Direct-current burner with adjustable concentration of pulverized coal on fire facing side and method

By designing the nozzle body and the blade separation mechanism, the concentration of pulverized coal on the fire side can be adjusted, which solves the problems of unstable combustion and high NOx generation in DC burners at low loads, and achieves stable combustion and low emissions across the entire load range.

CN121676946APending Publication Date: 2026-03-17CHINA RESOURCES POWER HUBEI
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Patent Information

Application Number
CN202512052996.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing DC burners struggle to achieve stable combustion within the 20%-30% rated load range without fuel assistance, and NOx generation is high at low loads, resulting in insufficient combustion stability.

Method used

The nozzle body and blade window separation mechanism are adopted to adjust the coal powder concentration on the fire side through primary inertial concentration and secondary adjustable concentration. This includes the elbow design of the nozzle body and the translation adjustment of the series blade group, so as to achieve flexible control of the coal powder concentration.

Benefits of technology

Stable combustion is achieved within the range of 15%-100% of the rated load. At low load, the flue gas temperature at the furnace outlet increases, and NOx emissions are controlled below 50mg/m³, meeting the requirements for deep peak shaving.

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Abstract

The invention relates to the technical field of direct-current combustors. The direct-current burner comprises a nozzle body arranged at the corresponding corner of a boiler hearth, a spray head arranged at an air outlet of the nozzle body and a blade window separation mechanism, an elbow is arranged in the middle of the nozzle body, primary inertial concentration is carried out when pulverized coal airflow passes through, and the concentration a of the fire-facing side is improved; the blade window separation mechanism is arranged in the spray head, and secondary adjustable concentration is carried out when pulverized coal airflow passes through the blade window separation mechanism. When the boiler is in a low-load operation state, the elbow can enable coarse particle pulverized coal with the particle size larger than 50 micrometers to be enriched in a wall-attached mode, high-concentration wall-attached flow with the thickness larger than or equal to 50 mm is formed, and the concentration is 80%-100% higher than that of main flow; the stable combustion of the boiler in a rated load range of 15%-100% can be realized through the adjustment of the control piece; and when the load is low (less than or equal to 30% of rated load), the smoke temperature at the outlet of the hearth is increased by 30-50 DEG C, the ignition condition is improved, the smoke temperature at the inlet of the SCR denitration system is maintained to be more than or equal to 300 DEG C, and the NOx emission concentration is controlled to be below 50mg / m.
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