Online agent adding system for oil product blending

Abstract

The utility model discloses an online agent adding system for oil product blending, and belongs to the technical field of chemical additives. And the agent adding system comprises an agent adding pump, an inlet of the agent adding pump is connected with the agent adding tank through a first pipeline, an outlet of the agent adding pump is connected with the blending system through a second pipeline, the second pipeline is provided with a bag type energy accumulator, and the bag type energy accumulator is connected with the second pipeline through a third pipeline. The energy accumulator is arranged on the outlet pipeline of the agent adding pump, after agent adding is finished, when the volume of the chemical agent remaining in the pipeline is expanded, the energy accumulator air bag is compressed, the energy accumulator absorbs the continuously-rising pressure, and therefore the situation that the pressure in the pump outlet pipeline rises sharply is avoided, and the service life of the chemical agent is prolonged. And the problem of leakage of a static sealing point caused by volume expansion of liquid in a pipeline is fundamentally solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical additives, and particularly relates to an on-line additive adding system for oil blending. Background Art

[0002] In the process of blending oils such as gasoline, diesel, and aviation kerosene, various additives need to be added to the oil to ensure the quality of the refined oil, such as antistatic agents, antiwear agents, antioxidants, cetane improvers, etc. Because the dosage requirements of some additives are small, for example, for antistatic agents, according to calculations, only about 1 kg needs to be added per 10,000 m³ of oil. When the additive adding stops, in order to ensure that the chemical agent remaining in the additive pipeline does not cause the finished product quality to be unqualified due to the liquid expansion causing the chemical agent to flow into the oil, after the dosage reaches the requirement, the quantitative blending system will automatically cut off the additive adding. The volume expansion of the chemical agent remaining in the additive pipeline causes the pressure in the additive pipeline to rise sharply, reaching more than 4.0 MPa in a short time, resulting in leakage and pressure relief at some static seal points of the additive adding system. Summary of the Invention

[0003] To solve the above problems, the utility model provides an on-line additive adding system for oil blending.

[0004] The technical solution adopted by the utility model is as follows:

[0005] An on-line additive adding system for oil blending includes an additive pump. The inlet of the additive pump is connected to an additive tank through a first pipeline, and the outlet of the additive pump is connected to a blending system through a second pipeline. A bladder accumulator is provided on the second pipeline, and the bladder accumulator is connected to the second pipeline through a third pipeline.

[0006] By arranging an accumulator on the outlet pipeline of the additive pump, that is, the second pipeline, when the volume of the chemical agent remaining in the pipeline expands after the additive adding ends, the airbag of the accumulator is compressed to absorb the continuous increase in pressure caused by the expansion, fundamentally solving the problem of leakage at the static seal points caused by the expansion of the liquid volume in the pipeline.

[0007] Further, a first pressure gauge, a check valve, a first valve, a flow meter, and a second valve are sequentially arranged on the second pipeline along the material flow direction. The bladder accumulator is connected to the second pipeline between the first pressure gauge and the second valve through a third pipeline; the first valve is a manual valve, the second valve is an automatic valve, and the second valve is interlocked with the flow meter for control.

[0008] The flow meter is used to measure the additive dosage. When the additive dosage reaches the requirement, the second valve automatically closes, and the volume expansion of the chemical agent remaining in the pipeline compresses the airbag of the accumulator to avoid the continuous increase in pressure in the pipeline.

[0009] Further, the volume of the bladder accumulator is 2 to 4 liters. According to the second pipeline designed for the dosing amount, the pipeline volume capacity between the pump outlet and the second cut-off is about 2 liters. Therefore, a bladder accumulator with a volume of 2 to 4 liters is selected.

[0010] Further, the first valve is a manual ball valve, and the second valve is an automatic ball valve. The ball valve has good sealing performance and is suitable for small-diameter pipelines.

[0011] Further, a third valve, a filter, a fourth moving valve, and a second pressure gauge are sequentially arranged on the first pipeline along the material flow direction. The impurities in the chemical agent can be filtered out through the filter to prevent the pump from being blocked and ensure the quality of the oil product. The inlet pressure of the pump is monitored through the second pressure gauge to prevent the pump from being evacuated and causing fluctuations in the dosing amount.

[0012] Further, both the third valve and the fourth valve are manual ball valves. The valves in the pump inlet pipeline are generally open-type. The design of the valves is to cut off the pump inlet pipeline when overhauling the dosing pump to reduce the loss of chemical agent.

[0013] Further, a fourth pipeline is also provided between the second pipeline and the first pipeline. One end of the fourth pipeline is connected to the second pipeline between the first pressure gauge and the check valve, and the other end is connected to the first pipeline between the second pressure gauge and the dosing pump. A self-operated pressure regulating valve is provided on the fourth pipeline.

[0014] By setting the fourth pipeline and the self-operated pressure regulating valve, during dosing, when the pressure in the second pipeline exceeds the maximum working pressure at the dosing point, the self-operated pressure regulating valve automatically opens, and the liquid in the pump outlet pipeline flows back to the pump inlet pipeline through the fourth pipeline and then back to the dosing tank through the pump inlet pipeline, thereby releasing the pressure in the pump outlet pipeline and realizing the double insurance of pressure expansion and pressure stabilization in the dosing system.

[0015] Further, the self-operated pressure regulating valve is a spring-type valve with adjustable pressure value.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. By setting an accumulator on the outlet pipeline of the dosing pump, after dosing is completed, when the outlet pipeline of the pump expands due to temperature influence, the accumulator can have enough space to bear the expanded liquid in the pipeline, fundamentally solving the problem of liquid expansion in a small space.

[0018] 2. After being pressurized, the accumulator can be maintained at about 2.0 MPa, which can effectively absorb the pulse vibration of the pump outlet pipeline during dosing and protect the safety of the pipeline.

[0019] Through the above measures, the leakage problem of static sealing points in the on-line dosing system can be eliminated from the source. Description of the Drawings

[0020] Figure 1This is the structural diagram of the on-line additive system for oil blending in this application. Detailed implementation mode

[0021] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the drawings and a preferred implementation mode.

[0022] Refer to Figure 1 , this embodiment provides an on-line additive system for oil blending, including an additive pump 10 and a bladder accumulator 20. The inlet of the additive pump is connected to an additive tank through a first pipeline 1, and the outlet of the additive pump is connected to a blending system through a second pipeline 2. The additive tank is a raw material tank for storing chemical additives, and its volume is designed according to the daily dosage.

[0023] A third valve 11, a filter 12, a fourth valve 13 and a second pressure gauge 14 are successively arranged on the first pipeline 1 along the material flow direction. Preferably, both the third valve 11 and the fourth valve 13 are manual ball valves, which are flexible to open and close and easy to operate. In the use state, the third valve 11 and the fourth valve 13 are in the normally open state. The filter 12 is a general filter in the art, preferably a pipeline filter, which is convenient for installation and disassembly. The second pressure gauge 14 is a general pressure gauge in the art, and its rated pressure is 1.5 times the pump suction pressure.

[0024] A first pressure gauge 21, a check valve 22, a first valve 23, a flowmeter 24 and a second valve 25 are successively arranged on the second pipeline 2 along the material flow direction. The selection of valves and pressure gauges is the same as above. The check valve 22 is used to prevent the material in the second pipeline from flowing back to the additive pump. In the use state, the first valve 23 is a normally open manual valve, and the second valve 25 is an automatic valve. The second valve 25 is in interlock control with the flowmeter 24.

[0025] The chemical additives stored in the additive tank, under the action of the additive pump, successively pass through the third valve 11, the filter 12, the fourth valve 13, the second pressure gauge 14, the additive pump 10, the first pressure gauge 21, the check valve 22, the first valve 23, the flowmeter 24 and the second valve 25, and enter the blending system.

[0026] The bladder accumulator 20 is connected to the second pipeline 2 between the first pressure gauge 21 and the second valve 25 through a third pipeline 3; the bladder accumulator 20 is a prior art. Preferably, the volume of the bladder accumulator is 2-4 liters and it is connected to the third pipeline through a thread.

[0027] During use, first set the pressure of the airbag in the accumulator, that is, the airbag is pressurized to about 2.0 MPa;

[0028] During the additive injection process, when the amount of additive measured by the flowmeter reaches the process requirements, the second valve 25 automatically closes. When the pressure in the pipeline between the second valve and the pump outlet increases due to the volume expansion of the chemical agent, the expanded chemical agent compresses the accumulator airbag, and the accumulator absorbs the continuously increasing pressure caused by the expansion. When adding the additive again, the second valve automatically opens, and the airbag in the accumulator expands and returns to its initial state. After the second valve 25 closes, the third valve 11 and the fourth valve 13 also need to be closed to prevent the chemical agent in the pipeline from flowing back due to volume expansion or the materials in the tank from flowing back and mixing.

[0029] In another embodiment of the present application, a fourth pipeline 4 is further connected between the second pipeline 2 and the first pipeline 1. One end of the fourth pipeline 4 is connected to the second pipeline between the first pressure gauge 21 and the check valve 22, and the other end is connected to the first pipeline 1 between the second pressure gauge 14 and the additive pump 10. A self-operated pressure regulating valve 41 is provided on the fourth pipeline 4, and a pressure sensor (not shown in the figure) is provided on the second pipeline 2. The pressure sensor is in interlock control with the self-operated pressure regulating valve 41. Preferably, the self-operated pressure regulating valve 41 is a pneumatic or electric ball valve, which has flexible opening and closing and good sealing performance.

[0030] When the pressure in the second pipeline detected by the pressure sensor exceeds the maximum working pressure at the additive injection point, the self-operated pressure regulating valve automatically opens, and the liquid in the pump outlet pipeline flows back to the pump inlet pipeline through the fourth pipeline and then back to the additive tank through the pump inlet pipeline, thereby releasing the pressure in the pump outlet pipeline and realizing a double insurance for pressure expansion and pressure stabilization of the additive injection system.

[0031] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also within the protection scope of the present invention.

Claims

1. An oil blending online dosing system, characterized in that: The invention comprises a dosing pump (10), the inlet of the dosing pump is connected to the dosing tank through a first pipeline (1), the outlet of the dosing pump is connected to the blending system through a second pipeline (2), a bladder accumulator (20) is arranged on the second pipeline (2), and the bladder accumulator (20) is connected to the second pipeline (2) through a third pipeline (3).

2. The oil blending online dosing system according to claim 1, characterized in that: A first pressure gauge (21), a check valve (22), a first valve (23), a flow meter (24) and a second valve (25) are sequentially arranged on the second pipeline (2) along the material flow direction; the bladder accumulator (20) is connected to the second pipeline between the first pressure gauge (21) and the second valve (25) through a third pipeline; the first valve (23) is a manual valve, the second valve (25) is an automatic valve, and the second valve (25) is interlocked with the flow meter (24) for control.

3. An oil blending online dosing system according to claim 1 or 2, characterized in that: The volume of the bladder accumulator (20) is 2 to 4 liters.

4. The oil blending online dosing system according to claim 2, characterized in that: The first valve (23) is a manual ball valve, and the second valve (25) is an automatic ball valve.

5. An oil blending online dosing system according to claim 1 or 2, characterized in that: A third valve (11), a filter (12), a fourth valve (13) and a second pressure gauge (14) are sequentially arranged on the first pipeline (1) along the material flow direction.

6. The oil blending online dosing system according to claim 5, characterized in that: The third valve (11) and the fourth valve (13) are both manual ball valves.

7. An oil blending online dosing system according to claim 1 or 2, characterized in that: A fourth pipeline (4) is also provided between the second pipeline (2) and the first pipeline (1); one end of the fourth pipeline (4) is connected to the second pipeline between the first pressure gauge (21) and the check valve (22), and the other end is connected to the first pipeline (1) between the second pressure gauge (14) and the dosing pump (10); and a self-operated pressure regulating valve (41) is provided on the fourth pipeline (4).

8. The oil blending online dosing system according to claim 7, characterized in that: The self-operated pressure regulating valve (41) is a spring-type pressure-adjustable valve.

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