39results about How to "Reduce hydrogen partial pressure" patented technology

The invention discloses a high-alkalinity high-tenacity low-hydrogen agglomerated flux, which comprises the following components by weight: 18-21.5% of MgO, 33-35% of CaF2, 15-20% of Al2O3, 17-21% of SiO2, 3.5-8% of CaO, 1-5% of MnO, 2-5% of BaCO3, and less than or equal to 3% of FeO, wherein the total weight of the components is 100%. The invention further discloses a preparation method of the high-alkalinity high-tenacity low-hydrogen agglomerated flux, which comprises the steps of: mixing the raw materials and performing dry agitation, adding sodium silicate that accounts for 20wt% of the mixed powder, performing wet agitation, sending the materials to a pelletizer to pelletize, entering into a drying furnace after being dried by hot wind, drying at 180-230 DEG C, screening after discharge and then entering into a sintering furnace, sintering in the sintering furnace at 830-860 DEG C and discharging, and finally, screening and cooling to obtain the high-alkalinity high-tenacity low-hydrogen agglomerated flux. The flux provided by the invention solves the problems that a current flux is poor in toughness of weld metal and high in diffusible hydrogen content in deposited metal.

An ultralow-hydrogen iron powder coated welding electrode for the high-strength low-alloy steel is composed of welding wire H08A or H08E and the coated layer prepared portionally from Fe powder, CaCO3, CaF2, Ti-Fe, feldspar, Mn powder, Ni powder, Cr-Fe, NaCO3 and sodium-water glass as adhesive.

The hydrogen permeating to a post-separation side (11B) of the membrane hydrogen separator (11) is supplied to an anode chamber (2A) of a fuel cell stack (2) via a hydrogen supply passage (25). A hydrogen recirculation passage (8) recirculates hydrogen from the anode chamber (2A) to the post-separation side (11B). When the hydrogen partial pressure on the post-separation side (11B) increases, air is introduced into the hydrogen recirculation passage (8) from an intake valve (30). When the hydrogen partial pressure decreases, gas in the hydrogen recirculation passage (8) is discharged from an exhaust valve (60). The rate of hydrogen permeation through the membrane hydrogen separator (11) is thereby maintained to a preferred level.

The invention discloses an aluminum alloy vacuum standing, gas removal and smelting device. The aluminum alloy vacuum standing, gas removal and smelting device mainly comprises a smelting furnace body consisting of a main furnace body and a vacuum cover which is matched with the main furnace body; and a gas extraction pipe is arranged on the smelting furnace body, one end of the gas extraction pipe is positioned in the vacuum cover, the other end of the gas extraction pipe is connected with a cooling pipe, and is connected with one end of the cooling pipe through a vacuum quick release flange, and the other end of the cooling pipe is connected with a vacuumizing pump. Before casting, the vacuumizing pump is started to vacuumize the furnace body, hydrogen partial pressure in a furnace cavity is reduced, and hydrogen is continuously separated out, so the hydrogen content of melt is reduced, and vacuum is removed for casting. After the gas of the aluminum alloy melt is removed, the tendency for absorbing hydrogen is low, so after casting, the smelt can keep low hydrogen content, and the defect of hole cannot be generated easily. The aluminum alloy vacuum standing, gas removal and smelting device has a simple structure and a good hydrogen removal effect, is easy to operate, and is suitable for producing an aluminum alloy casting of which holes are easily generated, or which has the high requirement of gas tightness.

The invention discloses an LNG structure as well as a nickel-based welding rod for marine 9Ni steel welding, and a preparation method thereof. The welding rod comprises a nickel-based welding core and a coating coated on the surface of the welding core, wherein the nickel-based welding core comprises the following chemical components with percentage contents: not greater than 0.10% of C, not greater than 0.10% of Si, not greater than 0.10% of Mn, not greater than 0.10% of Cu, not greater than 0.10% of Mg, not greater than 0.005% of S, not greater than 0.40% of Fe and not less than 99.5% of Ni+Co, and the total content of the components is 100%. The welding rod disclosed by the invention is high in manufacturability, and capable of being smoothly coated in a pressing manner during a production process, the coating of the welding rod is high in strength and good in surface quality, and the welding rod is controllable in core shift; and the chemical components of deposited metal meet standards, and weld metal is free from pores and cracks, high in normal-temperature tension and low-temperature toughness, good in mechanical property, and capable of being widely applied.

The invention relates to a method for preparing vanadium trioxide from a vanadium-containing solution. The method comprises the steps of introducing CO2 and H2 into the vanadium-containing solution, carrying out a reaction under heated and pressurized conditions, and carrying out solid-liquid separation after the reaction is completed, thereby obtaining solid vanadium trioxide and a separated solution. According to the method disclosed by the invention, the gas mixture of CO2 and H2 is adopted to react with the vanadium-containing solution, so that the technical problem that a reduction reaction is difficult to carry out due to the fact that sodium hydroxide is produced in a hydrogen gas reduction process of vanadate is solved; the efficiency of reduction of the vanadate is increased, and the vanadium trioxide product with the purity higher than 99% is obtained; and meanwhile, the generation of ammonia nitrogen wastewater is effectively avoided, the cyclic utilization of water resources is achieved, and the aim of zero wastewater emission is achieved. The method has the characteristics of short process flow, high production efficiency, high-end product, environment-friendliness, low cost and the like and is applicable to industrialized popularization.

The invention utilizes a flat plate photobioreactor integrating a fuel battery to integrate microalgae high-density culture and irradiation hydrogen production so as to form an integrative hydrogen production system. Two sections of processes of microalgae culture and photosynthetic hydrogen production are generally divided in space time, and the cultured low-density frustule needs to be concentrated and then irradiated to produce hydrogen, so that the operations need to be respectively carried out in two photobioreactors. In the microalgae hydrogen production of the invention, the low-density microalgae is inoculated into a reactor, a culture mode of enriching carbon dioxide is utilized, the biomass required by the hydrogen production can be reached by short-term culture, then dark induction is carried out, and the operation can enter a continuous irradiation hydrogen production stage. The generated hydrogen gas can be integrated into a fuel battery on a reactor and is converted into electric energy, and the hydrogen production condition can be monitored at real time by the change of current. The invention combines the two sections of processes of the microalgae culture and the hydrogen production for the first time, utilizes the fuel battery to convert the hydrogen into the electric energy and provides reliable technical support for the large-scale microalgae hydrogen production.

The invention relates to a methane two-phase anaerobic fermentation gas mixing system, which belongs to a methane generator. A gas returning pipe and a gas inlet pipe are connected and installed between a hydrolytic acidification tank and a gas production tank, the both ends of the gas returning pipe are respectively connected with the upper part of the hydrolytic acidification tank and the lower part of the gas production tank, the both ends of the gas inlet pipe are respectively connected with the lower part of the hydrolytic acidification tank and the upper part of the gas production tank; an air pump and a one-way valve are arranged on the gas inlet pipe; and a normally open solenoid valve is installed on a gas collector, and is positioned at the gas collector position between the hydrolytic acidification tank and the gas production tank. The system has the advantages that the structure is simple, the operation is convenient, the running is stable, the gas production process is smooth, the gas production rate is high, and the quality is good.

The invention belongs to the technical field of welding materials, and particularly relates to a nickel base alloy submerged arc welding sintered flux and a preparation method and application thereof.According to the nickel base alloy submerged arc welding sintered flux, a main slag system is mainly composed of a CaF2-MgO-Al2O3-CaO-BaF2-SiO2 system, and specifically comprises the following components of, by mass, 18-35 parts of CaF2, 9-33 parts of MgO, 16-28 parts of Al2O3, 8-12 parts of CaO, 4-15 parts of SiO2, 2-12 parts of BaF2, 0.5-5 parts of TiO2, 0.5-2 parts of ZrO2, 0.5-5 parts of alloy and 15-20 parts of sodium silicate. The flux provided by the invention is good in performance and low in diffusible hydrogen, is matched with a solid welding wire ERNiCrMo-4, and is good in manufacturability, and the weld metal mechanical performance is good.

A technology for preventing degradation of a hydrogen permeable metal layer in a fuel cell 210 is provided. A fuel cell system 200 including a fuel cell 210 with an anode which has the hydrogen permeable metal layer comprises a fuel cell controller 230 for controlling the operation status of the fuel cell system 200, a temperature parameter acquisition section for acquiring a temperature parameter of the hydrogen permeable metal layer, and a hydrogen permeable metal layer degradation prevention section which reduces the hydrogen partial pressure in an anode channel 212 for supplying fuel gas to the anode. If a temperature of the hydrogen permeable metal layer represented by the temperature parameter deviates from a specified temperature range, the fuel cell controller 230 cause the hydrogen permeable metal layer degradation prevention section to operate for preventing degradation of the hydrogen permeable metal layer.

A method of controlling a hydrogen partial pressure can be carried out in a fuel cell system including a stack having a hydrogen electrode and an air electrode. The method includes: determining a point of time to purge the hydrogen electrode using a hydrogen concentration at an outlet of the hydrogen electrode or an accumulated amount of charge generated in the stack; and setting a target supply pressure of hydrogen supplied to the stack, in which the target hydrogen supply pressure is set in consideration of a hydrogen pressure and a partial pressure of nitrogen resulting from crossover in the stack.

The present invention, coal tar hydrogenating process and catalyst, has obvious economic and environment protecting significance. Different hydrogenating catalysts are developed for meeting the requirement of hydrogenating coal tar of different components. The hydrogenating reactor has inlet pressure not higher than 15.0 MPa. After coal tar is hydrogenated in proper process to modify, may be obtained high-quality naphtha, high-quality diesel oil component or diesel oil, high-quality needle coke material and high-purity chemical product. The key point of the present invention is to use the developed special hydrogenating refining and modifying catalyst in hydrogenating coal tar.

The invention discloses a sewage treatment method for simultaneously producing nitrogen and removing nitrogen by biological hydrogen production, coupling and denitrification. The sewage treatment method for simultaneously producing nitrogen and removing nitrogen by biological hydrogen production, coupling and denitrification comprises the steps of sludge inoculation, reactor running and the like.In sludge inoculation, sludge which simultaneously comprises denitrification microorganisms and hydrogen production microorganisms in an anaerobic reactor, and thus, MLSS in the reactor is 15-20 g/L;according to running of the reactor, organic sewage is pumped into the anaerobic reactor, the running temperature of the reactor is controlled to be 25-37 DEG C, running pH of the reactor is controlled to be 4-10, oxidation reduction potential is controlled to be minus 200- minus 500 mV, and hydraulic retention time is controlled to be 4-12 h until sewage treatment is finished. In the method, theproblem that carbon sources are insufficient in a denitrification process is solved, the hydrogen production property in a hydrogen production process of dark fermenting organisms is improved, the dosage of throwing and adding of alkali in the hydrogen production process of the dark fermenting organisms is reduced, and the running cost in a process of nitrogen removal by denitrification can be reduced.

The invention discloses a reactor for preparing hydroanthraquinone and a preparation method of hydroanthraquinone. The reactor comprises a reaction kettle, a circulating pump, a heat exchanger and a Venturi ejector, the Venturi ejector comprises an inlet section, a nozzle, a mixing section and a diffusion section which are communicated in sequence; the inlet section and the nozzle are in a reducing pipe type; the ratio of the inner diameter of an inlet section opening to the inner diameter of a nozzle to the inner diameter of an air chamber closing opening to the length of a mixing section to the length of a diffusion section of the Venturi ejector is 34: (2-5): (3-6): (30-60): (600-1000); and the opening angle of the diffusion section is 10-25 degrees. According to the present invention, the specification and the size of the reactor are optimized, such that the mass transfer process of the reaction is effectively enhanced, the catalyst liquid film thickness is reduced, the conversion from EAQ to EAQH2 can be achieved with low hydrogen partial pressure and low catalyst consumption, the hydrogenation depth is effectively controlled, and the selectivity and the utilization rate of the effective anthraquinone by the catalyst are significantly improved.

The invention discloses a two-stage hydrocracking method, which comprises the following steps: a first-stage hydrocracking reaction effluent enters a flash separator to separate out a liquid phase flow and a gas phase flow, the liquid phase flow enters a fractionation system to separate out heavy naphtha and tail oil, the gas phase flow is mixed with the tail oil, and then a second-stage hydrocracking reaction is performed, and carrying out gas-liquid separation on the effluent of the second-stage hydrocracking reaction, taking the separated gas phase as recycle hydrogen of the first-stage hydrocracking reaction, and separating the liquid phase into a gas phase product, light naphtha, heavy naphtha and tail oil in a fractionation system. The method can increase the selectivity of the high-quality heavy naphtha product while reducing the deactivation rate of the two-stage hydrocracking catalyst.

The invention discloses a two-phase anaerobic fermentation system applying gas-liquid combined stirring. A hydrolytic acidification tank 1, a gas production tank 2, a gas collection tank 3, a desulfurization drying device 4, a purifying device 5, an air pump 6, and a circulating pump 7 form two circulation of pneumatic stirring and hydraulic stirring. The two kinds of stirring modes including pneumatic stirring and hydraulic stirring are utilized to correspond to two stages of the two-phase anaerobic fermentation system respectively; meanwhile, in the pneumatic stirring circulation, CO2 which is refined and extracted from marsh gas is regarded as stirring power, thus the yield of methane is sharply increased, the organic waste is converted into energy substance methane, the greenhouse gas emission amount is reduced at the same time, and thus the two-phase anaerobic fermentation system which is simple in structure and convenient to operate is obtained.