01 System khoom
Muaj ob lub 1, 000 MW ultra-supercritical thee-fired units (No. 3 thiab No. 4) tau teeb tsa hauv Lub Hwj Chim B ntawm lub tuam txhab tsim hluav taws xob tsim hluav taws xob, txhua tus tau nruab nrog ob lub tshuab nqus dej rau Tsav cov twj tso kua mis feedwater, thiab tsis muaj hluav taws xob feedwater twj.
Txhua lub twj tso kua mis feedwater yog nruab nrog ib qho kev ywj pheej lubricating roj system, nrog rau ob pawg ntawm cov phaj me me hloov pauv, ib qho ua haujlwm thiab ib qho nyob rau hauv standby, siv cov dej txias kaw ua cov dej txias. Lub tshav kub exchanger phaj yog 0.5 hli tuab thiab txhua phaj yog nruab nrog lub sealing gasket. Cov phaj yog nruab nrog ib lub thav duab, lub kaum sab xis ntawm kev sib hloov ntawm daim hlau uas nyob ib sab yog 180 degree, lub phaj ntim los tsim cov kab sib txuas, cov phaj kub sib hloov ntawm ob sab ntawm cov roj, dej thiab ob hom kev tshaj tawm rau hauv cov channel tsim nyog, cia siab rau lub tshav kub exchanger phaj kom hloov qhov kub qhov sib txawv kom ua tiav lub luag hauj lwm ntawm txias roj kub.
02 Kev huam yuaj
Kaw lub twj tso kua mis txias tsis tu ncua, pib No. 2 kaw dej txias twj tso kua mis, khiav ib txwm, 11:07 nres No. 1 kaw dej txias twj tso kua mis, No. 1, No. 2 pub twj turbine tripped ib tom qab lwm, 85 ms sib nrug, MEH tripped thawj tawm ntawm "lubricating roj siab yog tsawg" (taw tus nqi ntawm 0.07 MPa). Tshawb xyuas keeb kwm nkhaus pom tias cov twj tso kua mis turbine lubricant siab qis, stator txias dej ntws tsis tshua muaj tswb, muab tso rau tib lub sij hawm nrog lub kaw txias dej twj tso kua mis hloov. 11:{{20}}7:08 nres No. 1 kaw dej txias twj tso kua mis; 11:07:11 kaw dej txias yeeb nkab siab ntawm 0.78 MPa dheev poob mus rau 0.56 MPa (tsawg kawg), cov dej siab hloov pauv ntau ntawm 0.22 MPa; 11: 07: 11 ob lub twj tso kua mis tso tawm ntawm lub sijhawm ntawm 85 ms, MEH tripped thawj zaug ntawm "lube roj siab" (tus nqi tas li ntawm 0.07 MPa). 07:11 2 pub twj tso kua mis turbine lubricant siab qis Ⅱ hloov ob qho tib si mus txog tus nqi nqis tes ua (0.07 MPa), pub twj tso kua mis turbine tripped; 11: 07: 11 stator txias dej ntws qis tiv thaiv tau mus txog qhov kev nqis tes ua, vim tias muaj kev tiv thaiv ntawm 30 s ncua, kev tiv thaiv tsis ua rau lub tsev tripping logic (stator txias dej txias rau phaj kub exchanger).
03 Ua rau kev tsom xam
Los ntawm daim duab 1, nws tuaj yeem pom tias cov cua sov hauv cov roj lubricating tau tso rau hauv qhov kaw dej txias los ntawm lub phaj kub exchanger. Phaj heat exchanger core element heat transfer phaj yog ua los ntawm stainless hlau, thickness ntawm li 0.5 hli. Feem ntau nrog cov pwm yuav raug nias rau hauv ntau qhov chaw lossis corrugated phaj (kab rov tav ncaj corrugated, herringbone corrugated, kab pheeb ces kaum corrugated, thiab lwm yam), tsis yog tsuas yog ua kom lub rigidity ntawm lub phaj, tab sis kuj los tiv thaiv lub corrugated phaj deformation ntawm lub phaj. siab, txhim khu lub degree ntawm turbulence ntawm cov kua thiab qhov chaw ntawm tshav kub hloov lwm lub tsev, thiab nyob rau tib lub sij hawm tiv taus qhov sib txawv ntawm lub siab ntawm ob sab. Yog li ntawd, daim ntawv phaj phaj qauv yog los xyuas kom meej tias cov phaj kub exchanger npaum cov cua sov hloov fittings. Vim lub phaj kub exchanger phaj yog nyias, thaum lub tshav kub exchanger ntawm ob sab ntawm lub siab sib txawv hloov, yuav cuam tshuam cov duab ntawm lub phaj, lub tshav kub exchanger ntawm ob sab ntawm lub ntim yuav ua raws li los ntawm ib tug me ntsis kev hloov nyob rau hauv no feature. yog ib qho yooj yim yuav tsis quav ntsej.
Nyob rau hauv tus txheej txheem ntawm kev hloov pauv sai ntawm cov dej txias kaw, lub phaj txias txias cua sov phaj phaj yog cuam tshuam los ntawm qhov sib txawv ntawm qhov sib txawv ntawm ob sab ntawm micro-deformation tshwm sim, sab dej ntawm qhov chaw tau cog lus sai, cov roj sab ntawm qhov chaw nthuav dav, cov roj lubricating hauv lub kaw lus nthuav dav thiab ua kom muaj qhov chaw ntxiv ntawm cov roj ntawm cov khoom siv hluav taws xob, uas ua rau muaj kev hloov pauv sai ntawm cov roj lubricating siab ntawm cov twj tso kua mis pub rau tsawg dua 0.07 MPa, uas ncav cuag tus nqi ntawm qhov kev txiav txim ntawm cov roj lubricant siab qis Ⅱ hloov, thiab 2 lub twj tso kua mis turbines tau ua tiav Lub ob lub twj tso kua mis turbines tripped ib tom qab.
Tom qab lub tsev tsis tau mus txog, txhawm rau txheeb xyuas qhov kev sib raug zoo ntawm qhov kev hloov pauv ntawm lub kaw lus kaw dej txias thiab lub tshuab lubricant siab ntawm cov twj tso kua mis pub, lub kaw dej txias twj tso kua mis hloov pauv tau rov ua dua, thiab cov roj nplua nyeem siab ntsuas ntawm ob lub twj tso kua mis turbines tau saib xyuas hauv qhov chaw. Pib No. 2 kaw dej txias twj tso kua mis, pib ib txwm, nres No. 1 kaw dej txias twj tso kua mis, pub twj tso kua mis turbine lubricating roj siab instantaneous sai poob nyob rau hauv kaw txias dej siab nyob rau hauv 3 s ntawm 0.81 MPa rau {{ 6}}.65 MPa, No. 2 pub twj tso kua mis turbine lubricating roj siab yog tsawg Ⅰ hloov kev txiav txim, thiab lub stator txias dej system txaus tus nqi muaj feem xyuam rau.
04 Kev ntsuas kev kho mob
a. Nyob rau hauv kev tiv thaiv logic ntawm pub twj turbine lubricating roj siab tsawg Ⅰ pib standby lubricating roj twj tso kua mis, ntxiv ncua sij hawm 3 s tej yam kev mob, roj siab instantaneous fluctuation<3 s, standby oil pump is too late to start, in order to ensure that the turbine does not burn tile accident, usually lubricating oil pressure low Ⅱ value in the accident lubricating oil pump at the same time to trigger the feed pump turbine tripping protection. In order to avoid false tripping caused by lubricant pressure fluctuation of feed pump turbine, the 3 s delay condition of standby pump can be cancelled, but it is required that the oil pressure is low Ⅰ switch action is safe and reliable, otherwise it is easy to cause the standby oil pump to start frequently. Lubricating oil pressure low Ⅱ trigger feed pump turbine trip protection, can increase 0.5 ~ 1 s delay, but increased the risk of shaft tile burn.
b. Vim lub phaj kub exchanger micro-deformation tshwm sim los ntawm tsis tshua muaj lubricant siab, tsuas yog instant fluctuations, lub kaw lus roj siab yuav rov qab tau nyob rau hauv ib tug luv luv lub sij hawm, yog li ntawd, nyob rau hauv lub lubricating roj system roj muab pipeline (tshwj xeeb tshaj yog nyob rau hauv lub siab raj nyob ze ntawm lub point. ntawm kev noj roj) rau nruab ib lub accumulator, nyob rau hauv lub lubricating roj siab rau ib tug luv luv lub sij hawm ntawm lub sij hawm thaum lub lubricating roj siab yog txo, lub accumulator khaws cia nyob rau hauv lub tso tawm ntawm lubricating roj, los them rau lub system siab, muaj peev xwm txo qhov cuam tshuam. ntawm instant fluctuations ntawm lubricating roj siab ntawm lub system.
05 Technical Summary
Tam sim no phaj kub exchanger yog dav siv nyob rau hauv lub tshiab installation chav tsev, nyob rau hauv lub tiag tiag daim ntawv thov ntawm lub tshav kub exchanger phaj micro-deformation yam ntxwv feem ntau tsis quav ntsej, thiab cov yam ntxwv ntawm lub system muaj kev ruaj ntseg thiab ruaj khov ua hauj lwm ntawm lub hav zoov ntawm ib tug ntau dua kev pheej hmoo. Yog li ntawd, nyob rau hauv kev siv cov phaj kub exchanger system, tshwj xeeb tshaj yog cov tseem ceeb roj system, nyob rau hauv lub tsim yuav tsum tau them tshwj xeeb mloog mus rau qhov teeb meem, nws yog pom zoo kom ntxiv ib tug txaus muaj peev xwm ntawm lub accumulator.
