290 results about "Low nitrogen" patented technology

The invention relates to the technical field of microorganisms, and provides a low-temperature-resistant heterotrophic nitrification-aerobic denitrification pseudomonas and application thereof, the strain is pseudomonas (Pseudomonas sp.) SW1, and the preservation number is CCTCC (China Center for Type Culture Collection) NO: M 20221797. The low-temperature-resistant heterotrophic nitrification-aerobic denitrification bacterium Pseudomonas sp. SW1 has the characteristic of low temperature resistance, can well grow at 4-10 DEG C, and has relatively strong heterotrophic nitrification-aerobic denitrification nitrogen removal capability, and the enrichment culture of the strain is carried out in a relatively low nitrogen source, and the condition is extremely consistent with the application scene of the strain in domestic sewage.

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 discloses a low-calorific-value associated gas ultralow-nitrogen flameless combustion system, which relates to the technical field of combustion control and comprises a gas acquisition module, a premixing control module, a low-calorific-value gas pre-mixing module, a low-calorific-value gas pre-mixing module and a low-calorific-value gas pre-mixing module, multivariable cooperative control is adopted to adjust the mixing proportion of the low-heating-value gas with the stable pressure and the air, and premixed gas with the stable flow is obtained; according to the ultralow-nitrogen flameless combustion system for the low-heating-value associated gas, the combustion process is adjusted through a recirculation channel and dynamic power distribution, combustion state data are collected through a flame probe and a temperature sensor, airflow distribution of the porous ceramic combustor is adjusted according to the data, and finally stable combustion output is achieved. The method can effectively improve the combustion efficiency and stability of the low-heating-value gas and reduce emission, and is suitable for efficient and clean utilization of the low-heating-value gas such as industrial waste gas.

The embodiment of the invention provides a fermentation method of L-leucine and L-isoleucine. According to the method, at least one L-leucine or L-isoleucine producing strain is used for fermentation culture; according to the method, relatively cheap molasses with rich carbon and nitrogen sources is selected as materials, corn steep liquor with more impurities is abandoned, and the molasses is converted into a nutrient substance containing more carbon and nitrogen sources capable of being utilized by strains through enzymolysis; in addition, in order to control the ratio of carbon and nitrogen sources in the fermentation liquor, a more accurate material supplementing process is selected, so that the fermentation requirements of strains can be guaranteed, and the situation that the liquid nitrogen source of the fermentation liquor is too high and too low can be effectively avoided, and the purposes of increasing the yield and the sugar acid conversion rate and reducing heteroacid byproducts are achieved.

The invention discloses an application of a rice OsRNU6 gene. The login number of the nucleotide sequence of the OsRNU6 gene in Genbank is LOC4332833, and the login number of the nucleotide sequence of the OsRNU6 gene in Genbank is LOC4332833. RNA-seq is utilized to discover that the OsRNU6 shows response to the external nitrogen supply level, and fluorescent quantitative PCR (Polymerase Chain Reaction) proves that the OsRNU6 is induced by low nitrogen. The OsRNU6 is knocked out, so that the nitrogen absorption rate, plant height, tillering and yield of the rice are reduced, and the comprehensive performance is that the utilization efficiency of a nitrogen fertilizer is reduced. The function of the OsRNU6 gene for positively regulating the utilization efficiency of the rice nitrogen fertilizer is defined, and a technical route for improving the utilization efficiency of the rice nitrogen fertilizer by increasing the expression of the OsRNU6 in rice is provided.

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 present invention relates to a method for enhanced nitrogen removal from tail water based on a constructed wetland and a constructed wetland system. The method for enhanced nitrogen removal from tail water based on a constructed wetland includes: arranging a denitrification nitrogen removal area and an aerobic carbon reduction area between the water inlet area and the water outlet area of the constructed wetland, and the denitrification nitrogen removal area is provided with a mixed filler layer; diluting the anoxic sludge and introducing it into the water inlet area, the denitrification nitrogen removal area, the aerobic carbon reduction area and the water outlet area of the constructed wetland to achieve the first-stage biofilm formation treatment; introducing the tail water into the water inlet area, the denitrification nitrogen removal area, the aerobic carbon reduction area and the water outlet area of the constructed wetland to achieve the second-stage biofilm formation treatment; introducing the tail water into the water inlet area, the denitrification nitrogen removal area, the aerobic carbon reduction area and the water outlet area of the constructed wetland until the total nitrogen removal rate in the tail water reaches the standard and then discharging it. The present invention also provides a constructed wetland system. The present invention solves the problems of low nitrogen removal efficiency of the traditional constructed wetland for the tail water of urban sewage treatment plants and still relatively high total nitrogen concentration in the effluent water quality.

The invention provides application of a ZmARF4 gene in construction of low-nitrogen-resistant corn. After the ZmARF4 gene in the corn is knocked out, the corn has a more developed root system, a higher nitrogen absorption speed and a higher total nitrogen content under a low-nitrogen condition. The application of the application provides a new direction and material for breeding of corn low-nitrogen-resistant varieties.

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 discloses a pulverized coal selective oxygen group alkylation modification method, which starts from fire coal, and changes the molecular configuration of pulverized coal through a mechanical force chemical coupling alkylation reagent selective modification method, thereby influencing the migration and conversion path of fuel nitrogen in raw coal, realizing the directional regulation and control of the nitrogen-containing product of the fire coal, enhancing the homogeneous and heterogeneous reduction of NOx, and improving the combustion efficiency. And finally, ultra-low nitrogen emission of the fire coal is realized.

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 low-nitrogen burner mainly comprises a low-nitrogen burner main body, an overhauling operation mechanism and a passing liquid discharging mechanism, the burner main body comprises an outer-layer gas gun, a gas-liquid flow dividing combined spray gun and a barrel, the gas-liquid flow dividing combined spray gun is provided with a liquid collecting groove, and the barrel is provided with a liquid outlet; the maintenance operation mechanism achieves lifting maintenance of burner components through a lifting motion module, worm and gear transmission and a locking component are adopted to ensure stability and quick disassembly, and the liquid passing discharging mechanism automatically opens a liquid discharging pipe to discharge liquid when liquid in a liquid collecting tank is excessive through the linkage design of a floating ball, a lever arm and a blocking spring. The burner is automatically closed after the liquid level is lowered, nitrogen oxides are prevented from exceeding the standard due to the fact that gas carries liquid for the second time, the burner has the functions of convenient maintenance and automatic liquid drainage, and the maintenance efficiency and the environmental protection performance are effectively improved.

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 application of indica DNR1 allele in improvement of nitrogen utilization efficiency and yield of rice under the condition of atmospheric CO2 concentration increase. The promoter sequence of the gene DNR1 is as shown in SEQ ID NO. 2. A field open type atmosphere CO2 concentration increasing test shows that the yield increasing effect of indica rice in response to atmosphere CO2 concentration increasing is obviously higher than that of japonica rice. Therefore, the indica DNR1 has important application potential in improving the nitrogen utilization efficiency and yield of plants in a high CO2 environment. The invention provides important theoretical basis and gene resources for cultivating challenges adapting to current low nitrogen utilization efficiency and high CO2 in future agriculture.

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 low-nitrogen burner, which belongs to the technical field of kiln burners and is characterized in that turbulent flow is formed in a first vortex mixing area and a second vortex mixing area due to impact of various hot air flows in different directions, and combustible gas and combustion-supporting air are premixed by the turbulent flow; the combustion air and the fuel gas are fully mixed in the third main fire mixing area and enter the third main fire combustion area, so that the combustion reaches a flameless combustion state, the third main fire combustion area is a full combustion area with the highest flame temperature in the three combustion areas, but the combustion air and the fuel gas supplied by the first-stage combustion area and the second-stage combustion area are limited, so that the combustion effect is greatly improved. In an incomplete combustion state, the flame temperature is low, it is guaranteed that the first two stages cannot be fully combusted, the flame temperature is low, and the condition of generating nitric oxide is not met, although the flame temperature of the third stage is high, mixing is sufficient, the air-fuel ratio is accurate, fuel is preferentially fully combusted, all oxygen is consumed, nitrogen still cannot be oxidized under the high-temperature and oxygen-deficient conditions, and the combustion efficiency is improved. And therefore, the low-nitrogen combustion process is realized.

The utility model provides gas pressure broadband stable work and low nitrogen emission heat energy equipment and an adjusting device, which comprises a combustion module, a heat exchange module, an exhaust fume collecting hood, a fan and a condensation module, the exhaust fume collecting hood is provided with an air inlet and an air door structure, and the air inlet is communicated with an inner cavity of the exhaust fume collecting hood; the air door structure is movably arranged at the air inlet; the gas flow of the air inlet is adjusted according to the gas pressure, and a part of air is introduced through the air inlet to dilute the ratio of the gas to the air in the flue gas, so that the flue gas cannot reach the combustion recovery concentration after entering the condensation module; meanwhile, when the gas flow of the air inlet is increased, the flow of air entering the combustion module is correspondingly reduced, so that flames become stable, flame separation cannot be caused, the phenomenon of unstable combustion is effectively avoided, and the problem that nitric oxide exceeds the standard is solved; in addition, the adjusting device and the heat energy equipment using the adjusting device can achieve broadband stable work under different gas pressure working conditions.

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.