88results about How to "Reduce purification efficiency" patented technology

The invention discloses a method and device for purifying particulate matters and volatile organic compounds in catering oil smoke by utilizing a synergistic effect of low temperature plasma and catalysts. The method comprises the following steps: enabling the oil smoke to sequentially pass through a low temperature plasma reaction area and a catalytic reaction area, wherein the volatile organic compounds contained in the oil smoke are partially oxidized in the low temperature plasma reaction area and are further oxidized in the catalytic reaction area. On the front section of the low temperature plasma reaction area, the particulate matters contained in the oil smoke are separated, removed or charged by alternately arranged positive and negative polarity high-voltage discharge; on a transition section of the low temperature plasma reaction area, particles with positive charges and negative charges are close and are subjected to coagulation growth; on a rear section of the low temperature plasma reaction area, the particles are continuously subjected to the coagulation growth and are captured and separated. According to the method, the function of efficiently purifying the volatile organic compounds is increased; the efficiency of removing the particulate matters contained in the oil smoke is relatively high; the normal temperature operation can be realized, the fouling resistance is high, and the method is particularly suitable for being used for performing oil smoke treatment in public places such as various dining halls, public houses and hotels.

In a hybrid vehicle, when the shift position SP is set to the S position at which a driver is allowed to select any one of the shift positions SP1 to SP6, and it is determined that warm-up of a purifying device has not been completed, the target air-fuel ratio AF* is set based on the S position / low coolant temperature-time target air-fuel ratio setting map. The air-fuel ratio AF* set based on the S position / low coolant temperature-time target air-fuel ratio setting map tends to be richer than the target air-fuel ratio AF* set based on any one of the normal-time target air-fuel ratio setting map and the D position / low coolant temperature-time target air-fuel ratio setting map that are used when the D position is selected.

The present invention relates to a method of purifying gaseous nitrogen trifluoride from CF4 as impurity. The method comprises selective adsorption of nitrogen trifluoride by dehydrated erionite at a temperature of from -30 to 30° C., displacement of carbon tetrafluoride by an inert gas, desorption and condensation of the purified nitrogen trifluoride. The purification yields 99.99% pure NF3 with CF4 content not over 10 ppm. The proposed method of NF3 sorption purification makes it possible to carry out the process at an ambient temperature and with long operating life of the sorbent. The method is practically feasible, economically expedient, and easy to implement under industrial conditions.

The invention belongs to the technical field of exhaust gas purification and particularly relates to a purification system for a mixture of micro-particles and volatile organic gas. The purification system comprises a particulate filter, a wet oxidation reaction tower, a photocatalytic reaction module, a fan and a flue gas discharge device and the above parts are orderly communicated through pipes. The photocatalytic reaction module comprises one or more photocatalytic reactors connected in parallel. The photocatalytic reactor comprises an electrodeless UV lamp, a quartz casing pipe and an outer cylinder. The electrodeless UV lamp comprises an inner electrode, an outer electrode and a variable high voltage power supply. Each inner wall of the outer cylinder is uniformly and fixedly provided with catalyst glass slides. The catalyst glass slide is uniformly coated with a catalyst. Through synergism purification of the three treatment methods, exhaust gas is completely decomposed. The adjustable variable high-voltage power supply can change low-pressure mixed gas so that ultraviolet lights with different wavelengths are obtained, different exhaust gas is degraded and activated carbonadsorption is avoided. The purification system has high purification efficiency, realizes a low cost and is easy to use.

The invention discloses a purification method for organic waste gas, which comprises the pre-treatment for the organic waste gas. The purification method is characterized in that the concentration of the pretreated organic waste gas is adjusted by an activated carbon adsorption bed firstly, and then the organic waste gas is purified by a plasma purifier. The purification method has the advantages that the stable operation of a plasma purification unit can be realized, large amount of auxiliary equipment are not needed, the energy consumption is low, the treatment process is simple, and the purification efficiency is high, thereby being suitable for treating the unstable organic waste gas with large air quantity and low concentration.

The invention relates to a supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device which comprises a subcritical ORC module, a supercritical ORC module and a supercritical heat accumulating module. The supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device is mainly composed of a condenser, a working medium storage tank, an electromagnetic valve, a working medium pump, an expansion machine, a preheater, a postprocessor, a supercritical heat accumulator, an overheating evaporator, a control unit and the like. The exhaust temperature is stabilized within a certain range by the supercritical heat accumulator, then exhaust enters the postprocessor, and the postprocessor is made to keep high purification efficiency and lower pollution emission under most of the working conditions of an engine. Meanwhile, organic Rankine cycle is used for recovering the heat of the exhaust to improve the utilization rate of energy. The supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device has the advantages that the organic Rankine cycle is used for achieving low pollution emission and efficient energy utilization.

In hybrid vehicle, when the shift position SP is set to the S position at which a driver is allowed to select any one of the shift positions SP1 to SP6, and it is determined that warm-up of a purifying device has not been completed, the target air-fuel ratio AF* is set based on the S position / low coolant temperature-time target air-fuel ratio setting map. The air-fuel ratio AF* set based on the S position / low coolant temperature-time target air-fuel ratio setting map tends to be richer than the target air-fuel ratio AF* set based on any one of the normal-time target air-fuel ratio setting map and the D position / low coolant temperature-time target air-fuel ratio setting map that are used when the D position is selected.

The invention provides a treatment method of polymer flooding and binary combination flooding-SP-sewage, which comprises the following steps: sequentially adding 30-50 mg / L industrial ferrous sulfate and 30-50 mg / L industrial ammonium persulfate in a concentration ratio of 1:1 into sewage in a sewage tank at a time interval of 15-20 seconds, and after reacting for 1-2 hours, sending into a sewage buffer tank; adding 150-1500 mg / L coagulant in the sewage from the sewage buffer tank before pumping, evenly mixing by a lifting pump impeller, sending into a cyclone reactor to react for 1.5-2.0 minutes, adding 8-12 mg / L anionic-type partially hydrolyzed polyacrylamide flocculant, carrying out cyclone reaction for 1.5-2.0 minutes, and sending into a sedimentation tank; sedimentating for 10-30 minutes to obtain purified water on the middle lower part, wherein the suspended substance concentration and oil content are less than 10 mg / L; and filtering to obtain injection water for low-permeability reservoirs, wherein the coagulant is prepared from 100-300 parts of aluminum sulfate, aluminum chloride or polyaluminium chloride, 1-300 parts of industrial hydrochloric acid, 20-100 parts of polydimethyldiallylammonium chloride and 300-780 parts of tap water.

The invention discloses a system for treating unstable large-volume VOCs waste gas. The system comprises: a preprocessing device used for preprocessing the waste gas to filter out dusts in the waste gas and removing non-VOCs in the waste gas; an adsorbing and concentrating connected to the outlet of the preprocessing device and used for adsorbing and concentrating the preprocessed waste gas; and ahigh-energy-level photooxidation device communicated with the outlet of the adsorbing and concentrating device through a homogenizing connection device, wherein the outlet end of the high-energy-level photooxidation device is further connected with a discharge pipeline through washing device, the adsorbing and concentrating device is provided with a hot purified gas inlet and a desorbed gas outlet, and the desorbed gas outlet is connected with an oxidation device, the oxidation device is provided with a purified gas outlet, and the purified gas outlet is connected with the discharge pipeline.The invention further provides a corresponding treatment technology of the system. A combined device or process of preprocessing, adsorption concentration, homogenization connection, high-energy-level photooxidation and washing absorption is adopted to make any unstable large-volume VOCs waste gas discharged in an ultra-clean manner.

The invention belongs to the technical field of industrial exhaust gas treatment and provides an industrial exhaust gas purification treatment system. The system comprises a gas inlet, an oil fume gas condensing tower, a wet water film high pressure industrial exhaust gas purifier, a bag dust removing device, a cold combustion electrolysis tower, a plasma photocatalytic device and a gas outlet, the above parts are orderly communicated by pipes, a fan is arranged at the gas outlet, the top of the oil fume gas condensing tower is communicated with the top of the wet water film high pressure industrial exhaust gas purifier, the bottom of the wet water film high pressure industrial exhaust gas purifier is communicated with the bottom of the bag dust removing device, the top of the bag dust removing device is communicated with the top of the cold combustion electrolysis tower, and the bottom of the cold combustion electrolysis tower is communicated with the bottom of the plasma photocatalytic device. The system solves the problem that the existing treatment device has poor industrial waste gas treatment effects and cannot satisfy the existing industrial waste gas treatment demands.

The invention discloses a full-temperature range pressure swing adsorption purification method for simultaneously removing water and hydrocarbon from natural gas. The full-temperature range pressure swing adsorption purification method comprises a light hydrocarbon and water vapor concentration process and a temperature swing adsorption rectification process, wherein in the light hydrocarbon and water vapor concentration process, the adsorption pressure is 0.5-7.0MPa, the operating temperature is 50-150 DEG C and normal-atmosphere evacuation desorption is performed; unabsorbed natural gas, containing methane and the like, is discharged from the top of an adsorption tower, is used as intermediate gas for removing most of water and light hydrocarbon, and then enters the temperature swing adsorption rectification process; a natural gas product with dew point drops of water and the hydrocarbon being lower than the minimum ambient temperature of 30-50 DEG C escapes from the top of the tower; one part is used as regenerating gas for regenerating the temperature swing adsorption rectification process and then the regenerating gas and raw gas are mixed and return to the light hydrocarbon and water vapor concentration process for further recycling the natural gas, or one part is used as purging gas of the light hydrocarbon and water vapor concentration process and the purging gas and desorption gas are pressurized for processing and recycling C2+ or sent out of a boundary for processing. By the full-temperature range pressure swing adsorption purification method, the yield of methane is 90-95% or above and the yield of C2+ is higher than 90%.

The invention relates to a domestic air-purifying environment-friendly bio-filter device composed of an air suction bin, a water and air storage bin and a filler bin. The air suction bin comprises an air suction fan and an air guide pipe. The air guide pipe communicates with the water and air storage bin. The water and air storage bin receives and contains excess water brought by the filler bin due to watering, contains indoor air guided in by the air suction bin and serves as a buffering area to transfer the indoor air to the filler bin. A water discharging pipe is arranged on the bottom side of the water and air storage bin. An air distribution layer, a filler layer and a soil layer are sequentially arranged in the filler bin from bottom to top. Green plants are planted in the filler bin. Compared with the prior art, the domestic air-purifying environment-friendly bio-filter device has the advantages of being adaptive to domestic use, matched with a construction module, capable of being conveniently applied by a family and capable of being assembled at various positions, and the purification implementation capacity of the domestic air-purifying device is greatly improved.

The invention discloses a chemical processing waste gas purification tower comprising a tank body, an air inlet is fixedly formed in the lower part of the outer surface of the tank body; an air outletis fixedly formed in the outer surface of the upper end of the tank body; a vertical filter screen is fixedly installed on the lower portion of the inner side of the tank body, a falling groove is fixedly formed in the position, close to one side of the air inlet, of the lower end of the inner side of the tank body, a partition plate is fixedly connected to the outer surface of the upper end of the filter screen, and an air inlet pipeline is fixedly installed at the position, away from the air inlet, of the lower portion of the tank body. According to the chemical processing waste gas purification tower, waste gas can be subjected to multi-layer filtration, granular solids in flue gas are fully filtered out, solid waste is easy to concentrate and convenient to clean, the water tank is purified, the waste gas makes full contact with a purifying agent, the contact time is prolonged, and the waste gas purification effect is improved.

The invention belongs to the field of air purification and discloses a purification device for removing air-carried life particles. The purification device comprises a guiding jet device, a particle collector, at least one filter, an axial flow fan and a casing. By utilizing air jet flow impact, the life particles in the air are separated and inactivated, and thus sterilization efficiency is improved; air flow flows through a filtering device, so that the remaining air-carried particles are removed, and finally an effect of purifying indoor air is achieved. According to the device, a microwave heating method is further adopted, so that the whole device, and particularly the filter, maintain a dry state, and reproduction of microorganisms in the purification device and on the wall of the purification device is avoided. The device can be placed in an indoor air purifier or an air conditioning system pipeline, and is of great significance for reducing the content of disease source particles in the air and improving workers' health level and safety guarantee capacity of a building.

The invention discloses a spray drying room. The spray drying room is provided with an air supply system and a waste gas treatment system as a whole. The air supply system comprises a fresh air box fixedly connected to one side of the spray drying room, the fresh air box is equipped with a fresh air inlet and an air supply outlet communicated with the inside of the spray drying room, and an air supply fan equipped with a heating unit is arranged between the fresh air inlet and the air supply outlet. The waste gas treatment system comprises a paint mist filtering box and a waste gas purifying box which are fixedly connected to the other side of the spray drying room in sequence, the paint mist filtering box is equipped with a paint mist filtering inlet communicated with the inside of the spray drying room and a paint mist filtering outlet communicated with the waste gas purifying box body, and at least two stages of filtering sections are arranged between the paint mist filtering inletand the paint mist filtering outlet; and an adsorption module and an adsorption fan are arranged in the waste gas purifying box, the adsorption module is located between an air inlet of the adsorptionfan and the paint mist filtering outlet, and an air outlet of the adsorption fan is communicated with an adsorption purification discharging pipeline.

The invention discloses a low-ozone device of an electrostatic air purifier. The low-ozone device comprises a capacitive isolator, an electrostatic adsorption structure, a tungsten filament, an electric field upper cover, an electric field lower cover and an electrode plate pressing strip. The low-ozone device of the electrostatic air purifier has the beneficial effects that the distance between terminals for fixing the tungsten filament is 124-135mm; optimal fixing points of the tungsten filament of an electrode are polarized through an electrostatic field, so that the resonance effect of the tungsten filament is greatly weakened, reduction of the charge energy of particles entering the electrostatic field is promoted, and generation of ozone is effectively reduced; the distance between a negative plate of the electric field and the tungsten filament is 6mm, and the one-time purification effect is optimal; the width of the negative plate of the electric field is 80.1-80.2mm, the width of a positive plate of the electric field is 58.7-58.8mm. Compared with the conventional negative plate of the electric field, the positive plate of the electric field and the negative plate of the electric field are widened by 30 percent, equivalent particles are removed, and the positive plate of the electric field and the negative plate of the electric field are shortened by 45 percent, so that the amount of the ozone generated by removal of the equivalent particles is obviously decreased.

The invention provides a paper mill sewage filtering device, and belongs to the technical field of sewage treatment. The paper mill sewage filtering device comprises a filtering box, wherein a water inlet is formed in one side of the upper portion of the filtering box, a water discharge opening is formed in the bottom of the filtering box, a filtering assembly is rotatably arranged in the filtering box, and the filtering assembly comprises a central ring and a plurality of filter screen assemblies which are rotatably arranged on the outer side of the central ring. In the paper mill sewage filtering device, through the filter screen assemblies which are rotatably arranged, fiber debris which is filtered out from papermaking sewage is taken away from a sewage filtering region, the filter screen assemblies are overturned by a cooperative turning plate assembly, the fiber debris on the upper portions of the filter screen assemblies is overturned to be on the lower portions, cleaning is conducted by a cooperative cleaning assembly, and the cleaned filter screen assemblies continue to rotate, and participate in sewage filtering again to achieve continuous non-stop filtering of the sewage, so that the situation that due to massive accumulation of fiber debris in sewage, filter screen assemblies are blocked, and normal flowing of the sewage is affected, so that the efficiency of purifying the sewage is reduced is avoided.

The invention provides a purification device unit and a purification device, and belongs to the field of purification equipment. The purification device unit comprises a casing assembly and a filtering assembly, wherein the casing assembly comprises a first casing and a second casing; a second smoke gas passage is formed between the first casing and the second casing; the second smoke gas passageis provided with an air inlet passage and an air outlet passage separated by a separation plate; an air outlet is formed in a casing wall, corresponding to the air outlet passage, of the first casing;the filtering assembly comprises a filtering screen disc, a transmission element and a flow guide impeller; the flow guide impeller can guide the airflow introduced into the filtering screen disc tothe radial direction of the filtering screen disc so that the airflow can be cut in the peripheral region near the filtering screen disc. The purification device unit solves the problem that the center region of the filtering screen disc can be easily blocked; partial smoke gas disengaged from the purification screen disc can enter the second smoke gas passage through a first smoke gas passage andis then filtered; the filtering efficiency is improved. The purification device comprises at least one purification device unit.

In an exhaust gas purification apparatus for an engine includes a bubble generation device, the bubble generation device for mixing nano-sized to micro-sized bubbles into a liquid reducing agent or a precursor thereof injection-supplied from an injection nozzle is disposed in a reducing agent supply system running from a reducing agent tank to the injection nozzle. When the liquid reducing agent or the precursor thereof is injection-supplied from the injection nozzle, the liquid reducing agent or the precursor thereof is divided by bubbles, and the bubbles are radically inflated and burst by a pressure change and a temperature change at the time of injection-supplying, so that microparticulation of the liquid reducing agent or the precursor thereof is facilitated.

The invention discloses domestic sewage treatment equipment for ships. The domestic sewage treatment equipment comprises a base and a sedimentation cylinder, wherein the sedimentation cylinder is mounted at the left end of the upper surface of the base through support rods; top ends of the support rods are fixedly connected with the sedimentation cylinder; a water inlet pipe is connected with thetop end of the left side of the sedimentation cylinder in a penetrating manner; a dryer is mounted in the center of the bottom surface of the top end of the sedimentation cylinder; a control switch ismounted at the upper end of the left side of the sedimentation cylinder; an ultraviolet lamp is mounted in the middle of the inner wall of the sedimentation cylinder; an ultraviolet lamp controller is mounted in the middle of the left side of the sedimentation cylinder; a filter residue collecting bin is fixedly connected with the bottom end of the sedimentation cylinder; a discharge port is connected with the center of the bottom surface of the filter residue collecting bin in a penetrating manner; a purification device is connected with the bottom end of the right side of the sedimentationcylinder through a water delivery pipe in a penetrating manner and comprises a casing, an activated carbon filter layer, an electric heating pipe, a temperature controller and a water drain pipe. Thedomestic sewage treatment equipment for the ships is simple to operate and high in sewage treatment efficiency and has high practicability.

The invention relates to the field of electrolytic packing preparation, and provides a method for synthesizing electrolytic packing in iron carbon through in-situ carbothermic reduction. The method comprises the following steps of oxidization modification, wherein coal pitch is dispersed into a Fenton reagent, the mass ratio of the coal pitch to the Fenton reagent is 1:(5-100), after a hydrothermal reaction is performed for 3-12 h at the temperature of 150 DEG C-250 DEG C, an active regulator is added, the hydrothermal reaction is continuously performed for 3-10 h at the temperature of 150 DEG C-200 DEG C, centrifugal separation is performed, and drying is performed for 4-6 h at the temperature of 120 DEG C-150 DEG C; in-situ reduction, wherein the obtained modified matter is roasted for 2-8 h at the temperature of 500 DEG C-1200 DEG C. The method is low in cost and simple in preparation process, and the prepared iron carbon packing is developed in pore structure and high in metal active component dispersity and wastewater treatment capacity.

The invention relates to a high-efficiency pulsed dust collector. The high-efficiency pulsed dust collector comprises a support, the support is provided with an ash bucket, the upper end of the left side of the ash bucket is provided with a dust gas inlet, the bottom of the ash bucket is provided with an ash discharge device, the ash discharge device is connected to a dust outlet, the ash bucket is connected to a dedusting box, a support rack is arranged in the dedusting box, the support rack is provided with a tube sheet, the tube sheet is fixedly provided with a venturi tube, the venturi tube is connected to a filter bag frame, the filter bag frame is connected to a dedusting filter bag, the dedusting filter bag is detachable, the tube sheet is provided with an injection pipe, the left side of the injection pipe is connected to an electromagnetic pulse valve, the bottom of the electromagnetic pulse valve is provided with an air pocket, the outer side of the air pocket is provided with a fixed frame and the fixed frame is fixed to the dedusting box through a fixing rack. The high-efficiency pulsed dust collector is easy to repair, has high pressure resistance, high safety, stability, fastness, high working efficiency, long service life and good sealing performances and prevents leakage efficiency reduction caused by air leakage.

The invention discloses a set of improved corner type air purification equipment, relates to the technical field of air purification, and solves the problem that the traditional air purification equipment is complex in structure and poor in purification effect. The equipment comprises a purifier body, an air inlet is arranged at the lower end on one side of the purifier body, and an air outlet isarranged on the other side of the purifier body. The equipment is characterized in that an one-way valve is arranged in the air inlet, a buffering surface is arranged on the purifier body, and a backflow prevention baffle is arranged in the purifier body; a water inlet channel is arranged on the outer side of the upper end of the purifier body, and a nozzle which is communicated with the water inlet channel is arranged on the inner side of the upper end of the purifier body; baffles and filtering layers are arranged in the purifier body, and the pore sizes of the filtering layers are different; and a water discharging slot is formed in the lower end face of the purifier body, and the one-way valve and the water discharging slot both are connected with water outlet pipes. The equipment hasthe advantages of being simple in structure, wide in application range, good in purification effect and free from noise.

The invention discloses a lampblack flue gas purification treatment material. The flue gas purification treatment material is mainly prepared from a carbon-based component, an inorganic mineral adhesion component, an inorganic adsorption component, a noble metal catalyst component, a non-noble metal catalyst component and an auxiliary agent, wherein the content of each raw material is as follows in percentage by mass: 60 to 90 percent of the carbon-based component, 10 to 40 percent of the inorganic mineral adhesion component, 3 to 10 percent of the inorganic adsorption component, 0.02 to 0.12percent of the noble metal catalyst component, 0.5 to 20 percent of the non-noble metal catalyst component and 0.6 to 2.5 percent of the auxiliary agent. All the components are prepared into the multifunctional, efficient, long-effect, integrated, high-strength and low-attenuation lampblack flue gas purification treatment material according to a certain preparation technology. The composite material can be used for carrying out efficient and rapid absorption and catalytic decomposition on multi-component VOCs (Volatile Organic Compounds) with different types in lampblack flue gas generated ina kitchen. Meanwhile, the flue gas purification treatment material has the characteristics of low cost, low air resistance, low noise, low energy consumption and the like, and the blank of a current market that the purification efficiency on the lampblack flue gas VOCs of the kitchen is low is filled up.

A water purification system using bioremediation plants can comprise: a plurality of bioremediation plants to be planted on the surface of the earth having a slope; a plurality of water permeable blocks formed or buried on the surface of the earth around at least one bioremediation plant among the bioremediation plants, and into which waste water flowing on the surface of the earth flows; and a plurality of perforated pipes through which the waste water, which has flowed in through the water permeable blocks, flows and buried below the surface of the earth at a depth corresponding to the upper roots of the bioremediation plants. Waste water flowing through the perforated pipes is transferred to the roots of the bioremediation plants through the perforated pipes, filtered water to be discharged from the bioremediation plants flows into the perforated pipes, and the filtered water can converge with the waste water, which flows through the perforated pipes, so as to flow.

A method for separating electrically charged species contained in a solution by an isotachophoresis method applied in an electrophoresis device, the isotachophoresis method being coupled to isotopic measurement using a mass spectrometer. The method notably comprises a step of stopping the voltage applied to the terminal of the electrophoresis capillary and transient application of a counter-pressure making it possible to utilize the length of the capillary several times and extend the separation distance artificially.

The invention discloses a new process for semi-ecological sewage treatment, which comprises a sewage treatment tank, a sewage storage room is arranged at the lower part of the sewage treatment tank, a support layer is set above the sewage storage room, a filter material layer is provided above the support layer, and a filter material layer is arranged above the support layer. The material layer includes a filter layer and an organism ecological treatment layer. An aeration pipe is provided at the bottom of the sewage holding room. The bottom of the sewage holding room is also connected to a water inlet pipe. The other end of the water inlet pipe is connected to a sewage separator. The sewage separator includes a separation device and Circulating water treatment device. By combining physical purification and biological purification, the present invention avoids the problem of long purification time in the simple ecological treatment of sewage, and at the same time avoids the excessive pollution of sewage entering the ecological sewage treatment pool, which will cause the microorganisms to be in the sewage The environment is harsh, which leads to low sewage treatment efficiency, poor water quality after treatment, and the phenomenon that the water cannot be completely up to standard, which can ensure that the sewage can be completely purified.

The invention relates to the field of electrolytic packing preparation, and provides a method for synthesizing electrolytic packing in iron carbon through in-situ carbothermic reduction. The method comprises the following steps of oxidization modification, wherein coal pitch is dispersed into a Fenton reagent, the mass ratio of the coal pitch to the Fenton reagent is 1:(5-100), after a hydrothermal reaction is performed for 3-12 h at the temperature of 150 DEG C-250 DEG C, an active regulator is added, the hydrothermal reaction is continuously performed for 3-10 h at the temperature of 150 DEG C-200 DEG C, centrifugal separation is performed, and drying is performed for 4-6 h at the temperature of 120 DEG C-150 DEG C; in-situ reduction, wherein the obtained modified matter is roasted for 2-8 h at the temperature of 500 DEG C-1200 DEG C. The method is low in cost and simple in preparation process, and the prepared iron carbon packing is developed in pore structure and high in metal active component dispersity and wastewater treatment capacity.

The invention relates to a fume purification system and a working method thereof. A purification host of the fume purification system comprises a closed shell, wherein a partition board is arranged in the shell; a gap is formed between the top of the partition board and the inner wall of the shell, and the other parts of the partition board are in tight coupling with the inner wall of the shell; a plurality of metal tubes are alternately and vertically distributed on two sides of the partition board in the shell; a metal rib is arranged on the central axis in each metal tube, and gaps formed between middle upper parts or the adjacent tops of the every two adjacent metal tubes, between the partition board and the middle upper parts or the adjacent tops of the every two adjacent metal tubes and between the inner wall of the shell and the middle upper parts or the adjacent tops of the every two adjacent metal tubes are closed; a space is formed between the bottom of each metal tube and the inner wall of the bottom of the shell and is divided into a first buffer region and a third buffer region by the partition board; a space is formed between the top of each metal tube and the inner wall of the top of the shell to form a second buffer region; an air inlet and an air outlet of the shell are formed close to the middles or the middle upper parts of the metal tubes located at the front and rear ends.

The invention discloses a method and device for purifying particulate matters and volatile organic compounds in catering oil smoke by utilizing a synergistic effect of low temperature plasma and catalysts. The method comprises the following steps: enabling the oil smoke to sequentially pass through a low temperature plasma reaction area and a catalytic reaction area, wherein the volatile organic compounds contained in the oil smoke are partially oxidized in the low temperature plasma reaction area and are further oxidized in the catalytic reaction area. On the front section of the low temperature plasma reaction area, the particulate matters contained in the oil smoke are separated, removed or charged by alternately arranged positive and negative polarity high-voltage discharge; on a transition section of the low temperature plasma reaction area, particles with positive charges and negative charges are close and are subjected to coagulation growth; on a rear section of the low temperature plasma reaction area, the particles are continuously subjected to the coagulation growth and are captured and separated. According to the method, the function of efficiently purifying the volatile organic compounds is increased; the efficiency of removing the particulate matters contained in the oil smoke is relatively high; the normal temperature operation can be realized, the fouling resistance is high, and the method is particularly suitable for being used for performing oil smoke treatment in public places such as various dining halls, public houses and hotels.