Peb txheej ntawm rwb thaiv tsev rwb thaiv tsev, uas yog, hluav taws xob plhaw cov pa roj hmab ntawm cov roj teeb meem ntawm cov pa taws kub kom zoo rau lub plhaub reactor. Cov tshuaj tiv thaiv nyob rau hauv cov kev sib txuas ntawm kev sib txuas ntawm cov roj av muaj zog, thiab covRefractor Cibraug ntxuav los ntawm cov roj kub-roj, uas ua rau hnav txuas ntxiv mus thiab thinning. Tus nqi corrosion thaum lub sijhawm ua haujlwm yog 0. 02mm / d. Txawm li cas los xij, thaum cov pob zeb sib tsoo yog qhov txawv txav, tshwj xeeb yog ntau dua, feem ntau yog tom qab kev siv roj av refractories, uas tshwj xeeb tshaj yog tom qab kev ua haujlwm nyab xeeb thiab ruaj khov ntawm cov roj.
Cov thinning ntawm refractory brick ua rau lub cub hluav taws xob yooj yim rau overheat
Nyob rau hauv ib txwm muaj xwm txheej, muaj cov yeeb yaj kiab slag yuav raug tsim nyob rau saum npoo ntawm kev tawm tsam hluav taws los ntawm kev tua hluav taws thiab cov pa taws kub. Ua ntej, tom qab cov pob zeb thee nkag mus rau nkag mus rau hauv lub roj av, nws hlawv thiab roj ua pa nrog cov roj hauv dej nrog CO thiab H2 raws li lub ntsiab lus tseem ceeb. Tom qab cov tshuaj tiv thaiv tshauv, feem ntau ntawm cov khoom seem tshauv thiab ib qho me me ntawm cov neeg muaj peev xwm sib tsoo me me nrog cov npoo av recractories thiab raug ntes los ntawm phab ntsa cib refractory. MGo, FE2O3, thiab AL2O3 hauv cov hmoov tshauv thee yuav ua ke nrog CR2O3 los ua cov spense spinel, uas yog cov khoom ua yeeb yaj kiab tawv. Raws li qhov ntsuas kub ntawm cov tshauv slag deb ntawm cov txheej txheem slag Vim tias muaj lub hav zoov ntawm cov yeeb yaj kiab slag, qhov kev nkag mus ntawm cov pa roj hnyav thiab kub-kub molten shag yog raug rho tawm. Ib qho ntxiv, vim lub luag haujlwm ntawm kev rov qab cib thiab rwb thaiv tsev cib, lub cua sov phab ntsa ntawm lub roj cua sov ntawm lub gasifier yog tswj hwm ntawm ~ 230 degree. Nyob rau hauv tom qab theem tom qab, raws li cov refractory cib yog thinned, lub tshav dav hlau taws huab cua sov yuav maj mam nce. Feem ntau, cov cua sov phab ntsa kub<300℃ can maintain operation.
During the operation of the full coal condition, the furnace wall temperature of the gasifier did not become abnormal, but after the petroleum coke was mixed, the furnace wall temperature of the gasifier rose slightly. When the blending ratio of petroleum coke is >30%, phab ntsa kub tshaj 300 qib kaum ob peb zaug. Raws li kev tsom xam, cov laj thawj rau kev nce ntawm phab ntsa cua yog raws li hauv qab no:
Ergeity ntawm roj av co tsis zoo. Txhawm rau kom muaj qhov kub ntawm lub roj thiab txhim kho cov kev sib cais ntawm cov roj oxygen-cov oxygen-cov pa roj oxygen-cov roj ntsha ntau dua, uas yog lub hom phiaj rau qhov nce ntawm huab cua sov;
Vim tias qhov kev sib piv siab sib piv ntawm cov roj av coke, cov hmoov tshauv hauv cov cub tawg nyob rau hauv cov ntaub so ntawm cov nplais ntawm cov hluav taws xob taws. Los ntawm kev khij cov pa hluav taws xob refractory nyob rau hauv lub roj av, nws tau pom tias muaj kev sib cav sib ceg, thiab qee qhov kev ua yeeb yaj kiab uas tsis muaj slag thiab tsis ua ib qho kev ua yeeb yam ntawm cov yeeb yaj kiab. Qhov laj thawj tseem ceeb yog cov feem ntawm roj av coke sib xyaw. Thaum cov hmoov tshauv hauv cov roj av roj hmab roj av yog qhov muaj cov kab mob uas tsis txaus ntseeg, nws tuaj yeem ua rau cov pa hluav taws xob tsis txaus Cov tshauv sib koom ua ke ntawm cov tua hluav taws yog qhov txuas tsis muaj zog tshaj plaws. Cov av nkos refract nyob rau hauv cov pob qij txha tshauv yuav ntxuav tawm thaum lub sij hawm airflow entrainment entrainment. Cov pob qij txha yog thawj zaug rau ib puag ncig, thiab cov roj muaj dej siab yuav nkag mus rau ntawm cov cib pob qij txha, ua rau cov phab ntsa refractory, ua rau phab ntsa rauv taws kom sov.
Thaum cuam tshuam nrog kev overheating ntawm lub zog cua sov, ntsuas kom txo qis ntawm cov roj av rov qab ua rau cov roj av rov qab, thiab cov pob qij txha ntau dhau ntawm cov pob qij txha, thiab lub nraub qaum ntawm Airflow. Ib qho ntxiv, ntxiv rau ntau npaum li cas ntawm Sio2, CAO thiab FE2O3, peproleum coke txiv duaj slag Lub ntsiab lus melting ntawm v2o5 tsuas yog 670 degree, thiab thaum nws coexists nrog cr2o3, qhov qis tshaj plaws utectic kub yog 665 degree. Nyob rau hauv cov dej num pa taws, cov pob zeb rectractories tau nthuav tawm cov chaw ib puag ncig yog yooj yim yaj yam tsis muaj kev tiv thaiv ntawm cov yeeb yaj kiab slag.
Ua ke nrog qhov tseeb qhov xwm txheej, nws pom tias thaum cov kev sib xyaw ntawm roj av tshaj 40%, lub cub hluav taws xob cua sov dhau los thiab kev ua haujlwm tsis ruaj khov. Thaum cov kev sib xyaw sib xyaw yog 30%, txawm hais tias lub tshav dav hlau sov yog siab dua li ntawm cov 30% kev sib xyaw ntawm cov nyiaj tau los ntawm lub 30% siab dua li ntawm cov pa puv ntoob. Kev txiav txim siab kom muaj qhov kev txiav txim siab uas yuav tsum tau ua kom tiav thaum twg tov cov roj av coke, cov kev sib xyaw ua ke yuav tsum tau nruj me ntsis tswj<30% to avoid the occurrence of gas leakage in the brick joints.
Qhov sib ntxiv ntawm cov roj av coke ua rau muaj kev ntxhov siab erosion ntawm refractory cib
After the addition of petroleum coke, the carbon conversion rate of the gasifier gradually decreases. Under the full coal working condition, the carbon conversion rate of the gasifier is only 98%. After the addition of petroleum coke (fine ash is not burned back), the carbon conversion rate of the gasifier drops from 98% under the full coal working condition to 94%, and as the proportion of the addition is >30%, cov pa roj carbon hloov hluav taws xob zuj zus qis dua hauv qab 90%. Thaum tus nqi hloov pauv hloov pauv yog<88%, the wall capture efficiency of the gasifier decreases significantly. Although the capture efficiency of the furnace wall decreases, the residual carbon particles captured by the gasifier wall are slightly higher than those under normal working conditions. The captured residual carbon particles will consume oxygen and reduce the oxygen partial pressure on the surface of the refractory bricks.
Los ntawm kev soj ntsuam mus rau hauv qhov cub tawg, nws tau pom tias cov yaig no feem ntau tshwm sim hauv thaj chaw muaj sia nyob rau hauv qhov chaw tiv thaiv kev ua haujlwm ntawm qhov kev tiv thaiv thawj zaug. Thawj cov tshuaj tiv thaiv kev ua haujlwm ntawm cov kev tiv thaiv kev ua tau zoo yog rau kev sib txuas ntawm thaj chaw tiv thaiv. Qhov kub nyob hauv thaj chaw no yog qhov tseem ceeb, thiab cov nplaim taws kub ncav cuag 2200 degree. Cov hmoov tshauv thiab slag muaj fluidity zoo ntawm no, thiab cov tshuaj tiv thaiv yog kev ua phem. Nws tsis yooj yim rau lub swb los ua cov yeeb yaj kiab sib luag. Nws kuj pom tias qhov xwm txheej ntawm Gasifier ib yog loj dua li ntawm Gasifier B.
Nyob rau hauv ib txwm muaj xwm txheej, tus fe2o3 hauv cov thee slag yog txo rau Feo los ntawm kev cia siab cib ua ke nrog MgGO thiab AL2O3 hauv kev swb. Lub cr2O3 thiab Al2o3 hauv cov hluav taws kub hloov kho kom muaj cov txheej txheem ntom ntawm MG-AL-CR-FE Crange, yog li ua tiav "slag tawm tsam slag". Txawm li cas los xij, hauv cov cuab yeej no, vim muaj roj ntau dhau ntawm cov roj ntsha sib xyaw ua ke, cov pa roj carbon ntau, thiab cov nplais uas hloov dua siab tshiab, thiab cov nplais uas muaj cov pa roj carbon ntau. Ntau cov pa roj carbon ntau ua rau qhov tshwm sim ntawm qhov tshwm sim ntawm cov kev yaig ntxig ntawm refractory rab phom refractory. Raws li cov yaig uas tau pom ntawm recractories bricks thiab kev ntsuas ntawm cov txheej txheem thaum lub sijhawm ua haujlwm rau cov pob zeb ntxig ntawm cov pob zeb recous yog raws li hauv qab no:
① Nyob rau hauv cov pa roj kev ib puag ncig ntawm cov cuab yeej siv hluav taws xob ib nrab, thiab cov tshuaj lom neeg uas tsis tshua muaj ntsej muag, thiab cov tshuaj tiv thaiv slag
② Nyob rau hauv ib txwm muaj, cov pa oxygen ib puag ncig hauv cov pa roj carbon monoxide, tab sis nws muaj qhov ua tau zoo ntxiv, thiab muaj kev sib cav sib ceg precipitated los ntawm slag, yog li ntawd cov cr2o3 hauv cov khoom siv chromium yog cov khoom tawg, thiab cov khoom siv chromium ntau dua los ntawm cov nplais;
③ Hauv cov huab cua no, tom qab uas tsis muaj kev tiv thaiv cov pa roj carbon liab, nws yog qhov yooj yim los ua cov chromium carbides, ua rau bubbling nyob rau saum npoo ntawm cov reci recractories bricks. Kev tsom xam ntawm cov ntaub ntawv operating tseem pom tias vim li cas lub sijhawm ua haujlwm ntawm roj av b yog ntau tshaj li 2 lub hlis
The main reason for the porous erosion of refractory bricks in this device is that there is excessive unreacted residual carbon on the firebricks, which causes the oxygen partial pressure of the system to be extremely low, thereby inducing porous erosion of refractories bricks. To solve the problem of porous erosion of fire bricks from the root, we should also start from improving the carbon conversion rate, increase the reaction temperature of the gasifier, ensure that the carbon conversion rate is >95%, thiab tib lub sijhawm tsim nyog ua kom lub cev ua haujlwm ntawm cov roj pleev lub sijhawm, txuas ntxiv lub sijhawm hloov pauv ntawm cov roj carbon.
