coke

Traductions

• anglais

  Date : 1990

  Définition

  A porus, grey product resulting from the dry distillation of bituminous coal, petroleum or coal tar pitch which drives off most of the volatile matter.
  
  Solid fuel obtained from coal by heating in the absence of air.

  Notes :

  It has a calorific value of 270 therms/tonne (28.5 GJ/tonne).
  
  Coke is employed primarily within the metallurgical industries where it performs the dual function of providing heat and acting as a reducing agent. For this purpose coke must be reactive, contain little ash or sulphur and be capable of withstanding the high pressures inside blast-furnaces. In a blast-furnace coke does not pack under pressure into an impervious mass, ie it allows air to pass through and supports the combustion and reduction of the ore. Industrial users also burn coke as one means of providing heat energy both for carrying out manufacturing processes and for space heating. Such coke need not meet such strict specifications as coke for the metallurgical industries. In particular it does not have to be so hard. Although coke does not ignite as readily as coal it is finding an expanding domestic market as a result of the continuing introduction of smokeless zones. Water gas and producer gas are both manufactured from coke.
  
  Coal-derived coke is used chiefly for blast-furnace fuel, the coal producing about 1400 pounds of coke perton; it is about 90% carbon. Petroleum-derived coke (also called metallurgical coke) is used to make electrolytic and electrothermic electrodes and also as refractory electrothermal furnace linings. It is somewhat purer, running about 95% carbon. Coke is generally regarded as a form of industrial carbon.

  Terme :

  1. coke