44results about How to "Reduce pressure resistance requirements" patented technology

The invention relates to a method for preparing pure-phase gamma-AlON transparent ceramic powder by carbothermal reduction of gamma-Al2O3, and belongs to the field of preparation of transparent ceramic materials. According to the preparation method, nano-alpha-Al2O3 and activated carbon are taken as raw materials; powder is filled in a graphite crucible loosely, wherein an aluminum oxide plate is paved at the bottom of the graphite crucible; an air hole which penetrates through the powder is preformed at the aluminum oxide plate; a graphite cover provided with fine and dense air holes is used for covering the hole; the pure-phase gamma-AlON transparent ceramic powder is prepared by adopting a two-step heating process in a flowing nitrogen environment with a micro positive pressure. By the adoption of the preparation method, the vacuumizing difficulty can be effectively reduced, powder is prevented from scattering in a vacuumizing stage, the time required for discharging adsorbed gas can be greatly shortened, the vacuumizing speed is high, and the preparation efficiency of the gamma-AlON powder is greatly improved; the obtained gamma-AlON powder phase has stable and reliable compositions and can be used for pressure-less sintering preparation of AlON transparent ceramics with high transmittance; the process is simple and is easy to operate, and is suitable for industrial production.

The invention relates to the field of lithium ion batteries, in particular to a method for greatly improving the excellent electrochemical performance of positive electrode materials LiFePO4 of low-temperature hydrothermal synthesized lithium ion batteries. The method solves the problems that the hydrothermal synthesized LiFePO4 with excellent electrochemical performance needs high temperature conditions and expensive surfactants, and the yield in unit volume is too low. According to the method, lithium salts, ferric salts and phosphoric acid are prepared into paste precursors in water according to a certain addition sequence and a certain mixture ratio, then, a certain number of organic solvents are added, and next, the nanometer LiFePO4 positive electrode materials with excellent electrochemical performance are prepared under the hydrothermal conditions. The LiFePO4 positive electrode materials with the excellent electrochemical performance can be prepared at lower temperature, so the pressure-proof performance requirement on a hydrothermal reaction kettle is greatly reduced. The method has the advantages that through changing the addition sequences of raw materials, the precursors are changed from the sticky state into the slurry state and are not sticky, so more raw materials can be fed into the reaction kettle, and the yield of LiFePO4 powder in the unit volume is greatly improved.

The invention discloses a gas replacement method and device used for a rigid container and based on a quantitative gas extracting-inflating technology. According to the gas replacement method, the pressure intensity is taken as a quantitative index, 1 / 2 of gas in the container is extracted from the rigid container once, and the container is filled with raw material gas with the same amount as the extracted gas, wherein components of the raw material gas are different from those of the extracted gas, or the component proportion of the raw material gas is different from that of the extracted gas; the gas is extracted and inflated for one or more rounds to enable the components of the gas in the rigid container to reach a quantitative value, and the components of the gas are slightly adjusted and replenished, so that a gas-phase space of the rigid container can be filled up with mixed gas or one high-purity gas with required component concentration. The gas replacement method is suitable for replacing gas in rigid containers with various characters and different sizes, particularly rigid containers with relatively low pressure resistance. The gas replacement device can be an automatic gas replacement device or a manual gas replacement device, and comprises basic assemblies such as the rigid container, a gas extracting and gas uniform-mixing assembly, a raw material gas inflating assembly and a pressure detection or sensing assembly.

The invention relates to the field of power electronics, in particular to a multi-stage single switch boost converter which is composed of a Boost circuit and a plurality of Switch-Capacitor networks. Voltages supplied by all the Switch-Capacitor networks are equal. Accumulation of the network voltages is achieved in an interleaving series connection mode, an output voltage is boosted, and the capacity of boosting is high. The converter is provided with only one active switch element, a control circuit is simple, and voltage stress of a switching tube is small and 1 / (1-D) times that of an input voltage. Capacitor voltages of all the Switch-Capacitor networks are equal and 1 / (1-D) times that of the input voltage, stress of the capacitor voltages is small, therefore, the size of the circuit is reduced, and integration is easy.

The invention relates to a method for preparing arylamine compounds by the catalytic hydrogenation of arene nitro compounds in a H2O-CO2 system, wherein H2O-CO2 is taken as reaction medium, and the arylamine compounds are prepared by the selective hydrogenation of the arene nitro compounds(ANCs) at a low temperature(between 25 and 100 DEG C), and the catalytic process is controllable, highly efficient and green. Under the action of supported metal catalysts, the existence of CO2 obviously increases the hydrogenation speed of -NO2 base groups of ANCs in the H2O phase and inhibits the generation of byproducts; the selectivity of target products is more than 99 percent; the hydrogenation speed increases along with the pressure increase of CO2. The effect of CO2 is quite obvious when the pressure of CO2 is less than the range of the critical pressure, and by adjusting the pressure of CO2, the adjustment and control of the speed of the strongly exothermic reaction of the hydrogenation of ANCs are realized; moreover, the reaction in the H2O phase is easy to realize the even distribution of the reaction heat, the added H2O and CO2 both have inflaming retarding characteristics, thereby lowering the risk of explosion, etc.

The invention relates to a solid oxide fuel cell (SOFC) coke oven gas power generation process and device. The process comprises the following steps of (A) pressurizing air and then making the air enter an SOFC cell stack after heat exchange; and (B) pressurizing coke oven gas and then making the coke oven gas enter a desulfurization device to remove hydrogen sulfide gas in the coke oven gas, carrying out methane reforming in a methane steam reformer at 700-1000 DEG C, converting the methane into carbon monoxide, hydrogen and a small amount of carbon dioxide, and sending the reformed airflow containing the hydrogen, the carbon monoxide, a small amount of carbon dioxide and the water vapor into the SOFC fuel cell stack in order to react with the air to generate electric energy.

The invention provides a digital signal isolator comprising a coding unit, a CMOS micro voltage transformer unit group and a decoding unit, wherein the coding unit is used for subjecting input signalsto edge detection, edge information of filtered and shaped signals can be extracted from the input signals, the extracted edge information is converted into coded pulse signals, the CMOS micro voltage transformer unit group is used for coupled transmission of the coded pulse signals, the CMOS micro voltage transformer unit group comprises at least two cascade cascaded CMOS micro voltage transformer units that are connected with each other via bonding wires, one end of a first CMOS micro voltage transformer unit in the CMOS micro voltage transformer unit group is connected with an output portof the coding unit, one end of a last CMOS micro voltage transformer unit is connected with an input port of the decoding unit, and the decoding unit is used for decoding coupled signals. Via application of the digital signal isolator, functions of a digital isolator can be fulfilled while technological difficulty and manufacture costs can be lowered.

The embodiment of the invention discloses a breaking device and an inverter system which are used for cutting off electrical connection when a fault occurs in a protected circuit. The breaking deviceis connected in series with the protected circuit and is used for cutting off the electrical connection when the fault occurs in the protected circuit. The breaking device comprises a first branch, asecond branch and a controller, wherein the first branch comprises an overcurrent automatic breaking unit and a first current limiting unit, the overcurrent automatic breaking unit is used for automatically breaking when a passing current exceeds a breaking current threshold, the first current limiting unit is used for limiting a current on the first branch, the second branch is connected in parallel with the first branch and comprises a first controllable switch unit, a control end of the first controllable switch unit is connected with the controller and is used for breaking or attracting under control of the controller, and the controller is connected with the control end of the first controllable switch unit and the protected circuit and is used for controlling the first controllable switch unit to attract under normal working of the protected circuit and controlling the first controllable switch unit to break when the fault occurs in the protected circuit.

The invention discloses a preparation method of deuteroethylene. According to the preparation method, calcium carbide is reacted with D2O to generate deuteroacetylene; a deuteration reaction is performed on the prepared deuteroacetylene and deuterium gas in the presence of a composite catalyst Cu-Ni / SiO2 to obtain the deuteroethylene; the volume ratio of the deuteroacetylene to the deuterium gas is 1: (10-60). The preparation method of the deuteroethylene is applicable to industrial production and has been verified and utilized in an industrial pilot plant already; experimental results prove that the preparation method has the advantages of simple reaction steps, mild reaction conditions, high deuteroethylene yield, recyclability of superfluous deuterium gas in the reaction as the raw material, and great reduction of the production cost.

The invention relates to a catalyst preparation technology, and aims to provide a preparation method of a catalyst for preparation of FDCA (2,5-furandicarboxylic acid) through catalytic oxidation of HMF (5-hydroxymethylfurfural), and application of the catalyst. The application method comprises the following steps: adding HMF and potassium ferrate into a reaction container; adding deionized water,NaOH and K2HPO4 into a flask, and reacting under the condition of 25 DEG C for 15 minutes, wherein after the reaction, the solution is pasty; filtering to obtain filtrate, and adding concentrated hydrochloric acid into the filtrate dropwise until a large amount of white precipitate is generated; and filtering, putting solid substances into a drying box at the temperature of 50 DEG C and drying for 24 hours to obtain a white product, namely the 2,5-furandicarboxylic acid. The catalytic cost of the potassium ferrate is lower relative to that of noble metal, and the reduction product of the potassium ferrate after reaction is ferric oxide hydrate which is environmentally friendly, is a green product and avoids pollution. Through control of the alkaline condition of the system and the use amount of the buffer solution K2HPO4, the stability of the potassium ferrate can be improved and efficient preparation is realized.

The invention discloses a three-phase interleaved buck PFC circuit and a control method thereof. The three-phase interleaved buck PFC circuit adopts interleaved parallel circuits, a step-down inductorand a filter capacitor are arranged, PID control is carried out on the capacitor voltage outer loop and the inductor current inner loop through the main controller, feedforward control operation is carried out at the same time, PWM control signals are obtained to control the switch tube, the size of the capacitor and the inductor of the circuit is reduced, the single capacity requirement of the switch tube is small, power grid current harmonic waves are reduced, cost is reduced, and therefore the power factor of a power grid is improved.

The invention relates to thermosetting epoxy resin under the microwave condition and a degradation method of a composite material of the thermosetting epoxy resin in an ionic liquid, and belongs to the field of microwave irradiation technology and resource utilization of waste resin materials. Imidazole salt, pyridine salt, piperidine salt or quaternary ammonium salt ionic liquid is adopted as a reaction medium, and the reaction conditions are moderate. By a microwave heating method, the energy consumption for the degradation reaction is reduced, the degradation reaction time is shortened, and degradation products generate more bisphenol A monomers; the used ionic liquid can be recycled; and the method provides help for recycling of waste circuit boards and 'energy saving and emission reduction' industrialization.

The invention discloses an ion chromatography single pump-column switching system for detecting trace inorganic anions in weak-acid salt. The ion chromatography single pump-column switching system comprises a sample injection bottle, a quantitative ring, a first waste liquid bottle, an ion exclusion column, a high pressure infusion pump, a leacheate generator, an anion exchange chromatographic column, an anion suppressor, an electrical conductivity detector, a collecting pipe, a second waste liquid bottle, a six-way valve and a ten-way valve, wherein the leacheate generator is provided with an electrolysis device provided with a switch, the connecting sequence of adjacent joints of the six-way valve and the ten-way valve is adjusted, the ten-way valve and the six-way valve can form a loading mode and a sample injection mode respectively, and further the system forms four connecting states, the states of the system are adjusted according to the change of the state A, the state B, the state C, the state B, the state D and the state C. The invention also discloses a method used for detecting the trace inorganic anions in the weak-acid salt. The ion chromatography single pump-column switching system disclosed by the invention has the advantages that the interference generated by a high-concentration weak-acid anion structure can be effectively eliminated, and the determination of the trace inorganic anions in the weak-acid salt can be realized.

The invention discloses a rigid container gas mixing device and method based on a built-in soft container. The rigid container gas mixing device comprises a rigid container, a raw gas input assembly and a gas circulating assembly, wherein an exhaust valve is arranged on the rigid container; the built-in soft container is arranged in the rigid container; a fluid charging and discharging assembly is connected outside the built-in soft container; the built-in soft container fills the internal space of the rigid container when being full of fluid; the raw gas input assembly and the gas circulating assembly are connected with the rigid container, respectively. The device has the advantages of being energy-saving, time-saving, safe, reliable, simple in structure, low in cost and high in applicability. The gas mixing method comprises the following steps: (1) starting the exhaust valve; (2) starting the fluid charging and discharge assembly; (3) starting the raw gas input assembly; (4) cutting off the raw gas input assembly; and (5) starting the gas circulating assembly for mixing the raw gas in the rigid container fully. The method has the advantages of high mixing efficiency and high mixing precision.

The invention provides a lightning protection device and an inverter, the lightning protection device comprises a first overvoltage protector and a second overvoltage protector which are connected inseries between a protected line and the ground, the first overvoltage protector is connected with the protected line, and the second overvoltage protector is grounded. Moreover, the lightning protection device also comprises a voltage regulation circuit, and the voltage regulation circuit at least comprises a first voltage division circuit which is connected in parallel with the two ends of the second overvoltage protector. When the lightning protection device is in a normal working condition, the first voltage division circuit is used for adjusting the voltage drop of the first overvoltage protector or the second overvoltage protector. By adjusting the impedance value of the first voltage division circuit, the voltage drop on the second overvoltage protector (or the first overvoltage protector) is reduced, so that the voltage withstanding performance requirement of the second overvoltage protector (or the first overvoltage protector) is reduced, and the hardware cost of the lightningprotection device is further reduced.

The invention discloses a water tank and a water heater with the water tank. The water tank is an open water tank. The forming position of a user water returning opening of the water tank is higher than the forming position of a user water taking opening and higher than the half position of the water tank, and the forming position of the user water taking opening is higher than the forming position of a hot water inlet and the forming position of a circulation water outlet. The water tank further comprises a water level inducting device arranged in the water tank and a water replenishing control device, wherein the water replenishing control device is in communication connection with the water level inducting device and is used for controlling a user water supply pipe to be opened or closed. In this way, according to the water tank, the interior of the water tank is always in the high water level state by controlling the water level, convection heat exchanging between water in the upper portion of the water tank and water in the lower portion of the water tank can be reduced, more obvious cold and hot water layering can be formed accordingly, and the amount of produced hot water and the water using comfort degree are increased; and meanwhile the maintaining cost of the water tank is reduced, and the aims of saving energy and reducing the use cost are achieved. The invention further provides the water heater with the water tank.

The invention discloses normal-pressure superheated steam using carbonization and pyrolysis equipment. The normal-pressure superheated steam using carbonization and pyrolysis equipment comprises a carbonization reactor, wherein a first gas inlet for injecting superheated steam and a first gas outlet for discharging the steam are formed in the carbonization reactor; the first gas inlet is communicated with a gas inlet pipeline; the first gas outlet is communicated with a gas outlet pipeline; a superheated steam generation mechanism is arranged between the first gas inlet and the first gas outlet; the superheated steam generation mechanism comprises a first heat exchanger with a gas outlet communicated with the gas inlet pipeline, a reheating electromagnetic coil arranged on the gas inlet pipeline and a steam generator with a gas outlet communicated with a gas inlet of the first heat exchanger; the first heat exchanger is arranged on the gas outlet pipeline. On one hand, the normal-pressure superheated steam using carbonization and pyrolysis equipment can work and operate at a normal pressure, so that the cost of purchasing the equipment is reduced; on the other hand, the waste heatof exhaust gas can be recycled, so that the aims of saving energy and reducing consumption are fulfilled.

The invention relates to technologies of polyester preparation by means of biomass, and provides a method for preparing polyhexylene 2,5-furandicarboxylate (PHF) by means of biomass. The method comprises the steps that 1,6-HDO and FDCA are subjected to esterification reaction to generate oligomer, through condensation polymerization, high polymer is obtained, and through purification, a product PHF is obtained; the FDCA is obtained by using potassium ferrate as a catalyst for catalyzing an oxidized woody biomass based platform chemical compound HMF. According to the method, the FDCA and the 1,6-HDO are used as raw materials, and both the FDCA and the 1,6-HDO are environmentally friendly and come from the biomass, so that green and economic preparation of the PHF is achieved; the method hasthe advantages of being low in catalyst cost, environmentally friendly and pollution-free; the reaction system of a catalyst promoter and the potassium ferrate / sodium hydroxide / dipotassium phosphategenerates a synergistic effect, so that the yield of the FDCA is improved; butyl titanate can not only be used as a catalyst of the esterification reaction, but also be used as a catalyst of condensation polymerization, so that one-time adding in a reaction process is achieved, experimental operation is made simple, convenient and safe, and the synthesis efficiency is high.

The invention relates to a method for producing diethyl isophthalate. The method is characterized in that: m-phthalic acid and ethanol as raw material and concentrated sulfuric acid as a catalyzer are mixed according to a molar ratio of 1 to 3.7-4.0 to 0.011-0.014, thrown into a reaction kettle, fully and evenly stirred, then subject to heating, pressure maintaining, distillation, neutralization and rectification, thereby obtaining a product of the diethyl isophthalate. In the invention, the temperature of the whole production process is less than or equal to 170 DEG C; the method has low reaction temperature and short esterification time, thereby reducing energy consumption, saving energy and having low requirement on the pressure resistance of equipment and low production cost.

The present invention discloses an acetal preparation method, which comprises: 1, adding a copper-based salt to ethanol to make the ethanol be subjected to a dehydrogenation reaction so as to obtain acetaldehyde; 2, adding the prepared acetaldehyde to an enamel reaction pot while adding hydrogen chloride to make the acetaldehyde be subjected to a polymerization reaction so as to generate acetal, wherein the polymerization reaction is performed for 4 h at a temperature of 30-35 DEG C under the effect of external circulation cooling water; and 3, washing the reaction solution by using an alkali liquid so as to prepare the crude acetal. According to the present invention, with the method, the acetal production efficiency is improved; the requirements on the pressure resistance of the reaction container are reduced so as to reduce the enterprise production cost; the copper acetate is used as the precursor for producing the copper active ingredient and has the good selectivity of the catalytic activity, such that the yield of the obtained acetal is high; and the single food-grade ethanol is adopted as the raw material, such that the whole production process has the characteristics of environmental protection and no pollution, and the sustainable development of ecology is easily achieved.

The invention discloses gas of a gas spacer, and relates to the field of gas spacers. The gas comprises acetone and a non-combustible refrigerant which is gaseous at normal temperature and normal pressure; and the acetone and the refrigerant are mixed in a liquid form in a pressure vessel and are not combustible in the release (vaporization) process. The gas has the advantages of simple proportioning, low cost, convenience in use, capability of greatly reducing the pressure of compressed gas in a gas tank, incombustibility and the like.

The invention provides a kind of dimethyl isophthalate and production method thereof, described production method, comprises reaction, dealcoholization, alkali washing and rectifying steps; Described reaction, take reactant and catalyzer, reaction temperature is 100 -130°C, the pressure is 0.2-0.6MPa; the reactants are isophthalic acid and methanol, and the mass ratio of the isophthalic acid, methanol and catalyst is 1:3-4:0.001-0.003; the present invention method, the reaction temperature of the whole production process is low and the esterification time is short, which reduces energy consumption and saves energy; the dimethyl isophthalate produced by the production method of the present invention has a purity of ≥99.7%, a moisture content of ≤1000ppm, and an acid value of ≤0.1KOH / g.

The invention relates to the field of lithium ion batteries, in particular to a method for greatly improving the excellent electrochemical performance of positive electrode materials LiFePO4 of low-temperature hydrothermal synthesized lithium ion batteries. The method solves the problems that the hydrothermal synthesized LiFePO4 with excellent electrochemical performance needs high temperature conditions and expensive surfactants, and the yield in unit volume is too low. According to the method, lithium salts, ferric salts and phosphoric acid are prepared into paste precursors in water according to a certain addition sequence and a certain mixture ratio, then, a certain number of organic solvents are added, and next, the nanometer LiFePO4 positive electrode materials with excellent electrochemical performance are prepared under the hydrothermal conditions. The LiFePO4 positive electrode materials with the excellent electrochemical performance can be prepared at lower temperature, so the pressure-proof performance requirement on a hydrothermal reaction kettle is greatly reduced. The method has the advantages that through changing the addition sequences of raw materials, the precursors are changed from the sticky state into the slurry state and are not sticky, so more raw materials can be fed into the reaction kettle, and the yield of LiFePO4 powder in the unit volume is greatly improved.

The invention discloses a high-pressure-resistant large-flow miniaturized gas booster pump which comprises an electrical system and a circulating pump cavity, wherein the electrical system is connected with the circulating pump cavity through a connecting part, the circulating pump cavity comprises a shell, a plunger pump is arranged in the shell, a cavity gas inlet and a cavity gas outlet are formed in the shell, a plunger pump gas outlet extends out of the shell, and the cavity gas outlet is connected with a plunger pump gas inlet, so that the input gas pressure of the plunger pump is equalto the internal gas pressure of the shell. The high-pressure-resistant large-flow miniaturized gas booster pump has the characteristics of being small in size, light in weight and low in power consumption. The high-pressure-resistant large-flow miniaturized gas booster pump has wide application prospects in the fields of chemical engineering, aerospace, fire protection and the like.

The invention discloses a drive circuit for a direct-current motor. The drive circuit comprises an H bridge drive circuit, voltage stabilizing circuits and PWM (Pulse-Width Modulation) drive circuit, wherein the voltage stabilizing circuits comprise a negative voltage stabilizing circuit and a positive voltage stabilizing circuit; the negative voltage stabilizing circuit outputs a voltage with fixed voltage difference relative to the power supply voltage of the system, and is used for generating drive voltage for conducting a P-type MOS (Metal Oxide Semiconductor) tube; the positive voltage stabilizing circuit is used for the drive circuit for conducting a N-type MOS tube; and the PWM drive circuit comprises an upper bridge arm PWM drive circuit and a lower bridge arm PWM drive circuit. The drive circuit for the direct-current motor is not provided with a charge pump, thus, high voltage and oscillation caused by the charge pump is avoided, requirements to voltage resistance performance of a drive circuit chip are reduced, and electromagnetic compatibility of the whole circuit is improved.