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Passive residual heat discharge system and method for steam pipeline with normally closed isolation valve

A technology of passive waste heat and steam pipelines, applied in steam generation methods, steam generation methods using heat carriers, steam generation, etc., can solve the risk of steam pipeline rupture accidents, hidden dangers of steam pipeline rupture, and pipeline layout requirements by reducing the difficulty of pipelines Extremely high-level problems, to achieve the effect of mature theoretical foundation, simple configuration, and improved security

Pending Publication Date: 2019-12-20
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a passive waste heat discharge system and method in which the steam pipeline isolation valve is normally closed, so as to solve the problem that the steam pipeline isolation valve of the passive waste heat discharge system in the prior art needs to be normally open, and the interior is always filled with high temperature and high pressure. Steam, not only has extremely high requirements for pipeline layout, but also has serious hidden dangers of steam pipeline rupture. When the passive system is not in operation, the system steam pipeline is effectively isolated from the main steam pipeline, reducing the difficulty of pipeline layout and steam pipeline rupture. The risk of accidents, so that the passive waste heat removal system can be applied to the purpose of retrofit nuclear power units

Method used

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  • Passive residual heat discharge system and method for steam pipeline with normally closed isolation valve
  • Passive residual heat discharge system and method for steam pipeline with normally closed isolation valve

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Effect test

Embodiment 1

[0033] Such as figure 1A passive waste heat removal system with the steam pipeline isolation valve normally closed is shown, including a steam pipeline 1, a condensate pipeline 7, a steam pipeline isolation valve 2 located on the steam pipeline 1, and a condensate pipeline located on the condensate pipeline 7 The isolation valve 6, a heat exchanger 5 is arranged between the steam pipeline 1 and the condensate pipeline 7, and also includes a water seal 4 located between the steam pipeline isolation valve 2 and the heat exchanger 5, and the water seal 4 is connected to the steam pipeline A constant pressure device is set between the isolation valves 2. In this embodiment, the constant pressure device is the discharge valve 3 , and the discharge valve 3 is close to the water seal 4 .

[0034] In the figure, the dotted line box on the left indicates the containment vessel, and the dotted line box on the right indicates the longer steam pipeline and condensate pipeline; and there ...

Embodiment 2

[0048] Such as figure 1 A passive waste heat removal system with the steam pipeline isolation valve normally closed is shown, including a steam pipeline 1, a condensate pipeline 7, a steam pipeline isolation valve 2 located on the steam pipeline 1, and a condensate pipeline located on the condensate pipeline 7 The isolation valve 6, a heat exchanger 5 is arranged between the steam pipeline 1 and the condensate pipeline 7, and it is characterized in that it also includes a water seal 4 located between the steam pipeline isolation valve 2 and the heat exchanger 5, the water seal A constant pressure device is set between 4 and the steam pipeline isolation valve 2, and the heat exchanger 5 is located in the hot trap water tank 8. The steam line 1 is connected to the steam outlet of the steam generator, and the condensation water line 7 is connected to the feed water inlet of the steam generator. In this embodiment, the constant pressure device is a low-temperature steam charging ...

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Abstract

The invention discloses a passive residual heat discharge system and method for a steam pipeline with a normally closed isolation valve. The system comprises the steam pipeline, a condensed water pipeline, a steam pipeline isolation valve, a condensed water pipeline isolation valve as well as a water seal, wherein the steam pipeline isolation valve is located on the steam pipeline; the condensed water pipeline isolation valve is located on the condensed water pipeline; a heat exchanger is arranged between the steam pipeline and the condensed water pipeline; the water sea is located between thesteam pipeline isolation valve and the heat exchanger; and a constant pressure device is arranged between the water seal and the steam pipeline isolation valve. The invention aims to solve the problems in the prior art that a steam pipeline isolation valve of a passive residual heat discharge system needs to be normally opened, the passive residual heat discharge system is always filled with high-temperature and high-pressure steam, the requirement on pipeline arrangement is extremely high, and serious hidden danger of steam pipeline breakage can be cause. A system steam pipeline and a main steam pipeline are effectively isolated when the passive system is not operated, difficulties of pipeline arrangement and the risk of steam pipeline breakage accidents are reduced, and the purpose thatthe passive residual heat discharge system can be applied to improvement of a nuclear power unit is achieved.

Description

technical field [0001] The invention relates to the field of nuclear reactor safety, in particular to a passive waste heat discharge system and method in which a steam pipeline isolation valve is normally closed. Background technique [0002] When the nuclear reactor has a power outage and auxiliary feedwater loss accident, the reactor loses its waste heat export capability and needs to use the passive waste heat removal system to export the waste heat. The conventional secondary side passive waste heat removal system operation strategy, the steam pipeline isolation valve is Normally open, the condensate pipeline isolation valve is normally closed, and the condensate pipeline isolation valve is automatically opened when the system is put into operation. If the operation strategy of the conventional passive residual discharge system on the secondary side is adopted and applied to the improved nuclear power unit, there will be the following insurmountable difficulties: the exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21D3/06F22B1/02F22D11/06
CPCF22B1/023F22D11/06G21D3/06Y02E30/00
Inventor 鲜麟李峰冉旭杨帆周科张丹邱志方张玉龙曹思民李海颖卢毅力吴清
Owner NUCLEAR POWER INSTITUTE OF CHINA