A study on the pulsating combustion of coal in a Rijke type combustor

Rijke형 연소기에서 석탄의 맥동연소에 관한 연구

The objective of this study is to investigate on the pulsating combustion of a granular coal in a Rijke type pulse combustor. The combustor is made of a 120cm long pipe with a honeycomb as a fire grate in the lower half. A fixed amount of coal is laid on the honeycomb and burned downward after ignition by using propane gas. Then the combustion driven acoustic oscillation occurs and makes the combustion pulsate with a very high amplitude. The effect of the pulsation and the air flow rate on the combustion characteristics is examined in comparison with the normal combustion. The non-pulsating combustion is made possible by placing absorbing material under the honeycomb. The combustion phenomena are observed visually, the burning time is measured in order to evaluate the combustion rate, and the variation of the gas temperatures is recorded. It is found that the fuel particle is greatly agitated like boiling by the flow pulsation and the burning-down velocity is so fast that the fuel is burned almost simultaneously. The combustion rate can be increased as twice as that of non-pulsating combustion with increase of the air flow rate. And the combustion becomes clean with less soot deposit and emission.

본 연구는 석탄의 맥동연소과정을 비맥동연소와 빅교실험을 하여 연소특성 을 가시적으로 관찰하고 연소율 등의 연소특성을 구하며 고체연료의 맥동연소과정을 밝히고 맥동연소기 개발의 기초자료를 얻는데 목적을 두었다.