阅读说明：本技术 一种空冷岛的蒸汽分配系统 (Steam distribution system of air cooling island ) 是由 孙付成 牟晓哲 李战国 张昕 李媛园 于 2019-09-20 设计创作，主要内容包括：本发明提供一种空冷岛的蒸汽分配系统,包括排汽管以及多组与排汽管连通的蒸汽分配管,排汽管与排气装置连通,且各蒸汽分配管分别对应与多个对流管束连通,各蒸汽分配管中均设有气囊,各气囊分别与充气结构、抽气结构相连通,充气结构能向气囊充气,气囊能充气膨胀并封堵对应的蒸汽分配管,且抽气结构能抽取气囊中的气体,各气囊能抽气收缩并使对应的蒸汽分配管贯通。本发明采用气囊代替隔离阀,能有效降低成本；气囊充气膨胀后与蒸汽分配管内壁相抵接形成的密封效果要远高于隔离阀的密封效果；在气囊呈收缩状态时能顺利保证机组正常运行,且通过分别对气囊进行充气控制,能实现机组冬季启动及空冷岛冲洗操作的顺利进行。(The invention provides a steam distribution system of an air cooling island, which comprises a steam exhaust pipe and a plurality of groups of steam distribution pipes communicated with the steam exhaust pipe, wherein the steam exhaust pipe is communicated with an exhaust device, each steam distribution pipe is correspondingly communicated with a plurality of convection pipe bundles, each steam distribution pipe is internally provided with an air bag, each air bag is respectively communicated with an inflation structure and an air extraction structure, the inflation structure can inflate the air bags, the air bags can inflate and expand and block the corresponding steam distribution pipes, the air extraction structure can extract gas in the air bags, and each air bag can deflate and contract to ensure that the corresponding steam distribution pipes are communicated. The invention adopts the air bag to replace the isolating valve, thus effectively reducing the cost; the sealing effect formed by the abutting of the air bag after inflation and expansion and the inner wall of the steam distribution pipe is far higher than that of the isolation valve; the normal operation of the unit can be smoothly ensured when the air bag is in a contraction state, and the unit can be started in winter and the flushing operation of the air cooling island can be smoothly carried out by respectively controlling the air bag to be inflated.)

1. the utility model provides a steam distribution system of air cooling island, including steam exhaust pipe and multiunit with the steam distribution pipe of steam exhaust pipe intercommunication, steam exhaust pipe and exhaust apparatus intercommunication, and each the steam distribution pipe corresponds respectively and a plurality of convection bank intercommunication, its characterized in that, each all be equipped with the gasbag in the steam distribution pipe, each the gasbag is linked together with gas filled structure, air exhaust structure respectively, gas filled structure can to the gasbag is aerifyd, the gasbag can aerify the inflation and the shutoff correspond steam distribution pipe, just air exhaust structure can extract gas in the gasbag, each the gasbag can be pumped gas and shrunk and make correspond the steam distribution pipe link up.

2. The steam distribution system of an air cooling island according to claim 1, wherein the inflating structure comprises an inflating main pipe and a plurality of inflating branch pipes arranged corresponding to the air bags, one end of each inflating branch pipe is communicated with the inflating main pipe, and the other end of each inflating branch pipe is communicated with the corresponding air bag.

3. The air cooling island steam distribution system of claim 2, wherein each of the air inflation branch pipes is provided with an air inflation valve.

4. The steam distribution system of an air cooling island according to claim 1, wherein the air exhaust structure comprises an air exhaust main pipe and a plurality of air exhaust branch pipes arranged corresponding to the air bags, one end of each air exhaust branch pipe is communicated with the air exhaust main pipe, and the other end of each air exhaust branch pipe is communicated with the corresponding air bag.

5. The air-cooled island steam distribution system of claim 4, wherein each of the bleed manifolds includes a bleed valve.

6. the steam distribution system of the air cooling island according to any one of claims 1 to 5, wherein a positioning mesh plate is respectively arranged inside each steam distribution pipe on two sides of the corresponding air bag along the axial direction of the steam distribution pipe.

7. The air-cooled island steam distribution system of claim 6, wherein the positioning mesh panels are stainless steel positioning mesh panels.

8. the steam distribution system of the air cooling island according to claim 1, wherein each of the air bags is connected with a communication pipe, one end of each communication pipe is communicated with the corresponding air bag, and the other end of each communication pipe extends to the outside of the steam distribution pipe through the pipe wall of the corresponding steam distribution pipe and is communicated with the air suction structure and the air inflation structure through a tee joint.

9. The steam distribution system of the air cooling island according to claim 8, wherein a pipe wall of each steam distribution pipe is provided with a manhole, and each communicating pipe penetrates through the corresponding manhole of the steam distribution pipe.

10. the air cooling island steam distribution system of claim 9, wherein a cover plate is removably disposed at each access opening, and each communication pipe extends through the cover plate disposed at the corresponding access opening.

Technical Field

The invention relates to the technical field of steam distribution of air cooling islands, in particular to a steam distribution system of an air cooling island.

Background

the air cooling island is a heat exchange device for condensing and recovering steam turbine exhaust in a steam turbine generator unit, is used as an important component of a direct air cooling unit, and realizes the condensing and recovering of the steam turbine exhaust through forced or natural air convection in the running process of the unit. Specifically, steam discharged by the steam turbine enters the convection bank through the steam discharge pipe and the steam distribution pipe by the steam discharge device, the steam is condensed into water by forced cooling or natural convection cooling of the fan in the convection bank, and the condensed water flows back to the condensed water system through the condensed water pipeline. The steam is subjected to closed circulating cooling in the air cooling island and is not in contact with the outside, so that water source loss is avoided, and the water can be saved by about 90% compared with the traditional wet cooling unit.

In a general air cooling island design, isolation valves are installed at inlets of steam distribution pipes of each row of convection bank, and the steam inlet amount of each row of convection bank is controlled by adjusting the opening degree of each isolation valve in the operation process. Before the machine is built into production, the air cooling island needs to be flushed at a large flow rate, and in the flushing process, steam inlet of each row of convection tube bundles is controlled one by one through an isolation valve to ensure flushing flow. In the initial stage of starting the unit in winter, the steam turbine has small steam discharge amount, and generally, the steam is only introduced into one or two rows of convection tube bundles through the control of an isolation valve, so that the phenomenon that each row is frozen due to small steam amount caused by uniform steam introduction is avoided. However, the conventional isolation valves are large butterfly valves, the sealing effect is poor, and even if the isolation valves are completely closed, a small amount of steam is inevitably leaked in the process of starting in winter, so that the steam distribution pipe or the convection bank is partially frozen. The isolation valves are almost imported abroad, the cost of each isolation valve is nearly million, the isolation valves are kept in a normally open state in the normal operation process of the unit, the isolation valves are only operated when the unit is started and the air cooling island is flushed, the use frequency is low, the cost is high, the economy is poor, the isolation valves are cancelled in the initial design of part of newly-built power plants, and the inconvenience in the operation of starting the unit in winter and flushing the air cooling island is caused.

Disclosure of Invention

the invention aims to provide a steam distribution system of an air cooling island, which adopts an air bag capable of inflating and contracting to replace an isolation valve in the prior art, can effectively reduce the cost, improve the sealing effect and realize the plugging and the conduction of each steam distribution pipe so as to adapt to various operations.

In order to achieve the above purpose, the present invention provides a steam distribution system for an air cooling island, including a steam exhaust pipe and a plurality of groups of steam distribution pipes communicated with the steam exhaust pipe, wherein the steam exhaust pipe is communicated with an exhaust device, and each steam distribution pipe is correspondingly communicated with a plurality of convection pipe bundles, wherein each steam distribution pipe is provided with an air bag, each air bag is respectively communicated with an inflation structure and an air extraction structure, the inflation structure can inflate the air bags, the air bags can inflate and expand and seal the corresponding steam distribution pipes, the air extraction structure can extract gas in the air bags, and each air bag can deflate and contract and enable the corresponding steam distribution pipes to be communicated.

the steam distribution system of the air cooling island comprises an inflation main pipe and a plurality of inflation branch pipes, wherein the inflation branch pipes are arranged corresponding to the air bags, one end of each inflation branch pipe is communicated with the inflation main pipe, and the other end of each inflation branch pipe is communicated with the corresponding air bag.

The steam distribution system of the air cooling island is characterized in that each inflation branch pipe is provided with an inflation valve.

The steam distribution system of the air cooling island comprises an air extraction main pipe and a plurality of air extraction branch pipes which are arranged corresponding to the air bags, wherein one end of each air extraction branch pipe is communicated with the air extraction main pipe, and the other end of each air extraction branch pipe is communicated with the corresponding air bag.

The steam distribution system of the air cooling island is characterized in that each of the air exhaust branch pipes is provided with an air exhaust valve.

The steam distribution system of the air cooling island is characterized in that the steam distribution pipe is provided with a positioning mesh plate at two sides of the corresponding air bag along the axial direction of the steam distribution pipe.

The steam distribution system of the air cooling island, wherein the positioning mesh plate is made of stainless steel.

The steam distribution system of the air cooling island is characterized in that each air bag is respectively connected with a communicating pipe, one end of each communicating pipe is communicated with the corresponding air bag, and the other end of each communicating pipe respectively penetrates through the pipe wall of the corresponding steam distribution pipe to extend to the outside of the steam distribution pipe and is communicated with the air exhaust structure and the inflation structure through a tee joint.

in the steam distribution system of the air cooling island, the pipe wall of each steam distribution pipe is respectively provided with an access hole, and each communicating pipe respectively penetrates through the access hole on the corresponding steam distribution pipe.

in the steam distribution system of the air cooling island, each access hole can be detachably provided with a cover plate, and each communicating pipe penetrates through the cover plate arranged at the corresponding access hole.

Compared with the prior art, the invention has the following advantages:

The steam distribution system of the air cooling island provided by the invention adopts the airbag which can be inflated and deflated to replace an isolation valve in the prior art, so that the cost can be effectively reduced; meanwhile, the sealing effect formed by abutting the air bag with the inner wall of the steam distribution pipe after inflation and expansion is far higher than that of the isolation valve in the prior art; in addition, the normal operation of the unit can be smoothly ensured when the air bag is in a contraction state, and the smooth operation of the unit in winter starting and the flushing operation of the air cooling island can be realized by respectively controlling the air bag to inflate.

drawings

the drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

Fig. 1 is a schematic structural diagram of a steam distribution system of an air cooling island provided by the invention.

The reference numbers illustrate:

1. a steam exhaust pipe;

2. A steam distribution pipe;

21. Positioning a screen plate;

22. A cover plate;

3. An air bag;

31. A communicating pipe;

4. an inflatable structure;

41. Inflating the main pipe;

42. An inflation branch pipe;

421. An inflation valve;

5. an air extraction structure;

51. An air exhaust main pipe;

52. An air exhaust branch pipe;

521. An air extraction valve.

Detailed Description

In order to clearly understand the technical solution, the purpose and the effect of the present invention, a detailed description of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1, the present invention provides a steam distribution system for an air cooling island, which comprises a steam exhaust pipe 1 and a plurality of groups of steam distribution pipes 2 communicated with the steam exhaust pipe 1, wherein the steam exhaust pipe 1 is communicated with an exhaust device, and each steam distribution pipe 2 is correspondingly communicated with a plurality of convection pipe bundles, wherein each steam distribution pipe 2 is provided with an air bag 3, each air bag 3 is respectively communicated with an inflation structure 4 and an air extraction structure 5, the inflation structure 4 can inflate the air bags 3, so that the air bags 3 are inflated and expanded until the outer surfaces of the air bags 3 are in contact with the inner surfaces of the corresponding steam distribution pipes 2, and thus the corresponding steam distribution pipes 2 are completely sealed, at this time, the operation of starting the unit in winter and flushing the air cooling island can be realized, and the air extraction structure 5 can extract the gas in the air bags 3, so that the air bags 3 shrink, at this time, the outer surfaces of the air bags, the steam distribution pipes 2 are communicated, and steam can pass through the air bags 3 and the inner surfaces of the steam distribution pipes 2, so that the normal operation of the unit is ensured; the invention adopts the air bag 3 to replace an isolation valve, has low manufacturing cost and low later maintenance and replacement cost, has good air sealing performance of the air bag 3, and can effectively avoid the freezing problem caused by steam leakage.

Further, as shown in fig. 1, in the steam distribution system of the air cooling island provided by the present invention, the inflation structure 4 includes an inflation main pipe 41 and a plurality of inflation branch pipes 42 corresponding to the air bags 3, one end of each inflation branch pipe 42 is communicated with the inflation main pipe 41, the other end of each inflation branch pipe 42 is communicated with the corresponding air bag 3, each air bag 3 is inflated through the corresponding inflation branch pipe 42, so as to realize independent inflation of each air bag 3, and each inflation branch pipe 42 is provided with an inflation valve 421, so as to cooperate with the air extraction structure 5 to control the air inflow of each steam distribution pipe 2 and control the independent closing of each steam distribution pipe 2, and the inflation air source is compressed air for an instrument in a plant.

Further, as shown in fig. 1, the steam distribution system of the air cooling island provided by the present invention, wherein the air extracting structure 5 includes an air extracting main pipe 51 and a plurality of air extracting branch pipes 52 corresponding to the air bags 3, one end of each air extracting branch pipe 52 is communicated with the air extracting main pipe 51, the other end of each air extracting branch pipe 52 is communicated with the corresponding air bag 3, each air bag 3 realizes air extracting operation through the corresponding air extracting branch pipe 52, so as to realize independent air extraction of each air bag 3, and each air extracting branch pipe 52 is provided with an air extracting valve 521, so as to realize independent air extracting operation of each air bag 3, so as to cooperate with the inflating structure 4 to control the air inflow of each steam distribution pipe 2 and control the independent opening of each steam distribution pipe 2; the air is pumped into a vacuum system of an air cooling island steam engine.

Preferably, as shown in fig. 1, the steam distribution system of the air cooling island provided by the present invention, wherein the inside of each steam distribution pipe 2 is provided with a positioning mesh plate 21 respectively corresponding to two sides of the corresponding air bag 3 along the axial direction of the steam distribution pipe 2, and the positioning mesh plates 21 are arranged to maintain the position of the air bag 3 during inflation, deflation and contraction of the air bag 3 and the passage of steam through the steam distribution pipe 2.

preferably, the positioning mesh plate 21 is made of stainless steel so as to prevent the positioning mesh plate 21 from rusting due to contact with moisture in steam.

furthermore, as shown in fig. 1, in the steam distribution system of the air cooling island provided by the present invention, each air bag 3 is respectively connected with a communicating pipe 31, one end of each communicating pipe 31 is communicated with the corresponding air bag 3, the other end of each communicating pipe 31 respectively penetrates through the pipe wall of the corresponding steam distribution pipe 2 to extend to the outside of the steam distribution pipe 2 and is communicated with the air pumping structure 5 and the air charging structure 4 through a tee joint, and the air charging structure 4 and the air pumping structure 5 can be respectively communicated with the communicating pipes 31 through a tee joint, so as to implement the air charging operation and the air pumping operation.

Preferably, as shown in fig. 1, in the steam distribution system of the air cooling island provided by the present invention, the pipe wall of each steam distribution pipe 2 is respectively provided with an access hole, and each access hole is detachably provided with a cover plate 22, each communicating pipe 31 respectively penetrates through the cover plate 22 arranged at the access hole on the corresponding steam distribution pipe 2, and the access hole is used for a worker to enter the steam distribution pipe 2 to repair, clean or replace the airbag 3 and the two positioning net plates 21.

Compared with the prior art, the invention has the following advantages:

The steam distribution system of the air cooling island provided by the invention adopts the airbag which can be inflated and deflated to replace an isolation valve in the prior art, so that the cost can be effectively reduced; meanwhile, the sealing effect formed by abutting the air bag with the inner wall of the steam distribution pipe after inflation and expansion is far higher than that of the isolation valve in the prior art; in addition, the normal operation of the unit can be smoothly ensured when the air bag is in a contraction state, and the smooth operation of the unit in winter starting and the flushing operation of the air cooling island can be realized by respectively controlling the air bag to inflate.

the above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.