451 results about "Residual oxygen" patented technology

A method and installation are disclosed which can, for example, provide for reliable, low-Nox-emission operation of a gas turbine installation with hydrogen-rich fuel gas. An exemplary gas turbine installation includes an arrangement for flue gas recirculation into a compressor inlet and for fuel gas dilution. Oxygen content in combustion air can be reduced by recirculation of recooled flue gas, and the fuel gas can be diluted with compressed flue gas. The oxygen reduction in the combustion air can lead to minimum residual oxygen in the flue gas which can be used for fuel gas dilution. As a result of the flue gas recirculation, water content in the combustion air can be increased by feedback of the water which results as a combustion product. The oxygen reduction, increased water content, and fuel dilution can reduce the flame velocity of hydrogen-rich fuel gases and enable a robust, reliable and low-emission combustion.

The object of the present invention is to provide rare-earth system sintered magnets such as R-Fe-B system or R-Co system having excellent magnetic properties, unique configuration of a small size, thin wall thickness and intricate geometry. With the method for preparing the present invention, a granulation of alloy powders can be achieved easily, a chemical reaction between rare-earth system and binder substances can be suppressed, so that the residual oxygen and carbon levels in the sintered products can be reduced. Moreover, by this production method, the flowability and lubricant capability during the forming process can be improved. The dimension accuracy and productivity are also enhanced. A certain type of binder is added to rare-earth alloy powders and kneaded into a slurry state. The slurry is then formed into granulated powders by spray-dryer equipment. The thus granulated powders are molded, and sintered through a powder metallurgy technique.

The invention provides a starting and shutdown control method for a proton exchange membrane fuel cell. According to the method, a whole fuel cell stack is divided into a plurality of cell modules; each cell module is connected with a modularized discharging circuit which is composed of a control switch, an auxiliary load and a crystal diode in mutual series connection; each modularized discharging circuit and a main load circuit are in series connection and are respectively connected with the cathode end and the anode end of the fuel cell; an air source is connected with the anode end of the fuel cell through an air blow-down valve; and air is used to purge residual hydrogen at the anode. During starting control, hydrogen is used to purge the anode, and the auxiliary load is used to control the voltage of the cell; and during shutdown control, introduction of air and introduction of hydrogen are successively stopped, a closed system of the auxiliary load is used for discharging, and introduction of air is cooperatively used for purging of the anode. The invention has the following advantages: consumption of time during shutdown of the fuel cell is reduced; the concentration of residual oxygen at the cathode is lowered down; reversal of poles of a single cell in the modules is prevented, and the phenomenon of reversal of poles of the fuel cell in the processes of shutdown discharging and air purging is prevented; and the system of the fuel cell is more simplified and is convenient to operate.

The present disclosure relates to systems and processes for adsorptive gas separations where a first gas mixture including components A and B is to be separated so that a first product of the separation is enriched in component A, while component B is mixed with a third gas component C contained in a displacement purge stream to form a second gas mixture including components B and C, and with provision to prevent cross contamination of component C into the first product containing component A, or of component A into the second gas mixture containing component C. The invention may be applied to hydrogen (component A) enrichment from syngas mixtures, where dilute carbon dioxide (component B) is to be rejected such as directly to the atmosphere, and with preferably nitrogen-enriched air as the displacement purge stream containing residual oxygen (component C).

The present invention provides an idle stop-start control method of a fuel cell hybrid vehicle including a fuel cell as a main power source and a storage means as an auxiliary power source, in which air and hydrogen supply is cut off during low power operation where the efficiency of the fuel cell is low and during regenerative braking such that residual oxygen and hydrogen are consumed to drop the voltage of a fuel cell stack, thus stopping the operation of the fuel cell.

The invention provides an intelligent dynamic combustion atmosphere controller, comprising a combustible matter content detector, a residual oxygen amount analyzer, a smoke temperature detector, a PLC (pogrammable logic controller), and a touch screen, wherein an input end of the PLC is connected with the combustible matter content detector, the residual oxygen amount analyzer and the smoke temperature detector; an output end of the PLC is connected with an air flow adjusting valve; combustible matter content, residual oxygen amount and smoke temperature signals, which are collected in smoke in real time, are sent to the PLC; the PLC prompts a combustion atmosphere state by calculating, comparing and analyzing according to set parameters, and controls the air flow adjusting valve to automatically adjust an air-fuel ratio, so as to accurately control combustion atmosphere; and a combustion type, a control mode, a control parameter and an alarming parameter can be set through the touch screen. The intelligent dynamic combustion atmosphere controller has the advantages as follows: the combustible matter content, the residual oxygen amount and the smoke temperature in the smoke in combustion equipment, such as a heating furnace, a boiler and the like, are measured and analyzed, so that the flow of the combustion air is intelligently adjusted; the air-fuel ratio can be automatically adjusted in real time; and the combustion atmosphere can be accurately controlled.

The invention discloses a control method for coast atmospheric corrosion resistant scale on the surface of a boat deck, which belongs to the field of steel for hull structures. According to the invention, the structure and thickness of scale on the surface of a boat deck is controlled by optimizing production processes for boat decks. The method comprises the following key points: controlling parameters of heating temperature, time, residual oxygen and the like for continuous casting billets and reinforcing a de-scaling effect once; controlling the index of chloride ion in water for production, reducing the content of deposited chloride ions in scale and inhibiting corrosive pitting; controlling initial rolling temperature and finishing rolling temperature in the stage of finish rolling, reasonably utilizing a weak water cooling system, increasing the content of Fe3O4 in scale, reducing the content of Fe2O3, retaining a small amount of FeO and enabling the scale to have good plasticity, a bonding force and corrosion resistance. The advantages of the invention are as follows: it does not need to reconstruct existing equipment, and the surface quality and production efficiency of the boat deck can be enhanced through technological optimization; structural composition of the scale is reasonably controlled, which enables the surface of the boat deck to have excellent coast atmospheric corrosion resistance, especially enables corrosive pitting caused by chloride ions to be inhibited, and enables the storage duration of the boat deck in coast environment to be prolonged.

The invention relates to a method for controlling combustion atmosphere in a large-scale walking beam type plate blank heating furnace, which belongs to the technical field of fuel combustion of industrial furnaces. A plate blank is heated through a preheating section, each heating section and a soaking section to finish the process of heating and temperature equilibrium; and in the process, a first-level computer control system and a second-level computer control system automatically generate a heating process and automatically set and control the furnace temperature in each section according to original data of the plate blank called from a database; and on the basis of an output control value of a residual oxygen analyzer, the computer control systems calculate the air consumption coefficient of each combustion area, perform dynamic track on the combustion atmosphere in the whole furnace along with the changes of thermal loads, correct the combustion atmosphere according to the actual air-fuel ratio of six combustion areas, adjust the proportion of combustion air and gas, and determine the reasonable air and gas flow to achieve the furnace temperature required by the heating process. The method has the advantages that the condition of furnace gas component changes in the furnace is quantificationally provided for a heating furnace operator in time, so that the combustion in the heating furnace reaches good state; and simultaneously, the energy-saving and environmental protection effects are remarkable.

A test system of oxygen transducer used on automobile comprises fuel output unit for mixing fuel with air to generate mixture, combustion unit including ignition element and combustion chamber with air exhaust pipe, oxygen transducer set on air exhaust pipe with its head being inserted into said pipe to sense residual oxygen concentration in tail gas, signal collection unit for receiving signal outputted by oxygen transducer.

A method and device for operating a fuel cell system. A recirculation loop coupled to a fuel cell cathode ensures that fluids passing through the cathode are recycled, thereby enabling reaction between residual oxygen in the recycled fluid and fuel that has been introduced into the recirculation loop until a reduced voltage level across the fuel cell is achieved. Attainment of the reduced voltage level indicates that the recycled fluid is substantially oxygen-free, yielding an inerting fluid. Thereafter, this compound, followed by air, or air directly can be used to purge the fuel cell's anode and related flowpath during system shutdown. Similarly during system startup, hydrogen can then be introduced into the fuel cell's anode and then air into the cathode and related flowpath for normal operation. The placement of a purge valve allows the anode to be purged with air without re-introducing air into the cathode.

The invention discloses a system and method for automatically controlling the content of residual oxygen in a regenerative heating furnace and belongs to the technical field of control over combustion of heating furnaces. The system comprises a computer terminal, a programmable controller, a regulating valve, zirconium oxide analysis meters and a heat value analysis meter. A combustion section of the heating furnace comprises a first heating section, a second heating section and a soaking section, the zirconium oxide analysis meters are installed in the middle portions of the tops of all the sections, and the heat value analysis meter is installed in front of an inlet of a gas main. During combustion of the heating furnace, the actual air-fuel ratios are obtained through calculation according to the theoretical air-fuel ratios of the three sections, and optimal control over the content of the residual oxygen in a hearth is achieved by combining the zirconium oxide analysis meters with the heat value analysis meter for control. The system and method for automatically controlling the content of the residual oxygen in the regenerative heating furnace have the advantages that a gas and an air flow control valve is controlled reasonably, accurately and rapidly, the adjustment function of the regulating valve is effectively utilized, optimal control over the content of the residual oxygen in the hearth of the heating furnace is achieved, fuel is saved, and pollution is reduced.

The invention discloses edaravone injection and a preparation method thereof. The injection contains edaravone serving as an active material, sodium pyrosulfite serving as antioxygen and propylene glycol serving as cosolvent. In the invention, in an edaravone injection production process, the sodium pyrosulfite antioxygen is added and high-purity nitrogen is charged into an ampoule bottle before and after liquid medicine canning and sealing to ensure the residual oxygen in the air above the liquid medicine in the ampoule bottle is less than 3 percent, so the edaravone is kept in a low-oxygen environment all the time. In the invention, the stability of the edaravone injection is improved, the period of validity of the edaravone injection is prolonged, and the safety and effectiveness of the edaravone injection in clinical use are ensured.

The disclosed combustion-type measurement method for gas heat value comprises: with gas coupling device and combustion-supporting air transmission device, conveying some gas and combustion-supporting air into combustion furnace for complete combustion to produce smoke; measuring the residual oxygen content in smoke to calculate the gas heat value. This invention can not be affected by environmental temperature, has no hysteretic phenomenon, needs small maintenance labor and low cost, and runs stably.

The invention relates to a method for preserving edible oil by charging nitrogen. After the edible oil is filled in a tank, nitrogen is charged into a bottle to lead the air in the bottle and the oxygen in the edible oil to be replaced and lead the residual oxygen in the head space of the bottle to be less than 3 percent and then a pressure pad is sealed, thus leading the residual oxygen of the edible oil in the bottle to be very low and the edible oil has no oxygen source that can supply reaction on one hand; and on the other hand, the nitrogen in the head space of the bottle forms a nitrogen sealing which obstructs the oxygen to be contacted with the edible oil, thus achieving the effects of protecting the edible oil and preventing the edible oil from oxygenation; simultaneously, the invention can avoid the hidden troubles to the health of the human body caused by using artificial antioxidant.

A gas concentration detecting apparatus comprises a gas concentration sensor and a gas concentration calculator. The sensor has first to third cells. A gas to be detected is introduced in a chamber and the first cell is responsible for discharging and changing oxygen from and into the chamber. The second cell detects a concentration of a specific gas component of the gas that has passed along the first cell. The third cell detects a concentration of residual oxygen in the gas that remains after discharge of the oxygen through the first cell. The calculator takes in a current acquired from the second cell measured with a voltage applied thereto and calculates the specific gas component concentration based on the current. The calculator includes plural concentration calculating means whose concentration detecting ranges are mutually different in a scale. The specific gas component concentration is calculated every concentration calculating means.

The invention relates to a brown coal dry-distillation method using a coal hot air furnace to supply heat. The brown coal dry-distillation method comprises the following steps of: adding brown coal in a drying furnace to be heated and dried, sending the heated coal into a dry-distillation furnace to be heated and dry-distilled to obtain thermal carbocoal, cooling and quenching the thermal carbocoal in a quenching furnace to obtain a carbocoal product; purifying high-temperature smoke produced by the coal hot air furnace in a purifying room, making dry-distilled coal gas enter into the purifying room, consuming residual oxygen in the high-temperature smoke to produce high-temperature hot air with a low oxygen content as all or partial heating sources of the drying furnace used for coal drying, wherein the dry-distilled heat source in the dry-distillation furnace partially or all comes from the high-temperature smoke produced by burning the dry-distilled coal gas in a burner, and obtaining crude tar and clean dry-distilled normal-temperature coal gas after the following treatments: de-dusting and cooling the dry-distilled coal gas and tar steam, and separating tar and on the like. Compared with the method taking the dry-distilled coal gas as the heat source drying heat source, the high-temperature smoke of the coal hot air furnace is used as the brown coal drying heat source, a lot of dry-distilled coal gas is surplus, such that the saved plenty of dry-distilled coal gas can be for other uses and thus the economic value is high.

The invention provides an internet of things intelligent ambulance system. The internet of things intelligent ambulance system comprises a vehicle-mounted embedded host and an ambulance vehicle management platform, wherein the vehicle-mounted embedded host is installed in an ambulance, the ambulance vehicle management platform is installed in a hospital, and the vehicle-mounted embedded host is connected with the ambulance vehicle management platform through a wireless transmission device so that data interaction can be achieved. The all-direction intelligent vehicle management is achieved through the internet of things, intelligent sensing and other technologies, and position information, the amount of residual oxygen, the amount of electricity of a storage battery, oil consumption, tire pressure, stretcher states, fault codes and other related information of vehicles are monitored in real time. The vehicle conditions of ambulances can be known in real time through the system, whether the ambulances can be normally driven out for operation is judged or whether the ambulances need to be repaired, maintained and the like is judged, the safety of the ambulances becomes controllable, and guarantees are provided for the smooth and safe development of the first-aid service.

The invention relates to a metal crown lid internal gasket sealing material with an oxygen absorbing function. The metal crown lid internal gasket sealing material is prepared by respectively adding 2-30 parts by weight of single-components of different types or an oxygen absorbent of a compound component by taking a thermoplastic elastomer as a base material. The metal crown lid internal gasket sealing material can be processed into a metal crown lid gasket by adopting an existing non-oxygen absorbing gasket machining process, can absorb residual oxygen of a headspace in an absorbing bottle while keeping the original machining and sealing property of the gasket, and ensures that the oxygen concentration is reduced to a limit oxygen concentration of 0.5ml/l from 210ml/l, thereby prolonging the quality guarantee period.

The invention relates to a method for anti-adhesion nitrogen increase in the process of producing vanadium nitride, and belongs to the technical field of vanadium nitride alloy production. The technical scheme comprises the following steps of: pretreating raw pellets before the vanadium nitride raw pellets enters a furnace to be fired, and putting the raw pellets into graphite powder, wherein a pretreatment method of sticking and coating the graphite powder on the surface is adopted, and the graphite powder is taken as an anti-adhesion material; and putting the raw pallets uniformly stuck with the graphite powder into a reaction furnace for firing. By the method, the problem of adhesion among products in the process of producing vanadium nitride can be effectively solved, the appearance quality of the products and the finished product ratio are improved, the surface area of nitriding reaction can be increased by 1/8 to 1/2 when the vanadium nitride pellets are fired, and the graphite powder on the surfaces of the pellets can consume partial residual oxygen and protect vanadium carbide/vanadium nitride in the pellets so as to prevent the vanadium carbide/vanadium nitride from being oxidized, improve the nitrogen content in the products and improve the grade and yield of the products. The method is suitable for all vanadium nitride production modes, particularly production of vanadium nitride by the most mature horizontal pusher kiln method at present.

The invention discloses a catalyst with functions of methane catalytic combustion and conversion, and a preparation method thereof. The catalyst is an integer honeycomb catalyst, comprising one or a plurality of active components selected from manganese, nickel and cobalt, and one or a plurality of auxiliary agents selected from MgO, La2O3, CeO2 and BaO, wherein the active components are in a form of oxide and account for 5%-20%, and the auxiliary agents account for 1-10%, and the balance is carrier. The catalyst has double functions of methane catalytic combustion and methane steam conversion and can be used in reactions of gas preparation for power generation from low-quality coalbed methane. After reaction, residual oxygen in the gas is little, and a decrease of a feed gas gross calorific value is low; besides the catalyst has high strength, good thermal stability and good low-temperature light-off temperature.

The present invention relates to a method for preparing photoluminescent silicon nanoparticles having uniformly hydrogen-terminated surfaces that are essentially free of residual oxygen. The present invention also relates to a method of preparing a blue-emitting photoluminescent silicon nanoparticle. The present invention further relates to a composition that includes a photoluminescent silicon nanoparticle having a surface that is uniformly hydrogen-terminated and essentially free of residual oxygen. The present invention also relates to a composition including a photoluminescent silicon nanoparticle having a surface that is uniformly coated with an organic layer and essentially free of residual oxygen. The present invention additionally relates to a composition including a photoluminescent silicon nanoparticle stably dispersed in an organic solvent and having a surface that is uniformly coated with an organic layer and essentially free of residual oxygen.