Lub neej ntev npaum li cas ntawm qhov tsis yog -hlau tiv thaiv raj txuas lub thawv hom thermocouple

Lub neej ntev ntawm cov khoom tsis yog{0}}hlau tiv thaiv tube hlws ris lub thawv hom thermocouples yog qhov tseem ceeb rau kev txiav txim siab hauv kev lag luam siab - daim ntawv thov ntsuas kub. Cov thermocouples no, siv cov khoom siv tsis yog-hlau hlau xws li alumina thiab silicon carbide rau lawv cov raj tiv thaiv, muaj qhov zoo heev -kub tsis kam thiab corrosion resistance, thiab tau dav siv nyob rau hauv huab cua kub xws li ceramic kilns, iav furnaces, thiab siab -kub sim rauv taws. Lawv lub neej kev pabcuam feem ntau yog nyob nruab nrab ntawm 3 thiab 8 xyoo, thiab nyob rau hauv kev ua haujlwm ruaj khov thiab nrog kev saib xyuas kom zoo, qee qhov kev siv tuaj yeem tshaj 10 xyoo.

I. Cov yam tseem ceeb cuam tshuam rau lub neej

Kub ua hauj thiab corrosion kuj ntawm cov khoom tiv thaiv tubing:

Tsis yog -cov hlau tiv thaiv cov raj (xws li alumina, silicon carbide, thiab silicon nitride) tuaj yeem tuav cov qauv kev ruaj ntseg siab tshaj 1300 degree, zoo dua rau cov khoom siv hlau. Txawm li cas los xij, nyob rau hauv qhov muaj zog txo cov cua los yog alkaline slag ib puag ncig, tshuaj lom neeg corrosion tseem tuaj yeem tshwm sim, ua rau thinning thiab tawg ntawm lub raj phab ntsa. Piv txwv li, silicon carbide yog nquag rau cov tshuaj tiv thaiv SiC + 2H₂ → Si + CH₄ hauv hydrogen- muaj huab cua, ua rau cov khoom decomposition.

Thermal shock thiab mechanical vibration:

Cov khoom tsis yog-cov khoom siv hlau yog cov nkig, thiab tsis tshua muaj thermal cycling lossis kev sib tsoo tshuab tuaj yeem ua rau cov microcracks yooj yim, uas tom qab ntawd nthuav tawm mus rau hauv pob txha. Tshwj xeeb tshaj yog nyob rau hauv kev sib cuam tshuam kiln nrog nquag pib-ups thiab shutdowns, tsub zuj zuj ntawm thermal stress yuav txo tau lub neej kev pab cuam.

Kev laus thiab tsis ua haujlwm ntawm cov qauv sealing:

Lub foob ntawm lub thawv sib txuas thiab cov khoom tsis yog- hlau tiv thaiv raj feem ntau yog siv cov roj hmab fiber ntau los yog siab - kub sealant. Nyob rau hauv lub sij hawm ntev - kub kub, cov ntaub ntawv no yog nquag carbonization thiab shrinkage, ua rau ya raws los yog plua plav intrusion, ua rau rwb thaiv tsev degradation los yog corrosion ntawm lub davhlau ya nyob twg kev twb kev txuas.

Degradation thiab paug ntawm cov thermocouple hlau:

Txawm hais tias muaj lub raj tiv thaiv, cov kab hluav taws xob tseem tuaj yeem nkag los ntawm micropores ntawm qhov kub thiab txias, ua rau xaiv oxidation lossis "ntsuab corrosion" ntawm cov khoom siv thermoelement (xws li K- hom thermocouples saum 900℃). Tsis tas li ntawd, cov tshuaj volatile nyob rau hauv lub cub tawg tso rau ntawm phab ntsa sab hauv ntawm lub raj tiv thaiv kuj tseem tuaj yeem cuam tshuam rau qhov ntsuas kub ntsuas qhov nrawm.

II. Siv Lifespan nyob rau hauv Hom Kev Ua Haujlwm Zoo

Daim ntawv thov Scenario	Hom Lifespan	Kev piav qhia
Ceramic Roller Kiln	5-8 xyoo	Ib puag ncig ruaj khov, tsis tshua muaj thermal cycling zaus, tiv thaiv raj tsis yooj yim puas
Iav Melting Rauv	3-5 xyoos	High temperature (>1200 degree) thiab alkaline vapor corrosion
Kev sim hluav taws xob rauv (Kev ua haujlwm tsis sib xws)	6-10 xyoo	Tsawg siv zaus, kev saib xyuas zoo, tsis tshua muaj thermal shock
Cement Rotary Kiln High-Tsub Cheeb Tsam	1-2 xyoos	Muaj zog thermal shock, plua plav yaig, thiab alkaline corrosion
Hlau Heat Treatment Rauv (Controlled Atmosphere)	4-6 xyoo	Tsawg cov khoom degradation nyob rau hauv nitrogen los yog argon tiv thaiv

III. Kev ntsuas tseem ceeb txhawm rau txuas lub neej ua haujlwm

Kev xaiv tsim nyog thiab kev sib tw ntawm kev ua haujlwm:

Nyob rau hauv ib puag ncig corrosive heev, ua qhov tseem ceeb ntawm silicon carbide los yog silicon nitride tiv thaiv tubes; Nyob rau hauv cov xwm txheej uas tsis tshua muaj thermal shock, siv gradient cov khoom siv los yog cov qauv sib xyaw (xws li txheej sab hauv corundum + txheej hlau casing) txhawm rau txhim kho kev tawg.

Optimize Installation Method:

Tsis txhob raug hluav taws xob ncaj qha rau thaj chaw cuam tshuam; thaum ntsia horizontally, ntxiv kev txhawb nqa brackets los tiv thaiv kev tawg vim qhov ntev cantilever ntev; qhov tob tob yuav tsum tsis pub tsawg tshaj 8-10 npaug ntawm sab nraud txoj kab uas hla ntawm lub raj tiv thaiv kom paub meej qhov ntsuas kub.

Txhim khu kev sib khi thiab kev tiv thaiv:

Siv siab - kub ceramic fiber gaskets thiab siab - kub sealant los kaw qhov sib koom ua ke; lub qhov hluav taws xob lub qhov hluav taws xob yuav tsum tig mus rau hauv qab kom tsis txhob muaj cov dej ntws rov qab rau hauv.

Siv Kev Tiv Thaiv Kev Tiv Thaiv:

Txheeb xyuas qhov kev sib khi thiab pom kev ncaj ncees ntawm lub thawv xaim txhua lub hlis twg;

Test the insulation resistance annually (between the thermocouple and the protection tube should be >100MΩ);

Ua ntawm -qhov chaw ntsuas qhov ntsuas txhua 6-12 lub hlis txhawm rau txheeb xyuas qhov ntsuas qhov ntsuas kub.

Tsim cov khoom siv Ledger:

Sau lub sijhawm teeb tsa, kev ua haujlwm kub nkhaus, pib / nres lub voj voog, thiab keeb kwm txhaum cai. Ua ntej hloov cov ntsiab lus uas tau siv rau ntau tshaj 5 xyoos lossis muaj lub tswb nrov, hloov ntawm "kev hloov pauv tsis ua haujlwm" mus rau "kev saib xyuas kwv yees."