Drying, pyrolysis and gasification of the fuel is carried out in the primary chamber under sub-stoichiometric conditions.

The syn gas generated in the primary chamber is transferred to a separate secondary chamber where final high-temperature oxidation takes place. A proprietary software system monitors and controls the process.

Recovered energy is converted into hot water or steam for delivery of district heating, process steam and/or electricity.

The flue gas is passed through a dry flue gas cleaning system with injection of lime and active carbon. The environmental results are far below EU emission limits.

The ENERGOS design simultaneously achieves:

• Low carbon content in bottom ash (less than 3% TOC)
• High degree of cracking of organic components
• Simultaneous low and stable Carbon Monoxide (CO) and Nitrogen Oxides (NO_x) emissions

Below is a detailed description of the ENERGOS technology

• Fuel Bunker and Transport System
• Thermal conversion
• Heat Recovery Steam Generator (HRSG)
• Energy utilisation system
• Flue-gas cleaning system
• Control and monitoring system
• Utilities

Fuel Bunker and Transport System

• Fuel used in an ENERGOS plant is pre-treated waste. Sufficient pre-treatment consists of shredding and magnetic separation of metals. The plant is equipped with a fuel bunker
• Fuel is delivered to the energy plant and unloaded in the fuel bunker. The bunker hall is operated slightly below atmospheric pressure to reduce the risk of odour. The air is then used in the thermal conversion process
• Fuel is unloaded from the fuel bunker by use of an overhead crane and delivered to gasification unit

Thermal conversion

• The thermal conversion takes place in two stages. Drying, pyrolysis and gasification of the fuel is carried out in the gasification unit under sub-stoichiometric conditions. In the high temperature oxidation unit a staged oxidation is facilitated by multiple injection of air and recycled flue-gas
• The gasification unit is equipped with a fixed horizontal oil-cooled grate that is divided into several separate sections, each with a separate primary air supply
• A water-cooled guillotine is installed at the inlet of the gasification unit to control the thickness of the fuel bed. Hydraulically operated water-cooled scrapers take care of transport of fuel along the grate
• A proprietary software programme controls the fuel-feeding rate into the gasification unit as well as transportation along the grate
• The bottom ash is discharged from the gasification unit at the end of the grate

Heat Recovery Steam Generator (HRSG)

• The HRSG that recovers the energy from the flue-gas is connected downstream of the high temperature oxidation unit
• The HRSG is a combined smoke-tube- and water-tube-boiler equipped with an economiser
• The HRSG is operated to control the outlet flue-gas temperature. The flue-gas boiler is equipped with a feed-water tank, feed-water pumps and facilities for cleaning of the heat transfer surfaces during operation
• Standardised boilers deliver saturated steam (16 bara) or for superheated steam (22 bara, 380 degrees centigrade). Boilers with other steam parameters can be provided 

Energy utilisation system

• The energy utilisation system is project specific and designed to satisfy the requirements of the energy user

Flue-gas cleaning system

• The flue-gas enters the flue-gas cleaning system downstream of the HRSG. The plant is equipped with a dry flue-gas cleaning system consisting of a bag-house filter, a storage silo for lime and activated carbon and a filter dust silo
• Lime and activated carbon is injected at the inlet of the bag house filter
• The lime absorbs acid components in the flue-gas, while activated carbon adsorbs dioxin, TOC and heavy metals 

Control and monitoring system

• The plant is equipped with a separate proprietary control-and-monitoring-system
• The system performs automatic control of the process during normal operating conditions and gives the opportunity to monitor the different process sections through the man-machine interface. All information is available for the operator via a screen
• The system is designed for remote control and monitoring of the plant. Safety and security is paramount in all aspects of the design
• Logging of process parameters, including emissions monitoring parameters, is controlled in a separate data logging system
• Safety is taken care of in a separate and independent emergency shutdown system
• The emissions to air such as dust, CO, HCl, Hg, TOC, SO₂, NO_x, O₂, H₂O and CO₂ are continuously monitored and displayed

Utilities

The ENERGOS plant is equipped with the following utilities:

• Electrical system
• Emergency power generating unit
• Air supply system
• Re-circulated flue-gas system
• Compressed air system
• Hydraulic system
• Water cooling system
• Oil cooling system

ENERGOS contact

ENERGOS contact information:

ENERGOS Limited Tel:+ 44 (0) 845 683 7001 email: info@energos.com  Media Partner: Janet Kilpatrick   Tel: +44 (0) 161 487 3830