KR20130059024A - Method for removing mixture of tar and volatile organic compounds and apparatus for removing the same - Google Patents

Abstract

PURPOSE: A method and an apparatus for removing coke byproducts are provided to remove vapor-phase mixture in which VOCs(Volatile Organic Compounds) and tar generated from a tar mixer are mixed by pyrolyzing the mixture in a CDQ(Coke Dry Quencher) at a high temperature. CONSTITUTION: A method for removing coke byproducts is as follows: a step of extracting vapor-phase mixture in which VOCs and tar generated from a tar mixer are mixed; and a step of pyrolyzing the extracted mixture at a high temperature to remove the mixture. [Reference numerals] (AA) Tar VOCs mixture generated in a tar mixer; (BB) Extraction step; (CC) Suck the generated mixture into a transfer duct(Suction process); (DD) Transfer the sucked mixture through the transfer duct to a dry quenching system(Transfer process); (EE) Control the suction and transfer with an opening and closing valve installed in the transfer duct(Control process); (FF) Removal step; (GG) Combust the transferred mixture in the dry quenching system(Combustion process); (HH) Tar VOCs mixture removed

Description

Method for removing mixture of tar and volatile organic compounds and Apparatus for removing the same}

The present invention relates to a coke by-product removal method and removal device, and to a coke by-product removal method and removal device for removing a mixture of tar and volatile organic compounds generated from the tar mixer.

The coke process is a process of producing coke by high-temperature dry distillation of coal (coal), wherein the coke is a mass of a predetermined size mainly composed of carbon from which volatile matter is removed by high-temperature drying of the raw coal.

At this time, a tar-type mixture of tar and volatile organic compounds (VOCs) is generated from a tar mixer that mixes tar with charged raw coal to reinforce fluidity.

Owing to the use of tar, a lot of odors are generated. If it is not collected and treated, the mixture (Tar VOCs) is leaked, and environmental pollution occurs around the facility. In order to improve this, the mixture is collected separately and removed by low temperature combustion decomposition in a catalytic oxidation furnace.

1 is a view showing a coke by-product removal method according to the prior art.

Referring to the drawings, the existing catalytic oxidation furnace (2) is subjected to low temperature combustion decomposition of the mixture transferred from the tar mixer (1) using a catalyst.

When processed by direct combustion method, the reaction temperature is 700 ℃ ~ 900 ℃ and high temperature is required, but catalytic combustion can be decomposed with less energy (200 ℃ ~ 400 ℃) than the activation energy required to decompose general volatile organic compounds. Therefore, there is an advantage of not only saving fuel, but also improving durability of the equipment due to the low operating temperature.

However, in the present catalytic oxidation furnace 2, there is a problem in that the concentration of the volatile organic compounds introduced is high, and the processing efficiency thereof is lowered to exceed the environmental regulation value.

That is, although the concentration of volatile organic compounds introduced into the catalytic oxidation furnace (2) is lower than the capacity regulation at the time of designing the catalytic oxidation furnace, a mixture composed of Benzene, Toluene, and Xylene components (Benzene) + Toluene + Xylene, BTX) removal efficiency is low, emissions exceed environmental legislation.

In addition, it is difficult to manage the facility according to the flow rate and concentration change, and since the catalyst needs to be replaced or regenerated after use, there is a high post-management cost limit.

The present invention has been made to solve the above problems, an object of the present invention is to provide a coke by-products removal method and removal apparatus for burning off a mixture of tar and volatile organic compounds generated from a tar mixer at a high temperature.

In order to achieve the above object, the coke by-product removal method according to a preferred embodiment of the present invention, tar and volatile organic compounds (Vartile Organic Compounds) generated from a tar mixer to increase the flow rate by mixing the tar with the raw coal An extraction step of extracting a water vapor form mixture of VOCs); And a removing step of decomposing and removing the extracted mixture at high temperature.

In this case, the removing step, it is preferable to include a combustion process for burning in a dry fire extinguishing (Coke Dry Quencher, CDQ) in operation to decompose the extracted mixture.

On the other hand, the extraction step, the suction step of sucking the generated mixture into the transfer duct having a transfer fan while being connected from the tar mixer to the dry fire extinguishing facility; And a transfer step of transferring the sucked mixture to the dry fire extinguishing facility through the transfer duct.

The extracting step may further include a control process of controlling suction and transfer of the mixture by an opening / closing valve installed in the transfer duct so as to open and close the flow path in the transfer duct.

According to another aspect of the invention, the transfer duct is configured to communicate from the tar mixer to the dry fire extinguishing facility; A conveying fan mounted to said conveying duct so as to suck a vapor mixture of tar and volatile organic compounds generated from said tar mixer into said conveying duct and convey it to said dry fire extinguishing facility; And a shut-off valve installed to selectively open and close the transfer duct.

The coke by-product removal method and removal device according to the present invention, by extracting the steam-type mixture of the tar and volatile organic compounds generated from the tar mixture to increase the flow rate by mixing the tar with the raw coal to decompose and remove at high temperatures in a dry fire extinguishing equipment, As it satisfies the legal regulations of the emission gas, it has the effect of realizing eco-friendly coke plant.

In addition, the catalytic oxidation has the advantage of reducing the cost of equipment due to the non-use and the cost of the regeneration and replacement of the catalyst need not be realized.

1 is a view showing a coke by-product removal method according to the prior art.
2 is a view showing a coke by-product removal apparatus according to a preferred embodiment of the present invention.
3 is a flowchart illustrating a coke by-product removal method according to a preferred embodiment of the present invention.
4 is a table showing the temperature in the dry fire extinguishing system in the coke by-product removal device of FIG.

2 is a view showing a coke by-products removing apparatus according to a preferred embodiment of the present invention, Figure 3 is a flow chart showing a method for removing coke by-products according to a preferred embodiment of the present invention, Figure 4 is a coke by-products removing apparatus of FIG. Is a table showing the temperature in the dry fire extinguishing system.

Referring to the drawings, the present invention is configured to extract and burn the steam-type mixture of tar (Var) and volatile organic compounds (VOCs) generated from the tar mixer (1), preferably dry fire extinguishing equipment ( 3) may be configured to burn out the mixture.

At this time, the tar mixer 1 is an accessory of the coke oven that can improve the quality of the coke as it is possible to utilize the unrefined coal having a low flow rate by mixing the tar with the charged raw coal to reinforce the fluidity.

In addition, the volatile organic compound refers to a hydrocarbon compound that volatilizes in the atmosphere to generate odor or ozone, induces odor even at low concentrations, and is directly harmful to the environment and human body as the compound itself, or participates in photochemical reactions in the atmosphere. It also generates secondary pollutants.

In addition, the dry fire extinguishing facility (CDQ; Coke Dry Quencher) (3) is a facility for extracting and extinguishing coke in a coke oven for drying a raw coal charged into a carbonization chamber for a certain period of time to produce coke. After extraction in the cooling chamber is configured to extinguish with inert circulating gas, for example nitrogen.

Then, referring to the coke by-products removal device for performing the coke by-products removal method of the present invention with reference to Figure 2, the coke by-products removal device is a transfer duct 20 connected from the tar mixer (1) to the dry fire equipment (3) ), And a transfer fan 40 and an on-off valve 60 installed in the transfer duct 20.

The transfer duct 20 is connected to an appropriate portion of the upper portion of the tar mixer 1 so that the mixture of the tar and volatile organic compounds in the form of steam from the tar mixer 1 can be easily collected. The other end may be connected to an appropriate part of the side of the dry fire extinguishing device 3 so as to be smoothly burned in the dry fire extinguishing device 3.

In addition, the conveying fan 40 provides a suction force to suck the mixture from the tar mixer 1 into the conveying duct 20, and also conveys the mixture sucked into the conveying duct 20 to the conveying duct 20 It provides its feed force to be transported through.

In addition, the opening and closing valve 60 controls the suction and the transfer through the transfer duct 20 to the inside of the transfer duct 20 by opening and closing the transfer duct 20 by the manipulation thereof.

That is, when the on-off valve 60 is opened, the suction and transfer may be smoothly performed. When the on-off valve 60 is closed, the suction and transfer may not be performed, and further, the transfer fan 40 may not transfer. At the stop, the closing of the transfer duct 20 can produce a double blocking effect.

As the coke by-product removal device is configured as described above, the coke by-product removal method of the present invention may be achieved by the coke by-product removal device.

The present invention includes an extraction step of extracting the mixture, and a removal step of burning off the extracted mixture.

The extraction step is a step of extracting a water vapor mixture of the tar (Var) and volatile organic compounds (VOCs) generated from the tar mixer (1) to increase the flow rate by mixing the tar with the raw coal.

At this time, the extraction step in detail, the suction step of sucking the vapor mixture of the tar and volatile organic compounds from the tar mixer (1) to the transfer duct 20, and the inhaled mixture to the dry fire extinguishing facility (3) It includes a transfer process to transfer.

First, a mixture of tar and volatile organic compounds generated from the tar mixer 1 is sucked into the transfer duct 20.

That is, the mixture generated from the tar mixer 1 is sucked into the transfer duct 20 connected to the dry fire extinguishing facility 3 from the tar mixer 1, and at this time, to the transfer fan 40 installed in the transfer duct 20. Thereby, the suction force into the transfer duct 20 is provided and the suction operation is performed.

Next, the sucked mixture is transferred to the dry fire extinguishing facility 3 through the transfer duct 20.

In addition, the present invention may be a control process during the suction and transfer process. That is, in a process in which the mixture is sucked into the transfer duct 20 and transferred through the transfer duct 20, the operation of the on / off valve 60 installed in the transfer duct 20 to open and close the flow path in the transfer duct 20 is performed. By this, suction and transfer of the mixture can be controlled.

This extraction step is followed by a removal step, which proceeds by decomposing and removing the steam-type mixture of tar and volatile organic compounds extracted after being generated from the tar mixer 1 at high temperature.

The mixture in the form of water vapor generated in the tar mixer 1 is a gas generated mainly from a part of tar in water vapor, tar mixed with coal dust, and vaporized tar gas, and is mainly benzene, toluene. It consists of (Toluene) and Xylene (Xylene) components.

The complexing temperature of the mixture (Benzene + Toluene + Xylene, BTX) components as described above is 550 ℃ ~ 560 ℃, it is possible to remove more than 95% at 0.5 seconds or more at 750 ℃ or more.

At this time, the removal step as described above, preferably, may be composed of a combustion process that burns in the dry fire extinguishing facility (3) in operation to decompose and remove the extracted mixture.

In the case of red coke extruded from the coke oven, the temperature is usually 1100 ° C., which is extinguished to around 200 ° C. in the dry fire extinguishing system 3. As shown in FIG. 4, the temperature inside the dry fire extinguishing facility 3 is maintained at a temperature of about 750 ° C. or more, depending on the composition of the circulating gas.

Therefore, if the high temperature inside the chamber of the dry fire extinguishing facility 3 is used, the mixture can be decomposed without a separate heat source.

The concentration of benzene, which was the most problematic in the waste gas component after the conventional catalytic oxidation, was 290 to 500 ppm, exceeding the environmental legal value of 20 ppm, but in the above-described method of removing coke by-products, the dry fire extinguishing facility 3 The concentration of benzene in the waste gas component after incineration in the chamber was 0 ppm, indicating 100% removal efficiency.

As a result, the present invention constituted as described above, by extracting the water vapor mixture of the tar and volatile organic compounds generated from the tar mixer (1) to increase the flow rate by mixing the tar with the raw coal and high heat in the dry fire extinguishing facility (3) By decomposing and removing the furnace, eco-friendly coke plant can be realized according to the legal regulations of the emission gas.

In addition, it is possible to realize the cost reduction due to the reduction of the installation cost and the need for regeneration and replacement of the catalyst due to the catalyst oxidation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

1: Tar Mixer 2: Catalytic Oxidation Furnace
3: dry fire extinguishing facility 20: transfer duct
40: transfer fan 60: on-off valve

Claims (5)

An extraction step of extracting a water vapor-type mixture of tar and volatile organic compounds (VOCs) generated from the tar mixer 1, which mixes tar with the raw coal to increase the flow rate; And
A removal step of decomposing and removing the extracted mixture at high temperature;
Coke by-products removal method comprising a.
The method of claim 1,
The removing step,
A combustion process combusting in an operating dry fire extinguishing system (Coke Dry Quencher, CDQ) 3 to decompose and remove the extracted mixture;
Coke by-products removal method characterized in that it comprises a.
The method of claim 2,
Wherein the extracting step comprises:
A suction step of suctioning the generated mixture from the tar mixer (1) to the dry fire extinguishing facility (3) and into a transfer duct (20) having a transfer fan (40); And
A transfer step of transferring the sucked mixture to the dry fire extinguishing facility 3 through the transfer duct 20;
Coke by-products removal method characterized in that it comprises a.
The method of claim 3,
Wherein the extracting step comprises:
A control process of controlling suction and transfer of the mixture by an opening / closing valve (60) installed in the transfer duct (20) to open and close the flow path in the transfer duct (20);
Coke by-products removal method characterized in that it further comprises.
A transfer duct 20 configured to communicate with the dry mixer 1 from the tar mixer 1;
The transfer duct to suck the tar-like mixture of tar and volatile organic compounds (VOCs) generated from the tar mixer 1 into the transfer duct 20 to be transferred to the dry fire extinguishing facility 3. A conveying fan 40 mounted to the 20; And
An on / off valve (60) installed to selectively open and close the transfer duct (20);
Coke by-product removal device comprising a.

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