A control system and control method for nitrogen oxide emission of internal combustion engine

Abstract

The invention discloses an internal combustion engine nitrogen oxide emission control system and a control method of the internal combustion engine nitrogen oxide emission control system. The control system comprises an internal combustion engine, a fuel tank, an oxygen generation assembly, an exhaust gas recycling assembly, an inlet gas mixing chamber, a standby gas filling device and a gas inlet assembly, wherein the oxygen generation assembly, the exhaust gas recycling assembly and the gas inlet assembly are communicated with the inlet gas mixing chamber, the gas inlet assembly is communicated with the internal combustion engine, and the internal combustion engine is communicated with the exhaust gas recycling assembly and the fuel tank. According to the control system and the control method of the control system, a large amount of nitrogen in inlet gas of the internal combustion engine is filtered out based on the molecular film separation technology, so that nitrogen oxides generated after combustion in a cylinder are substantially reduced and the purpose of reducing nitrogen oxide emission of the internal combustion engine is achieved finally. The consumption of a large amount of ammonium hydroxide or urea and expensive catalysts is not needed, and therefore operating cost is low. The usage problems of difficulty in loading, unloading and storage of ammonium hydroxide and catalysts, poor safety and the like are solved. The control system is small in size and does not occupy a large space, and therefore difficulty in modification of traffic means like ships is reduced.

Description

technical field [0001] The invention relates to an internal combustion engine emission technology, in particular to an internal combustion engine nitrogen oxide emission control system and a control method thereof. Background technique [0002] With the development of modern technology, automobiles and ships have become indispensable means of transportation in people's lives. However, the nitrogen oxides in the exhaust of motor vehicles have a greater impact on the human body, especially for the elderly with high incidence of cardiovascular, cerebrovascular and respiratory diseases. Long-term exposure to this environment can also induce lung cancer. Among the air pollution caused by fuel combustion, nitrogen oxides are the most harmful and difficult to deal with. In addition, the International Maritime Organization has also proposed strict restrictions on the emission of sulfur compounds and nitrogen oxides from marine diesel engines. By 2016, the emission of nitrogen oxide...

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Problems solved by technology

Due to the limitations of the internal purification method, it is difficult to obtain satisfactory comprehensive indicators. The effect of pre-treatment technology on reducing engine emissions is obvious in the short term, but long-term operation will affect the reliability of the engine. The post-treatment SCR technology has the best emission reduction effect. Obviously, it has been applied on board at present, but the size of the reactor is large, a large amount of ammonia water or urea is consumed, the initial investment and operation costs are high, and there are also problems in the handling, storage and safety of urea and reduction catalysts

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