Once-through type steam generator of nuclear power station

Abstract

The invention provides a once-through type steam generator of a nuclear power station. The once-through type steam generator of nuclear power station comprises a water supply distribution box, a heattransmission pipe, a redistribution header and a steam collection box. The water supply distribution box, the redistribution header and the steam collection box communicate in sequence, wherein the water supply distribution box communicates with the redistribution header through the heat transmission pipe, and the redistribution header communicates with the steam collection box through the heat transmission pipe. The once-through type steam generator of the nuclear power station is different from a traditional once-through type steam generator, the redistribution header is additionally arranged in the once-through type steam generator for relieving the nonuniform flowing resistance problem caused by nonuniform flowing and heat transmission and especially for relieving the problem of the nonuniform steam quality under the low power and during load regulation, meanwhile, the redistribution header is further provided with heat transmission pipe overhaul holes, so that in-service inspection and pipe blocking operation of the heat transmission pipe are facilitated, and the stability and safety of the steam generator are improved through the design.

Description

technical field [0001] The invention relates to a steam generator for a nuclear power plant, in particular to a once-through steam generator for a nuclear power plant. Background technique [0002] There are two types of steam generators widely used in pressurized water reactor nuclear power plants, one is a saturated steam generator with a steam-water separator, and the other is a once-through steam generator. For the saturated steam generator, the water in the primary circuit flows in the tube bundle composed of U-shaped tubes connected by the tube plate, and a steam-water separator and a steam drying device are installed above the tube bundle. The saturated steam generator has the advantages of large heat transfer coefficient, large water storage volume, and low requirements on the feed water and steam control system, but the saturated steam temperature and pressure are relatively low, and the corresponding secondary circuit efficiency is low. In addition, the structure o...

AI Technical Summary

Problems solved by technology

However, due to the low power of small reactors and relatively high load regulation requirements, the uneven flow and heat transfer in the once-through steam generator heat transfer tubes are more obvious

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