KR102227828B1 - Coke and manufacturing method thereof - Google Patents

Abstract

The present invention relates to coke and a method for producing the same, comprising: a process of preparing a shell powder; The process of preparing coke; Cooling the coke; And a process of including shell powder in at least a part of the coke in the process of cooling the coke; including, improving the reactivity of coke, reducing the ratio of the reducing agent in the operation using the same, and the environment by using the reducing agent Pollution can be reduced.

Description

Coke and its manufacturing method TECHNICAL FIELD

The present invention relates to coke and a method for producing the same, and more particularly, to coke capable of improving reactivity and a method for producing the same.

Coke is a solid mass produced by carbonizing coal, and its main component is carbon. Coke is mainly used as a heat source required for the blast furnace and a reducing agent to reduce iron ore, and also serves to secure ventilation and liquid flow in the blast furnace.

On the other hand, in recent years, in line with _{efforts to reduce CO 2} , which is green house gas (GHG), the steel industry is also making great efforts to reduce _{CO 2 emissions.} One of them is to reduce the ratio of the blast furnace reducing agent, an energy source used in the blast furnace, by using highly reactive coke with improved reactivity.

Highly reactive coke promotes a gasification reaction that generates carbon monoxide (CO) in the low temperature region of the blast furnace. Accordingly, the temperature of the heat storage zone in the blast furnace decreases, thereby increasing the reaction efficiency, and reducing the use ratio of coke used as a reducing agent.

The reactivity of coke can be improved by a catalyst material added during the production of coke, and thus, catalyst materials such as iron-containing oxides and alkali oxides that can accelerate the gasification reaction of coke are being studied.

These catalyst materials are mainly mixed with coal and charged into a carbonization chamber and then dried at a high temperature of 1100°C or higher.

_{By the way, the iron-containing oxide reacts with the SiO 2} component constituting the refractory material of the carbonization chamber at a high temperature of about 1200° C. where the carbonization is performed to generate a low melting point compound such as 2FeO-SiO _2. Such a reaction acts as a cause of infiltrating or eroding the refractory material in the carbonization chamber, thereby reducing the life of the refractory material in the carbonization chamber.

On the other hand, in the case of using an alkali oxide as a catalyst material, there is an advantage in that the reaction as described above does not occur with the refractory material of the carbonization chamber, like an iron-containing oxide. However, since the alkali oxide is more expensive than the iron-containing oxide, there is a problem of increasing the manufacturing cost of coke.

KR 2005-0087543 A KR 2017-0011809 A

The present invention provides coke that can improve reactivity and a method for producing the same.

The present invention provides coke capable of reducing the use ratio of a reducing agent during operation of a blast furnace and a method for producing the same.

Coke manufacturing method according to an embodiment of the present invention, the process of preparing a shell (貝殼) powder; The process of preparing coke; Cooling the coke; And a process of including shell powder in at least a portion of the coke in the process of cooling the coke.

The process of preparing the shell powder may include drying the shell; And crushing the dried shell to prepare shell powder.

The process of drying the shell may include charging the shell into a drying furnace; And drying the shell by maintaining the temperature of the drying furnace at 100 to 200°C.

The process of preparing the shell powder is to crush the shell to contain 70% to 95% of the shell powder having a particle size of more than 0 mm and less than 10 mm and a particle size of more than 0 mm and less than 3 mm among the total shell powder. May include a process.

The process of preparing the shell powder may include sintering the shell; And a process of manufacturing a shell powder by crushing the fired shell.

The process of firing the shell may include charging the shell into a firing furnace; And a process of sintering the shell by maintaining the temperature of the sintering furnace at 800 to 900° C., wherein the process of sintering the shell is a process of _{pyrolyzing calcium carbonate (CaCO 3} ) contained in the shell to generate an alkali oxide. It may include.

The process of preparing the shell powder includes a shell fired to contain 50% to 95% of shell powder having a particle size of more than 0 µm and less than 1000 µm, and a particle size of more than 0 µm and less than 100 µm among the total shell powders. It may include a process of shredding.

The process of cooling the coke may include charging it into a cooling chamber; Supplying a cooling gas to the cooling chamber; And supplying shell powder to the cooling gas.

The process of including shell powder in at least a portion of the coke may include attaching shell powder to the surface of the coke; _{The process of thermally decomposing calcium carbonate (CaCO 3} ) contained in the shell powder using sensible heat of the coke to generate an alkali oxide; And a process of attaching an alkali oxide to the surface of coke.

The process of including shell powder in at least a portion of the coke includes shell powder prepared by crushing the fired shell, and attaching the alkali oxide contained in the shell powder to the surface of the coke. I can.

The process of cooling the coke may include a process of preparing the shell-containing coolant by mixing the shell powder with cooling water.

In the process of preparing the shell-containing cooling water, the cooling water may contain more than 0 parts by weight and 0.1 parts by weight or less of shell powder with respect to the cooling water.

The coke is accommodated in a container with an open top, and the process of cooling the coke may include spraying the shell-containing coolant from the top of the container.

The bottom surface of the container includes a grate in a lattice shape, and the process of cooling the coke may include a process of spraying the shell-containing cooling water from the bottom of the container.

The process of including the shell powder in at least a portion of the coke may include attaching the shell powder to the surface of the coke; _{The process of thermally decomposing calcium carbonate (CaCO 3} ) contained in the shell powder using sensible heat of the coke to generate an alkali oxide; And a process of attaching an alkali oxide to the surface of coke.

The shell powder includes shell powder prepared by crushing the fired shell, and the process of including the shell powder in at least a part of the coke may include attaching the alkali oxide contained in the shell powder to the surface of the coke. have.

The coke according to the embodiment of the present invention may contain CaO at least on its surface.

At least one of Na ₂ O and K ₂ O may be further included on the surface.

It may have a relatively higher reactivity index than coke manufactured only from carbonaceous materials.

According to an embodiment of the present invention, a highly reactive coke can be prepared by attaching shell powder to the surface of the coke in the process of cooling the coke. That is, when the shell powder is attached to the high-temperature coke, the calcium carbonate component contained in the shell powder is thermally decomposed by the sensible heat of the coke, thereby generating an alkali oxide. The alkali oxide thus produced may become a catalyst material capable of improving the reactivity of coke.

In addition, even when the shell powder prepared by firing the shell is attached to the coke, the reactivity of the coke may be improved by the alkali oxide generated while the shell is fired.

In this way, by improving the reactivity of coke, it is possible to reduce the proportion of the reducing agent in the operation using the same, and it is possible to reduce environmental pollution caused by the use of the reducing agent.

In addition, since the reactivity of coke can be improved by using the shell, which is one of the wastes, the cost of purchasing a catalyst material can be reduced, and environmental pollution caused by the shell can be improved.

1 is a flow chart showing a method of manufacturing coke according to an embodiment of the present invention.
2 is a flow chart illustrating a method of preparing shell powder in a method for manufacturing coke according to an embodiment of the present invention.
3 is a flow chart showing a modified example of preparing a shell powder.
4 is a flow chart showing a method of cooling coke using a dry cooling method in a method for manufacturing coke according to an embodiment of the present invention.
5 is a flow chart showing a method of cooling coke using a wet cooling method in a method for manufacturing coke according to an embodiment of the present invention.
6 is a graph showing the results of experimenting the reactivity of coke manufactured by applying a dry cooling method.
7 is a graph showing the results of an experiment on the reactivity of coke manufactured by applying a wet cooling method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and the scope of the invention to those of ordinary skill in the art. It is provided to be fully informed.

In the method for producing coke according to an embodiment of the present invention, a shell may be used as an additive for improving the reactivity of coke.

Here, the shell can mean the shells of shellfish, such as clam shells, oyster shells, conch shells, and scallop shells, and occurs in large quantities in coastal areas or in areas where shellfish are cultivated and processed. Such shells contain a large amount of calcium carbonate (CaCO ₃ ), and are thermally decomposed into quicklime (CaO) and carbon dioxide (CO _{2) at a high temperature of 800°C or higher.} In this case, quicklime (CaO) is an alkali oxide and may be used as a catalyst material that can improve the reactivity of coke, that is, reactivity with carbon dioxide.

Therefore, in an embodiment of the present invention, a highly reactive coke can be prepared by attaching the shell powder to the surface of the coke in the process of cooling the coke and distributing the catalyst material generated from the shell powder to the coke.

1 is a flow chart showing a method of manufacturing coke according to an embodiment of the present invention, FIG. 2 is a flow chart showing a method of preparing shell powder in the method of manufacturing coke according to an embodiment of the present invention, and FIG. 3 is A flow chart showing a modified example, and FIG. 4 is a flow chart showing a method of cooling coke by a dry cooling method in the coke manufacturing method according to an embodiment of the present invention, and FIG. 5 is a wet method in the coke manufacturing method according to an embodiment of the present invention. It is a flow chart showing a method of cooling coke by cooling method.

Referring to FIG. 1, the coke manufacturing method according to the present invention includes a process of preparing shell powder (S100), a process of preparing coke (S200), a process of cooling coke (S300), and a process of cooling the coke. In the process of including the shell powder in coke (S400) may be included.

Referring to Figure 2, the process of preparing the shell powder, the process of preparing the shell (S110), the process of drying the shell (S112), the process of crushing the dried shell to produce the shell powder (S114), and It may include a process of storing the shell powder (S116).

A shell that can be used as a catalyst material for improving the reactivity of coke may be provided. Shells occur in large quantities in coastal areas or in areas where shellfish are cultivated and processed, and can be continuously supplied from such areas.

Shell contains 95% of inorganic salts (most of them are calcium carbonate (CaCO ₃ ), calcium phosphate (Ca ₃ (PO ₄ ) ₂ ) 1~2%, magnesium carbonate (MgCO ₃ ) 0.5% or less) and proteinaceous conchiolin And the like.

Calcium carbonate (CaCO _{3 ) contained in the shell is pyrolyzed into carbon dioxide (CO 2} ) and quicklime (CaO) at a high temperature of 800°C or higher. The quicklime produced in this way is an alkali oxide and can be usefully used as a catalyst material for improving the reactivity of coke.

When the shell is prepared, moisture contained in the shell can be removed by drying the shell in a drying furnace. At this time, the temperature of the drying bath may be maintained at a temperature sufficient to remove moisture contained in the shell, for example, about 100 to 200°C. If the moisture contained in the shell is not removed, the crushed shell powder may stick together to form a lump, so it is recommended to dry the shell before crushing. In addition, when the shell is dried, its strength is lowered and it is brittle, so it is easy to crush.

Thereafter, when the shell is dried, the shell can be crushed in a crusher to make shell powder. The shell powder has a particle size of more than 0 mm and less than 10 mm, and the fraction of the shell powder having a particle size of more than 0 mm and less than 3 mm out of the total shell powder occupies 70% or more, more preferably 70 to 95%. Can be manufactured.

The shell powder thus prepared may be supplied to the surface of the coke in the process of cooling the coke. At this time, the shell powder may not only adhere to the surface of the coke, but also may flow into the pores formed in the coke. Therefore, the particle size of the shell powder can be manufactured to be more than 0 mm and 10 mm or less so that the contact area and adhesion between the shell powder and the coke can be improved, and the shell powder can be smoothly introduced into the pores formed in the coke. In addition, when the particle size of the shell powder is prepared so that the fraction of shell powder having a particle size of more than 0 mm and 3 mm or less among the total shell powder accounts for 70 to 95%, the contact area and adhesion with coke will be further improved. I can.

When the shell powder is prepared, the shell powder may be stored in a shell powder storage hopper (S116).

Meanwhile, the shell powder may be prepared in the following manner.

Referring to Figure 3, the process of preparing the shell powder, the process of preparing the shell (S120), the process of sintering the shell (S122), the process of crushing the fired shell to prepare the shell powder (S124), and , It may include a process of storing the shell powder (S126). Here, a shell powder may be prepared by sintering the shell at a temperature capable of thermally decomposing calcium carbonate among shells, and then crushing the fired shell.

When the shell is provided, the shell is charged in the firing furnace, and the shell can be fired by maintaining the temperature of the firing furnace at about 800 to 900°C. The temperature suggested here is a temperature at which the calcium carbonate contained in the shell can be thermally decomposed, and it is not necessary to maintain the temperature of the kiln higher than the suggested range.

When the shell is fired in this way, calcium carbonate in the shell may be pyrolyzed into _{quicklime (CaO) and carbon dioxide (CO 2 ).} Here, quicklime (CaO) can be used as a catalyst material that can improve the reactivity of coke.

Table 1 below shows the results of analyzing the components by collecting the sintered shell residue after firing the shell at a temperature of about 900°C.

ingredient Content (wt%) SiO ₂ 0.1 Al ₂ O ₃ 0.1 CaO 52 K ₂ O 0.4 Na ₂ O One P ₂ O ₅ 0.3 SrO 0.6 SO ₃ 0.4 Fe ₂ O ₃ 1.1 L.I.(Loss of Ignition) 44

Referring to Table 1 above, it can be seen that when the shell is fired, the calcium carbonate (CaCO ₃ ) component contained in the shell is thermally decomposed to generate quicklime (CaO). At this time, quicklime (CaO) occupies more than half of the remnants of the fired shells. The resulting quicklime (CaO) is an alkali oxide, and is contained in coke and can be used as a catalyst material that can improve the reactivity with _{carbon dioxide (CO 2) during operation of a blast furnace.} In addition _{, it can be seen that about 1.4wt% of K 2} O and Na ₂ O are included, and these alkali oxides can also help to improve the reactivity of coke.

Thereafter, the fired shell may be crushed in a crusher to prepare a shell powder. At this time, the shell powder may have a particle size of more than 0 μm and less than or equal to 1000 μm, and may be prepared to include 50% to 95% of the shell powder having a particle size of more than 0 μm and less than or equal to 100 μm.

The sintered shell is easy to crush because the strength is very weak compared to the dried shell. Accordingly, a shell powder having a smaller particle size than when the dried shell is crushed can be prepared. When the particle size of the shell powder is reduced in this way, there is an advantage of further improving the reactivity of coke as well as adhesion to coke.

When the shell powder is prepared, the shell powder may be stored in a shell powder storage hopper (S126).

The process of preparing coke can be carried out as follows.

First, the raw coal loaded in the yard is crushed to have a certain size in a crusher and then stored in the coal ash storage hopper.At this time, various types of raw coal can be used, and it is called raw coal before crushing, and it is called coal ash after crushing.

The carbon material has a particle size of more than 0 mm and less than 10 mm, and the carbon material having a particle size of more than 0 mm and less than 3 mm out of the total carbon material can be manufactured to have a fraction of 70% or more, more preferably about 70 to 95%. have.

Next, various types of carbonaceous material stored in the carbonaceous material storage hopper are discharged at a certain mixing ratio, mixed, and then stored in a storage tank of a coke oven. Further, if necessary, moisture contained in the carbonaceous material may be removed through a separate drying treatment, and then stored in a storage tank of a coke oven.

Thereafter, the carbon material stored in the storage tank is charged into the carbonization chamber of the coke oven and dried to produce coke. At this time, the temperature of the carbonization chamber may be maintained at 1100°C or higher.

When the coal is dried and coke is produced, the coke can be extruded in the carbonization chamber using an extruder. The coke extruded from the carbonization chamber may be charged to a bucket or a cart according to a cooling method and then transferred to a coke cooling facility.

Meanwhile, the coke cooling facility may be divided into a dry cooling method for cooling coke in a red heat state using a cooling gas and a wet cooling method for cooling coke in a red heat state using cooling water.

The dry cooling method is a method of cooling the coke by supplying a cooling gas such as nitrogen gas or the like to the cooling chamber after loading the red-heated coke into a sealed cooling chamber. In the wet cooling method, the red-hot coke manufactured in the carbonization chamber is extruded and charged into a container such as a bogie with an open top, and the container is moved to a wet cooling facility, and then the cooling water from the top of the container or the top and bottom of the container It is a method of cooling coke by spraying.

In an exemplary embodiment of the present invention, shell powder may be attached to the coke in the process of cooling the red-heated coke, and both the dry cooling method and the wet cooling method described above may be applied.

First, a method of including shell powder in coke in a process of cooling coke by a dry cooling method will be described with reference to FIG. 4.

After transferring the bucket in which coke is charged to the dry cooling facility (S310), coke may be charged into the cooling chamber of the dry cooling facility (S312).

Next, a cooling gas such as nitrogen gas may be supplied to the cooling chamber to cool the coke. In this case, the cooling gas is supplied through the lower portion of the cooling chamber, and the cooling gas moves upward in the cooling chamber to cool the coke.

In this way, in the process of supplying the cooling gas to the cooling chamber, the shell powder may be added to the cooling gas. Accordingly, the shell powder may be mixed with the cooling gas and supplied into the cooling chamber. The cooling gas supplied to the cooling chamber, that is, the cooling gas in which shell powder is mixed, may contact the coke to cool the coke. In addition, the shell powder mixed with the cooling gas may adhere to the surface of the coke and flow into the pores formed in the coke.

The shell powder introduced into the cooling gas may be a shell powder prepared by drying and crushing the shell, for example, a first shell powder, or may be a shell powder prepared by crushing the shell and then crushing, such as a second shell powder. Alternatively, if necessary, a mixture of the first shell powder and the second shell powder may be added to the cooling gas.

When the first shell powder is added to the cooling gas, calcium carbonate contained in the first shell powder is pyrolyzed by the sensible heat of coke to generate quicklime (CaO). The produced quicklime can be used as a catalyst material that can improve the reactivity of coke by being attached to the surface of coke.

In addition, when the second shell powder is added to the cooling gas, quicklime (CaO) contained in the second shell powder is attached to the surface of the coke, so that it can be used as a catalyst material that can improve the reactivity of the coke. That is, since the second shell powder is pyrolyzed during the manufacturing process, it does not require a separate pyrolysis process and can be attached to the surface of the coke.

When the coke is cooled in this way, a catalyst material capable of improving the reactivity of coke, such as quicklime, can be attached to the surface of the coke and introduced into the pores of the coke at the same time, thereby producing highly reactive coke (S400).

Next, a method of including shell powder in coke in a process of cooling coke by a wet cooling method will be described with reference to FIG. 5.

First, the shell powder prepared above may be mixed with the cooling water used to cool the coke to prepare the shell-containing cooling water (S320). At this time, the shell powder mixed with the cooling water may be a shell powder prepared by drying and crushing the shell, a first shell powder, or may be a shell powder prepared by crushing the shell after firing, such as a second shell powder.

When preparing the shell-containing coolant by mixing the first shell powder with the coolant, the first shell powder may be used in an amount greater than 0 parts by weight and 0.1 parts by weight or less, preferably greater than 0 parts by weight and 0.05 parts by weight or less, based on the cooling water. Although the amount of the first shell powder used may be increased more than the suggested range, the reactivity of coke may be sufficiently improved even in the suggested range.

After the first shell powder is mixed with the cooling water, a process of stirring the cooling water, that is, the shell-containing cooling water may be performed. This is because the first shell powder is not uniformly dispersed in the cooling water and may sink, and thus, the content of the first shell powder in the cooling water containing shells in the coke may be non-uniform. Therefore, if the shell-containing cooling water is stirred and the first shell powder is evenly dispersed in the cooling water, and then the shell-containing cooling water is supplied to the coke, there is an advantage that the first shell powder in the shell-containing cooling water can be uniformly attached to the coke.

And when the second shell powder is mixed with the cooling water, the second shell powder may be used in an amount greater than 0 parts by weight and 0.05 parts by weight or less, preferably greater than 0 parts by weight and 0.03 parts by weight or less, based on the cooling water. In this case, the second shell powder may be used relatively less than the first shell powder. This is because the second shell powder is prepared in a state in which calcium carbonate in the shell is pyrolyzed by firing the shell, and thus contains a large amount of an active ingredient, that is, an alkali oxide used as a catalyst material, compared to the first shell powder.

When the shell-containing cooling water is provided in this way, the bogie charged with coke may be moved to the wet cooling facility (S322).

Thereafter, the coke may be cooled by supplying or spraying the shell-containing coolant to the bogie (S324). At this time, the shell-containing cooling water may be supplied from the top of the bogie, or may be supplied from the top and bottom of the bogie at the same time. That is, the top of the bogie is opened so that coke can be charged, and the bottom, that is, the bottom surface, may include a grate in a lattice shape to discharge cooling water. Therefore, the shell-containing cooling water can be simultaneously supplied from the top and bottom of the bogie.

In the process of cooling the coke by supplying the shell-containing cooling water to the coke in the wet cooling facility, the shell powder contained in the shell-containing cooling water may flow into the surface of the coke and the pores formed in the coke.

When the shell-containing cooling water containing the first shell powder, for example, the cooling water containing the first shell, is supplied to the coke, the first shell powder is pyrolyzed into quicklime (CaO) by the sensible heat of the coke loaded in the bogie and is included in or coated in the coke. I can.

And when the shell-containing cooling water containing the second shell powder, for example, the cooling water containing the second shell, is supplied to the coke, the second shell powder is already pyrolyzed into quicklime during the manufacturing process, so the quicklime contained in the second shell powder is reduced. It may be contained in coke or coated.

On the other hand, since the coke charged in the bogie is at a high temperature of 1100°C or higher, when it comes into contact with the shell-containing cooling water, a phenomenon such as cracking or splashing occurs due to thermal shock due to the extreme temperature difference with the shell-containing cooling water. By spraying the shell-containing coolant onto the coke accumulated in the cart by using such a phenomenon, the shell powder contained in the shell-containing coolant may be included or adhered to the entire coke charged in the cart.

When the coke is cooled in this way, a catalyst material that can improve the reactivity of coke, such as quicklime, can be attached to the surface of the coke and introduced into the pores of the coke at the same time, so that highly reactive coke can be manufactured (S400).

If coke is produced in this way, a catalyst material capable of improving the reactivity of coke can be secured from shells being treated as waste, and thus an increase in cost due to the purchase of the catalyst material can be suppressed. In addition, it is possible to suppress environmental pollution caused by shells in areas where shells are generated, and reduce the cost required to treat shells.

Hereinafter, an experimental example for evaluating the quality of coke manufactured by the coke manufacturing method according to an embodiment of the present invention will be described.

6 is a graph showing the results of an experiment on the reactivity of coke manufactured by applying a dry cooling method, and FIG. 7 is a graph showing the results of an experiment on the reactivity of coke manufactured by applying a wet cooling method.

In this experiment, the quality of coke containing shell powder on its surface was evaluated in the process of cooling the coke.

Carbon ash and shell powder were prepared for the experiment.

Carbonaceous materials are mixed with 10 types of single coals, and the carbonaceous material has a particle size of more than 0mm and 10mm, and 83% of the total carbonaceous material has a particle size of more than 0mm and less than 3mm, and the moisture content is 9%. Prepared to have.

The components of the carbon material used here are shown in Table 1 below.

Industrial analysis Elemental analysis ingredient Combined water
(IM) Ash
(ASH) Volatile matter
(VM) Fixed carbon
(FC) sulfur
(TS) carbon
(C) Hydrogen
(H) nitrogen
(N) Oxygen
(O) Content (wt%) 1.3 9.11 27.3 62.29 0.6 87.6 6.8 1.6 3.4

(IM(inherent moisture), ASH(ash content), VM(volatile matter), FC(fixed carbon), TS(total surphur), C(carbon), H(hydrogen), N(nitrogen), O(oxigen) )

Then, the shell powder was sintered at 850° C., and then crushed to have a particle size of more than 0 μm and less than 1000 μm using a crusher. At this time, the shell powder was prepared so that 80% of the shell powder having a particle size of more than 0 µm and less than 100 µm among the total shell powders was.

Some of the shell powder thus prepared was left as it is, and the rest was mixed with water, and used to prepare shell-containing cooling water for cooling coke. When preparing the shell-containing cooling water, the shell powder was used in an amount of 0.02 parts by weight based on water.

The prepared carbonaceous material was filled in a wood box to have a loading density of about 730 kg/m 3. At this time, the wooden box has a capacity of 30 kg/charge.

Thereafter, a wooden box filled with carbon material was put into a coke test furnace to prepare coke. The coke test furnace used in this experiment can be equipped with an electric heater so that heat transfer occurs from both walls in the same manner as a commercial coke oven. A wooden box filled with carbon material was charged into a coke test furnace heated to 650° C., and heated at a rate of 2.7° C./min to 1080° C. lower than 1100° C., which is a temperature required for manufacturing actual metallurgical coke. And when the center temperature of the coke test furnace reached 1000° C., it was maintained for 1 hour to prepare coke.

Thereafter, coke was extruded in a coke test furnace, and then some of the extruded red coke was charged into a dry cooling facility and cooled by supplying nitrogen gas mixed with shell powder (Sample 1). In addition, some of the extruded red coke was charged into a wet cooling facility and cooled by supplying shell-containing cooling water mixed with shell powder (Sample 2).

And the reactivity and hot strength were measured by the following method using each of the cooled coke, and the measurement results are shown in FIGS. 6 and 7.

First, coke, for example, sample 1 is crushed to select 200 g of coke having a size of about 19 to 21 mm. Then, the selected coke _{was charged into a reactor in a CO 2} atmosphere, and then maintained at 1100° C. for 120 minutes. Thereafter, when the temperature of the reactor was cooled to about 50° C., the coke remaining in the reactor was weighed, and the Coke Reactivity Index (CRI) was calculated using Equation 1 below. Here, the coke reactivity index indicates the degree of reactivity between coke and carbon dioxide, and the larger the value, the better the reactivity between coke and carbon dioxide.

In addition, the reactivity index for Sample 2 was calculated by performing an experiment in the same manner as above for Sample 2 as well.

Referring to FIGS. 6 and 7, it can be seen that when the shell powder is included in the coke in the process of cooling the coke, the reactivity of the coke is improved compared to the case where the shell powder is not used at all, regardless of the amount of the shell powder used. In other words, when the coke contains even a small amount of shell powder, the reactivity of coke may be improved.

It can be seen that when the coke contains the same amount of shell powder, the reactivity of the coke cooled by the wet cooling method appears slightly higher than the coke cooled by the dry cooling method. This is thought to be because the coke cooled by the wet cooling method can be introduced deeper from the surface of the coke as the coke is cracked or cracked by the thermal shock generated by the temperature difference with the cooling water during the cooling process.

From these results, it was confirmed that when the shell was contained in coke, calcium carbonate contained in the shell was pyrolyzed into quicklime (CaO) and distributed to the coke, thereby improving the reactivity of the coke.

As described above, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention is limited to the described embodiments and should not be defined, and should be defined not only by the claims to be described later, but also by the claims and equivalents.

Claims (19)

The process of preparing shell powder;
The process of preparing coke;
Cooling the coke; And
Including; a process of including shell powder in at least a portion of the coke in the process of cooling the coke,
The process of preparing the shell powder,
The process of firing the shell; And
Including; the process of manufacturing a shell powder by crushing the fired shell,
The process of including shell powder in at least a portion of the coke,
Attaching shell powder to the surface of the coke;
_{The process of thermally decomposing calcium carbonate (CaCO 3} ) contained in the shell powder using the sensible heat of the coke to generate an alkali oxide; And
Coke manufacturing method comprising a; process of attaching an alkali oxide to the surface of the coke. delete delete delete delete The method according to claim 1,
The process of firing the shell,
Charging the shell into the kiln; And
Including; the process of firing the shell by maintaining the temperature of the firing furnace at 800 to 900 ℃,
The process of sintering the shell _{includes a step of pyrolyzing calcium carbonate (CaCO 3} ) contained in the shell to generate an alkali oxide. The method of claim 6,
The process of preparing the shell powder,
Coke manufacturing method comprising the process of crushing a fired shell to contain 50% to 95% of shell powders having a particle size of more than 0 µm and less than 1000 µm and having a particle size of more than 0 µm and less than 100 µm . The method according to any one of claims 1, 6 and 7,
The process of cooling the coke,
Charging the cooling chamber;
Supplying a cooling gas to the cooling chamber; And
Coke manufacturing method comprising; supplying shell powder to the cooling gas. delete The method of claim 8,
The process of including shell powder in at least a portion of the coke,
Coke manufacturing method comprising the step of adhering the alkali oxide contained in the shell powder to the surface of the coke. The method according to any one of claims 1, 6 and 7,
The process of cooling the coke,
Coke manufacturing method comprising the step of preparing the shell-containing cooling water by mixing the shell powder with cooling water. The method of claim 11,
The process of preparing the shell-containing cooling water,
A method for producing coke, in which shell powder of more than 0 parts by weight and less than 0.1 parts by weight of the cooling water is mixed with cooling water. The method of claim 12,
The coke is accommodated in a container with an open top,
The process of cooling the coke,
Coke manufacturing method comprising the step of spraying the shell-containing cooling water from the top of the container. The method of claim 13,
The bottom surface of the container includes a grid-shaped grate,
The process of cooling the coke,
Coke manufacturing method comprising the step of spraying the shell-containing cooling water from the lower portion of the container. delete The method of claim 13,
The process of including shell powder in at least a portion of the coke,
Coke manufacturing method comprising the step of adhering the alkali oxide contained in the shell powder to the surface of the coke. delete delete delete

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