377 results about "Ammonia production" patented technology

A method and system are described for making ammonia using hydrogen from a gasification process and for integrating the steam systems of the two processes. The gasification process provides high-pressure, purified hydrogen and high-pressure, saturated steam. The high pressure hydrogen lowers the overall compression requirement for the ammonia process. In addition, the high-pressure, saturated steam can be converted into superheated steam by recovering heat from ammonia synthesis and used to power steam turbines for compression and refrigeration needs.

An exhaust gas purifying apparatus and method for an internal combustion engine, and an engine control unit are provided for appropriately determining the amount of reducing agent supplied to a NOx selective reduction catalyst to ensure good exhaust gas characteristics. The exhaust gas purifying apparatus comprises an ECU; a NOx selective reduction catalyst for purifying NOx in exhaust gases in an exhaust pipe; a NOx sensor disposed in the exhaust pipe at a location downstream of the NOx selective reduction catalyst for detecting a NOx concentration in exhaust gases; and an injector for supplying the NOx selective reduction catalyst with ammonia produced in an ammonia production unit. The ECU determines the amount of ammonia injected to the NOx selective reduction catalyst by the injector such that an estimate of the NOx concentration detected by the NOx sensor reaches a minimum value.

The invention relates to a flue gas desulphurization and denitration method as well as its apparatus, and especially relates to a desulphurization and denitration technology system for flue gas from large-scale mobile facilities such as ships. The method comprises the following steps: flue gas is passed through a heat pipe exchanger and a heat pump in order for increasing temperature of flue gas, and flue gas is selectively passed through an electric heater for heating to the temperature of 340-350 DEG C, an urea solution is used for preparing ammonia gas in a hydrolysis reactor, ammonia gas is diluted by partial high temperature flue gas at an outlet of a SCR reactor and then mixed for injecting flue gas which is undenitrated, the mixed flue gas enters into the SCR reactor for a flue gas denitration reaction, the flue gas after denitration is passed through the heat exchanger, the heat pump and the hydrolysis reactor and cooled, and then enters into a desulfurization tower, flue gas after desulphurization is directly discharged into atmosphere, and an absorption liquid adds alkali and seawater for regeneration and cycle usage. In the method, the heat exchanger and the heat pump are used for recovering waste heat of flue gas, and the energy consumption is greatly reduced. The ammonia production method through hydrolysis is capable of increasing the mixing degree of ammonia and flue gas, so that denitration efficiency can be further increased.

A method and apparatus for synthesizing anhydrous ammonia utilizing proton conducting electrolyte having a water vapor dissociating electrocatalyst on one side and a nitrogen dissociating electrocatalyst on the other side. A voltage is provided across the proton conducting electrolyte, protons are separated from the water vapor and transferred through the middle of the proton conducting electrolyte to the second side of the proton conducting electrolyte. Nitride ions are formed from nitrogen and the electrons provided by the voltage on the second side of the proton conducting electrolyte. The protons are then reacted with the nitride ions on the second side of the proton conducting electrolyte to produce anhydrous ammonia. A preferred proton conducting electrolyte is barium cerium oxide doped with about 10% ytterbium with a water vapor dissociating electrocatalyst of Ni and Pd, and a nitrogen dissociating electrocatalyst of Co and Ru.

A process for producing hydrogen or ammonia is disclosed. Steam (202) and a metal or a metal-containing compound (in the case of ammonia production, a metal nitride) are provided to a reaction zone (213) and reacted under conditions for obtaining gaseous hydrogen or ammonia, respectively. The metal or metal-containing compound is provided in the form of nanoparticles and/or nanodroplets with a BET surface area of at least 1.0 m²/g. The nanoparticles and/or nanodroplets may be produced in-situ, either by rapid cooling of a stream of a vapor (203) of the metal or metal-containing compound in a formation zone (212), or by feeding a stream of a precursor into the formation zone (212) and reacting the precursor with a reactant gas in the formation zone to obtain nanoparticles and/or nanodroplets. An apparatus (201) for carrying out the process is also disclosed

The invention belongs to the field of chemical engineering, in particular to an ammonia synthesis process. The process is characterized in that obtained synthesis gases are conveyed to the ammonia synthesis process by ten steps to produce product ammonia. The invention adopts the process technology that crude gas in a coking plant is used as raw material, nitrogen and methane in the crude gas areseparated and purified by utilizing a PSA (Pressure Swing Absorption) device to greatly reduce atmospheric pollutants, such asH2S, NH3 and the like and the emission of CO2. The invention provides a low-cost low-carbon synthetic ammonia production process which can reduce the atmospheric pollutants, such asH2S, NH3 and the like and lessen the emission of CO2.

A power system is provided having a first power source including at least one engine configured to combust a first air/fuel mixture and produce a first exhaust stream. The fuel of the first air/fuel mixture may be liquefied petroleum gas. The system also has a first exhaust passageway fluidly connected to the first power source and configured to receive the first exhaust stream. In addition, the system has a second power source including at least one engine configured to combust a second fuel/air mixture and produce a second exhaust stream. Furthermore, the system has a second exhaust passageway fluidly connected to the second power source and configured to receive the second exhaust stream. The system further has a first catalyst disposed within the first exhaust passageway to convert at least a portion of the first exhaust stream to ammonia

Disclosed is a technology based upon the simple nesting of tubes to provide heat exchangers, chemical reactors or chemical reactors with built in heat exchanger. As a chemical reactor, the technology provides the ability to manage the temperature within a process flow to better control the process for improved performance, control the location of product production to control corrosion issue, or implement multiple steps for a process within the same piece of equipment. As a heat exchanger, the technology can provide large surface areas per unit volume and large heat transfer coefficients. As a combined heat exchanger and chemical reactor, the technology can recover the thermal energy from the product flow to heat the reactant flow to the reactant temperature, significantly reducing the energy needs for accomplishment of a process. Combined heat exchanger and chemical reactor examples for hydrogen production and ammonia production are presented, along with a urea production example that integrates the product formation, resonance time conversion and stripping steps for urea production all within a single process unit.

The invention relates to means of superchargers loaded internal-combustion engine, in particular diesel engine of a vehicle, in whose exhaust strand an exhaust subsequent treatment mechanism with at least one SCR catalyst is intended, ammonia as reducing agent for nitrogen oxide reduction supplyable is characterized, which is generatable in a ammonia reactor from a urea water solution or a solid urea, by the fact that the ammonia reactor (11) outside at the turbine case of the supercharger, whose heat radiation is used for ammonia production.

The invention discloses a flue gas SCR denitration urea catalytic hydrolysis ammonia production system and a method. The system mainly comprises a reaction system, a urea solution supply system, a steam supply system, an ammonia-air mixing system, a sewage discharge and safety system, a catalyst feeding system, a back blow system. By means of the system, fast hydrolysis reaction of molten state urea can be carried out under a temperature of 135-160DEG C and a pressure of about 0.4-0.9MPa. The reaction speed is enhanced by about more than 10 times than that of the traditional hydrolysis method, the response time can be less than 1min, and the energy consumption is about half of the pyrolysis technology. The system and method provided by the invention have the advantages of fast urea hydrolysis rate, small urea consumption, short hydrolysis reaction time, and realization of automation.

Systems and methods for producing ammonia. In one approach, Li₃N is reacted with hydrogen to produce ammonia and is regenerated using nitrogen. Catalysts comprising selected transition metals or their nitrides can be used to promote the reactions. In another approach, supercritical anhydrous ammonia is used as a reaction medium to assist the reaction of hydrogen with nitrogen to produce ammonia, again promoted using catalysts.

The present invention relates to methods of improving the environment within a poultry farming facility including reducing ammonia production in a poultry facility, inhibiting urease enzymes in poultry litter, reducing levels of pathogenic bacteria in poultry litter, improving productivity of poultry farms, reducing or preventing pododermatitis in poultry reared in mass production poultry facilities and controlling pests in poultry litter. Compositions, suitable for use in such methods, comprising at least one microorganism of the genus Bacillus and at least one biosurfactant wherein the biosurfactant is present in an amount of 2 mg/L to 7000 mg/L are also described.

The invention discloses a monatomic catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of: carrying out a high-temperature polymerization reaction on an organic matter which is rich in nitrogen and carbon and is used as a precursor to prepare a block carbon nitride material, and then carrying out stripping treatment to obtain a carbon nitride ultrathin nanosheet; carrying out a hydrothermal reaction on a hydrothermal reaction system containing the carbon nitride ultrathin nanosheet, a transition metal source and a solvent to prepare a transition metal oxide/carbon nitride composite material; and calcining and etching the transition metal oxide/carbon nitride composite material to obtain the monatomic catalyst. According tothe monatomic catalyst as well as the preparation method and application thereof of the invention, transition metal single atoms are loaded on the carbon nitride ultrathin nanosheet, and ammoniationtreatment is further carried out, so that the nitrogen fixation performance of the monatomic catalyst is greatly improved, and the ammonia production efficiency can reach 675mu mol.g <-1> h <-1>.

A method for the simultaneous modernization of a plant for ammonia synthesis and a plant for urea synthesis, provides-inter alia-the arrangement of a carbamate synthesis section and a carbamate decomposition section, in order to obtain a predetermined amount of carbamate in aqueous solution and of hydrogen and nitrogen in gaseous phase which are fed to the existing sections for urea synthesis, respectively ammonia synthesis. Thanks to this method of modernization it is possible to remarkably increase the production capacity and at the same time to reduce the energy consumption of the urea and ammonia plants without being forced to replace or anyway overload the existing sections of decarbonation, methanation and compression, in general.

An integrated process for the manufacture of olefins and intermediates for the production of ammonia and urea, comprising an FCC reactor, a regenerator, a steam reforming unit, an air-separation unit, an ammonia production unit and a urea production unit, is described. This process makes it possible to minimize CO₂ emissions to atmosphere, make use of heavy feedstocks of low added value (AR) for the production of light olefins, in addition to making maximum use of all the flows involved, thus increasing the energy efficiency achieved, all at the same time.

The invention relates to a process for synthesizing ammonia by utilizing renewable energy or nuclear energy under mild conditions. The process is characterized in that clean energy such as solar energy, wind energy, nuclear energy and the like is utilized to produce hydrogen and nitrogen, ammonia is produced through a chemical looping technology, and then an ammonia adsorbent is utilized to absorbammonia. According to the process, renewable energy sources are utilized, CO2 is not generated in the whole process, high pressure is not needed, and the process is an environment-friendly syntheticammonia process. The process is suitable for small-scale regional ammonia production, and the produced ammonia can be used as nearby farmland fertilizers or energy storage media.