Integrated system for smoke purification white elimination and desulfuration wastewater treatment

Abstract

The invention discloses an integrated system for smoke purification white elimination and desulfuration wastewater treatment. The system comprises a heat exchange medium circulation system, the heat exchange medium circulation system comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is arranged in an absorption tower and / or a smoke purification flue, and the second heat exchanger is arranged in a desulfuration wastewater treatment tower; the first heat exchanger and the second heat exchanger are communicated, a heat exchange medium and smoke passing throughthe first heat exchanger conduct heat exchange in the absorption tower and / or the smoke purification flue so that smoke can be cooled and condensed, and the heated heat exchange medium and desulfuration wastewater spraying liquid drops passing through the second heat exchanger conduct heat exchange in the desulfuration wastewater treatment tower so that the desulfuration wastewater spraying liquid drops can be heated and evaporated into vapor. According to the integrated system, the existing white elimination environment-protection demand and wastewater zero-discharging environment-protectiondemand can be perfectly combined, the desulfuration wastewater treatment tower is used as a cold source device in a smoke condensation device during white elimination, wastewater treatment is achieved, and a new way is also provided for the cold source required by smoke condensation.

Description

technical field [0001] The present invention relates to the field of flue gas purification and waste water treatment, in particular to a method for flue gas purification fields such as thermal power plants, steel plants, paper mills, glass factories, chemical plants, etc., flue gas whitening and desulfurization waste water or other waste water treatment. Background technique [0002] Existing coal-fired tail gas must go through a series of environmental protection processes, such as denitrification, desulfurization, and dust removal. The current mainstream flue gas desulfurization technology is wet desulfurization. The flue gas after wet desulfurization is saturated wet flue gas, which will produce "white smoke" phenomenon when discharged from the chimney to the atmosphere, and wet desulfurization will produce desulfurization wastewater. The white smoke phenomenon can be solved by flue gas condensation and flue gas heating. At present, desulfurization wastewater generally ...

AI Technical Summary

Problems solved by technology

At present, desulfurization wastewater generally adopts the technical means of high-temperature evaporation, but this method has many disadvantages: 1. The problem of heat extraction is difficult. High-temperature evaporation needs to obtain heat from the high-temperature flue gas at the front end of desulfurization. It also needs to get heat from here, and there will be a problem of insufficient supply of high-temperature flue gas heat

2. Corrosion of evaporator materials. The evaporator of the high-temperature evaporation method basically uses metal materials, but the desulfurization wastewater contains a large amount of salt and corrosive substances, which will cause corrosion to metal equipment.

3. The cost is high. This method requires the manufacture of bulky heat extraction devices, evaporation devices and foundations. Taking a 600MW unit as an example, the total cost exceeds RMB 40 million or even higher

4 The energy consumption of the equipment is high, the operation of the equipment is unstable, and the problem of blockage and scaling is serious

Its structure and implementation are not conducive to flushing or cleaning. After running for a period of time, in addition to encountering corrosion problems, the equipment body will also have blockage and scaling problems

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