47results about How to "Stable temperature gradient" patented technology

The invention provides a method and a device for coaxial combined machining with tubular electrode discharging and laser irradiation, and belongs to the field of non-traditional machining and combined machining. Micro-etching machining is performed on the surface of an insulating high-hardness brittle material by virtue of a coaxial action of cone-shaped tube electrode discharging and laser irradiation, recessive material defects and stress concentration generated by pulsed laser acting on the surface of a workpiece can attract spark discharge to always act on the current area, and meanwhile, the spark discharge changes the surface shape and physico-chemical property of the current area, then nonlinear absorption of the current area on laser energy is improved, a local field enhancement effect is generated, and pulsed laser focused irradiation can accelerate an electrochemical reaction to promote generation of a stable discharge gas film layer on the surface of a hollow tool electrode; and the interactive cooperation of two types of energy achieves fixed-area micro-etching of the insulating high-hardness brittle material, the machining efficiency is significantly improved, and the machining quality is improved.

The invention discloses a method for preparing a highly-uniform synthetic quartz glass weight. Preparing is conducted through a vertical depositing furnace based on chemical vapor deposition, raw materials are led into a combustor and chemically reacted in the depositing furnace, silicon dioxide particles are formed, the depositing foundation of the quartz glass weight is a concave depositing pool formed by a bottom face and a side wall, the silicon dioxide particles formed based on chemical vapor synthesis are melted and freely scattered and deposited in the depositing pool, and the temperature gradient of the depositing face is lower than 20 DEG C. According to the method for preparing the highly-uniform synthetic quartz glass weight, the distributing consistency of quartz glass weight components is improved, and the quartz glass weight uniform in radial and axial structure is produced.

The invention discloses a large-diameter silicon crystal growth device. The device comprises a heat-preserving system, a heating system, a stream guidance system and a supporting device, wherein the upper part of the heat-preserving system is provided with a heat-preserving cover plate and a furnace bottom heat-preserving structure; the heat-preserving cover plate adopts a double-layer structure, namely, an upper heat-preserving cover plate (1) and a lower heat-preserving cover plate (2) superposed on each other; and a clearance between the upper heat-preserving cover plate (1) and the lower heat-preserving cover plate (2) is filled with a graphite carbon felt. The technical scheme is used for controlling silicon monocrystals of 8 inches and more than 8 inches. Compared with the prior art, the device has the advantages of achieving better energy conservation, consumption reduction and inert gas guidance, improving the heat-preserving effect of the heat-preserving system, reducing heat radiation, changing temperature gradient in a melt, reducing the change of transverse temperature gradient, relatively stabilizing the liquid level temperature of the melt, contributing to the growth of silicon monocrystals, improving an air stream guidance device and preventing gas turbulence.

The invention relates to field of polycrystalline silicon ingot casting, in particular to an opening-free heat insulation cage ingot casting device and method. The device comprises a heat insulation cage, wherein a lateral heater is arranged on the inner side face of the heat insulation cage, a top heater is arranged at the top in the heat insulation cage, and the lateral heater and the top heater are separately controlled by double power supplies. In a melting step, the temperature of an air cooling DS block is controlled not to be higher than 1400 DEG C. In astep of change from melting to crystal growth, the temperature of an air cooling DS block is 1300-1360 DEG C, the temperature of the top heater is 1530-1545 DEG C. In a crystal growth step, the temperature of the top heater is reduced from 1430 DEG C to 1400 DEG C, and the temperature of the air cooling DS block is reduced from 1300 DEG C to 1000 DEG C. By the adoption of the opening-free heat insulation cage ingot casting device, the heat insulation cage cannot be needed to be opened, the subfissurescrap ratio of cut silicon wafers is reduced by about 15%, the dislocation number of silicon ingots in growth is effectively controlled, the photoelectric conversion efficiency of silicon wafer products is high, and the stability is good.

The invention discloses a heat storage premixed biomass gas combustor and a using method thereof. The combustor comprises a porous medium heat storage premixing pipeline, an inner combustion-supporting air pipeline, an outer gas pipeline, an outer combustion-supporting air pipeline, a first sleeve, an inner combustion-supporting air rotational flow adjusting pull rod, a second sleeve, an outer gasrotational flow adjusting pull rod, a plurality of inner combustion-supporting air axial rotational flow blades and a plurality of outer gas axial rotational flow blades. The porous medium heat storage premixing pipeline, the inner combustion-supporting air pipeline, the outer gas pipeline and the outer combustion-supporting air pipeline are sequentially distributed from inside to outside, an outlet of the porous medium heat storage premixing pipeline is filled with a ceramic foam type porous medium, and an inlet of the porous medium heat storage premixing pipeline coaxially communicates witha central gas pipeline and a central combustion-supporting air pipeline. According to the combustor and the using method thereof, the purpose of efficient and low-pollution combustion of biomass gascan be achieved.

The invention relates to a fine particle thermophoretic deposition dedusting method and a system thereof. The system is mainly composed of a thermophoretic deposition deduster, a waste heat lithium bromide refrigeration system, a gas heating device and an electric appliance control system. According to the invention, dust-laden air flow flows into a gas insulating chamber from a dust-laden air-flow inlet, then is introduced into a square plane cold wall pipe under effect of an induced draught fan and performs thermophoretic deposition movement, the air flow flows out from the square plane cold wall pipe and then continuously and downwardly flows due to effects of inertia and negative pressure effects, then the air flow is discharged through an air-flow outlet 69 from a negative pressure chamber until the air flow at the bottom of a conical cylinder is slowly risen, and the air flow is introduced into an inlet of the induced draught fan, so that a purpose of separating gas and dust can be realized. The method takes on-site practical tests as a base, a theoretical equation is taken as a reference, the organic combination of the theoretical equation and the on-site practical tests makes that the control of the thermophoretic deposition system and the practical condition are matched, so that the deduster has high thermophoretic deposition rate. The lithium bromide waste heat is used for refrigeration, so that energy is saved, and the environmental protection is realized.

The invention discloses a propane deasphalting method for paraffin-based vacuum residuum with low needle penetration. The paraffin-based vacuum residuum with needle penetration lower than 200/0.1 mm and intermediate-based vacuum residuum with needle penetration higher than 200/0.1 mm are mixed in a molten state and fed into a propane deasphalting device for propane deasphalting treatment, so that deasphalted oil and deoiled asphalt are separated out. According to the method, the paraffin-based vacuum residuum with low needle penetration is modified, so that mixed phase does not appear in an extraction tower during extraction treatment, the deasphalted oil and the deoiled asphalt are separated effectively, and pipeline blocking and other phenomena cannot be caused.

The invention discloses an overflow water distributor and a system for uniformly renewing water in a water pool. The overflow water distributor comprises a water distributor shell (11) and a water distributor cap (12). The water distributor shell (11) is of a conical cylinder structure. The water distributor cap (12) is of a sheet structure. The outer portion of the bottom end of the water distributor shell (11) is covered with the water distributor cap (12). A strip-shaped gap for water flow to pass through is formed between the bottom end of the water distributor shell (11) and the water distributor cap (12). By means of the system for uniformly renewing the water in the water pool, uniformity and stability of an internal circulation system in the water storage pool can be improved.

The invention relates to a multilevel power generation system. One end of an insulation box is arranged on the back surface of a vacuum heat collector, clapboards are arranged inside the insulation box, and divide the insulation box into a plurality of mutually independent sealed small space, one end of a heat pipe is inserted inside the insulation box, the other end of the heat pipe is connected with a temperature difference power generation element. Two ends of the temperature difference power generation element are respectively connected with the heat pipe or a radiator, the radiator is arranged on the wall surface of a radiation terminal of the multilevel temperature difference power generation element, heat transfer working medium is filled in the sealed small space inside the insulation box, the vacuum heat collector is used for collecting solar energy, the insulation box and heat conduction oil are used for storing heat, stable temperature gradient can be provided for the multilevel temperature difference power generation element through the insulation box small space formed by the clapboards, the radiator reduces cold side temperature of the multilevel temperature difference power generation element through heat convection, end face temperature difference required in the multilevel temperature difference power generation element is formed, and electrical energy is provided for lamps and lanterns. The multilevel power generation system has the advantages of being compact in design, simple in installation, free of mechanical transmission parts, and high in reliability.

The invention relates to a dust removing method in the production process of metallurgical pellets, in particular to a dust removing system of a chain grate machine tail part. The dust removing system comprises a chain grating machine tail part mechanism with a chain grate machine wheel and a chain grate machine tail wheel return device; the dust removing system is characterized in that a machine tail seal cover is arranged on the chain grate machine tail part mechanism; chain grate machine tail wheel return segment dust removing devices are arranged on the upper part of the machine tail seal cover; an overall chain grate machine tail dust removing device is arranged in the middle part of the machine tail seal cover; and a tail sealing wind box dust removing device of the chain grate machine is arranged at the end part of the lower return of the chain grate machine tail. According to the dust removing system provided by the invention, as the chain grate machine tail wheel return segment dust removing devices are arranged at the three main dust-raising spots of the chain grate machine tail mechanism, and are connected with external exhaust fans by pipelines, thereby forming a negative pressure environment; the three dust removing systems are compensated to one another and are linked with one another, so that the high temperature waste gas can be effectively prevented from overflowing, the tail machine environment of the chain grate machine workshop can be improved, the service life of the heat resistant parts of the equipment can be ensured; and moreover, the temperature gradients of the materials are smoothed, and the mine return quantity of the cured pellets can be reduced.

The invention relates to the field of technologies for treating volatile organic compound waste gas, in particular to a special slag cooler for heat storage secondary combustion purification devices for treating and adsorbing VOCs (volatile organic compounds) waste gas and solid waste. The special slag cooler is characterized by comprising an ash blowing machine, a jacket type air-cool spiral conveyor, an air shutdown valve and a drum type slag cooling assembly. According to the technical scheme of secondary slag ash cooling, the special slag cooler has the advantages that stable and gentle temperature gradient descent of slag ash can be guaranteed by primary air cooling of the jacket type air-cool spiral conveyor and secondary water cooling of the drum type slag cooling assembly, and accordingly the problems of great local temperature variation of spiral blades in existing jacket type air-cool spiral conveyors during irregular interval slag discharge and locking of the spiral blades and the inner wall of air-cool jackets after the spiral blades are thermally expanded can assuredly solved; designed spiral slag breaking hinges can roll in circumferential surfaces of rotary drums along with rotation of the rotary drums, accordingly, slag on the inner walls of the rotary drums can be cleaned in cycles, and reduction of heat conductivity coefficients of the rotary drums and local high-temperature deformation of the rotary drums can be prevented.

The invention discloses a device and a method for reducing generation of 4H-SiC polymorphic defects, and belongs to the field of crystal growth devices. The crystal growth device solves the problems that an existing crystal growth device for growing 4H-SiC crystals is prone to generating multiple crystal forms in the crystal growth process, and the crystal growth quality is poor. The device comprises a crucible upper cover, an outer crucible, an inner crucible, a connecting plate, a supporting table, an induction coil and a quartz tube, the outer crucible is arranged on the upper side of the supporting table, the inner crucible is sleeved with the outer crucible, the crucible upper cover is arranged on the outer crucible, seed crystals are arranged on the inner wall of the crucible upper cover, the inner crucible is filled with raw materials, the inner crucible is arranged on the connecting plate, the connecting plate is in threaded connection with the threaded rod, the threaded rod is arranged in the supporting table and penetrates through the connecting plate to be connected with the inner crucible, the supporting table and the outer crucible are arranged in the quartz tube, and the induction coil is arranged on the outer side of the quartz tube. According to the crystal growth device and method, the stable crystal growth rate is realized, and the generation of crystal growth defects is reduced.