KR101760576B1

KR101760576B1 - Method for produce of reforming coal using pulverized coal

Info

Publication number: KR101760576B1
Application number: KR1020150154936A
Authority: KR
Inventors: 장동민; 최재훈; 김현용
Original assignee: 주식회사 포스코
Priority date: 2015-11-05
Filing date: 2015-11-05
Publication date: 2017-07-24
Also published as: KR20170053186A

Abstract

The method for producing modified coal using pulverized coal according to the present invention comprises the steps of spraying and coagulating molten polymer in pulverized coal, cooling the coagulated pulverized coal to produce raw coal, pressurizing and heating the pulverized coal to remove moisture and volatile substances And molding and cooling the paste-like raw coal into a pellet shape. In the step of producing the raw coal, the melting point of the polymer is further lowered by addition of oil.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a coal using pulverized coal,

The present invention relates to a method for producing a modified coal using pulverized coal, and more particularly, to a method for producing a modified coal using pulverized coal which coagulates pulverized coal and mixes the pulverized coal with a polymer to produce modified coal.

The production of bituminous coal, especially used for coke production, has been on a declining trend globally, and the price of bituminous coal is steadily increasing accordingly. In order to overcome this problem, researches are being conducted to produce coke using non-ferrous metals such as lignite and anthracite, which are relatively inexpensive compared to bituminous coal.

However, lignite and anthracite are less cohesive than bituminous coal, and there is a problem that volatile substances of aromatic are too much or too small compared to bituminous coal. Therefore, in the past, the use of such non-veined-carbon steels was limited in applications other than the purpose of controlling the degree of carbonization of the compounded carbon.

In addition, a large amount of pulverized coal is generated in the drying process for efficiently utilizing the low-grade non-ferrous metal of the grade. When such a fine powder flows out to the air, it causes environmental pollution, .

Conventionally, coal liquefaction has been used as a method for modifying coal. Modification through coal liquefaction is accomplished by melting coal at high temperatures, removing oxygen from the molten coal and donating hydrogen.

However, since such a process requires very high pressure and temperature, there is a problem that the cost for constructing the apparatus is increased and the operation cost is also increased.

On the other hand, polymer materials such as waste plastics are not easily decomposed in the natural world, and they are regarded as a main cause of environmental pollution. However, thermoplastic plastics have a low melting point and are easily melted, so they have excellent cohesion and contain a large amount of aromatic materials.

Therefore, when the coal is modified by using the fine grain of the non-ferrous metal and the plastic, the coke can be produced by using it.

(Japanese Patent Registration No. 3995496 (Aug. 10, 2007)) discloses a method of adding waste plastics to pulverized coal and mixing the pulverized coal, followed by pressure molding to produce coarse aggregate.

However, since the above-mentioned invention uses pulverized coal for general coke, which is not a non-veined coal, the cost of raw material is much higher than that of using non-ferrous coal.

Further, when the location of the pulverized coal is different from the location of the reformer, a large amount of cost is required for transporting the pulverized coal, and there is a risk that the environment is contaminated by the pulverized coal.

FIG. 1 shows a method for producing a modified coal by mixing a conventional non-vealed-fly-coal and a high-molecular material. As shown in the figure, the granulated metallic clay C1 and the polymer material P are crushed in crushers 11 and 12, mixed in a mixer 30, and then reacted in a reaction part 40 at high temperature and high pressure, And then molded and cooled into a desired shape at the injection part 50 to produce the modified coal C.

In this process, there is a need for a method for producing modified coal by using a non-granular iron-based coal. It is possible to coagulate the pulverized coal primarily to facilitate transportation, and to mix the pulverized coal with the polymer material to produce a modified coal, thereby reducing the manufacturing cost of the reformed coal.

Japanese Patent No. 3995496 (Aug. 10, 2007)

SUMMARY OF THE INVENTION The present invention has been conceived to solve such problems, and an object of the present invention is to provide a method for producing a modified coal by mixing a fine powder of a non-ferrous metal with a polymer material to produce a modified coal.

According to an aspect of the present invention, there is provided a method for manufacturing modified coal using pulverized coal, comprising the steps of spraying and coagulating molten polymer in pulverized coal, cooling the coagulated pulverized coal to produce raw coal, Pressing and heating to remove moisture and volatile materials and to paste; and molding and cooling the paste-like raw coal to form pellets, wherein during the step of preparing the raw coal, further oil is added to melt the polymer .

Before the coagulating step, the step of pulverizing the polymer, and the step of melting the pulverized polymer.

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The pasting step is characterized by reacting the raw material with a pressure of 5 to 10 bar and a temperature of 300 to 450 ° C to melt the polymer material contained in the raw material and to evaporate moisture and volatile substances contained in the raw material .

Wherein the weight ratio of the pulverized coal: molten polymer mixed in the step of producing the raw coal is 1: 0.05-0.3.

The pulverized coal may include at least one of lignite and anthracite coal, and the polymer material may include at least one of HDPE, LDPE, PP, PET, PS, and a biopolymer.

The method for producing modified coal using pulverized coal according to the present invention has the following effects.

First, it is possible to make modified coal by using non-ferrous metal, which can reduce the cost.

Second, it is possible to improve the convenience of transportation by processing pulverized coal, which is difficult to transport and store, into a particulate form.

Third, the modified coal can be produced at a lower temperature than the coal liquefaction process, thereby reducing the processing cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a process for producing a modified coal by mixing a pyrochlore and a polymer material,
Figure 2 illustrates a process according to one embodiment of the present invention,
FIG. 3 is a view showing a process of flocculating fine particles of non-ferrous metal according to an embodiment of the present invention,
FIG. 4 is a view showing a process for producing modified coal by mixing coagulated vascularized gold according to an embodiment of the present invention with a polymer material, pressurizing and heating it,
5 is a graph showing changes in fluidity when the modified coal (example) and lignite (comparative example) were mixed with coke at 5%
FIG. 6 is a photograph showing a state of a modified coal produced by mixing a non-veined carbon and a polymer material.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, a method for manufacturing modified coal using pulverized coal according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention relates to a method for producing modified coal by mixing pulverized coal and a polymer under a lower temperature and pressure than a conventional coal liquefaction process.

As shown in FIG. 2, the present invention comprises the steps of spraying and coagulating molten polymer in pulverized coal (S10), cooling coagulated pulverized coal to produce raw coal (S20), pressurizing and heating the raw coal, And removing and volatilizing the volatile material (S30); and molding and cooling the paste-like raw material to form pellets (S40).

Here, it may further include a step of pulverizing the polymer to be carried out before the flocculating step (S10), and a step of melting the pulverized polymer.

As shown in FIGS. 2 to 4, the pulverized coal used here is made of a non-ferrous metal (C2) such as lignite and anthracite, and HDPE, LDPE, PP, PET, PS and biopolymer All kinds of polymers can be used.

Compared with the conventional coal fine powder of bituminous coal, the finely pulverized coal of the non-ferrous metal has a disadvantage in that it is inferior in the tackiness characteristic instead of being cheap. In order to increase the sticking property, the polymer material is melted and the pulverized coal is dispersed in the molten polymer material to obtain a modified coal having a certain degree of dispersion and density.

Polymer materials may be used in general products, but waste plastics, waste tires, etc., which are discarded, may also be used. These wastes cause environmental pollution when they are buried. However, when used in the present invention, it is possible to expect both effects of improving the quality of low grade non-ferrous bronze and reducing environmental pollution at the same time.

In general, waste plastics are very diverse in size and do not easily melt when their size is large. Therefore, it is preferable that the polymer material is first pulverized before melting. To this end, the polymer material P is charged into the second crusher 12 and crushed. The polymer material P is introduced into the polymer hopper 22, and the polymer powder P is discharged to the mixer 30 by a predetermined amount. Mix. The mixture of the pulverized pulverized coal and the polymer material is pressurized and heated in the reactor 40 to melt the polymer material, and pulverized coal is dispersed in the polymer melt to produce a uniform quality modified coal (C) paste. When the paste is formed into a pellet while cooling it, the modified coal (C) is completed.

Since the polymer material is generally melted at 350 DEG C or higher, the polymer material is introduced into the polymer melter 60 at the step of melting the polymer, and then heated to 350 DEG C or higher to prepare the molten polymer. At this time, the melting point of the polymer material may be lowered by injecting oil into the polymer melt 60 at the oil adder 31.

The coagulating step (S10) is performed by charging the non-ferrous metal (C2) in the finely divided state into the coagulant (70) and then spraying the molten polymer material. Pulverized coal is a nonpolar material that is not well soluble in water as a polar material, but is easily dispersed in the same nonpolar material. Therefore, when the molten polymer material is injected into the pulverized coal, the pulverized coal is uniformly distributed within the polymer material, and the pulverized coal is agglomerated by the adhesive force of the polymer material. At this time, the agitator 70 may assist the agglomeration more smoothly in the agitator 70.

The agglomerated pulverized coal (C3) forms a mass of bullion 10 to 100 times larger than the conventional pulverized coal, and the scattered characteristic is weakened, which facilitates transportation. However, in this case, the pulverized coal and the polymer material are physically mixed and adhered and not chemically modified.

The coarse pulverized coal (C3) is cooled and used in the subsequent process. At this time, air cooling and oil cooling are more suitable than water cooling. If cooled in a water-cooled manner, the raw coal will contain moisture and may consume more calories to remove it.

The melting point of the polymer material can be lowered by additionally supplying oil from the oil adder 31 in the course of mixing the pulverized coal C3 and the polymer material P in the mixer 30 described above. This is because the oil to be added in the melting step is lost during coagulation, cooling and transportation. At this time, the oil supplied from the oil adder 31 can use the oil generated in the coke making process, the industrial waste oil, or the lubricant, so that the waste oil generated in the other process can be recycled.

In order to paste the mixture of the pulverized coal (C3) and the polymer material (P), the polymer material is melted and the water and volatile substances are evaporated by a reaction at a pressure of 5 to 10 bar and a temperature of 300 to 450 ° C. In this case, the weight ratio of the pulverized coal: molten polymer is preferably 1: 0.05 to 0.3.

Conventionally, in the process of liquefying coal, coal is liquefied at a pressure of 120 to 170 bar and a temperature of 400 to 460 ° C. However, in the present invention, the reaction occurs at a relatively low pressure because the polymer is melted rather than liquefied, and the modified coal is dispersed in the polymer melt to produce modified coal.

When the pulverized coal is dispersed in the molten polymer, the oxygen contained in the pulverized coal is discharged, and the hydrogen contained in the polymer is transferred to the pulverized coal to increase the quality.

The weight ratio of the pulverized coal and the polymer may be adjusted in the above-described coagulation step or may be adjusted by additionally mixing the polymer material in the mixer 30.

During the coagulating step (S10), it is preferable to inject a minimum amount of the molten polymer for coagulating the fine powder, rather than precisely controlling the weight ratio of the pulverized coal and the polymer. If too much polymer is added in the coagulation step, the density of the pulverized coal particles captured in the polymer is lowered, and the volume and density of the pulverized coal may be lowered in the subsequent production of the reformed coal.

FIG. 5 is a graph showing fluidity data of a coke (example) in which 5% of modified coal produced according to the present invention is mixed with a coke (a comparative example) in which 5% of common lignite fine powder is mixed.

As shown in FIG. 5, it can be seen that the coke obtained by mixing the modified coal according to the present invention has excellent fluidity as compared with the coke mixed with common lignite.

FIG. 6 is a photograph showing the state of the modified coal produced by mixing the particulate non-ferrous metal and the polymer material. Since the modified coal has a larger particle size than the fine powder and has relatively high strength and cohesion, it can solve the problem that the pulverized coal is scattered during transportation and pollutes the atmosphere.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

11: first crusher 12: second crusher
21: Vale gold molten hopper 22: Polymer hopper
30: Mixer 31: Oil additive
40: Reaction part 50: Injection part
60: polymer melter 70: agglomerator
80: cooler P: polymer material
C1: Beige gold bullion (bullion) C2: Beige gold bullion (differential)
C3: Beige gold (coagulated)
C: Modified coal

Claims

Spraying and pulverizing the molten polymer in the pulverized coal;
Cooling the agglomerated pulverized coal to produce raw coal;
Pressurizing and heating the raw coal to remove water and volatile materials and paste them; And
And molding and cooling the paste raw raw material into a pellet shape,
Characterized in that during the step of producing the raw coal, the addition of oil further lowers the melting point of the polymer.

The method according to claim 1,
Characterized by further comprising the step of pulverizing the polymer and the step of melting the pulverized polymer before the coagulating step.

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The method according to claim 1,
The paste is reacted at a pressure of 5 to 10 bar and a temperature of 300 to 450 ° C to melt the polymer material contained in the raw carbon and to evaporate moisture and volatile substances contained in the raw carbon , A method for producing modified coal using pulverized coal.

The method according to claim 1,
Wherein the weight ratio of the pulverized coal to the molten polymer is 1: 0.05 to 0.3 during the step of producing the raw coal.

The method according to claim 1,
Wherein the pulverized coal comprises at least one of lignite and anthracite coal,
Wherein the polymer material comprises at least one of HDPE, LDPE, PP, PET, PS and a biopolymer.