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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 19, Number 3
JKCSEZ 19(3)
June 20, 1975 

Studies on the Combustion of Anthracite (I). Combustion of Carbon Monoxide and the Furface

무연탄 연소에 관한 연구 (제1보). 일산화탄소 연소반응 및 연소장치
Byong Sik Shin, Sei Kun Shin

신병식, 신세건
연탄을 연소시킬 때 흙통중에서 일정량의 연탄을 일정시간 연소를 지속시키기 위하여 공기의 공급을 제안하게 되므로 많은 양의 일산화탄소가 방생한다. 그러므로 일산화탄소의 발생을 억제하는 기본실험으로 질소, 산소 및 일산화탄소의 혼합가스 및 탄소의 존재하에서 일산화탄소의 연소율을 측정한 결과 일산화탄소 연소온도는 700℃이상이고 공기의 공급이 증가 할수록 일산화탄소의 연소율이 개선됨을 알았다. 이러한 사실에서 연소시간의 연장과 일산화탄소의 발생 억제는 서로 상반되므로 두 가지 조건을 만족시키는, 보다 효과적 연소장치를 고안하였다. 즉 내경이 다른 이중철통으로 난로를 만들어 약간의 이차공기가 에어자켓 하부에서 들어가 상부의 작은 구멍에서 나오게끔 하면 연소중인 연탄과 열교환되어 연소분위기의 온도는 저하된다. 따라서 연소시간은 길어지면 또 이중철통을 통하여 상승하는 예열공기는 일산화탄소의 제연소를 촉진시키게 되므로 일산화탄소의 발생양은 흙통을 사용하였을때 보다도 1/20 정도로 감소하였다.

In the course of anthracite briquet combustion, air draft is usually controlled to continue burning of definite amount of briquet in the conventional hollow clay cylinder with air inlet hole open for given time, so that a large amount of CO tends to be produced. Therefore, it is necessary to establish an improved combustion process to depress the yielding rate of CO and for this purpose, we performed a basic experiment in which combustion rate of CO was measured in the mixture of N2, O2 and CO gas with or without the presence charcoal at the various temperature. The observed results showed that the burning temperature of CO is about 680∼700℃, further burning rate of it was increased with increasing the amount of draft. From these facts, longer combustion time and low CO generation are thus contradictory to each other and it has been long desired to make those two compatible somehow. The purpose of the present investigation lies in designing an effective new briquet stove to meet the above requirements. The essential feature of the new briquet stove consisted in the use of two hollow iron cylinders with different inside diameter. A cylindrical air jacket thus formed served as a path through which small amount of secondary air run from the bottom of the stove to the upper vent holes. Heat exchange occurred between the upgoing secondary air and the burning briquet, which lowered the combustion temperature of the briquet. The results observed were selfevident as anticipated. It was confirmed that the combustion time was increased tolerably due to the heat loss from the combustion zone and that CO in the flue gas was reoxidized at the upper portion of the stove by the upgoing hot secondary air. By this reoxidation reaction the concentration of CO in the flue gas was found to be about 1/20 of that in case the conventional clay cylinder was used as briquet jacket.

186 - 192
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