As an important energy resource, the calculation of coal heat is of great significance to the energy industry and coal utilization.
The heat of coal is usually measured in kilocalories (kcal). So, how do we calculate the heat of coal?The following Hebi Huanuo coal inspection instrument will introduce the calculation formula of the calorific value of coal.
A unit of calorific energy in coal
The calorific value of coal refers to the amount of heat released per unit mass of coal when it is completely burned, and is usually expressed in kcal kg.
The calorific energy directly affects the combustion efficiency and energy utilization efficiency of coal. Different types and grades of coal have different calorific values, depending on their coal quality characteristics and combustion performance, in general, bituminous coal has a higher calorific value, about 5500-7500 kcal, while lignite has a relatively low calorific value, about 3000-5000 kcal.
Calorific unit: joules gram (j g);megajoules kilogram (mj kg);Kilocalorie kilogram (kcal kg) kcal = kilocalorie.
The usual calorific unit card in our country;1 card = 41816 joules, 1 kcal = 00041816 megajoules.
Formula for calorific value of coal
1. The formula for calorific value of coal is: qgr, ad=qb, ad-95sb, ad-aqb, ad
where: qgr - analyze the high calorific value of coal samples, j g;
qb,ad - the calorific value of the cartridge for the analysis of coal samples, j g
sb,ad – the sulfur content of the coal as measured by the cartridge wash, %
95 - 0. per 1% in coal01 g of correction for sulfur, j g
a - nitric acid correction factor.
2. The formula for calorific value of coal at low level is: qnet, ad=qgr, ad-0206had-0.023mad
qnet,ad——analysis of low-level calorific value of coal samples,j g;
qgr,ad——analysis of high calorific value of coal samples,j g;
had——Analyze the hydrogen content of coal samples, %;
MAD – Analyze the moisture of the coal sample, %
Coal heat quantification instrument
In order to calculate the heat of coal more accurately, we need to know the calorific value of coal. The calorific value of coal can be obtained by testing the coal calorimeter (calorimeter). According to the input sulfur, hydrogen, total moisture, and analytical water volume calorimeter, the calorimeter can automatically calculate the high calorific value, low calorific value and received base low calorific value of coal.
Commonly used coal calorific value testers are:
ZDHW-9000F(L) high-precision microcomputer automatic calorimeter (with heating and refrigeration device).
ZDHW-9000C high-precision microcomputer automatic refrigeration calorimeter.
ZDHW-8000A high-precision microcomputer automatic calorimeter.
ZDHW-7000F high-precision liquid crystal automatic calorimeter.
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