CN201984019U - High-temperature and high-pressure loop circuit spraying corrosion simulation and electrochemistry testing experimental device - Google Patents

High-temperature and high-pressure loop circuit spraying corrosion simulation and electrochemistry testing experimental device Download PDF

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Publication number
CN201984019U
CN201984019U CN2010206969957U CN201020696995U CN201984019U CN 201984019 U CN201984019 U CN 201984019U CN 2010206969957 U CN2010206969957 U CN 2010206969957U CN 201020696995 U CN201020696995 U CN 201020696995U CN 201984019 U CN201984019 U CN 201984019U
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CN
China
Prior art keywords
temperature
autoclave
pressure
closed circuit
pipeline
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CN2010206969957U
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Chinese (zh)
Inventor
柳伟
俞曼丽
李新仲
常炜
郭宏
郑利军
路民旭
王春升
王建丰
樊学华
蔡峰
王振国
刘太元
Original Assignee
中国海洋石油总公司
中海石油研究中心
北京科技大学
北京安科管道工程科技有限公司
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Priority to CN201010194447.9 priority Critical
Priority to CN201010194447A priority patent/CN101865816A/en
Application filed by 中国海洋石油总公司, 中海石油研究中心, 北京科技大学, 北京安科管道工程科技有限公司 filed Critical 中国海洋石油总公司
Priority to CN2010206969957U priority patent/CN201984019U/en
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Publication of CN201984019U publication Critical patent/CN201984019U/en

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Abstract

The utility model relates to a high-temperature and high-pressure loop circuit spraying corrosion simulation and electrochemistry testing experimental device, which belongs to the field of electrochemistry and is particularly suitable for simulating the washing and corrosion condition existing at complicated components such as elbows and tees in pipelines for collecting and conveying petroleum, natural gas and the like, so as to conduct the washing and the corrosion simulation test for pipeline components used for conveying high-temperature and high-pressure multiple-phase fluid, and the in-situ electrochemistry signal testing on the high-temperature and high-pressure fluid washing and corrosion in case of washing. The device comprises an autoclave, a heating and thermal insulation system, a loop circuit water inlet, a three-electrode system, a pipeline switching over flange, a circulation loop, a high-temperature and high-pressure liquid flow meter, a control valve, a liquid discharge opening, a vortex pump, a circulation cooling system, a temperature measuring system, a pipe connection flange, a loop circuit water outlet, a nozzle, a sample clamp, a control box, a signal conduction path, an externally-connected electrochemical workstation and an externally-connected high-pressure gas cylinder. The device can better simulate the washing and corrosion condition of a fluid medium in an oil gas pipeline, and test the electrochemistry signals of the working electrode under the high speed jet condition, such as the polarized curve and the alternating current impedance, thereby having importance significance in the study on the washing and corrosion behaviors, laws and mechanisms of the high-temperature and high-pressure fluid.

Description

A kind of high-temperature high-pressure loop spray corrosion simulation and electro-chemical test experimental provision
Technical field
The utility model belongs to electrochemical field, relates to the experimental provision of erosion corrosion behavior, rule and the mechanism research usefulness of a kind of high temperature pressure corrosion medium metal material under the high velocity jet working condition.Be applicable to the research of complex component erosion corrosion behaviors in the high temperature and high pressure flow body medium such as channel bend, threeway, be particularly useful for simulating the erosion corrosion situations that complex component occurred such as elbow in collections such as petroleum gas and the conveyance conduit, threeway, carry the simulated experiment of High Temperature High Pressure heterogeneous fluid conduit component erosion corrosion, and the electrochemical in-situ signal testing that washes away the high-temperature, high pressure fluid erosion corrosion under the condition.
Background technology
The high-temperature, high pressure fluid erosion corrosion is that a kind of galvanic corrosion and mechanical erosion interact and the material failure phenomenon that causes, and for example the many erosion corrosions based on high-temperature, high pressure fluid of complex component such as the elbow of pipeline, threeway were lost efficacy in oil and gas industry collection and the course of conveying.Containing CO 2In the oil gas transmission Deng sour gas,, easily form turbulent flow at complex component places such as elbow, threeways, produce very big shearing stress at inner-walls of duct and quickened the damage at pipe fitting position greatly because the flow velocity of internal pipe pressure, temperature and medium is higher.Carrying out the High Temperature High Pressure erosion-corrosion experiment is the important means of corrosion stability, erosion behavior and the mechanism of material under the evaluation flow at high speed ambient condition.Therefore, the high-temperature, high pressure fluid erosion-corrosion experiment that can simulate under the physical condition and the device that carries out the electrochemical in-situ corrosion experiment must be arranged.But because under the injection conditions of High Temperature High Pressure and high-velocity fluid, bearing capacity requirement and structures such as dynamic duty electrode and contrast electrode to pipe connecting part, volute pump, flowmeter and by-pass valve control all have very high requirement, and are not easy to realize the measurement of electrochemical signals.Usually, in normal temperature and pressure conditions, carry out erosion-corrosion experiment, and carry out the electrochemical in-situ test experiments of normal temperature and pressure.Therefore, during erosion corrosion mechanism under the research trends condition, owing to the device that lacks High Temperature High Pressure erosion-corrosion experiment device and measure the high-temperature and high pressure electrochemistry signal influences further investigation to High Temperature High Pressure erosion corrosion behavior, rule and mechanism.
Summary of the invention
At the problems referred to above, the purpose of this utility model is to provide high-temperature, high pressure fluid erosion corrosion simulated experiment and electrochemical in-situ experimental apparatus for testing, carry high-temperature, high pressure fluid for the research conduit component and cause the corrosion resisting property of behavior, rule, mechanism and the evaluation material of erosion corrosion, a cover simulation High Temperature High Pressure erosion-corrosion experiment and an electro-chemical test experimental provision is provided.This experimental provision can be simulated conduit component caused erosion corrosion phenomenon in carrying the high-temperature high-pressure medium flow liquid process easily.
A kind of high-temperature high-pressure loop spray corrosion simulation and electro-chemical test experimental provision is characterized in that: this device comprises autoclave 31, heat tracing system, loop water inlet 5, three-electrode system, pipeline switching flange 8, closed circuit 10, high-temperature high-pressure liquid flowmeter body 11, by-pass valve control, leakage fluid dram 14, volute pump 15, circulating cooling system 17, temp measuring system, pipeline joint flange 20, loop water delivering orifice 22, shower nozzle 25, specimen holder 33, control box, signal transduction pathway, external electrochemical workstation and external gas cylinder; Autoclave 31 is made of draft tube 1, autoclave loam cake 2, autoclave body 4, autoclave lower cover 6, viton seal ring 1, pressure transducer 26, tensimeter 27, safety valve 28 and gas outlet 30; The heat tracing system is made of autoclave heating and heat-insulating device 3 and closed circuit heating and heat-insulating device 46; Three-electrode system is made of auxiliary electrode 7, working electrode copper rod 9 and High Temperature High Pressure Ag/AgCl contrast electrode 21; By-pass valve control comprises flowmeter valve 12 and bypass valve 13; Circulating cooling system 17 is made of circulating cooling system water delivering orifice 16 and circulating cooling system water inlet 19; Temp measuring system is made of temperature sensor 29 in closed circuit temperature sensor 18 and the autoclave; Control box is made of temperature in the kettle control instrument, loop temperature control instrument, circulating cooling system gauge tap and volute pump gauge tap; Signal transduction pathway is made of the lead between electrochemical workstation and three electrodes; The wireway of external gas cylinder and the draft tube of autoclave 1 are by being threaded.Autoclave lower cover 6 is connected with autoclave body 4 by bolt, and utilizes viton seal ring one 23 sealings.The water inlet 22 of closed circuit 10 links to each other with autoclave lower cover 6 by welding, and lower end use pipeline joint flange 20, makes things convenient for the dismounting of loop and autoclave.The circulating cooling system 17 inner recirculated cooling waters (refrigerator circulation) that feed uniform temperature, eliminate the heat that the high temperature and high pressure flow body medium produces at shower nozzle 25 places, and keeping the stability of total system temperature in conjunction with loop heat tracing system (other positions that do not comprise cooling system in Fig. 1 closed circuit 10) and autoclave heat tracing system 3, autoclave 31 and closed circuit 10 internal liquid temperature are measured by temperature sensor in the autoclave 29 and closed circuit temperature sensor 18 respectively.The water side of closed circuit 10 changes pipe diameter by pipeline switching flange 8, is convenient to link to each other with autoclave 31, and water delivering orifice 5 is connected with autoclave lower cover 6 by the bite type web member, guarantees impermeability.Control box links to each other with autoclave 31, loop heat tracing system, circulating cooling system 17 and volute pump 15 by lead.Fluid media (medium) in the device circulates by volute pump 15, and utilizes flowmeter valve 12 and bypass valve 13 to regulate the flow velocity of shower nozzle 25 place's media, shows the flow at shower nozzle 25 places by high-temperature high-pressure liquid flowmeter body 11.The device pressure inside shows that by pressure transducer 23 and tensimeter 24 when whole device pressure surpasses predetermined value, can regulate by gas outlet 30, in case overrate, safety valve 27 will be opened automatically, guarantee the security of total system.Liquid in the whole device is by leakage fluid dram 14 emptyings.
The electro-chemical test device is by auxiliary electrode 7, working electrode copper rod 9, and High Temperature High Pressure Ag/AgCl contrast electrode 21, signal transduction pathway and external electrochemical workstation constitute.Auxiliary electrode 7 and High Temperature High Pressure Ag/AgCl contrast electrode 21 utilize with autoclave lower cover 6 and are threaded.The concrete structure of working electrode copper rod 9 as shown in Figure 2, the poly-tetrafluoro anchor clamps 33 that poly-tetrafluoro bolt 32 will stud with sample 24 are fixed on the jig pallet 34, and utilize poly-polytetrafluoroethylsealed sealed circle 2 36 to seal, avoid internal work electrode copper rod 9 to contact with liquid medium, jig pallet 34 is fixed on the basetray 39 by tray supporter 38, tray supporter 38 utilizes with basetray 39 and is threaded, and utilize tray supporter 38 will be with the poly-tetrafluoro sleeve 40 of awl to compress sealing with copper rod 9, basetray 39 and autoclave lower cover 6 guarantee its concentricity by being weldingly connected.Sample 24 contacts with copper rod 9 by copper spring 35, guarantees that both contact well.Cylinder copper nut 37 is connected with copper rod 9, guarantees that copper rod bears higher pressure in vertical direction, and cylinder copper nut 37 utilizes poly-Tetrafluoro spacer 2 45 to avoid contacting with jig pallet 34.Copper rod 9 utilizes poly-tetrafluoro sleeve 40 of band awl and poly-tetrafluoro circular cone 41 to guarantee the sealing of autoclave lower cover 6.Poly-tetrafluoro circular cone 41 utilizes poly-Tetrafluoro spacer 1 and copper nut one 42 lockings, copper rod 9 utilizes copper nut 2 43 to link to each other with the working electrode end of electrochemical workstation, and auxiliary electrode 7 links to each other with the corresponding interface of electrochemical workstation respectively than electrode 21 with the High Temperature High Pressure difference.The autoclave volume is 8L, and whole device volume is 12L, and 180 ℃ of maximum operating temperatures, maximum working pressure (MWP) are 2MPa, and the maximum spout jet velocity is 40m/s.
Advantage of the present utility model is to simulate the high-temperature, high pressure fluid erosion-corrosion experiment, and the electrochemical in-situ signal (linear polarization, polarization curve and electrochemical impedance etc.) of monitoring electrode under high-temperature, high pressure fluid injection situation, and can provide erosion corrosion weightless and morphology observation sample, can be used to carry out the research of erosion corrosion behavior, rule and the mechanism of high temperature and high pressure flow body medium.
Description of drawings
Fig. 1 is a structural representation of the present utility model, wherein, and the 1-draft tube, 2-autoclave loam cake, 3-autoclave heating and heat-insulating device, 4-autoclave body, 5-loop water inlet, 6-autoclave lower cover, 7-auxiliary electrode, 8-pipeline switching flange, 9-working electrode copper rod, 10-closed circuit, 11-high-temperature high-pressure liquid flowmeter body, 12-flowmeter valve, 13-bypass valve, the 14-leakage fluid dram, 15-volute pump, 16-circulating cooling system water delivering orifice, the 17-circulating cooling system, 18-closed circuit temperature sensor, 19-circulating cooling system water inlet, 20-pipeline joint flange, 21-High Temperature High Pressure contrast electrode, 22-loop water delivering orifice, the 23-viton seal ring, 24-sample, 25-shower nozzle, the 26-pressure transducer, 27-tensimeter, 28-safety valve, temperature sensor in the 29-autoclave, the 30-gas outlet, 31-autoclave, 46-closed circuit heating and heat-insulating device;
Fig. 2 is the structural representation in A district among the utility model Fig. 1, and wherein, 32-gathers the tetrafluoro bolt, the 33-specimen holder, 34-jig pallet, 35-copper spring, 36-viton seal ring two, 37-cylinder copper nut, 38-tray supporter, the 39-basetray, the poly-tetrafluoro sleeve of 40-band awl, 41-gathers the tetrafluoro circular cone, 42-copper nut one, 43-copper nut two, 44-gathers Tetrafluoro spacer one, and 45-gathers Tetrafluoro spacer two.
Embodiment
With reference to Fig. 1,2, this is high-temperature, high pressure fluid erosion corrosion simulated experiment and the electro-chemical test experimental provision that provides according to technique scheme.Open autoclave loam cake 2 and pull down shower nozzle 25, the sample of being processed 24 is fixed on the specimen holder 33, utilizes poly-tetrafluoro bolt 32 that specimen holder 33 is fixed on the jig pallet 34, sample 24 links to each other with copper rod 9 by copper spring 35, constitute the working electrode in the three-electrode system, shower nozzle 25 is installed.Pour the dielectric solution of certain volume in autoclave 31, open the leakage fluid dram 14 in the closed circuit 10 simultaneously, with the gas emptying in the device, the liquid level of medium solution will be higher than the upper surface of sample 24, covers autoclave loam cake 2.Feed gas N from autoclave air intake opening 1 2More than the deoxygenation 8h, the back feeds the experimental gas of certain pressure (as CO 2Gas) and be heated to design temperature.Open the gauge tap of the volute pump 15 in the control box, make volute pump 15 runnings carry out injection experiment, open circulating cooling system 17, the heat tracing system of closed circuit 10 simultaneously, guarantee that whole device is in steady state (SS).Regulate the flow that flowmeter valve 12 and bypass valve 13 change by high-temperature high-pressure liquid flowmeter body 11, thereby change shower nozzle 25 place's flow rate of fluid, reach the erosion corrosion simulated experiment effect of expection.Working electrode copper rod 9 utilizes copper nut 2 43 to link to each other with the working electrode end of electrochemical workstation, and auxiliary electrode 7 links to each other with the corresponding interface of electrochemical workstation respectively by signal transduction pathway with High Temperature High Pressure Ag/AgCl contrast electrode 21.The temperature that on control box, shows pressure, temperature and closed circuit 10 in the autoclave 31.

Claims (2)

1. high-temperature high-pressure loop spray corrosion simulation and electro-chemical test experimental provision is characterized in that: comprise autoclave (31), the heat tracing system, loop water inlet (5), three-electrode system, pipeline switching flange (8), closed circuit (10), high-temperature high-pressure liquid flowmeter body (11), by-pass valve control, leakage fluid dram (14), volute pump (15), circulating cooling system (17), temp measuring system, pipeline joint flange (20), loop water delivering orifice (22), shower nozzle (25), specimen holder (33), control box, signal transduction pathway, external electrochemical workstation and external gas cylinder;
Autoclave (31) is by draft tube (1), autoclave loam cake (2), autoclave body (4), autoclave lower cover (6), viton seal ring one (23), pressure transducer (26), tensimeter (27), safety valve (28) and gas outlet (30) formation; The heat tracing system is made of autoclave heating and heat-insulating device (3) and closed circuit heating and heat-insulating device (46); Three-electrode system is made of auxiliary electrode (7), working electrode copper rod (9) and High Temperature High Pressure Ag/AgCl contrast electrode (21); By-pass valve control comprises flowmeter valve (12) and bypass valve (13); Circulating cooling system (17) is made of circulating cooling system water delivering orifice (16) and circulating cooling system water inlet (19); Temp measuring system is made of temperature sensor (29) in closed circuit temperature sensor (18) and the autoclave; Control box is made of temperature in the kettle control instrument, loop temperature control instrument, circulating cooling system gauge tap and volute pump gauge tap; Signal transduction pathway is made of the lead between electrochemical workstation and three electrodes;
Utilize between the wireway of gas cylinder and the draft tube of autoclave (1) and be threaded; Control box links to each other with autoclave (31), loop heat tracing system, circulating cooling system (17) and volute pump (15) by lead; Closed circuit water inlet (22) is connected with the bolt card cover by welding respectively with autoclave lower cover (6) with water delivering orifice (5); Closed circuit (10) utilizes pipeline joint flange (20) to be connected with pipeline switching flange (8) with autoclave (31); The water side of closed circuit changes pipeline diameter by the pipeline flange (8) of transferring; Closed circuit (10) pipeline outer wall is equipped with circulating cooling system (17) and heat tracing system; Utilize bolt to be connected between circulating cooling system (17) and the closed circuit (10); The flow velocity that shower nozzle (25) is located is regulated by flowmeter valve (12) and bypass valve (13); Auxiliary electrode (7) and High Temperature High Pressure contrast electrode (21) and autoclave lower cover (6) are for being threaded; Sample (24) is embedded on the specimen holder (33), and specimen holder (33) utilizes poly-tetrafluoro bolt (32) fastening with jig pallet (34), and viton seal ring two (36) seals; Utilize copper spring (35) to link to each other between sample (24) and the copper rod (9), copper rod (9) is fastening by cylindric copper nut (37) and jig pallet (34), and and autoclave lower cover (6) between utilize poly-tetrafluoro sleeve (40) of band awl and poly-tetrafluoro circular cone (41) to seal, copper nut one (42) and poly-Tetrafluoro spacer one (44) are fastening; The pressure transducer of autoclave (26) is measured environmental pressure in the still, and precision is 0.01MPa; Temperature sensor (29) is measured solution temperature in the still in the autoclave, and closed circuit temperature sensor (18) is measured the loop solution temperature, and precision is 0.1 ℃.
2. a kind of high-temperature high-pressure loop spray corrosion simulation as claimed in claim 1 and electro-chemical test experimental provision, it is characterized in that: circulating cooling system (17) utilizes refrigerator to eliminate the heat that shower nozzle (25) is located to produce, and guarantees that in conjunction with the heat tracing system of closed circuit (10) and the heat tracing system (3) of autoclave whole device is in steady state (SS); Closed circuit (10) is connected with autoclave (31) with pipeline switching flange (8) by pipeline joint flange (20), and is for convenience detach; Utilize poly-tetrafluoro bolt (32) fastening between specimen holder (33) and the jig pallet (34), and use viton seal ring two (36) to seal, guarantee that copper rod (9) does not contact with solution medium; Copper rod (9) links to each other by copper spring (35) with sample (24), guarantees that copper rod contacts with sample well; Copper rod (9) utilizes cylinder copper nut (37), copper nut one (42), pallet column (38), the poly-tetrafluoro sleeve (40) of band awl and poly-tetrafluoro awl (41) to carry out fit sealing; Shower nozzle (25) is connected with pipeline by screw thread.
CN2010206969957U 2010-05-28 2010-12-23 High-temperature and high-pressure loop circuit spraying corrosion simulation and electrochemistry testing experimental device CN201984019U (en)

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CN201010194447A CN101865816A (en) 2010-05-28 2010-05-28 Experimental apparatus for high-temperature high-pressure loop spray corrosion simulation and electrochemical testing
CN2010206969957U CN201984019U (en) 2010-05-28 2010-12-23 High-temperature and high-pressure loop circuit spraying corrosion simulation and electrochemistry testing experimental device

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