540 results about "Ammonia production" patented technology

A green ammonia production hydrogen load prediction method based on sparse attention variational Bayes comprises the following steps: acquiring historical data of a green ammonia electrolysis hydrogen production industry through an acquisition sensor, and dividing the historical data into a training set, a verification set and a test set; performing standardization processing on the training set, and constructing an SVAE soft measurement training model; determining a final objective function suitable for SVAE; and performing real-time online prediction on the output target variable by using the current input characteristic variable by adopting the trained SVAE. The SVAE combines CNNs, PSSAM and a cross attention mechanism, and captures a long-term dependency relationship and a complex mutual relationship in industrial data. An optimized objective function is formulated in combination with variational reasoning and a Monte Carlo method and is used for offline training. The SVAE has remarkable advantages in the process of accurately predicting the hydrogen flow and optimizing the production process of the green ammonia, the production efficiency is improved, and the energy consumption is reduced.

The invention provides a synthetic ammonia production load intelligent regulation and control method and system based on wind and light prediction, and relates to the technical field of energy and chemical production, and the method comprises the steps: collecting wind and light data and synthetic ammonia process data, and predicting a power generation power curve and a process parameter trend through a double-flow variational auto-encoder in combination with a residual connection mechanism; the method comprises the following steps: determining a technological parameter constraint and a safety boundary, establishing a technological parameter safety constraint model, obtaining a load regulation space, generating an optimal load instruction based on an optimization algorithm, and realizing intelligent load regulation and control through cascade PID (Proportion Integration Differentiation). According to the invention, accurate dynamic regulation and control of the load of the ammonia synthesis device are realized, and the wind and light absorption capability and the production efficiency are improved.

The utility model provides a compound device for providing feed gas for preparing green ammonia from new energy and a green ammonia synthesis system. The composite device comprises a deep cooling air separation nitrogen generation subsystem, a hydrogen supply subsystem and a main heat exchanger, and the hydrogen supply subsystem comprises a water electrolysis hydrogen generation unit, a first hydrogen compressor, a second hydrogen compressor, a hydrogen storage tank and a hydrogen conveying pipeline. The hydrogen conveying pipeline comprises a first hydrogen conveying pipeline, a second hydrogen conveying pipeline and a third hydrogen conveying pipeline; the main heat exchanger is a multi-channel heat exchanger and comprises a first flowing channel used for flowing of a first medium and a second flowing channel used for flowing of a second medium, the second hydrogen compressor is connected with the hydrogen storage tank through the first flowing channel, and the hydrogen storage tank is connected with the third hydrogen conveying pipeline through the second flowing channel. The composite device provided by the utility model can ensure the supply stability of the raw material hydrogen of the ammonia production subsystem, and solves the technical problem that the hydrogen supply is unstable in the existing green ammonia synthesis process.

The invention relates to the technical field of industrial waste gas treatment, and discloses an acid gas treatment device and method for synthesis ammonia production, the acid gas treatment device for synthesis ammonia production comprises an absorption tower, a spraying system and a filler layer, the spraying system and the filler layer are installed in the absorption tower, and a receiving disc is arranged below the filler layer; the receiving disc comprises a plurality of annular plates which are vertically and coaxially distributed, the diameters of the annular plates are gradually reduced from top to bottom, the bottom of the annular plate on the lowermost side is fixedly connected with a drainage ring, the outer wall of the lower portion of the drainage ring is sleeved with a collecting cylinder, the inner wall of the drainage ring is fixedly connected with a flow slowing cylinder, and the lower portion of the flow slowing cylinder extends into the collecting cylinder. The solvent flows on the annular plate, and after the flow speed of the solvent is slowed down through the flow slowing cylinder, the solvent and impurities form a falling speed difference in the collecting cylinder, so that the impurities can effectively precipitate at the bottom in the collecting cylinder and are prevented from flowing to a filtering system of the recycling box along with the solvent, the burden of the filtering system is relieved, and the recycling efficiency of the solvent is improved.

The utility model discloses hydrogen purification equipment and an ammonia production system, and relates to the technical field of hydrogen purification, and the hydrogen purification equipment comprises an air separation device, a hydrogen production device, a heat exchange part and a filtering part; the air separation device is provided with a refrigerant discharge pipe; the hydrogen production device is provided with a hydrogen discharge pipe; the heat exchange part is provided with a refrigerant inlet end, a hydrogen inlet end and a hydrogen outlet end, the refrigerant discharge pipe is communicated with the refrigerant inlet end, the hydrogen discharge pipe is communicated with the hydrogen inlet end, and a refrigerant discharged by the refrigerant discharge pipe and hydrogen discharged by the hydrogen discharge pipe can be subjected to heat exchange; the filter is provided with an inlet end and an outlet end which are mutually communicated; the inlet end is communicated with the hydrogen outlet end; according to the technical scheme, the utilization rate of hydrogen is increased.

The invention provides an improved ammonia production system based on a temperature swing adsorption principle. The improved ammonia production system comprises a water electrolysis hydrogen production module, a deep cooling air separation nitrogen production module, a multi-stage ammonia synthesis tower module and a double-bed circulating adsorption separation ammonia module, the water electrolysis hydrogen production module and the deep cooling air separation nitrogen production module provide raw material gas for the multi-stage ammonia synthesis tower module through a mixer, low-grade waste heat of a multi-stage ammonia synthesis tower serves as a heat source of the double-bed circulating adsorption separation ammonia module, and the double-bed adsorption separation ammonia module is connected with the multi-stage ammonia synthesis tower. The working conditions of an adsorption bed of the double-bed ammonia adsorption and separation module comprise an adsorption working condition and a desorption working condition, the adsorption bed alternately performs the adsorption working condition and the desorption working condition within the operation time, and low-grade waste heat from a multi-stage ammonia synthesis tower is used for driving to perform separation operation on ammonia synthesis gas so as to obtain high-purity ammonia; according to the invention, the operation pressure in an ammonia product separation project can be effectively reduced, circulation is formed, and the purity and the recovery rate of the obtained ammonia product are not reduced while the waste heat in the system is further utilized.

An ammonia production method involves producing ammonia from nitrogen molecules, in a production device for performing electrolysis, in the presence of a metal complex and a solid catalyst in a cathode, by providing electrons from a power source, protons from a proton source, and nitrogen molecules from a means for supplying nitrogen gas, and by providing hydrogen molecules by sending hydrogen molecules to an anode including sending hydrogen gas produced at the cathode to the anode. Concerning a metal complex and a solid catalyst, as the metal complex, rac-ethylenebis(4,5,6,7-tetrahydro-1-indenyl) zirconium dichloride or the like is used, and as the solid catalyst, a metal catalyst or the like is used.

The invention discloses a preparation method and application of a molybdenum monatomic photocatalyst for producing ammonia through nitrogen reduction, and belongs to the technical field of photocatalytic material preparation. According to the preparation method, molybdenum hexacarbonyl is taken as a metal precursor, and molybdenum single atoms are introduced into a covalent organic framework material sp2c-COF by adopting a solvothermal synthesis method, so that the covalent organic framework photocatalyst is obtained; according to the covalent organic framework photocatalyst, molybdenum single atoms are anchored, the local coordination environment of a covalent organic framework is finely controlled, the unique electronic structure and catalytic activity of the molybdenum single atoms can effectively optimize electron cloud distribution of COFs, the adsorption and activation capacity on nitrogen molecules is enhanced, and the covalent organic framework photocatalyst has the advantages that the covalent organic framework photocatalyst is high in catalytic activity and high in catalytic activity; the covalent organic framework photocatalyst can effectively inhibit the compounding of photo-induced electron-hole pairs so as to prolong the service life of photo-induced electrons, so that the covalent organic framework photocatalyst has excellent ammonia production performance, and the ammonia production activity can reach 372.6 [mu] mol.g <-1 >. H <-1 > under the conditions of visible light and pure water.

The invention relates to the technical field of industrial process on-line monitoring, in particular to a multi-parameter on-line collaborative monitoring method in ammonia water production, which comprises the following steps: preprocessing a signal; obtaining an equivalent conductivity value after temperature compensation and a corrected pH value after comprehensive compensation; according to the equivalent conductivity value and the corrected pH value, carrying out parallel calculation to obtain a first concentration presumption value and a second concentration presumption value; comparing the deviation with a preset rationality threshold value to check the consistency of the monitoring system; carrying out weighted fusion on the two values by utilizing the dynamic weight, and outputting a final fusion concentration value; under the abnormal working condition, a potential fault source is identified, and a reliable standby data source is adaptively selected to output a temporary concentration value. By means of temperature compensation, concentration presumption, data fusion and fault-tolerant processing, the system can accurately monitor the concentration of ammonia water in real time and automatically conduct self-correction under the abnormal condition, and high-precision and high-reliability monitoring of the production process is guaranteed.

A compression unit for ammonia comprising a multi-stage compressor, including a first set of compressor stages adapted to compress a syngas containing hydrogen and nitrogen; and a second set of compressor stages adapted to compress a refrigerant of a refrigerant circuit. Described herein is also an ammonia production system including the ammonia compression unit and a method.

The invention discloses a cobaltosic oxide catalyst doped with lanthanide metal, a preparation method of the cobaltosic oxide catalyst and application of the cobaltosic oxide catalyst to ammonia production through nitrate reduction. The method comprises the following steps: carrying out hydrothermal reaction on cobalt nitrate hexahydrate and a lanthanide metal salt precursor in a mixed system of isopropanol and glycerol, and then carrying out high-temperature calcination to prepare the lanthanide metal-doped cobaltosic oxide catalyst. The preparation method disclosed by the invention is simple to operate and low in cost, the prepared lanthanide metal-doped cobaltosic oxide catalyst shows excellent Faraday efficiency, ammonia yield and cycling stability in an electro-catalysis nitrate reduction reaction, a traditional path of preparing ammonia from nitrate is broken through, and more efficient performance is realized.

The invention belongs to the field of photoelectrocatalysis ammonia production, and particularly discloses a Ti (at) TiO2 array (at) CuxPt alloy composite electrode, preparation of the Ti (at) TiO2 array (at) CuxPt alloy composite electrode and application of the Ti (at) TiO2 array (at) CuxPt alloy composite electrode to photoelectrocatalysis NO3 <-> reduction ammonia production, and the Ti (at) TiO2 array (at) CuxPt alloy composite electrode comprises a Ti substrate, a TiO2 nanosheet array growing on the surface of the Ti substrate in an in-situ mode and nano CuxPt alloy particles distributed on the TiO2 nanosheet array in a dispersed mode; tiO2 nanosheets in the TiO2 nanosheet array grow in the Z-axis direction of the Ti substrate; and a heterogeneous interface exists between the nano CuxPt alloy particles and the TiO2 nanosheet array. The self-supporting material provided by the invention has excellent NH3 production activity, Faraday efficiency and stability.

The invention relates to copper-modified wheel-type tungsten phosphate, a preparation method of the copper-modified wheel-type tungsten phosphate and application of the copper-modified wheel-type tungsten phosphate in production of ammonia through electro-catalysis of nitrite reduction, and provides the copper-modified wheel-type tungsten phosphate, the preparation method of the copper-modified wheel-type tungsten phosphate and application of the copper-modified wheel-type tungsten phosphate in production of ammonia through electro-catalysis of nitrite reduction. According to the invention, the transition metal copper is introduced on the basis of K28Li5 [H7P8W48O184] 92H2O (hereinafter referred to as P8W48). K12Li13 [Cu20Cl (OH) 24 (H2O) 12 (P8W48O184)]. 22H2O (hereinafter referred to as Cu20P8W48) is formed through self-assembling and positioning, and the K12Li13 [Cu20Cl (OH) 24 (H2O) 12 (P8W48O184)]. 22H2O is applied to reduction of nitrite through electro-catalysis to prepare ammonia.

The invention belongs to the technical field of denitration agents, and particularly discloses a composite denitration agent for an out-of-furnace phase change process and a preparation method of the composite denitration agent. The preparation method comprises the following steps: mixing 60-80 parts of urea, 20-30 parts of a hydrolysis accelerant and 5-15 parts of amino modified zeolite to obtain the composite denitration agent for the external phase change process; the hydrolysis accelerant is coated ammonium carbamate, and the amino-modified zeolite is obtained by modifying an amino-containing silane coupling agent. The prepared composite denitration agent can promote forward proceeding of urea hydrolysis, the conversion rate of urea is increased, and the ammonia yield is increased; the amino modified zeolite can adsorb and activate urea molecules, urea decomposition is transferred to a low temperature, the activation energy of urea decomposition is remarkably reduced, and the reaction rate is increased.

Systems and methods for synthesizing ammonia include one or more electrochemical hydrogen pumps to recover excess hydrogen gas from the ammonia synthesis product stream. The systems and methods improve overall yield and efficiency of the ammonia production process by separating and purifying hydrogen gas that otherwise would be lost.

The invention discloses a deep sea floating type ammonia production and storage system and method, and the system comprises an offshore floating type ammonia production ship which is located on the sea surface and is used for producing liquid ammonia; the wind power generation device is positioned above the sea surface and is used for supplying energy required for producing liquid ammonia to the offshore floating type ammonia production ship; the underwater flexible liquid ammonia storage device is located below the sea surface and used for storing liquid ammonia produced by the offshore floating type ammonia production ship, and the water pressure provided by the seawater depth of the installation position of the underwater flexible liquid ammonia storage device is larger than the ammonia saturated vapor pressure corresponding to the seawater temperature of the installation position; liquid ammonia produced by the offshore floating ammonia production ship is conveyed into the underwater flexible liquid ammonia storage device through a pipeline to be stored; according to the offshore floating type production ammonia storage ship containing the underwater flexible liquid storage device, the deepwater pressure and the temperature environment are fully utilized, the flexible non-metal bag is adopted as the liquid ammonia storage device, and therefore the manufacturing cost of the FPSO under the same ammonia production capacity is lower, and the liquid ammonia storage cost is reduced.

Disclosed is a system and method for effectively converting nitrogen pollutants, including nitrates, into ammonia. The system includes an electrolyzer unit capable of facilitating conversion of nitrates to ammonia. The resulting mixture leaving the cathodic compartment, including ammonia and any unreacted nitrogen pollutants, is directed to an ammonia separator where ammonia is separated from any unreacted nitrogen pollutants of the stream. Residual nitrogen pollutants are then recirculated back to the electrolyzer unit, enabling the system to operate in a continuous loop.

The invention relates to a high-entropy oxide stabilized noble metal monatomic catalyst as well as a preparation method and application thereof, the stability of noble metal monatomic is effectively enhanced by utilizing a defect structure and lattice distortion of a high-entropy oxide (CePrYZrHf) Ox substrate, so that the loading capacity of the noble metal monatomic is higher than that of a low-entropy oxide CeO2. By using a high-entropy oxide (CePrYZrHf) Ox carrier, precious metal single atoms show excellent activity and long-acting stability in an electro-catalysis nitrate radical reduction reaction. Compared with the prior art, the catalyst disclosed by the invention is simple and convenient in preparation method and controllable in cost, has a wide prospect in industrial application, and is particularly suitable for environment-friendly electro-catalytic reaction systems such as efficient ammonia production and the like.

The invention discloses a carboxyl-functionalized porous organic polymer, a preparation method thereof and application of the carboxyl-functionalized porous organic polymer in ammonia gas adsorption separation and sensing. The polymer is obtained by free radical polymerization, hydrolysis and acidification of monomers containing vinyl and ester groups, and has a mesoporous structure and a skeleton carboxyl functional group. The preparation method is simple and mild in condition. The polymer has excellent adsorption selectivity and high adsorption capacity on ammonia gas, the static adsorption capacity on the ammonia gas under the conditions of 298 K and 1 bar is not lower than 6.5 mmol / g, the ammonia gas can be efficiently separated from NH / N / H and NH / COs mixed gas, and the cycling stability is good. An ammonia gas sensor prepared by taking the graphene oxide as a sensitive material has linear or piecewise linear response to ammonia gas with the concentration of 1-100 ppm at room temperature, the detection limit is lower than 30 ppb, and the selectivity is excellent. The invention overcomes the defects of the existing ammonia gas adsorption separation material and sensor, has important significance for optimizing the ammonia production process and reducing pollution, and has wide application prospects.

The invention discloses an ammonium carbamate denitration agent pyrolysis box for preventing crystallization. The ammonium carbamate denitration agent pyrolysis box comprises a box body, a conveying belt, a first heating assembly and a second heating assembly. The ammonium carbamate powder is heated from the upper portion of the ammonium carbamate powder through the first heating assembly, the ammonium carbamate powder is heated from the lower portion of the ammonium carbamate powder through the second heating assembly, it is effectively guaranteed that ammonium carbamate is completely decomposed on the conveying belt, and the defect that a medium can only be heated and decomposed from a single face through traditional heating equipment is overcome. Ammonium carbamate powder is fully pyrolyzed on the conveying belt, so that the problem of pipeline blockage caused by caking of ammonium carbamate in the flue gas denitration process is avoided. The box body can ensure that ammonium carbamate is fully decomposed to generate enough ammonia gas for denitration reaction, so that the denitration efficiency is improved. As the ammonium carbamate is directly decomposed in the box body, the ammonia preparation method does not need to be carried out under a high-temperature condition like the traditional urea ammonia preparation method, the ammonia preparation efficiency is improved by 5.9%-23.5% and averagely improved by 14.70% compared with the urea, and the ammonia preparation energy consumption is reduced by 48.0%-65.0%.

The invention provides a maritime distributed green ammonia production scheduling system and method based on intelligent management, and relates to the technical field of maritime renewable energy utilization, and the system comprises a distributed ammonia production platform which is used for the distributed production of maritime green ammonia. A renewable energy power generation device, water electrolysis hydrogen production equipment, a synthetic ammonia reactor, a green ammonia energy storage device and an ammonia production platform sensor network are configured; the multifunctional ship node is used for production, transportation and consumption of green ammonia and is provided with a green ammonia transportation carrier, an offshore production node expansion unit, a green ammonia fuel consumption terminal and a ship state sensor; the intelligent green ammonia management platform integrates a data transmission module, a multi-target optimization scheduling module, a fault prediction and emergency response module and a supply chain management module, and is used for communicating with an ammonia production platform and ship nodes through the Internet of Things technology, so that intelligent closed-loop management of green ammonia production, transportation and consumption can be realized; the production scheduling efficiency and the energy utilization rate are improved, and the transportation cost is reduced.

The invention relates to a urea hydrolysis ammonia preparation reaction device, belongs to the technical field of ammonia preparation reaction, and aims to solve the problems that a scraper blade is in frictional contact with a hard crystal layer for a long time, blade abrasion, structural deformation and the like are easy to occur, and the scraper blade needs to be replaced by dismounting related parts after shutdown, the urea hydrolysis ammonia preparation reaction device comprises a reaction tank, and a hollow pipe is rotatably connected in the reaction tank; a driving part is installed at one end of the reaction tank, the driving part is in transmission connection with the hollow pipe, an air pump is further installed at one end of the reaction tank, the output end of the air pump is rotationally connected with the hollow pipe, a pushing part is installed in the hollow pipe, and transverse pipes are installed on the two sides of the hollow pipe in a communicating mode. When the scraper is used, the abraded first scraper can be retracted into the shell, meanwhile, the standby second scraper is pushed out and positioned, the whole process is completed in the running state of the device, the production continuity and the equipment utilization rate are greatly improved, and the labor intensity of workers and the operation and maintenance cost are remarkably reduced.

The application discloses an energy-saving, efficient and adjustable alcohol pre-gas ammonia production process method, and particularly comprises the following steps: S1, a raw material gas is separated from a pressurized coal gasification methanol device as alcohol pre-gas and is sent to a shift device of synthetic ammonia through a sealed pipeline; S2, when entering the shift device, the alcohol pre-gas is mixed with a crude synthetic gas to form a mixed gas, then high-pressure steam is introduced to adjust the water-gas and increase the mixed temperature, carbon monoxide is reacted with water vapor in the shift device, and hydrogen gas is prepared as a shift gas; S3, the shift gas is subjected to low-temperature methanol washing and liquid nitrogen washing, then nitrogen gas produced by air separation is added, a synthetic gas is prepared, and the synthetic gas is sent to an ammonia synthesis device. The energy-saving, efficient and adjustable alcohol pre-gas ammonia production process method is adopted, raw material gas is comprehensively utilized in an energy-saving mode, the methanol and synthetic ammonia production yield is flexibly adjusted, and enterprise benefits are improved.

The invention discloses a hydrolyzer ammonia production and denitration whole-process cooperative control method based on NOx prediction, and the method comprises the steps: collecting the real-time state parameters of the operation of a boiler, inputting the real-time state parameters into an LSTM neural network prediction model, and obtaining an SCR inlet NOx concentration prediction value which is earlier than the actual measurement; on the basis of the SCR inlet NOx concentration predicted value and in combination with the load change parameters of the boiler, an advanced ammonia demand signal is obtained through calculation; and synchronously generating an ammonia spraying optimization instruction for controlling an SCR denitration system and an ammonia production optimization instruction for controlling a hydrolyzer ammonia production system by using the advanced ammonia demand signal. The advanced ammonia demand signal capable of guiding the hydrolyzer ammonia production system and the SCR denitration system to carry out advanced actions at the same time is generated by calculating the NOx concentration predicted value at the SCR inlet, supply and demand cooperation and advanced response of the ammonia production and denitration links are achieved, and the problems of ammonia spraying control lag and ammonia supply pressure fluctuation caused by measurement delay and system isolation are effectively solved.

The invention discloses a green electricity ammonia production synthesis tower temperature control system which is arranged in a pipeline between a synthesis tower and a fused salt heating unit, a temperature acquisition end of a TC1 controller is arranged in a pipeline between fused salt electric heaters, and a signal output end of the TC1 controller is in communication connection with a lava electric heater; the temperature acquisition end of the TC2 controller is arranged in the f1 hot gas output pipeline between the fused salt heater and the synthesis tower, and the signal output end of the TC2 controller is in communication connection with the fused salt pump; a temperature acquisition end of the TC controller is arranged at an inlet of a 1 # catalytic bed of the synthetic tower; and a signal output end of the TC controller is in communication connection with an adjusting valve f0 on a process cold air pipeline of the synthetic tower and an adjusting valve f1 on a cold air pipeline of the molten salt heater. Through automatic control of the TC1TC2TC system, adverse effects caused by fluctuation of green electricity such as wind, light and the like can be completely met, and it is guaranteed that the inlet temperature of the 1 # catalytic bed of the synthesis tower is in a reasonable index.

The invention discloses a urea dissolution online control system based on particle size monitoring, and the system comprises a dividing module which is used for dividing a historical monitoring log of each monitoring point, and obtaining the historical monitoring logs of the monitoring points in the same preset ammonia production demand interval; the extraction module is used for extracting historical granularity monitoring data and historical control data in the historical monitoring log, and determining feature control data based on an association relationship between the historical granularity monitoring data and the historical control data; the evaluation module is used for obtaining a historical particle size evaluation value of the historical particle size monitoring data, performing screening according to the historical particle size evaluation value characteristic control data, obtaining preferable characteristic control data and constructing a urea dissolution control model; the generation module is used for generating a real-time granularity evaluation value according to the real-time granularity monitoring data; the control module is used for selecting a urea dissolution control model and obtaining control data, the urea dissolution efficiency is improved, and the denitration emission requirement of the power plant is guaranteed.

The invention discloses a liquid metal-based catalyst with flowable amorphous cobalt active sites as well as a preparation method and application of the liquid metal-based catalyst. The spherical gallium-based liquid metal loaded amorphous cobalt nanosheet material is synthesized by using a sodium borohydride ice bath method. Due to the optimization of the synthesis process, the amorphous cobalt nanosheets are uniformly distributed on the surfaces of the liquid gallium balls, are small in size, are high in utilization rate and are not easy to agglomerate; the intrinsic flow characteristic of the liquid metal gallium realizes the efficient reverse hydrogen overflow effect, optimizes the formation process of a catalytic reaction intermediate, and accelerates the formation of the intermediate. The composite material has the advantages of low overpotential, high Faraday efficiency, high ammonia production rate, good stability and the like during nitrate electrocatalytic reduction reaction, meets the requirements of production and use, and is low in preparation cost.

To provide a process and an apparatus for the production of hydrogen gas from ammonia, and a use of the apparatus, so that the overall process has improved modularity while the process is made simple and has the optimized cost and conversion rate.SOLUTION: The invention relates to a process for the production of hydrogen gas (4) from ammonia, thereby obtaining an effluent gas (6) including hydrogen gas. The process includes the steps of providing an ammonia feedstock stream (8) and performing at least one electrical heating and conversion step, the step including: heating in at least one electric heater (12) the ammonia feedstock stream so as to produce a heated gas stream (14); and performing in at least one adiabatic reactor (16) an endothermic cracking reaction of the heated gas stream (14). The adiabatic reactor includes at least one catalyst bed (18) performing the endothermic cracking reaction of the ammonia feedstock stream into the effluent gas.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of catalysts, and discloses a catalyst for preparing ammonia through urea hydrolysis and a preparation method thereof.The preparation method comprises the following steps that 1, after a carrier is calcined, the carrier is added into a mixed solution of a silane coupling agent and absolute ethyl alcohol to be subjected to ultrasonic treatment, the carrier is taken out and dried, and a modified carrier is obtained; (2) immersing the modified carrier into a transition metal salt solution for multiple times, after each time of immersion, firstly carrying out ultrasonic treatment, then taking out, drying and calcining, and repeating for multiple times to obtain a transition metal oxide-loaded modified carrier; and (3) adding a rare earth metal salt solution or an alkali metal salt solution into the modified carrier loaded with the transition metal oxide by several times, carrying out ultrasonic treatment and then stirring treatment after each time of addition, standing, taking out, drying and calcining after all the addition is finished, thereby obtaining the catalyst for preparing ammonia through urea hydrolysis. According to the invention, the catalytic activity, thermal stability, anti-clogging performance and anti-poisoning capability of the catalyst in the process of preparing ammonia by hydrolyzing urea are obviously improved.

According to the carbon cycle ammonia production system and method based on chemical-looping water splitting, in the carbon cycle ammonia production system based on chemical-looping water splitting, a chemical-looping carbon cycle nitrogen-hydrogen cogeneration module combines a fuel reactor and a high-temperature solid carbon dioxide electrolytic cell in a chemical-looping process, and hydrogen-nitrogen cogeneration with zero carbon emission is achieved. According to the Harbin process ammonia preparation module, multi-stage compression and intermediate cooling are carried out on raw material gas, the system energy consumption is reduced, and moisture used for a steam reactor is preheated. Then, a multi-stage reactor is adopted in the ammonia production process, heat recovery and raw material recovery are implemented, and a chemical chain product is efficiently converted into ammonia gas. The concentrating solar thermoelectric steam co-production module adopts molten salt as a working medium and is combined with a reheat return Rankine cycle containing a heat regenerator to meet the heat and electricity requirements of the system. The system utilizes a chemical-looping water splitting technology to prepare high-purity ammonia gas under a zero-carbon condition, and has the advantages of high efficiency, low emission, high resource utilization and the like.