Double-turbine steam thermodynamic system with regenerative steam extraction function

Abstract

The invention provides a double-turbine steam thermodynamic system with a regenerative steam extraction function. The double-turbine steam thermodynamic system comprises a large steam turbine, a small steam turbine and a regenerative cycle unit. The regenerative cycle unit comprises one or a plurality of high-pressure heaters, one or a plurality of medium-pressure heaters, one or a plurality of low-pressure heaters and two deaerators, and a water circulating pipeline is communicated with a boiler via the low-pressure heaters, the low-pressure deaerator, the medium-pressure heaters, the high-pressure deaerator and the high-pressure heaters sequentially. The double-turbine steam thermodynamic system with the regenerative steam extraction function has the advantages that medium-pressure cylinders of the large steam turbine do not need to be provided with steam extraction openings for regenerative steam extraction owing to the double-deaerator structure, medium-pressure cylinder structures of the large steam turbine are greatly simplified, the axial dimension of an integral unit is reduced, and the through-flow capacity of the large steam turbine is improved; and sufficient flow and sufficient power for the small steam turbine can be guaranteed, a complicated logic balance system for the power of the small steam turbine is omitted, and accordingly the integral system is simple and reliable.

Description

Technical field [0001] The invention relates to a dual-engine regenerative steam extraction steam thermal system. Background technique [0002] Energy saving and emission reduction has become the main goal of power industry technology and product development. The key technologies involved include the following aspects: the application of higher steam parameters, the aerodynamic and strength optimization technology of high temperature and high pressure structures, the performance of thermal cycles and auxiliary systems Optimization, combined heat and power, etc. Among them, improving steam parameters is the most effective technical measure to achieve energy saving, emission reduction, and efficiency improvement. At present, the highest inlet steam parameters of clean coal-fired ultra-supercritical steam turbine units have reached 28MPa, 600℃ / 620℃. Compared with the previous supercritical parameters of 24.2MPa and 566°C / 566°C, the heat consumption benefit of this ultra-supercriti...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a dual-machine regenerative extraction steam thermal system, which is used to solve the problem that all the extraction pipes in the prior art are directly connected to the main steam channel of the large steam turbine. Therefore, it has adverse effects on high-parameter steam turbines, such as high temperature and high pressure, and large energy level loss.

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