Wet oxidation treatment system and process for organic solid waste

Abstract

The invention discloses a wet oxidation treatment system and process for organic solid waste. The wet oxidation treatment system comprises a sludge storage tank, a pipeline type self-heat-exchange and reaction integrated assembly, a reaction sludge pressure storage tank, a mechanical dehydration unit, a sewage tank, a sludge pump and a water injection pump. According to the invention, sludge and process injected water can be mixed through the sludge pump, so hardening and tempering of a hardening and tempering tank in a traditional process are omitted; a pressure drop can be regulated and controlled through sludge-sludge heat exchange and a wet oxidation reaction of the pipeline type self-heat-exchange and reaction integrated assembly and by controlling the proportion of reaction gas reserved in the pipeline type self-heat-exchange and reaction integrated assembly; and the reaction mud pressure storage tank is used for storing a part of pressure energy of reaction mud and primarily settling the reaction mud, so the adjusting range of an adjusting valve can be reduced, the service life of the valve can be prolonged, the pressure energy can be used for dehydration of the reaction mud and reinjection tempering of supernatant, and thus, most of heat in a technological process is fully recycled, technological energy consumption is greatly reduced, a product can be recycled, and remarkable environmental protection and economic benefits are obtained.

Description

technical field [0001] The invention relates to the technical field of organic solid waste treatment, in particular to a wet oxidation treatment system for organic solid waste and a treatment process thereof. Background technique [0002] With the continuous advancement of my country's urbanization and the continuous improvement of environmental protection requirements, the treatment of organic solid waste, especially a large amount of municipal sludge, domestic garbage and kitchen waste, has received more and more attention. Organic solid waste refers to solid and semi-solid organic waste that pollutes the environment produced by humans in production and living activities. Organic solid waste generally includes municipal sludge, industrial sludge, kitchen waste, domestic waste, especially wet waste, River sediment, high-concentration organic waste liquid, feces, etc., and the sludge made of organic solid waste have similar chemical and physical properties to municipal sludg...

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Problems solved by technology

Therefore, there are two problems or deficiencies in the process: first, the energy of the discharged high-temperature and high-pressure gas cannot be recovered at a high level; However, the heat exchange effect of the heat exchangers currently on the market is poor, which often leads to the temperature of the sludge at the outlet of the heat exchanger higher than 110°C, some even higher than 140°C, and the pressure is greater than 1.0MPa. Therefore, the control valve In such a harsh process environment (high temperature and high pressure), it is easy to cause damage, and the valve needs to be replaced frequently, which also reduces the reliability and stability of the system.

[0005](3) The current wet oxidation process technology discharges the sludge after wet oxidation into the flash tank for cooling and pressure relief, and then transports it to the machine through the sludge pump The dehydration unit performs solid-liquid separation, which fails to make good use of the pressure energy carried by the sludge and reaction gas

[0007] (5) The current wet oxidation process technology mainly uses the intermediate medium (water or oil) circulation heat exchange technology to recover the heat of high-temperature sludge, that is, the heat of high-temperature sludge Transfer to low-temperature sludge needs to be transferred through the medium water or oil in the intermediate circuit, which increases the heat transfer resistance, leads to poor heat transfer effect, and relatively high process energy consumption

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