CS243841B1 - Cylindrical cold tank for brewing and other fermentation industries - Google Patents

Abstract

The device relates to a cylindrically-conical fermentation tank for the brewing and other fermentation industries, which is made of clad sheets, with the inner layer being a stainless steel sheet and the outer layer being a carbon steel sheet.

Description

(54) Cylindroconic tank for cold operations in the brewing and other fermentation industries

The device relates to a cylindroconical fermentation tank for the brewing and other fermentation industries, which is made of clad sheets, the inner layer being of stainless steel and the outer layer of a carbon steel sheet.

The invention relates to cylindrical-conical tanks for cold plants in the brewing and other fermentation industries, in which direct evaporation of NH3, indirect cooling can be used, or can be produced - for the next stage of the fermentation process - without heat transfer surfaces.

Cylindroconical tanks are currently made of high quality, expensive, non-rusting materials, sheets. The inner surface of the containers is ground, smoothed and polished to make the yeast and sediment detachment as easy as possible.

Therefore, the choice of starting stainless steel materials, large sheet metal sheets containing tens of percent chromium and nickel is fully justified. This is all the more so when today the required automated machine washing works with pressures of up to seven or more megapascals, with hot caustic concentrations of three percent, with acids of similar properties, including nitric acid, with intensive rinses with water and disinfectants.

It would surely be possible to produce an Eylindrocone tank with a diameter of, for example, 4.35 meters, a height of 17, 22 and more meters, with contents of 200 m, 250 m or more of unalloyed structural steel. Then protect the interior surface with smooth coatings that would be suitable for a variety of food applications, including enamels, if such a large enamel kiln were available.

Galvanic or chemical nickel plating and chromium plating also offer little guarantee * of equipment life. In addition, thousands of millimeters of thin protective layer of these metals do not obscure any and random scratches and almost invisible unevenness of the surface, which would still have to be ground and polished.

The surfaces must be able to withstand the potential of hydrogen ions: the pH varies between 5.5 and 6. The production of the existing stainless steel cylindrical conical tanks utilizes stainless steel, about six millimeters thick, welded from a large number of small-sized sheets into the required large unit.

The cylindrical part of the cylindrical-conical tank (of the cooled type) produced therefrom is externally. Welded - made of stainless steel half-pipes or similar U or L profiles produced - heat-exchange, duplicate surfaces;

The coolant passing through, i.e. in this case the secondary coolant, brine * glycol, dissipates the heat generated by the fermentation. This refrigerant has a low pressure, the welds of the duplicate profiles may - as prescribed - cross the welds of the cylindrical part made of said large number of small panes.

However, an economical thirty percent ellum must not be used for crossing welds. energy saving cooling by direct evaporation of NH4. And thin, about six millimeters thick, cost-effective, stainless steel sheets, at the necessary crossings of large-size exuding avars, for example 2 x 7 or 2 x 14 meters cannot be produced: for high percentages of alloying additives / rapid cooling of nature, even with numerous intermediate heating to 1350 ° C. There is an enormous increase in deformation work and pressures on rolling mills, which are beyond the possibilities of contemporary rolling technology. .

The above disadvantages are overcome by the construction of cylindrical-conical tanks according to the invention, which consists in that they are made of clad sheets, the inner layer being a stainless steel sheet and the outer layer being a structural steel sheet.

The advantages of cylindrical-conical tanks constructed according to the invention are that from a given, strictly balanced and allocated amount of expensive stainless steel, it is possible to produce even three times more cylindrical conical tanks, to satisfy three times more, also foreign customers, to increase the planned profit proportionally.

Further advantages are the possibility of using direct evaporation of NH3, thereby reducing operating and poring costs. By using the cheaper starting material, large-format clad sheets, up to one tenth reduce the lengths of welds required, thereby reducing manufacturing effort, compared to using a comparable amount of small, all-stainless sheets of sheets used to make a comparable tank.

An example of a specific embodiment of a 200 m ³ cylindrical conical tank according to the invention:

The cylindrical part has an inner diameter of 4,350 mm, a height of 14,000 mm. th. walls 8 + 2 mm. Depending on the purpose and use of the tank, the outer cylindrical portion may be provided with heat transfer surfaces. Wall thicknesses will result from static calculations, possibly refined by tensometric measurements.

The conical lower part of the 2,400 mm tank can be made of the same clad material, ie 8 millimeter carbon steel with 2 millimeter internal stainless steel cladding. The conical canopy of a container height of, for example, 1,400 mm can be made similarly.

Container Equipped with appropriate equipment to provide required functions and protection. The cylindrical-conical tank will also be insulated according to its purpose, preferably with polyurethane with an external rinsing surface.

The exact price comparison will be expected to halve the price, with indirect cooling about the construction of various designs.

Claims (1)

OBJECT OF THE INVENTION Cylindro-conical tank for cold plants in the brewing and other fermentation industries, characterized in that it is made of clad sheets, the inner layer being of stainless steel and the outer layer of carbon steel.