System for treating desulfurization wastewater by coupling low-temperature flue gas with dry slag waste heat and construction method of system

Abstract

The invention discloses a system for treating desulfurization wastewater by coupling low-temperature flue gas with dry slag waste heat and a construction method of the system. The system comprises a concentration and neutralization system for receiving desulfurization wastewater and a drying system connected to the concentration and neutralization system. Two kinds of power station waste heat are adopted, low-temperature flue gas at the temperature of 90-150 DEG C is firstly utilized to achieve concentration and reduction, then dry residue waste heat is utilized to achieve waste water drying and curing, drying and curing of the wastewater are achieved through a two-step method, and energy conservation and consumption reduction are achieved through matching and coupling of the two heat sources; through combined arrangement of a flue, a flue gas inlet pipe and a flue gas outlet pipe, after desulfurization wastewater is dried, crystal water enters flue gas for recycling in a water vapor form; the dried salt-containing powder is mixed with the dry slag, so that comprehensive utilization is realized; and waste heat of a slag well and an air temperature device are combined and utilized, and drying is optimized by cooperating with a dry slag conveyor, so that energy conservation and consumption reduction of the boiler are realized.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a low-temperature flue gas coupling dry slag waste heat treatment desulfurization wastewater system and a construction method thereof. Background technique [0002] As our country strengthens the control of water pollution, especially for power plants, the requirement of zero discharge of wastewater from the whole plant has been put forward. The external wastewater discharge of coal-fired power plants mainly includes circulating sewage, finely treated concentrated brine, and wet desulfurization wastewater. Among them, wet desulfurization wastewater is the worst water quality wastewater, which has high salt content, high chlorine, high hardness, and is affected by coal quality. The characteristics of large impact fluctuations are the key points to realize zero discharge of wastewater in the whole plant. [0003] At present, the desulfurization wastewater...

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Problems solved by technology

[0004] The invention provides a low-temperature flue gas coupled dry slag waste heat treatment desulfurization wastewater system and its construction method, which are used to solve technical problems such as concentration, drying and recycling of desulfurization wastewater at low cost and low energy consumption

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