KR102575182B1 - 연료 개질기의 연료 분사 제어 방법 및 연료 개질 시스템 - Google Patents
연료 개질기의 연료 분사 제어 방법 및 연료 개질 시스템 Download PDFInfo
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Abstract
Description
도 2는 본 발명의 일 실시예에 따른 연료 개질 시스템을 개략적으로 나타낸 도면이다.
도 3은 본 발명의 일 실시예에 따른 연료 개질 시스템에서 EGR율에 따른 최적 SCR값을 설정하기 위한 일 예를 나타낸 그래프이다.
5: 흡기라인 6: 압축기
7: 터빈 8: 인터쿨러
9: 스로틀밸브 10: 엔진
15: 배기라인 16: 여열 제어밸브
17: EGR 라인 18: 우회 EGR 라인
19: 수소 센서 20: 연료 개질기
22: EGR량 센서 24: 추가 연료 인젝터
25: EGR 쿨러 26: EGR 밸브
30: 촉매 32: 배기압 제어밸브
Claims (17)
- 엔진의 흡기 측으로 유입되는 CO2량을 측정하는 CO2 센서를 통해 EGR(exhaust gas recirculation)율을 측정하는 단계;
상기 측정된 EGR율에 따른 최적 SCR(Steam to Carbon Ratio)값을 설정하는 단계;
상기 측정된 EGR율에 따라 상기 엔진에 공급되는 스팀량을 계산하는 단계;
상기 스팀량과 상기 엔진에 공급되는 연료의 탄소 성분의 비율에 의해 실제 SCR값을 계산하는 단계;
상기 실제 SCR값과 상기 최적 SCR값을 비교하는 단계;
상기 실제 SCR값이 상기 최적 SCR값보다 크면, 상기 실제 SCR값에서 상기 최적 SCR값을 차감하여 SCR 차이값을 계산하는 단계;
상기 SCR 차이값에 따라 추가되어야 할 추가 연료량을 계산하는 단계; 및
상기 계산된 추가 연료량에 따라 연료 개질기에 연료를 분사하는 단계를 포함하고,
상기 추가 연료량은 PI 제어에 의해 계산되며, 하기 수학식 (1)에 의해 계산되는 연료 개질기의 연료 분사 제어 방법.
...................... 수학식 (1)
(여기서, 는 추가 연료량이고, 는 SCR 차이값이고, , 는 이득값이고, t는 시간이다.) - 제 1 항에서,
상기 EGR율은,
상기 엔진의 흡기 측으로 유입되는 EGR 가스 유량과 흡입 공기량의 합 대비, EGR 가스 유량의 비율에 의해 계산되며, 상기 EGR 가스 유량은 상기 CO2 센서를 통해 측정되는 CO2의 농도를 이용하여 측정되는 연료 개질기의 연료 분사 제어 방법. - 제 1 항에서,
상기 최적 SCR값은, 상기 측정된 EGR율에서 최대 수소 변환 효율을 갖는 SCR값으로 실험에 의해 미리 설정된 값인 연료 개질기의 연료 분사 제어 방법. - 제 1 항에서,
상기 엔진에 유입되는 스팀량은 엔진 연료 소모량에 상기 측정된 EGR율을 곱하여 계산되는 연료 개질기의 연료 분사 제어 방법. - 삭제
- 제 1 항에서,
상기 실제 SCR값과 상기 최적 SCR값을 비교하는 단계 이후에,
상기 실제 SCR값이 상기 최적 SCR값보다 크지 않으면, SCR 차이값을 계산하지 않고 종료하는 단계를 더 포함하는 연료 개질기의 연료 분사 제어 방법. - 개질가스를 연소시켜서 기계적인 동력을 발생시키는 엔진;
상기 엔진과 연결되며 상기 엔진으로 개질가스 및 공기를 공급하는 흡기라인;
상기 엔진과 연결되며 상기 엔진에서 배출되는 배기가스를 유통시키는 배기라인;
상기 흡기라인의 전단에 설치되고 개질가스에 함유된 CO2량을 측정하는 CO2 센서;
상기 배기라인으로부터 분기되는 배기가스 재순환(EGR) 라인에 구비되며, 내부로 추가 연료를 분사하는 추가 연료 인젝터가 설치되며, 상기 배기가스가 상기 EGR 라인으로 분기되어 흐르는 EGR 가스를 연료와 혼합시키고, 상기 EGR 가스에 혼합된 연료를 개질시켜 개질가스로 변환시키는 연료 개질기; 및
상기 CO2 센서를 통해 측정된 EGR율에 따라 상기 엔진에 공급되는 스팀량을 계산하고, 상기 스팀량과 상기 엔진에 공급되는 연료의 탄소 성분의 비율에 의해 실제 SCR값을 계산하고, 상기 실제 SCR값과 상기 측정된 EGR율에 따른 최적 SCR값의 차이값에 따라 상기 연료 개질기에 분사하는 추가 연료량을 계산하는 제어부를 포함하고,
상기 추가 연료량은 PI 제어에 의해 계산되며, 하기 수학식 (1)에 의해 계산되는 연료 개질 시스템.
...................... 수학식 (1)
(여기서, 는 추가 연료량이고, 는 SCR 차이값이고, , 는 이득값이고, t는 시간이다.) - 제 7 항에서,
상기 흡기라인에 연결 설치되고 상기 개질가스 및 공기를 압축시켜 상기 엔진으로 공급하는 압축기; 및
상기 배기라인에 연결 설치되어 상기 배기가스에 의하여 회전되어 동력을 발생시키는 터빈을 더 포함하는 연료 개질 시스템. - 제 7 항에서,
상기 연료 개질기 전단의 배기라인에 배치되며, 배기가스에 포함된 질소산화물을 정화시키는 촉매를 더 포함하는 연료 개질 시스템. - 제 9 항에서,
상기 촉매는 연한(lean) 분위기에서 배기가스에 포함된 질소산화물을 흡장하고, 농후한(rich) 분위기에서 흡장된 질소산화물을 탈착하며 배기가스에 포함된 질소산화물 또는 탈착된 질소산화물을 환원시키는 질소산화물 흡장 촉매(Lean NOx Trap; LNT)를 포함하는 연료 개질 시스템. - 제 9 항에서,
상기 촉매는 환원제를 이용하여 배기가스에 포함된 질소산화물을 환원시키는 선택적환원촉매(Selective Catalytic Reducer)를 포함하는 연료 개질 시스템. - 제 7 항에서,
상기 EGR 라인에는,
개질가스의 유량을 조절하는 EGR 밸브, 및
상기 EGR 밸브 후단에 구비되어 개질가스를 냉각시키는 EGR 쿨러가 설치되는 연료 개질 시스템. - 제 12 항에서,
상기 연료 개질기는 상기 EGR 라인의 상기 EGR 쿨러 전방에 설치되는 연료 개질 시스템. - 제 7 항에서,
상기 연료 개질기 후단의 EGR 라인에 구비되며, 상기 연료 개질기의 수소 생성량을 측정하는 수소 센서를 더 포함하는 연료 개질 시스템. - 제 9 항에서,
상기 촉매 후단의 배기라인으로부터 분기되어 상기 연료 개질기로 연결되며 배기가스 및 EGR 가스를 우회시키는 우회 EGR 라인을 더 포함하는 연료 개질 시스템. - 제 15 항에서,
상기 우회 EGR 라인에는 상기 촉매를 통과하는 배기가스와 EGR 가스가 그 온도에 따라 상기 우회 EGR 라인으로 우회하거나 직접 상기 연료 개질기로 유입되도록 개폐되는 여열 제어밸브가 더 구비되는 연료 개질 시스템. - 제 7 항에서,
상기 엔진에는 엔진 연료량을 측정하는 연료량 센서가 더 구비되고, 상기 연료 개질기에는 EGR 가스량을 측정하는 EGR량 센서가 더 구비되는 연료 개질 시스템.
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