EP0812407A1 - Verfahren und system zum anfahren eines durchlaufdampferzeugers - Google Patents
Verfahren und system zum anfahren eines durchlaufdampferzeugersInfo
- Publication number
- EP0812407A1 EP0812407A1 EP96937994A EP96937994A EP0812407A1 EP 0812407 A1 EP0812407 A1 EP 0812407A1 EP 96937994 A EP96937994 A EP 96937994A EP 96937994 A EP96937994 A EP 96937994A EP 0812407 A1 EP0812407 A1 EP 0812407A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- evaporator
- evaporator tubes
- steam generator
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000000926 separation method Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- GJAARPKBDFKHFS-UHFFFAOYSA-N Gerin Natural products COC(=O)C(=C)C1CC2C(=C)C(=O)C=CC2(C)CC1OC(=O)C GJAARPKBDFKHFS-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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 up a once-through steam generator, the evaporator tubes of which the feed water side is flowed through from bottom to top. It further relates to a start-up system for carrying out the method.
- the amount of the flow medium to be conveyed by a feed pump is preferably kept constant for starting and in a load range below a certain limit load.
- the flow rate of the feed pump is equal to the evaporator throughput.
- the invention is therefore based on the object of specifying a method for starting a once-through steam generator, in which on the one hand the start-up losses are as low as possible and in which on the other hand enough water is supplied to the evaporator for reliable cooling of the evaporator tubes.
- this object is achieved according to the invention in that water emerging or ejected from the evaporator tubes on the outlet side is at least partially fed back to the evaporator tubes on the inlet side.
- At least part of the water expelled from the evaporator tubes is expediently first collected.
- the steam contained in the expelled water / water-steam mixture can then advantageously be separated off and overheated.
- the stated object is achieved according to the invention by providing a drain line which connects an outlet collector common to the evaporator tubes to an inlet manifold common to the evaporator tubes.
- a water-steam separation container and / or a collecting container can be connected in the discharge line.
- a check valve which is expediently connected to the drain line prevents backflow from the evaporator inlet to the evaporator outlet.
- the drain line can either be connected directly to the inlet header or to a connecting line which is connected between the inlet header and a preheater (economizer) arranged in the continuous steam generator.
- a preheater economizer
- the advantages achieved by the invention are, in particular, that by returning the water expelled from the evaporator during start-up via a drain line to the evaporator inlet, a self-regulating circulating flow is achieved and reliable cooling of the evaporator tubes is ensured .
- FIG. 1 An exemplary embodiment of the invention is explained in more detail with reference to a drawing.
- FIG. 1 schematically shows a once-through steam generator with a 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 formed by a peripheral wall 2 which merges into a funnel-shaped base 3 at the lower end of the gas cable.
- the evaporator tubes 4 of the peripheral wall 2 are gas-tightly connected to one another on their long sides, e.g. welded.
- the bottom 3 comprises a discharge opening 3a for ashes, not shown.
- the input occurs collector 8 and the outlet header 10 are au ⁇ ßerraum of the gas flue and 'are, for example each formed by a ringför ⁇ Miges tube.
- the inlet header 8 is connected via a line 12 and a header 14 to the outlet of a high-pressure preheater or economizer 16.
- the heating surface of the economizer 16 is arranged in a space above the combustion chamber 6 and enclosed by the surrounding wall 2.
- 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, which is connected to the pressure side of a feed water pump 24.
- the suction side of the feed water pump 24 is connected in a manner not shown in detail to a steam turbine via a condenser and is therefore connected to its water-steam circuit.
- the outlet header 10 is connected via a line 26 to a water-steam separating vessel or separator 28. This, in turn, is connected on the steam side via a line 30 to an inlet header 32 of a high-pressure superheater 34, which is arranged within the peripheral wall 2 between the economizer 16 and the combustion chamber 6.
- the high-pressure superheater 34 is connected on the output side to a high-pressure part of the steam turbine via a collector 36.
- an intermediate superheater 38 is provided within the space enclosed by the surrounding wall 2 and is connected via collectors 40, 42 between the high-pressure part and a medium-pressure part of the steam turbine.
- the economizer 16 the high-pressure superheater.
- the line 26 is part of a drain line 44 which connects the outlet header 10 to the inlet header 8.
- a collector in the form of a bottle 46 is connected to the discharge line 44 and is connected to the separator 28 on the water side.
- a non-return valve 48 is connected in the discharge line 44.
- feed water S is conveyed via the feed water pump 24 through the heat exchanger 22 and is initially preheated there.
- the amount of feed water S fed to the evaporator tubes 4 per time unit, ie the feed water flow, can be set as a function of the amount of fuel B (fuel flow) fed to the burners 5 per time unit.
- the feed water S preheated in this way is preheated further in the economizer 16 and fed via line 12 to the inlet manifold 8 of the evaporator 4. From there, the heated feed water S flows through the obliquely, but preferably vertically arranged, evaporator tube 4 from bottom to top.
- a water level di is established in the drain line 44 ' . a, which is higher than a water level d2 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 outlet line 44 from the outlet header 10 or from the bottle 46 to the evaporator 4.
- This pressure difference causes the Separator 28 separated water and fed into the bottle 46 provided for need back to the evaporator inlet, ie to the inlet header 8 of the evaporator 4.
- the water stream emerging from the economizer 16 is fed to the evaporator inlet, ie to the inlet header 8.
- the direct connection of the outlet manifold 10 via the outlet line 44 to the inlet manifold 8 of the evaporator 4 ensures a self-adjusting or regulating circulating stream.
- the start-up losses due to partial or complete return of the excess water directly to the evaporator inlet 8 are thus kept particularly simple in a simple manner without a complex circulation pump.
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
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 true EP0812407A1 (de) | 1997-12-17 |
EP0812407B1 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 |
---|---|---|---|---|
US11692703B2 (en) | 2017-03-30 | 2023-07-04 | Siemens Energy Global GmbH & Co. KG | Water feedback in vertical forced-flow steam generators |
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 EP EP96937994A patent/EP0812407B1/de not_active Expired - Lifetime
- 1996-09-05 DK DK96937994T patent/DK0812407T3/da active
- 1996-09-05 ES ES96937994T patent/ES2148810T3/es not_active Expired - Lifetime
- 1996-09-05 DE DE59605404T patent/DE59605404D1/de not_active Expired - Fee Related
- 1996-09-05 CN CN96191032A patent/CN1164889A/zh active Pending
- 1996-09-05 AT AT96937994T patent/ATE193765T1/de not_active IP Right Cessation
- 1996-09-05 JP JP51077497A patent/JP2001507436A/ja active Pending
- 1996-09-05 WO PCT/DE1996/001666 patent/WO1997009565A2/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9709565A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11692703B2 (en) | 2017-03-30 | 2023-07-04 | Siemens Energy Global GmbH & Co. KG | Water feedback in vertical forced-flow steam generators |
Also Published As
Publication number | Publication date |
---|---|
JP2001507436A (ja) | 2001-06-05 |
ATE193765T1 (de) | 2000-06-15 |
EP0812407B1 (de) | 2000-06-07 |
CN1164889A (zh) | 1997-11-12 |
DK0812407T3 (da) | 2000-10-23 |
WO1997009565A3 (de) | 1997-04-03 |
DE59605404D1 (de) | 2000-07-13 |
ES2148810T3 (es) | 2000-10-16 |
WO1997009565A2 (de) | 1997-03-13 |
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