化工过程机械专业研究生专业英语讲座-(公开课件).ppt

Process Technology Utility Systems around You Power supply system (electricity) Tap water system (running water) Gas supply system Telephone line Internet connection system (ISP, ADSL) Cable TV system Global positioning system (GPS) Utilities billing system Objectives – to describe Basic components of a steam system a raw water system a fire water system a cooling water system an air system a nitrogen system a gas system an electrical system an industrial sewer system a process refrigeration system a relief and flare system Utility Boiler (Wujing) Coal fired boiler (Waigaoqiao) Provance Power Plant Introduction to Process Systems Chemical plants and refineries include unique combinations of equipment and systems that are used to separate materials into pure or relatively pure products. Examples of process systems include reactions, distillation, absorbing/stripping, adsorption/drying, crystallization, evaporation, extrusion, extraction, filtering, screening, and utility systems. Plant utility systems typically include, steam generation, compressed air and gases, water treatment, and cooling tower operations. Steam Generation Systems Boiler (fire tube or water tube) Steam header system (low, medium and high pressure) Condensate return system (steam traps, valves, piping, pumps) Deaerator system Steam systems can include super high pressure (SHP) steam generation and distribution, high pressure (HP) steam, medium pressure (MP) steam and low pressure (LP) steam Steam Generation Systems Super High Pressure (1000-1200 psig) High Pressure Steam System (400-800 psig) Medium Pressure Steam System (180 to 200 psig) Low Pressure Steam (50-60 psig) * 1 psi = 6895 Pa = 0.006895 MPa =0.06895 bar；1bar = 14.50 psi Condensate Recovery System The condensate recovery system is separated into clean and suspect (dirty) condensate sections. Clean condensate is routed to the deaerator. Suspect condensate is collected from steam users where the process side pressure