The conventional coal-based power and chemicals multi-generation are all based on coal gasification.The proposed coal-fired power station combined calcium carbide multi-generation system has simple processes and high efficient of waste heat recovery

which integrates the oxygen-fuel method based calcium carbide reactor system with the boiler combustion system.By taking a supercritical 350 MW unit coal-fired unit combined with a 0.3 Mt/a calcium carbide production system as the example

the relative energy saving ratio

cost of co-production and CO2 emission per ten thousand yuan output value were used as three indicators to evaluate the system from energy

economy and environment aspects

respectively.The results show that

comparing with the stand alone system of both power generation and calcium carbide production

the relative energy saving ratio of the proposed multi-generation system is 18.52%.The calcium carbide cost is 685yuan/t and the power supply cost is 0.32yuan/(kW·h)

both of them are lower than the calcium carbide's price and network price in Shanxi province.The CO2 emission per ten thousand yuan output value is 19.79 t

which is 17.74%lower than that of the conventional coal-fired power unit.In conclusion

the multi-generation has prominent energy utilization

economic and environmental superiorities.