Straw bale burning direct combustion grain drying hot air furnace

Abstract

The invention discloses a straw bale burning direct-combustion grain drying hot air furnace, comprising: a refractory brick furnace, a chain grate, a straw drying and breaking chamber, an air-cooled material shifting device, and a feeding device; the refractory brick furnace is provided with a front wall, a rear arch, a separation wall, etc., and has a semi-gasification combustion chamber, a fixed carbon burnout chamber, and an enhanced combustion chamber; the chain grate is horizontally arranged at the bottom of the straw drying and breaking chamber and the refractory brick furnace; the straw drying and breaking chamber is arranged in front of the feeding port of the refractory brick furnace, and an air-cooled straw breaking device capable of supplying oxygen to the enhanced combustion chamber is arranged inside the chamber; the feeding device is used to transport the straw bale into the straw drying and breaking chamber. The invention solves the problem of direct combustion of straw bale burning; the straw bale can be broken quickly; continuous feeding and continuous slag discharge are possible; the refractory brick furnace adopts staged combustion, which improves the combustion effect and reduces the concentration of nitrogen oxides generated; the air-cooled material shifting device can also disperse and burn the unburned straw fuel in the fixed carbon burnout chamber.

Description

Technical Field

[0001] The invention relates to the technical field of straw burning, and in particular to a straw bundle burning direct combustion grain drying hot air furnace. Background Art

[0002] At present, the hot air furnaces of most grain drying enterprises in my country use coal as fuel. The smoke, sulfur dioxide, nitrogen oxides, etc. produced by coal combustion cause coal smoke pollution in the atmosphere. However, due to the gradual shortage of fossil energy, the combustion and utilization of biomass straw has begun to attract widespread attention. Biomass energy is the only renewable clean energy on the earth. Because of its high volatile content, strong carbon activity, and low environmental harm to post-combustion emissions, it is very suitable for large-scale development and conversion utilization, and is an environmentally friendly fuel. However, with the development of my country's national economy, the energy structure of my country's vast rural areas has also undergone tremendous changes. A large amount of straw has been abandoned or burned on the spot in the fields, causing serious waste of resources and environmental pollution. At present, the utilization methods of straw in my country mainly include direct combustion, pyrolysis and fermentation, and the straw combustion utilization methods mainly include traditional scattered burning, suspended combustion, dense molding combustion, and baled combustion. However, among these four combustion methods, traditional scattered burning has low efficiency; suspended combustion has serious fly ash and straw is not easy to transport; dense molding combustion consumes a lot of energy; and the straw baling combustion method combines the advantages of the above three combustion methods. The baling method increases the density of straw biomass, which is convenient for transportation and storage. At the same time, the baling method consumes less energy than the compression molding method. Therefore, baling combustion is the most promising combustion method in the future.

[0003] However, the current straw bale burning cannot ensure that the straw bale is fully burned. The straw bale is burned naturally in the furnace with the help of a blower. Not only is the combustion speed slow, but the straw is not burned completely and the thermal efficiency is low. Therefore, how to solve the shortcomings of the current straw bale burning technology and provide a straw bale burning direct-fired grain drying hot air furnace that can fully burn the straw bale in the furnace, has high thermal efficiency, and is energy-saving and environmentally friendly is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] To this end, the purpose of the present invention is to propose a straw bale burning direct-fired grain drying hot air furnace to effectively solve the above-mentioned problems existing in the existing straw bale burning technology, and its specific technical solution is as follows:

[0005] A straw bale burning direct-fired grain drying hot air furnace, comprising: a refractory brick furnace, a chain grate, a straw drying and breaking chamber, an air-cooled material shifting device, and a feeding device;

[0006] A feed port is provided on the front wall of the refractory brick furnace, and the feed port is used to transport the broken straw into the refractory brick furnace through the chain grate. A rear arch is provided at the rear end of the refractory brick furnace, and a partition wall is provided between the front wall and the rear arch of the refractory brick furnace, and the partition wall, the front wall and the refractory brick furnace together form a semi-gasification combustion chamber; the rear arch top wall, the partition wall and the refractory brick furnace together form an enhanced combustion chamber; the rear arch lower wall, the partition wall and the refractory brick furnace together form a fixed carbon burnout chamber, and a flame nozzle connecting the semi-gasification combustion chamber and the enhanced combustion chamber is provided on the partition wall, and a flue gas outlet connecting the enhanced combustion chamber and the fixed carbon burnout chamber is provided on the end of the rear arch close to the partition wall, and a high-temperature flue gas outlet is provided at the rear upper part of the enhanced combustion chamber, and the high-temperature flue gas outlet is connected to the flue gas inlet of the heat exchanger;

[0007] The straw drying and breaking chamber is arranged in front of the feed port of the refractory brick furnace, and an air-cooled straw breaking device is arranged inside the chamber; the air-cooled straw breaking device comprises a breaking roller assembly, which is fixed to the side wall of the straw drying and breaking chamber through bearing seats at both ends to break the straw bales, one end of the breaking roller assembly is connected to the first blower through an air duct, and the other end is connected to the enhanced combustion chamber through an air duct;

[0008] The chain grate is horizontally arranged at the bottom of the straw drying and breaking chamber and the refractory brick furnace, and there is a gap between the top surface of the chain grate and the upper end of the feed port at the lower part of the front wall of the refractory brick furnace and the bottom end of the isolation wall; a plurality of air chambers are arranged below the chain grate along its conveying direction;

[0009] The air-cooled material-dispensing device is arranged at the lower part of the fixed carbon burnout chamber in the refractory brick furnace and above the chain grate, and the air-cooled material-dispensing device comprises a material-dispensing roller assembly, which is fixed to the side wall of the refractory brick furnace through bearing seats at both ends, so as to disperse and burn the unburned straw fuel;

[0010] The feeding device is arranged at the front end of the straw drying and breaking chamber, and is used for conveying the straw bales into the straw drying and breaking chamber.

[0011] By adopting the above technical scheme, the present invention provides a straw bale burning direct combustion grain drying hot air furnace. First, it solves the problem of direct combustion of straw bales. The straw bales are transported to the straw drying and breaking chamber through the feeding device. In the straw drying and breaking chamber, they are broken by the breaking roller assembly and dried by the radiation of flue gas at the same time, which reduces the moisture in the straw. At the same time, the density of the straw becomes smaller after the straw bale is broken, which is beneficial to the combustion of the straw bale in the furnace after the straw bale is broken.

[0012] Second, the bag breaking roller assembly of the present invention can quickly break the straw bales, and the scattered straw can also be initially burned off in the straw drying and breaking chamber, so as to improve the subsequent combustion effect. At the same time, one end of the bag breaking roller assembly is connected to the first blower through the air duct, and the other end is connected to the air duct and sends the hot air for cooling the bag breaking roller assembly to the enhanced combustion chamber of the refractory brick furnace through the air duct, achieving the dual effects of cooling the bag breaking roller assembly and injecting oxygen into the enhanced combustion chamber of the refractory brick furnace.

[0013] Third, since the refractory brick furnace in the present invention adopts staged combustion of semi-gasification combustion chamber, fixed carbon burnout chamber and enhanced combustion chamber, it not only improves the combustion effect, but also produces low concentration of nitrogen oxides, achieving energy-saving and environmental protection effects.

[0014] Fourthly, the present invention can realize continuous feeding and continuous slag discharging due to the adoption of the chain grate.

[0015] Fifthly, the present invention also installs an air-cooled material-moving device in the refractory brick furnace, which can disperse and burn the unburned straw fuel in the fixed carbon burnout chamber.

[0016] Sixth, the present invention uses a heat exchanger to heat the high-temperature smoke generated in the refractory brick furnace, and the high-temperature clean air after the heat exchange is used for grain drying.

[0017] On the basis of the above technical solution, the present invention can also make the following improvements:

[0018] Preferably, the bale breaking roller assembly includes two bale breaking roller main shaft tubes arranged side by side in the straw drying bale breaking chamber; both ends of each bale breaking roller main shaft tube are rotatably connected to the two side walls inside the straw drying bale breaking chamber through bearing seats and the two bale breaking roller main shaft tubes rotate in opposite directions; the outer ring side walls of the two bale breaking roller main shaft tubes are provided with a plurality of bale breaking thorns; the interiors of the two bale breaking roller main shaft tubes are air ducts; one end of the air ducts of the two bale breaking roller main shaft tubes are connected to the first blower through air ducts, and the other end is connected to the enhanced combustion chamber through air ducts.

[0019] The two bale breaking roller main shaft tubes rotating in opposite directions are provided with bale breaking thorns, which can quickly break the straw bales. The scattered straw can also be initially burned off in the straw drying and bale breaking chamber to improve its subsequent combustion effect. The two bale breaking roller main shaft tubes are connected to the first blower through the internal air duct, which can ensure that the bale breaking roller main shaft tubes, bearing seats and other structures will not be damaged by being in a high temperature state for a long time, thereby ensuring the working ability of these structures and extending their service life.

[0020] At the same time, the other end of the air duct of the two breaking roller main shaft tubes away from the first blower is connected to the enhanced combustion chamber through the air duct, and the hot air after cooling the breaking roller main shaft tube can be sent to the enhanced combustion chamber through the air duct to inject oxygen into the enhanced combustion chamber of the refractory brick furnace.

[0021] Preferably, a bale breaking roller sprocket is installed at one end of the two bale breaking roller main shaft tubes in the same direction, and at the same time, a first transmission motor is installed on the outer wall of the straw drying bale breaking chamber on one side of the end, and the first transmission motor is located between the two bale breaking roller sprockets, and two first transmission motor sprockets opposite to the two bale breaking roller sprockets are respectively installed on the output shaft of the first transmission motor, and the bale breaking roller sprocket and the corresponding first transmission motor sprocket are driven by a chain.

[0022] Preferably, the material dispensing roller assembly includes two material dispensing roller main shaft tubes arranged side by side in the refractory brick furnace; both ends of each material dispensing roller main shaft tube are rotatably connected to the side walls on both sides of the refractory brick furnace through bearing seats; the outer ring side walls of the two material dispensing roller main shaft tubes are provided with a plurality of material dispensing spikes; the interiors of the two material dispensing roller main shaft tubes are air ducts; the outer ring side walls of the two material dispensing roller main shaft tubes are also provided with a plurality of air holes communicating with the air ducts; one end of one of the material dispensing roller main shaft tubes is connected to the second blower through an air duct, and one end of the other material dispensing roller main shaft tube in the same direction is sealed, and the other ends of the two material dispensing roller main shaft tubes in the same direction are connected through an air duct.

[0023] The two rotatable feed roller main shaft tubes are provided with feed barbs, which can disperse and burn the unburned fuel; the two feed roller main shaft tubes are connected to the second blower through the internal air duct, which can ensure that the feed roller main shaft tubes, bearing seats and other structures will not be damaged by being in a high temperature state for a long time, thereby ensuring the working ability of these structures and extending their service life.

[0024] At the same time, one end of one of the feed roller main shaft tubes is connected to the second blower through an air duct, and the other end is connected to the other feed roller main shaft tube through the air duct. The other end of the other feed roller main shaft tube is sealed. Air holes are opened on the two feed roller main shaft tubes. The cooling air entering the feed roller main shaft tube supplies oxygen to the unburned fuel through the air holes, which can further promote the combustion of the fuel.

[0025] Preferably, a feed roller sprocket is installed at one end of the two feed roller main shaft tubes in the same direction, and at the same time, a second transmission motor is installed on the outer wall of the refractory brick furnace on one side of the end, and the second transmission motor is located between the two feed roller sprockets. Two second transmission motor sprockets opposite to the two feed roller sprockets are respectively installed on the output shaft of the second transmission motor, and the feed roller sprocket and the corresponding second transmission motor sprocket are driven by a chain.

[0026] Preferably, the feeding device includes a feeding device body, a lifting bracket for supporting the straw bale is provided inside the feeding device body, the lifting bracket is driven by a lifting mechanism to move up and down, and a bracket guide mechanism for guiding the lifting bracket to move up and down is also provided on the two side walls inside the feeding device body.

[0027] Preferably, there is a gap of 1000-1300mm between the upper end of the feed port at the lower part of the front wall of the refractory brick furnace and the top surface of the chain grate; there is a gap of 800-1000mm between the bottom end of the isolation wall and the top surface of the chain grate, ensuring that the broken straw bales enter the refractory brick furnace.

[0028] Preferably, the wind chamber is an isobaric wind chamber and is evenly distributed below the chain grate to evenly transport oxygen required for straw combustion into the refractory brick furnace.

[0029] Preferably, a recycling device for recycling straw combustion waste residue is provided at the rear end of the chain grate.

[0030] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a straw bale burning direct-fired grain drying hot air furnace, which has the following beneficial effects:

[0031] 1. The straw does not need to be processed into pellets or briquettes and can be burned directly, eliminating the intermediate processing steps and thus greatly reducing operating costs.

[0032] 2. After the straw bale is broken, the density of the straw is small, and the combustion temperature does not reach the ash melting point of the straw ash, so it is not easy to coke during combustion.

[0033] 3. As it adopts chain grate, it can continuously feed and discharge slag.

[0034] 4. The staged combustion of the semi-gasification combustion chamber, fixed carbon burnout chamber and enhanced combustion chamber not only improves the combustion effect, but also produces low concentration of nitrogen oxides, achieving the effect of energy saving and environmental protection.

[0035] 5. The lifting loading device is used to realize the automatic loading of straw bales.

[0036] 6. The air-cooled straw bale breaking device and the air-cooled material-discharging device both adopt an air-cooled cooling structure, which ensures that the bale breaking roller assembly, the material-discharging roller assembly and the corresponding bearing seats and other structures will not be damaged by being in a high temperature state for a long time, thereby ensuring the working reliability of these structures.

[0037] 7. The problem of complete combustion of straw in the fixed carbon burnout chamber of the refractory brick furnace is solved. If the moisture content of the crushed and burned straw seriously exceeds the standard, it cannot be completely burned in the furnace. However, with the rotation of the main shaft tube of the two-stage feeding roller and the supply of oxygen, the straw can be fully burned.

[0038] 8. The hot air cooled in the air-cooled straw bale breaking device of the present invention is further sent to the enhanced combustion chamber of the refractory brick furnace through the air duct to inject oxygen into it so that it can be burned more fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0040] Figure 1 The accompanying drawing is a schematic diagram of the main cross-section structure provided by the present invention.

[0041] Figure 2 The attached picture is Figure 1 Schematic diagram of the top cross-sectional structure.

[0042] Among them, in the figure,

[0043] 1-refractory brick furnace, 2-chain grate, 3-straw drying and breaking chamber, 4-air-cooled feeding device, 5-feeding device, 6-feeding port, 7-front wall, 8-rear arch, 9-separation wall, 10-semi-gasification combustion chamber, 11-enhanced combustion chamber, 12-fixed carbon burnout chamber, 13-fire nozzle, 14-smoke outlet, 15-high-temperature smoke outlet, 16-air-cooled straw breaking device, 17-breaking roller main shaft tube, 18-bearing Seat, 19-package breaking thorn, 20-air duct, 21-first blower, 22-air duct, 23-first transmission motor, 24-first transmission motor sprocket, 25-chain, 26-material dispensing roller main shaft tube, 27-material dispensing thorn, 28-air hole, 29-second blower, 30-second transmission motor, 31-material dispensing roller sprocket, 32-feeding device body, 33-lifting bracket, 34-lifting mechanism, 35-bracket guide mechanism. DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0045] Example:

[0046] According to the following Figure 1-2A straw bale burning direct combustion grain drying hot air furnace according to an embodiment of the present invention is described in detail.

[0047] See attached Figure 1 and attached Figure 2 The embodiment of the present invention discloses a straw bale burning direct combustion grain drying hot air furnace, comprising: a refractory brick furnace 1, a chain grate 2, a straw drying and breaking chamber 3, an air-cooled material shifting device 4, and a feeding device 5;

[0048] A feed port 6 is provided on the front wall 7 of the refractory brick furnace 1, and the feed port 6 is used to transport the broken straw into the refractory brick furnace 1 through the chain grate 2. A rear arch 8 is provided at the rear end of the refractory brick furnace 1, and a partition wall 9 is provided between the front wall 7 and the rear arch 8 of the refractory brick furnace 1. The partition wall 9, the front wall 7 and the refractory brick furnace 1 together form a semi-gasification combustion chamber 10; the top wall of the rear arch 8, the partition wall 9 and the refractory brick furnace 1 together form an enhanced combustion chamber 11; the lower wall of the rear arch 8, the partition wall 9 and the refractory brick furnace 1 together form a fixed carbon burnout chamber 12, and a flame nozzle 13 connecting the semi-gasification combustion chamber 10 and the enhanced combustion chamber 11 is provided on the partition wall 9. A smoke outlet 14 connecting the enhanced combustion chamber 11 and the fixed carbon burnout chamber 12 is opened at the end of the rear arch 8 close to the partition wall 9, and a high-temperature smoke outlet 15 is provided at the rear upper part of the enhanced combustion chamber 11, and the high-temperature smoke outlet 15 is connected to the smoke inlet of the heat exchanger.

[0049] The straw drying and bale breaking chamber 3 is arranged in front of the feed port 6 of the refractory brick furnace 1, and an air-cooled straw bale breaking device 16 is arranged inside the chamber; the air-cooled straw bale breaking device 16 includes a bale breaking roller assembly, which is fixed to the side wall of the straw drying and bale breaking chamber 3 through bearing seats 18 at both ends to break the straw bales, one end of the bale breaking roller assembly is connected to the first blower 21 through the air duct 22, and the other end is connected to the enhanced combustion chamber 11 through the air duct 22.

[0050] Specifically, the bale breaking roller assembly includes two bale breaking roller main shaft tubes 17 arranged side by side in the straw drying bale breaking chamber 3; both ends of each bale breaking roller main shaft tube 17 are rotatably connected to the side walls on both sides of the straw drying bale breaking chamber 3 through bearing seats 18, and the two bale breaking roller main shaft tubes 17 rotate in opposite directions; the outer ring side walls of the two bale breaking roller main shaft tubes 17 are provided with a plurality of bale breaking spikes 19; the interiors of the two bale breaking roller main shaft tubes 17 are both air ducts 20; one end of the air ducts 20 of the two bale breaking roller main shaft tubes 17 are respectively connected to the first blower 21 through the air duct 22, and the other end is respectively connected to the enhanced combustion chamber 11 through the air duct 22.

[0051] A bale breaking roller sprocket is installed at one end of the two bale breaking roller main shaft tubes 17 in the same direction, and at the same time, a first transmission motor 23 is installed on the outer wall of the straw drying bale breaking chamber 3 on one side of the end, and the first transmission motor 23 is located between the two bale breaking roller sprockets. Two first transmission motor sprockets 24 corresponding to the two bale breaking roller sprockets are respectively installed on the output shaft of the first transmission motor 23, and the bale breaking roller sprockets and the first transmission motor sprockets 24 corresponding thereto are driven by chains 25. In other words, the rotation of the bale breaking roller main shaft tube 17 is realized by the first transmission motor 23 driving the chain 25 and the bale breaking roller sprocket.

[0052] The chain grate 2 is horizontally arranged at the bottom of the straw drying and breaking chamber 3 and the refractory brick furnace 1, and there is a gap between the top surface of the chain grate 2 and the upper end of the feed port 6 at the lower part of the front wall 7 of the refractory brick furnace and the bottom end of the isolation wall 9; a plurality of air chambers are arranged below the chain grate 2 along its conveying direction, and the air chambers are isobaric air chambers and are evenly distributed below the chain grate 2.

[0053] Specifically, there is a gap of 1000-1300 mm between the upper end of the feed port 6 at the lower part of the front wall 7 of the refractory brick furnace and the top surface of the chain grate 2; there is a gap of 800-1000 mm between the bottom end of the isolation wall 9 and the top surface of the chain grate 2.

[0054] The rear end of the chain grate 2 is provided with a recycling device for recycling and processing straw combustion waste residue.

[0055] The air-cooled material-dispensing device 4 is arranged at the lower part of the fixed carbon burnout chamber 12 in the refractory brick furnace 1 and above the chain grate 2. The air-cooled material-dispensing device 4 includes a material-dispensing roller assembly, which is fixed to the side wall of the refractory brick furnace 1 through bearing seats 18 at both ends to disperse and burn the unburned straw fuel.

[0056] Specifically, the material-dispensing roller assembly includes two material-dispensing roller main shaft tubes 26 arranged side by side in the refractory brick furnace 1; both ends of each material-dispensing roller main shaft tube 26 are rotatably connected to the side walls on both sides of the refractory brick furnace 1 through bearing seats 18; the outer ring walls of the two material-dispensing roller main shaft tubes 26 are provided with a plurality of material-dispensing spikes 27; the interiors of the two material-dispensing roller main shaft tubes 26 are both air ducts 20; the outer ring walls of the two material-dispensing roller main shaft tubes 26 are also provided with a plurality of air holes 28 communicating with the air duct 20; one end of one of the material-dispensing roller main shaft tubes 26 is connected to the second blower 29 through the air duct 22, and one end of the other material-dispensing roller main shaft tube 26 in the same direction is sealed, and the other ends of the two material-dispensing roller main shaft tubes 26 in the same direction are connected through the air duct 22.

[0057] A feeding roller sprocket 31 is installed at one end of each feeding roller main shaft tube 26 in the same direction, and at the same time, a second transmission motor 30 is installed on the outer wall of the refractory brick furnace 1 on one side of the end, and the second transmission motor 30 is located between the two feeding roller sprockets 31. Two second transmission motor sprockets opposite to the two feeding roller sprockets 31 are respectively installed on the output shaft of the second transmission motor 30, and the feeding roller sprocket 31 and the corresponding second transmission motor sprocket are driven by the chain 25. In other words, the rotation of the feeding roller main shaft tube 26 is realized by the second transmission motor 30 driving the chain 25 and the feeding roller sprocket 31.

[0058] The feeding device 5 is arranged at the front end of the straw drying and breaking chamber 3 to transport the straw bales into the straw drying and breaking chamber 3 .

[0059] Specifically, the feeding device 5 includes a feeding device body 32, inside of which is provided a lifting bracket 33 for supporting the straw bale. The lifting bracket 33 is driven by a lifting mechanism 34 to move up and down. The two side walls inside the feeding device body 32 are also provided with a bracket guide mechanism 35 for guiding the lifting bracket 33 to move up and down.

[0060] The specific working principle of the present invention is:

[0061] The feeding device 5 is used to automatically feed the straw bale into the straw drying and breaking chamber 3 in front of the refractory brick furnace feed port 6. The two bale breaking roller main shaft tubes 17 drive the bale breaking spikes 19 thereon to break the straw bale through counter-rotation. While the straw bale is being broken, it is also radiated by the flue gas to achieve drying. At the same time, the first blower 21 is started to bring cooling air into the bale breaking roller main shaft tube 17, so as to achieve continuous temperature reduction protection for the two bale breaking roller main shaft tubes 17 and other corresponding structures, and the cooled hot air is sent to the enhanced combustion chamber 11 of the refractory brick furnace 1 through the air duct 22 to supply oxygen to the enhanced combustion chamber 11.

[0062] The broken and burned straw falls onto the chain grate 2 through the feed port 6, and the isobaric air chamber at the lower part of the chain grate 2 supplies a proper amount of air. The straw releases a large amount of volatile components after combustion and fills the semi-gasification combustion chamber 10. Since the density of the straw bale decreases after the straw bale is broken, its combustion temperature cannot reach the ash melting point of the straw ash, and it is not easy to coke during combustion. At the same time, the temperature of the semi-gasification combustion chamber 10 is controlled below 800°C, which is lower than the ash melting point, and can effectively prevent coking and inhibit the generation of nitrogen oxides. The gas generated in the semi-gasification combustion chamber 10 enters the enhanced combustion chamber 11 through the flame nozzle 13;

[0063] In the above process, the straw that is not completely burned in the semi-gasification combustion chamber 10 is spread on the chain grate 2 in the space below the isolation wall 9. With the uniform movement of the chain grate 2 and the uniform wind distribution of the isobaric wind chamber, the solid carbon formed is burned and burned in the fixed carbon burnout chamber 12 under the action of the radiant heat of the rear arch 8; the feed roller main shaft tube 26 located at the lower part of the fixed carbon burnout chamber 12 and above the chain grate 2 can further disperse and burn the unburned fuel. At the same time, the second blower 29 is started to bring cooling air into the feed roller main shaft tube 26, so as to realize continuous temperature reduction protection of the two feed roller main shaft tubes 26 and other corresponding structures, and the cooling air supplies oxygen to the unburned fuel through the air holes 28 on the feed roller main shaft tube 26, so that the fuel can be fully burned;

[0064] The high-temperature flue gas formed by the full combustion of the fixed carbon burnout chamber 12 flows through the flue gas outlet 14 into the enhanced combustion chamber 11, and merges with the flue gas ejected from the semi-gasification combustion chamber 10 for secondary combustion. This process realizes phase-separated combined combustion, and the concentration of nitrogen oxides generated is low, which has a good atmospheric environmental protection effect.

[0065] The high-temperature smoke generated in the enhanced combustion chamber 11 flows out from the high-temperature smoke outlet 15, and is heat-exchanged through the heat exchanger. The high-temperature clean air after the heat exchange is used for grain drying.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A straw bale burning direct combustion grain drying hot air furnace, characterized in that: include: Refractory brick furnace (1), chain grate (2), straw drying and bag breaking chamber (3), air-cooled material shifting device (4), and feeding device (5); The front wall (7) of the refractory brick furnace (1) is provided with a feed port (6), and the feed port (6) is used to transport the broken straw into the refractory brick furnace (1) through the chain grate (2); the rear end of the refractory brick furnace (1) is provided with a rear arch (8), and a partition wall (9) is provided between the front wall (7) and the rear arch (8) of the refractory brick furnace (1); the partition wall (9), the front wall (7) and the refractory brick furnace (1) together form a semi-gasification combustion chamber (10); the top wall of the rear arch (8), the partition wall (9) and the refractory brick furnace (1) together form an enhanced combustion chamber (10). chamber (11); the lower wall of the rear arch (8), the isolation wall (9) and the refractory brick furnace (1) together enclose a fixed carbon burnout chamber (12); the isolation wall (9) is provided with a flame vent (13) connecting the semi-gasification combustion chamber (10) and the enhanced combustion chamber (11); the end of the rear arch (8) close to the isolation wall (9) is provided with a smoke outlet (14) connecting the enhanced combustion chamber (11) and the fixed carbon burnout chamber (12); the upper rear portion of the enhanced combustion chamber (11) is provided with a high-temperature smoke outlet (15), and the high-temperature smoke outlet (15) is connected to the smoke inlet of the heat exchanger; The straw drying and bale breaking chamber (3) is arranged in front of the feed port (6) of the refractory brick furnace (1), and an air-cooled straw bale breaking device (16) is arranged inside the chamber; the air-cooled straw bale breaking device (16) comprises a bale breaking roller assembly, which is fixed to the side wall of the straw drying and bale breaking chamber (3) through bearing seats (18) at both ends to break the straw bales; one end of the bale breaking roller assembly is connected to the first blower (21) through an air duct (22), and the other end is connected to the enhanced combustion chamber (11) through the air duct (22); The chain grate (2) is horizontally arranged at the bottom of the straw drying and breaking chamber (3) and the refractory brick furnace (1), and there is a gap between the top surface of the chain grate (2) and the upper end of the feed port (6) at the lower part of the front wall (7) of the refractory brick furnace and the bottom end of the isolation wall (9); a plurality of air chambers are arranged below the chain grate (2) along its conveying direction; The air-cooled material-dispensing device (4) is arranged at the lower part of the fixed carbon burnout chamber (12) in the refractory brick furnace (1) and on the upper part of the chain grate (2), and the air-cooled material-dispensing device (4) comprises a material-dispensing roller assembly, which is fixed to the side wall of the refractory brick furnace (1) through bearing seats (18) at both ends, and is used to disperse and burn unburned straw fuel; The feeding device (5) is arranged at the front end of the straw drying and bale breaking chamber (3) and is used to transport the straw bales into the straw drying and bale breaking chamber (3); The bale breaking roller assembly comprises two bale breaking roller main shaft tubes (17) arranged side by side in the straw drying bale breaking chamber (3); both ends of each bale breaking roller main shaft tube (17) are rotatably connected to the side walls of the straw drying bale breaking chamber (3) via a bearing seat (18), and the two bale breaking roller main shaft tubes (17) rotate in opposite directions; the outer ring walls of the two bale breaking roller main shaft tubes (17) are provided with a plurality of bale breaking spikes (19); the interiors of the two bale breaking roller main shaft tubes (17) are both air ducts (20); one end of the air ducts (20) of the two bale breaking roller main shaft tubes (17) is connected to the first blower (21) via an air duct (22), and the other end is connected to the enhanced combustion chamber (11) via an air duct (22); The material-dispensing roller assembly comprises two material-dispensing roller main shaft tubes (26) arranged side by side in the refractory brick furnace (1); both ends of each material-dispensing roller main shaft tube (26) are rotatably connected to the side walls on both sides of the refractory brick furnace (1) through a bearing seat (18); the outer ring walls of the two material-dispensing roller main shaft tubes (26) are provided with a plurality of material-dispensing thorns (27); the interiors of the two material-dispensing roller main shaft tubes (26) are both air ducts (20); the outer ring walls of the two material-dispensing roller main shaft tubes (26) are also provided with a plurality of air holes (28) communicating with the air ducts (20); one end of one of the material-dispensing roller main shaft tubes (26) is connected to the second blower (29) through an air duct (22), one end of the other material-dispensing roller main shaft tube (26) in the same direction is sealed, and the other ends of the two material-dispensing roller main shaft tubes (26) in the same direction are connected through the air duct (22); A material-pickling roller sprocket (31) is installed at one end of the two material-pickling roller main shaft tubes (26) in the same direction. At the same time, a second transmission motor (30) is installed on the outer wall of the refractory brick furnace (1) on one side of the end. The second transmission motor (30) is located between the two material-pickling roller sprockets (31). Two second transmission motor sprockets opposite to the two material-pickling roller sprockets (31) are respectively installed on the output shaft of the second transmission motor (30). The material-pickling roller sprocket (31) and the corresponding second transmission motor sprocket are driven by a chain (25).

2. A straw bale burning direct combustion grain drying hot air furnace according to claim 1, characterized in that: A bale breaking roller sprocket is installed at one end of the two bale breaking roller main shaft tubes (17) in the same direction. At the same time, a first transmission motor (23) is installed on the outer wall of the straw drying bale breaking chamber (3) on one side of the end. The first transmission motor (23) is located between the two bale breaking roller sprockets. Two first transmission motor sprockets (24) corresponding to the two bale breaking roller sprockets are respectively installed on the output shaft of the first transmission motor (23). The bale breaking roller sprockets and the first transmission motor sprockets (24) corresponding to the bale breaking roller sprockets are driven by chains (25).

3. The straw bale burning direct combustion grain drying hot air furnace according to claim 1, characterized in that: The feeding device (5) comprises a feeding device body (32), a lifting bracket (33) for supporting a straw bale is provided inside the feeding device body (32), the lifting bracket (33) is driven by a lifting mechanism (34) to move up and down, and a bracket guide mechanism (35) for guiding the lifting bracket (33) to move up and down is also provided on the two side walls inside the feeding device body (32).

4. The straw bale burning direct combustion grain drying hot air furnace according to claim 1, characterized in that: There is a gap of 1000-1300 mm between the upper end of the feed port (6) at the lower part of the front wall (7) of the refractory brick furnace and the top surface of the chain grate (2); there is a gap of 800-1000 mm between the bottom end of the isolation wall (9) and the top surface of the chain grate (2).

5. The straw bale burning direct combustion grain drying hot air furnace according to claim 1, characterized in that: The wind chamber is an isobaric wind chamber and is evenly distributed below the chain grate (2).

6. The straw bale burning direct combustion grain drying hot air furnace according to claim 1, characterized in that: A recycling device for recycling straw combustion waste residue is provided at the rear end of the chain grate (2).

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