JPH07190826A - Apparatus for measuring flow rate of particle - Google Patents
Apparatus for measuring flow rate of particleInfo
- Publication number
- JPH07190826A JPH07190826A JP33085493A JP33085493A JPH07190826A JP H07190826 A JPH07190826 A JP H07190826A JP 33085493 A JP33085493 A JP 33085493A JP 33085493 A JP33085493 A JP 33085493A JP H07190826 A JPH07190826 A JP H07190826A
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- flow rate
- pressure loss
- pipe
- coal
- 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.)
- Granted
Links
- 239000002245 particle Substances 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 abstract description 92
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 101001034843 Mus musculus Interferon-induced transmembrane protein 1 Proteins 0.000 description 1
- -1 bark Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、微粉炭焚きボイラの微
粉炭管内を空気搬送される微粉炭、スラッジ、バーク、
ソーダスト焚きボイラの燃料、ボイラの火炉内に投入さ
れる炉内脱硫用石灰石など気流搬送される粒子の流量計
測に適用される粒子の流量計測装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pulverized coal, sludge, bark, which is pneumatically conveyed in a pulverized coal pipe of a pulverized coal burning boiler.
The present invention relates to a particle flow rate measuring device applied to flow rate measurement of particles such as fuel of a soot-dust-fired boiler and limestone for in-furnace desulfurization introduced into a furnace of a boiler.
【０００２】[0002]
【従来の技術】従来、微粉炭焚きボイラの微粉炭管内を
空気搬送される微粉炭の流量は、ミルの上流に位置して
重量式または容積式などの計量器を具えた給炭機により
計測されている。ミルを出た微粉炭は各バーナまでそれ
ぞれの微粉炭管内を空気搬送されており、予め計算によ
り各微粉炭管内における圧力損失が均等となるようにオ
リフィス等を設置して微粉炭の流量がそれぞれのバーナ
に均等に配分されるようになっている。2. Description of the Related Art Conventionally, the flow rate of pulverized coal which is pneumatically conveyed in a pulverized coal pipe of a pulverized coal burning boiler is measured by a coal feeder provided upstream of a mill and equipped with a weighing-type or volume-type measuring instrument. Has been done. The pulverized coal leaving the mill is air-transferred to each burner in each pulverized coal pipe, and the flow rate of the pulverized coal is adjusted by previously setting an orifice etc. so that the pressure loss in each pulverized coal pipe is equalized. The burners are distributed evenly.
【０００３】[0003]
【発明が解決しようとする課題】上記のように、微粉炭
焚ボイラにおいて微粉炭管内を空気搬送される微粉炭の
流量はミルの上流に位置して重量式または容積式などの
計量器を具えた給炭機により計測されているが、誤差が
大きいうえに給炭機で計測された石炭がミルを経てバー
ナに至るまでには多少の時間が費かるため、計測値と実
際値とでは時間的にずれを生じる不具合がある。また、
ミルを出て複数の微粉炭管内を空気搬送される微粉炭の
流量が均等となるように予め各微粉炭管内の圧力損失を
計算してオリフィス等を設置しているが、実際に流れて
いる微粉炭の流量は確認することができないなどの不具
合がある。As described above, in the pulverized coal burning boiler, the flow rate of the pulverized coal which is pneumatically conveyed in the pulverized coal pipe is located upstream of the mill and equipped with a weighing or volumetric meter. However, it takes some time for the coal measured by the coal feeder to reach the burner after passing through the mill. There is a problem that causes a deviation. Also,
The orifice is installed by calculating the pressure loss in each pulverized coal pipe in advance so that the flow rate of the pulverized coal that is discharged from the mill and conveyed by air in multiple pulverized coal pipes is equalized, but it is actually flowing. There is a problem that the flow rate of pulverized coal cannot be confirmed.
【０００４】[0004]
【課題を解決するための手段】本発明に係る粒子の流量
計測装置は上記課題の解決を目的にしており、粒子を気
流搬送する搬送管の垂直部および水平部にそれぞれ設置
され上記搬送管内の単位距離間における圧力損失を計測
する圧力損失検出器と、該圧力損失検出器により計測さ
れたそれぞれの圧力損失の差に基づいて粒子の流量を演
算する手段とを備えた構成を特徴とする。A particle flow rate measuring device according to the present invention is intended to solve the above-mentioned problems, and is installed in a vertical portion and a horizontal portion of a conveying pipe for conveying particles in an air flow, respectively. The present invention is characterized by a pressure loss detector that measures a pressure loss between unit distances, and a unit that calculates a flow rate of particles based on a difference between the pressure losses measured by the pressure loss detector.
【０００５】[0005]
【作用】即ち、本発明に係る粒子の流量計測装置におい
ては、粒子を気流搬送する搬送管の垂直部および水平部
にそれぞれ設置された圧力損失検出器により搬送管内の
単位距離間における圧力損失が計測され計測されたそれ
ぞれの圧力損失の差に基づいて粒子の流量が演算される
ようになっており、垂直部においては粒子の重量が圧力
損失に加わるために仮に搬送管の垂直部と水平部とにお
けるそれぞれの圧力損失をΔＰv ，ΔＰh とすると、Δ
Ｐv −ΔＰh ＝γＨの式が成立つ。ここで、γは搬送管
内で浮遊状態における粒子の比重量(kg/m3) 、Ｈは圧力
損失を計測する単位距離である。この式により粒子の比
重量γが求まり、この比重量γに各搬送管において粒子
を搬送している気体の流量を乗じることにより各搬送管
内を搬送される粒子の流量が求まる。In other words, in the particle flow rate measuring device according to the present invention, the pressure loss per unit distance in the carrier pipe can be reduced by the pressure loss detectors installed at the vertical portion and the horizontal portion of the carrier pipe for carrying the air stream. The flow rate of particles is calculated based on the difference between the measured and measured pressure loss.In the vertical part, since the weight of particles adds to the pressure loss, the vertical and horizontal parts of the transfer pipe are temporarily assumed. Let ΔP v and ΔP h be the pressure losses at and, respectively.
The equation P v −ΔP h = γH holds. Here, γ is the specific weight (kg / m 3 ) of particles in a floating state in the carrier tube, and H is a unit distance for measuring the pressure loss. The specific weight γ of the particles is obtained from this equation, and the flow rate of the particles transported in each transport tube is determined by multiplying the specific weight γ by the flow rate of the gas transporting the particles in each transport tube.
【０００６】[0006]
【実施例】図１は本発明の一実施例に係る微粉炭の流量
計測装置の説明図である。図において、本実施例に係る
微粉炭の流量計測装置は微粉炭焚きボイラの微粉炭管内
を流れる微粉炭などの外、スラッジ、バーク、ソーダス
ト焚きボイラの燃料、ボイラの火炉内に投入される炉内
脱硫用石灰石など空気搬送される各種粒子の流量計測に
も利用できるもので、図に示すように微粉炭焚きボイラ
の石炭は給炭管６からミル１へ供給されてミル１で微粉
炭に粉砕され、搬送用空気により微粉炭管２ａ，２ｂ，
２ｃ，２ｄを通ってそれぞれのバーナ２へ送られるが、
バーナに至るまでの各微粉炭管２ａ〜２ｄに圧力損失を
計測するのに十分な長さの垂直部と水平部とが設けられ
ており、それぞれ等しい距離（Ｈ＝Ｌ）間の圧力損失を
求める垂直部の圧力損失検出器３と水平部の圧力損失検
出器４とが設置されている。そして、一例として微粉炭
管２ａの垂直部における圧力損失をΔＰvA、水平部にお
ける圧力損失をΔＰhAとすると、演算器５が得られた垂
直部と水平部とにおける圧力損失の差ΔＰvA−ΔＰhAを
計算し、垂直部の圧力損失ΔＰhAには微粉炭の重量が加
わっているので、ΔＰv −ΔＰh ＝γＨの式により浮遊
状態における微粉炭の比重量γA (kg/m3) を求め、この
比重量γA に微粉炭管２ａ内を流れる空気量ＧA (m3/h)
を乗じて単位時間に微粉炭管２ａ内を流れる微粉炭量Ｇ
CA(kg/h)を求める計算を行うようになっている。ただ
し、微粉炭の比重量γA は空気に比べて十分に大きいも
のとする。図における符号７は弁、８はオリフィスであ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a pulverized coal flow rate measuring device according to an embodiment of the present invention. In the figure, a pulverized coal flow rate measuring apparatus according to the present embodiment is a pulverized coal burning boiler outside the pulverized coal flowing in the pulverized coal pipe, sludge, bark, fuel of the sodust-fired boiler, a furnace charged into the furnace of the boiler. It can also be used to measure the flow rate of various air-borne particles such as limestone for internal desulfurization. As shown in the figure, coal from a pulverized coal-fired boiler is supplied from the coal feeding pipe 6 to the mill 1 and then pulverized into pulverized coal by the mill 1. Pulverized coal pipes 2a, 2b,
It is sent to each burner 2 through 2c and 2d.
Each of the pulverized coal pipes 2a to 2d up to the burner is provided with a vertical portion and a horizontal portion having a length sufficient to measure the pressure loss, and the pressure loss between equal distances (H = L) is measured. A vertical pressure loss detector 3 and a horizontal pressure loss detector 4 are installed. Assuming that the pressure loss in the vertical portion of the pulverized coal pipe 2a is ΔP vA and the pressure loss in the horizontal portion is ΔP hA as an example, the difference in pressure loss ΔP vA − between the vertical portion and the horizontal portion obtained by the calculator 5 is obtained. Since ΔP hA is calculated and the weight of pulverized coal is added to the pressure loss ΔP hA in the vertical portion, the specific weight of pulverized coal in a suspended state γ A (kg / m 3 by the equation ΔP v −ΔP h = γH ) Is obtained, and the air amount G A (m 3 / h) flowing in the pulverized coal pipe 2a is calculated based on the specific weight γ A.
Multiply by the amount of pulverized coal flowing in the pulverized coal pipe 2a per unit time G
It is designed to calculate CA (kg / h). However, the specific weight γ A of pulverized coal is sufficiently larger than that of air. In the figure, reference numeral 7 is a valve, and 8 is an orifice.
【０００７】微粉炭管２ａ内における浮遊状態の微粉炭
の比重量γA (kg/m3) 、微粉炭管２ａ内を流れる微粉炭
量ＧCA(kg/h)はそれぞれ次式で表わされる。The specific weight γ A (kg / m 3 ) of the pulverized coal in a floating state in the pulverized coal pipe 2a and the amount of pulverized coal flowing in the pulverized coal pipe 2a G CA (kg / h) are respectively expressed by the following equations. .
【０００８】γA ＝（ΔＰvA−ΔＰhA）／Ｈ ＧCA＝γA ×ＧA 従って、ミル１への石炭投入量ＧTC(kg/h)は ＧTC＝ＧCA＋ＧCB＋ＧCC＋ＧCD で得られる。ここで、ＧCB，ＧCC，ＧCDはそれぞれ微粉
炭管２ｂ，２ｃ，２ｄ内を流れる微粉炭量(kg/h)であ
る。Γ A = (ΔP vA −ΔP hA ) / HG CA = γ A × G A Therefore, the amount of coal input G TC (kg / h) to the mill 1 is G TC = G CA + G CB + G CC + G Obtained on CD . Here, G CB , G CC , and G CD are the amounts (kg / h) of pulverized coal flowing in the pulverized coal pipes 2b, 2c, and 2d, respectively.
【０００９】なお、微粉炭管２ａ〜２ｄ内を流れる個々
の空気量を計測していない場合には、ミル１入口に設置
されている搬送用空気の流量計９により計測される空気
量Ｃ TKから求めることもできる。即ち、各微粉炭管２ａ
〜２ｄ内を流れる空気量ＧKA〜ＧKDは次式で求まる。It should be noted that the individual flowing in the pulverized coal pipes 2a to 2d
Installed at the mill 1 inlet when the air volume is not measured
Measured by the flow meter 9 for the transporting air
Quantity C TKYou can also ask from. That is, each pulverized coal pipe 2a
Air volume G flowing in ~ 2dKA~ GKDIs calculated by the following formula.
【００１０】[0010]
【数１】 [Equation 1]
【００１１】ここで、ΔＰvA，ΔＰvB，ΔＰvC，ΔＰvD
はそれぞれ微粉炭管２ａ〜２ｄの垂直部における圧力損
失である。また、ΔＰhA，ΔＰhB，ΔＰhC，ΔＰhDはそ
れぞれ微粉炭管２ａ，２ｂ，２ｃ，２ｄの水平部におけ
る圧力損失である。これら一連の計算も演算器５により
行われる。Here, ΔP vA , ΔP vB , ΔP vC , and ΔP vD
Are pressure losses in the vertical portions of the pulverized coal pipes 2a to 2d, respectively. Further, ΔP hA , ΔP hB , ΔP hC , and ΔP hD are pressure losses in the horizontal portions of the pulverized coal pipes 2a, 2b, 2c, 2d, respectively. These series of calculations are also performed by the calculator 5.
【００１２】従来は、微粉炭焚きボイラにおいて微粉炭
管内を空気搬送される微粉炭の流量はミルの上流に位置
して重量式または容積式などの計量器を具えた給炭機に
より計測されているが、誤差が大きいうえに給炭機で計
測された石炭がミルを経てバーナに至るまでには多少の
時間が費かるため、計測値と実際値とでは時間的にずれ
を生じる不具合がある。また、ミルを出て複数の微粉炭
管内を空気搬送される微粉炭の流量が均等となるように
予め各微粉炭管内の圧力損失を計算してオリフィス等を
設置しているが、実際に流れている微粉炭の流量は確認
することができないなどの不具合がある。これらに対し
て、本微粉炭の流量計測装置においては微粉炭を定常的
に比較的希薄な状態（固気比が０．２乃至１の範囲）で
空気搬送する微粉炭管２ａ〜２ｄの垂直部と水平部とに
おける一定距離間の圧力損失を計測し、これらの圧力損
失の差を求めることによりそれぞれの微粉炭管２ａ〜２
ｄ内を流れる微粉炭の流量が求まるようになっている。
即ち、微粉炭管２ａ〜２ｄの垂直部における圧力損失に
は微粉炭の重量が加わるので、微粉炭管２ａ〜２ｄの垂
直部と水平部とにおけるそれぞれの圧力損失をΔＰv ，
ΔＰh とすると、ΔＰv −ΔＰh ＝γＨの関係がある。
ただし、γは微粉炭管２ａ〜２ｄ中における浮遊状態の
微粉炭の比重量(kg/m3) 、Ｈは垂直部における圧力損失
の計測距離である。上記の式から微粉炭の比重量γが求
まり、この微粉炭を搬送している搬送空気の流量を乗じ
ることにって微粉炭管２ａ〜２ｄ内を流れる微粉炭の流
量を求めることができる。これにより、微粉炭の流量を
より正確に、リアルタイムに計測することが可能であ
る。また、ミル１から複数本出ている微粉炭管２ａ〜２
ｄそれぞれにおける微粉炭の流量を正確に計測すること
ができ、各バーナ２への流量アンバランスを確認して必
要に応じて弁７により微粉炭の流量を調整することがで
きる。Conventionally, in a pulverized coal burning boiler, the flow rate of pulverized coal which is air-conveyed in a pulverized coal pipe is measured upstream of the mill by a coal feeder equipped with a weighing or volumetric meter. Although there is a large error, it takes some time for the coal measured by the coal feeder to reach the burner after passing through the mill. . In addition, the pressure loss in each pulverized coal pipe is calculated in advance so that the flow rate of the pulverized coal that is air-conveyed in the pulverized coal pipes from the mill is equalized. There is a problem such as not being able to confirm the flow rate of pulverized coal. On the other hand, in the present pulverized coal flow rate measuring device, the vertical direction of the pulverized coal pipes 2a to 2d which constantly convey the pulverized coal in a relatively dilute state (solid-gas ratio is in the range of 0.2 to 1). Of the pulverized coal pipes 2a to 2 by measuring the pressure loss between the horizontal part and the horizontal part for a certain distance and determining the difference between these pressure losses.
The flow rate of the pulverized coal flowing in d is obtained.
That is, since the weight of pulverized coal is added to the pressure loss in the vertical portion of the pulverized coal pipes 2a to 2d, the pressure loss in each of the vertical portion and the horizontal portion of the pulverized coal pipes 2a to 2d is ΔP v ,
Letting ΔP h be the relation of ΔP v −ΔP h = γH.
Here, γ is the specific weight (kg / m 3 ) of the pulverized coal in a floating state in the pulverized coal pipes 2a to 2d, and H is the measurement distance of the pressure loss in the vertical portion. The specific weight γ of the pulverized coal is obtained from the above equation, and the flow rate of the pulverized coal flowing in the pulverized coal pipes 2a to 2d can be obtained by multiplying the flow rate of the carrier air conveying the pulverized coal. This makes it possible to measure the flow rate of pulverized coal more accurately and in real time. In addition, a plurality of pulverized coal pipes 2a to 2 coming out from the mill 1
The flow rate of pulverized coal in each d can be accurately measured, the flow rate imbalance to each burner 2 can be confirmed, and the flow rate of pulverized coal can be adjusted by the valve 7 if necessary.
【００１３】[0013]
【発明の効果】本発明に係る粒子の流量計測装置は前記
のように構成されており、搬送管の垂直部と水平部とに
おけるそれぞれの圧力損失の差と各搬送管において粒子
を搬送している気体の流量とから各搬送管内を搬送され
る粒子の流量が求まるので、各搬送管における粒子の流
量をより正確にリアルタイムに計測することが可能にな
る。The particle flow rate measuring device according to the present invention is constructed as described above, and the difference in pressure loss between the vertical portion and the horizontal portion of the transport pipe and the transport of the particles in each transport pipe are performed. Since the flow rate of particles transported in each transport pipe is obtained from the flow rate of the gas in the transport pipe, the flow rate of particles in each transport pipe can be measured more accurately in real time.
【図１】図１は本発明の一実施例に係る微粉炭の流量計
測装置のフロー系統図である。FIG. 1 is a flow system diagram of a pulverized coal flow rate measuring device according to an embodiment of the present invention.
１ ミル ２ バーナ ２ａ 微粉炭管 ２ｂ 微粉炭管 ２ｃ 微粉炭管 ２ｄ 微粉炭管 ３ 圧力損失検出器 ４ 圧力損失検出器 ５ 演算器 ６ 給炭管 ７ 弁 ８ オリフィス ９ 流量計 1 mil 2 burner 2a pulverized coal pipe 2b pulverized coal pipe 2c pulverized coal pipe 2d pulverized coal pipe 3 pressure loss detector 4 pressure loss detector 5 calculator 6 coal feeding pipe 7 valve 8 orifice 9 flow meter
Claims (1)
び水平部にそれぞれ設置され上記搬送管内の単位距離間
における圧力損失を計測する圧力損失検出器と、該圧力
損失検出器により計測されたそれぞれの圧力損失の差に
基づいて粒子の流量を演算する手段とを備えたことを特
徴とする粒子の流量計測装置。1. A pressure loss detector that is installed in each of a vertical portion and a horizontal portion of a conveying pipe that conveys particles by air flow and that measures a pressure loss between unit distances in the conveying pipe, and a pressure loss detector that measures the pressure loss. A particle flow rate measuring device, comprising: means for calculating a particle flow rate based on a difference between respective pressure losses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33085493A JP3396281B2 (en) | 1993-12-27 | 1993-12-27 | Particle flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33085493A JP3396281B2 (en) | 1993-12-27 | 1993-12-27 | Particle flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07190826A true JPH07190826A (en) | 1995-07-28 |
| JP3396281B2 JP3396281B2 (en) | 2003-04-14 |
Family
ID=18237277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33085493A Expired - Lifetime JP3396281B2 (en) | 1993-12-27 | 1993-12-27 | Particle flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3396281B2 (en) |
-
1993
- 1993-12-27 JP JP33085493A patent/JP3396281B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3396281B2 (en) | 2003-04-14 |
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