CN218121718U - Corrosion testing device for supercritical hydrothermal solution molten salt system - Google Patents

Abstract

The utility model discloses a corrosion testing device for a supercritical hydrothermal molten salt system. The corrosion testing device for a supercritical hydrothermal molten salt system includes: a reactor kettle, a reactor for sealing The top cover of the kettle body; the corrosion test device used for the supercritical hydrothermal molten salt system is under certain temperature and pressure conditions, so that the corrosion sample is immersed in the supercritical water-molten salt environment, and removed through the insulating liner pipe The interference of galvanic corrosion between the corrosion test device and the corrosion sample; the interference of molten salt on the transfer of elements between different materials is removed through the metal liner. The height of the corrosion sample immersed in the corrosive fluid can be adjusted by adjusting the length of the telescopic rod, and the interference of galvanic corrosion to the test can be removed by connecting the telescopic rod and the metal frame of the hanging piece by using a connector; by using the same material as the corrosion sample The metal gasket removes the interference of molten salt on the transfer of elements between different materials.

Description

A corrosion test device for supercritical hydrothermal molten salt system

technical field

The utility model relates to the technical field of supercritical water, in particular to a corrosion testing device for a supercritical hydrothermal molten salt system.

Background technique

Supercritical water (SCW; T>374°C, p>22.1MPa) is a fluid that exists at a pressure and temperature greater than the critical point of water, and has special properties (lower polarity, viscosity, and surface tension). It has potential application prospects in many fields such as hazardous pollutant treatment, material synthesis, and biomass conversion. A technology that utilizes the special physical and chemical properties of supercritical water—supercritical water oxidation technology (SCWO), is an advanced oxidation treatment technology for refractory hazardous waste without producing secondary pollutants such as NOx or SOx. Taking advantage of its special physical and chemical properties, organic matter in supercritical water can react with oxidants in a single phase, without mass transfer resistance between phases, and the reaction time is greatly shortened, so that refractory organic matter can be quickly and completely oxidized into CO2, H2O, N2 and inorganic salts, etc. Harmless compounds, and recycled. However, due to the low polarity, density and dielectric constant of supercritical water, the solubility of inorganic salts is significantly reduced, and some inorganic salts crystallize and deposit on heat exchangers and reactors, resulting in reduced system pressure and heat transfer efficiency. More importantly, the inorganic salts precipitated in the supercritical water environment are very viscous, causing pipeline blockage. Moreover, equipment materials will suffer strong corrosion under high temperature and high pressure. If the reaction substances contain heteroatoms such as Cl, Br, F, S, P, etc., the corrosion will be intensified. In the actual industrial application process, supercritical water oxidation technology has been facing two bottlenecks: rapid corrosion failure of equipment materials and salt deposition blocking pipelines affecting heat exchange efficiency.

Hydrothermal molten salt is a new type of solvent system consisting of two phases of supercritical water and molten salt. The solubility of inorganic salt in supercritical water is extremely low, so when the temperature reaches the precipitation temperature of salt, the inorganic salt will precipitate. If the precipitation temperature is higher than the melting point of salt, the inorganic salt will melt instantly and form supercritical water. —The hydrothermal molten salt of the molten salt two-phase coexistence system. Inorganic salts deposited in supercritical water are highly viscous, not only clogging pipes but also causing increased corrosion. The inorganic salts deposited in supercritical water can be dissolved by using hydrothermal molten salts. The fluidity of molten salts can take away the continuously deposited inorganic salts. The use of molten salts in supercritical water oxidation systems can dissolve and remove deposited inorganic salt layers. Molten salts It can also preferentially precipitate inorganic salts to prevent pipeline blockage.

In order to apply hydrothermal molten salt to solve the problems of corrosion and salt deposition in supercritical water oxidation, and explore the corrosion resistance of candidate materials in hydrothermal molten salt system, but the existing supercritical water corrosion There is a great interference in the corrosion test of materials, the main reason is the high ion diffusion rate of the molten salt liquid, the direct contact between the molten salt liquid and the reactor and the sample will form the galvanic corrosion effect of dissimilar metals, and due to different Materials in direct contact, through the transfer of molten salt, will cause element migration between the reactor components and the sample, affecting the experimental results.

Therefore, a corrosion testing device for a supercritical hydrothermal molten salt system is needed to solve the above problems.

Utility model content

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A corrosion testing device for a supercritical hydrothermal molten salt system, said corrosion testing device for a supercritical hydrothermal molten salt system comprising: a reactor still, a top cover for sealing the reactor still body ;

The top cover and the reactor kettle are detachably connected by bolts; the top cover is provided with a pressure gauge interface pipe, a solution inlet pipe, a solution outlet pipe and a safety valve interface pipe; one end of the pressure gauge interface pipe is used to communicate with the inside of the reactor kettle, and the pressure The other end of the meter interface pipe is used to connect with the pressure gauge; one end of the solution inlet pipe is used to pass in corrosive fluid, and the other end is connected to the inside of the reactor tank; one end of the solution outlet pipe is connected to the inside of the reactor tank, and the other end is used to The fluid is discharged from the inside of the reactor tank; one end of the safety valve interface pipe is used to communicate with the inside of the reactor tank, and the other end of the safety valve interface is used to connect with the safety valve; the inside of the reactor tank is provided with insulating hanging parts.

Further, the reactor kettle includes a kettle body, an insulating lining pipe, and a metal lining pipe; the kettle body is a hollow cylinder structure with an open upper end and a sealed lower end; the insulating inner lining pipe is accommodated in the kettle body; the metal inner lining pipe is accommodated in Inside the insulating lining pipe, the insulating hanger part is arranged inside the metal lining pipe.

Further, the insulating hanging part includes a telescopic rod, a connector, a hanging metal frame, two fastening bolts and two metal gaskets;

One end of the telescopic rod is connected with the top cover, and the other end is connected with the connecting piece; The fastening bolt is fixedly connected with a metal gasket; the two metal gaskets are arranged opposite to each other.

Preferably, the insulating inner liner is detachably sleeved in the still body; the metal inner liner is detachably sleeved inside the insulating inner liner.

Preferably, the fastening bolt includes a screw head and a screw rod, one end of the screw rod is connected to the screw head, and the other end is fixedly connected to a metal washer; the screw rod is screwed to the metal frame of the coupon.

Preferably, the corrosion testing device for the supercritical hydrothermal molten salt system also includes: a temperature measuring sleeve, one end of the temperature measuring sleeve is arranged inside the metal liner, and the inside of the temperature measuring sleeve is used for containing and measuring temperature element.

Preferably, the connector is an insulated ceramic ring buckle, which is respectively hinged to the hanging piece metal frame and the telescopic rod, and the hanging piece metal frame is arranged under the telescopic rod.

Preferably, the telescopic rod is a metal telescopic rod.

Preferably, an annular groove is arranged on the top of the kettle body, and a sealing gasket is arranged in the annular groove.

Further, the sealing gasket is made of graphite or copper.

Further, the annular groove is a T-shaped annular groove structure in section, and the sealing gasket accommodates the top of the T-shaped annular groove structure.

Preferably, the top cover is arranged on the top of the kettle body, and a copper sealing sheet is arranged between the top cover and the kettle body, and the copper sealing sheet has an annular structure.

Preferably, the pressure gauge interface pipe, the solution inlet pipe, the solution outlet pipe, and the safety valve interface pipe are all in communication with the metal lining pipe.

Preferably, the material of the corrosion sample is the same as that of the metal gasket.

Due to the adoption of the above-mentioned technical scheme, the technical progress achieved by the utility model compared with the prior art is: the corrosion testing device used for the supercritical hydrothermal molten salt system is under a certain temperature and pressure condition, so that the corrosion sample is in the In the environment of supercritical water-molten salt immersion, the interference of galvanic corrosion between the corrosion test device and the corrosion sample is removed through the insulating liner; the interference of the molten salt on the transfer of elements between different materials is removed through the metal liner. The height of the corrosion sample immersed in the corrosive fluid can be adjusted by adjusting the length of the telescopic rod, and the interference of galvanic corrosion to the test can be removed by connecting the telescopic rod and the metal frame of the hanging piece by using a connector; by using the same material as the corrosion sample The metal gasket removes the interference of the molten salt on the transfer of elements between different materials. The safety valve is connected internally with the metal liner through the safety valve interface pipe to protect the entire device from overpressure. The pressure gauge is connected to the pressure gauge interface pipe and monitored by the pressure gauge. And ensure the stable operation of the corrosion test device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is a kind of structure schematic diagram of the corrosion testing device that is used for supercritical hydrothermal molten salt system of the present utility model;

Description of main component symbols

The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned accompanying drawings.

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used in the description of the utility model herein is only for the purpose of describing specific embodiments, and is not intended to limit the utility model. The terms "first", "second" and the like in the specification and claims of the present utility model and the above drawings are used to distinguish different objects, rather than to describe a specific sequence. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to be non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or devices.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Please refer to Fig. 1, a kind of corrosion testing device for supercritical hydrothermal molten salt system, described corrosion testing device for supercritical hydrothermal molten salt system includes: reactor kettle 1, for sealing reaction The top cover 2 of the kettle body;

The top cover 2 and the reactor kettle 1 are detachably connected by bolts; the top cover 2 is provided with a pressure gauge interface pipe 21, a solution inlet pipe 22, a solution outlet pipe 23 and a safety valve interface pipe 24; one end of the pressure gauge interface pipe 21 is used for The other end of the pressure gauge interface pipe 21 is used to connect with the pressure gauge; one end of the solution inlet pipe 22 is used to feed corrosive fluid, and the other end communicates with the interior of the reactor kettle 1; one end of the solution outlet pipe 23 It communicates with the inside of the reactor kettle 1, and the other end is used to discharge the corrosive fluid from the inside of the reactor kettle 1; one end of the safety valve interface pipe 24 is used to communicate with the interior of the reactor kettle 1, and the other end of the safety valve interface pipe 24 is used to communicate with the safety valve. valve connection;

The reactor kettle 1 includes a kettle body 11, an insulating lining pipe 12, and a metal lining pipe 13; the kettle body 11 is a hollow cylinder structure with an open upper end and a sealed lower end; the insulating inner lining pipe 12 is accommodated in the kettle body 11; The lining pipe 13 is accommodated inside the insulating lining pipe 12 .

The metal lining pipe 13 is provided with an insulating hanger part 3; the insulating hanger part 3 includes a telescopic rod 31, a connector 32, a hanger metal frame 33, two fastening bolts 34 and two metal gaskets 35;

One end of the telescopic rod 31 is connected with the top cover 2, and the other end is connected with the connecting piece 32; the connecting piece 32 is connected with the metal frame 33 of the hanging piece; The sheet metal frame 33 is threaded; each fastening bolt 34 is fixedly connected with a metal washer 35; the two metal washer 35 are arranged oppositely.

In one embodiment of the present invention, the insulating lining pipe 12 is detachably sleeved in the kettle body 11 ; the metal lining pipe 13 is detachably sleeved inside the insulating lining pipe 12 .

In one embodiment of the utility model, the fastening bolt 34 includes a screw head 341 and a screw rod 342, one end of the screw rod 342 is connected with the screw head 341, and the other end is fixedly connected with a metal washer 35; Sheet metal frame 33 threaded connections.

In one embodiment of the present utility model, the corrosion testing device for the supercritical hydrothermal molten salt system includes: a temperature measuring sleeve 25, and one end of the temperature measuring sleeve 25 is arranged inside the metal lining pipe 13 , the inside of the temperature measuring sleeve 25 is used to house the temperature measuring element.

In one embodiment of the present invention, the connector 32 is an insulated ceramic ring buckle, which is respectively hinged with the hanger metal frame 33 and the telescopic rod 31 , and the hanger metal frame 33 is arranged below the telescopic rod 31 .

In one embodiment of the present invention, the telescopic rod 31 is a metal telescopic rod.

In one embodiment of the present invention, an annular groove 111 is arranged on the top of the kettle body 11 , and a sealing gasket 112 is arranged in the annular groove 111 .

In one embodiment of the present utility model, the top cover 2 is arranged on the top of the kettle body 11, and a copper sealing sheet 113 is arranged between the top cover 2 and the kettle body 11.

In one embodiment of the present invention, the pressure gauge interface pipe 21 , the solution inlet pipe 22 , the solution outlet pipe 23 , and the safety valve interface pipe 24 are all in communication with the metal lining pipe 13 .

In one embodiment of the present invention, the corrosion sample 36 is made of the same material as the metal gasket 35 .

When the utility model is used, the corrosion test device used for the supercritical hydrothermal molten salt system is placed under certain temperature and pressure conditions, and the interference of galvanic corrosion between the corrosion test device and the corrosion sample 36 is removed through the insulating lining pipe 12 ; The metal liner 13 is used to remove the interference of the molten salt on the transfer of elements between different materials. The corrosive fluid is fed into the metal lining pipe 13 through the solution inlet pipe 22; the corrosive fluid can be discharged from the solution outlet pipe 23. The corrosion sample 36 is clamped between the two metal gaskets 35 by adjusting the distance between the screw rods 342 of the two fastening bolts 34; the corrosion sample 36 is immersed in the The height in the corrosive fluid, by using the connecting piece 32 to connect the telescopic rod 31 and the metal frame 33 of the coupon, remove the interference of galvanic corrosion on the test; by using the metal gasket 35 of the same material as the corrosion sample 36 to remove the interference of molten salt The interference of element transfer between different materials, the safety valve is connected internally with the metal lining pipe 13 through the safety valve interface pipe 24 to protect the entire device from overpressure, the pressure gauge is connected to the pressure gauge interface pipe 21, and the pressure gauge monitors and ensures the corrosion test stable operation of the device.

The above has generally described the utility model in detail, but on the basis of the utility model, some modifications or improvements can be made to it, which is obvious to those skilled in the art. Therefore, any modification or improvement that does not depart from the spirit of the present utility model is within the protection scope of the present utility model.

Claims (10)

1. a corrosion testing device for supercritical hydrothermal molten salt system, it is characterized in that: the corrosion testing device for supercritical hydrothermal molten salt system comprises: reactor kettle, for sealing reaction The top cover of the kettle body; The top cover and the reactor kettle are detachably connected by bolts; the top cover is provided with a pressure gauge interface pipe, a solution inlet pipe, a solution outlet pipe and a safety valve interface pipe; one end of the pressure gauge interface pipe is used to communicate with the inside of the reactor kettle, and the pressure The other end of the meter interface pipe is used to connect with the pressure gauge; one end of the solution inlet pipe is used to pass in corrosive fluid, and the other end is connected to the inside of the reactor tank; one end of the solution outlet pipe is connected to the inside of the reactor tank, and the other end is used to The fluid is discharged from the inside of the reactor tank; one end of the safety valve interface pipe is used to communicate with the inside of the reactor tank, and the other end of the safety valve interface is used to connect with the safety valve; the inside of the reactor tank is provided with insulating hanging parts. 2. the corrosion testing device that is used for supercritical hydrothermal molten salt system as claimed in claim 1, is characterized in that: reactor still comprises kettle body, insulation liner pipe, metal liner pipe; still body is the upper end The hollow cylinder structure is sealed at the lower end of the opening; the insulating lining pipe is accommodated in the kettle; the metal lining pipe is accommodated inside the insulating lining pipe, and the insulating hanging part is arranged inside the metal lining pipe. 3. the corrosion testing device for supercritical hydrothermal molten salt system as claimed in claim 2, is characterized in that: described insulating hanger part comprises expansion rod, connector, hanger metal frame, two fastening pieces Bolts and two metal washers; One end of the telescopic rod is connected with the top cover, and the other end is connected with the connecting piece; The fastening bolt is fixedly connected with a metal gasket; the two metal gaskets are arranged opposite to each other. 4. The corrosion testing device for supercritical hydrothermal molten salt system as claimed in claim 3, characterized in that: the insulating inner liner is detachably sleeved in the still body; the metal inner liner is detachably sleeved in the insulating Inside the liner. 5. as the arbitrary described corrosion testing device of claim 1-4 for supercritical hydrothermal molten salt system, it is characterized in that: fastening bolt comprises screw head and screw rod, and described screw rod one end links to each other with screw head , the other end is fixedly connected with a metal gasket; the screw rod is threadedly connected with the metal frame of the hanger. 6. the corrosion testing device for supercritical hydrothermal molten salt system as claimed in claim 5, is characterized in that: the corrosion testing device for supercritical hydrothermal molten salt system also includes: temperature measurement Sleeve, one end of the temperature measurement sleeve is arranged inside the metal liner, and the inside of the temperature measurement sleeve is used to accommodate the temperature measurement element. 7. The corrosion testing device for supercritical hydrothermal molten salt system as claimed in claim 6, characterized in that: the connector is an insulating ceramic ring snap, which is respectively hinged with the hanging piece metal frame and the telescopic rod, The hanging piece metal frame is arranged under the telescopic rod. 8. The corrosion test device for supercritical hydrothermal molten salt system as claimed in claim 7, characterized in that: the top of the kettle body is provided with a ring groove, and a sealing gasket is arranged in the ring groove. 9. The corrosion test device for supercritical hydrothermal molten salt system as claimed in claim 8, characterized in that: the top cover is arranged on the top of the kettle body, and a copper sealing sheet is arranged between the top cover and the kettle body. 10. The corrosion testing device for supercritical hydrothermal molten salt system as claimed in claim 9, characterized in that: the material of the corrosion sample is the same as that of the metal gasket.

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