Abstract
The technological process, technical parameters, operation cost and effect of zero discharge project for desulphurization wastewater of 1000MW coal-fired unit in East China are analyzed. The project mainly adopts the process of softening pretreatment, membrane concentration and evaporation crystallization, the direct cost of per ton water treatment is about ￥35.3, and the final product is high purity industrial salt. This technology fully realize the zero discharge requirement of desulphurization wastewater, and has good envir(can )tal and economic benefits.
Highlights
There are four 1000MW coal-fired units in a large thermal power plant in East China, which are the first stage of 2 × 1000MW ultra-Supercritical primary reheat unit and the second stage of 2 × 1000MW ultra-Supercritical secondary reheat coal-fired unit
The first phase of the power plant project is equipped with a set of desulphurization wastewater treatment facilities, according to the waste water design of 4 × 1000MW unit, the design output is 65.5m3/h
The zero discharge treatment process of desulphurization wastewater is shown in figure 1, which is mainly composed of softened pretreatment, membrane concentration and thermal vapor recompression (TVR) evaporation crystallization unit
Summary
There are four 1000MW coal-fired units in a large thermal power plant in East China, which are the first stage of 2 × 1000MW ultra-Supercritical primary reheat unit and the second stage of 2 × 1000MW ultra-Supercritical secondary reheat coal-fired unit. In order to realize the zero discharge of desulphurization wastewater in the real sense, the power plant carried out the zero discharge treatment project of desulphurization wastewater synchronously during the construction of the second phase of the project. According to the calculation of coal quality and desulphurization process water quality of the unit, the desulphurization waste water of the first stage unit is 19 m3/h, and that of the second stage unit is 20.4 m3/h, the total amount of desulphurization waste water is 39.4m3/h.
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