840 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 discloses a method and a system for evaluating the pollution reduction and carbon reduction collaboration degree in the coal-fired power generation industry based on online monitoring data, related pollutants are typical atmospheric pollutants, and carbon emission particularly refers to carbon dioxide emission. The method comprises three parts: a subsystem for acquiring and preprocessing data of single atmospheric pollutants such as SO2, particulate matters and NOx, a subsystem for accounting the cooperation degree of single atmospheric pollutants and carbon emission reduction in the coal-fired power generation industry, and a subsystem for comprehensively accounting pollution and carbon reduction indexes in the coal-fired power generation industry. According to the method, the typical representative coal-fired power generation enterprise level data in the region is processed and integrated to evaluate the pollution reduction and carbon reduction level of the coal-fired power generation industry in the region range.

The invention relates to the technical field of denitration and ammonia spraying, in particular to an intelligent denitration and ammonia spraying automatic control system and method for a thermal power coal-fired unit, and the system comprises a control module which is used for controlling and monitoring the whole denitration process; the data analysis and prediction module is used for analyzing by utilizing historical data and real-time data, predicting NOx concentration change and providing decision support for ammonia injection control; the balancing module is responsible for accurately controlling and optimizing the ammonia spraying amount; the monitoring and feedback module is used for monitoring the concentration of NOx and ammonia escape in real time and providing a feedback signal for the control system; and the communication module is responsible for data transmission between the denitration control system module and the DCS program. The method has the beneficial effects that the time stability and the space uniformity of NOx at an SCR outlet are improved through an intelligent feed-forward algorithm and an override algorithm, excessive ammonia spraying is reduced by utilizing an ammonia escape correction system, the ammonia escape rate is effectively reduced, the operation reliability of a unit is improved, and the resistance increase of a flue gas system caused by blockage of an air pre-heater is reduced.

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.

System for determining the amount of sludge added to the boiler based on a coupled neural BP network, characterized in that it comprises the following: a creation module for the networked model of the combustion chamber, which serves to obtain a detailed structure of the denitrification system and the desulfurization system in the boiler, and to create a networked model of the combustion chamber based on the detailed structure of the denitrification system and the desulfurization system; a measurement module for the temperature field of the combustion chamber, which serves to create a relevant model for different coal qualities in the combustion chamber according to the networked model of the combustion chamber and in combination with the real-time data of the denitrification system and the desulfurization system, and to introduce CFD simulation values ​​into the relevant model and to simulate in order to obtain a temperature field of the combustion chamber; a denitrification efficiency acquisition module that serves to combine the detailed structure of the denitrification system with the temperature field of the combustion chamber and to obtain the denitrification efficiency and the NOx emission index within the framework of the 3D model; a measurement module for desulfurization efficiency, which serves to combine the detailed structure of the desulfurization system with the temperature field of the combustion chamber and to obtain the desulfurization efficiency and the SO2 emission index within the framework of the 3D model; a NOx dosing quantity module that serves to obtain the criterion for the minimum NOx emission value during boiler denitrification and the critical criterion for the NOx emission value with increasing sludge dosing quantity based on the denitrification efficiency and the NOx emission index within the framework of the 3D model, and to compare the different temperatures of the boiler chamber with the criterion of the minimum NOx emission value and the critical criterion of the NOx emission value with increasing sludge dosing quantity and to obtain the maximum regulated sludge dosing quantity corresponding to the NOx emission value; an SO2 dosing quantity module, which serves to obtain the criterion for the minimum SO2 emission value during the denitrification of the boiler and the critical criterion for the SO2 emission value with increasing sludge dosing quantity based on the desulfurization efficiency and the SO2 emission index within the framework of the 3D model, and to compare the different temperatures of the boiler chamber with the criterion of the minimum SO2 emission value and the critical criterion of the SO2 emission value with increasing sludge dosing quantity, and to obtain the maximum regulated sludge dosing quantity corresponding to the SO2 emission value; a model processing module that serves to train the maximum regulated sludge dosing quantity corresponding to the NOx emission value and the maximum regulated sludge dosing quantity corresponding to the SO2 emission value through a neural BP network and to obtain the maximum sludge dosing quantity of the boiler.

A system includes an aftertreatment system and a controller coupled to the aftertreatment system. The controller is configured to generate a spatially resolved model of a catalyst of the aftertreatment system. The controller is further configured to adjust the spatially resolved model based on one or more sensed values from at least one sensor upstream of the one or more portions and at least one sensor downstream of the one or more portions.

The invention belongs to in-situ atmospheric pollution monitoring system with open optical path laser absorption spectroscopy device comprising a high-altitude system of two unmanned aerial vehicles (UAV) and a movable ground system (MGS) carrying a signal receiving and analyzing device, where all systems are interconnected via contactless communication. The optic high-altitude system is interconnected by optical signals both for UAV-I and UAV-II synchronization and for pollution probing purposes, while low power laser radiation is used which saves energy and is not dangerous to different biological species. Invention offers unsurpassed mobility and spatial resolution of measurements of atmospheric gaseous molecular pollutants which detection requires a considerable length of the optical path. The evaluation of emission power and dispersion profile in the pollutant plume at specific meteorological situation is accomplished by use of specialized measurement algorithms and on-line feedback between UAV and MGS. Measurements data can be used for the development of prognostic pollution models over potential CO / CO2 / NOx / CH4 / N2O / SO2 pollution sources.

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 provides a device and a method for producing ammonium nitrate by taking air and water as raw materials. Compared with the prior art, the device is composed of the nitrogen generator, the plasma discharge device, the fixed bed reactor and the absorption tower, sliding arc discharge is adopted, the fixed bed reactor is heated through heat generated by discharge, NH3 and NOx are synthesized through nitrogen and water discharge, and the ammonium nitrate solution is finally obtained through oxidation absorption. According to the method, only air and water are used as raw materials, high-temperature and high-pressure reaction conditions in the industrial ammonium nitrate synthesis process are avoided, the synthesis process driven only by renewable energy sources is realized, and the method can be applied to the scenes of distributed energy storage, small-scale production of agricultural nitrogen fertilizers and the like.

The invention discloses a denitration device and method for reducing low-temperature flue gas catalytic denitration fuel consumption, the denitration device comprises a desulfurization device, a dust remover, an SCR reactor, an induced draft fan and a chimney which are sequentially communicated through flues, and heat exchangers are arranged on the flues at the input end and the output end of the SCR reactor; a heat exchanger is arranged at the input end of the SCR reactor, a hot blast stove and a reducing agent spraying device are sequentially arranged on a flue between the heat exchanger and the input end of the SCR reactor, and a CO oxidation catalyst and a plurality of denitration catalysts located above the CO oxidation catalyst are arranged in the SCR reactor. According to the low-temperature flue gas SCR denitration device, NOx and CO up-to-standard emission of sintering flue gas, steel rolling flue gas and the like which are relatively low in temperature of iron and steel enterprises can be continuously and stably achieved, the requirement of SCR denitration for flue gas temperature rising can be met, fuel consumption of a hot blast stove is reduced, and the low-temperature flue gas SCR denitration operation cost is reduced.

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 relates to the field of waste resource utilization, in particular to a method for preparing biochar through co-pyrolysis of coal-based solid waste and biomass. Through co-pyrolysis of the coal-based solid waste and the biomass, the energy conversion efficiency can be effectively improved. Compared with independent pyrolysis, the interaction between the volatile components of the biomass and the semicoke of the coal in the co-pyrolysis process can promote the pyrolytic reaction, and the heat value of the pyrolysis product is increased, so that the utilization efficiency of energy is improved. According to the method disclosed by the invention, the coal-based solid waste and the biomass are subjected to co-pyrolysis, so that the environmental pollution caused by independently treating the waste is reduced. In the co-pyrolysis process, volatile components of the biomass can catalyze pyrolysis of coal, formation of coke is reduced, meanwhile, emission of pollutants such as CO2, SOx and NOx is reduced, release of chemical components is reduced, and environment friendliness is achieved.

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.

An existing sintering flue gas treatment process additionally provided with a CO removal device is improved, the flue gas purification process and system for synergistically removing multiple pollutants are provided, SO2, NOx, dust and CO are efficiently removed, pollutants such as SO3, HCl, HF and heavy metal can be efficiently and synergistically removed, long-term stable operation of a CO catalyst can be ensured, and the service life of the flue gas purification system is prolonged. And meanwhile, the system stability under different CO concentration fluctuations can be adapted, the CO device can be ensured to operate in a high-efficiency state for a long time, and meanwhile, the effects of saving energy and reducing carbon are achieved.

The invention relates to an intelligent optimization method for reducing pollution and improving efficiency in an urban solid waste incineration process, which improves the flow and stability of main steam, reduces the emission concentration of pollutants such as NOx, SO2, HCl and the like, and reduces the usage amount of a urea solution and limestone slurry at the same time through collaborative operation optimization of multiple process links. Comprising the following steps: firstly, acquiring data; determining input and output, and establishing an operation index model by adopting a fuzzy neural network; secondly, according to the response time of the solid waste incineration link, the waste heat utilization link and the flue gas treatment link, a multi-time-scale operation optimization objective function is established; designing a double-layer multi-target competitive group optimization algorithm, and solving the dynamic collaborative operation optimization problem of the urban solid waste incineration process; and finally, determining an optimal decision according to optimization characteristics of different time scales, and verifying optimization performance by adopting actual urban solid waste incineration process data. According to the method, pollution reduction and efficiency improvement in the urban solid waste incineration process are achieved, and the method has important theoretical significance and application value.

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 embodiment of the invention provides a device for removing NOx in flue gas through CO generated by boiler combustion. The device comprises a carbon dioxide reduction generator, a mixer and SCR denitration equipment. The carbon dioxide reduction generator communicates with the boiler and the mixer. The carbon dioxide reduction generator is used for catalytically reducing carbon dioxide in flue gas desulfurized by the boiler into carbon monoxide; the mixer is used for mixing carbon monoxide generated by the carbon dioxide reduction generator with air; the SCR denitration equipment comprises a denitration flue, and a reducing agent spraying and mixing part and a CO-SCR denitration catalysis part which are arranged in the flue denitration flue; the denitration flue is communicated with the boiler; the reducing agent spraying and mixing part is communicated with the output end of the mixer and is used for supplementing mixed gas of carbon monoxide and air to the denitration flue; and the CO-SCR denitration catalysis part is used for carrying out denitration treatment on NOx components in the flue gas by utilizing the flue gas generated by the boiler and carbon monoxide in the mixed gas supplemented by the mixer.

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 present invention discloses emissions treatment systems for the removal of NOx from exhaust combustion gases comprising, in the following order, from upstream to downstream: a) means for the injection of ammonia or an ammonia precursor solution into the exhaust gas stream, and b) a catalytic device comprising at least one carrier substrate, a material zone A comprising a first V / TiO2 SCR catalytically active composition SCRfirst which comprises at least one oxide of vanadium supported on titanium dioxide, a material zone B comprising a second V / TiO2 SCR catalytically active composition SCRsecond which comprises at least one oxide of vanadium supported on titanium dioxide, wherein the two material zones are affixed to the at least one carrier substrate in such a way that the exhaust gas first comes into contact with material zone A and then with material zone B, and wherein the ratio Vfirst:Vsecond of the percentages of vanadium contained in the first to the second V / TiO2 SCR catalytically active composition, each calculated as V2O5, is from 0.05 to 0.75. Methods for the removal of NOx emissions from exhaust gases of internal combustion engines are also envisaged.

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 relates to a comprehensive utilization major cycle process in cooperative treatment of industrial flue gas pollutants, which comprises the following steps: removing SO2 and NOx in flue gas by adopting an adsorption method, and desorbing SO2 and NOx by adopting a water solution method to generate sulfuric acid and nitric acid; sulfuric acid reacts with sodium chloride to produce hydrochloric acid; sulfuric acid, nitric acid and hydrochloric acid are combined into a composite acid solvent, the solvent dissolves aluminum oxide in the fly ash to be converted into polybasic acid aluminum, the polybasic acid aluminum is subjected to ammonification decomposition into aluminum hydroxide and composite acid ammonium, the composite acid ammonium reacts with calcium carbonate to generate NH3, CO2 and polybasic acid calcium, and the polybasic acid calcium reacts with sodium sulfate to generate nano calcium sulfate; the method comprises the following steps: reacting silicon dioxide with sodium hydroxide to generate sodium silicate, reacting sodium silicate with sodium bicarbonate to generate silicic acid and sodium carbonate, reacting sodium carbonate with calcium hydroxide to generate calcium carbonate and sodium hydroxide, and mixing multi-element metal oxide separated from aluminum and silicon extraction with silicon dioxide and aluminum hydroxide which are separated and carried to prepare a multi-element cation molecular sieve; and comprehensive utilization and large circulation of the flue gas pollutants are realized through the synergistic effect of the pollutants.

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 embodiment of the invention provides a method and system for regulating and controlling the concentration of NOx in flue gas at an SCR inlet of a green ammonia blending burning coal-fired unit, and belongs to the technical field of clean emission. The method comprises the following steps: constructing a corresponding reaction mechanism model of an ammonia gas and coal combustion reaction based on coal-fired unit design information; on the basis of the reaction mechanism model, an optimization problem is constructed with the minimum NOx concentration ratio of the SCR inlet flue gas as a target, a constraint function is added to the optimization problem, and an optimization model is obtained; based on the optimization model and the long-short-term memory network, analyzing the influence degree of each operating parameter of the coal-fired unit on the NOx concentration of the flue gas at the SCR inlet to obtain a NOx concentration prediction model of the coal-fired unit; and based on real-time operation parameters of the coal-fired unit and the NOx concentration prediction model, performing real-time optimization control on the coal-fired unit so as to ensure that the coal-fired unit is discharged at the lowest NOx concentration. According to the scheme, the problems that in a traditional method, ammonia gas flow control is difficult, and NOx concentration fluctuation is large are solved, and therefore the environment-friendly performance and the operation efficiency of a coal-fired unit are improved.

The utility model relates to an SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) collaborative denitration ultra-low emission system for a coal-fired boiler. The system comprises an SNCR denitration unit, a primary economizer, an airflow uniform distribution device, an SCR denitration unit and a secondary economizer, the SNCR denitration unit consists of an ammonia water / urea solution tank, a delivery pump and a spray gun; and the SCR denitration unit comprises an SCR layer. The system disclosed by the utility model is simple and reasonable in structure, reliable in operation, low in investment and operation cost, long in service life and free of secondary pollution, and the NOx-containing flue gas of the coal-fired boiler can be efficiently denitrated and purified.

The invention relates to the technical field of flue gas treatment, in particular to a flue gas desulfurization and denitrification adsorption treatment method which comprises the following steps: measuring the volume ratio x of NOx to SO2 in flue gas; according to the volume ratio x of the NOx to the SO2 in the flue gas and a pre-obtained saturation adsorption curve of the adsorption material to the NOx and the SO2 at different temperatures, determining a flue gas temperature T needing to be controlled; and adjusting the temperature of the flue gas to the temperature T, and performing adsorption treatment on the flue gas by adopting the adsorption material. According to the adsorption treatment method for flue gas desulfurization and denitrification disclosed by the invention, near-zero emission of coal-fired flue gas can be realized while the consumption of the adsorption material is reduced.