Front-mounted type precombustion chamber of biomass direct combustion boiler

Abstract

The invention relates to a front-mounted type pre-combustion chamber of a biomass direct combustion boiler. The front-mounted pre-combustion chamber of the biomass direct combustion boiler comprises apre-combustion chamber adiabatic hearth, a reciprocating fire grate, a combustion-supporting burner, an ash discharging hopper, a fire-grate driving device and an ash discharging device. The front-mounted type pre-combustion chamber is arranged on the basis of a biomass direct combustion power generation boiler yellow straw furnace type, and the burner is arranged at the top of the front-mountedtype pre-combustion chamber to generate a torch to burn fuel on the reciprocating fire grate, evaporate moisture on the surface of the fuel, surface volatile component separates out and burn; and meanwhile the adiabatic hearth of the pre-combustion chamber is heated, a higher temperature of refractory materials of a furnace wall is maintained, so that the fuel is heated and dried in the process ofoverturning and conveying the fuel by the reciprocating fire grate, and when the fuel reaches an outlet of the pre-combustion chamber, the fuel is on fire or has ignition conditions, and ignites andcombusts quickly after entering a main hearth to reach an optimal combustion state. The pre-combustion chamber replaces a preheating ignition section on an original vibrating fire grate, the fire grate area is increased, the residence time of the fuel in the furnace is prolonged, and the ignition and burnout conditions of the fuel is obviously improved.

Description

technical field [0001] The invention relates to the field of biomass direct-fired boiler fuel delivery and dry pre-combustion equipment, in particular to a front-mounted pre-combustion chamber for a biomass direct-fired boiler. Background technique [0002] my country is a large agricultural country with abundant biomass resources. A large amount of agricultural product processing waste is produced every year, such as distiller's grains from winemaking; bagasse from sugar refining; dross (lignin) after biomass ethanol extraction, etc. These types of biomass fuels can still be used as fuels for biomass direct-fired power boilers to generate electricity. However, the moisture content of this kind of fuel is very high, generally above 60%; and because it is derived from crop fruits or stalks, the ash content is also high, and it is a fuel with low calorific value and strong abrasiveness. It has the characteristics of high moisture, high ash, high volatile matter, and low calo...

AI Technical Summary

Problems solved by technology

This results in incomplete combustion with a high carbon content in the ash; and due to the high ash content, incomplete combustion also results in high carbon content in the fly ash

Moreover, the ash content of this kind of fuel is also relatively large. If the grate vibration interval and frequency are adjusted to prolong the residence time of the fuel on the grate to make it fully burnt, the ash will be coked and difficult to discharge.

Therefore, using a vibrating grate biomass direct-fired boiler to burn such agricultural product processing waste to generate electricity has low efficiency and poor overall economy.

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