Abstract: A vertical ammonia converter with radial flow catalyst beds includes a recipient having an outer shell equipped with a dual duct inner tubular wall to route effluents in upward and downward directions, the tubular wall made of vertical tubes with gastight walls arranged in a circle on an outer periphery of an inner wall of the shell, open at their ends to route effluent to be treated in the upward direction from an injection chamber in a lower part of the shell to a distribution chamber in an upper part of the shell, which tubes are contiguous to a filtering media over a height of a catalyst bed, the filtering media open at an upper end to pass a downward-flowing effluent and closed at a lower end to route and distribute the effluent through their effluent-permeable face towards the catalyst bed retained on an outer face by the filtering media.

Abstract: A vertical catalytic ammonia converter whose recipient includes an outer shell and a dual duct tubular inner wall to route effluents upwards and downwards, said tubular wall comprising numerous tubular elements arranged in a circle on the outer periphery of the inner wall of the outer shell, said elements comprising gastight tubes that carry the effluent upwards, and contiguous to which are filtering media over the entire height of the catalyst bed, the filtering media being closed at the lower end to carry an effluent downwards and distribute it in said catalyst bed the outer face of which is retained by said filtering media.

Abstract: The invention relates to a system for externally holding a catalyst bed in a radial flow catalytic reactor, comprising a plurality of hollow longitudinal duct elements (2) regularly distributed in a peripheral ring around a central space (3) containing the catalyst bed and having a front filtering wall (5) facing the catalyst for the radial intake of a fluid to be treated in the catalyst bed (3). Each of the duct elements (2) is laterally defined by two lateral walls (6) radially oriented in the reactor (1) and comprising an assembling means for assembly with the respectively adjacent elements (2?) of the male member in female member (7, 8) type.

Abstract: The invention concerns a bore screen comprising a plurality of perforated rigid tubular modules (1) impermeably connected in series by ball joint means (2), allowing an extracted fluid to flow though all of the elements in series and allowing the consecutive elements to move freely relative to one another, tilting in all directions.

Abstract: The invention relates to a system for externally holding a catalyst bed in a radial flow catalytic reactor, comprising a plurality of hollow longitudinal duct elements (2) regularly distributed in a peripheral ring around a central space (3) containing the catalyst bed and having a front filtering wall (5) facing the catalyst for the radial intake of a fluid to be treated in the catalyst bed (3). Each of the duct elements (2) is laterally defined by two lateral walls (6) radially oriented in the reactor (1) and comprising an assembling means for assembly with the respectively adjacent elements (2?) of the male member in female member (7, 8) type.

Abstract: The invention concerns a bore screen comprising a plurality of perforated rigid tubular modules (1) impermeably connected in series by ball joint means (2), allowing an extracted fluid to flow though all of the elements in series and allowing the consecutive elements to move freely relative to one another, tilting in all directions.

Abstract: Replaceable outer support structure 38 for a particulate material bed 70 in a radial flow system comprises a plurality of hollow conduits 50, 250, 260, at least some of which have a generally trapezoidal cross-section. The conduits are arranged in a ring around the inside wall surface 39 of the vessel 42 and have flat or slightly concave inner wall surfaces 52 formed of segments of vertically extending screen members which have slots or openings 86 which provide uniform flow through the uniform thickness particulate bed which they help define The side walls 54, 56 of the conduits extend generally radially outwardly to engage the inner surface 39 of the outside wall 40 of the vessel and at least those of them which have a trapezoidal cross-section have their side walls formed at an included angle ? which is less than if they extended radially relative to the axis of the vessel.