113results about How to "Guaranteed denitrification efficiency" patented technology

The invention discloses a double-rotation SCR denitration method and an apparatus thereof. According to the invention, a first eddy flow catalytic reaction chamber and a second eddy flow catalytic reaction chamber are arranged along a denitrating tower body; a flue gas introduction pipeline is arranged on a sidewall of the denitrating tower body; several eddy flow atomizing nozzles are respectively arranged on inner periphery of the flue gas introduction pipeline and the inner periphery at top of the first eddy flow catalytic reaction chamber; when flue gas is introduced into the flue gas introduction pipeline, the flue gas and ammonia gas injected by the eddy flow atomizing nozzle are mixed, and a mixture enables spiral sinking along circumference of the first eddy flow catalytic reaction chamber from up to down in a tangent circle mode, under effect of a cyclone, and then the mixture enable spiral rise along circumference of the second eddy flow catalytic reaction chamber from down to up in the tangent circle mode. Under prerequisite that high efficiency denitration is ensured, catalyst amount is less, operation of technical means is simple and easy, compared with the prior art, a denitrating tower structure is simple, cost of the apparatus is low, denitration efficiency is high, energy consumption is low, escapement ratio of ammonia is reduced, denitration cost is greatly reduced, and economic benefit is obviously increased.

The invention discloses an ultra-low emission circulating fluidized bed boiler with three stages of desulfurization systems. The three stages of desulfurization systems include a front desulfurizing agent adding system, an inner desulfurizing agent conveying system and a deep flue gas desulfurization system, the front desulfurizing agent adding system is positioned in a coal yard area in front of the boiler, the inner desulfurizing agent conveying system is positioned in a plant area of the boiler, and the deep flue gas desulfurization system is positioned in a tail area of the boiler; the front desulfurizing agent adding system comprises a front desulfurizing agent bin and a front desulfurizing agent gravimetric adding machine below the front desulfurizing agent bin, the inner desulfurizing agent conveying system comprises an inner desulfurizing agent bin and an inner desulfurizing agent conveying feeder below the inner desulfurizing agent bin, and an efficient desulfurizing agent circulating system and a flue gas supplementary dust removing device are further arranged on the deep flue gas desulfurization system. The ultra-low emission circulating fluidized bed boiler has the advantages that the systems are simple, are low in running energy consumption, can be regulated and controlled easily and conveniently, are high in desulfurizing agent utilization rate and desulfurization efficiency and free of water resource consumption and are widely suitable to be used with new circulating fluidized bed boilers in an environment-friendly manner and to modify existing circulating fluidized bed boilers in an environment-friendly manner, and space and equipment investment can be effectively saved.

The invention discloses a preparation method of a mixture of polyester and thermoplastic starch rich in starch and an application thereof, belonging to the technical field of environment protection. According to the method, the polyester and the thermoplastic starch rich in starch are taken as the raw materials, and addition agents such as aluminic acid ester coupling reagent and the like are added, thermoplastic starch/polyester blending material is prepared through banburying by a torque rheometer, and then a product is prepared through smashing, extrusion and pelleting. The thermoplastic starch base mixture rich in starch can be used as both a carbon source and a biofilm carrier for denitrification in the water treatment deep denitrification technology, so that the defect that the carbon source dosage is not easy to control in a conventional denitrification technology is overcome, the defects that the microorganism is difficult to form a membrane, the cost is high and the staring time is long when only biodegradable polymer is taken as a solid carbon source are overcome, and the thermoplastic starch base mixture rich in starch has strong adaptability to both water dissolved oxygen concentration and pH.

The invention relates to a glass kiln flue gas de-dusting, denitrification and desulfurization integral treatment process. The process comprises the following steps: glass kiln high-temperature flue gas is subjected to heat absorption by using a residual heat boiler and is cooled; the flue gas is cooled to a temperature range of 250-300 DEG C through the residual heat boiler, and is delivered into a de-dusting device wherein the flue gas is subjected to de-dusting; standard flue gas after de-dusting is returned to the residual heat boiler and is heated to a selective catalytic reduction (SCR) temperature window of 300-420 DEG C, and is delivered into an SCR denitrification device; standard flue gas after denitrification is returned to the residual heat boiler where heat is recovered; when the temperature of the flue gas is approximately 120+/-20 DEG C, the flue gas is delivered into a wet desulfurization device; and standard flue gas after a wet desulfurization treatment is discharged into the atmosphere through a chimney. According to the invention, the residual heat boiler is designed and modified, such that the boiler is provided with three sets of approximate temperature inlet and outlet, and thus various systems can work under appropriate temperature windows. Therefore, system reliability is endured, operation investment cost is reduced, and heat loss is minimized.

The invention discloses a denitrating coal economizer coal economizer high-temperature bypass device which comprises a coal economizer and a coal economizer bypass flue, wherein the inlet end of the coal economizer bypass flue is connected with one side of the coal economizer; an electrically operated baffle door is arranged at the inlet end of the coal economizer bypass flue; a coal economizer inlet is formed in the top of the coal economizer; a coal economizer outlet is formed in one side of the bottom of the coal economizer; a coal economizer ash hopper is arranged at the bottom of the coal economizer; the coal economizer outlet and the outlet end of the coal economizer bypass flue are connected with a vertical flue; an ammonia spraying grating is arranged on the vertical flue; a first horizontal flue is connected with the top of a denitrating reactor; a denitrating reactor inlet ash hopper is arranged at the bottom of a second horizontal flue; the bottom of the denitrating reactor is connected with a denitrating reactor outlet flue; and the denitrating reactor outlet flue is connected with an air preheater. The denitrating coal economizer coal economizer high-temperature bypass device provided by the invention has the beneficial effects that the necessary denitrating efficiency can be guaranteed, and the generation of sulfate and ammonium hydrogen sulfate can be inhibited; and large-grain ash slag in smoke can be removed, so as to avoid obvious hole blockage and erosion to a catalyst.

The invention provides a method for removing NOx and SOx from fluid catalytic cracking (FCC) flue gas. The method comprises the following steps of: mixing FCC flue gas and ammonia, performing selective reduction reaction of NOx in the presence of a catalyst, delivering the dust removed flue gas subjected to the selective reduction reaction to ammonium salt reclaiming and washing towers, delivering the flue gas cooled in the ammonium salt reclaiming and washing towers to an alkali liquor reverse contact desulfurization tower, and then discharging the treated flue gas, wherein the number of the ammonium salt reclaiming and washing towers is at least two, and the ammonium salt reclaiming and washing towers are used for flue gas heat exchange/ ammonium salt washing switching operation and have heat exchange type structures. By the method, the denitration and desulfurization processes are finished, ammonium salt is produced, energy consumption is saved, alkali consumption in the desulfurization process is saved, and the desulfurization cost is reduced.

The invention discloses the application of sugar-mill lime sludge in wet flue gas desulfurization. The application of the sugar-mill lime sludge is characterized in that the sugar-mill wet lime sludge is directly mixed with water to prepare slurry liquid, and the slurry liquid serves as an absorbing agent in a limestone-gypsum wet desulfurization method; the desulfurization absorbing agent is the waste lime sludge (namely filter residue or yellow mud) generated by the sugar prepared by a carbonic acid method in a sugar mill, mixed with water to form the slurry liquid with the proportion of 1:10-1:12, and used for absorbing sulfur dioxide (SO2) discharged by a coal burning boiler; and when the calcium-sulfur ratio is 1-1.1, the removal ratio of SO2 is up to more than 95 percent, the national desulfurization standard is met. The application of the sugar-mill lime sludge in the wet flue gas desulfurization adopts the waste residue of enterprises as the desulfuration absorbing agent, so as to be convenient and economic for material taking, simple in processing, and universal with the limestone-gypsum wet desulfurization method in requirements for equipment. The method not only saves the cost of purchasing an desulfurization agent, but also finds a way out for safe disposal of the lime sludge, so as to realize the purposes of treatment of wastes by other wastes, energy conservation and emission reduction, and have larger social environment benefits and economic benefits.

The invention discloses an underflow constructed wetland ecological system for disposing rural domestic waste and a disposing method. By adding root advantageous microorganisms in a canna water planting system, ratio of Alkaligenes, flavobacterium, lysobacter, Pseudomonas and other advantageous germs can be rapidly increased, the abundance of dioxygenase, dehydrogenase, phosphate dehydrogenase, urease, nitrate reductase, and dehydrogenase gene in catalase gene in the constructed wetland can be improved; two kinds of wetland plants can be planted in an intersecting manner, thus the different plant root secreta can be generated and a rich root microbial community structure is formed; the underflow constructed wetland ecological system can remove COD, ammonia nitrogen and total phosphorus atthe same time. Then the method of alternatively running continuous water feeding-intermittent water feeding is applied, thus the nitrogen removal efficiency is promoted while the system is stably operated. The method fully applies the advantages of the constructed wetland, strengthens the rapid construction of the constructed wetland ecological system, and optimizes the wetland running mode; the underflow constructed wetland ecological system is significant in environment, economic and social values.

The invention relates to an SCR inlet flue gas pre-treatment system and method, relates to boiler pollutant control technology, and are used for new construction or renovation projects of ultra-cleanNOx emission of grate-firing coal-fired boilers. The SCR inlet flue gas pre-treatment system comprises a temperature regulating system, a urea solution or ammonia water solution ejector, and a cycloneequalization system. The system adopts a heating way of extracting high-temperature flue gas from a hearth outlet and then introducing the high-temperature flue gas into a cyclone tube, and a coolingway of adding a temperature-regulating economizer or extracting low-temperature flue gas from flue gas at a boiler dust collector outlet or an air preheater outlet and then introducing the low-temperature flue gas into the cyclone tube through a cold flue, and the average temperature of SCR inlet flue gas is controlled within the working range of catalysts. A urea solution is ejected in a burnoutchamber through the urea solution ejector; an ammonia water solution is ejected at an inlet pipe of a cyclone separator through the ammonia water solution ejector; NH3 is produced under the action ofthe high-temperature flue gas and mixed into the flue gas. Under the combined action of a flow equalization board and the cyclone tube, the flue gas and NH3 are mixed uniformly to achieve the effectsof equal temperature, equal concentration field and equal velocity, thereby meeting the requirements on the temperature, concentration field and velocity field at an SCR inlet.

The invention relates to a low-temperature carbon-based combined desulfurization and denitrification flue gas system and a use method thereof. The system comprises a first reactor, a second reactor and a third reactor and the reactors have the same structures. Each one of the first reactor, the second reactor and the third reactor comprises a central carbon-based bed, left and right air distribution grilles and left and right gas collection tanks in the outer side. The carbon-based bed is filled with an activated carbon material. The system utilizes the three same reactors and has functions of fine desulfurization, denitration and regeneration. The fine desulfurization and denitratio processes are connected in series and are connected to the regeneration process in parallel and the processes are carried out simultaneously so that in-situ regeneration is really realized. The reactor comprises the central carbon-based bed, left and right air distribution grilles and left and right gas collection tanks. The bed has a large windward area so that uniform gas distribution in the work and regeneration processes is guaranteed and a floor space is reduced. The system further improves the desulfurization and denitrification performances of the activated carbon material.

An all-condition auxiliary denitration system and an operation method. thereof are provided. The system includes a heat-storage medium heater, a low-temperature reheater, an economizer, and an SCR denitration device which are successively interconnected, and further including a heat-storage medium tank and a heat-storage medium and feedwater heat exchanger. A flow of a cold heat-storage medium entering the heat-storage medium heater is regulated, so that heat absorption of the heat-storage medium is matched with a boiler load. Flows of hot heat-storage medium and feedwater, which enter the heat-storage medium and feedwater heat exchanger, are regulated through a feedwater regulating valve and a hot heat-storage medium outlet regulating valve. A total feedwater flow is regulated with assistance of a bypass feedwater regulating valve, so that a temperature of flue gas entering the SCR denitration device is kept in an optimal operation range under different boiler loads, and denitration efficiency is ensured.

The invention belongs to the technical field of flue gas denitration, and particularly relates to an SCR denitration device used for a heat-engine plant. The device comprises a box, a flue gas inlet,an ammonium hydroxide inlet pipe, a flue gas outlet, a dedusting module, an ammonium hydroxide spraying module, a filtering net module and a catalyst supplementing module; the flue gas inlet is formedin the left side of the box; the ammonium hydroxide inlet pipe is located under the flue gas inlet; the flue gas outlet is formed in the top of the box; the dedusting module is used for dedusting flue gas; the ammonium hydroxide spraying module is used for spraying ammonium hydroxide, and the ammonium hydroxide and the flue gas are mixed; the filtering net module is installed in the box; the catalyst supplementing module is located over the filtering net module, a annular groove is formed in the side wall of the box, and the catalyst supplementing module is installed in the annular groove ina sliding mode. The required flue gas denitration device is small in size and occupied space, a good flue gas dedusting effect and thorough dedusting are achieved, fast decline of the effect of a catalyst is relieved, a disabled portion on the surface layer of a catalyst is removed, and meanwhile, the catalyst is added freely.

The invention provides a process for preparing an SCR reducing agent from a coking residual ammonia wastewater as a raw material. The process is characterized by comprising the following steps: condensing ammonia vapor generated by a dephlegmator of an ammonia stripping system of a gas purification workshop in a coking plant to obtain coking strong ammonia water; removing impurities from the coking strong ammonia water by a filter and deoiling by an adsorption tower; adding an NaOH alkali liquor to the ammonia water, mixing evenly, and then conveying to a distillation tower to carry out secondary distillation; processing the ammonia vapor at the tower top through the dephlegmator and then processing by the condenser, so as to obtain refined strong ammonia water; adopting coking ammonia water generated by ammonia distillation of the coking residual ammonia wastewater as a preparation raw material of the SCR reducing agent, and refining the coking strong ammonia water to reach the requirements of the reducing agent used for SCR catalytic reduction, so that the denitration cost is reduced when the denitration efficiency is ensured.

The invention discloses an SNCR denitration method for urea solutions of double concentrations. A urea solution storage and preparation device (1), a urea preparation control module (3), an online attenuation module (3), a metering and distributing module (4), a reducing agent spraying module (5) and a urea solution spraying control device (6) are involved in the method, wherein the information input end of the urea solution storage and preparation device (1) is connected with the information input end of the urea preparation control module (2), and the control end of the urea preparation control module (2) is connected with the urea solution storage and preparation device (1). The urea solutions in two urea liquid storage tanks can be conveniently regulated to be of two different concentrations, and the concentration values are determined according to design calculation and site parameters; in this way, the regulation range is narrowed, accuracy is increased, and a denitration system conducts rapid reaction for the working condition changes of a boiler; particularly, under the low temperature of the downstream part of a window, the pure urea supply amount is rapidly increased, and the denitration efficiency is ensured.