Home
Service
FAQs
FAQ of coal-fired boilers
What are the functions of primary air and secondary air in a pulverized coal fired boiler?
What are the functions of primary air and secondary air in a pulverized coal fired boiler?
22 May 2020
（1）Primary air is used for transportation of fine coal particle from coal mill to boiler floor at different elevations as per requirement.
（2）Primary air is used for preheating of moisturized coal into the coal mill so that minimum energy is required for combustion of the same.
（3）As we all know that only 23% oxygen is available in the air by weight. For combustion of huge quantity of coal inside the boiler very high quantity of oxygen is required. This oxygen requirement will be completed by secondary air which is supplied by FORCED DRAFT fans through ducts.
（4）This secondary air is coming via air preheater hence its outlet temperature increases this will help in combustion and low heat input is required for combustion of coal.
Related FAQs
View More
Related products
View More
-
SZL series coal-fired steam boilerLive Chat6-35 t/h1-2.5 MPa -
DZL series coal-fired steam boilerLive Chat2-10 t/h1-2.5 MPa -
DHL series coal-fired steam boilerLive Chat20-75 t/h1.25-5.4 MPa
By boiler medium
By boiler structure
-
Email us
-
WhatsApp: +86 18861589035
WeChat: +86 13506150756
Live Chat
Related news
View More
-
As clean heating upgrades continue to accelerate across northern China, high-efficiency and environmentally compliant heating equipment has become essential to ensuring winter heating security while supporting the country’s carbon reduction goals. In Tianjin, several large district heating companies have independently selected the same core solution — the ZOZEN SZS series gas-fired hot water boiler — delivering stable heat throughout the winter while contributing to improved ai...27 Jan 2026 -
The Regulations on the Administration of Rare Earths, effective from October 1, 2024, are accelerating the rare earth industry’s standardized and intensive transformation under the framework of resource protection, compliant governance, and green development. As demand for rare-earth permanent magnet materials from sectors such as new energy vehicles, wind power, and intelligent manufacturing stabilizes and improves, industry sentiment is rebounding. As the “World Capital of Rare Ear...20 Jan 2026 -
Against the backdrop of accelerated global carbon reduction and increasingly stringent safety and environmental supervision, internationally recognized compliance qualifications have become an important foundation for industrial equipment manufacturers to expand into overseas markets. With ASME (American Society of Mechanical Engineers) certification as a core cornerstone, ZOZEN Boiler continues to advance the international upgrade of product compliance and engineering service capabilities, driv...13 Jan 2026
Latest cases
View More
