78 results about "Nitrogen cycle" patented technology

The invention discloses a hydrogen low-temperature precooling device and method with oxygen liquefaction, relates to the technical field of low-temperature refrigeration and hydrogen energy liquefaction, and is particularly suitable for cooperative utilization of a hydrogen-oxygen co-production system in green hydrogen production. The device comprises a hydrogen pre-cooling cold box, a liquid oxygen cold box, a mixed refrigerant compression and heat exchange system, a nitrogen circulating refrigeration system and a trace oxygen analyzer arranged in a nitrogen loop. The raw material hydrogen is subjected to purification, precooling, adsorption and ortho-parahydrogen conversion treatment to obtain liquefiable precooled hydrogen; a liquid oxygen product is output after raw material oxygen is purified and liquefied through heat exchange. According to the device, cryogenic heat exchange is achieved through two-stage circulation of mixed refrigerants and nitrogen, a multi-temperature-zone segmented heat exchange network is constructed through multiple separation tanks and a throttling path, and the refrigeration efficiency and the heat recovery capacity are both considered. And liquid oxygen cooling can be dynamically regulated and controlled through a temperature-regulating nitrogen path to adapt to various working conditions of the electrolytic cell. The device is compact in structure, high in safety, excellent in energy efficiency and suitable for the hydrogen-oxygen synergistic liquefaction treatment scene in a water electrolysis hydrogen production device.

The invention relates to the technical field of soil microbe monitoring, and discloses a hyperspectral remote sensing monitoring method for a soil microbe community and a storage medium, and the hyperspectral remote sensing monitoring method for the soil microbe community comprises the following steps: carrying out data enhancement and semi-supervised learning based on a generative adversarial network; constructing a generative adversarial network to generate pseudo-hyperspectral data conforming to physical constraints, and performing soil microbial community parameter prediction; constructing a physical information neural network, introducing a soil hydrothermal migration physical equation constraint, and inferring microorganism distribution and hydrothermal states of different depths of a soil profile; a nitrogen cycle kinetic equation is embedded in the physical information neural network, network output variables and physical constraint loss are expanded, and model parameters and process parameters are optimized; through the GAN data enhancement and semi-supervised learning technology, the prediction precision of the microbial community index can be maintained under the condition that the labeled sample size is reduced.

The invention provides acinetobacter for culturing prawns in saline-alkali water and application of the acinetobacter. The preservation number of the provided acinetobacter is CGMCC (China General Microbiological Culture Collection Center) No.36066. The acinetobacter soilis strain provided by the invention has remarkable comprehensive application advantages, can still keep higher growth activity and metabolic capability in a low-temperature environment, and continuously plays a water body purification function. Ammonia nitrogen and nitrite nitrogen in a water body can be efficiently degraded, the environment of the aquatic water body is remarkably improved by promoting the nitrogen circulation process, and harm caused by nitrogen pollution is reduced. In addition, the strain can effectively inhibit and prevent reproduction of pathogenic vibrios and reduce the occurrence risk of bacterial diseases of aquatic animals. The strain is high in safety, does not cause poison or stress reaction to bred animals even under the condition of high-concentration use, and has good ecological safety and environmental friendliness.

The invention discloses a soybean planting pollution reduction and carbon reduction measure effect prediction method based on machine learning scenario simulation, and belongs to the field of pollution reduction and carbon reduction, and the method comprises the steps: firstly collecting root system and microorganism data of a soybean planting area, and quantifying the interaction intensity through a random forest algorithm; the nitrogen circulation state is judged, and the acceleration degree is determined; predicting the carbon storage change in combination with a support vector machine model; further extracting ecological influence variables, and evaluating the environmental benefit optimization potential through cross-planting condition comparison; performing simulation adjustment on the measure combination with high potential to generate a combined index of nitrogen cycle and carbon storage change; determining a correction coefficient through clustering analysis trend data; and finally, multi-source simulation results are fused to generate a precise ecological influence assessment report. According to the method, the problems of insufficient root-microorganism interaction quantification, weak nitrogen-carbon process coupling analysis and large dynamic prediction deviation in the prior art are solved.

The present invention relates to a method for assessing the nitrogen interception capacity of rural rivers in plain river networks. To address the unclear nitrogen interception capacity of rural rivers in plain river networks, a river nitrogen cycle model (River-N) was developed that incorporates aquatic plants and biogeochemical cycles. Coupled with the existing EFDC (Effluent Three-Dimensional Hydrodynamic Model) and the NDP (Polder Nitrogen Cycle Model), the model simulates the input, output, migration, and transformation of three forms of nitrogen (particulate nitrogen, ammonia nitrogen, and nitrate nitrogen) in rural rivers, exploring the source-sink balance of nitrogen and quantitatively assessing the nitrogen interception capacity of rural rivers in plain river networks. This method integrates simulation techniques for river network hydrodynamics, biogeochemical cycles, polder hydrology, and nitrogen loss, fully accounting for the unique characteristics of slow flow and widespread aquatic plants in rural rivers in plain river networks. This method addresses the challenge of accurately estimating nitrogen interception in rural rivers in plain river networks, providing technical support for the treatment and management of nitrogen pollution in rural rivers in these regions.

The invention discloses an earthworm compost upgrading method based on a bacillus velezensis BV-1 aerobic compost product. Comprising the following steps: by taking an aerobic compost rotten product pretreated by bacillus velezensis BV-1 as a substrate, adjusting the moisture content of the substrate to a proper value without additionally adding a conditioner, inoculating eisenia foetida, performing earthworm composting in a dark environment, slightly turning piles every 4-5 days during the period to prevent anaerobism, and maintaining the moisture content of the substrate to be stable. The quality of the earthworm cast is remarkably improved through'matrix advantage + microorganism continuation effect 'of a BV-1 aerobic composting product, and the total nitrogen content of the earthworm cast reaches 18.29 g / kg and is improved by 12.6% compared with that of a control group; the conductivity is reduced to 1.84 mS / cm and is reduced by 8.91% compared with that of a control group; meanwhile, a nitrogen cycle functional gene (the relative expression quantity of the nosZ gene is increased by 15 times compared with that of a control group) is activated, organic matter degrading bacteria Arenibacter (the relative abundance is 8.37%) are enriched, and unification of high nitrogen, low salt and high biological activity of earthworm compost products is achieved.

The invention provides a method and a system for regulating and controlling nitrogen circulation of a constructed wetland by using root exudates, and relates to the technical field of constructed wetland sewage treatment. The method comprises the following steps: 1) constructing a plant root exudate database; 2) training a machine learning prediction model and optimizing parameters by adopting a machine learning algorithm and using the data of the plant root exudate database; 3) screening the compounds in the natural product database by using the machine learning prediction model in the step 2), predicting the denitrification potential of the compounds, and selecting candidate substances; and 4) constructing a microcosm culture system, in the microcosm culture system, detecting nitrogen removal and microbial response by adding the candidate substances obtained in the step 3) with different concentration gradients, and verifying the denitrification effect of the candidate substances. The system disclosed by the invention is high in datamation degree, simple and convenient to operate, accurate in prediction and low in cost, provides a new technical means for enhanced denitrification of the constructed wetland, and has a good industrial application prospect.

The invention discloses a biochar rice field water carbon and nitrogen cycle process simulation method based on a DNDC model, which comprises the following steps: firstly obtaining basic data of rice growth and test monitoring data of a rice ecosystem under biochar treatment, and then constructing a biochar organic fertilizer module to improve the DNDC model; the method comprises the following steps: establishing a Biochar-DNDC model according to basic data of rice growth and test monitoring data, then calibrating and verifying the Biochar-DNDC model by adopting the test monitoring data, and finally simulating the water carbon and nitrogen cycle process of the biochar rice field by adopting the verified Biochar-DNDC model to obtain the water carbon and nitrogen cycle process of a rice field ecosystem under the condition that biochar is applied to a target area. The simulation accuracy of the DNDC model on the charcoal rice field water carbon nitrogen cycle process is improved, and the simulation result of the charcoal rice ecosystem carbon sequestration emission reduction synergy potential is more real and accurate.

The invention discloses a device and method for preparing a gold ore sample based on liquid nitrogen spraying circulating freezing, and belongs to the technical field of geological mineral sample preparation. The device for preparing the gold ore sample based on liquid nitrogen spraying circulating freezing comprises a base, and a preparation cylinder and a liquid nitrogen circulating device are fixedly installed on the base; a safety valve is installed on the liquid nitrogen circulating device, a liquid inlet pipe is fixedly installed on one side of the liquid nitrogen circulating device, a circulating pipe and a backflow pipe are fixedly connected between the liquid nitrogen circulating device and the preparation cylinder, a separation assembly is arranged in the preparation cylinder, the circulating pipe penetrates through the separation assembly, and a spraying pipe is installed in the preparation cylinder in a sealed mode through a rotating connector. The spraying pipe is provided with the spraying device, the spraying device is connected with the safety valve, liquid nitrogen is injected into the liquid nitrogen circulating device through the liquid inlet pipe, and after the circulating pump is started, the liquid nitrogen enters the preparation cylinder through the circulating pipe and is sprayed to the surface of the ore in the form of fine fog drops through the spraying pipe, so that the temperature of the ore is reduced to below-160 DEG C within a short time, and the embrittlement effect is achieved.

The utility model discloses a nitrogen circulating and collecting device. Wherein the nitrous oxide monitoring chamber is hermetically mounted above the plant growth chamber; a space is defined between the nitrous oxide monitoring chamber and the plant growth chamber, a gas inlet and a gas outlet are formed in the nitrous oxide monitoring chamber, and the gas outlet is sequentially connected with a nitrous oxide sensor, a gas pump and the gas inlet through a gas pipeline to form a loop; and the lower end of the nitrous oxide monitoring chamber is integrally and fixedly connected with an annular fitting step. According to the utility model, the interference of man-made disturbance in the acquisition process can be reduced, and the accuracy and reliability of monitoring data are improved.

The invention discloses a device and a method for preparing high-pressure CO through pressurization dehydrogenation and demethanization of a nitrogen throttling expansion CO pump, and belongs to the technical field of chemical cryogenic separation. The specific structure is as follows: purified gas from the upstream is cooled by a first heat exchanger, a stripping tower reboiler and a second heat exchanger in sequence and then enters a hydrogen-rich gas flash tank; a liquid phase at the bottom of the hydrogen-rich gas flash tank enters a stripping tower for continuous separation; a liquid phase at the bottom of the stripping tower enters a demethanizing tower for demethanizing treatment; a gas phase at the top of the demethanization tower is completely condensed by a demethanization tower condenser and then enters a demethanization tower separation tank, a liquid phase at the bottom of the separation tank is pressurized by a CO liquid pump and then is reheated by a second heat exchanger and a first heat exchanger in sequence, and a high-pressure CO product is obtained and discharged out of the cold box. The nitrogen circulation compressor provides nitrogen circulation refrigeration for the cold box, one part of circulation nitrogen provides cold energy for the demethanizer condenser after being pre-cooled and throttled and then flows back to the nitrogen circulation compressor, and the other part of circulation nitrogen is expanded and refrigerated through the nitrogen expansion machine and provides additional cold energy supplement for the cold box.

The invention discloses a wetland nitrogen cycle optimization method and system based on machine learning, and belongs to the technical field of ecological engineering.The method comprises the steps that according to a comprehensive environment data set, a transverse lateral infiltration path and a vertical priority flow path are recognized, spatio-temporal evolution simulation is conducted through a cellular automaton model, and a nitrogen migration path is constructed; analyzing the interaction between the water flow driving flux and the underground water level on the path resistance, and determining the broadening degree of the transverse lateral seepage path; if the widening degree exceeds a preset threshold value, integrating the water body turbulence intensity data and the flow velocity shear effect value, and obtaining a bubble escape rate and a surface sediment disturbance frequency; calculating the nitrogen saturation and the spatial distribution of the sediment particle suspension amount, and obtaining the total re-release flux through flux overlay analysis; and constructing a nitrogen loss flux model in combination with the fluctuation rule, simulating the change of the nitrogen loss proportion, and determining the net nitrogen loss flux. According to the invention, fine monitoring of the dynamic change of wetland nitrogen can be realized.

The present invention provides a combined system of an air separation device and a hydrogen liquefaction precooling device for comprehensively utilizing LNG cold energy, and relates to the field of nitrogen cycle refrigeration. The system comprises: a hydrogen liquefaction precooling device, wherein the hydrogen liquefaction precooling device comprises a hydrogen liquefaction precooling cold box and a hydrogen liquefaction cryogenic cold box. A raw hydrogen pipeline passes through the hydrogen liquefaction precooling cold box and the hydrogen liquefaction cryogenic cold box in sequence. A supplementary precooling refrigerant pipeline is connected to the hydrogen liquefaction precooling cold box 101. Liquid nitrogen separated in an air rectification unit, liquid nitrogen separated by a gas-liquid separator, or liquid nitrogen output by a main heat exchange unit enters the hydrogen liquefaction precooling cold box, providing cooling capacity for the hydrogen liquefaction precooling cold box, thereby reducing the temperature of the raw hydrogen in the hydrogen liquefaction process, completing the precooling stage of the raw hydrogen, effectively reducing the power consumption of the air separation device and the hydrogen liquefaction device, saving the number of refrigeration equipment, reducing equipment investment, reducing cooling energy loss, and improving energy utilization.

This invention relates to the field of molten salt energy storage technology and discloses a molten salt energy storage system. The molten salt energy storage system includes: a molten salt tank with an inner cavity and an outlet and inlet communicating with the inner cavity; the inner cavity is capable of storing nitrogen and high-temperature molten salt for energy storage; a nitrogen circulation pipeline connected between the outlet and inlet for exporting nitrogen from the molten salt tank through the outlet and importing it through the inlet; and a flow-dispersing device located in the inner cavity and communicating with the inlet, the flow-dispersing device including a jet nozzle, through which nitrogen introduced from the inlet is exported to agitate the molten salt. This invention places the flow-dispersing device in the inner cavity of the molten salt tank. The nitrogen exported through the jet nozzle of the flow-dispersing device forms an upward flow of bubbles, agitating the molten salt in the tank. This enhances the fluidity of the molten salt within the tank, improves the heat exchange effect between the molten salt and the heating and releasing units within the tank, increases the heat transfer efficiency of the molten salt, and improves the heat exchange effect between the energy release stage and the water in the water pipeline. It also improves the uniformity of nitrogen sealing.

The invention discloses a light-driven nitrogen cycle pyrolysis-gasification biomass graded utilization system and method, and relates to the technical field of biomass graded utilization, the system comprises a pretreatment unit, a light-driven nitrogen-doped pyrolysis reactor and a photocatalytic nitrogen de-intercalation gasification reactor as core parts, an energy collection unit and a post-treatment unit. The method comprises condensation ammonia-doped pyrolysis and condensation gasification: pretreated biomass is subjected to condensation ammonia-doped pyrolysis in a pyrolysis section to generate high-activity nitrogen-doped coke and hydrogen, then the nitrogen-doped coke enters a gasification section to be subjected to condensation gasification, under the action of high-concentration water vapor, nitrogen elements in the coke are deintercalated, more active sites are released, NH3 is generated at the same time, and the nitrogen-doped coke enters the gasification section to be subjected to condensation gasification; the nitrogen can flow back to the pyrolysis zone for cyclic utilization, and a nitrogen doping-de-intercalation catalytic cycle process is formed. The light-driven nitrogen cycle grading technology is adopted, efficient doping of nitrogen elements at the high temperature is achieved, high-activity nitrogen-doped coke is generated, and production of high-quality synthesis gas and cyclic utilization of nitrogen are achieved.

The utility model belongs to refrigeration technical field, specifically disclose a kind of nitrogen circulation refrigeration system for cryogenic separation device, including fractionating column, nitrogen compressor, plate heat exchanger and intake pipe;Raw gas is connected to fractionating column by intake pipe after passing plate heat exchanger, can carry out preliminary cooling to raw gas;The inside top of fractionating column is equipped with tubular heat exchanger, and the top of fractionating column is connected with first gas outlet pipe, and first gas outlet pipe is connected with second gas outlet pipe after passing plate heat exchanger, reheats and exports process gas;Tubular heat exchanger is connected by first pipeline and is connected to nitrogen compressor again by the internal pipeline of plate heat exchanger, and after passing nitrogen compressor, the high-pressure normal-temperature nitrogen gas generated by it is connected back to plate heat exchanger by third pipeline, and after preliminary cooling by plate heat exchanger, it is connected back to tubular heat exchanger by fourth pipeline to provide cold quantity, can realize the rapid cooling of fractionating column overhead, shorten driving cycle.

A phage and its use in compensating soil nitrogen fixation: Klebsiella pneumoniae phage φYSZKA, wherein the method has solved some problems of conventional azotobacters, such as high cost, interspecific competition and limited range of application. Through phage transplantation, the efficiency of microbial nitrogen fixation in soil can be improved, and thus, more nitrogen sources may be provided for the nitrogen cycle and plant growth in ecosystems. Also, a new solution is provided for the nitrogen sequestration process of soil in saline-alkali lands, tea plantations and pesticide-polluted sites in China.

The invention provides cold-resistant bacillus subtilis for pond culture under a low-temperature condition. The preservation number of the cold-resistant bacillus subtilis is CGMCC (China General Microbiological Culture Collection Center) No.36068. The cold-resistant bacillus subtilis strain provided by the invention has remarkable comprehensive application advantages, can keep higher growth activity and metabolic capability in a low-temperature environment, and continuously plays a water body purification function. Ammonia nitrogen and nitrite nitrogen in a water body can be efficiently degraded, the environment of the aquatic water body is remarkably improved by promoting the nitrogen circulation process, and harm caused by nitrogen pollution is reduced. The strain is high in safety, does not cause poison or stress reaction to bred animals even under the condition of high-concentration use, and has good ecological safety and environmental friendliness.

The utility model relates to a liquefied natural gas boil-off gas nitrogen stripping and helium capturing system which can improve the helium recovery efficiency and comprises a recovery tower, a rectifying tower, a crude helium tower and a nitrogen circulating cooling device. A gas inlet of the recovery tower is communicated with the storage tank, a first tower top reflux cooler is arranged in the recovery tower, a gas phase outlet of the recovery tower is connected with a gas phase inlet of the rectifying tower, and a liquid phase outlet at the tower bottom of the recovery tower is communicated with the storage tank; a second tower top reflux cooler is arranged in the rectifying tower, a reboiler is arranged at the bottom, and a gas phase outlet of the rectifying tower is communicated with a gas phase inlet of the crude helium tower; a third tower top reflux cooler is arranged in the crude helium tower, a liquid phase outlet of the crude helium tower is communicated with an inlet of the third tower top reflux cooler, and liquid nitrogen flowing out of the crude helium tower can flow to the third tower top reflux cooler to serve as a cold source; and the nitrogen circulating cooling device is used for providing liquid nitrogen as a refrigerant for the first tower top reflux cooler and the second tower top reflux cooler and recovering nitrogen generated by vaporization of the liquid nitrogen, and providing nitrogen for the reboiler and recovering nitrogen.

The invention belongs to the technical field of biological agriculture, and particularly discloses a method for improving soil fertility by intercropping tea champagne and enriching nitrogen circulating microorganisms. The method comprises the following steps of selecting a garden plot, performing soil preparation, and performing line-to-line intercropping on the big-leaf tea and the areca catechu. The invention discloses a method for improving soil fertility by intercropping tea champagne and enriching nitrogen circulating microorganisms, which can significantly improve the diversity of soil microbial communities, improve soil fertility, improve and maintain nitrogen supply by activating the microbial function of soil, and significantly reduce the dependence on chemical nitrogen fertilizer.

The present application belongs to the field of microbial technology. More particularly, it relates to a salt-tolerant Bradyrhizobium sp. strain RY15 and its application. The Bradyrhizobium sp. strain RY15 provided by the present application has excellent salt tolerance and can significantly promote the growth and development and nodule fixation ability of Desmodium velutinum. The pot experiment results prove that the application of the RY15 strain can significantly increase the fresh weight of the aboveground part, the fresh weight of the underground part and the number of nodules of Desmodium velutinum; in the saline soil field, the yield of the pasture is increased by 68.89% after the inoculation of the RY15 inoculant. The RY15 strain of the present application can be made into a liquid or solid microbial inoculant, which is suitable for seed dressing, root soaking or soil application, and is simple to operate, low in cost and easy to popularize. The RY15 strain of the present application is a natural symbiotic bacterium, is safe and non-toxic, can improve the nitrogen cycle of soil, expand the planting of high-quality leguminous forage in saline-alkali soil, and has good application prospect and application value.

This invention discloses a method for regulating early maturity of citrus fruits based on environmental data processing under plastic film mulching, specifically relating to the fields of agricultural data processing and technology extension services. It addresses the problem that existing early maturity regulation models, due to their singular optimization objective, neglect the microecological changes caused by plastic film mulching, leading to increased pest and disease risks. By acquiring soil temperature and humidity data after plastic film mulching, and based on a pre-established correlation model, the method determines the pathogen inhibition function imbalance index and carbon and nitrogen cycle disturbance intensity, characterizing soil microecological health, and assesses the risk level of pest and disease occurrence. Combined with sensitivity analysis results of the original agricultural operation plan, key agricultural operation parameters are adjusted in a targeted manner. The generated comprehensive regulation plan is serialized into a distributable and executable agricultural technology extension service package and promoted for implementation. This achieves end-to-end data processing from environmental data to microecological risk assessment to customized agronomic plan generation and services, improving the accuracy of agricultural technology extension.

The application provides a carbon sink potential prediction method and device fusing remote sensing and model technology. The carbon sink potential prediction method fusing remote sensing and model technology comprises the following steps: inputting multi-temporal remote sensing data into a vegetation type identification model based on historical remote sensing data and historical vegetation type labels to obtain vegetation structure dynamic distribution data; inputting the vegetation structure dynamic distribution data into a regional carbon-nitrogen cycle model based on historical crop distribution data and vegetation and soil dynamic data to obtain a regional carbon-nitrogen cycle dynamic simulation result; and determining carbon sink data according to the regional carbon-nitrogen cycle dynamic simulation result. The application can break through the bottleneck of insufficient regional scale carbon accounting data and high uncertainty, and realize carbon sink maximization.

The invention discloses a paddy field nitrogen cycle simulation and optimization management method, a paddy field nitrogen cycle simulation and optimization management system and a storage medium, and belongs to the technical field of agro-ecosystem modeling and nitrogen cycle management. Dynamically simulating biomass change of periphyton and a nitrogen exchange process of the periphyton with surface soil and a field water accumulation layer, and outputting nitrogen destination data; generating a nitrogen fertilizer management strategy by combining the growth stage characteristics of the periphyton on the basis of the output nitrogen element destination data; wherein the periphyton integrated model is constructed by adding a periphyton dynamic module in a paddy field nitrogen cycle model; by integrating the periphyton biodynamics module, the regulation and control effect of the periphyton biodynamics module on a nitrogen source-sink function is quantified, so that a nitrogen fertilizer management strategy is optimized.

The invention relates to a soil nitrogen cycle regulation and control method based on tire wear particles. The method comprises the steps that the tire wear particles are obtained; mixing the tire wear particles with soil, and performing pretreatment; wherein the mass ratio of the tire wear particles to the soil is 0.1%-0.5%; putting the mixed tire wear particles and soil into an illumination incubator, and culturing under a preset culture condition; collecting soil samples for analysis at a plurality of time points set in the culture period; wherein the addition of the tire wear particles affects the expression of nitrogen cycle genes in the microflora. The method has the beneficial effects that the tendency that the TWPs promotes ammonification in the soil is determined, the soil environment condition is changed by adding the TWPs, and particularly, the availability of nitrogen forms and the utilization mode of microorganisms on nitrogen in the forms are influenced.

The invention relates to the technical field of carbon and nitrogen fixation, and discloses a carbon and nitrogen fixation system based on cooperation of an optical nano material and microorganisms and a construction method of the carbon and nitrogen fixation system. The system comprises a carbon fixation microorganism, a nitrogen fixation microorganism and a TiO2 / CdS heterojunction nano material. The carbon sequestration and nitrogen fixation system based on synergism of the optical nanomaterial and the microorganisms is formed through the carbon sequestration microorganisms, the nitrogen fixation microorganisms and the TiO2 / CdS heterojunction nanomaterial, and the system can remarkably improve the carbon and nitrogen circulation efficiency and shows excellent performance in the aspects of photocatalytic hydrogen production and carbon dioxide fixation. Verification shows that compared with a single system, the hydrogen yield, the carbon dioxide fixation rate and the nitrogen reduction conversion rate of the carbon fixation and nitrogen fixation system in which the photonanomaterial and the microorganisms are coordinated are increased by 85%, 3 times and 2 times respectively.

The present application relates to a kind of low-carbon local partial circumfluent flow contact wetland system and its water quality purification method, belong to water treatment technical field.The low-carbon local partial circumfluent flow contact wetland system of the present application, including ecological activity recovery unit, nitrogen cycle intensification unit, circumfluent flow contact phosphorus cycle intensification unit and ecological stable unit in series, by the use of plant growth limit ring, frame filler and large leaf floating plant joint construction denitrification habitat, circumfluent flow contact array type filler column distribution, establish filler column adsorption and hold phosphorus cycle path of plant absorption and utilization, inverted horn support steel wire bundle support gramineae method etc.The combination use of technical scheme reaches no power low-carbon, prevent plant succession invasion, circumfluent flow contact anti-clogging, nutrient salt enrichment plant root system convenient recovery, with the beneficial effects such as enhanced denitrification and phosphorus removal, realize a kind of low-carbon local partial circumfluent flow contact wetland system applied to ecological safety buffer zone.

This invention relates to a device and method for dual-cycle refrigeration LNG helium extraction and light hydrocarbon recovery, belonging to the field of cryogenic liquefaction separation and natural gas helium extraction technology. The device integrates a mixed refrigerant refrigeration cycle and a nitrogen refrigeration cycle, and sequentially includes a feed gas pretreatment unit, a light hydrocarbon recovery unit, a denitrification liquefaction unit, and a helium extraction unit. The mixed refrigerant cycle provides cooling capacity for feed gas cooling liquefaction, light hydrocarbon recovery, and natural gas denitrification processes, while the nitrogen cycle provides deep cooling capacity for extracting crude helium from nitrogen-rich gas. In terms of method, the purified feed gas sequentially undergoes pretreatment, light hydrocarbon recovery, denitrification, and helium extraction steps to simultaneously produce LNG, crude helium, LPG, and stabilized light hydrocarbons. This invention has advantages such as high process energy efficiency, high helium and propane recovery rates, high purity of co-produced products, and reliable operation, realizing the high-value comprehensive utilization of natural gas resources.

The present application belongs to the technical field of river ecological restoration and water purification, and particularly relates to a river water ecological regulation and control device, aiming at solving the problems of poor microbial habitat, insufficient carbon source supply, limited purification effect and the like in the existing river water ecological restoration. The device is composed of a four-pyramid frame, a steel wire mesh, a central carbon source slow-release pipe and porous fillers. The four-pyramid frame is formed by welding profile steel, and the bottom and the periphery are welded with the steel wire mesh. The central carbon source slow-release pipe is vertically arranged in the center of the four-pyramid frame, and the pipe is filled with corn cobs. The porous fillers are filled in layers from bottom to top, the bottom layer is a volcanic rock layer, the second layer is a zeolite layer, and the top layer is a mixed layer of volcanic rock and zeolite. The present application provides a stable habitat for microorganisms and benthic animals, continuously releases carbon sources, strengthens the nitrogen cycle function, and has a significant water purification effect. The device has a stable structure, is convenient to maintain, has low cost, causes no secondary pollution, and can be widely applied to various river ecological restoration projects.