Waterwheel-like chain-box-type vertical fuel conveying device

Abstract

The invention provides a waterwheel-like chain-box-type vertical fuel conveying device. A mechanical transmission part of the device is arranged in a containing body; a driving component is arranged outside the containing body; the upper end and the lower end of the containing body are respectively connected with slotted roller paths. The mechanical transmission part comprises a driving wheel, a driven wheel, a driving chain, and a plurality of chain boxes fixed on the driving chain to hold spherical nuclear fuel elements; the driving wheel is driven by the driving component and drives the driven wheel to rotate by the driving chain; each chain box is a box with an open end; and each box body is provided with a centering guide plate for ensuring that the corresponding spherical nuclear fuel element is located at the center of the chain box. A side wall, in contact with the drive chain, at the open end of the box extends outwards to form a diverting plate for diverting the spherical nuclear fuel elements into the chain boxes or providing a rolling distance for enabling the spherical nuclear fuel elements to enter the slotted roller paths. Mesh between the drive chain and the drive wheels is ensured by correction pieces fixed to the inner side wall of the containing body. The device is reliable in operation, simple in structure and high in economy.

Description

technical field [0001] The invention is a water wheel chain box type fuel vertical conveying device, which is used in the loading and unloading cycle system of spherical nuclear fuel elements in high temperature gas-cooled reactor nuclear power plants, spent fuel unloading systems and new fuel injection systems or similar application fields such as petrochemical and electric power, and belongs to the field of transmission technology field. Background technique [0002] The loading and unloading cycle of spherical nuclear fuel elements in high-temperature gas-cooled reactor nuclear power plants needs to rely on helium compressors to provide the power source for pneumatic transportation required for the lifting of spherical nuclear fuel elements. Unloading and new fuel injection, during the pneumatic cycle transmission process, the spherical nuclear fuel element will continue to rub and collide with the inner wall of the pipeline, the unloading device, the broken ball separati...

AI Technical Summary

Problems solved by technology

[0004] Disadvantage 1: The loading and unloading cycle of spherical nuclear fuel elements adopts helium pneumatic conveying

Under normal working conditions, the spherical nuclear fuel element needs to rely on the helium compressor to provide the power source for the pneumatic transmission during the pneumatic cycle transmission process. The lack of reliability of the helium compressor causes the spherical nuclear fuel element to lose its power source in the cycle, resulting in reactor failure. Passive shutdown; at the same time, in the process of pneumatic circulation transmission, the internal diameter of the pneumatic transmission pipe and the inner wall of the pipe weld are highly demanding and the inner wall is concave. As a result, the spherical nuclear fuel element cannot be transported and circulated, resulting in a passive shutdown of the reactor; the number of spherical nuclear fuel elements in the pneumatic conveying pipeline and the size deviation of the fuel pellets have different requirements on the pneumatic conveying pressure parameters, which intensifies the pressure parameters of the spherical nuclear fuel element. The stagnation and vibration in the pipeline lead to the jamming of the spherical nuclear fuel element and the unstable operation of the system

[0005] Insufficiency 2: Under the conditions of spherical nuclear fuel element jamming accidents, high temperature, high pressure, high radioactive environment and complex pipeline environment, it is difficult to find and check the jamming points of spherical nuclear fuel elements, and maintenance personnel and maintenance tools at some jamming points Unreachable, and excludes the possibility of radioactive leakage due to jamming accidents of spherical nuclear fuel elements

However, in the process of project implementation, the escalator-type fuel transmission device must maintain a certain angle (generally less than 45°) with the horizontal plane, which needs to occupy a large building area and space, and the construction cost is high; the spherical nuclear fuel element adopts multi-stage escalator-type fuel The transmission device and the grooved raceway realize continuous transmission, and the equipment manufacturing and installation precision is high, and the cost is high; the equipment of the escalator-type fuel transmission device is complicated, and there are certain difficulties in maintenance

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