Liquid slag trapping biomass combustion device and method

Abstract

The invention relates to a liquid slag tapping biomass combustion device and a method, which belongs to the combustion technical field of the biomass. The device comprises a biomass combustion furnace, a surplus heat boiler and a flue on the tail part of the surplus heat boiler. A secondary draught port is horizontally and obliquely arranged on the upper part of a combustion part of the biomass combustion furnace, a smoke outlet on the bottom part of the combustion chamber is provided with a row of screen pipes, and the top part of each screen pipe is provided with slag trapping eaves to effectively screen the slag. The method comprises the following steps that: air is sent into the combustion chamber through the secondary draught port in a cyclone way after being preheated to 150 to 400 DEG C, the temperature of the combustion chamber is rapidly increased to 1300 DEG C, biomass slag is molten, so the slag tapping is realized, heat exchange is adequately conducted between smoke and an inner heated surface of a surplus heat boiler hearth, the temperature of the smoke is decreased to 500 DEG C to enter the tail flue, and the exhausted smoke is pumped by a draught fan after the temperature is decreased to 120 to 150 DEG C. The device has a simple and reasonable structure, the biomass combustion slag tapping can be adequately realized through the method, the smoke is clean, and the problems such as dust accumulation, coking, corrosion and the like inside the boiler caused by the low melting point of the biomass dust can be solved.

Description

technical field [0001] The invention relates to a liquid slag discharge biomass combustion device and method, belonging to the technical field of biomass combustion. Background technique [0002] With the continuous reduction of fossil energy worldwide and the continuous rise of domestic oil and coal prices, my country is now vigorously calling for the development of new energy sources, and at the same time is facing a huge CO 2 emission reduction tasks. Biomass energy has huge advantages in these aspects. my country is rich in biomass resources, with an annual output of about 1 billion tons, which can be equivalent to 500 million tons of standard coal, and biomass burning CO 2 For near-zero emissions, the resulting SO x and NO x There are also few, so it has a wide range of application prospects. [0003] However, because biomass is rich in K, Na, Cl and other elements, the ash formed after biomass combustion has a low melting point, generally between 950-1100°C, and it...

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Problems solved by technology

[0005] Aiming at the problems of low ash melting point, corrosion and coking caused by biomass rich in chlorine and alkali metal elements at the present stage, the present invention proposes a liquid slagging biomass combustion device and method. During the combustion process, the biomass ash is melted to achieve a liquid state Slag removal, the dust content of the flue gas entering the external furnace is low, which effectively solves the problems of corrosion and slagging on the heating surface

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