Drainage control system of oil storage tank

Abstract

The drainage control system comprises an oil storage tank body, the bottom of the oil storage tank body is communicated with an inlet of a drainage pipeline, an outlet of the drainage pipeline is communicated with an inlet of a sump, and an outlet of the sump is communicated with an inlet of a cold ring pool through the drainage pipeline. An outlet pipeline of the drainage pipeline is sequentially provided with an automatic oil interception drainage valve and an electromagnetic valve, a liquid level detector is arranged in the water collecting pit, and a sewage pump is arranged on the drainage pipeline, communicated with the cold ring pool, of the water collecting pit; the automatic oil intercepting and draining valve and the liquid level detector are respectively connected with the signal input end of the PLC programmable control system, and the signal output end of the PLC programmable control system is respectively connected with the electromagnetic valve and the sewage pump. The automatic oil intercepting and draining valve of the system performs oil-water separation of the oil storage tank according to the oil-water density difference and buoyancy principle, oil products can be prevented from overflowing under abnormal conditions, water draining of the oil tank is facilitated, meanwhile, the accident that ammonia water and shale oil overflow can be prevented, and the system is automatic in control, intelligent, efficient, green, environmentally friendly, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the field of oil storage equipment, in particular to an oil storage tank drainage control system. Background Art

[0002] Oil storage tanks are sealed steel containers used to store liquids or gases. They are crucial infrastructure for industries such as petroleum, chemicals, grain and oil, food, fire protection, transportation, metallurgy, and national defense. During operation, oil storage tanks leverage the principle of oil-water immiscibility and density differences to concentrate ammonia at the bottom of the tank. This facilitates drainage and prevents spills of ammonia and shale oil. However, existing oil storage tanks, due to concerns about rapid draining, can cause ammonia spills. Therefore, drainage pipes are installed beneath the tank outlet pipes, and workers perform on-site drainage. During drainage, operators must constantly monitor the tanks in the drainage area to prevent spills. In inclement weather such as rain or snow, operators must brave the rain and snow to drain the tanks to ensure smooth oil sales. This is a tedious, demanding, and inefficient task. Furthermore, oil storage tanks are located in hazardous materials areas, requiring operators to wear protective gear when draining them. Improper use of protective gear can pose significant safety risks. Utility Model Content

[0003] The utility model provides an oil storage tank drainage control system, which aims to solve the problems of high intensity and low efficiency of manual drainage of the oil storage tank and potential safety hazards in the drainage process.

[0004] To achieve its purpose, the utility model adopts the following technical solutions:

[0005] An oil storage tank drainage control system includes an oil storage tank body, the bottom of the oil storage tank body is connected to the inlet of the drainage pipe, the outlet of the drainage pipe is connected to the inlet of the sump, and the outlet of the sump is connected to the inlet of the cold ring pool through the drainage pipe; an automatic oil cut-off drainage valve and a solenoid valve are sequentially provided on the outlet pipe of the drainage pipe, a liquid level detector is provided in the sump, and a sewage pump is provided on the drainage pipe connecting the sump and the cold ring pool; the automatic oil cut-off drainage valve and the liquid level detector are respectively connected to the signal input end of the PLC programmable control system, and the signal output end of the PLC programmable control system is respectively connected to the solenoid valve and the sewage pump.

[0006] Furthermore, the drainage control system also includes an alarm, which is connected to the signal output end of the PLC programmable control system.

[0007] Furthermore, the difference between the highest liquid level and the lowest liquid level set by the liquid level detector is 0.6m.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] 1. The oil tank drainage control system provided by this utility model has an automatic oil shut-off valve installed on the outlet pipe of the oil tank body drainage pipe. It uses the difference in oil and water density and the principle of buoyancy to separate the oil and water in the oil tank, automatically preventing oil spills under abnormal conditions, facilitating tank drainage while ensuring safety. A liquid level detector is installed in the sump to monitor the liquid level in real time. If the liquid level in the sump is too high or too low, the PLC programmable control system can control the sewage pump to control the liquid level and prevent accidents such as ammonia and shale oil spills. The system is automated, intelligent, efficient, environmentally friendly, safe and reliable.

[0010] 2. The oil tank drainage control system provided by the utility model has an ingenious structural design and a strong logical control process. It replaces the traditional manual drainage method and can better drain the water in the oil tank in time, avoiding accidents such as water in the oil tank not being discharged in time or ammonia and shale oil overflowing due to weather or human factors, thereby improving the quality of oil products. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the oil tank drainage control system of the utility model;

[0012] Figure 2 This is the control principle diagram of the oil storage tank drainage control system of the utility model;

[0013] In the figure: 1- oil storage tank body; 2- PLC programmable control system; 3- drainage pipe; 4- sump; 5- cooling ring pool; 6- automatic oil shut-off and drainage valve; 7- solenoid valve; 8- liquid level detector; 9- sewage pump; 10- alarm. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] like Figure 1-2 As shown, the utility model is a drainage control system for an oil storage tank, comprising an oil storage tank body 1, the bottom of which is connected to the inlet of a drainage pipe 3, the outlet of which is connected to the inlet of a sump 4, and the outlet of which is connected to the inlet of a cooling ring tank 5 via the drainage pipe 3; an automatic oil shut-off drain valve 6 and a solenoid valve 7 are sequentially provided on the outlet pipe of the drainage pipe 3, a liquid level detector 8 is provided in the sump 4, and a sewage pump 9 is provided on the drainage pipe 3 connecting the sump 4 and the cooling ring tank 5; the drainage control system also includes an alarm 10; the automatic oil shut-off drain valve 6 and the liquid level detector 8 are respectively connected to the signal input terminal of a PLC programmable control system 2, and the signal output terminal of the PLC programmable control system 2 is respectively connected to the solenoid valve 7, the sewage pump 9, and the alarm 10. The maximum liquid level set by the liquid level detector 8 is 0.8m, and the minimum liquid level is 0.2m.

[0016] During operation, the automatic oil shut-off drain valve 6 on the outlet pipe of the drain pipe 3 monitors the water volume in the drain pipe 3 in real time based on the difference in oil and water densities. The float within the automatic oil shut-off drain valve 6 is raised and lowered to control the drain pipe 3 to drain the water. Specifically, when the drain pipe 3 is entirely filled with water or contains a small amount of floating oil, the float rises, the automatic oil shut-off drain valve 6 automatically opens, and a signal is fed back to the PLC programmable control system 2. The PLC programmable control system 2 receives the signal and controls the solenoid valve 7 to open. At this time, the water within the oil storage tank body 1 is discharged along the drain pipe 3 to the sump 4. When the drain pipe 3 is entirely filled with oil, the float of the automatic oil shut-off drain valve 6 sinks, closing the drain pipe 3 and preventing the oil from flowing out, thereby improving the quality of the oil. When the liquid level detector 8 in the sump 4 detects that the water level has risen to the maximum liquid level of 0.8m, the liquid level detector 8 will feed back the signal to the PLC programmable control system 2. The PLC programmable control system 2 receives the signal to control the sewage pump 9 to start, and pump the water in the sump 4 to the cold ring pool 5 to prevent overflow accidents caused by the high liquid level in the sump 4. While draining, the PLC programmable control system 2 will also control the alarm 10 to sound an alarm at a high liquid level, reminding the staff to pay attention to the drainage of the oil storage tank body 1, until the water level in the sump 4 drops to the lowest liquid level of 0.2m, the liquid level detector 8 will feed back the signal to the PLC programmable control system 2. The PLC programmable control system 2 receives the signal to control the sewage pump 9 and the alarm 10 to stop running to prevent the sewage pump 9 from burning out.

Claims

1. An oil tank drainage control system, comprising an oil tank body (1), wherein the bottom of the oil tank body (1) is connected to the inlet of a drainage pipe (3), and is characterized in that: The outlet of the drainage pipe (3) is connected to the inlet of the sump (4), and the outlet of the sump (4) is connected to the inlet of the cold ring pool (5) through the drainage pipe (3); an automatic oil cut-off drainage valve (6) and a solenoid valve (7) are sequentially provided on the outlet pipe of the drainage pipe (3), a liquid level detector (8) is provided in the sump (4), and a sewage pump (9) is provided on the drainage pipe (3) connecting the sump (4) and the cold ring pool (5); the automatic oil cut-off drainage valve (6) and the liquid level detector (8) are respectively connected to the signal input end of the PLC programmable control system (2), and the signal output end of the PLC programmable control system (2) is respectively connected to the solenoid valve (7) and the sewage pump (9).

2. The oil tank drainage control system according to claim 1, characterized in that: The drainage control system further comprises an alarm (10), which is connected to the signal output end of the PLC programmable control system (2).

3. The oil tank drainage control system according to claim 2, characterized in that: The difference between the highest liquid level and the lowest liquid level set by the liquid level detector (8) is 0.6m.

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