Abstract: A continuous quick freezing apparatus for food composed of a freezing container in the shape of a hollow box which is separated into an upper compartment and a lower compartment by a cooling plate. A conveying belt for conveying food slides and moves on the cooling plate and is driven by a conveying means. The cooling plate is cooled via a cooling tube disposed beneath the cooling plate in contact therewith, while the conveying belt for the food is cooled simultaneously. Thus, the food placed on the conveying belt is cooled from below. In the upper compartment of the freezing container an air cooling plate is provided and the air in the upper compartment is cooled to an ultralow temperature in windless state. Thus, freezing is promoted all around the food conveyed on the conveying belt.

Abstract: This invention relates to a method of regenerating an alcohol-based antifreezing liquid, and more particularly to a method of concentrating and regenerating an alcohol-based antifreezing liquid diluted through water absorption by removing water therefrom.The antifreezing liquid containing water is introduced into an evaporation vessel. The liquid is then heated to a temperature at which components other than alcohol of the liquid are unlikely to be affected in their properties while air is fed thereinto. Thus alcohol and water vapors are generated. These vapors are first cooled to a temperature at which only water is condensed. After water is removed, cooling is effected at a lower temperature. At this stage, the alcohol vapor is condensed, and thus concentrated alcohol, almost water-free, is collected.The alcohol thus collected and nonfreezing and high boiling-point components other than alcohol in the evaporation vessel are again mixed into a concentrated antifreezing liquid.

Abstract: A method of freezing foods which comprises the step of cooling a heat transfer device having an open top, and the step of bringing articles to be frozen in contact with one surface of the heat transfer device through a layer of brine and keeping the articles in such contact relation. Freezing of the articles progresses only from their respective portions at which they are in contact with the brine.

Abstract: A heat exchanger according to the present invention is provided with bayonet tubes in its shell. One end of each of bayonet tube outer ducts is secured to and open at a tube sheet fixed at one end of the shell. One end of each of bayonet tube inner ducts is secured to and opened to a hot gas separation chamber. The other ends of inner and outer duct communicate with each other. A hot gas separation chamber is provided inside the tube side pressure drum which is attached to and in contact with the tube sheet. Such construction of a heat exchanger according to the invention as this prevents thermal stress from arising, rendering the design of economical and reliable heat exchangers possible.