A rotary rice husk carbonization furnace

Abstract

The present invention provides a rotary rice husk carbonization furnace, comprising a furnace box, an outer furnace barrel, an inner furnace barrel, a first conduit and a second conduit. The outer furnace barrel and the inner furnace barrel are both cylindrical in shape with one end open. The closed end of the inner furnace barrel is fixedly connected to one end of a tube, and the other end of the tube passes through the closed end of the outer furnace barrel. The first conduit is fixedly connected to the inner wall surface of the inner furnace barrel. A plurality of annular racks are arranged between the outer peripheral surface of the inner furnace barrel and the inner wall surface of the outer furnace barrel. The second conduit connects all the annular racks in series. The surfaces of the first conduit and the second conduit are both provided with a plurality of gas collection holes, and the first conduit and the second conduit are both arranged in a spiral shape. On the one hand, the first conduit and the second conduit both fully stir the material to avoid local accumulation of the material, so that the material is evenly carbonized; on the other hand, the first conduit and the second conduit also collect the cracking gas generated during the carbonization process of the material, and discharge it out of the carbonization furnace in time, thereby ensuring the safe and stable operation of the carbonization equipment.

Description

Technical Field

[0001] The invention relates to the technical field of carbonization equipment, in particular to a rotary rice husk carbonization furnace. Background Art

[0002] In recent years, the fertilizer utilization of biomass such as rice husks has attracted attention from all parties. Among them, the biochar formed by carbonizing rice husks is used in the production of compound fertilizers, which has significant effects on soil improvement and crop yield increase. In addition, the carbonization of rice husks to form biochar can also help reduce the emission of greenhouse gases such as carbon dioxide, and has a good promoting effect on the development of low-carbon agriculture and soil carbon sequestration.

[0003] For example, a patent application with publication number: "CN213202919U" discloses a carbonization equipment for producing biomass particles, including a base plate, a transport box is fixedly connected to the upper surface of the base plate, a servo motor is fixedly connected to the inner bottom wall of the transport box, a spiral transport rod is fixedly connected to the output end of the servo motor, a carbonization box is fixedly connected to the top of the transport box, a stirring motor is fixedly connected to one side of the carbonization box, a stirring motor is fixedly connected to the output end of the stirring motor, and a stirring rod is fixedly connected to the surface of the stirring rod. This patented technology further evenly crushes and carbonizes the biomass particles by setting crushing rollers and sieve plates. However, since the stirring device can only stir the local area in the carbonization box in the same direction, the material can only roll in the same direction along the output shaft of the stirring motor, so that the material is almost not stirred in the axial direction, resulting in poor stirring effect and poor carbonization uniformity of the material. If the material is not evenly stirred in the carbonization furnace and the material is locally accumulated, it will make the cracking gas generated by the rice husk in the carbonization process difficult to discharge, resulting in gas compression. In addition, the cracking gas generated in the rice husk carbonization process often has a high temperature. If it is not discharged in time, it will also cause huge pressure on the carbonization furnace, affecting the safe and stable operation of the carbonization furnace. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a rotary rice husk carbonization furnace.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a rotary rice husk carbonization furnace, comprising a furnace box, an outer furnace drum, an inner furnace drum, a first conduit and a second conduit, the outer furnace drum and the inner furnace drum are both cylindrical in shape with one end open, the closed end of the inner furnace drum is fixedly connected to one end of a tube, the other end of the tube passes through the closed end of the outer furnace drum, and the front and rear ends of the outer furnace drum, the open end of the inner furnace drum, and one end of the tube are all supported in the furnace box by a supporting device, the closed end of the inner furnace drum is also provided with a plurality of material passing holes, the first conduit is fixedly connected to the inner wall surface of the inner furnace drum, a plurality of annular shifting racks are provided between the outer circumferential surface of the inner furnace drum and the inner wall surface of the outer furnace drum, the second conduit connects all the annular shifting racks in series, the surfaces of the first conduit and the second conduit are both provided with a plurality of gas collection holes, and the first conduit and the second conduit are both arranged in a spiral shape.

[0007] The support device comprises a support seat, on which a support wheel is arranged, and the outer peripheral surface of the outer furnace drum, the outer peripheral surface of the inner furnace drum and the outer peripheral surface of the tube are respectively circumscribed with the outer peripheral surface of the support wheel.

[0008] The rotary rice husk carbonization furnace also includes a feeding barrel, which is supported at the open end of the inner furnace barrel by a rolling bearing, and a screw conveyor is installed in the feeding barrel.

[0009] A heating pipe and a return air pipe are arranged on the surface of the furnace box, and a heat pump unit is connected between the heating pipe and the return air pipe.

[0010] A motor is also installed on the surface of the furnace box, and the output shaft of the motor is respectively fixedly connected to the first main gear and the second main gear, the outer surface of the outer furnace drum is also fixedly connected to the first slave gear, and the outer surface of the inner furnace drum is also fixedly connected to the second slave gear, the first main gear and the first slave gear are meshed with each other, the second main gear and the second slave gear are meshed with each other, and the spiral rotation directions of the first conduit and the second conduit are opposite.

[0011] A plurality of universal balls are installed on the surface of the shifting frame, and grooves are arranged on the outer peripheral surface of the inner furnace tube and the inner wall surface of the outer furnace tube, and the universal balls are sleeved in the grooves.

[0012] The length direction of the channel is consistent with the axial direction of the inner furnace drum or the outer furnace drum.

[0013] The inner wall surface of the outer furnace drum and at least one of the annular racks are connected together via a spring.

[0014] The end of the first conduit is also connected to the tube, and the end of the tube extends out of the outer furnace barrel. The open end of the outer furnace barrel is also provided with a tube cover, and the surface of the tube cover is provided with an exhaust hole. The end of the second conduit is connected to the exhaust hole.

[0015] The first conduit or the second conduit may be replaced by a stainless steel bellows.

[0016] The beneficial effects of the present invention are as follows: by adopting the technical scheme of the present invention, the crushed rice husk material is first fed into the inner furnace drum, and then enters the outer furnace drum through the feeding hole on the closed end of the inner furnace drum, and carbonization is performed in both the inner furnace drum and the outer furnace drum. On the one hand, the carbonization process of the material is prolonged, and the carbonization quality is improved; on the other hand, the first conduit and the second conduit both fully stir the material, so that the material is continuously rolled in the inner furnace drum and the outer furnace drum, and the material is also continuously displaced and moved along the axial direction of the inner furnace drum or the outer furnace drum with the annular shifting rack, so that local accumulation of the material is avoided, the material is fully stirred, and uniform carbonization is achieved; in addition, the first conduit and the second conduit also collect the cracking gas generated in the carbonization process of the material, and discharge it out of the carbonization furnace in time, so as to ensure the safe and stable operation of the carbonization equipment and avoid the compressed gas phenomenon in the carbonization furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention;

[0018] Figure 2 The present invention is along the Figure 1 Sectional view cut along the AA plane;

[0019] Figure 3 The present invention is along the Figure 1 Sectional view of the BB plane;

[0020] Figure 4 The present invention is along the Figure 1 Sectional view of the CC plane;

[0021] Figure 5 It is the front view of the tube cover of the present invention.

[0022] In the figure: 1-furnace box, 2-outer furnace drum, 3-inner furnace drum, 4-first conduit, 5-second conduit, 6-trustee, 7-support device, 8-annular rack, 9-support seat, 10-support wheel, 11-feeding barrel, 12-screw conveyor, 13-heating pipe, 14-return air pipe, 15-heat pump unit, 16-motor, 17-first main gear, 18-second main gear, 19-first slave gear, 20-second slave gear, 21-universal ball, 22-spring, 23-barrel cover, 24-leakage hole, 25-feeding hole, 26-exhaust hole, 27-discharge door. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] like Figures 1 to 5As shown, the present invention provides a rotary rice husk carbonization furnace, comprising a furnace box 1, an outer furnace drum 2, an inner furnace drum 3, a first conduit 4 and a second conduit 5. The outer furnace drum 2 and the inner furnace drum 3 are both cylindrical in shape with one end open, the closed end of the inner furnace drum 3 is fixedly connected to one end of the tube 6, the other end of the tube 6 passes through the closed end of the outer furnace drum 2, and the front and rear ends of the outer furnace drum 2, the open end of the inner furnace drum 3, and one end of the tube 6 are all supported in the furnace box 1 by a supporting device 7, the closed end of the inner furnace drum 3 is also provided with a plurality of feeding holes 25, the first conduit 4 is fixedly connected to the inner wall surface of the inner furnace drum 3, a plurality of annular shifting racks 8 are provided between the outer circumferential surface of the inner furnace drum 3 and the inner wall surface of the outer furnace drum 2, the second conduit 5 connects all the annular shifting racks 8 in series, the surfaces of the first conduit 4 and the second conduit 5 are provided with a plurality of gas collection holes, and the first conduit 4 and the second conduit 5 are both arranged in a spiral shape.

[0025] By adopting the technical scheme of the present invention, the crushed rice husk material is first fed into the inner furnace drum, and then enters the outer furnace drum through the feeding hole on the closed end of the inner furnace drum, and carbonization is carried out in both the inner furnace drum and the outer furnace drum. On the one hand, the carbonization process of the material is prolonged and the carbonization quality is improved; on the other hand, the first conduit and the second conduit both fully stir the material, so that the material is constantly rolling in the inner furnace drum and the outer furnace drum, and the material is also constantly displaced and moved along the axial direction of the inner furnace drum or the outer furnace drum with the annular shifting rack, so as to avoid local accumulation of the material, so that the material is fully stirred and uniformly carbonized; in addition, the first conduit and the second conduit also collect the cracking gas generated during the carbonization process of the material, and discharge it out of the carbonization furnace in time, so as to ensure the safe and stable operation of the carbonization equipment and avoid the generation of compressed gas in the carbonization furnace. Finally, the biochar generated by the carbonization of the rice husk is collected and taken out through the discharge door 27.

[0026] Specifically, the support device 7 includes a support seat 9, on which a support wheel 10 is provided, and the outer peripheral surface of the outer furnace drum 2, the outer peripheral surface of the inner furnace drum 3, and the outer peripheral surface of the tube 6 are respectively circumscribed with the outer peripheral surface of the support wheel 10. The support wheel 10 can be replaced by a rolling bearing, and the support seat 9 is U-shaped as a whole. In addition, the rotary rice husk carbonization furnace also includes a feed barrel 11, which is supported at the open end of the inner furnace drum 3 by a rolling bearing, and a screw conveyor 12 is installed in the feed barrel 11.

[0027] In addition, a heating pipe 13 and a return air pipe 14 are provided on the surface of the furnace box 1, and a heat pump unit 15 is connected between the heating pipe 13 and the return air pipe 14. The heat pump unit 15 sends the airflow carrying heat energy into the furnace box, so that the rice husk materials in the inner furnace tube and the outer furnace tube are indirectly heated and carbonized, and the airflow after heat exchange is recovered through the return air pipe 14 and reused, realizing the recycling of heat energy.

[0028] Specifically, a motor 16 is also installed on the surface of the furnace box 1, and the output shaft of the motor 16 is respectively connected to the first main gear 17 and the second main gear 18, the outer surface of the outer furnace drum 2 is also connected to the first slave gear 19, and the outer surface of the inner furnace drum 3 is also connected to the second slave gear 20, the first main gear 17 and the first slave gear 19 are meshed with each other, the second main gear 18 and the second slave gear 20 are meshed with each other, and the spiral rotation directions of the first conduit 4 and the second conduit 5 are opposite. Driven by the motor, the inner furnace drum and the outer furnace drum rotate in the same direction, however, since the spiral rotation directions of the first conduit 4 and the second conduit 5 are opposite, the material is fed in the inner furnace drum and the outer furnace drum in the opposite axial direction, so that the rice husk material not only rotates and rolls around the axial direction of the inner furnace drum or the outer furnace drum, but also continuously exchanges heat along the axial direction of the inner furnace drum or the outer furnace drum, thereby ensuring the uniformity of the carbonization of the material.

[0029] In addition, a plurality of universal balls 21 are installed on the surface of the rack 8, and grooves are provided on the outer peripheral surface of the inner furnace drum 3 and the inner wall surface of the outer furnace drum 2, and the universal balls 21 are fitted in the grooves, and the length direction of the grooves is preferably consistent with the axial direction of the inner furnace drum 3 or the outer furnace drum 2, and the universal balls 21 are preferably stainless steel universal balls with screws, which are easy to install, and the inner wall surface of the outer furnace drum 2 and at least one annular rack 8 are also connected together by springs 22. The rice husk material can be continuously exchanged and heat-exchanged in the outer furnace drum along the axial direction of the outer furnace drum with the annular rack, further improving the uniformity of carbonization of the material.

[0030] Furthermore, the end of the first conduit 4 is also connected to the tube 6, and the end of the tube 6 is also extended out of the outer furnace tube 2. The open end of the outer furnace tube 2 is also provided with a tube cover 23, and the surface of the tube cover 23 is provided with an exhaust hole 26. The end of the second conduit 5 is connected to the exhaust hole 26. Preferably, the first conduit 4 or the second conduit 5 can be replaced by a stainless steel bellows. Thus, the cracking gas generated by the rice husk during the carbonization process is collected in time through the first conduit and the second conduit and finally discharged out of the carbonization equipment through the tube and the exhaust hole 26. On the one hand, the safe and stable operation of the carbonization equipment is guaranteed, and the material is prevented from generating compressed gas in the carbonization furnace; on the other hand, the cracking gas is a combustible gas, and the user can collect the cracking gas at the end of the tube and the exhaust hole and make effective use of it.

Claims

1. A rotary rice husk carbonization furnace, characterized in that: The invention comprises a furnace box (1), an outer furnace tube (2), an inner furnace tube (3), a first guide tube (4) and a second guide tube (5), wherein the outer furnace tube (2) and the inner furnace tube (3) are both cylindrical in shape with one end open, the closed end of the inner furnace tube (3) is fixedly connected to one end of a tube holder (6), the other end of the tube holder (6) passes through the closed end of the outer furnace tube (2), and the front and rear ends of the outer furnace tube (2), the open end of the inner furnace tube (3) and one end of the tube holder (6) are all supported in the furnace box (1) by a supporting device (7). The closed end of the inner furnace drum (3) is also provided with a plurality of material passing holes (25); the first conduit (4) is fixedly connected to the inner wall surface of the inner furnace drum (3); a plurality of annular shifting frames (8) are provided between the outer peripheral surface of the inner furnace drum (3) and the inner wall surface of the outer furnace drum (2); the second conduit (5) connects all the annular shifting frames (8) in series; the surfaces of the first conduit (4) and the second conduit (5) are both provided with a plurality of gas collection holes, and the first conduit (4) and the second conduit (5) are both arranged in a spiral shape; A heat supply pipe (13) and a return air pipe (14) are provided on the surface of the furnace box (1), and a heat pump unit (15) is connected between the heat supply pipe (13) and the return air pipe (14). A motor (16) is also installed on the surface of the furnace box (1), and the output shaft of the motor (16) is respectively connected to the first main gear (17) and the second main gear (18). The outer surface of the outer furnace drum (2) is also connected to the first slave gear (19), and the outer surface of the inner furnace drum (3) is also connected to the second slave gear (20). The first main gear (17) and the first slave gear (19) are meshed with each other, and the second main gear (18) and the second slave gear (20) are meshed with each other. The first conduit (4) and the second conduit (5) are meshed, and the spiral directions of the first conduit (4) and the second conduit (5) are opposite, the end of the first conduit (4) is also connected to the tube (6), the end of the tube (6) is also extended out of the outer furnace barrel (2), the open end of the outer furnace barrel (2) is also provided with a tube cover (23), the surface of the tube cover (23) is provided with an exhaust hole (26), and the end of the second conduit (5) is connected to the exhaust hole (26), so that the cracking gas generated by the rice husk during the carbonization process is collected in time through the first conduit (4) and the second conduit (5) and finally discharged out of the carbonization furnace through the tube (6) and the exhaust hole (26); A plurality of universal balls (21) are mounted on the surface of the annular shifting frame (8); the outer peripheral surface of the inner furnace drum (3) and the inner wall surface of the outer furnace drum (2) are both provided with grooves, in which the universal balls (21) are sleeved; the length direction of the grooves is consistent with the axial direction of the inner furnace drum (3) or the outer furnace drum (2); the inner wall surface of the outer furnace drum (2) and at least one of the annular shifting frames (8) are also connected together via a spring (22).

2. The rotary rice husk carbonization furnace according to claim 1, characterized in that: The support device (7) comprises a support seat (9), on which a support wheel (10) is provided, and the outer peripheral surface of the outer furnace drum (2), the outer peripheral surface of the inner furnace drum (3), and the outer peripheral surface of the tube (6) are respectively circumscribed with the outer peripheral surface of the support wheel (10).

3. The rotary rice husk carbonization furnace according to claim 1, characterized in that: The rotary rice husk carbonization furnace also includes a feeding barrel (11), the feeding barrel (11) is supported at the open end of the inner furnace barrel (3) by a rolling bearing, and a screw conveyor (12) is installed in the feeding barrel (11).

4. The rotary rice husk carbonization furnace according to claim 1, characterized in that: The first conduit (4) or the second conduit (5) is replaced by a stainless steel bellows.

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