Izingxenye Zokushintsha Ukushisa: Idizayini Yokusakaza, Ukukhetha Ingxubevange kanye Namathiphu Okulawula Ukugqwala 

Izingxenye zokushintsha ukushisa zisebenza ngaphansi kwezinga lokushisa elishintshashintshayo lesikhathi eside, ingcindezi eguquguqukayo kanye nezimo eziqhubekayo zokuxhumana ezimaphakathi, lapho iphutha elilodwa ledizayini, ukukhetha okungalungile kwempahla noma iphutha lokusakaza kungaholela ekuvaleni okungalindelekile, ukuvuza okuphakathi kanye nesikhathi sokuphumula sesistimu esibizayo. Ngokungafani nezingxenye zomkhumbi ezicindezelayo ezivamile, izingxenye zokushintshanisa ukushisa okuphonsiwe kufanele zilinganise amandla esakhiwo, ukulinganisa kwendlela yokugeleza kanye nokumelana nokugqwala kwesikhathi eside ngesikhathi esifanayo. Konjiniyela bezinqubo, onjiniyela bemishini kanye nabahloli bezobuchwepheshe bokuthengwa kwempahla ezimbonini zamakhemikhali, ze-petrochemical, ezemithi nezokudla, izinqumo zokuklama ezingenangqondo ngokuvamile zikhiqiza izingozi ezifihliwe ezingakwazi ukukhonjwa ngokugcwele ngisho nangemva kokuhlolwa kwengcindezi evamile. Lo mhlahlandlela uhlanganisa ngokuhlelekile imithetho yesakhiwo esijwayelekile, ukukhethwa kwe-alloy ukumelana nokubola ngokwemaphakathi, ukuthuthukiswa kwesistimu yokugenca, izidingo zokwelashwa kokushisa, ukuhlolwa kokuqina namathiphu okulawula ukugqwala asebenzayo, ukukusiza ugweme ukwehluleka okuvamile ekukhiqizeni ingxenye yesishintshi sokushisa ngokwezifiso.

1. Kungani Umklamo Wokusakaza Ubalulekile Ezingxenyeni Zokushintsha Ukushisa Kwezimboni

Amathimba amadizayini amaningi ekuqaleni aphatha izingxenye zokushintsha ukushisa njengezingxenye ezilula zemishini futhi akopishe umqondo wengxenye yokucindezela okujwayelekile ngokuqondile, okuvame ukuholela ezinkingeni ezinkulu ekusebenzeni kamuva. Izingxenye zesishintshi sokushisa njengamashidi amashubhu, imibhobho yokungena/yokukhipha kanye namagobolondo ahlukanisiwe akuzona nje izisekelo zesakhiwo; ziphinde zibe umngcele wengcindezi othintana ngqo nenqubo yenqubo. Idizayini yokusakaza engalungile ingase yethule ukushwabana okufihlekile, ukushuba kodonga olungalingani kanye nokucindezeleka okuyinsalela okungenakususwa, okungenakuqedwa ngokuphelele ngisho nangomshini ogcwele olandelayo.

Uma kuqhathaniswa nezingxenye ezisebenza ngomshini ngokugcwele ezisikwe kuma-forging aqinile, izingxenye zokushintshanisa ukushisa eziklanywe kahle zingakha izakhiwo eziyinkimbinkimbi zokusabalalisa ukugeleza kwe-net-shape ngesinyathelo esisodwa sokuthulula, kunciphisa kakhulu umthamo womshini, imfucuza yezinto ezibonakalayo kanye nezindleko zokukhiqiza zizonke. Kodwa le nzuzo isebenza kuphela lapho umklamo wokukhipha ngokwayo ucabangela ngokugcwele izidingo ezithile zemishini yokushintshanisa ukushisa. Izimo ezivamile zokwehluleka njengokuqhekeka kokugqwala kwengcindezi yendawo lapho kuhlangana khona umlomo wombhobho, ukuvaleka kwendlela yokugeleza okubangelwa isihlabathi esisalelayo esisalelayo, nokuvuza emseleni wokuvala weshidi leshubhu, ikakhulukazi kusekelwe ezinqumweni zokuklama ezingenangqondo ezenziwe ekuqaleni, kunokuba amaphutha omshini kamuva.

2. Izakhiwo Zokusakaza Ezivamile Nemithetho Yedizayini Yezingxenye Zokushintsha Ukushisa

Izingxenye ezisetshenziswa kakhulu zokushintsha ukushisa kwe-cast kumaphrojekthi ezimboni zihlanganisa ama-tube sheet castings, ama-nozzle flange, amakhava okugcina okushintshanisa ukushisa, amagobolondo ahlukanisiwe okugeleza kanye namabhulokhi oxhumano lwenguquko. Ngayinye yalezi zakhiwo ezijwayelekile inomklamo wayo wokulingisa obalulekile othinta ngokuqondile ukuthembeka kwengxenye yokugcina.

Ngokusakazwa kweshidi lamashubhu, umthetho obaluleke kakhulu ukugcina ukujiya kodonga kuyo yonke indawo yamapuleti. Izingxenye eziwugqinsi ngokungazelelwe ezikhundleni zomphathi webhawodi zizodala kalula izindawo ezishisayo ezihlukanisiwe ngesikhathi sokuqina, okuholela ekushwabaneni kwangaphakathi okungeke kubonwe ngisho nokuhlolwa kwe-UT okujwayelekile kwezinye izimo. Wonke amakhona acijile ekuhlanganiseni phakathi kweshidi leshubhu kanye ne-peripheral flange kufanele aklanywe nge-radius eyanele yokuguquka, ukugwema izindawo zokugxilisa ingqondo eziba imithombo yokuqalisa yokuqhekeka kokukhathala ngaphansi kokuhamba ngebhayisikili okuphindaphindiwe.

Kumagobolondo okusabalalisa ukugeleza kanye nokusakaza kwekhava yokugcina, indlela yokugeleza kwangaphakathi kufanele yakhelwe ukugwema amakhona afile ajulile angakwazi ukuhlanzwa ngemva kokusakaza. Isihlabathi esilahlayo esiyinsalela esingasuseki kanye nezingcezu zegobolondo le-ceramic ezishiywe ngaphakathi kwendlela yokugeleza zizothwalwa kunqwaba yeshubhu yokushintshisana ngokushisa ngesikhathi sokusebenza, okubangele ukuvinjelwa kokugeleza kanye nokugqwala okusheshisa ukuguguleka kwendawo. Ubukhulu obuncane obunconywayo bodonga lokujiya kwesakhiwo sokushintshanisa ukushisa abukho ngaphansi kuka-6mm ezingxenyeni zensimbi engagqwali, futhi abukho ngaphansi kuka-8mm ezingxenyeni zokucindezela kwensimbi yensimbi yengxenye enkulu. Zonke izindawo zokuvala ezibucayi kufanele zigcine imvume yomshini eyanele, ukuze kuqinisekiswe ukuthi indawo yokugcina eqediwe ayivezi noma yimaphi amaphutha e-casting porosity.

3. Ukukhethwa Kwengxubevange Engagqwali Ngenqubo Ephakathi

Ukukhetha okubalulekile kwezingxenye zokushintsha ukushisa akukwazi ukuthembela kuphela ezincwadini zezinto ezibonakalayo ezijwayelekile; kufanele ihambisane nendawo yokusebenza yangempela, izinga lokushisa, ukugxila kanye nezinga lokungcola kwephrojekthi ethile. Ukukhetha ingxubevange engalungile kungabangela ukugqwala ngaphambi kwesikhathi esikhathini esifushane kakhulu sesevisi, noma kuholele ekutshaleni imali ngokweqile okungalethi nzuzo yangempela.

3.1 Izingxenye Zokusakaza Zensimbi Engagqwali zamanzi ajwayelekile kanye nemithombo yezindaba ebolayo

Insimbi engagqwali casting izingxenye yisigaba sezinto ezisetshenziswa kakhulu ezingxenyeni zokushintsha ukushisa emanzini ahlanzekile, isitimu, i-organic solvent kanye nezimo zamanzi ezimboni ezigqwalile. I-304 yensimbi engagqwali ifanele izinga lokushisa elivamile lamanzi ahlanzekile kanye nezinhlelo zokushintshanisa ukushisa okujwayelekile ezingagqwali, kodwa azinconyelwe izimo zesevisi lapho ukugxiliswa kwe-ion ye-chloride kudlula u-50ppm ngokusebenza okuqhubekayo kwesikhathi eside.

I-316L kanye ne-316LVM yensimbi engagqwali ephansi enekhabhoni ephansi ithuthukisa ukumelana nokugqwala kanye nokumelana nokugqwala kwe-intergranular, ikwenze kube inketho eyinhloko yezishintshisi zokushisa ezivamile zezimboni ezithinta imidiya yenqubo egqwala kancane. Ngaphansi kwezimo ezivamile zokugqwala, izingxenye zensimbi engagqwali ezingu-316L zingagcina ukusebenza okuzinzile kwesikhathi eside emazingeni okushisa okusebenza aqhubekayo afika cishe ku-300°C. Ngisho naku-316L, ukuchayeka isikhathi eside ekugxilweni kwe-chloride ephezulu ngaphezu kuka-200ppm ezingeni lokushisa eliphakeme kusazokwandisa kakhulu ingozi yokugqwala komgodi kanye nokuqhekeka kokugqwala kwengcindezi. Lo mngcele ocacile wohlelo lokusebenza kufanele uchazwe ngokucacile esigabeni sokuklama, esikhundleni sokumane unwebe insimbi engagqwali kuzo zonke izimo ezigqwalile.

3.2 Izinketho ezisekelwe ku-nickel kanye ne-alloy ephezulu ezimweni ezinzima zokugqwala

Lapho i-process medium iqukethe i-asidi eqinile, i-chloride egxilile kakhulu, isixazululo sikasawoti esishisa kakhulu noma ezinye izakhi ezigqwala kakhulu insimbi evamile engagqwali engakwazi ukumelana nayo, ama-alloys asekelwe ku-nickel, izinsimbi ezingenasici eziyi-duplex nezinye izingxenye ezimelana nokugqwala kwe-alloy ephezulu ziba yisixazululo esidingekayo. Lezi zinto zigcina ukumelana nokugqwala okuzinzile ezindaweni ezinokhahlo lapho insimbi engenasici ye-austenitic evamile izohluleka ngokushesha.

Izimo ezijwayelekile zohlelo lokusebenza zihlanganisa izishintshisi zokushisa ezinhlelweni zokuhlanjululwa kwe-sulfuric acid egxilile, amasistimu okuthola amanzi okushisa aphezulu kanye namayunithi okushintshanisa ukushisa kwenqubo yamakhemikhali aphatha imidiya ephilayo ebolayo. Nakuba impahla yokuqala kanye nezindleko zokusakaza zezingxenye zokushintsha ukushisa kwe-alloy ephezulu ziphakeme kakhulu kunensimbi engagqwali evamile, impilo yazo yesevisi ende kakhulu ngokuvamile yehlisa isamba sezindleko zomjikelezo wempilo ngokuphawulekayo, uma kuqhathaniswa nokushintshwa okuvamile kwezingxenye zensimbi engagqwali ezihlulekile.

4. I-Gating System Design, Ukwelashwa Kokushisa kanye Nokuhlolwa Kokuqina

Ngisho nokukhetha okulungile kwezinto kanye nedizayini yesakhiwo enengqondo, inqubo yokulingisa engalungile isengakwazi ukushintsha umdwebo ofanelekayo wenze ingxenye yesishintshi sokushisa enesici. Idizayini yesistimu yokufaka yokusakazwa kokushintshisana ngokushisa kufanele iqinisekise ukuthi indawo ebalulekile ethwala ukucindezela iqina ngokulandelana ukusuka ekugcineni okukude kuya esikhuphukeni, ukugwema ukudala amachibi oketshezi angawodwa akha ukushwabana okufihliwe ngaphakathi kwengxenye. Ngokusakazwa kweshidi lamashubhu esigaba esiwugqinsi, usayizi ofanelekile wesikhuphukeli kanye nezinyathelo zokupholisa ngokuvamile kuyadingeka ukuze kuqinisekiswe ukuzwakala kwangaphakathi.

Ukwelashwa kokushisa ngesinye isinyathelo esingaxoxiswana ngaso sezingxenye zesishintshi sokushisa. Ukufakwa kwensimbi engagqwali kufanele kudlule ekwelashweni kwesisombululo esigcwele ngemva kokuthelwa, ukuze kuqedwe imvula ye-chromium carbide emingceleni yokusanhlamvu futhi kubuyisele ukumelana nokugqwala okugcwele kwe-intergranular. Ngokusakazwa kwamagobolondo okushintshanisa ukushisa okuyinkimbinkimbi, ukwelashwa okunikelwe kokukhulula ukucindezeleka ngemva komshini onzima kuyanconywa kakhulu, ukususa ingcindezi enkulu eyinsalela enqwabelene ngesikhathi sokuphonsa nokupholisa. Ngaphandle kokukhululeka kokucindezeleka okufanele, ingxenye ingase ikhubazeke kakhulu ngemva ukuqeda imishini, noma udale ukuqhekeka okungalindelekile ngemuva kokufakwa emsebenzini.

Ukuhlolwa kokuqina kuyisithiyo sokugcina esibalulekile ngaphambi kokuthi ingxenye yesishintshi sokushisa ihambe efekthri. Ukusakaza okujwayelekile kokushintshisana kokushisa kwemboni ngokuvamile kuyadingeka ukwenza ukuhlolwa kwe-hydraulic izikhathi ezingu-1.5 ingcindezi yedizayini, bese kwenziwa ukuhlolwa kokuqina komoya ngaphansi kwengcindezi yokuklama ngendlela efanelekile yokuthola ukuvuza. Ezingxenyeni zokushintshanisa ukushisa ezisetshenziswa endaweni enobuthi, evutha umlilo noma ekwazi ukungena ngaphakathi, ukuhlolwa kokuvuza kwe-helium okwengeziwe kuvame ukudingeka ukuze kuqinisekiswe ukuthi ayikho indlela yokuvuza encane engakwazi ukutholwa ngokuhlolwa okujwayelekile kwe-hydraulic.

5. Izingxenye ze-Stainless Steel vs Nickel Alloy Heat Exchanger: Ukuqhathanisa Okungokoqobo

Amaqembu amaningi onjiniyela abhekene nephuzu lesinqumo elivamile: ukuthi akhethe izingxenye zokuphonsa insimbi engagqwali noma athuthukele ezingxenyeni zokushintsha ukushisa kwe-nickel alloy zephrojekthi ethile. Lesi sinqumo akufanele senziwe kuphela ngokubheka intengo yokuqala, kodwa futhi kucatshangelwe izilinganiso ezine eziyinhloko: izindleko zempahla, ubunzima bokukhiqiza, impilo yokugqwala okulindelekile kanye nomjikelezo wokunakekelwa okuphelele.

Kumaphrojekthi anesabelomali esinqunyelwe kanye nezimo ezimaphakathi, izingxenye ezifanelekayo zensimbi engagqwali ezinokucutshungulwa okufanele zingase zithole ukusebenza okuthembeke kakhulu. Kodwa ezimeni ezinzima zokugqwala lapho insimbi engagqwali ingakwazi ukuhlangabezana nempilo yokuklama edingekayo, ukukhetha ngobumpumputhe insimbi engagqwali ukonga izindleko zokuqala ngokuvamile kuzoholela ezindlekweni eziphakeme kakhulu ezibangelwa ukuvala shaqa okungahleliwe, ukuvuza kwengozi kanye nokushintshwa kwengxenye njalo. Kulezi zimo, ukuthuthukisa ku izingxenye ze-nickel alloy ukumelana nokugqwala ukukhetha okunengqondo kakhulu ngokwezobuchwepheshe nangokwezomnotho.

6. Amathiphu Avamile Okulawula Ukugqwala Esigabeni Sokukhiqiza

Izinkinga eziningi zokugqwala ezigwemekayo zezingxenye zokushintsha ukushisa azibangelwa ukukhetha okungalungile kwebanga lempahla, kodwa ukuphatha okungafanele esigabeni sokukhiqiza. Ithiphu lokuqala elisebenzayo ukususa ngokuphelele yonke insalela yesihlabathi sokuphonsa, i-ceramic shell material kanye nesikali se-oxide kuzo zombili izindawo ezingaphakathi nezingaphandle ngemva kokubhidliza. Noma iyiphi insalela ye-silicate esele endaweni yensimbi izophula ifilimu ye-passive endaweni futhi ibe isiqalo sokugqwala kwe-pitting okusheshisa ukusebenza.

Ithiphu lesibili elibalulekile ukususa yonke imiphetho ecijile, izimpawu zamathuluzi kanye nemikhondo yokugxilisa ingcindezi esele ngemuva komshini. Ngisho nokuklwebheka okuncane okucijile endaweni evalekayo noma odongeni lwendlela yokugeleza kungase kube indawo yokuqala ukugqwala kwengcindezi ngaphansi kwesenzo esihlanganisiwe sokucindezelwa okuqinile kanye nendawo edlayo. Ithiphu lesithathu ukwenza ukwelashwa okufanele kwe-passivation ezingxenyeni zokushintsha ukushisa zensimbi engagqwali ngemva komshini wokugcina. Ukwamukela umoya okungalungile okugxilile okungalungile, isikhathi sokuthintana esinganele noma ukuhlanzwa okungaphelele kwangemva kokwelashwa ngeke kuthuthukise ukumelana nokugqwala, futhi kungase kushiye ngisho namakhemikhali abangela ukugqwala ayinsalela endaweni asheshisa ukuhluleka kokugqwala kamuva.

7. Imibuzo Evame Ukubuzwa

• Q1: Yibuphi ubukhulu obuncane bodonga olungafinyelelwa ngokuzinzile kuzakhiwo zendlela yokugeleza yesishintshi sokushisa?
  A: Ezingxenyeni zokuphonsa zensimbi engagqwali, ubuncane bokujiya bodonga obuzinzile bezakhiwo zendlela yokushintshashintsha ukushisa ngokuvamile buba ngu-6mm. Ezingxenyeni ezincane kakhulu zesishintshi sokushisa ngokwezifiso, ukujiya kodonga kuze kufike ku-4mm kungafinyelelwa ngemva kokuthuthukiswa kwenqubo ehlosiwe, kodwa lokhu kufanele kuqinisekiswe ekuqaleni kwesigaba sokuklama ukuze kugwenywe izidingo ezingenangqondo.
• Q2: Ingabe zonke izingxenye zokushintshanisa ukushisa zidinga u-100% wokuhlolwa okugcwele kwe-radiographic?
  A: Hhayi bonke. Ububanzi nengxenye yokuhlola okungabhubhisi kufanele kunqunywe ngokwezinga lokucindezela, ubungozi obuphakathi nendawo kanye nokucaciswa kwephrojekthi efanele. Okungenabo ubuthi okuvamile, okuphakathi nendawo engashi ekucindezelweni okuphansi kuya kwamaphakathi, ukuhlolwa kwesampula okusekelwe ezigabeni ezibucayi ngokuvamile kuyamukeleka. Kodwa ezingxenyeni zokushintshanisa ukushisa ezibamba i-medium eyingozi kakhulu, ukuhlolwa okugcwele kwe-volumetric yawo wonke ama-welds ane-pressure-bearing and casting areas kuyadingeka.
• Q3: Ingabe ukusakaza kwe-heater kungalungiswa ngokushisela ngemva kokuthola amaphutha amancane e-porosity ebusweni?
  IMPENDULO: Yebo, kodwa inqubo yokulungisa i-welding kufanele igunyazwe ngokuya ngemishini yokucindezela ehambisanayo, futhi ukwelashwa okugcwele kokushisa kwangemva kokushisela kanye nokuhlolwa kokuqina okuphindaphindiwe kufanele kuqedwe ngemva kokulungiswa. Ukulungiswa kwe-welding okungahleliwe okungalawulwa ngaphandle kwenqubo efanele kuzokwethula ukucindezeleka okusha kwensalela kanye nokukhubazeka okufihliwe okuyingozi kakhulu kune-porosity encane yasekuqaleni.

8. Isifinyezo Sokugcina

Ukuthembeka kwezingxenye zokushintshanisa ukushisa akunqunywa isinyathelo esisodwa, kodwa umphumela ohlangene womklamo wesakhiwo sokusakaza esiphusile, ukukhethwa kwengxubevange ekwazi ukumelana nokugqwala okumaphakathi, idizayini yesistimu yokugenca ethuthukisiwe, ukwelashwa okufanele kokushisa kanye nokuhlola okuqinile kokuqina. Izingxenye zokuphonsa zensimbi engagqwali ziwukukhetha okusebenziseka kalula futhi okungabizi kakhulu kuzimo eziningi zezimboni zokugqwala okuphakathi nendawo, kuyilapho izingxenye zokushintsha ukushisa ezisekelwe ku-nickel zinikeza ukuphepha okudingekayo kwesikhathi eside ezimweni zokusebenza ezibi kakhulu insimbi engagqwali engakwazi ukuzisingatha.

Ngokunaka ukufana kokuqina kodonga, ukugwema isihlabathi sokuphonsa esiyinsalela esingasuseki, ukuqeda amaphuzu okugxilisa ingqondo abukhali kanye nokwenza ukwelashwa okufanele kwangemva kokusakazwa kwesikhashana esigabeni sokukhiqiza, ungagwema ngempumelelo ukwehluleka ukugqwala okuvamile kwangaphambi kwesikhathi. Ngoba amaphrojekthi wokukhipha isishintshi sokushisa ngokwezifiso, ukwenza izinqumo ezisekelwe ekuthembekeni komjikelezo wempilo ogcwele esikhundleni sentengo yokuthenga yokuqala kuphela kuyindlela ephumelela kakhulu yokunciphisa isikhathi sokuphumula esingalindelekile kanye nezindleko zokunakekela ekusebenzeni kwezimboni zesikhathi eside.