611 results about "Supercritical water oxidation" patented technology

The invention relates to a method and a device for oxidizing and treating sewage or sludge containing organic substances by supercritical water. The method adopts a combustion reaction furnace, and is characterized in that substance flow of the sewage or the sludge containing the organic substances and oxidant (such as oxygen or hydrogen peroxide and the like) are preheated by a heat exchange device respectively and then enter the combustion reaction furnace, the sewage or the sludge containing the organic substances is oxidized and treated under a supercritical state, the treated substance flow is cooled by the heat exchange device again, then residual gas in the substance flow is separated by adopting a gas-liquid separator, and the lower part of the combustion reaction furnace discharges salt slag through a slag discharging hole and a valve. The method has the advantages of reasonable and practical process, energy conservation and low operation cost.

The invention relates to a process by adopting supercritical water oxidation technology to treat coking wastewater or organic wastewater. The invention is that: coking wastewater or organic wastewater is pretreated to obtain wastewater without solid granules; the wastewater is heated to 380-450 DEG C with a first interchanger and/or a supercritical boiler, and then enters demineralizing equipment to remove the salt in the wastewater by taking advantage of the property that supercritical inorganic matter is indissoluble; the wastewater after desalting is put in a reaction kettle to generate autothermal reaction with an heated and pressurized oxidant to obtain high-temperature gas-liquid mixture with higher temperature; the high-temperature gas-liquid mixture enters the first interchanger and acts as thermal medium to exchange heat with new coming coking wastewater or organic wastewater and then goes through a secondary interchanger to enter a cooler and is cooled to normal temperature, after pressure thereof is adjusted by a pressure regulation device, the high-temperature gas-liquid mixture enters a gas-liquid separator for separation, and then the air is discharged, while the liquid, namely the treated water is recycled. The organic contamination and oxidant are all dissolved in the wastewater; oxidation reaction is generated in homogeneous phase, in short reaction time, oxygenolysis of organic contamination is carried out quickly.

The invention discloses a supercritical water oxidation reaction system for obtaining the heat supplemented by auxiliary fuel. The supercritical water oxidation reaction system comprises a reactor, a material device, an oxidant device, a desalting device, a fuel supplementing device and a cooling water device, wherein the material device is communicated with a material inlet on a reactor end cover; the oxidant device is communicated with an oxidant inlet on the reactor end cover; and the desalting device is communicated with a solid salt outlet at the bottom of the reactor. The energy is supplemented to the system by the auxiliary fuel, thereby reducing higher equipment input and operation cost brought by arranging an electric heater; by adopting the single-pass heat return, on the premise of ensuring the effective heat of a recovering system, the complexity of the system is reduced and further the equipment input is reduced and the operating and running stability of the system is improved; and a reasonable desalting scheme is provided for simultaneously desorbing solid salts and soluble salts generated in the reaction process. The supercritical water oxidation reaction system canbe widely applied to the innocent treatment process of high-condensation pollutants, such as organic wastewater/landfill leachate, and the like which are difficult to biochemically degrade.

The invention relates to a method for improving oxygen utilization rate of a supercritical water oxidation system. The method comprises the following steps of: injecting excessive oxygen and preheated organic waste liquid from the upper part of an evaporation wall reactor, mixing the oxygen and the organic waste liquid, performing supercritical water oxidation reaction on the mixture, and injecting evaporation water from the lateral surface of the evaporation wall reactor so as to form a supercritical temperature reaction area on the upper part and a sub-critical temperature salt dissolution area on the lower part in the reactor. When the reacted rest oxygen downwards flows to the sub-critical temperature salt dissolution area from the supercritical temperature reaction area, a part of oxygen is separated out and circulated to the supercritical temperature area on the upper part of the reactor to form internal circulation utilization of the oxygen; and the reacted fluid enters a high-pressure gas-liquid separator through condensation and pressure reduction, is dissolved into sub-critical water and carries the oxygen flowing out of the reactor, is separated by the high-pressure gas-liquid separator and then is re-injected to the reactor to form external circulation utilization. The method remarkably reduces the excessive oxygen amount coefficient by improving the utilization rate of the oxygen, and improves the running economy of the supercritical water oxidation system.

The invention discloses a supercritical water oxidation treatment system for printing and dyeing wastewater and sludge. The system comprises a concentration pretreatment device, a supercritical water oxidation device, an oxidizing agent supply device and a wastewater recycling system, wherein the concentration pretreatment device comprises a waste liquid storage tank, a nanofiltration membrane concentration module and a printing and dyeing sludge storage pool, the oxidizing agent supply device comprises a liquid oxygen storage tank, a liquid oxygen gasifier and a buffer tank, and the supercritical water oxidization device comprises an auxiliary heating supercritical water oxidization reactor, a methyl alcohol starting preheater, a methyl alcohol preheater and a waste liquid preheater. The system can be used for realizing efficient, clean and harmless treatment of high-concentration printing and dyeing wastewater and sludge at low cost.

The invention discloses a supercritical water oxidation reactor by using an auxiliary fuel for supplying heat, the heat required for a reaction can be supplied by using the auxiliary fuel, Material, fuel and an oxidizing agent (air or oxygen) are mixed with a high efficiency through the different directional jets for raising oxidation efficiency. According to the invention, the reactor employs a combination structure of evaporation wall and pot type backflow, the reaction vessel volume is effectively used and the reaction time is increased, the blockage problem generated by salt deposition can be also prevented, the corrosion problem of the reactor is effectively reduced. The temperature of the reactor bottom can be preciously controlled through a cooling water pipeline at the reactor bottom, thereby the safe operation of equipment is guaranteed. The reactor effectively solves the economic problem of a supercritical water reaction system by using the auxiliary fuel for supplying, the invention has the advantage of easy industrial amplification, and is widely applied to organic liquid such as high density and difficult biodegradation organic waste water/garbage leachate and the like for a harmlessness processing.

The invention relates to a high concentrated organic compound wastewater treating method in the acrylic acid production, including that firstly oxidant and deionized water are mixed for preparing oxidant solution and is put in an oxidant tank. Secondly, wastewater and clear water for the acrylic acid production are respectively arranged in a wastewater tank and a clear water tank and catalysts are added in the wastewater. Thirdly, a pre-heater is heated to be at the temperature of 300-400 degree Celsius and a reactor is heated to be at the temperature of 400-600 degree Celsius. Fourthly, a high pressure plunger pump is opened, in which a sampler is put. The wastewater and the oxidant solution enter a microporous ceramic tube of the reactor after being preheated and pressurized respectively. The supercritical water oxidation under the pressure of 22-28MPa and the temperature of 374-600 degree Celsius is implemented. The clear water infiltrates into the microporous ceramic tube through an exine of a ceramic film. Fifthly, the treated effluent is qualified to be discharged through the cooling and the gas-liquid separation. The invention solves problems of the reactor inner wall corrosion and the tube blockage of a traditional supercritical water oxidation technology. The organic removal rate reaches to 99.99 percent above. And no secondary pollution can be made. The invention is friendly to the environment.

The invention provides a method for treating refractory wastewater by virtue of a supercritical water oxidation technology. The method comprises the following steps of: feeding the preheated wastewater into a salt separator for supercritical desalination, heating an oxidant which is preheated previously through a heat exchanger to a desired temperature, feeding the heated oxidant and the desalinated wastewater into a supercritical water oxidation reactor from the two ends of the reactor, respectively, controlling the system pressure by a back pressure valve, and carrying out a supercritical water oxidation reaction to degrade pollutants in the wastewater into non-toxic matters such as CO2, N2 and H2O; feeding the clean high-temperature and high-pressure fluid obtained after the reaction into the heat exchanger to exchange heat with the wastewater and the oxidant, respectively, and then cooling and separating, returning the excessive oxidant to the supercritical water oxidation reactor and causing the liquid into a normal-pressure gas-liquid separator, discharging the gases such as CO2 and N2 through the top of the normal-pressure gas-liquid separator, and discharging the treated clean water from the bottom of the normal-pressure gas-liquid separator. The method for treating the refractory wastewater by virtue of the supercritical water oxidation technology has the advantages of being high in wastewater treatment efficiency without secondary pollution, and suitable for treating the refractory wastewater different in concentration.

The invention relates to an injection production process of fluids produced by supercritical water oxidation fluids. The fuel is injected from the top of an evaporation wall reactor after being boosted to 22.1-30 MPa; the air is injected from the top of the reactor after being boosted to the same pressure and pre-heated to reach 300-500 DEG C. Evaporable water is injected from the side surface of the evaporation wall reactor in two branches after being boosted to the same pressure as the fuel; the initial temperature of the evaporable water in the upper branch after being pre-heated is 400-600 DEG C; the evaporable water in the lower branch is at normal temperature. After the supercritical water oxidation in the reactor starts, the evaporable water in the upper branch declines to 250-370 DEG C. The fluid in the reactor flows out from the outlet of the reactor and then is injected to the oil well through an injection pipe after being regulated to 5-30 MPa by a pressure regulating valve; and the evaporable water with the same pressure is injected to the annular space between the injection pipe and a shaft. According to the injection production process, the multiple hot fluids produced when the fuel is processed by the supercritical water oxidation are injected to the oil well, so that the viscosity of the thickened oil is reduced, the oil productivity is increased and the application prospect is wide.

The invention provides a supercritical water oxidation treatment method for high-concentration organic wastewater, which comprises the following steps of: pressurizing, preheating, performing supercritical water oxidation reaction and the like. By limiting the content of chloride ions and the content of salt in the wastewater, equipment corrosion and pipeline blockage are controlled in a tolerable range; by controlling the COD concentration of the wastewater, the oxidation reaction is autothermal reaction; and by adopting a multi-tube reactor, the requirement on treatment equipment materials and the equipment processing difficulty are reduced. The method makes the TOC removal rate of over 99 percent, and has the characteristics of small reactor volume, short reaction time, high treatment efficiency, low energy consumption of running, continuous and stable running of the treatment system and the like.

The invention relates to a treatment system and a method for dyeing wastewater, which aims to solve the problem of difficult high concentration refractory dyeing and desizing wastewater treatment, and provides the system and the method for treating volumes of high concentration dyeing and desizing waste water by adopting the supercritical water oxidation technique. The treatment system has the technical proposals for realizing the invention that: the dyeing wastewater treatment system comprises a high pressure plunger pump, a feeding pipeline, a reactor and a first gas-liquid separator, the high pressure plunger pump, the reactor and the first gas-liquid separator are connected with one another sequentially through the feeding pipeline, and the system is characterized in that the treatment system is also provided with a high pressure storage tank, the high pressure storage tank is connected between the high pressure plunger pump and the reactor through the feeding pipeline, a valve is arranged on the pipeline between the high pressure storage tank and the reactor, and the high pressure storage tank is also equipped with a heater.

A method for oxidizing an organic material includes the steps of (a) forming a preoxidation mixture comprising the organic material and water, and (b) causing the preoxidation mixture to react with a liquid oxidizer in a continuous flow reactor supercritical conditions for water, including a pressure of at least 3206 psia and a temperature of at least 705° F., to form a post-oxidation mixture containing condensible material and non-condensible material, wherein substantially all of the organic material has been oxidized.

The invention discloses a supercritical water gasification-oxidation method for treating organic wastewater and recycling synthesis gas. The supercritical water gasification-oxidation method comprises the following steps that: (1) the organic wastewater enters a preheater and a supercritical water gasification device sequentially by a high-pressure pump, and oxygen is divided by a compressor, so that one part of oxygen enters the supercritical water gasification device; (2) fluid from an outlet of the supercritical water gasification device enters a high-pressure gas-liquid separator by a heat exchanger, the synthesis gas of H2, CO and CH4 on the upper part is recycled, the fluid at the bottom enters a heater and a supercritical water oxidation reactor sequentially, and the part of oxygen which is divided by the compressor enters the supercritical water oxidation reactor; and (3) the fluid passing through the supercritical water oxidation reactor passes through a cooler and a back pressure valve sequentially and is discharged under the condition of reaching the standard. The supercritical water gasification-oxidation method can be widely applied to the treatment of the high-concentration organic wastewater.

The invention relates to a small-size supercritical water oxidation reaction system which comprises a gas pressurization unit, a fuel pressurization unit, a material pressurization unit, a desalted water supply unit, a reactor unit and a gas-liquid separation unit, wherein the reactor unit comprises a reactor and a group of temperature sensors distributed in the reactor; the gas pressurization unit comprise an air pressurization unit; the fuel pressurization unit comprises a fuel tank, a fuel high-pressure pump and a fuel heater, which are connected through a fuel pipeline; the material pressurization unit comprises a material storage tank, a material high-pressure pump and a material heater, which are connected through a material pipeline; the desalted water supply unit comprises a desalted water storage tank, a group of metering pumps and a cooling water high-pressure pump; the metering pumps and the cooling water high-pressure pump are connected with the desalted water storage tank; and the gas-liquid separation unit comprises a liquid outlet pipeline and a gas-liquid separator. The invention further relates to a control method of the small-size supercritical water oxidation reaction system. The small-size supercritical water oxidation reaction system can be used for simulating a physicochemical reaction under severe conditions of supercritical water oxidation reaction to improve experimental environment.

In the water to be treated, a soluble phosphate and/or a photocatalyst of mixture formed from Pt, Ag, Pd, Au or Ru metal and sulfur compound as active component or sulfur compound in which the metal ions of Fe(3+), V(4+) or Ru (3+) is doped are added, the above-mentioned materials can raise the effects of high-temp. pyrolysis, photochemical oxidation, hydroelectric cavitation degradation and supercritical water oxidation produced in the discharge process so as to greatly raise the water treatment effect.

Supercritical water (SCW) systems and methods using the properties of supercritical water to allow a raw water stream including water and a contaminant to be purified. A supercritical water oxidation (SCWO), water purifier may generally include water and oxidizer (such as oxygen in air) pumping and mixing apparatus, a supercritical water reactor, and a system for separating the resultant purified water from other relatively harmless outputs of the supercritical water reactor.

The invention provides a supercritical water oxidation system using air as a protecting film and a reaction process. The system comprises a double-housing reactor, an organic wastewater inputting pipeline, an air inputting pipeline and a reactant discharging pipeline, wherein the double-housing reactor comprises a porous wall arranged at the outer part, and a bearing wall arranged at the inner part; a separating ring is arranged between the porous wall and the bearing wall; a waste liquid inlet is formed in the top part of the double-housing reactor, and while a reactor outlet is formed in the bottom part of the double-housing reactor; an upper air inlet and a lower air inlet are formed in the bearing wall; the organic wastewater inputting pipe is connected with the waste liquid inlet; two branches of the air inputting pipeline are respectively connected with the upper air inlet and the lower air inlet; the reactant discharging pipeline is connected with the reactor outlet. The system achieves upercritical water oxidation reaction and porous wall protection, and can avoid concentrated release of reaction heat in the upper part of the double-housing reactor because that the concentrated release of the reaction heat leads to overheat of the upper part of the double-housing reactor and excessively large axial temperature gradient and damage to the porous wall; meanwhile, the corrosion and salt deposition of the double-housing reactor can be avoided.

The invention discloses a supercritical water oxidation treatment system and technology for dyeing sludge. A sludge heater is used for preheating the sludge to reduce the viscosity of the sludge, and thus the mobility of the sludge is improved; methyl alcohol is used for auxiliary heating to serve as a system preheating heat source in the starting stage, and the problem of pipeline coking congestion caused by direct heating of materials is solved; the flowing speed of fluid is controlled to prevent solid particles from settling and causing blockage in a system conveying pipeline, and the safe reliability of operation of the system is improved. The pressure of the system is reduced in the mode of combining capillary tubes with a regulating valve, corrosion or blockage of the solid particles on a depressurizing valve under a large pressure drop condition is avoided, and the pressure of the system can be accurately controlled. Oxidation released heat of organic matter is recycled in the mode of preheating the sludge and generating steam, energy is used in a gradient mode, the energy utilization rate is maximized, and the economy of the system is improved.

A method for reducing inorganic contaminant levels during supercritical water oxidation (SCWO) is provided. The method utilizes a fluidized bed reactor wherein inorganic contaminants in the water precipitate out onto the catalyst. The clean water is reclaimed after oxidation of organic contaminants and reduction of inorganic contaminant levels.

The invention discloses a corrosion-resistant anti-clogging organic pollutant supercritical water oxidation system which comprises a raw material preheating and feeding device, an oxidation degradation device and a material discharging and cooling device. The oxidation degradation device comprises a gas-solid separator communicated with an oxidation reactor. The system separates water insoluble solids and inorganic salt which are carried by pollutants and generated a degradation process during an oxidation degradation process by virtue of the characteristic of extremely low solubility of the inorganic salt in supercritical water, thereby avoiding heat/mass transfer efficiency reduction as well as pipeline clogging which are caused by the deposition and attachment of the water insoluble solids and the inorganic salt on the inner wall of the system; meanwhile, saline solution caused by alkaline liquid introduction and corrosion reduction can also be prevented, and thus the corrosion-resistant anti-clogging organic pollutant supercritical water oxidation system is more environment-friendly compared with the conventional equipment; and additionally, the system is provided with the equipment with high anti-corrosion capability, uses less process water, is low in energy consumption, can run in an industrialization scale easily, and can be widely applied to bio-safety disposal and resource utilization of organic waste water/liquid, urban sludge and volatile poisonous substances.

The invention relates to a supercritical water oxidation reactor which consists of a reactor cylinder body (3), an oxidant distribution coil (11) and a heating device (12); the oxidant distribution coil (11) is arranged at the lower part of the reactor cylinder body (3), the heating device (12) is arranged at the bottom part of the reactor (3); wherein a pressure control valve (5) is arranged at the top part of the reactor cylinder body (3), an inorganic salt discharge valve (13) is arranged at the bottom part of the reactor cylinder body (3), an oxidant inlet connection tube (1) and a waste water inlet connection pipe (2) are arranged at the lower part of the reactor cylinder body (3), a clean water outlet connection pipe (6) is arranged at the upper part, wherein the oxidant inlet connection tube (1) is communicated with the oxidant distribution coil (11); and an oxidant tubearray (4) is arranged on the oxidant distribution coil (11). The supercritical water oxidation reactor integrates the reaction process and the separation process to a whole body, thereby having simple equipment structure, stable operation, low investment and maintenance cost, great liquid retention and ability of effectively preventing the deposition of inorganic salts.