CN115637164A - Method and system for pumping light diesel oil with specific control dry point by catalytic or coking fractionating tower - Google Patents
Method and system for pumping light diesel oil with specific control dry point by catalytic or coking fractionating tower Download PDFInfo
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- CN115637164A CN115637164A CN202110814239.2A CN202110814239A CN115637164A CN 115637164 A CN115637164 A CN 115637164A CN 202110814239 A CN202110814239 A CN 202110814239A CN 115637164 A CN115637164 A CN 115637164A
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- 239000002283 diesel fuel Substances 0.000 title claims abstract description 299
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 33
- 238000004939 coking Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005086 pumping Methods 0.000 title claims abstract description 10
- 238000010992 reflux Methods 0.000 claims abstract description 158
- 238000000605 extraction Methods 0.000 claims abstract description 78
- 239000000463 material Substances 0.000 claims abstract description 53
- 239000007791 liquid phase Substances 0.000 claims description 39
- 238000005194 fractionation Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 239000012071 phase Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000003502 gasoline Substances 0.000 claims description 6
- 238000005504 petroleum refining Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 47
- 238000004821 distillation Methods 0.000 description 7
- 238000004523 catalytic cracking Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the field of petroleum refining, and discloses a method and a system for pumping light diesel oil with a specific control dry point by a catalytic or coking fractionating tower. The system comprises a fractionating tower, a heavy and light diesel oil stripping tower, a diesel oil circulating reflux device, a fractionating tower top circulating reflux device and a fractionating tower in-tower circulating reflux device; the fractionating tower is sequentially provided with a tower top material flow output pipeline, a tower top circulating reflux device inlet and outlet, a light diesel oil stripping tower oil gas return port, a light diesel oil extraction port, a reflux distribution pipe, a heavy and light diesel oil stripping tower oil gas return port, a heavy and light diesel oil extraction port, a fractionating tower middle circulating reflux device inlet and outlet and a tower bottom material flow output pipeline from top to bottom; the diesel oil circulation reflux device is connected with the reflux distribution pipe. The invention can more simply, flexibly and accurately control the dry point index of the light diesel oil to be pumped out by adding a diesel oil circulation on the existing fractionating tower.
Description
Technical Field
The invention belongs to the field of petroleum refining, and particularly relates to a method and a system for pumping light diesel oil with a specific control dry point by a catalytic or coking fractionating tower.
Background
The fractionating towers of the conventional catalytic cracking and delayed coking units are provided with diesel oil extraction ports, the catalytic cracking unit is called a light diesel oil extraction port, and light diesel oil (also called light cycle oil) products with the distillation range of about 200-360 ℃ are extracted and simultaneously used as lean absorption oil with stable rear absorption. Along with the flexibility requirement of the product distribution requirement, part of devices require increasing the yield of diesel products, and along with the technical progress, some newly developed processes require further cutting the existing diesel products and extracting light diesel with specific dry point requirements, and meanwhile, the heavier fractions in the existing light diesel are used as materials of a specific combination process. This requires modifications to existing flow schemes on existing catalytic or coker fractionators. In order to increase the yield of light diesel oil, a light diesel oil extraction port is additionally arranged above the existing light diesel oil extraction port so as to extract light diesel oil with lighter distillation range. However, since there is no corresponding control means, the light diesel oil extracted and the heavier diesel oil fraction at the lower part are seriously overlapped in distillation range, and the effective control cannot be carried out, and the requirement of extracting the light diesel oil with specific quality cannot be met.
Disclosure of Invention
The invention aims to provide a method and a system for extracting light diesel oil with a specific control dry point from a catalytic or coking fractionating tower aiming at the defects of the prior art. The method can more simply, conveniently, flexibly and accurately control the dry point index of the light diesel product to be pumped out by adding a diesel cycle on the existing fractionating tower, and meets the requirements of special products and the material quality requirement of a specific combination process.
In order to achieve the above object, the present invention provides in a first aspect a system for extracting light diesel oil with a specific control dry point from a catalytic or coking fractionation tower, the system comprising a fractionation tower, a heavy and light diesel oil stripping tower, a diesel oil circulation reflux device, a fractionation tower top circulation reflux device and a fractionation tower middle circulation reflux device;
the fractionating tower is sequentially provided with a tower top material flow output pipeline, a tower top circulating reflux device inlet and outlet, a light diesel oil stripping tower oil gas return port, a light diesel oil extraction port, a reflux distribution pipe, a heavy and light diesel oil stripping tower oil gas return port, a heavy and light diesel oil extraction port, a fractionating tower middle circulating reflux device inlet and outlet and a tower bottom material flow output pipeline from top to bottom;
the reflux distribution pipe is arranged below the drawing plate corresponding to the tray where the light diesel oil drawing-out opening is positioned and above the drawing plate corresponding to the tray where the heavy diesel oil drawing-out opening is positioned, and the diesel oil circulating reflux device is connected with the reflux distribution pipe;
the upper part of the heavy and light diesel oil stripping tower is connected with the heavy and light diesel oil extraction port;
the upper part of the light diesel stripping tower is connected with the light diesel extraction port;
the fractionating tower top circulating reflux device is respectively connected with an inlet and an outlet of the fractionating tower top circulating reflux device;
and the circulating reflux device in the fractionating tower is respectively connected with the inlet and the outlet of the circulating reflux device in the fractionating tower.
The invention provides a method for extracting light diesel oil with a specific control dry point by a catalytic or coking fractionating tower, which adopts a system for extracting light diesel oil with a specific control dry point by the catalytic or coking fractionating tower, and comprises the following steps:
taking part of the heavy and light diesel oil liquid phase material flow which is extracted from the heavy and light diesel oil extraction port and stripped by the heavy and light diesel oil stripping tower as a liquid phase material flow to circularly flow back, and entering the reflux distribution pipe through the diesel oil circulating reflux device, controlling the gas phase temperature under the extraction plate corresponding to the tower tray where the light diesel oil extraction port is located, further controlling the dry point of the light diesel oil product, and taking other part of the heavy and light diesel oil liquid phase material flow as the heavy and light diesel oil product;
and (3) stripping the light diesel liquid phase material pumped out from the light diesel oil pumping-out port by the light diesel oil stripping tower to obtain the light diesel oil product.
In a third aspect of the present invention, there is provided a method for extracting light diesel oil with specific control dry point by using a catalytic or coking fractionator, the method comprising the following steps:
taking liquid phase material flows extracted from extraction openings of trays on 1-3 layers above the heavy and light diesel oil extraction opening as liquid phase material flows to circularly flow back, and sequentially enter the reflux distribution pipe through the diesel oil circulating reflux device, controlling the gas phase temperature under an extraction plate corresponding to the tray where the light diesel oil extraction opening is positioned, and further controlling the dry point of the light diesel oil product;
the heavy and light diesel oil liquid phase material extracted from the heavy and light diesel oil extraction port is subjected to steam stripping by the heavy and light diesel oil stripping tower to obtain a heavy and light diesel oil product;
and (3) stripping the light diesel liquid phase extracted from the light diesel oil extraction port by the light diesel oil stripping tower to obtain the light diesel oil product.
The technical scheme of the invention has the following beneficial effects:
(1) The invention adds a diesel oil circulation on the existing fractionating tower to further cut the existing diesel oil product, can more simply, conveniently, flexibly and accurately control the dry point index of the light diesel oil product to be extracted, meets the requirements of special products and the material quality requirement of a specific combination process, and simultaneously takes the heavy diesel oil as the material of the specific combination process.
(2) The invention increases diesel oil circulation, which reduces the quantity of heat taken by the circulating reflux at the top of the fractionating tower, but the diesel oil circulation temperature is higher than that of the circulating reflux at the top of the fractionating tower, therefore, the invention improves the utilization of the heat energy at the higher temperature, and is beneficial to energy saving.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, wherein like reference numerals generally represent like parts in the exemplary embodiments of the present invention.
Figure 1 shows a schematic diagram of a catalytic or coker fractionator system for withdrawing light diesel fuel at a specific controlled dry point, as provided in example 1 of the present invention.
Figure 2 shows a schematic diagram of a catalytic or coker fractionator system that provides a specific controlled dry point light diesel extraction system according to example 2 of the present invention.
The reference numerals are explained below:
the system comprises a T1-fractionating tower, a T2-heavy and light diesel oil stripping tower, a T3-light diesel oil stripping tower, a P1-in-tower circulating reflux pump, an E1-in-tower circulating reflux heat exchanger, a P2-tower top circulating reflux pump, an E2-tower top circulating reflux heat exchanger, a P3-heavy and light diesel oil pump, an E3-heavy and light diesel oil heat exchanger, a P4-light diesel oil pump, an E4-light diesel oil heat exchanger, a P5-diesel oil circulating reflux pump and an E5-diesel oil circulating reflux heat exchanger;
1-a bottoms stream outlet line; 2-a circulating reflux device in the fractionating tower; 3-a fractionating tower top circulating reflux device; 4-an overhead stream take-off line; 6-heavy and light diesel oil product output pipeline; 7-light diesel oil product output pipeline; 8-diesel oil circulation reflux device; 9-heavy light diesel oil stripping steam input pipeline; 10-light diesel stripping steam input line; 12-light diesel oil extraction port; 13-heavy and light diesel oil extraction port; 14-light diesel stripper oil gas line; 15-heavy and light diesel oil stripper oil-gas line.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a system for pumping light diesel oil with a specific control dry point by a catalytic or coking fractionating tower, which comprises a fractionating tower, a heavy and light diesel oil stripping tower, a diesel oil circulating reflux device, a fractionating tower top circulating reflux device and a fractionating tower middle circulating reflux device;
the fractionating tower is sequentially provided with a tower top material flow output pipeline, a tower top circulating reflux device inlet and outlet, a light diesel oil stripping tower oil gas return port, a light diesel oil extraction port, a reflux distribution pipe, a heavy and light diesel oil stripping tower oil gas return port, a heavy and light diesel oil extraction port, a fractionating tower middle circulating reflux device inlet and outlet and a tower bottom material flow output pipeline from top to bottom;
the reflux distribution pipe is arranged below the drawing plate corresponding to the tray where the light diesel oil drawing-out opening is positioned and above the drawing plate corresponding to the tray where the heavy diesel oil drawing-out opening is positioned, and the diesel oil circulating reflux device is connected with the reflux distribution pipe;
the upper part of the heavy and light diesel oil stripping tower is connected with the heavy and light diesel oil extraction port;
the upper part of the light diesel stripping tower is connected with the light diesel extraction port;
the fractionating tower top circulating reflux device is respectively connected with an inlet and an outlet of the fractionating tower top circulating reflux device;
and the circulating reflux device in the fractionating tower is respectively connected with the inlet and the outlet of the circulating reflux device in the fractionating tower.
According to the invention, the heat exchange quantity values of the diesel oil circulating reflux device are different according to different control requirements of light diesel oil dry points, and the positions of the light diesel oil extraction ports are different.
According to the invention, preferably, the diesel oil circulating reflux device is a diesel oil circulating reflux pipeline, and the bottom of the heavy and light diesel oil stripping tower is sequentially connected with a heavy and light diesel oil pump and a heavy and light diesel oil heat exchanger; the output pipeline of the heavy and light diesel oil heat exchanger is respectively connected with the diesel oil circulating reflux pipeline and the heavy and light diesel oil product output pipeline; the other end of the diesel oil circulating return pipeline is connected to the return distribution pipe.
According to the invention, preferably, the diesel oil circulation reflux device is a fractionating tower liquid phase material circulation reflux device; the fractionating tower liquid phase material flow circulating reflux device comprises a diesel oil circulating reflux pump and a diesel oil circulating reflux heat exchanger connected with the diesel oil circulating reflux pump, the diesel oil circulating reflux pump is connected with a pumping-out opening of a tray at 1-3 layers above the heavy and light diesel oil pumping-out opening, and the other end of the diesel oil circulating reflux heat exchanger is connected to the reflux distribution pipe;
the tower bottom of the heavy and light diesel stripping tower is sequentially connected with a heavy and light diesel pump and a heavy and light diesel heat exchanger; and the output pipeline of the heavy and light diesel oil heat exchanger is connected to the output pipeline of the heavy and light diesel oil product.
According to the invention, preferably, the bottom of the light diesel stripping tower is connected with a light diesel pump, a light diesel heat exchanger and a light diesel product output pipeline in sequence.
In the present invention, the main task of the fractionator is to separate the reaction products into slurry oil, heavy and light diesel oil, naphtha and rich gas.
According to the invention, preferably, the overhead stream outlet line is a naphtha and rich gas mixture outlet line. The naphtha and rich gas mixture separated from the fractionation column exits the fractionation column through the overhead output line.
According to the present invention, preferably, the bottoms stream outlet line is a slurry outlet line. The slurry separated from the fractionation column exits the fractionation column through the bottoms stream outlet line.
According to the invention, preferably, the fractionating tower top circulation reflux device comprises a tower top circulation reflux pump and a tower top circulation reflux heat exchanger, and is used for controlling the dry point of the tower top crude gasoline.
According to the invention, preferably, the recycle reflux device in the fractionating tower comprises a recycle reflux pump in the fractionating tower and a recycle reflux heat exchanger in the fractionating tower, and is used for controlling the dry point of the heavy and light diesel oil product.
According to the invention, preferably, the lower part of the heavy and light diesel stripper and the lower part of the light diesel stripper are each provided with a stripping steam input line.
According to the invention, preferably, the top outlet of the light diesel stripper is provided with a light diesel stripper oil-gas line, and the light diesel stripper oil-gas line is connected with the oil-gas return port of the light diesel stripper. The light diesel stripping tower oil-gas line and the light diesel stripping tower oil-gas return port are used for sending a mixture of first water vapor and first light component oil-gas discharged from the top of the light diesel stripping tower to the fractionating tower.
According to the invention, preferably, a heavy and light diesel oil stripper oil-gas line is arranged at the top outlet of the heavy and light diesel oil stripper, and is connected with the heavy and light diesel oil stripper oil-gas return port through the heavy and light diesel oil stripper oil-gas line. And the heavy and light diesel oil stripper oil-gas line and the heavy and light diesel oil stripper oil-gas return opening are used for sending a mixture of second steam and second light component oil-gas discharged from the top of the heavy and light diesel oil stripper to the fractionating tower.
According to the invention, the drawing plate corresponding to the tray on which the light diesel oil drawing port is located is preferably a full-drawing or half-drawing hopper.
According to the present invention, it is preferable that the fractionation column has 30 to 34 blocks without adjusting the number of trays when a diesel pumparound device is additionally provided.
The invention provides a method for extracting light diesel oil with a specific control dry point by a catalytic or coking fractionating tower, which adopts a system for extracting light diesel oil with a specific control dry point by the catalytic or coking fractionating tower, and comprises the following steps:
part of the heavy and light diesel oil liquid phase material flow which is extracted from the heavy and light diesel oil extraction port and stripped by the heavy and light diesel oil stripping tower is taken as liquid phase material flow to circularly flow back, and enters the reflux distribution pipe through the diesel oil circulating reflux device, the gas phase temperature under the extraction plate corresponding to the tower tray where the light diesel oil extraction port is positioned is controlled, the dry point of the light diesel oil product is further controlled, and other parts of heavy and light diesel oil liquid phase material flow are taken as the heavy and light diesel oil product;
and (3) stripping the light diesel liquid phase extracted from the light diesel oil extraction port by the light diesel oil stripping tower to obtain the light diesel oil product.
The invention does not need to change the prior conventional processes of pumping out, boosting and heat exchanging the heavy and light diesel oil.
In a third aspect of the present invention, there is provided a method for extracting light diesel oil with specific control dry point by using a catalytic or coking fractionator, the method comprising the following steps:
taking liquid phase material flows extracted from extraction openings of trays on 1-3 layers above the heavy and light diesel oil extraction opening as liquid phase material flows to circularly flow back, and sequentially enter the reflux distribution pipe through the diesel oil circulating reflux device, controlling the gas phase temperature under an extraction plate corresponding to the tray where the light diesel oil extraction opening is positioned, and further controlling the dry point of the light diesel oil product;
the heavy and light diesel oil liquid phase material extracted from the heavy and light diesel oil extraction port is subjected to steam stripping by the heavy and light diesel oil stripping tower to obtain a heavy and light diesel oil product;
and (3) stripping the light diesel liquid phase material pumped out from the light diesel oil pumping-out port by the light diesel oil stripping tower to obtain the light diesel oil product.
The invention does not need to change the prior conventional processes of pumping out, boosting and exchanging heat of the heavy and light diesel oil.
The invention is further illustrated by the following examples.
Example 1
The embodiment provides a system for extracting light diesel oil with a specific control dry point from a catalytic or coking fractionating tower, and as shown in fig. 1, the system comprises a fractionating tower T1, a heavy and light diesel oil stripping tower T2, a light diesel oil stripping tower T3, a diesel oil circulation reflux device 8, a fractionating tower top circulation reflux device 3 and a fractionating tower middle circulation reflux device 2; the number of the trays of the fractionating tower T1 is 32, after the diesel oil circulation reflux device 8 is additionally arranged, the number of the trays is not newly increased, and the trays are numbered from bottom to top.
The fractionating tower T1 is sequentially provided with a tower top material flow output pipeline 4, an inlet and an outlet of a fractionating tower top circulating reflux device 3, a light diesel oil stripping tower oil gas return port, a light diesel oil extraction port 12, a reflux distribution pipe (not shown), a heavy and light diesel oil stripping tower oil gas return port, a heavy and light diesel oil extraction port 13, an inlet and an outlet of a circulating reflux device 2 in the fractionating tower and a tower bottom material flow output pipeline 1 from top to bottom;
the overhead stream output line 4 is a raw gasoline and rich gas mixture output line;
the fractionating tower top circulating reflux device 3 is respectively connected with an inlet and an outlet of the fractionating tower top circulating reflux device 3; the fractionating tower top circulating reflux device 3 comprises a tower top circulating reflux pump P2 and a tower top circulating reflux heat exchanger E2 and is used for controlling the dry point of the tower top crude gasoline;
the light diesel oil extraction port 12 is arranged on a tray with the number of 24, the heavy diesel oil extraction port 13 is arranged on a tray with the number of 17, and the extraction plate corresponding to the tray on which the light diesel oil extraction port 12 is arranged is a half extraction hopper. The upper part of the light diesel stripping tower T3 is connected with the light diesel extraction port 12; the bottom of the light diesel stripping tower T3 is sequentially connected with a light diesel pump P4, a light diesel heat exchanger E4 and a light diesel product output pipeline 7.
The reflux distribution pipe is arranged on a tray with the number of 23;
the diesel oil circulating and refluxing device 8 is a diesel oil circulating and refluxing pipeline, and the bottom of the heavy and light diesel oil stripping tower T2 is sequentially connected with a heavy and light diesel oil pump P3 and a heavy and light diesel oil heat exchanger E3; the output pipeline of the heavy and light diesel oil heat exchanger is respectively connected with the diesel oil circulating reflux pipeline and the heavy and light diesel oil product output pipeline 6; the other end of the diesel oil circulating return pipeline is connected to the return distribution pipe;
the upper part of the heavy and light diesel oil stripping tower T2 is connected with the heavy and light diesel oil extraction port 13;
and the circulating reflux device 2 in the fractionating tower is respectively connected with the inlet and the outlet of the circulating reflux device 2 in the fractionating tower. The fractionating tower in-tower circulation reflux device 2 comprises a tower in-tower circulation reflux pump P1 and a tower in-tower circulation reflux heat exchanger E1 and is used for controlling the dry point of heavy and light diesel oil products;
the bottom material flow output pipeline 1 is an oil slurry output pipeline;
and a heavy and light diesel stripping steam input pipeline 9 is arranged at the lower part of the heavy and light diesel stripping tower T2. And the top outlet of the heavy and light diesel oil stripping tower T2 is provided with a heavy and light diesel oil stripping tower oil-gas line 15, and the heavy and light diesel oil stripping tower oil-gas line is connected with the oil-gas return port of the heavy and light diesel oil stripping tower.
The lower part of the light diesel stripping tower T3 is provided with a light diesel stripping steam input pipeline 10. The top outlet of the light diesel stripping tower T3 is provided with a light diesel stripping tower oil-gas line 14, and the light diesel stripping tower oil-gas line 14 is connected with the light diesel stripping tower oil-gas return port.
The system for extracting light diesel oil with specific control dry point by the catalytic or coking fractionating tower in the embodiment is a modification of a catalytic cracking unit of 350 ten thousand tons per year in a certain domestic refinery. The system of the embodiment is used for cutting diesel at 250 ℃, so that the dry point of the light diesel product D86 is not more than 250 ℃, the dry point of the heavy diesel product D86 is not more than 360 ℃, and the specific process flow is as follows:
part of the heavy and light diesel oil liquid phase material flow which is extracted by the heavy and light diesel oil extraction port 13, stripped by the heavy and light diesel oil stripping tower T2, boosted by the heavy and light diesel oil pump P3 and heat exchanged by the heavy and light diesel oil heat exchanger E3 is taken as liquid phase material flow to circularly flow back, and enters the reflux distribution pipe through the diesel oil circulating reflux pipeline, the gas phase temperature under the extraction plate corresponding to the tower tray where the light diesel oil extraction port 12 is positioned is controlled, the dry point of the light diesel oil product is further controlled, and the other part of the heavy and light diesel oil liquid phase material flow is taken as the heavy and light diesel oil product (the mass flow is 80352kg/h, the D86 distillation range is 234-360 ℃, and the residue-removed oil hydrogenation device is used as fresh feed of the catalytic device after being modified);
and (3) enabling the light diesel liquid phase substance pumped out through the light diesel pumping outlet 12 to flow through the light diesel stripping tower T3 for stripping, the light diesel pump P4 for boosting and the light diesel heat exchanger E4 for heat exchange, and then outputting from a light diesel product output pipeline 7 to obtain the light diesel product (the mass flow is 15000kg/h, the D86 distillation range is 178 ℃ -250 ℃) which is directly returned to the lifting pipe for recycling as the light diesel product.
The naphtha and rich gas mixture separated from the fractionator T1 exits the fractionator T1 through the overhead stream outlet line 4. The slurry oil separated from the fractionating tower T1 is discharged from the fractionating tower through the bottom stream outlet line 1.
Example 2
The embodiment provides a system for extracting light diesel oil with a specific control dry point by a catalytic or coking fractionating tower, and as shown in fig. 2, the system comprises a fractionating tower T1, a heavy and light diesel oil stripping tower T2, a light diesel oil stripping tower T3, a diesel oil circulation reflux device 8, a fractionating tower top circulation reflux device 3 and a fractionating tower middle circulation reflux device 2; the number of the trays of the fractionating tower T1 is 32, after the diesel oil circulating reflux device 8 is additionally arranged, the number of the trays is not newly increased, and the trays are numbered from bottom to top.
The fractionating tower T1 is sequentially provided with a tower top material flow output pipeline 4, an inlet and an outlet of a fractionating tower top circulating reflux device 3, a light diesel oil stripping tower oil gas return port, a light diesel oil extraction port 12, a reflux distribution pipe (not shown), a heavy and light diesel oil stripping tower oil gas return port, a heavy and light diesel oil extraction port 13, an inlet and an outlet of a fractionating tower middle circulating reflux device 2 and a tower bottom material flow output pipeline 1 from top to bottom;
the overhead stream output line 4 is a naphtha and rich gas mixture output line;
the fractionating tower top circulating reflux device 3 is respectively connected with an inlet and an outlet of the fractionating tower top circulating reflux device 3; the fractionating tower top circulating reflux device 3 comprises a tower top circulating reflux pump P2 and a tower top circulating reflux heat exchanger E2 and is used for controlling the dry point of the tower top crude gasoline;
the light diesel oil extraction port 12 is arranged on a tray with the number of 22, the heavy diesel oil extraction port 13 is arranged on a tray with the number of 14, and the extraction plate corresponding to the tray with the light diesel oil extraction port 12 is a full extraction hopper. The upper part of the light diesel stripping tower T3 is connected with the light diesel extraction port 12; the tower bottom of the light diesel stripping tower T3 is sequentially connected with a light diesel pump P4, a light diesel heat exchanger E4 and a light diesel product output pipeline 7.
The reflux distribution pipe is arranged on a tray with the number of 21;
the diesel oil circulating reflux device 8 is a fractionating tower liquid phase material flow circulating reflux device; the fractionating tower liquid phase material flow circulating reflux device 8 comprises a diesel oil circulating reflux pump P5 and a diesel oil circulating reflux heat exchanger E5 connected with the diesel oil circulating reflux pump P5, the diesel oil circulating reflux pump P5 is connected with a pumping-out opening of a tower tray with the serial number of 18, and the other end of the diesel oil circulating reflux heat exchanger E5 is connected to the reflux distribution pipe;
the bottom of the heavy and light diesel stripping tower T2 is sequentially connected with a heavy and light diesel pump P3 and a heavy and light diesel heat exchanger E3; the output line of the heavy and light diesel heat exchanger E3 is connected to the heavy and light diesel product output line 6.
The upper part of the heavy and light diesel oil stripping tower T2 is connected with the heavy and light diesel oil extraction port 13;
and the circulating reflux device 2 in the fractionating tower is respectively connected with the inlet and the outlet of the circulating reflux device 2 in the fractionating tower. The fractionating tower in-tower circulation reflux device 2 comprises a tower in-tower circulation reflux pump P1 and a tower in-tower circulation reflux heat exchanger E1 and is used for controlling the dry point of heavy and light diesel oil products;
the bottom material flow output pipeline 1 is an oil slurry output pipeline;
and a heavy and light diesel stripping steam input pipeline 9 is arranged at the lower part of the heavy and light diesel stripping tower T2. And an outlet at the top of the heavy and light diesel oil stripping tower T2 is provided with a heavy and light diesel oil stripping tower oil-gas line 15, and the heavy and light diesel oil stripping tower oil-gas line is connected with an oil-gas return port of the heavy and light diesel oil stripping tower.
The lower part of the light diesel stripping tower T3 is provided with a light diesel stripping steam input pipeline 10. The top outlet of the light diesel stripping tower T3 is provided with a light diesel stripping tower oil-gas line 14, and the light diesel stripping tower oil-gas line 14 is connected with the light diesel stripping tower oil-gas return port.
The system for extracting light diesel oil with specific control dry point by the catalytic or coking fractionating tower in the embodiment is a modification of a catalytic cracking device of 80 ten thousand tons per year in a certain domestic refinery. The system of the embodiment is used for cutting diesel at 260 ℃, so that the dry point of the light diesel product D86 is not more than 260 ℃, the dry point of the heavy diesel product D86 is not more than 481 ℃, and the specific process flow is as follows:
taking a liquid phase material flow extracted from an extraction opening of the tray numbered 18 as a liquid phase material flow to circularly flow back, and sequentially passing through the diesel oil circulating reflux pump P5 and the diesel oil circulating reflux heat exchanger E5 to enter the reflux distribution pipe, controlling the gas phase temperature under an extraction plate corresponding to the tray where the light diesel oil extraction opening 12 is positioned, and further controlling the dry point of the light diesel oil product;
and (3) allowing the heavy and light diesel oil liquid phase substance extracted from the heavy and light diesel oil extraction port 13 to flow through the heavy and light diesel oil stripping tower for stripping T2, boosting the pressure of a heavy and light diesel oil pump P3 and exchanging heat with a heavy and light diesel oil heat exchanger E3 to obtain a heavy and light diesel oil product, wherein the mass flow is 11632kg/h, and the D86 distillation range is 260-480 ℃.
And after the light diesel liquid phase material pumped out from the light diesel oil pumping-out port 12 flows through the light diesel oil stripping tower T3 for stripping, the light diesel oil pump P4 for boosting and the light diesel oil heat exchanger E4 for heat exchange, the light diesel oil liquid phase material is output from a light diesel oil product output pipeline 7 and is divided into two paths, one path is used as a reabsorber of a reabsorber, the other path is used as a light diesel oil product output device, the mass flow of the light diesel oil product is 8762kg/h, and the D86 distillation range is 195-260 ℃.
The naphtha and rich gas mixture separated from the fractionator T1 exits the fractionator T1 through the overhead stream outlet line 4. The slurry oil separated from the fractionating tower T1 is discharged from the fractionating tower through the bottom stream outlet line 1.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A system for pumping light diesel oil with a specific control dry point by a catalytic or coking fractionating tower is characterized by comprising a fractionating tower, a heavy and light diesel oil stripping tower, a diesel oil circulating reflux device, a fractionating tower top circulating reflux device and a fractionating tower middle circulating reflux device;
the fractionating tower is sequentially provided with a tower top material flow output pipeline, a tower top circulating reflux device inlet and outlet, a light diesel oil stripping tower oil gas return port, a light diesel oil extraction port, a reflux distribution pipe, a heavy and light diesel oil stripping tower oil gas return port, a heavy and light diesel oil extraction port, a fractionating tower middle circulating reflux device inlet and outlet and a tower bottom material flow output pipeline from top to bottom;
the reflux distribution pipe is arranged below the drawing plate corresponding to the tray where the light diesel drawing-out opening is positioned and above the drawing plate corresponding to the tray where the heavy diesel drawing-out opening is positioned, and the diesel circulating reflux device is connected with the reflux distribution pipe;
the upper part of the heavy and light diesel oil stripping tower is connected with the heavy and light diesel oil extraction port;
the upper part of the light diesel stripping tower is connected with the light diesel extraction port;
the fractionating tower top circulating reflux device is respectively connected with an inlet and an outlet of the fractionating tower top circulating reflux device;
and the circulating reflux device in the fractionating tower is respectively connected with the inlet and the outlet of the circulating reflux device in the fractionating tower.
2. The system for pumping light diesel oil with a specific control dry point of the catalytic or coking fractionating tower according to claim 1, wherein the diesel oil circulating reflux device is a diesel oil circulating reflux pipeline, and a heavy and light diesel oil pump and a heavy and light diesel oil heat exchanger are sequentially connected to the bottom of the heavy and light diesel oil stripping tower; the output pipeline of the heavy and light diesel oil heat exchanger is respectively connected with the diesel oil circulating reflux pipeline and the heavy and light diesel oil product output pipeline; the other end of the diesel oil circulating return pipeline is connected to the return distribution pipe.
3. The system for withdrawing a specific dry point controlled light diesel from a catalytic or coker fractionator of claim 1, wherein the diesel pumparound device is a fractionator liquid phase stream pumparound device; the fractionating tower liquid phase material flow circulating reflux device comprises a diesel oil circulating reflux pump and a diesel oil circulating reflux heat exchanger connected with the diesel oil circulating reflux pump, the diesel oil circulating reflux pump is connected with a pumping-out opening of a tray at 1-3 layers above the heavy and light diesel oil pumping-out opening, and the other end of the diesel oil circulating reflux heat exchanger is connected to the reflux distribution pipe;
the bottom of the heavy and light diesel stripping tower is sequentially connected with a heavy and light diesel pump and a heavy and light diesel heat exchanger; and the output pipeline of the heavy and light diesel oil heat exchanger is connected to the output pipeline of the heavy and light diesel oil product.
4. The system for withdrawing light diesel of a specified control dry point of a catalytic or coker fractionator of claim 1, wherein a light diesel pump, a light diesel heat exchanger, and a light diesel product outlet line are connected in series to the bottom of the light diesel stripper column.
5. The catalytic or coker fractionator system that draws a specific dry point controlled light diesel fuel of claim 1, wherein,
the overhead material flow output pipeline is a crude gasoline and rich gas mixture output pipeline;
the tower bottom material flow output pipeline is an oil slurry output pipeline;
the lower part of the light diesel stripping tower and the lower part of the light diesel stripping tower are respectively provided with a stripping steam input pipeline;
an oil-gas line of the light diesel stripping tower is arranged at the outlet of the top of the light diesel stripping tower and is connected with an oil-gas return port of the light diesel stripping tower through the oil-gas line of the light diesel stripping tower;
and an oil-gas line of the heavy and light diesel oil stripping tower is arranged at an outlet at the top of the heavy and light diesel oil stripping tower and is connected with an oil-gas return port of the heavy and light diesel oil stripping tower through the oil-gas line of the heavy and light diesel oil stripping tower.
6. The catalytic or coker fractionator system that draws a specific dry point controlled light diesel fuel of claim 1, wherein,
the fractionating tower top circulating reflux device comprises a tower top circulating reflux pump and a tower top circulating reflux heat exchanger and is used for controlling the dry point of the tower top crude gasoline;
the circulating reflux device in the fractionating tower comprises a circulating reflux pump in the fractionating tower and a circulating reflux heat exchanger in the fractionating tower, and is used for controlling the dry point of the heavy and light diesel oil product.
7. The system for extracting light diesel oil with specific control dry points in a catalytic or coking fractionation tower according to claim 1, wherein the extraction plate corresponding to the tray where the light diesel oil extraction port is located is a full extraction hopper or a half extraction hopper.
8. The system for stripping light diesel fuel of specific control dry point of a catalytic or coker fractionator of any one of claims 1-7, wherein the number of trays in the fractionator is from 30 to 34 blocks.
9. A method for extracting light diesel oil with specific control dry point by a catalytic or coking fractionating tower, which is characterized in that the method adopts a system for extracting light diesel oil with specific control dry point by the catalytic or coking fractionating tower as described in any one of claims 1,2,4-8, and comprises the following steps:
part of the heavy and light diesel oil liquid phase material flow which is extracted from the heavy and light diesel oil extraction port and stripped by the heavy and light diesel oil stripping tower is taken as liquid phase material flow to circularly flow back, and enters the reflux distribution pipe through the diesel oil circulating reflux device, the gas phase temperature under the extraction plate corresponding to the tower tray where the light diesel oil extraction port is positioned is controlled, the dry point of a light diesel oil product is further controlled, and other parts of heavy and light diesel oil liquid phase material flow are taken as the heavy and light diesel oil product;
and (3) stripping the light diesel liquid phase extracted from the light diesel oil extraction port by the light diesel oil stripping tower to obtain the light diesel oil product.
10. A method for extracting light diesel oil with specific control dry point by a catalytic or coking fractionating tower, which is characterized in that the method adopts a system for extracting light diesel oil with specific control dry point by the catalytic or coking fractionating tower of any one of claims 1,3-8, and comprises the following steps:
taking liquid phase material flows extracted from extraction openings of trays on 1-3 layers above the heavy and light diesel oil extraction opening as liquid phase material flows to circularly flow back, and sequentially enter the reflux distribution pipe through the diesel oil circulating reflux device, controlling the gas phase temperature under an extraction plate corresponding to the tray where the light diesel oil extraction opening is positioned, and further controlling the dry point of a light diesel oil product;
the heavy and light diesel oil liquid phase material extracted from the heavy and light diesel oil extraction port is subjected to steam stripping by the heavy and light diesel oil stripping tower to obtain a heavy and light diesel oil product;
and (3) stripping the light diesel liquid phase material pumped out from the light diesel oil pumping-out port by the light diesel oil stripping tower to obtain the light diesel oil product.
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| CN202110814239.2A CN115637164A (en) | 2021-07-19 | 2021-07-19 | Method and system for pumping light diesel oil with specific control dry point by catalytic or coking fractionating tower |
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| CN202110814239.2A CN115637164A (en) | 2021-07-19 | 2021-07-19 | Method and system for pumping light diesel oil with specific control dry point by catalytic or coking fractionating tower |
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