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感知“利”器—可燃气体传感器

时间:2020-08-04 14:05来源:evccode.com 作者:大盛 点击:

KERANQITIZUOWEIQINGJIENENGYUANZAIGONGYEHEJUMINSHENGHUOZHONGYOULEGUANGFANDEYINGYONG,KERANQITIYIDANFASHENGXIELU,KENENGFASHENGZHONGDU、BAOZHADENGYANZHONGHOUGUO。JINNIANLAILIANXUFASHENGDEDUOQIRANQIBAOZHAANQUANSHIGUZAIYICIJIWOMENSHENBIANDERANQIANQUANWENTIQIAOXIANGLEJINGZHONG。YICICICANTONGDERANQIANQUANSHIGUGAOSUWOMEN,CAIQUYOUXIAODESHOUDUAN,TIGAORANQIANQUANYINHUANDEFANGFANNENGLI,JIAQIANGDUIRANQIXIELOUYIJIRANSHAOCHANWUDEJIANKONGFEICHANGZHONGYAO。

什么是可燃气体?

图源网络

万能彩票中奖神器 KERANQITISHIZHINENGGOUYINRANQIEZAICHANGWENCHANGYAXIACHENGQITIZHUANGTAIDEWUZHI,NENGGOUYUKONGQI(HUOYANGQI)ZAIYIDINGNONGDUFANWEINEIJUNYUNHUNHEXINGCHENGYUHUNQI,YUDAOHUOYUANHUIFASHENGBAOZHA,RANSHAOGUOCHENGZHONGSHIFANGCHUDALIANGNENGLIANGDEQITI。

可燃气体种类有很多,如甲烷(CH4)、乙烷(C2H6)、丙烷(C3H8)、丁烷(C4H10)、氢气(H2万能彩票中奖神器)、一氧化碳(CO)、天然气、液化石油气、城市煤气、高炉煤气等。

KERANQITIYIDANXIELOU,GAIRUHEFAXIANTA,BIMIANSHIGUFASHENGNI?

图/各类气体爆炸极限

可燃气体传感器的种类?

万能彩票中奖神器 RANQIBAOJINGQI,SHIYIZHONGRANQIANQUANFANGFANCHANPIN,DANGRANQIZAIKONGQIZHONGDENONGDUCHAOGUOSHEDINGZHI,KERANQITICHUANGANQIBIANHUIBEICHUFACHANSHENGBAOJING。KERANQITICHUANGANQIZHUYAOYOUYANGHUAWUBANDAOTIXING、CUIHUARANSHAOXING、DIANHUAXUESHIXINGYIJIHONGWAIXING。

 01  氧化物半导体型可燃气体传感器

JINSHUYANGHUAWUBANDAOTIZAIKONGQIZHONGBEIJIAREDAOYIDINGWENDUSHI,YANGYUANZIBEIXIFUZAIDAIFUDIANHEDEBANDAOTIBIAOMIAN,BANDAOTIBIAOMIANDEDIANZIHUIBEIZHUANYIDAOXIFUYANGSHANG,YANGYUANZIJIUBIANCHENGLEYANGFULIZI,TONGSHIZAIBANDAOTIBIAOMIANXINGCHENGYIGEZHENGDEKONGJIANDIANHECENG,DAOZHIBIAOMIANSHILEISHENGGAO,CONGERZUAIDIANZILIUDONG(JIANTU1)。

半导体可燃气体传感器原理

ZAIMINGANCAILIAONEIBU,ZIYOUDIANZIBIXUCHUANGUOJINSHUYANGHUAWUBANDAOTIWEIJINGLIDEJIEHEBUWEI(JINGJIE)CAINENGXINGCHENGDIANLIU。YOUYANGXIFUCHANSHENGDESHILEITONGYANGCUNZAIYUJINGJIEERZUAIDIANZIDEZIYOULIUDONG,CHUANGANQIDEDIANZUJIYUANYUZHEIZHONGSHILEI。ZAIGONGZUOTIAOJIANXIADANGCHUANGANQIYUDAOHAIYUANXINGQITISHI,YANGFULIZIYINYUHAIYUANXINGQITIFASHENGYANGHUAHAIYUANFANYINGERDAOZHIQIBIAOMIANNONGDUJIANGDI,SHILEISUIZHIJIANGDI(JIANTU2),DAOZHICHUANGANQIDEZUZHIJIANXIAO。

图/半导体可燃气体传感器

 02  催化燃烧型可燃气体传感器

催化燃烧式气体传感器万能彩票中奖神器由对可燃气体进行反应的检测元件(D)和不与可燃气体进行反应的补偿元件(C)2个部分构成。如果存在可燃气体的话,只有检测元件表面可以燃烧,因此检测元件温度上升使检测元件的电阻增加。

万能彩票中奖神器 XIANGFAN,YINWEIBUCHANGYUANJIANBURANSHAO,QIDIANZUBUFASHENGBIANHUA。ZHEIXIEYUANJIANZUCHENGHUISITONGDIANQIAOHUILU,BUCUNZAIKERANQITIDEFENWEIZHONG,KEYIDIAOZHENGKEBIANDIANZU(VR)RANGDIANQIAOHUILUCHUYUPINGHENGZHUANGTAI。RANHOU,DANGQITICHUANGANQIBAOLUYUKERANQITIZHONGSHI,ZHIYOUJIANCEYUANJIANDEDIANZUSHANGSHENG,YINCIDIANQIAOHUILUDEPINGHENGBEIDAPO,ZHEIGEBIANHUABIAOXIANWEIBUJUNHENGDIANYA(Vout)ERKEYIBEIJIANCECHULAI。

图/催化燃烧型可燃气体传感器

 03  电化学型可燃气体传感器

万能彩票中奖神器 CHUANGANQIYOUGUIJINSHUCUIHUAJIDEJIANCEJI、DUIJIYULIZICHUANDAOTIGOUCHENG。DANGCODENGKERANJIANCEDUIXIANGQITICUNZAISHI,ZAIJIANCEJICUIHUAJISHANGYUKONGQIZHONGDESHUIZHENGQIFASHENG①SHISUOSHIDEFANYING。

CO + H2O → CO2+ 2H+ + 2e- …①

JIANCEJIYUDUIJIJIETONGDIANLIU(DUANLU)HOU,JIANCEJICHANSHENGDEZHIZI(H+)YUTONGSHICHANSHENGDEDIANZI(e-)FENBIETONGGUOLIZICHUANDAOTIYUWAIBUDIANXIAN(YINXIAN)GEZIDAODADUIJI,ZAIDUIJISHANGYUKONGQIZHONGDEYANGZHIJIANFASHENG②SHISUOSHIDEFANYING。

(1/2)O2 + 2H+ + 2e- → H2万能彩票中奖神器O …②

万能彩票中奖神器 YEJIUSHISHUOCICHUANGANQIGOUCHENGLEYOU①、②FANYINGSHIXINGCHENGDE③FANYINGSHIDEQUANDIANCHIFANYING,KEYIRENWEISHIJIANGQITIZUOWEIHUOXINGWUZHIDEDIANCHI。

CO + (1/2)O2 → CO2 …③

万能彩票中奖神器 DANGZUOQITICHUANGANQISHIYONGSHI,JIETONGJIANCEJIYUDUIJIDEDIANLIU,LAICEDINGQIDUANLUDIANLIU。

图/电化学型可燃气体传感器

 04  红外型可燃气体传感器

红外型可燃气体传感器, 运用非色散红外(NDIR)原理对空气中存在的碳氢类可燃气体进行检测。

NDIR(non-dispersive infrared)SHIQITICHUANGANQISHITONGGUOYOURUSHEHONGWAIXIANYINFADUIXIANGQITIDEFENZIZHENDONG,LIYONGQIKEXISHOUTEDINGBOZHANGHONGWAIXIANDEXIANXIANGLAIJINXINGQITIJIANCEDE。HONGWAIXIANDETOUSHELV(TOUSHEGUANGQIANGDUYUYUANZIFUSHEYUANDEFANGSHEGUANGQIANGDUZHIBI)QUJUEYUDUIXIANGQITIDENONGDU。YONGZHONGBODUANHONGWAIXIANZHAOSHEQITIHOU,YOUYUQITIFENZIDEZHENDONGSHUYUHONGWAIXIANDENENGJICHUYUTONGYIGEGUANGPUFANCHOU,HONGWAIXIANYUFENZIDEGUYOUZHENDONGSHUFASHENGGONGZHENHOU,ZAIFENZIZHENDONGSHIBEIQITIFENZISUOXISHOU,QITINONGDUYUHONGWAIXIANTOUSHELVDEGUANXIFUHELANGBO-BIERDINGLV。

图/MH-440D红外甲烷传感器

如何选型?

DUIKERANQITIXIELOUJIANCE,TEBIESHIZHENDUIJIAYONGCHANGSUO,ZAIKERANQITIJIAODIDEXIELOUNONGDUSHIYAOQIUNENGKUAISUDEJIANCECHULAI,NENGSHIXIANDANDIANBAOJINGJIKE。LINGWAI,RANQIBAOJINGQIGONGZUOYUYIBANDEJIATING,BIXUNENGMANZUZHANGQIMIANWEIHUDEYAOQIU,BANDAOTICHUANGANQIJIANCEGUOCHENGJINCUNZAIQITIDEXIFUHETUOFUGUOCHENG,CHUFANGNEIYANZHONGDEYOUYANJISHAOCUNLIUYUMINGANCAILIAOBIAOMIAN,BUHUIYINGXIANGQISHIJISHIYONGSHOUMING,YINCI,JIANCEXIAXIANJIAODI、SHIYONGSHOUMINGJIAOZHANGBANDAOTIQITICHUANGANQISHIJIAYONGBAOJINGQIDEZUIJIAXUANZE。

万能彩票中奖神器 CUIHUARANSHAOQITICHUANGANQIDEJINGDUJIAOGAO,SHIHEMEIKUANG、SHIYOU、HUAGONG、RANQIDENGLINGYUDEDINGLIANGJIANCE。DANQIGONGZUOWENDUGAO,CUIHUAJIYISHIHUO,TONGSHIZHOUWEIHUANJINGNEICUNZAIDEJIAONIANJI、XIANGJIAOZHIPINSHIFANGCHUDEYOUJIGUI、LIUHUAWUJIYIRANGCUIHUAJIZHONGDU,DAOZHICHUANGANQIWANQUANSHIXIAO。ZAIGONGYECHANGSUO,YIBANTONGGUOBIAOZHUNQITIDINGQIXIAOJIANBAOJINGQI,DIAOZHENGFANGDABEISHU,FANGZHICUIHUACHUANGANQILINGMINDUSHUAIJIANDAOZHIJINGDUDAFUDUBIANCHA。

针对人工煤气和不完全燃烧过程中低浓度一氧化碳的检测,因一氧化碳的高毒性,报警点一般不超过200ppm,为了防止误报或漏报警,最好选用灵敏度和精度均较高的电化学气体传感器

NDIRCHUANGANQIJINJISHINIANLAIZAIZUOYEHUANJINGANQUANHEQITIJIANCEFANGMIANFAHUILEZHONGYAOZUOYONG。DANGCUIHUARANSHAOSHICHUANGANQIBUSHIHESHIYONGSHI,NDIRCHUANGANQIZESHILINGYIXIANGKEKAODEXUANZE。YUCUIHUARANSHAOSHICHUANGANQIBUTONG,NDIRCHUANGANQIBUXUYAOPINFANDEZHONGXINXIAOZHUN,ERQIETAMENBUYIZHONGDU。

图/可燃气体选型导图

 

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