KR20020011640A - Process for producing high temperature coal with low-environmental pollution effect by using low-grade coal material and additive composition for the same - Google Patents

Abstract

PURPOSE: A method for manufacturing low pollution high temperature coal is provided which generates a high quantity of heat even with the addition of the minimum amount of an additive, and a composition of an additive is provided which is usefully used in manufacturing the low pollution high temperature coal. CONSTITUTION: The composition of an additive for low pollution high temperature coal is characterized in that iron oxide(II), silica, granite, sulfur, talc and diatomaceous earth are contained in amounts of 12 to 17 wt.%, 17 to 22 wt.%, 10 to 13 wt.%, 7 to 10 wt.%, 3 to 7 wt.% and 33 to 47 wt.% respectively based on a weight of the total composition, and each constituents are in a powder shape in the particle size range corresponding to 50 to 120 meshes. The method for manufacturing low pollution high temperature coal is characterized in that the low pollution high temperature coal is manufactured by mixing a composition of an additive for low pollution high temperature coal in an amount of 0.0001 to 0.01 wt.% for the amount of low-grade coal, wherein the composition of the additive for low pollution high temperature coal comprises 12 to 17 wt.% of iron oxide(II), 17 to 22 wt.% of silica, 10 to 13 wt.% of granite, 7 to 10 wt.% of sulfur, 3 to 7 wt.% of talc and 33 to 47 wt.% of diatomaceous earth respectively based on a weight of the total composition, and each constituents are in a powder shape in the particle size range corresponding to 50 to 120 meshes.

Description

Manufacture of low-pollution high-temperature coal from low-carbon coal and additive composition for the same

The present invention relates to an additive composition capable of increasing the calorific value and combustion time of low-carbon coal and a method for producing low-pollution hot coal using the same.

Specifically, the present invention relates to a special additive composition composed of anthracite coal, graphite, and other similar minerals, to improve low coal over 2,000 kcal / kg upon combustion, and to increase both calorific value and combustion time.

In addition, the present invention can add the additive composition to the low-carbon coal as a sample to maintain the temperature and combustion time comparable to conventional coal (4,600 kcal / kg), and also harmful gases generated during combustion, that is, SO ₂ , CO , CO ₂ and the like to produce an excellent low-pollution hot coal is significantly reduced than the conventional coal.

The low-pollution hot coal thus produced is molded into domestic briquettes and industrial fuels according to a conventional production process.

There have been many studies on how to increase calories by adding a catalyst to anthracite, graphite, and other low-carbon coal.

This method was not economical because it requires a large amount of additives, and also had a disadvantage in that the catalyst in the coal loses the catalytic function when the external temperature changes after the coal making (production of coal).

In particular, referring to the contents of Korean Patent Publication No. 82-1103 among the prior arts introduced in Korea, low anthracite coal and vegetable carbide are commonly used as main materials, and various oxidants are mixed therein to increase combustion efficiency by supplying oxygen to itself during combustion. It has been introduced that there are many examples of non-toxic coal, high-temperature, high-calorie coal briquettes by mixing potassium nitrate, sodium sulfate, potassium chlorate and the like as low-temperature coal or complex coal as a technology or a combustion aid or combustion accelerator.

Nevertheless, he pointed out that long-term combustion is impossible and explained that it is necessary to increase the mixing ratio of low anthracite coal in order to extend the combustion time.

Therefore, in the case of the patent, the coal briquettes containing the low anthracite coal are mixed with potassium hydrogen sulfate, thorium oxide, and cerium oxide, thereby releasing calories of completely burned, high heat, and high calorie, and particularly, for long-term combustion. A manufacturing method has been proposed.

In addition, as another patent, Korean Patent Publication No. 85-895 discloses a method of manufacturing briquettes using graphite anthracite coal, which has a large amount of heat and significantly reduces the emission of harmful gases. Here, it was pointed out that the general briquettes had problems such as calories of about 4,500 to 4,600 kcal / kg, a short burning time, and a large amount of harmful gas were generated, and suggested a solution.

That is, high-quality graphite anthracite coal, starch, limestone, diatomaceous earth, etc. are mixed and steamed in a steam container at 200 to 500 ° C. for about 5 minutes, and then a method of manufacturing high calorie coal is introduced.

In view of its technical composition, first of all, as a "adhesive for shaping" 2% by weight of starch, as a molding aid and a small amount of harmful gases can be adsorbed to 47% by weight of high quality graphite anthracite and 47% by weight of anthracite. 2% by weight of limestone acting as phosphorus and 2% by weight of diatomaceous earth to give strength to briquettes are mixed and steamed for about 5 minutes by putting the mixture into a steam container at 200 to 250 ° C. .

In this heating step, the adhesion of starch is enhanced, and the function of adsorbing harmful gases of limestone is also improved.

The resultant material was molded in a conventional briquette lubricator and made into a final product briquette.

However, the above-mentioned Korean Patent Publication No. 82-1103 relates to the use of thorium oxide or potassium hydrogen sulfate as an additive to enhance the complete combustion effect of briquettes, and also the Korean Patent Publication No. 85-895 describes diatomaceous earth, limestone and Starch or the like was used to improve the formability of the final product and to obtain the effect of reducing the amount of emission by adsorbing some harmful gases.

Therefore, the method of producing high-temperature (calorie) coal which can emit high calorie without being influenced by external conditions, especially physicochemical effects by temperature change, has not been introduced until now.

In particular, the method of adding a catalyst to increase the calorific value of coal has been studied in various ways, but using a small amount of the catalyst as possible to increase the economics of the product is a challenge.

The present invention is designed to solve the above-mentioned problems, that is, the disadvantage of using a large amount of additives to increase the calories and the disadvantage that the catalytic function of such additives is lost due to the physicochemical reaction by the change of the external temperature, It is an object of the present invention to provide a method for producing a low-pollution hot coal which can generate a high calorific value even by adding an additive.

It is another object of the present invention to provide a preferred additive composition which is usefully used in producing the low pollution hot coal.

When the additive composition of the present invention, which is developed to achieve the above object, is added to existing low-carbon coal to produce high-temperature coal, a long burning time and a significant calorie improvement effect can be obtained.

In addition, the emissions of harmful gases, particularly CO ₂ or SO ₂ can be greatly reduced, and since the ash remaining after combustion has a large particle pore, it can also be used for plant growing soil.

Therefore, the low-pollution hot coal of the present invention has the advantage that it can be produced at a much lower cost than ordinary carbon by using a low-carbon coal as a main material and using an excellent additive composition which shows an excellent effect even if only a small amount is added.

In addition, in terms of calories and combustion time, the efficiency is comparable to that of conventional coal, and the generation of particularly harmful gas is considerably reduced. Therefore, it is considered that the new product can replace the coal.

The present invention provides a method for producing low-pollution hot coal by adding an additive composition consisting of iron (II) oxide, silica, granite, sulfur, talc, diatomaceous earth, heavy earth and the like in a very small amount of about 1 g per 40 kg of low-carbon coal. The above-mentioned heavy soil refers to old soil having fine grain, such as tidal soil.

The additive composition is 12-17% by weight of iron (II) oxide, 17-22% by weight of quartzite, 10-13% by weight of granite, 7-10% by weight of sulfur, talc 3-7% by weight, diatomite 33-47% by weight, heavy earth 14-17% by weight, wherein each component is 50 to 120 mesh in size.

Among these components, iron (II) oxide, silica and granite are pulverized by a high-speed precision grinder, mixed into fine powders, frozen and frozen at minus 170 ℃ for 60 to 80 minutes, and then heat-treated at 1,400 ℃ for 5 to 60 minutes. .

Then, the mixture of sulfur, talc, diatomaceous earth and heavy earth in a solid form having a size of about 120 mesh is uniformly mixed in an appropriate weight ratio, and then hydrogen gas (H ₂ ) is 14 to 17 weight by spray injection. Add by%.

Here again, 1,000cc to 5,000cc of high pressure high temperature steam is added for 5 to 30 minutes to form a dough-containing composition containing moisture.

The additive composition formed as described above is dried to be added in a powder form of about 50 to 120 mesh and is added in an amount of 0.0001 to 0.01% by weight, preferably about 1 g per 40 kg of sample, based on low-carbon coal as a main material.

The resultant low-pollution hot coal is produced and the hot coal is finalized into powdered coal or perforated coal according to the usual production method. At this time, the low coal is in the form of a powder having a size of about 60 to 120 mesh.

The low-pollution hot coal of the present invention provides a useful effect according to the principle that the additive contained therein increases the pressure of hydrogen and oxygen in the low-carbon coal and thus burns the fixed carbon in the carbon-carbon at high temperature to release high calories.

At this time, the lowest temperature required for burning low-carbon coal, that is, the ignition temperature is 500 ℃ and should be heated continuously for about 60 minutes.

In the case of mass production of low-pollution hot coal, the additive composition of the present invention is usually added and mixed in a range of 0.0001 to 0.01% by weight with respect to a sample such as low-grade coal or blended coal, preferably in a ratio of about 1 g per 40 kg of sample. Are mixed. For reference, in a typical production process, the one-time production of hot coal is 5 to 6 kg.

The hot coal manufactured as described above is not affected by physicochemical effects even under changes in external temperature or weather.

In particular, as implemented in the following examples, the hot coal of the present invention generates a high calorific value when burned, significantly reduces the amount of harmful gases, and also has a combustion time much longer than that of general commercial coal briquettes, which is not affected by physicochemical effects. Prove that you did not.

EXAMPLE

Example 1 Preparation of Additive Composition

An additive composition consisting of iron (II) oxide, silica, granite, sulfur, talc, diatomaceous earth, and heavy soil will be prepared.

First, iron (II) oxide, silica and granite are pulverized by a high-speed precision grinding machine to make fine powder. Each component has a powder size ranging from 50 to 120 mesh. After mixing them, they were freeze-frozen at minus 170 ° C. for 60 to 80 minutes and heat-treated at 1,400 ° C. for 5 to 60 minutes, and sulfur, talc, diatomaceous earth, and heavy earth in the form of solid powders having a particle size of about 120 mesh were required. Accordingly added in an appropriate amount and mixed uniformly.

After the hydrogen gas was added to the mixture by injection injection at 17 to 14% by weight, a high-pressure, high-temperature steam was added in an appropriate amount for 5 to 30 minutes, in particular in an amount ranging from 1,000 cc to 5,000 cc to form a dough-containing composition. Make it.

The composition ratio of the components is expressed as Table 1 below based on the weight percentage of the entire mixture.

TABLE 1

ingredient Composition (% by weight) Iron oxide (II) 12-17 burr 17-22 Granite 10-13 brimstone 7-10 talc 3-7 Diatomaceous earth 33-47 Heavy soil 14-17

Example 2 Combustion Test of Low Pollution Hot Coal

The additive composition prepared as described above is dried to prepare a powder form of about 50 to 120 mesh. A low-pollution hot coal was prepared by directly injecting the additive 1g per 40 kg of low-carbon coal. At this time, the low-carbon coal size is in the range of 60 to 120 mesh.

The combustion test of the hot coal showed that when burned, it generates high calorific value, significantly reduces the amount of harmful gas, and the combustion time is much longer than that of commercial coal briquettes. This demonstrates that the hot coal of the present invention is not affected by physicochemicals.

[Combustion test result]

Compared to: K = Standard Bullet (3.5kg)

S = hot coal of the present invention (5.0 kg)

1. Total Heat Retention

-K; 4,020kcal / kg X 3.5kg = 14,070 kcal

-S; 3,010kcal / kg X 5.0kg = 15,050 kcal

As can be seen from the above, the hot coal of the present invention, that is, S has a smaller amount of heat per kilogram than the conventional coal, but the weight is about 1.5kg heavier, so the total heat retention was found to be similar.

2. Burning time

(A) Comparison of calories by burning time:

Burning time (hours) 4 5 6 7 8 K (kcal / kg) 3,517 2,814 2,345 2,010 1,759 S (kcal / kg) 3,762 3,010 2,508 2,150 1,881

(B) As a result of comparing the burning time (from the cap to the end of the test), K was 7.5 hours on average, while S was 8.5 hours, which was about 1 hour longer.

3. Hazardous gases in combustion gases (SO ₂ , CO ₂ )content

The amount of SO ₂ generated during the entire combustion time, that is, the SO ₂ content in the combustion gas, was about 2,500ppm while S was about 1,400ppm. That is, when this is expressed as a relative ratio, the amount of SO ₂ generated in the present invention is reduced by about 30 to 35% by weight. Similarly, CO2 emissions were estimated to be reduced by 50-60% by weight.

As described above, the high-temperature coal prepared by adding the additive composition of the present invention to the existing low quality coal has a long burning time and a significant calorific improvement effect similar to that of ordinary coal. In addition, the emissions of harmful gases, particularly carbon dioxide and SO ₂ can be greatly reduced, and the remaining ash after combustion has a large particle pore size, which can be used for plant growing soil. Therefore, according to the present invention, it is possible to produce high-temperature coal having an effect of removing harmful gases as well as achieving excellent heat and long-term combustion time comparable to the existing coal at low cost.

Claims (4)

Iron (II) oxide, silica, granite, sulfur, talc, diatomaceous earth, and heavy soils are 12-17%, 17-22%, 10-13%, and 7-10% by weight, respectively, based on the weight of the total composition. , 3-7% by weight, 33-47% by weight and 14-17% by weight and each component is a low-pollution hot coal additive composition, characterized in that the powder form in the range of 50 to 120 mesh size. Iron (II) oxide, silica, granite, sulfur, talc, diatomaceous earth and heavy earth in powder form in the particle size range of 50 to 120 mesh, respectively, 12-17% by weight, 17-22% by weight, 10-13% by weight, 7-10% by weight, 3-7% by weight, 33-47% by weight and 14-17% by weight, After freezing and freezing at 170 ° C. for 60 to 80 minutes, heat treatment was performed at 1,400 ° C. for 5 to 60 minutes, and further, a solid powder of sulfur, talc, diatomaceous earth, and heavy earth soil having a particle size of 120 mesh was further added to the heat treated material. Homogeneous mixing, The additive composition for low-pollution hot coal is characterized in that the hydrogen gas is added in a spray injection method at 14 to 17% by weight, and then a high-pressure high-temperature steam of about 1,000 to 5,000 cc is added for 20 to 30 minutes to form a dough containing moisture. Manufacturing method. Iron (II) oxide, silica, granite, sulfur, talc, diatomaceous earth, and heavy soils are 12-17%, 17-22%, 10-13%, and 7-10% by weight, respectively, based on the weight of the total composition. , 3-7 wt%, 33-47 wt% and 14-17 wt%, each component in the form of a powder in the range of 50-120 mesh particle size, in an amount ranging from 0.0001-0.01 wt. Method for producing a low-pollution hot coal, characterized in that the mixing to produce. The method of claim 3, wherein The low-carbon coal is a powder form, the size of which is in the range of 60 to 120 mesh, low-pollution hot coal production method.