How to calculate the coal quality used in power plant boiler
How to make quick estimate of the coal required for running a power plant boiler? ZG as a technical power plant boiler manufacturer take this article describes a simple method.
Very often, the Power engineer is required to perform some basic calculations regarding the key parameters of a power plant boiler. Most important is the quantity and cost of fuel that is required.This article gives the simple calculation method. (A detailed calculation required in the context of a contract, tender, performance report or a legal document may require more accurate input data.)
Energy Content in Coal
The basic function of the power plant is to convert energy in coal to electricity. Therefore, the first thing we should know is how much energy there is in coal. Energy content of coal is given in terms of KiloJoules (kJ) per Kilogram (kg) of coal as the Gross calorific value (GCV) or the Higher Heating value (HHV) of coal. This value can vary from 10500 kJ/kg to 25000 kJ/kg depending on the quality and type of the coal.
You should have an idea of the type of coal, or the source or mine from where the the plant gets the coal. Published data about the sources, mines, regions or the procurement data gives an idea about the HHV of coal. For this example we use a HHV of 20,000 kJ/kg.
Energy conversion takes place in two stages.The first part of the conversion is efficiency of the boiler and combustion. For this example we take 88 % on an HHV basis that is the normal range for a well-optimized power plant boiler.
Second part is the steam cycle efficiency. Modern Rankine cycle, adopted in coal fired power plants, have efficiency that vary from 32 % to 42 %. This depends mainly on the steam parameters. Higher steam pressure and temperatures in the range of 600 ° C and 230 bar have efficiency around 42 %. We assume a value of 38 % for our case.
The overall conversion efficiency then is (38% x 88%) 33.44 %.
Heat rate is the heat input required to produce one unit of electricity. (1 kw hr).One Kw is 3600 kJ/hr. If the energy conversion is 100 % efficient then to produce one unit of electricity we require 3600 kJ. After considering the conversion efficiency in a power plant we require an heat input of (3600 / 33.44% ) 10765 kJ/ kw hr.
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