Product

Coal Water Slurry (CWS) is a fuel composed of fine coal particles suspended in water, typically containing 60–70% coal by weight and 30–40% water. This pumpable, stable mixture is used as a cleaner alternative to traditional coal combustion, mainly for power generation, industrial boilers, and gasification processes. The water content makes CWS explosion-proof and reduces harmful emissions, while additives may be included to improve stability and flow properties. CWS is produced by crushing and wet milling coal to a fine particle size, then homogenizing it with water and additives to achieve the desired viscosity and energy content.

Characteristics

A coal-water slurry fuel is defined by a number of factors including its viscosity, particle size, rate of sedimentation, ignition temperature (800–850 °C [1,470–1,560 °F]), combustion temperature (950–1,150 °C [1,740–2,100 °F]), ash content and calorific value (3,700–4,700 kilocalories per kilogram [15.5–19.7 MJ/kg]).

When coal-water slurry fuel combusts, over ninety-nine percent of its carbon content is consumed. Ash content of less than ten percent is desirable for boilers. For diesel engines, there is no limit.

References

1. Wikipedia, Coal-water slurry fuel.
2. Romiter Group, Coal Water Slurry Fuel (CWSF) Steam Boiler-Fluidization Suspension Type.
3. openPR, 22nd Apr 2025, Coal Water Slurry Market Next Big Thing | Major Giants Enersol, Clean Slurry Technology.
4. EXTRAPOLATE, Jun 2022, Global Coal Water Slurry Market Research Report 2022 (Status and Outlook).
5. Liu X, Wang S, Liu N, Wei B, An T. Progress of Dispersants for Coal Water Slurry. Molecules. 2023 Nov 21;28(23):7683. doi: 10.3390/molecules28237683. PMID: 38067414; PMCID: PMC10707763.