Preliminary preparation system for preparation of biogas from domestic garbage, and preliminary preparation method for biogas

Abstract

The invention discloses a preliminary preparation system for preparation of biogas from domestic garbage. The preliminary preparation system comprises a pretreatment device, a storage and transportation device, a pulverizing device, a fermentation device and a storage device. The pretreatment device is completely enclosed so as to form an anoxic environment to facilitate the activities of anaerobic bacteria; the pH value of the domestic garbage is pre-adjusted before biogas production, so the recycling degree of the garbage is greatly improved; and the pretreatment device is simple in structure, thorough in treatment, low in cost, short in investment return period, high in energy utilization rate and capable of saving living fuel and electricity cost by recycling the garbage for biogas preparation, has good application prospects and contributes to environmental protection. The storage device is provided with a U tube and a disinfectant tank; the biogas enters disinfectant liquid through the U-tube, and then the biogas rises, so poisonous gas doped in the biogas is allowed to be dissolved in the disinfectant liquid, the disinfectant liquid is prevented from affecting the use of other devices due to its backflow, and clean and hygienic biogas is provided.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, and in particular relates to a preliminary preparation system for biogas production from domestic garbage. Background technique [0002] my country is the country with the highest output of urban waste in the world. The annual output of urban domestic waste has exceeded 1.114 billion tons, accounting for more than 11 / 14 of the world's total, and it is still growing at a rate of 18-110% every year. The increasingly serious pollution of domestic waste to the urban environment is bound to become a major social problem that the government attaches great importance to and solves. With the changes in urban environmental sanitation and management methods, the management of urban domestic waste in my country is also developing from simple end treatment to source treatment and comprehensive management. In recent years, through national appropriation and local government financing, many landfill...

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Problems solved by technology

[0003] The existing technology has the following problems: 1. Due to the variety of domestic waste, the pH cannot be determined. Second, biogas fermentation generally needs to maintain the pH at 17 to 18.15. Direct fermentation without pretreatment will affect the gas production rate; 2. Garbage collection and storage 3. Domestic waste often has a high water content, which affects the crushing effect, and the concentration of the permeate is high, making it difficult to crush when crushing. And it is easy to block the machine and the crushing is insufficient; 4. It is difficult for anaerobic fermentation equipment to control the pH value of the reaction area during the fermentation process, resulting in the rate of anaerobic fermentation not always being kept at the best state; Hydrogen also contains a large amount of dust. Dust entering the desulfurization and dehydration equipment will easily damage the internal parts of the machine and shorten the service life of the machine. Most of the existing biogas biological dehydration and desulfurization equipment are equipped with dust removal devices, but the existing dust removal devices are simple in structure design , the effect of filtering dust is poor, and the filtration of fine dust is mostly incomplete; 6. In the use of reagents, the pressure of the biogas pipeline is insufficient, the combustion is not sufficient, the use is inconvenient, and it is difficult to meet the needs of life and production; Biogas resources, such as domestic waste, crop straw, etc., but most of the existing domestic waste biogas purification treatment devices adopt a fixed structure, which is complex in structure and high in production costs, and is only suitable for small and medium-sized domestic waste treatment plants for biogas purification operations. It is suitable for biogas purification in rural areas; 8. The preservation tank is heavy after being inflated, and there are no rollers to make it difficult to carry. At the same time, there is no fixed plate on the side of the storage tank, and it is easy to cause rolling when lying down

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