Today we will give a detailed explanation to the question of how much heat energy is consumed to dry 1 ton of materials with a sand dryer, and we hope this will be helpful for friends who intend to invest in sand dryer equipment.
Assuming the moisture content of sand is 10%, the water content in 1 ton of sand is 100 kg.
The vaporization of water at normal temperature and pressure consists of two stages: Stage 1: Heating water to 100°C; Stage 2: Completely vaporizing the water at 100°C.
At 1 atmospheric pressure, the specific heat capacity of water is approximately 4200 joules per kilogram per degree Celsius (J/(kg·°C)), meaning 4200 joules of heat is required to raise the temperature of 1 kg of water by 1°C. To heat 1 kg of water from 0°C to 100°C, the required heat is 4200×100 = 420 kilojoules (kJ). The latent heat of vaporization of water at 1 atmospheric pressure and 100°C is about 2256 kJ. Therefore, the total heat required to evaporate 1 kg of water is 420 kJ + 2256 kJ = 2676 kJ.
1 kilocalorie (kcal) = 4.18 kJ; thus 2676 kJ = 640 kcal. The heat required to evaporate 100 kg of water is 640×100 = 64,000 kcal.
The calorific value of 1 kg of coal is 6000 kcal, 1 kg of diesel oil is 11,000 kcal, and 1 cubic meter (m³) of natural gas is 8000 kcal.
From this, we can easily calculate the heat source consumption for drying 1 ton of sand with a sand dryer:
- 64,000 ÷ 6000 = 10.67 kg of coal
- 64,000 ÷ 11,000 = 5.81 kg of diesel oil
- 64,000 ÷ 8000 = 8 m³ of natural gas
However, in actual production, heat transfer is not as efficient as theoretical calculation, and a certain amount of heat loss is inevitable during the transfer process. Combining with user feedback, our engineers provide the following practical guidance: To dry 1 ton of sand with a moisture content of around 10% using a sand dryer, the actual consumption of heat sources is:
- 13.9 kg of coal (if coal is used as the heat source)
- 7.6 kg of diesel oil (if diesel oil is used as the heat source)
- 10.4 m³ of natural gas (if natural gas is used as the heat source)