SU1747167A1 - Plant for grinding of materials at low temperatures - Google Patents

Abstract

Usage: equipment for processing secondary material resources. SUMMARY OF THE INVENTION: The installation comprises a hopper 1 with a conveyor 2. Through the dispenser 3 and the sluice gate 4, the conveyor 2 is connected to the upper part of the cooler bunker 5. The latter is connected to the chopping device 8. The installation contains a cooling unit in the form of a bath 13 for liquefied gas with an integrated heat exchanger 14 and the ejector 15. The active nozzle of the ejector 15 is connected to the steam cavity of the bath 13, and the passive nozzle - to the outlet of the heat exchanger 14. The nozzle of the mixed flow is connected to the flow pipe 19 of the circulator circuit ui Pipeline 19 is connected through a receiving device 9 to a grinding device 8. A pipe 31 connected to an annular collector 33 located in the lower part of the hopper 1 is connected to the upper part of the cooling bin 5. 1 Il.

Description

The invention relates to the recycling of secondary material resources, in particular out-of-service tires and other rubber scrap.

The purpose of the invention is to increase reliability and efficiency by reducing the consumption of liquefied gas.

The drawing shows a diagram of an installation for grinding materials at low temperatures.

The installation contains a hopper 1 with a conveyor 2, connected through a dispenser 3 and a sluice gate 4 to the upper part of the cooler hopper 5, which through a dispenser 6 and a sluice gate 7 is connected to a grinding device 8. The grinding device 8 is equipped with a receiving device 9 for gas and connected

with a hopper 1-0 through the expander pipeline 11. At the bottom of the cooler hopper 5, an annular manifold 12 is installed. The installation also contains a cooling system in the form of a circulation loop containing a cooling unit in the form of a bath 13 for liquefied gas with an integrated heat exchanger 14 and the ejector 15, the active nozzle of which is connected via a pipe 16 with a regulating valve 17. To the steam cavity of the bath 13t, the passive nozzle by means of the regulating valve 18 is connected to the outlet of the heat exchanger 14, and the nozzle is mixed flow to the supply pipe 19 of the circulation loop. The other end of the pipe 19 through the control valves 20 and 21 are connected respectively to the annular manifold 12, located in

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bunker-cooler 5, and through the receiving device 9 - to the grinding device 8.

The circulation circuit, in addition to the supply pipe 19, contains a discharge pipe 22, which is connected at one end through a control valve 23 to the upper-heel of the bunker-cooler 5, and the other through the receiving hopper 10 to the entrance to the heat exchanger 14. For this, in the lower part The hopper 10 houses an annular collector 24, and in the upper part, a branch pipe 25 connected to pipeline 22. For supplying liquid nitrogen, the bath 13 is equipped with a pipe 26 with a valve 27.

For delivering the finished material, the receiving bin 10 is provided with a shutter 28 and a packaging container 29 with a filter 30. A pipe 31 is connected to the upper part of the cooling bin 5 with a valve 32, which is connected to the annular collector 33 located at the bottom of the loading hopper 1.

The installation works as follows.

The source material (MI) conveyor 2 is fed into the hopper 1, from where dispenser 3 through a sluice gate 4 into the cooler-cooler 5, where it is cooled by the cooled gas (nitrogen) flowing through the annular collector 12 below the temperature of the source material. For example, when using nitrogen, the temperature of its gaseous phase is (-1801-170) ° C.

From the bunker, the cooled MI dispenser 6 through the sluice gate 7 is fed to the grinding device 8, and from there the crushed material of the desired fraction with cold gas is blown through the expander pipeline 11 into the receiving bin 10, in which the crushed particles accumulating in the lower part of the receiving bunker 10 are separated. from cold gas. From the receiving bin 10, the crushed material enters the packaging container 29 through the discharge valve 28. The crushed material is supplied by a small excess gas pressure in the receiving bunker 10. From the packaging container 29, the excess gas pressure through the filter 30 is released into the atmosphere.

The cooled gas into the annular collector 12 of the bunker-cooler biv grinding device 8 enters through the pipe 19 and the control valves 20 and 21 from the heat exchanger 14. The supply of the cooled gas to the circulation loop with

The overpressure is carried out by the ejector 15, the active stream of which is the gas generated in the vapor space of the bath 13 due to the heating of the liquid during the passage of warm gas through the heat exchanger 14. High-pressure gas from the vapor space of the bath 13 through the pipeline 16 and the control valve 17 is directed to the active ejector nozzle 15.

From the annular manifold 12, the cold gas enters the bottom of the cooler hopper 5, and the raw material cooled by this gas flow is lowered and the dispenser 6 is fed to the grinding device 8.

The gas heated in cooler-cooler 5 is supplied from its upper part through pipe 22 to valve 23 to the lower part of receiving hopper 10, where the passage through the still cold end fraction of the crushed material is cooled and simultaneously heats the final product discharged through outlet shutter 28.

In the upper part of the receiving hopper 10, the cooled gas is mixed with the gas supplied with the crumb from the chopping device 8, and through pipelines 25 and 22 enters the entrance to the heat exchanger 14 and then goes through the valve 18 to the passive nozzle of the ejector 15.

The excess gas from the upper part of the cooler-cooler 5 through pipe 31, the control valve 32 and the annular manifold 33 falls into the lower part of the hopper 1 and. passage through the source material, dries it, pre-cools and exits to the atmosphere.

The invention makes it possible to significantly reduce the consumption of liquefied gas in the process of cryogenic grinding, since they are determined only by the insulation quality of the cooling system, the amount of thermal power supplied by the grinding device, and a slight underrecovery (10-15 °) of the heat exchange devices of the cooling system. This allows a 2-3 times reduction in the consumption of liquefied gas in the process of cryogenic grinding of the material.

Claims (2)

1. An apparatus for grinding materials at low temperatures, including a series-connected hopper, a cooler hopper, a chopping device, a hopper and a cooling system containing a circulation loop with a cooling device made in the form of a liquefied gas bath and connected to the lower part of the cooler bunker, the chopping device and the upper part of the cooler bunker, and the gas discharge pipeline from the bunker cooler, which in order to increase reliability and efficiency by reducing the flow of liquefied gas, bath for liquefied gas equipped with a built-in heat exchanger, and the cooling system is equipped with an ejector, 1 active nozzle of which is connected to steam the vial space is passive to the outlet from the heat exchanger, and the mixed flow nozzle to the lower part of the cooler bunker and the grinding device, while the outlet from the upper part of the cooler cooler is connected to the inlet of the heat exchanger through the receiving hopper. 2. Installation popl.otlichayuscha - so that the pipeline discharge of gas from the bunker-cooler is connected to the bottom of the hopper.