196results about How to "Reduce the cost of denitrification" 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 a method and device for controlling NOx concentration in smoke gas of a cement kiln; the device comprises a decomposing kiln, a preheater and a reducing agent supply device, wherein the bottom of the decomposing kiln is communicated with a kiln tail chimney of the cement kiln by an inlet smoke flue; the top of the decomposing kiln is communicated with the preheater by an outlet smoke flue; a plurality of spray guns communicated with the reducing agent supply devices are arranged at or/or in the middle upper part of the decomposing kiln or/and the outlet smoke flue in a layered way; and the device further comprises a central controller and a smoke gas automatic monitoring system, wherein the central controller is connected to the reducing agent supply devices; and the smoke gas automatic monitoring system is used for monitoring NOx concentration and smoke gas flow information in the kiln tail chimney and transmitting the NOx concentration and smoke gas flow information to the central controller. According to the invention, as a reducing agent is sprayed into the decomposing kiln through multi-site combined control, high removal rate of the NOx can be achieved without an SNCR (Selective Non Catalytic Reduction) and SCR (Selective Catalytic Reduction) combined technology.

The invention discloses an all-carbon flue gas denitrification system and method. Nitric oxides can be effectively removed with a carbon-based material as a catalyst and carbon monoxide as a reducing agent. The method includes the following steps that a reaction mode is determined according to the content of oxygen in flue gas and is divided into a high-oxygen mode and a low-oxygen mode; according to the high-oxygen mode, the flue gas and the reducing gas enter different reaction regions respectively to react for set time, then the flue gas enters the reaction region of the reducing gas for reacting, and the reducing gas enters the reaction region of the flue gas for reacting; according to the low-oxygen mode, the flue gas and the reducing gas enter the same reaction region to react; each reaction region contains the carbon support catalyst. By the adoption of the all-carbon denitrification system, efficient denitrification with the carbon-based material as the catalyst and the carbon monoxide as the reducing agent can be achieved, the denitrification cost is low, no other harmful ingredients are generated, and the all-carbon flue gas denitrification system is high in adaptability to temperature and components of the flue gas and particularly suitable for a power plant, a steel metallurgical industry and other industries with carbon materials as fuel.

The invention provides a dedusting and denitration system for thermal power plant fire coal smoke, which lowers denitration cost while ensuring that the system efficiently denitrate. The dedusting and denitration system is characterized in that heat exchangers comprise a heat exchanger I and a heat exchanger II; a coal economizer is provided with two smoke outlets, wherein one smoke outlet is ledto the high-temperature inlet of the heat exchanger I, and the other smoke outlet is led to the high-temperature inlet of the heat exchanger II; the high-temperature outlet of the heat exchanger I isconnected with the inlet of a smoke flow regulation valve; the outlet of the smoke flow regulation valve is connected with one inlet of a smoke mixer; the high-temperature outlet of the heat exchanger II is connected with the other inlet of the smoke mixer; the outlet of the smoke mixer is connected with the inlet of an efficient dust remover; the outlet of the efficient dust remover is connectedwith the low-temperature inlet of the heat exchanger II; the low-temperature outlet of the heat exchanger II is connected with the inlet of an SCR (Silicon Controlled Rectifier) reactor; the outlet of the SCR reactor is connected with an air preheater; and the low-temperature inlet to the low-temperature outlet of the heat exchanger I is low-temperature liquid.

The invention discloses a double-treatment cleaning and regenerating method for a vanadium-titanium based denitration catalyst and aims to solve the technical problem that the regenerating effect of the traditional vanadium-titanium based denitration catalyst is not so good. According to the technical scheme, the double-treatment cleaning and regenerating method comprises the following steps of: introducing air-ozone mixed gas into a catalyst regenerating reactor, and carrying out oxidation treatment to obtain a regenerated vanadium-titanium based denitration catalyst; then, placing the regenerated vanadium-titanium based denitration catalyst into a catalyst activity liquid, dipping the regenerated vanadium-titanium based denitration catalyst for 4-6h, then, taking out the regenerated vanadium-titanium based denitration catalyst, drying the regenerated vanadium-titanium based denitration catalyst in dry air at 50-60 DEG C for 1-3h, and then, repeating the operation once; and then, roasting the regenerated vanadium-titanium based denitration catalyst at the temperature of 160-200 DEG C for 1-3h, and then, roasting the regenerated vanadium-titanium based denitration catalyst at the temperature of 300-400 DEG C for 1-3h to obtain the cleaned and regenerated vanadium-titanium based denitration catalyst. The double-treatment cleaning and regenerating method has the beneficial effects that the denitration ratio of the regenerated vanadium-titanium based denitration catalyst can be up to 87%, so that efficient regeneration is realized, meanwhile, the conversion ratio of SO2/SO3 is effectively reduced, and the denitration cost is greatly reduced.

The invention discloses a face-fired boiler advanced denitration burning method. The method comprises the following steps: fire coal is sent to a hearth through primary air in the primary air nozzles of a plurality of turbulent burners in each of layers of turbulent burners arranged on a front wall and a rear wall and is burnt, secondary air is introduced through secondary air nozzles of the turbulent burners, over fire air is introduced through one or more layers of over fire air nozzles on the front wall and the rear wall, the primary air and the secondary air on the front wall and the rear wall are oppositely introduced, the excess air coefficient range of the main burning area of the turbulent burners is 0.5-1.05, and the fire coal undergoes low oxygen burning; the excess air coefficient range of the over fire area of the over fire air nozzles is 1.05-1.3, and oxygen rich burning is carried out; and one or more layers of an amino reduction inhibitor are injected to the hearth under the uppermost over fire layer to reduce nitrogen oxides in flue gas in high temperature environment in the hearth and inhibit generation of new nitrogen oxides. The face-fired boiler advanced denitration burning method has the advantages of substantial reduction of the nitrogen oxide discharge value of the outlet of the hearth, realization of ultralow discharge, no strict temperature window or catalyst, great reduction of the denitration cost, and prevention of high temperature corrosion of water screens in the boiler.

The invention discloses a W-firing boiler advanced denitration combustion method. The method comprises the following steps: fire coal is sent to a hearth through primary air in the primary air nozzles of a plurality of main combustors on boiler arches of a front wall and a rear wall and is combusted, secondary air and under-arch secondary air are respectively introduced through secondary air nozzles and under-arch secondary air nozzles, exhaust gas wind is introduced through exhaust gas wind nozzles on the front wall and the rear wall, one or two layers of over-fire air are introduced through over-fire air nozzles, the excess air coefficient range of a main combustion area is 0.7-1.05, and the fire coal undergoes low oxygen combustion; the excess air coefficient range of an over-fire area is 1.05-1.3, and oxygen rich combustion is carried out; and one or more layers of an amino reduction inhibitor are injected to the hearth under the uppermost over-fire air layer to reduce nitrogen oxides in flue gas and inhibit generation of new nitrogen oxides. The W-firing boiler advanced denitration combustion method has the advantages of substantial reduction of the nitrogen oxide discharge value of the outlet of the hearth, realization of ultralow discharge, no strict temperature window or catalyst, great reduction of the denitration cost, and prevention of high temperature corrosion of water screens in the boiler.

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 present invention discloses a preparation method and an application of a starch and poly(butylene succinate) thermoplastic blend, belonging to the technical field of environmental protection. The preparation method comprises the following steps of: adding a plasticizer and other additives to starch and poly(butylene succinate) serving as the raw materials, uniformly mixing under stirring, completely extruding with a twin-screw extruder and granulating to obtain a product. The obtained starch and poly(butylene succinate) thermoplastic blend is simultaneously used as a denitrification microbial carbon source and a biofilm carrier for water treatment, thus avoiding the defects that the carbon source adding amount is difficult to control in the conventional denitrification processes usingthe liquid carbon sources, and has strong adaptability to the DO (dissolved oxygen) content and pH value of inflow water.

The invention provides an industrial pulverized coal boiler burning device used for spraying ammonia in the center of a burner, and relates to the technical field of industrial pulverized coal boilers. The problems that according to an existing horizontal industrial pulverized coal boiler, the NOx emission amount is high, the NOx emission reduction cost is high, the burnout condition of pulverized coal is poor, the adjusting capacity for load change is poor, the boiler thermal efficiency is low, and slagging is severe are solved. The burning device comprises a primary air pipe, a direct flow secondary air pipe, a rotational flow inner secondary air pipe, a rotational flow outer secondary air pipe, a mixer, an amino reducing agent conveying pipe, a concentrated pulverized coal conveying pipe, a hearth and a two-stage over-fire air system. The primary air pipe, the direct flow secondary air pipe, the rotational flow inner secondary air pipe and the rotational flow outer secondary air pipe are sequentially arranged from inside to outside. The amino reducing agent conveying pipe and the concentrated pulverized coal conveying pipe are connected with the inlet end of the mixer. The outlet end of the mixer is connected with the inlet end of the primary air pipe. The two-stage over-fire air system is arranged on the wall of the hearth. The burning device is used for an industrial pulverized coal boiler.

The invention belongs to the technical field of water treatment methods and particularly relates to a method for removing nitrate nitrogen in water by using a blended material including PHBV (Polyhydroxylbutyrate Valerate) and bamboo powder. The method comprises the following steps of: adding blended particles, including the PHBV and the bamboo powder, with the particle size being 0.3-0.5cm into a fixed-bed reactor, wherein the filling rate is 30-60%; and adding underground water into the reactor directly without adding any seed sludge, and starting the reactor, wherein the initial hydraulic retention time (HRT) is 17h, and HRT is gradually reduced after the nitrate nitrogen concentration of effluent reaches 2-5mg/L. According to the invention, the blended material including the PHBV and the bamboo powder is taken as both a carrier of a biological membrane and a carbon source for denitrification, and has the advantages of obviously improving the biodegradability of materials, shortening the starting time of the reactor and reducing the denitrification cost; the underground water instead of sludge of a sewage treatment plant is added into the solid carbon-source reactor directly for acclimation starting, so that pathogenic bacteria in the sludge of the sewage treatment plant can be prevented from being introduced, thus the method is particularly suitable for the denitrification treatment of underground water and drinking water; and the reactor is simple in operation and running, easy to control and good in effluent quality.

The invention provides a catalyst for flue gas denitrification. The catalyst is multi-component metal oxide comprising Fe2O3, CeO2, NiO and TiO2. The Fe2O3-CeO2-NiO/TiO2 multi-component metal oxide serving as an SCR (selective catalytic reduction) flue gas denitrification catalyst has the advantages of high resistance to H2O and SO2 poisoning, low denitrification cost and the like and also has higher thermal stability, wider temperature window and better low-temperature denitrification activity.

The invention discloses a NOx emission reduction system based on ignition and sintering of a dry mixture. According to the technical scheme, the system comprises a sintering machine; bellows are arranged below trolleys of the sintering machine; the sintering is sequentially divided into four areas including a preheating and drying section, an ignition section, a flue gas quick-heating section and a tail section in the advancing direction of the trolleys; the bellows below the tail section are connected through fluidized bed reactors, a high-temperature flue gas main flue, a high-temperature flue gas dust remover, a high-temperature flue gas circulating fan and a high-temperature flue gas circulating pipe sequentially with a high-temperature circulating flue gas cover located above the preheating and drying section. With the system, the pollution emission amount is small, the recovery rate of waste heat of sintering flue gas is high, no outsourced denitration catalyst is used, and generation of NOx in the flue gas is effectively reduced.

The invention discloses a polymer solid powder denitration agent for flue gas denitration and a preparation method thereof. The polymer solid powder denitration agent comprises the following raw materials in percentage by weight: 10-70% of an organic amino active compound, 10-40% of an inorganic active amino compound, 5-40% of inorganic mineral substance powder, 5-30% of active mineral substance powder and 1-10% of an additive. The polymer solid powder denitration agent has the advantages of simple components, easily available raw materials, simple preparation method, high denitration efficiency, high cost performance and good fluidity, is convenient for conveying the denitration agent in a denitration process, can improve the denitration efficiency of the denitration agent and reduce secondary pollution, and overcomes the defects in the prior art.

The invention discloses a denitrification agent, a preparation method and a dry-method denitrification method, and relates to the technical field of smoke treatment. The denitrification agent is prepared from: 1 to 15 percent of macromolecular resin, 30 to 70 percent of urea, 1 to 15 percent of sodium hydrogen carbonate, 5 to 20 percent of silicon dioxide, 10 to 20 percent of kaolin, 5 to 10 percent of talcum powder, 5 to 20 percent of diacetonitrile, and 1 to 30 percent of bentonite. The method comprises the following steps: mixing all the raw materials to obtain the denitrification agent. The denitrification method comprises the following steps: spraying the denitrification agent into a temperature area of 750 to 1000 DEG C in a hearth, reacting, and removing the nitrogen oxide in the smoke. The denitrification efficiency of the denitrification agent for the smoke is at least 80 percent or above; the SCR process can be completely substituted; the denitrification cost can be reduced;the operation difficulty can be reduced; the denitrification efficiency can be improved, and the emission standard of the nitrogen oxide can be reached.

The invention provides a denitrification and decarbonizing treatment system and method of landfill leachate in a late period, and belongs to the field of wastewater treatment. The system comprises a denitrification reactor, a nitrosation reactor, an anaerobic ammonia oxidation reactor, a concentrating pool, an oxidization pool and two return-flow system. According to the system, the concentratingpool is arranged and used for intercepting nondegradable organic substances in water output through the anaerobic ammonia oxidation reactor; the nondegradable organic substances can be oxidized into degradable organic substances through the oxidization pool, so that a carbon source is supplied to the denitrification process; the return-flow system supplies a proper environment to microorganism, and wastewater can be treated with high efficiency and low consumption; with the adoption of the system for treating the landfill leachate in the late period, the high independence of the denitrification process on additional organic substances can be avoided, so that demands on the organic substances can be decreased, and the denitrification cost of the landfill leachate can be decreased.

The invention discloses an application method of a sulfur autotrophic denitrification biological carrier in an anoxic tank. The invention relates to the technical field of microbiological water treatment. The invention aims to solve a series of problems caused by low mass transfer effect when a sulfur autotrophic denitrification technology is applied. The technical scheme provided by the inventionis as follows: a filler unit assembly is filled with the sulfur autotrophic denitrification biological carrier to form filler units, n groups of the filler units are arranged in each anoxic tank, each group of filler units comprises m filler units, and m and n are positive integers not less than 1; the filler units in the same group are connected in series, and the adjacent filler units are connected with each other through ropes; each group of filler units is fixed at the bottom of the anoxic tank or suspended on a buoy or a truss by connecting the filler units at the head/tail positions inseries, so that the filler units are dispersed in the anoxic tank. By using the method provided by the invention, the denitrification efficiency of the anoxic tank can be greatly improved.