Grate boiler capable of efficiently combusting fuel

Abstract

The invention discloses a grate boiler capable of efficiently combusting fuel. The grate boiler comprises a main distribution pipe arranged outside a rear wall of the boiler, an over-fire air distribution branch pipe and an over-fire air outlet located at the tail end of the air distribution pipe. According to fuel particles which are reversely blown to the tail part of the fire grate by over fire air in a high-speed jet flow manner, on one hand, light and small unburnt carbon particles are blown back into a hearth again and are continuously burnt in the hearth, and on the other hand, part of heavy and large unburnt carbon particles are prevented from moving on the fire grate, so that the staying and burning time of the unburnt carbon particles on the fire grate is prolonged; meanwhile, high-speed jet over fire air at the tail part of the fire grate enters, so that the disturbance of fluid in a combustion area at the upper part of the tail part of the fire grate can be enhanced, and the oxygen supply amount of the combustion area at the tail part of the fire grate is increased, thereby improving the combustion intensity of fuel on the fire grate and the combustion efficiency of the boiler.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, in particular to a grate boiler capable of burning fuel with high efficiency. Background technique [0002] The grate boiler is a layer-fired boiler in which the fuel is placed on a fixed or mobile grate, the air enters from the bottom of the grate, and the fuel layer formed on the grate has a certain uniform thickness for combustion reaction. Grate boiler combustion technology is mainly used in small and medium-sized boilers, especially in biomass boilers and waste incinerators. It has little or no requirements for fuel preparation, does not require strict pretreatment, and has a high degree of mechanization ,Wide range of applications. [0003] However, most grate boilers have the problems of low combustion efficiency, high carbon content in ash, and large energy waste. At present, the air distribution of the grate boiler is mainly through the way of sending primary air from the bot...

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Problems solved by technology

[0003] However, most grate boilers have the problems of low combustion efficiency, high carbon content in ash and slag, and large energy waste

At present, the air distribution of the grate boiler is mainly through the way of sending primary air from the bottom of the grate, ignition air from the front wall, and secondary air from the front and rear walls. Such a boiler air distribution form is likely to cause little airflow disturbance near the tail of the grate , the oxygen supply is insufficient, so that the fuel cannot be completely burned, the efficiency of the boiler is reduced, and the carbon content of the slag is high

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