METHOD FOR ARRANGING A CHEMICAL BARRIER IN A GASIFYING REACTOR FOR BLACK LIQUOR, A CHEMICAL GASIFYING REACTOR, A BARRIER LAYER OF A REACTOR AND A METHOD FOR MANUFACTURING A BUILDING BLOCK FOR SUCH A BARRIER LAYER

摘要

A chemical reactor and a method for arranging a ceramic barrier in a gasifying reactor, which reactor is arranged to convert high energy organic waste of black liquor type with a large amount of organic or inorganic alkali metal compounds, by high temperature oxidation with air or oxygen, whereby the organic waste is converted to a hot reducing gas containing a considerable amount of water vapour and the inorganic compounds form an alkali-containing salt melt at a temperature of 750-1150° C., and which reactor is arranged to comprise an outer shell ( 14 ) with associated inlet and outlet devices for reactants and products, the method comprising the arranging of a lining ( 16, 18 ) comprising one or more layers of ceramic barriers ( 16, 18 ) on the inside of the shell ( 14 ), the innermost ceramic barrier ( 16 ) of the reactor being composed of a lining material that primarily contains compounds of aluminium oxide (Al₂O₃), and at least one of alkali metal oxides (Me2^(I)O) and alkaline earth metal oxides (Me^(I)0), forming compounds of the type Me2^(I)O Al2O3 and Me^(II)0-Al₂O₃.