KR100908494B1 - Fuel additive composition - Google Patents

Abstract

The present invention relates to a fuel additive composition, and more particularly, to a fuel additive composition for coal composed of sodium silicate, alkali metal hydroxide, borax and polyhydric alcohol. In addition, the fuel additive composition is characterized in that it further comprises a fatty acid ester and liquid paraffin.

The fuel additive composition of the present invention induces complete combustion during combustion of coal, which is the fuel of a kiln and a boiler, suppresses clinker removal and generation, prevents corrosion in a furnace, and reduces harmful gas emission. It has the effect of saving fuel, extending boiler life and maintenance cost by increasing heat efficiency by improving heat generation.

Fuel Additive, Borax, Sodium Silicate, Clinker

Description

Composition of Fuel-additives

The present invention reduces harmful substances such as CO, NOx and SOx generated during coal combustion, removes and suppresses the clinker and impurities in the combustion engine generated due to incomplete combustion, and induces complete combustion to generate heat and heat efficiency. The present invention relates to a fuel additive composition for coal, which can be improved to extend the life of a furnace and save fuel and maintenance costs.

With the recent high oil price era, interest in alternative energy development and coal, which is a conventional fuel, is increasing, and energy saving due to rising fuel costs is emerging as a key task.

In the prior art Republic of Korea Patent No. 642164, a fuel additive which is effective in improving cold resistance, slag prevention and clinker removal by using ethylene glycol, oxidizing agent, stabilizer, etc. is known, and in Patent No. 492193, hydrogen peroxide and triethanolamine, zinc oxide , Fuel additives for removing scale and clinker, preventing generation and reducing air pollutants by using manganese dioxide and the like are disclosed. Thus, a composition for controlling a flame having an effect of preventing scale and removing chute, clinker and sludge in a combustion engine is known. However, the patent has been developed in combination with coal and bunker C oil is not designed to fit the characteristics of the coal, there is a problem that does not significantly affect the heating value improvement.

Therefore, there is an increasing demand for the invention of the fuel additive for coal, which can increase the calorific value and the thermal efficiency than the existing fuel additive inventions as described above.

Therefore, the present inventors have conducted research and efforts to solve the problems of the existing inventions and demands of the art, high impurities in the furnace, clinker removal rate and thermal efficiency, can save the life of the furnace and maintenance costs, environmental pollutants The inventors have invented a fuel additive composition capable of producing less.

The present invention relates to a fuel additive composition,

Sodium silicate 40 to 80% by weight, alkali metal hydroxide 15 to 50% by weight, borax 2 to 15% by weight and polyhydric alcohol 2 to 15% by weight is characterized in that it contains.

In addition, the present invention is characterized in that it further comprises 5 to 100 parts by weight of fatty acid ester and 5 to 50 parts by weight of liquid paraffin based on 100 parts by weight of the fuel additive composition.

As described above, the fuel additive composition for coal according to the present invention improves combustion efficiency and calorific value of coal fuel and saves fuel, and can save energy by increasing the pulverization efficiency of fuel in a furnace. Dust and carbon monoxide (CO) Reduces environmental pollutants such as sulfur oxides (SOx) and nitrogen oxides (NOx), prevents corrosion of the inner wall of the furnace and minimizes the removal and occurrence of clinkers, which can extend the life of the furnace and reduce maintenance costs. It works.

Conventionally, there are many fuel additives for fossil fuels, but these are fuel additives for solid or liquid fossil fuels. The present inventors have come to invent a fuel additive composition suitable for coal as a solid fossil fuel, the present invention will be described in detail below.

The present invention relates to a fuel additive composition comprising a composition ratio of sodium silicate, alkali metal hydroxide, borax and polyhydric alcohol.

The present invention also relates to a fuel additive composition further comprising a fatty acid ester and liquid paraffin in the fuel additive composition.

Referring to the fuel additive composition described above in more detail.

First, the fuel additive composition of the present invention

Sodium silicate 40 to 80% by weight, alkali metal hydroxide 15 to 50% by weight, borax 2 to 15% by weight and a polyhydric alcohol, characterized in that it comprises a mixture of 2 to 15% by weight.

In addition, the present invention

It is characterized by further comprising 5 to 100 parts by weight of fatty acid ester and 5 to 50 parts by weight of liquid paraffin based on 100 parts by weight of the mixture.

The composition components of the present invention described above will be described in detail below.

Sodium silicate as a composition component of the present invention has a moisture content of 35% or more, so it can dissolve the alkali compound and the alcohol-based organic compound, it is changed to the water glass component by the thermal decomposition serves to reduce and suppress the occurrence of clinker. The sodium silicate may be used 40 to 80% by weight, more preferably 50 to 70% by weight with respect to the total weight of the mixture, if less than 40% by weight has a slight problem with the removal of clinker, when more than 80% by weight in the sodium silicate The problem arises that combustion is disturbed by silicates and water components.

The alkali metal hydroxide as a composition component of the present invention generates oxygen at a high temperature to induce secondary combustion of the scale attached to the inner wall of the furnace, supplements insufficient oxygen in the furnace to induce complete combustion, and additionally generates alkali ions ( Na ⁺ , K ⁺ ) combines with harmful gases to reduce air pollutants and prevent corrosion in the furnace due to sulfuric acid. The alkali metal hydroxide may be used alone or in combination of one or more selected from sodium hydroxide and potassium hydroxide. Here, the alkali metal hydroxide may be used 15 to 50% by weight, more preferably 25 to 40% by weight based on the total weight of the mixture, if the alkali metal hydroxide is less than 15% by weight does not contribute to the promotion of combustion, If it exceeds 50% by weight, the melting point of the fuel is lowered, which leads to an increase in the occurrence of clinker.

The composition components of borax in the invention decomposes during combustion temperature rise is induced such that the release of oxygen, because organic material is completely burned to be incompletely burned, due to the SO ₂ generated in the furnace of sulfuric acid (H ₂ SO ₄₎ is generated no Corrosion inside, alkali ions (Na ⁺ ) generated from borax during combustion are combined with sulfuric acid (H ₂ SO ₄ ) to be replaced by Na ₂ SO ₄ , thereby preventing corrosion in the furnace due to sulfuric acid. In addition, borax decomposed at high temperature forms water glass on the inner wall of the furnace together with sodium silicate to suppress the formation of clinker, and to increase the thermal conductivity by preventing the corrosion by coating the inner wall of the furnace to further extend the life of the furnace, and separate cleaning work This reduces the need for SO ₂ and reduces NOx emissions during combustion. The borax may be used 2 to 15% by weight, more preferably 5 to 10% by weight based on the total weight of the mixture. Herein, when the borax is less than 2% by weight, the role of corrosion prevention is weak, and when it exceeds 15% by weight, the melting point of the fuel is lowered, which leads to an increase in the occurrence of clinker.

The polyhydric alcohol of the present invention may be used by mixing one or more selected from glycerol, ethylene glycol, and diethylene glycol. Glycerol (C ₃ H ₈ O ₃ ) enhances combustion effects and helps dissolve borax, and ethylene glycol helps to overcome seasonal limitations by improving sludge dispersion and fluidity and lowering freezing point. The polyhydric alcohol may be used 2 to 40% by weight, more preferably 10 to 30% by weight based on the total weight of the mixture, if the polyhydric alcohol is less than 2% by weight of the alkali metal hydroxide is difficult to dissolve This is because sediment occurs when it exceeds 40% by weight.

In addition, the present invention is characterized in that it further comprises 5 to 100 parts by weight of fatty acid ester and 5 to 50 parts by weight of liquid paraffin based on 100 parts by weight of the mixture.

Fatty acid ester and the liquid paraffin further included in the fuel additive of the present invention lowers the ignition temperature of the fuel to help the initial ignition, improve the grinding effect of the fuel, improve the calorific value, stabilize the reaction of the components and fuel and combustion in the furnace Stabilizes the state.

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 include pitch oil generated during the production of biodiesel oil using the vegetable oil, because the use of pitch oil is economically advantageous. The fatty acid ester may be used 5 to 100, more preferably 15 to 90 parts by weight with respect to 100 parts by weight of the mixture, there is a risk of fire in the mill (mill) to crush coal when more than 100 parts by weight.

Fluid paraffin, which is another component of the present invention, may be used in an amount of 5 to 50 parts by weight, more preferably 15 to 40 parts by weight, based on 100 parts by weight of the mixture. This is because when the flow paraffin exceeds 50 parts by weight, a problem of lowering the amount of heat generated occurs.

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

Example  One

After 600 g of sodium silicate was added to the reactor, 150 g of sodium hydroxide (NaOH) and 150 g of potassium hydroxide (KOH), which are alkali metal hydroxides, were added, stirred, and mixed. Thereafter, 50 g of borax was added to prepare a mixed solution. After the temperature of the mixed solution was raised to 40 ° C. by the heat of reaction, 50 g of polyhydric glycerol was added and mixed to prepare a fuel additive composition.

Example 2

400 g of methyl ester of soybean oil, 400 g of pitch oil and 200 g of liquid paraffin generated as by-products during the production of biodiesel using soybean oil were added to a reactor to prepare a mixture, and then 1000 g of a fuel additive prepared in the same manner as in Example 1 was prepared. A fuel additive was prepared by mixing with the mixture.

Experimental Example 1

After inputting coal into the pulverized coal boiler, the furnace was opened to check the condition in the furnace, and the fuel additives of Examples 1 and 2 were added to the boiler for 21 days, respectively, to reduce the pollution gas (carbon monoxide, sulfur oxides, nitrate compounds). Boiler effective heat and fuel savings were measured and the results are shown in Table 1 below.

At this time, in the case of Example 1, the fuel additive 1kg: water 40kg: coal 4000kg, in the case of Example 2 fuel additive 8kg: coal 4000kg was added, compared with the case where only 4000kg of coal.

division CO gas generation amount (ppm) SOX generation (ppm) NOX generation amount (ppm) Boiler Effective Heat (mw) Boiler Consumption Standard Coal Volume (Ton / h) Fuel saving rate (%) No fuel additives added  120 31.4 148 3.41 654 Example 1 25.5 25.2 116 3.91 633 3.4 Example 2 26.8 27.5 123 4.3 618 4.5

When the fuel additive of the embodiment was not added, it was observed that a large amount of clinker was generated in the boiler and attached to the inside. However, when the fuel additive of the embodiment was added, the clinker was removed from 80 to 97% and did not adhere to the inside of the furnace. It was confirmed. And when the fuel additive of the embodiment was added, it was confirmed that carbon monoxide is 78 ~ 79%, sulfur oxides 12 ~ 20%, nitrogen oxides 17 ~ 22% decrease. In addition, the effective heat capacity of the boiler increased by 14 ~ 26%, and the effect of 3.4 ~ 4.5% fuel reduction was shown (fuel reduction rate is GB / 10180-88 (standard of boiler boiler test for industrial boiler) and GB / T15317-94 (industrial boiler energy saving). According to the reduction method).

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Through the results of the experimental example, it was confirmed that the fuel additive of the present invention has a beneficial effect in terms of fuel reduction, pollutant reduction and durability of the furnace (爐).

Claims (6)

A fuel additive composition comprising 40 to 80% by weight of sodium silicate, 15 to 50% by weight of alkali metal hydroxide, 2 to 15% by weight of borax and 2 to 15% by weight of polyhydric alcohol. The fuel additive composition according to claim 1, further comprising 5 to 100 parts by weight of fatty acid ester and 5 to 50 parts by weight of liquid paraffin based on 100 parts by weight of the fuel additive composition. The fuel additive composition of claim 1, wherein the alkali metal hydroxide is one or two or more compounds selected from sodium hydroxide and potassium hydroxide. The fuel additive composition of claim 1, wherein the polyhydric alcohol is one or two or more compounds selected from glycerol, ethylene glycol, and diethylene glycol. The fuel additive composition of claim 2, wherein the fatty acid ester is a methyl ester of a vegetable oil selected from soybean oil, rapeseed oil, palm oil, sunflower oil or corn oil. The fuel additive composition according to claim 5, wherein the methyl ester of the vegetable oil comprises pitch oil generated during the production of biodiesel oil using the vegetable oil.