WO2015126169A2 - Combustion additive composition of solid fuel and method for using same - Google Patents

Abstract

The present invention relates to a combustion additive composition of a solid fuel, comprising 0.1-20 parts by weight of a copper precursor, and 10-300 parts by weight of a magnesium precursor with respect to 100 parts by weight of water. The composition according to the present invention has advantages in preventing slag and fouling generated during combustion of a solid fuel, such as coal, which can be used in a thermoelectric power plant, and also in increasing the combustion efficiency by delivering oxygen well even in an oxygen-poor condition.

Description

Combustion additive composition of solid fuel and method of using the same

The present invention relates to a combustion additive composition of a solid fuel and a method of using the same, and more particularly, to prevent slag and fouling generated during the combustion of a solid fuel such as coal that can be used in a thermal power plant. The present invention relates to a combustion additive composition of a solid fuel and a method of using the same, which are capable of delivering oxygen well even under combustion conditions in which oxygen is insufficient.

Various means to promote the combustion of solid fuels such as coal in thermal power plants and to improve the disadvantages of poor thermal efficiency due to the formation of slag and fouling, which is fixed by incomplete combustion or solids with low melting point in the combustion furnace or exhaust pipe Have been continuously studied to date.

More specifically, when solid fuel such as coal is combusted, the minerals in the coal are not combusted but are coaled, and some or all of them are discharged along the gas stream in a molten state in a region higher than the melting point, before the boiler tube is radiated. It can solidify and adhere to the hot surface to form slag. In addition, the alkali and volatile components in the ash are volatilized and condensed on the convective heat transfer surface such as superheater and reheater together with fly ash in the combustion gas to form fouling to corrode the heat transfer surface and to flow the combustion gas into the heat transfer surface. The worse the heat transfer, the lower the thermal efficiency, and in the worst case, the attached coal ash may fall and cause a tube rupture accident.

As a related art for such a combustion additive composition, Korean Patent Laid-Open Publication No. 10-2012-0049000 discloses a technique in which a complex metal chelate compound composed of a metal such as Mg, Ca, Mn, Zn, Al and an alkali metal is used as a combustion catalyst composition. It is also described in accordance with the Patent Publication No. 10-0761065 provides a fuel additive that buys hydrogen peroxide, silicate, borax, sodium hydroxide as a composition.

However, in the prior art including the prior literature as described above, there is no function to help the oxygen release in the region lacking oxygen, and also has the disadvantage of including alkali metal, when using hydrogen peroxide, it is easily decomposed at low temperature Therefore, it is expected to have difficulty in providing oxygen to a desired place in a high temperature boiler.

In general, alkali metals can increase the combustion efficiency because they assist in the activation of carbon, but in the case of containing alkali metals, they still remain in coal ash after combustion, which still leads to the possibility of causing slag or fouling problems. Done.

Coal ash is present in various types of coal, and it is known that SiO ₂ , Al ₂ O ₃ , Na ₂ O, Fe ₂ O ₃ , K ₂ O, CaO, MgO, TiO ₂ , and SO ₃ are present. Among these materials, materials that cause slagging and fouling are known as Fe ₂ O ₃ , KO, NaO, SO ₃ , and the like. Among them, components such as Na ₂ O, K ₂ O, CaO, MgO and the like are known to exist in a state in which silica and alumina are combined. In addition, SO _{3, which} is a sulfuric acid component among the acidic compounds present in coal ash, is highly reactive with basic compounds of coal ash. Therefore, the basicity is easily converted to a large Na ₂ O, K ₂ O, and the reactivity is strong, low melting _{Na 2 SO 4, K 2 SO} 4 is the primary cause of the slagging or fouling.

In addition, the higher the content of chlorine (Cl) component in coal, the more slagging and fouling may occur. The chlorine component can be converted into hydrochloric acid during coal combustion, which reacts with the iron component of the heat exchanger and the surface of the iron chloride Is switched to. On the other hand, the iron chloride is converted to iron oxide by the oxygen for combustion to form an iron oxide film.

At this time, the Na ₂ SO ₄ , K ₂ SO ₄ materials mentioned above reach the iron oxide film, and Na ₃ Fe (SO ₄ ) ₃ and K ₃ Fe (SO ₄ ) ₃ may be formed. Because of their low melting point, these materials exist as viscous liquids on the boiler tube surface, causing them to flow down to the bottom of the boiler where they cannot reach the heat, causing them to cool down and form a very large mass of bottom ash. Therefore, it is important to minimize the generation of Na ₂ SO ₄ , K ₂ SO ₄ which are sulfates of the alkali metal.

In addition, the alkali oxides present in the coal ash may exist mainly in feldspar form M ₂ Al ₂ Si ₆ O ₁₆ (M = Na, K). If they exist in pure form, fouling problems do not occur, but the more acidic SO ₃ is present, the more likely the alkali oxides are separated and converted to the sulfate form of alkali metal salts.

Therefore, in order to suppress the formation of the sulfate component of the alkali metal, there is a need for a combustion additive composition having excellent desulfurization performance.

On the other hand, in the combustion of solid fuel, such as coal, it is possible to distinguish between a region rich in oxygen and a region lacking locally in the solid fuel.

In this case, a catalyst system having a function of absorbing oxygen in an oxygen-rich region and releasing oxygen in an insufficient region is required. Combustion assisted catalyst systems of this concept include CuO—Fe ₂ O ₃ [Baowon Wang, et. al., Procedia Engineering 16 (2011) 48-53], NiO / Al ₂ O ₃ [Laihong Shen, et, al., Coumbustion and Flame 156 (2009) 1377-1385], and the like. Problems have been reported.

On the other hand, as described above, the alkali metal may increase the combustion efficiency because it helps the activation of carbon, but may remain in the coal ash after combustion, causing a problem of slag or fouling. For example, Na ₂ O, which does not adhere to inorganic matters, readily reacts with silica and converts into water glass with a lower melting point. In addition, low-melting compounds such as Na ₂ SO ₄ , which is a low-melting compound, are easily produced by reacting with sulfurous acid gas. Therefore, they have a possibility of becoming a major cause of slag and fouling.

In addition, K ₂ O, a coal ash produced by the combustion of inorganic components in coal, easily produces low melting point compounds such as K ₂ SO ₄ or K ₃ Fe (SO ₄ ) ₃ . The low melting point compound is a major factor material that causes slagging and fouling.

When the ash melting point is lowered due to the low melting point compound, the produced coal ash melts and attaches to the combustion furnace, and the combustion efficiency decreases, and if it is severe, it becomes a cranker to close the pipe around the combustion furnace and obstruct the combustion. It causes major problems in the operation of coal-fired furnaces, such as incurring higher management costs.

Therefore, it is possible to prevent slag and fouling by increasing the temperature of the ash melting point, and to select a metal catalyst that facilitates the absorption and release of oxygen, and has a function of easily releasing oxygen at a temperature below 1000 ° C., There is a continuing need for research on the preparation of combustion additive compositions of solid fuels having good desulfurization performance.

In order to solve the above problems, the present invention facilitates the absorption and release of oxygen and may have a function of releasing oxygen in the region lacking oxygen to prevent slag and fouling by increasing the temperature of the melting point and excellent desulfurization performance It is to provide a combustion additive composition of a solid fuel having a combustion method and a solid fuel using the same.

The present invention provides a combustion additive composition of a solid fuel comprising 0.1 to 20 parts by weight of copper precursor and 10 to 300 parts by weight of magnesium precursor, based on 100 parts by weight of water.

In one embodiment, the magnesium precursor may include magnesium hydroxide, the content of the magnesium hydroxide may include 10 to 100 parts by weight with respect to 100 parts by weight of water.

In one embodiment, the combustion additive composition may include particles having copper hydroxide coated on the surface of magnesium hydroxide.

As an example, the magnesium precursor may further include magnesium nitrate in addition to magnesium hydroxide, and the additionally included magnesium precursor may be 1 to 100 parts by weight of 100 parts by weight of water.

In one embodiment, the copper precursor may be any one selected from copper nitrate, copper sulfate, copper chloride or a mixture thereof.

In one embodiment, the combustion additive composition may be included in an amount of 0.5 parts by weight or less based on 100 parts by weight of water.

In one embodiment, the combustion additive composition may be added 0.0001 ~ 2 parts by weight to 100 parts by weight of the solid fuel.

The present invention also provides a solid fuel comprising 10 to 100 parts by weight of magnesium hydroxide powder having a specific surface area of 5 to 80 m ² / g, 0.1 to 20 parts by weight of copper precursor, and 10 to 100 parts by weight of magnesium nitrate, based on 100 parts by weight of water. To provide a combustion additive composition.

The present invention also adds 0.0001 to 2 parts by weight of the combustion additive composition described above to 100 parts by weight of the solid fuel, and then injects the solid fuel injected with the combustion additive composition after the injection into the solid fuel. To provide.

The combustion additive composition of the solid fuel obtained in the present invention can prevent slag and fouling that may be formed in a combustion furnace or a boiler or a pipe during the combustion of solid fuel such as coal, has excellent desulfurization performance, and also has oxygen In the region lacking, it may have a function of releasing oxygen, thereby increasing the combustion efficiency.

1 is a diagram showing the results of TGA analysis showing the effect of copper oxide in the present invention.

Figure 2a) is a SEM analysis of the dried composition obtained by the embodiment of the present invention, Figure 2b) is an EDX analysis of the composition.

Hereinafter, the configuration of the invention will be described in detail so that those skilled in the art to easily carry out the invention. In describing the principles of preferred embodiments of the present invention in detail, detailed descriptions of well-known functions or configurations will be omitted if they are determined to unnecessarily obscure the subject matter of the present invention.

The present invention provides a combustion additive composition of a solid fuel comprising 0.1 to 20 parts by weight of copper precursor and 10 to 300 parts by weight of magnesium precursor based on 100 parts by weight of water.

In the present invention, the copper precursor as the first component of the combustion additive composition of the solid fuel may form copper oxide by combining with oxygen contained in the air under oxidizing conditions including air at high temperature, which is the combustion condition of the solid fuel. If it is, the type is not limited.

Regarding the oxygen release effect of the copper component, a material which freely releases oxygen at 1000 ° C. or lower through TGA analysis by selecting CuO, Fe ₂ O ₃ , and V ₂ O ₅ , which are known as a conventional combustion catalyst, is a comparative material. CuO was found to be the most useful material. Therefore, it is easily understood that the material capable of easily releasing oxygen under combustion conditions is CuO.

Figure 1 shows the TGA analysis results.

In addition, CuO—Fe ₂ O ₃ , a material known as a combustion catalyst [Baowen Wang, et. al., Procedia Engineering 16], it was difficult to prove the effect of iron oxide as a result of observing the oxygen release by mixing the two materials. Therefore, it is easily understood that the material capable of easily releasing oxygen under reducing conditions is CuO.

The copper oxide component serves to supply oxygen to oxygen-deficient materials by releasing oxygen as the second copper oxide is converted to the first copper oxide in the reduction zone during coal combustion. In the presence of sulfuric acid gas, CuSO ₄ is first formed on the surface, which is easily decomposed at 560 ℃. The decomposition products are converted into copper oxide and SO _3, and SO ₃ is converted by reaction with added magnesium component of magnesium oxide (MgO) of the components of which will be described later with the use of magnesium sulfate (MgSO _4). In the case of such a reaction, reverse reaction does not proceed and magnesium oxide (MgO) is consumed. In addition, since copper oxide reacts with sulfurous acid gas and is easily converted to sulfuric acid gas, copper oxide has a desulfurization function in a combustion furnace, so it is suitable for use as a dry desulfurization agent.

In the present invention, the part which can substantially act as a catalyst for the solid fuel may be copper oxide, but the copper oxide (CuO) is less dispersible in the solid fuel because of its low solubility in water, so It is necessary to use a material having high solubility as a precursor.

The copper precursor may be a copper salt compound including copper, and preferably, any one or a mixture thereof may be selected from copper nitrate, copper sulfate, and copper chloride.

The copper precursor is sprayed with water on solid fuel such as coal, so that the solid fuel containing the copper precursor can be converted to copper oxide under combustion conditions, the copper oxide can facilitate the absorption and release of oxygen. Function.

For example, combustion at a temperature of about 1000 ° C. in a combustion power plant in a thermal power plant often lacks oxygen, and locally burned oxygen and rich regions coexist while burning solid fuel. In this case, incomplete combustion is performed in the region where oxygen is insufficient, so efficient oxygen supply is required. In the case of the combustion additive of the present invention, copper (II) becomes copper oxide (I) in the reduction region, and thus it is effective to burn oxygen. In addition, in the presence of sulfuric acid gas, CuSO ₄ is first formed on the surface, which is easily decomposed at 560 ° C.

Wherein the decomposition products are converted into copper oxide and SO _3, and SO ₃ will react with the MgO it is converted to MgSO _4. In the case of this reaction, the reverse reaction does not proceed and MgO is consumed. In addition, since copper oxide reacts with sulfurous acid gas and is easily converted to sulfuric acid gas, copper oxide has a desulfurization function in a combustion furnace, so it is suitable for use as a dry desulfurization agent.

In order to achieve this object, the composition ratio of the content of the copper precursor is preferably in the range of 0.1 to 20 parts by weight based on 100 parts by weight of water.

And 400 to 1200, according to Westmoreland and Harrion desulfurization experiments (Westmoreland, PR and Harrison, DP: "Evaluation of Candidate Solids for High-Temperature Desulfurization of Low-Btu Gases", Environmental Science & Technology, 10, 659 (1976)). Ten elements that are useful in the temperature range of ℃ have been published, including copper. For this reason, the copper precursor used in the present invention serves to release oxygen and also has desulfurization performance.

In the present invention, preferably, copper nitrate (Cu (NO ₃ ) ₂ ) may be preferably used among the copper precursors.

Meanwhile, when copper sulfate or copper chloride is used in addition to the copper nitrate, the copper sulfate may be reactive with alkali metals to cause slag and fouling, and copper chloride may include chlorine ion or chlorine gas after combustion. This is a problem that the surface may be converted to iron chloride by reacting with the iron component in the pipe, so that the iron oxide film may be formed by conversion to iron oxide by oxygen in the combustion air, but this may not be a problem depending on the combustion conditions of the combustion furnace. It may be.

The copper nitrate dissolves well in an aqueous solution, and when the aqueous solution is sprayed under a high temperature and oxygen atmosphere, nanoparticles are formed, and thus the CuO activity is greatly increased.

On the other hand, the copper nitrate content that can be used in the present invention is preferably in the range of 0.1 to 20 parts by weight based on the water used as the solvent.

As content of the said copper precursor, 0.1-20 weight part of copper precursors can be used with respect to 100 weight part of water, Preferably 0.2-15 weight part can be used. When the content of the copper precursor is lower than 0.1 parts by weight, the oxygen release effect due to the copper precursor is insignificant, and when the content of the copper precursor is higher than 20 parts by weight, the economical efficiency is lowered, the above range is preferable.

Copper oxide finally reacts with silica and is converted to copper silicate, resulting in higher crystallinity than viscous materials in coal ash. As a result, the viscosity of the particles is reduced, so that the aggregation of particles is reduced, so that a large amount of coal ash does not occur.

Magnesium precursor may be used as the second component of the combustion additive composition of the solid fuel of the present invention.

Alkaline metals may be added and used to remove sulfur compounds present in the coal ash more efficiently. Magnesium or calcium can be used for this purpose, but magnesium oxide as a magnesium component can be easily reacted with SO ₃ and converted to high melting point MgSO ₄ to control slagging or fouling.

In addition, when the magnesium oxide is used, the pre-generated Na ₂ SO ₄ may also be converted to MgSO ₄ , thus remaining at the level of surface corrosion and alleviating serious slagging problems.

On the other hand, the calcium component as another alkaline metal component may cause gypsum formation, which may cause another fouling problem, and thus the magnesium component is preferable.

The magnesium precursor is not limited as long as the magnesium precursor can form magnesium oxide by combining with oxygen contained in the air under oxidizing conditions including air at high temperature, which is a combustion condition of solid fuel.

The role of the magnesium precursor is used to effectively remove sulfur compounds such as sulfur nitrous oxide which may be generated after combustion of the solid fuel.

That is, it can be converted to the SO ₃ reacts with the magnesium components of magnesium sulfate (MgSO ₄₎ in the case where SO ₃ is produced by the combustion reaction, as previously described, when such a reaction without the reverse reaction not proceed magnesium oxide (MgO) is consumed.

The magnesium precursor is a magnesium compound containing magnesium, magnesium oxide, magnesium hydroxide, magnesium nitrate, magnesium sulfate, magnesium carbonate and the like can be used, in the present invention, any one or a mixture thereof can be used, preferably Preferably, magnesium hydroxide may be used as the magnesium precursor.

The magnesium precursor may exhibit some degree of desulfurization performance when used alone without using a copper precursor, but may not satisfy the effects of slagging and fouling, and reducing coal, carbon monoxide, sulfur dioxide, and sulfuric acid gas.

Meanwhile, in the present invention, the magnesium hydroxide may be used only with magnesium hydroxide or a copper precursor, or may be used by mixing any one compound of the magnesium hydroxide with magnesium oxide, magnesium hydroxide, magnesium nitrate, magnesium sulfate, and magnesium carbonate. .

The magnesium hydroxide used in this case can use what has a specific surface area in the range of 3-150m <^2> / g, Preferably it can use what exists in the range of 5-80m <^2> / g.

Magnesium hydroxide is inexpensive in terms of price, and it is easy to discharge by dissolving magnesium sulfate, a product obtained by desulfurization, in an aqueous solution phase, and the absorbent liquid has weak alkalinity, which is low in corrosiveness and thus damages the combustion furnace or boiler tube. It has the advantage of being reduced.

In addition, the magnesium component of the magnesium hydroxide component serves to increase the IDT (melting point) of the inorganic material, it can be used for combustion by combining in the form of a complex ion with the alkali metal in the ionic state.

On the other hand, in general, hydroxide-based compounds of metal components increase combustion efficiency by increasing carbon conversion efficiency as hydroxide is decomposed during combustion, and lowers its melting point when alumina oxide is contained in solid fuel during combustion. By removing the fusion or suppressing the formation can reduce the slag and fouling.

As the content of the magnesium precursor that can be used in the present invention may be used 10 to 200 parts by weight, preferably 15 to 150 parts by weight based on 100 parts by weight of water.

If the content of the magnesium hydroxide is too low, the lower the reactivity with sulfuric acid gas, the higher the advantage, but there may be a problem in unit cost and dispersion.

In the present invention, when magnesium hydroxide is mixed with magnesium precursor other than magnesium hydroxide as a magnesium precursor, any one of magnesium oxide, magnesium hydroxide, magnesium nitrate, magnesium sulfate, and magnesium carbonate may be used as a precursor other than magnesium hydroxide. This can be used.

When the magnesium hydroxide is mixed with a magnesium precursor other than magnesium hydroxide, the amount of each precursor used is 10 to 100 parts by weight of magnesium hydroxide and 10 to 200 parts by weight of magnesium precursor other than magnesium hydroxide, based on 100 parts by weight of water. Can be used.

In this case, preferably magnesium nitrate may be used as the magnesium precursor other than the magnesium hydroxide.

Meanwhile, the copper precursor or magnesium precursor used in the present invention may be used in the form of a hydrate or in the form of an anhydride. The content of the copper precursor or magnesium precursor used in this case is determined based on the anhydride except for the coordinated H ₂ O molecules.

When magnesium nitrate is additionally included in the combustion additive composition according to the present invention, the magnesium nitrate is decomposed at high temperature to convert MgO and NOx, and MgO is converted to MgSO ₄ , which is a high melting point, by reacting with SO _3, and NOx is reacted with CO Can be converted to nitrogen and carbon dioxide. At this time, since NO ₃ acts as an oxygen provider, it can give an excellent effect of suppressing the production of coal briquettes than using ordinary magnesium oxide.

If the magnesium nitrate is used in the above range, the effect is increased, but it is not preferable to use it alone for economic reasons.

On the other hand, the solid fuel in the present invention can be burned to further include 3 to 50 parts by weight of fatty acid ester and 5 to 30 parts by weight of liquid paraffin based on 100 parts by weight of the combustion additive composition.

Fatty acid ester and liquid paraffin added to the solid fuel lowers the ignition temperature of the fuel to help the initial ignition, and serves to improve the calorific value of the fuel, stabilize the reaction of the fuel and the combustion state in the combustion chamber.

Here, the fatty acid ester may be a methyl ester of vegetable oil selected from soybean oil, rapeseed oil, palm oil, sunflower oil or corn oil. In addition, the methyl ester of the vegetable oil may further include a pitch oil generated during the production of biodiesel oil using the vegetable oil. The content of the fatty acid ester and the liquid paraffin may have a range of 3 to 50 parts by weight of fatty acid ester and 5 to 30 parts by weight of liquid paraffin based on 100 parts by weight of the combustion additive composition, but is not limited thereto.

Preferably, based on 100 parts by weight of the combustion additive composition may include 5 to 30 parts by weight of fatty acid esters and 5 to 20 parts by weight of liquid paraffin.

The type of solid fuel used in the present invention is generally a solid fuel used in a thermal power plant, and is not limited to a specific type of solid fuel.

For example, as the type of solid fuel that can be used in the present invention, there are coal, coke, and the like, of which coal is most used. Coal is classified into carbonaceous anthracite, volatile bituminous coal and lignite, depending on the degree of carbonization. Bituminous coal is an effective fuel for power generation because its calorific value is lower than that of anthracite.

The components of these solid fuels mainly include carbon, hydrogen, oxygen, and other heteroatoms such as nitrogen and sulfur, and other inorganic substances.

The sulfur component is likely to be converted to sulfur dioxide or sulfuric acid gas after combustion, and thus an effective suppression thereof is required.

The precursor components of the combustion additive composition in the present invention may be used dissolved or dispersed in water.

On the other hand, as the content of the combustion additive composition in the present invention can be used during combustion, the combustion additive composition may be used 0.0001 ~ 2 parts by weight, more preferably 0.0005 ~ 1.5 parts by weight, 100 parts by weight of solid fuel Preferably 0.001 to 1.2 parts by weight can be used.

When the combustion additive composition is used less than 0.0001 parts by weight, the effect is negligible at the time of combustion and when used more than 2 parts by weight it is economically disadvantageous to have a content in the above range.

For example, the combustion additive composition of the present invention may be prepared by using the combustion additive composition of solid fuel using 10 to 100 parts by weight of magnesium hydroxide powder, 0.1 to 20 parts by weight of copper precursor, and 10 to 100 parts by weight of magnesium nitrate based on 100 parts by weight of water. I can make it. In this case, the specific surface area of the magnesium hydroxide may have a range of 5 to 80 m ² / g.

As an example, in order to introduce a copper oxide (CuO) component to the combustion additive composition of the present invention, when copper nitrate (Cu (NO ₃ ) ₂ ) is added to a slurry obtained by dispersing magnesium hydroxide in water as a precursor component, magnesium hydroxide Copper precursors are adsorbed to the particles.

That is, magnesium hydroxide particles (Mg (OH) ₂ ) are dissolved in water in a small amount of about 0.0014g / 100ml to release hydroxyl groups. At this time, the released hydroxyl groups cause exchange reaction with nitro anions of Cu (NO ₃ ) ₂ . . Cu (OH) ₂ is automatically coated on the surface of magnesium hydroxide to adsorb copper. Copper oxide made in this way has a great synergistic effect on the formation of copper oxide catalyst, desulfurization, and silica copper together with magnesium oxide.

At this time, by administering magnesium nitrate it can be prepared such a combustion additive composition. On the other hand, the slurry has a feature that easily sinks, if the material such as a cellulose-based viscosity modifier is applied to 0.5 parts by weight or less can be obtained dispersion stability.

On the other hand, the combustion additive composition in the present invention can be used as a dispersed form injected into a solid fuel.

That is, the combustion additive composition may be sprayed onto a solid fuel such as coal and uniformly dispersed in a large area, and then burned in a combustion chamber.

More specifically, after the combustion additive composition is prepared in the form of a slurry, it may be pre-injected into solid fuel such as coal used in a thermal power plant, and the dispersed solid fuel may be put into a combustion furnace and combusted. The pre-injected and dispersed combustion additive composition may uniformly disperse the surface of the solid fuel to give an effect of the present invention when the solid fuel is burned.

In addition, the combustion additive composition may be used by spraying in the combustion furnace in the process of the solid fuel is burned. In this case, since copper nitrate, which is a copper precursor in the combustion additive composition, has a property of becoming nanoparticles at a high temperature, it becomes a condition for supplying oxygen more effectively.

In addition, by discharging from the rear end of the combustion chamber, sulfur dioxide contained in the exhaust gas can be absorbed, and in case of being dispersed by contacting with solid fuel by spraying in the air instead of directly injecting the solid fuel, the contact surface is widened to increase the desulfurization performance. There is an advantage.

Hereinafter will be described a method for producing a combustion additive composition of a solid fuel according to an embodiment of the present invention.

<Example 1>

To 60 parts by weight of Mg (NO ₃ ) ₂ · 6H ₂ O (molecular weight 256.41) and 6 parts by weight of Cu (NO ₃ ) ₂ · 4H ₂ O were added to 100 parts by weight of 36% magnesium hydroxide slurry (average particle size 2.5 μm) for 24 hours. Stirring completed the composition. The composition is in the form of a slurry which will have a composition of about 20% content on a MgO basis. In addition, Cu (OH) ₂ It can be proved by the EDX measurement results of Figure 2 that the evenly dispersed in the Mg (OH) ₂ particles.

<Example 2>

312 g of the composition of Example 1 (Example 2-1), 1560 g in 1000 kg of Dawson having carbon 74.2%, oxygen 3.1%, nitrogen 1.8%, sulfur 0.5%, ash 15.9%, and calorific value 6106 kcal (Example 2-2) and 3120 g (Example 2-3) were added to the combustion furnace and IDT (mineral melting point of inorganic matter), CO content and SO ₂ were added to the combustion furnace and the result of not adding the produced combustion additive. The content is summarized in Table 1 below.

Table 1

division	IDT (melting point of minerals)	CO (ppm)	SO 2 (ppm)
Unadded fuel (1,000 kg of coal)	1200 ℃	102	110
Example 2-1 (1,000 kg of coal + 312 g of additive)	1320 ℃	65	109
Example 2-2 (1,000 kg of coal + 1560 g of additive)	1410 ℃	35	105
Example 2-3 (1,000 kg of coal + 3120 g of additive)	1420 ℃	29	100

Through the results of Table 1, it can be seen that as the IDT increases, the amount of clinker accumulated in the heat exchanger of the combustion furnace is significantly reduced, and the CO is also considerably reduced. In addition, the content of sulfurous acid gas decreases as the amount added increases.

As a result, it can be seen that the heat exchange performance is improved in the furnace, which can greatly help not only fuel saving effect but also environmental problems.

Claims (10)

1. Combustion additive composition of a solid fuel comprising 0.1 to 20 parts by weight of copper precursor and 10 to 300 parts by weight of magnesium precursor with respect to 100 parts by weight of water.
2. The method of claim 1,

   Combustion additive composition of a solid fuel, characterized in that the magnesium precursor comprises magnesium hydroxide.
3. The method of claim 2,

   The magnesium hydroxide is 10 to 100 parts by weight based on 100 parts by weight of water, the combustion additive composition of solid fuel.
4. The method of claim 1,

   The copper precursor is any one or a mixture thereof selected from copper nitrate, copper sulfate and copper chloride.
5. The method of claim 3,

   Combustion additive composition of a solid fuel, characterized in that the magnesium precursor further comprises magnesium nitrate.
6. The method of claim 5,

   The additionally included magnesium precursor comprises from 1 to 100 parts by weight of 100 parts by weight of water, the combustion additive composition of a solid fuel.
7. The method of claim 1,

   The combustion additive composition is a combustion additive composition of a solid fuel, characterized in that it comprises particles having copper hydroxide coated on the surface of magnesium hydroxide.
8. The method of claim 1,

   The combustion additive composition is a combustion additive composition of a solid fuel, characterized in that the viscosity modifier is contained in 0.5 parts by weight or less based on 100 parts by weight of water.
9. Combustion additive composition of solid fuel comprising 10 to 100 parts by weight of magnesium hydroxide powder having a specific surface area of 5 to 80 m ² / g, 0.1 to 20 parts by weight of copper precursor and 10 to 100 parts by weight of magnesium nitrate, based on 100 parts by weight of water. .
10. After the injection additive composition according to any one of claims 1 to 9 is added by injecting 0.0001 to 2 parts by weight to 100 parts by weight of the solid fuel, the combustion additive composition is characterized by burning the injected solid fuel. Method of combustion of solid fuels.

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