SU1239484A1 - Unit for freezing foodstuffs - Google Patents

Description

The invention relates to refrigeration processing equipment, namely, installations for freezing food products by chemical contact with solid carbon dioxide.

The purpose of the invention is to increase the productivity of the plant by intensifying the process of heat exchange between the product and the refrigerant.

This is ensured by supercooling carbon dioxide in a liquid state before being fed into the mixing chamber and the stage dries out and, after blowing supercooling, solid carbon dioxide affecting the product by supplying the installation with pipelines and nozzles to supply liquid nitrogen to the spray gun and positioning one of the sections said pipeline in thermal contact with a portion of the pipeline for flow; liquid carbon dioxide.

FIG. 1 shows an arrangement for freezing foodstuffs; in fig. 2 - refrigerant supply unit, section.

The installation for freezing food products includes a heat-insulated casing 1, the working volume of which is divided into two compartments corresponding to the freezing zone of the product and the zone of its temperature. Through both about 9 tons of conveyor 2 for transporting the product, driven by electric drive 3. In the freezing section, there are 4 splitting chambers with nozzles 5 and b, each of which is equipped with pipelines 7 to 8 for supplying liquid carbon dioxide and liquid nitrogen respectively , moreover, these pipelines have sections 9 and 10 mutual heat

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contact for pre-cooling liquid carbon dioxide with liquid nitrogen. An exhaust device 11 is installed in the exit zone of the conveyor 2 from the temperature temperature compartment to suck the gas mixture of refrigerants and discharge it into the atmosphere.

Installation for freezing food works as follows.

When moving liquid chla: reactants through pipelines 7 and 8 in section 9, carbon dioxide is preliminarily cooled to the temperature at which the liquid state is maintained due to thermal contact with section 10 of pipeline 8 for supplying liquid nitrogen. Next, liquid carbon dioxide is throttled through the nozzles 5 to form a solid fine fraction, to preserve and overcool it and reduce the formation of carbon dioxide vapor to the spray chamber 4 through the nozzles 6 liquid nitrogen is sprayed. Formed in, chambers 4, the mixture of finely dispersed solid COj - NJ vapors enters the freezing zone of the product and actively interacts with it, from where the latter is conveyed to conveyor 2 in the refrigerant vapors through the conveyor 2.

The productivity of the proposed plant increases due to the maximum use of the potential cold of carbon dioxide: by obtaining its solid fraction from the total amount of the throttled liquid and increasing the total heat transfer coefficient between the product and the refrigerant, which intensifies the heat exchange process.

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777-GGGGT / / / / I 1 A

Compiled by V. Chanturi Editor N. Tupitsa Tehred O. Gortvay Proofreaders. Bug Ha

Order 3382/38 Circulation 482Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

FIG. 2

Claims (1)

INSTALLATION FOR FREEZING FOOD PRODUCTS, including a heat-insulated casing, pipelines for supplying liquid carbon dioxide, each of which has a refrigerated section, nozzles installed at the ends of pipelines and placed in the spray chambers, and a conveyor for moving the product, characterized in that, in order to increase productivity by intensifying the heat transfer process, it is equipped with pipelines with nozzles for supplying liquid nitrogen to the atomization chamber for mixing with _β carbon dioxide and its transfer cooling, at 5S, one of the sections of these pipelines has thermal contact with the cooled section of each pipeline to supply liquid carbon dioxide. Bf With