JPS6011073Y2 - Coke dry fire extinguishing equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of coke dry extinguishing equipment that dry-extinguishes red-hot coke extruded from a coke oven using an inert gas or the like and recovers the sensible heat of the gas. be.

Usually, coke dry extinguishing equipment has a single prechamber type as shown in FIG. 1, that is, red hot coke is intermittently charged from the top of the prechamber 2.

The charged red hot coke descends through the prechamber 2, in which there is almost no contact with cold air gas, and enters the coke cooling oven 1 at a nearly constant temperature.

The red-hot coke descending from the coke cooling oven 1 is cooled by contact with cold air gas, passes through a discharge device 7, and is taken out as a cold coke product by a conveyor 8.

On the other hand, the circulating gas is heated in the coke cooling furnace 1 and then passes through the coarse separator 4 and enters the boiler 3.

The boiler 3 uses this high-temperature gas as a heat source to generate high-pressure steam, and the high-temperature gas is cooled and absorbed by a circulation blower 6 via a cyclone 5.

The sucked cold air gas is again supplied to the lower part of the coke cooling furnace and the circulation is repeated.

An exhaust pressure control valve 9 is installed on the discharge side of the circulation blower 6 to maintain the pressure at the top of the prechamber at atmospheric pressure.

The coke powder mixed into the circulation path is collected by a coarse separator 4 and a cyclone 5, and the high temperature coke powder collected by the coarse separator 4 is cooled by a coke powder cooler 10 and then discharged.

The coke breeze collected by the cyclone 5 may be discharged as is, or the bunker type as shown in Fig. 2 may be used, in which red-hot coke is intermittently charged from the top of the coke cooling furnace 1. The cooled coke is cooled by cold air gas as it descends through the coke cooling furnace 1, and is discharged by the discharge device 7.

The discharged cold coke is taken out by a conveyor 8 as a cold coke product.

The circulating gas is heated in the coke cooling furnace, mixed with some cold air gas at the furnace outlet, and enters the boiler 3 via the coarse separator 4.

The circulating gas cooled by heat exchange in the boiler 3 passes through a cyclone 5, is sucked into a circulation blower 6, and is again supplied to the coke cooling furnace.

A gas temperature control valve 9' is installed so that a part of the gas discharged from the circulation blower 6 is mixed with the high temperature gas at the outlet of the coke cooling furnace 1, and the temperature of the boiler artificial gas is controlled to be constant through this mixing.

This control mechanism makes it possible to keep the boiler log gas temperature constant even during intermittent charging of red hot coke and temporary suspension of charging.

However, due to mixing with the cooling circulating gas, the boiler log gas temperature will be slightly lower than that of the pre-chamber single type.

A pressure control valve 9 is provided on the discharge side of the circulating gas blower 6 to maintain the pressure at the top of the coke cooling furnace at atmospheric pressure.

It is known that the coke breeze mixed into the circulating gas is collected by a coarse separator 4 and a cyclone 5, a part of which is cooled by a coke breeze cooler 10, and a part of which is discharged as is. In the pre-chamber one type, there is a pre-chamber 2 which is unnecessary for coke cooling, and since gas is extracted from the coke-filled bed, the concentration of coke breeze in the circulating gas is high, and large coarse particles are required to prevent boiler wear. You need a grain separator.

Furthermore, the brick structure of the furnace is complicated, which is disadvantageous in terms of structural stability, maintainability, and cost.

On the other hand, in the conventional single bunker type, a coke cooling furnace with a very large capacity is required in order to maintain the boiler population temperature at a constant high temperature even when charging of red hot coke is stopped.
In reality, the volume of the coke cooling oven is approximately the same as the prechamber volume of the one-way prechamber type combined with the volume of the coke cooling oven).

Also, the boiler temperature was slightly lower than that of the prechamber type.

The purpose of the present invention is to solve all of the drawbacks of these conventional methods at once, and the details of the present invention will be explained below with reference to the drawings.

FIG. 3 is a flow diagram of the coke dry extinguishing equipment of the present invention.

11 is a coke cooling furnace, 12 is a boiler, 13 is an auxiliary combustion device, 14 is a circulation blower, 15 is a cyclone, 16 is a discharge device, 17 is a conveyor, 18 is a temperature control valve, and 19 is a pressure control valve.

The red-hot coke is intermittently charged from the top of the coke cooling furnace 11, comes into contact with circulating gas as it descends inside the coke cooling furnace 11, is cooled, and is discharged by the discharge device 16.

The discharged cold coke is taken out by a conveyor 17 as product cold coke.

On the other hand, the circulating gas is supplied to the lower part of the coke cooling furnace 11 in a low temperature state, and its temperature is raised by high temperature coke during the rising process, and further mixed with the coke breeze combustion gas during the rising process, and reaches the same temperature as the red hot coke temperature at the top of the cooling furnace 11. and exits the cooling furnace 11.

The high temperature circulating gas leaving the cooling furnace 11 enters the boiler 12,
It is cooled by heat exchange, becomes a low-temperature circulating gas, and is sucked into the circulation blower 14 via the cyclone 15.

The low-temperature circulating gas sucked by the circulating blower 14 is supplied to the cooling furnace 11 again.

As described above, the feature of the present invention is that the temperature of the top of the cooling furnace 11 is maintained at about the same temperature as the red-hot coke temperature by blowing the coke breeze combustion gas into the top of the cooling furnace 11.

This prevents sudden changes in temperature at the top of the furnace when red-hot coke is charged, and facilitates temperature control.

Furthermore, while the charging of red hot coke is stopped, the temperature of the upper gas in the coke cooling furnace 11 gradually decreases, but the furnace top temperature control mechanism by the auxiliary combustion device 13 makes it possible to maintain the furnace top gas temperature constant. .

Therefore, regardless of whether red-hot coke is charged or stopped, boiler 1
It becomes possible to keep the loggas temperature constant for two people.

Note that this example is an example in which coke breeze generated within the equipment itself is used as the fuel for the auxiliary combustion device 13, and the fuel is not particularly limited to coke breeze.

As described above, according to the present invention, the conventional bunker type gas extraction method is improved by extracting the circulating gas from the cooling furnace 11 from the furnace ceiling, and the coke breeze mixed in the circulating gas is removed. In addition to reducing the coke breeze concentration, the gas flow distribution inside the cooling furnace 11 was made uniform.

Therefore, since the concentration of coke breeze in the circulating gas at the outlet of the cooling furnace 11 is small, it is possible to secure the same concentration of coke breeze in front of the boiler as in the conventional pre-chamber one-way system without installing a coarse separator in front of the boiler 12. It is possible.

A part of the coke breeze collected by the cyclone 15 is used as fuel for the auxiliary combustion device 13, and the surplus is discharged outside the system.

The ash of the coke breeze burned in the auxiliary combustion device 13 is collected in the coke packed bed of the cooling furnace 11 and discharged to the outside of the system together with the cold coke.

Therefore, in addition to being able to prevent the efficiency of the boiler 12 from decreasing due to ash, the auxiliary combustion device 13 is provided.
And this combustion gas is passed through the combustion gas conduit 20 and the combustion nozzle 2.
By blowing into the upper part of the cooling furnace 11 through 1 and controlling the temperature at the top of the cooling furnace 11 to the same level as the red-hot coke temperature, the boiler 1 is maintained even during intermittent charging of red-hot coke and temporary charging stoppage.
2. This enabled constant load operation.

Therefore, it has functions equivalent to or better than the conventional method, making it possible to significantly reduce equipment costs and increase the heat recovery rate. Comparison (1) The present invention does not require the pre-chamber 2 installed for the purpose of constant load operation of the boiler, resulting in a significant reduction in equipment costs.

(2) In the case of a single pre-chamber type, since the gas is extracted from the coke packed bed, there is a lot of dust scattered into the gas, and for this reason a coarse particle separator 4 is required before the boiler. According to this method, by adjusting the gas flow rate at the top of the furnace and in the boiler 12, a coarse separator is not required.

Therefore, equipment costs can be significantly reduced.

(3) The heat recovery rate is improved by using the coke breeze generated in this equipment as fuel in the auxiliary combustion device 13.

(4) The structure of the coke cooling furnace 11 is simple, which is advantageous in terms of stability, maintainability, and cost of the brick structure.

(5) Since the structure of the coke cooling furnace 11 is simple, it is easy to obtain a uniform fall of coke, and therefore the cooling efficiency can be improved.

(6) Since the input gas temperature of the boiler 12 is high, steam at a higher temperature and pressure can be recovered in the boiler 12.

(7) Since there is no coarse grain separator, coarse grain separation tasto cooler 10
is not necessary.

In addition, compared to the conventional one-side bunker type, (1) the conventional system has two boilers and one coke cooling furnace to prevent a drop in gas temperature when charging of red-hot coke is temporarily stopped.
must also function as a heat storage device.

Therefore, it requires a much larger volume than a typical coke cooling furnace.

In the case of the present invention, by having the auxiliary combustion device 13, the function as a heat storage device is unnecessary, and therefore, the volume of the coke cooling furnace 11 can be significantly reduced compared to the conventional method.

(2) Since the boiler 12 log gas temperature is significantly higher than that of the conventional method, it can be applied to high-temperature, high-pressure boilers, or the boiler 12 can be made more compact.

(3) The heat recovery rate is improved by using the coke breeze generated in this equipment as fuel in the auxiliary combustion device 13.

Compared to conventional methods, this method contributes to reduced equipment costs and energy saving measures, and has extremely excellent effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the flow of a conventional coke dry extinguishing system with one prechamber type. FIG. 2 is an explanatory diagram showing the flow of one bunker type of conventional coke dry extinguishing equipment. FIG. 3 is a flow diagram showing an embodiment of the coke dry extinguishing equipment of the present invention. 11... Coke cooling furnace, 12... Boiler, 13... Assist combustion device, 14...
Circulation blower 15...Cyclone, 16...
...Discharge device, 17... Conveyor, 18...
...Temperature control valve, 19...Pressure control valve, 2
0... Combustion gas conduit, 21... Combustion nozzle

Claims (1)

[Claim for Utility Model Registration] In equipment that dry-extinguishes red-hot coke extruded from a coke oven and recovers its heat, a device that is sent from the cooling body together with cooling gas to the vicinity of the cooling furnace body. It is characterized by providing an auxiliary combustion device for burning powdered coke, and communicating the combustion gas pipe of the auxiliary combustion device with the upper part of the cooling furnace, so that the temperature at the top of the cooling furnace is controlled to the same level as the red-hot coke temperature. Coke dry extinguishing equipment.