double inlet and double outlet ball mill for coal grinding

Double inlet and double outlet ball mill not only has the basic functions of traditional grinding, drying, powder selection and powder feeding, but also can operate stably in the direct blowing milling system, which can satisfy the high requirements of modern thermal power plant on the fineness of coal powder and the adaptability of coal type.

Features of double inlet and double outlet ball mill:

1. Multi-functional integration: double inlet and double outlet ball mill not only has the grinding function of traditional coal mill, but also can be simultaneously coal powder drying, powder selecting and powder feeding, forming a closed-loop system, which improves the overall operating efficiency.
2. High efficiency and stability: the equipment can work continuously and stably, the output and coal fineness control is very stable, to meet the strict requirements of thermal power plants for coal fineness and combustion efficiency.
3. Low wind-coal ratio: compared with the traditional coal mill, the double inlet and double outlet ball mill has a lower wind-coal ratio, which not only improves the consistency of pulverized coal, but also reduces the consumption of fuel during the startup of the boiler, which saves the operation cost.
4. Wide adaptability: the equipment has excellent adaptability to a variety of coal types, and performs well for abrasive or hard coal types.
5. Strong resistance to interference with foreign objects: double inlet and double outlet ball mill has a strong adaptability to foreign objects (such as iron, wood, stone, etc.) that may appear in the process of milling, and will not have a serious impact on the operation of the equipment.

Advantages of double inlet and double outlet ball mill:

1. High continuous operation rate and less maintenance: the equipment is reasonably designed, the mill can run for a long time without frequent maintenance, steel balls and other wear parts can be added without stopping, and the liner plate and other components have a long service life, which reduces the maintenance cost.
2. Fast response and strong flexibility: the equipment in the load range of the response speed is very fast, the user can adjust the operating mode according to the actual load requirements, to realize the double in and double out, single in and double out or half mill operation and other modes of operation.
3. Stable fineness and output: the equipment’s low air-to-coal ratio makes the fineness and output of coal powder under stable control, which can reduce the dependence on gas or oil and optimize the use of energy when the boiler is running at low load.
4. High adaptability: strong adaptability to different kinds of coal and foreign materials, ensuring the smooth operation of the equipment in different operating conditions, reducing the need for downtime maintenance.

The working principle of double inlet and double outlet ball mill:

1. The feeding and discharging ports are set at both ends respectively, and through the different internal structure design of the mill, the coal powder is fully ground and sorted in several stages, thus improving the quality and preparation efficiency of the coal powder. This kind of equipment is widely used in the coal grinding system of thermal power plants, becoming an indispensable core equipment in the boiler combustion system, and showing superior performance when dealing with various kinds of hardness and abrasive coal.
2. Mainly consists of two symmetrical grinding circuits. Raw coal first enters the drop pipe through the coal feeder and enters the cylinder of the coal mill under the effect of gravity. The cylinder is equipped with a large number of steel balls, through the rotation of the steel balls to crush the raw coal into coal powder. Primary air enters from the hollow pipes on both sides of the coal mill, drying the coal dust and raw coal by wind power and sending the made coal dust through the ring channel of the winch cage into the separator above, after screening, the unqualified coal dust will return to be regrinded, and the qualified coal dust will be sent to the burner of the boiler for combustion.
3. Part of the primary air will enter into the mixing box to pre-dry the raw coal, and then enter into the separator of the coal mill to complete the drying and conveying of coal powder together with other air flow.

Application fields of double inlet and double outlet ball mill:

1. Thermal power plant: double inlet and double outlet ball mill is widely used in thermal power plant, mainly used in boiler pulverized coal preparation system, to ensure the efficiency and stability of boiler combustion.
2. Iron and steel and metallurgical industry: in some industrial production, double inlet and double outlet ball mill can be used to grind various hardness of coal or other mineral materials, to provide a stable supply of raw materials.
3. Cement industry: It is used in the preparation of coal powder in cement production to ensure efficient and stable fuel supply and optimize the cement production process.
4. Chemical industry: double inlet and double outlet ball mill can be used to process all kinds of fuels, which has important application value in chemical production that requires high precision control of coal powder fineness.
5. Environmental protection field: as a kind of high-efficiency, low energy consumption of coal powder preparation equipment, double in and double out ball mill can play an important role in energy saving and emission reduction, in the efficient utilization of coal resources and efficient combustion of coal powder.