石炭地下ガス化過程における還元反応について

抄録

An important process in underground gasification of coal is reduction from CO₂ gas to CO. In process of underground gasification of coal, the heat loss to the peripheral rocks is verg great. For that reason, the reducting reaction of CO₂ gas can not occur sufficiently. The author took β(=CO/CO+CO₂) as an index of reduction, and found the relations between β and many other factors.
The author concluded in our laboratory experiments as follows:
(1) It is desirable to get β=1.0 in process of gasification ideally. But it's notpossible in actnall underground gasification, for the heat loss is very great.
(2) In our experiments, when we used the oxygen gas, which quantity is 4l/min, we got the temperature 1300-1400°C at burning zone. In these case, the value of β showed only 0.4. Therefore, we can suppose, the reducing temperature is not so high and about 650°C. This shows how the heat loss is great.
(3) In order to increase the value of β, it's necessary to feed much more quantity of oxygen gas in channel.
(4) When β=0.4, we got the gas, which calorific value was about 1600kcal/Nm³.
(5) On the one side, it's desirable to feed a lot of oxygen gas in channel, but the other side, that is not desirable for the ecconomics of underground gasification of coal.