SU1551947A1 - Method of producing dried malt extraction - Google Patents

Abstract

The invention relates to a technology and technique for producing dry food products and can be used in the brewing and food concentrates industry. The aim of the invention is to increase the intensity of the drying process. The malt extract is concentrated in a vacuum apparatus to a dry matter content of 70-80%, churned at 25-35 ° C in a rotary type foam generator with forced supply of nitrogen or air to a density of 600-800 kg / m ³ , dried and cooled by conductive method in valcelentochnoy the dryer with a layer thickness of 1-1.5 mm, dried for 3-5 minutes at a vapor pressure in the rolls of 1.5-2 atn, and cooled to 20-25 ° C. 1 il. 1 tab.

Description

The invention relates to a technology and technique for producing dry food products and can be used in the brewing and food concentrates industry.

The purpose of the invention is to increase the intensity of the drying process.

The drawing shows a flow chart for the production of a dry malt extract.

The method of obtaining dry malt extract is that malt extract with a solids content of 12% enters the vacuum unit 1, where it is concentrated to a solids content of 70-80%. The concentrated extract is fed by a piston metering pump to a foam generator 2 equipped with a cooling jacket. Foaming is carried out to a density of 600-800 kg / m 1 when compressed nitrogen or air is fed into the foam generator chamber, the flow of which is controlled by the flow regulator. When foaming, the product is cooled to 25-35CC by supplying ice water to the foam generator's jacket. In the foam generator, the product is whipped into a resistant fine foam, which then enters the drying in a wall — a target-based foam-drying unit 3. The foam is applied in an even thin layer onto an endless stainless ribbon that bends around two steam-heated rollers, guide rollers and a cooling roll. The vapor pressure in the rolls is 1.5-2.0 atm. The product, dried during the contact of the tape with the surface of the heating rollers, is further cooled to 20-25 ° C when the tape passes over the surface of the cooling roll and acquires a brittle structure, which makes it possible to remove it with a knife device. The resulting dry malt extract is characterized by high quality indicators, low hygroscopicity and good recoverability.

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Examples of dry malt extract production modes are given in the table.

As the analysis of the data in the table shows, the use of process modes, the parameters of which fall outside the recommended change limits, entails either a reduction in the quality indicators of the finished product or an increase in energy costs.

So, if a decrease in the product concentration below 70% solids causes an increase in the drying time and an increase in energy consumption due to the fact that the energy intensity of the drying process is higher than the evaporation process (example 1), then exceeding 80% concentration (example 2) entails excessive increase in viscosity of the extract, darkening, reducing the quality of the finished product. Reducing the temperature of the foam supplied and drying (example 3) and the temperature of the finished product (example 4) leads in the first case to uneven removal of moisture due to not Apply a good layer of foam to the tape, and in the second case to its moisture due to condensation of moisture when the product temperature drops below the dew point at standard air humidity in the room. The result of increasing these temperatures (examples 5 and 6) is not enough to dry the foam or insufficient product ridge at its removal When an excessive increase in the thickness of the layer of dried foam (example) occurs, the flow of the product from the tape occurs when it enters the drum, and when the thickness of the layer decreases to less than 1 mm ( ep 8) increases the percentage of product loss A decrease in foam density to kg / m1 (example 9) or its magnitude to kg / m (example 10) causes the foam structure to collapse when dried, which reduces the quality of the product and increases its adhesion to reduction of the vapor pressure in the rollers to P 1.5 atm dramatically reduces the intensity of drying (example 11), and as the pressure rises to atm (example 12), the product burns, its quality decreases

If the drying time is not in the specified time interval (3-5 minutes), the moisture content of the finished product, respectively, exceeds the required value (example 13), or the product dries out with a decrease in its quality (example 14)

Maintaining the parameters within the specified limits provides obtaining high quality dry malt extract with the lowest possible losses thought out and energy-consuming (examples 15--20), and

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The moisture content per square meter of drying surface per hour is 2.5-3 kg / m.

The main advantage of the method over the known one is the use of conductive drying, the intensity of which is 3-4 times higher than the convective one used in the known method. Such a technique allows shortening the drying time and energy consumption for its implementation.

The use of a conductive power supply when drying foamed malt extract imposes restrictions on the quality of the dried foam. It must be sufficiently resistant so that the foam structure of the product is maintained at intense moisture removal. At the same time, the foam must be sufficiently fluid so that it can be transported and applied evenly on the drying surface. The production of foam with qualitative indicators that meet these requirements is achieved by observing the recommended modes of the foaming process of the product at a specified concentration. Concentrating the malt extract to 70--80% dry matter, foaming to a density of 600-800 kg / m and cooling the product in the foaming process to 25 - 35 ° C allows to obtain a stable monodisperse foam, which is easily applied as a thin even layer and retains It has a foamy structure during intensive conductive drying. The need to cool the product during the foaming process is due to the fact that when foaming a viscous product in a rotary foam generator, heat is generated, which leads to an increase in the temperature of the product being foamed and a decrease in the quality of the foam.

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Claims (1)

Invention Formula The method of obtaining dry malt extract, including concentration, foaming, drying and cooling, characterized in that, in order to intensify the drying process, the concentration is carried out to a dry matter content of 70-80%. and foaming is carried out at 25-35 ° C in a rotary type foam generator with forced supply of nitrogen or air to it to a density of 600 - 0 800 kg / m, and dried and cooled by the conductive method in a roll-up dryer with a layer thickness of 1 -1.5 mm, while the step is within 3-5 minutes at a steam pressure in the mill 1.5-2 atm. and cooled to 20-25 ° C. 165256001,5,05,525 285256001,52,04,025 370206001,51,83,520 475306001,51,83,515 570406001,51,83,520 680357001,52,05,030 770-86002,02,04,520 875306000,51,53,025 980304001,51,54,022 1080309001,52,06.025 1180256001,51,28,025 1280357001,52,53,025 1380306501,52,02,522 1475 25 600 1.5 2.0 5.5 25 1575 30 600 1.5 2.0 3.5 25 1680307001,52,05,025 1780306501,52,04,022 1875256001,52,03,525 1975256001,01,53,025 2080308001,01,83,025 The powder is somewhat darkened, has a bitter taste. The product is dark, excessively viscous, poorly pumped, no good foam is obtained, the finished product is dark. The foam is poorly applied to the tape, the applied layer is uneven, with potholes; uneven drying is observed in the topographic layers. Condensation is observed on the infidelity of the cooling roll, some finished product is removed when cooled. The foam is coarse, quickly collapses during drying, there is a strong adhesion, the product is poorly removed. The dry product is not sufficiently brittle, crumpled, removed. The foam flows from the belt as it enters ICH i et on the drum. Drying proceeds well, high quality shock, the percentage of residual on the tape exceeds the allowable. There is a destruction of the highly dispersed foam when drying, greater adhesion, they are (the residue of the product on the tape is polydisprescent, it is not durable. large adhesion Humidity of the product exceeds the permissible value and, the percentage of the product residue on the ribbon is ve / ic. The product is over dried, dark at night. bitterness The product is undersaturated, withdrawn in the form of chots, the percentage of the remainder on the tape is prefixed The powder is darkened, has a prpvk from the Gene Gene dries well, evenly, npjn-KT is well removed, high quality indicators Drying proceeds satisfactorily, high quality porosity, OLTST on the tape does not exceed the PERMISSIBLE Drying proceeds satisfactorily, high quality powder, the percentage of losses does not exceed the norm Drying is uniform, high quality Drying proceeds normally, the powder you eye quality Drying proceeds normally, high quality powder