CN113623864A

CN113623864A - Mixed combustion type hot blast stove for drying agricultural products

Info

Publication number: CN113623864A
Application number: CN202110775783.0A
Authority: CN
Inventors: 杨映礼
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-11-09

Abstract

The invention discloses a co-combustion type hot blast stove for drying agricultural products, which structurally comprises a stove body, a multi-air-intake combustion-supporting device, a heat dissipation system, a waste heat recovery combustion-supporting temperature control device, a fuel or fuel gas co-combustion heating device and a chimney; the co-combustion type hot blast stove for drying agricultural products takes raw material type renewable substances as matrix fuel, methane, natural gas, coal gas or atomized diesel oil, kerosene, alcohol-based fuel and biomass fuel are connected from a fuel oil or fuel gas co-combustion heat supply device for co-combustion, the defects of short heat supply period and high furnace intensity of the single-use raw material type biomass fuel are overcome, or the fuel gas and the fuel oil are separately used for combustion and heat supply, and the requirement that different fuel source areas obtain the optimal heat supply scheme for drying the agricultural products is met; the combined application of the multiple air inlet combustion-supporting device, the heat dissipation system and the waste heat recovery combustion-supporting temperature control device achieves the optimal combustion efficiency and thermal efficiency of the hot blast stove and obvious emission reduction.

Description

Mixed combustion type hot blast stove for drying agricultural products

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to agricultural product drying equipment, and belongs to a hot blast stove which applies tertiary combustion technology and uses biomass briquette fuel, raw material type renewable substances as a matrix and a plurality of gas and fuel oil fuels for mixed combustion and heat supply.

Background

The invention relates to a co-combustion type hot blast stove for drying agricultural products, which is an important device applied to the field of agricultural product drying. At present, biomass or coal-fired hot air furnaces widely used for drying agricultural products have the defects of low combustion efficiency (about 75%), low energy efficiency, high furnace intensity and the like. Smoke discharged by the coal-fired hot blast stove pollutes the environment, the burning point of the coal is high, and the temperature is not easy to control; the biomass fuel of the biomass hot blast stove has low burning point, the automatic control of the temperature of the hot blast stove is easy to realize, and the molded biomass fuel has high cost due to low heat value of the biomass fuel; the raw material type biomass fuel has wide sources and low cost, but has high furnace intensity. With the development trend of mechanization, intellectualization and standardization in the field of agricultural product drying, new opportunities and challenges are provided for the energy conservation, environmental protection, intelligent degree and comprehensive utilization of clean energy of the hot blast stove.

The invention is the latest achievement of optimizing, improving and improving on the basis of ZL2014205865484 utility model patent of walnut drying hot blast stove capable of automatically controlling temperature and 2017113000018 invention patent of biomass gasification direct-fired heat supply technology of agricultural product drying hot blast stove, and aims to provide a renewable biomass energy source which not only can directly utilize various potential raw material types, meanwhile, biomass energy sources such as methane, alcohol-based fuel, diesel oil, biomass fuel oil, natural gas, coal gas and kerosene or fossil energy sources can be respectively used for co-combustion heat supply, the requirements of agricultural product drying equipment under different energy resource conditions are met, a universal hot blast stove capable of co-combustion of single fuel or multiple fuels is provided for the market, the mechanical, intelligent and standard level of the agricultural product drying equipment is improved, the energy-saving and consumption-reducing level is improved, the emission is reduced, and the air drying quality of agricultural products is improved.

Disclosure of Invention

The invention relates to a co-combustion type hot blast stove for drying agricultural products, which utilizes the thermodynamics principle and the biomass pyrolysis gasification principle, combines the combustion characteristics of various raw material type renewable substance fuels and the characteristics of various fuel gases and fuel oils in rural areas in mountainous areas, optimizes and perfects the structure and the performance of a hot blast stove radiator on the basis of the structure of a hot blast stove of the utility model patent ZL2014205865484, adds the perfect structures of primary oxygen supply, secondary oxygen supply and tertiary oxygen supply in the combustion process of the hot blast stove fuel, particularly adds a device capable of co-combusting various fuel gases and fuel oils for supplying heat, and greatly expands the fuel application range of the hot blast stove; the unique tertiary oxygen supply structure of the hot blast stove greatly improves the fuel combustion efficiency and the heat efficiency, greatly reduces the discharge and reduces the fuel cost.

The invention relates to a co-combustion type hot blast stove for drying agricultural products, which mainly comprises a stove body, a multi-air-intake combustion-supporting device, a gas or fuel co-combustion heating device, a heat dissipation system, a waste heat recovery combustion-supporting temperature control device and a smoke exhaust pipe.

The invention relates to a co-combustion type hot blast stove for drying agricultural products, which is characterized in that a stove body is an oval barrel, and the structure of the co-combustion type hot blast stove mainly comprises a hearth, a grate, a stove door, an ash falling groove, an ash accumulation groove, an ash discharge groove door, a stove body cooling fin, a stove neck and a stove body foot rest; the multi-air-intake combustion-supporting device comprises a secondary oxygen-supplying air inlet pipe, a secondary oxygen-supplying cavity partition plate, a secondary oxygen-supplying hole, a secondary combustion chamber, a fire head, a tertiary oxygen-supplying hole, a tertiary combustion chamber and a tertiary combustion chamber partition plate; the heat dissipation system mainly comprises a heat collection box, heat collection box fins, heat dissipation pipes, smoke outlet heat dissipation pipes, an ash accumulation box and ash accumulation box fins; the waste heat recovery combustion-supporting temperature control device mainly comprises a waste heat recovery tank, a flue gas cooling pipe, a flue decoking movable cover, a waste heat recovery oxygen supply guide pipe, a primary oxygen supply air inlet pipe and a waste heat recovery tank support; the gas or fuel oil mixed combustion heat supply device mainly comprises a fuel oil and gas burner, a gas inlet pipe, a fuel oil and gas booster pump, an oil and gas stop valve or an atomization device.

The invention relates to a co-combustion type hot blast stove for drying agricultural products, which is characterized in that the co-combustion type hot blast stove is combined with various types of ovens and automatic control systems to form an agricultural product drying machine. The hot blast stove is arranged in a hot blast exchange chamber of the oven or in a structure of the intermediate heat exchange chamber of the oven with two ends, and only a feed port furnace door, a smoke exhaust pipe and an ash discharge groove door are required to be exposed out of the hot blast exchange chamber; the primary oxygen supply pipe fan, the secondary oxygen supply blower, the fuel gas and fuel oil booster pump and the oil and gas stop valve or the atomization device are arranged outside the hot air exchange chamber, the power supply is connected with the output end of the controller in parallel, and the temperature and humidity sensor of the controller is placed at the corresponding position in the oven to form an automatic control structure of the hot air furnace.

The invention relates to a co-combustion type hot blast stove for drying agricultural products, which has the working principle and the process that: after the raw material type renewable substance fuel or biomass briquette fuel in the hearth is ignited for the first time, the air flow of a primary oxygen supply blower passes through the inner cavity of the waste heat recovery box to absorb the heat of the flue gas cooling pipe and the waste heat recovery box, the air flow enters the hearth from a primary oxygen supply port I and a primary oxygen supply port II to support combustion under the action of the air pressure of the blower, the biomass fuel is pyrolyzed under the environment with certain air pressure to form flame or high-temperature mixed flue gas, meanwhile, atomized fuel oil mixed gas or fuel gas enters the hearth from a fuel gas inlet pipe to be mixed with high-temperature mixed flue gas generated by combustion of the biomass fuel, the mixed flue gas after being subjected to oxygen supplementation and temperature rise in a secondary combustion chamber, the mixed flue gas after continuous combustion enters a tertiary combustion chamber from a fire head, the high-temperature mixed flue gas entering the tertiary combustion chamber is decompressed to obtain tertiary oxygen supply hole oxygen supplementation, and the high-temperature mixed flue gas is fully combusted in the tertiary combustion chamber again, the flue gas after abundant burning flows to the heat-collecting box through cubic combustion chamber exhanst gas outlet, and the circuitous heat dissipation cooling of rethread cooling tube is cooled down to the waste heat recovery incasement of flue gas cooling pipe after cooling down once more, discharges to the chimney from the pipe of discharging fume, accomplishes biomass gasification and fires the heat supply process thoughtlessly. Because the furnace door and the ash discharge groove door are in a sealed state when the hot blast furnace operates under working conditions, the primary oxygen supply fan and the secondary oxygen supply fan supply oxygen and supply the gas and oil to the gas and oil combustion device are in a synchronous state, the residual carbon of the biomass fuel plays a role in ignition and combustion supporting, the period of adding the biomass fuel is greatly prolonged, the intelligent temperature control effect is obviously improved, and the intensity of a furnace driver is effectively reduced.

The invention relates to a CO-combustion type hot blast stove for drying agricultural products, which is a high-efficiency energy-saving hot blast stove composed of a stove body, a multi-air-inlet combustion-supporting device, a heat dissipation system, a waste heat recovery combustion-supporting temperature control device and a fuel gas or fuel oil CO-combustion heating device, wherein the combustion efficiency is tested by using biomass briquette fuel, coal, firewood, corncobs and walnut shells simultaneously with 5 similar products widely used in Yunnan, the combustion net efficiency of the hot blast stove is up to 90 percent, is 20 percent higher than that of other 5 similar products, the smoke emission is reduced by 70 percent, the CO concentration discharged by a chimney can be controlled between 900 plus 2000PPM, the chimney discharges smoke visually, the Ringelman level is 0, and the energy-saving and emission-reducing effects are obvious.

Drawings

Fig. 1 is a side elevational view of the present invention.

Fig. 2 is a plan view of the present invention.

Fig. 3 is a front elevation view of the present invention.

Fig. 4 is a cross-sectional view of the present invention.

In fig. 1: 1-furnace door; 2-a feed inlet; 3-one primary oxygen supply port I; 4-a first oxygen supply shunt conduit; 5-hot blast stove feet; 6-furnace neck; 7-movable cover of heat collection box; 8-a flue gas outlet of the tertiary combustion chamber; 9-a heat collecting tank partition plate; 10-a heat collecting tank; 11-heat collecting tank fin; 12-tertiary combustion chamber partition; 13-parallel radiating pipes; 14-a furnace body; 15-secondary oxygen supply cavity partition board; 16-inclined radiating pipes; 17-tertiary combustion chamber; 18-thrice oxygen supply hole; 19-fire head; 20-secondary oxygen supply holes; 21-smoke discharging and radiating pipe; 22-secondary oxygen supply cavity; 23-a secondary oxygen supply port; 24-a secondary combustion chamber; 25-furnace rear sealing plate; 26-ash deposition box fins; 27-ash deposition box; 28-a waste heat recovery tank baffle; 29-waste heat recovery tank; 30-a smoke exhaust pipe; 31-a flue gas cooling pipe; 32-a waste heat recovery hot air outlet; 33-inlet of waste heat recovery tank; 34-a waste heat recovery inner cavity; 35-a coke-removing movable cover of the flue; 36-a hearth; 37-a waste heat recovery hot air duct; 38-ash chute; 39-gas fire head; 40-a grate; 41-primary oxygen supply port II; 42-a waste heat recovery tank support; 43-waste heat recovery air intake duct; 44-a gas inlet pipe; 45-secondary air intake duct; 46-ash deposition groove; 47-secondary oxygen supply fan interface; 48-primary oxygen supply fan interface.

In fig. 2: 49-heat collecting box movable cover fin; 50-flue decoking port. In fig. 2

reference numerals

1, 2, 3, 4, 9, 10, 11, 13, 16, 21, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 are the same structures in fig. 1.

In fig. 3: 51-furnace protection grate; 52-furnace body fins. In fig. 3,

reference numerals

1, 3, 5, 7, 8, 9, 10, 12, 13, 14, 15, 16, 22, 23, 30, 31, 36, 39, 40, 49 denote the same structures as in fig. 1 or fig. 2.

In fig. 4: 53-ash discharge port; 54-a second primary oxygen supply shunt conduit; 55-ash discharge slot door; 56-hot air diversion conduit interface. In fig. 4,

reference numerals

5, 12, 13, 15, 16, 22, 23, 27, 29, 30, 32, 33, 37, 39, 40, 41, 42, 46, 48, 51, 52 denote the same structures as in fig. 1 or fig. 2 or fig. 3.

Detailed Description

The structural characteristics of the mixed combustion type hot blast stove for drying agricultural products are further explained by combining the attached drawings and the embodiment.

In the attached figure, the furnace body 14 is an oval cylinder body which is rolled by a hot rolled plate, the cylinder body is horizontally arranged, the long axis is vertical to the horizontal plane, the lower end of the cylinder body is the bottom, the upper end is the top, and the bottom is provided with a hot blast furnace foot stand 5; one end of the cylinder is a feed inlet 2 and is provided with a pressure-resistant sealing furnace door 1, the other end of the cylinder is provided with a furnace chamber rear sealing plate 25, the outer side of the lower part of the rear sealing plate 25 is provided with an ash accumulation groove 46, the bottom end of the rear sealing plate is provided with an ash discharge port 53 which is connected with the ash accumulation groove 46, the outer opening of the ash accumulation groove 46 is provided with an ash discharge groove door 55, the ash discharge port 53 is communicated with an air inlet channel and an ash discharge groove 38 at the bottom of the grate 40 and is connected with the ash accumulation groove 46 to form the tail part of the furnace body, the grate 40 is arranged at the lower part in the cylinder, and the cylinder is divided into an upper-layer furnace chamber 36 and a lower-layer air inlet channel and an ash discharge groove 38 to form a fuel combustion carbon ash settling and discharging structure; vertical protective grates 51 are arranged on two sides of the grate 40, so that damage to the furnace body 14 caused by direct contact of carbon fire with the furnace wall is reduced; the top of the hearth 36 in the cylinder is provided with a secondary combustion chamber 24 and a tertiary combustion chamber 17; the furnace body 14 is provided with furnace body cooling fins 52 on the outer wall.

In the drawings, the heat radiation system is composed of a heat collecting tank 10, a dust collecting tank 27, a waste heat recovery tank 29, a heat radiation pipe, a furnace body, and a heat radiation fin 52 or a fin. The heat collection box 10 is characterized by being a square hexahedron, the bottom surface of the heat collection box is connected with a furnace body 14 through a furnace neck 6 to form a three-time combustion chamber flue gas outlet 9, the front surface of the box body is provided with a heat collection box movable cover 7, the interior of the box is divided into an upper layer and a lower layer through a heat collection box partition plate 9, and the surface of the box body is provided with a heat collection box fin 11 or a heat collection box movable cover fin 49; the ash accumulation box 27 and the waste heat recovery box 29 are connected hexahedrons separated by a waste heat recovery box partition plate 28, and are box bodies with heat dissipation functions at the same time; an ash accumulation box fin 26 is arranged outside the ash accumulation box 27, and the bottom of the waste heat recovery box 29 is supported by a waste heat recovery box support 42; the heat collecting box 10 is connected with the dust collecting box 27 through five radiating pipes, one end of each of two parallel radiating pipes 13 is connected with two sides of the top end of the dust collecting box 27, and the other end of each of the two parallel radiating pipes is connected with two sides of the top end of the upper layer of the heat collecting box 10 in parallel; one end of each of the two inclined radiating pipes 16 is communicated with two sides of the bottom end of the dust accumulation box 27, the other end of each of the two inclined radiating pipes is connected with two sides of the bottom end of the lower layer of the heat collecting box 10 in a downward inclining mode and is communicated with the smoke outlet 8 of the tertiary combustion chamber, and tar condensed by the dust accumulation box 27 and the radiating pipes can automatically flow back to the tertiary combustion chamber 17 to be combusted due to the inclined angle; a smoke-discharging radiating pipe 21 is obliquely communicated with an ash-accumulating box 27 from the middle part of the upper layer of the heat collecting box 10, one end of a smoke cooling pipe 31 is connected with the smoke-discharging radiating pipe 21, the other end of the smoke cooling pipe passes through the middle part of the ash-accumulating box, a partition plate 28 of a waste heat recovery box and a middle shaft of an inner cavity 34 of the waste heat recovery box 29 and penetrates out of the tail end of the waste heat recovery box 29 to form a smoke flue decoking port 50, and the tail end of the smoke cooling pipe 31 is provided with a smoke flue decoking movable cover 35; the smoke exhaust pipe 30 penetrates into an inner cavity 34 of the waste heat recovery tank from the middle of the top of the waste heat recovery tank 29 and is communicated with the smoke cooling pipe 31; the combination or connection forms that the smoke overflowing from the smoke outlet 8 of the tertiary combustion chamber reaches the lower layer of the heat collecting box 10, the smoke is shunted to the dust accumulating box 27 from the two inclined radiating pipes 16 and then respectively reflows to the upper layer of the heat collecting box 10 from the two parallel radiating pipes 13 at the top, the smoke reaching the upper layer of the heat collecting box 10 flows into the smoke radiating pipe 21 again to reach the smoke cooling pipe 31, the smoke is discharged to the smoke exhaust pipe 26 after being subjected to the waste heat recovery of the primary oxygen supply flow in the smoke cooling pipe 31, and the smoke flows circularly and effectively improves the thermal efficiency of the hot blast stove.

In the figure, the waste heat recovery combustion-supporting temperature control device comprises a waste heat recovery tank 25 and a primary oxygen supply device. The top end of one side of the tail part of the waste heat recovery tank 25 is provided with a waste heat recovery tank inlet 33 which is connected with a waste heat recovery air inlet guide pipe 43, and the oxygen supply blower is connected with a primary oxygen supply blower interface 48; a waste heat recovery hot air outlet 32 is formed in the middle of the bottom end of the other side of the waste heat recovery box 25, a waste heat recovery hot air guide pipe 37 is connected with the waste heat recovery hot air outlet 32, a primary oxygen supply diversion pipe I4 is connected with a primary oxygen supply port I2 at a hot air diversion pipe interface 56 at the upper part of an ash groove 46 on the side surface of the hot blast stove, hot air after waste heat recovery of the waste heat recovery box 27 is sent to the lower layer of a grate 40 of a feed port 2 for oxygen supply, a primary oxygen supply diversion pipe II 54 is connected with a primary oxygen supply port II 41, and hot air after waste heat recovery of the waste heat recovery box 27 is sent to the upper part of the grate 40 at the tail end of a hearth 36 for oxygen supply; the air port of the first oxygen supply port II 41 is towards the direction of the feed inlet, and the air port of the first oxygen supply port I3 is upwards inclined by 45 degrees; the structure ensures that when primary oxygen flow passes through the inner cavity 34 of the waste heat recovery box, the primary oxygen flow absorbs the heat of the flue gas cooling pipe 31 and the box body, and the heated air flow is shunted from the hot air guide pipe 37 and is sent into the hearth 36 for combustion supporting, so that the combustion efficiency can be effectively improved, and the energy loss of smoke exhaust can be reduced; when the blower stops working, oxygen is supplied into the hearth 36 from the air inlet side of the blower by means of the suction force of the smoke exhaust pipe 30 in the hearth 36, the weak combustion state of biomass fuel in the hearth 36 is kept, the intermittent oxygen supply of the blower can meet the effects that the biomass fuel is used as fuel oil combustion ignition sources with different flash points and the temperature of the hot blast stove is automatically controlled.

In the attached drawings, the multiple air intake combustion-supporting device is a structure that high-temperature mixed flue gas formed by fuel in a hearth 36 after primary oxygen supply combustion supporting passes through secondary and tertiary oxygen supply continuous combustion processes respectively; the upper part of a hearth 36 in the cylinder is sealed into a secondary oxygen supply cavity 22 and a tertiary combustion chamber 17 by a secondary oxygen supply cavity clapboard 15 and a tertiary combustion chamber clapboard 12, one end of the secondary oxygen supply cavity clapboard 15 and one end of the tertiary combustion chamber clapboard 12 which are close to the tail part of a furnace body 14 are vertically bent to be connected with the top part of the furnace body into a hollow inverted L-shaped secondary oxygen supply cavity 22, the middle part of the secondary oxygen supply cavity 22 at the bent part is communicated with the mixed flue gas channel at the inner sides of the tertiary combustion chamber 17 and a hearth rear sealing plate 25 by an iron pipe provided with an oxygen supply hole 20 to form a mixed flue gas secondary combustion chamber 24, and a fire head 19 is arranged at the outlet of the secondary combustion chamber 24; secondary oxygen supply holes 20 are arranged on the partition board of the bent part of the secondary oxygen supply cavity 22 and at the outlet of the flue gas channel of the hearth 36; the third oxygen supply hole 18 is arranged on the partition plate 12 of the third combustion chamber close to the bottom of the fire head 19, and the third oxygen supply hole 18 is arranged on the partition plate 12 at the bottom and the middle part of the smoke outlet of the third combustion chamber; one end of the secondary oxygen supply air inlet pipe 45 is connected with a blower at a secondary oxygen supply fan interface 47, and the other end of the secondary oxygen supply air inlet pipe penetrates through the secondary combustion chamber 24 from the outside of the hearth rear sealing plate 25 and is communicated with the secondary oxygen supply cavity 22 to form a secondary oxygen supply port 23; the secondary oxygen supply blower charges oxygen into the secondary oxygen supply cavity 22 through a secondary oxygen supply air inlet duct 45 and a secondary oxygen supply port 23, air pressure formed in the secondary oxygen supply cavity 22 overflows to the secondary oxygen supply hole 20 and the tertiary oxygen supply hole 18, and a structure for supplying oxygen to the secondary combustion chamber 24 and the tertiary combustion chamber 17 is formed; through comprehensive oxygen supplementation of primary combustion flame and a flue gas path, flue gas is fully combusted in the secondary combustion chamber 24 and the tertiary combustion chamber 17, high-temperature flue gas flows to the heat collection box 10 through the flue gas outlet 8, and is discharged from the smoke exhaust pipe 30 after being subjected to radiator circulation and waste heat recovery of a waste heat recovery box.

In the attached drawings, the gas or fuel oil co-combustion heat supply device is a hot blast stove component which skillfully utilizes the characteristics of the hot blast stove and flexibly uses clean energy such as methane, natural gas, kerosene, diesel oil, alcohol-based fuel and the like to co-combust with biomass fuel or independently combust for heat supply. The structure is characterized in that an opening is arranged above a secondary primary oxygen supply opening 41 of a rear sealing plate 25 of the hearth at the tail part of the hearth 36, and a gas inlet pipe 44 and a gas burner 39 are arranged; when the fuel conveyed by the device is methane or coal gas or natural gas, a special booster pump and an electromagnetic valve are required to be installed in series in front of the gas source gas conveying pipe, the gas outlet of the electromagnetic valve is connected with a gas inlet pipe 44, and the booster pump, the electromagnetic valve and the power supplies of the primary and secondary oxygen supply blowers are connected in parallel with a controller, so that the automatic control of synchronous mixed combustion of clean energy and biomass fuel in the hearth 36 is realized; when the delivered fuel is kerosene, diesel oil or alcohol-based fuel, a special atomizing device is required to be additionally arranged and connected with a gas inlet pipe 44 for gas supply and mixed combustion; if the hot-blast stove fuel uses any one of the above fuel gas and fuel oil alone, the automatic ignition device is arranged in the fire head 39, so that the fuel gas and fuel oil combustion heat supply and the automatic control of the heat supply temperature can be realized.

Claims

1. The invention relates to a co-combustion type hot blast stove for drying agricultural products, which is characterized by comprising a stove body, a multi-air-inlet combustion-supporting device, a heat dissipation system, a waste heat recovery combustion-supporting self-temperature control device, a gas or fuel co-combustion heating device and a smoke exhaust pipe; the hot blast stove is arranged in a hot blast exchange chamber of the oven or in a structure of arranging the intermediate heat exchange chamber of the oven at two ends, and only a feed inlet furnace door (1), a smoke exhaust pipe (30) and an ash outlet groove door (55) are exposed out of the hot blast exchange chamber.

2. The co-firing hot blast stove for drying agricultural products according to claim 1, wherein the stove body (14) is an oval cylinder made of a hot rolled plate, the cylinder is horizontally disposed with a major axis perpendicular to a horizontal plane, a lower end of the cylinder is a bottom, an upper end of the cylinder is a top, and a hot blast stove foot rest (5) is provided at the bottom; the furnace body structure comprises a primary combustion chamber hearth (36), a secondary combustion chamber (24) and a tertiary combustion chamber (17); one end of a barrel body of a furnace body (14) is a feeding hole (2) and is provided with a pressure-resistant sealing furnace door 1, the other end of the barrel body is provided with a furnace chamber rear sealing plate (25), the outer side of the lower part of the rear sealing plate (25) is provided with an ash accumulation groove (46), an ash discharge hole (53) formed in the bottom end is connected with the ash accumulation groove (46), the outer opening of the ash accumulation groove (46) is provided with an ash discharge groove door (55), and the ash discharge hole (53) is communicated with an air inlet channel and an ash falling groove (38) at the bottom of a furnace grate (40) and is connected with the ash accumulation groove (46) to form the tail part of the furnace body; a grate (40) is arranged at the lower part in the cylinder body to divide the cylinder body into an upper hearth (36), a lower air inlet channel and an ash falling groove (38); two sides of the grate (40) are provided with vertical grate guards (51); a secondary combustion chamber (24) and a tertiary combustion chamber (17) are arranged at the top of a hearth (36) in the cylinder; furnace body cooling fins (52) are arranged on the outer wall of the furnace body (14).

3. The co-combustion type hot blast stove for drying agricultural products according to claim 1, wherein the heat dissipation system is composed of a heat collection tank (10), an ash accumulation tank (27), a waste heat recovery tank (29), a heat dissipation pipe (13, 16, 21), a stove body and a heat dissipation fin (52) or a fin; the heat collection box (10) is characterized by being a square hexahedron, the bottom surface of the square hexahedron is connected with a furnace body (14) through a furnace neck (6) to form a three-time combustion chamber flue gas outlet (8), the front surface of the square hexahedron is provided with a heat collection box movable cover (7), the interior of the box is divided into an upper layer and a lower layer through a heat collection box partition plate (9), and the surface of the box body is provided with a heat collection box fin (11) or a heat collection box movable cover fin (49); the ash accumulation box (27) and the waste heat recovery box (29) are connected hexahedrons separated by a waste heat recovery box partition plate (28), ash accumulation box fins (26) are arranged on two sides and the top surface of the ash accumulation box (27) body, and the bottom of the waste heat recovery box (29) is supported by a waste heat recovery box support (42); the heat collecting box (10) of the heat radiating device is connected with the dust collecting box (27) through five heat radiating pipes, one end of each of two parallel heat radiating pipes (13) is connected with two sides of the top end of the dust collecting box (27), and the other end of each of the two parallel heat radiating pipes is connected with two sides of the top end of the upper layer of the heat collecting box (10) in parallel; one ends of the two inclined radiating pipes (16) are communicated with two sides of the bottom end of the ash accumulation box (27), and the other ends of the two inclined radiating pipes are declined to be communicated with two sides of the bottom end of the lower layer of the heat collecting box (10) and are communicated with a smoke outlet (8) of the tertiary combustion chamber; the smoke-discharging radiating pipe (21) is obliquely communicated with the ash-accumulating box (27) from the middle part of the upper layer of the heat collecting box (10), one end of the smoke-discharging cooling pipe (31) is connected with the smoke-discharging radiating pipe (21), the other end of the smoke-discharging cooling pipe penetrates through a residual heat recovery box partition plate (28) in the middle of the ash-accumulating box (27) and a middle shaft of an inner cavity (34) of the residual heat recovery box (29) and penetrates out of the tail end of the residual heat recovery box (29) to form a smoke channel coke-removing opening (50), and the tail end of the smoke-discharging cooling pipe (31) is provided with a smoke channel coke-removing movable cover (35); the smoke exhaust pipe (30) penetrates into an inner cavity (34) of the waste heat recovery tank from the middle of the top of the waste heat recovery tank (29) and is communicated with the smoke cooling pipe (31); the connection mode and the structure are the main characteristics of the heat dissipation device.

4. The co-combustion type hot blast stove for drying agricultural products according to claim 1, wherein the waste heat recovery combustion-supporting temperature control device is composed of a waste heat recovery tank (25) and a primary oxygen supply device; the top end of one side of the tail part of the waste heat recovery box (25) is provided with a waste heat recovery box inlet (33) which is connected with a waste heat recovery air inlet guide pipe (43), and the oxygen supply blower is connected with a primary oxygen supply blower interface (48); a waste heat recovery hot air outlet (32) is formed in the middle of the bottom end of the other side of the waste heat recovery box (25), a waste heat recovery hot air guide pipe (37) is connected with the waste heat recovery hot air outlet (32), a primary oxygen supply diversion pipe I (4) is connected with a primary oxygen supply port I (2) at a hot air diversion pipe interface (56) at the upper part of an ash chute (46) on the side area of the hot blast stove, and a primary oxygen supply diversion pipe II (54) is connected with a primary oxygen supply port II (41); the tuyere of the primary oxygen supply port II (41) faces the direction of the feed inlet, and the tuyere of the primary oxygen supply port I (3) inclines upwards by 45 degrees; the structure forms a waste heat recovery combustion-supporting temperature control device.

5. The co-combustion type hot blast stove for drying agricultural products according to claim 1, wherein the multi-intake combustion supporting device is a combined structure of a hearth (36) in which fuel is continuously combusted by primary, secondary and tertiary oxygen supply; the device structure is that a secondary oxygen supply cavity clapboard (15) and a tertiary combustion chamber clapboard (12) are used for sealing the upper part of a hearth (36) in a cylinder body to form a secondary oxygen supply cavity (22) and a tertiary combustion chamber (17), one end of the secondary oxygen supply cavity clapboard (15) and one end of the tertiary combustion chamber clapboard (12) which are close to the tail part of a furnace body (14) are vertically bent to form an inverted L-shaped secondary oxygen supply cavity (22) which is internally connected with the top part of the furnace body, an iron pipe with a secondary oxygen supply hole (20) is used for communicating the tertiary combustion chamber with a mixed flue gas channel at the inner side of a rear sealing plate (25) of the hearth in the middle part of the secondary oxygen supply cavity (22) at the bent part to form a mixed flue gas secondary combustion chamber (24), and a fire head (19) is arranged at the outlet of the secondary combustion chamber (24); secondary oxygen supply holes (20) are arranged on the partition board of the bent part of the secondary oxygen supply cavity (22) and at the outlet of the flue gas channel of the hearth (36); a tertiary oxygen supply hole (18) is arranged on a tertiary combustion chamber partition plate (12) close to the bottom of a fire head (19), and meanwhile, tertiary oxygen supply holes (18) are arranged on partition plates (12) at the bottom and the middle part of a smoke outlet (8) of the tertiary combustion chamber; one end of the secondary oxygen supply air inlet guide pipe (45) is connected with a blower at a secondary oxygen supply fan interface (47), and the other end of the secondary oxygen supply air inlet guide pipe penetrates through a secondary combustion chamber (24) from the outside of the hearth rear sealing plate (25) and is communicated with a secondary oxygen supply cavity (22) to form a secondary oxygen supply port (23); the secondary oxygen supply blower charges oxygen into the secondary oxygen supply cavity (22) through a secondary oxygen supply air inlet duct (45) and a secondary oxygen supply port (23), and air pressure formed in the secondary oxygen supply cavity (22) overflows to the secondary oxygen supply hole (20) and the tertiary oxygen supply hole (18) to form an oxygen supply structure for the secondary combustion chamber (24) and the tertiary combustion chamber (17).

6. The co-combustion type hot blast stove for drying agricultural products according to claim 1, wherein the gas or oil co-combustion heat supply device is a device for supplying heat by burning clean energy such as biogas, natural gas, kerosene, diesel oil, alcohol-based fuel mixed with biomass fuel or by burning the clean energy alone; the device is structurally characterized in that an opening is formed above a secondary primary oxygen supply opening (41) of a rear sealing plate (25) of the hearth at the tail part of the hearth (36), and a gas inlet pipe (44) and a gas burner (39) are installed.