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Back Pressure Steam Turbine (BPST) System Basics

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Many industrial complexes produce steam at pressures higher than required for actual process needs; in these cases, a pressure reducing valve (PRV) is used to reduce the steam pressure to a desired level. Replacing a PRV with a back pressure steam turbine generator (BPST) provides the same pressure-reducing function while converting a portion of this steam energy into electricity. Placing the steam turbine in parallel with an existing PRV allows generation of valuable on-site electricity and also reduces steam pressure to the required level, saving money and increasing overall system efficiency. BPSTs used in conjunction with a heat recovery steam generator (HRSG) can also be used to recover flue stack heat from industrial processes and convert a portion of this thermal energy into electricity before providing steam for process or space heating needs.