JPH0743319A - Method and device for measuring moisture content of coal - Google Patents
Method and device for measuring moisture content of coalInfo
- Publication number
- JPH0743319A JPH0743319A JP18792593A JP18792593A JPH0743319A JP H0743319 A JPH0743319 A JP H0743319A JP 18792593 A JP18792593 A JP 18792593A JP 18792593 A JP18792593 A JP 18792593A JP H0743319 A JPH0743319 A JP H0743319A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- water content
- belt conveyor
- measuring
- microwave
- 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.)
- Pending
Links
Landscapes
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、石炭の水分測定方法お
よびその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring water content of coal.
【0002】[0002]
【従来の技術】一般に、コークス炉に装入する石炭の水
分値は、コークス炉の操業指針やアクション上非常に重
要な情報である。すなわち、石炭の水分値はコークス炉
操業の熱バランスに大きな影響を与えるだけでなく、コ
ークス炉に装入された石炭の嵩密度を変動させ、コーク
ス品質にも影響を及ぼすことになる。したがって、コー
クス炉に装入する前に石炭の水分測定を行っているケー
スが多い。2. Description of the Related Art Generally, the water content of coal charged in a coke oven is very important information for the operation guideline and action of the coke oven. That is, the water content of coal not only greatly affects the heat balance of the coke oven operation, but also changes the bulk density of the coal charged in the coke oven and affects the coke quality. Therefore, in many cases, the moisture content of coal is measured before charging it into the coke oven.
【0003】従来、実施されてきた石炭水分を連続的に
測定する方法の一つとして、図3に示すようなマイクロ
波を用いた水分測定装置がある。図示のように、水分測
定装置1はマイクロ波送信アンテナ1aを石炭2を搬送
するベルトコンベア3の下方に所定の角度で取付け、石
炭2を透過したマイクロ波をベルトコンベア3の上方に
取付けたマイクロ波受信アンテナ1bで受信して演算装
置4に入力し、その演算結果を表示装置5に出力して記
録するように構成される。As one of the conventional methods for continuously measuring the water content of coal, there is a water content measuring apparatus using a microwave as shown in FIG. As shown in the figure, the water content measuring apparatus 1 has a microwave transmitting antenna 1a attached at a predetermined angle below a belt conveyor 3 that conveys coal 2, and a microwave that transmits the coal 2 is attached above the belt conveyor 3. The wave receiving antenna 1b receives the signal, inputs it to the arithmetic unit 4, outputs the arithmetic result to the display unit 5, and records it.
【0004】いま、石炭のバルク密度をQ(g/cm3)、そ
の層厚をd(cm) とし、マイクロ波受信アンテナ1bで
受信される透過後のマイクロ波の位相変化をφ(deg)、
減衰の度合い(受信波の送信波に対する比率)をD
(−)とすると、被測定物である石炭の水分W(%)と
φ,Dとの間の関係は、一般に制限された水分の範囲内
で次式により表される。Now, assuming that the bulk density of coal is Q (g / cm 3 ), and the layer thickness thereof is d (cm), the phase change of the microwave transmitted through the microwave receiving antenna 1b is φ (deg). ,
Degree of attenuation (ratio of received wave to transmitted wave) is D
Assuming (-), the relationship between the water content W (%) of the coal to be measured and φ, D is generally expressed by the following equation within the limited water content range.
【0005】 W={A・φ/(Q・d)}+{B・D/(Q・d)}+C ………(1) ここで、Qはバルク密度(g/cm3)、dは原料層の厚さ
(cm) 、A,B,Cはマイクロ波の性状により決まる定
数である。上記のバルク密度Qを直接連続的に求めるこ
とは難しいが、ガンマ線等の放射線が物質中を通過する
際に弱められるという性質を利用することによって、密
度と放射線強度を結びつけることができる。そこで、前
出図3に示したように、ベルトコンベア3の上下部に配
設した放射線源6aと放射線検出器6bからなる放射線
測定装置6を用いて、石炭2を透過して減衰した放射線
の強さI(r;レントゲン)を測定するのである。この
減衰した放射線の強さIは、下記(2) 式で示す公知のラ
ンバートの法則に基づいて変化する。W = {Aφ / (Qd)} + {BD / (Qd)} + C (1) where Q is the bulk density (g / cm 3 ), d Is the thickness of the raw material layer (cm), and A, B and C are constants determined by the properties of the microwave. Although it is difficult to directly obtain the above-mentioned bulk density Q directly, it is possible to combine the density and the radiation intensity by utilizing the property that radiation such as gamma rays is weakened when passing through a substance. Therefore, as shown in FIG. 3, the radiation measuring device 6 including the radiation source 6a and the radiation detector 6b arranged on the upper and lower portions of the belt conveyor 3 is used to measure the radiation transmitted through the coal 2 and attenuated. The intensity I (r; roentgen) is measured. The intensity I of the attenuated radiation changes based on the well-known Lambert's law shown by the following equation (2).
【0006】 I=I0 exp(−η・Q・d) ……………(2) ここで、I0 は放射線源6aから出力される減衰しない
放射線の強さ(r)であり、ηは放射線の性状により決
まる定数である。この(2) 式を変形して下記(3) 式と
し、 Q・d=−(1/η)・ln(I/I0 ) ……………(3) この(3) 式を(1) 式と組み合わせることにより、下記
(4) 式が得られる。I = I 0 exp (−η · Q · d) (2) where I 0 is the intensity (r) of the non-attenuated radiation output from the radiation source 6 a, and η Is a constant determined by the nature of radiation. This equation (2) is transformed into the following equation (3), and Q · d = − (1 / η) · ln (I / I 0 ) ………… (3) This equation (3) is transformed into (1 ) Combined with the formula
Equation (4) is obtained.
【0007】 W={A′・φ/ln(I/I0 )}+{B′・D/ln(I/I0 )}+C ……………(4) ここで、A′=−A・η、B′=B・ηである。この
(4) 式により、マイクロ波に関するφ, Dの測定値に対
して、放射線伝送測定結果を組み合わせることにより、
水分値Wが得られることになる。W = {A ′ · φ / ln (I / I 0 )} + {B ′ · D / ln (I / I 0 )} + C ... (4) Here, A ′ = − A · η and B ′ = B · η. this
By combining the radiation transmission measurement results with the measured values of φ and D for microwaves according to equation (4),
The water content value W will be obtained.
【0008】[0008]
【発明が解決しようとする課題】しかしながら、上記し
たようなマイクロ波式の水分測定装置1に使用される放
射線測定装置6は、放射線によって人体に悪影響を及ぼ
すことから取扱いが厳しく規制されており、その導入設
置に当たっては関係中央官庁への届出義務がある外、設
置後のメンテナンスなどに関して細かな規則が決められ
ている。そのため、その使用にあたっては多大のコスト
とマンパワーを要するという問題があった。However, the radiation measuring device 6 used in the above-mentioned microwave type moisture measuring device 1 is severely regulated because its radiation adversely affects the human body. When installing and installing it, there are obligations to notify the relevant central government agencies, and detailed rules are set regarding maintenance after installation. Therefore, there is a problem in that the use thereof requires a great deal of cost and manpower.
【0009】本発明は、上記のような従来技術の有する
課題を解決すべくしてなされたものであって、石炭の密
度補正に放射線測定装置を用いなくとも実用上使用可能
な精度を有する石炭の水分測定方法およびその装置を提
供することを目的とする。The present invention has been made in order to solve the problems of the prior art as described above, and has the accuracy of being practically usable without using a radiation measuring device for density correction of coal. An object of the present invention is to provide a method for measuring water content and an apparatus therefor.
【0010】[0010]
【課題を解決するための手段】本発明は、ベルトコンベ
アで搬送される石炭にマイクロ波を伝播させて、その変
化より水分値を求める水分測定方法において、搬送され
る石炭の層厚を一定に調整した状態で水分を測定するこ
とを特徴とする石炭の水分測定方法である。また、本発
明は、ベルトコンベアで搬送される石炭にマイクロ波を
用いてこれを伝播させて、その変化より水分値を求める
水分測定装置において、前記ベルトコンベア上に設置さ
れて前記ベルトコンベアの幅方向に拡縮自在に調整され
る左右一対のサイドスカートと、石炭の層厚を一定に調
整する均し装置とを備えたことを特徴とする石炭の水分
測定装置である。According to the present invention, a microwave is propagated to a coal conveyed by a belt conveyor, and a moisture value is obtained from the change of the microwave to obtain a moisture value. A method for measuring water content of coal, which comprises measuring water content in an adjusted state. Further, the present invention, by propagating this using microwave to coal conveyed by the belt conveyor, in a moisture measuring apparatus for obtaining the moisture value from the change, the width of the belt conveyor installed on the belt conveyor. A water content measuring device for coal, comprising: a pair of left and right side skirts that can be freely expanded and contracted in a given direction, and a leveling device that adjusts a layer thickness of coal to a constant level.
【0011】[0011]
【作 用】以下に、本発明の構成について説明すると、
図1に示すように、左右一対のサイドスカート7,7が
ベルトコンベア3上の上流側ベルトコンベア3aからの
石炭落下位置付近で、水分測定装置1を挟むようにして
配設され、それぞれサイドスカート駆動装置8, 8によ
ってベルトコンベア3の幅方向に拡縮自在とされる。こ
のサイドスカート駆動装置8, 8は、サイドスカート制
御装置9を介して石炭送り量制御装置10からの信号に基
づいて制御される。また、このサイドスカート7, 7の
ほぼ中央部の頂部には、石炭2の層厚を調整する均し装
置11が保持部材12, 12によって所定の高さに設けられ
る。[Operation] The structure of the present invention will be described below.
As shown in FIG. 1, a pair of left and right side skirts 7, 7 are arranged near the coal dropping position from the upstream side belt conveyor 3a on the belt conveyor 3 so as to sandwich the moisture measuring device 1, and the side skirt drive devices are arranged respectively. It is possible to expand and contract in the width direction of the belt conveyor 3 by 8, 8. The side skirt drive devices 8 and 8 are controlled based on a signal from the coal feed amount control device 10 via the side skirt control device 9. Further, a leveling device 11 for adjusting the layer thickness of the coal 2 is provided at a predetermined height by the holding members 12 and 12 on the top of the side skirts 7 and 7 at the substantially central portion.
【0012】いま、石炭2の層厚が一定値であるL(m
m)となるように均し装置11の下面高さが設定されてい
るとき、石炭2の搬送量WCOAL(t/h)に対して、予め定
められた嵩密度になるようなサイドスカート7, 7の間
隔WSS(mm)は、下記(5) 式で求められる。 WSS={(WCOAL/K)−SBC}/L ……………(5) ここで、Kはベルト速度と石炭の密度によって決まる定
数、SBCは図2に示すベルトコンベア3上の石炭断面の
下部の面積である。Now, the layer thickness of coal 2 is L (m
When the lower surface height of the leveling device 11 is set to be m), the side skirt 7 has a predetermined bulk density with respect to the transport amount W COAL (t / h) of the coal 2. The distance W SS (mm) between the distances 7 and 7 is calculated by the following equation (5). W SS = {(W COAL / K) -S BC } / L (5) Here, K is a constant determined by the belt speed and the coal density, and S BC is on the belt conveyor 3 shown in FIG. Is the area of the bottom of the coal cross section.
【0013】この(5) 式により、均し装置11をかけた後
の石炭の層厚が決定されることになるから、その層厚を
測定する必要がない。したがって、このように石炭の密
度を一定にすることができるから、前出(1) 式の水分測
定関係式は、下記(6) 式のように簡素に表すことができ
る。 W=(A″・φ/d)+(B″・D/d)+C ……………(6) ここで、定数A″,B″はそれぞれA″=A/Q,B″
=B/Qである。Since the layer thickness of the coal after being applied with the leveling device 11 is determined by the equation (5), it is not necessary to measure the layer thickness. Therefore, since the density of coal can be made constant in this way, the moisture measurement relational expression of the above equation (1) can be simply expressed as the following equation (6). W = (A ″ · φ / d) + (B ″ · D / d) + C (6) Here, the constants A ″ and B ″ are A ″ = A / Q and B ″, respectively.
= B / Q.
【0014】これによって、水分測定装置1によってマ
イクロ波の位相変化φおよび減衰の度合いDを測定する
のみで、放射線伝送測定結果を適用した従来法とほぼ同
程度の精度で水分Wを測定することが可能である。As a result, the water content W can be measured with substantially the same accuracy as the conventional method using the radiation transmission measurement result, by only measuring the phase change φ and the attenuation degree D of the microwave with the water content measuring device 1. Is possible.
【0015】[0015]
【実施例】本発明法をコークス炉に石炭を送る石炭乾燥
機の出側におけるベルトコンベアに適用した。このベル
トコンベアの仕様は、ベルト幅;1050mm、ベルト速度;
210m/min、最大搬送能力;600t/h、実際の石炭送り量;
400t/h(石炭乾燥機の最大処理能力と同じ)である。ま
た層厚Lは110 mmとし、サイドスカート7の幅の制御周
期は1分とした。なお、サイドスカート7の材質はステ
ンレス(SUS 304)製とし、サイドスカート駆動装置8に
は油圧シリンダを用い、水分の測定周期はサイドスカー
ト7の幅の制御周期と一致させて1分とした。本発明法
による測定結果を表1に示した。なお、比較のために、
従来法による測定結果を同表に併せて示した。また、石
炭乾燥機の手前で粉砕機により粒度を調整した後、石炭
乾燥機により目標値6.5 %となるように水分制御を行っ
た。また、マイクロ波式の水分測定装置1の校正用とし
て、絶対乾燥法による測定を1回/日の頻度で行った。EXAMPLE The method of the present invention was applied to a belt conveyor on the outlet side of a coal dryer for feeding coal to a coke oven. The specifications of this belt conveyor are: belt width; 1050mm, belt speed;
210m / min, maximum transfer capacity; 600t / h, actual coal feed rate;
400t / h (same as maximum processing capacity of coal dryer). The layer thickness L was 110 mm, and the side skirt 7 width control period was 1 minute. The material of the side skirt 7 was made of stainless steel (SUS 304), a hydraulic cylinder was used as the side skirt drive device 8, and the moisture measurement period was set to 1 minute in accordance with the width control period of the side skirt 7. The measurement results by the method of the present invention are shown in Table 1. For comparison,
The measurement results by the conventional method are also shown in the same table. In addition, after adjusting the particle size with a pulverizer before the coal dryer, the water content was controlled with the coal dryer so that the target value was 6.5%. Further, for calibration of the microwave type moisture measuring device 1, measurement by an absolute drying method was performed once per day.
【0016】[0016]
【表1】 [Table 1]
【0017】この表1から明らかなように、石炭の粒度
のばらつきが大きいにもかかわらず、本発明法によれ
ば、絶対乾燥法との差は従来法と変わりがなく、従来法
と同様の精度が得られることが確認できた。As is clear from Table 1, according to the method of the present invention, the difference between the absolute drying method and the conventional method is the same as that of the conventional method, even though the variation in the particle size of coal is large. It was confirmed that accuracy was obtained.
【0018】[0018]
【発明の効果】以上説明したように、本発明によれば、
搬送される石炭の量に応じてベルトコンベア上での層厚
を常に一定にすることにより石炭の密度を一定に制御す
るようにしたので、従来法のように放射線計器を用いる
必要がなく、これによって水分測定装置の導入コストを
低減することが可能となり、またメンテナンスの負荷を
軽減することも可能である。As described above, according to the present invention,
Since the density of coal is controlled to be constant by always keeping the layer thickness on the belt conveyor constant according to the amount of coal to be conveyed, it is not necessary to use a radiation meter unlike the conventional method, This makes it possible to reduce the introduction cost of the moisture measuring device and also reduce the maintenance load.
【図1】本発明の実施例を示す(a) 平面図、(b) A−A
矢視断面図である。1A and 1B are plan views showing an embodiment of the present invention, and FIG.
FIG.
【図2】図1のB−B矢視断面図である。FIG. 2 is a sectional view taken along the line BB of FIG.
【図3】従来例の構成を示す概要図である。FIG. 3 is a schematic diagram showing a configuration of a conventional example.
1 水分測定装置 2 石炭 3 ベルトコンベア 4 演算装置 5 表示装置 7 サイドスカート 8 サイドスカート駆動装置 9 サイドスカート制御装置 10 石炭送り量制御装置 11 均し装置 12 保持部材 1 Moisture Measuring Device 2 Coal 3 Belt Conveyor 4 Computing Device 5 Display Device 7 Side Skirt 8 Side Skirt Drive Device 9 Side Skirt Control Device 10 Coal Feeding Volume Control Device 11 Leveling Device 12 Holding Member
Claims (2)
イクロ波を伝播させて、その変化より水分値を求める水
分測定方法において、搬送される石炭の層厚を一定に調
整した状態で水分を測定することを特徴とする石炭の水
分測定方法。1. A water content measuring method in which a microwave is propagated to a coal conveyed by a belt conveyor to obtain a water content value from the change, in which the water content is measured while the layer thickness of the coal being conveyed is adjusted to be constant. A method for measuring the moisture content of coal, characterized in that
イクロ波を用いてこれを伝播させて、その変化より水分
値を求める水分測定装置において、前記ベルトコンベア
上に設置されて前記ベルトコンベアの幅方向に拡縮自在
に調整される左右一対のサイドスカートと、石炭の層厚
を一定に調整する均し装置とを備えたことを特徴とする
石炭の水分測定装置。2. A water content measuring device, wherein microwave is propagated to coal conveyed by a belt conveyor by using microwaves, and a water content value is obtained from the change of the microwave, which is installed on the belt conveyor and the width direction of the belt conveyor. A moisture measuring device for coal, comprising: a pair of left and right side skirts that can be freely expanded and contracted, and a leveling device that constantly adjusts the layer thickness of coal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18792593A JPH0743319A (en) | 1993-07-29 | 1993-07-29 | Method and device for measuring moisture content of coal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18792593A JPH0743319A (en) | 1993-07-29 | 1993-07-29 | Method and device for measuring moisture content of coal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0743319A true JPH0743319A (en) | 1995-02-14 |
Family
ID=16214608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18792593A Pending JPH0743319A (en) | 1993-07-29 | 1993-07-29 | Method and device for measuring moisture content of coal |
Country Status (1)
Country | Link |
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JP (1) | JPH0743319A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001011342A1 (en) * | 1999-08-09 | 2001-02-15 | Colin Roy Jeffress | Automated sample analysis system |
JP2006052375A (en) * | 2004-08-13 | 2006-02-23 | Hyundai Motor Co Ltd | Continuous surface-modifying apparatus of waste rubber powder using microwave and surface-modifying method using the same |
JP2007290254A (en) * | 2006-04-25 | 2007-11-08 | Nippon Steel Corp | Sorting method for recyclable plastics and non-recyclable foreign matter |
JP2014112053A (en) * | 2012-12-05 | 2014-06-19 | Nippon Steel & Sumitomo Metal | Measuring method of coal moisture on conveyor |
JP2019070535A (en) * | 2017-10-06 | 2019-05-09 | マイクロメジャー株式会社 | Measuring apparatus and measuring method of moisture content rate and the like |
KR20230035664A (en) | 2020-08-03 | 2023-03-14 | 쿠리타 고교 가부시키가이샤 | Management system, management device, management method and management program |
-
1993
- 1993-07-29 JP JP18792593A patent/JPH0743319A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001011342A1 (en) * | 1999-08-09 | 2001-02-15 | Colin Roy Jeffress | Automated sample analysis system |
US6739209B1 (en) | 1999-08-09 | 2004-05-25 | Colin Roy Jeffress | Automated sample analysis system |
JP2006052375A (en) * | 2004-08-13 | 2006-02-23 | Hyundai Motor Co Ltd | Continuous surface-modifying apparatus of waste rubber powder using microwave and surface-modifying method using the same |
JP2007290254A (en) * | 2006-04-25 | 2007-11-08 | Nippon Steel Corp | Sorting method for recyclable plastics and non-recyclable foreign matter |
JP2014112053A (en) * | 2012-12-05 | 2014-06-19 | Nippon Steel & Sumitomo Metal | Measuring method of coal moisture on conveyor |
JP2019070535A (en) * | 2017-10-06 | 2019-05-09 | マイクロメジャー株式会社 | Measuring apparatus and measuring method of moisture content rate and the like |
KR20230035664A (en) | 2020-08-03 | 2023-03-14 | 쿠리타 고교 가부시키가이샤 | Management system, management device, management method and management program |
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