37.5 MWe Renewable Energy Power Plant Connecticut, USA

The Outotec Advanced Staged Gasifier is classified as an advanced biomass conversion technology under the Connecticut Clean 100 Program.

Plainfield Renewable Energy operates the largest Class I renewable facility in Connecticut. Outotec provided the state-of-the-art Advanced staged gasification system to produce steam from low-cost Construction & Demolition waste and use flexibly also other biomass fuels.

Advanced Staged gasification system represents the most efficient biomass or waste to energy system offered today by Outotec.

Outotec Advanced staged gasification technology was approved to qualify as advanced biomass conversion technology under the Connecticut 100 Program.

The advanced staged gasification system provides an ideal combination of time, temperature and turbulence resulting in high fuel to energy conversion efficiency, very low carbon left in the ash and a very low plant heat rate.

These features enable the plant to excel in the competitive independent power producer market.

Summary

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Customer
Plainfield Renewable Energy
Location
USA
Delivery year
2014
Technology
Advanced Staged Gasifier
Commodity
Biomass
Scope
EPS

Challenge

  • High efficiency requirement for Class I certification
  • Strict emission limits
  • High uptime requirements

Solution

  • Outotec Advanced Staged Gasifier boiler island
  • Supplied to the client as a “metering bin-to-stack” solution

Benefits

  • Improved revenue stream
  • High availability
  • Bed recycling system allows for online tramp removal for reduced downtime.

Clean wood and C&D waste is sorted to remove contaminants, chipped or shredded to four inches (10 cm) or less. Conveyors send the fuel via fuel metering bins into the Advanced Staged Gasification vessel.

Initial heat for starting up the renewable energy facility is provided by overbed and underbed burners fired by biodiesel. A tubular air-to-air heat exchanger is provided to improve efficiency by lowering the flue gas temperature exiting the stack. The fuel is gasified in the fluidized bed area and converted to producer gas. The producer gas rises above the bed and is then fired above the bed. NOx abatement occurs inside the main vessel’s upper vapor space via nozzles that spray aqueous urea into the flue gas, which then reacts with nitrous oxides to form nitrogen, carbon-dioxide and water.

Any remaining inert fuel contaminants, such as metal or rock are removed from the bed continuously during normal operation via Outotec’s proprietary bed material cleaning, handling, and storage system.

Flue gas cleanup is accomplished via dry sorbent injection into the flue gas which then enters a pulse-jet fabric filter baghouse. Over 99% of the particulate matter is removed from the flue gas in the baghouse, after which, an induced draft fan pulls clean flue gas from the baghouse and disperses it via the stack.

Emissions are monitored via a continuous, emissions monitoring system (CEMS) which measures carbon monoxide, oxygen, nitrogen oxides, sulfur dioxides, and opacity.

Scope of Supply:

Outotec´s EPS scope included the design, manufacturing and supply of the advanced staged gasification furnace, Heat recovery boiler and gas cleanup equipment – a typical fuel to stack delivery.

Outotec supplied also the startup support and operator training assistance.

BFB Plant facts:

Fuel consumption: 1100 tons/day
Fuel mix: C&D waste
  Green Biomass
Steam parameters
Flow: 348,2 klb/hr / 43,8 kg/s
Temperature: 955 F / 512 C
Pressure: 1566 psig / 108 bara
Air quality control system
Selective non-catalytic reduction (SNCR) NOx  
abatement system  
Dry sorbent injection  
Pulse-jet fabric filter  
Footprint: 100 ft. x 300 ft.

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