国内某热电联产机组旁路烟气干燥法脱硫废水零排放系统运行分析

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中图分类号：X703 文献标志码：A 文章编号:1003-5168(2025)24-0079-04

DOI:10.19968/j.cnki.hnkj.1003-5168.2025.24.014

Operational Analysis of a Zero-Liquid-Discharge System for Desulfurization Wastewater Using the Bypass Flue Gas Drying Method in a Domestic Cogeneration Unit

LI Mingzhi ZHANG Xuefu ZHU JunchaoDAI Shangfang (Zhejiang Zheneng Technology& Environment Group Co.,Ltd., Hangzhou , China)

Abstract: [Purposes] To address the compliance requirements for desulfurization wastewater discharge and energy consumption control in a combined heat and power(CHP) unit,resolve the conflict between environmental protection and economic operation in thermal power plants,and validate the applicability, reliability,and engineering implementation value of the bypassflue gas drying method in zero-liquiddischarge wastewater systems. [Methods] Using a domestic CHP unit as a case study,this research explains the technical principles of bypass high-temperature flue gas drying,examines the system components,outlines the startup procedures,and demonstrates load matching and wastewater treatment capacity regulation.[Fingdings] The flue gas temperature at the drying tower inlet ranged from 295 to 320C and at the outlet from 155 to 170‰ ,with no wet wall phenomenon observed. Salts were crystallized and recovered; acidic gases were neutralized using hydrated lime.The ash conveying cycle of the electrostatic precipitator was shortened by 15% to 25% . The system operates with low energy consumption by utilizing flue gas waste heat, ensuring stable operation and extended maintenance intervals.[Conclusions] The bypassflue gas drying method is mature and reliable,achieves zero liquid discharge of desulfurization wastewater,balances environmental protection and economic efciency,meets the wastewater treatment requirements for large-scale CHP units,and possesses value for engineering promotion.

Keywords: desulfurization wastewater; zero liquid discharge; bypassflue; spray drying; centrifugal atomization

0 引言

随着国家对火电厂污水排放标准的收紧及给排水收费机制的完善，火电厂面临环保合规与经济性的双重挑战，脱硫废水高效处理与零排放是核心难题。（剩余5530字）