Multi-coal adaptable low NOx combustion system

Abstract

Provided is a multi-coal-type adaptive type low-NOx burning system. Boiler smoke in a boiler tail smoke channel is delivered into an inlet of a coal pulverizing system through a boiler smoke fan and a corresponding pipe, exhaust gas in the coal pulverizing system can enter a primary-air bellows through a corresponding pipe system to participate in pulverized coal delivery, simultaneously the primary-air bellows can be connected with an angle adjustable type high-speed over fire air (OFA) nozzle on the upper portion of a boiler, and a part of hot primary air of a high pressure head is utilized as high speed OFA to be delivered into a boiler cavity. The system can reduce burning strength of the pulverized coal in the boiler and the temperature level of a main burning area by means of the smoke recirculation burning, can achieve the effect that the pulverized coal is burned in grading mode along the air depth in the height direction of the boiler by means of the angle adjustable type high speed OFA, screen bottom air and the like, improves adapting capability to the pulverized coal, restrains generation of NOx, prevents boiler slag bonding, and ensures operation safety and economy of the boiler.

Description

technical field [0001] The invention belongs to the field of low NOx combustion systems for burning coal, and in particular relates to a multi-coal adaptive low NOx combustion system. Background technique [0002] The pulverizing system of traditional power plant boilers is designed and selected according to the design coal type of the boiler, and is suitable for coal types similar to the design coal. When the actual combustion coal quality of the boiler is quite different from the design coal type, the pulverizing system cannot meet the requirements of actual operation output and explosion protection. At the same time, the geometric and thermal characteristics of the boiler are also designed and selected according to the design coal type of the boiler. When the actual coal quality is quite different from the design coal type, it cannot fully meet the requirements of coal powder ignition, burnout, and prevention. Requirements for boiler slagging, ensuring steam and water pa...

AI Technical Summary

Problems solved by technology

When the actual combustion coal quality of the boiler is quite different from the design coal type, the pulverizing system cannot meet the requirements of actual operation output and explosion protection.

At the same time, the geometric and thermal characteristics of the boiler are also designed and selected according to the design coal type of the boiler. When the actual coal quality is quite different from the design coal type, it cannot fully meet the requirements of coal powder ignition, burnout, and prevention. Requirements for boiler slagging, ensuring steam and water parameters at all levels, high combustion efficiency and low NOx emissions

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