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4-channel Coal Powder Burner

   It is mainly applied to sludge, coal slime and slush; dry viscous materials such as FGD gypsum and animal manure; also can be used to drying industrial materials (mineral slags and silica); can be applied to drying organic lees, medicine residues, pomace, straw feed, sawdust and biological peat. 

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Technical introduction

  RS series four-channel coal powder burner is a kind of equipment which is developed and designed by our company based on advanced technology, various rotary types, various qualities of coal powder and different process conditions. The special structure and reasonable technical parameters of this burner guarantee full mixture of primary air and secondary air. With high burning efficiency, powerful heat, good shape of flame and simple adjustment, it has been tested and used repeatedly.
   This series of coal powder burner has been widely applied to cement kiln, pellet kiln, cement kiln, lithium kiln, magnesium oxide kiln, alumina kiln and ore dressing kiln in building materials, metallurgy, chemistry and other industries. With advanced technology, precise processing, special materials, long service span and high-temperature resistance, it enjoys good reputation among various industries.
Diagram of various air flows and coal powder in four-channel coal powder burner 
Four-channel coal powder burner


 RS series coal powder burner developed by our company learns from foreign advanced technologies and design concept. With guidance of relevant experts in national academy of sciences, we develop a new generation of burner according to the quality of coal. This product takes advantage of large of velocity difference principle of the same direction. It makes full use of secondary air, which makes the temperature of coal powder to ignition point. When the coal powder leaves the nozzle, coarse conical flame will be formed. Stable plate technology is adopted in the inner wind which makes the flame reach to best effect. At the same time, the service span of nozzle can be increased. Kiln skin can be protected and the service span of kiln liner can be expanded. The amount of primary air only takes up 5 to 7% of total. It is characterized by energy-saving. For 30% to 35% lignite, about 10% anthracite is volatilized. The emission of exhaust air can be reduced by over 30%.
The structure of four-channel coal powder burner adopts technology of foreign advanced burner. By analyzing problems of three-channel burner faced by many factories at home, we decide the structure of four-channel burner nozzle. The four channels are center wind, swirling wind, coal wind and DC wind channels from inside to outside. An ignition oil gun can be set in center wind channel according to customer’s request. Center wind flows out through small holes distributed on flame stabilizing plate. Flow amount of wind accounts for 0.03% to 0.05% of primary wind. Center wind plays an important role for adjusting negative pressure of jet center re-circulation zone and changing position and size of high temperature zone. Swirling wind channel adopts long helical vane shaft type cyclone. Its special structure can not only reduce aerodynamic resistance, but also can produce enough swirling intensity. With scientific design, it is not easy for these channels to be blocked. For wear parts, ceramics are pasted in order to guarantee the service span. 12 to 16 circuferentially distributed nozzles are installed at DC wind tunnel. With its special cavity design and precise working, these nozzles can produce strong air flow. With less energy loss, these nozzles can improve exit momentum of DC wind and jet flow pattern. In addition, there is a steady flame hood set at external part of DC wind channel in order to avoid early distribution of flame. Meanwhile, it can protect nozzle head. 
Four-channel coal powder burner
 It has been demonstrated by practices and theories that the central disc flame stabilizing device is helpful to form the inner re-circulation zone. The geometry of the exit of the swirl wind has an important effect on the velocity of the jet and the position of the inner re-circulation zone. Under the same swirling intensity, the radial distance between the axial and tangential velocity peaks can be increased with the expansion of the extension port. Four-channel coal powder burner adopts axial telescopic structure for its internal and external casing. It can be adjusted according to real situation in order to produce expansion of nozzle. It is proven by practices that this kind of adjustment is very helpful for controlling the shape of flame.
   The product of air flow rate (m, kg/s) and jet velocity of the four-channel coal powder burner is called the thrust of the burner M (N). The mixing speed between secondary hot air and coal powder and combustion speed of coal powder will improve with the increase of burner thrust. However, if the thrust is too high, there will be negative effects produced. Thus, if users want to limit thrust and relative momentum, users must improve the speed of primary air after reducing the speed primary air. According to recommended values, we can estimate that the speed of primary air is about 180 to 220m/s for primary air volume. At present, many three-channel burners can not reach this standard.
   The wind speed range of four-channel coal powder burner: DC external wind: 160 to 250m/s; swirling inner wind: 120 to 245m/s; coal wind: 20 to 35m/s. it is demonstrated in industrial practice that the volume of primary air can be effectively reduced by improving exit momentum of primary wind;
Technical features:
1. The shape of flame can be adjusted;
There are many adjustment methods for four-channel coal powder burner. With same air volume, different ratio of inner and external wind and exit jet flow type can be adjusted steplessly in order to get proper flame shapes suitable for various situations.
2. Save energy and reduce consumption:
Owing to small amount of primary wind, DC wind and swirling wind can be adjusted to best ratio, which is beneficial for full combustion of coal powder. It is demonstrated that if every 1% primary air volume is reduced, 8.70 to10.46kJ/kg fuels can be reduced. Meanwhile, secondary air can be improved obviously.
3. Has strong adaptability to coal: can use low-volatile coal and anthracite; the finess (The percentage of 0.080mm sieve residue is 0.5 to 0.75 times of the percentage of volatile) is adjusted according to the volatile content of combustion; meanwhile, adjust the thrust of burner in order to realize the application of low-violate coal for incineration in rotary kiln.
4. Low emission of NO: there is high-temperature flue gas at front part of four-channel burner. The flue gas will flow back which produces a negative pressure zone in order to prevent the occurrence of local high temperature. The curve change of temperature along the kiln is very stable, which can effectively avoid the the combustion of NOX and high-temperature NOX. The amount of NOX can be reduced by about 20% to 30%. The emission of flue gas meets national standard.
5. Reasonable structure and good performance: four-channel coal powder burner is characterized by beautiful appearance, complete equipment, small resistance, flexible adjustment and simple maintenance, the performance of this equipment can reach the advanced level of foreign countries.
6. New technology and new materials guarantee long service span: special wear-resistant spraying technology is adopted for vulnerable parts of four-channel coal powder burner. Wearing life of key parts of burner is improved by 5 to 10 times than that of normal steel. Front part and nozzle of four-channel coal powder burner adopt heat-resistant steel, which can guarantee two-year service span under 1100 degree centigrade.
7. Flexible positioning and adjustment:
Suspension system of four-channel coal powder burner can extend and turn according to demand of working conditions in order to produce expansion effect for nozzle.
For burner of small-sized kiln, our company has broken through successfully. Low installed capacity: rotary kiln with daily production of 150 tons; two root blower: total installed capacity is 26.5 kW. Many factoried can produce large equipment but has difficulties to produce burners for small-sized kilns, because the production, process and size demands are higher and more complex. What’s more, the requests for feeding, insulation and operability are higher. Our company adopts aurora location and NC machining nozzle, which has basically meet relevant requirements. 

Working principle

Structure chart of four-channel coal powder burner 
Four-channel coal powder burner
Structure, performance and features
RS series four-channel coal powder is mainly composed of pipeline, spray nozzle, flygate, pressure measuring instruments and protection layer.
Pipeline: consists of axial flow duct, swirl wind duct, coal wind duct, central wind duct and fuel pipe. Because fuel pipe is used for ignition, the equipment is always called as four-channel burner.
Nozzle: it is made from special materials. Spray outlet area of different series of burners can be adjusted. Then, the speed of wind sprayed can be adjusted. Nozzle is one of key parts to guarantee shape of flame and service span.
metal corrugated compensator: it is an important part to connect all ducts, insulation and the adjustment of flame shape.
Flygate: it is used to adjusting wind volume.
Pressure measuring instruments: present the spouting speed of ejector indirectly;
Protection layer: it is also called fireproof layer; poured by users.
Structure chart of four-channel coal powder burner 
Four-channel coal powder burner

Technical parameters

Models and technical parameters
Model Normal coal consumption(t/h) Maximum coal consumption(t/h) Weight Coal air blower Static wind fan
Air quantity(m³/min) Air pressure(kpa) Air quantity(m³/min) Air pressure(kpa)
   0.5~1.5  2.5  1200  
   1.5~2.5  3.0  1500  
   2.5~3.5  4.0  1950  
 25.6  19.6
 24.6  29.4
   3.5~4.5  6.0  2100  
 32.3  19.6
   3.5~5.0  7.0  2300  
 41.6  29.4
 40.1  19.6
   4.0~6.0  8.0  2500  
 53.1  29.4
 51.6  19.6
   4.5~7.0  9.0  2800  
 63.2  29.4
 60.9  19.6
   5.0~8.0  10.0  3000  
 75.4  29.4
 73.3  19.6
   6.0~9.0  11.0  3200  
 77.3  29.4
 76.0  19.6
   6.5~10.0  12.0  3600  
 89.2  29.4
 86.7  19.6
   7.0~11.0  13.0  3900  
 89.2  29.4
 86.7  19.6
 118  29.4
 114  19.6
 129  29.4
 125  19.6
 155  29.4
 148  19.6
 168  29.4
 161  19.6
1. These technical parameters are for RSQ Series four-channel coal powder burner. Special parameters are decided by different processes and burner’s model.
2. Roots blower used in this chart is applied for area whose altitude is not over 1000 meters. If the altitude is higher than 1000 meters, air quantity and air pressure need to be adjusted.

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Address of headquarters:NO. 198, longding industrial zone, high-tech development zone, zhengzhou city, china

Zhengzhou Taida Group    Address:NO. 198,longding industrial zone,high-tech development zone,zhengzhou city,china    Sitemap