394 results about "Ammonia" patented technology

The invention discloses a high-entropy perovskite hydroxide, a preparation method thereof and application of the high-entropy perovskite hydroxide in electro-catalysis of nitrate to synthesize ammonia, and belongs to the technical field of high-entropy perovskite hydroxides. The high-entropy perovskite hydroxide is ASn (OH) 6, and A is one or more of Zn, Mn, Co, Ni and Cu. The high-entropy perovskite hydroxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, the electrocatalyst can be applied to electrocatalysis of nitrate to synthesize ammonia, the highest NH3 Faraday efficiency is 98.16%, and the yield is 5.12 mg h <-1 > mgcat <-1 >. And a foundation is laid for developing other high-entropy perovskite compounds as electrocatalysts for electrocatalytic synthesis of nitrate.

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

This invention discloses a composite sponge carrier for anaerobic ammonia oxidation, its preparation method, and its application, belonging to the field of wastewater treatment technology. The composite sponge carrier comprises: a porous polyurethane sponge and a composite component loaded on the surface and internal pores of the porous polyurethane sponge; wherein the composite component includes chitosan-modified biochar as a microbial affinity functional component and zeolite powder as a component for ammonia nitrogen adsorption and ion exchange regulation. This invention introduces more active functional groups and hydrophilic interfaces conducive to microbial attachment through chitosan modification, and then co-impregnates and loads it with zeolite powder onto the surface and pores of the polyurethane sponge. This improves the composite sponge carrier's retention and enrichment capacity for anaerobic ammonia oxidizing bacteria, improves the local substrate environment during the start-up phase, promotes rapid biofilm establishment, and enhances the system's operational stability.

This invention discloses a continuous-flow anaerobic bypass IFAS-AOA device and method for treating inert high-ammonia nitrogen wastewater, belonging to the field of biological treatment technology for high-ammonia nitrogen wastewater. The device consists of three parts: a raw water storage tank, a continuous-flow anaerobic bypass AOA reactor, and a sludge-water separation system. The effluent from the end of the anaerobic process enters the aerobic zone of the AOA reactor, while the anaerobic end-mixed liquor bypasses to the anoxic zone, mixes with the aerobic end-effluent, flows through the anoxic zone, and enters the sludge-water separation system. In the anaerobic zone, endogenous denitrifying bacteria store organic matter from the raw water as an intracellular carbon source and bypass to the anoxic zone. In the aerobic zone, short-cut nitrification coupled with anaerobic ammonia oxidation serves as the main nitrogen removal pathway. In the anoxic zone, anaerobic ammonia oxidation coupled with endogenous denitrification achieves deep nitrogen removal. The existence of anaerobic bypass allows some of the mixed liquor to bypass the aerobic zone and directly bypass to the anoxic zone, thus fully utilizing the carbon source in the raw water. This invention can achieve stable short-cut nitrification and effective retention of anaerobic ammonia oxidizing bacteria, showing broad application prospects.

This invention discloses a denitrification agent for low-temperature denitrification and its preparation method, belonging to the field of denitrification technology. The denitrification agent is prepared using diatomaceous earth as the matrix framework, compounded with calcium chloride, calcium bicarbonate, chitosan, sodium lignosulfonate, and TRIS (tris(hydroxymethyl)aminomethane). The components synergistically optimize the pore structure. Chitosan and sodium lignosulfonate achieve self-assembly through hydrogen bonding and electrostatic attraction. Nitrogen oxides are removed through a dual action of alkaline absorption and electrostatic adsorption. The TRIS can be regenerated and reused after alkali washing. This invention's denitrification agent solves the problems of high reaction temperature, poor low-temperature activity, low efficiency in removing low-concentration nitrogen oxides, and easy ammonia escape in traditional SCR denitrification technology, and can meet the requirements for NO removal in flue gas from power plants. x ≤15mg / m 3 It has ultra-low emission indicators, and features excellent low-temperature activity, high denitrification efficiency, and recyclability. It is suitable for denitrification treatment of low-temperature flue gas in power plants, etc.

The application discloses a kind of organic waste composting methods for reducing nitrogen loss, belong to the technical field of organic waste resource utilization, in different stages of organic waste fermentation, calcium peroxide is added, on the one hand, can maintain the oxygen environment of heap system, inhibit denitrification;On the other hand, by regulating the pH environment in system, reduce ammonia volatilization.This double synergistic effect, continue to increase efficiency in the whole composting fermentation process, oxygen regulation breaks down the gaseous nitrogen loss caused by denitrification from the root, pH regulation effectively inhibits free ammonia volatilization, the two effects cooperate with each other, throughout the whole process, can realize the efficient nitrogen conservation of organic waste raw materials from fermentation start to stable decomposition, effectively solve the problems that existing nitrogen conservation technology is not good, cost is high, easy to cause secondary pollution and affect composting maturity etc..

In an ammonia-based carbon dioxide capturing system sections of the system are stacked to form a single column and save civil works, footprint and components. Specifically, an ammonia regenerator, a carbon dioxide water wash section and an ammonia stripper are stacked to form a single column.

The embodiment of the application provides a kind of multi-parameter collaborative SCR ammonia injection control method, device, equipment and medium, related to coal-fired flue gas denitration technical field, method includes: obtaining the inlet flue gas flow and inlet nitrogen oxide concentration of flue gas inlet flue, according to inlet flue gas flow and inlet nitrogen oxide concentration, calculate theoretical ammonia nitrogen molar ratio;According to theoretical ammonia nitrogen molar ratio and ammonia water concentration correction coefficient, calculate basic ammonia injection amount;Obtain the reaction data of ammonia water and flue gas in reactor, based on reaction data, dynamically adjust basic ammonia injection amount to obtain final ammonia injection amount, and adjust the ammonia injection amount of ammonia injection pipeline to final ammonia injection amount.The application can realize the accurate and efficient control of the ammonia injection amount of SCR ammonia water denitration system.

The application provides a water-carbon ratio control system for urea and triamine coproduction, comprising a urea synthesis loop, a triamine tail gas introduction unit and a split processing unit, the urea synthesis loop is sequentially connected with a high-pressure synthesis unit, a medium-pressure unit and a low-pressure unit; the triamine tail gas introduction unit sends triamine tail gas into the low-pressure unit to form a low-pressure recovery liquid phase, the split processing unit splits the liquid phase and separates it into a first gas phase and a first liquid phase, the first gas phase is sent to a pre-concentration separation unit to recover heat, and the first liquid phase is connected to the medium-pressure unit, so that the water bypasses the high-pressure synthesis unit, enters the low-pressure unit through the medium-pressure unit and is discharged from the system; the application solves the problem that the water in the triamine tail gas enters the high-pressure synthesis unit, resulting in the uncontrolled increase of the water-carbon ratio, maintains the water-carbon ratio in an ideal range, improves the urea synthesis conversion rate, reduces unreacted substances, reduces the steam consumption of the stripping tower and the operation load of the medium and low-pressure units, does not need to passively increase the ammonia-carbon ratio, avoids the waste of ammonia raw materials and the loss of venting.

This invention provides a semi-coke wastewater treatment device and process. The semi-coke wastewater treatment device comprises, in sequence, a semi-coke production wastewater conditioning system, an electrolytic flotation system, a freeze crystallization system, a salt phase conditioning system, a high-temperature wet oxidation system, and an ammonia nitrogen stripping and distillation system. The freeze crystallization system is connected to an aqueous phase conditioning system, a BDD electro-oxidation system, and a biochemical system. The ammonia nitrogen stripping and distillation system is connected to the biochemical system. This invention effectively solves a series of technical problems in existing semi-coke wastewater treatment devices, such as lengthy process flows, high equipment investment and operating energy consumption, and clogging of the ammonia stripping and phenol removal unit due to phenol polymerization and coking, and oil adhesion. This invention also provides a semi-coke wastewater treatment process.

This invention relates to a method and system for precise ammonia injection, belonging to the field of flue gas denitrification technology. The method first obtains the performance parameters of the SCR catalyst, establishes an automatic control model including normal and abnormal operating conditions, then selects overall or zoned control of the ammonia injection grid based on the flue gas flow field distribution, calculates the ammonia injection rate by combining inlet flue gas data and catalyst parameters, and performs closed-loop feedback adjustment of the ammonia injection rate using outlet flue gas data. The system includes an automatic control model, a data detection and collection system, a control system, and an ammonia injection grid. The data detection and collection system adopts in-situ rapid measurement technology, which can collect inlet and outlet flue gas parameters in real time. This invention can precisely control the ammonia injection rate, reduce ammonia slip, reduce ammonium salt formation, extend the service life of the catalyst and equipment, and stably meet the ultra-low emission requirements of flue gas.

This utility model relates to an anti-clogging reactor for the resource recovery and preparation of ammonium sulfate from high-concentration ammonia-containing waste gas. The reactor body includes an absorption zone and a crystallization zone from top to bottom, with the crystallization zone and the absorption zone connected. The absorption zone is located above the liquid surface, and the crystallization zone is located below the liquid surface. The top of the absorption zone has a tail gas outlet, and the bottom of the crystallization zone has a crystal slurry outlet. An external Venturi reaction zone is located below the absorption zone of the reactor body, connected to the reactor body. The Venturi reaction zone has an inlet for the ammonia-containing waste gas and an inlet for the circulating absorbent liquid. The external Venturi reaction zone forms a primary absorption, reducing the intensity of the absorption reaction within the reactor and significantly improving the anti-clogging capability.

The application discloses a kind of dispersing water supplementing devices for coastal plain river network direct ammonia oxidation denitrification of reclaimed water, including the pretreatment tank, direct ammonia oxidation device and water supplementing device connected in sequence, the upper electrode and lower electrode with longitudinal alignment hole are horizontally arranged in funnel-shaped desalination settlement area of the bottom of pretreatment tank, aeration disc is arranged at the top of desalination settlement area, flocculating agent storage tank is arranged in the upper part of pretreatment tank, its injection pipe is immersed below water surface, desalination settlement area is connected with direct ammonia oxidation device by communicating pipe, and the filler filled with direct ammonia oxidation microorganism is filled in the inside of direct ammonia oxidation device, the bottom of direct ammonia oxidation device is connected with water supplementing device, and water supplementing device is connected with a plurality of primary water distribution branch pipes through water distribution main pipe.The device can realize the maximization of direct ammonia oxidation unit denitrification efficiency through water supplementing front end pretreatment and water supplementing tail end treatment, and the maximization of coastal plain river network water supplementing benefit is realized through the designed dispersing water supplementing device.

This utility model relates to the field of ammonium sulfate post-treatment technology in ammonia desulfurization, and discloses a free acid neutralization device for ammonium sulfate by-products of ammonia desulfurization. The device includes a hydrocyclone, centrifuge, neutralizing agent silo, metering feeder, feeding screw, dryer, dust removal equipment, and finished product storage silo. This free acid neutralization device for ammonium sulfate by-products of ammonia desulfurization, by setting up a neutralizing agent silo and a metering feeder, utilizes the post-treatment system equipment of the ammonia desulfurization unit to achieve compliant production of free acid from the by-product ammonium sulfate. It features a simple process, low equipment investment, negligible operating costs, low failure rate, and high safety and reliability.

The application discloses a method for constructing a space-layered composite particle by salt-tropism induction and application thereof, and comprises the following steps: inoculating functional bacteria into an anaerobic ammonia oxidation granular sludge system, so that the functional bacteria and the anaerobic ammonia oxidation granular sludge form a mixed system; the functional bacteria are heterotrophic bacteria with salt-tolerant characteristics Bacillus pumilus NJUST51 strain; the mixed system is operated under anaerobic conditions, and salt is gradually added into influent, so that the salinity is increased to 0.5% to 1.0%; under the action of salt selection pressure, the functional bacteria are enriched on the surface of the granules to form a space-layered structure, so that a composite granule system is constructed. The application realizes stable construction by salt-tropism induction, improves the salt resistance and toxicant resistance stability of the anaerobic ammonia oxidation system, and expands the application range of the system in treatment of high-salinity and organic-toxicity industrial wastewater.

This application provides a method, apparatus, equipment, and medium for predicting mercury concentration at the outlet of an ammonia-based desulfurization system. The method includes collecting historical operating data of the ammonia-based desulfurization system and corresponding outlet mercury concentration data, preprocessing the data to obtain time-series training samples of key feature subsets; constructing a dual-stream parallel prediction model, including a first prediction branch and a second prediction branch; constructing a dynamic confidence gating unit to extract state features reflecting the fluctuation of slurry composition and the severity of load changes in the time series, and calculating the dynamic confidence weights of the prediction output of the first prediction branch and the calculation results of the second prediction branch, then weighted and fused to obtain the final predicted outlet mercury concentration value; during training, training the model based on a constructed hybrid loss function containing prediction error terms and physical consistency constraint terms; collecting real-time operating data of the ammonia-based desulfurization system, inputting it into the trained prediction model, and outputting the predicted outlet mercury concentration value for future times.

The present application relates to a process for producing synthetic ammonia by using hydrogen-containing tail gas, comprising the following steps: S1: sodium cyanide tail gas is pressurized, then heated and water-cooled. S2: the impurity-removed tail gas is desulfurized. S3: the desulfurized tail gas is mixed with chlor-alkali tail gas, the mixed gas is heated and deoxidized. S4: the deoxidized tail gas is pressurized and enters a PSA (pressure swing adsorption) device for pressure swing adsorption treatment, obtaining high-purity hydrogen. In the PSA device, dehydrating, carbon dioxide, methane, carbon monoxide and nitrogen adsorbents are sequentially arranged. The carbon dioxide adsorbent is activated carbon modified by carbonate and strong alkali, and the nitrogen adsorbent is 13X zeolite molecular sieve modified by Na + and Ba 2+ and Ca 2+ ion exchange. S5: nitrogen reacts with the high-purity hydrogen obtained in step S4 to generate ammonia. The present application can improve the adsorption capacity of the adsorbent for impurity gas, thereby reducing the replacement frequency of the adsorbent, prolonging the service period and service life of the adsorbent, and improving the production efficiency.

The present application belongs to the technical field of oil and gas field produced water treatment, and particularly relates to an ammonia nitrogen treatment system and method for oil field sulfur-containing produced water. The method comprises the following steps: sending the oil field sulfur-containing produced water into a first buffer pool, reducing sulfides through two-stage aeration of a cyclone aerator and an aeration nozzle device, overflowing from the first buffer pool to a second buffer pool when the first buffer pool reaches a water outlet height, and removing ammonia nitrogen by adding an ammonia nitrogen remover through a conventional dosing port of a dosing device. The present application fully utilizes the characteristics of aeration sulfur removal, and through the addition of a targeted chemical agent and the control of key parameters, purifies and softens the oil field sulfur-containing produced water in one step. After treatment, the water quality only needs to be further filtered by two stages of fine filtration, and the outlet water quality directly meets the steam boiler feed water requirements.

This invention discloses a method for SCR denitrification control of sintering flue gas based on operational cost optimization, comprising the following steps: S1, establishing an equation for the required heating gas flow rate for SCR denitrification of sintering flue gas based on actual production performance; S2, establishing an ammonia-nitrogen molar ratio model based on SCR denitrification production data of sintering flue gas; S3, obtaining the ammonia consumption based on the ammonia-nitrogen molar ratio model; S4, establishing an SCR denitrification operating cost equation based on the ammonia consumption and heating gas flow rate; S5, optimizing the SCR reaction temperature based on the SCR denitrification operating cost equation, and obtaining the optimized heating gas flow rate and ammonia consumption accordingly; S6, controlling the SCR denitrification of sintering flue gas based on the optimized data from S5. This invention calculates the lowest-cost heating gas and ammonia injection rates based on the actual operating data of the sintering flue gas SCR denitrification device, thereby achieving optimal SCR denitrification operating costs.

The invention discloses a method for synergistically preparing magnesium ammonium phosphate by treating ammonia-nitrogen wastewater with phosphate tailings, which comprises the following steps: roasting the phosphate tailings at high temperature to obtain roasted ore; the obtained roasted ore is subjected to digestion treatment, CO2 is introduced into ore pulp for carbonization, and the CO2 comes from roasting waste gas CO2 and carbon-containing flue gas; performing solid-liquid separation to obtain a first filtrate and a first filter residue, using the first filter residue to recover calcium, and using the first filtrate to treat ammonia-nitrogen wastewater; adding a phosphorus source and ammonia-nitrogen wastewater into the first filtrate, adjusting the pH value, and filtering after reaction to obtain a second filtrate and a second filter residue; the ammonia nitrogen content of the second filtrate is detected through Nessler's reagent spectrophotometry, and the ammonia nitrogen removal standard is met; and drying the second filter residue at low temperature to obtain a magnesium ammonium phosphate product. The method is low in production cost, high in product value and high in resource utilization rate, ammonia nitrogen in the wastewater can be efficiently removed, the environmental wastewater discharge standard is met, efficient value-added utilization of industrial by-products is achieved, and meanwhile the prepared magnesium ammonium phosphate product meets the industrial standard.

This invention relates to a method for the resource utilization of ammonia-containing waste generated during beryllium smelting, belonging to the technical field of wastewater and waste residue treatment and resource utilization. The method includes: mixing aluminum ammonium vanadium slag with beryllium washing wastewater; mixing the resulting aluminum ammonium vanadium beryllium solution with a calcium-containing transforming agent to obtain aluminum-calcium slag and aluminum ammonium vanadium purified solution; mixing solution A with beryllium precipitation wastewater and adding a calcium-containing alkaline substance to obtain a conditioning solution and gypsum slag; adding a decalcifying agent to the conditioning solution for precipitation and decalcification to obtain decalcified slag and decalcified solution; stripping the decalcified solution to obtain ammonia water and ammonia stripping mother liquor; solution A is an aluminum ammonium vanadium beryllium solution and / or aluminum ammonium vanadium purified solution; or, mixing the aluminum ammonium vanadium purified solution with beryllium precipitation wastewater and evaporating and crystallizing to obtain ammonium salts. This method fully utilizes the ammonia resources in the ammonia-containing waste generated during beryllium smelting, preparing ammonium salts or ammonia water, achieving full recycling of ammonia nitrogen in the production process.

The present application relates to a kind of ammonia nitrogen temperature homologous state under denitration real-time monitoring method and equipment thereof, the present application discloses homologous state under denitration real-time monitoring method and equipment, the present application is integrated by encapsulation ammonia nitrogen temperature homologous integrated measuring point, realize the synchronous collection of flue gas ammonia concentration, nitrogen oxide concentration, flue gas temperature in the same spatial position, after nonlinear temperature drift correction based on same point real-time temperature, construct "static base quantity+dynamic increment+adaptive correction" three-level ammonia injection amount calculation logic, complete closed-loop monitoring loop is formed by collocation grid partition control.This application eliminates sampling inherent error from source, can quickly respond to working condition change, give consideration to nitrogen oxides emission standard and ammonia escape control, effectively reduce ammonia consumption and operation risk, improve the stability and economy of denitration system operation, adapt to industrial denitration long-period continuous operation demand.

The utility model belongs to tail gas recovery processing technical field, concretely speaking is melamine production tail gas recovery processing device, including bottom plate, the bottom plate top solid connection has the storage bucket with first water pump, first water pump and storage bucket are linked through pipeline, first water pump output end installation has the feed pipe, the bottom plate top solid connection has the processing jar, the feed pipe is linked with processing jar, the feed pipe end is equipped with the spray subassembly, processing jar side wall solid connection has the motor, processing jar upper rotation is connected with the pivot, pivot solid connection in motor output end, processing jar inside rotation is connected with the stirring shaft, the stirring shaft is connected with the pivot through bevel gear group transmission, through above -mentioned structure, set up motor, pivot, stirring shaft, stirring rod and discharge solenoid valve, can make the ammonium salt solution in the processing jar temporary storage, and the solution is stirred to improve the evenness of the mixing between the solution, to improve the recovery effect of ammonia element in tail gas.

The present invention concerns an industrial chemical process (400f) and an apparatus for carrying out that process. The chemical process integrates into a single, combined method: (i) a method (303, 304) of producing iron and / or manganese from their ores, and (ii) a method (205a, 205b, 207, 208, 209) of producing an oxide or hydroxide of at least one of calcium, magnesium and iron from another ore respectively comprising a carbonate mineral of at least one of calcium, magnesium and iron. This combined method has the iron and / or manganese ore and the other ore comprising the carbonate mineral as its only essential ingredients, with common salt and / or water as optional extra ingredients. The combined method produces iron and / or manganese in elemental form, an oxide or hydroxide derived from the carbonate mineral, and oxygen as its corresponding products. If the iron and / or manganese ore also comprises a siliceous mineral, the method may also produce an alkaline mixture comprising sodium silicate as a co-product. Salt and water act as intermediaries to produce these end-products, but are only consumed if supplied in excess. An amount of sodium oxide, hydroxide and / or carbonate determined by the amount of salt consumed may be produced as a co-product, along with a corresponding amount of at least one of chlorine and hydrochloric acid. An amount of hydrogen determined by the amount of water consumed may also be produced as a co-product, along with an increased amount of oxygen. The iron, manganese and oxygen produced may all be used in steelmaking. Any excess oxygen may be safely vented to atmosphere. The oxide or hydroxide derived from the carbonate mineral may be used in cement manufacture, as a flux in steelmaking and / or as an ingredient in the manufacture of soda-lime glass. The alkaline mixture comprising sodium silicate may be used as an alkaline activator for an alkaline activated or geopolymer cement. The sodium carbonate may be used in the manufacture of soda-lime and / or borosilicate glass, for example. The chlorine and / or hydrochloric acid may be used in the manufacture of chlorinated organic compounds, for example. The hydrogen may be used as a fuel in a hydrogen economy. The method of the invention requires no nett input of heat because the chemical reactions it involves are exothermic overall. It also consumes no fossil fuels and has electricity as its only energy requirement. Thus if the electricity is produced from a source of renewable energy, this method produces no greenhouse gas emissions. In some embodiments, the method can even have a negative carbon footprint overall. The invention is intended to replace existing techniques for producing iron and / or manganese from their ores, including hydrogen-DRI, the calcination of limestone and other carbonate minerals, both in cement manufacture and in the production of lime for other purposes, and the ammonia-soda, or Solvay, process for the production of sodium carbonate. The invention therefore has the potential to eliminate up to about 20% of anthropogenic carbon dioxide emissions. [Fig. 9B]

The utility model provides a cement SCR ammonia compensation spray gun relates to ammonia compensation spray gun field, including the spray gun main part, including the gun body, the spray head who communicates in the one end of gun body, set up in the other end of gun body and be used for to the filter of ammonia water solution miscellaneous component, set up in one side of filter miscellaneous component and be used for conveying ammonia water's liquid delivery pipe, and communicate in the bottom of gun body and be used for conveying compressed air's gas delivery pipe, filter miscellaneous component, including the cap, set up in the miscellaneous cover of cap bottom, the utility model discloses can filter out the impurity in ammonia water solution efficiently through the additional filter miscellaneous component, through the liquid delivery pipe cooperation liquid inlet pipe can make ammonia water enter filter cartridge and filter, filter cartridge can intercept the impurity particle in ammonia water solution, and pure ammonia water then passes through the connecting cylinder and liquid outlet pipe and enters the gun body, ensure that ammonia water passes through the spray head and atomizes into tiny particle smoothly, thereby improved denitration efficiency, effectively alleviated the situation that the serious influence denitration effect because of the blockage.

The present invention relates to a method for producing nitrile by controlling the input pressure of a spraying liquid and a production apparatus. The method can atomize the spraying liquid, increase the contact area with ammonia, and improve the mass transfer efficiency. The method for producing nitrile includes a step of producing a reaction product containing nitrile by subjecting a hydrocarbon raw material to an ammoxidation reaction (referred to as a reaction step), and a step of spraying a spraying liquid to the reaction product by a spraying device to cool the reaction product (referred to as a cooling step), wherein the spraying device includes a spraying liquid inlet, a first spraying pipe in fluid communication with the spraying liquid inlet, a plurality of second spraying pipes in fluid communication with the first spraying pipe and extending to both sides of the first spraying pipe perpendicularly thereto, a plurality of third spraying pipes in fluid communication with the second spraying pipes and extending to both sides of the second spraying pipes perpendicularly thereto, and a nozzle at the end of the third spraying pipes and in fluid communication therewith, and wherein the input pressure of the spraying liquid of the spraying liquid inlet is controlled to 0.06-1.00 MPaG in the cooling step.

A catalytic article for treating an exhaust stream, which comprises -a substrate, -a coating layer, comprising a first catalyst containing a precious metal component and a second catalyst containing a molecular sieve component, in a first coating configuration; or -a substrate, -a first coating layer, which comprises a first catalyst containing a precious metal component, and -a second coating layer, which covers at least part of the first coating layer and comprises a second catalyst containing a molecular sieve component, in a second coating configuration; wherein the coating layer in the first coating configuration or the second coating layer in the second coating configuration has inter-particle pores at a pore ratio of 5.7% or more respectively. It also relates to a process for preparing the catalytic article by using a pore-forming agent in the slurry for depositing a coaing layer, and to a system for treating an exhaust stream comprising the catalytic article.

To provide a method capable of simply manufacturing an ammonia synthesis catalyst carrier including hydride containing oxide having a perovskite type structure.SOLUTION: A method for manufacturing an ammonia synthesis catalyst carrier comprises the steps of: dispersing TiH2 particles into a solution obtained by dissolving the hydroxide or nitrate of an alkali earth metal element in a solvent so that the content of the alkali earth metal element in a carrier is within a range of 1-10 mass% by metal conversion and carrying the alkali earth metal element on the surface of the TiH2 particle by removing the solvent; and obtaining the carrier consisting of the TiH2 particles including hydride containing oxide ATiO3-xHx [where in the formula, A represents the alkali earth metal element, and 0<x≤1] having a perovskite type structure and formed on the surface by calcining the TiH2 particles having the alkali earth metal element carried on the surface in an inert atmosphere or a reducing atmosphere.SELECTED DRAWING: None

An ammonia supply device (100) includes an ammonia supply system (110), a joint (120) having a pipe body (210) with a first opening (212) connected to the ammonia supply system (110) and a second opening (214) capable of being attached to and detached from an ammonia consuming device (10), a water supply port (220) provided between the first opening (212) and the second opening (214) in the pipe body (210) and connected to a water supply source (water tank (132)), a drain port (230) provided between the first opening (212) and the second opening (214) in the pipe body (210), and an opening and closing valve (30) that opens and closes the first opening (212).

This application relates to a method for removing ammonia (NH3) from a gas generated from a pulping apparatus (100). The method includes generating an untreated non-condensable gas containing ammonia (NH3) in the pulping apparatus (100) and transferring at least some of the untreated non-condensable gas to a scrubber (200) containing an aqueous washing solution (130, 140). The method includes adding a compound capable of lowering the pH of the washing solution to the washing solution (130, 140), and in the scrubber (200), contacting the untreated non-condensable gas with the washing solution (130, 140) to react the ammonia (NH3) in the untreated non-condensable gas with the washing solution to generate a clean non-condensable gas and ammonium (NH4). + This application also relates to a pulping apparatus, including devices for performing the method.