Vertical type natural circulation steam generator

Abstract

The invention relates to a vertical type natural circulation steam generator. The vertical type natural circulation steam generator comprises a tank body, multiple U-shaped heat exchange pipes and a supporting assembly. The tank body comprises an inlet and an outlet, and a heat exchange cavity is formed inside the tank body. The multiple U-shaped heat exchange pipes are arranged in the heat exchange cavity of the tank body. The supporting assembly supports the multiple U-shaped heat exchange pipes. The supporting assembly comprises multiple first supporting plates which are arranged in the heat exchange cavity at intervals in sequence from the inlet side to the outlet side. First through holes are formed in the first supporting plates, a heat exchange channel which allows the cooling waterto flow and pass through is formed between every two adjacent first supporting plates, and the flowing direction of the cooling water which flows through the heat exchange channels can extend in theleft-and-right direction of the steam generator. The existing longitudinal sweeping type heat exchange of the cooling water is changed to the heat exchange which utilizes the transverse sweeping typeas the main type, the heat exchange effect is remarkably improved, the phenomenon of the temperature non-uniformity of the cold and heat ends of a U-shaped heat transfer pipe is eliminated, and therefore the impact and vibration hidden danger which is generated due to the fact that in the prior art, the flow of the cooling water of the cold end and the heat end of a heat exchange pipe is not uniform is avoided.

Description

technical field [0001] The invention relates to the technical field of steam generators for pressurized water reactor nuclear power plants, in particular to a vertical natural circulation steam generator. Background technique [0002] The steam generator is a device that transfers the heat of the coolant in the primary circuit to the feed water of the secondary circuit through heat exchange through the heat transfer tube, and generates saturated steam to supply the power plant of the secondary circuit. Domestic nuclear power plants generally use vertical, inverted U-shaped heat transfer tubes, and natural circulation steam generators. The heat exchange method of the existing vertical natural circulation steam generator is as follows: the cooling water on the secondary side flows through the outer side of the heat transfer tube from bottom to top in the form of vertical sweep, and exchanges heat with the high-temperature coolant inside the heat transfer tube to generate a ste...

AI Technical Summary

Problems solved by technology

Therefore, in the process of operation, it is necessary to match different secondary side flows to the cold end and the hot end, and the fluid impact caused by uneven flow can cause abnormal vibration and fretting wear of the heat transfer tube

In the gap between the heat transfer tubes on the support plate, the single longitudinal sweeping flow makes it easier for scale and corrosion products to deposit on the support plate to form fouling, which affects the flow of coolant on the secondary side and reduces the heat transfer performance of the heat transfer tube

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