Steam generator with axial-flow preheater

By designing a combined structure with axial flow preheater in the steam generator, the problem that traditional design cannot meet the fluid distribution requirements of high-efficiency steam generators is solved, and more efficient heat exchange efficiency and more stable operating state are achieved.

CN119642174APending Publication Date: 2025-03-18NUCLEAR POWER INSTITUTE OF CHINA
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Patent Information

Application Number
CN202411814763.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The axial flow preheater in traditional natural circulation steam generators cannot meet the requirements of the new high-efficiency steam generators for secondary fluid distribution, especially at higher flow rates, which makes it difficult to ensure the reliability of the water supply distribution structure and the fluid resistance characteristics.

Method used

A steam generator with an axial flow preheater was designed. Through an internal combined structure, a secondary side partition plate, a double-layer sleeve descending channel and a semi-ring main water feed distribution device were used to realize the specified proportional distribution of water feed and recirculated water on both the cold and hot sides.

Benefits of technology

The heat exchange efficiency of the steam generator is improved by about 20%, the operation mode is simple, the automatic adaptability of various working conditions is strong, and the operating state is stable.

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Abstract

The invention belongs to the technical field of nuclear reactor systems, and particularly relates to a steam generator with an axial-flow preheater. A middle end socket assembly and a lower end socket assembly are connected with the lower end of a lower cylinder body, a tube plate is fixedly installed at the bottom in the lower cylinder body, the inner diameter of the lower cylinder body is smaller than that of an upper cylinder body, a conical cylinder body is arranged between the lower cylinder body and the upper cylinder body, an upper end socket is installed at the upper end of the upper cylinder body, and a heat transfer tube bundle is installed on the tube plate. The heat transfer tube bundle penetrates through the tube plate and then is communicated with the lower sealing head assembly to form a loop, a water inlet and a water outlet are formed in the bottom of the lower sealing head assembly, a steam-water separation device is installed on the top in the upper sealing head, and the axial flow type preheater is arranged in the steam generator. And flow control is carried out through a semi-annular pore plate at the inlet of the cold side descending channel. According to the invention, the specified proportion distribution of the feed water and the recirculating water of the steam generator on the cold side and the hot side of the secondary side can be realized, and the running state is stable.
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