RFP 045 - Technical specification form
The Offerors may offer the equipment from its production program which can vary in certain items of the specification, but without changing the
concept of drying technology and drying capacities that are required in the Scope of Work.
Requested technical specifications
Daily capacity based on raw plum is 3.000kg /24h.
Possibility for drying fruits, vegetables and medicinal and
aromatic plants.
3 Prefabricated, mounting dryer with steel structure.
4 Walls made of insulated polyurethane panels (50mm thick) coated
on both sides with galvanized non-ferrous metal sheet.
5 All metal parts of the dryer construction should be protected by
hot dip galvanizing.
6 Tunnel type dryer with trolleys and metal racks for carrying raw
materials. Metal racks are placed on trolleys which pass through
the tunnel on rails/guides installed on the floor. The trolleys are
operated by the electric motor with reduction gear.
7 At the front of the tunnel is the trolley inlet door (entrance for
trolleys carrying metal racks with raw materials), and at the back
or side of the tunnel is the trolley outlet door (exit for the trolleys
with dry material). The trolleys are loaded at the trolley inlet door
and off-loaded at the trolley outlet door.
8 It has sufficient number of work trolleys and metal racks for
drying of raw material in the tunnel and additional trolleys and
metal racks out of the tunnel for the off-loading of dry material
and refilling of raw material to ensure continuous operation of the
dryer. The number and the load capacity of trolleys and racks
must ensure continuous drying of 3,000 kg of raw plums for a
period of 24 hours.
9 Metal racks are made of stainless steel and stainless steel wire
mesh intended for use in the manufacture of food products (per
ISO 9000 standard for the food industry). Dimensions of the wire
mesh are suitable for drying various kinds of fruits, vegetables,
herbs and mushrooms, and allow for easy removal of organic
residues from previous drying.
10 Drying of raw materials is carried out by hot air. The dryer has a
unit (thermal energy generator) for the production of thermal
energy for heating the hot air for drying. The unit has heat
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2
Offered technical specifications
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13
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15
exchangers for the transfer of produced heat and heating of the
fresh air. The unit uses solid fuel (wood, coal, biomass) with the
possibility of adjusting to a different type of fuel (gas and liquid
fuels). The unit is in a physically separate and heat-insulated area
in the dryer, made of boiler-grade steel and has all the necessary
equipment and infrastructure for supply and drainage of water.
The dryer is indirect; the unit for the production of thermal energy
is designed to not allow the mixing of flue gases and combustion
products with the air for drying.
The air temperature and the air flow in the tunnel are controlled by
a combination of fans, dampers/louvers and chimney.
It has automatic air-temperature control through via thermal
regulator, for adjusting of drying for various materials (fruits,
vegetables, mushrooms and herbs). The flow and transport of air
in the tunnel is achieved by a fan mounted in the ceiling part of
the drying chamber. The air flows in the opposite direction to the
direction of movement of the trolleys and is evenly dispersed in a
drying tunnel at the horizontal and vertical level. The recirculation
of air in the drying chamber (control of the intake of fresh air and
expulsion of saturated air) is allowed in the range of 0 to 100%,
which is controlled manually.
Built-in fan in the chimney of the dryer to extract the products of
combustion from the furnace of the unit, which allows for better
fuel combustion and heat transfer in exchangers.
The operation of the dryer is regulated by automatic measuring
and control instruments located in the electrical power command
box / control panel, to manage and control the work of the drying
chamber. The command box contains a regulator of the rotational
speed of the motor of the fan in the ceiling part of dryer, which
serves for the adjustment of air flow speed to the different
materials which are dried. The box also contains a command of
the electric motor that drives the trolleys in the tunnel as well as
measuring and control equipment for boiler operation.
RFP 045 Technical features form
Type
Dimensions of the room for installation of the dryer:
 length
 width
 height
Dimensions of the body of the dryer:
 length
 width
 height
Dimensions of the tunnel of the dryer:
 length
 width
 height
The chimney height
Insulated panels thickness
Number of trolleys
Number of metal racks
Number of metal racks per trolley
Size of metal racks
Effective surface area of drying per one metal rack
The quantity raw plums per metal rack
Operating temperature of the drier
Temperature of the combustion products at the exit of the chimney
Energy/ water heat
The required amount of water
Operating pressure of the dryer thermal energy generator / boiler
Installed thermal power of the thermal energy generator / boiler
Installed power of electric motors:
 main fan-motor for air flow in the tunnel
 fan-motor for insertion of fresh air for combustion
 fan-motor for flue gases in the chimney
 electric motor with reduction gear to move trolleys
Maximum airflow rate of the main fan-motor
Unit
mm
mm
mm
mm
mm
pieces
pieces
pieces
mm
m2
kg
°C
°C
°C
L
Bar
kW
kW
m3/h
Quantity