Abstract

The experience in the operation of atmospheric deaerators demonstrates that decreasing the bicarbonate alkalinity of deaerated water reduces the efficiency of deaerator operation. The available publications on the deaeration do not provide information on the causes of this reduction at a bicarbonate alkalinity of less than 0.2 mg-equiv/dm³. There is a problem of carbonic acid removal from the coolant at thermal power plants where steam condensate is used as feed water. AO Sibtechenergo’s specialists faced this problem during commissioning of atmospheric deaerators operating at a low bicarbonate alkalinity of the deaerated water. During commissioning of the deaerators, the content of carbonic acid in the deaerated water often changed with no apparent causes. On completion of the commissioning, carbonic acid had a lower content in the deaerated water and was even absent under certain operating conditions. An experimental deaerator where distillate with low bicarbonate alkalinity was used as deaerated water was tested. Carbonic acid was not removed from the deaerated water if its content did not exceed 3.0 mg/dm³ and the bicarbonate hardness was below 0.06 mg-equiv/dm³. Adding tap water to the investigated distillate in an amount of 0.22% decreased the content of carbonic acid in the deaerated water. With an increase in the amount of added tap water to 0.44%, carbonic acid was completely removed from the deaerated water. At thermal power plants with a closed steam-water path (circuit), carbonic acid can be removed from the closed circuit by increasing the steam vent from district water heaters and deaerators above the standard value.

中文翻译：

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大气除氧器中碳酸去除的分析

摘要

大气脱气器运行的经验表明，降低脱气水的碳酸氢盐碱度会降低脱气器运行的效率。有关脱气的可用出版物未提供有关碳酸氢盐碱度低于0.2 mg-equiv / dm ^3时该还原反应的原因的信息³。在将蒸汽冷凝物用作给水的热电厂中，存在从冷却剂中去除碳酸的问题。AO Sibtechenergo的专家在调试脱气水的碳酸氢盐碱度较低的大气脱气器时遇到了这个问题。在脱气机调试期间，脱气水中的碳酸含量通常没有明显的变化。调试完成后，碳酸在脱气水中的含量较低，在某些操作条件下甚至不存在。测试了实验性除气器，其中将碳酸氢盐碱度较低的馏出物用作脱气水。如果碳酸含量不超过3.0 mg / dm ^3，则不能从脱气水中去除碳酸碳酸氢盐硬度低于0.06mg-equiv / dm ³。将自来水以0.22％的量添加到研究的馏出物中可降低脱气水中碳酸的含量。随着自来水添加量增加到0.44％，碳酸已从脱气水中完全去除。在蒸汽-水路径（回路）闭合的热电厂中，可以通过将区域热水器和除氧器的蒸汽排放口增加到标准值以上，从闭合回路中除去碳酸。