Forage Grass Drying Machine in Paraguay

Why a Paraguayan Forage Processor Needed Mechanical Drying

Paraguay has a substantial cattle industry, with extensive pasture-based beef production and a continuing need to manage forage availability across different seasons. Pasture conditions can change with rainfall, temperature and local growing conditions. When grass is harvested for preservation, the processor must consider not only how much forage is available but also whether it can be dried to a suitable condition before being stored.

The customer operated between pasture production and livestock feeding. Its raw material came from managed grassland and forage fields supplying cattle operations. The main material was chopped pasture grass, collected when growth was sufficient for harvesting. The business wanted to preserve part of this material instead of relying entirely on fresh forage or conventional field drying.

Natural drying remains a useful method when weather conditions are favorable. However, freshly cut grass contains substantial moisture, and the material cannot be treated in the same way as dry hay already suitable for storage. If rain interrupts field drying, the preservation schedule can be delayed. If partially dried forage is stored too early, moisture-related deterioration may become a concern.

The customer therefore added a rotary forage dryer to give its operation another way to manage harvested grass. This was a targeted investment in the drying stage, not a replacement for pasture management, harvesting machinery or the equipment used to prepare cattle rations.

The Selected Configuration: φ1.2 × 12m Rotary Dryer

The project used a single-cylinder rotary drum dryer with a diameter of 1.2 m and a length of 12 m. This model was selected as the planned configuration for a forage processor adding drying capacity to an existing operation.

The choice was based on the intended role of the machine and the need to coordinate it with the customer's available grass supply, chopping equipment and downstream storage arrangements. The final hourly throughput would need to be established from the actual inlet moisture, target outlet moisture, heat source and operating schedule.

The temperature figures are the supplied equipment reference parameters, not fixed operating settings for every forage. Actual drying conditions must be determined from the material characteristics, heat source, feed rate and required final condition. The supplied specification also does not state a rated throughput for this model, so no unsupported capacity figure is assigned to the project.

What Kind of Grass Was Processed?

The planned feedstock was chopped pasture grass collected from managed forage areas. Depending on the source and season, the material could include locally grown tropical or subtropical pasture grasses suitable for cattle feeding. The exact species would be confirmed from the customer's actual fields rather than assuming that every grass variety behaves identically during drying.

The material was intended to enter the dryer after chopping. This is important because long, tangled grass can be difficult to distribute consistently through a drying system. Chopping helps prepare the forage for feeding and movement through the drum, although the required particle length must be determined according to the machine's feeding arrangement and the downstream use.

Incoming moisture would vary with harvest timing, grass maturity and recent rainfall. Young, freshly cut grass can carry a high moisture load, while material that has already wilted in the field requires less water removal. The customer therefore needed to distinguish freshly harvested grass from partially wilted forage when planning the drying operation.

The project did not assume a fixed blend of grass and grain inside the dryer. The purpose of this machine was to remove moisture from the forage itself. Any later addition of grains, protein ingredients or minerals would take place in a separate feed preparation stage according to the cattle ration requirements.

How the Rotary Drum Dryer Fits into the Existing Process

The drying machine was positioned after grass collection and chopping. Prepared material would be transferred to the feed end of the rotary drum, where it enters the rotating cylinder and progresses through the drying section.

As the drum rotates, internal material-lifting and conveying elements repeatedly redistribute the grass. The material comes into contact with the hot drying medium as it advances toward the discharge end. Moisture evaporates and leaves with the exhaust stream, while the partially dried or dried grass moves out of the machine for cooling and subsequent handling.

Forage is fibrous and may behave differently from granular materials such as grain or mineral products. Its feeding consistency, moisture content and particle length influence how it moves through the drum. A stable supply of chopped material is therefore important to the overall process.

The rotary dryer does not replace the chopping stage. Nor does it automatically produce finished hay pellets. Its role in this project is moisture reduction. If the customer later decides to make forage meal or grass pellets, additional size reduction, mixing or pelletizing equipment may be needed after drying, depending on the required product.

Why the Customer Bought Only One Dryer

The customer's existing operation already covered the main forage preparation activities. It could harvest grass, reduce its size and move the prepared material between working areas. The missing function was a controlled drying stage for selected batches.

Purchasing a complete forage pellet production line would have introduced equipment that the business did not immediately require. A single rotary drum dryer offered a more direct way to address the moisture problem while preserving the customer's existing investment.

This also gave the business flexibility in how it handled different harvests. Grass that could be preserved successfully through conventional field drying did not have to pass through the mechanical dryer. The rotary system could instead be used when the moisture condition or the operating schedule made additional drying necessary.

Such an arrangement is useful for a forage contractor because drying demand does not always remain constant throughout the year. Harvest volumes, grass moisture and customer demand may change. The machine's operating schedule can be planned around the actual material flow rather than requiring the whole business to operate as a continuous high-volume plant.

What the Dried Grass Was Intended For

The principal application was preserved roughage for beef cattle feeding. Once dried and cooled to an appropriate condition, the grass could be moved into suitable storage and used as part of the customer's forage supply program.

For cattle producers, conserved forage provides a way to manage feed availability when pasture growth declines or when freshly cut grass is not available in sufficient quantities. Its nutritional value depends on the grass species, maturity at harvest, leaf-to-stem ratio and the handling conditions before and after drying.

Drying cannot restore nutrients that were already lost through poor harvesting or prolonged deterioration. For that reason, the customer needed to consider harvest timing and the quality of the incoming material alongside the dryer settings.

The output was not automatically classified as a complete cattle feed. It remained a forage ingredient. If the customer wanted to incorporate it into a mixed ration, the amount used would depend on the livestock category and the other ingredients in the feeding program.

Other Uses of a Rotary Forage Dryer

Although this project focused on pasture grass for cattle, rotary drum dryers are used in a range of agricultural and industrial drying applications. Their suitability depends on the material's moisture, fibre characteristics, bulk density, abrasiveness and required final condition.

• Other chopped forage grasses can be evaluated for drying when they are suitable for livestock feed and compatible with the machine's feeding arrangement.
• Alfalfa and other forage legumes may be processed in appropriately configured drying systems when the goal is to preserve them for later feed preparation.
• Selected agricultural residues can be dried before further processing, provided their physical properties and intended use are compatible with the equipment.
• Suitable biomass materials may be dried before grinding or pelletizing, although their drying requirements can differ substantially from those of animal feed forage.

These are potential applications of rotary drying technology rather than a claim that one machine can process every material without adjustment. A change from pasture grass to a different raw material may require a new assessment of feeding behavior, moisture-removal demand, heat supply and product quality requirements.

Managing Heat and Moisture for Forage Quality

For this project, the goal was not to use the highest possible temperature. It was to remove the required amount of water while maintaining the suitability of the grass for its intended use.

The equipment reference lists an inlet air temperature of 400–500°C and an outlet air temperature of 70–80°C. These values describe the specified hot-air operating reference; they should not be interpreted as the temperature of the grass itself throughout the drying process.

As moisture evaporates, the wet material absorbs heat. The actual product temperature depends on the inlet condition, airflow, residence time and process settings. Forage quality also depends on how the grass was harvested and handled before entering the machine.

RICHI's technical planning therefore needed to consider the material's starting moisture, the desired final moisture and the available heat source. The final operating settings would be established during commissioning rather than prescribed as one universal recipe for all grasses.

Cooling and Storage Were Part of the Planning

Drying does not end when material leaves the drum. The output needs to be handled in a way that prevents it from picking up moisture again before storage.

The customer therefore needed to consider the space available for cooling and the route from the dryer discharge to the storage area. Depending on the layout, a discharge conveyor or other transfer equipment could be used to reduce manual handling and keep the material flow organized.

Storage conditions also matter. Dried forage should be protected from rain and moisture ingress, with sufficient ventilation and handling practices appropriate to the product. Material that has not reached a suitable storage condition should not be treated as stable simply because it has passed through a dryer.

This was one reason RICHI reviewed the downstream arrangement before finalizing the equipment selection. The dryer had to fit into a practical material flow, not operate as an isolated machine without a clear discharge destination.

RICHI's Preparation Before Equipment Shipment

Before the equipment was dispatched, the customer needed to provide information about the type of grass, the approximate inlet moisture range, the expected material flow and the intended storage condition. These details helped establish the scope of the drying application and identify the interfaces that had to be prepared at the site.

RICHI could provide the equipment drawings, overall dimensions, installation guidance and operating documentation needed for site preparation. The customer would also need to confirm the available heat source, electrical arrangements, feed-end access and discharge clearance.

Commissioning would focus on observing how the actual grass moved through the drum and whether the selected operating conditions achieved the required moisture reduction. Operators would need instruction on routine inspection, lubrication, safe start-up and shutdown, and monitoring for abnormal vibration or changes in operating behavior.

These preparations are especially useful when a customer is adding one machine to an existing facility. The objective is to make the new drying stage work with equipment already on site rather than forcing unnecessary changes to the entire forage handling arrangement.

Shipping to Paraguay Through the Port of Montevideo

The φ1.2 × 12 m rotary dryer was planned for sea shipment from Qingdao Port in China to the Port of Montevideo, Uruguay. Paraguay is landlocked and relies on regional transport and river-port connections for international trade. Montevideo is a regional maritime gateway that can be considered for shipments destined for Paraguay, subject to the carrier's routing and cargo arrangements.

Before shipment, the customer needed to confirm the unloading plan, installation area, foundation requirements, heat-source connection and the interfaces between the dryer and existing equipment. The layout also had to allow safe access for inspection and maintenance.

RICHI could provide the equipment documentation and installation information required for site preparation. Technical support would focus on the rotary dryer, its operating conditions and the material flow through the drying stage, with commissioning procedures based on the customer's actual grass.

A Focused Drying Upgrade for Paraguay's Cattle Feed Sector

The forage grass drying machine in Paraguay was selected to address a specific requirement in the customer's forage handling operation. The business already collected and chopped pasture grass for cattle feeding, but wanted an additional preservation option when natural drying was not convenient for the planned material flow.

The φ1.2 × 12 m rotary drum dryer provided a defined drying stage without requiring a complete new forage processing line. The machine's reference drum speed and hot-air temperature ranges offered a starting point for process planning, while the actual throughput and final moisture would be determined from the incoming grass and the required storage condition.

For businesses comparing a forage grass dryer, grass rotary dryer or agricultural biomass drying machine, the most useful information to prepare includes the grass species, harvest condition, particle length, moisture range, required final moisture and intended downstream use. These details help RICHI Machinery assess whether this configuration is suitable or whether another drum size or drying arrangement should be considered.

The purpose of the project was straightforward: add controlled moisture reduction where the existing operation needed it, preserve the equipment already in use and create a more flexible way to prepare grass for cattle feed storage. A properly matched rotary dryer can serve that role without turning a focused equipment purchase into an unnecessarily large project.