A method and system for delayed transmission of biogas slurry fertilizer based on volume matching

Abstract

The present invention provides a method and system for delaying the transmission of biogas slurry fertilizer based on volume matching. When preparing biogas slurry fertilizer by inputting materials into a fertilizer mixing device and establishing a delayed transmission as the biogas slurry fertilizer is sequentially transmitted to a slow-release fertilizer device and a fertilizer injection device, based on the balance of the volume of materials input into the fertilizer mixing device within the irrigation time, the volume of biogas slurry fertilizer transmitted from the fertilizer mixing device to the slow-release fertilizer device, the volume of biogas slurry fertilizer transmitted from the slow-release fertilizer device to the fertilizer injection device, and the volume of biogas slurry fertilizer output by the fertilizer injection device, a volume matching of the input and output of the biogas slurry fertilizer is established, and the first liquid level for the slow-release fertilizer device to transmit to the fertilizer injection device and the fertilizer injection device to start outputting biogas slurry fertilizer, and the second liquid level for the fertilizer injection device to stop outputting biogas slurry fertilizer are determined. During the processes of biogas slurry fertilizer mixing, slow release, and injection, it can meet the buffering requirements, reasonably control the input and output flow rates and the start and stop time of the fertilizer injection device for outputting biogas slurry fertilizer, solve the leakage problem caused by the mismatch between the volume of biogas slurry fertilizer output by the fertilizer injection device and the volume of materials input into the fertilizer mixing device, and facilitate the resource utilization of biogas slurry in aquaculture.

Description

Technical Field

[0001] The present invention belongs to the field of biogas slurry irrigation, and particularly relates to a method and system for delayed transmission of biogas slurry fertilization based on volume matching. Background Art

[0002] Although the transformation of the breeding industry to an intensive and large-scale model can bring economic benefits to breeders, there are risks of environmental pollution of livestock and poultry manure in rural areas. The breeding manure water produced is large in volume, strong in smell and rich in nutrients. How to achieve its efficient and safe resource utilization is a major problem faced by the breeding industry and the water-saving irrigation cause. The resource utilization of biogas slurry from breeding should mainly focus on returning it to the field as fertilizer. Irrigating the farmland after mixing biogas slurry with fertilizer is an effective form of low-cost resource utilization of biogas slurry.

[0003] Currently, when transmitting biogas slurry fertilization, a fertilization device is used to mix materials such as biogas slurry, water, and / or supplementary fertilizer regulators into biogas slurry fertilizer. The discharge port of the fertilization device is connected to the fertilizer injection device for supplying fertilizer. The fertilizer injection device is used for irrigating and supplying biogas slurry fertilizer. Its main defects are as follows: When fertilizing and supplying fertilizer for parallel irrigation, due to the lack of buffering capacity, the chemical properties of the biogas slurry fertilizer are not stable after acid-base adjustment during fertilization, which is likely to affect the irrigation effect. Moreover, during fertilization, the kinetic energy of the biogas slurry fertilizer input into the fertilizer injection device is relatively large after stirring and mixing, resulting in unstable opening and closing control of the fertilizer injection device based on the liquid level. At the same time, the volume of biogas slurry fertilizer output by the fertilizer injection device does not match the volume of materials input into the fertilization device, which is likely to cause the accumulation and overflow of excess biogas slurry fertilizer in the fertilization device, resulting in leakage risks and resource waste.

[0004] Secondly, when the communication structure between the fertilization device and the fertilizer injection device is blocked, the fertilizer storage capacity of the fertilization device cannot meet the demand, resulting in the accumulation and overflow of biogas slurry fertilizer in the fertilization device during the time required for the overall automatic stop of the device.

[0005] Therefore, it is necessary to develop a method and system for biogas slurry fertilization transmission that can buffer, prevent overflow, and is low-cost, which can perform fertilization transmission safely, stably, and without leakage, and is conducive to the resource utilization of biogas slurry from breeding. Summary of the Invention

[0006] The present invention aims to solve at least one of the above technical problems to some extent. The present invention provides a method and system for delayed transmission of biogas slurry fertilization based on volume matching, which can achieve safe, stable, and leak-free fertilization transmission of biogas slurry from breeding when fertilizing and supplying fertilizer for parallel irrigation.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] A method for delayed transmission of biogas slurry fertilization based on volume matching, the method includes:

[0009] Input materials into the fertilizer mixing device to prepare biogas slurry fertilizer, and the biogas slurry fertilizer is sequentially transmitted to the slow-release fertilizer device and the fertilizer injection device;

[0010] When the biogas slurry fertilizer in the slow-release fertilizer device reaches the first liquid level, the slow-release fertilizer device transmits the biogas slurry fertilizer to the fertilizer injection device;

[0011] When the biogas slurry fertilizer in the fertilizer injection device reaches the first liquid level, the fertilizer injection device starts to output the biogas slurry fertilizer;

[0012] When the biogas slurry fertilizer in the fertilizer injection device reaches the second liquid level, the fertilizer injection device stops outputting the biogas slurry fertilizer;

[0013] Obtain the irrigation volume of the biogas slurry fertilizer and the output speed of the biogas slurry fertilizer of the fertilizer injection device, and determine the irrigation time based on this;

[0014] Obtain the buffer time of the biogas slurry fertilizer. Based on the balance of the volume of materials input into the fertilizer mixing device, the volume of biogas slurry fertilizer transmitted from the fertilizer mixing device to the slow-release fertilizer device, the volume of biogas slurry fertilizer transmitted from the slow-release fertilizer device to the fertilizer injection device, and the volume of biogas slurry fertilizer output by the fertilizer injection device during the irrigation time, and the buffer time of the biogas slurry fertilizer is consistent with the time when the biogas slurry fertilizer in the slow-release fertilizer device reaches the first liquid level, determine the first liquid level and the second liquid level.

[0015] Furthermore, obtain the cross-sectional areas of the fertilizer mixing device, the slow-release fertilizer device, and the fertilizer injection device, the fertilizer mixing cycle of the fertilizer mixing device during the irrigation time, the biogas slurry input speed, the biogas slurry input time, the clean water input speed, and the clean water input time during the fertilizer mixing cycle, and determine the first liquid level and the second liquid level based on this.

[0016] Furthermore, the interiors of the fertilizer mixing device, the slow-release fertilizer device, and the fertilizer injection device are all rectangular structures with the same width.

[0017] Furthermore, when the biogas slurry fertilizer in the fertilizer mixing device reaches the third liquid level, the fertilizer mixing device transmits the biogas slurry fertilizer to the slow-release fertilizer device;

[0018] Based on the volume of biogas slurry fertilizer transmitted from the slow-release fertilizer device to the fertilizer injection device during the time when the biogas slurry fertilizer in the fertilizer injection device drops from the first liquid level to the second liquid level, which is consistent with the volume of biogas slurry fertilizer in the slow-release fertilizer device dropping from the third liquid level to the first liquid level, determine the third liquid level.

[0019] Furthermore, based on the volume of biogas slurry fertilizer transmitted from the fertilizer mixing device to the slow-release fertilizer device during the time when the biogas slurry fertilizer in the fertilizer injection device drops from the first liquid level to the second liquid level, which is consistent with the volume of biogas slurry fertilizer in the fertilizer mixing device dropping from the top inside the fertilizer mixing device to the third liquid level, determine the internal height of the fertilizer mixing device.

[0020] A delayed transmission system for biogas slurry fertilization based on volume matching, comprising a control system and the fertilization device, slow-fertilization device, and fertilizer injection device described in any one of the above, wherein the slow-fertilization device is provided with a secondary communication pipe extending to the fertilizer injection device at a first liquid level, the fertilizer injection device is provided with a first monitoring sensor, a second monitoring sensor, and a fertilizer outlet, the first monitoring sensor is used to monitor the first liquid level, the second monitoring sensor is used to monitor the second liquid level, and the control system is connected to the first monitoring sensor and the second monitoring sensor for controlling the opening and closing of the fertilizer outlet.

[0021] Further, the fertilization device is provided with a primary communication pipe extending to the inner bottom of the slow-fertilization device.

[0022] Further, the fertilization device is provided with a fertilization monitoring sensor and a feed inlet, and the control system is connected to the fertilization detection sensor for controlling the opening and closing of the feed inlet.

[0023] Further, a pneumatic stirrer is provided inside the fertilization device.

[0024] Further, sewage pipes are provided at the lower parts of the fertilization device, the slow-fertilization device, and the fertilizer injection device, and sewage valves are provided on the sewage pipes.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) A delayed transmission is established by the fertilization device that completes the mixing of biogas slurry fertilizer, the slow-fertilization tank that completes the buffering of biogas slurry fertilizer, and the fertilizer injection device that realizes the storage and injection of biogas slurry fertilizer to meet the buffering requirements. In the processes of biogas slurry fertilization, slow-fertilization, and fertilizer injection, based on the volume balance of the materials input into the fertilization device within the irrigation time, the volume of biogas slurry fertilizer transmitted from the fertilization device to the slow-fertilization device, the volume of biogas slurry fertilizer transmitted from the slow-fertilization device to the fertilizer injection device, and the volume of biogas slurry fertilizer output by the fertilizer injection device, a volume matching of the biogas slurry fertilizer in and out is established to determine the first liquid level and the second liquid level. When fertilization and fertilizer supply are carried out in parallel for irrigation, the input and output flow rates and the start and stop time of the biogas slurry fertilizer output by the fertilizer injection device are reasonably controlled to solve the leakage problem caused by the mismatch between the volume of the biogas slurry fertilizer output by the fertilizer injection device and the volume of the materials input into the fertilization device, which is conducive to the resource utilization of biogas slurry in aquaculture.

[0027] (2) By reasonably configuring the primary communication pipe and the secondary communication pipe, a liquid level drop with gradually decreasing heights is formed by the third liquid level, the first liquid level, and the second liquid level to constitute a delayed transmission of biogas slurry fertilizer between different structures, further improving the buffering performance and realizing a low-cost transmission of biogas slurry fertilization.

[0028] (3) When the transfer from the slow fertilizer device to the fertilizer injection device is blocked, a volume matching is established based on the volume of the biogas slurry fertilizer transferred from the slow fertilizer device to the fertilizer injection device during the time when the biogas slurry fertilizer in the fertilizer injection device drops from the first liquid level to the second liquid level, being consistent with the volume of the biogas slurry fertilizer in the slow fertilizer device dropping from the third liquid level to the first liquid level. This can minimize the required fertilizer storage margin volume of the slow fertilizer device and further prevent the risk of overflow.

[0029] (4) When the transfer from the fertilizer mixing device to the slow fertilizer device is blocked, a volume matching is established based on the volume of the biogas slurry fertilizer transferred from the fertilizer mixing device to the slow fertilizer device during the time when the biogas slurry fertilizer in the fertilizer injection device drops from the first liquid level to the second liquid level, being consistent with the volume of the biogas slurry fertilizer in the fertilizer mixing device dropping from the top inside the fertilizer mixing device to the third liquid level. This can minimize the required fertilizer storage margin volume of the fertilizer mixing device and further prevent the risk of overflow. Description of the Drawings

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0031] Figure 1 is a schematic structural diagram of the present invention.

[0032] Reference numerals in the drawings: fertilizer mixing device 1, slow fertilizer device 2, fertilizer injection device 3, clean water inlet pipe 4, biogas slurry inlet pipe 5, fertilizer outlet 6, primary communication pipe 7, secondary communication pipe 8, sewage discharge pipe 9 of the fertilizer mixing device, sewage discharge pipe 10 of the slow fertilizer device, sewage discharge pipe 11 of the fertilizer injection device, main pipe 12, sewage discharge valve 13, first liquid level 14, second liquid level 15, third liquid level 16, fertilizer mixing monitoring sensor 17. Detailed Embodiments

[0033] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meanings of "a plurality" and "several" are two or more, unless otherwise specifically and clearly defined.

[0035] In the present invention, unless otherwise clearly specified and defined, the terms "mount", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiment 1:

[0037] This is a preferred embodiment of the method for delayed transmission of biogas slurry fertilization based on volume matching according to the present invention. The method includes: inputting materials into the fertilization device 1 to prepare biogas slurry fertilizer, and the biogas slurry fertilizer is sequentially transmitted to the slow-release fertilizer device 2 and the fertilizer injection device 3;

[0038] When the biogas slurry fertilizer in the slow-release fertilizer device 2 reaches the first liquid level 14, the slow-release fertilizer device 2 transmits the biogas slurry fertilizer to the fertilizer injection device 3;

[0039] When the biogas slurry fertilizer in the fertilizer injection device 3 reaches the first liquid level 14, the fertilizer injection device 3 starts to output the biogas slurry fertilizer;

[0040] When the biogas slurry fertilizer in the fertilizer injection device 3 reaches the second liquid level 15, the fertilizer injection device 3 stops outputting the biogas slurry fertilizer;

[0041] Obtain the irrigation amount of the biogas slurry fertilizer and the output speed of the biogas slurry fertilizer of the fertilizer injection device 3, and determine the irrigation time based on this;

[0042] Obtain the buffer time of the biogas slurry fertilizer. Based on the balance of the material volume input into the fertilizer mixing device 1 during the irrigation time, the volume of biogas slurry fertilizer transferred from the fertilizer mixing device 1 to the slow-release fertilizer device 2, the volume of biogas slurry fertilizer transferred from the slow-release fertilizer device 2 to the fertilizer injection device 3, and the volume of biogas slurry fertilizer output by the fertilizer injection device 3, the buffer time of the biogas slurry fertilizer is consistent with the time when the biogas slurry fertilizer in the slow-release fertilizer device 2 reaches the first liquid level 14, and determine the first liquid level 14 and the second liquid level 15.

[0043] It is possible to establish a volume matching of the biogas slurry fertilizer input and output based on the balance of the material volume input into the fertilizer mixing device 1 during the irrigation time, the volume of biogas slurry fertilizer transferred from the fertilizer mixing device 1 to the slow-release fertilizer device 2, the volume of biogas slurry fertilizer transferred from the slow-release fertilizer device 2 to the fertilizer injection device 3, and the volume of biogas slurry fertilizer output by the fertilizer injection device 3, and determine the distance between the first liquid level 14 and the second liquid level 15; furthermore, based on the fact that the buffer time of the biogas slurry fertilizer is consistent with the time when the biogas slurry fertilizer in the slow-release fertilizer device 2 reaches the first liquid level 14, determine the positions of the first liquid level 14 and the second liquid level 15; by establishing a delayed transmission of the biogas slurry fertilizer between the fertilizer mixing device 1 and the fertilizer injection device 3 through the slow-release fertilizer device 2 to meet the buffer requirements, it can promote the stability of the chemical properties of the biogas slurry fertilizer after fertilization, reduce the impact of the fertilization kinetic energy on the liquid level fluctuation of the biogas slurry fertilizer in the fertilizer injection device 3, stably control the opening and closing output of the biogas slurry fertilizer, and at the same time, in the process of biogas slurry fertilization, slow-release fertilization and fertilizer injection, by determining the first liquid level 14 and the second liquid level 15, the start and stop times of the biogas slurry fertilizer output by the fertilizer injection device 3 can be reasonably controlled based on volume matching, thereby preventing the mismatch between the volume of the biogas slurry fertilizer output by the fertilizer injection device 3 and the volume of the material input into the fertilizer mixing device 1, and avoiding the accumulation and overflow of excess biogas slurry fertilizer in the fertilizer mixing device 1.

[0044] Furthermore, obtain the cross-sectional areas of the fertilizer mixing device 1, the slow-release fertilizer device 2, and the fertilizer injection device 3, the fertilization cycle of the fertilizer mixing device 1 during the irrigation time, the biogas slurry input speed, the biogas slurry input time, the fresh water input speed, and the fresh water input time within the fertilization cycle, and determine the first liquid level 14 and the second liquid level 15 based on this.

[0045] Since the supplementary fertilizer is a regulator for biogas slurry fertilization, relatively speaking, the volumes of biogas slurry and fresh water are much larger than that of the supplementary fertilizer. Therefore, in approximate calculations, only consider the impact of the input of biogas slurry, fresh water and the output of biogas slurry fertilizer on the structural design. The number of fertilization cycles within the irrigation time can be obtained from the irrigation time and the fertilization cycle. Based on the number of fertilization cycles and the biogas slurry input speed, the biogas slurry input time, the fresh water input speed, and the fresh water input time within the fertilization cycle of the fertilizer mixing device 1, the material volume input into the fertilizer mixing device 1 during the irrigation time can be further obtained, which can make the output flow rates of biogas slurry, fresh water and biogas slurry fertilizer match, and further simplify the method.

[0046] Furthermore, the interiors of the fertilizer mixing device 1, the slow-release fertilizer device 2, and the fertilizer injection device 3 are all of cuboid structure and have the same width. The cross-sectional area can be obtained by obtaining the width and length of the fertilizer mixing device 1, the slow-release fertilizer device 2, and the fertilizer injection device 3, further simplifying the volume matching method.

[0047] Further, when the biogas slurry fertilizer in the fertilizer blending device 1 reaches the third liquid level 16, the fertilizer blending device 1 transfers the biogas slurry fertilizer to the slow-release fertilizer device 2;

[0048] According to the volume of the biogas slurry fertilizer transferred from the slow-release fertilizer device 2 to the fertilizer injection device 3 within the time when the biogas slurry fertilizer in the fertilizer injection device 3 drops from the first liquid level 14 to the second liquid level 15, which is consistent with the volume of the biogas slurry fertilizer in the slow-release fertilizer device 2 dropping from the third liquid level 16 to the first liquid level 14, the third liquid level 16 is determined.

[0049] The liquid level drops with decreasing heights formed by the third liquid level 16, the first liquid level 14, and the second liquid level 15 can constitute a time-delay transmission of the biogas slurry fertilizer among the three different structures of the fertilizer blending device 1, the slow-release fertilizer device 2, and the fertilizer injection device 3, further simplifying the transmission.

[0050] The fertilizer blending device 1 and the fertilizer injection device 3 can be provided with a forced shutdown mechanism in case of transmission blockage. When the transmission from the slow-release fertilizer device 2 to the fertilizer injection device 3 is blocked, the time when the biogas slurry fertilizer in the fertilizer injection device 3 drops from the first liquid level 14 to the second liquid level 15 is used as the time required for the fertilizer injection device 3 to automatically stop running. Based on the volume of the biogas slurry fertilizer transferred from the slow-release fertilizer device 2 to the fertilizer injection device 3 within this time, which is consistent with the volume of the biogas slurry fertilizer in the slow-release fertilizer device 2 dropping from the third liquid level 16 to the first liquid level 14, the storage capacity volume of the slow-release fertilizer device 2 can be minimized when the biogas slurry fertilizer accumulates in the slow-release fertilizer device 2 without overflowing, further preventing the risk of overflow.

[0051] Further, according to the volume of the biogas slurry fertilizer transferred from the fertilizer blending device 1 to the slow-release fertilizer device 2 within the time when the biogas slurry fertilizer in the fertilizer injection device 3 drops from the first liquid level 14 to the second liquid level 15, which is consistent with the volume of the biogas slurry fertilizer in the fertilizer blending device 1 dropping from the top inside the fertilizer blending device 1 to the third liquid level 16, the internal height of the fertilizer blending device 1 is determined.

[0052] When the transmission from the fertilizer blending device 1 to the slow-release fertilizer device 2 is blocked, the time when the biogas slurry fertilizer in the fertilizer injection device 3 drops from the first liquid level 14 to the second liquid level 15 is used as the time required for the fertilizer injection device 3 to automatically stop running. Based on the volume of the biogas slurry fertilizer transferred from the fertilizer blending device 1 to the slow-release fertilizer device 2 within this time, which is consistent with the volume of the biogas slurry fertilizer in the fertilizer blending device 1 dropping from the top inside the fertilizer blending device 1 to the third liquid level 16, the storage capacity volume of the fertilizer blending device 1 can be minimized when the biogas slurry fertilizer accumulates in the fertilizer blending device 1 without overflowing, further preventing the risk of overflow.

[0053] Example 2:

[0054] A delayed transmission system for biogas slurry fertilization based on volume matching, including a control system and a fertilization device 1, a slow-fertilization device 2, and a fertilizer injection device 3 as described in Embodiment 1. The slow-fertilization device 2 is provided with a secondary communication pipe 8 extending to the fertilizer injection device 3 at the first liquid level 14. The fertilizer injection device 3 is provided with a first monitoring sensor, a second monitoring sensor, and a fertilizer outlet 6. The first monitoring sensor is used to monitor the first liquid level 14, and the second monitoring sensor is used to monitor the second liquid level 15. The control system is connected to the first monitoring sensor and the second monitoring sensor for controlling the opening and closing of the fertilizer outlet 6.

[0055] Further, the fertilization device 1 is provided with a primary communication pipe 7 extending to the inner bottom of the slow-fertilization device 2. The inlet of the primary communication pipe 7 can be set at the third liquid level 16. The biogas slurry fertilizer slowly rises from the bottom of the slow-fertilization device 2 along the primary communication pipe 7, and the time to reach the first liquid level 14 is consistent with the buffering time of the biogas slurry fertilizer. Through this process, the full buffering of the biogas slurry fertilizer is further promoted.

[0056] Further, the fertilization device 1 is provided with a fertilization monitoring sensor 17 and a feed inlet. The control system is connected to the fertilization detection sensor for controlling the opening and closing of the feed inlet. The feed inlet can be connected to a clean water inlet pipe 4 and a biogas slurry inlet pipe 5. When the biogas slurry fertilizer reaches the monitoring liquid level of the liquid level monitoring sensor of the fertilization device 1, the feed inlet can be controlled to stop, further preventing the overflow of the biogas slurry fertilizer.

[0057] Further, a pneumatic stirrer is provided inside the fertilization device 1 to further strengthen the mixing of the biogas slurry fertilizer through pneumatic stirring.

[0058] Further, the lower parts of the fertilization device 1, the slow-fertilization device 2, and the fertilizer injection device 3 are all provided with drain pipes, and drain valves 13 are provided on the drain pipes. The drain pipes of the fertilization device 1, the slow-fertilization device 2, and the fertilizer injection device 3 can be connected to a main pipe 12, and the drain valve 13 is arranged on the main pipe 12. The drain valve 13 can be manual, and the drain valve 13 can be manually opened for emptying.

[0059] Further, the fertilization device 1 can be selected as a fertilization tank, the slow-fertilization device 2 can be selected as a slow-fertilization tank, and the fertilizer injection device 3 can be selected as a fertilizer injection tank to further simplify the system installation.

[0060] The determination process of the first liquid level 14, the second liquid level 15, the third liquid level 16, and the internal height of the fertilization device 1 of the above system includes:

[0061] S1: Obtain the irrigation amount of the biogas slurry fertilizer and the output speed of the biogas slurry fertilizer of the fertilizer injection device 3, and determine the stable irrigation time based on this. Then there is:

[0062]

[0063] In the above formula (1), t (s) is the irrigation time, V肥 (m 3 ) is the irrigation amount of biogas slurry fertilizer, and Q fertilizer (m 3 / s) is the output speed of biogas slurry fertilizer of the fertilizer injection device 3.

[0064] S2: Obtain the buffer time of biogas slurry fertilizer required for preparing the fertilizer solution, the internal width and length of the fertilizer preparation device 1, the slow fertilizer device 2, and the fertilizer injection device 3. Based on the fact that the buffer time of biogas slurry fertilizer is consistent with the time for the biogas slurry fertilizer in the slow fertilizer device 2 to reach the first liquid level 14 from the bottom of the slow fertilizer device 2, we have:

[0065]

[0066] In the above formula (2), t0 (s) is the buffer time of biogas slurry fertilizer, h4 + h5 (m) is the height of the first liquid level 14 in the slow fertilizer device 2. Numerically, h4 (m) is consistent with the distance between the first liquid level 14 and the second liquid level 15 in the fertilizer injection device 3, h5 (m) is consistent with the height of the second liquid level 15 in the fertilizer injection device 3, W (m) is the internal width of the slow fertilizer device 2, l1 (m) is the internal length of the slow fertilizer device 2, and Q1 (m 3 / s) is the speed of biogas slurry fertilizer transmitted from the fertilizer preparation device 1 to the slow fertilizer device 2.

[0067] S3: Take the start and stop of the fertilizer injection device 3 to output biogas slurry fertilizer as the irrigation time. Based on the balance of the volume of biogas slurry fertilizer transmitted from the slow fertilizer device 2 to the fertilizer injection device 3 and the volume of biogas slurry fertilizer output by the fertilizer injection device 3, we have:

[0068] V 肥 = Q0·t + W·l2·h4 (3)

[0069] In the above formula (3), V 肥 (m 3 ) is the irrigation amount of biogas slurry fertilizer, Q0 (m 3 / s) is the speed of biogas slurry fertilizer transmitted from the slow fertilizer device 2 to the fertilizer injection device 3, t (s) is the irrigation time, W (m) is the internal width of the fertilizer injection device 3, l2 (m) is the internal length of the fertilizer injection device 3, and h4 (m) is the distance between the first liquid level 14 and the second liquid level 15 in the fertilizer injection device 3.

[0070] S4: Obtain the fertilization cycle of the fertilizer preparation device 1 during the irrigation time, the biogas slurry input speed, the biogas slurry input time, the clean water input speed, and the clean water input time during the fertilization cycle. Based on the balance of the volume of biogas slurry fertilizer transmitted from the fertilizer preparation device 1 to the slow fertilizer device 2, the volume of biogas slurry fertilizer transmitted from the slow fertilizer device 2 to the fertilizer injection device 3, and the volume of materials input into the fertilizer preparation device 1 during the irrigation time, we have:

[0071]

[0072] In the above formula, Q0 (m 3 / s) is the speed at which the slow fertilizer device 2 transports biogas slurry fertilizer to the fertilizer injection device 3, Q1 (m 3 / s) is the speed at which the fertilizer mixing device 1 transports biogas slurry fertilizer to the slow fertilizer device 2, t (s) is the irrigation time, Q 沼 (m 3 / s) is the biogas slurry input speed of the fertilizer mixing device, t1 (s) is the biogas slurry input time, Q 清 (m 3 / s) is the clear water input speed of the fertilizer mixing device, t2 (s) is the clear water input time, T (s) is the fertilizer mixing cycle of the fertilizer mixing device 1;

[0073] Combining the above formula with formula (1), we have:

[0074]

[0075] S5: Combining formula (3) and (4) can determine the distance between the first liquid level 14 and the second liquid level 15, then we have:

[0076]

[0077] S6: Combining formula (2) and (5) can determine the height of the second liquid level 15, then we have:

[0078]

[0079]

[0080] Then the height of the first liquid level 14 is h4 + h5 (m), and the positions of the first liquid level 14 and the second liquid level 15 are obtained.

[0081] S7: To meet the fertilizer storage margin requirements of the fertilizer mixing device 1 and the slow fertilizer device 2, the fertilizer storage margin means that when the primary connecting pipe 7 or the secondary connecting pipe 8 is blocked, the system discharges the biogas slurry fertilizer in the fertilizer injection device 3, causing the biogas slurry fertilizer level in the fertilizer injection device 3 to be lower than the second liquid level 15, resulting in the automatic stop of the fertilizer injection device 3. The minimum remaining volume required for the biogas slurry fertilizer to accumulate in the fertilizer mixing device 1 or the slow fertilizer device 2 without overflowing during the required time. Taking the time required for all the fertilizer liquid at the first liquid level 14 and the second liquid level 15 in the fertilizer injection device 3 to be discharged as the maximum time, then we have:

[0082]

[0083] In the above formula (7), t m (s) is the maximum time, Q 肥 (m 3 / s) is the biogas slurry fertilizer output speed of the fertilizer injection device 3, W (m) is the internal width of the fertilizer injection device 3, l2 (m) is the internal length of the fertilizer injection device 3, h4 (m) is the distance between the first liquid level 14 and the second liquid level 15 in the fertilizer injection device 3;

[0084] To minimize the fertilizer storage capacity of the slow-release fertilizer device 2, based on the volume of biogas slurry fertilizer transferred from the slow-release fertilizer device 2 to the fertilizer injection device 3 during the time when the biogas slurry fertilizer in the fertilizer injection device 3 drops from the first liquid level 14 to the second liquid level 15, being consistent with the volume of the biogas slurry fertilizer in the slow-release fertilizer device 2 dropping from the third liquid level 16 to the first liquid level 14, the third liquid level 16 is determined as follows:

[0085] Q0·tm = W·l1·h3 (8)

[0086] In the above formula (8), Q0 (m 3 / s) is the speed of the slow-release fertilizer device 2 transferring biogas slurry fertilizer to the fertilizer injection device 3, t m (s) is the maximum time, W (m) is the internal width of the slow-release fertilizer device 2, l1 (m) is the internal length of the slow-release fertilizer device 2, and h3 (m) is the distance between the third liquid level 16 and the first liquid level 14 in the slow-release fertilizer device 2;

[0087] Combining formula (4) and formula (5), formula (7), formula (8), we get:

[0088]

[0089] Then the height of the third liquid level 16 is h3 + h4 + h5 (m), and the position of the third liquid level 16 is obtained.

[0090] Based on the volume of biogas slurry fertilizer transferred from the fertilizer mixing device 1 to the slow-release fertilizer device 2 during the time when the biogas slurry fertilizer in the fertilizer injection device 3 drops from the first liquid level 14 to the second liquid level 15, being consistent with the volume of the biogas slurry fertilizer in the fertilizer mixing device 1 dropping from the top inside the fertilizer mixing device 1 to the third liquid level 16, the internal height of the fertilizer mixing device 1 is determined as follows:

[0091] Q1·tm = W·l0·h2 (10)

[0092] In the above formula (10), Q1 (m 3 / s) is the speed of the fertilizer mixing device 1 transferring biogas slurry fertilizer to the slow-release fertilizer device 2, t m (s) is the maximum time, W (m) is the internal width of the fertilizer mixing device 1, l0 (m) is the internal length of the fertilizer mixing device 1, and h3 (m) is the distance between the top inside the fertilizer mixing device 1 and the third liquid level 16;

[0093] Combining formula (4), formula (5), formula (7), formula (10), we get:

[0094]

[0095] Then the internal height h1 of the fertilizer mixing device 1 = h2 + h3 + h4 + h5 (m).

[0096] The working principle of the above system is as follows:

[0097] After determining the internal height of the fertilizer mixing device 1 of the first liquid level 14, the second liquid level 15, and the third liquid level 16, the internal volume of the fertilizer mixing device 1, the position of the first connecting pipe 7, the second connecting pipe 8, the first monitoring sensor, and the second monitoring sensor can be reasonably configured; input materials into the fertilizer mixing device 1 to prepare biogas slurry fertilizer. The biogas slurry fertilizer in the fertilizer mixing device 1 is transmitted to the slow-release fertilizer device 2 through the first connecting pipe 7. The biogas slurry fertilizer in the slow-release fertilizer device 2 is transmitted to the fertilizer injection device 3 through the second connecting pipe 8. The first monitoring sensor detects that the liquid level of the biogas slurry fertilizer reaches the first liquid level 14 as the fertilizer injection start signal, controls the fertilizer injection device 3 to start outputting biogas slurry fertilizer for irrigation, and the second monitoring sensor detects that the liquid level of the biogas slurry fertilizer reaches the second liquid level 15 as the fertilizer injection stop signal, controls the fertilizer injection device 3 to stop outputting biogas slurry fertilizer.

[0098] The fertilizer mixing device 1 that completes the mixing of biogas slurry fertilizer, the slow-release fertilizer device 2 that completes the buffering of biogas slurry fertilizer, and the fertilizer injection device 3 that realizes the storage and injection of biogas slurry fertilizer, with their volume matching as a method for anti-overflow design, can achieve safe, stable, and leak-free fertilizer mixing of biogas slurry during parallel irrigation of fertilizer mixing and fertilizer supply.

[0099] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for delayed transmission of biogas slurry-based fertilizer formulation based on volume matching, characterized in that, The method includes: Input materials into the fertilizer blending device (1) to prepare biogas slurry fertilizer, and the biogas slurry fertilizer is sequentially transmitted to the slow-release fertilizer device (2) and the fertilizer injection device (3); When the biogas slurry fertilizer in the slow-release fertilizer device (2) reaches the first liquid level (14), the slow-release fertilizer device (2) transmits the biogas slurry fertilizer to the fertilizer injection device (3); When the biogas slurry fertilizer in the fertilizer injection device (3) reaches the first liquid level (14), the fertilizer injection device (3) starts to output the biogas slurry fertilizer; When the biogas slurry fertilizer in the fertilizer injection device (3) reaches the second liquid level (15), the fertilizer injection device (3) stops outputting the biogas slurry fertilizer; Obtain the irrigation amount of the biogas slurry fertilizer and the output speed of the biogas slurry fertilizer of the fertilizer injection device (3), and determine the irrigation time based on this; Obtain the buffering time of the biogas slurry fertilizer. Based on the balance of the volume of materials input into the fertilizer blending device (1) within the irrigation time, the volume of biogas slurry fertilizer transmitted from the fertilizer blending device (1) to the slow-release fertilizer device (2), the volume of biogas slurry fertilizer transmitted from the slow-release fertilizer device (2) to the fertilizer injection device (3), and the volume of biogas slurry fertilizer output by the fertilizer injection device (3), establish a volume matching of the biogas slurry fertilizer in and out, determine the distance between the first liquid level 14 and the second liquid level 15. The buffering time of the biogas slurry fertilizer is consistent with the time when the biogas slurry fertilizer in the slow-release fertilizer device (2) reaches the first liquid level (14), and determine the first liquid level (14) and the second liquid level (15); Obtain the cross-sectional areas of the fertilizer blending device (1), the slow-release fertilizer device (2), and the fertilizer injection device (3), the fertilizer blending cycle of the fertilizer blending device (1) within the irrigation time, the biogas slurry input speed, the biogas slurry input time, the clean water input speed, and the clean water input time within the fertilizer blending cycle, and determine the first liquid level (14) and the second liquid level (15) based on this.

2. A method for delayed transmission of biogas slurry fertilizer formulation based on volume matching according to claim 1, characterized in that The interiors of the fertilizer blending device (1), the slow-release fertilizer device (2), and the fertilizer injection device (3) are all rectangular structures with the same width.

3. A method for delayed transmission of biogas slurry fertilizer formulation based on volume matching according to claim 1, characterized in that, When the biogas slurry fertilizer in the fertilizer blending device (1) reaches the third liquid level (16), the fertilizer blending device (1) transmits the biogas slurry fertilizer to the slow-release fertilizer device (2); Based on the volume of biogas slurry fertilizer transmitted from the slow-release fertilizer device (2) to the fertilizer injection device (3) within the time when the biogas slurry fertilizer in the fertilizer injection device (3) drops from the first liquid level (14) to the second liquid level (15) being consistent with the volume of the biogas slurry fertilizer in the slow-release fertilizer device (2) dropping from the third liquid level (16) to the first liquid level (14), determine the third liquid level (16).

4. A method for delayed transmission of biogas slurry fertilization based on volume matching according to claim 3, characterized in that, Based on the volume of biogas slurry fertilizer transmitted from the fertilizer blending device (1) to the slow-release fertilizer device (2) within the time when the biogas slurry fertilizer in the fertilizer injection device (3) drops from the first liquid level (14) to the second liquid level (15) being consistent with the volume of the biogas slurry fertilizer in the fertilizer blending device (1) dropping from the top inside the fertilizer blending device (1) to the third liquid level (16), determine the internal height of the fertilizer blending device (1).

5. A biogas slurry fertilization delay transmission system based on volume matching, characterized in that, It includes a control system and a fertilizer blending device (1), a slow-release fertilizer device (2) and a fertilizer injection device (3) as described in any one of claims 1 to 4. The slow-release fertilizer device (2) is provided with a secondary connecting pipe (8) extending to the fertilizer injection device (3) at a first liquid level (14). The fertilizer injection device (3) is provided with a first monitoring sensor, a second monitoring sensor and a fertilizer outlet (6). The first monitoring sensor is used to monitor the first liquid level (14), and the second monitoring sensor is used to monitor the second liquid level (15). The control system is connected to the first monitoring sensor and the second monitoring sensor and is used to control the opening and closing of the fertilizer outlet (6).

6. The delay transmission system for biogas slurry fertilization based on volume matching according to claim 5, characterized in that, The fertilizer blending device (1) is provided with a primary connecting pipe (7) extending to the inner bottom of the slow-release fertilizer device (2).

7. A delay transmission system for biogas slurry fertilization based on volume matching according to claim 5, characterized in that The fertilizer blending device (1) is provided with a fertilizer blending monitoring sensor (17) and a feed inlet. The control system is connected to the fertilizer blending detection sensor and is used to control the opening and closing of the feed inlet.

8. The delay transmission system for biogas slurry fertilization based on volume matching according to claim 5, characterized in that An air-operated mixer is provided inside the fertilizer blending device (1).

9. The delay transmission system for biogas slurry fertilization based on volume matching according to claim 5, wherein The lower parts of the fertilizer blending device (1), the slow-release fertilizer device (2) and the fertilizer injection device (3) are all provided with sewage pipes, and sewage valves (13) are provided on the sewage pipes.

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