Plate-type heat exchanger core body applied to nuclear power system

Abstract

The invention discloses a plate-type heat exchange core body applied to a nuclear power system. The core body comprises a plurality of plate pairs constituted of plate sheets, wherein each of the plate sheets is of a concave-convex rippled unit topological structure with a hexagonal or right quadrilateral cellular arrangement, and each of the rippled units on each of the plate sheets comprises convex ripples and concave ripples which are arranged in a staggered manner; the two plate sheets which constitute one group of the plate pairs are mutually buckled together, outer walls of the concave ripples which are mutually touched are welded and sealed, and a cold medium side flow way is formed by outer walls of the convex ripples in the two plate sheets; outer walls of the convex ripples, which are mutually contacted, of the two overlaid and adjacent groups of plate pairs are welded and sealed, and a fused salt side flow way is formed by outer walls of the concave ripples in the two groupsof plate pairs; the fused salt side flow way and the cold medium side flow way are mutually perpendicular and have no intersection point; and lateral edges of the plate pairs are welded and sealed with connecting plates. By the cellular structure, high-temperature fused salt on the whole plate sheet is uniformly cooled, so heat exchange of the plate sheet can be completed under a durable temperature, and smooth circulation of the fused salt is ensured.

Description

technical field [0001] The invention relates to the technical field of heat exchange equipment, in particular to a core body of a plate heat exchanger for a nuclear power system. Background technique [0002] The molten salt reactor nuclear energy system is the only liquid fuel reactor among the candidate reactors of the fourth-generation advanced nuclear energy system. It is considered to be an ideal reactor type for the utilization of thorium resources. Better diffusion performance and economy. Molten salt reactor is a kind of nuclear fission reactor. Its main coolant is a molten mixed salt, which can maintain low vapor pressure when working at high temperature, thereby reducing mechanical stress and improving equipment safety. Molten salt reactors use high-temperature molten salt as a coolant, which has thermal properties such as high temperature, low pressure, high chemical stability, and high heat capacity. It does not need to use heavy and expensive pressure vessels, ...

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Problems solved by technology

[0003] The operating temperature of the high-temperature molten salt in the molten salt reactor is above 700°C, which is equivalent to the pressure difference between the hot and cold sides of the heat exchange equipment at room temperature reaching 10MPa, which requires the heat exchange core to withstand high pressure, and the core of an ordinary plate heat exchanger can withstand pressure The difference is generally below 6MPa; although the microchannel heat exchanger (PCHE) heat exchanger core can withstand a pressure difference of 60MPa, the diameter of the medium circulation channel in the core of the heat exchange equipment is only about 0.5-1mm, and the viscosity of the molten salt is large. , prone to problems such as flow difficulties, which severely limit the application of microchannel heat exchangers in molten salt reactor systems

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