CSTR temperature fault-tolerant control system based on double heat exchangers and method thereof

Abstract

The invention discloses a CSTR temperature fault-tolerant control system based on double heat exchangers. The CSTR temperature fault-tolerant control system comprises a temperature controller and a coil pipe flow controller. The input end of the temperature controller is connected with a temperature detection device. A coil pipe flow regulating valve is connected with the output end of the temperature controller. A clamp sleeve flow regulating valve is connected with the output end of the coil pipe flow controller. The CSTR temperature fault-tolerant control system also comprises a fault-tolerant controller, a fault alerter and a fault information displayer. The input end of the fault-tolerant controller is connected with a coil pipe flow detection device and a clamp sleeve flow detection device. The temperature controller and the coil pipe flow controller are connected with the fault-tolerant controller. The temperature detection device is connected with the input end of the fault-tolerant controller. The invention also discloses a CSTR temperature fault-tolerant control method based on the double heat exchangers. The CSTR temperature fault-tolerant control system is high in control precision, high in heat exchange efficiency and low in heat-carrying medium consumption so that working safety and reliability of a CSTR are enhanced and economic benefit produced by reaction of the CSTR is enhanced.

Description

Technical field [0001] The invention belongs to the technical field of temperature control and production safety of a continuous stirring reactor, and specifically relates to a CSTR temperature fault tolerance control system and method based on a double heat exchanger. Background technique [0002] Continuous Stirred-Tank Reactor (CSTR) is a process equipment that realizes various physical changes and chemical reactions in chemical production, and it 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 reactor. In addition, CSTR is also widely used in industries such as pharmaceuticals, paints, dyes, and pesticides. The CSTR reaction temperature is the most important control parameter in the polymerization process, and its control quality is closely related to production safety, production efficiency and economi...

AI Technical Summary

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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