Carclazyte tower oil return system and control method thereof
By designing a clay tower oil removal system and using internal control monitoring and remote control systems to automatically control nitrogen pressure and valve status, the overpressure problem of distillation towers that may occur during replacement of traditional clay towers is solved, ensuring the safe and stable operation of the system.
Patent Information
- Application Number
- CN202411914154.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-06-17
AI Technical Summary
When replacing white clay in traditional clay towers, the material needs to be replaced by nitrogen, which may cause overpressure in the distillation tower, resulting in safety risks and unqualified products.
A white clay tower oil removal system is designed, including a nitrogen main pipeline, a gas-liquid separation tank, a feed line, an oil removal inlet line and an oil removal outlet line. Through internal control monitoring and remote control systems, the nitrogen pressure and valve status are automatically controlled to ensure the smooth completion of material replacement.
The safety risk of overpressure of the distillation tower is avoided, and the long-term, continuous, stable and good operation of the oil reduction system of the clay tower is ensured, and the safety valve jump accident and product failure are avoided.
Smart Images
Figure CN120154929A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of material replacement in a clay tower, and specifically to a clay tower oil drainage system and its control method. Background Art
[0002] When replacing the clay in a traditional clay tower, the materials in the tower need to be drained into a rectification tower. The materials in the clay tower are replaced by nitrogen. Passing through the oil drainage sight glass, it enters the rectification tower together with the feed line. On-site, by observing the oil drainage sight glass, when bubbles appear in the oil drainage sight glass, the nitrogen is closed on-site, and the oil drainage valve is closed.
[0003] This operation entirely depends on on-site operators observing the oil drainage sight glass for monitoring. When the monitoring is not timely, after the gas is carried into the downstream and rushes to the rectification tower, it will cause the pressure of the rectification tower to soar. Because the rectification tower is designed with an upper limit pressure, and the nitrogen pressure is used for oil drainage, it will cause the rectification tower to be over-pressured, resulting in safety risks, such as the safety valve tripping and the products being unqualified. Summary of the Invention
[0004] In view of the defects of the prior art, the present invention provides a clay tower oil drainage system and its control method, which can complete the replacement of the clay in the clay tower only through in-house operation monitoring, avoiding the safety risk of overpressure in the rectification tower, and ensuring that the clay tower oil drainage system can operate continuously, stably, and well for a long time.
[0005] To achieve the above object, the technical solution provided by the present invention for the clay tower oil drainage system includes a first clay tower, a rectification tower, a nitrogen main pipeline, a gas-liquid separation tank, a feed line, an oil drainage inlet line, and an oil drainage outlet line; the nitrogen main pipeline is connected to the inlet of the clay tower, and a nitrogen main valve, a pressure control valve, and a pressure indicating regulator are sequentially arranged on the nitrogen main pipeline, and the pressure indicating regulator is electrically connected to the nitrogen main pipeline; the gas-liquid separation tank is provided with a float level gauge, and the float level gauge electrically controls the pressure control valve through a level remote transmitter, a level indicating regulator, and a pressure indicating regulator in sequence; the feed line is connected to the inlet of the rectification tower; one end of the oil drainage inlet line is connected to the outlet of the clay tower, and the other end is connected to the inlet of the gas-liquid separation tank; and one end of the oil drainage outlet line is connected to the bottom outlet of the gas-liquid separation tank, and the other end is connected to the feed line, and an interlock cut-off valve and a level control valve are sequentially arranged on the oil drainage outlet line; the float level gauge electrically controls the interlock cut-off valve through a level remote transmitter, a level indicating regulator, and a level indicating interlock table in sequence; the float level gauge electrically controls the level control valve through a level remote transmitter and a level indicating regulator in sequence.
[0006] Further, the nitrogen main pipeline is provided with a ventilation valve, and the ventilation valve is arranged at the front end of the pressure control valve.
[0007] Further, it also includes a second clay tower and a branch pipeline. One end of the branch pipeline is connected to the main nitrogen pipeline, and the other end of the branch pipeline is connected to the oil drainage inlet line through the second clay tower. The branch pipeline is connected in parallel with the first clay tower through the second clay tower.
[0008] Further, an oil drainage valve, a sight glass, and a check valve group are sequentially arranged on the oil drainage inlet line.
[0009] Further, it also includes a pressure relief pipeline. One end is connected to the top outlet of the gas-liquid separation tank, and the other end is connected to the flare system. A safety valve group is arranged on the pressure relief pipeline.
[0010] Further, a field pressure gauge and a remote temperature transmitter are sequentially arranged on the feed pipeline. The remote temperature transmitter is electrically connected to the feed pipeline. The joint of the oil drainage outlet line and the feed pipeline is located downstream of the remote temperature transmitter.
[0011] Further, a remote pressure gauge is electrically connected to the gas-phase outlet pipeline of the distillation column, and a temperature display and control instrument is electrically connected to the distillation column.
[0012] Further, there are two float level gauges. The first float level gauge and the second float level gauge are placed in the gas-liquid separation tank. There are two remote level transmitters, namely the first remote level transmitter and the second remote level transmitter. There are two level indicating and regulating meters, namely the first level indicating and regulating meter and the second level indicating and regulating meter.
[0013] Using the control method of the above-mentioned clay tower oil drainage system, the steps include S100. Open the ventilation valve, pressure control valve, oil drainage valve, check valve group, interlock cut-off valve, and level control valve. Set the nitrogen pressure value through the pressure indicating and regulating meter, and start to displace the materials in the first clay tower; S200. When the liquid level of the gas-liquid separation tank is 100%, control the valve position of the pressure control valve through the remote level transmitter, level indicating and regulating meter, and pressure indicating and regulating meter; S300. When the liquid level of the gas-liquid separation tank is between 100% and 10%, reduce the nitrogen pressure value and decrease the valve position of the pressure control valve through the remote level transmitter, level indicating and regulating meter, and pressure indicating and regulating meter; S400. When the liquid level of the gas-liquid separation tank is lower than 10%, control the interlock cut-off valve to close through the remote level transmitter, level indicating and regulating meter, and level indicating interlock meter, so that the liquid level in the gas-liquid separation tank rises above 10%, and always keep the liquid level in the gas-liquid separation tank above 10%; S500. After the material replacement in the first clay tower is completed, control the pressure control valve to close through the remote liquid level gauge, liquid level indicating and regulating gauge, and pressure indicating and regulating gauge; control the interlock cut-off valve to close through the remote liquid level gauge, liquid level indicating and regulating gauge, and liquid level indicating interlock gauge; control the liquid level control valve to close through the remote liquid level gauge and liquid level indicating and regulating gauge.
[0014] Further, the step further includes Simultaneously replacing the materials in the first clay tower and the second clay tower in S100.
[0015] Advantages of the present invention: During oil drainage, only the inner operator needs to monitor the DCS screen and monitor the gas-liquid separation tank in real time. When the material replacement is completed, it will automatically trigger the closing of nitrogen and valves; through this application, the safety risk of overpressure caused by gas flushing into the distillation column is avoided, and the situations such as the safety valve jumping and unqualified products are also avoided, ensuring that the oil drainage system of the clay tower can operate continuously, stably and well for a long time. Brief Description of the Drawings
[0016] Figure 1 It is the process flow diagram of the present invention; Figure 2 It is the preferred process flow diagram of the present invention; In the figure: 100, the first clay tower; 110, the second clay tower; 111, the branch pipeline, 200, the distillation column; 210, the temperature display and control instrument, 300, the gas-liquid separation tank; 310, the float liquid level gauge; 320, the first float liquid level gauge; 330, the second float liquid level gauge; 311, the remote liquid level gauge; 3111, the first remote liquid level gauge; 3112, the second remote liquid level gauge; 312, the liquid level indicating and regulating gauge; 3121, the first liquid level indicating and regulating gauge; 3122, the second liquid level indicating and regulating gauge; 313, the liquid level indicating interlock gauge, 400, the nitrogen main pipeline; 410, the ventilation valve; 420, the pressure control valve; 430, the pressure indicating and regulating gauge, 500, the oil drainage inlet pipeline; 510, the oil drainage valve; 520, the sight glass; 530, the check valve group, 600, the oil drainage outlet pipeline; 610, the interlock cut-off valve; 620, the liquid level control valve, 700, the feed pipeline; 710, the on-site pressure gauge; 720, the temperature remote transmitter, 800, the pressure relief pipeline; 810, the safety valve group; 820, the flare system, 900, the gas phase outlet pipeline; 910, the pressure remote transmitter. Detailed Embodiment
[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.
[0018] As Figure 1 shown, a clay tower oil drainage system in an embodiment of the present invention is shown, which includes a first clay tower 100, a rectifying tower 200, a nitrogen main pipeline 400, a gas-liquid separation tank 300, a feed pipeline 700, an oil drainage inlet pipeline 500, and an oil drainage outlet pipeline 600; the nitrogen main pipeline 400 is connected to the inlet of the clay tower, and a nitrogen main valve, a pressure control valve 420, and a pressure indicating regulator 430 are sequentially arranged on the nitrogen main pipeline 400, and the pressure indicating regulator 430 is electrically connected to the nitrogen main pipeline 400; the gas-liquid separation tank 300 is provided with a float level gauge 310, and the float level gauge 310 electrically controls the pressure control valve 420 through a level remote transmitter 311, a level indicating regulator 312, and the pressure indicating regulator 430 in sequence; the feed pipeline 700 is connected to the inlet of the rectifying tower 200; one end of the oil drainage inlet pipeline 500 is connected to the outlet of the clay tower, and the other end is connected to the inlet of the gas-liquid separation tank 300; and one end of the oil drainage outlet pipeline 600 is connected to the bottom outlet of the gas-liquid separation tank 300, and the other end is connected to the feed pipeline 700, and an interlock cut-off valve and a level control valve 620 are sequentially arranged on the oil drainage outlet pipeline 600; the float level gauge electrically controls the interlock cut-off valve through the level remote transmitter, the level indicating regulator, and a level indicating interlock table 313 in sequence; the float level gauge electrically controls the level control valve 620 through the level remote transmitter and the level indicating regulator in sequence.
[0019] The float level gauge in the above clay tower oil drainage system designs a gas-liquid separation remote transmission device and is equipped with an instrument control circuit; the level remote transmitter, the level indicating regulator, and the level indicating interlock table 313 connected thereto form a remote transmission interlock control system, and the interlock cut-off valve is connected to the remote transmission interlock control system; the level remote transmitter, the level indicating regulator, and the pressure indicating regulator 430 connected thereto form a pressure control system; the level remote transmitter and the level indicating regulator connected thereto form a remote transmission level control system, and the level control valve 620 is connected to the remote transmission level control system.
[0020] It should be noted that the nitrogen main pipeline 400 uses a pipeline with DN50 and 5TB; the gas-liquid separation tank 300 is designed with an operating pressure of 0.1 - 0.2 MPa and a design upper limit pressure of 0.4 MPa; the feed pipeline 700 uses a pipeline with DN35 and 2TB; the oil drainage inlet pipeline 500 uses a pipeline with DN100 and 5TB.
[0021] In one embodiment, a nitrogen main pipeline 400 is provided with a ventilation valve 410, and the ventilation valve 410 is arranged upstream of the pressure control valve 420.
[0022] In one embodiment, it further includes a second clay tower 110 and a branch pipeline 111. One end of the branch pipeline 111 is connected to the nitrogen main pipeline 400, and the other end of the branch pipeline 111 is connected to the oil return inlet line 500 through the second clay tower 110. The branch pipeline 111 is connected in parallel with the first clay tower 100 through the second clay tower 110.
[0023] In one embodiment, an oil return valve 510, a sight glass 520, and a check valve group 530 are sequentially arranged on the oil return inlet line 500.
[0024] In one embodiment, it further includes a pressure relief pipeline 800. One end is connected to the top outlet of the gas-liquid separation tank 300, and the other end is connected to the flare system 820. A safety valve group 810 is arranged on the pressure relief pipeline 800.
[0025] It should be noted that a safety valve group 810 trip device is designed on the top of the gas-liquid separation tank 300, and the trip pressure is 0.4 MPa. After the gas-liquid separation tank 300 is over-pressurized, the safety valve group 810 will trip and relieve pressure to the flare system 820 to ensure the safety and controllability of the gas-liquid separation tank 300.
[0026] In one embodiment, a field pressure gauge 710 and a temperature remote transmitter 720 are sequentially arranged on the feed line 700. The temperature remote transmitter 720 is electrically connected to the feed line 700. The joint of the oil return outlet line 600 and the feed line 700 is located downstream of the temperature remote transmitter 720.
[0027] In one embodiment, a pressure remote transmission instrument 910 is electrically connected to the gas-phase outlet pipeline 900 of the distillation column 200, and a temperature display control instrument 210 is electrically connected to the distillation column 200.
[0028] Preferably, there are two of the float level gauges 310. The first float level gauge 320 and the second float level gauge 330 are placed in the gas-liquid separation tank. There are two of the level remote transmitters 311, namely the first level remote transmitter 3111 and the second level remote transmitter 3112. There are two of the level indicating and regulating tables 312, namely the first level indicating and regulating table 3121 and the second level indicating and regulating table 3122.
[0029] See Figure 1 , adopting the control method of the above-mentioned clay tower oil return system, the steps include S100. Open the vent valve 410, the pressure control valve 420, the oil drain valve 510, the check valve group 530, the interlock cut-off valve, and the liquid level control valve 620. Set the nitrogen pressure value through the pressure indicating regulator 430, and start to displace the material in the first clay tower 100. S200. When the liquid level in the gas-liquid separation tank 300 is 100%, control the valve position of the pressure control valve 420 through the remote liquid level gauge, the liquid level indicating regulator, and the pressure indicating regulator 430. S300. When the liquid level in the gas-liquid separation tank 300 is between 100% and 10%, reduce the nitrogen pressure value through the remote liquid level gauge, the liquid level indicating regulator, and the pressure indicating regulator 430, and reduce the valve position of the pressure control valve 420. S400. When the liquid level in the gas-liquid separation tank 300 is below 10%, control the interlock cut-off valve to close through the remote liquid level gauge, the liquid level indicating regulator, and the liquid level indicating interlock table 313, so that the liquid level in the gas-liquid separation tank 300 rises above 10%, and always keep the liquid level in the gas-liquid separation tank 300 above 10%. S500. When the material replacement in the first clay tower 100 is completed, control the pressure control valve 420 to close through the remote liquid level gauge, the liquid level indicating regulator, and the pressure indicating regulator 430; control the interlock cut-off valve to close through the remote liquid level gauge, the liquid level indicating regulator, and the liquid level indicating interlock table 313; control the liquid level control valve 620 to close through the remote liquid level gauge and the liquid level indicating regulator.
[0030] Further, in the embodiment, the steps further include Simultaneously displacing the materials in the first clay tower 100 and the second clay tower 110 in S100.
[0031] A control method for an oil drain system of a clay tower, which operates in the oil drain system of the clay tower as described above; when in normal operation, open the vent valve 410, the pressure control valve 420, the oil drain valve 510, the check valve group 530, the interlock cut-off valve 610, and the liquid level control valve 620, close the safety valve group 810, introduce nitrogen into the nitrogen main pipeline 400, and control the nitrogen main pipeline 400 to set a nitrogen pressure of 0.2 MPa through the pressure indicating regulator 430; at this time, the liquid level in the clay tower drops, and the material replacement is carried out, and the material in the clay tower continuously retreats into the gas-liquid separation tank 300 with the output of nitrogen. When the liquid level in the gas-liquid separation tank 300 is 100%: Pressure control system: The float level gauge controls the remote level transmitter through electrical connection. The remote level transmitter controls the level indicating regulator. The level indicating regulator controls the pressure indicating regulator 430. The pressure indicating regulator 430 controls the automatic nitrogen pressure of 0.2 MPa in the main nitrogen pipeline 400. The pressure indicating regulator 430 further controls the valve position of the pressure control valve 420 (PID parameters need to be adjusted).
[0032] Remote level control system: The float level gauge controls the remote level transmitter through electrical connection. The remote level transmitter controls the level indicating regulator. The level indicating regulator controls the valve position of the level control valve 620 (PID parameters need to be adjusted), with an automatic flow rate of 8 - 10 t / h (the designed oil drainage flow rate in the process package).
[0033] Remote interlock control system: Normally put into use.
[0034] When the liquid level in the gas - liquid separation tank 300 is lower than 100% (higher than 10%): Pressure control system: The float level gauge controls the remote level transmitter through electrical connection. The remote level transmitter controls the level indicating regulator. The level indicating regulator controls the pressure indicating regulator 430. The pressure indicating regulator 430 controls the automatic nitrogen pressure of 0.15 MPa in the main nitrogen pipeline 400. The pressure indicating regulator 430 further controls the pressure control valve 420 with a smaller valve position (PID parameters need to be adjusted).
[0035] Remote level control system: Normally put into use.
[0036] Remote interlock control system: Normally put into use.
[0037] When the liquid level in the gas - liquid separation tank 300 is lower than 10%: Pressure control system: Normally put into use.
[0038] Remote level control system: Normally put into use.
[0039] Remote interlock control system: The float level gauge controls the remote level transmitter through electrical connection. The remote level transmitter controls the level indicating regulator. The level indicating regulator controls the level indicating interlock table 313. The level indicating interlock table 313 controls the interlock cut - off valve 610 to close; when the liquid level in the gas - liquid separation tank 300 rises above 10%, the interlock cut - off valve 610 opens and is normally put into use.
[0040] When all the materials in the clay tower are withdrawn from the clay tower, the pressure control system controls the pressure control valve 420 to close, the remote level control system controls the level control valve 620 to close, and the remote interlock control system controls the interlock cut - off valve 610 to close, finally completing the material replacement in the clay tower.
[0041] It should be noted that when the liquid level in the gas-liquid separation tank 300 is lower than 10%, there is a risk of gas entering the rectification column 200. Therefore, the liquid level in the gas-liquid separation tank 300 should always be kept above 10%.
[0042] In addition, during the operation of the entire control system, when the gas in the gas-liquid separation tank 300 is overpressured, the safety valve group 810 will automatically lift and relieve pressure to the flare system 820 to prevent damage to the gas-liquid separation tank 300.
[0043] It should be noted that the designed operating pressure of the gas-liquid separation tank 300 is 0.1 - 0.2 MPa, and the designed upper limit pressure is 0.4 MPa; the safety valve lifting device on the top of the gas-liquid separation tank 300: the designed lifting pressure is 0.4 MPa; the first floating liquid level gauge 320 and the second floating liquid level gauge 330 in the gas-liquid separation tank 300: gas-liquid remote transmission device with an attached instrument control circuit; the bottom cut-off valve of the gas-liquid separation tank 300 is connected to the remote transmission liquid level low-low interlock system; the bottom liquid level control valve 620 of the gas-liquid separation tank 300 is connected to the second liquid level remote control system.
[0044] See Figure 2 , in a preferred technical solution, the first floating liquid level gauge 320 electrically connects and controls the pressure control valve 420 through the first liquid level remote transmission meter 3111, the first liquid level indication and regulation meter 3121, and the pressure indication and regulation meter 430. The second floating liquid level gauge 330 electrically connects and controls the liquid level control valve through the second liquid level remote transmission meter 3112 and the second liquid level indication and regulation meter 3122. The first floating liquid level gauge 320 electrically connects and controls the interlock cut-off valve through the first liquid level remote transmission meter 3111 and the liquid level indication interlock meter 313. The first liquid level remote transmission meter 3111 and the second liquid level remote transmission meter 3112 are electrically connected to each other.
[0045] The interlock values of the first liquid level remote transmission meter 3111 and the second liquid level remote transmission meter 3112 are set to 10%. After meeting the two-out-of-two interlock conditions, the first liquid level remote transmission meter 3111 and the second liquid level remote transmission meter 3112 are triggered to interlock through the liquid level low-low interlock control, so as to realize the closing of the interlock cut-off valve, the pressure control valve 420, and the liquid level control valve. The first liquid level remote transmission meter 3111 is set to 70%, the second liquid level remote transmission meter 3112 is set to 70%, the flow rate is 8 - 10 tons / hour (the designed oil return amount of the process package), and the pressure indication and regulation meter 430 is set to 0.15 MPa - 0.2 MPa.
[0046] When the liquid level in the gas-liquid separation tank 300 is between 10% and 70%, the interlock cut-off valve is put into normal use; the first float liquid level gauge 320 is electrically connected through the first remote liquid level transmitter 3111, the first liquid level indicating and regulating meter 3121 and the pressure indicating and regulating meter 430 to control the pressure control valve 420 for automatic regulation; the second float liquid level gauge 330 is electrically connected through the second remote liquid level transmitter 3112 and the second liquid level indicating and regulating meter 3122 to control the liquid level control valve for automatic regulation.
[0047] When the liquid level in the gas-liquid separation tank 300 is lower than 10%, the material in the clay tower is drained, and the first float liquid level gauge 320 is electrically connected through the first remote liquid level transmitter 3111, the first liquid level indicating and regulating meter 3121 and the pressure indicating and regulating meter 430 to control the pressure control valve 420 to close; the second float liquid level gauge 330 is electrically connected through the second remote liquid level transmitter 3112 and the second liquid level indicating and regulating meter 3122 to control the liquid level control valve to close; the first float liquid level gauge 320 is electrically connected through the first remote liquid level transmitter 3111 and the liquid level indicating interlock meter 313 to control the interlock cut-off valve to close.
[0048] Put the safety valve group 810 system into use to ensure the safety and controllability of the gas-liquid separation tank 300; put the interlock cut-off interlock system into use: when the liquid levels of the first remote liquid level transmitter 3111 and the second remote liquid level transmitter 3112 are lower than 10% (two out of two) → liquid level indication interlock → the interlock cut-off valve 610 closes; put the pressure control system into use: when the liquid level of the first remote liquid level transmitter 3111 is lower than 10% → the first page liquid level indicating and regulating control → pressure indicating and regulating control → the pressure control valve 420 closes for cascade control; when the liquid level of the first remote liquid level transmitter 3111 is 70% → the first liquid level indicating and regulating control → pressure indicating and regulating control automatically to 0.2 MPa → the pressure control valve 420 controls the valve position (PID parameters need to be adjusted) for cascade control; put the liquid level control valve 620 system into use: when the second remote liquid level is 70% → the second liquid level indicating and regulating control → the liquid level control valve controls the automatic flow rate of 8 - 10 t / h (the designed oil drainage flow rate of the process package) → the liquid level control valve controls the valve position (PID parameters need to be adjusted); Open the oil drainage process of the clay tower, set the nitrogen pressure of 0.2 MPa through the pressure indicating and regulating meter 430 to displace the material in the clay tower; when the liquid level of the first remote liquid level transmitter 3111 is lower than 70%, then trigger the liquid level of the first remote liquid level transmitter 3111 lower than 70% → the first liquid level indicating and regulating meter 3121 control → the pressure indicating and regulating meter 430 control automatically to 0.15 MPa → the pressure control valve 420 controls the valve position.
[0049] In the traditional process of oil removal, it is necessary to arrange a special person on site to observe the oil removal sight glass 520. When bubbles appear, the valve is immediately closed, which requires two people to operate. There is a risk of nitrogen being introduced into the rectification tower 200, causing overpressure in the rectification tower 200. During the process, the internal operator also needs to constantly monitor the pressure change of the rectification tower 200. When removing oil through this application, only the internal operator needs to monitor the DCS screen and constantly monitor through the gas-liquid separation tank 300. When the material replacement is completed, it will automatically trigger the closing of nitrogen and the valve. By means of transformation, the safety risk of overpressure caused by gas flushing into the rectification tower 200 is avoided, and the occurrence of situations such as the safety valve popping up and unqualified products is also avoided.
[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.
[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0053] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.
Claims
1. The oil withdrawal system of the clay tower is characterized by: include The first white earth tower; Distillation tower; A nitrogen main line is connected to the inlet of the bleaching tower, and a nitrogen main valve, a pressure control valve and a pressure indicating regulator are sequentially arranged on the nitrogen main line, and the pressure indicating regulator is electrically connected to the nitrogen main line; The gas-liquid separation tank is provided with a float level gauge, which controls the pressure control valve in turn through the liquid level remote transmission meter, the liquid level indication regulating meter and the pressure indication regulating meter; A feed line connected to the inlet of the distillation tower; An oil withdrawal inlet line, one end of which is connected to the outlet of the bleaching tower, and the other end of which is connected to the inlet of the gas-liquid separation tank; and The oil withdrawal outlet line has one end connected to the bottom outlet of the gas-liquid separation tank and the other end connected to the feed line. An interlocking shut-off valve and a liquid level control valve are sequentially arranged on the oil withdrawal outlet line; the float level gauge electrically controls the interlocking shut-off valve through the liquid level remote transmission meter, the liquid level indication adjustment meter and the liquid level indication interlock meter in turn; the float level gauge electrically controls the liquid level control valve through the liquid level remote transmission meter and the liquid level indication adjustment meter in turn.
2. The white clay tower oil withdrawal system according to claim 1, characterized in that: The nitrogen main line is provided with a vent valve, and the vent valve is arranged at the front end of the pressure-controlled control valve.
3. The white clay tower oil withdrawal system according to claim 1, characterized in that: It also includes a second bleaching clay tower and a branch pipeline, one end of the branch pipeline is connected to the nitrogen main line, the other end of the branch pipeline is connected to the oil withdrawal inlet line through the second bleaching clay tower, and the branch pipeline is connected in parallel with the first bleaching clay tower through the second bleaching clay tower.
4. The white clay tower oil withdrawal system according to claim 1 is characterized in that: The oil withdrawal inlet line is provided with an oil withdrawal valve, a sight glass and a one-way valve group in sequence.
5. The white clay tower oil withdrawal system according to claim 1 is characterized in that: It also includes a pressure relief pipeline, one end of which is connected to the top outlet of the gas-liquid separation tank, and the other end is connected to the flare system. A safety valve group is arranged on the pressure relief pipeline.
6. The white clay tower oil withdrawal system according to claim 1, characterized in that: The feed line is provided with an on-site pressure gauge and a remote temperature transmitter in sequence. The remote temperature transmitter is electrically connected to the feed line. The joint between the oil withdrawal outlet line and the feed line is located downstream of the remote temperature transmitter.
7. The white clay tower oil withdrawal system according to claim 1, characterized in that: A pressure remote transmission instrument is electrically connected to the gas phase outlet pipeline of the distillation tower, and a temperature display control instrument is electrically connected to the distillation tower.
8. The white clay tower oil withdrawal system according to claim 1, characterized in that: The float level gauges include two, the first float level gauge and the second float level gauge are placed in the gas-liquid separation tank, the liquid level remote transmission meters include two, the first liquid level remote transmission meter and the second liquid level remote transmission meter, and the liquid level indication adjustment meters include two, the first liquid level indication adjustment meter and the second liquid level indication adjustment meter.
9. The control method of the bleaching tower oil withdrawal system according to any one of claims 1 to 7 is characterized in that: Steps include S100, open the vent valve, pressure control valve, oil return valve, one-way valve group, interlock cut-off valve and liquid level control valve, set the nitrogen pressure value through the pressure indicator regulator, and start replacing the material in the first clay tower; S200, when the liquid level of the gas-liquid separation tank is 100%, the valve position of the pressure-controlled control valve is controlled by the liquid level remote transmission meter, the liquid level indication regulating meter and the pressure indication regulating meter; S300, when the liquid level of the gas-liquid separation tank is between 100% and 10%, the nitrogen pressure value is reduced through the liquid level remote transmission meter, the liquid level indication adjustment meter and the pressure indication adjustment meter, and the valve position of the pressure control valve is reduced; S400, when the liquid level of the gas-liquid separation tank is lower than 10%, the interlocking cut-off valve is closed by controlling the liquid level remote transmission meter, the liquid level indication adjustment meter and the liquid level indication interlocking meter to make the liquid level in the gas-liquid separation tank rise to more than 10%, and the liquid level in the gas-liquid separation tank is always kept above 10%; S500. When the material replacement of the first kaolin tower is completed, the pressure control valve is closed by controlling the liquid level remote transmission meter, the liquid level indication regulating meter and the pressure indication regulating meter; the interlocking cut-off valve is closed by controlling the liquid level remote transmission meter, the liquid level indication regulating meter and the liquid level indication interlocking meter; the liquid level control valve is closed by controlling the liquid level remote transmission meter and the liquid level indication regulating meter.
10. The control method according to claim 9, characterized in that: The steps also include In S100, the materials in the first bleaching clay tower and the second bleaching clay tower are replaced simultaneously.