System and method for realizing zero discharge of desulfurization wastewater in virtue of carrier gas extraction and bypass flue evaporation

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a system for realizing zero discharge of desulfurization wastewater in virtue of carrier gas extraction and bypass flue evaporation. The system comprises a pretreatment integrated treatment system, a carrier gas extraction and concentration system and an evaporative crystallization and solidificationsystem. The invention also discloses a method for treating wastewater by using the system. According to the system and the method for realizing zero discharge of desulfurization wastewater in virtue of carrier gas extraction and bypass flue evaporation in the invention, defects in the prior art are overcome; and the whole system has the advantages of simple process, low requirements on raw water,low later maintenance cost, capability of being driven by a low-temperature heat source, insensitivity to temperature change and the like, can finally ensure that desulfurization wastewater is completely evaporated to dryness, serves as a terminal for wastewater treatment of a power plant, and truly realizes zero discharge of wastewater of the power plant.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a system and method for zero discharge of desulfurization wastewater from carrier gas extraction and bypass flue evaporation. Background technique [0002] At present, the three-box (physical and chemical method) desulfurization wastewater treatment process commonly used in China has the disadvantages of more equipment, large investment, high operating costs, and large equipment maintenance. These shortcomings have caused many power plants to install the above-mentioned desulfurization wastewater Processing devices, but in the actual operation process, there are situations of high operation and maintenance costs, high failure rate, and low commissioning rate. The three-box process needs to add a variety of chemicals to treat wastewater. The dosing system is too complicated, which affects the long-term stable operation of the system. In particular, the dos...

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Problems solved by technology

[0002] At present, the three-box (physical and chemical method) desulfurization wastewater treatment process commonly used in China has the disadvantages of more equipment, large investment, high operating costs, and large equipment maintenance. These shortcomings have caused many power plants to install the above-mentioned desulfurization wastewater Processing devices, but in the actual operation process, there are situations of high operation and maintenance costs, high failure rate, and low commissioning rate

The three-box process needs to add a variety of chemicals to treat wastewater. The dosing system is too complicated, which affects the long-term stable operation of the system. In particular, the dosing pipelines of lime milk, coagulant, and flocculant are often blocked, which greatly increases daily maintenance workload

[0004] The evaporation pond in the solidification treatment process is based on natural evaporation, which is simple and practical, but it is significantly affected by factors such as seasons and temperatures, and the processing capacity is obviously insufficient; the cost of the membrane concentration process is high, the equipment failure rate is high, and the floor area is large. Forward osmosis technology At present, there are few domestic researches, and the products still have problems such as low interception rate of some pollutants, large concentration polarization in the support layer, and high cost; although the mechanical atomization evaporation technology is low in cost and large in processing capacity, the wind blowing The salt pollution of the surrounding environment caused by the loss is the key to restricting its development; the evaporation concentration and crystallization technology uses hot steam to evaporate the waste water, the process system is complex, the investment and operation cost is high, and it is found in the actual operation process that the NaCl obtained by the salt separation process The quality of crystalline salt is not high, it contains some trace harmful elements, and has the potential to become a hazardous waste. Its economy and applicability need to be further evaluated

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