Product

Main Product: Coal
Segment: Extractive Industry Products
Main-Family: Fossil Hydrocarbons
Sub-Family: Solid Feedstock
Physical State: Solid

Product

Coal Water Slurry

Abbreviation

CWS

Names

Coal Water Slurry Fuel

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.

Parameters	І GRADE	ІІ GRADE	ІІІ GRADE
Coal content, %	≥ 65	63–65	60–63
Viscosity^{[clarification needed]}	≤ 1200
Minimum energy yield (kcal/kg)	≥ 4700	4420–4660	4000–4420
Ash content, %	≤ 6	6–8	8–10
Sulfur content, %	≤ 0.35	0.35–0.65	0.65–0.80
Ash softening temperature^{[clarification needed]}	≤ 1250
Particles of more than 300 μm, %	≤ 0.05	0.05–0.20	0.20–0.80#
Particles up to 75 μm, %	≥ 75.0
Volatile content, %	> 30	20–30	≤ 20