JP3570314B2 - Coal moisture measurement method in humidification equipment - Google Patents

Coal moisture measurement method in humidification equipment Download PDF

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Publication number
JP3570314B2
JP3570314B2 JP34733199A JP34733199A JP3570314B2 JP 3570314 B2 JP3570314 B2 JP 3570314B2 JP 34733199 A JP34733199 A JP 34733199A JP 34733199 A JP34733199 A JP 34733199A JP 3570314 B2 JP3570314 B2 JP 3570314B2
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Japan
Prior art keywords
coal
moisture
box
measurement
dryer
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Expired - Fee Related
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JP34733199A
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JP2001165882A (en
Inventor
真二郎 馬場
幸一 篠原
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JFE Steel Corp
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JFE Steel Corp
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Description

【0001】
【発明が属する技術分野】
本発明は、コークス炉に装入する石炭を事前に乾燥することによって、その水分を調整する調湿炭設備において、石炭の水分調整を行う際に必要となる石炭の水分量を正確に測定する方法に関する。
【0002】
【従来の技術】
石炭をコークス炉に装入するに先立って行われる石炭の調湿は、図1に示すように、配合ベッド1よりベルトコンベア2を介して搬送した石炭を一旦、湿炭ホッパー3に貯蔵し、湿炭ホッパー3から切り出し装置4により定量の石炭を乾燥機5に導入し、乾燥機5で水分調整を行ったのち、コークス炉へと送り出すのが、一般的である。
【0003】
ここで、石炭を乾燥させて水分調整を行うのは、コークス炉に装入する石炭の水分量が一定であれば、コークス炉での消費エネルギーが低減される上、得られるコークスの品質が向上するからである。しかし、石炭の水分が低くなりすぎると、例えば石炭の輸送過程やコークス炉装入時に塵の発生を招く等の操業上の問題を誘発することから、この種の問題が生じない適正範囲に、石炭の水分量を調整することとしている。
【0004】
ところで、乾燥機の運転開始期や使用する石炭銘柄の切替え時には、乾燥機における石炭処理量が急激に変化するため、乾燥機における熱量制御が石炭処理量の変化に対応し切れない結果、石炭が過度に乾燥されることがある。
このように石炭が過乾燥された場合に備えて、図1に示すように、乾燥機5からコークス炉へ石炭6を搬送するコンベア7上に、水分計8を設置し、この水分計8で測定した水分測定値に基づいて、過乾燥の場合には、乾燥機5の出側に設けた加水機9から水を石炭に供給する、フィードバック制御を行っている。
【0005】
【発明が解決しようとする課題】
前記水分計8には、非接触の赤外線式が用いられるのが一般的であるが、水分計8を設置する測定箇所の環境が劣悪であるために、正確な水分値の測定が難しいという問題があった。
【0006】
この問題に対して、開平2−27553号公報では、石炭測定面と水分計との距離を計測し、水分計の高さを制御することによって、測定精度を高めることが、開示されている。しかしながら、水分計の測定距離を制御することでは、測定雰囲気の影響を完全に排除するのは難しく、さらなる測定精度の向上が求められている。
【0007】
そこで、本発明は、石炭の水分を調整する調湿炭設備において、乾燥後の石炭の水分調整を行う際に必要になる、石炭の水分測定を、劣悪な環境下にも正確に行うことのできる方法について、提案することを目的とする。
【0008】
【課題を解決するための手段】
本発明者らは、調湿炭設備における石炭水分の測定精度を向上するために、該測定箇所の雰囲気について鋭意検討したところ、とりわけ石炭に付着した水分が蒸発することによって発生する水蒸気が測定の阻害になっていることを知見し、本発明を完成するに到った。
【0009】
すなわち、本発明は、コークス炉に装入する石炭を、その装入前に調湿炭設備の乾燥機に導入して石炭の水分を調整する際に、乾燥機とコークス炉との間において石炭の水分を測定するに当たり、該測定箇所の雰囲気中に発生した水蒸気を排除しつつ測定する方法において、該測定箇所に設ける水分計をボックス内に収容し、このボックスの上流側には集塵機を隣接配置すると共に、集塵配管を分岐させて該ボックスにも接続し、その集塵機を作動させて前記水分計の上流側において集塵を行うと同時に、該ボックス内に作用する吸引力によってボックス内集塵とともに水蒸気をも吸引除去しつつ水分測定を行うことを特徴とする調湿炭設備における石炭の水分測定方法である。
【0011】
【発明の実施の形態】
さて、本発明にかかる水分測定方法は、乾燥機を出た石炭の全水分を測定する箇所において、その雰囲気中に主として該石炭の付着水分が蒸発することによって発生した水蒸気を、この測定雰囲気から排除することに特徴があり、具体的には、図1に示した水分計8に、図2に示す構造を付帯させることによって、実現することができる。
【0012】
即ち、石炭調湿設備の乾燥機から出た石炭の場合、包蔵水分と付着水分とを含むものの、そのうちの主として付着水分は蒸発 (但し、乾燥過程では、包蔵水分も順次石炭表面に移動して付着水分化する) し、この水蒸気が前記測定雰囲気中に滞留し、それが赤外線に外乱として作用する。そして、このことが水分計の数値誤差となり、正確な水分値の測定を阻害していた。
そこで、本発明のように前記水蒸気を測定環境から排除すると、前記外乱要因を無くすことができ、いわゆる正確な測定を行うことができるようになるのである。
【0013】
その第1の方法としては、図2に示すように、水分計8を収容したボックス80の乾燥機5側に隣接して集塵機10を設置し、その集塵配管11を分岐させると共に、その一方をボックス80に接続する。そして、水分計8の上流側において、集塵機10を作動させて集塵を行うと同時に、集塵配管11において発生する吸引力をボックス80内にも作用させ、該ボックス80からも集塵を行うことによって、水分計8下方の測定箇所における水蒸気も同時に吸引除去する。この2系統の吸引によって、集塵機10側においては、石炭6中に乾燥機5による加熱で溜まっている水蒸気が吸引除去できると共に、ボックス80内の水分計8による測定に際しても石炭6表層に上昇する水蒸気を除去しつつ測定できる。このため、測定中の雰囲気から水蒸気が完全に除去され、水分計8にて正確な水分値の測定を行うことができるようになる。
また、水分計8Aを、図2中の集塵機10側のボックス80側に片寄らせて配置すれば、2系統の吸引を止めて1系統の吸引で行うことも可能である。この1系統の吸引のもとで測定を行う時は、集塵機10の水分計8Aの右方で予め石炭6中の水蒸気が除去されつつ水分計8A下に達し、水分計8Aの測定時にも集塵機10による吸引のもと測定が行われ、測定環境が確保される。このような吸引による測定方式であれば、調湿済石炭の飛散がなく好ましい。
【0015】
【実施例】
図1に示した調湿炭設備を用いて通常の配合炭の調湿操業を行うに当たり、水分計8による水分値の測定を、水蒸気を排除しない場合と水蒸気を排除する場合とで比較した。すなわち、同じ赤外線式水分計を用いて、一方は水分計8およびボックス80とを組み合わせた構造(従来例)、他方は水分計8およびボックス80に、さらに図2に示した集塵機10を付帯した構造(発明例)として、それぞれの方法について操業約1か月間に渡って水分値の比較測定を行った。
【0016】
その測定結果を、測定直後の石炭について、JIS M8811 (石炭類およびコークス類のサンプリング方法ならびに全水分・湿分測定方法) に則って測定した水分値と比較して、図に示す。図は、本発明にかかる水分測定装置の前後における赤外線水分計値とJIS分析値の相関をとったものである。従来は赤外線水分計値はJIS分析値より低めに出ていたが、本発明によりその誤差を極めて小さくすることが可能になった。同図に示すように、本発明に従って測定箇所の水蒸気を排除して水分値を測定した場合には、実際の水分値との誤差が極めて小さくなることがわかる。
【0017】
【発明の効果】
本発明によれば、石炭の水分を調整する調湿炭設備において、乾燥後の石炭の水分調整を行う際に必要になる、石炭の水分測定を、劣悪な環境下にも正確に行えるため、石炭の調湿誤差を抑制することができる。従って、一定水分率の石炭がコークス炉へ供給されるから、高品質のコークスを得ることができる。
【図面の簡単な説明】
【図1】調湿炭設備の一般的構成を示す模式図である。
【図2】水分計の構造を示す図である。
【図】石炭の水分分析値と水分計測定値との関係を示すグラフである。
【符号の説明】
1 配合ベッド
2 ベルトコンベア
3 湿炭ホッパー
4 切り出し装置
5 乾燥機
6 コンベア
7 石炭
8 水分計
9 加水機
10 集塵機
11 集塵配
0 ボックス
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention measures the moisture content of coal required when performing moisture adjustment of coal in a humidified coal facility for adjusting the moisture by previously drying coal charged into a coke oven. About the method.
[0002]
[Prior art]
As shown in FIG. 1, the humidity control of the coal performed before charging the coal into the coke oven is performed by temporarily storing the coal transported from the blending bed 1 via the belt conveyor 2 in the wet coal hopper 3, It is general that a fixed amount of coal is introduced from the wet coal hopper 3 into the dryer 5 by the cutting device 4, the moisture is adjusted by the dryer 5, and then the coal is sent to a coke oven.
[0003]
Here, the reason for adjusting the moisture by drying the coal is that if the amount of moisture in the coal charged into the coke oven is constant, the energy consumption in the coke oven is reduced and the quality of the obtained coke is improved. Because you do. However, if the water content of the coal is too low, it will cause operational problems such as the generation of dust during the transportation of the coal and the charging of the coke oven, and so on. The water content of the coal will be adjusted.
[0004]
By the way, at the start of the operation of the dryer or at the time of switching of the coal brand to be used, the amount of coal processing in the dryer changes rapidly.As a result, the calorie control in the dryer cannot fully respond to the change in the amount of coal processing. May be over dried.
As shown in FIG. 1, a moisture meter 8 is installed on a conveyor 7 for transporting the coal 6 from the dryer 5 to the coke oven as shown in FIG. Based on the measured moisture value, in the case of overdrying, feedback control is performed in which water is supplied to the coal from the water dispenser 9 provided on the outlet side of the dryer 5.
[0005]
[Problems to be solved by the invention]
In general, a non-contact infrared type is used for the moisture meter 8, but it is difficult to accurately measure the moisture value because the environment of a measurement place where the moisture meter 8 is installed is poor. was there.
[0006]
For this problem, in the real-Open 2-27553 discloses, measures the distance between the coal measurement surface and a moisture meter, by controlling the height of the instrument, is possible to improve the measurement accuracy, it is disclosed . However, it is difficult to completely eliminate the influence of the measurement atmosphere by controlling the measurement distance of the moisture meter, and further improvement in measurement accuracy is required.
[0007]
Accordingly, the present invention provides a moisture conditioning coal facility for adjusting the moisture of coal, which is required when adjusting the moisture of coal after drying, to accurately measure the moisture of coal even in a poor environment. The aim is to propose possible methods.
[0008]
[Means for Solving the Problems]
The present inventors have intensively studied the atmosphere at the measurement location in order to improve the measurement accuracy of coal moisture in the humidified coal facility, and in particular, water vapor generated due to evaporation of moisture adhering to coal has been measured. The inventor found that it was an obstacle, and completed the present invention.
[0009]
That is, the present invention, when the coal charged into the coke oven is introduced into the dryer of the humidifying coal facility before charging to adjust the moisture of the coal, the coal between the dryer and the coke oven In the method of measuring moisture while eliminating water vapor generated in the atmosphere at the measuring point, the moisture meter provided at the measuring point is housed in a box, and a dust collector is adjacent to the upstream side of the box. At the same time, the dust collection pipe is branched and connected to the box, and the dust collector is operated to perform dust collection on the upstream side of the moisture meter, and at the same time, the inside of the box is collected by a suction force acting in the box. This is a method for measuring the moisture of coal in a humidified coal facility, wherein moisture is measured while sucking and removing water vapor as well as dust .
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
By the way, the moisture measuring method according to the present invention is characterized in that at a point where the total moisture of the coal exiting the dryer is measured, water vapor generated mainly due to evaporation of the moisture adhering to the coal in the atmosphere is removed from the measuring atmosphere. It is characterized by elimination, and specifically, it can be realized by attaching the structure shown in FIG. 2 to the moisture meter 8 shown in FIG.
[0012]
In other words, in the case of coal discharged from the dryer of the coal humidity control equipment, although the stored moisture and the attached moisture are contained, mainly the attached moisture is evaporated (however, during the drying process, the stored moisture also moves to the coal surface sequentially. However, the water vapor stays in the measurement atmosphere, and acts as a disturbance to infrared rays. This resulted in a numerical error of the moisture meter, which hindered accurate measurement of the moisture value.
Therefore, when the water vapor is excluded from the measurement environment as in the present invention, the disturbance factor can be eliminated, and so-called accurate measurement can be performed.
[0013]
As a first method, as shown in FIG. 2, a dust collector 10 is installed adjacent to a dryer 5 side of a box 80 containing a moisture meter 8, a dust collection pipe 11 is branched, and one of the two is collected. Is connected to the box 80. Then, on the upstream side of the moisture meter 8, the dust collector 10 is operated to perform dust collection, and at the same time, the suction force generated in the dust collection pipe 11 is also applied to the inside of the box 80 to collect dust from the box 80. Thus, the water vapor at the measurement point below the moisture meter 8 is also simultaneously removed by suction. By the suction of the two systems, on the dust collector 10 side, the water vapor accumulated in the coal 6 by heating by the dryer 5 can be removed by suction, and at the time of the measurement by the moisture meter 8 in the box 80, it rises to the surface of the coal 6. It can be measured while removing water vapor. For this reason, the water vapor is completely removed from the atmosphere during the measurement, so that the moisture meter 8 can accurately measure the moisture value.
In addition, if the moisture meter 8A is arranged so as to be offset toward the box 80 on the dust collector 10 side in FIG. 2, it is possible to stop suction of two systems and perform suction by one system. When the measurement is performed under this one system of suction, the moisture in the coal 6 reaches below the moisture meter 8A while the water vapor in the coal 6 is removed in advance to the right of the moisture meter 8A of the dust collector 10. The measurement is performed under suction by 10 and the measurement environment is secured. Such a measuring method by suction is preferable because the humidified coal is not scattered.
[0015]
【Example】
In performing the ordinary humidity control operation of the coal blend using the humidity control facility shown in FIG. 1, the measurement of the moisture value by the moisture meter 8 was compared between the case where the steam was not removed and the case where the steam was removed. That is, using the same infrared moisture meter, one combination of a moisture meter 8 and the box 80 structure (conventional example), the other is the moisture meter 8 and box 80, the dust collector 1 0 shown further in FIG. 2 As an attached structure (inventive example), a comparative measurement of the moisture value was performed for each method over about one month of operation.
[0016]
FIG. 3 shows the measurement results of the coal immediately after the measurement, in comparison with the moisture values measured in accordance with JIS M8811 (a method of sampling coal and coke and a method of measuring total moisture and moisture). FIG. 3 shows the correlation between the infrared moisture meter values and the JIS analysis values before and after the moisture measuring apparatus according to the present invention. Conventionally, the infrared moisture meter value was lower than the JIS analysis value, but the present invention has made it possible to minimize the error. As shown in the figure, when the moisture value is measured while excluding the water vapor at the measurement location according to the present invention, it can be seen that the error from the actual moisture value becomes extremely small.
[0017]
【The invention's effect】
According to the present invention, in a humidified coal facility for adjusting the moisture of coal, which is necessary when adjusting the moisture of the coal after drying, the moisture measurement of the coal can be accurately performed even in a poor environment. It is possible to suppress the humidity control error of the coal. Accordingly, high-quality coke can be obtained because coal having a constant moisture content is supplied to the coke oven.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a general configuration of a humidification coal facility.
FIG. 2 is a diagram showing a structure of a moisture meter.
FIG. 3 is a graph showing a relationship between a moisture analysis value of a coal and a moisture meter measurement value.
[Explanation of symbols]
1 blending bed second belt conveyor 3 wet coal hopper 4 cut device 5 dryer 6 conveyor 7 coal 8 moisture meter 9 hydro machine 10 dust collector 11 Atsumarichirihai tube
80 box

Claims (1)

コークス炉に装入する石炭を、その装入前に調湿炭設備の乾燥機に導入して石炭の水分を調整する際に、乾燥機とコークス炉との間において石炭の水分を測定するに当たり、該測定箇所の雰囲気中に発生した水蒸気を排除しつつ測定する方法において、該測定箇所に設ける水分計をボックス内に収容し、このボックスの上流側には集塵機を隣接配置すると共に、集塵配管を分岐させて該ボックスにも接続し、その集塵機を作動させて前記水分計の上流側において集塵を行うと同時に、該ボックス内に作用する吸引力によってボックス内集塵とともに水蒸気をも吸引除去しつつ水分測定を行うことを特徴とする調湿炭設備における石炭の水分測定方法。When the coal charged into the coke oven is introduced into the dryer of the humidifying coal facility before charging, the moisture content of the coal is measured between the dryer and the coke oven. In a method of measuring while eliminating water vapor generated in the atmosphere at the measurement point, a moisture meter provided at the measurement point is housed in a box, and a dust collector is arranged adjacent to the upstream side of the box, and dust is collected. The pipe is branched and connected to the box, and the dust collector is operated to collect dust on the upstream side of the moisture meter. At the same time, the suction force acting on the box sucks the water vapor together with the dust collection in the box. A moisture measurement method for coal in a humidified coal facility, wherein moisture measurement is performed while removing the coal.
JP34733199A 1999-12-07 1999-12-07 Coal moisture measurement method in humidification equipment Expired - Fee Related JP3570314B2 (en)

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JP3570314B2 true JP3570314B2 (en) 2004-09-29

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KR101406388B1 (en) * 2012-02-22 2014-06-16 주식회사 포스코 Apparatus for measuring water content of coal

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