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CN-121991793-A - Straw dry fermentation methane tank

CN121991793ACN 121991793 ACN121991793 ACN 121991793ACN-121991793-A

Abstract

The application discloses a straw dry fermentation biogas digester, which relates to the technical field of biogas engineering, and is characterized in that a first sealing groove and a second sealing groove are formed on the outer side of the bottom of a biogas slurry storage layer, two sealing lines are formed by matching with a second support frame and the first support frame, the biogas collection rate can be improved to more than 95% by matching with sealing doors and anti-seepage coatings of all areas of a main body frame, the operation requirements under different climates can be met, biogas leakage and potential safety hazards caused by sealing failure are avoided, and the sealing reliability is high. The application adopts a dry fermentation process, the raw materials do not need to be crushed into liquid, and crushed straw particles can be adopted, so that the raw material pretreatment flow is simplified, and the pretreatment cost is reduced. Meanwhile, the structure of the steel structure frame and the flexible sealing element is adopted to replace the traditional hard tank body, the material and processing cost of the steel structure frame are adopted, and the cost of the flexible sealing film is far lower than that of the tank body; meanwhile, the frame structure is short in construction period and convenient to install, and labor and equipment leasing cost can be reduced.

Inventors

  • LIANG HAIFU

Assignees

  • 梁海付

Dates

Publication Date
20260508
Application Date
20260210

Claims (10)

  1. 1. The straw dry fermentation biogas digester is characterized by comprising a main body frame (1), a supporting component (3) and an annular auxiliary frame (2), wherein the main body frame (1) is arranged in the center of the straw dry fermentation biogas digester, the annular auxiliary frame (2) is fixedly arranged on the outer side of the main body frame (1) in a surrounding mode, and the main body frame (1) is fixedly arranged on the supporting component (3).
  2. 2. The dry fermentation biogas digester for straws according to claim 1 is characterized in that the main body frame (1) comprises a biogas slurry storage layer (11), a fermentation layer (12), an isolation layer (13), a feeding layer (14) and a top layer protection layer (15), wherein the biogas slurry storage layer (11) is arranged at the bottom of the main body frame (1), and the fermentation layer (12), the isolation layer (13), the feeding layer (14) and the top layer protection layer (15) are sequentially arranged above the biogas slurry storage layer (11).
  3. 3. The straw dry fermentation biogas digester according to claim 2, wherein a plurality of upturning beams (113) are arranged at the bottom of the biogas slurry storage layer (11), liquid storage tanks (114) are fixedly arranged above the upturning beams (113), first connecting pipes (115) are arranged between the liquid storage tanks (114), the bottoms of the liquid storage tanks (114) are connected to the bottom of the fermentation layer (12) through the first connecting pipes (115), and the liquid storage tanks (114) are connected with each other through the first connecting pipes (115) and are connected with a sewage pump to form a complete biogas slurry circulation system.
  4. 4. The dry fermentation biogas digester of claim 2, wherein a supporting wall 16 is arranged outside the biogas slurry storage layer 11, the fermentation layer 12, the isolation layer 13 and the feed layer 14, a top protection layer 15 is fixedly arranged on the top of the supporting wall 16, and the feed inlet 145 is arranged on the side wall of the supporting wall 16.
  5. 5. The straw dry fermentation biogas digester according to claim 4, wherein the annular auxiliary frame (2) comprises a first supporting frame (21), a second supporting frame (22), a first outer layer sealing piece (231), a second outer layer sealing piece (232), a first inner layer sealing piece (233) and a second inner layer sealing piece (234), the first supporting frame (21) and the second supporting frame (22) are of steel frame structures, the second supporting frame (22) is arranged on the outer side of the main body frame (1), the first supporting frame (21) is arranged on the outer side of the second supporting frame (22), the second inner layer sealing piece (234) is arranged between the first supporting frame (21) and the main body frame (1), and the first outer layer sealing piece (231) is arranged between the first supporting frame (21) and the second supporting frame (22).
  6. 6. The straw dry fermentation biogas digester according to claim 5, wherein a first fixing piece (291) is arranged on the outer wall of the supporting wall (16), the first fixing piece (291) is connected with the top of the first outer sealing piece (231), a plurality of second fixing pieces (292) are arranged on the inner wall of the first supporting frame (21) from top to bottom, the bottom of the first outer sealing piece (231) is connected with the second fixing pieces (292) on the top, a second outer sealing piece (232) is arranged at one end, far away from the first supporting frame (21), of the second fixing pieces (292), and the bottom of the second outer sealing piece (232) is connected with the second fixing pieces (292) below.
  7. 7. The dry fermentation biogas digester of claim 6, wherein a fourth fixing piece (294) is further installed on the outer wall of the supporting wall (16), the fourth fixing piece (294) is connected with the top of the first inner layer sealing piece (233), a plurality of third fixing pieces (293) are installed on the inner wall of the second supporting frame (22) from top to bottom, the bottom of the first inner layer sealing piece (233) is connected with the third fixing pieces (293) on the top, a second inner layer sealing piece (234) is installed at one end, far away from the second supporting frame (22), of the third fixing pieces (293), and the bottom of the second inner layer sealing piece (234) is connected with the third fixing pieces (293) below.
  8. 8. The straw dry fermentation biogas digester according to claim 7 is characterized in that a plurality of first wall connecting pieces (25) are arranged between the second supporting frame (22) and the main body frame (1), a plurality of second wall connecting pieces (28) are arranged between the first supporting frame (21) and the second supporting frame (22), the arrangement of the first wall connecting pieces (25) and the second wall connecting pieces (28) realizes the support of the second supporting frame (22) and the first supporting frame (21), the third fixing pieces (293) are inserted on the first wall connecting pieces (25), and the second fixing pieces (292) are inserted on the second wall connecting pieces (28).
  9. 9. The dry fermentation biogas digester of claim 8, wherein a fifth fixing member (295) is further installed between the supporting wall (16) and the second supporting frame (22), the fifth fixing member (295) is installed at the top of the supporting assembly (3), the lowest second outer sealing member (232) is inserted into the fifth fixing member (295), a sixth fixing member (296) is further installed between the first supporting frame (21) and the second supporting frame (22), the sixth fixing member (296) is installed at the top of the supporting assembly (3), and the lowest second inner sealing member (234) is inserted into the sixth fixing member (296).
  10. 10. The dry fermentation biogas digester as claimed in claim 9, wherein the upper part of the fixing plate (281) is filled with high-performance sealant, so that the sealing reliability between the first sealing member (23) and the second sealing member (24) is ensured, and biogas leakage is prevented.

Description

Straw dry fermentation methane tank Technical Field The invention relates to the technical field of biogas engineering, in particular to a straw dry fermentation biogas digester. Background With the increasing prominence of global energy crisis and environmental problems, the development and utilization of renewable energy sources are important components of energy strategies of various countries. As the main waste of agricultural production, the straw is huge in annual output, and the straw is converted into methane through a dry fermentation process, so that the recycling of the straw can be realized, the environmental pollution caused by incineration treatment is reduced, clean biomass energy can be provided, and the contradiction between energy supply and demand is relieved. However, the development of large-scale straw dry fermentation biogas projects is limited by fermentation and gas storage facilities, and the existing facilities are difficult to meet the requirements of cost, volume and fermentation efficiency, so that the development of the large-scale straw dry fermentation biogas digester with low cost, large volume, high efficiency and stability has important practical significance and application value. In the field of biomass energy utilization, the straw dry fermentation biogas technology has been widely studied and applied because of the advantages of wide raw material adaptability, high biogas production efficiency and easy treatment of biogas residues and biogas slurry. The core facility of the large-scale straw dry fermentation biogas project is a fermentation and gas storage device, and the structural design of the device affects the construction cost, the operation efficiency and the economic benefit of the project. The large straw biogas digester in the prior art mainly adopts a large hard fermentation tank structure, is formed by pouring steel or reinforced concrete materials, and has a cylindrical tank body with a volume of 500-2000 cubic meters. The operation flow is that biogas slurry generated by fermentation is discharged from a liquid outlet at the bottom of a fermentation tank, enters a feeding tank through a conveying pipeline, is mixed with newly collected straw raw materials, forms liquid fermentation raw materials through a crushing and stirring pretreatment process, then adopts a pressure pump as a power source, conveys the mixed liquid raw materials to the feeding port at the top of the fermentation tank through a feeding pipeline at the flow rate of 50 cubic meters per minute, the raw materials enter a fermentation area in the fermentation tank for anaerobic fermentation, and biogas generated by fermentation enters a gas storage system through an exhaust pipeline at the top of the tank body. In order to ensure the fermentation efficiency, the tank body is also provided with a stirring device, a temperature control system and a pressure monitoring device, the fermentation raw materials are stirred regularly, the temperature in the tank is maintained between 35 ℃ and 55 ℃, and the pressure is stabilized within the range of 0.1MPa to 0.3 MPa. Although the existing hard fermentation tank is mature and applied to small-sized biogas projects, when the large-sized straw dry fermentation biogas digester is applied, natural technical defects and limitations exist, and firstly, the construction cost is high, and the material cost and the processing and installation cost of the hard fermentation tank are extremely high. Taking a steel fermentation tank with the volume of 1000 cubic meters as an example, the steel consumption is more than 50 tons, the steel purchasing cost is more than 30 ten thousand yuan, meanwhile, the steel tank body needs to be subjected to corrosion and rust prevention treatment, and an anti-seepage coating is paved on the inner wall, so that the processing cost is further increased. In addition, the installation of the hard fermentation tank requires large hoisting equipment and professional construction team, the installation period is long, the occupation ratio of labor cost and equipment lease cost is large, the overall construction cost is high, and the popularization and application of large projects are restricted. Secondly, the operation cost is high, and a large amount of energy sources are consumed to maintain the operation of equipment in the operation process of the existing hard fermentation tank. On one hand, the raw materials are conveyed by a pressure pump, so that the power consumption is huge, and on the other hand, the stirring device and the temperature control device in the tank body are required to continuously operate, so that the energy consumption expenditure is further increased. Meanwhile, the maintenance cost of the hard fermentation tank is high, the steel tank body is easy to corrode and leak, the steel tank body needs to be overhauled and the coating is required to be replaced regularly, the reinforced concrete tank body has cra