分析凝结水溶解氧偏高的原因

摘要

在火电厂机组运行正常情况下，凝结水溶解氧量是合格的，但是因为许多原因，导致凝结水溶解氧偏高，使机组不能安全稳定的运行，所以必须对凝结水溶解氧偏高的原因进行分析并且使其溶氧量达到标准值。

本文从凝结水系统入手，通过介绍该系统的组成，得出凝结水在整个系统中的流程。而凝结水在循环使用中，不可避免地含有腐蚀物和杂质，而随着电厂机组容量的增大，对水质要求提高，又必须对凝结水进行精处理。然后通过介绍凝结水精处理系统，分析凝结水受污染的原因以及精处理系统需经过过滤和除盐两部分，去除金属腐蚀产物和悬浮杂质以及溶解盐类,但是凝结水溶解氧量偏高所产生的危害却未能消除。接着介绍凝结水溶解氧量偏高所带来的危害，以及可能引起溶解氧量偏高的原因和解决措施，最后以蒙达发电公司和山西武乡和信发电公司为例，根据这两个电厂溶解氧偏高原因的分析以后，都采取相应的有效措施，来降低溶解氧以达到标准值，使机组可以正常运行，这样既提高了资源的利用率，也减少了生产运行成本。

关键词：凝结水；精处理；溶解氧；

Abstract

Coal-fired power plants operation in normal circumstances，condensate dissolved oxygen is qualified, because of many reasons, resulting in condensate dissolved oxygen is high , so that units can not be a safe and stable operation, it must be reasons for the high condensate analysis of dissolved oxygen and let dissolved oxygen reach standard value.

This paper introduces condensed water from the system ,according to introducing the composition of the system obtained in the condensate flow in the system.The condensation of water recycling, inevitably contain corrosive and impurities, and with the power unit capacity increases, improve water quality requirements, but also must be polishing condensate.Then by introducing the condensate polishing system, the analysis of the causes of contaminated condensate polishing system, and should be filtered and the desalination of two parts, the removal of metal corrosion products and suspended impurities and dissolved salts, but high levels of dissolved oxygen of the harm in the condensate is not removed.Then introduced the high levels of dissolved oxygen in the condensate harm, and may cause high levels of dissolved oxygen causes and solutions,. Finally,Mengda power generation companies and power companies and Xinhe of Shanxi Wuxiang example, according to these two causes of the high dissolved oxygen plant, after they take appropriate and effective measures to reduce the dissolved oxygen to meet the standard value, the unit can be Normal operation, this not only improves the resource utilization, but also reduce the operating costs of production.

Keywords: Condensate; polishing; dissolved oxygen;

目录

引言 (1)

第一章凝结水系统 (2)

1.1凝结水概述 (2)

1.2 凝结水系统组成 (2)

1.2.1凝结水泵及其管道 (3)

1.2.2凝结水精处理系统 (4)

1.2.3轴封加热器及凝结水最小流量再循环 (4)

1.2.4低压加热器 (5)

1.2.5补充水系统 (6)

1.3除氧器介绍 (6)

第二章凝结水精处理概述 (8)

2.1凝结水受污染原因 (8)

2.2凝结水精处理的目的 (9)

2.3凝结水处理的重要性 (10)

2.4凝结水精处理系统 (11)

2.4.1凝结水过滤 (12)

2.4.2凝结水混床除盐 (14)

2.5凝结水处理设备与热力系统的连接方式 (17)

2.5.1低压凝结水精处理系统 (17)

2.5.2中压凝结水精处理系统 (17)

第三章凝结水溶解氧偏高原因的分析 (18)

3.1凝结水溶解氧偏高的原因 (18)

3.2凝结水溶解氧偏高的危害 (20)

3.3凝结水溶解氧偏高的解决措施 (21)

3.4分析凝结水溶解氧偏高原因实例 (23)

3.4.1蒙达公司凝结水溶解氧超标原因分析及改造 (23)

3.4.2 600MW直接空冷机组凝结水溶氧偏高分析及解决措施 (25)

结论 (29)

参考文献 (30)

谢辞 (31)