CN108766601B - Experimental device and experimental method suitable for multi-working-medium liquid-phase entrainment research - Google Patents
Experimental device and experimental method suitable for multi-working-medium liquid-phase entrainment research Download PDFInfo
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- CN108766601B CN108766601B CN201810511336.2A CN201810511336A CN108766601B CN 108766601 B CN108766601 B CN 108766601B CN 201810511336 A CN201810511336 A CN 201810511336A CN 108766601 B CN108766601 B CN 108766601B
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- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
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- G21C—NUCLEAR REACTORS
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an experimental device and an experimental method suitable for multi-working medium liquid phase entrainment research, which comprise a T-shaped pipe experimental section, a weighing water tank, a weighing platform, a centrifugal pump, working medium containers, a fan and related pipelines, wherein the T-shaped pipe experimental section comprises a horizontal main pipe section and a vertical branch pipe section, a working medium channel and an induced air channel are respectively connected with a liquid phase inlet and a gas phase inlet of the main pipe section, a guide plate is arranged at an outlet of the branch pipe section, the branch pipe section is connected with the weighing water tank, a baffle plate is arranged in the weighing water tank, the weighing water tank is arranged on the weighing platform, and the outlet of the main pipe section is respectively. The experimental device can provide service for the research of the initial point and the steady-state entrainment process of the liquid-phase entrainment in the T-shaped pipe, has the function of quickly switching experimental working media, and can perform liquid-phase entrainment experiments of various different working media. In addition, a method combining air purging and two-phase flushing is adopted in the experimental method, so that flushing working media consumed during switching of the experimental working media are effectively saved.
Description
Technical Field
The invention relates to an experimental device and an experimental method suitable for multi-working-medium liquid-phase entrainment research, and belongs to the field of two-phase flow experimental design.
Background
A T-shaped structure is very common in a nuclear power System, and a connecting pipe between a pipeline of a Fourth-level Automatic decompression System (ADS-4) and a Passive Residual Heat Removal System (PRHRS) in an AP1000 of a third-generation nuclear power plant and a main pipeline is a typical T-shaped structure. The phenomenon of liquid phase entrainment can occur at the T-shaped structure under the loss of coolant accident of a nuclear power plant, and the water loading of the reactor core is directly reduced, so that the safety of the reactor core of the reactor is influenced. Aiming at the dangerous situation, deep research needs to be carried out by building an experimental simulation device, and a corresponding data model is built, so that reference is provided for design and safety analysis of a nuclear power plant.
Patent 201610224707.X discloses a T-shaped tube entrainment test system and method based on a 4 th-level automatic depressurization system of a nuclear power plant reactor, the device can carry out an entrainment test with steam/water as a working medium, and reflects the situation in the reactor, but the device is difficult to carry out a comparison experiment on the situations of various working mediums. The solution that the person in the art easily thinks of is that directly add a return circuit more and carry out the switching of many working mediums, and carry out the contrast experiment, but if lack the cleaning function to pipeline inside residual working medium, can make the experiment mix impurity and lead to the too big problem of experimental result deviation. Therefore, an experimental device and an experimental method which can research the entrainment characteristic of the T-shaped pipe, can easily switch the working medium, can recycle the working medium and can well solve the problem of residual working medium need to be designed.
Disclosure of Invention
The invention aims to provide an experimental device and an experimental method suitable for multi-working-medium liquid-phase entrainment research aiming at the liquid-phase entrainment characteristic in a T-shaped pipe of a reactor system of a nuclear power plant, and the experimental device and the experimental method can be applied to the research of an initial point and a steady-state entrainment process of the T-shaped pipe.
The purpose of the invention is realized as follows: the device comprises a T-shaped experimental section, a weighing platform, a weighing water tank arranged on the weighing platform, a working medium container A, a working medium container B, a working medium container C and a fan, wherein the T-shaped experimental section comprises a horizontal main pipe section and a vertical branch pipe section, the working medium container A is sequentially connected with a first centrifugal pump, a first ball valve, a first flow meter and a sixth ball valve, the working medium container B is sequentially connected with a second centrifugal pump, a third ball valve, a second flow meter and a fifth ball valve, the fifth ball valve and the sixth ball valve are all communicated with an inlet below the main pipe section, the fan is sequentially connected with a tenth ball valve and a third flow meter, the third flow meter is communicated with an inlet above the main pipe section through a pipeline, an outlet of the main pipe section is respectively communicated with the working medium container A, the working medium container B and the working medium container C through an eighth ball valve, a seventh ball valve and a ninth ball valve, thermocouples and pressure sensors are arranged on the pipelines of the outlets of, the weighing water tank is internally provided with a baffle plate, the upper end of the branch pipe section extends into the weighing water tank, and the upper end part of the branch pipe section is provided with a guide plate.
The invention also includes such structural features:
1. an eleventh ball valve is connected in parallel on a pipeline between the fan and the tenth ball valve, the end part of the eleventh ball valve is communicated with the atmosphere, a second ball valve is connected in parallel on a pipeline between the first centrifugal pump and the first ball valve, the second ball valve is communicated with the working medium container A through a pipeline, a fourth ball valve is connected in parallel on a pipeline between the second centrifugal pump and the third ball valve, the fourth ball valve is communicated with the working medium container B through a pipeline, the working medium container A, the first centrifugal pump, the first ball valve and the second ball valve used for adjusting the flow rate form a first working medium channel, the working medium container B, the second centrifugal pump, the third ball valve and the fourth ball valve used for adjusting the flow rate form a second working medium channel, and the fan, the tenth ball valve and the eleventh ball valve form an induced air channel.
2. An experimental method suitable for multi-working-medium liquid-phase entrainment research comprises the following steps:
the first step is as follows: firstly, performing a liquid phase entrainment experiment of a working medium A in a working medium container A, opening a first ball valve, a second ball valve, a sixth ball valve and an eighth ball valve, closing a third ball valve, a fourth ball valve, a fifth ball valve, a seventh ball valve and a ninth ball valve, starting a first centrifugal pump, and adjusting the opening degrees of the first ball valve and the second ball valve to enable a first working medium channel to reach an initial liquid phase flow;
the second step is that: opening the tenth ball valve and the eleventh ball valve, starting the fan, and adjusting the opening degrees of the tenth ball valve and the eleventh ball valve to enable the induced air channel to reach the initial gas phase flow;
the third step: the liquid level of the main pipe section is controlled by adjusting the eighth ball valve, and an entrainment starting point is found;
the fourth step: continuously increasing the liquid level of the main pipe section, carrying out steady-state entrainment research under different air cavity heights, collecting the entrainment quantity of the branch pipes under the conditions of different air cavity heights, and carrying out weighing measurement;
the fifth step: changing the flow of the liquid phase and the flow of the gas phase, repeating the step 3-4, and researching an entrainment starting point and a steady-state entrainment process under different liquid phase and gas phase flows;
and a sixth step: after the entrainment experiment of the working medium A is finished, stopping the first centrifugal pump, closing the sixth ball valve and the eighth ball valve, opening the ninth ball valve, and performing air purging and two-phase flushing operation on the loop at the moment; adjusting a tenth ball valve and an eleventh ball valve, increasing the gas phase flow, and purging most of residual liquid in the loop into the working medium container C; keeping the fan running, opening the third ball valve, the fourth ball valve and the fifth ball valve, starting the second centrifugal pump, continuously flushing the loop by using two-phase flow formed by the working medium B and air in the working medium container B, adjusting the third ball valve, the fourth ball valve, the tenth ball valve and the eleventh ball valve to form bubble flow or annular flow in the experimental section, and finally enabling flushing liquid to flow into the working medium container C;
the seventh step: opening a seventh ball valve, closing a ninth ball valve, adjusting the opening degrees of the third ball valve and the fourth ball valve to enable the second working medium channel to reach the initial liquid phase flow, adjusting the opening degrees of a tenth ball valve and an eleventh ball valve to enable the induced air channel to reach the initial gas phase flow, then repeating the steps 3-5, carrying out the entrainment experiment of the working medium B, and controlling the liquid level of the main pipe section by adjusting the seventh ball valve.
Compared with the prior art, the invention has the beneficial effects that: the experimental device can provide service for the research of the initial point and the steady-state entrainment process of the liquid-phase entrainment in the T-shaped pipe, has the function of quickly switching experimental working media, and can perform liquid-phase entrainment experiments of various working media. In addition, a method combining air purging and two-phase flushing is adopted in the experimental method, so that flushing working media consumed during switching of the experimental working media are effectively saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: the device comprises a working medium container A, a working medium container B, a fourth ball valve, a second centrifugal pump, a third ball valve, a third flow meter, a weighing platform, a weighing water tank, a baffle plate, a guide plate, a third flow meter, a tenth ball valve, an eleventh ball valve, a fan, a fifth ball valve, a sixth ball valve, a first flow meter, a first ball valve, a first centrifugal pump, a second centrifugal pump and a second centrifugal pump, wherein the working medium container A is 1, the working medium container B is 2, the fourth ball valve is 3, the eighth ball valve is 9, the ninth ball valve is 10, the T-shaped pipe experimental section is 11, the weighing platform is 12, the weighing water tank is 13, the baffle plate is 14, the guide plate is 15, the third.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The purpose of the invention is realized as follows: the device comprises a T-shaped pipe experimental section, a weighing water tank, a weighing platform, a centrifugal pump, a working medium container, a fan and related pipelines; the experimental device is provided with two working medium channels which are connected in parallel, each working medium channel comprises a working medium container, a centrifugal pump connected with the working medium container and a ball valve used for adjusting flow, and a ball valve is also arranged on a bypass of the centrifugal pump; the induced air channel comprises a fan and a ball valve for adjusting air flow; the T-shaped pipe experimental section comprises a horizontal main pipe section and a vertical branch pipe section, and the working medium channel and the induced air channel are respectively connected with a liquid phase inlet and a gas phase inlet of the main pipe section; a guide plate is arranged at the outlet of a branch pipe section of the T-shaped pipe experiment section, and the branch pipe section is connected with a weighing water tank; the baffle plate is arranged in the weighing water tank, and the weighing water tank is arranged on the weighing platform; the outlet of the main pipe section is respectively connected with the three working medium containers; the working medium channel and the induced draft channel are respectively provided with a mass flowmeter, and a thermocouple and a pressure sensor are arranged on an outlet pipeline of the mass flowmeter.
The experimental method comprises the following steps: starting a centrifugal pump to enable working media in one working medium channel to start to circularly flow, adjusting the flow of a liquid phase to an initial value, starting a fan to send air into a T-shaped pipe experiment section, adjusting the flow of a gas phase to the initial value, increasing the liquid level of a main pipe section from the minimum value, performing an initial entrainment point and steady state entrainment process experiment, and performing entrainment experiments under different liquid phase and gas phase flows; purging and flushing an experimental loop before switching another experimental working medium, and then carrying out an entrainment characteristic experiment of another working medium by using another working medium channel.
As shown in figure 1, the invention comprises a T-shaped pipe experimental section, a weighing water tank, a weighing platform, a centrifugal pump, a working medium container, a fan and related pipelines.
The experimental device is provided with two working medium channels which are connected in parallel, wherein the first working medium channel comprises a working medium container A1, a first centrifugal pump 24 connected with the working medium container A1, a first ball valve 23 and a second ball valve 25 for adjusting flow; the second working medium channel comprises a working medium container B2, a second centrifugal pump 4 connected with the working medium container B2, a third ball valve 5 and a fourth ball valve 3 for adjusting flow. The induced air passage includes a fan 19 and tenth and eleventh ball valves 17 and 18 for adjusting the flow rate of air. The two working medium channels and the induced draft channel are respectively provided with a first flowmeter 22, a second flowmeter 6 and a third flowmeter 16, and the outlet pipelines of the flowmeters are provided with thermocouples and pressure sensors.
The T-shaped pipe experiment section 11 comprises a horizontal main pipe section and a vertical branch pipe section, liquid phase fluid and gas phase fluid respectively enter the main pipe section through a working medium channel and an induced air channel, an entrainment phenomenon is formed at the joint of the main pipe section and the branch pipe section after the two-phase fluid enters the experiment section, and liquid drops are entrained by the gas phase and enter the weighing water tank 13. The droplets are separated by the baffle 14 and fall back to the bottom of the tank and are weighed by the weighing platform 12 to obtain the entrained mass. A guide plate 15 is arranged at the outlet of the branch pipe section, the structure ensures that no mechanical connection exists between the branch pipe section and the weighing water tank 13, and liquid is guided to flow to the bottom of the water tank, so that the weighing is convenient. In the experiment, liquid phase fluid can flow back to the working medium container A1 or the working medium container B2 through a corresponding pipeline after flowing out of the main pipe section, so that a complete loop is formed; when the working medium is switched, the flushing working medium flows out of the main pipe section and then flows into the working medium container C7 along the pipeline.
The first ball valve 23 and the sixth ball valve 21 are located between the first centrifugal pump 24 and the inlet of the main pipe section, the second ball valve 25 is located on the parallel pipeline of the first centrifugal pump 24, the third ball valve 5 and the fifth ball valve 20 are located between the second centrifugal pump 4 and the inlet of the main pipe section, the fourth ball valve 3 is located on the parallel pipeline of the second centrifugal pump 4, the tenth ball valve 17 is located between the fan 19 and the inlet of the main pipe section, the eleventh ball valve 18 is located on the parallel bypass of the fan 19, and the seventh ball valve 8, the eighth ball valve 9 and the ninth ball valve 10 are respectively located between the outlet of the main pipe section and the working medium container B2, the working medium container A1 and the working medium container C7.
The specific experimental method for carrying out the liquid phase entrainment experiment in the T-shaped pipe by using the experimental device is as follows:
1. firstly, performing a liquid phase entrainment experiment of a working medium A in a working medium container A1, opening a first ball valve 23, a second ball valve 25, a sixth ball valve 21 and an eighth ball valve 9, closing a third ball valve 5, a fourth ball valve 3, a fifth ball valve 20, a seventh ball valve 8 and a ninth ball valve 10, starting a first centrifugal pump 24, and adjusting the opening degrees of the first ball valve 23 and the second ball valve 25 to enable a first working medium channel to reach an initial liquid phase flow.
2. And opening the tenth ball valve 17 and the eleventh ball valve 18, starting the fan 19, and adjusting the opening degree of the tenth ball valve 17 and the eleventh ball valve 18 to enable the induced air channel to reach the initial gas phase flow.
3. And the liquid level of the main pipe section is controlled by adjusting the eighth ball valve 9, so that an entrainment starting point is found.
4. And continuously increasing the liquid level of the main pipe section, carrying out steady-state entrainment research under different air cavity heights, collecting the entrainment quantity of the branch pipes under the conditions of different air cavity heights, and weighing and measuring.
5. Changing the flow of the liquid phase and the flow of the gas phase, repeating the step 3-4, and researching an entrainment starting point and a steady-state entrainment process under different liquid phase and gas phase flows.
6. And (3) stopping the first centrifugal pump 24 after the entrainment experiment of the working medium A is finished, closing the sixth ball valve 21 and the eighth ball valve 9, and opening the ninth ball valve 10, and performing air purging and two-phase flushing operation on the loop at the moment. Adjusting a tenth ball valve 17 and an eleventh ball valve 18, increasing the gas phase flow, and purging most of residual liquid in the loop into a working medium container C7; keeping the fan 19 running, opening the third ball valve 5, the fourth ball valve 3 and the fifth ball valve 20, starting the second centrifugal pump 4, continuously flushing the loop by using two-phase flow formed by the working medium B in the working medium container B2 and air, and adjusting the third ball valve 5, the fourth ball valve 3, the tenth ball valve 17 and the eleventh ball valve 18 to form bubble flow or annular flow in the experimental section, wherein the bubble flow or the annular flow has a strong stirring effect, so that the flushing efficiency is high, the flushing working medium can be effectively saved, and the flushing liquid finally flows into the working medium container C7.
7. Opening a seventh ball valve 8, closing a ninth ball valve 10, adjusting the opening degrees of the third ball valve 5 and the fourth ball valve 3 to enable the second working medium channel to reach the initial liquid phase flow, adjusting the opening degrees of a tenth ball valve 17 and an eleventh ball valve 18 to enable the induced air channel to reach the initial gas phase flow, then repeating the steps 3-5 to carry out the entrainment experiment of the working medium B, and paying attention to the fact that the liquid level of the main pipe section is controlled by adjusting the seventh ball valve 8 at the moment.
8. And replacing the original working media in the working medium container A1 and the working medium container B2 with other types of working media, and continuing the liquid phase entrainment experiment of other types of working media by adopting the air purging and two-phase flushing method in the step 6.
The invention relates to an experimental device and an experimental method suitable for multi-working medium liquid phase entrainment research, which are characterized in that: the device comprises a T-shaped pipe experimental section, a weighing water tank, a weighing platform, a centrifugal pump, a working medium container, a fan and related pipelines, and adopts two working medium channels connected in parallel and an air inducing channel. T type pipe experiment section is responsible for the section and vertical branch pipe section including the horizontally, working medium passageway and induced air passageway respectively with be responsible for the liquid phase entry and the gaseous phase entry linkage of section, and branch pipe section export is equipped with the guide plate, and branch pipe section is connected with the water tank of weighing, and the baffling board is installed inside the water tank of weighing, and the water tank of weighing is arranged in on the weighing platform, and the export of being responsible for the section is connected respectively with three working medium container. During the experiment, an entrainment experiment of one working medium is firstly carried out, an experiment loop is swept and washed before another experiment working medium is switched, and then an entrainment characteristic experiment of another working medium is carried out by using another working medium channel. The experimental device can provide service for the research of the initial point and the steady-state entrainment process of the liquid-phase entrainment in the T-shaped pipe, has the function of quickly switching experimental working media, and can perform liquid-phase entrainment experiments of various working media. In addition, a method combining air purging and two-phase flushing is adopted in the experimental method, so that flushing working media consumed during switching of the experimental working media are effectively saved.
Claims (2)
1. The utility model provides an experimental apparatus suitable for research is smugglied secretly to many working mediums liquid phase which characterized in that: the device comprises a T-shaped pipe experimental section, a weighing platform, a weighing water tank arranged on the weighing platform, a working medium container A, a working medium container B, a working medium container C and a fan, wherein the T-shaped pipe experimental section comprises a horizontal main pipe section and a vertical branch pipe section, the working medium container A is sequentially connected with a first centrifugal pump, a first ball valve, a first flow meter and a sixth ball valve, the working medium container B is sequentially connected with a second centrifugal pump, a third ball valve, a second flow meter and a fifth ball valve, the fifth ball valve and the sixth ball valve are all communicated with an inlet below the main pipe section, the fan is sequentially connected with a tenth ball valve and a third flow meter, the third flow meter is communicated with an inlet above the main pipe section through a pipeline, an outlet of the main pipe section is respectively communicated with the working medium container A, the working medium container B and the working medium container C through an eighth ball valve, a seventh ball valve and a ninth ball valve, thermocouples and pressure sensors are arranged on the pipelines of the, a baffle plate is arranged in the weighing water tank, the upper end of the branch pipe section extends into the weighing water tank, and a guide plate is arranged at the upper end part of the branch pipe section; an eleventh ball valve is connected in parallel on a pipeline between the fan and the tenth ball valve, the end part of the eleventh ball valve is communicated with the atmosphere, a second ball valve is connected in parallel on a pipeline between the first centrifugal pump and the first ball valve, the second ball valve is communicated with the working medium container A through a pipeline, a fourth ball valve is connected in parallel on a pipeline between the second centrifugal pump and the third ball valve, the fourth ball valve is communicated with the working medium container B through a pipeline, the working medium container A, the first centrifugal pump, the first ball valve and the second ball valve used for adjusting the flow rate form a first working medium channel, the working medium container B, the second centrifugal pump, the third ball valve and the fourth ball valve used for adjusting the flow rate form a second working medium channel, and the fan, the tenth ball valve and the eleventh ball valve form an induced air channel; two working medium channels and an induced air channel which are connected in parallel are formed, an entrainment experiment of one working medium is firstly carried out during the experiment, an experiment loop is swept and washed before another experiment working medium is switched, and then an entrainment characteristic experiment of another working medium is carried out by using the other working medium channel.
2. An experimental method suitable for multi-working medium liquid phase entrainment research is characterized in that: comprising the experimental set-up of claim 1, the steps of:
the first step is as follows: firstly, performing a liquid phase entrainment experiment of a working medium A in a working medium container A, opening a first ball valve, a second ball valve, a sixth ball valve and an eighth ball valve, closing a third ball valve, a fourth ball valve, a fifth ball valve, a seventh ball valve and a ninth ball valve, starting a first centrifugal pump, and adjusting the opening degrees of the first ball valve and the second ball valve to enable a first working medium channel to reach an initial liquid phase flow;
the second step is that: opening the tenth ball valve and the eleventh ball valve, starting the fan, and adjusting the opening degrees of the tenth ball valve and the eleventh ball valve to enable the induced air channel to reach the initial gas phase flow;
the third step: the liquid level of the main pipe section is controlled by adjusting the eighth ball valve, and an entrainment starting point is found;
the fourth step: continuously increasing the liquid level of the main pipe section, carrying out steady-state entrainment research under different air cavity heights, collecting the entrainment quantity of the branch pipes under the conditions of different air cavity heights, and carrying out weighing measurement;
the fifth step: changing the flow of the liquid phase and the flow of the gas phase, repeating the step 3-4, and researching an entrainment starting point and a steady-state entrainment process under different liquid phase and gas phase flows;
and a sixth step: after the entrainment experiment of the working medium A is finished, stopping the first centrifugal pump, closing the sixth ball valve and the eighth ball valve, opening the ninth ball valve, and performing air purging and two-phase flushing operation on the loop at the moment; adjusting a tenth ball valve and an eleventh ball valve, increasing the gas phase flow, and purging most of residual liquid in the loop into the working medium container C; keeping the fan running, opening the third ball valve, the fourth ball valve and the fifth ball valve, starting the second centrifugal pump, continuously flushing the loop by using two-phase flow formed by the working medium B and air in the working medium container B, adjusting the third ball valve, the fourth ball valve, the tenth ball valve and the eleventh ball valve to form bubble flow or annular flow in the experimental section, and finally enabling flushing liquid to flow into the working medium container C;
the seventh step: opening a seventh ball valve, closing a ninth ball valve, adjusting the opening degrees of the third ball valve and the fourth ball valve to enable the second working medium channel to reach the initial liquid phase flow, adjusting the opening degrees of a tenth ball valve and an eleventh ball valve to enable the induced air channel to reach the initial gas phase flow, then repeating the steps 3-5, carrying out the entrainment experiment of the working medium B, and controlling the liquid level of the main pipe section by adjusting the seventh ball valve.
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