Abstract
The steam and electric power requirement for an industrial complex can be integrated in a cogeneration system achieving improved efficiency at comparatively lower plant costs. Various technical and economic parameters of a cogeneration plant in a petrochemical plant and a refinery in India are discussed. Both applications use industrial gas turbine and heat recovery boilers with supplementary firing using gaseous and/or liquid fuel. For the petrochemical complex, two 25 MW (ISO) industrial gas turbines and two 75 tonnes/hr. heat recovery boilers with provision for supplementary firing were selected to meet the 37 MW power demand and 150 tonnes/hr. (low pressure, saturated) steam demand. The plant is designed for natural gas fuel. The unit tested better than guaranteed. For the refinery application, two 25 MW (ISO) industrial gas turbines and two heat recovery boilers with supplementary firing were selected to meet a normal steam demand of 90 tonnes/hr. with a peak of 120 tonnes/hr. and a critical power demand of 15.6 MW with a normal demand of 22 MW. The fuel to be used is gas and/or distillate oil. The guaranteed plant efficiency was quoted as 79.25% (on L.H.V. basis). The plant is under construction and expected to go on line in early 1988.
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