JPS6218505B2 - - Google Patents
Info
- Publication number
- JPS6218505B2 JPS6218505B2 JP14971282A JP14971282A JPS6218505B2 JP S6218505 B2 JPS6218505 B2 JP S6218505B2 JP 14971282 A JP14971282 A JP 14971282A JP 14971282 A JP14971282 A JP 14971282A JP S6218505 B2 JPS6218505 B2 JP S6218505B2
- Authority
- JP
- Japan
- Prior art keywords
- pellets
- fired
- raw
- mixed
- firing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000008188 pellet Substances 0.000 claims description 84
- 238000010304 firing Methods 0.000 claims description 24
- 239000010883 coal ash Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 239000003245 coal Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 239000008187 granular material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Materials For Medical Uses (AREA)
- Processing Of Solid Wastes (AREA)
Description
【発明の詳細な説明】 本発明は人工細骨材の製造方法に関する。[Detailed description of the invention] The present invention relates to a method for producing artificial fine aggregate.
石油の供給不安と価格高騰により石炭の利用が
ますます拡大され、これに伴ない石炭灰の発生量
は急激に増加するものと予想される。従つて、こ
れに対処するため、特に、石炭火力発電所から大
量に発生する石炭灰を、エネルギーや副資材をで
きるだけ使用せずに、有効利用する技術の確立が
望まれている。近年、石炭灰を原料とした人工軽
量骨材の製造については種々検討されているが、
その大部分は粗骨材が対象であり、また移動火格
子式装置を用いた細骨材の製造方法についての報
告もないのが現状である。ところで、火格子式焼
成装置を用いて細骨材を製造する場合には、主と
して石炭灰中の未燃炭量及び焼成時の層内通気性
が問題となり、従来通りの焼成方法では焼成条件
を種々変化せしめた場合でも層内の通気が阻害さ
れるため、ペレツト同士が融着して、正常なペレ
ツトが得られないという欠点があつた。 The use of coal is expected to further expand due to uncertain oil supplies and soaring prices, and as a result, the amount of coal ash generated is expected to increase rapidly. Therefore, in order to deal with this problem, it is particularly desirable to establish a technology that effectively utilizes coal ash, which is generated in large quantities from coal-fired power plants, without using as much energy or auxiliary materials as possible. In recent years, various studies have been conducted on the production of artificial lightweight aggregates using coal ash as a raw material.
Most of these studies are aimed at coarse aggregates, and there are currently no reports on methods for producing fine aggregates using moving grate equipment. By the way, when producing fine aggregate using a grate-type firing device, the main problems are the amount of unburned coal in the coal ash and the air permeability in the layer during firing, and the conventional firing method requires various firing conditions. Even when the pellets are changed, the ventilation within the layer is inhibited, resulting in the pellets being fused together, resulting in a disadvantage that normal pellets cannot be obtained.
そこで本発明は上記欠点を解消し得る人工細骨
材の製造方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a method for producing artificial fine aggregate that can eliminate the above-mentioned drawbacks.
即ち、本発明は石炭灰を0.5〜5mm径の生ペレ
ツトに造粒し、この生ペレツトを火格子式焼成装
置により焼成して人工細骨材を製造する方法にお
いて、上記造粒後の生ペレツト中に、既に焼成さ
れた焼成ペレツトのうち粒径が上記生ペレツトと
ほぼ同じ大きさのものを添加混合し、この混合し
たものを火格式のパレツト上に供給して燃成す
る。ことを特徴とする人工骨材の製造方法であ
る。 That is, the present invention provides a method for producing artificial fine aggregate by granulating coal ash into raw pellets with a diameter of 0.5 to 5 mm, and firing the raw pellets using a grate-type firing device. Among the fired pellets that have already been fired, those having approximately the same particle size as the above-mentioned raw pellets are added and mixed, and the mixed pellet is fed onto a grate-type pallet and burned. This is a method for producing artificial aggregate characterized by the following.
かかる方法によると、焼成する前の生ペレツト
中に、既に焼成された焼成ペレツトのうち、生ペ
レツトとほぼ同じ大きさのものを添加混合するの
で、その焼成時に生ペレツト同士が融着するのを
防止できる。 According to this method, fired pellets that have already been fired and are approximately the same size as the raw pellets are added and mixed into the raw pellets before firing, thereby preventing the raw pellets from fusing together during firing. It can be prevented.
以下、本発明の一実施例を図面に基づき説明す
る。先ず、概略構成を説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings. First, the general configuration will be explained.
1は石炭灰を貯留する石炭灰槽、2は石炭灰槽
1から定量的に送り出された石炭灰を予湿して造
粒し易すくする加湿機、3は予湿された石炭灰を
0.5〜5mm径の生ペレツトに造粒する皿型若しく
はキルン型の造粒機、4は上記生ペレツトを焼成
する火格子式焼成装置で、造粒機3とはその途中
に生ペレツトと焼成ペレツトとの混合機5を有す
るペレツト供給ライン6によつて接続されてい
る。上記焼成装置4は、供給部aから排出部bに
向つて移動する無端状の火格子式パレツト7と、
このパレツト7上に載置された生ペレツトを乾燥
させる乾燥炉8と、この乾燥炉8によつて乾燥さ
せられたペレツトの表層部内の未燃炭に着火させ
る点火炉9と、パレツト7の移動経路下方に設け
られた複数個の風箱10と、これら風箱10を介
してペレツト内に大気を吸引通過させるための排
風機11,12とから構成され、また高温部風箱
10Aからの吸引排ガスは排風機12により乾燥
炉8に送られており、他の風箱10からの吸引排
ガスは集塵機13を介して排風機11により大気
に放出される。14は焼成装置4によつて焼成さ
れた焼成ペレツトのうち、粒径が5mm以上の粗い
不良分を取除く篩分機、15は篩分機14で不良
分が除去された製品細骨材のうち、一部分を取出
す第1分配シユート、16は第1分配シユート1
5によつて取出された焼成ペレツトをパレツト床
敷用として焼成装置4に送るための移送ラインで
ある。また、上記移送ライン16の途中には、第
2分配シユート17が設けられると共に、焼成ペ
レツトの一部が生ペレツト供給ライン6途中に設
けられた混合機5に供給されるようにしている。
なお、この混合機5において、0.5〜5mm径の生
ペレツト中に、生ペレツトとほぼ同粒径の焼成ペ
レツトが添加されて一様に混合される。 1 is a coal ash tank for storing coal ash; 2 is a humidifier for pre-humidifying the coal ash quantitatively sent out from the coal ash tank 1 to make it easier to granulate; 3 is a humidifier for storing the pre-moistened coal ash.
A dish-type or kiln-type granulator is used to granulate raw pellets with a diameter of 0.5 to 5 mm, 4 is a grate-type firing device for firing the raw pellets, and granulator 3 is a granulator that granulates raw pellets and fired pellets in the middle of the process. It is connected by a pellet feed line 6 with a mixer 5. The firing device 4 includes an endless grate-type pallet 7 that moves from a supply section a to a discharge section b;
A drying furnace 8 for drying the raw pellets placed on the pallet 7, an ignition furnace 9 for igniting the unburned coal in the surface layer of the pellets dried by the drying furnace 8, and a movement route for the pallet 7. It is composed of a plurality of wind boxes 10 provided below, and exhaust fans 11 and 12 for sucking and passing the atmosphere into the pellet through these wind boxes 10, and sucking exhaust gas from the high temperature part wind box 10A. is sent to the drying oven 8 by an exhaust fan 12, and the suction exhaust gas from other wind boxes 10 is discharged into the atmosphere by the exhaust fan 11 via a dust collector 13. Reference numeral 14 denotes a sieving machine that removes coarse defects with a particle size of 5 mm or more from the fired pellets fired by the firing device 4, and 15 denotes a product fine aggregate from which the rejects have been removed by the sieving machine 14. A first distribution chute for taking out a portion, 16 is the first distribution chute 1
This is a transfer line for sending the fired pellets taken out by 5 to the firing device 4 as pallet bedding. Further, a second distribution chute 17 is provided in the middle of the transfer line 16, and a portion of the fired pellets is supplied to a mixer 5 provided in the middle of the raw pellet supply line 6.
In this mixer 5, fired pellets having approximately the same particle size as the raw pellets are added to the raw pellets having a diameter of 0.5 to 5 mm and mixed uniformly.
次に、製造方法について説明する。石炭灰槽1
から出た石炭灰は、加湿機2で予湿された後、造
粒機3で0.5〜5mm径の生ペレツトに造粒され
る。そして、この生ペレツトは生ペレツト供給ラ
イン6を介して焼成装置4に送られるが、生ペレ
ツト供給ライン6途中の混合機5において、既に
焼成され且つ生ペレツトと同粒径の焼成ペレツト
が所定量(例えば10〜50重量%の割合で)生ペレ
ツト中に添加混合される。こうして、生ペレツト
と焼成ペレツトとが混合された混合ペレツトは、
パレツト7上に供給されて乾燥炉8で乾燥された
後、点火炉9によつてその表層部に着火され、そ
して着火された後は、大気の吸収によつて上層部
から下層部へ順に焼成される。焼成されたペレツ
トは、排出部bから篩分機14に排出されて、不
良分が取除かれる。そして、更に不良分が取除か
れた焼成ペレツトは第1分配シユート15よりそ
の一部が取出されて、移送ライン16を介して混
合機5及び焼成装置4に送られ、また残りの焼成
ペレツトは製品(人工細骨材)として貯えられ
る。このように、あらかじめ生ペレツト中に、こ
の生ペレツトと同粒径の焼成ペレツトを添加混合
した後、この混合したもの自身を、火格式焼成装
置により焼成するので、ペレツト同士の融着がほ
とんどなくなる。なお、ペレツト同士が融着しな
くなるのは、既に固化された焼成ペレツトには未
燃炭分がほとんど残存しないため、焼成されたペ
レツトは生ペレツトに比べて発熱量が少ないので
ペレツト層全体の熱量が緩和されるために隣接す
るペレツト同志が融着しないものと考えられる。
上記方法によると、ペレツト同士が融着しないの
で、ペレツト中の未燃炭を完全燃焼させることが
できる。 Next, the manufacturing method will be explained. Coal ash tank 1
The coal ash produced is pre-humidified by a humidifier 2 and then granulated by a granulator 3 into green pellets with a diameter of 0.5 to 5 mm. The raw pellets are then sent to the firing device 4 via the raw pellet supply line 6, but in the mixer 5 in the middle of the raw pellet supply line 6, a predetermined amount of fired pellets that have already been fired and have the same particle size as the raw pellets are mixed. It is added and mixed into the raw pellets (for example, in a proportion of 10 to 50% by weight). In this way, the mixed pellets made by mixing raw pellets and fired pellets are
After being supplied onto the pallet 7 and dried in the drying oven 8, the surface layer is ignited in the ignition furnace 9, and after being ignited, it is fired in order from the upper layer to the lower layer by absorption of the atmosphere. be done. The fired pellets are discharged from the discharge section b to the sieve 14 to remove defective particles. Then, a part of the fired pellets from which the defects have been removed is taken out from the first distribution chute 15 and sent to the mixer 5 and the firing device 4 via the transfer line 16, and the remaining fired pellets are It is stored as a product (artificial fine aggregate). In this way, fired pellets with the same particle size as the raw pellets are added and mixed into the raw pellets in advance, and then the mixed pellets themselves are fired in a grate type firing device, so there is almost no fusion between the pellets. . The reason why the pellets do not fuse together is because almost no unburned coal remains in the already solidified fired pellets, and the calorific value of the fired pellets is lower than that of raw pellets, so the amount of heat in the entire pellet layer is It is thought that because of the relaxation, adjacent pellets do not fuse together.
According to the above method, since the pellets do not fuse together, the unburned coal in the pellets can be completely combusted.
ここで、上記製造方法による実験例について説
明する。なお、この実験においては、石炭灰とし
て6.33%の未燃炭を含むものを使用すると共に、
内径350mm、高さ500mmのバツチ型焼成ポツトを使
用した。まず、石炭灰を内径が800mmの皿型造粒
機で0.5〜3mm径の生ペレツトに造粒し、この生
ペレツトに同じ粒径の焼成ペレツトを50%(重量
%)の割合で添加して混合し、次に床敷ペレツト
(上記焼成ペレツトと同じもの)が50mmの厚みで
もつて敷かれた焼成ポツト内に上記混合ペレツト
を装入し、次に約200℃の熱ガスを4分間焼成ポ
ツト上部から下部に向つて通して混合ペレツトを
乾燥し、その後約900℃の熱ガスを30秒間通して
層表面の混合ペレツト内の未燃炭に着火させ、以
後、混合ペレツト層底面の温度が100℃になるま
で大気を吸引して、焼成及び冷却を行なつた。上
記実験によつて得られた焼成ペレツトと従来方法
によつて得られた焼成ペレツトとの外観を比較す
ると、従来例によるものには、その表面及び内部
にペレツト同士の融着状態が見られる(添付参考
写真(イ)(平面視)、(ロ)(断面視)参照)が、上記
実験例によるものには、その表面及び内部にペレ
ツト同士の融着状態が見られない(添付参考写真
(ハ)(平面視)参照)。また、その未燃炭分も0.5%
であり、ほぼ完全燃焼されている。なお、上記し
た方法によつて細骨材を製造する場合、生ペレツ
トと焼成ペレツトとの配合比、焼成ポツトへの装
入量、点火温度、着火時間等は石炭灰中の未燃炭
の含有量によつて左右され、例えば未燃炭の量が
多くなる程、焼成ペレツトの配合比(添加比)を
高くする必要があり、また焼成ポツトへの混合ペ
レツトの装入量を減少させる必要がある。なお、
未燃炭の量が約2〜8%の範囲であれば、点火温
度は1000℃以下、点火時間は30秒程度でよいこと
が判明した。以上のように、本発明によれば、造
粒後の生ペレツト中に、既に焼成された焼成ペレ
ツトのうち粒径が生ペレツトとほぼ同じ大きさの
ものを添加混合し、この混合したものを火格式の
パレツト上に供給して焼成するので、ペレツト同
志の融着がほとんどない状態でペレツト中の未燃
炭を完全燃焼させることができる。 Here, an experimental example using the above manufacturing method will be explained. In addition, in this experiment, coal ash containing 6.33% unburned coal was used, and
A batch-type firing pot with an inner diameter of 350 mm and a height of 500 mm was used. First, coal ash is granulated into raw pellets with a diameter of 0.5 to 3 mm using a dish-type granulator with an inner diameter of 800 mm, and calcined pellets of the same particle size are added to the raw pellets at a ratio of 50% (wt%). The above mixed pellets were then placed in a firing pot lined with bedding pellets (same as the above fired pellets) with a thickness of 50 mm, and then heated with hot gas at about 200°C for 4 minutes in the firing pot. The mixed pellets are dried by passing from the top to the bottom, and then hot gas at about 900℃ is passed through for 30 seconds to ignite the unburned coal in the mixed pellets on the surface of the layer, after which the temperature at the bottom of the mixed pellet layer is 100℃. Firing and cooling were performed by suctioning out the atmosphere until the temperature was . Comparing the appearance of the fired pellets obtained in the above experiment and those obtained by the conventional method, it is found that the pellets in the conventional method have a state of fusion between the pellets on the surface and inside ( In the attached reference photos (a) (planar view) and (b) (cross-sectional view)), no fusion of pellets is observed on the surface or inside of the pellets according to the above experimental example (see attached reference photos).
(See (c) (planar view)). In addition, the unburned coal content is 0.5%.
It is almost completely burned. In addition, when producing fine aggregate by the method described above, the blending ratio of raw pellets and fired pellets, the amount charged into the firing pot, the ignition temperature, the ignition time, etc. are determined depending on the content of unburned coal in the coal ash. For example, as the amount of unburned coal increases, it is necessary to increase the blending ratio (addition ratio) of fired pellets, and it is necessary to reduce the amount of mixed pellets charged into the firing pot. In addition,
It has been found that if the amount of unburned coal is in the range of approximately 2 to 8%, the ignition temperature may be 1000°C or less and the ignition time may be approximately 30 seconds. As described above, according to the present invention, calcined pellets that have already been fired and have approximately the same particle size as the raw pellets are added and mixed into the raw pellets after granulation, and the mixed pellets are mixed. Since the pellets are fed onto a grate-type pallet and fired, the unburned coal in the pellets can be completely combusted with almost no fusion between the pellets.
図面は本発明の一実施例の製造工程を示すもの
である。
3……造粒機、4……火格子式焼成装置、5…
…混合機、6……ペレツト供給ライン、7……パ
レツト、15……第1分配シユート、16……移
送ライン、17……第2分配シユート。
The drawings show the manufacturing process of one embodiment of the present invention. 3... Granulator, 4... Grate type baking device, 5...
... mixer, 6 ... pellet supply line, 7 ... pallet, 15 ... first distribution chute, 16 ... transfer line, 17 ... second distribution chute.
Claims (1)
し、この生ペレツトを火格子式焼成装置により焼
成して人工細骨材を製造する方法において、上記
造粒後の生ペレツト中に、既に焼成された焼成ペ
レツトのうち粒径が上記生ペレツトとほぼ同じ大
きさのものを添加混合し、この混合したものを火
格式のパレツト上に供給して焼成することを特徴
とする人工細骨材の製造方法。1. In a method of producing artificial fine aggregate by granulating coal ash into raw pellets with a diameter of 0.5 to 5 mm and firing the raw pellets using a grate-type firing device, the raw pellets after granulation already include An artificial fine aggregate characterized in that fired pellets having approximately the same particle size as the above-mentioned raw pellets are added and mixed, and the mixed product is fed onto a grate-type pallet and fired. manufacturing method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57149712A JPS5939758A (en) | 1982-08-27 | 1982-08-27 | Manufacture of artificial fine aggregate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57149712A JPS5939758A (en) | 1982-08-27 | 1982-08-27 | Manufacture of artificial fine aggregate |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5939758A JPS5939758A (en) | 1984-03-05 |
JPS6218505B2 true JPS6218505B2 (en) | 1987-04-23 |
Family
ID=15481169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57149712A Granted JPS5939758A (en) | 1982-08-27 | 1982-08-27 | Manufacture of artificial fine aggregate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5939758A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03184188A (en) * | 1989-12-13 | 1991-08-12 | Seikosha Co Ltd | Image recognition device |
JP2005255515A (en) * | 2004-02-13 | 2005-09-22 | Taiheiyo Cement Corp | Method for manufacturing sintered compact |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5738364A (en) * | 1980-08-15 | 1982-03-03 | Kobe Steel Ltd | Manufacture of fly ash granules |
-
1982
- 1982-08-27 JP JP57149712A patent/JPS5939758A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5738364A (en) * | 1980-08-15 | 1982-03-03 | Kobe Steel Ltd | Manufacture of fly ash granules |
Also Published As
Publication number | Publication date |
---|---|
JPS5939758A (en) | 1984-03-05 |
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