An apparatus for preparing a carbon-based soil conditioner by coupling biomass and coal

Abstract

The present invention relates to the technical field of soil conditioner preparation, and specifically to a device for preparing a carbon-based soil conditioner by coupling biomass and coal. The device includes a baking oven, a straw shredding tank, a pulverized coal tank, an additive tank, a water tank, a mixing main pipe, a stirring tank, a booster pump, an entrained flow gasifier, and an activation bed. The straw shredding tank, the pulverized coal tank, the additive tank, and the water tank are all connected to the mixing main pipe. The mixing main pipe is connected to the feed inlet of the stirring tank. The discharge port of the stirring tank is connected to the booster pump. The entrained flow gasifier includes a furnace body and a furnace feed port, a residue port, and a gas port extending from the furnace body. The furnace feed port is connected to the booster pump, and the residue port is connected to the activation bed. The baking oven is used for pre-baking the straw. After the straw is pre-baked, it is ground and pulverized and placed into the straw shredding tank. The stirring tank includes a tank body, a motor, a main shaft, a revolution frame, a driving wheel, a driven wheel, and a guide plate. The driving wheel actively searches for uneven positions of water and coal, and the driven wheel reciprocates radially to improve the mixing effect of the water-coal slurry.

Description

Technical Field

[0001] The present invention relates to the technical field of soil conditioner preparation, and specifically to a device for coupling biomass and coal to prepare a carbon-based soil conditioner. Background Art

[0002] Based on China's coal-dominated energy national conditions and the proposal of the dual-carbon strategy, the coupled utilization of biomass and coal will be an important way for large-scale biomass consumption. However, the differences in density, calorific value, ignition point, and ash fusibility between biomass and coal have led to the poor co-utilization of biomass and coal. Water coal slurry is a combustible black slurry with good fluidity and stability, which is convenient for storage and transportation and can be atomized for combustion. It is not only a clean energy with high combustion efficiency and low pollution, but also can be used to make a slurry with biomass and coal for better co-utilization. At the same time, during the biomass gasification process, the gasification temperature is low, and the content of effective nutrient components in the generated biomass ash residue is low, all of which are fixed oxides. Although the temperature during the coal gasification process is high, it is not enough to melt and activate the effective nutrient components in the fly ash. Fly ash needs to be further activated as a soil conditioner. By coupling the gasification of biomass and coal, the high alkali metal content in biomass reduces the ash melting point of the gasification ash residue, resulting in a large increase in the effective nutrient components in the co-gasification ash residue and a significant improvement in the soil improvement effect.

[0003] Existing technologies mostly only consider crushing and mixing the residue after biomass pyrolysis and the residue after coal combustion. The element mixing is not thorough and the element water solubility is insufficient. Now, it is considered to mix biomass and pulverized coal before gasification oxidation and then carry out gasification oxidation together. However, the inability to continuously mix the slurry evenly is a practical problem restricting the pre-mixed soil conditioner. Summary of the Invention

[0004] The present invention provides a device for coupling biomass and coal to prepare a carbon-based soil conditioner, which can effectively solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for coupling biomass and coal to prepare a carbon-based soil conditioner, the device includes a baking oven, a straw shredding tank, a pulverized coal tank, an additive tank, a water tank, a mixing main pipe, a stirring tank, a booster pump, a entrained flow gasifier, and an activation bed.

[0007] The straw chip tank, pulverized coal tank, additive tank, and water tank are all connected to the mixing main pipe. The mixing main pipe is connected to the inlet of the stirring tank. The outlet of the stirring tank is connected to a booster pump. The entrained flow gasifier includes a furnace body and a furnace inlet, a residue outlet, and a gas outlet extending from the furnace body. The furnace inlet is connected to the booster pump, the residue outlet is connected to the activation bed, and the baking oven is used for pre-treating the straw by baking. After the straw is pre-treated by baking, it is ground and pulverized and placed into the straw chip tank.

[0008] The baking oven is placed relatively independently beside the stirring tank and the entrained flow gasifier. The raw straw is pre-treated in the baking oven, dehydrated to a dry state, sent to a ball mill for grinding, and the grinding particle size is determined by the screen aperture. The straw chips that meet the requirements are placed into the straw chip tank for waiting to be taken. The materials stored in the straw chip tank, pulverized coal tank, additive tank, and water tank are the materials that will be fully stirred and mixed in the stirring tank. They are put into the stirring tank in proportion to be mixed into water-coal slurry, and then are pressurized and transported by the booster pump to the entrained flow gasifier for gasification to obtain gasification residues. The residues are physically activated by carbon dioxide gas in the activation bed to obtain the final soil conditioner. The output of the activation bed is collected, transferred, and transported by an aggregate truck.

[0009] There is a mass component ratio mechanism at the mixing main pipe. The ratio mechanism for quality detection of the water tank is a flow meter, and the ratio mechanism for quality detection of the straw chip tank, pulverized coal tank, and additive tank is a transfer weighing pan controlled by rhythm.

[0010] The straw chip tank discharges materials into the transfer weighing pan. After reaching the expected quality, the transfer weighing pan dumps or opens the falling channel and other ways to pour the materials into the mixing main pipe. The same applies to the transfer weighing pans connected to the outlets of the pulverized coal tank and the additive tank.

[0011] The stirring tank includes a tank body, a motor, a main shaft, a revolution frame, and an automatic wheel. The motor is installed in the center of the top of the tank body. The motor faces downward and sets the main shaft into the tank body. The bottom end of the main shaft is rotationally connected to the inner bottom surface of the tank body. A revolution frame is arranged on the main shaft. The revolution frame is in the shape of a rectangular or oval waist-shaped frame. The midpoints of two opposite sides of the revolution frame are penetrated and fixed by the main shaft. Radial sliding grooves extending around the main shaft are arranged on the two sides of the revolution frame penetrated by the main shaft. The axle of the automatic wheel is arranged in the sliding groove. Except for the degrees of freedom of sliding along the sliding groove and rotating along its own axis, other degrees of freedom of the automatic wheel are restricted. The material density of the automatic wheel is between the density of pure water and the density of water-coal mass.

[0012] An inlet is arranged at the outer edge position of the top of the tank body and connected to the mixing main pipe, and an outlet is arranged on the bottom wall surface of the tank body and connected to the booster pump.

[0013] Inside the tank, stirring and mixing operations are carried out through the revolution frame and the automatic wheel. Among them, while the automatic wheel is pushed by the revolution frame to revolve, it can rotate on its own to achieve an additional stirring action. When the automatic wheel revolves around the main shaft, a centrifugal effect is generated. Its radial degree of freedom is not restricted and it can freely move radially to a suitable position. This suitable position is the uneven place of water and water-coal mass. In the mixture, water and pulverized coal are two major components with large specific gravity. In a uniform water-coal slurry, it is a uniform mixture of pulverized coal, water, straw fragments, and additives. Pulverized coal and water account for the largest proportion, and the specific gravity of the mixture is about 1.2 - 1.3. The specific gravity of the non-uniformly mixed pulverized coal is greater than 1.3 and exists in the form of water-coal mass in the stirring tank. Water acts as a binder to prevent the pulverized coal from being fully dispersed. The specific gravity of pure water is 1. During the stirring process, the water-coal mass aggregates on the periphery, and the coal-deficient components are in the inner periphery, with a density difference. The density of the automatic wheel is between the two. When sliding along the chute under the centrifugal effect, the automatic wheel will actively find the approximate boundary between the water-coal mass and water. After that, the movement of the automatic wheel is as shown. When revolving around the main shaft, if there is no rotation, the linear velocities of the blades on the outside and inside of the automatic wheel in the radial direction are not equal. Unequal linear velocities encounter different resistances in the medium, and the resistance difference causes the automatic wheel to regain its angular velocity of rotation. Therefore, the revolution and rotation of the automatic wheel are synchronized. When the automatic wheel rotates at the position where the medium is unevenly distributed radially, it can have an additional stirring effect of mixing the inner and outer components together, improving the stirring effect in the stirring tank.

[0014] The stirring tank also includes a passive wheel and a guide plate. There are several revolution frames, all of which are fixed on the main shaft. The shape of the passive wheel is the same as that of the automatic wheel except for the length of the wheel shaft protruding. The passive wheel is also slidably installed in the chute. The guide plate is installed on the inner wall of the tank. The plane of the guide plate is perpendicular to the main shaft. The guide plate is located on both sides of the revolution frame where the passive wheel is located. An eccentric circular groove is provided on the surface of the guide plate facing the revolution frame. The center of the eccentric circular groove does not coincide with the main shaft. The wheel shaft of the passive wheel is embedded in the eccentric circular groove and can slide along the eccentric circular groove.

[0015] The wheel shaft of the passive wheel is lengthened and embedded in the eccentric circular groove. In this way, when the passive wheel is driven by the revolution frame to revolve around the main shaft, its radial position is restricted by the eccentric circular groove, and the passive wheel performs forced radial reciprocating movement. During the radial reciprocating movement, the freedom of rotation of the passive wheel is not restricted and it can still rotate. The passive wheel and the automatic wheel together achieve an improvement in the stirring effect.

[0016] The oxygen concentration in the baking oven is lower than 10%. The low-oxygen environment in the baking oven prevents the straw from pyrolyzing during the baking process, resulting in a loss of beneficial elements and a decrease in their content in the soil conditioner. After the straw pyrolyzes, the calorific value in the entrained flow gasifier also decreases correspondingly, affecting the calorific value output of the entrained flow gasifier.

[0017] The water tank is of a closed structure, with a water inlet pipe arranged at the top of the water tank and a water outlet pipe arranged at the bottom. The device for preparing the carbon-based soil conditioner further includes a compressor, an air inlet pipe, and an air outlet pipe. The compressor is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is inserted into the bottom inside the water tank. One end of the air outlet pipe is connected to the top of the water tank, and the other end is connected to the atmosphere gas inlet of the baking oven. Pressure reducing valves are arranged on both the water outlet pipe and the air outlet pipe, and the pressure inside the water tank is 3 to 5 atmospheres.

[0018] The compressor pumps air into the water tank. By utilizing the difference in the solubility of nitrogen and oxygen in water, both increase during pressurization. Passing the air through the water in the water tank under a pressurized environment can obtain a gas mixture with a reduced oxygen concentration. The gas transported through the air outlet pipe to the baking oven is a gas with a low oxygen concentration, achieving the acquisition of low-oxygen gas without combustion. A certain amount of oxygen is dissolved in the water, and during the subsequent transportation process, there is a certain oxygen concentration in the water coal slurry, which can improve the gasification efficiency in the entrained flow gasifier. Removing oxygen from the air is relatively easy to achieve, but it is mostly carried out by combustion, resulting in the consumption of chemicals. The gas composition at the feed inlet of the entrained flow gasifier mostly uses air because it is difficult to obtain a gas with an oxygen concentration higher than that of air. In this application, by enriching a certain amount of oxygen in the water, as the water coal slurry enters the entrained flow gasifier, the main processes experienced by the water coal slurry are: vaporization - pyrolysis - oxidation process. During the vaporization process, the oxygen component overflows and serves as a supplement to the oxygen component in the air, increasing the oxygen concentration in the gasification atmosphere.

[0019] A conveyor belt is provided inside the activation bed. One end of the upper surface of the conveyor belt is located below the connection between the activation bed and the residue outlet, and the other end of the upper surface of the conveyor belt is at the outlet of the activation bed.

[0020] The conveyor belt moves slowly, carrying the gasification residue coming from the entrained flow gasifier and retaining it in the carbon dioxide atmosphere inside the activation bed for a period of time, and then discharging it to the aggregate truck.

[0021] The additive added to the water coal slurry in the additive tank is sodium lignosulfonate.

[0022] The mass ratios of the materials added from the straw shredding tank 21, the pulverized coal tank 22, the additive tank 23, and the water tank 24 to the mixing main pipe 25 are 15%, 49%, 0.5%, and 35.5% respectively. The pulverized coal in the pulverized coal tank 22 is mixed at a ratio of 1:1 for 100 - mesh and 200 - mesh. The entrained flow gasifier 5 controls the temperature at 1000 °C, the oxygen component flow rate at 100 - 300 mL / min, the gasification duration at 0 - 30 min, the carbon dioxide flow rate inside the activation bed 6 at 100 - 300 mL / min, and maintains the space temperature at 1000 °C for physical activation for 3 h.

[0023] Compared with the prior art, in the present invention, the solid product of roasted rice straw is partially used to replace the pulverized coal in the water coal slurry for pulping, reducing the carbon emissions generated by the consumption of fossil fuels; the roasted straw is used to prepare a composite water coal slurry and gasified, and the gasification residue obtained is activated online for soil improvement, avoiding the problem of low activity of traditional fly ash for soil improvement, and at the same time increasing the activity of the nutrient components of the rice straw ash residue, making high-value utilization of the bulk solid waste fly ash and biomass power plant ash residue; the present invention uses the waste rice straw raw material for roasting pretreatment to achieve comprehensive resource utilization and solve the problem of waste pollution. There are a driving wheel that actively seeks the uneven position of the water coal and a driven wheel that reciprocates radially in the stirring tank. Both the driving wheel and the driven wheel have a self-rotation speed due to the different linear speeds of the inner and outer blades in the radial direction while revolving, thereby guiding the medium in the tank to transfer along the radius direction of the main shaft, improving the preparation efficiency and mixing effect of the water coal slurry, and making the gasification process in the entrained flow gasifier more uniform and efficient. The water added to the water coal slurry is water that has absorbed oxygen, which is not only used to obtain low-oxygen gas during roasting but also used as a means to increase the oxygen concentration in the entrained flow gasifier, reducing and increasing the oxygen concentration at two places respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic flow chart of the present invention;

[0026] Figure 2 is a schematic structural diagram of the stirring tank of the present invention;

[0027] Figure 3 is a three-dimensional structural diagram of the main shaft, revolving frame, and driving wheel of the present invention;

[0028] Figure 4 is a schematic diagram of the revolution and self-rotation principle of the driving wheel of the present invention;

[0029] Figure 5 is a three-dimensional structural diagram of the main shaft, revolving frame, driven wheel, and guide disc of the present invention;

[0030] Figure 6 is a schematic structural diagram of the water tank of the present invention;

[0031] Reference numerals in the figures: 1, baking oven; 21, straw shredding tank; 22, pulverized coal tank; 23, additive tank; 24, water tank; 241, water inlet pipe; 242, water outlet pipe; 25, mixing main pipe; 3, stirring tank; 31, tank body; 32, motor; 33, main shaft; 34, revolution frame; 341, chute; 35, automatic wheel; 36, driven wheel; 37, guide plate; 371, eccentric circular groove; 4, booster pump; 5, entrained flow gasifier; 51, furnace feed inlet; 52, residue outlet; 53, gas outlet; 6, activation bed; 7, aggregate truck; 8, conveyor belt; 91, compressor; 92, inlet pipe; 93, outlet pipe. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0033] A device for coupling biomass and coal to prepare a carbon-based soil conditioner, the device includes a baking oven 1, a straw shredding tank 21, a pulverized coal tank 22, an additive tank 23, a water tank 24, a mixing main pipe 25, a stirring tank 3, a booster pump 4, an entrained flow gasifier 5, and an activation bed 6.

[0034] The straw shredding tank 21, the pulverized coal tank 22, the additive tank 23, and the water tank 24 are all connected to the mixing main pipe 25. The mixing main pipe 25 is connected to the feed inlet of the stirring tank 3. The discharge port of the stirring tank 3 is connected to the booster pump 4. The entrained flow gasifier 5 includes a furnace body and a furnace feed inlet 51, a residue outlet 52, and a gas outlet 53 extending from the furnace body. The furnace feed inlet 51 is connected to the booster pump 4, the residue outlet 52 is connected to the activation bed 6, and the baking oven 1 is used for pre-treating the straw by baking. After the straw is pre-treated by baking, it is ground and pulverized and placed into the straw shredding tank 21.

[0035] As Figure 1 shown, the baking oven 1 is placed relatively independently beside the stirring tank 3 and the entrained flow gasifier 5. The raw material straw is pre-treated in the baking oven, dehydrated to a dry state, sent to a ball mill for grinding, and the grinding particle size is determined by the screen aperture. The straw shreds that meet the requirements are placed into the straw shredding tank 21 for waiting to be taken. The materials stored in the straw shredding tank 21, the pulverized coal tank 22, the additive tank 23, and the water tank 24 are the materials to be fully stirred and mixed in the stirring tank 3. They are put into the stirring tank 3 in proportion to be mixed into water coal slurry, and then the booster pump 4 pressurizes and transports it to the entrained flow gasifier 5 for gasification to obtain gasification residues. The residues are physically activated by carbon dioxide gas in the activation bed 6 to obtain the final soil conditioner. The output of the activation bed 6 is collected, transferred, and transported by an aggregate truck 7.

[0036] The mixing main pipe 25 is equipped with a mass group distribution ratio mechanism. The ratio mechanism uses a flowmeter for the mass detection of the water tank 24, and uses a transfer weighing tray controlled by a beat for the mass detection of the straw shredding tank 21, the pulverized coal tank 22, and the additive tank 23.

[0037] The straw shredding tank 21 discharges materials into the transfer weighing tray. After reaching the expected quality, the transfer weighing tray dumps or opens the falling channel to pour the materials into the mixing main pipe 25. The same applies to the transfer weighing trays connected to the discharge ports of the pulverized coal tank 22 and the additive tank 23.

[0038] The stirring tank 3 includes a tank body 31, a motor 32, a main shaft 33, a revolution frame 34, and an automatic wheel 35. The motor 32 is installed in the center of the top of the tank body 31. The motor 32 is arranged downward into the tank body 31 with the main shaft 33. The bottom end of the main shaft 33 is rotatably connected to the inner bottom surface of the tank body 31. The revolution frame 34 is arranged on the main shaft 33. The revolution frame 34 is in the shape of a rectangular or oval waist-shaped frame. The midpoints of two opposite sides of the revolution frame 34 are penetrated and fixed by the main shaft 33. On the two sides of the revolution frame 34 penetrated by the main shaft 33, sliding grooves 341 extending radially around the main shaft 33 are arranged. The axle of the automatic wheel 35 is arranged in the sliding grooves 341. Except for the degrees of freedom of sliding along the sliding grooves 341 and rotating along its own axis, all other degrees of freedom of the automatic wheel 35 are restricted. The material density of the automatic wheel 35 is between the density of pure water and the density of the water-coal mass.

[0039] An inlet is arranged at the outer edge position of the top of the tank body 31 to connect to the mixing main pipe 25, and an outlet is arranged on the bottom wall surface of the tank body 31 to connect to the booster pump 4.

[0040] As Figures 1 - 2 shown, the stirring and mixing operation is carried out in the tank body 31 through the revolution frame 34 and the automatic wheel 35. Among them, while the automatic wheel 35 is pushed by the revolution frame 34 to perform revolution, it can perform self-rotation to achieve an additional stirring action. As Figure 3 、 4As shown in the figure, when the automatic wheel 35 revolves around the main shaft 33, a centrifugal effect is generated. Its radial degree of freedom is not restricted and it can freely move radially to a suitable position. This suitable position is the uneven part of water and water-coal mass. In the mixture, water and pulverized coal are two major components with large specific gravity. In a uniform water-coal slurry, it is a uniform mixture of pulverized coal, water, straw fragments, and additives. Pulverized coal and water account for the largest proportion, and the specific gravity of the mixture is about 1.2 - 1.3. The specific gravity of the non-uniformly mixed pulverized coal is greater than 1.3, and it exists in the form of water-coal mass in the mixing tank 3. Water acts as a binder to prevent the pulverized coal from being fully dispersed, while the specific gravity of pure water is 1. During the stirring process, the water-coal mass accumulates on the periphery, and the coal-deficient component is in the inner periphery, with a density difference. The density of the automatic wheel 35 is between the two. When the centrifugal effect causes it to slide along the chute 341, the automatic wheel 35 will actively find the approximate boundary between the water-coal mass and water. After that, the movement of the automatic wheel 35 is as shown in Figure 4. When revolving around the main shaft 33, if there is no self-rotation, the blades on the outer radius of the automatic wheel 35 have a linear velocity V1, and the blades on the inner radius have a linear velocity V2. The linear velocities of the two are not equal, so different resistances are encountered in the medium. The resistance difference causes the automatic wheel 35 to regain an angular velocity of self-rotation W. Therefore, the revolution and self-rotation of the automatic wheel 35 are synchronized. When the automatic wheel 35 rotates on its own at the position where the medium is unevenly distributed radially, it can have an additional stirring effect of mixing the inner and outer components together, improving the stirring effect in the mixing tank 3. The automatic wheel 35 is a common form with several blades distributed circumferentially on the wheel shaft.

[0041] The mixing tank 3 further includes a driven wheel 36 and a guide disk 37. There are several revolution frames 34, all of which are fixed on the main shaft 33. The shape of the driven wheel 36 is the same as that of the automatic wheel 35 except for the length of the wheel shaft protruding. The driven wheel 36 is also slidably installed in the chute 341. The guide disk 37 is installed on the inner wall of the tank body 31. The plane of the guide disk 37 is perpendicular to the main shaft 33. The guide disk 37 is located on both sides of the revolution frame 34 where the driven wheel 36 is located. An eccentric circular groove 371 is provided on the surface of the guide disk 37 facing the revolution frame 34. The center of the eccentric circular groove 371 does not coincide with the main shaft 33. The wheel shaft of the driven wheel 36 is embedded in the eccentric circular groove 371 and can slide along the eccentric circular groove 371.

[0042] As Figure 2 、 5 As shown in the figure, the wheel shaft of the driven wheel 36 is lengthened and embedded in the eccentric circular groove 371. In this way, when the driven wheel 36 is driven by the revolution frame 34 to revolve around the main shaft 33, its radial position is restricted by the eccentric circular groove 371, and the driven wheel 36 is forced to move radially back and forth. During the radial reciprocating movement, the self-rotation degree of freedom of the driven wheel 36 is not restricted and can still proceed. The driven wheel 36 and the automatic wheel 35 together achieve an improved stirring effect.

[0043] The oxygen concentration in the baking oven 1 is lower than 10%. The low-oxygen environment in the baking oven 1 prevents the straw from pyrolyzing during the baking process, resulting in the loss of beneficial elements and a decrease in their content in the soil conditioner. After the straw pyrolyzes, the calorific value in the entrained flow gasifier also decreases correspondingly, affecting the calorific value output of the entrained flow gasifier.

[0044] The water tank 24 is of a closed structure. The water inlet pipe 241 is arranged at the top of the water tank 24, and the water outlet pipe 242 is arranged at the bottom. The device for preparing the carbon-based soil conditioner further includes a compressor 91, an air inlet pipe 92, and an air outlet pipe 93. One end of the compressor 91 is connected to one end of the air inlet pipe 92, the other end of the air inlet pipe 92 is inserted into the bottom of the water tank 24, one end of the air outlet pipe 93 is connected to the top of the water tank 24, and the other end is connected to the atmosphere gas inlet of the baking oven 1. Pressure reducing valves are arranged on both the water outlet pipe 242 and the air outlet pipe 93. The pressure in the water tank 24 is 3 to 5 atmospheres.

[0045] As Figure 1 , 6 shown, the compressor 91 pumps air into the water tank 24. Utilizing the difference in the solubility of nitrogen and oxygen in water, under standard conditions, one volume of water dissolves 0.049 volumes of oxygen and 0.024 volumes of nitrogen. When pressurized, both increase. Passing the air through the water in the water tank 24 under a pressurized environment can obtain a gas mixture with a reduced oxygen concentration. The gas transported through the air outlet pipe 93 to the baking oven 1 is a gas with a low oxygen concentration, achieving the acquisition of low-oxygen gas without combustion. A certain amount of oxygen is dissolved in the water. During the subsequent transportation process, there is a certain oxygen concentration in the water slurry, which can improve the gasification efficiency in the entrained flow gasifier 5. Removing oxygen from the air is relatively easy to achieve, but it is mostly carried out by combustion, resulting in the consumption of chemicals. The gas components at the feed inlet of the entrained flow gasifier mostly use air because it is difficult to obtain a gas with an oxygen concentration higher than that of air. In this application, by enriching a certain amount of oxygen in the water, as the water slurry enters the entrained flow gasifier, the main processes experienced by the water slurry are: vaporization - pyrolysis - oxidation processes. During the vaporization process, the oxygen component overflows and serves as a supplement to the oxygen component in the air, increasing the oxygen concentration in the gasification atmosphere.

[0046] A conveyor belt 8 is provided in the activation bed 6. One end of the upper surface of the conveyor belt 8 is located below the connection between the activation bed 6 and the residue outlet 52, and the other end of the upper surface of the conveyor belt 8 is at the discharge outlet of the activation bed 6.

[0047] As Figure 1 shown, the conveyor belt 8 slowly moves, carrying the gasification residue from the entrained flow gasifier 5 and retaining it in the carbon dioxide atmosphere in the activation bed 6 for a period of time and then discharging it onto the aggregate truck 7.

[0048] The additive added to the water slurry in the additive tank 23 is sodium lignosulfonate.

[0049] The mass ratios of the materials added from the straw chip tank 21, pulverized coal tank 22, additive tank 23, and water tank 24 to the mixing main pipe 25 are 15%, 49%, 0.5%, and 35.5% respectively. The pulverized coal in the pulverized coal tank 22 is mixed at a ratio of one to one for 100-mesh and 200-mesh. The entrained flow gasifier 5 is controlled at a temperature of 1000°C, the oxygen component flow rate is 100 - 300 mL / min, the gasification duration is 0 - 30 min, the carbon dioxide flow rate in the activation bed 6 is 100 - 300 mL / min, and the physical activation is carried out at a space temperature of 1000°C for 3 h.

[0050] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0051] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An apparatus for coupling biomass and coal to prepare a carbon-based soil conditioner, characterized in that: The device for preparing carbon-based soil improver includes a baking oven (1), a straw shredding tank (21), a pulverized coal tank (22), an additive tank (23), a water tank (24), a mixing main pipe (25), a stirring tank (3), a booster pump (4), a entrained flow gasifier (5), and an activation bed (6). The straw shredding tank (21), the pulverized coal tank (22), the additive tank (23), and the water tank (24) are all connected to the mixing main pipe (25). The mixing main pipe (25) is connected to the feed inlet of the stirring tank (3). The discharge outlet of the stirring tank (3) is connected to the booster pump (4). The entrained flow gasifier (5) includes a furnace body and a furnace feed inlet (51), a residue outlet (52), and a gas outlet (53) extending from the furnace body. The furnace feed inlet (51) is connected to the booster pump (4). The residue outlet (52) is connected to the activation bed (6). The baking oven (1) is used for pre-treating the straw by baking. After the straw is baked and pre-treated, it is ground and pulverized and placed into the straw shredding tank (21). A mass component ratio mechanism is provided at the mixing main pipe (25). The ratio mechanism uses a flowmeter for the mass detection of the water tank (24), and uses a transfer weighing pan controlled by a beat for the mass detection of the straw shredding tank (21), the pulverized coal tank (22), and the additive tank (23). The stirring tank (3) includes a tank body (31), a motor (32), a main shaft (33), a revolution frame (34), and a self-acting wheel (35). The motor (32) is installed at the center of the top of the tank body (31). The motor (32) is arranged downward into the tank body (31) with the main shaft (33). The bottom end of the main shaft (33) is rotatably connected to the inner bottom surface of the tank body (31). The revolution frame (34) is arranged on the main shaft (33). The revolution frame (34) is in the shape of a rectangular or oval waist-shaped frame. The midpoints of two opposite sides of the revolution frame (34) are penetrated and fixed by the main shaft (33). Sliding grooves (341) extending radially with the main shaft (33) as the center are provided on the two sides of the revolution frame (34) penetrated by the main shaft (33). The axle of the self-acting wheel (35) is arranged in the sliding groove (341). Except for the degrees of freedom of sliding along the sliding groove (341) and rotating along its own axis, the other degrees of freedom of the self-acting wheel (35) are restricted. The material density of the self-acting wheel (35) is between the density of pure water and the density of the water-coal mass. An inlet is provided at the outer edge position of the top of the tank body (31) and is connected to the mixing main pipe (25). An outlet is provided on the bottom wall surface of the tank body (31) and is connected to the booster pump (4).

2. The device for coupling biomass and coal to prepare a carbon-based soil conditioner according to claim 1, wherein: The stirring tank (3) further includes a driven wheel (36) and a guide disc (37). There are several revolution frames (34) which are all fixed on the main shaft (33). The shape of the driven wheel (36) is the same as that of the driving wheel (35) except for the protruding length of the wheel shaft. The driven wheel (36) is also slidably installed in the chute (341). The guide disc (37) is installed on the inner wall of the tank body (31). The plane of the guide disc (37) is perpendicular to the main shaft (33). The guide disc (37) is located on both sides of the revolution frame (34) where the driven wheel (36) is located. An eccentric circular groove (371) is provided on the surface of the guide disc (37) facing the revolution frame (34). The center of the eccentric circular groove (371) does not coincide with the main shaft (33). The wheel shaft of the driven wheel (36) is embedded in the eccentric circular groove (371) and can slide along the eccentric circular groove (371).

3. The device for coupling biomass and coal to prepare a carbon-based soil conditioner according to claim 1, wherein: The oxygen concentration in the baking oven (1) is lower than 10%.

4. The device for coupling biomass and coal to prepare a carbon-based soil conditioner according to claim 3, wherein: The water tank (24) is of a closed structure. A water inlet pipe (241) is arranged at the top of the water tank (24), and a water outlet pipe (242) is arranged at the bottom. The device for preparing the carbon-based soil conditioner further includes a compressor (91), an air inlet pipe (92), and an air outlet pipe (93). One end of the compressor (91) is connected to one end of the air inlet pipe (92). The other end of the air inlet pipe (92) is inserted into the bottom inside the water tank (24). One end of the air outlet pipe (93) is connected to the top of the water tank (24), and the other end is connected to the atmosphere gas inlet of the baking oven (1). Pressure reducing valves are arranged on both the water outlet pipe (242) and the air outlet pipe (93). The pressure inside the water tank (24) is 3 to 5 atmospheres.

5. The device for coupling biomass and coal to prepare a carbon-based soil conditioner according to claim 1, characterized in that: A conveyor belt (8) is arranged inside the activation bed (6). One end of the upper surface of the conveyor belt (8) is located below the connection between the activation bed (6) and the residue outlet (52), and the other end of the upper surface of the conveyor belt (8) is at the discharge outlet of the activation bed (6).

6. The device for coupling biomass and coal to prepare a carbon-based soil conditioner according to claim 1, wherein: The additive added to the water coal slurry in the additive tank (23) is sodium lignosulfonate.

7. The device for coupling biomass and coal to prepare a carbon-based soil conditioner according to claim 6, characterized in that: The mass ratios of the materials added from the straw shredding tank (21), the pulverized coal tank (22), the additive tank (23), and the water tank (24) to the mixing main pipe (25) are 15%, 49%, 0.5%, and 35.5% respectively. The pulverized coal in the pulverized coal tank (22) is mixed in a ratio of 1:1 for 100 mesh and 200 mesh. The temperature of the entrained flow gasifier (5) is controlled at 1000°C, the oxygen component flow rate is 100 - 300 mL / min, the gasification duration is 0 - 30 min, the carbon dioxide flow rate inside the activation bed (6) is 100 - 300 mL / min, and physical activation is carried out at a space temperature of 1000°C for 3 h.

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