The invention relates to an
ammonia gas automatic-supplying method of a
solid ammonia system heated by using engine
waste heat. The
ammonia gas automatic-supplying method of the
solid ammonia
system heated by using the engine
waste heat is characterized in that heating is conducted on an
ammonia storage material main container and an
ammonia storage material supplying container through a heating unit, when reaching a
desorption temperature, ammonia materials in the main container release
ammonia gas; and a pressure P1 in the
ammonia storage material main container reaches a
working pressure, a reducing-agent metering
control unit DCU conducts metering on the
ammonia gas, and the jet quantity of the
ammonia gas is metered according to engine operating parameters (rotate speed, fuel consumption and the like) transmitted by an engine ECU. The ammonia gas is jetted into an
exhaust pipe from the front end of an SCR
catalytic converter, the ammonia gas and engine
exhaust gas are mixed sufficiently, and under the effect of a catalyzer,
NOx is decontaminated into harmless water and a
nitrogen gas; and by utilizing the principle of the
pressure difference formed between the pressure P1 in the ammonia
storage material main container and a pressure P2 in the ammonia
storage material supplying container, the ammonia gas automatic-supplying
system convenient to achieve is designed; and the problem that the cruising capacity of an existing vehicle-mounted ammonia source is low is solved, and the ammonia gas automatic-supplying method of the
solid ammonia system heated by using the engine
waste heat is ingenious in idea, convenient to implement, high in reliability and good in economic efficiency.