High-temperature and high-pressure steam dehydration system and method for domestic waste

Abstract

The invention relates to a high temperature and high pressure steam dehydration system and method for household garbage, and belongs to the technical field of household garbage burning pretreatment. The method is characterized in that household garbage is subjected to a reaction at a certain time under the saturated vapor pressure action of a certain pressure, free water in garbage components is separated, the household garbage is discharged in an instant discharge mode under pressure after the reaction is finished, the household garbage in the discharging process is subjected to flashing, puffing and crushing, the free water in individual tissues is separated, the garbage is further dehydrated, the dehydrated garbage is subjected to incineration treatment, and liquid waste which is generated after dehydrating is subjected to anaerobic methane treatment. The household garbage household garbage steam dehydration system and method provided by the invention have the advantages that bound water of the household garbage is changed into the free water among particles, the moisture contained in the garbage are separated through gravity settling, the garbage heat value is greatly increased, the methane generated by anaerobic digestion can provide heat energy supplies such as steam, and the resources recycling is guaranteed.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure steam dehydration system and method for domestic garbage, which are used to realize the water reduction of urban domestic garbage and belong to the field of domestic garbage treatment. Background technique [0002] Incineration treatment is a fast and effective technical method to achieve waste reduction. However, domestic waste in China has a high moisture content and low calorific value. The mixed waste feed makes it difficult to control the burning speed and burning time during the incineration process, which seriously affects the incineration efficiency. Moreover, it is not easy to control the emission of harmful substances such as sulfur dioxide, carbon monoxide, and hydrogen chloride, especially incomplete combustion products, organic groups, and chlorine-containing substances such as hydrogen chloride generated when the combustion is insufficient. Dioxin-like substances. Therefore, h...

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Problems solved by technology

[0003] Some cities in China are also exploring ways and means to solve these problems. One is to use the method of source classification to sort out combustible substances, but the effect is not satisfactory due to the mismatch of domestic waste sorting back-end treatment and disposal facilities; the other is Using the incineration pretreatment process, some domestic incineration plants basically use the method of simple stacking and direct screening in the plant to reduce the moisture content. Although the calorific value can be increased to a certain extent, it has not fundamentally solved the problem of unstable calorific value and incombustibility of waste. Complete problem, and easy to cause secondary pollution of the environment

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