532 results about "NOx" patented technology

The invention discloses a coal-fired unit SCR denitration system ammonia injection prediction control method based on data driving, which is used for realizing better SCR denitration system ammonia injection control based on a data driving model in combination with an implicit generalized prediction control algorithm. The SCR inlet NOx concentration and the flue gas temperature serve as feedforward of an ammonia spraying amount instruction, the initial control instruction increment of the ammonia spraying amount is calculated through the SCR outlet NOx concentration, the SCR outlet NOx concentration set value and the ammonia spraying amount instruction at the previous moment through an implicit generalized predictive control algorithm, and the final ammonia spraying amount instruction is obtained through summation and amplitude limiting of the last three instructions. Wherein the feedforward instruction of the NOx concentration of the SCR inlet is obtained by a BP neural network prediction model, and the feedforward instruction of the SCR inlet is obtained by a long-short term memory network prediction model fused with an attention mechanism. According to the method, the problem that the concentration of NOx at an SCR outlet fluctuates severely in the frequent load changing process can be effectively solved, meanwhile, transient overshoot of NOx in tail flue gas of a coal-fired unit is restrained, and the SCR denitration control effect is improved.

The invention provides an atmospheric fine particulate matter and ozone optimization control method, and relates to the technical field of environmental control, and the method comprises the steps: collecting the mass concentration of PM2.5 and O3 of a target city, an emission reduction policy and precursor emission data of each pollution source; dividing the target city into a VOCs control area and a VOCs and NOx cooperative control area according to the ozone sensitivity; based on an EKMA curve, obtaining an optimal emission reduction proportion of a precursor of each control region; calculating the control potential of different pollution sources VOCs and NOx of the target city, and establishing an O3 concentration optimization control constraint equation set; calculating PM2.5 sensitivities of different areas of the target city to the receptor points, dividing the target city into a plurality of grade sensitive areas, and establishing a PM2.5 optimization control constraint equation set; and solving the equation set to obtain an O3 and PM2.5 optimization emission reduction scheme. According to the invention, a refined PM2.5 and O3 pollution emission reduction scheme is provided from the city scale.

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 heavy duty vehicle pollutant emission correction method in a plateau environment, a storage medium and a PEMS, and the method comprises the steps: obtaining the plain PEMS emission data of a heavy duty vehicle, calculating the specific emission, calculating the window specific emission of NOx in the plateau environment according to the specific emission of the plain NOx, calculating the window specific emission of PN in the plateau environment according to the specific emission of the plain PN, and calculating the window specific emission of the PN in the plateau environment according to the window specific emission of the PN in the plateau environment. The plateau environment comprises correction factors such as altitude, environment temperature, fuel injection quantity, carbon loading quantity, exhaust temperature, exhaust flow, accumulated positive altitude increment and the like. Through verification, the correction method provided by the invention can more accurately estimate the pollutant emission condition in the plateau environment, so that the test efficiency and accuracy are improved.

The invention discloses a catalytic combustion auxiliary preheating ammonia-hydrogen engine system and an operation method, the catalytic combustion auxiliary preheating ammonia-hydrogen engine system comprises an ammonia decomposition system, a NOx decomposition system, an ammonia-hydrogen engine, a flameless combustion system, an air source and an ammonia gas source, a preheating cooling cavity rapidly heats the inner wall surface of a combustion cavity to reach the temperature required by flameless combustion; tail gas generated by combustion further preheats all parts of the ammonia decomposition system and the NOx decomposition system, the response speed in the starting stage is increased, and in the normal operation stage, high-temperature combustion tail gas generated by flameless combustion is sequentially introduced into the heating cavity and the combustion tail gas heat supply cavity to heat the ammonia decomposition cavity so as to decompose ammonia gas in the ammonia decomposition cavity into hydrogen, and the hydrogen is converted into nitrogen; and the NOx decomposition cavity is heated to decompose NOx in the tail gas of the engine into NO, the combustion-supporting mixed gas is preheated through the preheating cooling cavity and then sprayed into the combustion cavity, the combustion-supporting mixed gas is mixed with ammonia gas for flameless combustion, and flameless combustion is further assisted.

The invention discloses a flue gas low-temperature denitration treatment device for environmental protection, and relates to the technical field of flue gas low-temperature denitration treatment. Comprising a shell, a rotating block is installed at the top end of the shell through a motor, a sleeve is arranged on the surface of the rotating block in a limiting sliding mode, an airflow adjusting assembly is installed at the top end in the sleeve, and a first through plate is installed on the inner wall of the shell and located below the sleeve. According to the invention, through the arrangement of the sleeve, the adjusting plate, the first through plate and the gas flow adjusting assembly, the flow velocity of gas in the shell can be increased, and the uniform distribution of flue gas in the denitration reactor is ensured, so that the full contact of atomized ammonia gas in a reducing agent and nitrogen oxides (NOx) in the flue gas is facilitated, and the phenomenon that the local concentration is too high or too low is reduced; the flow velocity of the flue gas is kept consistent, so that local temperature fluctuation or reactant retention time difference caused by uneven flow velocity can be avoided, and the denitration reaction is ensured to be carried out under the optimal condition.

There is provided a method for nitrogen oxide (NOx) synthesis, the method comprising: - providing a gas mixture comprising oxygen and nitrogen in a plasma reactor chamber; and - exciting the gas mixture into plasma in the plasma reactor chamber, wherein a duration of the excitation is in the range ≥0.15 / P nanoseconds & ≤90 / P nanoseconds, wherein P is pressure of the gas mixture in atm, and wherein the gas mixture is provided at a pressure P of ≥ 1.1 atm.

The present invention provides a tangentially fired pulverized coal boiler system with ammonia co-firing and an ammonia co-combustion method, which relates to the technical field of fuel combustion and includes an ammonia / coal powder combustion section and an ammonia burnout zone arranged on the boiler; the ammonia / coal powder combustion section includes a coal powder combustion zone and an ammonia / coal powder combustion zone, and the ammonia / coal powder combustion zone includes corner ammonia / coal powder burners and wall-mounted ammonia burners; when the ammonia co-firing ratio gradually increases, the wall-mounted ammonia burners are put into operation first, and then the corner ammonia / coal powder burners are put into operation; the upper-layer corner ammonia / coal powder burners and / or wall-mounted ammonia burners are put into operation first, and then the lower-layer corner ammonia / coal powder burners and / or wall-mounted ammonia burners are put into operation; by controlling the pulverized coal in the coal powder combustion zone to be in an incomplete combustion state, CO is provided for ammonia combustion in the upper-layer ammonia / coal powder combustion zone, making ammonia easier to burn. A SOFA zone and an SNCR denitration device are arranged above the ammonia burnout zone, which can reduce the emission of NOx.

The invention discloses an AI intelligent efficient flue gas denitration system process, and belongs to the technical field of flue gas denitration. Comprising the following steps: S1, temperature data acquisition and modeling; s2, simulating and predicting a hearth temperature field; s3, AI prediction control and optimization are carried out; s4, spray guns are arranged in a layered mode and accurately controlled; s5, carrying out closed-loop monitoring and adjustment on NOx; and S6, performing dynamic adaptive optimization operation. A hearth temperature field and flue gas characteristic data can be collected in real time, and a high-precision three-dimensional temperature model is established; the AI algorithm is used for temperature prediction and injection strategy optimization, and full-working-condition dynamic self-adaptive control is achieved; the SNCR denitration efficiency is improved to 70%-85%, NOx emission is effectively reduced, and ammonia escape is controlled within a safe range.

The invention relates to the technical field of industrial flue gas purification, in particular to a method for removing NOX in flue gas through cooperation of iron-extracted and depleted molten lead-zinc slag desulfurization tail liquid and an oxidizing agent, and the method comprises the following steps that S1, iron-extracted and depleted molten lead-zinc slag is ground till the particle size is not larger than 0.075 mm, water is added according to the solid-to-liquid ratio of 1: 200 g / mL, and ore pulp is prepared; s2, flue gas containing SO2 is introduced into the ore pulp, and SO2 in the flue gas is removed; s3, raising the temperature of the desulfurization tail liquid from which SO2 is removed to 25-65 DEG C, adding an oxidizing agent, introducing NOX-containing flue gas, and removing NOX in the flue gas; according to the method, the nitric oxide can be effectively removed by utilizing the desulfurization tail liquid of the molten lead-zinc slag after iron extraction and dilution, so that the comprehensive utilization of resources is realized.

The invention provides a dual-fuel low-nitrogen combustor. The dual-fuel low-nitrogen combustor comprises a central ignition unit, a premixing air duct, a fuel distribution unit and a combustion-supporting air distribution unit. The premixing air cylinder comprises an outer cylinder, a center hole and n premixing cylinders. The center ignition unit penetrates through the center hole, and the n premixing barrels are distributed on the periphery of the center air pipe in an array mode along the circumference, so that the whole fire outlet interface of the premixing air barrels is fully utilized, the uniformity and stability of flames are improved, and generation of nitric oxide is reduced. The fuel distribution barrel is divided into four cavities through axial front-back separation and radial inner-outer separation, the structure is compact, and fuel can be evenly and stably distributed to all the injection pipes. According to the invention, two fuels with high and low calorific values can be adopted, and the two fuels do not interfere with each other, operate independently, can be used at the same time and can also be used independently, so that the selectivity of the fuels is relatively wide. The flame structure can be kept the same, and application occasion adaptability is improved.

The invention relates to the technical field of thermal power plant denitration, in particular to a thermal power plant SNCR (selective non-catalytic reduction) process based on CFD (computational fluid dynamics) simulation for building a physical geometric model of a cyclone separator, optimizing parameters such as injection flow, injection speed and nozzle distribution to realize optimal mixing uniformity and denitration efficiency, and determining that the optimal ammonia nitrogen ratio NSR of SNCR is equal to 1.25 when the SNCR reaction temperature is 972 DEG C; by simulating four injection source arrangement schemes, the optimal injection source position is determined, the optimal mixing uniformity and denitration efficiency and the lowest ammonia escape amount are achieved, the denitration efficiency of the optimized cyclone separator SNCR denitration system reaches 81.2%, emission of NOx in pellet flue gas is effectively reduced, pollution to the environment is effectively reduced through the optimized injection scheme, and the economic benefits of the cyclone separator SNCR denitration system are improved. And the optimal injection source position is determined, the actual engineering error value after transformation is smaller than 0.03, and the environment-friendly requirement for flue gas emission is met.

The invention discloses a method for staged purification of furnace sealing flue gas of a pre-pumping pump and collaborative removal of pollutants, relates to the field of metallurgical industry, and aims to solve the problems of poor adaptation of fixed parameters, complex multi-pollutant treatment system and high energy consumption cost in the prior art. Detecting parameters in real time and regulating and controlling the injection amount and turbulent flow velocity of the modified quicklime powder to finish pretreatment; then entering a primary purification tower, dynamically optimizing the spraying liquid-gas ratio and the electrostatic voltage, and removing SO2 and dust in a targeted manner; then, through a secondary reaction tower, the ozone generation amount and the modified activated carbon injection amount are accurately controlled, and NOx and VOCs are synergistically and deeply removed; and finally, detecting the pollutant concentration through a tail end refining device, and realizing closed-loop emission in combination with standard judgment and a reflux mechanism. Dynamic matching of process parameters and flue gas working conditions is achieved, multiple sets of independent equipment are not needed, it is guaranteed that emission stably reaches the standard, and economical efficiency and practicability are outstanding.

The utility model belongs to the technical field of flue gas denitration purification, and particularly relates to a coal-fired boiler SCR denitration ultra-low emission device which comprises an SCR layer, a first-stage economizer, a gas flow uniform distribution device, a second-stage economizer and an ammonia water / urea solution tank, and is characterized in that the ammonia water / urea solution tank is communicated with a pyrolysis gasification device; the pyrolysis and gasification device is connected with an ammonia spraying grid through an air duct, the ammonia spraying grid is arranged in a flue behind the first-stage economizer, the pyrolysis and gasification device is sequentially connected with heat exchange equipment I and heat exchange equipment II through pipelines, and the heat exchange equipment II is arranged in a flue behind the second-stage economizer or a flue behind the SCR layer; and the pyrolysis gasification device is communicated with a compressed air pipe. The NOx-containing flue gas purification device can efficiently purify NOx-containing flue gas, and is reliable in operation, low in investment and operation cost, long in service life and free of secondary pollution.

The invention provides a nitric acid production method with tail gas circulation. The method comprises the following steps: enriching feed air to form oxygen-enriched gas, and mixing the oxygen-enriched gas with high-pressure tail gas absorbed by a nitric acid absorption tower to obtain mixed gas; mixing the preheated mixed gas in the reactor with the gasified ammonia raw material, and oxidizing or reducing nitrogen oxides in the tail gas into NO2, N2O5 and N2; recovering high-grade heat in the process gas at the outlet of the reactor; process gas is subjected to gas-liquid separation, a gas phase is subjected to heat exchange, and a liquid phase enters a nitric acid absorption tower and faces a concentration tower plate. According to the method, unit consumption and energy consumption in the nitric acid production process can be reduced, NOx in tail gas emission is reduced, and the investment and operation cost in the nitric acid production process is reduced.

The invention relates to a natural gas hydrogen-doped low-nitrogen burner for a boiler, belongs to the technical field of burners, and aims to overcome the defect that an existing burner is excessive in pollutant emission in the using process. The natural gas hydrogen-doped low-nitrogen burner comprises a main burning nozzle, a sleeve and a micro-mixing on-duty nozzle, the sleeve and the micro-mixing on-duty nozzle are of a sleeved structure, and a combustion-supporting channel is formed between the sleeve and the micro-mixing on-duty nozzle; the multiple main combustion nozzles are distributed in the circumferential direction of the sleeve, first premixing cavities used for mixing fuel gas and flue gas are formed in the main combustion nozzles, the sleeve guides air into the combustion-supporting channel and the micro-mixing on-duty nozzles, and second premixing cavities of fuel gas cavities and air cavities are formed in the micro-mixing on-duty nozzles. An air outlet and a second premixing cavity communicated with the air cavity are machined in the end face of the cylinder, the upstream of the unit micro-mixing spray pipe is located in the air cavity, the downstream of the unit micro-mixing spray pipe is located in the second premixing cavity and communicated with the gas cavity, and an igniter is installed in the air outlet. According to the invention, the peak temperature and speed of flame are effectively reduced by enhancing mixing, so that the generation of NOx is inhibited.

The nested multi-nozzle ammonia-coal dual-fuel flameless burner comprises a tapered high-temperature oxidant spray pipe 1, an ammonia gas preheating chamber 2, a pulverized coal preheating chamber 3, a pulverized coal spray pipe 4 and an ammonia gas spray pipe 5, the tapered high-temperature oxidizing agent spraying pipe 1 penetrates through the pulverized coal and ammonia gas spraying device and is used for conveying secondary air, the ammonia gas preheating chamber 2 is coaxially assembled on the outer side of the tapered high-temperature oxidizing agent spraying pipe 1, the pulverized coal preheating chamber 3 is coaxially assembled on the outer side of the ammonia gas preheating chamber, the pulverized coal spraying pipe 4 is used for conveying primary air and pulverized coal, and the ammonia gas spraying pipe 5 is used for conveying NH3. On the basis of the outer spraying type nozzle structure of outer side coal spraying and inner side ammonia spraying and the spraying mode that the outer side deviates from oxidizing agent jet flow, NOx generated in ammonia coal flameless combustion can be remarkably reduced.

The invention discloses a low-load flue gas recirculation system for a circulating fluidized bed boiler. The low-load flue gas recirculation system comprises a hearth, and one end of a fifth pipeline is fixedly connected to the hearth; according to the invention, a part of flue gas is led out from the opening of the outlet flue of the induced draft fan and is introduced into the fourth pipeline, primary air heated by the first fan heater and the second fan heater is mixed, then pressurized by the first primary air fan and the second primary air fan and heated by the first preheater and the second preheater, and then enters a boiler air chamber; a dynamic parameter adjusting mechanism in the self-adaptive adjusting system adopts a feedforward-feedback composite control structure, the reheating steam temperature can be increased by about 2 DEG C every time the recirculation air volume is increased by 1%, the NOx concentration fluctuation is predicted in real time by applying an LSTM neural network, PID parameters are dynamically corrected through fuzzy reasoning, fuel characteristic changes are adapted, and the reheating steam temperature is increased by about 2 DEG C; and the amount of recycled flue gas is properly adjusted according to the load change to ensure that the unit is in the deep peak regulation load interval, and the unit operates to realize stable ultralow emission of NOx.

The invention provides a low-emission and wide-load coal-fired boiler system based on wall-type wind and ammonia-doped combustion, and the system comprises a combustion environment sensing module which is used for deploying a sensing equipment network and obtaining basic combustion characteristic parameters; the combustion state recognition module is used for carrying out flame stability index extraction, combustion trend prediction and fuzzy reasoning to obtain real-time working condition characteristics; the wall type wind configuration module is used for designing a wall type wind jet flow CFD simulation model and obtaining wall type wind optimal configuration parameters; the differential ammonia doping module is used for constructing an ammonia combustion chemical kinetic model and a three-dimensional mapping query table to obtain a differential graded ammonia doping scheme; the collaborative optimization module is used for comprehensively optimizing the wall type wind optimal configuration parameter differentiation grading ammonia doping scheme; and the performance evaluation module is used for comprehensive performance evaluation and equipment prediction maintenance. According to the invention, environmental data in the boiler can be sensed comprehensively, ultralow emission of pollutants such as NOX and the like is realized, the boiler is kept stable and reaches the standard under large-load fluctuation, and the safety, economic and environment-friendly values of boiler operation are improved.

The invention belongs to the technical field of clean combustion, and particularly relates to a pulverized coal dense-thin separation and ammonia gas jet flow large-angle reverse blowing direct-current burner and a combustion system, and the direct-current burner comprises an ammonia gas channel, a burner channel and a pulverized coal dense-thin separator; the pulverized coal dense-thin separator is arranged in the combustor channel; the output end of the combustor channel is a thick-thin primary air nozzle, and a separator is arranged in the middle of the thick-thin primary air nozzle; an included angle is formed between the axis of the concentrated-phase primary air back-blowing nozzle and the axis of the combustor channel; the ammonia gas channel is arranged on the side edge of the combustor channel and is arranged close to one side of the concentrated-phase primary air back-blowing nozzle; the output end of the ammonia gas channel is an ammonia gas back-blowing nozzle which forms an included angle with the axis of the combustor channel; the included angle between the ammonia gas back-blowing nozzle and the axis of the combustor channel is larger than the included angle between the axis of the concentrated-phase primary air back-blowing nozzle and the axis of the combustor channel. Compared with the prior art, the problem that a large amount of NOx is easily generated during ammonia-doped combustion of pulverized coal is solved. According to the scheme, ammonia combustion is converted into hydrogen combustion, and high combustion efficiency and environmental protection performance are both considered.

The utility model relates to sulfur recovery tail gas incineration equipment which comprises a shell and a flame path located in the shell, the tail end of a fuel gas conveying pipeline used for providing fuel gas for the equipment is connected with a first conveying branch pipe and a second conveying branch pipe, and the first conveying branch pipe is connected with a main fuel gas inlet of a fuel spray gun. The main fuel gas is fed into the flame path through a fuel spray gun penetrating through the shell to enter the flame path inlet; the second conveying branch pipe is connected with a secondary fuel gas inlet in the shell, and secondary fuel gas is conveyed into the tail gas cavity to be mixed with tail gas through a distribution component in the secondary fuel gas inlet. And a flow regulating valve is arranged on the first conveying branch pipe or the second conveying branch pipe. Part of fuel gas and tail gas are mixed, the combustion efficiency of the tail gas in the hearth is improved, CO is reduced, and the concentration of pollutants in the tail gas is remarkably reduced. Fuel in the flame path is reduced, the combustion flame temperature is low, and generation of thermal NOx during combustion can be effectively controlled.

The invention discloses an intelligent carbon dioxide capture and separation integrated system, which relates to the technical field of carbon dioxide capture and separation, and comprises a gas inlet pretreatment module, a carbon dioxide capture module, a carbon dioxide separation module, an intelligent control system and a gas outlet treatment module, the system is characterized in that the inlet gas pretreatment module is used for pretreating mixed gas containing carbon dioxide. According to the intelligent carbon dioxide capture and separation integrated system, by arranging the gas inlet pretreatment module, impurities in mixed gas can be effectively removed, most particulate matter in the mixed gas is separated through cyclone centrifugal separation, and the filtering area of a folded filter element is greatly increased compared with that of a traditional filter element; honeycomb-shaped activated carbon is filled in activated carbon adsorption, acid gases such as SO-NOx and the like are removed, dust removal and gas removal functions are integrated, the influence of impurities on subsequent trapping and separation processes is avoided, and the stability and the reliability of the system are improved.

The invention relates to a method for onboard monitoring of emissions in a commercial vehicle, wherein the method is implemented in an electronic control unit of the commercial vehicle, wherein a calculation of a moving average of an emission species is performed, wherein a plurality N of accumulators (ΣNOX) are used to accumulate emission values ​​from an input vector (NOXtp, NH3tp) detected during the journey of the commercial vehicle, wherein a first accumulator (ΣNOX) accumulates the emission values ​​of the input vector (NOXtp, NH3tp) from the beginning of a journey until the work (W) performed by the commercial vehicle since the beginning of this accumulation corresponds to a predetermined reference work (W_ref), wherein after each Nth of the reference work (W_ref) a further accumulator (ΣNOX) accumulates the emission values ​​of the input vector (NOXtp, NH3tp).until the work (W) performed by the commercial vehicle since the start of this accumulation corresponds to the specified reference work (W_ref), wherein the emission values ​​(NOX MAW) accumulated by the accumulators (ΣNOX) are categorized into a vector (V) which has a number of elements with emission value ranges (EWB) with associated emission value frequencies (EWH), wherein a sorting process is applied to the vector (V) to determine the hundredth and ninetieth percentiles (P90, P100) for each trip.

The invention relates to the technical field of air pollution control, in particular to an air pollution denitration and desulfurization tail gas purification method which comprises the following steps: rotational flow spray desulfurization (adopting nanoscale composite absorbent slurry to efficiently absorb SO2 and remove particulate matters in a rotational flow reactor), two-stage catalytic denitration (using a nano-catalyst to promote NOx reduction in a low-temperature region, and using a high-temperature catalyst to remove the particulate matters in a low-temperature region). In the high-temperature area, a vanadium-tungsten-titanium-based catalyst is loaded through a novel honeycomb ceramic carrier to strengthen the reaction), deep collaborative purification is carried out (residual pollutants and aerosol are further removed by utilizing electrostatic precipitation and oxidative adsorption coupling), and an intelligent regulation and control system is used for optimizing the ratio of an absorbent, the temperature of the catalyst and flow velocity parameters in real time. According to the method, the problems of catalyst poisoning, high energy consumption and insufficient treatment efficiency in a traditional process are solved through a nano material modified absorbent, a temperature gradient catalytic reaction and a multi-pollutant synergistic removal mechanism. The desulfurization efficiency of the system is greater than or equal to 98%, the denitration efficiency is greater than or equal to 97%, the particulate matter emission is less than or equal to 10mg / m < 3 >, the SO2 is less than or equal to 35mg / m < 3 >, and the NOx is less than or equal to 50mg / m < 3 >

The invention discloses a large power station boiler inferior coal low-nitrogen combustion optimization control system and method based on machine learning and multi-objective optimization, and relates to the technical field of coal-fired power generation and clean combustion control. The control system is composed of a combustor subsystem, a detection subsystem and a control subsystem, the combustor subsystem constructs a subarea air supply structure with stable combustion at the bottom layer, low nitrogen at the middle and upper layers and burnout at the upper part through layered combustors and OFA nozzles, and the detection subsystem completes online monitoring of coal quality and online analysis of combustion state parameters; and the control subsystem comprises coal quality adaptive decision, multi-objective optimization and closed-loop feedback. According to the control method, inferior coal is recognized through machine learning, layered air distribution is activated in a self-adaptive mode, the optimal air volume and the rotational flow angle are optimized and solved online with efficiency and NOx as multiple targets, and finally precise execution and fine adjustment are conducted through closed-loop feedback. According to the invention, wide-load stable combustion, continuous low NOx level and burnout degree improvement can be realized, and the method is suitable for engineering application of combustion of inferior coal in a large-scale unit.

The low-CO burner for the low-temperature furnace comprises a burner box body, a central auxiliary air gun, a side main air gun and a flame-fixing high-strength flame path brick, the flame-fixing high-strength flame path brick is arranged on a connecting plate at the top of the burner box body, the central auxiliary air gun enters an air channel in the flame-fixing high-strength flame path brick, and the side main air gun enters an air channel in the flame-fixing high-strength flame path brick. The top of the air channel is connected with a flame stabilizing ring groove through an arc necking opening, lateral taper holes are evenly distributed in the circumferential direction of a guide slope at the outer top of the flame-fixing high-strength flame path brick and incline upwards from outside to inside, flame stabilizing holes are evenly distributed in the circumferential direction of the flame stabilizing ring groove, and side branch air pipes of the side main air guns penetrate out of the periphery of the flame-fixing high-strength flame path brick. And a side nozzle of the side main air gun is aligned with the lateral taper hole. On the premise of stabilizing flame and reducing generation of NOx, fuel is introduced into the flame path brick, so that fuel gas is quickly mixed with air for combustion, a relatively high combustion area of the fuel is ensured at relatively low hearth temperature, complete combustion of the fuel can be promoted, the heat efficiency of the whole device is improved, and finally generation of CO is reduced.

The invention relates to the technical field of gas separation, and discloses an impurity-interference-resistant low-concentration CO2 pressure swing adsorption purification process which comprises the following steps: S1, adsorption step: introducing raw material gas containing impurities and CO2 into a main adsorption tower filled with a composite adsorbent under adsorption pressure, so that CO2 is selectively adsorbed, and purified tail gas is obtained; s2, regenerating: regenerating the main adsorption tower, namely S2.1, equalizing and reducing pressure: discharging gas in the main adsorption tower, and recovering pressure energy; s2.2, vacuumizing: carrying out vacuum desorption on the main adsorption tower to obtain a CO2 product gas; the composite adsorbent with a gradient structure is adopted, a hydrophobic shell of the composite adsorbent effectively blocks water erosion, and acidic impurities such as SOx and NOx are preferentially and chemically fixed on an inner layer, so that high-selectivity adsorption of a core amino site to CO2 is protected, and the poisoning resistance and long-term stability under complex flue gas conditions are remarkably improved.

The invention discloses an outer-thick inner-thin pulverized coal center ammonia-mixed low-nitrogen burner, relates to the technical field of burners, and solves the problems of non-flammable ammonia and high NOx emission concentration in ammonia-doped combustion of a pulverized coal boiler. The device comprises a primary air pipeline, a secondary air ring cavity, a bluff body and a central ammonia gas pipe, the central ammonia gas pipe is slidably arranged on the primary air pipeline, the gas outlet end is arranged in the center in the primary air pipeline, and the gas inlet end is arranged outside the primary air pipeline; an air distribution disc is arranged at the gas outlet end of the central ammonia gas pipe, and a telescopic mechanism and an ammonia gas adjusting valve are arranged at the gas inlet end; a plurality of bluff bodies are arranged on the central ammonia gas pipe, and the sections of the bluff bodies are trapezoidal; a Venturi tube is arranged in the primary air pipeline, a combustion stabilizing ring is arranged at the air outlet end, and a secondary air ring cavity is coaxially formed in the outer side of the primary air pipeline. The ammonia gas is directly utilized in the form of fuel, meanwhile, the pulverized coal is combusted together with the ammonia in the mode that the pulverized coal is thick outside and light inside, so that the combustion state is stabilized, the burn-off rate of the ammonia gas is high, and the emission concentration of NOx in the combustion process is low.

The present application relates to the technical field of combustor, in particular to a kind of low-nitrogen combustor of roasting furnace natural gas based on cyclone and staged combustion, solve the problem that more nitrogen oxides can be produced in the combustor in the prior art;It includes outer sleeve, inner sleeve and inner core tube, the outer sleeve is sleeved on the outside of inner sleeve, air flow channel is formed between the outer sleeve and inner sleeve, the inner core tube is connected to the inside of inner sleeve, the inner sleeve is formed with natural gas flow channel through inner core tube, the inner wall of outer sleeve is formed with first rifling, the inner wall of inner sleeve is formed with second rifling, spiral groove is formed on the inner core tube and penetrates both ends;The scheme utilizes multiple rifling structures to make air and gas produce cyclone, improve mixing effect, enhance the radiation heat transfer effect of combustion in the furnace on furnace wall, increase the thermal efficiency of equipment, reduce energy waste, compared with conventional direct injection type combustor, NOx is reduced by 40.7%, and flame length is nearly 2 times of conventional direct injection type.

The invention relates to the field of low-temperature plasma catalyst preparation, and discloses a composite catalyst as well as a preparation method and application thereof. The composite catalyst comprises a carrier as well as manganese oxide, an auxiliary active component and a heat stabilizer which are loaded on the carrier, the auxiliary active component is transition metal oxide, and transition metal is selected from at least one of Cu, Co and Ce; the carrier is selected from one or two of alpha-Al2O3, gamma-Al2O3, eta-Al2O3, a high-silicon Y type molecular sieve, a ZSM-5 type molecular sieve and an MCM-41 type molecular sieve; and the heat stabilizer is selected from one or more than two of La oxide, Nd oxide and Pr oxide. The composite catalyst is coupled with a low-temperature plasma technology, dual control over VOCs and by-products NOx and ozone can be achieved, the degradation efficiency of the VOCs can be improved, meanwhile, emission of the by-products can be reduced, and green treatment of the VOCs is achieved.