Control method and device for compound fertilizer preparation

Abstract

The invention discloses a control method and device for preparation of a compound fertilizer, and relates to the technical field of compound fertilizers. Adjusting a preset ratio of the auxiliary solution to the auxiliary powder according to the component data of the biochar raw material, and generating an addition ratio of the auxiliary solution according to the preset ratio; placing the charcoal raw material and the auxiliary powder in a mixing device according to the preset proportion, and stirring and mixing based on the mixing device to obtain mixed powder; carrying out oscillation treatment on the mixed powder in mixing equipment, and spraying an auxiliary solution to the mixed powder according to the adding proportion to obtain a compound fertilizer matrix; and placing the compound fertilizer matrix in a coating machine, and adjusting the internal humidity of the coating machine to form compound fertilizer particles. The auxiliary solution and the biochar raw material are mixed in a spraying manner, solid-liquid separation arrangement is reduced, and biochar drying energy consumption is reduced, so that the preparation cost of the compound fertilizer is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compound fertilizers, and in particular to a control method and device for preparing compound fertilizers. Background Art

[0002] Compound fertilizer refers to a chemical fertilizer containing two or more nutrients including nitrogen, phosphorus and potassium. Compound fertilizer has the advantages of high nutrient content, few by-components and good physical properties. It plays a very important role in balanced fertilization, improving fertilizer utilization and promoting high and stable yields of crops.

[0003] Current biochar compound fertilizers are mainly made by soaking biochar in a fertilizer solution, allowing the biochar to adsorb nutrients in the fertilizer solution. This requires real-time adjustment of the solution pH to improve the adsorption efficiency of the biochar, and solid-liquid separation and other operations after adsorption are completed. This results in a cumbersome process for compound fertilizer production, high energy consumption for drying the biochar during large-scale production, and increased preparation costs for compound fertilizers. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a control method and device for the preparation of compound fertilizers. The auxiliary solution and auxiliary powder are directly contacted with the biochar raw material for mixing, and adhesion and bonding are performed based on the auxiliary solution, thereby improving the stability of the compound fertilizer preparation. The auxiliary solution and biochar raw material are mixed by spraying, reducing the solid-liquid separation arrangement and reducing the energy consumption of biochar drying, thereby reducing the preparation cost of the compound fertilizer.

[0005] The present invention provides a control method for preparing compound fertilizer, the control method comprising:

[0006] Testing biochar raw material samples to obtain composition data of biochar raw materials;

[0007] Adjusting a preset ratio of the auxiliary solution to the auxiliary powder according to the composition data of the biochar raw material, and generating an addition ratio of the auxiliary solution according to the preset ratio;

[0008] placing the biochar raw material and the auxiliary powder in a mixing device according to the preset ratio, and stirring and mixing them based on the mixing device to obtain a mixed powder;

[0009] The mixed powder is subjected to an oscillation treatment in a mixing device, and an auxiliary solution is sprayed onto the mixed powder according to the addition ratio to obtain a composite fertilizer matrix;

[0010] The compound fertilizer matrix is placed in a coating machine, and the humidity inside the coating machine is adjusted to form compound fertilizer particles.

[0011] Furthermore, the testing of the biochar raw material sample to obtain the composition data of the biochar raw material includes:

[0012] Extracting several groups of biochar raw material samples at several locations of the biochar raw material;

[0013] The biochar raw material samples were analyzed by an elemental analyzer to obtain the element composition ratio of each group of biochar raw material samples;

[0014] The element composition ratios of several groups of biochar raw material samples were averaged to obtain the composition data of the biochar raw material.

[0015] Furthermore, performing elemental analysis on the biochar raw material samples by an elemental analyzer to obtain the elemental composition ratio of each group of biochar raw material samples includes:

[0016] sintering the biochar raw material sample at a high temperature to completely oxidize the biochar raw material sample;

[0017] The gases released after oxidation of the biochar raw material sample are subjected to chromatographic separation and detector quantitative analysis to obtain elemental data of the biochar raw material sample.

[0018] Furthermore, the adjusting the preset ratio of the auxiliary solution and the auxiliary powder according to the composition data of the biochar raw material and generating the addition ratio of the auxiliary solution according to the preset ratio includes:

[0019] According to the composition of the auxiliary solution and the auxiliary powder, the configuration ratio of the auxiliary solution and the auxiliary powder is adjusted in combination with the composition data of the biochar raw material, and the preset ratio of the biochar, the auxiliary solution and the auxiliary powder is adjusted;

[0020] The preset ratio of the auxiliary solution is adjusted, and the addition ratio of the auxiliary solution is obtained by increasing the preset ratio of the auxiliary solution.

[0021] Furthermore, the biochar raw material and the auxiliary powder are placed in a mixing device according to the preset ratio, and stirred and mixed by the mixing device to obtain a mixed powder, which includes:

[0022] The biochar raw material and the auxiliary powder are placed in a mixing device according to a preset ratio, the rotation speed of the mixing device is set to 500 r / min, and the biochar raw material and the auxiliary powder are continuously stirred for 30 minutes, so that the biochar and the auxiliary powder are fully mixed to obtain a mixed powder.

[0023] Furthermore, the step of oscillating the mixed powder in a mixing device and spraying the auxiliary solution onto the mixed powder according to the addition ratio to obtain a composite fertilizer matrix includes:

[0024] Evenly spreading the mixed powder in the mixing device, and spraying the auxiliary solution spray on the mixed powder;

[0025] The mixed powder is vibrated based on the vibration plate at the bottom of the mixing equipment. During the vibration process, the auxiliary solution is continuously sprayed on the powder to fully blend the auxiliary solution and the mixed powder.

[0026] The mixed powder in the mixing equipment is heated and the compound fertilizer matrix is obtained by heat preservation and drying.

[0027] Furthermore, the step of heating the mixed powder in the mixing device and obtaining the compound fertilizer matrix by heat preservation and drying comprises:

[0028] After the auxiliary solution is sprayed in the mixing device, the mixing device may be heated so that the temperature of the mixing device gradually increases;

[0029] When the internal working temperature of the mixing device reaches 55° C., the internal working environment temperature of the mixing device is adjusted to maintain at 55° C., so that the mixed powder is dried at 55° C.

[0030] Furthermore, the step of placing the compound fertilizer substrate in a coating machine and adjusting the humidity inside the coating machine to form compound fertilizer particles includes:

[0031] Adding the compound fertilizer matrix and the binder into a coating machine;

[0032] Spray water mist in the coating machine, adjust the internal environmental humidity of the coating machine to above 30%, and coat the compound fertilizer matrix under the humidity condition to form compound fertilizer particles.

[0033] Furthermore, the step of placing the compound fertilizer substrate in a coating machine and adjusting the humidity inside the coating machine to form compound fertilizer particles further comprises:

[0034] The air inlet temperature of the coating machine is set between 50° C. and 80° C., and air is continuously supplied to the inside of the coating machine to promote the coating material to form a film on the surface of the compound fertilizer base particles.

[0035] The present invention also provides a control device for preparing compound fertilizer, the control device is used to implement the control method for preparing compound fertilizer, and the control device includes:

[0036] Detection component: used to detect biochar raw material samples and obtain the composition data of biochar raw materials;

[0037] Proportioning component: used to adjust the preset ratio of the auxiliary solution and the auxiliary powder according to the composition data of the biochar raw material, and generate the addition ratio of the auxiliary solution according to the preset ratio;

[0038] The first mixing component is used to place the biochar raw material and the auxiliary powder in the mixing device according to the preset ratio, and stir and mix them based on the mixing device to obtain a mixed powder;

[0039] A second mixing component is used for oscillating the mixed powder in a mixing device and spraying an auxiliary solution onto the mixed powder according to the addition ratio to obtain a compound fertilizer matrix;

[0040] Coating assembly: used to place the compound fertilizer matrix in the coating machine, adjust the humidity inside the coating machine, and form compound fertilizer particles.

[0041] The present invention provides a control method and device for preparing compound fertilizers. By setting an auxiliary solution to bond and mix biochar raw materials and auxiliary powders, and adsorbing and mixing the auxiliary powders and auxiliary solution based on biochar, the adsorption efficiency of biochar on fertilizers of different elements can be improved, and the preparation quality of compound fertilizers can be improved. In combination with a coating machine, the compound fertilizer is coated with a film, which can improve the structural stability of the compound fertilizer. The auxiliary solution and biochar raw materials are mixed by spraying, which reduces the solid-liquid separation layout and reduces the energy consumption of biochar drying, thereby reducing the preparation cost of the compound fertilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a flow chart of a control method for preparing compound fertilizer according to an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the adsorption effect of biochar raw materials on nutrient elements under the heating state in an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of a control device for preparing compound fertilizer in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] Example 1:

[0047] Figure 1 A flow chart of a control method for preparing compound fertilizer according to an embodiment of the present invention is shown. The control method for preparing compound fertilizer includes:

[0048] S11: Testing the biochar raw material sample to obtain the composition data of the biochar raw material.

[0049] In this embodiment, rice straw is used as the raw material for preparing biochar. After the rice straw is dried, it is placed in a pulverizing device for pulverization. The biochar raw material is prepared by pyrolyzing the rice straw at a preset pyrolysis temperature.

[0050] Furthermore, in this embodiment, the pyrolysis temperature of rice straw is set to 350°C, and the rice straw is placed in a pyrolysis furnace, and the pyrolysis furnace is heated at a heating rate of 5°C / min. After reaching the pyrolysis temperature of 350°C, the pyrolysis is carried out by keeping warm until the rice straw in the pyrolysis furnace can be completely carbonized to obtain the biochar raw material.

[0051] Specifically, several groups of biochar raw material samples are extracted from several positions of the biochar raw material, and biochar raw material samples are extracted from different positions of the biochar raw material. By setting up several groups of biochar raw material samples to analyze the components of biochar at different positions, the accuracy of the biochar raw material component analysis can be ensured.

[0052] The biochar raw material samples were subjected to elemental analysis by an elemental analyzer to obtain the elemental composition ratio of each group of biochar raw material samples. The biochar raw material samples were sintered at a high temperature, and the high temperature sintering temperature was set between 900°C and 1200°C so that the biochar raw material samples could be completely oxidized to generate CO2, H2O, N2 / NO x , SO2 and other gases, and the element data of the biochar raw material sample is obtained by chromatographic separation and detector quantitative analysis of the gas after oxidation of the biochar raw material sample.

[0053] The element composition ratios of several groups of biochar raw material samples are averaged to obtain the composition data of the biochar raw material. The element composition analysis of the biochar raw material is performed based on the several groups of biochar raw material samples to improve the accuracy of the analysis of the several groups of biochar raw materials.

[0054] Specifically, in this embodiment, the biochar raw material sample is placed in a sintering furnace for high-temperature sintering, and the sintering temperature is set at 1000°C. After the biochar raw material sample is cooled, it is weighed, and the ash content of the biochar raw material sample is calculated. The calculation formula is:

[0055]

[0056] Among them, A is the ash content of the biochar raw material sample, M is the mass of the biochar raw material sample before sintering, M1 is the mass of the sintering furnace in the empty furnace state, and M2 is the sum of the masses of the sintering furnace and the biochar raw material sample.

[0057] S12: adjusting a preset ratio of the auxiliary solution to the auxiliary powder according to the composition data of the biochar raw material, and generating an addition ratio of the auxiliary solution according to the preset ratio.

[0058] Specifically, according to the components of the auxiliary solution and the auxiliary powder, the configuration ratio of the auxiliary solution and the auxiliary powder is adjusted in combination with the composition data of the biochar raw material, and the preset ratio of the biochar, the auxiliary solution and the auxiliary powder is adjusted. According to the elemental ratio composition of the biochar, the mixing ratio of the auxiliary solution and the auxiliary powder is set.

[0059] Furthermore, the auxiliary solution can be one or more of ammonium salt solution, phosphate solution and nitrate solution, and the auxiliary powder can be one or more of urea powder and superphosphate powder. A variety of fertilizers are adsorbed on biochar to meet the needs of preparing compound fertilizers.

[0060] According to the component data of the biochar raw material, the mixing ratio of the auxiliary solution and the auxiliary powder is set. When the N element content of the biochar raw material is low, the ratio of urea powder or ammonium nitrogen fertilizer solution is increased. If the K element content of the biochar raw material is high, the configuration ratio of potassium fertilizer powder is reduced, thereby avoiding the situation where the potassium element in the compound fertilizer is too high and causes salt damage to the plants.

[0061] Specifically, the preset ratio of the auxiliary solution is adjusted, and the addition ratio of the auxiliary solution is obtained after the preset ratio of the auxiliary solution is increased. In this embodiment, the auxiliary solution is increased by 20% according to the preset ratio. Since the auxiliary solution is easily lost during the transmission and spraying process, which affects the preparation effect of the compound fertilizer, by adjusting the configuration ratio of the auxiliary solution, the impact of the auxiliary solution loss on the preparation of the compound fertilizer can be reduced, thereby ensuring the preparation effect of the compound fertilizer.

[0062] S13: placing the biochar raw material and the auxiliary powder in a mixing device according to the preset ratio, and stirring and mixing them based on the mixing device to obtain a mixed powder.

[0063] Specifically, the biochar raw material and the auxiliary powder are placed in a mixing device according to a preset ratio, the rotation speed of the mixing device is set to 500 r / min, and the biochar raw material and the auxiliary powder are continuously stirred for 30 minutes, so that the biochar and the auxiliary powder are fully mixed to obtain a mixed powder.

[0064] In this embodiment, the preset ratio of the biochar raw material and the auxiliary powder is set to 50:30, and the rotation speed of the mixing device is set to 500 r / min, so that the biochar raw material and the auxiliary powder are fully mixed.

[0065] Furthermore, in this embodiment, the biochar raw material and the auxiliary powder can be mixed by feeding, the biochar raw material is added to the mixing device at a rate of 5 cm / min, the auxiliary powder is added to the mixing device at a rate of 5 cm / min, the biochar raw material and the auxiliary powder are fed simultaneously, and the mixing device is stirred during the feeding process of the biochar raw material and the auxiliary powder to achieve sufficient mixing of the biochar raw material and the auxiliary powder.

[0066] Specifically, the biochar raw material has a porous structure, and the pore diameter of the biochar is d, and the value range of d is: 3nm≤d≤150nm, so that the biochar can have good adsorption performance. In this embodiment, the auxiliary powder is ground and placed in a grinding device, and the grinding degree of the grinding device is adjusted to 2, so that the grinding device can grind the auxiliary powder into fine powder, so that when the auxiliary powder is mixed with the biochar raw material, the adsorption effect of the biochar raw material on the auxiliary powder can be improved, so that the auxiliary powder can be fully filled in the pores of the biochar raw material to achieve a good mixing effect.

[0067] S14: oscillating the mixed powder in a mixing device, and spraying an auxiliary solution onto the mixed powder according to the addition ratio to obtain a compound fertilizer matrix.

[0068] The mixed powder is evenly spread in the mixing device, and an auxiliary solution spray is sprayed above the mixed powder. The space above the mixed powder is filled with the auxiliary spray. When the mixed powder is oscillated based on the mixing device, the mixed powder raised in the mixing device can come into contact with the auxiliary solution spray, and the mixed powder is bonded based on the auxiliary solution spray. The auxiliary solution can adhere to the surface of the biochar raw material so that the biochar raw material absorbs the auxiliary solution.

[0069] Furthermore, due to the unequal mass between the biochar raw material and the auxiliary powder, when the mixing device oscillates the mixed powder, the mixed powder raised in the mixing device can easily cause separation of the biochar raw material and the auxiliary powder, that is, the biochar raw material and the auxiliary powder are separated during the oscillation process. By spraying the auxiliary solution in the space above the mixed powder, the solution spray can moisten the surface of the biochar raw material, so that the auxiliary powder can adhere to the surface of the biochar raw material, avoiding the separation of the biochar raw material and the auxiliary powder, thereby ensuring the mixing stability of the mixed powder.

[0070] The mixed powder is oscillated based on the vibration plate at the bottom of the mixing device, and the auxiliary solution is continuously sprayed on the powder during the oscillation process, so that the auxiliary solution and the mixed powder are fully fused. A vibration plate is set at the bottom of the mixing device, and the mixed powder at the bottom of the mixing device is oscillated based on the vibration plate, so that the mixed powder is in a vibrating motion state inside the mixing device. By spraying the auxiliary solution on the mixed powder, the auxiliary solution can cover and adhere to the mixed powder, thereby satisfying the mixing between the auxiliary solution and the biochar raw material.

[0071] The mixed powder in the mixing device is heated, and the compound fertilizer matrix is obtained by heat preservation and drying. After the spraying of the auxiliary solution in the mixing device is completed, the mixing device can be heated to gradually heat up the mixing device. When the internal working temperature of the mixing device reaches 55°C, the internal working environment temperature of the mixing device is adjusted to maintain at 55°C, so that the mixed powder is dried at 55°C, so that the moisture content of the mixed powder is reduced, so that the coating operation of the coating machine can be carried out subsequently.

[0072] Specifically, Figure 2 A schematic diagram shows the adsorption effect of biochar raw materials on nutrient elements in a heated state in an embodiment of the present invention. The biochar raw materials are mixed with the auxiliary solution and auxiliary powder based on physical adsorption. By heating the mixed powder in the mixing device, the nutrients in the auxiliary solution and auxiliary powder can be adsorbed on the surface and pores of the biochar raw materials, thereby meeting the adsorption requirements of the biochar raw materials for nutrient elements.

[0073] Please refer to Figure 2 During the heating process of the mixed powder, the biochar raw material has a good adsorption effect on potassium between 35°C and 45°C. At temperatures above 45°C, the adsorption effect of the biochar raw material on potassium decreases, the activity of potassium ions increases, and migration is prone to occur.

[0074] The biochar raw material has a good adsorption effect on phosphorus between 45°C and 55°C, and has a good adsorption effect on nitrogen between 35°C and 40°C. At 55°C, the adsorption rate of nitrogen, phosphorus and potassium nutrients by the biochar raw material can reach 55% to 60%. Since the biochar raw material is mixed with the auxiliary powder and auxiliary solution based on the pore structure and surface adsorption effect, the loss of nitrogen, phosphorus and potassium nutrients can be further reduced, thereby improving the adsorption effect of the biochar raw material on nitrogen, phosphorus and potassium nutrients. In this embodiment, the heat preservation and drying temperature in the mixing equipment is set to 55°C, which can meet the effective adsorption of nitrogen, phosphorus and potassium nutrients by the biochar raw material, thereby ensuring the fertilization effect of the compound fertilizer.

[0075] Furthermore, when the mixed powder in the mixing device is dried, the mixed powder can be stirred based on the stirring mechanism in the mixing device, thereby improving the drying efficiency of the mixed powder and reducing the moisture content of the mixed powder to 5%, thereby avoiding interference from the moisture of the mixed powder when the coating film is coated by the coating machine.

[0076] S15: placing the compound fertilizer substrate in a coating machine, adjusting the humidity inside the coating machine, and forming compound fertilizer particles.

[0077] The compound fertilizer matrix and the binder are added into a coating machine.

[0078] Specifically, the compound fertilizer matrix is crushed and sieved. The compound fertilizer matrix is crushed by a crushing device, and the crushed compound fertilizer matrix is sieved and filtered. The screen parameters are set between 80 mesh and 100 mesh to ensure the uniformity of the compound fertilizer matrix particles. The particle size of the compound fertilizer matrix particles is between 0.15 mm and 0.25 mm, thereby meeting the coating requirements of the coating machine.

[0079] Furthermore, a binder is added to the compound fertilizer matrix, and the binder can be set as a clay mineral. Based on the clay mineral, the concave and convex positions on the surface of the biochar raw material in the compound fertilizer matrix can be filled, and the bonding connection between the biochar raw material, auxiliary powder and auxiliary solution elements can be achieved, thereby improving the stability of the preparation and production of the compound fertilizer.

[0080] Specifically, water mist is sprayed within the coating machine to adjust the internal humidity of the coating machine to above 30%. Under the humidity conditions, the compound fertilizer substrate is coated with a film to form compound fertilizer particles. Water mist is sprayed within the coating machine to adjust the working humidity of the coating machine to meet the requirements for compound fertilizer preparation. The compound fertilizer substrate is rotated and stirred at a uniform speed to ensure uniform rolling of the compound fertilizer substrate particles and prevent accumulation of the compound fertilizer substrate particles, thereby achieving the coating process of the compound fertilizer substrate particles.

[0081] Furthermore, according to the preparation requirements of the compound fertilizer, the internal working humidity of the coating machine can be adjusted between 30% and 50% to avoid the internal working humidity of the coating machine being too low, which may cause cracking of the coating film layer formed by the coating material. At the same time, it can avoid the internal working humidity of the coating machine being too high, which may cause adhesion between the various coating film layers.

[0082] Specifically, the air inlet temperature of the coating machine is set between 50° C. and 80° C., and air is continuously supplied to the inside of the coating machine to promote the film formation of the coating material on the surface of the compound fertilizer base particles, thereby avoiding degradation of heat-sensitive materials.

[0083] Furthermore, the atomization pressure of the coating machine is set to 0.2-0.5 MPa, and the coating liquid is atomized so that the coating liquid can be evenly covered on the surface of the compound fertilizer base particles in a spray manner and deposited on the surface of the compound fertilizer base particles to form a film layer structure.

[0084] Furthermore, the working time of the coating machine is set between 30 minutes and 90 minutes, and the working time of the coating machine is adjusted according to the weight of the compound fertilizer substrate, so that the coating machine can coat the particles of the compound fertilizer substrate to a thickness of between 50 μm and 200 μm to meet the coating and film requirements of the compound fertilizer substrate.

[0085] Furthermore, the coating machine is used to perform granulation and coating operations on the compound fertilizer matrix, so that a multi-layer film layer is formed on the surface of the compound fertilizer particles, which can plastic-seal and protect the compound fertilizer particles to avoid nutrient loss in the compound fertilizer. At the same time, during the fertilization process, the compound fertilizer can achieve the effect of slow-release nutrients, thereby improving the working reliability of the compound fertilizer.

[0086] An embodiment of the present invention provides a control method for preparing compound fertilizer. By setting an auxiliary solution to bond and mix the biochar raw material and auxiliary powder, and adsorbing and mixing the auxiliary powder and auxiliary solution based on biochar, the adsorption efficiency of biochar on fertilizers of different elements can be improved, and the preparation quality of the compound fertilizer can be improved. Combined with a coating machine to coat the compound fertilizer, the structural stability of the compound fertilizer can be improved.

[0087] Example 2:

[0088] Figure 3 A control device for preparing compound fertilizer according to an embodiment of the present invention is shown, and the control device includes:

[0089] Detection component 10: used to detect the biochar raw material sample and obtain the composition data of the biochar raw material.

[0090] Specifically, several groups of biochar raw material samples are extracted from several positions of the biochar raw material, and biochar raw material samples are extracted from different positions of the biochar raw material. By setting up several groups of biochar raw material samples to analyze the components of biochar at different positions, the accuracy of the biochar raw material component analysis can be ensured.

[0091] The biochar raw material samples were subjected to elemental analysis by an elemental analyzer to obtain the elemental composition ratio of each group of biochar raw material samples. The biochar raw material samples were sintered at a high temperature, and the high temperature sintering temperature was set between 900°C and 1200°C so that the biochar raw material samples could be completely oxidized to generate CO2, H2O, N2 / NO x , SO2 and other gases, and the element data of the biochar raw material sample is obtained by chromatographic separation and detector quantitative analysis of the gas after oxidation of the biochar raw material sample.

[0092] The element composition ratios of several groups of biochar raw material samples are averaged to obtain the composition data of the biochar raw material. The element composition analysis of the biochar raw material is performed based on the several groups of biochar raw material samples to improve the accuracy of the analysis of the several groups of biochar raw materials.

[0093] The proportioning component 20 is used to adjust the preset ratio of the auxiliary solution and the auxiliary powder according to the composition data of the biochar raw material, and generate the addition ratio of the auxiliary solution according to the preset ratio.

[0094] According to the component data of the biochar raw material, the mixing ratio of the auxiliary solution and the auxiliary powder is set. When the N element content of the biochar raw material is low, the ratio of urea powder or ammonium nitrogen fertilizer solution is increased. If the K element content of the biochar raw material is high, the configuration ratio of potassium fertilizer powder is reduced, thereby avoiding the situation where the potassium element in the compound fertilizer is too high and causes salt damage to the plants.

[0095] Specifically, the preset ratio of the auxiliary solution is adjusted, and the addition ratio of the auxiliary solution is obtained after the preset ratio of the auxiliary solution is increased. In this embodiment, the auxiliary solution is increased by 20% according to the preset ratio. Since the auxiliary solution is easily lost during the transmission and spraying process, which affects the preparation effect of the compound fertilizer, by adjusting the configuration ratio of the auxiliary solution, the impact of the auxiliary solution loss on the preparation of the compound fertilizer can be reduced, thereby ensuring the preparation effect of the compound fertilizer.

[0096] The first mixing component 30 is used to place the biochar raw material and the auxiliary powder in the mixing device according to the preset ratio, and stir and mix them based on the mixing device to obtain mixed powder.

[0097] Specifically, the biochar raw material and the auxiliary powder are placed in a mixing device according to a preset ratio, the rotation speed of the mixing device is set to 500 r / min, and the biochar raw material and the auxiliary powder are continuously stirred for 30 minutes, so that the biochar and the auxiliary powder are fully mixed to obtain a mixed powder.

[0098] In this embodiment, the preset ratio of the biochar raw material and the auxiliary powder is set to 50:30, and the rotation speed of the mixing device is set to 500 r / min, so that the biochar raw material and the auxiliary powder are fully mixed.

[0099] The second mixing component 40 is used for oscillating the mixed powder in the mixing device and spraying the auxiliary solution onto the mixed powder according to the addition ratio to obtain a compound fertilizer matrix.

[0100] The mixed powder is evenly spread in the mixing device, and an auxiliary solution spray is sprayed above the mixed powder. The space above the mixed powder is filled with the auxiliary spray. When the mixed powder is oscillated based on the mixing device, the mixed powder raised in the mixing device can come into contact with the auxiliary solution spray, and the mixed powder is bonded based on the auxiliary solution spray. The auxiliary solution can adhere to the surface of the biochar raw material so that the biochar raw material absorbs the auxiliary solution.

[0101] Furthermore, due to the unequal mass between the biochar raw material and the auxiliary powder, when the mixing device oscillates the mixed powder, the mixed powder raised in the mixing device can easily cause separation of the biochar raw material and the auxiliary powder, that is, the biochar raw material and the auxiliary powder are separated during the oscillation process. By spraying the auxiliary solution in the space above the mixed powder, the solution spray can moisten the surface of the biochar raw material, so that the auxiliary powder can adhere to the surface of the biochar raw material, avoiding the separation of the biochar raw material and the auxiliary powder, thereby ensuring the mixing stability of the mixed powder.

[0102] Coating assembly 50: used to place the compound fertilizer substrate in the coating machine, adjust the humidity inside the coating machine, and form compound fertilizer particles.

[0103] The compound fertilizer matrix and the binder are added into a coating machine.

[0104] Specifically, the compound fertilizer matrix is crushed and sieved. The compound fertilizer matrix is crushed by a crushing device, and the crushed compound fertilizer matrix is sieved and filtered. The screen parameters are set between 80 mesh and 100 mesh to ensure the uniformity of the compound fertilizer matrix particles. The particle size of the compound fertilizer matrix particles is between 0.15 mm and 0.25 mm, thereby meeting the coating requirements of the coating machine.

[0105] Furthermore, a binder is added to the compound fertilizer matrix, and the binder can be set as a clay mineral. Based on the clay mineral, the concave and convex positions on the surface of the biochar raw material in the compound fertilizer matrix can be filled, and the bonding connection between the biochar raw material, auxiliary powder and auxiliary solution elements can be achieved, thereby improving the stability of the preparation and production of the compound fertilizer.

[0106] An embodiment of the present invention provides a control device for preparing compound fertilizers. By setting an auxiliary solution to bond and mix the biochar raw material and auxiliary powder, and adsorbing and mixing the auxiliary powder and auxiliary solution based on biochar, the adsorption efficiency of biochar on fertilizers of different elements can be improved, and the preparation quality of the compound fertilizer can be improved. Combined with a coating machine to coat the compound fertilizer, the structural stability of the compound fertilizer can be improved.

[0107] In addition, the above is a detailed introduction to a control method and device for preparing compound fertilizers provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A control method for preparing compound fertilizer, characterized in that: The control method includes: Testing biochar raw material samples to obtain composition data of biochar raw materials; Adjusting a preset ratio of the auxiliary solution to the auxiliary powder according to the composition data of the biochar raw material, and generating an addition ratio of the auxiliary solution according to the preset ratio; placing the biochar raw material and the auxiliary powder in a mixing device according to the preset ratio, and stirring and mixing them based on the mixing device to obtain a mixed powder; The mixed powder is subjected to an oscillation treatment in a mixing device, and an auxiliary solution is sprayed onto the mixed powder according to the addition ratio to obtain a composite fertilizer matrix; The compound fertilizer matrix is placed in a coating machine, and the humidity inside the coating machine is adjusted to form compound fertilizer particles.

2. The control method for preparing compound fertilizer according to claim 1, wherein: The testing of the biochar raw material sample to obtain the composition data of the biochar raw material includes: Extracting several groups of biochar raw material samples at several locations of the biochar raw material; The biochar raw material samples were analyzed by an elemental analyzer to obtain the element composition ratio of each group of biochar raw material samples; The element composition ratios of several groups of biochar raw material samples were averaged to obtain the composition data of the biochar raw material.

3. The control method for preparing compound fertilizer according to claim 2, wherein: The elemental analysis of the biochar raw material samples by an element analyzer to obtain the element composition ratio of each group of biochar raw material samples includes: sintering the biochar raw material sample at a high temperature to completely oxidize the biochar raw material sample; The gases released after oxidation of the biochar raw material sample are subjected to chromatographic separation and detector quantitative analysis to obtain elemental data of the biochar raw material sample.

4. The control method for preparing compound fertilizer according to claim 1, wherein: The method of adjusting the preset ratio of the auxiliary solution and the auxiliary powder according to the composition data of the biochar raw material and generating the addition ratio of the auxiliary solution according to the preset ratio includes: According to the composition of the auxiliary solution and the auxiliary powder, the configuration ratio of the auxiliary solution and the auxiliary powder is adjusted in combination with the composition data of the biochar raw material, and the preset ratio of the biochar, the auxiliary solution and the auxiliary powder is adjusted; The preset ratio of the auxiliary solution is adjusted, and the addition ratio of the auxiliary solution is obtained by increasing the preset ratio of the auxiliary solution.

5. The control method for preparing compound fertilizer according to claim 1, wherein: The biochar raw material and the auxiliary powder are placed in a mixing device according to the preset ratio, and stirred and mixed by the mixing device to obtain a mixed powder, which includes: The biochar raw material and the auxiliary powder are placed in a mixing device according to a preset ratio, the rotation speed of the mixing device is set to 500 r / min, and the biochar raw material and the auxiliary powder are continuously stirred for 30 minutes, so that the biochar and the auxiliary powder are fully mixed to obtain a mixed powder.

6. The control method for preparing compound fertilizer according to claim 1, characterized in that: The step of oscillating the mixed powder in a mixing device and spraying the auxiliary solution onto the mixed powder according to the addition ratio to obtain a composite fertilizer matrix comprises: Evenly spreading the mixed powder in the mixing device, and spraying the auxiliary solution spray on the mixed powder; The mixed powder is vibrated based on the vibration plate at the bottom of the mixing equipment. During the vibration process, the auxiliary solution is continuously sprayed on the powder to fully blend the auxiliary solution and the mixed powder. The mixed powder in the mixing equipment is heated and the compound fertilizer matrix is obtained by heat preservation and drying.

7. The control method for preparing compound fertilizer according to claim 6, characterized in that: The method of heating the mixed powder in the mixing device and obtaining the compound fertilizer matrix by heat preservation and drying comprises: After the auxiliary solution is sprayed in the mixing device, the mixing device may be heated so that the temperature of the mixing device gradually increases; When the internal working temperature of the mixing device reaches 55°C, the internal working environment temperature of the mixing device is adjusted to maintain at 55°C, so that the mixed powder The drying operation was carried out under the conditions of ℃.

8. The control method for preparing compound fertilizer according to claim 1, wherein: The step of placing the compound fertilizer substrate in a coating machine and adjusting the humidity inside the coating machine to form compound fertilizer particles comprises: Adding the compound fertilizer matrix and the binder into a coating machine; Spray water mist in the coating machine, adjust the internal environmental humidity of the coating machine to above 30%, and coat the compound fertilizer matrix under the humidity condition to form compound fertilizer particles.

9. The control method for preparing compound fertilizer according to claim 8, characterized in that: The step of placing the compound fertilizer substrate in a coating machine and adjusting the humidity inside the coating machine to form compound fertilizer particles further comprises: The air inlet temperature of the coating machine is set between 50° C. and 80° C., and the coating material is promoted to form a film on the surface of the compound fertilizer base particles by continuously supplying air into the coating machine.

10. A control device for preparing compound fertilizer, characterized in that: The control device is used to implement the control method for preparing compound fertilizer according to any one of claims 1 to 9, and the control device includes: Detection component: used to detect biochar raw material samples and obtain the composition data of biochar raw materials; Proportioning component: used to adjust the preset ratio of the auxiliary solution and the auxiliary powder according to the composition data of the biochar raw material, and generate the addition ratio of the auxiliary solution according to the preset ratio; The first mixing component is used to place the biochar raw material and the auxiliary powder in the mixing device according to the preset ratio, and stir and mix them based on the mixing device to obtain a mixed powder; A second mixing component is used for oscillating the mixed powder in a mixing device and spraying an auxiliary solution onto the mixed powder according to the addition ratio to obtain a compound fertilizer matrix; Coating assembly: used to place the compound fertilizer matrix in the coating machine, adjust the humidity inside the coating machine, and form compound fertilizer particles.

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