JP3736723B2 - Flow rate adjustment method for fluid flowing through multiple lines - Google Patents

Description

この例の調整量は、符号＋が流量を増加させる方向の調整、−が流量を減少させる方向に調整であり、数値はそれらの方向における調整量に対応するものである。
このような調整量に基づき、流量計６の指示値を見ながら、各流量調整弁４（４ａ，４ｂ，…，４ｎ）を調整して、流量計６の指示値が、調整量だけ変化した時点で、その個別ラインにおける調整が完了する。
例えば、ライン１ａでは、流量計６の指示値が＋３．８になるまで流量調整弁を調整する。他のラインについても同様である。
【００１０】
図２は、以上の調整量により、個別ライン１ａから１ｂまで各流量調整弁４を順次調整した場合の夫々の流量の変化を示すものであり、このことから本発明を適用することにより、各個別ラインの流量のばらつきを低減し得ることがわかる。
例えば、この図２に示す調整では、流量のばらつきを５．８％程度まで低減させることができた。
【００１１】
【発明の効果】
本発明は以上のとおり、複数の個別ラインに流れる流体を合流させて合流ラインに流す構成の流体移送ラインにおいて、流量計は、各個別ライン毎に設けずに、合流ラインにのみ設けるので、流量計の設置数を大幅に削減でき、設備費を大幅に削減できるという効果がある。
【図面の簡単な説明】
【図１】 本発明の方法を適用する流体移送ラインの構成を概念的に示す系統図である。
【図２】 本発明により流量の調整を行った結果を示すものである。
【図３】 従来の方法を適用する流体移送ラインの構成を概念的に示す系統図である。
【符号の説明】
１（１ａ，１ｂ，…，１ｎ） 個別ライン
２ 合流ライン
３（３ａ，３ｂ，…，３ｎ） 流量計
４（４ａ，４ｂ，…，４ｎ） 流量調整弁
５（５ａ，５ｂ，…，５ｎ） 開閉弁（ライン元弁）
６ 流量計[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for adjusting the flow rate of fluid flowing through a plurality of lines.
[0002]
[Prior art]
For example, as shown in FIG. 2, there is a fluid transfer line having a configuration in which fluids flowing through a plurality of individual lines 1 (1 a, 1 b,. As an example of the fluid transfer line having such a configuration, for example, there is a line in which gases extracted from a distillation tower constituted by a plurality of columns are joined and transferred.
In such a fluid transfer line, the flow rate flowing through all the individual lines 1 (1a, 1b,..., 1n) may be adjusted uniformly. In this case, it is necessary to measure the flow rate for every individual line. is there.
Therefore, conventionally, a flow meter 3 (3a, 3b,..., 3n) and a flow rate adjusting valve 4 (4a, 4b,..., 3n) for each individual line 1 (1a, 1b,. 4n), and the flow rate is measured for each individual line 1 (1a, 1b,..., 1n) by these flow meters 3 (3a, 3b,..., 3n), and the respective measured values become uniform. Thus, the flow rate is adjusted by the flow rate adjusting valve 4 (4a, 4b,..., 4n).
Each individual line 1 (1a, 1b, ..., 1n) is provided with a line original valve 5 (5a, 5b, ..., 5n) as an on-off valve.
[0003]
[Problems to be solved by the invention]
In the conventional flow rate measurement and adjustment method as described above, a flow meter is installed for each of a plurality of individual lines, which increases the cost.
The present invention aims to solve such problems.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, in the fluid transfer line configured to join the fluid flowing in a plurality of individual lines and flow to the joining line, each individual line is provided with an opening / closing valve and a flow rate adjusting valve, A flow meter is installed in the line, and the open / close valves of each individual line are closed one by one, and the variation in the flow rate for each individual line is determined by the amount of decrease in the indicated value of the flow meter at that time. The present invention proposes a method for adjusting the flow rate of fluid flowing through a plurality of lines for adjusting the flow rate adjustment valves of the individual lines so as to eliminate variations.
[0005]
And in this invention, in said structure, it calculates | requires the fall of the flow volume for each individual line, and the deviation with those average values, and proposes setting the adjustment amount of a flow regulating valve according to deviation.
[0006]
In the above configuration, when the on / off valve of any one individual line is closed, the flow rate of the fluid flowing through the merge line decreases corresponding to the flow rate flowing through the individual line.
Therefore, when the opening / closing valves of each individual line are closed one by one and the flow rate drop of the flowmeter that occurs at that time is measured, the ratio of the flow rate flowing through each individual line can be estimated from the variation in the drop width. .
For this reason, the difference between the flow rate drop for each individual line and the average value of them is obtained, and the adjustment amount of the flow rate adjustment valve is set according to the deviation. The flowing flow rate can be adjusted in a uniform direction.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a system diagram conceptually showing the configuration of a fluid transfer line to which the present invention is applied. The same components as those in FIG. 2 showing the conventional configuration are denoted by the same reference numerals.
That is, the fluid transfer line to which the present invention is applied is a fluid transfer line configured to join the fluid flowing through the plurality of individual lines 1 (1a, 1b,. 1n) is provided with an on-off valve 5 (5a, 5b,..., 5n) and a flow rate adjusting valve 4 (4a, 4b,..., 4n), and a flow meter 6 is installed in the merging line. There is no flow meter installed for each individual line 1 (1a, 1b,..., 1n).
[0008]
In the above configuration, in the present invention, the on-off valves 5 (5a, 5b,..., 5n) of the individual lines 1 (1a, 1b,. , .DELTA.Fn, the flow rate variation of each individual line 1 (1a, 1b,..., 1n) is obtained, and each individual line 1 (1a is set so as to eliminate the flow rate variation. , 1b,..., 1n) of the flow rate adjusting valve 4 (4a, 4b,.
[0009]
That is, the deviation between the respective decrease widths ΔFa, ΔFb,..., ΔFn of the indicated value of the flow meter 6 and the average value ΔF thereof is obtained, and the flow rate adjusting valves 4 (4a, 4b) are calculated based on this deviation. ,..., 4n) are set.
[0010]
For example, the following shows a specific example of the decrease width and the adjustment amount when six individual lines are provided.

The adjustment amount in this example is adjustment in the direction in which the sign + increases the flow rate, and adjustment in the direction in which − decreases the flow rate, and the numerical value corresponds to the adjustment amount in those directions.
Based on the adjustment amount, the flow rate adjustment valve 4 (4a, 4b,..., 4n) was adjusted while viewing the indication value of the flow meter 6, and the indication value of the flow meter 6 changed by the adjustment amount. At that point, the adjustment on that individual line is complete.
For example, in the line 1a, the flow rate adjustment valve is adjusted until the indicated value of the flow meter 6 becomes +3.8. The same applies to the other lines.
[0010]
FIG. 2 shows changes in the respective flow rates when the flow rate adjustment valves 4 are sequentially adjusted from the individual lines 1a to 1b with the above adjustment amounts. From this, by applying the present invention, It can be seen that the variation in the flow rate of the individual lines can be reduced.
For example, in the adjustment shown in FIG. 2, the variation in the flow rate can be reduced to about 5.8%.
[0011]
【The invention's effect】
As described above, according to the present invention, in the fluid transfer line configured to join the fluid flowing in the plurality of individual lines and flow to the joining line, the flow meter is provided only in the joining line, not in each individual line. The number of installed meters can be greatly reduced, and the equipment cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a system diagram conceptually showing the structure of a fluid transfer line to which a method of the present invention is applied.
FIG. 2 shows the result of adjusting the flow rate according to the present invention.
FIG. 3 is a system diagram conceptually showing the structure of a fluid transfer line to which a conventional method is applied.
[Explanation of symbols]
1 (1a, 1b, ..., 1n) Individual line 2 Merge line 3 (3a, 3b, ..., 3n) Flow meter 4 (4a, 4b, ..., 4n) Flow rate adjusting valve 5 (5a, 5b, ..., 5n) On-off valve (Line source valve)
6 Flow meter

Claims (2)

In the fluid transfer line configured to join the fluid flowing in multiple individual lines and flow to the merge line, each individual line is provided with an open / close valve and a flow rate adjustment valve, and a flow meter is installed in the merge line to open / close each individual line The valves are closed one by one in order, and the flow rate variation of each individual line is determined by the decrease in the indicated value of the flow meter that occurs at that time, and the flow rate adjustment valve of each individual line is set to eliminate the flow rate variation. Method for adjusting flow rate of fluid flowing through a plurality of lines, characterized by adjusting The flow rate reduction valve for each individual line is obtained with a deviation between the average value and an adjustment amount of the flow regulating valve is set according to the deviation. Flow rate adjustment method

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