695 results about "Selective catalytic reduction" patented technology

The invention relates to an SSZ-39 molecular sieve and preparation and application thereof.The preparation method comprises the following steps that 1, after water, an alkali source and a template agent are mixed, mesoporous Y zeolite and a silicon source are added, the mixture is stirred to be uniform, and the mixture is aged to be in a white gel shape; (2) transferring the obtained white gel into a reaction kettle, carrying out crystallization treatment, and filtering, washing, drying and calcining a crystallized product to obtain a Na-SSZ-39 molecular sieve; (3) carrying out ammonium ion exchange on the Na-SSZ-39 molecular sieve, filtering, washing, drying and calcining to obtain an H-SSZ-39 molecular sieve; and (4) carrying out copper ion exchange on the H-SSZ-39 molecular sieve, filtering, washing, drying and calcining to obtain the Cu-SSZ-39 catalyst. Aluminum used in the method is provided by mesoporous Y zeolite, the pure-phase SSZ-39 molecular sieve can be synthesized in a wide gel range, the crystallization time is shortened to 24 h, and after copper ion exchange, the pure-phase SSZ-39 molecular sieve shows high denitration activity in the selective catalytic reduction reaction of nitrogen oxide ammonia.

The invention provides an ammonia-hydrogen engine aftertreatment device and a control method. The post-treatment device comprises an electric heater, an N2O decomposition catalyst, a selective catalytic reducer, an ammonia trapping catalyst, a sensor and a controller, the electric heater is arranged at the exhaust end of the ammonia-hydrogen engine, is powered and controlled by the controller and is used for heating exhaust of the ammonia-hydrogen engine. An N2O decomposition catalyst, a selective catalytic reducer and an ammonia trapping catalyst are sequentially arranged at the rear end of the electric heater; the sensors comprise three temperature sensors, one NOx sensor and one NH3 sensor; the controller receives a temperature signal of the temperature sensor and controls the working state of the electric heater according to the received temperature signal; and the controller receives the concentration signal of NOx and the concentration signal of NH3, and controls the working state of the electric heater according to the concentration signals. According to the invention, the decomposition efficiency of N2O can be improved, and the conversion efficiency of NOx can be improved.

The invention relates to the technical field of flue gas denitrification, and discloses a flue gas baffle system for an SCR (Selective Catalytic Reduction) denitrification device and a use method.The flue gas baffle system is provided with a control system and a matrix flowmeter, a baffle assembly is composed of a plurality of baffle units, each flue is uniformly divided into a plurality of subareas, and each subarea corresponds to a group of adjusting units; and each baffle unit correspondingly controls one subarea of the cross section, so that the technical effects of automatically detecting the flow field at the inlet of the reactor and automatically adjusting the angle of the baffle under different loads or different flow field conditions are realized, the uniformity of the flue gas flow field under different loads is improved, the adaptability of the SCR denitration device to the loads is improved, and the service life of the SCR denitration device is prolonged. The ammonia escape amount when the load or the flow field changes is reduced, and the technical problem that in the prior art, an SCR denitration device cannot adjust the flue gas flow field according to the incoming flow characteristics of flue gas and cannot adjust the flue gas flow field when the performance of an existing flow equalizing device is damaged is solved.

The invention discloses a system of a belt type roasting machine for denitration by using return hot air, which comprises a return hot air blower, a first heat exchanger, a second heat exchanger, a second heat exchanger, a third heat exchanger, a third heat exchanger, a fourth heat exchanger, a fourth heat exchanger and a fourth heat exchanger, the first heat exchanger comprises a first heat exchange gas flow path and a second heat exchange gas flow path, the first heat exchanger comprises a first heat exchange gas flow path and a second heat exchange gas flow path, the first heat exchange gas flow path is communicated between an air box of the belt type roasting machine and a backheating fan, an air outlet of the backheating fan is opened towards an upper cover of the belt type roasting machine, the second heat exchanger comprises a third heat exchange gas flow path and a fourth heat exchange gas flow path which exchange heat with each other, and the third heat exchange gas flow path is communicated with the second heat exchange gas flow path; a flue gas outlet of the desulfurization system is communicated with the fourth heat exchange gas flow path, a gas inlet of the selective catalytic reduction reactor is communicated with the fourth heat exchange gas flow path, and a gas inlet of the denitration exhaust fan is communicated with a gas outlet of the selective catalytic reduction reactor. The system for denitration by using the return hot air of the belt type roasting machine can reduce the consumption of coal gas.

The invention discloses a method for preserving heat of a urea NaOH and Mg (OH) 2 storage cabin, and aims at a ship which is provided with an SCR (Selective Catalytic Reduction) system, an EGR (Exhaust Gas Recirculation) system, an iCER (Initial Continuous Emission Reduction) system and a desulfurization system and needs to store urea, NaOH or Mg (OH) 2. Condensed water of the air conditioning unit is collected and then introduced into the storage cabin in a gravity mode, and the condensed water generation amount and the condensed water temperature of the air conditioning unit are analyzed and calculated. On the premise that the cabin capacity meets the condition, condensate water is used for cooling the urea cabin and then discharged into the clean cabin bottom water cabin, and the cooling capacity of the condensate water is utilized to the maximum extent. In winter or in a cold area, when the air conditioning unit does not need to operate, in order to avoid too low temperature of the solution cabin, the storage cabin can be heated by using the discharged water in the clean cabin bottom water cabin before discharging, so that the storage temperature of the urea, NaOH or Mg (OH) 2 solution is ensured to be 10-35 DEG C.

The invention discloses an integrated treatment method and system suitable for multi-component industrial waste gas, and relates to the technical field of industrial waste gas treatment, and the method comprises the steps of S1, waste gas pretreatment, S2, pre-oxidation and sulfur fixation, S3, thermal oxidation, S4, non-quenching temperature self-adaptive adjustment, S5, selective catalytic reduction denitration, S6, emission and monitoring, and S7, intelligent dynamic system control. The gradient temperature field of the heat storage ceramic body is used for providing accurate and stable air inlet temperature for the SCR reaction, an independent quenching device is omitted, and therefore the comprehensive energy consumption and the operation cost of the system are greatly reduced, and by additionally arranging the pre-oxidation layer and adopting the dual-function SCR catalyst, the heat storage effect of the system is greatly improved. The system effectively realizes advanced fixation of organic sulfur and efficient removal of nitrogen oxides, dynamically adjusts the ammonia injection amount and combustion intensity, ensures that the system can still maintain extremely high treatment efficiency and stability under flow fluctuation and complex working conditions, reduces ammonia escape to the greatest extent, and is convenient to use.

An exhaust aftertreatment system (10) in the exhaust stream of an internal combustion engine (12) that is at least partially powered by an alcohol fuel is permeable to an exhaust stream containing nitrogen oxides as well as an alcohol and / or formaldehyde. The exhaust aftertreatment system (10) comprises a metering device (14) for metering ammonia into the exhaust stream, a first SCR catalyst (16), and a second SCR catalyst (18), wherein the first SCR catalyst (16) is arranged in the exhaust stream downstream of the metering device (14) and is configured to generate a treated exhaust stream from the exhaust stream of the internal combustion engine (12) that contains nitrogen oxides and at least one nitrogen-containing hydrocarbon compound.The second SCR catalyst (18) is arranged in the exhaust stream downstream of the first SCR catalyst (16) and is designed to reduce the nitrogen oxides contained in the generated treated exhaust stream by consuming the nitrogen-containing hydrocarbon compound contained in the generated treated exhaust stream. Furthermore, a method for exhaust aftertreatment and the use of an exhaust aftertreatment system (10) are specified.

An exhaust aftertreatment system (10) in the exhaust stream of an internal combustion engine (12) that is at least partially powered by an alcohol fuel is permeable to an exhaust stream from the internal combustion engine (12) containing nitrogen oxides as well as an alcohol and / or formaldehyde. The exhaust aftertreatment system (10) comprises an oxidation catalyst (14) for removing methanol and formaldehyde from the exhaust stream, an SCR catalyst (18), and a metering device (16) for metering ammonia into the exhaust stream, wherein the oxidation catalyst (14) is arranged in the exhaust stream upstream of the SCR catalyst (18). The metering device (16) is arranged in the exhaust stream upstream of the SCR catalyst (18) and upstream or downstream of the oxidation catalyst (14). Furthermore, a method for exhaust aftertreatment and the use of the exhaust aftertreatment system (10) are specified.

The invention discloses a modeling method of an SCR (Selective Catalytic Reduction) denitration system mechanism hybrid prediction model based on Transform. Feature extraction is carried out on the collected data, a reaction kinetic equation is constructed, an Euler method is adopted for solving, and unknown model parameters are reserved; a section of working condition stable data is selected from the collected data and imported into a mechanism model, optimal model parameters are found, the mechanism model of the SCR denitration reaction is obtained, and the A side outlet flue concentration and the B side outlet flue concentration are calculated through the model; a Transform model is trained to compensate the SCR system mechanism model, and the compensated SCR system mechanism model serves as real-time soft measurement values output by the A side and the B side; input variable selection is carried out on all-condition data, A-side and B-side outlet flue concentrations obtained by the mechanism model in real time and outputs at the first two moments are included into an input variable set, and time delay processing is carried out on input variables; and the mechanism models of the A-side flue and the B-side flue are connected in series with a Transform model, the Transform model needs to be imported into the output of the mechanism models in real time, and finally the SCR denitration system hybrid prediction model is obtained.

A non-transitory computer-readable media having computer-readable instructions stored thereon that, when executed by at least one controller, cause the at least one controller to cause a first doser to cease dosing a first reductant portion of a reductant to a first exhaust portion of exhaust upstream of a first catalyst member disposed in a first leg of a selective catalytic reduction (SCR) system. The instructions can cause the at least one controller to cause a second doser to dose a second reductant portion of the reductant to a second exhaust portion of the exhaust upstream of a second catalyst member disposed in a second leg of the SCR system. The instructions can cause the at least one controller to determine a first conversion efficiency of the first leg while the first doser is not dosing the first reductant portion and the second doser is dosing the second reductant portion.

A system, method, and apparatus for detecting sensor tampering are provided. An aftertreatment system includes a first train having a first selective catalytic reduction (SCR) system, a first doser, and a first NOx sensor; a second train having a second SCR system, a second doser, and a second NOx sensor; and a controller. The controller determines satisfaction of activation conditions. The controller doses reductant to the first and second SCR systems. The controller determines the NOx levels of the first SCR system and the second SCR system. The controller adjusts the dosing of the first SCR system for a period of time. The controller measures the NOx levels of the first SCR system and the second SCR system. The controller determines a difference between the third and first NOx levels and a difference between the fourth and second NOx levels.The control generates an indication as to whether the first NOx sensor is displaced.

The invention discloses a gas turbine SCR denitration ammonia injection automatic adjusting system and method, and relates to the technical field of gas turbine flue gas denitration, and the method comprises the following steps: periodically obtaining first difference value data and second difference value data; wherein the first difference value data is obtained by calculating the difference value between the outlet NOx concentration data and a preset NOx concentration target value; the second difference value data is obtained by calculating the difference value between the NOx concentration data before denitration and a preset NOx concentration target value; and performing double-component decomposition including a baseline component and a transient component on the first difference data, and recombining a double-component decomposition result to obtain unit area ammonia gas amount data. According to the scheme, the steady-state deviation and the dynamic disturbance are separated through error decomposition and variance correction, the problem of ammonia spraying amount calculation errors caused by the fact that the steady-state deviation and the transient deviation are not distinguished in the prior art is solved, the weight of the transient component is dynamically adjusted through variance correction, and the ammonia spraying amount calculation accuracy is improved. And the generation process of the unit area ammonia gas amount data can respond to the long-term operation requirement of the system.

The invention relates to a Ru / CeO2 passive nitrogen oxide adsorbent as well as a preparation method and application thereof. The Ru / CeO2 passive nitrogen oxide adsorbent comprises the following components in percentage by weight: 0.1 to 5.0 percent of Ru and 95.0 to 99.9 percent of CeO2. The Ru / CeO2 adsorbent is prepared by adopting an excessive impregnation method, and the specific method is as follows: adding the prepared CeO2 carrier into a ruthenium nitrate solution, adding deionized water for dilution, stirring for 10-15 hours at normal temperature, then carrying out rotary evaporation on the mixed solution at 60-80 DEG C, drying for 6-12 hours in a drying oven at 60-120 DEG C, and finally roasting for 2-6 hours in an air atmosphere at 400-600 DEG C. The adsorbent is used for treating NOx-containing tail gas. Compared with the prior art, the adsorbent disclosed by the invention has the advantages that the adsorption capacity at 80 DEG C is up to 299 mu mol / g, the adsorbent is efficiently desorbed at 200-500 DEG C, the desorption capacity is up to 285 mu mol / g, and the adsorbent has excellent water-resistant and CO-resistant performance and cycling stability. The desorption temperature window of the Ru / CeO2 adsorbent is highly matched with the subsequent selective catalytic reduction (SCR) of nitrogen oxides, and the Ru / CeO2 adsorbent is matched with the subsequent SCR to realize efficient degradation of the nitrogen oxides, so that the Ru / CeO2 adsorbent has a wide application prospect.

The invention provides a urea injection control method and device and a vehicle. For each stage of SCR in a two-stage SCR aftertreatment system, the urea injection amount matched with the stage of SCR is determined based on the target mode started by an engine, the temperature value of an inlet, the exhaust flow, the nitrogen and oxygen concentration and the degradation factor, and on the premise that the emission standard is met, the urea injection amount matched with the stage of SCR can be controlled. The operation mode requirement of the engine and the actual treatment capacity of the selective catalytic reduction device are matched in time, the aftertreatment cost is reduced, the service life of the aftertreatment system is prolonged, and therefore the comprehensive treatment effect of the two-stage SCR aftertreatment system on nitric oxide is effectively improved.

The invention discloses an anti-alkali metal poisoning SCR (Selective Catalytic Reduction) catalyst and a preparation method and application thereof, and belongs to the field of catalysts for atmospheric governance, the SCR catalyst comprises the following components in percentage by mass: 80%-90% of TiO2, 0.5%-1.5% of V2O5, 3%-5% of WO3 and 3%-10% of a cocatalyst; the cocatalyst comprises one or two of zirconium phosphate and titanium phosphate. The SCR catalyst provided by the invention is high in targeting property and remarkable in alkali metal poisoning resisting effect. TiO2 is used as a main carrier, V2O5 provides a main catalyst active component, WO3 can improve the thermal stability and acidity of the catalyst, a cocatalyst loses activity after capturing alkali metal, and an effective chemical barrier is constructed by sacrificing the cocatalyst; the path that alkali metal ions continue to diffuse into the coating and react with key V-OH acidic sites is blocked, and the alkali poisoning resistance is qualitatively improved, so that the denitration activity of the catalyst is preserved.

The invention discloses a national sixth heavy diesel vehicle SCR failure test method based on a remote monitoring platform, and belongs to the technical field of diesel vehicle emission control, and the test method comprises the following specific steps: I, inputting various data of a vehicle within a preset time, and carrying out the validity verification of the input various data of the vehicle; iI, collecting real-time operation parameters of each vehicle, and classifying and identifying working conditions corresponding to each vehicle according to the operation parameters of each vehicle; iII, extracting various data of the vehicle passing the validity verification, and matching the data with dynamic threshold libraries corresponding to different vehicle working conditions; according to the invention, the fault identification accuracy can be improved to 88% or more, the troubleshooting time is greatly shortened, and meanwhile, through a three-stage progressive alarm mechanism, full-coverage monitoring from slight abnormity to serious faults is realized, so that the service life of the SCR system is prolonged by 30% or more, and the deployment cost is reduced by 60% or more.

The invention discloses a denitration system capable of automatically adjusting an ammonia spraying strategy, which comprises a data sensing layer and an execution layer, the data sensing layer comprises a plurality of measuring devices arranged at an inlet and an outlet of an SCR (Selective Catalytic Reduction) reactor, the execution layer comprises a plurality of ammonia spraying grids arranged along the section of a flue in a partitioned manner, and each partition corresponds to an independent ammonia spraying branch pipe; an adjustable flow control valve is arranged on each ammonia spraying branch pipe; the control layer is in communication connection with the data sensing layer and the execution layer, and the control layer comprises an advanced controller and is configured to receive real-time data of the data sensing layer and optimize the real-time data on the basis of a preset denitration model and an optimization algorithm; calculating the distribution uniformity index of the NOx concentration at the outlet of the SCR reactor and the target ammonia gas flow required by each partition of the plurality of ammonia spraying grids; and the distributed PID controller is connected with the advanced controller and is configured to receive the target ammonia gas flow of each partition and generate a control signal to drive the corresponding flow control valve, and the total ammonia consumption can be remarkably reduced under the same denitration efficiency.

The invention relates to the technical field of SCR (Selective Catalytic Reduction) denitration system equipment, in particular to an SCR denitration self-heating anti-blocking ammonia spraying nozzle and equipment, the ammonia spraying nozzle is provided with a double-layer sleeve structure, so that a heating cavity for mounting a heating device is formed between two sleeves; the inner pipe conveys mixed gas of ammonia gas and air, generation and attachment of viscous substances such as ammonium bisulfate are effectively avoided through heating of the heating device in the heating cavity, guide vanes are arranged in a nozzle at the end of the inner pipe, dust, ammonium salt and other substances attached to the position close to the nozzle are thrown away through centrifugal force, and the dust, the ammonium salt and other substances are prevented from being accumulated to block the nozzle; the ultrasonic generator is arranged on the outer pipe, so that ultrasonic waves can be emitted regularly, the inner pipe generates tiny vibration, dust, ammonium salt and other substances attached to the surface of the inner pipe are vibrated off, the self-cleaning function is achieved, the risk that the spray head is blocked is further reduced, and the problem that the ammonia spraying spray head is prone to being blocked is fundamentally solved.

The invention relates to the field of nitrogen oxide treatment, and particularly provides preparation and application of a Fe-Mn / NbOPO4 catalyst for improving water resistance and sulfur resistance of NH3-SCR (selective catalytic reduction) reaction. The preparation method comprises the following steps: 1, preparation of an NbOPO4 carrier: mixing and stirring a niobium source and a phosphorus source, dropwise adding ammonia water, filtering and washing to obtain a precipitate, further adding a CTAB / H2O solution, adjusting the pH value with H3PO4, carrying out hydrothermal aging in a reaction kettle, and finally filtering, washing, drying and calcining; and 2, loading Fe and Mn active components, dissolving an iron source and a manganese source in water by adopting a wet impregnation method, adding the NbOPO4 carrier, stirring, carrying out rotary evaporation, drying and calcining. When the air speed is 60000mL. G <-1 >. H <-1 >, the NOx conversion rate in the temperature range of 75-297 DEG C reaches 90% or above, and in a water-resistant and sulfur-resistant performance test of 5vol.% H2O and 100ppm SO2, the reaction activity is almost not obviously reduced. The SCR reaction temperature window of the manganese-based catalyst is widened, the water resistance and sulfur resistance of the manganese-based catalyst are effectively improved, and the manganese-based catalyst has wide application prospects.

Method comprising: Operating an internal combustion engine (14) to produce an exhaust gas stream (12) in an exhaust system including a selective catalytic reduction (SCR) catalyst (24) disposed in the exhaust gas stream (12), the exhaust system comprising: a reductant injection valve (20) connected to the exhaust system at a position upstream of the SCR catalyst (24); a first NOx sensor (16) upstream of the SCR catalyst (24); a second NOx sensor (30) downstream of the SCR catalyst (24); Determining a DeNOx target efficiency (102) for the SCR catalyst (24); Injecting a first amount of reductant into the exhaust stream (12) in response to the target DeNOx efficiency (102); Determining a current DeNOx efficiency (104) of the SCR catalyst (24) by removing NOx from the exhaust stream (12) as a function of a first result from the first NOx sensor (16) and a second result from the second NOx sensor (30); Determining that the current DeNOx efficiency (104) is less than the target DeNOx efficiency (102); Detecting an NH3 slip condition; in response to determining the NH3 slip condition, determining a preliminary DeNOx target efficiency (106) for the SCR catalyst (24); and Injecting a reduced amount of reductant in response to the preliminary target DeNOx efficiency (106) while increasing the preliminary target DeNOx efficiency (106) toward the target DeNOx efficiency (102) until at least one adjustment condition of the DeNOx efficiency is met, wherein the reduced amount of reductant is less than the first amount of reductant and wherein the preliminary target DeNOx efficiency (106) is determined as a function of the current DeNOx efficiency (104).

The invention discloses a high-water-resistance sulfur-resistant NH3-SCR catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. According to the preparation method, an ERI type molecular sieve membrane layer is successfully synthesized on a honeycomb cordierite support body by utilizing a one-pot hydrothermal method, and a bimetallic active component is introduced at the same time, so that a single-layer crystalline membrane CuFe-ERI catalyst is obtained; and under the induction of the crystal, a composite crystalline film CHA (at) CuFe-ERI (at) Cor catalyst with a sandwich type structure is hydrothermally synthesized. When the catalyst simulates that flue gas contains 100 ppm of SO2 and / or 5% of H2O, the NOx conversion rate of the whole temperature section is kept stable; especially in a test system containing H2O, the NOx conversion rate of the catalyst at a high temperature section (gt; 500 DEG C) is increased to 100%, which is far better than that of a single-layer film CuFe-ERI catalyst. The prepared catalyst shows a wide temperature conversion window when applied to NH3-SCR, and compared with a traditional denitration catalyst, the method is low in cost, high in yield and high in water resistance and sulfur resistance.

The invention discloses an ammonia spraying real-time feedback regulation method based on an SCR (Selective Catalytic Reduction) denitration system, which comprises the following steps: dividing a cross section partition on an outlet flue of the SCR denitration system, and synchronously collecting a flue gas sample on the cross section partition; dynamically adjusting the flow of a cooling medium of a gas cold air coil pipe through a self-adaptive fuzzy PID control algorithm, and cooling and dehumidifying each path of collected flue gas sample to obtain a dry flue gas sample; the concentration of each path of dry flue gas sample is analyzed in real time, and the optimal ammonia spraying valve opening strategy of each cross section partition is predicted by combining the ammonia spraying amount of each path, the flue gas flow of the SCR denitration system, the unit load and the ammonia escape concentration and adopting a multivariable model prediction control algorithm; and according to the predicted optimal ammonia injection valve opening strategy of each cross section partition, the ammonia injection valves of the corresponding cross section partitions are adjusted, and real-time feedback adjustment of ammonia injection is achieved.

The invention discloses an SCR system heating unfreezing control method and system, and the method comprises the steps: starting and continuously carrying out the heating unfreezing of a urea pump and a urea pipe when the SCR system meets a preset heating unfreezing condition; meanwhile, in the engine driving mode, the urea box is directly heated and unfrozen through engine cooling liquid; in the pure electric driving mode, when the temperature of engine cooling liquid is larger than the first preset cooling liquid temperature, an electronic water pump is started to circulate the engine cooling liquid to heat and unfreeze the urea box; otherwise, switching to an engine driving mode for heating and unfreezing; during heating unfreezing, the SCR system is subjected to pressure buildup under the pressure buildup condition, and heating unfreezing is stopped when pressure buildup succeeds. The SCR system heating and unfreezing control method of the hybrid power vehicle under different driving modes is comprehensively considered, and the reliability of the SCR system heating and unfreezing control technology of the hybrid power vehicle is effectively improved.

The invention discloses an H < 2 >-SCR and NH3-SCR double-path parallel connection ammonia hydrogen internal combustion engine aftertreatment system and a control method, the treatment system comprises a first catalytic reaction branch, a second catalytic reaction branch, a third catalytic reaction branch and a fourth catalytic reaction branch, the inlet end of the first catalytic reaction branch is connected to an exhaust pipe of an ammonia hydrogen internal combustion engine, and the first catalytic reaction branch is selectively communicated with the exhaust pipe of the ammonia hydrogen internal combustion engine; wherein an ammonia gas selective catalytic reducer is arranged on the first catalytic reaction branch; the inlet end of the second catalytic reaction branch is connected to an exhaust pipe of the ammonia-hydrogen internal combustion engine and selectively communicates with the exhaust pipe of the ammonia-hydrogen internal combustion engine; a hydrogen selective catalytic reducer is arranged on the second catalytic reaction branch; the inlet end of the anti-escape treatment device is selectively communicated with the outlet end of the first catalytic reaction branch or the outlet end of the second catalytic reaction branch; wherein the anti-escape treatment device comprises a hydrogen oxidation catalyst, an ammonia escape catalyst and an N2O decomposition catalyst which are connected in sequence.

The invention relates to a deep peak regulation-oriented SCR system NOx concentration prediction method and system, and the method comprises the steps: carrying out the abnormal data point elimination, missing value completion, data filtering processing and data standardization processing of historical operation data; updating model parameters of the ammonia injection mechanism model of the selective catalytic reduction denitration system and the long and short-term memory network model optimized by the arithmetic optimization algorithm in each preset duration; and based on the updated ammonia injection mechanism model of the selective catalytic reduction denitration system and the updated long-short term memory network model optimized by the arithmetic optimization algorithm, establishing a physical information neural network hybrid prediction model of the selective catalytic reduction denitration system. And predicting the nitrogen oxide concentration of the selective catalytic reduction denitration system in the deep peak regulation mode. Therefore, the problems that a traditional mechanism model depends on an accurate physical hypothesis, complex dynamic characteristics are difficult to deal with, the precision of predicting the NOx concentration of the SCR system is low, and the interpretability is poor are solved.

The invention discloses an ammonia escape control system of a selective catalytic reduction denitration system, and relates to the technical field of flue gas denitration of thermal power generating units. Accurate data support is provided for fine adjustment of the ammonia spraying amount by collecting and feeding back the nitrogen oxide concentration at the key position in the flue, so that the area with low local denitration efficiency is identified; meanwhile, the ammonia spraying amount is controlled through independent ammonia supply mother pipes and independent electric control valves on the basis of a plurality of ammonia spraying areas arranged in a matched mode of the measuring unit, a closed-loop control system with the regional nitrogen oxide concentration as a core feedback variable is formed, and each ammonia spraying area can respond independently; the problem of excessive or insufficient ammonia caused by traditional'one-step 'ammonia spraying is avoided, the ammonia spraying uniformity is improved, and the ammonia escape rate and the ammonia salt accumulation degree are reduced.

The invention provides a catalyst composition, including a mixture of catalytically active particles and a magnetic material, such as superparamagnetic iron oxide nanoparticles, capable of inductive heating in response to an applied alternating electromagnetic field. The catalytically active particles will typically include a base metal, platinum group metal, oxide of base metal or platinum group metal, or combination thereof, and will be adapted for use in various catalytic systems, such as diesel oxidation catalysts, catalyzed soot filters, lean NOx traps, selective catalytic reduction catalysts, ammonia oxidation catalysts, or three-way catalysts. The invention also includes a system and method for heating a catalyst material, which includes a catalyst article that includes the catalyst composition and a conductor for receiving current and generating an alternating electromagnetic field in response thereto, the conductor positioned such that the generated alternating electromagnetic field is applied to at least a portion of the magnetic material.

The utility model provides cement kiln tail high-temperature low-dust SCR (Selective Catalytic Reduction) denitration equipment capable of realizing off-line ash removal, which comprises a high-temperature bag dust collector, a denitration reactor, a flue, more than two compartments, a flap valve assembly and an ash removal assembly for carrying out ash removal treatment on a filter bag to be cleaned of the high-temperature bag dust collector, all the compartments are arranged at the top of the high-temperature bag dust collector, the denitration reactor is arranged beside the high-temperature bag dust collector, the flue is located between the compartments on the two sides, and the flue is communicated with an air inlet of the denitration reactor; the air inlets of the sub-chambers are communicated with the corresponding high-temperature bag dust collectors, and the flap valve assemblies are located at the air outlets of the sub-chambers and used for communicating or blocking the air outlets of the sub-chambers with the flue; the flap valve assemblies are closed, the air outlets of the sub-chambers are blocked from the flue, the sub-chambers are unloaded, and smoke does not circulate in the sub-chambers, so that off-line ash removal of the high-temperature bag dust collector is achieved, and the single-chamber ash removal effect is more thorough.

The invention discloses a functional composite pore-forming agent, a sulfur-resistant denitration catalyst and a preparation method of the functional composite pore-forming agent and the sulfur-resistant denitration catalyst, and belongs to the technical field of selective catalytic reduction (SCR) of flue gas. According to the invention, the active component is prepared by adopting equivalent-volume impregnation; preparing a functional composite pore-forming agent containing citric acid and / or polyethylene glycol and a sulfur-resistant component MxOy-SiO2; the preparation method comprises the following steps: mixing and kneading an active component, a forming auxiliary agent and a functional composite pore-forming agent, performing extrusion molding, and performing roasting, phase forming and shaping according to a procedure, so that MxOy-SiO2 is deposited and fixed in situ on a new pore wall. The obtained strip-shaped catalyst has a high specific surface area and a pore wall sulfur-resistant functional layer, can effectively inhibit deposition of ABS in pores and slow down poisoning of SO2 to manganese-based sites, shows high NOx conversion rate and stability in an ultralow temperature interval of 80-320 DEG C, is suitable for denitration treatment of sulfur-containing complex flue gas such as steel, coking and cement, and has good industrial implementability.

The present invention relates to a zeolitic material having an AEI-type framework structure comprising SiO2, Al2O3 and B2O3, wherein the Al:B molar ratio of the zeolitic material, is comprised in the range of from 3 to 500, and wherein the zeolitic material displays an Si:(Al+B) molar ratio of the zeolitic material, which is comprised in the range of from 2 to 11. The present invention also relates to a process for the preparation of the zeolitic material according to the present invention, to a process for the treatment of NOx by selective catalytic reduction and to an apparatus for the treatment of a gas stream containing NOx, as well as to the use of a zeolitic material according to the present invention.