A cstr temperature fault-tolerant control method based on double heat exchangers

Abstract

The invention discloses a CSTR temperature fault-tolerant control method based on double heat exchangers. The system adopted includes a temperature controller and a coil flow controller. The input end of the temperature controller is connected with a temperature detection device and a coil flow regulating valve. It is connected to the output end of the temperature controller, and the jacket flow regulating valve is connected to the output end of the coil flow controller; the CSTR temperature fault-tolerant control system also includes a fault-tolerant controller, a fault alarm and a fault information display, and an input port of the fault-tolerant controller The coil flow detection device and the jacket flow detection device are connected, the temperature controller and the coil flow controller are connected to the fault-tolerant controller, and the temperature detection device is connected to the input end of the fault-tolerant controller; the method includes six steps. The invention has high control precision, high heat exchange efficiency, and small heat-carrying medium consumption, thereby improving the safety and reliability of CSTR work and the economic benefits of CSTR reaction production.

Description

technical field [0001] The invention belongs to the technical field of temperature control and production safety of a continuous stirring reactor, and in particular relates to a CSTR temperature fault-tolerant control method based on double heat exchangers. 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 control parameter in the polymerization reaction process, and its control quality is closely related to production safety, production efficiency and e...

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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] ②The coil heat exchange system is characterized by fast response speed (small coil volume, small time constant), but low heat exchange efficiency (small coil volume, short residence time of the heat transfer medium in the coil, insufficient heat exchange)

However, in the dual control system, the advantages of operational redundancy formed when the coil and the jacketed double heat exchangers work at the same time, obviously, when one of the coil heat exchanger or the jacket heat exchanger appears When a flow failure occurs, the operation function of the control system is not completely lost, and it still has the potential to realize CSTR temperature control, continuous operation and production. The existing technology still lacks CSTR based on dual control coils and jacketed double heat exchangers Temperature fault-tolerant control system and method

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