Open passive heat extraction system suitable for long-term operation condition

Abstract

The invention provides an open passive heat extraction system suitable for long-term operation condition, comprising: a heat exchange water tank, a filter device, a mass flowmeter, a heat exchanger, a bubble generator, a gas storage tank, a temperature sensor and other corresponding valve pipes. Compared with traditional passive heat extraction systems, the system is provided with the additional bubble generator, and heat changing capacity of the system is improved by means of adjusting gas injection according to system operation condition; by using peripheral gas injection, it is possible to effectively reduce additional resistance intervening a circulating loop; equipment is simple, easy to operate and capable of uniform bubbling, stable bubble flows can be generated, natural circulating capacity of the passive heat extraction system can be enhanced, the problem that reduced system heat exchanging capacity and instable flashing flow occur in long-term operation condition is solved, the passive characteristic of the system can be retained, and the passive heat extraction system is safer and more reliable.

Description

technical field [0001] The invention relates to an open passive heat derivation system suitable for long-term operating conditions, and is suitable for cooling systems in the field of nuclear reactor safety technology. Background technique [0002] In order to ensure the operational safety of the reactor, the design of the new generation reactor mainly adopts a safety system combining active and passive technologies. In the hypothetical serious accident situation, the long-term effective operation of the passive safety system plays a vital role in extracting the waste heat from the core and ensuring the integrity of the reactor core and containment shell. When designing a new generation of reactor containment cooling system, the open passive heat export system has attracted the attention of scholars from various countries because of its less heat transfer links and simple system structure. The main feature of the system is low operating pressure, prone to unstable flash flo...

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Problems solved by technology

The bubble lift pumps proposed in these documents and invention patents are not suitable for open passive heat export systems. On the one hand, it is difficult to control the proportion of bubbles generated by direct heating; on the other hand, the interventional structure will affect the fluid in the natural circulation loop. flow and increase the resistance of the circuit

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