CN109749840B - Energy-saving process for refining regenerated base oil and diesel oil from waste mineral oil - Google Patents
Energy-saving process for refining regenerated base oil and diesel oil from waste mineral oil Download PDFInfo
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Abstract
The process for refining regenerated base oil and diesel oil from waste mineral oil is characterized by that on one hand, the heat quantity of refining cooling condensation can be recovered by means of several heat exchanges, and on the other hand, the negative pressure distillation and condensation environment is provided, so that the oil product can be gasified and liquefied at boiling point and condensation point with lower temp., and the basic energy source requirement for heating can be reduced.
Description
Technical Field
The invention relates to the technical field of recycling of waste and recovered mineral oil, in particular to a process for refining regenerated base oil and diesel oil from waste and recovered mineral oil in an energy-saving manner.
Background
At present, the amount of waste mineral oil produced in China in machinery manufacturing and transportation industry can reach 3000-. In the face of such huge waste mineral oil, the recovery rate of China is low at present, and is only about 20% -30%. Most of the waste mineral oil is generally poured as waste, and the waste mineral oil contains various oils, so that the waste mineral oil is treated as waste to cause resource waste and environmental pollution; the waste mineral oil can also be used as fuel, but the waste mineral oil contains various miscellaneous oils, water, dust, scrap iron and the like, so that the heat generated by burning the waste mineral oil is less, and a large amount of dense smoke can be generated, thereby polluting the environment and being harmful to the health of human bodies. Along with the improvement of the living standard of people in recent years, the energy demand is more and more intense, and the waste mineral oil is recycled and refined into combustion oil more and more, so that partial pollution problem is solved to a certain extent, and the problems that the heating mode in the existing refining equipment is simple, the energy cannot be fully utilized, and the refining cost is high are caused. On the other hand, due to the existence of the impurities, residual oil formed after refining is accumulated in the refining tank to a certain degree, and the refining tank needs to be shut down for cleaning, so that the production efficiency is also influenced.
Disclosure of Invention
In order to solve the problems, the invention provides an energy-saving process for refining regenerated base oil and diesel oil from waste mineral oil.
The technical scheme of the invention is as follows: a process for refining regenerated base oil and diesel oil from energy-saving waste mineral oil is realized by adopting complete equipment for refining regenerated base oil and diesel oil from negative-pressure energy-saving waste mineral oil, wherein the complete equipment comprises an electromagnetic induction heating tank, a base oil condensing heat exchanger, a base oil collecting heat exchanger, a first negative-pressure diesel oil condensing heat exchanger, a second negative-pressure diesel oil condensing heat exchanger, a waste mineral oil supply tower, a residual oil collecting container and a negative-pressure pump;
the base oil condensing heat exchanger, the base oil collecting heat exchanger, the first negative pressure diesel condensing heat exchanger and the second negative pressure diesel condensing heat exchanger are all tubular heat exchangers with the same structure, and each tubular heat exchanger comprises a cold medium channel and a hot medium channel which are not communicated but exchange heat through heat pipes;
the external part of the base oil collecting heat exchanger is provided with a spiral coil pipe tightly attached to the outer wall of the base oil collecting heat exchanger, the external part of the spiral coil pipe is covered with a heat insulation material, the lower part of the waste mineral oil supply tower is communicated to the inlet of the spiral coil pipe through a pipeline, and the outlet of the spiral coil pipe is communicated to the inlet of a cold medium channel of the first negative pressure diesel oil condensing heat exchanger;
an outlet of a cold medium channel of the first negative pressure diesel oil condensing heat exchanger is communicated with an inlet of a cold medium channel of the base oil condensing heat exchanger through a pipeline;
an outlet of a cold medium channel of the base oil condensing heat exchanger is communicated to an oil inlet of the electromagnetic induction heating tank through a pipeline, the oil inlet of the electromagnetic induction heating tank is positioned at the upper part of a tank body of the electromagnetic induction heating tank, a slag discharging port is arranged at the lower part of the electromagnetic induction heating tank, and the slag discharging port is communicated to the bottom of a residual oil collecting container through a pipeline; the uppermost end of the electromagnetic induction heating tank is provided with a gaseous oil outlet;
an upper interface, a middle interface and a lower interface are sequentially arranged on a heat medium channel of the base oil condensation heat exchanger from top to bottom, and a gaseous oil outlet of the electromagnetic induction heating tank is communicated to the middle interface on the heat medium channel of the base oil condensation heat exchanger through a pipeline;
the lower interface on the hot medium channel of the base oil condensing heat exchanger is connected to the hot medium channel of the base oil collecting heat exchanger through a pipeline, one end of the inlet of the cold medium channel of the base oil collecting heat exchanger is connected to a water source, and the outlet of the cold medium channel of the base oil collecting heat exchanger is communicated to a warm water collecting drain pipe;
an upper interface on a heat medium channel of the base oil condensing heat exchanger is connected to a heat medium inlet of a first negative pressure diesel condensing heat exchanger through a pipeline, a diesel steam outlet is formed in the upper portion of the first negative pressure diesel condensing heat exchanger and communicated with a heat medium inlet in the upper portion of a second negative pressure diesel condensing heat exchanger through a pipeline, and a diesel outlet is formed in the lower portion of the first negative pressure diesel condensing heat exchanger and communicated to a diesel collecting container through a pipeline;
a hot medium outlet at the bottom of the second negative pressure diesel oil condensing heat exchanger is communicated to a diesel oil collecting container through a pipeline, a cold medium inlet of the second negative pressure diesel oil condensing heat exchanger is connected with a water source, a cold medium outlet of the second negative pressure diesel oil condensing heat exchanger is communicated to a warm water collecting drain pipe, the top of a hot medium channel of the second negative pressure diesel oil condensing heat exchanger is communicated to a negative pressure device through a negative pressure pipe, and the negative pressure device is also communicated to the top of a residual oil collecting container through a pipeline;
the bottom of the heat medium channel of the base oil collecting heat exchanger is provided with an oil discharge pipe which is used for connecting a base oil container; the negative pressure device comprises two negative pressure pumps connected in series; the electromagnetic induction heating tank body is a steel tank, an electromagnetic induction coil is wound outside the tank body, and the electromagnetic induction coil is connected to an electromagnetic induction heating power supply; and each pipeline is provided with an electromagnetic valve for on-off control.
The process comprises the following steps:
a. preheating waste mineral oil to 40-60 deg.C
The waste mineral oil flows out of a waste mineral oil supply tower and then enters a spiral coil on the outer wall of a base oil collecting heat exchanger through a pipeline to be preheated, and the base oil collected in the base oil collecting heat exchanger heats the waste mineral oil to 40-60 ℃;
b. preheating waste mineral oil to 100 deg.C
The preheated waste mineral oil in the step a enters a cold medium channel of a first negative pressure diesel oil condensation heat exchanger through a pipeline, exchanges heat with gaseous diesel oil and is preheated to 100 ℃;
c. preheating the waste mineral oil to the temperature of 180℃ and 200 DEG C
The preheated waste mineral oil in the step b enters a cold medium channel of the base oil condensation heat exchanger through a pipeline, exchanges heat with the mixture of the gaseous diesel oil and the gaseous base oil, and is preheated to 180-200 ℃;
d. boiling and evaporating waste mineral oil into mixture of gaseous diesel oil and gaseous base oil
The preheated waste mineral oil in the step c enters the electromagnetic induction heating tank through a pipeline, is heated to 350 ℃ for 300 ℃, and is boiled and evaporated into a mixture of gaseous diesel oil and gaseous base oil;
e. condensing and collecting base oil
D, enabling the mixture of the gaseous diesel oil and the gaseous base oil in the step d to enter a base oil condensation heat exchanger from an electromagnetic induction heating tank through a pipeline to perform heat exchange with the waste mineral oil generated in the step b to cool to 180-200 ℃, condensing the base oil in the mixture of the gaseous diesel oil and the gaseous base oil into liquid base oil, enabling the liquid base oil to flow into a heat medium channel of a base oil collection heat exchanger through the pipeline to perform heat exchange with cold water passing through the base oil collection heat exchanger and the waste mineral oil from a waste mineral oil supply tower to cool to 40-60 ℃ simultaneously;
f.100 deg.C high-temp. negative pressure diesel oil condensation collection
The gaseous diesel oil in the step e enters the first negative pressure diesel oil condensing heat exchanger from the base oil condensing heat exchanger through a pipeline, exchanges heat with the waste mineral oil at the temperature of 40-60 ℃ preheated in the step a, is cooled to 100 ℃, is condensed into liquid diesel oil, and the liquid diesel oil formed is discharged from a pipeline at the lower part of a heat medium channel of the first negative pressure diesel oil condensing heat exchanger and enters a diesel oil collecting container;
condensing and collecting low-temperature negative-pressure diesel oil at g.30 DEG C
In the step f, the gaseous diesel which is not completely condensed and liquefied enters a second negative pressure diesel condensing heat exchanger from the first negative pressure diesel condensing heat exchanger to exchange heat with cold water, the temperature is reduced to 30 ℃, the gaseous diesel is condensed into liquid diesel, and the liquid diesel is discharged from a pipeline at the lower part of a heat medium channel of the second negative pressure diesel condensing heat exchanger and enters a diesel collecting container;
h. negative pressure deslagging
After residual oil is stored in the electromagnetic induction heating tank, the negative pressure device is connected with the residual oil collecting container, the pressure in the residual oil collecting container is lower than that of the electromagnetic induction heating tank through the adjustment of the electromagnetic valve, so that the residual oil stored at the bottom in the electromagnetic induction heating tank enters the residual oil collecting container through the pipeline, and the valve between the electromagnetic induction heating tank and the residual oil collecting container is closed after the residual oil is discharged.
Preferably, a solid impurity filter is arranged at a cold medium inlet of the first negative pressure diesel oil condensing heat exchanger, and a solid impurity filtering step is further arranged between the step a and the step b.
Preferably, the heat medium outlets of the first negative pressure diesel oil condensing heat exchanger and the second negative pressure diesel oil condensing heat exchanger are converged and then connected with an oil-water separator, and an oil-water separation step is further arranged after the steps f and g.
Preferably, a pipeline connected between the lower part of the waste mineral oil supply tower and the inlet of the spiral coil is sleeved outside the warm water collecting and discharging pipe to form a sandwich pipe type heat exchange structure, a step of preheating the waste mineral oil to 30 ℃ is further arranged in front of the step a, and the waste mineral oil is subjected to heat exchange with the warm water in the warm water collecting pipe through the sandwich pipe heat exchange structure after coming down from the supply tower and is preheated to 30 ℃.
Technical effects of the invention
This energy-conserving formula mineral oil refines technique of regeneration base oil and diesel oil, on the one hand, retrieve the heat of refining cooling condensation through many places heat transfer, the other party is through providing the distillation and the condensation environment of negative pressure, make the oil can practice gasification and liquefaction at the boiling point and the condensation point of lower temperature, can reduce the required basic energy demand of heating, the energy saving that the two combines can by a wide margin, negative pressure device still provides the function of the deslag of not shutting down, can realize the production technology process of serialization, improve production efficiency.
Drawings
FIG. 1 is a process flow diagram of a process for refining renewable base oil and diesel oil from energy-saving waste mineral oil;
FIG. 2 is a system schematic diagram of a negative pressure energy-saving type regenerated base oil and diesel oil refining plant from waste mineral oil;
FIG. 3 is a basic block diagram of the tube heat exchanger of FIG. 2;
in the figure, 1, an electromagnetic induction heating tank, 2, a base oil collecting heat exchanger, 3, a first negative pressure diesel oil condensing heat exchanger, 4, a second negative pressure diesel oil condensing heat exchanger, 5, a base oil condensing heat exchanger, 6, a waste mineral oil supply tower, 7, a solid impurity filter, 8, an oil-water separator, 9, a vacuum pump, 10, a residual oil collecting container, 11, a warm water collecting drain pipe and 12 are of a sandwich pipe type heat exchange structure.
201. Cold or hot medium channel, 202. hot or cold medium channel.
Detailed Description
The first embodiment is as follows: referring to fig. 1-3, the process for refining regenerated base oil and diesel oil from energy-saving waste mineral oil in the figure is realized by using complete equipment for refining regenerated base oil and diesel oil from negative-pressure energy-saving waste mineral oil, wherein the complete equipment comprises an electromagnetic induction heating tank, a base oil condensing heat exchanger, a base oil collecting heat exchanger, a first negative-pressure diesel oil condensing heat exchanger, a second negative-pressure diesel oil condensing heat exchanger, a waste mineral oil supply tower, a residual oil collecting container and a negative-pressure pump;
the base oil condensing heat exchanger, the base oil collecting heat exchanger, the first negative pressure diesel condensing heat exchanger and the second negative pressure diesel condensing heat exchanger are all tubular heat exchangers with the same structure, and each tubular heat exchanger comprises a cold medium channel and a hot medium channel which are not communicated but exchange heat through heat pipes;
the external part of the base oil collecting heat exchanger is provided with a spiral coil pipe tightly attached to the outer wall of the base oil collecting heat exchanger, the external part of the spiral coil pipe is covered with a heat insulation material, the lower part of the waste mineral oil supply tower is communicated to the inlet of the spiral coil pipe through a pipeline, and the outlet of the spiral coil pipe is communicated to the inlet of a cold medium channel of the first negative pressure diesel oil condensing heat exchanger;
an outlet of a cold medium channel of the first negative pressure diesel oil condensing heat exchanger is communicated with an inlet of a cold medium channel of the base oil condensing heat exchanger through a pipeline;
an outlet of a cold medium channel of the base oil condensing heat exchanger is communicated to an oil inlet of the electromagnetic induction heating tank through a pipeline, the oil inlet of the electromagnetic induction heating tank is positioned at the upper part of a tank body of the electromagnetic induction heating tank, a slag discharging port is arranged at the lower part of the electromagnetic induction heating tank, and the slag discharging port is communicated to the bottom of a residual oil collecting container through a pipeline; the uppermost end of the electromagnetic induction heating tank is provided with a gaseous oil outlet;
an upper interface, a middle interface and a lower interface are sequentially arranged on a heat medium channel of the base oil condensation heat exchanger from top to bottom, and a gaseous oil outlet of the electromagnetic induction heating tank is communicated to the middle interface on the heat medium channel of the base oil condensation heat exchanger through a pipeline;
the lower interface on the hot medium channel of the base oil condensing heat exchanger is connected to the hot medium channel of the base oil collecting heat exchanger through a pipeline, one end of the inlet of the cold medium channel of the base oil collecting heat exchanger is connected to a water source, and the outlet of the cold medium channel of the base oil collecting heat exchanger is communicated to a warm water collecting drain pipe;
an upper interface on a heat medium channel of the base oil condensing heat exchanger is connected to a heat medium inlet of a first negative pressure diesel condensing heat exchanger through a pipeline, a diesel steam outlet is formed in the upper portion of the first negative pressure diesel condensing heat exchanger and communicated with a heat medium inlet in the upper portion of a second negative pressure diesel condensing heat exchanger through a pipeline, and a diesel outlet is formed in the lower portion of the first negative pressure diesel condensing heat exchanger and communicated to a diesel collecting container through a pipeline;
a hot medium outlet at the bottom of the second negative pressure diesel oil condensing heat exchanger is communicated to a diesel oil collecting container through a pipeline, a cold medium inlet of the second negative pressure diesel oil condensing heat exchanger is connected with a water source, a cold medium outlet of the second negative pressure diesel oil condensing heat exchanger is communicated to a warm water collecting drain pipe, the top of a hot medium channel of the second negative pressure diesel oil condensing heat exchanger is communicated to a negative pressure device through a negative pressure pipe, and the negative pressure device is also communicated to the top of a residual oil collecting container through a pipeline;
the bottom of the heat medium channel of the base oil collecting heat exchanger is provided with an oil discharge pipe which is used for connecting a base oil container; the negative pressure device comprises two negative pressure pumps connected in series, and provides 0.098 MPa negative pressure in the normal refining process; the electromagnetic induction heating tank body is a steel tank, an electromagnetic induction coil is wound outside the tank body, and the electromagnetic induction coil is connected to an electromagnetic induction heating power supply; and each pipeline is provided with an electromagnetic valve for on-off control.
The process comprises the following steps:
a. preheating waste mineral oil to 40-60 deg.C
The waste mineral oil flows out of a waste mineral oil supply tower and then enters a spiral coil on the outer wall of a base oil collecting heat exchanger through a pipeline to be preheated, and the base oil collected in the base oil collecting heat exchanger heats the waste mineral oil to 40-60 ℃;
b. preheating waste mineral oil to 100 deg.C
The preheated waste mineral oil in the step a enters a cold medium channel of a first negative pressure diesel oil condensation heat exchanger through a pipeline, exchanges heat with gaseous diesel oil and is preheated to 100 ℃;
c. preheating the waste mineral oil to the temperature of 180℃ and 200 DEG C
The preheated waste mineral oil in the step b enters a cold medium channel of the base oil condensation heat exchanger through a pipeline, exchanges heat with the mixture of the gaseous diesel oil and the gaseous base oil, and is preheated to 180-200 ℃;
d. boiling and evaporating waste mineral oil into mixture of gaseous diesel oil and gaseous base oil
The preheated waste mineral oil in the step c enters the electromagnetic induction heating tank through a pipeline, is heated to 350 ℃ for 300 ℃, and is boiled and evaporated into a mixture of gaseous diesel oil and gaseous base oil;
e. condensing and collecting base oil
D, enabling the mixture of the gaseous diesel oil and the gaseous base oil in the step d to enter a base oil condensation heat exchanger from an electromagnetic induction heating tank through a pipeline to perform heat exchange with the waste mineral oil generated in the step b to cool to 180-200 ℃, condensing the base oil in the mixture of the gaseous diesel oil and the gaseous base oil into liquid base oil, enabling the liquid base oil to flow into a heat medium channel of a base oil collection heat exchanger through the pipeline to perform heat exchange with cold water passing through the base oil collection heat exchanger and the waste mineral oil from a waste mineral oil supply tower to cool to 40-60 ℃ simultaneously;
f.100 deg.C high-temp. negative pressure diesel oil condensation collection
The gaseous diesel oil in the step e enters the first negative pressure diesel oil condensing heat exchanger from the base oil condensing heat exchanger through a pipeline, exchanges heat with the waste mineral oil at the temperature of 40-60 ℃ preheated in the step a, is cooled to 100 ℃, is condensed into liquid diesel oil, and the liquid diesel oil formed is discharged from a pipeline at the lower part of a heat medium channel of the first negative pressure diesel oil condensing heat exchanger and enters a diesel oil collecting container;
condensing and collecting low-temperature negative-pressure diesel oil at g.30 DEG C
In the step f, the gaseous diesel which is not completely condensed and liquefied enters a second negative pressure diesel condensing heat exchanger from the first negative pressure diesel condensing heat exchanger to exchange heat with cold water, the temperature is reduced to 30 ℃, the gaseous diesel is condensed into liquid diesel, and the liquid diesel is discharged from a pipeline at the lower part of a heat medium channel of the second negative pressure diesel condensing heat exchanger and enters a diesel collecting container;
h. negative pressure deslagging
After residual oil is stored in the electromagnetic induction heating tank, the negative pressure device is connected with the residual oil collecting container, the pressure in the residual oil collecting container is lower than that of the electromagnetic induction heating tank through the adjustment of the electromagnetic valve, so that the residual oil stored at the bottom in the electromagnetic induction heating tank enters the residual oil collecting container through the pipeline, and the valve between the electromagnetic induction heating tank and the residual oil collecting container is closed after the residual oil is discharged.
And a solid impurity filter is arranged at a cold medium inlet of the first negative pressure diesel oil condensing heat exchanger, and a solid impurity filtering step is also arranged between the step a and the step b.
And f, converging heat medium outlets of the first negative pressure diesel oil condensing heat exchanger and the second negative pressure diesel oil condensing heat exchanger, connecting the heat medium outlets with an oil-water separator, and performing oil-water separation after the steps f and g.
And a pipeline connected between the lower part of the waste mineral oil supply tower and the inlet of the spiral coil pipe is sleeved outside the warm water collecting and draining pipe to form a sandwich pipe type heat exchange structure, a step of preheating the waste mineral oil to 30 ℃ is further arranged in front of the step a, and the waste mineral oil is subjected to heat exchange with warm water in the warm water collecting pipe through the sandwich pipe heat exchange structure after coming down from the supply tower and is preheated to 30 ℃.
Claims (4)
1. A process for refining regenerated base oil and diesel oil from energy-saving waste mineral oil is realized by adopting complete equipment for refining regenerated base oil and diesel oil from negative-pressure energy-saving waste mineral oil, wherein the complete equipment comprises an electromagnetic induction heating tank, a base oil condensing heat exchanger, a base oil collecting heat exchanger, a first negative-pressure diesel oil condensing heat exchanger, a second negative-pressure diesel oil condensing heat exchanger, a waste mineral oil supply tower, a residual oil collecting container and a negative-pressure pump;
the base oil condensing heat exchanger, the base oil collecting heat exchanger, the first negative pressure diesel condensing heat exchanger and the second negative pressure diesel condensing heat exchanger are all tubular heat exchangers with the same structure, and each tubular heat exchanger comprises a cold medium channel and a hot medium channel which are not communicated but exchange heat through heat pipes;
the external part of the base oil collecting heat exchanger is provided with a spiral coil pipe tightly attached to the outer wall of the base oil collecting heat exchanger, the external part of the spiral coil pipe is covered with a heat insulation material, the lower part of the waste mineral oil supply tower is communicated to the inlet of the spiral coil pipe through a pipeline, and the outlet of the spiral coil pipe is communicated to the inlet of a cold medium channel of the first negative pressure diesel oil condensing heat exchanger;
an outlet of a cold medium channel of the first negative pressure diesel oil condensing heat exchanger is communicated with an inlet of a cold medium channel of the base oil condensing heat exchanger through a pipeline;
an outlet of a cold medium channel of the base oil condensing heat exchanger is communicated to an oil inlet of the electromagnetic induction heating tank through a pipeline, the oil inlet of the electromagnetic induction heating tank is positioned at the upper part of a tank body of the electromagnetic induction heating tank, a slag discharging port is arranged at the lower part of the electromagnetic induction heating tank, and the slag discharging port is communicated to the bottom of a residual oil collecting container through a pipeline; the uppermost end of the electromagnetic induction heating tank is provided with a gaseous oil outlet;
an upper interface, a middle interface and a lower interface are sequentially arranged on a heat medium channel of the base oil condensation heat exchanger from top to bottom, and a gaseous oil outlet of the electromagnetic induction heating tank is communicated to the middle interface on the heat medium channel of the base oil condensation heat exchanger through a pipeline;
the lower interface on the hot medium channel of the base oil condensing heat exchanger is connected to the hot medium channel of the base oil collecting heat exchanger through a pipeline, one end of the inlet of the cold medium channel of the base oil collecting heat exchanger is connected to a water source, and the outlet of the cold medium channel of the base oil collecting heat exchanger is communicated to a warm water collecting drain pipe;
an upper interface on a heat medium channel of the base oil condensing heat exchanger is connected to a heat medium inlet of a first negative pressure diesel condensing heat exchanger through a pipeline, a diesel steam outlet is formed in the upper portion of the first negative pressure diesel condensing heat exchanger and communicated with a heat medium inlet in the upper portion of a second negative pressure diesel condensing heat exchanger through a pipeline, and a diesel outlet is formed in the lower portion of the first negative pressure diesel condensing heat exchanger and communicated to a diesel collecting container through a pipeline;
a hot medium outlet at the bottom of the second negative pressure diesel oil condensing heat exchanger is communicated to a diesel oil collecting container through a pipeline, a cold medium inlet of the second negative pressure diesel oil condensing heat exchanger is connected with a water source, a cold medium outlet of the second negative pressure diesel oil condensing heat exchanger is communicated to a warm water collecting drain pipe, the top of a hot medium channel of the second negative pressure diesel oil condensing heat exchanger is communicated to a negative pressure device through a negative pressure pipe, and the negative pressure device is also communicated to the top of a residual oil collecting container through a pipeline;
the bottom of the heat medium channel of the base oil collecting heat exchanger is provided with an oil discharge pipe which is used for connecting a base oil container; the negative pressure device comprises two negative pressure pumps connected in series; the electromagnetic induction heating tank body is a steel tank, an electromagnetic induction coil is wound outside the tank body, and the electromagnetic induction coil is connected to an electromagnetic induction heating power supply; each pipeline is provided with an electromagnetic valve for on-off control;
the process comprises the following steps:
a. preheating waste mineral oil to 40-60 deg.C
The waste mineral oil flows out of a waste mineral oil supply tower and then enters a spiral coil on the outer wall of a base oil collecting heat exchanger through a pipeline to be preheated, and the base oil collected in the base oil collecting heat exchanger heats the waste mineral oil to 40-60 ℃;
b. preheating waste mineral oil to 100 deg.C
The preheated waste mineral oil in the step a enters a cold medium channel of a first negative pressure diesel oil condensation heat exchanger through a pipeline, exchanges heat with gaseous diesel oil and is preheated to 100 ℃;
c. preheating the waste mineral oil to the temperature of 180℃ and 200 DEG C
The preheated waste mineral oil in the step b enters a cold medium channel of the base oil condensation heat exchanger through a pipeline, exchanges heat with the mixture of the gaseous diesel oil and the gaseous base oil, and is preheated to 180-200 ℃;
d. boiling and evaporating waste mineral oil into mixture of gaseous diesel oil and gaseous base oil
The preheated waste mineral oil in the step c enters the electromagnetic induction heating tank through a pipeline, is heated to 350 ℃ for 300 ℃, and is boiled and evaporated into a mixture of gaseous diesel oil and gaseous base oil;
e. condensing and collecting base oil
D, enabling the mixture of the gaseous diesel oil and the gaseous base oil in the step d to enter a base oil condensation heat exchanger from an electromagnetic induction heating tank through a pipeline to perform heat exchange with the waste mineral oil generated in the step b to cool to 180-200 ℃, condensing the base oil in the mixture of the gaseous diesel oil and the gaseous base oil into liquid base oil, enabling the liquid base oil to flow into a heat medium channel of a base oil collection heat exchanger through the pipeline to perform heat exchange with cold water passing through the base oil collection heat exchanger and the waste mineral oil from a waste mineral oil supply tower to cool to 40-60 ℃ simultaneously;
f.100 deg.C high-temp. negative pressure diesel oil condensation collection
The gaseous diesel oil in the step e enters the first negative pressure diesel oil condensing heat exchanger from the base oil condensing heat exchanger through a pipeline, exchanges heat with the waste mineral oil at the temperature of 40-60 ℃ preheated in the step a, is cooled to 100 ℃, is condensed into liquid diesel oil, and the liquid diesel oil formed is discharged from a pipeline at the lower part of a heat medium channel of the first negative pressure diesel oil condensing heat exchanger and enters a diesel oil collecting container;
condensing and collecting low-temperature negative-pressure diesel oil at g.30 DEG C
In the step f, the gaseous diesel which is not completely condensed and liquefied enters a second negative pressure diesel condensing heat exchanger from the first negative pressure diesel condensing heat exchanger to exchange heat with cold water, the temperature is reduced to 30 ℃, the gaseous diesel is condensed into liquid diesel, and the liquid diesel is discharged from a pipeline at the lower part of a heat medium channel of the second negative pressure diesel condensing heat exchanger and enters a diesel collecting container;
h. negative pressure deslagging
After residual oil is stored in the electromagnetic induction heating tank, the negative pressure device is connected with the residual oil collecting container, the pressure in the residual oil collecting container is lower than that of the electromagnetic induction heating tank through the adjustment of the electromagnetic valve, so that the residual oil stored at the bottom in the electromagnetic induction heating tank enters the residual oil collecting container through the pipeline, and the valve between the electromagnetic induction heating tank and the residual oil collecting container is closed after the residual oil is discharged.
2. The process for refining regenerated base oil and diesel oil from waste mineral oil with energy conservation in accordance with claim 1, wherein: and a solid impurity filter is arranged at a cold medium inlet of the first negative pressure diesel oil condensing heat exchanger, and a solid impurity filtering step is also arranged between the step a and the step b.
3. The process for refining regenerated base oil and diesel oil from waste mineral oil with energy conservation in accordance with claim 1, wherein: and f, converging heat medium outlets of the first negative pressure diesel oil condensing heat exchanger and the second negative pressure diesel oil condensing heat exchanger, connecting the heat medium outlets with an oil-water separator, and performing oil-water separation after the steps f and g.
4. The process for refining regenerated base oil and diesel oil from waste mineral oil with energy conservation in accordance with claim 1, wherein: and a pipeline connected between the lower part of the waste mineral oil supply tower and the inlet of the spiral coil pipe is sleeved outside the warm water collecting and draining pipe to form a sandwich pipe type heat exchange structure, a step of preheating the waste mineral oil to 30 ℃ is further arranged in front of the step a, and the waste mineral oil is subjected to heat exchange with warm water in the warm water collecting pipe through the sandwich pipe heat exchange structure after coming down from the supply tower and is preheated to 30 ℃.
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