Power Plant Construction and QA/QC

Section 2.4– Boiler Auxiliaries

Engineering Technology Engineering Technology DivisionDivision

2

Overview

Section 2.4– Boiler Auxiliaries

• Introduction

• Burners

• Igniters

• Fans

• Air Heaters

• Fuel Prep and Handling

• Pulverized Coal

• Stokers

3

Introduction

Section 2.4– Boiler Auxiliaries

• Auxiliaries allow more heat to be produced.

• Minimizing heat loss is key to maximizing output.

• Efficiency is the key to generation.

• Combustion needs oxygen so airflow is key to heat production.

• Fuel type and size is key to combustion rate.

• Sizing of Auxiliaries is critical.

4

Introduction

Section 2.4– Boiler Auxiliaries

Power Output MW Turbine

Steam Flow Temperature and Pressure

Boiler Capacity Auxiliaries

Under Capacity Over Capacity

Wasted Costs

Wasted Energy

< Desired MW

Maximum Operation

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Burners

Section 2.4– Boiler Auxiliaries

• Fuel

• Natural Gas

• Oil

• Coal Dust

• Quantity

• Boiler Size

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Igniters - Gas

Section 2.4– Boiler Auxiliaries

7

Section 2.4– Boiler Auxiliaries

Igniters - Oil

8

Section 2.4– Boiler Auxiliaries

Igniters - Combination

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Fans –Boiler Supply

Section 2.4– Boiler Auxiliaries

10

Section 2.4– Boiler Auxiliaries

Fans –Boiler Exhaust

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Air Heaters

Section 2.4– Boiler Auxiliaries

Air Temperature

Air Density

Boiler Heat

Boiler Efficiency

12

Fuel Prep and Handling - Coal

Section 2.4– Boiler Auxiliaries

13

Crushed Coal

Section 2.4– Boiler Auxiliaries

14

Pulverized Coal

Section 2.4– Boiler Auxiliaries

50 um - .002”

15

Stoker

Section 2.4– Boiler Auxiliaries

16

Questions?

Section 2.4– Boiler Auxiliaries