Heat Pump for Eco-friendly Zero-pollution Low-temp Continuous Grain Drying

    The WGH Series Heat Pump Continuous Grain Dryer Tower is a high-capacity continuous grain drying equipment developed by Zhengzhou Wangu Machinery Co., Ltd. for large grain depots, grain purchasing & distribution centers, grain processing enterprises and large-scale planting bases (WGH base tower equipped with air source heat pump heating system). Adopting a vertical tower structure and using air source heat pump as the heat source, grain is fed continuously from the top and flows downwards sequentially through multiple drying sections, tempering sections and cooling sections for uninterrupted continuous operation. It forms an assembly-line drying process with synchronous feeding, heat pump low-temperature drying and discharging. The equipment can stably process bulk grains such as paddy, wheat, corn, soybean and sorghum. It is suitable for both commercial grain and seed grain drying, serving as core equipment for large-scale green post-harvest grain processing.

    The WGH Series Heat Pump Continuous Grain Dryer Tower features clean heat source, low-temperature grain protection, continuous operation and uninterrupted feeding & discharging. It is ideal for large-scale grain production scenarios with strict environmental requirements and demand for low operating costs. The equipment has a sturdy structure and uniform air distribution. Heat pump generates clean hot air to ensure stable drying quality. Equipped with bucket elevators and conveying equipment, it realizes fully automatic continuous grain circulation from the top feed inlet to the bottom discharge outlet. It is an optimal choice for green upgrading of medium-sized grain depots and large grain distribution centers.

Drying Process

    The WGH Series Heat Pump Continuous Grain Dryer Tower adopts the combined process of heat pump heating and multi-stage drying-tempering-cooling. After being fed from the top, grain flows down by gravity and passes through multiple drying sections in sequence. Clean low-temperature hot air produced by the heat pump system penetrates the grain layer diagonally to remove moisture gently layer by layer. After each drying stage, grain enters the tempering section to stay still, allowing internal moisture of grains to migrate to the surface and achieve balance so as to eliminate moisture gradient. Finally, grain enters the cooling section and exchanges heat with ambient air to reduce grain temperature close to ambient temperature. The whole process runs continuously and stably without shutdown, maintaining relatively balanced energy consumption under high throughput. There is no open fire combustion and exhaust gas is clean, complying with environmental emission requirements.

    The hot air temperature can be intelligently set according to grain variety and inlet moisture. Multi-stage low-temperature stable drying avoids grain shell bursting and cracking caused by thermal shock. The online moisture monitoring system continuously detects discharge moisture, and automatically fine-tunes discharging speed and heat pump operating parameters to lock the target moisture. Dried grains can be directly bagged and stored without secondary sunning, meeting the requirements of commercial grain export and long-term storage.

Structural Composition

 •Top grain feeding and distributing device: realizes continuous quantitative feeding and automatic spreading to ensure uniform grain layer. Multi-stage drying   •sections: clean hot air from heat pump penetrates the grain layer diagonally for gentle dehumidification layer by layer.

 •Multi-stage tempering sections: independent tempering space to ensure sufficient migration and balancing of internal moisture in grains.

 •Cooling section: exchanges heat between ambient air and grains to cool grain temperature close to ambient temperature.

 • Continuous discharging mechanism: quantitative continuous discharging at the bottom with adjustable speed to stably control drying duration. Lifting, conveying and heat pump heating system: bucket elevator, scraper conveyor and air source heat pump unit, matched with intelligent heat exchange and air supply module to provide clean low-temperature hot air and guarantee continuous operation.

Main Features

    Continuous operation with high output: feeding, drying and discharging run simultaneously around the clock with large processing capacity. Multi-stage low-temperature drying for grain protection: heat pump supplies clean low-temperature hot air without open fire or flue gas pollution. Stable low-temperature drying without thermal shock keeps grains intact and preserves seed germination rate. Uniform and stable drying: uniform air distribution without dead zones. Combined with multi-stage tempering to eliminate moisture difference for consistent batch quality.

    Clean heat source with low carbon emission: air source heat pump absorbs heat from ambient air. No combustion emission, which meets environmental control requirements in various regions. Electric drive brings low comprehensive operating cost, and no complex dust removal or desulfurization facilities are required. Sturdy tower body with good weather resistance: thickened anti-corrosion tower with thermal insulation layer can resist wind and rain, suitable for long-term outdoor application.

    Easy operation and maintenance: reliable core components, quick switch for drying different grains including paddy, wheat and corn. Equipped with intelligent control system to monitor grain temperature, moisture and heat pump working conditions in real time with automatic adjustment.

Packaging & Warranty

    The equipment is shipped in bare package with reinforced protection. Motors, electric controls, sensing elements and heat pump electric control modules are packed separately with moisture-proof, shock-proof and collision-proof treatment, suitable for long-distance highway transportation. Custom packaging solutions can be provided upon request. The product is manufactured in strict accordance with ISO quality management system. Each unit undergoes no-load commissioning, material-carrying drying test and parameter calibration before delivery. The main frame, drying tower body and transmission system are warranted for 12 months; the heat pump unit is covered under the original manufacturer’s standard warranty. We provide lifelong technical consultation, remote guidance, installation & commissioning, troubleshooting and long-term supply of original spare parts to ensure stable equipment operation. Minimum Order Quantity: 1 set; Lead Time: 45–60 days.