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Retrofitting
Retrofitting

Retrofitting

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  • Introduction
Introduction

Steam turbine retrofitting can make full use of productivity and mechanical raw materials, and can help producers to complete relevant production needs in a timely and effective manner. People can use steam turbine retrofitting to get help in many aspects, such as providing energy for factory production needs, using existing technical conditions to carry out retrofitting of steam turbine, improving use efficiency, reducing energy consumption, bringing more economic and social benefits to enterprises or individuals, and promoting rapid development of productivity and society.

Retrofit of Power Plant with super-critical pressure four casings four exhausts impulse 500MW turbine generating units

(1) Pre-retrofit and post-retrofit technical data comparison

item unit before retrofit after retrofit
supplier LMZ of Former USSR
model of the unit K-500-23.5-4 N550-23.54/540/540
start time of operation 1998 2016
rated/max. output MW 590/550 550/598
design features impulse reaction
speed r/min 3000 3000
main steam pressure MPa 23.54 23.54
temperature 540 540
reheat steam pressure MPa 3.51 3.50
temperature 540 540
efficiency of HP casing % 83 89
efficiency of IP casing % 90 94
Efficiency of LP casing % 72.5 87
back pressure kPa 4.27 / 5.44 4.27 / 5.44
heater 8 8
result of heat rate improvement kJ/kWh standard 550 reduced by appr. 550

(2) Scope of replacement for the retrofit of steam path components

The scope of replacement for the retrofit of steam path components is illustrated in color as below:

企业微信截图_17089161646505

(3) Execution of the retrofit project

·To check and accept the efficiency of casings and level of heat rate in strict conformity with the ITP specification of ASME PTC6-1996.

·Lead time: 12---15 months

·Period of retrofit activities at site: 90---100 days.

(4) Result of retrofit

·The heat rate of steam turbine is to decrease appr. 550KJ/KWh. The coal consumption is to decrease 22g/kwh.

·Annual standard coal saving: approximately 60,000.- tons (based on the annual usage rate of 5000 hours)

·Annual reduction of CO2 emission: appr. 150,000.- tons (based on the annual usage rate of 5000 hours)

·Annual increase of power generation: 250 million KWh (based on the annual usage rate of 5000 hours)

·Payback period of investment: ~ 2 years.

Retrofit of Power Plant with super-critical pressure three casings double exhausts impulse 320MW turbine generating units

(1) Pre-retrofit and post-retrofit technical data comparison

item unit before retrofit after retrofit
supplier Kharkov of former USSR
model of the unit K-320-23.5-4 N340-23.54/540/540
start time of operation 1994.3 2008.12
rated/max. ouput MW 320/335 340/354
speed r/min 3000 3000
main steam pressure MPa 23.54 23.54
temperature 540 540
reheat steam pressure MPa 3.69 3.71
temperature 540 540
extraction steam rated t/h / 50
max. t/h / 70
extraction steam pressure MPa / 0.9
back pressure kPa 4.8 4.8
heater 8 8
result of heat rate improvement kJ/kWh standard 640 reduced by appr. 640

(2) Scope of replacement for the retrofit of steam path components

The scope of replacement for the retrofit of steam path components is illustrated in color as below:

企业微信截图_17089168648870

(3) Execution of the retrofit project

·To check and accept the efficiency of casings and level of heat rate in strict conformity with the ITP specification of ASME PTC6-1996.

·Lead time: 12---15 months

·Period of retrofit activities at site: 70---90 days.

(4) Result of retrofit

·The heat rate of steam turbine is to decrease appr. 640KJ/KWh. The coal consumption is to decrease 25g/kwh.

·Annual standard coal saving: approximately 40,000.- tons (based on the annual usage rate of 5000 hours)

·Annual reduction of CO2 emission: appr. 108,000.- tons (based on the annual usage rate of 5000 hours)

·Annual increase of power generation: 100 million KWh (based on the annual usage rate of 5000 hours)

·Payback period of investment: 2~3 years.

Retrofit of Power Plant with sub-critical pressure three casings three exhausts impulse 300MW turbine generating units

(1)Pre-retrofit and post-retrofit technical data comparison

item unit before retrofit after retrofit
supplier LMZ of former USSR
model of the unit K300-170-3 N320-16.2/540/540
start time of operation 1996 2011.3
rated/max. output MW 300/320 320/336
speed r/min 3000 3000
main steam pressure MPa 16.2 16.2
temperature 540 540
reheat steam pressure MPa 3.53 3.57
temperature 540 540
extraction steam rated t/h / 350
max. t/h / /
extraction steam pressure MPa / /
back pressure kPa 5.6 5.6
heater 8 8
result of heat rate improvement KJ/kWh standard 410 reduced by appr. 410

(2) Scope of replacement for the retrofit of steam path components

The scope of replacement for the retrofit of steam path components is illustrated in color as below:

企业微信截图_17089168717155

(3) Execution of the retrofit project

·To check and accept the efficiency of casings and level of heat rate in strict conformity with the ITP specification of ASME PTC6-1996.

·Lead time: 11---12 months

·Period of retrofit activities at site: about 70 days.

(4) Result of retrofit

·The heat rate of steam turbine is to decrease appr. 410KJ/KWh. The coal consumption is to decrease 16g/kwh.

·Annual standard coal saving: approximately 25,600.- tons (based on the annual usage rate of 5000 hours)

·Annual reduction of CO2 emission: appr. 69,000.- tons (based on the annual usage rate of 5000 hours)

·Annual increase of power generation: 100 million KWh (based on the annual usage rate of 5000 hours)

·Payback period of investment: 2~3 years.

Retrofit of HP & IP casing of Power Plant with high pressure three casings double exhausts impulse 200MW turbine generating units

(1) Pre-retrofit and post-retrofit technical data comparison

item unit before retrofit after retrofit
supplier LMZ of former USSR
model of the unit K215-130-1 C228-12.75/0.245/540/540
start time of operation 1989.10 In year 2000, Siemens performed the retrofit for the LP steam path of the LP casing 2008.11 Quansiwei performed the retrofit for the HP & IP steam path of the HP & IP casing
output rated MW 219.9 228
max. MW 226 235
speed r/min 3000 3000
main steam pressure MPa 12.75 12.75
temperature 540 540
reheat steam pressure MPa 2.40 2.11
temperature 540 540
extraction steam rated t/h / 200
max. t/h / 340
extraction steam pressure MPa / 0.245
back pressure kPa 5.0 5.0
heater 8 8
result of heat rate improvement KJ/kWh standard 243 reduced by appr. 243

(2) Scope of replacement for the retrofit of steam path components

The scope of replacement for the retrofit of steam path components is illustrated in color as below:

企业微信截图_17089168758070

(3) Execution of the retrofit project

·To check and accept the efficiency of casings and level of heat rate in strict conformity with the ITP specification of ASME PTC6-1996.

·Lead time: 9---11 months.

·Period of retrofit activities at site: about 55 days.

(4) Result of retrofit

·The heat rate of steam turbine is to decrease appr. 243KJ/KWh. The coal consumption is to decrease 10.4g/kwh.

·Annual standard coal saving: approximately11,000.- tons (based on the annual usage rate of 5000 hours)

·Annual reduction of CO2 emission: appr. 29,700.- tons (based on the annual usage rate of 5000 hours)

·Annual increase of power generation: 40 million KWh (based on the annual usage rate of 5000 hours)

·Payback period of investment: 2~3 years.


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