EP0195298B1 - Dampferzeuger mit einem temperaturgeregelten Parallelrohrsystem - Google Patents

Dampferzeuger mit einem temperaturgeregelten Parallelrohrsystem Download PDF

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Publication number
EP0195298B1
EP0195298B1 EP86102729A EP86102729A EP0195298B1 EP 0195298 B1 EP0195298 B1 EP 0195298B1 EP 86102729 A EP86102729 A EP 86102729A EP 86102729 A EP86102729 A EP 86102729A EP 0195298 B1 EP0195298 B1 EP 0195298B1
Authority
EP
European Patent Office
Prior art keywords
temperature
steam
injection
parallel
line
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.)
Expired
Application number
EP86102729A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0195298A1 (de
Inventor
Hermann Brückner
Lothar Stadie
Franz Lankes
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 AT86102729T priority Critical patent/ATE48184T1/de
Publication of EP0195298A1 publication Critical patent/EP0195298A1/de
Application granted granted Critical
Publication of EP0195298B1 publication Critical patent/EP0195298B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature
    • F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
    • 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
    • F22B35/108—Control systems for steam generators having multiple flow paths

Definitions

  • the invention relates to a steam generator with a temperature-controlled parallel pipe system with the final heating surfaces of the individual strands of the para pipe system upstream injection coolers, with a sensor connected to the steam strands receiving the individual strands for the temperature of the mixed steam behind the parallel pipe system and with one controlled by the sensor and a setpoint specification Control device for the injection cooler, wherein each of the parallel strands is assigned a separate temperature sensor for the steam temperature and this temperature sensor to a temperature controller. are connected.
  • Such a steam generator is known from DE-A-1 816 851.
  • the invention is therefore based on the object of showing a way in which overstressing of individual pipes or strands can be avoided in steam generators with parallel pipe systems without the steam temperature having to be reduced excessively compared to the theoretically permissible steam temperature.
  • the figure is a schematic diagram of a steam generator with a parallel pipe system and the switching arrangement for regulating the temperature in the individual heating surfaces.
  • the feed water flows from below via the economizer and evaporator (not shown here) into a distributor line 2 and from there into the various preheater and final superheater heating surfaces 7 connected in parallel lines 3, 4, 5 and 6 , 8, 9, 10 of the steam generator 1.
  • These heating surfaces can be parts of the outer wall of the boiler or parts of an intermediate or membrane wall.
  • Behind the end superheater surfaces 8, 10 the individual strands open into a steam collecting line 11, which leads to the consumer, generally to the steam turbine (not shown).
  • the temperature sensors 37, 38 installed in the strands leaving the final superheaters 8, 10 are connected to a temperature controller 40, which in turn is connected via a further control logic 41 to the servomotors of the individual control valves 14, 15 of the injection cooler 12, 13.
  • the temperature controller is constructed in such a way that it determines the temperature sensors 37, 38 with the highest and lowest steam temperature at predetermined time intervals and controls the control valve 14, 15 of the injection cooler 12, 13 of the lines 3 to 6 with the highest steam temperature a little further and the control valve 14, 15 of the desuperheater 12, 13 of the branches 3 to 6 with the lowest steam temperature is a little controlled. The temperatures of the individual strands are thus brought closer together.
  • the temperature sensors 27 to 36 on the parallel tubes 17 to 26 of the individual superheaters 8, 10 are each connected to a monitoring logic 42, 43 per final superheater, which they interrogate at predetermined time intervals.
  • the measured values are compared with a predetermined reference value 44, 45 in a comparison stage 46, 47. If a measured value exceeds the reference value, a signal is formed in the comparison stage, which on the one hand blocks the transmission of the signals of the temperature controller 40 via a negation 48 to 51 and an OR function 52 to 55 and at the same time the control valve 14, 15 of the injection cooler 12, 13 of the associated strand 3 to 6 slightly open.
  • the sensor 39 for the steam mixing temperature located in the steam collecting line 11 is connected to a control element 56, which compares this measured value with a preset value 57, in which the steam temperature desired by the consumer is stamped. Depending on whether the measured value is above or below this setpoint, a control command for opening or closing is generated.
  • This measured value is input via an OR gate 58, 59 into the control lines of all control valves 14, 15 of the injection cooler 12, 13.
  • a signal dependent on the position of the control valve can be applied to the second input of these OR gates 58, 59 of each control valve, which signal is absent when the associated control valve is in the extreme position and thus prevents the control valve from being overdriven.
  • the feed water becomes an economizer and an evaporator in the representation of the figure from below via the distribution line 2 into the individual parallel strands 3 to 6 and the preheater and final superheater heating surfaces installed in these strands via a feed water pump (not shown here) 7 to 10 pressed.
  • the feed water is heated in various parallel pipes and then collected again and heated in the parallel pipes 17 to 26 further final superheater heating surfaces 8, 10 to the desired final state.
  • the steam is collected in the associated strands 3 to 6.
  • Each of these heating surfaces or strands connected in parallel then conducts the steam into the collecting steam line 11, which feeds the superheated steam to the consumer, generally a steam turbine.
  • the controlled system is reduced to a single-line system, so that all control valves for this main control need only be adjusted in parallel. This can be done regardless of the respective opening position of the individual control valves of the desuperheaters. Only in the case of end positions are those control commands of the control element 56 which would result in these end positions being exceeded are suppressed.
  • the opposing commands are passed through the division into a closing signal path 60, 61 and an opening signal path 62, 63 and the interposition of OR gates 64 to 67.
  • These OR gates control switching elements 68 to 71 located in the circuit of the servomotors of the control valves.
  • the monitoring logic 42, 43 prevents individual parallel pipes in the heating surfaces of the final superheater or intermediate superheater from being overloaded. This happens by blocking the signal transmission on the part of the temperature controller and the control element in the closing direction while simultaneously opening the control valve of the associated injection cooler.
  • This type of temperature control in the steam generator can also be used in an analogous manner for reheater heating surfaces, for example before the medium and low pressure stage of a steam turbine. It allows the steam generator to move closer to its theoretically just permissible upper power limit without having to fear thermal loads that are impermissible in terms of location or time. As a result, a higher output and a higher efficiency of the steam generator can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Control Of Temperature (AREA)
  • Pipeline Systems (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Control Of Turbines (AREA)
EP86102729A 1985-03-16 1986-03-03 Dampferzeuger mit einem temperaturgeregelten Parallelrohrsystem Expired EP0195298B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86102729T ATE48184T1 (de) 1985-03-16 1986-03-03 Dampferzeuger mit einem temperaturgeregelten parallelrohrsystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853509637 DE3509637A1 (de) 1985-03-16 1985-03-16 Dampferzeuger mit einem temperaturgeregelten parallelrohrsystem
DE3509637 1985-03-16

Publications (2)

Publication Number Publication Date
EP0195298A1 EP0195298A1 (de) 1986-09-24
EP0195298B1 true EP0195298B1 (de) 1989-11-23

Family

ID=6265511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102729A Expired EP0195298B1 (de) 1985-03-16 1986-03-03 Dampferzeuger mit einem temperaturgeregelten Parallelrohrsystem

Country Status (8)

Country Link
EP (1) EP0195298B1 (ja)
JP (1) JPS61213504A (ja)
AT (1) ATE48184T1 (ja)
DE (2) DE3509637A1 (ja)
DK (1) DK161404C (ja)
ES (1) ES8708048A1 (ja)
FI (1) FI84201C (ja)
YU (1) YU33486A (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120325165A1 (en) * 2011-06-21 2012-12-27 Hicks Timothy E Dual path parallel superheater
US9841185B2 (en) * 2013-10-29 2017-12-12 Emerson Process Management Power & Water Solutions, Inc. Steam temperature control using model-based temperature balancing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR729304A (fr) * 1931-02-07 1932-07-21 Sulzer Ag Générateur de vapeur à haute pression contenant une faible quantité de fluide
FR1340917A (fr) * 1962-08-23 1963-10-25 Babcock & Wilcox Co Installation de régulation pour générateur de vapeur
CH488147A (de) * 1968-03-15 1970-03-31 Sulzer Ag Zwanglaufdampferzeuger
DE1776137A1 (de) * 1968-09-27 1971-10-07 Siemens Ag Durchlauf-Dampferzeuger mit mindestens im Bereich der Dampfueberhitzung aufgeteiltem Arbeitsmittelstrom
US4289114A (en) * 1978-09-12 1981-09-15 The Babcock & Wilcox Company Control system for a solar steam generator

Also Published As

Publication number Publication date
FI860864A0 (fi) 1986-02-28
ES553030A0 (es) 1987-09-01
FI84201B (fi) 1991-07-15
DK113186D0 (da) 1986-03-12
DK161404B (da) 1991-07-01
FI84201C (fi) 1991-10-25
JPS61213504A (ja) 1986-09-22
DE3667097D1 (en) 1989-12-28
ES8708048A1 (es) 1987-09-01
DK113186A (da) 1986-09-17
ATE48184T1 (de) 1989-12-15
DE3509637A1 (de) 1986-09-18
YU33486A (en) 1990-10-31
FI860864A (fi) 1986-09-17
DK161404C (da) 1991-12-09
EP0195298A1 (de) 1986-09-24

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