Spiral feeder used for fluidized-bed-type fast biomass pyrolysis

Abstract

The invention relates to a feeding device, in particular to a spiral feeder used for fluidized-bed-type fast biomass pyrolysis. A storage bin is arranged above an air seal machine, material in the storage bin is conveyed into the shell of the feeder by virtue of the air seal machine, and biomass is continuously pushed into a fluidized bed reactor by virtue of an auger arranged in the shell. By virtue of mechanical sealing of the air seal machine and pressure separation and air locking of material filled in a conveying pipe, the feeder does not generate back spraying phenomenon; a stirring bar member is arranged in the storage bin, and power is provided for the stirring bar member while the air seal machine rotates to discharge material, so that the stirring bar member moves up and down and stirs the material, and phenomena of bridging, hanging on the wall and the like can be avoided; meanwhile, a variable frequency motor is connected with a gear transmission box to provide power for the auger and the air seal machine, and feed rates of the auger and the air seal machine are guaranteed to be consistent by virtue of speed ratio.

Description

technical field [0001] The invention relates to a feeding device, in particular to a screw feeder for rapid pyrolysis of fluidized bed biomass. Background technique [0002] my country is very rich in biomass energy. At present, about 687 million tons of crop straw can be obtained every year in the country, and about 60% can be used as energy, that is, about 420 million tons of straw can be used as biomass raw materials every year, equivalent to about 210 million tons of standard coal; forestry The remainder can obtain about 125 million tons per year, equivalent to about 71.25 million tons of standard coal. It is predicted that by 2050 my country's exploitable biomass resources will reach at least 1.5 billion tons. The effective use of biomass can not only solve energy problems, but also solve environmental problems, and has good effects in energy saving, emission reduction, carbon emission reduction, energy recovery, etc. Fluidized bed fast pyrolysis technology can convert...

AI Technical Summary

Problems solved by technology

Due to the characteristics of low density, large angle of repose, and poor fluidity of biomass, problems such as bridging and hanging on the wall are prone to occur in the silo during the feeding process, resulting in unstable feeding or stop feeding

The fluidized bed biomass rapid pyrolysis system is a positive pressure system. If the seal is not good, the hot air flow in the reactor will escape and form back spray, making it difficult for the material to enter the reactor.

[0004] The existing biomass feeder cannot completely solve the problems of bridging and wall hanging caused by biomass with low density, large angle of repose, and poor fluidity.

At the same time, the existing biomass feeder cannot prevent backspray while ensuring continuous and uniform feeding

These two factors largely limit the development of fluidized bed biomass rapid pyrolysis technology.

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