An organic matter recycling system

Abstract

This utility model relates to the field of ecological agriculture technology and discloses an organic matter recycling system, including a livestock farm, a corn feed processing plant, a solid-liquid separation device, a black film anaerobic biogas digester, a biogas purification device, a waste heat recovery device, an organic fertilizer processing device, a biogas slurry storage tank, and a transportation pipeline. The livestock farm is equipped with 5-10 sets for mixed breeding of various livestock. The corn feed plant is equipped with 2 sets. By utilizing solar energy absorption and waste heat recovery, the temperature of the black film anaerobic biogas digester can be maintained above the gas production threshold, thereby achieving continuous gas production throughout the year. At the same time, the stirring device can ensure the fluidity of the biogas slurry and the activity of the bacteria, thereby increasing methane production. The solid-liquid separation device can separate the solid and liquid phases, thereby ensuring the recycling of solid waste and carbon cycle. The biogas purification device can supply biogas to the feed plant and simultaneously supply energy to the county, improving the energy cycle rate.

Description

Technical Field

[0001] This utility model relates to the field of ecological agriculture technology, specifically to an organic matter recycling system. Background Technology

[0002] Currently, the scale of livestock farming in counties is gradually expanding, but if the large amount of livestock and poultry manure produced is not properly treated, it can easily lead to environmental problems such as soil pollution and eutrophication of water bodies. Moreover, biogas production drops significantly in winter, affecting energy utilization and the stable operation of the industrial chain. As a key link in the resource utilization of manure, biogas projects are significantly affected by low winter temperatures. In existing technologies, black film biogas digesters generally lack efficient heat preservation structures. When the temperature is below 25°C, the gas production efficiency drops significantly or even stops, seriously affecting the stability of energy supply. In addition, the recovery rate of residual methane in the process water is low. Therefore, we need to propose an organic matter recycling system. Utility Model Content

[0003] The purpose of this invention is to provide an organic matter recycling system that optimizes the processes of breeding, biogas, feed, and planting to achieve the resource utilization of manure, efficient methane recovery, stable gas production in winter, and organic fertilizer production. This system aims to achieve full resource utilization of manure, stable biogas supply throughout the year, and bidirectional recycling of energy and fertilizer, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an organic matter recycling system, comprising a livestock farm, a corn feed processing plant, a solid-liquid separation device, a black film anaerobic biogas digester, a biogas purification device, a waste heat recovery device, an organic fertilizer processing device, a biogas slurry storage tank, and a conveying pipeline: The breeding farm is set up with 5-10 groups for mixed breeding of various livestock; The corn feed mill is set up in two groups, and the two groups of corn feed mills are located among multiple groups of feed mills. The manure outlet of each group of the farms is connected to the inlet of a solid-liquid separation device, and the solid phase outlet of the solid-liquid separation device is connected to the organic fertilizer processing device, while the liquid phase outlet of the solid-liquid separation device is connected to the inlet of the black film anaerobic biogas digester. The black film anaerobic biogas digester is equipped with a heat preservation structure and a stirring device. The biogas outlet of the black film anaerobic biogas digester is connected to the inlet of the biogas purification device. The biogas purification device is connected to the waste heat recovery device and the organic fertilizer processing device respectively. The black film anaerobic biogas digester is connected to the biogas slurry storage tank. The outlet of the biogas slurry storage tank is connected to the delivery pipeline.

[0005] Preferably, the black film anaerobic biogas digester is a trapezoidal digester. The side walls and bottom walls of the black film anaerobic biogas digester are provided with heat insulation layers. The surface of the heat insulation layers is covered with a black film. The top of the black film anaerobic biogas digester is covered with a top film, and the upper surface of the top film is provided with a solar heat absorption and heat insulation coating. The interior of the black film anaerobic biogas digester is provided with heat insulation coils. The stirring device is 5-10 sets of stirrers with cyclone pumps.

[0006] Preferably, the biogas purification device has two sets of natural gas outlets. One set of the natural gas outlets of the biogas purification device is connected to the energy inlet of the corn feed processing plant, and the other set of the natural gas outlets of the biogas purification device is connected to the county energy grid. The biogas purification device includes a desulfurization unit, a dehydration unit, and a CO2 removal unit.

[0007] Preferably, the organic fertilizer processing device includes a drying unit and a batching unit. The sulfur outlet of the biogas purification device is connected to the inlet of the organic fertilizer processing device. The drying temperature of the drying unit is 60-80℃. The moisture content of the solid material output by the drying unit is less than 20%. The batching unit mixes the sulfur produced by the purification and desulfurization unit with the solid material.

[0008] Preferably, the insulation layer is a polyurethane insulation board with a thickness of 5-8 cm, the black film is an HDPE geomembrane with a thickness of 1.5-2 mm, the top film is an HDPE film, and the solar heat-absorbing insulation coating has a thickness of 0.1-0.2 mm.

[0009] Preferably, the black membrane anaerobic biogas digester is equipped with a low-temperature resistant methanogenic strain, which is a low-temperature adapted strain.

[0010] Preferably, the insulation coil is made of stainless steel, the spacing between adjacent insulation coils is 1.5-2m, the length of the conveying pipeline is PE pipe, and the length of the conveying pipeline is 5km.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention mainly utilizes the combination of a black film anaerobic biogas digester, a biogas purification device, a solid-liquid separation device, an organic fertilizer processing device, and a waste heat recovery device. By leveraging solar energy absorption and waste heat recovery, the temperature of the black film anaerobic biogas digester can be maintained above the gas production threshold, thus achieving continuous gas production throughout the year. Simultaneously, the stirring device ensures the fluidity of the biogas slurry and the activity of the microorganisms, thereby increasing methane production. The solid-liquid separation device separates the solid and liquid phases, ensuring the recycling of solid waste and carbon cycling. The biogas purification device can supply biogas to feed mills and also to the county's energy supply, improving the energy cycle rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structural distribution of this utility model; Figure 2 This is a schematic diagram of the structure of the black membrane anaerobic biogas digester of this utility model.

[0013] In the diagram, 1 is the pool body; 2 is the insulation layer; 3 is the black membrane; and 4 is the top membrane. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1 This utility model provides a technical solution: an organic matter recycling system, including a livestock farm, a corn feed processing plant, a solid-liquid separation device, a black film anaerobic biogas digester, a biogas purification device, a waste heat recovery device, an organic fertilizer processing device, a biogas slurry storage tank, and a conveying pipeline. The farm is set up with 5-10 groups for mixed breeding of various livestock; There are two sets of corn feed mills, and the two sets of corn feed mills are located between multiple sets of feed mills; The manure outlet of each group of farms is connected to the inlet of a solid-liquid separation device, and the solid phase outlet of the solid-liquid separation device is connected to the organic fertilizer processing device, while the liquid phase outlet of the solid-liquid separation device is connected to the inlet of the black film anaerobic biogas digester. The black film anaerobic biogas digester is equipped with a heat preservation structure and a stirring device. The biogas outlet of the black film anaerobic biogas digester is connected to the inlet of the biogas purification device. The biogas purification device is connected to the waste heat recovery device and the organic fertilizer processing device respectively. The black film anaerobic biogas digester is connected to the biogas slurry storage tank. The outlet of the biogas slurry storage tank is connected to the delivery pipeline, and the biogas slurry storage tank is a reinforced concrete structure.

[0016] The black film anaerobic biogas digester is a trapezoidal digester. The side walls and bottom walls of the black film anaerobic biogas digester are equipped with heat insulation layers, and the surface of the heat insulation layers is covered with black film. The top of the black film anaerobic biogas digester is covered with a top film, and the upper surface of the top film is equipped with a solar heat absorption and heat insulation coating. The interior of the black film anaerobic biogas digester is equipped with heat insulation coils, and the stirring device consists of 5-10 sets of agitators with vortex pumps. In this embodiment, the black membrane anaerobic biogas digester has a bottom width of 8-12m, a top width of 1-16m, a depth of 4-6m, and an effective volume of 300-500m³. 3The black membrane anaerobic biogas digester is also equipped with a mud pump with a power of 5.5-7.5kW. The agitator with a vortex pump has a power of 3.0-5.0kW. The agitator with the vortex pump works once every 2 hours, and each working time is 30 minutes.

[0017] The biogas purification unit has two sets of natural gas outlets. One set of natural gas outlets is connected to the energy inlet of the corn feed processing plant, and the other set of natural gas outlets is connected to the county energy grid. The biogas purification unit includes a desulfurization unit, a dehydration unit, and a CO2 removal unit. The desulfurization unit is filled with iron oxide desulfurizing agent with a particle size of 3-5 mm. The dehydration unit is filled with 13X type molecular sieves. The CO2 removal unit adopts the amine process and is equipped with a process water pipeline with a flow rate of 10-15 m³ / h. 3 / h.

[0018] The organic fertilizer processing unit includes a drying unit and a batching unit. The sulfur outlet of the biogas purification unit is connected to the inlet of the organic fertilizer processing unit. The drying temperature of the drying unit is 60-80℃, and the moisture content of the solid material output by the drying unit is less than 20%. The batching unit mixes the sulfur produced by the purification and desulfurization unit with the solid material. The amount of sulfur added is 0.5-1.0% of the mass of the solid material.

[0019] The insulation layer is made of polyurethane insulation board (density 40-60 kg / m³). 3 The insulation board has a thermal conductivity ≤0.024W / (m・K), compressive strength ≥0.3MPa, and a thickness of 5-8cm. It is bonded to the concrete base of the pool with a special adhesive. The gaps between the boards are filled with polyurethane foam. The insulation layer is 5-8cm thick. The black membrane is an HDPE geomembrane with a thickness of 1.5-2mm. The top membrane is an HDPE membrane. The solar heat-absorbing insulation coating has a thickness of 0.1-0.2mm (solar absorptivity ≥0.85, emissivity ≤0.15, thermal conductivity ≤0.03W / (m・K), and weather resistance ≥5000h).

[0020] The black film anaerobic biogas digester is inoculated with low-temperature resistant methanogenic strains. The low-temperature resistant methanogenic strains are low-temperature adapted strains. The low-temperature resistant methanogenic strains inoculated inside the black film anaerobic biogas digester are low-temperature adapted strains of Methanosarcina mazei. This strain remains active at 15°C, and its methane yield is ≥0.30 mg / L at 20°C. 3 / (m 3 •d), methane yield ≥0.35m at 25℃ 3 / (m 3 •d), methane yield ≥0.40m at 30℃ 3 / (m 3 •d); The inoculation method is liquid inoculation, with an inoculation amount of 5-8% of the total volume of biogas slurry. After inoculation, the mixture is continuously stirred for 2-3 hours to ensure uniform dispersion of the strain. The biogas digester is also equipped with an online pH monitor (model PHG-217, measurement range 0-14 pH, accuracy ±0.01 pH) and a temperature sensor (model PT100, measurement range -20-100℃, accuracy ±0.1℃) to regulate the environment in the digester in real time to maintain the activity of the strain.

[0021] The insulation coils are made of stainless steel, with a spacing of 1.5-2m between adjacent insulation coils. The transmission pipeline is made of PE pipe and has a length of 5km. After the transmission length of the pipeline is exceeded, the natural gas is transported to other areas of the county by vehicle-mounted tanker.

[0022] Specifically, taking the county as a unit, local corn is first processed into feed through two corn feed processing plants (using crushing, mixing and pelleting processes), and then transported to 5-10 groups of farms (for mixed breeding of pigs, chickens and cattle). The manure and sludge produced by the farms first enter the supporting solid-liquid separation device. After separation, the solid phase material is transported to the organic fertilizer processing device, while the liquid phase material is sent to the black film anaerobic biogas digester supporting each farm. The black membrane anaerobic biogas digester maintains its temperature through a trapezoidal pool body insulation layer (polyurethane insulation board), a roof membrane solar heat absorption coating, and internal insulation coils (utilizing waste heat from biogas purification). Combined with 5-10 sets of agitators with cyclone pumps and low-temperature resistant methanogenic bacteria, it achieves efficient reaction of biogas slurry and produces biogas. The biogas enters the biogas purification device and undergoes three-stage purification: desulfurization (iron oxide desulfurizing agent), dehydration (13X molecular sieve), and CO2 removal (amine process). Part of the natural gas obtained is returned to the corn feed processing plant as energy, and the other part is connected to the county energy grid. The sulfur by-products produced during purification are transported to the organic fertilizer processing device, while the carbon dioxide is sent to the planting area. The organic fertilizer processing device first dries the solid materials at 60-80℃ (ensuring a moisture content of ≤20%), then mixes them with sulfur purified from biogas to produce high-quality organic fertilizer for corn planting. Part of the biogas slurry produced by the black film anaerobic biogas digester is returned to the digester to adjust the concentration, and the other part is sent to the biogas slurry storage tank. Finally, it is sent to the planting area for fertilization through PE pipelines, forming a cycle.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An organic matter recycling system, characterized in that, This includes a livestock farm, a corn feed processing plant, a solid-liquid separation unit, a black film anaerobic biogas digester, a biogas purification unit, a waste heat recovery unit, an organic fertilizer processing unit, a biogas slurry storage tank, and transmission pipelines. The breeding farm is set up with 5-10 groups for mixed breeding of various livestock; The corn feed processing plant is set up in two groups, and the two groups of corn feed plants are located between multiple groups of feed plants; The manure outlet of each group of the farms is connected to the inlet of a solid-liquid separation device, and the solid phase outlet of the solid-liquid separation device is connected to the organic fertilizer processing device, while the liquid phase outlet of the solid-liquid separation device is connected to the inlet of the black film anaerobic biogas digester. The black film anaerobic biogas digester is equipped with a heat preservation structure and a stirring device. The biogas outlet of the black film anaerobic biogas digester is connected to the inlet of the biogas purification device. The biogas purification device is connected to the waste heat recovery device and the organic fertilizer processing device respectively. The black film anaerobic biogas digester is connected to the biogas slurry storage tank. The outlet of the biogas slurry storage tank is connected to the delivery pipeline.

2. The organic matter recycling system according to claim 1, characterized in that: The black film anaerobic biogas digester is a trapezoidal tank. The side walls and bottom walls of the black film anaerobic biogas digester are provided with heat insulation layers. The surface of the heat insulation layers is covered with a black film. The top of the black film anaerobic biogas digester is covered with a top film, and the upper surface of the top film is provided with a solar heat absorption and heat insulation coating. The interior of the black film anaerobic biogas digester is provided with heat insulation coils. The stirring device consists of 5-10 sets of stirrers with cyclone pumps.

3. The organic matter recycling system according to claim 1, characterized in that: The biogas purification device has two sets of natural gas outlets. One set of the natural gas outlets of the biogas purification device is connected to the energy inlet of the corn feed processing plant, and the other set of the natural gas outlets of the biogas purification device is connected to the county energy grid. The biogas purification device includes a desulfurization unit, a dehydration unit, and a CO2 removal unit.

4. The organic matter recycling system according to claim 1, characterized in that: The organic fertilizer processing device includes a drying unit and a batching unit. The sulfur outlet of the biogas purification device is connected to the inlet of the organic fertilizer processing device. The drying temperature of the drying unit is 60-80℃. The moisture content of the solid material output by the drying unit is less than 20%. The batching unit mixes the sulfur produced by the purification and desulfurization unit with the solid material.

5. An organic matter recycling system according to claim 2, characterized in that: The insulation layer is a polyurethane insulation board with a thickness of 5-8cm. The black film is an HDPE geomembrane with a thickness of 1.5-2mm. The top film is an HDPE film. The solar heat-absorbing insulation coating has a thickness of 0.1-0.2mm.

6. An organic matter recycling system according to claim 1, characterized in that: The black membrane anaerobic biogas digester is equipped with low-temperature resistant methanogenic strains, which are low-temperature adapted strains.

7. An organic matter recycling system according to claim 2, characterized in that: The insulation coil is made of stainless steel, and the spacing between adjacent insulation coils is 1.5-2m. The conveying pipeline is made of PE pipe and has a length of 5km.

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