What is the principle of primary and secondary air regulation in circulating fluidized bed boilers?

The principle of primary and secondary air regulation in circulating fluidized bed (CFB) boilers is designed to maintain stable operating conditions of the boiler, adjusting the volume and temperature of primary and secondary air to achieve efficient combustion and reduce pollutant emissions. Specific adjustment strategies should be optimized and adjusted based on the boiler design and actual operating conditions.

Circulating Fluidized bed steam boiler from ZOZEN

Principles of Primary and Secondary Air Adjustment in ZOZEN SHX Circulating Fluidized Bed Steam Boiler:
The principles mainly include:

1. Primary Air Adjustment Principle: Primary air refers to the main air flow entering the furnace of the circulating fluidized bed boiler. The main purpose of primary air adjustment is to maintain the stable operation of the fluidized bed layer. The adjustment generally follows these principles:
• Control of primary air volume: Adjust the primary air volume according to the boiler load demand and combustion condition changes to maintain the stable fluidized state of the bed layer.
• Control of primary air temperature: By adjusting the inlet temperature of the primary air, control the bed temperature to ensure combustion efficiency and bed layer stability.
2. Secondary Air Adjustment Principle: Secondary air refers to the auxiliary air used for combustion. Adjusting the secondary air can affect the oxygen level and combustion temperature during the combustion process. The main purpose of secondary air adjustment is to optimize combustion effects and reduce pollutant emissions. The principles include:
• Control of secondary air volume: Adjust the secondary air volume according to combustion needs and bed temperature changes to ensure appropriate oxygen level during combustion for more complete and effective combustion.
• Control of secondary air temperature: By adjusting the inlet temperature of the secondary air, the temperature distribution during the combustion process can be regulated to meet combustion requirements and pollution emission standards.

ZOZEN Boiler not only explains the principles of primary and secondary air adjustment in circulating fluidized bed boilers but also provides options for circulating fluidized bed boilers, further explaining how to achieve efficient combustion and reduce pollutant emissions.
ZOZEN’s circulating fluidized bed boiler series includes SHX circulating fluidized bed steam boilers, DHX circulating fluidized bed steam boilers, QXX circulating fluidized bed hot water boilers, and DHX circulating fluidized bed hot water boilers.