Cold section steam multi-stage utilization system for enhancing industrial steam supply capacity of once-through boiler

Abstract

The invention relates to a cold section steam multi-stage utilization system for enhancing the industrial steam supply capacity of a once-through boiler. At present, more once-through boilers use cold resteam as steam sources, but if much cold resteam is extracted, a boiler reheater is likely to have an over-temperature risk. The cold section steam multi-stage utilization system for enhancing the industrial steam supply capacity of the once-through boiler comprises a steam turbine high-pressure cylinder (1), a high-pressure heater (2) and a stepped heat exchanger (3), and the steam turbine high-pressure cylinder is connected with the high-pressure heater through a high-pressure heater steam extraction pipeline (4) and connected with the stepped heat exchanger through a steam pipeline (5). A flow adjusting pore plate (6) is installed on the steam pipeline, the stepped heat exchanger is connected to the flow adjusting pore plate in parallel, and feed water of an outlet of the high-pressure heater enters the stepped heat exchanger after passing through a bypass isolating valve (7). The cold section steam multi-stage utilization system is applied to the field of energy gradient utilization.

Description

technical field [0001] The invention relates to a cold section steam multi-stage utilization system which enhances the industrial steam supply capacity of a once-through boiler. Background technique [0002] Now the once-through boiler uses the cold section for industrial steam supply, and its external industrial steam supply can effectively reduce the energy consumption index of the thermal power generation unit, which is also one of the important profit directions of the power generation unit. 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, many once-through boilers use cold resteam as the steam source. ...

AI Technical Summary

Problems solved by technology

[0003] At present, many once-through boilers use cold resteam as the steam source. However, if more cold resteam is extracted, the boiler reheater is prone to the risk of overheating. Therefore, the extraction of cold resteam in many once-through boilers is greatly restricted Restricted, can not fully meet the needs of users, can only use the low-temperature reheater with higher steam quality to export steam or even reheat steam, and the temperature of cold re-steam is generally tens of degrees Celsius higher than the user's demand, and it is necessary to spray desuperheated water to reduce the temperature

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