Biomass semi-gasification stove

Abstract

The invention discloses a biomass semi-gasification furnace which comprises a panel fire surrounding cover and an internal furnace, wherein, an inflamer is arranged at the upper part of the internal furnace, a combustion chamber is surrounded by the inflamer, the panel fire surrounding cover is arranged above the internal furnace and covered at the periphery of the inflamer, a secondary fan housing is sheathed outside the internal furnace, a ring-shaped secondary air channel is encircled by an inner shell of the internal furnace and the secondary fan housing, a ring-shaped secondary air chamber is encircled by the inflamer, the panel fire surrounding cover and the inner shell of the internal furnace, the lower end of the secondary air channel is provided with a secondary air inlet communicated with the outside, the upper end of the secondary air channel is provided with a secondary air outlet communicated with the secondary air chamber, and a plurality of secondary air holes that are communicated with the secondary air chamber and the combustion chamber are evenly arranged at the upper edge of the inflamer along the ring direction. The biomass semi-gasification furnace has the advantages of even secondary air intake, improved combustion-supporting efficiency, simple and ingenious structure, small occupying space, low manufacturing cost and convenient installation.

Description

technical field [0001] The invention relates to a gasification furnace using biomass as fuel, in particular to a biomass semi-gasification furnace. Background technique [0002] At present, the common household biomass gasifiers are roughly divided into two types, one is the biomass full gasifier, the existing biomass full gasifier has technical defects, and a large amount of tar, Dust and harmful gases can easily cause blockage of combustible gas delivery pipes and burners. In addition, tar and uncontrollable residual combustible gas (CO) will be directly discharged to the outside, forming secondary pollution. Therefore, it is difficult for biomass full gasifiers to be sold in the market promotion. The other is a biomass semi-gasification furnace. The furnace body of the existing new biomass semi-gasification furnace is provided with a combustion chamber, a gasification chamber and an air chamber in sequence from top to bottom. The combustion chamber, the gasification cham...

AI Technical Summary

Problems solved by technology

[0003] 1. The secondary air duct generally adopts the form of the lower opening or the opening of the furnace body to insert the air pipe. This structure is likely to cause uneven distribution of the secondary air intake, and the area of ​​the air intake is too small, which affects the wind force of the secondary air.

At present, many manufacturers use micro-fans to provide secondary air oxygen supply. The disadvantages are: complex structure, large space occupation, high production cost; external power is required to drive the fan, high cost of use; uneven wind distribution causes the flame to be biased to one side. The heated parts are heated unevenly; the secondary air introduced is unheated cold air, and the combustion efficiency is low

[0004] 2. The semi-gasification furnace can produce more combustible gas by smoldering the biomass in the anoxic state of the gasification chamber. However, the ventilation volume of the existing furnace bridge structure is relatively large. In order to maintain the anoxic state of the gasification chamber , the existing gasification chambers are all designed to be relatively high, the purpose is to reduce the flow of air through the accumulation height of biomass in the gasification chamber, so the design of the gasification chamber makes the shape of the biomass semi-gasification furnace higher, increasing the cost of production

[0005] 3. The burner generally adopts a circular table type with a small top and a large bottom, and the coverage of the secondary air and the ability to capture combustible gases are poor

[0006] 4. The gasification chamber has two structures, one is a gasification chamber surrounded by castings (steel parts), and thermal insulation materials are laid outside the castings (steel parts). Since the castings (steel parts) are relatively poor in fire resistance, they are easy to melt , life is not long

The other is the super-thick refractory cement integral gasification chamber, which has better refractoriness, but is super thick and overweight, has poor heat preservation effect and large heat storage loss

[0007] To sum up, due to the complex structure, large weight, large volume and high production cost of existing biomass semi-gasifiers, it is difficult to promote them. Many manufacturers have to take the path of government procurement, which seriously restricts Market development of the technology

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