EP2986910B1 - System und prozess zur vorwärmung von zusatzwasser in dampfkraftwerken mit prozessdampfauskopplung - Google Patents

System und prozess zur vorwärmung von zusatzwasser in dampfkraftwerken mit prozessdampfauskopplung Download PDF

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Publication number
EP2986910B1
EP2986910B1 EP13779573.8A EP13779573A EP2986910B1 EP 2986910 B1 EP2986910 B1 EP 2986910B1 EP 13779573 A EP13779573 A EP 13779573A EP 2986910 B1 EP2986910 B1 EP 2986910B1
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EP
European Patent Office
Prior art keywords
water
condensate
condenser
heat exchanger
steam
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EP13779573.8A
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German (de)
English (en)
French (fr)
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EP2986910A1 (de
Inventor
Ingo Assmann
Tim Neuberg
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Siemens AG
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Siemens AG
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Priority to PL13779573T priority Critical patent/PL2986910T3/pl
Priority to EP13779573.8A priority patent/EP2986910B1/de
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    • 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
    • F22D1/34—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines and returning condensate to boiler with main feed supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/44—Use of steam for feed-water heating and another purpose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • 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
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B9/00—Auxiliary systems, arrangements, or devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/40—Use of two or more feed-water heaters in series

Definitions

  • the present invention relates to a system for feeding makeup water and preheating it into a water-steam cycle in a steam power plant. Furthermore, the present invention relates to a method for degassing make-up water in a water-steam cycle in a steam power plant.
  • the water-steam cycle When decoupling process steam / heat in steam power plants, the water-steam cycle must be refilled by means of the continuous supply of make-up water due to leaks and losses of process steam / condensate.
  • the make-up water is usually treated, but not degassed.
  • the additional water contains dissolved foreign gases, which must be expelled again in a degasser of the steam power process. In order to increase the process efficiency, the additional water must be preheated before entering the degasser.
  • make-up water also called makeup water
  • makeup water a conventional degassing
  • make-up water can be fed directly into a turbine condenser or into a low-pressure preheater.
  • this variant can only be used for smaller amounts of make-up water.
  • FIG. 2 Another conventional system for supplying make-up water is shown in a water-steam cycle.
  • the condensate from a conventional condenser 201 is pumped through a conventional condensate pump 202 into a container 204.
  • a mass flow m z of the make-up water is mixed in via a conventional supply line 203.
  • the water mixture is then pumped by another condensate pump 205 through conventional heating devices 206, 208 of the water-steam cycle into the conventional degassing device 209.
  • the water mixture is not degassed due to the additional water content and thus contains dissolved and corrosive media (eg oxygen), all containers, lines and fittings, including the container 204, must be made of corrosion-free stainless steel up to the conventional degassing device.
  • the water is supplied to a conventional evaporator 207.
  • DE 10 2005 040 380 B3 discloses a condensation process. Abdampf of a turbine is fed to an air-cooled condenser for condensation. The condensate recovered in the condenser is pre-heated in a Kondensat stiir Anlagenrmnote before it is fed from a feed pump upstream of the turbine evaporator. The condensate is heated by a partial steam flow of the turbine. Parallel to the condensate warm-up stage, a degasser for degassing make-up water is connected. A partial steam flow from the condenser is condensed by supplying the colder additional feed water. The additional feed water is heated and degassed at the same time. The degasser thus serves as a second downstream condensation stage.
  • EP 1 093 836 A1 discloses a degassing system for power plants.
  • the degassing system is used for gasification of an additionally supplied make-up water, which is connected as part of the condensation system of the power plant with a capacitor. From a make-up tank additional water is fed directly to the degassing system.
  • EP 0 158 629 A2 discloses a steam cycle for steam power plants.
  • steam from a turbine is cooled and condensed.
  • the steam heat exchanger is supplied with additional water from a feedwater degasser.
  • WO 2012/090778 A1 discloses a condensate flow rate control apparatus and a power plant control method.
  • a power plant is equipped with a condensate flow rate control device.
  • a breather is provided in which a condensate generated in a condenser is supplied via a breather water level control valve and into which the bleed steam from a steam turbine is introduced.
  • the condensate flow rate control device has a water level adjusting device for performing the condensate flow rate control.
  • the water level adjusting means adjusts the pressure in the condensate flow path from the breather water level adjusting valve to the breather so that input frequency fluctuations are suppressed or so that the output value of a generator corresponds to the input requested load changes, thereby adjusting the discharge steam amount from the steam turbine.
  • This object is achieved with a system for supplying makeup water via an extra condensate make-up water heater of a water-steam cycle in a steam power plant and with a method for degassing make-up water in a downstream degasser of a water-steam cycle in a steam power plant according to the solved independent claims.
  • a system for supplying make-up water to a preheater and / or evaporator of a water-steam cycle in a steam power plant comprises a condenser for condensing water vapor to water, a degassing device for degassing water, a supply line for supplying additional water and a heat exchanger.
  • the condenser for condensing water vapor to water can be fed with steam from a turbine plant of the steam power plant.
  • the degassing device for degassing water is coupled to the condenser such that a first portion of the condensate can be fed to the degassing device.
  • the heat exchanger is coupled to the condenser such that a second portion of the condensate can be fed to the heat exchanger, wherein the heat exchanger is coupled to a feed line such that make-up water can be fed to the heat exchanger.
  • the heat exchanger is set up such that the additional water can be heated by means of the second portion of the condensate.
  • the heat exchanger is coupled to the degassing device in such a way that the heated additional water can be fed to the degassing device.
  • a method for degassing make-up water for an evaporator of a water-steam cycle in a steam power plant is described.
  • Steam power plants are nowadays often used to generate electrical energy.
  • the power required to operate the steam turbine steam is generated in a boiler from previously cleaned and treated water.
  • the temperature and the specific volume of the steam increase.
  • From the boiler of the steam through pipes flows into a steam turbine plant, where it gives a portion of its previously recorded energy as kinetic energy to the turbine plant.
  • a generator is coupled, which converts the mechanical power into electrical power.
  • the expanded and cooled steam flows into the condenser where it is condensed by heat transfer to the environment (for example, fresh water from a river), and accumulates as liquid water at the lowest point of the capacitor.
  • This water is called condensate.
  • About the condensate pumps and preheaters or heating devices through the water is temporarily stored, for example, in a feedwater tank and then fed via another condensate pump again the steam boiler or the evaporator.
  • the water is supplied to the degassing apparatus to remove harmful gases such as e.g. largely remove corrosive oxygen or carbon dioxide.
  • the degassing apparatus may operate by a thermal degassing method or by a chemical degassing method.
  • the thermal degassing method the degassing device is supplied with thermal energy, for example from bleed steam (from the medium-pressure region) of the turbine system, so that the water in the degassing device is "boiled up” and thus heated.
  • the harmful gases such as oxygen and carbon dioxide
  • the physical circumstance is used that with increasing temperature the solubility of gases in liquids decreases.
  • the degassing device condensate from the one hand and additional water, which was previously heated in the heat exchanger, fed.
  • the additional water is necessary because in the water-steam cycle water, or water vapor escapes due to leaks from the water-steam cycle. This relates in particular to plants with external heat consumers, ie plants with a process steam extraction.
  • a heat exchanger which on the one hand receives the second portion of the condensate. Furthermore, a desired amount of make-up water is added to the heat exchanger via a supply line. The heat exchanger is set up, by means of the heat of the second portion of the condensate, the additional water to a to heat desired temperature. The heated additional water is then fed (in particular directly) to the degassing device.
  • the heat exchanger according to the present invention is in particular a condensate / make-up water heat exchanger.
  • the heat-emitting fluid here the second portion of the water or the condensate
  • the heat-absorbing fluid here the make-up water
  • the system according to the invention is energetically very efficient.
  • the make-up water which may contain harmful gases, first mixed in the degassing with the first portion of the condensate.
  • the devices for example, heating devices and condensate pumps
  • the piping which may be present between the condenser and the degassing device need not necessarily be made of corrosion-resistant stainless steel, since these devices and pipelines do not come into contact with the corrosive makeup water come.
  • the system according to the present invention can also use cheaper materials for the devices and pipelines between the condenser and the degassing device.
  • the second portion of the condensate may be at least half smaller than the first portion of the water.
  • the second part of the condensate is the total amount of condensate in particular only after the condenser and after at least one heating device branched off, so that the second portion of water has already been heated by means of a heating device, before the second portion of the water is supplied to the heat exchanger.
  • the heat exchanger is coupled to the degassing device such that the second portion of the condensate is condensate after flowing through the heat exchanger of the degassing device.
  • the second portion of the water is mixed with the make-up water and thus set an average temperature between the second portion of the water and the make-up water.
  • the make-up water is thus also heated.
  • the mixture of the second portion of the condensate and the make-up water is then mixed in the degassing device with the first portion of the water.
  • the heat exchanger may also be coupled to the condenser such that the second portion of the condensate can be supplied to the condenser again after flowing through the heat exchanger.
  • the second portion of the condensate can be mixed again with the water in the condenser and then re-supplied to the water-steam process.
  • the second portion of the condensate after flowing through the heat exchanger, is fed to the condenser and before the heating device and mixed with the total proportion of water from the condenser.
  • the system comprises the heating device for heating the water.
  • the heating device is coupled to the condenser such that the condensate can be fed to the heating device.
  • the heating device is coupled to the degassing device such that the heated water, or at least the first portion of the condensate, the degassing device can be fed.
  • the heating device is set up such that the heating device can be fed with water vapor from the turbine system, in particular from a low-pressure region of the turbine system, of the steam power plant for heating the water.
  • bleed steam is taken from the turbine plant to use the thermal energy of the bleed steam to heat the water after the condenser.
  • the medium-pressure region of the turbine system is an area which is close to the last turbine stage of the turbine system in that the steam still has a relatively high thermal energy but a lower pressure.
  • the heating device is coupled between the condenser and the heat exchanger such that the second portion of the condensate can be branched off after heating the make-up water in the heating device and can be fed to the heat exchanger.
  • the degassing device is set up such that the degassing device for degassing the water (that is, the first portion of the condensate and the additional water heated in the heat exchanger) with water vapor from the turbine system, in particular from the low-pressure region and / or the medium-pressure region of the turbine plant , the steam power plant is fed.
  • the system further comprises a condensate pump, which is arranged to increase the pressure of the water between the condenser and the degassing device.
  • the make-up water is mixed with the condensate only in the degassing device.
  • the make-up water is heated in the condensate / make-up water heat exchanger by a partial flow (the second portion) of the already pre-heated in Niedertownvorskarn (heating devices) second portion of the condensate.
  • the used for heating second portion of the condensate can be removed from any number of upstream Nieder réellevor Anlagenrn and then used in one or more condensate / additional water heat exchangers for preheating the make-up water.
  • Energetically useful is the removal of the second portion of the water (ie the preheating condensate) between the last heating device (low pressure preheater) and the degassing.
  • the used for preheating the second portion of the water (condensate) is fed to the turbine condenser after cooling in the condensate / additional water heat exchanger in an exemplary embodiment again.
  • the second portion of the condensate mass flow diverted to preheat the make-up water is separated by low-energy bleed steam, e.g. preheated from the relaxation process of the steam turbine plant.
  • low-energy bleed steam e.g. preheated from the relaxation process of the steam turbine plant.
  • the cost of equipment can be reduced and reduced e.g. a machine house in its base area are made smaller, because the additional installed preheater for the heating of the additional water can be omitted (these are necessary especially for large additional amounts of water).
  • the costs for the power plant components decrease considerably.
  • a very large additional water mass flow can be processed. This additional water mass flow can exceed the amount of condensate by more than double.
  • Fig. 1 shows a system for supplying make-up water in a water-steam cycle of a steam power plant.
  • a condenser 101 for condensing water vapor into water (this water is referred to below as condensate) can be fed with steam from a turbine plant 105 of the steam power plant.
  • a degassing device 109 for degassing condensate is coupled to the condenser 101 such that a first portion of the condensate of the condenser 101 can be fed to the degassing device 109.
  • the heat exchanger 102 is coupled to the condenser 101 such that a second portion of the condensate of the condenser 101 can be fed to the condensate / make-up water heat exchanger 102, the heat exchanger 102 being coupled to a feed line 103 in such a way that make-up water can be fed to the heat exchanger 102.
  • the heat exchanger 102 is set up in such a way that the additional water can be heated by means of the second portion of the condensate.
  • the heat exchanger 102 is coupled to the degassing device 109 such that the heated additional water of the degassing device 109 can be fed. After the degassing device 109, the water is supplied to an evaporator 107, for example.
  • the heated additional water is fed directly after the heat exchanger 102 in the heater 109 and mixed only in the heater 109 with the first portion or first mass flow m 1 of the condensate of the condenser 101.
  • the heat exchanger 102 may be coupled to the degassing device 109 such that the second portion (or a second mass flow m 2 ) of the condensate can be fed to the degassing device 109 after flowing through the heat exchanger 102.
  • the heat exchanger 102 may be coupled to the condenser 101 such that the second portion of the condensate after flowing through the heat exchanger 102 to the capacitor 101 can be fed.
  • At least one heating device 106 or, for example, a further plurality of further heating devices 108 can be coupled.
  • the heating devices 106, 108 heat the entire mass flow of the water, which flows from the condenser 101 in the direction of the degassing device 109.
  • the second portion (the second mass flow m 2 ) of the condensate can be diverted after passing through all the heating devices 108 and the heat exchanger 102 are supplied.
  • the first portion (first mass flow m 1 ) of the condensate flows after the tapping of the second portion directly into the degassing device 109, in which the first portion of the condensate is mixed with the heated in the heat exchanger 102 additional water m z .
  • the heating devices 106, 108 may be configured such that the heating devices 106, 108 for heating the condensate with steam (bleed steam) from the turbine system 105, in particular from a low pressure region of the turbine system 105, the steam power plant can be fed.
  • bleed steam steam
  • the degassing device 109 is set up in such a way that the degassing device 109 can be fed with water vapor from the turbine system 105, in particular from a low-pressure region of the turbine system 105 of the steam power plant, for degassing the water.
  • a condensate pump 104 may be coupled to increase the pressure of the total mass flow of water downstream of the condenser 101.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Physical Water Treatments (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
EP13779573.8A 2013-07-05 2013-10-18 System und prozess zur vorwärmung von zusatzwasser in dampfkraftwerken mit prozessdampfauskopplung Active EP2986910B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL13779573T PL2986910T3 (pl) 2013-07-05 2013-10-18 System i sposób podgrzewania dodatkowej wody w elektrowniach parowych z wypuszczeniem pary procesowej
EP13779573.8A EP2986910B1 (de) 2013-07-05 2013-10-18 System und prozess zur vorwärmung von zusatzwasser in dampfkraftwerken mit prozessdampfauskopplung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13175367 2013-07-05
EP13779573.8A EP2986910B1 (de) 2013-07-05 2013-10-18 System und prozess zur vorwärmung von zusatzwasser in dampfkraftwerken mit prozessdampfauskopplung
PCT/EP2013/071814 WO2015000536A1 (de) 2013-07-05 2013-10-18 Prozess zur vorwärmung von zusatzwasser in dampfkraftwerken mit prozessdampfauskopplung

Publications (2)

Publication Number Publication Date
EP2986910A1 EP2986910A1 (de) 2016-02-24
EP2986910B1 true EP2986910B1 (de) 2019-06-19

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US (1) US9890948B2 (ru)
EP (1) EP2986910B1 (ru)
CN (1) CN105358909B (ru)
PL (1) PL2986910T3 (ru)
RU (1) RU2631182C2 (ru)
WO (1) WO2015000536A1 (ru)

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US10118108B2 (en) 2014-04-22 2018-11-06 General Electric Company System and method of distillation process and turbine engine intercooler
US10024195B2 (en) 2015-02-19 2018-07-17 General Electric Company System and method for heating make-up working fluid of a steam system with engine fluid waste heat
US10487695B2 (en) 2015-10-23 2019-11-26 General Electric Company System and method of interfacing intercooled gas turbine engine with distillation process
CN105351023B (zh) * 2015-12-11 2017-02-22 苟仲武 冷凝液化废气成分全回收并利用余热发电的方法和装置
US10364979B2 (en) * 2016-08-26 2019-07-30 Daniel Steam, Inc. Boiler feed tank energy recovery system
CN106989433A (zh) * 2017-03-30 2017-07-28 德清县中能热电有限公司 一种潮汐储热系统及潮汐供热方法

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PL2986910T3 (pl) 2019-12-31
CN105358909B (zh) 2017-10-24
US20160138798A1 (en) 2016-05-19
US9890948B2 (en) 2018-02-13
RU2631182C2 (ru) 2017-09-19
EP2986910A1 (de) 2016-02-24
RU2016103736A (ru) 2017-08-10
CN105358909A (zh) 2016-02-24
WO2015000536A1 (de) 2015-01-08

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