Te Mārama ki ngā Mīhini Whakatōtō i roto i te Ahumahi Matū
Ko te whakatōtō tetahi o ngā mahi wāhanga tino nui i roto i te umanga matū. Mai i te purenga whakarewa i roto i te taiwhanga ki te wehenga o ngā wāhanga hinu i runga i te tauine whakahinuhinu, ko te whakatōtō te pou tuarā o ngā tukanga whakaputa maha. Ka wehea e ngā mīhini whakatōtō—ahakoa he wāhanga māmā, he pou whakatōtō nui rānei—ngā ranunga i runga i ngā rerekētanga o te piki me te heke (te ngāwari o te mimiti) o ō rātou wāhanga. Ka matapakihia e tēnei tuhinga ngā ariā taketake, ngā wāhanga matua, ngā momo whakatōtō, ngā tawhā whakahaere, tae atu ki ngā wero me ngā āhuatanga haumaru o te whakahaere i tētahi pūnaha whakatōtō.
Ngā Mātāpono Taketake o te Whakatōtō
Ko te tikanga, ka whakamahia e te whakahorohoro te meka he rerekē te ira kohua me te pēhanga mamaoa o ia matū. Ina whakamahanahia te ranunga, ka neke ngā wāhanga tino pūngāwerewere ki te āhua mamaoa. Kātahi ka whakamataohia tēnei mamaoa i roto i te pūwhakamātao kia hoki rā anō ki te wai (whakahorohoro). I taua wā, ko te wai e toe ana i roto i te oko whakamahana, i raro rānei o te pou, he nui ngā wāhanga he teitei ake te ira kohua.
Heoi, he mea nui kia mārama ko te whakamātao ehara i te mea ko te "whakamahana me te whakamatao" anake. Mō tētahi ranunga kua whakaritea, kei reira te taurite o te kohu-wai (VLE), e whakatau ana i te hanganga o te kohu me te wai i tētahi pāmahana me te pēhanga kua whakaritea. I roto i tētahi pou whakamātao, ka puta pinepine ngā tukanga mimiti me te whakatōtō i ngā wāhanga rerekē, ka hua ake he wehenga koi ake i te whakamātao kotahi.
Ngā Wāhanga Matua o te Mīhini/Wāhanga Whakatō
I roto i te ahumahi, ko te "mīhini whakahoromata" e pā ana ki tētahi kete taputapu e mahi ana hei pūnaha. Ko ōna wāhanga matua ko:
1. Whakarewa (whakamahana pou raro)
Ka tukuna e te kaiwhakarewa te wera hei mimiti i ētahi o te wai i raro i te pou. Ka piki te mamaoa e puta mai ana ki te tihi o te pou, ā, ka mahi hei "mīhini" mō te wehenga. Ko ngā momo kaiwhakarewa noa ko ngā kaiwhakarewa kettle, ngā kaiwhakarewa thermosiphon, me ngā kaiwhakarewa forced circulation.
2. Pou whakatōtō
Ko te pou te taputapu wehewehe matua. Kei roto he taputapu whakapā i waenganui i te kohu me te wai, he paepae (tātari/pereti) he tākai rānei. Ko te whāinga he waihanga i tētahi wāhi whakapā nui kia taurite haere ai te kohu me te wai.
3. Paepae, Tākai rānei
– He pai ngā paepae (hei tauira, ngā paepae tātari, ngā paepae takirere, ngā taupoki mirumiru) mō te whānuitanga o te mahi, ā, he ngāwari hoki te aroturuki, engari he nui ake te hekenga pēhanga.
– Ko te tākai (matapōkere, hanganga rānei) ka whiriwhiria i te nuinga o te wā mō te whakahorohoro korehau, mō ngā pūnaha rānei e pāngia ana e ngā hekenga pēhanga, nā te mea he iti ake te hekenga pēhanga.
4. Pūwhakamātao
Ka whakamatao te pūwhakamātao i te mamaoa mai i te tihi o te pou hei wai. Ka taea te whakamātao katoa (te whakamātao i te mamaoa katoa) te whakamātao wāhanga rānei (te whakaputa i te ranunga mamaoa-wai).
5. Pūnaha pūwero me te pūnaha pūwero
Ka kohia te wai whakapūkara mai i te pūwhakapūkara, kātahi ka rere ētahi ki te tihi o te pou hei reflux. He mea nui te reflux nā te mea ka whakapai ake i te parakore o te hua o runga mā te "horoi" i te mamaoa e piki ake ana ki te wai e heke iho ana.
6. Ngā papu, ngā paipa, ngā mana whakahaere taputapu
Ka whakawhirinaki ngā pūnaha whakatōtō ki te whakahaere i te tere rere, te pāmahana, te pēhanga, me te taumata wai. Ko te whakahaere pumau te mea e whakatau ana i te kounga o te hua me te whai huatanga o te pūngao.
Ngā momo whakatōtō i roto i te umanga matū
I whakawhanakehia ngā momo whakatōtō rerekē hei aro ki ngā āhuatanga rerekē o ngā ranunga:
1. Te whakahorohoro māmā
Ko te tikanga mō ngā rerekētanga nui o te pūmahana kohua, ngā wehenga taratara rānei. He maha ake ngā wā mō te tauine iti.
2. Te whakahorohoro haurua
Te whakamahi i ngā pou me ngā wāhanga wehewehe maha. Koinei te momo tino noa i roto i te ahumahi, hei tauira, te wehenga benzene-toluene, te wehewehenga warowaihā rānei.
3. Whakatōtō korehau
He pai te whakaheke i te pēhanga whakahaere hei whakaheke i te pūwāhi koropupū mō ngā matū he teitei ngā pūwāhi koropupū, mō ngā mea rānei e tere pirau ana i ngā pāmahana teitei. Hei tauira: ngā wāhanga hinu taumaha, te whakamahine i ētahi monomer.
4. Te whakamaroke i te mamaoa
Ka werowerohia te mamaoa wai hei āwhina i te mimiti i ngā wāhanga rauropi i ngā pāmahana iti iho. He whānuitia te whakamahinga i roto i ngā hinu kakara me ētahi tukanga whakaora whakarewa.
5. Te whakatōtōtanga azeotropic / te tangohanga
Mō ngā ranunga e hanga ana i ngā azeotropes (he rite te hanganga o te kohu ki te hanganga wai), he uaua te whakatutuki i te parakore teitei mā te whakamahi i te tikanga whakahorohoro. Ko te otinga: te tāpiri i tētahi entrainer (azeotrope) i tētahi whakarewa whiriwhiri rānei (tangohanga) hei whakarerekē i te āhua o te piki me te heke. He tauira matarohia: te purenga o te etanoru mai i te ranunga etanoru-wai.
Ngā Tawhā Whakahaere Hira
Kia pai ai te mahi a te mīhini whakahoro wai, ka arotahi ngā kaiwhakahaere me ngā kaihanga ki ētahi tawhā:
– Te pēhanga pou: Ka pā ki te pūwāhi koropupū me te VLE. Ka whakanui te pēhanga teitei i te pāmahana whakahaere; ka āwhina te pēhanga iti i ngā matū tairongo wera.
– Te ōwehenga o te reflux: Ka piki ake te parakore i te nuinga o te wā, engari ka piki ake hoki te whakapaunga pūngao.
– Te tere o te kohua / te mahi kohua anō: E whakatau ana i te nui o te mamaoa e piki ake ana; ki te iti rawa ka kore e pai te wehenga, ki te tiketike rawa ka puta he waipuke.
– Te maha o ngā wāhanga me te whai huatanga o te paepae/tākai: Mā te ariā o ngā wāhanga ariā ka āwhina i te hoahoa. Ka pāngia te whai huatanga tuturu e te waiora me ngā āhuatanga ā-tinana o te ranunga.
– Ngā āhuatanga whāngai (pāmahana, āhua, hanganga, tere): Ka pāngia te kōtaha pāmahana me te kawenga pou e ngā āhuatanga whāngai. He maha ngā wā ka whakamahia ngā whakamahana-mua, ngā pūwero uira rānei hei whakatikatika i te whāngai.
Ngā Mate Pokanga Noa
I roto i te mahi tūturu, ka pā pea ngā raruraru e whai ake nei ki ngā pou whakatō:
– Waipuke: He nui rawa te rere o te mamaoa, ā, he uaua ki te heke te wai; ka piki ake te hekenga o te pēhanga, ka whakaiti i te kounga o te hua.
– Te tangi/te ringihanga: He iti rawa te mamaoa, ā, ka mimiti te wai mā roto i te paepae; ka heke te pānga o te mamaoa ki te wai.
– Te pahuka: Ka whakanui te pahuka i te urunga (te nekehanga whakarunga o te wai), ka whakaiti i te parakore.
– Te whakaurunga: Ko ngā pata wai e haria ana e te kohu ki runga; ka taea te whakapoke i te hinu whakahoromata.
– Te paru/te unahi: Ka whakaitihia te whakawhiti wera i roto i te kohua hou/te whakamatao me te aukati i te tākai/te paepae.
Ko te whakatika i ēnei take ko te whakarerekē i te mahi whakahou i te kohua, te reflux, te pēhanga, te tiaki ā-wā rānei (te horoi me te tirotiro ā-roto).
Te Whai Hua o te Pūngao me te Whakaurunga Wera
E mōhiotia ana te whakamātao he tukanga e nui ana te kaha nā te nui o te whakamahana me te whakatōtō e hiahiatia ana. E whai ana te ahumahi hou ki te whakapiki i te whai huatanga mā te:
– Te whakaurunga wera: Te whakamahi i te wera mai i ētahi atu awa tukanga hei whakamahana i te whāngai.
– Te whakatōtō maha-pānga me te papu wera: Te whakamahi i te kōpeketanga mamaoa, te whakahaere pēhanga rānei hei "hangarua" i te wera o te hauhautanga.
– Arotautanga o te mana whakahaere: Mā te Mana Tukanga Matatau (APC) ka taea te pupuri i ngā mahi kia tata ki te taumata tino pai me te kore e whakaiti i te kounga.
He mea nui ēnei mahi whai hua, nā te mea ko ngā utu pūngao te wāhanga matua o ngā utu whakahaere o tētahi wāhanga whakahoro.
Ngā Āhuatanga Haumaru me te Taiao
Ka mahi ngā mīhini whakatō wai i raro i ngā pāmahana me ngā pēhanga teitei, ā, he maha ngā wā ka taea te whakahaere i ngā rauemi mura, paitini, waikura rānei. Nō reira, me noho te haumaru hei kaupapa matua:
– Parenga pēhanga: He takirere whakaora me te pūnaha mura hei ārai i te pēhanga nui.
– Whakahaere turuturu: Te hiri i ngā papu, i ngā parepare, me ngā pūnaha kimi hau.
– Rauemi hanga: Kōwhiringa o ngā rauemi ātete-waikura (hei tauira, te maitai kore waikura, ngā koranu motuhake) e ai ki ngā āhuatanga matū.
– Ngā tukunga me ngā para: Te whakahaere i te VOC (ngā matū waro mimiti), te maimoatanga o te waikura, me te aukati i te tukunga o ngā rauemi morearea.
Mā te whakatutuki i ngā paerewa (hei tauira, API/ASME) me te whakatinanatanga o te HAZOP me ngā tikanga whakahaere tino kaha ka āwhina nui ki te ārai i ngā aituā.
Te Katinga
Ko te mārama ki ngā mīhini whakatō i roto i te umanga matū ko te mārama ki te taunekeneke i waenga i te thermodynamics, te whakawhiti papatipu, te whakawhiti wera, te hoahoa taputapu, me ngā rautaki whakahaere. Ehara i te mea he taputapu wehewehe noa iho te whakatō, engari he pūnaha whakauru e whakatau ana i te kounga o te hua, te whakapaunga pūngao, me te haumaru o te tukanga. Mā te whiriwhiri i te tikanga whakatō tika, te hoahoa pou tika, me te whakahaere whai hua me te whakahaere, ka taea e te umanga te whakaputa hua matū parakore teitei i te taha ōhanga me te haumaru.
Ki te hiahia koe, ka taea e au te whakarerekē i tēnei tuhinga kia hangarau ake (me ngā tauira o ngā tataunga ōwehenga reflux, ngā wāhanga ariā, te McCabe-Thiele rānei) kia rongonui ake rānei mō te kaipānui whānui.
