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Pc 2010 4H

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Pc 2010 4H
第4回

プロセス制御レポート

教科書 p.51 [2][3]
[2]
ナフサを加熱炉で加熱分解する図 2.28 のようなプロセスがある。この加熱炉において、以
下のような制御ループ(多重制御構造)を考えた。その P&I ダイアグラムを図 2.28 に描け。
(図中、レシオコントローラは RC で表し、伝送器の計装記号は省略してよい。

(a) 加熱炉出口の分解ナフサの温度は燃料油流量を調整して制御する。
(b) 燃料油の流量制御は、燃料油流量を測定してバルブ開度を調節して行う。
(c) 3系列のパイプラインを流れる流量が等しくなるように制御する。
(d) 加熱炉での総処理量は原料ナフサ流量で調節する。

RC
FC

ナフサ
TC

RC

FC
燃料油

図2.28 ナフサ分解炉

[3]
図 2.29 のように、高圧の蒸気が流れるパイプライン(管路)と低圧の蒸気が流れるパイプ
ラインシステムがある。以下の2つの操作を実現するオーバーライド制御系を、high
selector switch と圧力センサとコントローラを使って実現せよ。
(a) 低圧蒸気の需要が現状の供給量より上回る場合、高圧蒸気のラインから蒸気を低圧蒸
気のラインに流して需要を満たす。このとき、高圧蒸気のラインから低圧蒸気ライン
に流す蒸気の量は低圧蒸気の圧力がある所定の値(設定値)になるように決める。
(b) 高圧蒸気の圧力が規定の上限値を超えそうになる場合は緊急避難に、高圧蒸気の圧力
を上限値以下に戻すように、高圧蒸気ラインから低圧蒸気ラインに蒸気を流す。

HSS :High selector switch
PC

高圧蒸気のライン

低圧蒸気のライン
図2.29 スチーム用役系のオーバライド制御

:Pressure controller

鉄鋼の高炉制御について調査し、A4、1 枚程度にまとめよ。
必ず、出典(参考文献等)を記述すること。(参考:鉄鋼における制御、など)

No.4 Process Control Homework
Text p.51 [2] [3]
[2]
The process in Fig.2.28 heats and cracks the naphtha in heating oven. Consider the following control loops (Multiloop control):
(a) Control the outlet temperature of cracked naphtha in heating oven by coordinating the fuel oil flow rate.
(b) Control the fuel oil flow rate by coordinating the opening of valve and measuring the fuel oil flow rate.

(c) Control so that the flow rate in the three pipelines become equal.
(d) Control the total throughput in heating oven by coordinating the naphtha flow rate of raw material.
Draw the P&I diagram in Fig.2.28. In other words, draw the flow of the signal in the
Fig.2.28 to meet those requirements. (In figure the RC imply ratio controller. You may omit the instrumentation sign of the transmitter.)

RC
FC

Naphtha
TC

RC

FC
Fuel oil

Fig.2.28 Naphtha cracking furnace

[3]
There are the high pressure steam pipeline and the low pressure steam pipeline in
Fig.2.29. Draw override control system in Fig.2.29 in order to achieve the following operations by using a high selector switch, controllers and pressure sensors:
(a) When the demand for the low

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