4 eu sout africa clean coal working group · pdf file4th eu sout africa clean coal working...

4th EU Sout Africa Clean Coal Working

Group Meeting

Hybrid Concentrated Solar Power (CSP) Concept – Case

Study for the Medupi Power Stationy

Falk Hoffmeister – Head of Sales and Business Development

Hitachi Power Africa (Pty) Ltd.

Dr. Christian Bergins – Head of R&D

Hitachi Power Europe GmbH

Hitachi Power Africa (Pty) Ltd

Medupi and its potential for hybrid CSP

Hitachi at a glance

Case Study Medupi Hybrid CSP

Medupi & Kusile Steam Generator Design

Outlook

List of open points

1


Key figures Hitachi, Ltd. as of 31 March 2011

* Operating Income,

Eliminations Corporate Items: (153)**, (14,278)***

5,356** Mio. US $

112,239*** Mio. US $

Net Sales Total

Income* Sales

Social Infrastructure & Industrial Systems

Electronic Systems & Equipment

Power Systems

Information & Telecommunication Systems

High Functional Materials & Components

Automotive Systems

Construction Machinery

Financial Services

Others

Digital Media & Consumer Products

Components & Devices

481

449

265

1,188

1018

287

593

172

349

180

526

13,939

13,004

9,798

19,904

16,966

8,890

9,053

4,494

9,247

11,465

9,757

Employees, worldwide ≈ 360,000

2


Thermal power plants

Nuclear power plants

Hydroelectric power plants

Substations and power conversion equipment

Air quality control systems

Power Systems and Equipment

The Power Systems Division of Hitachi, Ltd.

3


Hitachi Power Systems America, Ltd.

Sales bases

Core Group companies

Service bases

Manufacturing and engineering bases

BGR Turbines Company Private Limited

BGR Boilers Private Limited

Power Systems Company Babcock-Hitachi K.K.

Hitachi Power Europe GmbH

Hitachi Power Systems Canada Ltd.

Babcock-Hitachi (Hangzhou) Environmental Equipment Co., Ltd. (Established June 2011)

Procurement bases

Hitachi Power Business Global Structure

Hitachi Power Africa Pty. Ltd.

4


Hitachi Power Africa Main business activities

Conventional power plants

5

Coal fired EPC power plants

Power train

Utility steam generators

Firing systems

Mills

Ash handling systems

Flue gas cleaning systems

Steam turbines (Hitachi, Ltd.)

Combined-cycle power plants

Gas turbines (Hitachi, Ltd.)

Service and Maintenance

Rehabilitation

Modernisation

Service

Spare parts

New Technologies

Carbon Capture - Technology

Renewable Energy & Smart

Community Solutions



List of open points

6

Hitachi at a glance



Outlook


Medupi/ Kusile Power Station, South Africa

6 x 794 MWel / 2290 t/h

Benson® steam generator

Medupi mine bituminous coal

Operation parameters:

SH: 564 °C / 258 bar

RH: 572 °C / 53.2 bar

Net efficiency (LHV): > 40 %

5 Mills type MPS 265

30 DS burner, 78 MW each

Commissioning: 2013-2017

7

Hitachi Power Africa (Pty) Ltd 8

Medupi & Kusile Steam Generator Design Overall plant design



9

Hitachi at a glance



Outlook


Case Study Medupi Hybrid CSP Overview

Solar Steam Generation for Existing Coal-Fired Power Plants

Coal fired power plant

with solar heat integration G

610°C / 55 bar 800 MWel

149 MWth

1490 MWth

fossil solar

LP1 LP2 IP HP


Case Study: Medupi Hybrid CSP Hybrid CSP (Concentrated Solar Power)

11

Solar radiation: 2527 kWh/m² per year


Case Study: Medupi Hybrid CSP Hybrid CSP

12

Solar radiation: 2527 kWh/m² per year

Study items

Fresnel system

for feed water preheating

Combination of direct steam injection

(IP) and feed water preheating

Parabolic trough system

for feed water preheating

for direct steam injection (IP)

G IP LP1 HP LP2

fossil solar


G

M

M

M

M

M

2 x ND

MD

HD

mechanische

Verluste

Generator

Luftkondensator

ND-Vorwärmung

Speisewassertank

Speisewasserpumpe

Kessel

HD-Vorwärmung

Solar field

Steam

Generator HP

IP

Air cooled condenser

Feed water tank

2 x IP

LP pre-heating HP pre-heating Feed water pumps

Case Study: Medupi Hybrid CSP Investigated Hybrid CSP concepts


Case Study: Medupi Solar Argumentation Linear focussed Solar collectors

14

Characteristics of different Solar collector types

Parabolic through

Higher temperature level

Higher optical efficiency

Utilisation of thermo oil as heat transfer medium (HTF) => additional heat exchanger

Utilisation of water under development

Fresnel collectors

Smaler surface area

Cheaper per m² mirror area, but larger mirror area

Utilisation of water as HTF => no additional heat exchanger

Source: [Quaschning, 2009]


Case Study: Medupi Solar Argumentation Linear focussed Solar collectors

15

Characteristics of different Solar collector types

Parabolic through

Higher temperature level

Higher optical efficiency

Utilisation of thermo oil as heat transfer medium (HTF)

Utilisation of water under development

Fresnel collectors

Smaler surface area

Cheaper per m² mirror area, but larger mirror area

Utilisation of water as HTF


Case Study: Medupi Solar Argumentation Basic assumptions

16

Basic assumptions

Technical feasibility study assuming availability of land and water around the

Medupi Power Station

Plant performance data from Medupi power station

Constant plant output during hybrid CSP operation (reduced coal

consumption = > reduced greenhouse gases)

DNI from “MESoR” project; annual solar radiation for Medupi: 2527 kWh/m²

Simulation tool Ebsilon® including special models for Fresnel and Parabolic

Trough collectors


Case Study: Medupi Solar Argumentation Basic assumptions – Ebsilon® Models for CSP technology

17

23 /

23

1 /

23

M

M

Fresnel collector representative for 1 row

1 /

72

72 /

72

M

thermo oil cycle

parabolic

trough collectors

arranged U-type

Fresnel collector model

Parabolic through collector model


Case Study: Medupi Solar Argumentation Net electric efficiency considering coal only

18

41.0 41.0 40.9 40.9

40.30

39.8

40.0

40.2

40.4

40.6

40.8

41.0

41.2

1

Net

ele

ctr

ic e

ffic

ien

cy c

on

sid

eri

ng

co

al

on

ly

[%]

Parabol Bypass

Parabol ZÜ-

Einspeisung

Fresnel Bypass

Fresnel ZÜ-

Einspeisung

Ohne Solar

Parabol, HP heater bypass

Parabol, RH steam

Fresnel, HP heater bypass

Fresnel, RH steam + HP

heater

PP as designed


Case Study: Medupi Solar Argumentation Land demand and collector area

19

Net area

0,222

Gross area

0,680

Net area

0,248

Gross area

0,455

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Area [km²]

Parabolic trough Fresnel collector



20

List of open points

Hitachi at a glance

Case Study Medupi hybrid CSP


Conclusion


Case Study: Medupi Solar Argumentation Results / Conclusion

21

Steam Generator

Steam Generator load during hybrid operation is depending on the scenario

between 87.0 – 90.5 % BMCR

Compensation of different steam generator water/steam conditions via air ratio

Maximum coal reduction ca. 7.5 % (annual average 1.5 – 1.6 %), which is

between 44,250 and 48,130 to => annual CO2 reduction 74,600 – 81,200 to

Overall plant

Fresnel technology for HP heater bypass economically the most viable option

(CO2 abatement cost: 68 €/to CO2 Fresnel versus 156 €/to CO2 Parabolic Trough

Required area 0.25 km² (net) or 0.45 km² (brutto) for Fresnel

Hitachi Power Africa (Pty) Ltd Hitachi Power Europe GmbH · Unternehmenspräsentation 2010

4 eu sout africa clean coal working group · pdf file4th eu sout africa clean coal working...

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