104 



THE PRODUCTION AND USE OF HEAT 



extent in country homes for cooking. Gas stoves for burning 

 acetylene require a special burner so that the acetylene flame 

 will not smoke. 



119. Producer Gas. A gas that has come into extensive 

 use of late as a fuel for gas engines and for certain kinds of 

 heating is called PRODUCER GAS. Large quantities of producer 

 gas are used in making steel and in making glass. In both 

 of these cases it is used to produce heat in the furnace. The 



Hot? 



FIG. 82. Producer gas plant. 



principle employed in making producer gas is that of the in- 

 complete combustion of carbon. The resulting carbon 

 monoxide is then used as a fuel when it burns to carbon di- 

 oxide. When carbon burns to carbon monoxide, about 30.6 

 per cent, of the heat energy of the carbon is liberated, the re- 

 maining 69.4 per cent, being liberated when the resulting 

 carbon monoxide is burned to carbon dioxide. The fuel (coal 

 is usually used) is placed in the producer (Fig. 82). A 



