EP3086033A1 - Procédé et dispositif pour le démarrage d'un générateur de vapeur en continu - Google Patents

Procédé et dispositif pour le démarrage d'un générateur de vapeur en continu Download PDF

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Publication number
EP3086033A1
EP3086033A1 EP15164652.8A EP15164652A EP3086033A1 EP 3086033 A1 EP3086033 A1 EP 3086033A1 EP 15164652 A EP15164652 A EP 15164652A EP 3086033 A1 EP3086033 A1 EP 3086033A1
Authority
EP
European Patent Office
Prior art keywords
working fluid
evaporator
stage
supplied
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.)
Withdrawn
Application number
EP15164652.8A
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German (de)
English (en)
Inventor
Jan BRÜCKNER
Martin Effert
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP15164652.8A priority Critical patent/EP3086033A1/fr
Priority to CN201520455343.7U priority patent/CN204806352U/zh
Publication of EP3086033A1 publication Critical patent/EP3086033A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
    • F22B35/10—Control systems for steam boilers for steam boilers of forced-flow type of once-through type

Definitions

  • the invention relates to a method and a device for starting up a continuous steam generator according to the preamble of claims 1 and 5.
  • fired continuous steam generators typically include one or more economizer stages, one or more evaporator stages, and one or more superheater stages.
  • feed water is supplied via a feed water supply to the continuous steam generator as working fluid.
  • This working fluid then flows with a certain mass flow in succession through the individual pipe systems (heating surfaces) of the various stages, where it is heated, evaporated and superheated.
  • Such fired continuous steam generators are usually equipped with a start-up and low-load system, consisting of a Wasserabscheidesystem and a circulating pump.
  • the Wasserabscheidesystem which is located at the output of the last evaporator stage and before a superheater stage, separates unvaporized working fluid from vaporized working fluid.
  • the unevaporated working fluid is returned by means of the circulation pump back into the feed water supply.
  • the start-up or low-load phase with circulating pump in operation is referred to as circulation operation.
  • the unevaporated working fluid is typically vaporized in cyclone separators of the water separation system Working fluid separated and recycled via a water bottle of Wasserabscheidesystems and the circulation pump in the feedwater supply line, while the evaporated working fluid is supplied to the downstream superheater heating surfaces of superheater stages.
  • the working fluid supplied to an evaporator stage at the inlet is distributed over the various parallel tubes of the individual heating surfaces.
  • the evaporators are multi-stage. These stages are usually separated by collectors and can each consist of several parallel heating surfaces.
  • the essential feature is that the entry of the evaporator, a mass flow is supplied, which flows distributed through the heating surfaces and enters the separator. This mass flow is not increased along the flow path until it enters the separators.
  • a uniform distribution of water and steam mixture can not be guaranteed by collectors. Only at very high vapor contents can it be assumed that there is no longer too much segregation of the two phases in the inlet collectors. An uneven distribution of the two phases of water and steam is unfavorable for the tube cooling and the stability of the flow, it also favors temperature imbalances that can lead to damage to the affected heating surface.
  • the object of the invention is to provide a method and a device for starting up a continuous steam generator, which overcomes the disadvantages described above.
  • the continuous steam generator shown in FIG. 1 comprises, in addition to a single economizer stage 10 ', a first evaporator stage 21', two further evaporator stages 22 'and 23' and a superheater stage 90, in which feedwater is fed as a working fluid into steam for a (not shown) stepwise Steam turbine is transferred.
  • the individual stages are formed by bundles of Bank lake Searen or by membrane wall pipes, which are connected to each other via inlet collector and outlet header.
  • the Ecomomizerme shown in FIG 1 10 ' comprises a bundle of tubes 10 via an inlet collector 101 and via an outlet header 102 communicate with each other and thus form a heating surface 10 of the economizer stage 10 '.
  • this outlet collector 232 then includes a Wasserabscheidesystem, which here consists of a so-called cyclone 31 and a water bottle 32 to.
  • a Wasserabscheidesystem which here consists of a so-called cyclone 31 and a water bottle 32 to.
  • water is separated as unevaporated working fluid from the vapor as vaporized working fluid, which is supplied to the subsequent superheater stage 90, and collected in the water bottle 32.
  • Known devices for starting up and operating such a continuous steam generator comprise, in addition to the Wasserabscheidesystem a start-up valve 41 through which the separated, collected in the water bottle 32 and not recirculated water is fed to a flasher 40.
  • the expansion of boiling water in an atmospheric expander 40 produces steam, which is typically discharged via a silencer 42 and water, which can be discharged as wastewater over 43 depending on the quality or fed to the condenser 53 via a condensate collection tank 51 and a condensate pump 52.
  • the guided into the condenser 53 water is thus not lost for the process, but is fed via the preheater 61 and 63 and the feedwater tank 62 again the feed pump 64. It can thus be adjusted via the feed pump 64, a recirculation, however, to water losses leads, as the resulting in the expansion of steam is discharged through the muffler 42.
  • the components start-up valve 41, expander 40, condensate return via 51, 52 and 53 and the feedwater supply of deionized via the supply line 54 are dimensioned so that the possibility exists to approach the system without circulation pump 33.
  • a three-way valve 71 is now on the pressure side of the circulation pump 33, that is, in the known return line 34 to the feed water binding point 35 in addition to the control valve 37 is arranged.
  • a portion of the water from the water bottle 32 can then be guided via a line 72 to an attachment point 73, which is provided at least after a first evaporator stage 21 'and before at least one last evaporator stage 23' ,
  • an attachment point 73 which is provided at least after a first evaporator stage 21 'and before at least one last evaporator stage 23' ,
  • a starting process can be achieved with a maximum increase in the throughput in the evaporator heating surfaces 22 and 23 behind the binding site 73.
  • the burner of the firing system not shown in detail and after filling the evaporator stages 21 ', 22' and 23 ', can be provided with the evaporator minimum flow of the first evaporator stage 21' exclusively via the feed pump 64 before firing.
  • the corresponding mass flow can be effected by means 81 for measuring the flow rate.
  • the three-way valve 71 is connected so that the complete mass flow of the circulation pump 33 is promoted to the binding site 73. If the circulating pump 33 is designed such that it can convey the full BENSON evaporator minimum mass flow, the throughput for the subsequent evaporator heating surfaces is doubled starting at the binding point 73.
  • the mass flow conducted via the line 72 to the binding site 73 can be effected by the measuring device 82. Excess water of the water bottle 32, which is not conveyed via the circulation pump 33, is forwarded via the starting valve 41 to the expander 40.
  • the starting valve 41 can be closed.
  • saturated water which in order to avoid cavitation in the circulation pump 33, in particular in pressure fluctuations in the system by mixing feed water W via the valve 36th is slightly overcooled.
  • the mass flow supplied for subcooling is on the order of 1% to 1.5% of the feedwater mass flow at full load.
  • the starting valve 41 is closed as soon as the water supplied by the feed pump 64 has been completely evaporated in the evaporator heating surfaces 21, 22 and 23. It can then be assumed that there is approximately the vapor content calculated for the BENSON minimum load operating point at the exit of the first evaporator stage 21 '. If working fluid having this vapor content is present at the inlet of the second evaporator stage 22 ', no problems with the distribution at the inlet and with the flow stability can be expected there. Therefore, as soon as the need no longer exists to keep the circulation pump 33 in operation, the delivery rate of the circulation pump 33 can be slowly reduced. Once the cyclone 31 only saturated steam is supplied, the circulation pump 33 is taken out of service and the continuous steam generator is in regular continuous operation. The three-way valve remains in the open position in the direction of line 72 and binding site 73rd
  • the aim of the invention described herein is that to ensure the flow stability and cooling in the second evaporator stage 22 'and the third evaporator stage 23', a mass flow of working fluid is provided as a cooling medium, which exceeds the requirements of the first evaporator stage 21 'with respect to the Minimum mass flow is.
EP15164652.8A 2015-04-22 2015-04-22 Procédé et dispositif pour le démarrage d'un générateur de vapeur en continu Withdrawn EP3086033A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15164652.8A EP3086033A1 (fr) 2015-04-22 2015-04-22 Procédé et dispositif pour le démarrage d'un générateur de vapeur en continu
CN201520455343.7U CN204806352U (zh) 2015-04-22 2015-04-29 直通式蒸汽发生器的启动装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15164652.8A EP3086033A1 (fr) 2015-04-22 2015-04-22 Procédé et dispositif pour le démarrage d'un générateur de vapeur en continu

Publications (1)

Publication Number Publication Date
EP3086033A1 true EP3086033A1 (fr) 2016-10-26

Family

ID=53008316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15164652.8A Withdrawn EP3086033A1 (fr) 2015-04-22 2015-04-22 Procédé et dispositif pour le démarrage d'un générateur de vapeur en continu

Country Status (2)

Country Link
EP (1) EP3086033A1 (fr)
CN (1) CN204806352U (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0777035A1 (fr) * 1995-11-28 1997-06-04 Asea Brown Boveri Ag Centrale combinée à chaudière à pressions multiples
EP0981014A1 (fr) * 1998-08-18 2000-02-23 Asea Brown Boveri AG Centrale d'énergie et procédé pour sa mise en marche et pour la purification de son cycle eau-vapeur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0777035A1 (fr) * 1995-11-28 1997-06-04 Asea Brown Boveri Ag Centrale combinée à chaudière à pressions multiples
EP0981014A1 (fr) * 1998-08-18 2000-02-23 Asea Brown Boveri AG Centrale d'énergie et procédé pour sa mise en marche et pour la purification de son cycle eau-vapeur

Also Published As

Publication number Publication date
CN204806352U (zh) 2015-11-25

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