Performance of hydrogen and power co-generation system based on chemical looping hydrogen generation of coal

Abstract

An integrated hydrogen and power co-generation system based on slurry-feed coal gasification and chemical looping hydrogen generation (CLH) was proposed with Shenhua coal as fuel and Fe 2 O 3 /MgAl 2 O 4 as an oxygen carrier. The sensitivity analyses of the main units of the system were carried out respectively to optimize the parameters. The syngas can be converted completely in the fuel reactor, and both of the fuel reactor and steam reactor can maintain heat balance. The purity of hydrogen produced after water condensation is 100%. The energy and exergy analyses of the proposed system were studied. Pinch technology was adopted to get a reasonable design of the heat transfer network, and it is found pinch point appears at the hot side temperature of 224.7 °C. At the given status of the proposed system, the hydrogen yield is 1040.11 kg·h −1 and the CO 2 capture rate is 94.56%. At the same time, its energy and exergy efficiencies are 46.21% and 47.22%, respectively. According to exergy analysis, the degree of exergy destruction is ranked. The gasifier unit has the most serious exergy destruction, followed by chemical looping hydrogen generation unit and the heat recovery steam generator unit. • A hydrogen and power co-generation system is proposed and simulated. • Slurry-coal gasification is integrated with chemical looping hydrogen and combined cycle. • Assessing hydrogen production based on chemical looping conversion of fossil fuels. • Pure hydrogen can be achieved with high carbon capture efficiency through process integration.