EP1429074A1 - Système et procédé pour alimenter en eau une installation à turbines à vapeur - Google Patents

Système et procédé pour alimenter en eau une installation à turbines à vapeur Download PDF

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Publication number
EP1429074A1
EP1429074A1 EP03028207A EP03028207A EP1429074A1 EP 1429074 A1 EP1429074 A1 EP 1429074A1 EP 03028207 A EP03028207 A EP 03028207A EP 03028207 A EP03028207 A EP 03028207A EP 1429074 A1 EP1429074 A1 EP 1429074A1
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EP
European Patent Office
Prior art keywords
water
valve
line
bypass
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03028207A
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German (de)
English (en)
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EP1429074B1 (fr
Inventor
Toshiaki Intellectual Property Division Nonaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
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Toshiba Corp
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Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP1429074A1 publication Critical patent/EP1429074A1/fr
Application granted granted Critical
Publication of EP1429074B1 publication Critical patent/EP1429074B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • F22D1/325—Schematic arrangements or control devices therefor

Definitions

  • This invention is related generally to a system and a method for feeding water to a steam generator or a boiler in a thermal or a nuclear power generation plant.
  • the present invention is more specifically related to such a system and a method that has a heating line including a heat exchanger and a bypass line for bypassing the heat exchanger by switching valves.
  • a typical prior art feed water system for a steam turbine plant has a heat exchanger as a feed water heater as well as a bypass line for feed water to bypass the heat exchanger.
  • the prior art feed water system also has an inlet bypass valve and an outlet bypass valve to switch between the line through the heat exchanger (or the heating line) and the bypass line.
  • the inlet bypass valve is typically a two-way switching valve disposed at the branch point between the heating line and the bypass line.
  • the inlet bypass valve is used to select one of the two directions -- the heating line or the bypass line.
  • the outlet bypass valve is an isolating valve disposed downstream of the heat exchanger and upstream of the connecting point to the bypass line in the heating line.
  • the inlet and outlet bypass valves each has a piston in a piston chamber for activation of the valve.
  • the pistons When pressure is accumulated in the piston chambers, the pistons are pushed so that the inlet by pass valve can switch over from the bypass line side to the heating line side, and the outlet bypass valve can open. At that time, the water on the other sides of the pistons in the piston chambers is drained out of the systems.
  • the valves are operated quickly utilizing self-water-pressure as a driving source without any other activation source.
  • inlet and outlet valves described above are advantageous in simple structure because self-pressure is utilized as an activation source. However, those inlet and outlet valves cannot be activated, when the required pressure is not available due to the pressure drop across the control valve, for example.
  • a feed water system for feeding water from a condenser to a steam generator in a steam turbine plant, the feed water system comprising: a feed water/condensate water pump for pumping up water from a condenser; a control valve disposed downstream of the feed water/condensate water pump; a heating line disposed downstream of the control valve, the heating line including a heat exchanger for heating water; a bypass line for bypassing the heating line downstream of the control valve: and inlet and outlet bypass valves for water selectively flowing through either the heating line or the bypass line, wherein the inlet and/or outlet bypass valves are activated by pistons which are driven by water pressure, wherein a valve-activation line for providing water pressure to the pistons to activate the pistons is branched from a point between the feed water/condensate water pump and the control valve.
  • a feed water system for feeding water from a condenser in a steam turbine plant, the feed water system comprising: a feed water/condensate water pump for pumping up water from a condenser; a control valve disposed downstream of the feed water/condensate water pump; a heating line disposed downstream of the control valve, the heating line including a heat exchanger for heating water; and a bypass line for bypassing the heating line downstream of the control valve: wherein the inlet and/or outlet bypass valves are activated by pistons which are driven by water pressure, wherein a valve-activation line for providing water pressure to the pistons to activate the pistons is branched upstream of the inlet bypass valve, the valve-activation line including a valve activating water pump to enhance the water pressure.
  • a method for feeding water from a condenser to a steam generator in a steam turbine plant using a feed water system comprising: a feed water/condensate water pump for pumping up water from a condenser; a control valve disposed downstream of the feed water/condensate water pump; a heating line disposed downstream of the control valve, the heating line including a heat exchanger for heating water; a bypass line for bypassing the heating line downstream of the control valve: and inlet and outlet bypass valves for water selectively flowing through either the heating line or the bypass line
  • the method comprising: branching part of pressurized water from the feed water/condensate water pump upstream of the control valve; supplying the branched part of the pressurized water to one side of each of pistons in piston chambers of the inlet and outlet bypass valves to drive the pistons to activate the valves; and draining water on the opposite side of the pistons in the piston chambers
  • FIG. 1 a first embodiment of a feed water system in a steam turbine plant according to the present invention is described referring to Figure 1.
  • Steam drives a steam turbine (not shown) rotate, and condenses into condensate water in a condenser (not shown).
  • the condensate water is pumped up by a feed water/condensate water pump 2 before the water returns back to a steam generator (not shown).
  • a condensate water pump, a heat exchanger and a feed water pump are connected in series in this order. Since the present invention can be applied to both portions related to the condensate water pump and the feed water pump, those pumps are called a feed water/condensate water pump collectively.
  • a control valve 4 is disposed downstream of the feed water/condensate water pump 2 in order to control the flow rate. The control valve 4 causes a pressure drop.
  • An inlet bypass valve 6 is disposed downstream of the control valve 4.
  • the inlet bypass valve 6 is a two-way switching valve and can be switched to form selectively a flow path through a heating line 8 or through a bypass line 10.
  • the heating line 8 has a heat exchanger or a heater 12. Part of the steam generated in the steam generator is extracted into the heat exchanger 12 where the feed water (or the condensate water) is heated.
  • An outlet bypass valve 14 is disposed downstream of the heat exchanger 12. Downstream of the heat exchanger 12 is combined to the bypass line 10, and then, to the steam generator to which the feed water is supplied. In some embodiments, there may be multiple stages in series, each stage including a combination of a feed water/condensate water pump 2 and a heating line 8. In such a case, downstream of the combining point of the heating line 8 and the bypass line 10 may be connected to another feed water/condensate water pump 2 of the next stage.
  • Inlet and outlet bypass-valve piston chambers 24 and 26, respectively, are attached to the inlet and outlet bypass valves 6 and 14, respectively.
  • Inlet and outlet bypass-valve pistons 28 and 30, respectively, are disposed and can be moved reciprocally in the piston chambers 24 and 26, respectively.
  • the pistons 28 and 30 divide the space in their respective piston chambers 24 and 26.
  • the pistons 28 and 30 move together with the valve bodies (not shown) of the inlet and outlet bypass valves 6 and 14, respectively.
  • First and second spaces divided by the inlet bypass-valve piston 28 in the inlet bypass-valve piston chamber 24 have first and second ports 32 and 34, respectively.
  • third and fourth spaces divided by the outlet bypass-valve piston 30 in the outlet bypass-valve piston chamber 26 have third and fourth ports 36 and 38, respectively.
  • the first and third ports 32 and 36, respectively, are commonly connected to a first valve-activation line 44.
  • the first valve-activation line 44 can be drained through a first drain valve 40.
  • the second and fourth ports 34 and 38, respectively, are commonly connected to a second valve-activation line 46.
  • the second valve-activation line 46 can be drained through a second drain valve 42.
  • a third valve-activation line 48 is branched from a point between the feed water/condensate water pump 2 and the control valve 4.
  • An isolating valve 50 is disposed in the third valve-activation line 48.
  • the third valve-activation line 48 is branched downstream of the isolating valve 50.
  • One of the branched lines is connected to a first valve-activation line 44 via a first high-pressure activation-water supply valve 52, and the other of the branched lines is connected to a second valve-activation line 46 via a second high-pressure activation-water supply valve 54.
  • a water-filling line 16 is branched from a point between the control valve 4 and the inlet bypass valve 6.
  • the water-filling line 16 is connected to a point upstream of the heat exchanger 12 in the heating line 8.
  • a drain line 20 is branched from a point downstream of the connecting point of the water-filling line 16 of the heating line 8 and upstream of the heat exchanger 12.
  • the drain line 20 has a drain valve 22.
  • the water-filling valve 18 When the flow path is changed to the heating line 8 side, the water-filling valve 18 is opened and water is guided to the heating line 8, which causes the heating line 8 pressurized.
  • the first high-pressure activation-water supply valve 52 is opened. Then, comparatively high pressure activation water which does not pass through the control valve 4 is supplied to the first port 32 of the inlet bypass-valve piston chamber 24 and to the third port 36 of the outlet bypass-valve piston chamber 26 through the third valve-activation line 48, the first high-pressure activation-water supply valve 52 and the first valve-activation line 44.
  • the second drain valve 42 is opened, which creates the differential pressures across the pistons 28 and 30.
  • the pistons 28 and 30 move toward the sides of the ports 34 and 38, respectively.
  • the inlet bypass valve 6 is turned to the heating line 8 side, and the outlet bypass valve 14 is opened.
  • the first high-pressure activation-water supply valve 52 and the second drain valve 42 are closed first.
  • the first drain valve 40 and the second high-pressure activation-water supply valve 54 remain closed.
  • the second high-pressure activation-water supply valve 54 is opened.
  • the relatively high-pressure activation water which does not flow through the control valve 4 is supplied to the second port 34 of the inlet bypass-valve piston chamber 24 and the fourth port 38 of the outlet bypass-valve piston chamber 26.
  • the first drain valve 40 is opened, which creates the differential pressures across the pistons 28 and 30.
  • the pistons 28 and 30 move toward the sides of the ports 32 and 36, respectively.
  • the inlet bypass valve 6 is turned to the bypass line 10 side, and the outlet bypass valve 14 is closed.
  • the third drain valve 22 is opened to ensure the switchover.
  • the water-filling valve 18, the third drain valve 22, the first drain valve 40, the second drain valve 42, the first high-pressure activation-water supply valve 52 and the second high-pressure activation-water supply valve 54 are closed.
  • the inlet bypass valve 6 and the outlet bypass valve 14 can be activated even when the pressure in the pipe is lower than the pressure needed to valve activation.
  • a valve activation pump 60 is disposed upstream of the isolating valve 50 on the third valve-activation line 48.
  • the water pressure supplied to the first and second valve-activation lines 44 and 46 can be enhanced more.
  • the third valve-activation line 48 may be alternatively branched at a point downstream of the control valve 4.
  • FIG. 3 a third embodiment of a feed water system in a steam turbine plant according to the present invention is described referring to Figure 3.
  • the third valve-activation line 48 is connected to a high pressure source (not shown) other than the feed water/condensate water pump 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
EP20030028207 2002-12-10 2003-12-09 Système et procédé pour alimenter en eau une installation à turbines à vapeur Expired - Lifetime EP1429074B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002358221A JP2004190927A (ja) 2002-12-10 2002-12-10 蒸気タービンプラント給水系統および給水方法
JP2002358221 2002-12-10

Publications (2)

Publication Number Publication Date
EP1429074A1 true EP1429074A1 (fr) 2004-06-16
EP1429074B1 EP1429074B1 (fr) 2007-02-28

Family

ID=32322079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030028207 Expired - Lifetime EP1429074B1 (fr) 2002-12-10 2003-12-09 Système et procédé pour alimenter en eau une installation à turbines à vapeur

Country Status (4)

Country Link
EP (1) EP1429074B1 (fr)
JP (1) JP2004190927A (fr)
AU (1) AU2003262492B2 (fr)
DE (1) DE60312114T2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010054934A2 (fr) * 2008-11-13 2010-05-20 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur à récupération de chaleur
CN104832897A (zh) * 2015-05-18 2015-08-12 深圳市易精制衣设备有限公司 一种蒸汽补偿系统
CN114370631A (zh) * 2022-01-20 2022-04-19 广东韶钢松山股份有限公司 一种高压给水加热器的凝结水回收装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2164631A1 (de) * 1971-12-24 1973-07-05 Babcock & Wilcox Ag Einrichtung zum absichern von hochdruckvorwaermern
DE2727185A1 (de) * 1977-06-16 1978-12-21 Babcock Ag Einrichtung zum steuern von mit eigenmedium beaufschlagten absperr- und umschaltventilen
EP1241323A1 (fr) * 2001-03-15 2002-09-18 Siemens Aktiengesellschaft Procédé de fonctionnement d'une centrale d'énergie à vapeur et centrale d'énergie à vapeur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2164631A1 (de) * 1971-12-24 1973-07-05 Babcock & Wilcox Ag Einrichtung zum absichern von hochdruckvorwaermern
DE2727185A1 (de) * 1977-06-16 1978-12-21 Babcock Ag Einrichtung zum steuern von mit eigenmedium beaufschlagten absperr- und umschaltventilen
EP1241323A1 (fr) * 2001-03-15 2002-09-18 Siemens Aktiengesellschaft Procédé de fonctionnement d'une centrale d'énergie à vapeur et centrale d'énergie à vapeur

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010054934A2 (fr) * 2008-11-13 2010-05-20 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur à récupération de chaleur
EP2224164A1 (fr) * 2008-11-13 2010-09-01 Siemens Aktiengesellschaft Procédé destiné au fonctionnement d'un générateur de vapeur à récupération de chaleur
WO2010054934A3 (fr) * 2008-11-13 2010-10-07 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur à récupération de chaleur
AU2009315819B2 (en) * 2008-11-13 2014-04-17 Siemens Aktiengesellschaft Method for operating a waste heat steam generator
CN102239363B (zh) * 2008-11-13 2015-02-04 西门子公司 用于运行废热蒸汽发生器的方法
US9593844B2 (en) 2008-11-13 2017-03-14 Siemens Aktiengesellschaft Method for operating a waste heat steam generator
CN104832897A (zh) * 2015-05-18 2015-08-12 深圳市易精制衣设备有限公司 一种蒸汽补偿系统
CN114370631A (zh) * 2022-01-20 2022-04-19 广东韶钢松山股份有限公司 一种高压给水加热器的凝结水回收装置

Also Published As

Publication number Publication date
JP2004190927A (ja) 2004-07-08
DE60312114T2 (de) 2007-10-31
AU2003262492B2 (en) 2005-01-13
AU2003262492A1 (en) 2004-06-24
EP1429074B1 (fr) 2007-02-28
DE60312114D1 (de) 2007-04-12

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