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63 results about "Separation scheme" patented technology

Separation method for removing styrene from ethylbenzene-dehydrogenation tail gas and recovering hydrogen

The invention relates to a separation method for removing small amount of styrene from ethylbenzene-dehydrogenation tail gas and recovering hydrogen and belongs to the field of petrochemical industry. The separation method comprises the following steps: adopting a dehydrogenizing material (ethylbenzene) as an absorbent, carrying out circular absorption on tail gas to reduce the content of the styrene to 30-50ppm; and recovering the ethylbenzene by compression and condensation to reduce the content of the styrene to 5-10ppm and meet the requirement for safe and stable operation of the hydrogen separation and purification section. After deep removal of the styrene, three different separation schemes are adopted for purifying hydrogen so as to meet different requirements of hydrogen purity and recovery rate; by variable-pressure absorption for purification, the concentration of hydrogen is more than 98%, the recovery rate is 80-85%, and the power consumption is 0.21kWh / Nm<3>; by hydrogen-membrane separation for purification, the concentration is more than 95%, the recovery rate is 90-95% and the power consumption is 0.7kWh / Nm<3>; and by coupling of variable-pressure absorption and hydrogen-membrane separation for purification, the concentration of the hydrogen is more than 98%, the recovery rate is 94-97%, simultaneously high purity and high yield are realized and the power consumption is 0.25kWh / Nm<3>.
Owner:DALIAN UNIV OF TECH

Image water-fat separation method and water-fat separation system based on magnetic resonance imaging

ActiveCN105809661AEliminate pollutionPreserve pathology informationImage analysisSeparation schemeErrors and residuals
The invention provides an image water-fat separation method and a water-fat separation system based on magnetic resonance imaging. The image water-fat separation method is characterized in that echo signals corresponding to at least two echo time combinations can be acquired; based on a MR signal model of water and fat chemical shift, the correspondence between the discrete field pattern value and the model fit error of every pixel of the image in the echo signal corresponding to every echo time combination can be acquired to generate the corresponding field pattern-model fit error curve; the field pattern value corresponding to the fit error at the minimum value in the preset field pattern value range can be searched from at least two model fit error curves corresponding to every pixel, and can be used as the to-be-estimated field pattern value; according to the searched to-be-estimated field pattern value, the actual field pattern value corresponding to every pixel can be acquired; according to the actual field pattern value corresponding to every pixel, the water image and the fat image can be acquired. The technical scheme capable of acquiring the field pattern and realizing the water-fat separation can be provided.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI

Clipping bed separation method based on speedup-factor adaptive particle swarm optimization

The invention discloses a clipping bed separation method based on speedup-factor adaptive particle swarm optimization. The method comprises the following steps that: S1: setting an initial limiting condition and the parameter of the SAPSO (Speedup-factor Adaptive Particle Swarm Optimization) for clipping bed separation; S2: according to the initial limiting condition set by a user, calculating a possible bed separation amount: calculating the sum of the amounts of sample sheets which need to be clipped, average each-bed cloth laying layer number and average each-layer cloth clipping piece number according to the amount of sample sheets, which need to be clipped, of each model so as to calculate the upper limit and the lower limit of a required bed separation amount; and S3: firstly, searching a bed separation scheme with a small bed number, if the scheme with the small bed number conforms to requirements, stopping searching a situation with a large bed number, and if the bed separation scheme with the small bed number does not conform to the requirements, searching a bed separation scheme with the large bed number. Under a situation of a certain bed separation bed number, the SAPSO is adopted to search the cloth laying layer number. By use of the method, bed separation scheme determining efficiency is improved, material budgets are reduced, and a clipping amount error is reduced.
Owner:ZHEJIANG UNIV OF TECH

Method for dividing coherent stability regions of strong-connection power grids

The invention discloses a method for dividing coherent stability regions of strong-connection power grids, relates to methods for judging the stability of alternating-current and direct-current power grids, and particularly relates to a method for judging and dividing coherent stability regions of strong-connection power grids. The method includes steps of performing EEAC (extent equal area criterion) simulation on faults of the strong-connection power grids and determining potential instability modes; identifying coherent clusters on the basis of power-angle response curves of power generators according to power-angle swing curves of the power generators, dividing each system into two non-null complementary clusters and reflecting the two non-null complementary clusters into corresponding single-machine planes; finding possible instability clusters in subsequence periods according to instability tracks, dividing the disturbed systems into coherent instability regions and the coherent stability regions so that the stability of the systems can be analyzed according to equal area criteria. The power-angle swing curves of the power generators are obtained by means of transient simulation. The method has the advantages that support is provided for configuring out-of-step separation devices and out-of-step separation schemes for third defensive lines of the power systems, accordingly, power grid stability disruption accidents are effectively prevented, and safe and stable running of large-scale power grids is reliably guaranteed.
Owner:STATE GRID CORP OF CHINA +2

Dry-wet-method mineral separation method used for African sandy diatomite ore

InactiveCN105149084AHigh recovery rateThe fine soil quality is good and stableWet separationPyrophosphateSeparation scheme
The invention relates to the field of mineral processing, and discloses a dry-wet-method mineral separation method used for African sandy diatomite ore. The technical problem that in the prior art, a mineral separation scheme is difficultly suitable for mineral separation and purification of ultralow-grade sandy diatomite ore can be solved through the method. The method comprises the steps that raw diatomite ore is crushed and scattered to obtain diatomite ore powder, and the granularity of the diatomite ore powder is smaller than 10 mm; a self-flow-dividing type air classifier is used for carrying out dry-method classification on the diatomite ore powder to obtain two classified products, namely a classified course product and a classified fine product, and the classification fineness is 10-150 micrometers; water is added to the classified fine product for scrubbing pulping to obtain ore pulp; pH regulators and a dispersing agent, namely sodium pyrophosphate, are added and stirred to be scattered, so that pulp is obtained; the pulp is subjected to centrifugal separation to obtain first precipitate; and the first precipitate is dried to obtain purified diatomite. The technical effects of mineral separation and purification on the ultralow-grade sandy diatomite ore are achieved.
Owner:BC P INC CHINA NAT PETROLEUM CORP +2

Passive parallel separation design method for two-stage aircraft

The invention provides a passive parallel separation design method for a two-stage aircraft, which is characterized in that two-stage injection aircraft comprise a first-stage aircraft and a second-stage aircraft which are connected to two ends of a parallel connecting rod separation mechanism, and the relative positions of the first-stage aircraft and the second-stage aircraft are fixed under the constraint of a connecting mechanism when the aircraft horizontally take off to a separation window; after arriving at the separation window, the connecting mechanism is unlocked; under the combined action of aerodynamic resistance and constraint of the parallel connecting rod separation mechanism, the second-stage aircraft rotates backwards and upwards, after the first-stage aircraft reaches a preset separation angle, the parallel connecting rod separation mechanism and the second-stage aircraft are unlocked, and the first-stage aircraft and the second-stage aircraft are both in a free state and start an unconstrained separation process. According to the method, the contradiction between the first-stage and second-stage shape fusion design and the separation design is solved, safe separation completely depending on aerodynamic force is realized, and the separation scheme is simple and reliable.
Owner:BEIJING AEROSPACE TECH INST

Self-adaptive matching method for control parameters of crosswise-arranged rod medium high-gradient magnetic separator

The invention discloses a self-adaptive matching method for control parameters of a crosswise-arranged rod medium high-gradient magnetic separator. The self-adaptive matching method comprises the following steps that S1, a two-dimensional simplifying model of a rod medium set magnetic field is built, and the magnetic field is divided into a plurality of identical hexagon units to be analyzed; S2,distribution of magnetic field force in an effective capturing area of magnetic particles in the model is calculated; S3, the critical value of a capturing oval is calculated, and the capturing area of the magnetic single particles is determined; S4, according to the critical value of the capturing oval, concentrate separation indexes including the concentrate recycling rate, yield and grade are predicted; and S5, the control parameters of the high-gradient magnetic separator are adjusted, the concentrate recycling rate, yield and grade are calculated and compared under different magnetic media, different pulp concentrations, different flow rates and different background field intensity, and the control parameters suitable for the high-gradient magnetic separator for concentrate separationare determined. The high-gradient magnetic separation efficiency can be pre-estimated effectively, accordingly, a suitable separation scheme is established, and the number of simulating test times isdecreased greatly.
Owner:WUHAN UNIV OF TECH

Controlling and remote metering circuit applied to cubic satellite separation device

The invention provides a controlling and remote metering circuit applied to a cubic satellite separation device. The circuit comprises a working circuit, a backup circuit and an interface circuit. Thefront end of the interface circuit is connected with a rocket controlling and remote metering cable, and the rear end of the interface circuit is connected with the working circuit and the backup circuit. The interface circuit comprises a first connector COM1, a first reed pipe K1 and a second reed pipe K2, wherein the first reed pipe K1 and the second reed pipe K2 are connected with the first connector COM1. The first connector COM1 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin and a ninth pin, wherein the second pin and the seventh pin are connected with the two ends of the first reed pipe K1 separately, the first pin and the sixth pin are connected with the two ends of the second reed pipe K2 separately, the fourth pin and the fifth pin are connected with the working circuit, and the eighth pin and the ninth pin are connected with the backup circuit. Dual-backup design is adopted for a control circuit and a remote metering circuit, any path of work can guarantee that a satellite normally pops up and a correct remote metering signal is transmitted to a rocket, and compared with other satellite separation schemes, high reliability is achieved.
Owner:NANJING UNIV OF SCI & TECH
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