38 results about "Excess nitrogen" patented technology

A novel method and system for liquefying and distilling natural gas into high purity liquid methane (LNG) and NGL product streams. Heat exchangers and distillation towers are configured to produce high purity liquefied natural gas (LNG) and NGL product streams, while also rejecting excess nitrogen contained in the inlet gas stream, utilizing liquid nitrogen as the process refrigerant. A molecular sieve pretreatment system is configured to utilize the vaporized nitrogen stream for regeneration of the molecular sieve beds which are designed for removing water and carbon dioxide from the inlet gas stream

A system and method for removing nitrogen from an intermediate stream in a gas subcooled process operation that processes natural gas into a sales gas stream and a natural gas liquids stream. The system and method of the invention are particularly suitable for use with gas subcooled process operations where the sales gas stream exceeds pipeline nitrogen specifications by up to about 3%, such as for reducing the nitrogen content of sales gas streams to levels permissible for pipeline transport.

The invention belongs to the field of agriculture, and specifically relates to a nitrogen topdressing method implemented through real-time diagnosis in a wheat jointing stage. The method comprises the following steps: in a wheat jointing stage, determining the mean value of SPAD (relative content of leaf chlorophyll) values of wheat leaves in fields; and then, according to the actually-measured mean value of SPAD values of wheat leaves, carrying out nitrogen topdressing in combination with the types of wheat. After an operation of nitrogen topdressing is performed according to the method disclosed by the invention, the application amount of a nitrogen fertilizer can be effectively controlled, and unnecessary fertilizer applications are reduced, thereby facilitating the improvement of the fertilizer efficiency, achieving high yield and high efficiency, and reducing the environmental pollution caused by excess nitrogen fertilizer application.

The invention discloses a coloring and curing mechanism of an optical fiber coloring machine and belongs to the technical field of optical cable processing devices. The optical fiber coloring machine comprises a machine frame box body, and the coloring and curing mechanism comprises a nitrogen inlet pipe provided with a first pressure regulating valve, a printing ink tank, a curing oven and an optical fiber guide device, wherein the printing ink tank and the curing oven are arranged on the machine frame box body; the nitrogen inlet pipe is provided with a three-way connector which arranged in the nitrogen inlet pipe at a position on the air outlet side of the first pressure regulating valve and is connected with the pipes of the printing ink tank and the curing oven respectively; and a second pressure regulating valve is arranged on the pipe connecting the three-way connector and the curing oven. The coloring and curing mechanism of the optical fiber coloring machine has the advantages of increasing nitrogen volume acquired by the printing ink tank, preventing excess nitrogen flow in the curing oven, improving the coloring speed, guaranteeing processing efficiency, saving nitrogen and protecting environment.

Produced natural gas containing carbon dioxide is dehydrated and chilled to liquefy the carbon dioxide and then fractionated to produce a waste stream of liquid carbon dioxide and hydrogen sulfide. Natural gas liquids may be first separated and removed before fractionation. After fractionation, the waste stream is pressurized and transmitted to a remote injection well for injection either for disposal of the waste stream and preferably to urge hydrocarbons toward the producing well. A hydrocarbon stream proceeds from fractionation to a methanol absorber system which removes carbon dioxide gas. The hydrocarbon stream is thereafter separated into at least hydrocarbon gas, nitrogen and helium. Some of the nitrogen is reintroduced into a fractionation tower to enhance the recovery of hydrocarbons. A methanol recovery system is provided to recover and reuse the methanol. The hydrocarbons are sold as natural gas and the helium is recovered and sold. Excess nitrogen is vented.

A blast furnace where coke is combusted with oxygen, instead of air, and where a top gas comprising CO, CO2, H2, and without excess nitrogen is withdrawn from the upper part of the blast furnace, cleaned of dust, the H2 / CO volume ratio adjusted to between 1.5 to 4.0 in a water shift reactor, water and CO2 are removed (increasing its reduction potential), heated to a temperature above 850° C. and fed back to the blast furnace above where iron starts melting (thereby increasing the amount of metallic iron reaching the dead-man zone and decreasing the amount of coke used for reduction). Also carbon deposit problems caused by heating the CO-containing recycled gas are minimized by on-line cleaning of the heater tubes with steam without significantly affecting the reduction potential of the recycled reducing gas.

A blast furnace where coke is combusted with oxygen, instead of air, and where a top gas comprising CO, CO2, H2, and without excess nitrogen is withdrawn from the upper part of the blast furnace, cleaned of dust, the H2 / CO volume ratio adjusted to between 1.5 to 4.0 in a water shift reactor, water and CO2 are removed (increasing its reduction potential), heated to a temperature above 850° C. and fed back to the blast furnace above where iron starts melting (thereby increasing the amount of metallic iron reaching the dead-man zone and decreasing the amount of coke used for reduction). Also carbon deposit problems caused by heating the CO-containing recycled gas are minimized by on-line cleaning of the heater tubes with steam without significantly affecting the reduction potential of the recycled reducing gas.

The invention discloses a method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud, and relates to a method for removing nitrogen and phosphorus from water. By the method, the problems of waste resource utilization and removal of excess nitrogen and phosphorus from water are solved. The method comprises the following steps: leaching most of metal oxides from the red mud by using dilute hydrochloric acid first and then leaching titanium and rare earth elements from the red mud by using concentrated sulfuric acid so as to leave silicon dioxide powder, and then preparing the extracted silicon dioxide into calcium silicate by a hydrothermal method. A certain amount of calcium silicate is added into waste water containing nitrogen and phosphorus, the waste water is oscillated at a certain temperature, ammonia nitrogen is removed from water through gas-liquid separation, and phosphorus is removed from water through ligand exchange and chemical precipitation.

A process for obtaining a synthesis gas (GS) at a predetermined high pressure corresponding to the ammonia synthesis pressure, in which there are hydrogen and nitrogen in a 3 / 1 molar ratio, comprising the steps of feeding a continuous flow of natural gas to a primary reforming step (RP) with steam and to a subsequent secondary reforming step (RS) with excess air obtaining a gaseous flow (GF) comprises hydrogen, excess nitrogen with respect to said molar ratio, undesired substances such as impurities and inerts and subjects said gaseous flow to a purification step comprising cryogenic rectification in a separator unit (S) obtaining a continuous flow of synthesis gas (GS) comprising hydrogen and nitrogen in a 3 / 1 molar ratio, and to a subsequent compression step up to a pressure value required for ammonia synthesis.

The invention discloses a culture method for tilapia breeding based on a bio-flocculation technology. According to the bio-flocculation technology, through assimilation and absorption of microbial communities to inorganic nitrogen in aquaculture water, cordate houttuynia in the floating bed can absorb and assimilate excess nitrogen, phosphorus and organic matter in the pond culture process to purify the water in the pond. The formed bio-flocculent can be used as feed protein, so that secondary utilization of bait protein is realized, the growth of tilapia is promoted, and the utilization efficiency of bait is improved. In addition, cordate houttuynia as a medicinal plant can provide food for tilapia in the process of culture, which is conductive to the improvement of the immune performanceof the fish body. By combining the advantages of the bio-flocculation technology and the cordate houttuynia floating bed technology, an obvious regulation effect is achieved on the water quality of pond culture, and water self-purification is promoted. Moreover, the non-specific immunity of tilapia can be obviously improved to a certain extent, and the yield of tilapia can be increased.

The invention relates to the technical field of manufacture and reliability of silicon carbide semiconductor devices and provides a passivation method for improving high and low temperature stabilityof SiC MOSFET devices comprises the following steps: (1) performing cleaning by an RCA process; (2) performing high temperature thermal oxidation; (3) performing nitrogen-hydrogen mixed plasma passivation treatment; (4) performing glue coating, photolithography, etching, glue removing, and ion implantation to form a source region and a drain region, and (5) manufacturing the SiC MOSFET. The methodhas the advantages that N-H in the nitrogen-hydrogen mixed plasma effectively passivates the oxide trap and the interface trap, in which the H element can passivate oxide traps and interface traps onthe basis of N passivation, and the deep-level traps generated by excess nitrogen are moved to the lower half of the forbidden band or beyond the forbidden band, which reduces the influence of trapson the stability of the MOSFET and improves the stability of SiC MOSFET at low temperature (80-300K) and high temperature (300-500K).

The invention discloses a device for preparing a slow-release nitrogen fertilizer from modified zeolite and a method for preparing a slow-release nitrogen fertilizer by using the device, and belongs to the technical field of fertilizer production. The device is constructed by connecting a crusher, a first conveyor belt, an adsorption reaction tank, a first dryer, a second conveyor belt, a disc granulator, a second dryer, a third conveyor belt, a drum fluidized bed, a fourth conveyor belt and a weighing and bagging machine. According to the device disclosed by the invention, ammonia gas and liquid urea are taken as nitrogen sources, and natural zeolite is modified firstly with a metal chloride solution, thereby remarkably enhancing the nitrogen adsorption performance. The ammonia gas and urea are evenly adsorbed into the microporous structure and the surface of the modified zeolite by vacuum pumping, and the modified zeolite adsorbs tightly with a nitrogen source, thus bringing the slowrelease performance of the modified zeolite into full play. Meanwhile, the zeolite has higher ion exchange and adsorption performance, so that excess nitrogen nutrients in soil can be adsorbed aroundzeolite lattices, soil nutrient loss is reduced, the utilization efficiency of the nitrogen fertilizer is improved, the agricultural pollution is reduced effectively.

The invention relates to a tomato blossom-end rot control method comprising the following steps: 1, ecology treatment: applying difulai microbe fertilizer; 2, agriculture control; 3, biotic control: preventing usage of fertilizer with excess nitrogen containing so as to improve plant disease resistant capability; 4, biological control: multi-applying decomposed chicken manure in each season in the soil with high grittiness, and preventing massive usage of amine state nitrogen fertilizer and potash fertilizer in one time; 5, physical control: film mulching and sunshade net covering; 6, chemical control: employing leaf-spraying calcareous fertilizer technology: spraying 1% calcium superphosphate, or 0.5% calcium chloride plus 5mg / kg naphthalene acetic acid and 0.1% calcium nitrate and aiduoshou 6000 times liquid, or leffingwell no.3 1000-1500 times liquid in one month after tomato fruiting, and contentiously spraying 2-3 times in every 10-15 days from an initial flowering stage. The method employs ecology treatment, agriculture control, biotic control, biological control, physical control and chemical control to greatly reduce tomato blossom-end rot incidence rate, is good in effect, thus greatly improving tomato output and quality.

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and / or liquefied to produce a liquid nitrogen product.

A system and method for monitoring anode bleed trigger events and determining when to adjust a proactive bleed schedule in a fuel cell system. The system employs a bleed trigger monitor algorithm for monitoring proactive bleed and reactive bleeds that determines whether the reactive bleeds are caused by excess nitrogen in the anode. The algorithm monitors the number of reactive bleeds that are cause by nitrogen accumulation in the anode side of the fuel cell stack and changes the proactive bleed schedule in response thereto, if necessary.

The invention relates to a wastewater treatment device capable of removing peculiar smells. The wastewater treatment device comprises a first infusion pump, a filter, a heavy metal adsorption tank, a second infusion pump, an acid-base neutralization tank, a third infusion pump, an ozone generator, an evaporator and a cooler, wherein wastewater is pumped from the water inlet of the first infusion pump; the water outlet of the first infusion pump is communicated with the water inlet of the filter through a pipeline; the water outlet of the filter is communicated with a heavy metal sedimentation tank through a pipeline; the water inlet of the second infusion pump is communicated with the heavy metal sedimentation tank; the water outlet of the second infusion pump is communicated with the acid-base neutralization tank through a pipeline; the water inlet of the third infusion pump is communicated with the acid-base neutralization tank; the water outlet of the third infusion pump is communicated with the ozone generator through a pipeline; the ozone generator, the evaporator and the cooler are sequentially communicated through a pipeline. Compared with the prior art, the wastewater treatment device can absorb heavy metal, remove excess nitrogen and phosphorus elements, sterilize and purify, and remove the peculiar smells.

A synthesis plant includes a separation system upstream of a synthesis loop that removes excess nitrogen and other gaseous compounds from a feed gas having a ratio of hydrogen to nitrogen of less than 3:1, thereby producing a syngas with a ratio of hydrogen to nitrogen at about 3:1. Particularly preferred separation systems include a coldbox with a refrigerant other than air, or a pressure swing absorption system.

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and / or liquefied to produce a liquid nitrogen product.

The invention relates to a waste water treatment device with an organic matter degradation function. The device comprises a first liquid drawing pump, a filter, a heavy metal sedimentation tank, a second liquid drawing pump, an acid-base neutralization tank, a third liquid drawing pump, a microelectrolysis device, an evaporator and a cooler. Waste water is extracted by a water inlet of the first liquid drawing pump, a water outlet of the first liquid drawing pump is communicated with a water inlet of the filter by a pipe, a water outlet of the filter is communicated with the heavy metal sedimentation tank by a pipe, a water inlet of the second liquid drawing pump is communicated with the heavy metal sedimentation tank, a water outlet of the second liquid drawing pump is communicated with the acid-base neutralization tank by a pipe, a water inlet of the third liquid drawing pump is communicated with the acid-base neutralization tank, a water outlet of the third liquid drawing pump is communicated with the microelectrolysis device by a pipe, and the microelectrolysis device, the evaporator and the cooler are orderly communicated by pipes. Compared with the existing waste water treatment device, the waste water treatment device provided by the invention can adsorb heavy metals and eliminate excess nitrogen and phosphor elements and high-concentration salt, difficultly degraded and high-chroma substances.

The invention relates to the technical field of chemical industry, and in particular to an impinging stream low-nitrogen combustion reaction device. The impinging stream low-nitrogen combustion reaction device comprises the following parts of a cylindrical or rectangular impinging stream reaction chamber, wherein the side of the impinging stream reaction chamber is uniformly opened with several layers of installation through holes from bottom to top; acceleration tubes installed in the installation through holes; an air flow channel installed on the top of the impinging stream reaction chamberand communicated with the impinging stream reaction chamber; a burner communicated with the other end of the air flow channel; and a boiler installed on the top of the burner and providing heat by the burner. The invention also discloses an impinging stream low-nitrogen combustion reaction method, which specifically comprises the following steps of introducing high-speed air and high-speed gas into the acceleration tubes in the same layer for collision to obtain a rising ion current; driving the turbulence fan to rotate by the rising ion current when passing through a turbulence fan so as toevenly mix the ions in the ion flow, and making the ion flow continue to rise into the burner; heating the burner to 1000 to 1100 DEG C to cause the ion flow to burn and release heat; and exhausting excess nitrogen and water.

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and / or liquefied to produce a liquid nitrogen product.

Produced natural gas containing carbon dioxide is dehydrated and chilled to liquefy the carbon dioxide and then fractionated to produce a waste stream of liquid carbon dioxide and hydrogen sulfide. Natural gas liquids may be first separated and removed before fractionation. After fractionation, the waste stream is pressurized and transmitted to a remote injection well for injection either for disposal of the waste stream and preferably to urge hydrocarbons toward the producing well. A hydrocarbon stream proceeds from fractionation to a methanol absorber system which removes carbon dioxide gas. The hydrocarbon stream is thereafter separated into at least hydrocarbon gas, nitrogen and helium. Some of the nitrogen is reintroduced into a fractionation tower to enhance the recovery of hydrocarbons. A methanol recovery system is provided to recover and reuse the methanol. The hydrocarbons are sold as natural gas and the helium is recovered and sold. Excess nitrogen is vented.

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and / or liquefied to produce a liquid nitrogen product.

A device and method for simply preparing VOC gas are disclosed. The device includes a hollow cavity provided with a gas feeding conduit communicated with the cavity, with the gas feeding conduit beingused for feeding nitrogen into the cavity; a gas discharging conduit used for discharging air and excessive nitrogen in the cavity; and a sample conduit used for adding liquid VOC into the cavity andsucking the prepared VOC gas. The gas feeding conduit and the gas discharging conduit are provided with open-close gears. The sample conduit is provided with a rubber stopper. Operation can be performed directly on a glass container. The mole number of the nitrogen is calculated according to one atmospheric pressure, and therefore a high-pressure nitrogen preparing apparatus and an electronic balance are not needed, and the device is simple and easy to operate. The device is convenient to use and can prepare the VOC gas having a required concentration at any time. The device and the method are rapid, the VOC gas is immediately used after the VOC gas is prepared, a mixing gear for uniform mixing is not needed, and hand shaking is utilized to directly mix a material.

The invention relates to a water-flush formula fertilizer special for a Chinese herbal medicine Andrographis paniculata. The fertilizer comprises the following effective elements by weight: 23.0-28% of nitrogen; 6.0-10.0% of phosphor, measured in P2O5; 10.0-15.0% of potassium, measured in K2O; 1.2-3.5% of sulfur, measured in SO4<2->; 0.2-1.0% of zinc, measured in ZnO; 0.5-1.3% of manganese, measured in MnO; and 2.1-5.6% of calcium, measured in CaO. The fertilizer of the invention is a formula fertilizer special for Andrographis paniculata and other Chinese herbal medicines, and is also suitable for field water-flush appilication. Combining irrigation and fertilization, the fertilizer in the invention has complete nutrient component, rational nutrient proportioning and high fertilizer utilization rate, and is in line with the nutrient absorption rules of Andrographis paniculata and other Chinese herbal medicines. The fertilizer provided in the invention can promote the growth and development of Andrographis paniculata, increase output and economic benefits, raise drug effect component content like andrographolide, and can simultaneously reduce the unfavorable influences to the environment as a result of excess nitrogen application or improper fertilization, thus mitigating environmental pollution and protecting the environment.

A system and method for monitoring anode bleed trigger events and determining when to adjust a proactive bleed schedule in a fuel cell system. The system employs a bleed trigger monitor algorithm for monitoring proactive bleed and reactive bleeds that determines whether the reactive bleeds are caused by excess nitrogen in the anode. The algorithm monitors the number of reactive bleeds that are cause by nitrogen accumulation in the anode side of the fuel cell stack and changes the proactive bleed schedule in response thereto, if necessary.

The invention discloses selective emission equipment for nitrogen oxide-containing waste gas in industrial production, and the equipment comprises treatment equipment, wherein a gas inlet pipeline anda gas outlet pipeline are arranged on the treatment equipment, a grid basket is fixedly connected in the gas outlet pipeline, the grid basket is arranged close to the treatment equipment, a working layer is arranged in the grid basket, the working layer is connected with the gas inlet pipeline and the gas outlet pipeline, the working layer is made of a three-dimensional folded graphene nanosheetmaterial, a recycling hole is formed in one side wall of the air outlet pipeline and is far away from the treatment equipment, and a recycling pipe is fixedly connected to the outer wall of the air outlet pipeline and is arranged opposite to the recycling hole. According to the invention, the waste gas which still has a certain amount of nitrogen oxide after treatment can be selectively introducedinto the treatment equipment for retreatment, so the waste gas containing excessive nitrogen oxide is prevented from being directly discharged into the air to cause pollution, and the environment isprotected.

The invention relates to a water-flush formula fertilizer special for a Chinese herbal medicine Andrographis paniculata. The fertilizer comprises the following effective elements by weight: 23.0-28% of nitrogen; 6.0-10.0% of phosphor, measured in P2O5; 10.0-15.0% of potassium, measured in K2O; 1.2-3.5% of sulfur, measured in SO4<2->; 0.2-1.0% of zinc, measured in ZnO; 0.5-1.3% of manganese, measured in MnO; and 2.1-5.6% of calcium, measured in CaO. The fertilizer of the invention is a formula fertilizer special for Andrographis paniculata and other Chinese herbal medicines, and is also suitable for field water-flush appilication. Combining irrigation and fertilization, the fertilizer in the invention has complete nutrient component, rational nutrient proportioning and high fertilizer utilization rate, and is in line with the nutrient absorption rules of Andrographis paniculata and other Chinese herbal medicines. The fertilizer provided in the invention can promote the growth and development of Andrographis paniculata, increase output and economic benefits, raise drug effect component content like andrographolide, and can simultaneously reduce the unfavorable influences to the environment as a result of excess nitrogen application or improper fertilization, thus mitigating environmental pollution and protecting the environment.

The invention discloses a method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud, and relates to a method for removing nitrogen and phosphorus from water. By the method, the problems of waste resource utilization and removal of excess nitrogen and phosphorus from water are solved. The method comprises the following steps: leaching most of metal oxides from the red mud by using dilute hydrochloric acid first and then leaching titanium and rare earth elements from the red mud by using concentrated sulfuric acid so as to leave silicon dioxide powder, and then preparing the extracted silicon dioxide into calcium silicate by a hydrothermal method. A certain amount of calcium silicate is added into waste water containing nitrogen and phosphorus, the waste water is oscillated at a certain temperature, ammonia nitrogen is removed from water through gas-liquid separation, and phosphorus is removed from water through ligand exchange and chemical precipitation.