Method for reducing return water temperature of heat supply pipeline

Abstract

The invention discloses a method for reducing return water temperature of a heat supply pipeline, which belongs to the technical field of energy. A waterway system of the heat supply pipeline is divided into a primary network hot water pipeline and a secondary network hot water pipeline, and the return water temperature of a primary network of the heat supply pipeline of a centralized heat supplysystem is reduced with the help of an absorption heat pump / refrigerator and a water-water heat exchanger or the single absorption heat pump / refrigerator, thereby increasing the temperature differencebetween supply water and return water of the primary network, wherein, when the single absorption heat pump / refrigerator is used, the primary network hot water pipeline and the secondary network hot water pipeline are connected by adopting the direct connection way, when the absorption heat pump / refrigerator and the water-water heat exchanger are used, the primary network hot water pipeline and the second network hot water pipeline are connected by adopting the indirect connection way. The method can greatly reduce the return water temperature of the primary network pipeline, increase the temperature resistance between the supply water and the return water of the primary network, further reduce the initial development of the heat supply pipeline and the transmission and distribution energy consumption of the primary network to a greater extent, reduce the operation cost of centralized heat supply and enlarge the heat supply radius of a heat source for heat supply.

Description

technical field [0001] The invention belongs to the field of energy technology, in particular to a method for reducing the return water temperature of a heat supply pipeline. Background technique [0002] With the continuous expansion of city scale, high-temperature hot water generated by centralized heat sources often needs to be transported over a long distance to reach heat users, and the energy consumption of pipeline network transmission and distribution is relatively large. With the development of urban economy and population growth, the heating load of the city increases sharply, and the existing heating pipe network can hardly meet the heat load demand of heat users according to the conventional operation mode. Under the same hot water flow rate and heating temperature, reducing the return water temperature and increasing the temperature difference between hot water supply and return water can increase the heating load and reduce the hot water consumption of the pipe...

AI Technical Summary

Problems solved by technology

At present, the temperature of the hot water supply and return water in the primary network of the central heating system is generally about 130°C / 70°C. Due to the limitation of heat requirements of the heating users, the return water temperature of the primary network is higher than the return water temperature of the secondary network. Therefore, the temperature difference between primary network supply and return water is limited

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