JP2797856B2 - Flow measuring method and measuring apparatus of high concentration powder which is transported by the transport medium in the tube - Google Patents

Flow measuring method and measuring apparatus of high concentration powder which is transported by the transport medium in the tube

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JP2797856B2
JP2797856B2 JP23472192A JP23472192A JP2797856B2 JP 2797856 B2 JP2797856 B2 JP 2797856B2 JP 23472192 A JP23472192 A JP 23472192A JP 23472192 A JP23472192 A JP 23472192A JP 2797856 B2 JP2797856 B2 JP 2797856B2
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JPH0682288A (en )
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聰 松井
進市 磯崎
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日本鋼管株式会社
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【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は管内を搬送媒体により搬送される高濃度粉体の流量測定方法及びその測定装置に関するものである。 The present invention relates to relates to a flow measuring method and measuring apparatus of high concentration powder which is transported by the transport medium in the tube.

【0002】 [0002]

【従来の技術】従来粉体の流量測定方法及びその測定装置については、光透過方式の粉体濃度計を利用したものが知られている。 For Conventional powder flow rate measuring method and measuring apparatus, which utilizes a powder densitometer light transmission system is known. 図7に一例を示す。 Figure 7 shows an example. 図7において、粉体搬送管1に相対する二つの観察窓2を設置する。 7, placing the two opposite viewing window 2 to the powder transfer pipe 1. 一方の観察窓2から光源体3から発する平行光束4を入射し、粉体移送管1内に入射する。 The parallel light beam 4 emitted from one of the observation window 2 from light source 3 is incident, and enters the powder transfer tube 1. 入射した光は粉体7によって減衰し、残りの透過光を他方の観察窓2から取出し、光検出器5に導入して、透過光量を検出する。 The incident light attenuated by the powder 7, taken out the rest of the transmitted light from the other observation window 2, is introduced to the optical detector 5 detects the amount of transmitted light. ここで、入射光強度Io が粒子群を通過し、透過光強度Iに減衰する場合、透過率I/Io は数式1のランベルトベア則によって表される。 Here, the incident light intensity Io passes through the particles, to attenuate the transmitted light intensity I, the transmittance I / Io is represented by Lambert bare law equation 1.

【0003】 [0003]

【数1】 [Number 1]

【0004】透過率(I/Io )を測定することにより、粒子濃度(φ m )が求まり、更に粒子の移動速度が搬送媒体(ガス)流速に等しいと仮定して、粒子濃度値と搬送媒体平均流速値の積から粉体流量値を算出する。 [0004] By measuring the transmittance (I / Io), Motomari the particle concentration (phi m), assuming that the moving velocity of the further particles is equal to the transport medium (gas) flow rate, particle density value and the transport medium It calculates the powder flow rate value from the product of the mean flow velocity value.

【0005】 [0005]

【発明が解決しようとする課題】然しながら、上述した光透過方式による粉体濃度計による測定においては、測定可能粉体最大濃度が制約されるため、高濃度粉体測定に適用する場合には、粉体移送管から搬送媒体(ガス) [SUMMARY OF THE INVENTION] However, in the measurement by the powder densitometer by light transmission method described above, since the measurable powder maximum concentration is constrained, when applied to high density powder measurement, conveying medium from the powder transfer tube (gas)
を等速吸引したり、あるいは分岐管を設けたりして、一部分の粒子をサンプリングして、測定する必要がある。 Or sucked constant speed, or by or provided a branch pipe, by sampling a portion of the particles, it is necessary to measure.
この様な改良した方式によっても、実用化されているダスト濃度計の最大粉体濃度は200gr/m 3程度であり、 Even by such improved methods, the maximum powder density of the dust concentration meter in practical use is about 200gr / m 3,
それ以上の高濃度粒子群に対しては光が減衰してしまうために、光透過式を適用して高濃度粉体流量を測定することは困難であった。 For light is attenuated with respect to more high density particles, it has been difficult to apply a light transmission type measuring high density powder flow rate.

【0006】本発明は上記のような問題点を解決するために成されたものであり、高濃度領域の粉体濃度測定を可能にし、粉体流量をオンラインで測定出来る方法及びその装置を提供することを目的とする。 [0006] The present invention has been made to solve the above problems, allowing the powder density measurement of the high-concentration region, provides a method and apparatus can measure the powder flow rate in line an object of the present invention is to.

【0007】 [0007]

【課題を解決するための手段】上記の目的を達成するために、本発明は粉体が搬送媒体により搬送される管内に、一定の長さで軸芯が該管と平行する内管を設け、その内管の軸芯に直交する線上に対向する内管壁の開口部に固定しで対向するように配設された光透過用測定管を介して、光を透過させ、その透過率を測定し、それから粉体平均濃度値を算出し、その算出値と前記搬送媒体の流速値との乗算値から粉体流量値を算出することを特徴とする管内を搬送媒体により搬送される高濃度粉体の流量測定方法である。 To achieve the above object of the Invention The present invention is in the tube to which the particles are transported by the transport medium, provided the inner tube axis is parallel to the tube at a constant length , via the light-transmission measurement pipe arranged so as to face in the fixed to the opening of the inner tube wall facing the line orthogonal to the axis of the inner tube, to transmit light, the transmittance measured, then calculates the powder average density value, a high concentration which is transported by the transport medium in the tube, characterized in that to calculate the powder flow rate value from the multiplication value of the flow velocity value of the carrier medium and the calculated value powder is a flow measurement method.

【0008】上記本発明方法に適した測定装置として、 [0008] As measurement devices suitable for the present invention method,
軸芯に直交する線上に位置して対向させた開口部を有する管と、その管内に、一定の長さで軸芯が該管と平行するように設けられた内管と、前記開口部に挿入され、該内管の軸芯に直交する線上に対向する内管壁の開口部に固定して対向するように配設された光透過用測定管と、 A tube having an opening opposed to each other and located on a line perpendicular to the axis, to the tube, and the inner tube axis is provided to be parallel with the tube at a predetermined length, the opening is inserted, the inner tube for light transmission measurement pipe arranged so as to face fixed to the opening of the inner tube wall facing the line orthogonal to the axis of,
光透過用測定管に付設した先端間隔調節装置と、一方の測定管の後端部に配置された光束入射用の光源体と、他方の測定管の後端部に配置された光量検出端を具備した光透過率検出部と、搬送媒体の流速を測定する検出端と、それらの出力信号から粉体平均濃度値と媒体平均流速値とを各々算出し、これらを乗算し、粉体流量値を演算する装置を組合わせてなる管内を搬送媒体により搬送される高濃度粉体の流量測定装置とするものである。 A tip gap adjusting apparatus attached to the measuring tube for transmitting light, one of the measuring tube and light source of a light beam for incidence arranged at a rear portion of the light quantity detection end disposed at a rear end portion of the other of the measuring tube and the light transmission rate detection unit which is provided, a detection end for measuring the flow rate of the carrier medium, those of the powder mean density value and the media average flow velocity value of each calculated from the output signal, it multiplies, powder flow rate value it is an flow measuring device of the high-density powder which is transported by the transport medium in a pipe made of a combination of devices for computing a.

【0009】この場合、測定部での管は垂直管を使用し、同芯同軸の連続した断面で、その直径の6倍以上の長さのものとし、該管の粉体入側端から長さ方向の70 [0009] In this case, the tube in the measuring section uses a vertical tube, a continuous section of concentric coaxial, and that of more than 6 times the length of the diameter, length from the powder inlet end of the tube the direction of 70
〜80%の位置に開口部を設け、更に図4に示す内管径と長さの関係から内管寸法を決定し、透過用測定管を設置することが測定部での粉体の流れの均一性を保つ上で好ましい。 An opening is provided in the 80% position, further to determine the inner tube dimensions from the relationship of the inner pipe diameter and length shown in FIG. 4, to be placed transmissive measuring tube of the powder flow in the measurement section preferred in maintaining uniformity.

【0010】 [0010]

【作用】本発明は上記した構成で、管内に内管を設け、 DETAILED DESCRIPTION OF THE INVENTION The present invention in the above-mentioned configuration, the inner tube provided in the tube,
この内管の軸芯に直交する線上に位置する内管壁の開口部に固定した対向する光透過用測定管を介して、粉体に光を透過させるものであり、開口部から光透過用測定管を相対して挿入させて、測定部光路長を実際の粉体移送管径より小さくして、光透過量の減衰量を抑制する。 Through the opposing light transmitting measuring tube is fixed to the opening of the inner tube wall positioned on a line perpendicular to the axis of the inner tube, powder is intended for transmitting light, for transmitting light from the opening the measurement tube is inserted relative, the measurement unit optical path length and smaller than the actual powder transfer pipe diameter, suppresses the attenuation of the amount of light transmission.
叉、本発明の光源体としては、光強度の大きい平行光束が容易に実現可能なように、レーザ光のような連続光源体を用いることが出来る。 Or, as the light source of the present invention, as large parallel beam intensity is easily realized, it is possible to use a continuous light source such as a laser beam.

【0011】即ち、本発明者等は高粉体濃度の場合、透過光強度が上述した数式1から、小さくなるために、透過長さ(光路長)を小さくすることに着目して検討を行い、図3に示すような粉体平均濃度値と透過率(I/I [0011] That is, when the present inventors have Kokonatai concentration, from Equation 1 that the transmitted light intensity mentioned above, to be smaller, performs study focusing on that transmission length (optical path length) small , and the transmittance powder average density value, as shown in FIG. 3 (I / I
o )の関係を得て、上記発明に到達したものである。 To obtain the relationship between o), it is obtained by reaching the invention.

【0012】図3では硅砂5号(調和平均径(dp32)が0. [0012] Figure 3, Silica Sand No. 5 (the harmonic mean diameter (DP32) is 0.
34mm、粒子の真比重 (ρ) が2.58)の粉体を空気を搬送媒体として較正試験により求めた光透過率と粉体平均濃度値の関係を示す実施例の図である。 34 mm, illustrates an example embodiment showing a true specific gravity ([rho) is powder relationship between a light transmittance and powder average density value obtained by calibration test as a transport medium air of 2.58) particles.

【0013】ここでは垂直管の内径をDとし、内管に固定した光透過用測定管の先端間隔即ち透過長さ(測定部光路長)をLとし、D>Lの範囲で、Lを種々に変化させてプロットし、粉体平均濃度値と透過率(I/Io ) [0013] Here, the inner diameter of the vertical pipe is D, the tip spacing or transmission length of the optical transmission measurement tube fixed to the inner tube (measurement portion optical path length) is L, the range of D> L, variously L varied plotted on a powder the average density value and the transmittance (I / Io)
の関係を得たものである。 It is intended to obtain a relationship. Lが小さい程、透過光強度(I)が増大している。 As L is smaller, the transmitted light intensity (I) is increased. ここでは3kg/m 3程度までの測定が可能であることを示している。 It shows that here it is possible to measure up to about 3 kg / m 3. 比較として、図7に示すような測定装置を用いた場合、点線で示すように0.2kg/m 3程度までしか測定できなかった。 As a comparison, a case of using a measuring device as shown in FIG. 7, could not be measured only to about 0.2 kg / m 3 as indicated by the dotted line.

【0014】この場合、光透過用測定管を取付ける内管は搬送管内に挿入した光透過用測定管によって、管内の粉体流れに乱れが生じることを防止するために、設けられたものである。 [0014] In this case, the inner tube for attaching the light transmitting measuring tube by a light-transmitting measuring tube inserted into the conveying pipe, in order to prevent the occurrence of disturbance in the powder flow tube, and is provided . 上記の作用によって、内管内部の媒体の流速及び粉体濃度は搬送管全断面積における媒体の流速及び粉体濃度を正しく代表することが出来るので、内管内の粉体濃度を測定することによって、搬送管の断面全体の粉体濃度を精度良く把握することが出来る。 By the above action, the flow rate and powder density of the medium in the inner tube portion can be properly representative of the flow rate and powder density of the medium in the total cross-sectional area conveying pipe, by measuring the powder density of the inner tube , it is possible to accurately grasp the powder density of the entire cross-section of the conveying pipe.

【0015】更にこの内管の粉体濃度値に搬送管内の媒体平均流速値を乗算して、搬送粉体流量値を求めることが出来る。 Furthermore by multiplying the medium average flow velocity value of the transport pipe to the powder density value of the inner tube, it is possible to determine the entrained powder flow rate value. 今回の実験で使用したレーザーの光源体では、透過率0.15以上にすることが、粉体密度の測定精度を向上させるために必要であった。 The light source of the laser used in this experiment, that the above transmittance 0.15 was required in order to improve the measurement accuracy of the powder density. しかし、光量検出端の性能を向上させることによって、透過率を更に小さく出来る。 However, by improving the performance of the light quantity detection end, transmittance can be further reduced.

【0016】本発明では実際の粉体流量測定において、 [0016] In actual powder flow rate measurement in the present invention,
粉体が粒子径が異なり、粒子の種類が異なる所謂混粒状態にあるので、図3を基にして、図5に示すような透過率と測定条件の関係式を用いて、光量検出端の出力信号から本発明の演算装置により算出して粉体平均濃度値を求める。 Powder different particle size, since the types of particles are in different so-called mixed grain state, based on FIG. 3, by using the relational expressions transmittance measurement conditions shown in FIG. 5, the light quantity detection end calculated by the arithmetic unit of the present invention from the output signal obtaining the powder average density value.

【0017】図5は図1、図2の測定装置を用いた場合の透過率(I/Io )と測定条件の関係を示す図で粉体として硅砂2種と、鉄鉱石を用いた較正試験により得られたものである。 FIG. 5 is a calibration test using FIG 1, a silica sand two as powder a diagram showing a relation of the transmittance (I / Io) and the measurement conditions in a measuring device of FIG. 2, iron ore it is obtained by. 図5から明らかなように、粉体粒径が異なっても、粒子真比重(ρ)を考慮することによって、透過率(I/Io )が一つの較正直線上に一致して測定することが出来た。 As is apparent from FIG. 5, even different powder particle size, by considering the particle true specific gravity ([rho), it is the transmittance (I / Io) is measured consistent with one calibration straight line done. このことから本発明では粉体粒径、粉体種類が混粒していても測定が可能であることを得た。 Powder particle size in the present invention Therefore, the powder type was obtained that it is possible to measure also be mixed grain.

【0018】即ち、測定装置としてのLを特定し、被測定物の粉体の真比重(ρ)及び調和平均径(dp32) が取扱いプロセスの固有値として自明であることから、透過率(I/Io)を測定して、図5の直線から粉体平均濃度値(kg/m 3 )を一義的に求める。 [0018] That is, to identify the L as the measurement apparatus, since the true specific gravity ([rho) and the harmonic mean size of the powder of the object to be measured (DP32) is obvious as eigenvalues ​​of handling processes, the transmittance (I / by measuring io), uniquely determined powder average density value (kg / m 3) from the straight line of FIG. 一方、搬送媒体の流速を測定する検出端と、その出力信号から本発明の演算装置により媒体平均流速値を算出する。 On the other hand, a detection end for measuring the flow rate of the carrier medium, calculates a medium average flow velocity value by the arithmetical unit of the present invention from the output signal.

【0019】即ち、既存のピトー管による圧力の検出信号、又は熱線式流速検出端による温度の検出信号と媒体平均流速の一般的関係式を用いることにより、上記媒体平均流速値の算出が行われる。 [0019] That is, by using the general relation of the detection signal and the medium average flow velocity of the temperature by the detection signal, or hot-wire type flow rate detecting end of pressure due to existing pitot tube, the calculation of the medium average flow velocity value is performed . 更に上記粉体平均濃度値と媒体平均流速値とを本発明の演算装置により乗算することによって、粉体流量値を算出することが出来る。 Further the above powder average density value and the media average flow velocity value by multiplying by the arithmetic unit of the present invention, it is possible to calculate the powder flow rate value.

【0020】 [0020]

【実施例】以下に本発明の実施例を図によって説明する。 BRIEF DESCRIPTION by FIG embodiments of the present invention are described below. 図1、図2は本発明の一実施例を示す図であり、図1は本発明装置を設置した状態を示す図であり、図2は本発明の装置の光透過率検出部の要部を示す図である。 1, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 1 is a view showing an installed state of the present invention apparatus, Figure 2 is a main portion of the light transmission rate detection unit of the apparatus of the present invention is a diagram illustrating a.
図において、10は粉体流量計の光透過率検出部、11 In the figure, 10 is the light transmittance detection unit of the powder flowmeter 11
a、11bは光透過用測定管、12は先端間隔調節装置、13は流速検出端、21は内管である。 a, 11b is measuring tube for transmitting light, 12 the tip gap adjusting device, 13 is a flow rate detection end, 21 is the inner tube. 7は粉体の粒子である。 7 is a particle of the powder.

【0021】本発明の粉体流量の測定装置は、粉体が搬送媒体により搬送される配管系9内に設けた、軸芯に直交する線上に対向する管壁の開口部8a、8bを有する垂直管1と、その垂直管1内に設けた軸芯に直交する線上に対向する内管壁の開口部8c、8dを有する内管2 The powder flow rate measuring apparatus of the present invention has the powder is provided in the piping system 9 carried by the carrier medium, the tube wall of the opening 8a which faces the line orthogonal to the axis, the 8b inner tube 2 having a vertical tube 1, the openings 8c of the inner tube wall facing the line orthogonal to the axis provided on the vertical tube 1, the 8d
1と、前記開口部8a、8bに挿入して、内管21の開口部8c、8dに固定した光透過用測定管11a、11 1, the opening 8a, is inserted into 8b, the inner tube 21 opening 8c, the measuring tube 11a for transmitting light fixed to 8d, 11
bと、光透過用測定管11a、11bに付設した先端間隔調節装置12と、一方の測定管11aの後端部に配置した光束入射用の光源体3と、他方の測定管11bの後端部に配置した光量検出端5からなる光透過率検出部検出部10と、搬送媒体の流速を測定する流速検出端1 b and, for optical transmission measurements tube 11a, the tip spacing adjustment device 12 which is attached to 11b, the light source 3 of the light beam for incidence arranged to the rear end portion of one of the measuring tubes 11a, the rear end of the other of the measuring tube 11b a light transmittance detector detecting section 10 determined by the light intensity detection end 5 arranged in the part, the flow rate detection end 1 for measuring the flow rate of the carrier medium
3、及びそれらの検出端の出力信号から粉体平均濃度値と媒体平均流速値とを各々算出し、これらを乗算し、粉体流量値を演算する装置を組合わせてなるものである。 3, and calculates each of the powder mean density value and the media average flow velocity value from the output signals of the detection end, they multiply, it is made of a combination of devices for computing a powder flow rate value.

【0022】演算装置では光量検出端5と流速検出端1 The light quantity detection end 5 and a flow rate detection end 1 a computing device
3から各々測定値を信号に変換して演算装置14に送信し、演算部15で演算し、表示部16に粉体7の流量を表示させる。 3 converts the respective measurements to the signal transmitted to the arithmetic unit 14, and computed by the computing unit 15 to display the flow rate of the powder 7 on the display unit 16. 17は記憶部である。 17 is a storage unit. 粉体の流量は指令部18から、図示しない搬送媒体の流速調整機構、粉体供給機構等へ指示することによって、調節することが出来る。 The flow rate of powder from the instruction unit 18, the flow rate adjusting mechanism of the transfer medium (not shown), by instructing the powder supplying mechanism or the like, it can be adjusted. 上記では垂直管を配管直径の6倍の長さのものとし、粉体入側端から75%の位置に開口部を設けて、光透過用測定管を設置した。 In the above and the vertical tube from 6 times the length of the pipe diameter, from the powder inlet end provided with an opening 75 percent of the positions were established for light transmission measurement pipe.

【0023】叉、内管の長さl及び内直径dについてはLに基づきdを決定し、図4から定まるlの値を内管の長さとした。 [0023] or, to determine the d based on L for the length l and an inner diameter d of the inner tube, and the length of the inner tube the value of l determined from FIG. ここでは光源体3と、光量検出端5とには、光束を拡大、縮小するためにレンズ20を設けている。 Here, the light source 3, the light amount detection end 5, a larger light beam, is provided with a lens 20 to shrink. 光透過用測定管11a、11bは同一径のものを用い、同一軸芯になるように設置することが必要である。 Light transmitting measurement pipe 11a, 11b is used as having the same diameter, it is necessary to install so as to be coaxially core.
光束を正確に検出するためである。 In order to accurately detect the light beam. 叉、光束を正確に検出するために、観察窓( 透明ガラス)2、Oリング6等の気密機構が用いられている。 Or, in order to accurately detect the light beam, the observation window (transparent glass) 2, O-ring 6 or the like airtight mechanism is used. 更に光源体3と、光量検出端5等は外乱を防止するために、カバー19を設けている。 Further a light source 3, the light quantity detection end 5 and the like in order to prevent the disturbance, is provided with a cover 19.

【0024】本発明の装置を用いて、本発明方法を行う場合について説明する。 [0024] Using the apparatus of the present invention, it will be described for performing the method of the present invention. 粉体を搬送する配管系9内に設けた垂直管1に粉体を搬送媒体によって通過させる。 Powder into a vertical tube 1 provided in the piping system 9 for conveying the powder is passed through by the transport medium. ここでは垂直管1が配管系9内の配管と同心等断面積なので、測定部での流れの均一性が保たれているために、その中を通過する粉体濃度は配管系9内の粒子7の粉体濃度と同じである。 Here, since the vertical pipe 1 is a pipe concentric with such cross-sectional area of ​​the piping system 9, for uniformity of flow in the measuring portion is maintained, the powder density passing therethrough particles in the pipe system 9 7 is the same as the powder concentration.

【0025】光透過用測定管11a、11bは垂直管1 [0025] For the light transmission measurements tube 11a, 11b are vertical tube 1
の軸芯Cに直交する線E上に位置して対向させた開口部8a、8b及び内管21に直交して同一線上に位置して対向させた開口部8c、8dから挿入し、配設しているので、光透過用測定管11a、11bは同一径であり、 Located on the line E which is perpendicular to the axis C is inserted from the opposite opening portions 8a were, 8b and the inner tube 21 and orthogonal to the located on the same line opening 8c which are opposed, 8d of, disposed since it has to, for light transmission measurements tube 11a, 11b are the same size,
その軸芯が一致する。 Its axis to match. これによって、測定管11aの端部に接続した光束入射用の光源体3から入射された光束は平行光束4として、垂直管1内の粉体を直角に横切り、測定管11bを通過して光量検出端5で検出される。 Thus, as the light beam is parallel light beam 4 that is incident from the measurement pipe 11a light source 3 of the light beam for incidence connected to an end of, across the powder in the vertical tube 1 at a right angle, it passes through the measuring pipe 11b amount It is detected by the detecting end 5.

【0026】上記本発明の装置により一定の先端間隔(L)を設けた対向する測定管の一方から他方へ光を透過し、その透過光量の減衰を元の光の投光強度と比較して求め、内管内の粉体平均濃度値を算出する。 [0026] The above by the apparatus of the present invention transmits light from one to the other of the measuring tube opposite provided with a distal spacing (L), as compared to the projected light intensity of the original light attenuation of the transmitted light intensity calculated, to calculate the powder average density value of the inner tube. この場合、測定部の光路長(L)を実際の粉体搬送管径より小さくしているので、図5の粉体平均濃度と透過率から先端間隔を選定して、光透過量の減衰量を抑制することが出来る。 In this case, since the optical path length of the measuring section (L) is smaller than the actual powder transfer pipe diameter, to select a tip distance from the powder average density and transmittance of Figure 5, the light transmission quantity attenuation it can be suppressed. その結果、粉体の高濃度粒子群の粉体平均濃度値を正確に測定することが出来る。 As a result, the powder average density value of the high density particles of the powder can be measured accurately.

【0027】本発明では実際の粉体流量測定において、 [0027] In actual powder flow rate measurement in the present invention,
粉体が粒子径が異なり、粒子の種類が異なる所謂混粒状態にあるので、図3を基にして、図5に示すような透過率と測定条件の関係式を演算装置の記憶部17にあらかじめ記憶させ、演算部15で測定された光量検出端5の出力信号から粉体平均濃度値を算出する。 Powder different particle size, since the types of particles are in different so-called mixed grain state, based on FIG. 3, the storage unit 17 of the computing device a relational expression of the transmittance and the measurement conditions shown in FIG. 5 It is previously stored to calculate the powder average density value from the output signal of the light amount detection end 5 measured by the arithmetic unit 15.

【0028】一方、流速検出端13の出力信号から演算部15により媒体平均流速値を算出する。 On the other hand, the calculating section 15 from the output signal of the flow rate detecting end 13 calculates a medium average flow velocity value. ここではピトー管による圧力の検出信号と媒体平均流速値の一般的関係式を用いることにより、上記媒体平均流速値を算出する。 Here the use of a general equation of the detection signal and the medium average flow velocity value of the pressure by Pitot tube, calculates the medium average flow velocity value. 更に上記粉体平均濃度値と媒体平均流速値とを演算部15により乗算することによって、粉体流量値を算出する。 Further by multiplying by the powder mean density value and the media average velocity value and the calculation unit 15 calculates the powder flow rate value. これらの値は表示部16によって表示される。 These values ​​are displayed by the display unit 16.

【0029】本発明では内管を用いているが、垂直管の直径と測定管の直径の最適関係範囲としては次の数式2 [0029] While using the inner tube in the present invention, the following formula 2 as an optimum relationship range of the diameter of the measuring tube to the diameter of the vertical tube
によって決めることが出来る。 It can be determined by. これは次の理由によるものである。 This is due to the following reasons. 測定管の直径が太いと該垂直管内流の外乱になり測定に疑義がでる。 The diameter of the measuring tube doubt comes out in the measurement becomes a disturbance of the thick and the vertical pipe flow. 測定管の直径と粉体粒径の関係は測定管の直径が太いと検出値が安定する。 The diameter and the relationship of the powder particle diameter of the measuring tube detected value with a thick diameter of the measuring tube is stabilized.

【0030】 [0030]

【数2】 [Number 2]

【0031】本発明では光透過用測定管の先端間隔の最適範囲、即ち内管の内直径は次の理由によって決めることが出来る。 The optimum range of tip spacing for light transmission measurement pipe in the present invention, i.e., the inner diameter of the inner tube can be determined by the following reasons. 下限値については間隔が狭すぎると間の測定区間の流速分布が阻害されるので、その影響を受けない最小の間隔とする。 Since the flow velocity distribution of the measurement interval during the interval lower limit value is too narrow is inhibited, and the minimum distance is not affected. 一般には搬送管は1/10程度である。 Generally the conveying pipe is about 1/10. 上限値については間隔が広いと光透過量減衰が大きくなるので、光透過量減衰の許容出来る間隔とする。 The light transmission quantity attenuation interval upper limit value is large is increased, and acceptable spacing of the light transmission quantity attenuation.

【0032】本発明による内管の長さは光透過用測定管による粉体の流れの外乱を防止し、粉体流量を精度良く推定する見地から、内管の断面形状については垂直管の断面形状と相似でも、また円管状いずれでも良い。 The length of the inner tube according to the present invention prevents the disturbance of the flow of the powder by the light transmission measurement tube, the powder flow rate from accurately estimate to viewpoint, for the cross-sectional shape of the inner tube of the vertical pipe section even in shape and similar, also it may be either circular tube.

【0033】本発明のように内管にこれらの光透過用測定管を対向して固定することによって、配管の振動、熱膨張等に起因する二つの光透過用測定管の芯ずれによる光路の遮断等の事態も回避できるという利点も有する。 [0033] inner tube as in the present invention by fixing opposite these for light transmission measurement pipe, the pipe vibration, the optical path due to misalignment of the two light-transmission measurement tube due to thermal expansion or the like situation of blocking such also has the advantage of avoiding.

【0034】本発明方法によれば、条件として管長2.0 According to the present invention method, the pipe length condition 2.0
m、管径0.2 mの垂直管を配管系に配置し、垂直管の入側から75%の位置に設けた開口部から光透過用測定管を挿入して突出させ、内径0.1 m、長さ0.5 mの内管に固定して、粉体として硅砂5号(dp32=0.34mm,ρ=2.58) m, the vertical tubes of the tube diameter 0.2 m was placed in the piping system, to protrude from an opening provided from the entry side of the vertical tubes 75% position by inserting the light transmitting measuring tube, an inner diameter of 0.1 m, length and fixed to the inner tube of 0.5 m, silica sand No. 5 as a powder (dp32 = 0.34mm, ρ = 2.58)
を空気を媒体として流速20m/秒で搬送した場合、図6 If it was transported at a flow rate of 20 m / sec using air as the medium, FIG. 6
に示すような結果を得ることが出来た。 I was able to obtain the results as shown in FIG. 図6は粉体流量(トン/時間)と測定経過時間との関係を示す図である。 6 is a diagram showing the relationship between the measured elapsed time and the powder flow rate (tons / hour).

【0035】ここでは粉体濃度のサンプリング間隔を0. [0035] 0 the sampling interval of the powder concentration is here.
6 秒とし、粉体平均濃度値とガス流速値との乗算から、 And 6 seconds, the multiplication of a powder the average density value and the gas flow rate value,
粉体流量値を算出しプロットしたものである。 It is plotted to calculate the powder flow rate value. 上記結果から明らかなように、高濃度領域の粉体濃度測定によって、粉体流量をオンラインで測定することが出来る。 As apparent from the above results, the powder density measurement of the high-concentration region, can be measured powder flow online.

【0036】 [0036]

【発明の効果】本発明によれば、以下の効果が得られる。 According to the present invention, the following effects are obtained. 光透過用測定管を取付けた内管は搬送管内の粉体の流れの外乱を防止し、粉体濃度の検出、及び粉体流量値の測定精度を向上する。 Inner tube fitted with a light transmission measurement tube prevents disturbance of the flow of the powder transport tube, the detection of the powder density, and to improve the measurement accuracy of the powder flow rate value. 粉体濃度3kg/m 3迄の高濃度の測定が可能である。 It is possible to measure high concentrations of up to a powder concentration 3 kg / m 3. 高濃度粉体の多量搬送量の測定が可能である。 It is possible to measure a large amount conveyance amount of the high density powder. 内管にこれらの光透過用測定管を対向して固定することによって、配管の振動、熱膨張等に起因する二つの光透過用測定管の芯ずれによる光路の遮断等の事態も回避できる。 By fixing facing these light transmission measurement tube inner tube, vibration of the piping, also a situation of blocking or the like of the optical path due to misalignment of the two light-transmission measurement tube due to thermal expansion or the like can be avoided.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明装置を配管系に設置した状態を示す図である。 [1] The present invention apparatus is a diagram showing an installation state in the piping system.

【図2】本発明の装置の光透過率検出部の要部を示す図である。 2 is a diagram showing a main part of the light transmission rate detection unit of the apparatus of the present invention.

【図3】本発明の先端間隔を変化した場合の粉体平均濃度と透過率との関係を示す図である。 3 is a diagram showing the relationship between the powder average density in the case of changing the tip spacing of the present invention and the transmittance.

【図4】本発明の内管の長さと測定条件の関係を示す図である。 Is a diagram showing the relationship between the length and the measurement conditions of the inner tube of the present invention; FIG.

【図5】本発明の一実施例による透過率と測定条件の関係を示す図である。 5 is a diagram showing the relationship between the transmittance and the measurement conditions according to an embodiment of the present invention.

【図6】本発明の一実施例による粉体流量と測定経過時間との関係を示す図である。 6 is a diagram showing the relationship between the powder flow rate and the measured elapsed time in accordance with an embodiment of the present invention.

【図7】従来の光透過方式粉体濃度計の一例を示す図である。 7 is a diagram showing an example of a conventional optical transmission schemes powder densitometer.

【符号の説明】 DESCRIPTION OF SYMBOLS

10 粉体流量計の光透過率検出部 11a,11b 光透過用測定管 12 先端間隔調節装置 13 流速検出端 14 粉体流量計の演算装置 21 内管 10 powder flowmeter light transmittance detection unit 11a, the arithmetic unit 21 within tube 11b light transmission measurement tube 12 distal spacing adjustment device 13 flow rate detecting end 14 powder flowmeter

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl. 6 ,DB名) G01F 1/74 ────────────────────────────────────────────────── ─── of the front page continued (58) investigated the field (Int.Cl. 6, DB name) G01F 1/74

Claims (2)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】 粉体が搬送媒体により搬送される管内に、一定の長さで軸芯が該管と平行する内管を設け、その内管に固定して対向するように配設された光透過用測定管を介して、光を透過させ、その透過率を測定し、それから粉体平均濃度を算出し、その算出値と前記搬送媒体の流速値とから粉体流量を算出することを特徴とする管内を搬送媒体により搬送される高濃度粉体の流量測定方法。 The tube 1. A powder is conveyed by the conveying medium, the axis at a certain length of the inner tube provided in parallel with the tube, is disposed so as to face fixed to the inner tube via a light transmission measurement pipe transmits light, that the transmittance was measured, then calculates the powder average density, calculates the powder flow rate from the flow rate value of the carrier medium and the calculated value method for measuring the flow rate of a high-concentration powder conveyed through the tube, characterized by a conveying medium.
  2. 【請求項2】 軸芯に直交する線上に位置して対向させた管壁の開口部を有する管と、その管内に、一定の長さで軸芯が該管と平行するように設けられた内管と、前記開口部に挿入され、該内管の軸芯に直交する線上に対向する内管壁の開口部に固定して対向するように配設された光透過用測定管と、光透過用測定管に付設した先端間隔調節装置と、一方の測定管の後端部に配置された光束入射用の光源体と、他方の測定管の後端部に配置された光量検出端を具備した光透過率検出部と、搬送媒体の流速を測定する検出端と、それらの出力信号から粉体平均濃度と媒体平均流速とを各々算出し、これらを乗算し、 A tube having a wherein wall openings opposed to each other located on a line perpendicular to the axis, to the tube, the axis in the predetermined length is provided to be parallel with the tube an inner tube is inserted into the opening, and the inner tube for light transmission measurement pipe arranged so as to face fixed to the opening of the inner tube wall facing the line orthogonal to the axis of the light comprising a tip gap adjustment device annexed for transparent measuring tube, one of the measuring tube and light source of a light beam for incidence arranged at a rear portion of the light quantity detection end disposed at a rear end portion of the other of the measuring tube and the light transmission rate detection unit that, the detection end for measuring the flow rate of the carrier medium, respectively calculates the powder average density and medium average flow velocity from these output signals, multiplies them,
    粉体流量を演算する装置を組合わせてなる管内を搬送媒体により搬送される高濃度粉体の流量測定装置。 Flow measuring device of the high density powder in a pipe made of a combination of devices for computing a powder flow rate is conveyed by the conveying medium.
JP23472192A 1992-09-02 1992-09-02 Flow measuring method and measuring apparatus of high concentration powder which is transported by the transport medium in the tube Expired - Fee Related JP2797856B2 (en)

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