Dual-machine regenerative steam extraction steam thermodynamic system

Abstract

The invention provides a dual-machine regenerative steam extraction steam thermodynamic system. In the system, the intermediate stage of a high pressure cylinder of a main steam turbine is provided with a high pressure steam extraction opening, the high pressure steam extraction opening is respectively connected with a steam inlet of a small steam turbine and one high pressure heater with the highest steam inlet parameter in a plurality of high pressure heaters through high pressure steam extraction pipelines, the intermediate stage of the small steam turbine is provided with a plurality of regenerative steam extraction openings which are connected with the rest high pressure heaters except the high pressure heater with the highest steam inlet parameter through regenerative steam extraction pipelines, and a steam exhaust port of the small steam turbine is connected with a deaerator through a steam exhaust pipeline of the small steam turbine. According to the system disclosed by the invention, a high-temperature preposed steam cooler can be omitted, and the feed-water temperature of a boiler is reduced, which helps to improve the efficiency of the boiler and reduce the heat consumption of a machine set; and flow loss can be effectively reduced, the circulation efficiency is improved, and the cost of equipment is reduced.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to a thermodynamic system using a small steam turbine for extracting steam and recovering heat. Background technique [0002] Electricity is the most basic, cleanest, and most convenient energy source for human society. Due to the current situation of the earth's primary energy sources, the pattern of coal-fired power generation in the electric power industry will not change for a long period of time. Coal-fired power generation produces clean energy and electricity, but also produces a lot of pollution and CO 2 Emissions, CO calculated based on my country's coal-fired power generation in 2011 2 Emissions have exceeded 3 billion tons. In order to protect the environment and save resources, how to improve the efficiency of steam turbines has become an issue that the industry pays more and more attention to. [0003] In order to improve the efficiency of steam turbines, currently stea...

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Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a dual-machine regenerative steam extraction steam thermal system, which is used to solve the problems of unstable operation of equipment and high production cost of equipment in the prior art.

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