KR20090038215A - Method and apparatus thereof for manufacturing coal briquette used of by-product of material - Google Patents

Abstract

A method and an apparatus for manufacturing coal briquettes using a by-product of grained coal are provided to prevent environmental contamination by using the grained coal effectively and manufacturing the coal briquettes having high strength. An apparatus for manufacturing coal briquettes using a by-product of grained coal includes a dust collector, a grained coal hopper(10), a weighing instrument(12), a mixer(14), and a molder(30). The grained coal hopper provided the grained coal discharged from the dust collector into the mixer. The weighting instrument measures weight of the grained coal hopper. The mixer mixing the discharged grained coal and water supplied from a water supply pipe(19).

Description

Method for manufacturing coal briquettes using fine powder by-products and apparatus used therefor {Method and apparatus approximately for manufacturing coal briquette used of by-product of material}

The present invention relates to a method for manufacturing coal briquettes using fine powder by-products, and an apparatus used therein, and more particularly, to a method of manufacturing coal briquettes of high strength by collecting fine powder by-products generated in a pretreatment process of coal in a dust collector. Relates to a device.

In general, a drying facility (CMCP: Coal Moisture Control Process) used in the process of pretreatment of coal has a dryer 1 for removing moisture of coal to produce high quality coke, as shown in FIG. The dryer 1 usually has a drying capacity to remove 2-3% of the moisture of the coal.

The dust collector 2 is installed in order to discharge the steam generated inside the dryer to the outside during the drying of the coal put into the dryer 1, and relatively small ones having a particle size of 0.15 mm or less in the coal injected into the dryer are included in the dust collector. Is collected.

And the clean air is discharged to the exhaust through the stack (3), the dust collected is stored in the differential hopper (4) installed in the lower part of the dust collector.

In addition, the fine powder stored in the differential hopper 4 is 95 wt% of water supplied through the water supply pipe 7 and the binder supplied through the binder supply pipe 6A connected to the binder storage tank 6 as shown in FIG. 2. It is mixed with the 5% by weight in the mixer 5 and then supplied to the place of use with the coal, which is normally dried and transported from the dryer.

This conventional differential treatment process has the following problems.

First, the fine powder generated in the drying process using a dryer is usually a hydrophobic fine powder having a water content of 4.9% or less, which is not easily mixed with a mixture of water and a binder and is scattered into the air, causing environmental pollution. When used in coke production, it is a direct cause of reduced coke yield.

Next, when it is used in the coke production by reducing the mixing efficiency of the fine powder and the mixing agent, the charging density is reduced to become a major factor of the coke quality degradation.

Finally, when the dryer is restarted after a certain time after stopping the operation of the dryer, the amount of fine powder tends to increase rapidly as the water content of the fine powder drops to about 2%, but in the conventional fine powder treatment process, the amount of the mixture is not controlled. Therefore, the operation stability of the drying equipment is not achieved.

These problems cause the variation of the properties of the material supplied to the coke oven when the recycled fine powder is used in the coke production is a major factor that reduces the quality of the coke, and also decreases the productivity.

An object of the present invention is to solve the conventional problems as described above, the method for producing coal briquettes using fine by-products that can be produced by the high-strength coal briquettes by finding and applying the optimum conditions for manufacturing the fine coal collected in the dust collector into coal briquettes It is providing the manufacturing apparatus used.

In addition, another object of the present invention is to produce a high-strength coal briquette through the structural strength analysis according to the shape and volume change of the coal briquettes without being affected by the amount of fine dust collected in the dust collector and without using a binder to control the moisture of the fine powder The present invention provides a method for producing coal briquettes using fine powder by-products and a manufacturing apparatus used therefor.

In addition, another object of the present invention is to recycle the fine powder to produce coal briquettes of good quality to increase the coke density when using the coke production to improve the coke quality and to reduce the amount of fines generated during the charging process to improve the working environment The present invention provides a method for manufacturing coal briquettes using fine powder by-products and a manufacturing apparatus using the same to increase coke yield and improve coke productivity.

As a technical configuration for achieving the above object, the present invention is a method for producing coal briquettes using the fine powder by-product generated in the pre-treatment of coal, the step of collecting and discharging the fine powder introduced into the dust collector, Supplying water to the fine powder discharged from to adjust the moisture of the fine powder to 6.4 ~ 6.9%, and the step of forming the fine powder introduced into the molding machine into a teardrop shaped coal briquette having a volume of 24 ~ 26cc Characterized by a method for producing coal briquettes using fine powder by-products, including.

In addition, the present invention is a device for producing coal briquettes using the fine powder by-product generated in the pre-treatment of coal, a dust collector installed to filter the fine powder, and a fine hopper connected to receive and provide the fine powder discharged from the dust collector And a gravimetric meter installed to measure the weight of the fine powder hopper, a mixer installed to receive the fine powder discharged from the fine powder hopper and mixed with water supplied through a water supply pipe, and the fine powder discharged from the mixer in advance. Characterized in that the coal briquette manufacturing apparatus using the fine powder by-product, including a molding machine installed to form a coal briquette having a set size and shape.

According to the present invention, fine by-products generated during the pretreatment of coal can be made of coal briquettes of high strength suitable for use.

Thus, by effectively using the fine powder by-products can contribute to the prevention of environmental pollution, and is also effective in lowering the cost of coke production.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention includes quantitatively dispensing the largely collected fine powder, adjusting the discharged fine powder to have appropriate moisture, determining the shape and volume of the coal briquettes for high strength, and forming the fine powder appropriately. do.

Referring to FIG. 3, a balance meter 12 for measuring the weight of the differential hopper 10 is provided.

The weighing meter 12 continuously checks the weight of the differential hopper 10 so as to grasp the weight of the differential stored in the differential hopper 12.

Of course, the differential hopper 12 may have a conventional valve configuration for opening and closing the discharge passage of the fine powder, which can be adjusted so that the amount of fines discharged from the differential hopper 12 is suitable for shaping.

Of course, the fine powder discharged from the fine hopper 12 is supplied to the mixer (14).

The amount of water supplied to the mixer 14 through the water supply pipe 19 of the water storage tank 18 is adjusted according to the amount of fine powder supplied to the mixer 14. At this time, the amount of water supplied to the mixer 14 is set so that the water of the fine powder is in the range of 6.4 ~ 6.9% when the water and the fine powder are mixed.

If the fine powder is less than 6.4%, there is a problem that the fine powder and water are not easily mixed and the fine powder is scattered to the atmosphere. If the fine powder is 6.9% or more, there is a problem such as deterioration of moldability.

In addition, it is preferable to make the mixing of the fine powder and water more uniformly and quickly, and a configuration in which a plurality of paddles 16 having a wing shape are rotated by a motor not shown is suitable, and the motor has a rotation speed. It is good to have an adjustable structure.

The determination of the shape and volume of coal briquettes for high strength will be described.

In the production of high strength coal briquettes, forming workability and structural strength according to shape and volume are important factors.

As a result of various tests, it was found that teardrop shaped coal briquettes having a volume of 24 to 26 cc had optimal conditions using fine powder having a water content of 6.4 to 6.9%.

The test example which finds the optimal conditions for manufacture of coal briquettes is demonstrated below.

As a result of manufacturing the coal briquettes by using the five shapes of the mold 20, as a result of forming a teardrop-shaped coal briquettes, more than 98% of the coal briquettes are separated from the mold and excellent in separability, whereas other coal briquettes are formed. More than 10% of the molds were not separated, so the separability was poor.

As a result of manufacturing coal briquettes of 25cc and 35cc in volume by changing the shape of the tear drop in various forms, that is, the conventional one, the both ends are rounded, and both ends are longer, The workability did not change significantly, but the workability was the best when the shape was a conventional conventional one.

Measure the structural strength according to the shape of the coal briquettes, ie compressive strength (shown in FIG. 5), drop strength (shown in FIG. 6), loading density (shown in FIG. 7) and cold strength (shown in FIG. 8) As a result, in the case of the teardrop shape, the compressive strength increases while the drop and the loading density decrease as the volume increases.In particular, the 25cc teardrop coal and the 35cc square coal briquette have the compressive strength, the drop strength, and the charge load. It was found to be the best in density and cold strength.

In addition, it was found that it is suitable to prepare teardrop coal briquettes with 98% of tear coal and 92% of square coal briquettes in terms of forming workability of the coal briquettes.

In addition, as a result of testing the shaping and structural strength of the coal briquettes according to the moisture change of the fine powder, it was found that the moldability and structural strength were excellent when the moisture content was 6.4 to 6.9%.

In the graphs of FIGS. 5 to 8, the dropping strength or drum strength shown in the vertical axis of the graph of FIG. 6 or the vertical axis of the graph of FIG. 8 is expressed in%. The number of coal briquettes remaining unbroken when the coal briquettes are dropped is expressed as a percentage. In the case of drum strength, the number of coal briquettes remaining unbroken when a certain number of coal briquettes are rotated is put in a tester that rotates at a constant speed. Is expressed in%.

And, F shown in the horizontal axis of the graph of Fig. 8 is a shape factor, measuring the transverse length, longitudinal length and thickness of coal briquettes of any shape, and having a largest size among the transverse length, vertical length and thickness as a The remainder is b and c, and the number substituted into the formula of F = 1-{(b + c) / 2a} is shown.

That is, if the transverse length, longitudinal length, and thickness of a coal briquette of one shape are measured, and the transverse length has the largest size, the transverse length is a and the longitudinal length or thickness is b or c. For example, in the case of spherical coal briquettes, the values of a, b, and c are all the same, so that the value of F is zero.

A method of producing coal briquettes under optimum conditions using the above apparatus will be described next.

The amount of fine powder flowing into the fine hopper 10 is understood as the weight measured in the weigh scale 12.

That is, it is determined whether the amount of fines flowing into the fine hopper 10 is high (high) or medium (medium) or low (low) based on the preset weight.

The amount of fines to be dispensed from the fine hopper 10 is set according to the amount of fines flowing into the fine hopper 10.

For example, if the amount of fines introduced into the fine hopper 10 is set to be high in the amount of fines discharged from the fine hopper 10 (for example, 12 tons / hour), and the amount of fines introduced into the fine hopper 10 If the amount is medium, the amount of fines discharged from the fine hopper 10 is set to medium (for example, 6 tons / hour), and if the amount of fines introduced into the fine hopper 10 is small, the fine hopper 10 Suspend payment of derivatives from.

Then, the rotational speed of the paddle 16 of the mixer 14 is set in proportion to the amount of fines discharged from the differential hopper 10.

In addition, the operating state of the molding machine 30 is set according to the amount of fine powder discharged from the mixer 14 and supplied to the molding machine 30.

For example, the hydraulic equipment and the variable motor operate in conjunction with each other so that the compressive strength of the fine powder by the molding die of the molding machine 30 can be maintained at a predetermined value, for example, 20 kg / cm 2. The speed is proportionally controlled.

Also, if the amount of fines supplied to the molding machine exceeds the processing capacity of the molding machine (eg 12 tons / hour), the fine powder is prevented from entering the fine hopper and the dust collected in the dust collector is dropped onto the belt through the bypass chute. To be transported with the dried coal.

Supplying an appropriate amount of water to the fine powder inflow also has a direct effect on the strength of the coal briquettes, so that the amount of water supplied in proportion to the rotational speed of the paddle is set proportionally, so that the moisture of the fine powder supplied to the molding machine in an appropriate range.

When the interval and rotation speed of the mold are automatically adjusted in conjunction with the amount of fine powder processed, high strength coal briquettes are supplied to the coke oven equipment to prevent environmental pollution due to the reduction of fine powder scattering and carry over amount to the chemical conversion process. Not only has the effect of reducing and increasing the coke recovery, but also the coagulation strength can be increased by increasing the charge density by maintaining a differentiation rate of about 5% when transporting by the belt.

For example, when the fine powder generated during the drying of coal in the dryer is molded into coal briquettes and charged into a coke oven to increase the loading density by about 10 kg / m 3, the coke strength is improved by about 0.2%.

In addition, when the fine powder generated during the pretreatment process of coal in the dryer is made of coal briquettes by adding only water without addition of a binder, coke production cost can be lowered.

1 is a schematic configuration diagram showing a general coal drying equipment used in the process of pretreating coal;

FIG. 2 is a detailed view of an apparatus for treating fine by-products of the facility shown in FIG. 1; FIG.

3 is a schematic configuration diagram showing the coal briquette manufacturing apparatus according to the present invention as a whole;

4 shows a mold used to manufacture coal briquettes;

5 is a view showing the compressive strength according to the shape of coal briquettes;

6 is a view showing drop strength according to the shape of coal briquettes;

7 is a view showing a charging density according to the shape of coal briquettes;

8 is a diagram showing the relationship between the function F and the cold strength (fall / drum) affecting the coal briquettes.

※ Explanation of symbols for main part of drawing ※

10: differential hopper

12: basis weight meter

14: mixer

16: paddle

18: water storage tank

19: water supply piping

30: molding machine

Claims (6)

As a method of manufacturing coal briquettes using fine by-products generated during the pretreatment of coal, Collecting and discharging the fine powder introduced into the dust collector; Supplying water to the fine powder discharged from the dust collector to adjust the moisture of the fine powder to 6.4 to 6.9%, Forming the fine coal introduced into the molding machine through the step to form a teardrop-shaped coal briquette having a volume of 24 ~ 26cc, coal briquette production method using the fine powder by-product. The method of claim 1, The method of claim 1, wherein the amount of fine powder discharged from the dust collector is set to be proportional to the amount of water supplied. The method of claim 1, The method of claim 1 further comprising the step of uniformly mixing the fine powder and water discharged from the dust collector using a blade-shaped paddle rotating at a predetermined speed. The method of claim 3, The rotation speed of the paddle is characterized in that it is set to be proportional to the amount of fines discharged from the dust collector, coal briquette manufacturing method using the fine powder by-product. An apparatus for manufacturing coal briquettes using fine by-products generated during the pretreatment of coal, A dust collector installed to filter out the fine powder, A differential hopper connected to receive and provide the fines discharged from the dust collector; A gravimetric meter installed to measure the weight of the differential hopper; A mixer installed to receive the fine powder discharged from the fine hopper and mix with water supplied through a water supply pipe; A coal briquette manufacturing apparatus using fine coal by-products, including a molding machine configured to receive fine powder discharged from the mixer and to form coal briquettes having a predetermined size and shape. The method of claim 5, The coal briquette manufacturing apparatus using the fine powder by-products, characterized in that the amount of water supplied to the mixer has a configuration that is linked to each other controlled so as to change by the weight of the differential hopper measured in the weighing meter.

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