Biomass steam boiler secondary air distribution system

Abstract

The invention discloses a secondary air distribution system of a biomass steam boiler, which is composed of a left air pipe, a right air pipe, a front wall air pipe and a rear arch air pipe, and the left air pipe and the right air pipe are arranged on the grate above and longitudinally arranged on the left and right sides of the fire grate, the front wall air duct is arranged above the fire grate and horizontally arranged below the front wall of the furnace, and the rear arch air duct is horizontally arranged in the smoke area and arranged above the rear arch of the furnace , on the fire-facing surfaces of the left air duct, right air duct, front wall air duct and rear arch air duct located in the combustion center of the furnace, there are several air nozzles facing the combustion center of the furnace. The air duct on the left side and the air duct on the right side spray air to the left and right of the combustion center, and the air duct on the front wall and the rear arch air duct spray air to the front and rear of the combustion center, so that the combustion of biomass particles and air can be fully combusted, reducing the excess air coefficient. Reduced black smoke.

Description

technical field [0001] The invention belongs to the field of steam boilers, in particular to an air distribution system of a steam boiler burning biomass fuel. Background technique [0002] At present, the air distribution methods for coal-fired boilers include: waisted air distribution, pagoda-shaped air distribution, and inverted pagoda-shaped air distribution. These air distribution methods have their own advantages and disadvantages, and the technology is relatively mature. However, for biomass fuel boilers, because biomass fuel is easy to catch fire, has high volatile content, short burning time, and only requires a large amount of oxygen in the high-temperature combustion zone, if the uniform distribution of secondary air cannot meet the requirements of complete combustion of biomass fuel If it is not required, the excess air coefficient will remain high during operation, causing black smoke, incomplete combustion, easy slagging, and easy damage to the motor of the sla...

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Problems solved by technology

However, for biomass fuel boilers, because biomass fuel is easy to catch fire, has high volatile content, short burning time, and only requires a large amount of oxygen in the high-temperature combustion zone, if the uniform distribution of secondary air cannot meet the requirements of complete combustion of biomass fuel If it is not required, the excess air coefficient will remain high during operation, causing black smoke, incomplete combustion, easy slagging, and easy damage to the motor of the slagging machine, resulting in low thermal efficiency of the boiler and high equipment maintenance rate.

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