Carclazyte tower oil return system

Abstract

The utility model relates to the technical field of carclazyte tower material replacement, in particular to a carclazyte tower oil returning system which comprises a first carclazyte tower, a rectifying tower, a nitrogen main pipeline, a gas-liquid separation tank, a feeding line, an oil returning inlet line and an oil returning outlet line. The nitrogen main pipeline is connected with an inlet of the carclazyte tower, and a nitrogen main valve, a pressure control valve and a pressure indication adjusting meter are sequentially arranged on the nitrogen main pipeline; and the gas-liquid separation tank is provided with a buoy liquid level meter. The carclazyte replacement of the carclazyte tower can be completed only through internal operation monitoring, the safety risk that the rectifying tower can generate overpressure is avoided, and it is ensured that the carclazyte tower oil returning system can operate continuously, stably and well for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of white clay tower material replacement, specifically to a white clay tower oil removal system. BACKGROUND

[0002] When replacing white clay in the traditional white clay tower, the material in the tower needs to be removed to the rectifying tower, the material in the white clay tower is replaced by nitrogen, and the oil removal sight glass and the feed line enter the rectifying tower together. The site is observed through the oil removal sight glass. When bubbles appear in the oil removal sight glass, the nitrogen is turned off and the oil removal valve is closed.

[0003] This operation relies entirely on the observation of the oil removal sight glass by the site operator. If the monitoring is not timely, the gas will be brought into the downstream and rush to the rectifying tower, which will cause the pressure of the rectifying tower to surge. Because the rectifying tower is designed with an upper limit pressure and nitrogen is used for oil removal, the rectifying tower will be over-pressurized, which will cause safety risks and accidents such as the tripping of the safety valve and unqualified products. UTILITY MODEL CONTENT

[0004] In view of the defects of the prior art, the utility model provides a white clay tower oil removal system and a control method thereof, which can complete the replacement of white clay in the white clay tower through internal operation monitoring, avoid the safety risk of over-pressurization of the rectifying tower, and ensure that the white clay tower oil removal system can operate long-term, continuously, stably and well.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a technical scheme of a white clay tower oil removal system, which comprises a first white clay tower, a rectifying tower, a nitrogen main pipeline, a gas-liquid separation tank, a feed line, an oil removal inlet line and an oil removal outlet line. The nitrogen main pipeline is connected with the inlet of the white clay tower. A nitrogen total valve, a pressure control valve and a pressure indication adjustment table are sequentially arranged on the nitrogen main pipeline. The pressure indication adjustment table is electrically connected with the nitrogen main pipeline. The gas-liquid separation tank is provided with a float liquid level meter. The float liquid level meter is electrically connected with a liquid level remote transmission table, a liquid level indication adjustment table and a pressure indication adjustment table to control the pressure control valve. The feed line is connected with the inlet of the rectifying tower. One end of the oil removal inlet line is connected to the outlet of the white clay tower, and the other end is connected to the inlet of the gas-liquid separation tank. One end of the oil removal outlet line is connected to the bottom outlet of the gas-liquid separation tank, and the other end is connected to the feed line. An interlock cut-off valve and a liquid level control valve are sequentially arranged on the oil removal outlet line. The float liquid level meter is electrically connected with the liquid level remote transmission table, the liquid level indication adjustment table and the liquid level indication interlock table to control the interlock cut-off valve. The float liquid level meter is electrically connected with the liquid level remote transmission table and the liquid level indication adjustment table to control the liquid level control valve.

[0006] Further, the nitrogen main pipeline is provided with a breather valve, which is arranged in front of the pressure control valve.

[0007] Further, a second white clay tower and a branch pipeline are further included, one end of the branch pipeline is connected to the nitrogen main pipeline, the other end of the branch pipeline is connected to the oil return inlet line through the second white clay tower, and the branch pipeline is connected to the first white clay tower in parallel through the second white clay tower.

[0008] Further, an oil return valve, a sight glass and a check valve group are sequentially arranged on the oil return inlet line.

[0009] Further, a pressure relief pipeline is further included, one end of the pressure relief pipeline is connected to the top outlet of the gas-liquid separation tank, and the other end of the pressure relief pipeline is connected to a flare system, and a safety valve group is arranged on the pressure relief pipeline.

[0010] Further, a field pressure gauge and a temperature remote meter are sequentially arranged on the feed line, the temperature remote meter is electrically connected to the feed line, and a joint of the oil return outlet line and the feed line is located downstream of the temperature remote meter.

[0011] Further, a pressure remote instrument is electrically arranged on a gas phase outlet pipeline of the rectification tower, and a temperature display control instrument is electrically arranged on the rectification tower.

[0012] Further, the float level gauges include two first and second float level gauges arranged in the gas-liquid separation tank, the liquid level remote meters include two first and second liquid level remote meters, and the liquid level indication adjustment tables include two first and second liquid level indication adjustment tables.

[0013] The control method of the above-mentioned white clay tower oil return system includes the following steps.

[0014] S100, opening the vent valve, the pressure control valve, the oil return valve, the check valve group, the interlock cut-off valve and the liquid level control valve, setting the nitrogen pressure value through the pressure indication adjustment table, and starting to replace the material in the first white clay tower;

[0015] S200, when the liquid level of the gas-liquid separation tank is 100%, controlling the valve position of the pressure control valve through the liquid level remote meter, the liquid level indication adjustment table and the pressure indication adjustment table;

[0016] S300, when the liquid level of the gas-liquid separation tank is between 100% and 10%, reducing the nitrogen pressure value through the liquid level remote meter, the liquid level indication adjustment table and the pressure indication adjustment table, and reducing the valve position of the pressure control valve;

[0017] S400, when the liquid level of the gas-liquid separation tank is lower than 10%, controlling the interlock cut-off valve to be closed through the liquid level remote meter, the liquid level indication adjustment table and the liquid level indication interlock table, so that the liquid level in the gas-liquid separation tank is raised to more than 10%, and the liquid level in the gas-liquid separation tank is always kept above 10%;

[0018] S500, when the material replacement of the first white clay tower is completed, the pressure control valve is closed through the liquid level remote meter, the liquid level indication regulating meter and the pressure indication regulating meter; the interlocking cut-off valve is closed through the liquid level remote meter, the liquid level indication regulating meter and the liquid level indication interlocking meter; the liquid level control valve is closed through the liquid level remote meter and the liquid level indication regulating meter.

[0019] Further, the steps further comprise

[0020] The material of the first white clay tower and the second white clay tower is replaced simultaneously in S100.

[0021] The beneficial effects of the utility model are as follows: during oil withdrawal, only the inner operation monitoring DCS picture is needed to monitor the gas-liquid separation tank in real time, and the nitrogen gas and the valve will be automatically triggered to be closed after the material replacement is completed; the safety risk of overpressure caused by the gas rushing into the rectifying tower is avoided, the safety valve jumping accident and the product unqualified situation are avoided, and the long-term, continuous, stable and good operation of the white clay tower oil withdrawal system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The utility model process flow chart is as follows:

[0023] Figure 2 The utility model process flow chart is as follows:

[0024] In the drawing: 100, first white clay tower, 110, second white clay tower, 111, branch pipeline,

[0025] 200, rectifying tower, 210, temperature display control instrument,

[0026] 300, gas-liquid separation tank, 310, float liquid level meter, 320, first float liquid level meter, 330, second float liquid level meter, 311, liquid level remote meter, 3111, first liquid level remote meter, 3112, second liquid level remote meter, 312, liquid level indication regulating meter, 3121, first liquid level indication regulating meter, 3122, second liquid level indication regulating meter, 313, liquid level indication interlocking meter,

[0027] 400, nitrogen gas main pipeline, 410, breather valve, 420, pressure control valve, 430, pressure indication regulating meter,

[0028] 500, oil withdrawal inlet line, 510, oil withdrawal valve, 520, sight glass, 530, one-way valve group,

[0029] 600, oil withdrawal outlet line, 610, interlocking cut-off valve, 620, liquid level control valve,

[0030] 700, feed line, 710, field pressure gauge, 720, temperature remote meter,

[0031] 800, pressure relief line, 810, safety valve group, 820, flare system,

[0032] 900, gas phase outlet line, 910, pressure remote meter. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways beyond the specific embodiments described and illustrated herein, and it is therefore intended that the present application not be limited to the embodiments disclosed but will include all embodiments falling within the scope of the present application. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the application, are given by way of illustration only, since various changes and modifications within the scope of the application will become apparent to those skilled in the art from this detailed description.

[0034] As shown in Figure 1 The oil removal system of the present application comprises a first clay tower 100, a rectifying tower 200, a nitrogen main pipeline 400, a gas-liquid separation tank 300, a feed line 700, an oil removal inlet line 500, and an oil removal outlet line 600. The nitrogen main pipeline 400 is connected to the inlet of the clay tower. The nitrogen main pipeline 400 is sequentially provided with a nitrogen total valve, a pressure control valve 420, and a pressure indication adjustment table 430. The pressure indication adjustment table 430 is electrically connected to the nitrogen main pipeline 400. The gas-liquid separation tank 300 is provided with a float liquid level meter 310. The float liquid level meter 310 is electrically connected to the pressure control valve 420 through a liquid level remote meter 311, a liquid level indication adjustment table 312, and a pressure indication adjustment table 430 in sequence. The feed line 700 is connected to the inlet of the rectifying tower 200. One end of the oil removal inlet line 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. One end of the oil removal outlet line 600 is connected to the bottom outlet of the gas-liquid separation tank 300, and the other end is connected to the feed line 700. The oil removal outlet line 600 is sequentially provided with an interlock cut-off valve and a liquid level control valve 620. The float liquid level meter is electrically connected to the interlock cut-off valve through a liquid level remote meter, a liquid level indication adjustment table, and a liquid level indication interlock table 313 in sequence. The float liquid level meter is electrically connected to the liquid level control valve 620 through a liquid level remote meter and a liquid level indication adjustment table in sequence.

[0035] The float liquid level meter in the above clay tower oil removal system is designed with a gas-liquid separation remote transmission device and an instrument control circuit; a liquid level remote transmission meter, a liquid level indication regulating meter and a liquid level indication interlocking meter 313 connected therewith form a remote interlocking control system, a lockout valve connected to the remote interlocking control system; a liquid level remote transmission meter, a liquid level indication regulating meter and a pressure indication regulating meter 430 connected therewith form a pressure control system; a liquid level remote transmission meter and a liquid level indication regulating meter connected therewith form a remote liquid level control system, and a liquid level control valve 620 connected to the remote liquid level control system.

[0036] It should be noted that the nitrogen main pipeline 400 adopts a pipeline with DN50, 5TB; the gas-liquid separation tank 300 is designed to operate at a pressure of 0.1-0.2 MPa, and the upper limit pressure is 0.4 MPa; the feed line 700 adopts a pipeline with DN35, 2TB; and the oil removal inlet line 500 adopts a pipeline with DN100, 5TB.

[0037] In the embodiment, the nitrogen main pipeline 400 is provided with a vent valve 410 arranged upstream of the pressure control valve 420.

[0038] In the embodiment, a second clay tower 110 and a branch pipeline 111 are further included, one end of the branch pipeline 111 is connected to the nitrogen main pipeline 400, the other end of the branch pipeline 111 is connected to the oil removal inlet line 500 through the second clay tower 110, and the branch pipeline 111 is connected in parallel with the first clay tower 100 through the second clay tower 110.

[0039] In the embodiment, the oil removal inlet line 500 is sequentially provided with an oil removal valve 510, a sight glass 520 and a one-way valve group 530.

[0040] In the embodiment, a pressure relief pipeline 800 is further included, one end of the pressure relief pipeline 800 is connected to a top outlet of the gas-liquid separation tank 300, the other end of the pressure relief pipeline 800 is connected to a flare system 820, and a safety valve group 810 is arranged on the pressure relief pipeline 800.

[0041] It should be noted that the safety valve group 810 on the top of the gas-liquid separation tank 300 is designed as a launching device, the launching pressure is 0.4 MPa, and when the gas-liquid separation tank 300 is overpressure, the safety valve group 810 will be launched to relieve pressure to the flare system 820, thereby ensuring the safety and controllability of the gas-liquid separation tank 300.

[0042] In the embodiment, a field pressure gauge 710 and a temperature remote transmission meter 720 are sequentially arranged on the feed line 700, the temperature remote transmission meter 720 is electrically connected to the feed line 700, and a joint of an oil removal outlet line 600 and the feed line 700 is located downstream of the temperature remote transmission meter 720.

[0043] In the embodiment, the pressure remote instrument 910 is electrically connected to the gas phase outlet pipeline 900 of the rectification tower 200, and the temperature display control instrument 210 is electrically connected to the rectification tower 200.

[0044] Preferably, the float level gauge 310 includes two, a first float level gauge 320 and a second float level gauge 330, which are arranged in the gas-liquid separation tank, the liquid level remote meter 311 includes two, a first liquid level remote meter 3111 and a second liquid level remote meter 3112, and the liquid level indication adjustment meter 312 includes two, a first liquid level indication adjustment meter 3121 and a second liquid level indication adjustment meter 3122.

[0045] Referring to Figure 1 The control method of the oil displacement system of the above clay tower comprises the following steps:

[0046] S100, opening the air valve 410, the pressure control valve 420, the oil displacement valve 510, the one-way valve group 530, the interlock cut-off valve and the liquid level control valve 620, setting the nitrogen pressure value through the pressure indication adjustment meter 430, and starting to displace the materials in the first clay tower 100;

[0047] S200, when the liquid level of the gas-liquid separation tank 300 is 100%, controlling the valve position of the pressure control valve 420 through the liquid level remote meter, the liquid level indication adjustment meter and the pressure indication adjustment meter 430;

[0048] S300, when the liquid level of the gas-liquid separation tank 300 is between 100% and 10%, reducing the nitrogen pressure value through the liquid level remote meter, the liquid level indication adjustment meter and the pressure indication adjustment meter 430, and reducing the valve position of the pressure control valve 420;

[0049] S400, when the liquid level of the gas-liquid separation tank 300 is lower than 10%, controlling the interlock cut-off valve to be closed through the liquid level remote meter, the liquid level indication adjustment meter and the liquid level indication interlock meter 313, so that the liquid level in the gas-liquid separation tank 300 is raised to above 10%, and the liquid level in the gas-liquid separation tank 300 is always kept above 10%;

[0050] S500, after the displacement of the materials in the first clay tower 100 is completed, controlling the pressure control valve 420 to be closed through the liquid level remote meter, the liquid level indication adjustment meter and the pressure indication adjustment meter 430, controlling the interlock cut-off valve to be closed through the liquid level remote meter, the liquid level indication adjustment meter and the liquid level indication interlock meter 313, and controlling the liquid level control valve 620 to be closed through the liquid level remote meter and the liquid level indication adjustment meter.

[0051] Further, in the embodiment, the steps further comprise

[0052] In S100, the materials in the first clay tower 100 and the second clay tower 110 are simultaneously displaced.

[0053] A control method of a clay tower oil removal system, which is operated in a clay tower oil removal system as described above; when normally put into use, open the air valve 410, the pressure control valve 420, the oil removal valve 510, the one-way valve group 530, the interlock cut-off valve 610 and the liquid level control valve 620, the safety valve group 810 is closed, nitrogen gas is introduced into the nitrogen gas main pipeline 400, and the nitrogen gas pressure of the nitrogen gas main pipeline 400 is set to 0.2 MPa by the pressure indicating regulating table 430; at this time, the liquid level in the clay tower is lowered, the material is replaced, and the material in the clay tower continues to be removed into the gas-liquid separation tank 300 along with the output of nitrogen gas;

[0054] When the liquid level in the gas-liquid separation tank 300 is 100%:

[0055] Pressure control system: the float liquid level meter controls the liquid level remote meter through electricity, the liquid level remote meter controls the liquid level indicating regulating table, the liquid level indicating regulating table controls the pressure indicating regulating table 430, the pressure indicating regulating table 430 controls the automatic 0.2 MPa nitrogen gas pressure of the nitrogen gas main pipeline 400, and the pressure indicating regulating table 430 further controls the valve position of the pressure control valve 420 (PID parameters need to be adjusted).

[0056] Remote liquid level control system: the float liquid level meter controls the liquid level remote meter through electricity, the liquid level remote meter controls the liquid level indicating regulating table, and the liquid level indicating regulating table controls the valve position of the liquid level control valve 620 (PID parameters need to be adjusted). The automatic flow is 8-10 t / h (the oil removal flow is designed in the process package).

[0057] Remote interlock control system: normally put into use.

[0058] When the liquid level in the gas-liquid separation tank 300 is lower than 100% (higher than 10%):

[0059] Pressure control system: the float liquid level meter controls the liquid level remote meter through electricity, the liquid level remote meter controls the liquid level indicating regulating table, the liquid level indicating regulating table controls the pressure indicating regulating table 430, the pressure indicating regulating table 430 controls the automatic 0.15 MPa nitrogen gas pressure of the nitrogen gas main pipeline 400, and the pressure indicating regulating table 430 further controls the pressure control valve 420 with a smaller valve position (PID parameters need to be adjusted).

[0060] Remote liquid level control system: normally put into use.

[0061] Remote interlock control system: normally put into use.

[0062] When the liquid level in the gas-liquid separation tank 300 is lower than 10%:

[0063] Pressure control system: normally put into use.

[0064] Remote liquid level control system: normally put into use.

[0065] Remote interlocking control system: the float liquid level meter controls the liquid level remote meter, the liquid level remote meter controls the liquid level indication adjustment meter, the liquid level indication adjustment meter controls the liquid level indication interlocking meter 313, the liquid level indication interlocking meter 313 controls the interlocking cut-off valve 610 to close; when the liquid level in the gas-liquid separation tank 300 rises by more than 10%, the interlocking cut-off valve 610 opens, and the normal use is started.

[0066] When the material in the clay tower is completely withdrawn from the clay tower, the pressure control system controls the pressure control valve 420 to close, the remote liquid level control system controls the liquid level control valve 620 to close, and the remote interlocking control system controls the interlocking cut-off valve 610 to close, and finally the material replacement in the clay tower is completed.

[0067] It should be noted that when the liquid level in the gas-liquid separation tank 300 is less than 10%, there is a risk of gas entering the rectifying tower 200, so the liquid level in the gas-liquid separation tank 300 should always be maintained above 10%.

[0068] In addition, during the operation of the entire control system, when the gas in the gas-liquid separation tank 300 is over-pressured, the safety valve group 810 will automatically jump to relieve pressure to the flare system 820, preventing damage to the gas-liquid separation tank 300.

[0069] It should be noted that the gas-liquid separation tank 300 is designed to operate at a pressure of 0.1-0.2 MPa, with a design upper limit pressure of 0.4 MPa; the gas-liquid separation tank 300 top safety valve jump device: the design jump pressure is 0.4 MPa; the gas-liquid separation tank 300 first float liquid level meter 320 and second float liquid level meter 330: gas-liquid separation remote device with instrument control circuit; the gas-liquid separation tank 300 bottom cut-off valve connects the low liquid level remote interlocking system; the gas-liquid separation tank 300 bottom liquid level control valve 620 connects the second liquid level remote control system.

[0070] Referring to Figure 2 In a preferred technical solution, the first float liquid level meter 320 controls the pressure control valve 420 through the first liquid level remote meter 3111, the first liquid level indication adjustment meter 3121, and the pressure indication adjustment meter 430; the second float liquid level meter 330 controls the liquid level control valve through the second liquid level remote meter 3112 and the second liquid level indication adjustment meter 3122; the first float liquid level meter 320 controls the interlocking cut-off valve through the first liquid level remote meter 3111 and the liquid level indication interlocking meter 313; the first liquid level remote meter 3111 and the second liquid level remote meter 3112 are electrically connected.

[0071] The interlocking value of the first liquid level remote meter 3111 and the second liquid level remote meter 3112 is set to 10%, and when the two-out-of-two interlocking condition is met, the first liquid level remote meter 3111 and the second liquid level remote meter 3112 are triggered to interlock by the low-liquid-level interlocking control, so as to realize the interlocking cut-off of the valve, the pressure control valve 420 and the liquid level control valve; the first liquid level remote meter 3111 is set to 70%, the second liquid level remote meter 3112 is set to 70% flow rate 8-10 tons / hour (retreating oil flow rate designed in the process package), and the pressure indicating regulator 430 is set to 0.15 MPa-0.2 MPa.

[0072] When the liquid level in the gas-liquid separation tank 300 is 10%-70%, the interlocking cut-off valve is normally put into use; the first float liquid level gauge 320 is automatically adjusted by the electrically connected control of the first liquid level remote meter 3111, the first liquid level indicating regulator 3121 and the pressure indicating regulator 430 on the pressure control valve 420; and the second float liquid level gauge 330 is automatically adjusted by the electrically connected control of the second liquid level remote meter 3112 and the second liquid level indicating regulator 3122 on the liquid level control valve.

[0073] When the liquid level in the gas-liquid separation tank 300 is lower than 10%, the retreating oil of the material in the clay tower is completed, the first float liquid level gauge 320 is closed by the electrically connected control of the first liquid level remote meter 3111, the first liquid level indicating regulator 3121 and the pressure indicating regulator 430 on the pressure control valve 420; the second float liquid level gauge 330 is closed by the electrically connected control of the second liquid level remote meter 3112 and the second liquid level indicating regulator 3122 on the liquid level control valve; and the first float liquid level gauge 320 is closed by the electrically connected control of the first liquid level remote meter 3111 and the liquid level indicating interlocking meter 313 on the interlocking cut-off valve.

[0074] The safety valve group 810 system is put into use to ensure the safety and controllability of the gas-liquid separation tank 300; the interlocking cut-off interlocking system is put into use: the liquid level of the first liquid level remote meter 3111 and the second liquid level remote meter 3112 is lower than 10% (two-out-of-two)→liquid level indicating interlocking→interlocking cut-off valve 610 is closed; the pressure control system is put into use: the liquid level of the first liquid level remote meter 3111 is lower than 10%→first page liquid level indicating regulation control→pressure indicating regulation control→pressure control valve 420 is closed for cascade control; the liquid level of the first liquid level remote meter 3111 is 70%→first liquid level indicating regulation control→pressure indicating regulation control is automatically adjusted to 0.2 MPa→pressure control valve 420 controls the valve position (PID parameters need to be adjusted) for cascade control; the liquid level control valve 620 system is put into use: the second liquid level remote meter is set to 70%→the second liquid level indicating regulation control→the liquid level control valve controls the automatic flow rate 8-10 t / h (retreating oil flow rate designed in the process package)→the liquid level control valve controls the valve position (PID parameters need to be adjusted);

[0075] The oil removal process of the white clay tower is passed through, 0.2 MPa nitrogen pressure is set through the pressure indicating regulating table 430 to displace the material of the white clay tower; when the first liquid level remote table 3111 liquid level is lower than 70%, the first liquid level remote table 3111 liquid level lower than 70% is triggered, the first liquid level indicating regulating table 3121 control is triggered, the pressure indicating regulating table 430 control automatic 0.15 MPa is triggered, and the pressure control valve 420 control valve position is triggered.

[0076] The conventional process oil removal needs to arrange special personnel on site to observe the oil removal sight glass 520, and immediately closes the valve when bubbles appear, which needs two people to operate, and nitrogen gas is brought into the rectifying tower 200, which causes the risk of overpressure of the rectifying tower 200; during the process, the internal operator also needs to monitor the pressure change of the rectifying tower 200 at all times; through the oil removal of the present application, only the internal operator needs to monitor the DCS picture, and the gas-liquid separation tank 300 is monitored at all times, and when the material displacement is completed, the nitrogen gas and the valve are automatically triggered to be closed; through the transformation, the safety risk of overpressure caused by gas rushing into the rectifying tower 200 is avoided, and the safety valve jumping accident and product unqualified and the like are also avoided.

[0077] In the description of the present application, it should be understood that the orientations or positional relationships indicated by 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" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0078] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0079] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through intermediate media. Moreover, the first feature "above", "over" and "on" the second feature can be the first feature directly above or obliquely above the second feature, or just indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be the first feature directly below or obliquely below the second feature, or just indicate that the first feature is less than the second feature in horizontal height. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

Claims

1. A white clay tower oil stripping system, characterized in that: include The First White Earth Pagoda; Distillation column; A nitrogen main pipeline is connected to the inlet of the clay tower. A nitrogen main valve, a pressure control valve, and a pressure indicator gauge are sequentially installed on the nitrogen main pipeline. The gas-liquid separator is equipped with a float level gauge. The feed line is connected to the inlet of the distillation column; The oil return inlet line is connected at one end to the outlet of the clay tower and at the other end to the inlet of the gas-liquid separator. as well as The oil return outlet line is connected at one end to the bottom outlet of the gas-liquid separator and at the other end to the feed line. An interlock shut-off valve and a liquid level control valve are sequentially installed on the oil return outlet line.

2. The white clay tower oil removal system according to claim 1, characterized in that: The nitrogen main pipeline is equipped with a vent valve, which is located at the front end of the pressure control valve.

3. The white clay tower oil removal system according to claim 1, characterized in that: The pressure indicator and regulator are electrically connected to the nitrogen main pipeline; the float level gauge controls the pressure control valve in sequence via the level remote transmission meter, the level indicator and regulator, and the pressure indicator and regulator; the float level gauge controls the interlock shut-off valve in sequence via the level remote transmission meter, the level indicator and regulator, and the level indicator interlock meter; the float level gauge controls the level control valve in sequence via the level remote transmission meter and the level indicator and regulator.

4. The white clay tower oil removal system according to claim 1, characterized in that: It also includes a second bleaching 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 return inlet line through the second bleaching tower. The branch pipeline is connected in parallel with the first bleaching tower through the second bleaching tower.

5. The white clay tower oil removal system according to claim 1, characterized in that: The oil return inlet line is sequentially equipped with an oil return valve, a sight glass, and a one-way valve assembly.

6. The white clay tower oil removal system according to claim 1, characterized in that: It also includes a pressure relief pipeline, one end of which is connected to the top outlet of the gas-liquid separator and the other end of which is connected to the flare system. A safety valve assembly is installed on the pressure relief pipeline.

7. The white clay tower oil removal system according to claim 1, characterized in that: A local pressure gauge and a remote temperature gauge are sequentially installed on the feed line. The remote temperature gauge is electrically connected to the feed line. The joint between the oil return outlet line and the feed line is located downstream of the remote temperature gauge.

8. The white clay tower oil removal system according to claim 1, characterized in that: A pressure remote transmission instrument is electrically connected to the vapor phase outlet pipeline of the distillation column, and a temperature display and control instrument is electrically connected to the distillation column.

9. The white clay tower oil removal system according to claim 3, characterized in that: The float level gauge includes two float level gauges, with the first float level gauge and the second float level gauge placed inside the gas-liquid separator. The remote level transmitter includes two remote level transmitters, with the first remote level transmitter and the second remote level transmitter. The level indication and adjustment meter includes two level indication and adjustment meters, with the first level indication and adjustment meter and the second level indication and adjustment meter.

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