Plate type heat exchange nonlinear temperature control system

Abstract

The invention discloses a plate-type heat exchange nonlinear temperature control system, which is characterized in that an open water inlet pipeline and a circulating water outlet pipeline of a cold water tank are respectively provided with a flow detection piece, a temperature detection piece and a flow valve, and an open water outlet pipeline and a circulating water inlet pipeline of the cold water tank are respectively provided with a flow valve; a circulating water outlet pipeline of the hot water tank is provided with a heater, and a circulating water inlet pipeline is provided with a temperature detection piece; the control system controls the temperature value of cold water before entering the plate heat exchanger and the temperature value of hot water after flowing out of the plate heat exchanger to be constant by controlling the flow of the open water inlet and outlet pipeline of the cold water tank and the flow of the circulating water inlet and outlet pipeline of the cold water tank. And the control system takes the multi-input coupling nonlinear mathematical model of the heat exchange system as a multi-input affine nonlinear model, and a sliding mode variable structure controller is obtained through solving. The system is stable and good in control, small in overshoot, fast in response and high in interference resistance.

Description

technical field [0001] The invention belongs to the field of thermal automatic control, in particular to a non-linear temperature control system for plate heat exchange. Background technique [0002] Heat exchangers are widely used in power mechanical systems, thermal engineering, energy-saving research on cold-heat-electricity conversion, etc. There are three types of heat exchangers. The research on heat exchangers mostly focuses on the determination of performance parameters and the comparison of heat exchange effects. For the control of the temperature of the heat exchange system, the PID method is generally used. The algorithm has a simple structure and does not need to establish an object Accurate mathematical model, but it is difficult to select appropriate parameters such as proportional band, integration time and derivative time, and it is not suitable for highly coupled nonlinear systems. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is ...

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Problems solved by technology

[0002] Heat exchangers are widely used in power mechanical systems, thermal engineering, and energy-saving research on cooling, heating, and electricity conversion. Commonly used heat exchangers include sleeve-and-tube heat exchangers, plate heat exchangers, and tube-and-tube heat exchangers. There are three types of heat exchangers. The research on heat exchangers mostly focuses on the determination of performance parameters and the comparison of heat exchange effects. For the temperature control of heat exchange systems, the PID method is generally used. This algorithm has a simple structure and does not need to establish objects. Precise mathematical model, but it is difficult to choose the appropriate parameters such as proportional band, integral time and differential time, and it is not suitable for highly coupled nonlinear systems

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