W火焰锅炉炉内煤粉气流着火特性研究.pdf

研究与探讨
W火焰锅炉炉内煤粉气流着火特性硏究
吴晓阳
(公安海警学院机电系,江宁波315801)
摘要;对一台引进的300MW机组W火焰锅炉炉内牒粉气流的着火特性进行了研究,试了不同二次风挡
板开度及粉溆编器上乏气挡板开度下燃烧器区城烟气温度分布。结果表明二次风搭板和乏气挡板的开度在
不同程度上形响到炉内着火特性;虽然乏气揩板开度能形响煤粉浓、淡两倒的气相分配,但其对渫粉气
流着火的响较二次风挡板开度弱的多,究其原因在于燃烧器噴ロ采周一、二次风ロ相间布エ,二次风高开
喷口后极易与浓煤粉气流泥合,这直接形响到煤粉气流的着火。
关词:W火焰锅炉;着火特性;二次风挡板;乏气挡板
中分类号:TK229.6
文标识码:A
文章编号:1004-3950(2012)01-0016
Experimental investigation on the coal ignition characteristics for
a W-shaped flame boiler
WU Xiao-yang
Mechanical and Electrical Department, China Maritime Police Academy, Ningbo 315801, China)
Abstract: To obtain the igni on chaacter tics of a 30 MW unit Shaped lame boiler, experiments were performed
with measurements taken of gas temperatures in the burner region at different secondary air damper openings on arches
and at different vent air damper openings for c clone concentrators, respectively. Results showed that both the seconda
ry air and vent air damper openings impacted the coa/air mixture ignition in the fumace but with different extent. The
effect of the vent air damper opening was far lower than that of the secondary air damper opening, despite the air distri-
bution between the primary air and vent air changing with the vent air damper opening. This was because that the sec-
ondary air was prematurely mixed with the primary air at the early stage of ignition due to the respective nozzles and
Key words: W-shaped flame boiler; ignition characteristics; secondary air damper; vent air damper
0前言
的下炉膛燃烧器区域四周炉壁上敷设绝热的卫燃
带以维持燃烧器区域高温水平,采用煤粉浓缩器
我国目前的电站锅炉主要燃用无烟煤、贫煤、技术以降低煤粉气流的着火热或采用热风送粉,
劣质烟煤等低反应、劣质煤种。由于挥发分含量以期实现较早着火和较好燃尽,但是从目前国内
校低,无烟煤的着火温度高,着火、稳定燃烧以及外已投运的W火焰锅炉来看,着火晚是锅炉运行
燃尽都比较困难,W型火焰锅炉综合了强化无烟中比较突出的一个问题,实测着火点通常在2m
煤燃烧的各种措施,非常适合于燃烧无烟煤,在西以上,远晚于切圆和墙式燃烧方式下理想的着火
方是燃烧劣质煤的典型锅炉燃烧技术,由于它脱点(约0.5m),从而影响煤粉颗粒的燃尽,造成飞
胎于早期的U型火焰锅炉,故又称为双U型或顶灰可燃物含量偏高S-?。
部燃烧方式锅炉-1。
为指导锅炉实际运行及设计,需要大量的锅
虽然火焰锅炉是专门针对无烟煤着火难、炉热态试验数据。国内对于大型W火焰锅炉的
稳燃难和燃尽难这一特性而设计的炉型,在锅炉炉内燃烧缺乏系统的试验研究,没有指导大型W
收稿日期:2011-09-20
作者简介:吴晓阳(1982-)男,江西余干人,讲师,主要从事船舶糖机的教学及热能动力方面的研究。
16
万方数据