Constant-Temp Mixed Flow Gentle Conditioning Energy-Saving Seed Protection

    The WGP series circulating grain dryer is a new-generation batch-circulation, freshness-locking constant-temperature mixed-flow drying equipment launched by Zhengzhou Wangu Machinery Co., Ltd. in 2026. The operating workflow consists of quantitative grain loading, closed-loop circulation, mixed-flow penetration drying, tempered moisture equalization, and one-time discharge upon reaching target moisture. A batch of grain is loaded once into the storage bin; the elevator forms a closed loop that repeatedly conveys the grain through the hot-air zone for gentle dehumidification, until the entire batch reaches uniform target moisture and is discharged in one go. Developed specifically for high-quality preservation drying of high-moisture paddy, it also handles rice, wheat, corn, soybeans, sorghum, rapeseed, and various crop seeds — suitable for both commercial grain and seed grain drying.

    The WGP series features a "freshness-locking constant-temperature mixed-flow" process with a 30-ton per-batch loading capacity. Through heat-retaining humidity control, staged moisture exhaust, and internal-external synchronized dewatering, it achieves gentle drying that fundamentally addresses the high cracking rate and thermal damage caused by traditional high-temperature drying. It is especially suited for harvest-period emergency drying of high-moisture paddy where head rice yield and seed germination rate are critical requirements, serving scaled family farms, grain cooperatives, and grassroots collection points — the flagship model for mid-to-large batch drying scenarios.

Drying Process

    The WGP series adopts a freshness-locking constant-temperature mixed-flow high-efficiency drying process — low-temperature, high-airflow hot-air penetration + staged moisture exhaust + circulating tempering + waste-heat recovery.

    After the grain is quantitatively loaded into the storage bin, the bottom discharge mechanism feeds the grain uniformly to the bucket elevator, which lifts it back to the top where it falls into the drying section, forming a continuous self-circulation. High-volume blowers deliver constant-temperature hot air horizontally through the grain bed; through "heat-retaining humidity control, staged moisture exhaust, and internal-external synchronized dewatering," the process improves grain toughness and removes moisture gently — avoiding the cracked kernels and thermal damage caused by traditional high-temperature, dry-air drying.

    The equipment automatically sets the hot-air temperature based on grain variety and initial moisture, running at a stable low temperature with precise humidity control to protect seed vitality. After each hot-air pass, the grain enters a tempering stage where surface and internal moisture migrate and equilibrate, eliminating moisture gradients and reducing breakage from the source. Meanwhile, a large portion of the exhaust waste heat is recovered, reducing overall heat consumption by approximately 20%. An online moisture monitoring system continuously assesses the whole batch; once target moisture is reached, the unit automatically shuts down, triggers an alarm, stops circulation, and discharges the finished grain. The discharged grain leaves at a controlled temperature and can be directly bagged and stored without re-drying.

Structural Components

• Storage Bin: Top-mounted large-capacity bin with a rated batch capacity of 30 tons, serving both as a buffer and a circulating tempering chamber.
• Freshness-Locking Constant-Temperature Mixed-Flow Drying Section: High-volume hot air penetrates a thin grain bed vertically; combined with heat-retaining humidity control and staged exhaust structure, it achieves internal-external synchronized dewatering for uniform whole-batch drying.
• Closed-Loop Circulation System: Interlocked with the conveying device and elevator, it meters grain from the bottom and returns it uniformly to the top — smooth circulation, no spillage, low breakage.
• Screw Discharge Mechanism: Evenly arranged screw conveyors at the bottom provide quantitative, uniform grain discharge, ensuring consistent cycle count and thermal exposure per batch.
• Waste-Heat Recovery Heat Supply System: Compatible with biomass, coal, natural gas, electric heating, and other heat sources; built-in exhaust waste-heat recovery reduces heat consumption by about 20%, adapting to local energy conditions and environmental requirements.
• Intelligent Control System: Supports automatic loading, automatic circulation, online moisture monitoring, automatic shutdown, fault alarm, and overload protection, enabling unattended operation.

Core Advantages

Packaging & Warranty

    The unit is shipped in nude packaging with reinforced protection; motors, electrical control components, and sensors are individually packed with moisture-proof, shock-proof, and collision-proof treatment, suitable for long-distance road transport. Custom packaging solutions are available upon request. The product is manufactured under a strict ISO quality management system; every unit undergoes no-load testing, in-material drying trials, and parameter calibration before delivery. The main frame, drying tower, and transmission system carry a 12-month warranty. Lifetime technical consultation, remote guidance, installation & commissioning, troubleshooting, and long-term supply of original spare parts are provided to ensure stable equipment operation. Minimum order quantity: 1 unit; delivery lead time: 45–60 days.