Fluidized bed reactor

Abstract

A fluidized bed reactor comprises a shell, wherein a wind distribution plate which horizontally supports materials and meets the requirements of fluidization wind distribution is arranged in the shell; a wind cap is arranged on the wind distribution plate; a wind chamber is arranged below the wind distribution plate and is connected with the outlet of an air pre-heater; the air pre-heater is connected with an air blower; a separator for performing material separation to the flue gas is arranged in the shell; the inlet of the separator is formed above the inner part of the shell and is arranged horizontally; a separated material outlet of the separator is connected with the upper end of a falling pipe; the lower end of the falling pipe is arranged below the inner part of the shell; the flue gas outlet of the separator is arranged above the outer part of the shell; and a feeding opening and an inert material feeding opening are formed on the side of the shell so as to realize the continuous feeding and supplement of the inert material; by adoption of the reactor, the material particle abrasion amount can be reduced, the reaction time of the reaction material in the reactor is prolonged, the reactor can be controlled remotely; in addition, the reactor has the following advantages that the reaction efficiency is high, a mass of materials can be processed continuously, stably and efficiently, and the product quality is stable.

Description

technical field [0001] The invention belongs to the technical field of material heat exchange reaction in the chemical industry, and in particular relates to a fluidized bed reactor. Background technique [0002] Fly ash is a solid waste discharged from coal-fired boilers with flue gas. It is a glassy solid particle formed by melting impurities and quenching when coal is burned at high temperature. The main chemical composition of fly ash is Al 2 o 3 and SiO 2 , the sum of the two amounts to more than 80%. Comprehensive utilization of fly ash to extract alumina is a high value-added utilization of secondary resources. The research has shifted from theoretical and experimental research to pilot and industrial test research, but the technical routes available for industrial production are still very limited. [0003] The alkali roasting method has made some progress in industrial application due to its simple process, but because of its inherent defects, the whole process...

AI Technical Summary

Problems solved by technology

[0003] The alkali roasting method has made some progress in industrial application due to its simple process, but because of its inherent defects, the whole process is immature or uneconomical, making production unsustainable; Corrosion requirements are high, the investment cost is huge, and the research has been in the theoretical and laboratory stages, and the road to industrialization is still relatively long; while the ammonium sulfate method, which has a relatively mild reaction and can control the amount of slag, has not yet realized industrial production, mainly because the process It has been unable to solve the problem that ammonium sulfate and fly ash are mixed and roasted to produce aluminum sulfate or ammonium aluminum sulfate. The melting point of ammonium sulfate and ammonium aluminum sulfate is low, and they will quickly form a molten state during the reaction process, and ammonium sulfate is easy to decompose , after decomposition, it will not be able to combine with Al in fly ash 2 o 3 react, resulting in Al 2 o 3 The extraction rate is not high

[0004] China Huaneng Group Clean Energy Technology Research Institute in its 1MW th The circulating fluidized bed combustion test bench has carried out experimental research on the extraction of alumina by the ammonium sulfate method. The results of the research show that the fluidized roasting of the ammonium sulfate method for alumina extraction is conducive to uniform heat transfer and faster reaction of the material, but in the test bench conditions If the material enters the furnace for 5 minutes, it is completely ground by the inert medium, and the material stays in the lower part of the furnace for a short time, which cannot meet the requirements of the roasting time, resulting in a low extraction rate.

Images