Manufacturing method of pollution-free coal with high combustion value by household garbage

Abstract

The invention relates to a manufacturing method of pollution-free coal with a high combustion value by household garbage. The manufacturing method specifically comprises the following steps: S1, conveying garbage from dispersing points to a garbage storage area; S2, conveying the garbage from the garbage storage area to a reaction kettle automatically or manually, and completely sealing the reaction kettle; S3, introducing steam into the reaction kettle and dynamically controlling time-dependent temperature and pressure of the garbage to form a carbonized mixture; S4, reducing the temperature and pressure in the reaction kettle and discharging liquefied water and gases formed in reaction; and S5, pouring the carbonized mixture formed in the step 3 into a screening device which screens incombustible matters out of the carbonized mixture, and finally obtaining the carbide. The manufacturing method provided by the invention is pollution-free in processing process and low in processing cost, and the prepared garbage coal is high in combustion value and low in emission.

Description

technical field [0001] The invention belongs to the technical field of domestic waste treatment, and in particular relates to a method for producing coal with high combustion value and no pollution by using domestic waste. Background technique [0002] According to data, the average annual growth rate of domestic waste in my country is 8%-10%. In 2013, the urban domestic waste reached 260 million tons, and the annual domestic waste in rural areas was also nearly 100 million tons. The increasing domestic waste has become a problem that plagues economic development and the environment. major issues of governance. In this regard, the national and local governments at all levels attach great importance to it. In recent years, our country has introduced a series of new policies and new plans to make a comprehensive policy and practical explanation of the waste disposal problem. Especially during the "Twelfth Five-Year Plan" period, the state has The formulation of major plans in t...

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Problems solved by technology

[0014] 2. Combustion residue still needs landfill

Because the residue contains heavy metals and other harmful substances, the treatment technology requires high requirements, the treatment equipment is complex, and the treatment cost is high. If some incineration plants cannot completely detoxify the residue or do not treat it thoroughly, this will cause damage to the soil and groundwater. serious pollution

[0016] 3. High investment with little economic return

[0021] Garbage sorting and composting is to use the ability of microorganisms to decompose the organic matter in the garbage into inorganic nutrients. After composting, it will become crop fertilizer, and the inorganic metal objects, glass, bricks, etc. will be landfilled. Plastics, etc. are recycled; however, the amount of composting of domestic waste is large, and the content of nitrogen and phosphorus is low. Long-term use will easily cause soil compaction and groundwater quality to deteriorate. At the same time, it also has the following outstanding problems: 1. Odor pollution; 2. High operating costs ; 3. The technology is immature; 4. The factory management is poor, so the garbage sorting and composting technology is not yet mature

[0022] A search of existing technologies found that the patent name is "Method of Manufacturing Environmentally Friendly Recycled Coal Using Garbage, Straw and Sludge", and the application number is 201310672617.3 Chinese invention patent. In this patent, garbage, straw, and sludge are mixed according to weight ratio The environmentally friendly recycled coal is mixed in the feeder, but the physical method used in the processing process does not change the quality of the raw materials, and the coal generated by it has a low combustion value. At the same time, the pretreatment link in the manufacturing method requires manual sorting and classification. The production method Traditional, it is difficult to promote industrialization and large-scale application; the patent name is "New Household Garbage Environmentally Friendly Recycled Coal Manufacturing Method and Its Products", and the application number is 201210076821.4. The Chinese invention uses domestic waste to prepare recycled coal, but a large amount of chemicals need to be added in the preparation In addition, there are also examples of using garbage as fuel for power generation and gas production in my country, but the investment is large, the cost is high, and the harmless treatment is not perfect, resulting in secondary pollution, and some of them need to be mixed with Injecting a large amount of raw coal or coal liquid will eventually lead to losses outweighing the gains

[0023] In summary, there is no truly scientific, efficient, and non-polluting method for waste disposal in the prior art, and there is no production that can turn waste into coal with high combustion value and no secondary pollution at low cost and without pollution. technology

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