Step Trutnov

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  • stationary pressure vesselst
    • horizontal air tank (TN – VS)
    • vertical air chamber (TN - SV)
    • expander (releaser) (TN - SEU)
    • expansion tank (TN - SE)
    • horizontal air tank (TN - L) a horizontal air chamber (TN – LV)
    • expansion tank with a bag (TN - SEV)
    • water tank air chamber with a rubber bag (TN - SVV)
    • vertical storage reservoir (AN-S)
    • horizontal storage reservoir (AN-L)
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    • storage reservoir (VAN - Cu)
    • storage reservoir with floating boiler (AN - B)
  • heat exchangers and water heaters with waste gas burner
    • flue gas water heater
    • flue gas water exchanger
  • water heaters
    • horizontal water heaters OVL-PV, OVL-VV
    • vertical water heaters OVS-PV, OVS-VV
  • heat exchangers
    • exchanger – VT1 – PVS (steam – water, vertical)
    • exchanger – VT2 – PVL (steam – water, horizontal), VVL (water – water, horizontal)
    • exchanger – VT3 – PVL (steam – water, horizontal)
    • exchanger – VT4 – VVL (water – water, horizontal)
    • exchanger – VT4 – VVS (water – water, vertical)
  • water treatment equipmen
    • softening filters
    • water softening cartridge filter – PZF 200
    • water demineralization cartridge filter – PDF 200
  • liquefied gas containers
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    • settling vessels
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  • non pressure vessels
    • non pressure expansion tank
  • other HP components
    • hydraulic bypass
    • splitters / collectors
  • other PV components
    • horizontal vessel bolsters
  • boilers for biomass
    • boilers for burning whole bales of straw 100 - 1000 kW
    • boilers for burning whole bales of straw 600 - 5000 kW
    • boilers for burning wood chips and grains 100 - 1000 kW
    • boilers for burning wood chips and grains 600 - 5000 kW
    • Step Ekopal 40 – 700 KW
  • automated expansion filling and degassing appliance
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Of interest

Map

BOILERS FOR BURNING WOOD CHIPS

(mixtures of sawdust, strips, bark, shavings, forest or industrial wood chips, etc.)

Type and capacity range: STEP-KB 600 ÷ 5,000 kW

Use
This equipment for biomass combustion (mixtures of sawdust, strips, bark, wood chips, shavings, etc.) has been designed to heat buildings with higher demand of heat ( industrial premises, central and municipal heating plants, farm buildings, hotels, operating facilities, etc.).

Boiler type options
We can supply a basic type of boiler, which is a warm-water version as well as hot-water boilers or steam boilers with/without a steam super heater upon customer’s demand.

Boiler description
The equipment consists of a water-tube combustion chamber above a modified overfeed stoker, and a fire-tube exchanger. The combustion chamber is of a water-tube membrane type. The front part is fitted with an inlet fuel neck. The fuel is pushed with a hydraulic feeder above the front part of the stoker. The inlet neck is heated by heating water; thus, the fuel is being pre-dried.
The boilers are supplied with all fittings including insulation and plating. An ash unloading screw conveyor is placed at the end of the stake. Flue gases go out of the combustion chamber to enter a vertical flue gas exchanger. The flue gas outlet from the exchanger is placed in the upper part and can be tailored to the boiler room’s position according to drawings.

Operation and control
There is a step automatic control of the boiler’s capacity with continuous scanning; it is determined by a value of combustion chamber’s vacuum as well as by a number of batches of fuel fed into the fireplace depending on the temperature of the boiler’s output water. The slave fan is operated according to a frequency rpm converter depending on O2 level in flue gases. The exhaust fan placed on a flue gas outlet controls the vacuum set in the chamber.

Fuel
Wood biomass (a mixture of sawdust, strips, bark, forest wood chips, shavings etc.), min. heating value 10.1 MJ/kg, humidity up to 40% %; e.g. beech, birch, oak or spruce. Content of non-combustible matter (dust, sand): max. 0.4 %. Max. size of the wood waste matter up to o 40 mm; length up to 100 mm.

Boiler clearing and cleaning
The ash is unloaded from the chamber automatically by means of a screw transverse conveyor placed in the rear side of the chamber. The heat-delivery surfaces are cleaned mechanically by means of special brushes, and there is an easy-to-dismount door and gate to collect ash.

Transport of fuel
Unloading silo
Fuel is transported from the silo by agitation of an axial feeding bar fitted with a large number of unloading wedges. The feeding bar is driven by a hydraulic cylinder.
The wedges on the feeding bars are designed to pick up the fuel placed in the silo when moving towards the overflow to the hydraulic feeder, and to pass under the fuel when going back. Thus, the fuel is transported to the hydraulic feeder that is placed crosswise to the moving of the feeding bar; here it is collected and moved forward to the boiler’s chamber.
Hydraulic feeder
The feeder works on an identical basis as does the system of unloading from the silo; it is integrated into the control circuit of the boiler, which means that it is activated or deactivated depending on the heat off-take from the boiler (based on the output water temperature from the boiler).
The benefit of this system is that the flow of the fuel can be separated completely at two points, i.e. the wall between the silo and boiler areas and the wall between the refuelling and fireplace areas. This is enabled by a strong counter-knife placed at the points mentioned above, which blocks the feeders equipped with cutting knives each time a feeding cycle is completed or the equipment stops.
This not only provides for the safest protection from any back burning, but also for cutting and easy transporting of larger logs or bark contained in the fuel to the chamber.
Flowchart: Trasport of fuel into the boiler

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