Circulating fluidized bed combustion device with biomass fuel and combustion method thereof

Abstract

The invention relates to a cycle fluid bed burning device and relative method which uses biological material as fuel. Said device comprises a furnace, a furnace outlet and a horizontal gas flue. Wherein, the horizontal gas flue has a heated surface, a cyclone separator with middle temperature connected with its back; the upper end of cyclone separator is connected to the tail gas flue, the dust cleaner, the wind guide device, and the chimney; the lower end of cyclone separator is connected to the cycle circuit and the furnace dense-phase area; the circle circuit is connected with bed material and additive feeding inlet to apply the additive which can solve the problem of alkali metal; the biological fuel via the parallel feeding inlets at the front of furnace, the breaking pretreatment is blown by the wind into the section-variable dense-phase area of furnace; and the straw should be first broken into 10cm. The invention has wider raw material and high burning efficiency while it can solve the problem of alkali metal.

Description

technical field [0001] The invention relates to a circulating fluidized bed combustion device and method for burning biomass fuel, and the biomass includes a wide variety of agricultural and forestry wastes such as rice straw, branches, fruit shells and the like. Background technique [0002] my country has very rich biomass resources, and the combustion and utilization of biomass is of great significance to alleviate the shortage of conventional energy, reduce pollutant emissions, solve the problem of rural straw utilization, and increase farmers' income. However, at present, there is no effective large-scale combustion and utilization of biomass technology in China, especially for straw raw materials that constitute the main body of my country's biomass resources. Due to the special physical and chemical properties and combustion characteristics of straw, only Denmark has mastered the relatively mature straw burning technology with vibrating grate as the basic furnace type...

AI Technical Summary

Problems solved by technology

However, the conventional coal-fired circulating fluidized bed is not suitable for directly burning biomass fuels such as straws. Biomass fuels have low energy density, irregular shape, easy to jam, easy to catch fire, high volatile content, low ash content, and light coke ash. The characteristics of soft and rich alkali metals will bring a lot of troubles to the conventional fluidized combustion process, resulting in poor feeding, excessive gas phase combustion, difficult control of the upper part of the furnace temperature, difficult secondary air organization, and large eluent volume. Excessively large, increased solid incomplete combustion loss, and difficult to overcome alkali metal problems when burning specific biomass fuels, etc.

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