Variation of dissolved oxygen in circulating water of SCAL indirect air-cooling system and its indirect effect on pH value

XIAO Haigang; JIA Lan; HUANG Wanqi; TANG Ziqiang; WANG Gang; ZHANG Hongbo; TONG xin

doi:10.19666/j.rlfd.202103077

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Variation of dissolved oxygen in circulating water of SCAL indirect air-cooling system and its indirect effect on pH value

更新时间：2025-09-28

- Variation of dissolved oxygen in circulating water of SCAL indirect air-cooling system and its indirect effect on pH value
- Thermal Power Generation Vol. 50, Issue 11, Pages: 177-182(2021)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 国能宁东第二发电有限公司
  3. 宁夏京能宁东发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202103077
  CLC： TM621
- Published：2021
- 稿件说明：
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XIAO Haigang, JIA Lan, HUANG Wanqi, et al. Variation of dissolved oxygen in circulating water of SCAL indirect air-cooling system and its indirect effect on pH value[J]. Thermal power generation, 2021, 50(11): 177-182.
DOI：

XIAO Haigang, JIA Lan, HUANG Wanqi, et al. Variation of dissolved oxygen in circulating water of SCAL indirect air-cooling system and its indirect effect on pH value[J]. Thermal power generation, 2021, 50(11): 177-182. DOI： 10.19666/j.rlfd.202103077.

摘要

表面式换热器铝制散热器(SCAL)型间接空冷(间冷)机组已经成为解决我国北方富煤贫水地区发电的有效措施

该机组SCAL型间冷系统稳定运行过程中常出现循环水pH值异常升高的现象。由于系统内散热器采用铝材质

pH值异常升高会破坏铝管表面氧化膜

导致散热器腐蚀甚至泄漏

因此循环水p H值异常升高是该系统运行的难题。通过对SCAL型间冷系统结构的分析、水质调研

分析了系统中的动态变量

通过理论计算和工业试验验证对该问题进行了深入研究。结果表明:SCAL型间冷系统在运行期间基本处于密闭状态

外界氧气难以扩散进入

系统循环水中溶解氧的来源为系统运行前除盐水中溶解的氧气;碳钢的腐蚀反应是系统中溶解氧主要的消耗方式;溶氧量变化改变了碳钢腐蚀产物的类型

当系统中溶氧量较低时

碳钢腐蚀生成的Fe(OH)_2具有较大的溶度积

能够导致循环水pH值升高。

Abstract

Surface heat exchanger aluminum radiator(SCAL) indirect air-cooling units has become an effective measure to solve problems during power generation in coal-rich and water-poor areas in northern China. However

the phenomenon that the p H value of circulating water increases unexpectedly occurs frequently during stable operation of the SCAL indirect cooling system. The radiator in this system is made of aluminum. The abnormal increase of pH value may cause corrosion of the oxidation film on the aluminum tube

even leading to leakage.Thus

the abnormal increase of pH value of the circulating water is the primary problem troubling chemical operators. By analyzing the structure of the SCAL indirect air-cooling system and the quality of circulating water

the dynamic variables in the system were analyzed in this paper. An in-depth study of this problem was conducted through theoretical calculation and industrial test verification. The results show that

the SCAL indirect air-cooling system is basically in a closed state during operation

the oxygen is difficult to diffuse into the system from outside.The source of the dissolved oxygen in the circulating water of the system is the dissolved oxygen in the desalting water before the operation. Corrosion reaction of carbon steel is the main reaction consuming the dissolved oxygen in the system. The decrease of dissolved oxygen content changes the phase of corrosion products of carbon steel.When the dissolved oxygen content is low

the Fe(OH)2 formed by carbon steel corrosion has relatively large solubility

which can lead to the increase of pH value of the circulating water.

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