Condensed water co-utilization system improving cold reheat cold reheat steam supply ability of boiler and method

Abstract

The invention discloses a condensed water co-utilization system improving cold reheat steam supply ability of a boiler and a method. The system comprises a steam pipeline isolating valve, a heat recovery heat exchanger, a flow regulating pore plate, a water inlet isolating valve, a water outlet isolating valve, and a bypass isolating valve; cold reheat steam enters the heat recovery heat exchangerthrough a steam pipeline; after heat exchanging and cooling, the cold reheat steam is mixed with original steam via a steam return pipeline; the flow regulating pore plate is newly arranged on a coldreheat steam pipeline and is used for balancing steam flow; and condensed water at an opening of a shaft seal heater passes the water inlet isolating vale and enters the heat recovery heat exchanger.The system can effectively improve the cold reheat industrial steam supply ability of the boiler, lower the risk of over temperature of a reheater of the boiler, and realize online operation and shutdown. The system can effectively improve the flow of cold reheat steam supply of a unit, and further improve the economic benefits of the unit.

Description

【Technical field】 [0001] The invention belongs to the technical field of energy comprehensive utilization, and relates to a condensed water combined utilization system and method for improving the cold resteam supply capacity of a boiler. 【Background technique】 [0002] External industrial steam supply can effectively reduce the energy consumption index of thermal power generating units, and it is also one of the important profit directions of heating generating units. At the same time, on the basis of meeting the needs of industrial steam supply users for steam parameters, using lower-quality steam as much as possible is conducive to the economical operation of the unit. Therefore, increasing the industrial steam supply volume and reducing the steam supply parameters as much as possible is the direction to improve the industrial steam supply economy of the unit. [0003] At present, most industrial steam supply units use cold resteam as the steam source. However, if more c...

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Problems solved by technology

[0003] At present, most industrial steam supply units use cold resteam as the steam source. However, if more cold resteam is extracted, the boiler reheater is prone to overheating. Due to the constraints of the user, it is impossible to fully meet the needs of users. We can only use the low-temperature reheater with higher steam quality to export steam or even reheat steam.

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