Heat exchange – Line connected conduit assemblies
Reexamination Certificate
1998-06-11
2001-08-21
Flanigan, Allen (Department: 3743)
Heat exchange
Line connected conduit assemblies
C165S145000
Reexamination Certificate
active
06276446
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a recooling system for cooling water from a condenser of a steam power plant.
A steam power plant is normally used to generate electric energy or even to drive a machine. In that case, a working medium, normally a water/steam mixture, carried in an evaporator circuit of the steam power plant is evaporated in an evaporator. The steam generated in the process expands to perform work in the steam turbine of the steam power plant and is then fed to the condenser thereof. The working medium condensed in the condenser is then fed to the evaporator again through a feedwater pump.
The working medium in the condenser is normally condensed by heat exchange with cooling water which is fed to the condenser and heats up in the process. The heated cooling water is in turn normally cooled in a recooling system by heat exchange with the ambient air. The cooled cooling water is then available again for cooling the condensate.
The recooling system normally includes a number of cooling towers. Allocated to each cooling tower is a catch basin which is connected to a collecting passage and in which cooled cooling water is collected. The recooled cooling water is fed back from there into the condenser through a condenser pump. Such a recooling system as a rule is adapted to the conditions of the power station site and therefore requires considerable outlay in terms of construction and layout. In addition, a complicated individual level control for the water level of each catch basin is required for such a recooling system.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a recooling system for cooling water from a condenser of a steam power plant, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known systems of this general type and which can be installed and operated in an especially simple manner.
With the foregoing and other objects in view there is provided, in accordance with the invention, a recooling system for cooling water from a condenser of a steam power plant, comprising a number of cooling modules; water-feed ducts each associated with a respective one of the cooling modules for feeding the cooling modules, the water-feed ducts connected to one another like communicating tubes; and a common main cooling-water line for connecting the water-feed shafts to a condenser of a steam power plant.
The invention starts out from the concept that the installation cost for the recooling system is reduced by standardized components. When standardized components or modules are used for the recooling system, it can be adapted like a unit construction system to the respective power station plant.
In addition, the recooling system can be especially simple to operate if an individual level control for each water-collecting basin that is allocated in each case to a cooling module is replaced by a level control which is common to all of the water-collecting basins. A level control that is common to all of the water-collecting basins can be achieved by a central water supply which is constructed for all of the cooling modules in such a way that a variation in the cooling-water inflow to a cooling module leaves the cooling-water inflow to the other cooling modules more or less unchanged. Such a structure can be achieved by the water-feed ducts being connected to one another according to the principle of communicating tubes. The term “communicating tubes” is defined, for example, in the book entitled “Duden: Das gro&bgr;be Wö rterbuch der Deutschen Sprache” [Duden: The Large Dictionary of the German Language], volume 5 (1980), Bibliographisches Institut Mannheim.
Thus, according to the principle of communicating tubes, the level of a liquid in tubes that are connected to one another and open at the top is the same in each tube. The water-feed ducts of all of the cooling modules therefore have the same water level so that the inflow of cooling water to all of the cooling modules can be centrally controlled. An especially simple and reliable water-level control, namely with the aid of the operating conditions prevailing in the condenser as well as through the use of the delivery capacity of the cooling-water pump, can be achieved in this case by the water-feed ducts connected to one another being connected to the condenser through a common main cooling-water line.
In accordance with another feature of the invention, in order to uncouple the cooling-water inflow to a cooling module from the cooling-water inflow to the other cooling modules in an especially simple manner, a water overflow is connected to the water supply, and the water overflow is connected on the outlet side to a water return. Therefore, a constant water level is maintained in each water-feed duct in an especially simple manner even when the pressure conditions in the water supply vary. The operating conditions for each cooling module are therefore at least more or less independent of the cooling-water conditions in the condenser and of the operating state of the condenser pump.
In accordance with a concomitant feature of the invention, each water-feed duct can be shut off through the use of an intake fitting allocated thereto. The water intake to each cooling module can therefore be controlled with especially simple measures. During maintenance or repair work on a cooling module, its water intake can be interrupted in a simple manner, with the water overflow serving as a bypass for the cooling-water flow that is then in excess. Thus the water intake into the other cooling modules is unchanged even when a cooling module is shut off. Therefore, a complicated level control in the collecting basins of the cooling modules is not necessary even when one or more cooling modules are shut off.
The advantages achieved by the invention are in particular the fact that, on one hand, the recooling system, due to its modular structure, can be adapted like a unit construction system to a predetermined power station concept in an especially flexible manner, in which case standard components may be used. On the other hand, the recooling system is also especially flexible during operation due to the structure of the water-feed shafts, which are connected to the condenser of the steam power plant like communicating tubes through a common main cooling-water line.
During varying operating conditions, for example when switching over from summer to winter operation, varying demands are made on the recooling system. In that case, the total flow of the cooling water to be cooled can be split up into a first partial flow which is cooled in cooling modules and a second partial flow which is fed back directly into the water return through the water overflow, like a bypass, without cooling. In the process, the operation of each cooling module and of the entire recooling system can be maintained even during the use of unregulated cooling-water pumps within the tolerances predetermined for this recooling system without a complicated level control.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a recooling system, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 803220 (1905-10-01), Farnsworth
patent: 974598 (1910-11-01), Reimers
patent: 1103386 (1914-07-01), Vail
patent: 4168030 (1979-09-01), Timmerman
patent: 4476070 (1984-10-01), Blanquet
patent: 2356505 A1 (1975-05-01), None
patent: 26 05 527 (1977-08-01), None
Kratz Gerhard
Lehmann Rudolf
Münch Siegfried
Flanigan Allen
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Stemer Werner H.
LandOfFree
Recooling system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recooling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recooling system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2517757