Helium-filled system for removing grains in gas

Abstract

The invention discloses a helium-filled system for removing grains in gas and belongs to the technical field of safety and environmental protection of a nuclear power plant. When a serious accident happens in the nuclear power plant, the inner pressure of a safety shell is increased, a connecting valve is opened and grains are conveyed to a helium box through a pipeline; the helium box is a pressure-bearing stainless steel box with a water-cooling wall; due to thermophoresis and turbulence effects, the grains are deposited in the helium box; and meanwhile, a helium containing box is cooled by a water pipe of an external device, so as to form a temperature field with a certain gradient in the helium containing box; and helium has a higher heat conductance, so that the thermophoresis deposition is higher in efficiency. A removing device is mounted on the exterior of the safety shell of the nuclear power plant, the implementation is convenient and the control is simple, so that the safe, efficient and reliable running of the nuclear power plant is ensured.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant safety and environmental protection, and in particular relates to a helium-filled gas particle removal system. Background technique [0002] In today's energy shortage in the world, nuclear power is the only energy that can achieve continuous power supply except for fossil energy. After the third nuclear power plant accident in Fukushima, Japan in 2011, the Chinese government established the basic policy of "safe and efficient" development of nuclear power. Therefore, it is a very important task to develop and develop effective measures to deal with severe nuclear power accidents. [0003] Radioactive particulate matter produced during severe accidents at nuclear power plants is of greatest concern. As we all know, even non-radioactive particles are extremely harmful to humans, PM 10 , PM 2.5 Such fine particulate matter has become an important problem that the international commun...

AI Technical Summary

Problems solved by technology

Even the fourth-generation supercritical water reactors have special problems in the movement of particles due to the characteristics of supercritical water, which affects the safety of the surrounding environment

The generation of graphite dust in high-temperature gas-cooled reactors will also cause a series of problems, and may affect the safety and normal operation of the reactor

In the generation IV sodium-cooled fast reactor, the migration of accidental sodium particles will also endanger the safety of the system and the safety of people around it

At present, the removal of particulate matter in nuclear power plants mainly includes French-made sand pile filters, Swedish pebble filters, and German Venturi tube water filters. These measures have a better filtering effect on larger debris produced by severe nuclear power plant accidents , but the removal effect of fine particles is not good

The problem of fine particle removal is also a problem in the energy industry. Except for the better effect of electrostatic precipitators, there are no effective measures to form products

However, electrostatic precipitators cannot be widely used in nuclear power plants due to their low power and other issues.

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