CN110783006A - Degassing test device and method - Google Patents
Degassing test device and method Download PDFInfo
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- CN110783006A CN110783006A CN201911141649.4A CN201911141649A CN110783006A CN 110783006 A CN110783006 A CN 110783006A CN 201911141649 A CN201911141649 A CN 201911141649A CN 110783006 A CN110783006 A CN 110783006A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/001—Mechanical simulators
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/02—Devices or arrangements for monitoring coolant or moderator
- G21C17/022—Devices or arrangements for monitoring coolant or moderator for monitoring liquid coolants or moderators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a degassing test device and a degassing test method, wherein the device comprises: the device comprises a coolant circulation loop, an exhaust branch, a spraying branch, an air-entrapping branch and a pressure stabilizing branch; the device and the method can simulate the degassing dynamic characteristic of the primary loop of the reactor and research parameters influencing the degassing efficiency of the pressure stabilizer, provide parameter verification for a primary loop degassing model of the reactor and provide data reference for the design of a degassing scheme.
Description
Technical Field
The invention relates to the field of dissolved gas degassing, in particular to a degassing test device and method for a pressurized water reactor coolant under a high-temperature and high-pressure condition.
Background
In the pressurized water reactor coolant, various gases are dissolved, which are derived from dissolved gases in the coolant, chemical additives and radiation decomposition products of water, fission gases released from fuel elements, and the like. As the reactor is operated for a long period of time, the dissolved radioactive gas concentration continues to increase with time. Of the radioactive gases, the most harmful gases are the isotopes of krypton and xenon
85Kr、
133Xe and
135xe, which leaks into the air, causing the radioactivity in the air to exceed radioprotective standards, endangering staff health. Measures must therefore be taken to remove the dissolved radioactive gas from the coolant. And the corresponding degassing device or method is lacked in the prior art.
Disclosure of Invention
The invention provides a test device for simulating a degassing process of a pressurized water reactor primary circuit pressure stabilizer and a thermal physical degassing process method for overcoming the defects in the prior art, and aims to simulate the primary circuit degassing dynamic characteristic of a reactor and research parameters influencing the degassing efficiency of the pressure stabilizer. Parameter verification is provided for a reactor primary loop degassing model, and data reference is provided for degassing scheme design.
The theory of dissolution and migration of gases in dilute solutions of low concentration under high temperature and pressure conditions is outlined by henry's law on gas solubility. Henry's law states that: at constant temperature and equilibrium, the partial pressure of a certain gas in solution in the gas phase is proportional to the concentration of the gas in the liquid phase:
C
i＝K
iP
i(1)
(1) in the formula, C
iIs the concentration of a gas in solution, kg/kg (H2O); p
iIs the partial pressure of a gas in the gas phase, Pa; k
iIs the Henry's law constant for a gas, Pa-1. This law states that as the gas concentration in the liquid phase increases, the initial equilibrium is broken and the gas in the liquid phase migrates into the gas phase until a new equilibrium is reached; and vice versa. Temperature riseIn time, the solubility of volatile gases is reduced, K
iAnd decreases. Based on the theory of dissolution and migration of gas, the Henry's law is reasonably utilized, and the existing equipment and system of the primary loop can be utilized to the maximum extent by utilizing the steam pressure stabilizer as a thermophysical degasser to purify the gas dissolved in the coolant of the primary loop, so that the method is a saving, convenient and effective method.
The invention provides a steam pressure stabilizer degassing simulation test device and a thermal physical degassing process method under the conditions of high temperature and high pressure, which are used for simulating a pressurized water reactor primary circuit pressure stabilizer degassing process and researching parameters influencing the degassing efficiency of the pressure stabilizer.
The degassing test apparatus of the present invention comprises:
the device comprises a coolant circulation loop, an exhaust branch, a spraying branch, an air-entrapping branch and a pressure stabilizing branch;
the coolant circulation circuit includes: the system comprises a main circulating pump, a coolant circulating pipeline and a heat exchange branch; the both ends of coolant circulation pipeline are connected with the play liquid end and the feed liquor end of main circulating pump respectively, and main circulating pump is used for making return circuit coolant at the pipeline inner loop flow, and the heat transfer branch road includes: one end of the heat exchange pipeline is communicated with the coolant circulation pipeline, the other end of the heat exchange pipeline is communicated with the coolant circulation pipeline after being connected with the heat exchanger, and the heat exchanger is used for maintaining the temperature of the loop coolant to be stable;
the voltage stabilizing branch includes: the system comprises a pressure stabilizer and a pressure stabilizing pipeline, wherein one end of the pressure stabilizing pipeline is communicated with a liquid outlet hole of the pressure stabilizer, the other end of the pressure stabilizing pipeline is communicated with a coolant circulating pipeline on the side of a liquid inlet end of a main circulating pump, the pressure stabilizer heats part of coolant into steam, compensates pressure reduction caused by spraying and steam exhaust, and transmits the coolant back to the coolant circulating pipeline through the pressure stabilizing pipeline;
one end of the exhaust branch extends into the steam space of the pressure stabilizer, and the exhaust branch is used for exhausting dissolved gas in the steam space of the pressure stabilizer;
the branch road sprays includes: one end of the spraying pipeline is communicated with a coolant circulating pipeline on the liquid outlet side of the main circulating pump, one end of the spraying pipeline is connected with the atomizing nozzle positioned at the top in the pressure stabilizer, and the spraying branch is used for spraying loop coolant into a pressure stabilizer steam space;
the gas filling branch comprises: the system comprises a gas adding tank and a gas adding pipeline, wherein one end of the gas adding pipeline is communicated with the gas adding tank, and the other end of the gas adding pipeline is communicated with a coolant circulating pipeline on the liquid inlet side of a main circulating pump;
the pipeline of the device is provided with a plurality of measuring points for sampling and measuring the concentration of the dissolved gas at each position of the loop in real time.
Preferably, the pipeline of the device is provided with 4 measuring points which are respectively a measuring point a, a measuring point b, a measuring point c and a measuring point d, wherein the measuring point a is positioned on the spraying pipeline, the measuring point b is positioned on the exhaust branch pipeline, the measuring point c is positioned on the pressure stabilizing pipeline, and the measuring point d is positioned on the coolant circulating pipeline at the liquid inlet end side of the main circulating pump.
Preferably, the exhaust branch is provided with a first flow meter and a first electric control valve.
Preferably, the spraying branch is provided with a second flow meter and a second electric regulating valve.
Preferably, a stop valve is installed on the gas filling pipeline.
Preferably, the coolant circulating pipeline is sequentially provided with the following components from the liquid outlet end to the liquid inlet end of the main circulating pump: the heat exchange branch is connected with two ends of the fourth electric regulating valve in parallel, and the flow meter and the fifth electric regulating valve are installed on the heat exchange branch.
Preferably, an electric heater is installed at the bottom in the voltage stabilizer, and the electric heater is used for heating part of the coolant into steam.
The outgassing test method of the present invention comprises:
(1) the gas adding tank is isolated from the loop, the gas filling tank is connected with the gas cylinder after being filled with water, water is discharged while the gas filling tank is filled with dissolved gas, after the liquid level in the gas filling tank reaches the lowest point, the water discharge valve is closed, the gas is continuously filled to half of the operating pressure of the loop, the booster pump is started, high-pressure water is atomized by the atomizing nozzle and then is sprayed into the gas adding tank to fill the gas filling tank, the dissolved gas with saturated concentration is dissolved in the water in the gas filling tank, the booster pump is closed after the pressure in the gas filling tank is increased to the operating pressure of the loop, and at the moment, the gas to be removed with;
(2) starting a voltage stabilizer to boost pressure, filling deionized water in a coolant circulation loop, exhausting air in the coolant circulation loop, communicating the coolant circulation loop with the voltage stabilizer, and starting a main circulation pump to enable coolant to circularly flow in the loop;
(3) starting a spraying branch to spray into the voltage stabilizer, starting an electric heater of the voltage stabilizer to heat and boost a loop, and adjusting the loop to keep the pressure and temperature of the loop stable after the preset pressure and temperature are reached;
(4) opening a valve of the gas filling tank and a booster pump to supplement water to the gas filling tank, dissolving gas into a coolant circulation loop, measuring the dissolved concentration of the gas at the same time, and closing the valve of the gas filling tank and the booster pump after the dissolved concentration of the gas reaches a preset value;
(5) continuously opening a spraying branch, atomizing water dissolved with gas by a spray head, spraying the atomized water into a saturated steam space of the pressure stabilizer, exchanging quality and energy with the gas space, enabling the atomized water to fall into the saturated water in the pressure stabilizer, measuring the concentration of the non-condensable gas in a loop, closing the spraying branch, opening a steam exhaust branch valve, adjusting the flow to a preset value, continuously measuring the concentration of the gas phase in the pressure stabilizer in the process, adjusting the steam exhaust branch valve after the concentration of the gas phase in the pressure stabilizer reaches the preset value, adjusting the flow to a test working condition design value, simultaneously opening the spraying branch, adjusting the spraying flow to the working condition design value, adjusting the power of an electric heater of the pressure stabilizer to keep the pressure of the pressure stabilizer stable, operating a degassing process at the moment;
(6) keeping the pressure and temperature of the device stable, recording the change condition of the concentration of each measuring point along with time, recording the measurement data, and recording the pressure and the liquid level of the voltage stabilizer;
(7) and when the gas concentration of the loop reaches a preset lower limit, closing the spraying branch and the steam exhaust branch to finish a degassing test.
Further, the step (6) further comprises: and according to the liquid level change condition of the pressure stabilizer, supplementing the water amount lost by steam exhaust when the liquid level of the pressure stabilizer reaches the design lower limit.
Furthermore, according to the measuring speed of the measuring points, a group of measuring data is recorded every 5 min.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the invention designs a pressurized water reactor degassing test device and a thermal physical degassing process method under the condition of high temperature and high pressure by using the existing steam pressure stabilizer equipment as a degassing reactor according to the pressure, temperature and main equipment operation parameters of a primary loop of a reactor and the characteristics of low-concentration gas dissolved in a coolant, can be used for simulating the dynamic degassing process of the primary loop of the reactor from normal pressure to the operation pressure (15.5MPa) and the influence rule of various parameters such as pressure, temperature, spray flow, exhaust flow and the like, has the characteristics of small distortion degree and accurate simulation of the gas concentration change characteristic of the degassing process, and is suitable for providing data support and verification for a pressurized water reactor primary loop model and a design scheme in degassing engineering.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic diagram of the composition of the test apparatus of the present application.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring to fig. 1, an embodiment of the present invention provides a degassing testing apparatus, including:
the device comprises a coolant circulation loop, an exhaust branch, a spraying branch, an air-entrapping branch and a pressure stabilizing branch;
the coolant circulation circuit includes: the system comprises a main circulating pump, a coolant circulating pipeline and a heat exchange branch; the both ends of coolant circulation pipeline are connected with the play liquid end and the feed liquor end of main circulating pump respectively, and main circulating pump is used for making return circuit coolant at the pipeline inner loop flow, and the heat transfer branch road includes: one end of the heat exchange pipeline is communicated with the coolant circulation pipeline, the other end of the heat exchange pipeline is communicated with the coolant circulation pipeline after being connected with the heat exchanger, and the heat exchanger is used for maintaining the temperature of the loop coolant to be stable;
the voltage stabilizing branch includes: the system comprises a pressure stabilizer and a pressure stabilizing pipeline, wherein one end of the pressure stabilizing pipeline is communicated with a liquid outlet hole of the pressure stabilizer, the other end of the pressure stabilizing pipeline is communicated with a coolant circulating pipeline on the side of a liquid inlet end of a main circulating pump, the pressure stabilizer heats part of coolant into steam, compensates pressure reduction caused by spraying and steam exhaust, and transmits the coolant back to the coolant circulating pipeline through the pressure stabilizing pipeline;
one end of the exhaust branch extends into the steam space of the pressure stabilizer, and the exhaust branch is used for exhausting dissolved gas in the steam space of the pressure stabilizer;
the branch road sprays includes: one end of the spraying pipeline is communicated with a coolant circulating pipeline on the liquid outlet side of the main circulating pump, one end of the spraying pipeline is connected with the atomizing nozzle positioned at the top in the pressure stabilizer, and the spraying branch is used for spraying loop coolant into a pressure stabilizer steam space;
the gas filling branch comprises: the system comprises a gas adding tank and a gas adding pipeline, wherein one end of the gas adding pipeline is communicated with the gas adding tank, and the other end of the gas adding pipeline is communicated with a coolant circulating pipeline on the liquid inlet side of a main circulating pump;
the pipeline of the device is provided with a plurality of measuring points for sampling and measuring the concentration of the dissolved gas at each position of the loop in real time.
The device in this embodiment is a test device with dynamic degassing characteristics consistent with those of a prototype and a certain simulation proportion of scale to the prototype, and comprises: (1) a pressure pipeline system for accommodating the coolant for circulating operation and a steam type pressure stabilizer for keeping the pressure stable; (2) the pressure stabilizer in the step (1) is provided with an atomizing and spraying device with adjustable flow, an electric heating device with adjustable built-in electric power and an exhaust device; (2) 4 sampling measuring points are arranged in a loop of the testing device, and the dissolved gas concentrations at different positions of the loop are measured in real time; (3) the gas adding tank with the atomizing spray device adds the coolant with the saturated dissolved gas concentration with the preset concentration into the loop by controlling the flow rate flowing into the loop and ensures that the dissolved gas cannot be separated out.
The degassing principle of the apparatus in this embodiment, according to modeling criteria, includes: parameters such as the type of the removed gas, the pressure of the pressure stabilizer, the temperature of the spraying liquid, the ratio between the total mass of the loop and the spraying flow, the ratio between the steam exhaust flow and the spraying flow and the like are kept consistent with the prototype, the dynamic degassing process of the loop of the nuclear reactor is simulated by combining the thermal physical degassing process flow of the pressure stabilizer designed by the test device, and the degassing efficiency under the design parameters is obtained by the formula (2), and the influence of the parameters on the degassing efficiency is researched by changing the parameters. In the degassing dynamic characteristic of the voltage stabilizer, the change of the concentration of the dissolved gas in the loop along with time is expressed as:
C
1＝C
0exp(-G
1ετ/W) (2)
wherein, C
1Is the loop dissolved gas concentration, C
0Is the initial state gas concentration, G
1Is the spray rate, kg/h,. epsilon.is the degassing efficiency,. tau.is the time,. h, W total mass of coolant in the circuit, kg.
The test device and the thermal physical degassing process method in the embodiment can be used for carrying out degassing test research on gases such as krypton, argon, hydrogen, helium and the like.
FIG. 1 is a schematic diagram of a degassing simulation test apparatus. 1 is a main circulating pump, and after starting, the loop coolant circularly flows in the pipeline; 2, a heat exchanger is used for keeping the temperature of the loop coolant stable after being started; 3, a steam exhaust branch for exhausting high-concentration dissolved gas in the steam space of the pressure stabilizer; 4, a spraying branch, which sprays the loop coolant into the pressure stabilizer steam space; the pressure stabilizer is used as a degassing device and a loop pressure stabilizing device, an atomizing nozzle is arranged at the top of the pressure stabilizer, the fluid of the spraying branch enters the pressure stabilizer, is atomized by the atomizing nozzle and then is sprayed into a steam space of the pressure stabilizer to exchange quality and energy with steam, an electric heater is arranged at the lower part of the pressure stabilizer, and after the pressure stabilizer is started, part of the coolant is heated into steam to compensate pressure reduction caused by spraying and steam exhaust; and 6, a gas filling tank, and gas with preset concentration can be added into the loop. The four measuring points a-d can sample and measure the concentration of the dissolved gas at each position of the loop in real time.
The thermal physical process method for degassing by adopting a degassing simulation test device comprises the following steps:
(1) the gas adding tank 6 is firstly isolated from a loop, water is filled, dissolved gas (krypton, argon, hydrogen or helium) is filled after the gas bottle is connected, water is drained at the same time, after the liquid level in the gas adding tank 6 reaches the lowest point, the drain valve is closed, the gas is continuously filled to half of the running pressure of the loop, the booster pump is started, high-pressure water is atomized by the atomizing nozzle and then is sprayed into the gas adding tank 6 to fill the gas adding tank, the dissolved gas with saturated concentration is dissolved in the water in the gas adding tank 6, the booster pump is closed after the pressure in the gas adding tank 6 is increased to the running pressure of the loop, and at the moment, the gas to be removed with saturated concentration under corresponding pressure is;
(2) starting a voltage stabilizer 5 to boost pressure, filling the loop system with deionized water, exhausting gas, communicating the voltage stabilizer, and starting a main circulating pump 1 to enable the coolant to circularly flow in the loop;
(3) starting the spraying branch 4 to spray into the voltage stabilizer, starting the electric heater of the voltage stabilizer to heat and boost the loop, and adjusting the loop to keep the pressure and temperature of the loop stable after the preset pressure and temperature are reached;
(4) opening a valve of the gas adding tank 6 and a booster pump to supplement water to the gas adding tank, dissolving gas into the loop system, measuring the dissolved concentration of the gas at the same time, and closing the valve of the gas adding tank 6 and the booster pump after the dissolved concentration of the gas reaches a preset value;
(5) continuing to open the spraying branch 4, atomizing water dissolved with gas by a spray head, spraying the atomized water into a saturated steam space of the pressure stabilizer, exchanging quality and energy with the gas space, falling into the saturated water in the pressure stabilizer, measuring the concentration of the non-condensable gas in the loop, closing the spraying branch, opening a valve of the steam exhaust branch 3, adjusting the flow to a preset value, continuously measuring the concentration of the gas phase of the pressure stabilizer 5 in the process, adjusting the valve of the steam exhaust branch 3 after the concentration of the gas phase reaches the preset value, adjusting the flow to a test working condition design value, simultaneously opening the spraying branch 4, adjusting the spraying flow to the working condition design value, adjusting the power of an electric heater of the pressure stabilizer to keep the pressure of the pressure stabilizer stable, operating the degassing process at the moment, and starting a;
(6) in the process, the pressure and the temperature of the system are kept stable, meanwhile, the change situation of the concentration of each measuring point along with time is recorded, a group of data is recorded every 5min according to the measuring speed of the four measuring points from a to d, the pressure and the liquid level of the voltage stabilizer 5 are recorded, the water quantity lost by steam exhaust is supplemented when the liquid level of the voltage stabilizer 5 reaches the design lower limit according to the change situation of the liquid level of the voltage stabilizer, and the influence on the system parameters is reduced as much as possible in the water supplementing process;
(7) when the gas concentration of the loop reaches a preset lower limit, the spraying branch 4 and the steam exhaust branch 3 are closed, and a degassing test is completed.
The dynamic characteristics of the prototype degassing process can be simulated according to the test parameters determined by the simulation proportion of the test device and the modeling criterion.
In the process flow of each test, the influence rule of each parameter on the degassing efficiency can be researched by repeating the process methods from (1) to (7) through changing each parameter such as the type and concentration of the degassing dissolved gas, the spray flow, the exhaust flow, the loop pressure, the loop temperature, the atomization effect of the atomization nozzle and the like.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A degassing testing apparatus, the apparatus comprising:
the device comprises a coolant circulation loop, an exhaust branch, a spraying branch, an air-entrapping branch and a pressure stabilizing branch;
the coolant circulation circuit includes: the system comprises a main circulating pump, a coolant circulating pipeline and a heat exchange branch; the both ends of coolant circulation pipeline are connected with the play liquid end and the feed liquor end of main circulating pump respectively, and main circulating pump is used for making return circuit coolant at the pipeline inner loop flow, and the heat transfer branch road includes: one end of the heat exchange pipeline is communicated with the coolant circulation pipeline, the other end of the heat exchange pipeline is communicated with the coolant circulation pipeline after being connected with the heat exchanger, and the heat exchanger is used for maintaining the temperature of the loop coolant to be stable;
the voltage stabilizing branch includes: the system comprises a pressure stabilizer and a pressure stabilizing pipeline, wherein one end of the pressure stabilizing pipeline is communicated with a liquid outlet hole of the pressure stabilizer, the other end of the pressure stabilizing pipeline is communicated with a coolant circulating pipeline on the side of a liquid inlet end of a main circulating pump, the pressure stabilizer heats part of coolant into steam, compensates pressure reduction caused by spraying and steam exhaust, and transmits the coolant back to the coolant circulating pipeline through the pressure stabilizing pipeline;
one end of the exhaust branch extends into the steam space of the pressure stabilizer, and the exhaust branch is used for exhausting dissolved gas in the steam space of the pressure stabilizer;
the branch road sprays includes: one end of the spraying pipeline is communicated with a coolant circulating pipeline on the liquid outlet side of the main circulating pump, one end of the spraying pipeline is connected with the atomizing nozzle positioned at the top in the pressure stabilizer, and the spraying branch is used for spraying loop coolant into a pressure stabilizer steam space;
the gas filling branch comprises: the system comprises a gas adding tank and a gas adding pipeline, wherein one end of the gas adding pipeline is communicated with the gas adding tank, and the other end of the gas adding pipeline is communicated with a coolant circulating pipeline on the liquid inlet side of a main circulating pump;
the pipeline of the device is provided with a plurality of measuring points for sampling and measuring the concentration of the dissolved gas at each position of the loop in real time.
2. The degassing test apparatus according to claim 1, wherein the pipeline of the apparatus is provided with 4 measuring points, which are respectively a measuring point a, a measuring point b, a measuring point c and a measuring point d, the measuring point a is positioned on the spray pipeline, the measuring point b is positioned on the exhaust branch pipeline, the measuring point c is positioned on the pressure stabilizing pipeline, and the measuring point d is positioned on the coolant circulation pipeline at the side of the liquid inlet end of the main circulation pump.
3. A degassing test apparatus according to claim 1, wherein the exhaust branch is provided with a first flow meter and a first electrically-operated regulating valve.
4. A degassing test apparatus as claimed in claim 1, wherein a second flow meter and a second electric control valve are installed on the spray branch.
5. The degassing test apparatus according to claim 1, wherein a stop valve is installed on the gas supply pipeline.
6. The degassing test apparatus according to claim 1, wherein the coolant circulation pipeline is provided with: the heat exchange branch is connected with two ends of the fourth electric regulating valve in parallel, and the flow meter and the fifth electric regulating valve are installed on the heat exchange branch.
7. The degassing test apparatus according to claim 1, wherein an electric heater is installed at the bottom of the pressurizer, and the electric heater is used for heating part of the coolant into steam.
8. A method of testing outgassing based on the outgassing testing apparatus of any of claims 1-7, wherein the method comprises:
(1) the gas adding tank is isolated from the loop, the gas filling tank is connected with the gas cylinder after being filled with water, water is discharged while the gas filling tank is filled with dissolved gas, after the liquid level in the gas filling tank reaches the lowest point, the water discharge valve is closed, the gas is continuously filled to half of the operating pressure of the loop, the booster pump is started, high-pressure water is atomized by the atomizing nozzle and then is sprayed into the gas adding tank to fill the gas filling tank, the dissolved gas with saturated concentration is dissolved in the water in the gas filling tank, the booster pump is closed after the pressure in the gas filling tank is increased to the operating pressure of the loop, and at the moment, the gas to be removed with;
(2) starting a voltage stabilizer to boost pressure, filling deionized water in a coolant circulation loop, exhausting air in the coolant circulation loop, communicating the coolant circulation loop with the voltage stabilizer, and starting a main circulation pump to enable coolant to circularly flow in the loop;
(3) starting a spraying branch to spray into the voltage stabilizer, starting an electric heater of the voltage stabilizer to heat and boost a loop, and adjusting the loop to keep the pressure and temperature of the loop stable after the preset pressure and temperature are reached;
(4) opening a valve of the gas filling tank and a booster pump to supplement water to the gas filling tank, dissolving gas into a coolant circulation loop, measuring the dissolved concentration of the gas at the same time, and closing the valve of the gas filling tank and the booster pump after the dissolved concentration of the gas reaches a preset value;
(5) continuously opening a spraying branch, atomizing water dissolved with gas by a spray head, spraying the atomized water into a saturated steam space of the pressure stabilizer, exchanging quality and energy with the gas space, enabling the atomized water to fall into the saturated water in the pressure stabilizer, measuring the concentration of the non-condensable gas in a loop, closing the spraying branch, opening a steam exhaust branch valve, adjusting the flow to a preset value, continuously measuring the concentration of the gas phase in the pressure stabilizer in the process, adjusting the steam exhaust branch valve after the concentration of the gas phase in the pressure stabilizer reaches the preset value, adjusting the flow to a test working condition design value, simultaneously opening the spraying branch, adjusting the spraying flow to the working condition design value, adjusting the power of an electric heater of the pressure stabilizer to keep the pressure of the pressure stabilizer stable, operating a degassing process at the moment;
(6) keeping the pressure and temperature of the device stable, recording the change condition of the concentration of each measuring point along with time, recording the measurement data, and recording the pressure and the liquid level of the voltage stabilizer;
(7) and when the gas concentration of the loop reaches a preset lower limit, closing the spraying branch and the steam exhaust branch to finish a degassing test.
9. The outgassing test method of claim 8, wherein the step (6) further comprises: and according to the liquid level change condition of the pressure stabilizer, supplementing the water amount lost by steam exhaust when the liquid level of the pressure stabilizer reaches the design lower limit.
10. A method of degassing testing according to claim 8 wherein a set of measurement data is recorded every 5min, depending on the speed of the point measurement.
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| CN113436767A (en) * | 2021-04-21 | 2021-09-24 | 广东核电合营有限公司 | Nuclear reactor primary circuit hydrogen control system and method |
| CN113782236A (en) * | 2021-09-09 | 2021-12-10 | 哈尔滨工程大学 | Test device for researching rapid start of nuclear reactor |
| CN114023471A (en) * | 2021-10-28 | 2022-02-08 | 苏州热工研究院有限公司 | Pressurized water reactor nuclear power station simulation experiment bench |
| CN115171928A (en) * | 2022-07-13 | 2022-10-11 | 西安交通大学 | Experiment bench capable of adjusting temperature and pressure of coolant and ion concentration |
| CN115831403A (en) * | 2023-01-01 | 2023-03-21 | 南通曙光机电工程有限公司 | Cooling spray protection device for nuclear power station voltage stabilizer |
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