Steam is supplied to a two-stage turbine at 40 bar and 500 degree C. In the first stage the steam expands isentropically to 3 middot 0 bar at which pressure 2500 kg/h of steam is extracted for process work. The remainder is reheated to 500 degree C and then expanded isentropically to 0.06 bar. The by-product power from the plant is required to be 6000 kW. Calculate the amount of steam required from the boiler, and the heat supplied in kW. Neglect feed pump terms, and assume that the process condensate returns at the saturation temperature to mix adiabatically with the condensate from the condenser. (15 000 kg/h; 15 620 kW)
Steam is supplied to a two-stage turbine at 40 bar and 500 degree C. In the first stage the steam expands isentropically to 3 middot 0 bar at which pressure 2500 kg/h of steam is extracted for process work. The remainder is reheated to 500 degree C and then expanded isentropically to 0.06 bar. The by-product power from the plant is required to be 6000 kW. Calculate the amount of steam required from the boiler, and the heat supplied in kW. Neglect feed pump terms, and assume that the process condensate returns at the saturation temperature to mix adiabatically with the condensate from the condenser. (15 000 kg/h; 15 620 kW) For the plant of problem 7.7 it is required to improve the efficiency by employing regenerative feed heating by taking off the necessary bleed steam at the same point as the process steam. The process steam is not returned to the boiler but make-up water at 15 degree C is supplied. The bleed steam is mixed with the condensate and make-up water at 3 middot 0 bar such that the resultant water is at the saturation temperature corresponding to 3 middot 0 bar. Calculate the steam supply necessary to meet the same power and process requirements, and the amount of bleed steam. Neglect feed pump terms. Calculate also the heat supplied in kW. (16 500 kg/h; 2670 kg/h; 15 500 kW)
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