SU1732130A1 - Conveyer machine for roasting raw pieces - Google Patents

Abstract

This invention relates to the preparation of raw materials in the steel industry. The conveyor machine contains a drying section with a drying agent supply hood, a high-temperature processing section with heating furnaces for producing weakly oxidizing or neutral gas and a cooling section, it is equipped with two cut-off chambers with a reducing or neutral gas pressurization system, one of which is located behind the drying section and the other - at a distance of 0.45 - 0.65 of the length of the machine from the first and divides the section of high-temperature processing into two sections - the section of the semi-coking soaking section and the decarbonization section of The application of the invention allows to increase the intensity of heat treatment of pellets by 45-50% and increase the degree of extraction of shale resin. 1 il. cl

Description

The invention relates to the use of combustible shale, namely, agglomeration and the subsequent redistribution of waste products - shale shredded fines.

The purpose of the invention is the expansion of technological capabilities due to the simultaneous extraction of shale resins during firing pellets from energy shale.

The drawing shows a schematic diagram of a conveyor machine for the day of firing pellets from energy shale, a longitudinal section.

The machine contains a drying section 1 with a drying agent supply cap 2, a high-temperature processing section including section 3 semi-coking with heating mountain 4 and system 5 for the production of process gas and decarbonization section 6 with heating mountain 7, cooling section 8 and cut-off chambers 9 with system 10 supercharging reducing or neutral gas. One cut-off chamber is located behind the drying section, another one behind the semi-coking section at a distance of 0.45-0.65 the length of the machine from the first. System 5 turns on the VJ fuel burner

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The device 11 and the nozzle 12 of the supply of neutral gas.

Conveyor machine works as follows.

After shredding, shale fines are fed to the granulators and raw pellets with a grain size of 10–12 mm are obtained. The pellets are loaded onto the machine and sequentially dried, semi-coked, decarbonized and cooled in sections 1, 3, 6 and 8, respectively. In the drying section, the coolant is fed to the cap 2, from there 1 is filtered through the layer to be dried from top to bottom and is dropped from the system. Then, the pellets pass under the first shut-off chamber, fill the interstitial pores with neutral gas, and enter section 3 of the semi-coking. In system 5 of this section, generator gas is burned in devices 11 with an air flow rate of 1.05, diluted with water vapor, if necessary, through the nozzles 12, the resulting mixture with a temperature of 750 ° C and an oxygen content of 0.2% is fed to the hearth 4 From there, they are filtered from top to bottom through the processed layer of pellets, the shale resin is recovered, and in a gas stream through the vacuum chambers it is removed to condensation. From section 3 of the semi-coking, the folding passes under the second cut-off chamber and enter section 6 of the decarbonization. In the burners of the furnace 7 of this section, the fuel is burned at an air flow rate of 2.4, the resulting coolant with a temperature of 1000t; C is filtered downwards through the bed, decarbonating it, and removed from the system through vacuum chambers.

Gas-generating fuel is supplied to shut-off chambers 9 through system 10, pressure of 0.5-1.5 kg / m is maintained in chambers 9, the semi-coking chamber is securely locked by organized flow of a limited amount of gas from chambers 9 to horn 4, the gas is filtered through the layer from top to bottom , thereby providing an additional impact on the development of thermal processes in the layer. Exhaust gases are included in the stream of exhaust gases from sections 3 and 6 of the exhaust gases and after cleaning (from tar and other things)

include, for example, in the main collector gas generating fuel.

After section 6, the pellets in section 8 are cooled. The distance between the cut-off chambers, equal to the length of the section-semi-coking section, is set within 0.45-0.65 of the total length of the conveyor machine. With a shorter exposure section (less than 0.45 length

0) occurs either due to the lack of time to reduce the recovery of shale resin from the pellets, or due to a decrease in the speed of the machine to complete the process of extracting the resin,

5 excessive residence time of the pellets in the remaining sections and, accordingly, a decrease in the productivity of the machine. With a longer shutter section (more than 0.65 machine length), the resin sublimation process is completed prematurely and

In addition to reducing the productivity of the machine, the resin is further contaminated and, as a result, the degree of its extraction is reduced.

The application of the invention allows

5 to include in the processing volume an additional 70% of the extracted oil shale, to increase the intensity of their heat treatment, and to increase the degree of shale resin recovery by 45-50%,

Claims (1)

Formula of invention Conveyor machine for calcining pellets, containing a drying section with a drying agent supply hood, a high-temperature treatment section with heating 5 by furnaces for the production of a weakly oxidizing or neutral gas and a cooling section, characterized in that, in order to expand technological capabilities by means of associated extraction 0 shale resins during firing pellets of energy shale, the machine is equipped with two shut-off chambers with a system of pressurization of reducing or neutral gas, one of which is located behind the drying section, and the second - at a distance of 0.45-0.65 the length of the machine from the first and divides the high-temperature processing section into two sections - the section-semi-coking section and the decarbonization section. cvj