RU2035232C1 - Production line for dry ground material - Google Patents

Abstract

FIELD: construction materials industry. SUBSTANCE: production line is provided with receiving hopper, plate-type feeder, furnace, fan, a group of cyclones, filter, smoke exhauster, elevator, disintegrator, conveyers. A jaw crusher and combined dryer are mounted between the plate-type feeder, group of cyclones and elevator. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to processing lines for the production of dry ground material, mainly from a lamellar paste-like material, and can be used in the building materials industry and in the feed mill, for example for the production of building or mixed feed chalk.

 A known production line [1] including a roll crusher, a storage hopper, a screw feeder, a rotary dryer loading device, a furnace, a hammer mill for the final grinding of material dried in a rotary dryer.

The disadvantages of the line are the impossibility of taking a roll crusher to crush large pieces of material with a size of 150-200 mm and its coating and clogging of its working bodies with a moisture content of the source material of more than 25%
A known production line [2] consisting of a receiving hopper of raw materials and a hopper of a dry ground product, a vibrating feeder, a plate feeder, a calibration device, a rotary dryer with loading and unloading nozzles, a furnace, a group of cyclones, a filter, a smoke exhauster, a disintegrator, a fan.

 Disadvantages of the line: low reliability and inefficiency of crushing in the device for calibration; inefficiency of drying material in a rotary crusher; the absence of a separation process in the production line for the removal of part of the finished product before grinding.

 A known line for the production of dry ground material [3] In the rotary dryer there are no elements for separation, ie to withdraw from it already parts of the finished product (dried particles with a size of 0-0.4 mm). This leads to the fact that particles of 0-0.4 mm from the rotary dryer enter the disintegrator and are crushed, as a result, the quality of the dry ground material deteriorates.

 The aim of the invention is to increase the productivity of the line and improving the quality of dry ground material.

 This is achieved by the fact that the proposed line for the production of dry ground material containing a feed hopper of a raw material, a plate feeder, a furnace fan, a group of cyclones, a filter, a smoke exhauster, an elevator, a disintegrator, screw conveyors, differs in that between a plate feeder, a group of cyclones and an elevator in the technological Sequences installed jaw crusher and combined dryer.

 In FIG. 1 shows a line for the production of dry ground product; figure 2 design of a combined dryer.

 The line for the production of dry ground product contains a hopper 1 of the feedstock, a plate feeder 2, a jaw crusher 3, a fan 4, a furnace 5, a gas duct 6, a combined dryer 7, a disintegrator 8, a group of cyclones 9, a filter 10, a smoke exhauster 11, a chimney 12, screw conveyors 13 and 14, elevator 15.

 The combined dryer consists of a Venturi pipe 16, a separation wall 17, a separation zone 18, a gas distribution grid 19, a coolant supply section 20, a discharge gate 21 with a counterload 22, a lock feeder 23, a lock unloader 24, a gas outlet 25.

The line for the production of dry ground product operates as follows. Wet source material from the hopper 1 with a plate feeder 2 is fed for crushing in a jaw crusher 3, where it is crushed without regrinding to a particle size of 0-15 mm. From the jaw crusher crushed material sluice feeder 23 is loaded into the throat of the venturi 16. The heat medium having a temperature of 600 ^{° C} from the furnace through flue 5 6 enters the coolant inlet section 20 and sent to the venturi tube 16 and the grating 19 to the gas (air for combustion and dilution of the coolant is supplied from the fan 4).

 High relative speeds and temperature pressures are realized in the Venturi pipe, which contributes to intensive dispersion, heating and drying of the material particles, the material in the Venturi pipe is dried to a moisture content of 8%. The waste heat carrier flow with particles of material in the form of a gas suspension leaves Venturi pipe 16 and begins to bend around the separation wall 17, while through the louvre shutters there is a suction of 18 servings of waste heat carrier into the separation zone together with thin particles of material (0-0.4 mm) that form the finished product .

 As the separation wall 17 bends around due to the constant removal of portions of the coolant through its louvers, the weight concentration of the gas suspension increases, which contributes to the complete deposition of the entire mass of material (class 0.4-15 mm) on the gas distribution grid 18. Fresh portions of the heat transfer agent flowing out of the gaps of the gas distribution grid 19 (for example, rod type), transfer the material to a fluidized bed, in which the material is dried to a final moisture content of 1%. The gas velocity in the fluidized bed and in the separation zone is 18 etsya so that a fluidized bed of particulate material imposed 0-0.4 mm, which form the finished product. Thus, the separation in a fluidized bed allows you to select the finished product from the mass of the material to be dried and to exclude its possible regrinding in the disintegrator 8.

 Fine particles 0-0.4 mm removed together with the waste coolant flow in the separation zone 17 are freed from larger particles randomly removed from the fluidized bed, and are transported through the nozzle 25 to the group of cyclones 9. In the group of cyclones, the cleaning efficiency is such that practically particles larger than 50 microns (0.05 mm) are captured up to 92%, i.e. in the group of cyclones, the finished dry ground material with a particle size of 0.05-0.4 mm is released, which is fed by a screw conveyor 13 to the conveyor 14. From the group of cyclones, the coolant flow is sent to the filter 10 for sanitary cleaning, then by the exhaust fan 11 through the chimney 12 emitted into the atmosphere. Fine dust trapped in the filter 10 is discharged to the dump.

 The material dried on the gas distribution grid 19 presses on the discharge gate 21 and is discharged from the combination dryer through the lock unloader 24. By means of the counterweight 22, it is possible to provide the required degree of compression of the discharge gate 21 and thereby indirectly control the residence time of the material in the fluidized bed for its high-quality drying and separation.

 From the combined dryer 7, pieces of material 0.4-15 mm are fed by the elevator 15 to the disintegrator 8 for grinding. The material ground in the disintegrator is a finished dry ground material and is conveyed by a screw conveyor 14 to a finished product warehouse.

 The use of the inventive line in the production of building or feed chalk will increase the productivity of the line in 1.7-2.0 times.

Claims (1)

 LINE FOR PRODUCTION OF DRY MILLED MATERIAL, containing a receiving hopper of raw materials, a plate feeder, a furnace, a fan, a group of cyclones, a filter, a smoke exhauster, an elevator, a disintegrator, screw conveyors, characterized in that, in order to increase the productivity of the line and improve the quality of dry ground material, between the plate feeder, a group of cyclones and an elevator, a jaw crusher and a combined dryer are mounted in the technological sequence.

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