Stable combustion device for pulverized coal ignition

Abstract

The invention discloses a stable combustion device for pulverized coal ignition, which comprises a primary air pipe, a flow guide sleeve, pulverized coal concentrator and a guide pipe as well as an ignitor, wherein pulverized coals pass through the primary air pipe, the flow guide sleeve, the pulverized coal concentrator and the guide pipe are arranged in the primary air pipe in sequence, and the ignitor is radially arranged at an outlet of the primary air pipe. A rotational flow blade capable of rotational liquid jet is arranged between the guide pipe and the inner wall of the primary air pipe; and a secondary air duct formed by a secondary air pipe is arranged outside the primary air pipe and an expanding primary air pipe. In the structure, a central recirculation region is formed behind the adjustable rotational blade; the ignitor is close to a low-speed central recirculation region to form a continuous and stable intensified heat source, thus the intensified heat source can be used as an ignition heat source required by the ignition of pulverized coal air flow so as to reduce the generation of NOX (nitric oxide) in the furnace effectively, and challenges caused by operation factor interferences and the substantial vibration of coal quality which occur suddenly can be dealt with. Therefore, the combustion device is suitable for pulverized boilers for burning various coals, not only can be used as a stable ignition combustion device, but also used for the operation of a main combustor.

Description

technical field [0001] The invention relates to an industrial pulverized coal airflow ignition and stable combustion technology, in particular to an ignition and stable combustion device for a power station pulverized coal boiler. Background technique [0002] For a long time, coal has always accounted for more than two-thirds of China's primary energy production and consumption structure, and this situation is difficult to change for a long time. Therefore, the safe, clean and efficient utilization of coal is particularly important to our country. At present, most pulverized coal boilers in power stations use oil to support combustion to achieve stable combustion at low loads, which increases operating costs. On the other hand, changing coal types or declining coal quality in operation will also lead to unstable combustion, delayed ignition and increased fly ash combustibles. In order to improve the stability of pulverized coal ignition and combustion, improve combustion ...

AI Technical Summary

Problems solved by technology

In other words, the existing ignition and stable combustion equipment does not completely solve the influence of the flow field structure in the combustion reaction zone on ignition and combustion stability, and ignores the important role of flame propagation speed on flame stability.

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