System and method for heating heat supply network circulating water by using series heat supply network heaters

Abstract

The invention discloses a system and a method for heating heat supply network circulating water by using series heat supply network heaters. The system comprises a steam turbine steam extraction system and a series heat supply network heater system. The steam turbine steam extraction system comprises a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder which are coaxially connected, as well as a low-pressure steam extraction pipeline, an intermediate-pressure steam extraction pipeline and a high-pressure steam extraction pipeline. The series heat supply network heater system comprises three heat supply network heaters, three heat supply network heater drainage pipelines, a heat supply network circulating water inlet pipeline, a heat supply network circulating water return pipeline, a heat supply network circulating water pump, a heat supply network circulating water pump executing mechanism and a heat consumer. On the one hand, the water supply temperature of the heat supply network can be changed within a larger range, the adaptability of unit heat supply is improved, on the other hand, by inputting the first heat supply network heater, the second heat supply network heater and the third heat supply network heater step by step, further close connection of heat loads and electric loads can be achieved, and the economical efficiency of a steam turbine unit is improved.

Description

technical field [0001] The invention belongs to the technical field of heat supply and utilization of steam turbines, and in particular relates to a system and method for heating circulating water of a heat network by using a series heat network heater. Background technique [0002] At present, there are also some systems and methods for series heating network heaters. For example, in the Chinese patent with the authorization date of May 28, 2019 and the authorization announcement number CN109812866, a two-stage series exhaust steam waste heat recovery heating system is disclosed. , the system uses the first-stage steam ejector and the second-stage steam ejector to heat the circulating water of the heating network in stages, which can not only improve the energy-saving effect of exhaust steam waste heat recovery, but also greatly improve the safety of heating supply. But this patent has limited the application of this patent in the heat network heater of large-scale thermal ...

AI Technical Summary

Problems solved by technology

The system effectively absorbs low-grade heat sources in the environment, but adds a heat pump, which increases the complexity of the system and the cost of operation and maintenance

[0003] To sum up, for the series heating network heaters of in-service units, there is currently no universal, convenient and reliable utilization scheme for series heating network heaters

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