Anchorage regional landfill landfill gas to energy project
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Anchorage Regional Landfill Landfill Gas-to-Energy Project. Renewable Energy Alaska Project Forum January 11, 2012. Project Organization. Design, build, operates project facilities Own Power Plant and electrical infrastructure. Owns, operates landfill and LFG Collection system

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Anchorage Regional Landfill Landfill Gas-to-Energy Project

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Anchorage regional landfill landfill gas to energy project

Anchorage Regional LandfillLandfill Gas-to-EnergyProject

Renewable Energy Alaska Project Forum

January 11, 2012


Project organization

Project Organization

Design, build, operates project facilities

Own Power Plant and electrical infrastructure

Owns, operates landfill and LFG Collection system

Owns LFG Processing and transmission facilities

Grant Contributor

Power Customer


Anchorage regional landfill

Anchorage Regional Landfill

  • 300,000 tons annually

  • 8 million tons in-place

  • 22 million ton total capacity

  • Expected life – 2050


Landfill gas generation

Landfill Gas Generation

Organic Materials

In

Waste Stream

Anaerobic

Decomposition

Moisture

Heat

Landfill Gas

(CH4, CO2

+ trace organics)


Gas characteristics

Gas Characteristics

  • Typically Makeup - 50% Methane, 50% CO2

  • Typical energy content – 500 BTU/ft3

  • Typical moisture content – saturated

  • May contain other constituents (Oxygen, Nitrogen, VOCs, siloxanes, H2S, etc.)


Lfg generation

LFG Generation

General industry rules of thumb:

  • Each million tons of waste in place has the potential to generate 200-700 cf/min of LFG.

  • Each ton of waste in place has potential to generate 3,900 – 6,600 cf of LFG over the life of the landfill.


Expected lfg generation

Expected LFG Generation

Current LFG Production

2007 ~ 1,000 cfm/ 30 MBtu/hr

2045 ~ 2,200 cfm/ 66MBtu/hr

2017 ~ 1,500 cfm/ 45 MBtu/hr

Estimated Landfill Life

EPA LMOP Generation Model


Proposed project layout

Proposed Project Layout

Gas Processing Facility

Existing Gas Collection System

Existing Blower/Flare Site

Processed Gas Pipeline

Proposed Power Plant


Gas collection system gcs

Gas Collection System (GCS)

Gas Collection System

Purpose:Landfill emission control; collects LFG to central facility

Components:Wells, piping, blowers, flare (constructed by SWS in 2006 with future expansions as needed)

Ownership: SWS

Operator: SWS


Current system in place

Current System in Place

  • Constructed 2006 for air quality compliance.

  • Blower plant

    • 2,400 scfm capacity

  • Enclosed flare

    • 2,000 scfm capacity

  • Gas collection wells and piping

    • 35 vertical wells

    • 12 horizontal wells

    • 8 leachate system connections

  • Continued expansion as landfill ages.


Gas processing system gps

Gas Processing System (GPS)

Purpose:Process gas from field to fuel quality; deliver to Power Plant

Operation:Gas delivered to GPS. Condensate and other undesirable components removed from LFG returned to GCS. DU takes ownership of LFG at Title Point (T). Delivered to Power Plant by pipeline.

Ownership:SWS

Operator:Doyon Utilities

Gas Processing System

LFG

CONDENSATE

LFG

T

PIPELINE

Project Cost:$3.8 million

Component Financing:$2 million from AEA Grant, all other costs paid by DU.


Power generation

Power Generation

ARL

FENCE LINE

LFG

JBER

PIPELINE

JBER Distribution Grid

Power Generation

Components:Generators, switch gear and related controls.

Purpose:Uses LFG as fuel to produce electricity. All power delivered to JBER through Ft. Rich D Street Substation

Ownership: Doyon Utilities

Operator:Doyon Utilities


Power plant

Power Plant

  • Under consideration:

    • 5th generating unit

    • Organic Rankine heat recovery units

  • Jenbacher J420 Generators

    • 1.4 MW per Unit

    • Initial installation – 4 units

    • Operates on either LFG or commercial natural gas

    • Change fuel source on the fly


Contract timeline

Contract Timeline

2011

2012

2013

CONTRACT PERFORMANCE

PERFORMANCE TESTING

DEVELOPMENT

COMMISSION

20 YEARS

90 DAYS

CONTRACT

AWARD

COMMISSIONING

Startup and testing of all components and systems

Gas delivered at no cost.

No minimum gas purchase requirement.

90 day maximum duration.

DEVELOPMENT

Permitting, design, procurement and construction of GPS and Power Plant

No gas sold or delivered.

No minimum gas purchase requirement.


Contract timeline1

Contract Timeline

2011

2012

2013

PERFORMANCE TESTING

CONTRACT PERFORMANCE

DEVELOPMENT

COMMISSION

20 YEARS

90 DAYS

CONTRACT

AWARD

CONTRACT PERFORMANCE

Full system operation.

Tier gas pricing in effect.

Take Or Pay minimum gas purchase requirement.

PERFORMANCE TESTING

Fine tune operation of GCS, GPS and power plant for optimization

All gas sold at contract price.

No min. gas purchase requirement.

Ends latter of 1/1/13, first month after Commissioning or 24 mos. from Contract Award


A win win project

A Win – Win Project

JBER

  • The project will produce ~50% of the JBER power demand

  • Dual fuel capability assures stable power supply

  • Immediate availability of fuel provides more reliable power in emergencies.

Municipality

  • Generates revenue off a waste product.

  • Revenues will offset operating costs which will reflect in user tipping fees.


Landfill gas to energy

Landfill Gas to Energy

Questions?

Contact Mark Madden, P.E.

Director

Municipality of Anchorage

Solid Waste Services

907.343.6279

[email protected]


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