Abstract:

To reduce leakage faults and improve the efficiency of fault detection for hot-water district heating network, a hydraulic-condition calculation model of node leakage was established based on the network graph theory, which adopted plane topology of a heating network, and could simulate and predict its leakage conditions. Aiming to the fixed pump head of the simulated network, the hydraulic conditions of different leakage nodes and different leakage rate at supply and return water main pipelines were analyzed. Finally, it was found that users’ pressure and flow decreased when the supply pipeline leaked, and the leakage of return pipeline caused opposite results. Whatever, the neighboring was influenced more than others for users before the leakage-node, the while users behind the leakage-node changed in the same and the changing extent exceeded the former.

Key words: district heating, heating network, leakage, fault diagnosis, model, hydraulic conditions