CN112096622B - High-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system and method - Google Patents
High-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system and method Download PDFInfo
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Abstract
The invention discloses a thermal hydraulic performance and corrosion rate measuring experimental system and method for a high-temperature lead-bismuth pump. The argon control loop comprises an argon bottle, an argon buffer tank, 4 regulating valves and corresponding pipelines; the experiment test loop contains the heating section, lead bismuth-argon gas expansion tank, new-type high temperature lead bismuth pump, the motor, the electromagnetic flowmeter, lead bismuth storage tank, the heater, 5 pressure measurement device, 5 temperature measurement device, 1 electromagnetic surface relative velocity of flow measuring device, 1 electromagnetic flowmeter, 2 governing valves and corresponding pipeline. The system is suitable for running in a high-temperature environment, has good sealing performance and outstanding safety performance, and can measure and research the thermal hydraulic performance and the corrosion rate of the lead-bismuth pump under different pressure and temperature conditions by adjusting an argon control loop and observing the disassembly of the novel high-temperature lead-bismuth pump.
Description
Technical Field
The invention belongs to the field of engineering thermophysics and energy utilization disciplines, and particularly relates to a novel high-temperature lead bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system and an experiment method thereof.
Background
According to the latest technical report of the four-generation reactor released in 2014 by the international atomic energy agency, the lead-cooled fast reactor (LFR) is expected to realize industrial demonstration and commercial application at first and becomes the development representative direction of the four-generation nuclear reactor system. The lead-bismuth pump is used as a key device of a primary circuit of the lead-bismuth cooling fast reactor, and the operation stability is related to the safety of reactor core thermophysics. Therefore, the method has very important significance for testing and researching the thermal hydraulic performance and the corrosion rate of the lead-bismuth pump.
In order to safely construct and operate a reactor lead-bismuth loop, a simpler and more efficient lead-bismuth pump is designed, and the measurement of the thermal hydraulic performance and the corrosion rate of the lead-bismuth pump is essential.
At present, some scholars in China carry out relevant researches on the thermal hydraulic characteristics of a lead-bismuth loop system, for example, the application publication number is CN 108761022A and the name is a liquid lead-bismuth alloy thermal hydraulic characteristic and corrosion characteristic experimental system. The system carries out detailed research on the thermal hydraulic performance of a lead-bismuth alloy loop system, but the system has a very complex structure and is difficult to popularize, the design aim of the system is mainly to measure the thermal hydraulic performance of the lead-bismuth alloy, and the thermal hydraulic characteristics and the corrosion rate of a lead-bismuth pump cannot be deeply researched. For another example, the name of application publication No. CN 106837769 a is a lead bismuth alloy bubble pump circulation capability experimental system and experimental method thereof. The system has a simple structure, but can only measure the circulating capacity of the lead bismuth alloy bubble pump, and cannot meet the measurement research of the thermal hydraulic characteristics and the corrosion rate of the lead bismuth pump.
Disclosure of Invention
The invention aims to provide a high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system and an experiment method thereof, so as to make up for the defects of the technology and realize measurement, analysis and research on the thermal hydraulic performance and the corrosion rate of the high-temperature lead-bismuth pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system comprises an argon control loop and an experiment test loop; wherein:
the argon control loop comprises an argon bottle 1, an argon buffer tank 2, an argon buffer tank outlet pressure measuring device 3-12, a first air valve 1-1, a second air valve 1-2, a third air valve 1-3, a fourth air valve 1-4 and a fifth air valve 1-5 which are arranged on the main gas pipeline and connected together in series through the main gas pipeline;
the experimental test loop comprises a heating section 8, a lead bismuth-argon expansion tank 3, a novel high-temperature lead bismuth pump 5, a lead bismuth pump motor 4, an electromagnetic flowmeter 7, a lead bismuth storage tank 6, a lead bismuth heating device 9, a lead bismuth control valve 2-1, a lead bismuth storage tank temperature measuring device 3-11, a lead bismuth storage tank pressure measuring device 3-10, a heating section front temperature measuring device 3-1, a heating section front pressure measuring device 3-2, a heating section rear temperature measuring device 3-4, a heating section rear pressure measuring device 3-3, a lead bismuth-argon expansion tank pressure measuring device 3-5, a lead bismuth-argon expansion tank liquid level meter 4-1, a lead bismuth pump front pressure measuring device 3-7, a lead bismuth pump front temperature measuring device 3-6, a lead bismuth pump rear pressure measuring device 3-8, 3-9 parts of a lead-bismuth pump rear temperature measuring device and 5-1 parts of an electromagnetic surface relative flow velocity measuring device;
a lead bismuth outlet pipeline of the lead bismuth storage tank 6 extends out from the top of the storage tank and then extends to a first three-way point A, and a lead bismuth control valve 2-1 is welded on the lead bismuth storage tank 6; an exhaust pipeline of the lead bismuth storage tank 6 is connected with the atmospheric environment, and a fourth air valve 1-4 is welded on the exhaust pipeline; a lead bismuth storage tank temperature measuring device 3-11, a lead bismuth storage tank pressure measuring device 3-10 and a lead bismuth heating device 9 are arranged in the lead bismuth storage tank 6; an outlet pipeline of the heating section 8 is connected with the lead bismuth-argon expansion tank 3, an inlet of the heating section 8 is connected with a first three-way point A, a heating section front temperature measuring device 3-1 and a heating section front pressure measuring device 3-2 are arranged at the inlet, and a heating section rear temperature measuring device 3-4 and a heating section rear pressure measuring device 3-3 are arranged at the outlet; an argon outlet pipeline of the lead bismuth-argon expansion tank 3 is communicated with the atmosphere, and a third air valve 1-3 is welded on the argon outlet pipeline of the lead bismuth-argon expansion tank 3; a lead bismuth-argon expansion tank pressure measuring device 3-5 and a lead bismuth-argon expansion tank liquid level measuring meter 4-1 are arranged in the lead bismuth-argon expansion tank 3; a lead bismuth-argon expansion tank 3, a lead bismuth outlet pipeline and a novel high-temperature lead bismuth pump 5 are connected, the novel high-temperature lead bismuth pump 5 is driven by an external lead bismuth pump motor 4, an electromagnetic surface relative flow velocity measuring device 5-1 is arranged in the novel high-temperature lead bismuth pump 5, an inlet of the novel high-temperature lead bismuth pump 5 is provided with a lead bismuth pre-pump temperature measuring device 3-6 and a lead bismuth pre-pump pressure measuring device 3-7, an outlet is provided with a lead bismuth post-pump temperature measuring device 3-9 and a lead bismuth post-pump pressure measuring device 3-8, and an outlet of the novel high-temperature lead bismuth pump 5 is also provided with an electromagnetic flowmeter 7; the outlet of the novel high-temperature lead-bismuth pump 5 is connected with a first three-way point A to form an experimental test loop; an outlet pipeline of the argon bottle 1 is connected with an argon buffer tank 2, and a first air valve 1-1 is welded on the outlet pipeline of the argon bottle 1; an outlet of the argon buffer tank 2 is connected with a second three-way point B, and an argon buffer tank outlet pressure measuring device 3-12 is arranged in a pipeline between the argon buffer tank 2 and the second three-way point B; one end of a second three-way point B is connected with the top end of the lead bismuth storage tank 6, one end of the second three-way point B is connected with the lead bismuth-argon expansion tank 3, and a fifth air valve 1-5 is welded on a connecting pipeline of the second three-way point B and the lead bismuth storage tank 6; and a second air valve 1-2 is welded on the pipeline between the second three-way point B and the lead bismuth-argon expansion tank 3.
The novel high-temperature lead-bismuth pump 5 is driven by the external motor 4, the novel high-temperature lead-bismuth pump 5 can be quickly disassembled and assembled, the novel high-temperature lead-bismuth pump 5 comprises a pump shaft 51 and a pump blade 52, and the blade 52 is positioned on the pump shaft 51 and directly inserted into a pipeline for use; according to the characteristics of the high-temperature lead bismuth pump, the high-temperature lead bismuth pump is divided into an inlet section, a pressure boosting section, a blade section and an outlet section.
The experimental method of the high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experimental system comprises the following steps:
step 1: lead bismuth filling of experimental test loop
Before the loop is started, the lead bismuth control valve 2-1 and all gas valves are in a closed state. Firstly, sequentially opening a fourth air valve 1-4, a fifth air valve 1-5 and a first air valve 1-1 in sequence, and observing pressure changes at an outlet of an argon buffer tank 2 and in a lead bismuth storage tank 6; after the valve is opened, argon enters the lead bismuth storage tank 6, and air in the lead bismuth storage tank 6 is emptied; closing the first air valve 1-1, the fourth air valve 1-4 and the fifth air valve 1-5, and preheating the lead bismuth storage tank 6 to enable the temperature of lead bismuth to reach 300 ℃; then opening a first air valve 1-1, a fifth air valve 1-5, a third air valve 1-3 and a lead bismuth control valve 2-1, pressing a lead bismuth alloy into an experimental test loop through high-pressure argon, and observing the pressure change condition in a lead bismuth storage tank 6; observing a lead bismuth-argon expansion tank liquid level measuring meter 4-1 on a lead bismuth-argon expansion tank 3, closing a fifth air valve 1-5 and a lead bismuth control valve 2-1 when the lead bismuth liquid level in the lead bismuth-argon expansion tank 3 reaches a specified height, opening a second air valve 1-2, adjusting the opening and closing of the second air valve 1-2 and a third air valve 1-3, observing the pressure change condition in the lead bismuth-argon expansion tank 3, and closing the first air valve 1-1, the second air valve 1-2 and the third air valve 1-3 after reaching a specified working pressure;
step 2: test loop starting and running debugging
Starting a lead bismuth pump motor 4, enabling liquid lead bismuth in an experimental test loop to circularly flow under the driving of a novel high-temperature lead bismuth pump 5, and recording the time from the moment to the stop of the lead bismuth pump; starting the heating section 8 for heating, observing the temperature conditions before and after the heating section 8 and before and after the lead bismuth pump, waiting for the experimental requirements to be met and keeping stable;
and step 3: carry out the experiment
After the experiment test loop is debugged, the electromagnetic flowmeter 7 acquires an experiment test loop flow signal, and the experiment test loop flow signal is obtained through a formula:
wherein Q is the flow and S is the cross-sectional area of the pipeline;
calculating the flow speed of lead and bismuth at the outlet of the novel high-temperature lead and bismuth pump; acquiring temperature and pressure signals before and after a lead bismuth pump through a lead bismuth pre-pump temperature measuring device 3-6, a lead bismuth post-pump temperature measuring device 3-9, a lead bismuth pre-pump pressure measuring device 3-7 and a lead bismuth post-pump pressure measuring device 3-8;
the related thermal hydraulic performance of the pump is calculated by the following formula through the pressure and temperature signals of the collected novel high-temperature lead bismuth pump:
novel high-temperature lead-bismuth pump lift H simulation calculation formula
In the formula: pinletThe total pressure/Pa of the inlet of the novel high-temperature lead bismuth pump is reduced; poutletThe total pressure/Pa of the outlet of the novel high-temperature lead bismuth pump; rho-density/kg-m of novel high-temperature lead bismuth alloy fluid3(ii) a g-acceleration of gravity/m.s2；
Hydraulic efficiency eta of high-temp. lead-bismuth pumphFormula for calculation
In the formula: m is the sum of moment on the wall surface of the movable impeller/N.m; omega-angular velocity of rotation/rad · s of the impeller-1
(3) Novel high-temperature lead bismuth pump volumetric efficiency etavFormula for calculation
In the formula: n iss-the design specific speed of the axial flow lead-bismuth pump;
novel calculation of total efficiency eta of high-temperature lead bismuth pump
In the formula: delta PdFriction loss in the new high-temperature lead-bismuth pump, when the specific speed n of the new high-temperature lead-bismuth pump issWhen the value is less than 65, the calculation formula is
ΔPd＝0.133×10-3ρRe0.134ω3(D/2)3D2,Re＝106×ω(D/2)2
In the formula: d is the diameter of the pipeline;
specific speed n of novel high-temperature lead-bismuth pumpsGreater than 65 times
ΔPd＝0.35×10-2kρω3R5,k＝0.8～1
In the formula: and R is the radius of the cylindrical flow layer where the plane blade cascade is located.
Specific speed nsAnd the rotational angular velocity omega of the impeller is directly obtained from the rated parameters of the driving motor;
shaft power P
In addition, the acquired temperature signals are used for other related calculations according to actual requirements except for calculating the influence of the high-temperature lead-bismuth pump on the work of the lead-bismuth alloy;
and 4, step 4: test loop for closing experiment
After data acquisition is finished, the heating section 8 is closed to heat, and the lead-bismuth pump motor 4 is closed; opening a first air valve 1-1, observing the outlet pressure of the argon buffer tank 2, and waiting for the pressure to be stable; opening the lead bismuth control valve 2-1 and the second air valve 1-2, and simultaneously opening the fourth air valve 1-4 to keep the pressure of the lead bismuth storage tank 6 consistent with the atmospheric pressure; liquid lead bismuth is pressed into a lead bismuth storage tank 6 through high-pressure argon; after the liquid lead bismuth completely flows back to the lead bismuth storage tank 6, all valves are closed;
and 5: detachable lead-bismuth pump
After the experimental test loop works for a certain time, when the loop is shut down, opening a seal, and detaching and taking out the novel high-temperature lead bismuth pump blade from the experimental test loop;
step 6: observation of blade erosion Rate
Taking out the novel high-temperature lead-bismuth pump blade, cleaning the lead-bismuth alloy on the surface by using a solution, scanning and recording the corrosion condition of the lead-bismuth pump blade by using a scanner, obtaining the corrosion depth and the corrosion position of the surface of the novel high-temperature lead-bismuth pump blade by scanning, and making a relation graph of the corrosion depth, the flow rate of the lead-bismuth alloy and the working time by combining the measured flow rate of the lead-bismuth pump outlet lead-bismuth alloy and the working time of the lead-bismuth pump so as to interpret the corrosion rate of the novel high-temperature lead-bismuth pump blade; meanwhile, the corrosion distribution map is integrated, and the optimal adjustment can be carried out on the relevant position in the future.
Compared with the prior art, the invention has the following advantages:
1. the invention has simple structure and low cost.
2. The invention has good safety performance, and the pressure stability of the system can be effectively ensured by introducing the devices such as the argon buffer tank, the lead bismuth-argon expansion tank and the like.
3. The liquid level meter in the lead bismuth-argon expansion tank can effectively observe and control the lead bismuth amount in the experimental test loop, so that the excessive use of the lead bismuth is prevented while the sufficient test amount is ensured.
4. The invention more comprehensively tests the thermal hydraulic performance of the high-temperature lead-bismuth pump by additionally arranging the temperature, pressure and flow measuring devices at key point positions, and overcomes the defect that the prior art does not carry out targeted thermal hydraulic performance measurement on the high-temperature lead-bismuth pump.
5. The corrosion condition of the high-temperature lead bismuth pump after working can be observed, and an experimental basis is provided for further prolonging the working life of the high-temperature lead bismuth pump and optimizing corrosion resistance. Overcomes the defect that the corrosion condition of the high-temperature lead-bismuth pump cannot be observed in the prior art.
Drawings
FIG. 1 is a schematic diagram of an experimental system of the present invention.
FIG. 2 is a schematic structural diagram of a novel high-temperature lead-bismuth pump.
Wherein 1 is an argon bottle; 2 is an argon buffer tank; 3 is a lead bismuth-argon expansion tank; 4 is a motor; 5, a novel high-temperature lead-bismuth pump; 6 is a lead bismuth storage tank; 7 is an electromagnetic flowmeter; 8 is a heating section; 9 is a heating device of the lead bismuth storage tank; 1-1 is a first air valve; 1-2 is a second air valve; 1-3 is a third air valve; 1-4 is a fourth air valve; 1-5 is a fifth air valve; 1-1 is a lead bismuth control valve; 3-1, a temperature measuring device in front of the heating section; 3-2 is a pressure measuring device in front of the heating section; 3-3 is a pressure measuring device behind the heating section; 3-4 is a temperature measuring device after the heating section; 3-5 is a lead bismuth-argon gas expansion tank pressure measuring device; 3-6 is a lead bismuth temperature measuring device before the pump; 3-7 is a lead bismuth pump front pressure measuring device; 3-8 is a lead-bismuth pump rear pressure measuring device; 3-9 is a lead bismuth post-pump temperature measuring device; 3-10 is a pressure measuring device of the lead bismuth storage tank; 3-11 is a temperature measuring device for the lead bismuth storage tank; 4-1 is a lead bismuth-argon gas expansion tank liquid level probe; 5-1 is an electromagnetic surface relative flow velocity measuring device; the pump shaft 51 is used as a pump shaft; and 52 is a pump blade.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measuring experimental system comprises an argon control loop and an experimental test loop; wherein:
the argon control loop comprises an argon bottle 1, an argon buffer tank 2, an argon buffer tank outlet pressure measuring device 3-12, a first air valve 1-1, a second air valve 1-2, a third air valve 1-3, a fourth air valve 1-4 and a fifth air valve 1-5 which are arranged on the main gas pipeline and connected together in series through the main gas pipeline;
the experimental test loop comprises a heating section 8, a lead bismuth-argon expansion tank 3, a novel high-temperature lead bismuth pump 5, a lead bismuth pump motor 4, an electromagnetic flowmeter 7, a lead bismuth storage tank 6, a lead bismuth heating device 9, a lead bismuth control valve 2-1, a lead bismuth storage tank temperature measuring device 3-11, a lead bismuth storage tank pressure measuring device 3-10, a heating section front temperature measuring device 3-1, a heating section front pressure measuring device 3-2, a heating section rear temperature measuring device 3-4, a heating section rear pressure measuring device 3-3, a lead bismuth-argon expansion tank pressure measuring device 3-5, a lead bismuth-argon expansion tank liquid level meter 4-1, a lead bismuth pump front pressure measuring device 3-7, a lead bismuth pump front temperature measuring device 3-6, a lead bismuth pump rear pressure measuring device 3-8, 3-9 parts of a lead-bismuth pump rear temperature measuring device and 5-1 parts of an electromagnetic surface relative flow velocity measuring device;
a lead bismuth outlet pipeline of the lead bismuth storage tank 6 extends out from the top of the storage tank and then extends to a first three-way point A, and a lead bismuth control valve 2-1 is welded on the lead bismuth storage tank 6; an exhaust pipeline of the lead bismuth storage tank 6 is connected with the atmospheric environment, and a fourth air valve 1-4 is welded on the exhaust pipeline; a lead bismuth storage tank temperature measuring device 3-11, a lead bismuth storage tank pressure measuring device 3-10 and a lead bismuth heating device 9 are arranged in the lead bismuth storage tank 6; an outlet pipeline of the heating section 8 is connected with the lead bismuth-argon expansion tank 3, an inlet of the heating section 8 is connected with a first three-way point A, a heating section front temperature measuring device 3-1 and a heating section front pressure measuring device 3-2 are arranged at the inlet, and a heating section rear temperature measuring device 3-4 and a heating section rear pressure measuring device 3-3 are arranged at the outlet; an argon outlet pipeline of the lead bismuth-argon expansion tank 3 is communicated with the atmosphere, and a third air valve 1-3 is welded on the argon outlet pipeline of the lead bismuth-argon expansion tank 3; a lead bismuth-argon expansion tank pressure measuring device 3-5 and a lead bismuth-argon expansion tank liquid level measuring meter 4-1 are arranged in the lead bismuth-argon expansion tank 3; a lead bismuth-argon expansion tank 3, a lead bismuth outlet pipeline and a novel high-temperature lead bismuth pump 5 are connected, the novel high-temperature lead bismuth pump 5 is driven by an external lead bismuth pump motor 4, an electromagnetic surface relative flow velocity measuring device 5-1 is arranged in the novel high-temperature lead bismuth pump 5, an inlet of the novel high-temperature lead bismuth pump 5 is provided with a lead bismuth pre-pump temperature measuring device 3-6 and a lead bismuth pre-pump pressure measuring device 3-7, an outlet is provided with a lead bismuth post-pump temperature measuring device 3-9 and a lead bismuth post-pump pressure measuring device 3-8, and an outlet of the novel high-temperature lead bismuth pump 5 is also provided with an electromagnetic flowmeter 7; the outlet of the novel high-temperature lead-bismuth pump 5 is connected with a first three-way point A to form an experimental test loop; an outlet pipeline of the argon bottle 1 is connected with an argon buffer tank 2, and a first air valve 1-1 is welded on the outlet pipeline of the argon bottle 1; an outlet of the argon buffer tank 2 is connected with a second three-way point B, and an argon buffer tank outlet pressure measuring device 3-12 is arranged in a pipeline between the argon buffer tank 2 and the second three-way point B; one end of a second three-way point B is connected with the top end of the lead bismuth storage tank 6, one end of the second three-way point B is connected with the lead bismuth-argon expansion tank 3, and a fifth air valve 1-5 is welded on a connecting pipeline of the second three-way point B and the lead bismuth storage tank 6; and a second air valve 1-2 is welded on the pipeline between the second three-way point B and the lead bismuth-argon expansion tank 3.
As shown in fig. 2, the novel high-temperature lead-bismuth pump 5 is driven by an external motor 4, the novel high-temperature lead-bismuth pump 5 can be quickly disassembled and assembled, the novel high-temperature lead-bismuth pump 5 comprises a pump shaft 51 and a pump blade 52, and the blade 52 is positioned on the pump shaft 51 and is directly inserted into a pipeline for use; according to the characteristics of the high-temperature lead bismuth pump, the high-temperature lead bismuth pump is divided into an inlet section, a pressure boosting section, a blade section and an outlet section.
As shown in figure 1, the experimental method of the high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experimental system comprises the following steps:
step 1: lead bismuth filling of experimental test loop
Before the loop is started, the lead bismuth control valve 2-1 and all gas valves are in a closed state. Firstly, sequentially opening a fourth air valve 1-4, a fifth air valve 1-5 and a first air valve 1-1 in sequence, and observing pressure changes at an outlet of an argon buffer tank 2 and in a lead bismuth storage tank 6; after the valve is opened, argon enters the lead bismuth storage tank 6, and air in the lead bismuth storage tank 6 is emptied; closing the first air valve 1-1, the fourth air valve 1-4 and the fifth air valve 1-5, and preheating the lead bismuth storage tank 6 to enable the temperature of lead bismuth to reach 300 ℃; then opening a first air valve 1-1, a fifth air valve 1-5, a third air valve 1-3 and a lead bismuth control valve 2-1, pressing a lead bismuth alloy into an experimental test loop through high-pressure argon, and observing the pressure change condition in a lead bismuth storage tank 6; observing a lead bismuth-argon expansion tank liquid level measuring meter 4-1 on a lead bismuth-argon expansion tank 3, closing a fifth air valve 1-5 and a lead bismuth control valve 2-1 when the lead bismuth liquid level in the lead bismuth-argon expansion tank 3 reaches a specified height, opening a second air valve 1-2, adjusting the opening and closing of the second air valve 1-2 and a third air valve 1-3, observing the pressure change condition in the lead bismuth-argon expansion tank 3, and closing the first air valve 1-1, the second air valve 1-2 and the third air valve 1-3 after reaching a specified working pressure;
step 2: test loop starting and running debugging
Starting a lead bismuth pump motor 4, enabling liquid lead bismuth in an experimental test loop to circularly flow under the driving of a novel high-temperature lead bismuth pump 5, and recording the time from the moment to the stop of the lead bismuth pump; starting the heating section 8 for heating, observing the temperature conditions before and after the heating section 8 and before and after the lead bismuth pump, waiting for the experimental requirements to be met and keeping stable;
and step 3: carry out the experiment
After the experiment test loop is debugged, the electromagnetic flowmeter 7 acquires an experiment test loop flow signal, and the experiment test loop flow signal is obtained through a formula:
wherein Q is the flow and S is the cross-sectional area of the pipeline;
calculating the flow speed of lead and bismuth at the outlet of the novel high-temperature lead and bismuth pump; acquiring temperature and pressure signals before and after a lead bismuth pump through a lead bismuth pre-pump temperature measuring device 3-6, a lead bismuth post-pump temperature measuring device 3-9, a lead bismuth pre-pump pressure measuring device 3-7 and a lead bismuth post-pump pressure measuring device 3-8;
the related thermal hydraulic performance of the pump is calculated by the following formula through the pressure and temperature signals of the collected novel high-temperature lead bismuth pump:
novel high-temperature lead-bismuth pump lift H simulation calculation formula
In the formula: pinletThe total pressure/Pa of the inlet of the novel high-temperature lead bismuth pump is reduced; poutletThe total pressure/Pa of the outlet of the novel high-temperature lead bismuth pump; rho-density/kg-m of novel high-temperature lead bismuth alloy fluid3(ii) a g-acceleration of gravity/m.s2。
Hydraulic efficiency eta of high-temp. lead-bismuth pumphFormula for calculation
In the formula: m is the sum of moment on the wall surface of the movable impeller/N.m; omega-angular velocity of rotation/rad · s of the impeller-1；
(3) Novel high-temperature lead bismuth pump volumetric efficiency etavFormula for calculation
In the formula: n iss-the design specific speed of the axial flow lead-bismuth pump;
novel calculation of total efficiency eta of high-temperature lead bismuth pump
In the formula: delta PdFriction loss in the new high-temperature lead-bismuth pump, when the specific speed n of the new high-temperature lead-bismuth pump issWhen the value is less than 65, the calculation formula is
ΔPd＝0.133×10-3ρRe0.134ω3(D/2)3D2,Re＝106×ω(D/2)2
In the formula: d is the diameter of the pipeline;
specific speed n of novel high-temperature lead-bismuth pumpsGreater than 65 times
ΔPd＝0.35×10-2kρω3R5,k＝0.8～1
In the formula: and R is the radius of the cylindrical flow layer where the plane blade cascade is located.
Specific speed nsAnd the rotational angular velocity omega of the impeller is directly obtained from the rated parameters of the driving motor;
shaft power P
In addition, the acquired temperature signals are used for other related calculations according to actual requirements except for calculating the influence of the high-temperature lead-bismuth pump on the work of the lead-bismuth alloy;
and 4, step 4: test loop for closing experiment
After data acquisition is finished, the heating section 8 is closed to heat, and the lead-bismuth pump motor 4 is closed; opening a first air valve 1-1, observing the outlet pressure of the argon buffer tank 2, and waiting for the pressure to be stable; opening the lead bismuth control valve 2-1 and the second air valve 1-2, and simultaneously opening the fourth air valve 1-4 to keep the pressure of the lead bismuth storage tank 6 consistent with the atmospheric pressure; liquid lead bismuth is pressed into a lead bismuth storage tank 6 through high-pressure argon; after the liquid lead bismuth completely flows back to the lead bismuth storage tank 6, all valves are closed;
and 5: detachable lead-bismuth pump
After the experimental test loop works for a certain time, when the loop is shut down, opening a seal, and detaching and taking out the novel high-temperature lead bismuth pump blade from the experimental test loop;
step 6: observation of blade erosion Rate
Taking out the novel high-temperature lead-bismuth pump blade, cleaning the lead-bismuth alloy on the surface by using a solution, scanning and recording the corrosion condition of the lead-bismuth pump blade by using a scanner, obtaining the corrosion depth and the corrosion position of the surface of the novel high-temperature lead-bismuth pump blade by scanning, and making a relation graph of the corrosion depth, the flow rate of the lead-bismuth alloy and the working time by combining the measured flow rate of the lead-bismuth pump outlet lead-bismuth alloy and the working time of the lead-bismuth pump so as to interpret the corrosion rate of the novel high-temperature lead-bismuth pump blade; meanwhile, the corrosion distribution map is integrated, and the optimal adjustment can be carried out on the relevant position in the future.
The use and operation of the system loop prove that the loop has reasonable design and safe operation, and can complete the measurement experiment of the thermal hydraulic performance and the corrosion rate of the high-temperature lead bismuth pump.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system is characterized by comprising an argon control loop and an experiment test loop; wherein:
the argon control loop comprises an argon bottle (1), an argon buffer tank (2), an argon buffer tank outlet pressure measuring device (3-12), a first air valve (1-1), a second air valve (1-2), a third air valve (1-3), a fourth air valve (1-4) and a fifth air valve (1-5) which are arranged on the gas main pipeline and connected together in series through the main pipeline;
the experimental test loop comprises a heating section (8), a lead bismuth-argon expansion tank (3), a novel high-temperature lead bismuth pump (5), a lead bismuth pump motor (4), an electromagnetic flowmeter (7), a lead bismuth storage tank (6), a lead bismuth heating device (9), a lead bismuth control valve (2-1), a lead bismuth storage tank temperature measuring device (3-11), a lead bismuth storage tank pressure measuring device (3-10), a heating section front temperature measuring device (3-1), a heating section front pressure measuring device (3-2), a heating section rear temperature measuring device (3-4), a heating section rear pressure measuring device (3-3), a lead bismuth-argon expansion tank pressure measuring device (3-5), a lead bismuth-argon expansion tank liquid level measuring meter (4-1), a lead bismuth pump front pressure measuring device (3-7), A lead bismuth pump front temperature measuring device (3-6), a lead bismuth pump rear pressure measuring device (3-8), a lead bismuth pump rear temperature measuring device (3-9) and an electromagnetic surface relative flow velocity measuring device (5-1);
a lead bismuth outlet pipeline of the lead bismuth storage tank (6) extends out from the top of the storage tank and then extends to a first three-way point (A), and a lead bismuth control valve (2-1) is welded on the lead bismuth storage tank (6) outlet pipeline; an exhaust pipeline of the lead bismuth storage tank (6) is connected with the atmospheric environment, and a fourth air valve (1-4) is welded on the exhaust pipeline; a lead bismuth storage tank temperature measuring device (3-11), a lead bismuth storage tank pressure measuring device (3-10) and a lead bismuth heating device (9) are arranged in the lead bismuth storage tank (6); an outlet pipeline of the heating section (8) is connected with the lead bismuth-argon expansion tank (3), an inlet of the heating section (8) is connected with a first three-way point (A), a heating section front temperature measuring device (3-1) and a heating section front pressure measuring device (3-2) are arranged at the inlet, and a heating section rear temperature measuring device (3-4) and a heating section rear pressure measuring device (3-3) are arranged at the outlet; an argon outlet pipeline of the lead bismuth-argon expansion tank (3) is communicated with the atmosphere, and a third air valve (1-3) is welded on the argon outlet pipeline of the lead bismuth-argon expansion tank (3); a lead bismuth-argon expansion tank pressure measuring device (3-5) and a lead bismuth-argon expansion tank liquid level measuring meter (4-1) are arranged in the lead bismuth-argon expansion tank (3); a lead bismuth outlet pipeline of the lead bismuth-argon expansion tank (3) is connected with a novel high-temperature lead bismuth pump (5), the novel high-temperature lead bismuth pump (5) is driven by an external lead bismuth pump motor (4), an electromagnetic surface relative flow velocity measuring device (5-1) is arranged in the novel high-temperature lead bismuth pump (5), a lead bismuth pump front temperature measuring device (3-6) and a lead bismuth pump front pressure measuring device (3-7) are arranged at the inlet of the novel high-temperature lead bismuth pump (5), a lead bismuth pump rear temperature measuring device (3-9) and a lead bismuth pump rear pressure measuring device (3-8) are arranged at the outlet of the novel high-temperature lead bismuth pump (5), and an electromagnetic flow meter (7) is further arranged at the outlet of the novel high-temperature lead bismuth pump (5); the outlet of the novel high-temperature lead-bismuth pump (5) is connected with a first three-way point (A) to form an experimental test loop; an outlet pipeline of the argon bottle (1) is connected with an argon buffer tank (2), and a first air valve (1-1) is welded on the outlet pipeline of the argon bottle (1); an outlet of the argon buffer tank (2) is connected with a second three-way point (B), and an argon buffer tank outlet pressure measuring device (3-12) is arranged between the argon buffer tank (2) and the second three-way point (B) through a pipeline; one end of a second three-way point (B) is connected with the top end of the lead bismuth storage tank (6), one end of the second three-way point (B) is connected with the lead bismuth-argon expansion tank (3), and a fifth air valve (1-5) is welded on a connecting pipeline of the second three-way point (B) and the lead bismuth storage tank (6); a second air valve (1-2) is welded on a pipeline between the second three-way point (B) and the lead bismuth-argon expansion tank (3);
the experimental method of the high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experimental system comprises the following steps:
step 1: lead bismuth filling of experimental test loop
Before the loop is started, the lead bismuth control valve (2-1) and all gas valves are in a closed state; firstly, sequentially opening a fourth air valve (1-4), a fifth air valve (1-5) and a first air valve (1-1) in sequence, and observing pressure changes at an outlet of an argon buffer tank (2) and in a lead bismuth storage tank (6); after a valve is opened, argon enters the lead bismuth storage tank (6), and air in the lead bismuth storage tank (6) is emptied; closing the first air valve (1-1), the fourth air valve (1-4) and the fifth air valve (1-5), and preheating the lead bismuth storage tank (6) to enable the temperature of lead bismuth to reach 300 ℃; then opening a first air valve (1-1), a fifth air valve (1-5), a third air valve (1-3) and a lead bismuth control valve (2-1), pressing a lead bismuth alloy into an experimental test loop through high-pressure argon, and observing the pressure change condition in a lead bismuth storage tank (6); observing a lead bismuth-argon expansion tank liquid level measuring meter (4-1) on the lead bismuth-argon expansion tank (3), closing a fifth air valve (1-5) and a lead bismuth control valve (2-1) when the lead bismuth liquid level in the lead bismuth-argon expansion tank (3) reaches a specified height, opening a second air valve (1-2), adjusting the opening and closing of the second air valve (1-2) and a third air valve (1-3), observing the pressure change condition in the lead bismuth-argon expansion tank (3), and closing the first air valve (1-1), the second air valve (1-2) and the third air valve (1-3) after a specified working pressure is reached;
step 2: test loop starting and running debugging
Starting a lead bismuth pump motor (4), enabling liquid lead bismuth in an experimental test loop to circularly flow under the driving of a novel high-temperature lead bismuth pump (5), and recording the time from the moment to the stop of the lead bismuth pump; starting the heating section (8) for heating, observing the temperature conditions before and after the heating section (8) and before and after the lead bismuth pump, and waiting for the experiment requirements to be met and keeping stable;
and step 3: carry out the experiment
After the experiment test loop is debugged, acquiring an experiment test loop flow signal through an electromagnetic flowmeter (7), and obtaining the flow signal through a formula:
wherein Q is the flow and S is the cross-sectional area of the pipeline;
calculating the flow speed of lead and bismuth at the outlet of the novel high-temperature lead and bismuth pump; acquiring front and rear temperature and pressure signals of a lead bismuth pump through a lead bismuth pump front temperature measuring device (3-6), a lead bismuth pump rear temperature measuring device (3-9), a lead bismuth pump front pressure measuring device (3-7) and a lead bismuth pump rear pressure measuring device (3-8);
the related thermal hydraulic performance of the pump is calculated by the following formula through the pressure and temperature signals of the collected novel high-temperature lead bismuth pump:
novel high-temperature lead-bismuth pump lift H simulation calculation formula
In the formula: pinletThe total pressure/Pa of the inlet of the novel high-temperature lead bismuth pump is reduced; poutletThe total pressure/Pa of the outlet of the novel high-temperature lead bismuth pump; rho-density/kg-m of novel high-temperature lead bismuth alloy fluid3(ii) a g-acceleration of gravity/m.s2；
Hydraulic efficiency eta of high-temp. lead-bismuth pumphFormula for calculation
In the formula: m is the sum of moment on the wall surface of the movable impeller/N.m; omega-angular velocity of rotation/rad · s of the impeller-1；
(3) Novel high-temperature lead bismuth pump volumetric efficiency etavFormula for calculation
In the formula: n iss-the design specific speed of the axial flow lead-bismuth pump;
novel calculation of total efficiency eta of high-temperature lead bismuth pump
In the formula: delta PdFriction loss in the new high-temperature lead-bismuth pump, when the specific speed n of the new high-temperature lead-bismuth pump issWhen the value is less than 65, the calculation formula is
ΔPd＝0.133×10-3ρRe0.134ω3(D/2)3D2,Re＝106×ω(D/2)2
In the formula: d is the diameter of the pipeline;
specific speed n of novel high-temperature lead-bismuth pumpsGreater than 65 times
ΔPd＝0.35×10-2kρω3R5,k＝0.8～1
In the formula: r is the radius of a cylindrical flow layer where the plane blade cascade is located;
specific speed nsAnd the rotational angular velocity omega of the impeller is directly obtained from the rated parameters of the driving motor;
shaft power P
In addition, the acquired temperature signals are used for other related calculations according to actual requirements except for calculating the influence of the high-temperature lead-bismuth pump on the work of the lead-bismuth alloy;
and 4, step 4: test loop for closing experiment
After data acquisition is finished, the heating section (8) is closed to heat, and the lead bismuth pump motor (4) is closed; opening a first air valve (1-1), observing the outlet pressure of the argon buffer tank (2), and waiting for the pressure to be stable; opening the lead bismuth control valve (2-1) and the second air valve (1-2), and simultaneously opening the fourth air valve (1-4) to keep the pressure of the lead bismuth storage tank (6) consistent with the atmospheric pressure; liquid lead bismuth is pressed into a lead bismuth storage tank (6) through high-pressure argon; after the liquid lead bismuth completely flows back to the lead bismuth storage tank (6), all valves are closed;
and 5: detachable lead-bismuth pump
After the experimental test loop works for a certain time, when the loop is shut down, opening a seal, and detaching and taking out the novel high-temperature lead bismuth pump blade from the experimental test loop;
step 6: observation of blade erosion Rate
Taking out the novel high-temperature lead-bismuth pump blade, cleaning the lead-bismuth alloy on the surface by using a solution, scanning and recording the corrosion condition of the lead-bismuth pump blade by using a scanner, obtaining the corrosion depth and the corrosion position of the surface of the novel high-temperature lead-bismuth pump blade by scanning, and making a relation graph of the corrosion depth, the flow rate of the lead-bismuth alloy and the working time by combining the measured flow rate of the lead-bismuth pump outlet lead-bismuth alloy and the working time of the lead-bismuth pump so as to interpret the corrosion rate of the novel high-temperature lead-bismuth pump blade; meanwhile, the corrosion distribution map is integrated, and the optimal adjustment can be carried out on the relevant position in the future.
2. The high-temperature lead-bismuth pump thermal hydraulic performance and corrosion rate measurement experiment system of claim 1, which is characterized in that: the novel high-temperature lead-bismuth pump (5) is driven by an external motor (4), the novel high-temperature lead-bismuth pump (5) can be quickly disassembled and assembled, the novel high-temperature lead-bismuth pump (5) comprises a pump shaft (51) and a pump blade (52), and the blade (52) is positioned on the pump shaft (51) and is directly inserted into a pipeline for use; according to the characteristics of the high-temperature lead bismuth pump, the high-temperature lead bismuth pump is divided into an inlet section, a pressure boosting section, a blade section and an outlet section.
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