Natural circulation loop system of lead-bismuth alloy

Abstract

The invention discloses a natural circulation loop system of a lead-bismuth alloy. The system comprises a storage tank, a first subchannel, a visual pipeline, a rising pipeline, a condenser, a water pump, a top pipeline, a descending pipeline, a second subchannel and an electric-heating section. The system has the characteristics of being simple in structure and simple and convenient to operate. Based on the secondary heat exchange of the condenser and the electric-heating section, the heat exchange effect of the system is good; pressure gauges and temperature instruments are arranged on all the pipelines of the system while the pipelines are controlled by a valve, so that the safety coefficient of the system is high; the cooling in nuclear industry is carried out by a natural circulation loop, so that the heat energy generated by the nuclear industry is utilized effectively, i.e., the waste of energy sources is avoided. The system not only can be applied to the nuclear industry but also can be applied to scientific research. As a result, the system disclosed by the invention can serve as a practical tool and a scientific-research tool simultaneously.

Description

technical field [0001] The invention belongs to the field of nuclear power generation and mechanical equipment. The invention relates to a natural circulation system, in particular to a lead-bismuth alloy natural circulation loop system used in the nuclear power industry and utilizing a lead-bismuth alloy fluid to cool the nuclear industry. Background technique [0002] ADS (accelerate driven system, accelerator driven system) is one of the most promising transmutation technologies. It consists of a medium-energy high-current proton accelerator, an exogenous neutron generating target and a subcritical reactor, and is a highly efficient nuclear waste transmutation furnace. The basic principle of ADS is as follows: the proton beam generated by the accelerator bombards the heavy metal target in the subcritical reactor, causing a spallation reaction, and then generates neutrons through the internal cascade and external cascade, and the spallation neutron target is the secondary ...

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Problems solved by technology

[0006] The heat exchange device is an important link in ADS. The heat exchange device recorded in the existing patent, such as an O-type lead-bismuth heat exchange device disclosed in the Chinese patent application CN201210191966.9, has a coolant inlet at the top, and The bottom end is provided with a coolant outlet, which completes the flow of the coolant by gravity. In this device, the circulation of the liquid is not completed by filling the liquid with gas. The lead-bismuth liquid in the flow channel of the lead-bismuth alloy in this device The circulating flow is accomplished by gravity, and the flow of coolant in the heat exchange channel in the device is carried out with the help of gravity and external force. Therefore, this heat exchange method has been difficult to keep pace with the development of the nuclear industry

Most of the existing heat exchange systems based on nuclear power are based on forced circulation heat exchange and require power support. Although the effect of heat exchange and cooling can be achieved in this way, other energy sources such as electric energy are lost and wasted in the process, making nuclear power Increased cost and cost of industrial cooling technology

[0007] Due to the scarcity and preciousness of energy, human beings began to develop heat exchange using natural circulation. The passive natural circulation lead-bismuth heat exchange device disclosed in Chinese patent application CN201120502918.8 uses the principle of natural circulation. The structure of the device is complicated, the pipeline is complicated, and there are many natural circulation circuits, and this type of equipment needs inert gas to support the natural circulation, which brings inconvenience to the whole device

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