PDF《一种新的酸露点计算式及其现场实验验证》

第48 卷第4期热力发电Vol.

48 No.4

2019 年4月THERMAL POWER GENERATION Apr.

2019 收稿日期:2018-08-24 基金项目:山西省重点实验室开放基金(SKLCHECUCFB-201701) Supported by:Shanxi Provincial Key Laboratory Open Fund (SKLCHECUCFB-201701) 第一作者简介:李加护(1973―),男,讲师,主要研究方向为能源洁净技术与锅炉低温受热面技术,lijiahu01@163.com. 一种新的酸露点计算式及其现场实验验证 李加护,王小涛,张猛,王太,谢英柏,阎维平 (华北电力大学(保定)研究生院动力工程系,河北 保定 071003) [摘要]烟气酸露点是制约深度余热回收技术的重要因素,准确预测该数值对避免低温腐蚀、降低 排烟热损失及提高锅炉效率有重要意义.在对几种常用酸露点计算式分析比较的基础上, 采用最小二乘法对相关实验数据进行拟合后得到拟合式,通过理论计算及近年来相关学者 现场测量数据对相关公式进行对照分析,并使用自行设计的酸露点测量装置对本文提出的 计算式的计算数值进行了验证. 结果表明, 本文提出的计算式计算数值分布范围更加合理, 当SO3 体积分数低于

20 mL/m3 时具有更高的计算精度. [关键词]酸露点;

计算式;

余热利用;

最小二乘法;

低温腐蚀;

排烟温度;

锅炉效率 [中图分类号]TK222;

O652 [文献标识码]A [DOI 编号]10.19666/j.rlfd.201808188 [引用本文格式]李加护, 王小涛, 张猛, 等. 一种新的酸露点计算式及其现场实验验证[J]. 热力发电, 2019, 48(4): 110-115. LI Jiahu, WANG Xiaotao, ZHANG Meng, et al. A noval acid dew point calculation formula and its field experiment verification[J]. Thermal Power Generation, 2019, 48(4): 110-115. A noval acid dew point calculation formula and its field experiment verification LI Jiahu, WANG Xiaotao, ZHANG Meng, WANG Tai, XIE Yingbai, YAN Weiping (School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, China) Abstract: The acid dew point of flue gas is an important factor that restricts deep waste heat recovery technology. Accurate prediction of this value is of great significance for avoiding low temperature corrosion, reducing heat loss of flue gas and improving boiler efficiency. Based on the analysis and comparison of common calculation formulas of acid dew point, the least square method is used to fit the relevant experimental data to obtain the fitted formula, which is analyzed through theoretical calculation and field measurement data of relevant scholars in recent years. The calculation results of the formula proposed in this paper are verified by using self-designed measurement device of acid dew point. The result shows that the formula proposed in this paper not only has a more reasonable range of numerical prediction, but also has higher accuracy than others when the volume fraction of SO3 is below

20 mL/m3 . Key words: acid dew point, calculation formula, waste heat utilization, least square method, low temperature corrosion, exhaust gas temperature, boiler efficiency 随着社会经济的发展,燃煤电站污染物排放标 准不断提高[1] ,煤电企业运行费用明显增加,利润 大幅下降.因此,对于煤电企业而言,有效降低发 电煤耗、提高燃煤锅炉效率与电厂收益成为其关注 的焦点.电站锅炉作为燃煤电站机组的重要组成部 分,其热能损失巨大,其中排烟热损失约占总损失 的50%~70%,造成排烟热损失的主要原因是较高 的排烟温度.相关学者指出锅炉尾部烟气温度每降 低10~20 ℃,锅炉效率会提升 0.6%~1.0%[2] . 回收锅炉尾部烟气余热,降低锅炉排烟温度是 较为有效的节能手段.鉴于此,众多学者对锅炉尾 部烟气余热深度回收的可行性及具体方案进行了 广泛研究[3] .王志军等[4] 提出了一种适用于回收锅 炉尾部烟气余热的有机朗肯循环系统,并对此进行 了经济性分析. Liu S 等[5] 实验研究了一种采用半导 体材料制成的热电发生器实现锅炉的余热回收,为 锅炉尾部烟气余热回收的可实施性提供了理论支 持. 马有福等[6] 以某超超临界