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Method of improving the power cycle efficiency of a steam turbine for supercritical steam conditions

阅读:589发布:2023-12-02

专利汇可以提供Method of improving the power cycle efficiency of a steam turbine for supercritical steam conditions专利检索,专利查询,专利分析的服务。并且A method for improving the efficiency of a power cycle in a steam turbine for initial supercritical steam conditions in which the working fluid is expanded from the initial supercritical steam conditions to a lower pressure which is, however, higher than the critical pressure. The working fluid is divided into two streams, one of which is cooled down in a high temperature regenerative heat exchanger for yielding its heat to feed water already previously heated in regenerative feed heaters. The other stream is expanded in the turbine in a conventional manner, and thereafter the two streams are mixed before entering the high temperature regenerative heat exchanger and boiler. The high temperature regenerative heat exchanger is sub-divided into a number of sections, and the mass flow rate of the heating medium in predetermined sections is changed in a step manner by directing a part of the working fluid from a predetermined point of the power cycle to a predetermined section of the high temperature regenerative heat exchanger.,下面是Method of improving the power cycle efficiency of a steam turbine for supercritical steam conditions专利的具体信息内容。

1. A method of improving the efficiency of the power cycle of a steam turbine for initial supercritical steam conditions comprising the steps of expanding the working fluid from the initial supercritical steam conditions to a lower pressure which is higher than the critical pressure; dividing the working fluid into two streams; cooling one stream in a high temperature regenerative heat exchanger as a heating stream for yielding its heat to a feed water stream passing through the heat exchanger and constituting a heated stream; further expanding the other of said two streams in the turbine; mixing thereafter said one stream after it has passed through the exchanger with said other stream after it has been further expanded to constitute the feed water stream entering the regenerative heat exchanger; the high temperature regenerative heat exchanger being divided into a number of successive sections and varying the ratio of the mass flow rates of the heated stream to the heating stream in successive sections in said heat exchanger in stepped manner to provide substantially constant temperature differences between the two streams in the sections of the heat exchanger by selectively dividing a part of one of the streams from one section of the heat exchanger to another.
2. A method as claimed in claim 1 wherein the ratio of the mass flow rates is varied by stepwise varying the mass flow rate of the heating stream through the successive sections of the heat exchanger.
3. A method as claimed in claim 1 wherein the mass flow rate of the heating stream is stepwise varied by directing a part of the heating stream externally of the heat exchanger from one section to another and by-passing an intermediate section therebetween.
4. A method as claimed in claim 3 comprising cooling the externally directed part of the heating stream before it is returned to thE heat exchanger.
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