Optimal control method for energy saving of industrial circulating water based on double-layer structure predictive control

Abstract

The invention relates to an energy-saving optimization control method for industrial circulating water based on double-layer structure predictive control, which comprises the steps of building a dynamic model and steady-state model of a circulating water system; setting the priority of a controlled variable, the priority of an operating variable, the benefit direction of the operating variable andthe correlation direction between the operating variable and the controlled variable; establishing an objective function, and constructing constraint conditions according to technological conditionsand the steady-state model; if there is a feasible region, acquiring an optimal operating point; otherwise, properly loosening the constraint conditions for the controlled variable to obtain the optimal operating point; enabling the obtained optimal operating point to serve as a set value, building a model prediction controller, and implementing a control action. The energy-saving optimization control method realizes that each production unit of the circulating water system operates with the return water temperature being always below the highest allowable temperature. Meanwhile, the pipe network output flow of the circulating water system is enabled to be reduced, and the pressure is reduced. Therefore, the energy-saving optimization control method realizes the effects that the operationcost is reduced, and the system is energy-saving.

Description

technical field [0001] The invention relates to the field of optimization control, in particular to an energy-saving optimization control method for industrial circulating water based on double-layer structure predictive control. Background technique [0002] The industrial circulating water system is configured for the cooling of production equipment, and is widely used in the production of petrochemical, thermoelectric, steel, metallurgy, pharmaceutical, chemical fiber and other important national economic fields. According to statistics, the power consumption of pumps accounts for about 21% of the national power generation, and the energy consumption of pumps in industrial circulating water systems accounts for more than 70%. Therefore, improving the energy utilization efficiency of industrial circulating water systems is of great significance to saving energy. [0003] The main equipment involved in the industrial circulating water system involved in the present inventio...

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Problems solved by technology

The throttling adjustment method of the valve causes a large amount of energy to be wasted on the valve resistance of the pipe network, and the operation mode of the most unfavorable working point causes the flow rate of some branches to be too large, which also causes energy waste

[0005] In terms of control methods, due to the characteristics of multi-coupling, nonlinearity, and large lag in the process of industrial circulating water systems, the traditional classic control method is only based on a single loop, and cannot achieve accurate temperature control of the circulating water system from a system perspective. Can not meet the energy saving requirements of industrial circulating water

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