93 results about "Nitrogen Handling" patented technology

The invention relates to a method and device for preparing Ti-TiN core-shell powder, and the method comprises the steps that in an atomizing chamber, mixed gas is blown to a molten pool on the surface of an electrode bar, liquid drops are subjected to primary refining and primary coating nitrogen increasing treatment, the mixed gas comprises argon and nitrogen, and the volume content of the nitrogen does not exceed 10%; high-temperature pure nitrogen is blown to the flying liquid drops, so that secondary refining and secondary coating nitrogen increasing treatment are carried out, and the temperature of the high-temperature pure nitrogen is 1000-1500 DEG C; the powder which is not fully coated and the powder which is fully coated are separated through an electrostatic separation device; and the powder which is not fully coated is subjected to third-time coating nitrogen increasing treatment, so that the Ti-TiN core-shell structure powder is obtained. The prepared powder is core-shell powder with large thickness and small fineness, the yield is high, the shell layer structure is uniform, the sphericity degree of the powder is high, and the preparation efficiency is high.

The invention discloses a 38CrMoAl material and a vacuum nitriding method, and relates to the field of nitriding processes of special-shaped parts, and the nitriding method comprises the steps that S1, after a 38CrMoAlA steel part is put into a furnace, the furnace is filled with air, heating is conducted, pre-oxidation is conducted, and a pre-oxidation workpiece is obtained; s2, vacuumizing, refilling nitrogen, and raising the temperature to a nitriding temperature; s3, after the temperature is increased to the nitriding temperature, ammonia cracking gas is introduced into the furnace for nitriding treatment; and S4, nitrogen removal. And the problem of furnace temperature uniformity in the vacuum nitriding process can be effectively improved. According to different nitriding stages, the concentration of nitrogen atoms in the furnace can be automatically and accurately controlled, the ammonia gas consumption is reduced, and the nitriding layer depth and the nitriding layer quality are improved.

The invention discloses an ammonia nitrogen treatment system and method for coke oven gas direct reduction factory wastewater. Comprising an aeration tank, an inclined tube sedimentation tank, a dosing device, a buffer water tank, a quartz sand filter, a middle water tank, a mixer, a liquid caustic soda storage tank, a deamination tower kettle, a discharged pH regulating tank, a sulfuric acid storage tank, an ammonium sulfate circulating tank, an aeration fan, an air stripping fan, a gas buffer bag, an ammonium sulfate circulating pump and a sulfuric acid pump, an ammonia-nitrogen-containing wastewater pipeline is sequentially communicated with an aeration tank and an inclined tube sedimentation tank, an overflow port of the inclined tube sedimentation tank is communicated with a water inlet of a buffer water tank, and a water outlet of the buffer water tank is sequentially communicated with a quartz sand filter, a middle water tank, a mixer and a deamination tower kettle; the aeration fan is communicated with an air inlet of the aeration box, the dosing device is communicated with a dosing port of the inclined tube sedimentation tank, and the liquid caustic soda storage tank is communicated with a caustic soda inlet of the mixer. After the system and the method are adopted for treatment, the ammonia nitrogen of the effluent stably reaches the standard, the pH value is stable, and the effluent meets the first-level wastewater discharge standard of the national Integrated Wastewater Discharge Standard.

The invention aims to provide a heat treatment-liquid nitrogen treatment-cryogenic forging composite forming method for obtaining an alpha '+ alpha' double-phase martensitic structure titanium alloy, and belongs to the technical field of titanium alloy plastic processing and heat treatment. Through liquid nitrogen treatment, the sample obtains a uniform cryogenic temperature and stabilizes an alpha'martensite phase structure; alpha'martensite to alpha '' martensite phase transformation of the alloy is promoted through cryogenic forging. And finally, obtaining the needle-shaped alpha '+ alpha' 'biphase martensitic structure titanium alloy forge piece based on the synergistic effect of heat treatment, liquid nitrogen treatment and cryogenic forging. Compared with traditional cryogenic forming of the titanium alloy, the method can achieve uniform distribution of nanoscale alpha '+ alpha' 'biphase martensite in the titanium alloy forge piece, meanwhile, the technological process is simple, and actual production is easy.

The invention belongs to the technical field of sewage denitrification treatment, and particularly relates to an integrated energy-saving denitrification device and method.The integrated energy-saving denitrification device comprises a treatment pond, the two sides of the treatment pond are both communicated with sewage inlet and outlet pipelines, and one end of the top of the treatment pond is fixedly connected with a mounting frame; and a hopper used for adding base material particles is fixedly mounted in the mounting frame. According to the integrated energy-saving denitrification device, the reaction frame and the driving mechanism are arranged, so that base material particles reacted with sewage do not need to be fished, the use convenience of the base material particles is improved, the reaction speed of the base material particles and the sewage is increased, the reaction efficiency of denitrification treatment of the sewage is improved, and the sewage treatment efficiency of the integrated energy-saving denitrification device is improved; and the material changing mechanism is arranged, so that the base material particles in the reaction frame can be automatically replaced while the sewage treatment is performed in the treatment tank.

The full-automatic powder packaging equipment with the low residual oxygen content comprises a main machine frame and a packaging bag feeding machine, a main filling mechanism, an air exhaust mechanism, an auxiliary filling machine, a bag opening and edge pressing mechanism and a heat sealing machine are sequentially arranged on the main machine frame, a main conveying line and a weighing belt conveyor are fixedly connected to the main machine frame, the main conveying line is divided into two sections, and the weighing belt conveyor is arranged on the main conveying line. The two main conveying lines are connected with the two ends of the weighing belt conveyor in an end-to-end mode respectively, a vibration assembly is arranged on the main conveying lines and located below the air exhaust mechanism and the bag opening and edge pressing mechanism, and the feeding end of the Y-shaped material box is fixedly connected with an annular inflation pipe. The powder material bagging and filling device has the following beneficial effects that automatic bagging, filling, exhausting and nitrogen filling treatment of powder materials can be achieved, air and powder among the powder materials can be well removed in the packaging process, the residual oxygen amount of packaging is effectively reduced, and the packaging quality is improved.

The invention discloses a high-concentration ammonia nitrogen treatment device and method for condensate of a coal chemical enterprise. The high-concentration ammonia nitrogen treatment device comprises a raw water storage system, a pretreatment system, an ammonia stripping system, an ammonia gas recovery system, a post-treatment system and an automatic control system, the raw water storage system, the pretreatment system, the ammonia stripping system, the ammonia gas recovery system and the post-treatment system are connected in sequence; the automatic control system is respectively connected with the raw water storage system, the pretreatment system, the ammonia stripping system, the ammonia gas recovery system and the post-treatment system. By adopting the technical scheme, the effects of remarkably reducing energy consumption, realizing resource utilization, being low in investment cost, low in operation cost, profitable, high and stable in treatment efficiency, high in automation degree, small in occupied area, capable of eliminating secondary pollution, high in adaptability, simple and convenient to maintain and short in investment payback period can be achieved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a denitrification reactor, a denitrification method and application. The denitrification nitrogen removal reactor comprises a denitrification nitrogen removal reactor body, wherein a water distribution pipe, a filler layer and a water collection device are sequentially arranged in the denitrification nitrogen removal reactor body from bottom to top; one end of the water distributor communicates with the pulsed water source; filler in the filler layer comprises a hydrophilic sulfenyl denitrification electron donor; and the particle size of the hydrophilic sulfenyl denitrification electron donor is 0.5-1.5 mm. According to the invention, a hydrophilic sulfenyl denitrification electron donor with a specific particle size is adopted as a filler, pulse water feeding is adopted, periodic hydraulic disturbance is generated in the reactor, and filler particles are pushed to generate pulse fluidization, so that efficient denitrification nitrogen removal treatment is realized, and the nitrogen removal efficiency can exceed 90%. Meanwhile, the denitrifying nitrogen removal reactor is simple in structure, easy to maintain and suitable for small and medium-sized sewage stations and distributed nitrogen removal scenes.

The utility model discloses a nitrogen preservation device for beverage filling, which comprises a mounting rack, a beverage can body is arranged on the mounting rack, an adjusting mechanism is mounted on the mounting rack, the adjusting mechanism is matched with the beverage can body, and a liquid injection mechanism, a nitrogen filling mechanism and a rotating mechanism are mounted on the adjusting mechanism. Through the arrangement of the rotating shaft, the beverage filling head, the nitrogen filling head, the first motor, the rotating shaft, a positioning hole and other structures, when nitrogen filling is conducted on the beverage can body for freshness retaining, the nitrogen filling head on the rotating shaft only needs to be aligned with the beverage can body for nitrogen filling treatment, and after nitrogen filling is finished, the rotating shaft only needs to be rotated, so that the beverage can body can be kept fresh; according to the beverage can, the beverage infusion head can be conveniently aligned with the beverage can body to infuse beverage, so that nitrogen filling and beverage infusion can be performed on the beverage can body at the same position, and the situation that air enters the beverage can body due to nitrogen volatilization in the conveying process can be effectively avoided.

The present invention relates to the field of leachate treatment technology, specifically a landfill leachate ammonia nitrogen treatment equipment, including a frame, and also including: an aerobic nitrification reaction structure connected to the frame; two groups of anaerobic denitrification reaction structures connected to the frame; a bubble scrubbing spoiler structure connected to the frame, the bubble scrubbing spoiler structure including an active telescopic frame, the movable end of the active telescopic frame is fixedly connected to a first rotating head, the first rotating head is connected to an air supply part, the first rotating head is rotatably connected to a second rotating head, the second rotating head is fixedly connected to a hollow frame, the hollow frame is hinged with a change-direction jet part, the change-direction jet part is connected to a swing drive part, and the change-direction jet part is connected to a pitch drive part. The present invention disperses the bacterial colony attached to the inner wall of the aerobic nitrification reaction structure and completes the stirring of the leachate, while ensuring sufficient oxygen supply to the bacterial colony, improving the speed of the aerobic nitrification reaction, thereby improving the treatment efficiency of the present invention for the leachate.

This invention discloses a low-temperature nitriding system, comprising a horizontal frame, a lower mold assembly, an upper mold assembly, a mold closing drive mechanism, multiple solid nitrogen source sheets, and a reciprocating drive mechanism. The lower mold assembly is located at the bottom of the frame, with a lower semi-circular groove on its upper surface. The upper mold assembly is movably mounted on the frame, with an upper semi-circular groove on its lower surface. When the upper and lower molds are closed, a cylindrical cavity with a diameter larger than that of a steel rod is formed. Multiple solid nitrogen source sheets are arc-shaped and respectively adhered to the inner walls of the grooves in the upper and lower molds. The mold closing drive mechanism drives the upper mold to move downwards, causing the nitrogen source sheets to adhere tightly to the surface of the steel rod. The reciprocating drive mechanism drives the steel rod to reciprocate axially, causing relative sliding between the steel rod surface and the nitrogen source sheets, inducing nitrogen atom infiltration through frictional heat and plastic deformation. This invention requires no external heating, has extremely low energy consumption, avoids thermal deformation problems, has high nitrogen atom utilization, and has a simple structure.

The present application relates to sewage denitrification treatment technical field, specifically to a kind of high-efficiency denitrification filter, including filter water pool body, water inlet groove, water supply groove, reaction cavity, filter baffle, water guide assembly, outlet pipe, backwashing component, overflow notch, collection tank and control assembly;The inside of the filter water pool body is provided with multiple reaction cavities, the reaction cavities are parallelly arranged between each other, the water inlet groove is opened in the upper portion of filter water pool body, the water supply groove is arranged on the top of reaction cavity, the filter baffle is installed at the bottom of reaction cavity, the water guide assembly is installed below filter baffle, the outlet pipe is installed in the side of water guide assembly, the backwashing component is arranged on the outer side of water inlet groove, the overflow notch is opened in the side of filter water pool body, the collection tank is arranged outside overflow notch, and the control assembly is installed inside reaction cavity.

The invention belongs to the technical field of heat treatment furnace auxiliary control devices, and particularly discloses a vacuum heat treatment furnace air cooling control device which comprises a heat treatment furnace body, a transmission cavity is formed in the inner bottom face of the heat treatment furnace body, a rotating disc is rotationally arranged between the inner walls of the transmission cavity, and the bottom of the rotating disc is slidably clamped to the side wall of the transmission cavity. When a workpiece is heated to a certain temperature, the feedback assembly can be triggered to work, the transmission assembly is cut off when the feedback assembly works, so that the rotating disc stops rotating, and the workpiece is heated to a certain temperature. Meanwhile, nitrogen introduced by the gas inlet pipe cap is introduced into the heat treatment furnace body to blow the outer surface of the heated workpiece, so that the outer surface of the workpiece can be subjected to nitriding treatment, and when the feedback assembly works, the gas filtering assembly can be conducted, so that the nitrogen blowing the workpiece is filtered by the gas filtering assembly and then discharged; and carried dust is prevented from polluting air in a workshop.

The present application relates to the field of pesticide wastewater nitrogen removal equipment, specifically to a pesticide production wastewater total nitrogen detection and treatment equipment, which comprises a treatment tank, a driving motor is fixedly connected to the middle position of the top of the treatment tank, and the rotating end of the driving motor is fixedly connected with a transmission shaft, the inner top surface of the treatment tank is fixedly connected with an adjusting cylinder matched with the transmission shaft, and the equipment further comprises an aeration adjusting mechanism, which is movably installed between the surface of the adjusting cylinder and the surface of the transmission shaft, and the transmission shaft drives the aeration adjusting mechanism to operate to uniformly distribute oxygen in the treatment tank. The pesticide production wastewater total nitrogen detection and treatment equipment is composed of an aeration adjusting mechanism and a pollution cleaning mechanism; when the nitrifying bacteria in the treatment tank need to react through oxygen, the aeration component can rise, expand and rotate in the treatment tank under the action of the aeration mechanism, so that the oxygen is uniformly dispersed in the treatment tank, thereby improving the nitrogen removal treatment effect.

The invention discloses a high-boron high-chromium alloy cast iron fire grate bar of a sintering machine trolley furnace and a manufacturing method of the high-boron high-chromium alloy cast iron fire grate bar, and belongs to the technical field of smelting equipment, and the high-boron high-chromium alloy cast iron fire grate bar comprises the following material components in percentage by mass: 0.1-5% of B, 1.0-2.0% of C, 0.5-1.5% of Si, 0.5-1.5% of Mn, 15.0-22.0% of Cr, 0.1-2% of Ni, 0.1-2% of Mo, 0.01-0.06% of P, 0.01-0.06% of S and the balance of Fe. Comprising the following steps: modeling a casting casting model, preparing furnace charge according to the percentage, performing conventional deoxidization and nitrogen fixation treatment on a melt during smelting, controlling the smelting temperature to be 1500-1600 DEG C, immediately pouring after smelting to the temperature, controlling the pouring temperature to be 1450-1550 DEG C, and performing sand removal and cleaning on the cast fire grate casting, thereby obtaining the fire grate casting which can be used without heat treatment. The material can resist high-temperature oxidation, the strength and toughness in a high-temperature environment are improved, the service life is greatly prolonged, and the operation efficiency of equipment is improved.

The application relates to the technical field of sewage treatment, in particular to a sulfur autotrophic denitrification and nitrogen removal treatment device, which comprises an integrated box, a second turnover plate rotatably installed at the front end of the integrated box, a first turnover plate rotatably installed at the edge position of the top end of the integrated box, and a PLC controller fixedly installed at the front end of the integrated box. The multiple treatments of the ultrafiltration membrane tube, the autotrophic denitrifying bacteria and the active carbon filter plate can guarantee the sewage treatment effect, can make the autotrophic denitrifying bacteria in a suitable survival environment, can guarantee the nitrogen removal effect, are energy-saving and environment-friendly, are convenient to use, can conveniently replace the active carbon filter plate, can guarantee the purification effect of water, can reduce the resistance received by the movable ring during the sliding process on the threaded screw rod in the process of replacing the active carbon filter plate, are favorable for the up-and-down movement of the sealing plate, and are favorable for the replacement of the active carbon filter plate.

The invention discloses a chemical wastewater biological denitrification device, and relates to the technical field of chemical wastewater. The device comprises a supporting frame, a denitrification barrel is arranged at the center of the top of the supporting frame, an annular limiting groove is formed in the bottom of the inner wall of the denitrification barrel, a drainage pipe is arranged at the bottom of the denitrification barrel, a control assembly is arranged at the top of the denitrification barrel, a water guide pipe is arranged in the control assembly, the bottom of the water guide pipe penetrates through the denitrification barrel, and two liquid injection openings are formed in the top of the denitrification barrel; the two liquid injection ports are symmetrically distributed about the axis of the denitrification barrel, and a cambered surface base is fixedly mounted at the bottom of the inner wall of the denitrification barrel. The separation filter plate is promoted to block and separate large mud blocks or impurities in wastewater, and small mud blocks are promoted to quickly fall down to synchronously perform nitrogen removal treatment with the wastewater in the up-down movement process of the separation filter plate, so that the situation that nitrogen in large mud is difficult to discharge is effectively prevented; therefore, the heterotrophic denitrifying bacteria have poor nitrogen removal effect on the wastewater and are directly discharged to cause environmental pollution.

This invention discloses a method and system for treating wastewater effluent from a wastewater treatment plant. The method includes the following steps: acquiring parameter data of the effluent, including total phosphorus, suspended solids concentration, total nitrogen, and chemical oxygen demand (COD); selecting a corresponding effluent treatment method based on the parameter data, wherein the treatment method includes sedimentation, denitrification, and / or COD removal; and discharging the treated effluent into a clear water tank. This invention, through data analysis, customized treatment strategies, and discharge mechanisms, can flexibly adjust the treatment method according to the effluent conditions, achieving efficient pollution removal and cost savings.

The utility model relates to the technical field of wastewater treatment, and discloses a biological denitrification treatment device for mixed acid pickling wastewater, which comprises a treatment box, a partition plate is fixedly connected to an inner cavity of the treatment box, and the partition plate divides the inner cavity of the treatment box into a biological reaction cavity and an aeration cavity left and right. A sedimentation cavity is formed in the bottoms of the biological reaction cavity and the aeration cavity, a biological treatment mechanism is connected to the interior of the biological reaction cavity, an aeration mechanism is connected to the bottom of the aeration cavity, a mounting plate is fixedly connected to the top of a treatment box, a water tank is connected to the left side of the mounting plate, and a flow dividing pipe is arranged on the left side of the water tank; and a reflux pump is fixedly mounted on the right side wall of the treatment box. By arranging the biological treatment mechanism, the aeration mechanism and the reflux pump, ammonia nitrogen and organic matters in wastewater are effectively removed, and the biological filler plate is an independent module, so that a damaged or aged plate is conveniently and quickly replaced, and the cost and time are reduced.

The invention relates to a low-moisture ionic liquid storage and transportation kit suitable for a battery small-scale experiment and a preparation method of the low-moisture ionic liquid storage and transportation kit, and relates to the technical field of ionic liquid storage, packaging and preparation. Comprising a kit body, an ampoule bottle and ionic liquid, the ampoule bottle is arranged in the kit body; the water content of the ionic liquid is less than or equal to 20ppm, and the ionic liquid is prepared by a dehydration pretreatment process of vacuum film evaporator film scraping or molecular sieve adsorption; the ampoule bottle is made of a neutral borosilicate glass material, the interior of the ampoule bottle is subjected to nitrogen charging treatment in advance, the nitrogen purity is larger than or equal to 99.999%, the nitrogen charging pressure is 0.1-0.15 MPa, and the nitrogen charging time is 2-5 s; the ionic liquid is quantitatively filled into the nitrogen-filled ampoule bottle through an ampoule wiredrawing filling and sealing machine, and a sealing unit is formed through flame sealing. According to the invention, absolute water-proof oxygen-proof storage and transportation of the ionic liquid can be realized, the dosage requirement and the rapid screening requirement of small-scale experiments are met, the automation level, the precision and the stability of kit preparation are improved, and the production cost is reduced.

The carbonaceous material that is activated to form the precursor activated carbon is further improved by doping with copper and nitrogen and calcination. The resulting adsorbent has excellent catalytic properties that are useful in the field of fluid purification.

The invention discloses a method for treating catalyst wastewater by a combined biochemical denitrification method, which adopts fluidized bed anaerobic denitrification (ADFB), two-stage AO, a secondary sedimentation tank and a biological filter, the wastewater enters an ADFB anaerobic denitrification fluidized bed system after the water quality is balanced by a regulating tank, and after most of total nitrate radicals in the water are removed, the wastewater enters a two-stage A / O system to further remove organic matters and SS (suspended solids) in the water; the wastewater, backwashing water of the reverse osmosis system, concentrated water and the like jointly enter a biological aerated filter system for treatment, and finally the wastewater reaches the standard and is discharged.

The application discloses a preparation method of high-nitrogen steel powder with super-high nitrogen content, and specifically comprises the following steps: adding high-nitrogen steel powder into a vacuum boiler with nitrogen gas flowing therethrough for heating, and continuously stirring the powder to uniformly heat the powder and avoid agglomeration; after proper heat preservation, opening a filter screen window under the boiler and a lower powder outlet of the boiler, and under the action of high-pressure nitrogen gas jet, the powder in the boiler is screened through the filter screen; the screened powder falls into a liquid nitrogen pool for rapid cooling and nitrogen dissolving treatment; after the powder is treated in the liquid nitrogen for a certain time, the filter screen at the bottom of the liquid nitrogen pool is opened to treat the excess liquid nitrogen and screen the powder, and finally, the high-nitrogen steel powder with super-high nitrogen content is obtained in the liquid nitrogen pool. The method can obtain the high-nitrogen steel powder with super-high nitrogen content on the basis of traditional high-nitrogen steel powder preparation, and has the advantages of simple process, low cost, high practicability, easy industrial production and the like.

The application discloses a coke oven gas direct reduction plant wastewater ammonia nitrogen treatment system and method, which comprises an aeration tank, an inclined tube sedimentation tank, a dosing device, a buffer water tank, a quartz sand filter, an intermediate water tank, a mixer, a liquid alkali storage tank, a deamination tower kettle, an external discharge pH adjusting tank, a sulfuric acid storage tank, an ammonium sulfate circulating tank, an aeration fan, a stripping fan, a gas buffer bag, an ammonium sulfate circulating pump and a sulfuric acid pump; ammonia nitrogen-containing wastewater pipelines are sequentially connected with the aeration tank and the inclined tube sedimentation tank, the overflow port of the inclined tube sedimentation tank is connected with the water inlet of the buffer water tank, and the water outlet of the buffer water tank is sequentially connected with the quartz sand filter, the intermediate water tank, the mixer and the deamination tower kettle; the aeration fan is connected with the gas inlet of the aeration tank, the dosing device is connected with the dosing port of the inclined tube sedimentation tank, and the liquid alkali storage tank is connected with the alkali inlet of the mixer. After being treated by the system and method, the ammonia nitrogen in the effluent is stable and up to the standard, the pH value is stable, and the wastewater discharge meets the first-level standard of the national wastewater comprehensive discharge standard.

The utility model discloses a wastewater biological denitrification device which comprises a bioreactor and a sedimentation tank connected with the bioreactor through a pipeline, the bioreactor comprises a water tank, a top plate, a water guide mechanism, a floating type liquid guide assembly, a partition plate and a driver, and the top plate is located at the top of the water tank; the water guiding mechanism is installed on the top plate and composed of a liquid inlet pipe and flow dividing pipes, the liquid inlet pipe is connected with the flow dividing pipes, the floating type liquid guiding assemblies are evenly installed on the flow dividing pipes, and each floating type liquid guiding assembly comprises a water guiding pipe, a spraying pipe, a floating lantern ring, blades and a ball. The multiple sets of spray pipes are symmetrically installed on the water guide pipe, the floating lantern ring is slidably embedded in the lower end of the water guide pipe in a sleeving mode, and the two sets of blades are arranged. According to the biological denitrification device for the wastewater, disclosed by the utility model, high-efficiency denitrification treatment on the wastewater can be realized, and effective microbial strain introduction and denitrification treatment are carried out on sediments in the wastewater.

The invention discloses a nitriding treatment device and process for an iron pan, the nitriding treatment device for the iron pan is provided with a cyclic utilization system, and collected ammonia gas can be reused in a cooling stage. According to the nitriding furnace, mixed gas of ammonia gas and hydrogen in the nitriding furnace is discharged by arranging the exhaust system, the ammonia gas is separated from the hydrogen and the hydrogen is collected by utilizing the characteristic that the ammonia gas is easily dissolved in water, and ammonia water formed by dissolving the ammonia gas in water is introduced into the cooling chamber of the nitriding furnace by arranging the cooling system; the ammonia water is separated from water by absorbing the temperature of the nitriding furnace, dried, compressed and then introduced into the nitriding furnace, so that the nitrogen environment in the nitriding furnace is kept, air is prevented from entering the nitriding furnace to influence an iron pan in a nitriding cooling stage, and the use of ammonia in an ammonia storage tank in the cooling stage is reduced; water in the water storage tank is pumped into the ammonia gas recovery water tanks to be supplemented, the dissolving amount in the ammonia gas recovery water tanks can be increased, in addition, the two ammonia gas recovery water tanks are arranged, and when one ammonia gas recovery water tank is used for cooling the nitriding furnace, the other ammonia gas recovery water tank is used for dissolving a small amount of ammonia gas discharged from the nitriding furnace.

The invention relates to a natural gas liquefaction denitrification device and method, and the natural gas liquefaction denitrification device comprises a first heat exchanger; a gas phase outlet of the heavy hydrocarbon separator is connected with a second heat exchanger, the second heat exchanger is connected with a third heat exchanger, and the third heat exchanger is connected with the denitrification tower through a pipeline. The natural gas liquefaction denitrification method comprises the following steps: cooling raw material gas; carrying out gas-liquid separation treatment on the cooled feed gas; cooling the gas phase; and carrying out nitrogen removal treatment on the gas phase by using a nitrogen removal tower. The technical scheme provided by the invention has the beneficial effects that the nitrogen is separated by fully utilizing the cold energy produced by the mixed refrigerant, the nitrogen separation efficiency is high, meanwhile, the number of equipment is small, the energy consumption is reduced, the engineering investment is reduced, the economic benefits of enterprises are improved, and the aim of removing the nitrogen is fulfilled by only arranging one denitrification tower. According to the technical scheme, the nitrogen-containing feed gas is subjected to liquefaction denitrification to obtain a product with corresponding purity, so that the economic value of the product is improved.

The invention discloses a pit-type nitriding furnace with a leakproof function, and relates to the technical field of pit-type nitriding furnaces, the pit-type nitriding furnace comprises a furnace body structure, a support, a vacuum pump, a furnace cover structure, an opening and closing structure and a fan, steel for fasteners is subjected to nitriding treatment, the furnace body structure adopts dynamic sealing, and a dynamic adjusting structure is arranged, so that the service life of the furnace body structure is prolonged. The deformation degree of the furnace cover in a high-temperature environment can be sensed, the contact pressure of the sealing device and the position of the sealing ring can be automatically adjusted, the sealing gap change caused by thermal stress is effectively compensated, and the furnace cover structure can detect and block an air source in time when leakage occurs through a leakage blocking technology; a combustible mixed gas environment with the explosion risk is prevented from being formed, meanwhile, a controllable environment can be created for follow-up cooling, the situation that a large amount of gas continuously inflows and disturbs a normal cooling process is prevented, and when leakage is detected, cooling liquid can be rapidly sprayed, the temperature is rapidly reduced, and the explosion risk of a mixture of ammonia gas and air is eliminated; and the operation safety of the equipment is improved.

The present invention belongs to the technical field of stainless steel, and specifically relates to a high-strength and toughness stainless steel wire for ophthalmic surgical knives and a preparation method thereof. The content of the precious element Ni is reduced, and the contents of the elements Cu and Ca are increased. By adopting a production process of hot rolling, solid solution, cold rolling, annealing, cold drawing, annealing, cold drawing and low-temperature liquid nitrogen treatment, the stainless steel wire having a precipitated nano-scale copper-rich phase and a fibrous microstructure is produced. The resulting stainless steel wire has a yield strength of 1130 MPa or greater, a tensile strength of 1550 MPa or greater, and an elongation of 35% or greater, meeting the processing requirements of ophthalmic surgical knives.

The utility model discloses an industrial wastewater denitrification treatment device, and particularly relates to the technical field of industrial wastewater denitrification treatment, which comprises a mounting table, supporting legs are fixedly connected to the front and rear parts of the left side of the lower end of a horizontal part of the mounting table, and a treatment tank is fixedly connected to the left part of the upper end of the horizontal part of the mounting table; a flow blocking assembly is arranged in an inner cavity of the treatment tank; a stirring assembly is arranged in the middle of the inner cavity of the treatment tank; a spreading assembly is arranged at the upper part of the inner cavity of the treatment tank; and a secondary treatment assembly is arranged at the right part of the upper end of the horizontal part of the mounting table. According to the industrial wastewater denitrification treatment device disclosed by the utility model, the arranged flow blocking assembly plays a role in blocking the flowing of industrial wastewater, so that the flowing process of the industrial wastewater is slowed down, and the reaction time of the industrial wastewater and a medicament for industrial wastewater denitrification treatment is prolonged; the chemical can be used for more sufficiently decomposing the nitrides in the industrial wastewater.