Tail gas catalyst for methanol/diesel oil co-combustion system and using method of tail gas catalyst

Abstract

The invention discloses a tail gas catalyst for a methanol / diesel oil co-combustion system and a using method of the tail gas catalyst, and belongs to the field of vehicle tail gas catalysts. The tailgas catalyst for the methanol / diesel oil co-combustion system and the using method of the tail gas catalyst are used for solving the problem of tail gas of the combustion system. The tail gas catalyst is mainly prepared from the following components in parts by weight: 2-27 parts of sodium fatty acid methyl ester sulfonate, 30-40 parts of cerium oxide, 30-35 parts of neodymium fluoride, 2-4 partsof triethanolamine, 7.5-12 parts of polyisobutylene succinimide and 3.5-7 parts of molybdenum di(2-ethylhexyl)phosphorodithioate diisopropyl sulfurized oxomolybdenum dialkyldithiophosphate. The massratio of the tail gas catalyst for the methanol / diesel oil co-combustion system toand urea for a vehicle is (0.05 to 0.2):1, after uniform mixing, mixed liquor is obtained and added into a urea metering spraying device. The tail gas catalyst can effectively absorb harmful gas.

Description

technical field [0001] The invention belongs to the field of vehicle exhaust catalysts; in particular, it relates to an exhaust catalyst used in a methanol / diesel co-combustion system and a use method thereof. Background technique [0002] Methanol / diesel co-combustion technology is to inject methanol into the vehicle intake port and inject diesel into the cylinder to realize the combined combustion of the two fuels. When the engine is started and the car is warmed up, the pure diesel mode is used, and when the water temperature reaches the specified level, it is converted to diesel and methanol dual fuel operation. Utilizing the characteristics of large latent heat of vaporization of methanol, low cetane number, and high autoignition temperature, the combustion of diesel oil is optimized and adjusted to achieve efficient and clean combustion, thereby achieving the goal of saving diesel oil and enhancing power performance. However, due to the high latent heat of vaporizatio...

AI Technical Summary

Problems solved by technology

However, in the process of complex physical and chemical reactions in the SCR system, including atomization, fragmentation, evaporation of urea solution, energy and momentum exchange between droplets and exhaust gas, particle collision process, liquid film formation, NO x The catalytic reduction reaction of urea, etc., and the atomization field and temperature field formed after urea injection change with the change of engine operating conditions. When urea droplets decompose into ammonia, they also generate cyanic acid, biuret, three Intermediate products such as polycyanic acid, easy to form deposits such as urea crystal stones

Deposits build up and can cause nozzle clogging

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