{"id":718,"date":"2026-10-28T21:32:22","date_gmt":"2026-10-28T13:32:22","guid":{"rendered":"https:\/\/siliconcarbide.net\/?p=718"},"modified":"2026-10-28T21:32:22","modified_gmt":"2026-10-28T13:32:22","slug":"pse-tubat-mbrojtes-te-termokuplave-deshtojne-heret-ose-devijojne-ne-furrat-me-qelq","status":"publish","type":"post","link":"https:\/\/siliconcarbide.net\/sq\/why-thermocouple-protection-tubes-fail-early-or-drift-in-glass-furnaces\/","title":{"rendered":"Pse tubat mbrojt\u00ebs t\u00eb termokuplave d\u00ebshtojn\u00eb her\u00ebt ose devijojn\u00eb n\u00eb furrat me qelq"},"content":{"rendered":"<p dir=\"auto\"><strong>Pse tubat mbrojt\u00ebs t\u00eb termokuplave d\u00ebshtojn\u00eb her\u00ebt ose devijojn\u00eb n\u00eb furrat me qelq<\/strong><\/p>\n<p dir=\"auto\">Pas dymb\u00ebdhjet\u00eb vjet\u00ebsh mb\u00ebshtetjeje t\u00eb operacioneve t\u00eb shkrirjes s\u00eb xhamit, nj\u00eb problem i p\u00ebrs\u00ebritur \u00ebsht\u00eb se leximet e termokuples devijojn\u00eb gradualisht ose tubi mbrojt\u00ebs d\u00ebshton shum\u00eb p\u00ebrpara fushat\u00ebs s\u00eb planifikuar. Temperatura e furr\u00ebs \u00ebsht\u00eb e q\u00ebndrueshme dhe elementi i termokuples \u00ebsht\u00eb tipi i duhur, megjithat\u00eb temperatura e treguar ndryshon me dhjet\u00ebra grad\u00eb ose tubi \u00e7ar\u00ebsohet ose hollohet n\u00eb vij\u00ebn e xhamit ose n\u00eb hap\u00ebsir\u00ebn e djegies. Faktor\u00ebt themelor\u00eb jan\u00eb shkalla e korrozionit nga avujt alkalin\u00eb ose qelqi i shkrir\u00eb dhe p\u00ebr\u00e7ueshm\u00ebria termike e materialit t\u00eb tubit, t\u00eb cil\u00ebt s\u00eb bashku p\u00ebrcaktojn\u00eb si jet\u00ebgjat\u00ebsin\u00eb ashtu edhe vones\u00ebn n\u00eb p\u00ebrgjigjen e temperatur\u00ebs.<\/p>\n<p dir=\"auto\">Tubat e aluminas\u00eb (zakonisht 99 % Al\u2082O\u2083) rezistojn\u00eb mjaft mir\u00eb ndaj sulmit nga qelqi i shkrir\u00eb dhe avujt alkal\u00eb p\u00ebr shkak t\u00eb stabilitetit t\u00eb tyre kimik, por kan\u00eb p\u00ebr\u00e7ueshm\u00ebri termike t\u00eb moderuar (rreth 25\u201330 W\/m\u00b7K) dhe rezistenc\u00eb t\u00eb kufizuar ndaj goditjes termike. Tubat prej karbidi silikoni, ve\u00e7an\u00ebrisht ato t\u00eb sinteruara ose t\u00eb rikristalizuara, ofrojn\u00eb p\u00ebr\u00e7ueshm\u00ebri termike m\u00eb t\u00eb lart\u00eb (shpesh 30\u201350 W\/m\u00b7K ose m\u00eb shum\u00eb) dhe rezistenc\u00eb m\u00eb t\u00eb mir\u00eb ndaj goditjeve termike, gj\u00eb q\u00eb redukton vones\u00ebn e p\u00ebrgjigjes, por disa lloje mund t\u00eb p\u00ebsojn\u00eb oksidim n\u00eb sip\u00ebrfaqe ose reaksione n\u00eb atmosfera fort alkaline. Korrozioni ndodh p\u00ebrmes reaksionit t\u00eb oksideve alkaline me sip\u00ebrfaqen e tubit, duke formuar nj\u00eb shtres\u00eb me pik\u00eb t\u00eb ul\u00ebt t\u00eb shkrirjes q\u00eb shp\u00ebrb\u00ebhet ngadal\u00eb ose shk\u00ebputet. N\u00eb pozicionet e zhytjes sulmi \u00ebsht\u00eb m\u00eb i shpejt\u00eb; n\u00eb kuror\u00eb ose n\u00eb superstruktur\u00eb sulmi nxitet nga kondensimi i avullit. Zbehja e murit rrit rrezikun e d\u00ebshtimit mekanik, nd\u00ebrsa nj\u00eb mur i trash\u00eb ose me conductivitet t\u00eb ul\u00ebt rrit konstant\u00ebn e koh\u00ebs s\u00eb matjes.<\/p>\n<p dir=\"auto\">N\u00eb nj\u00eb furr\u00eb me en\u00eb qelqi q\u00eb funksionon n\u00eb 1450\u20131500 \u00b0C, dy tuba mbrojt\u00ebs me fund t\u00eb mbyllur u instaluan krah p\u00ebr krah n\u00eb kuror\u00eb p\u00ebr 90 dit\u00eb. Tuba alumina (muri origjinal 6 mm) tregoi nj\u00eb hollim mesatar prej 1.2 mm n\u00eb zon\u00ebn m\u00eb t\u00eb nxeht\u00eb dhe nj\u00eb konstant\u00eb kohe t\u00eb matur prej rreth 45 sekondash kur u ndryshua ngarkesa e djeg\u00ebsit. Tubi i karbidi i silicit i sinteruar (muri origjinal 5 mm) tregoi hollim prej 0.7 mm n\u00eb t\u00eb nj\u00ebjtat kushte dhe nj\u00eb konstant\u00eb kohe prej rreth 28 sekondash. Nuk u shfaq\u00ebn \u00e7arje p\u00ebrmes n\u00eb asnj\u00eb nga tubat. Pas heqjes, sip\u00ebrfaqja e aluminas\u00eb kishte nj\u00eb shtres\u00eb t\u00eb holl\u00eb reaksioni q\u00eb p\u00ebrmbante natrium dhe kalium; sip\u00ebrfaqja e karbidi i silikonit kishte nj\u00eb shtres\u00eb t\u00eb holl\u00eb silike me dep\u00ebrtim t\u00eb kufizuar t\u00eb alkalive. Matjet e temperatur\u00ebs nga tubi i karbidi i silikonit ndjekin m\u00eb ngusht\u00eb ndryshimet e procesit, nd\u00ebrsa tubi i aluminas\u00eb vonohej mjaftuesh\u00ebm p\u00ebr t\u00eb k\u00ebrkuar nj\u00eb zon\u00eb t\u00eb vdekur m\u00eb t\u00eb madhe kontrolli.<\/p>\n<p dir=\"auto\">Zgjedhja e tubit, p\u00ebr rrjedhoj\u00eb, balancon rezistenc\u00ebn ndaj korrozionit me konduktivitetin termik dhe trash\u00ebsin\u00eb e murit p\u00ebr vendndodhjen specifike. P\u00ebr kontrollin e korrozionit t\u00eb furr\u00ebs me xham n\u00eb tubin mbrojt\u00ebs t\u00eb termokupl\u00ebs, variablat praktike jan\u00eb past\u00ebrtia e materialit, dend\u00ebsia dhe ekspozimi ndaj avullit alkal kundrejt kontaktit t\u00eb drejtp\u00ebrdrejt\u00eb me xhamin. Performanca e xhamit t\u00eb mb\u00ebshtjell\u00ebsit t\u00eb termokupl\u00ebs me alumina kundrejt asaj me SiC konfirmohet duke matur humbjen e trash\u00ebsis\u00eb s\u00eb murit dhe koh\u00ebn e p\u00ebrgjigjes n\u00ebn t\u00eb nj\u00ebjtat kushte t\u00eb furr\u00ebs, n\u00eb vend q\u00eb t\u00eb bazohet vet\u00ebm n\u00eb t\u00eb dh\u00ebnat laboratorike t\u00eb korrozionit. Jet\u00ebgjat\u00ebsia e tubit t\u00eb termocuples p\u00ebr xham t\u00eb shkrir\u00eb zgjatet kur materiali i reziston si sulmit kimik ashtu edhe goditjes termike n\u00eb temperatur\u00ebn e funksionimit. Kur leximet devijojn\u00eb ose tubat d\u00ebshtojn\u00eb her\u00ebt, d\u00ebshmia konfirmuese jan\u00eb matjet e trash\u00ebsis\u00eb s\u00eb murit dhe vonesa e v\u00ebrejtur gjat\u00eb nj\u00eb ndryshimi t\u00eb njohur t\u00eb temperatur\u00ebs. Zgjedhja e nj\u00eb tubi me p\u00ebr\u00e7ueshm\u00ebri m\u00eb t\u00eb lart\u00eb dhe rezistenc\u00eb t\u00eb mjaftueshme ndaj korrozionit, si\u00e7 tregohet nga reduktimi i hollimit nga 1.2 mm n\u00eb 0.7 mm dhe i konstant\u00ebs s\u00eb koh\u00ebs nga 45 s n\u00eb 28 s n\u00eb krahasimin e kuror\u00ebs, p\u00ebrmir\u00ebson si p\u00ebrgjigjen e matjes ashtu edhe jet\u00ebgjat\u00ebsin\u00eb n\u00eb sh\u00ebrbimin e furr\u00ebs s\u00eb xhamit.<\/p>","protected":false},"excerpt":{"rendered":"<p>Why Thermocouple Protection Tubes Fail Early or Drift in Glass Furnaces After twelve years supporting glass melting operations, a repeated issue is that thermocouple readings gradually drift or the protection tube fails well before the scheduled campaign. The furnace temperature is stable and the thermocouple element is the correct type, yet the indicated temperature shifts&hellip;&nbsp;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[30],"tags":[],"class_list":["post-718","post","type-post","status-publish","format-standard","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/posts\/718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/comments?post=718"}],"version-history":[{"count":2,"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/posts\/718\/revisions"}],"predecessor-version":[{"id":720,"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/posts\/718\/revisions\/720"}],"wp:attachment":[{"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/media?parent=718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/categories?post=718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbide.net\/sq\/wp-json\/wp\/v2\/tags?post=718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}