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There are two main aspects of boll germination process.
Regulate temperature and humidity of wheat layer, supply fresh air and remove carbon dioxide during germination of boxes. To achieve above goals, ventilation facilities must meet following requirements:
1. The air inside and outside germination room can be mixed in proportion;
2. There are conditions for heating or cooling air, and you can also adjust air temperature;
3. There is a spray humidification device;
4. There is a certain air pressure and air volume, and air supply volume can be adjusted arbitrarily.
In a real production process, different stages of germination have different ventilation requirements, for example:
1-2 days after harvest, medicine will be distributed.
In order for malt to enter intensive germination stage, air temperature must not be too low (eg 13-15 ℃) and a certain relative humidity must be maintained (eg above 85%). frequency of ventilation may be less.
3-5 days after wheat is laid, this is stage of active germination. At this time, respiration of wheat grains is strong, and main purpose of ventilation should be to remove heat and remove carbon dioxide. , Therefore, ventilation temperature should be lower (such as 12~14 ℃), number of ventilation should be more (such as 4~6 times/day).
In order to replenish moisture that is lost during germination, relative humidity of air must also be higher. Generally, fresh air no longer mixes or mixes at a very low proportion, number of ventilations decreases, and relative humidity of incoming air must be lower, sometimes even can be directed to dry wind, so that respiration and growth of wheat grains are inhibited, and roots and buds wither to achieve purpose of withering.
In addition, air temperature, air volume, ventilation time, inlet air relative humidity and fresh air proportion can also be adjusted according to specific conditions.
For example, if supply rate is low, more fresh air can be supplied. Increased moisture and higher wind temperatures in general can speed up germination.
In winter, temperature of wheat layer is high, and hot and humid air can be supplied to increase temperature of wheat layer;
In summer, temperature of wheat layer is high or degree of wheat soaking is high and germination is strong, and humid and cold air can be supplied to prevent temperature of wheat layer from being too high. high, causing heat, smell and affecting quality of the malt.
Stirring means turning over layer of wheat. This is an important operation for box germination to dissipate heat from wheat layer, loosen wheat layer, allow air to circulate, and avoid tangling wheat roots.
The mechanical agitation system must meet following requirements:
2. It can turn over malt layer of a certain thickness (for example, 0.6~1m) and buy a dead corner;
3. The lathe will not break wheat grains or flatten wheat grains, and layers of wheat will be pressed tightly.
The mixing operation has different requirements depending on stage of germination.
At beginning of germination, which is called accumulation growth stage, frequency of shaking should be less, usually 1-2 times a day. In active germination stage, wheat layer generates more heat and wheat roots grow rapidly. In order to improve heat dissipation and prevent wheat roots from becoming entangled, it is necessary to increase stirring up to 3-5 times a day.
The late stage of germination is wilting stage (also known as carbon dioxide accumulation). To suppress growth of malt, it is necessary to increase concentration of carbon dioxide in layer of wheat and number of times of mixing per day can be reduced to 1 or 2 times.
In addition, shuffling operation must also be performed flexibly. For example, if it is found that wheat layer is hardened and temperature of wheat layer is too high, it means that germination is too strong. stir several times, or even continuously. To increase accumulation and heat, you need to stir less.
In addition to two main operations of ventilation and agitation, crate germination also includes operations such as temperature measurement, water spraying, and temperature and humidity control in germination room.