Integrated Equipment for Purification and Repair of Industrial Lubricating Oil

Abstract

The invention discloses an integrated device for purification and repair of industrial lubricating oil in use, the process comprises the steps of preheating, high-speed centrifugal separation, polymer organic membrane coalescence dehydration filtration, primary electric adsorption separation, dispersed vacuum dehydration, secondary electric adsorption separation, secondary electric adsorption separation and the like; the device comprises a primary heater, a feed oil pump, a centrifuge, and a centrifuge receiving oil tank; the outlet end of the centrifuge receiving oil tank is connected to the polymer organic membrane coalescence dehydration filter, the polymer organic membrane coalescence dehydration filter is connected to the first electric separation device, an electrostatic generator and a controller are arranged in the first electric separation device, a respirator is arranged on the top, and a high and low liquid level controller is arranged; the advantages of the invention are: through pure physical processing, the functional additives of the lubricating oil are not lost, and a skid-mounted combined integration mode is adopted, which is convenient for users to use at customer sites with many locations and wide coverage, and the purification, repair and life extension treatment of the used waste lubricating oil is realized and the direct use is achieved, thereby improving the economic benefits.

Description

Technical Field

[0001] The invention relates to a process for treating industrial lubricating oil in use, in particular to a process and device for purifying and repairing industrial waste lubricating oil in use, belonging to the field of industrial waste lubricating oil treatment process. Background Art

[0002] The purification, repair and harmless treatment of industrial waste lubricating oil has always been a hot topic in the industry. However, the existing treatment technologies in this industry are mostly flocculation separation, oxidation decolorization, acid-base washing, clay adsorption refining and vacuum distillation, which are mostly treatment methods involving strong acids, strong bases and chemical solvents. These processes will not only produce more difficult to treat secondary hazardous wastes, but will also inevitably cause the loss or even removal of functional additives in the lubricating oil, turning the model lubricating oil products with specific functions into lubricating oil base oils, making it difficult to use the waste lubricating oil directly after life extension treatment, resulting in huge economic losses. Summary of the invention

[0003] In order to solve the above problems, the present invention designs a process and device for purifying and repairing industrial waste lubricating oil. The process adopts a purely physical method, and the functional additives of the lubricating oil are not lost. The device adopts a skid-mounted combination and integration mode, which is convenient for users to use at customer sites with many points and wide coverage. The process device can be processed online or offline. The waste lubricating oil in use can be directly used after purification, repair and life extension treatment, which improves economic benefits.

[0004] The technical solution of the present invention is:

[0005] The purification and repair process of industrial waste lubricating oil includes the following steps:

[0006] (1) Preheating: The raw material is heated to 55-60°C in one stage to reduce the kinematic viscosity and facilitate subsequent processing; specifically, the raw material oil pump is turned on to heat the raw material oil to 55-60°C through the heater, and the heating temperature is automatically controlled by the temperature controller;

[0007] (2) High-speed centrifugal separation: Use a centrifuge to remove particles with a particle size greater than 30 μm. The centrifuge should have a speed greater than 4500 r / min, a separation factor Fr greater than 3500, and a centrifugal acceleration greater than 3000 g. The separated crude oil is transported to the next-level polymer organic membrane coalescence dehydration filtration module.

[0008] (3) Polymer organic membrane coalescence dehydration filtration: Particles larger than 15 μm and some water are removed through the polymer organic membrane; the oil after membrane filtration is transported to the primary electric adsorption separation module;

[0009] (4) Primary electrosorption separation: removal of metal debris particles; specifically, the upper-stage raw material is sent to the primary electrosorption separation, with a voltage of 1000-1200V and a current of 10-15mA to remove metal debris particles, and the oil after the primary electrosorption separation is sent to the distributed vacuum dehydration module;

[0010] (5) Dispersed vacuum dehydration: After the second stage, it is heated to 60~65℃ and enters the distributed vacuum dehydration process through the feed pump. The feed liquid level and vacuum degree are controlled by the float valve at -0.08~-0.098MPa, and the dehydration is reduced to 60~120mg / kg. After the solenoid valve of the circulation pump is switched, it is filtered in stages and sent to the second stage electric adsorption separation module;

[0011] (6) Secondary electrosorption separation: remove some asphaltene and oxidized particles; specifically, the crude oil after the previous stage of distributed vacuum dehydration and cascade filtration is sent to the secondary electrosorption separation module, with a voltage of 1400-1500V and a current of 15-20mA to remove some asphaltene and oxidized particles;

[0012] (7) Precision filtration: Filter out particles with a diameter greater than 5 μm and some residual water. Specifically, the crude oil from which some asphaltene and oxidized particles are removed by secondary electrosorption separation is pumped under pressure to a precision filter with a hydrophilic wood pulp fiber filter element to filter out particles with a diameter greater than 5 μm and some residual water.

[0013] A device for purifying, repairing and collecting the above-mentioned industrial waste lubricating oil, comprising a primary heater, a feed oil pump, a centrifuge, and a centrifuge receiving oil tank, wherein the primary heater is connected to the feed oil pump, the feed oil pump is connected to the centrifuge, the primary heater is provided with a temperature controller, the raw oil pump is turned on to heat the raw oil to be processed to 55-60°C through the heater, and the heating temperature is automatically controlled by the temperature controller; the outlet end of the centrifuge receiving oil tank is connected to a polymer organic membrane coalescence dehydration filter, the polymer organic membrane coalescence dehydration filter is connected to a first electric separation device, the first electric separation device is provided with an electrostatic generator and a controller, a respirator is provided on the top, and a high and low liquid level controller is provided; the outlet end of the first electric separation device is heated to 60-65°C by a secondary heater and connected to a distributed vacuum dehydration tower, the distributed vacuum dehydration tower is connected to a second electric separation device after step filtration, the second electric separation device has the same structure as the first electric separation device, and the outlet end of the second electric separation device is connected to a precision filtration device.

[0014] Furthermore, the centrifuge feed oil pump is connected to the oil inlet valve through the oil inlet filter, the oil inlet valve is connected to the centrifuge, and the raw oil to be processed is heated to 55-60°C by the heater, and the heating temperature is automatically controlled by the temperature controller. The outlet end of the centrifuge feed oil pump is connected to the centrifuge receiving oil tank and the centrifuge through the regulating valve to control the feed pressure.

[0015] Furthermore, the bottom of the centrifuge receiving oil tank is connected to the centrifuge oil discharge pump, and a regulating valve is provided between the centrifuge oil discharge pump and the centrifuge receiving oil tank to adjust the pressure of the pump to the next module. The centrifuge speed is selected to be greater than 4500r / min, the separation factor Fr is greater than 3500, and the centrifugal acceleration is greater than 3000g; the particles with a particle size greater than 30μm are separated, and the separated raw oil is transported to the next-level polymer organic membrane coalescence dehydration filter module.

[0016] Furthermore, a drain valve is provided at the bottom of the polymer organic membrane coalescence dehydration filter, and the upper part is connected to the first electrical separation device through a one-way valve and is provided with a backwashing interface.

[0017] Furthermore, the first electrical separation device is connected to the distributed vacuum dehydration tower via a distributed vacuum dehydration feed pump.

[0018] Furthermore, the distributed vacuum dehydration tower is provided with a float valve to control the feed liquid level, an atomization zone is provided at the top, and a distributed fixed bed is provided in the middle to increase the evaporation area and enhance the dehydration effect. Water is discharged from the top through a vacuum pump and a condenser; the atomization zone is connected to the bottom of the distributed vacuum dehydration tower through a circulating pump, and is provided with a secondary heater. The heater is provided with a temperature controller to prevent secondary oxidation caused by excessive temperature. The secondary heater is heated to 60~65°C and sprayed into the distributed vacuum dehydration device through a circulating pump. The vacuum degree is -0.08~-0.098MPa, and the dehydration is to 60~120mg / kg. After cascade filtration, it is connected to the second electrical separation device.

[0019] Furthermore, the crude oil after the cascade filtration in the previous stage of distributed vacuum dehydration is sent to the secondary electric adsorption separation module, with a voltage of 1400-1500V and a current of 15-20mA to remove part of the asphaltene and oxidized particles.

[0020] Furthermore, the second electrical separation device has the same structure as the first electrical separation device, and the outlet end of the second electrical separation device is connected to the precision filtering device.

[0021] Furthermore, the precision filtration: filters particles with a diameter greater than 5μm and some residual moisture; specifically, it is pumped by a pressure pump to a hydrophilic wood pulp fiber filter element precision filter to filter particles with a diameter greater than 5μm and some residual moisture, and a sampling port is set.

[0022] This device uses a skid-mounted combination integration method, which is convenient for users to use at customer sites with many locations. The overall device can be set up for automatic control or manual control for convenient production. Hard pipe welding, quick connectors and flange connections are used between modules to ensure safe production and facilitate inspection and maintenance.

[0023] The advantages of the present invention are: through pure physical processing, the functional additives of the lubricating oil are not lost, the device adopts a skid-mounted combined integration mode, which is convenient for users to use at customer sites in many places and wide areas, and realizes the direct use of the used lubricating oil after purification, repair and life extension treatment, thereby improving economic benefits.

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A simplified process flow diagram of an embodiment of the present invention;

[0026] Figure 2 Detailed diagram of the device structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. Example

[0028] For example: to treat the No. 46 turbine oil in use: cleanliness is greater than level 12 (NAS-1638), water content is 310mg / kg, acidity is 0.08mgKOH / g, iron is greater than 6 mg / Kg. The following steps are included:

[0029] 1. Preheating: Heat the raw materials to 58°C.

[0030] 2. High-speed centrifugal separation: The centrifuge speed is greater than 4500r / min, the separation factor Fr is greater than 3500, the centrifugal acceleration is greater than 3000g, and the particles with a particle size greater than 30μm are removed.

[0031] 3. Polymer organic membrane filtration: Polymer organic membrane coalescence dehydration filter is used to remove particulate pollutants with a particle size of more than 15μm and some water.

[0032] 4. Primary electrical separation: Primary electrical adsorption separation (voltage 1100V, current 12mA), focusing on removing metal debris particles.

[0033] 5. Distributed vacuum dehydration: The second stage is heated to 63°C and enters the distributed vacuum dehydration process section. The feed pump circulates for 5 minutes to dehydrate to 110 mg / kg.

[0034] 6. Secondary electrical separation: Secondary electrical adsorption separation (voltage 1400V, current 16 mA) to remove some asphaltene and oxidized particles.

[0035] 7. Precision filtration: The water is pumped to the hydrophilic wood pulp fiber filter element precision filter to filter out particles with a diameter greater than 5μm and some residual water.

[0036] The final product obtained: cleanliness: less than grade 8 (NAS-1638), moisture content 96 mg / kg, acidity 0.06 mgKOH / g, iron content: less than 4 mg / Kg.

[0037] like Figure 1 As shown, an integrated device for the purification and repair process of the above-mentioned industrial waste in-use lubricating oil comprises a primary heater, a feed oil pump, a centrifuge, and a centrifuge receiving oil tank. The primary heater is connected to the raw oil pump, and the heater is provided with a temperature controller to prevent secondary oxidation caused by excessive temperature. The raw oil pump is turned on to heat the raw oil to be processed to 55-60°C through the heater, and the heating temperature is automatically controlled by the temperature controller; the outlet end of the centrifuge is connected to the polymer organic membrane coalescence dehydration filter, and the outlet end of the membrane filter is connected to the first electric separation device, in which an electrostatic generator and a controller are provided, and a respirator is provided on the top; the outlet end of the first electric separation device is connected to a distributed vacuum dehydration tower through a secondary heater, and the outlet end of the distributed vacuum dehydration tower is connected to a second electric separation device, the second electric separation device has the same structure as the first electric separation device, and the outlet end of the second electric separation device is connected to a precision filtration device.

[0038] like Figure 2 As shown, the specific structure is as follows: the centrifuge receiving oil tank 7 is connected to the oil inlet valve 1 through the oil inlet filter 2, the centrifuge receiving oil tank 7 is connected in parallel with the inlet end of the centrifuge oil inlet pump 3 through the first switching valve 5, and the first heater 4 is provided with a temperature controller. The outlet end of the centrifuge oil inlet pump 3 is connected in parallel with the centrifuge receiving oil tank 7 through the regulating valve and the centrifugal filter 6.

[0039] The bottom of the centrifuge receiving oil tank 7 is also connected in parallel with the centrifuge oil discharge pump 9, a second switching valve 8 is provided between the centrifuge oil discharge pump 9 and the bottom outlet of the centrifuge receiving oil tank 7, and a regulating valve is provided between the centrifuge oil discharge pump 9 and the upper part of the centrifuge receiving oil tank 7.

[0040] The centrifuge oil discharge pump 9 is also connected to the polymer organic membrane coalescence dehydration filter 11 through the third switching valve 10. The polymer organic membrane coalescence dehydration filter 11 is provided with a drain valve at the bottom, and is connected to the first electric separation device 12 at the top through a one-way valve. The first electric separation device 12 is provided with an electrostatic generator 121, and a respirator 122 is provided at the top. The outlet end of the first electric separation device 12 is also connected to the distributed vacuum dehydration tower 18 through the first filter 16, and is provided with a fourth switching valve 13. The outlet end of the first electric separation device 12 is also connected to the inlet end of the centrifuge oil discharge pump 9 through the fifth switching valve 14 and the sixth switching valve 15. , to carry out secondary circulation treatment to improve the treatment effect; a float valve 181 is provided at the inlet end of the distributed vacuum dehydration tower 18, a distributed fixed bed 182 is provided in the middle of the distributed vacuum dehydration tower 18, an atomization zone 184 is provided at the top, and the top is connected to the vacuum pump 22 through the first condenser 20 and the second condenser 21; the distributed vacuum dehydration tower 18 is also provided with an inflation valve 183; the bottom of the distributed vacuum dehydration tower 18 is connected to the atomization zone 184 through a circulating pump 19, and is provided with a second heater 17, the second heater 17 is provided with a temperature controller, and the bottom outlet end of the distributed vacuum dehydration tower 18 is provided with a second filter 185.

[0041] The outlet end of the distributed vacuum dehydration tower 18 is provided with a clamped one-way valve 24, a first step filter 25, a seventh switching valve 26, a second step filter 27, and a third step filter 29 in sequence through an oil discharge pump 23. The outlet end of the third step filter 29 is also connected to a sampling valve 30 and an eighth switching valve 31; the ninth switching valve 32 is connected to a second electric separation device 33, and the second electric separation device 33 has the same structure as the first electric separation device 12.

[0042] The outlet end of the second electric separation device 33 is connected in parallel with the first precision filter 34 and the second precision filter 35 respectively, and the raw oil separated by secondary electric adsorption is sent to the precision filter containing the hydrophilic wood pulp fiber filter element through a pressure pump.

Claims

1. The purification and repair process of industrial waste lubricating oil includes the following steps: (1) Preheating: Turn on the crude oil pump to heat the crude oil to be processed to 55~60℃ through the heater, and automatically control the heating temperature through the temperature controller; (2) High-speed centrifugal separation: Use a centrifuge to remove particles with a particle size greater than 30 μm. The centrifuge should have a speed greater than 4500 r / min, a separation factor Fr greater than 3500, and a centrifugal acceleration greater than 3000 g. The separated crude oil is transported to the next-level polymer organic membrane coalescence dehydration filtration module. (3) Polymer organic membrane coalescence dehydration filtration: Particles larger than 15 μm and some water are removed through the polymer organic membrane; the oil after membrane filtration is transported to the primary electric adsorption separation module; (4) Primary electrosorption separation: The raw materials from the previous stage are sent to the primary electrosorption separation, with a voltage of 1000-1200V and a current of 10-15mA to remove metal debris particles; (5) Dispersed vacuum dehydration: After the second stage, it is heated to 60~65℃ and enters the distributed vacuum dehydration process through the feed pump. The feed liquid level and vacuum degree are controlled by the float valve at -0.08~-0.098MPa. It is dehydrated to 60~120mg / kg and sent to the second stage electric adsorption separation module after the solenoid valve of the circulation pump is switched and filtered by stages. (6) Secondary electro-adsorption separation: The crude oil after the previous stage of distributed vacuum dehydration and cascade filtration is sent to the secondary electro-adsorption separation module with a voltage of 1400-1500 V and a current of 15-20 mA to remove some asphaltene and oxidized particles; (7) Precision filtration: The crude oil from which some asphaltene and oxidized particles are removed by secondary electrosorption separation is pumped under pressure to a precision filter containing a hydrophilic wood pulp fiber filter element to filter out particles with a diameter greater than 5 μm and some residual water.

2. A device for the purification and repair process of industrial waste lubricating oil according to claim 1, characterized in that: It includes a primary heater, a feed oil pump, a centrifuge, and a centrifuge receiving oil tank, wherein the primary heater is connected to the feed oil pump, which is connected to the centrifuge, and the primary heater is provided with a temperature controller; the outlet end of the centrifuge receiving oil tank is connected to a polymer organic membrane coalescence dehydration filter, which is connected to a first electric separation device, in which an electrostatic generator and a controller are provided, a respirator is provided on the top, and a high and low liquid level controller is provided; the outlet end of the first electric separation device is heated to 60-65°C by a secondary heater and connected to a distributed vacuum dehydration tower, which is connected to a second electric separation device after step filtration, and the second electric separation device has the same structure as the first electric separation device, and the outlet end of the second electric separation device is connected to a precision filtration device; The distributed vacuum dehydration tower is provided with a float valve to control the feed liquid level, an atomization zone is provided at the top, and a distributed fixed bed is provided in the middle to increase the evaporation area and enhance the dehydration effect. The water is discharged from the top through a vacuum pump and a condenser; the atomization zone is connected to the bottom of the distributed vacuum dehydration tower through a circulating pump, and is provided with a secondary heater. The secondary heater is provided with a temperature controller to prevent secondary oxidation caused by excessive temperature. The secondary heater is heated to 60-65°C and sprayed into the distributed vacuum dehydration device through a circulating pump. The vacuum degree is -0.08 to -0.098MPa, and the water is dehydrated to 60-120mg / kg. After cascade filtration, it is connected to the second electrical separation device; it is pumped to a hydrophilic wood pulp fiber filter element precision filter through a pressure pump to filter particles with a particle size greater than 5μm and some residual water, and a sampling port is provided.

3. The device according to claim 2, characterized in that: The feed oil pump is connected to the oil inlet valve through an oil inlet filter, and the feed oil pump is connected to a centrifuge, and the raw oil to be processed is heated to 55-60°C through a primary heater, and the heating temperature is automatically controlled by a temperature controller; the outlet end of the feed oil pump is connected to the centrifuge receiving oil tank and the centrifuge through a regulating valve to control the feed pressure.

4. The device according to claim 2, characterized in that: The bottom of the centrifuge receiving oil tank is connected to the centrifuge oil discharge pump, and a regulating valve is provided between the centrifuge oil discharge pump and the centrifuge receiving oil tank to adjust the pressure pumped to the next module; the rotation speed of the centrifuge is greater than 4500r / min, the separation factor Fr is greater than 3500, and the centrifugal acceleration is greater than 3000g; and particles with a particle size greater than 30μm are separated.

5. The device according to claim 2, characterized in that: The bottom of the polymer organic membrane coalescence dehydration filter is provided with a drain valve, the upper part is connected to the first electrical separation device through a one-way valve, and is provided with a backwashing interface.

6. The device according to claim 2, characterized in that: The first electrical separation device is connected to the distributed vacuum dehydration tower via a distributed vacuum dehydration feed pump.

7. The device according to claim 2, characterized in that: After the crude oil from the previous stage of distributed vacuum dehydration and cascade filtration is sent to the secondary electric adsorption separation module, the voltage is 1400-1500V and the current is 15-20mA to remove part of the asphaltene and oxidized particles.

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