Single-machine double-island operation system and method for air cooling unit

Abstract

The invention provides a single-machine double-island operation system and method for an air cooling unit, and belongs to the technical field of thermal power generation. Comprising a first unit, a second unit and an interconnection and intercommunication assembly, the interconnection and intercommunication assembly comprises an air cooling island steam exhaust pipeline connected with steam exhaust devices of the first unit and the second unit at the same time, an air cooling condensation water pipeline connected with condensation water devices of the first unit and the second unit at the same time, and a vacuumizing pipeline connected with vacuumizing devices of the first unit and the second unit at the same time. An air cooling island exhaust steam communicating valve, an air cooling condensed water communicating valve and a vacuumizing communicating valve are respectively arranged on the air cooling island exhaust steam pipeline, the air cooling condensed water pipeline and the vacuumizing pipeline; the first unit and the second unit achieve single-unit double-island operation of the air cooling unit under the synergistic effect of all pipelines and communicating valves in the interconnection and intercommunication assembly. The situation that the backpressure of the air cooling unit is too high can be prevented through single-machine double-island type interconnection and intercommunication of the air cooling unit, and then the safety of the unit is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of thermal power generation technology, and in particular relates to a single-unit dual-island operation system and method for air-cooled units. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Air-cooled turbine units are an important type of unit in thermal power plants, especially suitable for areas with scarce water resources. However, their operating performance is severely constrained by ambient temperature, exhibiting inherent defects. When ambient temperatures rise in summer, the heat exchange efficiency of the air-cooled island drops sharply, causing a rapid increase in back pressure, which can reach over 35 kPa. High back pressure not only reduces the unit's power generation efficiency and increases coal consumption, affecting the grid's peak-shaving capacity and capacity pricing revenue, but also threatens the unit's safety, potentially causing major safety hazards such as turbine last-stage blade flutter.

[0004] Even though existing technologies offer solutions to the problem of excessive back pressure in air-cooled units, most are limited to technical modifications to the air-cooling island itself. For example, they might involve adding peak cooling devices (such as atomizing spray systems) or increasing the heat exchange area to enhance the island's capacity and prevent excessive back pressure. However, these solutions are costly, and their cooling effect remains limited under extreme temperatures. Furthermore, spray systems introduce additional water consumption and water treatment issues. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a single-unit dual-island operation system and method for air-cooled units, which can prevent excessive back pressure in air-cooled units through the interconnection of single-unit dual-island systems, thereby ensuring unit safety.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions: The first aspect of this invention provides a single-unit dual-island operation system for air-cooled units.

[0007] A single-unit dual-island operation system for an air-cooled unit includes: a first unit, a second unit, and an interconnection component; The interconnection components include an air-cooled island exhaust pipe, an air-cooled condensate pipe, and a vacuum pipe; wherein, the air-cooled island exhaust pipe is connected to the exhaust devices of both the first unit and the second unit, the air-cooled condensate pipe is connected to the condensate devices of both the first unit and the second unit, and the vacuum pipe is connected to the vacuum devices of both the first unit and the second unit. Air-cooled island exhaust pipe, air-cooled condensate pipe and vacuum pipe are respectively equipped with air-cooled island exhaust connecting valve, air-cooled condensate connecting valve and vacuum connecting valve; the first unit and the second unit achieve single-unit dual-island operation of air-cooled unit under the coordinated action of each pipe and connecting valve in the interconnection component.

[0008] Furthermore, the vacuum pipeline is equipped with a first vacuum isolation valve and a second vacuum isolation valve, which are located on both sides of the vacuum connecting valve and are respectively close to the vacuum devices of the first unit and the second unit.

[0009] Furthermore, the air-cooled condensate pipeline is equipped with a first air-cooled condensate booster pump and a second air-cooled condensate booster pump, which are located on both sides of the air-cooled condensate connecting valve and close to the condensate devices of the first unit and the second unit, respectively.

[0010] Furthermore, both the first air-cooled condensate booster pump and the second air-cooled condensate booster pump are equipped with bypass valves, which are used to replace the corresponding booster pumps in non-dual-island operation mode.

[0011] Furthermore, the first unit includes a No. 1 low-pressure cylinder, a No. 1 exhaust device, a No. 1 unit air-cooled island, a No. 1 condensate device, and a No. 1 vacuum pumping device, and the second unit includes a No. 2 low-pressure cylinder, a No. 2 exhaust device, a No. 2 unit air-cooled island, a No. 2 condensate device, and a No. 2 vacuum pumping device.

[0012] Furthermore, the No. 1 low-pressure cylinder and the No. 2 low-pressure cylinder are connected to the No. 1 exhaust device and the No. 2 exhaust device respectively through the low-pressure cylinder exhaust pipe.

[0013] Furthermore, the No. 1 exhaust device and the No. 2 exhaust device are connected through the exhaust pipe of the air-cooled island, and exhaust transfer pipes that connect the air-cooled island of Unit 1 and the air-cooled island of Unit 2 are respectively connected to the exhaust pipe of the air-cooled island.

[0014] Furthermore, the air-cooled islands of Unit 1 and Unit 2 are respectively connected to Condensate Unit 1 and Condensate Unit 2 via air-cooled condensate pipes, and Condensate Unit 1 and Condensate Unit 2 are connected via air-cooled condensate pipes.

[0015] The second aspect of the present invention provides a method for single-unit dual-island operation of an air-cooled unit.

[0016] A method for operating a single-unit dual-island air-cooled chiller includes: When the first unit is running and the second unit is shut down, open the exhaust valve of the air-cooled island, the air-cooled condensate connecting valve, the vacuum connecting valve, and the first vacuum isolation valve, and start the first air-cooled condensate booster pump. Close the second vacuum isolation valve and the second vacuum condensate booster pump; The exhaust steam from the first unit is diverted through the exhaust steam pipe of the air-cooled island to the air-cooled islands of Unit 1 and Unit 2 for cooling; the cooled condensate is collected through the air-cooled condensate pipe and sent back to the No. 1 condensate unit through the first air-cooled condensate booster pump. Vacuum pumping device No. 1 is used to simultaneously pump vacuum from the air-cooled islands of Unit 1 and Unit 2 through vacuum pumping pipes.

[0017] Furthermore, a method for operating a single-unit dual-island air-cooled chiller also includes: When the second unit is running and the first unit is shut down, open the exhaust valve of the air-cooled island, the air-cooled condensate connecting valve, the vacuum connecting valve, and the second vacuum isolation valve, and start the second air-cooled condensate booster pump. Close the first vacuum isolation valve and the first air condensate booster pump; The exhaust steam from the second unit is diverted through the exhaust steam pipe of the air-cooled island to the air-cooled islands of the No. 2 and No. 1 units for cooling; the cooled condensate is collected through the air-cooled condensate pipe and sent back to the No. 2 condensate unit through the second air-cooled condensate booster pump. Vacuum pumping device No. 2 was used to simultaneously pump vacuum from the air-cooled islands of Unit 1 and Unit 2 through the vacuum pumping pipeline.

[0018] The above one or more technical solutions have the following beneficial effects: This invention utilizes idle units and solves the problem of excessive back pressure in air-cooled units through an interconnected design. It optimizes the connection of two sets of air-cooled islands using pipelines and valve control, eliminating the need for large-scale modifications or replacements to the air-cooled islands themselves, thus offering better economic efficiency and feasibility. By guiding the exhaust steam from the operating unit to the air-cooled islands of the two units (i.e., the "dual islands") for coordinated cooling, the effective heat dissipation area and cooling airflow are effectively doubled. This fundamentally increases the overall cooling capacity of the entire unit at the system level, thereby continuously and stably reducing the operating back pressure to a lower level. This allows for effective handling of extreme high-temperature weather without the need for other resources (such as water).

[0019] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1This is a structural diagram of a single-unit dual-island operation system for an air-cooled unit according to Embodiment 1 of the present invention. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0024] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0025] Example 1 This embodiment discloses a single-unit dual-island operation system for air-cooled units.

[0026] A single-unit dual-island operation system for an air-cooled unit includes: a first unit, a second unit, and an interconnection component; The interconnection components include an air-cooled island exhaust pipe, an air-cooled condensate pipe, and a vacuum pipe; wherein, the air-cooled island exhaust pipe is connected to the exhaust devices of both the first unit and the second unit, the air-cooled condensate pipe is connected to the condensate devices of both the first unit and the second unit, and the vacuum pipe is connected to the vacuum devices of both the first unit and the second unit. Air-cooled island exhaust pipe, air-cooled condensate pipe and vacuum pipe are respectively equipped with air-cooled island exhaust connecting valve, air-cooled condensate connecting valve and vacuum connecting valve; the first unit and the second unit achieve single-unit dual-island operation of air-cooled unit under the coordinated action of each pipe and connecting valve in the interconnection component.

[0027] Based on the above systematic design, this invention can prevent excessive back pressure in air-cooled units through the interconnection of single-unit dual-island configurations, thereby ensuring unit safety. To facilitate understanding of the technical solution of this invention, the specific implementation methods are further explained and described below.

[0028] A single-unit dual-island operation system for air-cooled units includes: a first unit (i.e., Unit 1), a second unit (i.e., Unit 2), and interconnection components.

[0029] The first unit includes a No. 1 low-pressure cylinder, a No. 1 exhaust system, a No. 1 air-cooled island, a No. 1 condensate system, and a No. 1 vacuum system. The second unit includes a No. 2 low-pressure cylinder, a No. 2 exhaust system, a No. 2 air-cooled island, a No. 2 condensate system, and a No. 2 vacuum system.

[0030] like Figure 1 As shown, low-pressure cylinders No. 1 and No. 2 are connected to exhaust devices No. 1 and No. 2 respectively via low-pressure cylinder exhaust pipes. Exhaust devices No. 1 and No. 2 are connected via exhaust pipes of the air-cooled island, and exhaust transfer pipes connecting to the air-cooled islands of Unit 1 and Unit 2 are connected to the exhaust pipes of the air-cooled island.

[0031] The air-cooled islands of Unit 1 and Unit 2 are connected to the No. 1 condensate unit and the No. 2 condensate unit respectively via air-cooled condensate pipes. The No. 1 condensate unit and the No. 2 condensate unit are connected via air-cooled condensate pipes.

[0032] like Figure 1 As shown, the interconnection components include an air-cooled island exhaust pipe, an air-cooled condensate pipe, and a vacuum pipe, thus forming a complete system capable of interconnecting a single unit with two islands. Specifically, the air-cooled island exhaust pipe connects to the exhaust systems of both the first and second units; the air-cooled condensate pipe connects to the condensate systems of both units; and the vacuum pipe connects to the vacuum systems of both units. Furthermore, air-cooled island exhaust valves, air-cooled condensate valves, and vacuum pipes are respectively equipped with vacuum connecting valves.

[0033] The vacuum pipeline is equipped with a first vacuum isolation valve and a second vacuum isolation valve. These valves are located on either side of the vacuum connecting valve and are close to the vacuum devices of the first and second units, respectively, thus ensuring the vacuum tightness of the entire interconnected system during operation. In this embodiment, the vacuum device is a vacuum pump; that is, the vacuum devices of the first and second units correspond to the vacuum pumps of Unit 1 and Unit 2, respectively.

[0034] The air-cooled condensate condensate pipeline is equipped with a first air-cooled condensate booster pump and a second air-cooled condensate booster pump. These two pumps are located on either side of the air-cooled condensate connecting valve, and are respectively close to the condensate devices of the first and second units. Thus, it is equivalent to two independent subsystems operating on either side of the air-cooled condensate connecting valve, respectively achieving condensate connection and positive pressure steam injection via pumps, i.e., pumping steam from one exhaust device to the other.

[0035] Both the first and second air-cooled condensate booster pumps are equipped with bypass valves, namely the bypass valve for air-cooled condensate booster pump No. 1 and the bypass valve for air-cooled condensate booster pump No. 2, which can replace the corresponding booster pumps in non-dual-island operation mode.

[0036] Based on the above systematic design, taking the shutdown of Unit 2 and operation of Unit 1 during hot summer weather as an example, the working logic of the single-unit dual-island operation system of the air-cooled unit is as follows: After opening the exhaust valve, condensate water connection valve, vacuum connection valve, vacuum isolation valve No. 1, condensate water booster pump No. 1, and condensate water booster pump No. 2 bypass valves, the vacuum isolation valve No. 2, the condensate water booster pump No. 1 bypass valve, and the condensate water booster pump No. 2 can be closed. At this time, the exhaust steam from the turbine of Unit 1 enters the exhaust device No. 1 after being processed by the low-pressure cylinder of Unit 1, and then enters the air-cooled islands of Unit 1 and Unit 2 respectively through the exhaust pipes of the air-cooled island; then, the condensate water enters the exhaust device No. 2 and is pumped back to the exhaust device of Unit 1 by the condensate water booster pump; then, it returns to the condensate water device No. 1. The vacuum system simultaneously achieves vacuuming of both air-cooled islands through the vacuum pump of Unit 1 and the vacuum connection valve. Correspondingly, when Unit 1 is shut down, Unit 2 can also use this system to achieve single-unit dual-island operation and reduce the unit's back pressure.

[0037] Example 2 This embodiment discloses a method for single-unit dual-island operation of an air-cooled unit.

[0038] A method for operating a single-unit dual-island air-cooled chiller includes: When the first unit is running and the second unit is shut down, open the exhaust valve of the air-cooled island, the air-cooled condensate connecting valve, the vacuum connecting valve, and the first vacuum isolation valve, and start the first air-cooled condensate booster pump. Close the second vacuum isolation valve and the second vacuum condensate booster pump; The exhaust steam from the first unit is diverted through the exhaust steam pipe of the air-cooled island to the air-cooled islands of Unit 1 and Unit 2 for cooling; the cooled condensate is collected through the air-cooled condensate pipe and sent back to the No. 1 condensate unit through the first air-cooled condensate booster pump. Vacuum pumping device No. 1 is used to simultaneously pump vacuum from the air-cooled islands of Unit 1 and Unit 2 through vacuum pumping pipes.

[0039] Furthermore, when the second unit is running and the first unit is shut down, the exhaust valve of the air-cooled island, the air-cooled condensate connecting valve, the vacuum connecting valve, and the second vacuum isolation valve are opened, and the second air-cooled condensate booster pump is started. Close the first vacuum isolation valve and the first air condensate booster pump; The exhaust steam from the second unit is diverted through the exhaust steam pipe of the air-cooled island to the air-cooled islands of the No. 2 and No. 1 units for cooling; the cooled condensate is collected through the air-cooled condensate pipe and sent back to the No. 2 condensate unit through the second air-cooled condensate booster pump. Vacuum pumping device No. 2 was used to simultaneously pump vacuum from the air-cooled islands of Unit 1 and Unit 2 through the vacuum pumping pipeline.

[0040] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. An air-cooled unit single-machine double-island operation system, characterized in that, The utility model relates to a kind of air cooling unit interconnection systems, including: First unit, second unit and interconnection component; The interconnection component includes air cooling island exhaust pipe, air cooling condensate pipe and vacuumizing pipe;Wherein, the air cooling island exhaust pipe is connected with the exhaust device of first unit and second unit simultaneously, the air cooling condensate pipe is connected with the condensate device of first unit and second unit simultaneously, and the vacuumizing pipe is connected with the vacuumizing device of first unit and second unit simultaneously; Air cooling island exhaust communication valve, air cooling condensate communication valve and vacuumizing communication valve are respectively arranged on the air cooling island exhaust pipe, air cooling condensate pipe and vacuumizing pipe;The first unit and second unit realize air cooling unit single machine double island operation under the synergistic effect of each pipe and communication valve in interconnection component.

2. The single-unit double-island operation system of an air-cooled unit according to claim 1, characterized in that, First vacuumizing isolation valve and second vacuumizing isolation valve are arranged on the vacuumizing pipe, and the first vacuumizing isolation valve and second vacuumizing isolation valve are on the two sides of vacuumizing communication valve and are close to the vacuumizing device of first unit and second unit respectively.

3. The single-unit double-island operation system of an air-cooled unit according to claim 1, characterized in that, First air cooling condensate booster pump and second air cooling condensate booster pump are arranged on the air cooling condensate pipe, and the first air cooling condensate booster pump and second air cooling condensate booster pump are on the two sides of air cooling condensate communication valve and are close to the condensate device of first unit and second unit respectively.

4. The single-unit double-island operation system of the air-cooled unit according to claim 3, characterized in that, The first air cooling condensate booster pump and second air cooling condensate booster pump are each provided with bypass valve, for replacing corresponding booster pump in non-double island operation mode.

5. The single-unit double-island operation system of an air-cooled unit according to claim 1, characterized in that, The first unit includes No. 1 low-pressure cylinder, No. 1 exhaust device, No. 1 unit air cooling island, No. 1 condensate device and No. 1 vacuumizing device, and the second unit includes No. 2 low-pressure cylinder, No. 2 exhaust device, No. 2 unit air cooling island, No. 2 condensate device and No. 2 vacuumizing device.

6. The single-unit double-island operation system of the air-cooled unit according to claim 5, characterized in that, The No. 1 low-pressure cylinder and No. 2 low-pressure cylinder are connected with No. 1 exhaust device and No. 2 exhaust device respectively through low-pressure cylinder exhaust pipe.

7. The single-unit double-island operation system of the air-cooled unit according to claim 5, characterized in that, The No. 1 exhaust device and No. 2 exhaust device are connected through air cooling island exhaust pipe, and exhaust diversion pipe connected with No. 1 unit air cooling island and No. 2 unit air cooling island is communicated on the air cooling island exhaust pipe.

8. The single-unit double-island operation system of the air-cooled unit according to claim 5, characterized in that, The No. 1 unit air cooling island and No. 2 unit air cooling island are connected with No. 1 condensate device and No. 2 condensate device respectively through air cooling condensate pipe, and the No. 1 condensate device and No. 2 condensate device are communicated through air cooling condensate pipe.

9. A method for single-unit double-island operation of an air-cooled unit, used in the single-unit double-island operation system according to any one of claims 1 to 8, characterized in that, Including: When first unit operates and second unit stops, open air cooling island exhaust communication valve, air cooling condensate communication valve, vacuumizing communication valve, first vacuumizing isolation valve, and start first air cooling condensate booster pump; Close second vacuumizing isolation valve and second air cooling condensate booster pump; Divert the exhaust of first unit to No. 1 unit air cooling island and No. 2 unit air cooling island for cooling through air cooling island exhaust pipe;Condensate after cooling is collected through air cooling condensate pipe, and is sent back to No. 1 condensate device through first air cooling condensate booster pump; Use No. 1 vacuumizing device to simultaneously perform vacuumizing operation on No. 1 unit air cooling island and No. 2 unit air cooling island through vacuumizing pipe.

10. The single-unit double-island operation method of a dry cooling unit according to claim 9, wherein Also including: When the second unit is running and the first unit is shut down, open the air cooling island exhaust communication valve, the air cooling condensate communication valve, the vacuum pumping communication valve, the second vacuum pumping isolation valve, and start the second air cooling condensate booster pump; Close the first vacuum pumping isolation valve and the first air cooling condensate booster pump; Divert the exhaust steam of the second unit to the air cooling island exhaust pipeline to the air cooling island of the No. 2 unit and the air cooling island of the No. 1 unit for cooling; the cooled condensate is collected through the air cooling condensate pipeline and sent back to the No. 2 condensate device through the second air cooling condensate booster pump; Use the No. 2 vacuum pumping device to simultaneously perform vacuum pumping operation on the air cooling island of the No. 1 unit and the air cooling island of the No. 2 unit through the vacuum pumping pipeline.

Images