Heat efficiency-optimized first steam-water heat exchange station and running method thereof

Abstract

The invention discloses a heat efficiency-optimized first steam-water heat exchange station and a running method thereof.A heat source of a first heat exchanger comprises three parts, wherein the third part is achieved by arranging a drain flash tank at a condensation water outlet of a second heat exchanger and a third exchanger of the first steam-water heat exchange station; high-pressure condensation water generated through high-pressure steam condensation heat exchange and steam generated through secondary evaporation are collected and recycled through the drain flash tank respectively and then enter the first heat exchanger for secondary heat exchange, and energy sources are fully utilized.According to the heat efficiency-optimized first steam-water heat exchange station and the running method thereof, an electric control valve arranged on a high-temperature water return pipeline is controlled through a temperature measuring instrument arranged at the head end of a high-temperature water supplying pipeline, and through the design, the temperature of high-temperature supplied water is adjusted in time according to the changes of the heat exchange amount needed by a user of the first steam-water heat exchange station; a pressure regulating valve is only arranged on a standby steam heating bypass pipeline of the first heat exchanger, no pressure regulating valve is arranged on the other steam heating pipelines of the three heat exchangers, therefore, it is guaranteed that the steam pressure drop at inlets of the heat exchangers is small and the heat transfer temperature difference is large, and it is further guaranteed that only the small heat exchange area of the heat exchangers is needed.

Description

technical field [0001] The invention relates to a heating system, in particular to a thermal efficiency optimized steam-water heat exchange primary station and an operating method thereof. Background technique [0002] The first steam-water heat exchange station is the core component of the residential heating system. The first steam-water heat exchange station is usually set up to match the thermal power plant, and the steam generated by the steam turbine in the thermal power plant is used again. Compared with the heating demand, the steam produced by the power generation cycle of the thermal power plant has a higher pressure and higher temperature. It is directly used in the heat exchanger of the first steam-water heat exchange station, which has limited efficiency and is not conducive to the long-term stable operation of the equipment. The load fluctuates to a certain extent, and the first station of steam-water heat exchange faces the problem of low thermal efficiency i...

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Problems solved by technology

[0005] There are two basic problems in this system: ①. The circulating water pump adopts the electric form, and the operating cost is relatively high, and the initial investment of the motor frequency converter is relatively large; ②. When the heat load of the user is much lower than 30MW, it is not flexible enough in terms of heat load regulation convenient

[0007] There is a basic problem in this system: the purpose of setting up the steam-driven circulating water pump in this system is to reduce the operating cost, and it will run for a long time under normal working conditions. The time is relatively long, and the second heat exchanger continues to operate at full load, the life of the equipment will be affected, and the operation adjustment of the system is not reasonable enough

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