A combined integrated air extractor

Abstract

This invention relates to a combined integrated ejector, comprising a two-stage ejector and a steam-sealed ejector, which are integrated into a single unit. The aftercoolers of the two-stage and steam-sealed ejectors are combined into a single chamber, forming a combined integrated ejector with three chambers, one steam inlet, one cooling water inlet / outlet, and one vent pipe. This combined integrated ejector organically combines two independent devices, maintaining their original functions, simplifying the system, reducing overall size, lowering manufacturing costs, and facilitating installation. It also saves cabin space and operator workstations. The reduced system piping lowers pipe resistance and improves turbine operating efficiency. This invention can be used in marine turbine units and can be extended to more civil power plant turbine units or condensing turbine units.

Description

Technical Field

[0001] This invention relates to an ejector for removing non-condensable gases from a steam turbine condenser, maintaining a high vacuum in the condenser, and simultaneously removing leaking steam / gas from the steam turbine sealing system, maintaining a slight negative pressure in the steam turbine sealing ejector system, and preventing steam and air leakage from the turbine end. Background Technology

[0002] Existing steam turbine ejection systems generally consist of two parts: a two-stage ejector and a steam seal ejector. Due to the different vacuum pressure requirements, the two ejectors are designed and installed separately, forming an independent system. The two-stage ejector extracts the non-condensable air-steam mixture from the condenser, maintaining a high vacuum of approximately 20 kPa(a) within the condenser. (See...) Figure 1 The steam seal ejector is used to remove leaking steam / gas from the steam turbine's steam seal system, maintaining a slight negative pressure of approximately 90 kPa(a) in the system. See [link to documentation]. Figure 2 . Summary of the Invention

[0003] To simplify the composition of the turbine extraction system, reduce the size of the turbine ejector, save manufacturing costs, reduce the space occupied in the compartment and the number of personnel operating positions, and facilitate layout and installation, this invention provides a combined integrated ejector.

[0004] To achieve the above objectives, the technical solution of the present invention is: a combined integrated ejector, which consists of a two-stage ejector and a steam-sealed ejector, wherein the two-stage ejector and the steam-sealed ejector are combined and integrated into one unit, wherein the aftercoolers of the two-stage ejector and the steam-sealed ejector are combined into one chamber, forming a combined integrated ejector with three chambers, one steam inlet, one cooling water inlet and outlet, and one exhaust pipe.

[0005] Furthermore, the combined integrated ejector is a steam ejector, and the high-temperature and high-pressure working steam is saturated steam with a pressure of 1.3 MPa(a) to 2.7 MPa(a).

[0006] Furthermore, in the combined integrated ejector, the condenser side of the first-stage ejector is connected to the condenser for extracting air from the condenser and compressing and increasing the pressure. A first-stage cooler is provided between the first and second-stage ejectors to pre-cool the steam-air mixture entering the second-stage ejector and condense a portion of the steam to be discharged from the first-stage shell.

[0007] Furthermore, the second-stage ejector is connected to the second-stage cooler via the second-stage diffuser, which is used to condense the steam in the steam-air mixture from the outlet of the second diffuser into the second-stage cooler and discharge it into the second-stage housing; the non-condensable air is discharged into the atmosphere through the air port of the second-stage housing.

[0008] Furthermore, the outlet pressure of the second-stage diffuser is higher than atmospheric pressure.

[0009] Furthermore, the vapor seal ejector is an ejector that uses a cooling-before-ejection method. The amount of steam and air to be extracted is the amount after cooling. The extracted mixture enters the second-stage cooler of the vacuum ejector for further cooling, and the non-condensable air is discharged into the atmosphere through the air port of the second-stage shell.

[0010] Furthermore, the aftercooler of the combined integrated air ejector uses condensate pumped by a condensate pump as the cooling medium.

[0011] The beneficial effects of this invention are:

[0012] The combined integrated ejector of this invention organically combines two independent devices, maintaining their original functions while simplifying the system, reducing overall size, lowering manufacturing costs, and facilitating installation. It also saves cabin space and operator workstations. The reduced system piping lowers pipe resistance and improves turbine operating efficiency. This invention can be used in marine turbine units and can be extended to more civilian power plant turbine units or condensing turbine units. Attached Figure Description

[0013] Figure 1 A schematic diagram of an existing two-stage air ejector;

[0014] Figure 2 A schematic diagram of an existing steam seal ejector;

[0015] Figure 3 This is a schematic diagram of the combined integrated air ejector of the present invention;

[0016] Figure 4 This is a schematic diagram illustrating the working principle of the combined integrated air extractor of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 3 As shown in Figure 4, the combined integrated ejector of the present invention consists of a two-stage ejector and a steam seal ejector. The two-stage ejector and the steam seal ejector are integrated into one unit. The aftercoolers of the two-stage ejector and the steam seal ejector are combined into one chamber, forming a combined integrated ejector with three chambers, one steam inlet, one cooling water inlet and outlet, and one exhaust pipe.

[0019] The combined integrated vacuum pump of the present invention combines the original two-stage vacuum pump and the vapor seal vacuum pump into one, while maintaining the two vacuum pressure functions. The original design required 4 chambers, which are now integrated into 3 chambers. The external interface is integrated, and the performance is fully matched. The combined integrated vacuum pump has a different external structure.

[0020] The two-stage ejector and the steam-sealed ejector have different suction pressure requirements, but their performance requirements remain independent. Both have positive pressure aftercoolers with essentially the same pressure, and are combined into a single chamber. The working steam, previously supplied from two separate lines, is now supplied from one. The cooling water in the combined chamber, previously supplied from two separate lines, now shares a single inlet and outlet. The two vent pipes are combined into one. The two previously separate, independent systems are now integrated into a single system.

[0021] The combined integrated ejector of the present invention can be used in various types of marine steam turbine units, with excellent performance and fully meeting the requirements of the unit.

[0022] The combined integrated ejector of this invention is a steam ejector. Its working principle involves using high-temperature, high-pressure working steam, typically saturated steam at 1.3 MPa(a) to 2.7 MPa(a), which expands through a working nozzle to the mixing chamber at the pressure required by the equipment. This generates a high-speed airflow, which carries the steam-air mixture extracted from the equipment into a diffuser. The velocity decreases continuously while the pressure gradually increases. At the diffuser outlet, the pressure of the steam-air mixture rises to above atmospheric pressure, where it is cooled in an aftercooler, and the extracted air is discharged into the atmosphere.

[0023] The working principle of the combined integrated ejector of this invention is as follows: In the first-stage ejector on the condenser side, air is extracted from the condenser and compressed to an intermediate pressure that is higher than the condenser pressure but lower than atmospheric pressure. Between the two ejectors is a first-stage cooler to pre-cool the steam-air mixture entering the second-stage ejector. When the mixture is cooled in the first-stage cooler, a portion of the steam condenses and exits the first-stage shell. The uncondensed steam-air mixture enters the second stage. The second-stage ejector operates on the same principle as the first stage, but the outlet pressure of the second-stage diffuser is slightly higher than atmospheric pressure. The steam-air mixture exiting the diffuser passes through the second-stage cooler, causing the steam in the mixture to condense and exit the second-stage shell. The uncondensed air is discharged into the atmosphere through the air duct of the second-stage shell.

[0024] The steam-sealed ejector adopts the principle of cooling before extraction. The amount of steam and air to be extracted is the amount after cooling. The extracted mixture then enters the second-stage cooler of the vacuum ejector for further cooling. The non-condensable air is discharged into the atmosphere through the air port of the second-stage shell.

[0025] The aftercooler of the integrated ejector can use condensate pumped by a condensate pump as the cooling medium. This allows the heat from the working steam of the ejector to be carried back to the feedwater system by the condensate, improving the system's economy. (Working principle diagram) Figure 4 .

Claims

1. A combined integrated air ejector, characterized in that: The system comprises a two-stage ejector and a steam-sealed ejector, which are integrated into a single unit. The aftercoolers of the two-stage ejector and the steam-sealed ejector are combined into a single chamber, forming an integrated ejector with three chambers, one steam inlet, one cooling water inlet / outlet, and one exhaust pipe. In this integrated ejector, the condenser side of the first-stage ejector is connected to a condenser to extract air from the condenser and compress and increase its pressure. A first-stage cooler is located between the first and second-stage ejectors to pre-cool the steam-air mixture entering the second-stage ejector and condense a portion of the steam before it is discharged from the first-stage shell. The second-stage ejector is connected to the second-stage cooler via a second-stage diffuser, allowing the steam-air mixture exiting the second-stage diffuser to condense the steam in the mixture before it is discharged from the second-stage shell. Non-condensable air is discharged into the atmosphere through the air inlet of the second-stage shell. The outlet pressure of the second-stage diffuser is higher than atmospheric pressure.

2. The combined integrated air extractor according to claim 1, characterized in that: The combined integrated ejector is a steam ejector, and the high-temperature and high-pressure working steam is saturated steam with a pressure of 1.3 MPa(a) to 2.7 MPa(a).

3. The combined integrated air extractor according to claim 1, characterized in that: The vapor seal ejector is an ejector that uses a cooling-before-ejection method. The amount of steam and air to be extracted is the amount after cooling. The extracted mixture enters the second-stage cooler of the vacuum ejector for further cooling, and the non-condensable air is discharged into the atmosphere through the air port of the second-stage shell.

4. The combined integrated air extractor according to claim 1, characterized in that: The aftercooler of the combined integrated air ejector uses condensate pumped by a condensate pump as the cooling medium.

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