JPS5844715B2 - Red-hot coke dry extinguishing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a dry extinguishing system for red-hot coke.

In a red-hot coke dry extinguishing system, the coke to be cooled is intermittently fed into a hopper usually located at the top.
Coke is temporarily stocked inside the hopper, and the coke is continuously or intermittently supplied onto the grate in the cooling chamber at the bottom of the hopper, and after being cooled by exchanging heat with the cooling gas in the cooling chamber, This is to be discharged outside the cooling device.

The cooling gas is heated by heat exchange with red-hot coke, cooled by a waste heat boiler, etc., and then blown into the cooling chamber again to repeat the same circulation.

In conventional equipment, after red-hot coke is charged into a hopper, the coke inlet at the top of the hopper is covered to maintain the internal pressure of the cooling device, and nitrogen gas is then blown into the hopper.

Conventionally, red-hot coke cannot be completely carbonized in a coke oven, so volatile matter is generated from the coke during cooling, and flammable gases such as hydrogen remain in the hopper or cooling chamber.

Further, when the red hot coke comes into contact with water vapor, a water gas reaction occurs and a large amount of hydrogen gas and carbon oxide gas are generated.

In this equipment, especially in the hopper where red-hot coke is charged, gases such as hydrogen and carbon oxide are generated significantly due to the high temperature of the coke contained therein.If the concentration of these gases is high, when the coke is charged, Opening the lid will allow air to enter the hopper, increasing the possibility of an explosion inside the hopper.

Therefore, in order to charge coke, it is necessary to wait until the concentration of flammable gas in the hopper falls below the explosion range.

As a result, the throughput of the cooling system decreases, the amount of heat recovered decreases,
Problems such as the risk of explosion and the increased running cost of nitrogen gas used to maintain internal pressure have arisen.

The purpose of the present invention is to eliminate the drawbacks of the conventional method of taking up the coke.The purpose of the present invention is to extract the internal gas from a part of the hopper into which red-hot coke is charged, mix it with air, and then use a special combustion device such as a catalyst. through the gas, reducing the concentration of combustible components in the gas,
Most of the combustion gas is returned to the hopper, and a portion is used to maintain the internal pressure of the cooling device.

The details of the present invention will be explained below with reference to the drawings showing one embodiment thereof.

FIG. 1 shows the structure of a coke charging hopper and a waste heat boiler of a red-hot coke dry cooling system.

In Fig. 1, red hot coke ■ taken out from a coke oven (not shown) is placed in coke buckets 1 to 1 (not shown).
etc., to the upper part of the hopper ■.

The lid on the top of the hopper ■ is opened, and the red-hot coke ■ is thrown into the hopper ■.

The lid ■ closes quickly.

The red-hot coke ■ put into the hopper ■ generates flammable gas while being supplied in a layer on the grate 0 moving in the cooling chamber ■, and through heat exchange with the cooling gas ■ passing across the layer. It is cooled and discharged to the outside of the cooling device from an ore discharge section (not shown).

Cooling gas heated by heat exchange with red-hot coke■
is supplied to the waste heat boiler (■) through the duct (■), and after being cooled, it is blown into the cooling chamber (■) again by the cooling gas fan (■).

In the hopper (2), when the oxygen in the rush air mixed in when the red hot coke is charged is consumed by the flammable gas generated by the red hot coke or by the combustion of the red hot coke (2), the concentration of the flammable gas increases.

Therefore, before the flammable gas concentration rises, start the flammable gas fan ■, open the hopper outlet valve [phase] that takes out the gas in the hopper ■, and the hopper blow valve 0 that blows the combustion gas into the hopper. Gas is circulated in the order of pipe systems a, b, and c.

If the flammable gas concentration in the pipe system increases, the air intake valve 0 and the pipe 0 leading to the cooling gas duct 0
The in-system blow valve [phase] is opened, and the combustible components in the gas are combusted by the combustion device [phase].

As explained above, the combustible components of the gas in the hopper can be reduced at any time, and by using air for combustion, the amount of combustion gas increases, and the increased amount is transferred into the cooling device. By blowing, the internal pressure can be maintained, so the throughput of the cooling device and the amount of heat recovery can be secured, and running costs can be reduced.

Although the apparatus of this embodiment has been described as a moving grate type cooling apparatus that continuously cools red-hot coke, the apparatus of the present invention can also be applied to a shut type cooling apparatus.

Furthermore, as is clear from FIG. 2 showing the change in gas concentration in the conventional hopper over time and FIG. 3 showing the change over time in the gas concentration in the hopper of the present invention, in the apparatus of the present invention, The concentration of combustible gas in the hopper is sufficiently reduced, making it possible to avoid the risk of explosion, and since there is no need to blow nitrogen gas into the hopper, running costs are lower than with conventional equipment of this type. There are advantages such as reduction in

[Brief explanation of drawings]

FIG. 1 shows an implementation structure of the red-hot coke dry extinguishing apparatus of the present invention. In addition, Fig. 2 shows the change in gas concentration in the conventional hopper over time;
FIG. 3 shows an example of a change in gas concentration within the hopper over time in the present invention. ■・・・Red hot coke, ■・・・Hopper,
■・・・Flammable gas fan, [phase]・・・・・・
Hopper outlet valve, ■・・・Hopper blow valve,
■・・・Air intake valve, [Phase]・・・Intrasystem blow valve, [Phase]・・・Combustion device.

Claims (1)

[Claims] 1. Red-hot coke supplied from a hopper with a lid onto a grate in a cooling chamber shut off from the atmosphere is cooled by cooling gas passing across the grate and into the cooling chamber, and on the other hand, by heat exchange with the red-hot coke. In the red-hot coke dry extinguishing system, the heated cooling gas is cooled by a waste heat boiler and recirculated to cool the red-hot coke, and the flammable gas in the hopper is combusted by introducing outside air. A red-hot combustion device characterized in that it has a combustion device that causes a nuclear combustion device to recirculate the exhaust gas discharged from the nuclear combustion device into the hopper, and a pipe system that can mix a portion of the exhaust gas into the cooling gas. Coke dry fire extinguishing system.