Nitrogen supplementing and balancing device for unloading of tank truck

Abstract

The utility model relates to a tank car unloading nitrogen supplementing and balancing device which comprises a nitrogen inlet pipe connected to a tank of a tank car and a tail gas exhaust pipe connected to the tank, and a pressure reducing valve, a first pressure sensor and a first adjusting valve are arranged on the nitrogen inlet pipe. And a second pressure sensor and a second regulating valve are respectively arranged on the tail gas discharge pipe. According to the nitrogen supplementing and balancing device for unloading of the tank truck, in the unloading process of the tank, the nitrogen supplementing amount is controllable, the risks that the pressure is too high and the tank is not resistant to pressure are avoided, the problems that the pressure is too low and negative pressure is formed are also avoided, the nitrogen supplementing and balancing device is particularly suitable for unloading of class A low-flash-point products, and unloading is safer.

Description

Technical Field

[0001] The utility model specifically relates to a nitrogen supplement balance device for unloading a tank truck. Background Art

[0002] During the unloading process of the tank truck, the material is transferred from the tank truck to the packaging barrel using a pump group. During the unloading process, as the liquid level decreases, air will enter the tank. However, it is relatively dangerous for Class A low flash point materials. The traditional method is to introduce nitrogen into the tank, but at the same time, nitrogen is discharged at the same time for nitrogen sealing. Although it can reduce the danger to a certain extent, the following problems still exist: 1) The amount of nitrogen introduced during the unloading process cannot be accurately calculated. The amount of nitrogen entering is achieved by controlling the opening size of the manual valve. Excessive introduction will cause nitrogen waste. If the breathing valve fails, there will be a risk of overpressure leakage; 2) If the amount of nitrogen introduced is too small, negative pressure will be generated in the tank during the unloading process. The breathing valve of the tank truck will operate to inhale air. The air enters the tank truck and mixes with the fuel vapor in the car to form explosive gas, which poses an explosion risk; 3) The control of nitrogen entering and exiting the tank requires manual operation by the operator. It is difficult to find a balance between the flow rate and nitrogen replenishment during the unloading process. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a nitrogen supplement balance device for unloading a tank truck with safer unloading in view of the deficiencies in the prior art.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A nitrogen supplement and balance device for unloading a tank truck comprises a nitrogen intake pipe connected to a tank of the tank truck, the nitrogen supplement and balance device for unloading a tank truck also comprises an exhaust gas discharge pipe connected to the tank, a pressure reducing valve, a first pressure sensor and a first regulating valve are respectively arranged on the nitrogen intake pipe, and a second pressure sensor and a second regulating valve are respectively arranged on the exhaust gas discharge pipe.

[0006] In some embodiments, a limiting flow plate is further provided on the nitrogen inlet pipe.

[0007] In some specific implementations, the pressure reducing valve, the first pressure sensor, the first regulating valve, and the flow limiting plate are sequentially arranged on the nitrogen inlet pipe.

[0008] In some specific embodiments, a ball valve is further provided on the nitrogen inlet pipe, and the pressure reducing valve is located between the ball valve and the first pressure sensor.

[0009] In some embodiments, the tank truck unloading nitrogen supplement balance device also includes a bypass pipe connected to the exhaust gas emission pipe, the two ends of the bypass pipe are respectively connected to the two sides of the second regulating valve, and the bypass pipe is provided with a drain valve.

[0010] In some specific embodiments, a check valve is further provided on the exhaust gas discharge pipe.

[0011] In some specific implementations, the second pressure sensor, the second regulating valve, and the check valve are sequentially arranged on the exhaust pipe.

[0012] In some specific embodiments, one end of the bypass pipe is connected between the second pressure sensor and the second regulating valve, and the other end of the bypass pipe is connected between the second regulating valve and the check valve.

[0013] In some specific embodiments, the drain valve is a solenoid valve.

[0014] In some specific implementations, the first regulating valve and the second regulating valve are electric regulating valves respectively.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] The utility model discloses a nitrogen supplementation balancing device for unloading a tank truck. During the unloading process of the tank, the nitrogen supplementation amount can be controlled, thereby avoiding the risk of excessive pressure and the tank being pressure-intolerant, and also avoiding the problem of excessive pressure and the formation of negative pressure. The utility model is particularly suitable for the unloading of Class A low-flash point products, and the unloading is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a nitrogen supplement balance device for unloading a tank truck according to a representative embodiment of the utility model;

[0018] In the figure: 1. nitrogen inlet pipe; 2. exhaust gas discharge pipe; 3. tank; 4. pressure reducing valve; 5. flow limiting plate; 6. first pressure sensor; 7. second pressure sensor; 8. first regulating valve; 9. second regulating valve; 10. drain valve; 11. check valve; 12. bypass pipe; 13. ball valve. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0020] like Figure 1The tank truck unloading nitrogen supplement balance device shown comprises a nitrogen intake pipe 1 connected to the tank 3 of the tank truck and an exhaust gas discharge pipe 2 connected to the tank 3. The nitrogen intake pipe 1 is respectively provided with a pressure reducing valve 4, a first pressure sensor 6 and a first regulating valve 8, and the exhaust gas discharge pipe 2 is respectively provided with a second pressure sensor 7 and a second regulating valve 9. The first regulating valve 8 and the second regulating valve 9 are respectively electric regulating valves.

[0021] Nitrogen enters tank 3 through nitrogen inlet pipe 1, and before entering tank 3, nitrogen is decompressed by pressure reducing valve 4 to reduce the risk of overpressure caused by nitrogen compensation process. The first regulating valve 8 controls the intake amount of nitrogen according to the pressure of the exhaust outlet in tank 3 detected by the second pressure sensor 7. After the nitrogen supplement exceeds a certain set pressure (that is, the detection value on the second pressure sensor 7 exceeds a certain pressure (such as 1000-2000Pa)), the first regulating valve 8 adjusts the intake amount or closes, and the second regulating valve 9 is opened in a regulated manner according to the data value detected by the first pressure sensor 6 to discharge excess nitrogen from the exhaust pipe 2.

[0022] The nitrogen inlet pipe 1 is also provided with a ball valve 13 and a flow limiting plate 5. The ball valve 13, the pressure reducing valve 4, the first pressure sensor 6, the first regulating valve 8 and the flow limiting plate 5 are sequentially arranged on the nitrogen inlet pipe 1. The nitrogen after decompression is controlled by the flow limiting plate 5 to flow into the tank 3. The nitrogen replenishment volume per second is slightly higher than the maximum volume used per second during the unloading process according to the actual filling speed, so as to prevent the tank 3 from forming high pressure in a short time.

[0023] A check valve 11 is also arranged on the exhaust pipe 2 . The second pressure sensor 7 , the second regulating valve 9 , and the check valve 11 are arranged in sequence on the exhaust pipe 2 .

[0024] The tank truck unloading nitrogen supplement balance device also includes a bypass pipe 12 connected to the tail gas discharge pipe 2, one end of the bypass pipe 12 is connected between the second pressure sensor 7 and the second regulating valve 9, the other end of the bypass pipe 12 is connected between the second regulating valve 9 and the check valve 11, and an emptying valve 10 is arranged on the bypass pipe 12. When the nitrogen supplement amount generated during the unloading process of the tank 3 exceeds the maximum allowable protection value (such as 5000Pa) (that is, the detection value of the second pressure sensor 7 exceeds the protection value), the emptying valve 10 is opened to quickly discharge the pressure in the tank 3, so as to ensure that the pressure in the tank 3 is within the safety value and avoid the occurrence of danger.

[0025] During specific use, nitrogen is controlled to open by the ball valve 13 in the nitrogen inlet pipe 1 and then passes through the pressure reducing valve 4 to enter the nitrogen dosage adjustment control link. The decompressed nitrogen passes through the first electric valve 8 and the second pressure sensor 7 to detect the pressure of the tail gas outlet in the tank 3 to control the nitrogen replenishment amount. The flow limiting plate 5 effectively controls the instantaneous maximum amount of nitrogen entering the tank 3. During the unloading process, as the liquid level drops, the nitrogen replenishment amount is continuously replenished, and the pressure in the tank will change. After exceeding the set pressure, the first regulating valve 8 adjusts the intake amount or closes, and the second regulating valve 9 is opened in an adjustable manner according to the data value detected by the first pressure sensor 6, and the excess nitrogen is discharged from the tail gas discharge pipe 2. When the nitrogen replenishment amount generated during the unloading process of the tank 3 exceeds the maximum allowable protection value, the drain valve 10 is opened to quickly discharge the pressure in the tank 3 to ensure that the pressure in the tank 3 is within a safe value. During the unloading process of tank 3, the nitrogen replenishment volume can be controlled to avoid the risk of excessive pressure and tank 3 not being able to withstand pressure, and also to avoid the problem of too low pressure and the formation of negative pressure. It is especially suitable for the unloading of Class A low flash point products.

[0026] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A nitrogen supplement balance device for unloading a tank truck, comprising a nitrogen inlet pipe connected to the tank of the tank truck, characterized in that: The tank truck unloading nitrogen supplement balance device also includes an exhaust gas discharge pipe connected to the tank, the nitrogen intake pipe is respectively provided with a pressure reducing valve, a first pressure sensor and a first regulating valve, and the exhaust gas discharge pipe is respectively provided with a second pressure sensor and a second regulating valve.

2. The nitrogen supplement balance device for tank truck unloading according to claim 1 is characterized in that: A flow limiting plate is also arranged on the nitrogen inlet pipe.

3. The nitrogen supplement balance device for tank truck unloading according to claim 2 is characterized in that: The pressure reducing valve, the first pressure sensor, the first regulating valve and the flow limiting plate are arranged in sequence on the nitrogen inlet pipe.

4. The nitrogen supplement balance device for tank truck unloading according to claim 3 is characterized in that: A ball valve is also provided on the nitrogen inlet pipe, and the pressure reducing valve is located between the ball valve and the first pressure sensor.

5. The nitrogen supplement balance device for tank truck unloading according to claim 1 is characterized in that: The tank truck unloading nitrogen supplement balance device also includes a bypass pipe connected to the tail gas emission pipe, the two ends of the bypass pipe are respectively connected to the two sides of the second regulating valve, and the bypass pipe is provided with a drain valve.

6. The nitrogen supplement balance device for tank truck unloading according to claim 5 is characterized in that: The tail gas discharge pipe is also provided with a check valve.

7. The nitrogen supplement balance device for tank truck unloading according to claim 6 is characterized in that: The second pressure sensor, the second regulating valve and the check valve are arranged in sequence on the tail gas exhaust pipe.

8. The nitrogen supplement balance device for tank truck unloading according to claim 7 is characterized in that: One end of the bypass pipe is connected between the second pressure sensor and the second regulating valve, and the other end of the bypass pipe is connected between the second regulating valve and the check valve.

9. The nitrogen supplement balance device for tank truck unloading according to claim 5 is characterized in that: The drain valve is a solenoid valve.

10. The nitrogen supplement balance device for tank truck unloading according to claim 1, characterized in that: The first regulating valve and the second regulating valve are electric regulating valves respectively.

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