Discusses the factors and practical operation of filter beer by plate diatomite filter
At present.The commonly used diatomite filter has three types: plate frame filter, leaf filter and candle filter.:
Its main features:
1.Simple structure, stable performance, low maintenance cost, long service life;
2.The filtration efficiency is high, and the filtration capacity can be improved by increasing the filter plate frame, which is fast and convenient.High filtering precision, with the fine filter, can obtain a satisfactory degree of clarification.
Selection of paper wrench:
Board, also known as coated board, supporting paper, its quality is important factor in determining the quality of its using frequency and filter at present, the quality of domestic board has a larger extent, from the point of usage, smooth appearance, thickness, edge neat. Tu limb homogeneous board use effect is good.
Selection of diatomite filter aid:
Diatomite filter aid is actually a pure amorphous porous silicon with stable chemical properties, which is harmful to human body and has no influence on the flavor of beer.High filtration precision and proper filtration speed can be obtained by selecting diatomite filter AIDS with uniform particle size distribution, strong adsorption and stable technical indexes.
Effect of precoating on filtering effect:
Before beer is filtered, the operation of depositing an effective filter aid on the supporting board is called precleaning.The purpose of precoating is to prevent impurity particles from clogging the board and to provide a satisfactory degree of clarification from the beginning of filtration.Knead precoating amount is larger, the degree of effect, the better the higher the slag, wine clarification, but precoat amount is too large, will inevitably affect the amount of adding filter aid, cause the filter cycle is shorten, the filter liquor volume decreases, therefore, reasonable beforehand coating, coating amount and ratio of fine soil is very important.
The first layer of the precoating should use jacaranda, which can support the second layer, so as to avoid fine soil into the deep space of the paper lever.After the first layer of circulating water is clear, apply the second layer.The second layer is precoated with a mixture of thick and thin diatomite additives (the ratio of thickness to fineness is generally 1:1) to form an efficient filtration layer and effectively retain suspended particles and colloidal impurities.
The thickness of the precoating is generally about 3mm, and the precoating time is about 20 minutes.Precoating velocity shoulds not be too fast, lest cause bubbles make the uneven coating, coating after the usable water continues to 5-1 o minutes, make the coating more strong adsorption, is advantageous to the extension of the filtration cycle.
Effect of adding method and amount on filtering effect:
In the process of filter liquor, according to the scene to filter liquid contains floating particles and the concentration of the colloidal impurities, nature, according to certain ratio down even to stay adding diatomite filter liquid fertilizer operations as addition agent its role is to make the filter aid particles and ketone bodies, impurity particles mixed filtering agent, thus reducing the filter cake compression resistance, in addition, the widening "bridge structure, can improve the empty Du of filter cake, also have the effect of continuous updating of filter bed, make filter to maintain fast and stable, finally can improve the filter efficiency and cycle.
The addition of filter aid must be adequate to ensure high filtration precision and proper filtration speed.If the addition is too large, the frame will be filled too early, resulting in shorter filtration cycle and less total filtration.If the amount of addition is insufficient, the resistance will increase, the pressure will increase rapidly, resulting in the reduction of filtration efficiency, and even the service life of the shadow cardboard.
As a result, the proportion of adding additives and quantity must be according to the concentration of impurity particles in liquid adjust at any time, only in this way can both by alcohol, and extend the filter liquor cycle, increase the amount of filter liquor, add the cardboard usage.