HC (hydrocarbon compound) emission purifying system used for cold boot working condition of gasoline engine

A purification system and cold start technology, applied in the direction of machines/engines, exhaust treatment, mechanical equipment, etc., can solve the problems of long-term emission of harmful components without purification, harmful gas emissions, etc., to achieve internal structure improvement, effective Adsorption and purification, the effect of improving adsorption and purification performance

Inactive Publication Date: 2012-01-18
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When it can be started, it is often because the catalytic converter has not reached the ignition temperature, causing some harmful gases to be discharged without purification. If it is in winter, the time for harmful components to be discharged without purification will be longer

Method used

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  • HC (hydrocarbon compound) emission purifying system used for cold boot working condition of gasoline engine
  • HC (hydrocarbon compound) emission purifying system used for cold boot working condition of gasoline engine
  • HC (hydrocarbon compound) emission purifying system used for cold boot working condition of gasoline engine

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Embodiment Construction

[0025] like image 3 As shown, both the adsorber 2 and the adsorption catalyst 3 use a mesh body (with 46.5 units / cm 2 , a cordierite monolithic support with a wall thickness of 0.0152 cm and a catalyst capacity of 1.0 L) structure. Wherein the schematic diagram of the unit cross-section of the adsorber 2 is shown as Figure 4 as shown, Figure 5 Its A-A plane sectional view. A certain amount of ZSM-5-3 zeolite and β-2 zeolite powder, silica sol and pure water are poured into a ball mill for grinding to obtain an adsorbent slurry solution. The slurry solution was coated on the cordierite carrier, and after the excess slurry solution in the air flow removal unit, it was dried in the air flow at 50°C for 30 minutes, then dried in the air flow at 150°C for 15 minutes, and then dried at 400°C Bake for 1 hour, repeat the above coating steps until the coating weight is 350g / dm after baking 3 . Then, the adsorbent slurry solution is again coated on the area of ​​30%~50% of the ...

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Abstract

The invention provides an HC (hydrocarbon compound) emission purifying system used for a cold boot working condition of a gasoline engine, belonging to the field of emission pollution control of gasoline engines, and in particular relating to an emission control system for purifying HCs in waste gases of the gasoline engines. Firstly, adsorbent materials are selected and internal structures of an absorber and an adsorption catalyst are improved so as to improve the absorption and purification efficiencies; and then each part is arranged reasonably so as to control the HCs. An adsorbent is obtained by physically mixing high-adsorption-capacity ZSM-5-3 zeolites with higher-desorption-temperature beta-2 zeolites; waste gas channels of the absorber and the adsorption catalyst are of a structure that the upstream is wider than the downstream, thus waste gas flows can be contacted with the adsorbent and a catalytic agent more sufficiently; and during the warming-up process through the cold boot, a flow velocity sensor 7 as well as a concentration sensor 8 and a concentration sensor 9 at the upstream side and the downstream side of a throttling valve are used for transmitting signals to a control unit 6, thus the opening and closing degrees of a control valve 4 and the throttling valve 5 can be changed properly, thereby controlling the absorption and purification processes of the HCs.

Description

technical field [0001] The invention belongs to the field of gasoline engine emission pollution control, in particular to an emission control system for purifying HC contained in exhaust gas of gasoline locomotives. Background technique [0002] When the gasoline engine is in the cold start stage, its throttle opening is small, the vacuum degree of the intake pipe is high, and the intake flow rate and temperature are very low, resulting in poor atomization of gasoline, poor evaporation, and difficulty in forming a uniform combustible mixture with air. On the other hand, the concentration of residual exhaust gas in the cylinder is high, the temperature of the combustion chamber is low, the combustion of the engine is unstable, and abnormal combustion phenomena such as misfire are prone to occur, resulting in the formation of a large amount of unburned hydrocarbons. Studies have shown that 70% to 90% of HC emitted during cold start comes from 200s after cold start. [0003] G...

Claims

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Application Information

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IPC IPC(8): F01N3/28F01N9/00
CPCY02T10/22Y02T10/47Y02T10/12Y02T10/40
Inventor 邓元望刘腾鄂加强韩卫朱浩曾谊晖
Owner HUNAN UNIV
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