Heat supply system return water temperature regulation and control system and method

Abstract

The invention relates to a heat supply system return water temperature regulation and control system and method. In the regulation and control system, a heat source is connected with an inlet of a water supply pipe, a heat source water supply temperature sensor and a water supply pressure sensor are sequentially installed on the water supply pipe, an outlet of the water supply pipe is connected with a heat user, the heat user is connected with an inlet of a water return pipe, a heat meter, a return water pressure sensor, a return water temperature sensor and a circulating water pump are sequentially installed on the return water pipe, the tail end of the return water pipe is connected with the heat source, all sensors are connected with the input end of a controller, and the output end ofthe controller is connected with a heat source control end. According to the heat supply system return water temperature regulation and control system and method, the return water temperature three-window regulation and control method is adopted and is a method for coping with nonlinear controlled objects, the pipe network hydraulic stability is better by setting incremental experience values, window upper and lower limit values and control periods and weakening influences of large lag, large inertia and nonlinear characteristics of various heat supply devices, the regulation and control system is simple in structure, and the accuracy of the return water temperature can be controlled.

Description

technical field [0001] The invention belongs to the field of heating systems, and in particular relates to a system and method for regulating and controlling the return water temperature of the heating system. Background technique [0002] At present, in the heating system, the temperature of the supply water or the average temperature of the supply and return water is used to regulate the heat supply. Due to various reasons, the regulation of the heat supply is not very successful. The reason is that the heat load calculated according to the outdoor temperature is not very accurate; In the practice of heating operation, people mostly use empirical methods, that is, according to the external temperature to ensure that the return water temperature is not lower than a certain value, the room temperature can be guaranteed to meet the standard. Therefore, controlling the return water temperature is equivalent to controlling the room temperature. It can ensure that the room tempe...

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Problems solved by technology

[0003] However, in the practice of heating operation, the commonly used PID algorithm is used for common linear, small lag, and small inertia control systems. For example, the temperature control of the supply water in the heating system is still possible, but it is full of difficulties for the control of the return water temperature. Due to the large lag, large inertia, nonlinearity and too many uncertain factors of the heating network, it is very difficult to control the return water temperature; the common return water temperature lags behind the change of the heat source water supply temperature by at least 20 to 30 minutes , often exceeding 1 hour, commonly used devices and algorithms cannot meet the control requirements for the return water temperature of the heating system

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