CN210892855U - Annular steam exhaust main pipe structure in tower of natural ventilation type direct air cooling system - Google Patents
Annular steam exhaust main pipe structure in tower of natural ventilation type direct air cooling system Download PDFInfo
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- CN210892855U CN210892855U CN201921886657.7U CN201921886657U CN210892855U CN 210892855 U CN210892855 U CN 210892855U CN 201921886657 U CN201921886657 U CN 201921886657U CN 210892855 U CN210892855 U CN 210892855U
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Abstract
The application provides an annular steam exhaust main pipe structure in a tower of a natural ventilation type direct air cooling system, wherein a plurality of sections of modularized straight pipe sections are connected into an annular pipe in a dog-ear mode, so that batch blanking, manufacturing and processing are facilitated, the processing technology of the annular pipe is simplified, and the construction and installation efficiency is improved; the steam exhaust main pipe structure is gradually reduced along the steam exhaust direction along with the flow change, and an upper eccentric top flat type reducing pipe or a concentric reducing pipe type is adopted, so that the drainage in the pipe can be converged to the bottom of the pipe in a self-flowing mode, the arrangement of drainage points is greatly reduced, the consumption of drainage materials is saved, and the problems of numerous drainage points, difficult discharge and collection and the like are effectively solved; the tail end of the steam exhaust main pipe structure is provided with the Pi-shaped sealing device, so that the problem of pipeline thermal compensation can be effectively solved, and the space in the tower can be fully utilized to facilitate the entry and exit of other pipelines or equipment.
Description
Technical Field
The utility model relates to an industry cooling field, concretely relates to female tubular construction of annular steam extraction in tower of direct air cooling system of natural draft formula.
Background
In the process of power generation, the exhaust steam discharged by the steam turbine needs to be condensed into water and then is sent back to the boiler for recycling. In order to save water resources, many power plants employ direct air cooling systems to condense the exhaust steam. The traditional direct air cooling system mainly comprises an air cooling condenser, an axial flow fan, a steam exhaust pipeline, a supporting platform and the like. Because the cold air is subjected to heat exchange through the air-cooled condenser in a forced ventilation mode, a system needs to be provided with a plurality of large-diameter axial flow fans, and each fan needs a matched speed reducer and a matched motor; and the exhaust steam of the steam turbine is guided to an overhead supporting platform air-cooled condenser arranged outside the steam turbine room by a steam exhaust pipeline for cooling.
The existing direct air cooling system has the defects that:
1) forced ventilation is adopted, a large amount of electric energy is consumed in the operation, and the power consumption of a plant is increased;
2) the low-frequency noise generated when the large axial flow fan operates causes damage to human health and also brings the problem of environmental protection;
3) the large axial flow fan is arranged on the elevated supporting platform, and the vibration generated during operation brings hidden danger to the safe operation of equipment;
4) the running performance is greatly influenced by environmental meteorological conditions, particularly environmental natural wind.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming of the prior art, the utility model aims to provide a female tubular construction of annular steam extraction in tower of direct air cooling system of natural draft formula to the axial fan among the natural draft cooling tower replacement conventional direct air cooling system eliminates or has reduced not enough that prior art exists effectively, has strengthened the ability that the unit resisted the environmental wind, has reduced unit operation backpressure, has increased the unit generated energy, has improved unit operation economic nature.
In order to achieve the above object, the utility model adopts the following technical means:
the utility model provides a female tubular construction of annular exhaust steam in tower of direct air cooling system of natural draft formula, includes the female pipe of exhaust steam, and the steam turbine exhaust steam of natural draft cooling tower is arranged in each group of air cooling condenser in the natural draft cooling tower by the female pipe introduction of exhaust steam, and the female pipe of exhaust steam arranges along natural draft cooling tower inner wall tower circumference annular and shunts to both sides through guiding device, and the female pipe of exhaust steam passes through exhaust branch pipe and communicates with every group of air cooling condenser nearby.
Optionally, the steam exhaust main pipe is formed by connecting a plurality of modular straight pipe sections into an annular pipe in a break angle mode.
Optionally, the straight pipe section is gradually reduced along the steam exhaust direction along with the flow change.
Optionally, the diameter-variable part of the straight pipe section is connected by an upper eccentric top flat type diameter-variable pipe.
Optionally, the diameter-variable positions of the straight pipe sections are connected by concentric pipes of annular pipes.
Optionally, the tail end of the steam exhaust main pipe is connected with a closed ring through a pi-shaped sealing device.
Optionally, the top elevations of all the straight pipe sections are consistent or the pipe center elevations are consistent.
Compared with the prior art, the structure of the application has the following advantages:
the utility model discloses an annular steam extraction female pipe structure in direct air cooling system tower of natural draft formula adopts the dog-ear form to connect for the ring canal by multisection modularization straight tube section, and the lot ization unloading of being convenient for, preparation and processing have simplified ring canal processing technology, have improved construction installation effectiveness. The annular arrangement mode of the steam exhaust pipeline in the cooling tower of the natural ventilation direct air cooling system optimizes the arrangement of the steam distribution pipe near the air cooling condenser, saves the using amount of pipes, reduces the pressure drop of the system steam exhaust, reduces the back pressure and increases the generating capacity of the unit.
Preferably, the annular pipeline adopts an upper eccentric top flat type reducing pipe type, most of hydrophobic water in the pipeline can be collected to the bottom of the large pipeline in a self-flowing mode, the arrangement of hydrophobic points is greatly reduced, the consumption of hydrophobic materials is saved, and the problems of numerous hydrophobic points, difficulty in discharging and collecting and the like are effectively solved.
Preferably, the concentric pipe type of the annular pipeline in the cooling tower of the natural ventilation direct air cooling system can ensure that most of hydrophobic water in the pipeline is collected to the bottom of the large pipeline by the small pipeline in a self-flowing mode, so that the arrangement of hydrophobic points and the use amount of hydrophobic materials are greatly reduced, and the problems of numerous hydrophobic points, difficult discharge and collection and the like are solved.
Preferably, the tail end of the steam exhaust main pipe is provided with the pi-shaped sealing device, so that the problem of pipeline thermal expansion self-compensation is solved, and a gate-shaped large space is formed by the pi-shaped sealing device, so that other pipelines or equipment can conveniently enter and exit the cooling tower, and the space in the tower is reasonably and effectively utilized.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a connection diagram of the straight pipe section break angle of the present invention.
Fig. 3 is a connection diagram of the upper eccentric top flat type reducer pipe of the present invention.
Fig. 4 is a connection diagram of the concentric tubes of the ring tube of the present invention.
Fig. 5 is a structural diagram of the pi sealing device of the present invention.
FIG. 6 is a diagram of a calculation model of local diameter variation of an upper eccentric top-flat type diameter variation pipe in engineering.
FIG. 7 is a calculation model diagram of local diameter variation of concentric tubular type of annular tube in engineering.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in figure 1, a steam exhaust main pipe 2 is annularly arranged along the periphery of a natural ventilation cooling tower 1 and is shunted to two sides through a flow guide device 3, the steam exhaust main pipe 2 is a circular pipe formed by connecting a plurality of modular straight pipe sections 4 in a break angle mode, the steam exhaust main pipe 2 is gradually reduced along the steam exhaust direction along with the flow change, an upper eccentric jacking flat type reducing pipe type 5 or an annular pipe concentric pipe type 7 is adopted at the reducing position, so that the drainage in the pipe can be collected to the bottom of the pipe in a self-flowing mode, and the number of drainage points is reduced. The tail end (taking the inlet as the head end) of the steam exhaust main pipe 2 is provided with the Pi-shaped sealing device 6, so that the problem of pipeline thermal compensation can be effectively solved, and the space in the tower can be fully utilized to facilitate the entering and exiting of other pipelines or equipment.
Specifically, the exhaust steam of the steam turbine is introduced into each group of air-cooled condensers arranged in a natural draft cooling tower through a steam exhaust main pipe 2, and the steam exhaust main pipe 2 is annularly arranged along the periphery of the natural draft cooling tower 1; the steam exhaust main pipe 2 comprises an inlet flow guide device, a multi-section bevel type straight pipe section, an upper eccentric top flat type reducer pipe or a concentric type reducer pipe, a pi-shaped sealing device and the like. The steam exhaust main pipe 2 is communicated with each group of air-cooled condensers through a steam exhaust branch pipe, cold air exchanges heat with the air-cooled condensers in the tower from the outside of the tower under the action of the pumping force of the natural ventilation cooling tower to become hot air, the hot air is exhausted from the top of the tower, and steam exhaust in the air-cooled condensers is condensed into water to be collected to a condensation water tank for recycling.
As shown in figure 2, the steam exhaust main pipe 2 is formed by connecting a plurality of modularized and easily-machined straight pipe sections 4 into a circular pipe in a turning mode. The air cooling condenser is connected with the annular exhaust main pipe 2 nearby through a pipeline.
As shown in fig. 5, the steam exhaust main pipe is provided with a pi-shaped sealing device at the tail end. The pi-shaped sealing device at the tail end of the steam exhaust main pipe structure can effectively solve the problem of pipeline thermal compensation and can fully utilize the space in the tower to facilitate the entry and exit of other pipelines or equipment.
Example 1
In the conventional design, the annular pipeline reducing usually adopts a mode of lower eccentric bottom elevation consistency, and the supporting mode of the pipe type is relatively simplified due to the fact that the bottom elevation consistency is achieved. However, aiming at the tower inner ring pipe with the diameter of hundreds of meters of the natural ventilation direct air cooling steam exhaust pipeline, the lower eccentric reducing pipe type is the same pipeline bottom elevation, so that the problem of troublesome drainage is caused, a plurality of drainage points are directly caused, and the drainage and collection are difficult. The utility model discloses with the tower inner ring pipe design of the direct air cooling exhaust pipe of natural draft for go up eccentric top flat cast, the mode that the inside most hydrophobic accessible of pipeline flows automatically is collected to big pipeline bottom by little pipeline.
In the direct air cooling system of natural draft, the exhaust ring pipe is because reducing step by step in the cooling tower, all sets up pipeline reducing department into upper eccentric top flat cast 5, and the upper portion top standard height of all pipelines is unanimous promptly, so can make hydrophobic smoothly by the bottom difference in height that the cast nature formed. Thereby obtaining an upper eccentric top flat pipe type of the annular pipeline in the cooling tower of the natural draft direct air cooling system.
As shown in figure 3, the steam exhaust main pipe 2 is gradually reduced along the steam exhaust direction along with the flow change, and the reducing positions are all set to be in an upper eccentric flat jacking shape, namely, the top elevations of the pipelines are consistent. The steam exhaust main pipe structure is gradually reduced along the steam exhaust direction along with the flow change, and an upper eccentric top flat type reducing pipe type 5 is adopted, so that the drainage in the pipe can be converged to the bottom of the pipe in a self-flowing mode, and the number of drainage points is reduced.
The upper eccentric jacking pipe type 5 of the annular pipeline in the cooling tower of the natural ventilation direct air cooling system can enable most of hydrophobic water in the pipeline to be collected to the bottom of the large pipeline through the small pipeline in a self-flowing mode, so that the arrangement of hydrophobic points and the use amount of hydrophobic materials are greatly reduced, and the problems of numerous hydrophobic points, difficulty in discharging and collecting and the like are solved.
An annular steam exhaust pipeline with the diameter of about 125m is arranged on the ground in a cooling tower of a natural ventilation direct air cooling system of a certain project, and the diameter of a circular pipe at the tower inlet is DN8500, and the diameter of the circular pipe is gradually reduced into DN6000, DN4200, DN3000 and DN2000 pipelines. The pipeline reducing positions are all of upper eccentric top flat pipe type, so that the requirements of smooth drainage and the like of the pipeline system are met.
The calculation model of the local diameter change of the ring pipe in the engineering is shown in figure 6.
Example 2
In the conventional design, the annular pipeline reducing usually adopts a mode of lower eccentric bottom elevation consistency, and the supporting mode of the pipe type is relatively simplified due to the fact that the bottom elevation consistency is achieved. However, aiming at the tower inner ring pipe with the diameter of hundreds of meters of the natural ventilation direct air cooling steam exhaust pipeline, the lower eccentric reducing pipe type is the same pipeline bottom elevation, so that the problem of troublesome drainage is caused, a plurality of drainage points are directly caused, and the drainage and collection are difficult. The utility model discloses with the tower inner ring pipe design of the direct air cooling exhaust pipe of natural draft for concentric cast, the mode that the inside most hydrophobic accessible of pipeline flows automatically is collected to big pipeline bottom by little pipeline.
As shown in fig. 4, in the natural draft direct air cooling system, the exhaust ring pipes in the cooling tower are gradually reduced, the pipeline reducing positions are all set to be concentric pipes 7, and the central elevations of all pipelines are consistent, so that drainage can be smoothly performed by the natural bottom height difference of the pipe type. Therefore, the concentric tube type of the annular pipeline in the cooling tower of the natural draft direct air cooling system is obtained.
The concentric pipe type of the annular pipeline in the cooling tower of the natural ventilation direct air cooling system can enable most of hydrophobic water in the pipeline to be collected to the bottom of the large pipeline through the small pipeline in a self-flowing mode, so that the arrangement of hydrophobic points and the use amount of hydrophobic materials are greatly reduced, and the problems of numerous hydrophobic points, difficulty in discharging and collecting and the like are solved.
An annular steam exhaust pipeline with the diameter of about 125m is arranged on the ground in a cooling tower of a natural ventilation direct air cooling system of a certain project, and the diameter of a circular pipe at the tower inlet is DN8500, and the diameter of the circular pipe is gradually reduced into DN6000, DN4200, DN3000 and DN2000 pipelines. The pipeline reducing positions are all concentric pipes, so that the requirements of smooth drainage and the like of the pipeline system are met.
The calculation model of the local diameter change of the ring pipe in the engineering is shown in figure 7.
To sum up, the utility model discloses an annular steam exhaust main pipe structure in tower of natural draft formula direct air cooling system, steam exhaust main pipe structure adopts dog-ear form to connect into the ring canal by multisection modularization straight tube section, is convenient for batch unloading, preparation and processing, has simplified ring canal processing technology, has improved the construction installation efficiency; the steam exhaust main pipe structure is gradually reduced along the steam exhaust direction along with the flow change, and an upper eccentric top flat type reducing pipe type or an annular pipe concentric pipe type is adopted, so that the drainage in the pipe can be converged to the bottom of the pipe in a self-flowing mode, the arrangement of drainage points is greatly reduced, the consumption of drainage materials is saved, and the problems of numerous drainage points, difficult discharge and collection and the like are effectively solved; the tail end of the steam exhaust main pipe structure is provided with the Pi-shaped sealing device, so that the problem of pipeline thermal compensation can be effectively solved, and the space in the tower can be fully utilized to facilitate the entry and exit of other pipelines or equipment.
Above, only be the preferred embodiment of the present invention, not limited to the implementation scope of the present invention, all the equivalent changes and modifications made according to the content of the present invention shall be the technical scope of the present invention.
The embodiments of the present invention are merely exemplary and not intended to limit the scope of the patent, and those skilled in the art can also make modifications to the embodiments without departing from the spirit and scope of the patent.
Claims (7)
1. The utility model provides a female tubular construction of annular steam extraction in tower of direct air cooling system of natural draft formula which characterized in that: the system comprises a steam exhaust main pipe (2), wherein steam exhaust of a steam turbine of a natural ventilation cooling tower (1) is introduced into each group of air-cooled condensers arranged in the natural ventilation cooling tower (1) through the steam exhaust main pipe (2), the steam exhaust main pipe (2) is annularly arranged along the inner wall tower circumference of the natural ventilation cooling tower (1) and shunts to two sides through a flow guide device (3), and the steam exhaust main pipe (2) is communicated with each group of air-cooled condensers nearby through a steam exhaust branch pipe.
2. The internal annular exhaust steam main pipe structure of the natural ventilation type direct air cooling system according to claim 1, characterized in that: the steam exhaust main pipe (2) is formed by connecting a plurality of modular straight pipe sections (4) into an annular pipe in a bevel mode.
3. The internal annular exhaust steam main pipe structure of the natural ventilation type direct air cooling system according to claim 2, characterized in that: the straight pipe section (4) is gradually reduced along the steam discharging direction along with the change of flow.
4. The internal annular exhaust steam main pipe structure of the natural ventilation type direct air cooling system according to claim 2, characterized in that: the diameter-variable positions of the straight pipe sections (4) are connected by annular concentric pipe type (7).
5. The internal annular exhaust steam main pipe structure of the natural ventilation type direct air cooling system according to claim 2, characterized in that: the diameter-variable positions of the straight pipe sections (4) are connected by adopting an upper eccentric top flat type diameter-variable pipe type (5).
6. The internal annular exhaust steam main pipe structure of the natural ventilation type direct air cooling system according to claim 2, characterized in that: the tail end of the steam exhaust main pipe (2) is connected with a closed loop through a pi-shaped sealing device (6).
7. The internal annular exhaust steam main pipe structure of the natural ventilation type direct air cooling system according to claim 2, characterized in that: the tube center elevations of all the straight tube sections (4) are consistent or the top elevations are consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921886657.7U CN210892855U (en) | 2019-11-04 | 2019-11-04 | Annular steam exhaust main pipe structure in tower of natural ventilation type direct air cooling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921886657.7U CN210892855U (en) | 2019-11-04 | 2019-11-04 | Annular steam exhaust main pipe structure in tower of natural ventilation type direct air cooling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109880A (en) * | 2022-07-13 | 2022-09-27 | 鞍钢股份有限公司 | Air supply equipment and method for air flow homogenization bustle pipe reducing blast furnace |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109880A (en) * | 2022-07-13 | 2022-09-27 | 鞍钢股份有限公司 | Air supply equipment and method for air flow homogenization bustle pipe reducing blast furnace |
| CN115109880B (en) * | 2022-07-13 | 2023-10-27 | 鞍钢股份有限公司 | Air supply equipment and method for air flow homogenizing hot air bustle pipe reducing blast furnace |
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