97results about How to "Reduce nitrogen oxide content" patented technology

A method and apparatus are provided for reducing the VOC, CO, and, alternatively, the NOx content of dryer offgas that is discharged into the atmosphere from a moist organic product drying process using thermal oxidizing apparatus that includes a burner, furnace, mixing chamber, thermal oxidizer, tempering chamber, and an indirect gas-to-gas heat exchanger. The dryer offgas is separated into two portions, with a larger portion being preheated by indirect heat exchange with the hot gaseous output from the thermal oxidizer. The non-preheated portion is directed to the burner in the function of flue gas recycle for NOx control. The preheated portion is separated into two portions, with one portion being directed to the furnace/mixing chamber of the thermal oxidizing apparatus. The other portion of the preheated offgas is recycled to the hot gas inlet of the dryer and serves the function of dryer heat transfer media. Ultimately, all the dryer offgas enters the thermal oxidizer, and comprises a smaller non-preheated portion directed to the burner and a larger preheated portion directed to the furnace/mixing chamber. By preheating a large proportion of the offgas directed to the thermal oxidizing apparatus, simultaneous achievement of an adequate thermal oxidizer temperature, 1600° F., and an adequate oxygen concentration of 5% by volume is achieved for optimized thermal oxidation of carbon monoxide and volatile organic compounds.

The invention relates to an integrated method for simultaneously realizing denitrification, desulfurization and heavy metal removal from flue gas, and special equipment suitable for the method. The integrated method is characterized in that an acidic gas capture agent adopted by the invention captures SO2 and/or highly charged nitrogen oxides NOx in raw flue gas and thus ammonium sulfate as a by-product and/or ammonium nitrate as a by-product is obtained finally, and the acidic gas capture agent adsorbs heavy metals in the raw flue gas simultaneously, wherein the above processes are carried out in a same absorbing device. The special equipment suitable for the method of the invention comprises an absorbing tower, a raw flue gas input pipeline having an external connection with the absorbing tower body, a purified flue gas output pipeline having an external connection with the absorbing tower body, a system for supplying the acidic gas capture agent and absorbents, a demisting water input pipeline, an absorption liquid cycling system, a slurry discharge system, and a separation and treatment system, wherein the raw flue gas input pipeline is provided with a supercharging system anda forced oxidation system. Through the method of the invention, the integrated purification processes of denitrification, desulfurization and heavy metal removal from flue gas can be completed in a same device and by-products from the integrated purification processes are ammonium sulfate and ammonium nitrate, wherein ammonium sulfate and ammonium nitrate can be utilized as components of fertilizers. Through the method, waste water and waste residue are not produced in the integrated purification processes and the integrated purification processes have the advantages of simple system, low cost, high recovery rate, etc.

Methods and systems are provided for an exhaust gas aftertreatment system for a combustion engine in a motor vehicle. In one example, the exhaust gas aftertreatment comprises at least two catalyst devices arranged in an exhaust tract, and a feed device for a reducing agent arranged between the two catalysts, and which furthermore comprises a first heat device at the inlet of the first catalyst and a second heat device downstream thereof, the system adapted for the reduction of nitrogen oxides.

A method for low-contamination generation of energy comprising: (a) forming a gas mixture by mixing a treated gaseous effluent stream and air; (b) introducing the gas mixture and fuel at a given gas to fuel ratio into at least one diesel engine (3); (c) burning the fuel in the diesel engine to generate energy and a flue gas stream comprising particulate matter (PM), and nitrogen oxides (NOx); (d) treating at least a portion of the flue gas stream with an aqueous stream in a cyclone unit (27) comprising a housing defined by a cylindrical peripheral wall (2) and provided with at least one inlet opening (10) for receiving flue gas and at least one inlet opening for receiving fluids thereinto and with at least one swirling means, whereby a treated gaseous effluent stream and an aqueous effluent stream are formed; (e) emitting a portion of the treated gaseous effluent stream to form an emitted portion; (f) using a portion of the treated gaseous effluent stream to form the gas mixture, and (g) repeating steps (a) through (f) multiple times;

A system to supply hydrogen-rich fuel to an internal combustion engine, whereby a hydrogen-rich gas is produced from a liquid raw fuel by a hydrogen generator. The exhaust line of the internal combustion engine contains an exhaust purification system, such as a DeNOx catalytic converter, which is at least temporarily supplied with hydrogen-rich gas through a bypass line. In addition, the exhaust line is in thermal contact with the hydrogen generator in order to recover thermal energy.

An apparatus for reducing NO_x contained in exhaust gas as an exemplary embodiment of the present invention may include: a DOC device primarily oxidizing an exhaust materials containing THC and CO in the exhaust gas by using a first DOC; a CPF device mounted downstream of the DOC device to receive the exhaust gas primarily oxidized by the DOC device, further oxidizing the exhaust materials containing the THC and the CO by heat generated during the primary oxidation and an oxidizing agent coated therein, and oxidizing NO in the exhaust gas into NO₂ by using the generated heat and the oxidizing agent coated therein; a nozzle mounted downstream of the CPF device, and dosing a reductant to the exhaust gas; and a SCR device mounted downstream of the nozzle, and reducing NO_x in the exhaust gas into N₂ by using the NO₂ generated in the CPF device and the reductant.

The invention discloses a built-in biomass gasification combustion hot water boiler which comprises a water heater, a biomass gasification device and a combustion chamber. The water heater comprises a water tank and a plurality of smoke pipes. The biomass gasification device is used for generating biomass gas. The combustion chamber is arranged between the water heater and the biomass gasification device and used for combusting the biomass gas and conveying smoke generated after combustion into the water heater so as to heat water in the water tank. The biomass gasification device comprises a device body, a fire grate, a fire barrier, an air sleeve and a first water jacket, wherein the interior of the device body is divided by the fire grate into a gasification reaction chamber in the middle and an air chamber on the lower portion, and the interior of the device body is divided by the fire barrier into a gas storage chamber on the upper portion and the gasification reaction chamber in the middle. Generated water vapor is supplied to the gasification reaction chamber through the first water jacket to serve as a gasification agent, cold air is preheated in the air sleeve into hot air through the air sleeve, then the hot air is supplied to the combustion chamber for combustion supporting, and the biomass gas is supplied to the combustion chamber to be combusted through the gas storage chamber.

The invention relates to a process for treating garbage percolate, in particular to a process for spraying and treating percolate and aims to provide a reliable and efficient garbage percolate treatment method for spraying the garbage percolate for burning treatment. The garbage percolate can be prevented from polluting the environment and the pollution problem can be solved completely. In order to fulfill the aim, the process for spraying and treating the percolate is provided and comprises the following steps of: collecting the percolate; filtering the percolate; and spraying the percolate. A technical process for spraying, burning and treating the percolate is simple and is convenient to operate. Stock garbage percolate can be decomposed fully or concentrated solution produced in other treatment modes can be treated simultaneously and secondary pollution is avoided; and compared with other treatment modes, the process has low construction, operation and maintenance costs, small floor area and high automatic control degree and is convenient to operate.

The invention relates to a catalytic composition for treating coal combustion gases, to a method for preparing said composition, to a catalytic system having such a composition, and to the use of the catalytic composition for treating coal combustion gases. The catalytic composition is made of particles of a solid composition cCeO₂zZrO₂ containing rhodium in the form of Rh₂O₃ and rhodium in the form of Rh⁴⁺.

The invention discloses an inside-mixing type reducing agent atomizing spray gun for an SNCR (Selective Non-Catalytic Reduction) denitration process, belonging to the technical field of boiler denitration devices. The inside-mixing type reducing agent atomizing spray gun comprises a spray gun sleeve, an electric propulsion plant and a spray gun and is characterized in that the spray gun sleeve is installed on the external wall of a boiler and communicated with a boiler hearth; the spray gun sleeve is inclined downward and has an included angle of 5-15 degrees with the horizontal plane; and the electric propulsion plant is fixedly connected with the spray gun and fixedly connected with the spray gun sleeve. When the system is put into operation, a motor is rotated forward and drives a screw rod to rotate through a coupler, a screw nut is moved forward in the rotation action of the screw rod and drives the spray gun to move forward and enter the hearth to spray; and when the system is shut down, the motor is rotated reversely and the screw nut moves backward to drive the spray gun to exit the hearth. The inside-mixing type reducing agent atomizing spray gun disclosed by the invention has the advantages of good atomizing effect, high degree of automation, low rate of gas consumption and prevention of corrosion to a water-cooled wall and is applicable to boilers such as a medium-small coal-powder boiler and a circulating fluidized bed the like; and the atomizing medium can be compressed air or steam.

The invention provides an ultralow-emission nitrogen oxide biomass chain boiler. The ultralow-emission nitrogen oxide biomass chain boiler comprises a boiler body, a chain grate and a spiral feeder, wherein an upper header, a lower header, an upper boiler barrel and a lower boiler barrel are arranged in the boiler body; a hearth, a flue gas radiation chamber, a flue gas convection box and a smoke exhaust box are arranged in the boiler body; an air preheater is arranged in the smoke exhaust box; the chain grate is arranged at the bottom of the hearth; primary air is supplied from the air chamber of the chain grate; in particular, hearth front and back air jet pipes are arranged on front and back arch throats respectively, and are connected with front and back air jet pipe fans; secondary air is supplied in two segments from front and back arches. Furthermore, the primary air can be supplied in two segments from the air chamber of the chain grate; the air source of the primary air and/or the secondary air can be hot air output by the air preheater; 1-3 afterburning ports are formed beside a feeding hole in the front arch throat; a denitrification combustion device is correspondingly arranged on each afterburning port. By adopting the ultralow-emission nitrogen oxide biomass chain boiler, zero emission of carbon dioxide is basically realized, and the effect of low emission of dust, nitrogen oxide and sulfur dioxide is achieved.

The invention discloses a steam self-supply system for producing sodium nitrate/sodium nitrite, which is suitable for preparing sodium nitrate/sodium nitrite. A desalination water tank is connected with a waste heat boiler through a coal economizer, and the waste heat boiler is connected with an ammoxidation reactor; the coal economizer is communicated with a crystallizer through an alkaline absorber, a preheater, an I-effect evaporator and an II-effect evaporator; the preheater is connected with the desalination water tank; a converter is respectively connected with the I-effect evaporator and a centrifugal machine; the II-effect evaporator is respectively connected with an alkaline dissolving workshop section and the crystallizer; the alkaline dissolving workshop section is connected with the centrifugal machine through a condenser and the crystallizer. The steam self-supply system is remarkable in energy saving benefit, convenient for process regulation and pollutant discharge reduction, high in degree of automation, remarkable in steam saving effect and high in recycling ratio.

The invention relates to a multifunctional ashless combustion accelerant of heavy oil. The multifunctional ashless combustion accelerant is characterized by comprising a free oxygen generating agent, a catalyst, a dispersing agent and a solvent. The invention aims at solving the technical problem of providing a multifunctional ashless combustion accelerant, which has the advantages of combustion acceleration (oil saving), smoke abatement and reduced emission of harmful gases. According to the multifunctional ashless combustion accelerant of the heavy oil, the calorific value of a fuel can be increased, and the discharged smoke content and the oil consumption are reduced; the fuel oil undergoes a more complete combustion after the multifunctional ashless combustion accelerant of the heavy oil is added; in addition, the nitric oxide content and the sulfur dioxide content in discharged smoke are remarkably reduced, and the atmospheric pollution can be improved after the multifunctional ashless combustion accelerant of the heavy oil is added. When the addition amount of the multifunctional ashless combustion accelerant of the heavy oil is 0.3 percent, the oil saving ratio can reach more than 5 percent.

The invention relates to the technical field of heating furnaces, in particular to a control method and device for reducing the nitrogen oxide content in the heating furnace combusting waste gas. Themethod comprises the steps that the current furnace temperature of a first furnace temperature control area in a heating furnace is acquired; it is judged whether the difference value of the current furnace temperature and the set target furnace temperature is greater than a first numerical value or not; if the different value is not greater than the first numerical value, the furnace temperatureof the first furnace temperature control area is adjusted to first set target temperature; and if the different value is greater than the first numerical value, the process target furnace temperatureis acquired, and after temperature adjustment of first set time is conducted on the first furnace temperature control area with the process target furnace temperature as the aim, the current furnace temperature is acquired again, wherein the process target furnace temperature is between the current furnace temperature and the set target furnace temperature. According to the control method for thereducing the nitrogen oxide content in the heating furnace combusting waste gas, when the current furnace temperature and the first set target furnace temperature differ much, the lower process targetfurnace temperature is used to conduct in-furnace multi-stage temperature adjustment so that the furnace temperature in the furnace temperature control area is stably adjusted to the set target furnace temperature, and the nitrogen oxide content generated when combustion is conducted in the heating furnace is reduced.

The invention provides a method for reducing nitrate radicals in an acid solution. According to the method, an acid solution containing the nitrate radicals is subjected to pre-reduction, the nitrateradicals are reduced to be in a nitrite radical state, then catalytic reduction is carried out, the nitrite radicals are directly reduced to be nitrogen, nitrate radical ions in the acid solution areremoved, and a generated gas is low in nitrogen oxide content, free of pollution to air and harmless to a human body; meanwhile, the method has the advantages of simple operation conditions and process, the invention further provides a device for reducing the nitrate radicals in the acid solution, and the device is simple and easy to operate and has great industrial application value.

A method of diluting fuel to reduce NOx using a fuel dilution device comprising: a first conduit having an inlet and an outlet for conveying fuel flowing into the inlet and out of the outlet in a first thermodynamic state and a first fuel index and a second conduit having an inlet and an outlet for conveying flow into the inlet and out of the outlet at a second/different thermodynamic state and a second fuel index that differs from the first fuel index by at least about 0.1 fluid flow, whereby there is a tendency to mix between the two streams exiting said outlet and discharge; near said outlet and discharge, at least a portion of the fuel mixes with at least a portion of the fluid, thereby producing a stream having intermediate fuel Exponential dilution of fuel flow.