45results about How to "Ensure long-term safe operation" patented technology

The invention discloses a method for controlling the alkali-aggregate reaction deformation of high arch dam concrete, simulating the expansion deformation of arch dam concrete alkali-aggregate reaction: predicting the expansion deformation value that may be caused by the alkali-aggregate reaction of arch dam concrete, and adopting the overall temperature rise of the dam body Simulate the alkali-aggregate reaction expansion deformation of arch dam concrete by using the method; analyze the impact of alkali-aggregate reaction expansion deformation on the long-term safety of arch dams. Aiming at the alkali-aggregate reaction problem of high arch dams, the present invention establishes an analysis method considering the influence of alkali-aggregate reaction expansion and deformation on the long-term safety of arch dams, and proposes a control index for allowing alkali-aggregate reaction expansion and deformation of dam concrete, and inhibiting concrete Alkali-aggregate reaction has adverse effects on the dam, and then a set of high arch dam concrete alkali-aggregate reaction deformation control technology has been established, which has achieved a technological breakthrough in the combination of concrete alkali-aggregate reaction and arch dam structure design. It is of great significance to ensure the long-term safe operation of high arch dams.

The invention discloses a scour protection structure for an offshore wind and power foundation single pile. The scour protection structure comprises bottom-layer sand, second-layer sand, third-layer sand, top-layer sand and a plurality of sand bags, and inner layers are arranged on the upper surfaces of the bottom-layer sand, the second-layer sand, the third-layer sand and the top-layer sand. Thebottom-layer sand is in a circular ring shape, the inner diameter of the bottom-layer sand is matched with the outer diameter of the bottom of the foundation single pile, and the outer diameter is larger than the inner diameter by 5 cm. The second-layer sand is also in a circular ring shape, the inner diameter of the second-layer sand is matched with the outer diameter of the bottom of the foundation single pile, and the outer diameter is larger than the inner diameter by 10 cm. The third-layer sand is in a rectangular shape and is formed by two pieces of small rectangular sand, wherein each of the middle portions of the opposite sides of the two pieces of small rectangular sand is provided with a kidney-shaped notch, and a circular hole is formed in the center after the two pieces of small rectangular sand are encircled to the bottom of the foundation single pile. The top-layer sand and the second-layer sand are the same in shape and specification. The sand bags are thrown to the top-layer sand in a filling manner along the foundation single pile. According to the scour protection structure, stability of the seabed around the foundation single pile can be better protected.

The invention relates to a device and a method for the on-line monitoring of the transient-state low-cycle fatigue life loss of a pressure-containing member outside a utility boiler. The device comprises a transient-state low-cycle fatigue life loss compute server, wherein the transient-state low-cycle fatigue life loss compute server is connected with a utility boiler decentralized control device through a factory-level monitoring information device. The method comprises the following steps: reading the data of the on-line measuring points of the utility boiler; calculating the heat stress and the mechanical stress of a pressure-containing member outside the utility boiler; calculating the stress intensity of the pressure-containing member outside the utility boiler; calculating the low-cycle fatigue strain amplitude of the pressure-containing member outside the utility boiler; calculating the low-cycle fatigue life of the pressure-containing member outside the utility boiler; determining the maximum transient-state low-cycle fatigue life loss of the pressure-containing member outside the utility boiler; determining the threshold value of the transient-state low-cycle fatigue life loss; and controlling the transient-state low-cycle fatigue life loss of the pressure-containing member outside the utility boiler. The invention realizes the on-line calculation and control of the transient-state low-cycle fatigue life loss of the pressure-containing member outside the utility boiler.

The invention discloses a microalloyed 35Cr45NiNb alloy steel for ethylene cracking furnace tubes, which contains C: 0.40-0.50, Si: 1.20-1.80, Mn: 0.60-1.20, P: 0.001-0.020, S: 0.001 in mass percent ~0.010, Cr: 35~36, Ni: 45~46, Nb: 0.80~1.50, W: 0.005~0.20, Mo: 0.005~0.20, Cu: 0.005~0.30, Al: 0.005~0.20, Ti: 0.05~0.10 , Zr: 0.05-0.10, B: 0.0010-0.0050, As: 0-0.0020, Sn: 0-0.0020, Pb: 0-0.0020, Bi: 0-0.0001, and the balance is Fe. The alloy steel requires columnar grains to account for more than 70% of the wall thickness, and the grain size grade is 5-6. The invention can effectively improve the high-temperature durability performance of the ethylene cracking furnace tube, so that it meets the requirement of a high-temperature durable fracture time greater than 100 hours under the conditions of 1100°C and 17 MPa, thereby achieving the purpose of ensuring long-term safe operation of the ethylene cracking furnace device.