Fixed bed reactor and method for preparing activated carbon by continuously pyrolyzing biomass at low temperature

Abstract

The invention relates to a fixed bed reactor and a method for preparing activated carbon by continuously pyrolyzing biomass at low temperature. The reactor comprises a feeding hole, a reaction system and a discharge hole, wherein the feeding hole is formed above the discharge hole; the reaction system comprises a gas collecting chamber, a gas collecting region and a reaction chamber from top to bottom; a feeding screw, a discharge screw and a material plate are arranged in the reaction chamber; the material plate has a feed end and a discharge end; the feeding screw is arranged below the feeding hole and above the feed end; the discharge screw is arranged above the discharge end; the discharge end is above the discharge hole; the feeding screw comprises a central screw and left and right screw blades; the left and right screw blades are traversed by the central screw and are in axial symmetry by being vertical to the center line of the central screw; the distance between the left and right screw blades is 1 / 3-1 / 2 of the aperture of the feeding hole; reaction chamber clapboards are arranged in the reaction chamber; the two ends of the reaction chamber clapboards are respectively connected with a steam inlet and steam nozzles to spray steam to the reaction chamber. The reactor can achieve pyrolysis of biomass and preparation of activated carbon at the same time, can achieve continuous feeding and discharge and has obvious economic benefits.

Description

technical field [0001] The invention relates to the field of biomass treatment, in particular to a fixed-bed reactor for low-temperature continuous pyrolysis treatment of biomass, and a method for preparing activated carbon from biomass using the reactor. Background technique [0002] my country is rich in biomass resources. It 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. It is expected to increase to 904 million tons by 2050, equivalent to 600 million tons. tons of standard coal. my country's annual forest consumption reaches 210 million cubic meters, which is equivalent to the energy of 120 million tons of standard coal. In addition, the annual output of urban biomass in China has exceeded 150 million tons, and the annual output will reach 210 million tons by 2020. The average organic matter content in garbage is about 40%. Among the annual output of 150 millio...

AI Technical Summary

Problems solved by technology

Therefore, this method cannot realize continuous feeding and discharging of materials under the condition of hot state, has no automatic material distribution and discharging functions, and does not realize high-temperature pyrolysis of non-condensable gas to provide heat by itself.

The process of feeding and discharging materials needs to heat up and cool down the reactor, which reduces the processing capacity and efficiency of the device and increases the failure rate

Images