A spiral flow anti-sedimentation inverted U-shaped tube

Abstract

The invention discloses a spiral flow type anti-deposition reverse U-shaped pipe for a steam generator. The spiral flow type anti-deposition reverse U-shaped pipe comprises a barrel-shaped reverse U-shaped pipe wall and a spiral baffle plate arranged in the wall, the spiral surface of the spiral baffle plate is formed through the spiral movement of a straight line segment perpendicular to the central line of the reverse U-shaped pipe, wherein the length of the straight line segment is equal to the radius of the reverse U-shaped pipe, the outer edge of the spiral baffle plate is connected with the inner wall of the reverse U-shaped pipe, and the spiral angle of the spiral baffle plate is 20 to 50 degrees. By means of the spiral baffle plate, the original linear flow of the fluid is changed into continuous spiral flow, and a heat transfer pipe bundle is scoured in a spiral flow mode to prevent particulate matter depositing on the pipe wall. The reverse U-shaped pipe is featured with simple structure and convenience in assembling and disassembling and capable of effectively improving the economical efficiency, safety and reliability of the U-shaped pipe of the steam generator.

Description

technical field [0001] The invention relates to the fields of mechanical equipment and nuclear energy, and relates to a spiral flow anti-deposition inverted U-shaped tube for a steam generator. Background technique [0002] A nuclear power plant is a power plant that uses the energy released by nuclear fission or fusion reactions to generate electricity. The interior of a nuclear power plant usually consists of a primary loop system and a secondary loop system. The reactor is the heart of a nuclear power plant. The heat energy released by the reactor during operation is taken out by the coolant of the primary loop system to generate steam. Therefore, the entire primary loop system is called "nuclear steam supply system", which is equivalent to the boiler system of a thermal power plant. The secondary circuit system, in which the steam drives the turbogenerator to generate electricity, is basically the same as the turbogenerator system in a thermal power plant. [0003] S...

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Problems solved by technology

[0011] In order to solve the problem of reduced safety and reliability and economical decline of nuclear power plants caused by the adhesion of particulate matter in the inverted U-shaped tube in the primary circuit system, the inventors have carried out dedicated research, and found that: through the inverted U-shaped tube The helical baffle is set in the middle, which has a good guiding effect on the coolant of the primary circuit, and changes the flow mode of the coolant in the primary circuit from a straight flow to a continuous spiral flow. The loop coolant is in the form of a spiral plunger flow, which produces a velocity gradient in the radial direction of the shell side cross section. Since each inverted U-shaped tube heat exchange tube in the steam generator is placed in the primary loop coolant as the heat exchange medium In the vortex, the degree of radial turbulence of the fluid in the primary circuit coolant is improved, which is conducive to scouring the particles and sediments in the shell side, and effectively prevents the particles from depositing on the wall of the inverted U-shaped tube, thereby completing the present invention

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