Low temperature flue gas coupling dry slag waste heat treatment desulfurization wastewater system and its construction method

Abstract

The invention discloses a low-temperature flue gas coupling dry slag waste heat treatment desulfurization wastewater system and a construction method thereof. The system includes a concentration neutralization system for receiving desulfurization wastewater and a drying system connected to the concentration neutralization system; the invention uses two kinds of power station waste heat, First use the low-temperature flue gas at 90-150°C to achieve concentration and weight reduction, and then use the waste heat of dry slag to dry and solidify the wastewater. The two-step method realizes the drying and solidification of wastewater. Through the matching and coupling of the two heat sources, energy saving and consumption reduction are realized; through The flue, the flue gas inlet pipe and the flue gas outlet pipe are jointly installed. After the desulfurization wastewater is dried, the crystal water enters the flue gas in the form of water vapor for reuse; and the dried salt powder is mixed into the dry residue to realize comprehensive utilization; Combining the waste heat of the slag well, the air temperature device and the optimization of drying with the dry slag conveyor, the energy saving 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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