Batch circulation: wet grain dried to safe moisture in one run

 The 5HH series batch-circulation grain dryer is a compact drying unit developed specifically on the basis of continuous-flow dryer technology. It targets the weakest point of small dryers: a small bin means the grain stays inside for only a short time, so a single pass can never bring wet grain down to safe moisture. The 5HH keeps the grain inside and circulates it again and again — if one pass is not enough, it runs another — and only opens the discharge valve once the on-line moisture meter confirms the target is reached. Drying depth is gained through time, not by building a taller tower.

 Two batch sizes are offered, 15 t and 30 t, with installed power of only 16.3 kW and 21 kW and a footprint starting at 3.4 × 2.1 m — well suited to family farms, agricultural cooperatives, village grain depots, small rice mills and seed growers. Several heat sources are available: natural gas, air-source heat pump, biomass such as straw or firewood, and coal-fired furnaces, so the cheapest local fuel decides the configuration.

Working Principle: Grain Circulates, Moisture Keeps Falling

Step1 — Loading.Wet grain is lifted into the tempering section at the top of the dryer; once a full batch  is in, the circuit is closed.

Step2 — Drying. Clean hot air from the furnace passes through the multi-layer angle boxes of the drying section and exchanges heat thoroughly with the downward grain bed, carrying moisture away. Reaching the bottom, the grain is not discharged but lifted back to the top by the recirculating conveyor for the next round.

Step3 — On-line measurement. A grain moisture meter at the discharge outlet reads the current moisture in real time and feeds the value to the control system.

Step4 — Discharge at target. The system compares measured moisture with the set point: below target, circulation continues; at safe moisture, the discharge valve opens automatically and the whole batch leaves the machine. The batch is repeatedly dried and tempered inside, so the moisture gradient is fully evened out and the discharged grain is uniform.

Main Features

1,Circulation instead of height: grain repeatedly circulates inside, so drying time is set by the number of passes rather than by tower height. The result is a short, low-steel, low-cost machine with a small footprint that still brings high-moisture grain down to safe moisture in one run.

2,Multi-layer angle-box air distribution: staggered angle boxes in the drying section give a large contact area and even air distribution, with no blockage or material build-up — good drying quality and uniform moisture.

3,Six-vane discharge: uniform discharge across the whole cross-section avoids stagnant grain and "first-in-last-out" batch mixing, emptying the machine more completely with less residue.

4,Multiple emergency outlets: several emergency discharge ports allow quick emptying in case of blockage, fault or crop changeover, cutting downtime.

5,Flexible heat source: natural gas, air-source heat pump, biomass such as straw and firewood — high combustion efficiency and significantly lower fuel cost.

6,Optional dust collector: drying exhaust is dedusted before release to meet environmental requirements.

7,One-key smart control with manual override: on-line grain moisture meter plus touch screen for intuitive display and simple operation, with one-key automatic control, a manual mode and automatic hot-air temperature regulation.

What It Really Delivers

1,Wet grain is no problem: freshly harvested paddy at 25% or higher can go straight in without partial sun-drying; one loading and repeated circulation brings it down to the safe storage range of 13.5–14.5%, cutting labour for turning and losses from double handling.

2,Low entry cost: only 16.3–21 kW installed, a short tower and a small footprint mean modest civil works and electrical provisions; family farms and cooperatives can afford their own drying capacity without waiting for major capital.

3,Stable quality, less breakage: low-temperature air (45–75°C, adjustable) combined with repeated tempering avoids thermal shock, keeping crack rate and breakage low and head-rice yield high — better appearance and better grade.

4,Easy crop switching: paddy, wheat, maize and soybean are all handled; empty the machine and adjust the process parameters to change crops — ideal for buyers handling mixed varieties in small lots.

Packing, Installation and Service

 Packing and shipping: the machine is split into sections and components, packed in wooden cases and on pallets, and can ship in a 20-ft or 40-ft container; packing list, foundation drawing and erection drawing are supplied.

 Installation and commissioning: the site needs only a concrete foundation, power supply and heat-source connection; erection typically takes 7–12 days, guided by our engineer on site or entirely by video, followed by a loaded trial drying to confirm performance.

 Training and spares: English manual and operating videos are provided; 1–2 operators are trained. One season of wear parts ships with the machine, and common spares are supplied long-term at ex-works prices.

 Warranty: 12 months for the main body and core components, with remote diagnosis during the warranty period.