DE3242968A1 - Feed water control and vaporiser protection - Google Patents

Feed water control and vaporiser protection

Info

Publication number
DE3242968A1
DE3242968A1 DE19823242968 DE3242968A DE3242968A1 DE 3242968 A1 DE3242968 A1 DE 3242968A1 DE 19823242968 DE19823242968 DE 19823242968 DE 3242968 A DE3242968 A DE 3242968A DE 3242968 A1 DE3242968 A1 DE 3242968A1
Authority
DE
Germany
Prior art keywords
feed water
water supply
combustion chamber
regulating
supply
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
DE19823242968
Other languages
German (de)
Other versions
DE3242968C2 (en
Inventor
Georg 7120 Bietigheim-Bissingen Bothe
Reinhold Dipl.-Ing.Dr. 7303 Neuhausen Leithner
Johann 6601 Klein-Blittersdorf Schleßing
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.)
Leithner Reinhard Prof Drtechn 3300 Braunsch
Original Assignee
EVT Energie und Verfahrenstechnick GmbH
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 EVT Energie und Verfahrenstechnick GmbH filed Critical EVT Energie und Verfahrenstechnick GmbH
Priority to DE19823242968 priority Critical patent/DE3242968C2/en
Publication of DE3242968A1 publication Critical patent/DE3242968A1/en
Application granted granted Critical
Publication of DE3242968C2 publication Critical patent/DE3242968C2/en
Expired legal-status Critical Current

Links

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
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

To protect steam generators against interruptions and subsequent damage, a process for control of the feed water supply or for emergency switch-off of the steam generator is proposed, in which the wall temperature of the combustion chamber is measured at many places one behind the other on the flow side, the measured values are compared with a predetermined temperature profile, and when there is a deviation from the predetermined temperature profile, the supply of feed water is altered or, when predetermined maximum temperatures are exceeded, the steam generator is switched off. Furthermore, wall temperature differences, which are a measure for the heat flux density, are used for the control of the feed water, taking account of the enthalpy of the feed water before or after the economiser.

Description

SPEISEWASSERREGELUNG UND VERDAMPFERSCHUTZFEED WATER CONTROL AND EVAPORATOR PROTECTION

Die Erfindung betrifft ein Verfahren zur Regelung der Speisewasserzufuhr von Dampferzeugern bzw. zu deren Notabschaltung.The invention relates to a method for regulating the feed water supply of steam generators or their emergency shutdown.

Bei den bisher bekannten Zwangdurchlaufdampferzeugern wurde die Durchströmung der arbeitsmittelführenden- Teile nicht automatisch, sondern durch das Betriebspersonal, unter Benutzung von optischen oder akustischen Signalen zur Feststellung einer Überschreitung zulässiger Temperaturen nach den Verdampferwänden, überwacht. Örtliche Übertemperaturen werden in den Verdampferwänden nicht erfaßt und auch nicht Übertemperaturen beim Ans taue des Druckes wegen Strömungsstagnation.In the previously known once-through steam generators, the flow through the work equipment-carrying parts not automatically, but by the operating staff, using optical or acoustic signals to determine if the limit has been exceeded permissible temperatures after the evaporator walls, monitored. Local excess temperatures are not detected in the evaporator walls and neither are excess temperatures during The pressure was thawed because of flow stagnation.

Nachteilig ist es bei einer derartigen Überwachung, daß zwischen der Feststellung einer Störung und der Einleitung von behebenden bzw. schützenden Maßnahmen viel Zeit verloren geht bzw. die Störung nicht erkannt wird und dadurch erhebliche Schäden an den Dampferzeugern verursacht werden können.It is disadvantageous in such a monitoring that between the Detection of a malfunction and the initiation of corrective or protective measures a lot of time is lost or the fault is not recognized and therefore considerable Damage to the steam generator can be caused.

Bei Naturumlauf-Dampferzeugern erfolgt zwar im allgemeinen eine Notabschaltung bei Unterschreiten eines minimalen Wasserstandes. Kritische Übertemperaturen, wie sie im Festdruckbetrieb bei Laststeigerungen durch Druckabsenkung und dadurch vermindertem Umlauf und eventuelle Filmverdampfung bei gleichzeitig überhöhter Feuerleistung auftreten können, werden dadurch nicht vermieden. Ähnliches gilt für Dampferzeuger mit Umwälzung.In the case of natural circulation steam generators, there is generally an emergency shutdown when the water level falls below a minimum. Critical overtemperature, such as it in fixed pressure operation with load increases due to pressure reduction and thereby reduced Circulation and possible film evaporation with simultaneously excessive fire output can occur are not avoided. The same applies to steam generators with upheaval.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, bei dem das Auftreten von Betriebsstörungen schnellstmöglich erfaßt und Sofortmaßnahmen zu ihrer Beseitigung bzw. zum Schutz des Dampferzeugers eingeleitet werden können.The invention is based on the object of creating a method in which the occurrence of operational disruptions is recorded as quickly as possible and immediate measures are taken can be initiated to eliminate them or to protect the steam generator.

Diese Aufgabe wird dadurch gelöst, daß man a) an mehreren strömungsseitig hintereinanderliegenden Stellen die Wandtemperatur der Brennkammerrohre mißtv die Meßwerte mit einem vorgegebenen Temperaturprofil vergleicht und bei einem Abweichen der Temperaturen von dem vorgegebenen Temperaturprofil die Speisewasserzufuhr verändert bzw. bei Überschreiten vorgegebener Maximaltemperaturen den Dampferzeuger abschaltet, b) Wandtemperaturdifferenzen, die ein Maß für die Wärmestromdichte darstellen, zur Regelung der Speisewasserzufuhr verwendet, c) aus den Temperaturdifferenzmessungen die Wärmestromdichte an verschiedenen Stellen der Brennkammer ermittelt, daraus die gesamte Wärmezufuhr zur Brennkammer und mit der Enthalpie des Speisewassers vor bzw. nach dem Economizer den Sollwert für den Speisewasserstrom berechnet, d) die Wärmezufuhr zur Brennkammer aus der Brennstoffzufuhr errechnet.This object is achieved by a) at several on the flow side one behind the other, the wall temperature of the combustion chamber tubes measures the Compares measured values with a given temperature profile and if they deviate the temperatures of the predetermined temperature profile changes the feed water supply or switches off the steam generator when the specified maximum temperatures are exceeded, b) Wall temperature differences, which represent a measure of the heat flux density, for Control of the feed water supply used, c) from the temperature difference measurements the heat flux density at various points in the combustion chamber is determined from this the entire heat supply to the combustion chamber and with the enthalpy of the feed water the setpoint for the feed water flow is calculated before or after the economizer, d) the heat supply to the combustion chamber is calculated from the fuel supply.

Die erfindungsgemäßen Maßnahmen haben gegenüber dem bekannten Stand der Technik den Vorteil, daß auftretende Störungen ohne Zeitverlust erfaßt werden und ihnen entgegengewirkt werden kann und dadurch das Risiko eines Schadens am Dampferzeuger weitgehend verringert wird.The measures according to the invention have compared to the known prior art technology has the advantage that occurring faults can be detected without loss of time and they can be counteracted and thereby the risk of damage to the steam generator is largely reduced.

Claims (4)

PATENTANSPRÜCHE rS W Verfahren zur Regelung der Speisewasserzufuhr zu Dampferzeugern bzw. zu deren Notabschaltung, dadurch gekennzeichnet, daß man an mehreren strömungsseitig hintereinander liegenden Stellen die Wandtemperatur der Brennkammerrohre mißt, die Meßwerte mit einem vorgegebenen Temperaturprofil vergleicht und bei einem Abweichen der Temperaturen von dem vorgegebenen Temperaturprofil die Speisewasserzufuhr verändert bzw. bei überschreiten vorgegebener Maximaltemperaturen den Dampferzeuger abschaltet.PATENT CLAIMS rS W Process for regulating the feed water supply to steam generators or to their emergency shutdown, characterized in that one the wall temperature at several points one behind the other on the flow side of the combustion chamber tubes measures the measured values with a predetermined temperature profile compares and if the temperatures deviate from the specified temperature profile the feed water supply changes or when the specified maximum temperatures are exceeded switches off the steam generator. 2) Verfahren zur Regelung der Speisewasserzufuhr nach Anspruch 1, dadurch gekennzeichnet, daß man Wandtemperaturdifferenzen, die ein Maß für die Wärmestromdichte darstellen, zur Regelung der Speisewasserzufuhr verwendet.2) Method for regulating the feed water supply according to claim 1, characterized in that there are wall temperature differences which are a measure of the heat flux density are used to regulate the feed water supply. 3) Verfahren zur Regelung der Speisewasserzufuhr nach Ansprüche 1 und 2, dadurch gekennzeichnet, daß man aus den Temperaturdifferenzmessungen die Wärmestromdichte an verschiedenen Stellen der Brennkammer ermittelt, daraus die gesamte Wärmezufuhr zur Brennkammer und mit der Enthalpie des Speisewassers vor bzw. nach dem Ecpnomizer den Sollwert für den Speisewasserstrom berechnet.3) Method for regulating the feed water supply according to claims 1 and 2, characterized in that the temperature difference measurements Heat flow density determined at various points in the combustion chamber, from which the entire heat supply to the combustion chamber and with the enthalpy of the feed water or the setpoint for the feed water flow is calculated after the Ecpnomizer. 4) Verfahren zur Regelung der Speisewasserzufuhr nach Anspruch 3, dadurch gekennzeichnet, daß man die Wärmezufuhr zur Brennkammer aus der Brennstoffzufuhr errechnet.4) method for regulating the feed water supply according to claim 3, characterized in that the heat supply to the combustion chamber from the fuel supply calculated.
DE19823242968 1982-11-20 1982-11-20 Procedure for regulating the feed water supply to steam generators Expired DE3242968C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19823242968 DE3242968C2 (en) 1982-11-20 1982-11-20 Procedure for regulating the feed water supply to steam generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823242968 DE3242968C2 (en) 1982-11-20 1982-11-20 Procedure for regulating the feed water supply to steam generators

Publications (2)

Publication Number Publication Date
DE3242968A1 true DE3242968A1 (en) 1984-01-12
DE3242968C2 DE3242968C2 (en) 1985-11-14

Family

ID=6178587

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823242968 Expired DE3242968C2 (en) 1982-11-20 1982-11-20 Procedure for regulating the feed water supply to steam generators

Country Status (1)

Country Link
DE (1) DE3242968C2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439765A1 (en) * 1990-01-31 1991-08-07 Siemens Aktiengesellschaft Steam generator
WO1993022599A1 (en) * 1992-05-04 1993-11-11 Siemens Aktiengesellschaft Forced-flow steam generator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB926949A (en) * 1961-02-15 1963-05-22 Sulzer Ag Regulation of forced-flow once-through steam generators

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB926949A (en) * 1961-02-15 1963-05-22 Sulzer Ag Regulation of forced-flow once-through steam generators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Z.: BWK, 1974, Nr.5, S.202-207 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439765A1 (en) * 1990-01-31 1991-08-07 Siemens Aktiengesellschaft Steam generator
US5056468A (en) * 1990-01-31 1991-10-15 Siemens Aktiengesellschaft Steam generator
WO1993022599A1 (en) * 1992-05-04 1993-11-11 Siemens Aktiengesellschaft Forced-flow steam generator
US5529021A (en) * 1992-05-04 1996-06-25 Siemens Aktiengesellschaft Forced once-through steam generator

Also Published As

Publication number Publication date
DE3242968C2 (en) 1985-11-14

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Legal Events

Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: LEITHNER, REINHARD, PROF. DR.TECHN., 3300 BRAUNSCH

8339 Ceased/non-payment of the annual fee