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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (10): 1960-1967    DOI: 10.3785/j.issn.1008-973X.2021.10.018
机械与能源工程     
导热油换热器预热煤粉气流的试验研究
来振亚1(),毛睿2,李源2,张平安2,杜学森2,周昊1,*()
1. 浙江大学 能源清洁利用国家重点实验室，浙江 杭州 310027
2. 润电能源科学技术有限公司，河南 郑州 450052
Experimental study on preheating pulverized coal air flow by heat exchanger using thermal oil
Zhen-ya LAI1(),Rui MAO2,Yuan LI2,Ping-an ZHANG2,Xue-sen DU2,Hao ZHOU1,*()
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
2. Rundian Energy Science and Technology Limited Company, Zhengzhou 450052, China
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摘要：

提出在煤粉进入燃烧室之前对煤粉气流进行预热处理的新型工艺，减轻一次风对炉膛的冷却效应，加速煤粉燃烧. 设计采用导热油预热煤粉气流的带翅板管壳式换热器，搭建中试规模试验台，通过实验研究油温、油质量流量、风温、风速、煤风质量比对系统换热特性及试验台阻力特性的影响. 试验结果验证了该换热器采用导热油来预热一次风煤粉气流的技术可行性，提出的新型预热工艺具有环保节能的现实意义. 试验结果表明，当煤风质量比为0.15时，190 ℃的导热油可以将煤粉气流从58.4 ℃预热到113 ℃以上. 提出的预热工艺有利于改善煤粉气流的着火性能，促进煤粉锅炉的低负荷稳燃.
关键词： 电站锅炉;  煤粉;  预热;  换热器;  着火特性    
Abstract:

A novel technology of pre-heating the pulverized coal air flow before the pulverized coal entering the combustion chamber was proposed to reduce the cooling effect of the primary air on the furnace and accelerate the combustion of the pulverized coal. A shell-and-tube heat exchanger with finned plate that used heat transfer oil to preheat pulverized coal air flow was designed. A pilot scale test bench was constructed to experimentally analyze the effects of oil temperature, oil mass flow, air temperature, air speed, and coal-air mass ratio on the heat transfer characteristics of the system and the resistance characteristics of the test bench. The experimental results verified the technical feasibility of the heat exchanger using heat transfer oil to preheat the primary pulverized coal air flow. The proposed preheating technology had practical significance for environmental protection and energy saving. The experimental results showed that the heat transfer oil at 190 ℃ could preheat the pulverized coal air flow from 58. 4 ℃ to above 113 ℃ when the coal-air mass ratio was 0.15. The proposed preheating process was beneficial to improve the ignition performance of the pulverized coal air flow and promote the low-load stable combustion of the pulverized coal boiler.
Key words: utility boiler    pulverized coal    preheat    heat exchanger    ignition characteristics
收稿日期: 2020-11-18 出版日期: 2021-10-27
CLC:  TK 16  
基金资助: 国家自然科学基金创新研究群体资助项目（51621005）
通讯作者: 周昊     E-mail: lzywyyx2015@163.com;zhouhao@cmee.zju.edu.cn
作者简介: 来振亚（1995—），男，博士生，从事堆积颗粒体系气流阻力及储能特性的研究. orcid.org/0000-0003-3565-9182. E-mail： lzywyyx2015@163.com
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来振亚
毛睿
李源
张平安
杜学森
周昊

引用本文:

来振亚,毛睿,李源,张平安,杜学森,周昊. 导热油换热器预热煤粉气流的试验研究[J]. 浙江大学学报(工学版), 2021, 55(10): 1960-1967.

Zhen-ya LAI,Rui MAO,Yuan LI,Ping-an ZHANG,Xue-sen DU,Hao ZHOU. Experimental study on preheating pulverized coal air flow by heat exchanger using thermal oil. Journal of ZheJiang University (Engineering Science), 2021, 55(10): 1960-1967.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.10.018    或    https://www.zjujournals.com/eng/CN/Y2021/V55/I10/1960

图 1  风粉换热器的设计图
图 2  中试试验系统的示意图
工况 tin，air /℃ vair /(m·s?1) tin，oil /℃ qm /(t·h?1) R
1 60 22.8 190 0.6 0
2 60 22.8 190 1.4 0
3 60 22.8 190 2.2 0
4 60 22.8 165 1.4 0
5 60 22.8 215 1.4 0
6 60 22.8 270 1.4 0
7 40 13.3 190 1.4 0
8 40 18.4 190 1.4 0
9 40 23.9 190 1.4 0
10 40 22.0 190 1.4 0
11 60 22.0 190 1.4 0
12 80 22.0 190 1.4 0
13 60 22.5 190 1.4 0
14 60 22.5 190 1.4 0.15
15 60 22.5 190 1.4 0.25
表 1  煤粉气流预热的实验工况
材料 tin /℃ ρ /(kg·m?3) cp /(J·kg?1·K?1) λ/(W·m?1·K?1)
导热油 165 769 2505 0.1107
导热油 190 751 2590 0.1078
导热油 215 735 2690 0.1049
导热油 270 691 2860 0.0985
煤粉 60 1400 1130 0.0650
20号钢 — 7850 465 48
表 2  材料的物理特性
图 3  风粉换热器的内部结构及热电偶编号
图 4  换热器的传热均匀性
图 5  进口油温对空气温度轴向分布的影响
图 6  进口油温对换热器传热特性的影响
图 7  油质量流量对空气温度轴向分布的影响
图 8  油质量流量对换热器传热特性的影响
图 9  进口风温对空气温度轴向分布的影响
图 10  进口风温对换热器传热特性的影响
图 11  进口风速对空气温度轴向分布的影响
图 12  进口风速对换热器传热特性的影响
图 13  煤风质量比对空气温度轴向分布的影响
图 14  煤风质量比对换热器传热特性的影响
图 15  换热器的阻力特性
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