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烟道蝶阀的结构特性

作者: 兴罡石化设备| 时间:2015-09-01 10:42:12 | 点击次数:

 从标准规定(ding)和实际使(shi)用情况分析, 烟道(dao)蝶(die)(die)(die)(die)阀(fa)用于介(jie)质(zhi)的截断或者调节(jie)时, 其密封(feng)(feng)性(xing)能要(yao)求与(yu)(yu)金属(shu)密封(feng)(feng)蝶(die)(die)(die)(die)阀(fa)有一(yi)定(ding)的差别。作为管网(wang)含尘烟气(qi)控制(zhi)设备, 处(chu)(chu)于关(guan)(guan)闭位(wei)置仍留有一(yi)定(ding)间隙(xi)不会影响(xiang)管路开度(du)调节(jie)达(da)到(dao)炉压的自(zi)动控制(zhi)。烟道(dao)蝶(die)(die)(die)(die)阀(fa)与(yu)(yu)金属(shu)密封(feng)(feng)蝶(die)(die)(die)(die)阀(fa)流(liu)(liu)体(ti)特性(xing)相(xiang)似(si), 蝶(die)(die)(die)(die)阀(fa)开度(du)与(yu)(yu)流(liu)(liu)量之间的关(guan)(guan)系基本上呈线性(xing)比例关(guan)(guan)系。如果用以(yi)(yi)控制(zhi)流(liu)(liu)量, 其流(liu)(liu)量特性(xing)与(yu)(yu)配(pei)套管路的流(liu)(liu)阻系数(shu)有密切(qie)关(guan)(guan)系。如两条(tiao)管道(dao)安(an)装阀(fa)门口(kou)径和形式完全(quan)相(xiang)同, 而管道(dao)损失(shi)系数(shu)不同, 阀(fa)门的流(liu)(liu)量差别就(jiu)会相(xiang)差很大(da)。如果阀(fa)门处(chu)(chu)于节(jie)流(liu)(liu)幅(fu)度(du)较(jiao)大(da)的状态(tai), 蝶(die)(die)(die)(die)板处(chu)(chu)于中间开度(du)时, 关(guan)(guan)闭过程中, 蝶(die)(die)(die)(die)板上下(xia)两侧(ce)(ce)(ce)(ce)可以(yi)(yi)形成完全(quan)不同的状态(tai), 一(yi)侧(ce)(ce)(ce)(ce)蝶(die)(die)(die)(die)板前端顺(shun)介(jie)质(zhi)流(liu)(liu)向(xiang)而动, 另一(yi)侧(ce)(ce)(ce)(ce)则(ze)逆介(jie)质(zhi)流(liu)(liu)向(xiang)而动。因此, 一(yi)侧(ce)(ce)(ce)(ce)阀(fa)体(ti)与(yu)(yu)蝶(die)(die)(die)(die)板形成似(si)喷嘴(zui)形开口(kou), 另一(yi)侧(ce)(ce)(ce)(ce)则(ze)类(lei)似(si)节(jie)流(liu)(liu)孔形开口(kou), 喷嘴(zui)侧(ce)(ce)(ce)(ce)比节(jie)流(liu)(liu)侧(ce)(ce)(ce)(ce)流(liu)(liu)速快的多, 而节(jie)流(liu)(liu)侧(ce)(ce)(ce)(ce)一(yi)面往往会产生(sheng)负压, 所以(yi)(yi)烟道(dao)蝶(die)(die)(die)(die)阀(fa)水平安(an)装时应将喷嘴(zui)侧(ce)(ce)(ce)(ce)放在管道(dao)的下(xia)部, 可以(yi)(yi)避免管道(dao)阀(fa)门连接处(chu)(chu)灰堵(du)现象(xiang)的发(fa)生(sheng)。

烟(yan)(yan)(yan)道(dao)(dao)蝶(die)阀(fa)(fa)(fa)(fa)(fa)(fa)主(zhu)要起截流和调(diao)节流量(liang)的作用, 特别(bie)是(shi)大口径(jing)(jing)(jing)蝶(die)阀(fa)(fa)(fa)(fa)(fa)(fa), 工(gong)(gong)况(kuang)条(tiao)件(jian)影响(xiang)(xiang)阀(fa)(fa)(fa)(fa)(fa)(fa)门的变形(xing)因(yin)素较(jiao)多且变形(xing)量(liang)不(bu)(bu)易(yi)控制, 所以(yi)结(jie)(jie)构(gou)设(she)计应(ying)考虑(lv)环(huan)境因(yin)素的影响(xiang)(xiang)。烟(yan)(yan)(yan)道(dao)(dao)蝶(die)阀(fa)(fa)(fa)(fa)(fa)(fa)径(jing)(jing)(jing)向(xiang)密(mi)封(feng)(feng)(feng)与金属密(mi)封(feng)(feng)(feng)蝶(die)阀(fa)(fa)(fa)(fa)(fa)(fa)结(jie)(jie)构(gou)相似, 应(ying)用过程(cheng)中受(shou)温(wen)度影响(xiang)(xiang)易(yi)产生(sheng)热卡阻, 影响(xiang)(xiang)阀(fa)(fa)(fa)(fa)(fa)(fa)门的启闭。烟(yan)(yan)(yan)道(dao)(dao)蝶(die)阀(fa)(fa)(fa)(fa)(fa)(fa)密(mi)封(feng)(feng)(feng)形(xing)式(shi)以(yi)平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)密(mi)封(feng)(feng)(feng)较(jiao)为理(li)想, 可以(yi)设(she)计成垂(chui)直(zhi)板(ban)(ban)(ban)(ban)或斜(xie)板(ban)(ban)(ban)(ban)式(shi)结(jie)(jie)构(gou)(图2) , 阀(fa)(fa)(fa)(fa)(fa)(fa)体(ti)(ti)、蝶(die)板(ban)(ban)(ban)(ban)以(yi)侧平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)为密(mi)封(feng)(feng)(feng)副(fu)。蝶(die)板(ban)(ban)(ban)(ban)外(wai)径(jing)(jing)(jing)可以(yi)小于(yu)(yu)阀(fa)(fa)(fa)(fa)(fa)(fa)体(ti)(ti)通径(jing)(jing)(jing), 即使阀(fa)(fa)(fa)(fa)(fa)(fa)门内腔(qiang)管壁有(you)粘结(jie)(jie)也能(neng)方便开(kai)(kai)启。管道(dao)(dao)变形(xing)对(dui)阀(fa)(fa)(fa)(fa)(fa)(fa)门主(zhu)体(ti)(ti)密(mi)封(feng)(feng)(feng)性能(neng)影响(xiang)(xiang)没有(you)径(jing)(jing)(jing)向(xiang)密(mi)封(feng)(feng)(feng)效果(guo)明显(xian)。该结(jie)(jie)构(gou)阀(fa)(fa)(fa)(fa)(fa)(fa)体(ti)(ti)密(mi)封(feng)(feng)(feng)面(mian)(mian)(mian)(mian)的对(dui)称度要求(qiu)较(jiao)高, 特别(bie)是(shi)斜(xie)板(ban)(ban)(ban)(ban)式(shi)结(jie)(jie)构(gou)其阀(fa)(fa)(fa)(fa)(fa)(fa)体(ti)(ti)密(mi)封(feng)(feng)(feng)侧平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)在(zai)(zai)普通机(ji)械(xie)设(she)备上(shang)难以(yi)加工(gong)(gong), 必须安排合(he)理(li)的工(gong)(gong)艺才能(neng)使装配精度达到(dao)理(li)想的密(mi)封(feng)(feng)(feng)效果(guo)。平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)密(mi)封(feng)(feng)(feng)结(jie)(jie)构(gou)如果(guo)采用杠杆式(shi), 无论垂(chui)直(zhi)板(ban)(ban)(ban)(ban)还(hai)是(shi)斜(xie)板(ban)(ban)(ban)(ban)结(jie)(jie)构(gou)都可解决(jue)密(mi)封(feng)(feng)(feng)平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)在(zai)(zai)加工(gong)(gong)过程(cheng)中存(cun)在(zai)(zai)的问题。该结(jie)(jie)构(gou)有(you)许多优点, 杠杆结(jie)(jie)构(gou)阀(fa)(fa)(fa)(fa)(fa)(fa)门密(mi)封(feng)(feng)(feng)面(mian)(mian)(mian)(mian)为侧平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)密(mi)封(feng)(feng)(feng), 不(bu)(bu)会(hui)产生(sheng)径(jing)(jing)(jing)向(xiang)卡阻。另外(wai), 阀(fa)(fa)(fa)(fa)(fa)(fa)体(ti)(ti)和蝶(die)板(ban)(ban)(ban)(ban)密(mi)封(feng)(feng)(feng)侧平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)为连续的平(ping)(ping)(ping)面(mian)(mian)(mian)(mian)整体(ti)(ti)加工(gong)(gong), 蝶(die)板(ban)(ban)(ban)(ban)外(wai)径(jing)(jing)(jing)设(she)计小于(yu)(yu)阀(fa)(fa)(fa)(fa)(fa)(fa)体(ti)(ti)通径(jing)(jing)(jing)。蝶(die)板(ban)(ban)(ban)(ban)关闭过程(cheng)先转(zhuan)动(dong)后平(ping)(ping)(ping)动(dong)密(mi)封(feng)(feng)(feng)面(mian)(mian)(mian)(mian)越(yue)压越(yue)紧(jin), 开(kai)(kai)启过程(cheng)蝶(die)板(ban)(ban)(ban)(ban)先平(ping)(ping)(ping)动(dong)后转(zhuan)动(dong), 也不(bu)(bu)会(hui)产生(sheng)卡阻。烟(yan)(yan)(yan)道(dao)(dao)蝶(die)阀(fa)(fa)(fa)(fa)(fa)(fa)一般(ban)在(zai)(zai)压力低(di)、温(wen)度高的环(huan)境条(tiao)件(jian)下工(gong)(gong)作, 不(bu)(bu)会(hui)影响(xiang)(xiang)阀(fa)(fa)(fa)(fa)(fa)(fa)门启闭。

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