Emissions Control Project

Addressing Public Call for Better Air Quality- A Solution to Sustainable Power Generation

Hong Kong Institution of Engineers(Environmental Division)

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Sustainable Power Generation

� CLP’s Proactive Approach

� CLP Generation Portfolio

� Emissions Controls Project

� CLP Energy Vision

Low Carbon Emissions is a Strategic Initiative

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Air emissions reduced by nearly 85% while electricity demand rose 80% in the past 20 years

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Key Responsibilities

� Safe, reliable electricity supply

�World class reliability with less than 3 customer minutes

lost per year

� Affordable electricity price

�Pricing less than comparable world cities such as

Tokyo, Sydney, Singapore, New York and London

� Minimize Environmental Impact

�Carbon intensity has been reduced >30% since mid-90s

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CLP/CAPCO’s Electricity System

Guangzhou Pumped Storage

Black Point

2500 MW

(Natural Gas)

Daya Bay Nuclear

HEC

CLPCLP/CAPCO

2010 Operating Statistics

74%% of Total HK Sales

30,929 GWhCLP/CAPCO Local Sales

5.66 millionPopulation Served

8,888 MWGross Capacity

Castle Peak 4108 MW

(Coal) Penny’s Bay

300 MW

(Oil)

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Castle Peak Power Station

“A” Station• 4 x 350 MW Coal/Oil fired units

“B” Station• 2 x 677 MW Coal/Oil fired units• 2 x 677MW Coal/Oil/Gas fired units

Penny’s Bay Power Station

Total Capacity 6908MW

Black Point Power Station

Power Stations in HK

• 3 x 100 MW Gas Turbine

units; Diesel fired

• 8 x 312.5 MW Gas/Diesel fired Combined Cycle Gas Turbine (CCGT) units

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Daily Plant Utilization

27.9%

22.9%

34.9%

13.2%

1.1%

Nuclear

Black Point

Castle Peak B Coal

Castle Peak A Coal

Pump Storage

Generation Sharing

Nuclear

Black Point

Castle Peak B

Castle Peak A

Pumped Storage

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Hours

MW

NUC27.9%

BKP22.9%

CPK B

34.9%

CPK A

13.2%

PST1.1%

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Black Point Power Station (BPPS)

• Best environmental performance

• High efficiency but relatively high fuel costs

Castle Peak “B’ Station (CPB)

• CAPCO’s flagship coal plant with large relatively high efficiency units

• Sophisticated emissions controls equipment

• One of lowest emissions coal power plants in the world

Castle Peak “A” Station (CPA)

• Older, less efficient coal units

• Uses ultra low sulphur coal to minimize emissions

• Critical generation source provides necessary reserve and peaking requirements

Penny’s Bay Power Station

• Peaking units with shortest start-up time and supplies Lantau in emergency case

Role of Generation Assets

Diverse technologies and fuel types are important to manage supply risks

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Diversified Fuel Mix

Balanced, diversified fuel mix is essential for reliability and good environmental performance

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Year

Nuclear

Oil

Sen

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era

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GW

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CoalGas

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Castle Peak Power Station

The Emission Control Project(Not Just an FGD Project)

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BOFA +

In-duct

SCR to remove

NOx

Existing ESP

Stage

to remove

PM

Flue Gas Desulphurization (FGD)

to remove SO2 and PM

Stack Emissions

Removal Efficiency

50%

90%

99%

NOx: BOFA + In-duct SCR

SO2

PM

BOFA

Coal

Air

Flyash

Ash

Limestone Store

Precipitator

Project Overview - Process Diagram

In-duct SCR

Extensive Relocation & Plant

Modifications

Water, Steam, Gas, Fuel Oil ,

Air, HV Electrical, CO2

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Technical Scope - FGD Technology

Reagents:

Limestone, air (Oxygen)

Process waste water

FGD applies the B&W patented TRAY TOWER which absorbs from flue gas:

Sulfur dioxide, carbon dioxide, hydrogen chloride, hydrogen fluoride, fly ash, soluble oxides of metals

Gypsum

Make up water

Clean Flue gas +

Carbon dioxide

Key factors affecting process efficiency:

1. Reactivity of limestone

2. Encountering time of flue gas with slurry

3. FGD by-passed during oil burner in services

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FGD Island (SO2 reduction)

• Limestone consumption 37.6 te/hr for 4 units

• Gypsum production 64 te/hr for 4 units

• In conjunction with precipitator, remove particulates to meet 2010 RSP target

2. Technical Scope - FGD Overall

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Technical Scope – Boiler Island

BOFA SCR

Reactor

Scope

Urea handling system, urea to ammonia conversion system, ammonia injection system, catalyst, reactor box, ductwork, electrical, control and instrumentation

In-duct Selective Catalytic Reduction (SCR) Units

Booster fans, over-fire air ports, pressure parts, dampers, ductworks, electrical, control and instrumentation, integrated modifications to boiler control

Boosted Over-fire Air (BOFA)

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Technical Scope - NOx Reduction by BOFA

BOILER

BO

FA

BOFA

Principles

Reduce NOx formation by further staging the combustion in boiler

Features

• 300m new ductwork inside the boiler envelop

• High speed injection of combustion air at boiler high level

• 600-tonne steel for structural support

Key factors affecting efficiency

• Not in service during low-load

condition

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Technical Scope - SCR Particulars

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Solution Tank

Grinding Mills

Combined Loader/Unloader

At Material HandlingJetty

Limestone day silos

900 ton x 2

12 Limestone Conveyors

11 Gypsum Conveyors

Limestone

Feeders

Technical Scope - Material Handling Plant

Dewatering belts

Gypsum Store Limestone Store

FGD Absorbers

Emergency Gypsum

Warehouse

Limestone flow

Gypsum flow

Slurry flow

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� Combined ship loader/unloader (capacity 350 t/hr)

� 26 totally enclosed conveyors & 16 transfer towers

Total run of conveyors approx. 2km

� 2 enclosed storage yards

limestone storage capacity : 15,000 te

gypsum storage capacity : 25,000te

Gypsum Storage Yard

Limestone Storage Yard

CPPA coal yard

Gypsum

store

Supporting Facilities

Technical Scope - Major Material Handling Systems

Gypsum Storage Yard

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Technical Scope - WWTP

Waste Water Treatment Plant

Waste

water

from

FGD

Effluent

Sludge

discharged to the sea.

goes to reuse water

system.

Treatment in 3 stages including

physical; chemical and biological

process.

� Off-take as low grade gypsum

for commercial use.

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Before

After

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The Emissions Control Project- A Major Undertaking

A complex project involving installation of equipments in an existing plant that provides

approximately 1/3 of CLP’s electricity supply

Extensive relocation works

Limited footprint - Limited outage windows

Maintaining a reliable electricity supply is a must throughout the project

Special customization of emissions control equipment to meet specific site and plant

conditions

Construction completed in phases from 2009 to 2010

Supports a regional environmental initiative

Completed with over 12million man-hours

Over 10 million without a safety or environmental issue

Better performance in all areas than that targeted by the respective governments

Completed to budget and ahead of schedule

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CLP is facing increasingly stringent emissions targets

RSP - 57% SO2 - 48%

NOX - 32%

RSP - 33%

SO2 - 64% NOX - 34%

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iss

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KT

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1997

(Base Year)

2010 2015 2020

?

NOx

SO2

RSP

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Strong public call and policy drive for better air quality and low carbon emissions

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Increase use of gas

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� Feasibility study of offshore wind project off Sai Kung of up to 200MW

� supplying 80,000 families

� save 300,000 tonnes of CO2

Promote Renewable Energy Sources

� Supporting small scale renewable energy projects

� Facilitate easier connections to CLP grid

� Provide free technical advice

� >70 projects connected

� CLP’s first commercial standalone renewable energy

� 200 kW (672 solar panels, 2 wind turbines)

� To be completed in 2012 on Town Island

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2007200720072007 2010201020102010 2020202020202020 2035203520352035 2050205020502050

CO

2E

mis

sio

n I

nte

nsit

y (

kg

/kW

h)

Climate Vision 2050 Targets

0.840.80

0.60

0.45

0.20

Declaration of Climate

Vision 2050

5% RE*

~75% Reduction

from 2007 levels

Target tightened

in 2010

+

30% NCE*

+

* RE = Renewable energy / *NCE = Non-carbon-emitting

generation

Ongoing review of targets

0.70

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Our valuesPowering Asia Responsibly:

To provide affordable energy to support the development of the Asia-Pacific

region in a financially sound manner while minimising the environmental

impacts of power generation.

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Powering Asia Responsibly