Gawo la KDON-32000/19000 lolekanitsa mpweya ndiye gawo lalikulu lothandizira uinjiniya wa 200,000 t/a ethylene glycol. Iwo makamaka amapereka yaiwisi yaiwisi wa wahidrojeni ku pressurized gasification unit, ethylene glycol synthesis unit, sulfure kuchira, ndi kuchimbudzi mankhwala, ndipo amapereka mkulu ndi otsika kuthamanga nayitrogeni kwa mayunitsi osiyanasiyana a pulojekiti ethylene glycol poyambira kuyeretsa ndi kusindikiza, komanso amapereka unit mpweya ndi zida mpweya.
A. NTCHITO ZA NTCHITO
KDON32000/19000 zida zolekanitsa mpweya zidapangidwa ndikupangidwa ndi Newdraft, ndipo zimatengera njira yoyendetsera kuyeretsedwa kwa ma cell adsorption, air booster turbine expansion refrigeration, compression yamkati ya okosijeni, kupsinjika kwakunja kwa nayitrogeni, komanso kufalikira kwa mpweya. Chinsanja cham'munsichi chimagwiritsa ntchito nsanja ya sieve yopangidwa bwino kwambiri, ndipo nsanja yapamwamba imatengera kulongedza mokhazikika komanso kupanga distillation yopanda argon ya hydrogen.
Mpweya wosaphika umayamwa kuchokera munjira, ndipo fumbi ndi zonyansa zina zamakina zimachotsedwa ndi fyuluta yodziyeretsa yokha. Mpweya pambuyo pa fyulutayo umalowa mu compressor ya centrifugal, ndipo itatha kuponderezedwa ndi compressor, imalowa munsanja yoziziritsira mpweya. Pozizira, imatha kuyeretsanso zonyansa zomwe zimasungunuka mosavuta m'madzi. Mpweya ukachoka pa nsanja yozizirira umalowa mu cell sieve purifier kuti usinthe. Mpweya woipa wa carbon dioxide, acetylene ndi chinyezi mumlengalenga ndi adsorbed. Makina oyeretsa a molekyulu amagwiritsidwa ntchito m'njira ziwiri zosinthira, imodzi yomwe ikugwira ntchito pomwe inayo ikupanganso. Kuzungulira kogwira ntchito kwa oyeretsa kumakhala pafupifupi maola 8, ndipo choyeretsera chimodzi chimasinthidwa kamodzi pa maola 4 aliwonse, ndipo kusinthako kumayendetsedwa ndi pulogalamu yosinthika.
Mpweya pambuyo pa maselo sieve adsorber lagawidwa mitsinje itatu: mtsinje umodzi mwachindunji yotengedwa maselo sieve adsorber monga chida mpweya kwa zipangizo mpweya kulekana, mtsinje wina amalowa otsika-anzanu mbale-zipsepse kutentha exchanger, utakhazikika ndi reflux zoipitsidwa ammonia ndi ammonia, ndiyeno amalowa mu mtsinje umodzi mtsinje, amapita ku mtsinje wapansi, amapita ku mtsinje wa mtsinje, amapita ku mtsinje waung'ono. tsinde loyamba la chilimbikitso. Mtsinje wina mwachindunji yotengedwa ndi ntchito monga dongosolo chida mpweya ndi chipangizo mpweya pambuyo kuchepetsedwa kupanikizika, ndi mtsinje wina akupitiriza kupanikizika mu chilimbikitso ndipo anawagawa mu mitsinje iwiri pambuyo wothinikizidwa mu gawo lachiwiri. Mtsinje umodzi umachotsedwa ndi kuziziritsa kutentha kwa chipinda ndipo umapita kumapeto kwa turbine expander kuti upitirire kupanikizika, kenako umachotsedwa kudzera muzitsulo zotentha kwambiri ndikulowa mu chowonjezera kuti chiwonjezeke ndi ntchito. Mpweya wowonjezera wonyezimira umalowa mu cholekanitsa chamadzimadzi cha gasi, ndipo mpweya wolekanitsidwa umalowa munsanja yapansi. The madzi mpweya yotengedwa olekanitsa mpweya-zamadzimadzi akulowa m'munsi nsanja monga madzi mpweya reflux madzi, ndi mtsinje ena akupitiriza kukakamizidwa mu chilimbikitso kwa tsinde lomaliza psinjika, ndiyeno utakhazikika kwa firiji ndi ozizira ndi kulowa mkulu-anzanu mbale-zipsepse kutentha exchanger kwa kutentha kuwombola ndi madzi mpweya ndi reflux zoipitsidwa nayitrogeni. Mbali imeneyi ya mpweya wothamanga kwambiri imalowetsedwa mu mpweya wamadzimadzi utachotsedwa pansi pa chotenthetsera kutentha, umalowa munsanja yapansi pambuyo pogwedeza. Mpweya ukangosungunuka munsanja yotsika, mpweya wamadzi wowonda, mpweya wamadzimadzi wokhala ndi okosijeni, nayitrogeni wamadzimadzi komanso ammonia wamadzimadzi amapezeka. Mpweya wamadzi wowonda, mpweya wamadzimadzi wokhala ndi okosijeni wambiri komanso nayitrogeni wamadzimadzi wamadzimadzi amazizira kwambiri ndipo amalowetsedwa munsanja yakumtunda kuti asungunukenso. The madzi mpweya analandira pansi pa nsanja chapamwamba ndi wothinikizidwa ndi madzi mpweya mpope ndiyeno akulowa mkulu-anzanu mbale-zipsepse kutentha exchanger kwa reheating, ndiyeno akulowa mpweya payipi maukonde. Nayitrogeni wamadzimadzi omwe amapezeka pamwamba pa nsanja yotsika amachotsedwa ndikulowa mu tanki yosungiramo madzi ammonia. Ammonia yoyera kwambiri yomwe imapezeka pamwamba pa nsanja yotsika imatenthedwanso ndi chowotcha chotsitsa chotsika kwambiri ndikulowa mu network ya mapaipi a ammonia. Nayitrogeni yotsika kwambiri yomwe imapezeka kumtunda kwa nsanjayo imatenthedwanso ndi chotenthetsera chotenthetsera chotenthetsera, kenako ndikutuluka mubokosi lozizira, kenako ndikukanikizidwa mpaka 0.45MPa ndi nitrogen compressor ndikulowa mu netiweki ya mapaipi a ammonia. Kuchuluka kwa kagawo kakang'ono ka argon kumachotsedwa pakati pa nsanja yapamwamba ndikutumizidwa ku nsanja ya xenon. Gawo la xenon limasungunuka mu nsanja ya argon yosanja kuti ipeze argon yamadzimadzi, yomwe imatumizidwa pakati pa nsanja yoyengedwa ya argon. Pambuyo distillation mu woyengedwa argon nsanja, woyengeka madzi xenon anapezedwa pansi pa nsanja. Mpweya wonyansa wa ammonia umatengedwa kuchokera kumtunda kwa nsanja yapamwamba, ndipo pambuyo potenthedwa ndi ozizira, otsika otsika mbale-fin kutentha exchanger ndi high-pressure plate-fin heat exchanger ndi kutuluka m'bokosi lozizira, amagawidwa m'magawo awiri: gawo limodzi limalowa mu chowotcha cha nthunzi ya molecular sieve kuyeretsedwa kwa madzi monga regeneration ya molecular dirty gasive ndi gasi ya madzi. yozizira nsanja. Pamene madzi mpweya kubwerera dongosolo ayenera kuyamba, madzi okosijeni mu madzi mpweya mpweya thanki anazimitsa mu madzi mpweya vaporizer kudzera valavu yoyang'anira, ndiyeno kulowa mpweya payipi maukonde pambuyo kupeza otsika-anzanu mpweya; pamene madzi asafe dongosolo kubwerera ayenera kuyamba, madzi ammonia mu madzi asafe yosungirako thanki ndi anasintha mu madzi mpweya vaporizer kudzera valavu yoyang'anira, ndiyeno wothinikizidwa ndi ammonia kompresa kupeza mkulu-anzanu nayitrogeni ndi otsika-anzanu ammonia, ndiyeno kulowa nayitrogeni payipi maukonde.
B.NJIRA YOLAMULIRA
Malingana ndi kukula ndi machitidwe a zida zolekanitsa mpweya, dongosolo la DCS logawidwa logawidwa limatengedwa, kuphatikizapo kusankha kwa machitidwe a DCS apamwamba padziko lonse, owunikira ma valve pa intaneti ndi zina zoyezera ndi zowongolera. Kuwonjezera pa kutha kukwaniritsa ndondomeko yoyendetsera gawo lolekanitsa mpweya, imathanso kuika ma valve onse olamulira pamalo otetezeka pamene unit yatsekedwa pangozi, ndipo mapampu ogwirizana amalowa m'malo otetezera chitetezo kuti atsimikizire chitetezo cha gawo lolekanitsa mpweya. Magawo akuluakulu a turbine kompresa amagwiritsa ntchito makina owongolera a ITCC (turbine compressor unit integrated control system) kuti amalize kuwongolera maulendo othamanga kwambiri, kuwongolera kwadzidzidzi komanso ntchito zolimbana ndi ma surge, ndipo amatha kutumiza ma siginecha ku dongosolo lowongolera la DCS mwanjira ya waya wolimba ndi kulumikizana.
C.Main monitoring unit of air separation unit
Kusanthula chiyero cha mankhwala okosijeni ndi mpweya wa nayitrogeni kusiya otsika kuthamanga kutentha exchanger, kusanthula chiyero cha m'munsi nsanja madzi mpweya, kusanthula m'munsi nsanja koyera madzi asafe, kusanthula chiyero cha mpweya kuchoka nsanja chapamwamba, kusanthula chiyero cha mpweya kulowa subcooler, kusanthula chiyero cha madzi mpweya mu nsanja chapamwamba, kutentha pambuyo yaiwisi condenser reflux madzi mpweya mosalekeza valavu, kuthamanga dipaliter mpweya mlingo valavu. chizindikiro cha kutentha kwa mpweya wakuda wa nayitrogeni wosiya kutentha kwapamwamba kwambiri, kusanthula chiyero cha mpweya umalowa m'malo otsika kutentha, kutentha kwa mpweya kumasiya kutentha kwakukulu, kutentha ndi kusiyana kwa kutentha kwa mpweya wa ammonia wonyansa wosiya kutentha, kusanthula gasi kumtunda kwa nsanja ya xenon doko m'zigawo: zonsezi ndizo kusonkhanitsa deta panthawi yoyambira ndi kusintha kwa kayendedwe ka mpweya, komwe kumakhala kopindulitsa kwa kayendedwe ka mpweya ndi mpweya wabwino. zida zolekanitsa. Kusanthula kwa nitrous oxide ndi acetylene zomwe zili mu kuzizira kwakukulu, ndi kusanthula kwa chinyezi mu mpweya wowonjezera: pofuna kuteteza mpweya ndi chinyezi kulowa mu distillation system, kuchititsa kulimba ndi kutsekereza njira yosinthira kutentha, kukhudza malo osinthanitsa ndi kutentha, acetylene idzaphulika pambuyo pa kudzikundikira mu kuzizira kwakukulu kumaposa mtengo wina. Madzi a oxygen mpope shaft seal gasi, kusanthula kuthamanga, pampu yamadzimadzi ya oxygen yokhala ndi kutentha kwa chotenthetsera, kutentha kwa mpweya wamadzimadzi, kutentha kwa mpweya wamadzimadzi pambuyo pakukula, kuthamanga kwa mpweya wa expander seal, kutuluka, chizindikiro cha kusiyana, kuthamanga kwa mafuta, kutentha kwa thanki yamafuta ndi kutentha kwambuyo kwa mafuta, turbine expander yowonjezera mapeto, chiwongolero chakumapeto kwa mafuta, kugwedezeka kwa kutentha, kugwedezeka kwa kutentha, kugwedezeka ndi kugwedezeka. turbine expander ndi pampu ya okosijeni yamadzimadzi, ndipo pamapeto pake kuonetsetsa kuti magwiridwe antchito agawidwe a mpweya.
Kutentha kwa ma molekyulu, kusanthula kwamadzi, mpweya wa sieve (nayitrogeni wodetsedwa) wolowera ndi kutulutsa kutentha, chizindikiritso champhamvu, kutentha kwa sieve kusinthika kwa mpweya ndi kutuluka, chiwonetsero cha kukana kwa ma cell a sieve, chizindikiritso chosiyana, kutentha kwa mpweya, kutentha kwa mpweya, alamu yowunikira, chowotchera mpweya wotulutsa mpweya wa H20, kusanthula kwa mpweya wa CO2, kusanthula kutentha kwa mpweya, kusanthula kwa mpweya wa CO2. inlet low low tower ndi booster flow flow: kuwonetsetsa kuti kusintha kwabwino kwa ma molecular sieve adsorption system ndikuwonetsetsa kuti CO2 ndi H20 zomwe zili mumlengalenga zomwe zimalowa mubokosi lozizira zimakhala zotsika. Chizindikiro cha mpweya wa zida: kuwonetsetsa kuti mpweya wa zida zolekanitsa mpweya ndi mpweya wa zida zomwe zimaperekedwa ku netiweki yamapaipi zikufika pa 0.6MPa (G) kuti zitsimikizire kuti zopanga zikuyenda bwino.
D.Makhalidwe a gawo lolekanitsa mpweya
1. Makhalidwe a ndondomeko
Chifukwa cha kuthamanga kwa okosijeni wa pulojekiti ya ethylene glycol, zida zolekanitsa mpweya za KDON32000/19000 zimatenga kuzungulira kwa mpweya, kupanikizika kwamkati kwa mpweya wa okosijeni ndi njira yopondereza yakunja ya ammonia, ndiko kuti, chowonjezera mpweya + pampu ya okosijeni yamadzimadzi + chowonjezera chowonjezera chowonjezera chimaphatikizidwa ndi bungwe lololera la makina osinthira kutentha kwa mpweya kuti alowe m'malo mwa mpweya wa okosijeni. Zowopsa zachitetezo zomwe zimayambitsidwa ndi kugwiritsa ntchito ma compressor okosijeni mumayendedwe akunja amachepetsedwa. Nthawi yomweyo, kuchuluka kwa okosijeni wamadzimadzi wotengedwa ndi kuzirala kwakukulu kumatha kuwonetsetsa kuti kuthekera kwa hydrocarbon kudzikundikira mumadzi oziziritsa mpweya wabwino kumachepetsedwa kuonetsetsa kuti zida zolekanitsa mpweya zikuyenda bwino. Njira yoponderezedwa yamkati imakhala ndi ndalama zotsika mtengo komanso kasinthidwe koyenera.
2. Makhalidwe a zida zolekanitsa mpweya
Zosefera zodzitchinjiriza zodzitchinjiriza zili ndi makina owongolera okha, omwe amatha kubweza nthawi ndipo amatha kusintha pulogalamuyo molingana ndi kukula kwake. The precooling dongosolo utenga mkulu-mwachangu ndi otsika kukana mwachisawawa wazolongedza nsanja, ndi wogawa madzi utenga latsopano, kothandiza ndi wofalitsa patsogolo, amene osati kuonetsetsa kukhudzana zonse pakati pa madzi ndi mpweya, komanso amaonetsetsa kutentha kuwombola ntchito. Waya mesh demister imayikidwa pamwamba kuonetsetsa kuti mpweya wotuluka munsanja yozizirirayo sumanyamula madzi. Makina otsatsa a molecular sieve amatenga mozungulira mozungulira komanso kuyeretsa bedi la magawo awiri. Makina osinthira amatengera ukadaulo wowongolera ma switch opanda mphamvu, ndipo chotenthetsera chapadera cha nthunzi chimagwiritsidwa ntchito kuletsa nthunzi yotenthetsera kuti isadutse mbali yonyansa ya nayitrogeni panthawi yokonzanso.
Njira yonse ya distillation tower system imatengera kuwerengera kwapadziko lonse lapansi kwa ASPEN ndi HYSYS software. Nsanja ya m'munsiyi imatenga nsanja ya sieve yopangidwa bwino kwambiri ndipo nsanja yapamwamba imatenga nsanja yokhazikika kuti iwonetsetse kuchuluka kwa chipangizocho ndikuchepetsa kugwiritsa ntchito mphamvu.
E.Kukambitsirana za njira yotsitsa ndi kukweza magalimoto okhala ndi mpweya
1.Zomwe ziyenera kukwaniritsidwa musanayambe kulekanitsa mpweya:
Musanayambe, konzekerani ndi kulemba ndondomeko yoyambira, kuphatikizapo ndondomeko yoyambira ndi kuyendetsa ngozi mwadzidzidzi, ndi zina zotero. Ntchito zonse panthawi yoyambira ziyenera kuchitidwa pa malo.
Kuyeretsa, kutsuka ndi kuyesa ntchito yamafuta opaka mafuta kumalizidwa. Musanayambe kupopera mafuta odzola, gasi wosindikiza ayenera kuwonjezeredwa kuti asatayike. Choyamba, kusefera kodzizungulira kwa thanki yamafuta opaka mafuta kuyenera kuchitika. Ukhondo ukafika pamlingo wina, payipi yamafuta imalumikizidwa kuti isungunuke ndi kusefa, koma pepala losefera limawonjezedwa musanalowe mu kompresa ndi turbine ndipo amasinthidwa nthawi zonse kuti atsimikizire ukhondo wamafuta omwe amalowa mu zida. Kuthamangitsa ndi kutumiza kwa madzi ozungulira, njira yoyeretsera madzi, ndi njira yopopera yolekanitsa mpweya imatsirizidwa. Asanakhazikitse, payipi yolemetsa ya okosijeni yolekanitsa mpweya iyenera kuchotsedwa, kuziziritsa, ndikudutsa, kenako kudzazidwa ndi mpweya wotsekera. Mapaipi, makina, magetsi, ndi zida (kupatula zida zowunikira ndi zida zoyezera) zida zolekanitsa mpweya zidayikidwa ndikuyesedwa kuti zikhale zoyenerera.
Mapampu onse opangira madzi opangira madzi, mapampu a okosijeni amadzimadzi, ma compressor a mpweya, zowonjezera, zowonjezera ma turbine, ndi zina zotere zili ndi momwe zimayambira, ndipo zina ziyenera kuyesedwa kaye pamakina amodzi.
Makina osinthira masieve a mamolekyulu ali ndi zoyambira, ndipo pulogalamu yosinthira mamolekyulu yatsimikiziridwa kuti imatha kugwira ntchito moyenera. Kutenthetsa ndi kuyeretsa mapaipi a nthunzi yothamanga kwambiri kwatha. Chida choyimilira cha mpweya chakhala chikugwiritsidwa ntchito, kusunga mphamvu ya mpweya wa chida pamwamba pa 0.6MPa (G).
2.Kuyeretsa mapaipi olekanitsa mpweya
Yambitsani dongosolo lamafuta opaka mafuta ndi makina osindikizira a gasi wa turbine ya nthunzi, kompresa ya mpweya ndi mpope wamadzi ozizira. Musanayambe kompresa ya mpweya, tsegulani valavu yotulukira mpweya ya kompresa ya mpweya ndikusindikiza polowera mpweya wa nsanja yoziziritsira mpweya ndi mbale yakhungu. Pambuyo pochotsa chitoliro cha mpweya wa kompresa kutsukidwa, kuthamanga kwa mpweya kumafika pamagetsi otulutsa mpweya ndipo chiwongolero cha payipi chotsuka chimakhala choyenera, gwirizanitsani chitoliro cha mpweya wozizira, yambitsani mpweya wozizira (musanayambe kuyeretsa, kuyika kwa nsanja yoziziritsira mpweya sayenera kudzazidwa; mpweya wolowera mpweya wa molecular sieve adsorber adsorber inlet cholowera), dikirani mpaka chitolirocho chiyambe kutsekedwa, dikirani mpaka sipinachi iyambe. kuyeretsa dongosolo (asanayeretsedwe, maselo sieve adsorber adsorbent sayenera kudzazidwa; mpweya wolowera ozizira bokosi lolowera flange ayenera kulumikizidwa), kuyimitsa mpweya kompresa mpaka chandamale oyenerera, mudzaze mpweya kuzirala nsanja kulongedza ndi molecular sieve adsorber adsorbent, ndi kuyambitsanso fyuluta, nthunzi dongosolo makina opangira mpweya, airco system turbine, airco turbine, airco. kudzaza, osachepera milungu iwiri yogwira ntchito mwachizolowezi mutatha kubadwanso, kuzizira, kuwonjezereka kwamphamvu, kutsatsa, ndi kuchepetsa kupanikizika. Pambuyo pakutentha kwanthawi yayitali, mapaipi a mpweya wadongosolo pambuyo pa adsorber ya molecular sieve ndi mapaipi amkati a nsanja yogawa amatha kuwombedwa. Izi zikuphatikiza zosinthira kutentha kwambiri, zosinthira kutentha pang'ono, zowonjezera mpweya, zowonjezera ma turbine, ndi zida za nsanja zomwe zimalekanitsa mpweya. Samalani kuwongolera kayendedwe ka mpweya kulowa mu dongosolo loyeretsera ma molekyulu kuti mupewe kukana kwa molekyulu ya sieve yomwe imawononga wosanjikiza wa bedi. Pamaso kuwomba fractionation nsanja, mipope onse mpweya kulowa fractionation nsanja ozizira bokosi ayenera okonzeka ndi Zosefera osakhalitsa kupewa fumbi, kuwotcherera slag ndi zonyansa zina kulowa exchanger kutentha ndi zimakhudza zotsatira kutentha kuwombola. Yambitsani makina opaka mafuta ndi osindikizira musanayambe kuwomba chowonjezera cha turbine ndi mpope wa okosijeni wamadzimadzi. Malo onse osindikizira gasi a zida zolekanitsa mpweya, kuphatikiza mphuno ya chowonjezera cha turbine, ayenera kutsekedwa.
3. Kuziziritsa kopanda kanthu ndi kutumiza komaliza kwa gawo lolekanitsa mpweya
Mapaipi onse kunja kwa bokosi lozizira amawombedwa, ndipo mapaipi onse ndi zida zomwe zili mubokosi lozizira zimatenthedwa ndikuwulutsidwa kuti zikwaniritse kuzizirira ndikukonzekera kuyesa kozizira.
Kuzizira kwa distillation tower kukayamba, mpweya wotulutsidwa ndi air compressor sungathe kulowa mu distillation nsanja kwathunthu. Mpweya woponderezedwa wochuluka umatulutsidwa mumlengalenga kudzera mu valavu yotulukira mpweya, motero kumapangitsa kuti mpweya wa compressor usasinthe. Pamene kutentha kwa gawo lililonse la distillation nsanja kumachepa pang'onopang'ono, kuchuluka kwa mpweya wokokedwa kumawonjezeka pang'onopang'ono. Panthawi imeneyi, gawo la mpweya wa reflux mu nsanja ya distillation imatumizidwa ku nsanja yozizirira madzi. Kuzizira kuyenera kuchitidwa pang'onopang'ono komanso molingana, ndi kuzizira kwapakati pa 1 ~ 2 ℃/h kuonetsetsa kutentha kofanana kwa gawo lililonse. Panthawi yozizira, mphamvu yoziziritsa ya chowonjezera gasi iyenera kusungidwa pamlingo waukulu. Pamene mpweya kumapeto ozizira kwa kutentha kwakukulu kwa kutentha kuli pafupi ndi kutentha kwa liquefaction, siteji yozizira imatha.
Gawo lozizira la bokosi lozizira limasungidwa kwa nthawi, ndipo kutulutsa kosiyanasiyana ndi mbali zina zosamalizidwa zimafufuzidwa ndikukonzedwa. Kenako imitsani makinawo pang'onopang'ono, yambani kunyamula mchenga wa ngale mubokosi lozizira, yambani zida zolekanitsa mpweya pang'onopang'ono mukatsitsa, ndikulowanso malo ozizira. Zindikirani kuti pamene zida zolekanitsa mpweya zimayambika, mpweya wosinthika wa sieve ya molekyulu umagwiritsa ntchito mpweya woyeretsedwa ndi sieve ya maselo. Pamene zida zolekanitsa mpweya zimayambika ndipo pali mpweya wokwanira wokonzanso, njira yonyansa ya ammonia imagwiritsidwa ntchito. Panthawi yozizira, kutentha m'bokosi lozizira kumachepa pang'onopang'ono. Bokosi lozizira lodzaza ammonia liyenera kutsegulidwa munthawi yake kuti mupewe kupanikizika koyipa mubokosi lozizira. Kenako zida zomwe zili m'bokosi lozizira zimakhazikikanso, mpweya umayamba kusungunuka, madzi amayamba kuwonekera munsanja yapansi, ndipo njira ya distillation ya nsanja zapamwamba ndi zapansi zimayamba kukhazikitsidwa. Kenaka sinthani pang'onopang'ono ma valves limodzi ndi limodzi kuti kupatukana kwa mpweya kumayende bwino.
Ngati mukufuna kudziwa zambiri, chonde titumizireni kwaulere:
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Nthawi yotumiza: Apr-24-2025