Sludge to Energy
SLUDGE 2 ENERGY (S2E) PORTFOLIO OF SERVICES
As experts in municipal sewage sludge utilisation, we draw on our extensive experience in the planning and implementation of numerous projects. Our comprehensive, well-founded performance in the field of mechanical and process engineering meets the highest demands and thus makes an important contribution to the successful realisation of your project.
Our range of professional services covers a broad spectrum:
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Concept development and feasibility
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Preliminary planning, approval planning and detailed planning
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Turnkey supply, installation and commissioning of the entire plant as general contractor
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Plant operation and operational support
The process
The system design is based on the combination of a sludge dryer and subsequent combustion in a fluidised bed incinerator with state-of-the-art flue gas cleaning and is individually adapted to the specific sewage sludge volumes and customer requirements.
The individual components of the thermal sludge utilisation concept can be varied as required to suit the customer’s specific needs. Maximum efficiency and economy, as well as safety and reliability, are achieved by selecting the best suitable technical solution.
Depending on the specific site conditions, it can be selected from two design versions of the sludge2energy systems for thermal sludge utilisation:
▸ Hot water boiler
▸ Steam boiler
The heart of the incineration concept is a stationary fluidised bed incinerator with an open nozzle floor, optimised for the requirements of thermal sewage sludge utilisation. This flexibly controllable fluidised bed incinerator represents a reliable and safe system with high energy efficiency and minimal pollutant emissions.
Brief description of the technology
The following components are included in every sludge2energy process and are optimally matched to each other, taking into account the quantities of sewage sludge produced and the sludge composition:
- Sludge acceptance and storage area for dewatered sewage sludge to balance varying supply volumes
- Sludge drying for auto-thermal incineration of the sludge
- Flexible combustion control including adjustable conveying line for controlled sludge input
- Condensation of dryer vapours, introduction of vapours/air into the fluidised bed furnace as combustion air
- Stationary fluidised bed furnace with continuous discharge of bed material and contaminants
- Burner for plant start-up and shutdown and balancing unsteady operating states
- Waste heat boiler for heat transmission from flue gas to useable vapour, utilisation of the exhaust steam for heat supply to internal consumers, such as sludge dryerr
- Staged combustion air system to minimize contaminants, such as dioxins, carbon monoxide, organic pollutants and nitric oxides
- Denitrification according to the selective non-catalytic reduction (SNCR) method as first stage of flue gas cleaning
- Fabric filter for pre-separation of the phosphorus-rich flue ash from the flue gas
- Dry flue gas cleaning with sorbent dosing to remove acid pollutants, dioxins and heavy metals (e.g. Hg)
- Fabric filter (sorption filter) to remove reaction products and dust from the flue gas
- Emission measurement station in chimney for the control of all legal emission limits
- Ash discharge and storage of reaction products (10) separately from phosphorus-rich bed ash, boiler ash and pre-separated ash
Further components and options are available depending on the process variants steam boiler system and hot water boiler system, e.g. dry sludge storage or further energetic utilisation via a back-pressure steam turbine with generator.
Sludge to Energy, sewage sludge disposal, S2E, Sewage sludge drying, Sewage sludge incineration
