77results about How to "Low oxygen" patented technology

The invention discloses a steel slag whole-process dry treatment process, and belongs to the technical field of steel slag treatment. Comprising the following steps: S1, a rolling procedure: carrying out rolling crushing on liquid steel slag, and in the process, cooling by adopting an air cooling mode to solidify the liquid steel slag; s2, a cooling procedure, wherein the steel slag obtained in the step S1 is cooled to 100 DEG C or below in a non-air-cooling mode; s3, a grinding procedure; s4, a sorting procedure; and S5, a waste heat recovery process, wherein heat released by the steel slag in the rolling process and the cooling process is recycled. The invention further discloses a steel slag whole-process dry processing system. Through reasonable design, gradient cooling is formed in the rolling procedure and the cooling procedure, meanwhile, heat released by steel slag in the two procedures is recycled, and the problem that the steel slag treatment waste heat recovery rate is low is solved.

The present invention discloses a mixed deoxidizer and its application in HDH, belonging to the technical field of inorganic deoxidizers. The components of the mixed deoxidizer are selected from at least three of borides, carbides, hydrides and titanium dichloride, and the deoxidation method is: the mixed deoxidizer and titanium hydride are mixed and kept at 400-850°C for 1-24h; the amount of the mixed deoxidizer does not exceed 0.1% of the mass of high-oxygen titanium hydride. The mixed deoxidizer of the present invention and its application method in HDH can solve the problems of high oxygen content of titanium hydride, powder agglomeration, poor mechanical properties of related molded products, etc., and improve the actual industrial application value of titanium hydride and its processed products.

The invention discloses a precipitation-supported slow-release carbon-based iron fertilizer and a preparation method thereof, and the preparation method specifically comprises the following steps: firstly, putting a biological carapace heavy metal adsorbent into a calcium hydroxide solution for dipping, drying, then putting the biological carapace heavy metal adsorbent into a ferrous sulfate solution for dipping in two times, and finally drying and granulating. Precipitated ferric hydroxide, a ferrous hydroxide mixture and excessive ferric sulfate are uniformly dispersed and attached to the interiors of pore channels of the porous adsorbent, and the excessive ferric sulfate can quickly provide iron ions for antagonistic cadmium and arsenic ion absorption in the early growth stage of rice. Precipitated ferric hydroxide and ferrous hydroxide wrapped by calcium sulfate in the porous adsorbent not only can realize long-acting slow release of iron ions, but also can reduce the oxygen content of soil, and iron ion antagonism and precipitation type adsorption loading modes are carried out in the whole growth process of rice, so that the release period of the iron ions is greatly prolonged, and the soil quality is improved. The iron fertilizer disclosed by the invention has an excellent rice cadmium-arsenic antagonism effect and has an excellent application prospect.

The invention discloses a precipitation-supported coated slow-release carbon-based iron fertilizer and a preparation method thereof.The preparation method specifically comprises the steps that a biological crustacean heavy metal adsorbent is soaked in a ferrous sulfate solution and then soaked in a calcium hydroxide solution again after low-temperature drying, finally, dried particles are granulated and subjected to coating treatment, and the coated slow-release carbon-based iron fertilizer is obtained. The coated slow-release iron fertilizer is loaded in a precipitation mode, a mixture of precipitated ferric hydroxide and ferrous hydroxide is uniformly dispersed and attached to the interiors of pore channels of the porous adsorbent, and the precipitated ferric hydroxide and the ferrous hydroxide are wrapped by a byproduct calcium sulfate in the porous adsorbent, so that long-acting slow release of iron ions can be realized; the rice cadmium arsenic antagonistic iron fertilizer has the advantages that the rice cadmium arsenic antagonistic effect can be achieved, the oxygen content of soil can be reduced, fine quantitative use of the coated iron fertilizer in the seedling raising period is matched, iron ion antagonism and a precipitation type adsorption load mode are carried out in the whole rice growth process, the iron ion release period is greatly prolonged, and the iron fertilizer has the excellent rice cadmium arsenic antagonism effect and has the excellent application prospect.

The invention relates to the technical field of data centers, and discloses a secondary side circulation pipe network and a data center liquid cooling system, the secondary side circulation pipe network comprises a circulation pipeline structure, a water quality monitoring system, a water quality purification system and a control system; the circulation pipeline structure is suitable for forming a circulation loop between the cooling capacity distribution unit and the liquid cooling cabinet; the water quality monitoring system is arranged on the circulating pipeline structure; the water quality purification system is arranged in parallel with the circulating pipeline structure and is used for diluting and purifying water in the circulating pipeline structure; the control system is connected with the water quality monitoring system and the water quality purification system and used for receiving water quality data transmitted by the water quality monitoring system and controlling connection and disconnection between the water quality purification system and the circulation pipeline structure according to the water quality data. According to the invention, real-time monitoring and data feedback of the water quality of the secondary side circulating pipe network are realized, and the ability of re-purifying and utilizing the deteriorated water quality and recovering good water quality is realized under the condition of no shutdown.

The application discloses a power plant multi-source waste heat collaborative recovery system and method based on slurry flashing, and relates to the technical field of energy saving of thermal power plants. The system comprises a flue gas waste heat recovery unit, a deaerator exhaust waste heat recovery unit and a continuous drainage waste heat recovery unit. The flue gas waste heat recovery unit comprises a flashing tank, a slurry inlet and outlet of the flashing tank are connected with a desulfurization tower, and a steam exhaust outlet of the flashing tank is connected with a steam collecting cylinder. The deaerator exhaust waste heat recovery unit comprises a deaerator, a deaerator steam exhaust heat exchanger and a condensate tank which are connected in sequence, and the condensate tank is connected with the flashing tank. The continuous drainage waste heat recovery unit comprises a continuous drainage flashing tank and a continuous drainage multi-stage flashing tank, and a steam exhaust outlet of the continuous drainage multi-stage flashing tank is connected with the steam collecting cylinder. The application collaboratively optimizes and recovers waste heat from different sources, effectively improves the recovery efficiency of waste heat, reduces the corrosion risk of equipment, and realizes full recovery of continuous drainage.

The application discloses a method for preparing biofuel by low-temperature dechlorination of waste PVC and coupling biomass co-pyrolysis, which comprises the following steps: drying, crushing and screening waste PVC, and then performing low-temperature dechlorination in an inert atmosphere, wherein the carrier gas is inert gas, the dechlorination temperature is 340-380 DEG C, the dechlorination time is 20-40 min, and dechlorinated PVC is obtained; crushing and drying the dechlorinated PVC, and then mixing the dechlorinated PVC with biomass at a mass ratio of 0.1-10:1, and then heating and pyrolyzing at 500-700 DEG C for 20-40 min to obtain biofuel. The method achieves good dechlorination effect through step-by-step pyrolysis, and improves the quality of biofuel; the method has a simple process flow, does not need to add any catalyst and adsorbent, and has a good industrial application prospect.

The invention relates to the technical field of non-ferrous metallurgy, and discloses a processing technology of an oxygen-free copper pipe for a magnetic control anode cylinder, which comprises the following steps: selecting a copper ingot with the copper content of 99.97%-100% as a raw material, putting the copper ingot into a vacuum electric furnace, heating and melting to form a copper liquid, extruding the smelted copper liquid into a copper pipe blank by using a pressurizing machine, and carrying out heat treatment on the copper pipe blank to obtain the oxygen-free copper pipe for the magnetic control anode cylinder. The method comprises the following steps: placing a copper pipe blank at an inlet of a two-roller Picker mill, carrying out primary rolling by using the two-roller Picker mill, carrying out annealing, solution treatment and aging treatment on the rolled copper pipe, cutting the copper pipe by adopting a chipless sawing technology according to requirements, cleaning the cut copper pipe, and bending the copper pipe by using a pipe bending machine according to the required bending degree, according to the method, the bent copper pipe is subjected to surface treatment of polishing and sand blasting, and whole-course intelligent online quality monitoring is implemented in the production process, including quality detection and regular sampling detection by an online detector, drying treatment by a drying oven, and size detection, mechanical property test and appearance inspection on the finished copper pipe.

This utility model relates to the field of detection device technology and discloses a detection device for a fire alarm, including a smoke storage box. A sealing cover is rotatably connected to the left side of the top of the smoke storage box. A support frame is fixedly installed at the top of the inner cavity of the smoke storage box. Magnets are fixedly installed at the right ends of both the sealing cover and the support frame. A steel wire rope is fixedly installed at the right end of the top of the sealing cover. By pulling the steel wire rope downwards, the sealing cover can be rotated upwards to open the top of the smoke storage box. The smoke storage box is then placed over the smoke alarm for detection. After detection, the steel wire rope is released. The compressed push spring, under its elastic force, moves the push rod upwards, pushing the extension block to rotate. This, in turn, causes the sealing cover to rotate in the opposite direction, sealing the smoke storage box and preventing smoke emission during movement. This reduces the use of smoke pellets and lowers detection costs.

The invention relates to the technical field of fly ash treatment, and discloses a household garbage incineration fly ash low-temperature pyrolysis device which comprises a temporary ash storage bin, a spiral feeder and a heat treatment concentration chamber, a spiral conveying pipe of the spiral feeder sequentially comprises a feeding section, a metering section and a control section, the feeding section is communicated with the temporary ash storage bin, and the metering section is communicated with the heat treatment concentration chamber. A rotating shaft is rotationally mounted in the spiral conveying pipe, and spiral blades are distributed on the rotating shaft; a bearing plate and a pressing plate slide up and down on the inner wall of the control section of the spiral conveying pipe, when the pressing plate moves downwards, the pressing plate extrudes fly ash in the control section, the pressing plate extrudes the bearing plate to move downwards, and a reset piece for driving the bearing plate to reset upwards is installed in the spiral conveying pipe; the control section is connected with a discharging pipe, when the bearing plate resets, the discharging pipe is stopped from communicating with the control section, and the control section is provided with a soot blowing pipeline used for allowing inert gas to enter. According to the method, the removal rate of dioxin in fly ash can be higher than 95%, and the subsequent resource utilization requirement is met.

The invention relates to a controllable low-oxygen silicon preparation method capable of reducing oxidation of silicon wafer cutting waste, and belongs to the technical field of silicon wafer cutting waste recovery and utilization. The method comprises the following steps: crushing and shaping silicon wafer cutting waste blocks to obtain silicon wafer cutting waste particles; then the silicon wafer cutting waste particles are evenly laid in a microwave heating furnace in a layered mode, the silicon wafer cutting waste particles on the adjacent horizontal layers are isolated through cloth in the vertical direction, and gaps are reserved between the adjacent silicon wafer cutting waste particles on the same horizontal layer; according to the initial water content, the initial oxygen content, the expected oxygen content, the device vacuum degree, the set temperature and the particle size, the preset time of microwave heating controllable dewatering and drying of the silicon wafer cutting waste particles is determined; under the vacuum condition, microwave heating can controllably dehydrate and dry to reduce the actual moisture content of the silicon wafer cutting waste and the actual oxygen content of the product, so that the controllable preparation of the low-oxygen silicon product is realized by reducing the oxidation of the silicon wafer cutting waste.

The utility model belongs to the field of flue gas denitration, especially is involved in a kind of denitration system for adding pure ammonia gas to high nitrogen oxide concentration flue gas. In order to realize emission reduction, the utility model provides a kind of denitration system for adding pure ammonia gas to high nitrogen oxide concentration flue gas, the denitration system includes flue, denitration reactor, flue gas on-line monitor, pure ammonia gas adding system for adding pure ammonia gas to flue and automatic control system;Pure ammonia gas adding system includes the ammonia supply line for conveying pure ammonia gas, flow regulating valve and ammonia gas flowmeter are equipped on ammonia supply line, the downstream end of ammonia supply line is equipped with pure ammonia nozzle located in flue and located in the downstream of flue gas on-line monitor;Automatic control system is used to control the opening of flow regulating valve according to the flow and nitrogen oxide concentration of original flue gas. Directly add pure ammonia gas to original flue gas, and dilute pure ammonia gas using original flue gas, thereby saving the energy consumed by dilution fan and reducing the amount of flue gas finally discharged.

The invention discloses a low-nitrogen burner and combustion method for producing hydrogen by high-temperature cracking of methanol. The burner comprises a combustion main cylinder, wherein a mixed gas chamber is connected with a combustion chamber; combustion-supporting air is passed through the mixed gas chamber; an expansion chamber is arranged in the mixed gas chamber, and the expansion chamber is connected with a vacuum generator exhaust port through a pipeline, and the vacuum generator air supply port is connected with a compressed combustion-supporting air supply source, and the negative pressure port of the vacuum generator is arranged at the flue gas outlet position; a plurality of U-shaped tubes are arranged in the methanol atomization annular chamber, and a methanol balancer is arranged at the left ends of the plurality of U-shaped tubes; a plurality of methanol high-temperature cracking tubes and a combustible gas annular tube are arranged in the combustion chamber; an atomizing methanol nozzle and an ignition device are arranged in the combustion chamber, and the atomizing methanol nozzle and the methanol balancer are connected with a methanol storage device through a transmission pipe. A low-nitrogen burner and combustion method for producing hydrogen by high-temperature cracking of methanol provided by the invention can reduce the generation of nitrogen oxides.

The utility model relates to the technical fields of ammonia fuel ship, specifically relates to a kind of ammonia fuel double ear can ship, including hull, deck, saddle and double ear fuel tank, deck is located at the top of hull, and hull and deck are enclosed into isolated cabin, saddle and double ear fuel tank are located in isolated cabin, saddle is fixed on hull, double ear fuel tank is installed on saddle, further include nitrogen generator, nitrogen generator inside has air compressor and drying unit, nitrogen generator is sent dry air to isolated cabin by dry air pipeline, isolated cabin side is connected with air supply pipeline, other side is connected with exhaust pipeline, dry air pipeline, air supply pipeline and exhaust pipeline are all provided with dew point sensor, nitrogen generator is arranged between air supply pipeline and exhaust pipeline, air supply pipeline and exhaust pipeline are all equipped with electrically-operated shut-off air valve. Dry air is sent to isolated cabin by dry air pipeline, effectively avoid the safety hazard caused by humid air into cabin to gas storage tank.

The invention discloses a dual-purpose filling valve, which relates to the field of filling valve structure, and in particular to a dual-purpose filling valve. A dual-purpose filling valve is proposed, which can be used for isobaric filling of carbonated beverages or beer, and can be used for hot filling of non-carbonated materials. It includes a valve body and a valve stem, and a liquid outlet channel is provided in the valve body; the dual-purpose filling valve also includes a back pressure chamber and a pressure relief reflux chamber; a return air channel is provided in the valve body, and the bottom of the return air channel is connected to the bottom of the valve body; the liquid outlet channel is connected to the pressure relief reflux chamber through a reflux valve, and the return air channel is connected to the pressure relief reflux chamber through a pressure relief valve, and the return air channel is also connected to the back pressure chamber through a back pressure valve. It can be used for isobaric filling of carbonated beverages or beer, and can be used for hot filling of non-carbonated materials, which significantly improves production efficiency. The material flows down in a columnar shape from the center of the container, which can effectively prevent the material from sticking to the surface of the can mouth sealing ring and polluting the mouth of the container.

The invention provides a real-time online treatment electroplating liquid recycling device and method.The device comprises an electroplating cavity, a flow guide pipe, a recycling cavity, a liquid sealing device, a pump body and a backflow pipe; a liquid outlet of the electroplating cavity is connected with a liquid inlet of the recycling cavity through a flow guide pipe, a liquid outlet of the recycling cavity is connected with a liquid inlet of the electroplating cavity through a backflow pipe, and the pump body and the liquid sealing device are arranged on the backflow pipe. The recycling cavity comprises a water removal device and an oxygen removal device, the water removal device is used for removing the water content exceeding a preset value in the electroplating liquid, and the oxygen removal device is used for removing oxygen in the electroplating liquid so that the oxygen content can be reduced to the ppm magnitude range. Oxygen and excessive water in the electroplating waste liquid are removed through the recycling cavity, the electroplating waste liquid is treated in time through the design of the flow guide pipe and the backflow pipe, and the treated electroplating waste liquid is input into the electroplating cavity in time, so that online recycling of the electroplating liquid is achieved, efficiency is greatly improved, stability of the electroplating liquid is maintained, and meanwhile, the production cost is reduced. The liquid sealing device is arranged on the return pipe, so that the electroplating liquid after deoxygenization operation is prevented from entering air again.

The present invention discloses a coal utilization system coupled with an ultra-low emission coal gasification-gas boiler, wherein the coal utilization system is mainly composed of a coal powder bin, a vertical strong vortex liquid slag removal gasifier, a slag pool, a desuperheater, a bubbling fluidized bed dry desulfurization desulfurization tower, a separation ash + desulfurization product bin, a high-temperature low-oxygen coal gas burner, a MILD gas boiler with an SNCR device, a high-temperature air duct, a high-temperature flue gas duct, a bag filter, an induced draft fan, a chimney and other equipment. The system uses high-temperature molten air gasification technology for coal gasification, and the generated hot coal gas is desulfurized by a pre-arranged bubbling fluidized bed desulfurization tower, and then MILD combustion and heat release are carried out in a MILD gas boiler with an SNCR device equipped with a high-temperature low-oxygen coal gas burner. The core of the present invention is to innovatively propose a coal utilization system coupled with a new type of pre-desulfurization ultra-low emission coal gasification-gas boiler that integrates multiple ultra-low emission advantage technologies, and the system has the advantages of low cost, low water consumption, and low pollution.

The invention provides a high-quality living system for residents in a high-altitude area based on cooperation of electricity, heat and oxygen. The high-quality living system comprises a main controller, a sealed heat preservation cabin, a photovoltaic module, a light storage all-in-one machine, a photovoltaic water electrode sensible heat and latent heat storage boiler and a gas supply unit. The sealed heat preservation cabin is embedded in the upper surface of the sealed heat preservation cabin; the light storage all-in-one machine comprises an energy storage battery and a sealed heat preservation cabin heat exchanger which are both arranged in a sealed heat preservation cabin. The air supply unit is arranged outside the sealed heat preservation cabin; the sealed heat-preservation cabin is mounted on the outer wall of the house and plays a heat-preservation role with the house; the photovoltaic water electrode sensible heat and latent heat storage boiler is arranged in a basement or a heat preservation cellar. The photovoltaic assembly is installed on a roof or the periphery of a house, the output end of the photovoltaic assembly penetrates through the sealed heat preservation cabin to be connected with the direct current input end of the light storage all-in-one machine and penetrates through a basement to be connected with a photovoltaic water electrode sensible heat and latent heat storage boiler power source low-frequency converter through cables, and energy is provided through photovoltaic power generation. The main controller is installed on the inner side wall of a user room in an embedded mode.

This invention discloses a method for preparing oxygen-free copper, relating to the field of metallurgical technology, comprising the following steps: Step S1, raw material pretreatment; Step S2, gradient melting and deoxidation; Step S3, gradient refining; Step S4, directional solidification casting; Step S5, heat treatment. The oxygen-free copper prepared by this method exhibits good mechanical properties, excellent electrical conductivity and heat resistance, and low oxygen content.

A method for preparing nickel powder through electrolysis of nickel sulfate waste liquid in one step comprises the steps that the nickel sulfate waste liquid is diluted to a certain concentration by controlling the reduction degree of Ni < 2 + > under different cathode conditions, and different nickel electrolysis products are selectively prepared in the diluent; ti plated TaO2 / I rO2 alloy is used as an anode, a Ti sheet is used as a cathode, electrolysis is carried out under the conditions that the current density is 30-2000A / m < 2 >, the electrolyte temperature is 20-60 DEG C and the nickel ion concentration is 0.025-1.0 mo l / L, and nickel powder is obtained through electrodeposition on the cathode after electrolysis is finished; a circulating pump is used for recycling waste liquid; the electrolytic nickel powder prepared through the method is simple in required equipment, short in technological process, mild in condition, low in production cost, high in efficiency, environmentally friendly, suitable for one-step preparation of the nickel powder through the high-impurity nickel sulfate waste liquid and suitable for one-step preparation of the electrolytic nickel powder through the pure nickel sulfate solution. The method is especially suitable for environmental protection enterprises of nickel-containing waste liquid.

A movable tunnel kiln with a flue gas re-burning system comprises a main body and a flue gas system, the main body comprises a drying section, a preheating section, a roasting section and a cooling section which are sequentially connected, and the flue gas system comprises a flue unit, a moisture removal unit and a desulfurizing tower. The flue gas system further comprises a flue gas re-burning unit, the flue gas re-burning unit comprises a flue gas re-burning main pipeline, a second fan, a smoke suction assembly and a smoke exhaust assembly, the second fan is communicated with the front portion and the rear portion of the flue gas re-burning main pipeline, and the front portion of the flue gas re-burning main pipeline is communicated with the smoke suction assembly. The method has the beneficial effects that firstly, the environment-friendly characteristic is improved; secondly, the emission reduction characteristic is improved; and thirdly, the energy consumption is reduced.

The utility model discloses a biological culture medium dry powder mixing device, which belongs to the technical field of dry powder mixing devices and comprises a frame body and a mixing tank arranged at the upper end of the frame body, a top cover is arranged at the upper end of the mixing tank, a mixing component is arranged on one side of the top cover, and a solvent injection structure is further arranged at the upper end of the top cover. Dry powder particles can be screened through the electric vibrating screen, so that the dry powder particles can fall down from pores in the surface of the electric vibrating screen, the dry powder particles are uniformly dispersed, caking can be effectively avoided, meanwhile, the water pump is started, and the dry powder particles are uniformly dispersed. The solvent in the box body can be pumped into the mixing tank through the guide pipe, then the motor is started, the shaft rod can be driven to rotate, the stirring rod and the scraping plate can mix dry powder, it is ensured that the solvent and the dry powder are fully mixed, the mixing effect is good, and caking is reduced.

The application discloses a solid mixed feed additive production line, which comprises a total distribution box, a screening machine, a premixing machine, a total mixing machine, a bottle sorting machine, a filling machine, a cap screwing machine, an aluminum foil sealing machine, a labeling machine, a boxing machine and a first conveying belt electrically connected with the total distribution box; the screening machine, the premixing machine and the total mixing machine are sequentially arranged, the filling machine, the cap screwing machine, the aluminum foil sealing machine, the labeling machine and the boxing machine are sequentially connected through the first conveying belt, the total mixing machine is arranged above the filling machine and connected with the filling machine through a first feeding spiral; the production line realizes a series of automatic production of solid feed from raw materials to finished product stacking, reduces the residence time of products in production, obviously reduces the influence of production links on products, improves the production efficiency; the closed structure between equipment effectively reduces the dust generated by materials, and avoids the influence of external environment on the feed quality; the product has low oxygen content, good sealing performance and high stability.

The invention provides a silicon nitride substrate with ultrahigh thermal conductivity and a preparation method thereof.The preparation method comprises the steps that superfine high-purity silicon nitride powder is adopted and sequentially subjected to isostatic cool pressing, first hot pressing sintering, cutting, second hot pressing sintering and slicing, and the silicon nitride substrate with the ultrahigh thermal conductivity is obtained. The density of the silicon nitride substrate is better and is closer to the theoretical density of silicon nitride, the heat-conducting property and mechanical property of the silicon nitride substrate are further ensured, and the heat conductivity of the silicon nitride substrate is larger than or equal to 100 W / (m.K).

The present invention discloses an aluminum powder material for N-type silver aluminum paste, wherein the median diameter D50 of the aluminum powder material is 1-3 μm, and the maximum particle D100 is less than 4.5 μm. The present invention can reduce the silver aluminum pinning pits formed while not affecting the formation of good ohmic contact of the silver aluminum paste on the front of the N-type battery during the metallization process, thereby reducing metallization recombination, increasing the open circuit voltage of the battery, and improving the photoelectric conversion efficiency.

The utility model relates to the technical field of solar photovoltaics, in particular to a thermal field structure of a single crystal furnace, which comprises a heat preservation component, the heat preservation component is formed by sequentially overlapping an upper barrel, a middle barrel and a lower barrel from top to bottom, and a crucible and a heater are arranged in the heat preservation component. Each of the upper barrel, the middle barrel and the lower barrel comprises an inner-layer heat-insulating barrel, an outer-layer heat-insulating barrel, an upper cover plate, a lower cover plate and a heat-insulating layer completely filled between the inner-layer heat-insulating barrel and the outer-layer heat-insulating barrel, the tops of the inner-layer heat-insulating barrel and the outer-layer heat-insulating barrel are respectively clamped with two ends of the upper cover plate, and the bottoms of the inner-layer heat-insulating barrel and the outer-layer heat-insulating barrel are respectively clamped with two ends of the lower cover plate; the upper barrel, the middle barrel and the lower barrel are sequentially connected in a clamped mode, and the heat preservation layer comprises an inner heat preservation layer, a middle heat preservation layer and an outer heat preservation layer which are sequentially arranged from inside to outside. The heat preservation effect is improved through the three heat preservation layers, the heat radiation mode, the sequential clamping connection of the upper barrel, the middle barrel and the lower barrel and the carbon-carbon composite material heat preservation barrel, the replacement frequency of the heat preservation layers is reduced, installation is convenient, and the cost is effectively reduced.

The utility model relates to rare earth hydrogen storage alloy or quick -setting neodymium iron boron alloy smelting auxiliary equipment technical field, specific, relate to a kind of rare earth metal powder explosion -proof dust collecting device, including shell, filter bag chamber, backflush mechanism, dust-containing gas inlet, purified gas outlet, still include inert gas supply gas path, explosion suppressor, explosion vent. Nitrogen gas path is introduced on the one hand reduces the oxygen content in dust collecting device, makes oxygen concentration reduce, reduces the oxidation reaction of rare earth metal, reduces the generation of heat. On the other hand, nitrogen in nitrogen gas path low pressure gas path is obtained by high-pressure liquid nitrogen throttling pressure reduction, temperature is lower, it is favorable to reduce the temperature in dust collecting device. The introduction of nitrogen gas path greatly reduces the explosion risk, this is the conventional working process. By introducing explosion suppressor, explosion vent, cooling can be carried out when temperature is too high and pressure relief after explosion, to slow down the progress of explosion and protect the entire device after explosion.

The invention relates to the field of air condensing devices, in particular to an air condensing system and an anti-freezing and anti-rust method based on the system. The system comprises at least two columns of air coolers; the inflating unit is used for inflating shielding gas into the cut air coolers; the inflation unit comprises a gas source for providing protective gas; the air source comprises a plurality of air outlet ends; each air outlet end is provided with a first valve for controlling the opening and closing of the air outlet end; the steam extraction unit comprises a steam extractor, and the steam extractor is provided with a main extraction opening and an extraction opening; the main extraction opening is provided with a plurality of main extraction steam extraction ends communicating with the air coolers in a one-to-one correspondence mode. Each main extraction steam extraction end is provided with a second valve for controlling the on-off of the main extraction steam extraction end; the extraction opening comprises a plurality of extraction steam extraction ends which are communicated with the air coolers in a one-to-one correspondence manner; each extraction steam extraction end is provided with a third valve for controlling the on-off of the extraction steam extraction end; the anti-freezing and anti-rust paint is beneficial to freezing prevention and rust prevention during operation in winter.

The invention provides an assembly type anti-explosion firework and cracker storage bin. The fireworks are made of polyethylene, the overall mass can be greatly reduced through the arrangement of the water cavity, so that the effects of being convenient to assemble and carry are achieved, and during day and night replacement, the polyethylene can effectively avoid the problems that hot air is pre-cooled and liquefied into water drops, and fireworks explode and are affected with damp; after assembly is completed, the inner space is pumped into the low-pressure storage space through the vacuumizer, due to the fact that air in the low-pressure storage space is thin and contains little water vapor, damp of the fireworks and crackers can be further reduced, the combustion conditions of the fireworks and crackers can also be destroyed, due to the fact that the air is thin and the oxygen content is little, the stacked fireworks and crackers are not prone to exploding, and the fireworks and crackers are not prone to exploding. And meanwhile, municipal tap water is connected to the water injection valve, tap water is injected into the water cavity, the fireworks stacked in the low-pressure storage space are made to explode in the low-temperature environment all the time, and the situation that the fireworks and crackers explode due to the too high temperature can be avoided.

The invention belongs to the technical field of nitrogen making equipment, and particularly relates to a nitrogen making machine for a handheld laser welding machine, which comprises a nitrogen making case, the nitrogen making case comprises a protective shell, the back of the inner cavity of the protective shell is fixedly connected with a control panel, and the bottom of the protective shell is provided with a movable base. Side protection plates are symmetrically arranged on the two sides of the outer surface of the protection shell, and a nitrogen generator is arranged at the bottom of the inner wall of the protection shell. Due to the fact that nitrogen is sprayed out through a gas spraying end, a large amount of nitrogen is prone to being accumulated at a rubber pipe sleeve connected with the gas spraying end due to the fact that nitrogen is not discharged in time, the connecting position of a pipe body is prone to being exploded due to high pressure, and then the problem of nitrogen leakage is solved. And the connecting through disc at the bottom can be automatically opened for pressure relief work, and the problem that the pipe body connecting position is in a high-pressure state all the time and then bursts due to exceeding the load is solved.