53 Improvement of efficiency of Stripper & MEE Plants BEFORE Vapour to main condenser CT water OUT CT water IN CT water OUT CT water IN Stripper Distillate AFTER Vapour to main condenser CT water OUT CT water IN Chilled water OUT Chilled water IN Stripper Distillate Uncondensed Vapour from main condenser to Sec. vent condenser • Process high TDS effluent gets generated from production on a daily basis • This effluent comes as input to the stripper • Most of the organic solvents get distilled and come out of the stripper as distillate • This stripper distillate is sent for co-processing to cement industries • Un-condensed vapour output goes to MEE (Multiple Effect Evaporator) • Currently, Cooling Tower (CT) water is being circulated in both primary & secondary condensers of the stripper to condense the organic vapours Action Taken: • Utility line modification is performed for Secondary condenser • The Secondary condenser that was being circulated by CT water is now replaced with Chilled water (+5 deg C) Impact: • Left over vapour from the primary condenser travels through secondary condenser which is being circulated chilled water • As a result, more condensate gets recovered from Stripper as a distillate • This result is an increase in the COD of stripper distillate • Cement industries will accept more disposal due to the high calorific value of stripper distillate, which helps us dispose of it smoothly • Undistilled output from stripper is of less COD & is routed to MEE plant • Due to low COD of condensate MEE plant MEE condensate COD, the effluent can be treated in bio ETP easily • MEE condensate quality is improved as it is of less COD • As a result, steam consumption to treat the effluents in MEE comes down resulting in savings on the steam Chilled water i ter IN
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