JP7415845B2 - Ash processing method - Google Patents

Description

The present invention relates to an ash disposal method.

2. Description of the Related Art Conventionally, there has been known a treatment method in which waste such as coal ash is put into a storage section where water is stored. For example, Patent Documents 1 to 3 describe this type of technology. Patent Document 1 describes a method in which coal ash slurry is caused to flow out from a slurry outlet into a recess, and a part of the flowed out coal ash slurry is allowed to flow along the groove, and the coal ash is allowed to settle within the groove. . Patent Document 2 describes that the interior of a landfill is divided into a plurality of sections, and waste including organic waste is dumped into each section. Patent Document 3 describes that incineration bottom ash is classified into those with large particle sizes and those with small particle sizes, and these are individually landfilled.

JP2019-118865A JP 60-112908 Publication Japanese Patent Application Publication No. 2002-79207

Incidentally, coal ash includes clinker, which has a relatively large particle size and easily accumulates, and fly ash, which has a small particle size and easily floats in water. In the ash processing method described in Patent Document 1, coal ash is allowed to flow into the storage section without changing the position of the slurry outlet, so coal ash is not dispersed far away and tends to accumulate around the slurry outlet. Ta. On the other hand, in the ash disposal method described in Patent Document 2, each field is reclaimed in order from the one closest to the land, but this method is an improvement over the landfilling of fly ash, which floats in water and is easily dispersed over long distances. There was room. In Patent Document 3, coal ash particles with large particle sizes and those with small particle sizes are treated in separate landfill sections, but the two landfill sections are separated. The conventional technology has room for improvement in terms of efficiently and uniformly filling clinker and fly ash into storage areas.

An object of the present invention is to provide an ash processing method that can efficiently and uniformly bury coal ash in a storage section.

The present invention provides an ash processing method in which coal ash is processed in a storage section where water is stored, and the storage section is divided into a first partition area where clinker of coal ash is processed and a second partition area where fly ash of coal ash is processed. a step of dividing the first divided region into two divided regions; and a step of reclaiming clinker for each of a plurality of regions formed between one bank of the first divided region and the other bank of the first divided region; A clinker transfer step in which clinker is sent from an area on one side, the area is reclaimed with coal ash, and then the clinker is started to be transferred to an area adjacent to the other side; A fly ash transfer step for sending fly ash.

After depositing the coal ash in the storage part to a predetermined height, the method further includes a post-treatment step of forming a plant growth layer containing seeds and growing plants on the coal ash.

The plant growth layer is a net-like member with seeds on it.

In the partitioning step, a partition wall is formed to partition the plurality of areas formed between the one bank and the other bank of the first partition area.

According to the present invention, it is an object of the present invention to provide an ash processing method that can efficiently and uniformly fill up coal ash in a storage section.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the ash processing equipment in which the ash processing method of one Embodiment of this invention is used. FIG. 2 is a side view showing how coal ash in a first partitioned area of the storage section is processed by the ash processing method according to the embodiment of the present invention. FIG. 3 is a side view showing how coal ash in a second partitioned area of the storage section is processed by the ash processing method according to the embodiment of the present invention. It is a top view which shows the 1st division area of the ash processing equipment in which the ash processing method based on the modification of this invention is used.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

The ash processing method according to this embodiment is a method for processing coal ash 6 generated from a coal-fired power plant or the like. First, an ash processing facility 1 in which the ash processing method according to the present embodiment is used will be described with reference to FIG. 1. FIG. 1 is a plan view of the ash processing equipment 1.

Coal ash 6 is mainly divided into clinker 61 and fly ash 62. Clinker 61 is lumpy ash that has fallen to the bottom of a boiler in a coal-fired power plant. Fly ash 62 is fine particles that are blown up together with combustion gas in a coal-fired power plant and collected by an electrostatic precipitator or the like. The fly ash 62 has a smaller particle size than the clinker 61, and is generated in a larger amount than the clinker 61.

As shown in FIG. 1, the ash processing equipment 1 includes a storage section 10, a transfer pipe 20, and a partition wall 30 that partitions the storage section 10.

The storage section 10 is an area into which coal ash 6 is filled and reclaimed. Water is stored in the storage section 10 to prevent the coal ash 6 from scattering. The storage unit 10 of this embodiment is a part of the sea or lake surrounded by the land 2 and the embankments 3, 4, and 5. The land 2 is a bank on one side (the left side in FIG. 1) of the storage section 10, and the embankment 3 is the bank on the other side (the right side in FIG. 1) opposite the land 2. The embankments 4 and 5 are embankments extending between the land 2 and the embankment 3. A supply source (not shown) for coal ash 6 is provided on one side of the land 2.

The storage unit 10 is partitioned into a first partition area 11 and a second partition area 12 by a partition wall 30 . The partition wall 30 is formed between the embankment 4 and the embankment 5 in plan view, and extends between the land 2 and the embankment 3 of the storage section 10. The partition wall 30 is formed to stand up from the bottom of the storage section 10.

The material of the partition wall 30 is not particularly limited. For example, the partition wall 30 according to this embodiment is made of a mixture of clinker 61 and a solidifying material such as cement. Since the partition wall 30 is provided using the clinker 61 to be treated, it is possible to suppress an increase in material costs for forming the partition wall 30.

As shown in FIG. 1, the first partitioned area 11 is an area surrounded by the land 2, the embankments 3 and 4, and the partition wall 30. In the first divided area 11, clinker 61 of coal ash 6 is processed. In the ash processing method according to the present embodiment, clinker 61 is reclaimed in each of the three regions 111, 112, and 113 in the first divided region. Region 111 is adjacent to land 2 in first divided region 11, region 113 is adjacent to embankment 3, and region 112 is located between region 111 and region 113.

As shown in FIG. 1, the second partition area 12 is an area surrounded by the land 2, the embankments 3 and 5, and the partition wall 30. In the second divided area 12, fly ash 62 of coal ash 6 is processed. In this embodiment, since the amount of fly ash 62 generated from the thermal power plant is larger than that of clinker 61, the second partitioned area 12 is partitioned so as to have a larger volume than the first partitioned area 11. .

It is preferable that the storage unit 10 is provided with a water level adjustment unit 80 that adjusts the water level in the first partitioned area 11 . In this embodiment, as shown in FIG. 1, two water level adjustment parts 80 for adjusting the water level in the first partitioned area 11 are provided near the partition wall 30 in the first partitioned area 11. The water level adjustment part 80 is formed into a rectangular cylindrical shape as a whole, and four side walls are erected so as to be orthogonal to the bottom of the storage part 10. One of the four side walls is a side wall 81 whose height is adjustable. The side wall 81 is formed by a plurality of corner cutting materials. Specifically, the side wall 81 is formed by inserting a plurality of corner cutting materials into a guide groove (not shown) of the water level adjustment part 80. The height of the side wall 81 changes depending on the number of corner cutters inserted into the guide groove.

The water level adjustment unit 80 includes a pipe 82 that extends from the side wall opposite to the side wall 81 to the lower part of the partition wall 30 and extends toward the second partition area 12 side. The inside of the water level adjustment part 80 and the second division area 12 communicate with each other through the pipe 82 . The pipe 82 extends from the first partitioned area 11 side to the second partitioned area 12 side so as to form a downward slope.

The transfer pipes 20 are two pipes for transferring the coal ash 6 from the supply source of the coal ash 6 to the storage section 10. The transfer pipe 20 includes a clinker transfer pipe 21 and a fly ash transfer pipe 22.

The clinker transfer pipe 21 is provided above the first partitioned area 11 of the storage section 10 and extends from the land 2 on one side of the first partitioned area 11 toward the embankment 3 on the other side. The clinker 61 of the coal ash 6 flows in the clinker transfer pipe 21 in a slurry state mixed with water, and is sent to the first division area 11 from the outlet 211 provided at the tip of the clinker transfer pipe 21. In a state before the processing of coal ash 6 to storage unit 10 is started, outlet 211 is located above region 111 adjacent to land 2 in first divided region 11 .

The fly ash transfer pipe 22 is provided above the second partitioned area 12 of the storage section 10 and extends from the land 2 on one side of the second partitioned area 12 toward the embankment 3 on the other side. The fly ash 62 of the coal ash 6 flows in the fly ash transfer pipe 22 in the form of a slurry mixed with water, and is sent to the second compartment area 12 from the outlet 221 provided at the tip of the fly ash transfer pipe 22. The outlet 221 of the fly ash transfer pipe 22 is located near the center of the second divided region 12 in plan view.

Next, the ash processing method according to this embodiment will be described with reference to FIGS. 1 to 3. 2(A) is a diagram showing how the clinker 61 is sent to the area 111 adjacent to the land 2 of the first divided area 11, and FIG. 2(B) is a diagram showing how the clinker 61 is sent to the area 112 located near the center of the first divided area 11. FIG. 2C is a diagram showing how the clinker 61 is sent to the area 113 adjacent to the embankment 3 of the first divided area 11. FIG. 3(A) is a diagram showing how the fly ash 62 is sent to the second divided area 12, and FIG. 3(B) is a diagram showing a state in which the filling of the second divided area 12 is completed.

The ash processing method according to the present embodiment includes a partitioning step of partitioning the storage section 10 into a first partitioning region 11 and a second partitioning region 12, a clinker transfer step of sending the clinker 61 to the first partitioning region 11, and a clinker transfer step of sending the clinker 61 to the first partitioning region 11. A fly ash transfer process in which fly ash 62 is sent to area 12 and coal ash 6 is deposited in each of areas 111, 112, 113 of first partition area 11 of storage section 10 and coal ash is transferred to second partition area 12. 6 is deposited, and a post-treatment step of forming a plant growth layer 70 containing seeds and in which plants grow.

In the partitioning step, the storage section 10 is partitioned into a first partition area 11 where clinker 61 is processed and a second partition area 12 where fly ash 62 is processed. Specifically, as shown in FIG. 1, a partition wall 30 is formed extending between the land 2 and the levee 3 so that two areas are partitioned between the levee 4 and the levee 5 of the storage section 10. As described above, the partition wall 30 is formed by mixing clinker 61 and a solidifying material such as cement. It is preferable that the partition wall 30 is formed in a semi-aridland part (the beach) of the storage part 10. When forming the partition wall 30 at a deep position in the water, it is preferable to form the partition wall 30 using sheet piles.

As shown in FIG. 1, in this embodiment, two water level adjustment parts 80 are provided near the partition wall 30 in the first partition area 11.

After the partition wall 30 and the water level adjustment part 80 are provided, water is sent to the first partition area 11. When the water sent to the first divided area 11 exceeds the side wall 81 of the water level adjustment part 80, the water flows into the second divided area 12 via the piping 82. When the water level in the second divided area 12 is lower than the water level in the first divided area 11, the water level in the first divided area 11 does not exceed the height of the side wall 81. That is, the water level in the first partitioned area 11 can be adjusted by inserting and removing the corner cutting material into and from the guide groove of the water level adjustment section 80.

In the clinker transfer process, the clinker 61 is sent to the first divided area 11 where water is stored, and the clinker 61 is sent to each of the plurality of areas 111, 112, 113 formed between the land 2 and the embankment 3 in the first divided area 11. landfill. Details of the clinker transfer process will be explained with reference to FIGS. 2(A) to 2(C).

First, as shown in FIG. 2A, slurry-like clinker 61 is sent to the region 111 from the outlet 211 of the clinker transfer pipe 21 located above the region 111 of the first divided region 11. At this time, the clinker 61 is deposited while leveling it with a heavy machine so that the clinker 61 is not exposed from the water surface of the first divided area 11 and scattered. Land 2 will serve as a scaffold for carrying out work with heavy equipment.

As shown in FIG. 2B, after the clinker 61 is deposited to a predetermined height in the region 111, a post-processing step is performed, and the reclamation of the region 111 is completed. In the post-treatment step, a plant growth layer 70 is formed on the clinker 61 deposited in the region 111 so that the clinker 61 is not scattered.

As shown in FIG. 2(B), after the area 111 is filled with clinker 61, the clinker transfer pipe 21 is extended so that the outlet 211 of the clinker transfer pipe 21 is located above the area 112. Then, slurry-like clinker 61 is sent from the delivery port 211 to the region 112 . At this time, the clinker 61 is deposited while leveling it with a heavy machine so that the clinker 61 is not exposed from the water surface of the first divided area 11 and scattered. The area 111 reclaimed with clinker 61 becomes a scaffold for work with heavy machinery.

As shown in FIG. 2C, after the clinker 61 is deposited to a predetermined height in the region 112, a post-processing step is performed to complete the reclamation of the region 112. That is, the plant growth layer 70 is formed on the clinker 61 deposited in the region 112 to prevent the clinker 61 from scattering.

As shown in FIG. 2C, after the area 112 is filled with clinker 61, the clinker transfer pipe 21 is extended so that the outlet 211 of the clinker transfer pipe 21 is located above the area 113. Then, the slurry-like clinker 61 is sent to the region 113 from the delivery port 211 . At this time, the clinker 61 is deposited while leveling it with a heavy machine so that the clinker 61 is not exposed from the water surface of the first divided area 11 and scattered. Areas 111 and 112 reclaimed with clinker 61 serve as scaffolding for work with heavy equipment.

After the clinker 61 is deposited to a predetermined height in the region 113, a plant growth layer 70 is formed on the clinker 61 deposited in the region 113, and the reclamation of the entire first divided region 11 is completed.

In the clinker transfer step according to the present embodiment, the clinker 61 that tends to accumulate is reclaimed from the region 111 on one side of the first divided region 11 to the region 113 on the other side in each region 111, 112, and 113. Thereby, the area 111 reclaimed with clinker 61 can be used as a scaffold, and heavy machinery can be used for the reclamation work of the adjacent area 112. For example, even if the clinker 61 accumulates unevenly in the region 112 near the bottom of the outlet 211, the clinker 61 can be leveled with heavy equipment. Therefore, the first divided area 11 can be efficiently filled with clinker 61 so that it is uniform.

In the fly ash transfer process, fly ash 62 is sent to the second divided area 12 where water is stored. Specifically, as shown in FIG. 3A, slurry-like fly ash 62 is transferred to the second partition area 12 from the outlet 221 of the fly ash transfer pipe 22 located above the center of the second partition area 12. Send it near the center of.

As shown in FIG. 3(A), the fly ash 62 sent from the fly ash transfer pipe 22 to the second compartment area 12 has a small particle size, so it floats in the water from near the center of the second compartment area 12. while being dispersed in all directions.

As shown in FIG. 3(B), after the fly ash 62 is deposited to a predetermined height in the second divided area 12, a post-processing step is performed, and the reclamation of the second divided area 12 is completed. That is, the plant growth layer 70 is formed on the second divided area 12 so that the fly ash 62 is not scattered. In the plant growth layer 70, the coal ash 6 deposited therebelow becomes fertilizer, seeds germinate, and plants grow. The plant growth layer 70 according to this embodiment is a net-like member with seeds, and is laid on the coal ash 6.

In the fly ash transfer process of this embodiment, the fly ash 62 is sent to the vicinity of the center of the second divided area 12. As a result, the fly ash 62 having a small particle size is dispersed from near the center of the second divided area to the entire area while floating in the water. Therefore, without changing the position where the fly ash 62 flows into the second divided area 12, it is possible to efficiently fill up the second divided area 12 with the fly ash 62 so that the second divided area 12 is uniform.

Moreover, it is preferable that the predetermined height at which the coal ash 6 is deposited in the clinker transfer process and the fly ash transfer process is approximately the same height as the partition wall 30. Thereby, the entire storage section 10 can be reclaimed more uniformly.

Next, an ash processing method according to a modification of the above embodiment will be described. FIG. 4 is a diagram showing a first divided area 11A of the ash processing equipment 1A in which the ash processing method according to the modification is used. Note that the same configurations as those in the above embodiment may be given the same reference numerals and the description thereof may be omitted.

The ash processing equipment 1A includes a storage section 10, a clinker transfer pipe 21, a fly ash transfer pipe 22, and a partition wall 30. The storage unit 10 is partitioned into a first partition area 11 and a second partition area 12 by a partition wall 30 . In this embodiment, the second partitioned area 12 is partitioned such that its volume is larger than that of the first partitioned area 11A.

The ash processing equipment 1A differs from the ash processing equipment 1 mainly in the configuration of the first partitioned area 11. In the ash processing equipment 1A, regions 111, 112, and 113 are formed between the land 2 and the embankment 3 in the first divided region 11A, similarly to the ash processing equipment 1. In the ash processing equipment 1A, partition walls 31, 32 are formed so that regions 111, 112, 113 are partitioned from each other. The partition walls 31 and 32 are formed to stand up from the bottom of the storage section 10.

As shown in FIG. 4, the partition walls 31 and 32 are formed at intervals so as to extend from the partition wall 30 to the embankment 4. Furthermore, the partition wall 31 is located on one side of the partition wall 32. The first partition area 11 is divided by the partition walls 31 and 32 into an area 111 formed between the land 2 and the partition wall 31, an area 112 formed between the partition walls 31 and 32, and a partition wall 32. It is divided into areas 113 formed between the embankments 3. Further, a water level adjustment section 80 is provided near the partition wall 30 in the region 111, the region 112, and the region 113.

The ash processing method of the modification differs from the ash processing method of the above embodiment in the partitioning step. That is, in the partitioning process of the modified example, the partition wall 30 for partitioning the storage section 10 into the first partition area 11 and the second partition area 12 is formed, and the partition wall 30 is formed from the land 2 of the first partition area 11 to the embankment 3. The partition walls 31, 32 are formed to partition the regions 111, 112, 113.

According to the ash processing method according to the embodiment described above, the following effects are achieved.

The ash processing method according to the embodiment of the present invention is an ash processing method in which coal ash 6 is processed in a storage section 10 where water is stored, and the storage section 10 is divided into a first section where clinker 61 of the coal ash 6 is processed. A partitioning process of partitioning the area 11 and the second partitioning area 12 where the fly ash 62 of the coal ash 6 is processed, and a plurality of partitions formed between the land 2 on one side of the first partitioning area 11 and the embankment 3 on the other side. This is a process of reclaiming clinker for each of the regions 111, 112, and 113, in which the clinker 61 is sent from the region 111 on one side of the first divided region 11, and after the region 111 is reclaimed with the clinker 61, the region adjacent to the other side is filled with clinker. 112; and a fly ash transport step, in which the fly ash 62 is sent to the vicinity of the center of the second divided region 12 in plan view.

As a result, clinker 61, which tends to accumulate, is reclaimed in order from the land 2 on one side of the first divided area 11 to the embankment 3 on the other side, and fly ash 62, which has a small particle size and tends to float in water, is buried in the second land. It is sent to the vicinity of the center of the divided area 12. Therefore, the land 2 of the first partitioned area 11 or the area where the reclamation has been completed can be used as a scaffold, and the clinker 61 that tends to accumulate can be leveled with heavy equipment and reclaimed. Further, fly ash 62, which is generated in a larger amount than clinker 61, is dispersed from near the center of the second division area to the entire area while floating in water. In this way, by reclaiming the coal ash 6 for one storage section 10 using a method suitable for the characteristics of each of the clinker 61 and the fly ash 62, the entire storage section 10 can be reclaimed efficiently and uniformly. can.

The ash processing method according to the embodiment of the present invention includes depositing coal ash 6 in the storage section 10 to a predetermined height, and then forming a plant growth layer 70 on the coal ash 6 that contains seeds and in which plants grow. The method further includes a processing step.

This prevents the coal ash 6 accumulated in the first divided area 11 and the second divided area 12 from scattering, and allows the accumulated coal ash 6 such as fly ash 62 to be effectively used as fertilizer for plants.

In the ash processing method according to the embodiment of the present invention, the plant growth layer 70 is a net-like member with seeds attached.

Thereby, the plant growth layer 70 can be formed by a simple method of laying a net-like member on the coal ash 6.

In the ash processing method according to the embodiment of the present invention, in the dividing step, a plurality of areas 111 to 113 formed between the land 2 on one side of the first divided area 11A and the embankment 3 on the other side are divided from each other. Form walls 31 and 32.

As a result, the areas 111 to 113 are divided by the partition walls 31 and 32, so that the area where the reclamation is completed can be made stronger, and the area becomes a more stable footing. Therefore, it is possible to perform the reclamation work on the area adjacent to the other side while leveling out the accumulated clinker 61 more safely.

Although the embodiments related to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.

In the above embodiments and modifications, the coal ash 6 is deposited to a predetermined height in the first divided area 11 and the second divided area 12, and then the plant growth layer 70 with plant seeds is deposited on the coal ash 6. However, the post-treatment process is not limited to this method. For example, the accumulated coal ash 6 may be covered with soil, or a solidified product of coal ash 6 may be spread over it.

In the above embodiment and modification, the first divided area 11 is divided into three areas 111, 112, 113 between the land 2 and the embankment 3, and the clinker 61 is reclaimed for each area 111, 112, 113, but it can be divided. The number of areas is not particularly limited. For example, the first divided area 11 may be divided into two areas and filled in for each area, or may be divided into four or more areas and filled in for each area.

In the above embodiments and modifications, the second partitioned area 12 is partitioned so as to have a larger volume than the first partitioned area 11, but the first partitioned area 11 and the second partitioned area 12 are approximately the same. It may be partitioned to have a volume, or it may be partitioned so that the first partitioned area 11 has a larger volume than the second partitioned area 12.

In the above embodiments and modified examples, a net-like member with seeds is used as the plant growth layer 70, but the structure of the plant growth layer 70 is not particularly limited. For example, it may be a sponge-like member with seeds attached.

In the above embodiments and modifications, the water level adjustment unit 80 that adjusts the water level in the first partitioned area 11 is provided, but the water level that adjusts the water level in the second partitioned area 12 is located near the partition wall 30 in the second partitioned area 12. An adjustment section may also be provided.

In the above embodiments and modified examples, the pipe 82 has a structure extending from the first partition area 11 side to the second partition area 12 side so as to form a downward slope, but from the second partition area 12 side to the first partition It may have a structure extending so as to form a downward slope toward the region 11 side, or may have a structure extending substantially horizontally.

1, 1A Ash processing equipment 2 Land (shore)
3 Embankment (shore)
6 Coal ash 10 Storage part 11 First compartment area 12 Second compartment area 61 Clinker 62 Fly ash

Claims (4)

An ash processing method for processing coal ash in a storage section where water is stored, the method comprising:
a partitioning step of partitioning the storage section into a first partition area where clinker of coal ash is processed and a second partition area where fly ash of coal ash is processed;
A step of reclaiming clinker for each of a plurality of areas formed between one bank of the first partitioned area and the other bank of the first partitioned area, the step of sending clinker from the area on one side of the first partitioned area, and a clinker transfer step, which starts transferring clinker to an adjacent area on the other side after filling the area with coal ash;
An ash processing method comprising: a fly ash transfer step of sending fly ash to near the center of the second divided area in a plan view. The ash processing method according to claim 1, further comprising a post-treatment step of forming a plant growth layer containing seeds and in which plants grow on the coal ash after depositing the coal ash to a predetermined height in the storage section. The ash processing method according to claim 2, wherein the plant growth layer is a net-like member with seeds attached. 4. In any one of claims 1 to 3, in the partitioning step, a partition wall is formed to partition the plurality of areas formed between the one bank and the other bank of the first partition area. Ash treatment method described.

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