What changes happen when craft beer is boiled, explained by senior brewers one by one
What changes happen when craft beer is boiled, explained by senior brewers one by one
24/04/2022

Detailed introduction of the working principle of beer equipment gelatinization pot

The function of the gelatinization pot of the brewery equipment is to mix rice flour and part of the malt powder with water to boil, and to heat the mash to liquefy and gelatinize the starch.

(1) The  beer structure of the gelatinization pot

The structure of the gelatinization pot is shown in the figure below. The body of the pot is cylindrical, the bottom of the pot is a spherical or ellipsoid interlayer, the top cover is butterfly-shaped, a stirrer is installed in the country, a heating device is installed at the bottom of the pot, and an insulating layer is provided on the outside of the pot. . The pulverized rice flour, malt powder and hot water are mixed evenly by the lower powder drum and the water inlet pipe, and then fed with the help of the propeller agitator to make the concentration and temperature of the viscous mash uniform, so that the mash is relatively thick. The heavy particles are suspended without settling to the pot wall to form a “bath of the pot” to prevent local overheating of the mash near the heat transfer surface.

Detailed introduction of the working principle of beer equipment gelatinization pot

 In order to evenly distribute the heating steam, there is a steam inlet connected with the steam jacket by 4 short pipes. The steam pressure is 0.3-0.6MPa. The trachea valve is intermittently released. There is a thermal insulation layer outside the steam jacket of the gelatinization pot. The lid is provided with a double sliding door, a lower powder drum and an annular washing pipe. The top of the lid is provided with a steam riser, and the bottom of the steam riser is provided with an annular groove to collect the condensed sewage flowing down the wall of the steam riser and drain it from the condensed sewage pipe. to the ditch. There is also an exhaust air valve at the root of the steam riser, and its opening and closing degree can be adjusted according to needs. There is a cylindrical hood on the top of the steam riser to prevent birds from entering and pouring the tank in the wind and rain.

Detailed introduction of the working principle of beer equipment gelatinization pot

Gelatinization pot stirrer mostly adopts two-blade propeller type, and the rotation angle can be selected as 45° or 60°. The axial thrust can promote the circulation and good mixing of mash. The speed of the stirrer generally has two gears, the first gear is fast (30-40 r/min) for stirring and mixing water and raw materials; the first gear is slow (6-8 r/min) for heating and keeping the mash. Agitate to prevent raw material solids from settling and bottoming.

Detailed introduction of the working principle of beer equipment gelatinization pot
 (2) Related parameters of beer gelatinization pot

①The capacity of the gelatinization pot is smaller than that of the mashing pot and the wort boiling pot. Its capacity depends on the amount of raw materials added, and the effective capacity coefficient is 58% to 60%. Add water (400-450kg) to every 100kg of feed (including rice flour and malt powder), the capacity of the gelatinizing pot is 0.5-0.55m3, and its effective volume should be calculated 500min below the manhole door. Recently, large-scale breweries have adopted the same specifications of gelatinization pot and saccharification pot, so as to be common to each other and make production and deployment convenient.

② In order to facilitate the circulation of the liquid and a larger heating area, the ratio of the diameter of the gelatinization pot to the height of the cylinder is 2:1, and the area of ​​the gas riser is 1/50 to 1/30 of the liquid evaporation area. Below 1.5°C/min.