 in circles along the spiral plate structure cavity 30 of the spiral plate heat exchanger 32, along the fresh air flow direction 36 and the fresh air flow path 35. At the same time, the combustion exhaust gas emitted upward from the combustion chamber 27, that is, the heat source, is turned back at the return fire port 37 and dispersed downward into the spiral plate hot air cavity 29. The combustion exhaust gas dispersed into the spiral plate structure hot air cavity 29 of the spiral plate heat exchanger 32 moves along the combustion exhaust gas flow direction 34 and the combustion exhaust gas flow path 35. The diameter 33 of the furnace body 1 is diffused from the center of the furnace body 1 to the outside of the furnace body 1 in circles. In the process that the combustion exhaust gas diffuses from the center of the furnace body 1 to the outside of the furnace body 1 in circles along the hot air cavity 29 of the spiral plate structure and the new cold air moves in circles toward the center of the furnace body 1 along the new air cavity 30 of the spiral plate structure, that is, the process of heat exchange between the new cold air and the combustion exhaust gas, the new cold air reaches the center of the furnace body 1 through the heat exchanger, and after heat exchange with the high-temperature combustion exhaust gas generated in the combustion chamber 27, it is heated and heated to form hot air, which is discharged from the hot air outlet through the hot air outlet. 6 is discharged, and the high-temperature combustion exhaust gas passes through the spiral plate heat exchanger 32 for heat exchange with the new cold air, and the temperature is reduced, and is discharged into the external environment through the combustion exhaust gas outlet 7 and the exhaust gas exhaust fan 8, thereby completing the heat exchange process. The particulate matter carried by the combustion exhaust gas is deposited in the gap ash collection bin due to gravity. After a period of use, it can be removed through the ash cleaning port 5, and the remaining ash in the combustion chamber can be removed through the ash removal port 3. By controlling the fuel supply amount and the combustion-supporting cold air supply amount, the entire combustion and heat exchange process can be set to an intelligent constant temperature and operate automatically.

[0045] According to the demand, the temperature of the fresh hot air outlet 6 is set to a constant temperature. The temperature signal of the fresh hot air outlet 6 is sampled and amplified and then passed through the controller. Then the controller controls the speed and air intake volume of the combustion-supporting cold air blower 12 and the speed and discharge volume of the fuel discharge mechanism 16 to achieve automatic constant temperature operation.

[0046] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A spiral plate type internal combustion high efficiency hot air stove, characterized in that: The invention comprises a furnace body (1), wherein a combustion chamber (27) and a spiral plate heat exchanger (32) are arranged in the furnace body (1), wherein the combustion chamber (27) is arranged at the bottom center of the furnace body (1), and the spiral plate heat exchanger (32) is arranged at the upper periphery of the combustion chamber (27), and the combustion chamber (27) and the spiral plate heat exchanger (32) are connected as a whole; The spiral plate heat exchanger (32) presents a plate structure with spiral layer distribution around the central axis of the furnace body (1), and the spiral plate heat exchanger (32) includes a plurality of hot air cavities (29) and fresh air cavities (30) arranged alternately with each other. The spiral plate heat exchanger (32) also includes a fresh hot air outlet (6), a combustion exhaust air outlet (7) and a fresh cold air inlet (9), and the fresh hot air outlet (6), the combustion exhaust air outlet (7) and the fresh cold air inlet (9) are all arranged on the side wall of the furnace body (1); The fresh cold air inlet (9), the fresh air cavity (30) and the fresh hot air outlet (6) are connected in sequence to form a fresh air channel; The combustion chamber (27), the hot air cavity (29) and the combustion exhaust gas outlet (7) are sequentially connected to form a hot air channel.

2. A spiral plate type internal combustion high efficiency hot air stove according to claim 1, characterized in that: An ash collecting bin (28) is provided at the bottom of the hot air cavity (29), and the ash collecting bin (28) is in layered communication with an ash cleaning port (5), and the ash cleaning port (5) is provided on the side wall of the furnace body (1).

3. The spiral plate type internal combustion high efficiency hot air stove according to claim 1, characterized in that: The spiral plate heat exchanger (32) is provided with a conical return fire port (37) at the top; a removable heat-insulating inner tank inspection cover (13) is provided at the top of the furnace body (1) directly above the top conical return fire port (37); and a heat-insulating material (31) is provided at the bottom of the removable heat-insulating inner tank inspection cover (13).

4. The spiral plate type internal combustion high efficiency hot air stove according to claim 1, characterized in that: A combustion-supporting mechanism is disposed at the bottom of the combustion chamber (27), and the combustion-supporting mechanism comprises a combustion-supporting air inlet (11), a combustion-supporting blower (12), a combustion-supporting air box (21), and an air volume regulating valve (38); A fuel grate (24) is provided between the combustion chamber (27) and the combustion-supporting wind box (21), and the wind speed of the combustion chamber combustion-supporting blower (12) is adjustable.

5. The spiral plate type internal combustion high efficiency hot air stove according to claim 1, characterized in that: An ash removal mechanism is provided at the bottom of the combustion chamber (27), the ash removal mechanism comprising a combustion chamber ash removal port (3) and a combustion chamber ash removal passage (23), the combustion chamber ash removal port (3) being connected to the combustion chamber (27) via the combustion chamber ash removal passage (23).

6. The spiral plate type internal combustion high efficiency hot air stove according to claim 1, characterized in that: A fuel hopper (15) is provided on the side of the furnace body (1), a fuel discharge mechanism (16) is provided below the fuel hopper (15), and the fuel discharge mechanism (16) is connected to the combustion chamber (27) through a material throwing inclined pipe (20).

7. The spiral plate type internal combustion high efficiency hot air stove according to claim 1, characterized in that: An ignition port (4) and a fire viewing furnace door (2) are also provided on the side wall of the furnace body (1).

8. A method for using a spiral plate type internal combustion high-efficiency hot air stove, characterized in that: The invention comprises the following working process: a fuel hopper (15) adds biomass fuel into a combustion chamber (27) at the bottom of a furnace body (1) through a fuel feeding mechanism (16); a combustion chamber combustion-supporting blower (12) introduces combustion-supporting air into the combustion chamber (27) through a combustion-supporting air inlet (11); ignition is performed through an ignition port (4) arranged on a side wall of the furnace body (1); thus, combustion in the combustion chamber (27) starts to generate combustion exhaust gas; when the combustion exhaust gas reaches a certain temperature, a new cold air inlet blower (10) passes new cold air into the combustion chamber (27); The cold air inlet (9) delivers new cold air into the furnace body (1), and the new cold air moves and diffuses in circles along the new air cavity (30) of the spiral plate structure of the spiral plate heat exchanger (32) toward the center of the furnace body (1). At the same time, the combustion exhaust gas emitted upward from the combustion chamber (27) is turned back at the return fire port (37) and dispersed downward into the hot air cavity (29) of the spiral plate structure of the spiral plate heat exchanger (32), and the combustion exhaust gas diffuses in circles from the center of the furnace body (1) to the outside of the furnace body (1); The new cold air exchanges heat with the combustion exhaust gas in the hot air cavity (29) as it diffuses in circles along the new air cavity (30) toward the center of the furnace body (1). The new cold air is heated up through the heat exchange to form hot air, which is finally discharged from the new hot air outlet (6). At the same time, the high-temperature combustion exhaust gas in the hot air cavity (29) is cooled down after the heat exchange with the new cold air, and is finally discharged into the external environment through the exhaust gas exhaust fan (8) of the combustion exhaust gas outlet (7), thereby completing the heat exchange process. The particulate matter carried by the combustion exhaust gas is deposited in the ash collecting bin (28) due to gravity for a period of time and can be removed through the ash removal port (5). The remaining ash in the combustion chamber (27) can be discharged through the ash removal port (3).

Images