Energy-saving control of feed mill dust (mainly closed, supplemented by air suction)

Dust prevention is the focus of safety production and environmental protection in feed plants. Many links of feed production will produce dust, such as material transportation. Crushing, mixing, screening, packaging, etc. When dust and air reach a certain concentration, it will cause a dust explosion when encountering open fire. People are in an environment containing a lot of dust for a long time, which will seriously affect their health. If the dust falls on the equipment, it will cause the failure of electrical equipment and cause accidents. Therefore, the seasoning plant must take measures to control dust.

The important principle of dust control in the feed plant is "airtightness first, air suction second". First, the machines and equipment that generate dust should be as airtight as possible, and then the dust removal air network should be designed and arranged at appropriate positions. Select the type of dust removal equipment. After normal operation, the dedusting equipment shall be regularly maintained to ensure its good operation.

At present, feed mills mostly adopt separation. Dynamic dust remover and bag-type dust remover. Centrifugal dust remover uses centrifugal force to separate the powder in the high-speed mixed airflow from the dusty air to achieve the purpose of dust removal. It is simple to make and has high separation efficiency. In order to improve dust removal efficiency, feed mills often use two or four centrifugal precipitators of the same size in parallel. At this time, their capacity is the sum of the capacity of the standby centrifugal precipitators. Bag-type dust remover is purification equipment that uses organic fiber, inorganic fiber, and the attached dust layer to filter the dust in the gas. High dedusting efficiency, no corrosion. However, due to its large volume and high equipment investment, it is easy to crust and block when handling wet dust, and its filter cartridge needs regular maintenance and replacement.

In order to effectively control the spread of dust, dust removal points must be selected at the places where dust is most likely to be generated.

Feeding port: dust is easy to be generated in the feeding process. One pulse dust remover can be set at each feeding port, and the dust cover at the feeding port is directly set. In this way, it can be used not only as the feeding dust suction but also as the suction of the base part of the feeding elevator to achieve the effect of moving forward the material and removing dust at the same time.

At the pulverizer: usually, the outlet of the pulverizer is connected with the material seal flowers, and the reverse of the material seal auger is equipped with a pulse dust remover, which can realize the air suction and dust removal of the pulverizer at the same time.

Small material adding place: small material is not easy to participate in automatic batching due to its small amount, so it needs to be added separately in the production process. This dust is special. The point is that the particle size is fine and easy to raise dust, so the small fodder feeder (SBLMa4 type) produced by sheep can be used, which can not only add small fodder but also solve the problem of dust leakage, effectively ensuring the quality of feed products.

Silo group: various silos of large and medium-sized feed plants are relatively high, and the materials are easy to fly when entering the silo, so negative pressure facilities should be set for treatment. For the combined silo group, the rising dust can be collected through one or two dust suction points through the connection at the upper part of the silo. The general practice is to set one point in the bin to be crushed, two points in the batching bin, one point in the bin to be granulated, and one point in the finished product bin, which are combined into their respective dedusting air networks. The air suction volume can be determined according to the size of the silo, and then the pulse dust remover can be configured. When using this method for dust control, it is necessary to ensure that there is material in all batching bins, otherwise, the accuracy of batching scales will be affected.

Other places: In terms of raw material cleaning and finished product packaging, air suction points shall also be designed as required and incorporated into the combined air network.

Each dust suction point shall reach a certain air suction volume and wind speed. When the air suction volume is fixed, the larger the suction port, the smaller the wind speed, and the smaller the suction port, the greater the wind speed. There is a certain range of air volume and wind speed required for each dust suction point. The air volume shall be reduced as much as possible under the condition of dust control. Wind speed reduces energy consumption and prevents the room from forming a vacuum. When designing and installing equipment, control valves shall be installed at appropriate positions of each air suction pipe to adjust the air speed and air volume in the air duct.

Generally speaking, each feed processing workshop has a central dust remover. Some dust removal points are far away and the process route is long. Therefore, air ducts should be laid vertically as far as possible to reduce the number of bends and horizontal pipe sections and shorten the length of horizontal pipes to prevent the pipes from being blocked by accumulated dust. The pipe interface should prevent air leakage.

Design of independent air network: Independent air network should be used for high-concentration trace components. It should not be directly added to the formula feed but should be diluted and added in small proportions.

Arrangement of suction port: the suction port of the dust suction device should face the place where the most dust is generated. In order to avoid excessive materials being pumped out, the suction port should not be located near the area where the materials are in a state of agitation or in the airflow of powder materials.