JPS5953589A - Manufacture of compression-formed coal - Google Patents

Abstract

PURPOSE:To continuously produce titled coal suitable for block-charging, by first charging a feedstock coal with the previously-formed coal remaining in the opening zone of the mold to carry out a compression to integrate both coals, followed by extruding the front portion of the previously-formed coal out of the mold. CONSTITUTION:The previously-formed coal 12 is left to remain in the opening zone of the mold 11 with the opening located at the end of pressure-applying direction. A feedstock coal 6 is then charged between the above coal 12 and press plate 2 to carry out a compression by applying pressure through the plate 2 to integrate the newly-formed coal and previously-formed one, followed by applying pressure through the plate 2 to the resulting integrated coal to extrude the front portion of the previously-formed coal 12 through the opening outlet. By repeating a sequence of the procedures described above, a compression- formed coal 12' of desired size can be produced. By repeating the above operation, the objective compression-formed coal of any size readily separable block- by-block will continuously be manufactured in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing compression molded coal with a large bulk density, and particularly a method for producing compacted coal of any size with a bulk density of 1.0 wet tons/m2 or more in a continuous state. This will improve coke strength, expand the range of coking coal selection, and improve productivity.
This paper proposes a method for producing compression-molded coal for charging into furnace blocks, which is advantageous in eliminating furnace work and dust pollution.

Conventionally, the top-charging method has been widely adopted as a coking coal charging method in Japan, in which bulk materials are dropped into each kiln through a charging car through a charging hole at the top. Recently, a method of partially charging briquette coal has been developed that aims to improve coke strength by increasing the bulk density of the top-charged coking coal. This conventional method is a method in which raw coal is previously formed into a briquette shape using a double roll forming machine, and the bulk density is increased by approximately 10% by mixing in an amount of charge coal equivalent to approximately 30% of the briquette shape. However, even though this method increases the bulk density, the value is at most about 0.78 dry tons/m3, and the bulk density required by the present invention is 1.0 dry tons/m3 (water content 9%).
However, compared to 0.91 dry tons/m3) or more, this is quite low, which is insufficient for block charging.

As this type of conventional technology, for example, Japanese Patent Application Laid-open No. 50-594
A molding device proposed as No. 04 uses a mold with a bottom plate and pressurizes it with a press.

In this prior art device, it is necessary to prepare a mold and a press device that match the size of the compacted coal. Moreover, the stroke of the hydraulic cylinder becomes long, and the pressurized area is large, and the mold as a whole is required to be strong enough to withstand the pressure, making the molding equipment too large and leading to increased costs. Ta. In addition, this conventional apparatus requires a dedicated process for taking out the compacted charcoal from the mold, which has the disadvantage that the molding process takes a long time.

The present invention allows compressed briquette coal to be charged into blocks to be left in a part of the compressed briquette coal that has already finished compression molding at the exit of the mold, and at the same time to fill the remaining space inside the mold. The following compression molded coal obtained by newly charging coking coal and compression molding is combined with the tail end of the previously molded already compressed molded coal to form a bulk density of 1.0 wet tons/m3 or more. This is a method of obtaining compression briquettes by repeatedly extruding charcoal in sequence, and especially in such a continuous process, the compression briquettes reach a desired length. By using a partition plate when the partition plate is inserted, the compression molded coal is separated only at the part where the partition plate is inserted, and is continuous without coalescing; that is, it can be of any size (for the kiln for charging blocks) The preferred method is to produce it continuously by extruding it intermittently as compacted charcoal (up to size). The details of the configuration will be explained below.

The basic concept of the present invention is that when molding, if a partition plate is inserted into powdered coking coal and compression molded to a bulk density of 1.0 wet tons/m3 or more, the end face of the compression-molded coal containing the partition plate becomes the raw material. The purpose of this method is to take advantage of the phenomenon that since the charcoal particles are rearranged along the surface, they do not coalesce even if the two end surfaces are brought into contact with each other under pressure.

Normally, when powdered raw coal in a mold is pressurized, frictional force is generated on the wall of the mold. This is the same when extruding compressed briquettes from a mold that has already been molded; during extrusion, pressure must be applied that exceeds the frictional resistance of the charcoal itself.

Therefore, if some of the compression briquettes formed in the mold are left in the mold, for example, by appropriately selecting the size (layer thickness) of the compression briquettes to be left, it is possible to charge the compression briquettes. A frictional force is generated between the new raw material and the tail end surface of the compressed coal remaining in the mold to withstand the pressure applied when the next compressed coal to be tracked and combined is connected and molded. Therefore, coking coal is newly injected into the mold space created between the press plate and the tail end face of the compressed coal that has been formed in advance, and the press plate is pushed forward from one side of the charging side to perform compression molding. For example, even if there is no fixed wall at the other end on the pressing direction side, the tail end surface of the pre-compressed and formed coal will act as a fixed wall instead, making it possible to form the trailing compression-molded coal that is subsequently formed. Become,
Furthermore, it is possible to produce a product having a bulk density of 1.10 wet tons/m3 or more. Then, by applying even greater pressure, the compressed briquette remaining in the mold after being previously molded can be extruded out of the mold. In short, by repeating such operations, compression molded coal of any size can be continuously produced.

Furthermore, in the present invention, when the compression molded coal of the subsequent molding to be tracked and combined with the previously molded compressed molded coal has a desired length, a partition plate is inserted, and then it is inserted into the mold in the same manner as described above. If coking coal is charged and the push plate is pushed forward in the same way to pressurize the newly charged raw material, the coking coal particles will rearrange neatly along the surface of the partition plate, so even if the partition plate is subsequently removed. Also, even if the previously formed compacted coal is joined with the subsequent compacted coal, it will not coalesce.

Therefore, it becomes possible to continuously extrude briquettes of desired size out of the mold one after another while keeping them in a row.

In addition, methods for increasing the bulk density when compressing coking coal by inserting partition plates to divide the size of briquette coal into desired sizes include increasing the pressing force, charging raw coal, etc. There are methods of reducing the layer thickness by reducing the amount, or a combination thereof, and by using these methods, it is possible to achieve a high density of 1.20 wet tons/m@3 or more as required.

As mentioned above, the partition plate that essentially determines the size of the compression molded coal can be used as a reaction force receiving plate when pressurizing raw coal and removed after pressurization. The partition plate may be left as it is between the compressed coal and the subsequent compression molded coal that is to be followed by the preceding molded coal. The latter method includes a method of setting the partition plate using a push plate or a method of setting the partition plate from above or from the side of the mold. As the material, iron plates, wooden plates, paper plates, plastic plates, stone plates, etc. can be used, but there are no restrictions on the material or thickness.

In the block charging method, in which the compacted coal of a predetermined size obtained as described above is charged from the door side of the chamber furnace, the bulk density of the compacted coal must be at least 1.0 wet tons/m3. Otherwise, it may be damaged during charging, making it impossible to charge it smoothly into the furnace. If this is not achieved, in the worst case, the door will not be able to be installed and will collapse, or the compressed coal will continue to ignite, causing operational trouble.

For this reason, the bulk density of the compression molded coal needs to be 1.0 wet tons/m3 or more, preferably 1.15 wet tons/m3 or more. Therefore, in the present invention, the pressure for compressing the charging raw coal by pushing the push plate is adjusted so that the raw coal compressed by the pressurization becomes molded coal with a bulk density of 1.0 wet tons/m3. Make it the size necessary.

In addition, for this purpose, the size of the compressed briquette coal that is partially left in the mold must be such that it can provide a frictional resistance that can withstand the above-mentioned pressing force.

That is, when granular raw coal is pressurized at a pressure Pt/cm2, a pressure Pst/cm2 is generated on the wall surface of the mold, and a frictional force μPst/cm2 (μ: coefficient of friction) is generated. 1st
The figure shows the relationship between the pressure P and the frictional force μPs at a minute layer thickness dH. Since the weight of coking coal is small compared to its pressure,
If ignored, the frictional force μPs becomes the pressure P, as shown in equation (1).
It is understood as a function of the layer thickness H of the raw coal, the pressurized area F, and the circumferential length U of the mold.

μPs=f(P, H, F, U) (1) Once the target furnace to which the blocks are to be charged is determined, the circumferential length U and pressurizing area F of the mold are determined from the furnace dimensions. The compression-molded coal at the layer thickness H has a frictional force μPs against the upward pressure,
In short, this frictional force μPs determines the supporting force of the residual compressed coal within the mold. Therefore, when the pressure P and layer thickness H are given as described above, until the frictional force μPs is determined, the amount of pre-produced compacted coal that should remain, that is, the size, can be determined by equation (1). can. According to experience, the pressure of the press plate required to obtain compacted coal with a bulk density of 1.0 wet tons/m3 in a mold of 350 mm x 1000 mm is about 50 kg/m3. Then, the pre-compressed and molded coal produced in advance with a bulk density of 1.0 wet tons/m3 or more is left at the outlet of the mold, and the raw coal is newly added to the press plate in the mold and the pre-compressed molded coal. When charging and pressurizing the raw coal between the coal and the coal, the previously generated compacted coal remaining in the mold functions as a supporting force when compressing the newly charged raw material coal, The newly charged coking coal is compressed to the maximum due to the frictional resistance immediately before and after extrusion. In this way, compression molding with a bulk density of 1.0 wet tons/m3 can be achieved by appropriately selecting the layer thickness of the previously produced compacted coal to be retained and the amount of newly charged coking coal: that is, the layer thickness. The pressure required to form charcoal (50
kg/cm2), preferably bulk density 1.15 wet tons/m
Pressure required to obtain compression molded coal (100 kg/c
m2) can be added to the push plate.

When pressurization is continued at a pressure P that exceeds the balance with the frictional force μPs, the compressed molten coal generated in the mold can be pushed out of the mold, and by these sequential operations, endless compression molten coal is produced. can be manufactured. By configuring as described above, the mold only needs to correspond to the minimum size of the charging block, so it can be made economical and easy to handle, especially in the case of the preferred example shown. In the case where the pressurizing direction is horizontal, the pressurizing area is minimized, so the molding device can be made most compact and exhibits excellent economic efficiency. The pressing direction may be any direction, including vertical, horizontal, and diagonal directions.

In addition, in the case of the present invention, by inserting a partition plate and compressing, it is possible to continuously compress and mold coal of a desired size in the same process, and of course, the cutting process is not necessary. Furthermore, the physical strength of the part to be compressed by inserting the partition plate, that is, the tip of the compacted coal, can be greatly improved.

FIG. 2 shown in the drawings shows one example of a typical manufacturing method of the present invention using a horizontal device. Stage (a) shows the stage in which the previously produced compressed briquette coal is left on the exit side of the mold, and raw coal is charged into the space behind it. The figure shown in (b) shows the compressed coking coal that has been compressed by the advancement of the push plate, and the previously produced compressed briquette coal, which is then pressurized to produce new compressed briquette coal (
This is the stage of tracking and combining the tracking briquette coal. moreover,(
The diagram shown in c) shows the step in which a pressure that exceeds the frictional resistance of the compressed molten coal and the tracked molten coal is applied to push the press plate forward to force the compressed molten coal out of the mold. By the operation at this stage, the compressed briquette coal is pushed out of the mold, and the newly generated tracking briquette coal moves to the exit side of the mold.

By repeating these steps, it is possible to produce compression-molded charcoal that can be endlessly shaped into any size, and in particular, the compression-molded charcoal has a length that is suitable for the chamber furnace to be placed in the kiln.

Examples of the present invention will be described below.

3 to 6 of the drawings schematically show the apparatus used in the manufacturing method of the present invention, and among the symbols shown in the drawings, 1 is a push plate drive device, 2 is a push plate, and 3 and 3' are get damper drive devices. ,
4, 4' are gate dampers, 5, 5' are raw coal hoppers, 6 is raw coal, 7, 7' are partition plates placed inside the mold, 8
10 is a drive device for the partition plate, 9 is a filling plate, 10 is a filling plate drive device, 11 is a mold, 12 is already compression molded, 12' is extruded compression molded coal, 13 is a case for compression molded coal, 14 is a Ground plate, 15 is a partition plate placed in the mold outlet, 16
17 indicates a driving device for the partition plate (15), and 17 indicates a receiving device for the partition plate (15).

Example 1 The steps (a), (b), and (c) shown in FIG. That is, as shown in FIGS. 3 and 4, a part of the compressed molten coal 12 pushed out of the mold is placed on the ground plate 14 outside the mold, and the rest is stored in the mold 11. The preceding compression molded coal 12′ obtained in this way
When the integrated compressed briquette coal 12 reaches a desired length, a partition plate 7 is inserted at the boundary as shown in FIG. 7 instead of step (b) in FIG. 2 above. A process of compression molding is adopted.

In addition, in the steps (a), (b), and (c) shown in FIG. 2 until the desired size, that is, the specified size for block charging, the filling plate 9 and the partition plate 7 are It is set at the same level as the inner wall surface of the mold 11, but in the process where it is necessary to insert and separate the partition plate 7, the filling plate 9 is moved back and the partition plate 7 is moved forward and crosses the inside of the mold. Then, charge the filling plate 9 into the place where it has retreated.

Next, the gate damper 4 is opened and new raw coal 6 is filled between the partition plate 7 and the push plate 2, and then the gate damper 4 is closed. A side view of the process in the above state is shown in Figure 3.
Further, the plane 14 at that time is shown in FIG.

(A) in Fig. 1 shows a state in which the partition plate 7 is inserted and pressure is applied to the pusher plate 2 to compress it and mold the tracking briquette coal.
B) shows a situation in which the partition plate 7 is removed and the tracking briquette coal is in adjacent contact with the compressed briquette coal in a state where it is directly separated without being combined with the compressed briquette coal.

(c) in Fig. 7 is the operation of the step (c) shown in Fig. 2;
The compressed molten coal is pushed out of the mold, and the compressed molten coal is placed on the ground plate 14 to form the compressed molten coal case 13.
The figure shows a state in which the tracking briquette coal is left inside the mold 11. Continue repeating the process explained above,
Produces compacted coal of any size suitable for block charging.

Figure 8 (a) shows a case in which two pieces of compressed product charcoal 12, 12', which are in contact with each other at an arbitrary length and are not combined, are stored in the case 18 in a continuous state. . Although these compacted coals 12 and 12' are in contact with each other, they are not combined and can be easily separated.

Compressed briquettes that are slightly shorter than the length of the chamber furnace are produced and stored in a ground plate 14 and case 18 corresponding to the length, and the case 13 is moved to separate the compression briquettes 12 and 12'. It is shown in Figure 8 (b).

In the manner described above, it is possible to continuously produce uncoalesced compacted coal of any length.

Example 2 In the same process as in Example 1, when the compressed briquette 12' reaches a desired length, a partition plate 7' is inserted and new raw coal is added, as shown in FIG. 6 is charged, the partition plate 7' remains in the mold 11, pressure is applied to the press plate 2, and the press plate 2 is compressed, and the same process as in Example 1 is repeated and continued to produce a product. Since the partition plate 7' does not combine with the compacted charcoal, the compacted charcoal of this embodiment can be easily separated into compacted charcoal of arbitrary length.

Example 3 In the same process as in Example 1, when the compressed briquette 12' reaches a desired length, the compression briquette 12,
12' is all extruded out of the mold 11, and then the mold 1
Another partition plate 15 is set at the outlet of 1 as shown in Figs. 5 and 6, and fresh raw coal is charged from the raw material hopper 5' and compressed to form compressed briquette coal. generate. Partition plate l5
After leaving it set or removing it, raw coal 6 is newly charged from the raw material hopper 5 and compressed. In the former case,
After removing the partition plate 15, the same process is repeated.

Note that the pressing force for compressing the raw coal 6 with the press plate 2 is the same as that of the partition plate 1.
5 and is received by a receiving mounting 17.

As explained above, according to the present invention, compression briquettes of any length can be automatically produced, so even though continuous production equipment is used, there is no need for a briquette cutting process. be. In this sense, the present invention provides remarkable effects when compressed coal is divided and charged into a chamber furnace. In addition, it is desirable that the outer shell of compression-molded coal has high physical strength to withstand collapse, etc., but since partition plates are used, the strength of the surface to be compressed becomes particularly large, and this increases as the pressing force increases. For example, the bulk density can be increased to 1.20 wet tons/m3 or more, and the physical strength of the compacted coal can be significantly improved.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the relationship between pressure and frictional force, and Figure 2 is a cross-sectional view showing the compression molding process, where (a) shows the initial state of pressurization, and (b) shows the preliminary molding process. Figure 3 is a process diagram showing the state in which the tracking briquette coal that was molded following the compressed briquette coal is pushed out, and the tracking briquette replaces it and moves to the outlet side of the mold. FIG. 4 is a horizontal sectional view showing a molding case using a filling plate and a partition plate; FIGS. 5 and 6 show another embodiment of the present invention. Vertical sectional view/horizontal sectional view, (A) to (C) in FIG. 7 are process diagrams of the embodiment of the present invention corresponding to FIGS. 8 and 4, (A) and (B) in FIG. Both are plan views showing a case in which compression molded coal is stored in a case, and FIG. 9 is a cross-sectional view of an embodiment in which molding is performed sequentially with partition plates inserted. 1... Push plate drive device, 2... Push plate, 3, 3'...
Gate damper drive device, 4, 4'... Gate damper, 5, 5'... Coking coal hopper, 6... Coking coal,
7, 7'... Partition plate placed inside the mold, 8... Drive device for partition plate (7), 9... Filling plate, 10... Filling plate drive device, 11... Gold Mold, 12... Compressed briquette coal, 12'... Extruded compression briquette coal, 13... Compression briquette case, 14... Ground plate, l5
...Partition plate inserted into the mold outlet, 16...Partition plate (l
5) Drive device, 17... partition plate (15) receiving device.

Claims (2)

[Claims] 1. In a method of obtaining compression molded coal by charging raw coal into a mold and pressurizing it with a push plate, the raw material is charged into a mold with an open end in the pressure direction, and the press plate is pushed forward. In molding the compression molded coal in the mold and further pushing it out from the opening outlet in the direction of pressurization, (a) a step of leaving the previously molded compressed molded coal at the mold outlet; (b) A step of newly charging raw coal between the compression molded coal and the press plate, compressing it by applying pressure to the press plate, and combining the tracked molded coal to be generated subsequently with the already compressed molded coal. (c) Obtaining compression molded coal of a desired size by repeating the sequential operation of applying pressure to the combined compression molded coal on a push plate and pushing the preceding portion of the compressed molded coal out of the mold; (d) After that, a part of the compression molded coal that has reached the desired size is pressed against the tail end face of the compression molded coal, which remains in the mold, with a partition plate that is to be removed or left as it is, and pressed against the partition plate. For each block, by repeating the sequential operation consisting of the steps of charging new raw coal between the plate and pushing the plate to pressurize and compress it to obtain compacted coal of the desired size again. A method for producing compression-molded coal, which comprises continuously molding and manufacturing compression-molded coal of any size that can be immediately separated. 2. In a method of obtaining compression molded coal by charging raw coal into a mold and pressurizing it with a push plate, the raw material is charged into a mold with an open end in the pressure direction, and the press plate is pushed forward. In molding the compression molded coal in the mold and further pushing it out from the opening outlet in the direction of pressurization, (a) a step of leaving the previously molded compressed molded coal at the mold outlet; (b) New raw coal is charged between the compressed formed coal and the push plate, pressure is applied to the push plate to compress it, and the tracked formed coal to be generated subsequently is combined with the already compressed formed coal. (c) Obtaining compression molded coal of a desired size by repeating the sequential operation of applying pressure to the combined compression molded coal on a push plate and pushing out the preceding portion of the compressed molded coal out of the mold. (d) After that, the compression molded coal obtained in the step (c) above that has reached the desired size is once pushed out of the mold, and a partition plate is removably set at the exit end of the mold. , go through the steps (a) to (c) above again, and then mold the next compression molded coal.By repeating the sequential operations, compressed molded coal of any size that can be immediately separated into blocks can be continuously produced. A method for producing compression briquettes characterized by forming and producing charcoal in a continuous state.