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The tower of acetic acid rectify that pays close attention to wants here fall bear controls a construction, basically be to have 3 kinds of different forms, and have different actor drawback severally. Fall in different operating mode so, tower of acetic acid rectify should use corresponding control structure, accomplish accurate control.
The structure of 3 kinds of control related to tower of acetic acid rectify is position control of double lukewarm control, a powerful person and circular control respectively. When tower of acetic acid rectify processing is operated normally when the circumstance falls, structure of double lukewarm control can be used again boil implement heat steam discharge will control tray temperature.
When steam discharge heats to fall to be worth to its floor level in tower of acetic acid rectify, the structure is met again switch is become will control tray temperature through circumfluence discharge. And test proof, heat it is quite fast that the trends of steam discharge and tray temperature is answered, but the trends between capacity of returns and tray temperature is answered basically depend on position of entrance of cat head circumfluence and accuse the tray between lukewarm tray to count, along the tower Gao Yue is down, trends is answered slower.
If tower of acetic acid rectify is used position control of a powerful person, that control action is when be close to in vapour discharge or be worth under floor level, change circumfluence enters makings comparing. In normal unit process of cargo bandling, the set point signal of position control of a powerful person wants than real vapour flow low, its output signal is so inferior, won’t by exalted selector pitch on.
This shows, structure of this kind of control is through heating steam controls temperature from beginning to end, and have control lukewarm function goodly. Also put in proper corrupt practice however, cannot make sure vapour quantity is sheer namely won’t under its lesser value, bring about control thereby not quite strict.
In be controlled circularly, when productivity is inferior, the temperature of tower of acetic acid rectify is by enter makings of flow control, photograph of this kind of means compares double lukewarm control for more strict. The place on put together is narrated, tower of acetic acid rectify uses structure of double lukewarm control, the control function of temperature not beautiful, the purity error of the product is bigger also; And the problem of structure of position control of a powerful person depends on cannot assuring again boil implement thermic load not under its the limitative condition of the least value; Relative to character, the control that no matter be temperature,controls a construction circularly or the control that child constitutes are relatively ideal.