Condensed oil delivery and recovery system

Abstract

The utility model relates to the technical field of petroleum product processing, in particular to a condensed oil delivery and recovery system which comprises a condensed oil storage tank, the condensed oil storage tank is respectively connected with a nitrogen blowing pipeline and a delivery pipeline, the nitrogen blowing pipeline is provided with a nitrogen flow valve, the delivery pipeline is connected with a fractionating tower top return tank, and the fractionating tower top return tank is provided with a nitrogen outlet. The fractionating tower top reflux tank is sequentially connected with the compressor and the liquid separation tank through a first gas phase pipeline and is connected with the absorption tower through a first liquid phase pipeline; the liquid separation tank is connected with the absorption tower through a second gas phase pipeline and is connected with the desorption tower through a second liquid phase pipeline; the desorption tower is connected with the absorption tower through a third gas phase pipeline and is connected with the stabilization tower through a third liquid phase pipeline; and the absorption tower is respectively connected with a tower top gas phase pipeline and a tower bottom liquid phase collecting device. According to the utility model, condensed oil can be subjected to stage treatment to obtain petroleum products of different grades, light hydrocarbon components in the condensed oil are prevented from being directly discharged into the atmosphere, the operation safety of the system is improved, and the resource utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum product processing, in particular to a condensed oil delivery and recovery system. Background Art

[0002] In petroleum refining and chemical industry, condensate oil is a liquid organic byproduct formed by condensation of heavy components in rich gas. The main components of condensate oil include gasoline, liquefied gas, C3 to C8 alkanes and olefins, and a small amount of C1 and C2 components. It is an organic mixture containing multiple light hydrocarbon components.

[0003] In the prior art, the condensate oil treatment method is generally to pump the condensate oil to a desulfurization tower for desulfurization through a condensate oil pump, and then further transport it to a light oil tank area for further catalytic purification, impurity removal and refining, and finally realize the recycling of the condensate oil. However, during the pumping of the condensate oil, due to the phenomenon of frictional heating during the transportation process and the long transportation pipeline process, some light hydrocarbon components in the condensate oil are easily gasified, which may cause the condensate oil pump to be emptied and the pressure fluctuations in the condensate oil storage tank and pipeline.

[0004] In order to prevent excessive fluctuations in the air pressure in the condensate storage tank and pipeline during the condensate pumping process, the existing treatment method is to install a breathing valve on the condensate storage tank to discharge the gaseous components when the air pressure is too high. However, using a breathing valve to release a portion of the vaporized light hydrocarbons will, on the one hand, reduce the utilization rate of the organic components in the condensate, especially the light hydrocarbons cannot be effectively utilized; on the other hand, frequent discharge of light hydrocarbons will cause the VOCs concentration on site to increase, posing a pollution risk and a major safety hazard. Utility Model Content

[0005] In view of the problem that the prior art method of installing a breathing valve on the condensed oil storage tank to discharge gaseous components leads to a reduced utilization rate of the condensed oil, the light hydrocarbons cannot be effectively utilized, and there are pollution risks and safety hazards, the utility model provides a condensed oil delivery and recovery system, which can grade the condensed oil into different grades of petroleum products, avoid direct discharge of light hydrocarbon components in the condensed oil into the atmosphere, improve the safety of system operation, and at the same time greatly improve the recovery rate of light hydrocarbon components in the condensed oil, thereby improving resource utilization.

[0006] The technical solution of the utility model is as follows:

[0007] A condensed oil delivery and recovery system comprises a condensed oil storage tank, the condensed oil storage tank is respectively connected to a nitrogen blowing pipeline and an external delivery pipeline, the nitrogen blowing pipeline is provided with a nitrogen flow valve, the external delivery pipeline is connected to a fractionation tower top reflux tank, the fractionation tower top reflux tank is respectively connected to a first gas phase pipeline and a first liquid phase pipeline, the first liquid phase pipeline is connected to an absorption tower, and the first gas phase pipeline is sequentially connected to a compressor and a liquid separator;

[0008] The liquid separation tank is connected to the second gas phase pipeline and the second liquid phase pipeline respectively, the second gas phase pipeline is connected to the absorption tower, and the second liquid phase pipeline is connected to the analytical tower;

[0009] The analysis tower is connected to the third gas phase pipeline and the third liquid phase pipeline respectively, the third gas phase pipeline is connected to the absorption tower, and the third liquid phase pipeline is connected to the stabilization tower;

[0010] The absorption tower is connected to the gas phase pipeline at the top of the tower and the liquid phase collecting device at the bottom of the tower respectively.

[0011] Furthermore, a liquid level gauge is provided in the condensed oil storage tank to monitor the liquid level of the condensed oil in the condensed oil storage tank.

[0012] Furthermore, a first barometer is provided in the reflux tank at the top of the fractionation tower to monitor the gas pressure in the reflux tank at the top of the fractionation tower.

[0013] Furthermore, it also includes a gas-liquid regulating module, in which a controller is arranged, the gas-liquid regulating module is respectively connected to the liquid level meter and the first barometer signal, the gas-liquid regulating module is controlled and connected to the nitrogen flow valve, and the flow of the nitrogen flow valve can be adjusted according to the readings of the liquid level meter and the first barometer to prevent the liquid level in the condensed oil storage tank from being too high or too low, which may have an adverse effect on the condensed oil delivery recovery system, and at the same time avoid safety hazards caused by excessive gas pressure in the reflux tank at the top of the distillation tower.

[0014] Furthermore, a second barometer is provided in the liquid separation tank to monitor the air pressure in the liquid separation tank.

[0015] Furthermore, it also includes a compressor adjustment module, in which a controller is provided, the compressor adjustment module is connected to the second barometer signal, the compressor adjustment module is connected to the compressor control, and the power of the compressor can be adjusted according to the reading of the second barometer.

[0016] Furthermore, the gas outlet of the stabilization tower is connected to the first desulfurization device and the liquefied gas pipeline in sequence, and the liquid outlet of the stabilization tower is connected to the stabilized gasoline collecting device. The gas phase discharged from the gas outlet of the stabilization tower can be sold or used as liquefied gas after desulfurization by the desulfurization device, and the liquid phase discharged from the liquid outlet of the stabilization tower can be directly sold or used as stabilized gasoline.

[0017] Furthermore, the tower top gas phase pipeline is connected to the second desulfurization device, and the main organic components of the gas phase discharged from the tower top gas phase pipeline are C1 and C2, which can be sold or used as a fuel gas product after desulfurization by the desulfurization device.

[0018] Furthermore, insulation layers are provided outside the external delivery pipeline, the first gas phase pipeline, the first liquid phase pipeline, the second gas phase pipeline, the second liquid phase pipeline, the third liquid phase pipeline, the third gas phase pipeline and the top gas phase pipeline to prevent the materials transported in the pipeline from freezing due to the low temperature in winter.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a condensed oil delivery and recovery system, which delivers the condensed oil in the condensed oil storage tank to the reflux tank on the top of the distillation tower through nitrogen pressure, and the light hydrocarbon components in the condensed oil can be fully separated into gas-liquid two phases in the larger space of the reflux tank on the top of the reflux tower, and the gas-liquid two phases are further processed respectively through subsequent connected devices, and finally the condensed oil is processed into petroleum products of different grades, so that the light hydrocarbon components in the condensed oil are avoided from being directly discharged into the atmosphere to cause pollution and potential safety hazards, thereby improving the safety of system operation, and at the same time greatly improving the recovery rate of the light hydrocarbon components in the condensed oil and improving the resource utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the condensed oil delivery and recovery system in Example 1.

[0023] In the figure, 1-condensed oil storage tank, 11-nitrogen blowing pipeline, 12-external delivery pipeline, 2-distillation tower top reflux tank, 21-first gas phase pipeline, 22-first liquid phase pipeline, 23-compressor, 3-liquid separation tank, 31-second gas phase pipeline, 32-second liquid phase pipeline, 4-analysis tower, 41-third gas phase pipeline, 42-third liquid phase pipeline, 5-stabilization tower, 51-first desulfurization device, 52-liquefied gas pipeline, 53-stabilized gasoline collection device, 6-absorption tower, 61-tower top gas phase pipeline, 62-tower bottom liquid phase collection device, 63-second desulfurization device. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] Example 1

[0026] A condensed oil delivery and recovery system comprises a condensed oil storage tank 1, a liquid level gauge is arranged in the condensed oil storage tank 1, the condensed oil storage tank 1 is respectively connected to a nitrogen blowing pipeline 11 and an external delivery pipeline 12, the nitrogen blowing pipeline 11 is provided with a nitrogen flow valve, the external delivery pipeline 12 is connected to a fractionation tower top reflux tank 2, a first barometer is arranged in the fractionation tower top reflux tank 2, the fractionation tower top reflux tank 2 is respectively connected to a first gas phase pipeline 21 and a first liquid phase pipeline 22, the first liquid phase pipeline 22 is connected to an absorption tower 6, and the first gas phase pipeline 21 is sequentially connected to a compressor 23 and a liquid separator 3;

[0027] A second barometer is arranged in the liquid separator 3, and the liquid separator 3 is connected to the second gas phase pipeline 31 and the second liquid phase pipeline 32 respectively, the second gas phase pipeline 31 is connected to the absorption tower 6, and the second liquid phase pipeline 32 is connected to the analytical tower 4;

[0028] The analysis tower 4 is connected to the third gas phase pipeline 41 and the third liquid phase pipeline 42 respectively, the third gas phase pipeline 41 is connected to the absorption tower 6, the third liquid phase pipeline 42 is connected to the stabilization tower 5, the gas outlet of the stabilization tower 5 is connected to the first desulfurization device 51 and the liquefied gas pipeline 52 in sequence, and the liquid outlet of the stabilization tower 51 is connected to the stable gasoline collection device 53;

[0029] The absorption tower 6 is connected to a tower top gas phase pipeline 61 and a tower bottom liquid phase collecting device 62 respectively, and the tower top gas phase pipeline 61 is connected to a second desulfurization device 63 .

[0030] The external delivery pipeline 12, the first gas phase pipeline 21, the first liquid phase pipeline 22, the second gas phase pipeline 31, the second liquid phase pipeline 32, the third gas phase pipeline 41, the third liquid phase pipeline 42 and the tower top gas phase pipeline 61 are all provided with a heat preservation layer;

[0031] It also includes a gas-liquid regulating module and a compressor regulating module, in which controllers are respectively provided, the gas-liquid regulating module is respectively connected to the liquid level meter and the first barometer signal, the gas-liquid regulating module is connected to the nitrogen flow valve control; the compressor regulating module is connected to the second barometer signal, and the compressor regulating module is connected to the compressor control.

[0032] The operating principle of Example 1 is:

[0033] (1) The condensed oil is stored in the condensed oil storage tank 1. When the liquid level gauge in the condensed oil storage tank 1 shows that the liquid storage volume exceeds 70%, the nitrogen blowing pipeline 11 is opened, and the condensed oil is blown into the reflux tank 2 at the top of the distillation tower through the external delivery pipeline 12 using nitrogen;

[0034] (2) The condensed oil is separated into a first liquid phase and a first gas phase in the reflux tank 2 at the top of the fractionation tower. The first liquid phase is sent to the absorption tower as an absorbent through the first liquid phase pipeline 22. The first gas phase enters the compressor 23 for compression and then is sent to the liquid separator 3 to be separated into a second liquid phase and a second gas phase. The second gas phase is sent to the absorption tower 6 through the second gas phase pipeline 31. The second liquid phase is sent to the desorption tower 4 through the second liquid phase pipeline 32.

[0035] (3) The second liquid phase is distilled and separated into a third liquid phase and a third gas phase in the analysis tower 4. The third gas phase is sent to the absorption tower 6 through the third gas phase pipeline 41, and the third liquid phase is sent to the stabilization tower 5 through the third liquid phase pipeline 42.

[0036] (4) The third liquid phase is separated into liquefied gas and stabilized gasoline in the stabilization tower 5. The liquefied gas is desulfurized by the first desulfurization device 51 and enters the liquefied gas pipeline 52; the stabilized gasoline enters the stabilized gasoline collection device 53;

[0037] (5) The first liquid phase in the absorption tower 6 is mixed with the second gas phase and the third gas phase. The heavy hydrocarbon components in the second gas phase and the third gas phase are absorbed by the first liquid phase and are finally separated into top gas and top liquid phase components. The top gas passes through the top gas phase pipeline 61 and enters the second desulfurization device 63 for desulfurization to finally obtain fuel gas. The main organic components of the fuel gas are C1 and C2. The bottom liquid phase components enter the bottom liquid phase collection device 62 and are recycled as crude gasoline.

[0038] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A condensed oil delivery and recovery system, comprising a condensed oil storage tank, characterized in that: The condensed oil storage tank is connected to the nitrogen blowing pipeline and the external delivery pipeline respectively, the nitrogen blowing pipeline is provided with a nitrogen flow valve, the external delivery pipeline is connected to the reflux tank at the top of the fractionation tower, the reflux tank at the top of the fractionation tower is connected to the first gas phase pipeline and the first liquid phase pipeline respectively, the first liquid phase pipeline is connected to the absorption tower, and the first gas phase pipeline is connected to the compressor and the liquid separator in sequence; The liquid separation tank is connected to the second gas phase pipeline and the second liquid phase pipeline respectively, the second gas phase pipeline is connected to the absorption tower, and the second liquid phase pipeline is connected to the analytical tower; The analysis tower is connected to the third gas phase pipeline and the third liquid phase pipeline respectively, the third gas phase pipeline is connected to the absorption tower, and the third liquid phase pipeline is connected to the stabilization tower; The absorption tower is connected to the gas phase pipeline at the top of the tower and the liquid phase collecting device at the bottom of the tower respectively.

2. The condensed oil delivery and recovery system according to claim 1, characterized in that: A liquid level gauge is arranged in the condensed oil storage tank, and a first barometer is arranged in the reflux tank at the top of the distillation tower.

3. The condensed oil delivery and recovery system according to claim 2, characterized in that: It also includes a gas-liquid regulating module, in which a controller is arranged, the gas-liquid regulating module is respectively connected to the liquid level meter and the first barometer signal, and the gas-liquid regulating module is control-connected to the nitrogen flow valve.

4. The condensed oil delivery and recovery system according to claim 1, characterized in that: A second barometer is provided in the separatory tank.

5. The condensed oil delivery and recovery system according to claim 4, characterized in that: It also includes a compressor adjustment module, in which a controller is provided, the compressor adjustment module is connected to the second barometer signal, and the compressor adjustment module is connected to the compressor control.

6. The condensed oil delivery and recovery system according to claim 1, characterized in that: The gas outlet of the stabilization tower is connected to the first desulfurization device and the liquefied gas pipeline in sequence, and the liquid outlet of the stabilization tower is connected to the stabilization gasoline collection device.

7. The condensed oil delivery and recovery system according to claim 1, characterized in that: The gas phase pipeline at the top of the tower is connected to the second desulfurization device.

8. The condensed oil delivery and recovery system according to claim 1, characterized in that: The external delivery pipeline, the first gas phase pipeline, the first liquid phase pipeline, the second gas phase pipeline, the second liquid phase pipeline, the third liquid phase pipeline, the third gas phase pipeline and the tower top gas phase pipeline are all provided with insulation layers.

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