Waste water desulfurization method of thermal power generating unit by expansion membrane distilling technology
A technology for desulfurization wastewater, technical treatment, applied in the direction of separation method, multi-stage water treatment, water/sewage treatment, etc.
Inactive Publication Date: 2018-04-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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However, the impurities in desulfurization wastewater are completely different from other industrial wastewater from power plants, so they must be treated separately
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[0015] The accompanying drawings disclose non-limitative schematic diagrams of the waste water treatment process involved in the present invention, and the above solutions will be further described below in conjunction with specific implementation methods.
[0016] The main components of this system are 1. Peristaltic pump; 2. Heat exchanger; 3. Pressure gauge; 4. Vapor compressor; 5. Throttle valve; 6. Composite membrane; 1-stage expansion evaporator; 9. Three-stage expansion evaporator; 10. Crystallization pool.
[0017] The operation process of the system is as follows: firstly, the waste water discharged from the desulfurization system is introduced, and at the same time, the flue gas discharged from the boiler is introduced, and the waste water is heated by the flue gas to increase the temperature of the waste water while reducing the temperature of the flue gas. The quality heat is utilized while reducing the loss of processing flue gas.
[0018] After the wastewater is...
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The invention discloses a waste water desulfurization method of thermal power generating unit by expansion membrane distilling technology, and belongs to the waste water desulfurization treatment field of a coal-fired power plant. The system includes expanded evaporation treatment of waste water, hydrophobic crystallization and afterheat use of smoke gas. The desulfurized waste water is heated byresidual heat of smoke gas so that the waste gas reaches the demand of expanded evaporation; the waste water carries out the expanded evaporation and desulfurization, thus the waste water treatment standard is reached by low cost while the high-quality water resource is recycled, and the impurities are crystalized; a membrane device is applied to purify evaporated water, thus the utilization rateof the purified water resource is improved. The system comprehensively considers about smoke gas afterheat, desulfurized waste water, impurity crystallization, and use of composite film and other factors to steam purification, these aspects are organically combined, and the waste water is well treated on the basis of controlling cost; besides, the afterheat of smoke gas and other factors are utilized so that the energy utilization rate by the system is improved.
Description
technical field [0001] The invention belongs to the field of desulfurization wastewater treatment of coal-fired power plants, and in particular relates to the treatment of thermal power unit desulfurization wastewater by using expansion membrane distillation technology. Background technique [0002] my country is a country dominated by coal resources, and coal consumes the largest proportion of power consumption energy. Although the proportion of coal power in power energy is decreasing year by year, it can be foreseen that in the next few years or even decades, coal power will always be my country's largest energy source. The workhorse of the power industry. As environmental protection requirements become more and more stringent, the development of coal power in the future must follow a green and sustainable development path. The massive combustion of coal in thermal power plants will cause serious environmental problems, among which the emission of SO2, a combustion produc...
Claims
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IPC IPC(8): C02F1/16B01D53/22C02F103/18
CPCB01D53/229C02F1/043C02F1/048C02F1/16C02F2103/18C02F2001/5218C02F2209/03C02F2301/08C02F2209/40
Inventor 陈海平张衡黄吉光梁凯杨博然
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)