VESKO-S
Description
The VESKO-S boiler is independent with entirely welded box construction. The lower part of the boiler forms grate case, walls of combustion chamber are cooled by water. Grate is cooled by combustion air and it is controlled by hydraulic gear. Waste gases go trough first draft of conventional exchanger, then they continue into double draft separate water exchanger. Waste gases are sucked away from boiler through dust off system by flue exhauster and they are leaded into the chimney. Fuel (trusses) is supplied by fork lift truck into area under stacker. Then stacker gives trusses on the conveyor which is moving them into cutting device. Here are trusses hoisted into vertical chamber, separated by means of knife and pushed by piston via cooled tunnel on the boiler grate. The fuel way is blocked by gate (water cooled shutter) when piston moves back so that recombustion would not occur.
1.Fuel stacker, 2. Straw conveyor line, 3. Cutting device, 4. Gate, 5. Sloping reciprocal grate, 6. Combustion air intake, 7. Ignition arch, 8. Combustion chamber, 9. Separate exchanger, 10. Ash conveyor
Purpose:
VESKO-B boilers are designed for heating plants of a central heating supply and industrial plants. They are produced in following sizes
- Thermal output 2 to 5 MW
- Construction pressure 0,3 to 0,6 MPa
- Working temperature 90 – 110 °C
Types of fuel
Fuel:
Grain straw, rape straw, triticale, flax, hay, sorrel
Grain straw of the parameters:
- width 1,2 m, height 0,7; 0,9 m; 1,2 m, lenght2,2 až 2,5 m
- straw bales weight 200 až 350 kg
Grain straw of the parameters:
- calorific value min. Qir = 13,9÷15,1 MJ/kg
- moisture: max. Wr = 11÷17 %
- popelnatost max. Ar = 5,3 %
Transport routes of the fuel:
Fuel (straw bales) is supplied by forklift truck into area under the stacker (crane). Then stacker gives straw bales on the conveyor
which is moving them into cutting device. Here are straw bales hoisted into vertical chamber, separated by means of knife and
pushed by piston via cooled tunnel on the boiler grate. The fuel way is blocked by gate (water cooled shutter) when piston moves
back so that recombustion would no occur.
Advantages of the concept
Fuel feeding:
- Stocking trusses by forklift truck into the columns under the crank stacker minimize necessary area for storage and handling with straw
- Dividing of straw truss in the cutting device has a minimal energy demands and there is not necessary any other adjustment of the truss before entering the boiler (for example removing a rope), load of the knife is minimal there is no need to change it often
Combustion chamber:
- Combustion chamber is completely cooled by heat transfer fluid, walls of the combustion chamber creates exchanger. Combustion chamber cooling minimizes inherent ash sintering
Perfect automation of the boiler:
- Boiler runs in full-automatic operation, the combustion is optimised on the basis of under-pressure in the combustion area and through a surplus of oxygen in the combustion products
- The fuel feed and the movement on the grate is regulated in accordance with the fuel’s characteristics
- All measured quantities, interventions of the safety equipment and defects are transmitted to the dispatching system
Main Advanges of boilers Vesko-S:
- cutting the straw bales in cutting device has a minimum energy demands, there is not necessary any other adjustment of
the straw bale before entering the boiler (for example removing a rope), load of the knife is minimal, there is no need to
change it often - construction of combustion chamber – the water cooled walls provide sufficient cooling of the flue gases, which prevents the
creation of waste gases on the grate - the proven construction with the automatic control minimizes the needs of the operator – only fuel transport under the
stacker, the monitoring of the parameters in the control room and the basic maintenance - environment-friendliness, long lifetime, easy maintenance