29 results about "Gaseous nitrogen" patented technology

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

A method of controlling nitrogen and oxygen content of synthetic air is disclosed. The method may include decomposing nitrous in a decomposition system by expanding liquid nitrous into gaseous nitrous in a decomposition chamber. A gaseous mixture of oxygen gas (O2), transient oxygen atoms (O), nitrogen gas (N2), and / or transient nitrogen atoms (N) may be obtained from the decomposition. The gaseous mixture may be provided to a test chamber that is at least initially devoid of receiving an additional nitrogen gas (N2) from either an N2 supply or a reservoir of air and / or at least initially devoid of receiving additional oxygen gas (O2) from the reservoir of air. The test material may be exposed to the gaseous mixture in the test chamber. A response of the test material to the gaseous mixture may be determined.

The utility model provides a cold energy recovery system, which comprises a gasification device, a cold energy recovery device and a cold energy recovery device, the cooling capacity storage device is connected with the gasification device and used for recycling the cooling capacity in the gaseous nitrogen, and a water supply pipe and a water return pipe are arranged on the cooling capacity storage device; the at least one terminal device is communicated with the cooling capacity storage device, the water supply pipe provides low-temperature water required by use for the terminal device, and the terminal device conveys the used water to the cooling capacity storage device through the water return pipe; the monitoring control device is connected with the cooling capacity storage device and the water supply pipe and used for monitoring the water temperature of the water supply pipe and controlling the flow of the gaseous nitrogen in the cooling capacity storage device; the temperature control valve is located on the water supply pipe and used for automatically adjusting water flow in the water supply pipe according to the monitored water temperature of the water supply pipe so as to maintain the water temperature in the water supply pipe within a preset range; and the cold energy is recycled and utilized in the liquid nitrogen gasification process, the effects of energy conservation and consumption reduction are achieved, and the application range is wide.

A method and apparatus for obtaining pressurized nitrogen by cryogenic separation of air in a distillation column system. The distillation column system comprises a high-pressure column (4), a low-pressure column (6), a main condenser (5), and a top condenser (7) of the low-pressure column. The evaporation space of the top condenser (7) is in the form of a forced-flow evaporator. The high-pressure column (4) has a baffle section (8) arranged directly above the point where the feed air (3) is introduced, and has 1 to 5 theoretical or actual plates. The oxygen-enriched liquid stream (11) introduced into the low-pressure column (6) is withdrawn from the high-pressure column (4) above the baffle section (8). The purified stream (9A) is withdrawn below the baffle section (8) and removed from the distillation column system (9B). The gaseous nitrogen streams (26A, 26B) are heated in a counter-current subcooler (12) by indirect heat exchange with the oxygen-enriched liquid stream (11) from the high-pressure column (4) before being heated in the main heat exchanger (2).

The present application relates to the field of low temperature biological preservation technology, and particularly relates to a low temperature biological sample transportation storage tank, which comprises an inner tank body provided with a vacuum interlayer and a double-layer structure, an inner tank body is internally provided with a placing rack for fixing biological sample storage equipment, and further comprises an outer tank body provided outside the inner tank body and provided with a heat preservation layer between the inner tank body and the outer tank body; a placing pipe is provided on the inner tank body and used for leading to the inside of the inner tank body. A normally closed sealing mechanism is arranged at the bottom of the placing pipe, the opening operation of the mechanism is driven by a gear and a rack, and a cooling mechanism is synchronously driven. When the disadvantageous operation of opening the placing pipe to access the sample occurs, the higher temperature nitrogen gas in the upper part of the gas phase zone can be automatically drawn back into the liquid nitrogen to be cooled and condensed, the temperature of the gas phase zone is effectively reduced, and the thermal shock of the sample exposure is reduced. Meanwhile, the gaseous nitrogen gas is pressed back into the liquid nitrogen, the partial liquefaction of the gaseous nitrogen gas is promoted, and the loss of the liquid nitrogen caused by the opening operation is reduced.

The utility model provides a rapid nitrogen liquefying device which comprises a PSA (Pressure Swing Adsorption) nitrogen making machine, a cold insulation box, a liquefying module arranged in the cold insulation box and used for liquefying gaseous nitrogen, and a circulating cooling module communicated with the liquefying module and used for receiving nitrogen generated by the PSA nitrogen making machine. The non-liquefied nitrogen is conveyed and cooled; wherein nitrogen produced by the PSA nitrogen making machine is conveyed into the circulating cooling module, after being cooled by the circulating cooling module, the nitrogen is conveyed into the liquefying module to be liquefied, part of the nitrogen is liquefied by the liquefying module, part of the nitrogen returns to the circulating cooling module to be circularly cooled, and the liquefied nitrogen is discharged through the liquefying module to be stored. Nitrogen can be rapidly generated through the PSA nitrogen making machine, and part of cooled nitrogen is liquefied into liquid nitrogen to be discharged and stored through the arrangement of the liquefaction module and the circulating cooling module, so that the nitrogen is conveniently stored while the nitrogen is rapidly obtained.

A method for extracting copper from sulphide mineral ore, comprising the following steps: stacking the ore to form a pile (heap), a leaching step, irrigating the pile with a first irrigating solution containing an acidic nitrate solution and nitrite, thereby causing the oxidation of sulfide minerals inside the pile, oxidation of gaseous nitrogen oxide released during the oxidation of sulfide minerals inside the pile with oxygen to form nitrogen dioxide, and hydrolysis of nitrogen dioxide to form nitric acid and / or nitrous acid in the first irrigating solution inside the pile, to continue the leaching stage and reduce nitrogen oxide losses from the pile.

The invention generally relates to nitrogen fixation using reactions in water containing microdroplets. In certain aspects, the invention provides methods of producing ammonia that involve generating a water containing microdroplet in presence of gaseous nitrogen from a gas source, wherein the water containing microdroplet comprises a metal catalyst and the metal catalyst reacts with the gaseous nitrogen to produce ammonia, optionally including in situ derivatization.

The invention belongs to the technical field of water treatment, and particularly relates to a low-carbon denitrification method for purifying and repairing an aquaculture water body. According to the method disclosed by the invention, a biological nitrogen removal system taking synchronous nitrification and denitrification as a core is constructed by directionally cultivating indigenous nitrogen removal flora in a water body and combining a special slow-release carbon source and a nitrogen removal catalyst, so that the conversion efficiency of harmful nitrogen forms such as ammonia nitrogen and nitrite into gaseous nitrogen is effectively improved; therefore, in-situ purification and resource utilization of nitrogen pollution are achieved in the breeding process. An ion balance environment beneficial to symbiosis of beneficial microorganisms and algae is constructed, so that cultured organisms are in a continuous and healthy growth environment, the disease occurrence rate is remarkably reduced, a green production mode that antibiotics, disinfectants and insecticides are rarely used in the whole culture process is achieved, and meanwhile the quality and safety of aquatic products are guaranteed. According to the method, a closed-loop culture mode of simultaneously culturing, purifying and repairing is realized, and the non-point source pollution pressure of aquaculture on the environment is effectively relieved.

This invention discloses a silicon-based composite material, the general chemical formula of which is: Li x SiO y N z The parameters are: 0 < x < 20, 0 < y < 5, 0 < z < 10; lithium accounts for 2%–20% of the mass of the silicon-based composite material; nitrogen accounts for 0.1%–20% of the mass of the silicon-based composite material. Scanning electron microscopy of particle cross-sections shows that the microstructure of the silicon-based composite material is a multiphase dispersed structure, obtained by mixing gaseous raw materials, including gaseous silicon source material, gaseous lithium source material, and gaseous nitrogen source material. The average particle size D of the silicon-based composite material particles is... 50 Within the range of 1nm-100μm, the specific surface area is 0.5m². 2 / g-40m 2 The silicon-based anode material disclosed in this invention exhibits high initial coulombic efficiency and good cycle performance.

The invention relates to the technical field of biological sample deep hypothermia automatic storage, in particular to a multi-channel automatic deep hypothermia biological sample storage device and system which comprises a liquid nitrogen tank, a rotating cage assembly, a lifting mechanism and an air curtain protection device. The liquid nitrogen tank adopts an inclined opening design, and the rotating cage is controlled by a driving system to rotate, so that the lifting basket reaches a target station. The lifting mechanism is provided with double lifting towers which correspond to independent access windows respectively, and double-channel synchronous lifting is achieved through a motor lifting module. The air curtain protection device gasifies nitrogen through liquid nitrogen to form an air curtain barrier covering the window. The control device receives an instruction through the data acquisition module, the processing module analyzes the instruction to generate a control signal, and the execution module adopts a PLC controller to synchronously operate the driving system and the lifting mechanism, so that sequential coupling of rotation of the rotating cage and lifting of the lifting basket is realized. According to the system, through a spatially isolated dual-channel architecture and a parallel control algorithm, the biological sample in-out warehouse efficiency is remarkably improved, and meanwhile, the stability of a deep hypothermia environment is maintained.

A process for reducing energy consumption in the storage of fruits and vegetables in cold rooms, where the cold used for storage is supplied by a given source, for example by mechanical refrigeration, is characterized by the fact that, in replacement of all or part of said source, liquid nitrogen is injected into the cold room where the products are stored, in order to effect a very rapid decrease in the temperature of the stored products, a decrease which, depending on the products considered, is within a chosen range of rate of decrease, the injection of nitrogen also making it possible to replace the air present in the cold room around the products with the gaseous nitrogen resulting from the vaporization of the injected cryogen.

The invention relates to a cryogenic fluid cooling installation comprising, a first circuit (7) of fluid to be cooled, for example liquid nitrogen and / or liquid oxygen, a cryogenic refrigerator (6) with a cycle circuit (16), at least one heat exchanger (5) ensuring heat exchange with the first circuit (7) of fluid to be cooled and the cycle circuit (16) of the refrigerator (6), the installation comprising a second circuit (8) of fluid to be liquefied, for example gaseous nitrogen and / or gaseous oxygen, the second circuit (8) of fluid being in heat exchange with the cycle circuit (16) of the refrigerator (6) in at least one heat exchanger (2, 3, 4, 5) of the installation,the installation (1) being configured to be switchable between a first cooling operating mode in which the installation cools the first fluid circuit (7) to cool a liquefied fluid to preferably generate a quasi-isothermal transformation of said fluid, and a second liquefaction operating mode in which the installation (1) cools the second fluid circuit (8) for the purpose of liquefying a gas stream. Abbreviated figure: Fig. 1,

The invention relates to a method for controlled deposition of a nitride layer (80) of a target nitride (82) on a substrate (70) in a thermal laser epitaxy (TLE) system (100), the target nitride (82) comprising a defined stoichiometric amount and being formed from one or more vaporized and / or sublimated source materials and nitrogen derived from a gaseous nitriding agent (54), the TLE system (100) further comprises a reaction chamber (10) and one or more laser sources (20) for providing a laser beam (22) within the reaction chamber (10). The invention further relates to a TLE system (100) which is designed to carry out the method.

A liquid nitrogen energy storage (LNES) system that includes a liquid charging mode and a power generating mode is provided. The disclosed liquid nitrogen energy storage system comprises a nitrogen liquefier designed to cool or liquefy a first portion of the gaseous nitrogen and a cold recovery heat exchanger designed to cool or liquefy a second portion of the gaseous nitrogen during a liquid charging mode and to warm a liquid nitrogen energy stream during a power generating mode. The liquid nitrogen energy storage system also includes a cold store configured to provide refrigeration for liquefaction of the second portion of the gaseous nitrogen in the cold recovery heat exchanger during the liquid charging mode and to warm a portion of the liquid nitrogen taken as a liquid nitrogen energy stream in the cold recovery heat exchanger during the power generating mode.

The application belongs to the technical field of intelligent control, and particularly relates to an automatic high-precision ultralow-temperature temperature control system and method, which comprises a liquid nitrogen tank, a gaseous nitrogen tank, a heat exchange pipe and a nitrogen storage tank. The application provides a full-automatic ultralow-temperature temperature control system with one-thousandth precision, so as to solve the problems of low precision and poor reliability in the refrigeration process and quickly provide an ultralow-temperature space. The principle of the temperature control method is to use PLC to realize automatic control of the pressure of the refrigerant in the low-temperature temperature control system, so as to accurately control the boiling point of the refrigerant, and the precision can be controlled to be 0.1%.

This invention relates to the field of air separation technology, and provides an integrated oxygen and nitrogen co-production separation device and method. The integrated oxygen and nitrogen co-production separation device couples an air compressor, a purifier, a nitrogen generation membrane, a distillation column, and other equipment. Using air as raw material, the air is compressed by the air compressor, and after the purifier removes water and carbon dioxide, it enters the membrane device to separate nitrogen (purity ≥95%) and oxygen-enriched air (purity ≥30%). The nitrogen (purity ≥95%) undergoes single-stage distillation in distillation column I to achieve the co-production of high-purity gaseous nitrogen (purity ≥99.999%) and liquid nitrogen. The oxygen-enriched air undergoes two-stage distillation in distillation columns II and III connected in series to achieve the co-production of low-purity gaseous oxygen (purity ≥99.5%), liquid oxygen (purity 93%), and high-purity oxygen (purity ≥99.999%).

A smoke dispensing system integrated into at least one bull head. The bull head has horns, eye holes, and a nose hole. A pressurized tank assembly, connection assembly, at least one valve, gas tank assembly, and computer produce smoke. The connection assembly connects the pressurized tank assembly to the gas tank assembly and the gas tank assembly to the at least one valve. The pressurized tank assembly pushes gaseous nitrogen or CO2 out of the gas tank assembly. The at least one valve controls the release of smoke produced by the nitrogen or CO2, remotely operated through a computer. The wall assembly serves as a stable mounting point for at least one bull head. When activated, the at least one valve releases smoke from the at least one bull head, creating a visually captivating and customizable experience. The integration of these components provides a unique and dynamic artwork experience.

The invention discloses an MgO / CoO heterojunction catalyst for catalyzing ozone to selectively oxidize ammonia nitrogen and a preparation method and application thereof, the catalyst is prepared by a hydrothermal-calcination two-step method, and a heterojunction structure of MgO lamellar crystals and CoO spinel is formed by controlling the molar ratio of cobalt to magnesium, the hydrothermal temperature and the calcination temperature. The technical problems that in a traditional ozone catalytic oxidation technology, ammonia nitrogen is excessively oxidized into nitrate, the nitrogen selectivity is low, and the catalyst stability is poor are solved. The catalyst is used for treating low-concentration ammonia-nitrogen wastewater under the conditions that the pH value is 9 and the room temperature is achieved, high ammonia-nitrogen removal rate and gaseous nitrogen selectivity are achieved with low dosage, the activity is not obviously reduced after the catalyst is recycled, and the catalyst is suitable for advanced nitrogen removal treatment of urban sewage.

This application relates to the field of heat dissipation technology, and discloses a cooling device and a liquid-cooled battery. The cooling device is applied in a storage tank containing electrolyte and includes a heat exchanger, a refrigeration module, a coolant, an aeration disc assembly, a gas source, a pump, and first, second, and third conduits. The first conduit connects the refrigeration module and the heat exchanger to form a closed loop for coolant flow. The aeration disc assembly is submerged in the electrolyte. The gas source supplies gaseous nitrogen to the gas layer in the storage tank via the second conduit. The third conduit connects the gas layer, the heat exchanger, the pump, and the aeration discs. The pump guides the gaseous nitrogen from the gas layer into the third conduit, and it flows sequentially through the heat exchanger and the aeration discs. In the heat exchanger, the gaseous nitrogen exchanges heat with the coolant to form cooled gaseous nitrogen. The cooled gaseous nitrogen is released into the electrolyte via the aeration disc assembly, forming multiple bubbles in the electrolyte to cool it.

The utility model discloses a nitrogen emptying and recycling device for a 400-cubic liquid nitrogen storage tank. The nitrogen emptying and recycling device comprises a separation tank, a first heat exchanger, a second heat exchanger and a collecting pipe, the top of the separation tank is connected with a blow-down pipe through a flange, a 45-degree inclined baffle is arranged in the separation tank, the bottom is connected with a first heat exchanger through a first heat exchange pipe, and the side is connected with a second heat exchanger through a second heat exchange pipe. The first heat exchange pipe and the second heat exchange pipe are provided with control valves, and the heat exchange branch pipe is communicated with the two pipes and provided with the control valves. The first heat exchanger is externally connected with a refrigeration house refrigeration loop for refrigeration house refrigeration; and the second heat exchanger is externally connected with a circulating water cooling loop, and the water temperature is reduced to 15-20 DEG C by converging nitrogen cooling capacity for heat dissipation of a cooling tower. After being gasified in the first heat exchanger, the liquid drops converge with gaseous nitrogen through the collecting pipe, heat exchange is conducted again in the second heat exchanger, and reheated nitrogen is conveyed to a nitrogen pipe network through the collecting pipe and the output pipeline. The device recovers cooling capacity in stages through the double heat exchangers, the heat exchange branch pipes and the control valves flexibly adjust airflow, the fluctuation of the emptying amount is adapted, and operation is stable.

The utility model discloses a gas temperature control mixing device and cold shield equipment, the gas temperature control mixing device comprises a gas mixing bottle, the gas mixing bottle is provided with a mixing cavity, and the mixing cavity is provided with a first gas inlet, a second gas inlet and a mixed gas outlet; the nitrogen mechanism is connected with the first gas inlet; the liquid nitrogen bottle is connected with the second gas inlet; the temperature control assembly is arranged between the nitrogen mechanism and the first gas inlet; and / or arranged between the liquid nitrogen bottle and the second gas inlet; the temperature control assembly comprises a first valve and a second valve, and the first valve is used for controlling the fluid supply flow of gaseous nitrogen or liquid nitrogen; the second valve is used for controlling the maximum fluid supply flow of gaseous nitrogen or liquid nitrogen. The gas temperature control mixing device further comprises a cold shield device which is located in a vacuum cavity of the cold shield device, the cold shield device comprises a cold shield device and a cooling pipe fixed to the outer portion of the cold shield device, the cooling pipe is wound around the outer portion of the cold shield device in a spiral mode, and the mixed gas outlet is connected with the gas inlet end of the cooling pipe through a connecting pipe.

An integrated industrial unit is provided, which can include: a nitrogen source comprising an air separation unit that is configured to provide pressurized gaseous nitrogen and liquid nitrogen; a hydrogen source; a hydrogen liquefaction unit, wherein the hydrogen liquefaction unit comprises a precooling system, and a liquefaction system; and a liquid hydrogen storage tank, wherein the precooling system is configured to receive the gaseous hydrogen from the hydrogen source and cool the gaseous hydrogen to a temperature between 70K and 100K, wherein the precooling system comprises a primary refrigeration system and a secondary refrigeration system, wherein the liquefaction system is in fluid communication with the precooling system and is configured to liquefy the gaseous hydrogen received from the precooling system to produce liquid hydrogen, wherein the liquid hydrogen storage tank is in fluid communication with the liquefaction system and is configured to store the liquid hydrogen received from the liquefaction system.

An enhanced structure for a plasma dissociation chamber in a production equipment process waste gas separation system allows individual or mixed waste gas from the process to enter a dissociation chamber of a waste gas plasma processor via separate gas pipelines. A vertical plasma body is positioned in the center of the dissociation chamber, which is then supplied with nitrogen working gas to dissociate the tail gas containing the special gases generated in the waste gas within the dissociation chamber at high temperature. The key feature is that an air supply pipeline is introduced into the high-temperature middle section of the heating flame formed by the plasma body within the dissociation chamber. This reduces the high-temperature reaction zone generated in the front section of the heating flame, resulting in a faster and more direct dissociation reaction rate in the rear section of the heating flame after air supply. It also reduces the generation rate of NOx (gaseous nitrogen oxides) and shortens the cooling chamber at the rear of the heating flame in the dissociation chamber, thereby reducing the overall length and installation cost of the plasma processor.

The utility model relates to the technical field of clamps, and discloses an aircraft part processing, positioning and clamping device, which comprises a base station, clamping assemblies for clamping are arranged on the two sides of the base station; the lifting structure comprises a base plate, a partition plate, a gas heat exchange cavity and a liquid heat exchange cavity, the base plate is fixedly installed on the top of the base table, the partition plate is fixedly connected with the base plate, the interior of the base plate is hollow, and the partition plate divides a cavity of the base plate into the gas heat exchange cavity and the liquid heat exchange cavity. The gas source is a gaseous nitrogen storage bottle, the water source can be tap water, nitrogen is fed into the gas heat exchange cavity, low-temperature water is fed into the liquid heat exchange cavity, and heat at the position where a workpiece is attached to the base plate is taken away through the two media, so that the workpiece is at the stable temperature in the machining process; workpiece deformation caused by overlarge temperature difference is prevented from influencing the machining precision, the quality of the workpiece is improved, and the machining precision is guaranteed.

A process for supplying subcooled liquid CO2 to a site comprising a user station of this liquid CO2, from a liquid CO2 storage tank, site where there is a source of liquid nitrogen suitable for supplying gaseous nitrogen to a user station of this gaseous nitrogen, according to which: a first cooling of liquid CO2 taken from said CO2 storage is organized by heat exchange in an exchanger with liquid nitrogen taken from said nitrogen storage, and the CO2 thus subcooled to a first temperature is returned to the CO2 storage, the taking and the exchange being carried out when there is a demand for consumption of gaseous nitrogen by said nitrogen user station;the consumption of CO2 and nitrogen by said user stations may be synchronized or not, and in that when they are not synchronized, when there is a demand for consumption by the subcooled CO2 consuming station, liquid CO2 is taken from said CO2 storage and this taken CO2 is subjected to a second cooling, by heat exchange in said exchanger with liquid nitrogen taken from said nitrogen storage, to lower the temperature of the taken liquid CO2 to a second temperature, lower than the first temperature; then the liquid CO2 thus subcooled at this second temperature is directed to the user station of this CO2.;

The invention relates to aluminum nitride aerogel and a preparation method, and belongs to the technical field of material preparation. The method comprises the following steps: sequentially carrying out acid pickling treatment and vacuum drying on aluminum powder of which the median particle size D50 is 0.1-100 microns and the purity is greater than or equal to 99%, so as to obtain pretreated aluminum powder; the pretreated aluminum powder, a solid nitrogen source, a guiding agent and a pore forming agent are subjected to ball-milling mixing, and a mixed material is obtained; carrying out heating reaction on the mixed material in a nitrogen source atmosphere to obtain a porous aluminum nitride block material; and sequentially carrying out crushing treatment and grading treatment on the porous aluminum nitride block material to obtain the aluminum nitride aerogel powder.

A plasma cooling chamber spray structure for removing process waste gas from production equipment allows individual or mixed process waste gases to enter a dissociation chamber of a waste gas plasma processor via separate gas pipelines. A vertical plasma body is located in the center of the dissociation chamber, which, in conjunction with the introduction of working gas nitrogen, dissociates the tail gas containing the special gas generated in the dissociation chamber at high temperature. A cooling chamber is connected to the rear end of the dissociation chamber, and the cooling chamber has an outer cylinder connected to the dissociation chamber and a short section relative to the tail end of the heating flame section of the plasma body. An inner cylinder of an outer cylinder is characterized by having multiple annularly arranged spray nozzles on the inner edge surface of the outer cylinder, each spray nozzle spraying water onto the outer edge surface of the inner cylinder to provide water cooling in addition to air cooling for the cooling chamber. Because the entire cooling chamber is cooled earlier, the dissociation of nitrogen at high temperature is reduced, thus greatly reducing the generation rate of NOx (gaseous nitrogen oxides) in the cooling chamber. Consequently, the cooling chamber can be shortened, thereby reducing the overall length and installation cost of the plasma processor.

The utility model relates to the technical field of aerobic fermentation equipment, in particular to an aerobic fermentation bin device combining nitrogen-containing gas control and nitrogen fixation, which comprises a support plate, the lower end of the support plate is fixedly connected with a plurality of support legs, and the upper end of the support plate is sequentially provided with a fermentation tank and a gas storage barrel at intervals from left to right. A gas conveying pipe is communicated between the fermentation tank and the gas storage barrel, and a sealing cover is arranged at the upper end of the fermentation tank. The adjusting assembly arranged on the fermentation tank comprises the temperature sensor, the heating device and the cooling device, so that the fermentation temperature can be accurately controlled to be about 55 DEG C, the nitrous oxide is high in volatility, and the volatilization of the nitrous oxide can be influenced when the temperature is too high or too low; the temperature is stabilized, so that the loss of gaseous nitrogen caused by excessive volatilization of nitrous oxide can be reduced, effective control on nitrogen-containing gas is realized, and meanwhile, the stirring assembly can be used for stirring fermentation materials, so that the fermentation is more sufficient.