Direct-fired hot air heat exchange device for round straw bale unbundling

Abstract

The round straw bale unbundling direct-fired hot air heat exchange device belongs to hot air equipment; at the rear of the straw direct-fired hot air stove, it is connected in series with an air-to-air heat exchanger, a cyclone dust collector, a smoke exhaust fan, and a swirl water film dust collector through a smoke exhaust port in sequence; a round straw unbundling machine is arranged outside the fuel feeding port at the front of the straw direct-fired hot air stove; a straw orderly feeding conveyor is installed in a configuration that is interconnected and coordinated between the discharge end of the round straw unbundling machine and the fuel feeding port of the straw direct-fired hot air stove; the straw orderly feeding conveyor is composed of a frame, side plates, upper and lower ring chains, metal tooth plates A, B, tensioning support shafts A, B, drive shafts A, B, a speed regulating motor and sprocket, and a transmission chain assembly; it has the characteristics of uniform and stable output heat load of the straw direct-fired hot air stove, strong adaptability, reliable operation, high thermal efficiency, and low operating cost.

Description

Technical Field

[0001] The invention belongs to hot air equipment, and mainly relates to a hot air heat exchange device for directly burning round straw bales using straw as fuel for drying agricultural products. Background Art

[0002] At present, the biomass raw materials used in my country's grain drying hot air furnaces mainly include straw pellet fuel and whole straw bundle fuel. Among them, straw pellet fuel is made by crushing, drying, briquetting or pelletizing crop straw. There is a large amount of electricity and energy consumed in the briquetting and pelletizing process, resulting in expensive fuel prices. In the absence of national policy subsidies, it is difficult for users to accept its use; whole straw bundle fuel is directly fed into the straw direct-fired hot air furnace for combustion, which greatly reduces the cost of straw fuel. However, there are problems such as uneven and incomplete combustion of straw fuel, which causes the hot air output temperature and thermal energy of the straw combustion hot air furnace to be unstable, affecting and reducing the quality and effect of crop drying operations. In recent years, in order to solve the problems and shortcomings of the whole straw bundle direct-fired method, the patent applicant has developed a round straw bale unpacking machine. The machine is configured in front of the fuel feed inlet of the straw direct-fired hot air furnace and is used in conjunction with it. The disassembled straw is fed into the straw direct-fired hot air furnace for combustion, which preliminarily solves the problems of the whole straw bundle direct-fired method. However, in practical use, it was found that the straw fed directly into the straw direct-fired hot air furnace from the loose crop straw disassembled from the round bale straw debaler was disorderly, the straw layer density was inconsistent, the feeding was uneven, and the stability of the hot air temperature and thermal energy output by the combustion furnace still needed to be improved to achieve better drying effect. Summary of the Invention

[0003] The purpose of the present invention is to address the problems existing in the above-mentioned prior art, combine with the actual needs of the round bale straw unbundling and direct combustion operation, and research and design a new structure of round bale straw unbundling direct combustion hot air heat exchange device, so as to greatly improve the balanced stability of the hot air temperature and thermal energy output by the straw direct combustion hot air furnace, provide high-quality drying heat energy for grain drying equipment, and ensure the drying quality.

[0004] The purpose of the present invention is achieved as follows: the round bale straw unbundling direct-fired hot air heat exchange device includes a straw direct-fired hot air furnace, which is connected in series with an air-to-air heat exchanger, a cyclone dust collector, a smoke exhaust fan, and a cyclone water film dust collector at the rear of the straw direct-fired hot air furnace through a smoke exhaust port. A round bale straw unbundling machine is arranged on the outside of the fuel feeding port at the front of the straw direct-fired hot air furnace, and a straw orderly feeding conveyor is installed between the discharge end of the round bale straw unbundling machine and the fuel feeding port of the straw direct-fired hot air furnace in a configuration that is interconnected and coordinated. The structure of the straw orderly feeding conveyor is as follows: side plates are fixed symmetrically on the front and rear sides of the frame, a speed regulating motor and a rotatable intermediate sprocket are fixed on the top ends of the two side plates, and a driving shaft A, a tensioning support shaft A, a driving shaft B and a tensioning support shaft B are respectively installed in parallel and rotatably between the two relatively fixed side plates. The driving shaft B and the tensioning support shaft B are respectively located at the lower parts of the driving shaft A and the tensioning support shaft A, and the axis center line of the driving shaft A is aligned with the tensioning support shaft A. The axis center lines of the support shaft A are located on the same horizontal plane and have the same shaft diameter size. The height position of the axis center line of the tensioning support shaft B is lower than the height position of the axis center line of the drive shaft B. The driving shaft A is fixed with a driving sprocket A and three driving sprockets A in sequence, and the tensioning support shaft A is fixed with three driven sprockets A in sequence. The three upper ring chains are respectively mounted on the corresponding driving sprockets A and driven sprockets A in parallel with each other, and multiple metal tooth plates A are respectively fixed with staggered intervals on the upper ring chain in the middle part and the two On the upper ring chain at the side; the driving sprocket B and three driving sprockets B are fixed on the driving shaft B in sequence, and three follower sprockets B are fixed on the tensioning support shaft B in sequence. The three lower ring chains are respectively mounted on the corresponding driving sprockets B and follower sprockets B in parallel with each other, and multiple metal tooth plates B are respectively fixed on the lower ring chain in the middle and the lower ring chains on both sides at staggered intervals; the rotation direction of the upper ring chain is opposite to that of the lower ring chain, and the upper ring chain in the horizontal position The downward angle α between the ring chain and the lower ring chain in the inclined position is 17°-21°, and the upper and lower spacing H between the lower end surface of the metal tooth plate A on the upper ring chain at the lower side of the drive sprocket A and the upper end surface of the metal tooth plate B on the lower ring chain at the upper side of the drive sprocket B is one-third of the thickness of the feeding straw layer; the driving main sprocket is fixed on the speed regulating motor, and the transmission chain is sequentially mounted on the driving main sprocket, the intermediate sprocket and the driving sprocket B, and is in overlapping contact with the driving sprocket A.

[0005] The present invention creates a straw orderly feeding conveyor independently developed and designed by the patent applicant, which is arranged between the discharge end of the round bale straw unpacking machine and the fuel feeding inlet of the straw direct-fired hot air furnace. This realizes the compression operation of the loose straw after the round bale straw is unpacked before being fed into the straw direct-fired hot air furnace. After the strip-shaped straw is formed, it is fed into the straw direct-fired hot air furnace in an orderly manner, and the conveying and feeding speed is adjustable. The straw direct-fired hot air furnace has the characteristics of uniform and stable output heat load, strong adaptability, reliable operation, high thermal efficiency and low operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of the overall structure of a direct-fired hot air heat exchange device for debaling round straw bales.

[0007] Description of part numbers in the figure:

[0008] 1. Round bale straw unpacking machine, 2. Straw orderly feeding conveyor, 3. Straw direct-fired hot air furnace, 4. Air-to-air heat exchanger, 5. Cyclone dust collector, 6. Smoke exhaust fan, 7. Cyclone water film dust collector.

[0009] Figure 2 This is a schematic diagram of the overall structure of the straw orderly feeding conveyor;

[0010] Figure 3 yes Figure 2 A top view of

[0011] Figure 4 yes Figure 2 AA partial cross-sectional view.

[0012] Part numbers in the figure: 2-1, frame, 2-2, lower ring chain, 2-3, metal tooth plate B, 2-4, tensioning support shaft B, 2-5, follower sprocket B, 2-6, straw hopper, 2-7, follower sprocket A, 2-8, tensioning support shaft A, 2-9, side plate, 2-10, metal tooth plate A, 2-11, upper ring chain, 2-12, speed control motor, 2-13, driving main sprocket, 2-14, intermediate sprocket, 2-15, driving shaft A, 2-16, driving sprocket A, 2-17, driving sprocket A, 2-18, transmission chain, 2-19, driving sprocket B, 2-20, driving shaft B, 2-21, driving sprocket B, 2-22, bottom plate. DETAILED DESCRIPTION

[0013] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. A round-bale straw unbundling direct-fired hot air heat exchange device includes a straw direct-fired hot air furnace 3, which is serially connected to an air-to-air heat exchanger 4, a cyclone dust collector 5, a smoke exhaust fan 6, and a cyclone-type water film dust collector 7 at the rear of the straw direct-fired hot air furnace 3 through a smoke exhaust port. A round-bale straw unbundling machine 1 is provided outside the fuel feed port at the front of the straw direct-fired hot air furnace 3, and a straw orderly feeding conveyor 2 is installed between the discharge end of the round-bale straw unbundling machine 1 and the fuel feed port of the straw direct-fired hot air furnace 3 in a configuration that is interconnected and coordinated.The structure of the straw orderly feeding conveyor 2 is as follows: side plates 2-9 are fixed symmetrically on the front and rear sides of the frame 2-1, a speed regulating motor 2-12 and an intermediate sprocket 2-14 are fixed on the top ends of the two side plates 2-9, and a driving shaft A2-15, a tensioning support shaft A2-8, a driving shaft B2-20 and a tensioning support shaft B2-4 are respectively installed in parallel and rotatably between the two relatively fixed side plates 2-9. The driving shaft B2-20 and the tensioning support shaft B2-4 are respectively located below the driving shaft A2-15 and the tensioning support shaft A2-8. The axis of the driving shaft A2-15 is parallel to the tensioning support shaft A2-8. The axis center lines of the tightening support shaft A2-8 are located on the same horizontal plane and have the same shaft diameter size. The height position of the axis center line of the tensioning support shaft B2-4 is lower than the height position of the axis center line of the driving shaft B2-20; the driving shaft A2-15 is fixed with a driving sprocket A2-17 and three driving sprockets A2-16 in sequence, and the tensioning support shaft A2-8 is fixed with three follower sprockets A2-7 in sequence. The three upper ring chains 2-11 are parallel to each other and respectively mounted on the corresponding driving sprockets A2-16 and follower sprockets A2-7. A plurality of metal tooth plates A2-10 are fixed with staggered intervals on the upper ring chain 2-11 in the middle part and on both sides. On the upper annular chain 2-11; the driving sprocket B2-19 and three driving sprockets B2-21 are fixed in sequence on the driving shaft B2-20, and the three follower sprockets B2-5 are fixed in sequence on the tensioning support shaft B2-4. The three lower annular chains 2-2 are respectively mounted on the corresponding driving sprockets B2-21 and follower sprockets B2-5 in parallel with each other, and a plurality of metal tooth plates B2-3 are respectively fixed on the lower annular chain 2-2 in the middle part and the lower annular chains 2-2 on both sides at staggered intervals; the rotation direction of the upper annular chain 2-11 is opposite to that of the lower annular chain 2-2, and the upper annular chain 2-2 in the horizontal position -11 and the inclined lower ring chain 2-2 have a downward angle α of 17°-21°. The vertical spacing H between the lower end surface of the metal tooth plate A2-10 on the upper ring chain 2-11 at the lower side of the drive sprocket A2-16 and the upper end surface of the metal tooth plate B2-3 on the lower ring chain 2-2 at the upper side of the drive sprocket B2-21 is one-third of the thickness of the feeding straw layer. The driving main sprocket 2-13 is fixed to the speed regulating motor 2-12. The transmission chain 2-18 is sequentially mounted on the driving main sprocket 2-13, the intermediate sprocket 2-14 and the driving sprocket B2-19, and is in overlapping contact with the driving sprocket A2-17. A straw hopper 2-6 is installed on the feeding end of the two side plates 2-9, located at the left end of the lower ring chain 2-2. A bottom plate 2-22 is installed on the bottom ends of the two side plates 2-9 and below the lower ring chain 2-2.

[0014] During operation, the straw in the round straw bale is loosened layer by layer from the outside to the inside by the round straw unpacking machine 1, and then transported to the straw orderly feeding conveyor 2. Driven by the upper ring chain 2-11 and the lower ring chain 2-2, which are configured in a cone shape and rotate in opposite directions, the metal tooth plate A2-10 and the metal tooth plate B2-3 cooperate with each other to compress the loose straw in the process of orderly transporting it backward to form a strip-shaped straw layer with a density suitable for direct combustion. The strip-shaped straw then continuously and evenly enters the straw direct-fired hot air furnace 3 to complete full combustion. The high-temperature flue gas generated by the combustion exchanges heat with the air through the gas-to-gas heat exchanger 4 to provide a gas drying medium of a certain temperature for the grain drying equipment. The low-temperature waste flue gas is then removed from the smoke particulate matter and desulfurized and denitrified by the cyclone dust collector 5, the smoke exhaust fan 6 and the cyclone water film dust collector 7, and is discharged into the atmosphere after meeting environmental protection requirements.

[0015] Drive chain 2-18 is mounted on main drive sprocket 2-13, intermediate sprocket 2-14, and driving sprocket B2-19, and is in overlapped engagement with driving sprocket A2-17, enabling upper ring chain 2-11 and lower ring chain 2-2 to rotate in opposite directions. Speed regulating motor 2-12 allows for stepless adjustment of the rotational speeds of upper and lower ring chains 2-11 and 2-2, enhancing operational adaptability.

Claims

1. A round straw bale unbundling direct-fired hot air heat exchange device, comprising a straw direct-fired hot air furnace (3), wherein the rear portion of the straw direct-fired hot air furnace (3) is connected in series with an air-to-air heat exchanger (4), a cyclone dust collector (5), a smoke exhaust fan (6), and a cyclone-type water film dust collector (7), and a round straw unbundling machine (1) is arranged outside a fuel feed port at the front portion of the straw direct-fired hot air furnace (3). The device is characterized in that: A straw orderly feeding conveyor (2) is installed in a configuration that is mutually connected and coordinated between the discharge end of the round straw unpacking machine (1) and the fuel feeding port of the straw direct-fired hot air furnace (3); the structure of the straw orderly feeding conveyor (2) is as follows: side plates (2-9) are fixedly installed symmetrically on the front and rear sides of the frame (2-1); a speed regulating motor (2-12) and an intermediate sprocket (2-14) are fixedly installed on the top ends of the two side plates (2-9); a driving shaft A (2-15), a tensioning support shaft A (2-8), a driving shaft B (2-20) and a tensioning support shaft B (2-4) are respectively installed in parallel and rotatably between the two relatively fixed side plates (2-9); The driving shaft B (2-20) and the tensioning support shaft B (2-4) are respectively located below the driving shaft A (2-15) and the tensioning support shaft A (2-8). The axis centerline of the driving shaft A (2-15) and the axis centerline of the tensioning support shaft A (2-8) are located on the same horizontal plane and have the same shaft diameter. The height position of the axis centerline of the tensioning support shaft B (2-4) is lower than the height position of the axis centerline of the driving shaft B (2-20). A driving sprocket A (2-17) and three driving sprockets A (2-16) are fixed on the driving shaft A (2-15) in sequence, and three driven sprockets A (2-7) are fixed on the tensioning support shaft A (2-8) in sequence. The three upper ring chains (2-11) are parallel to each other. The plurality of metal tooth plates A (2-10) are fixedly mounted on the upper ring chain (2-11) at the middle part and the upper ring chains (2-11) at the two side parts in a staggered manner; the driving sprocket B (2-19) and three driving sprockets B (2-21) are fixedly mounted on the driving shaft B (2-20) in sequence, and three following sprockets B (2-5) are fixedly mounted on the tensioning support shaft B (2-4) in sequence. The three lower ring chains (2-2) are respectively mounted on the corresponding driving sprockets B (2-21) and following sprockets B (2-5) in parallel with each other, and the plurality of metal tooth plates B (2-3) are fixedly mounted on the upper ring chain (2-11) at the middle part and the upper ring chains (2-11) at the two side parts in a staggered manner; the driving sprocket B (2-19) and three driving sprockets B (2-21) are fixedly mounted on the driving shaft B (2-20) in sequence, and the three following sprockets B (2-5) are fixedly mounted on the tensioning support shaft B (2-4) in sequence. The staggered intervals are fixed on the lower ring chain (2-2) at the middle position and the lower ring chains (2-2) at the two side positions respectively; the rotation direction of the upper ring chain (2-11) is opposite to the rotation direction of the lower ring chain (2-2); the downward angle α between the upper ring chain (2-11) in the horizontal position and the lower ring chain (2-2) in the inclined position is 17°-21°; the upper and lower spacing dimension H between the lower end surface of the metal tooth plate A (2-10) on the upper ring chain (2-11) at the lower side of the driving sprocket A (2-16) and the upper end surface of the metal tooth plate B (2-3) on the lower ring chain (2-2) at the upper side of the driving sprocket B (2-21) is one third of the thickness of the feeding straw layer;A driving main sprocket (2-13) is fixedly mounted on the speed regulating motor (2-12), and a transmission chain (2-18) is sequentially mounted on the driving main sprocket (2-13), the intermediate sprocket (2-14), and the driving sprocket B (2-19), and is in overlapping contact with the driving sprocket A (2-17).

2. The round straw bale unbundling direct-fired hot air heat exchange device according to claim 1, characterized in that: A straw hopper (2-6) is installed on the feeding ends of the two side plates (2-9) and at the left end of the lower ring chain (2-2).

3. The direct-fired hot air heat exchange device for unbundling round straw bales according to claim 1 or 2, characterized in that: A bottom plate (2-22) is installed on the bottom ends of the two side plates (2-9) and at a position below the lower ring chain (2-2).

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