A long-term water-sealed passive steam discharge device to prevent cooling water loss

Abstract

The invention aims to provide a long-time water seal passive steam discharge device capable of preventing the cooling water loss. The long-time water seal passive steam discharge device capable of preventing the cooling water loss comprises a water seal tank, a U-shaped steam discharge pipe, a backflow drain pipe, and a connecting bridge pipe between the U-shaped steam discharge pipe and the backflow drain pipe; a water seal is formed in the U-shaped steam discharge pipe; the backflow drain pipe is used for enabling condensate water in the water seal tank to flow back to a system; the bridge pipe is used for connecting the U-shaped steam discharge pipe and the backflow drain pipe; an electromagnetic valve on the bridge pipe in a standby state is communicated with a cooling water tank and the U-shaped steam discharge pipe so as to form the long-term water seal; in an accident working condition, the cooling water can be prevented from directly losing from the U-shaped steam discharge pipe. The long-time water seal passive steam discharge device can prevent the cooling water in the water tank from losing, can generate water seal separation for multiple times so as to guarantee the purity of the water quality of the system, moreover, is high in system running reliability, and is easy to overhaul.

Description

technical field [0001] The invention relates to a steam discharge device, in particular to a nuclear safety steam discharge device. Background technique [0002] With the continuous development of the economy and the continuous consumption of world energy, nuclear energy, as a low-carbon and environmentally friendly new energy, is increasingly used to solve the energy problems of human society. Therefore, nuclear safety issues have gradually attracted widespread attention. The containment is the last safety barrier for nuclear power plants to prevent the release of radioactive products into the environment, and its integrity is the key to environmental protection and human health protection. [0003] In the event of a serious accident such as a core meltdown or a large breach in the coolant pipeline, a large amount of high-temperature and high-pressure steam enters the containment, which may cause overpressure of the containment. The passive containment cooling system (PCS s...

AI Technical Summary

Problems solved by technology

Although the existing valves can meet the long-term isolation requirements, they do not have passive characteristics and require manual assistance to achieve the above functions

[0005] In the patent document with the publication number CN103137222A, a "self-starting gas discharge device with long-term water seal function" is disclosed. This device can realize the functions of water seal isolation and gas discharge, but the design of the water supply pipe in the device has defects. , it is impossible to prevent the water in the water tank from being discharged from the water tank through the pipeline under the accident condition, resulting in the loss of cooling capacity and the inability to open the steam discharge device; at the same time, after the accident condition is lifted, the ability to restore the water seal is lacking, and it is difficult to restore the water seal The system is isolated from the external environment; in addition, the device only provides a schematic design, and there are some defects in application and daily maintenance, such as: there is no isolation and drainage device between the device and the cooling water tank, which makes maintenance difficult; the device cannot prevent external Impurities entering the cooling water may cause the cooling water to pollute the water quality of the entire system during the circulation process

Patent CN103474109A also discloses a steam discharge device, which can also achieve effective isolation, but since the water replenishment pipe and the water seal tank are always connected, when the pressure in the water tank rises after the accident, the water in the tank may Loss through make-up pipes, resulting in reduced cooling capacity

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