CSTR (continuous stirred-tank reactor) temperature control system and method based on coil heat exchanger and jacketed heat exchanger

Abstract

The invention discloses a CSTR (continuous stirred-tank reactor) temperature control system and method based on a coil heat exchanger and a jacketed heat exchanger. The control system comprises a temperature controller. An input end of the temperature controller is connected with a temperature measuring device, an output end of the temperature controller is connected with a coil flow regulating valve and a coil flow controller, and an output end of the coil flow controller is connected with a jacket flow regulating valve. The control method includes detecting a CSTR temperature signal in real time and transmitting the same; collecting the CSTR temperature signal in real time and analyzing and processing the same; controlling heat-carrying agent flow of the coil heat exchanger by the temperature controller and the coil flow regulating valve; and controlling the heat-carrying agent flow of the jacketed heat exchanger by the coil flow controller and the jacket flow regulating valve to correspondingly regulate heat-carrying agent flow of the coil heat exchanger. The CSTR temperature control system and the control method are novel and reasonable in design, quick in control speed, high in control precision, high in heat exchanging efficiency, low in heat-carrying agent consumption, favorable for saving energy and reducing consumption, and convenient to implement.

Description

technical field [0001] The invention relates to the technical field of temperature control of a continuous stirring reactor, in particular to a CSTR temperature control system and method based on a coiled tube and a jacket double heat exchanger. Background technique [0002] Continuous Stirred-Tank Reactor (CSTR for short) is a process equipment for realizing various physical changes and chemical reactions in chemical production, and occupies an important position in the reaction device. In the production of the three major synthetic materials of plastics, chemical fibers and synthetic rubber, the number of CSTRs accounts for more than 90% of the total reactors. In addition, CSTR is also widely used in industries such as pharmaceuticals, paints, dyes, and pesticides. CSTR reaction temperature is the most important parameter in the production process of continuous stirred reactor, and the quality of reaction temperature control is closely related to production efficiency and...

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Problems solved by technology

[0004] ①The jacket heat exchange system is characterized by high heat exchange efficiency (large jacket volume, long residence time of heat transfer medium in the jacket, sufficient heat exchange), but slow response speed (large time constant)

The use of jacketed heat exchangers for daily production reaction temperature control has the advantage of low energy consumption, and the disadvantages of poor dynamic performance, low control accuracy, large dynamic deviation, and accidents that are prone to temperature out of control and have to be forced to stop.

[0005] ②Snake tube heat exchange system is characterized by fast response speed (small coil volume, small time constant), but low heat transfer efficiency (small coil volume, short residence time of heat-carrying medium in coil tube, insufficient heat transfer)

The coil heat exchanger is used for daily production reaction temperature control. The advantage is that the reactor temperature dynamic performance is good and the control accuracy is high, but the heat transfer medium is small in heat transfer, the energy consumption of the heat transfer medium is high, and the economy is poor.

[0006] Obviously, these two control schemes have not fully utilized the potential of the coil heat exchanger and the jacket heat exchanger in temperature control, and cannot take into account both high control quality and energy saving and consumption reduction.

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