Crude oil storage tank water cutting system

Abstract

The utility model discloses a water cutting system of a crude oil storage tank. A water cutting device is arranged on the water cutting pipeline; the cofferdam is arranged around the crude oil storage tank; a greasy-dirt-containing water tank I; a valve I and a pump I are arranged on the oily sewage pipeline; the outlet end of the oily water tank II is provided with a valve II and is connected with an oily sewage pipeline; the cofferdam rainwater pool and the rainwater monitoring pool are arranged adjacently, and the rainwater monitoring pool and the cofferdam rainwater pool are connected through a pump II pipe; and the inlet end of the oily water tank III is connected with an oily sewage pipeline, and the outlet end is connected with a refining sewage plant. The oil-containing sewage is directly pumped to the oil-containing water tank III through the pump I instead of being adjacent to the cofferdam rainwater tank, so that leakage of the oil-containing water tank III and the cofferdam rainwater tank is avoided, pollution of oil and sewage to the environment is avoided, clean rainwater can be discharged in a qualified manner, and requirements of environmental protection regulations and standards are met.

Description

Technical Field

[0001] The utility model relates to the technical field of storage equipment, in particular to a water cutting system for a crude oil storage tank. Background Art

[0002] The crude oil in the external tank area of ​​the refinery mainly comes from purchased crude oil, which usually contains a small amount of water. This water will gather at the bottom of the storage tank to form water accumulation. In order to avoid the impact of water on the quality of oil products and storage safety, water cutting operations are required. The existing storage tanks in the external tank area of ​​the refinery have water cutting functions. At the same time, an oily wastewater collection pool is set up in the crude oil area for the collection and transfer of oily wastewater;

[0003] It was found through use that because the existing oily sewage pool and rainwater collection pool were of traditional design mode, the two were adjacent to each other and were reinforced concrete cast structures, and there was leakage. Therefore, the water cutting function of the crude oil area was transformed and optimized to ensure that the clean rainwater could be discharged in a qualified manner to avoid polluting the environment. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a crude oil storage tank water cutting system for the deficiencies of the prior art, which ensures that there is no leakage in the oily sewage pool and the rainwater collection pool, and avoids oil and sewage from polluting the environment.

[0005] The technical problem to be solved by the utility model is achieved through the following technical scheme: a water cutting system for a crude oil storage tank, the system comprising:

[0006] Crude oil storage tanks, in which crude oil is stored;

[0007] A water cut pipeline is arranged on the bottom of the crude oil storage tank, and a water cutter is arranged on the pipeline;

[0008] A cofferdam is arranged around the crude oil storage tank, wherein the crude oil storage tank and the water cutting pipeline are located inside the cofferdam;

[0009] Oily sewage pool I is set outside the cofferdam;

[0010] An oily sewage pipeline is arranged at the outlet end of the oily sewage pool I, and is provided with a valve I and a pump I;

[0011] The oily sewage pool II has a valve II at its outlet and is connected to the oily sewage pipeline;

[0012] A cofferdam rainwater pool and a rainwater monitoring pool, wherein the cofferdam rainwater pool is adjacent to the oily sewage pool II, and the rainwater monitoring pool is connected to the cofferdam rainwater pool via a pump II pipe;

[0013] The inlet of the oily wastewater pool III is connected to the oily wastewater pipeline, and the outlet is connected to the refinery wastewater plant.

[0014] The technical problem to be solved by the utility model can also be achieved through the following technical solutions. In the above-mentioned crude oil storage tank water cutting system, the water cutting pipeline is provided with the water cutter, sampling port, sight glass and reducer in sequence according to the fluid conveying direction.

[0015] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned crude oil storage tank water cutting system, two water cutting pipelines are provided. The two water cutting pipelines are located on both sides of the bottom of the crude oil storage tank, and the outlet ends of the two water cutting pipelines are connected in parallel to the oily sewage pool I.

[0016] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned crude oil storage tank water cutting system, both inlet and outlet ends of the oily sewage pool I are connected to the outlet end of the water cutting pipeline and the inlet end of the oily sewage pipeline through a hose.

[0017] The technical problem to be solved by the utility model can also be achieved through the following technical solutions: in the above-mentioned crude oil storage tank water cutting system, the top of the oily sewage pool I is provided with an oil and gas recovery pipe connected to the external oily sewage carbon tank.

[0018] The technical problem to be solved by the utility model can also be achieved through the following technical scheme. In the above-mentioned crude oil storage tank water cutting system, two oily sewage pipelines are arranged in parallel between the outlet end of the oily sewage pool I and the oily sewage pool III.

[0019] Compared with the prior art, the beneficial technical effects of the utility model are:

[0020] (1) By directly pumping the oily wastewater from Pump I to the oily wastewater pool III instead of setting it adjacent to the cofferdam rainwater pool, it is ensured that there is no leakage between the oily wastewater pool II and the cofferdam rainwater pool, thus avoiding oil and wastewater pollution to the environment. It can also ensure that the clean rainwater can be discharged in a qualified manner, meeting the requirements of environmental protection laws and regulations and standards;

[0021] (2) Two water cut-off pipes are set up to more efficiently drain the accumulated water at the bottom of the crude oil storage tank, reduce the retention time of the accumulated water and the risk of erosion on the crude oil storage tank structure, thereby ensuring the safe operation of the storage tank and extending its service life. In addition, sight glasses are added to the water cut-off pipes to facilitate observation by personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] In the figure, 1. crude oil storage tank; 2. water cut-off pipeline; 3. water cutter; 4. sampling port; 5. sight glass; 6. reducer; 7. cofferdam; 8. oily sewage pool I; 9. hose; 10. oily sewage pipeline; 11. pump II; 12. oily sewage pool III; 13. oil and gas recovery pipe; 14. valve I; 15. pump I; 16. oily sewage pool II; 17. cofferdam rainwater pool; 18. rainwater monitoring pool; 19. valve II. DETAILED DESCRIPTION

[0024] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0025] Example 1, reference Figure 1 , a crude oil storage tank water cutting system, the system comprising;

[0026] A crude oil storage tank 1, in which crude oil is stored;

[0027] A water cut pipeline 2 is arranged at the bottom of the crude oil storage tank 1. The water cut pipeline 2 is provided with a water cutter 3, a sampling port 4, a sight glass 5 and a reducer 6 in sequence according to the fluid conveying direction. The model and specification of the water cutter 3 can be selected according to the use requirements. By adding the sight glass 5, the staff can observe the internal situation of the water cut pipeline 2 conveniently;

[0028] In order to more efficiently discharge the accumulated water at the bottom of the crude oil storage tank 1, reduce the retention time of the accumulated water and the risk of erosion on the structure of the crude oil storage tank 1, thereby ensuring the safe operation of the storage tank and extending its service life, we set two water cut-off pipes 2, which are located on both sides of the bottom of the crude oil storage tank 1, and the outlet ends of the two water cut-off pipes 2 are connected in parallel to the oily sewage pool I;

[0029] A cofferdam 7 is arranged around the crude oil storage tank 1, and the crude oil storage tank 1 and the water cutting pipeline 2 are located inside the cofferdam 7;

[0030] An oily sewage pool Ⅰ8 is arranged outside the cofferdam 7, and both inlet and outlet ends of the oily sewage pool Ⅰ8 are connected to the outlet end of the water cut-off pipeline 2 and the inlet end of the oily sewage pipeline 10 through a hose 9;

[0031] The oily sewage pipeline 10 is provided with two, one of which is for standby and the other is for common use. The two oily sewage pipelines 10 are arranged in parallel between the outlet end of the oily sewage pool I8 and the oily sewage pool III12;

[0032] Since the oily sewage pool Ⅰ8 needs to be vented when fluid enters, and a small amount of oil and gas will be mixed in the gas, in order to prevent this part of oil and gas from affecting the external air, we set an oil and gas recovery pipe 13 connected to the external oily sewage carbon tank at the top of the oily sewage pool Ⅰ8;

[0033] An oily wastewater pipeline 10 is provided at the outlet end of the oily wastewater pool Ⅰ8, and is provided with a valve Ⅰ14 and a pump Ⅰ15;

[0034] It should be noted that by pumping the oily sewage directly from pump Ⅰ15 to the oily sewage pool Ⅲ12 instead of setting it adjacent to the cofferdam rainwater pool, it is ensured that there is no leakage between the oily sewage pool Ⅲ12 and the cofferdam rainwater pool, thus avoiding oil and sewage from polluting the environment, and ensuring that the clean rainwater can be discharged in a qualified manner, meeting the requirements of environmental protection laws and regulations and standards;

[0035] The oily sewage pool II 16 has a valve II 19 at its outlet and is connected to the oily sewage pipeline 10;

[0036] The cofferdam rainwater pool 17 and the rainwater monitoring pool 18 are arranged adjacent to the oily sewage pool II 16. The rainwater monitoring pool 18 is connected to the cofferdam rainwater pool 17 through a pump II 11 pipe, and the cofferdam rainwater pool 17 is also connected to the oily sewage pool II 16 pipe. When the rainwater monitoring pool detects that the oil index in the cofferdam rainwater pool 17 exceeds the standard, the cofferdam rainwater pool 17 will transport the fluid to the oily sewage pool II 16, and the oily sewage pool II 16 will pump the fluid to the oily sewage pipeline 10, thereby ensuring that the clean rainwater can be discharged in a qualified manner;

[0037] The inlet end of the oily wastewater pool III 12 is connected to the oily wastewater pipeline 10, and the outlet end is connected to the refinery wastewater plant.

[0038] The optimized crude oil tank water cutting system separates the cofferdam rainwater pool 17 from the outlet end of the oily sewage pool Ⅰ8. The oily sewage at the outlet end of the oily sewage pool Ⅰ8 is directly pumped into the oily sewage pool Ⅲ12 through pump Ⅰ15 without polluting the cofferdam rainwater pool 17, thereby ensuring that the clean rainwater can be discharged in a qualified manner. When the rainwater monitoring pool 18 detects that the rainwater contains oil and does not meet the discharge standard, the fluid in the cofferdam rainwater pool 17 enters the oily sewage pool Ⅱ16, and enters the oily sewage pool Ⅲ12 through the oily sewage pipeline 10, and is finally sent to the refinery sewage plant for centralized treatment, thereby ensuring that the clean rainwater can be discharged in a qualified manner to the greatest extent.

Claims

1. A crude oil storage tank water cut-off system, characterized in that: The system includes; Crude oil storage tanks, in which crude oil is stored; A water cut pipeline is arranged on the bottom of the crude oil storage tank, and a water cutter is arranged on the pipeline; A cofferdam is arranged around the crude oil storage tank, wherein the crude oil storage tank and the water cutting pipeline are located inside the cofferdam; Oily sewage pool I is set outside the cofferdam; An oily sewage pipeline is arranged at the outlet end of the oily sewage pool I, and is provided with a valve I and a pump I; The oily sewage pool II has a valve II at its outlet and is connected to the oily sewage pipeline; A cofferdam rainwater pool and a rainwater monitoring pool, wherein the cofferdam rainwater pool is adjacent to the oily sewage pool II, and the rainwater monitoring pool is connected to the cofferdam rainwater pool via a pump II pipe; The inlet of the oily wastewater pool III is connected to the oily wastewater pipeline, and the outlet is connected to the refinery wastewater plant.

2. A crude oil storage tank water cut-off system according to claim 1, characterized in that: The water cutter, sampling port, sight glass and reducer are arranged on the water cut pipeline in sequence according to the fluid conveying direction.

3. A crude oil storage tank water cutting system according to claim 1, characterized in that: There are two water cut-off pipelines, which are located at both sides of the bottom of the crude oil storage tank, and the outlet ends of the two water cut-off pipelines are connected in parallel to the oily sewage pool I.

4. A crude oil storage tank water cut-off system according to claim 1, characterized in that: Both inlet and outlet ends of the oily sewage pool I are connected to the outlet end of the water cutting pipeline and the inlet end of the oily sewage pipeline through a hose.

5. A crude oil storage tank water cut-off system according to claim 1, characterized in that: The top of the oily sewage pool I is provided with an oil and gas recovery pipe connected to an external oily sewage carbon tank.

6. A crude oil storage tank water cut-off system according to claim 1, characterized in that: There are two oily sewage pipelines, which are arranged in parallel between the outlet end of the oily sewage pool I and the oily sewage pool III.

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