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

The invention relates to a solid oxide fuel cell (SOFC) coke oven gas power generation process and device. The process includes: (A) pressurizing the air, and then entering the SOFC battery stack after heat exchange; (B) putting the coke oven After the gas is pressurized, it enters the desulfurization device to remove the hydrogen sulfide gas in the coke oven gas, and then sends it to the methane steam reformer for methane reforming at 700‑1000 ° C, converting methane into carbon monoxide, hydrogen and a small amount of carbon dioxide. The reformed gas stream containing hydrogen, carbon monoxide, a small amount of carbon dioxide and water vapor is sent to the SOFC fuel cell stack to chemically react with the above-mentioned air to generate electricity.

The invention relates to a balancing device and an energy storage system containing the balancing device, wherein the balancing device includes a controller, and a power conversion module, a current control module and a switch array connected in sequence, and the input end of the power conversion module is connected to a balanced power supply, The switch array is connected to the battery pack, and the current control module controls the current between the power conversion module and the switch array; the switch array includes a plurality of first relays, and each first relay is connected to each battery string of the plurality of battery packs in a one-to-one correspondence. Compared with the prior art, the present invention can achieve a significant increase in the number of battery strings supported by a power conversion module, not only can significantly reduce the cost in large-scale energy storage systems, but also can accurately control the battery strings in a certain battery pack for precise equalization.

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 discloses multi-scale spray haze removal equipment, which comprises a host and a spray component. The host is internally provided with a water supply system and an air supply system. Thewater supply system purifies and pressurizes the water entering the host, and the air supply system purifies and pressurizes the air entering the host. The spray component includes a spray water pipe, a spray air pipe and a plurality of nozzles, the spray water pipe is connected to the water outlet end of the water supply system, the spray air pipe is connected to the air outlet end of the air supply system, and each nozzle is communicated with the spray water pipe and spray air pipe. The equipment provided by the invention adopts gas-liquid two-phase spray, the formed water mist has small granularity, and adjustment and switching of multiscale hyperfine spray water mist of different particle sizes can be realized conveniently, the haze removal effect is good, also the water supply and air supply pipelines belong to low pressure system, the requirement for the pressure resistance of the pipelines is low, the equipment has no risk, and the later pipeline maintenance cost is low.

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 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 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.

The embodiment of the present application discloses a breaking device and an inverter system, which are used to cut off the electrical connection when the protected circuit fails. The breaking device is connected in series in the protected circuit, and is used to cut off the electrical connection when the protected circuit fails; The automatic breaking unit is used to automatically disconnect when the flowing current exceeds the breaking current threshold, the first current limiting unit is used to limit the current on the first branch; the second branch connected in parallel with the first branch includes The first controllable switch unit, the control end of which is connected to the controller, is used to disconnect or pull in under the control of the controller; the controller is connected to the control end of the first controllable switch unit and the protected circuit, It is used to control the first controllable switch unit to turn on when the protected circuit is working normally, and to control the first controllable switch unit to turn off when the protected circuit fails.