Thaum lub tshuab hluav taws xob tsim tawm chav dej, nws yog feem ntau ua rau lub taub hau roj, thiab muaj qee cov ntsev me me, pa roj ntsha, carbon dioxide thiab ammonia.
Thaum lub zog nrog impurities dhau los ntawm SuperHeater, qee cov impurities yuav ua rau kub ntawm cov hlau, thiab txawm ua rau cov kab nrib pleb hauv cov neeg mob hnyav. Qhov tseem ceeb impurities nkag mus rau hauv cov pa turbine ntawm boiler nrog lub chav. Lub chav nthuav dav thiab ua haujlwm nyob rau hauv lub chav turnine. Vim tias qhov poob ntawm lub zog siab, impurities yog precipitated thiab sau cov kab ntawm cov hniav txaus, ua rau txo qis hauv cov khoom siv hluav taws xob thiab kev ua haujlwm ntawm lub chav huv.
Tsis tas li ntawd, cov ntsev cov ntsiab lus tau nce hauv chav ua hluav taws xob tseem ua kom nws nyuaj qhib lub valve thiab kaw nws laxly. Raws li rau cov chav dej ntau lawm thiab cov khoom lag luam muaj nyob rau hauv lub chav yog ntau dua li cov nqi uas tau hais tseg, nws yuav cuam tshuam cov khoom lag luam zoo thiab ua cov txheej txheem ua tau zoo. Yog li ntawd, qhov zoo tshaj ntawm cov chav xa tawm los ntawm cov qauv roj yuav tsum tau ua kom tau ib qho tseem ceeb ntawm chav boiler ntawm chav tsim hluav taws xob yuav tsum raug kho.