Fertilization system and fertilization method for organic fertilizer

Abstract

The invention relates to the technical field of organic fertilizer fertilization, and particularly discloses an organic fertilizer fertilization system and a fertilization method.The organic fertilizer fertilization system comprises a differential pressure centrifugal filtering device, the differential pressure centrifugal filtering device comprises a device body, a centrifugal rotating disc is rotatably arranged in the device body, and a plurality of small filtering holes are formed in the middle of the side wall of the centrifugal rotating disc; a refined filtration liquid storage chamber and a slag liquid storage chamber are arranged in the device body; the bottom section cutting surfaces of the refined filtration liquid storage chamber and the slag liquid storage chamber are arranged in a manner that the middle parts are convex; the centrifugal turntable sequentially penetrates through the middle parts of the refined filtration liquid storage chamber and the slag liquid storage chamber; and a feeding pipe is arranged above the centrifugal turntable. The invention discloses an organic fertilizer applying method. The method comprises the following specific steps: S1, coarse filtration; s2, differential pressure fine filtration; s3, diluting; s4, mixing the refined filtration diluted biogas slurry with gas to obtain gas-liquid mixed biogas slurry, and fertilizing crops. The device has the beneficial effects of low energy consumption, high filtering efficiency, application of the treated biogas slurry to a drip irrigation system and the like.

Description

Technical Field

[0001] The invention relates to the technical field of organic fertilizer application, and in particular to an organic fertilizer application system and a fertilization method. Background Art

[0002] Biogas slurry fertilizer is a high-quality organic fertilizer made from human and animal feces, straw and other organic matter after anaerobic fermentation in a biogas digester. Biogas slurry fertilizer can provide comprehensive nutrients for crops, promote the growth and development of crops, and improve the yield and quality of crops. For example, using biogas slurry fertilizer as a topdressing in vegetable planting can make the leaves of vegetables dark green and the stems thick, improving the taste and nutritional value of vegetables. In traditional crop planting, the specific operation method of biogas slurry fertilizer is: it is often applied in trenches or holes, and the biogas slurry fertilizer is applied near the root system of crops, and then covered with soil. However, with the innovation and development of agricultural technology, drip irrigation technology has been widely used in crop planting. Drip irrigation technology has begun to be mainly used for crop water supply, that is, according to the water requirements of crops, water and nutrients required by crops are dripped into the soil of the crop root zone drop by drop evenly and slowly through a pipeline system and an emitter installed on a capillary tube. In order to reduce labor costs, large farms have adopted drip irrigation systems for fertilization, but currently it is mainly based on inorganic fertilizers. After the inorganic fertilizers are effectively dissolved in water, they are transported to the drip irrigation pipeline through a pressure pump to achieve fertilization. Untreated biogas slurry fertilizer has not yet been found to be directly applied to drip irrigation systems due to the large amount of impurities. The applicant has tried to use filter plates for coarse filtration + fine filtration to meet the anti-blocking requirements of the drip irrigation system. However, in actual filtration operations, it was found that the filtration was slow and the efficiency was low, making it difficult to apply to large-scale farms. Summary of the invention

[0003] In view of the above shortcomings, the present invention provides an organic fertilizer fertilization system and a fertilization method to meet the anti-blocking requirements of the existing drip irrigation system and reduce the probability of blockage.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] An organic fertilizer fertilization system comprises a pressure difference centrifugal filtration device, the pressure difference centrifugal filtration device comprises a device body, a centrifugal turntable is rotatably arranged in the device body, the centrifugal turntable is of a structure that is wide at the top and narrow at the bottom, and a plurality of filtering holes are arranged in the middle of its side wall; a driving shaft is arranged at the lower part of the centrifugal turntable, and the driving shaft is driven by a driving motor; a fine filtration liquid storage chamber and a slag liquid storage chamber are arranged in the device body; the bottom cross-sections of the fine filtration liquid storage chamber and the slag liquid storage chamber are both arranged with a central convexity; the centrifugal turntable passes through the middle of the fine filtration liquid storage chamber and the slag liquid storage chamber in turn; a feed pipe is arranged above the centrifugal turntable; the air pressure between the fine filtration liquid storage chamber and the slag liquid storage chamber can be regulated.

[0006] Optionally, a feeding pipe is rotatably provided at the lower portion of the feeding pipe.

[0007] Optionally, the fine filtration liquid storage chamber and the slag liquid storage chamber are both configured as sealed chamber structures; a first sealed bearing is provided between the centrifugal turntable and the bottom of the fine filtration liquid storage chamber; and a second sealed bearing is provided between the centrifugal turntable and the bottom of the slag liquid storage chamber.

[0008] Optionally, the fine filtration liquid storage chamber is connected to a first air pressure regulating pipe, on which a first air valve is provided; the slag liquid storage chamber is connected to a second air pressure regulating pipe, on which a second air pressure regulating pipe is provided.

[0009] Optionally, a first drain pipe is provided at the bottom of the fine filtration liquid storage chamber, and a first valve is provided on the first drain pipe; a second drain pipe is provided at the bottom of the slag liquid storage chamber, and a second valve is provided on the second drain pipe.

[0010] Optionally, the fine filtration liquid storage chamber is connected to a first pressure gauge and a safety valve through a first ventilation tube, and an arc-shaped protective cover is provided at the inner end of the first ventilation tube; the slag liquid storage chamber is connected to a second pressure gauge and a safety valve through a second ventilation tube, and an arc-shaped protective cover is provided at the inner end of the second ventilation tube. Optionally, it also includes a gas-liquid mixing device, which includes a conical body, and a spiral hole is provided in the conical body from top to bottom; the top of the spiral hole is connected to the filtrate inlet pipe and an air inlet pipe is provided along the tangential direction thereof; the lower end of the spiral hole is connected to the mixed gas-liquid delivery pipe.

[0011] Optionally, the spiral radius of the spiral hole gradually increases from top to bottom.

[0012] Optionally, the diameter of the spiral hole gradually decreases from top to bottom.

[0013] An organic fertilizer fertilization method, using the organic fertilizer fertilization system as described above to apply to a drip irrigation system, specifically comprising the following steps:

[0014] S1: coarse filtration, using a coarse filter to coarsely filter the biogas slurry to obtain coarse filtered biogas slurry;

[0015] S2: pressure differential fine filtration, wherein the coarse filtered biogas slurry is transported to the pressure differential centrifugal filtration device through the feed pipe, the fine filtration liquid storage chamber is negatively pressure controlled, and the coarse filtered biogas slurry is centrifuged by a centrifugal turntable and the negative pressure of the fine filtration liquid storage chamber is synchronized to achieve pressure differential centrifugal separation of the coarse filtered biogas slurry to obtain fine filtered biogas slurry;

[0016] S3: diluting the fine filtered biogas slurry with water to obtain fine filtered diluted biogas slurry;

[0017] S4: The fine filtered diluted biogas slurry is input into the gas-liquid mixing device through the filtrate inlet pipe, and positive pressure gas is passed through the gas-liquid mixing device through the air inlet pipe to promote the fine filtered diluted biogas slurry to mix with the gas to obtain gas-liquid mixed biogas slurry; the gas-liquid mixed biogas slurry is pumped into the liquid delivery pipeline of the drip irrigation system to fertilize the crops.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The differential pressure centrifugal filter device of the present invention can directly perform fine filtration operations on coarse filtered biogas slurry by combining centrifugal force and differential pressure without dilution, thereby significantly reducing filtration energy consumption; at the same time, the combined effect of centrifugal force and differential pressure not only improves the fine filtration efficiency, but also enables the use of finer filter holes to meet the fineness requirements of the drip irrigation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0021] Figure 1 It is a schematic structural diagram of the differential pressure centrifugal filter device of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the gas-liquid mixing device of the present invention. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] An organic fertilizer application system includes a pressure difference centrifugal filter device, such as Figure 1As shown, the pressure difference centrifugal filtration device includes a device body 1, in which a centrifugal turntable 21 is rotatably arranged, the centrifugal turntable 21 is of a structure that is wide at the top and narrow at the bottom, and a plurality of filtering holes 22 are arranged in the middle of its side wall. During processing, the aperture can be set according to needs. In this embodiment, the aperture can be preferably less than 1 mm; a driving shaft 12 is arranged at the lower part of the centrifugal turntable 21. In this embodiment, the driving shaft 12 is rollingly supported by two bearings 11, and the bearings 11 are fixed on a support 10. A supporting foot 14 is arranged at the lower part of the support 10; the driving shaft 12 is driven by a driving motor 15; a fine filtration liquid storage chamber 9 and a slag liquid storage chamber 5 are arranged in the device body. The fine filtration liquid storage chamber 9 and the slag liquid storage chamber 5 are both circular, and the bottom cross-section thereof is both convex in the middle. The purpose of such design is to promote the liquid to flow toward the periphery to prevent the liquid after centrifugation from causing resistance to the rotation of the centrifugal turntable 21, that is, the highest liquid level lines of the fine filtration liquid storage chamber 9 and the slag liquid storage chamber 5 are lower than the top of the middle part; the centrifugal turntable 21 passes through the middle of the fine filtration liquid storage chamber 9 and the slag liquid storage chamber 5 in sequence; the effect of such design is to promote the centrifugal turntable 21 to throw the filtrate to be filtered from the filtering holes to the fine filtration liquid storage chamber 9 through centrifugal action, and throw the coarser particle size particles or thick liquid from the top of the centrifugal turntable 21 to the slag liquid storage chamber 5. A feed pipe 23 is arranged above the centrifugal turntable 21. In this embodiment, considering the compactness, the lower part of the feed pipe 23 is rotatably provided with a feed pipe 13, and the diameter of the feed pipe 13 is smaller than the diameter of the feed pipe 23. The advantage of this design is that when the upper part of the centrifugal turntable 21 is under negative pressure, the feed pipe 13 plays a role in increasing the fluid resistance in the tube, and when in use, the feed pipe 13 is immersed below the liquid surface. The smaller diameter and the rotatable nature can improve the stability of the feed pipe 13 under various working conditions. Optionally, the air pressure between the fine filtration storage chamber and the slag liquid storage chamber can be regulated. In this embodiment, the fine filtration storage chamber 9 and the slag liquid storage chamber 5 are both configured as a sealed chamber structure; the following scheme can be preferred: a first sealing bearing 24 is provided between the centrifugal turntable 21 and the bottom of the fine filtration storage chamber 9; a second sealing bearing 4 is provided between the centrifugal turntable 21 and the bottom 6 of the slag liquid storage chamber 5. In this embodiment, Figure 1 As shown, a convex ring 25 is provided at the middle and upper part of the centrifugal turntable 21 , and then the convex ring 25 is rotatably connected to the middle part of the bottom 6 of the slag liquid storage chamber 5 through the second sealing bearing 4 .

[0027] Optionally, the fine filtration liquid storage chamber 9 is connected to a first air pressure regulating pipe 8, on which a first air valve 7 is provided; the slag liquid storage chamber 5 is connected to a second air pressure regulating pipe 2, on which a second air pressure regulating pipe 2 is provided. The function of this design is that it can be adjusted and used as needed. For example, during operation, the outer end side of the first air valve 7 is connected to a negative pressure pipe, and the working negative pressure value of the fine filtration storage chamber 9 is controlled by the first air valve 7 to improve the filtering effect. For example, for the biogas slurry coarse filtrate (that is, without dilution with water), the use of this device can combine centrifugal force + negative pressure to improve the filtering effect; this is also the advantage of this device over the existing filtering system. If the biogas slurry coarse filtrate is diluted and then filtered, for example, the biogas slurry generally needs to be diluted at 1:2 to 1:3 for use on crops, and is only filtered after dilution at 1:2, for large farms, the filtering device will increase the energy consumption by more than double (the total filtration amount increases by 2 times), and the existing filtering device directly filters the biogas slurry coarse filtrate, which is prone to clogging in long-term use (because the drip irrigation system requires a higher liquid fineness, so the biogas slurry must pass through a fine sieve). Therefore, the present device can significantly reduce energy consumption relative to existing equipment and meet the fineness requirements, and remove larger particles and viscous substances by centrifugation. The second air valve 3 can play an auxiliary enhancement role, such as introducing positive pressure air to promote the formation of a flowing airflow from the inner side to the outer side of the centrifugal turntable 21, improve the smoothness of the biogas slurry passing through the filter holes 22, and improve the centrifugal filtration efficiency. When regular maintenance is required, the centrifugal turntable 21 is centrifugally cleaned by introducing clean water, and the outer end side of the first air valve 7 can also be connected to the positive pressure pipe and the outer end side of the second air valve 3 can be connected to the negative pressure pipe to clear the reverse air pressure.

[0028] Optionally, a first drain pipe 16 is provided at the bottom of the fine filtration storage chamber 9, and a first valve is provided on the first drain pipe 16; a second drain pipe 18 is provided at the bottom of the slag liquid storage chamber 5, and a second valve is provided on the second drain pipe.

[0029] Optionally, the fine filtration liquid storage chamber 9 is connected to a first air pressure gauge 17 and a safety valve through a first ventilation tube, and an arc-shaped protective cover is provided at the inner end of the first ventilation tube (to prevent the inner end of the first ventilation tube from being blocked due to centrifugal swing of the biogas slurry); the slag liquid storage chamber 5 is connected to a second air pressure gauge 19 and a safety valve through a second ventilation tube, and an arc-shaped protective cover 20 is provided at the inner end of the second ventilation tube. Optionally, as Figure 2 As shown, it also includes a gas-liquid mixing device, which includes a conical body 26, in which a spiral hole is arranged from top to bottom; the top 27 of the spiral hole is connected to the filtrate inlet pipe 30 and an air inlet pipe 31 is arranged along its tangential direction; the lower end 28 of the spiral hole is connected to the mixed gas-liquid delivery pipe 29.

[0030] Optionally, the spiral radius of the spiral hole gradually increases from top to bottom, and the aperture of the spiral hole gradually decreases from top to bottom. The advantage of this design is that the diluted filtrate is transported to the filtrate inlet pipe 30 through a pipeline by the electric pump 33, and then positive pressure gas is pressed into the tangential direction of the spiral hole by the air pump 32. The spiral radius gradually increases from top to bottom to increase the gas-liquid mixing contact time, while the aperture of the spiral hole gradually decreases from top to bottom, which can improve the gas-liquid mixing effect through pressure.

[0031] An organic fertilizer fertilization method, using the organic fertilizer fertilization system as described above to apply to a drip irrigation system, specifically comprising the following steps:

[0032] S1: coarse filtration, using a coarse filter (preferably 10-20 meshes) to perform coarse filtration on the biogas slurry to obtain coarse filtered biogas slurry; S2: differential pressure fine filtration, conveying the coarse filtered biogas slurry to a differential pressure centrifugal filtration device through a feed pipe, performing negative pressure control on the fine filtration liquid storage chamber, centrifuging the coarse filtered biogas slurry through a centrifugal turntable and synchronizing the negative pressure of the fine filtration liquid storage chamber, achieving differential pressure centrifugal separation of the coarse filtered biogas slurry to obtain fine filtered biogas slurry;

[0033] S3: diluting the fine filtered biogas slurry with water (for example, diluting the fine filtered biogas slurry with water at a ratio of 1:2 or 1:3) to obtain fine filtered diluted biogas slurry;

[0034] S4: The fine filtered diluted biogas slurry is input into the gas-liquid mixing device through the filtrate inlet pipe, and positive pressure gas is passed through the gas-liquid mixing device through the air inlet pipe to promote the fine filtered diluted biogas slurry to mix with the gas to obtain gas-liquid mixed biogas slurry; the gas-liquid mixed biogas slurry is pumped into the liquid delivery pipeline of the drip irrigation system to fertilize the crops. This is one of the core technical points of this application. Through application, it is found that after the positive pressure gas is fully mixed with the fine filtered diluted biogas slurry, it can be passed through the drip irrigation system to significantly reduce the blockage of the drip irrigation system, because during the transmission process of the gas-liquid mixture in the pipeline of the drip irrigation system, the gas in the gas-liquid mixture plays a good stirring role on the biogas slurry, reducing the precipitation of the diluted biogas slurry during the transmission process, and at the dripper, the positive pressure gas bursts out in the form of bubbles, which plays a continuous dredging role on the dripper, significantly reducing the blockage of the dripper.

Claims

1. An organic fertilizer application system, characterized in that: It comprises a pressure differential centrifugal filter device, which comprises a device body, a centrifugal turntable is rotatably arranged in the device body, the centrifugal turntable is of a structure that is wide at the top and narrow at the bottom, and a plurality of filtering holes are arranged in the middle of its side wall; a driving shaft is arranged at the lower part of the centrifugal turntable, and the driving shaft is driven by a driving motor; a fine filtration liquid storage chamber and a slag liquid storage chamber are arranged in the device body; the bottom cross-section surfaces of the fine filtration liquid storage chamber and the slag liquid storage chamber are both convex in the middle; the centrifugal turntable passes through the middle of the fine filtration liquid storage chamber and the slag liquid storage chamber in turn; a feed pipe is arranged above the centrifugal turntable; the air pressure between the fine filtration liquid storage chamber and the slag liquid storage chamber can be regulated.

2. An organic fertilizer fertilization system according to claim 1, characterized in that: A feeding pipe is rotatably arranged at the lower part of the feeding pipe.

3. An organic fertilizer application system according to claim 1, characterized in that: The fine filtration liquid storage chamber and the slag liquid storage chamber are both configured as sealed chamber structures; a first sealed bearing is provided between the centrifugal turntable and the bottom of the fine filtration liquid storage chamber; and a second sealed bearing is provided between the centrifugal turntable and the bottom of the slag liquid storage chamber.

4. An organic fertilizer application system according to claim 1, characterized in that: The fine filtration liquid storage chamber is connected to a first air pressure regulating pipe, on which a first air valve is arranged; the slag liquid storage chamber is connected to a second air pressure regulating pipe, on which a second air pressure regulating pipe is arranged.

5. The organic fertilizer application system according to claim 1, characterized in that: A first liquid drain pipe is arranged at the bottom of the fine filtration liquid storage chamber, and a first valve is arranged on the first liquid drain pipe; a second liquid drain pipe is arranged at the bottom of the slag liquid storage chamber, and a second valve is arranged on the second liquid drain pipe.

6. An organic fertilizer application system according to claim 1, characterized in that: The fine filtration liquid storage chamber is connected to a first pressure gauge and a safety air valve through a first ventilation tube, and an arc-shaped protective cover is provided at the inner end of the first ventilation tube; the slag liquid storage chamber is connected to a second pressure gauge and a safety air valve through a second ventilation tube, and an arc-shaped protective cover is provided at the inner end of the second ventilation tube.

7. An organic fertilizer application system according to claim 1, characterized in that: It also includes a gas-liquid mixing device, which includes a conical body with spiral holes arranged from top to bottom; the top of the spiral hole is connected to the filtrate inlet pipe and an air inlet pipe is arranged along its tangential direction; the lower end of the spiral hole is connected to the mixed gas-liquid delivery pipe.

8. An organic fertilizer application system according to claim 7, characterized in that: The spiral radius of the spiral hole gradually increases from top to bottom.

9. An organic fertilizer application system according to claim 7, characterized in that: The diameter of the spiral hole gradually decreases from top to bottom.

10. A method for applying organic fertilizer, characterized in that: Using an organic fertilizer fertilization system as claimed in any one of claims 1 to 9 in a drip irrigation system, the specific steps include: S1: coarse filtration, using a coarse filter to coarsely filter the biogas slurry to obtain coarse filtered biogas slurry; S2: pressure differential fine filtration, wherein the coarse filtered biogas slurry is transported to the pressure differential centrifugal filtration device through the feed pipe, the fine filtration liquid storage chamber is negatively pressure controlled, and the coarse filtered biogas slurry is centrifuged by a centrifugal turntable and the negative pressure of the fine filtration liquid storage chamber is synchronized to achieve pressure differential centrifugal separation of the coarse filtered biogas slurry to obtain fine filtered biogas slurry; S3: diluting the fine filtered biogas slurry with water to obtain fine filtered diluted biogas slurry; S4: The fine filtered diluted biogas slurry is input into the gas-liquid mixing device through the filtrate inlet pipe, and positive pressure gas is passed through the gas-liquid mixing device through the air inlet pipe to promote the fine filtered diluted biogas slurry to mix with the gas to obtain gas-liquid mixed biogas slurry; the gas-liquid mixed biogas slurry is pumped into the liquid delivery pipeline of the drip irrigation system to fertilize the crops.

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