3793 results about "Ammonia gas" patented technology

The invention relates to the technical field of flue gas treatment, in particular to a sintering flue gas denitration and dust removal integrated post-CO removal method which is specifically completed through cooperation of a sintering flue gas treatment system, and the sintering flue gas treatment system comprises a GGH heat exchanger, a desulfurization reactor, a denitration dust remover and a CO reactor which are sequentially communicated through pipelines. The CO catalyst module is a transition metal oxide CO catalyst; the cleaning device is used for cleaning ash of the CO catalyst module; the ammonia gas is sprayed into the outlet of the desulfurization reactor, so that ammonia escape is reduced, poisoning of the CO catalyst module is reduced, the catalytic efficiency of the CO catalyst module is improved, and the service life of the CO catalyst module is prolonged; the CO catalyst module is regularly subjected to air blowing and back blowing in a closed area, so that impurities such as carbon deposition on the CO catalyst module are cleaned, more active sites are exposed, the service life of the CO catalyst module is prolonged, and the investment and operation cost is reduced by adopting a transition metal oxide CO catalyst.

The invention belongs to the technical field of electronic components, and discloses an ammonia gas sensor based on layered MoTe2 and TiO2 heterojunction, and a preparation process and application thereof. The ammonia gas sensor comprises a gas sensitive material and an interdigital electrode plate, wherein the surface of the interdigital electrode plate is coated with the gas sensitive material by adopting a dispensing method. The gas sensitive material is a nano composite material formed by molybdenum ditelluride and titanium dioxide. The method is simple in production process and low in cost, and the obtained gas-sensitive material has relatively high sensitivity, selectivity and rapid recovery to ammonia gas at room temperature and a detection lower limit as low as ppb level. According to the present invention, the excellent ammonia gas detection performance at the room temperature is provided so as to hopefully provide good prospects in the application of the new generation portable low-power-consumption room temperature ammonia gas sensor.

The invention discloses a tail gas self-treatment low-emission zero-carbon ammonia hydrogen engine system and a control method, and the tail gas self-treatment low-emission zero-carbon ammonia hydrogen engine system comprises a pure ammonia flameless combustion ammonia decomposition system, a NOx decomposition system, an ammonia hydrogen engine, an air source and an ammonia gas source. The NOx decomposition system utilizes a thermal decomposition technology of nitrogen oxide to realize the reutilization of waste heat of combustion tail gas of the pure ammonia hedging type flameless combustion furnace and decompose the nitrogen oxide in the engine tail gas into nitric oxide, and the ammonia-hydrogen engine utilizes the combustion of the engine to do work, so that the tail gas of the pure ammonia hedging type flameless combustion furnace can be recycled, and the nitrogen oxide in the tail gas of the pure ammonia hedging type flameless combustion furnace can be recycled. Heat utilization of ammonia gas is achieved, and combustion-supporting tail gas needed by the pure ammonia opposite-flushing type flameless combustion furnace is generated.

The invention relates to the technical field of odor emission reduction, in particular to an odor emission reduction control system and method for livestock and poultry manure compositing. According to the system and the method, concentration changes of ammonia gas, hydrogen sulfide and volatile organic compounds and temperature and humidity data in a composting environment are accurately obtained through real-time performance and multi-parameter association of gas monitoring in the composting process; the method comprises the following steps of: calculating a diffusion path, a speed and a coverage area of gas in a compost body through finite element analysis, quantifying the distribution characteristics of gas concentration in space, optimizing the wind speed, the wind quantity and the layout of a ventilation system, and improving the ventilation efficiency. Pattern recognition is performed on compost environment gas emission data through the convolutional neural network, the turning frequency and the compost microenvironment are dynamically adjusted in combination with the gas concentration, a gas emission high-value area and a main guide source are accurately positioned, accurate control over compost fermentation odor emission is achieved, and the systematicness and refinement level of compost odor treatment is improved.

The invention belongs to the technical field of adsorbent preparation, and relates to a preparation method of a series of M-TCBB metal organic framework materials and application of the M-TCBB metal organic framework materials to adsorption of sulfur dioxide and ammonia gas. The preparation method comprises the following steps: dispersing [9, 9 '-dicarbazole]-3, 3', 6, 6 '-tetracarboxylic acid (H4TCBB) serving as an organic ligand and any one or more of yttrium salt, zirconium salt, hafnium salt, cerium salt and thorium salt in a solution according to a certain mass ratio, and carrying out solvothermal reaction at 100-120 DEG C; and after the reaction is finished, centrifuging to take a precipitate, washing and drying to obtain a series of M-TCBB metal organic framework materials. The series of M-TCBB metal organic framework materials prepared by the invention have relatively good adsorption acting force on sulfur dioxide and ammonia gas, and are high in adsorption cycle stability; under a humid condition, capture of sulfur dioxide and ammonia gas shows a humidity enhancement characteristic, namely, water vapor promotes enhancement of the adsorption capacity of sulfur dioxide and ammonia gas.

The invention relates to the technical field of control systems, in particular to an organic fertilizer fermentation intelligent aeration control system applying a nano-molecular film. The system comprises a data acquisition module, a delay analysis module, a gas analysis module and a controller adjusting module. Wherein the delay analysis module is used for determining the response delay of the aeration control system in combination with the change condition of temperature, the regulation hysteresis of the aeration control system and the activeness of microorganisms; the gas analysis module is used for determining the comprehensive gas exchange rate of the fermentation heap according to the humidity change condition, the carbon dioxide concentration and the ammonia gas concentration of the fermentation heap; the controller adjusting module is used for determining a correction coefficient of the aeration control system; and taking the proportional gain corrected by the correction coefficient as the proportional gain of a PID controller in the aeration control system. According to the invention, the response speed and the control precision of the aeration control system are effectively improved.

An aluminum ash pickling device, which relates to the technical field of pickling devices, and comprises a pickling tower (1); and a filtering mechanism comprises a filter screen (8), a rotating shaft (9), a cleaning brush (10) and a rotating disc (11). By means of the filter screen (8), when an induced draft fan (4) drives waste gas to an air intake pipe (2), the waste gas is filtered by the filter screen (8) before entering the pickling tower (1); and under the action of the induced draft fan (4), wind power generated by the waste gas pushes the rotating disc (11) to drive the rotating shaft (9) to rotate, the rotating shaft (9) drives the cleaning brush (10) to rotate, the cleaning brush (10) agitates dust on a surface of the filter screen (8) during rotation, and at this point, the dust is loosened and comes off the surface of the filter screen (8), thus reducing the probability of the filter screen (8) being blocked, and preventing the circulation of the waste gas from being affected. When the wind power is small, the dust falls downward into a collecting box (12), a rotating cover (14) is rotated to release the connection between the rotating cover (14) and an external thread (13), and at this point, the dust accumulated in the collecting box (12) flows downward, such that a worker can collect the dust, thus preventing a small amount of aluminum ash from entering the pickling tower (1) along with the induced draft fan (4) and mixing with an agent which would otherwise impair the treatment efficiency of ammonia gas.

The invention discloses a device for continuously preparing adiponitrile from adipic acid by supergravity, which is characterized in that a specially designed gas-in-liquid mixed feeding mode is firstly adopted, so that liquid of a falling film assembly is uniformly dispersed as far as possible, and meanwhile, by accurately controlling the reaction temperature in the falling film assembly, side reactions are reduced; secondly, the contact mode of gas and liquid of the falling film assembly is changed, the gas-liquid countercurrent contact mode is changed into gas-liquid parallel flow, and the liquid is prevented from being stopped in a pipeline through the gas-liquid parallel flow; and finally, mixing and mass and heat transfer effects of adipic acid and ammonia molecules in the reaction process are enhanced by using a supergravity assembly, so that adipic acid decomposition and coking in a bubbling section of a traditional reactor are effectively slowed down, the reaction efficiency and the product yield are improved, and side reactions are reduced.

The invention relates to the technical field of boiler tail gas treatment, in particular to a boiler tail gas multi-pollutant cooperative control system based on linkage of a PLC and a frequency converter. The system comprises a data acquisition module, a PLC control module and a collaborative optimization module. Concentration data of pollutants in boiler tail gas are collected in real time through the data collection module, the boiler tail gas is introduced into the desulfurization and denitrification tower through the inlet induced draft fan, the PLC control module sets driving rules of the inlet induced draft fan through a logic controller of a PLC, the operation frequency of the inlet induced draft fan is dynamically adjusted according to the content of the pollutants in the boiler tail gas, and the desulfurization and denitrification effect of the boiler tail gas is improved. And the collaborative optimization module returns the tail gas which does not reach the standard to a boiler for secondary desulfurization and denitrification, the tail gas which reaches the standard is introduced into a dust removal tower through an outlet induced draft fan, the electric dust removal voltage is adjusted according to the content of ammonia gas in the tail gas, and linkage control over desulfurization, denitrification and dust removal is achieved by taking the minimum operation cost as the target and adopting a genetic algorithm.

The embodiment of the invention provides a leakage risk assessment method, device and equipment for an ammonia fuel power container ship. The assessment method comprises the following steps: acquiring multi-source parameter data of the ammonia fuel power container ship; inputting the multi-source parameter data into a joint coding layer of an ammonia gas concentration distribution prediction model for feature coding to obtain a coding feature vector; inputting the coding feature vector into a decoding network layer of an ammonia concentration distribution prediction model for vector mapping to obtain a three-dimensional ammonia concentration distribution field vector; and obtaining an ammonia fuel leakage risk assessment result according to the ammonia concentration distribution field vector. According to the embodiment of the invention, the ammonia concentration values at different spatial positions can be intuitively presented through three-dimensional ammonia concentration distribution field vector output, and the quantitative evaluation efficiency and decision reliability of the ammonia fuel leakage risk are remarkably improved.

The invention discloses a system and a method for rapidly and efficiently decomposing ammonia to produce hydrogen through cooperation of plasma catalysis. Ammonia gas enters the normal-pressure arc temperature plasma reactor to form rotating gas flow, is ionized into high-activity plasma under the driving of high-voltage electricity, and is pushed by the rotating gas flow and a gradually-shrinking opening of the reactor to form large-area three-dimensional plasma jet flow, and jet flow gas upwards flows into a coaxial upper-layer catalytic area and downwards flows into a coaxial outer-layer catalytic area due to the limitation of a wall surface; and the reacted gas flows out from a gas guide hole at the lower part. Ammonia gas is firstly activated and pre-decomposed in the arc temperature plasma area and then secondarily decomposed in the coaxial catalytic area, heat of the temperature plasma area directly acts on the catalytic area, and external heating is not needed. The whole structure is that the temperature plasma area and the catalytic area are coaxially integrated, so that the waste heat utilization rate and the reaction energy efficiency are improved. The system is simple and compact in structure, can flexibly supply hydrogen in a distributed manner, is high in energy density, and can be directly driven by wind, light and green electricity.

The invention discloses an efficient ammonia decomposition hydrogen production system based on the Joule heating effect and belongs to the technical field of clean energy. The system is composed of an ammonia supply module, a Joule thermally driven ammonia decomposition reaction module and a hydrogenation module. Wherein the ammonia supply module consists of a liquid ammonia storage device, a vaporizing chamber and an ammonia gas storage device; the Joule thermally-driven ammonia decomposition reaction module consists of an ammonia gas flow control valve, a reaction tube gas inlet, a reaction tube gas outlet, a Joule heating electrode tip, a direct-current power supply, a temperature sensor, a thermal insulation layer, a reaction tube, a catalyst and a stainless steel alligator clip; the hydrogenation module is composed of a hydrogen purifying and drying device, a hydrogen compressor, a hydrogen cooling unit, a high-pressure hydrogen storage tank, a hydrogen flow control valve and a hydrogenation machine. The whole process can be started and stably output within one second, the conversion rate and the electrothermal conversion efficiency both exceed 90%, low energy consumption, quick response and safe operation are achieved, the system is particularly suitable for hydrogen refueling station construction in a future hydrogen energy network, and green hydrogen energy economy development is promoted.

The invention relates to a method for preparing a low-temperature silicon nitride film, which adopts a hot filament chemical vapor deposition technology and comprises the following steps of: placing a substrate on a support plate and feeding the support plate into a vacuum reaction chamber; introducing required process gas into the vacuum reaction chamber, wherein the process gas comprises any one or both of ammonia gas and nitrogen gas, hydrogen gas and silane; and dynamically adjusting the temperature of the hot filament, and depositing on the substrate to obtain the required silicon nitride film. In addition, the invention also relates to equipment for preparing the low-temperature silicon nitride film by adopting the method for preparing the low-temperature silicon nitride film. The hot filament chemical vapor deposition technology is adopted, the compact silicon nitride thin film can be prepared when the temperature of the substrate is higher than the room temperature, the application field of equipment is greatly widened, the silicon nitride thin film deposited under the condition that the temperature of the substrate is kept low can be produced under the proper air pressure, and the production efficiency is improved. And manufacturing of HBC cells and perovskite cells in the photovoltaic field is facilitated.

The invention discloses a precise ammonia spraying system suitable for SNCR denitration, and relates to the technical field of ammonia spraying devices for SNCR denitration, the precise ammonia spraying system comprises a top cover fixedly mounted at the top of a boiler cyclone separator barrel, and a reciprocating pushing mechanism is mounted on the outer wall, located on the outer side of a spray gun, of the boiler cyclone separator barrel; and supporting cylinders which are distributed at equal intervals are fixed on the inner wall, close to the spray gun, of the boiler cyclone separator cylinder body. According to the precise ammonia spraying system suitable for SNCR denitration, the sleeve used for dispersing ammonia sprayed by the spray gun can rapidly rotate and transversely move, dead angles in the spraying process can be reduced, the ammonia is evenly distributed in the boiler cyclone separator barrel, mixing of the ammonia and flue gas is promoted, the working efficiency of the ammonia spraying system is improved, and the service life of the ammonia spraying system is prolonged. Moreover, the sleeve can generate slight vibration during rotation, dust particles in the through holes are vibrated off, the service life of the sleeve is prolonged, meanwhile, gas can be helped to form finer fog drops during spraying, ammonia gas can be better diffused conveniently, and the flue gas reaction efficiency is improved.

The invention discloses a livestock and poultry health state intelligent evaluation method based on multi-sensor fusion and an AI prediction model, and belongs to the technical field of livestock breeding, and the method comprises the following steps: setting multiple types of sensors in a livestock and poultry breeding area, collecting multi-source data such as temperature, humidity, carbon dioxide concentration, ammonia gas concentration, illumination intensity, weight and current, and carrying out the analysis of the data; wherein the weight data is obtained through the weighing platform, and the current data is used for sensing the operation state of drinking, ingestion, ventilation or lighting equipment; various types of sensors such as temperature and humidity sensors, carbon dioxide sensors, ammonia gas sensors, illumination sensors, weight sensors and current sensors are deployed in livestock and poultry breeding areas, all-directional data acquisition of environments and behavior states is realized, and dynamic modeling and feature extraction of key behavior nodes are realized by introducing a deep neural network structure of a gating circulation unit and an attention mechanism.

The invention relates to the field of nitriding furnaces, in particular to an ammonia gas circulating system of a nitriding furnace, which comprises a furnace body, a furnace cover and a gas inlet mechanism, the furnace body is provided with a containing cavity, the furnace cover is connected to the furnace body and covers a cavity opening of the containing cavity, and the gas inlet mechanism comprises a gas inlet main pipe, an annular pipeline, an electromagnetic valve and a detection assembly, one end of the gas inlet main pipe is connected to the outer wall of the annular pipeline, the other end of the gas inlet main pipe is used for being connected with an external ammonia gas storage mechanism, the electromagnetic valves are connected to the annular pipeline, the other ends of the electromagnetic valves extend into the furnace body, the electromagnetic valves are circumferentially distributed around the axis of the annular pipeline at intervals, and the detection assembly is embedded in the containing cavity to control the electromagnetic valves to be opened and closed. External ammonia gas is conveyed to the annular pipeline through the gas inlet main pipe, then the ammonia gas is input into the furnace body through the multiple electromagnetic valves distributed around the axis of the annular pipeline in the circumferential direction at intervals, meanwhile, the detection assembly controls the electromagnetic valves to be opened and closed through the pressure intensity in the containing cavity, the ammonia gas introduced into the nitriding furnace is evenly distributed to all positions in the nitriding furnace, and the uniform nitriding effect is improved.

The invention relates to the technical field of chemical engineering, in particular to a simple and safe ammonia residual gas recovery system which comprises a liquid ammonia storage tank (1), an accident ammonia absorption tower (2), a circulating pump set, a gas phase pipeline and a liquid phase pipeline, the circulating pump set comprises a circulating water pump, a compression pump and a waste heat recovery pump, the waste heat recovery pump is connected with a steam valve, and the liquid ammonia storage tank (1) is connected with a gasifier (11). The vaporizer (11) is connected with the buffer tank (12), the buffer tank (12) and the accident ammonia absorption tower (2) circulate pure ammonia gas through a gas phase pipeline, the accident ammonia absorption tower (2) and the liquid ammonia storage tank (1) circulate pure liquid ammonia through a liquid phase pipeline, the absorption tank (21) adsorbs exhaust gas detected by the accident ammonia absorption tower (2), and recovered nitrogen is used for purging the liquid ammonia storage tank (1), so that escape-free environment-friendly treatment and recycling of ammonia are realized.

The present invention provides an ammonia removal system for a urea granulation tower, which includes a hydrogen chloride gas spray head for spraying hydrogen chloride gas below the dust removal cloth bag of the urea granulation tower. During operation, on the one hand, the hydrogen chloride gas can act as a reactant to react with ammonia mixed in the air to form ammonium chloride, and the formed ammonium chloride is intercepted by the dust removal cloth bag, thereby achieving the purpose of ammonia removal; on the other hand, the hydrogen chloride gas can act as a catalyst to cause the tiny urea particles carried in the air to react with the moisture in the air under its catalytic action to form carbon dioxide and ammonia, thereby reducing the air humidity and solving the problem of the dust removal cloth bag being blocked. This ammonia removal system can not only achieve the purpose of ammonia removal, but also reduce the air humidity to solve the problem of the dust removal cloth bag being blocked, so it can be used in combination with the dust removal cloth bag.

The invention relates to the technical field of pendimethalin wastewater treatment, in particular to a pendimethalin wastewater treatment method which comprises the following steps: step 1, adding ferrous oxide or ferrous hydroxide into wastewater, and adjusting the pH value of the wastewater to be neutral; 2, adjusting the pH value of the primary filtrate to 2-5 by using an inorganic acid, and adding an iron-carbon mixture with the mass ratio of 1: (0.5-2) to carry out an oxidation-reduction reaction; and step 3, introducing the secondary filtrate into 2-5 reaction kettles which are connected in series, and adding hydrogen peroxide for 1-3 times according to the mass ratio of hydrogen peroxide to COD (Chemical Oxygen Demand) of (15-25): 1. According to the pendimethalin wastewater treatment method provided by the invention, the iron-carbon mixture generates a primary battery effect in the solution, nitrate radicals can be quickly reduced into nitrogen oxides or ammonia gas, the nitrate radicals are efficiently and quickly treated, and meanwhile, iron ions and ferrous ions can finally generate corresponding hydroxides to be separated out.

The invention belongs to the technical field of gas sensor materials, and particularly relates to a novel high-conductivity conjugated coordination polymer gas-sensitive material, an ammonia gas sensor and a preparation method. Copper salt and 1, 5-diamino-4, 8-dihydroxy anthraquinone or 1-amino-4-hydroxy anthraquinone are used as raw materials, two novel high-conductivity conjugated coordination polymer materials are prepared by adopting a simple solvothermal method, and the preparation method is simple in process and can be used for mass production of materials. The obtained material can form a film on planar electrodes at two ends to prepare a resistance-type ammonia gas sensor, so that ammonia gas can be detected in a concentration range of 2.3 ppb-100 ppm, and the defects of narrow detection range and insufficient sensitivity of a single material in the prior art are overcome.

The invention relates to the technical field of ship engine tail gas treatment, and discloses a denitration system and a denitration method for ammonia fuel engine tail gas. The denitration system comprises an ammonia fuel engine and a denitration device, the liquid ammonia fuel supply device is connected with the ammonia fuel engine through a supply pipeline and is used for supplying ammonia fuel to the ammonia fuel engine; a gas inlet of the ammonia gas buffer tank is connected with the supply pipeline, and the ammonia gas buffer tank is used for collecting unburned ammonia gas generated in the supply pipeline; the ammonia water preparation device is connected with a gas outlet of the ammonia gas buffer tank; and the tail gas denitration device is connected with an outlet of the ammonia water preparation device and an exhaust port of the ammonia fuel engine. The ammonia water is prepared from the unburned ammonia gas, and the prepared ammonia water is used for subsequent reduction of nitrogen oxides in tail gas of an ammonia fuel engine, so that the treatment problem of the unburned ammonia gas can be solved, and meanwhile, the consumption of a reducing agent is reduced. In addition, the ammonia water can replace part of the reducing agent, so that the storage amount of the reducing agent can be reduced, and the ship space occupied by the reducing agent is reduced.

The invention discloses a La2O3-ZnO-NiO / ZrO2 oxygen carrier as well as a preparation method and application thereof, and belongs to the technical field of ammonia decomposition. According to the technical scheme, the method comprises the following steps: 1) synthesis of a ZrO2 carrier: adding NH3.H2O into a zirconyl nitrate solution to induce precipitation; 2) preparation of La2O3 / ZrO2: adding lanthanum nitrate hexahydrate and urea to obtain a precipitate, drying the precipitate, and finally calcining the precipitate; 3) preparation of La2O3-ZnO / ZrO2: adding zinc nitrate hexahydrate and urea, standing to obtain a precipitate, drying and calcining; and 4) preparation of La2O3-ZnO-NiO / ZrO2: adding NH3.H2O, then adding nickel acetate and thiourea, reacting, drying, and calcining twice to obtain the target product. Lattice oxygen in the oxygen carrier is used for catalytic oxidation of ammonia decomposition, the oxygen carrier can be recycled for multiple times, and the method is suitable for industrial application in the future.

The invention relates to the technical field of pure ammonia combustors, in particular to a catalytic auxiliary cracking plasma pure ammonia combustor and an operation method thereof. According to the technical scheme, the device comprises catalytic cracking areas, a purification area, a pre-combustion area, a main combustion area, an ammonia supply area and a waste heat system, the catalytic cracking areas are arranged on the two sides of a combustor and comprise an ammonia gas inlet channel and a catalytic reaction area internally provided with a porous medium, and a catalyst fixedly grows on the surface of the porous medium; the purification area is located outside the combustor and connected with an outlet of the catalytic cracking area through a pipeline, and selective separation membranes are arranged at the outlet end and the exhaust end of the purification area respectively; the pre-combustion areas are distributed on the two sides of the main combustion area, comprise air inlet channels and plasma igniters and communicate with an outlet of the purification area. According to the invention, the problems of ignition, stable combustion and low NOx emission of the ammonia fuel are solved, the unification of efficient energy utilization and industrial applicability is realized, and a key technical support is provided for large-scale application of the ammonia alternative fuel in an industrial kiln.

The invention discloses application of sodium tetraphenylborate in carbon sourcing of landfill leachate and a carbon sourcing method and device. According to the invention, sodium tetraphenylborate is used as an ammonia nitrogen removing agent and is added into the percolate sewage of the organic garbage, so that the carbon nitrogen ratio of supernatant liquid is increased, and then the supernatant liquid is used as a carbon source. The basic principle that sodium tetraphenylborate is subjected to a precipitation reaction with ammonia ions in an aqueous solution is utilized, then standing separation is selected according to precipitation properties, and discharged water can be stored as a carbon source or directly added into a water treatment process in the form of the carbon source. The precipitate is collected and dehydrated, the precipitate can be recycled as a precipitant after being heated and recovered by alkali liquor, and the released concentrated ammonia gas is collected and can be used for industrial production. The method has the advantages of high reaction efficiency, low interference degree, high controllability of carbon-nitrogen ratio, recyclable main reagents, low theoretical operation cost, obvious removal effect on chroma of sewage, and high industrial value of discharged carbon-sourced water.

The utility model discloses a hydrogen ammonia coupling low nitrogen burner relates to burner technical field, including first tank and second tank, be equipped with connecting subassembly between the first tank and the second tank, first tank far away from the one end of second tank is fixedly connected with the gas outlet pipe, the gas outlet pipe is communicated with first tank, and the gas outlet pipe is connected with the gas outlet pipe. A combustion assembly is arranged at one end of the gas outlet pipe away from the first tank; through the arrangement of the ammonia gas inlet pipe and the pipe connector, hydrogen and ammonia gas in a specific proportion can be injected into the cavity formed by the first tank body and the second tank body during working, the hydrogen and the ammonia gas are mixed through the premixing assembly and then sprayed out of the nozzle, the combustion temperature can be effectively reduced through the addition of the ammonia gas, NOx generation is reduced, meanwhile, the combustion speed of the ammonia gas is low, and the combustion efficiency is improved. And after the ammonia gas is mixed, the overall combustion speed can be reduced, the combustion stability is improved, so that the combustor has good combustion stability, and meanwhile, the emission of NOx is greatly reduced.

The invention relates to a tail gas denitration system and method for an ammonia fuel ship, an ammonia supply pipeline of an ammonia fuel engine in the system adopts a double-wall pipe, the inner pipe of the double-wall pipe is used for conveying liquid ammonia, and the outer pipe of the double-wall pipe is connected with an ammonia treatment system through a fan so as to suck leaked ammonia gas to the ammonia treatment system; the ammonia treatment system is connected with the buffer tank through a fan and is used for conveying the discharged gas to the buffer tank after pressurizing the discharged gas through the fan; the ammonia treatment system is connected with a reducing agent tank through a pump; the reducing agent tank receives ammonia water of the ammonia treatment system through the pump; the SCR reducing agent supply system is connected with the reducing agent spray gun through the reducing agent tank and the buffer tank and used for conveying the discharged gas to the reducing agent spray gun through the SCR reducing agent supply system to assist in atomizing ammonia water. According to the ammonia fuel ship tail gas denitration system and method, ammonia water generated in the ammonia treatment system is used as a reducing agent of the SCR system, and discharged gas of the ammonia treatment system is used as auxiliary atomization gas of the reducing agent, so that waste is recycled, and the denitration efficiency is improved.

The invention discloses a dual-fuel engine combustion control method based on hydrogen-ammonia energy ratio and gas distribution overlap angle regulation and control, which comprises the following steps: 1) fuel ratio control: acquiring current operation state parameters of an engine, determining a target AER according to preset mapping, regulating ammonia gas supply quantity and hydrogen supply quantity to enable the actual AER to reach the target AER, and controlling the fuel ratio; the AER is adaptively set according to engine load and combustion stability conditions; 2) valve timing control: adjusting the opening time of an intake valve or the closing time of an exhaust valve through a variable valve timing mechanism so as to change a valve timing overlap angle VOA, wherein the VOA is set to be a negative value, a small overlap angle or a positive overlap angle according to the working condition of an engine; (3) injection time sequence optimization is conducted, specifically, the injection time of ammonia gas and the in-cylinder direct injection time of hydrogen are controlled respectively, and coordinated optimization of a fuel injection strategy and valve timing is achieved; and 4) closed-loop steady-state control: monitoring a combustion state and an emission index in real time, comparing the combustion state and the emission index with a threshold value to serve as a feedback signal, and correcting the target AER and VOA settings in time. According to the dual-fuel engine combustion control method based on regulation and control of the hydrogen-ammonia energy ratio and the gas distribution overlapping angle, the energy ratio of hydrogen fuel and ammonia fuel and the overlapping opening angle of an intake valve and an exhaust valve are dynamically adjusted under different working conditions, so that the combustion reaction rate and temperature are coordinated, and the stable and efficient combustion process is achieved; and harmful emissions of NOx, unburned ammonia and the like are obviously reduced.

The invention provides an ammonia flash steam reliquefaction system for realizing cold energy supply, the reliquefaction system comprises an ammonia fuel cabin, an ammonia gas storage tank, a compressor, a condenser pipe, a cooling tank and other devices which are connected in sequence, ammonia gas flowing out of the ammonia fuel cabin is converted into high-pressure liquid ammonia after being compressed and condensed, and the high-pressure liquid ammonia is divided into three branches after flowing out through a cold heat exchanger, the first branch flows into the cooling tank after being depressurized and cooled by the high-pressure throttle valve, so that the interior of the cooling tank is cooled; the second branch is depressurized and cooled by a refrigeration storage throttle valve and then enters a liquid ammonia evaporator in the refrigeration storage, so that the refrigeration storage is cooled; and the third branch flows back to the ammonia fuel cabin after being depressurized and cooled by a back-to-cabin throttle valve. And meanwhile, the liquid ammonia in the cooling tank is also used for cooling the refrigerant water, so that the refrigeration of a user room is realized. According to the reliquefaction system, cold energy contained in high-pressure liquid ammonia in the reliquefaction process is fully utilized, different refrigeration schemes are made according to the refrigeration house and the user room, and the whole pipeline design is more reasonable.

The invention relates to a supergravity adiponitrile production system and method, the system comprises a supergravity nitrile reactor, a separation tower, a semi-nitrile evaporator and a refining device, the middle part of the supergravity nitrile reactor is communicated with the lower part of the separation tower through a main pipeline, and the top of the supergravity nitrile reactor is communicated with a main ammonia gas pipeline; the top of the separation tower is respectively communicated with an ammonia recovery pipeline and a water recovery pipeline, and the upper part of the separation tower is communicated with the refining device through a pipeline; and the top of the semi-nitrile evaporator is respectively communicated with the bottom of the separation tower, the main pipeline and the main ammonia gas pipeline through pipelines. The reactor has the beneficial effects that the characteristics of structure, technology and the like of the supergravity reactor are utilized, the reverse concentration gradient of ammonia gas and molten adipic acid is formed in the radial direction of the rotor from inside to outside, the gas-liquid contact specific area is increased, the mass transfer driving force is increased, the reaction rate is increased, reaction products are separated out in the reaction process, and the reaction is accelerated and pushed.

The utility model discloses an industrial flue gas denitration treatment zero-emission device, which relates to the technical field of industrial flue gas urea hydrolysis denitration water treatment, and comprises a hydrolyzer, the hydrolyzer is provided with a liquid inlet pipeline, a sewage discharge pipeline, a pressurization pipeline, a pressure relief pipeline and an ammonia conveying pipeline, the inner wall of the hydrolyzer is fixedly provided with a tube bundle, an inlet of the tube bundle is connected with a steam valve, and the steam valve is connected with a water outlet of the tube bundle. The tube bundle outlet is connected with a drain valve; according to the application, through the arrangement of the pressurization pipeline, the sewage discharge pipeline, the pressure relief pipeline and the dilution water pipeline, unreacted urea solution wastewater in the hydrolyzer is ensured to be pumped into the urea solution storage tank through pressurization, so that cyclic utilization is realized; when overpressure occurs, the ammonia gas mixer in the hydrolyzer can be transferred into the urea solution storage tank, and dilution water is used for dilution and spraying, so that the ammonia gas mixed waste gas can be effectively blended into the urea solution storage tank, the recycling of waste water and waste gas is realized, and the goal of zero emission is achieved. Compared with a traditional process, the device is simpler in structure and higher in practicability.