CN106708111A - Dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content and use method - Google Patents
Dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content and use method Download PDFInfo
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- CN106708111A CN106708111A CN201611248254.0A CN201611248254A CN106708111A CN 106708111 A CN106708111 A CN 106708111A CN 201611248254 A CN201611248254 A CN 201611248254A CN 106708111 A CN106708111 A CN 106708111A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000001301 oxygen Substances 0.000 title claims abstract description 96
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 96
- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 39
- 230000003647 oxidation Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 140
- 238000006392 deoxygenation reaction Methods 0.000 claims abstract description 16
- 239000011261 inert gas Substances 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 22
- 239000012498 ultrapure water Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000010926 purge Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 239000010865 sewage Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000009284 supercritical water oxidation Methods 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000011276 addition treatment Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
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Abstract
The invention discloses a dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content and a using method thereof, belonging to the technical field of test research of metal materials in high-temperature high-pressure water environment. Compared with the prior art, the dynamic steam oxidation test system can realize the dynamic steam oxidation test under the conditions of high temperature and high pressure, can monitor and accurately control the dissolved oxygen content in real time, can control the dissolved oxygen content below 10ppb for a long time, has high deoxygenation efficiency, can automatically run in the steam oxidation test process, does not need to watch, and saves manpower and material resources.
Description
The technical field is as follows:
the invention belongs to the technical field of test research of metal materials in a high-temperature and high-pressure environment, and particularly relates to a dynamic high-temperature and high-pressure steam oxidation test device for controlling oxygen content and a using method thereof.
Background art:
in the field of thermal power generation, along with increasing importance of people on energy conservation and environmental protection, unit parameters are continuously improved, and a superheaterThe problem of steam side oxidation of steam flow components such as reheaters, high temperature steam lines, turbine rotors, blades, nozzles, and the like is also increasing. The development of suitable test equipment is the key to research and solve the problem of metal steam oxidation, wherein a water chemistry control and circulation system is the core of the equipment, and three key factors are provided for ensuring the test result to be reliable: (1) the oxygen content in the steam or water is controllable, and because the content in the steam can influence the oxide layer structure and the oxidation rate of the material, whether the oxygen content in the steam can be controlled to the steam condition (below 10ppb when the water is subjected to total volatilization treatment and 30 ppb-150 ppb when the water is subjected to oxygen addition treatment) when the thermal power generating unit is in actual operation is a key factor for determining whether the test result is reliable. (2) The steam flow cannot be too low, because H is generated in the steam oxidation reaction process2、CrO2(OH)2When the volatile reaction products are static or the flow rate is too low, the volatile reaction products cannot be taken away in time, the reaction enters an equilibrium state, and the test result cannot truly reflect the steam oxidation resistance of the material. (3) The temperature and pressure should be such that supercritical conditions common to utility boilers are achieved. In addition to these three key conditions, the simplicity, reliability, convenience, energy saving and environmental protection of the system must be considered.
Many research units at home and abroad develop steam or supercritical water oxidation test devices, such as patents: patent CN 10162661B "experimental apparatus for high temperature water vapor oxidation of metal material", and CN 103543096 a "experimental apparatus for dynamic high temperature and high pressure oxidation": the main defects of equipment such as a steam oxidation device of a United states NETL laboratory, a supercritical water oxidation device of the United states Wisconsin-Madison university, a laboratory table of Nippon Steel company in Japan, a supercritical water oxidation experimental device for wastewater treatment of Zhejiang industry university and the like are that key factors such as oxygen content in steam and the like cannot be controlled. Patent application document 200810011845.5 "method and apparatus for conducting long-term oxidative corrosion experiments in supercritical water" medium is static. Patent CN 101118211B "high temperature steam oxidation test apparatus" cannot be used for high pressure, and the condensed water needs to be treated periodically, which consumes a large amount of argon gas. Patent CN 102519863A "a supercritical water steam oxidation test device" has realized the supercritical water oxidation environment, but has following shortcoming: (1) the dissolved oxygen content in water is regulated by setting the flow of argon and oxygen, the regulating range is small and can not reach below 10ppb, and the oxygen content can not be observed and controlled in real time; (2) a heating rod is arranged in the waterway for heating, and then a water cooling sleeve is arranged, so that a large amount of electric energy and tap water are wasted; (3) the structure is complicated, the water circulation system is internally provided with three distilled water tanks with sealing structures, and the water tanks are provided with a drain valve, an observation window, a heating pipe, a heat exchanger and other parts, so that the safety and reliability are poor.
The invention content is as follows:
the invention aims to overcome the defects in the loading technology under the high-temperature and high-pressure environment, and provides a dynamic high-temperature and high-pressure steam oxidation test device for controlling oxygen content and a using method thereof.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the dynamic high-temperature high-pressure steam oxidation test device for controlling the oxygen content comprises a water supply assembly, a vacuum deoxygenation assembly, an inert gas deoxygenation assembly, a normal-temperature circulating water loop, a high-temperature high-pressure water loop, a high-pressure reaction kettle and a heating assembly; wherein,
the water supply component comprises a water storage barrel, and a pipeline at the top of the water storage barrel is communicated with the atmosphere through a back pressure valve A and a check valve A in sequence;
the vacuum oxygen removal assembly comprises a vacuum pump;
the inert gas deoxidizing component comprises a proportional solenoid valve, a one-way valve B and an inert gas cylinder;
the normal temperature circulating water loop comprises a circulating pump, a flow cell and a dissolved oxygen meter;
the high-temperature and high-pressure water loop comprises a high-pressure metering pump, a damper, a heat exchanger, a condenser and a back pressure valve B;
the high-pressure reaction kettle and the heating assembly comprise a kettle body heating furnace and a high-pressure reaction kettle;
wherein, the vacuum pump is communicated with the water storage barrel through a pipeline;
the inert gas cylinder is communicated with the inert gas inlet of the water storage barrel through a pipeline, a one-way valve B and a proportional electromagnetic valve which are arranged on the pipeline;
the circulation tank forms a normal temperature circulating water loop with the water storage barrel through a pipeline, a circulating pump and a dissolved oxygen meter which are arranged on the pipeline;
the high-pressure metering pump, the damper, the heat exchanger, the condenser and the back pressure valve form a high-temperature and high-pressure water loop with the water storage barrel through pipelines;
the high-pressure reaction kettle is arranged in the kettle body heating furnace, and the kettle body heating furnace and the heat exchanger form a water circulation loop through a pipeline.
The water supply assembly is further improved in that the water supply assembly further comprises a high-purity water machine and a water supply pump, and the water supply pump is used for adding high-purity water prepared by the high-purity water machine into the water storage barrel.
The invention is further improved in that the water supply assembly also comprises a sewage draining outlet arranged at the bottom of the water storage barrel and a water level meter arranged on the side surface of the water storage barrel.
The invention is further improved in that the vacuum deoxygenation assembly further comprises a pressure gauge A arranged on a pipeline for communicating the vacuum pump with the water storage barrel.
The invention is further improved in that the inert gas cylinder also comprises a dissolved oxygen control system which is connected with the dissolved oxygen meter and the proportional solenoid valve through signal wires.
The invention is further improved in that the normal temperature circulating water loop also comprises a valve arranged on the pipeline.
The invention is further improved in that a dissolved oxygen sensor is arranged in the flow cell, the signal of the dissolved oxygen sensor is integrated into a 4-20mA current signal through a dissolved oxygen meter, the current signal is transmitted to the dissolved oxygen control system, and the dissolved oxygen control system calculates a 4-20mA control signal according to the measured dissolved oxygen value and the set dissolved oxygen value, outputs the 4-20mA control signal to a proportional solenoid valve, controls the switching proportion of the proportional solenoid valve and further controls the introduction amount of the inert gas.
The invention has the further improvement that the high-temperature and high-pressure water loop also comprises a one-way valve C, a pressure gauge B, a first filter and a pressure relief valve which are arranged on the pipeline.
The invention is further improved in that the high-temperature and high-pressure water loop also comprises a water chiller, and the water chiller and the condenser form a water circulation loop through a pipeline.
The use method of the dynamic high-temperature high-pressure steam oxidation test device for controlling the oxygen content comprises the following steps of:
1) adding high-purity water into a water storage barrel;
2) opening a vacuum pump in the vacuum deoxidizing component to vacuumize the water storage barrel;
3) opening the inert gas deoxygenation assembly and the normal-temperature circulating water loop, opening the proportional solenoid valve when the dissolved oxygen content measured by the dissolved oxygen meter is higher than the upper limit of a set value, purging water in the water storage barrel by using inert gas to remove oxygen, discharging escaped gas into the atmosphere through a back pressure valve A and a one-way valve A, closing the proportional solenoid valve when the dissolved oxygen content measured by the dissolved oxygen meter is higher than the upper limit of the set value, and stopping purging by using the inert gas;
4) opening a programmable control kettle body heating furnace to heat up, and heating the temperature in the loop to the expected temperature parameter;
5) and opening the high-temperature high-pressure circulating water loop, adjusting the back pressure valve B to be a test expected pressure parameter, opening the high-pressure metering pump, and starting the test.
Compared with the prior art, the water supply assembly provides high-purity water for the test device, the vacuum deoxygenation assembly, the inert gas deoxygenation assembly and the normal-temperature circulating water loop are matched to accurately control the content of dissolved oxygen in the loop, the high-temperature high-pressure loop, the high-pressure reaction kettle and the heating assembly provide a high-temperature high-pressure environment for a steam oxidation test, and dynamic circulation is achieved. Specifically, the test device of the invention has the advantages that:
1. the testing device can accurately control the dissolved oxygen content to be below 10ppb for a long time by controlling the dissolved oxygen content in the loop through the dissolved oxygen control system.
2. The invention adopts the mode of combining the vacuum oxygen removal component and the inert gas oxygen removal component to remove oxygen, improves the oxygen removal efficiency, and simultaneously can greatly reduce the use amount of inert gas and save the cost.
3. The testing device can adjust the pressure in the high-temperature and high-pressure water loop between 0 and 40MPa through the high-pressure metering pump and the back pressure valve, and the temperature can be controlled between room temperature and 800 ℃ by the kettle heating furnace, so that the requirements of different testing conditions can be met.
4. The invention transfers the heat of the high-temperature effluent in the high-pressure reaction kettle to the low-temperature influent water through a set of heat exchangers, thereby not only reducing the heat loss and saving the energy, but also obviously reducing the effluent temperature, reducing the effluent to the normal temperature after passing through the condenser, and returning the effluent to the water storage barrel after being filtered by the filter for automatic cycle and reuse.
The using method of the testing device has reasonable test sequence arrangement, and particularly has the beneficial effects that:
1. the vacuum pump through among the vacuum deoxidization subassembly earlier gets rid of the dissolved oxygen of a large amount of aquatic to the water storage bucket evacuation, recycles inert gas further deoxidization afterwards, can improve deoxidization efficiency, and the while can the greatly reduced inert gas's use amount practices thrift the test cost.
2. The pressure of the high-pressure kettle is increased to the expected temperature parameter of the test, the back pressure valve B is adjusted to be the expected pressure parameter of the test, and finally the high-pressure metering pump is opened to introduce water into the high-pressure reaction kettle, so that the pressure in the high-pressure reaction kettle can be gradually increased to the expected pressure parameter, and the method is safer and more reliable.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to the present invention.
In the figure: 1 is a high-purity water machine; 2 is a water supply pump; 3 is a water storage barrel; 4 is a back pressure valve A; 5 is a check valve A; 6 is a sewage draining outlet; 7 is a water level meter; 8 is a vacuum pump; 9 is a pressure gauge A; 10 is a proportional electromagnetic valve; 11 is a second filter; 12 is a check valve B; 13 is an inert gas cylinder; 14 is a dissolved oxygen control system; 15 is a circulating pump; 16 is a valve; 17 is a flow-through cell; 18 is a dissolved oxygen meter; 19 is a high-pressure metering pump; 20 is a damper; 21 is a check valve C; 22 is a heat exchanger; 23 is a kettle body heating furnace; 24 is a high-pressure reaction kettle; 25 is a condenser; 26 is a pressure gauge B; 27 is a first filter; 28 is a back pressure valve B; 29 is a pressure release valve; 30 is a water chiller.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content comprises a water supply assembly, a vacuum oxygen removal assembly, an inert gas oxygen removal assembly, a normal-temperature circulating water loop and a high-temperature high-pressure water loop. The specific installation steps are as follows:
the water supply assembly comprises a high-purity water machine 1, a water supply pump 2 and a water storage barrel 3, wherein the high-purity water machine 1, the water supply pump 2 and the water storage barrel 3 are sequentially connected.
The vacuum deoxidization assembly comprises a vacuum pump 8 and a pressure gauge A9, the vacuum pump 8 is communicated with the water storage barrel 3 through a pipeline, and the pressure gauge A9 is arranged on the pipeline.
The top of the water storage barrel 3 is provided with a pipeline which is connected with the atmosphere through a back pressure valve A4 and a one-way valve A5 in sequence. A sewage outlet 6 is arranged at the bottom of the water storage barrel 3, and a water level gauge 7 is arranged on the side surface.
The bottom of the water storage barrel 3 is sequentially connected with a proportional electromagnetic valve 10, a second filter 11, a one-way valve B12 and an inert gas cylinder 13 through pipelines.
The normal temperature circulating water loop is formed by sequentially connecting a valve 16, a circulating pump 15, a circulating pool 17 and a dissolved oxygen meter 18 through pipelines and then returning the loop to the top of the water storage barrel 3.
The system comprises a high-pressure metering pump 19, a damper 20, a one-way valve C21, a cold end of a heat exchanger 22, a kettle body heating furnace 23, a high-pressure reaction kettle 24, a hot end of the heat exchanger 22, a condenser 25, a pressure gauge B26, a first filter 27 and a back pressure valve B28 which are connected through pipelines, wherein the condenser is connected with a water cooler 29. The connecting pipelines of the high-temperature and high-pressure water loop are all metal clamping sleeves.
When a high-temperature steam oxidation test is carried out, firstly, an outlet valve of the water feeding pump 2 is opened, and high-purity water prepared by the high-purity water machine 1 is added into the water storage barrel 3. Then the valve of the vacuum deoxygenation component is opened to vacuumize the water storage barrel 3, most of air dissolved in high-purity water can be discharged, the content of dissolved oxygen in the water is reduced to about 500ppb, then the inert gas deoxygenation component and the normal-temperature circulating water loop are opened, and deoxygenation is carried out by introducing inert gas such as argon into the water storage barrel 3. The flow cell 17 in the normal temperature water loop is internally provided with a dissolved oxygen sensor, the signal of the sensor is integrated into A4-20 mA current signal through a dissolved oxygen meter 18, a dissolved oxygen control system 14 calculates A4-20 mA control signal according to an actual dissolved oxygen value and a set dissolved oxygen value, outputs the control signal to a proportional solenoid valve 10 to control the switching ratio of the proportional solenoid valve, when the actual dissolved oxygen content is higher than the set upper limit, the proportional solenoid valve 10 is opened, inert gas is introduced into the water storage barrel 3, the water in the water storage barrel 3 is purged to remove oxygen, and the escaped gas is discharged into the atmosphere through a back pressure valve A4 and a check valve A5. When the measured dissolved oxygen content is higher than the upper limit of the set value, the proportional solenoid valve 10 is closed, the inert gas purging is stopped, and the normal test can be started. The backpressure valve A4 and the one-way valve A5 ensure that the water storage barrel 3 is in a micro-positive pressure state under an inert gas environment, and dissolved oxygen is prevented from rising again. And then opening a high-temperature high-pressure circulating water loop, adjusting the high-pressure metering pump 19 and the back pressure valve B28 to enable the pressure in the loop to reach the expected pressure parameter of the test, then opening the programmable control kettle body heating furnace 23 to heat up, raising the temperature in the loop to the expected temperature parameter of the test, and then starting the test.
The invention adopts a set of heat exchanger 22 to transfer the heat of the high-temperature outlet water in the high-pressure reaction kettle to the low-temperature inlet water, thereby not only reducing the heat loss and saving the energy, but also obviously reducing the temperature of the outlet water, reducing the temperature of the gas entering the condenser 25 and saving the electric energy required by the water cooler 30, and then the outlet water is filtered by the filter and returned to the water storage tank for recycling. The pressure in the high-temperature high-pressure loop is controlled by a high-pressure metering pump 19 and a back pressure valve B28, and when the pressure is over-pressure in the test process, the pressure can be relieved through a pressure relief valve 29, so that the safety is ensured. The inert gas deoxidization subassembly is in the on-state all the time in the test process, guarantees that dissolved oxygen content controls all the time in the return circuit and sets for the dissolved oxygen within range, because whole experimental apparatus keeps malleation and encapsulated situation, but greatly reduced deoxidization is with inert gas's consumption.
The use method of the dynamic high-temperature high-pressure steam oxidation test device for controlling the oxygen content comprises the following steps:
1) firstly, opening an outlet valve of a water feeding pump 2, and adding high-purity water prepared by a high-purity water machine 1 into a water storage barrel 3;
2) opening a valve of the vacuum deoxidizing component to vacuumize the water storage barrel 3;
3) opening the inert gas deoxygenation assembly and the normal-temperature circulating water loop, when the dissolved oxygen content measured by the dissolved oxygen meter 18 is higher than the upper limit of a set value, opening the proportional solenoid valve 10, purging the water in the water storage barrel 3 by using inert gas to deoxygenate, discharging the escaped gas into the atmosphere through a back pressure valve A4 and a one-way valve A5, and when the dissolved oxygen content measured by the dissolved oxygen meter 18 is higher than the upper limit of the set value, closing the proportional solenoid valve 10 and stopping purging by using the inert gas;
4) opening a high-temperature high-pressure circulating water loop, and adjusting the high-pressure metering pump 19 and the back pressure valve B28 to enable the pressure in the loop to reach the expected pressure parameter of the test;
5) and opening a programmable control kettle body heating furnace 23 to increase the temperature, increasing the temperature in the loop to the expected temperature parameter for testing, and starting the test.
In conclusion, compared with the prior art, the dynamic steam oxidation test device is ingenious in design, can realize the dynamic steam oxidation test under the conditions of high temperature and high pressure, can monitor and accurately control the dissolved oxygen content in real time, can control the dissolved oxygen content to be below 10ppb for a long time, is high in oxygen removal efficiency, can automatically run in the steam oxidation test process, does not need to be watched, and saves manpower and material resources.
Claims (10)
1. The dynamic high-temperature high-pressure steam oxidation test device for controlling the oxygen content is characterized by comprising a water supply assembly, a vacuum deoxygenation assembly, an inert gas deoxygenation assembly, a normal-temperature circulating water loop, a high-temperature high-pressure water loop, a high-pressure reaction kettle and a heating assembly; wherein,
the water supply component comprises a water storage barrel (3), and a pipeline at the top of the water storage barrel (3) is communicated with the atmosphere sequentially through a back pressure valve A (4) and a one-way valve A (5);
the vacuum deoxygenation assembly comprises a vacuum pump (8);
the inert gas deoxygenation assembly comprises a proportional solenoid valve (10), a one-way valve B (12) and an inert gas cylinder (13);
the normal temperature circulating water loop comprises a circulating pump (15), a circulating pool (17) and a dissolved oxygen meter (18);
the high-temperature and high-pressure water loop comprises a high-pressure metering pump (19), a damper (20), a heat exchanger (22), a condenser (25) and a backpressure valve B (28);
the high-pressure reaction kettle and the heating assembly comprise a kettle body heating furnace (23) and a high-pressure reaction kettle (24);
wherein, the vacuum pump (8) is communicated with the water storage barrel (3) through a pipeline;
the inert gas cylinder (13) is communicated with an inert gas inlet of the water storage barrel (3) through a pipeline, a one-way valve B (12) and a proportional solenoid valve (10) which are arranged on the pipeline;
the circulation pool (17) forms a normal temperature circulation water loop with the water storage barrel (3) through a pipeline, a circulation pump (15) and a dissolved oxygen meter (18) which are arranged on the pipeline;
a high-pressure metering pump (19), a damper (20), a heat exchanger (22), a condenser (25) and a backpressure valve (28) form a high-temperature and high-pressure water loop with the water storage barrel (3) through pipelines;
the high-pressure reaction kettle (24) is arranged in the kettle body heating furnace (23), and the kettle body heating furnace (23) and the heat exchanger (22) form a water circulation loop through a pipeline.
2. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, wherein the water supply assembly further comprises a high-purity water machine (1) and a water supply pump (2), and the water supply pump (2) is used for adding high-purity water prepared by the high-purity water machine (1) into the water storage barrel (3).
3. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, wherein the water supply assembly further comprises a sewage draining outlet (6) arranged at the bottom of the water storage barrel (3) and a water level gauge (7) arranged at the side of the water storage barrel (3).
4. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, wherein the vacuum oxygen removal assembly further comprises a pressure gauge A (9) arranged on a pipeline of the vacuum pump (8) communicated with the water storage barrel (3).
5. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, characterized in that the inert gas cylinder (13) further comprises a dissolved oxygen control system (14) connected with the dissolved oxygen meter (18) and the proportional solenoid valve (10) through signal lines.
6. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, wherein the normal-temperature circulating water loop further comprises a valve (16) arranged on the pipeline.
7. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, characterized in that a dissolved oxygen sensor is arranged in the flow cell (17), the signal of the dissolved oxygen sensor is integrated into a current signal of 4-20mA through a dissolved oxygen meter (18), the current signal is transmitted to the dissolved oxygen control system (14), the dissolved oxygen control system (14) calculates a 4-20mA control signal according to the measured dissolved oxygen value and the set dissolved oxygen value, and outputs the 4-20mA control signal to the proportional solenoid valve (10) to control the on-off proportion of the proportional solenoid valve, thereby controlling the introduction amount of the inert gas.
8. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, wherein the high-temperature high-pressure water loop further comprises a one-way valve C (21), a pressure gauge B (26), a first filter (27) and a pressure relief valve (29) which are arranged on the pipeline.
9. The dynamic high-temperature high-pressure steam oxidation test device for controlling oxygen content according to claim 1, wherein the high-temperature high-pressure water loop further comprises a water chiller (30), and the water chiller (30) and the condenser (25) form a water circulation loop through a pipeline.
10. Use of a dynamic high temperature high pressure steam oxidation test unit for controlling oxygen content, characterized in that it is based on a dynamic high temperature high pressure steam oxidation test unit for controlling oxygen content according to any of claims 1 to 9, comprising the steps of:
1) adding high-purity water into the water storage barrel (3);
2) a vacuum pump (8) in the vacuum deoxidizing component is turned on to vacuumize the water storage barrel (3);
3) opening an inert gas deoxygenation assembly and a normal-temperature circulating water loop, when the dissolved oxygen content is higher than the upper limit of a set value as measured by a dissolved oxygen meter (18), opening a proportional solenoid valve (10), purging water in a water storage barrel (3) by using inert gas to deoxygenate, discharging escaped gas into the atmosphere through a back pressure valve A (4) and a one-way valve A (5), when the dissolved oxygen content is higher than the upper limit of the set value as measured by the dissolved oxygen meter (18), closing the proportional solenoid valve (10), and stopping purging by using inert gas;
4) opening a programmable control kettle body heating furnace (23) to increase the temperature, and increasing the temperature in the loop to the expected temperature parameter;
5) and opening the high-temperature high-pressure circulating water loop, adjusting a back pressure valve B (28) to be a test expected pressure parameter, opening the high-pressure metering pump (19), and starting the test.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884332A (en) * | 2017-11-10 | 2018-04-06 | 中国科学院近代物理研究所 | A kind of high flow rate multimode aqueous corrosion experimental provision for controlling oxygen content |
| CN107884331A (en) * | 2017-11-10 | 2018-04-06 | 中国科学院近代物理研究所 | A kind of application method of the high flow rate multimode aqueous corrosion experimental provision of control oxygen content |
| CN109656274A (en) * | 2019-01-24 | 2019-04-19 | 华能国际电力股份有限公司 | System for accurately controlling dissolved oxygen content of experimental water and using method |
| CN111811966A (en) * | 2020-08-07 | 2020-10-23 | 浙江工业大学 | Water circulation system for high-temperature and high-pressure test of pressure-bearing equipment |
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| CN111811966A (en) * | 2020-08-07 | 2020-10-23 | 浙江工业大学 | Water circulation system for high-temperature and high-pressure test of pressure-bearing equipment |
| CN112748063A (en) * | 2020-12-29 | 2021-05-04 | 华东理工大学 | Ultra-long-service-life environmental fatigue test system and method for dynamic intelligent control of dissolved oxygen |
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