FRP biogas digester performance

First, the characteristics of the glass and steel arch cover biogas digester. The glass-fiber reinforced plastic gas pool is a biogas tank in which the gas box of the digester is made of fiberglass, and the rest of the plant uses a methane tank with a brick-concrete or concrete structure.

1. Long-term investment cost is small: Although the construction pool cost is slightly higher than that of an ordinary biogas digester in the same pool, the service life after completion is more than 20 years, and maintenance and maintenance are basically unnecessary. Ordinary biogas digesters must maintain the air box part every 3-5 years.

2. Good effect of gas production: As the pores of polymer fiberglass materials are 110-10 meters, the pores of concrete are 510-8 meters, and the diameter of methane molecules is 410-9 meters, so under the pressure, the diameter of methane molecules is determined. Biogas leaks easily from concrete structures, because methane molecules have a pore size 40 times larger than FRP material structure, and methane molecules cannot pass through, so biogas leakage does not occur. According to tests conducted by the Ministry of Agriculture’s Biogas Research Institute, under the same conditions, the gas production capacity of glass-fiber reinforced plastic gas pools is 26% more than that of concrete digesters, and the annual gas production per household is more than 100 cubic meters, especially in the winter, most of the users of glass-fiber reinforced plastic gas pools You can cook three meals a day, while the biogas digesters of other materials cook 1-2 meals a day.

3. Easy to operate Fast construction: The air box is the key part of the biogas tank. The FRP arch cover not only solves this key technical problem, but also simplifies the complicated process of the traditional biogas digester “three wipe, four brushes and seven layers”. Not only the quality but also the quality Reliable protection, and the duration can be shortened by 3-4 days.

Second, the capacity of glass fiber reinforced plastic gas pool covers. In order to facilitate transportation, improve compressive strength, and reduce costs, the company determined the diameter of the glass fiber reinforced plastic digester cover to be 2.32 meters through repeated tests. At the time of construction, the depth of the pool is 2-22cm larger than that of ordinary biogas digesters. Not only does the pool capacity reach 6-8 cubic meters, but it also helps to increase the pool temperature in winter and increase gas production. Rural household biogas digesters with a capacity of 6-8 cubic meters have a maximum daily biogas production of 1.5-1.8 cubic meters, an effective gas tank volume of 1 cubic meter is sufficient, and a glass steel digester volume of 2.02 cubic meters is fully capable of guaranteeing 6- 8 cubic meters of digester gas storage needs. The biogas digester with a capacity of 6-8 cubic meters is suitable for farmers with 3-5 pigs. If there are more than 5 pigs in stock, the effective volume of the gas tank will be occupied by excrement through repairing a larger-capacity digester or constructing double pools. , The problem of insufficient gas storage.

Third, the overall comparison of glass and steel gas digesters and glass fiber reinforced plastics. Although the overall FRP biogas digester is more convenient to construct, there are two problems: First, the overall cost of the FRP biogas digester is high. Due to the high price of FRP materials, the cost of the overall FRP biogas digester under the same volume is more than 30% higher than that of FRP arch biogas digesters. The second is that the integrated body of the glass-fiber digester is easily broken at the joints with the inlet and outlet pipes. After the digester feeds, due to its own weight, if the ground treatment is slightly false or uneven, the sinking of the pool is likely to occur, resulting in the joint of the pool body with the inlet and outlet pipe, and the bottom of the pool. It is easily broken by stones in the foundation. Therefore, the glass fiber reinforced plastic biogas digester is more mature than the overall glass steel biogas digester technology.

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