WO2018199447A1 - Briquette composition and briquette comprising same - Google Patents

Abstract

The present invention relates to a briquette composition containing: coal having a moisture content of 5-70% and a caloric value of 1,000-5,000kcal/kg; and cellulose ether, and to a briquette comprising the same. According to the present invention, a briquette having excellent hydrophobicity, caloric value, and compressive strength can be provided even though a coal raw material having a high moisture content and a low caloric value within the range limits is used.

Description

Coal briquette composition and coal briquettes comprising the same

The present invention relates to a coal briquette composition and coal briquettes including the same, and more particularly, hydrophobicity, calorific value and compressive strength by containing cellulose ether together with coal having a moisture content of 5 to 70% and a calorific value of 1,000 to 5,000 kcal / kg. The present invention relates to a coal briquette composition capable of producing excellent coal briquettes and a coal briquette including the same.

Coal is generally divided into peat, brown coal, lignite, sub-bituminous coal, bituminous coal and anthracite grades. , Heavy or high voluminous bituminous coal, and anthracite is divided into semi-anthracite, anthracite, meta-anthracite and graphite anthracite. Among them, low rank coal (LRC) refers to brown coal, lignite and sub-bituminous coal, and bituminous coal and anthracite coal are classified as high rank coal (HRC).

In order to directly burn the coal for thermal power generation, high-grade coal such as anthracite coal and bituminous coal should be used, but such high-grade coal is expensive and has a small reserve. Therefore, researches on applying low rank coal (LRC) to the thermal power generation industry have been conducted.

However, low-grade coal has a low calorific value, so many limitations are imposed on the use of thermal power generation. Therefore, a high-calorification technology is needed to enable low-grade coal to generate calorific value of bituminous coal. In addition, low-grade coal has a high moisture content, so the weight and volume is not easy to transport. In addition, since lower coal such as lignite has a lot of pores and contains a large amount of volatile matter, the possibility of spontaneous ignition due to the temperature rise due to the accumulation of heat of adsorption due to the adsorption and desorption of water and the presence of oxygen functional groups occupying a considerable amount of volatile matter, Use has been limited.

In order to solve such a problem, Patent Document 1 (Korean Patent Publication No. 10-1209465) has a high calorific value of palm residue oil coated on the surface of the coal to increase the average calorific value of the coal, the possibility of moisture adsorption on the coal. And a method of reforming low-grade coal to reduce the possibility of spontaneous combustion. Specifically, the method for reforming coal using palm residue oil according to Patent Document 1 includes the steps of (a) pulverizing coal; (b) homogeneously mixing Palm residue with the pulverized coal; (c) a drying-stabilizing step in which the palm residue oil mixed with coal is melted and coated on the surface of coal and at the same time moisture in the coal is dried; (d) cooling the coal that has undergone the drying-stabilizing step; And (e) shaping coal that has undergone the cooling step, the process being quite complicated.

In addition, Patent Document 1 describes that the water remaining in the coal and the palm residue oil in the step (e) serves as a binder of the molding, the coal briquettes thus produced has a problem that the compressive strength is significantly reduced. Therefore, when the coal briquettes manufactured according to Patent Document 1 are stacked in containers having a specific shape such as storage tanks and melting furnaces, the coal briquettes are likely to be broken by their own load or to be broken during transportation, which may cause dust generation. have.

Therefore, as a method for improving the strength of coal briquettes, Patent Document 2 (Korean Patent Publication No. 10-1634069) proposed a method of manufacturing coal briquettes by mixing coal pulverized coal and a binder and then forming the coal briquettes. . At this time, patent document 2 used molasses and caramel suitably as said binder.

However, molasses has various problems such as supply and demand, quality instability and odor due to crops. In addition, the coal briquettes produced according to Patent Document 2 had a low hydrophobicity and a high water content when contacted with moisture.

That is, there is a problem in that the coal method having a low calorific value, for example, a calorific value of 5,000 kcal / kg or less, is used as a raw material to provide coal briquettes having excellent hydrophobicity and exothermicity but excellent compressive strength.

Coal coal having a low calorific value of 5,000 kcal / kg or less is used as a raw material, but has excellent hydrophobicity, and shows a high calorific value of 6,000 kcal / kg or more even after contact with moisture, and at the same time, coal briquettes capable of manufacturing coal briquettes having excellent compressive strength are produced. There is a need for research on providing a composition.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) KR101209465 B

(Patent Document 2) KR101634069 B

The present invention is to provide a coal briquette composition which can provide coal briquettes having excellent hydrophobicity, calorific value and compressive strength by including cellulose ether with coal having a moisture content of 5 to 70% and a calorific value of 1,000 to 5,000 kcal / kg.

In addition, the present invention is to provide a coal briquettes comprising the coal briquette composition.

In order to solve the above problems, the present invention is a coal 5 ~ 70% moisture content of 1,000 ~ 5,000kcal / kg calorie; It provides a coal briquette composition comprising a; and cellulose ether.

The calorific value of the coal briquettes prepared from the coal briquette composition may be 1.2 to 9 times that of the coal, and the moisture resorption rate calculated according to the following equation of the coal briquettes prepared from the coal briquette composition may be greater than 0% and 5% or less.

% Moisture resorption rate = A ₂ -A ₁

In the above formula, A ₁ (%) represents the moisture content (%) of coal briquettes immediately after preparation, and A ₂ (%) represents the moisture content (%) of coal briquettes taken out after immersion in water for 24 hours. The value was measured at 150 ° C. for 20 minutes using an infrared moisture meter (KETT, FD-720).

The coal may be pulverized coal having a particle size of more than 0 mm and 4 mm or less.

The viscosity of the cellulose ether (Brookfield Viscometer) may be 100 ~ 100,000cps when measured at 20 ℃ and 20rpm conditions using a Brookfield (LV) viscometer based on an aqueous solution of 2.0% by weight concentration.

The cellulose ether is selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose, hydroxyalkyl alkyl cellulose and alkyl alkyl hydroxylalkyl cellulose. It may include more than one kind, for example methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxyethyl methyl cellulose (hydroxyethyl methyl cellulose; HEMC), hydroxypropyl methyl cellulose (HPMC), ethyl hydroxyethyl cellulose (EHEC) and methylethyl hydroxyethyl cellulose (MEHEC). It may include.

The content of the cellulose ether may be 0.1 to 10.0 parts by weight based on 100 parts by weight of the coal.

The coal briquette composition according to the present invention may further include water.

On the other hand, the present invention provides a coal briquette comprising the coal briquette composition, the coal briquettes may have a water content of 0 to 20%, a calorific value of 6,000 ~ 9,000 kcal / kg.

The coal briquette composition according to the present invention uses coal having a high moisture content of up to 70% and a low calorific value of 5,000 kcal / kg or less as a raw material, and includes cellulose ether as a binder to prepare coal briquettes having excellent hydrophobicity, calorific value and compressive strength. can do.

Specifically, the coal briquettes provided according to the present invention may be excellent in hydrophobicity, and thus the possibility of re-adsorption and spontaneous ignition in transport and storage processes may be suppressed. In addition, the coal briquettes provided according to the present invention exhibit a high calorific value and thus may be preferably used for thermal power generation, and have excellent compressive strength, thereby not causing problems of breakage and dust generation.

Particularly, according to the present invention, it is possible to provide coal briquettes having a high calorific value of 6,000 kcal / kg or more, which is high-grade coal, by using low-cost, low-grade raw coal showing high moisture and low calorific value, thereby securing price competitiveness.

Figure 1 shows a photograph after immersing the coal briquettes prepared according to Examples 1 to 3 in a beaker filled with water for 1 hour.

Figure 2 shows a photograph of the coal briquettes prepared according to Comparative Examples 1 to 4 after being immersed in a beaker filled with water for 1 hour.

The present invention is a coal of 5 to 70% water content and 1,000 to 5,000 kcal / kg calorific value; It relates to a coal briquette composition comprising a cellulose ether; and a coal briquette comprising the same.

In the case of coal having a moisture content of 5 to 70% and a calorific value of 1,000 to 5,000 kcal / kg, which is used as a main raw material of the coal briquette composition according to the present invention, it shows a high calorific value of 6,000 kcal / kg or more to be used as coal briquettes for thermal power generation. High calorific value is essential and high quality such as prevention of moisture resorption, spontaneous ignition and dust generation is required. As a result of intensive studies according to these needs, the present inventors can provide coal briquettes having excellent hydrophobicity and compressive strength while showing high calorific value using coal in the above conditions without using a separate coal raw material drying process by using cellulose ether as a binder. It was confirmed that the present invention was completed.

As described above, the coal used in the present invention has a water content of 5 to 70% and a calorific value of 1,000 to 5,000 kcal / kg.

When the moisture content of the coal exceeds 70%, the excessive process of forming the raw coal for the production of coal briquettes for thermal power generation is difficult, and additional coal drying process is required, thereby increasing the manufacturing cost. On the other hand, when the coal briquettes are manufactured without additional drying using coal having a moisture content of more than 70%, the calorific value of the coal briquettes finally obtained is not low and cannot be used for thermal power generation. There is a high possibility of spontaneous combustion, and there is a problem that the compressive strength is also low. On the other hand, when coal with less than 5% of water content is used as raw coal, it is possible to manufacture coal briquettes having high calorific value due to the excellent calorific value of coal itself, but the cost of coal itself is very high and the calorific value of coal briquettes is improved. Because it is insignificant, economy is inferior.

When the calorific value of coal is less than 1,000 kcal / kg, even if cellulose ether is used as a binder, coal briquettes less than 6,000 kcal / kg, which is required for coal briquettes for thermal power generation, are manufactured and thus cannot be applied to an industrial field. On the other hand, in the case of coal whose calorific value exceeds 5,000 kcal / kg, the cost is low and economic efficiency is low.

The calorific value of the coal briquettes prepared from the coal briquette composition may be 1.2 to 9 times that of the coal. As described above, in the case of the coal briquettes provided according to the present invention, the coal briquettes having high calorific value at the level of high-grade coal can be manufactured using low-cost low-grade raw coal having a low calorific value, and thus, it is preferable to secure price competitiveness. .

In addition, the moisture resorption rate calculated according to the following formula of the coal briquettes prepared from the coal briquette composition may be greater than 0% to 5% or less.

% Moisture resorption rate = A ₂ -A ₁

In the above formula, A ₁ (%) represents the moisture content (%) of coal briquettes immediately after preparation, and A ₂ (%) represents the moisture content (%) of coal briquettes taken out after immersion in water for 24 hours. The value was measured at 150 ° C. for 20 minutes using an infrared moisture meter (KETT, FD-720).

The moisture resorption rate (%) is a value calculated by subtracting the water content (A ₁ ) of the coal briquettes immediately after manufacture from the water content (A ₂ ) of the coal briquettes taken out after immersing in water for 24 hours. It is a value that evaluates the moisture resorption rate of coal briquettes by creating an environment in contact with moisture. That is, the coal briquettes prepared according to the present invention have excellent hydrophobicity and may exhibit low water resorption rate of 5% or less even under excessive moisture contact environments such as being exposed to or exposed to heavy rains. Decreased calorific value of coal briquettes due to increased moisture content does not cause a problem.

In addition, in order to reduce the variation of coal briquette quality, it is preferable to use coal having a small particle size and constant. For example, pulverized coal of 0 mm or more and 4 mm or less may be preferably used as the coal.

The cellulose ether serves as a binder for bonding the coal particles to each other. The cellulose ether is derived from cellulose which is a vegetable material, and is a kind of cellulose derivative obtained by etherifying a hydroxyl group of cellulose with an etherifying agent. The cellulose ether can obtain an excellent binding effect even in a smaller amount than molasses. In addition, compared to molasses, supply and price fluctuation rate is stable and storage and maintenance costs are low. In addition, when the cellulose ether is used as a binder, there is an advantage in that coal briquettes having excellent strength can be obtained without using a strength enhancer.

Specifically, the cellulose ether is in the group consisting of alkyl cellulose, hydroxyalkyl cellulose, hydroxyalkyl alkyl cellulose and alkyl alkyl hydroxylalkyl cellulose. It may include one or more selected, for example methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxyethyl methyl cellulose (hydroxyethyl methyl cellulose HEMC), hydroxypropyl methyl cellulose (HPMC), at least one selected from the group consisting of ethyl hydroxyethyl cellulose (EHEC) and methylethyl hydroxyethyl cellulose (MEHEC) This can be used.

Preferably, any one selected from HEMC and HPMC or a mixture thereof may be used as the cellulose ether. More preferably, the HEMC may have a methyl group substitution rate (DS) of 18 to 32 wt% and a hydroxyethyl group substitution rate (MS) of 2 to 14 wt%, and the HPMC may have a methyl group substitution rate (DS) of 18 to 32 wt% and hydroxy. Propyl group substitution rate (MS) may be 2 to 14wt%. At this time, the higher the methyl group substitution rate, and the smaller the hydroxypropyl group or hydroxyethyl group substitution rate, the higher the hydrophobicity. When the coal briquette composition according to the present invention uses a cellulose ether having the methyl group, hydroxyethyl group or hydroxypropyl group substitution rate in the above range as a binder, a hydrophobic gel structure is formed and the adhesion between coal particles is enhanced to form a film. It is preferable because it can form and finally obtain coal briquettes having excellent hydrophobicity.

Here, the term "substitution rate" refers to the ratio of the sum of the atomic weights of the elements constituting each substituent (R) of the sum of the atomic weights of the elements constituting the repeating unit of the substituted cellulose as shown in the following formula (1).

Formula 1

Wherein R is independently of each other -H, CH ₃ , -CH ₂ CH ₂ OH or -CH ₂ CHOHCH ₃ , and n is an integer of 1 or more.

The viscosity of the cellulose ether (Brookfield Viscometer) may be 100 ~ 100,000cps when measured at 20 ℃ and 20rpm conditions using a Brookfield (LV) viscometer based on an aqueous solution of 2.0% by weight concentration. When the viscosity is included within the above range, the cellulose ether is preferred because it can impart a sufficient bonding force between the coal particles particles, it can further exhibit excellent process efficiency. Particularly, when the viscosity of the cellulose ether is 5,000 to 70,000 cps, the coal briquettes having excellent hydrophobicity, compressive strength and calorific value can be provided, and more preferably, the viscosity of the cellulose ether may be 10,000 to 60,000 cps.

The content of the cellulose ether may be 0.1 to 10.0 parts by weight based on 100 parts by weight of the coal. When the content of the cellulose ether is included in the above range, it is possible to high-calorie coal having a low calorific value of the lower coal level to a higher coal level by a simple method.

The cellulose ether may express adhesion through dissolution. Specifically, the cellulose ether is dissolved in a polar solvent represented by water. Cellulose ether, a polymer having a long chain form, is dissolved in water, a polar solvent, to form hydrogen bonds, and viscosity is expressed through a process of unfolding the polymer chains. In addition, after the process of evaporation of water to develop the adhesive force.

Accordingly, the coal briquette composition according to the present invention may further include water, and distilled water may be preferably used as the water. The water may be included within 50.0 parts by weight based on 100 parts by weight of the coal. When the content of the water is within the above range, it is easy to handle and can obtain a coal briquette composition having a uniform composition.

In addition, the coal briquettes composition according to the present invention may further include an additional binder at 10,000 parts by weight or less based on 100 parts by weight of cellulose ether.

The additional binder may be molasses, starch, gelatinized starch, modified starch, polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyacrylamide (PAM), sucrose, liquid glucose, acacia gum, tragacanth gum ), Gelatin, alginic acid, polymethylmethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyvinylmethylether (PLM), alginic acid, asphalt, bitumen, casein, epoxy resin, PITCH, polyamide, polyurethane, polyvinyl acetal, and the like may be used alone or in combination of two or more thereof.

On the other hand, the present invention provides a coal briquettes comprising the coal briquette composition. The coal briquettes may have a water content of 0 to 20% and a calorific value of 6,000 to 9,000 kcal / kg.

As such, the coal briquettes provided according to the present invention have not only a low water content thereof but also a very high hydrophobicity, so that the moisture resorption rate does not exceed 5%. That is, according to the present invention, even when exposed to moisture in the transport and storage process, the water content is hardly increased, thereby providing coal briquettes having a high calorific value.

In addition, the calorific value of the coal briquettes is high enough to be used for thermal power generation at the same level as the calorific value generated by high-grade coal such as bituminous coal and anthracite coal.

In addition, since the coal briquettes provided according to the present invention have excellent compressive strength, the coal briquettes are hardly damaged by their own load in the process of being stacked or transported inside a container having a specific shape such as a storage tank and a melting furnace. Therefore, dust generation due to coal briquettes is suppressed, and as a result, environmental pollution due to dust generation can be prevented.

Such a method for producing coal briquettes according to the present invention comprises the steps of: (1) preparing a mixture containing coal, cellulose ether and water having a moisture content of 5 to 70% and a calorific value of 1,000 to 5,000 kcal / kg; And (2) forming the mixture to produce coal briquettes.

As an example of step (1), after the cellulose ether is added to the coal to prepare a dry mixture, the wet mixture may be prepared by adding water to the dry mixture.

As another example of the step (1), the cellulose ether solution may be added to the coal to prepare a wet mixture. In this case, the cellulose ether solution may be a solution containing a cellulose ether and a solvent, the solvent may be water.

The coal may be used without limitation as long as it has a water content and a calorific value in the above range, and for example, lower coal of lignite or sub-bituminous coal may be preferably used. In the case of such lower coal, a complicated process is required for high calorific value in the related art, but according to the present invention, high strength coal briquettes having a high calorific value can be provided by a simple mixing and molding process.

The coal may be pulverized coal having a particle size of more than 0 mm and 4 mm or less, in which case, the bulk coal may be pulverized according to a known conventional method or purchased by pulverizing pulverized coal.

In addition, the method of manufacturing coal briquettes according to the present invention may further include heat treating the coal briquettes prepared according to step (2). Strength of the coal briquettes may be further increased through the heat treatment process, and the heat treatment may be performed for 1 to 5 hours at a temperature of 50 to 200 ° C.

When the temperature and time of the heat treatment is included in the above range, the effect of increasing the compressive strength of the coal briquettes may be increased, and crack generation and volatile loss may be reduced, which is preferable.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1

(Production of Grenade Composition)

100 parts by weight of low coal (lignite from Indonesia, particle size: 0.1 to 4 mm) having a moisture content of 15% and a calorific value of 4,120 kcal / kg and 1.0 part by weight of cellulose ether as a binder are mixed, and the mixture thus obtained is hand mixed for 1 minute ( hand mixing). In this case, as the cellulose ether, hydroxyethyl methyl cellulose (HEMC) having a viscosity of 10,000 cps was used. However, the viscosity of the cellulose ether is a value measured at 20 ° C. and 20 rpm using a Brookfield (LV) viscometer based on an aqueous solution of 2.0 wt% concentration.

Subsequently, 20 parts by weight of distilled water was added to the mixture passed through the hand mixing process, and then mixed with a Hobart mixer (Hungjin Precision, HJ-1150) for 3 minutes to prepare a coal briquette composition.

(Manufacture of coal briquettes)

The coal briquette composition was manufactured using a briquetting machine (Jilsan Co., Ltd., JCB250T) to produce coal briquettes having an elliptical shape of 51 mm × 38.2 mm × 24 mm thick.

Examples 2-7 and Comparative Examples 1-5

Coal briquettes were manufactured in the same manner as in Example 1, except that the water content and calorific value of the lower coal, the type and content of the binder were adjusted as described in Table 1 below.

	Low Coal		Binder (parts by weight)
	Moisture content (%)	Calorific Value (kcal / kg)	molasses	PVA	Starch	Cellulose ether
Example 1	15	4,120	-	-	-	1.0 (HEMC 1) 2% Wet Viscosity 10,000 cps
Example 2	15	4,120	-	-	-	1.0% (HEMC 2) 2% Wet Viscosity 60,000cps)
Example 3	15	4,120	-	-	-	1.0% (HPMC 2% Wet Viscosity 10,000cps)
Example 4	5	4,120	-	-	-	1.0 (HEMC 1) 2% Wet Viscosity 10,000 cps
Example 5	30	4,120	-	-	-	1.0 (HEMC 1) 2% Wet Viscosity 10,000 cps
Example 6	50	4,120	-	-	-	1.0 (HEMC 1) 2% Wet Viscosity 10,000 cps
Example 7	70	4,120	-	-	-	1.0 (HEMC 1) 2% Wet Viscosity 10,000 cps
Comparative Example 1	15	4,120	-	-	-	-
Comparative Example 2	15	4,120	8.0	-	-	-
Comparative Example 3	15	4,120	-	1.0	-	-
Comparative Example 4	15	4,120	-	-	1.0	-
Comparative Example 5	80	4,120	-	-	-	1.0 (HEMC 1) 2% Wet Viscosity 10,000 cps

* Low coal: lignite from Indonesia, particle size 0.1 ~ 4mm

* HEMC ¹⁾ : Lotte Fine Chemical Co., Ltd., MECELLOSE ^® CF-1, Viscosity: 10,000cps

* HEMC ²⁾ : Lotte Fine Chemical Co., Ltd., MECELLOSE ^® EMA-70U, Viscosity: 60,000cps

* HPMC: Lotte Fine Chemical Co., Ltd., MECELLOSE ^® PMC-60U, Viscosity: 10,000cps

* Molasses: Casey Industrial Environment Co., Ltd. (solid content: 77.2%, total equivalent weight: 49.3%)

* PVA: Kuraray, M17A

* Starch: Ingriddian Korea, AA alpha starch

<Evaluation Method>

1. Hydrophobicity Assessment

Fill the beaker with 100 g of water, deposit the coal briquettes prepared according to Examples 1 to 7 and Comparative Examples 1 to 5 for 1 hour, and then perform a sensory evaluation to visually observe the degree of collapse of the coal briquettes. The results are shown in Table 2 below. In Table 2 below, ① denotes a state in which the appearance of coal briquettes is not changed at all, ② denotes a state in which the surface of the coal briquettes is slightly excited, ③ denotes a state in which the surface of the coal briquettes is entirely excited, and ④ denotes a collapsed appearance of coal briquettes. (5) indicates the state where coal briquettes are completely collapsed. At this time, the less the change in appearance of the coal briquettes can be evaluated as a higher hydrophobicity.

1 and 2 respectively show photographs after the coal briquettes prepared according to Examples 1 to 3 and Comparative Examples 1 to 4 were deposited for 1 hour in a beaker filled with water.

Next, the water resorption rate of the coal briquettes prepared according to Examples 1 to 7 and Comparative Examples 1 to 5 was calculated according to the following formula, and the results are shown in Table 2 below.

% Moisture resorption rate = A ₂ -A ₁

In the above formula, A ₁ (%) represents the moisture content (%) of coal briquettes immediately after preparation, and A ₂ (%) represents the moisture content (%) of coal briquettes taken out after immersion in water for 24 hours. The value was measured at 150 ° C. for 20 minutes using an infrared moisture meter (KETT, FD-720).

2. Compressive strength (kg / cm ² )

The maximum fracture load per unit area of the coal briquettes prepared according to Examples 1 to 7 and Comparative Examples 1 to 5 was measured by using a universal testing machine (Xinjiang Precision Industries, AD-Universal Testing Machine-kN), and evaluated by compressive strength. The results are shown in Table 2 below. The compressive strength is a criterion for determining the rate at which the coal briquettes are damaged by their own load in the process of being stacked or transported in a container having a specific shape such as a storage tank and a melting furnace.

3. Calorific value (kcal / kg)

The calorific value of coal briquettes was evaluated by KTR (Korea Testing & Research Institute), an external certification body, and the results are shown in Table 2 below. At this time, the evaluation of the calorific value was performed immediately after the "1. hydrophobicity evaluation", that is, coal briquettes taken out after being deposited for 1 hour in a beaker filled with water.

	Exterior deformation (sensory evaluation)	Moisture content (%)		Water resorption rate (%)	Compressive strength (kgf / cm 2 )	Calorific Value (kcal / kg)
		Immediately after manufacture (A 1 )	After deposition (A 2 )
Example 1	① No change at all	14.81	17.80	2.99	45.7	6,560
Example 2	① No change at all	13.54	16.49	2.95	71.4	6,850
Example 3	① No change at all	14.90	17.73	2.83	50.3	6,593
Example 4	① No change at all	5.04	7.88	2.84	60.4	8,780
Example 5	① No change at all	17.78	21.10	3.32	44.5	6,320
Example 6	① No change at all	19.86	23.69	3.83	41.0	6,305
Example 7	① No change at all	19.98	23.24	3.26	40.8	6,280
Comparative Example 1	⑤complete collapse	14.25	30.01	15.76	0	3,214
Comparative Example 2	④ Appearance collapse	14.93	27.52	12.59	4.6	4,560
Comparative Example 3	⑤complete collapse	13.97	26.52	12.55	12.5	3,875
Comparative Example 4	⑤complete collapse	14.26	24.37	10.11	4.9	4,007
Comparative Example 5	③lifting the surface	21.69	28.79	7.1	3.4	3,207

Looking at the Table 1, the coal briquettes prepared according to Examples 1 to 7 of the present invention, it can be seen that the water resorption rate is lower than the coal briquettes prepared according to Comparative Examples 1 to 5, showing excellent hydrophobicity, It can be seen that the compressive strength and the calorific value are also markedly high.

In addition, looking at Figure 1 showing a picture after the coal briquettes prepared according to Examples 1 to 3 after immersing in a beaker filled with water for 1 hour, it can be more clearly confirmed that the appearance of the coal briquettes are not deformed at all. On the other hand, looking at Figure 2 showing a photograph after the coal briquettes prepared according to Comparative Examples 1 to 4 in a beaker filled with water for 1 hour, it can be confirmed that the appearance of the coal briquettes collapsed or the shape of the coal briquettes completely collapsed.

As described above, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain the present invention, and the scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto. Should be construed as being included in the scope of the present invention.

Claims (10)

1. Coal having a water content of 5 to 70% and a calorific value of 1,000 to 5,000 kcal / kg; And cellulose ether.
2. The method of claim 1,

   The calorific value of the coal briquettes prepared from the coal briquette composition is 1.2 to 9 times that of the coal, and the moisture resorption rate calculated according to the following equation of the coal briquettes prepared from the coal briquette composition is greater than 0% and 5% or less. :

   % Moisture resorption rate = A ₂ -A ₁

   In the above formula, A ₁ (%) represents the moisture content (%) of coal briquettes immediately after preparation, and A ₂ (%) represents the moisture content (%) of coal briquettes taken out after immersion in water for 24 hours. The value was measured at 150 ° C. for 20 minutes using an infrared moisture meter (KETT, FD-720).
3. The method of claim 1,

   The coal is coal briquette composition, characterized in that the pulverized coal having a particle size of more than 0mm and less than 4mm.
4. The method of claim 1,

   The viscosity of the cellulose ether (Brookfield Viscometer) is a coal briquette characterized in that 100 ~ 100,000cps when measured at 20 ℃ and 20rpm using a Brookfield (LV) viscometer based on an aqueous solution of 2.0% by weight Composition.
5. The method of claim 1,

   The cellulose ether is at least one selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose, hydroxyalkyl alkyl cellulose and alkyl alkyl hydroxylalkyl cellulose. Coal briquette composition comprising a.
6. The method of claim 1,

   The cellulose ether is methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxyethyl methyl cellulose (HEMC), hydroxy It is characterized in that it comprises at least one selected from the group consisting of hydroxypropyl methyl cellulose (HPMC), ethyl hydroxyethyl cellulose (EHEC) and methylethyl hydroxyethyl cellulose (MEHEC) Coal briquette composition to be.
7. The method of claim 1,

   Coal briquette composition, characterized in that the content of the cellulose ether is 0.1 to 10.0 parts by weight based on 100 parts by weight of the coal.
8. The method of claim 1,

   The coal briquette composition is a coal briquette composition, characterized in that it further comprises water.
9. Coal briquettes comprising the coal briquette composition according to any one of claims 1 to 8.
10. The method of claim 9,

    The coal briquettes are coal briquettes, characterized in that the water content is 0 ~ 20%, the calorific value is 6,000 ~ 9,000kcal / kg.

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