226 results about "Low nitrogen" patented technology

The utility model discloses a hydrogen ammonia coupling low nitrogen burner relates to burner technical field, including first tank and second tank, be equipped with connecting subassembly between the first tank and the second tank, first tank far away from the one end of second tank is fixedly connected with the gas outlet pipe, the gas outlet pipe is communicated with first tank, and the gas outlet pipe is connected with the gas outlet pipe. A combustion assembly is arranged at one end of the gas outlet pipe away from the first tank; through the arrangement of the ammonia gas inlet pipe and the pipe connector, hydrogen and ammonia gas in a specific proportion can be injected into the cavity formed by the first tank body and the second tank body during working, the hydrogen and the ammonia gas are mixed through the premixing assembly and then sprayed out of the nozzle, the combustion temperature can be effectively reduced through the addition of the ammonia gas, NOx generation is reduced, meanwhile, the combustion speed of the ammonia gas is low, and the combustion efficiency is improved. And after the ammonia gas is mixed, the overall combustion speed can be reduced, the combustion stability is improved, so that the combustor has good combustion stability, and meanwhile, the emission of NOx is greatly reduced.

The invention relates to the technical field of gene engineering, in particular to application of wheat TaLNUE protein in regulation and control of low nitrogen stress tolerance of plants. According to the invention, a single-chain guide RNA of a target wheat TaLNUE gene is designed, an expression vector of the TaLNUE gene is knocked out, and the expression vector is transformed into wild type wheat, so that transgenic wheat with the function inhibited by the TaLNUE gene is obtained. Researches find that the spike length and the spikelet number of wheat under low nitrogen stress can be increased by inhibiting the expression of the wheat TaLNUE protein, so that the single plant yield and the total yield of the wheat under low nitrogen stress are increased, and the nitrogen absorption efficiency and the nitrogen utilization efficiency of the wheat under low nitrogen stress are improved. According to the technical scheme, a feasible method is provided for improving the wheat yield under low nitrogen stress by utilizing a genetic engineering technology.

The invention discloses a low-nitrogen gas burner suitable for various working conditions and a using method of the low-nitrogen gas burner. The low-nitrogen gas burner comprises an assembly cylinder, an outer-layer fire pan, a central fire pan, an inner-layer gas gun, an outer-layer gas gun and an oxygen gun. The height of the center fire pan is adjusted through the lifting assembly, and switching of three modes of air combustion supporting, oxygen-enriched combustion supporting and pure oxygen combustion supporting is achieved. The air adjusting assembly controls the combustion-supporting air flow; the flow comprehensive adjusting assembly adjusts fuel gas supply and oxygen supply in a linkage mode. The combustor adopts a staged combustion design, the inner-layer gas gun forms first-stage flame at a fire pan gap, the outer-layer gas gun and a combustion-supporting medium ejected from the central fire pan form second-stage combustion, and the temperature of the flame is reduced by ejecting hearth smoke. Cooperative control over all the executing mechanisms is achieved through the driving motor and the speed setting assembly, the beneficial effects that combustion modes are automatically switched, the flame temperature is accurately regulated and controlled, and emission of oxynitride is low are achieved, and the clean combustion requirements of different industrial furnaces can be met.

The invention relates to the technical field of biology, in particular to a ZmTCP19 gene mutant and application of the ZmTCP19 gene mutant to regulation and control of the nitrogen utilization rate, the growth amount and the plant height of corn. ZmTCP19 gene mutants (a mutant zmtcp19-1 and a mutant zmtcp19-2) are obtained through a molecular genetics means, the functions of the ZmTCP19 gene mutants are deeply analyzed and identified, and results show that under the condition of low nitrogen, the total fresh weight of the zmtcp19-1 is reduced by 30.33% compared with that of a control group, and under the condition of normal nitrogen, the total fresh weight of the zmtcp19-1 is reduced by 25.54% compared with that of the control group; under the condition of low nitrogen, the total fresh weight of zmtcp19-2 is reduced by 25.19% compared with that of a control group, and under the condition of normal nitrogen, the total fresh weight is reduced by 17.30% compared with that of the control group. Meanwhile, the ZmTCP19 gene mutant can reduce the plant height of the corn and improve the lodging resistance of the corn.

This invention relates to the field of thermal power generating unit operation control, and discloses a method for coordinated control of coal consumption and low-NOx emissions in supercritical units. The method includes: collecting operating data such as unit load, coal feed rate, air volume, furnace outlet oxygen content, CO concentration, SCR inlet NOx concentration, SCR outlet NOx concentration, ammonia injection rate, and main steam pressure; dividing the control cycle according to the load change rate and the lag state of heat release into the furnace; generating candidate coal consumption optimization actions within the steady-state control cycle, and performing low-NOx margin verification and burnout constraint verification; when the verification fails, it is determined to be a low-NOx coal consumption conflict state, restricting the reduction of oxygen content and total air volume, and sequentially performing secondary air layer distribution correction, burnout air opening correction, main steam pressure setting compensation, and ammonia injection feedforward correction; after the control action is executed, the corresponding action is maintained, rolled back, or frozen based on the retest results. This invention can improve the synergy between coal consumption control and low-NOx emission control.

This invention relates to a high-efficiency nitrogen and phosphorus removal composite constructed wetland system based on short-cut nitrification-anaerobic ammonium oxidation (ATAO) co-embedded particles. The system comprises a surface flow constructed wetland, a vertical subsurface flow constructed wetland, an aeration pond, and a horizontal subsurface flow constructed wetland arranged sequentially along the water flow direction. The horizontal subsurface flow constructed wetland includes a soil layer and a layer of short-cut nitrification-anaerobic ammonium oxidation co-embedded particle filler. The main body of the composite constructed wetland system is submerged in the river channel, forming a closed corridor container through the constructed wetlands and the ecological pond frame, making full use of previously unusable space and achieving space saving. Compared with existing technologies, this invention overcomes the shortcomings of existing constructed wetlands, such as large land area, low nitrogen and phosphorus removal efficiency, and significant susceptibility to natural environmental influences. It has stronger processing capacity and better adaptability, achieving low-carbon, energy-saving, green, and highly efficient nitrogen and phosphorus removal.

The invention belongs to the technical field of microalgae biological culture, discloses a method for promoting growth of nostoc by efficiently utilizing a nitrogen source through solid-liquid culture, and aims to solve the problems of low nitrogen source utilization rate and slow biomass accumulation in the conventional culture technology. The method is based on a closed photobioreactor with gas-liquid circulation, and comprises the following steps: preparing a nitrogen-free BG11 culture medium; coating nostoc on the surface of the sterilized porous hydrophilic sponge; placing the sponge in a reactor, and adding the culture medium until no accumulated water is infiltrated; after closing the reactor, controlling the temperature, lighting and other conditions, continuously / intermittently supplementing nitrogen and maintaining certain positive pressure, and circulating the culture medium to supplement nutrition; and taking the sponge after the culture is finished. The utilization rate of a nitrogen source is remarkably increased, the biomass obtained through culture is remarkably increased, culture conditions are stable, and the method is suitable for large-scale development of nostoc and development of high-added-value products.

The invention relates to a coal power plant flue gas denitration ammonia supply intelligent control method which comprises the following steps: acquiring historical data of coal power plant flue gas denitration and real-time detection data of a plurality of point locations on denitration inlet and outlet flue gas cross sections, and recording adjustment data of ammonia spraying branch pipe valves corresponding to ammonia spraying leveling of each point location, the historical data and the adjustment data are input into the LSTM neural network model to obtain nitrogen oxide prediction data at the next moment, the nitrogen oxide prediction data, the real-time detection data and the adjustment data are input into the random forest model to obtain a prediction value of the nitrogen oxide concentration of each point location, and the opening degree of an ammonia supply main adjustment valve is adjusted according to the average nitrogen oxide concentration to obtain the nitrogen oxide concentration of each point location. And adjusting the valve opening of each ammonia spraying branch pipe based on the predicted value of the nitrogen oxide concentration of each point location. Through the method and the device, the problem of low nitrogen supply amount control accuracy is solved, historical monitoring data and real-time detected multi-point detection data are integrated, and the accuracy of a prediction result is improved; leveling data are optimized through ammonia spraying, and a branch pipe control valve opening degree control strategy is provided.

The utility model discloses a coke oven gas low-nitrogen burner which comprises a burner body, a first gas inlet pipe is arranged on one side of the burner body, and the terminal of the first gas inlet pipe is connected with a gas outlet pipe. The fire gathering cover has the beneficial effects that the limiting frame is arranged at the position of the inserting hole in the fire gathering cover, and when the propeller drives the ignition rod to move downwards to enable the ignition gun to extend into the fire gathering cover through the inserting hole, the pull rod can be far away from the ignition rod through downward pulling force generated by downward movement of the ignition rod through the arranged hinge seat; after the ignition gun completes ignition, the propeller drives the ignition rod to move upwards, the pull rod is pulled again to be close to the ignition rod, the sliding cover slides in the limiting frame again to cover the insertion hole, and the situation that the flow path of flames is changed due to the formed insertion hole is avoided. The flame concentration effect is prevented from being reduced to influence the combustion efficiency.

The application discloses a kind of low nitrogen emission natural draft burners, it is related to low nitrogen burner field, including primary air structure, primary gas structure, secondary gas structure, tertiary gas structure, circulating flue gas structure, ignition burner, secondary air structure, secondary combustion zone, purging air structure.The low nitrogen emission natural draft burner of the application reduces the combustion reaction temperature and reaction rate, overcomes the problem of insufficient combustion air momentum of natural draft burner, inhibits unorganized diffusion combustion, effectively improves the efficiency of combustion, inhibits the generation of NOx, the fuel staging of burner uses multi-level, multi-direction distribution, strengthens the stability of combustion, adjusts control according to use, uses high-speed multi-state jet, while inhibiting backfire and local high temperature, further inhibits the influence of environment on natural draft burner, with natural ventilation and forced air blowing two working modes.

The invention discloses a gene for promoting low-nitrogen efficient utilization of rice and enlarging grains and application of the gene. The gene is derived from rice and is named as OsUGT, and the nucleotide sequence of the gene is shown as SEQ ID NO.1; the amino acid sequence of the protein coded by the gene is as shown in SEQ ID NO. 2. The invention provides a construction method of an OsUGT gene overexpressed transgenic rice strain, which comprises the following steps: constructing pRHVc-OsUGT recombinant plasmids, transforming the pRHVc-OsUGT recombinant plasmids into calluses through an agrobacterium tumefaciens-mediated method, and screening resistant calluses and regenerating plants to obtain the OsUGT gene overexpressed rice. The OsUGT gene is overexpressed in a rice plant by adopting a pRHVc vector through a transgenic technology, so that the nitrogen utilization efficiency of the plant in a medium-low nitrogen stress environment can be remarkably improved, grain enlargement and grain weight increase can be effectively promoted, stable improvement of the crop yield under a low-nitrogen condition is realized, and the technical effect is clear and efficient.

The utility model relates to the technical field of low-nitrogen combustors, and provides a low-nitrogen combustor internal pressure detection device which comprises a multilateral lantern ring assembly, a plurality of triangular turning plates and a force detection mechanism, the multilateral lantern ring assembly is fixedly arranged on one side, close to a ventilation pipeline, of a primary air pipe and a secondary air pipe, and the triangular turning plates are arranged on the multilateral lantern ring assembly. The multiple triangular turning plates are rotationally connected to the multilateral lantern ring assembly, the multiple triangular turning plates are arranged in the primary air pipe and surround the primary air pipe in a circumferential mode, the multiple side edge contact strength detection mechanisms of the adjacent triangular turning plates are arranged, and the multiple strength detection mechanisms are fixedly connected to the multilateral lantern ring assembly. By means of the technical scheme, the problem that in the prior art, when airflow flows unstably, the real gas pressure is difficult to measure is solved.

The present invention discloses a low-nitrogen closed combustion and purification system for low-calorific value associated gas, which relates to the field of energy and environmental protection technology. The system includes a fuel proportioning module, which is used to obtain methane concentration data and flow data of the low-calorific value associated gas, determine the mixing ratio of the auxiliary ignition fuel, and adjust the fuel proportion of the low-calorific value associated gas; an air-fuel ratio control module, which is used to obtain combustion-supporting material supply data, calculate and determine the air-fuel ratio, and use the air-fuel ratio to pre-treat the low-calorific value associated gas after the proportion adjustment to generate a mixed gas to be ignited; the low-calorific value associated gas low-nitrogen closed combustion and purification system establishes a multi-parameter collaborative control mechanism, coordinates parameters of each link through a precise feedback system, and realizes efficient, stable and environmentally friendly associated gas combustion treatment.

The invention discloses an application of a TaERF9 gene in cooperation with histone modification to participate in nitrogen-mediated root development. The homologous genes of three subgenomes of the TaERF9 gene respectively correspond to the GenBank numbers of CM022223.1, CM022224.1 and CM022225.1 in NCBI (National Center of Biotechnology Information). According to the invention, wheat KN199 is directionally edited by using a CRISPR-Cas9 (clustered regularly interspaced short palindromic repeats-associated protein 9) technology, so that a mutant plant with TaERF9 function deletion is obtained. Protein interaction experiments prove that the TaERF9 can interact with the subunit SWN of the PRC2. The results of high-nitrogen and low-nitrogen water culture experiments show that TaERF9 gene mutation significantly promotes root development under a high-nitrogen condition; under the low-nitrogen condition, the root development of the mutant is kept similar to that of a wild type, the ability of balancing the root development under different nitrogen supply conditions is shown, and the effect of the TaERF9 gene in nitrogen response mediated root development regulation is revealed. That is to say, the TaERF9 gene can promote root development after mutation, so that a gene resource is provided for nitrogen-efficient breeding of crops.

The present invention discloses a low calorific value associated gas ultra-low nitrogen flameless combustion system, which relates to the field of combustion control technology. The system comprises a gas acquisition module, which acquires low calorific value gas through an inlet pipeline valve group to obtain dry low calorific value gas, and a premixing control module, which adopts multivariable coordinated control to adjust the mixing ratio of low calorific value gas and air with stable pressure to obtain premixed gas with stable flow rate. The low calorific value associated gas ultra-low nitrogen flameless combustion system adopts a recirculation channel and dynamic power distribution to adjust the combustion process, collects combustion state data through a flame probe and a temperature sensor, adjusts the airflow distribution of a porous ceramic burner according to the data, and finally achieves stable combustion output. The method can effectively improve the combustion efficiency and stability of low calorific value gas, reduce emissions, and is suitable for the efficient and clean utilization of low calorific value gases such as industrial waste gas.

The utility model discloses a split type low-nitrogen combustor of a boiler, and relates to the technical field of boiler combustion equipment. Comprising a supporting seat, a circle of guiding outer wall is fixedly connected to the top side of the supporting seat, a circle of circulating barrel is fixedly connected to one side of the guiding outer wall, a circle of collecting ring wall is fixedly connected between the inner walls of the ends, opposite to the supporting seat, of the circulating barrel, and a plurality of evenly-distributed recycling holes are formed in the surface of the collecting ring wall. And a circle of mixing pipe is fixedly connected between the inner walls of the recovery holes. According to the utility model, the overflowed flue gas which is not fully combusted is guided into the space between the circulating barrel and the mixing pipe through the arrangement of the outwards extending collecting ring wall and the recycling hole, and the flue gas which is not fully combusted is guided into the mixing pipe through the arrangement of the recycling outer wall and the guiding inner ring and is fully mixed with air for combustion; therefore, the nitrogen-containing gas is fully combusted, the content of nitrogen-containing compounds in the waste gas is reduced, and the pollution of the waste gas to the environment is reduced.

A dual-premixed ammonia burner relates to the field of ammonia combustion equipment. Addressing the problems of high ignition energy, slow combustion speed, poor flame stability, and difficulty in achieving stable combustion in large proportions with ammonia, this invention employs a dual premixing structure of auxiliary fuel gas premixed with ammonia and air premixed with ammonia, combined with a three-stage coaxial air duct and a regenerative pre-combustion chamber to achieve stable combustion. The burner includes an ignition gun, a primary air regulating damper, a secondary air regulating damper, a volute-shaped air casing, a primary air annular duct, swirl vanes, an annular ammonia multi-nozzle header, a pre-combustion chamber, a tertiary air multi-nozzle annular pipe, a flame monitor, and dual ammonia and auxiliary fuel inlets. This invention allows for wide load adjustment from 30% to 100%, no flameout at low loads, high burnout rate, and low nitrogen oxide emissions. It can operate with a large proportion of ammonia or pure gas, features a reasonable structure, reliable ignition, and stable safety, and is suitable for zero-carbon retrofitting and efficient utilization of green ammonia in industrial boilers, kilns, and other thermal equipment.

The invention discloses a water pipe type two-return-stroke energy-saving and emission-reducing superheater assembly of a traditional boiler, and relates to the superheater assembly researched and developed according to the wide-capacity radiation heat exchange concept of a boiler hearth and the physical phenomenon outside the field (see the specification in details) capable of generating extremely few nitrogen oxides, and a traditional boiler body with the modified hearth. After the flange pipelines are connected and combined, the technical advantages brought by obvious technical characteristics are derived: the heat efficiency is improved by about 6-8%, the steel consumption is reduced by about 20%, and the cost is reduced by 30% due to the application of the boiler hearth tolerance radiation heat exchange concept; forced circulation medium water is in a water pipe of the two-return-stroke energy-saving emission-reducing superheater assembly, the heat exchange second flow speed is increased to about 1.5 m, the technical characteristic completely meets the requirement of physical phenomena outside the field capable of generating extremely few nitric oxides, and the purpose of ultralow nitrogen emission of the nitric oxides smaller than or equal to 15 / 25 milligrams is achieved; meanwhile, other technical problems of the product in the background technology are solved.

The application provides a livestock and poultry manure black film fermentation resourceization method and system based on composite microbial flora immobilization and micro-oxygen control, and belongs to the technical field of livestock and poultry manure resourceization utilization and environmental engineering. The system comprises a fermentation tank, a fermentation liquid discharge pipe, a sewage pipe and an oxygen increasing assembly connected to the fermentation tank, a black film installed on the inner wall of the fermentation tank, a suspension assembly installed on the top of the fermentation tank, and a plurality of bag bodies suspended on the suspension assembly, wherein the bag bodies are filled with a mixture of composite immobilized microbial inoculum and soil, h2 / h1=0.3-0.75 is satisfied between the bag body and the fermentation tank, and the bag body is located below the livestock and poultry manure liquid level in the fermentation tank. The system has the advantages of short fermentation period, high harmless degree of fermentation liquid, low nitrogen loss rate and no obvious odor.

The utility model discloses a novel ultra-low nitrogen burner, which relates to the technical field of burners, and comprises a main body, the front side of the outer surface of the main body is rotatably connected with a positioning disc, the front side of the positioning disc is clamped with an adjusting turntable, and the front side of the adjusting turntable is clamped with a combustion chamber. The inclined lower corner and the inclined upper corner of the outer surface of the front side of the adjusting rotary disc are each provided with a guide arc groove. Through the arrangement of the mounting disc, the fixed supporting plate, the ash scraping plate and the dust collecting box, when dust is removed, the rotating mounting disc can drive the ash scraping plate fixedly connected with the fixed supporting plate to rotate on the inner wall of the burner nozzle through the fixed supporting plate fixedly connected with the rear side of the mounting disc, dust adhering to the inner wall of the burner nozzle is scraped, and the dust removing efficiency is improved. And scraped dust is guided by the inclined angle of the inner wall of the nozzle nozzle and slides into the dust collecting box, so that the inner wall of the interior of the nozzle is conveniently scraped and cleaned, and the situation that the service life of the nozzle is affected due to the fact that the nozzle is corroded and damaged by too much accumulated dust during combustion is prevented.

The invention relates to the technical field of natural gas hydrogen-doped power plant emission, and discloses a low nitrogen oxide emission combustion system and a combustion method, the low nitrogen oxide emission combustion system comprises a combustor, an air distributor, a flue gas circulation unit, a catalytic reduction unit and a control unit; the combustor comprises a shell with a combustion chamber, a hydrogen inlet, a natural gas inlet, an air inlet and a smoke outlet are formed in the shell, a hydrogen nozzle, a natural gas nozzle and an air nozzle are formed in the combustion chamber, and the natural gas nozzle, the hydrogen nozzle and the air nozzle are sequentially arranged in the combustion chamber at intervals from inside to outside. The air distributor is communicated with the air inlet, the flue gas circulation unit is provided with an air inlet side and an air outlet side, the air inlet side is communicated with the flue gas outlet, the air outlet side is communicated with the air distributor, and the catalytic reduction unit is communicated with the flue gas outlet. Natural gas and hydrogen are subjected to annular stratified combustion in the combustion chamber from inside to outside, flue gas reflows to dilute heat released by combustion of the natural gas and the hydrogen, and generation of nitric oxide in initial flue gas after combustion is reduced.

The application provides a kind of pyrolysis furnace low nitrogen combustion multi-objective optimization method, optimization system and storage medium.The multi-objective optimization method includes the following steps: establishing the turbulent combustion coupling model describing the flow and fuel combustion condition of the target pyrolysis furnace flue gas;Simplify the methane combustion mechanism of the turbulent combustion coupling model to obtain a simplified model describing the simplified mechanism of combustion reaction kinetics;Determine the input variables and output variables of the proxy model for predicting NOx emissions and flue heat efficiency;Obtain experimental sample points about the input variables and the output variables, and obtain the corresponding simulation results;Based on the experimental sample points and the simulation results, the proxy model is established via radial basis neural network;And the NSGA-II algorithm is used for multi-objective optimization of pyrolysis furnace low nitrogen combustion to determine the optimized input variable parameters balancing nitrogen emissions and thermal efficiency.

The utility model discloses a combustor low-nitrogen center gun and a low-nitrogen combustor, and relates to the field of fuel gas grading low-nitrogen combustors, the low-nitrogen combustor is suitable for fuel gas grading, the low-nitrogen center gun comprises a fuel gas vertical pipe, a fuel gas transverse pipe, a plurality of fuel gas dispersing nozzles and a fuel gas fire stabilizing sheet, and the fuel gas transverse pipe is provided with a plurality of fuel gas dispersing nozzles; each fuel gas dispersing nozzle is provided with a plurality of small-angle spraying holes; the fuel gas fire stabilizing sheet is positioned at the downstream of the fuel gas spraying direction of the fuel gas dispersing nozzle; the fuel gas vertical pipe is communicated with the fuel gas transverse pipe and used for inputting fuel gas. A low-nitrogen center gun is designed in a combustion-supporting air channel of a burner block, gas of the center gun is rapidly and evenly distributed in combustion-supporting air, and a fire stabilizing sheet is designed and arranged in the combustion-supporting air channel of the burner block at the position, corresponding to the gas concentration range, of which the gas concentration is within the gas concentration range of 80%-150% of the air excess coefficient after the gas and the air are mixed. A low-speed area and a backflow area in which fuel gas and air mixed gas flow are formed, the fuel gas of the center gun is ignited and ignited at the downstream of the fire stabilizing piece, the amount of nitrogen oxide generated by the center gun of the fuel gas grading low-nitrogen burner can be reduced, and the burner can obtain lower nitrogen oxide emission.

The utility model relates to the technical field of low-nitrogen combustors, in particular to an adjusting mechanism for a low-nitrogen combustor, which comprises a bottom plate, a low-nitrogen combustor body and a horizontal adjusting mechanism, the horizontal adjusting mechanism comprises a vertical plate fixedly connected to the upper end face of the bottom plate, and a sliding rod is slidably connected to the outer wall of the vertical plate in a penetrating manner; the vertical adjusting mechanism comprises a mounting plate located over the sliding rod, the low-nitrogen burner body is mounted on the upper end face of the mounting plate, and a jack is mounted between the mounting plate and the sliding rod. The low-nitrogen burner is simple to operate and convenient to use, the mounting plate can be driven to move up and down through the jack, so that the height of the low-nitrogen burner body is adjusted, the axis of the low-nitrogen burner body can be quickly aligned with the heating surface of a boiler for different boilers, adjustment is convenient, and time and labor are saved.

The invention relates to the technical field of fruit and vegetable cultivation, and provides a water chestnut fertilization influence analysis method based on principal component analysis, which comprises the following steps: setting a plurality of field trials for different nitrogen, phosphorus and potassium fertilization level treatment; measuring plant growth indexes, yield indexes, corm quality indexes and soil physicochemical property indexes of the treated water chestnuts; performing principal component analysis on the measured multiple indexes, and extracting principal components of which the characteristic values are greater than 1; calculating comprehensive scores of the processing according to the scores of the principal components and sorting the comprehensive scores; according to the comprehensive score, evaluating the comprehensive influence of different fertilization treatments on the growth, yield, quality and soil properties of the water chestnuts, and screening out an optimal fertilization combination. According to the method, the matching of medium-low nitrogen and phosphorus and medium-high potassium is clear, so that high yield and high quality are guaranteed, soil acidification can be effectively relieved, excessive consumption of nutrients is avoided, synergism of fertilizer saving, efficiency improvement, soil health and quality improvement is realized, and data support and quantitative decision basis are provided for scientific fertilization of the water chestnuts.

The present application relates to the technical field of soybean cultivation, and discloses a soybean cultivation device for low-nitrogen tolerance identification, which comprises a nutrient supply core, a main regulating liquid cavity and a plurality of independently arranged nutrient liquid cavities; a plurality of cultivation units are arranged around the nutrient supply core, and each cultivation unit comprises at least one independent culture cavity; and a liquid-gas delivery system controlled synchronously in different zones, which comprises a liquid delivery assembly and a liquid underflow vortex forming unit, and the liquid underflow vortex forming unit generates upward vortex flow at the bottom of the culture cavity through a spin-direction injector. The present application realizes accurate control of the multi-concentration nitrogen environment required for low-nitrogen tolerance identification of soybeans through a precise nutrient liquid gradient configuration system. The main regulating liquid cavity stores high-concentration nitrogen mother liquor, the spiral array nozzles of a multi-channel dynamic homogenizer inject the mother liquor into each independent nutrient liquid cavity in a quantitative manner, and a stable gradient working liquid is formed, so that the experimental conditions are repeatable, the concentration is accurately controllable, and a reliable foundation is provided for low-nitrogen tolerance germplasm screening.

The low-nitrogen combustor comprises a fixed shell, a gas pipeline, an air inlet, a flow dividing pipe and a flow dividing head, the gas pipeline is arranged in the fixed shell, a first spraying hole and a second spraying hole are formed in one end of the gas pipeline, and the flow dividing pipe is arranged in the fixed shell so that combustion-supporting air can be divided, and the mixing efficiency of the combustion-supporting air can be improved; a shunting head is arranged at one end of the shunting pipe; combustion-supporting air can be effectively distributed, then the mixing efficiency of fuel gas and the combustion-supporting air is improved, the input amount of the combustion-supporting air can be effectively reduced, the combustion efficiency can be improved through premixing of the fuel gas and the combustion-supporting air, and meanwhile, the temperature of a combustion chamber can be reduced through part of divided combustion-supporting air; on the other hand, smoke which is not fully combusted can be used for supporting combustion again, and the purposes of fully combusting and reducing the content of rapid and thermal nitrogen oxides are achieved.

A non-coding sRNA in Corynebacterium glutamicum and the use thereof. The non-coding sRNA has an RNA sequence having at least 90% or more sequence homology to a transcription product of the DNA sequence as shown in SEQ ID NO: 1. It is verified by means of experiments that the over-expression of the non-coding sRNA in a recombinant bacterium can significantly improve the yield of branched-chain amino acids, such as L-leucine, L-isoleucine and L-histidine, and the sugar-acid conversion rate, and also reduce the generation of by-product acid impurities. In terms of materials, relatively inexpensive molasses is selected, which provides rich carbon and nitrogen sources, to replace corn syrup which has more impurities. Moreover, the molasses is converted by means of enzymolysis into a nutrient substance containing more carbon and nitrogen sources that can be utilized by the strain. In addition, in order to control the carbon-to-nitrogen source ratio in a fermentation broth, a more accurate feeding process is selected, which can not only ensure the fermentation requirements of the strain, but can also effectively prevent excessively high or low nitrogen source levels in the fermentation broth, thereby achieving the aims of increasing the yield and the sugar-acid conversion rate, and reducing the by-product acid impurities.

This invention discloses the application of the BS1 protein in regulating plant vessel and pit structure and transport capacity. BS1 mediates acetylation modification of xylan at the pit edge, affecting the arrangement of nanofibers at the pit edge and the formation of pit structure, thereby influencing plant transport capacity. This invention is the first to discover that BS1-mediated acetylation modification at the pit edge plays an important role in pit nanostructure and morphology, as well as vessel transport capacity. Furthermore, BS1 It also mediates changes in pit structure under low-nitrogen treatment. Therefore, it can be controlled by regulating... BS1 The expression level or activity of rice under low nitrogen conditions, and the cultivation of rice with high transport capacity under low nitrogen conditions, have broad application prospects.

The utility model relates to a novel flame stabilizing disc of a low-nitrogen combustor, and belongs to the technical field of combustors. The air flow stabilizing device comprises an air conveying spray pipe, a fixing ring, an air flow stabilizing ring and a plurality of air flow deflectors, the air flow deflectors are arranged on the outer wall of the air conveying spray pipe, the air flow deflectors are sleeved with the fixing ring, and the air flow stabilizing ring is installed outside the fixing ring. The device is reasonable in structural design, safe, reliable and environment-friendly, NOx emission can be effectively reduced, and the use requirement is met.