Air cooling unit and air cooling system

Abstract

The utility model provides an air cooling unit and an air cooling system, the air cooling unit comprises a vacuum pump, a steam exhaust device and a plurality of air cooling units, and each air cooling unit comprises an air cooling condenser, a water inlet, a water outlet and an air outlet; the first end of the steam inlet pipeline communicates with an inlet of the air-cooled condenser, the second end is used for being connected with a low-pressure cylinder of the steam turbine, and a steam valve is installed on the steam inlet pipeline; the first end of the air pumping pipeline is communicated with an air outlet of the air-cooled condenser, the second end of the air pumping pipeline is connected with the vacuum pump, and an air pumping isolation valve is installed on the air pumping pipeline; the first end of the condensed water pipeline is communicated with a water outlet of the air-cooled condenser, the second end of the condensed water pipeline is connected with the steam exhaust device, and a condensed water isolating valve is mounted on the condensed water pipeline; at least one air cooling unit further comprises a first communication pipeline which is communicated with the condensation water pipeline and located between the condensation water isolating valve and the air cooling condenser, and a first emptying valve is installed on the first communication pipeline. By the adoption of the air-cooled condenser, the negative pressure environment in the air-cooled condenser can be eliminated, and residual liquid in the air-cooled condenser can be thoroughly removed.

Description

Technical Field

[0001] The utility model relates to the technical field of safety of thermal systems in coal chemical industry, in particular to an air cooling unit and an air cooling system. Background Art

[0002] Due to the relative scarcity of water resources in northwestern my country, most condensers in northern power plants are air-cooled. Due to the cold winters in northern my country, units are subject to load adjustments in winter, and the air-cooled steam inlet varies widely. This is especially true for self-contained power plants such as coal chemical plants, which operate on a heat-to-energy basis. Due to fluctuations in thermal load, unit loads fluctuate frequently. Air-cooled units consist of multiple air-cooled condensers operating in parallel. To ensure safe operation of the units in winter, some isolated trains of air-coolers must be shut down to prevent freezing. When a train of air-cooled condensers is shut down during unit operation, a high negative pressure remains within the condenser after the air, steam, and condensate valves on the pipelines are closed. This prevents the rapid and complete discharge of condensate from the residual steam. Utility Model Content

[0003] In view of this, the present invention provides an air cooling unit and an air cooling system to solve the above technical problems.

[0004] The air cooling unit provided by the utility model includes a vacuum pump, an exhaust device and a plurality of air cooling units, each of which includes:

[0005] An air-to-condenser, the air-to-condenser being provided with an inlet, a water outlet and an air outlet;

[0006] a steam inlet pipe, wherein a first end of the steam inlet pipe is connected to the inlet of the air-cooled condenser, a second end of the steam inlet pipe is used to be connected to the low-pressure cylinder of the steam turbine, and a steam valve is installed on the steam inlet pipe;

[0007] an air extraction pipeline, wherein a first end of the air extraction pipeline is connected to an air outlet of the air-to-condenser, a second end of the air extraction pipeline is connected to the vacuum pump, and an air extraction isolation valve is installed on the air extraction pipeline;

[0008] a condensate pipe, wherein a first end of the condensate pipe is connected to the water outlet of the air-cooled condenser, a second end of the condensate pipe is connected to the steam exhaust device, and a condensate isolation valve is installed on the condensate pipe;

[0009] At least one group of the air cooling units further includes: a first communicating pipe, the first communicating pipe is connected to the condensate pipe and is located between the condensate isolation valve and the air-cooled condenser, and a first vent valve is installed on the first communicating pipe.

[0010] Optionally, at least one group of the air cooling units further comprises:

[0011] A second communicating pipe is connected to the air extraction pipe and is located between the air extraction isolation valve and the air-to-condenser. A second vent valve is installed on the second communicating pipe.

[0012] Optionally, a first thermometer is installed on the condensate pipe.

[0013] Optionally, the air cooling unit further includes:

[0014] a controller, wherein an input end of the controller is communicatively connected to an output end of the first thermometer;

[0015] An alarm, wherein the input end of the alarm is communicatively connected to the output end of the controller.

[0016] Optionally, a second thermometer is installed on the air extraction pipeline, and the second thermometer is located between the air-to-air condenser and the air extraction isolation valve, and the output end of the second thermometer is communicatively connected to the input end of the controller.

[0017] Optionally, a first flow meter is installed on the condensate pipe, and an output end of the first flow meter is communicatively connected to an input end of the controller.

[0018] Optionally, a second flow meter is installed on the air extraction duct, and an output end of the second flow meter is communicatively connected to an input end of the controller.

[0019] Optionally, the first vent valve is configured as a negative pressure needle-type vent valve; and / or,

[0020] The second vent valve is configured as a negative pressure needle-type vent valve.

[0021] The utility model also provides an air cooling system, comprising a steam turbine and any one of the above-mentioned air cooling units, wherein the steam inlet pipe of the air cooling unit is connected to the low-pressure cylinder of the steam turbine.

[0022] Optionally, the air cooling system further includes: a boiler, wherein the boiler is connected to the exhaust device of the air cooling unit.

[0023] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0024] When the air-cooling unit and air-cooling system of the present invention are adopted, a first connecting pipe is connected to the condensate pipe of at least one group of air-cooling units, and when exiting the group of air-cooling units, the first vent valve on the first connecting pipe is opened to connect the pipe with the atmosphere, which can eliminate the negative pressure environment in the air-cooled condenser and completely remove the residual condensate therein, preventing the residual condensate from freezing and clogging the air-cooled condenser, or even freezing and cracking the air-cooling tube bundle therein. Moreover, the air-cooled condenser is maintained at normal pressure, which can prevent the steam or condensate in the pipes of other running air-cooling units from entering the stopped air-cooled condenser due to the pressure difference, and freezing and condensing therein, or even freezing and cracking the internal air-cooling tube bundle, affecting the subsequent use of the air-cooled condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a top view of an air cooling unit according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 1: Vacuum pump; 2: Steam exhaust device; 3: Air cooling unit; 301: Air-cooled condenser; 302: Steam inlet pipe; 303: Air extraction pipe; 304: Condensate pipe; 305: Steam valve; 306: Air extraction isolation valve; 307: Condensate isolation valve; 308: First connecting pipe; 309: First vent valve; 310: Second connecting pipe; 311: Second vent valve; 4: Steam turbine. DETAILED DESCRIPTION

[0028] The embodiments of the present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] Figure 1 This is a top view of an air cooling unit according to an embodiment of the present invention. Figure 1As shown, the air cooling unit includes a vacuum pump 1, an exhaust device 2, and multiple air cooling units 3. Each air cooling unit 3 includes an air condenser 301, a steam inlet pipe 302, an air extraction pipe 303, and a condensate pipe 304. At least one group of air cooling units 3 also includes a first connecting pipe 308. The air-cooled condenser 301 is provided with an inlet, a water outlet and an air outlet; the first end of the steam inlet pipe 302 is communicated with the inlet of the air-cooled condenser 301, the second end of the air inlet pipe is used to be connected to the low-pressure cylinder of the steam turbine 4, and a steam valve 305 is installed on the steam inlet pipe 302; the first end of the air extraction pipe 303 is communicated with the air outlet of the air-cooled condenser 301, the second end of the air extraction pipe 303 is connected to the vacuum pump 1, and an air extraction isolation valve 306 is installed on the air extraction pipe 303; the first end of the condensate pipe 304 is communicated with the water outlet of the air-cooled condenser 301, the second end of the condensate pipe 304 is connected to the exhaust device 2, and a condensate isolation valve 307 is installed on the condensate pipe 304; the first connecting pipe 308 is communicated with the condensate pipe 304, and is located between the condensate isolation valve 307 and the air-cooled condenser 301, and a first vent valve 309 is installed on the first connecting pipe 308.

[0030] When all the air-cooling units 3 are in operation, the steam valve 305, the air extraction isolation valve 306 and the condensate isolation valve 307 of each air-cooling unit 3 are opened, and the exhaust steam transmitted from the low-pressure cylinder of the steam turbine 4 is transmitted to the corresponding air-cooled condenser 301 through each steam inlet pipe 302. After heat exchange inside the air-cooled condenser 301, the gas is discharged through the air outlet to the air extraction pipe 303 and further transported to the vacuum pump 1. The condensate is discharged through the water outlet to the condensate pipe 304 and further transported to the steam exhaust device 2.

[0031] When a group of air-cooling units 3 needs to be exited due to low temperatures in winter, the air-cooling unit 3 where the first connecting pipe 308 is located is selected, and the first vent valve 309 is opened. Since the first connecting pipe 308 is connected to the atmosphere, the negative pressure environment in the air-cooling condenser 301 of the air-cooling unit 3 is destroyed, and the residual condensate inside is completely discharged to the exhaust device 2 through the condensate pipe 304. Then, the condensate isolation valve 307, the air extraction isolation valve 306 and the steam valve 305 of the air-cooling unit 3 are closed, and the group of air-cooling units 3 exits and no longer participates in the steam processing work. After the group of air-cooling units 3 exits, the first vent valve 309 remains open, and the air-cooling condenser 301 of the group of air-cooling units 3 is in a normal pressure state. The steam or condensate in the pipelines of other operating air-cooling units 3 will not be injected into the stopped air-cooling condenser 301 due to the pressure difference when the condensate isolation valve 307 is not closed tightly, and will not be frozen in it, or even the internal air-cooling tube bundle will be cracked, affecting the subsequent use of the air-cooling condenser 301.

[0032] When adopting the air-cooling unit of the present invention, the first connecting pipe 308 is connected to the condensate pipe 304 of at least one group of air-cooling units 3, and when exiting the group of air-cooling units 3, the first vent valve 309 on the first connecting pipe 308 is opened to connect the pipe with the atmosphere, which can eliminate the negative pressure environment in the air-cooling condenser 301 and completely remove the residual condensate therein, preventing the residual condensate from freezing and clogging the air-cooling condenser 301, or even freezing and cracking the air-cooling tube bundle therein. Moreover, the air-cooling condenser 301 maintains a normal pressure state, which can prevent the steam or condensate in the pipes of other running air-cooling units 3 from entering the stopped air-cooling condenser 301 due to the pressure difference, and freezing and condensing therein, or even freezing and cracking the internal air-cooling tube bundle, affecting the subsequent use of the air-cooling condenser 301.

[0033] like Figure 1 As shown, in this embodiment, the air-cooling unit includes three groups of air-cooling units 3. The left end inlet of the air-cooling condenser 301 of the air-cooling unit 3 is connected to the steam inlet pipe 302, and a steam valve 305 is installed on the steam inlet pipe 302. The other end of the steam inlet pipe 302 is connected to the low-pressure cylinder of the turbine 4. The air outlet at the right end of the air-cooling condenser 301 of the air-cooling unit 3 is connected to the air extraction pipe 303, and an air extraction isolation valve 306 is installed on the air extraction pipe 303. The other end of the air extraction pipe 303 is connected to the vacuum pump 1. The air-cooling condenser 301 of the air-cooling unit 3 is provided with two front and rear water outlets, and the two water outlets are respectively connected to the condensate pipe 304, and a condensate isolation valve 307 is installed on the condensate pipe 304. The other end of the condensate pipe 304 is connected to the exhaust device 2. In the topmost and middle air-cooling unit 3, a first connecting pipe 308, which is connected to the atmosphere, is connected to the condensate pipe 304 on the side of the condensate isolation valve 307 near the air-cooled condenser 301. A first vent valve 309 is installed on the first connecting pipe 308. In this embodiment, the steam valve 305, the air extraction isolation valve 306, and the condensate isolation valve 307 all use solenoid valves.

[0034] During the operation of the air cooling unit, in order to avoid shutting down all the air cooling units 3 due to misoperation, which would result in the exhaust steam being unable to enter any air cooling unit 3 for heat exchange, a group of air cooling units 3 can be selected as forced start units, for example Figure 1 For the air-cooling unit 3 at the bottom, if the steam valve 305 on the steam inlet pipe 302, the air extraction isolation valve 306 on the air extraction pipe 303, and the condensate isolation valve 307 on the condensate pipe 304 are cancelled, then this group of air-cooling units 3 is in a normally started state and cannot be selected as the air-cooling unit 3 to be stopped. Therefore, the condensate pipe 304 of this group of air-cooling units 3 does not need to be connected to the first connecting pipe 308.

[0035] Depending on actual application, the number of air cooling units 3 provided can be adjusted, as can the number of air cooling units 3 connected to the first connecting pipe 308 on the condensate pipe 304. This allows one or more groups of air cooling units 3 to be stopped as needed. The exhaust device 2 and vacuum pump 1 can be any commercially available model that meets the requirements for the operation of the air cooling unit.

[0036] Optionally, at least one group of air-cooling units 3 further includes a second connecting pipe 310, which is connected to the air extraction pipe 303 and is located between the air extraction isolation valve 306 and the air-cooling condenser 301. A second vent valve 311 is installed on the second connecting pipe 310. This arrangement, as a supplement to connecting the first connecting pipe 308 to the condensate pipe 304, allows the second connecting pipe 310 to be connected to the atmosphere when the second vent valve 311 is opened. When the air-cooling unit 3 in which it is located stops operating, the negative pressure environment in the corresponding air-cooling condenser 301 is further eliminated, allowing the residual condensate in the air-cooling condenser 301 to be completely discharged, preventing the residual condensate from freezing and clogging or freezing and cracking the air-cooling tube bundle in the air-cooling condenser 301, and preventing the steam or condensate in the pipes of other operating air-cooling units 3 from entering the stopped air-cooling condenser 301 due to the pressure difference, freezing therein, or even freezing and cracking the internal air-cooling tube bundle, affecting the subsequent use of the air-cooling condenser 301.

[0037] Such as Figure 1 As shown, in this embodiment, the air extraction pipes 303 of the topmost and middle air-cooling units 3 are respectively connected to a second connecting pipe 310 between the air extraction isolation valve 306 and the air-cooling condenser 301, and a second vent valve 311 is respectively installed on the second connecting pipe 310. When it is necessary to shut down a group of air-cooling units 3, the air-cooling unit 3 connected to the first connecting pipe 308 and the second connecting pipe 310 is selected, and the first vent valve 309 and the second vent valve 311 are opened, so that both the first connecting pipe 308 and the second connecting pipe 310 are connected to the atmosphere. This eliminates the negative pressure environment in the air-cooling condenser 301, and the residual condensate inside can be smoothly discharged.

[0038] Optionally, a first thermometer (not shown) is installed on the condensate pipe 304. If the cooling medium in the air-cooled condenser 301 flows into the condensate pipe 304, the temperature in the condensate pipe 304 will become lower. The first thermometer is provided to monitor the first temperature data in the condensate pipe 304 in real time, so that the operator can observe the temperature change in real time and determine whether the air-cooling unit 3 is operating abnormally.

[0039] In order to facilitate intuitive observation by the operator, the first thermometer can be a thermometer with a digital display.

[0040] Optionally, the air-cooling unit further includes a controller and an alarm (not shown). The input of the controller is communicatively connected to the output of the first thermometer; the input of the alarm is communicatively connected to the output of the controller. First temperature data monitored by the first thermometer is transmitted to the controller in real time. The controller controls the alarm to sound an alarm when it determines that the first temperature data is abnormal. This allows operators to promptly detect abnormal operation of the air-cooling unit 3 and perform repairs as soon as the abnormality occurs.

[0041] The first thermometer monitors first temperature data within condensate pipe 304 in real time and transmits the first temperature data to a controller. The controller pre-stores a first temperature threshold. When the first temperature data falls below the first temperature threshold, the controller sends an alarm signal to the alarm, causing the alarm to sound an alarm. The alarm may be an audible alarm, a light alarm, or the like. The controller controls the alarm to sound an alarm based on temperature changes using a control logic that can be implemented using existing mature algorithms, and its specific operating principles are not further described here.

[0042] Optionally, a second thermometer (not shown) is installed on the air extraction pipe 303, and the second thermometer is located between the air-cooled condenser 301 and the air extraction isolation valve 306, and the output end of the second thermometer is communicatively connected to the input end of the controller. When a certain air-cooling unit 3 stops operating, the corresponding air extraction isolation valve 306 is closed, and the temperature in the air extraction pipe 303 between the air-cooled condenser 301 and the air extraction isolation valve 306 remains basically stable. If the temperature drops, it indicates that the air extraction isolation valve 306 is not closed tightly, low-temperature air from other pipes has been infiltrated, or there is a problem with the heating system inside the air-cooled condenser 301. Real-time monitoring of the second temperature data in the air extraction pipe 303 facilitates the operator to observe temperature changes in real time and then determine whether the air-cooling unit 3 in which it is located has an abnormal operation.

[0043] When the air cooling unit 3 stops running, the second thermometer is started to monitor the second temperature data in the air exhaust duct 303 in real time, and the second temperature data is transmitted to the controller in real time. The controller has a second temperature threshold pre-stored inside. When the second temperature data is lower than the second temperature threshold, the controller sends an alarm signal to the alarm, causing the alarm to sound an alarm.

[0044] Optionally, a first flow meter (not shown) is installed on the condensate pipe 304, and the output of the first flow meter is communicatively connected to the input of the controller. During normal operation of the air-cooling unit 3, condensate continuously flows through the condensate pipe 304. If the condensate flow rate becomes too small, it indicates that condensate has frozen in the air-cooling condenser 301 and is blocking the pipe, requiring maintenance.

[0045] During normal operation of the air-cooling unit 3, the first flow meter is started to monitor the first flow data flowing through the condensate pipe 304 in real time, and the first flow data is transmitted to the controller in real time. A first flow threshold is pre-stored inside the controller. When the received first flow data is less than the first flow threshold, it indicates that the air-cooled condenser 301 is operating abnormally. At this time, the controller sends an alarm signal to the alarm, causing the alarm to sound an alarm, prompting the operator to carry out timely maintenance.

[0046] Optionally, a second flow meter (not shown) is installed on the air extraction pipe 303, and the output end of the second flow meter is communicatively connected to the input end of the controller. During normal operation of the air cooling unit 3, gas continuously flows through the air extraction pipe 303. If the gas flow rate becomes too small, it indicates that condensate in the air-cooled condenser 301 is frozen and blocking the pipe, requiring maintenance.

[0047] During the normal operation of the air cooling unit 3, the second flow meter is started to monitor the second flow data of the gas flowing through the air extraction duct 303 in real time, and the second flow data is transmitted to the controller in real time. A second flow threshold is pre-stored inside the controller. When the received second flow data is less than the second flow threshold, it indicates that the air condenser 301 is operating abnormally. At this time, the controller sends an alarm signal to the alarm, causing the alarm to sound an alarm, prompting the operator to carry out timely maintenance.

[0048] Optionally, the first vent valve 309 is configured as a negative pressure needle vent valve; and / or the second vent valve 311 is configured as a negative pressure needle vent valve. Negative pressure needle vent valves have excellent sealing performance, strong pressure tolerance, flexible adjustment, and convenient installation, making them easy for operators to quickly install and use for a long time.

[0049] The following examples illustrate the practical application of air cooling units:

[0050] A coal chemical company's steam pipeline network consists of five levels of steam: 9.8, 4.3, 1.6, 1.1, and 0.46 MPa. The 4.3 and 1.1 MPa steam pipelines are supplied by two CCK50 double-extraction, direct air-cooled units, rated at 46 t / h for medium extraction and 150 t / h for low extraction. During unit maintenance and emergency conditions, the 9.8 / 4.3 and 9.8 / 1.1 desuperheaters and pressure reducers are used to supply steam.

[0051] Winter temperatures in the Midong District of Urumqi, Xinjiang, often hover around -25°C with frequent winds of force 3-4. The minimum steam intake for safe operation of a full train of air-cooled units is 160 t / h. Therefore, to ensure normal extraction steam heating and improve the unit's balanced steam load regulation, at least one train must be deactivated during winter operation. Investigations revealed that nearby air-cooled units were unable to fully isolate due to internal leakage in the isolation train valves, and condensate could not be fully drained due to siphoning during the winter isolation process, resulting in freezing. Consequently, all trains maintained safe air-cooled operation. This significantly limited the CC50 units' extraction steam heating capacity and steam load regulation capabilities. After analysis, it was decided to modify the air-cooled isolation trains. Negative pressure needle vent valves were added before the air and condensate isolation valves in the air-cooled isolation trains. This facilitated the siphoning and drainage of residual condensate after isolation, allowing for intuitive verification of the isolation valve's tightness. Deactivating one train of air-cooled units ensured safe operation at 120 t / h of air-cooled steam intake, ensuring safe and economical operation of the units at rated extraction steam conditions during winter.

[0052] Economic calculation:

[0053] (1) Safety benefits: reducing the risk of freezing during winter operation of air-cooled units.

[0054] (2) Economic benefits: During the rated operation of air cooling in winter, the air cooling safe operation steam intake can be reduced from 160t / h to 120t / h, increasing the extraction steam heating load by 40t / h. Otherwise, the high-temperature and high-pressure steam of 9.8MPa and 535℃ needs to be reduced to 4.3MPa and 430℃ or 1.1MPa and 300℃ through the desuperheater and pressure reducer for heating. If the 40t / h steam is fully supplied to the 4.3MPa and 430℃ grade pipeline network, the enthalpy drop is 186KJ / kg. The hourly heat loss is 7,440 MJ. If 40 t / h of steam is supplied entirely to a 1.1 MPa, 300°C pipeline network, the enthalpy drop is 413 kJ / kg, resulting in an hourly heat loss of 16,520 MJ. Conservatively, assuming a 50% extraction rate for both units and 2,000 hours in winter, and 20 t / h of medium and low extraction for each unit, the resulting heat loss savings are: Q = 2*(7,160 + 20,760) / 2*2,000 = 47,920,000 MJ. This translates to 1,635.5 tons of standard coal, which, at 417 yuan per ton, represents a cost savings of 681,800 yuan.

[0055] The present invention further provides an air cooling system, comprising a steam turbine 4 and the air cooling unit described in any of the above embodiments, wherein the steam inlet pipe 302 of the air cooling unit is connected to the low-pressure cylinder of the steam turbine 4 .

[0056] The low pressure cylinder of the steam turbine 4 provides a continuous steam source for the air-cooled condenser 301 .

[0057] When adopting the air cooling system of the present invention, a first connecting pipe 308 is connected to the condensate pipe 304 of at least one group of air cooling units 3, and when exiting the group of air cooling units 3, the first vent valve 309 on the first connecting pipe 308 is opened to connect the pipe with the atmosphere, which can eliminate the negative pressure environment in the air-cooled condenser 301 and completely remove the residual condensate therein, preventing the residual condensate from freezing and clogging the air-cooled condenser 301, or even freezing and cracking the air-cooled tube bundle therein. Moreover, the air-cooled condenser 301 maintains a normal pressure state, which can prevent the steam or condensate in the pipes of other running air-cooling units 3 from entering the stopped air-cooled condenser 301 due to the pressure difference, and freezing and condensing therein, or even freezing and cracking the internal air-cooled tube bundle, affecting the subsequent use of the air-cooled condenser 301.

[0058] Optionally, the air cooling system further includes a boiler (not shown), which is connected to the exhaust device 2 of the air cooling unit.

[0059] The condensate is discharged into the exhaust device 2 through the condensate pipe 304. After being discharged from the exhaust device 2, it is heated by the low-pressure heater and the high-pressure heater and then output to the boiler. It is further heated and vaporized in the boiler and then discharged, providing a source of high-temperature and high-pressure steam for the turbine 4.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An air cooling unit, characterized in that: It includes a vacuum pump, an exhaust device and multiple air cooling units, each of which includes: An air-to-condenser, the air-to-condenser being provided with an inlet, a water outlet and an air outlet; a steam inlet pipe, wherein a first end of the steam inlet pipe is connected to the inlet of the air-cooled condenser, a second end of the steam inlet pipe is used to be connected to the low-pressure cylinder of the steam turbine, and a steam valve is installed on the steam inlet pipe; an air extraction pipeline, wherein a first end of the air extraction pipeline is connected to an air outlet of the air-to-condenser, a second end of the air extraction pipeline is connected to the vacuum pump, and an air extraction isolation valve is installed on the air extraction pipeline; a condensate pipe, wherein a first end of the condensate pipe is connected to the water outlet of the air-cooled condenser, a second end of the condensate pipe is connected to the steam exhaust device, and a condensate isolation valve is installed on the condensate pipe; At least one group of the air cooling units further includes: a first communicating pipe, the first communicating pipe is connected to the condensate pipe and is located between the condensate isolation valve and the air-cooled condenser, and a first vent valve is installed on the first communicating pipe.

2. The air cooling unit according to claim 1, characterized in that: At least one group of the air cooling units further comprises: A second communicating pipe is connected to the air extraction pipe and is located between the air extraction isolation valve and the air-to-condenser. A second vent valve is installed on the second communicating pipe.

3. The air cooling unit according to claim 1 or 2, characterized in that: A first thermometer is installed on the condensate pipe.

4. The air cooling unit according to claim 3, characterized in that: Also includes: a controller, wherein an input end of the controller is communicatively connected to an output end of the first thermometer; An alarm, wherein the input end of the alarm is communicatively connected to the output end of the controller.

5. The air cooling unit according to claim 4, characterized in that: A second thermometer is installed on the air extraction pipeline, and the second thermometer is located between the air-to-air condenser and the air extraction isolation valve, and the output end of the second thermometer is communicatively connected to the input end of the controller.

6. The air cooling unit according to claim 4, characterized in that: A first flow meter is installed on the condensate pipeline, and an output end of the first flow meter is communicatively connected to an input end of the controller.

7. The air cooling unit according to claim 4, characterized in that: A second flow meter is installed on the air extraction pipeline, and the output end of the second flow meter is communicatively connected to the input end of the controller.

8. The air cooling unit according to claim 2, characterized in that: The first vent valve is configured as a negative pressure needle-type vent valve; and / or, The second vent valve is configured as a negative pressure needle-type vent valve.

9. An air cooling system comprising a steam turbine, characterized in that: It also includes the air-cooling unit according to any one of claims 1 to 8, wherein the steam inlet pipe of the air-cooling unit is connected to the low-pressure cylinder of the steam turbine.

10. The air cooling system according to claim 9, characterized in that: Also includes: A boiler is connected to the exhaust device of the air-cooling unit.

Images