47 results about "Residence time distribution" patented technology

The invention relates to a random polishing track motion method for restraining a track error, which comprises the following steps: confirming to-be-polished points and residence time distribution on a surface of a to-be-polished optical element and utilizing a random track algorithm to generate a polishing sequence and a polishing track of dispersed points on the surface of the to-be-polished optical element; utilizing a residence time compensation method to calculate the residence time distribution for a polishing head motion track to pass through by the polishing points, thereby acquiring the accurate residence time of the dispersed points on the surface of the to-be-polished optical element; generating a random track numerical control polishing program code by a machine tool code conversion program according to the residence time distribution; and polishing all the points on the surface of the to-be-polished optical element by executing the random track numerical control polishingprogram code on a numerical control polishing machine tool. A random track polishing method is used for enabling the motion tracks of the polishing head and polishing grains to approach to random litter distribution according to surface figure distribution, thoroughly removing regular track scratches from the to-be-polished optical element, uniformly spreading the removal function iteration errors among regular tracks on the whole surface figure, and promoting the surface figure accuracy.

The invention relates to the chemical industry and metallurgy field, in particular to coal gasification - lean iron ore magnetizing roasting coupling technique and a coal gasification - lean iron ore magnetizing roasting coupling device. The invention is characterized in that: gasification reaction of coal and reduction action of iron ores are respectively performed in independent reaction chambers, and coal gasification and iron ore reduction are guaranteed to be able to be performed under independent optimal conditions; simultaneously, a coal gasification chamber and an iron ore reduction chamber are also coupled with each other to form a reaction device; the coal gasification is performed in the gasification chamber on the lower part of the reaction device, and reducing gas obtained after gasification enters into a roasting chamber for reducing roasting reaction together with powdery refractory lean iron ores; three to six abnormal tube sinkings are arranged inside a lean iron ore roasting chamber which is divided into four to seven levels of fluidized beds; residence time distribution of lean iron ore particles is guaranteed to be close to plug flow. The invention has the advantages of simple technique, capability of respectively optimizing the gasification reaction of the coal and magnetizing roasting reaction of lean iron ores in one reaction device, even residence time distribution in the lean iron ore particles of the roasting chamber, capability of improving roasting and magnetic separation efficiency, and obtaining of good grade of iron concentrate and iron recovery rate.

In one of its aspects, the invention relates to a process to optimize the dose of a treatment agent for the treatment of a fluid comprising a contaminant. In this first aspect the process comprises the steps of: (a) calculating the dose of the treatment agent based on the relationship between concentration of the treatment agent at one or more points and residence time distribution of the treatment system, and (b) contacting the fluid with the treatment agent in the concentration required to meet the dose calculated in step (a). In another one of its aspects, the invention relates to a process to optimize the dose of a treatment agent for reduction of a contaminant in a fluid.

The invention discloses a magneto-rheological polishing compensation machining method and system for an optical complex curved surface element and a medium. The magneto-rheological polishing compensation machining method comprises the steps that a flat removal function is acquired; sphere removal functions under different curvatures are obtained through mapping; for each residence point in a to-be-machined workpiece surface shape area, the best fitting sphere of the complex curved surface local area nearby the residence point is calculated through fitting, and the sphere removal function corresponding to the curvature of the best fitting sphere of the complex curved surface local area is approximately taken as a removal function of the complex curved surface local area nearby the residencepoint; and a residence time solution algorithm based on a linear equation system model is built, and residence time distribution and surface shape residual errors of all the residence points are solved through simulation to guide magneto-rheological polishing of a to-be-machined workpiece. According to the magneto-rheological polishing compensation machining method and system for the optical complex curved surface element and the medium, the determinacy in the machining process can be effectively guaranteed, and the convergence rate in the machining process is increased.

A method for measuring residence time distribution of tobacco material in processing equipment comprises the following steps: a, a common component is selected from the tobacco material to work as a tracer to meet accuracy detection requirements; b, the tracer is added into a stably working material flow at the equipment inlet through adopting a tracing method, and response value of the variationon the concentration of the tracer along with time is detected with a certain time interval at the outlet, so as to get a residence time distribution (RTD) function; and c, the function is fitted in a nonlinear manner by a proper flowing model to get the model equation of the function, as well as the average residence time of the material and blending rate in the axial direction of the equipment.The invention has the advantages that firstly, a common component is selected from the tobacco material to work as the tracer for measuring the RTD of tobacco material in processing equipment, so that the testing time is short, the influenced area is small, the detect method has high accuracy, less influence is caused to the product quality, and no threatening is caused to the safety of consumers; and secondly, by adopting the method, the WIP (work in process) quality can be predicted, optimized, and controlled.

The invention relates to a device and a method for the online measurement of the residence time distribution of a rotating packed bed, belonging to the technical field of the online determination of the residence time distribution. The device comprises an electrode and an internal pipe, wherein the electrode is installed on the internal side and the external side of the non-conductive packing of the rotating packed bed, and the internal pipe is filled with tracer liquid. The electrode is connected with a slip ring through a conducting wire. The slip ring and a rotating shaft rotate synchronously and the slip ring is connected with a data acquisition system. The method is that gas and liquid with fixed flow are injected into the liquid distributor of the rotating packed bed, the tracer liquid is filled, the slip ring transmits electrical signals to the outside, electric signal data is acquired and residence time distribution function E (t) is obtained by adopting data integral calculation. The invention realizes the online measurement of the residence time distribution and has the advantages of that the real-time performance is high, the continuity is good, the detailed features ofliquid holdup can be comprehensively reflected and the like; and by adopting the conductance method, not only the error caused by the x-ray method, the ultrasonic method, the conductivity method andthe fluorescence method is overcome, but also the online measurement can facilitate the detection of the impacts of all kinds of impact factors of the residence time distribution on the liquid holdup.

In-line diagnosis method for faults of roll-type reverse osmosis membrane uses residence time distribution (RTD) technique. Use NaCl as tracer and inject the inlet of running reverse osmosis membrane by high pressure impulse injecting technique; detect variety curve of NaCl concentration vs. time with conductivity meter on outlet; take numerical conversion with computer to obtain membrane fault characteristic parameter D/ul and corresponding information. This invention has simple process, low cost and high speed, and can provide basis for the optimization design.

The present invention relates to an online measuring system and a method for the residence time distribution of polymer, which belongs to the field of polymer processing. The present invention is used for evaluating the mixing performance of mixing equipment. The PC machine of the system is connected with an optical fiber sensor (6) through a data acquisition card. The optical fiber probe (1) of the optical fiber sensor (6) is arranged on an extruder head (4) and is directly contacted with the melted polymer which is mixed with tracer in the extruder head (4). The transmission light intensity received by the optical fiber has linear relationship with the index of the tracer concentration. So the transmission light is tested and the residence time distribution is obtained. The transmission received by the other optical fiber probe (2) is returned to the optical fiber sensor. The optical fiber sensor generates the corresponding analog quantity according to the intensity of the light received by the optical fiber sensor. A computer samples, so the curve of the residence time distribution analog signal changing with time is real-timely displayed. The present invention has the advantages that the structure is simple, the testing cost is low, the tracer used for measurement is easy to be obtained and so on.

The invention relates to a refractory poor iron ore pulsating fluidized bed magnetizing roasting device and a refractory poor iron ore pulsating fluidized bed magnetizing roasting method. Iron ore powder is magnetized and roasted by adopting a pulsating fluidized bed formed by direct coupling of Rick tube type pulsating combustion and a fluidized bed. The iron ore powder is preheated by an ore heater (6) in a bin (7) and then delivered to a roasting furnace (1), the roasting exhaust is cooled by the ore heater (6) and then delivered to a burner (8) and burnt, and the burnt exhaust is cooled by a gas-gas pre-heater (9), delivered to a bag-type dust remover (10) and then discharged to the atmosphere. Sensible heat of high-temperature iron ore concentrate is reclaimed by an ore cooler (14). The device has the advantages of simple system, compact structure, low energy consumption, reduced resistance, short roasting time and the like; and by using the device and the method, poor phenomena of channeling, dead zone, short circuit and the like of common fluidized bed magnetizing roasting and the problem of over wide residence time distribution of a reactor are effectively solved, and the roasting quality and the roasting efficiency are improved.

The invention belongs to the field of phased array radar resource scheduling, and relates to a sliding window resource scheduling technology based on sectors, in particular to a method for generating digital combined pulse signals with continuous phase positions. The technology is mainly suitable for resource management and distribution of a two-dimensional rotary phased array radar. A radar system carries out resource distribution on multiple functions and multiple tasks according to the sectors, and the residence time of various tasks is adjusted in the sectors in a self-adaptive mode according to loads of the tasks. According to the sliding window resource scheduling technology, when resource distribution is carried out on a current scheduling interval, the task load condition of one sector starting from the current scheduling interval is considered, the task load of one sector starting from the next interval is considered when the next scheduling interval is carried out, and sliding window type resource scheduling is formed. The residence time distribution ratio of the various tasks is determined according to the different work modes of the radar, the detection range, the search data rate, the fine batch number, the determination batch number and the like of the radar are adjusted in a self-adaptive mode according to the time obtaining the tasks, the multiple functions and the multiple tasks are achieved at the same time, and the flexibility and operational effectiveness of the two-dimensional rotary phased array radar are improved.

A method of determining a residence time distribution comprises mixing a molding batch (104) and a tracer (105), wherein the tracer has a ferroelectric curie temperature above 120° C., and transmitting the mixture through a capacitor (107). Further, the method comprises measuring a capacitance of the capacitor, and determining a residence time distribution based on the measured capacitance. In particular, the ferroelectric curie temperature of the tracer may be above 150° C. and preferably the ferroelectric curie temperature of the tracer is above 200° C.

The invention provides a method for measuring solid particle residence time distribution in a fluidized bed based on an image recognition principle and a test bed thereof. Particles different from bedmaterial particles in color are adopted for tracing, the tracing particles are injected into a bed and then sampled at the discharging end regularly, and all samples are photographed under the same light source condition. By performing background elimination, color enhancement and gray scale adjustment processing on a sample image and identifying pixels representing tracer particles by means of RGB threshold segmentation, the concentration of the tracer particles in the image is calculated, and the particle retention time distribution in a fluidized bed can be calculated by combining the change rule of the concentration of the tracer particles with time. The particle residence time distribution measurement method is simple to operate, high in experiment efficiency, few in error generationlinks and high in accuracy.

The invention discloses an impinging-stream-based continuous magnesium hydroxide production process, and relates to a magnesium hydroxide production process. The process comprises the steps that a magnesium salt and precipitant with certain concentration serve as raw materials, an impinging stream reactor is adopted, in the impinging stream reactor, the magnesium salt and the precipitant react at20-90 DEG C, magnesium hydroxide precipitates are generated, the obtained precipitates are aged at 50-120 DEG C for 1-10 hours, then filtering and drying are conducted, and a magnesium hydroxide product is finally obtained. Auxiliary equipment of the process comprises a raw material storage tank, a pump, a flowmeter, a filter, an ageing tank, a dryer and the like. Accordingly, the impinging streamreactor is adopted, the magnesium salt and the precipitant serve as the raw materials, and the magnesium hydroxide product which is high in dispersion, small in specific surface area, uniform in particle size and consistent in crystal form can be obtained. By means of the continuous magnesium hydroxide production process, the materials are mixed rapidly, the reaction is efficient, and residence time distribution is narrow. The process flow is short, the equipment is less, and the product quality is good and stable.

A set of piconets and corresponding methods and computer programs may reduce contention time between piconets. In one embodiment, a seven-length code architecture may be used with group(s) of bands so that contention time cannot exceed 1/7 of the time. Up to seven different bands can be used within each group. When less than seven bands are used (e.g., three or six), at least one of the bands may be assigned to more than one dwell time during a time span. Alternatively, each dwell time within the time span may be assigned to a different band. The state may be changed as needed or desired. Substitution of extra bands may also be used. Using either scheme (repeated bands or changing states), a prime-number architecture can be used with a non-prime number of different bands. Simultaneous communications using at least two bands within a piconet may be used.

The invention is a mathematical modeling evaluation method for tundish flow control effect, comprising the following steps: adopting numerical technique to simulate and track the characteristic value of residence time distribution (RTD) curves of a tracer agent to evaluate the quality on the tundish packet type and a flow control device; establishing evaluation standard for RTD curve quality; the tundish flow control effect being better when dimensionless concentration at peak value of the RTD curve is more than 1, and the dimensionless time corresponding to the peak value is more than 0.75. The method provided in the invention is suitable for evaluating the quality of the tundish packet type and the flow control device, can evaluate the metallurgical effect of the tundish rapidly and effectively, and plays a leading role in optiming and revamping the tundish packet type and the flow control device in site. The method also can be applied to the analysis of water modeling experiment results.

A filter device includes a filter housing (10), a filter inlet (12), a filter outlet (14), and a filter element (16). The filter element divides a filter area (18) into two partial areas (20, 22). One partial filter areas is conical in form with the cross-section of that partial area (20) being tapered from the filter inlet (12) to the filter outlet (14). The partial areas are separated from each other by the filter element. This arrangement results in an optimum residence time distribution inside the filter device at a uniform flow rate, which is particularly useful for highly viscous fluids such as polymer melts or similar.

The present invention relates to a method of estimating the properties of a polymer product by using converted process variables (cPV's) which means process variable that final or intermediate product experienced earlier in average in the reactors by stage with respect to the final product, which incorporates residence time distribution to process variables, wherein said method comprises the following steps of: computing cPV's by incorporating the residence time distribution to said process variables by means of theoretically determining the amounts of content and discharge of the product in the process, and then solving the balance equations of a hypothetical substance by taking the respective process variables as those of the hypothetical substance: and estimating the properties of the product by inputting to various property estimation models cPV's in the reactors by stage with respect to the final product after incorporating the residence time distribution to said process variables.

The invention belongs to the technical field of experimental data acquisition and processing, and discloses a residence time distribution measurement experimental data acquisition and processing system. A data acquisition module acquires and saves experimental data. A data processing module imports the acquired and saved experimental data and draws a curve chart. The data acquisition module of theinvention can stably and accurately acquire data of relevant chemical engineering experiments in real time and display the experimental data in the form of the curve chart on a user interface of thesoftware, so that experiment personnel can timely understand the state of the experiments; after the relevant chemical engineering experiments are completed, the data acquisition module will save theexperimental data in an Excel workbook; and the experimental data processing module can import the experimental data saved by the experimental data acquisition software and draw a curve chart, and then process and calculate the experimental data according to different processing schemes and display the results to users according to requirements of the relevant chemical engineering experiments.

The invention discloses a fixed bed reactor gas phase residence time distribution measuring system and method. The system comprises a gas mass flow meter which is used for detecting the mass value andthe flow value of gas entering a fixed bed reactor in real time, a pressure sensor which is used for detecting pressure change electrical signals on both sides of the inlet/outlet of the fixed bed reactor in real time, a data collector which is used for collecting digital signals corresponding to the pressure change electrical signals at set sampling frequency, and a data calculation unit which is used for acquiring a gas phase residence time distribution curve corresponding to fluid in the fixed bed reactor based on each digital signal. According to the invention, the disadvantages that massspectrometry has high cost and complex operation, response time is too long, precision is not enough and the concentration change of a tracer cannot be truly reflected in an RTD determination methodare solved.

A method and apparatus for operating a pressure vessel containing a bed of particulate material comprising substantially leveling the bed and employing a fluid flow distributor above the bed.

The invention discloses a mobile hot air distribution plate type fluidized bed dryer, and belongs to the technical field of drying equipment and engineering. The dryer is characterized by comprising a box body, a hot air distribution chamber, a mobile hot air distribution plate assembly, a mobile weir plate assembly, a material seal type hot air sealing structure, an air knife, a hot air inlet, awaste gas outlet, a wet material inlet, a product outlet and the like. A drying method using the drying equipment comprises the following steps of: adding a wet material onto a hot air distribution plate through the wet material inlet, performing fluidized drying on fine granules by means of hot air in a mobile hot air distribution plate type fluidized bed, drying coarse granules and the mobile hot air distribution plate together while moving, discharging the dried qualified product from the product outlet, and exhausting the waste gas from the waste gas outlet. The dryer has the advantages of simple structure, easiness in manufacture, small floor area, narrow material residence time distribution, uniform water content of the product, and safety and convenience in the operation process.

The invention discloses an integrated experiment system for measuring tank reactor amplification effect. Residence time distribution functions of three tank reactors with similar geometric structuresand same feeding and discharging positions are measured, so that the amplification effect of the tank reactors can be acquired. The system is provided with a water storage box, the electrical conductivity of inlet materials consistently keeps stable, effectiveness of experiment data is improved, generation of surface dead zones can be effectively avoided by the aid of an overflowing mode and an electrical conductivity probe, liquid level of reaction materials in the tank reactors can be controlled, amplification factors of the tank reactors are changed, a circular branch is arranged at an outlet of a water pump, the requirements of the three reactors for different feeding flow rates are met by one water pump, the system is simple in structure and convenient and rapid to operate, all experiment devices are integrated, functional partitions are reasonable, appearances are simple and elegant, and an experimenter can know definition of the reactor amplification effect and measuring methodof amplification rules through the system.