Single-column dual-cycle efficient desulfurization process system and method

Abstract

The invention relates to a single-column dual-cycle efficient desulfurization process system. The system comprises a main absorption tower, a main slurry tank and an auxiliary slurry tank, wherein a flue gas inlet is formed in one side of the lower part of the main absorption tower, and a flue gas outlet is formed in the upper part of the main absorption tower; a gypsum slurry oxidizing slurry tank is arranged at the bottom of the main absorption tower as the main slurry tank; and two absorption regions including a main cycle spraying region and an auxiliary cycle spraying region are arranged in a spraying region of the main absorption tower. The single-column dual-cycle efficient desulfurization process system has the characteristics and beneficial effects that spraying slurry of the main spraying region and the auxiliary spraying region absorbs SO2, absorbed and fused SO2 is strengthened by virtue of mass transfer components arranged between the main spraying region and the auxiliary spraying region, and finally the pH value of the mixed slurry is 4.5-5.0, so that calcium sulfite in the slurry of the main slurry tank is helped to be oxidized into calcium sulfate by virtue of forced-oxidation air and finally crystallizes to form gypsum, and the gypsum slurry is discharged by virtue of a gypsum discharging pump.

Description

technical field [0001] This patent relates to the field of limestone-gypsum wet desulfurization, and specifically relates to a single-tower double-cycle high-efficiency desulfurization process system and method. Background technique [0002] In recent years, the state and local governments have continuously issued a number of policies, requiring coal-fired power plants to step up the implementation of ultra-low emissions, among which SO 2 The emission concentration needs to be as low as 35mg / m 3 Below, in order to meet the new environmental protection requirements, it is urgent to further control the flue gas SO of coal-fired units. 2 emissions and improve desulfurization efficiency. However, the current conventional single-tower single-cycle spray desulfurization system is difficult to meet the requirements. [0003] Many units have developed processes such as double-tower double-cycle desulfurization and single-tower double-cycle desulfurization. Among them, double-towe...

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Problems solved by technology

However, the current conventional single-tower single-cycle spray desulfurization system is difficult to meet the requirements

[0003] Many units have developed processes such as double-tower double-cycle desulfurization and single-tower double-cycle desulfurization. Among them, double-tower double-cycle desulfurization needs to arrange two absorption towers, which are operated in parallel or in series, and have high requirements for the layout site. Many power plants The site around the original absorption tower is difficult to meet the layout requirements of the twin towers

Single-tower double-circulation desulfurization is basically the structure type of the main absorption tower and the auxiliary slurry tank. A modified spray layer is added on the upper part of the spray layer of the original absorption tower. The sprayed slurry needs to be collected in the auxiliary slurry tank outside the tower; It solves the problems that the upper spray section of the main absorption tower needs to add more space to the slurry collection device, resulting in a waste of space in the absorption area and a large amount of renovation work

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