GAS-TIGHT, HEAT-PERMEABLE, CERAMIC, MULTILAYER COMPOSITE PIPE Russian patent published in 2020 - IPC C04B37/00 F16L9/10 F16L13/07 

FIELD: manufacturing technology.

SUBSTANCE: proposed group of inventions relates to a gas-tight multi-layer composite pipe with a heat transfer coefficient of 1,000 W/(m²K). Multilayer composite pipe with a heat transfer coefficient of 1,000 W/(m²K) comprises at least two layers, namely a layer of non-porous monolithic oxide ceramics and a layer of an oxide fiber composite ceramics. Thickness of layer of oxide fiber composite ceramics ranges from 0.5 to 3 mm. Both layers are connected to each other with force closure or all-in-one forming a single structural element. Oxide fiber composite ceramic is a matrix of oxide ceramic particles containing ceramic oxide and/or non-oxide fibers. Two-tube reactor for endothermic reactions comprises two said multilayer composite pipes, wherein one composite pipe is surrounded by another composite pipe and inner composite pipe is open on both sides, while outer pipe is closed on one side. Said multilayer composite pipe can be used in producing synthesis gas by reforming hydrocarbons with steam and/or carbon dioxide, co-production of hydrogen and pyrolytic carbon by pyrolysis of hydrocarbons, obtaining hydrogen cyanide from methane and ammonia or from propane and ammonia, obtaining olefins by steam cracking of hydrocarbons and/or a combination of methane with formation of ethylene, acetylene, as well as benzene. It can be used as reaction tubes in reactors with axial temperature control, counter-flow reactors and membrane reactors, as well as radiation tubes, flame tubes and rotary tubes of rotary furnaces.

EFFECT: reaction pipe is hardened to allow operation at pressures from 1 to 15 bar and reaction temperatures up to 1,400 °C.

13 cl, 3 dwg, 2 tbl