141results about How to "Small pressure drop loss" patented technology

The invention discloses a manufacture method of a molecular sieve honeycomb body for absorbing volatile organic compounds, which comprises the steps of: regulating 5-20 percent of ceramic fiber, 5-20 percent of adhesion agent, 5-15 percent of paper pulp and 60-80 percent of zeolite molecular sieve with water into a suspension with concentration of 2-10 percent; defibering and separating the suspension; then slowly stirring and adding poly dimethyl diallyl ammonium chloride, after flocculation occurs, adding anionic polyacrylamide and continuously stirring for 5-15 min and then making a paper plate; and making the made wet paper plate into a planar molecular sieve paper plate and a corrugated molecular sieve paper plate, and alternatively overlapping or coiling the planar molecular sieve paper plate and the corrugated molecular sieve paper plate into a honeycomb structure to obtain the molecular sieve honeycomb body. A zeolite molecular sieve provided by the invention is not easy to peel off, and is easy to process into various shapes; and the molecular sieve honeycomb body can absorb organic matters under different temperatures and humidities.

The invention discloses a stainless steel fiber felt used for fuel cell bipolar plates and a manufacturing method thereof, belonging to the technical field of fuel cell bipolar plate flow fields. The manufacturing method of stainless steel fiber mat can be divided into four steps: processing stainless steel fiber by cutting method, pretreatment of stainless steel fiber, molding of fiber mat, and high-temperature solid-state sintering. After the metal fibers are sintered, metallurgical bonding is achieved between the fibers, forming a large number of multi-scale pore structures. The manufactured stainless steel fiber felt has the advantages of high porosity, high specific surface area, good heat and mass transfer performance, surface hydrophobicity, simple manufacturing process and low cost. This method is applicable to manufacture various metal porous materials, and its pore size and porosity can be controlled.

The invention relates to a multitubular fixed bed reactor, which comprises at least one catalyst-loaded reaction tube longitudinally extending along a direction parallel to the axis of the reactor. The height of the reaction tube and the hydraulic diameter of the reaction tube's cross-section are in a ratio of 1-2000, preferably 10-1000, and more preferably 50-500. The reaction tube includes: one or more catalyst chambers, which are used for loading the catalyst to form a catalyst fixed bed; one or more inlet distribution chambers, which are used for leading a reactant flow into the reaction tube and distributing the reactant flow into the catalyst fixed bed; and one or more outlet collection chambers, which are used for collecting the reactant flow and leading the reactant flow out of the reaction tube. Specifically, through arrangement of the inlet distribution chamber(s) and the outlet collection chamber(s), the reactant flow passes through the catalyst fixed bed layer along a horizontal direction perpendicular to the axis of the reactor so as to contact the catalyst and react with the catalyst. The invention also relates to application of the multitubular fixed bed reactor in chemical reactions like endothermic or exothermic reaction.

The invention relates to a double dielectric barrier discharge device with a catalytic coating for waste gas treatment. The double dielectric barrier discharge device comprises a shell; a gas inlet and a gas outlet are formed in the two ends of the shell; a plurality of clamping grooves are formed in the side surface of the shell and are used for allowing plate electrodes and catalytic medium plates to be put in. The double dielectric barrier discharge device provided by the invention has the structure characteristic of plasma-catalytic module integration, is used for waste gas treatment and can not only realize plasma-catalytic efficient synergistic removal of volatile organic compounds, nitrogen oxides and other gaseous pollutants, but also realize the deep oxidation of the pollutants through catalyst formula adjustment aiming at different waste gas components; relative to a two-stage type plasma catalytic device, catalyst modules are reduced, the space is saved, and the pollutant removal efficiency is improved; relative to a traditional one-stage type plasma catalytic device, the caused airflow pressure drop is less, and the energy utilization efficiency is higher; when volatile organic waste gas is treated, the appearance of sediments on the inner wall of a discharge reactor can be effectively inhibited.

The invention provides a large-caliber heat-supply pipeline uncompensated cold mounting method, comprising the following steps: digging a groove for arranging a heat-supply pipeline, and filling sand into the groove; mounting the heat-supply pipeline and a corresponding pipeline accessory into the groove; carrying out backfilling on the groove; wherein, the direct-buried net depth of the heat-supply pipeline is more than 1.7m; the pipeline accessory comprises an elbow with a large bending radius, bevel angles, a three-way pipe, a tapered pipe, and a valve; wherein, the bevel angles comprise a plurality of small bevel angles smaller than 1 degree or the elbow the radius of which is more than 5.0DN can be used for replacing; moreover, the mounting method provided by the invention is led to be suitable for paving the heat-supply pipelines the main tubular diameters of which are more than DN1000 by the processing technology on each node of the pipeline; moreover, the invention is simple to be mounted, has short construction period, reduces the maintaining cost, and is safe and reliable.

A plate fin heat exchanger comprises a folded fin sheet comprising fins wherein the fin sheet comprises a plurality of perforations, such plurality of perforations are positioned on the fin sheet in parallel rows when such fin sheet is in an unfolded state, such parallel rows of perforations on the fin sheet comprise a first spacing between the parallel rows of perforations (S1), a second spacing between sequential perforations within the parallel row of perforations (S2), a third spacing (or offset) between the perforations in adjacent parallel rows of perforations (S3), and a perforation diameter (D), wherein the ratio of the first spacing between the parallel rows of perforations to the perforation diameter (S1/D) is in the range of 0.75 to 2.0, and wherein the angle between the fins and the parallel rows of perforations is less than or equal to five degrees (= 5 DEG ).

The invention relates to a heating method of ethyl benzene of an ethyl benzene dehydrogenation reaction material, which mainly solves the problems of frequent accidents of the combined heat exchanger, difficult long-period and stable running, large pressure drop in the pipeline of a reactive system and inadequate heat recovery of a reactor charging/discharging three-level combined heat exchanger in the traditional styrene device due to the unreasonable flow for heating the ethyl benzene by utilizing the discharging of the high temperature reactor. The invention adopts the technical proposals that a liquid phase ethyl benzene material and ingredient water vapor are firstly vaporized to a gas phase with a temperature of between 90 and 110 DEG C through an independently arranged evaporator, and then enter the third level shell pass of the reactor charging/discharging combined heat exchanger to be preheated to a temperature of between 200 and 250 DEG C and then enter the first level shell pass of the reactor charging/discharging combined heat exchanger for being super-heated to a temperature of between 450 and 550 DEG C by the discharging of the high temperature reactor, and the second level shell pass of the reactor charging/discharging combined heat exchanger is used for generating saturated water vapor with a pressure of between 400KPaA and 1000KPaA; and the reactor charging/discharging three-level combined heat exchanger adopts the horizontal or vertical straight-line type arrangement mode, a linear type pipeline expansion joint is disposed between an exit of a dehydrogenation reactor and a material inlet of the first level in the reactor charging super-heater, namely the three-level combined heat exchanger to maintain the shortest distance for allowing installation between the dehydrogenation reactor and the charging super-heater, thereby reducing the tube shell pass thermal expansion difference of the first level heat exchanger.

The invention belongs to the technical field of heat exchange of nuclear energy equipment, and particularly relates to a 0-shaped lead-bismuth heat exchange device which is a device for realizing flowing heat transfer at the two sides. Coolant flowing heat exchange channels are welded on outer peripheries of left and right annular casing pipes of a 0-shaped lead-bismuth alloy flowing channel, wherein the lead-bismuth alloy fluid flows in an inner tube, and the coolant flows in an external annular space channel; the lead-bismuth alloy exchanges heat with the coolant in the annular space channel while flowing through the device; and device transfers the heat to the coolant at a secondary loop through the liquid lead-bismuth alloy, thereby carrying away the heat of the lead-bismuth fluid. The device has two heat transfer flowing modes, namely forced circulation and natural circulation; the device has the characteristics of being simple in structure, low in manufacturing cost, good in heat exchange performance, small in pressure drop loss of the lead-bismuth fluid and having no limit on types of coolant and the like, so that the device is applicable to a lead-bismuth heat exchange system.

The invention provides a printed circuit board type fused salt heat exchanger adopting double-layer board arrangement. The printed circuit board type fused salt heat exchanger adopting double-layer board arrangement comprises a shell and a heat change board core arranged in the shell. The heat exchange board core comprises at least one periodical structure. Each periodic structure is composed of a first cold salt heat exchange board, a second cold salt heat exchange board and a hot salt heat exchange board, wherein the first cold salt heat exchange board, the second cold salt heat exchange board and the hot salt heat exchange board are sequentially stacked. Each first cold salt heat exchange board and each second cold salt heat exchange board are provided with multiple cold salt flow channels, wherein the flowing directions of the multiple cold salt flow channels are parallel. Each cold salt flow channel extends from the longitudinal first end of the corresponding cold salt heat exchange board to the longitudinal second end of the corresponding cold salt heat exchange board. Each hot salt heat exchange board is provided with multiple hot salt flow channels. Each hot salt flow channel extends from the transverse first end to the transverse second end of the corresponding hot salt heat exchange board. By the adoption of the printed circuit board type fused salt heat exchanger adopting double-layer board arrangement, it is avoided that fused salt causes blockage of the flow channels in a low-temperature environment, it is also avoided that in a high-temperature environment, the fused salt causes a thermal expansion effect on the flow channels of the heat exchanger, and the service life of heat exchange equipment is prolonged.

The invention discloses a wide-channel plate type heat exchanger and a heat exchanger particle swarm optimization structure design method, and belongs to the technical field of heat exchanger design.Six variables of a trapezoid boss on the surface of a single-layer heat exchange plate are extracted for forming structure parameters, and the design range is determined; an orthogonal method is adopted, and 25 sets of typical heat exchanger plates with different structures and operation conditions are generated; through Soliworks, the single-layer heat exchange plate is generated, and on the basis of Fluent numerical simulation software, a heat exchange nusselt number and the pressure drop of the corresponding heat exchanger plate structure are obtained; according to the obtained sample set,a heat exchange nusselt number and pressure drop comprehensive criterion relation model of a heat exchanger plate is fitted; the maximum heat exchange nusselt number and the minimum pressure drop serve as optimization targets, particle swarm optimization is adopted, and optimizing is carried out to obtain the structural parameters of the optimal heat exchanger plate; and the heat exchanger has theadvantages that the heat exchanger is suitable for finding shape parameters obviously affecting flowing and heat exchange characteristics of the plate type heat exchanger, under the condition that core parameters are continuously distributed, the shape parameter distribution range with the best heat exchange effect and meanwhile the minimum pressure drop losses can be searched.

The invention discloses glass fiber framework molecular sieve paper with a porous structure. The paper is prepared from, by mass, 70-80% of molecular sieves, 5-15% of glass fibers and 5-15% of silicondioxide. The invention also discloses a preparation method of the glass fiber framework molecular sieve paper with the porous structure. In the prepared glass fiber framework molecular sieve paper with the porous structured, the content of the molecular sieves reaches 75% or above, the content of adsorption materials is high, and the adsorption capacity in unit volume is large. The porous structure in the paper can obviously increase the specific surface area of the glass fiber framework molecular sieve paper, increase the contact area between the paper and organic waste gas and the adsorption capacity, prolong the service life, reduce the pressure drop loss and adapt to different temperature and humidity environments.

The invention discloses an electric split axial-flow type regulating valve. The electric split axial-flow type regulating valve is characterized in that a crank connecting rod mechanism composed of a regulating valve rod, a turning crank arm, a pull rod, a regulating disc and a valve core and a regulating locking mechanism composed of a regulating bolt, a locking bolt and a regulating disc are assembled in the split valve body. The electric split axial-flow type regulating valve is convenient to pull and regulate the sealing position when the valve core is closed so as to compensate the mounting size error generated by producing, assembling and overlapping components, the valve core is firmly locked after regulating, the sealing surface of the valve core is capable of closely fitting with the valve seat sealing surface to form a tight and effective sealing pair, and the cut-off sealing performance of the axial-flow type regulating valve is greatly improved under the closed state. The trial proves that the electric split axial-flow type regulating valve has prominent advantages of simple structure, low manufacturing cost, convenience in production, assembly and regulation, fast regulation reaction speed, stable running, small vibration noise, large flow rate, small pressure drop and high cut-off sealing performance under closed state, and the electric split axial-flow type regulating valve is especially suitable for conveying pipelines of the petrochemical industry.

The invention relates to a grid plate type reciprocating compressor pipeline air flow pulsation attenuation device, the attenuation device includes a cylinder body, a pulsation attenuation chamber is formed inside the cylinder body, a head is provided at the front end of the cylinder body, and an inlet method is provided at the front end of the head Lan, the pulsation attenuation cavity is provided with a deflector grid, and the deflector grid is set as an inclined structure; the rear end and front end of the cylinder are set as a mutually symmetrical structure. It can solve the problems of airflow pulsation and impact vibration that exist in the prior art when large-scale reciprocating compressor units are sucked and exhausted, making it wide-band, small in size, convenient in processing, and high in efficiency; it is aimed at traditional airflow pulsation attenuators In particular, the ordinary buffer tank can significantly reduce the volume. Under the condition of producing the same pulsation suppression effect, the volume of the device is significantly reduced. Compared with the buffer tank with a perforated plate, the device can reduce the air flow pressure drop loss.

The invention relates to a regulating valve with double valve seats. The regulating valve comprises a bottom cover, a valve core, a valve body, a sealing packing material, a packing material washer, a packing gland, an upper guide sleeve, a valve rod, a positioning pin, an upper valve seat, a lower valve seat and a connecting piece, wherein the valve body is a large valve cavity structure valve body with an upper valve seat insulating wall and a lower valve seat insulating wall; a double valve core structure of integrated same flow characteristic curve is adopted for the valve core; a double guide structure of two orientations at the upper guide sleeve and a valve body bottom part blank cap is adopted; balance holes are manufactured on the blank cap and the upper guide sleeve; and copper sleeves manufactured by adopting tin bronze is adopted for the embedding of the guide holes on the upper guide sleeve and the blank cap. The invention has the beneficial effects of less loss of pressure drop, large flow, wide adjustable extent, good action stability, and the regulating valve is especially suitable for the use of a pipeline system that the caliber is greater than DN 200, the front and rear pressure difference of the valve is great, the required rated flow is great, the leakage level requirement is low, and mediums have fine impurity working conditions.

The invention discloses a ship exhaust gas desulfurization device. The device comprises a desulfurization spray unit and pretreatment flues on both sides of the desulfurization spray unit. A pre-spraying layer is arranged in the pretreatment flue. A spraying layer is arranged in the desulfurization spray unit. A flow guiding unit for receiving exhaust gas from the pretreatment flue, uniformly distributing gas flows and feeding the gas flows into the spraying layer. The desulfurization spray unit is connected to a defogging unit for absorbing moisture of particles in the tail gas purified by the spraying layer and growing and separating the particles. The device has long gas-liquid contact time and high desulfurization efficiency and improves the space utilization rate of the ship.

The present invention relates to a catalyst for preparing vinyl acetate by using ethylene, acetic acid and oxygen gas or oxygen-containing gas as raw material and adopting gas-phase reaction. Its carrier is SiO2 or mixture of SiO2 and Al2O3, and the loaded active component contains Pd and KOAc, the active component is formed into egg-shell type non-uniform distribution, said catalyst is made into spherical granule, radium R of the sphere is 2-4 mm, and surrounding a central shaft of sphere, on the surface of the sphere 3-8 grooves whose cross-section is made into arched form are cut along the longitudinal direction, the groove is extended toward two ends of the central shaft from middle portion of the sphere and progressively exposed from surface of the sphere, and the distanced between grooves is greater than 1.5 mm. Said catalyst has high crushing strength, larger packing voidage and proper specific surface area.