Multi-stage heat treatment repair equipment and method for oily sludge

Abstract

The invention relates to multi-stage heat treatment repair equipment and method for oily sludge, and belongs to the technical field of oily sludge repair. The repairing process comprises the steps of screening treatment, compaction dehydration, crushing treatment, precipitation layering, multi-stage heat treatment, gas condensation, drying treatment, tail gas combustion, spraying dust removal and backfilling. The equipment comprises a solid treatment system, a precipitation layering system, a first-stage heat treatment system, a second-stage heat treatment system, a gas condensation system, a tail gas treatment system and a backfilling system. In the heat treatment process of the oily sludge, solid pollutants and liquid pollutants are treated separately, and a multi-stage heat treatment method is adopted according to different temperatures required by volatilization of different substances in the oily sludge, so that the heat energy utilization rate and the repair efficiency are improved. And meanwhile, the desorbed gas product is combusted and then used for the heat treatment process, so that recycling of the desorbed product is realized. The device is reasonable in structure, easy to operate, high in practicability and wide in utilization prospect.

Description

Technical Field

[0001] The invention relates to the technical field of soil remediation, and mainly to thermal treatment remediation equipment and a method for oily sludge. Background Art

[0002] During the oil extraction process, oil spill accidents occur due to leakage of oil wells, damage of oil pipelines and corrosion of oil storage facilities; substances in oil change the physical and chemical properties of the soil, making the soil highly toxic, causing serious environmental pollution and certain environmental geotechnical engineering problems; part of the pollutants accumulate in the shallow soil layer, and part of the oil pollutants migrate in the soil to the deep underground soil, so the accumulation of a large amount of pollutants has become a serious environmental problem; oil is a volatile hydrocarbon, and its volatility is the property of oil surface molecules to diffuse into the air, such as hydrogen sulfide, ethane, propane, some butane and a small amount of pentane. The volatilization of these substances causes secondary harm to surface water and groundwater resources, thereby affecting the food chain and endangering human safety.

[0003] At present, landfill, incineration, chemical flushing, biological treatment and thermal desorption are commonly used for oily sludge remediation. Physical methods such as landfill and incineration are relatively simple and have a short operation cycle, but they are prone to secondary pollution during treatment, and incineration has a greater impact on the environment and is expensive. Chemical flushing can effectively remove pollution, such as EDTA, NTA, DTPA, citric acid, malic acid, etc. These reagents form new complexes with heavy metals through their own stronger complexation and are separated from the soil, but the residual chemicals are also a kind of pollution to the soil itself. Biological treatment is an effective and environmentally friendly removal method, but this method is often limited by the environment, such as temperature, nutrients, moisture and pollutant concentration, and the treatment effect often does not meet expectations. At present, soil thermal desorption is an internationally recognized treatment method. In the process of remediating oily sludge, it can be used for oily sludge in various situations. It has received widespread attention due to its direct, efficient and economical characteristics. The following are related inventions of thermal desorption treatment.

[0004] The invention with publication number CN104496136A discloses an indirect heating thermal desorption treatment device and method for oil-containing solid waste, which can effectively decompose oil-containing solid waste; the invention with publication number CN104785515A discloses a two-stage auger indirect thermal desorption device, which belongs to a contaminated soil remediation device, and the device uses waste heat to pre-treat the contaminated soil; the invention with publication number CN105080958A discloses an organic contaminated soil classification thermal desorption remediation system and process, which uses a high-temperature thermal desorption kiln system and a low-temperature thermal desorber system to respectively treat organic contaminated soil of different degrees of contamination; the invention with publication number CN204769861U discloses a microwave soil thermal desorption device, which can perform microwave heating on high-water content soil and sticky soil to perform temperature-raising thermal desorption, and at the same time extract the desorbed gas through an extraction tube to complete the soil remediation.

[0005] The above devices usually treat oily sludge directly without considering the different substances in the oily sludge, because the oily sludge generally contains water. When the temperature is between 100°C and 300°C, the main desorption products are water, saturated hydrocarbons and some aromatic hydrocarbons, and the process of desorption of water will waste a lot of heat energy; when the temperature is between 300°C and 500°C, the main desorption products are aromatic hydrocarbons; when the temperature is higher than 500°C, the main desorption products are colloids and asphaltene; when using thermal desorption to treat oily sludge, because the different volatilization temperatures of water and petroleum are not taken into account, the water in the oily sludge often evaporates first, resulting in a large amount of heat energy not being used to desorb petroleum hydrocarbons, wasting external energy supply; at the same time, the above devices do not reuse the desorption products and waste heat, wasting a lot of heat energy; therefore, the thermal desorption method for treating oily sludge mainly has the following shortcomings: low thermal energy utilization rate, low desorption efficiency, and low exhaust heat utilization rate. Summary of the invention

[0006] In response to the problems of heat energy being wasted by water in the sludge and heat energy loss in the tail gas in the above-mentioned patents, the present invention provides a multi-stage thermal treatment and repair equipment and method for oily sludge, which adopts a multi-stage thermal treatment method, fully utilizes the thermal energy of the tail gas and separately treats the water in the oily sludge, thereby improving the thermal energy utilization rate and desorption efficiency; and the desorption product is reused in the thermal treatment process, thereby realizing the reuse of the desorption product; the present invention solves the problems of low desorption efficiency, low energy utilization rate and high treatment cost in the thermal treatment process; the present invention solves the above-mentioned technical problems with the following technical solutions.

[0007] A multi-stage heat treatment and repair equipment for oily sludge, the process includes screening treatment, compaction dehydration, sedimentation and stratification, multi-stage heat treatment, gas condensation, drying treatment, tail gas combustion, spray dust removal, backfilling and other operations.

[0008] Furthermore, the screening treatment is to screen the oilfield sludge, in which larger stones, branches and other debris will be removed to reduce the impact on subsequent thermal desorption; further, the compaction dehydration is to put the oily sludge into a container and apply pressure from above. This process can separate some water and oil in the soil; the sedimentation stratification is to put the compacted water and oil mixed liquid into a sedimentation tank, stir to accelerate the separation of oil, water and particles, and extract the upper layer of liquid for evaporation and condensation after standing and stratifying; further, the multi-stage thermal treatment is divided into the first stage thermal After the compaction and dehydration, the oily sludge is crushed and then enters the first solid desorption chamber. A spiral auger is placed in the chamber to fully stir and crush the oily sludge again. The temperature in the first solid desorption chamber is above 150°C, which can remove moisture, saturated hydrocarbons and some aromatic hydrocarbons in the soil. At the same time, the upper liquid after sedimentation and stratification is extracted into the liquid evaporation chamber. There is a heater at the bottom of the liquid evaporation chamber to make the liquid in the chamber reach above 300°C, which can evaporate the moisture and petroleum in the upper liquid into a mixed gas and enter the condensation chamber; then The oily sludge is then sent to the second-stage solid desorption bin through the feed bin. The temperature in the second-stage solid desorption bin is about 600°C or above, which can basically remove petroleum hydrocarbons, colloids and asphaltene in the soil; further, the gas is condensed, and the gas is first passed through a condenser. By utilizing the difference in boiling points between oil and water, a saturated aqueous solution of sodium chloride with a boiling point of 109°C is used as the condensate. After the petroleum hydrocarbon gas is condensed, it enters the spherical collection tube along the condenser and then enters the collection bin; further, the drying treatment dries the uncondensed gas so that the uncondensed gas hydrocarbons enter the tubular combustion chamber; further, the exhaust gas combustion is to fully burn the dried gas hydrocarbons, and the high-temperature mixed gas generated by the combustion is heated to the liquid evaporation bin by a spiral gas pipeline, and then the gas is directly discharged, and the water vapor in the mixed gas is condensed into a water storage bottle and then into a spray pipe, so as to realize the recycling of resources and meet the green emission standards at the same time; further, the spray dust removal and backfilling is to spray the soil after thermal desorption treatment with water to cool and remove dust, and then backfill the soil into the contaminated area.

[0009] Compared with the existing equipment and methods, the present invention has the following beneficial effects: 1. The present invention aims at wasting a large amount of heat energy during the heat treatment process of the water in the oily sludge. Before the oily sludge is heat-treated, the solid pollutants and liquid pollutants in the oily sludge are separated by compaction and heat-treated separately. This can avoid a large amount of heat energy being consumed by the water during the heat treatment of the solid pollutants. At the same time, the liquid pollutants can be directly treated, thereby improving the desorption efficiency and the utilization rate of heat energy.

[0010] 2. The present invention uses multi-stage thermal desorption at different temperatures to repair the water and petroleum hydrocarbons in the oily sludge according to the different temperatures required for the volatilization of different substances in the oily sludge. This can avoid the failure of substances with higher boiling points in the oily sludge to volatilize at low temperatures and the waste of a large amount of heat energy for substances with lower boiling points at high temperatures, thereby greatly improving the utilization rate of heat energy.

[0011] 3. In view of the low thermal energy utilization rate of the high-temperature exhaust gas generated during the thermal desorption process, the present invention burns the high-temperature exhaust gas generated by desorption to become a high-temperature mixed gas that can be directly discharged. At the same time, the high temperature of the gas is used to heat treat the liquid pollutants, thereby realizing the reuse of the desorption products and improving the thermal energy utilization rate of the exhaust gas.

[0012] 4. In the present invention, during the heat treatment of liquid pollutants by the high-temperature mixed gas, water vapor in the high-temperature mixed gas will condense to form liquid water and be collected for use in the spray dust removal process, thereby reducing external energy supply and saving energy resources.

[0013] 5. In the present invention, the oily sludge can be directly backfilled into the soil excavation area after multi-stage heat treatment, thereby reducing soil loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a multi-stage thermal treatment remediation flow chart for oily sludge; Figure 2 This is a schematic diagram of the multi-stage thermal treatment and remediation equipment for oily sludge; Figure 3 This is a schematic diagram of the second-stage solid desorption chamber structure.

[0016] Icons: 1. Pressurized bin; 2. Screen; 3. Snap fastener; 4. Pressurized rod; 5. Feed pipe; 6. Crushing bin; 7. Roller crusher; 8. Motor; 9. Seamless steel pipe; 10. Valve; 11. Sedimentation tank; 12. Output pipe; 13. Stirring device; 14. Elastic telescopic tube; 15. Suction head; 16. Water pump; 17. Exhaust pipe; 18. Liquid evaporation bin; 19. Spiral gas pipeline; 20. Heater 1; 21. Insulation pipe; 22. First-stage solid desorption bin; 23. Digital display; 24. Infrared temperature sensor; 25. Dust concentration sensor; 26. Spiral auger; 2601. Intermediate bearing; 2602. Rotating blade; 2603, machine slot; 2604, temperature alarm light; 2605, dust concentration alarm light; 27, bracket; 28, water storage bottle; 29, spray pipe; 30, sprayer; 31, conveyor belt; 32, feed bin; 33, second-stage solid desorption bin; 34, discharge pipe; 35, PVC hose; 36, condensation bin; 37, collection bin; 38, condensation pipe; 39, spherical collection pipe; 40, heater 2; 41, spherical drying tube; 42, tubular combustion chamber; 43, nozzle; 44, air inlet; 45, flame tube; 46, nitrogen protection device; 47, insulation layer; 48, collection pipe; 49, outer tube; 50, three-leaf stirring blade. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] The present invention provides a multi-stage heat treatment and repair equipment for oily sludge, wherein the equipment comprises a solid treatment system, a sedimentation and stratification system, a first-stage heat treatment system, a second-stage heat treatment system, a gas condensation system, a tail gas treatment system, and a backfill system.

[0019] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0020] The solid handling system is used for screening, compaction dehydration and crushing, and mainly includes a pressurized bin 1, a screen 2, a snap fastener 3, a pressurized rod 4, a feed pipe 5, a crushing bin 6 and a double-roll crusher 7; wherein the pressurized bin 1 is a hollow cylindrical tube, the bottom of which can be opened to release the soil; the screen 2 is installed inside the pressurized bin 1 through the snap fastener 3, and the screen surface is composed of many round holes, which can remove leaves and large rocks in the soil; the soil in the pressurized bin 1 is compacted by the pressurized rod 4, and the liquid pollutants enter the sedimentation tank 11 through the seamless steel pipe 9 after compaction, and one end of the seamless steel pipe 9 is installed on the left side of the bottom of the pressurized bin 1; the feed pipe 5 is a hollow frustum, and the upper and lower ends are respectively connected to the pressurized bin 1 and the crushing bin 6; the crushing bin 6 is provided with a double-roll crusher 7, which can preliminarily crush the compacted and dehydrated soil, and the bottom of the crushing bin 6 is connected to the top of the first-stage solid desorption bin 22 through the feed pipe 5.

[0021] The sedimentation and stratification system is used for the sedimentation and stratification process, and mainly includes a motor 8, a seamless steel pipe 9, a valve 10, a sedimentation tank 11, an output pipe 12, a stirring device 13, an elastic telescopic tube 14, a suction head 15, a water pump 16, and a collecting pipe 48; wherein the sedimentation tank 11 is a hollow cylindrical tube, and a seamless steel pipe 9 is connected to the left side of the top and extends into the sedimentation tank 11, and the seamless steel pipe 9 can deliver the polluted liquid into the sedimentation tank 11, and a stirring device 13 driven by the motor 8 is provided on the inner center line, wherein the three-leaf stirring blade 50 can fully stir the polluted liquid and accelerate the separation of oil, water and particles, and a suction head 15 is installed at the lower end of the elastic telescopic tube 14 on the right side of the top, and the upper layer of liquid after stratification can be sucked into the liquid evaporation bin 18 along the collecting pipe 48 through the water pump 16, and an output pipe 12 is provided at the bottom of the left side of the sedimentation tank 11, and the uncontaminated liquid and sediment in the lower layer can be discharged.

[0022] The first-stage heat treatment system is mainly used for drying moisture, saturated hydrocarbons and some aromatic hydrocarbons, and includes an exhaust pipe 17, a liquid evaporation bin 18, a spiral gas pipeline 19, a heater 20, an insulation pipe 21, a first-stage solid desorption bin 22, a digital display 23, an infrared temperature sensor 24, a dust concentration sensor 25, a spiral auger 26, a bracket 27, a water storage bottle 28, and an insulation layer 47; wherein the liquid evaporation bin 18 is a hollow cylindrical tube, which is used for evaporating, compacting and dehydrating liquid pollutants, and an insulation layer 47 is arranged around the bin, and the insulation layer 47 is made of insulation cotton material to reduce heat loss, an insulation pipe 21 is arranged at the top center and connected to the condensation bin 36, and an exhaust pipe 17 is arranged on the left side and connected to the spiral gas pipeline 19, and the spiral gas pipeline 19 is spirally arranged on the inner surface, and the high-temperature gas in the pipe can be used to heat the liquid in the liquid evaporation bin 18, and a heater 20 is arranged at the bottom center to heat and evaporate the liquid pollutants; a water storage bottle 28 is arranged on the right side of the bottom of the spiral gas pipeline 19 and is connected to the bottom of the spiral gas pipeline 19, for The water condensed from the high-temperature mixed gas is stored and connected to the spray pipe 29 through a seamless steel pipe 9. The right side of the bottom of the spiral gas pipeline 19 is connected to the tubular combustion chamber 42 through an insulation pipe 21; the insulation pipe 21 adopts a polyurethane glass wool insulation pipe 21 to reduce heat loss; the first-stage solid desorption bin 22 is a horizontal hollow cylindrical tube, and an insulation layer 47 is arranged around the bin, which is fixed on the bracket 27 and is used to heat the moisture, saturated hydrocarbons and part of the aromatic hydrocarbons in the desorbed soil. A spiral auger 26 is arranged on the inner center line to fully crush the soil and accelerate the desorption of petroleum hydrocarbons in the soil. The left and right sides are sealed, and an exhaust pipe 17 is arranged on the left side. Infrared temperature sensors 24 and dust concentration sensors 25 are respectively arranged on both sides of the top of the first-stage solid desorption bin 22, and are connected to the digital display 23 outside the bin to monitor the temperature and dust concentration in the bin. If the dangerous threshold is reached, an alarm will be issued. The top side is connected to the condensation bin 36 through the insulation pipe 21, the bottom center is connected to the feed bin 32, and the bottom side is connected to the nitrogen protection device 46 through a PVC hose 35.

[0023] The second-stage heat treatment system is used for desorbing petroleum hydrocarbons, colloids and asphaltene, and includes an insulation pipe 21, a digital display 23, an infrared temperature sensor 24, a dust concentration sensor 25, a spiral auger 26, a second-stage solid desorption bin 33, a discharge pipe 34, a PVC hose 35, a nitrogen protection device 46, and an insulation layer 47; wherein the second-stage solid desorption bin 33 is a horizontal hollow cylindrical cylinder fixed on a bracket 27, and is used for heating and desorbing petroleum hydrocarbons in the soil. An insulation layer 47 is arranged around the bin, and the insulation layer 47 is made of insulation cotton material to reduce heat loss, and the left and right sides are sealed, and an exhaust pipe 17 is arranged on the left side. A spiral auger 26 is arranged on the inner center line to fully crush the soil and accelerate the desorption of aromatic hydrocarbons, colloids and asphaltene in the soil. An infrared temperature sensor 24 and a dust concentration sensor 25 are respectively provided on both sides of the top of the secondary solid desorption bin 33, and are connected to the digital display meter 23 outside the bin, so as to monitor the temperature and dust concentration in the bin. If the dangerous threshold is reached, an alarm will be issued. One side of the top is connected to the condensation bin 36 through the insulation pipe 21, and the top center is connected to the first-stage solid desorption bin 22 through the feed bin 32, so that the oily sludge in the first-stage solid desorption bin 22 can be sent to the second-stage solid desorption bin 33. The bottom center is connected to the discharge pipe 34, and one side of the bottom is connected to the nitrogen protection device 46 through the PVC hose 35.

[0024] The gas condensation system is used for the gas condensation process, and is mainly composed of a condensation bin 36, a collection bin 37, a condensation tube 38, a spherical collection tube 39, a heater 40, an insulation layer 47, and a collection tube 48; wherein the condensation bin 36 is a hollow rectangular parallelepiped, and an insulation layer 47 is arranged around the bin, and the insulation layer 47 is made of insulation cotton material to reduce heat loss, and a hollow rectangular parallelepiped collection bin 37 is arranged on the right side of the bottom, and a collection tube 48 is arranged on the top of the collection bin 37, which extends to the inside of the collection bin 37, and the upper end of the collection tube 48 is connected to the bottom of the spherical collection tube 39, and the petroleum hydrocarbon gas of the mixed gas is stored in the spherical collection tube 39 after condensation, and the condensed petroleum enters the collection bin 37 through the collection tube 48 controlled by the valve 10, and the right side of the condensation bin 36 is provided. There is a heater 40 on the side, which can heat the condensate in the bin. By utilizing the difference in boiling points between petroleum and water, a saturated aqueous solution of sodium chloride with a boiling point of 109°C is selected as the condensate. After the petroleum hydrocarbon gas is condensed, it enters the spherical collecting tube 39 along the condenser 38. The spherical collecting tube 39 can also prevent the gas from entering the collecting bin 37. Water vapor and uncondensed gaseous hydrocarbons enter the spherical drying tube 41 through the seamless steel pipe 9. The condenser 38 is U-shapedly arranged inside the condensation bin 36, with the air inlet located on the left side of the bottom of the condensation bin 36 and the air outlet located on the top right side. The U-shaped section at the lower end of the condenser 38 is connected to the spherical collecting tube 39, and the condensed petroleum is stored in the spherical collecting tube 39. Finally, the valve 10 is opened and enters the collecting bin 37 through the collecting tube 48.

[0025] The exhaust gas treatment system is used for drying treatment and exhaust gas combustion process, and is mainly composed of seamless steel pipe 9, spherical drying tube 41, tubular combustion chamber 42, nozzle 43, air inlet 44, flame tube 45, and outer tube 49; wherein, molecular sieve desiccant is filled in spherical drying tube 41 to remove moisture in uncondensed gas, and the left and right ends are respectively connected to tubular combustion chamber 42 and condenser 38 through seamless steel pipe 9, and the dried gas enters the outer tube 49 of tubular combustion chamber 42, enters the flame tube 45 through air inlet 44, and is completely burned after mixing with the fuel sprayed from nozzle 43 to produce high-temperature carbon dioxide and water vapor, which enters the spiral gas pipeline 19 through the bottom insulation pipe 21, and then the high-temperature carbon dioxide and water vapor use the high temperature of spiral gas pipeline 19 to heat the liquid pollutants in liquid evaporation bin 18, and the water vapor condenses into the water storage bottle 28, and the carbon dioxide is discharged through the exhaust pipe 17.

[0026] The backfilling system is used for spraying dust removal and backfilling, and mainly includes a spray pipe 29, a sprayer 30, a conveyor belt 31, and a discharge pipe 34; wherein, one end of the conveyor belt 31 is located below the discharge pipe 34, and the soil material can be conveyed to the backfilling area; the spray pipe 29 is located above the conveyor belt 31, and one end is connected to the water storage bottle 28 through a seamless steel pipe 9, and the water in the water storage bottle 28 can be used for spraying, dust removal, and cooling of the soil material; the sprayers 30 are equidistantly arranged directly below the spray pipe 29, and the soil material on the conveyor belt 31 can be sprayed, dust removed, and cooled; the discharge pipe 34 is located at the bottom of the second-stage solid desorption bin 33, and the repaired soil material in the second-stage solid desorption bin 33 can be transferred to the conveyor belt 31.

[0027] An operating method of a multi-stage thermal treatment and repair device for oily sludge, the method comprising the following steps: S1: Put the oily sludge into the screen 2, remove the leaves, large rocks and other debris in the soil by vibrating the screen 2, and the screened oily sludge enters the pressurized bin 1 to preheat the first-stage solid desorption bin 22 to a temperature of more than 150°C; S2: Mechanically push the pressure rod 4 to compact and dehydrate the oily sludge after screening. The liquid pollutants enter the sedimentation tank 11 through the seamless steel pipe 9, turn on the stirring device 13, and accelerate the separation of oil, water and particles through sufficient stirring. Then turn off the stirring device 13, let it stand for stratification, and start the roller crusher 7 at the same time. Turn on the bottom switch of the pressure bin 1 to initially crush the compacted soil and then enter the first-stage solid desorption bin 22. Start the spiral auger 26 to fully crush the initially crushed soil, accelerate the evaporation of water and the desorption of saturated hydrocarbons, and turn on the heater 2 40 to preheat the condensate in the condensation bin 36 to 109°C; S3: The upper layer of liquid in the sedimentation tank 11 is sucked into the liquid evaporation chamber 18 by the water pump 16 and the suction head 15, the heater 20 is turned on, the valve 10 of the insulation pipe 21 is opened at about 300°C, so that the mixed gas enters the condenser 38, the valve 10 of the insulation pipe 21 of the first-stage solid desorption chamber 22 is opened, so that the mixed gas enters the condenser 38, and the second-stage solid desorption chamber 33 is preheated to 600°C; S4: Open the valve 10 between the first-stage solid desorption bin 22 and the second-stage solid desorption bin 33, so that the soil material enters the second-stage solid desorption bin 33 through the feed bin 32, start the spiral auger 26 to accelerate the desorption of aromatic hydrocarbons, colloids and asphaltene in the soil, and the petroleum hydrocarbons in the mixed gas enter the spherical collection pipe 39 along the condenser pipe 38 after condensation, and the uncondensed gas enters the spherical drying pipe 41 along the seamless steel pipe 9; S5: Open the valve 10 of the insulation pipe 21 of the second-stage solid desorption chamber 33, so that the hydrocarbon gas enters the condenser 38, and the uncondensed gas entering the spherical drying tube 41 enters the tubular combustion chamber 42 for full combustion after drying. The high-temperature carbon dioxide and water vapor generated by the combustion enter the spiral gas pipeline 19 along the bottom insulation pipe 21 to heat and evaporate the liquid pollutants. After part of the water vapor is condensed, it enters the water storage bottle 28 along the spiral gas pipeline 19, and the discharge pipe 34 of the second-stage solid desorption chamber 33 is opened; S6: The repaired high-temperature soil material is sent to the conveyor belt 31 along the discharge pipe 34, the valve 10 of the spray pipe 29 above the conveyor belt 31 is opened, the high-temperature soil material is sprayed, dusted and cooled, and the valve 10 of the output pipe 12 at the bottom of the sedimentation tank 11 is opened to discharge the lower layer of liquid and sediment; S7: Open the valve 10 of the collecting pipe 48 of the condensation bin 36 to collect the oil in the spherical collecting pipe 39 and store it in the collecting bin 37, which can effectively prevent the mixed gas from entering the collecting bin 37.

[0028] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A multi-stage thermal treatment and repair equipment for oily sludge, characterized in that: The equipment includes a solid processing system, a precipitation and stratification system, a first-stage heat treatment system, a second-stage heat treatment system, a gas condensation system, an exhaust gas processing system and a backfilling system; the working process of the equipment includes screening processing, compaction and dehydration, crushing processing, precipitation and stratification, multi-stage heat treatment, gas condensation, drying processing, exhaust gas combustion, spray dust removal, and backfilling process.

2. The multi-stage heat treatment and repair equipment for oily sludge according to claim 1 is characterized in that: The screening, compaction dehydration and crushing processes are completed in a solid processing system; the solid processing system comprises a pressurizing bin (1), a screen (2), a snap fastener (3), a pressurizing rod (4), a feed pipe (5), a crushing bin (6) and a double-roll crusher (7); the pressurizing bin (1) is a hollow cylindrical tube, the bottom of which can be opened, and the pressurizing rod (4) is installed at the center of the pressurizing bin (1); the screen (2) is fixed inside the pressurizing bin (1) by means of the snap fastener (3); the crushing bin (6) contains a double-roll crusher (7), the upper and lower parts of which are respectively connected to the bottom of the pressurizing bin (1) and the top of the first-stage solid desorption bin (22) by means of a feed pipe (5); the feed pipe (5) is in the shape of a hollow truncated cone, the upper and lower ends of which can be opened.

3. The multi-stage heat treatment and repair equipment for oily sludge according to claim 1 is characterized in that: The sedimentation and stratification process is completed in a sedimentation and stratification system; the sedimentation and stratification system comprises a motor (8), a seamless steel pipe (9), a sedimentation tank (11), an output pipe (12), a stirring device (13), an elastic telescopic pipe (14), a water pump (16), and a collecting pipe (48); the sedimentation tank (11) is a hollow cylindrical tube, and an output pipe (12) is provided at the bottom; the stirring device (13) is driven by the motor (8), is located on the center line of the sedimentation tank (11), and is provided with a three-blade stirring blade (50); one end of the seamless steel pipe (9) is connected to the bottom of the pressurizing chamber (1), and the other end extends to the top of one side of the sedimentation tank (11); one end of the collecting pipe is located inside the sedimentation tank (11) and connected to the elastic telescopic pipe (14), and the other end is connected to the liquid evaporation chamber (18) through the water pump (16); the lower part of the elastic telescopic pipe (14) is connected to a suction head (15) with a filter screen; the output pipe (12) is located at the bottom of the side of the sedimentation tank (11).

4. The multi-stage heat treatment and repair equipment for oily sludge according to claim 1 is characterized in that: The multi-stage heat treatment process is divided into a first-stage heat treatment and a second-stage heat treatment, which are completed in the first-stage heat treatment system and the second-stage heat treatment system respectively.

5. The multi-stage heat treatment and repair equipment for oily sludge according to claim 4 is characterized in that: The first-stage heat treatment system comprises an exhaust pipe (17), a liquid evaporation chamber (18), a spiral gas pipeline (19), a heater (20), an insulation pipe (21), a first-stage solid desorption chamber (22), a digital display (23), an infrared temperature sensor (24), a dust concentration sensor (25), a spiral auger (26), a bracket (27), a water storage bottle (28), and a PVC hose (35); the first-stage solid desorption chamber (22) is a horizontal hollow cylinder, which is installed on the bracket (27), is sealed on the left and right sides, and is provided with an exhaust pipe ( 17), an infrared temperature sensor (24) and a dust concentration sensor (25) are provided in the bin and connected to a digital display (23) outside the bin, an insulation layer (47) is provided around the bin, the top is connected to the bottom of the feed pipe (5), and the bottom is connected to a nitrogen protection device (46) through a PVC hose (35), a spiral auger (26) is provided on the center line of the first-stage solid desorption bin (22), and one side of the top is connected to a gas condensation system through an insulation pipe (21); the liquid evaporation bin (18) is a hollow cylindrical tube, a spiral gas pipeline (19) is provided inside, and the surrounding The liquid evaporation chamber (18) is provided with an insulation layer (47) around it, a heater (20) is provided at the bottom, one side of the top is connected to a collecting pipe, and the center is connected to a gas condensation system through an insulation pipe (21); the spiral gas pipeline (19) is installed along the inner surface of the liquid evaporation chamber (18), the air inlet is at the bottom of the evaporation chamber and is connected to the tubular combustion chamber (42) through the insulation pipe (21); the exhaust pipe (17) is located at the top of one side of the liquid evaporation chamber (18) and is connected to the spiral gas pipeline (19); the top of the water storage bottle (28) is connected to the air inlet of the spiral gas pipeline (19) The bottom is connected to the backfill system through a seamless steel pipe (9); the infrared temperature sensor (24) is placed in the first-stage solid desorption bin (22), connected to the digital display (23) outside the bin, and can monitor the temperature in the bin; the dust concentration sensor (25) is located in the first-stage solid desorption bin (22), connected to the digital display (23) outside the bin, and can monitor the dust concentration in the bin; the digital display (23) is connected to the infrared temperature sensor (24) and the dust concentration sensor (25), and can display the temperature and dust concentration in the bin, and will issue an alarm when the dangerous threshold is reached.

6. The multi-stage heat treatment and repair equipment for oily sludge according to claim 4 is characterized in that: The second-stage heat treatment system comprises a digital display (23), an infrared temperature sensor (24), a dust concentration sensor (25), a spiral auger (26), a second-stage solid desorption bin (33), a PVC hose (35), and a nitrogen protection device (46); the second-stage solid desorption bin (33) is a horizontal hollow cylindrical tube, mounted on a bracket (27), sealed on both sides, an exhaust pipe (17) on one side, a spiral auger (26) on the center line, an insulation layer (47) arranged around the bin, an infrared temperature sensor (24) and a dust concentration sensor (25) arranged inside the bin and connected to the digital display (23) outside the bin, one bottom side is connected to the nitrogen protection device (46) through a PVC hose (35), the top is connected to the first-stage solid desorption bin (22) through a feed bin (32), one side of the top is connected to a gas condensation system through an insulation pipe (21), and the bottom is connected to a discharge pipe (34).

7. The multi-stage heat treatment and repair equipment for oily sludge according to claim 1 is characterized in that: The gas condensation process is completed in a gas condensation system; the gas condensation system is composed of an insulation pipe (21), a condensation bin (36), a collection bin (37), a condensation pipe (38), a spherical collection pipe (39), a second heater (40), and a collection pipe (48); the condensation bin (36) is a hollow rectangular parallelepiped, with an insulation layer (47) provided around the bin, a collection bin (37) at the bottom, a second heater (40) provided on one side, and condensation pipes (38) arranged in a U shape in the bin; the air inlet end of the condensation pipe (38) is connected to the first-stage heat treatment system and the second-stage heat treatment system through the insulation pipe (21), and the air outlet end of the condensation pipe (38) is connected to the exhaust gas treatment system; the top of the spherical collection pipe (39) is connected to the U-shaped pipe at the bottom of the condensation pipe (38), and the bottom of the collection pipe (48) controlled by a valve (10) extends into the collection bin (37).

8. The multi-stage heat treatment and repair equipment for oily sludge according to claim 1 is characterized in that: The drying treatment and tail gas combustion process are completed in the tail gas treatment system; the tail gas treatment system is composed of an insulation pipe (21), a spherical drying pipe (41), and a tubular combustion chamber (42); one end of the spherical drying pipe (41) is connected to the gas outlet end of the condenser pipe (38), and the other end is connected to the tubular combustion chamber (42), and a desiccant is provided inside for drying uncondensed gas; the tubular combustion chamber (42) is composed of a flame tube (45), a nozzle (43), and an outer tube (49), and the inlet and outlet are respectively connected to the spherical drying pipe (41) and the air inlet of the spiral gas pipeline (19) through the insulation pipe (21), and the uncondensed petroleum hydrocarbon gas can be completely burned, and the high-temperature gas generated by the combustion is discharged through the spiral gas pipeline (19); the flame tube (45) is placed on the inner center line of the outer tube (49), and the tube body has an air inlet hole (44), one end is connected to the nozzle (43), and the other end is connected to the gas outlet.

9. The multi-stage heat treatment and repair equipment for oily sludge according to claim 1 is characterized in that: The spray dust removal and backfilling process is completed in the backfilling system; the backfilling system is composed of a spray pipe (29), a sprayer (30), a conveyor belt (31), and a discharge pipe (34); the spray pipe (29) is located above the conveyor belt (31), and one end is connected to the bottom of the water storage bottle (28); the sprayers (30) are arranged at equal distances directly below the spray pipe (29); one side of the conveyor belt (31) is located below the discharge pipe (34) to backfill the soil material; the discharge pipe (34) is located at the bottom of the second-stage solid desorption bin (33) and can deliver the soil material to the conveyor belt (31).

10. An operating method of the multi-stage thermal treatment and remediation equipment for oily sludge as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: The oily sludge is screened and placed in a pressurized bin (1), and the first-stage solid desorption bin (22) is preheated to 150°C; S2: The oily sludge is compacted in the pressurizing bin (1), and the liquid enters the sedimentation tank (11), where it is separated by the stirring device (13) at an accelerated rate. The solid enters the first-stage solid desorption bin (22) after passing through the crushing bin (6), and the spiral auger (26) is started. At the same time, the condensate in the condensation bin (36) is preheated to 109°C. S3: The upper layer of liquid pollutants in the sedimentation tank (11) is pumped into the liquid evaporation chamber (18) by a water pump and heated to 300° C. for evaporation. The valve (10) of the insulation pipe (21) between the liquid evaporation chamber (18) and the first-stage solid desorption chamber (22) is opened, and the mixed gas enters the gas condensation system. At the same time, the second-stage solid desorption chamber (33) is preheated to 600° C.; S4: The petroleum hydrocarbon gas in the mixed gas enters the condenser (38), the condensed petroleum enters the spherical collecting tube (39) along the condenser (38), and the uncondensed gas enters the tail gas treatment system along the pipeline. At the same time, the oily sludge in the first-stage solid desorption chamber (22) enters the second-stage solid desorption chamber (33) through the feed chamber (32), the spiral auger (26) is started, and the valve (10) of the insulation pipe (21) of the second-stage solid desorption chamber (33) is opened; S5: After being dried, the uncondensed gas enters the tubular combustion chamber (42) for full combustion, and the high-temperature gas after combustion passes through the spiral gas pipeline (19) to heat and evaporate the liquid pollutants in the liquid evaporation chamber (18), and at the same time, the discharge pipe (34) of the second-stage solid desorption chamber (33) is opened, and the soil material is sent to the conveyor belt (31) through the discharge pipe (34); S6: the desorbed soil is directly backfilled after being sprayed on the conveyor belt (31), and the bottom output pipe (12) of the sedimentation tank (11) is opened to discharge the lower liquid and sediment; S7: Open the valve (10) of the collecting pipe (48) of the condensate bin (36) to collect the oil in the collecting bin (37).

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