KR20090072120A - Method for crushing coal - Google Patents

Abstract

A coal crushing method capable of producing coal having desired average granularity is provided to reduce difference of granularity of coke loaded on a coke oven by grinding the coal containing average granularity which is over a target value. A coal crushing method comprises the following steps of: discharging the coal loaded(S100); storing data of the discharged coal(S110); grinding the coat by adjusting an interval of a hammer and a repeller of a coal crushing apparatus with the data(S300); and storing the grinded coat in a predetermined hopper(S700). The data of the coal includes the fine coal content data.

Description

Method for crushing coal

The present invention relates to a coal crushing method, and more particularly, to a coal crushing method to obtain a coal having a desired average particle size by adjusting the interval of the coal crushing device in accordance with the type of coal.

In general, coke is produced by combining 10-12 species of coal in a coal storage and charging it in an oven and then heating it, where the flow of each coal and the size of the inert material have a great influence on the coke quality. The flow rate of the coal and the size of the inert material are closely related to the particle size of the coal. In order to control the coal, the coal is crushed and selected to a predetermined particle size, and then transported to a coal storage. The particle size distribution of each coal is different before the coal is crushed. The lower the flow rate of coal and the higher the content of inert materials, the more fine coals are charged into the coke oven and the uniformity of thermal decomposition of coals and the homogeneity of active materials are required during the coal briquetting process. The method of crushing such coal is as follows.

1 is a flow chart showing a conventional coal crushing method.

As shown in FIG. 1, conventionally discharging coal unloaded (S10), acquiring coal type data (S11), and crushing the discharged coal (S30), and corresponding bins according to the obtained coal type data. Transfer to (S50), the crushed coal was stored in the bin (S70). If the type data and the bin do not match, the trip device was moved (S60) to store the crushed coal in the bin.

Here, the coal crushing apparatus 100 is located on the lower side of the hopper 110, the coal is charged, to process the particles of coal that is the raw material of the coke, as shown in FIG. Is introduced into the mixing bin 130 through the belt conveyor 120 on the lower side. And, as shown in FIG. 3, the coal crushing apparatus 100 includes a plurality of hammers 140 mounted and rotated in the rotor 137 inside the hollow casing 135 and the hammers 140. The hammer 140 rotates in a circular space between the plurality of reaction plates 145 forming a semi-circular cross section on the outer side of the. In addition, the hydraulic cylinder 150 for displacing the transverse position of the reaction plate 145 is mounted on the outer upper and lower sides of the reaction plate 145, the operation of the hydraulic cylinder 150 and the hammer 140 and the reaction plate ( When the interval p between the 145 is appropriately maintained and the coal to be crushed is introduced between the hammer 140 and the repellent plate 145, the coal may be crushed to a desired particle size according to the interval of the coal.

The particle size management standard of crushed coal contains 82 ± 2% by weight or more of coal having an average particle size of 3 mm or less. Conventionally, the coal mixture containing 10 to 12 types of coals is managed every 8 hours without controlling the particle size of each coal. The driver manually adjusts the distance between the hammer 140 and the repellent plate 145 of the coal crushing device 100 according to the particle size trend by manually analyzing the particle size once.

Problems in such a conventional coal crushing method are as follows.

First, without considering the effects of coke quality according to the flow rate and inert material content for each coal, only 10 ± 12 types of coal containing 82 ± 2% by weight or more of coal having an average particle size of 3 mm or less collectively Because of the control, the particle size variation occurs when the coal type of coal used for blending is changed. This causes the coke quality deviation, and coal species having a large amount of fine coal in the particle size distribution of coal before coal crushing in the coal crushing apparatus 100 is over-crushed, causing carbon formation in the upper part of the oven during coking and during coal transportation. Problems such as scattering have occurred.

Second, the average particle size is adjusted only once every 8 hours because the hammer 140 and the repellent plate 145 of the coal crushing plant 100 are controlled to contain more than 82 ± 2% by weight of coal having an average particle size of 3 mm or less. Difficult to manage

Third, since the driver manually adjusts the distance between the hammer 140 and the rebound plate 145 of the coal crushing facility 100 to meet the average particle size of the coal mixture required, the correct hammer 140 and the rebound plate 145. Difficult to adjust spacing

 As the above problems cause variation in the particle size of the coal briquettes charged in the coke oven, the situation is acting as a main cause of the deterioration of the coke quality and pollution of the working environment.

The present invention has been made to solve the above problems, and to provide a coal crushing method to reduce the particle size variation of the coal blended in the coke oven by crushing the coal to contain the average particle size above the target value. The purpose.

The present invention, the step of discharging the coal coal; Storing data of the coal discharged; Crushing coal by adjusting a distance between the hammer and the crushing plate of the coal crushing device based on the discharged coal data; And storing the crushed coal in a corresponding storage bin in accordance with the data of the discharged coal.

Here, the discharged coal data may include fine coal content data of the coal.

In addition, after the step of crushing the coal, determining whether the content of the coal having a target particle size of the crushed coal has reached a target value; And adjusting the distance between the hammer and the rebound plate of the coal crushing device when the target value is not reached.

At this time, the step of determining the crushed coal, it may be a step of determining whether the coal having an average particle size of 3 mm or less contains 82 ± 2% by weight.

In addition, the step of determining whether the target value has been reached, taking a sample of the crushed coal; Drying the sample; Measuring the weight of the dried sample; Determining whether the sample has a particle size of 3 mm or less; Measuring the weight of the sample of greater than 3 mm particle size and comparing it with the weight of the dried sample; And determining whether the sample having a particle size greater than 3 mm is less than 18 ± 2 wt% with respect to the dried sample.

The present invention, the step of discharging the coal coal; Crushing the discharged coal; Determining whether a content of coal having a target particle size of the crushed coal has reached a target value; Adjusting a distance between the hammer of the coal crushing device and the rebound plate when the target value is not reached; And it provides a coal crushing method comprising the step of storing the crushed coal in the storage bin.

Here, the determining of the crushed coal may be a step of determining whether the coal having an average particle size of 3 mm or less is contained in 82 ± 2% by weight or more.

According to the coal crushing method according to the present invention as described above, it is possible to provide a coal crushing method to reduce the particle size variation of the coal blended in the coke oven by crushing the coal so as to contain the average particle size above the target value.

Hereinafter, a coal crushing method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.

4 is a flowchart showing a coal crushing method according to a first embodiment of the present invention.

According to Figure 4, the coal crushing method according to the first embodiment of the present invention, the step of discharging the coal unloaded (S100), storing the data of the discharged coal (S110), coal as the data of the discharged coal Determining whether the hammer and the crushing plate of the shredding device is suitable (S200) and if not suitable by adjusting the interval (S210) to shred the coal (S300) and the coal shredded by the data of the coal discharged Determining whether it is stored in the storage bin (S500) and moving the trip device to transfer the crushed coal to the storage bin if it is not stored in the storage bin (S600) and storing the stored bin in the storage bin (S700). Include.

The coal coal is discharged as much as a desired amount with a conventional dispensing apparatus (S100). At this time, the type of coal is input to the controller provided separately (S110). At this time, the information input to the control unit is information such as what kind of coal, what is the average particle size of the coal and how much fraction of the coal having an average particle size of the total coal is input. For example, it may be input how many weight% or more of coal of an average particle size of 3 mm or less occupies. The discharged coal may be transferred to a later process through a conveying means such as a conveyor belt.

The transferred coal is crushed through the coal crushing apparatus (S300). At this time, before the coal is crushed, it is determined whether the distance between the hammer of the coal crushing device and the rebound plate is matched through the information of the controller in which the type of coal is input (S200). If the gap between the hammer and the crushing plate does not correspond to the type of coal, a separate gap adjusting step (S210) is performed to match the coal, and the coal is crushed through the gap crushing device. As an example of adjusting the spacing, as the coal content with an average particle size of 3 mm or less increases, the gap between the hammer and the backplate of the coal crusher is spaced apart, and as the coal content with an average particle size of 3 mm or less decreases, the gap between the hammer and the backplate Can be approximated. In addition to the average particle size, the spacing may be adjusted according to the content of coal satisfying the average particle size condition. That is, when the content of coal satisfying the average particle size condition is less than the standard, it is possible to close the gap between the hammer and the backing plate. Adjusting the gap between the hammer and the crushing plate is one easy example for adjusting the particle size of the coal to be crushed, and other means for adjusting the particle size of the coal may be reflected.

The crushed coal is transferred to a storage bin through a separate transport means such as a trip device, and the storage bin stores coal in a corresponding storage bin according to the type of coal (S700). At this time, it is determined whether the corresponding storage bin according to the type of coal (S500), by moving the trip device for transporting the crushed coal to the storage bin (S600) to store the coal.

In general, the raw pulverized raw coal is piled by type through data such as the average particle size, the average particle size or the fraction of coal below, so that the fine coal crushed through the coal crushing method according to the first embodiment of the present invention as described above. The particle size variation can be reduced. That is, since the information of the raw coal is input to the control unit, the input information can be transmitted to the coal crushing device to determine the degree of crushing in advance, thereby reducing the particle size variation due to over- or crushed as compared with the conventional example.

5 is a flowchart illustrating a coal crushing method according to a second embodiment of the present invention.

According to FIG. 5, in the coal crushing method according to the second embodiment of the present invention, the step of discharging the unloaded coal (S100), storing the data of the discharged coal (S110), and crushing the discharged coal (S300), analyzing the crushed coal and reflecting it to the coal crushing device (S400) and determining whether the crushed coal is stored in the storage bin (S500) and the storage bin with the data of the discharged coal (S500) If not stored, the step of moving the trip device to transfer the crushed coal to the storage bin (S600) and storing in the storage bin (S700).

The coal coal is discharged as much as a desired amount with a conventional dispensing apparatus (S100). At this time, the type of coal is input to the controller provided separately (S110). At this time, the information input to the control unit is information such as what kind of coal, what is the average particle size of the coal and how much fraction of the coal having an average particle size of the total coal is input. For example, it may be input how many weight% or more of coal of an average particle size of 3 mm or less occupies. The discharged coal may be transferred to a later process through a conveying means such as a conveyor belt.

The transferred coal is crushed through the coal crushing apparatus (S300). After the coal is crushed, it is determined whether the content of the coal having the target particle size has reached the target value and subjected to the step of reflecting it in the coal crushing apparatus (S400). In this case, the target particle size may be 3 mm or less in average particle size, and the target value may be 82 ± 2% by weight. That is, it can be discriminated whether 82 +/- 2 weight% or more of coals with an average particle size of 3 mm or less are contained.

Determining the coal and reflecting it to the coal crushing apparatus (S400) may go through the following process.

First, the sample of the crushed coal is collected by a sampling means such as a spoon (S410), the sample is dried (S420), and then the first weight of the dried sample is measured by a measuring means such as a scale (S430). . After measuring the first weight, the sample is classified using a screen device or the like based on a reference particle size, for example, a particle size of 3 mm (S440). The sample below the reference particle size is transferred to a subsequent process, and the second weight is measured by collecting samples exceeding the reference particle size, for example, more than 3 mm. Thereafter, it is determined how much the ratio of the second weight to the measured first weight is (S460). For example, it may be determined whether the second weight of the sample larger than 3 mm is less than 18 ± 2 wt% of the first weight. At this time, the sample which is 3 mm or less becomes 82 +/- 2 weight%. Therefore, it is possible to determine whether the content of coal satisfying the reference particle size (3 mm) satisfies the reference content (82 ± 2% by weight). When the second weight of the sample is not less than 18 ± 2% by weight, the coal is crushed by adjusting the distance between the hammer and the backplate of the coal crusher (S310). As an example of adjusting the gap between the hammer and the crushing plate, when the content of coal having a reference particle size is less than the reference content, the gap between the hammer and the crushing plate may be approached. If the second weight of the sample is less than 18 ± 2% by weight, since the coal having a reference particle size is greater than the reference content, the coal crushing apparatus may not be readjusted.

Instead of determining how much the ratio of the second weight to the first weight is (S460), as shown in FIG. 6, an average particle size of the samples exceeding the reference particle size is measured (S450) and measured. Comparing the average particle size with the standard particle size (S460 ′) may be performed. At this time, when the particle size of the samples exceeding the reference particle size is matched within ± 1% of the reference particle size, the crushing operation is performed without adjusting the gap between the hammer and the rebound plate of the coal crushing device, the sample exceeding the standard particle size When the particle size of these particles is separated by more than ± 1% of the standard particle size, the crushing may be performed by adjusting the distance between the hammer and the repellent plate of the coal crushing device by about 15 mm.

Adjusting the distance between the hammer and the crushing plate of the coal crushing device is one easy example for adjusting the particle size of the coal to be crushed, and other crushed coal particle size adjusting means may also be reflected.

The crushed coal is transferred to a storage bin through a separate transport means such as a trip device, and the storage bin stores coal in a corresponding storage bin according to the type of coal (S700). At this time, it is determined whether the corresponding storage bin according to the type of coal (S500), by moving the trip device for transporting the crushed coal to the storage bin (S600) to store the coal.

In this way, by taking a sample of the crushed coal and reflecting it again to the coal crushing device, it is possible to control the average particle size of the crushed coal, it is possible to reduce the particle size variation by the control of the average particle size. Therefore, the target content of coal having the target particle size can be more easily satisfied than the conventional example.

7 is a flowchart illustrating a coal crushing method according to a third embodiment of the present invention.

According to FIG. 7, in the coal crushing method according to the third embodiment of the present invention, the step of discharging the unloaded coal (S100), storing the data of the discharged coal (S110), and coal as the data of the discharged coal Determining whether the hammer and the crushing plate of the shredding device is suitable (S200) and if it is not suitable to adjust the gap (S210) to shred the coal (S300), to analyze the shredded coal and analyze it in the coal shredding device Determining whether the crushed coal is stored in the storage bin (S400) and the data of the discharged coal (S500) and if not stored in the storage bin tripped to transfer the crushed coal to the storage bin Moving the device (S600) and storing in the storage bin (S700).

The coal coal is discharged as much as a desired amount with a conventional dispensing apparatus (S100). At this time, the type of coal is input to the controller provided separately (S110). At this time, the information input to the control unit is information such as what kind of coal, what is the average particle size of the coal and how much fraction of the coal having an average particle size of the total coal is input. For example, it may be input how many weight% or more of coal of an average particle size of 3 mm or less occupies. The discharged coal may be transferred to a later process through a conveying means such as a conveyor belt.

The transferred coal is crushed through the coal crushing apparatus (S300). At this time, before the coal is crushed, it is determined whether the distance between the hammer of the coal crushing device and the rebound plate is matched through the information of the controller in which the type of coal is input (S200). If the gap between the hammer and the crushing plate does not correspond to the type of coal, a separate gap adjusting step (S210) is performed to match the coal, and the coal is crushed through the gap crushing device. As an example of adjusting the spacing, as the coal content with an average particle size of 3 mm or less increases, the gap between the hammer and the backplate of the coal crusher is spaced apart, and as the coal content with an average particle size of 3 mm or less decreases, the gap between the hammer and the backplate Can be approximated. In addition to the average particle size, the spacing may be adjusted according to the content of coal satisfying the average particle size condition. That is, when the content of coal satisfying the average particle size condition is less than the standard, it is possible to close the gap between the hammer and the backing plate.

After the coal is crushed, it is determined whether the content of the coal having the target particle size has reached the target value and subjected to the step of reflecting it in the coal crushing apparatus (S400). In this case, the target particle size may be 3 mm or less in average particle size, and the target value may be 82 ± 2% by weight. In other words, it can be determined whether or not coal having an average particle size of 3 mm or less is contained in 82 ± 2% by weight or more.

Determining the coal and reflecting it to the coal crushing apparatus (S400) may go through the following process.

First, the sample of the crushed coal is collected by a sampling means such as a spoon (S410), the sample is dried (S420), and then the first weight of the dried sample is measured by a measuring means such as a scale (S430). . After measuring the first weight, the sample is classified using a screen device or the like based on a reference particle size, for example, a particle size of 3 mm (S440). The sample below the reference particle size is transferred to a subsequent process, and the second weight is measured by collecting samples exceeding the reference particle size, for example, more than 3 mm (S450). Thereafter, it is determined how much the ratio of the second weight to the measured first weight is (S460). For example, it may be determined whether the second weight of the sample larger than 3 mm is less than 18 ± 2 wt% of the first weight. At this time, the sample which is 3 mm or less becomes 82 +/- 2 weight%. Therefore, it is possible to determine whether the content of coal satisfying the reference particle size (3 mm) satisfies the reference content (82 ± 2% by weight). When the second weight of the sample is not less than 18 ± 2% by weight, the coal is crushed by adjusting the distance between the hammer and the backplate of the coal crusher (S310). As an example of adjusting the gap between the hammer and the crushing plate, when the content of coal having a reference particle size is less than the reference content, the gap between the hammer and the crushing plate may be approached. If the second weight of the sample is less than 18 ± 2% by weight, since the coal having a reference particle size is greater than the reference content, the coal crushing apparatus may not be readjusted.

Instead of determining how much the ratio of the second weight to the first weight is (S460), as shown in FIG. 6, an average particle size of the samples exceeding the reference particle size is measured (S450) and measured. Comparing the average particle size with the standard particle size (S460 ′) may be performed. At this time, when the particle size of the samples exceeding the reference particle size is matched within ± 1% of the reference particle size, the crushing operation is performed without adjusting the gap between the hammer and the rebound plate of the coal crushing device, the sample exceeding the standard particle size When the particle size of these particles is separated by more than ± 1% of the standard particle size, the crushing may be performed by adjusting the distance between the hammer and the repellent plate of the coal crushing device by about 15 mm.

Adjusting the distance between the hammer and the crushing plate of the coal crushing device is one easy example for adjusting the particle size of the coal to be crushed, and other crushed coal particle size adjusting means may also be reflected.

The crushed coal is transferred to a storage bin through a separate transport means such as a trip device, and the storage bin stores coal in a corresponding storage bin according to the type of coal (S700). At this time, it is determined whether the corresponding storage bin according to the type of coal (S500), by moving the trip device for transporting the crushed coal to the storage bin (S600) to store the coal.

The coal crushing method according to the third embodiment of the present invention combines the first and second embodiments of the present invention as described above, and in the third embodiment also reduces particle size variation due to over- or crushed. It is possible to more easily satisfy the target content of coal having a target particle size.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

1 is a flow chart showing a conventional coal crushing method,

2 is a view schematically showing a general coke manufacturing process,

3 is a cross-sectional view showing the internal structure of a general coal crushing device,

4 is a flow chart showing a coal crushing method according to a first embodiment of the present invention,

5 is a flow chart showing a coal crushing method according to a second embodiment of the present invention,

6 is a flow chart showing a modification of FIG.

7 is a flowchart showing a coal crushing method according to a third embodiment of the present invention.

Claims (7)

Discharging the unloaded coal; Storing data of the coal discharged; Crushing coal by adjusting a distance between the hammer and the crushing plate of the coal crushing device based on the discharged coal data; And Storing the crushed coal in a corresponding storage bin in accordance with the data of the discharged coal; Coal crushing method comprising a. The coal crushing method of claim 1, wherein the discharged coal data includes fine coal content data of the coal. The method of claim 1, after the crushing coal, Determining whether a content of coal having a target particle size of the crushed coal has reached a target value; And Adjusting a distance between the hammer of the coal crushing device and the rebound plate when the target value is not reached; Coal crushing method comprising a. The coal crushing method according to claim 3, wherein the step of determining the crushed coal is a step of determining whether 82 ± 2 wt% or more of coal having an average particle size of 3 mm or less is contained. The method of claim 3, wherein the determining of whether the target value has been reached comprises: Taking a sample of the crushed coal; Drying the sample; Measuring the weight of the dried sample; Determining whether the sample has a particle size of 3 mm or less; Measuring the weight of the sample of greater than 3 mm particle size and comparing it with the weight of the dried sample; And Determining whether a sample of greater than 3 mm particle size of said dried sample is less than 18 ± 2 weight percent; Coal crushing method comprising a. Discharging the unloaded coal; Crushing the discharged coal; Determining whether a content of coal having a target particle size of the crushed coal has reached a target value; Adjusting a distance between the hammer of the coal crushing device and the rebound plate when the target value is not reached; And Storing the crushed coal in a corresponding storage bin; Coal crushing method comprising a. The coal crushing method according to claim 6, wherein the determining of the crushed coal is a step of determining whether 82 ± 2 wt% or more of coal having an average particle size of 3 mm or less is contained.

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