New method for controlling secondary side temperature of thermal substation

Abstract

The invention relates to a new method for controlling secondary side temperature of a thermal substation. The control method used currently is very easy to cause increase and decrease of the pressure of a primary network trunk line in the practical operation and further directly cause instable pressure at a heat source (thermal power plants or boiler houses). When controlling the secondary side temperature, the method not only needs to adjust a primary network water supply / back-water valve of a heat exchanging unit to control secondary side temperature, but also needs to adjust a valve of a primary network communication pipe of the heat exchanging unit, which is used as one part for controlling the secondary side temperature operation. In the practical operation of controlling the secondary side temperature, the pressure change of a heat source 100 and main trunk lines 101 and 102 in a central heat-supplying network is basically zero or greatly smaller than that of the method used currently.

Description

technical field [0001] The invention relates to a new method for controlling the temperature of the secondary side of a thermal station. The temperature of the secondary side in the invention may refer to the temperature of the water supply at the secondary side, or the temperature of the return water at the secondary side, or the water supply at the secondary side The average temperature of the temperature and return water temperature or other temperatures related to the secondary side supply water temperature or return water temperature calculated by a certain formula. Background technique [0002] When controlling the temperature of the secondary side, each thermal station in the existing central heating network mostly increases or decreases the point 4 by adjusting the opening of the primary side water supply valve 11 (or the primary side return water valve 10) of the heat exchange unit. flow, and the opening of valve 1 on the primary side connecting pipe remains unchang...

AI Technical Summary

Problems solved by technology

However, reducing the opening of the branch line valves of each primary network will inevitably lead to a rapid increase in the pressure of 101 and 102 in the central heating network

Therefore, the method currently used is very likely to cause the pressure of the main line of the primary network to increase or decrease in actual operation, which will directly cause the pressure at the heat source (thermal power plant or boiler room) to be unstable, even if the primary network circulation pump at the heat source is frequency conversion Speed-regulating pumps are also difficult to avoid damage to equipment due to sudden pressure changes. Therefore, the current method has certain disadvantages and limitations in actual operation.

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