Water-tube steam boiler configurations
DBW and SDW are two water-tube steam boiler lines developed by ENERGO.DESIGN. The boiler type is not selected by capacity alone. The final configuration depends on fuel properties, moisture, ash content, furnace volume, steam parameters, installation constraints and the agreed scope of supply.
DBW — double-drum water-tube boiler
A double-drum configuration for lower and medium steam parameters, where a reliable water-tube design with natural circulation and efficient delivery-block arrangement are important.
Typical application range:
- steam capacity — from 1 to 12 t/h;
- operating pressure — up to 24 bar;
- saturated steam or moderate superheat up to 250 °C.
SDW — single-drum water-tube boiler
A single-drum configuration for duties requiring higher steam capacity, higher steam parameters or operation with a steam turbine.
Typical application range:
- steam capacity — from 7 t/h;
- operating pressure — from 24 bar;
- saturated or superheated steam; current superheated-steam implementation — 320 °C.
Main systems of the boiler unit
The boiler plant scope is defined by the site requirements, fuel characteristics, steam parameters and the agreed scope of supply. This section highlights the key systems that ENERGO.DESIGN can engineer, manufacture or integrate for a specific project task.
Fuel feeding and moving grate
The system feeds fuel from the day bin into the furnace and forms a controlled combustion bed on the mechanized grate. Fuel dosing is handled by a screw or ram feeder, selected according to fuel particle size, moisture, flowability and consistency.
The moving grate agitates and advances the fuel bed through drying, ignition, active combustion and burnout zones. Air supply can be controlled by zones, helping stabilize combustion, adapt the operating mode to the fuel and reduce the risk of incomplete burnout.
Service platforms and maintenance access
Stairs, platforms and service areas are part of the boiler unit design. They provide access to inspection doors, valves, drives, cleaning zones, upper boiler sections and inspection points. This affects safety, operation and practical maintenance.
If platforms and service structures are not included in our scope of supply, ENERGO.DESIGN engineers support equipment integration to preserve access for inspection, cleaning and maintenance.
From fuel to boiler configuration
At the technical concept stage, we assess the fuel as one of the key factors that define the boiler design. What matters is not only the fuel type, but its real characteristics: calorific value, moisture, ash content, particle size, flowability and consistency.
What it defines: furnace volume and geometry, grate area, drying, combustion and burnout zones, zoned air supply, the need for combustion-air preheating and the gas path design.
Why it matters: to ensure stable combustion, complete fuel burnout and reduce the risk of ash sintering. In our calculations, we use not only theoretical methods, but also data accumulated from completed projects.
Suitable fuel profile:
- calorific value: 1,500–5,500 kcal/kg;
- moisture: up to 55%;
- fuel particle size: suitable for mechanical feeding and stable grate combustion;
- ash content and ash melting temperature: assessed separately for each fuel.
Practical experience and potential fuels: projects may consider sunflower husk, oat husk, wood chips, fuel pellets, prepared peat, agricultural residues and biomass mixtures. RDF, fuel waste and other non-standard fuels are assessed separately after extended fuel analysis, gas-cleaning requirements and project conditions are reviewed.
Gallery of completed projects
Photos from the fabrication, installation, and commissioning of steam boilers
