Abstract: Provided is a reactor that is capable of suppressing deformation and damage of catalyst grains due to contraction of a reaction tube after thermal expansion thereof. A reactor includes: a reaction tube A aligned in an up-down direction and having, in a bottom section thereof, a catalyst supporter receiving packed catalyst grains and allowing a processed gas to flow therethrough; and a burning unit configured to heat an outer face of the reaction tube A. The reaction tube A has a cylindrical catalyst support face U that is in contact with the catalyst grains in the reaction tube A and that have, in the up-down direction, a plurality of engaging recesses each capable of receiving a portion of the catalyst grain in contact with the catalyst support face in such a manner that the portion of the catalyst grain is fitted into the engaging recess.

Abstract: A method for hydrogen production by pressure swing adsorption that can increase the recovery efficiency of an adsorption target component while enabling an off-gas to be appropriately supplied to a combustion device is provided that can achieve a cost reduction and an increase in the efficiency of the combustion operation.

Abstract: A method for hydrogen production by pressure swing adsorption that can increase the recovery efficiency of an adsorption target component while enabling an off-gas to be appropriately supplied to a combustion device is provided that can achieve a cost reduction and an increase in the efficiency of the combustion operation.

Abstract: A regenerator for use in an ammonia absorption refrigerator comprises a heater for heating an ammonia aqueous solution and a rectifying column for enriching ammonia in an ammonia solution-vapor mixture obtained in and introduced from the heater, wherein the heater comprises a heater body having a heating chamber, a burner of lean pre-mixture combustion type disposed in a lower portion of the heating chamber, and a heat transfer tube bundle provided in a meandering arrangement above the burner within the heating chamber, the heat transfer tube bundle having an inlet and an outlet which are respectively connected to lower portions of the rectifying column via transfer pipes.