Air cooling and condensing system and anti-freezing and anti-rust method based on air cooling and condensing system

Abstract

The invention relates to the field of air condensing devices, in particular to an air condensing system and an anti-freezing and anti-rust method based on the system. The system comprises at least two columns of air coolers; the inflating unit is used for inflating shielding gas into the cut air coolers; the inflation unit comprises a gas source for providing protective gas; the air source comprises a plurality of air outlet ends; each air outlet end is provided with a first valve for controlling the opening and closing of the air outlet end; the steam extraction unit comprises a steam extractor, and the steam extractor is provided with a main extraction opening and an extraction opening; the main extraction opening is provided with a plurality of main extraction steam extraction ends communicating with the air coolers in a one-to-one correspondence mode. Each main extraction steam extraction end is provided with a second valve for controlling the on-off of the main extraction steam extraction end; the extraction opening comprises a plurality of extraction steam extraction ends which are communicated with the air coolers in a one-to-one correspondence manner; each extraction steam extraction end is provided with a third valve for controlling the on-off of the extraction steam extraction end; the anti-freezing and anti-rust paint is beneficial to freezing prevention and rust prevention during operation in winter.

Description

Technical Field

[0001] The present application relates to the field of air-cooled condensers, and in particular to an air-cooled condenser system and an antifreeze and antirust method based on the system. Background Art

[0002] The air condensing system is mainly used to condense the steam discharged from the steam turbine; it is mainly composed of multiple rows of air coolers. Users can choose a specific number of rows of air coolers to put into use according to actual needs. In other words, the air coolers are cut off and the cut air coolers are equivalent to idle air coolers and are not put into use.

[0003] In a low temperature environment, such as winter, due to the low ambient temperature, if all air coolers are put into use, the steam fans will be more dispersed, and the low ambient temperature will easily cause frostbite to the pipes and other components in the condensing system; therefore, the air coolers are generally disconnected in winter to reduce the number of air coolers in use.

[0004] However, this method of using the air coolers in series also has certain disadvantages, mainly manifested in the following aspects: first, some condensed water may remain in the air cooler being cut off, and the air cooler is not a perfect closed system, and there will be some leaks, so that some water vapor in the ambient air enters the air cooler through these leaks, which will freeze the pipes of the air cooler being cut off in winter and is also prone to rust, so there is still room for improvement. Summary of the invention

[0005] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present application is to provide an air-cooled condensing system and an antifreeze and antirust method based on the system.

[0006] To achieve the above objectives, this application provides the following technical solutions.

[0007] In one aspect, the present application provides an air-cooled condensing system, comprising: At least two rows of air coolers, each row of the air coolers includes a steam main pipe, an air cooling pipe bundle, and a condensate pipe; the condensate pipe is provided with a drain valve; the steam inlet of the steam main pipe is provided with a steam shut-off valve; A charging unit is used to charge the protective gas into the air coolers to be connected; the charging unit includes a gas source for providing the protective gas; the gas source includes a plurality of gas outlets for outputting the protective gas, which are connected to each air cooler in a one-to-one correspondence; each of the gas outlets is provided with a first valve for controlling the opening and closing of the gas outlet; The steam extraction unit is used to extract steam from the air cooler, and comprises a steam extractor, wherein the steam extractor has a main extraction port and a starting extraction port; the main extraction port is provided with a plurality of main extraction steam extraction ends which are connected one-to-one with each air cooler; each of the main extraction steam extraction ends is provided with a second valve which controls the on-off of the main extraction steam extraction end; the starting extraction port comprises a plurality of starting extraction steam extraction ends which are connected one-to-one with each air cooler; each starting extraction steam extraction end is provided with a third valve which controls the on-off of the starting extraction steam extraction end.

[0008] As an optional embodiment of the present application, the inflation unit also includes a self-operated regulating valve, which is arranged on the output side of the gas source (providing nitrogen) to maintain the gas pressure downstream of the self-operated regulating valve at a set value.

[0009] As an optional implementation of the present application, at least one safety valve is provided on the output side of the gas source.

[0010] As an optional embodiment of the present application, the inflation unit includes a plurality of inflation branch pipes corresponding one to one with the air cooler; one end of the inflation branch pipe is connected to the output side of the air source, and the other end is connected to the air cooler; the first valve is arranged on the inflation branch pipe.

[0011] As an optional embodiment of the present application, the steam extraction unit includes a number of main extraction branch pipelines corresponding one-to-one to the air coolers, one end of the main extraction branch pipeline is connected to the air cooler, and the other end is connected to the main extraction port; the second valve is arranged on the main extraction branch pipeline; and / or the steam extraction unit includes a number of starting extraction branch pipelines corresponding one-to-one to the air coolers, one end of the starting extraction branch pipeline is connected to the air cooler, and the other end is connected to the starting extraction port; the third valve is arranged on the starting extraction branch pipeline.

[0012] As an optional implementation of the present application, the system also includes a plurality of condensate discharge pipelines corresponding one to one with the air cooler, one end of the condensate discharge pipeline is connected to the condensate pipeline of the air cooler, and the other end constitutes a condensate discharge outlet; each condensate discharge pipeline is provided with a fourth valve.

[0013] As an optional implementation of the present application, the protective gas is nitrogen.

[0014] As an optional implementation of the present application, each row of air coolers is provided with an air pressure detection component for detecting the internal air pressure of the air cooler.

[0015] On the other hand, the present application also provides an antifreeze and antirust method based on the above-mentioned air-cooled condensing system, comprising the following steps: Among the rows of air coolers, at least one row of air coolers is put into operation and recorded as an operating air cooler, and the other air coolers are recorded as disconnected row air coolers for disconnection processing; the disconnection processing of the disconnected row air coolers includes the following steps: S1. Close the steam shut-off valve corresponding to the air cooler to cut off the steam from entering the air cooler; close the second valve corresponding to the air cooler; and cut off the condensate pipeline corresponding to the air cooler; S2. Open the first valve corresponding to the column air cooler; pass the protective gas provided by the gas source into the column air cooler; and open the drain valve of the column air cooler; when the air pressure in the column air cooler reaches the set value, close the drain valve corresponding to the column air cooler, and keep the air pressure in the column air cooler at the set value.

[0016] As an optional implementation mode of the present application, when the disconnected air cooler needs to be put into operation again, the following operation steps are included: S3, close the first valve corresponding to the air cooler of the column to be put into operation; open the third valve corresponding to the air cooler of the column to be put into operation; extract air from the air cooler of the column to be put into operation through the extraction port of the steam extractor, and when the pressure in the air cooler of the column to be put into operation drops to the set pressure, close the third valve; S4. Close the extraction port of the steam extractor; open the second valve corresponding to the air cooler to be put into operation; open the condensate pipeline corresponding to the air cooler to be put into operation; finally, open the steam shut-off valve corresponding to the air cooler to be put into operation, and pass steam to operate it.

[0017] As an optional implementation of the present application, in step S2, the set value is 30 kPa higher than the ambient air pressure.

[0018] Compared with the prior art, this application has the following beneficial effects: In the present application, after the air cooler is disconnected, a protective gas, such as nitrogen, can be filled into the disconnected air cooler. During the process of filling nitrogen, the nitrogen will discharge the condensed water and air in the pipeline of the disconnected air cooler, thereby reducing the water content and oxygen content in the pipeline of the air cooler, thereby reducing the problem of frostbite of the disconnected air cooler due to low temperature. Since the water vapor in the air in the pipeline is blown out, the pipeline is not prone to rust; thus, the purpose of anti-freezing and anti-rust is achieved.

[0019] Moreover, the air cooler after cutting always maintains nitrogen at a certain pressure (greater than the ambient pressure), which can ensure that the air pressure in the pipeline is always greater than the ambient pressure. In this way, even if there is a leak in the air cooler, the air in the external environment will not enter the pipeline, thereby ensuring that the pipeline will not be frozen or rusted due to the air entering the leak.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become readily understood. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, wherein: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0022] Figure 1 The schematic diagram of the structure of the present application using two rows of air coolers is shown; Figure 2 The present application shows a system diagram using two rows of air coolers; Figure 3 The present application shows a system diagram using three rows of air coolers.

[0023] Description of the numbers in the figure: 11. Steam main pipe; 111. Steam shut-off valve; 12. Air cooling tube bundle; 13. Condensate pipeline; 14. Connecting pipe;.

[0024] 21, steam extraction device; 211, extraction port; 212, main extraction port; 22, main extraction branch pipeline; 221, second valve; 23, extraction branch pipeline; 231, third valve; 31. Gas source; 32. Inflatable branch pipeline; 321. First valve; 33. Safety valve; 34. Self-operated regulating valve; 41. Condensate discharge pipeline; 411. Fourth valve; 412. Drain valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0026] Example 1 In order to reduce the problem of frostbite and rust on the pipes of the disconnected air cooler in the air cooler system in a cold environment (such as winter), the present embodiment provides an air cooler system.

[0027] In order to facilitate understanding, we must first explain the disconnection: Generally speaking, the air-cooled condensing system generally includes multiple rows of air coolers that can be individually controlled to be on and off; disconnecting an air cooler is equivalent to cutting off the air cooler and making it unused. In short, the disconnected air cooler is equivalent to an idle, non-operating air cooler. Generally speaking, the system usually needs to be disconnected when it is running in winter.

[0028] Combination Figure 1-3 As shown, the air-cooled condensing system provided in this embodiment mainly includes at least two rows of air coolers, an air charging unit, a steam extraction unit, a condensate discharge pipeline 41, etc., and each component is described in detail below.

[0029] The structures of each row of air coolers are basically the same. Each air cooler is equivalent to an independent steam condensing unit for condensing steam. As for this system, the specific number of air coolers can be selected according to actual needs, for example Figure 1 and Figure 2 The example shows the use of two rows of air coolers. Figure 3 The case where three rows of air coolers are used is shown.

[0030] Since the basic structure of each row of air coolers is the same, for the sake of easy understanding, this embodiment takes one row of air coolers as an example for specific description: like Figure 1 and Figure 2 As shown, the air cooler includes a steam main pipe 11, an air cooling tube bundle 12, and a condensate pipe 13; the steam main pipe 11 is mainly used for the steam to be condensed to pass through, that is, the steam passes into the steam main pipe 11 from the steam inlet of the steam main pipe 11; in order to be able to control the on-off of the steam inlet to cut off the steam from entering the steam main pipe 11, a steam cut-off valve 111 is provided at the steam inlet of the steam main pipe 11.

[0031] The air-cooling tube bundle 12 is mainly composed of a tube bundle structure composed of a plurality of heat exchange tubes; an air cooler may include multiple groups of air-cooling tube bundles 12, and the steam is air-cooled when flowing in the air-cooling tube bundles 12.

[0032] Combination Figure 1 As shown, the condensate pipeline 13 is generally arranged at the lower side of the air-cooling tube bundle 12 and communicated with the air-cooling tube bundle 12, and is used to collect condensate formed by condensation of steam.

[0033] In some embodiments, in an air-cooling tube bundle 12 in a row of air coolers, part of the air-cooling tube bundle 12 is used as a downstream tube bundle, and the other part is used as a reverse flow tube bundle; the two ends of the downstream tube bundle are respectively connected to the steam main 11 and the condensate pipeline; and the reverse flow tube bundle has one end connected to the condensate pipeline 13 and the other end connected to the same connecting pipe 14. Figure 2For example, the air-cooling tube bundle 12 connected to the connecting pipe 14 is a counter-current tube bundle, and the other air-cooling tube bundles 12 are co-current tube bundles.

[0034] like Figure 2 As shown, the steam extraction unit is mainly used to extract steam from the air cooler, and the steam extraction unit mainly includes a steam extractor 21 , and the steam extractor 21 has a main extraction port 212 and a starting extraction port 211 .

[0035] It can be understood that, in some embodiments, the steam extractor 21 can be two separate steam extractors 21, one as a main steam extractor providing a main extraction port 212, and the other as a starting steam extractor providing a starting extraction port 211.

[0036] Of course, in some other embodiments, the steam extractor 21 may also be an integral module, which provides a main extraction port 212 and a starting extraction port 211 respectively.

[0037] The operation of the air cooler is generally that when the air cooler is started, steam is extracted from the starting extraction port 211, and after the starting extraction is completed, it switches to the main extraction port 212 for steam extraction.

[0038] The main extraction port 212 is provided with a plurality of main extraction steam extraction ends which are connected to each air cooler in a one-to-one correspondence; that is, one main extraction steam extraction end corresponds to one row of air coolers and is connected to the row of air coolers; each of the main extraction steam extraction ends is provided with a second valve 221 which controls the on and off of the main extraction steam extraction end.

[0039] Each main extraction steam end is equivalent to a plurality of branch lines branched from the main extraction port 212, for example: The steam extraction unit includes a plurality of main extraction branch pipelines 22 corresponding to the air coolers one by one, and a main extraction main pipeline is equivalent to a main extraction steam extraction end; Figure 2 For example, two rows of air coolers correspond to two main extraction and branch pipelines 22; Figure 3 The figure shows a three-row air cooling system corresponding to three main extraction and branch pipelines 22 .

[0040] One end of the main extraction branch pipeline 22 is connected to the main extraction port 212, and the other end is connected to the air cooler. Specifically, the other end of the main extraction branch pipeline 22 is connected to the connecting pipe 14. The second valve 221 is arranged on the main extraction branch pipeline 22 to control the opening and closing of the corresponding main extraction branch pipeline 22.

[0041] The extraction port 211 includes a plurality of extraction steam ends connected to each air cooler in a one-to-one correspondence, that is, one extraction steam end corresponds to one air cooler and is connected to the air cooler; each extraction steam end is provided with a third valve 231 for controlling the on and off of the extraction steam end.

[0042] Similar to the main extraction steam end, each extraction steam end is equivalent to a plurality of branch lines branched from the extraction port 211, for example: The steam extraction unit includes a plurality of extraction branch pipelines 23 corresponding to the air coolers one by one, and one extraction branch pipeline 23 is equivalent to a steam extraction end; Figure 2 The figure shows the situation where two rows of air coolers correspond to two extraction branches 23; Figure 3 The figure shows the situation where three rows of air coolers correspond to three extraction branches 23 .

[0043] One end of the extraction branch pipeline 23 is connected to the extraction port 211, and the other end is connected to the air cooler. Specifically, the other end of the extraction branch pipeline 23 is connected to the connecting pipe 14. The third valve 231 is provided on the extraction branch pipeline 23 to control the opening and closing of the extraction branch pipeline 23.

[0044] The charging unit is used to charge the protective gas into the air cooler being cut off; the charging unit includes a gas source 31 for providing the protective gas, and the protective gas provided by the gas source 31 can be nitrogen.

[0045] The gas source 31 includes a plurality of gas outlets for outputting protective gas, which are connected to each air cooler in a one-to-one correspondence, that is, one gas outlet corresponds to one air cooler; the gas outlet here can be understood as the output side of the gas source 31 (i.e., the output end for outputting protective gas) branching into multiple branches, and one branch constitutes one gas outlet; for example: The charging unit includes a plurality of charging branch pipes 32 corresponding to the air coolers one by one, and one charging branch pipe 32 is equivalent to an outlet; Figure 2 The figure shows the situation where two rows of air coolers correspond to two charging branch pipes 32. Figure 3 The illustrated example shows a situation where three rows of air coolers correspond to three charging branch pipes 32 .

[0046] Among them, Figure 2 As shown, one end of the charging branch pipeline 32 is connected to the output side of the gas source 31, and the other end is connected to the air cooler, for example, the other end of the charging branch pipeline 32 is connected to the steam main pipeline 11; each of the gas outlet ends is provided with a first valve 321 for controlling the on-off of the gas outlet end, that is, the first valve 321 is arranged on the charging branch pipeline 32 to individually control the on-off of the charging branch pipeline 32.

[0047] When charging with protective gas (such as nitrogen), the protective gas output from the output side of the gas source 31 is introduced into the steam main pipe 11 of the air cooler corresponding to the charging branch pipe 32 via the charging branch pipe 32 .

[0048] The condensate discharge pipeline 41 is mainly used to discharge the condensate in the condensate pipeline 13. One row of air coolers is correspondingly provided with a condensate discharge pipeline 41. Figure 2 It shows the situation that two rows of air coolers correspond to two condensate discharge pipes 41; Figure 3 The diagram shows a situation where three rows of air coolers correspond to three condensate discharge pipes 41 .

[0049] Among them, one end of the condensate discharge pipeline 41 is connected to the condensate pipeline 13 of the air cooler, and the other end constitutes a condensate discharge outlet. In some embodiments, such as Figure 2 and Figure 3 As shown, the condensate discharge outlets of all condensate discharge pipelines 41 are gathered at the same point for unified discharge.

[0050] In order to individually control the on / off of each condensate pipeline 13 , a fourth valve 411 is provided on each condensate discharge pipeline 41 .

[0051] In order to discharge water and air in the air cooler during inflation, a drain valve 412 is provided on each condensate pipeline 13 , and the drain valve 412 is provided upstream of the fourth valve 411 , that is, the drain valve 412 is provided between the condensate pipeline 13 and the fourth valve 411 .

[0052] It is worth noting that the drain valve 412 in this embodiment is mainly used to discharge water and air in the air cooler being disconnected during the disconnection process; it is mainly reflected in: When switching, in order not to interfere with the condensate discharge of other air coolers that have not been switched on (i.e., the air coolers put into use), the fourth valve 411 corresponding to the air cooler that has been switched on needs to be closed; in order to ensure that the condensate and air in the air cooler that has been switched on are discharged during the switching process, the drain valve 412 can be opened to drain the condensate and air in the air cooler that has been switched on.

[0053] In some embodiments, such as Figure 2 As shown, at least one safety valve 33 is provided at the output side of the gas source 31 , and generally two safety valves 33 are used, one safety valve 33 is used as a main valve, and the other safety valve 33 is used as a backup valve. The two safety valves 33 are connected in series at the output side of the gas source 31 .

[0054] In addition, the inflation unit further includes a self-operated regulating valve 34 , which is disposed at the output side of the gas source 31 (providing nitrogen) to maintain the gas pressure downstream of the self-operated regulating valve 34 at a set value. Specifically, the self-operated regulating valve 34 is located upstream of the two safety valves 33 .

[0055] The self-operated regulating valve 34, also generally referred to as a pressure regulating valve, is mainly used to regulate the air pressure downstream thereof to maintain it within a set value range. The set value here can be designed according to actual needs. For example, in some embodiments, the set value is 30 kPa higher than the ambient pressure value, that is, the set value is equivalent to the ambient pressure plus 30 kPa.

[0056] In this embodiment, the gas source 31 is normally open. When the internal air pressure of the disconnected air cooler is lower than the set value due to air leakage, the self-operated regulating valve 34 will automatically adjust to allow the gas source 31 to add sufficient nitrogen to the air cooler until the air pressure in the air cooler is maintained at the set value.

[0057] In addition, in some embodiments, in order to be able to monitor the air pressure value inside the air cooler in real time, each row of air coolers is provided with an air pressure detection device (not shown in the figure) for detecting the air pressure inside the air cooler. For example, an air pressure meter or an air pressure sensor is used as the air pressure detection device.

[0058] As a specific embodiment, Figure 2 The case of using two rows of air coolers is shown. In order to distinguish them, the two rows of air coolers are respectively recorded as row A air cooler and row B air cooler; correspondingly, Figure 3 The example shows a situation where three rows of air coolers are used. For the sake of distinction, they are respectively recorded as row A air cooler, row B air cooler, and row C air cooler.

[0059] Example 2 Combination Figure 1-3 As shown, this embodiment further provides an antifreeze and antirust method for an air-cooled condenser system based on the embodiment 1 on the basis of the embodiment 1, which is mainly used for antifreeze and antirust of the air coolers in the series.

[0060] The above method mainly includes the following steps: first, among the rows of air coolers, at least one row of air coolers is put into operation and recorded as the operating air cooler, and the other air coolers are recorded as the disconnected air coolers for disconnection processing.

[0061] The disconnection process of the disconnecting air cooler comprises the following steps: S1. Close the steam shut-off valve 111 corresponding to the air cooler in the cut column to cut off the steam from entering the air cooler in the cut column; close the second valve 221 corresponding to the air cooler in the cut column; and cut off the condensate pipeline 13 corresponding to the air cooler in the cut column; S2. Open the first valve 321 corresponding to the column air cooler; pass the protective gas provided by the gas source 31 into the column air cooler; and open the drain valve 412 of the column air cooler; when the air pressure in the column air cooler reaches the set value, close the drain valve 412 corresponding to the column air cooler, and keep the air pressure in the column air cooler at the set value.

[0062] For ease of understanding, Figure 2 For example, in Figure 2 In the example, the air cooler of column A is put into use, and the air cooler of column B is used as the column cutting air cooler for column cutting treatment; it is worth noting that during the whole column cutting process, the air cooler of column A is in operation.

[0063] Combination Figure 2As shown, the B column air cooler disconnection processing steps are as follows: S1. Close the steam shut-off valve 111 corresponding to the air cooler in row B to stop inputting steam into the air cooler in row B; and close the second valve 221 of the air cooler in row B, so that the steam extractor 21 will no longer extract steam from the air cooler in row B. And cut off the condensate pipeline 13 corresponding to the air cooler in row B. The way to cut off the condensate pipeline 13 is to close the fourth valve 411 corresponding to the air cooler in row B.

[0064] S2. Open the first valve 321 corresponding to the air cooler in column B. The nitrogen output from the gas source 31 is passed through the first valve 321 of the air cooler in column B into the steam main pipe 11 of the air cooler in column B, thereby entering the entire air cooler in column B. At the same time, open the drain valve 412 of the air cooler in column B. As the nitrogen is continuously input into the air cooler in column B, the condensed water and air remaining in the air cooler in column B will be discharged through the drain valve 412, thereby emptying the condensed water and air in the air cooler in column B. In this way, there is no air and water in the air cooler in column B. Even in the low temperature environment in winter, the air cooler in column B is not easily frozen or rusted.

[0065] When the air pressure in the B column air cooler reaches the set value, for example, 30 kPa higher than the ambient pressure, the drain valve 412 corresponding to the B column air cooler is closed; subsequently, under the action of the self-operated regulating valve 34, the air pressure in the B column air cooler is always maintained at the set value (higher than the ambient pressure). Under the action of the air pressure difference, even if there is a leakage point in the B column air cooler, the air from the external environment cannot enter the B column air cooler through the leakage point, so as to ensure that the B column air cooler is not easily frozen and rusted.

[0066] When the B-row air cooler needs to be put into operation again (i.e. put into use or put into operation), the following steps are used for commissioning: S3. Close the first valve 321 corresponding to the air cooler in column B to stop inputting nitrogen into the air cooler in column B; then, open the third valve 231 corresponding to the air cooler in column B to connect the air cooler in column B with the extraction port 211, and evacuate the air cooler in column B through the extraction port 211 of the steam extractor 21 to extract the nitrogen in the air cooler in column B; as the nitrogen is continuously extracted, the pressure in the air cooler in column B gradually decreases, and when the pressure value in the air cooler in column B decreases to the set pressure value, close the third valve 231 corresponding to the air cooler in column B.

[0067] S4. Then close the extraction port 211 of the extraction device 21 to stop the extraction action; open the second valve 221 corresponding to the air cooler of column B, so that the main extraction port 212 is connected with the air cooler, and extract steam from the air cooler of column B through the main extraction port 212; then open the condensate pipeline 13 corresponding to the air cooler of column B, specifically, open the fourth valve 411 corresponding to the air cooler of column B to ensure that the air cooler of column B can discharge condensate normally through the condensate pipeline 13.

[0068] Finally, the steam shut-off valve 111 corresponding to the air cooler in row B is opened, and steam is introduced for operation, so that the air cooler in row B starts to condense the steam.

[0069] In this embodiment, each row of air coolers is equivalent to setting two steam extraction pipelines to connect the extraction port and the main extraction port respectively. The advantages of this arrangement are: Before the B-row air cooler is put into use, since the air pressure in the B-row air cooler is higher than the atmospheric pressure, and the air cooler in the A-row is under negative pressure, if a single steam extraction pipeline is provided, the pressure of the B-row air cooler will be transmitted to the A-row air cooler along the steam extraction pipeline, and even to the turbine outlet, which will cause the turbine to trip; therefore, two steam extraction pipelines are provided in this embodiment, and the nitrogen pressure in the B-row is first pumped to the set pressure (for example, 20kpaA) before being put into operation.

[0070] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution disclosed in this application can be achieved, and this document is not limited here.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. Air-cooled condensing system, characterized in that: include: At least two rows of air coolers, each row of the air coolers includes a steam main pipe, an air cooling pipe bundle, and a condensate pipe; the condensate pipe is provided with a drain valve; the steam inlet of the steam main pipe is provided with a steam shut-off valve; A charging unit is used to charge the protective gas into the air coolers to be connected; the charging unit includes a gas source for providing the protective gas; the gas source includes a plurality of gas outlets for outputting the protective gas, which are connected to each air cooler in a one-to-one correspondence; each of the gas outlets is provided with a first valve for controlling the opening and closing of the gas outlet; A steam extraction unit, used for extracting steam from the air cooler, comprises a steam extractor, wherein the steam extractor has a main extraction port and a starting extraction port; The main extraction port is provided with a plurality of main extraction steam extraction ends which are connected to each air cooler in a one-to-one correspondence; each of the main extraction steam extraction ends is provided with a second valve which controls the on-off of the main extraction steam extraction end; the starting extraction port includes a plurality of starting extraction steam extraction ends which are connected to each air cooler in a one-to-one correspondence; each starting extraction steam extraction end is provided with a third valve which controls the on-off of the starting extraction steam extraction end.

2. The air-cooled condenser system according to claim 1, characterized in that: The inflation unit further comprises a self-operated regulating valve, which is arranged at the output side of a gas source (providing nitrogen) so that the gas pressure downstream of the self-operated regulating valve is maintained at a set value.

3. The air-cooled condenser system according to claim 1 or 2, characterized in that: At least one safety valve is disposed on the output side of the gas source.

4. The air-cooled condenser system according to claim 1, characterized in that: The charging unit includes a plurality of charging branch pipelines corresponding to the air coolers one by one; one end of the charging branch pipeline is connected to the output side of the air source, and the other end is connected to the air cooler; the first valve is arranged on the charging branch pipeline.

5. The air-cooled condenser system according to claim 1, characterized in that: The steam extraction unit includes a number of main extraction branch pipelines corresponding one-to-one to the air coolers, one end of the main extraction branch pipeline is connected to the air cooler, and the other end is connected to the main extraction port; the second valve is arranged on the main extraction branch pipeline; and / or the steam extraction unit includes a number of starting extraction branch pipelines corresponding one-to-one to the air coolers, one end of the starting extraction branch pipeline is connected to the air cooler, and the other end is connected to the starting extraction port; the third valve is arranged on the starting extraction branch pipeline.

6. The air-cooled condenser system according to claim 1, characterized in that: The system also includes a plurality of condensate discharge pipelines corresponding to the air coolers one by one, one end of the condensate discharge pipeline is connected to the condensate pipeline of the air cooler, and the other end constitutes a condensate discharge port; each condensate discharge pipeline is provided with a fourth valve.

7. The air-cooled condenser system according to claim 1, characterized in that: The protective gas is nitrogen.

8. The air-cooled condenser system according to claim 1, characterized in that: Each row of air coolers is equipped with an air pressure detection device for detecting the air pressure inside the air cooler.

9. The antifreeze and antirust method for an air-cooled condenser system according to any one of claims 1 to 8, characterized in that: The steps include: Among the rows of air coolers, at least one row of air coolers is put into operation and recorded as an operating air cooler, and the other air coolers are recorded as disconnected row air coolers for disconnection processing; the disconnection processing of the disconnected row air coolers includes the following steps: S1. Close the steam shut-off valve corresponding to the air cooler to cut off the steam from entering the air cooler; close the second valve corresponding to the air cooler; and cut off the condensate pipeline corresponding to the air cooler; S2. Open the first valve corresponding to the column air cooler; pass the protective gas provided by the gas source into the column air cooler; and open the drain valve of the column air cooler; when the air pressure in the column air cooler reaches the set value, close the drain valve corresponding to the column air cooler, and keep the air pressure in the column air cooler at the set value.

10. The antifreeze and antirust method according to claim 9, characterized in that: When the disconnected air cooler needs to be put into operation again, the following steps are included: S3, close the first valve corresponding to the air cooler of the column to be put into operation; open the third valve corresponding to the air cooler of the column to be put into operation; extract air from the air cooler of the column to be put into operation through the extraction port of the steam extractor, and when the pressure in the air cooler of the column to be put into operation drops to the set pressure, close the third valve; S4, close the extraction port of the steam extractor; Open the second valve corresponding to the Qie column air cooler to be put into operation; open the condensate pipeline corresponding to the Qie column air cooler to be put into operation; finally, open the steam shut-off valve corresponding to the Qie column air cooler to be put into operation, and pass steam for operation.

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