112 results about "Nitrogen cycle" patented technology

A hydrocarbon recovery system is integrated with a fluff transfer system. The hydrocarbon recovery system is configured for contacting a wet polymer fluff with a purge gas to provide a purged polymer fluff and an overhead stream, and separating a solids stream, a recovered hydrocarbon stream, and a recovered purge gas from the overhead stream. The polymer fluff transfer system is configured to receive the purged polymer fluff from the hydrocarbon recovery system and transport the purged polymer fluff in the fluff transfer system via circulation of a fluff transfer gas. The hydrocarbon recovery system and the fluff transfer system are integrated by utilizing at least a portion of the recovered purge gas from the hydrocarbon recovery system in the fluff transfer system as the fluff transfer gas and optionally utilizing fluff transfer gas from the fluff transfer system as the purge gas in the hydrocarbon recovery system.

The invention relates to the technical field of agricultural ecological management, in particular to a farmland carbon and nitrogen cycle regulation and control method based on an ecological model, and the method comprises the following steps: S1, collecting ecological data of soil; s2, on the basis of the ecological data collected in the S1, constructing a carbon-nitrogen cycle regulation and control model by utilizing an ecological model coupled with a carbon-nitrogen cycle relationship; s3, performing carbon-nitrogen balance analysis by using the carbon-nitrogen cycle regulation and control model, and further determining a balance point between carbon-nitrogen input and loss; s4, formulating a carbon nitrogen regulation and control scheme according to a carbon nitrogen balance analysis result in S3; s5, performing specific operation according to the carbon nitrogen regulation and control scheme formulated in the S4; and S6, if the soil carbon and nitrogen content does not reach the set target, dynamically adjusting the carbon and nitrogen regulation and control scheme according to a feedback result. According to the invention, through combination of ecological data acquisition and a carbon nitrogen cycle model, dynamic balance regulation and control of farmland carbon nitrogen cycle are realized, the resource utilization efficiency is improved, the environmental pollution is reduced, and the sustainability of a soil ecological system is enhanced.

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 biochar preparation and sewage denitrification, in particular to a preparation method of quinone-rich biochar, a product and application of the quinone-rich biochar in strengthening iron-nitrogen circulation. The preparation method of the quinone-rich biochar comprises the following steps: drying, crushing and pyrolyzing a biomass material to obtain biochar; the biochar is soaked in an anthraquinone-2-sodium sulfonate solution, then filtering, washing and drying are conducted, and the quinone-rich biochar is obtained. According to the preparation method of the quinone-rich biochar, the biochar and the quinone-rich biochar are prepared by using aquatic plant yellow acorus calamus residues as raw materials, and reference is provided for resource utilization of aquatic plant biomass. The invention further provides a method for improving iron circulation-nitrogen conversion, the quinone-rich biochar has high quinonyl functional group content, and the iron circulation-nitrogen conversion efficiency can be remarkably improved by coupling the quinone-rich biochar with zero-valent iron.

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 discloses a farmland carbon and nitrogen cycle adjusting system based on an ecological model and an implementation method of the farmland carbon and nitrogen cycle adjusting system, and relates to the technical field of ecological adjustment. The system comprises a farmland information database, a visual circulating system and an adjusting system. The farmland information database comprises fertilization amount, climate conditions, soil characteristics and farmland management; the visual circulating system is used for simulating element migration among soil, plants and atmosphere, emission of greenhouse gases, organic matter analysis, CO2 generated by root respiration and dynamic behaviors of a soil carbon library and a nitrogen library; the system comprises a carbon nitrogen cycle adjustment analyzer and an early warning module. Soil data is collected in real time and imported into the mixed neural network model for carbon nitrogen cycle adjustment analysis, the optimal fertilizer usage amount and irrigation amount of the corresponding soil are calculated, the adjustment scheme is generated according to the analysis result, and the accuracy and efficiency of ecological system carbon nitrogen cycle monitoring are improved.

The invention discloses a device and a method for determining the denitrification rate of sediments in situ. According to the device, through field determination, transparent design and fluidity design, the accuracy and ecological correlation of denitrification rate determination are greatly improved, and an innovative technical support is provided for research and management of nitrogen circulation of a water body. And further determining the denitrification rates of rivers, shallow lakes and intertidal zones by using a method of combining stable isotopes with an in-situ culture room. The method can help understand back mechanisms of environmental problems such as algal blooms and oxygen deficit, improve water quality, provide important data support for ecological restoration, wetland protection and agricultural management, promote health and stability of an ecological system, provide important data for studying the effect of nitrogen circulation in global climate change, and promote implementation of sustainable management practice. Compared with a traditional laboratory measurement method, the method has remarkable advantages in the aspects of simulating natural conditions, spatial heterogeneity and ecological interaction, and the denitrification mechanism can be more comprehensively understood.

The invention discloses a three-dimensional network carbon nanofiber loaded iron-based material and application of the three-dimensional network carbon nanofiber loaded iron-based material to ammonia synthesis through electro-catalysis of nitrate radicals, an obtained catalytic system comprises a three-dimensional network carbon nanofiber carrier and uniformly distributed iron nanoparticles, and three-dimensional network carbon nanofibers have ultra-light density and ultra-high specific surface area; and the loaded iron nanoparticles play a role in connecting the carbon nanofibers, so that the electron conduction of the catalytic system is accelerated, and abundant reaction active sites are provided. The invention provides an efficient non-noble metal catalyst for electrocatalytic synthesis of nitrate ammonia, can simultaneously realize super-high yield and Faraday efficiency under large current, and has great significance in promoting development of electrocatalytic synthesis ammonia technology and promoting global nitrogen cycle.

The invention discloses a CO cryogenic separation device and method for nitrogen cycle refrigeration and CO washing demethanization, and belongs to the technical field of cryogenic separation. The device comprises an adsorption purification system, a CO cryogenic separation cold box system and a nitrogen refrigeration cycle system which are connected in sequence, purified gas from which impurities are removed by the adsorption purification system enters a CO cryogenic separation cold box system for rectification separation; cO-rich liquid separated in the denitrification tower of the CO cryogenic separation cold box system enters the top of the CO washing and demethanizing tower to serve as washing liquid to replace a condenser at the top of the CO washing and demethanizing tower; the nitrogen refrigeration cycle system guarantees cold and heat balance cycle in the rectification separation process of the CO cryogenic separation cold box system and provides cold energy for the first heat exchanger and the second heat exchanger.

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 provides a carbon sink potential prediction method and device fusing remote sensing and model technologies. The remote sensing and model technology fused carbon sink potential prediction method comprises the steps of inputting multi-temporal remote sensing data into a vegetation type identification model created 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 and nitrogen cycle model created based on historical crop distribution data and vegetation and soil dynamic data to obtain a regional carbon and nitrogen cycle dynamic simulation result; and determining carbon sink data according to the regional carbon nitrogen cycle dynamic simulation result. According to the method, the bottlenecks of insufficient current regional scale carbon accounting data and high uncertainty can be broken through, and carbon sink maximization is realized.

The invention discloses a novel method for in-situ rapid determination of denitrification potential of a water body. Devices needed by the novel method comprise a purging device, a modified flexible water bag, a water vapor separation device, a mass spectrometer, a peristaltic pump, a gas flowmeter, a PVC hose and the like. Compared with the traditional denitrification rate determination method, the method can realize in-situ rapid determination of the denitrification rate of the water body, can realize in-situ water taking, in-situ purging, in-situ culture and in-situ determination, ensures that various environmental factors in the denitrification process of the water body are not changed as much as possible, restores the real denitrification process of the water body, and has a good application prospect. The measurement result truly reflects the denitrification potential of the water body, the nitrogen cycle process in the natural environment is not affected in the measurement process, no chemicals harmful to the environment and human bodies are added, the method is suitable for research on the denitrification potential of various types of water bodies, long-term monitoring can be achieved, operation is easy, cost is low, and the method is suitable for popularization and application. No harm is caused to human health and the environment.

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 utility model provides a synthetic tail gas separation device based on a liquid nitrogen washing mode. The tail gas separation device comprises a TSA adsorption unit, a liquefaction separation unit, a mixed refrigeration circulation unit, a nitrogen circulation unit and a natural gas storage unit, the input end of the TSA adsorption unit is connected with the liquefaction separation unit; the output end of the liquefaction separation unit is respectively connected with the nitrogen-rich out-of-bound area, the hydrogen-rich out-of-bound area and the natural gas storage unit; the mixed refrigeration cycle unit and the nitrogen cycle unit are connected in parallel with the liquefaction separation unit; one path of the output end of the cold box is connected with the dehydrogenation tower; one path of the output end of the dehydrogenation tower is connected with a hydrogen-rich gas outlet area through a cold box; the other path is connected with the denitrification tower; one path of the output end of the denitrification tower is connected with the nitrogen-rich gas out-of-bound area through the return tank and the cold box in sequence; the other path of the output end of the cold box is connected with a liquid nitrogen cooling device through a liquid nitrogen flash tank and a liquid nitrogen booster pump in sequence; according to the device, a mixed refrigerant and liquid nitrogen are used as refrigerating media, and hydrogen-rich gas, nitrogen-rich gas and liquefied natural gas are obtained by separating synthetic tail gas through rectification.

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 microcosm device suitable for carbon and nitrogen cycle research of a rice-fish compound system. The microcosm device comprises a device main body, a gas production cover and a water inlet and drainage system. The device body comprises a main box body, a water tank and a fan. The gas production cover comprises a support, a cover, a gas production pipe and a sealing ring. The water inlet and drainage system comprises a water inlet pipe, a water outlet pipe, valves and flowmeters. The device is easy to build, disassemble and reuse in a field environment, and long-term or short-term observation can be carried out on the premise that a farmland plough layer is not damaged; and a researcher can conveniently collect gas, soil, water and animal samples. According to the invention, carbon-nitrogen cycle characteristic comparison of different modes of the rice-fish compound system can be carried out on a small-area field, and the method is also suitable for regional networking monitoring research for comparing different soil and climate condition differences. The method has important significance for deeply researching the carbon-nitrogen cycle characteristics and mechanism of the rice-fish compound system, and is worthy of popularization and application.

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 invention relates to a method for reducing nitrogen loss in a biogas slurry returning and utilization process. The method comprises the following steps: providing biochar; mixing the biochar with kitchen biogas slurry, and mixing and stirring under a constant temperature condition to obtain a biochar biogas slurry mixture; the charcoal and biogas slurry mixture is mixed with soil, so that the nitrogen loss can be reduced. According to the method, kitchen biogas slurry generated by anaerobic fermentation of kitchen waste and biochar are mixed and returned to the field, so that the use cost of wood vinegar is reduced, and the influence of biogas slurry coupled straw returning to the field on crops is avoided. The biochar can fix nitrogen nutrients in the biogas slurry through adsorption, slow release and immobilization effects of the biochar; nitrification can be inhibited, conversion of ammonia nitrogen to nitrate nitrogen is delayed, nitrate is promoted to be reduced into ammonia, and nitrate nitrogen is converted into ammonia nitrogen to be reserved; in addition, the biochar provides a habitat for nitrogen circulating microorganisms, nitrogen turnover of the farmland is accelerated, and therefore nitrogen loss caused by returning of the biogas slurry to the field is reduced.

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.