Abstract
This study presents the thermodynamic model of a heat, power and gas cogeneration system. The energy utilization coeffi cient m, which is the ratio of the sum of gas calorifi c value and heat supplied to the boiler to the low calorifi c value of coal, is used as a criterion to evaluate the performance of the multi-production system. The emphasis was placed on the vaporization of the coal and the combustion in the boiler. For gas output 10,000 m 3 ·h −1 and boiler steam load 130 t·h −1 , the change of gross coal consumption and energy available coeffi cient m of the cogeneration system is calculated at different pyrogenation temperatures with three types of coals. The results show that the energy available coeffi cient has a maximum value for the cogeneration system, and the gross coal consumption of the cogeneration system is lower than that of two separation systems. In a large range of feeding coal to the boiler, the system gross coal consumption reaches its minimum value and the energy available coeffi cient m reaches maximum when pyrogenation temperature is 700°C. And the optimal is realized at a higher temperature.
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