Cov khoom siv evaporator hauv kev tsim yuav tsum tau them sai sai rau cov teeb meem dab tsi

Evaporators yog dav siv nyob rau hauv tshuaj, khoom noj khoom haus, lub teeb kev lag luam thiab lwm yam lag luam. Nws feem ntau yog ua kua evaporation thiab crystallization. Yog tias qhov tsim ntawm evaporator tsim nyog, lub neej ntawm evaporator tuaj yeem txuas ntxiv thiab cov evaporator tuaj yeem ua haujlwm ruaj khov.

Yog li ntawd, cov khoom siv evaporator yuav tsum tau them sai sai rau cov teeb meem hauv qab no hauv kev tsim:
1. Kev mus rau pem hauv ntej thiab thim rov qab. Feem ntau, cov kev taw qhia ntawm cov khoom siv lub voj voog ntawm lub evaporator yog tib yam li lub voj voog ntawm lub voj voog, thiab qee zaum cov kev taw qhia ntawm cov khoom siv ntawm lub evaporator yog qhov sib txawv ntawm lub voj voog. Txawm hais tias lub voj voog twg raug xaiv, lub hauv paus ntsiab lus ua raws li evaporative crystallization yog tias cov khoom nyob rau hauv lub raj cua sov yuav tsum tsis txhob boil.

2, theem nrab chav overheating. Nyob rau hauv lub evaporator tsim xam, tus tsim qauv feem ntau siv qhov kub thiab txias ntawm chav tsev thib ob raws li cov dej saturated vapor kub ntawm lub siab ntawm lub evaporation chamber. Qee zaum, nws tsis haum. Thaum cov tshuaj boils, lub vapor nyob rau hauv lub npuas muaj ib tug zoo sib xws kub. Nyob rau ntawm qhov kub thiab txias ntawm cov tshuaj, cov pa hauv cov npuas overheats vim qhov nce ntawm qhov kub ntawm cov tshuaj. Tshwj xeeb tshaj yog rau cov concentration ntawm cov ntaub ntawv nrog ib tug loj nce nyob rau hauv boiling point (xws li NaOH, MgCL2, KOH, CaCL2, thiab lwm yam), yog hais tias lub concentration ntawm cov khoom yog loj, lub superheat ntawm lub thib ob chav yog loj dua. Qhov ntau dua qhov superheat ntawm cov chav thib ob, qhov loj dua qhov txo qis ntawm cov cua sov hloov coefficient. Yog li ntawd, nyob rau hauv lub tsim ntawm lub evaporator, nws yog tsim nyog los xav txog tej yam yooj yim kev ntsuas los mus tshem tawm cov overheating ntawm lub thib ob chav, thiab cov nyhuv ntawm kev txo corrosion, txhim khu lub tshav kub hloov thiab rov qab tau cov cua sov zog.

3. Cov yam ntxwv cuam tshuam rau crystal loj. Yuav ua li cas tswj qhov luaj li cas thiab particle loj tis ntawm ntsev hais kuj yog ib qho teeb meem tseem ceeb uas yuav tsis raug ignored. Lub hauv paus ntsiab lus tseem ceeb uas yuav tsum ua raws li hauv cov txheej txheem tsim yog tias supersaturation ntawm cov tshuaj yuav tsum tau tswj nruj heev kom cov txheej txheem crystallization tshwm sim hauv thaj tsam metastable nrog qhov qis tshaj qhov ua tau supersaturation. Tus tsim yuav tsum raug xaiv tus nqi ntawm cov kev daws teeb meem, tus nqi ntawm flash evaporator ncig, thiab tiv thaiv kom tsis txhob pub lub flash.

4. Qhov chaw thiab cov txheej txheem rau kev tso pa tawm tsis yog condensable. Thaum cov khoom yog concentrated, nws tso pa roj thiab evaporates. Txhua qhov cuam tshuam cua sov chav kuj muaj me me ntawm cov roj uas tsis yog condensable. Yog tias qhov chaw tso tawm ntawm cov roj uas tsis yog-condensable nyob rau hauv chav cua sov yog tsim los tsis raug, txoj kev tso tawm tsis zoo yuav ua rau cov roj uas tsis yog condensable maj mam sib sau hauv chav cua sov thiab nce. Yog tias cov roj uas tsis yog condensable tsis tuaj yeem tawm hauv lub sijhawm, cov cua kub hloov pauv coefficient ntawm condensate yuav txo qis, thiab lub peev xwm ntawm cov evaporator yuav txo qis. Yog li ntawd, kev saib xyuas yuav tsum tau them rau qhov chaw thiab cov txheej txheem ntawm cov pa tawm uas tsis yog condensable thaum tsim cov evaporator.