Suction gas plants . years. Do not mistakeme. There are, of course, pressure producer gas plants, and youare possibly so familiar with Mr Dowsons name, that you willimagine he has been making these suction gas plants for amuch longer time than has actually been the case. He was fora long time, and still is, associated with the manufacture ofpressure plants. Eeactions of Gas Producer.—It is now necessary to give abrief outline of the chemical actions which take place within theproducer. It is a well-known fact that when air is passed overred-hot carbon, in quantity, we obtain the combustible ga
Suction gas plants . years. Do not mistakeme. There are, of course, pressure producer gas plants, and youare possibly so familiar with Mr Dowsons name, that you willimagine he has been making these suction gas plants for amuch longer time than has actually been the case. He was fora long time, and still is, associated with the manufacture ofpressure plants. Eeactions of Gas Producer.—It is now necessary to give abrief outline of the chemical actions which take place within theproducer. It is a well-known fact that when air is passed overred-hot carbon, in quantity, we obtain the combustible gas carbonmonoxide (CO). In reality, the oxygen of the air first combineswith the carbon to form carbon dioxide (COg), but this, on passingover more of the red-hot fuel, is reduced to carbon monoxide (CO).This action is an exothermic one : that is, heat is given out to theextent of 8900 for every pound of carbon consumed. Thenitrogen of the air, of course, remains unchanged and dilutes the INTRODUCTORY o *3 o g TO o o 1-1 8 SUCTION GAS PLANTS. gas, thus lowering its calorific value. The air gas thusobtained would have a heating value of something like 120 cubic foot. Since heat is being given out at the rate of 8900 forevery pound of carbon consumed, the temperature of a producerworking on air blast alone would be very high, and seriouspractical difficulties would thus be introduced. To avoid these,the usual practice is to add to the air a certain quantity of steam. Now, steam reacts with carbon (or coal) on its own account, inthe following way :— H20 + C = H2 + CO, the products of the reaction being carbon monoxide and of these gases are combustible, and so the calorific value ofwater gas is high, being about 350 per cubic action itself, moreover, is endothermic: that is, it absorbsheat to the extent of 4366 for every pound of coal , of course, has the desired eifeot of reducing the temperatureof
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