Multistage high-efficiency flash evaporation sludge dewatering treatment system and method thereof

Abstract

The invention discloses a multistage high-efficiency flash evaporation sludge dewatering treatment system and a method. The utilization problem of sludge pyrolysis multistage flash evaporation secondary steam is solved in the invention. The system comprises a pretreatment unit, a boiling unit, a multistage flash evaporation unit and a dewatering and backmixing unit, the pretreatment unit comprises a mixer for mixing the sludge through a rotor pump, the boiling unit comprises a heater connected with the sludge mixer and a boiler connected with the heater, the multistage flash evaporation unit comprises a flash evaporation device and a heat energy recovery device for conveying steam in the flash evaporation device to the heater, the dewatering and backmixing unit comprises a screw dewaterer for conveying separated water to the sludge mixer through a reuse water pump, the screw dewaterer is connected with a secondary flash evaporation device. The method sequentially comprises: sludge mixing, heating treatment, continuous flash evaporation and dewatering separation. The system and the method are adopted to recover the flash evaporation secondary steam, so the heat energy utilization rate in the sludge treatment process and the reliability of a sludge treatment device are increased.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a multistage high-efficiency flash sludge dehydration treatment system and method. Background technique [0002] Before the 1980s, natural drying was mainly used for sludge dewatering. With the development of urbanization, the sludge production has increased sharply, and attention has been paid to the dehydration treatment of sludge. Mechanical dehydration has gradually replaced natural drying as the main sludge dewatering method. In recent years, my country's sewage treatment plants have set up relatively complete sludge dewatering facilities, getting rid of the initial drying field and drying pond, but mechanical dehydration still occupies a dominant position. The composition and structure of sludge are complex, and mechanical dehydration is directly carried out. Often do not achieve the expected processing effect. Although new technologies such as electro...

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Problems solved by technology

[0005] The invention provides a multi-stage high-efficiency flash sludge water treatment system, which solves the problem of utilizing the secondary steam of the sludge pyrolysis multi-stage flash, and realizes the heat recovery and utilization of the secondary flash through the heat energy recovery device, and The digester ensures the sludge treatment time, and with the supporting computer automatic control system, the sludge hydrothermal drying treatment can realize automatic operation

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