Structure and principle of beer brewing brewhouse rice tun
Rice tun in the beer brewing brewhouse
The function of the rice tun is to mix rice flour and part of the malt powder with water to boil, and to heat up the mash to make the starch liquefy and gelatinize.
(1) The structure of the rice tun
The body of the rice tun is cylindrical, the bottom of the rice tun is a spherical or ellipsoidal interlayer, and the top cover is butterfly-shaped. There is a stirrer in the country, a heating device at the bottom of the rice tun, and an insulation layer on the outside of the rice tun. The crushed rice noodles, malt powder and hot water are mixed by the lower powder cylinder and the water inlet pipe and then sent in. With the aid of the propeller stirrer, the concentration and temperature of the viscous mash are uniform, so that the mash is more The heavy particles are suspended without sinking to the wall of the rice tun to form a "crust" to prevent local overheating of the mash near the heat transfer surface.
In order to evenly distribute the heating steam, there is a steam inlet communicating with the steam jacket with 4 short pipes. The steam pressure is 0.3～0.6MPa. The steam condensate is drawn from the condensate pipe, and the non-condensable gas is non-condensable from the steam jacket. The trachea is discharged intermittently with a valve. There is an insulation layer outside the steam jacket of the rice tun. The rice tun cover is equipped with a population double sliding door, a powder tube and an annular water washing pipe. The top of the pot cover is equipped with a steam rising pipe, and the bottom of the steam rising pipe has an annular groove to collect the condensed sewage flowing down the steam rising pipe wall and drain it from the condensed sewage pipe. To the ditch. The root of the riser pipe is also equipped with an exhaust damper, which can be adjusted to open and close according to needs. The top of the riser pipe is equipped with a cylindrical hood to prevent the entry of birds and the overturning of the tank in wind and rain.
The material of the mash tun is generally made of stainless steel to ensure the quality of beer. The inner bottom of the heating jacket should be made of copper plate, because the copper plate has a good heat transfer effect, and the outer bottom of the jacket can be made of ordinary carbon steel plate. The weld on the inner surface of the lid, the body and the bottom of the tun should be smoothed and polished, and treated with corrosion-resistant acid passivation. The exposed surface is polished, and there should be no bruises or scratches.
The arc-shaped bottom of the pot has an impact on the fluid circulation. Since the liquid column h2 near the inclined wall of the bottom of the pot is lower, the heated area ƒ2 is larger, while the central part of the liquid column h1 is deeper and the heating area ƒ1 is smaller, that is, the edge unit volume of liquid The heating area is larger than the center, causing the density of the liquid near the bottom of the pot to be less dense than the center. In this way, bubbles are generated around the bottom of the pot faster, forming a natural circulation of the surrounding liquid upwards and important liquid downwards. Under the same conditions, the mixing power consumption is only 60% of that of the pan, and the ball-shaped bottom of the pan also has the advantage of being easy to clean. Therefore, the bottoms of the gelatinization pot, the saccharification pot and the boiling pot are mostly made into a spherical or oval shape.
The agitator of the rice tun mostly adopts a two-blade propeller type, and the rotation angle can be 45° or 60°. The axial thrust can be generated to promote the circulation and mixing of the mash. The speed of the stirrer generally has two gears, one gear is fast (30-40 r/min) for mixing water and raw materials; the other gear is slow (6-8 r/min) for heating and holding the mash. Stirring to prevent the solids of the raw material from depositing and bottoming.
(2) Related parameters
①The capacity of the rice tun is smaller than that of the mash tun and the wort boiling pot. Its capacity is determined by the amount of raw materials added, and the effective capacity coefficient is 58% to 60%. Add water (400~450kg) for every 100kg of feed (including rice flour and malt powder), the capacity of the gelatinization pot is 0.5~0.55m3, and its effective volume should be calculated 500min below the manhole door. Recently, large-scale factories have adopted gelatinizers and mash tun with the same specifications, so that they can be used with each other and make production and deployment convenient.
②In order to facilitate the circulation of the liquid and a larger heating area, the ratio of the diameter of the rice tun to the height of the cylinder is 2:1, and the area of the riser pipe is 1/50～1/30 of the liquid evaporation area. Generally, the heating rate is not Below 1.5°C/min.
Volume: 1 time larger than the gelatinization pot, the filling factor is 0.7, and the heat transfer area is smaller than that of the rice tun.
The saccharification pot is a container with a cylindrical body, a slightly tapered interlayer and a curved top cover. In order to keep the mash at a certain temperature in the pot, most of the domestically designed mashing pots are equipped with a jacket at the bottom to keep hot water or steam for heat preservation, and at the same time to keep the concentration and temperature of the mash uniform.
Near the bottom of the pot, there is a paddle agitator to rotate. The agitator is directly driven to rotate by a motor through a vertical turbine reducer. There are 2 discharge valves under the bottom of the pot, which can send the mash to the rice tun and filter separately. groove.There are two sliding manhole doors on the lid of the pot, one double sliding door with holes, and one single sliding door with manholes, which are both a viewing hole and a manhole. The top of the pot cover is equipped with an exhaust pipe, and the root of the exhaust pipe has a waved groove. The condensate left along the wall of the exhaust pipe is collected and drained out of the rice tun by the condensing pipe. The root is also equipped with an exhaust hole door. Adjust it according to needs. Degree of opening and closing. There is a hood on the top to prevent the entry of birds and the ingress of wind and rain, and a down-wind tube is installed on the lid of the rice tun. In order to prevent the dust from rising, the powder lowering cylinder device has hot and cold water entering at the same time when the powder is loaded. The rice tun cover is also equipped with a pressure thermometer and a lighting lamp, and is equipped with a mash outlet.
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