Low-energy-consumption automatic loading system for low-temperature liquid

Abstract

The utility model relates to the field of low-temperature liquid loading, in particular to a low-energy-consumption automatic low-temperature liquid loading system which comprises a low-temperature liquid storage tank, a delivery pump, a hose assembly and a subcooler, the subcooler is provided with a shell and an inner container, the top of the inner container is provided with a cut-off hole, and the lower portion of the low-temperature liquid storage tank is provided with a first delivery pipe. The first conveying pipe is connected with the conveying pump in series and connected to an inner container of the subcooler, the top of a shell of the subcooler is connected with a second conveying pipe, the second conveying pipe is connected back to the low-temperature liquid storage tank, a discharging port of the inner container of the subcooler is connected with a third conveying pipe, the third conveying pipe is connected to the hose assembly, and a fourth conveying pipe is arranged on the low-temperature liquid storage tank and connected to the third conveying pipe. The utility model has the following beneficial effects: the running energy consumption of the pump is reduced, and the loss of products and the consumption of electricity are reduced; the transportation loss is reduced, and the metering accuracy of the mass flow meter is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low temperature liquid loading, especially low temperature liquid low energy consumption automatic loading system. BACKGROUND

[0002] At present, low temperature liquid loading is divided into automatic loading system and manual loading system, with the continuous improvement of automation degree, the application of low temperature liquid automatic loading system is more and more widely.

[0003] The existing low temperature liquid automatic loading system includes low temperature liquid storage tank, delivery pump and circulating pipeline, and the low temperature liquid is continuously circulated in the circulating pipeline through the delivery pump.In loading the low temperature liquid tank car, the low temperature liquid tank car is connected to the circulating pipeline to load.

[0004] The problem is that the delivery pump needs to be continuously operated, causing a large amount of self-circulation of low temperature liquid.The low temperature liquid circulating in the circulating pipeline exchanges heat with the heat in the external environment, causing a large amount of vaporization.The low temperature liquid after vaporization is discharged to the atmosphere through the low temperature liquid storage tank, causing a large loss of liquid.Meanwhile, the low temperature liquid after being pressurized by the delivery pump also causes vaporization, and the low temperature liquid after vaporization and liquid phase are delivered to the low temperature liquid storage tank, which easily causes two-phase flow in the pipeline during the delivery process, causing inaccurate measurement of the mass flow meter. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of low temperature liquid low energy consumption automatic loading system, with the characteristics of reducing energy consumption, accurate measurement.

[0006] The above technical purpose of the utility model is realized by the following technical scheme: low temperature liquid low energy consumption automatic loading system, including low temperature liquid storage tank, delivery pump, hose assembly, further including subcooler, the subcooler has shell and inner container, the top of inner container is provided with intercepting hole, the lower part of low temperature liquid storage tank is provided with delivery pipe one, delivery pipe one is connected to the inner container of subcooler in series with delivery pump, the top of shell of subcooler is connected with delivery pipe two, delivery pipe two is connected to low temperature liquid storage tank, the discharge port of inner container of subcooler is connected with delivery pipe three, delivery pipe three is connected to hose assembly, delivery pipe four is set on low temperature liquid storage tank, and delivery pipe four is connected to delivery pipe three.

[0007] Preferably, valve one is arranged on delivery pipe one.

[0008] Preferably, valve four is arranged on delivery pipe two.

[0009] Preferably, pressure detector is arranged on delivery pipe three close to the outlet of inner container.

[0010] Preferably, mass flow meter and valve three are arranged on delivery pipe three close to hose assembly.

[0011] Preferably, valve two is connected in series in the delivery pipe four and is connected to delivery pipe three between the pressure detector and the mass flow meter.

[0012] Preferably, valve 1, valve 2, valve 3, valve 4, the delivery pump, the temperature detector, and the pressure detector are all connected to the PLC controller.

[0013] In summary, this utility model has the following beneficial effects:

[0014] 1. By eliminating the drawbacks of continuous long-term operation of the pump in conventional automatic loading systems, the pump's operating energy consumption is reduced, thus reducing product loss and electricity consumption;

[0015] 2. The addition of a subcooler keeps the transported low-temperature and low-pressure materials in a subcooled state, reducing transportation losses and ensuring the accuracy of the mass flow meter measurement. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an embodiment;

[0017] Figure 2 This is a schematic diagram of the subcooler.

[0018] In the diagram, 1. Cryogenic liquid storage tank; 2. Transfer pump; 3. Hose assembly; 4. Subcooler; 41. Outer shell; 42. Inner liner; 43. Cut-off orifice; 51. Transfer pipe one; 52. Transfer pipe two; 53. Transfer pipe three; 54. Transfer pipe four; 61. Valve one; 62. Valve two; 63. Valve three; 64. Valve four; 7. Pressure detector; 8. Mass flow meter; 9. PLC controller; 10. Temperature detector. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0021] Example: Figure 1 and Figure 2 As shown, it includes a cryogenic liquid storage tank 1, a transfer pump 2, a subcooler 4, and a PLC controller 9.

[0022] The bottom of the low-temperature liquid storage tank 1 is connected with a delivery pipe 51, and the delivery pipe 51 is connected with the supercooler 4. The delivery pipe 51 is provided with a valve 61 and a delivery pump 2. The supercooler 4 comprises an outer shell 41 and an inner container 42, and the two are provided with a sandwich layer. The top of the inner container 42 is provided with a flow blocking hole 43. The delivery pipe 51 is connected with the upper part of the inner container 42. The top of the outer shell 41 is connected with a delivery pipe 52, and the other end of the delivery pipe 52 is connected with the upper part of the low-temperature liquid storage tank 1, and the delivery pipe 52 is provided with a valve 64. The lower part of the inner container 42 is connected with a delivery pipe 53, and the delivery pipe 53 is connected with the hose assembly 3. The delivery pipe 53 is provided with a pressure detector 7, a mass flow meter 8 and a valve 63, and the pressure detector 7 is arranged close to the discharge port of the supercooler 4. The upper part of the low-temperature liquid storage tank 1 is connected with a delivery pipe 54, and the other end of the delivery pipe 54 is connected with the delivery pipe 53 between the pressure detector 7 and the mass flow meter 8. The delivery pipe 54 is provided with a valve 62 and a temperature detector 10.

[0023] The valve 61, the valve 62, the valve 63, the valve 64, the delivery pump 2, the temperature detector 10 and the pressure detector 7 are connected with the PLC controller 9 and controlled by the PLC controller 9.

[0024] Working steps:

[0025] Step 1: After the low-temperature liquid tank truck arrives at the loading area, the hose assembly 3 is connected with the automatic loading system.

[0026] Step 2: The operator confirms that the low-temperature liquid tank truck has been connected and is ready for loading, and the valve 64 is fully opened.

[0027] Step 3: The automatic loading system enters the cold delivery pump 2 program, confirms that the valve 62 is fully opened, the valve 61 is slightly opened, the temperature decreasing rate displayed by the temperature detector 10 is not greater than 10℃ / min, and the low-temperature liquid is delivered from the bottom of the low-temperature liquid storage tank 1 to the supercooler 4 through the delivery pump 2, and then flows back to the low-temperature liquid storage tank 1 through the valve 62.

[0028] Step 4: When the temperature detected by the temperature detector 10 is lower than -185℃ and the cooling time of the loading system is greater than 10 minutes, the valve 61 is fully opened, and the cold pump process of the delivery pump 2 is completed.

[0029] Step 5: The delivery pump 2 is automatically started, and the pressure detector 7 detects that the outlet pressure of the delivery pump 2 is greater than or equal to 0.6MPa within 30 seconds, the delivery pump 2 is successfully started, if the outlet pressure is less than 0.6MPa, the pump fails to start, and the cold delivery pump 2 program is re-entered.

[0030] Step 6, the low-temperature liquid is pressurized by the delivery pump 2 and sent to the supercooler 4. In the supercooler 4, a part of the low-temperature liquid entering the inner container 42 is vaporized due to the pressure drop and is discharged from the orifice 43 to return to the low-temperature liquid storage tank 1 through the valve four 64. The vaporization process generates cold energy, so that the low-temperature liquid is in a supercooled state;

[0031] Step 7, after the delivery pump 2 normally operates for 1 min, the valve three 63 is first opened by 50%, the valve two 62 is closed by 50%, then the valve three 63 is fully opened, the valve two 62 is fully opened, and the mass flow meter 8 starts to measure, and the loading process is started;

[0032] Step 8, after the mass flow meter 8 reaches the set loading amount, the valve two 62 is opened by 50%, the valve three 63 is closed by 50%, then the valve two 62 is opened by 100%, and the valve three 63 is fully closed, and the filling is completed;

[0033] Step 9, after the filling is completed, the delivery pump 2 stops operating, the valve one 61 is closed, and the loading system enters the standby mode.

Claims

1. A low-energy-consumption automatic loading system for cryogenic liquids, comprising a cryogenic liquid storage tank (1), a transfer pump (2), and a hose assembly (3), characterized in that, It also includes a subcooler (4), which has an outer shell (41) and an inner liner (42). A flow-stopping hole (43) is opened on the top of the inner liner (42). A first conveying pipe (51) is provided at the bottom of the cryogenic liquid storage tank (1). The first conveying pipe (51) is connected in series with the conveying pump (2) and connected to the inner liner (42) of the subcooler (4). A second conveying pipe (52) is connected to the top of the outer shell (41) of the subcooler (4). The second conveying pipe (52) is connected back to the cryogenic liquid storage tank (1). The outlet of the inner liner (42) of the subcooler (4) is connected to a third conveying pipe (53). The third conveying pipe (53) is connected to the hose assembly (3). A fourth conveying pipe (54) is provided on the cryogenic liquid storage tank (1). The fourth conveying pipe (54) is connected to the third conveying pipe (53).

2. The low-energy automatic loading system for cryogenic liquids according to claim 1, characterized in that, A valve (61) is installed on the conveying pipe (51).

3. The low-energy automatic loading system for cryogenic liquids according to claim 2, characterized in that, Valve 4 (64) is installed on the second (52) conveying pipe.

4. The low-energy automatic loading system for cryogenic liquids according to claim 3, characterized in that, A pressure detector (7) is installed at the outlet of the delivery pipe (53) near the inner liner (42).

5. The low-energy automatic loading system for cryogenic liquids according to claim 4, characterized in that, A mass flow meter (8) and a valve (63) are installed near the hose assembly (3) on the delivery pipe (53).

6. The low-energy automatic loading system for cryogenic liquids according to claim 5, characterized in that, The fourth delivery pipe (54) is connected in series with the second valve (62) and is connected to the third delivery pipe (53) between the pressure detector (7) and the mass flow meter (8).

7. The low-energy automatic loading system for cryogenic liquids according to claim 6, characterized in that, Valve 1 (61), Valve 2 (62), Valve 3 (63), Valve 4 (64), Pump 2, Temperature Detector (10), and Pressure Detector (7) are all connected to PLC controller (9).

Images