High-temperature circular-heating fluidized bed pyrolysis gas producing system

Abstract

The invention belong to the field of high-efficiency reutilization of biomass solid wastes, and particularly relates to a high-temperature circular-heating fluidized bed pyrolysis gas producing system and a corresponding gas producing method. The system comprises a gasification material feed system, a thermal insulation jacket, a fluidized bed, a gas distributor, a waste heat boiler, a grid feeder, a cyclone dust collector, a circular heating furnace, an inclined tube nest, a high-temperature circulating blower, a common blower, a fuel supplementing system, a dust removal purifier and a gas storage device. The gas producing method with the system comprises the following steps: introducing heated high-temperature gas into the gasification raw material for fluidization and gasification to obtain pyrolysis gas; removing powder carbon from the pyrolysis gas by the cyclone dust collector, and dividing the gas into circular gas and outlet gas by the gas distributor; removing impurities from the outlet gas, and storing; and heating the circular gas to remove tar to obtain high-temperature gas, and recirculating. Compared with the prior art, the fluidizing agent used in the invention is pyrolysis gas of biomass, so no tar is generated after high-temperature circulation and purification.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency resource utilization of biomass solid waste, and specifically relates to a high-temperature circulating heating fluidized bed pyrolysis gas production system and a corresponding gas production method. technical background [0002] As people's demand for energy is increasing, fossil fuels as the main energy are decreasing year by year, so finding an environmentally friendly and renewable energy is the focus of global attention. my country is a large agricultural country with a large amount of biomass energy. Biomass energy is a renewable energy that can store solar energy and convert it into solid, liquid and gaseous fuels. The use of biomass energy can effectively reduce greenhouse gas emissions and reduce the global greenhouse effect. In view of my country's current energy structure, biomass not only solves energy problems, but also solves environmental problems. my country is very rich...

AI Technical Summary

Problems solved by technology

At present, the utilization of biomass mainly adopts pyrolysis gasification technology, but it is still in the initial stage of large-scale commercialization

There are many problems in the traditional fixed bed or fluidized bed, the main ones are: (1), the conventional fixed bed reactor mainly has uneven heating, a large amount of tar is easy to be produced during the pyrolysis process, and it is harmful to the raw material. Low adaptability to the types of substances, more carbon residues, secondary pollution problems, low thermal efficiency, low calorific value and instability; (2), the traditional fluidized bed reactor has low adaptability to raw materials, and the processing The amount is small, and the pyrolysis gas and fluidization gas in the reactor are two kinds of gases, which increases the subsequent gas separation process. Since many fluidized bed processes use air as the fluidization gas, the calorific value of the gas is low etc.; (3), the fluidized medium of the developed double-bed fluidized bed reactor is difficult to control, the heating system is too complicated, which increases the operating cost, and the processing capacity of the device is also limited, which cannot achieve high efficiency and low cost. Biomass gasification, etc.

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