Concentrated solution drying system utilizing smoke waste heat to concentrate desulphurization waste water

Abstract

The invention relates to a concentrated solution drying system utilizing smoke waste heat to concentrate desulphurization waste water. The concentrated solution drying system comprises a flue heat exchanger, an evaporator group, a tail gas condenser, a tail gas condensation tank and a desulphurization waste water drying system, wherein a desulphurization waste water pipeline and a flue heater areconnected with the evaporator group, steam treated by the evaporator group successively enters the tail gas condenser and the tail gas condensation tank, and the desulphurization waste water concentrated solution treated by the evaporator group enters the desulphurization waste water drying system; the flue heat exchanger utilizes the smoke waste heat to heat the desulphurization waste water in the evaporator group; the evaporator group separates impurities from the desulphurization waste water in an evaporation manner; the tail gas condenser cools and condenses the evaporated steam; the tailgas condensation tank stores the condensed water and sends the condensed water into a finished product water tank; and the desulphurization waste water concentrated solution in the desulphurization waste water drying system is sprayed into a drying space to be mixed with flying ash to form solid powder to be collected. By adopting the concentrated solution drying system, no waste solid, waste water and waste gas is generated in the technological process, the condensed water evaporated by the waste heat of the smoke is completely recycled, the investment expense is low, and the maintenance costis low.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment in thermal power plants, in particular to a concentrated liquid drying system for concentrating desulfurization wastewater by using waste heat of flue gas. Background technique [0002] Limestone-gypsum desulfurization process (FGD) is the most widely used desulfurization technology in the world. About 90% of the flue gas desulfurization projects supporting coal-fired thermal power plants use this process. [0003] In the limestone-gypsum wet boiler flue gas desulfurization system of a large-scale thermal power plant, in order to ensure the desulfurization efficiency and maintain the balance of chloride ions in the system, part of the desulfurization wastewater needs to be discharged. Because the wastewater contains a large amount of dissolved salts, suspended solids, and a small amount of harmful pollutants such as fluoride ions and heavy metal ions, it cannot be disc...

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Problems solved by technology

[0005] (1) The amount of desulfurization wastewater is not large; however, the project occupies a relatively large area, and the process and equipment are complex

[0006] (2) The cost of engineering equipment and operating costs are high, which is difficult for power plants to accept

[0007] (3) Some ions with very little content, such as fluoride ions, are d

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