813 results about "Liquid ammonia" patented technology

The invention relates to the technical field of industrial process control, and discloses a denitration intelligent monitoring method and system based on data analysis and a storage medium. The method comprises the following steps: performing working condition identification by using an improved K-means algorithm to obtain stable operation, fire change preparation, fire change proceeding and fire change recovery modes; matching a segmented control strategy according to an identification result, and carrying out weighted fusion on feedforward and predictive control in a fire exchange preparation stage to generate a differentiated liquid ammonia regulation instruction; the disturbance feed-forward compensation amount is calculated in combination with the combustion state of the kiln, the adjusting instruction is restrained, and a liquid ammonia control instruction is obtained; the execution effect is monitored in real time through standardized deviation detection, manual intervention is switched in case of abnormity, and control parameters are fed back and updated in case of normal. The problems that NOx control lags behind and liquid ammonia consumption is not economical under the fire exchange working condition are solved, and the control precision and the self-adaptive capacity of the denitration system are improved.

A method for continuously producing m-xylylenediamine belongs to the technical field of organic synthesis and comprises the following steps: (1) mixing isophthalonitrile, toluene and liquid ammonia according to a mass ratio of 1: (3-5): (13-17) in a nitrogen atmosphere to form a reaction mixture; (2) heating the interior of a reaction bed containing a catalyst to 90-95 DEG C, continuously introducing hydrogen into the reaction bed, introducing the reaction mixture after the pressure intensity of the reaction bed is stable, and carrying out a catalytic hydrogenation reaction to generate a reaction product; and (3) carrying out gas-liquid separation on the reaction product, removing liquid ammonia from the liquid-phase product through an ammonia distillation process, and separating toluene and m-xylylenediamine through a rectification process to obtain m-xylylenediamine. According to the method, isophthalonitrile and hydrogen are used as raw materials, liquid ammonia and methylbenzene are used as reaction solvents, the raw materials and the reaction solvents are heated to 90-95 DEG C under the catalytic action of a catalyst for an exothermic reaction, m-xylylenediamine is generated through the reaction, and the reaction yield is larger than 99%.

The invention discloses a metal element doped MnO2 and MnFe oxide composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gas desulfurization and denitrification. The preparation method comprises the following steps: dissolving potassium permanganate, divalent manganese salt and doped metal salt in water for reaction to prepare metal element doped MnO2; and mixing and reacting with a template agent, ferric salt and sodium salt, drying and roasting to obtain the final catalyst. The MnO2 electronic structure is modulated by doping metal elements, and the three-dimensional porous structure of the MnFe oxide is constructed by using the template agent, so that the catalyst has efficient adsorption and strong catalytic oxidation capacity, NO and SO2 can be synergistically removed at the same time, and the catalyst has desulfurization and denitrification activity in a wide temperature range of 30-300 DEG C, and is suitable for industrial production. And liquid ammonia does not need to be used in the purification process, so that the purification agent is high in safety and is particularly suitable for purification treatment under complex flue gas conditions in the non-electric industry.

The invention relates to an all-cotton four-way stretch fabric and a preparation method thereof, and belongs to the technical field of textile dyeing and finishing. The preparation method comprises the following steps: performing singeing, enzyme desizing, liquid ammonia finishing, loose alkali shrinkage and overfeeding soft heat setting on gray fabric to obtain the all-cotton four-way stretch fabric. The warp-wise and weft-wise shrinkage rates of the prepared four-way stretch fabric are-3.0%-0%, the warp-wise elastic elongation rate is 12%-15%, the weft-wise elastic elongation rate is 12%-18%, and the elastic residual elongation rate is smaller than or equal to 8%; obvious warp and weft elasticity can be achieved without elastic fibers, the problems that elastic fabrics such as spandex core-spun yarn fabrics are complex to manufacture, unstable in fabric size and the like are solved, the warp and weft elasticity is obvious, the size stability is good, the hand feeling is soft, and the price is low; the preparation method is simple, does not need equipment transformation, is easy to operate and does not damage fiber strength.

The invention relates to the technical field of ceramic materials, and discloses a nitrogen-rich Si-Zr-N precursor, a nitrogen-rich amorphous SiZrN ceramic preparation method and a nitrogen-rich Si-Zr-N. The preparation method comprises the following steps: mixing perhydropolysilazane and tetrakis (dicarboxamide) zirconium, and then carrying out low-temperature liquid ammonia crosslinking and room-temperature ammonification to obtain the nitrogen-rich Si-Zr-N precursor. According to the preparation method of the nitrogen-rich amorphous SiZrN ceramic, high-temperature ammonolysis is carried out on a nitrogen-rich Si-Zr-N precursor, and the nitrogen-rich amorphous SiZrN ceramic is obtained. According to the invention, the nitrogen content of the precursor is increased through the molecular-level structure design, so that the formation of the high-nitrogen-ratio amorphous ceramic is facilitated; the pyrolysis path can be regulated and controlled, the product structure is compact, the components are uniform, and the problem of uneven mixing or incomplete reaction in the traditional method is avoided; the precursor is high in universality, is suitable for various processing and pyrolysis modes, and has good application expansibility; the cost is controllable and the method is environment-friendly.

The invention discloses a vehicle-mounted ammonia hydrogen production system, belongs to the technical field of vehicle-mounted ammonia hydrogen production, and solves the technical problems that the existing vehicle-mounted ammonia hydrogen production method cannot fully recycle high-pressure ammonia energy and cannot use air energy. The system comprises a liquid ammonia tank, an ammonia hydrogen production heat exchange catalytic reactor, an engine and a controller, the liquid ammonia tank is connected with the ammonia hydrogen production heat exchange catalytic reactor through an ammonia gas pipe, the engine is connected with the ammonia hydrogen production heat exchange catalytic reactor through an exhaust pipe, and the ammonia gas pipe is sequentially provided with a control valve, a first heat exchanger, a turbine generator, a large-area heat exchanger and a second heat exchanger. The turbine generator is electrically connected with the vehicle-mounted storage battery, the large-area heat exchanger is connected with a variable-frequency air blower through an air pipe, the engine is connected with the first heat exchanger through a cooling water pipe, and the ammonia hydrogen production heat exchange catalytic reactor is connected with the second heat exchanger through a nitrogen hydrogen pipe. High-pressure ammonia gas energy and air energy can be fully recycled and used through the turbine generator and the large-area heat exchanger.

The utility model discloses a gas turbine system based on ammonia catalytic cracking. The gas turbine system comprises a liquid ammonia assembly, a cracking assembly, a liquid ammonia combustion assembly, a heat exchange component and a gas turbine, the cracking assembly is used for pressurizing and cracking part of liquid ammonia provided by the liquid ammonia assembly to generate cracking gas; the liquid ammonia combustion assembly comprises a gasification part and a combustion part which are connected with the liquid ammonia assembly, the gasification part is used for gasifying the other part of liquid ammonia provided by the liquid ammonia assembly, and the combustion part is used for combusting ammonia gas generated by the gasification part so as to provide required heat for the cracking assembly; the heat exchange part and the gas turbine are sequentially connected with the cracking assembly, the heat exchange part is used for cooling cracking gas, and the cooled cracking gas is conveyed into the gas turbine for combustion; smoke exhausted by the combustion component and the gas turbine provides heat needed by the gasification component. Pyrolysis gas generated by pure ammonia catalytic cracking can be used as fuel, the combustion effect is improved, and the energy utilization efficiency is improved.

The invention relates to the technical field of engines, and provides a liquid ammonia engine mechanism and a control method and system. The liquid ammonia engine structure comprises a liquid ammonia supply structure which is communicated with the inlet end of a high-pressure ammonia rail through a pipeline; the high-pressure ammonia rail is connected with the cooling structure, and liquid ammonia in the high-pressure ammonia rail exchanges heat with cooling liquid of the cooling structure for cooling; a liquid ammonia temperature sensor is also arranged on the high-pressure ammonia rail; the outlet end of the high-pressure ammonia rail is communicated with the high-pressure liquid ammonia nozzle through a pipeline; the high-pressure liquid ammonia nozzle atomizes high-pressure liquid ammonia into tiny liquid drops and then sprays the tiny liquid drops into the combustion chamber; a cylinder pressure sensor is arranged at the top of the combustion chamber; an oxygen sensor is arranged on the exhaust pipeline; the system further comprises an ECU module. The ECU module carries out dynamic decision making through a preset sub-working-condition control strategy on the basis of the operation working condition of an engine and obtained monitoring data. The problem that the actual injection amount is reduced due to the liquid-gas entrainment phenomenon in the liquid ammonia conveying process is solved.

This invention discloses a deep peak-shaving system and method for thermal power plants based on ammonia cracking hydrogen production coupled with deep utilization of waste heat. It relates to the field of thermal power generation and includes a gasifier, an ammonia cracking hydrogen production unit, a cooler, a separator, an ammonia storage tank, an ammonia-hydrogen storage system, a peak-shaving burner, and a boiler. This invention utilizes the waste heat of the thermal power boiler to vaporize liquid ammonia into gaseous ammonia. The ammonia cracking hydrogen production unit uses medium- and high-temperature waste heat or electrical energy, along with an ammonia cracking catalyst, to crack a portion of the ammonia gas, producing an ammonia-hydrogen-nitrogen mixture. This mixture is then separated by a separator to obtain an ammonia-hydrogen mixture. The ammonia-hydrogen mixture is mixed with ammonia gas to produce mixtures with different ammonia-hydrogen ratios, which are stored in the ammonia-hydrogen storage tanks. The ammonia-hydrogen ratio used in the burner is adjusted according to different loads to maintain stable combustion. This invention can maintain stable combustion in the burner under low loads, achieving deep peak-shaving of thermal power plants, and can also deeply utilize waste heat from thermal power plants, improving power generation efficiency.

The invention belongs to a urea synthesis system using liquid carbon dioxide and a urea synthesis method. Comprising a urea synthesis tower, the urea synthesis tower is respectively connected with a liquid ammonia pipeline and a carbon dioxide gas pipeline, the carbon dioxide gas pipeline is connected with an outlet of a liquid-phase carbon dioxide delivery pump through a liquid-phase carbon dioxide vaporization unit, and an inlet of the liquid-phase carbon dioxide delivery pump is connected with a liquid-phase carbon dioxide delivery pipeline; liquid carbon dioxide is directly used as a raw material, a liquid-phase carbon dioxide delivery pump is used for pressurization, and gasification is carried out after pressurization, so that the liquid carbon dioxide meets the requirements of a urea synthesis tower, and the characteristics of saving urea synthesis energy consumption, reducing the use amount of circulating water and reducing the occupied area of equipment are achieved.

This invention discloses a flexible ammonia synthesis process. The feed gas, after preheating, enters a temperature-controlled ammonia synthesis tower, where it reacts under the action of a catalyst. After the reaction, the gas recovers heat energy through an outlet waste boiler, undergoes multi-stage cooling, and then enters an ammonia separator. Liquid ammonia is obtained at the bottom, while the non-condensable gas at the top is pressurized by a circulating compressor and returned to the inlet of the temperature-controlled ammonia synthesis tower. In the tower, the feed gas enters through the feed gas inlet and passes radially from the outside in through a distribution plate, catalyst bed section I, another distribution plate, and catalyst bed section II, undergoing heat exchange and reaction simultaneously. The reacting gases converge at the center and are then exited through the reaction gas outlet at the bottom. This invention features a simple process, easy control, low equipment investment and operating costs, energy saving and consumption reduction, high reaction efficiency, relaxed reaction conditions, and the bed is less prone to overheating or temperature loss under high loads. The system can maintain stable operation even with fluctuations in feed gas flow rate of 0–120%.

The low-NOX-emission hydrogen-ammonia fusion micro gas turbine comprises a combustion chamber, a plurality of secondary air inlet holes are formed in the wall face of the combustion chamber, and the secondary air inlet holes are used for feeding part of compressed air and a first path of liquid ammonia fuel into the combustion chamber; a cracking chamber with a cracked gas outlet is arranged in the combustion chamber and located at one end close to the turbine, a catalyst is arranged in the cracking chamber, a second path of liquid ammonia fuel is fed into the cracking chamber, the second path of liquid ammonia fuel is cracked under the action of heat energy of the combustion chamber and the catalyst, and the second path of liquid ammonia fuel is fed into the cracking chamber. And obtained cracked gas enters the combustion chamber through the cracked gas outlet to be combusted. High-temperature flue gas generated by the combustion chamber is used as a heat source, ammonia is catalytically cracked in the combustion chamber of the gas turbine to generate hydrogen-rich mixed gas, the hydrogen-rich mixed gas is introduced into the combustion chamber to serve as a combustion improver, ammonia combustion flame is stabilized, NOX emission is reduced, and meanwhile stepped utilization of energy is achieved.

A toxic ammonia gas absorption system for a liquid ammonia fuel ship, comprising a toxic ammonia gas release source (100), an ammonia gas absorption tank (200), an ammonia gas guide pipe, and a diluted ammonia gas discharge pipe. The ammonia gas absorption tank (200) is provided with an absorbent (201), a gas diffusion layer (202), a liquid level switch (203), a gas phase space (206) and a temperature control device (207). The present system can improve the safety, environmental friendliness and economy of ships using ammonia fuel.

The invention relates to the technical field of chemical engineering, in particular to a food-grade ammonia water production system and method. The food-grade ammonia water production system comprises a liquid ammonia tank, a first heat exchanger, a first buffer device, an absorption tower and a second heat exchanger which are connected in sequence; the first heat exchanger is used for heating liquid ammonia to form ammonia gas; the second heat exchanger is used for cooling the ammonia water; an ammonia gas pipeline is arranged between the first buffer device and the absorption tower, and a pressure sensor is arranged on the ammonia gas pipeline; a second buffer device is arranged between the pressure sensor and the ammonia gas pipeline; the first buffer device internally comprises an air inlet pipe, a plurality of distribution pipes arranged in parallel and an exhaust pipe which are connected in sequence; the pipe diameter of the distribution pipe is smaller than that of the gas inlet pipe or the gas outlet pipe. The food-grade ammonia water production system provided by the invention can reduce the fluctuation amplitude of pipeline pressure caused by the process of forming ammonia gas from liquid ammonia, improves the production stability, and enables the detected pipeline pressure value to have a higher reference value.

The solvated metal particle-coating system includes a metal additive and a polar outer-sphere electron transferring solvent. The metal additive is solvated in the polar outer-sphere electron transferring solvent. The polar outer-sphere electron transferring solvent may include liquid ammonia, methylamine, and / or hexamethylphosphoramide. The metal additive may include an alkali metal and / or an alkaline earth metal. The solvated metal additive within the polar outer-sphere electron transferring solvent may be used to coat a metal particle and / or a metalloid particle as a layer. As the polar outer-sphere electron transferring solvent evaporates, the solvated metal additive is coupled to the metal particle and / or the metalloid particle.

A marine liquid ammonia fuel supply system capable of cooling a diesel nozzle utilizes a liquid ammonia supply system matched with a dual-fuel main engine and cold energy of low-temperature liquid ammonia fuel, a cylinder in the dual-fuel main engine is provided with an ammonia fuel nozzle and the diesel nozzle, and a heat exchange coil is wound outside the diesel nozzle. Liquid ammonia is injected into a cylinder through an ammonia fuel nozzle to combust and do work, after an ammonia fuel mode of the dual-fuel main engine is finished, nitrogen is utilized to purge a fuel supply pipeline and the interior of the dual-fuel main engine, a gas-liquid mixture is purged to an ammonia gas treatment unit through a backflow double-wall pipe to be subjected to gas-liquid separation, separated liquid ammonia returns to a buffer tank, and the ammonia fuel mode of the dual-fuel main engine is finished. And the separated gas is guided into the ammonia gas absorption device through the receiving tank. The cooling function of the main engine on the nozzle in the diesel oil mode can be achieved, and compared with a traditional technical scheme that a fresh water cooling system is independently arranged, the cooling system has the advantages of being low in cost, small in extra occupied space, simple in system configuration, good in cooling effect, capable of saving energy, reliable in operation and the like.

The application discloses an ammonia dual-fuel ship air conditioning refrigeration system and method and a ship, and relates to the field of ship air conditioning refrigeration systems. The system comprises an air conditioning cold water unit system, a liquid ammonia cold energy recovery heat exchanger system, an air conditioning refrigerant water expansion tank and an air conditioner. The air conditioning cold water unit system, the liquid ammonia cold energy recovery heat exchanger system, the air conditioning refrigerant water expansion tank and the air conditioner are connected through circulating pipelines and corresponding valves. The air conditioning cold water unit system and the liquid ammonia cold energy recovery heat exchanger system are arranged in an ammonia fuel supply equipment room, and the air conditioning refrigerant water expansion tank and the air conditioner are arranged inside a driver's cabin. An air conditioning refrigerant water circulating pump is arranged on the circulating pipeline in the ammonia fuel supply equipment room. The application recovers and utilizes the cold energy of low-temperature stored ammonia fuel, solves the problem that a ship is difficult to maintain and replace refrigerant in the European Union region, saves electric energy of a dual-fuel ship, and plays a role in energy saving and emission reduction.

The invention discloses an ammonia water solution preparation system capable of efficiently dissolving gas and a process thereof. The system comprises a liquid ammonia bottle, an ammonia water solution buffer tank, an escape ammonia water absorption tank, an ammonia water solution tank and an ammonia gas absorber which are sequentially communicated through a connecting pipeline, gas inlets of the connecting pipelines are formed in the tops of the liquid ammonia bottle, the ammonia water solution buffer tank, the escape ammonia water absorption tank or the ammonia water solution tank, and gas outlets of the connecting pipelines are formed in the bottoms of the ammonia water solution buffer tank, the escape ammonia water absorption tank, the ammonia water solution tank or the ammonia gas absorber; the tops of the ammonia water solution buffer tank, the escaped ammonia water absorption tank, the ammonia water solution tank and the ammonia gas absorber are communicated to a demineralized water pipeline through connecting pipelines. The device has the advantages that ammonia gas can be utilized at the maximum efficiency, waste caused by leakage of the ammonia gas is avoided, and compared with a traditional device, cost is saved to a great extent.

The invention provides a novel system for efficiently carrying out heat-work conversion by taking liquid ammonia / water as a circulating working medium, low-grade sensible heat can be recovered, latent heat is recovered by using an ammonia compressor to compress and heat a circulating working medium gasification heat source, and the heat-work or thermoelectric conversion efficiency is greatly improved. According to the invention, the liquefied latent heat of the working medium is effectively utilized as an internal heat source for circulating gasification, the economic and technical bottleneck of low efficiency of implementing low-grade thermoelectricity or heat-work conversion in the existing combined heat and power generation or ammonia working medium is well broken, the energy consumption and the working medium circulation amount can be greatly reduced, and the method has wide popularization and application values and is worthy of popularization and application. And greater economic and social environmental protection benefits can be created, and energy conservation and emission reduction are greatly realized.

The present application relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, comprising the following steps: mixing industrial-grade liquid ammonia with deionized water to prepare ammonia water with a free ammonia concentration of 60-120 ti (ti is the abbreviation of titer, which is 1 / 20 mol / L), controlling the temperature of the mixing process to be less than or equal to 40 DEG C to avoid ammonia volatilization, pre-carbonizing by passing in CO2 under the conditions of 20-70 DEG C and a carbon dioxide pressure of 0.1-0.6 MPa, and adding sodium sulfate or a mixture of sodium bicarbonate and mirabilite to obtain a pre-carbonized liquid. The present application adopts an integrated process of pre-carbonization, clarification, carbonization, ammonia separation and low-temperature crystallization, and ammonia evaporation circulation, and can be operated continuously or intermittently, has low industrial implementation difficulty, strong running stability, separates ammonium sulfate by using ammonia separation and low-temperature crystallization technology, replaces the traditional evaporation and concentration process, combines material recycling design, and reduces the energy consumption per unit product compared with the traditional process.

A hydrogen combustion-supporting liquid ammonia gas turbine combustor comprises a liquid ammonia fuel pipeline located at a center main shaft, a first-stage axial swirler and a first-stage radial swirler coaxially arranged outside the liquid ammonia fuel pipeline, and the swirler directions are the same and used for stabilizing the liquid ammonia flame. A pre-evaporation pipeline is arranged outside to form a hydrogen gas collecting chamber, and a center space of the pre-evaporation pipeline forms a primary air channel for completing pre-mixing swirl of liquid ammonia, hydrogen and air to stabilize the liquid ammonia flame. The pre-evaporated ammonia gas in the pre-evaporation pipeline enters a secondary air channel and completes pre-mixing swirl with air through a second-stage axial swirler. Secondary air holes are formed on a wall surface of a flame tube, a large amount of air enters to burn the fuel completely and improve combustion efficiency, and simultaneously dilutes tail gas to reduce NOx emission. The present application uses liquid ammonia as fuel, realizes stable liquid ammonia flame and reduces NOx emission through liquid ammonia fuel staging, hydrogen combustion-supporting, multi-stage swirl pre-mixing and staged combustion.

The invention discloses a multi-axis servo regulation and control liquid ammonia burner based on smoke backflow liquid ammonia vaporization and a control method, and relates to the field of clean energy equipment, the multi-axis servo regulation and control liquid ammonia burner comprises a liquid ammonia burner body, an annular liquid ammonia flow servo regulation mechanism, an annular liquid ammonia conveying and distributing mechanism, a liquid ammonia plasma ignition device, an ammonia combustion flame scanning mechanism and the like. The multi-axis servo motor drives the execution valves to adjust the flow ratio of liquid ammonia fuel to hot air in the fluid channels, meanwhile, liquid ammonia is vaporized through heat exchange of backflow smoke in the boiler and then fully premixed with the hot air to enter the boiler to be combusted, and efficient combustion of the ammonia fuel of the coal-fired boiler is achieved. The technical problems of large latent heat of vaporization of liquid ammonia fuel, continuous clean combustion of ammonia fuel, ammonia escape and control of NOX generated by combustion are solved.

The application discloses a kind of inlet passage liquid ammonia injection and exhaust gas circulation heat recovery system and method, it is related to the technical field of multi-fuel engine system, inlet passage liquid ammonia injection and exhaust gas circulation heat recovery system, comprising: liquid ammonia storage tank, liquid ammonia pressure stabilizing supply system, liquid ammonia nozzle, mixed heat exchanger, exhaust gas recirculation system and controller, controller calculates the real-time required liquid ammonia injection amount according to engine real-time working condition information and controls liquid ammonia nozzle work in real time, controller calculates the real-time required heat according to the real-time required liquid ammonia injection amount that liquid ammonia gasification and temperature rise to set temperature, according to the real-time required heat that liquid ammonia gasification and temperature rise to set temperature, calculate the real-time required exhaust gas, controller controls exhaust gas recirculation system according to real-time required exhaust gas amount and makes required amount of exhaust gas backflow into mixed heat exchanger.The application can improve engine system stability, improve engine efficiency, reduce pollutant emission.

The invention belongs to the technical field of glycine preparation, and particularly discloses a preparation method of glycine. The method comprises the following steps: controlling the reaction temperature, efficiently synthesizing ammonium chloroacetate from chloroacetic acid and liquid ammonia in a reactor, carrying out catalytic ammonolysis on the ammonium chloroacetate and ammonia gas in a reactor filled with a solid catalyst to realize continuity and reinforcement of the process, and carrying out alcohol precipitation crystallization, separation and purification to obtain glycine. The solid catalyst provided by the invention has the advantages of simple preparation, reproducibility, long service life, no metal pollution, easily available raw materials, controllable cost, long-acting cyclic utilization, high efficiency, simple recovery and the like; the method for preparing glycine by using the solid catalyst solves the problems of high consumption, high recovery cost, low production and purification efficiency and pollution caused by the traditional catalyst, and is a key technology for green and low-cost industrial production of glycine.

The application discloses a kind of ammonia hydrogen mixed natural gas combustion boiler test platform and its working method, test platform includes natural gas storage tank, hydrogen storage tank, liquid ammonia storage tank and liquid ammonia heating system, natural gas storage tank is connected with the multiple-component gas burner installed on gas boiler, hydrogen storage tank is connected with the multiple-component gas burner installed on gas boiler and is equipped with hydrogen flow regulating valve on connecting pipeline, liquid ammonia storage tank is connected with ammonia water pump, and ammonia water pump outlet is connected with liquid ammonia heating system, liquid ammonia heating system can heat liquid ammonia into ammonia gas of preset temperature, and the outlet of liquid ammonia heating system is connected with multiple-component gas burner and is equipped with ammonia gas main flow regulating valve on connecting pipeline.The application can realize zero carbon emission, and the system structure is reasonable, with the characteristics that heat can be matched and utilized in stages, providing a kind of thought for the development of industrial boiler in future.

The utility model discloses a device is unloaded to tank car with ice machine liquid ammonia simply, including compressor, ice machine system, liquid ammonia unloading pipeline, liquid ammonia pipeline, medium pressure nitrogen pipeline and tank car, ice machine system includes anti surge cooler, liquid ammonia storage jar and power saver, compressor links to each other with anti surge cooler, and anti surge cooler links to each other with liquid ammonia storage jar, and liquid ammonia storage jar links to each other with power saver, and power saver links to each other with the ammonia cooler of low temperature methanol washing system, and the ammonia cooler of low temperature methanol washing system links to each other with compressor, be connected with liquid ammonia pipeline on liquid ammonia storage jar, and liquid ammonia pipeline links to each other with tank car, be connected with liquid ammonia unloading pipeline on power saver, and liquid ammonia unloading pipeline links to each other with liquid ammonia pipeline, and medium pressure nitrogen pipeline links to each other with liquid ammonia pipeline and tank car. Advantage is: guarantee ice machine system supplement liquid ammonia and can utilize same pipeline safely and effectively when storing liquid ammonia in system and unloading, avoid the emergence of overpressure or leakage due to preparation use temporary pipeline and cause safety accident.

The invention belongs to the technical field of tert-butylamine preparation, and particularly relates to a preparation process for synthesizing tert-butylamine by adopting methyl tert-butyl ether. The preparation process comprises the following steps: preparing calcium alginate microspheres; preparing an SAPO precursor solution; performing composite crystallization; preparing an SAPO-11 carrier; preparing an ammonium type SAPO-11 carrier; preparing a metal supported catalyst; preparing an activated catalyst; methyl tert-butyl ether and liquid ammonia are used as raw materials, and tert-butylamine is prepared under the catalysis of an activated catalyst. According to the preparation process for synthesizing the tert-butylamine by adopting the methyl tert-butyl ether, the process of catalytically synthesizing the tert-butylamine by taking the methyl tert-butyl ether and the ammonia as raw materials follows an acid catalytic cracking nucleophilic addition coupling mechanism, and the prepared hierarchical pore CuZn / HSAPO11 catalyst remarkably reduces the reaction activation energy through the synergistic effect of B acid, L acid and metal active sites; high-activity and high-selectivity catalytic conversion at low temperature is realized, and high-purity tert-butylamine is prepared.

The application provides a kind of liquid ammonia production safety monitoring method.The method includes obtaining the liquid ammonia safety state parameter of liquid ammonia storage tank;The liquid ammonia safety parameter is stored and is processed with preset safety parameter, and the liquid ammonia storage difference component is obtained;According to the liquid ammonia supervision signal sent by the liquid ammonia storage difference component to chemical production system, the production early warning state of the liquid ammonia early warning device on the liquid ammonia storage tank is adjusted.Through the collection of liquid ammonia safety state parameter, the current safety production situation of liquid ammonia storage tank is determined, and the liquid ammonia safety parameter is stored and processed with preset safety parameter, which is compared with the current safety production state and standard production state of liquid ammonia storage tank to determine the difference degree of production state, and finally according to the difference degree reflected by the liquid ammonia storage difference component, the accurate leakage warning of liquid ammonia storage tank production is facilitated, and the ammonia leakage warning accuracy is effectively improved.

The application discloses application of a bimetallic catalyst in synthesis of ethylene amine and a synthesis method of the ethylene amine, and belongs to the technical field of synthesizing ethylene amine by an ethanol amine method. The synthesis of the ethylene amine takes monoethanolamine and liquid ammonia as raw materials, is carried out under hydrogen condition and under the action of the bimetallic catalyst, and the bimetallic catalyst is activated by low-temperature reduction or is not activated by reduction, and the temperature range of the low-temperature reduction activation is 110-220 DEG C. The synthesis method of the ethylene amine adopts the bimetallic catalyst activated by low-temperature reduction or not activated by reduction, and can obtain the catalytic activity and product selectivity equivalent to those of the bimetallic catalyst activated by high-temperature reduction in a conventional way, so that the overall economy and safety of production of the monoethanolamine hydrogenation to generate the ethylene amine are improved.

The application provides a liquid ammonia storage tank cleaning device and relates to the technical field of liquid ammonia storage.The device comprises a clamping mechanism for clamping a tank body, a mounting rack and a base frame, the clamping mechanism and the mounting rack are both mounted on the base frame, the mounting rack is provided with an extension mechanism, the end of the extension mechanism is rotatably provided with a frame body, a plurality of rotating frames are rotatably arranged on the frame body, and cleaning strips are arranged on the rotating frames; the rotating frames can rotate to push the cleaning strips close to the inner wall of the tank body, and the cleaning strips can deform along with the contour of the tank body and adhere to the inner wall of the tank body; the cleaning strips can be driven to be inclined or transversely arranged in the tank body by a driver; the rotating frames can rotate relative to the frame body and push the cleaning strips to move to the inner wall of the tank body and adhere to the inner wall of the tank body; the flexibility of the arc-shaped frame can make the cleaning strips deform when adhering to the inner wall of the tank body, so that the tank body is cleaned; the device can clean different vertical pipes and improve convenience for cleaning vertical, spherical and columnar tanks.