A secondary separation system for mineral white oil

Abstract

The invention relates to the technical field of mineral white oil production, in particular to a mineral white oil secondary separation system, comprising a first separation box, an oil pump, a second separation box and a heater; further comprising a piston mechanism, a sleeve, a nozzle and a plurality of oil outlet pipes, wherein the sleeve is sleeved on the outer wall of the piston mechanism, a piston assembly is arranged inside the piston mechanism, a vacuum chamber is arranged on the right side of the piston assembly, an input end of the nozzle is communicated with a heating interlayer, a plurality of spray heads are arranged at the output end of the nozzle, the plurality of spray heads of the nozzle are located at the upper part of a primary separation chamber of the first separation box, a plurality of separation compartments with gradually decreasing temperatures are arranged in a secondary separation chamber of the second separation box, a plurality of oil outlet pipes are installed on the second separation box, and the plurality of oil outlet pipes are respectively communicated with the plurality of separation compartments of the second separation box; the system adopts a low-pressure distillation method to reduce the boiling point of dichloromethane, improve the efficiency of distillation separation, and reduce energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of mineral white oil production, in particular to a mineral white oil secondary separation system. Background Art

[0002] Mineral white oil, also known as mineral oil or white mineral oil, is a colorless, odorless, chemically inert, and light-stable mineral oil extracted from petroleum. The prior art patent application of China with publication number CN111701263A proposes a separation process of a dichloromethane and white oil mixture, and the separation process steps are as follows: 1) Steam is introduced into a steam chamber, and the steam flows from the top to the bottom; 2) The dichloromethane and white oil mixture is added from a liquid inlet pipe to the evaporation pipe below; 3) The mixture is heated by steam to separate the gas phase dichloromethane and the liquid phase white oil, wherein the gas phase dichloromethane flows to the gas-liquid separator for gas-liquid separation; the liquid phase white oil flows out of the distillation tower from the liquid outlet pipe; 4) The distilled white oil flowing out of the distillation tower is refluxed to another liquid inlet pipe at the top, and steps 2) and 3) are repeated to realize the secondary distillation of the distilled white oil, or after the secondary distillation of the distilled white oil is completed, the above secondary distillation process is repeated to realize multiple distillations of the distilled white oil. The invention performs distillation of white oil twice or more times, and the content of dichloromethane in the finished white oil is within 80 ppm, and the content of white oil in dichloromethane is within 20 ppm.

[0003] However, the above-mentioned prior art uses a steam distillation tower to heat the white oil mixture and distill and separate the dichloromethane in the white oil mixture. The gas pressure in the distillation tower is higher than the normal pressure. Therefore, the boiling point of the dichloromethane in the mixture is high, the efficiency of the distillation separation is low, and the energy consumption is also high. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a mineral white oil secondary separation system which adopts low-pressure distillation to reduce the boiling point of dichloromethane, improve the efficiency of distillation separation, and reduce energy consumption.

[0005] The present invention discloses a mineral white oil two-stage separation system, comprising a first separation box, an oil pump, a second separation box and a heater, wherein a first separation chamber is arranged inside the first separation box, a second separation chamber is arranged inside the second separation box, the heater is installed at the bottom of the second separation chamber of the second separation box, the input end and the output end of the oil pump are respectively connected with the first separation chamber of the first separation box and the second separation chamber of the second separation box; the system also comprises a piston mechanism, a sleeve, a nozzle and a plurality of oil outlet pipes, the sleeve is sleeved on the outer wall of the piston mechanism, a heating interlayer is arranged between the sleeve and the piston mechanism, and the piston mechanism A piston assembly is arranged inside the structure, and the right side of the piston assembly is an exhaust chamber. The primary separation chamber of the first separation box and the exhaust chamber are in one-way communication with the external dichloromethane collection system; the left side of the piston assembly is a pressurized chamber, the external mixed liquid inlet pipe, the pressurized chamber and the heating interlayer are in one-way communication, the input end of the nozzle is in communication with the heating interlayer, and a plurality of spray heads are arranged at the output end of the nozzle, and the plurality of spray heads of the nozzle are located at the upper part of the primary separation chamber of the first separation box, the secondary separation chamber of the second separation box is provided with a plurality of separation compartments with gradually decreasing temperatures, and a plurality of oil outlet pipes are installed in the second separation box On the upper part, multiple oil outlet pipes are respectively connected with multiple separation compartments of the second separation box; when working, when the piston assembly moves to the right side of the piston mechanism, the mixed liquid of dichloromethane and white oil enters the pressurized chamber of the piston mechanism through the inlet pipe, and at the same time, the piston assembly transports the gas in the vacuum chamber to the external dichloromethane collection system; when the piston assembly moves to the left side of the piston mechanism, the piston assembly pressurizes the mixed liquid and inputs it into the heating interlayer between the piston mechanism and the sleeve. Since the mixed liquid is pressurized and the piston assembly generates heat by friction, the temperature of the mixed liquid in the heating interlayer increases. When the mixed liquid in the hot interlayer exceeds the pressure of the pressure limiting valve of the nozzle, the mixed liquid is sprayed into the primary separation chamber of the first separation box in the form of oil mist through the multiple spray heads of the nozzle, and at the same time, the piston assembly moves leftward to increase the volume of the pumping chamber, thereby pumping out the gas in the primary separation chamber of the first separation box, so that the primary separation chamber of the first separation box is in a low-pressure state, thereby reducing the boiling point of dichloromethane, so that the dichloromethane in the oil mist of the mixed liquid sprayed into the primary separation chamber is quickly volatilized at a lower temperature and pumped into the pumping chamber, realizing the dual functions of pressurized feeding and pumping out of the piston mechanism;After the oil mist of the mixed liquid is collected at the bottom of the primary separation chamber of the first separation box, it is input into the secondary separation chamber of the second separation box through an oil pump. The heater heats the mixed liquid to make the temperature of the mixed liquid reach the boiling temperature of the elemental white oil with the second highest boiling point in the mixed liquid, so that except for the elemental white oil with the highest boiling point remaining at the bottom of the separation chamber of the second separation box, the vapors of the other multiple mixed oils pass through multiple separation compartments in sequence. Since the temperature of the separation compartments is gradually reduced, the vapor of the mixed oil passes through multiple separation compartments to distill out the elemental white oil with the second highest boiling point, the elemental white oil with the third highest boiling point in sequence, etc. The multiple elemental white oils separated by distillation are respectively input into an external elemental white oil collection device through multiple oil outlet pipes, thereby realizing two-stage separation of the mixed liquid, and low-pressure distillation is adopted in the primary separation to reduce the boiling point of dichloromethane, improve the efficiency of distillation separation, and help reduce energy consumption, with good practicality. ;

[0006] Preferably, the piston mechanism includes a piston cylinder, a piston assembly, an air extraction pipe, a one-way valve four, a liquid inlet pipe and a liquid outlet pipe, the piston assembly includes a piston body and a shaft tube, an air extraction pipe is arranged at the right end of the piston cylinder, the air extraction pipe is connected with the middle part of the primary separation chamber of the first separation box, a one-way valve one from the first separation box to the piston cylinder is arranged inside the air extraction pipe, a liquid inlet pipe and a liquid outlet pipe are arranged at the left end of the piston cylinder, a one-way valve two from the outside to the piston cylinder is arranged in the liquid inlet pipe, a one-way valve three from the piston cylinder to the heating interlayer between the sleeve and the piston mechanism is arranged in the liquid outlet pipe, the piston body is slidably installed in the piston cylinder, the right side of the piston body is an air extraction chamber, the left side of the piston body is a pressurizing chamber, a through hole is arranged in the middle of the piston body, the middle part of the shaft tube is slidably connected with the left end of the piston cylinder, the right end of the shaft tube is concentrically connected with the piston body, the shaft tube is connected to the through hole of the piston body, and the piston body A one-way valve four is arranged from the piston cylinder to the shaft tube in the through hole, and the outer end of the shaft tube is connected to the external dichloromethane collection system; when the shaft tube drives the piston body to move toward the right end of the piston cylinder, the mixed liquid enters the pressurized chamber on the left part of the piston cylinder through the liquid inlet pipe, and the dichloromethane vapor in the pumping chamber is input into the external dichloromethane collection system through the one-way valve four and the shaft tube; when the shaft tube drives the piston body to move toward the left end of the piston cylinder, the mixed liquid is pressurized and enters the heating interlayer between the piston mechanism and the sleeve through the liquid outlet pipe, and the volume of the pumping chamber is increased so that the dichloromethane vapor in the primary separation chamber of the first separation box is pumped into the pumping chamber through the pumping pipe, thereby realizing the pressurized transportation of the mixed liquid and the efficient extraction of dichloromethane and creating a low-pressure environment in the primary separation chamber of the first separation box, with multiple functions and simple structure.

[0007] Preferably, it also includes multiple fins, which are evenly installed on the outer wall of the piston cylinder in a circumference, and are located in the heating interlayer between the piston mechanism and the sleeve; the piston body and the piston cylinder generate heat through relative friction, and by arranging multiple fins, the heating efficiency of the piston cylinder for the mixed liquid is improved.

[0008] Preferably, it also includes a ring groove and a piston ring, the ring groove is arranged on the circumference of the outer wall of the piston body, the liquid inlet hole connected with the ring groove is arranged on the left end face of the piston body, and the piston ring is arranged in the ring groove; when the piston body moves toward the left end of the piston cylinder, the mixed liquid in the pressurized chamber enters the ring groove through the liquid inlet hole, and supports the piston ring outward, so that the piston ring expands outward, thereby allowing the piston ring to fill the gap between the piston body and the piston cylinder, thereby improving the sealing effect.

[0009] Preferably, it also includes a rack, a drive shaft, a bevel gear 1, a half gear 1, a shaft tube 2, a half gear 2, a bevel gear 2, a bevel gear 3 and a motor, the rack is mounted on the outer end of the shaft tube, the output shaft of the motor is drivingly connected to the drive shaft, the bevel gear is coaxially mounted on the drive shaft, the half gear 1 is mounted on the outer end of the drive shaft, the half gear 1 is meshed with the rack, the shaft tube 2 is coaxially rotatably sleeved on the drive shaft, the half gear 2 is mounted on the outer end of the shaft tube 2, the half gear 2 is arranged opposite to the half gear 1, the half gear 2 is meshed with the rack, the bevel gear 2 is concentrically mounted on the inner end of the shaft tube 2, the bevel gear 1 and the bevel gear 3 are meshed with each other Gear 2 is meshed with bevel gear 3; the motor drives the drive shaft to rotate, and the drive shaft drives bevel gear 1 and half gear 1 to rotate clockwise. At the same time, bevel gear 1 drives bevel gear 2 and shaft tube 2 to rotate counterclockwise through bevel gear 3, and shaft tube 2 drives half gear 2 to rotate counterclockwise. Since half gear 2 and half gear 1 are arranged relative to each other, half gear 1 and half gear 2 are alternately meshed with the rack. When half gear 1 is meshed with the rack, the shaft tube and the piston body are pulled to the left. When half gear 2 is meshed with the rack, the shaft tube and the piston body are pushed to the right, thereby realizing a large stroke reciprocating movement of the piston body, which is very practical.

[0010] Preferably, it also includes a slide groove, which is installed on the bracket of the motor, and the shaft tube is slidably connected to the slide groove; the slide groove slides and limits the shaft tube to improve the stability of the shaft tube during reciprocating movement.

[0011] Preferably, it also includes a guide plate 1, the left end of which is installed on the left inner wall of the first separation box, the guide plate 1 is located between the exhaust pipe and the nozzle, and the right end of the guide plate 1 is tilted downward; the guide plate 1 blocks the oil mist falling downward and guides the oil mist to the bottom of the primary separation chamber of the first separation box, avoiding the exhaust pipe from sucking the oil mist into the piston cylinder, thereby improving practicality.

[0012] Preferably, it also includes multiple partition plates 1, multiple guide plates 2 and multiple temperature sensors, the multiple partition plates 1 and the multiple guide plates 2 are alternately installed up and down in the secondary separation chamber of the second separation box, the multiple partition plates 1 and the multiple guide plates 2 are all inclined, the multiple partition plates 1 and the multiple guide plates 2 are parallel, a gap 1 is set between the upper ends of the multiple partition plates 1 and the left inner wall of the second separation box, the input ends of the multiple oil outlet pipes are respectively aligned with the lower ends of the multiple partition plates 1, a gap 2 is set between the lower ends of the multiple guide plates 2 and the right inner wall of the second separation box, a separation compartment is formed between two adjacent partition plates 1, and the probes of the multiple temperature sensors are respectively extended into the bottom of the multiple separation compartments and the secondary separation chamber of the second separation box; the multiple temperature sensors are used for the multiple separation compartments and the second separation The temperature is measured at the bottom of the secondary separation chamber of the box. After the mixed liquid is input into the bottom of the secondary separation chamber of the second separation box, the heater heats the mixed liquid to evaporate and vaporize all the mixed liquid except the elemental white oil with the highest boiling point. The mixed steam enters the first separation compartment through the gap one between the partition one and the second separation box. The guide plate two guides the mixed steam downward to extend the cooling time so that the mixed steam is cooled to below the boiling point of the elemental white oil with the second highest boiling point, so that the elemental white oil with the second highest boiling point is liquefied and discharged through the oil outlet pipe. The remaining mixed steam enters the second separation compartment through the gap one between the partition one at the top of the first separation compartment and the second separation box. Similarly, multiple separation compartments separate multiple elemental white oils in the mixed steam in turn, which has good practicality.

[0013] Preferably, it also includes multiple cooling fillers 1, multiple cooling fillers 2 and multiple medium tubes, the multiple cooling fillers 1 are respectively installed between the multiple partition plates 1 and the multiple guide plates 2, the multiple cooling fillers 2 are respectively installed between the multiple guide plates 2 and the multiple partition plates 1, and the multiple cooling fillers 1 and the multiple cooling fillers 2 are both installed with medium tubes; heat exchange medium is input into the multiple cooling fillers 1 and the multiple cooling fillers 2 through the multiple medium tubes, so that the multiple cooling fillers 1 and the multiple cooling fillers 2 reach different temperatures, so that the multiple separation compartments form multi-stage cooling in sequence from low to high, and different elemental white oils are distilled and separated, which has good practicality.

[0014] Preferably, it also includes a reflux pipe, one end of which is connected to the top of the primary separation chamber of the first separation box, and the other end of the reflux pipe is connected to the top of the secondary separation chamber of the second separation box; the residual mixed steam separated step by step by the second separation box flows back to the primary separation chamber of the first separation box through the reflux pipe, so that the residual mixed steam is separated and circulated again, thereby improving the separation effect.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The primary separation chamber of the first separation box is placed in a low pressure state, thereby reducing the boiling point of dichloromethane, so that the dichloromethane in the mixed liquid oil mist sprayed into the primary separation chamber can be rapidly volatilized at a lower temperature and drawn into the vacuum chamber, thus realizing the dual functions of pressurized feeding and vacuum discharge of the piston mechanism;

[0017] 2. The vapors of the various mixed oils pass through the various separation compartments in sequence. As the temperature of the separation compartments decreases step by step, the vapors of the mixed oils are distilled out in sequence into the elemental white oil with the second highest boiling point, the elemental white oil with the third highest boiling point, etc. The various elemental white oils separated by distillation are respectively input into an external elemental white oil collection device through a plurality of oil outlet pipes, thereby realizing two-stage separation of the mixed liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the axonometric structure of the present invention;

[0021] Figure 4 It is a partial cross-sectional structural schematic diagram of the piston mechanism and the sleeve;

[0022] Figure 5 It is a partial cross-sectional structural schematic diagram of the piston mechanism;

[0023] Figure 6 is a schematic diagram of the structure of the piston assembly;

[0024] Figure 7 It is a schematic diagram of the structure of the drive shaft, bevel gear one, shaft tube two, half gear two and bevel gear two;

[0025] Figure 8 It is a schematic diagram of the structure of the drive shaft, bevel gear one, shaft tube two, half gear two and bevel gear two in an exploded state;

[0026] Fig. 9 It is a front cross-sectional structural diagram of the second separation box, heater, oil outlet pipe and other structures;

[0027] Fig.10 It is a structural schematic diagram of a cooling filler 1, a cooling filler 2, a medium pipe and other structures.

[0028] Markings in the accompanying drawings: 1. piston mechanism; 2. sleeve; 3. nozzle; 4. first separation box; 5. oil pump; 6. second separation box; 7. heater; 8. oil outlet pipe; 9. piston cylinder; 10. piston body; 11. shaft tube; 12. exhaust pipe; 13. one-way valve four; 14. liquid inlet pipe; 15. liquid outlet pipe; 16. ring groove; 17. piston ring; 18. rack; 19. drive shaft; 20. bevel gear one; 21. half gear one; 22. shaft tube two; 23. half gear two; 24. bevel gear two; 25. bevel gear three; 26. slide groove; 27. fin; 28. guide plate one; 29. ​​partition one; 30. guide plate two; 31. temperature sensor; 32. cooling filler one; 33. cooling filler two; 34. medium pipe; 35. return pipe; 36. motor. DETAILED DESCRIPTION

[0029] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] like Figures 1 to 3 As shown, a mineral white oil two-stage separation system includes a first separation box 4, an oil pump 5, a second separation box 6 and a heater 7. A primary separation chamber is arranged inside the first separation box 4, a secondary separation chamber is arranged inside the second separation box 6, the heater 7 is installed at the bottom of the secondary separation chamber of the second separation box 6, the input end and the output end of the oil pump 5 are respectively connected with the primary separation chamber of the first separation box 4 and the secondary separation chamber of the second separation box 6; it also includes a piston mechanism 1, a sleeve 2, a nozzle 3 and a plurality of oil outlet pipes 8, the sleeve 2 is sleeved on the outer wall of the piston mechanism 1, a heating interlayer is arranged between the sleeve 2 and the piston mechanism 1, a piston assembly is arranged inside the piston mechanism 1, and the right side of the piston assembly is an exhaust chamber, the primary separation chamber of the first separation box 4, the exhaust chamber The chamber is unidirectionally connected to the external dichloromethane collection system; the left side of the piston assembly is a pressurized chamber, the external mixed liquid inlet pipe, the pressurized chamber and the heating interlayer are unidirectionally connected, the input end of the nozzle 3 is connected to the heating interlayer, and a plurality of spray heads are arranged at the output end of the nozzle 3, the plurality of spray heads of the nozzle 3 are located at the upper part of the primary separation chamber of the first separation box 4, the secondary separation chamber of the second separation box 6 is provided with a plurality of separation compartments with gradually decreasing temperatures, a plurality of oil outlet pipes 8 are installed on the second separation box 6, and the plurality of oil outlet pipes 8 are respectively connected to the plurality of separation compartments of the second separation box 6; it also includes a reflux pipe 35, one end of the reflux pipe 35 is connected to the top of the primary separation chamber of the first separation box 4, and the other end of the reflux pipe 35 is connected to the top of the secondary separation chamber of the second separation box 6.

[0031] During operation, when the piston assembly moves to the right side of the piston mechanism 1, the mixed liquid of dichloromethane and white oil enters the pressurized chamber of the piston mechanism 1 through the inlet pipe, and at the same time, the piston assembly transports the gas in the vacuum chamber to the external dichloromethane collection system; when the piston assembly moves to the left side of the piston mechanism 1, the piston assembly pressurizes the mixed liquid and inputs it into the heating interlayer between the piston mechanism 1 and the sleeve 2. Since the mixed liquid is pressurized and the piston assembly generates heat due to friction, the temperature of the mixed liquid in the heating interlayer increases. When the mixed liquid in the heating interlayer exceeds the pressure of the pressure limiting valve of the nozzle 3, the mixed liquid is sprayed into the primary separation chamber of the first separation box 4 in the form of oil mist through the multiple spray heads of the nozzle 3. At the same time, the leftward movement of the piston assembly increases the volume of the vacuum chamber, thereby extracting the gas in the primary separation chamber of the first separation box 4, so that the primary separation chamber of the first separation box 4 is in a low-pressure state, thereby reducing the boiling point of dichloromethane, and causing the dichloromethane in the oil mist of the mixed liquid sprayed into the primary separation chamber to evaporate quickly at a lower temperature and be drawn in In the vacuum chamber, the dual functions of pressurized feeding and vacuum discharge of the piston mechanism 1 are realized; after the mixed liquid oil mist is collected at the bottom of the primary separation chamber of the first separation box 4, it is input into the secondary separation chamber of the second separation box 6 through the oil pump 5, and the heater 7 heats the mixed liquid to make the temperature of the mixed liquid reach the boiling temperature of the elemental white oil with the second highest boiling point in the mixed liquid, so that except for the elemental white oil with the highest boiling point remaining at the bottom of the separation chamber of the second separation box 6, the vapors of the other multiple mixed oils pass through multiple separation compartments in sequence. Since the temperature of the separation compartments is gradually reduced, the vapor of the mixed oil is distilled out in sequence after passing through multiple separation compartments to produce the elemental white oil with the second highest boiling point, the elemental white oil with the third highest boiling point..., and the multiple elemental white oils separated by distillation are respectively input into the external elemental white oil collection device through multiple oil outlet pipes 8, and the residual mixed vapor separated step by step by the second separation box 6 is refluxed to the primary separation chamber of the first separation box 4 through the reflux pipe 35, so that the residual mixed vapor is separated and circulated again to improve the separation effect.

[0032] like Figures 4 to 8As shown, on the basis of Example 1, the piston mechanism 1 includes a piston cylinder 9, a piston assembly, an air extraction pipe 12, a one-way valve 13, a liquid inlet pipe 14 and a liquid outlet pipe 15, the piston assembly includes a piston body 10 and a shaft tube 11, the right end of the piston cylinder 9 is provided with an air extraction pipe 12, the air extraction pipe 12 is connected to the middle of the primary separation chamber of the first separation box 4, a one-way valve 1 from the first separation box 4 to the piston cylinder 9 is arranged inside the air extraction pipe 12, the left end of the piston cylinder 9 is provided with a liquid inlet pipe 14 and a liquid outlet pipe 15, a one-way valve 2 from the outside to the piston cylinder 9 is arranged in the liquid inlet pipe 14, and a one-way valve 2 from the outside to the piston cylinder 9 is arranged in the liquid outlet pipe 15. A one-way valve three of the heating interlayer between the piston mechanism 1, the piston body 10 is slidably installed in the piston cylinder 9, the right side of the piston body 10 is a vacuum chamber, the left side of the piston body 10 is a pressurized chamber, a through hole is set in the middle of the piston body 10, the middle of the shaft tube 11 is slidably connected to the left end of the piston cylinder 9, the right end of the shaft tube 11 is concentrically connected to the piston body 10, the shaft tube 11 is connected to the through hole of the piston body 10, a one-way valve four 13 from the piston cylinder 9 to the shaft tube 11 is set in the through hole of the piston body 10, and the outer end of the shaft tube 11 is connected to the external dichloromethane collection system; it also includes a plurality of fins 27, and the plurality of fins 27 are evenly installed around the circumference. On the outer wall of the piston cylinder 9, a plurality of fins 27 are located in the heating interlayer between the piston mechanism 1 and the sleeve 2; it also includes an annular groove 16 and a piston ring 17, the annular groove 16 is circumferentially arranged on the outer wall of the piston body 10, a liquid inlet hole connected to the annular groove 16 is arranged on the left end face of the piston body 10, and the piston ring 17 is arranged in the annular groove 16; it also includes a rack 18, a drive shaft 19, a bevel gear 1 20, a half gear 1 21, a shaft tube 22, a half gear 23, a bevel gear 24, a bevel gear 3 25 and a motor 36, the rack 18 is installed on the outer end of the shaft tube 11, and the output shaft of the motor 36 is drivingly connected to the drive shaft 19 , bevel gear 1 20 is concentrically mounted on the drive shaft 19, half gear 1 21 is mounted on the outer end of the drive shaft 19, half gear 1 21 is meshed with the rack 18, shaft tube 2 22 is coaxially rotatably sleeved on the drive shaft 19, half gear 23 is mounted on the outer end of shaft tube 22, half gear 23 is arranged opposite to half gear 1 21, half gear 23 is meshed with the rack 18, bevel gear 24 is concentrically mounted on the inner end of shaft tube 22, bevel gear 1 20 and bevel gear 2 24 are both meshed with bevel gear 3 25; also includes a slide groove 26, the slide groove 26 is mounted on the bracket of the motor 36, and the shaft tube 11 is slidably connected to the slide groove 26.

[0033] The motor 36 drives the drive shaft 19 to rotate, and the drive shaft 19 drives the bevel gear 1 20 and the half gear 1 21 to rotate clockwise. At the same time, the bevel gear 1 20 drives the bevel gear 2 24 and the shaft tube 2 22 to rotate counterclockwise through the bevel gear 3 25, and the shaft tube 2 22 drives the half gear 2 23 to rotate counterclockwise. Since the half gear 2 23 and the half gear 1 21 are arranged relative to each other, the half gear 1 21 and the half gear 2 23 are alternately meshed with the rack 18. When the half gear 1 21 is meshed with the rack 18, When the shaft tube 11 and the piston body 10 are engaged, the shaft tube 11 and the piston body 10 are pulled to the left. When the half gear 23 is engaged with the rack 18, the shaft tube 11 and the piston body 10 are pushed to the right to realize the large stroke reciprocating movement of the piston body 10. The slide groove 26 slides and limits the shaft tube 11 to improve the stability of the shaft tube 11 when it reciprocates. When the shaft tube 11 drives the piston body 10 to move to the right end of the piston cylinder 9, the mixed liquid enters the pressurized chamber on the left side of the piston cylinder 9 through the liquid inlet pipe 14, and the two in the exhaust chamber are Chloromethane vapor is input into the external methylene chloride collection system through the one-way valve 13 and the shaft tube 11; when the shaft tube 11 drives the piston body 10 to move toward the left end of the piston cylinder 9, the mixed liquid in the pressurized chamber enters the ring groove 16 through the liquid inlet hole, and supports the piston ring 17 outward, so that the piston ring 17 expands outward, thereby filling the gap between the piston body 10 and the piston cylinder 9, improving the sealing effect, and the mixed liquid is pressurized and enters the heating interlayer between the piston mechanism 1 and the sleeve 2 through the liquid outlet pipe 15, and the volume of the vacuum chamber is increased so that the methylene chloride vapor in the primary separation chamber of the first separation box 4 is sucked into the vacuum chamber through the vacuum pipe 12, thereby realizing the pressurized delivery of the mixed liquid and the efficient extraction of methylene chloride and creating a low-pressure environment in the primary separation chamber of the first separation box 4. The piston body 10 and the piston cylinder 9 generate heat due to relative friction, and the heating efficiency of the piston cylinder 9 for the mixed liquid is improved by setting a plurality of fins 27.

[0034] like Figure 1 , Figure 2 , Fig. 9 and Fig.10As shown, on the basis of Example 1, it also includes a guide plate 28, the left end of the guide plate 28 is installed on the left inner wall of the first separation box 4, the guide plate 28 is located between the exhaust pipe 12 and the nozzle 3, and the right end of the guide plate 28 is tilted downward; it also includes multiple partitions 29, multiple guide plates 30 and multiple temperature sensors 31, multiple partitions 29 and multiple guide plates 30 are alternately installed up and down in the secondary separation chamber of the second separation box 6, multiple partitions 29 and multiple guide plates 30 are all inclined, multiple partitions 29 and multiple guide plates 30 are parallel, a gap 1 is set between the upper ends of the multiple partitions 29 and the left inner wall of the second separation box 6, and the input ends of the multiple oil outlet pipes 8 are respectively Aligned with the lower ends of the multiple partitions 29, a gap 2 is set between the lower ends of the multiple guide plates 20 and the right inner wall of the second separation box 6, a separation compartment is formed between two adjacent partitions 29, and the probes of the multiple temperature sensors 31 are respectively extended into the bottom of the multiple separation compartments and the secondary separation chamber of the second separation box 6; it also includes multiple cooling fillers 32, multiple cooling fillers 33 and multiple medium pipes 34, the multiple cooling fillers 32 are respectively installed between the multiple partitions 29 and the multiple guide plates 20, the multiple cooling fillers 33 are respectively installed between the multiple guide plates 20 and the multiple partitions 29, and the multiple cooling fillers 32 and the multiple cooling fillers 23 are installed with medium pipes 34.

[0035] The guide plate 28 blocks the oil mist falling downward and guides the oil mist to the bottom of the primary separation chamber of the first separation box 4 to prevent the exhaust pipe 12 from sucking the oil mist into the piston cylinder 9. The heat exchange medium is input into the multiple cooling fillers 1 32 and the multiple cooling fillers 2 33 through the multiple medium pipes 34, so that the multiple cooling fillers 1 32 and the multiple cooling fillers 2 33 reach different temperatures. The multiple temperature sensors 31 measure the temperature of the multiple separation compartments and the bottom of the secondary separation chamber of the second separation box 6, so that the multiple separation compartments form multi-stage cooling from low to high in sequence, and different elemental white oils are distilled and separated. After the mixed liquid is input into the bottom of the secondary separation chamber of the second separation box 6 The heater 7 heats the mixed liquid to evaporate all the mixed liquid except the elemental white oil with the highest boiling point, and the mixed steam enters the first separation compartment through the gap between the partition 29 and the second separation box 6. The guide plate 30 guides the mixed steam downward to extend the cooling time so that the mixed steam is cooled below the boiling point of the elemental white oil with the second highest boiling point, so that the elemental white oil with the second highest boiling point is liquefied and discharged through the oil outlet pipe 8, and the remaining mixed steam enters the second separation compartment through the gap between the partition 29 at the top of the first separation compartment and the second separation box 6. Similarly, multiple separation compartments separate multiple elemental white oils in the mixed steam in turn.

[0036] like Figures 1 to 10As shown, a mineral white oil two-stage separation system of the present invention, when it is working, first the motor 36 is operated to drive the piston body 10 to move back and forth, when the piston body 10 moves to the right side of the piston mechanism 1, when the shaft tube 11 drives the piston body 10 to move to the right end of the piston cylinder 9, the mixed liquid of dichloromethane and white oil enters the pressurized chamber on the left side of the piston cylinder 9 through the liquid inlet pipe 14, and the dichloromethane vapor in the exhaust chamber is input into the external dichloromethane collection system through the one-way valve 14 and the shaft tube 11; then when the shaft tube 11 drives the piston body 10 to the piston When the left end of the cylinder 9 moves, the mixed liquid is pressurized and enters the heating interlayer between the piston mechanism 1 and the sleeve 2 through the liquid outlet pipe 15, and the mixed liquid is pressurized and input into the heating interlayer between the piston mechanism 1 and the sleeve 2. Since the mixed liquid is pressurized and the piston assembly generates heat by friction, the temperature of the mixed liquid in the heating interlayer increases. When the mixed liquid in the heating interlayer exceeds the pressure of the pressure limiting valve of the nozzle 3, the mixed liquid is sprayed into the primary separation chamber of the first separation box 4 in the form of oil mist through the multiple spray heads of the nozzle 3, and the volume of the vacuum chamber increases to make the first separation chamber The dichloromethane vapor in the primary separation chamber of the first separation box 4 is pumped into the pumping chamber through the pumping pipe 12, and the primary separation chamber of the first separation box 4 is placed in a low pressure state, thereby reducing the boiling point of dichloromethane, so that the dichloromethane in the mixed liquid oil mist sprayed into the primary separation chamber is rapidly volatilized at a lower temperature and pumped into the pumping chamber, and then the mixed liquid oil mist is collected at the bottom of the primary separation chamber of the first separation box 4 and then input into the secondary separation chamber of the second separation box 6 through the oil pump 5, and the heater 7 heats the mixed liquid to make the temperature of the mixed liquid reach the boiling point of the mixed liquid. The boiling temperature of the second highest elemental white oil is reached, so that except for the elemental white oil with the highest boiling point retained at the bottom of the separation chamber of the second separation box 6, the steam of other multiple mixed oils passes through multiple cooling fillers 1 32 and multiple cooling fillers 2 33 in the multiple separation compartments in turn, and the multiple elemental white oils in the mixed steam are separated in turn and discharged through multiple oil outlet pipes 8. Finally, the residual mixed steam separated step by step by the second separation box 6 is refluxed to the primary separation chamber of the first separation box 4 through the reflux pipe 35, so that the residual mixed steam can be separated and circulated again.

[0037] The main functions achieved by the present invention are:

[0038] 1. Use low-pressure distillation to reduce the boiling point of dichloromethane, improve the efficiency of distillation separation, and reduce energy consumption;

[0039] 2. The piston mechanism is used to realize pressurized delivery of the mixed liquid, efficient extraction of dichloromethane and creation of a low-pressure environment in the primary separation chamber of the first separation box 4, with multiple functions;

[0040] 3. The coaxial bidirectional driven piston mechanism is adopted to realize the long-stroke reciprocating movement of the piston assembly;

[0041] 4. Use multiple separation compartments with gradual cooling to carry out multi-stage distillation of white oil.

[0042] The installation mode, connection mode or setting mode of a mineral white oil secondary separation system of the present invention are all common mechanical modes, and any mode that can achieve its beneficial effects can be implemented; the sleeve 2, nozzle 3, first separation box 4, oil pump 5, second separation box 6, heater 7, oil outlet pipe 8, piston cylinder 9, piston body 10, shaft tube 11, one-way valve 1, one-way valve 2, one-way valve 3, one-way valve 4 13, piston ring 17, rack 18, motor 36, drive shaft 19, bevel gear 1 20, half gear 1 21, shaft tube 22, half gear 23, bevel gear 2 24, bevel gear 3 25, slide 26, fin 27, temperature sensor 31, cooling filler 1 32, cooling filler 2 33 of a mineral white oil secondary separation system of the present invention are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technicians in this field to make creative labor.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A mineral white oil two-stage separation system, comprising a first separation box (4), an oil pump (5), a second separation box (6) and a heater (7), wherein a primary separation chamber is arranged inside the first separation box (4), a secondary separation chamber is arranged inside the second separation box (6), the heater (7) is installed at the bottom of the secondary separation chamber of the second separation box (6), and an input end and an output end of the oil pump (5) are respectively connected to the primary separation chamber of the first separation box (4) and the secondary separation chamber of the second separation box (6); characterized in that: It also comprises a piston mechanism (1), a sleeve (2), a nozzle (3) and a plurality of oil outlet pipes (8), wherein the sleeve (2) is sleeved on the outer wall of the piston mechanism (1), a heating interlayer is arranged between the sleeve (2) and the piston mechanism (1), a piston assembly is arranged inside the piston mechanism (1), the right side of the piston assembly is a vacuum chamber, the primary separation chamber of the first separation box (4), the vacuum chamber and the external dichloromethane collection system are in one-way communication; the left side of the piston assembly is a pressurizing chamber, the external mixed liquid inlet pipe, the pressurizing chamber and the heating interlayer are in one-way communication, the input end of the nozzle (3) is in communication with the heating interlayer, a plurality of spray heads are arranged at the output end of the nozzle (3), the plurality of spray heads of the nozzle (3) are located at the upper part of the primary separation chamber of the first separation box (4), the secondary separation chamber of the second separation box (6) is provided with a plurality of separation compartments with gradually decreasing temperatures, a plurality of oil outlet pipes (8) are installed on the second separation box (6), and the plurality of oil outlet pipes (8) are respectively in communication with the plurality of separation compartments of the second separation box (6).

2. A mineral white oil secondary separation system as claimed in claim 1, characterized in that: The piston mechanism (1) comprises a piston cylinder (9), a piston assembly, an air extraction pipe (12), a one-way valve (4) (13), a liquid inlet pipe (14) and a liquid outlet pipe (15). The piston assembly comprises a piston body (10) and a shaft tube (11). The right end of the piston cylinder (9) is provided with an air extraction pipe (12). The air extraction pipe (12) is communicated with the middle of the primary separation chamber of the first separation box (4). A one-way valve (1) from the first separation box (4) to the piston cylinder (9) is provided inside the air extraction pipe (12). The left end of the piston cylinder (9) is provided with an air extraction pipe (14) and a liquid outlet pipe (15). A one-way valve (2) from the outside to the piston cylinder (9) is provided in the liquid inlet pipe (14). A one-way valve (3) from the outside to the piston cylinder (9) is provided in the liquid outlet pipe (15). The cylinder (9) is provided with a one-way valve (3) for heating the interlayer between the sleeve (2) and the piston mechanism (1); the piston body (10) is slidably mounted in the piston cylinder (9); the right side of the piston body (10) is a vacuum chamber; the left side of the piston body (10) is a pressurizing chamber; a through hole is arranged in the middle of the piston body (10); the middle of the shaft tube (11) is slidably connected to the left end of the piston cylinder (9); the right end of the shaft tube (11) is concentrically connected to the piston body (10); the shaft tube (11) is connected to the through hole of the piston body (10); a one-way valve (4) (13) is arranged in the through hole of the piston body (10) from the piston cylinder (9) to the shaft tube (11); and the outer end of the shaft tube (11) is connected to an externally connected dichloromethane collection system.

3. A mineral white oil secondary separation system as claimed in claim 2, characterized in that: It also includes a plurality of fins (27), the plurality of fins (27) being evenly mounted on the outer wall of the piston cylinder (9) at a circumference, and the plurality of fins (27) being located in the heating interlayer between the piston mechanism (1) and the sleeve (2).

4. A mineral white oil secondary separation system as claimed in claim 2, characterized in that: It also comprises an annular groove (16) and a piston ring (17). The annular groove (16) is circumferentially arranged on the outer wall of the piston body (10). A liquid inlet hole communicating with the annular groove (16) is arranged on the left end surface of the piston body (10). The piston ring (17) is arranged in the annular groove (16).

5. A mineral white oil secondary separation system as claimed in claim 2, characterized in that: The invention also comprises a rack (18), a drive shaft (19), a bevel gear 1 (20), a half gear 1 (21), a shaft tube 2 (22), a half gear 2 (23), a bevel gear 2 (24), a bevel gear 3 (25) and a motor (36), wherein the rack (18) is mounted on the outer end of the shaft tube (11), the output shaft of the motor (36) is transmission-connected with the drive shaft (19), the bevel gear 1 (20) is concentrically mounted on the drive shaft (19), and the half gear 1 (21) is mounted on the drive shaft (19). ), a half gear 1 (21) meshes with a rack (18), a shaft tube 2 (22) is coaxially rotatably sleeved on a drive shaft (19), a half gear 2 (23) is mounted on the outer end of the shaft tube 2 (22), the half gear 2 (23) is arranged opposite to the half gear 1 (21), the half gear 2 (23) meshes with the rack (18), a bevel gear 2 (24) is coaxially mounted on the inner end of the shaft tube 2 (22), and the bevel gear 1 (20) and the bevel gear 2 (24) are both meshed with a bevel gear 3 (25).

6. A mineral white oil secondary separation system as claimed in claim 2, characterized in that: It also includes a slide groove (26), which is installed on a bracket of the motor (36), and the shaft tube (11) is slidably connected to the slide groove (26).

7. A mineral white oil secondary separation system as claimed in claim 2, characterized in that: It also includes a guide plate 1 (28), the left end of which is mounted on the left inner wall of the first separation box (4), the guide plate 1 (28) is located between the exhaust pipe (12) and the nozzle (3), and the right end of the guide plate 1 (28) is tilted downward.

8. A mineral white oil secondary separation system as claimed in claim 1, characterized in that: It also includes a plurality of partition plates (29), a plurality of guide plates (30) and a plurality of temperature sensors (31). The plurality of partition plates (29) and the plurality of guide plates (30) are alternately installed up and down in the secondary separation chamber of the second separation box (6). The plurality of partition plates (29) and the plurality of guide plates (30) are all arranged at an angle. The plurality of partition plates (29) and the plurality of guide plates (30) are parallel. A gap (1) is arranged between the upper ends of the plurality of partition plates (29) and the left inner wall of the second separation box (6). The input ends of the plurality of oil outlet pipes (8) are respectively aligned with the lower ends of the plurality of partition plates (29). A gap (2) is arranged between the lower ends of the plurality of guide plates (30) and the right inner wall of the second separation box (6). A separation compartment is formed between two adjacent partition plates (29). The probes of the plurality of temperature sensors (31) extend into the bottoms of the plurality of separation compartments and the secondary separation chamber of the second separation box (6).

9. A mineral white oil secondary separation system as claimed in claim 8, characterized in that: It also includes a plurality of cooling fillers one (32), a plurality of cooling fillers two (33) and a plurality of medium pipes (34), wherein the plurality of cooling fillers one (32) are respectively installed between the plurality of partition plates one (29) and the plurality of guide plates two (30), the plurality of cooling fillers two (33) are respectively installed between the plurality of guide plates two (30) and the plurality of partition plates one (29), and the medium pipes (34) are installed on the plurality of cooling fillers one (32) and the plurality of cooling fillers two (33).

10. A mineral white oil secondary separation system as claimed in claim 1, characterized in that: It also includes a reflux pipe (35), one end of which is connected to the top of the primary separation chamber of the first separation box (4), and the other end of which is connected to the top of the secondary separation chamber of the second separation box (6).

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