A sludge burner is placed in the incinerator to burn and dispose of sewage, sludge, and waste oil. An auxiliary oil burner is also fitted to ignite the refuse. Automatic controls provided for the system secure the igniter when the refuse starts burning without the need for the igniter.
Combustion air is supplied with the help of a forced draught fan. A loading door, pneumatically operated, is provided to load the refuse. An interlock is also provided with a burner and forced draught fan, which trips when the loading door is in an open condition as part of the safety.
Solid waste is fed from the loading door, and the incineration process starts after closing the door. Liquid waste is fed through the waste oil burner into the system when the refractory of the incinerator becomes hot. After the completion of the incineration process, the incinerator is allowed to cool down, and residue like ash and the non-combustibles are removed by pulling the ash slide door. The rotating arm in the verticle cyclone type scrapes off the entire solid residue in the ash box which can be easily disposed of.
During incineration, it is important to control the exhaust temperature, which should not be very high or too low. The high temperature could lead to the melting of metal and can cause damage to the machinery, whereas too low a temperature will not be able to burn the residue and sterilize and remove odour from the residue.
This temperature control can be achieved by introducing cold-diluted air into the exhaust stream at a point which is as close to the incinerator discharge.