Abstract: This paper analyzes the three mildew phenomena commonly caused by pellet feed from the production, storage and transportation links, and summarizes the close relationship between the mildew of pellet feed and the cooling, storage and transportation of pellet feed.
In the process of handling the mildew complaints of feed, it was found that there were several complaints about mildew phenomenon, which were manifested as: a large number of single-grain mildew, agglomerated mildew, massive mold, and uniform mildew.
The first type: part or whole bag of feed is a large number of single-grain mildewed feed, sometimes there are some small that are glued together by several mildewed feeds, the feed in the bag is hot and has a musty smell;
The second type: there is a group of moldy feed at the seam of the feed bag. There are usually a few bags in the feed, sometimes there are sporadic mildewed single-grain feeds around it;
The third type: the top layer of the feed storage pile on the sunshine side, there is a piece of moldy feed, and the quantity is large, there are scattered single-grain feed around the ;
The fourth type: the whole package from the inside to the outside, uniform mildew.
A large number of single-grain mildew
mildew
mildew
Reason analysis
When the feed factory analyzes the mildew phenomenon of these feeds, it generally goes to the quality control department to understand the moisture of the batch products. However, most of the results are that the finished product moisture does not exceed the standard (≤12.5%). After summarizing and analyzing, The following conclusions are drawn:
01 A large number of single-grain mildew feed causes;
a. In the case where the moisture of the finished product does not exceed the standard, the insufficient cooling of the pellet feed in the cooling tower is the main reason for the large number of single-grain mildew feeds. Since the pellet feed is not sufficiently cooled in the cooling tower, after the hot pellet feed leaves the cooling tower, when it comes into contact with the outside low temperature air, the hot and cold air contacts the surface of the particle, and the temperature difference causes the hot air emitted from the pellet to condense on the surface of the particle. , causing the surface moisture of the pellet feed to rise (so that the surface moisture of the pellet is larger than the average moisture of the pellet, exceeding the standard), the greater the temperature difference between the hot pellet feed and the outside air, the higher the surface moisture of the pellet feed; the particles with high moisture stick together and form a small Hey, after a period of time, the pellets with high surface moisture will quickly become hot and mildew under the action of mold, and the musty smell will be emitted; the higher the storage environment temperature of the batch, the faster the mildew will be.
b. The steam water is not cleaned when the turned on, resulting in too high moisture content of the starting material. The granulator does not find it, and then mixes it with the normal material.
c. The material of the bulking material or the drying of a certain section of material is not . The found in the expansion chemical, but it is not treated as a non-conforming product, and it is mixed into the normal product.
d. Leakage on the side of the drying net or at both ends, resulting in a very small part of the particles coming out of the drying box early.
02 The cause of the moldy mildew feed at the seam;
Agglomerated moldy feed is generally caused by rain or dampness.
a. Rainwater wet
Whether during storage or transportation, rainwater enters the bag from the seam line, causing the bag mouth pellets to inhale more water, some of the particles are melted, 0 in the wet feed and in the bag or outside the bag. Under the circumstance, a high-moisture feed group is formed, and after a period of time, the mold in the high-moisturized stalk feed is multiplied to form a moldy feed group.
b. dampness
Due to the high humidity in the air at the place where the feed is stored (especially during the rainy season in the first half of the year in the south), moist air enters the bag from the seam line and comes into contact with the feed, causing the moisture in the pellets at the mouth of the bag to rise; sometimes in humid air. Moisture is even transmitted to the pelletized pellets through the seam line, which also increases the moisture content of the pellets at the mouth of the bag. The longer the pellet feed is placed in such a humid environment, the more the pellet feed absorbs the water. Under certain circumstances, some of the pellets melt, forming under the bonding of the wet feed and the extrusion of the bag or the feed outside the bag. The high-moisture feed group, after a period of time, the mold in the high-moisture pellet feed multiplies, forming a moldy feed mass.
03 Causes of blocky mildew feed;
In the strong sunshine, the top layer of the feed storage (transport vehicle) and the sunshine side, the pellet feed under strong sunlight, the water in the pellet feed is evaporated at high temperature, forming water on the inner membrane. Fog, especially when the sun-dried pellet feed enters a low temperature environment (in the daytime into the evening or transporting the feed to the room), the hot and cold air contacts the inner membrane, and the temperature difference causes the hot air in the bag to condense to form a water mist and a water mist. Will directly stick to the feed, causing the local pellet feed moisture to increase. After a period of time, the water is high and the feed heats up, and becomes a loose grain moldy feed; in severe cases, too much water mist will form water droplets, which will stick together the surrounding pellet feed. Blocky, over time, blocky high-moisture feed heat, mildew, forming a blocky moldy feed;
Sun-induced test for increased moisture content of local pellets:
a, a bag of feed, moisture 11.5%, 700g, ∮ 3mm, basically sealed.
b, there is water mist
c. After drying for 1 hour in the sunset (starting at 4:00 pm, outdoor at 37 °C).
Take indoors (about 25 ° C, water mist is obviously aggravated)
Reason analysis
1, 10-13% of the water in the pellet feed, the water will evaporate at high temperature, forming a water mist on the inner membrane;
2, the sun-heated feed into the house (or low temperature), hot and cold air contact on the inner membrane, the temperature difference causes the hot air in the bag to condense, causing the water mist to increase, forming water droplets.
Solution
1. Prevent the occurrence of a large number of single-grain mildewed feeds, mainly to ensure that the pellet feed is sufficiently cooled to ensure that the temperature of all pellets under the cooling tower is not greater than the ambient temperature of 5 °C. The solution that can be taken is;
A. Adjust the cooling tower to a reasonable height;
B. Adjust the cooling tower distributor and unloader to maintain the basic level of the layer of the cooling tower;
C, equipped with appropriate specifications of the cooling tower, cooling fan and reasonable control of the size of the fan damper;
D. Strengthen the drainage confirmation person, confirm with the squad leader, after normal, before use; or quickly test (5 minutes) after quenching and tempering semi-finished product moisture, confirm normal and then put into normal production.
2, to prevent the occurrence of agglomerated moldy feed at the seam, the general feed mill label made a very clear description, the method is as follows;
A, anti-rain, water, moisture absorption;
B. Stored in a ventilated, dry and clean place;
Prevent the occurrence of massive moldy feed, mainly stored feed products can not be exposed to the sun. In addition, the vehicle transports bagged feed in high temperature and strong sunshine, especially when the transportation distance is relatively long.
Article source: Tianmuhu Forum official website
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