Extraction steam heating structure and power plant steam unit heating system

Abstract

The invention relates to a field of power plant heat supply technology and discloses a steam extraction heat supply structure and a heat supply system of a power plant steam unit. The steam extraction heat supply structure includes an intermediate pressure cylinder and a low pressure cylinder of the steam unit, a steam pipeline communicating the intermediate pressure cylinder with the low pressure cylinder and a steam extracting pipeline. One end of the steam extracting pipeline communicates with the steam pipeline while the other end is used for being connected to a heat supply network. A segment, located between the steam extracting pipeline and the low pressure cylinder, of the steam pipeline, is provided with an adjusting valve. The opening degree of the adjusting valve can be adjusted between a full open position and a minimum opening degree position so as to adjust the steam volume flow to the low pressure voltage. Therefore, a part of steam exhausted from the intermediate pressure cylinder can be conveyed to the heat supply network through the steam extracting pipeline, so that the heat supply area can be increased distinctively at the same time of saving power generating fire coal. The smoke exhaust is reduced, the unit efficiency is improved and the refit cost is low.

Description

technical field [0001] The invention relates to the technical field of power plant heat supply, in particular to a steam extraction heat supply structure and a power plant steam unit heat supply system with the steam extraction heat supply structure. Background technique [0002] At present, most domestic power plants have realized cogeneration in actual production, that is, cogeneration not only generates electric energy, but also uses steam generated by steam turbines for power generation to provide heat, which is of great significance for saving energy and improving the environment. . For example, in a thermal power plant, the steam turbine is used as the prime mover for power generation, converting the steam heat energy from the boiler into mechanical energy, and then through the generator into electrical energy for transportation and utilization. [0003] With the development of power plant technology, multi-cylinder steam turbines (such as two-cylinder steam turbines,...

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Problems solved by technology

[0005] However, the above-mentioned traditional steam extraction heat supply steam turbine unit has many disadvantages: on the one hand, during the opening process and the opening state of the safety valve, the steam is subjected to a sudden increase in pressure difference, which produces relatively large noise, and the steam working medium is Directly exhausted to the atmosphere, resulting in waste of working fluid and energy; on the other hand, in order to avoid the exhausted steam affecting the operation of other equipment, the exhaust pipe with safety valve needs to be led to an appropriate position (such as extending upward to a greater height), Construction is difficult and expensive

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