Nazarin Thermodynamics na Injiniya kan Tsarin Boiler na Masana'antu
Pendahuluan
Tukunyar masana'antu tana ɗaya daga cikin muhimman kayan aiki a sassa daban-daban—daga tashoshin wutar lantarki da masana'antun sinadarai zuwa ɓangaren litattafan almara da takarda, har ma da masana'antar abinci da abin sha. Babban aikinsu shine canza makamashin sinadarai daga mai (ko makamashin lantarki a cikin tukunyar lantarki) zuwa makamashin zafi, sannan a mayar da shi zuwa ruwa don samar da tururi a takamaiman matsin lamba da yanayin zafi. Sannan ana amfani da wannan tururin don dumamawa, bushewa, tsaftacewa, ko kuma a matsayin ruwan turbine mai aiki. Domin tsarin tukunyar ya yi aiki lafiya, tattalin arziki, da inganci, ana buƙatar nazarin injiniyan thermodynamic, gami da daidaiton makamashi, inganci, asarar zafi, da kuma nazarin rashin juyawa.
Ka'idojin Asali na Thermodynamics a cikin Boilers
A cikin sharuddan thermodynamic, gabaɗaya ana nazarin boilers a matsayin tsarin kwarara mai ƙarfi wanda nauyin ruwan abinci ke shiga, yana karɓar zafi daga ƙonewa, sannan ya fita a matsayin tururi mai cike ko tururi mai zafi sosai. Dokar Farko ta Thermodynamics don tsarin kwarara mai ƙarfi (daidaitaccen makamashi mai gudana) za a iya faɗi a sauƙaƙe:
\[
\dot{Q} – \dot{W} = \dot{m}(h_{out}-h_{in})
\]
A cikin boilers, yawanci ana yin watsi da aikin shaft (\(\dot{W}\)) saboda boilers ba ya samar da aikin injiniya kai tsaye. Ƙarfin motsi da yuwuwar su ma ƙanƙanta ne idan aka kwatanta da canjin enthalpy, don haka lissafin aiki ya zama:
\[
\dot{Q} \approx \dot{m}(h_{steam}-h_{fw})
\]
Nan ne enthalpy ya zama mahimmin ma'auni. Ana samun bayanai game da enthalpy na ruwa da tururi daga tebura ko zane-zanen Mollier (h–s). Ruwan ciyarwa a wani matsin lamba da aka bayar na iya zama ruwan da ba a sanyaya shi ba, yayin da fitarwa na iya zama tururi mai cike da bushewa, tururi mai danshi (wanda ke ɗauke da ingancin tururi x), ko tururi mai zafi sosai.
Tsarin Dumama Ruwa zuwa Tururi
A fannin thermodynamic, dumama ruwa a cikin tukunyar jirgi yana ta matakai da dama:
1. Sanyaya ruwa (madaidaiciyar dumama)
Ana ɗaga ruwan a yanayin zafi daga shiga zuwa yanayin zafi mai ɗumi a lokacin matsin lamba. Ƙarfin da ake buƙata ya yi daidai da ƙarfin zafi da ƙaruwar zafin jiki.
2. Tururi (canjin lokaci / dumama a ɓoye)
A lokacin da zafi ke ƙaruwa, ƙarin zafi yana haifar da canjin yanayi daga ruwa zuwa tururi. A wannan lokacin, zafin jiki yana ci gaba da kasancewa ba tare da wani canji ba, amma enthalpy yana ƙaruwa sosai saboda zafin da ke ɓoye na tururi.
3. Dumamawa sosai (idan akwai na'urar dumama mai zafi)
Ana ƙara dumama tururin da ya cika don ɗaga zafinsa sama da zafin da ke cikinsa a matsi ɗaya. Zafi mai yawa yana ƙara enthalpy kuma yana rage danshi na tururin, wanda ke da amfani ga aikace-aikacen turbin da ingancin sarrafawa.
A cikin ƙirar boiler na zamani, sau da yawa ana inganta farfadowar zafi tare da ƙarin kayan aiki kamar masu tattalin arziki (masu dumama ruwa), masu dumama iska (masu dumama iska mai ƙonewa), da masu dumama ruwa. Kowannensu yana da nufin rage asarar tarin abubuwa da kuma ƙara ingancin canja wurin zafi.
Daidaiton Makamashi da Ingancin Boiler
Ingancin tukunyar jirgi gabaɗaya ana bayyana shi a matsayin rabon makamashi mai amfani da ruwa/tururi ke sha zuwa makamashin sinadarai na man da aka ƙone. Hanyoyi guda biyu da suka shahara sune:
1. Hanyar kai tsaye (hanyar kai tsaye / hanyar shigarwa-fitarwa)
\[
\eta_{boiler}=\frac{\dot{m}_{steam}(h_{steam}-h_{fw})}{\dot{m}_{fuel}\times LHV}\times 100\%
\]
Tare da LHV (Ƙaramin Ƙimar Dumama) ko HHV (Ƙimar Dumama Mafi Girma) dangane da ma'aunin da aka yi amfani da shi.
2. Hanyar da ba ta kai tsaye ba (hanyar rage zafi)
Ana ƙididdige inganci daga kashi 100% ban da jimlar asarar zafi, misali:
- Asarar iskar gas mai bushewa
- Asarar da tururin ruwa ya haifar sakamakon konewar hydrogen
- Asara saboda man fetur da danshi na iska
- Asara saboda rashin ƙona carbon
- Ragewar radiation da convection daga saman tukunyar jirgi
- Asarar fashewa
Sau da yawa ana amfani da hanyoyin da ba kai tsaye ba don tantance makamashi saboda suna taimakawa wajen gano manyan hanyoyin rashin inganci.
Babban Asarar Zafi a Aikin Boiler
Kyakkyawan nazarin thermodynamic bai tsaya kan lissafin fitarwa-shigarwa ba, amma kuma yana nuna asarar makamashi mafi rinjaye.
1. Asarar tarin abubuwa (asarar bututun hayaki)
Iskar gas da ke fita a yanayin zafi mai yawa tana ɗauke da babban enthalpy. Ana iya yin ƙoƙarin rage hakan ta amfani da na'urorin tattalin arziki da na'urorin dumama iska, amma dole ne a yi taka-tsantsan don tabbatar da cewa ba su wuce wurin raɓar acid ba (musamman ga mai ɗauke da sulfur) don hana tsatsa.
2. Fashewa
Busar da ruwa wajibi ne don sarrafa yawan daskararrun da aka narkar (TDS) a cikin bututun mai. Duk da haka, cire wannan ruwan zafi yana nuna asarar enthalpy. Tsarin dawo da zafi na busar da ruwa zai iya amfani da wannan zafin don dumama ruwan abinci ko ruwan shafawa.
3. Iska mai yawa da ƙonewa mara cikawa
Iska mai yawa tana da mahimmanci don ƙonewa mai ɗorewa, amma iska mai yawa tana ƙara yawan iskar gas ɗin, wanda ke ƙara asarar tarin. Akasin haka, rashin isasshen iska yana haifar da ƙaruwar CO2 da man fetur da ba a ƙone ba—dukansu suna da illa. Ana samun ingantaccen amfani ta hanyar sarrafa iskar gas O₂/CO2 da kuma daidaita wutar.
4. Hasken rana da kuma fitar da iska daga saman
Rashin kyawun rufin zafi yana ƙara asarar zafi ga muhalli. Ingantawar juriya da rufin gabaɗaya yana da tasiri kai tsaye ga inganci da aminci.
Binciken Ayyuka: Kimanta Ingancin Makamashi
Baya ga makamashi (Dokar I), thermodynamics na injiniyanci na zamani sau da yawa suna amfani da nazarin motsa jiki don tantance "ingancin" makamashi da rashin iya jurewa (Dokar II). Exergy yana bayyana matsakaicin aikin da za a iya samu lokacin da aka kawo tsarin zuwa yanayin muhallinsa.
A cikin boilers, babban rashin iya jurewa yana faruwa a lokacin da:
- Tsarin konewa (halayen sinadarai da haɗuwa a yanayin zafi mai yawa)
- Canja wurin zafi tare da babban bambancin zafin jiki, misali tsakanin harshen wuta da saman bututu
- Gogayya a gefen iskar gas da ruwa/tururi (rage matsin lamba)
Tare da nazarin gwaji, masu aiki za su iya gano cewa duk da cewa ana canja wani zafi zuwa ruwa, ingancin makamashin yana raguwa saboda rashin iya jurewa na aikin. Wannan yana taimakawa wajen fifita gyare-gyare: misali, inganta rarrabawar iska da mai, ƙara dawo da zafi, ko rage yawan ΔT mai yawa a cikin na'urar musayar zafi.
Tasirin Yanayin Aiki akan Aikin Zafi
Aikin tukunyar jirgi yana da matuƙar tasiri ta hanyar matsin lamba, zafin jiki da ingancin ruwa.
1. Matsin lamba na aiki
Ƙara matsin lamba yana ƙara zafin jikewa. Ga wasu buƙatun tsari, wannan na iya ƙara yawan kuzarin tururin. Duk da haka, matsin lamba mafi girma yana buƙatar kayan aiki masu ƙarfi da kuma sarrafawa mai ƙarfi.
2. Ciyar da zafin ruwa
Mafi girman zafin ruwan abinci, haka nan ƙarancin zafi da tukunyar ke buƙata don cimma yanayin tururin da ake so. Saboda haka, na'urar rage zafi da mai tattalin arziki suna taka muhimmiyar rawa.
3. Ingancin ruwa (magani)
Matakan iskar oxygen da suka narke, tauri, da TDS suna shafar sikelin da tsatsa. Tsaftacewa yana ƙara juriyar zafi, yana haifar da mummunan canja wurin zafi, ƙara yawan zafin ƙarfe, raguwar inganci, da kuma ƙaruwar haɗarin lalacewar bututu.
Tsarin Inganta Inganci Mai Tushen Thermodynamics
Wasu matakai masu amfani waɗanda ke da alaƙa kai tsaye da nazarin thermodynamics sun haɗa da:
- Shigarwa/inganta tattalin arziki don amfani da zafi na iskar gas don dumama ruwan abinci.
- Na'urar dumama iska don ƙara yawan zafin iskar ƙonewa, inganta kwanciyar hankali da inganci na harshen wuta.
– Kula da gyaran O₂ don kiyaye iska mai yawa.
- Inganta iskar gas da kuma dawo da zafi don rage asarar enthalpy.
– Kula da saman canja wurin zafi (tsaftace ƙura/sikelin) don kiyaye yawan canja wurin zafi mai yawa.
- Kyakkyawan rufi akan bututun tururi, ganga da harsashi.
- Ci gaba da sa ido kan sigogin thermodynamic (T, P, yawan kwarara, iskar gas ta O₂/CO2) don gano bambance-bambance da wuri.
Kammalawa
Nazarin thermodynamics na injiniya a cikin tsarin tukunyar masana'antu yana ba da tsarin nazari mai ƙarfi don fahimtar yadda ake mayar da makamashi daga mai zuwa tururi, yayin da kuma gano wuraren asara waɗanda ke rage inganci. Ta hanyar amfani da ma'aunin makamashi (Dokar Farko) da kuma ƙara masa da hangen nesa na aiki (Dokar Ta Biyu), injiniyoyi za su iya yanke shawara bisa ga bayanai don inganta inganci, rage yawan amfani da mai, kiyaye amincin kayan aiki, da kuma tsawaita rayuwar aiki a cikin tukunyar. A ƙarshe, tukunyar da aka inganta ta hanyar thermodynamics ba wai kawai tana adana farashi ba har ma tana tallafawa rage fitar da hayaki da kuma ayyukan masana'antu masu ɗorewa.
