A large-scale liquid-liquid mixing liquid fertilizer production system

Abstract

This utility model belongs to the field of agricultural production equipment technology, specifically relating to a large-scale liquid fertilizer production system for liquid-liquid mixing. It includes: several sets of mother liquor preparation units, configured to dissolve solid raw materials to form mother liquor; several sets of liquid raw material units, configured to store liquid raw materials; a finished product preparation unit, configured to mix the mother liquor and liquid raw materials to form finished liquid fertilizer; a finished product discharge unit, connected to the finished product preparation unit, configured to transport the liquid fertilizer to the planting area; and a control unit, electrically connected to the several sets of liquid raw material units, the finished product preparation unit, and the several sets of mother liquor preparation units, configured to control the operation of the liquid fertilizer production system. The purpose of this utility model is to solve the problems existing in the current liquid fertilizer production process, such as long production cycles, frequent quality problems, interactions between different raw materials, inaccurate feed rates, unstable component content, and the inability to provide timely feedback on testing.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural production equipment technology, and in particular relates to a large-scale liquid fertilizer production system for liquid-liquid mixing. Background Technology

[0002] In large-scale farms or agricultural bases, solid granular fertilizers or liquid fertilizers are typically the main sources of fertilizer. When using solid granular fertilizers, they need to be dissolved into liquid fertilizer on-site. However, the dissolution process is extremely cumbersome, requiring significant manual labor for stirring and real-time monitoring of the dissolution progress. In large-scale farms, this undoubtedly increases labor costs and management difficulty considerably. Liquid fertilizers, on the other hand, save labor and time and can be directly applied to integrated agricultural systems. However, their high procurement costs place a significant economic burden on agricultural production. Furthermore, especially in northern regions where irrigation water has high hardness, calcium and magnesium ions in the water easily react with fertilizer components when using liquid fertilizers, forming precipitates that can clog drippers, affecting irrigation and fertilization efficiency and reducing the utilization rate of liquid fertilizers. In addition, the nutrient ratios of liquid fertilizers are usually fixed, making it difficult to flexibly adjust them according to the nutrient absorption patterns of different crops at different growth stages. This results in fertilizer waste or insufficient nutrient supply to crops, hindering the economic benefits and sustainable development of large-scale agricultural planting.

[0003] Currently, large-scale farms typically use an on-site liquid fertilizer production and application method. This method involves dissolving solid raw materials in a mixing tank to create a mother liquor, then mixing the mother liquor with the liquid raw materials in a reaction vessel to form liquid fertilizer, which is then directly applied. This allows for flexible adjustments to the raw material ratio based on the nutrient absorption patterns of different crops at different growth stages, and the production speed can be adjusted at any time to control the yield of liquid fertilizer according to the scale of agricultural production. However, this method still has many problems: First, the dissolution process of solid raw materials causes a drop in water temperature and prolongs the dissolution time. During peak production periods, the raw materials are not completely dissolved due to the long dissolution time, resulting in long production cycles and frequent quality problems. Second, the same equipment is used for the production of different liquid fertilizers (the equipment purchase cost is expensive), and there is raw material residue in the conveying equipment, which leads to the reaction of residual raw materials with other types of raw materials and inaccurate feeding. Third, during the overwintering period and long-term storage of liquid raw materials, the liquid will separate into layers, resulting in inconsistent density and composition content between the upper and lower layers. Fourth, due to the above uncertainties, the quality of the finished liquid fertilizer is inconsistent, so frequent quality testing is required. However, the testing cycle is long, and the test results cannot be fed back in a timely manner. Often, the finished liquid fertilizer has already been mass-produced, stored, or even put into use before the test report arrives. It is impossible to play a real-time quality control role in the production process, making it difficult to ensure that each batch of liquid fertilizer meets the quality standards, which poses potential risks to crop growth and agricultural production safety on farms.

[0004] Based on the problems existing in the above-mentioned technologies, there is an urgent need in large-scale farms or agricultural bases for a liquid fertilizer production system that can be made and used immediately, has precise control, real-time detection and real-time quality control functions, and can adapt to the fertilizer demand during peak periods.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to solve the problems existing in the production process of liquid fertilizer, such as long production cycle, frequent quality problems, mutual reaction between different raw materials, inaccurate feed amount, unstable component content, and inability to provide timely feedback on testing. The invention provides a large-scale liquid fertilizer production system for liquid-liquid mixing, as detailed below:

[0007] A large-scale liquid fertilizer production system for liquid-liquid mixing includes:

[0008] Several sets of mother liquor preparation units, including tank-shaped dissolving devices, are configured to dissolve solid raw materials to form mother liquor;

[0009] Several sets of liquid raw material units, including storage tanks, are configured to store liquid raw materials;

[0010] The finished product preparation unit is connected to the mother liquor preparation unit and the liquid raw material unit respectively, and is configured to mix the mother liquor and liquid raw materials to form the finished liquid fertilizer;

[0011] The finished product discharge unit, connected to the finished product preparation unit, is configured to transport the liquid fertilizer to the planting area.

[0012] The control unit is electrically connected to the liquid raw material unit, the finished product preparation unit, and several sets of mother liquor preparation units, and is configured to control the operation of the liquid fertilizer production system.

[0013] Furthermore, the mother liquor preparation unit also includes:

[0014] The feeding device has a feed inlet at the top and a discharge outlet at the bottom; solid raw materials enter the feeding device through the feed inlet.

[0015] A conveying device, with one end located at the lower end of the discharge port of the feeding device and the other end located at the upper end of the inlet of the dissolving device, is electrically connected to the control unit and is configured to convey solid raw materials from the feeding device to the dissolving device.

[0016] It also includes a water supply device, one end of which is connected to a water source, and the other end is connected to the inlet of the dissolving device and electrically connected to the control unit.

[0017] Furthermore, the dissolving apparatus includes:

[0018] The stirring drive unit is electrically connected to the control unit;

[0019] A stirring unit is disposed inside the dissolving device, and its power input end is connected to the power output end of the stirring drive unit;

[0020] A density sensor array, located inside the dissolving device and electrically connected to the control unit, is configured to collect the density of the solution within the dissolving device.

[0021] A temperature sensor is installed inside the dissolving device and electrically connected to the control unit, and is configured to collect the temperature of the solution inside the dissolving device.

[0022] Furthermore, the density sensor group includes an upper density sensor, a middle density sensor, and a lower density sensor correspondingly arranged in the upper, middle, and lower layers of the dissolving device; each of the upper, middle, and lower density sensors contains a plurality of density sensors; the plurality of density sensors are arranged at equal intervals from top to bottom and are uniformly distributed along the circumferential direction of the inner wall of the dissolving device.

[0023] Furthermore, the liquid raw material unit also includes:

[0024] A density sensor array, located inside the liquid storage tank and electrically connected to the control unit, is configured to collect the density of the solution inside the liquid storage tank.

[0025] A liquid raw material level gauge is installed inside the storage tank and is electrically connected to the control unit.

[0026] Furthermore, the density sensor group includes an upper density sensor, a middle density sensor, and a lower density sensor correspondingly arranged at the upper, middle, and lower layers of the liquid storage tank; each of the upper, middle, and lower density sensors contains a plurality of density sensors; the plurality of density sensors are arranged at equal intervals from top to bottom and are evenly distributed along the circumferential direction of the inner wall of the liquid storage tank.

[0027] Furthermore, the finished product preparation unit includes:

[0028] The finished product reactor, electrically connected to the control unit, is configured to mix the mother liquor with liquid raw materials to form the liquid fertilizer;

[0029] The mother liquor feeding device is connected at one end to the outlet of the dissolving device and at the other end to the mother liquor inlet of the finished product reactor, and is electrically connected to the control unit.

[0030] A liquid raw material feeding device includes a liquid raw material pump; the liquid raw material pump has an inlet connected to the outlet of the storage tank, and an outlet connected to the return port of the storage tank and the liquid raw material inlet of the finished product reactor, and is electrically connected to the control unit.

[0031] Furthermore, the finished product discharge unit is connected at one end to the discharge port of the finished product reactor and at the other end to a transport vehicle, and includes a filter, a finished product discharge pump, and a finished product flow meter connected in sequence according to the liquid fertilizer conveying direction; the finished product discharge pump and the finished product flow meter are both electrically connected to the control unit.

[0032] Compared with the prior art, the technical effects achieved by this utility model are as follows:

[0033] 1. Setting up an independent mother liquor preparation unit allows solid raw materials to be dissolved into mother liquor in advance for later use, thus coordinating time, shortening the production cycle, and providing favorable conditions for large-scale agricultural fertilizer use;

[0034] 2. Several sets of mother liquor preparation units are set up to dissolve different solid raw materials separately into mother liquors with different components. This enables precise control of raw material input, prevents reactions between different raw materials, facilitates individual control of the content of different components of mother liquor, and further shortens the production cycle, providing favorable conditions for quality control of finished liquid fertilizer.

[0035] 3. Setting up several independent liquid raw material units enables precise control of the addition of liquid raw materials of different components, facilitates individual control of the addition amount of liquid raw materials of different components, further shortens the production cycle, and provides favorable conditions for quality control of finished liquid fertilizer.

[0036] 4. The system is equipped with a control unit, which enables automated control of the liquid fertilizer production system, achieving precise quality control and overall management of the production process;

[0037] 5. The large-scale liquid fertilizer production system proposed in this utility model achieves the pre-preparation of mother liquor by setting up independent mother liquor preparation units and liquid raw material units. Then, the mother liquor and stored liquid raw materials are put into the reaction vessel for liquid-liquid mixing, which can quickly obtain a finished liquid fertilizer in a uniform and balanced state. It solves the problems of long production cycle, frequent quality problems, mutual reaction between different raw materials, inaccurate feed amount, unstable component content, and inability to provide timely feedback on testing cycle in the existing liquid fertilizer production process, and provides an innovative model that can be used for reference in large-scale agricultural production. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of a large-scale liquid fertilizer production system for liquid-liquid mixing according to an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the mother liquor preparation unit structure of a large-scale liquid fertilizer production system for liquid-liquid mixing according to an embodiment of the present invention.

[0040] Figure 3 This is a schematic diagram of the density sensor group arrangement structure of a large-scale liquid fertilizer production system for liquid-liquid mixing according to an embodiment of the present invention, wherein... Figure 3 A is a top view of the dissolving apparatus, where Figure 3 B is the dissolving device AA ， A sectional view, in which Figure 3 C is a top view of the dissolving apparatus rotated 180°, where Figure 3 D is the dissolving device BB ， A sectional view;

[0041] Figure 4 This is a schematic diagram of the liquid raw material unit structure of a large-scale liquid-liquid mixing liquid fertilizer production system according to an embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of the finished product preparation unit structure of a large-scale liquid fertilizer production system for liquid-liquid mixing according to an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the finished product discharge unit of a large-scale liquid fertilizer production system based on an embodiment of the present invention.

[0044] Explanation of key figure labels:

[0045] 1-Mother liquor preparation unit, 101-Dissolving device, 1011-Stirring drive unit, 1012-Stirring unit, 1013-Upper layer density sensor, 1014-Middle layer density sensor, 1015-Lower layer density sensor, 1016-Temperature sensor, 102-Feeding device, 103-Conveying device, 104-Water supply device, 1041-Water storage tank, 1042-Water level gauge, 1043-Water pump, 1044-Water flow meter, 1045-Inlet pump, 105-Density sensor group, 106-Density sensor, 2-Liquid raw material unit, 201-Storage liquid Tank, 2011-Return Pipe, 2012-Return Port, 202-Liquid Raw Material Level Gauge, 203-Exhaust Device, 3-Finished Product Preparation Unit, 301-Finished Product Reactor, 302-Mother Liquor Feeding Device, 3021-Mother Liquor Pump, 3022-Mother Liquor Flow Meter, 3023-Mother Liquor Feeding Valve, 303-Liquid Raw Material Feeding Device, 3031-Liquid Raw Material Pump, 3032-Liquid Raw Material Flow Meter, 3033-Liquid Raw Material Feeding Valve, 4-Finished Product Discharge Unit, 401-Filter, 402-Finished Product Discharge Pump, 403-Finished Product Flow Meter, 5-Control Unit. Detailed Implementation

[0046] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0047] It should be noted that when a component is referred to as "fixed to," "placed," "equipped with," "provided with," "arranged on," or "connected to" another component, it can be directly on the other component or may have an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may have an intervening component present.

[0048] The technical solution of this utility model is illustrated below through specific embodiments. It should be understood that the one or more steps mentioned in this utility model do not preclude the existence of other methods and steps before or after the combined steps, or that other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of this utility model. Unless otherwise stated, the numbering of each method step is only for the purpose of identifying each method step, and not for limiting the order of each method or defining the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantial changes to the technical content, can also be considered as within the scope of implementation of this utility model.

[0049] The raw materials and instruments used in the examples are not subject to any specific restrictions on their source; they can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0050] Please refer to Figures 1 to 6 The contents are shown to better understand the specific structure of this utility model. A large-scale liquid fertilizer production system for liquid-liquid mixing, such as... Figure 1 As shown, it includes:

[0051] Several sets of mother liquor preparation units 1, including a tank-shaped dissolving device 101, are configured to dissolve solid raw materials to form mother liquor;

[0052] Several sets of liquid raw material units 2, including liquid storage tanks 201, are configured to store liquid raw materials;

[0053] The finished product preparation unit 3 is connected to the mother liquor preparation unit 1 and the liquid raw material unit 2 respectively, and is configured to mix the mother liquor and liquid raw materials to form the finished liquid fertilizer;

[0054] The finished product discharge unit 4 is connected to the finished product preparation unit 3 and is configured to transport the liquid fertilizer to the planting area.

[0055] The control unit 5 is electrically connected to the liquid raw material unit 2, the finished product preparation unit 3, and several sets of mother liquor preparation units 1, and is configured to control the operation of the liquid fertilizer production system.

[0056] It should be noted that in existing technologies, large-scale farms use on-site liquid fertilizer preparation equipment. The equipment used is a reactor, which is expensive, and to save costs, only one set is typically installed. During production, multiple solid and liquid raw materials are directly added to the reactor for mixing. In this process, multiple solid raw materials are fed through the same conveyor line, which can easily cause reactions between different materials on the conveyor line, affecting the composition of the finished liquid fertilizer. Therefore, the conveyor line needs constant manual cleaning, which is time-consuming, labor-intensive, and ineffective. The production system provided by this invention sets up multiple independent mother liquor preparation units 1 (the number can be set according to production output requirements, typically a dozen to several dozen sets). Each or several mother liquor preparation units 1 are only responsible for dissolving the same solid raw material and preparing the mother liquor, thus avoiding reactions between different raw materials and reducing the drawbacks of manual cleaning.

[0057] It should be noted that in the existing technology, the liquid fertilizer production process requires first dissolving solid raw materials in a reactor, and then mixing liquid raw materials in the reactor to form liquid fertilizer. Complete dissolution of solid raw materials takes a relatively long time (approximately 1-7 hours). Since there is only one reactor, this severely hinders production, especially during peak fertilizer demand periods, when one reactor is simply insufficient. Multiple reactors must be used, which undoubtedly increases production costs. The production system provided by this invention separates the solid raw material dissolution process independently, utilizing multiple low-cost dissolution devices 101 (preferably plastic tank structures; the liquid raw material unit's storage tank can also use the same material) to dissolve different solid raw materials into mother liquor. By pre-preparing mother liquors of different compositions for later use, the demand for mother liquor during peak periods can be met. This technical solution effectively manages time, greatly reduces downtime, and shortens the production cycle.

[0058] It should be noted that in existing technologies, multiple solid and liquid raw materials are added to the reactor for mixing, and the quantity ratio control is extremely rough. The quality of the finished liquid fertilizer is difficult to control. Due to the long feedback cycle for testing, the liquid fertilizer that has been put into use may not meet the usage standards, thus affecting crop growth. The production system provided by this utility model stores, transports, and adds solid and liquid raw materials of different components independently. Therefore, by controlling the operation of each mother liquor preparation unit 1 and liquid raw material unit 2 separately, the input amount of each raw material can be precisely controlled, and fine-tuning can be made as needed to meet the growth needs of different crops at different stages. This can effectively improve the quality control of the finished product and finally obtain liquid fertilizer that meets the requirements.

[0059] It should be noted that solid raw materials include, but are not limited to, potassium chloride powder, potassium nitrate powder, potassium sulfate powder, urea, monoammonium phosphate powder, diammonium phosphate powder, potassium dihydrogen phosphate powder, ammonium sulfate powder, and ammonium chloride powder; liquid raw materials include, but are not limited to, UAN (Urea Ammonium Nitrate solution), liquid APP (ammonium polyphosphate), calcium nitrate solution, and magnesium nitrate solution; in the liquid fertilizer production process, the above-mentioned different raw materials can be dissolved and mixed according to the existing technical ratios and combinations to form the finished liquid fertilizer; this utility model does not limit the technical solutions such as the composition and proportion of liquid fertilizer.

[0060] It should be noted that the control unit 5 can be independently installed in the control room of the production system and can be connected to various components via cables or wirelessly. The control unit 5 is preferably a PLC (Programmable Logic Controller), but it can also be a circuit including at least one processor, a circuit including at least one microcontroller, or a combination of multiple circuits or chips, as long as it can achieve the corresponding function. It is understood that for those skilled in the art, the control circuit can also be a common circuit composed of amplifiers, comparators, transistors, MOSFETs, etc., to achieve the corresponding function in a purely hardware manner.

[0061] In specific implementation, setting up an independent mother liquor preparation unit 1 allows for the pre-dissolving of solid raw materials into mother liquor for later use, coordinating time, shortening the production cycle, and providing favorable conditions for large-scale agricultural fertilizer application. Setting up several sets of mother liquor preparation units 1 allows for the separate dissolution of different solid raw materials into mother liquors of different compositions, enabling precise control of raw material input, preventing reactions between different raw materials, facilitating individual control of the content of different components in the mother liquor, and further shortening the production cycle, thus providing favorable conditions for quality control of the finished liquid fertilizer. Setting up several independent liquid raw material units 2 enables precise control of the input of different liquid raw materials, facilitating individual control of the input amount of different liquid raw materials, further shortening the production cycle, and providing favorable conditions for quality control of the finished liquid fertilizer. The system provides favorable conditions for control; the control unit 5 enables automated control of the liquid fertilizer production system, achieving precise quality control and overall management of the production process; the large-scale liquid-liquid mixing liquid fertilizer production system proposed in this utility model achieves the pre-preparation of mother liquor by setting up independent mother liquor preparation unit 1 and liquid raw material unit 2, and then mixing the mother liquor with the stored liquid raw materials in the reaction vessel to quickly obtain a finished liquid fertilizer in a uniform and balanced state; it solves the problems of long production cycle, frequent quality problems, mutual reaction of different raw materials, inaccurate feed amount, unstable component content, and inability to provide timely feedback on detection cycle in the existing liquid fertilizer production process, and provides an innovative model that can be learned from for large-scale agricultural production.

[0062] In the embodiments provided by this utility model, such as Figure 2 As shown, the mother liquor preparation unit 1 further includes:

[0063] The feeding device 102 has a feed inlet at the upper end and a discharge outlet at the lower end; solid raw materials enter the feeding device 102 through the feed inlet.

[0064] The conveying device 103 has one end located at the lower end of the outlet of the feeding device 102 and the other end located at the upper end of the inlet of the dissolving device 101. It is electrically connected to the control unit 5 and is configured to convey solid raw materials from the feeding device 102 to the dissolving device 101.

[0065] And a water supply device 104, one end of which is connected to a water source, and the other end is connected to the inlet of the dissolving device 101 and electrically connected to the control unit 5.

[0066] It should be noted that the feeding device 102 preferably adopts the hopper structure in the prior art, but this utility model does not make any specific limitations.

[0067] It should be noted that the conveying device 103 preferably adopts the screw conveyor, also known as a feeding auger structure, which is not specifically limited in this utility model; the start and stop of the conveying device 103 can be automatically controlled by the control unit 5 through electrical connection.

[0068] It should be noted that the water supply device 104 includes a water storage tank 1041, a water level gauge 1042, a water pump 1043, a water flow meter 1044, and an inlet pump 1045. The water source is usually groundwater or spring water, which is less expensive. The water from the water source is pumped into the water storage tank 1041 by the inlet pump 1045 to exchange heat with the air and raise the temperature of the groundwater. The water level gauge 1042 is electrically connected to the control unit 5 to automatically control the water volume in the water storage tank 1041. The water pump 1043 and the water flow meter 1044 are both electrically connected to the control unit 5 to accurately control the water supply.

[0069] In practice, the water supply device 104 can raise the water temperature to a dozen degrees Celsius (the groundwater temperature is about 8 degrees Celsius) by pumping groundwater into the water storage tank 1041 before it enters the dissolving device 101 to mix with solid raw materials. This saves energy and prevents the dissolving process from absorbing heat, lowering the temperature, and freezing, which would affect the dissolving speed and thus promote production progress.

[0070] In one implementation, such as Figure 2 As shown, the dissolving device 101 includes:

[0071] The stirring drive unit 1011 is electrically connected to the control unit 5;

[0072] The stirring unit 1012 is disposed inside the dissolving device 101, and its power input end is connected to the power output end of the stirring drive unit 1011;

[0073] Density sensor group 105 is disposed inside the dissolving device 101 and electrically connected to the control unit 5, and is configured to collect the density of the solution inside the dissolving device 101;

[0074] A temperature sensor 1016 is disposed inside the dissolving device 101 and electrically connected to the control unit 5, and is configured to collect the temperature of the solution inside the dissolving device 101.

[0075] It should be noted that the stirring drive unit 1011 is preferably a motor, and its start and stop are controlled by the control unit 5, with the output shaft being the power output end.

[0076] It should be noted that the stirring section 1012 is preferably made of a spiral fan blade structure with a drive shaft. The drive shaft is the power input end, which is driven to rotate by the stirring drive section 1011 to accelerate the dissolution rate of solid raw materials.

[0077] It should be noted that the density sensor group 105 includes several density sensors 106. The density sensors are preferably vibrating density sensors from the prior art, based on the principle of resonance. When the fluid being measured flows through a vibrating element (such as a U-tube or tuning fork), its vibration frequency is related to the fluid density. The density is calculated by measuring the frequency change, achieving high accuracy (up to ±0.001 g / cm³). 3 It features fast response and other characteristics, and is suitable for liquids or gases. It is commonly used in the petroleum, chemical and food industries.

[0078] It should be noted that the temperature sensor 1016 is preferably a contact thermocouple temperature sensor 1016 in the prior art, used to collect the internal temperature of the melting device 101 in real time.

[0079] In specific implementation, a stirring drive unit 1011 and a stirring unit 1012 are set up and connected to the control unit 5 to realize automatic control and effectively improve the dissolution rate, providing favorable conditions for large-scale agricultural production; a density sensor group 105 and a temperature sensor 1016 are set up to transmit the collected solution density and internal temperature to the control unit 5 in real time, providing a basis for further operation and providing favorable conditions for achieving precise quality control.

[0080] In the embodiments provided by this utility model, such as Figure 3 As shown, the density sensor group 105 includes an upper density sensor 1013, a middle density sensor 1014, and a lower density sensor 1015, which are arranged correspondingly in the upper, middle, and lower layers of the dissolving device 101. Each of the upper density sensor 1013, the middle density sensor 1014, and the lower density sensor 1015 includes a plurality of density sensors 106. The plurality of density sensors are arranged at equal intervals from top to bottom and are evenly distributed along the circumferential direction of the inner wall of the dissolving device 101.

[0081] It should be noted that in existing technologies, the on-site preparation of liquid fertilizer involves sequentially adding various solid and liquid raw materials to a reaction vessel for mixing. However, the measurement of raw materials is rather crude, especially since solid raw materials are added in whole ton bags. Since raw material manufacturers often have significant weight deviations during packaging, the actual weight of the added raw materials may not match the standard dosage. Furthermore, losses are prone to occur during the feeding and transportation process, leading to frequent quality problems in the finished liquid fertilizer, making it difficult to control. Moreover, the testing cycle for liquid fertilizer after production is long (requiring several days). During peak production periods, the liquid fertilizer has already been used for crop fertilization before the test results are available. Therefore, existing testing methods cannot meet the needs of large-scale farms during peak fertilizer application periods. In this invention, a density sensor 106 and a temperature sensor 1016 are installed in the dissolving device 101 to monitor changes in solution density and temperature in real time, and transmit the collected data to the control unit 5 for comparison. The control unit 5 contains a set of qualified mother liquor reference data for density and temperature (ambient temperature affects mother liquor density; there is a corresponding relationship between the qualified standard mother liquor density and ambient temperature; this correspondence is summarized into a reference table for comparison during production). When the collected data matches the data in the data set, it indicates that the mother liquor quality is qualified (at the corresponding ambient temperature, the mother liquor density and temperature are...). If the density of the mother liquor at the corresponding temperature in the comparison table matches, it indicates that the content of solid raw materials in the mother liquor meets the standard value. If it does not match, the raw materials or production water are added according to the numerical difference for repeated adjustments. The prepared mother liquor and liquid raw materials are then transferred to the reaction vessel for mixing through precise metering (flow meter). The liquid fertilizer produced by this method has its mother liquor quality evaluated and adjusted in real time at the source of preparation. The mother liquor and liquid raw materials are then added to the reaction vessel in proportion through precise transfer. Therefore, compared with the existing technology, a reliable liquid fertilizer can be obtained, and the problem of waste liquid or even adverse effects on crops caused by untimely feedback of test results will not occur.

[0082] It should be noted that the dissolution of solid raw materials is the most time-consuming step in the preparation of liquid fertilizer. This is because the dissolution of solid raw materials is usually an endothermic process, which leads to a drop in solution temperature. Although the production water has already exchanged heat with the environment in the storage tank 1041, and its temperature can usually rise to more than ten degrees Celsius, the liquid temperature may drop by more than ten degrees Celsius, or even fall below 0°C and freeze, due to the endothermic effect during the dissolution process.

[0083] When the solution temperature is too low, the solubility of solid raw materials (i.e., the amount that dissolves in water to reach saturation at a certain temperature) decreases, causing the added raw materials to fail to dissolve further until the water temperature rises. Therefore, in actual production, it is necessary to wait for the solution temperature to rise naturally. In large-scale agricultural applications, the demand for mother liquor is large. If active heating is used to raise the liquid temperature, it will result in high energy costs, significantly increasing the production cost of liquid fertilizer, which is not economically feasible. Currently, the only option is to slowly raise the liquid temperature through environmental heat exchange, which is the main reason for the long dissolution process.

[0084] In existing technologies, to shorten the production cycle, the complete dissolution of solid raw materials is often determined by estimating the time required. However, due to the variety of raw materials and the different amounts added each time, the actual dissolution time varies greatly, which can easily lead to incompletely dissolved raw materials entering subsequent stages, thereby causing quality problems in liquid fertilizers.

[0085] To more accurately determine whether solid raw materials have completely dissolved, this invention innovatively proposes a temperature-based determination method. This method relies on a temperature sensor 1016 to collect solution temperature data in real time. It can be used not only as a reference standard for mother liquor quality inspection but also as a basis for determining whether dissolution is complete. Its theoretical basis lies in the existence of a "saturation dissolution temperature" for solid raw materials in water, which is the temperature at which the solute reaches a dissolution-precipitation equilibrium state (saturation state) in the solvent under specific pressure.

[0086] Taking potassium nitrate powder as an example, at a certain ambient temperature (the temperature of the solvent before dissolution is the same as the ambient temperature), the lowest dissolution temperature at which a certain concentration of potassium nitrate aqueous solution reaches saturation is 8°C. This means that when the solution temperature rises back to 8°C, it indicates that the potassium nitrate has completely dissolved and reached saturation. However, in actual preparation of the mother liquor, the raw material-water ratio used is usually lower than the saturation concentration at normal temperatures. Therefore, at the aforementioned ambient temperature, when the solution temperature rises to 8°C, the added potassium nitrate powder must have completely dissolved, and the solution is not saturated. Based on this fact, it can be reliably determined that under this ratio, if the solution temperature rises back to 8°C after heat exchange with the environment at the aforementioned ambient temperature, it means that the potassium nitrate powder is completely dissolved.

[0087] Based on this principle, this invention accurately determines whether a solid raw material has completely dissolved by comparing the solution temperature collected by the temperature sensor 1016 in real time with the lowest dissolution temperature of various solid raw materials under different ambient temperatures and saturations. The comparison can be performed manually or automatically by the control unit 5.

[0088] It should be noted that the density sensor group 105 preferably uses 9 density sensors 106; there are 3 density sensors 1013 in the upper layer, 1014 in the middle layer, and 1015 in the lower layer, arranged sequentially on the inner walls of the upper, middle, and lower layers of the dissolving device 101; the internal space of the dissolving device 101 can be divided into three parts according to the height direction: upper layer, middle layer, and lower layer. Taking the arrangement of the upper layer density sensor 1013 as an example, the arrangement of the other density sensors is similar: in the upper space of the dissolving device 101, assuming the upper space is 2m high, it is divided into four parts, each 50cm high. The first density sensor is set at 50cm from the top, the second density sensor is set at 1m from the top, and the third density sensor is set at 1.5m from the top. The three sensors are staggered by 120° along the arc surface of the inner wall of the dissolving device 101, forming a spiral upward arrangement; the arrangement of the other layers of sensors is the same. In practice, the interval distance can be adjusted according to the actual height of the dissolving device 101; in addition, the accuracy of the sensor placement has little impact on the measurement results, and the specific installation position can be fine-tuned.

[0089] It should be noted that the density sensors in the dissolving device 101 of the mother liquor preparation unit 1 and the storage tank 201 of the liquid raw material unit 2 are arranged in the same way. The density sensor arrangement scheme provided by this utility model adopts a comprehensive and multi-layered arrangement, which is designed to address the large temperature difference between day and night when the mother liquor is placed, the liquid sedimentation and stratification during the overwintering or long-term storage of the liquid raw materials, and the large volume of the dissolving device 101 and the storage tank 201 (the volume of large-scale farms can usually reach tens of cubic meters), resulting in large density differences inside the containers. In addition, when the dissolving device 101 or the storage tank 201 is placed outdoors, density differences will occur between the sunlit and shady sides due to different sunlight. Therefore, through this comprehensive and multi-layered arrangement, the density values ​​of the solution in various directions can be obtained more accurately, thereby determining whether the solution density is consistent and preventing the quality deviation of the solution transmitted to the reaction vessel due to different densities from causing changes in the quality of the liquid fertilizer. If inconsistencies in density are found, the solution can be stirred again in the dissolving device 101 by the stirring part 1012 to achieve a uniform density. The storage tank 201 is equipped with a return pipe 2011, and the liquid raw material pump 3031 described later returns the liquid raw material at the bottom of the storage tank 201 from the top of the storage tank 201 to the storage tank 201 for impact mixing, thereby achieving a uniform density.

[0090] It should be noted that the individual application and combined use of temperature sensor 1016 and density sensor 106 can achieve several technical effects. First, during the preparation of the mother liquor, the temperature sensor 1016 monitors the solution temperature in real time and compares it with the dissolution saturation temperature of the solid raw material to determine whether the solid raw material has completely dissolved. Second, after determining that the solid raw material has completely dissolved, the density sensor collects the solution density, and the temperature sensor 1016 collects the solution temperature. Comparing these data with the temperature-density relationship table of the solid raw material, it can be determined whether the mother liquor meets the standard at the current temperature. If not, it can be adjusted by adding solid raw material or production water, achieving real-time quality detection of the mother liquor and providing real-time feedback. Third, the arrangement of the density sensors allows for comprehensive detection of liquid raw materials or mother liquor that have been stored for a long time, determining whether stratification or density inhomogeneity has occurred, and enabling real-time remixing and adjustment. The above comparison work can be performed manually or automatically by the control unit 5.

[0091] In practice, the temperature sensor 1016 can determine whether the solid raw material has completely dissolved; the density sensor can determine the uniformity of density inside the container; the combination of the two can enable real-time inspection of the mother liquor quality, providing favorable conditions for large-scale liquid fertilizer production.

[0092] In one implementation, such as Figure 4 As shown, the liquid raw material unit 2 further includes:

[0093] Density sensor group 105 is disposed inside the liquid storage tank 201 and electrically connected to the control unit 5, and is configured to collect the density of the solution in the liquid storage tank 201;

[0094] The liquid raw material level gauge 202 is installed inside the liquid storage tank 201 and is electrically connected to the control unit 5.

[0095] The density sensor group 105 includes an upper density sensor 1013, a middle density sensor 1014, and a lower density sensor 1015, which are correspondingly arranged in the upper, middle, and lower layers of the liquid storage tank 201. Each of the upper density sensor 1013, the middle density sensor 1014, and the lower density sensor 1015 contains a plurality of density sensors. The plurality of density sensors are arranged at equal intervals from top to bottom and are evenly distributed along the circumferential direction of the inner wall of the liquid storage tank 201.

[0096] It should be noted that the density sensor group 105 and the density sensor group 105 of the dissolving device 101 are arranged in the same way. The purpose of both is to collect data in all directions and at multiple levels, and the resulting technical effects are also the same. It will not be elaborated here.

[0097] It should be noted that the liquid raw material level gauge 202 preferably uses the existing contact capacitive level gauge, and is equipped with level gauges at the highest and lowest positions to accurately control the total amount of liquid raw material.

[0098] It should be noted that the upper part of the liquid storage tank 201 is also equipped with an exhaust device 203 for venting the internal gas.

[0099] In the embodiments provided by this utility model, such as Figure 5 As shown, the finished product preparation unit 3 includes:

[0100] The finished product reactor 301 is electrically connected to the control unit 5 and is configured to mix the mother liquor with liquid raw materials to form the liquid fertilizer;

[0101] The mother liquor feeding device 302 is connected at one end to the outlet of the dissolving device 101 and at the other end to the mother liquor inlet of the finished product reactor 301, and is electrically connected to the control unit 5.

[0102] The liquid raw material feeding device 303 includes a liquid raw material pump 3031; the liquid raw material pump 3031 has an inlet connected to the outlet of the storage tank 201, and its outlet is connected to the return port 2012 of the storage tank 201 and the liquid raw material inlet of the finished product reactor 301, and is electrically connected to the control unit 5.

[0103] It should be noted that the reactor is preferably based on the existing structure in the prior art, and reactors of different volumes can be selected according to the specific scale, which is not limited here; the reactor is controlled by the control unit 5 to achieve automated operation.

[0104] It should be noted that the mother liquor feeding device 302 includes:

[0105] The mother liquor pump 3021, which is electrically connected to the control unit 5, is preferably a hydraulic pump structure in the prior art, but is not limited here;

[0106] The mother liquor flow meter 3022, which is electrically connected to the control unit 5, is used to accurately measure the mother liquor flow rate;

[0107] And the mother liquor feed valve 3023, which is electrically connected to the control unit 5;

[0108] The mother liquor flow meter 3022 transmits the monitored mother liquor flow rate to the control unit 5 in real time. When the rated flow rate is reached, the control unit 5 sends a shut-off command to the mother liquor pump 3021 and the mother liquor feed valve 3023.

[0109] It should be noted that the liquid raw material feeding device 303 also includes a liquid raw material flow meter 3032 and a liquid raw material feeding valve 3033, both of which are electrically connected to the control unit 5.

[0110] In practice, the finished product preparation unit 3 can achieve precise control of the feeding of mother liquor and liquid raw materials, providing strong conditions and quality assurance for large-scale agricultural production.

[0111] In one implementation, such as Figure 6 As shown, the finished product discharge unit 4 is connected at one end to the discharge port of the finished product reactor 301 and at the other end to the transport vehicle. It includes a filter 401, a finished product discharge pump 402 and a finished product flow meter 403 connected in sequence according to the liquid fertilizer conveying direction. The finished product discharge pump 402 and the finished product flow meter 403 are both electrically connected to the control unit 5.

[0112] It should be noted that the filter 401, the finished product discharge pump 402, and the finished product flow meter 403 all adopt conventional structures of existing technology, and there are no restrictions here; multiple filters 401 can be installed and arranged in front of or behind the finished product discharge pump 402.

[0113] In practice, the finished product discharge unit 4 can achieve precise control of liquid fertilizer discharge, providing strong conditions and quality assurance for large-scale agricultural production.

[0114] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A liquid fertilizer production system for large scale liquid liquid blending, characterized in that, include: Several sets of mother liquor preparation units, including tank-shaped dissolving devices, are configured to dissolve solid raw materials to form mother liquor; Several sets of liquid raw material units, including storage tanks, are configured to store liquid raw materials; The finished product preparation unit is connected to the mother liquor preparation unit and the liquid raw material unit respectively, and is configured to mix the mother liquor and liquid raw materials to form the finished liquid fertilizer; The finished product discharge unit, connected to the finished product preparation unit, is configured to transport the liquid fertilizer to the planting area. The control unit is electrically connected to the liquid raw material unit, the finished product preparation unit, and several sets of mother liquor preparation units, and is configured to control the operation of the liquid fertilizer production system.

2. The large scale liquid liquid blending liquid fertilizer production system of claim 1, wherein, The mother liquor preparation unit further includes: The feeding device has a feed inlet at the top and a discharge outlet at the bottom; solid raw materials enter the feeding device through the feed inlet. A conveying device, with one end located at the lower end of the discharge port of the feeding device and the other end located at the upper end of the inlet of the dissolving device, is electrically connected to the control unit and is configured to convey solid raw materials from the feeding device to the dissolving device. It also includes a water supply device, one end of which is connected to a water source, and the other end is connected to the inlet of the dissolving device and electrically connected to the control unit.

3. The scaled liquid liquid blending liquid fertilizer production system of claim 1, wherein, The dissolving apparatus includes: The stirring drive unit is electrically connected to the control unit; A stirring unit is disposed inside the dissolving device, and its power input end is connected to the power output end of the stirring drive unit; A density sensor array, located inside the dissolving device and electrically connected to the control unit, is configured to collect the density of the solution within the dissolving device. A temperature sensor is installed inside the dissolving device and electrically connected to the control unit, and is configured to collect the temperature of the solution inside the dissolving device.

4. The large scale liquid liquid blending liquid fertilizer production system of claim 3, wherein, The density sensor group includes an upper density sensor, a middle density sensor, and a lower density sensor, which are arranged correspondingly in the upper, middle, and lower layers of the dissolving device. Each of the upper, middle, and lower density sensors contains a plurality of density sensors. The plurality of density sensors are arranged at equal intervals from top to bottom and are evenly distributed along the circumferential direction of the inner wall of the dissolving device.

5. The scaled liquid liquid blending liquid fertilizer production system of claim 1, wherein, The liquid raw material unit further includes: A density sensor array, located inside the storage tank and electrically connected to the control unit, is configured to collect the density of the solution inside the storage tank. A liquid raw material level gauge is installed inside the storage tank and is electrically connected to the control unit.

6. The scaled liquid liquid blending liquid fertilizer production system of claim 5, wherein, The density sensor group includes an upper density sensor, a middle density sensor, and a lower density sensor, which are arranged correspondingly in the upper, middle, and lower layers of the liquid storage tank. Each of the upper, middle, and lower density sensors contains a plurality of density sensors. The plurality of density sensors are arranged at equal intervals from top to bottom and are evenly distributed along the circumferential direction of the inner wall of the liquid storage tank.

7. The scaled liquid liquid blending liquid fertilizer production system of claim 1, wherein, The finished product preparation unit includes: The finished product reactor, electrically connected to the control unit, is configured to mix the mother liquor with liquid raw materials to form the liquid fertilizer; The mother liquor feeding device is connected at one end to the outlet of the dissolving device and at the other end to the mother liquor inlet of the finished product reactor, and is electrically connected to the control unit. A liquid raw material feeding device includes a liquid raw material pump; the liquid raw material pump has an inlet connected to the outlet of the storage tank, and an outlet connected to the return port of the storage tank and the liquid raw material inlet of the finished product reactor, and is electrically connected to the control unit.

8. The scaled liquid liquid blending liquid fertilizer production system of claim 7, wherein, The finished product discharge unit is connected at one end to the discharge port of the finished product reactor and at the other end to a transport vehicle. It includes a filter, a finished product discharge pump, and a finished product flow meter connected in sequence according to the liquid fertilizer conveying direction. The finished product discharge pump and the finished product flow meter are both electrically connected to the control unit.

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