Pulverized coal burner components applying the Coanda effect and pulverized coal combustion devices incorporating it.

By setting a guiding convex curved surface on the burner sidewall to utilize the Coanda effect, fine particles are guided to the second high-temperature zone for preferential ignition, which solves the problem of unstable pulverized coal combustion under low load and achieves complete combustion of pulverized coal and improved flame stability.

CN122083319BActive Publication Date: 2026-06-30北京怀柔实验室
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
北京怀柔实验室
Filing Date
2026-04-21
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing coal-fired boilers have poor pulverized coal combustion stability under low load conditions, resulting in unstable flames and difficulty in maintaining full combustion of pulverized coal, which affects the adjustment flexibility of thermal power units.

Method used

The pulverized coal burner assembly employs the Coanda effect. By setting a guiding convex curved surface on the side wall of the burner, the Coanda effect is used to guide finer pulverized coal particles to the second high-temperature zone for preferential ignition, thereby driving the combustion of coarser particles and forming multiple high-temperature zones to ensure complete combustion of pulverized coal.

Benefits of technology

Under low load conditions, it ensures that both coarse and fine pulverized coal can be fully burned, increases the ignition energy and heat feedback intensity at the flame root, suppresses flame de-flame and flameout, and improves combustion stability.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a pulverized coal burner assembly applying the Coanda effect and a pulverized coal combustion device having the same. The pulverized coal burner assembly includes: multiple burners spaced apart around a predetermined axis; a predetermined connecting line between the center point of each burner's outlet and the predetermined axis; an acute angle between the burner's outlet axis and the predetermined connecting line; and a predetermined plane passing through the burner's outlet axis. A guide is disposed on the sidewall of at least one burner, located on the flame-facing side of the burner. The distance D1 between the first side of the guide convex surface and the burner's outlet axis is less than the distance D2 between the second side of the guide convex surface and the burner's outlet axis. The technical solution of this application effectively solves the problem of poor pulverized coal combustion stability under low load conditions in related technologies.
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Citation Information

Patent Citations

  • Pulverized coal jet flow midstream and downstream combustion organization method in tangent circle pulverized coal combustion boiler

    CN106287678A

  • Low-load stable-combustion pulverized coal combustion device and pulverized coal boiler

    CN117146270A