Environmental Protection Activities
of Hokuriku Electric Power Company

Senior Officer & General Manager of Environmental Affairs Dept.
Hiroaki Sono
1

Environmental Protection Activities
of Hokuriku Electric Power CompanyＳｕｂｔｏｐｉｃｓ

1. Historical efforts in the pollution control
2. Current efforts against global warming issue
and activities toward recycling-oriented society2

10^4kWNUCLEARCOALOILHYDROElectricity Generating Capacity

700
600

Coal fired
500
400
300

Oil fired
200
100

90

FY

1985
1980
1975
1970
1965
1960
1955
19195003

Around 1960
public movement against water and air pollutionwas so big a problem
to develop into major pollution lawsuits.

WaterWaterPollution
Pollution

AirAirpollution
pollution

Minamata

Yokkaichi

4Social interest
Deterioration of urban
environment in astable economic growth period.
（1973〜1984）

Pollution caused by heavy industries in a
rapid economic growth period.
（1960〜1972）

Environmental issue
・itai itai disease・minamata disease
・Yokkaichi Asthma

・Photo chemical smog
（1970）
・Severe air pollution
・PCB contamination（1955〜1965）

Environmental protection laws and actions
・Water Control Law（1958）
・Smoke Control Law（1962）

Basic Pollution
Pollution ControlControl Law
Law
Basic（1967）（1967）

Environmental Agency
founded（1971)

Air Pollution
Pollution Control
Control Law
Law
Air（1968）（1968）
Water Pollution
Pollution Control
Control Law
Law
Water（1970）（1970）

Regulation of total
SOx,COD,NOx emission（19７４〜1981）
5SOx Control facilities
1960s

1970s

1980s

1990s

【 JAPAN 】
Research and Development of1972 1973 Ｅｓｔａｂｌｉｓｈｍｅｎｔ of Ｆｕｌｌ-Scale Facilities

1963 Wet-Type desulfurization

Research at Test Plant

Research into

1963 Dry-Typedesulfurization
Activated Carbon Method
Active Manganese Oxide Method

1966 Research at Test Plant 1973

Ｅｓｔａｂｌｉｓｈｍｅｎｔ of Ｆｕｌｌ-Scale Facilities

1967 Research at Test Plant【 Hokuriku EPCo 】▼1974
Half Capacity FGD▼1975
Full Capacity FGD

6

FGD（Flue Gas Desulfurizer）

The gypsum generated from the desulfurizer as a by-product is recycled
as cement material and gypsum board.
7NOx Control facilities
1970s

1980s

1990s

【 JAPAN 】
1972

Use of Two-Stage Combustion and Exhaust-Gas Recirculation

1973

Development of Low-NOｘ Burner Facilities

1973

Research and Development ofFlue Gas Denitrification

1977

Beginning of Research Operation
for Practical Application

1977

Introduction of Flue Gas Denitrofication Facilities【 Hokuriku EPCo 】▼1973
Use of Two-Stage Combustion▼1974
Exhaust-Gas Recirculation▼1981
Flue Gas Denitrofication Facilities▼1978
Low-NOｘ Burner Facilities
Low NOX burner

8ＳＣＲ（Selective Catalyst Reduction）Denitrification Equipment

9SOx and NOx Emission Intensities in OECD Countries

10Electrostatic Precipitator

The electrostatic precipitator uses avoltage differential between twoelectrodes to extract and collect particulates
Particulate

Fly ashCollecting
Electrode

Discharge
Electrode11

The ash collected by electrostatic precipitator is used as cement material.

CoalAsh10%

Fly ash：90%

Clinker ash：10%

Power Plant

Pipe Line

Cement Manufacture12Fly ash

Clinker ash：10%

13

Some of the ash is currently exported to the Republic of Korea○2002 Fly Ash Export begun○Amount of Export：400,000 t（2002〜2008）

Republic of14

Environment Protection Facilities and Tree-Planted Zone at Nanao

Nanao No.1 500MW
Nanao No.2 700MW
15CASOX FGD Process(Demonstration Test)
１．Specification
・Flue Gas Flow Rate
・SO2 Removal Efficiency
・Reactor Size・ Max. Catalyst Bed Height：500m3N/h：90 %：280mmφ：6000mm

２．Test Period
February, 1999〜March, 2001
３．Location
Toyama Shinko Thermal Power Station
Hokuriku Electric Power Company

16Commercial Plant
1．Specification
・Flue Gas Flow Rate
37,000 m3N/h・Inlet SO2 Concentration
1,500 ppmw
・SO2 Removal Efficiency
more than 99.7%
2．Scale-up ： about 74 Times
3．Operation Start ： 2002
4. Application ： Refinery Industry
5．Location ： Osaka
No.1 Plant , where CASOX wasfirst installed
17

CASOX FGD Process

Flue Gas

Catalyst Zone
・Low Pressure Drop・Dust Through

Humidifierc
Proater
es s W

teDiluH 2S

O4Catalyst

Dilute H2SO4

Clean Gas（To Atmosphere)

FGD Reactor18

Ｓｕｂｔｏｐｉｃｓ

1. Historical efforts in the pollution control2. Current efforts against global warming issue
and activities toward recycling-oriented society

19Electricity Generating Capacity
10^4kW

NUCLEARCOALOIL
HYDRO
CO2CO2 Emission Intensity

1000kg-CO2/kWh
0.5

900
800

0.4

700
600

0.3

500
400

0.2

300
0.1

200
100

0
2005

2002

1999

1996

1993

1990

0
FY

20

Improvements in Temperature &Pressure at the inlet of Turbines
Pressure（Mpa）

Temp.（℃）
600

27590
25580
570

23560
21550

Main Steam Temp.

540

Reheat Steam Temp.

530

Main Steam Pressure

1917520
510
1964
1966
1968
197019721974
1976
1978
1980
1982
1984
1986
1987
1989
1991
1993
1995
1997
1999

1521

Thermal power plant efficiency improved
Thermal power output (inEfficiency(%)
100GWh)↑↑↑↑Tsuruga 1 Nanao1 Nanao 2 Tsuruga 2500MW 500MW 700MW 700MW
High efficiency plants in commission※Efficiency：higher heating value standard

22

Introduction of Renewable Energy•Start-up co-combustion of woody biomassin the coal-fired power Plant
Tsuruga No.2 700MWCoalBiomass Siloturbine
generator
Woodｙ biomass
furnace３%

pulverizer•Develop a wind farm and purchase power from wind projects
23

Heat Pump with high COP

24

Promoting 3R (Reduce, Reuse, Recycle)
Ash
Subbase fillings

Used Insulator
Subbase fillings

Plastic Products

Safety coverRecycle

Cement Material

25

Promoting 3R (Reduce, Reuse, Recycle)
Item
Coal ash

Quantity
generated

Efficiently
used amount(t)Efficiently
used rate

757,566

757,566

100.0%

1,160

1,160

100.0%

196,905

196,905

100.0%

Waste plastics forpower distribution

7,412

6,976

94.1%

Scrapped wires andscrap iron

11,07011,015

99.5%

Insulator scraps342

237

69.3%

Scrapped
concrete poles

4,350

4,350

100.0%

Others38,64532,403−

1,017,450

1,010,612

99.3%

Ashes of fuel and oil
GypsumTotal

26

Recycling plastics

wraps, bottles…etc
from households

Recycled plastics

Since 200227

Recycling paper
In the course of paper recycling, document confidentiality is guaranteed.

Erasing

Pick upfrom offices

since 2000

Securestorage

Recycling

Products
28

Thank you

Hokuriku Electric Power Company29