The WGH counter-current & concurrent-flow grain dryer is a large-scale continuous grain drying equipment independently developed by Zhengzhou Wangu Machinery Co., Ltd. It is designed for national grain reserve depots, grain planting cooperatives, grain and oil processing plants, and grain trading & logistics enterprises. The equipment continuously dehydrates high-moisture raw grains such as corn, paddy, wheat, soybeans, sorghum and rapeseed, stably reducing grain moisture to the safe storage standard and effectively lowering losses caused by grain mildew and germination. Adopting an alternating concurrent-flow and counter-current vertical drying process, grains flow downwards by gravity. Combined with intelligent temperature control and variable-frequency grain discharge regulation systems, it supports uninterrupted large-capacity continuous drying and serves as the preferred drying equipment for large-scale grain processing and reserve projects.

    The dryer consists of multi-stage concurrent-flow drying zones, counter-current drying zones, multiple tempering sections and cooling zones. The concurrent-flow section uses high-temperature hot air to rapidly remove surface moisture, while the counter-current section achieves mild heat exchange. Together with tempering processes that balance the moisture gradient inside and outside grain kernels, the cracking rate of paddy and corn is greatly reduced. Hot air fully exchanges heat with grain layers without drying dead zones, delivering stable quality of dried grains. Compared with traditional dryers adopting single concurrent-flow or single counter-current technology, this unit features outstanding advantages in waste heat recovery & energy saving, grain quality preservation and long-time continuous stable operation.

Main Features

・Composite concurrent & counter-flow drying process: Alternating concurrent and counter-current drying paired with multi-stage tempering realizes gradient low-temperature drying, balancing drying efficiency and grain quality with excellent control of cracking rate and breakage rate.

・Wide processing capacity range: Complete standardized tower series to meet mass grain drying demands during harvest seasons.

・Heavy-duty industrial tower structure: Modular hot-dip galvanized steel tower with reinforced load-bearing frame, anti-corrosion and anti-aging, suitable for long-term outdoor open-air operation.

・24-hour fully automatic continuous operation: Continuous feeding of wet grains and stable discharging of finished dry grains, no intermittent shutdown required, ideal for rush grain drying during centralized harvest.

・Uniform drying with low quality loss: Alternating concurrent & counter-current heat exchange plus multi-stage tempering enables gentle and even heating of grains, maximizing the commercial value of grains.

・Complete product series: Standard specifications from 100 tons to 1,000 tons per day, covering small and medium cooperatives to large grain reserve depots; customized extra-large capacity available.

・Intelligent stable control system: Equipped with PLC intelligent control system for real-time online grain moisture monitoring, automatically linking and adjusting hot air temperature and variable-frequency grain discharge speed to guarantee stable production line operation.

・Wide adaptability to heat sources: Compatible with biomass pellets, coal, natural gas, steam and other hot air sources. Heat sources can be selected according to local energy conditions to cut operating costs.

・Waste heat recovery design: Recovers waste heat from drying exhaust gas to preheat inlet air, effectively reducing energy consumption per unit grain and achieving remarkable energy-saving effect.

Technical Parameters

Application Fields

   This concurrent & counter-flow dryer is widely applied in national grain reserve depots, grain & oil processing plants, large-scale planting cooperatives, port grain logistics centers and oil processing enterprises. It is suitable for drying corn, paddy, wheat, soybeans, sorghum, millet, rapeseed and other grain and oil crops. The equipment adopts indirect heat exchange with clean hot air, and flue gas does not come into contact with grains to ensure clean finished grains free of pollutants. Drying parameters can be flexibly adjusted to adapt to raw grains with different initial moisture and varieties. The finished grains feature uniform moisture and are not prone to heating and mildew during long-term storage after warehousing. The equipment can be arranged outdoors and can be equipped with dust removal and tail gas treatment systems to meet environmental emission requirements in various regions.

Packaging & Quality Assurance

   Each WGH concurrent & counter-flow dryer is shipped in bare package. Core components such as motors, sensors and electric control cabinets are separately packed for protection to meet highway, sea and land combined transportation requirements. Standard components are reinforced to prevent collision and damage during loading, unloading and transit. Customized packaging solutions are available upon request. All equipment is manufactured in accordance with the ISO Quality Management System and undergoes complete machine commissioning and testing before delivery. The main frame, tower body and key components enjoy a 12-month warranty. Supporting services include remote online technical support, on-site installation guidance, operation training and long-term spare parts supply. Minimum trial order: 1 set. Delivery cycle: 40–50 days. Payment terms: Telegraphic transfer advance payment or sight letter of credit.

   Please advise your required daily processing capacity, grain variety to be dried and heat source preference. We will recommend the most suitable concurrent & counter-flow model configuration and provide a favorable quotation.

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Application Cases of WGH Continuous Grain Dryer

Case 1: Sinograin Northeast Depot | WGH1000 Continuous Dryer (Corn Reserve Project)

Location: Northeast China Corn Producing Area

Model: WGH1000, 1000 tons/day for corn

Heat Source: Steam

Material: High-moisture corn, inlet moisture 28%～30%, dried to 14% safe storage moisture

Operation: 24h continuous operation under low winter temperature (-20℃). Complete turnkey project with steel silos, cleaning system, dust removal and conveying equipment.

Results

Stable capacity of 1000 tons/day during harvest season; post-drying moisture uniformity ≤2%, breakage increase＜0.5%.

Low-temperature mixed-flow process preserves corn color and test weight, fully meets inspection standards for national grain reserve.

Outdoor installation without workshop, saving infrastructure investment. Baghouse dust collector meets environmental emission requirements and passes EIA smoothly.

Case 2: Hubei Jingmen Rice Group | WGH300 Continuous Dryer (Paddy Drying Project)

Location: Jingmen, Hubei Province

Model: WGH300, 300 tons/day for paddy

Heat Source: Biomass pellet hot air furnace

Material: Late paddy rice, inlet moisture 24%～26%, dried to 13.5% safe storage moisture

Operation: Continuous operation in rainy southern seasons; low-temperature drying for heat-sensitive paddy to control cracking rate.

Results

Multi-stage tempering reduces paddy crack rate increment＜3%, improves head rice yield and increases milling revenue.

Biomass fuel reduces operating cost, utilizing local rice husk and biomass resources. Indirect heat exchange ensures zero flue gas contamination to grains.

PLC online moisture monitoring automatically adjusts grain discharge speed. 24-hour feeding & discharging during wet grain acquisition season, effectively preventing mildew of paddy in rainy weather.

Case 3: Xinjiang Yili Large Agricultural Company | Custom WGH1200 Continuous Dryer (Corn Drying Center)

Location: Yili, Xinjiang

Model: Custom WGH1200 ton/day (9 drying & 9 tempering sections)

Heat Source: Coal-fired hot air furnace

Material: Spring corn, inlet moisture 27%～29%, dried to 14%

Operation: Outdoor long-term operation under large day-night temperature difference and sandy wind environment in Northwest China.

Results

Hot-dip galvanized tower body is anti-sand and weather-resistant for stable year-round continuous operation.

Large single-pass moisture reduction. Integrated post-harvest service center with grain cleaning, drying and silo storage.

Supports grain drying service for surrounding farmers, and allows future capacity expansion up to 1500 tons/day.

Case 4: Henan Grain Cooperative | WGH150 Continuous Dryer (Multi-grain: Wheat, Soybean, Sorghum, Rapeseed)

Location: Nanyang, Henan Province

Model: WGH150, 150 tons/day

Heat Source: Natural gas hot air furnace

Material: Wheat, sorghum, soybean, rapeseed, multi-crop alternating drying

Operation: Emergency drying for wet wheat during summer harvest and rainy seasons, small & medium post-harvest service center.

Results

One machine for multiple crops; only simple parameter adjustment needed for variety switching, matching multi-grain purchasing business of cooperatives.

Small footprint, outdoor installation with lower investment threshold. Simple operation, operators can master after short training.

Timely drying for wet wheat during harvest, avoiding germination and mildew, reducing grain post-harvest loss. Eligible for agricultural machinery subsidy.

Case 5: Lianyungang Grain & Oil Trading Company | WGH500 Continuous Dryer (Export Paddy Project at Port Logistics Park)

Location: Lianyungang Port Grain Logistics Park, Jiangsu Province

Model: WGH500, 500 tons/day for paddy

Heat Source: Natural gas

Material: Commercial paddy for export, inlet moisture 25% dried to 13.0%

Operation: Port grain logistics, strict quality requirements for export commodity grain.

Results

Stable grain quality after drying, low breakage rate, meeting inspection standards for export grain with ISO certification.

Continuous production connects port loading & unloading, accelerates grain dehydration and shortens cargo turnover cycle.

Clean hot air indirect heat exchange, no pollutants in finished grains, satisfying hygiene requirements for export grain and oil.