A method and device for electrochemically enhanced liquid-phase catalytic low-temperature pyrolysis of biomass

Abstract

The invention discloses a method of performing electrochemical strengthening liquid phase catalysis and low-temperature splitting decomposition on biomass. According to the method, ionic liquid is taken as a catalytic reaction medium in a biomass splitting decomposition process, so that the biomass is subjected to electrochemical stimulation in the ionic liquid to make a splitting decomposition reaction and generate a high-added-value split product. An electricity-assisted splitting decomposition reactor used in the method comprises a barrel, a screw type anode and a grid cylinder type cathode, wherein the screw type anode is arranged in the grid cylinder type cathode and is driven to rotate by a motor arranged on the barrel, the screw type anode and the grid cylinder type cathode are arranged in the barrel, the upper end of the barrel is provided with a feeding hole and an air outlet, and the lower part of the barrel is provided with a discharge hole, an ionic liquid inlet and an air inlet. The biomass is heated evenly, the chemical bond of lignocellulose is enabled to break, and an ionic pair midbody is generated and is subjected to electrical field stimulation, thus increasing the splitting decomposition rate; the efficiency is high, the process is easy to control, and the use ratio of the biomass is improved.

Description

technical field [0001] The invention belongs to the technical field of biomass utilization, and in particular relates to a method and device for electrochemically strengthening liquid-phase catalytic low-temperature pyrolysis of biomass. Background technique [0002] As the largest agricultural country in the world, my country has abundant biomass resources, the main sources of which are agricultural and forestry waste, grain processing waste, wood processing waste and municipal solid waste. Agricultural and forestry waste is the main body of biomass resources in my country. my country produces about 650 million tons of agricultural straw every year, plus firewood and forestry waste, which is equivalent to 460 million tons of standard coal. my country's annual forest consumption reaches 210 million cubic meters , equivalent to the energy of 120 million tons of standard coal. In addition, the annual output of urban domestic waste in the country has exceeded 150 million tons. ...

AI Technical Summary

Problems solved by technology

[0004] The development of biomass combustion technology in China is still relatively backward. Agricultural straw, the main body of biomass resources in my country, has long been used only as rural domestic energy resources or incinerated on-site. The utilization rate is extremely low, and the combustion produces pollution such as smoke, NOx and SOx. thing

Fermentation technology mainly includes ethanol fermentation and biogas fermentation. In ethanol fermentation, it is difficult for the catalyst to contact with lignocellulose, and it is difficult to find suitable strains.

The common problems of biogas fermentation are low conversion rate of biogas fermentation raw materials, low gas production rate, poor operation stability, backward advanced treatment technology after anaerobic fermentation, low power generation efficiency of biogas internal combustion engine and low utilization rate of waste heat, etc.

This method has a simple environment and high yield under laboratory conditions, but in actual engineering applications, the reaction environment is complex, the survival rate of microorganisms is low, and it is difficult to control, which will lead to a decrease in yield

In terms of microbial hydrogen production, the emphasis is on basic research, including the transport mechanism and characteristics in the biohydrogen reactor, the optimal design and control of the reactor, and the construction of efficient hydrogen-producing bacteria and molecular ecological diagnosis, metabolic regulation mechanism, bottom line, etc. Insufficient research on matter and light energy conversion efficiency, it is difficult to apply to large-scale engineering applications

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