Externally arranged steam cooler system in heat regenerative system of power plant and heat regenerative system

Abstract

The invention provides an externally arranged steam cooler system in a heat regenerative system of a power plant and the heat regenerative system. The heat regenerative system comprises multiple stages of water feeding heaters, a deaerating heater, a water feeding pipeline and a water drainage pipeline. The externally arranged steam cooler system comprises an externally arranged steam cooler and a steam pipeline, wherein the externally arranged steam cooler is arranged on the water drainage pipeline of the water feeding heaters, a steam inlet of the externally arranged steam cooler is communicated with a superheat-degree steam suction port of a steam turbine through a pipeline, and the externally arranged steam cooler is used for heating water drained from the water feeding heaters. Compared with a system in which high-pressure feeding water is heated directly through an existing externally arranged steam cooler system by utilization of the superheat degree of superheat-degree steam, the externally arranged steam cooler system in the heat regenerative system of the power plant can improve efficiency of a thermal system, can remarkably lower the fabricating cost of equipment and the pipelines, can improve the rate of return on investment and can expand the application scope of the energy-saving and consumption-lowering technology at the same time.

Description

technical field [0001] The invention relates to thermal power generation equipment, in particular to an external steam cooler system in the heat recovery system of thermal power generation equipment. Background technique [0002] In the heat recovery system of a thermal power plant, an external steam cooler is usually equipped for the extraction steam with a high degree of superheat to improve the efficiency of the thermal system. [0003] For turbogenerators with a large amount of superheated steam, such as figure 1 Outboard steam cooler system shown for full feedwater capacity. That is, the external cooler 4 is arranged after the final feedwater heater 3, and all the feed water of the final feedwater heater 3 enters the external steam cooler 4, and the high superheat extracted steam after being cooled by the external steam cooler 4 enters A certain level of feed water heater or deaerator 2 or condensate water heater 1 before the final feed water heater 3 . [0004] For ...

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Problems solved by technology

High operating and design pressures lead to difficult equipment manufacturing, high cost, and high operational safety requirements. At the same time, the cost of piping systems (including pipes, fittings, valves, etc.) is high, which affects the return on investment

[0007] For many turbogenerators that have been put into operation but are not equipped with external steam coolers, although it is known that the configuration of external steam coolers can improve the efficiency of the thermal system, save energy and reduce consumption, due to the above reasons, this prior art has not been widely used. to promote

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