Solid particle-containing oil-based slurry treatment system and treatment process

Abstract

The present application belongs to the technical field of solid waste treatment. Disclosed are a solid particle-containing oil-based slurry treatment system and treatment process. The treatment system comprises a pipe; a pretreatment apparatus for providing an oil-based slurry; an anaerobic distillation apparatus, which comprises a heating device and a gas-solid separation device, the heating device being connected to the pretreatment apparatus, and the gas-solid separation device being connected to the heating device; an overheating separation apparatus, which comprises a steam generating device and a filtering and separation device, the filtering and separation device being connected to the gas-solid separation device, and the steam generating device being connected to the filtering and separation device and the heating device; and a steam fractionation device for condensation fractionation. The treatment process comprises: starting the pretreatment apparatus, the anaerobic distillation apparatus, the overheating separation apparatus and the steam fractionation apparatus; heating an oil-based slurry for gas-solid separation; carrying out filtering for gas-solid separation again; and finally carrying out condensation fractionation. The present application can pretreat slurry, so as to effectively treat an oil-based slurry into oil, water and solid particles that meet discharge standards, and has the advantages of energy conservation and emission reduction.

Description

Oil-based slurry mixed with solid particles treatment system and treatment process TECHNICAL FIELD

[0001] The application belongs to the technical field of solid waste treatment, and particularly relates to an oil-based slurry mixed with solid particles treatment system and treatment process. BACKGROUND

[0002] Oil-based drill cuttings, also known as oil-based drilling cuttings, are solid waste produced by contact between drilling fluid and formation rock during oil drilling. With continuous exploration and development of shale gas, a large amount of hazardous waste-oil-based drill cuttings is produced during drilling. The treatment of oil-based drill cuttings is an important environmental protection problem for the drilling process of shale gas. If not treated harmlessly, it will cause serious pollution of the oil and gas field environment. The oil-based drill cuttings produced in the traditional drilling process are first dehydrated on the drilling platform and then sent to a hazardous waste treatment plant. The oil-based drill cuttings entering the hazardous waste treatment plant have low liquid content and are dispersible, and can be directly sent to a rotary kiln for treatment. TECHNICAL PROBLEM

[0003] With the change of the market, the dehydration link of oil-based drill cuttings is gradually cancelled on the drilling platform, and the oil-based drill cuttings exist in the form of slurry with high liquid content. These oil-based drill cuttings are sent to a hazardous waste treatment plant for treatment. Since the oil-based drill cuttings slurry contains a large amount of oil and water and contains a variety of surfactants, it is in a viscous emulsified state and is difficult to separate. The existing hazardous waste treatment plant constructed for oil-based drill cuttings powder cannot adapt to the treatment of oil-based drill cuttings slurry, and the oil-based drill cuttings treatment industry urgently needs new treatment technology. TECHNICAL SOLUTION

[0004] The application aims to at least solve the technical problem of lack of hazardous waste treatment of oil-based drill cuttings slurry to some extent. To this end, the application provides an oil-based slurry mixed with solid particles treatment system and treatment process. By establishing a pretreatment device and process for oil-based slurry, the slurry can be pretreated, and the oil-based slurry can be effectively treated into oil, water and solid particles that meet the emission requirements, which is suitable for the existing drilling process and has the advantages of energy saving and emission reduction.

[0005] In a first aspect, an embodiment of the application provides an oil-based slurry mixed with solid particles treatment system, which comprises a pipeline and devices connected by the pipeline, wherein the devices connected by the pipeline comprise:

[0006] a pretreatment device for providing oil-based slurry to the connected devices;

[0007] an oxygen-free distillation device comprising a heating device with an inlet and an outlet, and a gas-solid separation device with a solid particle outlet one and a steam outlet one, the inlet of the heating device being connected with the pretreatment device, and the gas-solid separation device being connected with the outlet of the heating device;

[0008] The superheating separation device comprises a steam generator for providing steam, a filter separation device for filtering solid particles, the filter separation device having a solid particle outlet two and a steam outlet two, the filter separation device being connected to the steam outlet one through a pipeline, the steam generator being connected to the pipeline between the filter separation device and the gas-solid separation device, and the steam generator being connected to the inlet of the heating device;

[0009] The steam fractionation device is connected to the steam outlet two.

[0010] In an optional embodiment, the steam generator comprises a steam generator and a steam heater for heating the steam into superheated steam, the steam heater being arranged on the pipeline between the steam generator and the filter separation device, and the steam generator being connected to the inlet of the heating device.

[0011] In an optional embodiment, the filter separation device comprises multiple stages, the filter material layer of the upper filter separation device in the adjacent stage has a larger pore size than the filter material layer of the lower filter separation device, a flow valve is arranged between each filter separation device and the steam generator, the filter separation device is provided with a temperature detection device, and a feedback control loop is formed between the flow valve and the temperature detection device.

[0012] In an optional embodiment, the steam fractionation device comprises:

[0013] A primary condensation device for fractionating condensed oil, the primary condensation device being connected to the steam outlet two, and the primary condensation device having a water vapor outlet and a condensed oil outlet;

[0014] A secondary condensation device for fractionating condensed water, the secondary condensation device being connected to the water vapor outlet, and the secondary condensation device having a condensed water outlet and a non-condensed gas outlet.

[0015] In an optional embodiment, the pretreatment device comprises:

[0016] A raw material mixing device for mixing an oil-based slurry and dry materials, the dry materials being the solid particles discharged from the solid particle outlet one and the solid particle outlet two;

[0017] A feeding device for continuously providing the oil-based slurry to the raw material mixing device;

[0018] A mixing and conveying device for conveying the mixed materials of the oil-based slurry and the dry materials to the heating device, the mixing and conveying device being connected to the raw material mixing device.

[0019] In an optional embodiment, the pre-treatment device further comprises a dry material back injection pipe and a humidity detection device, the dry material back injection pipe comprises a pipe connecting the first solid particle outlet, the second solid particle outlet and the raw material mixing device, and a regulating valve installed on the pipe, the humidity detection device and the regulating valve form a feedback control loop, and the humidity detection device is connected to the raw material mixing device or the mixed material conveying device.

[0020] In an optional embodiment, the raw material mixing device is provided with an oil-water vapor outlet connected to the filter separation device.

[0021] In an optional embodiment, the inner wall of the heating device in contact with the mixed material is provided with a non-stick coating.

[0022] In a second aspect, the embodiments of the present application provide a processing process of oil-based slurry mixed with solid particles, which uses the oil-based slurry mixed with solid particles processing system described above, and the processing process comprises the following steps:

[0023] The pre-treatment device is started, and the solid particles discharged from the oxygen-free distillation device and the superheated separation device are added to the oil-based slurry for mixing;

[0024] The oxygen-free distillation device is started, and the oil-based slurry is distilled by heating, and then separated into solid particles and primary steam, wherein the heating temperature is less than or equal to the boiling point of the oil-based slurry;

[0025] The superheated separation device is started, and the primary steam is filtered to produce solid particles and secondary steam;

[0026] The steam fractionation device is started, and the secondary steam is fractionally condensed to produce condensed oil and condensed water.

[0027] In an optional embodiment, when the superheated separation device is used for processing, the steam temperature generated by the steam generating device is greater than or equal to the temperature of the primary steam. Advantages

[0028] The advantages of the present application are:

[0029] 1. The processing system of this application provides oil-based slurry to an anaerobic distillation unit through a pretreatment device. The slurry is heated by a heating device, processing it into a mixture of solid particles and steam. This mixture is then separated into solid particles and primary steam by a gas-solid separation device. The generated primary steam is maintained at a high temperature by a steam generator and further separated into solid particles and secondary steam by a superheated separation device. The secondary steam is then condensed and fractionated into oil and water by a steam fractionation device. Through this process, the heating device and steam generator maintain the oil-based slurry or steam at a high temperature, and the separated solid particles remain in a high-temperature, dry state, effectively processing the oil-based slurry. Therefore, this application, by establishing a pretreatment device and process for oil-based slurry, can pretreat the slurry, effectively processing it into oil, water, and solid particles that meet discharge standards. This is suitable for existing drilling processes and also has the advantages of energy saving and emission reduction.

[0030] 2. This application innovatively proposes a process for treating oil-based slurry. First, the oil-based slurry and dry material are mixed, and the residual heat of the dry material is used to heat the oil-based slurry for the first time, which also increases the mixing effect. Then, the oil-based slurry is heated and maintained below the boiling point, which effectively converts the oil-based slurry into a solid particle state and a steam state, thereby facilitating the separation of solid particles and primary steam. Then, the primary steam is further filtered and separated under superheated conditions to produce solid particles and secondary steam. Finally, condensation treatment is performed, thereby effectively treating and separating the oil-based slurry into three phases: oil, water, and solid. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other embodiments and drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 shows a schematic diagram of an embodiment of the oil-based slurry treatment system containing solid particles of the present invention;

[0033] Figure 2 shows a schematic diagram of the steps of an embodiment of the pretreatment device of the present invention;

[0034] Figure 3 shows a schematic diagram of the steps of an embodiment of the anaerobic distillation apparatus of the present invention;

[0035] Figure 4 shows a schematic diagram of the steps of an embodiment of the superheated separation device of the present invention;

[0036] Figure 5 shows a schematic diagram of the steps of an embodiment of the steam fractionation equipment of the present invention;

[0037] Reference signs: 100, pretreatment device; 110, feeding device; 111, forklift truck; 112, special ton barrel; 113, hopper; 114, shaftless screw conveyor; 120, dry material back-feeding pipe fitting; 121, regulating valve; 130, raw material mixing device; 140, mixed material conveying device; 150, humidity detection device; 200, oxygen-free distillation device; 201, solid particle outlet one; 202, steam outlet one; 210, heating device; 220, gas-solid separation device; 221, kiln head cover; 222, cyclone separator; 300, superheating separation device; 301, flow valve; 302, temperature detection device; 303, solid particle outlet two; 304, steam outlet two; 310, steam generating device; 311, steam generator; 312, steam heater; 320, filtration separation device; 321, primary particle dust collector; 322, secondary particle dust collector; 400, steam fractionation device; 410, primary condensing device; 411, water-cooled valve one; 420, secondary condensing device; 421, water-cooled valve two; 430, tertiary condensing device; 440, quaternary condensing device; 500, pipeline. Best mode of the present application

[0038] The present application is described below in conjunction with the accompanying drawings and with reference to specific embodiments:

[0039] Please refer to Fig. 1, the first aspect embodiment of the present application provides a solid particle mixed oil-based slurry processing system, the oil-based slurry usually contains oil, water (usually emulsified), fine particle solid waste, and organic clay, oil-soluble chemical treatment agent, etc., the present embodiment takes oil-based drill cuttings as an example for illustration, and the processing system is used for processing of oil-based drill cuttings. The processing system comprises a pipeline 500 and the following devices connected by the pipeline 500: a pretreatment device 100, an oxygen-free distillation device 200, a superheated separation device 300 and a steam fractionation device 400, the pipeline 500 adopts a conventional pipe structure as a conveying pipe, such as a steel pipe, a PVC pipe, etc. The pretreatment device 100 is used to provide the connected devices with oil-based slurry, such as a hopper and a pump for collecting slurry, the outlet of the hopper is connected to the oxygen-free distillation device 200 through the pipeline 500, and the oil-based slurry is pumped to the oxygen-free distillation device 200 by the pump; the oxygen-free distillation device 200 comprises a heating device 210 with an inlet and an outlet, and a gas-solid separation device 220 with a solid particle outlet 201 and a steam outlet 202, the inlet of the heating device 210 is connected to the pretreatment device 100, the oil-based slurry is injected into the heating device 210 through the pretreatment device 100, the heating device 210 has a cavity inside, the oil-based slurry enters the cavity through the inlet of the heating device 210, the oil-based slurry is heated in the heating device 210, the gas-solid separation device 220 is connected to the outlet of the heating device 210, then the heated oil-based slurry is discharged from the outlet of the heating device 210 to the gas-solid separation device 220, at this time, the oil-based slurry is in a solid particle state and a steam state, the solid particle outlet 201 is located at the bottom of the gas-solid separation device 220, and the steam outlet 202 is located at the top of the gas-solid separation device 220, finally, the solid particles are discharged from the solid particle outlet 201, and the primary steam is discharged from the steam outlet 202 to the superheated separation device 300.

[0040] The overheating separation device 300 comprises a steam generating device 310 for providing steam, a filtering separation device 320 for filtering solid particles, the filtering separation device 320 being provided with a solid particle outlet two 303 and a steam outlet two 304, the filtering separation device 320 being connected to the steam outlet one 202 through a pipeline 500, the primary steam discharged from the steam outlet one 202 entering the filtering separation device 320 through the pipeline 500, the filtering separation device 320 being a conventional filter provided with a filter layer through which the primary steam passes, fine particles being left on one side of the filter layer, and the steam continuing to be discharged from the steam outlet two 304 after passing through the filter layer; the inlet of the filtering separation device 320 being arranged at the top thereof, the solid particle outlet two 303 being arranged at the bottom of the filtering separation device 320, and the steam outlet two 304 being arranged at the top of the filtering separation device 320, the filter layer being provided with a plurality of vertically spaced filter layers, the primary steam entering the filtering separation device 320 flowing downward and flowing laterally along the filter layer to flow from the top of the filter layer to the steam outlet two 304 to form secondary steam, the secondary steam being discharged from the steam outlet two 304 to the distillation separation device. The steam generating device 310 is connected to the pipeline 500 between the filtering separation device 320 and the gas-solid separation device 220, the steam generating device 310 being a conventional steam generating device, the steam outlet thereof being connected to the pipeline 500 between the steam outlet one 202 and the inlet of the filtering separation device 320, so that the steam generated by the steam generating device 310 can be mixed with the primary steam to participate in the steam treatment process of the oil-based slurry and maintain a certain high temperature to avoid condensation of the oil-based slurry, the steam generating device 310 being connected to the inlet of the heating device 210, the steam generating device 310 also being connected to the inlet of the heating device 210 through another pipeline 500, the steam entering the heating device 210 to enhance the flow of the oil-based slurry in the cavity of the heating device 210. The steam distillation device 400 is used for condensing and separating the steam, the inlet of the steam distillation device 400 being connected to the steam outlet two 304, the secondary steam entering the steam distillation device 400, the distillation separation device being a conventional water-cooled condensation separation device, the secondary steam being cooled by being subjected to heat exchange through the introduction of cold water, the steam being condensed to produce oil and water after being cooled, the oil and water being treated by a conventional separation method, and a chemical additive being added to reduce the COD content of the water.

[0041] The existing hazardous waste treatment plant lacks an oil-based slurry treatment device, because the current hazardous waste treatment plant is for treating dewatered oil-based solid waste, and is not suitable for slurry treatment. The slurry treatment has great difficulty, because, on the one hand, during the heating process of the oil-based slurry in the existing rotary kiln, the material is coked and attached to the inner wall of the kiln. With the development of the coking phenomenon, the wall heat transfer coefficient decreases sharply, eventually leading to the shutdown of the device for cleaning. On the other hand, during the heating process of the oil-based solid waste, high-temperature oil-water mixed steam is continuously generated, and a large amount of fine dust is entrained in the steam. The gas-solid separation under high-temperature state is difficult and has high cost. The system is extremely unstable, and the oil in the oil-water mixed steam has the characteristics of high boiling point and easy condensation, which is easy to block the device. The third aspect is that the oil-based solid waste heat separation produces wastewater with extremely high COD concentration, and the COD concentration even reaches tens of thousands of milligrams per liter, which brings great difficulty to the subsequent wastewater treatment. The fourth aspect is that the oil-based solid waste contains a large amount of surfactant, which enters the oil-water mixture after condensation with the oil-water steam, so that the condensed oil-water is in an emulsified state, and the oil and water are difficult to separate. Therefore, there is a certain difficulty in the current hazardous waste treatment of oil-based solid waste.

[0042] The present application provides oil-based slurry to the oxygen-free distillation device 200 through the pretreatment device 100, heats the oil-based slurry through the heating device 210, processes the oil-based slurry into a mixed state of solid particles and steam, and then separates the solid particles and the first steam through the gas-solid separation device 220. The first steam is mixed oil-water steam with fine particles. The first steam generated is kept in a high-temperature state by the steam generation device 310, and then the solid particles and the second steam are separated by the superheating separation device 300. The second steam is condensed and fractionated into oil and water by the steam fractionation device 400. Through the above-mentioned devices, the oil-based slurry or the steam can be kept in a high-temperature state by the heating device 210 and the steam generation device 310, and the separated solid particles are kept in a dry state at a high temperature. Therefore, the oil-based slurry can be effectively treated. Therefore, by establishing the pretreatment device and process of the oil-based slurry, the slurry can be pretreated, the oil-based slurry can be effectively treated into oil, water and solid particles that meet the emission requirements, and the process is suitable for the existing drilling process and has the advantages of energy saving and emission reduction.

[0043] The second aspect of the present application provides a treatment process for oil-based slurry mixed with solid particles, which adopts the above-mentioned oil-based slurry mixed with solid particles treatment system. The treatment process comprises:

[0044] S1, start the pretreatment device 100, and add the solid particles discharged from the oxygen-free distillation device 200 and the superheating separation device 300 into the oil-based slurry for mixing; for example, the oil-removed high-temperature dry residue generated in the oxygen-free distillation device 200 and the superheating separation device 300 is dry-wet mixed with the oil-based rock slurry; since the oil-removed high-temperature dry residue has the characteristics of hydrophobicity and oleophilicity, the mixing with the oil-based rock slurry has good workability; since the oil-removed dry residue has been screened and treated, the particle size is uniform, the mixing material has good dispersibility, and the rotary kiln is easy to process; the oil-removed high-temperature dry residue comes from the oxygen-free distillation device 200 and the superheating separation device 300, raw materials are easy to obtain, and the cost is low; and since the dry residue is used for mixing, the sensible heat of the dry residue is utilized in the mixing process, a part of the water is evaporated, the material waste heat is utilized, and energy consumption is reduced.

[0045] S2, start the oxygen-free distillation device 200, and distill the oil-based slurry by heating, and then separate the oil-based slurry into solid particles and primary steam; in order to further reduce the problem of coking and wall adhesion of the inner wall of the cylinder, the process adopts a medium-temperature distillation technology, that is, the temperature in the kiln is controlled to be near the upper limit of the boiling range of the oil, which is lower than the boiling point, so that complete separation of the oil and the residue is ensured and overheating phenomenon does not occur, and cracking and coking phenomenon of the oil due to high temperature is avoided; the gas-solid separation device 220 adopts a cyclone separator 222 with high efficiency, which can separate a large amount of dust, effectively reduce the load of subsequent particle material dust removal, and is an important link of the entire gas-solid separation.

[0046] S3, start the superheating separation device 300, filter the primary steam, and output solid particles and secondary steam; in an optional embodiment, when the superheating separation device 300 is used for processing, the steam temperature generated by the steam generating device 310 is greater than or equal to the temperature of the primary steam, the high-temperature mixed steam entering the filtering and separating device 320 is further heated by the steam generating device 310, the mixed steam has a certain superheat degree in the gas-solid separation device 220, oil gas condensation and filter layer blockage are avoided, at the same time, the superheated steam is used as a heating medium when the system starts, the filtering and separating device 320 is preheated, the high-temperature superheated steam is used as a blowing gas source of the filter layer, and the filter layer is prevented from condensing and blocking while being blown in the reverse direction; at the same time, the superheated steam amount added is automatically adjusted by the water vapor flow valve 301, so that the filtering and separating device 320 has a constant temperature. The multi-stage superheating separation device 300 is used for filtering by stages, has a good dust removal effect, is not easy to block, is stable in operation, the filtering separator uses quartz sand as the filter layer, compared with other gas-solid separation methods, can well adapt to high-temperature working conditions, raw materials are easy to obtain, and the operation and maintenance cost is greatly reduced. In order to prevent combustion and explosion accidents of high-temperature oil gas, the high-temperature oil-water mixed steam in the gas-solid separation process needs to be in a reducing atmosphere, and the application uses water vapor, which avoids the occurrence of combustion and explosion accidents and has a certain safety.

[0047] S4, start the steam fractionation equipment 400, fractionally condense the secondary steam, and output condensed oil and condensed water; according to the characteristics that each material in the oil-based slurry has different boiling points, the condensation temperature is controlled respectively, so that a large amount of organic matter with a boiling point higher than water is condensed into the oil phase, and part of the organic matter with a boiling point lower than water is kept in a gaseous state for recycling and burning, and the condensed water is separated, so that the COD concentration of the waste water is controlled at a lower level, and the purpose of clean production is achieved. According to the principle that each type of material in the mixed steam has different boiling points, the condensation temperature is controlled in sections, so that the COD content of the separated waste water is greatly reduced, and the COD content of the waste water is controlled while the steam is condensed. The outlet temperature control of the steam fractionation equipment 400 is the key to controlling the COD concentration in the condensed waste water. In order to reduce the COD concentration of the waste water, the outlet temperature of the steam fractionation equipment 400 can be further reduced, and the outlet temperature of the steam fractionation equipment 400 can be increased, so that the waste water distillation range is narrowed, thereby reducing the COD concentration of the waste water, reducing the difficulty and cost of subsequent waste water treatment, and having obvious energy saving and emission reduction effects. Recycling and burning of non-condensable organic gas is also one of the effective measures to control the COD of waste water, and recycling energy while controlling the emission of organic gas has the effect of energy saving and emission reduction. Embodiments of the present application

[0048] Please refer to FIG. 2, in the optional embodiment, the pretreatment equipment 100 includes: raw material mixing device 130, feeding device 110 and mixing and conveying device 140, the raw material mixing device 130 is used for mixing oil-based slurry and dry materials, the dry materials are solid particles discharged from solid particle outlet one 201 and solid particle outlet two 303, which respectively come from the oxygen-free distillation equipment 200 and the superheated separation equipment 300, the dry materials have high temperature, and a certain amount of water vapor is evaporated by using dry residue sensible heat in the mixing process due to the mixing of high-temperature dry materials, so as to achieve the purpose of waste heat utilization; the raw material mixing device 130 adopts a double-shaft mixer, and other devices with mixing and stirring functions can also be adopted. In the optional embodiment, the raw material mixing device 130 is provided with an oil-water steam outlet, such as a double-shaft mixer with a sealed top cover, the oil-water steam outlet is arranged on the sealed top cover, and the oil-water steam outlet is connected to the inlet of the filtering and separating device 320 through a pipeline 500, so that the generated steam is transported to the filtering and separating device 320 for treatment.

[0049] In an optional embodiment, the feeding device 110 is used to continuously provide the oil-based slurry to the raw material mixing device 130, such as the feeding device 110 being connected to the inlet of the raw material mixing device 130; the feeding device 110 includes a forklift 111 with a rotating disc, a special ton barrel 112, a hopper 113, and a shaftless screw conveyor 114, the oil-based slurry is transported to the special ton barrel 112 by the forklift 111, the oil-based slurry in the special ton barrel 112 is forked to the hopper 113 by the forklift 111, the ton barrel is lifted to the upper edge of the hopper 113 under the lifting action of the lifting arm of the forklift 111, and the slurry in the barrel is poured into the hopper 113 under the rotating action of the rotating arm, the special ton barrel 112 has a quickly opened barrel cover, which can quickly open the barrel cover, the special ton barrel 112 is provided with a fork groove for the fork arm of the forklift 111 to insert, which can quickly pour the slurry, the forklift 111 with a rotating disc cooperates with the special ton barrel 112 to load the material conveniently and efficiently with high labor efficiency. The oil-based slurry entering the hopper 113 is conveyed into the double-shaft mixer under the conveying action of the shaftless screw conveyor 114, which has the functions of not easy to be blocked and anti-winding when conveying viscous slurry; at the same time, the high-temperature oil-removed dry residue conveyed by the dry material back-feeding pipe 120 enters the double-shaft mixer, and the dry and wet materials are fully mixed under the stirring action of the double-shaft mixer, and at the same time of mixing, the mixed materials are pushed to the outlet of the raw material mixing device 130 by the stirring blades.

[0050] In an optional embodiment, the oil-based slurry from the well site has high oil and water content and is in an emulsified state, which is not suitable for direct processing in the rotary kiln and needs to be pretreated to a certain extent to reduce the liquid content of the slurry and reduce the stickiness of the material, so that the slurry changes into a powder-like material with a certain dispersibility, and then the material is conveyed to the oxygen-free distillation equipment 200. Specifically, the mixing and conveying device 140 is used to convey the mixed material of the oil-based slurry and the dry material to the heating device 210, the inlet of the mixing and conveying device 140 is connected to the outlet of the raw material mixing device 130 through the pipeline 500, the mixed material enters the hopper 113 arranged at the inlet of the mixing and conveying device 140 from the outlet, and the oil-based slurry discharged from the hopper 113 is conveyed to the inlet of the heating device 210 by the mixing and conveying device 140, such as the existing conveyor being used as the mixing and conveying device 140 to convey the oil-based slurry to the rotary kiln for heating.

[0051] In an alternative embodiment, the pretreatment device 100 further comprises a dry material back injection pipe 120 and a humidity detection device 150, the dry material back injection pipe 120 comprising a pipe 500 connecting the solid particle outlet one 201 and the solid particle outlet two 303 to the raw material mixing device 130, and a regulating valve 121 installed on the pipe 500, the humidity detection device 150 and the regulating valve 121 forming a feedback control loop, and the humidity detection device 150 being connected to the raw material mixing device 130 or the mixing and conveying device 140. The humidity detection device 150 is a component analyzer, which can detect the liquid content of the mixed material and feed the detection data to the regulating valve 121. The regulating valve 121 is an electric valve, such as a solenoid valve, which executes a pre-set program. When the detection data exceeds the pre-set value, the regulating valve 121 is automatically opened to adjust the amount of dry material added, thereby controlling the humidity of the mixed material. In this way, the humidity of the mixed material can be controlled, the liquid content of the mixed material can be stabilized, the workload can be reduced, and the mixing efficiency can be improved.

[0052] Please refer to FIG. 3. In an alternative embodiment, the inner wall of the heating device 210 in contact with the mixed material is provided with a non-stick coating. The heating device 210 adopts a rotary kiln, which adopts an indirect heating method. A heating jacket is provided outside the kiln. High-temperature flue gas generated by burning the fuel burning machine is used to transfer heat to the oil-based slurry in the kiln through heat conduction. The slurry is continuously mixed and advanced to the discharge end under the rotation of the rotary kiln, and at the same time, the oil and water are separated by heating. During the heating process of the oil-based debris, coking and wall attachment phenomenon easily occur, which can cause the heat transfer coefficient of the cylinder wall to decrease, and even cause frequent shutdown and cleaning, resulting in the device being unable to sustain operation. In order to avoid the scaling of the rotary kiln cylinder wall, a high-temperature non-stick coating is used on the inner wall of the rotary kiln. For example, a Teflon high-temperature non-stick coating is used to coat the inner wall of the cylinder, and then the surface of the coating is processed in a special way, such as sandblasting or aluminum spraying, to make the surface more dense, thereby improving the non-stick property. The core material of the Teflon coating is polytetrafluoroethylene (PTFE), which has good heat resistance and non-stick property, and is a high polymer material widely used in the manufacture of non-stick coatings. The treated inner wall does not stick to the oil-based slurry at high temperature, the heat transfer is stable, the coating has good wear resistance, the secondary coating period is long, and the problem of coking and wall attachment of the cylinder inner wall is solved.

[0053] In an optional embodiment, the gas-solid separation device 220 comprises a kiln head cover 221 and a cyclone separator 222. The oil-removed dry residue and the oil-water mixed steam generated by gasification and separation in the rotary kiln enter the kiln head cover 221. The kiln head cover 221 is in the shape of a cylinder. An opening is arranged on the side of the kiln head cover 221 and is connected with the outlet of the heating device 210. The oil-removed dry residue generated by the oil-based slurry is discharged from the solid particle outlet one 201 at the bottom end of the kiln head cover 221 under the action of gravity. The oil-water high-temperature mixed steam carrying fine dust flows upward in the kiln head cover 221. The cyclone separator 222 is fixed at a position close to the top inside the kiln head cover 221. The outer diameter of the cyclone separator 222 is smaller than that of the kiln head cover 221. The cyclone separator 222 is arranged with a steam inlet on the side. The bottom end of the cyclone separator 222 is a particle outlet. The top end of the cyclone separator 222 is a steam outlet two 202. The mixed steam enters the cyclone separator 222. Under the action of centrifugal force, most of the dust is separated and falls into the kiln head cover 221 from the particle outlet at the bottom end of the cyclone separator 222 and is then discharged from the solid particle outlet one 201. The dust-removed mixed steam is discharged from the steam outlet two 202. The cyclone separator 222 is arranged inside the kiln head cover 221, which can ensure that the temperature of the dust collector is the same as the temperature of the material, thereby avoiding oil gas condensation and blockage. The cyclone separator 222 has a dust removal efficiency of about 95% for dust with a particle size greater than 10 μm. Most of the dust in the mixed steam is removed in the cyclone separator 222, which reduces the load of subsequent particle material dust removal and ensures the stable operation of the system.

[0054] Please refer to FIG. 4. In an optional embodiment, because the rotary kiln adopts a distillation mode below the boiling point, the mixed steam discharged from the rotary kiln is in a saturated state. A slight change in temperature and pressure will cause the steam to condense. To avoid the condensation phenomenon, the present process adopts a steam generating device 310. The steam generating device 310 comprises a steam generator 311 and a steam heater 312. The steam heater 312 is used to heat the steam into superheated steam. The steam heater 312 is a further heating device for the steam generating device 310 to heat the steam to about 500°C. The steam generating device 310 is connected to the inlet of the filtering and separating device 320 through a pipeline 500. The steam heater 312 is arranged on the pipeline 500 between the steam generator 311 and the filtering and separating device 320. The generated steam is mixed with the primary steam to increase the temperature of the steam entering the filtering and separating device 320 to about 400°C, thereby generating a certain degree of superheat to avoid oil gas condensation. The steam outlet of the steam generator 311 is also connected with another pipeline 500, which is in communication with the inlet of the heating device 210. In this way, during the start-up stage, the water vapor generated by the steam generating device 310 can preheat the oil-based slurry in the heating device 210.

[0055] In an optional embodiment, the filtering separation device 320 is provided with multiple stages, the multiple-stage filtering separation device 320 is sequentially connected in order of each stage process, each filtering separation device 320 is a filter with a filter layer, the pore size of the filter layer of the upper-stage filtering separation device 320 is greater than that of the lower-stage filtering separation device 320 in adjacent stages, the steam outlet of the upper-stage filtering separation device 320 is connected to the inlet of the lower-stage filtering separation device 320, a flow valve 301 is arranged on the pipeline 500 between each filtering separation device 320 and the steam generation device 310, the filtering separation device 320 is provided with a temperature detection device 302, a feedback control loop is formed between the flow valve 301 and the temperature detection device 302, the temperature detection device 302 adopts a temperature sensor, the temperature sensor transmits temperature data to the flow valve 301, the flow valve 301 is an electric valve such as an electromagnetic valve, which is provided with an execution program, and can control the flow size according to the temperature data, so as to adjust the input amount of water vapor, which is convenient for automatically controlling the temperature of the filtering separation device 320 and keeping the steam temperature constant.

[0056] In an optional embodiment, the multiple-stage filtering separation device 320 adopts an existing particle dust collector with a filtering function, including a first-stage particle dust collector 321 and a second-stage particle dust collector 322, the first-stage particle dust collector 321 adopts quartz sand with a diameter of 2mm±0.2mm after screening as a filter layer, which is filled in a circular annulus composed of inner and outer porous tubes, and the thickness of the filter layer is about 200mm±0.2mm. Dust-containing mixed steam enters the inner cylinder through the quartz sand filter layer outside the porous tube, and the filter layer traps part of the dust, when the dust accumulates to a certain extent, it is discharged through the solid particle outlet 303 under the action of gravity, and the oil-water mixed steam after dust removal is collected in the upper clean gas chamber through the inner cylinder of multiple filter tubes; the filter layer of long-term operation will be blocked due to the accumulation of dust, the water vapor generated by the steam generation device 310 enters the particle dust collector for blowing, the filter layer is blown at regular intervals to restore the ventilation performance of the filter layer. The second-stage particle dust collector 322 has the same structure and operation mode as the first-stage particle dust collector 321, the difference is that quartz sand is used as the filter layer in the second-stage particle dust collector 322, the particle size after screening is 1mm±0.2mm, to remove finer dust, and the two-stage particle dust collector has a high-efficiency separation effect.

[0057] Please refer to Fig. 5, in the alternative embodiment, the steam fractionation device 400 comprises a primary condensing device 410 and a secondary condensing device 420, both of which are existing water-cooled condensing fractionation devices, which cool the secondary steam by passing in cold water. The primary condensing device 410 is used to fractionate condensed oil, the primary condensing device 410 is connected to the steam outlet two 304, and the primary condensing device 410 has a water vapor outlet and a condensed oil outlet. After the high-temperature steam enters the primary condensing device 410 from the steam outlet two 304, it is cooled, and the oil is condensed and fractionated; the secondary condensing device 420 is used to fractionate condensed water, the secondary condensing device 420 is connected to the water vapor outlet of the primary condensing device 410, and the secondary condensing device 420 has a condensed water outlet and a non-condensable gas outlet. After the water vapor discharged from the primary condensing device 410 enters the secondary condensing device 420, it is cooled, and the water is condensed and fractionated, and the non-condensable gas is discharged from the non-condensable gas outlet.

[0058] In the alternative embodiment, the primary condensing device 410 and the secondary condensing device 420 use a tube heat exchanger. After the dust-removed oil-water mixed steam enters the upper gas collection tank of the primary condensing device 410, the mixed steam flows downward inside the tube, and cooling water is passed into the outside (jacket) of the tube heat exchanger to cool it. The steam in the tube condenses partially, and the temperature of the material at the outlet of the primary condensing device 410 is detected by a temperature sensor. The temperature signal is transmitted to the water-cooled valve one 411 to automatically adjust the flow of cooling water and control the temperature of the material at the outlet of the primary condensing device 410 to be about 110°C, which is higher than the boiling point of water. The oil and other organic matter above the boiling point of water are condensed into a liquid state, and the water vapor and the organic matter below the boiling point of water remain in a vapor state. The secondary condensing device 420 is connected to the next process of the primary condensing device 410. The secondary condensing device 420 is arranged in the same way as the primary condensing device 410 and is also provided with a water-cooled valve two 421 for adjusting the flow of cooling water. The steam from the lower end of the primary condensing device 410 enters the upper end of the secondary condensing device 420. The temperature of the material at the outlet of the secondary condensing device 420 is controlled to be about 90°C. Most of the water vapor is condensed into liquid water, a small amount of organic matter with a boiling point close to that of water enters the water phase, and the remaining gaseous organic matter and non-condensable gas are discharged from the non-condensable gas outlet at the lower end of the secondary condensing device 420 for combustion and heat recovery. In the alternative embodiment, it also includes a tertiary condensing device 430 and a quaternary condensing device 440. The liquid oil from the lower end of the primary condensing device 410 enters the tertiary condensing device 430, which is further cooled to a safe storage temperature and then transported to a storage tank for storage. The condensed water from the lower end of the secondary condensing device 420 enters the quaternary condensing device 440, which is further cooled to room temperature and then transported to a condensed water storage tank. Industrial applicability

[0059] The existing hazardous waste treatment plant is to treat the dewatered oil-based solid waste, and lacks the treatment process of the oil-based slurry, and the application innovatively proposes the process of treating the oil-based slurry, first mixes the oil-based slurry and dry materials, uses the waste heat of the dry materials to heat the oil-based slurry for the first time, also increases the mixing effect, then heats the oil-based slurry and maintains below the boiling point, effectively converts the oil-based slurry into solid particle state and steam state, so as to separate the solid particles and primary steam, then further filters and separates the primary steam under the superheated state, outputs the solid particles and secondary steam, and then performs condensation treatment, so as to effectively treat and separate the oil-based slurry into oil, water and solid three phases, each treatment link runs stably, has the advantages of energy saving and emission reduction, and meets the environmental protection requirements.

Claims

1. An oil-based slurry treatment system incorporating solid particles, characterized by, The pipeline (500) and the devices connected by the pipeline (500) include: A pretreatment device (100) for providing an oil-based slurry to the connected devices; An oxygen-free distillation device (200) including a heating device (210) with an inlet and an outlet, a gas-solid separation device (220) with a solid particle outlet one (201) and a steam outlet one (202), the inlet of the heating device (210) being connected to the pretreatment device (100), and the gas-solid separation device (220) being connected to the outlet of the heating device (210); A superheated separation device (300) including a steam generation device (310) for providing steam, and a filter separation device (320) for filtering solid particles, the filter separation device (320) having a solid particle outlet two (303) and a steam outlet two (304), the filter separation device (320) being connected to the steam outlet one (202) by the pipeline (500), the steam generation device (310) being connected to the pipeline (500) between the filter separation device (320) and the gas-solid separation device (220), and the steam generation device (310) being connected to the inlet of the heating device (210); A steam fractionation device (400) for condensing and fractionating steam, the steam fractionation device (400) being connected to the steam outlet two (304).

2. The solids-laden oil-based mud system of claim 1, wherein, The steam generation device (310) includes a steam generator (311) and a steam heater (312) for heating steam into superheated steam, the steam heater (312) being arranged on the pipeline (500) between the steam generator (311) and the filter separation device (320), and the steam generator (311) being connected to the inlet of the heating device (210).

3. The solids-laden oil-based slurry processing system of claim 1, wherein, The filter separation device (320) is arranged in multiple stages, the filter layer pore size of the filter separation device (320) in an upper stage being larger than that in a lower stage, a flow valve (301) being arranged between each stage of the filter separation device (320) and the steam generation device (310), and a temperature detection device (302) being arranged in the filter separation device (320), a feedback control loop being formed between the flow valve (301) and the temperature detection device (302).

4. The solids-laden oil-based slurry processing system of any of claims 1-3, wherein The steam fractionation device (400) includes: A primary condensing device (410) for fractionating condensed oil, the primary condensing device (410) being connected to the steam outlet two (304), and the primary condensing device (410) having a water vapor outlet and a condensed oil outlet; A secondary condensing device (420) for fractionating condensed water, the secondary condensing device (420) being connected to the water vapor outlet, and the secondary condensing device (420) having a condensed water outlet and a non-condensed gas outlet.

5. The solids-laden oil-based slurry processing system of any of claims 1-3, wherein The pretreatment device (100) includes: a raw material mixing device (130) for mixing oil-based slurry and dry material, the dry material being solid particles discharged from the solid particle outlet one (201) and the solid particle outlet two (303); a feeding device (110) for continuously providing oil-based slurry to the raw material mixing device (130); a mixing and conveying device (140) for conveying mixed material of oil-based slurry and dry material to the heating device (210), the mixing and conveying device (140) being connected to the raw material mixing device (130).

6. The solids-laden oil-based slurry processing system of claim 5 wherein, The pretreatment device (100) further comprises a dry material back injection pipe (120) and a humidity detection device (150), the dry material back injection pipe (120) comprising a pipe (500) connecting the solid particle outlet one (201) and the solid particle outlet two (303) to the raw material mixing device (130), and a regulating valve (121) installed on the pipe (500), the humidity detection device (150) and the regulating valve (121) forming a feedback control loop, and the humidity detection device (150) being connected to the raw material mixing device (130) or the mixing and conveying device (140).

7. The solids-laden oil-based slurry processing system of claim 5 wherein, The raw material mixing device (130) is provided with an oil-water vapor outlet connected to the filtering and separating device (320).

8. The solids-laden oil-based mud system of claim 1, wherein, The inner wall of the heating device (210) in contact with the mixed material is provided with a non-stick coating.

9. A process for treating an oil-based slurry mixed with solid particles, characterized by, The oil-based slurry treatment system with solid particles according to any one of claims 1-8, the treatment process comprising: starting the pretreatment device (100) and adding solid particles discharged from the oxygen-free distillation device (200) and the superheating separation device (300) to the oil-based slurry for mixing; starting the oxygen-free distillation device (200) and distilling the oil-based slurry by heating, and then separating the oil-based slurry into solid particles and primary steam, wherein the heating temperature is less than or equal to the boiling point of the oil-based slurry; starting the superheating separation device (300) and filtering the primary steam to produce solid particles and secondary steam; starting the steam fractionation device (400) and fractionally condensing the secondary steam to produce condensed oil and condensed water.

10. The process for treating solid particulate mixed oil based slurry as claimed in claim 9 wherein, When the superheating separation device (300) is used for treatment, the steam temperature generated by the steam generating device (310) is greater than or equal to the temperature of the primary steam.

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