Mechanical Draft Blowers-www.09955.com

Business Mechanical draft refers to the use of fans or blowers to create airflow through the combustion area. When mechanical draft is incorporated, the chimney or stack is used primarily to direct the exhaust gases up and away where they will not be a nuisance. Because wind velocity and direction are less important, the combustion process can be much more carefully controlled. Mechanical draft is accomplished in one of two ways: when air is blown or forced into the combustion chamber it is known as forced draft, when the air is drawn through the combustion chamber it is called induced draft. When both forced and induced draft are used, the system is termed a balanced-draft system. The burning of gas, oil, coal, or other combustible material requires air. When the end result of the burning is to be an efficient combustion process, in compliance with Federal and State Clean Air Act requirements, the volume of supply air must be reliably controlled. Insufficient air volume will result in wasted fuel and excessive particulate along with potentially explosive gases in the exhaust system. Too much air increases the amount of heat carried up the stack by the excess draft. Either extreme increases the cost and difficulty of controlling exhaust emissions. Air can be supplied to the combustion process by natural or mechanical draft. Natural draft simply refers to the use of a chimney or stack to induce an upward flow of air. The stack effect pulls air into the combustion chamber, as shown in Figure 1. The amount of airflow depends on the stacks height and diameter, the prevailing wind velocity, and the resistance of the burner mechanism or fuel bed itself. The demand for air-cleaning apparatus on combustion systems, particularly oil and coal, has increased the overall system resistance to such an extent that natural draft alone is seldom sufficient. Generally, the fans or blowers used for induced-draft applications are larger and more expensive than those used for similar forced-draft applications. The combustion process itself creates gases and elevated temperatures that expand the exhaust airstream, requiring fans with greater volumetric capacity than would be required on the supply side of the combustion process to supply clean, ambient air. Also, the hot exhaust serves to lower the density of the airstream, so density corrections must be applied to the fan static pressure (SP) to overcome the actual system resistance. The fact that the exhaust or flue gases are hot often requires induced-draft fans to be of a construction suitable for higher temperatures. The first induced-draft fans were applied to hand-fired, solid-fuel boilers where the combustion chamber had to be at a negative pressure to permit the operator to shovel in fuel. When oil and gas became primary fuel sources, boiler designers were able to seal the combustion chambers. As a result, forced draft fans became popular. The advantages were lower fan power and fans handling clean air (no corrosion or abrasion) at ambient conditions. These factors encouraged the use of airfoil fans, further reducing power consumption. This led to the almost universal use of pressurized firing in gas, oil, and pulverized coal boilers. Forced draft fans and blowers are common for cast iron firetube and small water tube boilers. The fan or blower serves to provide the air and the velocity necessary for the fuel-to-air mixture to enter the actual combustion chamber. When used in conjunction with induced draft, the forced-draft fan is often called the primary air fan since it provides the primary combustion supply air. The induced-draft fan provides the airflow necessary to overcome system resistance and exhaust the flue gases. Some combustion systems draw hot, perhaps dirty air from other processes. Forced draft fans for such systems are called gas recircula tion fans, and must be selected for the rigorous conditions under which they will operate. Radial-blade fans were at one time commonly used for induceddraft service. However, as pollution requirements have become more stringent and control devices have been added to reduce flue gas particulates (ahead of the induced draft fan), radial-tip blade or even backwardly-inclined fans have become popular due to their higher efficiencies and higher volumetric characteristics. The exception to this is where high efficiency scrubbers are used and the pressure requirements are increased to where the radial-bladed fans are more suited. For additional information please refer to .www.buffaloblower.com/news/index.html. Oleg Tchetchel Fan and Blower Design Engineer Buffalo Blower Co. [email protected] .www.buffaloblower.com/oem/index.html ..buffaloblower../ahu/index.html About the Author: 相关的主题文章:

Both comments and pings are currently closed.

Comments are closed.

haole10.com,midd-885,www.9999mp.com,www.ggg258.com,www.yyy13.com,haha视频 www.1hhh.com,www.tubecao.com,www.sdcp.cn,haha视频,火牛视频 k17.cc,友链交换,haha视频,火牛视频 火牛视频,haha视频,www.nmec.org.cn 519697,友链交换,火牛视频,haha视频 www.yiyi.cc,www.cqpx.cc,www.cnool.net,www.xici.net,www.yofoto.cn,haha视频 zghd,ppp13.com,www.ddd13.com,www.cm68.com,ca1290,周同宇,haha视频,火牛视频 www.jhyc.cn,www.kisstudou.com,友链交换,haha视频,火牛视频 kkxxse.com,www.jhyc.cn,ekdv-273,sayu-02,haha视频,火牛视频 pppd-175,www.zhibo8.cc,haha视频 haha视频 www.40sqw.com,haha视频 haha视频,火牛视频 www.h4610.com,巴特尔道尔吉,石悦军,许皓博,友情链接交换,haha视频,火牛视频 www.xinkebiao.com.cn,www.souhu.com,佃庄吧,宋世长,imjpmig,万万没想到之鹿晗篇,三胞胎替母寻夫,友链交换,haha视频,火牛视频 xingbayounichunnuanhuakai,haha视频,友链交换 www.ddd13.com,www.cm68.com,www.kfc.com.cn,3u8813,ca1834,9c8947,haha视频,火牛视频 4987tv影视,友情链接是什么意思,友情链接的作用 haha视频,kkxxse.com,www.tubecao.com 友链交换,火牛视频,haha视频 翁其钊,haha视频,火牛视频 minmi,yezimei,火牛视频,haha视频 火牛视频,haha视频,友链交换 mcncc,www.33bbb.com,haha视频 www.yofoto.cn,www.cqpx.cc,haha视频,火牛视频 yn111,k8k8.com,whereisip,www.gdosta.org.cn,haha视频,火牛视频 innawoods,ajviewer,haha视频 tom365.com,9c8947,haha视频,火牛视频 haha视频,tom365.com,友链交换 yyets.com,haha视频 9c8996,66bobo,友链交换,haha视频 火牛视频,haha视频,友链交换 www.gpsoo.net,www.faxuan.net,www.zjzs.com,www.cmechina.net,三色网 333se.cc,驯龙高手dm456,友情链接交换,火牛视频,haha视频 www.yyy13.com,www.yinwowo.com,火牛视频,haha视频 www.seseou.com,haole010.com,友情链接买卖,haha视频 yazhoutuse,www.yofoto.cn,www.jhyc.cn,baxia,www.eee50.com,qqzb.cc,www.yngbzx.cn,haha视频 www.555kfc.com,www.xs99.com,友链交换,haha视频,火牛视频 www.semm.com,imjpmig,lata-01,kd.wuhan.net.cn,www.q1se.com,友链交换,火牛视频,haha视频 www.cpew.cn,www.daum.net,lata-01,www.yngbzx.cn,www.q1se.com,www.daum.net,1256789,haha视频,火牛视频 haha视频,www.yngbzx.cn,www.cpew.cn,友情链接 英文 dachiyouxiang,www.9999mp.com,www.9999mp.com,sophia cahill,www.74eee.com,ca1835,66814.com,友链交换,haha视频,火牛视频 www.qqq258.com,www.74eee.com,www.xunbo.cc,友链交换,haha视频,火牛视频 www.tubecao.com,dxperience,www.dde8.com,haha视频 www.cpew.cn,www.q1se.com,lata-01,www.cpew.cn,www.q1se.com,www.cpew.cn,友链交换,火牛视频,haha视频 haha视频,www.yngbzx.cn,jkforum,havd707 qqzb.cc,www.cnool.net,www.cqpx.cc,火牛视频,haha视频 haha视频,长春建筑学院教务系统,444ppp,林球立 dachiyouxiang,www.40sqw.com,www.1hhh.com,qqzb.cc,sophia cahill,www.s9797s.com,haha视频,火牛视频 kamikaze love,visualboyadvance, xxjjyy.com,yuanjiao,www.daum.net,haha视频 www.9999mp.com,www.cpew.cn,www.456ai.com,www.kisstudou.com,友链交换,火牛视频,haha视频 ppp13.com,haha视频,火牛视频 ca1835,3u8895,ca1290,ca4111,www.678mmm.com,masa-c,11aabb.com,友链交换,haha视频,火牛视频 ca1835,haha视频,火牛视频 白城师范学院贴吧,江泽名,百世元婴,haha视频 www.gdosta.org.cn,haha视频,火牛视频 haha视频,火牛视频 www.97se.com,haha视频 友链交换,haha视频 www.75zzz.com,www.52cp.cn,9c8950,友链交换,haha视频 www.84qqq.com,www.h4610.com,www.dy2018.net,jkforum,84qqq.com,haha视频,火牛视频 kkxxse.com,haha视频 www.kkxxse.com,ca1816,www.aaa54.com,truffe,www.k17.cc,友链交换 大连枫叶职业技术学院,友情链接的作用 www.ddd13.com,www.44fang.com,www.51zxw.net,mkdv-02 www.1k100.com,www.htsc.com.cn,www.789mmm.com,www.picchealth.com,www.dytt8.net,www.88xoxo.com,友链交换 www.44fang.com,翁其钊,haha视频 www.daum.net,道姑妙妙,haha视频 19ise.com,haha视频 www.cqpx.cc,www.yofoto.cn,haha视频 3u8547,友情链接的作用,haha视频 www.cmechina.net,3u8813,roxane hayward,友链交换,haha视频,火牛视频 www.bxwx.org,www.44fang.com,www.k8k8.com,江苏大学信息门户,友链交换,haha视频 viper12a,unfccc,66814,haha视频 www.88xoxo.com,www.k8k8.com,haha视频 www.souhu.com,www.tubecao.com,roxane hayward,友链交换,haha视频 www.bv2008.cn,友情链接的作用,haha视频,火牛视频 haha视频,火牛视频 9c8836,火牛视频,haha视频 www.b aidu.com,www.yantasy.com,mycoolboy,友链交换,haha视频,火牛视频 h-a-o 薅羊毛的薅,haha视频 www.84qqq.com,友链交换,haha视频 www.40sqw.com,haha视频,火牛视频跑路了吗 www.jhyc.cn,www.444kk.com,www.zhaokao.net,www.zhaokao.com,友链交换 www.yofoto.cn,haha视频 chunnuanhuakaixingbayouni,友链交换,haha视频 pppd-175,友情链接交换,haha视频 www.gpsoo.net,www.haole55.com,haha视频,火牛视频 www.gpsoo.net,www.haole55.com,haha视频,火牛视频 haha视频,火牛视频,火牛视频跑路了吗 武汉音乐学院官网,haha视频,火牛视频跑路了吗 www.jhyc.cn,陈玖福,haha视频 www.19ttt.com,友链交换,火牛视频绑定支付宝安全吗 www.789mmm.com,www.jhyc.cn,火牛视频刷邀请软件,求教程 www.44fang.com,iptd-651,北京科技大学天津学院,火牛视频代刷 www.yofoto.cn,haha视频,火牛视频是不是骗局 xf.faxuan.net,haha视频,火牛视频怎么刷邀请 www.k17.cc,www.1hhh.com,candle june,mine_清翼,友链交换,火牛视频代刷软件 www.44fang.com,www.xunbo.cc,www.75zzz.com,www.dde8.com,友链交换,haha视频 haha视频,火牛视频,火牛视频跑路了吗 www.dde8.com,www.11aabb.com,www.b aidu.com,www.h4610.com,www.49vv.com,www.8008205555,yezimei,www.k8k8.com,www.sac.net.cn,www.kkxxse.com,www.ddd13.com,www.cm68.com,www.yinwowo.com,49vv.com,www.haole15.com,www com,haha视频 www.777vk.com,友情链接 英文,火牛视频吧913 9c8996,友链交换,haha视频 www.xici.net,haha视频,火牛视频 www.haole04.com,www.04jjj.com,haha视频 友链交换,haha视频,火牛视频 k17.cc,www.1hhh.com,火牛视频,haha视频 www.k8k8.com,www.84qqq.com,友链交换,haha视频 浙江万里学院moodle,haha视频,火牛视频 9c8814,www49vv.com,guitarpro5,3edyy,4444.kk.com,9c8996,daum.net,haha视频,火牛视频 阿尔卑斯牧场物语,haha视频,火牛视频跑路了吗 www.b aidu.com,k8k8.com,aidu.com,9c8921,友链交换,haha视频,火牛视频 友情链接买卖,haha视频,火牛视频跑路了吗 www.b aidu.com,aidu.com,9c8921,demonophobia,道姑妙妙,haha视频,火牛视频 www.huangse.com,haha视频,火牛视频跑路了吗 www.40sqw.com,kd.wuhan.net.cn,yezimei,www.haole15.com,masa-c,友链交换,haha视频,火牛视频 浙江金融职业学院,haha视频,火牛视频 www.xinkebiao.com.cn,yezimei,274300,友链交换,haha视频 zhuxianduowan,k8k8.com,9c8950,haha视频,火牛视频 www.cmechina.net,火牛视频,haha视频 kd.wuhan.net.cn,xxjjyy.com,coscoqd,www.yofoto.cn,xxjjyy.com,友链交换 22eee.net,www.1234567.com,pppd-175,haha视频 www.ppp444.com,dachiyouxiang,秋道取风,haha视频 pgd-426,友链交换,haha视频 www.yyy13.com,火牛视频,haha视频 东北大学就业信息网,haha视频,火牛视频 kd.wuhan.net.cn,www.jhyc.cn,dingxiangwuyuetian,友链交换,haha视频 火牛视频跑路了吗,haha视频 火牛视频,haha视频,火牛视频跑路了吗 haha视频,友链交换,火牛视频跑路了吗 www.09955.com,ca1477,kkxxse.com,haha视频,火牛视频 www.haole04.com,mide031,www.04jjj.com,innawoods,haha视频,火牛视频 www.qqq258.com,qqq258,ca1477,www.09955.com,oboni,友链交换,haha视频,火牛视频 qqq258.com,闲坐仙园,友链交换,火牛视频能提现吗 www.8008205555,qqq258.com,www.jhyc.cn,火牛视频怎么样赚钱 www.s9797s.com,www.xs99.com,haha视频,火牛视频贴吧 www.9999mp.com,友链交换,haha视频,火牛视频能赚钱吗 www.44fang.com,www.zhaokao.com,火牛视频跑路,火牛视频跑路了,火牛视频跑路了吗 www.33bbb.com,www.8008205555,100bbb.com,友链交换,haha视频,火牛视频 火牛视频怎么解除绑定,火牛视频吧913 www.tubecao.com,www.cmechina.net,www.dde8.com,www.k17.cc,haha视频,火牛视频,火牛视频微信激活码,火牛视频客服电话多少 www.haole010.com,www.seseou.com,www.8008205555,www.haole17.com,www.haole12.com,友链交换,火牛视频手机验证出错,火牛视频官网是真的吗 sayu-02,艺校的秘密,火牛视频苹果用不了,火牛视频解冻结 manbetx.cc,googims,友情链接交换,火牛视频,haha视频,火牛视频出多久了? www.cpew.cn,www.jhyc.cn,www.kkxxse.com,www.tubecao.com,www.bv2008.cn,www.sdcp.cn,火牛视频怎么样会火吗,友情链接 英文 coscoqd,9c8950,9c8947,manbetx.cc,友链交换,火牛视频客服电话多少,火牛视频什么时候提现 www.dytt8.net,hotavxxx.com,火牛视频官方邀请码,火牛视频客服群 shishangqiyi,haha视频,火牛视频为什么提现失败,火牛视频微信群激活码 www.yinwowo.com,haha视频,火牛视频客服怎么联系,火牛视频为什么提现不了,火牛火牛视频邀请码彬哥给你视频邀请码 东英吉利大学,火牛视频邀请码彬哥送你,火牛视频怎么提现失败,火牛视频官方客服