Biogas slurry filtering irrigation device

Abstract

The present invention relates to the field of biogas slurry treatment technology, and specifically to a biogas slurry filtering and irrigation device, comprising: a biogas slurry pipeline, one end of which is connected to a biogas slurry tank, and the other end of which is connected to an irrigation pipeline, wherein a plurality of filtering devices are connected in series on the biogas slurry pipeline; a clean water pipeline, one end of which is connected to a clean water tank, and the other end of which is connected to the irrigation pipeline after merging with the end of the biogas slurry pipeline; a first pumping device connected in series upstream of the biogas slurry pipeline; a second pumping device connected in series upstream of the clean water pipeline; a reflux pipeline, one end of which is connected to the end of the biogas slurry pipeline, and the other end of which is connected to the clean water pipeline; the connection point between the reflux pipeline and the biogas slurry pipeline is located downstream of the filtering device, the connection point between the reflux pipeline and the clean water pipeline is located downstream of the second pumping device, and a first valve is provided on the reflux pipeline. The biogas slurry filtering and irrigation device provided by the present invention has the advantages of simple structure, low cost and good filtering effect.

Description

Technical Field

[0001] The invention relates to the technical field of biogas slurry treatment, and in particular to a biogas slurry filtering irrigation device. Background Art

[0002] With the large-scale development of domestic livestock and poultry farming, the treatment of manure and sewage in farms has become a concern of the people. The construction of large and medium-sized biogas projects has found a powerful solution for the treatment of manure and sewage in large-scale farms. It uses farm manure and sewage as fermentation raw materials to obtain clean energy biogas, thereby improving the farm environment and reducing the pressure on the environment. However, at the same time, large and medium-sized biogas projects have produced a large amount of anaerobic residual biogas slurry. If it is not fully and reasonably utilized, the biogas slurry will cause secondary pollution to the environment again, thus restricting the development of large-scale breeding industry.

[0003] The main treatment methods for biogas slurry are direct artificial irrigation and artificial wetland disposal. Both methods are prone to secondary pollution. Using precision irrigation technology and equipment such as drip irrigation for biogas slurry irrigation is an effective way and method for biogas slurry resource utilization. Biogas slurry contains a large amount of organic suspended matter and microorganisms, which can easily breed algae and bacterial groups in the pipeline, causing blockage of pipelines and sprinklers. At present, the relevant filtration equipment available in China cannot meet the requirements of biogas slurry irrigation projects, which also makes it difficult to promote biogas slurry irrigation projects on a large scale.

[0004] In order to solve the problem that biogas slurry irrigation equipment is easily blocked, the Chinese invention patent document with document number CN102527147A discloses a hierarchical filtration and water-gas combined backwashing device for biogas slurry irrigation, including four systems: hierarchical dirt trap, water inlet and liquid inlet, laminated mesh filter group and water-gas combined backwashing. The present invention combines the laminated filter and the mesh filter into a filter group as a dual filtration device for biogas slurry, which can not only improve the filtration efficiency, but also facilitate the implementation of backwashing. Combined with the water-gas combined flushing function, the working efficiency of the device is further improved, and it is not easy to be blocked.

[0005] However, the above technical solution still has shortcomings in actual use, which are as follows: in order to achieve the cleaning of the filter device in the above technical solution, an air compression pump is separately set, and the filter device is reversely flushed using the irrigation water in the air-combined pipeline. The disadvantage of this is that the added air compression pump and its supporting pipelines will make the structure of the irrigation equipment more complicated and the use cost higher; at the same time, when the air is used to reversely flush the pipeline, due to the instability of the air flow rate in the pipeline, the biogas slurry at the sewage outlet is easily splashed, polluting the surrounding environment. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art biogas slurry filtering irrigation device that causes a complicated structure and increased use cost when backwashing, and thus provide a biogas slurry filtering irrigation device with a simpler structure that can perform backwashing.

[0007] To this end, the technical solution provided by the present invention is as follows:

[0008] A biogas slurry filtering irrigation device, comprising:

[0009] A biogas slurry pipeline, one end of which is connected to the biogas slurry tank, and the other end of which is connected to the irrigation pipeline, wherein a plurality of filtering devices are connected in series on the biogas slurry pipeline;

[0010] A clean water pipeline, one end of which is connected to the clean water tank, and the other end of which is connected to the irrigation pipeline after merging with the end of the biogas slurry pipeline;

[0011] A first pumping device is connected in series upstream of the biogas slurry pipeline and is suitable for pumping the biogas slurry from the biogas slurry tank to the biogas slurry pipeline;

[0012] A second pumping device, connected in series upstream of the clean water pipeline, is suitable for pumping clean water from the clean water tank into the clean water pipeline;

[0013] Also includes:

[0014] A reflux pipeline, one end of which is connected to the end of the biogas slurry pipeline, and the other end of which is connected to the clean water pipeline; the connection point between the reflux pipeline and the biogas slurry pipeline is located downstream of the filtering device, and the connection point between the reflux pipeline and the clean water pipeline is located downstream of the second pumping device, and a first valve is arranged on the reflux pipeline.

[0015] As a preferred technical solution, it also includes:

[0016] A second valve is arranged at the end of the biogas slurry pipeline and is located downstream of the connection between the biogas slurry pipeline and the return pipeline;

[0017] The third valve is arranged at the end of the clean water pipeline and is located downstream of the connection point between the clean water pipeline and the reflux pipeline.

[0018] As a preferred technical solution, it also includes:

[0019] The mixing tank is arranged at the junction of the clean water pipeline and the biogas liquid pipeline, and connects the clean water pipeline, the biogas liquid pipeline and the irrigation pipeline.

[0020] As a preferred technical solution, a material injection port is provided on the mixing tank.

[0021] As a preferred technical solution, the filtering device includes a volcanic rock filter, a quartz sand filter, a mesh filter, and a laminated filter which are sequentially connected in series from the biogas pool to the irrigation pipeline.

[0022] As a preferred technical solution, the first pumping device is arranged between the biogas slurry tank and the volcanic rock filter, and is suitable for pumping the biogas slurry in the sedimentation tank into the biogas slurry pipeline.

[0023] As a preferred technical solution, a fourth valve is further provided between the first pumping device and the volcanic rock filter, a first sewage outlet is provided between the volcanic rock filter and the fourth valve, a second sewage outlet is provided between the volcanic rock filter and the quartz sand filter, a third sewage outlet is provided between the quartz sand filter and the mesh filter, a fourth sewage outlet is provided between the mesh filter and the laminated filter, and sewage valves are provided at the first sewage outlet, the second sewage outlet, the third sewage outlet, and the fourth sewage outlet.

[0024] As an alternative technical solution, a fourth valve is further provided between the first pumping device and the volcanic rock filter, and a first sewage outlet is provided between the volcanic rock filter and the fourth valve;

[0025] A second sewage outlet is provided between the volcanic rock filter and the mesh filter, the second sewage outlet and the quartz sand filter are provided in parallel on the biogas slurry pipeline, and a fifth valve and a sixth valve are provided upstream and downstream of the second sewage outlet respectively;

[0026] A third sewage outlet is provided between the mesh filter and the laminated filter;

[0027] The first sewage outlet, the second sewage outlet and the third sewage outlet are all provided with sewage valves.

[0028] As a preferred technical solution, it also includes a sedimentation tank, which is arranged upstream of the biogas slurry tank and includes:

[0029] The sedimentation area is arranged vertically in the sedimentation tank;

[0030] The filtration zone is arranged vertically side by side with the sedimentation zone in the sedimentation tank;

[0031] The filtration zone is connected to the bottom of the precipitation zone.

[0032] As a preferred technical solution, the filtration area includes two sections, the upper filtration area and the lower filtration area are connected through a filter plate.

[0033] As a preferred technical solution, a straw filtering layer is provided at the upper part of the upper filtering zone.

[0034] As a preferred technical solution, the irrigation pipeline is composed of a plurality of irrigation branches connected in parallel, valves are installed at the ends of the irrigation branches, and a plurality of emitters are arranged on each irrigation branch.

[0035] The technical solution provided by the present invention has the following technical effects:

[0036] 1. The irrigation device provided by the present invention comprises: a biogas slurry pipeline, one end of which is connected to a biogas slurry tank, and the other end of which is connected to an irrigation pipeline, wherein a plurality of filtering devices are connected in series on the biogas slurry pipeline; a clean water pipeline, one end of which is connected to a clean water tank, and the other end of which is connected to the irrigation pipeline after merging with the end of the biogas slurry pipeline; a first pumping device, which is connected in series upstream of the biogas slurry pipeline and is suitable for pumping biogas from the biogas slurry tank to the biogas slurry pipeline; a second pumping device, which is connected in series upstream of the clean water pipeline and is suitable for pumping clean water from the clean water tank to the clean water pipeline; a reflux pipeline, one end of which is connected to the end of the biogas slurry pipeline and the other end of which is connected to the clean water pipeline; the connection point between the reflux pipeline and the biogas slurry pipeline is located downstream of the filtering device, the connection point between the reflux pipeline and the clean water pipeline is located downstream of the second pumping device, and a first valve is provided on the reflux pipeline.

[0037] In the above structure, after the biogas slurry is filtered through the biogas pipeline and several filtering devices, it enters the farmland through the irrigation pipeline, and is mixed and diluted with the clean water transported from the clean water pipeline before entering the farmland. When the filtering device needs to be cleaned, the first valve on the reflux pipeline is opened, and the clean water enters the end of the biogas pipeline through the clean water pipeline and the reflux pipeline in turn, and then passes through the filtering device in the reverse direction in the biogas pipeline to complete the cleaning of the filtering device. In the above process, there is no need to separately install power components such as air compressors, water pumps, etc. and redundant branches supporting them in order to clean the filtering device. Only a reflux pipeline is added to achieve the cleaning of the filtering device, which effectively reduces the complexity of the equipment and reduces the construction cost of the equipment.

[0038] 2. The irrigation device provided by the present invention also includes: a second valve, which is arranged at the end of the biogas slurry pipeline and is located downstream of the connection between the biogas slurry pipeline and the return pipeline; a third valve, which is arranged at the end of the clean water pipeline and is located downstream of the connection between the clean water pipeline and the return pipeline.

[0039] In the above structure, when the filter device needs to be cleaned, after closing the second gate and the third gate, the pressure of the second pumping device can be fully transmitted to the biogas slurry pipeline. The increased cleaning pressure in the biogas slurry pipeline is conducive to the removal of blockages.

[0040] 3. The irrigation device provided by the present invention further includes a mixing tank, which is arranged at the junction of the clean water pipeline and the biogas slurry pipeline, and connects the clean water pipeline, the biogas slurry pipeline and the irrigation pipeline. The existence of the mixing tank can increase the mixing area of ​​clean water and biogas slurry, which is conducive to better dilution of biogas slurry and more conducive to crop absorption and utilization.

[0041] 4. In the irrigation device provided by the present invention, the mixing tank is provided with a material injection port, which can be used to inject fertilizers or cleaning agents into the mixing tank, thereby facilitating the integrated irrigation of biogas slurry, water and fertilizer, and facilitating the cleaning of the irrigation pipeline.

[0042] 5. In the irrigation device provided by the present invention, the filtering device comprises a volcanic rock filter, a quartz sand filter, a mesh filter, and a laminated filter which are sequentially connected in series from the biogas pool to the irrigation pipeline. The particles filtered out by the volcanic rock filter, the quartz sand filter, the mesh filter, and the laminated filter gradually become smaller, and the biogas residue can be removed more effectively through such step-by-step filtration.

[0043] 7. In the irrigation device provided by the present invention, a fourth valve is further provided between the first pumping device and the volcanic rock filter, a first sewage outlet is provided between the volcanic rock filter and the fourth valve, a second sewage outlet is provided between the volcanic rock filter and the quartz sand filter, a third sewage outlet is provided between the quartz sand filter and the mesh filter, a fourth sewage outlet is provided between the mesh filter and the laminated filter, and sewage valves are provided at the first sewage outlet, the second sewage outlet, the third sewage outlet, and the fourth sewage outlet.

[0044] In the above structure, after closing the fourth valve, opening the sewage valve upstream of the corresponding filter device can realize separate cleaning of the filter device, which is beneficial to improving the cleaning effect of the single filter device.

[0045] 8. In the irrigation device provided by the present invention, a fourth valve is further provided between the first pumping device and the volcanic rock filter, a first sewage outlet is provided between the volcanic rock filter and the fourth valve; a second sewage outlet is provided between the volcanic rock filter and the mesh filter, the second sewage outlet and the quartz sand filter are provided in parallel on the biogas slurry pipeline, a fifth valve and a sixth valve are provided upstream and downstream of the second sewage outlet respectively; a third sewage outlet is provided between the mesh filter and the laminated filter; sewage valves are provided at the first sewage outlet, the second sewage outlet and the third sewage outlet.

[0046] The above structure is an alternative way of setting the sewage outlet, which can also achieve the purpose of individually cleaning the filter device and is also beneficial to improving the cleaning effect of a single filter device.

[0047] 9. The irrigation device provided by the present invention further includes a sedimentation tank, including: a sedimentation area, which is vertically arranged in the sedimentation tank; a filtration area, which is vertically arranged side by side with the sedimentation area in the sedimentation tank; and the filtration area is connected to the sedimentation area. Compared with the method of setting the sedimentation tank as a single pool for only sedimentation, after the sedimentation tank is divided into a sedimentation area and a filtration area, a preliminary filtration effect can be achieved on the biogas slurry, the working pressure of the downstream filtration device can be reduced, and the filtration effect of the biogas slurry can be improved.

[0048] 11. In the irrigation device provided by the present invention, a straw filter layer is provided at the upstream of the filter area. The straw filter layer has the advantage of convenient material collection, and on the other hand, the straw filter layer can be used as organic fertilizer after being dried and fermented, achieving the effect of one material for multiple uses.

[0049] In summary, the biogas slurry filtering irrigation device provided by the present invention has the advantages of simple structure, low cost and good filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic structural diagram of a specific implementation of the irrigation device provided by the present invention;

[0052] Figure 2 for Figure 1 A schematic structural diagram of an alternative embodiment of the irrigation device shown;

[0053] Figure 3 A schematic diagram of the planar structure of a sedimentation tank in the irrigation device provided by the present invention;

[0054] Description of reference numerals:

[0055] 1. Biogas slurry pipeline; 2. Biogas slurry tank; 3. Irrigation pipeline; 4. Sedimentation tank; 5. Clean water pipeline; 6. Clean water tank; 7. First pumping device; 8. Second pumping device; 9. Reflux pipeline; 10. First valve; 11. Second valve; 12. Third valve; 13. Mixing tank; 15. Volcanic rock filter; 16. Quartz sand filter; 17. Mesh filter; 18. Laminated filter; 19. Fourth valve; 20. First sewage outlet; 21. Second sewage outlet; 22. Third sewage outlet; 23. Fourth sewage outlet; 25. Fifth valve; 26. Sixth valve; 27. Sedimentation area; 28. Filtration area; 29. ​​Straw filter layer; 30. Irrigation branch pipe. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0060] A concept that needs to be explained in advance is that all upstream and downstream mentioned in this embodiment are based on the flow direction of the biogas slurry from the sedimentation tank 4 to the irrigation pipe 3, the side close to the sedimentation tank 4 is the upstream, and the side close to the irrigation pipe 3 is the downstream.

[0061] See also Figure 1, is a specific implementation mode provided by the present invention, which is a biogas slurry filtering irrigation device, used for filtering biogas slurry for irrigation. The present embodiment includes: a biogas slurry pipeline 1, one end of which is connected to a biogas slurry tank 2, and the other end of which is connected to an irrigation pipeline 3, wherein the biogas slurry pipeline 1 is connected in series with a plurality of filtering devices; a clean water pipeline 5, one end of which is connected to a clean water tank 6, and the other end of which is connected to the irrigation pipeline 3 after merging with the end of the biogas slurry pipeline 1; a first pumping device 7, which is connected in series upstream of the biogas slurry pipeline 1, and is suitable for pumping biogas from the biogas slurry tank 2 to the biogas slurry pipeline 1; a second pumping device 8, which is connected in series upstream of the clean water pipeline 5, and is suitable for pumping clean water from the clean water tank 6 to the clean water pipeline 5; a reflux pipeline 9, one end of which is connected to the end of the biogas slurry pipeline 1, and the other end of which is connected to the clean water pipeline 5; the connection point between the reflux pipeline 9 and the biogas slurry pipeline 1 is located downstream of the filtering device, and the connection point between the reflux pipeline 9 and the clean water pipeline 5 is located downstream of the second pumping device 8, and the reflux pipeline 9 is provided with a first valve 10.

[0062] In the above structure, after the biogas slurry is filtered through the biogas slurry pipeline 1 and several filtering devices, it enters the farmland through the irrigation pipeline 3, and is mixed and diluted with the clean water transported from the clean water pipeline 5 before entering the farmland. When the filtering device needs to be cleaned, the first valve 10 on the reflux pipeline 9 is opened, and the clean water enters the end of the biogas slurry pipeline 1 through the clean water pipeline 5 and the reflux pipeline 9 in turn, and then passes through the filtering device in the reverse direction in the biogas slurry pipeline 1 to complete the cleaning of the filtering device. In the above process, there is no need to separately install power components such as air compressors, water pumps, etc. and redundant branches supporting them in order to clean the filtering device. Only one reflux pipeline 9 is added to achieve the cleaning of the filtering device, which effectively reduces the complexity of the equipment and reduces the construction cost of the equipment.

[0063] In order to increase the water pressure during reverse cleaning of the second pumping device 8, the second valve 11 is further included, which is arranged at the end of the biogas slurry pipeline 1 and is located downstream of the connection between the biogas slurry pipeline 1 and the return pipeline 9; and the third valve 12 is arranged at the end of the clean water pipeline 5 and is located downstream of the connection between the clean water pipeline 5 and the return pipeline 9. When the second valve 11 and the third valve 12 are closed, the water pressure applied by the second pumping device 8 to the return pipeline 9 can all reach the biogas slurry pipeline 1, and the irrigation pipeline 3 will not divert the water pressure of the clean water, thereby ensuring the water pressure during cleaning.

[0064] In order to provide a sufficient mixing area for clean water and biogas slurry, a mixing tank 13 is also included, which is arranged at the junction of the clean water pipeline 5 and the biogas slurry pipeline 1, and connects the clean water pipeline 5, the biogas slurry pipeline 1 and the irrigation pipeline 3. The mixing tank 13 is provided with a material injection port. The material injection port can be used to inject fertilizers or cleaning agents into the mixing tank 13, so as to realize the integrated irrigation of biogas slurry, water and fertilizer, and also facilitate the cleaning of the irrigation pipeline 3.

[0065] The filtering device includes a volcanic rock filter 15, a quartz sand filter 16, a mesh filter 17, and a laminated filter 18 which are sequentially connected in series from the biogas pool 2 to the irrigation pipeline 3. The volcanic rock filter 15 and the quartz sand filter 16 are both in the shape of a can, with a liquid inlet and a liquid outlet at both ends, and are filled with volcanic rocks and quartz sand respectively. The mesh filter 17 and the laminated filter 18 are the same as those generally available on the market. The first pumping device 7 is arranged between the biogas pool 2 and the volcanic rock filter 15, and is suitable for pumping the biogas in the biogas pool 2 into the biogas pipeline 1. The filter particles of the submerged volcanic rock filter 15, the quartz sand filter 16, the mesh filter 17, and the laminated filter 18 are reduced from large to small, and the biogas residue can be removed more effectively through such step-by-step filtration.

[0066] A fourth valve 19 is further provided between the first pumping device 7 and the volcanic rock filter 15. When the fourth valve 19 is closed, the first pumping device 7 is not impacted by the backflow.

[0067] As an implementation mode of the above-mentioned sewage outlet setting, a fourth valve 19 is further provided between the first pumping device 7 and the volcanic rock filter 15, and a first sewage outlet 20 is provided between the volcanic rock filter 15 and the fourth valve 19; a second sewage outlet 21 is provided between the volcanic rock filter 15 and the mesh filter 17, the second sewage outlet 21 and the quartz sand filter 16 are provided in parallel on the biogas slurry pipeline 1, and the fourth valve 19 and the fifth valve 25 are provided upstream and downstream of the second sewage outlet 21 respectively; a third sewage outlet 22 is provided between the mesh filter 17 and the laminated filter 18; sewage valves are provided at the first sewage outlet 20, the second sewage outlet 21, and the third sewage outlet 22.

[0068] The above structure is a preferred embodiment of a sewage outlet setting method, which can achieve the purpose of cleaning the filter device separately. Specifically, when the laminated filter 18 needs to be cleaned, the fourth valve 19, the fifth valve 25 and the sixth valve 26 are closed, the sewage valve on the third sewage outlet 22 is opened, and other sewage valves are closed; when the mesh filter 17 needs to be cleaned, the fourth valve 19 and the fifth valve 25 are closed, the sewage valve and the sixth valve 26 on the second sewage outlet 21 are opened, and other sewage valves are closed; when the quartz sand filter 16 needs to be cleaned, the fourth valve 19 and the sixth valve 26 are closed, the sewage valve on the fifth valve 25 and the second sewage outlet 21 are opened, and other sewage valves are closed; when the volcanic rock filter 15 needs to be cleaned, the fourth valve 19 is closed, the fifth valve 25 and the sixth valve 26 are opened, the sewage valve on the first sewage outlet 20 is opened, and other sewage valves are closed.

[0069] As an alternative embodiment of the above-mentioned sewage outlet arrangement, see Figure 2A first sewage outlet 20 is provided between the volcanic rock filter 15 and the fourth valve 19, a second sewage outlet 21 is provided between the volcanic rock filter 15 and the quartz sand filter 16, a third sewage outlet 22 is provided between the quartz sand filter 16 and the mesh filter 17, and a fourth sewage outlet 23 is provided between the mesh filter 17 and the laminated filter 18. Sewage valves are provided at the first sewage outlet 20, the second sewage outlet 21, the third sewage outlet 22, and the fourth sewage outlet 23. After closing the fourth valve 19, opening the sewage valve upstream of the corresponding filter device can realize the separate cleaning of the filter device, which is beneficial to improve the cleaning effect of the single filter device.

[0070] See also Figure 3 In this embodiment, a sedimentation tank 4 is also included, and the sedimentation tank 4 includes: a sedimentation area 27, which is vertically arranged in the sedimentation tank 4; a filter area 28, which is vertically arranged side by side with the sedimentation area 27 in the sedimentation tank 4; and the connection between the filter area 28 and the sedimentation area 27. The filter area 28 includes an upper and lower section, and the upper filter area 28 and the lower filter area 28 are connected through a filter plate. A straw filter layer 29 is arranged upstream of the upper filter area 28. Compared with the method of setting the sedimentation tank 4 as a single pool for only sedimentation, after the sedimentation tank 4 is divided into the sedimentation area 27 and the filter area 28, a preliminary filtering effect can be achieved on the biogas slurry, the working pressure of the downstream filter device can be reduced, and the biogas slurry filtering effect can be improved. On the one hand, the straw filter layer 29 has the advantage of convenient material collection. On the other hand, the straw filter layer 29 can be used as organic fertilizer after being dried and fermented after use, achieving the effect of one material for multiple uses.

[0071] The action process of the above irrigation device is:

[0072] When irrigation is needed, the second valve 11, the third valve 12 and the fourth valve 19 are opened, and the remaining valves, the sewage valve and the valves at the tail of each irrigation branch pipe 30 are closed; the biogas slurry enters the biogas slurry pool 2 from the sedimentation tank 4, passes through the biogas slurry pipeline 1 in sequence through the volcanic stone filter, the quartz sand filter 16, the mesh filter 17 and the laminated filter 18, and enters the mixing tank 13 after passing through the second valve 11; the clean water in the clean water pool 6 passes through the mesh filter 17 and the laminated filter 18 in sequence through the clean water pipeline 5, and enters the mixing tank 13 through the third valve 12; after being filtered in the mixing tank 13, the biogas slurry is mixed with clean water and fertilizer and then enters the irrigation pipeline 3, and is discharged through the emitter on the irrigation branch pipe 30.

[0073] When cleaning the irrigation pipeline 3, close the second valve 11 and the first valve 10, open the third valve 12 and the valves at the end of each irrigation branch pipe 30, and the water in the clean water tank 6 is pumped into the clean water pipeline 5 through the mesh filter 17, the laminated filter 18 and the third valve 12 to enter the mixing tank 13 to be mixed with the cleaning agent, and then enters the irrigation pipeline 3 for cleaning, and is discharged through the valves at the end of each irrigation branch pipe 30.

[0074] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A biogas slurry filtering irrigation device, comprising: A biogas slurry pipeline, one end of which is connected to the biogas slurry tank, and the other end of which is connected to the irrigation pipeline, wherein a plurality of filtering devices are connected in series on the biogas slurry pipeline; A clean water pipeline, one end of which is connected to the clean water tank, and the other end of which is connected to the irrigation pipeline after merging with the end of the biogas slurry pipeline; A first pumping device is connected in series upstream of the biogas slurry pipeline and is suitable for pumping the biogas slurry from the biogas slurry tank to the biogas slurry pipeline; A second pumping device, connected in series upstream of the clean water pipeline, is suitable for pumping clean water from the clean water tank into the clean water pipeline; It is characterized by further comprising: A reflux pipeline, one end of which is connected to the end of the biogas slurry pipeline, and the other end of which is connected to the clean water pipeline; the connection point between the reflux pipeline and the biogas slurry pipeline is located downstream of the filtering device, and the connection point between the reflux pipeline and the clean water pipeline is located downstream of the second pumping device, and a first valve is provided on the reflux pipeline; When the filter device needs to be cleaned, the first valve on the return pipe is opened, and clean water enters the end of the biogas slurry pipe through the clean water pipe and the return pipe in sequence, and then passes through the filter device in the reverse direction in the biogas slurry pipe to complete the cleaning of the filter device; A second valve is arranged at the end of the biogas slurry pipeline and is located downstream of the connection between the biogas slurry pipeline and the return pipeline; A third valve is arranged at the end of the clean water pipeline and is located downstream of the connection between the clean water pipeline and the return pipeline; The filtering device comprises a volcanic rock filter, a quartz sand filter, a mesh filter, and a laminated filter which are sequentially connected in series from the biogas slurry pool to the irrigation pipeline; The first pumping device is disposed between the biogas slurry tank and the volcanic rock filter, and is suitable for pumping the biogas slurry in the biogas slurry tank into the biogas slurry pipeline; A fourth valve is also provided between the first pumping device and the volcanic rock filter, and a first sewage outlet is provided between the volcanic rock filter and the fourth valve; It also includes a sedimentation tank, which is arranged upstream of the biogas slurry tank and includes: The sedimentation area is arranged vertically in the sedimentation tank; The filtration zone is arranged vertically side by side with the sedimentation zone in the sedimentation tank; The filtration zone is connected to the sedimentation zone; The filter area includes an upper and a lower section, and the upper filter area is connected to the lower filter area through a filter plate; a straw filter layer is arranged upstream of the upper filter area.

2. A biogas slurry filtering and irrigation device according to claim 1, characterized in that: Also includes: The mixing tank is arranged at the junction of the clean water pipeline and the biogas liquid pipeline, and connects the clean water pipeline, the biogas liquid pipeline and the irrigation pipeline.

3. The biogas slurry filtering and irrigation device according to claim 2, characterized in that: The mixing tank is provided with a material injection port.

4. A biogas slurry filtration irrigation device according to any one of claims 1 to 3, characterized in that: A second sewage outlet is provided between the volcanic rock filter and the quartz sand filter, a third sewage outlet is provided between the quartz sand filter and the mesh filter, a fourth sewage outlet is provided between the mesh filter and the laminated filter, and sewage valves are provided at the first sewage outlet, the second sewage outlet, the third sewage outlet and the fourth sewage outlet.

5. The biogas slurry filtering and irrigation device according to claim 4, characterized in that: A second sewage outlet is provided between the volcanic rock filter and the mesh filter, the second sewage outlet and the quartz sand filter are provided in parallel on the biogas slurry pipeline, and a fifth valve and a sixth valve are provided upstream and downstream of the second sewage outlet respectively; A third sewage outlet is provided between the mesh filter and the laminated filter; The first sewage outlet, the second sewage outlet and the third sewage outlet are all provided with sewage valves.

6. A biogas slurry filtering and irrigation device according to any one of claims 1 to 3, characterized in that: The irrigation pipeline is composed of a plurality of irrigation branches connected in parallel, valves are installed at the ends of the irrigation branches, and a plurality of emitters are arranged on each irrigation branch.

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