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
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/02—Apparatus characterised by being constructed of material selected for its chemically-resistant properties
• • 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
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/0053—Details of the reactor
  • B01J19/0066—Stirrers
• • 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
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/24—Stationary reactors without moving elements inside
  • B01J19/2415—Tubular reactors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
  • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
  • F16L58/04—Coatings characterised by the materials used
  • F16L58/08—Coatings characterised by the materials used by metal
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
  • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
  • F16L58/04—Coatings characterised by the materials used
  • F16L58/14—Coatings characterised by the materials used by ceramic or vitreous materials
• • 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
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/02—Apparatus characterised by their chemically-resistant properties
  • B01J2219/0204—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components
  • B01J2219/0218—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components of ceramic
• • 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
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/02—Apparatus characterised by their chemically-resistant properties
  • B01J2219/0204—Apparatus characterised by their chemically-resistant properties comprising coatings on the surfaces in direct contact with the reactive components
  • B01J2219/0236—Metal based

Definitions

• the present invention relates to a reforming tube comprising means for avoiding in its cavity the phenomenon of corrosion called "metal dusting".
• metal dusting is meant a catastrophic disintegration of metals (Fe, Ni, Co) observed in the fuel atmospheres of chemical and petrochemical processes.
• the aluminization of the alloy involves reacting the aluminum vapor with the alloy to form an outer layer rich in aluminum.
• the chemical composition of the coating may vary. For example if we consider a Cr-Ni based alloy, the outer layer will contain Al, Ni and Cr.
• Composite tubes are another way to reduce corrosion. This solution is based on the assembly of two materials with dissimilar properties. Usually a material will have a high resistance to corrosion under the process conditions while
• FIRE REPLACEM ENT (RULE 26) that the other will have high mechanical properties. Both materials, usually alloys, are welded together using different manufacturing processes. This leads to two layers of materials having different thicknesses according to the process specifications. The main difficulty is to produce complex shapes and the problem of thermal expansion resulting in stresses that could increase the rate of corrosion or reduce the mechanical strength.
• the first limitation of existing solutions vis-à-vis the phenomenon of corrosion called "metal dusting" is the size of the parts to be protected.
• metal dusting the phenomenon of corrosion
• these tubes are about 13 m long and it is difficult to find companies that have the appropriate equipment to achieve a homogeneous coating (thickness and chemical composition) .
• the configuration of the parts to be protected can also reduce the choice in terms of coating techniques and chemical composition of the coating.
• a solution of the present invention is a reforming tube 1 comprising:
• the reforming tube according to the present invention may have one or more of the following characteristics:
• the refractory material 5 matches the shape of the inner wall and the shape of the protective part
• the refractory material 5 is chosen from: ceramic fiber fabrics, ceramic fiber paper, refractory ceramic fibers, and polycrystalline ceramic fibers.
• said tube comprises a seam 6 between the upper end of the protection piece and the inner wall
• said tube comprises a joint 7 between the lower end of the protection piece and the inner wall
• At least one joint 6 or 7 is a weld, a solder or a joint made with glass or ceramic glass;
• the protective part 4 comprises an inert material with respect to corrosion by metal dusting
• the material of the protective part is chosen from alloys based on nickel and chromium; examples that may be mentioned are commercial alloys 601, 617, 690 and 693;
• the material of the protective part 4 is made of ceramic or has a ceramic coating;
• the corrosion protection piece 4 comprises a material having a low resistance to corrosion and coated with a material having a very good corrosion resistance or a ceramic coating;
• the ceramic may be chosen from Al 2 O 3, MgAl 2 O 4, ZrO 2, Y 2 O 3 -ZrO 2, MgO, MgO-ZrO 2, Al 2 O 3 -ZrO 2, SiC, and SiN 4.
• the solution proposed is to insert a protected ceramic or metal part.
• the constituent material of this protective part is selected according to its resistance to corrosion and its chemical and physical compatibility with the alloy of the tube.
• the protective piece does not stick to the alloy of the tube which makes a big difference with the solutions of the prior art.
• the degree of freedom between the tube and the protective part makes it possible to reduce the mechanical stresses that could be induced by the thermal expansion of the parts exposed to high temperatures (400-1000 ° C).
• this space between the inner wall of the tube and the protective part could lead to a flow of synthesis gas. Also, it is necessary to avoid the access of synthesis gas in this space.
• the present invention proposes as a main solution to the problem of access of the synthesis gas in said space, the use of a refractory material filling said space between the inner wall and the protective part.
• the refractory material adjusts to the shape of the inner wall of the tube.
• the refractory material must be selected according to its ability to withstand a synthesis gas atmosphere (H2, CO, CH4, H2O) at high temperature (800 to 1000 ° C) and to deform when subjected to a limited load in order to fit the shape of the inner wall of the tube and the shape of the wall of the protective part.
• the reforming tube according to the invention will preferably be used for the production of hydrogen from synthesis gas.
• the solution proposed in the context of the invention solves the following problems: - corrosion protection possible for large areas of the reforming tube.
• large surface is meant parts whose dimensions make it difficult or impossible to apply a protective coating;

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Mechanical Engineering (AREA)
• Ceramic Engineering (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Hydrogen, Water And Hydrids (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54035120

Family Applications (2)

Family Applications Before (1)

Country Status (4)

Cited By (1)

Family Cites Families (11)

• 2015
  • 2015-08-12 EP EP15180784.9A patent/EP3130397A1/de not_active Withdrawn
• 2016
  • 2016-08-11 WO PCT/EP2016/069106 patent/WO2017025587A1/fr active Application Filing
  • 2016-08-11 US US15/751,352 patent/US10421057B2/en active Active
  • 2016-08-11 CN CN201690001080.5U patent/CN208906063U/zh active Active
  • 2016-08-11 EP EP16750830.8A patent/EP3334521A1/de active Pending

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