Air heaters type NPA
NPA air heaters are designed to produce hot process air and are mainly used in grain or herb dryers. They are also used to heat large storage facilities, plastic tunnels, greenhouses, etc.
The machines are adapted to work with grain dryers, like, for example, Araj, Riela, Drzewicz, etc. They may be used wherever it is possible to use renewable fuels, often inutilely lost.
A BRIEF DESCRIPTION OF THE MACHINE
NPA air heaters use a counter current biomass combustion system with adjustable and properly arranged air blow enabling the achievement of better performance of the combustion process. This process is as follows: the air blowing fan to the combustion chamber, controlled by a microprocessor controller, sucks in air and feeds it to the combustion chamber to the places of the combustion of the charge. The heat produced as a result of the combustion is released into the air supplied by the air blowing fan. Then, the hot air can pass to the receiver through the duct system. The air is heated in exchangers directly from the heat generated during the combustion of straw (without a medium, like, for example, oil or water). This design enables the achievement of the increased efficiency of the machines and higher air temperatures.
In order to obtain an optimum exhaust composition it is advisable to use seasoned straw with a moisture content of up to 15%. NPA air heaters are not subject to Technical Inspection and registration at the Inspectorate of Technical Inspection.
The basic fuel for firing NPA air heaters is pressed straw of four types of grain and rape with a moisture content of up to 15% in the form of bales with dimensions of fi1500x1200 mm. The combustion of straw with a higher moisture content will reduce thermal efficiency and accelerate the wear of the heater and the chimney installation. The combustion of straw seasoned less than a year may accelerate the corrosive wear of the heater. Moreover, the combustion of straw with a moisture content of above 30% is energetically unacceptable and economically unjustified. Where necessary, an alternative fuel may be wood waste and branches.
- -efficiency of about 75%
- cheap fuel (straw, hay, etc.) 4 kg straw= 1 litre of heating oil
- easy operation
- compact design
- environmentally-friendly combustion of straw
Each heater has CE marking, the construction meets the requirements of European Union Directives.
It is possible to produce heaters with parameters other than those listed above.
|Details||Unit||NPA 250||NPA 350||NPA 600||NPA 850||NPA 1100||NPA 1300||NPA 1600||NPA 2400|
|Boiler power rating*||kW||250||350||600||850||1100||1300||1600||2400|
|Heated air temperature||C||110||105|
|Heated air flow rate||m3/h||~7000||~10000||~18000||~22000||~36000||~40000||~54000||~72000|
|1 bale fi||1 bale fi||2 bales fi||2 bales fi||3 bales fi||3 bales fi||3 bales fi||4 bales fi|
|Weight of one charge||kg||~140-170||~240-250||~480-500||~480-500||~720-750||~720-750||~960-1000||~1200-1400|
|Weight of unit with ceramics (gross)||kg||~7000||~9000||~11000||~13000||~19000||~21000||~25000||~30000|
|Required exhaust draft||Pa||~55||~65||~75||~85||~95|
|Heater length **||mm A||3100||3550||4740||5260||6250||6250||6250||8200|
|with fan **||A||4500||4700||7000||7800||8800||8800||9200||11200|
|Heater width **||mm B||1700||2100||2100||2100||2100||2100||2400||2400|
|with control box **||B||2350||2450||2450||2450||2450||2450||2750||2750|
|Heater height **||mm H||2180||2575||2590||2700||2700||2800||3200||3300|