EP2927437A1 - Conduite d'eau de refroidissement dotée de puits vertical et de puits de chute - Google Patents

Conduite d'eau de refroidissement dotée de puits vertical et de puits de chute Download PDF

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Publication number
EP2927437A1
EP2927437A1 EP14163337.0A EP14163337A EP2927437A1 EP 2927437 A1 EP2927437 A1 EP 2927437A1 EP 14163337 A EP14163337 A EP 14163337A EP 2927437 A1 EP2927437 A1 EP 2927437A1
Authority
EP
European Patent Office
Prior art keywords
cooling water
riser
chute
shaft
water 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.)
Withdrawn
Application number
EP14163337.0A
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German (de)
English (en)
Inventor
Uwe Juretzek
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP14163337.0A priority Critical patent/EP2927437A1/fr
Priority to PCT/EP2015/056107 priority patent/WO2015150145A2/fr
Priority to EP15741775.9A priority patent/EP3087258A2/fr
Publication of EP2927437A1 publication Critical patent/EP2927437A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/003—Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits

Definitions

  • the present invention relates to a cooling water pipe for a power plant and a power plant comprising such a cooling water pipe.
  • the cooling water supply in a power plant takes place via a cooling water pipe.
  • suitable pumps are typically provided, via which the flow rate or the flow behavior of the cooling water can be set significantly.
  • the pumps for providing cooling water have an essential task. Namely, such pumps fail due to the damage, the entire power plant must be shut down at least partially within a short time, since the capacitor can not be supplied with sufficient cooling power.
  • redundant pumps with hydraulically operated adjustment flaps in particular flaps (including counterweight), which are designed as combined shut-off / non-return flaps or motor-operated shut-off flaps (eg 2 ⁇ 50%), are used in modern cooling water lines a pump to be able to maintain at least the cooling water supply partially using the other pump.
  • the adjustment flaps are typically located at the exit of the pumps and initially serve to shut off the out of service pump to prevent backflow of the cooling water through the pump.
  • the adjustment flaps are designed to close in case of pump failure controlled to avoid in particular pressure surges. Especially close to the end position of the adjustment flaps this has to be done slowly enough.
  • the still in operation pumps also be operated within a permissible working range. In the case of empty or partially emptied cooling water lines, a controlled filling of the cooling water lines can also be achieved without, however, operating the pump in impermissible working areas, which could result in pressure surges, for example.
  • a disadvantage of these known from the prior art technical adjustment flaps is that these are sometimes prone to failure even as active components and are subject to a risk of failure.
  • the hydraulic or motorized operation of the adjustment flaps can be prevented, for example during a fault in the electrical energy supply and thus have the failure of the pump result.
  • the adjustment flaps are very expensive components, in particular if they are moved hydraulically, the operation of which also requires regular maintenance.
  • a cooling water line for a power plant which is connected to a capacitor, and in which in normal operation upstream of the condenser, a riser shaft with respect to downstream arranged chute is included, and a feed pump, the like is arranged, that in the riser shaft or upstream of the riser shaft in the cooling water line cooling water can be supplied with a flow.
  • a power plant which includes such a previously as well as below described cooling water pipe.
  • the normal operation refers to a normal cooling water operation in which cooling water in the cooling water pipe is conveyed in a predetermined direction from the riser to the chute and to the condenser.
  • a cooling water line for a power plant relates in particular to a cooling water line of a power plant.
  • the arrangement of the feed pump upstream of the riser takes place according to execution in a region in which the cooling water temperature has at most 60 ° C.
  • the feed pump is connected between the riser shaft and a cooling tower.
  • the flow application by means of the feed pump according to the invention is designed such that cooling water is conveyed into the riser and is transferred from there into the chute.
  • the cooling water falls to a lower location, from where the cooling water continues to sink or flow out.
  • the riser is at least partially disposed in the chute.
  • riser and chute may be both be interconnected only by a suitable overflow pipe, so that a spatial integration of the riser in the chute is not essential.
  • a cooling water line for a power plant has a riser shaft and a downwardly arranged chute.
  • the cooling water is moved in the riser shaft against the acceleration of gravity upwards. After reaching the upper limit of the riser, the water is transferred to the chute. From there, the water can be transported further in the cooling water line. The further transport takes place here due to the geodetic pressure conditions in the chute.
  • cooling water in the riser at a height level which is lower than the level of the upper boundary of the riser. Only by operating the feed pump so much water is conveyed into the riser that this flows over after reaching the upper limit in the chute.
  • the overflowing cooling water also raises the height level of the cooling water in the chute to a height level at which the geodesic pressure conditions in the chute are sufficient to carry the cooling water in the chilled water pipe further.
  • the level of this desired cooling water level is reached when the geodetic pressure in the chute sufficient to overcome the pressure losses in the cooling water pipe and the subsequent possibly existing height differences in the cooling water pipe with a sufficient amount of cooling water.
  • the solution according to the invention can completely dispense with the provision of an adjustment flap, as a result of which maintenance-related and safety-related advantages are the result.
  • riser and chutes can be built relatively inexpensively depending on the choice of material. Maintenance of these components of the power plant can be achieved relatively quickly and inexpensively due to their simple geometry.
  • shut-off valves eg the butterfly valves on the condenser
  • the cooling water level in the chute would rise until it overflows, insofar as the height of the chute defines the maximum pressure in the cooling water system and no longer the zero head of the cooling water pump.
  • This has the advantage that in particular cooling water lines, water chamber lid on the condenser, etc. can be designed to a lower pressure and can be manufactured correspondingly cheaper.
  • Furthermore causes the defined height of the overflow from the riser into the chute that the cooling water pump can not run out of the curve, as always a height of the riser shaft corresponding minimum pressure can be maintained.
  • the cooling water pipe and the condenser in power plants where the water distribution in the cooling tower is the highest point in the cooling water system (this is the normal case) always completely filled even at a standstill, since the level in the chute automatically lowers only to the height of the water distribution and stays there. This can be dispensed with vacuum breaker and ventilation lines on the condenser in a cooling tower.
  • the feed pump is designed as a shaft pump, which is arranged in particular in the riser shaft.
  • a shaft pump should be understood in this case in the sense of a submersible pump, which can be arranged completely in the cooling water or is. In this respect, therefore, the drive unit and the pump unit are arranged completely in the cooling water line. If such a shaft pump provided in the riser, this is typically done in the base region of the riser, so where the static pressures are greatest. To remove such a shaft pump, it is sometimes sufficient already, by means of a suitable fastening device from the riser shaft from above about by means of a crane, which is often readily available in power plants, pull out. As a result, the maintenance and repair work on the pump can be made relatively easily without that pipe connections must be dismantled. In this respect, downtimes can be significantly reduced and the availability of suitable cooling water flow in the cooling water line can be improved.
  • no adjustment flap is provided between the pump and the condenser, in particular at the outlet of the feed pump.
  • An embodiment adjustment flap would typically be hydraulically operable (see explanations above) and can also be opened or closed against the pressure of the feed pump. By avoiding the provision of an adjustment flap in the cooling water line thus costs can be saved as well as maintenance and fuse-related risks can be avoided.
  • the execution adjustment flap in the sense of a butterfly valve and / or a non-return valve to be understood.
  • closing flaps which are associated with the capacitor.
  • the riser shaft has at least a minimum height of 8m and in particular has a maximum height of 30m.
  • a riser shaft at least two chutes is assigned such that when promoting cooling water through the riser the subsidized cooling water is divided on the at least two chutes.
  • the two separate cooling water streams in the chutes can be used selectively to supply different condenser halves separately with cooling water.
  • a chute of the cooling water pipe is assigned at least two riser shafts such that when conveying Cooling water through the at least two risers the subsidized cooling water combined in a chute.
  • at least two risers in particular exactly two risers, a higher redundancy factor can be achieved by providing several relatively smaller feed pumps in the risers which carry a comparable amount of cooling water as compared to possibly a larger pump in a single riser.
  • the entire cooling water supply system can continue to be maintained via the cooling water line, since the remaining feed pumps in the other riser shafts continue to convey cooling water into the common chute.
  • the at least one riser and / or chute comprises a tube comprising a glass fiber reinforced plastic or other composite material. Since these composite materials can be relatively easily manufactured and prefabricated, a riser and / or chute can be built in a short construction time. In addition, such pipes can be produced very inexpensively, so that there is an economic advantage.
  • the at least one chute and / or riser comprises a reinforced concrete structure. Even such structures can be made without relatively large construction effort, without causing high costs. Because in the course of building a power plant reinforced concrete structures anyway can be built in many places, the provision of a chute and / or riser shaft from just this material can be provided very economically and without further logistical precautions.
  • the at least one riser has a closable branch, in particular upstream of the feed pump, via which branch cooling water can be removed for the purpose of draining. Since during operation the cooling water is increasingly enriched with salts, it is necessary to replace this.
  • the riser shaft targeted a portion of cooling water can be removed for draining via a corresponding branch, which is elsewhere replaced by fresh cooling water.
  • the branch is, for example, closed by a suitable valve.
  • the at least one chute has a closable feed, via which chemical substances can be added to the cooling water for chemical treatment. Since in the chute sometimes a more turbulent flow prevails than in the downstream cooling water pipe areas, at this point of the chute added chemical substances can be particularly well mixed into the cooling water.
  • the supply may be arranged at a location of the chute, which does not require the supply of chemical substances under elevated pressure. Addition of the chemicals at pressures slightly higher than the ambient pressure is possible.
  • a plurality of riser shafts is provided with each downstream arranged chutes and respectively associated feed pumps, wherein the plurality of chutes opens into a common inlet into the cooling water pipe.
  • the majority of riser shafts also become typical supplied with cooling water through a common connection area according to a further embodiment of the cooling water line. Consequently, even in case of failure of feed pumps in a single riser further cooling water in the associated other chutes are promoted, but due to the common inlet, a merger of the cooling water of the different chutes is done, so that a mixture and supply of these amounts of cooling water via the inlet into the cooling water pipe can be easily achieved.
  • FIG. 1 shows a side sectional view through a first embodiment of the inventive cooling water pipe 1, which may be about from a steam part comprehensive power plant (not shown in the present case) may be included.
  • the cooling water line 1 comprises a riser shaft 10, which is associated with a chute 11, wherein in the base region of the riser shaft 10, a feed pump 12 is arranged.
  • the system of riser shaft 10, chute 11 and feed pump 12 are fluidly connected in the cooling water line such that the cooling water 5 is supplied via a cooling water inlet 3 to the riser 10 initially.
  • When transferring the exiting the riser water into the chute 11 this flows geodetically into the chute 11 via a cooling water drain 4 to the condenser 2 and then continue via a cooling water discharge 13 back to the cooling tower (not shown).
  • the condenser 2 is used in accordance with the provision to supply the steam part of a not further provided with reference numerals power plant with cooling power.
  • the feed pump 12 promotes cooling water 5 such that it is continuous is transferred to the chute 11 at the upper limit of the riser shaft 10. Due to the height conditions or pressure loss ratios in the cooling water pipe 1, a substantially constant level in the chute 11 settles in the course of operation of the cooling water pipe 1. This is sufficient to build up a static pressure in the base region of the chute 11, so that the cooling water located there in the cooling water line 1 can be transported further in the direction of the condenser 2 and to these subsequent systems or system sections.
  • the filling level in the riser 10 drops, so that no further cooling water 5 is transferred into the chute 11.
  • the thereby changing pressure conditions in the riser 10 can cause the feed pump 12 sometimes transmits pressure fluctuations on the cooling water column in the riser. However, these are not transmitted to the water column in the chute, and therefore can not propagate towards the condenser. In this respect, the feed pump 12 is decoupled from the condenser 2.
  • the feed pump can then again transport cooling water 5 into the riser shaft 10 after renewed operation, the fill level in the riser shaft 10 rises again until it reaches the upper limit of the riser shaft 10, after which it is transferred into the chute 11. If, during this starting process, the feed pump 12 again transfers pressure fluctuations to the cooling water column in the riser 10 due to the changing pressure conditions, these pressure changes or pressure surges can also not be transferred to the condenser 2 or only greatly reduced.
  • FIG. 2 shows a further embodiment of the cooling water pipe 1 according to the invention in a schematic sectional view of the side, wherein the embodiment shown differs from the in FIG. 1 shown embodiment differs only in that in the riser 10, a branch 15 is provided, via which cooling water 5 can be removed for the purpose of drainage.
  • the branch 15 may in this case be provided with a valve not shown, which designed the branch 15 closable.
  • FIG. 2 shown embodiment of the cooling water pipe 1, a feed 16, which is also designed to be closed via a valve not shown.
  • chemical substances can be introduced into the cooling water 5 via the supply 16 so that a mixture of both liquids or substances can take place in the region of the chute 11.
  • FIG. 3 shows a further embodiment of the cooling water pipe 1 according to the invention in a lateral sectional view, which differs from the in FIG. 1 shown embodiment differs in that the arrangement of riser 10 to chute 11 has a different geometry.
  • the riser 10 may be designed as a plurality of risers 10.
  • the chute 11 may be configured as a plurality of chutes 11. Such embodiments are described below.
  • FIG. 4 shows a cross-sectional view through an embodiment of the inventive cooling water pipe 1 as in FIG. 3 is shown.
  • the cross section shown in FIG. 4 on the IV-IV designated cutting plane in FIG. 3 As can be clearly seen, the embodiment has only one riser 10, wherein the riser 10 are assigned two juxtaposed separated chutes 11.
  • the cooling water When cooling water emerges in the region of the upper boundary of the riser shaft 10, the cooling water is split between the two gravity wells 11 and can be removed separately.
  • the capacitor 2 not shown can be supplied via two separate streams with cooling water.
  • FIG. 5 shows an embodiment according to FIG. 4 Alternative embodiment of the arrangement of riser 10 and chute 11.
  • two separate risers 10 are provided which share a lateral wall.
  • the overflowing from the riser shafts 10 in the upper region of the boundary cooling water flows into the common chute 11 a. Consequently, the mixed from the two risers 10 in the chute 11 mixed cooling water.
  • FIG. 6 shows a side sectional view of another possible embodiment of the invention, which in addition to two risers 10 (dashed lines) each have a chute 11 associated therewith.
  • the two chutes 11 have a common inlet 20, via which the discharged into the chutes 11 cooling water 5 can be mixed, about about the cooling water discharge 4 (frontal view) to the capacitor 2 (not shown here) to be dissipated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP14163337.0A 2014-04-03 2014-04-03 Conduite d'eau de refroidissement dotée de puits vertical et de puits de chute Withdrawn EP2927437A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14163337.0A EP2927437A1 (fr) 2014-04-03 2014-04-03 Conduite d'eau de refroidissement dotée de puits vertical et de puits de chute
PCT/EP2015/056107 WO2015150145A2 (fr) 2014-04-03 2015-03-23 Conduite d'eau de refroidissement comportant un puits ascendant et un puits de chute
EP15741775.9A EP3087258A2 (fr) 2014-04-03 2015-03-23 Conduite d'eau de refroidissement comportant un puits ascendant et un puits de chute

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14163337.0A EP2927437A1 (fr) 2014-04-03 2014-04-03 Conduite d'eau de refroidissement dotée de puits vertical et de puits de chute

Publications (1)

Publication Number Publication Date
EP2927437A1 true EP2927437A1 (fr) 2015-10-07

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EP14163337.0A Withdrawn EP2927437A1 (fr) 2014-04-03 2014-04-03 Conduite d'eau de refroidissement dotée de puits vertical et de puits de chute
EP15741775.9A Withdrawn EP3087258A2 (fr) 2014-04-03 2015-03-23 Conduite d'eau de refroidissement comportant un puits ascendant et un puits de chute

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Application Number Title Priority Date Filing Date
EP15741775.9A Withdrawn EP3087258A2 (fr) 2014-04-03 2015-03-23 Conduite d'eau de refroidissement comportant un puits ascendant et un puits de chute

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EP (2) EP2927437A1 (fr)
WO (1) WO2015150145A2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2938631B1 (de) * 1979-09-06 1980-06-26 Sulzer Ag Dampfkraftanlage mit luftgekuehltem Dampfkondensator
AU562067B2 (en) * 1975-06-16 1987-05-28 Hudson Products Corp. Condensing steam with the aid of a wet and a dry cooling tower
DE19534951A1 (de) * 1995-09-20 1997-03-27 Siemens Ag Kühlkreislauf
EP2447479A1 (fr) * 2010-10-26 2012-05-02 Siemens Aktiengesellschaft Procédés de refroidissement d'un fluide transporteur d'une centrale électrique, centrales électriques et système de refroidissement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU562067B2 (en) * 1975-06-16 1987-05-28 Hudson Products Corp. Condensing steam with the aid of a wet and a dry cooling tower
DE2938631B1 (de) * 1979-09-06 1980-06-26 Sulzer Ag Dampfkraftanlage mit luftgekuehltem Dampfkondensator
DE19534951A1 (de) * 1995-09-20 1997-03-27 Siemens Ag Kühlkreislauf
EP2447479A1 (fr) * 2010-10-26 2012-05-02 Siemens Aktiengesellschaft Procédés de refroidissement d'un fluide transporteur d'une centrale électrique, centrales électriques et système de refroidissement

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Publication number Publication date
WO2015150145A3 (fr) 2015-12-17
EP3087258A2 (fr) 2016-11-02
WO2015150145A2 (fr) 2015-10-08

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