KR101528471B1 - Additive improving coal powder fluidity - Google Patents

Abstract

The present invention relates to a powder fluidity-improving additive for improving fluidity of coals, comprising a high absorbing resin with a water-repellent organic particle and accordingly enabling the high absorbing resin to firstly adsorb moisture quickly between powders, thereby minimizing the gap between water-repellent organic particles or ion exchanging particles of high absorbing resins which are swelled by moisture or cohesion and condensation between high absorbing resins and powders. Therefore, the powder fluidity-improving additive of the present invention increases powder fluidity and accordingly remarkably ameliorates a clogging phenomenon of a transferring pipe used in all industrial processes like thermoelectric power plants where powders are used as raw materials.

Description

[0001] Additive improving coal powder fluidity [0002] The present invention relates to an additive for improving the flowability of coal,

The present invention relates to an additive for improving fluidity of a powder which improves the fluidity of coal, and more particularly, to a method for preventing clogging of a conveying pipe and improving fluidity when transferring powdered coal used as a raw material for a power plant To an additive for improving fluidity of a powder.

All industrial fields that use powder as raw material, such as coal or raw materials of coal or plastic materials used in the production of bituminous coal or coke, which are raw materials in thermal power plants, are all supplied in powder form, It is one of the very important factors.

As is known, all of the powdered materials include water molecules. The molecular sieves have the property of adsorbing almost all the moisture from the periphery thereof, or from the air against them. However, at temperatures much higher than room temperature, they behave in the opposite manner and release moisture to the surrounding air.

Moisture remaining on the powder may cause deficiency and air bubbles which may impair the quality of the final product in the case of plastic materials and may cause congerence and adherence between particles including moisture in the case of bituminous coal or coking coal. ) Is strengthened, the coal particles are clogged with each other or adhered to the wall of the conveying device, thereby causing a problem of clogging of the coal pipe.

Particularly, in the case of thermal power plants, coal is finely pulverized using a differentiator and burned through a furnace. Usually, a pulverizer is used to crush coal, and a coal feeder is used to feed coal to the pulverizer. The problem is that in high humidity, such as during the rainy season, the pulverized coal absorbs moisture from the air and becomes a wet coal (bamboo charcoal), which is highly viscous and contains moisture, which causes plugging of the coal pipe. Particularly, when wet coal is introduced, coal and moisture of small particle diameter adhere to the inner shaft tube portion of the mercury vapor tube, and when the supply is continued, the efficiency of the power plant is lowered and stability may be lowered.

In the industrial field using powder-like materials, it is possible to use a moisture-removing plant or a hot-air drying device such as Korean Patent No. 10-2010-0097068 and Korean Patent No. 10-1114522 or the like, In this case, a hammer is installed in the charger to remove the wet charcoal that has been collected. However, these techniques have the disadvantage of adding additional equipment or processes to remove water, resulting in increased process costs. In addition, when hot air is applied to the powder, it may cause changes in the powder component due to heat, and it is difficult to apply these techniques in the case of a powder having a low melting point or sensitivity to high temperature.

Korean Patent Publication No. 10-2010-0097068 (February 24, 2010) Korean Registered Patent No. 10-1114522 (November 29, 2011)

The object of the present invention is to provide an additive for improving powder flow in which water-repellent organic particles are contained in a superabsorbent resin to improve the fluidity of coal which can quickly adsorb water in the molecule .

Another object of the present invention is to provide an additive capable of stably operating a thermal power plant or a coke making process even when added to powders such as coal and preventing clogging of the transfer pipe and improving fluidity.

The present invention relates to an additive for improving powder flow which improves the flowability of coal.

One aspect of the present invention relates to an additive for improving powder flow which improves the fluidity of coal (coal) comprising water-repellent organic particles in a superabsorbent resin.

Another aspect of the present invention relates to an additive for improving powder flow which improves the flowability of coal further comprising ion-exchangeable particles in the additive. The ion exchangeable particles may be any one or more selected from ion exchangeable organic particles and ion exchangeable inorganic particles.

Further, the ion exchangeable particles may be selected from vinyl silane compounds such as vinyl trichlorosilane, vinyltris (2-methoxyethoxy) silane, vinyltriethoxysilane, and vinyltrimethoxysilane; 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-glycidyloxypropyltrimethoxy Silane, 3-glycidyloxypropylmethyldiethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) Aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3- -Mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, polymethylsiloxane, polydimethylsiloxane, polymethylvinylsiloxane, polymethylphenylsiloxane, oxyethylene-modified siloxane, Polymethylhydrogensiloxane, selected from octamethylcyclotetrasiloxane May be any water-repellent coating to one or more coatings, it may be a mean particle diameter of 1 to 200 ㎛.

The powder flow improver for improving the flowability of coal according to the present invention may further comprise 50 to 95% by weight of a superabsorbent resin and 5 to 50% by weight of a water-repellent organic particle, wherein the water-repellent organic particles are ethylene- May be any one or two or more selected from a copolymer, polyethylene, polypropylene, polydimethylsiloxane, polystyrene, polymethyl methacrylate, polysulfone, polyethersulfone, polyetherimide, polyimide and polycarbonate. The average particle diameter of the water-repellent organic particles may be 0.1 to 100 탆.

The superabsorbent resin according to the present invention may have a water absorption rate of 0.1 to 10 ml / sec and an apparent density of 0.1 to 2.0 g / cc, and the cation exchange capacity of the ion exchangeable particles is 1 to 150 meq / .

The additive for improving the flowability of coal according to the present invention improves the fluidity of the coal, and the additive for improving the flowability of the coal according to the present invention is characterized in that the superabsorbent resin rapidly adsorbs water present between powders and additionally the superabsorbent organic particles or the superabsorbent Resin, or between the super absorbent resin and the powder. This characteristic improves the fluidity of the powder, and it can remarkably improve the clogging of the conveyance pipe in all industrial processes using powder as a raw material such as a thermal power plant using coal.

Fig. 1 shows the results of the coagulation test conducted in Examples 1 to 4 and Comparative Examples 1 to 6.

Hereinafter, additives for improving powder flowability according to the present invention will be described in more detail through specific examples or examples. It should be understood, however, that the invention is not limited thereto and that various changes and modifications may be made without departing from the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In addition, the following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the drawings presented below may be exaggerated in order to clarify the spirit of the present invention. Also, throughout the specification, like reference numerals designate like elements.

Also, the singular forms as used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The additive for improving powder flowability according to the present invention may comprise water repellent organic particles in a superabsorbent resin.

The term " coal " used in the present invention collectively refers to a black-brown flammable mineral which is altered by the action of heat and pressure after the sedimentation and burial of organisms in the geological period and is generally classified into peat coal, coal, anatracite) as well as coking coal (coal, coal, coal, coal, anatracite) as well as coal, coal, lignite, peat, alumina, lignite, brown coal, bituminous coal and anthracite. ), That is, the concept including the tin coal, the partial tin coal, the weak coking coal, and the partially weak flaw charcoal.

The superabsorbent polymer is a hydrophilic resin having a cross-linking structure that can absorb water several times to several times its own weight and does not release water even when pressure is applied. It may be in any form as long as it is crosslinked to introduce a hydrophilic moiety insoluble moiety. The superabsorbent resin is not limited to the present invention as long as it is a known one. Examples of the superabsorbent resin include starch derivatives such as starch, starch-polyacrylate polymers and the like, polyvinyl alcohol-sodium acrylate polymers, polyacrylic acid-starch graft polymers, polyacrylate polymers, A modified cellulose such as a polyacrylic acid-polyvinyl alcohol copolymer, an isobutylene-maleic acid copolymer, a polyethylene oxide polymer, a methyl cellulose, a hydroxyethyl cellulose, a sodium carboxymethyl cellulose polymer, a graft polymer of a polyacrylic acid and a natural polymer, Gelatin, polyglycol, polyacrylic acid, and the like can be used.

The superabsorbent resin according to the present invention may affect the water absorption rate and the apparent density depending on the particle size. Generally, when the property of the powder flowing along the inclined surface is referred to as fluidity, it can be said to be the most influential factor on the transportability of the powder. The resistance to the flow of the powder can be said to be caused by the direct or indirect contact of the powder particles by interfering with the free motion of the other particles, which is the biggest cause of adhesion or engagement according to the moisture.

Generally, when the powder is coarse, the granule is spherical, and the apparent density is large, the fluidity is great. On the contrary, fine powders generally have poor fluidity. Therefore, when handling ultra fine powder, they are used by granulation. However, if the size of the particles is too large, it is difficult to carry large amounts, and it is difficult to effectively penetrate the coal coke, and as a result, the efficiency of the thermal power generation is lowered.

The superabsorbent resin according to the present invention may be changed according to the particle size, but it is preferable that the water absorption rate is 0.1 to 10 ml / sec, preferably 1 to 4 ml / sec in a range that does not affect the transportability of coal good.

The superabsorbent resin preferably has an apparent density of 0.1 to 2.0 g / cc, preferably 0.6 to 0.8 g / cc, insofar as it does not affect the transportability of coal.

The water-repellent organic particles serve to help the superabsorbent resin absorb moisture more quickly by pushing moisture out of the void space between the powders. The water-repellent organic particles may be made of an organic polymer having hydrophobic or water repellent properties, or may be formed by coating a hydrophobic polymer with conventional fine particles.

Examples of the organic polymer include ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polydimethylsiloxane, polystyrene, polymethylmethacrylate, polysulfone, polyethersulfone, polyetherimide, polyimide and polycarbonate. But the present invention is not limited thereto, and any one or two or more of them may be used.

When a hydrophobic polymer is coated on ordinary fine particles, the fine particles may be organic, inorganic, or metal. The kind of the fine particles is not limited, but is preferably an inorganic substance such as silica or fumed silica, or a metal oxide such as aluminum oxide, zinc oxide, titanium oxide, and magnesium oxide.

The hydrophobic polymer for coating the surface of the fine particles may be any one selected from the group consisting of polydiorganosiloxanes, polyorganosiloxanes, polydiorganosilazanes, polyorganosilazanes and other siloxanes and silazane compounds or emulsion-type fluorinated water repellents in addition to the above organic polymers Or two or more, but the present invention is not limited thereto.

The water-repellent organic particles preferably have an average particle diameter of 0.1 to 100 占 퐉, preferably 10 to 50 占 퐉. If it is less than or more than the above range, the water repellency is hardly expressed due to the size of the particles themselves, and the absorption power of the superabsorbent resin is also affected.

The powder flowability improving additive according to the present invention may comprise 50 to 95% by weight of a superabsorbent resin and 5 to 50% by weight of a water repellent organic particle. If it is outside the above range, the fluidization speed of the powder may be lowered, and as a result, the degree of coagulation may be increased and the effect required by the present invention may not be exhibited.

The powder flowability improving additive according to the present invention may further comprise one or more ion exchangeable particles selected from ion exchangeable organic particles and ion exchangeable inorganic particles in addition to the super absorbent resin and the water repellent organic particles.

The ion exchangeable particles are not limited to any kind provided that they have exchangeable ions capable of attracting positively charged ions to the surface. The ion exchangeable particles exhibit high dispersibility and swelling degree upon hydration, which can greatly enhance adsorption and dehydration of the additive according to the present invention.

The ion exchangeable organic particles may have a gel or macroporous matrix. Suitable base monomers for ion exchangers also include polymerizable monomers that can be converted into ion exchange resins by suitable functionalization. Examples of suitable monomers may include (meth) acrylate, (meth) acrylonitrile and styrene derivatives. The comonomers used to prepare the base polymer also include, for example, polyvinyl compounds such as divinyl benzene, ethylene glycol dimethacrylate or methylene bisacrylamide. Condensation resins derived from ion exchangers such as phenol-formaldehyde resins having suitable functional groups are also suitable.

Ion exchangers which can be used are known. Further details of the various ion exchanger types and their preparation can be found, for example, in Ullmann's Encyclopedia of Industrial Chemistry (Release 2001, 6th Edition). Preferred macroporous resins can have various void volume. The degree of crosslinking of a suitable ion exchanger is preferably 20% or less and particularly preferably 12% or less.

The ion-exchangeable inorganic particles may be selected from silicates, bentonites, kaolinites, dicites, acidic clays, glauces, and mixtures of these with metal cations. The metal cation is preferably one or more selected from the group consisting of sodium, aluminum, magnesium, iron, zinc, chromium, titanium, palladium, germanium and gallium.

The ion exchangeable particles may have a particle size of usually 1 to 300 mu m, preferably 10 to 200 mu m, but are not limited thereto. The ion exchangeable particles are preferably contained in an amount of 5 to 30 parts by weight based on 100 parts by weight of the additive, but are not limited thereto.

The ion exchangeable particles may be used alone or may be coated with a water repellent agent. The water repellent may be selected from the group consisting of the hydrophobic organic polymer and a particulate coating agent such as ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polydimethylsiloxane, polystyrene, polymethyl methacrylate, polysulfone, polyethersulfone, polyetherimide, It is also possible to use any one or two or more selected from polyorganosiloxanes, polyorganosiloxanes, polydiorganosilazanes, siloxanes such as polyorganosilazanes, and silazane compounds or emulsion-type fluorinated water repellents in addition to polycarbonate .

Hereinafter, additives for improving the flowability of the powder according to the present invention will be described in more detail based on examples and comparative examples.

The physical properties of additives prepared by the following examples and comparative examples are as follows.

(Raw material)

The raw materials used in this Example are shown in Table 1 below.

[Table 1]

(Absorption rate)

10 ml of SAP was put in a 100 ml measuring cylinder, and 100 ml of distilled water was slowly added thereto. At this time, the time at which the swollen SAP reaches the scale of 100 ml was measured, and the arrival point is the time when the upper part of the distilled water disappears by the SAP. The absorption rate of SAP was measured as shown in Equation 1 below.

[Formula 1]

(In the above formula 1, t ₁ is the time point at which the scale reaches 100 ml of SAP.)

(Cohesiveness)

The sample was placed in a sieve having a diameter of 215 mm and a mesh size of 5.6 mm, and the sample was vibrated for 60 seconds, and then the amount remaining on the sieve was measured. The sieve shaker (CG-2118) 2.

[Formula 2]

(In the formula 2, A represents the weight of the sample before being applied to the body vibrator, and B represents the weight of the sample remaining on the body after the vibration).

(Fluidization rate)

The sample was placed in a plastic container having a volume of 200 ml and allowed to stand. The fluidization time of the coal was evaluated according to the water absorption of the sample and the separation of the coal particles.

○: Within 1 minute

Δ: 1 minute or more, 5 minutes or less

×: more than 5 minutes

(Examples 1 to 4 and Comparative Examples 1 to 6)

First, coal was separated into powder and particulate coal using a 5.6 ㎜ sieve, and the coal passed through the sieve was completely dried in a dryer at 110 ° C for 24 hours. Then, 10 g of distilled water was added to 50 g of dried coal to prepare a wet coal.

Separately, the additive compositions having the compositions shown in Table 2 were put in a mixer, respectively, and then added to the prepared wet charcoal in the amounts shown in Table 2 below. The degree of aggregation and the rate of fluidization were measured and are shown in Table 2 below.

[Table 2]

As shown in Table 2, the additives for improving the flowability of coal according to the present invention have a high fluidization speed and a low degree of cohesion in spite of a small amount of use. In particular, it was confirmed that Examples 3 and 4 using the additives of the compositions 3 and 4 had an excellent fluidization speed and a low cohesion of less than 5% as compared with the other examples and the comparative examples.

Claims (11)

Starch-starch, starch-polyacrylate polymer, polyvinyl alcohol-sodium acrylate polymer, polyacrylic acid-starch graft polymer, polyacrylate polymer, polyethylene oxide polymer, polyacrylic acid-polyvinyl alcohol copolymer, isobutylene- Methylcellulose, hydroxyethylcellulose, sodium carboxymethylcellulose polymer, graft polymer of polyacrylic acid and natural polymer, gelatin, polyglycol and polyacrylic acid; And
Wherein at least one selected from the group consisting of ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polydimethylsiloxane, polystyrene, polymethylmethacrylate, polysulfone, polyethersulfone, polyetherimide, polyimide and polycarbonate is added to the superabsorbent resin An additive for improving the flow of powders which improves the flowability of coal (coal) including water-repellent organic particles. The method according to claim 1,
Wherein the additive further comprises ion-exchangeable particles selected from at least one of ion-exchangeable organic particles and ion-exchangeable inorganic particles. delete 3. The method of claim 2, wherein the ion exchangeable particles are selected from the group consisting of vinyl trichlorosilane, vinyltris (2-methoxyethoxy) silane, vinyltriethoxysilane, vinyltrimethoxysilane, 3-methacryloxypropyltrimethoxy Silane, 3-methacryloxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyl (Aminoethyl) -3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltriethoxysilane, N-2- Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, - mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, polymethylsiloxane, polydimethylsiloxane Improved powder flow improves the flowability of coal which is water-repellent coated with a coating selected from one or more of polymethylvinylsiloxane, polymethylphenylsiloxane, oxyethylene-modified siloxane, polymethylhydrogensiloxane and octamethylcyclotetrasiloxane. Additive for. The method according to claim 1,
Wherein the additive comprises 50 to 95% by weight of a superabsorbent resin and 5 to 50% by weight of a water-repellent organic particle, wherein the additive is improved in flowability of coal. delete 3. The method of claim 2,
Wherein the ion exchangeable particles have an average particle diameter of 1 to 300 占 퐉. 3. The method of claim 2,
Wherein the ion exchangeable particles comprise 5 to 30 parts by weight per 100 parts by weight of the additive. The method according to claim 1,
Wherein the superabsorbent resin has improved fluidity of coal having a water absorption rate of 0.1 to 10 ml / sec and an apparent density of 0.1 to 2.0 g / cc. The method according to claim 1,
Wherein the water repellent organic particles have an average particle diameter of 0.1 to 100 占 퐉. 3. The method of claim 2,
Wherein the cation exchange capacity of the ion exchangeable particles is 1 to 150 meq / 100g.

Images