WO2020207503A1 - Dispositif de combustion inverse à pression négative pour polluants huileux, et procédé de récupération d'huile - Google Patents

Dispositif de combustion inverse à pression négative pour polluants huileux, et procédé de récupération d'huile Download PDF

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Publication number
WO2020207503A1
WO2020207503A1 PCT/CN2020/086256 CN2020086256W WO2020207503A1 WO 2020207503 A1 WO2020207503 A1 WO 2020207503A1 CN 2020086256 W CN2020086256 W CN 2020086256W WO 2020207503 A1 WO2020207503 A1 WO 2020207503A1
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Prior art keywords
oil
negative pressure
air
burning
furnace
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PCT/CN2020/086256
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English (en)
Chinese (zh)
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陈辉华
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宇恒(南京)环保装备科技有限公司
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Publication of WO2020207503A1 publication Critical patent/WO2020207503A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/006—General arrangement of incineration plant, e.g. flow sheets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals

Definitions

  • the invention relates to an oil pollutant processing equipment, in particular to an oil pollutant negative pressure back-burning equipment for processing and recovering oil, and a method for recovering oil
  • oils are very wide, including natural petroleum, petroleum products, tar and its fractions, as well as edible animal and vegetable oils and fats.
  • various oil pollutants will be generated in the petrochemical industry, chemical and pharmaceutical engineering, metal smelting industry, food processing and production, among which oil pollutants produced by the petrochemical industry are the most common and severe.
  • a porous matrix material or catalyst is mixed with an organic substance and exposed to an oxidant to initiate self-sustained combustion of the mixture, or the porous matrix is treated after combustion to make the porous matrix material and the valuable inorganic substance
  • the ash content is physically separated; but generally speaking, the solid particle size of sludge in oil pollutants is mostly between 1 and 100 microns.
  • the oil pollutants produced are relatively dense, and it is generally not easy to let air pass or be exposed to oxidants. If a porous matrix material or catalyst is used to mix with oil pollutants, not only the processing capacity and processing efficiency will be greatly reduced, but also the investment in processing facilities, unit operation energy consumption and cost will be greatly increased.
  • the core of this type of technology is to burn all the oil in all oil pollutants, and there is no practical and better solution for recycling.
  • Petroleum in oil substances is generally a mixture of several different boiling point oil components. According to the number of carbon atoms in hydrocarbons and different boiling points, fuel gas, gasoline, kerosene, diesel, fuel oil, and heavy oil can be obtained by heating and fractionating the petroleum. , Asphalt, etc.; and the presence of heavy oil, asphaltenes or other organic matter in oil pollutants makes it more difficult to dispose of oil pollutants; but only high-boiling heavy oil, asphaltenes or other organic matter is ignited as energy supply. Through radiation, convection, and conduction, the internal combustible components and the surrounding similar materials are continuously dried, pyrolyzed, and spontaneously reacted. Finally, not only the organic components in the oil pollutants are removed, but the oil products can be recovered by condensation. , Such as gasoline, kerosene, diesel, fuel oil, etc., have not been reported on the disposal of oil pollutants. This needs to solve the technical problems of the combination of equipment layout, oxidation gas flow direction and recycling method.
  • the present invention provides a negative pressure back-burning equipment for oil pollutants and a method for recovering oil.
  • the purpose of the present invention is twofold: First, it overcomes the problems of the prior art’s harsh material requirements, complex pretreatment, high energy consumption, serious secondary pollution, complex equipment, and high operating costs, and expands the scope of oil pollutant treatment. ; Second, structure creation, using anti-burning technology, set the airflow direction and combustion direction to be along the direction of gravity, and apply cooling and recovery equipment to use the difference in the boiling point of different components of the oil organics in the oil pollutants, and only ignite the high boiling point Used heavy oil, asphaltenes or other organic matter as energy supply, and continue to dry, pyrolyze, and spontaneously react to its internal combustible components and surrounding mixtures through radiation, convection, and conduction, and ultimately not only achieve organic components in oil pollutants Removal is exhausted, and it can be transported by gravity and airflow, using natural condensation to recover petroleum products, such as gasoline, kerosene, diesel, fuel oil, etc.; thereby integrating and innovatively providing a highly efficient, energy-saving, thorough treatment, and environmentally friendly emissions Oil
  • oil pollutants in the present invention refers to liquid, semi-solid, and solid substances contaminated by oil substances or any component of oil substances, including woven bags and color bars contaminated by oil substances Sundries and bulk objects such as cloth, stones, and tiles are generally not single-component substances.
  • a negative pressure back burning equipment for oil pollutants which is composed of a negative pressure back burning reactor, a negative pressure fan system, a circulating pump and its pipeline system, and a cooling system.
  • the negative pressure back burning reactor includes a furnace body and an air inlet , Heating element, setter plate, the air inlet is set on the top of the furnace body, the heating element is installed on the upper part of the furnace, the setter plate has openings, and the setter plate is installed on the lower part of the furnace body.
  • the cooling system includes cooling Zone, circulation pump, circulation pipe and air-cooled heat exchanger.
  • the cooling zone is connected with the bottom of the negative pressure back-burning reactor.
  • the side wall of the cooling zone is provided with a negative pressure suction port, oil discharge port and drain port from top to bottom.
  • the lower part is connected to the circulating pump through the circulating pipe, and then connected to the air-cooled heat exchanger through the circulating pipe.
  • the liquid outlet of the air-cooled heat exchanger is connected back to the cooling zone through the circulating pipe to form a circulation.
  • the negative pressure exhaust port is connected with a negative pressure fan .
  • the oil and drain outlets regularly discharge and collect recovered oil and excess water.
  • a certain structure of oil skimming and slag discharge devices can be installed to prevent clogging.
  • the heating element is an infrared heat radiation heating element.
  • the upper part of the infrared heat radiation heating element is 10 to 500 mm away, and a reflector is installed.
  • the element is coated with high temperature reflective paint toward the inside of the radiation heating element, and several air holes with a diameter of 5 to 50 mm are provided.
  • Ordinary heating elements can generate enough heat to initiate the reaction, but radiant heating elements are more suitable for the top-down initiation requirements of the present invention, especially infrared heating elements that can generate radiation.
  • the radiant heat accounts for more than 50% of the total calorific value. Better.
  • a filter screen is provided on the perforated setter plate, and the mesh number of the filter screen is 10-100 meshes.
  • the setter plate cannot prevent the mixture or ash from entering the cooling zone of the cooling system on the basis of load-bearing. After the ash enters, it is easy to cause pipeline blockage or poor purity of the recovered oil. Therefore, adding a filter screen can meet the isolation of ash .
  • the air-cooled heat exchanger is composed of finned heat exchange tubes and a blower.
  • the liquid inlet of the air-cooled heat exchanger is connected to the circulating pump, and the outlet extends into the cooling zone of the cooling system.
  • the inlet of the blower is connected to air, and the outlet is connected to the furnace.
  • the air inlet of the body is connected.
  • the hot air generated by the air-cooled heat exchanger is introduced into the air inlet of the reactor to save energy.
  • the air-cooled heat exchanger can be equipped with a refrigeration dryer or other existing cold sources to provide a flowable cooling medium at -60 ⁇ 10°C.
  • the hair dryer is equipped with a motor vector inverter. According to temperature monitoring, when the circulating water temperature is high, increase the speed and increase the heat dissipation to ensure the cooling effect.
  • the negative pressure fan is one or more of a Roots blower, a high-pressure centrifugal fan, and a vacuum pump, and the negative pressure fan is also equipped with a motor vector inverter.
  • the pressure difference can be controlled by the vector inverter of the motor to increase or decrease the amount of air sucked in to facilitate the initiation and control of the temperature and speed of the anti-burning.
  • a liquid distribution pipe is installed in the cooling zone, the liquid distribution pipe is connected to the liquid outlet of the heat exchanger, and the liquid distribution pipe is provided with nozzles and several nozzles.
  • the temperature is about 0 ⁇ 500°C; in order to achieve a good cooling effect, the waste water collected from the bottom of the furnace is pumped to the air-cooled heat exchanger by a circulating pump. After the heat exchange and cooling, the waste water is fogged
  • the chemical nozzle atomizes the waste water into fine droplets, and directly and instantaneously contacts the oil and organic gas for cooling, and transforms the water vapor and oil in the oil and organic gas from the gas phase to the liquid phase, thereby achieving separation.
  • the online detector detects at least one of the following Or a variety of the above data: CO, CO 2 , VOCs, NOx, and transmit the data to the system control platform, generate curves and data analysis on the computer display, of course, in order to run the data detection validity, it must be supplemented with the same parameter handheld detection Instrument interval detection.
  • the present invention also provides a method for recovering oil, which uses the above-mentioned negative pressure back-burning equipment to operate, and the specific recovery method steps are as follows:
  • Sorting and granulation the oil pollutants are screened out with woven bags, color striped cloth, stones, tiles and other debris ⁇ 50mm in the oil pollutants through the screening equipment, mashed and crushed to After ⁇ 50mm, add to other liquid, semi-solid and solid oil contaminants to mix and stir, use a hardening granulator, and auxiliary heating to dry, forming a surface-dry hardening irregular mixture.
  • Initiation of ignition turn on the negative pressure fan, adjust the suction of the negative pressure fan, suck air or hot air into the furnace from the top, and form an internal environment with a negative pressure ranging from -100Kpa to -0.1Kpa, and turn on the top heating
  • the temperature rise rate of the temperature detector 100 ⁇ 500mm away from the thermal radiation heating element is monitored to reach 5 ⁇ 50°C/min, and the VOCs and CO gas concentration of the exhaust air of the negative pressure fan are detected online respectively reach 50ppm and 1000ppm
  • the maximum The temperature of the upper mixture rises to 200-600°C under the reaction conditions to complete ignition.
  • the medium After the medium is condensed into a liquid phase, it flows out of the setter; then as the temperature further rises, high boiling point oil pollutants are cracked into low-molecular oil and gas, which advances downwards with the airflow, and part of it becomes fuel and is consumed while the other part is condensed
  • the oil becomes liquid phase and flows out of the setter plate, and the ash residue accumulates on the anti-burning interface to be discharged when the material is discharged.
  • Cooling separation During the process of anti-burning, turn on the circulating pump and use cold water to cool the oil and organic gas. The cold water passes through the air-cooled heat exchanger to cool down. The oil settles at the bottom of the cooling zone. The oil is discharged through the oil outlet regularly and drained. Excess waste water is discharged from the port.
  • the material when charging into the furnace, the material is fed from the lower part of the reaction furnace and discharged from the upper part of the reaction furnace, and the decompression interface is maintained in the middle section of the decompression furnace, and the oil is recovered by continuous or semi-continuous decompression.
  • the principle of the reverse combustion recovery of the present invention is to use the difference in the boiling points of different components of the oily substances in the oily pollutants, and only draw the high-boiling heavy oil, asphaltenes or other organic substances in the fuel-type substances as energy supply, and through radiation, convection,
  • the conduction method continues to perform continuous drying, pyrolysis, and spontaneous combustion reactions on the combustible components inside the oil pollutant particles and the surrounding similar materials, and finally not only the organic components in the oil pollutants are removed, but also the anti-burning airflow condensation method Recycled oil, such as gasoline, kerosene, diesel, fuel oil, etc. form a mixture.
  • the negative pressure referred to in the present invention refers to the vacuum in the negative pressure back-burning reaction furnace to maintain the negative pressure state, and the negative pressure range is -100Kpa ⁇ -0.1Kpa to achieve; the realization of negative pressure in the reaction furnace can be achieved
  • the oil and organic gas generated in the back-burning reactor will not overflow and cause safety hazards, and the oil and organic gas is fully trapped in the reactor to help back-burning The continued progress of the oil can further fully condense and recover the oil;
  • Under negative pressure the oily substance can volatilize the oil and organic gas at the boiling point below normal pressure, thereby saving the overall energy consumption and further conducive to Oil substances are desorbed or cracked from the surface of oil pollutants into the oil organic gas, thereby condensing and recovering more oil.
  • the so-called screening equipment is designed based on removing woven bags, colored strips, stones, tiles and other debris and large objects from oil contaminants; it can be a grid with a grid Plates, mechanical screening grabs, vibrating screens, etc.; when oily materials such as woven bags, colored strips, stones, tiles and other debris and large objects have been placed separately, there is no need for special screening
  • the equipment is separated; according to actual operation requirements, the sieve aperture can be designed to range between 10mm and 100mm. According to the material characteristics of the liquid, semi-solid, and solid three states after the oil pollutants are screened and separated, the surface dry hardening granulation system is adopted in stages.
  • the first step After the solid oil pollutants are crushed, they will gradually dry under the external heat supply condition, and will be further crushed and rubbed together with the semi-solid oil pollutants under the action of mechanical kneading. , Continue to dry and knead until the particles are hardened and cannot stick together;
  • Step 2 If the oil contaminant to be treated contains liquid, it will enter the secondary kneading and granulation process.
  • the liquid is driven by a pump and sprayed into the surface dry hardening granulation system;
  • the third step Finally, the shaped particles that meet the design requirements are temporarily stored in the storage warehouse for further processing.
  • the ash and slag after the anti-burning purification of this equipment can also be mixed into the first and second steps above to use its heat; if the oil pollutants contain more sulfur,
  • the precursors of acidic substances such as halogens can be mixed with alkaline substances such as quicklime, slaked lime, caustic soda, etc.; and the external heat can be generated by the waste heat generated by the system, or other electricity, Gas, heat pump, fuel oil, steam, waste heat, solar energy and other different forms are produced in single or combined form; in the surface dry hardening granulation process, if the water content of solid oil pollutants is less than 20%, external heat supply is not a necessary condition;
  • the surface dry hardening granulation system is implemented under negative pressure below -50Pa, and the generated gas can be sent to the negative pressure back-burning reactor by an exhaust fan for use.
  • the drying, pyrolysis, and spontaneous combustion described in this process are the successive steps that the oil pollutants go through before they are thoroughly purified. It includes two operation processes: the start of the heat treatment of the oil pollutants and the continuous operation. These two steps are self-contained. From top to bottom, the operation process is now described in detail:
  • the radiant heating element close to the oil pollutants is turned on first, and the input hot air is reheated by the radiant heating element before reaching the oil pollutants; by monitoring the temperature of the gas thermocouple, the power of the radiant heating element and the air input flow rate are adjusted , In order to meet the heat input requirements for the drying and pyrolysis of oil pollutants in the radiant heating element; at this time, the exhaust gas of the negative pressure fan is monitored at any time by the online detection system, and the detection components are T, VOCs, CO, CO 2.
  • thermocouple of the material 100 ⁇ 500mm away from the thermal radiation heating element when the temperature rise rate of the thermocouple of the material 100 ⁇ 500mm away from the thermal radiation heating element is monitored, the temperature rise rate reaches 5 ⁇ 50°C/min, and the concentration of VOCs and CO gas detected online are respectively When it reaches 50ppm or more than 1000ppm, the operation of the radiant heating element will be stopped, but the hot air is still continuously input; at this point, the system has completed the startup procedure, and the heating element can be turned off at this time.
  • the temperature of the material will still gradually rise to 600-2000°C.
  • the CO 2 and NO gas concentrations detected on-line reach 0.1% and 20 ppm respectively, the reaction has proceeded spontaneously.
  • the temperature change in the vertical direction assumes a "steep peak" shape, that is, each horizontal material layer will rise from low temperature to the highest temperature suddenly, and then the temperature will drop sharply.
  • the batch of oil pollutants can be processed before feeding, or an automatic feeding mechanism can be set up to feed continuously at intervals.
  • oily organic gas will be generated, partly from the volatilization and condensation of low-molecular oil and gas, and partly from the pyrolysis and volatilization of polymer oil.
  • the temperature is about 0 ⁇ 500°C; in order to achieve a good cooling effect, A circulating pump is used to pump the waste water condensed and collected at the bottom of the furnace to the heat exchanger.
  • the heat exchanger is preferably an air-cooled heat exchanger.
  • the waste water enters the cooling zone, and the waste water is preferably atomized into fine droplets by an atomizing nozzle , And directly and instantaneously contact with the oil-organic gas to cool, to change the water vapor and oil in the oil-organic gas from the gas phase to the liquid phase, thereby achieving preliminary separation.
  • the cooling zone can be directly connected under the anti-firing furnace, and designed into an integrated form for the setter plate.
  • the air-cooled heat exchanger can be equipped with a refrigeration dryer or other existing cold sources to provide a flowable cooling medium at -60 ⁇ 10°C.
  • the negative pressure anti-burning equipment of the present invention has a simple and compact structure, adopts negative pressure technology, has no leakage, is safe and reliable, and saves energy.
  • the negative pressure anti-burning equipment of the present invention is ingeniously designed and adopts anti-burning technology to make the combustion interface from top to bottom, consistent with the flow direction of the oily substances in the gas and liquid phases.
  • the gas and liquid Due to the action of gravity, the oily substances in the same phase volatilize upwards, and then fall back to the combustion interface. Most of them are burned clean, and rarely can be recycled, resulting in a waste of resources.
  • the oil recovery process of the present invention can achieve a total oil removal rate of more than 99% for oil pollutants, no secondary pollution, simple operation and maintenance, operating costs more than 50% lower than traditional incineration and pyrolysis, and the recovery rate is lower High, oil organic matter has been recovered as much as possible, and the recovery rate has reached more than 60%, obtaining good social, economic and environmental benefits.
  • 1 is the negative pressure back burning reaction furnace body
  • 2 is the air inlet
  • 3 is the heating element
  • 4 is the reflector
  • 5 is the air tube
  • 6 is the setter plate
  • 7 is the nozzle
  • 8 is the air-cooled heat exchanger
  • 9 It is a hair dryer
  • 10 is a circulating pump
  • 11 is a circulating pipe
  • 12 is a negative pressure suction port
  • 13 is an oil outlet
  • 14 is a drain
  • 15 is an oil contaminant
  • a negative pressure backburning equipment for oil pollutants is composed of a negative pressure backburning reactor, a negative pressure fan system, a circulating pump 10 and its pipeline system, and a cooling system.
  • the negative pressure backburning reactor includes a furnace body 1, The air inlet 2, the heating element 3, the setter plate 6, the air inlet 2 is set on the top of the furnace body 1, the infrared heat radiation heating element 3 is installed in the upper part of the furnace, the setter plate 6 has openings, and the setter plate 6 is installed In the lower part of the furnace body 1, there is a filter screen on the setter plate 6 with 100 meshes.
  • the distance between the upper part of the infrared heat radiation heating element 3 and the upper part of the infrared heat radiation heating element 3 is 400 mm, and a reflector 4 is installed, which faces the infrared radiation heating element 3
  • the interior is coated with high-temperature reflective paint, and a number of vents with a diameter of 45mm are provided.
  • the cooling and cooling system includes a cooling zone, a circulating pump 10, a circulating pipe 11 and an air-cooled heat exchanger 8.
  • the cooling zone is connected to the bottom of the negative pressure back-burning reactor.
  • the side wall of the cooling zone has a negative pressure suction port 12, an oil discharge port 13 and a drain port 14 from top to bottom.
  • the bottom of the drain port 14 is connected to the circulating pump 10 through the circulating pipe 11, and then passes through the circulating pipe 11 and the air-cooled heat exchanger 8 is connected, the air-cooled heat exchanger 8 is composed of finned heat exchange tubes and a blower 9.
  • the liquid inlet of the air-cooled heat exchanger 8 is connected with the circulating pump 10, and the outlet extends into the cooling zone of the cooling system.
  • the cooling zone is installed
  • the liquid distribution pipe is connected with the liquid outlet of the air-cooled heat exchanger 8. There are nozzles on the liquid distribution pipe and a number of nozzles 7 are arranged.
  • the inlet of the blower 9 is connected with air, and the outlet is connected with the air inlet 2 of the furnace body 1.
  • the blower 9 is equipped with a motor vector inverter, and the negative pressure suction port 12 is connected with a roots blower controlled by the motor vector inverter.
  • the size of the main machine of this kind of negative pressure back-burning equipment is 2000mm in diameter and 2500mm in height, and the furnace body 1 is provided with a thermal insulation layer.
  • Eighty monitoring temperature detectors are evenly distributed on the same longitudinal section and different vertical heights in the furnace, and real-time data are transmitted to the system control platform multi-channel data acquisition device.
  • the temperature monitoring generates a temperature curve on the computer display and combines with flow counting According to this value, the negative pressure fan inverter and or regulating valve are adjusted; pressure detectors are set at the upper and lower airflow positions in the furnace, which are interlocked with the negative pressure fan inverter; the circulation pump 10 outlet pipe is set with a flow meter and a pressure detector to pass flow , Pressure monitoring to determine whether the circulating pump 10 is operating normally; the air-cooled heat exchanger 8 is equipped with two blowers 9, each blower 9 is equipped with a motor vector inverter, and the variable frequency motor is connected with the air-cooled heat exchanger 8 on the waste water outlet pipe The temperature detector is interlocked and controlled; in order to achieve the best effect of oil recovery, a micro air pump sampling point is set on the air outlet pipe of the negative pressure fan, and the organic gas is pumped to the online detector
  • the online detector detects at least one or more of the following The above data: CO, CO 2 , VOCs, NOx, and transmit the data to the system control platform, generate curves and data analysis on the computer monitor, of course, in order to run the data to detect the effectiveness, it must be supplemented by the same parameter handheld detector interval Column row detection.
  • the oily pollutants used in the embodiments of the present disclosure come from oily soil (solid) produced during the production process of an oil refinery, oily sewage, air-floating sludge (semi-solid), and oily debris (such as cloth strips, grass, plastic, etc.); oily soil; That is, the contaminated high-concentration oil-bearing clay, solid, with a water content of 22.5%, containing 34147mg/kg of total petroleum hydrocarbons (C 6 -C 9 2365mg/kg, C 10 -C 14 5270mg/kg, C 15 -C 28 18200mg/kg, C 29 -C 36 8312mg/kg); slick sludge, semi-solid, moisture content 89.2%, containing total petroleum hydrocarbons 17058mg/kg (C 6 -C 9 658mg/kg, C 10 -C 14 24200mg /kg, C 15 -C 28 93600mg/kg, C 29 -C 36 51600
  • total petroleum hydrocarbons are substances detected by different detection methods based on the number of carbon atoms, such as total petroleum hydrocarbons (C 6 -C 9 ): American standard pretreatment purge and trap method/detection method gas phase Chromatography-Mass Spectrometry USEPA8260D-2017, Total Petroleum Hydrocarbons (C 10 -C 36 ): American Standard Pretreatment Solvent Extraction/Detection Method Gas Chromatography USEPA8015C-2007.
  • the surface is hardened by natural drying to achieve the purpose of material granulation and granulation.
  • the oil pollutants after granulation are first loaded on the setter plate 6 of the negative pressure back-burning reactor, and they can be mixed in any ratio; the surface of the oil pollutant storage height should be compatible with the radiation generated by electricity
  • the heating element maintains a distance between 50mm and 100mm.
  • the designed timing time manually record the temperature of the monitoring sensor at different locations, and collect the gas for CO component detection; the data obtained afterwards generate a curve, observe the curve change trend, and determine the heater ignition off time and blast flow adjustment time and online detection
  • the VOCs and CO gas concentrations of the negative pressure fan exhaust reach 50ppm and 1000ppm respectively
  • the temperature of the upper layer mixture rises to 400°C
  • the ignition is completed.
  • the material temperature rises to 1000°C the CO 2 and NO gas concentrations detected on-line will reach 0.2% and 25 ppm respectively, and enter the spontaneous anti-burning stage. Turn off the heating element and keep the air sucked through the mixture from top to bottom for anti-burning.
  • the oil in the gas phase is continuously condensed into the liquid phase by the circulating cooling water at the bottom of the negative pressure anti-burning furnace.
  • Step (3) The oil and water produced at the bottom of the reactor are separated from the oil and water and discharged separately by the drain valve and the oil drain valve.
  • the oil discharged from the oil drain valve enters the recovery tank; the sewage discharged from the drain valve enters the sewage treatment system Treat and discharge water up to the standard.
  • the discharged residue After treatment, the discharged residue has a moisture content of 0.5% and contains total petroleum hydrocarbons ND (ND is not detected).
  • Recovered oil water content 0.24%, containing total petroleum hydrocarbons 86364000mg/kg (C 6 -C 9 192000mg/kg, C 10 -C 14 66500000mg/kg, C 15 -C 28 272000mg/kg, C 29 -C 36 19400000mg/kg), the oil recovery rate was 76%.

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un dispositif de combustion inverse à pression négative destiné à des polluants huileux, et un procédé de récupération d'huile. Le dispositif de combustion inverse à pression négative comprend un four de réaction à combustion inverse à pression négative, un système de ventilation à pression négative, une pompe de circulation (10) et un système de conduites de ladite pompe, et un système de refroidissement. Le four de réaction à combustion inverse à pression négative comprend un corps de four (1), une entrée d'air (2), un élément chauffant par rayonnement thermique infrarouge (3) et une plaque de support de combustion (6) ; l'entrée d'air (2) est agencée au niveau de la partie supérieure du corps de four (1) ; l'élément chauffant par rayonnement thermique infrarouge (3) est monté sur la partie supérieure dans le corps de four ; la plaque de support de combustion (6) est munie d'un trou ; la plaque de support de combustion (6) est montée sur la partie inférieure dans le corps de four (1) ; un élément réfléchissant (4) est monté à une distance de 400 mm de la partie supérieure de l'élément chauffant par rayonnement thermique infrarouge (3) ; le système de refroidissement comprend une zone de refroidissement, la pompe de circulation (10), un tuyau de circulation (11) et un échangeur de chaleur refroidi par air (8) ; la zone de refroidissement est reliée à la partie inférieure du four de réaction à combustion inverse à pression négative ; une paroi latérale de la zone de refroidissement est munie d'un orifice d'extraction à pression négative (12), d'un orifice d'évacuation d'huile (13) et d'un orifice d'évacuation d'eau (14), de haut en bas ; et la partie inférieure de l'orifice d'évacuation d'eau (14) est reliée à la pompe de circulation (10) au moyen du tuyau de circulation (11), puis reliée à l'échangeur de chaleur refroidi par air (8) au moyen du tuyau de circulation (11). Le procédé de récupération d'huile réalise une récupération d'huile au moyen des étapes de tri et de granulation, de remplissage d'un corps de four de réaction de combustion inverse à pression négative (1), de démarrage de la combustion inverse spontanée après l'allumage, et enfin de refroidissement et de séparation. L'utilisation du dispositif et du procédé permet d'atteindre un taux de récupération d'huile égal ou supérieur à 60 %.
PCT/CN2020/086256 2019-04-11 2020-04-23 Dispositif de combustion inverse à pression négative pour polluants huileux, et procédé de récupération d'huile WO2020207503A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910290347.7A CN109990301B (zh) 2019-04-11 2019-04-11 一种油类污染物负压反烧设备及回收油的方法
CN201910290347.7 2019-04-11

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