SU1273714A2 - Apparatus for burning polydisperse material in fluidized bed - Google Patents

Abstract

In order to increase operational reliability and reduce pulverization in the apparatus for burning polydisperse material in the fluidized bed, each cyclone located inside the working chamber is equipped with a coocHt with a pipe installed inside it connected to an air duct with a blower fan, the pipe diameter being 0.3 The diameter of the cyclone outlet is 0.6 and the distance from the cut pipe to the end of the outlet is 1.3-2.5 times the diameter of the latter. 1 il.

Description

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The invention relates to devices for calcining a polydisperse material, can be used in the production of building materials, as well as in the chemical, metalurgic and other industries and is an improvement of the invention according to the author. No. 836478.

The purpose of the invention is to increase reliance in work and reduce dust emission.

The drawing shows the proposed apparatus, a longitudinal section.

In the apparatus for burning a polydisperse material in a fluidized bed, each cyclone located inside the working chamber is provided with a pipe coaxially installed inside it, connected through an air duct to a blower fan, the pipe diameter being 0.3-0.6 times the diameter of the cyclone outlet branch pipe The distance from the pipe edge to the end of the outlet pipe is 1.3-2.5 times its diameter.

The coaxial installation inside each cyclone of an additional pipe with a diameter of 0.3-0.6 of the outlet diameter of the material of the pipe connected to a blower fan, allows you to create an air jet sufficient to prevent arborization of the particles and clogging of the output of the cyclone pipe through the material as well as an obstruction to the flow of ascending smoke gases.

With a smaller pipe diameter, less than 0.3 of the diameter of the outlet nozzle, the air jet power is insufficient to overcome the oncoming upward flow of flue gases. With an increase in the pipe diameter of more than 0.6 of the diameter of the cyclone outlet nozzle, an air jet is struck against the conical part of the cyclone with the formation of vortices that prevent the normal release of deposited particles from the nozzle.

Placing the pipe cut-off at a distance from the end of the outlet pipe over the material equal to less than 1.3 or more than 2.5 diameters of the latter, does not allow eliminating the possibility of flue gases bursting through the cyclone outlet pipe and at the same time avoiding collisions of particles dispersed by the air jet on the wall of the outlet pipe, which would lead to its rapid abrasive wear.

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The apparatus comprises a working chamber 1, inside of which there is a gas distribution grid 2, a furnace 3 with a burner 4, a device 5 for feeding material to the calcination and a device 6 for removing the calcined material from the chamber. Inside the working chamber, high-temperature cyclones 7 are installed in series with the inlet pipe 8 and the material outlet pipe 9, partitions 10 attached to the bottom of the cyclone 7 by the hinge 11 and not reaching the gas distribution grid. In the inner pipes 12 cyclones 7, combined by a collector 13, additional pipes 14 coaxially are installed, connected by a duct 15 to a blowing fan 16.

The diameter of each additional pipe is equal to 0.3-0.6 of the diameter of the outlet pipe over the material, and each additional pipe is installed at a distance from the end of the outlet pipe to a pipe cut 1.3-2.5 times the diameter of the outlet pipe.

The device works as follows.

The polydisperse material is fed through the device 5 into the working chamber 1, where it is liquefied by the flue gases coming from the furnace 3 through the gas distribution grid 2. Large particles in the fluidized bed, moving through the gas distribution grid 2 to the device 6, are heated to the expansion temperature. Psevidnye particles are removed from the boiling bed with flue gases and together with them enter the cyclone 7 through the inlet 8. The fan 16 through the duct 15 supplies air and additional pipes 14. Additional pipe 14 together with the conical part of the cyclone.

forms a jet ejector. The air jet coming out of the additional tube 14 ejects dust particles sliding along the conical part of the cyclone and feeds them into the next temperature zone. Flue gases cleared of dust particles through the collecting collector 13 are discharged from the apparatus.

The use of the proposed apparatus makes it possible to reduce the dust content of flue gases, to increase the reliability of operation and the productivity of the apparatus.

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The formula of the pipe inside it is connected to a device for firing polydisperse through an air duct with a vengov blowing material in a fluidized bed by means of an autoclave, the diameter of the pipe being

EV "No. 836478, characterized by a diameter of 0.3-0.6 diameter output so that, in order to increase the reliable j-pipe of the cyclone, and the distance

tee in work and reducing pshcheunos, from cutting the pipe to the end of the output

each inside the workpipe is 1.3-2.5 dia.

Camera cyclone fitted coaxially set-last.

Claims (1)

The claims of the invention apparatus for firing a polydisperse material in a fluidized bed according to ed. St. No. 836478, characterized in that, in order to increase operational reliability and reduce peeunos, each cyclone located inside the working chamber is equipped with a pipe coaxially mounted inside it, connected through an air duct to a blower fan, the pipe diameter being 0.3-0 , 6 diameters of the outlet of the 5th cyclone nozzle, and the distance from the pipe edge to the end of the outlet nozzle is 1.3-2.5 of the diameter of the latter.