TS-86
PM Reduction System Using High Frequency Induction Heating
Sachio KUBOTA*, Koji NAGASHIMA**, Hiroyasu KIFUNE**, Yoshihiro HATANAKA**, Yasuzo KAWAMURA HATANAKA*** and Yoshitaka UCHIHORI HATANAKA***
ABSTRACT
Recently, the regulation to the air pollution is required from a viewpoint of environmental issue. The exhaust gas from a diesel engine is one of the factor that the air pollution is caused. PM (Particulate Matter) in exhaust gas attracts a lung cancer and allergy.
In this paper, PM reduction system using high frequency induction heating is proposed, and the high frequency inverter for its power supply is proposed and analyzed. As the results, it is proved that proposed system is effective to reduce PM and that the proposed high frequency inverter has realized stable operation.
Key Words: PM (Particulate Matters), Induction Heating, Inverter, Soft Switching
1. INTRODUCTION
From a viewpoint of environmental issue, the regulation to the air pollution is required in recent years. The exhaust gas from marine diesel engine is one of the factors that the air pollution is caused. In exhaust gas, NOx, SOx, and PM (Particulate Matters) are contained as a poisonous substance. The emission control of diesel engine is currently examined variously. However, it is already known that it is hard to reduce both PM and NOx only by improvement of a diesel engine, because the relation between PM and NOx is relation of trade-off. Authors have taken note of PM (Particulate Matter) in exhaust gas. PM attracts a lung cancer and allergy, and its reduction method must be established as soon as possible. Therefore the combustion system of PM by means of high frequency induction heating have already proposed.(1)(2)(3) This system is called PM reduction system. The power supply of PM reduction system using high frequency induction heating is utilized high frequency inverter. In PM reduction system, the value of load is changed in order to heat PM at high temperature. And a stable operation, in spite of changing load is required in this inverter.
In this paper, high frequency inverter in complex resonance for high frequency induction heating is proposed, and investigated based on numerical analysis. The proposed inverter realizes a stable operation in spite of changing load. Moreover the effects of reduction of PM by PM reduction system are examined by driving marine diesel engine and the experimental results are presented.
2. PM REDUCTION SYSTEM
The constitution of proposed PM reduction system is illustlated in Fig. 1. The metallic filter of induction heating unit is uniformly heated because that filter generates heat by non-contact according to using high frequency induction heating. In Fig. 1, PM in exhaust gas from marine diesel engine is led to the induction heating unit connected to the exhaust pipe, and passes the heated filter at high temperature.
Fig. 1 PM reduction system
