EP0812407B1 - Verfahren und system zum anfahren eines durchlaufdampferzeugers - Google Patents
Verfahren und system zum anfahren eines durchlaufdampferzeugers Download PDFInfo
- Publication number
- EP0812407B1 EP0812407B1 EP96937994A EP96937994A EP0812407B1 EP 0812407 B1 EP0812407 B1 EP 0812407B1 EP 96937994 A EP96937994 A EP 96937994A EP 96937994 A EP96937994 A EP 96937994A EP 0812407 B1 EP0812407 B1 EP 0812407B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- evaporator
- evaporator tubes
- water
- steam generator
- inlet
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000000926 separation method Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B29/00—Steam boilers of forced-flow type
- F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
- F22B29/12—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers
Definitions
- the invention relates to a method for starting a Continuous steam generator with the features of the preamble of Claim 1 and a start-up system with the features of The preamble of claim 2.
- the heating leads from the gastight surrounding wall of a tube forming tubes of an evaporator to a complete evaporation of the Flow medium in the evaporator tubes in one pass.
- a circulation current is superimposed. This is supposed to go through correspondingly high speeds in the pipes ensure this be cooled.
- US-A-3 356 074 and GB-A-1 003 618 are forced steam generators with such a superimposed one Circulation known. This circulation flow is in one with a Check valve provided circulation line with the help of a Maintain circulation pump.
- US-A-3 504 655 is a forced flow steam generator described in which in the start-up phase in the evaporator Natural circulation is generated.
- the evaporator consists of two Evaporator tube groups that are flowed through in succession.
- the Inlet collectors of the first evaporator tube group are over one Downpipe connected to a water-steam separator in which one connected to the output of an economizer Feed water pipe opens.
- the exit collectors of the Evaporator tube groups are connected to the Water-steam separator connected. Furthermore, is about each a lockable line for the outlet collectors of the first Evaporator tube group with the inlet header of the second Evaporator tube group and the outlet header of the second Evaporator tube group connected to the secondary heating surfaces.
- the outlet manifold via the water-steam separation vessel and the downpipe with the inlet collector according to Art be connected by communicating tube, so that in the Start-up phase of the mentioned natural circulation due to the Difference in pressure between the pressure head in the downpipe and the geodetic pressure drop in the evaporator tubes.
- the disadvantage of the known forced-flow steam generator is that that a number of shut-off valves must be provided to the steam generator from natural circulation in the start-up phase and at Switch low load to forced through and vice versa.
- the invention is therefore based on the object of a method to start up a once-through steam generator and a little specify complex start-up system in which on the one hand the Start-up losses are as low as possible and on the other hand enough water for the evaporator to safely cool the Evaporator tubes is supplied.
- FIG. 1 An embodiment of the invention is based on a Drawing explained in more detail.
- the figure shows schematically a continuous steam generator with vertical throttle cable and with a drain line of a start-up system.
- the vertical throttle cable of the once-through steam generator 1 is through a Boundary wall 2 formed in at the lower end of the throttle cable a funnel-shaped bottom 3 merges.
- the evaporator tubes 4 the surrounding wall 2 are gas-tight on its long sides connected to each other, e.g. B. welded.
- the bottom 3 includes a discharge opening 3a, not shown, for ashes.
- the lower area of the surrounding wall 2 forms the one with a number of burners 5 provided combustion chamber 6 of Continuous steam generator 1. The burners 5 is during the Operating a fuel line 7 via a fuel line 7 fed.
- the medium side, d. H. of feed water or one Water / water-steam mixture, parallel from bottom to top - or in the case of evaporator tube groups in succession - flowed through Evaporator tubes 4 of the surrounding wall 2 are with their Entry ends to an entry collector 8 and with their Outlet ends connected to an outlet header 10.
- the Entry collector 8 and exit collector 10 are located outside the throttle cable and are e.g. B, each by a annular tube formed.
- the inlet header 8 is via a line 12 and one Collector 14 with the output of one in the once-through steam generator arranged high-pressure preheater or economizers 16 connected.
- the heating surface of the economizer 16 is in one lying above the combustion chamber 6 and from the surrounding wall 2 enclosed space arranged.
- the economizer 16 is on the input side via a collector 18 and a Feed water line 20 with a steam-heated one Heat exchanger 22 connected to the pressure side of a Feed water pump 24 is connected.
- the suction side of the Feed water pump 24 is in a manner not shown and Way connected via a condenser to a steam turbine and thus switched into their water-steam cycle.
- the outlet header 10 is connected to a via a line 26 Water-steam separation vessel or separator 28 connected. This in turn is on the steam side via a line 30 with an inlet header 32 of a high-pressure superheater 34, the inside the surrounding wall 2 between the economizer 16 and the combustion chamber 6 is arranged.
- the high pressure superheater 34 is on the output side via a Collector 36 connected to a high pressure part of the steam turbine. Between the high pressure superheater 34 and the economizer 16 is enclosed within by the surrounding wall 2 Space provided an intermediate superheater 38, the over Collector 40, 42 between the high pressure part and a medium pressure part the steam turbine is switched.
- the Economizer 16, the high pressure superheater 34 and the reheater 38 are in the so-called convection or bulkhead heating surfaces Convection train of the once-through steam generator 1.
- the line 26 is part of a drain line 44, which is the outlet header 10 connects to the entry collector 8.
- a drain line 44 is connected to a collector in the form of a bottle 46, connected to the separator 28 on the water side is.
- a check valve 48 switched.
- the preheated feed water S is in the economizer 16 further preheated and via line 12 to the inlet header 8 of the evaporator 4 supplied. Flowing through from there the heated feed water S the oblique, preferably however vertically arranged evaporator tubes 4 from bottom to top.
- a water level d 1 is set in the discharge line 44, which is higher than a water level d 2 determined by the weight of the water and the water-steam mixture in the evaporator tubes 4.
- the geodetic pressure drop in the evaporator tubes 4 is lower than the pressure level in the discharge line 44 from the outlet header 10 or from the bottle 46 to the evaporator 4.
- This pressure difference causes the bottle 46 separated in the separator 28 to flow into the bottle 46 as required led water back to the evaporator inlet, ie to the inlet manifold 8 of the evaporator 4.
- the water stream emerging from the economizer 16 is fed to the evaporator inlet, ie to the inlet manifold 8.
- the pressure drop across the evaporator 4 becomes greater than the pressure level from the bottle 46 to the inlet manifold 8 of the evaporator 4. In this case, the water would flow in the opposite direction from the inlet header 8 into the bottle 46. This is prevented by the check valve 48.
- the direct connection of the outlet collector 10 via the drain line 44 with the inlet header 8 of the evaporator 4 ensures a self-adjusting or regulating Circulating current.
- the start-up losses are thus partially or completely recycle the excess water directly to the evaporator inlet 8 without a complex circulation pump kept simple and particularly low.
Landscapes
- 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)
- Control Of Turbines (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Description
Claims (2)
- Verfahren zum Anfahren eines Zwangsdurchlaufdampferzeugers mit Verdampferrohren, die speisewasserseitig parallel und von unten nach oben durchströmt sind, wobei das aus den Verdampferrohren ausgangsseitig ausgestoßene Wasser den Verdampferrohren eingangsseitig über eine an die Verdampferrohre angeschlossene Ablaufleitung als ein sich selbst regelnder Naturumlaufstrom wieder zugeführt wird, der durch den Druckunterschied zwischen der Druckhöhe in der Ablaufleitung und dem geodätischen Druckabfall in den Verdampferrohren aufrechterhalten wird, dadurch gekennzeichnet, daß das Speisewasser nach dem Austritt aus einem Economizer den Verdampferrohren am unteren Ende über eine Verbindungsleitung zugeführt wird und daß in der Ablaufleitung durch eine Rückschlagklappe ein Rückströmen vom Verdampfereingang zum Verdampferausgang verhindert wird.
- Anfahrsystem für einen Zwangsdurchlaufdampferzeuger (1) mit einer Anzahl von von unten nach oben parallel durchströmten Verdampferrohren (4) und einem in dem Zwangsdurchlaufdampferzeuger (1) angeordneten Economizer (16), wobei eine Ablaufleitung (44) vorgesehen ist, in der ein Wasser-Dampf-Trennbehälter (28) angeordnet ist, die einen den Verdampferrohren (4) gemeinsamen Austrittssammler (10) mit einem den Verdampferrohren (4) gemeinsamen Eintrittssammler (8) nach der Art der kommunizierenden Röhren verbindet, wodurch ein Naturumlaufstrom durch den Druckunterschied zwischen der Druckhöhe in der Ablaufleitung (44) und dem geodätischen Druckabfall in den Verdampferrohren (4) aufrechterhalten wird, dadurch gekennzeichnet, daß in der Ablaufleitung (44) eine Rückschlagklappe (48) angeordnet ist und daß eine Speisewasser führende Verbindungsleitung (12) nach dem Austritt aus dem Economizer (16) mit dem Eintrittssammler (8) der Verdampferrohre (4) verbunden ist.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19533351 | 1995-09-08 | ||
| DE19533351 | 1995-09-08 | ||
| PCT/DE1996/001666 WO1997009565A2 (de) | 1995-09-08 | 1996-09-05 | Verfahren und system zum anfahren eines durchlaufdampferzeugers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0812407A1 EP0812407A1 (de) | 1997-12-17 |
| EP0812407B1 true EP0812407B1 (de) | 2000-06-07 |
Family
ID=7771691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96937994A Expired - Lifetime EP0812407B1 (de) | 1995-09-08 | 1996-09-05 | Verfahren und system zum anfahren eines durchlaufdampferzeugers |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0812407B1 (de) |
| JP (1) | JP2001507436A (de) |
| CN (1) | CN1164889A (de) |
| AT (1) | ATE193765T1 (de) |
| DE (1) | DE59605404D1 (de) |
| DK (1) | DK0812407T3 (de) |
| ES (1) | ES2148810T3 (de) |
| WO (1) | WO1997009565A2 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017205382A1 (de) * | 2017-03-30 | 2018-10-04 | Siemens Aktiengesellschaft | Wasserrückführung in vertikalen Zwangdurchlaufdampferzeugern |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19800017C2 (de) * | 1998-01-04 | 2001-04-26 | Reinhard Leithner | Verfahren zum Betreiben eines Zwangdurchlaufdampferzeugers |
| CN111802919B (zh) * | 2019-04-12 | 2022-07-15 | 华帝股份有限公司 | 蒸汽发生器余水排出控制方法、蒸汽发生器及蒸汽烹饪设备 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE944856C (de) * | 1951-10-24 | 1956-06-28 | Siemens Ag | Verfahren zum Kleinstlastbetrieb eines Zwangdurchlaufkessels |
| CH416676A (de) * | 1962-10-30 | 1966-07-15 | Mitsubishi Shipbuilding & Eng | Vorrichtung zur zwangsweisen Rückförderung von Wasser durch einen Zwangdurchlaufkessel |
| AT258316B (de) * | 1964-02-28 | 1967-11-27 | Siemens Ag | Zwangdurchlaufkessel |
| US3356074A (en) * | 1965-07-12 | 1967-12-05 | Combustion Eng | Vapor generating organziation and method |
| US3504655A (en) * | 1967-10-11 | 1970-04-07 | Foster Wheeler Corp | Natural circulation start-up system for once-through steam generator |
| US3580223A (en) * | 1969-04-24 | 1971-05-25 | Steinmueller Gmbh L & C | Method and apparatus for operation of a positively driven steam generator with rolled overlap and gastight welded vaporizer walls |
| DE2735463C2 (de) * | 1977-08-05 | 1982-03-04 | Kraftwerk Union AG, 4330 Mülheim | Durchlaufdampferzeuger |
-
1996
- 1996-09-05 ES ES96937994T patent/ES2148810T3/es not_active Expired - Lifetime
- 1996-09-05 JP JP51077497A patent/JP2001507436A/ja active Pending
- 1996-09-05 WO PCT/DE1996/001666 patent/WO1997009565A2/de not_active Ceased
- 1996-09-05 DK DK96937994T patent/DK0812407T3/da active
- 1996-09-05 EP EP96937994A patent/EP0812407B1/de not_active Expired - Lifetime
- 1996-09-05 AT AT96937994T patent/ATE193765T1/de not_active IP Right Cessation
- 1996-09-05 CN CN96191032A patent/CN1164889A/zh active Pending
- 1996-09-05 DE DE59605404T patent/DE59605404D1/de not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017205382A1 (de) * | 2017-03-30 | 2018-10-04 | Siemens Aktiengesellschaft | Wasserrückführung in vertikalen Zwangdurchlaufdampferzeugern |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997009565A2 (de) | 1997-03-13 |
| ES2148810T3 (es) | 2000-10-16 |
| ATE193765T1 (de) | 2000-06-15 |
| EP0812407A1 (de) | 1997-12-17 |
| DK0812407T3 (da) | 2000-10-23 |
| WO1997009565A3 (de) | 1997-04-03 |
| JP2001507436A (ja) | 2001-06-05 |
| DE59605404D1 (de) | 2000-07-13 |
| CN1164889A (zh) | 1997-11-12 |
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