CN-117665241-B - System for removing non-condensable gas and detection method for content of non-condensable gas

Abstract

A system for removing noncondensable gas and a method for detecting the content of the noncondensable gas are provided, wherein a heater is arranged in a pressure container, a water outlet of the pressure container is connected to a condenser through a pressure container output pipeline, the condenser is connected with a cooling water inlet pipe, a cooling water outlet pipe, a liquid condensate water outlet pipe and an air outlet pipeline, the other end of the liquid condensate water outlet pipe is connected to a water inlet of the pressure container, a liquid flow sensor is arranged on the liquid condensate water outlet pipe, a gas flow sensor and a humidity sensor are respectively arranged on the air outlet pipeline, the liquid flow sensor, the gas flow sensor and the humidity sensor are all connected to a central controller, and the output end of the central controller is connected to the heater through a voltage regulating power supply. The invention can adjust the heating power in real time by detecting the condensed water and the non-condensable gas flow and combining the water content of the non-condensable gas, and automatically finish the preparation process by judging the water content of the discharged non-condensable gas.

Inventors

• ZHANG JUNQI
• YIN SHIJIE
• LIU TING
• XIE YI

Assignees

• 中国电建集团河南省电力勘测设计院有限公司
• 中国电建集团华中电力设计研究院有限公司

Dates

Publication Date

20260512

Application Date

20231230

Claims (1)

1. 1.A method for detecting the content of non-condensable gas is characterized by comprising the following steps: The system for removing the non-condensable gas comprises a pressure container (1), wherein a heater (2) is arranged in the pressure container (1), a water outlet of the pressure container (1) is connected to a condenser (3) through a pressure container output pipeline (101), the condenser (3) is connected with a cooling water inlet pipe (102), a cooling water outlet pipe (103), a liquid condensed water outlet pipe (104) and an air outlet pipeline (105), the cooling water inlet pipe (102) and the cooling water outlet pipe (103) are respectively connected with two ends of a condensing coil, the other end of the liquid condensed water outlet pipe (104) is connected to a water inlet of the pressure container (1), a liquid flow sensor (4) is arranged on the liquid condensed water outlet pipe (104), a gas flow sensor (5) and a humidity sensor (6) are respectively arranged on the air outlet pipeline (105), the liquid flow sensor (4), the gas flow sensor (5) and the humidity sensor (6) are all connected to a central controller (7), and the output end of the central controller (7) is connected to the heater (2) through a voltage regulating power supply (8); the detection method comprises the following steps: The method comprises the steps that 1, a central controller (7) outputs control signals to a voltage-regulating power supply (8) to enable a heater (2) to heat purified water subjected to desalination treatment until boiling according to initial power P 0 , and meanwhile, the central controller (7) receives detection signals of a liquid flow sensor (4), a gas flow sensor (5) and a humidity sensor (6) in real time; Step 2, detecting the flow of a liquid condensate water outlet pipe (104) by a liquid flow sensor (4) so as to judge whether the water in the pressure vessel (1) is in a boiling state, if the liquid condensate water outlet pipe (104) has no flow, the water in the pressure vessel (1) is proved to be not boiled, and controlling the output power P 1 ,P 1 ＞P 0 of a power supply by a central controller (7) until the water is boiled; Step 3, detecting whether the discharged gas contains water vapor or not by the humidity sensor (6), namely, whether the gas outlet pipeline (105) contains water vapor or not, if the gas outlet pipeline (105) does not contain water vapor, maintaining the output power P 1 , if the humidity sensor (6) detects that the gas outlet pipeline (105) contains water vapor, indicating that the current power is overlarge, reducing water in the pressure container (1), sending a heating power reducing signal by a computer, and outputting the power P 2 ,P 0 ＜P 2 ＜P 1 by the voltage regulating power supply (8); Step 4, a gas flow sensor (5) detects whether the gas flow in the gas outlet pipeline (105) is contained, namely whether noncondensable gas is discharged, if the gas outlet pipeline (105) is discharged, the current output power is maintained, the degassing process is continued, and if the gas outlet pipeline (105) is not discharged, the step 5 is carried out; step 5, if no gas is discharged from the gas outlet pipeline (105), combining signals of the liquid flow sensor (4), and comprehensively judging: if the liquid flow sensor (4) has no flow, the current heating power is insufficient, and at the moment, the central controller (7) controls the voltage regulating power supply (8) to increase the heating power and output the power P 3 ,P 0 ＜P 2 ＜P 3 ＜P 1 ; If the liquid flow sensor (4) has flow and the gas flow sensor (5) has no signal, the non-condensable gas in the water of the system is completely removed, the degassing process is ended, and the central controller (7) cuts off the voltage-regulating power supply (8) and sends a signal to indicate that the flow is completed.

Description

System for removing non-condensable gas and detection method for content of non-condensable gas Technical Field The invention relates to a system for removing non-condensable gas, which is used for experimental study of thermohydraulics of a reactor core and a steam generator by using prepared deionized water without non-condensable gas. Background The non-condensable gas refers to air, hydrogen, nitrogen, lubricating oil vapor, etc. mixed in the refrigeration system. These gases circulate with the refrigerant in the system without condensing with the refrigerant and without producing refrigeration effects. In a nuclear reactor system, non-condensable gases may accumulate in a coolant system, the working fluid of which may decompose into such gases during operation. These gases block the heat dissipation of condensation, which may block coolant flow paths, combustion, and/or other undesirable chemical interactions. In particular, in a radioactive environment such as a nuclear reactor coolant system, the coolant may be subject to radiolysis. Particularly in passive coolant systems that use natural circulation between specially arranged heat sources and heat sinks to avoid reliance on active components or operator intervention, non-condensable gases may impede or block such circulation, deplete coolant volumes, and/or may burn, corrode or otherwise produce negative reactions in such systems. Thus, nuclear reactor passive coolant systems, such as ICS, accumulate particularly undesirable non-condensable gases. US20230395271A1 discloses a system and method for reducing non-condensable gas accumulation in a coolant system, although it may be reduced, but not removed. The main method for removing the non-condensable gas is to repeatedly heat the experimental water, but no effective method is available for removing and detecting the content of the non-condensable gas. Disclosure of Invention Aiming at the technical problem that non-condensable gas cannot be removed in the prior art, the invention provides a system for removing non-condensable gas and a detection method for the content of non-condensable gas. In order to achieve the above purpose, the invention is realized by the following technical scheme: A system for removing noncondensable gas comprises a pressure container, wherein a heater is arranged in the pressure container, a water outlet of the pressure container is connected to a condenser through a pressure container output pipeline, the condenser is connected with a cooling water inlet pipe, a cooling water outlet pipe, a liquid condensed water outlet pipe and an air outlet pipeline, the cooling water inlet pipe and the cooling water outlet pipe are respectively connected with two ends of a condensing coil, the other end of the liquid condensed water outlet pipe is connected to a water inlet of the pressure container, a liquid flow sensor is arranged on the liquid condensed water outlet pipe, a gas flow sensor and a humidity sensor are respectively arranged on an air outlet pipeline, the liquid flow sensor, the gas flow sensor and the humidity sensor are all connected to a central controller, and an output end of the central controller is connected to the heater through a voltage regulating power supply. The heater is an electric heater. A detection method for the content of non-condensable gas by adopting the system comprises the following steps: The method comprises the steps that step 1, a central controller outputs a control signal to a voltage regulating power supply to enable a heater to heat purified water subjected to desalination treatment until boiling according to initial power P 0, and meanwhile, the central controller receives detection signals of a liquid flow sensor, a gas flow sensor and a humidity sensor in real time; Step 2, detecting the flow rate of the liquid condensate water outlet pipe by a liquid flow sensor so as to judge whether the water in the pressure vessel is in a boiling state, and if the flow rate of the liquid condensate water outlet pipe is not high, proving that the water in the pressure vessel is not boiling, controlling the output power P 1,P1＞P0 of the voltage regulating power by the central controller until the water is boiling; Step 3, detecting whether the discharged gas contains water vapor or not by a humidity sensor, namely, whether the gas outlet pipeline contains water vapor or not, if the gas outlet pipeline does not contain water vapor, maintaining the output power P 1, if the humidity sensor detects that the gas outlet pipeline contains water vapor, indicating that the current power is overlarge, reducing the water in the pressure container, sending a heating power reducing signal by a computer, and regulating the output power P 2,P0＜P2＜P1 of the power supply; step 4, the gas flow sensor detects whether the gas flow is contained in the gas outlet pipeline, namely whether noncondensable gas is discharged, if the gas is discharged in the gas outlet pipeli