w The combustion device of the flame boiler and the w flame boiler

Abstract

The invention discloses a combustion device for a W-flame boiler and the W-flame boiler. A plurality of primary gas nozzles (1) connected with a hearth are arranged at the tail end of a primary gas pipeline (9); one or more exhaust gas nozzles (2) connected with a vertical wall (4) of the boiler are arranged at the tail end of an exhaust gas pipeline (10); a plurality of secondary air nozzles connected with the hearth are arranged at the tail end of a secondary air pipeline; the multiple primary gas nozzles (1) are gathered, and the secondary air nozzles are arranged around the multiple primary gas nozzles. According to the combustion device and the W-flame boiler, the primary gas nozzles are gathered, so that the ignition of pulverized coal particles is strengthened; the exhaust gas nozzles are arranged at a fixed position of the vertical wall, so that the ignition of exhaust gas flow is facilitated; the secondary air nozzles are arranged around the primary gas nozzles, and each nozzle and a water-cooled wall surface are arranged to form a certain angle, so that the combustion is strengthened, and NOx generation is controlled. The primary gas nozzles are wrapped by the secondary air nozzles, so that the effect that pulverized coal is coated by air is achieved, the water-cooled wall of the hearth is protected, and slag formation is effectively prevented.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a combustion device of a W-flame boiler and a W-flame boiler. Background technique [0002] W Flame Boiler is a boiler specially developed by American Foster Wheeler Company to burn low-volatile coals. It has obvious advantages when burning low-volatile coals such as anthracite and low-quality lean coal. The lower furnace of the W flame boiler is 80% to 120% larger than the upper furnace. The furnace roof protruding from the front and back constitutes the furnace arch. The pulverized coal nozzle is installed on the furnace arch and sprayed downward into the furnace. When the pulverized coal flow flows downward and expands , after meeting the secondary air at the lower part of the furnace, it turns 180° and flows upward, forming a "W" shaped flame. In order to make the pulverized coal ignite in time, burn stably, and burn out, W flame boilers often adopt measures such a...

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Problems solved by technology

[0011] In view of this, the present invention provides a combustion device for a W-flame boiler to solve the problems of poor combustion stability of a W-flame boiler, difficulty in burning out pulverized coal, slagging, and high NOx emissions

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