【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20191208

1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide.

1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide.

1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide.

The method to reduce moisture loss is dehumidification. Primarily, the nuclear steam turbine is equipped with a steam-water separation reheater to ensure the efficiency and safety of the low-pressure cylinder. Other measures such as controlling humidity, improving the erosion resistance of blades, and optimizing the design of blades. Measures to enhance the erosion resistance of moving blades include welding carbide materials onto the back arc of the inlet side of the blades, chrome plating, local hardening, electric discharge hardening, nitriding, etc

1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide.

Measures to reduce moisture loss: Use effective dehumidification methods. Common methods include: a. An in-stage water capture device composed of a water capture port, a water capture chamber, and a water drainage channel. B. Hollow nozzle with water-absorbing grooves. C. Use a hollow nozzle that sprays steam at the exhaust edge. 2) Improve the erosion resistance of the moving blade itself. Common measures include: A. Using blade materials with high erosion resistance. B. Weld carbide onto the back arc of the air inlet side of the blade. C. Chromium plating on the leaf surface, local high-frequency hardening, electrical discharge strengthening, nitriding, etc.

The method to reduce moisture loss is dehumidification. Primarily, the nuclear steam turbine is equipped with a steam-water separation reheater to ensure the efficiency and safety of the low-pressure cylinder. Other measures include controlling humidity, improving the erosion resistance of blades, and optimizing the design of the blades; these are all ways to enhance the erosion resistance of the moving blades.

1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide. 1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide. 1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide.

1. Generally, it is specified that the humidity of the last-stage blades of a steam turbine should not exceed 12%–15%. 2. A dehumidification device is used, which utilizes the centrifugal force of water droplets to throw them outside the edge of the flow passage, thereby removing the water ； Or hollow blades with water-absorbing grooves, as well as thin vaporization edge static blades to atomize water droplets, can be used. 3. Improve the erosion resistance of the moving blades by performing surface hardening on the back arc on the inlet side of these blades, as well as through spark plasma strengthening, hard chromium plating, brazing, or coating with cemented carbide.