Clean Drain System description.pdf

7/27/2019 Clean Drain System description.pdf

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MINISTRY OF ENERGYIRAN POWER DEVELOPMENT CO.

I P D C

PROJECT : 22 COMBINED CYCLE POWER PLANTSYAZD COMBINED CYCLE POWER PLANT

SYSTEM DESCRIPTION

FOR

CREAN DRAIN SYSTEM

CSPINDLE LEAK OFF FLOW WAS CHANGED FROM 0.28 KG/S TO

0.15 KG/S PER EACH LINENov.14.05 Y. S. KWONNov.14.05 H. C. YOO Nov.14.05 C. H. LEE Nov.14.05

B IN CORPORATED MOM DATED 27~31 AUG. AND 08~12 SEP. 04 Nov.09,04 Y. S. KWONNov.09,04 H. C. YOO Nov.09,04 W. Y. LEE Nov.09,04

A FOR CONSTRUCTION July 7,04 Y. S. KWON July 7,04 H. C. YOO July 7,04 W. Y. LEE July 7,04

0 First Issue Apr. 06,04 Y. S. KWON Apr. 06,04 H. C. YOO Apr. 06,04 W. Y. LEE Apr. 06,04

REV DESIGNATION DATE DESIGN DATE CHKD DATE APPROVED DATE

DOCUMENT NO. : MP-YZC-GA-04-SG0-001 REV. CMAPNA C o .( PRIVATE JOINT STOCK )

IRAN POWER PLANT PROJECTS MANAGEMENT Co. CONTRACT NO. : 22-0701/BA/TL PAGE 1 OF 7

ORIGINATOR NO. : YZC-A-SP-441-SDE-006

ORIGINATOR

DOOSAN HEAVY INDUSTRIES &

CONSTRUCTION CO.,LTD. ORIGLOC.

ORIG.DEPT.

PROJ.NAME

DISC.

DOC.TYPE

AREATYPE

SYS.FA.N

SEQ.N.

SH.N. REV. C

FOR CONSTRUCTION


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MINISTRY OF ENERGYIRAN POWER DEVELOPMENT CO.

I P D C

PROJECT : 22 COMBINED CYCLE POWER PLANTSYAZD COMBINED CYCLE POWER PLANT

REVISION REVISIONPAGE

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1 X X Cover (1 of 2) 51

2 X X X Cover (2 of 2) 52

3 X X X X System Description (1 of 5) 53




7 X X System Description (5 of 5) 57

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DOCUMENT NO. : MP-YZC-GA-04-SG0-001 REV. CMAPNA C o .( PRIVATE JOINT STOCK )

IRAN POWER PLANT PROJECTS MANAGEMENT Co. CONTRACT NO. : 22-0701/BA/TL PAGE 2 OF 7

ORIGINATOR NO. : YZC-A-SP-441-SDE-006ORIGINATOR

DOOSAN HEAVY INDUSTRIES &

CONSTRUCTION CO.,LTD. ORIGLOC.

ORIG.DEPT.

PROJ.NAME

DISC.

DOC.TYPE

AREATYPE

SYS.FA.N

SEQ.N.

SH.N. REV. C


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YAZDCombined Cycle

SYSTEM DESCRIPTIONCLEAN DRAIN SYSTEM

DOOSANChangwon, KOREA

Contract No. :22-0701/BA/TL

Doc. No. : MP-YZC-GA-04-SG0-001Originator No. : YZC-A-SP-441-SDE-006

Revision : CDate : Nov. 14, 05

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CLEAN DRAIN SYSTEM

C O N T E N T S

CLAUSE NO. DESCRIPTION SHEET NO.

1.0.0 REFERENCE DRAWINGS 4

2.0.0 INTRODUCTION 4

3.0.0 CLEAN DRAIN SYSTEM CONFIGURATION 4

4.0.0 DESIGN BASIS 6


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CLEANDRAIN SYSTEM

1.0.0 REFERENCE DRAWINGS

Clean drain system P & I diagrams (MP-YZC-GA-02-SG0-001)

HP & LP steam system P & I diagrams (MP-YZC-GA-02-SM0-001)

Auxiliary steam system P & I diagrams (MP-YZC-GA-02-SA0-001)

Condensate system P & I diagrams (MP-YZC-GA-02-HN0-001)

2.0.0 INTRODUCTION

2.1.0 The drain system comprise the following ;

The HP drain header (ALCM10BR001)

The LP drain header (ALCM20BR001)

Condensate spray line (ALCE14BR001)

Flash tank (ALCM30BB001)

Flash tank vent (ALCM31BR001) and drain line (ALCM32BR001)

3.0.0 CLEAN DRAIN SYSTEM CONFIGURATION

3.1.0 The purpose of the drain system ;

Collect the HP steam/HP condensate drain in the flash tank such as high energydrains in the HP steam line and HP steam warm-up line.

Collect the LP steam/LP condensate drain in the flash tank such as high energydrains in the LP steam line, ST gland steam warm-up line and auxiliary steam line.

Reduce the pressure and temperature of the above drains in order to meet thecondenser admission condition by spraying the drains with condensate water inthe HP drain header and allowing the drains to flash in flash tank.

Vent the flash steam and drain the water in the flash tank to the condenser.

3.2.0 HP drains flow paths

The HP drains supply the steam/condensate drain to the HP drain header. The HP drains consist of 1 inch HP steam bypass valve before drain #1

(1LCM51BR001), 1 inch HP steam bypass valve before drain #2(2LCM51BR001), 1 inch HP steam drain #1 (1LCM50BR001), 1 inch HP steamdrain #2 (2LCM50BR001), 1 inch HP steam common line drain (ALCM70BR002),

2 inch HP steam warm-up line drain (ALCM71BR003) and two (2) 1 inch spindleleak off drain lines from HP valves (Siemens scope).


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Each HP drains are connected to 10 inch HP drain header (ALCM10BR001).

A branch from condensate water supply line is taken for supplying of condensatewater to HP drain header. Collected HP drains are mixed with sprayed condensate water. Mixed media are mixed with LP drains in the flash tank.

Flashed steam and condensed water transported to the condenser. Condensate water supply line connected to HP drain header is provided with a

spray nozzle (ALCM10AZ001).

Condensate water shall be provided to HP drain header during initial start-up andnormal operation of the HRSG.

3.3.0 LP drains flow paths

The LP drains supply the steam/condensate drain to the LP drain header. The LP drains consist of 1 inch LP steam bypass valve before drain #1

(1LCM61BR001), 1 inch LP steam bypass valve before drain #2 (2LCM61BR001),1 inch LP steam drain #1 (1LCM60BR001), 1 inch LP steam drain #2(2LCM60BR001), 1 inch LP steam common line drain (ALCM80BR002), 1 inchST gland steam warm-up drain (ALCM91BR001), 1 inch auxiliary steam PCVdownstream drain (ALCM92BR002) and 1 inch auxiliary steam header drain(ALCM90BR001).

LP drains are connected to 6 inch LP drain header (ALCM20BR001). Collected LP drains are mixed with HP mixed media in the flash tank.

3.4.0 Flash tank vent flow path

Flashed steam in flash tank will flow to condenser through vent line(ALCM31BR001)

Self balanced expansion joint (ALCM31AZ001) shall be installed in vent line inorder to absorb the vibration of condenser.

3.5.0 Flash tank drain flow path

Condensate water will be collected in flash tank and will flow to condenser. Condensate water level in flash tank will be always equalized with condenser

water level

3.6.0 Flash tank

Each drain will be collected and mixed in this tank and then mixed media will betransferred to condenser by flashed steam and condensate water.

Flash tank shall have the measurement gauge such as pressure indicator(ALCM30CP501), level indicator (ALCM30CL501) and temperature indicator(ALCMCT501) in order to check the flash tank condition.


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4.0.0 DESIGN BASIS

4.1.0 Drain condition

Maximum drain flow to flash tank will occur during plant start-up because start-upcondition related to flash tank design depends on the plant start-up sequence,especially drain and warm-up sequence.

HP drains condition : 30 bara / 283.8

LP drains condition : 6 bara / 188.8

ST gland steam warm-up drain condition : 15 bara / 240

Auxiliary steam drains condition : 15 bara / 198.29

Condensate spray condition : 22.21 bara / 49

Flash tank inside

Vent kg/s 3.65- Flow

Drain kg/s 1.47

- Pressure bar.a 0.3

- Temperature 69.12

4.2.0 HP steam drains

When the HP steam pressure is reached to the preselected pressure and the warm-

up is completed, the drain valves are closed.

The pressure of 30 bara is selected in consideration of the pressure level formaximum flow of HP steam line drains according to warm-up condition shown in theplant start-up and shutdown procedure.

Warm-up is completed when the steam temperature is higher than the saturationtemperature corresponding to the steam pressure with some superheat tolerance of50 deg.C.

4.3.0 LP steam drains

When the LP steam pressure is reached to the preselected pressure and the warm-up is completed, the drain valves are closed.

The pressure of 6 bara is selected in consideration of the pressure level for maximumflow of LP steam line drains according to warm-up condition shown in the plant start-up and shutdown procedure.

Warm-up is completed when the steam temperature is higher than the saturationtemperature corresponding to the steam pressure with some superheat tolerance of30 deg.C.

4.4.0 HP steam warm-up line drain

HP steam warm-up line drain will be transported to flash tank during the plant start-upaccording to the steam turbine manufacturers instruction. It will not be transported to


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flash tank when HP steam pressure of steam turbine inlet is larger than floor pressure

at HP steam turbine inlet because drain isolation valve will be transferred to automode and kept at closed position.

4.5.0 Condensate water spray

Condensate water shall be supplied to HP drain header continuously to reduce thetemperature of the drains. Condensate water spray design flow is 1.6 kg/s.

4.6.0 ST gland steam warm-up drain

ST gland steam warm-up drain will be continuously transported to flash tank duringthe plant start-up and normal operating period according to the steam turbinemanufacturers recommendation in order to meet the steam quality of seal steam.

4.7.0 Auxiliary steam header drain

Auxiliary steam header drain will be transported to flash tank via steam trap duringthe plant start-up and normal operating period.

4.8.0 Auxiliary steam PCV downstream drain

Auxiliary steam PCV downstream drain will be transported to flash tank via steamtrap during the normal operating period when HP steam supplies to auxiliary steamsystem.

4.9.0 Spindle leak off line drains

Spindle leak off line drains from HP valves of Siemens scope will be transported toflash tank during the plant start-up and shut down according to the steam turbinemanufacturers instruction. It will not be transported to flash tank during normaloperation.

4.10.0 HP steam bypass valve before drain

HP steam bypass valve before drain will be transported to flash tank via steam trap inorder to prevent HP bypass valve from the water corrosion.

4.11.0 LP steam bypass valve before drain

LP steam bypass valve before drain will be transported to flash tank via steam trap inorder to prevent LP bypass valve from the water corrosion.

Clean Drain System description.pdf

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