L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

Francois Dehaine

Maurice Grenier

Marc Wagner

Francis Cabre

Alain Guillard

Jean-Pierre Gourbier

Gilles Bracque

Alain Grelaud

Michel Mouliney

Norbert Rieth

Daniel Gourdain

The heat exchanger is of the type comprising a stack of parallel plates and, between these plates, undulant spacers, each pair of plates defining a passage for fluid of generally flat shape. Certain passages (20) are subdivided over one part of their length into two closed subpassages (at 45, 57) at locations longitudinally offset relative to each other. The exchanger is applicable in cryogenic heat exchangers of installations for the distillation of air.

Heat exchanger with brazed plates

Air distillation installation comprising: (A) an air compressor group (1) whose output is connected to an outlet coupling (11); (B) two cylinders (2A, 2B) for the purification of air by adsorption having inlet/outlet couplings (12A, 12B); (C) a first framework (13) in which are mounted: (a) the accessories downstream of the compressor such as an assembly (14, 17) for precooling air; (b) accessories of the purification cylinders, such as an assembly of valves and a regeneration gas reheater (18); and (c) the connection conduits of the mentioned accessories, with their safety members and their automatic and/or remotely controlled valves, these conduits terminating in couplings (15, 22A, 22B, 23) for connection to other portions (1, 2A, 2B, 4) of the installation, and the corresponding monitoring, control and instrumentation members (21); (D) a second framework (31) in which are mounted: (d) the principal heat exchangers (24) and the subcoolers (25); (e) the assembly of the cold accessories such as the cryogenic valves and the cryogenic pumps (26) and the expansion turbines (27); and (f) the conduits for connecting the elements mounted in the second framework, with their safety members and their automatic and/or remotely controlled valves, these conduits terminating in couplings (29, 30) for connection to other portions (3, 5) of the installation; (E) an air distillation column (5) provided with a certain number of couplings (33) for the inlet and outlet of fluids; and (F) tubes (6) for connection between the associated couplings (11-15, 12A-22A, 12B-22B, 23-29, 30-33) of the portions (A) to (E) of the installation.

Installation for the distillation of air

A cryogenic unit for the separation of gases includes at least one distillation column (1) is preassembled in the factory. The column (1) with added tubing elements (2) constitutes a pre-equipped subassembly which is transported and installed at the worksite. The tubing elements are disposed so as to be inscribed in at least one elongated volume (3; 3.sub.1, 3.sub.2) lateral to the column and of reduced section. The subassembly (1,2) is disposed on at least one transport cradle (4, 4') and transported to the worksite on the cradle and mounted at the worksite in a cold box (10) Preferably, all the tubing elements are disposed in the cradle. The subassembly, with or without the cradle, is mounted adjacent one side wall of the cold box (10) and is spaced by insulation (13) from at least one liquid gas reservoir (11; 12) also in the cold box (10).

Process for the construction of a cryogenic unit for the separation of

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Villemomble, France

Francois Dehaine