KR100625050B1 - Apparatus and method for cooling coke oven gas - Google Patents

Abstract

The present invention provides a circulating eye feeder for supplying circulating eye to the coke oven gas discharged from the coke oven, so as to maintain a constant temperature of the coolant flowing into the cooling tower, and exchanges heat between the circulating eye and the cooling water introduced from the outside. It provides a coke oven gas cooling device including a heat exchanger to be supplied, and the coke oven gas is introduced from the coke oven, the cooling tower for cooling the coke oven gas by using the cooling water discharged from the heat exchanger.

Coke oven gas, coke oven gas chiller, heat exchanger, coolant

Description

Coke oven gas cooling device and cooling method of coke oven gas {APPARATUS AND METHOD FOR COOLING COKE OVEN GAS}

1 is a schematic configuration diagram showing a coke purification apparatus according to the prior art.

Figure 2 is a schematic diagram showing a coke purification apparatus according to an embodiment of the present invention.

The present invention relates to a cooling device for coke oven gas, and more particularly, to a cooling device for coke oven gas including a heat exchanger for inducing heat exchange between circulating water and cooling water.

Coke oven gas (COG) is produced by the volatile matter of coal when coke is prepared by charging coal in a hot coke oven, and in general, coke oven gas is about 800 ° C to 900 It is discharged at a temperature of about ℃.

The coke oven gas contains various chemical substances, which include not only valuable substances that are the raw materials of coal chemistry such as benzene, toluene and naphthalene, but also air pollution such as ammonia, hydrogen sulfide and hydrogen cyanide. It contains a large amount of substances causing a coke oven gas purification apparatus is installed to recover these harmful and valuable substances.

1 is a schematic configuration diagram illustrating a coke oven gas purification device according to the prior art, and a coke oven gas purification device according to the prior art will be described with reference to the drawings.

The coke oven gas purification device is a cooling device 120, hydrogen hydrogen absorption tower 130, ammonia absorption tower 140, BTX absorption tower 150 to recover various harmful and valuable substances contained in the coke oven gas It includes. Coke oven gas is passed through these devices to remove hydrogen sulfide, ammonia and BTX, leaving only the useful components, which are finally reused as high calorific combustion gases in steel mills.

In order to proceed with the absorption process, the temperature of the coke oven gas discharged to a high temperature should be lowered to room temperature. For this purpose, the coke oven gas cooling device 120 is installed.

 The coke oven gas cooling device 120 includes a circulating eye feeder 121 and a cooling tower 123, the circulating eye feeder 121 is circulated to the outlet side pipe (GCM: Gas Collecting Main) (GCM) of the coke oven 110 Spraying the ordination serves to reduce the temperature of the coke oven gas of 800 ℃ or more to about 80 ℃.

And the coke oven gas lowered to 80 ℃ is sent to the cooling tower (PGC: Primary Gas Cooler) (123) in the chemical conversion process is heat-exchanged with 30 ℃ cooling water and countercurrent to cool to about 30 ℃ to 35 ℃, this temperature is seasonal In the above temperature range. After that, the coke oven gas that has been changed to room temperature is recycled through a purification process.

In the cooling tower 123 used to cool the coke oven gas, a considerable amount of external water for cooling, such as seawater and fresh water, is used. Such external water is not circulated, and the external water used once is discharged to the outside.

However, the temperature of the external water is a seasonal variation is a problem that can not control the coke oven gas to the appropriate temperature. In particular, since the temperature of the external water is very low in winter, when a predetermined amount of external water flows into the cooling tower 123, the coke oven gas is cooled more than the set temperature to precipitate naphthalene inside the cooling tower 123 to cool it. The problem of lowering efficiency arises.

Accordingly, in the related art, an attempt was made to maintain a constant temperature of the coke oven gas by adjusting the amount of cooling water supplied to the cooling tower 123, but if the supply amount of the cooling water is not constant, the temperature deviation of the coke oven gas discharged from the cooling tower 123 is Is very severe and there is a problem of lowering the efficiency of the coke oven gas purification process.

In addition, if the amount of cooling water supplied to the cooling tower 123 is reduced, there is a problem that damage to the cooling tower equipment, the cooling efficiency of the cooling tower 123 is lowered.

Therefore, the present invention has been made to solve the problems described above, the object of the present invention is to use the circulating water used for the cooling of the coke oven gas to maintain the temperature of the cooling water flowing into the cooling tower at an appropriate level. The present invention provides a coke oven gas cooling apparatus including a coke oven gas cooler including a heat exchanger for heating cooling water, and a process of exchanging heat between the circulating water and the cooling water.

In order to achieve the above object, the coke oven gas cooling apparatus according to the present invention may include a heat exchanger capable of heating the cooling water introduced from the outside by using the circulation eye.

And the cooling device is a circulating eye supply for supplying circulating eye to the coke oven gas discharged from the coke oven, a heat exchanger for exchanging heat between the circulation eye and the cooling water flowing from the outside, and the coke oven in the coke oven Gas may be introduced, and may include a cooling tower for cooling the coke oven gas by using the cooling water discharged from the heat exchanger.

Coke oven gas is a gas produced by distilling coal to make coke, and as a by-product when refining it, various useful chemicals can be obtained and the purified gas can be used as fuel gas.

In order to purify the coke oven gas, the temperature of the coke oven gas must be reduced to a certain level, so that a coke oven is provided with a cooling device for cooling the coke oven gas.

Such a cooling device is provided with a circulating eye feeder and a cooling tower to cool the coke oven gas to a desired temperature, and the circulating eye feeder primarily cools the coke oven gas discharged to the outlet pipe of the coke oven, and the cooling tower is circulated. The coke oven gas cooled by ordination is cooled to an appropriate temperature using cooling water.

Here, the cooling water used in the cooling tower is not circulated, and the cooling water used once is discharged to the outside, and external water such as fresh water or sea water may be introduced again from the outside in order to use the cooling water as the cooling water in the cooling tower.

In addition, the heat exchanger may heat the cooling water to a constant temperature by using the heated circulating eye in the process of cooling the coke oven gas.

In addition, the cooling device may further include a flow controller for adjusting the amount of circulating water flowing into the heat exchanger. Such a flow regulator serves to adjust an appropriate amount of circulating water to be introduced into the heat exchanger according to the temperature of the coolant flowing into the heat exchanger.

The coke oven gas according to the present invention by such devices is a step of spraying the circulating eye at the outlet of the coke oven, the process of exchanging heat between the used circulation eye and the cooling water flowing into the cooling tower, and the coke oven gas cooling tower It can be cooled to an appropriate temperature through the process of cooling to coolant by flowing in.

In addition, the coke oven gas is a process of cooling the coke oven gas discharged from the coke oven using the circulation eye, the process of adjusting the flow rate of the circulating eye flow into the heat exchanger, between the used circulating eye and the cooling water introduced from the outside Through the process of exchanging heat and the process of introducing the coke oven gas into the cooling tower and cooling it with cooling water, it may be cooled to an appropriate temperature.

Hereinafter, with reference to the accompanying drawings will be described in detail. 2 is a schematic diagram illustrating a coke oven gas purification device according to an embodiment of the present invention.

Referring to the drawings described above, the coke oven gas purification device is a cooling device 20 for cooling the coke oven gas discharged from the coke oven 10, in the coke oven gas cooled to room temperature in the cooling device 20 Hydrogen emulsion absorption tower 30 for extracting hydrogen sulfide, ammonia absorption tower 40 for extracting ammonia from the coke oven gas, and BTX absorption tower 50 for extracting BTX from the coke oven gas.

The coke oven gas can be refined during such a device and reused as a high calorific combustion gas.

In addition, the cooling device 20 is a cooling tower for cooling the coke oven gas cooled by the circulating eye supplier 21 and the coke oven gas cooled by the circulating eye to supply circulating eye sprayed to the outlet side of the coke oven 10 ( 23, and a heat exchanger 25 for inducing heat exchange between the circulating water used to cool the coke Auborn gas and the cooling water flowing into the cooling tower 23.

Generally, the coke oven gas discharged from the coke oven 10 is about 800 ° C. to 900 ° C., and in order to cool the coke oven gas, circulating water is primarily supplied to the outlet side pipe (Gas Collecting Main) of the coke oven 10. Sprayed. Since the circulating ordination is circulated by the pump and injected into the outlet pipe of the coke oven 110, the temperature of the circulating ordination is considerably high, about 80 ° C.

On the other hand, the cooling water used in the cooling tower is not circulated and once used, the cooling water is discharged to the outside, and in order to use the cooling water as cooling water in the cooling tower, external water such as fresh water or sea water is drawn again. The temperature of the incoming coolant is quite low.

Therefore, the heat exchanger 25 according to the present embodiment introduces circulating water used to cool the coke oven gas and cooling water introduced into the cooling tower 23 to cause mutual heat exchange. Therefore, the cooling water enters the cooling tower 23 through the heat exchanger 25.

As the heat exchange occurs between the cooling water and the circulation eye while passing through the heat exchanger 25, the cooling water is heated to an appropriate temperature, and the circulation eye is relatively cooled to a constant level.

Here, the degree to which the coolant is heated may be variously set according to the structure of the heat exchanger 25. In the winter, the coolant having a low temperature is heated to a predetermined level while passing through the heat exchanger 25, thereby allowing the coolant 23 to be heated. The coke oven gas may be cooled to the desired temperature. And since the cooling water exchanges more heat with the circulating water as the temperature is lower in the heat exchanger 25, the heat exchanger 25 serves to buffer the temperature change of the external water.

And the cooling device 20 may include a flow controller 24 for adjusting the amount of circulating water flowing into the heat exchanger 25, this flow controller 24 is a heat exchanger (25) in accordance with the temperature of the cooling water By controlling the flow rate of the circulating water flowing into the) to maintain the temperature of the cooling water discharged from the heat exchanger (25) at a constant level.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

The following Examples and Comparative Examples are the coke oven gas discharged from the coke oven 10 has a flow rate of 30000 Nm ³ / hr, temperature is 900 ℃, the circulating water sprayed to the coke oven gas flow rate is 460 Nm ³ / hr, the temperature is It is the result of experiment on condition of 80 degreeC.

<Example 1>

When 460 Nm ³ / hr, which is 100% of the circulating water, was heat-exchanged with 210 Nm ³ / hr of seawater cooling water at 4 ° C, the temperature of the cooling water rose to 20 ° C at the outlet of the heat exchanger 25, and the cooling water at 20 ° C was cooled in a cooling tower ( 23 to cool the coke oven gas, the coke oven gas was cooled to 31 ℃.

<Example 2>

When 414 Nm ³ / hr, which is 90% of the circulating water, was heat-exchanged with 210 Nm ³ / hr of seawater cooling water at 7 ° C, the temperature of the cooling water rose to 20 ° C at the outlet of the heat exchanger 25, and the cooling water at 20 ° C was cooled in a cooling tower ( 23 to cool the coke oven gas, the coke oven gas was cooled to 31 ℃.

<Example 3>

When 368 Nm ³ / hr, which is 80% of the circulating water, was heat-exchanged with 210 Nm ³ / hr of seawater cooling water at 10 ° C., the temperature of the cooling water rose to 20 ° C. at the outlet of the heat exchanger 25, and the cooling water at 20 ° C. was cooled in a cooling tower ( 23 to cool the coke oven gas, the coke oven gas was cooled to 31 ℃.

<Example 4>

When 322 Nm ³ / hr, which is 70% of the circulating water, was heat-exchanged with 210 Nm ³ / hr of seawater coolant at 12 ° C, the temperature of the coolant rose to 20 ° C at the outlet of the heat exchanger 25, and the cooling water at 20 ° C was cooled in a cooling tower ( 23 to cool the coke oven gas, the coke oven gas was cooled to 31 ℃.

Comparative Example 1

The seawater cooling water at 10 ° C. was supplied to the cooling tower 23 without heat exchange. In order to maintain the temperature of the coke oven gas discharged from the cooling tower 23 at 31 ° C, the flow rate of the seawater cooling water was reduced from 210 Nm ³ / hr to 100 Nm ³ / hr and supplied to the cooling tower 23. Supplying water causes damage to the equipment, and after a certain time, 210 Nm ³ / hr of seawater cooling water was introduced again. However, in this case, even though a small amount of cooling water is supplied to the cooling tower 23, the cooling tower 23 is damaged while a small amount of cooling water is supplied, and the temperature of the coke oven gas discharged from the cooling tower rises to 76 ° C.

Comparative Example 2

The temperature of the coke oven gas discharged from the cooling tower 23 is maintained at 11 ° C. as a result of introducing 210 Nm ³ / hr of seawater cooling water at 4 ° C. into the cooling tower 23 without passing through the heat exchanger 25. There was a problem that precipitated chemicals such as naphthalene.

As described in the above embodiments, when the cooling water is heated through the heat exchanger 25, the cooling water may be heated to an appropriate temperature by adjusting the flow rate of the circulating water, and the adjustment of the flow rate may be performed by using the sensor and the flow adjusting means. It can be made in a variety of ways.

Therefore, the cooling water flowing into the cooling tower 23 may be introduced into the cooling tower 23 at a constant temperature in spite of the seasonal temperature change, thereby cooling the coke oven gas to an appropriate temperature in the cooling tower 23. .

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, according to the present invention, the cooling water of an appropriate temperature can be introduced into the cooling tower by heating the cooling water by using the circulating ordination in which the coke oven gas is cooled.

According to the present invention, since a constant amount of cooling water can be supplied to the cooling tower at all times, various problems arising in the method of controlling the temperature of the coke oven gas by reducing the flow rate of the cooling water can be solved.

In addition, a flow controller is provided to control the amount of circulating water flowing into the heat exchanger, so that the temperature of the cooling water flowing into the cooling tower is adjusted appropriately by controlling the amount of circulating water flowing into the heat exchanger according to the temperature change of the cooling water flowing from the outside. I can regulate it.

Claims (7)

A circulating eye feeder for supplying circulating water to the coke oven gas discharged from the coke oven; A heat exchanger for exchanging heat between the circulation eye and the cooling water introduced from the outside; And A cooling tower into which the coke oven gas flows from the coke oven and cools the coke oven gas by using the cooling water discharged from the heat exchanger; Coke oven gas cooling device comprising a. According to claim 1, The circulating ordination flowing into the heat exchanger is a circulating ordination that is recovered after being used for cooling the coke gas. According to claim 1, The cooling water is not circulated and the used cooling water is discharged to the coke oven gas cooling device. According to claim 1, The cooling device further comprises a flow regulator for adjusting the amount of circulating water flowing into the heat exchanger coke oven gas cooling device. In the method for cooling the coke oven gas discharged from the coke oven, Spraying circulating water on the outlet side pipe of the coke oven; Exchanging heat between the cooling water introduced from the outside and the circulation eye used for cooling the coke oven gas; And Introducing the coke oven gas into the cooling tower to cool the cooling water discharged from a heat exchanger; Cooling method of the coke oven gas comprising a. The method of claim 5, The cooling water is not circulated and the used cooling water is discharged to the outside coke oven gas cooling method. The method of claim 5, The method of cooling the coke oven gas further comprises the step of adjusting the amount of the circulating water used in the process of exchanging heat, depending on the temperature of the cooling water introduced from the outside.

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