Dual-circulation single-tower desulfurization systems and process thereof

Abstract

The invention discloses dual-circulation single-tower desulfurization systems and a process thereof. A liquid collecting disc arranged in a desulfurization tower divides a desulfurization area into an upper circulation desulfurization area and a lower circulation desulfurization area. The lower circulation desulfurization area, a lower circulation neutralization oxidation pond and a lower circulation pump altogether form a lower circulation desulfurization system. The upper circulation desulfurization area, an upper circulation neutralization oxidation pond and an upper circulation pump altogether form an upper circulation desulfurization system. The dual-circulation desulfurization systems which are relatively independent are formed in the desulfurization tower, and desulfurization of flue gas is completed by the two dual-circulation desulfurization systems together. The dual-circulation single-tower desulfurization systems which operate relatively independently are arranged within one desulfurization tower, so that high desulfurization efficiency is guaranteed, and the slurry circulation amount and the system power consumption are reduced, besides, the integral arrangement of the single tower reduces the occupied area and saves investment. The dual-circulation single-tower desulfurization systems are particularly applicable to desulfurization of flue gas produced by burning high sulfur coal, and the desulfurization efficiency can achieve more than 99%.

Description

technical field [0001] The invention relates to a flue gas desulfurization technology, in particular to a double-cycle single-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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