DE415373C - Device to prevent steam formation in flue gas preheaters - Google Patents

Device to prevent steam formation in flue gas preheaters

Info

Publication number
DE415373C
DE415373C DEH99338D DEH0099338D DE415373C DE 415373 C DE415373 C DE 415373C DE H99338 D DEH99338 D DE H99338D DE H0099338 D DEH0099338 D DE H0099338D DE 415373 C DE415373 C DE 415373C
Authority
DE
Germany
Prior art keywords
preheater
flue gas
steam formation
gas preheaters
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
DEH99338D
Other languages
German (de)
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.)
Individual
Original Assignee
Individual
Publication date
Priority to DEH99338D priority Critical patent/DE415373C/en
Application granted granted Critical
Publication of DE415373C publication Critical patent/DE415373C/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
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes or flue ways
    • F22D1/12—Control devices, e.g. for regulating steam temperature

Landscapes

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

Description

Vorrichtung zum Verhüten von Dampfbildung in Hauchgasvorwärmern. Die Erfindung betrifft eine selbsttätige Vorrichtung zum Verhüten von Dampfbildung in Rauchgasvorwärmern bei unterbrochener Kesselspeisung. Wenn in Betriebspausen nicht gespeist wird, tritt im Vorwärmer eine Temperatursteigerung und bei längerer Dauer auch Dampfbildung ein. Beides ist für die Haltbarkeit der Vorwärmer wegen der mit Beginn frischer Speisung eintretenden schnellen Abkühlung und möglichen Wasserschlägen schädlich. Zur Verhütung dieses Übelstandes hat man bereits hinter dem Vorwärmer ein selbsttätiges Umlaufventil eingebaut, das in Betriebs- oder Speisepausen das Wasser zur Speisewassergrube zurückleitet.Device for preventing the formation of steam in breath gas preheaters. the The invention relates to an automatic device for preventing steam formation in Flue gas preheaters when the boiler feed is interrupted. If not during breaks in operation is fed, there is a temperature increase in the preheater and with a longer duration also steam formation. Both are for the durability of the preheater because of the Onset of fresh feeding, rapid cooling and possible water hammers harmful. To prevent this inconvenience one has already behind the preheater an automatic circulation valve installed, which during breaks in operation or feeding the Returns water to the feedwater pit.

Das Wesen der Erfindung besteht nun darin, daß dieses Umlaufventil von einer belasteten Staudruckscheibe derart beeinflußt wird, daß es bei Strömung in der Verbindungsleitung zwischen Vorwärtner und Kessel das Umlaufventil geschlossen hält, dagegen bei Aufhören der Strömung durch den Druck in der Leitung geöffnet wird. Die Vorrichtung ist in der Zeichnung in senkrechte& Schnitt schematisch dargestellt. Von der Speiseleitung a, zwischen Vorwärmer und Kessel, zweigt eine kleine Leitung mit Ventil b ab. Dieses Ventil wird durch ein Gewicht c und dem auf die Scheibe d bei Speisung in der Pfeilrichtung auftretenden Staudruck geschlossen gehalten. Hört die Speisung auf, so fällt der Staudruck gegen d fort, das Gewicht c genügt allein nicht mehr zum Zuhalten des Ventils b und dieses wird durch den in a herrschenden Druck geöffnet. Das Ventil ist so klein bemessen, daß beim Öffnen kein nennenswerter Druckabfall in a auftritt, aber doch genügend Wasser durch den Vorwärmer zur Speisegrube zurückfließt, um eine größere Temperatursteigerung im Vorwärmer zu vermeiden. Mit neu beginnender Speisung setzt auch der Staudruck gegen d wieder ein und schließt Ventil b wieder zu.The essence of the invention is that this circulation valve is influenced by a loaded back pressure disk in such a way that it keeps the circulation valve closed when there is flow in the connecting line between the forwarder and the boiler, but is opened when the flow stops due to the pressure in the line. The device is shown schematically in the drawing in vertical and section. A small line with valve b branches off from the feed line a, between the preheater and boiler. This valve is kept closed by a weight c and the dynamic pressure that occurs on the disk d when it is fed in the direction of the arrow. If the supply ceases, the dynamic pressure against d ceases, the weight c alone is no longer sufficient to keep valve b closed and this is opened by the pressure prevailing in a. The valve is so small that there is no significant pressure drop in a when it is opened, but enough water flows back through the preheater to the feed pit to avoid a major increase in temperature in the preheater. When the supply starts again, the dynamic pressure against d also sets in again and closes valve b again.

Claims (1)

PATENTANSPRUCH: Vorrichtung zum Verhüten von Dampfbildung in Rauchgasvorwärmern, bestehend aus einem zwischen Vorwärmer und Kessel von der Speiseleitung abgezweigten Umlaufventil, das bei Betriebspausen Wasser durch den Vorwärmer nach der Speisewassergrube zurückleitet, dadurch gekennzeichnet, daß dieses Umlaufventil (b) durch eine belastende Staudruckscheibe (d) derart beeinflußt wird, daß es bei Strömung in der Leitung (a) zwischen Vorwärmer und Kessel geschlossen bleibt, bei Aufhören der Strömung dagegen durch den Druck in der Leitung geöffnet wird. PATENT CLAIM: Device for preventing steam formation in flue gas preheaters, consisting of a circulation valve branched off from the feed line between the preheater and boiler, which returns water through the preheater to the feedwater pit during breaks in operation, characterized in that this circulation valve (b) is through a loading back pressure disc (i.e. ) is influenced in such a way that it remains closed when there is flow in line (a) between the preheater and boiler, but when the flow stops, it is opened by the pressure in the line.
DEH99338D Device to prevent steam formation in flue gas preheaters Expired DE415373C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH99338D DE415373C (en) Device to prevent steam formation in flue gas preheaters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH99338D DE415373C (en) Device to prevent steam formation in flue gas preheaters

Publications (1)

Publication Number Publication Date
DE415373C true DE415373C (en) 1925-06-25

Family

ID=7168293

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH99338D Expired DE415373C (en) Device to prevent steam formation in flue gas preheaters

Country Status (1)

Country Link
DE (1) DE415373C (en)

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