CN114225837B - Composite lining pipe of supercritical water oxidation system reactor - Google Patents
Composite lining pipe of supercritical water oxidation system reactor Download PDFInfo
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- CN114225837B CN114225837B CN202111582972.2A CN202111582972A CN114225837B CN 114225837 B CN114225837 B CN 114225837B CN 202111582972 A CN202111582972 A CN 202111582972A CN 114225837 B CN114225837 B CN 114225837B
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- 238000009284 supercritical water oxidation Methods 0.000 title claims abstract description 40
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 34
- 230000007797 corrosion Effects 0.000 claims abstract description 27
- 238000005260 corrosion Methods 0.000 claims abstract description 27
- 150000002500 ions Chemical class 0.000 claims abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 26
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 15
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 239000000460 chlorine Substances 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 229910000856 hastalloy Inorganic materials 0.000 claims description 5
- 229910001119 inconels 625 Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910001055 inconels 600 Inorganic materials 0.000 claims description 3
- 229910021426 porous silicon Inorganic materials 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000601 superalloy Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/008—Processes carried out under supercritical conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
- B01J3/042—Pressure vessels, e.g. autoclaves in the form of a tube
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention provides a composite lining pipe of a supercritical water oxidation system reactor, which is axially divided into an upper pipe section, a middle pipe section and a lower pipe section; the upper pipe section is a high-temperature bearing section and is used for bearing heat of a supercritical water oxidation reaction environment in the supercritical water oxidation system reactor; the middle pipe section is a corrosion bearing section and is used for bearing the corrosion of dissolved ions after the reaction materials enter a subcritical state; the lower pipe section is a sealing support section and is used for balancing the axial pressure of the middle pipe section and is used for being in sealing connection with the lower end cover of the supercritical water oxidation system reactor. The invention can meet the requirements of different reaction environments in the supercritical water oxidation reactor, ensure the corrosion resistance and solve the problem of large-size molding of the lining pipe; and a metal plastic sealing structure is adopted among the pipe sections, so that the sealing effect is ensured, and the whole permeability is not influenced.
Description
Technical Field
The invention relates to the technical field of chemical machinery, in particular to a composite lining pipe of a supercritical water oxidation system reactor.
Background
The supercritical water oxidation technology is an organic matter ultimate degradation technology, and is the most effective treatment technology of the currently accepted organic pollutants due to the advantages of high decomposition rate, short reaction time, no secondary pollution and the like, but the problem of strong corrosion to reactor materials due to the supercritical reaction under the conditions of high temperature, high pressure and high corrosion is not solved, so that the technical development is restricted.
The lining pipe is a key component for controlling the infiltration amount and protecting corrosion in the supercritical water oxidation system reactor, a gap exists between the lining pipe and the outer layer of the reactor, and the body of the lining pipe is made of porous materials. During reaction, softened water in the gap penetrates into the inner part through pores on the pipe wall under the action of pressure to form a protective liquid film, so that the contact with the reaction materials is isolated, meanwhile, the softened water in the gap is at normal temperature, and the reaction materials can be cooled and diluted, so that the reaction materials enter a subcritical state from a supercritical state, and inorganic salt particles insoluble in the supercritical state are redissolved. Because the lining pipe needs to accurately control the water penetration quantity, certain requirements are imposed on the pore diameter structure of the lining pipe, but the existing porous material forming technology only needs sintering forming to realize the requirements; as the concentration of corrosive ions in the material is increased by the dissolution of the softened water and the reaction material, certain requirements are imposed on the corrosion resistance of the material of the lining pipe, and researches show that nickel-based alloys, titanium alloys, ceramics and other materials are ideal choices of the material of the lining pipe, wherein the nickel-based alloys can resist high temperature, chlorine and phosphorus corrosion; titanium alloys are resistant to chlorine corrosion but not to phosphorus corrosion; the ceramic material can resist chlorine, phosphorus and sulfur corrosion, but the ceramic material has large brittleness, is difficult to form a large-scale material, cannot meet the engineering size requirement, and cannot be independently used as a lining pipe material.
Disclosure of Invention
The invention aims to provide a composite lining pipe of a supercritical water oxidation reactor, which aims to solve the corrosion problem of the supercritical water oxidation reactor and the composite problem of metal and ceramic.
The invention adopts the following technical means:
the composite lining pipe of the supercritical water oxidation system reactor is axially divided into an upper pipe section, a middle pipe section and a lower pipe section; the upper pipe section is a high-temperature bearing section and is used for bearing heat of a supercritical water oxidation reaction environment in the supercritical water oxidation system reactor; the middle pipe section is a corrosion bearing section and is used for bearing the corrosion of dissolved ions after the reaction materials enter a subcritical state; the lower pipe section is a sealing support section and is used for balancing the axial pressure of the middle pipe section and is used for being in sealing connection with the lower end cover of the supercritical water oxidation system reactor.
Further, the upper pipe section is made of a high-temperature nickel-based alloy porous material;
the middle pipe section is made of porous ceramics or porous titanium alloy, and when the corrosion of the reaction material is mainly chlorine, the porous titanium alloy is adopted; when the reaction material is mainly corroded by phosphorus, porous ceramics are adopted; when the reaction materials are mainly corroded by sulfur or nitrate, porous ceramics or porous titanium alloy are adopted;
the lower pipe section is made of nickel-based alloy or titanium alloy.
Further, the length of the upper pipe section is 45% -70% of the total length of the lining pipe; the length of the middle pipe section is 20% -55% of the total length of the lining pipe; the lower pipe section is 10-15% of the total length of the lining pipe.
Further, the high temperature nickel-based alloy porous material is Inconel625, inconel 600, or Hastelloy C276; the porous ceramic is porous alumina, porous silicon carbide, porous zirconia or porous yttria; the porous titanium alloy is Ti Gr.2, ti Gr.5, ti Gr.7, ti Gr.9 or Ti Gr.12.
Further, the middle pipe section is connected with the upper pipe section and the lower pipe section through plastic sealing.
Further, the middle pipe section is in plastic sealing connection with the upper pipe section and the lower pipe section through a metal sealing gasket arranged between the two pipe sections, and the metal sealing gasket is in plastic deformation between the pipe sections.
Further, the metal sealing gasket is made of stainless steel, red copper or high-temperature alloy.
Further, the metal sealing gasket structure is a double-sided double-semicircle bulge structure; an application pressure P applied to the metal gasket Pressing And design external pressure p Outer part The method meets the following conditions: mu.P Pressing ≥P Outer part ，P Outer part ＝p Outer part ·L b ·2πr，p Outer part To design external pressure, P Outer part To design the corresponding pressure of external pressure, L b And r is the average circumferential outer diameter of the semicircular convex structure of the metal sealing gasket, and mu is the static friction coefficient.
Compared with the prior art, the invention has the following advantages:
the composite lining pipe of the supercritical water oxidation system reactor provided by the invention adopts metal and ceramic sectional compounding, so that the requirements of different reaction environments in the supercritical water oxidation reactor can be met, the corrosion resistance is ensured, and the problem of forming a large-size lining pipe can be solved; the metal plastic sealing structure is adopted among the pipe sections, so that the sealing effect is ensured, and the whole permeability of the pipe is not influenced; the sectional composite structure has low manufacturing cost, good plastic sealing effect and high reliability of the whole structure, and ensures the normal operation of the supercritical water oxidation reactor.
Based on the reasons, the invention can be widely popularized in the field of chemical machinery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a supercritical water oxidation system reactor configuration;
FIG. 2 is a schematic view of the composite liner tube according to the present invention;
FIG. 3 is a schematic view of the assembly structure of the metal gasket;
fig. 4 is a schematic view of the principle of plastic deformation of the metal gasket.
In the figure: 1. a high temperature bolt; 2. a compression ring; 3. a lower end cap; 4. a reactor housing; 5. an inner liner tube; 6. an upper end cap; 7. a demineralized water inlet; 8. an organic material inlet; 9. an oxidant inlet; 10. a reaction product outlet; 501. an upper pipe section; 502. a middle pipe section; 503. a lower pipe section; 504. a metal gasket.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-4, the invention provides a composite lining pipe of a supercritical water oxidation system reactor, which is a segmented structure composed of different porous materials so as to adapt to different temperature distribution in the axial direction in the reactor and corrosion of materials with different concentrations; the supercritical water oxidation system reactor comprises a reactor shell 4, wherein the reactor shell comprises an upper end cover 6 and a lower end cover 3, the upper end cover 6 is provided with an oxidant inlet 9, an organic material inlet 8 and a softened water inlet 7, the lining pipe 5 is arranged in the reactor shell 4, the lower end cover 3 is provided with a reaction product outlet 10, and the lower end cover 3 is arranged at the bottom of the reactor shell 4 through a compression ring 2 and a high-temperature bolt 1;
the liner tube 5 is axially divided into an upper tube segment 501, a middle tube segment 502 and a lower tube segment 503;
the upper pipe section 501 is a high-temperature bearing section for bearing heat of a supercritical water oxidation reaction environment in a supercritical water oxidation system reactor, and the reactant fluid in the section is in a supercritical state, so that the fluid density is low and the corrosion effect on wall materials is low;
the middle pipe section 502 is a corrosion bearing section for bearing the corrosion of dissolved ions after the reaction materials enter a subcritical state, the temperature of the reaction materials in the section is reduced and the reaction materials are mixed with permeated softened water, the reaction materials enter the subcritical state, the density of the fluid is increased, and the inorganic salt which is insoluble in the supercritical state is redissolved, so that the corrosiveness of the materials is enhanced;
the lower pipe section 503 is a sealing support section and is used for balancing the axial pressure of the middle pipe section 502 and is used for being in sealing connection with the lower end cover 3 of the supercritical water oxidation system reactor.
Further, the upper pipe section 501 is made of a high-temperature nickel-based alloy porous material; the nickel-based alloy can bear the temperature of more than 700 ℃ and meet the temperature field requirement of the supercritical water oxidation reaction environment in the reactor, and the nickel-based alloy can resist corrosion by establishing a chromium oxide and nickel oxide passivation layer in the supercritical environment, and has certain corrosion resistance under the condition of no dissolved corrosive ions;
the middle pipe section 502 is made of porous ceramics or porous titanium alloy, corresponding materials can be selected according to the components and corrosion degree of the reaction materials, and when the reaction materials are mainly corroded by chlorine, the porous titanium alloy is adopted; when the reaction material is mainly corroded by phosphorus, porous ceramics are adopted; when the reaction materials are mainly corroded by sulfur or nitrate, porous ceramics or porous titanium alloy are adopted;
the lower tube section 503 is made of nickel-based alloy or titanium alloy to facilitate machining of the sealing end face to meet the surface quality requirements of the seal.
Further, the length of each tube section can be determined according to the reaction temperature field, and in this embodiment, the supercritical reaction zone is about 45% -70% of the reactor, so that the length of the upper tube section 501 is 45% -70% of the total length of the lining tube 5; the subcritical reaction zone is about 20% -55% of the reactor, so that the length of the middle pipe section 502 is 20% -55% of the total length of the lining pipe 5; the lower tube section 503 is 10-15% of the total length of the lining tube 5.
Further, the high temperature nickel-base alloy porous material is Inconel625, inconel 600 or Hastelloy C276, etc.; the porous ceramic is porous alumina, porous silicon carbide, porous zirconia, porous yttria or the like; the porous titanium alloy is Ti Gr.2, ti Gr.5, ti Gr.7, ti Gr.9 or Ti Gr.12, etc.
Further, the middle pipe section 502 is connected with the upper pipe section 501 and the lower pipe section 503 by plastic sealing.
Further, the middle pipe section 502 is in plastic sealing connection with the upper pipe section 501 and the lower pipe section 503 through a metal gasket 504 arranged between the two pipe sections, and the metal gasket 504 is plastically deformed by applying a certain pressure, so that the metal gasket is in close contact with the upper pipe section and the lower pipe section, contact stress is generated, static friction force is generated by the contact stress, and if the static friction force is larger than external fluid pressure, sealing can be realized.
Further, the metal gasket 504 is made of stainless steel, red copper or a superalloy.
Further, the metal gasket 504 is a double-sided double-semicircle protrusion structure, that is, two semicircle protrusion structures are respectively disposed on the upper surface and the lower surface, and plastic deformation can be generated by applying a certain pressure to the semicircle protrusion structures, so as to play a role in sealing; an application pressure P applied to the metal gasket 504 Pressing And design external pressure p Outer part The method meets the following conditions: mu.P Pressing ≥P Outer part ，P Outer part ＝p Outer part ·L b ·2πr，p Outer part To design external pressure, P Outer part To design the corresponding pressure of external pressure, L b R is the average circumferential outer diameter of the semi-circular protrusion structure of the metal gasket 504, which is the remaining thickness of the semi-circular protrusion structure of the metal gasket 504 after plastic deformation, and r is the average circumferential outer diameter of the semi-circular protrusion structure of the metal gasket 504 Outer part Instead, μ is the coefficient of static friction.
The sectional composite porous lining pipe provided by the invention can meet the requirements of different reaction environments in a supercritical water oxidation reactor, ensure the corrosion resistance and solve the problem of large-size forming of the lining pipe; the metal plastic sealing structure is adopted among the pipe sections, so that the sealing effect is ensured, and the whole permeability is not influenced; the sectional composite structure has low manufacturing cost, good plastic sealing effect and high reliability of the whole structure, and ensures the normal operation of the supercritical water oxidation reactor.
The application process of the composite lining pipe of the supercritical water oxidation system reactor provided by the invention specifically comprises the following steps:
further, the lower end of the upper pipe section 501, the upper and lower ends of the middle pipe section 502, and the upper end of the lower pipe section 503 are provided with grooves for placing the metal gasket 504.
1) Placing the metal gasket 504 into a groove at the upper end of the lower pipe section 503, and pre-installing the metal gasket in the bottom of the reactor together with the lower pipe section 503;
2) Placing another one of said metal gaskets 504 into a recess in the upper end of said middle tube section 502 and vertically down onto said lower tube section 503 while ensuring that said metal gasket 504 in the upper end of said lower tube section 503 is entirely within a recess in the lower end of said middle tube section 502;
3) Vertically lowering the upper pipe section 501 onto the middle pipe section 502 while ensuring that the metal gasket 504 at the upper end of the middle pipe section 502 is entirely within the groove at the lower end of the upper pipe section 501;
4) Design external pressure p obtained according to container design requirement Outer part Applying a certain pressure P to the upper pipe section Pressing Until plastic deformation occurs at the semicircular convex structures of the metal gaskets 504, the plastic deformation is tightly contacted with the bottom surface of the groove of each pipe section, sealing is realized, and all pipe sections are installed.
Example 1
In the embodiment, a supercritical water oxidation technology is adopted to treat phosphorus-containing organic wastewater, in a composite lining pipe of a supercritical water oxidation system reactor, an upper pipe section 501 is made of an Inconel625 high-temperature nickel-based alloy porous material, a middle pipe section 502 is made of an alpha-alumina porous ceramic material, a lower pipe section 503 is made of a Hastelloy C276 porous material, and a metal sealing gasket 504 is made of an S316 stainless steel material; the total length of the composite lining pipe 5 is 1000mm, the length of the upper pipe section 501 is 600mm, the length of the middle pipe section is 300mm, and the length of the lower pipe section is 100mm according to the distribution of reaction temperature fields.
The reactor design requires an upper and lower end cap assembly pressure of 125KN (i.e., the application pressure P applied to the metal gasket 504) Pressing ) The static friction coefficient mu is 0.5, the design external pressure of the lining pipe 5 is p Outer part 30MPa, the average outer diameter of the semicircular convex structure of the metal gasket 504 is 120mm, the residual thickness of the convex after plastic deformation is 1mm, and the requirements of mu.P are met Pressing ≥P Outer part I.e. the metal gasket 504 meets the sealing requirements.
Example 2
In the embodiment, a supercritical water oxidation technology is adopted to treat chlorine-containing organic wastewater, in a composite lining pipe of a supercritical water oxidation system reactor, an upper pipe section 501 is made of an Inconel625 porous material, a middle pipe section 502 is made of a Ti Gr.7 porous material, a lower pipe section 503 is made of a Hastelloy C276 porous material, and a metal sealing gasket 504 is made of an S316 stainless steel material; the total length of the composite lining pipe 5 is 2000mm, the length of the upper pipe section 501 is 1250mm, the length of the middle pipe section 502 is 550mm, and the length of the lower pipe section 503 is 200mm according to the distribution of the reaction temperature field.
The reactor design requires an upper and lower end cap assembly pressure of 314KN (i.e., the application pressure P applied to the metal gasket 504) Pressing ) The static friction coefficient mu is 0.5, the design external pressure of the lining pipe 5 is p Outer part 30MPa, the average external diameter of the semicircular convex structure of the metal gasket 504 is 200mm, the residual thickness of the convex after plastic deformation is 5mm, and the requirements of mu.P are met Pressing ≥P Outer part I.e. the metal gasket 504 meets the sealing requirements.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. A composite liner tube of a supercritical water oxidation system reactor, which is characterized by being axially divided into an upper tube section (501), a middle tube section (502) and a lower tube section (503); the upper pipe section (501) is a high-temperature bearing section and is used for bearing heat of a supercritical water oxidation reaction environment in a supercritical water oxidation system reactor; the middle pipe section (502) is a corrosion bearing section for bearing the corrosion of dissolved ions after the reaction materials enter a subcritical state; the lower pipe section (503) is a sealing support section and is used for balancing the axial pressure of the middle pipe section (502) and is used for being in sealing connection with the lower end cover of the supercritical water oxidation system reactor;
the upper pipe section (501) is made of a high-temperature nickel-based alloy porous material;
the middle pipe section (502) is made of porous ceramics or porous titanium alloy, and when the corrosion of the reaction material is mainly chlorine, the porous titanium alloy is adopted; when the reaction material is mainly corroded by phosphorus, porous ceramics are adopted; when the reaction materials are mainly corroded by sulfur or nitrate, porous ceramics or porous titanium alloy are adopted;
the lower pipe section (503) is made of nickel-based alloy or titanium alloy;
the middle pipe section (502) is in plastic sealing connection with the upper pipe section (501) and the lower pipe section (503) through a metal sealing gasket (504) arranged between the two pipe sections, and the metal sealing gasket (504) is in plastic deformation between the pipe sections;
the metal sealing gasket (504) is of a double-sided double-semicircle bulge structure; applying pressure to the metal gasket (504)P Pressing And design external pressurep Outer part The method meets the following conditions:，p outer part In order to design the external pressure of the device,P outer part In order to design the pressure intensity corresponding to the external pressure,L b is the residual thickness of the semicircular convex structure of the metal gasket (504) after plastic deformation,ris the average outer diameter of the metal gasket (504) in the circumferential direction at the semi-circular convex structure,/->Is the static friction coefficient.
2. The composite liner tube of a supercritical water oxidation system reactor according to claim 1, wherein the upper tube section (501) length is 45% -70% of the total length of the liner tube (5); the length of the middle pipe section (502) is 20% -55% of the total length of the lining pipe (5); the lower pipe section (503) is 10-15% of the total length of the lining pipe (5).
3. The composite liner tube of the supercritical water oxidation system reactor according to claim 1, wherein the high temperature nickel-based alloy porous material is Inconel625, inconel 600, or Hastelloy C276; the porous ceramic is porous alumina, porous silicon carbide, porous zirconia or porous yttria; the porous titanium alloy is Ti Gr.2, ti Gr.5, ti Gr.7, ti Gr.9 or Ti Gr.12.
4. The composite liner tube of a supercritical water oxidation system reactor according to claim 1, wherein the metal gasket (504) is made of stainless steel, red copper or a superalloy.
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