Thermal cracking treatment method for biomass straw

Abstract

The invention discloses a thermal cracking treatment method for biomass straw. The method comprises the following steps: step 1, gas with stable chemical properties is introduced into a carbonizationfurnace to ensure that the furnace has oxygen content lower than 1% inside and is in a micro-positive pressure state; step 2, a ring kiln is started, and the carbonization furnace is heated by liquefied gas; step 3, feeding is performed, and biomass particles enter the carbonization furnace through a loading screw and a feeding screw; step 4, a gas separation system is started, and a scrubbing tower is started; step 5, after gas production, cracked gas after scrubbing is introduced into a combustion furnace for combustion, and the liquefied gas is closed; step 6, wood vinegar spraying is started after biochar is discharged from a char discharge system; step 7, parameters are regulated to ensure stable operation of the system. The method has the advantages that quality of the biochar is guaranteed, production efficiency is increased, large-scale continuous production can be realized, liquid-gas separation is relatively perfect, temperature is easy to control, and energy is used circularly.

Description

technical field [0001] The invention relates to a biomass treatment method, in particular to a biomass straw pyrolysis treatment method. Background technique [0002] As a large agricultural country, my country has very rich crop straw resources. The total annual production of crop straw is about 700-1000 million tons, of which rice, wheat, corn and other major food crop straws are about 500 million tons, and crop straw is mainly used for Biomass fuel, fertilizer, feed and industrial raw materials. According to statistics, 15% of China's straw is directly returned to the field every year, 24% of the straw is used for feed, 2.3% of the straw is used for industrial raw materials, and most of the rest is used as energy. use. However, in recent years, the rural economy has developed rapidly, which has greatly improved the living standards of farmers. Most of the crop stalks are discarded in the fields, and some areas are even burned directly in the fields. This not only causes a ...

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Problems solved by technology

[0008] The existing straw pyrolysis and carbonization technology mainly has the following disadvantages: (1) Outdated technology, low product yield, and difficult gas treatment; (2) Low productivity, not continuous production, not suitable for industrial production requirements; (3) High energy consumption , the economic benefit is poor, and the product biochar quality

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