CN114166729A - Multistage sulfur trioxide acid mist condensation and precipitation simulation device capable of being used for external measurement equipment - Google Patents
Multistage sulfur trioxide acid mist condensation and precipitation simulation device capable of being used for external measurement equipment Download PDFInfo
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- CN114166729A CN114166729A CN202010957874.1A CN202010957874A CN114166729A CN 114166729 A CN114166729 A CN 114166729A CN 202010957874 A CN202010957874 A CN 202010957874A CN 114166729 A CN114166729 A CN 114166729A
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- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000002253 acid Substances 0.000 title claims abstract description 31
- 239000003595 mist Substances 0.000 title claims abstract description 28
- 238000009833 condensation Methods 0.000 title claims abstract description 24
- 230000005494 condensation Effects 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 title claims abstract description 8
- 238000001556 precipitation Methods 0.000 title claims description 6
- 238000011049 filling Methods 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000012360 testing method Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 241000764238 Isis Species 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
- G01N25/142—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation by condensation
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- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a multistage sulfur trioxide acid mist condensation and drop simulation device capable of being used for external measurement equipment, which comprises a filling unit, a mixed heating unit, a vacuumizing unit and an auxiliary equipment unit.
Description
Technical Field
The invention belongs to the technical field of simulation test of industrial equipment, and particularly relates to a multistage sulfur trioxide acid mist condensation and precipitation simulation device capable of being used for external measurement equipment.
Background
For industrial process equipment such as boilers, pressure vessels and the like, conversion from a gas phase to a liquid phase of a medium often occurs in the process of sudden drop of environmental temperature under a working condition, at the moment, corrosive components of the medium are enriched and precipitated along with a freezing and dropping liquid phase, are dissolved in a liquid-phase water environment to the maximum extent and are deposited in a working condition medium loop, so that the equipment is seriously corroded, and particularly the rigor of the running environment of part of pressure-bearing equipment is enhanced due to the deterioration trend of raw materials in recent years; especially, the content of acid gas components such as SO3 in the medium is increased day by day, SO that the corrosivity of the liquid after condensation is greatly improved, the corrosion risk of the equipment is increased, the tolerance of the corrosion problem generated after condensation of the medium is greatly reduced by combining the development trends of large-scale, high-parameter and high-standardization of the pressure-bearing equipment, and meanwhile, the existing material selection standard and the applicability of the corrosion concept related to the material selection standard are disconnected from the development of actual engineering, SO that unpredictable equipment damage is caused, and the method becomes an important cause of equipment failure.
Currently, there are two main problems in testing the largest freezing and dropping corrosion:
firstly, it is difficult to accurately simulate the condensation process of acid mist in a laboratory, and in dew point corrosion, the condensation process of acid mist has the most important effect on the occurrence of corrosion reaction, and especially when acid mist is formed, different acid atmosphere media have different effects on the formation temperature, formation form and formation concentration of acid mist;
secondly, in the actual working condition process, the temperature is a process of continuously decreasing, actually, the temperature is a certain process, but in the laboratory environment, because external equipment needs to be measured, the uniformity of the environmental temperature of the test equipment is difficult to ensure, so that the test equipment is better adapted to the external equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multistage sulfur trioxide acid mist condensation and drop simulation device which can be used for external measurement equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
can be used to external measuring equipment's multistage sulfur trioxide acid mist congeals and falls analogue means, including filling unit, hybrid heating unit, evacuation unit and auxiliary assembly unit, wherein:
the filling unit is used for adding gas corrosive gas SO into the device according to a rated proportion3Gas medium water vapor and proportioning gas medium N required by atmosphere condensation and precipitation2；
The mixed heating unit is used for introducing corrosive gas SO in the filling unit3Gas medium water vapor and proportioning gas medium N2Mixing and feeding the mixture into a reaction kettle at a certain speed for testing;
the vacuumizing unit is used for vacuumizing a device pipeline and a reaction kettle cavity after the experiment is finished, and discharging residual mixed gas from the device;
and the auxiliary equipment unit is used for realizing the driving of the whole gas drive device of the equipment and tail gas absorption.
Preferably, the filling unit comprises SO3Filling unit, water vapor filling unit and N2Filling unit, said SO3The filling unit comprises an electronic balance, the water vapor filling unit comprises a water vapor generator and a one-way valve, and N is2The filling unit comprises a nitrogen cylinder, a water vapor filling unit and N2The filling units also comprise the electric heater and the pneumatic ball valve.
Preferably, the hybrid heating unit includes buffer tank, reation kettle, bleeder valve and stop valve, the buffer tank adopts 10L buffer tank, reation kettle is provided with two altogether, two reation kettle establishes ties each other.
Preferably, the vacuum pumping unit comprises a vacuum pump, a vacuum gauge, a quick connector and a corrugated pipe.
Preferably, the vacuumizing capacity of the vacuum pump is 1.2KPa, and the speed is 40L/min.
Preferably, the auxiliary equipment unit comprises a gas drive device and a tail gas absorption device, wherein the gas drive device comprises a filtering pressure reducing valve and an electromagnetic valve; the tail gas absorption device comprises a throttle valve, a cooler and an exhaust gas processor.
The invention can be used for the multistage sulfur trioxide acid mist condensation and drop simulation device of the external measuring equipment, and can accurately simulate the condensation and drop process of the acid mist in a laboratory, so that the effect of the condensation and drop process of the acid mist on the occurrence of corrosion reaction can be fully known in dew point corrosion, and particularly, the effect of different acid atmosphere media on the formation temperature, formation form and formation concentration of the acid mist can be generated when the acid mist is formed;
according to the invention, the uniformity of the environmental temperature of the test equipment can be ensured by the mutual matching of the filling unit, the mixing and heating unit, the vacuumizing unit and the auxiliary equipment unit, so that the test equipment is better suitable for external equipment.
Drawings
FIG. 1 is a schematic overall view of a multistage sulfur trioxide acid mist condensation-drop simulation device which can be used for external measurement equipment.
Reference numerals: 1. a buffer tank; 2. a one-way valve; 3. an electric heater; 4. a pneumatic ball valve; 5. a water vapor generator; 6. an electronic balance; 7. a reaction kettle; 8. a throttle valve; 9. a cooler; 10. a filtering pressure reducing valve; 11. a pressure gauge; 12. an electromagnetic valve; 13. a quick-connect joint; 14. a bellows; 15. a vacuum gauge; 16. a vacuum pump; 17. a pressure reducing valve; 18. a nitrogen gas cylinder; 19. a discharge valve; 20. a stop valve; 21. an exhaust gas processor.
Detailed Description
The following further describes a specific embodiment of the multistage sulfur trioxide acid mist condensation-drop simulation device which can be used for external measurement equipment, with reference to the attached drawing 1. The multistage sulfur trioxide acid mist condensation and drop simulation device applicable to the external measuring equipment is not limited to the description of the following embodiment.
Example 1:
the embodiment provides a concrete structure of a multistage sulfur trioxide acid mist condensation and drop simulation device which can be used for an external measuring device, and as shown in fig. 1, the multistage sulfur trioxide acid mist condensation and drop simulation device comprises a filling unit, a mixed heating unit, a vacuumizing unit and an auxiliary equipment unit, wherein:
the filling unit is used for adding gas corrosive gas SO into the device according to a rated proportion3Gas medium water vapor and proportioning gas medium N required by atmosphere condensation and precipitation2；
The mixed heating unit is used for filling the corrosive gas SO in the unit3Gas medium water vapor and proportioning gas medium N2Mixing and feeding the mixture into a reaction kettle at a certain speed for testing;
the vacuumizing unit is used for vacuumizing a device pipeline and a reaction kettle cavity after the experiment is finished, and discharging residual mixed gas from the device;
and the auxiliary equipment unit is used for realizing the driving and tail gas absorption of the whole gas drive device of the equipment.
The filling unit comprises SO3Filling unit, water vapor filling unit and N2Filling unit, SO3The filling unit comprises an electronic balance 6, the water vapor filling unit comprises a water vapor generator 5 and a one-way valve 2, N2The filling unit comprises a nitrogen gas cylinder 18, a water vapor filling unit and N2The filling units also each comprise an electric heater 3 and a pneumatic ball valve 4.
The mixed heating unit comprises a buffer tank 1, a reaction kettle 7, a discharge valve 19 and a stop valve 20, wherein the buffer tank adopts a 10L buffer tank, the reaction kettle 7 is provided with two reaction kettles, and the two reaction kettles 7 are connected in series.
The vacuumizing unit comprises a vacuum pump 16, a vacuum gauge 15, a quick connector 13 and a corrugated pipe 14.
The evacuation pressure of the vacuum pump 16 was 1.2KPa, and the rate was 40L/min.
The auxiliary equipment unit comprises a gas drive device and a tail gas absorption device, wherein the gas drive device comprises a filtering and pressure reducing valve 10 and an electromagnetic valve 12; the exhaust gas absorption device comprises a throttle valve 8, a cooler 9 and an exhaust gas processor 21.
When the device is used, the specific flow is as follows:
the buffer tank 1 is used for simulating the components of a gaseous medium before SO3 acid mist is condensed and reduced, and SO3, water vapor and proportioning nitrogen are required to form an effective proportion in the buffer tank 1, but condensation and reduction cannot occur, SO that all filling components are required to be quantitative, the temperature exceeds the dew point temperature of 160 ℃, and the filling process is carried out in three steps;
the first step is SO3Filling: s03Is the main corrosive medium in the reaction process, is in a liquid state at the temperature and the normal pressure, has strong corrosivity, and ensures the accuracy and the safety of the test S03Weighing by using an electronic balance 6, manually placing the weighed materials into a buffer tank 1, heating the buffer tank 1 to 80 ℃, and keeping the temperature for 2 hours to ensure that S0 is added3Completely gasifying sulfur, and heating to 160-260 deg.c to specific temperature according to S03In order to ensure that the addition of water vapour and N does not lead to excessive heating2After gas, S03The temperature of the buffer tank 1 is high enough not to react with water vapor and condense into acid mist;
the second step is steam filling: the water vapor comes from saturated water vapor emitted by the water vapor generator 5, after the water vapor occurs, the adding amount is controlled by the pneumatic ball valve 4, the control system of the pneumatic ball valve 4 is preset to control the adding amount of the water vapor, and the water vapor is generated by the steam generator and is saturated water vapor, the outlet temperature is only about 100 ℃, the water vapor is easy to react with SO3 to generate condensation drop, SO the water vapor is required to be heated to 160-260 ℃ before being injected into the buffer tank 1, and is changed into superheated water vapor;
the third step is steam heating: because the amount of the water vapor is less, in order to ensure that the water vapor is consumed as little as possible and is heated to a set temperature as fast as possible in the heating process, the electric heater is realized by adopting the following modes:
firstly, S03Filling the mixture with water vapor according to fixed components, N2The origin of the gas is 15MPa gas bottle gas, the gas is introduced into the mixing cavity after the pressure is regulated to 0.2MPa by a pressure reducing valve, N2The temperature is lower, an electric heater 3 is pressurized on the nitrogen pipeline for supplying N2Preheating to avoid N2The sulfuric acid gas and the water vapor react to form sulfuric acid which is gradually condensed out when the sulfuric acid gas is filled into the mixing cavity and the temperature of the mixing cavity is too low, the check valve 2 and the pneumatic ball valve 4 are arranged on the gas inlet pipeline, the pneumatic ball valve 4 is matched with the electromagnetic valve 12 for use, the automatic switching function can be realized, and the check valve 2 prevents gas from refluxing to corrode front-end components;
at the beginning of the experiment, S03Weighing by an electronic balance, and manually placing into a reaction kettle2Is automatically filled, wherein,
filling amount of water vapor: user input a (%), actual required output quality: ax20x0.8/100 ═ 0.16a (g);
S03filling amount of (2): user input B (%), actual required output quality: bx20x3.57 ÷ 1000000 ═ 7.14Bx 10-5 (g);
S03after the steam is added, the electric heater 3 and the buffer tank 1 are started for preheating, after the steam is heated to a set temperature, the pneumatic ball valve 4 between the buffer tank 1 and the steam heater 5 is opened, the steam heater 5 is started to charge steam into the buffer tank 1, and the steam is charged according to a set qualityWhen the amount is filled into the buffer tank 1, the pneumatic ball valve 4 between the buffer tank 1 and the steam heater 5 is closed, the steam generator 5 is closed, then stamping is started towards the inside of the buffer tank 1 until the internal pressure reaches 0.2MPa, the stop valve 20 is manually opened, mixed gas enters the two reaction kettles 7 to be tested in sequence, after the test is completed, waste gas after the test is processed through the throttle valve 8 and the cooler 9, and then the waste gas enters the waste gas processor 21 to complete waste gas treatment.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. Can be used to external measuring equipment's multistage sulfur trioxide acid mist congeals and falls analogue means, its characterized in that: including filling unit, mixed heating unit, evacuation unit and auxiliary assembly unit, wherein:
the filling unit is used for adding gas corrosive gas SO into the device according to a rated proportion3Gas medium water vapor and proportioning gas medium N required by atmosphere condensation and precipitation2；
The mixed heating unit is used for introducing corrosive gas SO in the filling unit3Gas medium water vapor and proportioning gas medium N2Mixing and feeding the mixture into a reaction kettle at a certain speed for testing;
the vacuumizing unit is used for vacuumizing a device pipeline and a reaction kettle cavity after the experiment is finished, and discharging residual mixed gas from the device;
and the auxiliary equipment unit is used for realizing the driving of the whole gas drive device of the equipment and tail gas absorption.
2. The multi-stage sulfur trioxide acid mist condensation-drop simulation device applicable to external measurement equipment as claimed in claim 1, which isIs characterized in that: the filling unit comprises SO3Filling unit, water vapor filling unit and N2Filling unit, said SO3The filling unit comprises an electronic balance (6), the water vapor filling unit comprises a water vapor generator (5) and a one-way valve (2), and the N is2The filling unit comprises a nitrogen gas bottle (18), a water vapor filling unit and N2The filling units also comprise the electric heater (3) and a pneumatic ball valve (4).
3. The multi-stage sulfur trioxide acid mist condensation and drop simulation device applicable to an external measuring device according to claim 1, wherein: the mixed heating unit comprises a buffer tank (1), two reaction kettles (7), a discharge valve (19) and a stop valve (20), wherein the buffer tank is a 10L buffer tank, and the two reaction kettles (7) are connected in series.
4. The multi-stage sulfur trioxide acid mist condensation and drop simulation device applicable to an external measuring device according to claim 1, wherein: the vacuumizing unit comprises a vacuum pump (16), a vacuum gauge (15), a quick joint (13) and a corrugated pipe (14).
5. The multi-stage sulfur trioxide acid mist condensation and drop simulation device applicable to an external measuring device according to claim 4, wherein: the vacuumizing pressure of the vacuum pump (16) is 1.2KPa, and the speed is 40L/min.
6. The multi-stage sulfur trioxide acid mist condensation and drop simulation device applicable to an external measuring device according to claim 1, wherein: the auxiliary equipment unit comprises a gas drive device and a tail gas absorption device, wherein the gas drive device comprises a filtering and pressure reducing valve (10) and an electromagnetic valve (12); the tail gas absorption device comprises a throttle valve (8), a cooler (9) and an exhaust gas processor (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010957874.1A CN114166729A (en) | 2020-09-11 | 2020-09-11 | Multistage sulfur trioxide acid mist condensation and precipitation simulation device capable of being used for external measurement equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010957874.1A CN114166729A (en) | 2020-09-11 | 2020-09-11 | Multistage sulfur trioxide acid mist condensation and precipitation simulation device capable of being used for external measurement equipment |
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| CN202010957874.1A Pending CN114166729A (en) | 2020-09-11 | 2020-09-11 | Multistage sulfur trioxide acid mist condensation and precipitation simulation device capable of being used for external measurement equipment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07103879A (en) * | 1993-10-07 | 1995-04-21 | Sumitomo Chem Co Ltd | Method and apparatus for corrosion test |
| CN104614308A (en) * | 2015-02-26 | 2015-05-13 | 中国特种设备检测研究院 | Experimental device for simulating sulfuric acid dew point corrosion |
| CN109916807A (en) * | 2019-03-28 | 2019-06-21 | 长沙理工大学 | A kind of simulation gas generating processes for studying corrosion of sulfuric acid at dew point |
| CN209727723U (en) * | 2018-10-11 | 2019-12-03 | 海德利森(天津)检测设备有限公司 | Metal erosion experimental provision in the case of a kind of sulfuric acid leak source |
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2020
- 2020-09-11 CN CN202010957874.1A patent/CN114166729A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07103879A (en) * | 1993-10-07 | 1995-04-21 | Sumitomo Chem Co Ltd | Method and apparatus for corrosion test |
| CN104614308A (en) * | 2015-02-26 | 2015-05-13 | 中国特种设备检测研究院 | Experimental device for simulating sulfuric acid dew point corrosion |
| CN209727723U (en) * | 2018-10-11 | 2019-12-03 | 海德利森(天津)检测设备有限公司 | Metal erosion experimental provision in the case of a kind of sulfuric acid leak source |
| CN109916807A (en) * | 2019-03-28 | 2019-06-21 | 长沙理工大学 | A kind of simulation gas generating processes for studying corrosion of sulfuric acid at dew point |
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