A COMBINED HEAT AND POWER PLANT AND A PROCESS FOR THE OPERATION THEREOF

摘要

The invention provides a combined heat and power plant with an integrated g as production system. The combined heat and power plant contains a steam reform er heated with a gas burner which converts a mixture of hydrocarbons and water vapour into a reformate gas stream containing hydrogen and carbon monoxide. The plant further contains a reactor system with several stages for removing carbon monoxide from the reformate gas stream. The plant also contains a heat exchanger for removing heat energy fr om the reformate gas stream and a fuel cell unit for producing electrical energy by catalytic reaction of the hydrogen contained in the reformate gas with oxygen in the fuel cell, wherei n the reformate gas stream is supplied to the anode in the fuel cell unit and the anode wast e gas is taken to the gas burner of the steam reformer as fuel, via a gas pipe. The reactor system for removing carbon monoxide from the reformate gas stream contains, according to one embodiment of the invention, a low temperature shift reactor and a downstream methanisatio n reactor and the heat exchanger for cooling the reformate gas stream leaving the steam reform er to the inlet temperature of the low temperature shift reactor is located in the reformate gas stream between the steam reformer and the low temperature shift reactor. This combined heat and power plant is operated according to the invention in such a way that the reformate gas contains 5 to 10 vol.% of unreformed hydrocarbon which enables the flame in the gas burner to be monitored using an ionisation detector when burning the anode waste ga s in the gas burner of the steam reformer.