A very interesting and new application for a liquid waste incineration system was identified in which MA Residue - residual waste from maleic anhydride C₂H₂(CO)₂O, had to be disposed of by a continuous process.  Why continuous? If the system was stopped midway, the waste in liquid form would solidify within the pipelines, nozzles, etc. and it would take considerable effort to liquify the waste and restart the process.

 

The capacity of the system is 500 kg/h with the MA residue having a calorific value of 4637 kcal/kg and a specially customised burner with a turn down ratio of 1:5. The liquid waste is charged to the chamber through a customised barrel burner.

 

As mentioned, it is continuous feed involving liquid waste pipelines with steam heating and nitrogen purging.

 

Provision for steam heating is through jacketed arrangements with pre-heated steam @ a pressure of 3 bar and a temperature of 215-220℃.

 

The system

is equipped with a fully automatic PLC control panel with 3 control modes viz. manual model, maintenance mode and auto mode.

 

The process of incineration starts with pre-heating upto 950℃, after which the feeding of liquid waste begins.  The system fan operates continuously maintaining a chamber temperature of between 1100℃ and 1200℃ and instruments with interlocks provided.

 

The temperature at the inlet of boiler is maintained at 1150℃ and at this time, steam generation happens at 4160 kg/h.

 

The boiler outlet is connected to a venturi for reducing the temperature and controlling emissions.  The venturi mixes flue gas with water to reduce the temperature.  The venturi is connected to a demister pad for removal of moisture. Cleaned flue gas at 50-80℃ is released to the atmosphere through a chimney.

 

The system has been operational since February 2024 and the performance and emissions are quite good.