Coal-to-liquid tail oil processing equipment and method

Abstract

The present invention discloses a coal-to-liquid tail oil processing equipment, including a vacuum tower and a regulating pipe, the vacuum tower has an input port, a diesel extraction pipeline, a heavy diesel extraction pipeline and a bottom oil pipeline, the vacuum tower is connected with a front-end device through the input port, the front-end device transports the oil product into the vacuum tower through the input port, the input end of the diesel extraction pipeline is connected with the upper part of the vacuum tower, the input end of the heavy diesel extraction pipeline is connected with the middle part of the vacuum tower, the input end of the bottom oil pipeline is connected with the bottom of the vacuum tower, the regulating pipe connects the heavy diesel extraction pipeline with the bottom oil pipeline, and a regulating valve group is provided on the regulating pipe. The present invention also discloses a coal-to-liquid tail oil processing method. The coal-to-liquid tail oil processing equipment and method provided by the present invention can quickly adjust the condensation point of the extracted wax oil, is convenient for adjustment and control, is safer, and can ensure the stability of the quality of the wax oil extracted from the bottom of the vacuum tower.

Description

Technical Field

[0001] The present invention relates to the field of coal-to-liquid production, and in particular to equipment and a method for processing tail oil from coal-to-liquid. Background Art

[0002] Coal-to-liquids (CTL) is a technology that uses coal as a raw material to produce oil and petrochemical products through chemical processing. Under hydrorefining conditions, the produced oil passes through an atmospheric distillation tower to separate the light oil and gas. The remaining oil enters a vacuum tower for further processing. The top, middle, and bottom sections of the vacuum tower are connected to diesel extraction pipelines, heavy diesel extraction pipelines, and bottom oil pipelines, respectively. Diesel from the top of the vacuum tower is extracted and transported through the diesel extraction pipeline, heavy diesel from the middle of the vacuum tower is extracted and transported through the heavy diesel extraction pipeline, and wax oil from the bottom of the vacuum tower is extracted and transported through the bottom oil pipeline. Due to varying requirements for the pour point of the wax oil extracted from the bottom oil pipeline of the vacuum tower, equipment operating conditions often need to be adjusted to change the pour point of the extracted wax oil. At present, the pour point of the wax oil extracted from the bottom of the vacuum tower is changed by adjusting the temperature in the atmospheric distillation tower and the vacuum tower to change the final distillation point of the oil entering the vacuum tower, and the extraction amount of each line of the atmospheric distillation tower, the diesel extraction pipeline and the heavy diesel extraction pipeline of the vacuum tower are changed to adjust the pour point of the wax oil finally extracted from the bottom of the vacuum tower. The existing method has complex procedures and operations, and frequent operations will increase safety risks in production. In addition, the oil extracted from each line is mostly stored in a storage tank. Due to the storage capacity of the storage tank, it may be necessary to suspend the extraction of oil from a line or it may be impossible to extract oil after a certain storage tank is full. The extraction amount of each line is difficult to stably control. Since the extraction amount of each line affects the quality of the wax oil, the quality of the wax oil extracted from the bottom oil pipeline of the vacuum tower is difficult to guarantee in the existing technology. Summary of the Invention

[0003] The present invention aims to provide a coal-to-liquid tail oil processing device and method, which can quickly adjust the pour point of the extracted wax oil, facilitate adjustment and control, is safer, and can ensure the stability of the quality of the wax oil extracted from the bottom of the vacuum tower.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] The coal-to-liquid tail oil processing equipment disclosed in the present invention includes a vacuum tower and a regulating pipe. The vacuum tower has an input port, a diesel extraction pipeline, a heavy diesel extraction pipeline, and a bottom oil pipeline. The vacuum tower is connected to a front-end device through the input port. The front-end device transports oil products into the vacuum tower through the input port. The input end of the diesel extraction pipeline is connected to the upper part of the vacuum tower, the input end of the heavy diesel extraction pipeline is connected to the middle part of the vacuum tower, and the input end of the bottom oil pipeline is connected to the bottom of the vacuum tower. The regulating pipe connects the heavy diesel extraction pipeline and the bottom oil pipeline, and the regulating pipe is provided with a regulating valve group.

[0006] The diesel extraction pipeline is used to extract the diesel from the upper part of the vacuum tower;

[0007] The heavy firewood extraction pipeline is used to extract the heavy firewood in the middle of the vacuum tower;

[0008] The bottom oil pipeline is used to extract the wax oil at the bottom of the vacuum tower;

[0009] The regulating pipe is used to allow the heavy fuel oil in the heavy fuel oil extraction pipeline to flow into the bottom oil pipeline, so as to mix the heavy fuel oil with the wax oil in the bottom oil pipeline, thereby adjusting the pour point of the wax oil in the bottom oil pipeline;

[0010] The regulating valve group is used to regulate the flow of the heavy diesel flowing into the bottom oil pipeline through the regulating pipe.

[0011] The beneficial effects of the present invention are as follows: by allowing the heavy wood in the heavy wood extraction pipeline to flow into the bottom oil pipeline and mix with the wax oil, the pour point of the wax oil is changed. When the pour point of the extracted wax oil needs to be adjusted, it is only necessary to adjust the flow rate of the heavy wood entering the bottom oil pipeline through the regulating valve group, without changing the temperature of the distillation tower and the vacuum tower and the extraction amount of each pipeline. The operation is simple, the pour point of the extracted wax oil can be quickly adjusted, the adjustment and control are convenient, and it is safer. Moreover, the stability of the quality of the wax oil extracted from the bottom of the vacuum tower can be guaranteed.

[0012] Furthermore, the bottom oil pipeline includes a bottom oil main pipe, a first output pipe, and a second output pipe. The input end of the bottom oil main pipe is connected to the bottom of the vacuum tower, the output end of the bottom oil main pipe is connected to the input ends of the first output pipe and the second output pipe respectively, and the output end of the regulating pipe is connected to the second output pipe.

[0013] The regulating pipe allows the heavy firewood in the heavy firewood extraction pipeline to flow into the second output pipe, so that the heavy firewood is mixed with the wax oil in the second output pipe to adjust the pour point of the wax oil in the second output pipe;

[0014] The first output pipe is used to output the wax oil that is not mixed with the heavy wood;

[0015] The second output pipe is used to output the wax oil mixed with the heavy fuel oil.

[0016] The beneficial effect of adopting the above further scheme is that the first output pipe outputs wax oil that is not mixed with heavy wood, and the second output pipe outputs wax oil mixed with heavy wood. High-freezing point and low-freezing point wax oils can be output simultaneously through the first output pipe and the second output pipe respectively, meeting different needs with high efficiency.

[0017] Furthermore, the first output pipe is provided with a filter.

[0018] The beneficial effect of adopting the above further scheme is that the first output pipe outputs high-freezing point wax oil that is not mixed with heavy firewood. High-freezing point wax oil is easy to carry impurities. The filter can pass through the high-freezing point wax oil to remove impurities, thereby ensuring the quality of the output wax oil and preventing the output wax oil from turning black.

[0019] Furthermore, it also includes a first bypass pipe, the input end of the first bypass pipe is connected to the first output pipe between the filter and the input end of the first output pipe, the output end of the first bypass pipe is connected to the first output pipe between the filter and the output end of the first output pipe, a first valve is provided on the first output pipe between the input end of the first bypass pipe and the filter, a second valve is provided on the first output pipe between the output end of the first bypass pipe and the filter, and a third valve is provided on the first bypass pipe.

[0020] The beneficial effects of adopting the above-mentioned further scheme are: 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 can be closed, and the wax oil can be directly output through the first bypass channel, thereby reducing the use of the filter, increasing the service life of the filter and reducing the maintenance frequency of the filter; when the filter needs maintenance, the first valve and the second valve can be closed to facilitate the removal of the filter for cleaning and maintenance; when only low-freezing-point wax oil is needed, the first valve and the third valve can also be closed to allow all the wax oil to flow into the second output pipe and mix with the heavy wood to form low-freezing-point wax oil, which is convenient for adjustment and control.

[0021] Furthermore, the first output pipe is provided with a first cooling device.

[0022] The beneficial effect of adopting the above further solution is that the wax oil is output after being cooled, which is conducive to storage.

[0023] Furthermore, it also includes an online freezing point measuring device, which is arranged on the second output tube, and the online freezing point measuring device is between the output end of the regulating tube and the output end of the second output tube.

[0024] The beneficial effect of adopting the above further scheme is that the pour point of the mixture of heavy wood and wax oil can be detected online, which is conducive to feedback control of the regulating valve group to adjust the flow of heavy wood entering the second output pipe, so that the pour point of the wax oil output from the second output pipe meets the requirements and is of high quality.

[0025] Furthermore, it also includes a second bypass pipe, the input end of the second bypass pipe is connected to the output end of the regulating pipe and the second output pipe between the online freezing point measuring device, the output end of the second bypass pipe is connected to the second output pipe between the output end of the second output pipe and the online freezing point measuring device, the second output pipe between the input end of the second bypass pipe and the online freezing point measuring device is provided with a fourth valve, the second output pipe between the output end of the second bypass pipe and the online freezing point measuring device is provided with a fifth valve, and the second bypass pipe is provided with a sixth valve.

[0026] The beneficial effect of adopting the above further solution is that after closing the fourth valve and the fifth valve, it is convenient to inspect and repair the online freezing point measuring device.

[0027] Furthermore, it includes a third output pipe, the input end of the third output pipe is connected to the second output pipe, the input end of the third output pipe is 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.

[0028] The beneficial effect of adopting the above further solution is that wax oils of different temperatures can be output, high-temperature wax oils are convenient for utilizing their temperature for cracking or production of other products, and the wax oils cooled and lowered in the third output pipe are used for storage.

[0029] Furthermore, the heavy diesel extraction pipeline includes a first heavy diesel extraction pipe and a second heavy diesel extraction pipe, and the interior of the pressure reducing tower has multiple layers of fillers from top to bottom, and the multiple layers of fillers divide the inner cavity of the pressure reducing tower into a tower top cavity, a diesel separation cavity, a first heavy diesel separation cavity, a second heavy diesel separation cavity and a tower bottom cavity distributed from top to bottom. The diesel extraction pipeline is connected to the diesel separation cavity, the first heavy diesel extraction pipe is connected to the first heavy diesel separation cavity, the second heavy diesel extraction pipe is connected to the second heavy diesel separation cavity, the bottom oil pipeline is connected to the tower bottom cavity, the first heavy diesel extraction pipe and the second heavy diesel extraction pipe are connected through a connecting pipe, the connecting pipe has a seventh valve, the regulating pipe is connected to the second heavy diesel extraction pipe, and the input end of the regulating pipe is between the output end of the connecting pipe and the second heavy diesel extraction pipe.

[0030] The beneficial effects of adopting the above-mentioned further scheme are as follows: the heavy firewood separated in the first heavy firewood separation chamber and the second heavy firewood separation chamber can be extracted separately through the first heavy firewood extraction pipe and the second heavy firewood extraction pipe, which is conducive to the refined output of oil products, and can also be mixed and output through the second heavy firewood extraction pipe; the heavy firewood added to the bottom oil pipeline through the regulating pipe can be the heavy firewood separated in the second heavy firewood separation chamber alone, and the heavy firewood separated from the second heavy firewood separation chamber and the first heavy firewood separation chamber can be mixed and then added to the bottom oil pipeline through the regulating pipe, and the ratio of the two heavy firewoods can be adjusted by the seventh valve, which is conducive to accurately controlling the properties of the heavy firewood flowing into the bottom oil pipeline, and facilitating the accurate adjustment of the freezing point of the wax oil after the final mixture.

[0031] The coal-to-liquid tail oil processing method disclosed in the present invention uses the above-mentioned coal-to-liquid tail oil processing equipment, comprising the following steps:

[0032] Mixing: allowing the heavy fuel oil in the heavy fuel oil extraction pipeline to flow into the bottom oil pipeline at a certain flow rate, so that the heavy fuel oil flowing into the bottom oil pipeline is mixed with the wax oil in the bottom oil pipeline to adjust the pour point of the wax oil in the bottom oil pipeline;

[0033] Output: output the wax oil in the bottom oil pipeline after completing the mixing step.

[0034] The beneficial effects of the present invention are: by allowing the heavy wood in the heavy wood extraction pipeline to flow into the bottom oil pipeline and mix with the wax oil, the pour point of the wax oil is changed, and there is no need to change the temperature of the distillation tower and the vacuum tower and the extraction amount of each pipeline. The operation is simple, the pour point of the extracted wax oil can be quickly adjusted, and it is convenient for adjustment and control, which is safer and can ensure the stability of the quality of the wax oil extracted from the bottom of the vacuum tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an embodiment of a coal-to-liquid tail oil processing device;

[0036] In the figure: 1. Vacuum tower; 11. Tower top chamber; 12. Diesel separation chamber; 13. First heavy diesel separation chamber; 14. Second heavy diesel separation chamber; 15. Tower bottom chamber; 16. First layer of packing; 17. Second layer of packing; 18. Third layer of packing; 19. Fourth layer of packing; 2. Diesel extraction pipeline; 3. Heavy diesel extraction pipeline; 31. First heavy diesel extraction pipe; 32. Second heavy diesel extraction pipe; 33. Connecting pipe; 4. Regulating pipe; 41. Regulating valve group; 5. Bottom oil pipeline; 51. Bottom oil main pipe; 52. Second output pipe; 53. First output pipe; 54. Third output pipe; 61. First Bypass pipe; 62, second bypass pipe; 71, filter; 72, first cooling device; 73, second cooling device; 74, online freezing point measuring device; 81, first suction pump; 82, second suction pump; 83, third suction pump; 84, fourth suction pump; 85, first return injection pipe; 86, second return injection pipe; 87, third return injection pipe; 91, first valve; 92, second valve; 93, third valve; 94, fourth valve; 95, fifth valve; 96, sixth valve; 97, seventh valve; 98, eighth valve; 99, ninth valve; 910, tenth valve; DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, an embodiment of the coal-to-liquid tail oil processing equipment disclosed in the present invention includes a vacuum tower 1 and a regulating pipe 4. The vacuum tower 1 has an input port, a diesel extraction pipeline 2, a heavy diesel extraction pipeline 3, and a bottom oil pipeline 5. The vacuum tower 1 is connected to the front-end equipment through the input port, and the front-end equipment transports the oil product into the vacuum tower 1 through the input port. The input end of the diesel extraction pipeline 2 is connected to the upper part of the vacuum tower 1, the input end of the heavy diesel extraction pipeline 3 is connected to the middle part of the vacuum tower 1, and the input end of the bottom oil pipeline 5 is connected to the bottom of the vacuum tower 1. The regulating pipe 4 connects the heavy diesel extraction pipeline 3 with the bottom oil pipeline 5, and the regulating pipe 4 has a regulating valve group 41.

[0039] The diesel extraction pipeline 2 is used to extract the diesel from the upper part of the vacuum tower 1;

[0040] The heavy fuel oil extraction pipeline 3 is used to extract the heavy fuel oil from the middle of the vacuum tower 1;

[0041] The bottom oil pipeline 5 is used to extract the wax oil from the bottom of the vacuum tower 1;

[0042] The regulating pipe 4 is used to allow the heavy fuel oil in the heavy fuel oil extraction pipeline 3 to flow into the bottom oil pipeline 5, so as to mix the heavy fuel oil with the wax oil in the bottom oil pipeline 5 and adjust the pour point of the wax oil in the bottom oil pipeline 5;

[0043] The regulating valve group 41 is used to regulate the flow of heavy diesel flowing into the bottom oil pipeline 5 through the regulating pipe 4 .

[0044] As a further embodiment 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. The input end of the bottom oil main pipe 51 is connected to the bottom of the vacuum tower 1, and the output end of the bottom oil main pipe 51 is connected to the input ends of the first output pipe 53 and the second output pipe 52, respectively. The output end of the regulating pipe 4 is connected to the second output pipe 52.

[0045] The regulating pipe 4 allows the heavy wood in the heavy wood extraction pipeline 3 to flow into the second output pipe 52, so that the heavy wood is mixed with the wax oil in the second output pipe 52 to adjust the pour point of the wax oil in the second output pipe 52;

[0046] The first output pipe 53 is used to output the wax oil that is not mixed with heavy fuel oil;

[0047] The second output pipe 52 is used to output the wax oil mixed with the heavy fuel oil.

[0048] The second output pipe 52 is provided with an eighth valve 98 , which is located between the input end of the second output pipe 52 and the output end of the regulating pipe 4 .

[0049] As a further solution of the above embodiment, a filter 71 is provided on the first output pipe 53 .

[0050] As a further embodiment of the above embodiment, a first bypass pipe 61 is further provided. The input end of the first bypass pipe 61 is connected to the first output pipe 53 between the filter 71 and the input end of the first output pipe 53. The output end of the first bypass pipe 61 is connected to the first output pipe 53 between the filter 71 and the output end of the first output pipe 53. A first valve 91 is provided on the first output pipe 53 between the input end of the first bypass pipe 61 and the filter 71. A second valve 92 is provided on the first output pipe 53 between the output end of the first bypass pipe 61 and the filter 71. A third valve 93 is provided on the first bypass pipe 61. When the wax oil outputted from the first output pipe 53 is of normal color, the wax oil in the first output pipe 53 can be output directly through the first bypass pipe 61 without passing through the filter 71. When the output wax oil turns black, the third valve 93 is closed, and the first valve 91 and the second valve 92 are opened, allowing the wax oil to pass through the filter 71 before being output.

[0051] As a further solution of the above embodiment, the first output pipe 53 is provided with a first cooling device 72, and the first cooling device 72 is 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, which can recover the heat energy of the wax oil output in the first output pipe 53 without causing blockage.

[0052] As a further solution of the above embodiment, it also includes an online freezing point measuring device 74, which is arranged on the second output pipe 52, and the online freezing point measuring device 74 is between the output end of the regulating pipe 4 and the output end of the second output pipe 52. The online freezing point detection 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 adjust the flow of heavy wood through the regulating pipe 4 according to the information detected by the online freezing point detection device 74 and the information preset in the control processor.

[0053] As a further solution of the above embodiment, it also includes a second bypass pipe 62, the input end of the second bypass pipe 62 is connected to the second output pipe 52 between the output end of the regulating pipe 4 and the online freezing point measuring device 74, the output end of the second bypass pipe 62 is connected to the second output pipe 52 between the output end of the second output pipe 52 and the online freezing point measuring device 74, the second output pipe 52 between the input end of the second bypass pipe 62 and the online 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 pipe 62 and the online freezing point measuring device 74 is provided with a fifth valve 95, and the second bypass pipe 62 is provided with a sixth valve 96.

[0054] As a further solution of the above embodiment, it also includes a third output pipe 54, the input end of the third output pipe 54 is connected to the second output pipe 52, the input end of the third output pipe 54 is between the output end of the regulating pipe 4 and the output end of the second output pipe 52, the input end of the third output pipe 54 is between the output end of the second bypass pipe 62 and the 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 heavy diesel is not easy to be clogged, the second cooling device 73 can optionally 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 also provided with a tenth valve 910, 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.

[0055] As a further solution of the above embodiment, the heavy diesel extraction pipeline 3 includes a first heavy diesel extraction pipe 31 and a second heavy diesel extraction pipe 32. The interior of the vacuum tower 1 has multiple layers of fillers from top to bottom, and the multiple layers of fillers divide the inner cavity of the vacuum tower 1 into a tower top chamber 11, a diesel separation chamber 12, a first heavy diesel separation chamber 13, a second heavy diesel separation chamber 14 and a tower bottom chamber 15 distributed from top to bottom. The diesel extraction pipeline 2 is connected to the top of the diesel separation chamber 12, the first heavy diesel extraction pipe 31 is connected to the top of the first heavy diesel separation chamber 13, the second heavy diesel extraction pipe 32 is connected to the top of the second heavy diesel separation chamber 14, the bottom oil pipeline 5 is connected to the bottom of the tower bottom chamber 15, the first heavy diesel extraction pipe 31 and the second heavy diesel extraction pipe 32 are connected through a connecting pipe 33, and the connecting pipe 33 has a seventh valve 97. The regulating pipe 4 is connected to the second heavy diesel extraction pipe 32, and the input end of the regulating pipe 4 is between the output end of the connecting pipe 33 and the second heavy diesel extraction pipe 32.

[0056] Specifically, the bottom oil main pipe 51 is provided with a first suction pump 81, the second heavy diesel extraction pipe 32 is provided with a second suction pump 82, the second suction pump 82 is between the connecting pipe 33 and the input end of the second heavy diesel extraction pipe 32, the first heavy diesel extraction pipe 31 is provided with a third suction pump 83, the third suction pump 83 is between the connecting pipe 33 and the input end of the first heavy diesel extraction pipe 31, and the diesel extraction pipeline 2 is provided with a fourth suction pump 84.

[0057] The packing in the vacuum tower 1 is provided with 4 layers from top to bottom. The top cavity 11 is formed between the first layer of packing 16 and the top of the tower. The diesel separation cavity 12 is formed between the first layer of packing 16 and the second layer of packing 17. The first heavy diesel separation cavity 13 is formed between the second layer of packing 17 and the third layer of packing 18. The second heavy diesel separation cavity 14 is formed between the third layer of packing 18 and the fourth layer of packing 19. The bottom cavity 15 is formed between the fourth layer of packing 19 and the bottom of the tower. The vacuum tower 1 also includes a first return pipe 85, a second return pipe 86 and a third return pipe 87. The first return pipe 85 connects the diesel extraction pipeline 2 and the lower part of the diesel separation cavity 12. The input end of the first return pipe 85 is between the output end of the fourth suction pump 84 and the output end of the diesel extraction pipeline 2. The first return pipe 85 allows the diesel to be extracted. Part of the diesel in pipeline 2 flows back to the diesel separation chamber 12 to spray the second layer of filler 17; the second return pipe 86 connects the first heavy diesel extraction pipe 31 and the lower part of the first heavy diesel separation chamber 13, and the input end of the second return pipe 86 is between the output end of the third suction pump 83 and the connecting pipe 33. The second return pipe 86 allows part of the heavy diesel in the first heavy diesel extraction pipe 31 to flow back to the first heavy diesel separation chamber 13 to spray the third layer of filler 18; the third return pipe 87 connects the second heavy diesel extraction pipe 32 and the lower part of the second heavy diesel separation chamber 14. The input end of the third return pipe 87 is between the output end of the second suction pump 82 and the connecting pipe 33. The third return pipe 87 allows part of the heavy diesel in the second heavy diesel extraction pipe 32 to flow back to the second heavy diesel separation chamber 14 to spray the fourth layer of filler 19.

[0058] The output ends of the first output pipe 53 and the second output pipe 52 are connected to a storage tank for storing high-freezing point wax oil and a storage tank for storing low-freezing point wax oil, respectively. The output end of the third output pipe 54 is connected to a cracking device or other product production equipment.

[0059] The existing vacuum tower 1 with four layers of fillers can be used as the diesel extraction pipeline 2, the second vacuum line as the first heavy diesel extraction pipe 31, and the third vacuum line as the second heavy diesel extraction pipe 32.

[0060] An embodiment of the coal-to-liquid tail oil processing method disclosed in the present invention uses the above-mentioned coal-to-liquid tail oil processing equipment, including the following steps:

[0061] Mixing: The heavy fuel oil in the heavy fuel oil extraction line 3 flows into the bottom oil line 5 at a certain flow rate, so that the heavy fuel oil flowing into the bottom oil line 5 is mixed with the wax oil in the bottom oil line 5 to adjust the pour point of the wax oil in the bottom oil line 5;

[0062] Output: Output the wax oil in the bottom oil pipeline 5 after completing the mixing step.

[0063] It also includes an online detection and adjustment step: the freezing point of the wax oil after adding heavy fuel oil into the second output pipe 52 of the bottom oil pipeline 5 is measured online by the online freezing point measuring device 74 to form a detection freezing point value, the detection freezing point value is compared with the required freezing point value, and the flow rate of the heavy fuel oil entering the second output pipe 52 of the bottom oil pipeline 5 is adjusted according to the comparison result, so that the detection freezing point value of the wax oil after adding heavy fuel oil is equal to the required freezing point value, thereby ensuring the quality of the output wax oil.

[0064] When 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 output through the first output pipe 53 after being cooled by the first cooling device 72 .

[0065] When it is necessary to produce low-freezing-point wax oil, the regulating valve group 41, the eighth valve 98, the ninth valve 99, the fourth valve 94 and the fifth valve 95 are opened to allow the wax oil flowing out through the bottom oil main pipe 51 to flow into the second output pipe 52, and after mixing with the heavy wood flowing in through the regulating pipe 4, it is cooled by the second cooling device 73 through the third output pipe 54 and then output.

[0066] When it is necessary to produce low-freezing point wax oil for cracking or producing other products, 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 through the bottom oil main pipe 51 flows into the second output pipe 52, mixes with the heavy wood flowing in through the regulating pipe 4, and is output through the second output pipe 52.

[0067] The flow of heavy oil passing through the regulating pipe 4 can be adjusted by the regulating valve. The greater the amount of heavy oil flowing into the second output pipe 52 and mixing with the wax oil, the lower the pour point of the mixed wax oil. The longer the regulating valve group 41 is closed, the higher the pour point of the mixed wax oil.

[0068] The first output pipe 53, the second output pipe 52, and the third output 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 coordination of various valves. Any two or three pipelines can also simultaneously output wax oils with different freezing points and temperatures.

[0069] 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 to allow the first output pipe 53, the second output pipe 52 and the third output pipe 54 to simultaneously transport wax oil outward.

[0070] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A coal-to-liquid tail oil processing equipment, characterized in that: The invention comprises a vacuum tower (1) and a regulating pipe (4), wherein the vacuum tower (1) has an input port, a diesel extraction pipeline (2), a heavy diesel extraction pipeline (3) and a bottom oil pipeline (5), wherein the vacuum tower (1) is connected to a front-end device via the input port, and the front-end device transports the oil product into the vacuum tower (1) via the input port, wherein the input end of the diesel extraction pipeline (2) is connected to the upper part of the vacuum tower (1), the input end of the heavy diesel extraction pipeline (3) is connected to the middle part of the vacuum tower (1), the input end of the bottom oil pipeline (5) is connected to the bottom of the vacuum tower (1), the regulating pipe (4) connects the heavy diesel extraction pipeline (3) with the bottom oil pipeline (5), and the regulating pipe (4) is provided with a regulating valve group (41); The diesel extraction pipeline (2) is used to extract the diesel from the upper part of the vacuum tower (1); The heavy firewood extraction pipeline (3) is used to extract the heavy firewood in the middle of the vacuum tower (1); The bottom oil pipeline (5) is used to extract the wax oil at the bottom of the vacuum tower (1); The regulating pipe (4) is used to allow the heavy fuel oil in the heavy fuel oil extraction pipeline (3) to flow into the bottom oil pipeline (5), so as to mix the heavy fuel oil with the wax oil in the bottom oil pipeline (5) to adjust the freezing point of the wax oil in the bottom oil pipeline (5); The regulating valve group (41) is used to regulate the flow rate of the heavy fuel oil flowing into the bottom oil pipeline (5) through the regulating pipe (4); 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 connected to the bottom of the vacuum tower (1); the output end of the bottom oil main pipe (51) is respectively connected to the input ends of the first output pipe (53) and the second output pipe (52); and the output end of the regulating pipe (4) is connected to the second output pipe (52); The regulating pipe (4) allows the heavy firewood in the heavy firewood extraction pipeline (3) to flow into the second output pipe (52), so that the heavy firewood is mixed with the wax oil in the second output pipe (52) to adjust the freezing point of the wax oil in the second output pipe (52); The first output pipe (53) is used to output the wax oil that is not mixed with the heavy fuel oil; The second output pipe (52) is used to output the wax oil mixed with the heavy fuel oil; The first output pipe (53) is provided with a filter (71); The first output pipe (53) is provided with a first cooling device (72).

2. The coal-to-liquid tail oil processing equipment according to claim 1, characterized in that: The invention further comprises a first bypass pipe (61), wherein an input end of the first bypass pipe (61) is connected to 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) is connected to the first output pipe (53) between the filter (71) and the output end of the first output pipe (53), a first valve (91) is provided on the first output pipe (53) between the input end of the first bypass pipe (61) and the filter (71), a second valve (92) is provided on the first output pipe (53) between the output end of the first bypass pipe (61) and the filter (71), and a third valve (93) is provided on the first bypass pipe (61).

3. The coal-to-liquid tail oil processing equipment according to claim 1, characterized in that: It also includes an online freezing point measuring device (74), which is arranged on the second output tube (52), and the online freezing point measuring device (74) is between the output end of the regulating tube (4) and the output end of the second output tube (52).

4. The coal-to-liquid tail oil processing equipment according to claim 3 is characterized in that: The invention also comprises a second bypass pipe (62), wherein the input end of the second bypass pipe (62) is connected to the output end of the regulating pipe (4) and the second output pipe (52) between the online freezing point measuring device (74), the output end of the second bypass pipe (62) is connected to the second output pipe (52) between the output end of the second output pipe (52) and the online freezing point measuring device (74), a fourth valve (94) is provided on the second output pipe (52) between the input end of the second bypass pipe (62) and the online freezing point measuring device (74), a fifth valve (95) is provided on the second output pipe (52) between the output end of the second bypass pipe (62) and the online freezing point measuring device (74), and a sixth valve (96) is provided on the second bypass pipe (62).

5. The coal-to-liquid tail oil processing equipment according to claim 1, characterized in that: It also comprises a third output pipe (54), the input end of the third output pipe (54) being in communication with the second output pipe (52), the input end of the third output pipe (54) being between the output end of the regulating pipe (4) and the output end of the second output pipe (52), and the third output pipe (54) being provided with a second cooling device (73).

6. The coal-to-liquid tail oil processing equipment according to any one of claims 1 to 5, characterized in that: The heavy diesel extraction pipeline (3) comprises a first heavy diesel extraction pipe (31) and a second heavy diesel extraction pipe (32). The interior of the vacuum tower (1) has multiple layers of fillers from top to bottom. The multiple layers of fillers divide the inner cavity of the vacuum tower (1) into a tower top cavity (11), a diesel separation cavity (12), a first heavy diesel separation cavity (13), a second heavy diesel separation cavity (14) and a tower bottom cavity (15) from top to bottom. The diesel extraction pipeline (2) is connected to the diesel separation cavity (12). The first heavy diesel extraction pipe (31) is connected to the first heavy diesel separation cavity (14). 3), the second heavy-duty fuel oil extraction pipe (32) is connected to the second heavy-duty fuel oil separation chamber (14), the bottom oil pipeline (5) is connected to the tower bottom chamber (15), the first heavy-duty fuel oil extraction pipe (31) is connected to the second heavy-duty fuel oil extraction pipe (32) via a connecting pipe (33), the connecting pipe (33) is provided with a seventh valve (97), the regulating pipe (4) is connected to the second heavy-duty fuel oil extraction pipe (32), and the input end of the regulating pipe (4) is between the output end of the connecting pipe (33) and the second heavy-duty fuel oil extraction pipe (32).

7. A method for treating tail oil from coal-to-liquids, characterized in that: Using the coal-to-liquid tail oil processing equipment as described in any one of claims 1 to 6, The following steps are involved: Mixing: allowing the heavy fuel oil in the heavy fuel oil extraction pipeline (3) to flow into the bottom oil pipeline (5) at a certain flow rate, so that the heavy fuel oil flowing into the bottom oil pipeline (5) is mixed with the wax oil in the bottom oil pipeline (5), so as to adjust the freezing point of the wax oil in the bottom oil pipeline (5); Output: Output the wax oil in the bottom oil pipeline (5) after completing the mixing step.

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