BLUNDELL GEOTHERMAL PLANT

PRESENTED BY RENE ANDREWS

Electricity from Geothermal

Developing the Geothermal Resource for Power Generation

Geothermal Well Characteristics Vapor Dominated

Dry Steam Liquid Dominated

Bi-phase Fluids Steam and Brine

Brine

Developing the Geothermal Resource for Power Generation

Geothermal Well Characteristics Vapor Dominated

Dry Steam Liquid Dominated

Bi-phase Fluids Steam and Brine

Brine

Developing the Geothermal Resource for Power Generation

Geothermal Well Characteristics Vapor Dominated

Dry Steam Liquid Dominated

Bi-phase Fluids Steam and Brine

Brine

Know the Geothermal Resource

What properties are presented by the resource? Fluid Pressure at Wellhead Fluid Temperature at Wellhead

What flow can the well support? Is the resource “clean”?

Geothermal Steam Supply

Wellhead Separators

Steam Collection system Condensate

Properties of the Steam Supply 350 Degree F 210 psi

Steam Separators

Brine collection system

Separator efficiency 20 / 80 ratio

Properties of the Brine 350 Degree F

Basics of Power Generation Conservation of Energy Energy Conversion

Chemical to Heat (Typical Thermal Unit) Heat to Mechanical (Steam Driven

Turbine) Mechanical to Electrical (Generator)

Steam Turbines

Binary Turbines

Generators

3 Phase Power

Differences in Conversion Methods

Steam Systems Single Flash Double Flash

Binary System

Single Flash System

Dual Flash System

Binary System

Blundell Plant

Single Flash Design

Single turbine/Single generator

Turbine design data

Generator design data

Condenser design

Addition of Blundell Unit #2 Heat recovery system Historical Brine flow vs Current Brine flow

340 Degree F vs 210 Degree F

Comparison of Condenser design

Wet type Condenser/Cooling Tower.

Dry Condenser. Pros and Cons of

each type.

Brine re-injection

Conservation of resource

Protection of wells Effects of

Temperature Effects of pH

pH Control method Balance of control System Design

complications

Complications of Unit Operation

• Water Induction (Mass water vs steam)

• Scaling Turbine Blades

• Back-pressure Temperature and

Pressure relationship

Gas in Condensate/Circulating Water

Ambient Temperature

Humidity Wind Direction and

Speed