Power, terminal and layout drawings for wood-chip, pellet and CHP heating plants from kW to MW range. ATEX zone concept for wood dust, EMC compliance and integrated fuel-to-combustion-to-flue-gas logic from a single source in Lebring (Styria, Austria).
Eplan and WSCAD for biomass - from single-line to terminal plan.
What this is about
Electrical engineering for the full biomass heating plant - not just the boiler
Wood-chip and pellet heating plants demand electrical engineering that treats fuel handling, combustion control, ash handling, flue-gas cleaning and CHP load management as one integrated system. A biomass heating plant is more than a boiler with a flow sensor: fuel feeding (push, trough or channel conveyors), grate or fluidised-bed combustion, lambda and secondary-air control, heat exchanger, electrostatic or fabric filter, ash handling and an optional CHP module must interact safely and efficiently.
Four planning phases: Fuel -> Combustion -> Lambda -> Flue gas
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Fuel logistics
Single-line of bunker and conveyor drives, push/trough/channel feeders, hydraulics of the grate motion, back-burn dampers. Frequency inverters and safety circuits as a closed logic interlocked against the combustion control.
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Combustion and boiler
Schematics for grate drive, ID fan, primary and secondary air dampers, water temperature and pressure sensing. Interface to boiler safety per EN 12952 (water-tube boilers) or EN 12953 (shell boilers).
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Lambda and secondary air
Sensor layout for the lambda probe at the boiler outlet, wiring to the PLC, actuators for the secondary-air dampers. Foundation for the cascaded lambda control with VFD-driven ID fan.
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Flue gas and ash
Multi-cyclone bypass, electrostatic or fabric filter with differential-pressure monitoring, purge-air and cleaning logic, screw conveyors for grate and fly ash, ash-bin limit switches and CHP connection in the single-line.
What we deliver
Engineering output for a biomass heating plant
Complete, hand-over-ready documentation for plant builders, certifiers and operators - Eplan or WSCAD project plus PDF set.
Drawings and documentation
Single-line and main distribution
Low-voltage switchgear up to 4,000 A, MCC structure, selectivity calculation
Schematics
Multi-pole representation of all power and control circuits (IEC 60617 / IEC 81346)
Terminal and cable lists
Terminal and wiring documentation, cable schedule (IEC 60204-1)
3D layout drawings
Switchgear panel layout in Eplan Pro Panel (EN 61439-1/-2)
Biomass specifics
ATEX zone concept
Wood dust zone 21/22 per EN 60079, components IP6x and matching T-class
Fuel drive diagrams
Push/trough/channel feeders incl. VFD, torque monitoring and back-burn dampers
Combustion control schematics
Lambda probe, secondary-air dampers, draught control, VFD-driven ID fan
Arc-flash sizing — EN 61641, NFPA 70E (on request)
Bus and communication
Profinet
Modbus TCP/RTU
OPC UA
M-Bus (heat meters EN 1434)
EtherCAT
Profibus
IO-Link
PROFIsafe / FSoE
BACnet (municipal)
Standards focus
Standards for biomass electrical engineering
Which standards really matter in the electrical engineering of a biomass heating plant - focus on combustion safety, emissions measurement and low-voltage switchgear assemblies.
Combustion and emissions
EN 50156-1/-2
Electrical equipment for furnaces and ancillary equipment - application planning, installation, safety-related equipment (central for burner management)
EN 303-5
Heating boilers for solid fuels, manually and automatically fired - terms, requirements, testing and marking (applicable in the respective power range)
EN 14181
Quality assurance of automated measuring systems (AMS) - relevant for the later commissioning and authority acceptance
EN 12952 / 12953
Water-tube or shell boilers - safety-related design of boiler interfaces
Electrical safety and machinery
EN 61439-1/-2
Low-voltage switchgear and controlgear assemblies, power switchgear assemblies
EN 60204-1
Electrical equipment of machines - safety
EN 62061 / IEC 61508 / 61511
Functional safety (SIL) for safety-related controls
EMC Directive 2014/30/EU
EMC-compliant wiring and VFD design
Wood dust and environment
ATEX 2014/34/EU + EN 60079
Wood-dust areas zone 21/22 in bunkers, conveyors and storage
BImSchV / IE Directive 2010/75/EU
Emission limits and reporting for medium combustion plants
OeNORM C 4007
Classification of waste wood category A I - A IV for thermal recovery
Component stack
Brand components for biomass switchgear
Vendor-neutral selection by application - Schneider Electric is an official CTB partner; Siemens, B&R and ABB are the other volume suppliers in heating plants.
Schneider Altivar, Siemens SINAMICS, ABB ACS, Danfoss VLT - for ID fan, conveyors and pumps
Mechanical, EX and safety
Enclosures and climatisation
Rittal VX25 / AX / Blue e+, Eldon, Pfannenberg, STEGO
EX components
Bartec, R. STAHL, Pepperl+Fuchs isolation barriers for ATEX zone 21/22
Functional safety
Pilz PNOZmulti, Sick safetyPLC, Siemens Safety Integrated - for burner management per EN 50156
Applications in biomass
Where our biomass electrical engineering is used
Four typical heating-plant profiles, each with its own detail page in the biomass hub - from the municipal wood-chip plant to the waste-wood CHP with ORC.
Eplan project plus PDF set, certifier- and insurer-ready.
Use cases
When customers commission CTB for biomass electrical engineering
Six typical project situations - from greenfield CHP to documentation overhaul of an existing plant.
KWK Kirchschlag CHP
Biomass CHP with ORC module, district-heat feed-out and 24/7 operation - full electrical engineering including ATEX zone concept and CHP synchronisation.
Municipal wood-chip plant
Multi-MW wood-chip heating plant for a local heating grid - fuel handling, push grate, lambda control and electrostatic filter.
Industrial pellet plant
Pellet plant with buffer storage and peak-load boiler - fluid-bed de-ashing and automatic lambda control.
Biomass with district-heat hand-over
Boiler with heat-grid substation - heat meters (EN 1434), flow control and SCADA integration.
Dryer with exhaust recirculation
Fuel pre-drying with dryer exhaust returned as combustion air - balance calculation and VFD sizing.
Re-engineering of existing plant
As-built capture, schematic reconstruction, migration of legacy Eplan 5 or AutoCAD projects to Eplan Electric P8.
FAQ
Frequently asked questions on biomass electrical engineering
ATEX, wood dust and safety
Which ATEX zones must be considered?expand_more
Wood dust typically creates zone 21 inside conveyors and storage and zone 22 in the immediate surroundings. We mark this in the drawings and select components with matching dust-protection class and T-class per EN 60079-31.
How do we plan lambda and secondary-air control?expand_more
The lambda probe at the boiler outlet feeds a cascade controller that drives the secondary-air damper. A VFD-driven ID fan keeps the draught pressure in the firebox constant. The controller logic itself is implemented in the PLC and combustion control phase.
How is ash handling represented?expand_more
Screw conveyors with torque monitoring, ash-bin limit switches and automatic filling logic. The schematics show drives, safety circuits and the interlock against the fuel feed.
Flue gas, CHP and documentation
Do we also plan the flue-gas cleaning?expand_more
Yes. Multi-cyclone bypass, electrostatic or fabric filter with differential-pressure measurement as well as purge-air or cleaning logic are included. When SNCR injection is used, dosing pumps and tank-level sensing are added.
How do we connect a CHP module (ORC) electrically?expand_more
ORC modules (Turboden, Triogen, Adoratec) are typically connected via Modbus TCP, Profinet or OPC UA to the heating-plant PLC. The electrical engineering covers single-line, synchronisation unit and the interface to the heating-grid pump.
How is the documentation handed over?expand_more
Schematics as an Eplan or WSCAD project plus PDF set, along with terminal plans, cable list, BOM and wiring documentation - immediately certifiable and hand-over-ready for certifiers and operators.
Contact
Planning a wood-chip or pellet heating plant?
CTB handles the electrical engineering from fuel feed to heat-grid feed-out - no-obligation initial technical meeting with our heating-plant engineers in Lebring.
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