Equivalence ratio combustion natural gas engine three-way catalytic system and design method thereof

Abstract

The invention discloses an equivalence ratio combustion natural gas engine three-way catalytic system and a design method thereof. The equivalence ratio combustion natural gas engine three-way catalytic system comprises an inlet gas module, a reactor module, an outlet gas module and a surface catalytic reaction module. The three-way catalytic system comprises a heating unit, wherein the heating unit can heat the reactor module; a water spraying device arranged between the inlet gas module and the reactor module; a detection unit used for detecting the oxygen concentration and the exhaust temperature of the exhaust position of the outlet gas module; and an ECU, wherein the ECU receives and processes data of the detection unit. According to the three-way catalytic system, the temperature andthe water spraying amount of a reactor can be flexibly adjusted according to the oxygen concentration in exhausted gas, and the design precision of the three-way catalytic system can be improved through the design method combining calculation, prediction and testing.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a three-way catalytic system of an equivalence ratio combustion natural gas engine and a design method thereof. Background technique [0002] As my country's energy and environmental problems become increasingly prominent, using natural gas as vehicle power has become one of the effective ways to adjust my country's vehicle energy consumption structure and reduce harmful emissions from vehicles. In order to meet the increasingly stringent emission standards, equivalence ratio combustion combined with three-way catalytic converter technology has become a more efficient and economical emission control solution for natural gas engines. The natural gas engine with equivalent ratio combustion has better performance in terms of power performance and fast transient response. It can also use a three-way catalytic system as an after-treatment device, and the cost of emission control is lo...

AI Technical Summary

Problems solved by technology

It has been shown that noble metal Pd / Rh catalysts are effective for CH 4 Oxidation and NO reduction catalytic effects are relatively obvious, but the price of Rh is high

In addition, the current OEMs mostly control the oxidation and reduction reactions in the three-way catalytic converter by adjusting the oxygen concentration, and seldom consider the influence of water and temperature on these chemical reactions. Optimal Pd / Rh ratio three-way catalytic converter to meet emission requirements and economic requirements

At the same time, the current design of catalytic converters mostly adopts the method of empirical or fixed pollution source emission tests for the design and selection of catalytic converters, which is time-consuming and labor-intensive. It is difficult to complete many working conditions and the design accuracy is low.

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