39results about How to "Reduced resistance pressure drop" patented technology

The invention discloses a light-transmitting, breathable and static electricity repellent PM2.5 air filter membrane and the preparation method thereof. The air filter membrane is characterized by being provided with at least one layer of non-woven fabric base material or screen net and at least one layer of ultrathin electrostatic spinning nano fiber layer. The preparation method comprises the steps of impregnating the non-woven fabric base material, the screen net or the ultrathin electrostatic spinning nano fiber layer in a tourmaline nano-particle containing suspension or spraying the tourmaline-containing nano particle suspension on the on-woven fabric base material, the screen net or the ultrathin electrostatic spinning nano fiber layer and drying, wherein the mass percentage of tourmaline nano particles in the suspension is 1-30%, the suspension further comprises a bonding agent, so that the tourmaline nano particles can be wrapped on the surface of the non-woven fabric base material, the screen net or the ultrathin electrostatic spinning nano fiber layer. The air filter membrane applied in a window screen is prepared by adopting the nano fiber technique and electrostatic repulsion and fine particulate matter PM2.5 is guaranteed to be blocked outside when a window is opened for ventilation.

The invention relates to a high-efficiency and low-resistance nanofiber air filtering material for a gauze mask and a preparation method of the filtering material. According to the preparation method, by virtue of a steam field compensation and control technology, an equal-electric voltage spinning technology and a nanofiber structure with a bead structure and innovatively introducing single fibers in an electrostatic spinning process, the high-efficiency and low-resistance nanofiber air filtering material which is free of adhesion between fibers and fluffy in structure, has a three-dimensional cavity and is in a net communication structure is obtained in a one-step molding manner. According to the high-efficiency and low-resistance nanofiber air filtering material for the gauze mask, the filtering efficiency on granules which are 0.006-2.5 microns can reach over 99.999%; and the piezoresistance is less than 30Pa. The high-efficiency and low-resistance nanofiber air filtering material is simple in preparation technology, low in cost, high in filtering efficiency and small in resistance pressure drop, and has a wide application prospect in the field of individual protective masks.

The invention relates to a three-dimensional zigzag nanofiber compound window screen and an electrostatic spinning method thereof. A zigzag template receiving technique, a needle head three-dimensional arrangement technique and a gradient electric field circulation spinning technique are adopted during an electrostatic spinning process so as to obtain a three-dimensional zigzag nanofiber compound film having an adhesive-fluffy stacked structure, i.e., the three-dimensional zigzag nanofiber compound window screen; the three-dimensional nanofiber compound window screen is characterized in that the gram weight is 0.01-70 g/m2, the efficiency for filtering particles having the diameter of 0.006-1 [mu]m is greater than or equal to 80%, the resistance pressure drop is less than 25 Pa, and the light transmittance is 30-90%. The three-dimensional nanofiber compound window screen is simple in preparation process, is low in cost, is high in filtering efficiency, is low in resistance pressure drop, and has wide application prospect in the fields of individual protection and indoor air purification.

The invention belongs to the field of textile materials and discloses a micron fiber three-dimensional framework/polymer nanofiber composite filter material and a preparation method thereof. The preparation method comprises the following steps: preparing polymer nanofibers by adopting a melt blending method; dispersing the polymer nanofibers and a crosslinking agent into a solvent to form a suspension, then soaking micron fiber nonwoven fabric skeletons into the suspension, carrying out freeze drying to form coagulation blocks, and then removing the solvent, so that a nonwoven material with polymer nanofiber aerogel gradiently distributed among the micron fiber nonwoven fabric skeletons is obtained. According to the invention, the adopted preparation technology is simple, raw materials are environment-friendly, conditions are mild, the composite filter material is applicable to industrialized mass production, and the composite filter material product has good flexibility as well as high efficiency and low resistance air filtration performance and can be applied to the field of efficient air purification.

The invention provides a composite filtering material and a preparation method thereof. The composite filtering material is prepared by sequentially depositing and compounding fiber filtering layers from micron to submicron and then from micron to nanometer, and comprises a non-woven fabric primary-effect filter layer, a porous micro-nano fiber medium-effect filter layer, a cobweb nano fiber high-efficiency filter layer and a composite layer which is arranged between the adjacent filter layers and formed by fibers in the adjacent filter layers in an interpenetrating manner. The preparation method comprises the following steps: firstly, preparing the non-woven fabric primary-effect filter layer by using a plane receiving type centrifugal spinning process, and then sequentially receiving anddepositing the porous micro-nano fiber medium-effect filter layer and the cobweb nano fiber high-efficiency filter layer on the surface of the non-woven fabric primary-effect filter layer by using anelectrostatic spinning process to prepare the multi-stage structure composite filter material with the pore diameter changing along the thickness direction in a gradient manner. The composite filtering material not only has excellent air filtering performance, but also has photocatalysis and antibacterial performance.

The invention provides a functional filter material capable of releasing a far infrared ray and a preparation method thereof. The functional filter material capable of releasing the far infrared ray is characterized by comprising a base material and a nanofiber membrane arranged on the base material, the nanofiber membrane comprises at least one level unit, each level unit comprises a plane layer formed by nanofiber disordered gathering and a cavity structure formed by directionally arranging and stacking nanofiber, some or all cavity structures are filled with substances capable of releasing the far infrared ray, and the nanofiber is mixed with the substances capable of releasing the far infrared ray. The functional filter material capable of releasing the far infrared ray has the advantages of being high in filter efficiency, large in resistance pressure drop, high in far infrared emissivity and the like, and has the wide application prospect in the field of air filtering.

The invention discloses a novel blast furnace gas hydrolysis conversion tower, and belongs to the technical field of blast furnace gas hydrolysis towers. The tower comprises a hydrolysis tower shell, the bottom of the hydrolysis tower shell is connected with a coal gas inlet pipe, a filler module is arranged in the hydrolysis tower shell, a lower bracket plate is arranged at the bottom of the filler module, and a middle bracket plate is arranged on the outer ring of the middle of the filler module; an upper flow guide device is arranged at the upper part of the filler module; and an upper pipe orifice device is arranged at the top of the hydrolysis tower shell. The hydrolysis catalyst filler is modularized, the coal gas flow is guided by adopting newly developed tower internals so that the coal gas flow uniformly and slowly passes through the hydrolysis catalyst, the contact area and the contact time of the coal gas and the hydrolysis catalyst are ensured, the hydrolysis catalysis efficiency is greatly improved, and meanwhile, the coal gas resistance pressure drop is reduced, and the requirements of blast furnace gas hydrolysis conversion are met.

The invention discloses a novel blast furnace gas dechlorination and hydrolysis conversion integrated tower, and belongs to the technical field of blast furnace gas towers. The tower comprises a tower body shell, an inlet gas distribution pipe is arranged at the bottom of the tower body shell, a lower bracket plate is arranged at the bottom of the tower body shell, flow guide holes are formed in the plate face of the lower bracket plate at intervals, a middle bracket plate is arranged in the middle of the tower body shell, the middle bracket plate divides the interior of the tower body shell into a hydrolysis tower body and a dechlorination tower body, and filler modules are arranged in the hydrolysis tower body and the dechlorination tower body. The dechlorination and hydrolysis catalyst filler is modularized and convenient to mount and replace, the coal gas flow is guided by adopting a specific internal structure design, so that the coal gas flow passes through the dechlorination and hydrolysis catalyst sequentially, uniformly and slowly, the contact area and the contact time of the coal gas and the dechlorination and hydrolysis catalyst are ensured, and the resistance pressure drop of the coal gas is reduced while the dechlorination and hydrolysis catalysis efficiency is greatly improved.

The invention provides an electret nanofiber filtering material and a preparation method thereof, belongs to the technical field of new materials, and solves the technical problem of low filtering efficiency of fine particles in air due to unstable electret performance of the electret nanofiber filtering material in the prior art. The filtering material is prepared from a spinning solution throughelectrostatic spinning, and the spinning solution comprises the following components in parts by weight: 5-30 parts of a polymer, 1-10 parts of thiophene dipole molecules, and 60-94 parts of a solvent, wherein the thiophene dipole molecules are a compound with a dipole structure of an electron donor-pi conjugated system-electron acceptor. The thiophene dipole molecules and the polymer are dissolved together, the air filtering material with high PM2.5 filtering performance, low resistance pressure drop and ideal performance stability is prepared through an electrostatic spinning technology, and the air filtering material has the advantages of being simple in preparation method and low in production cost.