A slurry oil temperature control device for a fractionation tower

Abstract

The invention discloses an oil slurry temperature control device for a fractionation tower, belonging to the field of petroleum equipment. In the device, the inlet of a circulating oil slurry pump is connected to the bottom of a target fractionation tower; the inlet of a steam generator is connected to the outlet of a circulating oil slurry pump; the outlet of a steam generator is connected to the inlets of upper and lower return tower pipelines; the upper return tower oil slurry flow control component is arranged on the upper return tower pipeline, and its outlet is connected to the upper inlet of the fractionation tower; the lower return tower oil slurry flow control component and a heat exchanger are arranged on the lower return tower pipeline, and its outlet is connected to the lower inlet of the fractionation tower; the first bypass temperature control regulating valve is arranged on the first bypass temperature control pipeline, and its inlet is connected to the inlet of the steam generator, and its outlet is connected to the upper return tower pipeline; the second bypass temperature control regulating valve is arranged on the second bypass temperature control pipeline, and its inlet and outlet are respectively connected to the inlet and outlet of the heat exchanger; the main temperature control regulating valve is arranged on the outlet pipeline of the heat exchanger. The device can independently control the upper temperature of the herringbone baffle of the fractionation tower and the tower bottom temperature.

Description

Technical Field

[0001] The invention relates to the field of petroleum equipment, in particular to an oil slurry temperature control device for a fractionation tower. Background Art

[0002] For a fractionation tower, such as a catalytic cracking fractionation tower, after the reaction oil and gas enter the tower, it is necessary to use oil slurry reflux to desuperheat and wash the catalyst powder. The bottom temperature of the catalytic cracking fractionation tower must be strictly controlled, otherwise coking will occur. Therefore, it is very necessary to provide a bottom temperature control device for a catalytic cracking fractionation tower.

[0003] At present, the circulating oil slurry after leaving the tower is cooled by the heat exchanger and divided into two paths, the flow rate of the upper and lower return towers is controlled by the flow regulating valve. For example, when the tower bottom temperature rises, in order to reduce the tower bottom temperature, it is necessary to increase the flow rate of the lower return tower oil slurry, otherwise it will cause the tower bottom temperature to rise and the tower bottom is prone to coking.

[0004] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0005] Due to the flow limitation of the circulating slurry pump at the bottom of the distillation tower, the flow rate of the upper return tower will be reduced, the temperature at the herringbone baffle will rise, the catalyst carried in the oil and gas cannot be fully washed, and the lower internal parts of the distillation tower are prone to coking. Summary of the invention

[0006] In view of this, the present invention provides an oil slurry temperature control device for a distillation tower, which can solve the above technical problems.

[0007] Specifically, the following technical solutions are included:

[0008] A slurry oil temperature control device for a fractionating tower, wherein the fractionating tower has a herringbone baffle, and the device comprises: a circulating slurry oil pump, a steam generator, a heat exchanger, a first bypass temperature control regulating valve, a second bypass temperature control regulating valve, a main temperature control regulating valve, an upper return tower slurry oil flow control component, a lower return tower slurry oil flow control component, a first bypass temperature control pipeline, and a second bypass temperature control pipeline;

[0009] The inlet of the circulating oil slurry pump is connected to the bottom outlet of the target fractionation tower through a pipeline;

[0010] The inlet of the steam generator is connected to the outlet of the circulating oil slurry pump through a pipeline;

[0011] The outlet of the steam generator is connected to the inlet of the upper return tower pipeline and the lower return tower pipeline at the same time;

[0012] The upper return tower oil slurry flow control component is arranged on the upper return tower pipeline, and the outlet of the upper return tower pipeline is connected to the upper inlet of the target fractionation tower;

[0013] The lower return tower oil slurry flow control component and the heat exchanger are arranged on the lower return tower pipeline, and the outlet of the lower return tower pipeline is connected to the lower inlet of the target fractionation tower;

[0014] The first bypass temperature control regulating valve is arranged on the first bypass temperature control pipeline, and the inlet of the first bypass temperature control pipeline is connected with the inlet of the steam generator, and the outlet is connected with the upper return tower pipeline;

[0015] The second bypass temperature control regulating valve is arranged on the second bypass temperature control pipeline, and the inlet and outlet of the second bypass temperature control pipeline are respectively connected with the inlet and outlet of the heat exchanger;

[0016] The main temperature control regulating valve is arranged on the outlet pipeline of the heat exchanger.

[0017] In a possible implementation, the upper return tower oil slurry flow control component includes: an upper return tower oil slurry flow meter and an upper return tower oil slurry flow regulating valve.

[0018] In a possible implementation, the upper return tower oil slurry flow meter is located upstream of the upper return tower oil slurry flow regulating valve.

[0019] In a possible implementation, the lower return tower oil slurry flow control component includes: a lower return tower oil slurry flow meter and a lower return tower oil slurry flow regulating valve.

[0020] In a possible implementation, the lower return tower oil slurry flow meter is located upstream of the lower return tower oil slurry flow regulating valve.

[0021] In a possible implementation, a cooling medium circulates in the heat exchanger, and the cooling medium is catalytic feedstock oil.

[0022] In a possible implementation, the device further includes a first temperature controller, which is used to measure the temperature of the upper part of the herringbone baffle in the target distillation tower and control the first bypass temperature control valve according to the temperature of the upper part of the herringbone baffle.

[0023] In a possible implementation, the first temperature controller is also electrically connected to a main control platform in a central control room, and is used to transmit a measured temperature signal to the main control platform, which is then displayed by the main control platform.

[0024] In a possible implementation, the device further includes a second temperature controller, which is used to measure the bottom temperature of the target distillation tower and control the main temperature control regulating valve and the second bypass temperature control regulating valve according to the bottom temperature.

[0025] In a possible implementation, the second temperature controller is also electrically connected to a main control platform in the central control room, and is used to transmit the measured temperature signal to the main control platform, and the main control platform displays it.

[0026] The beneficial effects of the technical solution provided by the embodiment of the present invention include at least:

[0027] The oil slurry temperature control device for a fractionating tower provided by an embodiment of the present invention, when used, the circulating oil slurry is extracted from the bottom outlet of the fractionating tower, and is pumped to the steam generator by the circulating oil slurry pump for cooling. After the circulating oil slurry is cooled by steam, it is divided into two paths, and enters the upper return tower pipeline and the lower return tower pipeline respectively. Among them, the cooling oil slurry entering the upper return tower pipeline is adjusted by the upper return tower oil slurry flow control component and enters the upper part of the herringbone baffle in the fractionating tower from the upper inlet of the target fractionating tower. In this process, the first bypass temperature control regulating valve arranged on the first bypass temperature control pipeline adjusts the temperature of the upper return tower oil slurry by adjusting the flow of the upper return tower oil slurry, thereby realizing the control of the upper temperature of the herringbone baffle in the fractionating tower. The cooling oil slurry entering the lower return tower pipeline enters the bottom of the fractionating tower from the lower inlet of the target fractionating tower through the lower return tower oil slurry flow control component. In this process, a heat exchanger is separately arranged to significantly cool the lower return tower oil slurry, thereby realizing the control of the bottom temperature of the fractionating tower. Since the main temperature control regulating valve is arranged on the outlet pipeline of the heat exchanger, and the second bypass temperature control regulating valve is arranged on the second bypass temperature control pipeline, and the inlet and outlet of the second bypass temperature control pipeline are respectively connected with the inlet and outlet of the heat exchanger, the flow rate of the cooling medium entering the heat exchanger can be adjusted by the main temperature control regulating valve and the second bypass temperature control regulating valve, and the temperature control of the oil slurry in the lower return tower can be realized efficiently and sensitively. It can be seen that the oil slurry temperature control device for the distillation tower provided by the embodiment of the present invention can independently control the upper temperature of the herringbone baffle of the distillation tower, the bottom temperature of the distillation tower, the flow rate and temperature of the oil slurry in the upper return tower, and the flow rate and temperature of the oil slurry in the lower return tower, so as to ensure the desuperheating of oil and gas and the washing effect of catalyst, and prevent the coking at the bottom of the distillation tower, significantly reduce the difficulty of adjusting the oil slurry temperature at the bottom of the distillation tower, and at the same time, improve the control sensitivity of the bottom temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic structural diagram of an oil slurry temperature control device for a distillation tower is provided for an embodiment of the present invention.

[0030] The reference numerals represent:

[0031] 1- circulating oil slurry pump, 2- steam generator, 3- heat exchanger, 4- first bypass temperature control valve,

[0032] 5- Second bypass temperature control valve, 6- Main circuit temperature control valve, 7- Return tower oil slurry flow control assembly,

[0033] 71-upper return tower oil slurry flow meter, 72-upper return tower oil slurry flow regulating valve,

[0034] 8-lower return tower oil slurry flow control component, 81-lower return tower oil slurry flow meter,

[0035] 82-lower return tower oil slurry flow regulating valve, 9-first bypass temperature control pipeline, 10-second bypass temperature control pipeline,

[0036] 11-upper return pipeline, 12-lower return pipeline, 13-first temperature controller,

[0037] 14-second temperature controller, M-distillation tower, N-herringbone baffle. DETAILED DESCRIPTION

[0038] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] It should be noted that, in the embodiments of the present invention, the distillation tower involved includes but is not limited to a catalytic cracking distillation tower.

[0040] The embodiment of the present invention provides an oil slurry temperature control device for a fractionation tower, wherein the fractionation tower M has a herringbone baffle N, as shown in the attached Figure 1 As shown, the device includes: a circulating oil slurry pump 1, a steam generator 2, a heat exchanger 3, a first bypass temperature control regulating valve 4, a second bypass temperature control regulating valve 5, a main line temperature control regulating valve 6, an upper return tower oil slurry flow control component 7, a lower return tower oil slurry flow control component 8, a first bypass temperature control pipeline 9, and a second bypass temperature control pipeline 10.

[0041] Wherein, the inlet of the circulating oil slurry pump 1 is connected to the bottom outlet of the target distillation tower M through a pipeline;

[0042] The inlet of the steam generator 2 is connected to the outlet of the circulating oil slurry pump 1 through a pipeline;

[0043] The outlet of the steam generator 2 is connected to the inlet of the upper return tower pipeline 11 and the lower return tower pipeline 12 at the same time;

[0044] The upper return tower oil slurry flow control assembly 7 is arranged on the upper return tower pipeline 11, and the outlet of the upper return tower pipeline 11 is connected to the upper inlet of the target fractionation tower M;

[0045] The lower return tower oil slurry flow control assembly 8 and the heat exchanger 3 are arranged on the lower return tower pipeline 12, and the outlet of the lower return tower pipeline 12 is connected to the lower inlet of the target fractionation tower M;

[0046] The first bypass temperature control regulating valve 4 is arranged on the first bypass temperature control pipeline 9, and the inlet of the first bypass temperature control pipeline 9 is connected with the inlet of the steam generator 2, and the outlet is connected with the upper return tower pipeline 11;

[0047] The second bypass temperature control regulating valve 5 is arranged on the second bypass temperature control pipeline 10, and the inlet and outlet of the second bypass temperature control pipeline 10 are respectively connected with the inlet and outlet of the heat exchanger 3;

[0048] The main temperature control regulating valve 6 is arranged on the outlet pipeline of the heat exchanger 3 .

[0049] It can be understood that, in the embodiment of the present invention, the upper inlet of the target distillation tower M is located above the herringbone baffle N, and the lower inlet of the target distillation tower M is located below the herringbone baffle N and above the tower bottom.

[0050] The oil slurry temperature control device for a fractionation tower M provided in an embodiment of the present invention, when in use, the circulating oil slurry is extracted from the bottom outlet of the fractionation tower M, and is pumped to the steam generator 2 by the circulating oil slurry pump 1 for cooling. After the circulating oil slurry is cooled by steam, it is divided into two paths, and enters the upper return tower pipeline 11 and the lower return tower pipeline 12 respectively. Among them, the cooled oil slurry entering the upper return tower pipeline 11 is adjusted in flow by the upper return tower oil slurry flow control component 7, and then enters the upper part of the herringbone baffle N in the fractionation tower M through the upper inlet of the target fractionation tower M. In this process, the first bypass temperature control valve 4 arranged on the first bypass temperature control pipeline 9 adjusts the temperature of the upper return tower oil slurry by adjusting the flow of the upper return tower oil slurry, thereby realizing the control of the upper temperature of the herringbone baffle in the fractionation tower M. The cooled oil slurry entering the lower return tower pipeline 12 enters the bottom of the fractionation tower M from the lower inlet of the target fractionation tower M through the lower return tower oil slurry flow control component 8. In this process, a heat exchanger 3 is separately provided to significantly cool the lower return tower oil slurry, thereby realizing the control of the bottom temperature of the fractionation tower M. Since the main temperature control regulating valve 6 is arranged on the outlet pipeline of the heat exchanger 3, and at the same time, the second bypass temperature control regulating valve 5 is arranged on the second bypass temperature control pipeline 10, and the inlet and outlet of the second bypass temperature control pipeline 10 are respectively connected to the inlet and outlet of the heat exchanger 3, the flow of the cooling medium entering the heat exchanger 3 can be adjusted by the main temperature control regulating valve 6 and the second bypass temperature control regulating valve 5, so that the temperature control of the lower return tower oil slurry can be realized efficiently and sensitively. It can be seen that the oil slurry temperature control device for the distillation tower M provided in the embodiment of the present invention can independently control the upper temperature of the herringbone baffle in the distillation tower M, the bottom temperature of the distillation tower M, the flow rate and temperature of the oil slurry returning to the upper tower, and the flow rate and temperature of the oil slurry returning to the lower tower, so that it can ensure the desuperheating of oil and gas and the catalyst washing effect, and prevent coking at the bottom of the distillation tower M, which significantly reduces the difficulty of adjusting the oil slurry temperature at the bottom of the distillation tower M, and at the same time, improves the control sensitivity of the bottom temperature.

[0051] It should be noted that the hot circulating oil slurry enters the steam generator 2 and transfers heat to the cooling medium, such as water, in the steam generator 2, so that the cooling medium is heated and converted into water vapor. During this process, the circulating oil slurry is cooled.

[0052] In the embodiment of the present invention, by setting the main temperature control regulating valve 6 on the outlet pipeline of the heat exchanger 3, and at the same time, setting the second bypass temperature control regulating valve 5 on the second bypass temperature control pipeline 10, and the inlet and outlet of the second bypass temperature control pipeline 10 are respectively connected to the inlet and outlet of the heat exchanger 3, the temperature of the lower return tower oil slurry can be sensitively controlled. The lower return tower oil slurry is temperature-controlled by the heat exchanger 3, which has high sensitivity and can quickly and effectively control the bottom temperature of the fractionation tower M. For example, when the bottom temperature needs to be lowered, the circulation flow of the cooling medium can be increased by increasing the opening of the main temperature control regulating valve 6, and at the same time, the circulation flow of the cooling medium can be ensured to remain at a high level by reducing the opening of the second bypass temperature control regulating valve 5. The main temperature control regulating valve 6 and the second bypass cooperate with each other, which can make the temperature control of the lower return tower oil slurry more sensitive and efficient, and ensure efficient control of the bottom temperature.

[0053] In the embodiment of the present invention, as shown in the attached Figure 1 As shown, the upper return tower oil slurry flow control component 7 includes: an upper return tower oil slurry flow meter 71 and an upper return tower oil slurry flow regulating valve 72. The upper return tower oil slurry flow meter 71 is used to measure the flow of the upper return tower oil slurry in real time, and the upper return tower oil slurry flow regulating valve 72 is used to control the flow of the upper return tower oil slurry to ensure that the flow of the upper return tower oil slurry remains stable. Under the premise of maintaining the stability of the upper return tower oil slurry flow, the temperature of the upper return tower oil slurry is independently adjusted by the first bypass temperature control regulating valve 4 set on the first bypass temperature control pipeline 9, thereby realizing independent control of the temperature above the herringbone baffle N in the target fractionation tower M.

[0054] The upper return tower oil slurry flow meter 71 is located upstream of the upper return tower oil slurry flow regulating valve 72 to ensure that the flow control of the upper return tower oil slurry is more timely and efficient.

[0055] In the embodiment of the present invention, as shown in the attached Figure 1 As shown, the lower return tower oil slurry flow control component 8 includes: a lower return tower oil slurry flow meter 81 and a lower return tower oil slurry flow regulating valve 82. The lower return tower oil slurry flow meter 81 is used to measure the flow of the lower return tower oil slurry in real time, and the lower return tower oil slurry flow regulating valve 82 is used to control the flow of the lower return tower oil slurry to ensure that the flow of the lower return tower oil slurry remains stable. Under the premise of maintaining the stability of the lower return tower oil slurry flow, the main line temperature control regulating valve 6 is set on the outlet pipeline of the heat exchanger 3, and the second bypass temperature control regulating valve 5 is set on the second bypass temperature control pipeline 10 to achieve sensitive control of the temperature of the lower return tower oil slurry.

[0056] The lower return tower oil slurry flow meter 81 is located upstream of the lower return tower oil slurry flow regulating valve 82 to ensure that the flow control of the lower return tower oil slurry is more timely and efficient.

[0057] In the embodiment of the present invention, a cooling medium circulates in the heat exchanger 3, wherein the cooling medium may be catalytic feedstock oil, in order to save costs.

[0058] It is understandable that the above cooling medium is not limited to catalytic feedstock oil, but can also be other media used in the catalytic cracking process, and can be selected based on the principle of reasonable energy use.

[0059] In order to facilitate monitoring and observing the circulation flow of the cooling medium, a flow meter may be provided on the inlet pipeline of the heat exchanger 3 .

[0060] In order to timely and effectively control the upper temperature of the herringbone baffle in the distillation tower M and the bottom temperature of the distillation tower M, the oil slurry temperature control device provided in the embodiment of the present invention also includes a first temperature controller 13 and a second temperature controller 14, wherein the first temperature controller 13 is used to measure the upper temperature of the herringbone baffle in the distillation tower M, and control the first bypass temperature control regulating valve 4 according to the upper temperature of the herringbone baffle. The first bypass temperature control regulating valve 4 adjusts the flow rate of the upper return tower oil slurry passing through it according to the operating instructions of the first temperature controller 13, and then adjusts the temperature of the upper return tower oil slurry, thereby finally realizing effective control of the upper temperature of the herringbone baffle in the distillation tower M.

[0061] The second temperature controller 14 is used to measure the bottom temperature of the distillation tower M, and control the main temperature control regulating valve 6 and the second bypass temperature control regulating valve 5 according to the bottom temperature. The main temperature control regulating valve 6 and the second bypass temperature control regulating valve 5 respectively adjust the flow rate of the cooling medium passing through them according to the operation instructions of the second temperature controller 14, and then adjust the temperature of the oil slurry returning to the lower tower, thereby finally realizing effective control of the bottom temperature of the distillation tower M.

[0062] It is understandable that the first temperature controller 13 and the second temperature controller 14 are both provided with corresponding main control circuit boards to be electrically connected to the corresponding temperature control regulating valves respectively to achieve signal control over them.

[0063] In order to realize the real-time observation of the upper temperature of the herringbone baffle in the fractionation tower M and the bottom temperature of the fractionation tower M, the first temperature controller 13 is also electrically connected to the main control platform in the central control room, and is used to transmit the measured temperature signal to the main control platform, and the main control platform displays it. The second temperature controller 14 is also electrically connected to the main control platform in the central control room, and is used to transmit the measured temperature signal to the main control platform, and the main control platform displays it.

[0064] Specifically, the main control platform has a display screen for displaying the above-mentioned temperature data.

[0065] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A slurry oil temperature control device for a fractionating tower, wherein the fractionating tower has a herringbone baffle, characterized in that: The device comprises: a circulating oil slurry pump, a steam generator, a heat exchanger, a first bypass temperature control regulating valve, a second bypass temperature control regulating valve, a main line temperature control regulating valve, an upper return tower oil slurry flow control component, a lower return tower oil slurry flow control component, a first bypass temperature control pipeline, and a second bypass temperature control pipeline; The inlet of the circulating oil slurry pump is connected to the bottom outlet of the target fractionation tower through a pipeline; The inlet of the steam generator is connected to the outlet of the circulating oil slurry pump through a pipeline; The outlet of the steam generator is connected to the inlet of the upper return tower pipeline and the lower return tower pipeline at the same time; The upper return tower oil slurry flow control component is arranged on the upper return tower pipeline, and the outlet of the upper return tower pipeline is connected to the upper inlet of the target fractionation tower; the upper return tower oil slurry flow control component comprises: an upper return tower oil slurry flow meter and an upper return tower oil slurry flow regulating valve, the upper return tower oil slurry flow meter is used to measure the flow of the upper return tower oil slurry in real time, and the upper return tower oil slurry flow regulating valve is used to control the flow of the upper return tower oil slurry to ensure that the flow of the upper return tower oil slurry remains stable; The lower return tower oil slurry flow control component and the heat exchanger are arranged on the lower return tower pipeline, and the outlet of the lower return tower pipeline is connected to the lower inlet of the target fractionation tower; The first bypass temperature control regulating valve is arranged on the first bypass temperature control pipeline, and the inlet of the first bypass temperature control pipeline is connected with the inlet of the steam generator, and the outlet is connected with the upper return tower pipeline; The second bypass temperature control regulating valve is arranged on the second bypass temperature control pipeline, and the inlet and outlet of the second bypass temperature control pipeline are respectively connected with the inlet and outlet of the heat exchanger; The main temperature control regulating valve is arranged on the outlet pipeline of the heat exchanger; the flow rate of the cooling medium entering the heat exchanger is regulated by the main temperature control regulating valve and the second bypass temperature control regulating valve; The device also includes a first temperature controller, which is used to measure the temperature of the upper part of the herringbone baffle in the target fractionation tower, and control the first bypass temperature control regulating valve according to the temperature of the upper part of the herringbone baffle, and the first bypass temperature control regulating valve adjusts the flow rate of the upper return tower oil slurry passing through the first bypass temperature control regulating valve according to the operation instruction of the first temperature controller to adjust the temperature of the upper return tower oil slurry; The device also includes a second temperature controller, which is used to measure the bottom temperature of the target distillation tower and control the main temperature control regulating valve and the second bypass temperature control regulating valve according to the bottom temperature of the tower. The main temperature control regulating valve and the second bypass temperature control regulating valve respectively adjust the flow rate of the cooling medium passing through the main temperature control regulating valve and the second bypass temperature control regulating valve according to the operation instructions of the second temperature controller to adjust the temperature of the oil slurry returning to the lower tower.

2. The oil slurry temperature control device for a fractionating tower according to claim 1, characterized in that: The upper return tower oil slurry flow meter is located upstream of the upper return tower oil slurry flow regulating valve.

3. The oil slurry temperature control device for a fractionating tower according to claim 1, characterized in that: The lower return tower oil slurry flow control component comprises: a lower return tower oil slurry flow meter and a lower return tower oil slurry flow regulating valve.

4. The oil slurry temperature control device for a fractionating tower according to claim 3, characterized in that: The lower return tower oil slurry flow meter is located upstream of the lower return tower oil slurry flow regulating valve.

5. The oil slurry temperature control device for a fractionating tower according to claim 1, characterized in that: A cooling medium circulates in the heat exchanger, and the cooling medium is catalytic raw oil.

6. The oil slurry temperature control device for a fractionating tower according to claim 1, characterized in that: The first temperature controller is also electrically connected to the main control platform in the central control room, and is used to transmit the measured temperature signal to the main control platform, which is then displayed by the main control platform.

7. The oil slurry temperature control device for a fractionating tower according to claim 1, characterized in that: The second temperature controller is also electrically connected to the main control platform in the central control room, and is used to transmit the measured temperature signal to the main control platform, which is then displayed by the main control platform.

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