Pulverized coal burner

Output: 13-43t/h

Fuel consumption: 185-1500km

Emission standard: 30mg/m³

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Pulverized coal burner

Pulverized coal burner, is also known as pulverised coal burner, it refers to the equipment that can make pulverized coal fully burn in a short time and produce high temperature eddy current. According to the use, pulverized coal burners are divided into: special pulverized coal burners for rotary kilns, pulverized coal burner for boiler, pulverized coal burner for asphalt mixing station. According to the structure, it can be divided into: swirl pulverized coal burner and direct pulverized coal burner.

Due to environmental reasons, the design of multi-channel gas burner, gas-gas burner, oil-gas burner, etc., can not only meet the needs of low operating cost production, but also meet the requirements of environmental protection emission.

Performance characteristics of multi-channel pulverized coal burner

  1. Multi-channel special design, five channels and four air channels, high pulverized coal burning rate.
  2. Energy saving and consumption reduction, complete combustion, while a low combustion air consumption, energy saving to reduce production costs;
  3. Reduce the burning loss of the flame to the brick body, long life;
  4. Coal is widely adapted. Can be applied to inferior fuel coal, reduce fuel operating costs.
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Pulverized coal burner for rotary kiln

Pulverized coal burners in rotary kilns have been developed from single air passage to three air passage and four air passage. The more air ducts, the better the performance, but the more complex the structure, the greater the quality, the higher the cost, and the easier it is to bend and deform when used. From the effect of mixing coal air and air, burners can be divided into rotary flow and segmented, segmented four-duct burner channels are divided into external axial flow air, coal air, internal axial flow air and internal rotational flow air, in which the external axial flow air is injected axially, and the air duct is continuously formed. Because the segmented burner divides the coal air into four jets, the pulverized coal is ejected in the circular direction unevenly. There is a certain gap between the formation of flame integrity and that of swirl flow, and it increases the wear of coal air passage. An important index to measure the performance of the burner is the amount of primary air.

The swirling pulverized coal burner is to strengthen the pulverized coal combustion by using the combination jet formed by direct and swirling wind and the balanced flow formed by the central wind. Due to the special structure of the burner, the pulverized coal is sent into the combustion area, and the pulverized coal and the combustion air are fully mixed, quickly ignited and fully burned through eddy current, reflux and other methods and injection efficiency. At present, the primary air consumption of four-duct pulverized coal burners with excellent performance can be reduced to 5% ~ 7%, or even 3% ~ 4%, which can burn high-quality bituminous coal, but also low-quality coal, low-volatile coal, anthracite, petroleum coke, coal shale, waste tires and household waste. Requirements for pulverized coal burners in rotary kilns. It has strong adaptability to fuel, especially when burning anthracite or inferior coal, it can ensure complete combustion under a low air excess coefficient, and the lowest CO and NO emissions.   The flame shape can make the whole firing zone have strong and uniform heat radiation, which is conducive to the normal development of clinker granulation and mineral crystal phase, prevent the firing zone from blowing dust, form a stable kiln skin, and extend the service life of the firebrick. Annular intermittent spray is used to ensure that the hot state is not deformed, the jet is uniform and stable, and the flame shape is formed. It is best to use multiple small nozzles for spraying. The use of the flame hood technology to avoid the peak temperature, reduce the emission of harmful gas NO, make the temperature distribution in the kiln reasonable, improve the pre-burning capacity. The flame stabilizer is used, which is less affected by the fluctuation of coal feeding amount, coal quality and kiln condition, and the flame is more stable. The structure is simple, sensitive and convenient to adjust, adapt to the change of different kiln conditions, meet the requirements of burning different coal quality and forming different flames.

specifications of Pulverized coal burner

Kiln Output300T/D500T/D600T/D800T/D
Coal Injection Rate(t/h)1-32-64-86-9
Pulverized Coal Wind Velocity(m/s)25-3025-3025-3025-30
External Axial Flow Wind Velocity(m/s)300-360300-360300-360300-360
Swirling Wind Velocity(m/s)220-280220-280220-280220-280
Vortex Wind Velocity(m/s)140-180140-180140-180140-180
Turndown Ratio1:111:111:111:11

Working principle of Pulverized coal burner

The basic principle of plasma ignition technology is to directly ignite pulverized coal with a high-power arc. The ignition device uses DC current (more than 200 A) to initiate arc through cathode and anode contact under medium pressure greater than 0.01MPa, and obtains stable power DC air plasma under strong magnetic field. Its continuously adjustable power range is 50 ~ 150 kW, and the central temperature can reach 6000 ℃. After the primary air powder is sent into the plasma ignition pulverized coal burner, the dense phase pulverized coal enters the central area of the plasma torch and catches fire quickly within about 0.1s, and provides a high temperature heat source for the light phase pulverized coal, so that the light phase pulverized coal also catches fire quickly, and finally forms a stable combustion torch. The wall of the burner is cooled by gas film cooling technology, which can cool the wall of the burner, prevent burning damage and slag formation, and cool the electrode and coil with demineralized water.

pulverized coal burner working process

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