WO2020122634A2 - Coke dry quenching method in cdq equipment - Google Patents

Abstract

A coke dry quenching method in a CDQ equipment is provided. The coke dry quenching method of the present invention burns remaining gas to be generated after charging red-hot coke in a prechamber at the upper part of CDQ equipment, and then blows a cooling gas at the red-hot coke, which has been transferred to a cooling chamber at the lower part thereof, thereby recovering sensible heat and cooling same, and in order to burn the remaining gas to be generated after charging the red-hot coke, high-temperature COG, which leaks from the carbonization chamber of a coke oven, is collected and used as a combustion gas.

Description

Dry digestion of coke at CDQ facilities

The present invention relates to a method for dry fire extinguishing of coke that can improve the efficiency of a CDQ facility, and more specifically, leaking from a coke oven as combustion air that supplies red coke for combustion of residual gas generated after charging the CDQ. By using the high-temperature gas to be removed, it is possible to remove air pollutants generated in the coke oven, as well as to improve the dry combustion method of coke that can improve the CDQ combustion efficiency.

In general, a coke oven equipped with a plurality of carbonization chambers is a facility for producing coke by heating and blocking external air at a temperature of about 1240°C or higher for about 15 to 26 hours after charging coal in the carbonization chamber using a charging vehicle. to be. After the drying operation, the coke is opened from the carbonization chamber door, discharged from the carbonization chamber by an extruder ram, loaded into a fire truck through a coke guide of a transfer car, and then transferred to CDQ for extinguishing. When the discharge of coke from the carbonization chamber is completed, the extruder and the transfer car close the carbonization chamber main door, and reload the coal into the carbonization chamber to repeat the drying operation.

On the other hand, the red coke loaded in the CDQ passes the cooling gas whose main component is nitrogen in the reverse direction, thereby lowering the temperature of the coke and thereby recovering heat by nitrogen. Nitrogen cooling gas is used to produce high-pressure steam in the boiler after the temperature is raised to about 980°C after heat recovery, and the cooled gas having a lower temperature is circulated in CDQ. However, since the red coke loaded in the CDQ is in a high temperature state, it continues to emit combustible gases such as H ₂ , CH ₄ and CO while the temperature falls. Therefore, it is necessary to burn the combustible gas generated in the process of cooling the red coke loaded in the CDQ.

To this end, conventionally, external air having a constant flow rate is forcibly supplied to CDQ to combust combustible gas generated from the red-hot coke, and high-temperature steam is produced and used for power generation by using the generated high-temperature exhaust gas. That is, by using external air at room temperature as a combustion gas necessary for burning the combustible residual gas generated from the red coke loaded in the CDQ, the flue gas temperature generated after combustion is low, and thus the thermal efficiency of the circulating gas for producing high-pressure steam decreases. There was.

In order to overcome this problem, the invention described in Patent Document 1 can be cited as an example of the prior art. In Patent Document 1, an invention is proposed in which a method of sucking air preheated by coke around a coke cutting device is installed by installing a combustion air intake duct near the coke cutting device. However, the patent document 1 does not have the characteristic of removing substances that are harmful to the environment discharged from the coke oven, not merely improving the CDQ efficiency.

[Advanced technical literature]

(Patent Document 1) Korean Patent Registration No. 10-0761733

Therefore, the present invention is proposed to solve the above-mentioned problems, and is discharged from the coke oven by collecting and using high-temperature gas leaking from the coke oven as a combustion gas burning the residual gas generated in the dry extinguishing process in the CDQ facility. It is an object of the present invention to provide a method for dry digestion of coke in a CDQ facility that can not only remove harmful gases but also improve the power generation efficiency of CDQ.

In addition, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly understood by those skilled in the art from the following description. It could be.

The present invention for achieving the above object,

In the coke dry fire extinguishing method in which the residual gas generated after charging the red coke in the prechamber at the top of the CDQ facility is burned, and then the sensible heat is recovered and cooled by blowing the cooling gas into the red coke transferred to the lower cooling chamber. ,

For the combustion of residual gas generated after charging of the red coke, the high temperature COG (COKE OVEN GAS) leaked from the carbonization chamber of the coke oven (COKE OVEN) is collected and used as a combustion gas. It is about the method of dry digestion.

It is preferable that the COG is collected by a collecting device installed at an upper portion of the carbonization chamber of the coke oven.

It is preferable that a shielding film configured to prevent external discharge of the carbonization chamber COG that is collected by falling to the side of the collecting device is provided on the upper portion of the collecting device, if necessary.

The shielding film is preferably made of a bundle of asbestos or metal plates.

It is preferable that the collecting device and the CDQ facility are connected to a collecting gas supply pipe for supplying collecting gas, and a solenoid valve capable of opening and closing the inflow of the captured COG is formed in the collecting gas supply pipe at the top of the collecting device.

It is preferable that the solenoid valve is configured to automatically control opening and closing according to whether or not the carbonization chamber is operated.

It is preferable that the capture gas supply pipe is provided with a combustion gas blowing device capable of controlling the intake amount of the capture gas in conjunction with the H ₂ /CO content ratio in the CDQ facility.

It is preferable that a dust filter for collecting dust among the collected gases is installed in the collected gas supply pipe.

The present invention having the configuration as described above, instead of supplying air at room temperature to burn combustible gas generated after charging the red coke dried in the coke oven to the CDQ, injects hot air generated in the coke oven to convert the CDQ. Energy efficiency can be improved.

In addition, the present invention captures the residual gas and coke dust generated during coke extrusion in a coke oven, COG leaking from the carbonization chamber door after charging bituminous coal, and high temperature air generated by contact with the outside of the high temperature carbonization chamber wall and outside air By using CDQ as a combustion gas, the odor of harmful gas briquette gas caused by a coke oven can be fundamentally eliminated.

FIG. 1 is a schematic diagram showing collecting and supplying the leaking gas in the upper portion of the carbonization chamber of the coke oven as CDQ combustion air and supplying it to the CDQ.

FIG. 2 is a view showing a collecting device for collecting carbonization chamber leakage gas from an upper portion of a coke oven.

3 is a diagram showing flow rate and temperature measurement values when the outside air is injected into the CDQ as combustion air by a conventional method.

4 is a diagram showing the flow rate and temperature of the gas collected from the top of the carbonization chamber of the coke oven.

5 is a graph showing the flow rate and temperature of the gas collected when extruding coke in the carbonization chamber of the coke oven after completion of drying.

6 is a graph showing the CO concentration and temperature contained in the air collected during coke extrusion of FIG. 5.

Hereinafter, the present invention will be described.

In the present invention, the CDQ efficiency is improved and the coke oven is used by collecting the carbonized gas leaking gas whose main component is COG discharged from the coke oven and hot air (containing briquette gas components) in the upper part of the carbonized gas as combustion air of CDQ. It is characterized by removing the odor (briquette gas) that is discharged.

In the coke dry fire extinguishing method in the CDQ of the present invention, the residual gas generated after charging the red coke in the prechamber at the top of the CDQ facility is burned, and then the cooling gas is blown into the red coke transferred to the lower cooling chamber. In the coke dry fire extinguishing method of recovering and cooling the sensible heat, for combustion of residual gas generated after charging of the red coke, high temperature COG leaked from the carbonization chamber of a coke oven (COKE OVEN) is captured and burned. It is used as gas.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing that the leaking gas in the upper part of the carbonization chamber of the coke oven is collected and supplied to CDQ as air for CDQ combustion.

In the present invention, in the method for dry digestion of coke in the CDQ facility (30), COG leaked from the carbonization chamber (13) of the coke orb (10) is collected, and the residual gas generated in the CDQ (30) facility is collected. Used as combustion gas.

Among the CDQ 30 facilities, a pre-not shown prechamber is formed on the upper portion, and a cooling chamber (not shown) is formed on the lower portion, and the red coke loaded in the prechamber is configured to move to the lower cooling chamber.

When the red coke is charged in the prechamber, combustible gases such as H ₂ , CH ₄ and CO are released from the red coke, and high temperature flue gas is generated by burning the combustible gas, which is used for power generation by producing high-pressure steam.

In addition, the sensible heat is recovered and cooled by blowing a cooling gas such as nitrogen into the red coke transferred to the lower cooling chamber, and the present invention can use the general coke dry fire extinguishing process described above without limitation.

That is, the present invention is a method for dry digestion of coke in the above-described CDQ 30 facility, in order to burn residual gas generated after charging of the red coke, leakage in the carbonization chamber 13 of the coke oven 10 It is characterized by collecting the high-temperature COG and using it as a combustion gas.

In the present invention, the COG can be collected by a collecting device 15 such as a hood installed on the carbonization chamber 13 of the coke oven. The COG thus collected may include both fine and residual COG discharged to the outside during coke extrusion, COG leaking from the dry carbonization chamber, and high-temperature air rising upward through the high-temperature carbonization chamber door.

In the present invention, if necessary, the upper portion of the collecting device 15 is preferably provided with a shielding film 17 configured to prevent external discharge of the carbonization chamber COG that is collected by falling to the side of the collecting device. FIG. 2 is a view showing a collecting device for collecting a carbonization chamber leak gas from an upper portion of a coke oven, and a shielding film 17 is formed on an upper portion of the collecting device 15.

In the present invention, the collecting device 15 is provided for each carbonization chamber 13.

When the coke is extruded in the coke oven, the shielding film 17 installed on the collecting device 13 is lifted up to the upper part of the collecting device so as not to interfere with coke extrusion, and the DAMPER (solenoid valve) described later is opened and extruded only by a simple collecting device. Residual gas and coke dust can be collected.

After the extrusion, the shielding film 17 is dropped below the carbonization chamber 13 to collect gas leaking from the carbonization chamber.

In general, the air heated by the outer wall of the carbonization chamber rises from the bottom of the carbonization chamber to the top, and COG leaking from the carbonization chamber flows to the top of the carbonization chamber by an upward airflow and is naturally collected by the collecting device. However, when the wind blows, the COG leak gas moves sideways. Even in this situation, the shielding film 17 was installed for the purpose of collecting COG leak gas and raising the temperature of the air, and the shielding film 17 is configured to interlock its operation in accordance with the weather and coke extrusion time.

In the present invention, the shielding film 17 is preferably made of a bundle of asbestos or metal plates.

In addition, the collecting device 15 and the CDQ facility 30 are connected to a collecting gas supply pipe 20 for supplying collecting gas, and opening and closing of the collected COG is opened and closed in the collecting gas supply pipe 20 above the collecting device. It is preferable that a solenoid valve 21 serving as a damper that can be formed is formed.

And it is preferable that the solenoid valve 21 is configured to automatically control the opening and closing according to the operation of the carbonization chamber.

In addition, it is preferable that the capture gas supply pipe 20 is provided with a combustion gas blowing device 25 capable of controlling the inflow of the capture gas in conjunction with the H ₂ /CO content ratio in the CDQ facility 30.

In addition, the collecting gas supply pipe 20 is preferably provided with a dust filter 23 for collecting dust among the collecting gas between the solenoid valve 21 and the blower (25).

Furthermore, an air inlet 29 for supplying air to the capture gas may be formed in the collection gas supply pipe 20.

The present invention configured as described above collects the leakage gas of the carbonization chamber whose main component is COG discharged from the coke oven and the high temperature air (containing the briquette gas component) at the top of the carbonization chamber and uses it as the combustion air of CDQ. Enhancement and odors from the coke oven (briquette gas) can be effectively removed.

Hereinafter, the present invention will be described in detail through examples.

(Conventional example)

External air was used as a combustion gas for CDQ. When using such a conventional method, the temperature is high during the day, but the temperature is lowered at night, so there is no choice but to change the CDQ efficiency.

3 is a diagram showing flow rate and temperature measurement values when external air is injected into the CDQ as combustion air. As shown in FIG. 3, in particular, CDQ efficiency is inevitably lowered when the temperature drops below zero in winter. In addition, since very low temperature air is introduced, refractory of CDQ may be caused.

(Example 1)

This embodiment is a result of measuring the flow rate and temperature of the CDQ combustion air collected in the collection device installed on the upper part of the carbonization chamber door, as shown in FIG. 4. It can be seen that regardless of the capture air flow rate, the temperature of the CDQ combustion air is 55° C. on average, which is relatively higher than that of the outside air. Therefore, when using the air collected from the upper part of the carbonization chamber rather than using the outside air as the conventional CDQ combustion air, the energy saving is equivalent to about 200 Mcal/hr when the temperature of the collected air is higher than that of the winter season by about 40°C.

(Example 2)

5 shows the result of measuring the temperature of the residual gas discharged to the outside during coke extrusion after completion of drying. The collected residual COG reacts with oxygen, and the temperature of the combustion air rises rapidly to 200~800℃. At this time, the reason for the decrease in the flow rate is that a pressure loss inside the pipe occurs due to a sudden increase in temperature. In addition, as shown in Figure 6, it can be seen that the CO concentration contained in the air collected during coke extrusion may exceed 8000 ppm.

Therefore, if the collected COG is used as a combustion gas in the CDQ facility as described above, CO is extruded during the coke extrusion process to capture the exhaust gas containing a lot of environmentally harmful air pollutants and remove it from the CDQ while simultaneously burning it. It can be seen that the exothermic reaction has an effect of increasing the thermal efficiency of CDQ.

As described above, in the detailed description of the present invention, the preferred embodiments of the present invention have been described, but those skilled in the art to which the present invention pertains have various modifications within the limits that do not depart from the scope of the present invention. Of course this is possible. Therefore, the scope of rights of the present invention should not be limited to the described embodiments, but should be defined by the equivalents as well as the claims described later.

Claims (8)

1. In the coke dry fire extinguishing method in which the residual gas generated after charging the red coke in the prechamber at the top of the CDQ facility is burned, and then the sensible heat is recovered and cooled by blowing the cooling gas into the red coke transferred to the lower cooling chamber. ,

   A method for dry digestion of coke, characterized by collecting high temperature COG leaked from a carbonization chamber of a coke oven (COKE OVEN) and using it as a combustion gas for combustion of residual gas generated after charging of the red coke.
2. [6] The method of claim 1, wherein the COG is collected by a collecting device installed in an upper portion of the carbonization chamber of the coke oven.
3. The method of claim 2, wherein the upper portion of the collecting device is provided with a shielding film configured to prevent external discharge of the carbonization chamber COG that is collected by falling to the side of the collecting device.
4. 4. The method of claim 3, wherein the shielding film is made of a bundle of asbestos or metal plates.
5. According to claim 1, The collecting device and the CDQ facility is connected to a collecting gas supply pipe for supplying collecting gas, and a solenoid valve capable of opening and closing the collected COG is formed in the collecting gas supply pipe at the top of the collecting device. Coke's dry digestion method characterized by being.
6. The method of claim 5, wherein the solenoid valve is provided so that the opening and closing is automatically controlled according to the operation of the carbonization chamber.
7. The method according to claim 5, wherein the collection gas supply pipe is equipped with a combustion gas blower capable of controlling the inflow of the capture gas in connection with the H ₂ /CO content ratio in the CDQ facility.
8. The method of claim 5, wherein the collecting gas supply pipe is provided with a dust filter for collecting dust among the collecting gas.

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