Burners used domestically
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Burners used in ChinaI. Concentrated and dilute burners
1. WR (Wind range tip) burner
2. PM (Pollution Minimum) burner
3. W-shaped flame
4. Swirl vane coal powder concentration burner
II. Blunt-body burners
III. Flame-stabilizing ship burners
IV. Sandwich air burners
V. Pre-combustion chamber burners
1. Coal pre-combustion chamber burner with expanded smoke cut-off
2. Coal pre-combustion chamber burner with root air
3. Gradually expanding coal pre-combustion chamber burner
4. Fully direct-flow coal pre-combustion chamber burner
5. Adjustable-rotation coal pre-combustion chamber burner
6. Other types of coal pre-combustion chamber burners
1) “Triple-use” type pre-combustion chamber burner
2) Small-tube type pre-combustion chamber burner
7. Low-quality and inferior coal pre-combustion chamber burners
1) Straight-tube low-quality coal pre-combustion chamber burner
2) Straight-tube low-quality coal pre-combustion chamber swirl burner with expansion section
3) Straight-tube low-quality coal pre-combustion chamber swirl burner with root air
4) Straight-tube low-quality coal pre-combustion chamber burner with staged air supply
5) Gradually expanding low-quality coal pre-combustion chamber burner
VI. Other types of circumferential burners
1) High-velocity difference jet burner
2) Flat jet burner
3) Plow-type burner
4) Offset jet burner
5) Split-flow vortex-stabilizing burner
6) PAX-type burner
What are the advantages and disadvantages of these various burners in practical use? Users are welcome to offer suggestions; those with more experience are welcome to share their insights; colleagues are welcome to discuss here in order to identify the best burner suitable for our country’s conditions!
The WR (Wind range tip) burner is equipped with a flame stabilizer and constricting elements within the combustion nozzle, which help to create a high concentration of coal dust, high temperatures, and high turbulence at the burner outlet. This allows the boiler to burn stably at low loads without the need for oil, while also effectively reducing the generation of NO2. It offers the advantages of stable combustion, reduced oil consumption, and less environmental pollution. The most distinctive feature of the PAX (Primary Air Exchange) burner is its simply structured built-in primary air exchange device (separator). B&W’s built-in air exchange device makes clever use of the centrifugal force generated by the flow of pulverized coal gas through the elbow connecting the primary air duct and the burner to achieve separation. After the primary air and coal powder stream enters the eccentric elbow duct before the burner, 90% of the coal powder is separated and flows forward with the rich coal powder stream, while the remaining 10% of the fine powder and 50% of the original primary air are drawn out through the inner exhaust duct and sent into the furnace via the exhaust air nozzles. At the same time, a stream of hot air is introduced into the separator, where it mixes with the coal powder airflow before entering the burner nozzle directly. The result of mixing raises the temperature of the gas and powder before entering the furnace to 175°C–200°C, and the air-to-powder ratio can also be adjusted depending on the amount of hot air introduced. Another feature of the PAX burner is the use of a dual swirl air regulator to adjust the swirl intensity of the secondary air, thereby controlling backflow and mixing. Both the inner and outer sections of the twin regulator are equipped with a set of axially adjustable vanes to regulate their respective swirl intensities. To ensure that the coal powder torch has sufficient stiffness to plunge to an appropriate depth in the lower furnace chamber, the swirl intensity in the outer zone is generally set to a low level; whereas to maintain sufficient high-temperature flue gas flowing back to the ignition zone in front of the burner to enhance ignition, the swirl intensity in the inner zone is set to a moderately high level. An appropriate combination of swirl rates in the inner and outer zones allows the PAX burner to operate at its optimal condition. This post was last edited by lyhh9024 on 2009-3-30 15:53.]