Grain drying towers are key machines in modern agricultural production, capable of quickly and evenly reducing high-moisture grains to safe storage standards. Widely used for drying wheat, corn, sorghum, soybeans, and other grains, they are practical helpers in daily life.
A grain drying tower, as the name suggests, is a tower-type equipment that uses forced ventilation and heat exchange to dry high-moisture grains in batches, efficiently, and uniformly. It realizes the mechanization, automation, and standardization of grain drying, and its core mission is to quickly and safely reduce the moisture content of wet grains to safe storage standards, while maintaining or even improving their original quality to the greatest extent possible.
Elevator: Acts as a “porter,” continuously lifting wet grain to the top of the tower.
Feeding Hopper and Distributor: Ensures wet grain enters the drying layer evenly and smoothly, preventing bridging and uneven flow.
Drying Section: The core area of the tower, where hot air fully contacts the grain, removing moisture.
Refrigeration Section: The “soul” of the drying process, allowing the grain to achieve internal moisture balance in a windless or low-wind environment, preventing “bursting.”
Cooling Section: Cools the still-warm grain to near ambient temperature for immediate storage.
Grain Discharge Mechanism: Acts as a “metronome,” precisely controlling the flow rate and residence time of the grain within the tower.
Hot Air Furnace System: Provides a clean and stable heat source (coal, biomass, natural gas, oil, etc.).
Control System: The “brain” of the entire system, enabling one-button start/stop, precise temperature control, and full-process automation.
| Item Type | MN-102 | MN-135 | MN-150 | MN-300 | ||
| Weight(kg) | 2900 | 3000 | 3200 | 7500 | ||
| Capacity | Rapeseed | min-max volume(kg) | 7500-10300 | 7500-13450 | 7500-14850 | 12000-30000 |
| Max capacity(kg/h) | 473-1135 | 607-1456 | 675-1620 | 1000-3500 | ||
| Corn | min-max volume(kg) | 7500-10450 | 7500-13400 | 7500-16800 | 1200-30000 | |
| Max capacity(kg/h) | 756-1261 | 971-1681 | 1080-1800 | 1000-3400 | ||
| Wheat | min-max volume(kg) | 7500-10450 | 7500-13350 | 7500-16800 | 1200-30000 | |
| Max capacity(kg/h) | 315-756 | 405-971 | 450-1080 | 1000-3250 | ||
| Paddy | min-max volume(kg) | 6500-8400 | 6500-10850 | 6500-15000 | 9000-27800 | |
| Max capacity(kg/h) | 382-916 | 493-1184 | 548-1315 | 850-2800 | ||
| Dimension | Height(mm) | 7330 | 8450 | 9070 | 12180 | |
| Length(mm) | 4228 | |||||
| Width(mm) | 2750 | |||||
| Burner | Max capacity(L/h) | High temperature type:35.5 L/h
Low temperature type: 25 L/h |
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The wet grain is conveyed to the top of the tower by an elevator, and then, via a rotary distributor or conical distribution plate, ensures that the grain is evenly distributed across the entire cross-section of the drying section like a waterfall. During this process, the grain begins to come into contact with the warm, moist air flowing upwards, undergoing initial preheating.
1. Hot Air Injection: Clean hot air generated by the hot air furnace is forced into the air intake chambers of these angled tubes by a blower.
2. Lateral Penetration: Hot air is ejected from the air intake angled tubes, penetrating laterally (or obliquely) through the slowly flowing grain layer from top to bottom.
3. Mass-Heat Exchange: The hot air transfers its heat to the grain; the moisture on the grain surface absorbs the heat, rapidly vaporizes, and is carried away by the flowing air.
4. Mixed Flow Pattern: Due to the staggered arrangement of the angled tubes, grain at the same location is alternately penetrated by hot air from different directions during its descent. This “four-sided airflow” pattern creates an extremely uniform drying environment, eliminating drying dead zones.
After passing through one or more drying stages, the grain drying tower enters a tempering stage without forced ventilation. Here, the grain drying tower relies on its own residual heat and temperature gradient to redistribute its internal moisture. This is a crucial step for rice. Rapid drying causes uneven shrinkage between the surface and interior of the grain, resulting in cracks (cracking), severely impacting milling yield and commercial value. The tempering process allows sufficient time for moisture to slowly diffuse from the center to the surface, causing the grain to shrink evenly throughout, greatly reducing the cracking rate.
After drying and tempering, the grain enters the cooling section. Cool ambient air is drawn in from the bottom by a fan and penetrates the grain layer from bottom to top.
Countercurrent heat exchange: The coldest air first contacts the already cooled grain, while the warmer air rising to the top contacts the hottest grain, resulting in high heat exchange efficiency and uniform cooling.
Shaping and preservation: Rapid cooling stops further denaturation of starch, fixing the drying effect, and further hardening the grains for easier subsequent processing.
Safe storage: Reducing the grain temperature to only 3-5℃ below ambient temperature completely eliminates condensation caused by temperature differences between the inside and outside of the grain pile, a prerequisite for safe long-term storage.
The discharge mechanism at the bottom of the tower (such as a six-impeller or staggered discharge plates) discharges the dried and cooled grain at a precisely controllable speed.
The entire process, including hot air temperature, grain flow rate, discharge speed, and moisture control, is managed by a central control system. Users simply set the target moisture content (e.g., 14%) on the touchscreen, and the system automatically matches the optimal air temperature and flow rate, monitors the outlet grain moisture content in real time, and automatically adjusts accordingly to ensure uniform and stable moisture levels, achieving “foolproof” operation.
Grain Storage Enterprises: Large-scale grain storage enterprises need to process large quantities of grain. The grain drying towers enable rapid drying, improving storage safety and turnover efficiency. For example, national grain reserves use drying towers to quickly dry purchased wet grain to a safe moisture content, ensuring no mold growth during long-term storage.
Agricultural Cooperatives and Family Farms: With the development of large-scale agricultural operations, the grain output of agricultural cooperatives and family farms is constantly increasing. Grain drying towers have become key equipment for their post-harvest processing. They help farmers dry grain in a timely manner, preventing mold growth due to weather conditions, while improving grain quality and price.
Grain Processing Enterprises: Flour mills, feed mills, and other grain processing enterprises have strict requirements for the moisture content of raw grains. Grain drying towers provide them with raw materials with uniform and stable moisture content, ensuring the quality of processed products. For example, flour mills using dried wheat can improve flour yield and quality.
Grain Trading Enterprises: Grain trading enterprises need to dry grain during the purchase and sale process to meet the needs of different regions and customers. Grain drying towers can help trading companies quickly adjust the moisture content of grains and improve their market competitiveness.
Compared to traditional sun-drying, The grain drying tower’s advantages are significant:
First, it is highly efficient and labor-saving, with a daily processing capacity of tens to hundreds of tons, unaffected by weather, greatly reducing labor costs and site requirements, achieving the same high efficiency and cleanliness as a dry ice cleaning machine;
Second, the grain drying tower preserves quality and adds value, effectively preventing mold through precise temperature control and scientific processes, maximizing grain quality and germination rate, helping to fetch better prices, and its drying precision rivals the stringent quality requirements of a freeze drying machine;
Third, the grain drying tower reduces losses and increases revenue, minimizing post-harvest losses, equivalent to directly increasing output, with drying efficiency far exceeding the traditional mode of ordinary drying machines.
1. Scientific Drying Process: A Perfect Balance of Quality and Efficiency
Our unique multi-stage optimized “drying-tempering-cooling” process is far more than simple, direct drying and discharge. In particular, the patented tempering stage simulates the physiological characteristics of grains, allowing moisture to migrate naturally from the inside out, ensuring that the rice cracking rate is more than 50% lower than the industry standard, maximizing the protection of your grain processing value and economic benefits.
2. Superior Structural Design: The Foundation of Durability and Uniformity
The tower body is made of high-strength galvanized steel or weathering steel, corrosion-resistant and with a long service life. The core mixed-flow angled tube arrangement is optimized by Computer Fluid Dynamics, resulting in a more uniform airflow distribution and no dead spots in drying. The high-efficiency centrifugal fan and low-resistance design result in lower energy consumption and less noise at the same airflow rate.
3. Ultimate Energy Saving and Environmental Protection, Saving You Every Penny
We offer a variety of cost-effective heat source solutions, especially recommending the modular biomass hot air furnace, which features automated feeding, complete combustion, and extremely low operating costs. Combining polyurethane overall insulation and an intelligent waste heat recovery system, the overall energy consumption is reduced by 20%-30% compared to traditional equipment, making it affordable and efficient.
4. Highly intelligent control, easy management by one person.
A fully automatic PLC control system is standard. Touchscreen operation and fault location display allow you to simply set the target moisture level, and the equipment automatically matches the optimal parameters and completes all operations.
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