Double circulation U-shaped tower desulfurization system and process

Abstract

The invention discloses a double circulation U-shaped tower desulfurization system and a process. According to the double circulation U-shaped tower desulfurization system, a slurry separation wall is arranged in a slurry pond of a U-shaped desulfurization tower to divide the slurry pond into a front circulation neutralization and oxidization pond and a rear circulation neutralization and oxidization pond, and meanwhile, a front circulation desulfurization region and a rear circulation desulfurization region which are mutually independent are arranged, wherein a front circulation desulfurization system is jointly formed by the front circulation neutralization and oxidization pond, a front circulation pump and the front circulation desulfurization region, and a circulation desulfurization system is jointly formed by the rear circulation neutralization and oxidization pond, a rear circulation pump and the rear circulation desulfurization region; and the double circulation desulfurization system which is relatively independent is formed in the U-shaped desulfurization tower, and the desulfurization of smoke is jointly finished by the double circulation desulfurization system. According to the double circulation U-shaped tower desulfurization system, higher desulfurization efficiency is not only guaranteed, but also the slurry circulation quantity and the system energy consumption are reduced, the height of the desulfurization tower is also reduced due to the overall layout of the U-shaped desulfurization tower, and the double circulation desulfurization system is simplified. The double circulation U-shaped tower desulfurization system is particularly suitable for desulfurizing smoke generated by burning high-sulfur coal, and the desulfurization efficiency can reach higher than 99 percent.

Description

technical field [0001] The invention relates to a flue gas desulfurization technology, in particular to a double-cycle U-shaped tower desulfurization system and process. Background technique [0002] SO 2 The emission limit value has been greatly improved, and the general requirement is 100mg / N m 3 Within local area, 50mg / Nm is required 3 . [0003] The current single-cycle desulfurization tower system is mainly operated in medium and low-sulfur coal areas, which can fully meet the emission requirements. For some high-sulfur coal areas, the desulfurization efficiency is required to reach more than 98%, or even more than 99% to meet the emission requirements. To meet the emission requirements using a single-cycle desulfurization tower system, the desulfurization tower will be very high, and the energy consumption will be relatively high. Sometimes One desulfurization tower has to be divided into two desulfurization towers to operate in series, but the two desulfurization...

AI Technical Summary

Problems solved by technology

For some high-sulfur coal areas, the desulfurization efficiency is required to reach more than 98%, or even more than 99% to meet the emission requirements. To meet the emission requirements using a single-cycle desulfurization tower system, the desulfurization tower will be very high, and the energy consumption will be relatively high. Sometimes It is necessary to divide one desulfurization tower into two desulfurization towers to operate in series, but the two desulfurization towers in series occupy an area and the investment is very large, which is not conducive to efficient and economical operation

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