Read PowerPoint text version

Thermal Efficiency Improvement of Existing Thermal Power Plants in Foreign Countries

21 Jan. 2008 Tokuya Sakurai

Manager of Global Environment Group, Environmental Affairs Department

Introduction

Chubu Electric Power Co., Inc.(CEPCO) has been providing technology to other countries in order to help protect the global environment and improve resource usage. Thailand and Indonesia are becoming more industrialized, and there is strong interest in saving energy. We completed three projects to improve thermal efficiency by improving the operations and facilities of existing thermal power plants.

< In Thailand > 1. Thermal efficiency restoration project Through operational improvement < In the Republic of Indonesia > 2. Thermal efficiency restoration project Through operational improvement 3. Heat efficiency restoration project Through facility conversion (NEDO activity)

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Thermal efficiency restoration project through operational improvements of existing thermal power stations in Thailand

South Bangkok Thermal Power Station

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Project Overview

· Japan-Thailand Thermal Power Environmental Technology Exchange Project · Implemented from 1996 to 2001 · Provided know-how from Japanese thermal power stations to help operation and maintenance · Purpose: Improve thermal efficiency of the South Bangkok Power Station owned by EGAT · Improved thermal efficiency by simply improving operation without renovating the facility

South Bangkok Power Station

EGAT: Electricity Generating Authority of Thailand

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Equipment Outline of the South Bangkok Power Station

Rated Capacity unit MW 1 200 2 3 4 310 5

Year in Commercial Operation

B

Type Flow Rate t/h Fuel Manufacture Steam Press. kg/cm2 Steam Temp. Manufacture -

1971 1972 1974 1976 1978 Natural Forced 635 997 Heavy Oil, Natural Gas Mitsubishi Heavy Industry 126.5 167.0 538 / 538 Mitsubishi Heavy Industry

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

T

Operational Improvement Items

(1) Reduce reheater spray water volume (2) Reduce auxiliary energy consumption a. BWCP Boiler

(Boiler Water Circulating Pump)

Spray

b. GRF

(Gas Recirculation Fan)

BWCP

Turbine Water

GRF

Stack Air

Fuel

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(1) Reduce reheater spray water volume

Initial Data

Latest Data

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(1) Reduce reheater spray water volume

Reasons for RH Spray Increase (1) Scale adhering Deterioration of thermal conductivity (2) Deterioration of HP ST performance Rise of exhaust temperature Rise of RH inlet steam temperature Countermeasures 2 GRF 1 GRF Operation Reducing Recirculating Gas Reduced RH spray water

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(1) Reduce reheater spray water volume

Results

100%

100%

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(2)Reducing Auxiliary Energy Consumption

BEFOR IMPROVEMENT OF BWCP POWER (1996.11/20-12/3

170 160 150 140 130 120 110 100 90 80 70

AFTER IMPROVEMENT OF BWCP POWER (1997.3/18-31)

170 160 150 140 130 120 110 100 90 80 70 Amp(2PUMP) Approximate

B W C P P O W ER (Am p)

y = -7.2198Ln(x) + 190.83

Amp(3PUMP) Approximate

120 140 160 180 200 220 240 260 280 300 320 340

B W C P P O W E R (A m p)

y = -4.0277Ln(x) + 123.77

120 140 160 180 200 220 240 260 280 300 320 340

LOAD(MW)

3 BWCP

2 BWCP

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Project Results

(October 1997 to March 2000) Unit No.3 No.4 No.5 Efficiency improvement (Under rated load) 0.23 0.20 0.13 5,140 kL/year 16,000 t-CO2/year ($0.7million/year) CO2 reduction Fuel Reduction

Causing no costs such as converting costs

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Thermal efficiency restoration project through operational improvements in Indonesia

Site : Suralaya NO.3 unit, Indonesia Power Company

Capacity: 400MW Fuel: coal Operation: Since 1989

Period : 1998 to 2002 Project Outline

(1) Reduce auxiliary electricity (2) Remove unnecessary heat exchangers (3) Water quality management

Result

Efficiency improvement 0.27 CO2 reduction 14,400 t-CO2/year

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Heat efficiency restoration project through facility conversion of existing thermal power stations in Indonesia

Muara Karang Thermal Power Station

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Project Overview

· Requested by the New Energy and Industrial Technology Development Organization (NEDO) · Part of the model project for "Improving Boiler and Turbine Efficiency" · Implemented from 1999 to 2002 · Supplied energy-saving equipment to Indonesia and oversaw their installation

Muara Karang Power Station

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Equipment Outline of Muara Karang Power Station Unit No.5

Rated Capacity Type Flow Rate Fuel Manufacture MW t/h 200 1982 Natural 636 Diesel Oil, Natural Gas Mitsubishi Heavy Industry 126.5 538 / 538 Mitsubishi Heavy Industry

Year in Commercial Operation

B

T

Steam Press. kg/cm2 Steam Temp. Manufacture -

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Facility Conversion Items

(1) Condenser titanium tubes and condenser parts (2) Condenser ball cleaning system (3) Turbine gland seal rings (4) Air preheater elements and seal parts

Air preheater Turbine gland seal rings Condenser tubes

Condenser ball cleaning system

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(1) Condenser Ti Tubes and Condenser Parts

Sludge data from brush condenser tube cleaning (1999) Unit Sludge Muara Karang No.5 25 g/ piece CEPCO 220MW unit 2g / piece

Titanium condenser tubes have better mechanical strength and seawater resistance. Titanium condenser tubes can undergo frequent ball cleaning procedures, which helps to maintain excellent tube cleanliness. Pinholes caused by corrosion are no longer a problem.

River intake

Breakwater

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(2) Condenser Ball Cleaning System

The existing design did not exactly match the equipment. Redesigned the condenser ball cleaning system. -Renewed the ball screen, ball circulation pump, and piping.

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(3) Turbine Gland Seal Rings

The clearance values were much wider than the rated levels because of deformation and deterioration. Turbine gland seal rings were replaced to ensure that clearance is maintained at the rated level.

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

(4) Air Preheater Elements & Seal Parts

Higher thermal efficiency could be achieved by improving the element material and decreasing the exhaust gas temperature. It was necessary to change the element material. -Adopted an enamel coating to steel plate surfaces.

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Equipment Manufacturing

Condenser parts Ball cleaning system

Turbine gland seal rings

Air preheater elements

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Project Results

(2001) Efficiency improvement (Under rated load) 0.72 CO2 reduction Fuel Reduction 6,270 kL/year ($0.8million/year)

18,000 t-CO2/year

Cost for equipment can be recovered within 6 years Possible power output No.5 has been recovered to 200MW from 170MW (Other Items) · Implemented a thermal efficiency management system · Trained Indonesian engineers to manage thermal efficiency

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Summary

It is necessary to reduce energy consumption at a global level in order to solve the problems concerning environment and energy, such as global warming, and most of all, it is required for the developing countries to take energy saving measures, where economic and population present a considerable growth. In Japan, energy saving technology was developed in order to cope with the rise in oil price caused by the two oil crises, and today, the energy efficiency of the Japanese power companies, including our company, has attained the highest level in the world. We hope that our activities contribute to solving various problems concerning environment and energy.

© 2007 Chubu Electric Power Co., Inc. All rights reserved.

Thank you.

Information

PowerPoint

24 pages

Find more like this

Report File (DMCA)

Our content is added by our users. We aim to remove reported files within 1 working day. Please use this link to notify us:

Report this file as copyright or inappropriate

349841