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 relates to an intelligent adjustable and flexible sealing system for a rotary type air pre-heater used in a large and medium-sized thermal power generating unit. The sealing system comprises an adjustable and flexible sealing piece, a nonadjustable sector plate, a casing curved plate, a sealing piece guide groove, a sealing piece push-pull rod, a push-pull rod sealing component, a straight stroke actuating mechanism, a digital position sensor, a temperature sensor, a contact-type sonic sensor and an industrial PC (personal computer) provided with an I / O (input / output) connector. The quality of the adjustable and flexible sealing piece accounts for 1% or less of that of the nonadjustable sector plate, the controllability is good, and the actuating mechanism is light in weight, intelligent and low in energy consumption; the application is expanded to cold side radial sealing and axial sealing, the air leakage rate of the rotary type air pre-heater under various working conditions can be reduced remarkably, and the station service power consumption rate is decreased remarkably; non-contact operation is adopted, so that the overhaul period of the intelligent adjustable and flexible sealing system can be adapted to an overhaul period of a large boiler body; and the sealing system can be easily adapted to special deformation patterns of rotors in the air pre-heater for thermal ash removing on each side, and the serious ash fouling problem of a denitration air pre-heater is solved.

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 belongs to the technical field of well drilling and discloses an underground natural gas storage injection-production pipe column designing method. By comprehensively considering the influence on a pipe column from self weight of a pipe body, the temperature effect, the pressure effect and the friction effect generated by fluid flowing, on the basis of design of an existing pipe column, compression loads are considered and matched with the compression efficiency of a pipe column connector to design an underground natural gas storage injection-production pipe column, it is ensured that the compression efficiency of a connector of the designed pipe column meets the operation compression load and sealing requirements, and meanwhile as the triaxial stress of the pipe column is considered for design, the overall structural intensity of the injection-production pipe column can meet the operation load requirement. The underground natural gas storage injection-production pipe column designing method not only can meet the airtightness under stretching loads, but also can meet the airtightness of the pipe column after stretching and compression loads interchange, improve the sealing performance of the pipe column under the interchanged loads and ensure long-term safety operation of the injection-production pipe column.

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 provides a construction method for a lifting system of a hydraulic ship lift and a method for controlling the installation precision, and belongs to the technical field of ship lift installation construction. The lifting system of the hydraulic ship lift comprises buoys, movable pulley blocks, winding drums, safety brakes, connecting shafts and steel wire ropes. According to construction method for the lifting system, high-efficiency and high-quality installation of hydraulic floating type lifting equipment can be realized, and the key technical problem of installation of the lifting system for providing driving force for the ship lift can be solved. According to the method for controlling the installation precision, the installation precision of the lifting system is controlled, and therefore accurate control of the installation quality of the lifting equipment and integrated regulation of the lifting equipment after assembly can be realized, reliable guarantee can be provided for safe, smooth and steady operation of the hydraulic ship lift, and the operation efficiency of the ship lift can be improved.

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.