Sealing oil dehydration system of fractionation device

Abstract

The utility model discloses an oil sealing and dewatering system of a fractionating device. The oil sealing and dewatering system comprises an oil sealing tank, an oil sealing and dewatering pump, a DCS dewatering flowmeter and a fractionating tower, the bottom of the oil sealing tank is filled with water-containing sealing oil; the output end of the oil sealing tank is connected with the input end of the sealing oil dewatering pump; the output end of the seal oil dehydration pump is connected with one end of the DCS dehydration flowmeter, the other end of the DCS dehydration flowmeter is connected with the fractionating tower, and the DCS dehydration flowmeter is configured to monitor flow in real time; the fractionating column is configured to fractionate the recovered seal oil. The problems that in the prior art, sealing oil dehydration is not thorough, and the oil slurry pump of a fractionating tower shakes, device operation fluctuates and sealing oil is wasted are easily caused are solved, and the technical effects that sealing oil dehydration is thorough, so that operation fluctuates and even shutdown caused by the oil slurry pump shake with water in sealing oil can be avoided, and the sealing oil can be recycled are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of oil sealing and dehydration, and in particular to an oil sealing and dehydration system for a fractionation device. Background Art

[0002] In the field of refining, seal oil is an important auxiliary medium and is widely used in heat exchangers, pumps and other equipment to play the role of sealing, lubrication and cooling. Since the seal oil carries water during use, an oil-water mixture is formed. The water in the oil-water mixture is injected into the oil slurry pump seal and then vaporized, which can easily cause the oil slurry pump to sway, thereby causing operational fluctuations and even causing the production system to stop, causing significant economic losses to the company.

[0003] Traditional seal oil dehydration adopts intermittent dehydration to the collection barrel and then pouring it into the dirty oil pool. This method cannot ensure that the seal oil is completely dehydrated, which will cause the oil slurry pump of the distillation tower to shake, the operation fluctuation of the device and even the cutting of the material. In addition, the seal oil carried by dehydration to the dirty oil pool cannot be recovered, resulting in waste of seal oil and increasing the cost of dirty oil treatment. Utility Model Content

[0004] The embodiment of the present application provides a sealing oil dehydration system for a distillation device, thereby solving the problem in the prior art that the sealing oil is not cleanly dehydrated, which easily causes the oil slurry pump of the distillation tower to sway, the operation fluctuation of the device and the waste of sealing oil. The sealing oil is cleanly dehydrated, thereby avoiding the operation fluctuation or even shutdown caused by the sway of the oil slurry pump with water in the sealing oil, and the technical effect of recovering the sealing oil can be achieved.

[0005] The embodiment of the utility model provides a sealing oil dehydration system for a fractionation device, comprising a sealing oil tank, a sealing oil dehydration pump, a DCS dehydration flowmeter and a fractionation tower; the bottom of the sealing oil tank is filled with water-containing sealing oil, the output end of the sealing oil tank is connected to the input end of the sealing oil dehydration pump; the output end of the sealing oil dehydration pump is connected to one end of the DCS dehydration flowmeter, the other end of the DCS dehydration flowmeter is connected to the fractionation tower, the DCS dehydration flowmeter is configured to monitor the flow in real time; the fractionation tower is configured to fractionate and recover the sealing oil.

[0006] In a possible implementation, an oil sealing dehydration pump inlet filter is further included; an oil sealing dehydration pump inlet filter is also connected between the oil sealing tank and the oil sealing dehydration pump, and the oil sealing dehydration pump inlet filter is configured to protect the oil sealing dehydration pump.

[0007] In a possible implementation, it also includes a sealing oil dehydration flowmeter side line gate valve; one end of the sealing oil dehydration flowmeter side line gate valve is connected between the sealing oil dehydration pump and the DCS dehydration flowmeter, and the other end of the sealing oil dehydration flowmeter side line gate valve is connected between the DCS dehydration flowmeter and the distillation tower.

[0008] In a possible implementation, it further includes a check valve at the outlet of the sealing oil dewatering pump; a check valve at the outlet of the sealing oil dewatering pump is also connected between the sealing oil dewatering pump and the DCS dewatering flowmeter.

[0009] In a possible implementation, it further includes a front gate valve of the sealing oil dewatering flowmeter and a rear gate valve of the sealing oil dewatering flowmeter; the front gate valve of the sealing oil dewatering flowmeter and the rear gate valve of the sealing oil dewatering flowmeter are respectively connected to both ends of the DCS dewatering flowmeter; one end of the bypass gate valve of the sealing oil dewatering flowmeter is connected between the check valve at the outlet of the sealing oil dewatering pump and the front gate valve of the sealing oil dewatering flowmeter, and the other end of the bypass gate valve of the sealing oil dewatering flowmeter is connected between the rear gate valve of the sealing oil dewatering flowmeter and the fractionating tower.

[0010] In a possible implementation, it further includes an inlet valve of the sealing oil dewatering pump and an outlet valve of the sealing oil dewatering pump; the inlet valve of the sealing oil dewatering pump is arranged between the sealing oil tank and the inlet filter of the sealing oil dewatering pump; the outlet valve of the sealing oil dewatering pump is arranged between the check valve at the outlet of the sealing oil dewatering pump and the front gate valve of the sealing oil dewatering flowmeter.

[0011] In a possible implementation, it further includes a root valve at the bottom of the sealing oil tank; the root valve at the bottom of the sealing oil tank is arranged between the sealing oil tank and the inlet valve of the sealing oil dewatering pump.

[0012] One or more technical solutions provided by this application have at least the following technical effects:

[0013] In an embodiment of the present utility model, a fractionation unit seal oil dehydration system is adopted, which includes a seal oil tank, a seal oil dehydration pump, a DCS dehydration flowmeter, and a fractionation tower. The bottom of the seal oil tank is filled with water-containing seal oil. The seal oil tank, as a storage container, can safely contain the water-containing seal oil, preventing the mixture from leaking out and causing environmental pollution or safety hazards. The output end of the seal oil tank is connected to the input end of the seal oil dehydration pump, enabling the water-containing seal oil to smoothly transfer from the seal oil tank to the seal oil dehydration pump, providing a necessary material flow path for the subsequent dehydration process. The output end of the seal oil dehydration pump is connected to one end of the DCS dehydration flowmeter. The seal oil dehydration pump transports the preliminarily dehydrated water-containing seal oil to the DCS dehydration flowmeter through its output end. The DCS dehydration flowmeter can accurately measure the flow rate and, through real-time monitoring, provide key operation data for operators to ensure the dehydration effect and processing efficiency. The other end of the DCS dehydration flowmeter is connected to the fractionation tower. The DCS dehydration flowmeter is configured to monitor the flow rate in real time. The fractionation tower is configured to fractionally recover the seal oil. The mixture after flow measurement is further transported to the fractionation tower. As the core processing unit of the system, the fractionation tower effectively separates the seal oil and water in the mixture through fractionation, achieving efficient recovery of the seal oil. This application solves the problems in the prior art, such as incomplete dehydration of the seal oil, which easily causes fluctuations in the oil slurry pump of the fractionation tower, fluctuations in device operation, and waste of seal oil. It realizes clean dehydration of the seal oil, thereby avoiding fluctuations in operation or even shutdown caused by the seal oil with water in the oil slurry pump, and also achieving the technical effect of recovering the seal oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for description in the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic diagram of a fractionation unit seal oil dehydration system provided by an embodiment of the present application.

[0016] Reference numerals: 1 - seal oil tank; 2 - seal oil dehydration pump; 3 - DCS dehydration flowmeter; 4 - fractionation tower; 5 - inlet filter of the seal oil dehydration pump; 6 - bypass gate valve of the seal oil dehydration flowmeter; 7 - check valve at the outlet of the seal oil dehydration pump; 8 - gate valve before the seal oil dehydration flowmeter; 9 - gate valve after the seal oil dehydration flowmeter; 10 - inlet valve of the seal oil dehydration pump; 11 - outlet valve of the seal oil dehydration pump; 12 - root valve at the bottom of the seal oil tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of 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 should not be construed as a limitation of the present invention. The terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0019] The embodiment of the present invention provides a sealing oil dehydration system for a fractionation device, which includes a sealing oil tank 1, a sealing oil dehydration pump 2, a DCS dehydration flowmeter 3, and a fractionation tower 4; the bottom of the sealing oil tank 1 is filled with water-containing sealing oil, and the output end of the sealing oil tank 1 is connected to the input end of the sealing oil dehydration pump 2; the output end of the sealing oil dehydration pump 2 is connected to one end of the DCS dehydration flowmeter 3, and the other end of the DCS dehydration flowmeter 3 is connected to the fractionation tower 4. The DCS dehydration flowmeter 3 is configured to monitor the flow rate in real time; the fractionation tower 4 is configured to fractionate and recover the sealing oil.

[0020] Exemplarily, the sealing oil tank 1 can store water-containing sealing oil. A pressure sensor is provided in the sealing oil tank 1 to monitor the pressure inside the sealing oil tank 1. When the pressure inside the sealing oil tank 1 exceeds the normal range, the system can send out an alarm signal. Exemplarily, the sealing oil dehydration pump 2 can pump the water-containing sealing oil out of the sealing oil tank 1 and transport it to the subsequent treatment unit, providing a necessary material flow path for the subsequent dehydration treatment process. The DCS dehydration flowmeter 3 is not only used to monitor the flow rate data passing through the pipeline in real time, but also can exchange data with the DCS (distributed control system) to realize remote monitoring and automatic adjustment. The flowmeter adopts a high-precision sensor to ensure the accuracy and reliability of the measurement data. At the same time, the flowmeter also has a flow alarm function. When the flow rate exceeds the set range, it can issue an alarm in time.

[0021] Exemplarily, the fractionating tower 4 is the core processing unit of the system. Through physical processes such as heating and condensation, the sealing oil and moisture in the mixture are effectively separated.

[0022] Exemplarily, the water-containing sealing oil in the sealing oil tank 1 is continuously transported to the fractionating tower 4 by the sealing oil dewatering pump 2. Among them, the DCS dewatering flowmeter 3 can monitor the flow rate in real time, so as to ensure that the sealing oil is dehydrated cleanly. The sealing oil and moisture mixture entering the fractionating tower 4 can recover the sealing oil after fractionation in the fractionating tower 4, and the moisture therein is transported to the sewage stripping treatment together with the sulfur-containing ammonia sewage.

[0023] In the embodiment of the present application, a sealing oil dewatering pump inlet filter 5 is further included; a sealing oil dewatering pump inlet filter 5 is also connected between the sealing oil tank 1 and the sealing oil dewatering pump 2, and the sealing oil dewatering pump inlet filter 5 is configured to protect the sealing oil dewatering pump 2.

[0024] Exemplarily, the sealing oil dewatering pump inlet filter 5 is used to filter impurities and particulate matters in the water-containing sealing oil to prevent these impurities from damaging the dewatering pump. In order to maintain the filtering effect, an automatic or manual cleaning system can be equipped to clean the filter regularly or replace the filter element regularly.

[0025] In the embodiment of the present application, a sealing oil dewatering flowmeter bypass valve 6 is further included; one end of the sealing oil dewatering flowmeter bypass valve 6 is connected between the sealing oil dewatering pump 2 and the DCS dewatering flowmeter 3, and the other end of the sealing oil dewatering flowmeter bypass valve 6 is connected between the DCS dewatering flowmeter 3 and the fractionating tower 4.

[0026] Exemplarily, a bypass system is set at the DCS dewatering flowmeter 3, and a sealing oil dewatering flowmeter bypass valve 6 is set on the bypass system, which can continue to transport the mixture through the bypass system when the DCS dewatering flowmeter 3 needs to be maintained or cleaned, so as to ensure the continuous operation of the system.

[0027] In the embodiment of the present application, a sealing oil dewatering pump outlet check valve 7 is further included; a sealing oil dewatering pump outlet check valve 7 is also connected between the sealing oil dewatering pump 2 and the DCS dewatering flowmeter 3.

[0028] Exemplarily, installing a sealing oil dewatering pump outlet check valve 7 at the outlet of the sealing oil dewatering pump 2 can prevent the medium from flowing back, thereby protecting the sealing oil dewatering pump 2 from damage.

[0029] In the embodiment of the present application, it further includes a front gate valve 8 of the seal oil dehydration flowmeter and a rear gate valve 9 of the seal oil dehydration flowmeter; both ends of the DCS dehydration flowmeter 3 are respectively connected to the front gate valve 8 of the seal oil dehydration flowmeter and the rear gate valve 9 of the seal oil dehydration flowmeter; one end of the bypass gate valve 6 of the seal oil dehydration flowmeter is connected between the check valve 7 at the outlet of the seal oil dewatering pump and the front gate valve 8 of the seal oil dehydration flowmeter, and the other end of the bypass gate valve 6 of the seal oil dehydration flowmeter is connected between the rear gate valve 9 of the seal oil dehydration flowmeter and the fractionating tower 4.

[0030] Exemplarily, when the DCS dehydration flowmeter 3 is working, the front gate valve 8 of the seal oil dehydration flowmeter and the rear gate valve 9 of the seal oil dehydration flowmeter are opened. When the DCS dehydration flowmeter 3 needs to be maintained or cleaned, the front gate valve 8 of the seal oil dehydration flowmeter and the rear gate valve 9 of the seal oil dehydration flowmeter are closed.

[0031] In the embodiment of the present application, it further includes an inlet valve 10 of the seal oil dewatering pump and an outlet valve 11 of the seal oil dewatering pump; the inlet valve 10 of the seal oil dewatering pump is arranged between the seal oil tank 1 and the inlet filter 5 of the seal oil dewatering pump; the outlet valve 11 of the seal oil dewatering pump is arranged between the check valve 7 at the outlet of the seal oil dewatering pump and the front gate valve 8 of the seal oil dehydration flowmeter.

[0032] Exemplarily, when maintaining, overhauling or replacing the inlet filter 5 of the seal oil dewatering pump, by closing the inlet valve 10 of the seal oil dewatering pump, accidental leakage of the medium can be prevented, protecting the safety of operators and equipment. Moreover, the inlet valve 10 of the seal oil dewatering pump also has the functions of regulating flow rate and preventing backflow.

[0033] Exemplarily, during the operation of the seal oil dewatering pump 2, the outlet valve 11 of the seal oil dewatering pump can assist in regulating the pressure and flow rate in the pipeline, ensuring that the medium enters the subsequent processing unit in a proper state. By finely adjusting the opening degree of the valve, precise control of the flow rate and pressure can be achieved. When maintenance, overhaul or transformation work needs to be carried out on the seal oil dewatering pump 2, closing the outlet valve 11 of the seal oil dewatering pump can isolate the seal oil dewatering pump 2, protecting the safety of operators and equipment.

[0034] In the embodiment of the present application, it further includes a root valve 12 at the bottom of the seal oil tank; the root valve 12 at the bottom of the seal oil tank is arranged between the seal oil tank 1 and the inlet valve 10 of the seal oil dewatering pump.

[0035] Exemplarily, during the maintenance, overhaul or transformation of the seal oil tank 1, closing the root valve 12 at the bottom of the seal oil tank can effectively isolate the connection between the seal oil tank 1 and the subsequent processing unit. This not only protects the safety of operators, but also prevents accidental leakage of the medium during maintenance, reducing the risk of environmental pollution.

[0036] The embodiment of the present utility model provides a seal oil dehydration system for a fractionating device, and its technological process is as follows:

[0037] The normal operating device is transported to each user through the seal oil tank 1 at a rate of about 20 T / H for calculation. 20×0.003 (the water content index of cracked light oil is not more than 0.3%) = 0.06 T / H = 60 L / H, that is, 60 liters of water need to be dehydrated per hour. The seal oil dehydration pump 2 (designed rated flow 1m 3 / h) is used to transport it to the alkaline waste oil recycling port of the fractionating tower 4. The seal oil is separated and recovered through the fractionating tower 4, and the water is separated and sent to the sewage stripping treatment. Among them, the DCS dehydration flowmeter 3 monitors the flow rate in real time, which can ensure that the seal oil is dehydrated cleanly, thus avoiding the situation of operation fluctuations or even shutdown caused by the sloshing of the oil slurry pump with water-carrying seal oil.

[0038] In this application, the water-containing seal oil in the seal oil tank 1 is continuously transported to the fractionating tower 4 through the seal oil dehydration pump 2 for separation. Among them, the DCS dehydration flowmeter 3 monitors the flow rate in real time, which can not only ensure that the seal oil is dehydrated cleanly, but also avoid operation fluctuations or even shutdown caused by the sloshing of the oil slurry pump with water-carrying seal oil, and can also recover the seal oil, thus avoiding the waste of the seal oil. Further, by continuously dehydrating to the fractionating tower 4 through the seal oil dehydration pump 2, the labor intensity of personnel operation is reduced.

[0039] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. The key points of each embodiment are the differences from other embodiments.

[0040] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit this application; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of this application.

Claims

1. A sealing oil dehydration system for a fractionation unit, characterized in that, It includes a seal oil tank (1), a seal oil dehydration pump (2), a DCS dehydration flowmeter (3), and a fractionating tower (4); The bottom of the seal oil tank (1) is filled with water-containing seal oil, and the output end of the seal oil tank (1) is connected to the input end of the seal oil dehydration pump (2); The output end of the seal oil dehydration pump (2) is connected to one end of the DCS dehydration flowmeter (3), the other end of the DCS dehydration flowmeter (3) is connected to the fractionating tower (4), and the DCS dehydration flowmeter (3) is configured to monitor the flow rate in real time; The fractionating tower (4) is configured to fractionally recover the seal oil.

2. The seal oil dehydration system of the fractionation device according to claim 1, characterized in that, It further includes a seal oil dehydration pump inlet filter (5); A seal oil dehydration pump inlet filter (5) is also connected between the seal oil tank (1) and the seal oil dehydration pump (2), and the seal oil dehydration pump inlet filter (5) is configured to protect the seal oil dehydration pump (2).

3. The fractionation unit seal oil dehydration system according to claim 2, wherein It further includes a seal oil dehydration flowmeter bypass valve (6); One end of the seal oil dehydration flowmeter bypass valve (6) is connected between the seal oil dehydration pump (2) and the DCS dehydration flowmeter (3), and the other end of the seal oil dehydration flowmeter bypass valve (6) is connected between the DCS dehydration flowmeter (3) and the fractionating tower (4).

4. The oil sealing and dehydration system of the fractionation unit according to claim 3, characterized in that, It further includes a seal oil dehydration pump outlet check valve (7); A seal oil dehydration pump outlet check valve (7) is also connected between the seal oil dehydration pump (2) and the DCS dehydration flowmeter (3).

5. The oil sealing and dehydration system of the fractionating device according to claim 4, characterized in that, It further includes a valve (8) in front of the seal oil dehydration flowmeter and a valve (9) behind the seal oil dehydration flowmeter; Valve (8) in front of the seal oil dehydration flowmeter and valve (9) behind the seal oil dehydration flowmeter are respectively connected to both ends of the DCS dehydration flowmeter (3); One end of the seal oil dehydration flowmeter bypass valve (6) is connected between the seal oil dehydration pump outlet check valve (7) and the valve (8) in front of the seal oil dehydration flowmeter, and the other end of the seal oil dehydration flowmeter bypass valve (6) is connected between the valve (9) behind the seal oil dehydration flowmeter and the fractionating tower (4).

6. The oil seal dehydration system of the fractionation device according to claim 5, characterized in that, It further includes a seal oil dehydration pump inlet valve (10) and a seal oil dehydration pump outlet valve (11); The seal oil dehydration pump inlet valve (10) is arranged between the seal oil tank (1) and the seal oil dehydration pump inlet filter (5); The seal oil dehydration pump outlet valve (11) is arranged between the seal oil dehydration pump outlet check valve (7) and the valve (8) in front of the seal oil dehydration flowmeter.

7. The oil sealing and dehydration system of the fractionation unit according to claim 6, characterized in that, It further includes a valve (12) at the bottom root of the seal oil tank; The valve (12) at the bottom root of the seal oil tank is arranged between the seal oil tank (1) and the seal oil dehydration pump inlet valve (10).

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