37results about How to "Economical and reasonable design" patented technology

The invention provides an X52 pipeline steel hot-rolling coiled plate with a super-thick specification and a production method for the same. Steel contains, by weight, the chemical ingredients including 0.060%-0.070% of C, 0.15%-0.25% of Si, 1.40%-1.50% of Mn, 0.034%-0.050% of Nb, 0.008%-0.022% of Ti, 0.11%-0.17% of Cr, 0.015%-0.045% of Al, P<=0.02%, S<=0.008%, N<=0.008%, Pcm<=0.17%, and the balance being Fe and inevitable impurities. The plate and the production method provided by the invention have the beneficial effects that the X52-grade pipeline steel designed with C-Mn-Nb-Cr series is used; the thickness specification exceeds 20mm; product alloy design is economic and rational; technological paths are simple and easy to execute; production efficiency is high; well-closed formation inthe thickness direction is ensured; and toughness is very high.

The invention discloses a low-hardness X70M pipeline steel hot-rolled plate coil and a manufacturing method thereof. Wherein the steel contains 0.061%-0.061% of C; 0.080%, si 0.15%- 0.35%, mn 1.41% toMn 1.41% 1.59%, nb0.060%- 0.080% of V, 0.010%-0.030% of V, 0.008%-0.020% of Ti, 0.13%-0.18% of Mo, 0.13%-0.19% of Cr, 0.020%-0.060% of Al, smaller than or equal to 0.018% of P, smaller than or equalto 0.004% of S and smaller than or equal to 0.007% of N; wherein Pcm is smaller than or equal to 0.19%, and the balance Fe and inevitable impurities. Casting blank thickness below 200 mm. And a casting blank is subjected to hot charging at 500-850 DEG C and heated to 1150-1200 DEG C, the finish rolling temperature of rough rolling is 980-1050 DEG C, the finish rolling starting temperature of finish rolling is 910-960 DEG C, the finish rolling temperature is 780-840 DEG C, the cooling speed is 12-30 DEG C/s, and the coiling temperature is 470-530 DEG C. And the hardness value of the producedX70M-grade hot-rolled plate coil is smaller than or equal to 230 HV10.

The invention provides a method for recycling excess sludge of a municipal sewage plant. The method comprises the following steps: (1) feeding the excess sludge into an acidification and mixing tank to adjust TS concentration and pH value of the sludge, then carrying out ultrasonic wave and microwave treatment, adding crushed straws or/and fecal residues, and then adding a solidification stabilizer to carry out adsorption passivation treatment on heavy metal ions in the sludge; (2) carrying out anaerobic fermentation; (3) dehydrating and desulfurizing biogas generated by anaerobic fermentation, delivering the biogas into a double-membrane gas storage cabinet, and generating electricity by utilizing the biogas; (4) sterilizing the sludge generated by anaerobic fermentation and carrying outsolid-liquid separation to obtain biogas residue mud cakes and biogas slurry; (5) returning part of the biogas slurry to the acidification and mixing tank, and carrying out nitrification and denitrification treatment on the rest biogas slurry to reach the standard and then discharging the biogas slurry; and (6) adding nutrient elements into the biogas residue mud cakes, and drying and granulatingthe biogas residue mud cakes to obtain a granular organic fertilizer. According to the method, the environmental protection property of an existing excess sludge treatment method can be improved, theresource utilization degree of the excess sludge can be improved, and the treatment energy consumption of the excess sludge can be reduced.

The invention relates to an electroslag remelting furnace. The invention aims at providing to an electroslag remelting furnace with which three-phase power supply is adopted. With the electroslag remelting furnace, double arm electrodes are replaced in turn, and the double arms work alternately. The electroslag remelting furnace comprises an elevation platform and a platform elevation device used for driving the elevation platform to move up and down. A motorized flatcar is arranged on the elevation platform. A crystallizer is arranged on the top of the motorized flatcar. Two columns are arranged beside the platform elevation device. A cross arm is arranged on the upper part of each column. The cross arms and the columns are connected through connection devices. The connection device comprises a rotation device which can drive the cross arms to rotate around the axes of the columns, and an elevation device which can move along an axial direction of the columns. Fixture heads used for fixing electrodes are arranged at free ends of the cross arms. The electroslag remelting furnace has the advantages that: network load is balanced, and interference is low; electroslag ingot uniformity and compactness are improved; the furnace is suitable for the productions of large-tonnage and large-size metal materials, especially electroslag ingots with 10-150 tons, which are used in high-end large forgings such as nuclear power main pipes, reactor internals, ultra-supercritical rotors, and the like.

The invention provides an oxidation ditch membrane bioreactor, a wastewater treatment process and an application thereof. An oxidation ditch is arranged in the oxidation ditch membrane bioreactor; the oxidation ditch membrane bioreactor comprises an anoxic zone and an aerobic zone which are continuously arranged or an anaerobic zone, the anoxic zone and the aerobic zone which are continuously arranged; one or more membrane bio-reaction zones are arranged in the aerobic zone; a sewage inlet is arranged in the anoxic zone or the anaerobic zone; the membrane bioreactor is organically combined with the oxidation ditch; the advantages of S-MBR and R-MBR are fully utilized; sludge backflow is reduced or cancelled; the technical process and the power equipment are simplified; as S-MBR running, the oxidation ditch membrane bioreactor can realize in-situ online cleaning and soaking cleaning; as R-MBR running, the oxidation ditch membrane bioreactor can increase the land use rate and simplify operation and maintenance; an aerating system is optimized; the pulse aeration is combined for guaranteeing the valid oxygen demand in each zone, so that energy consumption waste is avoided. According to the invention, through the optimal combination of the reactor, the processing effect of nitrogen and phosphorus removal can be enhanced, the energy consumption can be saved and the land occupation can be saved.

The invention discloses low-temperature L450M pipeline steel and a manufacturing method thereof. The low-temperature L450M pipeline steel comprises, by weight, 0.050-0.070% of C, 0.10-0.25% of Si, 1.61-1.70% of Mn, 0.056-0.070% of Nb, 0.21-0.30% of Cr, 0.008-0.020% of Ti, 0.015-0.045% of Al, no more than 0.020% of P, no more than 0.006% of S, no more than 0.008% of N, and the balance iron and inevitable impurities, and the cold crack sensitivity coefficient Pcm is smaller than or equal to 0.18%. The thickness of a casting blank is smaller than or equal to 200 mm; the casting blank is subjectedto direct hot charge at the temperature of 500-850 DEG C and heated to be 1140-1200 DEG C, the rough rolling finished rolling temperature is larger than or equal to 970 DEG C, the finish rolling inlet temperature is smaller than or equal to 970 DEG C, and the finish rolling outlet temperature is 790-830 DEG C; then a steel plate is cooled in ultra fast cooling and laminar cooling modes, the cooling speed is higher than or equal to 15 DEG C/s, and low-temperature coiling is conducted under the temperature of 450-550 DEG C. The produced steel plate has good low-temperature performance.

The invention provides a method for determining the critical buckling load of a deck longitudinal beam column supported by a cantilever cross beam, and belongs to the technical field of ship structure engineering. The method includes the following steps: 1. establishing a deck longitudinal beam unstability mechanics model; 2. establishing a cantilever cross beam mechanics equation, and determining a fundamental frequency calculation formula: 3. establishing a cantilever cross beam fixed end torsional rigidity calculation model, and determining torsional rigidity; 4. determining supporting rigidity of the cantilever cross beam to the deck longitudinal beam; 5. determining the buckling load of the deck longitudinal beam column which is supported by the cantilever cross beam; 6. obtaining the critical buckling load of the deck longitudinal beam column supported by the cantilever cross beam; and 7. in combination with a ship girder residual rigidity impact factor, guiding the design of a ship structure. According to the invention, the method can rapidly determine large-range collision and damage and the critical buckling load of the deck longitudinal beam column, reveals the pattern of how the ultimate strength of a grillage of the deck is affected, and guides the design of residual strength of the ship body.

The invention relates to a concrete external wall prestress system establishment method which includes the steps: 1) calculating initially applied tension control prestress of a prestress system; 2) respectively calculating prestress loss of circumferential horizontal prestress tendons and vertical prestress tendons; 3) respectively calculating effective prestress of the circumferential horizontal prestress tendons and the vertical prestress tendons; 4) respectively calculating the number of the circumferential horizontal prestress tendons and the number of the vertical prestress tendons to obtain the arrangement range of the prestress tendons of a whole concrete wall body; 5) calculating the reinforcement area of an anchor bed in the prestress system; 6) arranging the prestress tendons in the concrete wall body according to the obtained number of the circumferential horizontal prestress tendons and the obtained number of the vertical prestress tendons, and performing engineering reinforcement for the anchor bed according to the calculated area of anti-explosion spiral bars and plain bars to establish the concrete external wall prestress system. The method can be widely applied to establishing the concrete external wall prestress system for a large LNG (liquefied natural gas) full-capacity storage tank.

The invention discloses a method for reducing soil pressure applied by a two-layered filling roadbed to a retaining wall. The method can be used for reducing the soil pressure applied by the two-layered filling roadbed to the retaining wall in the road construction process. In the invention, calculation of the soil pressure applied by the two-layered filling roadbed to the retaining wall is not based on Coulomb's earth pressure theory, but the flow rule related to force analysis and filling motion on horizontal soil layer unit bodies behind the retaining wall. The method, disclosed by the invention, not only can obtain the strength and distribution of the soil pressure applied by the two-layered filling roadbed to the retaining wall, but also can analyze the influence of different filling sequences on the soil pressure, thus selecting a lower soil pressure scheme. The method is very important in practice for scientifically and reasonably guiding design of the retaining wall in the road construction process.

The invention discloses a method for designing an interlocking pile soil retaining structure, which is a design and calculation method for distinguishing different matching forms of reinforced and plain concrete piles as for interlocking piles. By adoption of the method, the defect that the prior direct equivalent stiffness method can not take the mechanical property of an occlusal surface and the stiffness contribution of an adjacent pile into consideration, thereby the design of the piles can be more reliable, more reasonable and more economic.

The invention provides a steel bar structure of a thick raft and an inversion construction method of the steel bar structure. The steel bar structure of the thick raft is composed of multiple raft face ribs, multiple raft bottom ribs, multiple stirrups and a supporting frame. The supporting frame is installed on a raft cushion layer, the multiple raft face ribs are laid on the supporting frame, the multiple stirrups are arranged on the multiple raft face ribs arranged in the same direction in a sleeving manner, the upper portions of the multiple stirrups are arranged on the multiple raft faceribs in a hanging manner, the multiple raft bottom ribs are arranged in the multiple stirrups in a penetrating manner, the lower portions of the multiple stirrups are supported on the multiple raft bottom ribs, the raft bottom ribs are fixedly connected to the lower portions of the stirrups, and the raft face ribs are fixedly connected to the upper portions of the stirrups. The steel bar structuresolves the problems that the use amount of traditional thick raft steel is large, and the cost is high.

The invention discloses a steel catenary riser fatigue simplification calculation method considering slow drifting motion. The method comprises the following steps that S1, establishing a steel catenary riser platform motion model; S2, carrying out Newmark-beta process and Newton-Raphson iteration to solve a displacement time history at a suspension point; S3, respectively applying displacement time history under wave frequency and slow drift effects at suspension points of the model; S4, calculating the stress time history under the slow drift effect and the stress time history of three standard positions under the wave frequency effect by using Orcaflex software; S5, proposing a position combination superposition method to combine stress time history curves under the action of superposition wave frequency and low frequency; S6, compiling a Matlab program based on a rain flow counting method to obtain a stress amplitude and a stress cycle index; S7, selecting S-N curve and carrying out combined damage fatigue calculation according to the Palmgren-Miner cumulative damage criterion. According to the method, the calculation efficiency is greatly improved while the calculation precision is ensured.

The invention relates to a design method for embedded track bed structures of tramcar. According to the method, experiments are carried out by adoption of a response surface method and regression analysis is carried out on structures on the basis of sufficiently investigating and surveying design information of track beds of tramcars and basically grasping design parameters of tramcar vehicles, tracks and beds, so that function relationships between steel rail vertical displacement, track board longitudinal bending moment, foundation bed top surface deformation and foundation bed top surface dynamic stress and various main design parameters, and evaluation and optimization are carried out on an embedded track bed structure design scheme according to the function relationships so as to finally obtain an economic and reasonable design scheme.

The invention discloses an advanced treatment and recycling technology of printing and dyeing wastewater. In the technology, a wastewater collecting and adjusting tank, a biochemical aerobic system, a secondary sedimentation tank, a tertiary flocculation and sedimentation tank, an MBR membrane bioreactor, a bag filter and a reverse osmosis membrane system are adopted. According to the technology, organic matters are treated by the biochemical aerobic system to be decomposed into small molecules from macromolecules, so that the separation and purification of the reverse osmosis membrane to sewage are facilitated, and the pollution and blockage of the organic matters to a membrane component are prevented; suspended matters and turbidity can completely meet the water inflowing requirement of the membrane component of the reverse osmosis membrane through four-stage continuous filtering by the secondary sedimentation tank, the tertiary flocculation and sedimentation tank, the MBR membrane bioreactor and the bag filter; the design of the process route is economical and reasonable, and the possibility of the pollution blockage of a printing and dyeing wastewater reverse osmosis membrane treatment system can be greatly reduced.

The invention relates to a circular anti-leakage reinforced concrete pool which comprises a reinforced concrete pool body. The reinforced concrete pool body is defined by a cylindrical pool wall and a foundation base plate and is characterized in that an interlayer base plate is arranged above the foundation base plate and divides the reinforced concrete pool body into a water storage area and a water non-storage area, and a double-base-plate reinforced concrete structure is formed, so that the influence of the temperature change effect on the pool is concentrated to the pool wall between the foundation base plate and the interlayer base plate, and temperature stress of the water storage area is reduced. According to the circular anti-leakage reinforced concrete pool, due to the facts that the interlayer base plate is arranged above the foundation base plate to form the double-base-plate reinforced concrete structure, and the influence of the temperature change effect on the pool is concentrated to the pool wall between the foundation base plate and the interlayer base plate, the problems that in the prior art, the effect of preventing the pool wall from being cracked is poor, the reinforced structure is complex, the using amount is large, and the cost is high are solved.