CN110108630B - Test method for simulating corrosion of oil product containing organic matters to petrochemical equipment - Google Patents
Test method for simulating corrosion of oil product containing organic matters to petrochemical equipment Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 101
- 230000007797 corrosion Effects 0.000 title claims abstract description 101
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 58
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 47
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011593 sulfur Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000460 chlorine Substances 0.000 claims abstract description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 49
- 239000012535 impurity Substances 0.000 claims description 16
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 238000005399 mechanical ventilation Methods 0.000 claims description 9
- -1 sulfur ion Chemical class 0.000 claims description 9
- WQAQPCDUOCURKW-UHFFFAOYSA-N butanethiol Chemical compound CCCCS WQAQPCDUOCURKW-UHFFFAOYSA-N 0.000 claims description 8
- 239000003209 petroleum derivative Substances 0.000 claims description 7
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- 239000002390 adhesive tape Substances 0.000 claims description 6
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
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- 238000004519 manufacturing process Methods 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
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- 229910052799 carbon Inorganic materials 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
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- 230000008676 import Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 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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Abstract
The invention relates to the technical field of corrosion test methods of metal materials of petrochemical equipment, in particular to a test method for simulating corrosion of an oil product containing organic matters to the petrochemical equipment. Comprises 1) simulating the corrosive environment of the sulfur petrochemical equipment; 2) Preparing a sample; 3) Simulation of the corrosion state of sulfur petrochemical equipment; 4) Simulating corrosion test of a corrosive medium environment sample; 5) And (3) after the test in the step (4) is finished, removing corrosion products corroded on the surface of the sample by using a rust remover, measuring the lost mass of the sample, and calculating the corrosion rate by using a depth method. The corrosion of organic active sulfur components in sulfur-containing oil products to materials is effectively simulated, factors including organic chlorine, total acidity of the oil products, water content and the like can be considered, the influence rule of multifactor corrosion on the sulfur-related petrochemical equipment is analyzed through orthogonal design, and a more effective corrosion research means is provided for the corrosion research of the petrochemical equipment under the process conditions in the sulfur-related corrosion field.
Description
Technical Field
The invention relates to the technical field of corrosion test methods of metal materials of petrochemical equipment, in particular to a test method for simulating corrosion of an oil product containing organic matters to the petrochemical equipment.
Background
In recent years, the development speed of the petroleum industry is continuously increased, the consumption of crude oil is continuously increased, the number of storage tanks is continuously increased, the domestic crude oil can not meet the requirements of domestic markets, and a plurality of enterprises start to import foreign crude oil. However, the crude oil extracted from abroad gradually shows the variation trend of high acid, high sulfur and high water content, which aggravates the corrosion of the oil tank used in the domestic petrochemical industry.
In the process of storing and transporting various storage tanks of petrochemical systems in China, the service life is often shortened due to corrosion, and the storage tanks are scrapped after being put into service for one year for serious people and cannot be used. Corrosion not only shortens the normal service life of the oil tank, but also causes sudden major fire and explosion accidents by corrosion products. Therefore, how to solve the safety problem caused by sulfur corrosion has become an important issue facing the petrochemical industry.
At present, the research and cognition of sulfur corrosion caused by sulfur-containing oil products in the petrochemical industry is not deep, and a systematic research method is not available. Aiming at the corrosion prevention measures of petrochemical equipment, most of single-factor or double-factor corrosion researches are carried out, for example, chinese patent publication number 201310391252 and the invention name of 'a method for testing the deposition sulfur corrosion of oil well pipe materials and a clamp for testing the same' introduce a sulfur corrosion test method, and the sulfur corrosion test container is suitable for the corrosion test researches for measuring the weight loss of a sample and the depth of a local corrosion pit and simulating the corrosion behavior of the materials under the action of deposited sulfur.
Although these methods provide many convenience for sulfur-related corrosion research in the petrochemical industry, in the test, the simulated corrosive medium environment is generally an aqueous solution containing a corrosive medium, and the aqueous solution is greatly different from the oil product under actual working conditions in terms of physical and chemical characteristics; in the prior test method, sulfur powder is directly added into the corrosive solution, but elemental sulfur is not dissolved in water, and sulfur cannot be fully mixed with the corrosive solution; in the crude oil processing process, corrosion is not only corrosion of sulfur element to materials, but also synergistic effects of other impurities contained in crude oil, such as Cl -、H2 O and the like, to materials are often considered to be not comprehensive enough; the interaction of all factors in the corrosion process and the influence degree of all factors on the corrosion process cannot be effectively studied and understood; the test equipment cannot control the harmful gases generated and volatilized in the test process.
For the above reasons, if the existing sulfur-related corrosion research test method is still used, the corrosion behavior of the material of the sulfur-related petrochemical equipment cannot be effectively simulated and researched, so that the reliability of the corrosion test of the sulfur-containing oil product on the material is lacking.
Disclosure of Invention
Aiming at the defects, the invention provides a test method for simulating corrosion of an oil product containing organic matters to petrochemical equipment, which can truly and effectively develop the change rule of corrosion behavior of the sulfur-related petrochemical equipment under the influence of sulfur-containing oil products and other multiple impurities and evaluate the corrosion resistance of metal materials.
The invention is realized by adopting the following technical scheme:
a test method for simulating corrosion of an oil product containing organic matters to petrochemical equipment comprises the following steps:
1) Simulation of the corrosion environment of sulfur petrochemical equipment;
1-1) selecting an oil product in a process link to be tested in a test, and obtaining the main components and the element proportion of each impurity component of the oil product through a gas phase mass spectrometer;
1-2) designing test levels and factors by designing orthogonal test tables;
1-3) simulating sulfur or sulfur ion impurities contained in an oil product, wherein analytically pure butanethiol or other organic sulfides which are dissolved in organic matters and contain active sulfur are selected, the mass of the butanethiol to be added in a test is determined according to the sulfur-containing mass ratio of the oil product, and the total concentration range of sulfur of an oil product solution in a process link to be tested after the butanethiol impurities are added is 0-20000mg/L;
1-4) simulating chloride ion impurities contained in an oil product, wherein analytically pure carbon tetrachloride or other chlorides dissolved in organic matters are selected, and the mass of carbon tetrachloride to be added in a test is determined according to the mass ratio of chlorine to the oil product, wherein the total concentration range of chloride ions of an oil product solution in a process link to be tested after the carbon tetrachloride impurities are added is 0-22000mg/L;
1-5) adding the butanethiol and the carbon tetrachloride determined in the steps (1-3) and (1-4) into the oil product required to be subjected to corrosion simulation test, and uniformly stirring to mix impurities with the oil product;
2) Sample preparation
2-1) Preparing a test specimen, namely a metal hanger described later; selecting materials adopted by the manufacturing of the sulfur-related petrochemical equipment or more advanced novel materials; such as low carbon steel, or austenitic stainless steel, glass reinforced plastic (fiber reinforced plastic);
2-1-1) is used for simulating that when the sulfopetrifaction equipment is in a tensile stress or a shear stress state, a standard specification sample is processed into a bent shape, and the middle part of the hanging piece is selected to be bent, so that five bending angles are provided; punching holes at two ends of the hanging piece, and fixing the two ends by using ceramic screws so that constant stress exists on the hanging piece to a certain extent;
2-1-2) is used for simulating the state of residual stress of welding seams of the sulfur-related petrochemical equipment, selecting a hanging piece processed after welding, wherein the arrangement direction of the welding seams of the hanging piece is longitudinal or transverse;
3) Simulation of the corrosion state of sulfur petrochemical equipment;
Placing a corrosion medium container for containing a corrosion environment simulation medium into a constant-temperature oil bath pot, adjusting the temperature in the constant-temperature oil bath pot according to the working condition of the oil to be tested, and selecting other types of special temperature and pressure devices if special pressure conditions are required to be simulated, for example, adopting a high-temperature high-pressure dynamic corrosion instrument;
4) Simulating corrosion test of a corrosive medium environment sample;
5) And (3) after the test in the step (4) is finished, removing corrosion products corroded on the surface of the sample by using a rust remover, measuring the lost mass of the sample, and calculating the corrosion rate by using a depth method.
Further, the orthogonal test table is designed in the step (1-2), and the designed primary interaction among factors is also included; and determining the mass of sulfur and chlorine impurities to be added and controlled in the test according to the mass ratio of sulfur and chlorine in the oil product.
Further, in the step (2-1-1), after the test sample affected by stress is bent, holes are drilled at two ends of the test sample, and then the test sample is fixed by ceramic screws through the holes and is screwed by nuts; and then pressure is applied to the two ends of the sample so as to apply a certain degree of constant stress to the sample, so that the sample is in a certain stress state.
Further, in the step (2-1-1), the five bending angles are 50 °, 60 °, 70 °, 80 ° and 90 °.
Further, in the step (2-1-1), the ceramic screw is made of a corrosion-resistant high-temperature silicon nitride ceramic material.
Further, the welding groove angle of the test sample in the step (2-1-2) is 45 degrees, 60 degrees or 90 degrees, and the weld joint test sample is subjected to heat treatment or not subjected to heat treatment according to experiments to eliminate residual stress.
Further, the top of the corrosive medium container in the step (3) is sealed by adopting an elastic rubber plug, and a plurality of through holes are formed in the elastic rubber plug according to the number of placed samples; the hollow glass tube passes through the through hole and is fixed in the through hole, and the external diameter of the hollow glass tube is matched with the internal diameter of the through hole.
After a fixing rope for fixing a sample passes through a small hole above the sample, two ends of the tail end of the redundant fixing rope pass through a hollow glass tube fixed in the through hole, a flexible rubber tube is sleeved on the upper part of the hollow glass tube, cotton is filled in the rubber tube, and the middle part of the rubber tube is clamped by a water stop clamp for sealing; finally, a polytetrafluoroethylene adhesive tape is used for wrapping and sealing the gap of the corrosive medium container.
The number of the through holes is less than or equal to 4.
The diameter of the through hole is 5mm-8mm.
The number of samples placed in the corrosive medium container is not more than 4.
Furthermore, the fixed rope is made of a high-temperature-resistant corrosion-resistant polytetrafluoroethylene material, so that the condition that the rope is broken or damaged by a corrosion environment in the corrosion process is avoided, and the height of the sample in the container can be controlled through the rope made of the plastic polytetrafluoroethylene material, so that the sample can be positioned in a liquid phase, a gas-liquid interface and a gas phase environment through adjustment.
Furthermore, the preparation of the simulated corrosion environment medium and the corrosion test of the simulated corrosion medium environment sample are both in the mechanical ventilation cabinet, and the inner wall of the mechanical ventilation cabinet is provided with a three-hole socket and a two-hole socket so as to supply power in the test.
The beneficial effects of the invention are as follows: the test method for simulating corrosion of the petroleum product containing the organic matters to the petrochemical equipment can effectively simulate corrosion of organic active sulfur components in the sulfur-containing petroleum product to materials, factors including organic chlorine, total acidity of the petroleum product, water content and the like can be considered, the influence rule of the sulfur-containing petrochemical equipment to multi-factor corrosion can be analyzed through orthogonal design, harmful gases generated and volatilized in the test process can be effectively controlled, and a more effective corrosion research means is provided for corrosion research of the petrochemical equipment under the process conditions in the sulfur-containing corrosion field.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a testing apparatus of the present invention;
FIG. 2 is a schematic view of an apparatus 1 for limiting elastic deformation of a metal hanger plate in a tensile or shear state according to the present invention;
FIG. 3 is a sample of the present invention, a schematic metal hanger 1 (for simulating a sulfoing device in a tensile or shear state);
FIG. 4 is a schematic view of a sample of the present invention, a metal hanger apparatus, FIG. 2 (for simulating the presence of weld residual stress in a portion of a petrochemical plant involved in sulfur)
In the figure: 1. the mechanical ventilation cabinet comprises a mechanical ventilation cabinet body 2, a flexible rubber tube 3, a fixed rope, a water stop clamp 4, a hollow glass tube 5, a top plug 6, a sealing adhesive tape 7, a corrosion medium container 8, a corrosion medium container 9, a sample 10, a heating device 11, a ceramic nut 12, a ceramic screw 13, a bending sample 14, a welding seam sample 14-1 and a welding seam.
Detailed Description
The process according to the invention and its use are further illustrated in the following by means of the accompanying drawings in combination with specific examples.
Referring to fig. 1 to 4, a testing device for simulating corrosion of petroleum products containing organic matters to petrochemical equipment comprises a mechanical ventilation cabinet 1, heating equipment 10, a corrosion medium container 8 and a sample 9; the heating device 10 is arranged in the middle of the inside of the mechanical ventilation cabinet 1; a corrosive medium container 8 is arranged in the heating equipment 10; the corrosion medium container 8 is hollow, the top of the corrosion medium container 8 is sealed by a top plug 6, and a plurality of through holes are formed in the top plug 6; the hollow glass tube 5 passes through the through hole and is relatively fixed in the through hole, and the outer diameter of the hollow glass tube 5 is matched with the inner diameter of the through hole.
The sample 9 is hung in the corrosive medium container 8 through the fixing rope 3, and the redundant part of the fixing rope 3 passes through the hollow glass tube 5 in the through hole on the top plug 6; the upper part of the hollow glass tube 5 is sleeved with a flexible rubber tube 2, cotton is filled in the flexible rubber tube 2, and the middle part of the flexible rubber tube 2 is clamped by a water stop clamp 4 for sealing; the gap at the intersection of the upper part of the corrosive medium container 8 and the top plug 6 is sealed by an adhesive tape.
The sample 9 includes a first sample and a second sample.
Referring to fig. 2 and 3, a first sample, namely, a bending sample 13, is used for simulating that a sulfochemical device is in a tensile stress or shear stress state, a standard strip-shaped hanging piece is processed into a bending shape, specifically, the middle part of the hanging piece is bent, the bending angle comprises five bending angles, two ends of the bent hanging piece are perforated, and two ends of the bent hanging piece are fixed by a ceramic screw 12 and a ceramic nut 11, so that a certain degree of constant stress exists on the bent hanging piece.
Referring to fig. 4, a second sample, namely a weld sample 14, is used for simulating the existence of residual stress of a weld in a portion of a petrochemical equipment involved, and a hanging piece processed after welding is adopted, wherein the arrangement direction of the weld 14-1 of the hanging piece is longitudinal or transverse.
The adhesive tape is made of polytetrafluoroethylene.
The top plug 6 adopts an elastic rubber plug.
The inner wall of the mechanical ventilation cabinet 1 is provided with a three-hole socket and a two-hole socket.
The heating device 10 adopts a constant temperature oil bath.
The mechanical fume hood 1 adopts a commercially available rotary exhaust fume hood.
Example 1
The experimental material using 316 stainless steel as the sample comprises the following main components: 0.08% C,2.00% Mo,2.00% Mn,16.00% Cr,12.00% Ni, fe balance. The external dimension (l×b×h) is processed, mm:50×25×2. The middle hole d=4 mm, 5mm from the upper side. Acetone was ground with 800 mesh paper and then washed, and then the mixture was weighed and recorded by an electronic balance to an accuracy of 0.0001g.
And 4 factor 2 level 1 level interactive test is selected, and an orthogonal test factor level table and an orthogonal test design table are as follows:
TABLE 1 level of orthogonal test factors
TABLE 2 orthogonal experimental design table
The simulated solution was prepared as described above. The sample is put into a corrosive medium container shown in figure 1, and the container is sealed by polytetrafluoroethylene adhesive tape and a water stop clamp, so that the corrosive medium is prevented from leaking after being heated. The corrosive medium container is put into a constant temperature oil bath, methyl silicone grease is selected as a heating medium of the constant temperature oil bath, the temperature is set to 90 ℃, the temperature fluctuation in the constant temperature oil bath is not more than +/-1 ℃, and under the condition, the test time is 21 days. After the test, taking out the sample for performing an X-ray diffraction experiment, and analyzing mass fractions of elements and corrosion products after corrosion; the rust remover is used for removing corrosion products, and the corrosion rate is calculated by weighing; and carrying out a scanning electron microscope test on the sample from which the corrosion product is removed to obtain the corrosion morphology of the sample after corrosion.
Example 2
The experimental material using Q235 carbon steel as a sample comprises the following main components: 0.22% C,0.50% S,0.65% Mn,0.30% Si,0.05% P, the balance being Fe. The external dimension (l×b×h) is processed, mm:72.4×11.5×2. The intermediate hole d=4.2 mm, 5mm from the upper and lower sides. Sequentially polishing with 400-mesh and 800-mesh frosted paper, cleaning with acetone, and weighing and recording with an electronic balance.
2 Factor 3 level 1 level interactive test is selected, and an orthogonal test factor level table and an orthogonal test design table are as follows:
TABLE 3 level of orthogonal test factors
TABLE 4 orthogonal experimental design table
The simulation solution is prepared according to the method, the sample is placed into a corrosive medium container shown in figure 1, and the corrosive medium container is sealed by a polytetrafluoroethylene adhesive tape and a water stop clamp, so that substances are prevented from leaking after the corrosive medium is heated. The corrosive medium container is put into a constant temperature oil bath, glycerin is selected as a heating medium of the constant temperature oil bath, the temperature is respectively set to 80 ℃, 90 ℃ and 100 ℃, the temperature fluctuation in the constant temperature oil bath is not more than +/-1 ℃, and under the condition, the test time is 28 days. After the test, taking out the sample for performing an X-ray diffraction experiment, and analyzing mass fractions of elements and corrosion products after corrosion; the rust remover is used for removing corrosion products, and the corrosion rate is calculated by weighing; and carrying out a scanning electron microscope test on the sample from which the corrosion product is removed to obtain the corrosion morphology of the sample after corrosion.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated that modifications may be made in the art without departing from the principles of the invention, and such modifications are intended to be included within the scope of the invention.
Claims (8)
1. A test method for simulating corrosion of an oil product containing organic matter to petrochemical equipment, comprising the steps of:
simulation of the corrosion environment of sulfur petrochemical equipment;
1-1) selecting an oil product in a process link to be tested in a test, and obtaining the main components and the element proportion of each impurity component of the oil product through a gas phase mass spectrometer;
1-2) designing test levels and factors by designing orthogonal test tables;
1-3) simulating sulfur or sulfur ion impurities contained in an oil product, wherein analytically pure butanethiol is selected, the mass of the butanethiol to be added in a test is determined according to the mass ratio of sulfur in the oil product, and the total concentration range of sulfur in an oil product solution in a process link to be tested after the butanethiol impurities are added is 0-20000mg/L;
1-4) simulating chloride ion impurities contained in an oil product, selecting analytically pure carbon tetrachloride, and determining the mass of carbon tetrachloride to be added in a test according to the mass ratio of chlorine to the oil product, wherein the total concentration range of the chloride ions of an oil product solution in a process link to be tested after the carbon tetrachloride impurities are added is 0-22000mg/L;
1-5) adding the butanethiol and the carbon tetrachloride determined in the steps 1-3) and 1-4) into the oil product to be subjected to corrosion simulation test, and uniformly stirring to mix impurities with the oil product;
2) Sample preparation
2-1) Preparing a test specimen; manufacturing the sample by using a sulfopetrifaction device, wherein the sample is a metal hanging sheet;
2-1-1) is used for simulating that when the sulfopetrifaction equipment is in a tensile stress or a shear stress state, a standard specification sample is processed into a bent shape, and the middle part of the metal hanger is selected to be bent, so that five bending angles are provided; the five bending angles are 50 degrees, 60 degrees, 70 degrees, 80 degrees and 90 degrees, and the two ends of the metal hanging sheet are perforated and fixed by ceramic screws, so that constant stress exists on the metal hanging sheet to a certain extent;
2-1-2) is used for simulating the residual stress state of welding seams of the petrochemical equipment, selecting the metal hanging sheets processed after welding, wherein the arrangement direction of the welding seams of the metal hanging sheets is longitudinal or transverse; the bevel angle of the welding of the sample is 45 degrees, 60 degrees or 90 degrees;
3) Simulation of the corrosion state of sulfur petrochemical equipment; placing a corrosion medium container for containing a corrosion environment simulation medium into a constant-temperature oil bath pot, adjusting the temperature in the constant-temperature oil bath pot according to the working condition of the oil product to be tested, and adopting a high-temperature high-pressure dynamic corrosion instrument if a special pressure condition is required to be simulated;
4) Simulating corrosion test of a corrosive medium environment sample;
5) And (3) after the test in the step (4) is finished, removing corrosion products corroded on the surface of the sample by using a rust remover, measuring the lost mass of the sample, and calculating the corrosion rate by using a depth method.
2. The method of claim 1, wherein the orthogonal test chart is designed in step 1-2) and further comprises a first order interaction between the designed factors; and determining the mass of sulfur and chlorine impurities to be added and controlled in the test according to the mass ratio of sulfur and chlorine in the oil product.
3. The method for simulating corrosion of petroleum products containing organic matters to petrochemical equipment according to claim 1, wherein in the step 2-1-1), after bending the sample affected by stress, holes are formed at two ends of the sample, the sample is fixed by ceramic screws through the holes, and nuts are used for tightening; and then pressure is applied to the two ends of the sample so as to apply a certain degree of constant stress to the sample, so that the sample is in a certain stress state.
4. The method for simulating corrosion of petroleum products containing organic substances to petrochemical equipment according to claim 1, wherein in said step 2-1-1), said ceramic screw is made of a silicon nitride ceramic material with high corrosion resistance and high temperature.
5. The test method for simulating corrosion of oil products containing organic matters to petrochemical equipment according to claim 1, wherein the corrosion medium container in step 3) is sealed at the top by an elastic rubber plug, and a plurality of through holes are formed in the elastic rubber plug according to the number of placed samples; the hollow glass tube passes through the through hole and is fixed in the through hole, and the external diameter of the hollow glass tube is matched with the internal diameter of the through hole.
6. The method for simulating corrosion of an oil product containing organic matter to petrochemical equipment according to claim 5, wherein the number of through holes is 4 or less, and the number of samples placed in the corrosive medium container is not more than 4.
7. The method for simulating corrosion of petroleum products containing organic substances to petrochemical equipment according to claim 5 or 6, wherein after the fixing rope for fixing the sample passes through the small hole above the sample, both ends of the tail end of the redundant fixing rope pass through the hollow glass tube fixed in the through hole, the upper part of the hollow glass tube is sleeved with a flexible rubber tube, cotton is filled in the rubber tube, and the middle part of the rubber tube is clamped by a water stop clamp for sealing; finally, a polytetrafluoroethylene adhesive tape is used for wrapping and sealing the gap of the corrosive medium container.
8. The method for simulating corrosion of an oil product containing organic matter to petrochemical equipment according to claim 1, wherein the preparation of the simulated corrosive environment medium and the test of the sample corrosion of the simulated corrosive environment medium are both in a mechanical ventilation cabinet, and three-hole and two-hole sockets are arranged on the inner wall of the mechanical ventilation cabinet so as to supply power in the test.
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