Method for preparing flammable gas by cracking of agriculture and forestry wastes, and special apparatus thereof

Abstract

The present invention relates to a method for preparing flammable gas by cracking of agriculture and forestry wastes, and a special apparatus thereof. The method is characterized in that: agriculture and forestry wastes are crushed and pelletized, and then are added to a cracking furnace; with adopting a microwave ignition manner, the crushed agriculture and forestry wastes and a small amount of air are subjected to a thermal cracking reaction under an incomplete combustion condition to produce the flammable gas. The special apparatus comprises a furnace body, a material inlet arranged on the top of the furnace body, a waste material outlet arranged on the bottom of the furnace body, and a flammable gas outlet. The special apparatus is characterized in that: microwave heating sources are arranged in a line-row type manner on the upper part of the furnace body; the material inlet is communicated with a material feeder by a pipe; the flammable gas outlet is arranged on the lower part of the furnace body, and is sequentially connected with a tar purifier and a cooler by pipes. According to the present invention, based on the characteristic of the microwave heating technology, with combination of the incomplete combustion reaction generated by the sucked air and the material, the efficiency of the production of the flammable gas is high, and the production capacity is improved, wherein the air is sucked by the negative pressure generated by suction of the flammable gas with the vacuum pump.

Description

technical field [0001] The invention relates to the technical field of a method for producing combustible gas and a special device, in particular to a method and a special device for producing combustible gas by cracking agricultural and forestry waste. Background technique [0002] The annual availability of straw resources in my country is 700 million tons, equivalent to about 350 million tons of standard coal, plus the branches, leaves and fruit skins, cores, shell cores, various wormwood and wood chips that were not available in the past. , sugar slag, etc. (collectively referred to as agricultural and forestry waste), the total amount can reach nearly 2 billion tons, equivalent to 1 billion tons of standard coal. For a long time, straw has been the basic fuel of farmers' life and the material material of agricultural production in our country. In some major grain-producing areas, straws are burned in large quantities, which not only wastes precious resources, but also p...

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Problems solved by technology

It adopts a microwave heating device connected to the furnace body, and through the heating of the microwave heating device, the interior of the furnace body can quickly reach the temperature required for the cracking and gasification of plant materials, thereby producing combustible gas. The material is not incomplete combustion during the pyrolysis reaction in the furnace body, so the yield of combustible gas is not high enough, and the combustible gas produced contains tar, and the purity is not enough

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