How to calculate the energy consumption of calcination in a new type of lime kiln
The calcination energy consumption of lime kiln is an important economic indicator in the lime production process, and its calculation involves multiple factors and links. With the advancement of technology, new lime kilns have achieved significant improvements in energy consumption, and the calcination energy consumption of new lime kilns is also continuously decreasing.
The calculation of calcination energy consumption for a new type of lime kiln first considers the consumption of limestone and fuel. The main components of limestone include calcium carbonate and a small amount of magnesium carbonate, which will decompose and produce carbon dioxide during the calcination process, so it cannot be calculated based on the actual weight of the stone material. Generally speaking, the loss on ignition of limestone is between 38% and 41%. Based on this, it can be calculated that producing one ton of lime requires the consumption of 1.61-1.69 tons of limestone. For safety reasons, the cost is usually calculated based on a maximum of 1.8 tons.
The consumption of fuel is closely related to the kiln type, equipment selection, and calcination process of the lime kiln. Traditional lime kilns have relatively high fuel consumption due to significant heat loss. The new lime kiln significantly reduces energy consumption by adopting advanced energy-saving technologies and equipment. For example, the coal consumption of some new lime kilns has been reduced to 120-130 kilograms of standard coal per ton of lime, or even lower. If clean energy sources such as natural gas and biomass are used, it can further improve fuel utilization efficiency and reduce carbon emissions.
When calculating the calcination energy consumption, it is also necessary to consider the heat required for limestone calcination. This can be calculated using the formula 'required heat for limestone calcination=calorific value of limestone calcination x amount of limestone calcination'. Among them, the calorific value of limestone calcination refers to the heat released per unit mass of limestone during the calcination process, usually measured in kilojoules per kilogram (kJ/kg) or kilocalories per kilogram (kcal/kg); The calcination amount of limestone refers to the quality of limestone used in the production process, usually measured in tons (t).
The new lime kiln has also achieved higher energy efficiency by optimizing the calcination process and equipment. For example, some advanced lime kilns adopt the technology of graded feeding of raw materials into the furnace, which solves the problem of uneven particle size of raw materials and expands the adaptability range of raw materials. In terms of energy consumption, the dual waste heat recovery technology greatly recovers the heat in the exhaust gas, further reducing energy consumption.
The calculation of calcination energy consumption for new lime kilns involves multiple factors, including the consumption of limestone and fuel, the heat required for limestone calcination, and the optimization of calcination processes and equipment. By comprehensively considering these factors, the calcination energy consumption of the new lime kiln can be calculated, providing a basis for energy consumption in the lime production process, thereby achieving the goals of energy conservation, emission reduction, and improving production efficiency.
