Abstract:

Based on the technical renovation project of boiler make-up water system in a power plant in North China，the design characteristics and operation mode of ultrafiltration-first stage reverse osmosis-second stage reverse osmosis-electrodeionization（EDI） integrated membrane technology were introduced. The typical problems in different commissioning conditions of each main processing unit were analyzed，such as start-stop，normal operation，backwash，chemical cleaning，dosing and maintenance washing. The corresponding solutions and precautions were given from the aspects of pipeline design，control strategy and commissioning parameters. The long-term operation results after commissioning showed that the whole process system operated stably，the water index was qualified，and the conductivity was less than 0.1 μS/cm，silicon mass concentration was less than 10 μg/L，TOC was less than 200 μg/L. The economic benefits analysis showed that the new boiler feedwater system reduced the environmental pressure on the power plant， saved water intake costs，and the operating cost per ton of water was about 4.3 yuan. The operation and maintenance cost was relatively low，which could improve the quality and efficiency of the chemical water production system in the power plant.

Key words: boiler make-up water, integrated membrane technology, commissioning, countermeasures

摘要：

以华北地区某电厂锅炉补给水系统技改项目为背景，介绍了超滤-一级反渗透-二级反渗透-电去离子（EDI）全膜法处理工艺的设计特点和运行方式，剖析了各主要处理单元在启停、正常运行、反洗、化学清洗、加药、维护性冲洗等不同工况调试过程中出现的典型问题，从管路设计、控制策略、调试参数等方面给出相应的解决方案和注意事项。调试后长期运行结果表明，整套工艺系统运行稳定，产水指标合格，产水电导率小于0.1 μS/cm，硅质量浓度小于10 μg/L，TOC小于200 μg/L。对其经济效益进行分析，结果表明，新建锅炉补给水系统减轻了电厂环保压力，节约了取水成本，吨水运行成本约4.3元，运维成本较低，可为电厂化学制水系统提质增效。

关键词: 锅炉补给水, 全膜法, 调试, 对策

CLC Number: 

• TM621.2