KR20060076951A - Apparatus for manufacturing coke and method of the same - Google Patents

Abstract

Disclosed is an apparatus and a method for producing high-charging coke with charged coal raw materials. Such a coke manufacturing apparatus includes a coal humidifier for mixing coal and oil, a storage tank connected to the coal humidifier and supplying oil to the coal humidifier by storing oil, and provided in the storage tank to maintain oil. Temperature control means capable of maintaining the temperature range, and circulation means for returning oil from the coal humidifier to the storage tank. Such coke manufacturing apparatus and manufacturing method has the advantage that the coke strength is increased by mixing waste cooking oil with coal at a certain ratio, and the strength trend is uniformly formed by discharging oil quantity, thereby increasing the cost of using ordinary coal and reducing costs. have.

Coke, coal, oil, dry matter, charging

Description

Apparatus and method for manufacturing high strength coke with charged coal raw material {APPARATUS FOR MANUFACTURING COKE AND METHOD OF THE SAME}

1 is a diagram showing the structure of a carbonization chamber according to a preferred embodiment of the present invention.

Figure 2 is a schematic diagram showing a waste cooking oil adding device according to a preferred embodiment of the present invention.

3 shows the structure of a waste cooking oil mixer.

Figure 4 is a graph showing the relationship between the oil addition ratio and density when added to the waste cooking oil according to a preferred embodiment of the present invention.

5 is a graph showing the relationship between the oil addition ratio and cold strength when the waste cooking oil according to a preferred embodiment of the present invention is added.

Figure 6 is a graph showing the relationship between the oil addition ratio, loading density, and water when the waste cooking oil according to a preferred embodiment of the present invention.

Figure 7 is a graph showing the measurement results of the actual bullet pressure when the addition of waste cooking oil.

8 is a graph analyzing the impact of coking pressure and coke quality upon addition of waste cooking oil.

The present invention relates to an apparatus and a method for producing coke of charged coal raw material, and more particularly, to coking coal-loaded raw material for producing coking coal, which is capable of improving strength by charging and drying the waste cooking oil with coke. It is about a method.

Generally, in steel mills, coke is placed in yards and charged into a carbonization chamber using a charging car to produce coke.

The steel coke acts as a structural member supporting weight in addition to the reducing material, which is a main fuel of blast furnace smelting.

Therefore, if the coke is loaded into a large blast furnace of 5,000 m 3 in order to use as a structural material and cannot withstand the weight of iron ore deposited, it is impossible to secure a passage for hot air.

As a result, strong caking is required to make coke with the strength required for this.

However, such a conventional coke has a problem that the cold strength of the blast furnace decreases due to the use of low-grade coal, and the use ratio of the low-grade coal is high.

In addition, since the use of the lumped coke is avoided as the amount of the coke is increased, there is a problem that the coke strength is lowered due to the variation in the cold strength due to the particle size and the moisture variation due to frequent mixing changes.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a coke manufacturing apparatus and method that can improve the strength by charging, drying and mixing the waste cooking oil to the coke during charging coal production. It is.

In order to achieve the above object, a preferred embodiment of the present invention is a coal humidifier for mixing coal and oil; A storage tank connected to the coal humidifier and supplying oil to the coal humidifier by storing oil; Temperature control means provided in the storage tank and capable of maintaining oil in a predetermined temperature range; And it provides a coke manufacturing apparatus comprising a circulation means for returning the oil from the coal humidifier to the storage tank.

In addition, another object of the present invention comprises the steps of mixing coal and oil with each other in a coal humidifier; And it provides a coke production method comprising the step of charging and drying the coal and oil mixed in the above step into a carbonization chamber provided in the coke oven.

Hereinafter, with reference to the accompanying drawings will be described in detail the apparatus and method for producing coke according to a preferred embodiment of the present invention.

As shown in Figure 1, the coke manufacturing apparatus and method proposed by the present invention after mixing the coal 30 and a predetermined amount of the waste cooking oil 50 in the carbonization chamber 20 provided in the coke oven (10) It can manufacture by the process of charging and carbonizing the carbonization chamber 10 of coke oven to the charging vehicle 40.

At this time, the strength of the coke may be determined according to the addition ratio of the waste cooking oil 50 added to the coal (30).

And, the apparatus for adding waste cooking oil to such coke is shown in Figs.

As shown in the drawing, first, by adding the waste cooking oil 50 to the inside of the dryer 52 provided in the Coal Moisture Control Process (CMCP) 51, coke may be manufactured.

In more detail, a storage tank 54 for storing waste cooking oil is connected to one side of the coal humidification facility 51.

In addition, the storage tank 54 may be provided with an oil pump to supply waste cooking oil stored in the storage tank to a coal humidification facility.

The upper portion of the storage tank 54 is formed with an inlet 55 through which the waste cooking oil can be injected, thereby storing the waste cooking oil into the storage tank 54.

The storage tank 54 is provided with a temperature control means 61. The temperature control means 61 is provided with a temperature control valve 60 and the heating device 56 can maintain the waste cooking oil within a predetermined temperature range.

That is, when the temperature falls inside the storage tank 54, the waste cooking oil is precipitated or solidified, thereby using the heating device 56 and the temperature control valve 60.

The lower portion of the storage tank 54 is equipped with a strainer 59 to prevent the oil pump 58 from being blocked.

Accordingly, when the waste cooking oil in the storage tank 54 is hardened or clogged, the waste cooking oil can be discharged to the outside using the strainer 59.

In addition, as described above, the coal humidifier 51 and the storage tank 54 are controlled by the controller 53 so that the waste cooking oil can be efficiently added to the coke.

And, by further installing an oil flow control valve (not shown) it is possible to adjust the amount of oil supplied to the coal humidifier.

In addition, when the coal humidification device 51 is provided with a circulation device 63 and the coal input is stopped, the waste cooking oil is returned to the storage tank 54 by the circulation device 63.

As such, when the waste cooking oil is mixed with coal at a predetermined ratio, coke of appropriate strength can be produced.

At this time, dry cooking oil, molasses, and waste cooking oil were mixed with 0.1-0.5% of the blended coal to dry matter, and the result was the optimum condition when mixing 0.3% of the cooking oil, and the loading density was improved by 50.7 kg / m3 (7.9% increase). .

On the other hand, the results of experimenting with the various physical properties of the coke prepared by adding waste cooking oil to coal as described above is shown below.

4 is a graph showing the relationship between oil addition ratio and density when waste cooking oil is added.

As shown, when the charge density is increased, the distance between particles is narrowed to increase the bonding force, and the coke volatile structure is developed due to low molecular pyrolysis gas release delay, thereby increasing the coke strength.

In addition, the coke strength effect according to the loading density of single coal is improved by 2% of cold strength when the final drying temperature is 1100 ??, the drying time is 18 hr and the loading coal particle size is 80% (-3mm). .

And, as shown in Figure 5, the coke strength effect according to the loading density of the coal blend is improved DI150 1.3 ~ 3.0 by increasing the loading density 80kg / m3 (0.08Ton / m3), the coke strength to 10kg / m3 loading density Has an effect of about 0.2% increase.

In addition, it can be seen that the DI150 is increased by 1.3 to 3.0 due to the increase of the charge density of 80kg / m3 (0.08Ton / m3), and the coke strength is increased by about 0.2% by the increase of the charge density of 10kg / m3.                     

On the other hand, the present invention, as shown in Table 3 below, in order to determine the cause of the rise of the product coke strength when charging the waste cooking oil (50) in the coke oven 10, supplying the waste cooking oil (50) to coal This study investigated the loading density distribution analysis in Shiloh.

As a result, the ballistic pressure (f) has a constant distribution (normal distribution) centering on the average value between the carbonization chambers in the silo, and the variation in the weighting pressure between the carbonization chambers in the silo is quite large. Factors affecting the loading density are moisture and particle size, and in particular, it is controlled by moisture, so it is necessary to reduce the charge variation of the charged coal, so that the water effect: 12.5 (Kg / ㎥), moisture 1 (%), particle size influence: 0.1 (Kg / ㎥), particle size 1 (%) loading coal water deviation decreases, and when the particle size is up, the loading density (coal pressure) deviation between the carbonization chambers is reduced.                     

And, as shown in Table 4, in the case of operating by adding the waste cooking oil 50 to the coal, as a result of the impact of coal pressure and coke quality, the measurement results of the flowability and expandability, respectively, in accordance with the dry distillation conditions by the test ) → 1050 degrees (1 hour), 1050 degrees (7 hours).

In other words, as the loading density increases, the pressure of coal loading increases, in particular, it shows a tendency of high loading pressure in the low moisture region, and the coke quality shows an upward trend due to the loading density in the low moisture region.                     

On the other hand, as shown in Figure 6, when the waste cooking oil is added to change the charging charcoal appearance shows the impact of the loading density (coal pressure impact factor).

As shown, it can be seen that the strength of the coke is reduced according to the charging coal moisture conditions.

That is, in the low moisture region (below 6.0), the effect of loading density was small when 0.2% of waste cooking oil was added. In the high moisture region (8.0% or more), the loading density was increased when the waste cooking oil was added.

In addition, when operating under the condition of 82% of CMCP particle size, the loading density of waste cooking oil is considered to be weak when the coal coal drops. I could see the result.

And, Figure 7 is a graph showing the measurement results of the actual bullet pressure when the waste cooking oil is added.

As shown, based on the results of the test for measuring the ballistic pressure, the coke strength when the waste cooking oil was added to the coal and dried according to the loading amount and the charging method was examined.

In the pyrolysis process of the waste cooking oil mixed coal, it was confirmed that the flowable substances formed by coal melting at the time of coking coalesce themselves and bind to agglomerates.

As described above, the key factors influencing the cold coke cold strength of the waste cooking oil addition test results are fluidity, degree of coalification, moisture of inert and coal, furnace temperature, and drying time.

In addition, the strength index, reflectance, and coke factor values indicating the degree of coalification were analyzed to cause strong interactions with each other.

In the blended waste cooking oil mixing test, the cold strength was found to be strongly influenced by the range of duct melt, depending on the fluidity and strength index.

In conclusion, it is possible to find the key factors affecting coke strength by using various statistical techniques and test furnaces, and to use these factors to improve the strength estimation formula, derive the optimum conditions, and evaluate the affinity between the different types of coal. It is expected to contribute to the stable management of coke quality while increasing the use of low quality coal.

 As described above, in the coke production apparatus and method according to a preferred embodiment of the present invention, the coke strength is increased by mixing the waste cooking oil with coal at a predetermined ratio, and the strength trend due to the oil quantity is uniformly formed, thereby making it a general coal. There is an advantage that the cost can be reduced by increasing the use cost.

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 is within the scope of the present invention.

Claims (4)

A coal humidifier for mixing coal and oil; A storage tank connected to the coal humidifier and supplying oil to the coal humidifier by storing oil; Temperature control means provided in the storage tank and capable of maintaining oil in a predetermined temperature range; And Apparatus for producing coke comprising a circulation means for returning the oil from the coal humidifier to the storage tank. The method of claim 1, The oil is coke production apparatus comprising an edible oil. Mixing coal and oil with each other in a coal humidifier; And Coke production method comprising the step of charging the coal and oil mixed in the step into a carbonization chamber provided in the coke oven and carbonized. The method of claim 3, wherein In the step of mixing the oil with coal, the oil is stored in a storage tank, and pumped by an oil pump to supply oil to the coal humidifier.

Images