CN114106881A - Coal-to-liquid tail oil treatment equipment and method - Google Patents

Abstract

The invention discloses coal-to-liquid tail oil treatment equipment which comprises a pressure reducing tower and an adjusting pipe, wherein the pressure reducing tower is provided with an input port, a diesel oil extraction pipeline, a heavy diesel oil extraction pipeline and a bottom oil pipeline, the pressure reducing tower is communicated with front-end equipment through the input port, oil products are conveyed into the pressure reducing tower through the input port by the front-end equipment, the input end of the diesel oil extraction pipeline is communicated with the upper part of the pressure reducing tower, the input end of the heavy diesel oil extraction pipeline is communicated with the middle part of the pressure reducing tower, the input end of the bottom oil pipeline is communicated with the bottom of the pressure reducing tower, the heavy diesel oil extraction pipeline is communicated with the bottom oil pipeline through the adjusting pipe, and the adjusting pipe is provided with an adjusting valve group. The invention also discloses a coal-to-liquid tail oil treatment method. The coal-to-liquids tail oil treatment equipment and the method provided by the invention can quickly adjust the condensation point of the extracted wax oil, are convenient to adjust and control, are safer, and can ensure the stability of the quality of the wax oil extracted from the bottom of the pressure reduction tower.

Description

Coal-to-liquid tail oil treatment equipment and method

Technical Field

The invention relates to the field of coal-to-liquid production, in particular to coal-to-liquid tail oil treatment equipment and a method.

Background

Coal-based oil is a technology for producing oil products and petrochemical products by using coal as a raw material through a chemical processing process. Under the condition of a hydrofining working condition, produced oil passes through a normal pressure fractionating tower to separate light oil gas, residual oil enters a pressure reducing tower, the residual oil is further treated by the pressure reducing tower, the upper part, the middle part and the bottom of the pressure reducing tower are respectively connected with a diesel oil extraction pipeline, a heavy diesel oil extraction pipeline and a bottom oil pipeline, diesel oil on the upper part of the pressure reducing tower is extracted through the diesel oil extraction pipeline and is delivered outside, heavy diesel oil on the middle part of the pressure reducing tower is extracted through the heavy diesel oil extraction pipeline and is delivered outside, and wax oil on the bottom of the pressure reducing tower is extracted through the bottom oil pipeline and is delivered outside. Due to the different condensation point requirements for the wax oil extracted from the bottom oil line of the vacuum tower, it is often necessary to adjust the equipment operating conditions to change the condensation point of the extracted wax oil. The condensation point of the wax oil extracted from the bottom of the vacuum tower is changed, the final distillation point of the oil product entering the vacuum tower is changed by adjusting the temperature in the atmospheric fractionating tower and the vacuum tower, and the condensation point of the wax oil finally extracted from the bottom of the vacuum tower is adjusted by changing the extraction amount of each line of the atmospheric fractionating tower, a diesel oil extraction pipeline of the vacuum tower and a heavy diesel oil extraction pipeline, so that the existing method has complex processes and operations, and the safety risk in production can be increased by frequent operation; and the oil pumped out from each line is mostly stored in the storage tank, and is influenced by the storage capacity of the storage tank, the situation that the oil pumping out from the line needs to be suspended or cannot be performed again after the storage of a certain storage tank is full can occur, the pumping out from each line is difficult to control stably, and the quality of the wax oil pumped out from the bottom oil pipeline of the vacuum tower is difficult to guarantee in the prior art because the pumping out from each line influences the quality of the wax oil.

Disclosure of Invention

The invention aims to provide a coal-to-liquids tail oil treatment device and method, which can quickly adjust the condensation point of extracted wax oil, are convenient to adjust and control, are safer and can ensure the stability of the quality of the wax oil extracted from the bottom of a pressure reduction tower.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention discloses coal-to-liquids tail oil treatment equipment which comprises a pressure reducing tower and an adjusting pipe, wherein the pressure reducing tower is provided with an input port, a diesel oil extraction pipeline, a heavy diesel oil extraction pipeline and a bottom oil pipeline, the pressure reducing tower is communicated with front-end equipment through the input port, oil is conveyed into the pressure reducing tower through the input port by the front-end equipment, the input end of the diesel oil extraction pipeline is communicated with the upper part of the pressure reducing tower, the input end of the heavy diesel oil extraction pipeline is communicated with the middle part of the pressure reducing tower, the input end of the bottom oil pipeline is communicated with the bottom of the pressure reducing tower, the heavy diesel oil extraction pipeline is communicated with the bottom oil pipeline through the adjusting pipe, and the adjusting pipe is provided with an adjusting valve group;

the diesel oil extraction pipeline is used for extracting diesel oil at the upper part of the vacuum tower;

the heavy firewood extraction pipeline is used for extracting heavy firewood in the middle of the decompression tower;

the bottom oil pipeline is used for extracting wax oil at the bottom of the vacuum tower;

the adjusting pipe is used for enabling the heavy diesel in the heavy diesel extraction pipeline to flow into the bottom oil pipeline, and enabling the heavy diesel to be mixed with the wax oil in the bottom oil pipeline so as to adjust the condensation point of the wax oil in the bottom oil pipeline;

the adjusting valve group is used for adjusting the flow of the heavy firewood flowing into the bottom oil pipeline through the adjusting pipe.

The invention has the beneficial effects that: mix with the wax oil in flowing into the bottom oil pipeline through making the heavy firewood in the pipeline is taken out to heavy firewood, change the condensation point of wax oil, when the condensation point of the wax oil that takes out needs to be adjusted, only need through governing valve group adjustment get into the flow of the heavy firewood in the bottom oil pipeline can, need not change the fractionating tower, the temperature of vacuum tower and the volume of taking out of each pipeline, and easy operation, but the condensation point of the wax oil is taken out in the quick adjustment, be convenient for adjust and control, and is safer, and can guarantee the stability of the wax oil quality that the vacuum tower bottom was taken out.

Further, the bottom oil pipeline comprises a bottom oil main pipe, a first output pipe and a second output pipe, the input end of the bottom oil main pipe is communicated with the bottom of the decompression tower, the output end of the bottom oil main pipe is respectively communicated with the input ends of the first output pipe and the second output pipe, and the output end of the adjusting pipe is communicated with the second output pipe;

the adjusting pipe enables the heavy firewood in the heavy firewood extracting pipeline to flow into the second output pipe, so that the heavy firewood is mixed with the wax oil in the second output pipe, and the condensation point of the wax oil in the second output pipe is adjusted;

the first output pipe is used for outputting the wax oil which is not mixed with the heavy firewood;

and the second output pipe is used for outputting the wax oil mixed with the heavy firewood.

The beneficial effect of adopting the further scheme is that: the output of first output tube is the wax oil that does not mix with the heavy firewood, and the output of second output tube is the wax oil after mixing with the heavy firewood, can satisfy different demands, efficient through the wax oil of first output tube and the simultaneous output high condensation point of second output tube and low condensation point respectively.

Further, the first output pipe is provided with a filter.

The beneficial effect of adopting the further scheme is that: the first output pipe outputs high pour point wax oil which is not mixed with the heavy firewood, the high pour point wax oil is easy to carry impurities, the filter can remove the impurities from the high pour point wax oil, the quality of the output wax oil is ensured, and the output wax oil is prevented from blackening.

The filter further comprises a first bypass pipeline, an input end of the first bypass pipeline is communicated with the first output pipe between the filter and an input end of the first output pipe, an output end of the first bypass pipeline is communicated with the first output pipe between the filter and an output end of the first output pipe, a first valve is arranged on the first output pipe between the input end of the first bypass pipeline and the filter, a second valve is arranged on the first output pipe between the output end of the first bypass pipeline and the filter, and a third valve is arranged on the first bypass pipeline.

The beneficial effect of adopting the further scheme is that: when the quality of the wax oil in the first output pipe is qualified, the third valve can be opened, the first valve and the second valve are closed, and the wax oil is directly output through the first bypass channel, so that the use of the filter is reduced, the service life of the filter can be prolonged, and the maintenance frequency of the filter can be reduced; when the filter needs to be maintained, the first valve and the second valve can be closed, so that the filter can be taken down for cleaning and maintenance; under the condition that only low freezing point wax oil is needed, the first valve and the third valve can be closed, so that all the wax oil flows into the second output pipe to be mixed with the heavy firewood to form the low freezing point wax oil, and the regulation and control are convenient.

Further, the first output pipe is provided with a first cooling device.

The beneficial effect of adopting the further scheme is that: the wax oil is output after being cooled and cooled, and is beneficial to storage.

Furthermore, the device also comprises an online condensation point measuring device, wherein the online condensation point measuring device is arranged on the second output pipe, and the online condensation point measuring device is arranged between the output end of the adjusting pipe and the output end of the second output pipe.

The beneficial effect of adopting the further scheme is that: the condensation point of the mixed heavy firewood and wax oil can be detected on line, the feedback control regulating valve group is favorable for regulating the flow of the heavy firewood entering the second output pipe, the condensation point of the wax oil output by the second output pipe meets the requirement, and the quality is high.

The input end of the second bypass pipeline is communicated with the output end of the adjusting pipe and the second output pipe between the online condensation point measuring devices, the output end of the second bypass pipeline is communicated with the output end of the second output pipe and the second output pipe between the online condensation point measuring devices, a fourth valve is arranged on the second output pipe between the input end of the second bypass pipeline and the online condensation point measuring devices, a fifth valve is arranged on the second output pipeline between the output end of the second bypass pipeline and the online condensation point measuring devices, and a sixth valve is arranged on the second bypass pipeline.

The beneficial effect of adopting the further scheme is that: after the fourth valve and the fifth valve are closed, the on-line condensation point measuring device is convenient to overhaul.

The cooling device comprises a regulating pipe, a second output pipe and a third output pipe, wherein the input end of the third output pipe is communicated with the second output pipe, the input end of the third output pipe is arranged between the output end of the regulating pipe and the output end of the second output pipe, and the third output pipe is provided with a second cooling device.

The beneficial effect of adopting the further scheme is that: wax oil of different temperatures can be output, the wax oil of high temperature is convenient for utilize its temperature to carry out the production of cracking or other products, and the wax oil after the third output tube cooling utilizes the storage.

Furthermore, the heavy firewood extraction pipeline comprises a first heavy firewood extraction pipe and a second heavy firewood extraction pipe, the interior of the vacuum tower is provided with a plurality of layers of fillers from top to bottom, the plurality of layers of fillers divide the inner cavity of the vacuum tower into a tower top cavity, a diesel oil separation cavity, a first heavy firewood separation cavity, a second heavy firewood separation cavity and a tower bottom cavity which are distributed from top to bottom, the diesel oil extraction pipeline is communicated with the diesel oil separation cavity, the first heavy firewood extraction pipe is communicated with the first heavy firewood separation cavity, the second firewood extraction pipe is communicated with the second firewood separation cavity, the bottom oil pipeline is communicated with the tower bottom cavity, the first heavy firewood extraction pipe and the second heavy firewood extraction pipe are communicated through a communicating pipe, a seventh valve is arranged on the communicating pipe, the regulating pipe is communicated with the second firewood extracting pipe, and the input end of the regulating pipe is arranged between the communicating pipe and the output end of the second firewood extracting pipe.

The beneficial effect of adopting the further scheme is that: the heavy firewood separated in the first heavy firewood separating cavity and the second heavy firewood separating cavity can be respectively extracted through the first heavy firewood extracting pipe and the second heavy firewood extracting pipe, so that refined produced oil products are facilitated, and the produced oil products can also be output after being mixed through the second heavy firewood extracting pipe; the heavy firewood added into the bottom oil pipeline through the adjusting pipe can be the heavy firewood separated from the second separated firewood cavity, the heavy firewood separated from the second separated firewood cavity and the first separated firewood cavity is mixed and then added into the bottom oil pipeline through the adjusting pipe, and the proportion of the two kinds of heavy firewood can be adjusted through the seventh valve, so that the property of the heavy firewood flowing into the bottom oil pipeline can be accurately controlled, and the condensation point of the finally mixed wax oil can be accurately adjusted.

The invention discloses a coal-to-liquid tail oil treatment method, which adopts the coal-to-liquid tail oil treatment equipment and comprises the following steps:

mixing: enabling the heavy diesel in the heavy diesel extraction pipeline to flow into the bottom oil pipeline at a certain flow rate, and enabling the heavy diesel flowing into the bottom oil pipeline to be mixed with the wax oil in the bottom oil pipeline so as to adjust the condensation point of the wax oil in the bottom oil pipeline;

and (3) outputting: and outputting the wax oil in the bottom oil pipeline after the mixing step is finished.

The invention has the beneficial effects that: heavy firewood through making in the heavy firewood extraction pipeline flows into in the bottom oil pipeline and mixes with the wax oil, changes the condensation point of wax oil, need not change the temperature of fractionating tower, vacuum tower and the volume of drawing out of each pipeline, easy operation, but quick adjustment takes out the condensation point of wax oil, is convenient for adjust and control, and is safer, and can guarantee the stability of the wax oil quality that the vacuum tower bottom was taken out.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a coal-to-liquids tail oil treatment facility;

in the figure: 1. a vacuum tower; 11. a tower top cavity; 12. a diesel separation chamber; 13. a first heavy firewood separation chamber; 14. a second firewood separating cavity; 15. a tower bottom cavity; 16. a first layer of filler; 17. a second layer of filler; 18. a third layer of filler; 19. a fourth layer of filler; 2. a diesel oil withdrawal line; 3. a heavy firewood extraction pipeline; 31. a first heavy firewood extraction pipe; 32. a second firewood extraction pipe; 33. a communicating pipe; 4. an adjusting tube; 41. an adjusting valve group; 5. a bottom oil line; 51. a base oil main pipe; 52. a second output pipe; 53. a first output pipe; 54. a third output pipe; 61. a first bypass conduit; 62. a second bypass conduit; 71. a filter; 72. a first cooling device; 73. a second cooling device; 74. an on-line condensation point measuring device; 81. a first suction pump; 82. a second suction pump; 83. a third suction pump; 84. a fourth suction pump; 85. a first return pipe; 86. a second refill tube; 87. a third refill tube; 91. a first valve; 92. a second valve; 93. a third valve; 94. a fourth valve; 95. a fifth valve; 96. a sixth valve; 97. a seventh valve; 98. an eighth valve; 99. a ninth valve; 910. a tenth valve;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1, an embodiment of the coal-to-liquids tail oil treatment apparatus disclosed by the present invention includes a vacuum tower 1 and an adjusting pipe 4, the vacuum tower 1 has an input port, a diesel oil extraction pipeline 2, a heavy diesel oil extraction pipeline 3 and a bottom oil pipeline 5, the vacuum tower 1 is communicated with a front-end apparatus through the input port, the front-end apparatus delivers oil into the vacuum tower 1 through the input port, the input end of the diesel oil extraction pipeline 2 is communicated with the upper portion of the vacuum tower 1, the input end of the heavy diesel oil extraction pipeline 3 is communicated with the middle portion of the vacuum tower 1, the input end of the bottom oil pipeline 5 is communicated with the bottom of the vacuum tower 1, the adjusting pipe 4 communicates the heavy diesel oil extraction pipeline 3 with the bottom oil pipeline 5, and the adjusting pipe 4 is provided with an adjusting valve group 41;

the diesel oil extraction pipeline 2 is used for extracting diesel oil at the upper part of the vacuum tower 1;

the heavy firewood extraction pipeline 3 is used for extracting heavy firewood in the middle of the decompression tower 1;

the bottom oil pipeline 5 is used for extracting wax oil at the bottom of the decompression tower 1;

the adjusting pipe 4 is used for enabling the heavy firewood in the heavy firewood extracting pipeline 3 to flow into the bottom oil pipeline 5, and enabling the heavy firewood to be mixed with the wax oil in the bottom oil pipeline 5 so as to adjust the condensation point of the wax oil in the bottom oil pipeline 5;

the regulating valve group 41 is used for regulating the flow of the heavy firewood flowing into the bottom oil pipeline 5 through the regulating pipe 4.

As a further solution of the above embodiment, the bottom oil pipeline 5 includes a bottom oil main pipe 51, a first output pipe 53 and a second output pipe 52, an input end of the bottom oil main pipe 51 communicates with the bottom of the decompression tower 1, an output end of the bottom oil main pipe 51 communicates with input ends of the first output pipe 53 and the second output pipe 52, respectively, and an output end of the adjusting pipe 4 communicates with the second output pipe 52;

the adjusting pipe 4 enables the heavy firewood in the heavy firewood extracting pipeline 3 to flow into the second output pipe 52, and the heavy firewood is mixed with the wax oil in the second output pipe 52 to adjust the condensation point of the wax oil in the second output pipe 52;

the first output pipe 53 is used for outputting the wax oil which is not mixed with the heavy firewood;

the second output pipe 52 is used for outputting the wax oil mixed with the heavy firewood.

The second outlet line 52 has an eighth valve 98, the eighth valve 98 being located between the inlet of the second outlet line 52 and the outlet of the regulator line 4.

As a further alternative to the above embodiment, the first outlet conduit 53 is provided with a filter 71.

As a further solution to the above embodiment, a first bypass pipe 61 is further included, an input end of the first bypass pipe 61 communicates with the first output pipe 53 between the filter 71 and the input end of the first output pipe 53, an output end of the first bypass pipe 61 communicates with the first output pipe 53 between the filter 71 and the output end of the first output pipe 53, the first output pipe 53 between the input end of the first bypass pipe 61 and the filter 71 has a first valve 91, the first output pipe 53 between the output end of the first bypass pipe 61 and the filter 71 has a second valve 92, and the first bypass pipe 61 has a third valve 93. When the color of the wax oil output from the first output pipe 53 is normal, the wax oil in the first output pipe 53 can be directly output through the first bypass pipe 61 without passing through the filter 71, and when the color of the output wax oil is black, the third valve 93 is closed, and the first valve 91 and the second valve 92 are opened, so that the wax oil passes through the filter 71 and then is output.

As a further solution to the above embodiment, the first output pipe 53 is provided with a first cooling device 72, the first cooling device 72 is located between the output end of the first bypass pipe 61 and the output end of the first output pipe 53, the first cooling device 72 can be an evaporator, and can recover the heat energy of the wax oil output from the first output pipe 53 without causing blockage.

As a further scheme of the above embodiment, the device further includes an online condensation point measuring device 74, the online condensation point measuring device 74 is disposed on the second output pipe 52, the online condensation point measuring device 74 is disposed between the output end of the regulating pipe 4 and the output end of the second output pipe 52, the online condensation point detecting device 74 can communicate with the regulating valve group 41 through the control processor, and the regulating valve group 41 automatically controls the regulating valve group 41 to regulate the flow rate of the firewood passing through the regulating pipe 4 according to the information detected by the online condensation point detecting device 74 and the information preset in the control processor.

As a further solution of the above embodiment, a second bypass pipeline 62 is further included, an input end of the second bypass pipeline 62 is communicated with the second output pipe 52 between the output end of the regulating pipe 4 and the line freezing point measuring device 74, an output end of the second bypass pipeline 62 is communicated with the second output pipe 52 between the output end of the second output pipe 52 and the line freezing point measuring device 74, the second output pipe 52 between the input end of the second bypass pipeline 62 and the line freezing point measuring device 74 is provided with a fourth valve 94, the second output pipe 52 between the output end of the second bypass pipeline 62 and the line freezing point measuring device 74 is provided with a fifth valve 95, and the second bypass pipeline 62 is provided with a sixth valve 96.

As a further solution of the above embodiment, a third output pipe 54 is further included, an input end of the third output pipe 54 is communicated with the second output pipe 52, an input end of the third output pipe 54 is between an output end of the regulating pipe 4 and an output end of the second output pipe 52, an input end of the third output pipe 54 is between an output end of the second bypass pipe 62 and an output end of the second output pipe 52, the third output pipe 54 is provided with a second cooling device 73, the wax oil mixed with the firewood is not easily blocked, the second cooling device 73 can be an air cooler, the third output pipe 54 is provided with a ninth valve 99, the ninth valve 99 is arranged between the second cooling device 73 and the input end of the third output pipe 54, the second output pipe 52 is further provided with a tenth valve 910, and the tenth valve 910 is arranged between the input end of the third output pipe 54 and the output end of the second output pipe 52.

As a further proposal of the embodiment, the heavy firewood extraction pipeline 3 comprises a first heavy firewood extraction pipe 31 and a second heavy firewood extraction pipe 32, the interior of the vacuum tower 1 is provided with a plurality of layers of filling materials from top to bottom, the plurality of layers of filling materials divide the inner cavity of the vacuum tower 1 into a tower top cavity 11 and a diesel oil separation cavity 12 which are distributed from top to bottom, the device comprises a first heavy firewood separation cavity 13, a second heavy firewood separation cavity 14 and a tower bottom cavity 15, wherein a diesel oil extraction pipeline 2 is communicated with the top of the diesel oil separation cavity 12, a first heavy firewood extraction pipe 31 is communicated with the top of the first heavy firewood separation cavity 13, a second heavy firewood extraction pipe 32 is communicated with the top of the second heavy firewood separation cavity 14, a bottom oil pipeline 5 is communicated with the bottom of the tower bottom cavity 15, the first heavy firewood extraction pipe 31 is communicated with the second heavy firewood extraction pipe 32 through a communicating pipe 33, a seventh valve 97 is arranged on the communicating pipe 33, an adjusting pipe 4 is communicated with the second heavy firewood extraction pipe 32, and the input end of the adjusting pipe 4 is arranged between the communicating pipe 33 and the output end of the second heavy firewood extraction pipe 32.

Specifically, the bottom oil main pipe 51 is provided with a first suction pump 81, the second heavy firewood extraction pipe 32 is provided with a second suction pump 82, the second suction pump 82 is arranged between the communicating pipe 33 and the input end of the second heavy firewood extraction pipe 32, the first heavy firewood extraction pipe 31 is provided with a third suction pump 83, the third suction pump 83 is arranged between the communicating pipe 33 and the input end of the first heavy firewood extraction pipe 31, and the diesel oil extraction pipeline 2 is provided with a fourth suction pump 84.

4 layers of fillers in the decompression tower 1 are arranged from top to bottom, a tower top cavity 11 is arranged between a first layer of fillers 16 and the tower top, a diesel oil separation cavity 12 is arranged between the first layer of fillers 16 and a second layer of fillers 17, a first heavy diesel oil separation cavity 13 is arranged between the second layer of fillers 17 and a third layer of fillers 18, a second heavy diesel oil separation cavity 14 is arranged between the third layer of fillers 18 and a fourth layer of fillers 19, a tower bottom cavity 15 is arranged between the fourth layer of fillers 19 and the tower bottom, the decompression tower further comprises a first injection pipe 85, a second injection pipe 86 and a third injection pipe 87, the first injection pipe 85 is communicated with the diesel oil extraction pipeline 2 and the lower part of the diesel oil separation cavity 12, the input end of the first injection pipe 85 is arranged between the output end of the fourth suction pump 84 and the output end of the diesel oil extraction pipeline 2, and the first injection pipe 85 enables part of the diesel oil in the diesel oil extraction pipeline 2 to flow back into the diesel oil separation cavity 12 to spray the second layer of fillers 17; the second reinjection pipe 86 is communicated with the first heavy firewood extraction pipe 31 and the lower part of the first heavy firewood separation cavity 13, the input end of the second reinjection pipe 86 is arranged between the output end of the third suction pump 83 and the communicating pipe 33, and the second reinjection pipe 86 enables the heavy firewood in the first heavy firewood extraction pipe 31 to flow back into the first heavy firewood separation cavity 13 to be sprayed with the third layer of filling materials 18; the third injection pipe 87 is communicated with the second firewood extracting pipe 32 and the lower part of the second firewood separating cavity 14, the input end of the third injection pipe 87 is arranged between the output end of the second suction pump 82 and the communicating pipe 33, and the third injection pipe 87 enables the heavy firewood in the second firewood extracting pipe 32 to flow back to the second firewood separating cavity 14 to spray a fourth layer of filling material 19.

The output ends of the first output pipe 53 and the second output pipe 52 are respectively communicated with a storage tank for storing high-freezing-point wax oil and a storage tank for storing low-freezing-point wax oil, and the output end of the third output pipe 54 is communicated with a cracking device or other product production devices.

The first reduction line of the existing decompression tower 1 with 4 layers of fillers can be used as a diesel oil extraction pipeline 2, the second reduction line is used as a first heavy firewood extraction pipe 31, and the third reduction line is used as a second heavy firewood extraction pipe 32.

The embodiment of the coal-to-liquid tail oil treatment method disclosed by the invention adopts the coal-to-liquid tail oil treatment equipment, and comprises the following steps of:

mixing: the heavy firewood in the heavy firewood extracting pipeline 3 flows into the bottom oil pipeline 5 at a certain flow rate, and the heavy firewood flowing into the bottom oil pipeline 5 is mixed with the wax oil in the bottom oil pipeline 5 to adjust the condensation point of the wax oil in the bottom oil pipeline 5;

and (3) outputting: and outputting the wax oil in the bottom oil pipeline 5 after the mixing step is finished.

The method also comprises the steps of online detection and adjustment: the condensation point of the wax oil added with the heavy firewood in the second output pipe 52 of the bottom oil pipeline 5 is measured on line through the on-line condensation point measuring device 74 to form a detection condensation point value, the detection condensation point value is compared with a required condensation point value, the flow of the heavy firewood entering the second output pipe 52 of the bottom oil pipeline 5 is adjusted according to a comparison result, the detection condensation point value of the wax oil added with the heavy firewood is equal to the required condensation point value, and the quality of the output wax oil is ensured.

When the high freezing point wax oil needs to be produced, the third valve 93 or the first valve 91 and the second valve 92 are opened, so that the wax oil flowing out of the bottom oil main pipe 51 is directly cooled by the first cooling device 72 through the first output pipe 53 and then is output.

When the low freezing point wax oil needs to be produced, the regulating valve group 41, the eighth valve 98, the ninth valve 99, the fourth valve 94 and the fifth valve 95 are opened, so that the wax oil flowing out from the bottom oil main pipe 51 flows into the second output pipe 52, is mixed with the heavy firewood flowing in through the regulating pipe 4, and is cooled through the second cooling device 73 through the third output pipe 54 and then is output.

When low freezing point wax oil for cracking or producing other products needs to be produced, the regulating valve group 41, the eighth valve 98, the tenth valve 910, the fourth valve 94 and the fifth valve 95 are opened, and the wax oil flowing out from the bottom oil main pipe 51 flows into the second output pipe 52, is mixed with the heavy diesel flowing in from the regulating pipe 4, and is output through the second output pipe 52.

The flow of heavy firewood in the adjusting pipe 4 can be adjusted through the adjusting valve, the heavy oil mixed with the wax oil in the second output pipe 52 flows into the second output pipe to be larger, the condensation point of the mixed wax oil is lower, and when the adjusting valve bank 41 is closed, the condensation point of the mixed wax oil is increased.

The first outlet pipe 53, the second outlet pipe 52 and the third outlet pipe 54 can independently output high freezing point wax oil, low freezing point wax oil or low freezing point wax oil for cracking or producing other products through the cooperation of each valve, and can simultaneously output wax oil with different freezing points and different temperatures from any two pipelines or three pipelines.

The regulating valve group 41, the eighth valve 98, the first valve 91, the second valve 92, the fourth valve 94, the fifth valve 95, the ninth valve 99 and the tenth valve 910 can be opened, so that the first output pipe 53, the second output pipe 52 and the third output pipe 54 simultaneously convey the wax oil outwards.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a coal liquifaction tail oil treatment facility which characterized in that: the device comprises a decompression tower (1) and an adjusting pipe (4), wherein the decompression tower (1) is provided with an input port, a diesel oil extraction pipeline (2), a heavy diesel oil extraction pipeline (3) and a bottom oil pipeline (5), the decompression tower (1) is communicated with front-end equipment through the input port, the front-end equipment conveys oil products into the decompression tower (1) through the input port, the input end of the diesel oil extraction pipeline (2) is communicated with the upper part of the decompression tower (1), the input end of the heavy diesel oil extraction pipeline (3) is communicated with the middle part of the decompression tower (1), the input end of the bottom oil pipeline (5) is communicated with the bottom of the decompression tower (1), the adjusting pipe (4) communicates the heavy diesel oil extraction pipeline (3) with the bottom oil pipeline (5), and the adjusting pipe (4) is provided with an adjusting valve group (41);

the diesel oil extraction pipeline (2) is used for extracting diesel oil at the upper part of the vacuum tower (1);

the heavy firewood extraction pipeline (3) is used for extracting heavy firewood in the middle of the decompression tower (1);

the bottom oil pipeline (5) is used for extracting wax oil at the bottom of the vacuum tower (1);

the adjusting pipe (4) is used for enabling the heavy firewood in the heavy firewood extraction pipeline (3) to flow into the bottom oil pipeline (5) and enabling the heavy firewood to be mixed with the wax oil in the bottom oil pipeline (5) so as to adjust the condensation point of the wax oil in the bottom oil pipeline (5);

the adjusting valve group (41) is used for adjusting the flow of the heavy firewood flowing into the bottom oil pipeline (5) through the adjusting pipe (4).

2. The coal-to-liquids tail oil treatment apparatus of claim 1, characterized in that: the bottom oil pipeline (5) comprises a bottom oil main pipe (51), a first output pipe (53) and a second output pipe (52), the input end of the bottom oil main pipe (51) is communicated with the bottom of the decompression tower (1), the output end of the bottom oil main pipe (51) is respectively communicated with the input ends of the first output pipe (53) and the second output pipe (52), and the output end of the adjusting pipe (4) is communicated with the second output pipe (52);

the adjusting pipe (4) enables the heavy firewood in the heavy firewood extraction pipeline (3) to flow into the second output pipe (52), and the heavy firewood is mixed with the wax oil in the second output pipe (52) to adjust the condensation point of the wax oil in the second output pipe (52);

the first output pipe (53) is used for outputting the wax oil which is not mixed with the heavy firewood;

the second output pipe (52) is used for outputting the wax oil mixed with the heavy firewood.

3. The coal-to-liquids tail oil processing apparatus of claim 2, characterized in that: the first output pipe (53) is provided with a filter (71).

4. The coal-to-liquids tail oil treatment apparatus of claim 3, characterized in that: the filter further comprises a first bypass pipeline (61), an input end of the first bypass pipeline (61) is communicated with the first output pipe (53) between the filter (71) and an input end of the first output pipe (53), an output end of the first bypass pipeline (61) is communicated with the first output pipe (53) between the filter (71) and an output end of the first output pipe (53), a first valve (91) is arranged on the first output pipe (53) between the input end of the first bypass pipeline (61) and the filter (71), a second valve (92) is arranged on the first output pipe (53) between the output end of the first bypass pipeline (61) and the filter (71), and a third valve (93) is arranged on the first bypass pipeline (61).

5. The coal-to-liquids tail oil processing apparatus of claim 2, characterized in that: the first outlet pipe (53) is provided with a first cooling device (72).

6. The coal-to-liquids tail oil processing apparatus of claim 2, characterized in that: still include online condensation point measuring device (74), online condensation point measuring device (74) set up in on second output tube (52), online condensation point measuring device (74) are in the output of regulating tube (4) with between the output of second output tube (52).

7. The coal-to-liquids tail oil treatment apparatus of claim 6, characterized in that: a second bypass pipeline (62), wherein the input end of the second bypass pipeline (62) is communicated with the second output pipe (52) between the output end of the regulating pipe (4) and the on-line condensation point measuring device (74), the output end of the second bypass pipeline (62) is communicated with the second output pipe (52) between the output end of the second output pipe (52) and the on-line condensation point measuring device (74), a fourth valve (94) is arranged on the second output pipe (52) between the input end of the second bypass pipeline (62) and the on-line condensation point measuring device (74), and a fifth valve (95) is arranged on the second output pipe (52) between the output end of the second bypass pipeline (62) and the on-line condensation point measuring device (74), and a sixth valve (96) is arranged on the second bypass pipeline (62).

8. The coal-to-liquids tail oil processing apparatus of claim 2, characterized in that: the cooling device is characterized by further comprising a third output pipe (54), wherein the input end of the third output pipe (54) is communicated with the second output pipe (52), the input end of the third output pipe (54) is arranged between the output end of the adjusting pipe (4) and the output end of the second output pipe (52), and a second cooling device (73) is arranged on the third output pipe (54).

9. The coal-to-oil tail oil treatment apparatus according to any one of claims 1 to 8, characterized in that: the heavy firewood extraction pipeline (3) comprises a first heavy firewood extraction pipe (31) and a second heavy firewood extraction pipe (32), the interior of the decompression tower (1) is provided with a plurality of layers of fillers from top to bottom, the plurality of layers of fillers divide the inner cavity of the decompression tower (1) into a top cavity (11), a diesel oil separation cavity (12), a first heavy firewood separation cavity (13), a second heavy firewood separation cavity (14) and a bottom cavity (15) which are distributed from top to bottom, the diesel oil extraction pipeline (2) is communicated with the diesel oil separation cavity (12), the first heavy firewood extraction pipe (31) is communicated with the first heavy firewood separation cavity (13), the second heavy firewood extraction pipe (32) is communicated with the second heavy firewood separation cavity (14), the bottom oil pipeline (5) is communicated with the bottom cavity (15), and the first heavy firewood extraction pipe (31) is communicated with the second heavy firewood extraction pipe (32) through a communicating pipe (33), the communicating pipe (33) is provided with a seventh valve (97), the adjusting pipe (4) is communicated with the second firewood extracting pipe (32), and the input end of the adjusting pipe (4) is arranged between the communicating pipe (33) and the output end of the second firewood extracting pipe (32).

10. A coal-to-liquid tail oil treatment method is characterized by comprising the following steps: the coal-to-oil tail oil treatment apparatus according to any one of claims 1 to 9, comprising the steps of:

mixing: -causing the heavy diesel in the heavy diesel extraction line (3) to flow into the bottom oil line (5) at a flow rate, causing the heavy diesel flowing into the bottom oil line (5) to mix with the wax oil in the bottom oil line (5) to adjust the condensation point of the wax oil in the bottom oil line (5);

and (3) outputting: outputting the wax oil in the bottom oil pipeline (5) after the mixing step is finished.

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