Hearth structure of downdraft biomass fuel vaporizing furnace

Abstract

A hearth structure of a downdraft biomass fuel vaporizing furnace belongs to the technical field of stoves. The downdraft biomass fuel vaporizing furnace comprises a vaporizing furnace body which comprises a hearth. A drying zone, a cracking zone, an oxidation zone and a reducing zone which communicate with each other are formed inside the hearth from top to bottom. The invention is characterized in that a portion on the inner wall of the hearth corresponding to the oxidation zone expands inwardly to form a structure with the internal diameter less than that of the cracking zone as well as the reducing zone. The invention has the following advantage: the portion on the inner wall of the hearth corresponding to the oxidation zone expands inwardly to form the structure with the internal diameter less than that of the cracking zone as well as the reducing zone so as to guarantee that the temperature of the oxidation zone is higher than that of the cracking zone and the reducing zone, help reduce carbon dioxide gas into a carbon monoxide gas in the reducing zone and significantly raise effects of the produced carbon monoxide gas.

Description

technical field [0001] The invention belongs to the technical field of furnaces, and in particular relates to a furnace structure of a downdraft biomass fuel gasification furnace. Background technique [0002] The well-known situation is: on the one hand, the price of non-renewable resources such as coal, oil and natural gas is constantly increasing due to the increasing shortage, and the tension and sense of crisis of relying on natural resources are increasing because of the lack of ideal countermeasures for human beings; A large amount of available biomass energy is seriously wasted. The available biomass energy mentioned here is mainly but not limited to such as rice bran, rice straw, wheat straw, corn straw, soybean straw, sorghum straw and sawdust, etc. Especially in rural areas, people often see the phenomenon of farmers burning straw, which not only damages the environment, but also wastes resources. Despite efforts by the government and agricultural experts to enc...

AI Technical Summary

Problems solved by technology

This type of device can be seen in Chinese patent documents, typically such as the biogasifier recommended by the Chinese Invention Patent Publication No. CN101531925A (the application proposed by the inventor of the applicant), the patent application scheme has the description on page 2, page 20 To the technical effect mentioned in line 22, but there are the following defects: the furnace structure of the gasifier body is unreasonable, and the specific performance is that the surface area of ​​the oxidation zone and the reduction zone are the same, that is, equal, resulting in a high temperature in the reduction zone, and The temperature in the oxidation zone is not ideal (low), which is not conducive to the full reduction of CO 2 to CO, and the effect of CO gas production is poor. In addition, the oxidation zone and the cracking zone tend to be equal in area, resulting in the cracking zone, The boundary between the oxidation zone and the reduction zone is not obvious, so the tar substances produced by the drying zone and the cracking zone cannot be fully oxidized in the oxidation zone, because, as a biogasifier, the temperature of the cracking zone should be around 600-800 ° C, and the oxidation The temperature in the zone should be about 1200°C, the temperature in the reduction zone should be around 400-600°C, and the temperature in the oxidation zone is the highest, and the formation of this temperature curve relationship must be guaranteed by the structure of the furnace, and this temperature curve relationship is very important for oxidation. The effect is crucial, that is to say, the tar material can be fully oxidized ideally. However, the furnace of this patent application is designed to make the areas of the cracking zone, oxidation zone and reduction zone tend to be equal, which is obviously not enough to ensure the temperature of the oxidation zone. Satisfy the requirement of around 1200℃

Images