The structure of the dual-membrane biogas gas storage tank is simple and does not require too much maintenance. The membrane materials are made of imported corrosion-resistant environmentally friendly special composite materials. They are mainly composed of high-strength tensile fibers, air-tight anti-corrosion coating, and surface coating (PVDF). They have anti-corrosion, anti-aging, anti-microbial and ultraviolet functions, and the fire protection level reaches European standards. At the same time, the outer membrane has a self-cleaning function. Gas tanks are composed of bottom membrane, inner membrane, outer membrane, and some control equipment and auxiliary materials. The main features of the dual-membrane constant-pressure biogas storage tank are high: the gas utilization rate in ordinary solid gas tanks is generally only half, and generally all the gas cannot be extracted. The dual-membrane biological biogas storage cabinet is made of flexible material that can be folded and can squeeze out all the gas in the tank, with a utilization rate of 100%. Less investment: Less area. Used as dry gas storage, it can be built directly on the ground and has a beautiful appearance. Long corrosion resistance life. The main component is a special flexible membrane for corrosion resistance, which does not require anti-corrosion treatment and anti-freezing in winter. Special materials are used, and the life span can reach 15-20 years. The inner membrane has the ability to corrode and various microorganisms. Conditions permit PTFE material can be used, and the life span can reach 50 years. Automatic constant pressure output: The dual-membrane biological gas storage tank is equipped with an automatic control system, which inflates or deflates the pressure in the pressure regulating chamber to adjust the varicosity of the biogas membrane to adjust the pressure and stabilize the building structure. High safety: The inner membrane is always in pressure balance and will not leak stored gas. Even if a small amount of gas leaks from the outer membrane, the leaked gas will only be air, and there is no safety threat. Equipped with both electronic and physical safety valves and overpressure alarms, overpressure leaks will never occur. Equipped with various alarm systems and gas leak inspection systems. Convenient installation, light weight, low infrastructure requirements, low construction cost, short installation period, convenient disassembly and maintenance. The product is light in weight, foldable and easy to transport, with constant outlet biogas pressure, large inlet/outlet biogas flow, and wide application range.