Preparation system for marsh gas prepared from domestic garbage and marsh gas preparation method thereof

Abstract

The invention discloses a preparation system for marsh gas prepared from domestic garbage. The preparation system comprises a pretreatment device, a storage and conveying device, a crushing device, afermentation device, a storage device, a desulfurization and dewatering device, a pressurization treatment device, a purification treatment device and a storage tank, wherein the pretreatment device is integrally sealed to create an anoxic environment, which is facilitated to the activity of anaerobic bacteria; before the marsh gas preparation, the pH value of the garbage is regulated in advance;the resource degree of the garbage is greatly improved; the equipment is simple; the treatment is thorough; the cost is low; the investment return period is short; the energy utilization rate is high;garbage is used for preparing the marsh gas, so that waste materials are utilized; the life fuel and electric charge can be saved; wide application prospects are realized; contribution is made for environment protection; the storage device is provided with a U-shaped pipe and a sterilization liquid box, so that the marsh gas enters sterilization liquid through the U-shaped pipe; then, the gas ascends, so that toxic and harmful gas mixed in the marsh gas is merged in the sterilization liquid; meanwhile, influence on the use of other devices due to the backflow of the sterilization liquid is avoided; clean and sanitary marsh gas is provided.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, and in particular relates to a biogas preparation system 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 landfills have been built in variou...

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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 desu

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