340 results about "NOx" patented technology

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

The invention 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 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 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 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 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 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 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.

The application discloses a multi-layer dispersion combustion, high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner and a multi-stage combustion method, and belongs to the technical field of energy saving and environmental protection. The mounting flange of the burner is connected with a furnace chamber. The burner comprises a cylinder body, the cylinder body is divided into a fuel cavity and a combustion-supporting cavity which are relatively independent through a transverse partition plate, the fuel cavity is used for conveying yellow phosphorus tail gas, and the combustion-supporting cavity is used for conveying high-pressure and high-speed combustion-supporting air. A center gun is arranged at the center of the cylinder body, an inlet end of the center gun is communicated with the fuel cavity, a plurality of layers of spray gun pipes are arranged, nozzles of a part of the spray gun pipes are staggered in height, and the nozzles of the spray gun pipes are oriented in different directions; a part of the spray gun pipes are provided with rotating blades; an air automatic rotating assembly is arranged at the outer periphery of an outlet end of the center gun and is communicated with the combustion-supporting cavity, and the air automatic rotating assembly is used for automatically and rapidly rotating the combustion-supporting air, so that the combustion-supporting air and the yellow phosphorus tail gas are fully mixed. The application solves the problems of yellow phosphorus tail gas ultra-low NOx and CO emission and yellow phosphorus tail gas blockage.

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

This utility model belongs to the field of waste treatment technology, and in particular to a white mud treatment device, including a crushing box, a feeding hopper, and an incineration boiler. The crushing box is fixedly installed on one side above the base; a feeding pipe is fixed to the bottom of the crushing box, and an incineration boiler is fixed to one side of the feeding pipe. The incineration boiler has a furnace chamber inside, and a flue pipe is fixedly connected to one side of the incineration boiler. Sludge and white mud are mixed in a specific ratio. The alkaline components CaCO₃ and Ca(OH)₂ of the white mud react chemically with the acidic pollutants in the sludge, such as sulfur and nitrogen compounds, during combustion. The sludge provides the calorific value of organic matter combustion, and the white mud provides an alkaline adsorbent, reducing the amount of fuel and desulfurizing agent used. During combustion, the CaO generated by the decomposition of white mud directly reacts with SO₂ and NOx in the flue gas, reducing the load on subsequent desulfurization processes. The CaO, SiO₂, and other components in the ash after combustion can be directly used in building materials.

The object of the present invention is to provide a regenerative burner device that can easily reduce NOx contained in combustion exhaust gas by simply adding an extremely simple means. [Solution] The regenerative burner comprises a cylindrical body having an inlet and outlet for fuel gas, a heat storage body surrounding the cylindrical body, a fuel supply unit that supplies fuel gas to the inlet of the cylindrical body, and a housing that houses the cylindrical body and the heat storage body and is connected to the fuel supply unit and radiant tubes. The housing has an inlet / outlet for introducing combustion air into the housing during combustion, a flow path that flows the combustion air introduced from the inlet / outlet toward the outlet of the cylindrical body via the heat storage body, and a space formed on the flow path between the inlet / outlet and the heat storage body. The fuel supply unit has a first supply path that supplies fuel gas to the inlet of the cylindrical body and a second supply path that supplies fuel gas to the space in the housing.

The invention provides an ammonia cracking gas turbine. The gas turbine comprises a supply device, an ammonia combustion device and a turbine, the ammonia combustion device is coaxially provided with a combustion chamber, an annular ammonia cracking pipe and an on-duty fuel pipe from inside to outside; the combustion chamber is divided into a main combustion area and a NOx reduction area in the airflow direction, and an outlet of the combustion chamber is connected with the turbine. The inner wall of the annular ammonia cracking pipe and the outer wall of the combustion chamber form an ammonia cracking channel; an on-duty premixing channel is formed by the outer wall of the annular ammonia cracking pipe and the inner wall of the on-duty fuel pipe; and the second ammonia gas inlet of the main combustion area is communicated with the first ammonia gas outlet of the ammonia cracking channel and the second ammonia gas outlet of the on-duty premixing channel. According to the method, hydrogen is generated after ammonia cracking, ammonia-hydrogen co-combustion is achieved, the combustion efficiency and stability of the ammonia cracking gas turbine are improved, meanwhile, reduction reaction is conducted on ammonia and NOx at the high temperature, NOx in tail gas is removed, and zero-carbon efficient clean combustion of the gas turbine is achieved.

Processes and apparatuses for treating NOx from a carbon dioxide stream. Prior to separating carbon dioxide and NOx, NOx is converted to nitrogen gas in an NOx conversion zone, which may include an SCR reactor and / or CO boiler. A carbon separation zone which may include one or more fractionation columns produces a CO2 stream and an NOx stream. The NOx is passed back to the NOx conversion zone.

A burner system suitable for deep peak shaving includes a dual-purpose burner for both coal combustion and burnout, located directly below and above a pulverized coal burner. The combustion system's air box includes a pulverized coal burner air box and a dual-purpose burner air box. The pulverized coal burner air box is connected to the pulverized coal burner, and the dual-purpose burner air box is connected to both the dual-purpose burner and the burnout air burner. The dual-purpose burner is arranged in the burnout air area of ​​the furnace. By opening or closing the pulverized coal pipeline of the dual-purpose burner, it can flexibly function as both a pulverized coal burner and a burnout air burner depending on the unit load, ensuring that the main reheat steam temperature under low load and the NOx generated by combustion under high load meet design requirements.

The invention discloses a power station boiler NOx emission prediction method and system based on XGBoost. The method comprises the steps of S1, obtaining boiler operation data; s2, preprocessing the operation data; s3, performing time delay correlation analysis on each variable in the normalized data set and the NOx concentration at the outlet of the SNCR region by adopting an MIC correlation coefficient method, determining the time delay time of each variable relative to the NOx concentration at the outlet of the SNCR region, and performing time translation and reconstruction on each variable to form a training data set with aligned time delay; s4, establishing a NOx emission prediction model on the training set by using an XGBoost algorithm, and adjusting and optimizing model hyper-parameters through a grid search method to obtain an optimized NOx emission prediction model; and S5, predicting the test set by using the optimized NOx emission prediction model, and outputting a predicted value of the NOx concentration at the outlet of the SNCR region. The method has the advantages of high prediction precision and the like.

The invention discloses an ammonia gas catalytic cracker. The cracker comprises a shell and a corrugated coil pipe in the shell, a separation blind plate is arranged in the shell and is parallel to the bottom surface, and the internal space is divided into an upper half area and a lower half area; the corrugated coil pipe repeatedly penetrates through the separation blind plate; the pipe section, located above the separation blind plate, of the corrugated coil pipe is filled with an ammonia catalytic cracking catalyst, and the pipe section, located below the separation blind plate, of the corrugated coil pipe is not filled; an air inlet and an air outlet are formed in the two sides of the upper half area of the shell respectively, and a flue gas inlet and a flue gas outlet are formed in the two sides of the lower half area of the shell respectively; wherein the air inlet and the flue gas outlet are on the same side, and the air outlet and the flue gas inlet are on the same side; an inlet of the corrugated coil is connected with an ammonia pipeline, and an outlet is connected with a cracking gas pipeline. Part of ammonia gas is pre-cracked by utilizing the ammonia gas cracking catalyst, and heat is provided for cracking reaction in the corrugated coil pipe by utilizing flue gas waste heat, so that the adjustment of the combustion property of fuel gas is realized, and the possibility is provided for reducing fuel type NOx.

The application discloses a high-power pure-ammonia low-nitrogen combustor, which comprises a wind box, a first-stage air distribution air duct, a second-stage air distribution air duct, a third-stage air distribution air duct and a fourth-stage air distribution passage, a point ignition device is arranged in the first-stage air distribution air duct, and a tangential cyclone device is arranged in the fourth-stage air distribution passage; a central cyclone disc is fixedly connected to the front end of the first-stage air distribution air duct, a plurality of annularly-arranged first-stage ammonia fuel nozzles are arranged in the second-stage air distribution air duct, and the first-stage ammonia fuel nozzles are connected with first-stage ammonia fuel distribution rings through connecting pipes; a flue gas entrainment plate with a plurality of through holes is arranged at the front end of the third-stage air distribution air duct, and front ends of a plurality of second-stage tubular ammonia fuel injection guns pass through the flue gas entrainment plate; a plurality of third-stage ammonia fuel injection guns are arranged in the fourth-stage air distribution passage, and each tubular ammonia fuel injection gun is connected with a corresponding ammonia fuel distribution ring; a system cut-off valve and an adjusting valve are arranged on a conveying pipeline of each ammonia fuel distribution ring; the combustor can realize multiple-stage fuel grading and multiple-stage air distribution, and can realize stable combustion through self-entrainment and backflow of multi-stage high-temperature flue gas in a stable combustion area, so that stable combustion of ammonia fuel is realized and a low-NOx emission effect is achieved.

This invention relates to a low-NOx combustion system and method suitable for carbon roasting, including a roasting furnace and a flame system. The flame system includes an atomizing swirl low-NOx burner and an exhaust pipe. The atomizing swirl low-NOx burner includes a base, a gas pipe, a lower gas guide pipe, and a support rod installed at the lower end of the base. The lower gas guide pipe is sleeved over the gas pipe, and the gas pipe is sleeved over the support rod. A nozzle is installed at the lower end of the support rod, with the lower end face of the nozzle higher than the lower end face of the gas pipe. An annular gap is left between the nozzle and the gas pipe, and multiple inclined grooves are provided on the outer circumference of the nozzle. The furnace chamber includes a preheating zone and a roasting zone. The temperature in the roasting zone is controlled at 1200℃-1400℃ to reduce the generation of thermal NOx. The exhaust pipe promptly discharges the flue gas from the preheating zone, shortening the residence time of the high-temperature flue gas in the preheating zone and reducing the generation of transient NOx. The hollow swirl gas ejected from the nozzle mixes rapidly with the surrounding air, achieving energy saving and NOx reduction effects.

The invention belongs to the technical field of fuel additives and clean energy. The invention provides a fuel oil additive, which is prepared from 40 to 60 parts of fatty acid ester, 10 to 20 parts of alcohol ether compounds, 1 to 3 parts of nanometer oxides, 2 to 4 parts of surfactants, 1 to 2 parts of oxidation stabilizers, 2 to 3 parts of sodium benzoate, 1 to 2 parts of 2, 6-dimethyl pyridine, 0.5 to 1 part of metal organic catalytic combustion improvers and 20 to 30 parts of solvent oil. The fuel additive can significantly improve the fuel combustion efficiency, reduce the fuel consumption, reduce the emission of CO, HC, NOx and soot, and improve the combustion stability and storage performance. The additive selects part of bio-based raw materials, has the characteristics of energy conservation, emission reduction, greenness and low carbon, is suitable for the field of combustion-supporting modification of gasoline, diesel oil and biofuel, and has good environmental benefits and application prospects.

Provided is a flue gas treatment device configured to treat a flue gas discharged from a combustion device that combusts fuel containing ammonia, and the flue gas treatment device includes: an ammonia decomposition unit having an ammonia decomposition catalyst that decomposes ammonia contained in the flue gas; and a nitrogen oxide decomposition unit having a second catalyst that decomposes nitrous oxide and NOx contained in the flue gas in which ammonia was decomposed by the ammonia decomposition unit.

The utility model discloses an absorption device for qualified discharge of NOx in adipic acid tail gas, which comprises a first absorption tower, a second absorption tower, a third absorption tower, a compressor and a discharge chimney, the first absorption tower and the second absorption tower are connected to a first inlet pipeline of the discharge chimney in parallel through a first absorption tower outlet pipeline and a second absorption tower outlet pipeline respectively, an inlet of the compressor is provided with a first compressor inlet pipeline and a second compressor inlet pipeline, an outlet of the compressor is connected with the third absorption tower, and an outlet of the third absorption tower is connected with a second inlet pipeline of the discharge chimney. A first absorption tower outlet bypass pipeline and a second absorption tower outlet bypass pipeline are respectively arranged on the first absorption tower outlet pipeline and the second absorption tower outlet pipeline in a branching manner and are connected to the first compressor inlet pipeline in parallel through pipelines. And unqualified NOx in the tail gas is discharged after being absorbed again by the absorption tower instead of being discharged by an original discharge chimney, so that the problem of unqualified tail gas discharge of the device is solved.

The utility model relates to denitration equipment for solving the problem of high ammonia escape in flue gas of a waste incineration plant, and aims to solve the technical problems that the mixing uniformity of ammonia gas and flue gas is poorer, the ammonia gas and the flue gas are non-uniformly mixed, local escape is increased and secondary pollution is caused because the ammonia gas is directly introduced to be mixed with the flue gas at present. The mixing mechanism comprises a denitration pipe fixedly connected between the upper end and the lower end of an inner cavity of the denitration tower and denitration particles used for flue gas denitration, the denitration pipe is provided with an ammonia gas pipe, the ammonia gas pipe is distributed in an S shape, a plurality of gas outlet holes are formed in the inner side of the ammonia gas pipe at equal intervals, the middle of the top end of the ammonia gas pipe is communicated with a gas inlet pipe, and the gas inlet pipe is communicated with a gas outlet pipe. According to the utility model, ammonia gas in the denitration pipe is uniformly distributed in the denitration pipe at equal intervals, and NOx in flue gas is fully contacted and mixed with the ammonia gas, so that the mixing uniformity of the ammonia gas and the flue gas is improved, and secondary pollution caused by local ammonia gas escape and rise due to non-uniform mixing of the ammonia gas and the flue gas is avoided.

The invention discloses a catalyst combination method for simultaneously removing CO and NOx in flue gas, which is characterized in that two reaction systems are arranged in a flue gas purification device, the flue gas enters the flue gas purification device, ammonia spraying operation is carried out, oxidation reaction is carried out on the upper layer of the flue gas purification device, and CO in the flue gas is oxidized into CO2 and part of NO is oxidized into NO2 under the catalytic action of an oxidation catalyst Co1-xNix / Al2O3; according to the method, CO and NOx in the flue gas are removed at the same time, NH3-SCR reaction is carried out on the lower layer of the flue gas purification device, and under the catalytic action of a NOx selective reduction catalyst, blown ammonia gas and NOx in the flue gas are converted into N2 and H2O, so that CO and NOx in the flue gas are removed at the same time. The flue gas purification device is utilized to realize efficient and synergistic removal of CO and NOx, and has the characteristics of high efficiency, simple catalyst preparation, convenience in engineering application and the like.

The invention provides an NOx treatment system and method based on plasma activated water, and relates to the technical field of industrial waste gas treatment. The method comprises the following steps: acquiring waste gas containing nitrogen oxide NOx; according to the method, plasma activated water containing an oxidizing agent is used for spraying exhaust gas containing NOx to absorb NOx, the oxidizing agent and NOx are subjected to an oxidation-reduction reaction in the plasma activated water, and reaction products comprise nitrate ions dissolved in water. The plasma activated water containing the oxidizing agent is used for spraying the waste gas containing NOx, and NOx is effectively removed. Meanwhile, the activation reaction module can be integrated in the industrial waste gas treatment module, so that zero increase of the occupied land cost of NOx removal is realized. The plasma activated water device can be integrated into the semiconductor plasma waste gas treatment system, and the denitration targets of zero reagent addition, zero wastewater discharge and zero land occupation cost increase are achieved while semiconductor waste gas is efficiently treated.

The application discloses a kind of low NOx emission combustion control method of alkali furnace based on flue gas recirculation.The method is transported to the third air duct by induced draft fan after part of flue gas after dust removal, and air-gas mixture is formed after mixing with air, and is injected into the hearth from the alkali furnace third air distribution port.The application obtains the temperature field, concentration field and thermal efficiency in the furnace by establishing the geometric structure model and numerical calculation model of alkali furnace, and obtaining by CFD calculation;By adjusting different flue gas recirculation rates, the influence of flue gas recirculation rate on the temperature field, concentration field and thermal efficiency in the furnace is simulated, and the optimized flue gas recirculation rate is obtained.The application can reduce the oxygen content of the third air, reduce the generation of NOx in the high-temperature combustion zone, reduce pollution emissions, at the same time, the increased recirculation flue gas flow is beneficial to reduce the temperature of the lower part of the superheater, and relieve high-temperature thermal stress corrosion.