a condenser

Abstract

The invention discloses a steam condenser, which comprises an afterheat heat exchanging device and a main condensing device, wherein discharged steam of a steam turbine sequentially passes through the afterheat heat exchange device and the main condensing device, discharged steam of the steam turbine exchanges heat with a secondary circulation cooling water when passing through the afterheat heat exchanging device, and exchanges heat with a first circulation cooling water when passing through the main condensing device, wherein the temperature of the second circulation cooling water after the heat exchange is higher than the temperature of the first circulation cooling water before the heat exchange. The steam condenser is divided into two heat exchange regions, the afterheat of high-temperature cooling water can be extracted under the condition of maintaining the unchanged operating back pressure of a machine unit, the application range of the recovered afterheat is enlarged, and in addition, the afterheat utilization stability is ensured.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery, in particular to a condenser. Background technique [0002] In the thermodynamic cycle of the power generation condensing unit, the condenser acts as a cold source. Its main task is to condense the steam discharged from the steam turbine into the condenser, so as to establish a vacuum as high as possible at the steam exhaust port of the steam turbine, and provide condensed water with low subcooling and oxygen content for the boiler. Although the design of modern condensers has accumulated a considerable amount of experience and test data, and has formed an international technical specification represented by HEI (Heat Exchanger Association of America), this design method still has great limitations. . Because when designing according to the HEI standard, an average heat transfer coefficient is first estimated, and then the cooling surface area required to form the design vacuum can ...

AI Technical Summary

Problems solved by technology

Since the exhaust steam from the final stage of the steam turbine has to go through a large turn of more than 90° to reach the inlet of the condenser, the velocity distribution has already shown an uneven distribution. In addition to the aforementioned complex structure of the throat, the flow field at the outlet of the throat of the condenser presents a A complex flow state with a large number of swirls and extremely uneven velocity distribution

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