Heat exchanger for the continuous sterilizer (Holding Spiral Heat exchanger )

Heat exchanger for the continuous sterilizer (Holding Spiral)

Outline

In the food processing, heat sterilization is carried out by final process in order to prevent the alteration by putrefaction, etc..

Then, it is made to flow into the heat exchanger, and it is made to rise to the fixed temperature in liquids with juice, sake, beer, seasoning and protein and grape sugar, etc. in the short time, and the continuous sterilisation ,that retains and sterilizes it in fixed time ( 1-a few minutes ), is carried out.

The importance increases more and more on these continuous sterilization operation by the progress of the biotechnology.

As this continuous fluid maintenance container, the holding tube was used until now.

However, the equipment volume was big, and it was disadvantageous that the cost of the heat insulation work became enormous.

That is to say, the frame which supports many pipes is required, even if the watercourse length becomes an enormous thing, because large number of pipes are connected in the holding tube, and because the long watercourse has been ensured, and even if it is made to turn in the elbow, and equipment arrangement of the whole sterilization unit becomes difficult.

And, not only the heat insulation work for the exterior of the long pipe needed the enormous cost, but also construction periods did be also necessary in the long term.

The holding spiral was developed on the basis of the spiral heat exchanger as continuous sterilized container in the high temperature.

The spiral watercourse there is no the useless space like the holding tube between watercourse and watercourse, and occupying bulk of the equipment decreases by far.

And, the exterior decreases in comparison with the holding tube, since most watercourse is being stored in the container inside, very much, and price and delivery date of the heat insulation work can be drastically saved.

(The Japan country patent has been accepted this holding spiral.)

Construction


The holding spiral was developed on the basis of spiral heat exchanger which our company was in the long time maker and seller.


The outline drawing is shown in fig.2, and the inside basis structure is shown in fig.3.

The holding spiral spirally wound the metal plate of 2 sheets in the fact figure, and two watercourses were formed, and the two watercourses were tied in the circumference, and the long and single watercourse was formed ( volute ).

The fluid flows in basing the nozzle installed for the bottom cover, it passes through spiral A watercourse composed of spiral plate and bottom cover, and it flows from the central part to the periphery.


Then, in the periphery, it already flows into the other B watercourse, and the A watercourse returns to the central part reverse-directional, and it escapes from the nozzle installed in the head cover.

(The B watercourse has been composed of spiral plate and head cover as well as the A watercourse.)

A and B two watercourses of the holding spiral are all welded structure, and they have perfectly separated except for the linkage of the periphery, and fixed watercourse length, namely the residence time, has been ensured.

There are no dead space such as the air accumulation, because the fluid flows from the nozzle of the bottom cover, and because it is the simple structure of the runoff from the nozzle of the head cover, and it is possible that it can perfectly carry out discharge of the liquid and substitution by the water and prevents the putrefaction of the residual fluid.

Usual davit-pipe in the holding spiral has been installed, and it is put for regal inspection of first-kind pressure vessel, etc. in ( inside inspection of once a year ), the flat plate of top and bottom can be easily decomposed.

The holding spiral has the excellent advantage which the holding tube does not contain by the above structure as a continuum fluid retainer.