How to prevent and treat the most common coking/slagging problems during the operation of solid waste incineration furnaces?

Prevention and treatment of coking/slagging in solid waste incineration furnaces

1. Raw material proportioning and pretreatment

Reasonably arrange the waste proportion to reduce the proportion of high-salt or low-melting point components; for waste with high salt content, it can be mixed with high-melting point materials such as lime to increase the overall melting point and inhibit the deposition of salts in the furnace.
Before feeding, perform uniform mixing and layered stacking to avoid local slagging caused by local salt-rich areas.

2. Combustion temperature and air volume control

Maintain the key temperature of the furnace at 850-950℃ to ensure complete decomposition of organic matter and prevent low-temperature coking.
Dynamically adjust the primary and secondary air volume according to the calorific value of the waste to prevent excessive air volume from causing fly ash to carry coking, or insufficient air volume leading to oxygen-deficient combustion and the formation of a reducing atmosphere.

3. Use of coking inhibitors

Use high-melting point metal oxide-based coking inhibitors (such as CLEANS-307), added at a ratio of 3-8 kg/ton of waste, which can form eutectic crystals with low-melting point salts, increasing the melting point and significantly reducing the coking rate.

4. Regular cleaning and maintenance

Periodically clean key parts such as thermocouples and temperature measurement points to prevent ash and slag buildup from affecting temperature measurement accuracy.
Use mechanical or high-pressure water jets to remove the formed slag layer, and adjust combustion parameters in a timely manner based on on-site monitoring data to avoid slag accumulation leading to increased heat load.