JPH07188668A - Dust collection in charging coke oven with coal - Google Patents

Abstract

PURPOSE:To cool inexpensively collected dust gas to prevent its explosion by spraying water to the coal dust gas from a plurality of nozzles when the temperature of the coal dust gas is above a specified upper limit and stopping the spraying when the temperature is below a specified lower limit. CONSTITUTION:When a coal dust gas generated during charging of a coke oven with coal is to be collected, a collection duct 1 mounted on a charging car is connected with a fixed duct 4, dust collection hoods 6 connected with the top ends of branched ducts 5 are set on the respective coal charge inlets 7, and the dust is collected with a dust collector connected with the fixed duct 4. When the temperature of the collected dust gas measured with a thermometer 2 is above a specified upper limit, a water supply pump 8 is started by the command from the thermometer 2 to supply cooling water from a water supply tank 9 into water spray nozzles 3 from which the supplied water is sprayed in the form of mist over the collected dust gas. When this temperature is below a specified lower limit, the pump 8 is stopped. According to this method, the gas explosion in dust collection can be prevented by using the smallest possible amount of water and no waste water disposal equipment is necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects coal dust gas generated when coal is charged into a coke oven to a fixed dust collection duct provided on the ground of a dust collection duct with a hood mounted on a coal car. And a method of collecting dust with a dust collector.

[0002]

2. Description of the Related Art When coal is charged into a coke oven, a gas containing coal dust blown out from a coal charging hole is connected to a fixed dust collecting duct installed on the ground of a hooded dust collecting duct mounted on a coal car. Then, as a conventional method of collecting dust with a dust collector,
There is a technique disclosed in Japanese Examined Patent Publication No. 60-6388.
The dust collecting method based on this technique is as follows.

That is, as shown in FIG. 2, a dust collecting member 26 is provided at a front stage and an eliminator (eliminator) 27 is provided at a rear stage in the dust collecting cooler 21 with respect to an inflow direction of dust gas.
Further, a sprinkler 2 is provided in front of each of these members 26 and 27.
8 and 29 are provided. Then, the dust gas collected by the hood 23 at each charging port 25 is introduced into the dust collector 21 via the collecting duct 22. The gas that burns at this time is cooled by the front water sprinkler 28, and water is attached to the powdery fluid to form a mist state, and the large diameter mist is collected by the dust collecting member 26. Subsequently, it is further cooled by the latter-stage water sprinkler 29, most of the mist is collected by the eliminator 27, and then sent to a ground dust collector or the like. The collected water is collected in the drainage tank 34.

[0004]

However, the technique disclosed in Japanese Patent Publication No. 60-6388 mentioned above has the following problems.
There were the following problems. That is, since the purpose is not only to cool the gas but also to collect the carbon dust in the gas, there is a problem that a new facility for treating the waste water is required.

Further, since a large amount of air leaks from the portion of the lid (there are plural corresponding to a plurality of kilns) provided in the portion connected to the hood-equipped dust collecting duct mounted on the coal-fired car of the fixed duct, the coal-fired car is originally large. Providing a large pressure loss portion in the dust collection duct of 1 also causes a problem that suction efficiency is reduced.

The present invention has been made in order to solve the above-mentioned problems of the prior art, does not require wastewater treatment, does not lower suction efficiency, and explodes the temperature of the collected gas. It is an object of the present invention to provide a dust collection method when charging a coke oven coal that can be kept to the limit.

[0007]

A method for collecting dust at the time of charging a coal in a coke oven according to the present invention is to connect a dust collecting duct with a hood mounted on a coal truck to a fixed dust collecting duct so that the coke oven is charged with coal. In the method of collecting the coal dust gas generated at the time of charging with a dust collector, a thermometer is installed in the dust collection duct mounted on the coal car and the temperature of the coal dust gas in the dust collection duct measured by the thermometer is When the specified upper limit is exceeded, water is sprayed into the coal dust gas from a plurality of water spray nozzles provided along the circumferential direction on the outer peripheral surface of the dust collection duct, and the coal dust gas in the dust collection duct measured by a thermometer is discharged. When the temperature is below the specified lower limit,
This is to stop watering from a plurality of watering nozzles.

[0008]

It is necessary to prevent the explosion of the dust collecting gas during the coal charging process at the time of leveling after the coal charging into the carbonization chamber is completed. This is because air is sucked into the furnace by opening the small lid, the required suction gas amount increases, and the gas burns.

Therefore, if the gas temperature in the dust collection duct of the coal car is constantly measured, the possibility of dust collection gas explosion can be predicted. Then, when the measured temperature reaches the preset allowable upper limit temperature of the dust collecting gas, water is sprayed (mist spray) from the water spray nozzle to the dust collecting gas in the duct, and water is sprayed when the measured temperature reaches the preset lower limit temperature. By the method of stopping, the explosion of dust collecting gas can be prevented with a minimum amount of water. In addition, since the sprinkled water evaporates and vaporizes, it is discharged together with the dust collecting gas,
No large pressure loss occurs and no wastewater treatment facility is required.

[0010]

EXAMPLE A dust collecting method for charging a coke oven coal according to an example of the present invention will be described with reference to FIG. In this dust collecting method, the temperature of the dust collecting gas in the collecting duct 1 can be measured by installing the thermometer 2 in the collecting duct 1 mounted on the coal charging vehicle, and at the same time, on the outer peripheral surface of the collecting duct 1. A plurality of water spray nozzles 3 are provided along the circumferential direction so that mist spray can be performed toward the dust collecting gas in the collecting duct 1.

When collecting coal dust gas generated when coal is charged into the coke oven, the collecting duct 1 mounted on the coal car is connected to the fixed duct 4 and branched from the collecting duct 1. The dust collecting hood 6 connected to the tip of the branch duct 5 is set at each coal charging port 7. Then, dust is collected by a dust collector (not shown) connected to the fixed duct 4.

When the temperature of the dust collecting gas measured by the thermometer 2 exceeds a predetermined upper limit temperature, the water supply pump 8 starts operating based on a command from the thermometer 2 and the cooling water is supplied from the water supply tank 9. Is supplied to the watering nozzle 3. Then, the cooling water is sprayed in the form of mist from the water spray nozzle 3 toward the dust collecting gas.

In this way, the dust collecting gas is cooled,
When the temperature of the dust collecting gas measured by the thermometer 2 falls below a predetermined lower limit temperature, the water feed pump 8 is stopped based on the instruction from the thermometer 2.

In the dust collecting method for charging the coal in the coke oven according to the embodiment of the present invention, since the dust is collected as described above, the explosion of the coal dust gas at the time of collecting dust is cooled to the minimum necessary amount. It can be prevented with water, and no wastewater treatment facility is required.

[0015]

EFFECTS OF THE INVENTION Explosion of dust collecting gas at the time of charging a coke oven coal can be prevented without enormous equipment cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a dust collection method when charging a coke oven coal according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a dust collection method when charging a conventional coke oven coal.

[Explanation of symbols]

 1 Collecting Duct 2 Thermometer 3 Sprinkling Nozzle 4 Fixed Duct 5 Branch Duct 6 Dust Collection Hood 7 Coal Inlet 8 Water Supply Pump 9 Water Tank

Claims (1)

[Claims] 1. A method for collecting coal dust gas generated when a coal is charged into a coke oven by a dust collector by connecting a dust collecting duct with a hood mounted on a coal charging vehicle to a fixed dust collecting duct. A thermometer is installed in the dust collection duct installed in the coal car, and when the temperature of the coal dust gas in the dust collection duct measured by the thermometer exceeds the specified upper limit, the outer circumference of the dust collection duct runs along the circumferential direction. If the temperature of the coal dust gas in the dust collection duct measured by the thermometer falls below the specified lower limit value, the water spray from the multiple spray nozzles is stopped. A method for collecting dust when charging a coke oven with coal.