A system for producing wood vinegar from agricultural straw

Abstract

The invention relates to a system for producing wood vinegar from agricultural straw. The system comprises a screw loader, a pyrolysis kiln, a sedimentation separation tower and a wood vinegar recovery unit, which are connected in sequence. The discharge port of the screw loader is connected to the material inlet of the pyrolysis kiln. A combustion gas pipeline, a liquefied gas pipeline, a straw gas pipeline and a plurality of evenly distributed burners are provided on the side of the pyrolysis kiln. Each burner is connected to the combustion gas pipeline and the straw gas pipeline via a pipeline, and the straw gas pipeline is connected to the liquefied gas pipeline via a pipeline. The top of the sedimentation separation tower is provided with a first exhaust port, and the bottom is provided with a discharge port for discharging biomass charcoal generated by the pyrolysis kiln. The first exhaust port is connected to the wood vinegar recovery unit and is used to input the biomass gas after gas-solid separation into the wood vinegar recovery unit. The wood vinegar recovery unit comprises a cooling pipe and a spray pipe connected in series in sequence. A high boiling point component recovery tank and a wood vinegar recovery tank are respectively provided at the bottom of the cooling pipe and the spray pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of wood vinegar production, and particularly relates to a system for producing wood vinegar from agricultural straw. Background Art

[0002] A large amount of straw contains rich organic matter and is a high-quality source of organic fertilizer. Currently, agricultural straw can be pyrolyzed to produce biomass carbon, combustible gas and wood vinegar, which can be directly used.

[0003] However, wood vinegar cannot be obtained directly from the pyrolysis of agricultural straw. It must be separated and recovered from the gas produced by the pyrolysis. As a result, the obtained wood vinegar contains more impurities, is of poor quality, and has unstable content of various components, which affects the subsequent development and utilization of wood vinegar. Summary of the Invention

[0004] To address the above problems, the present invention provides a system for producing wood vinegar from agricultural straw, comprising a screw feeder, a pyrolysis kiln, a sedimentation separation tower, and a wood vinegar recovery unit connected in sequence. The discharge port of the screw feeder is connected to the material inlet of the pyrolysis kiln for feeding the crushed straw into the pyrolysis kiln for pyrolysis.

[0005] The side of the pyrolysis kiln is provided with a combustion-supporting gas pipeline, a liquefied gas pipeline, a straw gas pipeline and a number of evenly distributed burners. Each burner is connected to the combustion-supporting gas pipeline and the straw gas pipeline through a pipeline. The straw gas pipeline is connected to the liquefied gas pipeline through a pipeline. The combustion-supporting gas, liquefied gas and straw gas are input into the burner for ignition to provide heat for the pyrolysis kiln.

[0006] The top of the sedimentation separation tower is provided with a first exhaust port, and the bottom is provided with a discharge port for discharging the biomass charcoal generated by the pyrolysis kiln; the first exhaust port is connected to the wood vinegar recovery unit, and is used to input the biomass gas after gas-solid separation into the wood vinegar recovery unit;

[0007] The wood vinegar recovery unit comprises a cooling pipe and a spray pipe connected in series, and a high boiling point component recovery tank and a wood vinegar recovery tank are respectively provided at the bottom of the cooling pipe and the spray pipe.

[0008] Optionally, the spiral feeder includes a feed hopper, an inclined spiral feed tube, a feed screw motor and a lock fan; the height of the inlet of the spiral feed tube is lower than the height of the outlet of the spiral feed tube, and a feed screw motor is provided on the upper part or top side of the spiral feed tube, which is used to connect and drive the spiral feed rod in the spiral feed tube to rotate.

[0009] Optionally, the pyrolysis kiln includes an inclined furnace body and a combustion-supporting gas pipeline, a liquefied gas pipeline, a straw gas pipeline, and a plurality of burners located on the same side of the furnace body. The furnace body is horizontally tubular, and the height of the material inlet of the pyrolysis kiln is greater than the height of its material outlet, so that the biomass gas and biomass char obtained by pyrolysis of the straw in the furnace body are discharged into the sedimentation separation tower along the inclined furnace body.

[0010] The combustion-supporting gas pipeline, the liquefied gas pipeline and the straw gas pipeline are all parallel to the furnace body; and a plurality of burners are evenly arranged at the lower part of the furnace body along the length direction of the furnace body.

[0011] Optionally, the sedimentation separation tower includes a discharge hopper, a connecting portion and a separation portion from bottom to top, and the material outlet of the pyrolysis kiln is connected to the docking port on the side of the connecting portion, so that the biomass gas and biomass char obtained by pyrolysis in the furnace body are discharged into the sedimentation separation tower;

[0012] The separation part includes an inclined plate separation area and a spiral separation area from bottom to top. A plurality of pairs of separation plate groups are arranged inside the inclined plate separation area. Each pair of separation plate groups includes two inclined plates that are inclined to each other and form an "eight" shape.

[0013] The spiral separation zone includes at least one spirally coiled tube, the top outlet of the spirally coiled tube is the first exhaust port, and the bottom opening of the discharge hopper is the discharge port.

[0014] Further optionally, the inclined plate separation zone is provided with a plurality of layers of separation plate groups, each layer is provided with a plurality of pairs of separation plate groups, and the separation plate groups are evenly arranged in the inclined plate separation zone;

[0015] A conical cover plate is provided on the top of the inclined plate separation zone, and a through hole is provided in the center of the conical cover plate. The through hole communicates with the inclined plate separation zone and the spiral separation zone.

[0016] Further optionally, the spiral separation zone has a cylindrical shape, and a spirally coiled tube is provided in the inner cavity of the spiral separation zone. The bottom opening of the spirally coiled tube is connected to the through hole of the conical cover plate, and the rising airflow in the inclined plate separation zone is introduced into the spirally coiled tube. The spirally coiled tube is coiled several times for further gas-solid separation.

[0017] Further optionally, a straw gas preheating inlet is provided at the top of the spiral separation zone, which is connected to the inner cavity of the spiral separation zone; a heat exchange interlayer is provided on the outer side of the inclined plate separation zone, which is connected to the inner cavity of the spiral separation zone, and a straw gas preheating outlet is provided at the bottom of the heat exchange interlayer, which is connected to the inlet of the straw gas pipeline.

[0018] Optionally, the wood vinegar recovery unit includes a cooling pipe, a spray pipe and a post-processing pipe connected in series, wherein the cooling pipe is provided with a first air inlet at the top and a second air outlet at the bottom; the spray pipe is provided with a second air inlet at the bottom and a third air outlet at the top; the post-processing pipe is provided with a third air inlet at the bottom and a fourth air outlet at the top;

[0019] The first exhaust port is connected to the first air inlet, the second exhaust port is connected to the second air inlet, the third exhaust port is connected to the third air inlet, and the fourth exhaust port is connected to the straw gas preheating inlet;

[0020] The cooling pipe and the spray pipe are both arranged on the outside of the sedimentation separation tower, and the post-processing pipe is located above the sedimentation separation tower.

[0021] Further optionally, a high-boiling-point component recovery tank is provided at the bottom of the cooling tube, and the second exhaust port is located above the high-boiling-point component recovery tank; a cooling interlayer is provided on the outside of the cooling tube, and a water outlet and a water inlet are provided at the upper and lower parts of the cooling interlayer respectively, for introducing cooling water into the cooling interlayer to condense the high-boiling-point components in the cooling tube.

[0022] Further optionally, a wood vinegar recovery tank is provided at the bottom of the spray pipe, and the second air inlet is located above the wood vinegar recovery tank; a first spray water pipe is provided at the top of the spray pipe, and the third exhaust port is located below the first spray water pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic structural diagram of a system for producing wood vinegar from agricultural straw;

[0024] Figure 2 It is a schematic diagram of the combination of pyrolysis kiln and sedimentation separation tower;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 It is a structural diagram of the separation part;

[0027] Figure 5 It is a structural diagram of a wood vinegar recovery unit;

[0028] Figure 6 It is a schematic diagram of the combination of a sedimentation separation tower and a wood vinegar recovery unit.

[0029] In the accompanying drawings, 1-screw feeder, 2-pyrolysis kiln, 3-sedimentation separation tower, 4-wood vinegar recovery unit, 5-fuel gas pipeline, 6-liquefied gas pipeline, 7-straw gas pipeline, 8-burner, 9-first exhaust port, 10-cooling pipe, 11-spray pipe, 12-high boiling point component recovery tank, 13-wood vinegar recovery tank, 14-feed hopper, 15-screw feed pipe, 16-feed screw motor, 17-lock fan, 18-furnace body, 19-first branch pipe, 20 -Second branch pipe, 21-Third branch pipe, 22-Ignition transformer, 23-Exhaust gas outlet, 24-Discharge hopper, 25-Connecting part, 26-Inclined plate separation area, 27-Spiral separation area, 28-Inclined plate, 29-Spiral coiled tube, 30-Conical cover plate, 31-Inner cavity, 32-Straw gas preheating inlet, 33-Heat exchange interlayer, 34-Straw gas preheating outlet, 35-Cooling interlayer, 36-First spray water pipe, 37-Secondary spray pipe, 38-Second spray water pipe. DETAILED DESCRIPTION

[0030] This embodiment provides a system for producing wood vinegar from agricultural straw, such as Figures 1-6 As shown, it includes a screw feeder 1, a pyrolysis kiln 2, a sedimentation separation tower 3 and a wood vinegar recovery unit 4 connected in sequence, and the discharge port of the screw feeder 1 is connected to the material inlet of the pyrolysis kiln 2 for inputting the crushed straw into the pyrolysis kiln 2 for pyrolysis;

[0031] The side of the pyrolysis kiln 2 is provided with a combustion-supporting gas pipeline 5, a liquefied gas pipeline 6, a straw gas pipeline 7 and a number of evenly distributed burners 8. Each burner 8 is connected to the combustion-supporting gas pipeline 5 and the straw gas pipeline 7 through a pipeline. The straw gas pipeline 7 is connected to the liquefied gas pipeline 6 through a pipeline. The combustion-supporting gas, liquefied gas and straw gas are input into the burner 8 and ignited to provide heat for the pyrolysis kiln 2.

[0032] The top of the sedimentation separation tower 3 is provided with a first exhaust port 9, and the bottom is provided with a discharge port for discharging the biomass charcoal generated by the pyrolysis kiln 2; the first exhaust port 9 is connected to the wood vinegar recovery unit 4, and is used to input the biomass gas after gas-solid separation into the wood vinegar recovery unit 4;

[0033] The wood vinegar recovery unit 4 comprises a cooling pipe 10 and a spray pipe 11 connected in series, and a high boiling point component recovery tank 12 and a wood vinegar recovery tank 13 are provided at the bottom of the cooling pipe 10 and the spray pipe 11 respectively. Figure 1 The wood vinegar recovery unit is not shown.

[0034] Optionally, the spiral feeder 1 includes a feed hopper 14, an inclined spiral feed pipe 15, a feed spiral motor 16 and a lock fan 17; the top opening of the feed hopper 14 is used to pour the raw agricultural straw, and the bottom opening of the feed hopper 14 is connected to the inlet of the spiral feed pipe 15. The height of the inlet of the spiral feed pipe 15 is lower than the height of the outlet of the spiral feed pipe 15, so that the spiral feed pipe 15 is inclined, and a feed spiral motor 16 is provided on the side of the upper part or top of the spiral feed pipe 15, which is used to connect and drive the spiral feed rod in the spiral feed pipe 15 to rotate;

[0035] A lock fan 17 is provided above the outlet of the spiral feeding pipe 15 , and the outlet is connected to the material inlet of the pyrolysis kiln 2 .

[0036] Further optionally, a first bracket is provided below the screw loader 1 for supporting the screw loader 1 .

[0037] The various accessories of the feed hopper 14, spiral feed pipe 15, feed screw motor 16 and air lock fan 17 of the present invention can all adopt the corresponding components available on the market, and then be connected in the above manner. The feed of the feed hopper 14 is crushed agricultural straw. The straw that has become pellets moves forward and rises along the spiral feed pipe 15 under the drive of the spiral feed rod. The air lock fan 17 plays a role in dust removal and dust reduction. The outlet of the spiral feed pipe 15 inputs the conveyed material into the pyrolysis kiln 2. A nitrogen filling port is provided on the connecting pipe between the outlet of the spiral feed pipe 15 and the material inlet of the pyrolysis kiln 2, which is used to fill nitrogen and mix it with the material, which is beneficial to limit the amount of oxygen in the pyrolysis kiln 2 and realize oxygen-limited low-temperature pyrolysis.

[0038] Optionally, the pyrolysis kiln 2 includes an inclined furnace body 18 and a combustion-supporting gas pipeline 5, a liquefied gas pipeline 6, a straw gas pipeline 7, and a plurality of burners 8 located on the same side of the furnace body 18. The furnace body 18 is horizontal and tubular, and has a certain angle with the horizontal plane, for example, 20-40 degrees. The height of the material inlet of the pyrolysis kiln 2 is greater than the height of its material outlet, so that the biomass gas and biochar obtained by pyrolysis of the straw in the furnace body 18 are discharged into the sedimentation separation tower 3 along the inclined furnace body 18.

[0039] The combustion-supporting gas pipeline 5 , the liquefied gas pipeline 6 , and the straw gas pipeline 7 are all parallel to the furnace body 18 ; a plurality of burners 8 are evenly arranged at the lower part of the furnace body 18 along the length direction of the furnace body 18 .

[0040] Further optionally, the furnace body 18 is provided with a plurality of temperature measuring ports along its length direction, and the temperature measuring ports are connected to a temperature measuring device to facilitate real-time monitoring of the temperature at different length positions inside the furnace body 18.

[0041] Further optionally, the combustion gas pipeline 5, the liquefied gas pipeline 6, the burner 8 and the straw gas pipeline 7 are arranged from top to bottom on the same side of the furnace body 18, and the combustion gas pipeline 5, the liquefied gas pipeline 6 and the straw gas pipeline 7 are respectively provided with branch outlets corresponding to the positions of each burner 8, and each burner 8 is connected to the corresponding branch outlets of the combustion gas pipeline 5 and the straw gas pipeline 7 through a first branch pipe 19 and a second branch pipe 20, respectively, and the second branch pipe 20 is connected to the corresponding branch outlet of the liquefied gas pipeline 6 through a third branch pipe 21;

[0042] A flame detector is provided at the burner 8 , and an ignition transformer 22 is provided below the burner 8 .

[0043] The inlet and outlet of the combustion-supporting gas pipeline 5 are both connected to an air supply device for inputting air into the combustion-supporting gas pipeline 5, and the remaining air can be returned to the air supply device. The inlet and outlet of the liquefied gas pipeline 6 are both connected to a liquefied gas supply device for inputting liquefied gas into the liquefied gas pipeline 6, and the remaining liquefied gas can be returned to the liquefied gas supply device. The inlet and outlet of the straw gas pipeline 7 are both connected to a straw gas supply device for inputting straw gas into the straw gas pipeline 7, and the remaining straw gas can be returned to the straw gas supply device.

[0044] Further optionally, the first branch pipe 19 is provided with a combustion-supporting gas regulating valve, the second branch pipe 20 is provided with a straw gas electromagnetic shut-off valve and a straw gas regulating valve, and the third branch pipe 21 is provided with a liquefied gas electromagnetic shut-off valve and a liquefied gas regulating valve, which are used to respectively adjust the supply and flow of combustion-supporting gas, straw gas and liquefied gas.

[0045] Further optionally, an exhaust gas outlet 23 is provided at one end of the furnace body 18 close to the material inlet for discharging the exhaust gas inside the furnace body 18; a second bracket is provided on the outside of the pyrolysis kiln 2 for supporting the furnace body 18, the combustion-supporting gas pipeline 5, the liquefied gas pipeline 6 and the straw gas pipeline 7.

[0046] The furnace body 18 described in the present invention can be a conventional biomass pyrolysis kiln 2 on the market.

[0047] Optionally, the sedimentation separation tower 3 includes a discharge hopper 24, a connection part 25 and a separation part from bottom to top, and the material outlet of the pyrolysis kiln 2 is connected to the docking port on the side of the connection part 25, so that the biomass gas and biomass char obtained by pyrolysis in the furnace body 18 are discharged into the sedimentation separation tower 3;

[0048] The separation section includes an inclined plate separation area 26 and a spiral separation area 27 from bottom to top. A plurality of pairs of separation plate groups are provided inside the inclined plate separation area 26. Each pair of separation plate groups includes two inclined plates 28 that are inclined to each other and form an "eight" shape. The separation plate groups are evenly arranged in the inclined plate separation area 26.

[0049] The spiral separation zone 27 includes at least one spirally coiled tube 29 , the top outlet of the spirally coiled tube 29 is the first exhaust port 9 , and the bottom opening of the discharge hopper 24 is the discharge port.

[0050] Further optionally, the discharge hopper 24 is funnel-shaped, which is convenient for receiving and discharging the biochar discharged from the separation unit. The biochar is discharged from the discharge port, and the discharge port can be connected to the existing biochar cooling and processing device in the field, so as to finally obtain biochar for use in the fertilizer field.

[0051] Further optionally, the top of the discharge hopper 24 and the connecting portion 25 are integrally formed, and the connecting portion 25 is a square box body, which is convenient for docking with the material outlet of the furnace body 18.

[0052] Further optionally, the inclined plate separation zone 26 is provided with several layers of separation plate groups, each layer is provided with several pairs of separation plate groups, and is evenly arranged in the inclined plate separation zone 26, so that the gas rising from the connection portion 25 is separated multiple times, so that the biomass charcoal and other solid impurities fall downward into the discharge hopper 24, and the biomass gas enters the spiral separation zone 27 upward to further separate the solids;

[0053] A conical cover plate 30 is provided on the top of the inclined plate separation zone 26 . A through hole is provided in the center of the conical cover plate 30 . The through hole connects the inclined plate separation zone 26 and the spiral separation zone 27 .

[0054] Further optionally, the two inclined plates 28 of the separation plate group are respectively connected to a rotating shaft, and the inclined plates 28 are driven to rotate by the rotating shaft to change the inclination angle of the inclined plates 28. According to the actual air flow velocity in the sedimentation separation tower 3, the opening and closing angles of the two inclined plates 28 are adjusted to improve the gas-solid separation efficiency.

[0055] Further optionally, the spiral separation zone 27 has a cylindrical shape, and a spirally coiled tube 29 is provided in the inner cavity 31 of the spiral separation zone 27. The bottom opening of the spirally coiled tube 29 is connected to the through hole of the conical cover plate 30, and the rising airflow of the inclined plate separation zone 26 is introduced into the spirally coiled tube 29. The spirally coiled tube 29 is coiled several times for further gas-solid separation.

[0056] Further optionally, a third bracket is provided on the outer side of the sedimentation separation tower 3 for supporting the sedimentation separation tower 3 .

[0057] The sedimentation separation tower 3 of the present invention is used to separate the gas-solid mixture material discharged from the pyrolysis kiln 2. A two-stage separation mechanism is set up. The gas-solid mixture material first passes through several layers of separation plate groups in the inclined plate separation area 26. The "eight"-shaped inclined plate 28 can block most of the solids and make the solids slide down along the inclined plate 28 to the discharge hopper 24. Then the air flow carries a small amount of solids and continues to rise to the spiral separation area 27, and enters the spiral winding tube 29, and spirally rises along the spiral winding tube 29. Due to the multiple obstruction effects of the spiral winding tube 29 on the solids, gas-solid separation is performed again.

[0058] Further optionally, a straw gas preheating inlet 32 ​​is provided at the top of the spiral separation zone 27, and the straw gas preheating inlet 32 ​​is connected to the inner cavity 31 of the spiral separation zone 27; a heat exchange interlayer 33 is provided on the outside of the inclined plate separation zone 26, and the heat exchange interlayer 33 is connected to the inner cavity 31 of the spiral separation zone 27, and a straw gas preheating outlet 34 is provided at the bottom of the heat exchange interlayer 33, and the straw gas preheating outlet 34 is connected to the inlet of the straw gas pipeline 7.

[0059] Optionally, the wood vinegar recovery unit 4 includes a cooling pipe 10, a spray pipe 11 and a post-processing pipe connected in series, wherein the cooling pipe 10 is provided with a first air inlet at the top and a second air outlet at the bottom; the spray pipe 11 is provided with a second air inlet at the bottom and a third air outlet at the top; the post-processing pipe is provided with a third air inlet at the bottom and a fourth air outlet at the top;

[0060] The first exhaust port 9 is connected to the first air inlet, the second exhaust port is connected to the second air inlet, the third exhaust port is connected to the third air inlet, and the fourth exhaust port is connected to the straw gas preheating inlet 32;

[0061] The cooling pipe 10 and the spray pipe 11 are both arranged outside the sedimentation separation tower 3 , and the post-processing pipe is located above the sedimentation separation tower 3 .

[0062] Further optionally, a high-boiling-point component recovery tank 12 is provided at the bottom of the cooling tube 10, with the second exhaust port located above the high-boiling-point component recovery tank 12. A cooling interlayer 35 is provided on the outside of the cooling tube 10, with a water outlet and a water inlet at the top and bottom of the cooling interlayer 35, respectively, for supplying cooling water to the cooling interlayer 35 to condense the high-boiling-point components within the cooling tube 10. The biomass gas separated by the spiral separation zone 27 contains combustible straw gas, vaporized wood vinegar, vaporized impurities, and a very small amount of solid impurities. The biomass gas passes through the cooling tube 10 from top to bottom and is cooled. The high-boiling-point impurities are first condensed and formed into liquid, which then falls into the high-boiling-point component recovery tank 12, and the remaining gas is input into the spray pipe 11.

[0063] Optionally, a wood vinegar recovery tank 13 is provided at the bottom of the spray pipe 11, with the second air inlet located above the wood vinegar recovery tank 13. A first spray water pipe 36 is provided at the top of the spray pipe 11, with the third air outlet located below the first spray water pipe 36. The gas treated by the cooling pipe 10 passes from bottom to top through the spray pipe 11, where it comes into countercurrent contact with the liquid sprayed from the first spray water pipe 36, washing out the wood vinegar component in the gas to form wood vinegar. This is then collected in the wood vinegar recovery tank 13, and the remaining gas is fed into a post-processing pipe.

[0064] Optional, such as Figure 5 As shown, the post-treatment pipe is a secondary spray pipe 37. A second spray water pipe 38 is provided at the top of the secondary spray pipe 37, and the bottom outlet is connected to the first spray water pipe 36. The gas treated by the spray pipe 11 passes from bottom to top through the secondary spray pipe 37, where it comes into countercurrent contact with the liquid sprayed from the second spray water pipe 38. This washes out the remaining wood vinegar components in the gas, forming a lower-concentration wood vinegar, which then flows into the first spray water pipe 36 and serves as the supply liquid for the first spray water pipe 36.

[0065] Optionally, the post-processing pipe is a gas-liquid separator, and the bottom outlet of the gas-liquid separator is connected to the first spray water pipe 36 to separate the liquid from the gas processed by the spray pipe 11 and serve as the supply liquid for the first spray water pipe 36 .

[0066] The liquid supplied to the second spray water pipe 38 may be tap water or deionized water, and the water inlet of the first spray water pipe 36 may also be connected to a water supply device in parallel to supply tap water or deionized water.

[0067] The combustible straw gas obtained after separation and purification by the wood vinegar recovery unit 4 is cooled and sprayed at a lower temperature. The gas is fed back to the inner cavity 31 of the spiral separation zone 27 and the heat exchange interlayer 33 of the inclined plate separation zone 26, exchanges heat with the rising hot gas, and is then fed into the straw gas pipeline 7 to fully utilize the heat.

[0068] The traditional process is to directly use the biomass gas produced by the pyrolysis kiln 2 to produce crude wood vinegar. The crude wood vinegar is of poor quality and has many impurities. It also needs to be processed multiple times to obtain refined wood vinegar before being used. The present invention is based on the characteristics of the biomass gas produced by the pyrolysis kiln 2. It directly separates and processes the biomass gas. It first undergoes two physical separations to fully remove biochar and solid impurities. Then, it is condensed and cooled to condense high-boiling substances, which is equivalent to purification. The gas is then rinsed to produce wood vinegar. The wood vinegar obtained in this way is much better in quality than traditional crude wood vinegar and can be directly used. Even if it continues to be refined, it is simpler and less energy-consuming than the traditional method. Finally, the gas is purified by a post-processing tube to improve the combustion efficiency of straw gas.

[0069] On the other hand, the layout of the wood vinegar recovery unit 4 is cleverly designed by utilizing the flow direction of the gas and liquid inside the cooling pipe 10, the spray pipe 11 and the post-processing pipe, that is, the cooling pipe 10 and the spray pipe 11 are both arranged on the outside of the sedimentation separation tower 3, and the post-processing pipe is above the sedimentation separation tower 3, which not only saves space but also makes full use of the third bracket to support the wood vinegar recovery unit 4.

Claims

1. A system for producing wood vinegar from agricultural straw, characterized in that: The invention comprises a screw feeder, a pyrolysis kiln, a sedimentation separation tower and a wood vinegar recovery unit connected in sequence, wherein the discharge port of the screw feeder is connected to the material inlet of the pyrolysis kiln for feeding the crushed straw into the pyrolysis kiln for pyrolysis; The side of the pyrolysis kiln is provided with a combustion-supporting gas pipeline, a liquefied gas pipeline, a straw gas pipeline and a number of evenly distributed burners, each burner is connected to the combustion-supporting gas pipeline and the straw gas pipeline through a pipeline, and the straw gas pipeline is connected to the liquefied gas pipeline through a pipeline; The top of the sedimentation separation tower is provided with a first exhaust port, and the bottom is provided with a discharge port for discharging the biomass charcoal generated by the pyrolysis kiln; the first exhaust port is connected to the wood vinegar recovery unit, and is used to input the biomass gas after gas-solid separation into the wood vinegar recovery unit; The wood vinegar recovery unit comprises a cooling pipe and a spray pipe connected in series, and a high boiling point component recovery tank and a wood vinegar recovery tank are respectively provided at the bottom of the cooling pipe and the spray pipe; The sedimentation separation tower includes a discharge hopper, a connecting part and a separation part from bottom to top. The material outlet of the pyrolysis kiln is connected to the docking port on the side of the connecting part, and the biomass gas and biomass char obtained by pyrolysis in the furnace body are discharged into the sedimentation separation tower; The separation part includes an inclined plate separation area and a spiral separation area from bottom to top. A plurality of pairs of separation plate groups are arranged inside the inclined plate separation area. Each pair of separation plate groups includes two inclined plates that are inclined to each other and form an "eight" shape. The spiral separation zone includes at least one spirally coiled tube, the top outlet of the spirally coiled tube is the first exhaust port, and the bottom opening of the discharge hopper is the discharge port.

2. The system for producing wood vinegar from agricultural straw according to claim 1, wherein: The spiral feeder includes a feed hopper, an inclined spiral feed pipe, a feed screw motor and a lock fan; the height of the inlet of the spiral feed pipe is lower than the height of the outlet of the spiral feed pipe, and a feed screw motor is provided on the upper part or top side of the spiral feed pipe, which is used to connect and drive the spiral feed rod in the spiral feed pipe to rotate.

3. The system for producing wood vinegar from agricultural straw according to claim 1, wherein: The pyrolysis kiln includes an inclined furnace body and a combustion-supporting gas pipeline, a liquefied gas pipeline, a straw gas pipeline, and a plurality of burners located on the same side of the furnace body. The furnace body is horizontal and tubular. The height of the material inlet of the pyrolysis kiln is greater than the height of its material outlet, so that the biomass gas and biomass char obtained by pyrolysis of straw in the furnace body are discharged into the sedimentation separation tower along the inclined furnace body. The combustion-supporting gas pipeline, the liquefied gas pipeline and the straw gas pipeline are all parallel to the furnace body; and a plurality of burners are evenly arranged at the lower part of the furnace body along the length direction of the furnace body.

4. The system for producing wood vinegar from agricultural straw according to claim 1, wherein: The inclined plate separation area is provided with several layers of separation plate groups, each layer is provided with several pairs of separation plate groups, and is evenly arranged in the inclined plate separation area; A conical cover plate is provided on the top of the inclined plate separation zone, and a through hole is provided at the center of the conical cover plate. The through hole communicates with the inclined plate separation zone and the spiral separation zone.

5. The system for producing wood vinegar from agricultural straw according to claim 4, characterized in that: The spiral separation zone has a cylindrical shape, and a spirally coiled tube is provided in the inner cavity of the spiral separation zone. The bottom opening of the spirally coiled tube is connected to the through hole of the conical cover plate, and the rising airflow in the inclined plate separation zone is introduced into the spirally coiled tube. The spirally coiled tube is coiled several times for further gas-solid separation.

6. The system for producing wood vinegar from agricultural straw according to claim 5, characterized in that: A straw gas preheating inlet is provided at the top of the spiral separation zone, which is connected to the inner cavity of the spiral separation zone; a heat exchange interlayer is provided on the outside of the inclined plate separation zone, which is connected to the inner cavity of the spiral separation zone, and a straw gas preheating outlet is provided at the bottom of the heat exchange interlayer, which is connected to the straw gas inlet.

7. The system for producing wood vinegar from agricultural straw according to claim 6, characterized in that: The wood vinegar recovery unit includes a cooling pipe, a spray pipe and a post-processing pipe connected in series, wherein the top of the cooling pipe is provided with a first air inlet and the bottom is provided with a second air outlet; the bottom of the spray pipe is provided with a second air inlet and the top is provided with a third air outlet; the bottom of the post-processing pipe is provided with a third air inlet and the top is provided with a fourth air outlet; The first exhaust port is connected to the first air inlet, the second exhaust port is connected to the second air inlet, the third exhaust port is connected to the third air inlet, and the fourth exhaust port is connected to the straw gas preheating inlet; The cooling pipe and the spray pipe are both arranged on the outside of the sedimentation separation tower, and the post-processing pipe is located above the sedimentation separation tower.

8. The system for producing wood vinegar from agricultural straw according to claim 7, characterized in that: A high-boiling-point component recovery tank is provided at the bottom of the cooling pipe, and the second exhaust port is located above the high-boiling-point component recovery tank; a cooling interlayer is provided on the outside of the cooling pipe, and a water outlet and a water inlet are respectively provided at the upper and lower parts of the cooling interlayer, which are used to pass cooling water into the cooling interlayer to condense the high-boiling-point components in the cooling pipe.

9. The system for producing wood vinegar from agricultural straw according to claim 8, characterized in that: A wood vinegar recovery tank is provided at the bottom of the spray pipe, and the second air inlet is located above the wood vinegar recovery tank; a first spray water pipe is provided at the top of the spray pipe, and the third exhaust port is located below the first spray water pipe.

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