KR940009495A

KR940009495A - Engine exhaust system

Info

Publication number: KR940009495A
Application number: KR1019920019970A
Authority: KR
Inventors: 폴 데이 존; 어빙 프로스트 로드니; 모리스 래치맨 어윈; 다이아마나고우다 파틸 말라나고우다; 스탠리 소싸 2세 루이스
Original assignee: 알프레드 엘. 미첼슨; 코닝 인코오포레이티드
Priority date: 1992-10-28
Filing date: 1992-10-28
Publication date: 1994-05-20

Abstract

본 발명은 엔진을 가동하는 동안에 대기에 방출되는 탄화수소의 양을 실질적으로 감소시킬 수 있는 엔진 배기시스템에 관한 것이다. 상기 시스템은 촉매전환장치가 효과적으로 작동하는 온도에 도달하기 전, 즉, 엔진을 가동하는 동안에 방출된 탄화수소를 흡착할 수 있는 고급-실리카 제올라이트와 같은 분자체 수단을 활용한다. 상기 시스템은 상기 촉매 변환장치가 효과적으로 작동하는 온도에 도달하는 즉시, 상기 탄화수소가 분자체 수단으로부터 탈착되고 비독성 물질로 전환하기 위하여 상기 변환장치로 이동되도록 설계되었다.The present invention relates to an engine exhaust system that can substantially reduce the amount of hydrocarbons released to the atmosphere while the engine is running. The system utilizes molecular sieve means such as higher-silica zeolites that can adsorb hydrocarbons released before the catalytic converter reaches the temperature at which it will operate effectively, ie, while the engine is running. The system is designed such that as soon as the catalytic converter reaches the temperature at which it is effectively operated, the hydrocarbon is desorbed from the molecular sieve means and transferred to the converter for conversion to non-toxic material.

Description

Engine exhaust system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 연교환기를 사용하는 본 발명의 엔진 배기 시스템의 개략도이다.1 is a schematic diagram of an engine exhaust system of the present invention using a flue exchanger.

제2a도는 본 발명의 제올라이트-함유 수단의 시험을 도시한 개략도이다.Figure 2a is a schematic diagram showing the test of the zeolite-containing means of the present invention.

제2b도는 제2a도의 시험에 따라 엔진 가동후 시간 함수에 따라 제올라이트-함유 수단을 통과하는 엔진 배기흐름의 탄화수소 함량을 나타낸 그래프로, 실선은 탐침 1이고, 일점쇄선은 탐침 2이다.FIG. 2b is a graph showing the hydrocarbon content of the engine exhaust flow through the zeolite-containing means as a function of time after engine operation according to the test of FIG. 2a, with the solid line being probe 1 and the dashed line being probe 2. FIG.

Claims

Molecular sieve means for adsorbing hydrocarbons and desorbing as soon as the desorption temperature is reached, adsorbing hydrocarbons from the engine exhaust stream during the passage of the exhaust gas; having a light-off temperature, the engine Main catalytic converter means located downstream of said molecular sieve means for substantially converting hydrocarbons into water and carbon monoxide in the exhaust stream; And heat exchanger means for cooling the engine exhaust gas stream before exhaust gas passes through the molecular sieve means and reheating the flow before the exhaust gas passes through the diverter means. An engine exhaust system, characterized by substantially converting water and carbon monoxide.

2. An engine exhaust system according to claim 1, wherein the heat exchanger means is a counter-flow heat exchanger having a cooling fluid inlet and a hot fluid inlet.

2. An engine exhaust system according to claim 1, wherein said molecular sieve means consists of zeolat.

2. An engine exhaust system according to claim 1, wherein said molecular sieve means consists of higher silica zeolite.

5. The method of claim 4, wherein the higher silica zeolite is selected from the group consisting of silicalite, ZSM-5, ZSM-8, ZSM-11, ZSM-12, Haifa Y, superstable Y, beta, mordenite and erionite. Selected engine exhaust system.

2. An engine exhaust system according to claim 1, wherein said ceramic substrate is comprised of honeycomb structures.

7. An engine exhaust system according to claim 6, wherein said honeycomb structure consists of zeolite-embedded or coated molecular sieve means.

7. An engine exhaust system according to claim 6, wherein said honeycomb structure consists of zeolites knotted on the surface of a ceramic substrate.

2. An engine exhaust system according to claim 1, wherein said main catalytic converter means additionally converts carbon monoxide and NOx into non-toxic materials.

※ Note: The disclosure is based on the initial application.