Mineral grain dryers PERRY, Dnepropetrovsk region.

Mineral grain dryers of continuous PERRY mixed flow is exported all over the world for drying various loose agricultural crops. PERRY produced their first dryer in 1954. All grain dryers are developed and manufactured in Great Britain. Standard dryers have a capacity ranging from 5 t/h to 500 t/h, but it is always possible to manufacture a dryer according to the client's requirements.

The main advantages of PERRY dryers:

- All parts of dryers are made from a combination of parts processed by the method of deep hot galvanizing, pre-galvanized steel and parts with bright galvanization;

- The design of the section, allowing to evenly dry any product;

- Low fuel consumption, economical fuel equipment;

- High-performance pneumatic unloading mechanism;

- Reinforced construction of all dryer parts;

- Thermal insulation of the hot air chamber;

- Emergency hatches are supplied as standard;

- Inverters for adjusting the performance of axial fans;

- The grain dryer control system based on a PLC with a touch screen is a completely proprietary development of the PERRY company;

- The possibility of remote control, management and diagnostics of the dryer using the Internet;

- Full technical support directly from the manufacturer;

- Dryers can be delivered both with a single and a double shaft, width from 2 m to 8 m;

- The manufacturing plant has its own drying complex for research and testing of new developments in the field of grain drying.

Working principle

The reserve section of the dryer is kept filled with grain by means of a feeding system. This ensures the constant filling of the mine with grain, which is necessary for efficient operation. On the culture selection page of the control panel, data about the culture is entered to obtain the optimal speed and correct drying temperature. You enter the type of grain, i.e. flour wheat orsunflower, the humidity of the crop at the entrance to the dryer and the desired humidity at the exit from the dryer. Then the dryer's PLC calculates the dryer's optimal performance and operating temperatures.

The heat source (drying agent) is usually a diesel or gas burner. But at the client's request,steam generators, biomass furnace units, etc. can also be used.

When drying light crops, such as rapeseed, it is necessary to reduce the amount of air passing through the grain dryer. For this, inverters are used, which allow to reduce the performance of the fans, to reduce the amount of air blown through the grain and to exclude the removal of grain through the fans.

After the grain dryer has been warmed up for a short period of time, unloading can be started. Выгрузка is a set of flaps that open and close at certain intervals with the help of pneumatic cylinders. All unloader settings are set in the control panel and can be adjusted manually by the dryer operator.

The first grain loaded into the grain dryer at the beginning of the drying process will not be dried, as it did not pass through the drying zone, but immediately entered the cooling zone. Therefore, this grain must be recirculated (returned) back to the dryer. At this time, the operator must periodically check the humidity of the grain at the entrance and exit of the dryer. When the desired moisture content at the outlet is reached, the transportation route is changed so that the dry grain is sent further along the technological line, for example to storage. Recirculation is turned off.

As soon as the operator is sure that the constant humidity of the grain is maintained at the exit of the dryer, the automatic mode can be selected, which allows the PLC to control the grain dryer without the need for the operator to be constantly present.

Construction of a grain mine.
The grain mine of PERRY grain dryers consists of sections (boxes) with incoming and outgoing air channels through which hot (drying zone) and cold (cooling zone) air passes. Grain moves vertically down the grain shaft, which, as it moves down, gives moisture to the air passing through the channels.

- The grain chute of the dryer is made of galvanized steel with a thickness of 2 mm and has a smooth design, without protrusions, to reduce the residual dust and straw, excluding the creation of traffic jams and sources of ignition. Corner vertical racks made of 5 mm thick steel.

- The conical shape of the boxes of the grain dryer ensures uniform drying of the product.

- The upper row of boxes of grain dryers are made of galvanized steel with a thickness of 3 mm.

- Level sensors are installed in the grain mine, which control loading of the dryer. Temperature sensors are also installed in the mine to control the temperature and humidity of the product. At the client's request, current humidity sensors can optionally be installed.

- Dampers for adjusting the ratio of the number of drying/cooling sections. Standard performance of dryers is given at 25-30% cooling.

Unloader
All PERRY grain dryers are supplied with high-performance wear-resistant pneumatic unloading mechanisms. Unloading bunkers are installed under the pneumatic unloaders.

- Fully galvanized construction of the entire unloading system.

- Double pistons on the unloading mechanisms of 2, 3 and 4 m. 4 pistons each on the unloading mechanisms of grain dryers of 5, 6 and 8 m.

- Pneumatic control panel, installed on the side of the unloading mechanism.

- The duration of the opening time and the frequency of the unloaders are fully adjustable from the control panel of the grain dryer.

- Reinforced unloading bunkers made of galvanized steel with a thickness of 3 mm.

- Viewing windows are installed in bunkers.

- Manual valves are installed in each hopper to introduce a certain amount of culture into the unloading conveyor.

- The compressor is included in the delivery set of the grain dryer.

Fuel equipment and burners
(//tractor-service.com)
PERRY dryers are supplied with direct and indirect heating through a heat exchanger, at the customer's choice.

Dryers can be equipped:

- Three-stage burners for diesel fuel (1.0 liters per 1% moisture content).

- Fully modulated burners for natural (1.2 m3 at 1% humidity) or liquefied gas (1.2 liters at 1% humidity).

- Two fuel burners - diesel/gas.

- Furnace blocks.

In order to obtain low temperatures of the drying agent, which are necessary for low air flow or when drying seed material, the PLC panel allows you to turn off the burners if the installation of smaller nozzles is not enough.

Variants of fans and silencers

Dryers are equipped with high-performance axial fans, with various installation options:

- Frontal;

- Lateral;

- Vertical.

All fans can be equipped with:

- Anti-dust flaps with pneumatic control.

- Protective weather shutters.

- Silencers in accordance with the requirements.

- CentriKleen dust collectors.

CentriKleen - an economical and simple solution to problems with the emission of dust and chaff from your grain dryer.
- Possible installation on existing axial fans of all models of grain dryers.
- Without increasing the power of the electric motor.

- Collection of up to 95% of visible dust and chaff.

- Does not require an additional steel support.

- No moving parts.

- Full galvanization.

- Dust and chaff can be collected in a trailer or dust hopper.

- Models for axial fans with a diameter of 1 m and 1.25 m are currently available.

- Harper Adams University produced an independent performance evaluation of CentriKleen. The full report is available upon request.

To adjust the performance of the fans, PERRY offers a number of solutions that allow even the lightest crops to be dried without loss (rapeseed, flax, etc.):

- In the standard equipment, grain dryers have inverters for adjusting the performance of fans, in order to reduce or increase the flow of air passing through the dryer.

- Ingrain dryers with several fans in the PLC panel, a built-in function will turn off the fans. To use this option, dampers must be installed on the fans.

Access and cleaning of the grain dryer. 

The entire design of PERRY dryers is aimed at maximum efficient drying, but no matter how ideal the design is, many factors are formed during the drying process, leading to the need to clean the equipment (dust, chaff, etc.).

For access and cleaning in PERRY dryers:

- Large doors of access to the discharge chamber.    They also allow you to clean the partitions above the unloader.

- Inside the grain dryer there are many corrugated crossbars that can be used as a ladder to access the dryer for cleaning and inspection.

- Sight glasses in the discharge chamber allow you to control the accumulation of dust and chaff.

Grain dryers with a double shaft

Grain dryers with a double shaft combine the performance of a large dryer with the flexibility to also use half of the grain dryer for drying small portions of grain.

When the grain dryer must have a higher productivity, it can be supplied in the form of a dryer with a double shaft. In this case, instead of one grain dryer with a capacity of, for example, 60 t/h, it has 2 mines with a capacity of 30 t/h each.

This means that if there is only a small amount of crop to be dried, only one shaft can be used, so that only half the amount of crop needed to fill the entire grain dryer is needed to start drying.

Also, the first mine can be left filled with one crop, while the second mine is used for drying the second crop to reduce the loss of time spent on emptying and refilling grain dryers. info.