Abstract:

Both the process simulations by ASPEN PLUS and the combustion and heat transfer simulations of top-fired steam reformer by REFORM-3PC are carried out for the CO₂ emission reduction of hydrogen production unit with steam reforming process. The simulation results show that for the existing hydrogen production unit with top-fired steam reformer, the optimum CO₂ removal rate is no more than 60%, but 100% CO₂ removal rate can be achieved by decreasing the turndown ratio of the unit. After CO₂ removal, the hydrogen recovery rate in hydrogen purification section will be increased, and the consumption of feedstock and makeup fuel will be reduced. The rise of tube wall temperature of reformer, the rise of combustion temperature and the decrease in flame length are the main risk factors after CO₂ removal, and the preliminary solutions are put forward.

Key words:

carbon dioxide emission reduction')">"> carbon dioxide emission reduction, hydrogen production unit, reformer, burning, heat transfer, hydrocarbon steam reforming, carbon dioxide removal