Power generating plant
View Patent ↗Coal is reacted in a furnace 22 to obtain a coal gasification gas. The coal gasification gas is cooled by a gas cooler 23 , passed through a porous filter 24 , and desulfurized by a desulfurizer 25 to produce a CO-containing gas as an anode. The CO gas-containing gas is subjected to an exothermic reaction in a shift reactor 26 to form H 2 and CO 2 , and the anode gas containing H 2 is supplied to an anode 7 of MCFC 2 . Thus, in the absence of an extra heat source and a heat exchange source, a desired anode gas is obtained from the coal gasification gas, and with heat buildup of the MCFC 2 being inhibited and its performance being maintained, reduction of CO 2 is taken into consideration. A power generating plant equipped with the MCFC 2 capable of using a coal gasification fuel substantially containing a CO gas is thus achieved.
1. A power generating plant, comprising:
a coal gasification furnace that burns coal to obtain a fuel gas;
a gas treatment unit that converts the fuel gas obtained by the coal gasification furnace into a desired CO gas-containing gas;
a shift reaction unit that subjects the CO gas-containing gas obtained by the gas treatment unit to a chemical reaction to form H 2 and CO 2 ;
a molten carbonate fuel cell which has an anode supplied with an anode gas containing H 2 obtained by the shift reaction unit, which has a cathode supplied with a cathode gas containing pure oxygen and a CO 2 gas, and which performs power generation by an electrochemical reaction between the anode gas and the cathode gas;
a combustor for burning a cathode exhaust of the cathode and an anode exhaust of the anode;
a turbine for expanding a combustion gas from the combustor to obtain power;
waste heat recovery equipment which performs heat recovery of an exhaust from the turbine to generate steam, drives a steam turbine to obtain power, and cools the exhaust subjected to the heat recovery for separation into water and a CO 2 gas;
a CO 2 compressor for compressing the CO 2 gas separated by the waste heat recovery equipment and pressure-feeding the compressed CO 2 gas to the cathode; and
an oxygen supply system for supplying pure oxygen at a predetermined pressure to the CO 2 gas compressed by the CO 2 compressor, and
wherein the gas treatment unit comprises:
a gas cooling unit that cools the fuel gas obtained by the coal gasification furnace with the water separated by the waste heat recovery equipment,
a desulfurization unit that desulfurizes the fuel gas cooled by the gas cooling unit to form the desired CO gas-containing gas, and
a steam supply system for supplying steam, which has been obtained by cooling the gas by the gas cooling unit, to the CO gas-containing gas desulfurized by the desulfurization unit, and
the power generating plant further comprising:
a heating-up unit that supplies the cathode exhaust to the cathode gas containing pure oxygen and a CO 2 gas on an inlet side of the cathode to raise a temperature of the cathode gas.
2. The power generating plant according to claim 1 , comprising:
a plurality of the shift reaction units provided in parallel downstream of the steam supply system.