48results about How to "Improve water balance" patented technology

The invention discloses an organosilicon foliage fertilizer and making method, which is the leach of charred rice husk with water without polluting and side effect, wherein the foliage fertilizer is made of nitrogen, phosphine, potassium fertilizer, trace fertilizer, humic acid, plant growth modifier dissolved in the water with organosilicon fertilizer. The invention reaches effective utility due to kinds of nutritious element adsorbed by plant, which improves the crop production for forage crop, bean culture, vegetable and fruit tree.

The invention discloses a method for producing phosphoric acid by a hemihydrate technique, belonging to the field of phosphoric acid production by a wet process. The invention aims to provide a method for producing phosphoric acid by a hemihydrate technique, which can enhance the phosphorus yield. The method comprises the following steps: a. pre-reaction: controlling sulfuric acid in a return slurry of a crystallization tank and CaO added into ground phosphorite in a mol ratio of (0.4-0.6):1; b. entering a decomposing tank for further reaction; c. entering the crystallization tank to react with a solution formed by thoroughly mixing a phosphoric acid solution and sulfuric acid to form crystals, and controlling the mass ratio of the sulfate group in the slurry acid liquor to the acid liquor at 1.5-2.0%; d. entering a grain growing tank to promote crystal growth; and e. filtering to obtain the finished phosphoric acid product. The method disclosed by the invention has the advantage of more optimized and reasonable process, is simpler and more stable to operate and control, and can obtain high phosphorus yield.

The invention belongs to the field of urea preparation, and particularly relates to an energy-saving urea production system and a production process thereof. The system comprises a CO2 compressor, an ammonium carbamate pump, a liquid ammonia pump and a urea synthesizer. The system is characterized in that the CO2 compressor is connected with the ammonium carbamate pump and the liquid ammonia pump, the liquid ammonia pump is connected with the urea synthesizer, a falling-film countercurrent medium-pressure decomposing tower and a heater, an ammonium carbamate condenser, an ammonium carbamate separator, a three-stage medium-pressure absorption tower and an evaporative ammonia refrigeration recoverer, a liquid ammonia buffer tank, an inert gas scrubber, a tail-gas ammonia cleaning fine purifier, a low-pressure decomposing tower and a heater, a dimethyl liquid preheater, a horizontal low-pressure absorber, a falling film type pre-evaporator, a one-stage evaporator and a one-stage evaporative condenser, a two-stage evaporator and a two-stage evaporative condenser, and a process wastewater desorption and hydrolysis tower are sequentially connected behind the urea synthesizer in sequence. The energy-saving urea production system has the advantages of low investment, low energy consumption, simple operation, high elasticity and the like, thereby the process technology has considerable economic benefit and social benefit.

A method and apparatus for improving the water balance in the power unit by providing the exhaust gas from the cathode side of the PEM fuel cell as a feed gas to the combustion system of the steam reforming system, condensing at least a portion of water present in the effluent from the combustion system in a condenser, and then transferring water vapor from the uncondensed portion of the effluent from the condenser to the gas fed to the cathode side of the PEM fuel cell. Water from the exhaust gas from the cathode side of the PEM fuel cell is either captured in the condenser, or is reused in the feed gas of the cathode side of the PEM fuel cell. By humidifying the air fed into system with the water vapor present in the exhaust gas, water is not lost from the system. Instead, the air is being fed into the system is humidified with this water, which in turn allows the humidifier to operated at higher temperatures and / or use smaller radiators and fans and / or draw less parasitic power, thereby increasing overall system efficiency.

A method for recovering lithium from sodium sulfate as a lithium extraction by-product of a spodumene sulfuric acid process is characterized by including: uniformly mixing the lithium-containing sodium sulfate as the lithium extraction by-product with pulverized coal, and roasting in an oxygen-isolated condition to obtain roasted material; extracting the roasted material by water, and filtering toobtain a filter residue and filter liquid; adopting dilute sulfuric acid to extract the lithium in the filter residue, and performing solid-liquid separation to obtain a lithium sulfate solution anda solid residue; subjecting the filter liquid to evaporation, concentration and crystallization, and when a solid is separated out, performing solid-liquid separation to obtain a solid product and a first mother liquid; introducing carbon dioxide into the first mother liquid according to lithium content, and performing solid-liquid separation to obtain secondary mother liquid and lithium carbonate. The method for recovering the lithium from the sodium sulfate as the lithium extraction by-product of the spodumene sulfuric acid process solves the problem that the lithium in the lithium-containing sodium sulfate as the lithium extraction is difficult to recover formerly, and has the advantages that lithium recovering rate can be over 95%, the low-value lithium-containing sodium sulfate as thelithium extraction by-product can be turned into high-value sodium sulfide, iron content in the sodium sulfide is less than 0.0010%, and impurity content in the sodium sulfide is much lower.

The invention discloses a silver floatation production process method for zinc hydrometallurgy acid leaching pulp. A direct silver floatation production process method for zinc hydrometallurgy acid leaching pulp is adopted, and comprises the following steps: preparing ore to be floated into zinc acid leaching pulp, and directly floating the zinc acid leaching pulp; floating to produce silver concentrate and tailings. The step for preparing ore to be floated into zinc acid leaching pulp, and directly floating the zinc acid leaching pulp comprises the following specific steps: performing acid leaching on calcined sand obtained by boiling and calcining zinc concentrate powder with an all-known zinc hydrometallurgy process to obtain acid leaking pulp; feeding the acid leaking pulp into a stirring tank for size mixing by adopting an all-known floatation technology, adding a size mixing floatation agent in the size mixing process, feeding the pulp into a floatation tank for floating after size mixing, adding a floatation agent in a floating process to produce silver concentrate and tailing pulp, and performing filter pressing and waste washing by adopting an all-known zinc hydrometallurgy process to prepare electrolyte.

Alkali metal chlorite, particularly sodium chlorite, is produced with a low carbonate level by combining a chlorine dioxide generating system operating at subatmospheric pressure with a chlorite formation reactor in which the chlorine dioxide reacts with hydrogen peroxide in the presence of aqueous alkali metal hydroxide, particularly sodium hydroxide.

A method and apparatus for improving the water balance in a power unit by providing the exhaust gas from the cathode side of the fuel cell as a feed gas to the combustion system condensing at least a portion of water present in the effluent from the combustion system in a condenser, and then transferring water vapor from the uncondensed portion of the effluent from the condenser to the gas fed to the cathode side of the fuel cell. Water from the exhaust gas from the cathode side of the fuel cell is either captured in the condenser, or is reused in the feed gas of the cathode side of the fuel cell. By humidifying the air fed into system with the water vapor present in the exhaust gas, water is not lost from the system. Instead, the air is being fed into the system is humidified with this water, which in turn allows the humidifier to operated at higher temperatures and / or use smaller radiators and fans and / or draw less parasitic power, thereby increasing overall system efficiency.

The present invention discloses a chelate resin tower regeneration prolongation process method comprising the following steps: step 1, first crude saline is added with high purity phosphoric acid for precipitation processing; step 2, the processed first crude saline is filtered; and step 3, the filtrate after filtering in the step2 is introduced into a chelate resin tower for adsorption. The chelate resin tower regeneration prolongation process method well solves the problem of frequent regeneration of the chelate resin tower, greatly extends the resin tower regeneration cycle, reduces labor intensity, saves material and power required for regeneration, reduces waste water efflux, and reduces the amount of wastewater reused in the saline process to achieve the increase in the amount of brine dosage.

The invention discloses a stevia two-section floating plate cutting seedling culture method. Floating plates are used for stevia cutting seedling culture; one floating plate seedling culture plate water pool is arranged in the tree shade, and the other floating plate seedling culture plate water pool is arranged in the sunshine; firstly, the stem sections of the stevia are cut in the floating seedling culture plate in the tree shade; after the rooting and survival, the stem sections and the floating plate are jointly transferred into a sunshine water pool for culture and seedling strengthening. The seedling culture method has the advantages that the cutting survival rate can be improved; the strengthening seedling can be cultured; meanwhile, the seedling culture management work quantity can be reduced; the work efficiency is improved.

The invention provides a sponge city green roof facilitating accomplishment of emission reduction and purification of rainwater for the roof surface. The sponge city green roof facilitating the accomplishment of the emission reduction and the purification of the rainwater for the roof surface comprises layered rainwater collecting grooves, a roof greening layer and a roof water storage tank; the roof greening layer is arranged on a roof body; the layered rainwater collecting grooves are fixedly formed in the upper side of the roof greening layer in a supporting mode through supporting rods; confluence grooves are fixedly formed in the end heads of the lower sides of the layered rainwater collecting grooves; a rainwater collection ditch is formed in one side of two sides of the roof greening layer, and the upper side of the rainwater collection ditch is covered with a greening layer rainwater collecting filter net; the roof water storage tank is arranged on the adjacent side of the roofgreening layer; and eave confluence grooves are connected to the upper side of the roof water storage tank in a supporting mode through water pipes. According to the sponge city green roof facilitating the accomplishment of the emission reduction and the purification of the rainwater for the roof surface, a rainwater collecting eave is designed in an arc-shaped structure, arc-shaped grooves are equidistantly formed in the top surface of the rainwater collecting eave in an arrangement mode, and the collection of rainwater by the arc-shaped grooves rapidly enabling the rainwater to be collectedand flow into the eave confluence grooves is facilitated.

Disclosed herein is a piston for an airless-type cosmetic container. The piston disposed in the container is moved upwards by operation of an airless pump to discharge contents, and a silicone packing part is integrated with a piston main body along a periphery thereof using an insert molding method, thus improving productivity. In addition, instead of direct contact between the container and the piston, the silicone packing part surrounding the piston uniformly comes into close contact with the container, thus ensuring superior sealability between the piston and the container, regardless of the shape of the piston, thereby preventing the leakage of the contents and efficiently discharging the contents. Moreover, unlike typical cosmetic containers, the container can be implemented in various shapes, thereby maximizing marketability.

The invention relates to a high-altitude environment adaptability adjusting device for an air-cooled fuel cell. The device comprises a gas pressurization power source, an air injection duct, an adjusting device and a detection device. The gas pressurization power source is located at an air inlet of the air duct; the air-cooled fuel cell stack is located in the middle section of the air duct; theperiphery of the air-cooled fuel cell stack is connected with the air duct in a sealed mode; all air in the air duct flows through a cathode flow channel of the air-cooled fuel cell stack; and the adjusting device and the detection device are arranged in the air duct. The working pressure of cathode air of the air-cooled fuel cell is increased through a turbocharging fan, so that the oxygen supplyconcentration and temperature of the cathode are increased. Through the temperature and humidity adjusting device, the temperature and humidity characteristics of supplied air are further improved, the galvanic pile can reliably work at the high altitude of 5000 to 10000 meters, and the application space of an electric unmanned aerial vehicle is greatly expanded.

The invention belongs to the field of urea preparation, and particularly relates to an energy-saving urea production system and a production process thereof. The system comprises a CO2 compressor, an ammonium carbamate pump, a liquid ammonia pump and a urea synthesizer. The system is characterized in that the CO2 compressor is connected with the ammonium carbamate pump and the liquid ammonia pump, the liquid ammonia pump is connected with the urea synthesizer, a falling-film countercurrent medium-pressure decomposing tower and a heater, an ammonium carbamate condenser, an ammonium carbamate separator, a three-stage medium-pressure absorption tower and an evaporative ammonia refrigeration recoverer, a liquid ammonia buffer tank, an inert gas scrubber, a tail-gas ammonia cleaning fine purifier, a low-pressure decomposing tower and a heater, a dimethyl liquid preheater, a horizontal low-pressure absorber, a falling film type pre-evaporator, a one-stage evaporator and a one-stage evaporative condenser, a two-stage evaporator and a two-stage evaporative condenser, and a process wastewater desorption and hydrolysis tower are sequentially connected behind the urea synthesizer in sequence. The energy-saving urea production system has the advantages of low investment, low energy consumption, simple operation, high elasticity and the like, thereby the process technology has considerable economic benefit and social benefit.

The invention relates to a device for preventing crystallization blockage of an ammonia desulfurization tower. The bottom of the desulfurization tower is an absorption liquid section, and a condensation section, an absorption section, a water washing demisting section and a demister section are arranged above the absorption liquid section sequentially; a closed in-tower baffle plate is arranged between the absorption liquid section and the condensation section, a concentration gas rising plate is arranged between the condensation section and the absorption section, a water washing section gasrising plate is arranged between the absorption section and the water washing demisting section, and water washing demisting section filler and a water washing section spraying layer are arranged in the water washing demisting section; a demister for flushing spraying is arranged in the demister section, crystallization can be avoided on the spraying layer structure, accumulation of desulfurized ammonium salt evaporation crystals in the condensation section is reduced, and therefore, crystallization and material hanging at the position of the gas rising plates can be prevented, flue gas circulation is increased, crystallization and material hanging at the position of the gas rising plates are mainly prevented, crystals and hung materials are removed, cavity circulation of the gas rising plate is increased, running resistance in the tower is reduced by about 50 Pa, water balance of an absorption liquid system is improved, and the utilization rate of a circulating liquid is greatly increased and is increased by 90% or higher.

The invention discloses a crude red mud filtrating and washing process, which consists of loading crude red mud slip from the red mud grading procedure into horizontal band filters or flat disc type filters for filtrating and washing, wherein the distribution head on the filters divides the whole filter into a separation zone and a washing zone, loading the crude liquor obtained in the seperation zone into a desiliconisation procedure, entering the filter cakes of seperaton area into the washing zone, proceed reversal washing for two to three times, loading the washed red mud cleaning solution to a dissolving procedure, loading the washed crude red mud to sponge iron plant for reclamation of iron.

The invention discloses a whitening and freckle-removing cosmetic containing negundo chastetree fruit stem cells. The whitening and freckle-removing cosmetic mainly consists of the following components in percentages by weight: 5% to 30% of negundo chastetree fruit stem cells, 2% to 15% of a ginseng extracting solution, 2% to 15% of a prepared rehmannia root extracting solution and 2% to 15% of a lemon extracting solution. The negundo chastetree fruit stem cells are selected and used as a main raw material, the cells are activated, free radicals are scavenged, the generation of chloasma and butterfly rash is blocked, skin melanin is eliminated, whelk is reduced and removed, the skin is white and beautified, the negundo chastetree fruit stem cells are of high compatibility with human bodies and are more easily absorbed by the human bodies, the cosmetic has a good promotion effect for the growth of skin cells, the metabolism of the cells can be quickened, the activity of skin cells is strengthened, and moreover, the prepared radix rehmanniae extract, the ginseng extract and the lemon extract with the effects of whitening and activating skin, promoting metabolism and strengthening skin cell activity are added, and generate a synergistic effect with the negundo chastetree fruit stem cells, so that the skin type can be obviously improved, the skin generation capacity is improved, and the whitening and freckle-removing effects are obvious.

The invention relates to a method for retaining green of south grape stalks. In the traditional freshness retaining method, the stress is mainly laid on the freshness retaining treatment on a grape fruit and the protection on stalks is ignored. The method provided by the invention comprises the following steps of: firstly, mixing sodium tripolyphosphate and sodium pyrophosphate to form composite phosphate and then preparing into a composite phosphate aqueous solution A; secondly, dissolving 6-benzyladenine (6-BA) into 70 percent ethanol to form a solution B; thirdly, mixing the solution B into the solution A to obtain a stalk green retaining preparation; and finally, immediately dipping the pruning wounds of the harvested grapes with the green retaining preparation for ten seconds, and after drying in the air, placing into the low-temperature environment. The composite phosphate in the invention can improve the water retaining capability of the fresh and tender plant tissues so that the plant tissues can still maintain water therein in the refrigerating process; and 6-BA can improve the water balance condition in the tissues so as to delay the wilting of the grape stalks due to water loss through the synergistic effect with the composite phosphate.

The invention discloses a device for realizing zero emission of desulfurization wastewater and coupled cooperative control of white smoke plume. The device comprises a deduster, an induced draft fan and a gas-liquid phase change coupled heat exchanger sequentially and connectedly arranged on a flue according to a direction from far to near to a desulfurization tower inlet, a desulfurization wastewater outlet of a desulfurization tower is connected with a settling tank, an outlet of the settling tank is connected with a clear water tank, an outlet of the clear water tank is connected to a liquid inlet of the gas-liquid phase change coupled heat exchanger through a pipeline, a circulating pump is arranged on the pipeline, a liquid outlet of the gas-liquid phase change coupled heat exchangeris connected with a concentrated liquid inlet of a concentrated liquid tank, a concentrated liquid outlet of the concentrated liquid tank is connected with a flash tank through a pipeline, and a flashgas outlet of the flash tank and a high-temperature gas inlet of the flash tank are connected to the flue in front of a deduster inlet through pipelines respectively. The device organically combineszero-emission of the wastewater with control of the white smoke plume of flue gas, thereby synchronously realizing the objective of pollutant treatment and control.

The invention provides a thermal power plant water balance testing method and device. The method comprises the steps that water balance physical quantity initial parameters such as water supply, water drainage, water consumption, unit parameters and production environment parameters of all subsystems obtained in advance are input into an intelligent water balance management system; the intelligent water balance management system carries out data processing on a water balance physical quantity according to a set model; after data processing, water balance physical quantity statistical parameters such as water consumption and water drainage of each subsystem and the whole plant and a water balance statistical report are automatically generated; and the water balance physical quantity statistical parameters is compared with standard water balance physical quantity statistical parameters or empirical values of units of the same type to obtain the water consumption level grade of the whole plant in a certain production period of the power plant, and optimization suggestions is generated for improving the water consumption level grade.

The invention relates to the technical field of plant cultivation, in particular to a cunninghamia lanceolata tissue culture seedling transplanting matrix and a preparation method thereof. The transplanting matrix comprises the following components in parts by volume: 1-3 parts of fermented bark, 2-3 parts of fermented wood bran, 4-5 parts of foamed coconut bran and 0.5-1 part of yellow soil. According to the invention, by taking the bark, the wood bran and the coconut bran as main materials, and the yellow soil as an auxiliary material, the cunninghamia lanceolata tissue culture seedling transplanting matrix is prepared, so that the content of the organic matters in the bark is high, the antibacterial property and the stress resistance are achieved, and the content of organic matters in the bark is high, including cellulose, hemicellulose, lignin, or other microelement; the carbon-nitrogen ratio of the wood bran is high, and the air permeability and the water-retaining property are good, the coconut bran is loose in texture, natural decomposition is slow, and the service life of the matrix can be prolonged, the texture of the yellow soil is compact, the loss of moisture and nutrients can be effectively prevented, and the prepared matrix is very suitable for transplanting cunninghamia lanceolata tissue culture seedlings.

The invention relates to a chlorination leaching method of laterite sulfurized precipitate. Chlorination leaching is utilized to obtain the metallic-nickel-enriched turnover liquid which can directly enter the nickel production system. The technological process comprises the following steps: (1) mixing the laterite sulfurized precipitate and water in a mass ratio of (2-6):1, and introducing chlorine gas of which the pressure is 0.1-0.5Mpa; and (2) control of leaching of chlorine gas: the liquid-to-solid ratio is controlled at (2-6):1, the leaching temperature is 70-80 DEG C, the leaching potential is 450-480mv, the leaching time is 2-4 hours, and the leaching stock solution is a copper-bearing 30-50 g / L water solution. The invention obtains a nickel-cobalt sulphate solution of which the nickel content is greater than 90%: more than 90% of nickel and cobalt in the laterite sulfurized precipitate are leached and enter the solution, and valuable metals in the residues are comprehensively recycled, thereby promoting the recycling of waste ores.

The invention discloses an ore grinding device including a closed circuit device; the closed circuit device is connected with a two-level dehydrating device; the two-level dehydrating device comprises a filter, a belt machine and a repulp tank; the filter is connected with one end of the belt machine and is provided with a water pump, and the water pump is connected with a water inlet pipeline of a grinding port of a grinding machine in the closed circuit device; a pulp inlet of the repulp tank is connected with the other end of the belt conveyor, and the repulp tank is provided with a water inlet pipeline; with the use of the device, the yield of phosphoric acid can be improved, the qualified rate of the ore pulp is guaranteed, the consumption is reduced, and the benefit is increased; with the addition of the dehydrating device, the sewage digestion ability in production can be increased, energy is saved, emission is reduced, and water balance for production of phosphoric acid is quite facilitated.

The invention belongs to the technical field of tree cultivation, and discloses a transplanting cultivation method for Pu'er old tea trees. The method mainly comprises the following steps: tree selection and pruning: selecting Pu'er old tea trees in winter and spring, and pruning the selected Pu'er old tea trees to be transplanted; excavation and transportation: excavating the Pu'er old tea trees,retaining soil balls in the excavation process, and then transporting the Pu'er old tea trees to a transplanting place; planting: pruning roots of the Pu'er old tea trees, spraying a rooting solutionand a sterilizing solution, and then planting the Pu'er old tea trees; and cultivation: brushing a trunk and a cut with a paraffin solution, and then watering the Pu'er old tea trees. The method provided by the invention is simple to operate, good in effect and good in sealing performance for tree bodies, water of the tree bodies does not evaporate, water transpiration and loss are reduced, it isensured that the tree bodies do not dehydrate, the trunk does not rot, the trunk and bark are not damaged, water balance and physiological balance of the tree bodies are maintained to the maximum extent, rapid rooting of the tea trees is achieved, and the survival rate of the transplanted tea trees is improved by 95% or above.

The invention discloses a method for optimizing the trend of membrane concentration ultrafiltration cross-flow concentrated water, which comprises the following step: S1, changing original three setsof membrane concentration ultrafiltration concentrated water outlet points into a large multi-medium backwashing water tank, leading originally designed membrane concentration ultrafiltration concentrated water pipelines from three sets of ultrafiltration concentrated water valves to meet at a pipe gallery, gathering the water in the pipelines to a main pipeline, and discharging the water into a strong brine adjusting tank. The invention relates to the technical field of ultrafiltration cross-flow concentrated water treatment. According to the method for optimizing the trend of membrane concentration ultrafiltration cross-flow concentrated water, a large amount of ultrafiltration concentrated water is originally designed through a membrane concentration device to enter the strong brine adjusting tank, be lifted, be treated by large high-density equipment and then enter a subsequent working section, repeated tests prove that the ultrafiltration concentrated water is filtered water withturbidity, hardness and large-particle suspended solids degraded by a high-density sedimentation tank and a multi-medium filter, can completely cross over large high-density and directly enters the multi-medium backwashing water tank, so that the operation load and the medicament consumption of large high-density equipment are reduced, and the operation cost is reduced.

A method and apparatus for improving the water balance in a power unit by providing the exhaust gas from the cathode side of the fuel cell as a feed gas to the combustion system condensing at least a portion of water present in the effluent from the combustion system in a condenser, and then transferring water vapor from the uncondensed portion of the effluent from the condenser to the gas fed to the cathode side of the fuel cell. Water from the exhaust gas from the cathode side of the fuel cell is either captured in the condenser, or is reused in the feed gas of the cathode side of the fuel cell. By humidifying the air fed into system with the water vapor present in the exhaust gas, water is not lost from the system. Instead, the air is being fed into the system is humidified with this water, which in turn allows the humidifier to operated at higher temperatures and / or use smaller radiators and fans and / or draw less parasitic power, thereby increasing overall system efficiency.

There is provided a fuel cell system which can prevent the drying of a proton exchange membrane and prevent the generation of liquid droplets at a hydrogen tank surface which blocks the supply of air, at the same time, and which includes a hydrogen tank, a fuel cell stack disposed such that a first air hole thereof faces the hydrogen tank and a second air hole thereof is open to the atmosphere, and a water holding member provided on a surface of the hydrogen tank facing the first air hole of the fuel cell stack, for collecting and holding water generated in the fuel cell stack.

The invention discloses a whitening skincare product. The whitening skincare product is prepared from components in parts by weight as follows: 2-8 parts of a fructus lycii stem cell extract, 5-15 parts of a radix ginseng extract, 5-10 parts of a rhizoma coptidis extract and 3-10 parts of an impatiens balsamina extract. Fructus lycii stem cells have good compatibility with a human body, are more easily absorbed by the human body, have good promoting effect on skin cell growth and can accelerate metabolism of cells and enhance activity of the skin cells, meanwhile, the radix ginseng extract, the rhizoma coptidis extract and the impatiens balsamina extract which have functions of whitening the skin and removing spots and can reduce oxygen free radicals are added and have synergistic effect with the fructus lycii stem cell extract, so that the whitening synergistic function is realized, a product can improve skin obviously, improve skin elasticity and accelerate proliferation process of the skin under the synergistic action of the multiple traditional Chinese medicine extracts, and the effect is remarkably better than that of single addition of one or two extracts.

The invention belongs to the technical field of hydrogen fuel cells, and in particular relates to a hydrogen circulatory system. The hydrogen circulatory system comprises a hydrogen ejector, a fuel cell, a stepping motor and a connecting passage, wherein the fuel cell is connected to the hydrogen ejector through a connecting pipe; the hydrogen ejector drives ball screw drive through the stepping motor; an ejector body is disposed on the hydrogen ejector; the ball screw is in threaded connection with a connecting body on the ejector body for drive; and the valve body of the hydrogen ejector andthe fuel cell form a circuit through the connecting pipe. The hydrogen circulatory system has the beneficial effects that a jet flow generated by the hydrogen ejector drives the hydrogen to circulatein the system so as to increase a hydrogen utilization rate, improve water balance in a fuel cell galvanic pile, and prevent flooding; and hydrogen ejector has good sealing performance; according tothe demands for different loads, the hydrogen circulation speed and hydrogen supply amount can be adjusted to meet the hydrogen demands of the hydrogen circulatory system under various working conditions.