- Q: What’s the meaning of GJ? What’s the calorific value of wood pellets?
A: GJ is international heat unit. The basic unit is J (joules). There are also extension unit including MJ and GJ.
1 kcal = 1000 cal= 4186.8 J = 4.1868 KJ
1000 kcal = 4.1868 MJ, 10000 kcal = 41.868 MJ
1GJ is the equivalent of the calorific value of burning 55.55kg, 4300 kcal coal. (4300 kcal/kg coal also means 18MJ/kg )
The calorific value of several fuels
- Gas: 8600 kcal/m3, the equivalent of 36 MJ/m3
- Liquefied petroleum gas: 11000 kcal/kg, the equivalent of 46 MJ/kg
- Automotive diesel fuel: 12000 kcal/kg, the equivalent of 50.24 MJ/kg
- Motor gasoline: 10800 kcal/kg, the equivalent of 45.22 MJ/kg
- Wood pellets: 4300 kcal/kg, the equivalent of 18 MJ/kg
- Straw pellets: 3700 kcal/kg, the equivalent of 15.49 MJ/kg
Making wood pellets for high-combustion value fuel with wood pellet making machine projects in The Czech Republic, Guatemala, South Korea, Japan, Thailand, Indonesia, etc., at low cost by wood pellet making equipment manufacturer or supplier at factory price. Contact us for more information about maximizing the calorific value of wood pellets. (Related article: wood pellet business>>)
How to Maximize the Calorific Value of Wood Pellets?
Although the calorific value of wood pellets is higher than that of ordinary fuels, improper combustion methods cannot maximize the effect of wood pellets as fuel. Through a series of experiments, we have come up with some conditions under which wood pellets can be burned completely. (Read more: sawdust pellet machine for sale>>)
- High Enough Temperature
A high enough temperature to ensure the heat needed for ignition, and to ensure effective burning speed. The ignition point of wood pellet fuel is about 250℃, and its temperature is increased with a good supply of subsequent fuel for combustion. The heat gradually accumulates during the ignition process, so that more fuel is involved in the reaction and the temperature rises, and when the temperature reaches 800℃ or more, the biomass can burn well.
- Proper Amount of Air
The effect of air on the calorific value of wood chips is mainly reflected in two aspects：
- If the amount of air is too little, the combustible components can not be fully burned, resulting in incomplete combustion losses;
- If the amount of air is too much, it will reduce the temperature of the combustion chamber, affecting the degree of complete combustion. In addition to causing a large amount of flue gas, reducing the thermal efficiency of the boiler.
- Adequate Combustion Time
Fuel combustion has a certain speed to reach the maximum degree of combustion, so does the wood pellets. In order to make complete combustion with high calorific value, the biggest combustion adjustment is to try to keep the combustion in the furnace residence time to make the wood pellet burn completely. (Learn more: biomass pellet machine price>>)
- The Timely Mixing of Oxygen
Primary wind enough to blow and penetrate the stirred fuel; secondary wind strong and fast into the most intense combustion in the combustion center can not lack oxygen in the upper combustion zone of the furnace, to maintain sufficient oxygen. A blower can be connected to supplement the oxygen to increase the calorific value of wood pellets.
When the above points are met, the calorific value of wood pellets is played to the extreme. There will be no burning, slag, coking, flameout, heat can not keep up with the problem.
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