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差压变送器在运用中的故障诊断与分析

文章出处:华仁仪表 发表时间:2019-04-06 11:09

 

 

差压变送器在运用中的故障诊断与分析

1、DAOYU

在工业主动化出产中,差压变送器用于压力压差流量的丈量,获得了很是广泛运用,在主动控制系统中阐扬首要的效果。跟着石化、钢铁、造纸、食物、医药企业主动化水平的不竭行进,差压变送器的运用方案越来越广泛,出产中遇到的疑问也不断增加,加上设备、运用、维护人员的水平差异,使得泛起的疑问不能活络处理,一定水平上影响了出产的正常进行,乃至危及出产安全,是以对现场表面维护人员的技能水平提出了更高央求。(延伸阅读...压力变送器)

澳门足彩 2、GONGZUOYUANLIYUQUEDIANQUEZHEN

2.1CHAYABIANSONGQIGONGZUOYUANLI

LAIZILIANGTOUDAOYAGUANDECHAYAZHIJIEXIAOGUOYUCHAYABIANSONGQICHUANGANQILIANGTOUZUGEMOPIANSHANG,JINGYOUJINCHENGMOPIANNEIDEMIFENGYECHUANDAOZHIZHANGLIANGYUANJIANSHANG,ZHANGLIANGYUANJIANJIANGCEDEDECHAYAQIHAOANHAOZHUANHUANWEIYUZHIDUIYINGDEDIANQIHAOANHAOCHUANDIJIZHUANHUANQI,JINGGUOFANGNIANYEDENGCHUZHIBIANWEIGUIFANDIANQIHAOANHAOSHUCHU。CHAYABIANSONGQIDEJIZHONGYUNYONGZHANGLIANGBANFA:(YANSHENYUEDU...WENDUBIANSONGQI)

(1)与节省元件相连系,欺诈节省元件的前后发生的差压值丈量液体流量,如图1所示。
(2)欺诈液体本身重力发生的压力差,丈量液体的高度,如图2所示。
(3)直接丈量不合管道、罐体液体的压力差值,如图3所示。


澳门足彩 图1流体流量丈量图2液位高度丈量图3管路间差压丈量

澳门足彩 CHAYABIANSONGQIDESHEBEIBAOKUODAOYAGUANDEFUSHE、DIANQIQIHAOANHAODIANLANDEFUSHE、CHAYABIANSONGQIDESHEBEI。(YANSHENYUEDU...YALIBIANSONGQI)

2.2CHAYABIANSONGQIQUEDIANQUEZHEN

CHAYABIANSONGQIZAIZHANGLIANGJINCHENGZHONG,CHANGCHANGHUIFANQIYIXIEQUEDIAN,QUEDIANDESHISHIPANDINGFENXIHECHUZHI,DUIZHENGZAIJINXINGLECHUCHANLAISHUOSHIQIADANGSHOUYAODE。WOMENPINGZHENGWANGCHANGWEIHUZHONGDEYUELI,ZONGJIEHUINALEYIXIEPANDINGFENXIBANFAHEFENXILIUCHENG。(YANSHENYUEDU...DUOCANLIANGBIANSONGQI)

(1)查询拜访法:回想缺点发生前的打火、冒烟、异味、供电改动、雷击、湿润、误操作、误修补。
(2)直观法:查询回路的外部损害、导压管的泄露,回路的过热,供电开关情况等。(延伸阅读...压力变送器)

(3)CHAGUANNIAN:

澳门足彩 DUANLUJIANCHA:JIANGSIYIYOUQUEDIANDEYOUXIEYUQITAYOUXIEFENGELAI,JIANCHAQUEDIANSHIBUSHIBUJIAN,JIARUBUJIAN,ZEYIDINGQUEDIANDIZHI,BURANKEJINXINGXIAYIBUCHAZHAO,RU:ZHINENGCHAYABIANSONGQIBUNENGZHENGCHANGHartYUANCHENGTONGXUN,KEJIANGDIANYUANCONGBIAOMIANBENTISHANGDUANKAI,YONGXIANCHANGLINGJIADIANYUANDEBANFAWEICHAYABIANSONGQITONGDIANJINXINGTONGXUN,YIJIANCHASHIBUSHIDIANLANSHIBUSHIDIEJIAYUE2kHzDEDIANCIQIHAOANHAOERGANRAOTONGXUN。(YANSHENYUEDU...DUOCANLIANGBIANSONGQI)

短路检查:在确保安全的情况下,将相关有些回路直接短接,如:差压变送器输出值偏小,可将导压管断开,从一次取压阀外直接将差压变送器两头,查询差压变送器输出,以差异导压管路的堵、漏的连通性。
更换检查:将思疑有缺点的有些更换,差异缺点部位。如:思疑差压变送器电路板发生缺点,可权且更换一块,以一定要素。
分部检查:将丈量回路朋分红几个有些,如:供电电源、旗号暗号输出、旗号暗号变送、旗号暗号检查,按分有些检查,由简至繁,由外至内,减小方案,找出缺点方位。(延伸阅读...压力变送器)

3、DIANXINGQUEDIANSHILI

3.1DAOYAGUANZUSAI

澳门足彩 YIZHENGDAOYAGUANZUSAIWEILILAIFENXIDAOYAGUANZUSAIFANQIDEQUEDIANXIANXIANG。ZAIBIAOMIANWEIHUZHONG,YOUYUCHAYABIANSONGQIDAOYAGUANPAIFANGBUSHISHI,HUOJIEZHIZANG、ZHANDENGYAOSU,JIANLVEFASHENGZHENGFUDAOYAGUANZUSAIXIANXIANG,QISHANXIANTEZHENGWEI:CHAYABIANSONGQISHUCHUXIAJIANG、SHANGSHENGHUOBUBIAN。DANGLIULIANGZENGJIASHI,DUICHAYABIANSONGQI(CHAYABIANSONGQIZIJIJINXINGSHUCHUKAIFANG)SHUCHUDEYINGXIANG:(YANSHENYUEDU...YALIBIANSONGQI)

澳门足彩 SHEYUANLIULIANGWEIF1,P1=P1 -P1-,F’1=K,F’1WEIGAIDONGQIANDECHAYABIANSONGQISHUCHUZHI,

澳门足彩 SHEZENGJIAHOUDELIULIANGWEIF2,(JI:F2>F1),P2=P2 -P2-,F’2=K,F’2WEILIULIANGZENGJIAHOUDECHAYABIANSONGQISHUCHUZHI。

澳门足彩 YOUYUZHENGYAGUANZUSAI,ZEDANGSHIXILIULIANGHUAFENWEIF1、F2SHI,P1=P2 ;

澳门足彩 DANGLIULIANGZENGJIASHI,P2-FANQIYIXIAGAIDONG:YOUYUSHIXILIULIANGZENGJIAWEIF2,ZEYUYUANLIULIANGF1SHIDUIBI,GUANDAONEIDEJINGYALIYEZHAOLIAOZENGJIA,SHEZENGJIAZHIWEIP0,YITONGP2-YINGUANDAOZHONGLIUTILIUSUDEZENGJIAERFASHENGDEJINGYAJIANXIAO,JIANXIAOZHIWEIP0?,CISHIP2-YUP1-DEGUANXIWEI:

澳门足彩 P2-=P1- P0-P0?

澳门足彩 ZE:P2=P2 -P2-=P1 -(P1- P0-P0?)=P1 (P0?-P0)

ZE:F’XIAN=K=K

ZHEIME:

当P0=P0?时则:F’2=K=KF’2=F’1差压变送器输出不变。
澳门足彩 当P0>P0?时则:F’2=K=K,F’2<f’1,差压变送器输出变年夜。当P0<p0?时则:f’2=k=k,f’2>F’1,差压变送器输出变小。差压变送器输出变年夜。

澳门足彩 CHAYABIANSONGQI/DUOCANLIANGBIANSONGQI/DUOCANSHUBIANSONGQI/DUOCANSHULIULIANGBIANSONGQI/DUOBIANLIANGBIANSONGQI/CHAYALIULIANGBIANSONGQI/YALIBIANSONGQI

当流量减小时,对差压变送器输出的影响。

SHEYUANLIULIANGWEIF1,P1=P1 -P1-,F’1=K,F’1WEIGAIDONGQIANDECHAYABIANSONGQISHUCHUZHI。

设减小后的流量为F2,(即:F2>F1),P2=P2 -P2-,F’2=K,F’2为流量减小后的差压变送器输出值。
由于正压管阻塞,则当实习流量划分为F1、F1时,P1=P2 ;

DANGSHIXILIULIANGYOUF1JIANXIAODAOF2SHI,GUANDAOZHONGDEJINGYAYEZHAOLIAODEXIAJIANG,SHEXIAJIANGZHIWEIP0;YITONG,DANGSHIXILIULIANGXIAJIANGZHIF2SHI,P2-ZHIYEYAOYOUYUGUANNEILIUTILIUSUDEXIAJIANGERZENGJIA,SHEZENGJIAZHIWEIP0’。

澳门足彩 CISHI,P2-YUP1-DEGUANXIWEI:-

P2-=P1--P0 P0’
P2=P2 -P2-=P1 -(P1--P0 P0’)=P1 (P0-P0’)
F’2=K=K

ZHEIME:

当P0=P0?时则:F’2=K=KF’2=F’2差压变送器输出不变;
当P0>P0?时则:F’2=K=K,F’2>F’1,差压变送器输出变年夜;
澳门足彩 当P0<p0?时则:f’2=k=k,f’2<f’1,差压变送器输出变小。一般情况下,导压管的堵要素首要是由于丈量导压管不定期排污或丈量介质粘稠、带颗粒物等要素构成。(延伸阅读...温度变送器)差压变送器输出变小。

CHAYABIANSONGQI/DUOCANLIANGBIANSONGQI/DUOCANSHUBIANSONGQI/DUOCANSHULIULIANGBIANSONGQI/DUOBIANLIANGBIANSONGQI/CHAYALIULIANGBIANSONGQI/YALIBIANSONGQI

3.2导压管泄露

以正导压管泄露来分析导压管泄露泛起的缺点现象。如图1所示,莱钢集体公司某加热炉表面控制阀用净化风总管线的流量丈量办法为:节省孔板 差压变送器。设备出产正常时的用风流量基本是安稳的,但在后期的出产进程中发现用风流量比正常值下降了很多。(延伸阅读...压力变送器)


经过检查,二次表面(DCS)组态及电旗号暗号回路工作正常,差压变送器送检定室标定正常,因此思疑疑问泛起出导压上,经过检查,由于正导压管焊接欠好构成泄露所至,经过补焊堵漏后,流量丈量恢复正常。(延伸阅读...压力变送器)


澳门足彩 下面我们分析正导压管泄露时反映出的缺点现象。

澳门足彩 ZHENGDAOYAGUANXIELUDEXIANXIANGSHI:CHAYABIANSONGQISHUCHUXIAJIANG、SHANGSHENGJIBUBIAN

FENXI:

DANGLIULIANGSHANGSHENGSHI,DUICHAYABIANSONGQISHUCHUDEYINGXIANG

SHEYUANLIULIANGWEIF1,P1=P1 -P1-,F’1=K,F’1WEIGAIDONGQIANDECHAYABIANSONGQISHUCHUZHI,

SHEZENGJIAHOUDESHIXILIULIANGWEIF2,(JI:F2>F1),F’2=K,F’2WEILIULIANGZENGJIAHOUDECHAYABIANSONGQISHUCHUZHI。

YINLIULIANGZENGJIA,GUANDAOJINGYAZENGJIAWEIP0,GENZHELIUSUDEZENGNIANYE,SHIXIYAGUANJINGYAJIANXIAOWEIP0?,ZHENGYAGUANXIELUJIANGYAXIAJIANGWEIPs

则:P2=P1 P0-Ps,P2-=P1- P0-P0?
P2=P2 -P2-=P1 (P0?-Ps)

NEIMO

当:P0?=Ps正压导管泄露,而流量上升时,差压变送器输出不变
当:P0?>Ps正压导管泄露,而流量上升时,差压变送器输出增加
澳门足彩 当:P0?<ps正压导管泄露,而流量上升时,差压变送器输出减小< p="">差压变送器输出减小<>

CHAYABIANSONGQI/DUOCANLIANGBIANSONGQI/DUOCANSHUBIANSONGQI/DUOCANSHULIULIANGBIANSONGQI/DUOBIANLIANGBIANSONGQI/CHAYALIULIANGBIANSONGQI/YALIBIANSONGQI

当流量下降时,对差压变送器输出的影响

澳门足彩 SHEXIAJIANGHOUDESHIXILIULIANGWEIF2,JI:F2<f1,f’2=k,f’2WEILIULIANGJIANXIAOHOUDECHAYABIANSONGQISHUCHUZHI。< p="">CHAYABIANSONGQISHUCHUZHI。<>

澳门足彩 CHAYABIANSONGQI/DUOCANLIANGBIANSONGQI/DUOCANSHUBIANSONGQI/DUOCANSHULIULIANGBIANSONGQI/DUOBIANLIANGBIANSONGQI/CHAYALIULIANGBIANSONGQI/YALIBIANSONGQI

因流量下降,管道静压下降值P0,一同由于流体流速下降,负压管静压增加P0?,正压管泄露降压下降为Ps

则:P2=P1 -P0-Ps,P2-=P1--P0 P0?
P2=P2 -P2-=P1-(Ps P0’)
F’2=K=K

即:当流量下降时,差压变送器输出老是小于实习流量。

SHIXISHANG,DANGXIELULIANGHENSHIXIAODESHICHEN,YOUYUGEZHONGYAOSU,JINENGCAOZUOHUOBIAOMIANXIUBUHURENYUANHENNANFAXIAN,ZHIYOUDANGXIELULIANGNIANYE,SUOCELIULIANGYUSHIXILIULIANGDUIBIYOUJIAONIANYEGUOSHISHICAIHUIFAXIAN,ZHEISHIHOUJISHISHISHIXILIULIANGSHANGSHENG,LAOSHIP0’<<ps,< p="">

即:P2<<p1,
澳门足彩  F’2<<f’1< p="">

SHANGSHUBIAOMIANKONGZHIFAYONGJINGFENGGUANXIANDELIULIANGZHANGLIANGJIUZHEIGUIYUZHEILEIQINGKUANG。

3.3PINGHENGFAXIELU

SHELIULIANGWEIF,P1=P1 -P1-,F’1=K,F’1WEIPINGHENGFAXIELUQIANDECHAYABIANSONGQI(DAIKAIFANG)SHUCHUZHI

WOMENJIADINGGUANDAONEILIUTILIULIANGZAIMEIYOUGAIDONGDEQINGKUANGXIAZUOFENXI

澳门足彩 SHEXIELUDEYALIWEIPS,

澳门足彩 ZE:XIELUHOUDEZHENGFUDAOYAGUANDEJINGYAWEI:

P2=P1 -PS,P2-=P1- PS
P2=P2 -P2-=P1-2PS,则
F’2=K=K

澳门足彩 JI:F’2<f’1,CHAYABIANSONGQIZHANGLIANGSHUCHUXIAOYUSHIXILIULIANGZHI< p="">CHAYABIANSONGQIZHANGLIANGSHUCHUXIAOYUSHIXILIULIANGZHI<>

澳门足彩 CHAYABIANSONGQI/DUOCANLIANGBIANSONGQI/DUOCANSHUBIANSONGQI/DUOCANSHULIULIANGBIANSONGQI/DUOBIANLIANGBIANSONGQI/CHAYALIULIANGBIANSONGQI/YALIBIANSONGQI

3.4气体流量导压管积液情况下的差压变送器丈量过失

YOUYUQITILIULIANGQUYABANFABUHEGUOSHIHUODAOYAGUANSHEBEIBUHESHIYANGQIU(YUSHUIPINGCHENGBUXIAOYU1:12DEXIEDUJIELIANXIAJIANG)SHI,CHANGCHANGGOUCHENGDAOYAGUANNEIBUJIYAYETIDEXIANXIANG。ZHEILEIXIANXIANGDEFANQI,WANGWANGHUIZHISHIZHANGLIANGJINJUE,JIARUZAICHAYABIANSONGQILIANGCHENGHENXIAODEQINGKUANGXIA,NAIZHIHUIGOUCHENGCHAYABIANSONGQISHUCHUDEYIXIEBUJIANDING。(YANSHENYUEDU...YALIBIANSONGQI)


如图4,莱钢年夜型1#1880高炉的煤气流量丈量系统,系统为节省孔板 差压变送器,取压办法为环室取压,煤气活动标的意图为向下,放空办法为安全斟酌,设为会集式排放。(延伸阅读...多参量变送器)

TU4

BENZHANGLIANGXITONGGANGTOUYONGSHIGONGZUOZHENGCHANG,GONGZUOYIDUANSHIJIANWANGHOU,CEDEDELIULIANGZHUZHOUBIANNIANYE,FANGKONGHOUZHENGCHANG,GONGZUOYIDUANSHIJIANHOU,CEDEDELIULIANGYOUZHUZHOUBIANNIANYE。(YANSHENYUEDU...YALIBIANSONGQI)

JINGGUOJIANCHA,ERCIBIAOMIAN(DCS)ZUTAIJIDIANQIHAOANHAOHUILUGONGZUOZHENGCHANG,CHAYABIANSONGQISONGJIANDINGSHIBIAODINGZHENGCHANG,YONGCELOUBIAOMIANCHALIANGTOUDAOGUANZHENGCHANG。JINGGUODUXI,WEIMEIQITUOSHUIDANDIAOBUJING,MEIQIZHONGHANSHUI,YOUYUYETIZISHANGERXIAHUODONG,YOUXIESHUIJIHEYUKONGBANZHENGYACE,BINGZHUJIANYANZHENGYADAOYAGUANHUODONGHUIJIZHIZUIXIADUAN,GOUCHENGZHENGFUDAOYAGUANZHONGJIYEGAODUBUYIZHI,CHAYABIANSONGQIZHANGLIANGFANQIZHENGXIANGGUOSHI,SHANXIANWEILIULIANGZENGNIANYE。(YANSHENYUEDU...DUOBIANLIANGBIANSONGQI)

FENXI:

澳门足彩 SHEZHENGDAOYAGUANQUYADIANYALIWEIP ,FUDAOYAGUANQUYADIANYALIWEIP-,CHAYABIANSONGQIZHENGDUANYALIWEIP ?,CHAYABIANSONGQIFUDUANYALIWEIP-?。

P=P -P-
澳门足彩 P’=P ?-P-?

ZHENGCHANGZHANGLIANGXIA:

P=P?

澳门足彩 SHEZHENGCHANGZHANGLIANGQINGKUANGXIADELIULIANGWEIF,ZEF=K

ZHEIERKWEICHANGXISHU。

SHEYETISHUIDEMIDUWEIρ,ZEZAIZHENGDAOYAGUANJIYEGAODUWEIh ,FUDAOYAGUANJIYEGAODUWEIh-DEQINGKUANGXIA:

P ?=P ρgh 
P-?=P- ρgh-
澳门足彩 P?=P ?-P-?=P ρh -(P- ρh-)=P ρ(h -h-)

澳门足彩 ZECHAYABIANSONGQISHUCHUWEI:

F?=K

当h >h-时差压变送器实习测得的差压增年夜,输出流量旗号暗号变年夜,
澳门足彩 当h <h-时差压变送器实习测得的差压减小,输出流量旗号暗号变小,< p="">差压变送器实习测得的差压减小,输出流量旗号暗号变小,<>

CHAYABIANSONGQI/DUOCANLIANGBIANSONGQI/DUOCANSHUBIANSONGQI/DUOCANSHULIULIANGBIANSONGQI/DUOBIANLIANGBIANSONGQI/CHAYALIULIANGBIANSONGQI/YALIBIANSONGQI

即:差压变送器丈量输出的流量旗号暗号与实习流量不符,发生丈量过失。

ZHEIER,YOUYUZHENGYADAOGUANQUYABANFADEYAOSU,GENZHESHIJIANDEZENGJIA,h ZHUJIANNIANYEYUh-,CEDEDELIULIANGYEZENGNIANYE。(YANSHENYUEDU...YALIBIANSONGQI)


经过典型缺点事例,对运用差压变送器的丈量回路由于导压管要素构成回路丈量缺点做了一些分析,这几种缺点都是在表面装备维护中很是多见的,经由进程分析可以看到,不管是导压管阻塞、仍是导压管中积水,一样的缺点,其表征出来的现象有时正本不一样,所以我们在分析疑问时应当是辩证的,具体情况具体分析。
4、竣事语

YISHANGWOMENTANTAOLECHAYABIANSONGQIDESHEBEIBANFA、ZHUZHONGSHIXIANGJICHAYABIANSONGQIZHANGLIANGHUILUQUEDIANDEQUEZHEN,SHIXISHANG,YOUYUYALIBIANSONGQIYUCHAYABIANSONGQIZHANGLIANGYUNYONGSHANGDEXIANGTONGXINGYAOSU,ZHEIPIANWENZHANGZHONGYOUXIEBANFAYEYIYANGSHIYONGYUYALIBIANSONGQIDESHEBEIHEQUEDIANQUEZHEN。(YANSHENYUEDU...YALIBIANSONGQI)

 

 

此文关键字:差压,变送器,在,运用,中的,故障,诊断,与,分析,
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