SU1122681A1 - Method for smoke-less charging of coking ovens with thermally prepared coal charge - Google Patents

Description

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The invention relates to coke production, in particular to methods for loading horizontal coconuts. furnaces thermally prepared coal charge.

In coke production, the process of coking thermally prepared coal charges, previously dried to a moisture content of less than 4% and heated to 220-240 C, is becoming more and more common. The advantages of coking thermally prepared charges are as follows: an increase in coke oven productivity, a shorter coking period, and humidity charge, uniform loading density in the furnace chamber, attraction of weakly coking coal to the charge, etc.

However, the loading of thermally prepared coal charges is technologically much more complicated than the loading of ordinary wet charges, which is largely due to the physical properties of the charge. Thermally prepared coal charge is explosive, has high fluidity and increased dusting. These properties give rise to a number of problems associated with the prevention of pollution of the atmosphere, the entrainment of the charge with gases through the gas collectors to the chemical compartments of the coke workshop, fire and explosion hazards.

There is a method of smokeless loading of coke ovens thermally prepared coal charge, including charging of the charge through the middle hatch of the furnace, removal of loading gases through the outermost hatches and their subsequent removal from dust, combustion and emission of Cl 3 into the atmosphere.

The disadvantage of this method is that under the influence of loading gases, the telescopic pipe heats up to 700-750 ° C. When the pipe is heated, the ring seals are deformed, as a result of which the tightness of the system is broken and atmospheric air flows into it. The entry of atmospheric air into the system leads to the formation of an explosive gas-air mixture, which, in the presence of an open flame in the gas suction zone, significantly reduces the explosion-proof loading.

In addition, the cleaning of gases from dust is not complete.

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eliminates clogging of pipelines and cleaning systems with entrained charge, and removal of hot gases increases the thermal load of the ventilation-5 of the coal-loading car system. All this reduces the efficiency of the process and safety of work.

The aim of the invention is to increase the explosion safety by reducing 10 air suction.

The goal is achieved by the fact that according to the method of smokeless loading of coke ovens of thermally prepared coal charge, including charging the charge through the middle hatch of the furnace, removal of loading gases through the outer hatches, subsequent cleaning from dust, burning and emission into the atmosphere, loading gases additionally

20 irrigate with water at their exit from the coke oven.

The supply of water to the gas feed stream leads to the formation of a vapor – gas mixture with a certain excessive pressure, which prevents atmospheric air from leaking.

The drawing shows a device for carrying out the proposed method.

30 A device for carrying out the method includes a hopper 1 with telescopic nozzles 2, telescopic pipes 3 and 4, diesel pumps 5 and 6, cyclones 7 and 8, slime collectors 9 and 10, combustion chambers 11 and 12 with ignitors 13. The device is equipped with nozzles 14 - 17 for supplying water, connected to water tank 18, and pumps 19 and 20. The device is mounted. Q is mounted on frame 21 with chassis 22.

Example. The method is carried out under production conditions. Before loading the coke oven, the charge of the coal-loading machine is installed above the coke oven so that the centers of the telescopic pipes 2 and the telescopic pipes 3 and 4 coincide with the centers of the charging doors of the coke oven. Then, the Krshchka (not shown) is removed from the loading hatches and the telescopic pipe 2 is lowered onto the middle hatch, and pipes 3 and 4 are introduced into the outer hatches to discharge loading gases. Moreover, pipes 3 and 4

5 are introduced into the coke oven to such a depth that their lower edges are located below the roof by an amount of 20-30 mm. The ventilation cleaning devices are turned on and the mixture is discharged into the coke oven from the bunker 1. The absorbing coal gases containing the suspended particles in the suspended state are sucked out of the furnace through telescopes 3 and 4 with smoke exhausters 5 and 6. Gas cleaning from dust takes place in cyclones 7 and 8, under which sludge collectors 9 and 10 are installed. Dust-free charging gases at the exhaust of smoke exhausters 5 and 6 enter the combustion chambers 11 and 12, ignite with igniters 13, Burn down and are released into the atmosphere. In the process of cleaning gases from dust, they are irrigated with water through nozzles 14 and 15 placed in gas pipelines in front of cyclones 7 and 8. At the exit of the charging gases from the hatches of a coke oven, they are irrigated with water in the internal cavities of the moving parts of telescopic pipes 3 and 4 with the help of nozzles 16 and 17. At the same time, not only the temperature of the exhaust gases decreases, but also a vapor-gas mixture is formed, which prevents atmospheric air from leaking into the telescopic tubes 3 and 4 and the formation of an explosive mixture. The water supplied for irrigation evaporates under the influence of the high temperature of the exhaust gases: it does not penetrate into the coke oven. The slag that accumulates in the slurry tanks 9 and 10 is removed from them periodically. 1-4 After the charge is completely removed from the hopper, 1 branch pipe 2 and movable parts of the telescopic pipes 3 and 4 are removed from the loading hatches and closed with lids (not shown), then the ventilation-cleaning unit is disconnected. This completes the coke oven loading process. The autonomy of the two air-cleaning units allows for the smoke-free loading of the total charge accumulated in the bunker during the calculated loading cycle. In the event of a failure of one of the installations, the second ensures the removal and purification of loading gases through one of the outermost hatches in a time exceeding the calculated one by 40-50%. When both installations are out of operation, the evacuation of gas from the coke oven can be carried out in the usual way through 23 and 24 using steam injection. Thus, the use in the industry of the proposed method of smokeless loading of coke ovens of thermally prepared coal charge and a machine for its implementation improves safety by evaporative cooling of the charging gases before entering them into the cleaning and burning system and eliminating atmospheric air leaks and increasing reliability and equipment durability by reducing its thermal stress.

Claims (1)

METHOD FOR CLEANLESS LOADING OF COKE FURNACES THERMALLY PREPARED BY COAL FURNACE, including filling the charge through the middle hatch of the furnace, removal of feed gases through the end hatches and their subsequent cleaning from dust, burning and discharge into the atmosphere, which differs in that it reduces the risk of explosion air, the loading gases are additionally irrigated with water at the outlet of the coke oven. • 7 1 1122681