Rule 9 Fuel conversion processes
The discharge of contaminants into air from industrial or trade premises in connection with:
(1) carbonising or gasification process involving natural gas, petroleum, oil shale, coal, wood, or other carbonaceous material, including:
(a) pyrolysis or destructive distillation, regardless of whether the solid, liquid or gaseous products are being recovered; and
(b) gasification by partial combustion with air or oxygen or reaction with steam; and/or
(2) the production of solid fuels produced from waste by use of heat;
is a Discretionary Activity.
Explanation: Rule 9 relates to discharges to air from fuel conversion processes. Rule 9 relates to fuel conversion processes involving both hydrocarbons and non-hydrocarbons.
Rule 9 makes the discharge of contaminants to air from all fuel conversion processes, undertaken on industrial or trade premises, discretionary activities. Carbonisation involves the burning of materials (e.g., the production of charcoal) from wood. Destructive distillation refers to the distillation of solid materials, accompanied by their decomposition. This includes the production of coke from charcoal. Gasification processes introduce reacting gases into a reactor to encourage the formation of gaseous products and/or release heat within the reactor. Gasification reactions usually take place at higher temperatures than required for pyrolysis. For complete gasification, all of the solid is converted to a gas.
Pyrolysis is the process of heating an organic material in the absence of oxygen. No other material is introduced into the reactor system. This process causes large organic molecules to break down, as a result of high temperature, into smaller and more simple molecules. Pyrolysis can be used to produce acetone and methanol from wood. Processes involving the production of solid fuels, such as briquettes, are also discretionary activities and are covered by Rule 23. The production of solid fuels relates to activities such as the manufacture of briquettes from coal, which involves coal dust being compacted at high pressure and heated to form coal bricks.