Single-tower desulfurization ultra-clean treatment system and desulfurization process

Abstract

The invention relates to the technical field of flue gas desulfurization, and discloses a single-tower desulfurization ultra-clean treatment system and a desulfurization process, the single-tower desulfurization ultra-clean treatment system comprises a pre-absorption device and a desulfurization tower, and the pre-absorption device adopts spraying to pre-absorb flue gas; an absorption tower, a turbulent flow synergistic plate, a spraying layer, a slurry circulating pump, a synergistic dust removal device and a demister are sequentially arranged in the desulfurization tower from bottom to top; and the pre-absorbed flue gas enters the desulfurization tower through an absorption tower to finally finish desulfurization ultra-clean treatment. According to the invention, 20-30% of SO2 is captured after the flue gas is pre-absorbed and washed, and the reduction of the temperature and the concentration is more beneficial to the absorption of the subsequent absorption tower; and in addition, due to the design of the turbulent flow synergistic plate and the synergistic dust removal device, the desulfurization efficiency and desulfurization capacity are further improved. The system can meet the emission requirements that the SO2 concentration value at the outlet of the absorption tower is lower than 35mg / Nm < 3 > and the particulate matter concentration value is lower than 5mg / Nm < 3 > under the condition that the SO2 concentration at the inlet of the single-tower absorption tower is less than or equal to 6200mg / Nm < 3 >.

Description

technical field

[0001] The invention relates to the technical field of flue gas desulfurization, in particular to a single-tower desulfurization ultra-clean treatment system and a desulfurization process. Background technique

[0002] At present, the flue gas desulfurization treatment of more than 90% of domestic coal-fired units adopts the limestone / lime-gypsum wet desulfurization process. 2 Has a high removal efficiency. With the improvement of efficiency and the control of enterprise operating costs, the source of coal quality has changed too much. The domestic requirements for flue gas emissions are all controlled by ultra-clean indicators (SO 2 ≤35mg / Nm 3 , Dust≤10mg / Nm 3 ), thus greatly limiting the single-tower treatment efficiency, at the inlet SO 2 The emission concentration exceeds 4000mg / Nm 3 Under certain conditions, most enterprises adopt the process route of double towers and double cycles, but there are disadvantages such as large floor area, large invest...

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