Focus on heavy equipment
Focus on heavy equipment
Freshly mined coal from coal mines has high moisture content, low calorific value, and it will produce a lot of smoke and harmful gases during combustion, increase transportation costs. Coal dryers can effectively solve these problems. The most common type of coal dryer is the rotary dryer, it adopts a hot air drying process, coupled with a PLC intelligent control system, to precisely adjust the drying parameters, so that the coal is heated evenly in the drum, the moisture evaporates quickly, and the moisture content is reduced to the target value.
The coal dryer consists of a heat source, an inlet and outlet system, a drum, a dust removal system, an electronic control system, etc. The heat source for the coal dryer can be widely selected from various common energy sources such as coal, diesel, natural gas, steam, biomass, etc. According to local environmental protection requirements, the dust removal system can be equipped with a two-stage or three-stage dust removal system including cyclone dust removal, bag dust removal, and wet dust removal. The main body of the drum of the coal dryer is an inclined cylinder with a length of 10-20 meters, and different sizes of cylinders correspond to different processing capacities.
The coal dryer achieves the purpose of drying by exchanging heat between the hot air generated by the hot-blast stove and the moisture in the wet coal. Wet coal enters the drum from the feed inlet and comes into contact with the high-temperature airflow inside. The drum is equipped with lifting plates to ensure that the coal is heated evenly inside the drum, making moisture to evaporate. An integrated intelligent temperature control system automatically senses and adjusts the temperature to ensure uniform drying. The dried coal is discharged from the drum. The dried exhaust gas is purified by the dust removal system and then discharged into the atmosphere, avoiding environmental pollution.
Coal dryer can be used to various forms of coal, such as raw coal, anthracite, lignite, coal slime, and clean coal. We can customize coal drying solutions for 300-3000 tons per day.
This is the most important function of coal dryer. Wet coal has a high moisture content, when burning, the evaporation of moisture will take away some of the heat, so its calorific value is low. After dried, the moisture content in coal is low, so its calorific value is high. This makes coal release more heat during combustion, reducing energy waste.
High-moisture coal may produce more smoke and harmful gases during combustion, this will pollute environment. Dried coal burns more cleanly, with less dust, more environmentally friendly.
During the transportation of coal, high moisture content increases the weight and cost of transportation. By reducing the moisture content through drying, transportation costs can be saved.
Uneven drying may be caused by wear on the lifting plate or uneven distribution of hot air. Regularly inspecting the internal structure of the equipment, adjusting the hot air flow, or repairing damaged parts can effectively prevent this from happening.
We can install a heat recovery system to recover some of the waste heat from the exhaust gas, or a more efficient hot air furnace can be used instead.
Install dust removal system such as cyclone separators or bag filters, and ensure that the equipment is well sealed.
Regular maintenance such as check the lubrication of lip-moving parts such as bearings and gears daily, clean ash deposits in the hot air furnace, and remove residues from the drum to prevent corrosion during downtime.
The coal dryer is a key equipment for improving coal quality. We should choose the suitable model according to specific needs, and pay attention to maintenance during use in order to prolong the service life of the equipment. Zhengzhou Jiutian is a leading manufacturer in the field of coal drying, with more than 1000 projects all over the world. If you want to learn more about coal dryers, please feel free to contact us.
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