WO1997009565A2 - Process and system for starting a continuous steam generator - Google Patents
Process and system for starting a continuous steam generator Download PDFInfo
- Publication number
- WO1997009565A2 WO1997009565A2 PCT/DE1996/001666 DE9601666W WO9709565A2 WO 1997009565 A2 WO1997009565 A2 WO 1997009565A2 DE 9601666 W DE9601666 W DE 9601666W WO 9709565 A2 WO9709565 A2 WO 9709565A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- evaporator
- evaporator tubes
- steam generator
- line
- Prior art date
Links
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.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96937994A EP0812407B1 (en) | 1995-09-08 | 1996-09-05 | Process and system for starting a continuous steam generator |
DE59605404T DE59605404D1 (en) | 1995-09-08 | 1996-09-05 | METHOD AND SYSTEM FOR STARTING A CONTINUOUS STEAM GENERATOR |
JP51077497A JP2001507436A (en) | 1995-09-08 | 1996-09-05 | Method and system for operating a once-through steam generator |
DK96937994T DK0812407T3 (en) | 1995-09-08 | 1996-09-05 | Method and system for starting a flow-through steam generator |
AT96937994T ATE193765T1 (en) | 1995-09-08 | 1996-09-05 | METHOD AND SYSTEM FOR STARTING UP A CONTINUOUS STEAM GENERATOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19533351.9 | 1995-09-08 | ||
DE19533351 | 1995-09-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997009565A2 true WO1997009565A2 (en) | 1997-03-13 |
WO1997009565A3 WO1997009565A3 (en) | 1997-04-03 |
Family
ID=7771691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001666 WO1997009565A2 (en) | 1995-09-08 | 1996-09-05 | Process and system for starting a continuous steam generator |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0812407B1 (en) |
JP (1) | JP2001507436A (en) |
CN (1) | CN1164889A (en) |
AT (1) | ATE193765T1 (en) |
DE (1) | DE59605404D1 (en) |
DK (1) | DK0812407T3 (en) |
ES (1) | ES2148810T3 (en) |
WO (1) | WO1997009565A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19800017A1 (en) * | 1998-01-04 | 1999-07-08 | Reinhard Prof Dr Tech Leithner | Operating method for forced flow steam generator |
WO2018177738A1 (en) * | 2017-03-30 | 2018-10-04 | Siemens Aktiengesellschaft | Water feedback in vertical forced-flow steam generators |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111802919B (en) * | 2019-04-12 | 2022-07-15 | 华帝股份有限公司 | Steam generator residual water discharge control method, steam generator and steam cooking equipment |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE944856C (en) * | 1951-10-24 | 1956-06-28 | Siemens Ag | Procedure for the low-load operation of a once-through boiler |
GB1003618A (en) * | 1962-10-30 | 1965-09-08 | Mitsubishi Shipbuilding & Eng | Improvements in or relating to steam generators |
GB1073276A (en) * | 1964-02-28 | 1967-06-21 | Siemens Ag | A forced-flow once-through boiler installation |
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 |
DE2735463A1 (en) * | 1977-08-05 | 1979-02-08 | Kraftwerk Union Ag | ARRANGEMENT FOR SEPARATING WATER AND STEAM IN A CONTINUOUS STEAM GENERATOR |
-
1996
- 1996-09-05 DK DK96937994T patent/DK0812407T3/en active
- 1996-09-05 EP EP96937994A patent/EP0812407B1/en not_active Expired - Lifetime
- 1996-09-05 CN CN96191032A patent/CN1164889A/en active Pending
- 1996-09-05 WO PCT/DE1996/001666 patent/WO1997009565A2/en active IP Right Grant
- 1996-09-05 AT AT96937994T patent/ATE193765T1/en not_active IP Right Cessation
- 1996-09-05 ES ES96937994T patent/ES2148810T3/en not_active Expired - Lifetime
- 1996-09-05 JP JP51077497A patent/JP2001507436A/en active Pending
- 1996-09-05 DE DE59605404T patent/DE59605404D1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE944856C (en) * | 1951-10-24 | 1956-06-28 | Siemens Ag | Procedure for the low-load operation of a once-through boiler |
GB1003618A (en) * | 1962-10-30 | 1965-09-08 | Mitsubishi Shipbuilding & Eng | Improvements in or relating to steam generators |
GB1073276A (en) * | 1964-02-28 | 1967-06-21 | Siemens Ag | A forced-flow once-through boiler installation |
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 |
DE2735463A1 (en) * | 1977-08-05 | 1979-02-08 | Kraftwerk Union Ag | ARRANGEMENT FOR SEPARATING WATER AND STEAM IN A CONTINUOUS STEAM GENERATOR |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19800017A1 (en) * | 1998-01-04 | 1999-07-08 | Reinhard Prof Dr Tech Leithner | Operating method for forced flow steam generator |
DE19800017C2 (en) * | 1998-01-04 | 2001-04-26 | Reinhard Leithner | Method for operating a once-through steam generator |
WO2018177738A1 (en) * | 2017-03-30 | 2018-10-04 | Siemens Aktiengesellschaft | Water feedback in vertical forced-flow steam generators |
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 |
---|---|
CN1164889A (en) | 1997-11-12 |
EP0812407B1 (en) | 2000-06-07 |
ATE193765T1 (en) | 2000-06-15 |
EP0812407A1 (en) | 1997-12-17 |
ES2148810T3 (en) | 2000-10-16 |
WO1997009565A3 (en) | 1997-04-03 |
JP2001507436A (en) | 2001-06-05 |
DK0812407T3 (en) | 2000-10-23 |
DE59605404D1 (en) | 2000-07-13 |
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