Non-discharge desulfurization and comprehensive utilization method for sea water

Abstract

The present invention relates to a comprehensive utilization method of sea water desulfurization without discharge, comprising the following steps: a booster pump is used to pumped the alkalescent sea water cooled and discharged by the condenser of a steam turbine in a power plant or a power station to an absorbing tower; in the absorption zone of the absorbing tower, the sea water absorbs and neutralizes acidic SO2 in smoke gas; in the oxidization zone of the absorbing tower, an iron SO3<2-> in the desulfurized sea water is oxidized into a stable iron SO4<2-> by oxidizing the air so as to restore the water quality of the sea water and improve the pH value of the sea water; after the above-mentioned process, the sea water is transferred by a mixing pool (a canal) to a salt field to obtain solar salt for further comprehensive utilization; the smoke gas free of SO2 passes through a defroster on the top of the absorbing tower to purify water fog and then is discharged by a chimney. The comprehensive utilization method of sea water desulfurization without discharge provided by the present invention has the advantages that: the alkalescent sea water is used as a desulfurizing agent so as to avoid secondary pollution such as additive, byproduct solid waste material, and the like; after the desulfurization, the sea water is comprehensively utilized without discharge; desulfurization efficiency is high; running cost is low; investment is small; and the system structure is simple.

Description

technical field [0001] The invention relates to a method for flue gas desulfurization by utilizing seawater without effluent, in particular to a method for comprehensive utilization of seawater desulfurization, wherein the seawater after desulfurization is regenerated and used to dry salt without effluent. Background technique [0002] At present, in my country's power structure, thermal power still occupies a dominant position, and the SO contained in the flue gas produced by the combustion of power plant or power plant boiler 2 It is the main cause of air pollution and acid rain. The seawater flue gas desulfurization process is simple, low investment, convenient operation and maintenance, only seawater and air are needed, no other additives are needed, fresh water is saved, and no waste is discharged. It is suitable for power plants or power plants near coastal areas, especially large coal-fired power plants. Therefore, using seawater to desulfurize flue gas is an economi...

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Problems solved by technology

[0003] However, the current seawater desulfurization process is relatively extensive and simple. Generally, after the sulfur dioxide-containing flue gas is absorbed by seawater, the seawater after absorbing sulfur dioxide is mixed with undesulfurized seawater, and then aerated in an aeration tank, and then directly discharged into the the sea

The disadvantage of this kind of process method is that seawater resources and lifting power are wasted, and the extensive aeration method cannot ensure the SO in desulfurized seawater. 3 2- The complete removal of ions, after being directly discharged into the sea, will cause pollution to marine life

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