35results about How to "Slow ascent rate" patented technology

A device for breaking DC currents exceeding 2500 A has a resonance circuit (2) connected in parallel with an interrupter (1) and a surge arrester (7) connected in parallel with the resonance circuit. The resonance circuit has a series connection of a capacitor (3) and an inductance (4). The specific value relationship of the capacitance in microfarad to the inductance in microhenry of the resonance circuit is not less than 1.

The invention relates to a compression method for a dynamic range of echo energy of a laser radar system. The compression method is particularly suitable for a two-shaft structure. A certain negative included angle is formed between a light emission shaft and a light receiving shaft, so that the rising rate, which is increased with the detection distance, of an overlapping factor is reduced, and the dynamic range of the laser echo energy can be compressed favorably; furthermore, a detector is arranged at a position spaced from a focal plane of an optical system at a distance so as to obtain an optimal laser echo energy response. Due to an experimental formula and a conclusion which are provided by theoretical analysis and value calculation, the compression method has a guiding significance for the whole design and the performance estimation of the laser radar system.

The invention discloses a smelting method of low-carbon high-phosphorus steel and the low-carbon high-phosphorus steel, and belongs to the technical field of metallurgy. The smelting method of the low-carbon high-phosphorus steel comprises the steps of charge weight control, wherein the weight ratio of molten iron to waste steel is controlled to be (3.4-4.2):1; and blowing control, wherein a firstbatch of raw dolomite is added for slagging 30-60 s after blowing is started and ignition is carried out. The molten iron and the waste steel with the weight ratio of (3.4-4.2):1 are smelted, moltenpool heat balance is basically kept, and damage to furnace liner refractory materials can be reduced. The first batch of raw dolomite is added 30-60 s after blowing is started and ignition is carriedout, the raw dolomite is fast dissolved to fast slag, the utilization rate of oxygen is increased, and scouring of high-speed jet to the furnace liner refractory materials is relieved; and the raw dolomite is decomposed and absorbs heat, decomposed MgO can inhibit and relieve erosion of slag to furnace liner bricks, and the function of protecting a furnace body can be achieved well.

The invention discloses a processing method of ethylene tar. The method consists of: fractionating ethylene tar into light fraction and heavy fraction, mixing the heavy fraction with a conventional coking raw material, conducting delayed coking to obtain coker gasoline, coker diesel oil and coker gas oil, mixing the obtained coker gasoline and coker diesel oil with the ethylene tar light fraction, leaving the mixture to undergo a hydrofining reaction, distilling the product to obtain gasoline fraction I and fraction heavier than gasoline; mixing the fraction heavier than gasoline with the coker gas oil, and subjecting the mixture to hydrotreating so as to obtain gasoline fraction II and a diesel oil product, and mixing the gasoline fraction I with the gasoline fraction II to obtain a final gasoline product. Directed at the characteristics of high content of aromatic hydrocarbon, colloid, carbon residue and asphaltene in ethylene tar, the method provided in the invention fractionates the ethylene tar into light fraction and heavy fraction, adopts different processing processes, increases the added value of ethylene tar, enhances the yields of gasoline and diesel oil, improves the product quality of light fuel oil, and also enables the equipment to run smoothly for a long period.

The invention discloses a treatment method of ethylene tar. The method consists of: fractionating ethylene tar into light fraction and heavy fraction, mixing the heavy fraction with a conventional coking raw material, conducting delayed coking to obtain coker gasoline, coker diesel oil and coker gas oil, mixing the coker diesel oil with the ethylene tar light fraction, performing rectification / crystallization purification to obtain naphthalene, mixing the naphthalene removed oil, naphthalene after-cut oil, with the coker gasoline and the coker gas oil, taking the obtained mixture as a hydrotreating raw material, leaving the material to undergo a hydrofining reaction, separating gasoline fraction I, subjecting the obtained fraction heavier than gasoline to hydrocracking so as to obtain gasoline fraction II and a diesel oil product, and mixing the gasoline fraction II with the gasoline fraction I so as to obtain a final gasoline product. Directed at the characteristics of high content of aromatic hydrocarbon, colloid, carbon residue and asphaltene in ethylene tar, the method provided in the invention fractionates the ethylene tar into light fraction and heavy fraction, and adopts different processing processes, thus increasing the added value of ethylene tar. While generating the chemical raw material naphthalene, the method also improves the product quality of light fuel oil, and also enables the equipment to run smoothly for a long period.

The invention specifically discloses a high-temperature pressure sensor. The problem that a conventional pressure sensor is invalidly isolated in a high-temperature environment and cannot work normally due to an unreasonable structure is solved. The high-temperature pressure sensor comprises a columnar shell with an open upper end; the upper end of the shell is provided with an upper end cover with a center hole; the lower bottom surface of the upper end cover is provided with a step-shaped upper heat-insulating ring; the upper part of the step-shaped upper heat-insulating ring penetrates into the center hole of the upper end cover; the lower surface of the upper heat-insulating ring is provided with a heat sinking body; a gap is maintained between the heat sinking body and the inner sidewall of the shell; further, the center of the heat sinking body is provided with a through hole; a pressure guiding pipe communicated with the through hole of the heat sinking body and further penetrating through the upper heat-insulating ring is fixed at the upper end of the heat sinking body; a lower heat-insulating ring which is in contact with the heat sinking body and the inner wall of the lower end of the shell is arranged between the heat sinking body and the inner wall of the lower end of the shell; the inner wall of the lower end of the shell is provided with a groove; and a pressuresensor main body communicated with the through hole of the heat sinking body is placed in the groove. The high-temperature pressure sensor has the advantages of reasonable and reliable structure, andalso can work for a long time while the purpose that the pressure sensor can carry out pressure measurement in the high-temperature environment is met.

The invention relates to a spinning method of oligomer-reduced high-viscosity polyester melt in the technical field of chemical fiber production, which transports the high-temperature melt after viscosity increase to the spinning mechanism through a multi-stage screw pump; the screw The temperature of the high-temperature melt at the output end of the pump is 285±5°C; a mixer is installed after each stage of the multi-stage screw pump, and the low-temperature melt is input into the mixer through the bypass input port, and mixed with the high-temperature melt in the mixer , reduce the temperature of the high-temperature melt, so that the temperature of the output melt of each stage mixer is 280±5°C; output the melt to the spinning mechanism through at least two stages of screw pumps and mixers for spinning, and the screw pumps step by step Pressurization, the melt temperature at the front end of the spinneret is 285±5°C, and the melt pressure is 12‑16Mpa. This method can effectively reduce the flow rate of the melt, reduce the chance of shear temperature rise, and at the same time, eliminate the influence of shear temperature rise through mixing and cooling, thereby reducing the generation of cyclic oligomers and ensuring the spinning quality.

The invention relates to a transverter direct current side fault current suppression method based on additional virtual inductance coefficient, belonging to the technical field of flexible direct current power transmission. Firstly, a calculation method of influence of partially cutting a submodule after short circuit fault of a transverter outlet on an alternating current system is put forward, discharge current capacity of an IGBT device and breaking capacity of a direct current breaker are considered comprehensively, a suppression method of transverter direct current side short circuit fault current is put forward, wherein the suppression method can reduce investment proportion of the submodule after fault happens, meanwhile, a fault current suppression method of changing investment proportion of the submodule after fault through mapping the virtual inductance coefficient into a control system is also put forward, and a setting method of the virtual inductance coefficient is also provided. The method, applied to a MMC transverter, can effectively reduce rising rate of the fault current, reduce overcurrent stress of the direct current breaker which cuts off the fault device, andhas good economic efficiency and practicability in comparison with a method of performing fault current suppression through an additional current limiting device.

The invention relates to a fluid distribution system for a rapid-cooling heat exchanger. Heat exchange tubes of the rapid-cooling heat exchanger comprise a center heat exchange tube (3) and a periphery heat exchange tube (5), the entrance end of the center heat exchange tube (3) is a short uniform-flow tube (4), the exit end of the center heat exchange tube (3) is an equal-diameter tube, the short uniform-flow tube (4) and the equal-diameter tube are butt-welded, so as to form the whole center heat exchange tube (3), and the periphery heat exchange tube (5) is an equal-diameter tube, the inner diameter of the inner tube of which is invariable in the full-length range. By adopting the method, the flow resistance property of the center heat exchange tube (3) is adjusted to lead the flow resistance of the center heat exchange tube (3) to increase properly, thus reducing the cracking gas flow in the center heat exchange tube (3) and increasing the cracking gas flow in the periphery heat exchange tube (5), so as to lead the fluid to distribute uniformly. The rapid-cooling heat exchanger which is provided with a fluid distribution system can distribute the cracking gas into each heat exchange tube uniformly, thus improving the utilization ratio of the heat exchange tubes and prolonging the running period.

A dynamic biofunctional leg protector, including a biomechanical protective belt set based on the structural position and direction of the tendons, ligaments and muscles of the knee, and the biomechanical characteristics of the human body during exercise. The biomechanical protective belt includes a cruciate ligament protective belt , patellar tendon protection belt, thigh muscle group protection belt, calf muscle group protection belt; the elastic modulus of the cruciate ligament protection belt and patellar tendon protection belt changes in stages based on the stretch ratio of the fabric caused by knee bending, and changes in stages It includes the initial stretch low modulus stage, stretch abrupt change stage, and stretch high modulus stage that gradually transition as the knee angle decreases. The present invention provides comfortable elastic protection for athletes to perform knee-bending movements, automatically adjusts the elastic modulus of the knee material according to the size of the knee angle caused by different knee-bending ranges, and can provide health and comfort under small knee angles and high exercise volumes Stretch protection with a thermal comfort zone to wick away perspiration, and a reinforced cleat to keep the suit from slipping.

The invention relates to the technical field of cooling industrial equipment and particularly discloses a waste heat recovery assembly which comprises a vertically arranged heat absorption cylinder, wherein the heat absorption cylinder comprises an inner cylinder and an outer cylinder; a passage allowing a heat exchanging medium to circulate is formed between the inner cylinder and the outer cylinder; a top cover covering the heat absorption cylinder is arranged at the top of the heat absorption cylinder; and an inverted tapered bulge is arranged in the bottom center of the top cover. With adoption of the technical scheme, the problem in the prior art that hot airflow continuously overflows out of the top of the recovery assembly to greatly lower the waste heat recovery effect is solved.