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HOME >> NEWS >> Introduction of Steel Silo for Feed Material Storage

For storage of raw materials and finished products are mainly large steel silo and Li-room Silo (also known as Silo). Room type large silo low cost, easy to build, suitable for powder, refined oil and meal packages. Small varieties of expensive additives raw materials needed to be managed by someone with a specific small-room warehouse. WAREHOUSE drawback is the low level of mechanization of loading and unloading work, labor-intensive, operations management more difficult. Advantages legislation Silo is Okura individual capacity, small footprint, easy access to warehouse mechanization, convenience of operation, small labor intensity. However, high cost, construction technical requirements, suitable for storage of grain and other granular materials.

Raw materials and finished feed mill variety, different characteristics, so for medium and large feed mill generally choose room type silos and combining large storage silo way better.

A large silo capacity is determined

Feed mills various silo capacity should be determined according to guarantee workers the normal continuous production requirements, storage capacity is too small, can not meet the needs of continuous production, resulting in production disruptions and even production rhythm disorder; storage capacity is too large, it will increase investment in infrastructure inventory is too large can cause the product and capital backlog.

Calculation (a) raw materials warehouse (library) of storage capacity and warehouse area

Mainly used for storage capacity of the main raw materials and sub-materials depends on the size of warehouse, transportation conditions, raw material suppliers near and far, and so the effectiveness of the various components of the plant. Calculate the average formula should be calculated separately for each component based on the storage of materials, taking into custody and sub-species differences in density of certain raw materials, and so on. Barn and silo on the number of terms, increased by at least 10% of the margin, in order to ensure that there is sufficient storage capacity as a production turnover purposes. In inaccessible places need to increase storage capacity.

1, vertical cylinder bank warehouse capacity is determined

Warehouse capacity can be calculated as follows:

V = QηT / νk (m3)

Where Q- feed mill production capacity, t / d

η- storage of raw materials accounted for the largest proportion in the formulation,%

ν- storage of raw materials, bulk density, t / m3

Effective storage capacity K- legislation Silo, generally 0.85 K

T- stored for several days, usually for food raw materials take 30 to 60 days; expected to take 30 days for the deputy, finished take 7 to 10 days.

2, calculated WAREHOUSE construction area

Former warehouse area of ​​computing-room, first based on production capacity, storage for several days, the proportion of the formula to determine the effective storage capacity of its different raw materials and finished products (t), and then calculate the area of ​​each individual raw materials, final summed to determine the total footprint. Covers an area of ​​computing the individual raw materials are as follows:

A = 1000QS / nmμ (m2)

Where: A- a raw area (m2)

Q- need storage capacity (t), for the storage of finished products is calculated according to seven days

S- a single package occupied area (m2)

Flour 0.26m2, sacks 0.42m2, 0.35m2 bags

n- heap of packages

m- material per package weight (Kg), for the finished feed is generally 40Kg

μ- warehouse room area utilization factor of 0.6 to 0.65

Calculate 3 ingredients warehouse and transitional positions

a warehouse to be crushed: pulverizing mill warehouse for small plants is generally 1 ~ 2h mill's production capacity, production for manufacturers to mill 3 ~ 4h of. Each mill is best to configure two smash positions.

b ingredients warehouse: medium and large feed mill can be 5 ~ 6h production capacity, and for a small plant press 4h production capacity calculations. The number of positions depending on the ingredients of ingredients depending on variety, and increase 1 to 2 motor compartment. Small plants are usually 8 to 10 ingredients warehouse; hours yield 5 to 10 tons of the plant, usually 10 to 12 positions; large-scale plant is generally 12 to 16 positions; individual large plants have 20 to 24 batching plants .

4. be granulation warehouse: warehouse to be generally based granulator granulation capacity 1 ~ 2h calculations. In order to replace the formula does not interrupt production, generally every two granulators are set to be granulation positions.

5. finished packing warehouse: warehouse capacity of finished bales should be balers one hour production capacity calculations.

6 bulk finished products warehouse: bulk finished products warehouse capacity is generally 1 to 3 days of measurement by calculations.

Two. Stand Silo

Li Silo body having granular material receiving, storage, unloading, inverted position and indicates the material level and other functions, it plays a balanced production process to ensure continuous production, saving manpower, improve mechanization and automation, as well as pest and prevent material metamorphic effects.

Li Silo common steel and reinforced concrete production, mostly cylindrical. Because of reinforced concrete warehouse relatively high cost, since the major construction period long enough, but there are long-life characteristics, so it is mainly used for large reserve base, while working as a manufacturer's warehouse, the use of more a silo. There are links silo using bolt corrugated steel silo and the coil-rolled coil positions.

1, corrugated steel silo: corrugated steel silo, also known as assembly positions, is thin-walled steel silo rapid development in recent years, its wall thickness of 1.2 ~ 4mm. Warehouse wall thickness decrease with height and thicken. Although the thin wall, the outside temperature is easy to pass, but the food is a poor conductor of heat, it is only 30cm away from the wall within the grain temperature change. General 15:00 highest temperature, 7:00 returned to normal. Such as long-term storage, to regularly pour warehouse and ventilation.

Corrugated steel silo is made of corrugated steel with a certain curvature assembled together by bolts. Wave height is generally 12mm, 65mm thickness wave width 1.2 ~ 4.0mm. Silo diameter and height of the existing series; conical bottom compartment diameters from 4.27m to 9.77m, the height from 4.8m to 24.4m. Flat warehouse diameters from 4.27m to 18.3m, height from 4.95m to 25.6m.

2 coil spiral steel silo warehouse is dedicated spiral warehouse processing unit will be rolled strip steel made​​. When the roll is to 495mm wide coil of zinc into the molding machine, the molding machine into the desired geometry of the roll, as the diameter of the silo. Then after bending machine bending, seams, around the outside of the silo, the formation of a 30 ~ 40mm wide, surrounded by a continuous spiral ridges. The ridges on the strength of the structure plays a role in strengthening the silo. Coil positions but also on two different materials to achieve a double bend, seams. Coil warehouse is a good sealing performance compared with the assembled bin greatest features. Coil can be made fluid storage warehouse warehouse.

The material in the form of 3 silo: silo discharge cone has a flat bottom discharge and discharge forms. Mainly determined by the material in the form of the diameter of the silo, generally greater than 10m in diameter silos are flat positions.

(A) flat out silo infrastructure costs are relatively small, but you need to configure the warehouse machinery, another flat warehouse unloading is not complete, the residual more need to manually clean up.

(2) conical bottom positions on the basis of the construction cost, long construction period, but without sweeping machine warehouse, unloading relatively clean.

4 Li Silo unloading process

Silo storage of raw materials into the stand before, generally beginning to clear miscellaneous, dry and ventilated, such as the occurrence of pests and diseases during storage, the need for fumigation destroy pests; If you find material overheating, excessive moisture, the need to pour warehouse ventilation.

(A) dry and ventilated storage and some raw materials in the pre-stored water content than the standard requirements need to be dried to reduce the moisture content to prevent the material mildew. There are dry dry dry dry and airy two kinds. Drying Drying need heating, high processing costs, mainly for the high water content of the newly acquired raw grain. Dry and ventilated warehouse turnover mainly used in ventilation and cooling on dry, apply a slightly higher moisture and high temperatures season.

Drying dry by drying tower and stove components. Dryer air flow range at 0.66 ~ 1.33m3 / m2 s. The main factors affecting dry materials are: air temperature and humidity, drying machine temperature, air flow, moisture content of materials, the flow of material from the dryer as well as by the type of material and so on. Feedstuffs drying temperature control in 82 ℃ ~ 83 ℃, the maximum temperature tolerance of different materials are different varieties of wheat resistant to high temperature, followed by oats, corn. Granularity and drying materials related difficulty. Drying temperature is higher, the volatility of corn starch, is not easy at the time of forming the feed pelleting. The time required for drying corn drying wheat higher than 60%.

Drying drying process including materials for high-temperature drying fast and slow cooling process. This process can improve both the quality of materials (reducing stress cracking particles through the tempering process), but also make the dryer capacity increase of about 70%. And energy consumption per ton of dry material is reduced by 20%. The dried material is discharged dryer temperature is 49 ℃ ~ 60 ℃, is fed into the hopper and slow Su Su slow over 4h in the warehouse, so that moisture transfer from the inside to the outside of the particle, and then a small amount of wind ventilation to cool the material until material cooled. After the above tempering and cooling process, the water can be removed about 2 percentage points.

Fumigation large silo group (2) the material should be based system silo grain pest extermination fumigation system. The system uses a blower will contain a certain concentration of toxic fumigant gas (such as methyl bromide gas) forced circulation, sealed fumigation. The system has a fan, heater, gasification tank, gas outlet, dust filters, slide valves, chutes and other components.

(3) warehouse roof, bottom loading, unloading and transportation of materials warehouse

a. warehouse roof top transport conveyor loading hopper loading commonly used scraper conveyor, scraper conveyor because the chassis is closed, the discharge can be avoided when the dust outside the Yang. When configuring the warehouse roof transportation equipment, two rows adjacent silos can share a conveyor, conveyor discharge port allows arranged inside the silo center.

. b bottom end warehouse unloading warehouse unloading many forms: ① outflow of material from the hopper cone-shaped, it can be removed forcibly unloading equipment and saving power, but requires fighting cone angle of inclination must be greater than 45 ° to avoid material knot arch blocked. ② fluidized discharge cooling type using fluidization achieve the purpose of the material, it can reduce engineering investment, but when the material does not need to play the role of ventilation and cooling to the tide. ③ flat sweep warehouse-type rotary rake unloading machine warehouse unloading the material, it can reduce construction investment, increase the effective capacity of the silo.

materials c. warehouse at the end of transportation equipment warehouse at the end unloader removed mostly by scraper conveyor conveying away. In the configuration, should adopt the following line of the silo with a conveyor. If two lines share a conveyor when the silo unloader, you need to increase the height of the silo-based, increasing construction costs, the cost is more than the cost of a higher increase of the conveyor, it is not economical.