Gas lower exhaustion type whirlwind air-solid separator

Abstract

The invention relates to a down-discharge cyclone gas-solid separator, which comprises inlet tube (1), divert rod (2), cylinder (3), discharge tube (4) and incline ash hopper (5). Wherein, said discharge tube is inserted into the cylinder for D0 length, while the inserted section has small hole (6) that distributed in triangle and at 5-10mm diameter; the area sum of all small holes are equal to the inlet area of discharge tube; the inner diameter of cylinder is D0, while the width of inlet is 0.22D0-0.35D0 and the height is 0.44D0-0.75D0; the diameters of divert rod and the discharge tube both are 0.5D0, while the distance between their tops is 0.5-1D0; the incline angle of incline ash hopper is 50-75degree; therefore, the flow file of diverter is more reasonable, to reduce the secondary transmission of fly ash, improve the separating efficiency and reduce the resistance. The invention can be used to separate the fly ash in the tail smoke of boiler, etc.

Description

technical field [0001] The invention belongs to a gas-solid separation device for fly ash entrained in gas, in particular to the separation of fly ash entrained in flue gas in the tail flue of a circulating fluidized bed boiler converted from a pulverized coal boiler, and in the tail flue of a newly built circulating fluidized bed boiler. Separation of fly ash entrained in flue gas, and separation of fly ash entrained in gas produced after coal and biomass circulating fluidized bed gasification. Background technique [0002] In the structural layout of boilers and circulating fluidized bed gasifiers, the traditional cyclone separation device makes the entire boiler and gasifier bulky due to the direction and support of the flue gas. The lower exhaust separator itself is equivalent to a turning flue. This arrangement not only completely matches the flow of flue gas or coal gas, but also enables the incompletely reacted fly ash to be separated and conveniently enter the boiler...

AI Technical Summary

Problems solved by technology

However, after analyzing the model of the lower exhaust separator and the cold model test, it is found that the design of the exhaust pipe above the inclined cone at the bottom is not very reasonable, and the ash ring formed on the inner wall of the separator cylinder slides into the inclined ash hopper During the process, due to the sudden turning of the airflow, the ash ring and the tangential velocity of the airflow attenuate greatly, resulting in airflow turbulence, which affects the ash ring entering the inclined ash hopper and is swept away by the airflow to generate secondary entrainment at the bottom, making the fly ash The separation efficiency is affected

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