One coal boiler efficiency depends its brand, burner, auxiliaries, installation, operator, fuel, etc. There are two method to measure the boiler efficiency, direct method and indirect method.
A. Direct method
Boiler efficiency =Q*(Hg-Hf)/q*GCV *100 Q =Total steam flow Hg= Enthalpy of saturated steam in k cal/kg Hf =Enthalpy of feed water in kcal/kg q= quantity of fuel use in kg/hr GCV =gross calorific value in Kcal/kg.
B. Indirect method
We need a following parameter like :1.Ultimate analysis of fuel ; 2.percentage of O2 or CO2 at flue gas; 3.flue gas temperature at outlet; 4.temperature and humidity of air; 5.GCV of flue in Kcal/kg; 6.ash percentage in combustible fue; 7.GCV of ash in Kcal/kg.
A coal-fired steam boiler is a steam-fired boiler that burns coal. It refers to a power equipment that burns coal in a furnace to release heat, heat the water, and produce steam with a certain temperature (and pressure). Generally speaking, a coal-fired steam boiler is a device that absorbs the heat energy of coal combustion and turns the water into a certain parameter (such as pressure, temperature, etc.) steam. The boiler is divided into two parts: a pot and a furnace. The pot is a metal container for loading water. The furnace is a part of fuel combustion, and the water in the pot absorbs the heat of combustion of the fuel in the furnace and is converted into steam.
Coal boilers are commonly used to heat water and create steam for energy production. Coal-fired boiler efficiency can often provide lower operating costs in comparison to other fossil fuels almost 75% less than oil or natural gas. Coal, when properly handled and combusted, is one of the cleanest fossil fuels available today.
Coal fired steam boiler are three pass fully wet with internal furnace ash drop at the rear side of furnace to remove the ash. Capacity 300 kgs/hr to 6,000 kgs/hr. 3 TPH above will have double integral furnace for more grate area better combustion of fuel.
Zozen Boilers recommended when choosing purchasing boiler, to visit manufacturers, product performance comparison, choose the appropriate boiler products. All the coal-fired steam boilers produced by our factory adopt suitable high temperature resistant grate to provide reliability for the use of grate, so as to ensure the safe production of the boiler. Our coal-fired steam boilers have been sold to more than 100 countries and regions all over the world, with rich production experience. After continuous upgrading and improvement, we have reached the standards of energy conservation and environmental protection, with low emission of soot and dust, and have been highly praised by customers.