Heat supplying method of cooling water residual heat recycling energy-saving system of thermal power plant

Abstract

The invention provides a heat supplying method of a cooling water residual heat recycling energy-saving system of a thermal power plant. In the method, steam produced by action of the thermal power plant flows into a condenser through a steam pipeline, and is subjected to heat release and liquefaction; cooling water absorbs heat released when the steam is liquefied in the condenser, and is delivered to a heat exchange station E through a water outlet pipeline A to serve as a low-temperature heat source; water in a heat supply network is heated by utilizing the heat of the low-temperature heat source under the action of a heat pump, and flows into a cooling tower through a return pipeline B; and the water in the heat supply network is heated in the heat exchange station E and delivered to a client end so as to be utilized as a heat supply source, and returns to the heat exchange station E after supplying heat. The temperature of cooling water delivered to the heat exchange station E in urban areas is 35-45 DEG C, so that low-temperature delivery is realized, and the heat loss is small.

Description

technical field [0001] The invention relates to the technical field of waste heat reuse of cooling water in a thermal power plant, in particular to a heat supply method for an energy-saving system for recovering waste heat from cooling water in a thermal power plant. Background technique [0002] At present, thermal power plants in the society generate steam through thermal heating, and the steam drives the steam turbine to rotate and cut the magnetic field lines to generate electricity. However, the efficiency of thermal power generation is only about 40%, and about 60% of the heat energy of the steam passing through the steam turbine is not utilized, and it is directly passed into the condenser to liquefy and lose the heat energy to the environment. In order to save energy, protect the environment, and utilize the above-mentioned wasted energy, there have been many schemes, such as the invention patent "A method for recovering waste heat from thermal power plants and casca...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: first, the heat pump is driven by steam, and steam needs to be taken from the end of the steam turbine, which affects the efficiency of power generation, and the risk is high; The temperature difference between high-temperature water and ground temperature is large, the heat loss in the transportation process is large, and thermal expansion and contraction have high requirements on pipelines and related equipment, which requires large investment and low utilization rate

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