KR101941335B1 - Combustion promoting composition for coal and method for prepairing the same - Google Patents

Abstract

The present invention relates to an aqueous solution comprising 65 to 87% by weight of oxygen water; 10 to 20% by weight of sodium borate hydrate; 5 to 10% by weight of sodium hydroxide; 1 to 5% by weight hydrogen peroxide; 1 to 5% by weight of manganese; And 1 to 5% by weight of a corrosion inhibitor. When the combustion promoting composition according to the present invention is applied to a combustion process of coal, sulfur oxides (SO _x ) and it is possible to minimize the generation of nitrogen oxides (NO _x) to greatly improve the problem of air pollution and improves the corrosion resistance of the equipment, such as boilers can extend the life of the equipment and significantly reduce facility management costs.

Description

TECHNICAL FIELD [0001] The present invention relates to a combustion promoting composition for coal,

The present invention relates to a combustion promoting composition for coal and a method for producing the same, and more particularly, to a method for suppressing the generation of sulfur oxides (SO _x ) and nitrogen oxides (NO _x ) Which can reduce atmospheric pollutants and maximize combustion efficiency, and a method for manufacturing the same.

Exhaust gas generated when burning various liquid fuels or solid fuels in a boiler or incinerating waste etc. contains harmful substances such as sulfur oxides and carbon monoxide. The sulfur oxides contained in the exhaust gas not only cause serious air pollution but also require a separate dust collecting device for treating a large amount of sludge produced in the process of corroding facilities such as boilers and treating sulfur oxides, Which increases the installation and management cost of the system. The coal, which is a solid fuel, has a disadvantage in that it is less combustible than heavy fuel, which is a liquid fuel, and a large amount of ash after the combustion accumulates in the boiler. However, since it has abundant reserves all over the world, it can provide stable supply and economical advantage.

Conventional methods used to remove sulfur oxides is how to handle by spraying calcium hydroxide (Ca (OH) ₂₎ in the exhaust gas generated when various fuel incineration, is reacted with calcium hydroxide, the sulfur oxides to gypsum (CaSO ₄₎ a _{(Ca (OH) 2 + SO} 3 = CaSO 4 + H 2 O). However, this method has a problem that since sulfur oxide is not completely treated and a large amount of sludge is produced in the process of treating sulfur oxide, an apparatus for treating such sludge is separately required.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to effectively remove sulfur oxides (SO _x ) and nitrogen oxides (NO _x ) to minimize air pollution which was an unavoidable problem in coal burning, Thereby reducing the management cost of the facility. In addition, the present invention aims at enhancing combustion efficiency by promoting combustion by improving combustion rate and combustion time of coal.

One aspect of the present invention is a composition comprising: 65 to 87% by weight of oxygen; 10 to 20% by weight of sodium borate hydrate; 5 to 10% by weight of sodium hydroxide; 1 to 5% by weight hydrogen peroxide; 1 to 5% by weight of manganese; And 1 to 5% by weight of a corrosion inhibitor.

[구조식 1] The dissolved oxygen amount (DO) of the oxygen water may be 40 ppm to 150 ppm.
The sodium perborate hydrate is _{Na 2 [B 4 O 5 (} 0H) 4] 8 H 2 O , and to be ionized according to chemical equation 1, the anion is _{B 4 O 5 (OH) 4} 2- is displaying a structural formula 1 .
[Chemical reaction formula 1]

[Structural formula 1]

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The corrosion inhibitor may be selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, N, N-dimethylethanolamine, 2- (methylamino) ethanol (2- methylamino ethanol, 2-amino-2-methyl-1-propanol, 1-amino-2-propanol, 2- (2-aminoethoxy) -ethanol, and 3- (diethylamino) -1,2-propanediol. And at least one amine-based compound selected from the group consisting of

Another aspect of the present invention is directed to a method of making a fuel cell, And dissolving sodium borate hydrate, sodium hydroxide, hydrogen peroxide, manganese, and a corrosion inhibitor in the produced oxygen water.

The oxygen number is 65 to 87 wt%; The sodium borate hydrate is 10 to 20% by weight; The sodium hydroxide comprises 5 to 10% by weight; 1 to 5% by weight of hydrogen peroxide; The manganese is 1 to 5% by weight; And 1 to 5% by weight of the corrosion inhibitor.

Wherein the oxygen water is a water tank in which water is stored; An ice-cooling condenser connected to the water tank for first cooling the water flowing out of the water tank; A first connecting conduit connected to said ice cooling chiller; An oxygen generator connected to the first connecting conduit and supplying oxygen to the water primarily cooled by the ice-shaft chiller; An oxygen dissolver connected to the first connection conduit and activating dissolution of oxygen to produce oxygen water; A second connecting conduit connecting the oxygen dissolver and the ice-shaft chiller to each other and allowing the oxygen water passing through the oxygen dissolver to be secondarily cooled by the ice-shaft chiller; And an outlet pipe connected to the ice-shaft chiller and discharging high-concentration oxygen water that has been secondarily cooled by the ice-shaft chiller.

When the combustion promoting composition according to the present invention is applied to the combustion process of coal, the generation of sulfur oxides (SO _x ) and nitrogen oxides (NO _x ) generated in the combustion process of coal can be minimized, And the corrosion resistance of the boiler and other equipment is improved, so that the entire service life of the equipment can be extended and the facility management cost can be remarkably reduced.

In addition, since the combustion promoting composition according to the present invention can greatly increase the combustion efficiency and can be applied through a method of injecting into coal, it is found that the economical efficiency is very excellent have.

The combustion promoting composition according to the present invention can be efficiently used not only in a boiler but also in incineration of waste.

1 is a conceptual diagram schematically showing an oxygen-water producing apparatus according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, it should be understood that the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

The combustion promoting composition for coal according to one aspect of the present invention comprises oxygen water (A), sodium borate hydrate (B), sodium hydroxide (C), hydrogen peroxide (D), manganese (E), and corrosion inhibitor do.

The oxygen water (A) serves to promote the combustion of coal by mixing oxygen with coal to supply oxygen.

The oxygen water may be a highly concentrated oxygen water having a dissolved oxygen amount (DO) of 40 ppm to 150 ppm, specifically 80 ppm to 150 ppm, more specifically 100 ppm to 150 ppm. Such highly concentrated oxygen water can be produced by an oxygen water producing apparatus to be described later.

The oxygen water may be contained in an amount of 65 to 87% by weight based on the total weight of the combustion promoting composition for coal. When the oxygen amount is less than 65 wt%, the oxygen supply amount is insufficient and the improvement of the combustion efficiency is insignificant. When the oxygen amount is more than 87 wt%, the composition does not balance with other components of the composition and the effect of desulfurization and the like may be lowered.

Sodium borate hydrate (B) can maximize combustion efficiency by increasing the combustion temperature to minimize unburned materials and by supplying oxygen as well as oxygen water. In addition, sulfur can be removed through alkaline ion (Na ⁺ ) generated by ionization.

The sodium borate hydrate may be Na ₂ [B ₄ O ₅ (OH) ₄ ] ₈ H ₂ O, which is referred to as borax or borax.

Na ₂ [B ₄ O ₅ (OH) ₄ ] ₈ H ₂ O is ionized according to the following chemical formula 1, and B ₄ O ₅ (OH) ₄ ^{2-, which} is an anion, can be represented by the following structural formula 1.

[Chemical reaction formula 1]

[Structural formula 1]

Sulfur dioxide (SO ₂ ) generated when coal is burned is combined with water vapor (H ₂ O) to become sulfuric acid (H ₂ SO ₄ ), and sulfuric acid can be desulfurized by reacting with 2Na ⁺ .

The sodium borate hydrate may be contained in an amount of 10 to 20% by weight based on the total weight of the combustion promoting composition for coal. It is possible to exhibit an excellent combustion promoting effect and a desulfurizing effect in the above range.

Sodium hydroxide (C) is a strong base and acts as a combustion promoter. The sodium hydroxide may be included in an amount of 5 to 10% by weight based on the total weight of the combustion promoting composition for coal. If the amount is less than 5% by weight, the combustion promoting effect is insignificant. If the amount is more than 10% by weight, the melting point of coal may be lowered and the amount of generated clinker may increase.

Hydrogen peroxide (D) can increase combustion temperature, minimize unburned matter, and supply oxygen to promote combustion.

The hydrogen peroxide may be contained in an amount of 1 to 5% by weight based on the total weight of the coal combustion promoting composition. It is possible to exhibit an excellent combustion promoting effect in the above range.

The manganese (E) may be a powdery phase having a particle size of 200 to 280 mesh and serves as a catalyst for promoting combustion, removing nitrogen oxides, and desulfurizing effect.

The manganese may be contained in an amount of 1 to 5 wt% based on the total weight of the coal combustion promoting composition. It is possible to exhibit excellent combustion promoting effect and nitrogen oxide removal effect in the above range.

The corrosion inhibitor (F) functions to prevent the generation of corrosion products by preventing the formation of compounds based on oxides or oxides on the metal surface. The vapor corrosion inhibitor is composed of a compound having sublimation property or vaporization property at room temperature and at the same time having a corrosion inhibiting property or a mixture containing the compound as a main component.

Examples of the corrosion inhibitor include ethylene glycol, diethylene glycol, glycerol, diethylene glycol dimethyl ether, monoethanolamine, diethanolamine, Triethanolamine, N, N-dimethylethanolamine, 1- (2-hydroxyethyl) -2-pyrrolidinone, , 2- (methylamino) ethanol, 2-amino-2-methyl-1-propanol Amino-2-propanol, 2- (2-aminoethoxy) -ethanol, 2-amino- (2-hydroxyethyl) succinimide) and 3 (3-hydroxyethyl) succinimide. - (diethylamino) -1,2-propanediol (3- (diethylamino) -1,2-propanediol) etc. It can be exemplified.

In particular, amine-based corrosion inhibitors such as triethanolamine stabilize hydrogen peroxide, thereby delaying the decomposition of hydrogen peroxide even when heated up to about 180 ° C, and releasing a large amount of generator oxygen when the temperature exceeds about 180 ° C, Simultaneously, the coal can be burned even if the amount of oxygen introduced into the combustion chamber by the generated oxygen is small. When burning, for example, at about 800 ° C or more, corrosion with ethanolamine and borax can be suppressed.

The corrosion inhibitor may be included in an amount of 1 to 5% by weight based on the total weight of the coal combustion promoting composition.

A method of manufacturing a combustion promoting composition for coal according to an embodiment of the present invention includes the steps of: (S1) preparing oxygen water; And dissolving sodium hydroxide hydrate, sodium hydroxide, hydrogen peroxide, manganese, and a corrosion inhibitor in the produced oxygen water (S2).

In the step (S1) of producing oxygenated water, the oxygenated water includes a water tank in which water is stored; An ice-cooling condenser connected to the water tank for first cooling the water flowing out of the water tank; A first connecting conduit connected to said ice cooling chiller; An oxygen generator connected to the first connecting conduit and supplying oxygen to the water primarily cooled by the ice-shaft chiller; An oxygen dissolver connected to the first connection conduit and activating dissolution of oxygen to produce oxygen water; A second connecting conduit connecting the oxygen dissolver and the ice-shaft chiller to each other and allowing the oxygen water passing through the oxygen dissolver to be secondarily cooled by the ice-shaft chiller; And an outlet pipe connected to the ice-shaft chiller and discharging high-concentration oxygenated water that is secondarily cooled by the ice-shaft chiller.

1 is a conceptual diagram schematically showing an oxygen-water producing apparatus according to one embodiment of the present invention.

Referring to FIG. 1, the oxygen-water producing device 1 according to the present invention is capable of rapidly dissolving oxygen in water at a high concentration through a simple structure and a circulating system, and further increasing the solubility of oxygen. An ice-cooling water cooler 20 connected to the water tank 10 for first cooling the water flowing out of the water tank 10 and a first connection conduit 30 connected to the ice- An oxygen generator 40 connected to the first connecting conduit 30 and supplying oxygen to the water primarily cooled by the ice chiller 20 and an oxygen generator 40 connected to the first connecting conduit 30, An oxygen dissolver 52 for producing oxygen water by activating the oxygen dissolver 52 and an oxygen dissolver 52 and an oxygen dissolver 52 connected to the oxygen dissolver 52 and the ice- A second connection conduit (60) for allowing the second cooling (60) to be secondarily cooled, and a second connection conduit And a water outlet pipe (70) for discharging the cooled concentrated oxygen water.

Here, the water tank 10 is a container in which water to be produced by oxygen water is stored, and is connected to a water supply source (not shown) by a water supply pipe 11 to receive water to be produced as oxygen water from a water supply source. The water supply pipe (11) is provided with an activated carbon filter (12) for primarily purifying the water flowing into the water tank (10). In the activated carbon filter (12), activated carbon is contained in a chamber formed inside the housing. The activated carbon is a kind of char, such that the inside of the activated carbon is porous such as micropores, and contaminants are adsorbed thereby purifying the introduced raw water and significantly improving the dissolved oxygen amount of the produced oxygen water.

The water tank 10 is connected to the ice-shaft cooler 20. The ice-cooler cooler 20 firstly cools the water flowing out of the water tank 10 before oxygen mixing, and at the same time, A cooler housing 21 connected to the water tank 10 and filled with a heating medium 21a having a high thermal conductivity such as water or a coolant and a cooler housing 21 And an evaporator 22 connected to the evaporator 22 and including a compressor (not shown), and a refrigerating cycle of a kind, together with the evaporator 22, which is installed in the evaporator 21a and cools the heat medium by absorbing heat from the heat medium 21a A first cooling coil pipe 24 which is housed in the cooler housing 21 and has both ends connected to the water tank 10 and a first connecting conduit 30 to be described later, Lt; RTI ID = 0.0 > (21) < / RTI & And a second cooling coil pipe (25) connected to the water discharge pipe (70).

Further, on the cooler housing 21, there is provided an agitator 26 for stirring and circulating the heating medium 21a, and the cooling unit 23 further includes a temperature sensor 23a for measuring the temperature in the cooler housing 21, It is preferable that the internal temperature of the cooler 20 is always kept at a constant temperature such as 5 ° C, for example.

Since the first cooling coil tube 24 and the second cooling coil tube 25 are formed of a coil-shaped tube, the area of the first cooling coil tube 24 and the second cooling coil tube 25 in contact with the heating medium 21a is greatly increased, .

The first connecting conduit 30 is connected to the first cooling coil pipe 24 and the oxygen dissolver 52 of the ice-shaft chiller 20, A valve 32 is provided on the first connecting conduit 30 to control the flow of water to the oxygen dissolver 52 and an outlet pump 31 for generating a circulating force of water.

An oxygen generator 40 is connected to the first connecting conduit 30 by a T-connection tube or the like for example. The oxygen generator 40 is connected to the first cooling coil tube 24 of the ice- And an electrolytic oxygen generator for generating oxygen by electrolyzing water by supplying oxygen to the primary cooled water while flowing through the pipe.

The oxygen generator 40 is connected to the first connection conduit 30 by the third connection conduit 41 and to the water tub 10 by the fourth connection conduit 42, And generates oxygen by electrolysis or the like to supply oxygen to the first cooled water while flowing through the first cooling coil pipe (24) of the ice tube cooler (20) through the third connection conduit (41).

The third connecting conduit 41 is provided with an ozone removing filter 43 which can be formed, for example, by a carbon filter and a solenoid valve 44 for regulating the supply of oxygen. The fourth connecting conduit 42 is, for example, A cation removal filter (45) is provided to increase the life of the plated film of the decomposition type oxygen generator.

The first connecting conduit 30 is connected to an oxygen dissolver 52 which activates the dissolution of oxygen supplied by the oxygen generator 40 to produce oxygen water, A hollow fiber membrane filter connected to the first connection conduit 30 for activating oxygen dissolution and a solution stabilization tank connected to the hollow fiber membrane filter and connected to the second connection conduit 60 to be described later and for stabilizing the oxygen dissolution . The reason why the hollow fiber membrane filter is applied to the oxygen dissolver 52 is that the contact area between water and oxygen is increased exponentially as the fine pores of the hollow fiber filter are made into fine particles of oxygen and water, It is intended to greatly increase.

The oxygen dissolver 52 described above is connected to the ice-shaft cooler 20 by a second connection conduit 60 which passes through the oxygen dissolver 52 prior to the outflow of oxygenated water It is possible to allow one oxygenated water to be secondly cooled while being perfused through the second cooling coil pipe 25 of the ice-shaft chiller 20, and the second connecting conduit 60 is provided with a pressure- And a solution stabilization coil tube 61 for stabilizing dissolved oxygen in the oxygen water.

A water outlet pipe 70 is connected to the second cooling coil pipe 25 of the above-mentioned ice cooling water cooler 20. The water outlet pipe 70 is adapted to drink the high-concentration oxygen water which is secondarily cooled by the ice- The outlet pipe 70 is provided with an outlet solenoid valve 71 for controlling the flow of high-concentration oxygenated water.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to embodiments of the present invention. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples. The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example 1 and Comparative Example 1

Example 1

70% by weight of highly concentrated oxygenated water (dissolved oxygen amount (DO): 105 ppm), 15% by weight of sodium tetraborate decahydrate prepared by sodium bicarbonate hydrate Na ₂ B ₄ O ₇ 10H ₂ O, , 5% by weight of sodium hydroxide, 3% by weight of hydrogen peroxide, 3% by weight of manganese and 4% by weight of tetraethanolamine (TEA). 50 g of the prepared combustion promoting composition was sprayed to 4 kg of coal by a spray method. (SO ₂ ), nitrogen dioxide (NO ₂ ), carbon monoxide (CO), and carbon dioxide (CO ₂ ) generated by the combustion temperature and the combustion caused by the combustion were ignited in the combustion furnace. CO ₂ ) was measured and reported in Table 1 below. The emission of combustion gas was measured at 25 minutes after the ignition, in which the combustion was smooth after the initial ignition.

Comparative Example 1

(SO ₂ ), nitrogen dioxide (NO ₂ ), carbon monoxide (CO), and carbon dioxide (CO ₂ ) emissions caused by combustion temperature and combustion were measured by igniting 4 kg of coal which did not spray the combustion promoting composition Are shown in Table 1 below. The emission of combustion gas was measured at 25 minutes after the ignition, in which the combustion was smooth after the initial ignition.

[Table 1]

As shown in Table 1, in Example 1 using the combustion promoting composition of the present invention, it can be seen that the content of sulfur dioxide and nitrogen dioxide is decreased compared to Comparative Example 1 in which the combustion promoting composition of the present invention is not used. It can be seen that the incompletely burned carbon monoxide is remarkably reduced because of high efficiency.

Claims (7)

70% by weight of oxygen; 15% by weight of sodium borate hydrate; 5% by weight of sodium hydroxide; 3% by weight hydrogen peroxide; 3% by weight of manganese; And 4% by weight of a corrosion inhibitor,
The dissolved oxygen amount (DO) of the oxygen water is 40 ppm to 150 ppm,
The sodium perborate hydrate is _{Na 2 [B 4 O 5 (} 0H) 4] 8 H 2 O , and to be ionized according to chemical equation 1, the anion is _{B 4 O 5 (OH) 4} 2- is displaying a structural formula 1 By weight based on the total weight of the coal.
[Chemical reaction formula 1]

[Structural formula 1]

delete delete The method according to claim 1,
The corrosion inhibitor may be selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, N, N-dimethylethanolamine, 2- (methylamino) ethanol (2- methylamino ethanol, 2-amino-2-methyl-1-propanol, 1-amino-2-propanol, 2- (2-aminoethoxy) -ethanol, and 3- (diethylamino) -1,2-propanediol. A combustion promoting composition for coal comprising at least one amine compound selected from the group
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