SU1527462A1 - Installation for producing claydite sand and dehydrated clay powder - Google Patents

Abstract

The invention relates to the building materials industry, to the preparation of expanded clay sand and dehydrated powder, which makes it possible to combine raw material processing operations in one installation and reduce the emission of dust into the atmosphere. The feedstock conveyed by the hot gases is carried to the gravity separator 5, sorted by fraction, and successively passes through the drying chamber 6, firing 7 and cooling 8. The operating mode in the chambers is regulated by a damper. In apparatus 9 and 10 of coarse and medium purity, the product is divided into fractions. The fine material is fed to a wet-type dust collector 29 for wet cleaning, the resulting slurry by pump 30 through nozzles 34 is fed to a gravity separator. 1 hp f-ly, 2 ill.

Description

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The invention relates to the building materials industry, in particular to the preparation of expanded clay sand and dehydrated clay powder.

The aim of the invention is to combine the processing of raw materials in one installation and reduce the emission of dust 3 atmosphere.

FIG. 1 is a schematic of the installation in FIG. 2 shows the construction of a fluidized bed chamber.

The plant for preparing expanded clay sand and dehydrated clay powder contains a feed supply conveyor 1, a hot gas injection unit 2, a chute 3, a hammer mill 4, a gravity separator 5, a drying chamber 6, a roasting chamber 7, a cooling chamber 8, a coarse-cleaning apparatus 9, an apparatus 10 medium cleaning, conveyors 11 and 12, suction covers 13 and, gas ducts of dusty air 15-20, gas flow regulators 21-25, fans 26 and 27, heat exchanger 28, wet-type dust collector 29, solenoid valves 31-33, injector 3, gas ducts 35-37 clean air pipe 38.

The fluidized bed chamber consists of a raw material receiving zone 39, a gas inlet unit tO, a firebox 41, a burner 42, a fluidized bed zone 43, a partition wall kk, a control valve 45, a blower 46.

The installation works as follows.

The clayey raw material together with the solid fuel conveyor 1 along the chute 3 is fed to the grinding in the mill 4. At the same time, hot gas is supplied to the mill 4 from the unit 7. The raw materials and solid fuels in the mill are ground and flue gases are carried to a gravity separator 5, in which they are sorted by size; A given fraction of the powder rises with the gas flow upwards, and the particles of the raw material with a size of more than a given size under the action of their own weight are lowered onto the grinding in the mill.

The gas flow rate in the gravity separator is regulated by the gas flow regulator 23 installed on the gas duct 18, behind the 1P medium cleaning unit. From the gravity separator 5 dust and gas flow enters the duct 20, located above

drying chambers 6, firing 7 and cooling of the material 8. When the flow passes over the drying chamber 6, the flow rate decreases due to expansion of the flue section, resulting in powder-gas flow falling into the receiving zone 39, going down and through the gap between the partition and node 40 the gas inlet enters the boiling bed chamber 43, into which hot gas generated by the combustion of fuel in the burner 42 is fed through the gas inlet 40 from the furnace 1.

At the same time, the blower 6 in the furnace 41 is supplied in the required amount of air.

The speed of the upward flow in the chambers of the bedding layer: in the drying chamber 0.55-0.65 m / s, in the firing chamber 0.65-0.75 m / s.

Accordingly, the temperature is 200-250 ° C and 1050-1 100 ° C for firing and 550 650 C for dehydration.

The cooling chamber 8 is blown with atmospheric air. The thickness of the fluidized bed ranges from 400 to 800 mm.

The gas that enters the fluidized bed zone pseudo-liquefies the powder, which, as it accumulates, flows into the next chamber along the motion for further processing.

To stabilize the operation, the boiling bed zone 43 is separated from the raw material receiving zone 39 by a partition 4 4, which has a control valve 45 at the top, which regulates the flow of gas supplied with the powder from the raw material receiving zone 39 to the boiling bed zone 43.

After the passage of all successively installed fluidized bed chambers, the finished product, together with the dust-gas flow passing over chambers 6-8 through the gag- / run 20, enters the dust precipitation system. In the rough cleaning apparatus 9, a large product is separated and conveyed by the conveyor 11 to its intended purpose, in the medium cleaning apparatus 10, a medium-sized product is separated and conveyed by the conveyor 12 to the destination.

The thin product is deposited in the wet-type dust collector 29, which is formed by the slurry by the pump 30 through the nozzles 3 in a finely dispersed form and is fed into the upper part of the gravity separator. In contact with the particles of dust and gas flow, the atomized slurry forms granules suitable for the production of expanded clay sand.

In order to stabilize the operation of the firing chamber, one suit of heat is used for firing from the furnace through the gas inlet unit, and the other is formed in the firing zone 43 of the burner by the combustion of solid fuel additives in the raw material.

Drying and burning of the material produces a large amount of moisture in the form of steam and heat. The vapor, the passage through the wet-type dust collector 29, condenses in the water in the dust collector, and the heat through the heat exchanger 28 is softened, heats the passage of the air through the heat exchanger, which by the fan 26 and the gas ducts 35-37 of clean air is directed to gravity separator 25 and drying chamber 6 for drying the material. The regulation of the flow of clean air is carried out by regulators 2 and 25 installed on gas ducts 3b and 37.

To prevent dust from escaping into the atmosphere, the conveyors 11 and 12 of the finished product are equipped with aspiration shelters 13 and 4, from which dust is sucked from under which is carried out with the help of a fan 27. The discharge of dust from the gas flowing through the system is controlled by Regulators 21–29 of the consumption of dusty gas, installed by Vna gas ducts 15–17.

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When temporarily shutting down under installation into the installation, the feed of the slip and the gravity separator also cease,

Claims (2)

1.Installation for r: tototalize claydite sand and tar sanding powder, including a raw materials conveyor, a mill, a gravity separator, a furnace for the supply slot, a hot gas injection unit, a dust precipitation system, a flue air gas duct, different By the fact that, in order to combine the processing of raw materials in one installation and reduce dust emission into the atmosphere, the separator is equipped with nozzles for introducing the slurry into the gas flow, the fluidized bed furnace is installed between the gravity separator and the dust precipitation system and It is made in the form of identical chambers placed in series, each of which is divided into zones of a bottom not reaching the bottom with an EiBepxy control valve. 2. Installation under item 1, characterized in that it is equipped with a heat exchanger mounted on the dusty air duct. Fi8.g