SU768427A1 - Electromagnetic granular filter - Google Patents

Description

(54) ELECTROMAGNETIC GRAIN FILTER

one

The invention relates to ferromagnetic granular filters and can be used in the metallurgical industry for cleaning dusty gases of blast furnaces and open-hearth furnaces and for utilizing the heat of these gases.

The electromagnetic polygraphic filter is known, which includes a body covered by a solenoid and a layer of a ferromagnetic packing that separates the corus along the gas flow into two compartments 1.

A disadvantage of the known filter is the absence of dry regeneration of the granular material and the recovery of heat from the flue gases.

The aim of the invention is to achieve polygraphic magnetic separation of ferromagnetic dust contained in dusty gases, with utilization of their heat and continuous dry regeneration of granular material, while reducing the path of the material from the polygradient separation of dust to the zone of its regeneration.

The goal is achieved by the fact that in an electromagnetic polygraphic filter that includes a case covered by a solenoid and a layer of ferromagnetic attachment dividing the case along the gas movement into two glasses, the magnetic circuit separated by a magnetic gap is inserted into the layer, the upper part of which is made in the form of ferromagnetic rods attached to ferromagnetic pipes, through which 5 pass the heated gas (or liquid), and the lower - in the form of hollow ferromagnetic plates with gaps through which the dusty gas is fed into the layer, m rows of pins are offset relative

10 plates, which in the lower part are connected to a common collector, and between which are placed the branch pipes, which discharge the dense layer of the ferromagnetic attachment, the solenoidol covered in the lower part and the inclined ferromagnetic plate located under it, made in the form of an element of the external magnetic circuit of this solenoid.

FIG. 1 shows a general view of an electro20 magnetic particulate filter; in fig. 2 - section A-A of FIG. one; in fig. 3 - section B-5 of FIG. one.

The filter includes a housing / in which there is a fluidized bed

25 of the ferromagnetic dispersed material 2, bhvnah solenoid 3, having an internal magnetic conductor, made in the form of ferromagnetic rods 4, located above the hollow ferromagnetic plastics 5, connected to the collector 6,

Ferromagnetic nozzles 7 are passed through the collector for removal of dispersive material. These nozzles are covered by a solenoid 8 with magnetic conductor P. At the bottom of the filter there is a hopper 10 for collecting dust. Solenoid 3 also contains an external magnetic circuit //. In the upper part of the filter, under the layer of dispersed material there are consecutively arranged pipes 12 for supplying dispersed material to an inclined tray 13 that intersects the pipe 14 for draining cleaned gas. Behind the nozzles 7 in the course of the granular material are located the electromagnet 15 and the lattice ./5. In the bunker 10 there is a hatch 17 through which the accumulated dust is removed. A manifold 18 is attached to the collector 6 for supplying a poured gas. A portion of the dusty gas with a temperature of about 800 ° C is led through conduit 19 to bunker 20 and is used to carry out pneumatic conveying of the regenerated material 2. The bunker 20 and the casing are interconnected by an inclined tray 13. Under the bunker 20 there is an electromagnet 21. Under the tray 12 there is electromagnet 22.

Electromagnetic granular filter works as follows.

Dust gas through pipe 18 enters the collector 6 and through hollow ferromagnetic pipes 7 enters the layer of granular ferromagnetic material 2, crosses the magnetic gap formed between the plates 5 and the rod lsh 4, then passes through a fluidized bed of ferromagnetic granular material 2, shielded from magnetic field by the rods 4, and is removed through the nozzle 14. The medium material 2 flows from the inclined tray 13 through the nozzle / 2 into the fluidized bed washing the surfaces of the magnetic flux 4, and crossing the small the gap between the plates 5 and the rods 4, in the area outside the gas jets, after which it passes through ferr.a. magnetics to the lower inclined surface of the magnetic conductor 9 covering the solenoid 8 and flows onto the slope of the grid 16. Solenoid 8 serves to smoothly control the speed of removal of the material through the nozzles 7. The material can be continuously withdrawn — then its speed is regulated by changing the intensity of the magnetic field of the solenoid 8, intermittently — then the amount of the removed material is regulated by frequency and With a pulsed current supplying the solenoid 8. On the aclon lattice, the material is vibrated by the magnetic field of the electromagnet 15, while the grate can be stationary, but if necessary, it can be vibrated by means of a solenoid 8 operating in pulsed mode. Prn shaking material 2 pulsed magnetic field frequency from 1 to 5 Hz, pulse duration T4 0.01 sec ferromagnetic dust is separated from the granular material and deposited in a sealed hopper 10. The winding of the electromagnet 15 simultaneously with a source of pulsed current

connected to a source of weak alternating current, which creates an additional component of intensity - a variable in direction and equal in magnitude to the coercive force. This is required for

demagnetization of dust and granular material. The regenerated material enters the pipeline 19, and through it into the hopper 20, where it forms a flowing layer. The solenoid 21 serves to regulate the resistance of the spouting layer from which material 2 is returned to the housing /. The possibility of implementing pneumatic conveying with dusty gases is based on the following data. At the Minsk Tractor Plant, dusty gases from each of the eight furnaces in the foundry contain a maximum amount of dust of 1 g / m with a gas consumption of 35,000. No more than 100 required for pneumatic conveying,

which leads to a decrease in cleaning efficiency of less than 0.3%. The electromagnet 22 serves to automatically control the speed of the material supply to the fluidized bed, in order to maintain its

height and resistance (not more than 150 mm) at a given level. In this filter, flocs. There is no ferromagitic material in the fluidized bed, and polygradient magnetic separation

ferromagnetic dust (fig. I) goes in a narrow magnetic gap formed by ferromagnetic rods - magnetic conductors, closing a magnetic flux, so that between them there is a magnetic field

almost nonexistent, and the bed is in a slightly inhibited fluidized state. There is an intensive heat exchange between the fluidized bed and the elements of the magnetic core, which are simultaneously the fins of the heat exchanger. The upper and lower parts of the magnetic circuit are displaced so that in the magnetic gap between them are formed on-clone ferromagnetic layers, through which

gas is filtered. In this case, part of the dust sits on the rods x 4 and plates 5, and some in interlayers. When the magnetic field is periodically interrupted for 5–10 seconds for a time of 0.1 seconds, the dispersed material, moving from top to bottom, washes the rods and plates, captures coagulated dust deposited on them, and falls into the dead zone, outside the gas jets. The material moves through the magnetic gap.

top down continuously.

Claims (1)

1. V. V. Leonov. Investigation of Electromagnetic Fields in Homogeneous and Inhomogeneous, Linear and Nonlinear Media (as applied to elements of purification devices), PhD thesis, Zhdanov, 1974. 6 - S A-A u2 TO