Soft biomethane digester

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A soft-type biogas digester is a foldable biogas digester, and it represents a new type of biogas equipment. It mainly includes: flexible foldable biogas fermentation bags, biogas storage bags, biogas pressure boost pumps, desulfurizers, water separators, biogas delivery pipes, and related fittings. The main component of the device is a flexible, foldable biogas fermentation bag, which is made from high-strength plastic material (double-sided PVC with mesh fabric or high-quality PVC tensile film) through high-frequency heat sealing, and is equipped with air outlet holes as well as inlet and outlet ports for materials. Biogas digesters have low pressure, so the requirements for leak prevention are not high. Choose a low-pressure stove, or use heavy objects such as sandbags to apply pressure to the gas storage bag, or employ a pressure booster pump to increase the gas delivery pressure. http://www.dtrzq.com/uploadfile/20110212/20110212115039897.jpg http://www.dtrzq.com/uploadfile/20110212/20110212115100722.jpg The fermentation raw materials used are sourced from various places; a large amount of household waste can be converted into gas at extremely low costs, enabling the reuse of resources and turning waste into treasure. This approach addresses environmental pollution issues and can be considered a green project that benefits both the country and its people, bringing advantages to all of humanity. Currently, the goal of biogas technology has shifted from \"energy recovery\" to \"environmental protection.\" The use of biogas is no longer limited to lighting and cooking; it has evolved to include centralized gas supply in rural areas as well as biogas power generation. Moreover, comprehensive utilization of biogas residues and liquids has been pursued, giving rise to ecological development projects that enhance people’s livelihoods by leveraging biogas. These efforts encourage farmers to change their traditional ways of living and producing, thereby improving their quality of life. With the leadership and support of various ministries, provincial and **-level specialized organizations for biogas have been established, creating a technical management and service system for rural energy development. Training has also been provided for personnel involved in biogas technology, management, and maintenance, thereby ensuring the progress of the biogas sector. The development of rural biogas has received great attention from the ****, the State Council, and local Party committees at all levels. People from all sectors of society as well as the vast number of farmers consider rural biogas projects to be energy projects that help build a resource-conserving society, ecological projects that support the sustainable development of agriculture, projects that increase farmers’ incomes and improve their living standards, as well as projects that enhance rural living conditions and serve the interests of farmers. http://www.dtrzq.com/uploadfile/20110212/20110212115317886.jpg http://www.dtrzq.com/uploadfile/20110212/20110212115355506.jpg Introduction to Performance Features] 1. Economical and durable, with low costs and minimal investment; it yields quick results. The equipment is resistant to freezing temperatures (-25°C), intense sunlight (50°C), lightning, earthquakes, aging, corrosion, and leakage. When installed in a completely enclosed environment free from any human or external damage, it can be used continuously for 8–12 years. Its price is only one-third that of cement-cast and fiberglass biogas digesters, and it is spreading rapidly in rural areas across the country. Apart from the one-time purchase of equipment, subsequent investment is almost zero. Based on preliminary calculations, the maximum installation cost for an 8-cubic-meter unit of this technology that can be used for over 8 years is no more than 1,200 RMB, a price that is affordable even for residents in the economically underdeveloped areas of western China. When the user installs this device, after putting the fermentation material into the fermentation bag, gas can be used within 24 hours in summer, and within 96 hours in spring and autumn. By comparing the biogas produced at that time with purchased gas and making an adjusted calculation, it is possible to recoup the total cost of investing in such equipment. 　　II. It is lightweight, foldable, and compact, making it easy to transport and carry; it can be moved and installed anywhere. The entire set of equipment weighs only about 10-20 kilograms, making it easy to transport. Furthermore, this device can be moved and installed anywhere; if the user moves to a new home, the device can be taken away and installed elsewhere. 　　III. It is simple and quick to install, and the depth of the pit can be chosen arbitrarily according to the user’s requirements. The main body of the device (the collapsible biogas fermentation bag made of flexible material) is constructed from high-strength plastic materials, offering high mechanical strength and ductility. Its installation is not restricted by any geographical conditions; it can be placed on a standard foundation such as existing manure pits in rural areas, stairwells in townhouses, or even in a soft soil pit. Even if external forces cause the foundation of the fermentation tank to shake or deform, the device will still function normally without being affected. 　　IV. No mixing is required, and gas production is high. The fermentation tank has a dark color and can be placed outdoors to facilitate the absorption of solar energy; this results in higher temperatures inside the tank and a higher gas production rate. A plastic biogas tank with a volume of about 6 cubic meters can produce as much gas as a pressure-type biogas tank with a volume of 10 cubic meters. This type of biogas digester has significant advantages in areas with high temperatures; in northern regions, it can be used in solar greenhouses during winter. Furthermore, since the tank body is made of high-strength flexible material, it has excellent tear resistance; pressure and vibration can be applied from above the tank at any time, without the need for stirring, which causes the floating substances on the liquid surface within the fermentation tank (i.e., the crusty areas) to sink below the liquid level. This solves the problem of crust formation in the fermentation material within the tank, which can affect gas production. Furthermore, the fermentation material fed in at any time ferments under completely sealed conditions; as a result, for the same amount of fermentation material, this equipment enables a gas production rate that is 20–30% higher compared to traditional biogas plants with the same tank capacity. 　　V. The fermentation raw materials used have a wide range of sources: these materials are typically household waste and agricultural residues, such as discarded crop straws in rural areas and manure from humans and animals ； Peels from fruits and vegetables, feces, dishwater, bathwater from urban residents ； Waste from food processing plants, residues from the food service industry, etc ； For ordinary farmers, raising three pigs or more is sufficient to meet their gas needs for daily use. 　　VI. Using this device is very safe: the fermentation chamber of this device is made of plastic material and can withstand gas pressures of over 10 KPa. In normal operation, the pressure inside the fermentation chamber’s gas tank remains within the range of 4 KPa to 5 KPa; if the pressure exceeds 5 KPa, the excess gas is discharged automatically through the outlet. Therefore, users need not worry about the risks of high pressure and explosiveness, as is the case with natural gas, gas, or liquefied gas, when using it. On the other hand, since the fermentation tank of this device is made of a flexible material and its depth can be adjusted arbitrarily (usually ranging from 0.6 to 1.2 meters), it is not necessary for workers to enter the tank to clean it, remove the contents from it, or carry out maintenance on the tank, which thus prevents methane poisoning incidents. 　　VII. Health and environmental protection: Since this product is itself a purification device for handling household waste, and its entire fermentation process takes place in a completely sealed environment, it causes no pollution to the surrounding area ； When the device is operating properly, the biogas slurry that flows out through the automatic discharge port at any time meets all **discharge standards. The purified biogas slurry can be used for growing vegetables, watering various crops and other plants, as well as for raising pigs. 　　VIII. It is easy to use and maintain, readily understandable by ordinary people and easy to popularize: no high level of professional knowledge is required; it can be understood at a glance, and anyone with a basic primary school education can learn to use it. In the event that the device is damaged by sharp objects or as a result of human interference, the user does not need to turn to the distributor or manufacturer; they can carry out repairs and troubleshoot the issues on their own. Wipe the damaged area clean with a cleaning cloth, and then repair it by sticking a piece of material identical to that of the pool body over the damage (use PVC adhesive). 　　IX. Easy for industrial production and commercial operation: Since the main components (biogas fermentation bags and biogas storage bags) are made of plastic materials, they can be easily prefabricated on an industrial scale. For commercial use, they can be folded and packaged such that a set designed for 4 to 6 people, with a volume of 6 to 8 cubic meters, has a packaged volume of no more than 0.2 cubic meters and a gross weight of no more than 20–30 kilograms.