Ammonia-engine system

摘要

An ammonia-engine system is capable of supplying an ammonia cracking catalyst with a temperature necessary to promote a reaction even during low load operation in which a temperature of an exhaust gas from an ammonia engine is lower than an operating temperature of the ammonia cracking catalyst. In an ammonia-engine system provided with an ammonia engine (2) using ammonia as fuel and an ammonia cracking device (5) including an ammonia cracking catalyst that cracks ammonia and cracking ammonia to produce hydrogen, an ammonia oxidizing device (4) is provided between the ammonia engine (2) and the ammonia cracking device (5).

主权项

1. An ammonia-engine system, comprising:
an ammonia engine employing ammonia supplied from a NH3 tank directly used as fuel; an ammonia cracking device comprising an ammonia cracking catalyst that cracks ammonia from the NH3 tank to produce hydrogen,
wherein the temperature of the ammonia supplied therein and the ammonia cracking catalyst increase due to heat exchange between the exhaust gas from the ammonia engine and the ammonia,wherein the hydrogen-containing ammonia-cracked gas produced in the ammonia cracking device is supplied to the ammonia engine as a combustion improver for the ammonia engine; and an ammonia oxidizing device, provided between the ammonia engine and the exhaust gas introduction side of the ammonia cracking device, to provide heat to the ammonia cracking device at start-up of the ammonia engine by oxidizing ammonia according to the following formula:
NH3+3/4O2→1/2N2+3/2H2O  (1), wherein the heat provided by the ammonia is sufficient to heat the ammonia cracking catalyst in the ammonia cracking device to a temperature of 290° C. or greater.