379 results about "Oxidation zone" patented technology

A process is provided for combusting a low heating value fuel gas in a combustor to drive an associated gas turbine. A low heating value fuel gas feed is divided into a burner portion and a combustion chamber portion. The combustion chamber portion and a combustion air are conveyed into a mixing zone of the combustor to form an air / fuel mixture. The burner portion is conveyed into a flame zone of the combustor through a burner nozzle while a first portion of the air / fuel mixture is conveyed into the flame zone through a burner port adjacent to the burner nozzle. The burner portion and first portion of the air / fuel mixture are contacted in the flame zone to combust the portions and produce flame zone products. The flame zone products are conveyed into an oxidation zone of the combustor downstream of the flame zone while a second portion of the air / fuel mixture is also conveyed into the oxidation zone. The second portion is combusted in the oxidation zone in the presence of the flame zone products to produce combustion products. The combustion products are conveyed into the associated gas turbine and drive the gas turbine.

Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a crystallization zone to from a crystallized product. The crystallized product is further cooled in a cooling zone and subsequently filtered and dried in a filtration and drying zone. The process produces purified carboxylic acid product having good color and low impurity levels without the use of purification steps like hydrogenation.

Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a crystallization zone to from a crystallized product. The crystallized product is further cooled in a cooling zone and subsequently filtered and dried in a filtration and drying zone. The process produces purified carboxylic acid product having good color and low impurity levels without the use of purification steps like hydrogenation.

A process is disclosed that relates to the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream and then routing the mother liquor and or wash filtrate to an oxidation zone.

The invention provides a method for removing various gaseous pollutants from smoke gas, which is used for solving the problem of limitation of the control and government technology on various pollutants in the smoke gas. The invention utilizes an absorption tower for fully removing SO2, NOX, mercurial vapor and CO2 in the smoke gas, the lower part of the absorption tower is provided an absorptionpulp tank, the middle of the absorption tower is provided with a spraying pipe, the upper part of the absorption tower is provided with an oxidizing agent pipe, the absorption tower is provided with partition boards in the vertical direction, both sides of the partition boards are respectively a desulfurization work section and a denitration and decarburization work section, the upper part of theabsorption tower is a communication oxidization region, the smoke gas enters the desulfurization work section from an inlet of the absorption tower to complete the removal of SO2 and HCL, the smoke gas continuously goes upwards to enter the oxidization region, and NOX is oxidized into water-soluble high oxide in the oxidization region and then enters the denitration and decarburization work section to complete the removal of the NOX, the mercurial vapor and the CO2. The invention breaks through the technical bottlenecks of complicated equipment and high running cost for simultaneously removing various gaseous pollutants from the smoke gas in the prior art. The process method and the device of the invention have the unique novelty.

The present invention discloses a gasifier and / or a gasification process that provides a long, uniform temperature zone in the gasifier, regardless of the particle size, chemical composition, and moisture content of the fuel by sandwiching a reduction zones between two oxidation zones. The gasifier and / or gasification process has a char that is more energy-dense and almost devoid of moisture that affords for an additional (or char) oxidation zone with a temperature that is higher than a first oxidation zone which is closer to a evaporation and devolatilization zone. As such, the additional (or char) oxidation zone contributes to augmenting the reduction zone temperature, thereby providing a favorable dual impact in improving syngas composition and near-complete conversion of the tar.

Disclosed is a process to produce a dry purified carboxylic acid product comprising furan-2,5-dicarboxylic acid (FDCA). The process comprises oxidizing a feed stream comprising at least one oxidizable compound to generate a crude carboxylic acid slurry comprising FDCA, removing impurities from a crude carboxylic acid slurry via oxidative purification in a low temperature post-oxidation zone to form a low impurity slurry stream. The low impurity slurry stream is further treated in a high temperature post oxidation zone to produce a secondary oxidation slurry stream which is routed to a crystallization zone to from a crystallized slurry stream.

The invention discloses an absorption tower for desulfurization and denitrification combined with an oxidant in forward-flow and back-flow spraying mode and a method. The absorption tower includes two washing sections: a first section is a desulfurization loop and arranged on the lower portion of the absorption tower, and sulfur dioxide and hydrogen chloride are removed through slurry forward-flow and back-flow and smoke contact cleaning; a second section cleans oxidized smoke pollutants in slurry back-flow and smoke contact mode mainly for removing oxynitride and heavy metal mercury. A slurry divider is arranged between the two cleaning sections, the bottom of the slurry divider is an oxidization area, and strong oxidant is sprayed in the area. For reducing consumption of the oxidant, a catalyst is added in second-loop slurry for achieving auxiliary oxidization. Sulfur dioxide, oxynitride, heavy metal mercury and the like can be removed simultaneously in a washing tower by the technology, and the absorption tower has the advantages of being high in efficient and simple and suitable for various combustion devices including fuel coal power stations, refuse incineration plants, organic and inorganic production enterprises and the like.

The object of the invention is a combustion method for a solid feed using a chemical loop wherein an oxygen-carrying material circulates, said method comprising at least:contacting the solid feed particles in the presence of metallic oxide particles in a first reaction zone (R1) operating in dense fluidized bed mode,carrying out combustion of the gaseous effluents from first reaction zone (R1) in the presence of metallic oxide particles in a second reaction zone (R2),separating in a separation zone (S3) the unburnt particles and the metallic oxide particles within a mixture coming from second reaction zone (R2),re-oxidizing the metallic oxide particles in an oxidation zone (R4) prior to sending them back to first zone (R1).

The present invention disclosed herein is directed to nitric acid regeneration fuel cell systems that comprise: an anode; a cathode confronting and spaced apart from the anode; an anolyte flowstream configured to flowingly contact the anode, wherein the anolyte flowstream includes a fuel, preferably methanol, for reacting at the anode; a catholyte flowstream configured to flowingly contact the cathode, wherein the catholyte flowstream includes nitric acid for reacting at the cathode to thereby yield cathode reaction products that include nitric oxide and water in a catholyte effluent flowstream; and a hydrogen peroxide flowstream configured to contact and react hydrogen peroxide with the nitric oxide of the catholyte effluent flowstream at a hydrogen peroxide oxidation zone to thereby yield a regenerated nitric acid flowstream. The regenerated nitric acid flowstream is preferably reused in the catholyte flowstream.

Disclosed is a process to produce a dry purified carboxylic acid product comprising furan-2,5-dicarboxylic acid (FDCA). The process comprises oxidizing at least one oxidizable compound to generate a crude carboxylic acid slurry comprising FDCA, removing impurities from a crude carboxylic acid slurry in a liquid displacement zone to form a low impurity slurry stream. The low impurity slurry stream is further treated in a secondary oxidation zone to produce a secondary oxidation slurry stream which is routed to a crystallization zone to form a crystallized slurry stream. The crystallized slurry stream is cooled in a cooling zone and the resulting cooled crystallized slurry stream is routed to a solid-liquid separation zone to generate a purified wet cake stream comprising FDCA that is dried in a drying zone to generate a dry carboxylic acid product stream comprising purified FDCA (pFDCA).

The process of the present invention involves reducing the sulfur and / or nitrogen content of a distillate feedstock to produce a refinery transportation fuel or blending components for refinery transportation fuel, by contacting the feedstock with an oxygen-containing gas in an oxidation zone at oxidation conditions in the presence of an oxidation catalyst comprising a zeolitic material, TIQ-6, whose chemical composition corresponds to the formula, expressed as oxides, SiO2:z ZO2:m MO2:x X2O3:aH2O Wherein Z is Ge, Sn,z is between 0 and 0.25 mol.mol−1 M is Ti or Zr, M has a value between 0.00001 and 0.25, preferably between 0.001 and 0.01, and a=has a value between 0 and 2.

The invention discloses a preparation method for a silver tin oxide electrical contact material, which comprises the following steps: by taking a silver ingot, a tin ingot, an indium ingot and an additive ingot as raw materials, atomizing the raw materials to prepare a silver tin alloy powder; ingoting, sintering, extruding and drawing / rolling the silver tin alloy powder to prepare a wire material or a sheet plate or a belt material; and finally, carrying out internal oxidation to prepare the silver tin oxide electrical contact material. The preparation method for the silver tin oxide electrical contact material has the characteristics of uniform and stable contact material components, no conventional internally oxidized central lean oxidation zone, high density, high hardness and the like. The preparation method for the silver tin oxide electrical contact material has a simple process and is suitable for mass production. A prepared silver tin oxide product can be widely used for relays and contactors.

Disclosed is a process to produce a dry purified carboxylic acid product comprising furan-2,5-dicarboxylic acid (FDCA). The process comprises oxidizing a feed stream comprising at least one oxidizable compound to generate a crude carboxylic acid slurry comprising FDCA, removing impurities from a crude carboxylic acid slurry via oxidative purification in a low temperature post-oxidation zone to form a low impurity slurry stream. The low impurity slurry stream is further treated in a high temperature post oxidation zone to produce a secondary oxidation slurry stream which is routed to a crystallization zone to from a crystallized slurry stream.

The invention provides a heterogeneous catalysis and ozone oxidation method, and an apparatus thereof. The apparatus is characterized in that: with adopting a coupling method of sectional ozone oxidation and catalytic oxidation, most organic matters can be removed through the ozone oxidation reaction in a ozone oxidation zone, wherein the most organic matters can be oxidized by the ozone; the generated organisms hard to be oxidized by the ozone from the reaction and the original refractory organic matters in the waste water react with hydroxyl radicals generated through the catalysis in a catalytic oxidation zone to generate low molecular weight compounds, carbon dioxide and water, such that the organic matters in the waste water are substantially reduced, and the biodegradability is improved; the catalytic oxidation zone adopts two catalysts of a regular catalyst and a porous catalyst such that a uniform water distribution effect and a uniform gas distribution effect are provided, the degradation of the organic matter can be efficiently catalytically oxidized. According to the method and the apparatus provided by the present invention, the refractory organic matters in the waste water can be removed, the utilization efficiency of the ozone is improved, the apparatus has characteristics of simple structure and easy operation, the method is an efficient and low-cost waste waterdeep treatment method.

One exemplary embodiment can be a process for removing one or more disulfide compounds from a caustic stream. The process can include passing the caustic stream, previously contacted with a hydrocarbon stream for removing one or more mercaptans, through a column to remove the one or more disulfide compounds downstream of a mercaptan oxidation zone.

The invention provides a multistage efficient ozone air floatation integrated device. A dissolved air floatation zone and an ozone oxidation zone are arranged reasonably so that dissolved air floatation zone and ozone oxidation are vertically combined in a column and multistage oxidization is realized; solid-liquid separation of insoluble floc particles and water is completed by virtue of dissolved air floatation, and then decolorization, deodorization, organic matter removal and sterilization are realized by virtue of ozone oxidization. The multistage efficient ozone air floatation integrated device is used for performing air floatation treatment and multistage oxidization on treated water; as a result, the shortcoming of low utilization rate of ozone is overcome, the minimization of energy consumption is realized, the utilization rate of ozone is greatly increased and the effect of sewage deep treatment is effectively guaranteed.

A batch treatment system that provides wastewater treatment one batch at a time, rather than a continuous flow process. In a basic embodiment, the batch treatment system incorporates two zones: (1) a solids separation zone, and (2) an advanced oxidation zone. More advanced embodiments add a filtration zone after separation and before advanced oxidation. The batch treatment system is particularly useful in applications such as ships because (1) reduced size and weight requirements, (2) the reduction of sludge and organic solids saves space and energy and disposal costs, and (3) the reduction of odors permits shipboard treatment rather than holding in tanks for later discharge.

A method for using a downdraft gasifier comprising a housing and a refractory stack contained within the housing. The refractory stack may comprise various sections. Apertures in the sections may be aligned to form multiple columnar cavities. Each columnar cavity may comprise an individual oxidation zone. The method of use may include the steps of placing a feedstock into an upper portion of the refractory stack, measuring the temperature of each columnar cavity, and adjusting the flow of oxygen to a particular columnar cavity to maintain the temperature of the particular columnar cavity within a particular range.

The invention discloses a continuous lead-smelting device which comprises a reaction furnace, a side-blown spraying gun for an oxidation zone and a side-blown spraying gun for a reduction zone, wherein, the reaction furnace is internally equipped with a partition wall for dividing a furnace chamber of the reaction furnace into the oxidation zone and the reduction zone, the lower part of the furnace chamber forms a molten pool, the bottom of the partition wall is equipped with a communicating channel for communicating the oxidation zone with the reduction zone, the roof of the oxidation zone is respectively equipped with a feed inlet for the oxidation zone and a flue gas outlet for the oxidation zone respectively, the roof of the reduction zone is equipped with a reductant feed inlet and a flue gas outlet for the reduction zone, and the furnace wall of the furnace chamber is equipped with a siphon lead discharge port and a slag discharge port; the side-blown spraying gun for the oxidation zone is connected with the side wall of the oxidation zone of the reaction furnace so as to laterally blow oxygen into the molten pool of the oxidation zone; and the side-blown spraying gun for the reduction zone is connected with the side wall of the reduction zone of the reaction furnace so as to laterally blow fuel and oxygen into the reduction zone. The continuous lead-smelting device disclosed by the invention has the advantages that oxidation and reduction are realized in single reaction furnace, lead content in slag is low, stability and tightness are good, environmental protection property is high, heat content of the slag is fully utilized and energy consumption is lowered. The invention further provides a continuous lead-smelting process.

The invention discloses a device and a method for continuously refining waste red-impure-copper. The device comprises a pre-oxidation shaft furnace, an oxidation furnace and a reducing furnace. An inner chamber of the oxidation furnace comprises an oxidization area, an acid slag clarifying area, a basic slag area and a basic slag collection area. The method comprises the following steps: (1) adding the waste red-impure-copper to the pre-oxidation shaft furnace for pre-oxidation, and allowing the impure copper solution to flow into the oxidization area of the oxidation furnace; (2) performing oxygen-enriched oxidation in the oxidation area, allowing the acid slag to flow into the acid slag clarifying area and then discharging the acid slag, and allowing the copper solution to flow into the basic slag area; (3) producing the basic slag in the basic slag area, discharging the copper solution containing heavy impurities, and allowing the basic slag and the pure copper solution to flow into the basic slag collection area; (4) discharging the basic slag from the furnace body, and allowing the pure copper solution to flow into the reducing furnace; and (5) reducing the pure copper solution in the reducing furnace. In the method, melting, oxidation and slag discharge as well as reduction occur in three furnaces respectively, thus realizing continuous copper production and continuous slag discharge, and being capable of reducing energy consumption and lowering labor intensity.

The invention discloses a whole-process low-nitrogen combustion technology applied to a cement kiln for reduction of the cement kiln NOx discharge quantity. Preheaters, a decomposing furnace, a rotary kiln, a coal injection pipe, a tertiary air pipe as well as pulverized coal and raw material feeding of a kiln system are taken as a whole for systematic control, a user starts from inhibition of generation of NOx and reduction of generated NOx to scientifically and reasonably adjust and control the quality of the rotary kiln, the quality of decomposing furnaces, the quality of fuel, the mass of the fuel, reasonable distribution of a combustion device and combustion-supporting air and the like, and the temperature field and the atmosphere field of the kiln are systematically controlled. The technology mainly comprises a cooling machine (1), the rotary kiln (2), a kiln head pulverized coal combustion device (3), the decomposing furnace (4), a kiln tail pulverized coal combustion device (5), the tertiary air pipe (6), an air dividing pipe (7) of the tertiary air pipe (6), a fourth-stage suspending preheater (8), a fifth-stage suspending preheater (9) and a discharging pipe (10), wherein the rotary kiln (2) comprises an oxidation zone (11) and a reduction zone (12), and the decomposing furnace (4) comprises an oxidation zone (13) and a reduction zone (14).

Systems and methods for biological and chemical gas treatment are disclosed. The systems may generally include a biological treatment zone and a chemical oxidation zone. An oxidizing agent subsystem may deliver an oxidizing agent, such as chlorine dioxide, to the chemical oxidation zone. The oxidizing agent subsystem may generate the oxidizing agent in situ from a product of the biological treatment zone. The oxidizing agent subsystem may include a reaction chamber and a source of a reactant, such as an alkaline metal chlorite reservoir. A controller may be in communication with various sensors and other components to generally manage operation of the disclosed systems.

The invention relates to a bacterial-algal symbiotic system and a short time contact oxidation integrated sewage treatment method comprising the following steps: 1. the sewage which flows into a sedimentation zone by an inlet pipe is conducted sedimentation and clarification treatment; 2. the sewage after primary clarification flows through the bacterial-algal symbiotic system formed by a grid and a multi-surface hollow vector on which fixed surface biofilms and bacteria-algae are adsorbed from below to above; 3. the effluent from the bacterial-algal symbiotic system is conducted aerobic degradation in an aeration contact oxidation pond, the oxygenated water is partially returned to the inlet pipe through a stripping tube; 4. the effluent from the contact oxidation zone flows into the sedimentation zone through a diversion deaeration tube, the clarified effluent is discharged by an outlet tube. The method of the invention has advantages of low energy consumption and investment, small land occupation and lower running cost, and is easy to realize the scale production and application of the equipment.

The invention relates to an integrated farm waste treatment system. The integrated farm waste treatment system comprises a wastewater treatment system, a solid waste treatment system and an odor treatment system, wherein the wastewater treatment system comprises a wastewater regulating sedimentation tank, a baffled anoxic-anaerobic reaction tank, an aerobic contact oxidation tank, a secondary sedimentation tank, a sand filter tank and a clean water tank; the solid waste treatment system comprises a sludge concentration tank, a sludge filter press room, a solid waste mixing tank and a composing tank; and the odor treatment system comprises an odor collection tube, a draught fan and an integrated odor treatment device, and the integrated odor treatment device comprises a photocatalytic oxidation zone, an alkaline washing zone, a defogger, an activated carbon adsorption layer, an exhaust fan and branch legs.

The invention provides a membrane bioreactor device for retarding membrane pollution and a sewage treatment method. The membrane bioreactor device is characterized in that a three-phase separator is arranged in a membrane bioreactor, and a sewage treatment device with a membrane reaction zone at the upper part and a contact oxidation zone at the lower part is formed; sewage enters the contact oxidation zone from the bottom of the reactor and then enters the membrane reaction zone from a slit of the three-phase separator; under the combined action of the absorption of activated sludge and the interception of membranes, the treatment of the sewage is realized; with the adoption of a rotating membrane filtering component, the rotating shear force is increased to retard the membrane pollution, and meanwhile, the fact that all the membranes have uniform cleaning strength is guaranteed, and cleaning dead corners are reduced; the three-phase separator is connected with a gas guide tube, so that residual gas in the contact oxidation zone is guided into the membrane reaction zone at the upper part to be used as a gas washing source of a membrane component, therefore the energy consumption is reduced; online ultrasonic cleaning and chemical cleaning equipment is arranged to reduce the assembly and disassembly procedures in the membrane cleaning process. The sewage treatment device and method have the advantages of high treatment efficiency, small membrane pollution, stable effluent water quality and good convenience in operation and management.

The invention relates to a device for removing sulfur dioxide in waste gases, which comprises an absorption tower (1). The side surface of the middle of the adsorption tower (1) is provided with a waste gas inlet port (12). The adsorption tower (1) is internally provided with a liquid-gas distributor (3). The top of the adsorption tower (1) is provided with a clean gas discharge outlet (11) while the lower part of the adsorption tower (1) is provided with an absorption liquid concentration oxidation zone (13). The device is characterized in that the waste gas inlet port (12) is communicated with a cooling device in the adsorption tower (1); the gas outlet of the cooling device is arranged below the liquid level of the absorption liquid of the concentration oxidation zone (13); the concentration oxidation zone (13) is communicated with the inner chamber of the adsorption tower (1). The device has the advantages that the waste gas cooling is carried out in the cooling device in the adsorption tower (1); the temperature of the gas in the inner chamber of the absorption tower is reduced into 45 DEG C to 60 DEG C; as the temperature is lower, the absorption effect is better after the gas and the liquid contact; therefore, when the gas with low temperature enters into the adsorption tower, the absorption rate is drastically increased; the device causes that processes such as waster gas, temperature reduction, concentration absorption liquid, desulphurization, oxidation and the like are concentrated in a desulfurizing tower to be completed, thus simplifying the low, reducing the equipment investment, fully making the best of device space and optimal land utilization.

The invention provides an on-site purification system for urban black and smelly inland rivers, wherein a riverbed is directly used as a treatment space of polluted river water, a section of concrete embankment is arranged in a riverway along the flow direction, and the riverway is separated into two parallel areas of an area for river water treatment and an area for emergency drainage or passing, wherein in the area for river water treatment, four treatment units of a lift pump well, a reaction area, a sediment area and an aeration area are arranged and are communicated with one another along the flow direction, so a complete water treatment facility is formed, the reaction area consists of an ozone contact oxidation zone and a flocculation zone, and the tail end of the aeration area adopts a drop dam mode; and the area for emergency drainage or passing is used as an emergency drainage channel for a flood period and also serves as a passing channel of a pump dredger. The on-site purification system utilizes the treatment facility which is built in the riverbed to on site purify the quality of the urban inland rivers which are black and smelly due to the gathering of a large amount of domestic sewage, has a simple method and a simple structure, does not occupy lands, does not influence flood flowing, and has a good treatment effect.

The invention discloses a junction terminal structure of a lateral power device. The structure at least comprises three semiconductor doping regions, a side wall oxidation zone and a side wall field plate region, which are sequentially connected, wherein the side wall field plate region is positioned at the two ends of the device; the doping region positioned at one end is a first kind of conducting type and forms a channel region (or the anode) of the device; the doping region positioned at the other end is a second kind of conducting type and forms a drain electrode region (or the cathode) of the device; the semiconductor doping region positioned in the middle is the second kind of conducting type and forms a drift region of the device; the lower part of the drift region is connected with an epitaxial layer; the upper part of the drift region is connected with a field oxide layer; the side of the drift region is connected with an oxidation zone; polysilicon is etched and deposited in the side wall oxidation zones of a source area and a drain area to form a slope-shaped or multi-step shaped three-dimensional (3D) field plate; the field plate is in electric contact with a grid electrode and a drain electrode respectively; and the side wall field plate is required to extend into the surface of a substrate to enter the substrate. When a PN diode, a lateral diffused metal oxide semiconductor (LDMOS) or a lateral insulated gate bipolar transistor (LIGBT) is manufactured through the structure, the structure has the advantages of high breakdown voltage, low on resistance, simpleprocess, low cost and the like.

The invention discloses a research method suitable for characteristics of an interlayer oxidation zone of a sandstone-type uranium deposit. The research method comprises the steps of S01, establishing macro identification criteria for sandstone of each sub-zone of an interlayer oxidation zone of a target stratum in a research area; S02, acquiring samples and conducting a analytical test; S03, establishing geochemical indicators for each sub-zone of the interlayer oxidation zone according to results of the analytical test; and S04, conducting research on characteristics of each spatial sub zone of the interlayer oxidation zone according to the geochemical indicators for each sub-zone of the interlayer oxidation zone. Through research on the geochemical indicators for different sandstone in a known typical ore deposit in the research area, the invention establishes the geochemical indicators for determining oxidation sandstone, mineralization sandstone and native sandstone, and carries out promotion and application to the entire research area to find out spatial distribution characteristics of each sub-zone of the interlayer oxidation zone in the research area, so that the spatial distribution characteristics of each sub-zone of the interlayer oxidation zone in the research area can be more close to the actual situation, thereby providing more useful guidance to prospecting and exploration.