Precipitation process in citric acid chemical cleaning and its control

ZHANG Xiangjin; DENG Yuqiang; LIU feng

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Precipitation process in citric acid chemical cleaning and its control

更新时间：2025-09-28

- Precipitation process in citric acid chemical cleaning and its control
- Thermal Power Generation Vol. 44, Issue 1, Pages: 96-99(2015)
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TQ031
- Published：2015
- 稿件说明：
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ZHANG Xiangjin, DENG Yuqiang, LIU feng. Precipitation process in citric acid chemical cleaning and its control[J]. Thermal power generation, 2015, 44(1): 96-99.
DOI：

ZHANG Xiangjin, DENG Yuqiang, LIU feng. Precipitation process in citric acid chemical cleaning and its control[J]. Thermal power generation, 2015, 44(1): 96-99. DOI：

摘要

针对采用柠檬酸进行热力设备化学清洗时易产生沉淀的问题

通过试验模拟实际清洗条件

研究了沉淀的类型、产生的条件、沉淀产生的机理

并提出了控制措施。研究表明:柠檬酸清洗产生沉淀是因为清洗液中高浓度的Fe2+与未电离的柠檬酸结合形成柠檬酸亚铁

超过了其溶度积常数而产生沉淀。在一定的清洗条件下(初始柠檬酸浓度、pH值、温度)

影响沉淀的主要因素为Fe2+浓度

因此

建议:在采用柠檬酸化学清洗前

根据实际清洗系统条件

通过试验确定极限Fe2+浓度;也可加入专用防沉淀剂抑制沉淀的产生。

Abstract

The citric acid is easy to cause precipitation during chemical cleaning for thermal power equipments.Thus

a series of experiments simulating the practical chemical cleaning conditions were conducted to figue out the mechanism of precipitation

including the classification of precipitates and the factors affecting the precipitation.Based on the achieved mechanism

the controlling measures were proposed.The results show that

for the high concentration of Fe2+reacting with the unionized citric acid available in solution

ferrous citrate

who has a low solubility

is formed

resulted in precipitation.Under the confirmed cleaning conditions(initial citric acid concentration

temperature)

Fe2+concentration is the dominating factor affecting the precipitation.It is suggested that specific erperiments should be performed to define Fe2+concentration in citric acid cleaning liquid prior to chemical cleaning.A specified anti-sedimentation agent can also be utilized to prevent precipitation.

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