Ethylene cracking device with waste oil drainage tank

Abstract

The utility model provides an ethylene cracking device with a waste oil drainage tank, and relates to the technical field of chemical production. The ethylene cracking device comprises a recovery tank, and the upper end of the recovery tank is connected with a funnel through a pipeline; the upper end of the recovery tank is also communicated with air through a first pipeline; the first pipeline is communicated with a second pipeline, and the second pipeline is communicated with a nitrogen tank; and the recovery tank is also respectively connected with a third pipeline and a fourth pipeline and is connected with an underground storage tank. Pollutant emission is reduced through technical improvement, waste oil discharged by sampling replacement and instruments is recycled, environment-friendly quality is improved, the waste oil is recycled after being poured into the recycling tank, energy is saved, meanwhile, it is avoided that when the waste oil is poured into the recycling tank, air is possibly brought into the recycling tank to generate explosive gas, and the environment-friendly effect is achieved. Meanwhile, downstream system fluctuation caused by air is also avoided, and the operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to an ethylene cracking device with a waste oil drainage tank. Background Art

[0002] During the normal operation of the quenching area of ​​the ethylene cracking unit of Hengli Petrochemical (Dalian) Chemical Co., Ltd., some waste oil is generated when sampling and emptying the filter. There is no place to treat this waste oil. A waste oil drain tank is added to the waste oil tank D-1201 of the ethylene cracking unit to collect the waste oil generated at ordinary times. It is pumped into the C-1210 tower through the P-1201 pump for recycling, lowering emission standards, reducing emissions, and recovering energy. When pouring into the D-1201 tank, air may be brought into the D-1201. When the air is brought into the ground tank, it is easy to form explosive gas with the oil and gas in the ground tank. At the same time, the air is easy to enter the back system through the ground tank, causing fluctuations in the back system.

[0003] Therefore, the present invention makes technical improvements to the D-1201 oil pouring tank to improve operational safety. Utility Model Content

[0004] The utility model provides an ethylene cracking device with a waste oil drainage tank, which solves the problem that the existing ethylene cracking device cannot recover waste oil.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An ethylene cracking device with a waste oil drainage tank comprises a recovery tank, wherein the upper end of the recovery tank is connected to a funnel through a pipeline; the upper end of the recovery tank is also connected to the air through a first pipeline; the first pipeline is connected to a second pipeline, and the second pipeline is connected to a nitrogen tank; the recovery tank is also connected to a third pipeline and a fourth pipeline respectively and connected to an underground storage tank.

[0007] Furthermore, a funnel cover is provided on the funnel.

[0008] Furthermore, a flow limiting orifice is provided on the second pipeline, a fourth valve is provided on the second pipeline close to one side of the flow limiting orifice, and a fifth valve is provided on the second pipeline close to one end of the nitrogen tank.

[0009] Furthermore, a first valve is provided on the pipeline connecting the recovery tank and the funnel.

[0010] Furthermore, a second valve and a third valve are also provided on the first pipeline, and the second pipeline is communicated with the first pipeline between the second valve and the third valve.

[0011] Furthermore, a liquid level gauge is provided on the recovery tank.

[0012] Furthermore, the top center of the recovery tank is connected to a safety valve group, and the tripping pressure of the safety valve group is 0.70 MPa.

[0013] Furthermore, the third pipeline is provided with a sixth valve and a seventh valve; the fourth pipeline is provided with an eighth valve and a ninth valve.

[0014] The beneficial effects of the utility model are:

[0015] The utility model reduces pollution emissions through technical improvements, recycles waste oil discharged from sampling, replacement and instruments, and improves environmental protection quality. The waste oil is recycled when poured into a recovery tank, and is pumped into the C-1210 tower for recycling through the P-1201 pump, saving energy. At the same time, it avoids the possibility of air being brought into the recovery tank to produce explosive gas when the waste oil is poured into the recovery tank, and also avoids the system fluctuation caused by air on the downstream, thereby improving operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is an overall schematic diagram of the utility model.

[0018] Description of Figure Numbers:

[0019] 1. Recovery tank; 2. Funnel; 3. First pipeline; 4. Second pipeline; 5. Nitrogen tank; 6. Underground storage tank; 7. First valve; 8. Second valve; 9. Third valve; 10. Fourth valve 15; 11. Fifth valve 16; 12. Flow limiting orifice; 13. Safety valve group; 14. Third pipeline; 15. Fourth pipeline; 16. Liquid level meter. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0027] The utility model provides a technical solution: an ethylene cracking device with a waste oil drainage tank, such as Figure 1 As shown, it includes a recovery tank 1 to collect waste oil generated at ordinary times. The upper end of the recovery tank 1 is connected to the funnel 2 through a pipeline, and the funnel 2 is provided with a funnel cover; the pipeline connecting the recovery tank 1 and the funnel 2 is provided with a first valve 7. The upper end of the recovery tank 1 is also connected to the air through a first pipeline 3, and the first pipeline 3 is also provided with a second valve 8 and a third valve 9; the second pipeline 4 is connected to the first pipeline 3 between the second valve 8 and the third valve 9; the second pipeline 4 is connected to a nitrogen tank 5; the recovery tank 1 is also connected to an underground storage tank 6 through two pipelines respectively.

[0028] The recovery tank 1 is provided with a liquid level meter 16. When the liquid level meter 16 detects that the waste oil level in the recovery barrel 1 is high, the waste oil is poured into the underground storage tank 6 through the recovery tank 1. The pump (P-1201) is connected to the recovery tank 1 and pumped into the C-1210 tower for recycling.

[0029] The top center of the recovery tank 1 is connected to the safety valve group 13, and the tripping pressure of the safety valve group 13 is 0.70 MPa.

[0030] The safety valve group 13, the liquid level gauge 16, the pressure gauge, the temperature gauge, etc. will make the device more perfect, eliminate potential risks, and also make it more convenient for operators to operate.

[0031] The steps for recycling waste oil in a recovery tank include the following:

[0032] 1. Before the waste oil enters the recovery tank 1, use the static electricity release ball to eliminate the static electricity on the human body.

[0033] 2. After confirming that the first valve 7 is closed, pour the waste oil into the funnel and then cover the funnel cover;

[0034] 3. Open the second valve 8 and the third valve 9 to connect the recovery tank 1 to the atmosphere so that the oil and gas can be discharged, and release the pressure in the recovery tank 1 to normal pressure to prevent the oil and gas from spraying out from the funnel 2;

[0035] 4. Open the first valve 7 to discharge the waste oil into the recovery tank 1;

[0036] 5. Close the first valve 7 and the third valve 9, open the fourth valve 10 and the fifth valve 11 to add ammonia through the flow limiting orifice 12, wait until the pressure gauge above the liquid level gauge rises to 0.2-0.3Mpa, close the valve, open the third valve 9 to replace the recovery tank, and repeat this step 3 times.

[0037] 6. After the replacement is completed, close the second valve 8, the third valve 9, the fourth valve 10 and the fifth valve 11 to maintain a slightly positive pressure state in the recovery tank 1.

[0038] 7. Then open the sixth valve and the seventh valve to discharge to the D-1201 valve, open the eighth valve and the ninth valve and the valve balanced with D-1201 (not shown in the figure), and the waste oil in the recovery tank falls into the underground storage tank by gravity.

[0039] 8. After completion, close the sixth valve, the seventh valve, the eighth valve and the ninth valve.

[0040] 9. If the pressure in the recovery tank 1 is insufficient when discharging oil into the underground storage tank 6, the fourth valve 10 and the fifth valve 11 can be slightly opened to charge nitrogen into the recovery tank 1 to pressurize the oil. After the oil is pressed, the fourth valve 10 and the fifth valve 11 can be closed.

[0041] Note: The tripping pressure of the safety valve group 13 at the top of the recovery tank 1 is 0.70Mpa. Pay attention to the pressure inside the recovery tank 1 when filling with nitrogen.

[0042] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An ethylene cracking unit with a waste oil drain tank, characterized in that: The invention comprises a recovery tank (1), wherein the upper end of the recovery tank (1) is connected to a funnel (2) through a pipeline; the upper end of the recovery tank (1) is also connected to the air through a first pipeline (3); the first pipeline (3) is connected to a second pipeline (4), and the second pipeline (4) is connected to a nitrogen tank (5); the recovery tank (1) is also connected to a third pipeline (14) and a fourth pipeline (15) respectively, and is connected to an underground storage tank (6).

2. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: The funnel (2) is provided with a funnel cover.

3. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: A flow limiting orifice (12) is provided on the second pipeline (4), a fourth valve (10) is provided on the second pipeline (4) near the side of the flow limiting orifice (12), and a fifth valve (11) is provided on the second pipeline (4) near one end of the nitrogen tank (5).

4. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: A first valve (7) is provided on the pipeline connecting the recovery tank (1) and the funnel (2).

5. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: A second valve (8) and a third valve (9) are also provided on the first pipeline (3), and the second pipeline (4) is connected to the first pipeline (3) between the second valve (8) and the third valve (9).

6. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: The recovery tank (1) is provided with a liquid level meter (16).

7. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: The top center of the recovery tank (1) is connected to a safety valve group (13), and the tripping pressure of the safety valve group (13) is 0.70 MPa.

8. The ethylene cracking device with a waste oil drain tank according to claim 1, characterized in that: The third pipeline (14) is provided with a sixth valve and a seventh valve; the fourth pipeline (15) is provided with an eighth valve and a ninth valve.

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