A marine air extraction system

Abstract

This invention discloses a marine vacuum system, comprising a pressure sensor, a first section of shaft seal vacuum pipeline, a pressure reducing valve, a second section of shaft seal vacuum pipeline, a condenser vacuum pipeline, and a vacuum ejector. The first section of shaft seal vacuum pipeline is connected to the second section of shaft seal vacuum pipeline via the pressure reducing valve. The second section of vacuum pipeline and the condenser vacuum pipeline are connected to the vacuum ejector. The pressure sensor is installed on the first section of shaft seal vacuum pipeline to detect the pressure in the turbine vacuum pipeline and controls the pressure reducing valve via an actuator. The pressure sensor, in conjunction with the pressure reducing valve, achieves pressure control in the turbine vacuum pipeline, thus forming a marine vacuum system that achieves both steam seal vacuum and condenser vacuum using a single vacuum ejector. This new system can reduce the number of pipelines, achieve pipeline merging, and improve system flexibility.

Description

Technical Field

[0001] This invention belongs to the field of marine vacuum systems, and in particular a novel marine vacuum system that achieves vapor sealing vacuum and condenser vacuum using a single vapor ejector. Background Technology

[0002] Traditional cabin ventilation system layout, such as Figure 1 As shown. A traditional cabin air extraction system consists of a turbine shaft seal air extraction pipeline 10, a steam seal ejector 11, a condenser air extraction pipeline 12, and a condenser ejector 13.

[0003] The shaft seal extraction pipeline 10 connects the extraction chamber of the steam seal with the steam seal ejector 11, and is used to isolate the residual steam leaking inside the turbine shaft seal and the leaked air from the unit's interior and the external atmosphere.

[0004] The condenser extraction line 12 connects the condenser extraction port and the condenser extractor 13, and is used to remove the non-condensable gas accumulated inside the condenser to achieve a vacuum inside the condenser.

[0005] Space inside the ship is limited, and piping occupies a significant portion of that space. In traditional piping layouts, a single ejector requires at least a cooling water inlet pipe, a cooling water outlet pipe, a working steam inlet pipe, a drain pipe, an extraction pipe, and a venting pipe. These pipes are numerous, and some have large diameters, thus occupying a considerable amount of space within the ship.

[0006] While existing combined ejectors simply integrate two types of ejectors, merging some pipelines such as cooling water inlet / outlet pipes and working steam pipes, the number of pipes remains relatively large. For example, if a separate steam ejector is used, it requires separate ejection pipes and working steam pipes.

[0007] Existing related patent technologies, such as the novel shaft seal extraction system for small steam turbines in thermal power plants disclosed in patent document (CN205714311U), still involve a large number of pipes and complex layout. Although it is somewhat simplified compared to traditional shaft seal heater systems, it still requires multiple independent pipelines: working steam pipeline (inlet steam pipeline → electric regulating valve → pressure reducing and stabilizing valve → steam ejector), shaft seal leakage pipeline (shaft seal → check valve I → shut-off valve I → steam ejector), mixed exhaust pipeline (steam ejector → shut-off valve II → exhaust pipeline), and bypass pipeline (shut-off valve installed beside the electric regulating valve). These pipelines need to be laid independently, increasing the difficulty of on-site installation and space occupation, and are prone to interference with other pipelines in confined generator room environments. Although a pressure reducing and stabilizing valve is installed, when the steam inlet pressure of the small steam turbine fluctuates within the range of 0.6~3.9MPa, the adjustment accuracy and dynamic response of the pressure reducing valve are difficult to completely eliminate pressure pulsation; the pressure fluctuation is transmitted to the nozzle of the steam ejector, causing the suction negative pressure to fluctuate outside the target range of 4~12kPa, affecting the efficiency of shaft seal leakage recovery. Summary of the Invention

[0008] This invention proposes a novel marine vacuum system that achieves both vapor sealing vacuum and condenser vacuum using a single vapor ejector. This new system can reduce the number of pipelines, merge pipelines, and improve system flexibility.

[0009] To achieve the above objectives, the technical solution of the present invention is: a marine air extraction system, comprising a pressure sensor, a first section of a shaft seal air extraction pipeline, a pressure reducing valve, a second section of a shaft seal air extraction pipeline, a condenser air extraction pipeline, and an air ejector. The first section of the shaft seal air extraction pipeline is connected to the second section of the shaft seal air extraction pipeline via the pressure reducing valve. The second section of the air extraction pipeline and the condenser air extraction pipeline are connected to the air ejector. The pressure sensor is installed on the first section of the shaft seal air extraction pipeline to detect the pressure of the turbine air extraction pipeline and controls the pressure reducing valve via an actuator. The pressure sensor, in conjunction with the pressure reducing valve, achieves pressure control of the turbine air extraction pipeline pressure, thus constituting a marine air extraction system that achieves steam seal vacuum and condenser vacuum using a single air ejector.

[0010] Furthermore, the first section of the shaft seal extraction pipeline connects the extraction chamber of the steam seal with the pressure reducing valve.

[0011] Furthermore, the ejector isolates the internal components of the turbine from the external atmosphere by using a pressure reducing valve and the first section of the shaft seal ejection pipeline to remove residual steam leaking from the turbine shaft seal and any leaked air.

[0012] Furthermore, the vacuum pump removes the non-condensable gases accumulated inside the condenser through the condenser's vacuum pipe, thus achieving a vacuum inside the condenser.

[0013] Furthermore, the pressure reducing valve changes the pressure ratio by controlling its valve position through an actuator.

[0014] Furthermore, the pressure reducing valve has an inlet pressure at the shaft seal extraction port, which is a slightly negative pressure, and an outlet pressure at the condenser extraction port, resulting in a high vacuum.

[0015] Furthermore, when the pressure in the turbine extraction pipeline is too high, the actuator controls the pressure reducing valve to reduce the pressure reduction ratio, thereby lowering the pressure in the turbine extraction pipeline.

[0016] Furthermore, when the pressure in the turbine extraction pipeline is high, the actuator pressure reducing valve will increase the pressure reduction ratio, causing the pressure in the turbine extraction pipeline to rise.

[0017] Furthermore, after the steam flows out of the pressure reducing valve, it enters the condenser extraction pipeline through the second section of the shaft seal extraction pipeline and finally connects to the extraction port of the ejector.

[0018] Furthermore, in use, first install the ejector and pressure reducing valve, then connect the turbine, pressure reducing valve, condenser and ejector to each other using the first section of the shaft seal ejector pipeline, the second section of the shaft seal ejector pipeline and the condenser ejector pipeline, and finally install the pressure sensor on the first section of the shaft seal ejector pipeline.

[0019] Compared with the prior art, the present invention has the following significant advantages:

[0020] 1. The use of the new air extraction system has greatly reduced the number of system pipes, thus reducing the space occupied in the ship's cabin.

[0021] 2. The turbine and condenser are generally closely connected. If the pressure reducing valve is located next to the turbine, the first and second sections of the shaft seal extraction pipeline can be arranged with the unit, and their lengths are relatively short. The pipeline leading from the unit to the ejector consists of two extraction headers merged into one extraction header.

[0022] 3. After the steam seal ejector and condenser ejector (old system) are merged into a single ejector (new system), the cooling water inlet and outlet pipelines, drain pipelines, working steam inlet pipelines, and vent pipelines can all be merged.

[0023] 4. By installing a pressure sensor on the first section of the shaft seal extraction pipeline, the pressure sensor, in conjunction with the pressure reducing valve, enables pressure control of the turbine extraction pipeline, thereby improving the adaptability and effectiveness of the system's extraction. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a traditional cabin air extraction system; Figure 2 This is a schematic diagram of the marine air extraction system of the present invention. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] like Figure 2 As shown in the figure, this embodiment of the invention provides a marine vacuum system that achieves both steam seal vacuum and condenser vacuum using a single steam ejector. The system consists of a pressure sensor 1, a first section 2 of the shaft seal vacuum pipeline, a pressure reducing valve 3, a second section 4 of the shaft seal vacuum pipeline, a condenser vacuum pipeline 5, and an ejector 6.

[0027] The first section 2 of the shaft seal extraction pipeline connects the extraction chamber of the steam seal to the pressure reducing valve 3. The pressure reducing valve 3 connects to the condenser extraction pipeline 5 via the second section 4 of the shaft seal extraction pipeline. The condenser extraction pipeline 5 connects to the condenser extraction port and the ejector 6. The ejector 6, through the pressure reducing valve 3 and the first section 2 of the shaft seal extraction pipeline, removes residual steam and leaked air from inside the turbine shaft seal, achieving isolation between the unit's interior and the external atmosphere. The same ejector 6, through the condenser extraction pipeline 5, removes non-condensable gases accumulated inside the condenser, achieving a vacuum inside the condenser.

[0028] Pressure reducing valve 3 has a high pressure reduction ratio, and its position is controlled by an actuator to change the pressure reduction ratio. The inlet pressure of the pressure reducing valve is the shaft seal extraction port pressure, which is generally a slight negative pressure. The outlet pressure is the condenser extraction port pressure, which generally has a high vacuum degree.

[0029] Pressure sensor 1 is installed on the first section 2 of the shaft seal extraction pipeline to detect the pressure in the turbine extraction pipeline and is connected to an actuator. When the pressure in the turbine extraction pipeline is too high, the pressure reducing valve 3 is activated to reduce the pressure reduction ratio, causing the pressure in the turbine extraction pipeline to drop. Conversely, when the pressure in the turbine extraction pipeline is too high, the pressure reducing valve is activated to increase the pressure reduction ratio, causing the pressure in the turbine extraction pipeline to rise. Pressure sensor 1, in conjunction with pressure reducing valve 3, achieves pressure control of the turbine extraction pipeline.

[0030] After the steam flows out of the pressure reducing valve, it enters the condenser extraction pipeline 5 through the second section 4 of the shaft seal extraction pipeline and finally connects to the extraction port of the ejector.

[0031] In use, first install the ejector and pressure reducing valve. Then, connect the turbine, pressure reducing valve, condenser and ejector to each other using the first section of the shaft seal ejector pipeline, the second section of the shaft seal ejector pipeline and the condenser ejector pipeline. Finally, install the pressure sensor on the first section of the shaft seal ejector pipeline to complete the installation.

[0032] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the concept and scope of the present invention. Therefore, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A marine air extraction system, characterized in that: The system includes a pressure sensor, a first section of the shaft seal extraction pipeline, a pressure reducing valve, a second section of the shaft seal extraction pipeline, a condenser extraction pipeline, and an ejector. The first section of the shaft seal extraction pipeline is connected to the second section of the shaft seal extraction pipeline via the pressure reducing valve. The second section of the extraction pipeline and the condenser extraction pipeline are connected to the ejector. The pressure sensor is installed on the first section of the shaft seal extraction pipeline to detect the pressure in the turbine extraction pipeline. It is connected to the pressure reducing valve through an actuator. The pressure sensor, in conjunction with the pressure reducing valve, achieves pressure control of the turbine extraction pipeline, thus forming a marine extraction system that uses a single ejector to achieve vacuum in the steam seal and condenser.

2. The marine air extraction system according to claim 1, characterized in that: The first section of the shaft seal extraction pipeline connects the extraction chamber of the steam seal to the pressure reducing valve.

3. The marine air extraction system according to claim 1, characterized in that: The ejector isolates the internal components of the turbine from the external atmosphere by using a pressure reducing valve and the first section of the shaft seal ejection pipeline to remove residual steam and leaked air from inside the turbine shaft seal.

4. The marine air extraction system according to claim 1, characterized in that: The vacuum pump removes the non-condensable gases accumulated inside the condenser through the condenser's vacuum line, thus creating a vacuum inside the condenser.

5. The marine air extraction system according to claim 1, characterized in that: The pressure reducing valve changes the pressure ratio by controlling the valve position through an actuator.

6. The marine air extraction system according to claim 5, characterized in that: The pressure reducing valve has an inlet pressure at the shaft seal extraction port, which is a slight negative pressure, and an outlet pressure at the condenser extraction port, providing a high vacuum.

7. The marine air extraction system according to claim 6, characterized in that: When the pressure in the turbine extraction pipeline is too high, the actuator controls the pressure reducing valve to reduce the pressure reduction ratio, thereby lowering the pressure in the turbine extraction pipeline.

8. The marine air extraction system according to claim 6, characterized in that: When the pressure in the turbine extraction pipeline is high, the actuator pressure reducing valve will increase the pressure reduction ratio, causing the pressure in the turbine extraction pipeline to rise.

9. The marine air extraction system according to claim 1, characterized in that: After the steam flows out of the pressure reducing valve, it enters the condenser extraction pipeline through the second section of the shaft seal extraction pipeline and finally connects to the extraction port of the ejector.

10. The marine air extraction system according to any one of claims 9, characterized in that: In use, first install the ejector and pressure reducing valve, then connect the turbine, pressure reducing valve, condenser and ejector to each other using the first section of the shaft seal ejection pipeline, the second section of the shaft seal ejection pipeline and the condenser ejection pipeline, and finally install the pressure sensor on the first section of the shaft seal ejection pipeline.

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