Boiler feed water system with turbine exhaust steam recovery

Abstract

The invention relates to a boiler feed water system with turbine exhaust steam recovery, in particular to a super energy saving boiler feed water system. 1/10-1/4 of the total exhaust flow of steam turbine in a thermal power plant is condensed, and then jetted by the an ultra-high pressure feed water pump, while the remaining 3/4-9/10 of the exhaust flow of steam are not condensed, and then steamis discharged to the swirl tube. After internal steam and water are fully mixed, normal boiler feed water pressure is reduced to realize the mixed feed water of the steam and water. The system is arranged with a jet device behind a water pump, a steam cavity of a water jet leading belt and a steam water forming cavity, and can used for elimination of quasi total effect regenerative power generation of thermal power plant.

Description

technical field [0001] The invention relates to a boiler feed water system for quasi-full-efficiency reheating of exhaust steam from a steam turbine, in particular, 1 / 10 to 1 / 4 of the total fraction of exhaust steam from a steam turbine is condensed and the remaining 9 / 10 to 3 / 4 of the non-condensed exhaust steam flows into the swirl cylinder after the steam and water are fully mixed and then reduced to the normal boiler feed water pressure to realize the steam and water mixing. Thermal power plants and other super energy-saving boiler feed water systems that eliminate quasi-full-efficiency regenerative power generation (or steam-water mixed flow cold and heat shock). Background technique [0002] At present, the well-known thermal power is limited by the destructive power of the "cavitation" impact of the high-potential energy feed water of the steam boiler that cannot be borne by the conventional boiler feed water pump. However, it has to develop towards ultra-supercritic...

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Problems solved by technology

[0002] At present, the well-known thermal power is limited by the destructive power of the "cavitation" impact of the high-potential energy feed water of the steam boiler that cannot be borne by the conventional boiler feed water pump. However, it has to develop towards ultra-supercritical and extreme-efficiency cooling towers. The entire thermal power plant has never been able to directly pump even part of the exhaust steam from the steam turbine into the boiler. In addition, the multi-stage heat recovery technology of steam turbine exhaust is also very limited in energy saving. As a result, all thermal power and nuclear power related to steam turbine power generation or power conversion in the world are all stagnant at the level of "35-50%" (the root cause is concentrated in "excessive loss of refrigerant", the problem is in the feed water pump The higher the flow pressure head, the steam-water mixture will inevitably produce thousands or even thousands of liquid vapor cavity water impacts per second in the pump body, and this impact force will inevitably produce destructive power to any material) The efficiency of all thermal power plants in the world has been kept below 45%. Even the combination of gas turbines combined with ultra-supercritical boilers for combined cycle power generation is rare with a super-efficiency of about 50% (Western scholars such as the United States and Japan) It is predicted that "62% plant efficiency" will be ten years later, and it will be about 65-70% in twenty years)

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