Biomass gasifier with multiple fire grates

Abstract

The invention discloses a biomass gasifier with multiple fire grates, comprising a furnace body, fire grates, an ash chamber, a bracket for supporting gasifier, and an ash exhausting mechanism; the fire grates are installed in the furnace body; the ash chamber is positioned beneath the furnace body; the fire gates are distributed with through holes; gaps are arranged between the edges of the firegrates and the internal wall of the furnace body to form ash exhausting holes; and an ash pushing mechanism for pushing ash dregs into the ash exhausting mechanism is installed on the fire grates additionally and connected with a fire grate driving mechanism in a protective hood below the fire grates. Since the ash pushing mechanism can transfer ash from fire grates into the ash exhausting holes,raw materials or ash dregs on fire grates are prevented from bridging and accumulating, the chemical reaction of the raw materials is smoothly carried out and the working efficiency of gasifier is improved; simultaneously, the through holes on the fire grates keep through so that combustible gas can be discharged from the bottom of the furnace body; and the gas generating ability of gasifier is strengthened.

Description

technical field [0001] The invention relates to a gasification furnace, in particular to a multi-grid biomass gasification furnace. Background technique [0002] Biomass, coal and other hydrocarbons are the most important type of storable energy produced directly or indirectly through photosynthesis on the earth, especially biomass energy. One of the most worthy of development and utilization of renewable energy. Gasification is one of the important methods for conversion and utilization of biomass energy and coal. The fixed bed gasifier is the type of gasifier that has the lowest requirements on the characteristics of raw materials containing hydrocarbons. Excellent important parts. [0003] Such as figure 1 As shown, it is a schematic diagram of the overall structure of the existing downdraft gasifier. The gasifier 1 includes a furnace body 11, an ash chamber 12, a grate 13, a support 14 and an ash discharge mechanism. The ash discharge mechanism shown in the figure ado...

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Problems solved by technology

[0004] However, the existing grate has the following defects: (1) it does not have the function of continuous ash discharge, and the ash is easy to accumulate on the grate, resulting in low working efficiency of the gasifier; (2) the combustible gas produced by the gasifier It needs to be led out through the through holes of the grate, and the accumulation of ash and slag will easily cause the blockage of the through holes, resulting in the inability of the combustible gas to pass through, thus directly affecting the gas production capacity of the gasifier; (3) Several through holes opened on the grate often It will lead to defects of material leakage; (4) The difference between different types of grates is only the size of their through holes, so the existing grates have poor adaptability to different types of biomass raw materials; (5) The requirements for raw materials Relatively high, the general requirements for biomass raw materials are: small size, dryness, convenient feeding, and not easy to bridge, etc. These strict requirements indirectly limit the wide utilization of biomass energy; (6) The structure of the existing grate It is very simple, and it is difficult to add an automatic control system to control the speed of ash discharge, so the working efficiency of the existing gasifier cannot meet the needs of modern production automation.

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