Natural gas rotary kiln burner: automatic temperature control and remote DCS control

This system adopts a four channel gas burner, which consists of a central air duct, a gas duct, a swirl air duct, and a direct current air duct from the inside out. The central wind mainly regulates the amount of oxygen in the center of the flame, the position and size of the reflux zone, and also plays a role in protecting the burner head; Gas ducts evenly transport gas; The swirl air duct adopts an axial flow cyclone with spiral blades, which has low aerodynamic resistance and high swirl intensity. The high-speed swirling airflow of the swirl air can create an internal reflux zone, thereby playing a role in stabilizing combustion; The DC air nozzle adopts a specialized nozzle with circumferential distribution, which sprays high-speed airflow and absorbs secondary high-temperature air, ensuring full mixing of gas and hot flue gas, and enhancing combustion. By simple operation of various manual valves, uniform speed regulation of each air duct can be achieved and a good matching effect can be produced.

This burner has the following characteristics:

By calculating the parameters of the end flow field, design a reasonable combustion air and gas channel structure to form a regular flame shape and stabilize combustion;

Optimize the axial and swirling air ducts, improve the dynamic energy of axial air, and reduce energy consumption;

The fuel air fuel ratio is ideal and the combustion effect is good.

In addition, the design of the burner is relatively robust, fully considering the strict requirements of the industrial field for the burner. Its internal design is sturdy components, without any vulnerable/consumable parts, and the burner has a long service life and durability. After installation, users do not need to repeatedly disassemble and repair.

（3） Multi channel burner gas and combustion air pipeline system

(1) Gas pipeline system

The gas pipeline of the system includes gas manual ball valves, metal hoses, etc. The gas pressure is adjusted from the gas station to 10-30kPa, with a reserved interface to the burner.

The safety shut-off valve is interlocked with the control system for fault shutdown to ensure safe operation of the system.

The gas regulating valve is used to regulate the gas flow, and its valve opening is given by the control system.

Combustion air system

The system air supply system adopts Roots blower, which is driven by a frequency converter. The frequency of the blower is given by the operating system through real-time temperature calculation of the furnace, and can be directly operated on the panel in manual mode.

The combustion air system of the system only requires an external interface, and the central air duct of the burner, swirling air, and axial air are all integrated and designed. The combustion fan adopts Roots blower and is driven by frequency conversion. The central air, swirl air, and axial flow air branch pipelines are equipped with regulating valves, and the operator can adjust the air volume according to the specific combustion state to achieve the ideal combustion state.

When the multi-channel burner is working, the Roots blower provides primary air volume, with low air volume and high air pressure, which can elongate the flame length; Due to the negative pressure inside the furnace, secondary air enters the furnace through the discharge port, providing sufficient air volume for the full combustion of fuel. For more technical details, please call (WeChat synchronization): 15713691937.

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