Desulfurization waste water zero-discharging treatment technology for coal-fired power plants
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A technology for desulfurization wastewater and treatment process, which is applied in the fields of water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. The effect of reducing operating costs
Inactive Publication Date: 2016-01-20
中国能建集团装备有限公司南京技术中心
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[0013] 3. The current conventional treatment process
[0019] In recent years, large international water treatment companies (such as GE, Veolia, McWong, Arquette, etc.) have proposed their own "zero discharge" process for zero discharge of power plant wastewater, and the main process is pretreatment-evaporation-crystallization process; At present, the vast majority of power plants only achie
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Embodiment 1
[0053] The desulfurization system of a 600MW ultra-supercritical unit in a power plant shares a comprehensive wastewater treatment system with automatic control function. The wastewater treatment volume is about 12t / h, and the circulating cooling water is planned to be reused. Excess indicators in wastewater are mainly suspended solids, pH value, mercury, copper, lead, arsenic, fluorine, calcium, magnesium, aluminum, iron, and chloride, sulfate, sulfite, carbonate, etc. Dosing regimen is as follows:
[0054]
[0055] The effluent quality of each relevant treatment process is as follows:
[0056]
Embodiment 2
[0058] The desulfurization system of a 300MW ultra-supercritical unit in a power plant shares a comprehensive wastewater treatment system with automatic control function. The wastewater treatment volume is about 6t / h, and the circulating cooling water is planned to be reused. Excess indicators in wastewater are mainly suspended solids, pH value, mercury, copper, lead, arsenic, fluorine, calcium, magnesium, aluminum, iron, and chloride, sulfate, sulfite, carbonate, etc. Dosing regimen is as follows:
[0059]
[0060] The effluent quality of each relevant treatment process is as follows:
[0061]
Embodiment 3
[0063] The desulfurization systems of two 2×600MW ultra-supercritical units in a power plant share a comprehensive wastewater treatment system with automatic control function. The wastewater treatment volume is about 24t / h, and the circulating cooling water is planned to be reused. Excess indicators in wastewater are mainly suspended solids, pH value, mercury, copper, lead, arsenic, fluorine, calcium, magnesium, aluminum, iron, and chloride, sulfate, sulfite, carbonate, etc. Dosing regimen is as follows:
[0064]
[0065] The effluent quality of each relevant treatment process is as follows:
[0066]
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Abstract
The invention provides a desulfurization waste water zero-discharging treatment technology for coal-fired power plants. The desulfurization waste water zero-discharging treatment technology comprises a pretreatment system, a membrane process distillation system, a fresh water reuse and purification system, a concentrate water recovery and evaporative crystallization system and a sludge treatment system. The pretreatment system comprises the processes of pH adjustment, first-stage precipitation, coagulation and second-stage precipitation. Waste water treated by the pretreatment system enters the membrane process distillation system, and discharged sludge enters a sludge treatment system. One side of a membrane assembly in the membrane process distillation system is the cooling side and is in a negative pressure state. The waste water evaporates on the membrane surface and passes through the cooling side of the membrane surface in the form of vapor, and then the vapor coagulates into fresh water and enters the fresh water reuse and purification system, so that fresh water is reused by power plants and other relevant water-consuming systems. The other side of the membrane assembly is the heating side, and waste water not passing through the membrane surface forms concentrate water and enters the concentrate water recovery and evaporative crystallization system, so that resource utilization of concentrate water is achieved. Thus, desulfurization waste water zero discharging is realized.
Description
technical field [0001] The invention relates to a zero-discharge treatment process for desulfurization wastewater in a coal-fired power plant. Background technique [0002] my country is a country that mainly burns coal. At present, more than 62% of the cities in the country are SO 2 The concentration exceeds the second-level standard of national environmental quality, and the area accounting for about 40% of the country's area is affected by SO 2 Acid rain pollution caused by massive discharge, so control of SO 2 pollution is inevitable. Flue gas desulfurization is currently the only desulfurization method for large-scale commercial application in the world. 2 The main technical means of pollution. SO 2 The concentration is low, and the technical difficulty is relatively high [11]. [0003] Among all the desulfurization technologies, the wet flue gas desulfurization technology is mature, with high desulfurization efficiency, good adaptability to coal types, and reliab...
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