Ntau tus neeg tsis tau hnov txog triethyl aluminium (TEAL), tab sis nws ua lub luag haujlwm tseem ceeb hauv kev tsim cov khoom uas tib neeg tuaj yeem pom thiab kov txhua hnub. TEAL yog ib qho organoaluminium (carbon thiab aluminium) cov khoom siv los tsim cov khoom siv high-density thiab low-density plastics, rubber, pharmaceuticals, semiconductors, thiab polymers xav tau rau "fatty alcohol" hauv cov tshuaj ntxuav tes thiab tshuaj ntxuav tes.
Polymers ua haujlwm los ntawm kev sib txuas ib tus neeg molecules (los yog monomers) rau hauv cov saw loj uas tuaj yeem siv los ua cov khoom. Nyob rau hauv cov organic polymers, lub caj qaum ntawm cov chains yog cov carbon thiab organometallic compounds, xws li TEAL. Cov tebchaw no muab cov pa roj carbon xav tau rau cov tshuaj tiv thaiv polymerization. Hauv kev tsim khoom ntawm qee cov khoom siv ntau tshaj plaws, kev sib xyaw ntawm TEAL thiab titanium tetrachloride tuaj yeem tsim Ziegler-Natta catalysts. Qhov no yog cov catalyst xav tau los pib cov tshuaj tiv thaiv uas ua rau muaj cov kab tawm olefin polymerization los tsim polyethylene thiab polypropylene.
Txhua lub Hoobkas uas khw muag khoom lossis ua cov txheej txheem TEAL yuav tsum tau them sai sai rau qhov tsis muaj zog ntawm cov tshuaj. TEAL yog pyrophoric, uas txhais tau hais tias nws yuav hlawv thaum raug huab cua. Qhov tseeb, cov tshuaj tiv thaiv muaj zog ntawm cov tshuaj no nrog cryogenic kua oxygen yog ib qho ntawm cov laj thawj rau nws siv raws li thawj theem foob pob hluav taws igniter ntawm SpaceX qhov kev pab cuam. Tsuas yog ib qho yuav tsum tau hais: kev saib xyuas hnyav yuav tsum tau ua thaum tuav cov khoom no. Rau cov tuam txhab yas uas siv cov tshuaj no txhua hnub, tsuas yog cov twj tso kua mis tsim tshwj xeeb rau daim ntawv thov no tuaj yeem siv tau. Kev saib xyuas ntxiv yuav tsum tau coj los xyuas kom meej tias cov catalyst tsis raug huab cua thaum ua haujlwm.
Thaum xaiv lub twj tso kua mis rau TEAL daim ntawv thov, qhov tseeb yog qhov tseem ceeb tshaj plaws. Txhua txheej txheem tshuaj ua raws li cov qauv tshwj xeeb. Kev txhaj tshuaj ntau dhau lossis tsawg dhau ntawm cov khoom xyaw tseem ceeb yuav tsis tsim cov txiaj ntsig xav tau. Metering twj uas muaj peev xwm tshwj xeeb txhaj cov tshuaj uas yuav tsum tau (nrog rau qhov tseeb ntawm +/- 0.5%) yog thawj qhov kev xaiv rau cov tuam txhab tshuaj TEAL daim ntawv thov.
Hais txog kev khiav thiab siab, TEAL feem ntau ntsuas nrog qhov ntim tsawg dua 50 nkas loos ib teev (gph) thiab lub siab tsawg dua 500 phaus ib square inch ntsuas (psig), uas yog nyob rau hauv qhov ntau ntawm cov metering twj tso kua mis. Qhov tseem ceeb ntawm cov txheej txheem polymerization yog tag nrho ua raws li American Petroleum Institute (API) 675 cov cai, raug thiab ntseeg tau. TEAL nyiam cov twj tso kua mis tsim los ntawm 316 stainless hlau kua kawg, 316 LSS pob valve thiab lub rooj zaum, thiab polytetrafluoroethylene (PTFE) diaphragm kom ntev lub neej ntawm cov tshuaj lom neeg no.
Kev nyab xeeb thiab kev ntseeg tau Lub tshuab hydraulically tsav diaphragm (HAD) metering twj tso kua mis tuaj yeem ua haujlwm tau ntau xyoo thiab muaj lub sijhawm ntev ntawm kev saib xyuas (MTBR). Qhov no feem ntau yog vim qhov tsim ntawm lub twj tso kua mis. Nyob rau hauv cov kua kawg, qhov ntim thiab siab ntawm cov kua hydraulic ntawm ib sab ntawm lub diaphragm yog sib npaug rau lub siab ntawm cov txheej txheem kua nyob rau sab nraud, kom lub diaphragm tswj qhov sib npaug ntawm ob lub kua. Lub piston ntawm lub twj tso kua mis yeej tsis kov lub diaphragm, nws txav cov roj hydraulic mus rau hauv lub diaphragm, ua rau nws khoov txaus kom txav mus rau qhov yuav tsum tau ua ntawm cov kua dej. Qhov kev tsim no tshem tawm qhov kev ntxhov siab ntawm lub diaphragm thiab muaj lub neej ua haujlwm ntev dua.
Txawm hais tias kev ua neej ntev yog qhov tseem ceeb, qhov tseem ceeb yuav tsum tau muab rau kev ntseeg siab yam tsis muaj qhov to. Metering twj rau TEAL daim ntawv thov yuav tsum tau nruab nrog ib qho kev kuaj li qub kom txo tau txoj kev xau. Sab nraud 4-bolt khi pas nrig muab kev ruaj khov thiab txhim khu kev qha yeeb nkab txuas. Rau lub sijhawm ntev, kev co sab nraud ntawm cov yeeb nkab txuas tuaj yeem ua rau cov dej xau thiab cov teeb meem loj ntawm lub twj tso kua mis.
PTFE diaphragm muaj cov ntaub ntawv zoo hauv kev siv TEAL. Cov twj tso kua mis no yuav tsum muaj ob lub diaphragm nrog kev ua kom pom kev, xws li lub ntsuas ntsuas siab lossis kev sib txuas ntawm qhov ntsuas siab thiab hloov mus ceeb toom txog cov teeb meem uas yuav tshwm sim.
Raws li ib txheej thib peb ntawm kev tiv thaiv, daim pam nitrogen hauv lub hydraulic casing thiab gearbox yuav tiv thaiv cov kua pyrophoric los ntawm huab cua.
Kev saib xyuas Lub valve ntawm lub ntsuas ntsuas, uas khiav ntawm 150 strokes ib feeb, 365 hnub hauv ib xyoos, yuav qhib thiab kaw ntau dua 70 lab zaug hauv ib xyoos. Cov txheej txheem kev saib xyuas lossis KOP (kwv dej) cov khoom siv muab cov khoom xav tau los hloov lub twj tso kua mis daim tshev valve, uas kuj suav nrog diaphragms, O-rings thiab cov ntsaws ruaj ruaj. Raws li ib feem ntawm kev tiv thaiv kev saib xyuas, nws yuav tsum muaj xws li hloov cov roj hydraulic ntawm lub twj tso kua mis.
Qhov kev thov rau cov khoom siv tiv thaiv tus kheej (PPE), ua ke nrog cov nqi roj tsawg los txo cov nqi ntawm cov khoom siv raw, txhais tau tias muaj kev tsim khoom ntau ntxiv thiab xav tau cov khoom siv hluav taws xob tsis zoo (xws li TEAL).
Jesse Baker yog tus thawj coj ua lag luam ntawm Pulsafeeder kev muag khoom, tswj cov khoom lag luam, engineering thiab pab pawg neeg siv khoom. Koj tuaj yeem tiv tauj nws ntawm jbaker@idexcorp.com. Yog xav paub ntxiv, thov mus saib hauv www.pulsafeeder.com.
Post lub sij hawm: Jan-20-2021
