93results about How to "Guaranteed denitrification effect" patented technology

The invention provides a catalytic agent for denitrating smoke and a preparation technology thereof. The catalytic agent for denitrating the smoke comprises the raw materials based on parts by weight as follows: 60%-90% of titanium dioxide, 3%-9% of tungsten trioxide, 0.5-3% of vanadium pentoxide, 2%-5% of organic binder, 10%-20% of inorganic binder, 7%-10% of glass fiber, 2%-4% of plasticizer, 20%-40% of water, 2%-4% of lubricant, 0.1%-1% of surface active agent and 3%-9% of neutralizer. After the content of the tungsten trioxide is reasonably proportioned, on the premise of guaranteeing thedenitration performance of the catalytic agent for denitrating the smoke, the absorption to sulfur dioxide is reduced, the SO2/SO3 conversion percentage is reduced, and the high-sulfur and high-ash use requirement of the coal quality in China is met.

Belonging to the technical field of low temperature SCR denitration, the invention discloses an active carbon loaded iron-based low temperature SCR denitration catalyst, a preparation method and application method thereof. The preparation method includes: taking grinded activated carbon as the carrier, using an Fe oxide as the main active component, adding trace Mn or Co as the active assistant respectively, loading the active component on the carrier by impregnation method, then conducting magnetic stirring and drying treatment, and finally performing roasting in air atmosphere, thus obtaining the low temperature SCR denitration catalyst. The low temperature SCR denitration catalyst provided by the invention has the characteristics of convenient production, simple use, and good denitration effect at low temperature, can well solve the problems of low denitration efficiency and slightly high use temperature section in existing denitration catalysts, thus being conducive to prolonging the service life of the catalyst, and saving cost.

The invention discloses modified sludge activated carbon used for low-concentration flue gas desulfurization and denitration, which comprises the following ingredients in percentage by weight: 0.41 to 6.46 percent of chitosan and 93.54 to 99.59 percent of sludge. A preparation method comprises the following preparation steps: 1, preparing a chitosan solution; 2, preparing sludge activated carbon; and 3, preparing chitosan modified sludge activated carbon. The invention uses the chitosan for the sludge activated carbon for the first time, so the modified ingredients reach the green environment protection standard on the premise that the invention effectively ensures that the desulfurization and denitration performance of the sludge activated carbon is not lower than the existing level.

The invention belongs to the technical field of flue gas denitration and relates to a system for denitration by spraying ammonia gas in a large-sized boiler high-temperature flue gas area. A boiler comprises a horizontal flue and a vertical flue. The system comprises an SNCR (selective non-catalytic reduction) system provided with a reducing agent injector, the reducing agent injector is a spray pipe disposed on the transverse section of the horizontal flue, an input end of the spray pipe is connected with a reducing agent conveyer, the other end of the spray pipe is closed, and the wall of the spray pipe opposite to flue gas is provided with a spray hole. The invention also discloses a denitration process for denitration treatment using the system, the denitration treatment with the system gives high denitration rate and low ammonia escape quantity as well as full flue gas purification, this product is applicable to present coal-consuming boilers for thermal power generation, iron and steel, chemicals, cements and the like, and satisfactory NOx emission index of these boilers can be ensured.

A denitration catalyst. A producing process of the denitration catalyst successively includes following steps: (1) manufacturing a catalyst base material with ceramic glass fibers; (2) soaking the catalyst base material manufactured in the step (1) in a mixture solution; (3) drying the soaked catalyst base material; (4) performing a calcining process. The catalyst base material in the step (1) is manufactured through a calendar having gears. The mixture solution includes following components on the basis of the total mass of the mixture solution, by mass, 20-30% of SiO2, 10-20% of glass fibers, 10-20% of V2O5, 5-10% of WO3 and 20-30% of TiO2. The catalyst is large in a specific surface area and is high in strength. On the premise of ensuring denitration effect, the catalyst is more excellent than a conventional honeycomb catalyst in anti-corrosion performance, anti-flue gas impact performance and the like.

The invention provides a sewage treatment method based on an improved A2O process, belonging to the technical field of sewage treatment. The method concretely comprises the steps of enabling sewage tosequentially pass through an anaerobic pool, an anoxic pool, an aerobiotic pool and a secondary sedimentation tank; mixing reflux mixed liquid in the aerobiotic pool with inlet water of the anaerobicpool, and then enabling the mixed liquid to enter the anaerobic pool for treating; inoculating the anaerobic pool with domesticated anaerobic sludge. Total nitrogen is removed by means of a combinedaction of anammox bacteria and denitrifying bacteria, so that the nitrogen removal ability is high; furthermore, the bacteria do not compete with phosphorus-accumulating bacteria for a carbon source and a growth space, so that the phosphorous removal efficiency is high. The method solves the problem of contradiction of carbon source competition between the phosphorus-accumulating bacteria and thedenitrifying bacteria and sludge age difference in an anaerobic pool of the traditional A2O process.

The invention belongs to the field of chemical wastewater treatment of the petrochemical industry and particularly relates to an efficient treatment combination process of acrylonitrile wastewater. The combination process comprises: (1) acrylonitrile production wastewater enters a catalytic oxidation tower for catalytic hydrogen peroxide oxidation treatment; (2) water discharged form the catalytic oxidation tower and factory domestic sewage enter a biochemical treatment system after full mixing; the biochemical treatment system sequentially comprises an anaerobic hydrolysis tank, an anoxia tank and an MBR tank; (3) the biochemical treatment system adopts a membrane separation technique for treatment; partial concentrated solution flows back; the acrylonitrile production wastewater is wastewater produced by acrylonitrile device wastewater after four-effect evaporation and steam stripping; the temperature is 50 DEG C-80 DEG C; the hydraulic retention time in the catalytic oxidation tower is 30-120 min. According to the efficient treatment combination process of acrylonitrile wastewater, the microorganism poison inhibition effect of the biochemical treatment system microorganism can be reduced, the wastewater biodegradability is improved, the treatment load and the treatment cost of the catalytic oxidation tower are reduced, the denitrification effect is guaranteed, and the membrane service life is prolonged.

The invention discloses a method for precisely controlling the dosage of an external carbon source in biological denitrification of sewage. The method comprises the steps as follows: (1) measuring denitrification potential of the external carbon source; (2) measuring concentration of NO3<->-N, NO2<->-N, total nitrogen and COD in to-be-treated sewage; (3) measuring the denitrification potential ofto-be-treated sewage; (4) calculating the total nitrogen content and COD content of to-be-treated sewage in unit volume, calculating the mass of N removed through denitrification reduction from organic matter contained in to-be-treated sewage in unit volume theoretically according to the denitrification potential of to-be-treated sewage, comparing the mass with the total nitrogen content to judgewhether the external carbon source is required, and calculating the dosage of the external carbon source added to the to-be-treated sewage in unit volume according to the denitrification potential ofthe external carbon source. By means of the method, the dosage of the external carbon source required for complete denitrification can be precisely calculated according to the water quality and watervolume conditions of the to-be-treated sewage.

The present invention relates to a composite precipitation tank with a function of sludge carbon source transformation. The composite precipitation tank comprises a center frequency conversion transmission, a slush mixer, a honeycomb duct, sludge crushing devices, slush distributor, a mud discharging device, an ultrasonic generator, a solid-liquid separator and a rectification water outlet weir. The center frequency conversion transmission is inserted into the tank body from top to bottom. The slush mixer is located in inner upper part of the tank; and periphery of the slush mixer is rectification water outlet weir. The solid-liquid separator is located in a middle and upper part in the tank. An upper sludge crushing device is located in a central part in the tank; and a lower sludge crushing device is located in a lower part in the tank. The ultrasonic generator is arranged between the upper and lower sludge crushing devices. The mud discharging device is located at the bottom of the tank. The slush distributor is arranged between the lower sludge crushing device and the mud discharging device. The honeycomb duct is L-shaped and extends into the tank; one end of the honeycomb duct is positioned below the slush mixer, and the other end is located below the lower sludge crushing device and connected with the slush distributor. The invention has the advantages of simple process, land saving, convenient management, greatly reduced cost of the operation and stable water outlet effect, and can be widely used in sewage treatment plant for nitrogen and phosphorus removal standard upgrade reconstruction, as well as in nitrogen removal treatment on low carbon source polluted water.

The invention relates to an automatic control system for flue gas denitration of an electric power plant, which comprises the components of: an ammonia water storage tank, a denitration device, a positive feedback detecting unit, a negative feedback detecting unit and a DCS system control unit. The outlet of the ammonia water storage tank is provided with an ammonia flow regulating valve which is connected with an ammonia flow regulator. The denitration device comprises a flue channel, a reactor and an ammonia spraying grid. The positive feedback detecting unit comprises an ammonia flow detector, a flue gas detector and an NOx content detector. The negative feedback detecting unit comprises an NOx flow detector. The flue channel is internally provided with a flue gas flow detector and a NOx content detector. The ammonia flow detector is arranged outside the ammonia spraying grid. The NOx flow detector is arranged outside the reactor. The signals acquired by the ammonia flow detector, the flue gas flow detector, the NOx content detector and the NOx flow detector are transmitted to a DCS system. The DCS system controls the ammonia flow regulator for realizing controlling for ammonia spraying amount of the reaction system. The automatic control system has functions of: realizing reliable control, saving manpower, and effectively controlling emission of NOx in flue gas of the electric power plant.

The invention discloses an efficient biological nitrogen removal process for sewage treatment. The process consists of an efficient biological nitrogen removal device main body for sewage treatment, asedimentation tank, a constant temperature system, a water inlet system, an aeration system and a dosing system, wherein the efficient biological nitrogen removal device main body is composed of a constant temperature water bath layer, an outer cylinder, a cylindrical flow guide, an inner cavity, a triangular flow guide, a fluidized filler and a fixed fiber filler. In operation of the process, the ammonia nitrogen concentration of fed water is 40-80mg/L, and the water retention time is 2-12 hours; and in operation of the process, an air pump is adopted for continuous aeration, the aeration rate is 0-6m<3> air/m<3>/h, the dissolved oxygen concentration inside the device main body is 0-2mg/L, the temperature is 25-40 DEG C, and the pH value is 7-8.5. According to the process, zeolite and activated carbon fiber are adopted to adsorb ammonia nitrogen, ecological structures of florae are optimized, and enrichment of functional florae is promoted; and bottom aeration is implemented to realize internal circulation and dosing is implemented when operating performance is reduced, and the process has the advantages of long-term stable operation, simple and compact structures, convenience inoperation, good ammonia removal effects, energy conservation and high efficiency, environmental friendliness, and the like.

The invention provides a sewage treatment system for an improved A<2>O process, belonging to the technical field of sewage treatment. The sewage treatment system concretely comprises a coarse screen well, a fine screen well, an anaerobic pool, an anoxic pool, an aerobic pool and a secondary sedimentation tank, wherein the anaerobic pool is inoculated with domesticated anaerobic sludge for carryingout an anaerobic ammonium oxidation reaction; the top of the anaerobic tank is provided with an exhaust port; an internal reflux mixed liquid pipeline is arranged between the aerobic pool and the anaerobic pool so as to enable nitrifying liquid to flow back; the reflux ratio of internal reflux is 300-500%; an external reflux sludge pipeline is arranged between the secondary sedimentation tank andthe anaerobic pool, and the reflux ratio of external reflux is 120-200%, and the secondary sedimentation tank is also provided with a residual sewage discharge outlet. The removal of total nitrogen is completed by a combined action of anaerobic ammonium oxidation bacteria and denitrifying bacteria, so that the denitrification ability is high; furthermore, the bacteria do not compete with phosphorus-accumulating bacteria for a carbon source and a growth space, so that the phosphorous removal efficiency is high.

The invention belongs to the field of environmental engineering, and relates to a corrugated-plate type SCR (selective catalytic reduction) denitration catalyst. The catalyst is in a corrugated-plate type and belongs to heterogeneous catalysts. A skeleton of the catalyst is made of a 316L stainless steel plate, a 316L stainless steel net, a titanium plate or a titanium net, wherein the thickness of the 316L stainless steel plate, the 316L stainless steel net, the titanium plate or the titanium net is 0.2-1mm; the stainless steel net or the titanium net has 200-600 meshes; and the stainless steel plate, the stainless steel net, the titanium plate or the titanium net is pressed into a corrugated shape, and corrugations are formed by connecting semi-circles of diameter of 2-30mm in an up-down manner. By adopting the stainless steel plate or the titanium plate as the skeleton of the catalyst; and by adopting a large-pore diameter channel design, the problem that the catalyst easily generates soot deposits when the dust content is relatively high is also solved.

The invention discloses a sludge treatment control system comprising a central controller, a data pretreating and storage device, a data collection unit, a data monitoring unit, a first flow controller, a second flow controller, an alarm and a cloud server. The system can monitor water sample data in a fermentation reactor and can dynamically distribute a carbon source and nitrate to the fermentation reactor according to the monitored water sample data so as to ensure a denitrification effect and ensure that sludge is reduced and stabilized, so that the accurate and automatic control of all parameters can be achieved efficiently. The system can improve economy and reliability of sludge treatment, and ensure health and safety of people and environment to the maximum extent, and also has remote control function and the advantages of being stable, reliable, and convenient to maintain and manage.

The invention discloses a fuzzy controller of a urea pyrolysis device. According to the fuzzy controller, the flow of a urea solution is adopted as a control target to perform automatic control; a urea supply pump conveys the urea solution in a urea solution storage tank to an atomization spray gun at the middle of a urea pyrolysis furnace through a urea pipeline; hot air for pyrolysis enters the pyrolysis furnace from the upper part of the pyrolysis furnace; the atomization spray gun sprays urea solution droplets into the pyrolysis furnace; and the high-temperature heat of the hot air is utilized to perform pyrolysis on the urea solution droplets. With the fuzzy controller adopted, inherent defects of an existing urea pyrolysis control system can be eliminated. The fuzzy controller is suitable for the automatic control process of the denitrated urea pyrolysis process, so that problems such as incomplete pyrolysis and insufficient heat can be solved.

The invention provides a Y-shaped SCR system catalyst online continuous regenerating device. The Y-shaped SCR system catalyst online continuous regenerating device comprises one first SCR reactor and one second SCR reactor, one smoke inlet pipeline, one flue switching structure provided with one first station and one second station, a first catalyst regeneration system connected with the first SCR reactor and a second catalyst regeneration system connected with the second SCR reactor, wherein the smoke inlet pipeline is communicated with the first SCR reactor when the flue switching structure is at the first station, and the smoke inlet pipeline is communicated with the second SCR reactor when the flue switching structure is at the second station. The Y-shaped SCR system catalyst online continuous regenerating device provided by the invention has the advantages that online regeneration of a denitration catalyst can be realized without halting a machine set, forced halt of the machine set due to SCR catalyst activity decrease is reduced, and economic security and operation level of the machine set are improved, so that operation cost of an SCR system is saved.

The invention belongs to the field of flue gas denitration in the cement industry, in particular to an SNCR system of a same-pass cement kiln. The SNCR system of the same-stroke cement kiln comprisesa reducing agent storage tank, a spray gun, a compressed air tank and a same-pass pipe, wherein the reducing agent storage tank is connected with the spray gun through a pipeline A, a pump, a valve Aand a flow meter are arranged on the pipeline A, the compressed air tank is connected with the spray gun through a pipeline B, a valve B is arranged on the pipeline B, and the pipeline length and thenumber of elbows of the pipeline A and the pipeline B are the same by arranging a same-way pipe. According to the SNCR system of the same-stroke cement kiln, the total resistance loss is the same, theworking pressure of each spray gun is the same, the flow distribution of a reducing agent is uniform, and the atomization state is the same.

The invention discloses an economizer water feeding system capable of adjusting the inlet smoke temperature of a denitration reactor and belongs to the field of boiler tail smoke treatment. The economizer water feeding system comprises a boiler, the boiler communicates with a smoke passage, the smoke passage is internally provided with a high-temperature economizer, the denitration reactor, a low-temperature economizer, an upper-stage air preheater and a lower-stage air preheater in the smoke conveying direction in sequence, and boiler smoke enters the smoke passage from the boiler and flows through the high-temperature economizer to perform heat release to reach an appropriate temperature to enter the denitration reactor to perform denitration reaction. According to the economizer water feeding system capable of adjusting the inlet smoke temperature of the denitration reactor, traditional series connection water feeding is changed into a form of series and parallel connection feedingwater jointly, the effect of adjusting the inlet smoke temperature of the denitration reactor is achieved by adjusting the water feeding amount of all segments of the high-temperature economizer and the low-temperature economizer to adjust the heat exchange amount, the temperature of the smoke entering the denitration reactor can be maintained within the optimal reaction temperature range of a catalyst all the time, the fact that the denitration reaction can be performed continuously and efficiently is guaranteed, and the nitrogen oxide emission concentration of the boiler tail smoke is stabilized.

The invention relates to multi-stage multi-segment AO enhanced phosphorus removal container type treatment equipment for rural sewage and a method of the equipment. The equipment has a water distribution tank, a biochemical sedimentation cabinet, a chemical sedimentation cabinet, a phosphorus removal treatment device, a fixed-bed anoxic zone and an MBBR aerobic zone; the fixed-bed anoxic zone is composed of multiple anoxic cabinets, perforated aeration tubes 36 arranged at the bottoms of the anoxic cabinets, and braided type fillers arranged on the perforated aeration tubes; the MBBR aerobic zone is composed of multiple aerobic cabinets, microporous aeration disks arranged at the bottoms of the aerobic cabinets and supporting filler nets filled with high-performance suspended fillers arranged on the microporous aeration disks; multiple anoxic cabinets and multiple aerobic cabinets connected in sequence at intervals to form a multi-stage multi-segment AO enhanced treatment system; and the water distribution tank is connected with the external sewage and the biochemical sedimentation cabinet and communicates with the anoxic cabinets through a water outlet pipeline, the adjacent aerobic cabinet and anoxic cabinet communicate with each through holes in the bottoms, the aerobic cabinets communicate with the biochemical sedimentation cabinet through holes in the bottoms, and the phosphorus removal treatment device is connected to the biochemical precipitation cabinet and the chemical precipitation cabinet for phosphorus removal treatment.

The invention discloses a constructed wetland-microbial fuel cell coupled treatment device and treatment method for rural domestic sewage. The treatment device comprises a grid, an adjusting tank, a water pump, a water inlet pipe, a water collecting pipe, a water outlet pipe, a return pipe, a water outlet tank, a constructed wetland and a microbial fuel cell, wherein the grid, the adjusting tank,the water pump, the water inlet pipe and the constructed wetland are sequentially connected; the multi-electrode microbial fuel cell is arranged in the constructed wetland; the water collecting pipe of the constructed wetland leads to the water outlet tank; and the bottom of the water outlet tank is connected with the water outlet pipe and the return pipe. Domestic sewage firstly enters the adjusting tank through the grid, then enters the device from the water inlet pip via the water pump, undergoes treatment under the dual action of the constructed wetland and the microbial fuel cell, and then enters the water outlet tank via the water collecting pipe, and 50% of the sewage is discharged through the water outlet pipe while the other 50% of the sewage flows back through the return pipe; the hydraulic retention time of the sewage is 1.5-2.0 days; the concentration of dissolved oxygen in a cathode region is 1.0-1.5 mg/L; and the output current of the device is more than 0.96 mA. The constructed wetland-microbial fuel cell coupled treatment device provided by the invention is simple in structure, convenient to operate and capable of effectively treating rural domestic sewage.

The invention relates to the technical field of denitration ammonia spraying devices, in particular to an ammonia spraying pipeline and a denitration ammonia spraying device. The ammonia spraying pipeline comprises an ammonia spraying pipeline body, a nozzle and protective angle steel, wherein the nozzle is arranged on the ammonia spraying pipeline body and is communicated with the interior of the ammonia spraying pipeline body; the protective angle steel is arranged on the outer surface of the ammonia spraying pipeline body, is arranged at a near-wind end of thethe flue gas flow direction S2relative to the nozzle, and is suitable for at least partially covering the nozzle; the section, which is perpendicular to the ammonia gas conveying direction S1, of the ammonia spraying pipeline body is of an oval structure; and the long axis of the oval structure is parallel to the flue gas flow direction S2. According to the ammonia spraying pipeline provided by the invention, the wind shielding area of the ammonia spraying pipeline can be reduced, the resistance of a system is reduced, the efficiency of the system is improved, and accurate energy conservation is realized.