A valve control system for a cryogenic liquid transport vehicle with an external pump

Abstract

The present invention discloses a valve control system for a cryogenic liquid transport vehicle with an external pump, comprising a tank and a cryogenic pump. The tank is provided with a top liquid inlet pipe and a bottom liquid inlet pipe, the liquid inlet end of the top liquid inlet pipe is connected to a top liquid inlet external valve, the liquid inlet end of the bottom liquid inlet pipe is connected to a bottom liquid inlet external valve, the liquid inlet ends of the top liquid inlet external valve and the liquid inlet ends of the bottom liquid inlet external valve are connected to a liquid inlet interface via a liquid inlet main pipe; an emergency shut-off valve and a third pipeline safety valve are sequentially installed in the pipeline of the bottom liquid inlet pipe; the liquid inlet end of the cryogenic pump is connected to the bottom liquid inlet pipe via a liquid inlet pump valve, the liquid outlet end of the cryogenic pump is connected to a liquid discharge pipe, the liquid discharge end of the liquid discharge pipe is equipped with a pump outlet interface, and the liquid discharge valve and a check valve are sequentially installed in the pipeline of the liquid discharge pipe. The valve arrangement of the present invention is reasonable, the operation is easy, and the safety is high.

Description

Technical Field

[0001] The present invention relates to the technical field of valve control, in particular to a valve control system of a cryogenic liquid transport vehicle equipped with an external pump, specifically a valve control system of a cryogenic liquid transport vehicle equipped with an external pump. Background Art

[0002] A tank container is installed on a cryogenic liquid transport vehicle equipped with an external pump. The tank container consists of an outer container and an inner container located within the outer container. A vacuum insulation layer is formed between the outer and inner containers. The inner container of the tank container is used to store cryogenic liquid. The filling and unloading of cryogenic liquids are carried out using pipelines connected to the tank container. Due to the special characteristics of cryogenic liquids and the complexity of the pipelines, the setting of valve control is very critical. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a valve control system for a cryogenic liquid transport vehicle with an external pump, which has a reasonable arrangement, is easy to operate and has high safety, in view of the current status of the above-mentioned prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A valve control system for a cryogenic liquid transport vehicle with an external pump comprises a tank box and a cryogenic pump for pumping out the cryogenic liquid in the tank box, wherein a top liquid inlet pipe is provided on the top of the tank box, and a bottom liquid inlet pipe is provided on the bottom of the tank box, the liquid inlet end of the top liquid inlet pipe is connected to the top liquid inlet external valve, the liquid inlet end of the bottom liquid inlet pipe is connected to the bottom liquid inlet external valve, the liquid inlet end of the top liquid inlet external valve and the liquid inlet end of the bottom liquid inlet external valve are connected to a liquid inlet interface via a liquid inlet main pipe; an emergency shut-off valve and a third pipeline safety valve are sequentially installed in the pipeline of the bottom liquid inlet pipe; the liquid inlet end of the cryogenic pump is connected to the bottom liquid inlet pipe via a liquid inlet pump valve, the liquid outlet end of the cryogenic pump is connected to a liquid unloading pipe, the liquid discharge end of the liquid unloading pipe is equipped with a pump liquid outlet interface, and the liquid unloading pipe pipeline is sequentially installed with a pump liquid outlet valve and a check valve.

[0006] To optimize the above technical solutions, specific measures taken also include:

[0007] The liquid inlet main pipe is connected to a fifth pipeline safety valve and a first residual liquid discharge valve; the bottom liquid inlet pipe is bypass-connected to a liquid phase analysis valve, and the liquid outlet of the liquid phase analysis valve is connected to a liquid phase analysis interface.

[0008] The sixth pipeline safety valve is connected to the front bypass of the pump outlet valve on the above-mentioned liquid unloading pipe. The fourth pipeline safety valve and the second residual liquid discharge valve are connected to the pipeline between the check valve and the pump outlet interface on the liquid unloading pipe through a four-way joint.

[0009] The liquid outlet of the cryogenic pump is provided with a reflux pipe connected to the top liquid inlet pipe. A reflux valve is installed in the reflux pipe. The liquid inlet end of the reflux valve is connected to the pump rear pressure gauge valve through a tee. The pump rear pressure gauge valve is connected to the pump outlet pressure gauge.

[0010] An air pressure monitoring tube is led out from the upper front end of the above-mentioned tank container, and a front pressure gauge valve is installed on the air pressure monitoring tube, which is connected to the front pressure gauge. An overflow pipe for limiting the tank container filling volume is led out from the rear of the tank container, and an overflow valve is installed on the overflow pipe. The tank container is equipped with a shell blasting device and a vacuum extraction device. A vacuum gauge valve is provided at the lower rear end of the tank container, and the vacuum gauge valve is connected to the vacuum measuring device.

[0011] A booster pipe is provided at the bottom of the above-mentioned tank container, in which a booster liquid phase valve is installed. The rear end of the booster liquid phase valve is connected to the pump booster liquid inlet valve and the booster vaporizer via a tee. The rear end of the pump booster liquid inlet valve is connected to the liquid outlet of the cryogenic pump. The rear end of the booster vaporizer is connected to the residual gas discharge valve and the booster gas phase valve via a tee. The rear end of the booster gas phase valve is connected to the top of the tank container via a booster explosion-proof pipe. A second pipeline safety valve is additionally provided at the front end of the booster gas phase valve.

[0012] The boost explosion-proof pipe is bypassed with a pressure regulating stop valve and a manual vent valve, the rear end of the pressure regulating stop valve is connected to a pressure reducing regulating valve, and the rear ends of the pressure reducing regulating valve and the manual vent valve are both connected to the drain valve.

[0013] The above-mentioned boost explosion-proof pipe is bypass-connected with a three-way switching valve and a gas phase analysis valve; the second interface of the three-way switching valve is connected to the first container safety valve and the first bursting disc, and the third interface of the three-way switching valve is connected to the second container safety valve and the second bursting disc; the outlet of the gas phase analysis valve is connected to the gas phase analysis interface.

[0014] A liquid phase pipe of a liquid phase meter is provided at the bottom of the above-mentioned tank box, and a gas phase pipe of a liquid phase meter is provided at the top of the tank box; the liquid phase pipe of the liquid phase meter is connected to a liquid phase valve of the liquid phase meter, and the liquid phase valve of the liquid phase meter is connected to a liquid level gauge balancing valve and a liquid level meter through a tee; the gas phase pipe of the liquid phase meter is connected to a liquid phase valve of the liquid phase meter, and the gas outlet end of the gas phase valve of the liquid phase meter is respectively connected to the other end of the liquid level gauge balancing valve and the first pressure gauge.

[0015] The above-mentioned emergency shut-off valve is connected to a control air circuit for controlling the emergency shut-off valve away from the operating box. The second emergency control valve, the first emergency control valve, the filter pressure reducer and the manual reversing valve are installed in sequence in the control air circuit, and the manual reversing valve is connected to the emergency shut-off valve control.

[0016] Compared with the prior art, the top liquid inlet pipe of the present invention is provided with a top liquid inlet external valve, and the bottom liquid inlet pipe is provided with a bottom liquid inlet external valve. The top liquid inlet external valve and the bottom liquid inlet external valve are connected to a liquid inlet interface via a liquid inlet main pipe, so that liquid can be simultaneously introduced from the top and bottom of the tank box when the tank box is filled with liquid. The liquid inlet end of the cryogenic pump is connected to the bottom liquid inlet pipe via a liquid inlet pump valve. In this way, a section of the bottom liquid inlet pipe can be directly used as a discharge pipe connected to the liquid inlet end of the cryogenic pump. The liquid outlet end of the cryogenic pump is connected to a liquid unloading pipe, and the liquid discharge end of the liquid unloading pipe is installed with a pump outlet interface. The pump outlet interface is a quick-charging card seat, which is convenient for connecting and unloading. The present invention ensures the safety of the tank box by opening or closing the valve installed in the pipeline, and realizes smooth switching operations between filling and unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a process flow diagram of the present invention.

[0018] The accompanying drawings are marked as follows: tank 1, bottom liquid inlet pipe 2, top liquid inlet pipe 3, liquid unloading pipe 4, reflux pipe 5, booster pipe 6, cryogenic pump PUMP, bottom liquid inlet external valve V-1, top liquid inlet external valve V-2, liquid inlet interface C-1, emergency shut-off valve EV1, third pipeline safety valve SV-3, liquid inlet pump valve V-21, pump outlet liquid interface C-4, pump outlet liquid valve V-20, check valve CV-1, fifth pipeline safety valve SV-5, first residual liquid discharge valve V-3A, liquid phase analysis valve V-15, liquid phase analysis interface C-2, sixth pipeline safety valve SV-6, fourth pipeline safety valve SV-4, second residual liquid discharge valve V-3B, reflux valve V-19, pump rear pressure gauge valve V-13B, pump outlet pressure gauge P3, vehicle front pressure gauge valve V-13A, vehicle front pressure gauge P2, overflow valve V-8, shell blasting device BD-2, vacuum pump Device TC-1, vacuum gauge valve V-14, vacuum measuring device TE-1, booster liquid phase valve V-4, pump boost liquid inlet valve V-22, booster vaporizer PBC, residual gas discharge valve V-6, booster gas phase valve V-5, second pipeline safety valve SV-2, pressure regulating stop valve V-17, manual vent valve V-12, pressure reducing and regulating valve PV, drain valve V-16, three-way switching valve V-7, gas phase analysis valve V-18, first container safety valve SV-1A, first bursting disc BD-1A, second container safety valve SV-1B, second bursting disc BD-1B, gas phase analysis interface C-3, liquid phase meter liquid phase valve V-9, liquid level gauge balancing valve V-10, liquid level gauge L1, liquid phase meter gas phase valve V-11, first pressure gauge P1, second emergency control valve EM2, first emergency control valve EM1, filter pressure reducer FR, manual reversing valve TS-1. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0020] like Figure 1As shown, the present invention discloses a valve control system for a cryogenic liquid transport vehicle with an external pump. The system is applied to a cryogenic liquid transport vehicle with an external pump and is used to ensure the safety of the tank box 1 on the cryogenic liquid transport vehicle. The tank box 1 is composed of an outer container and an inner container located inside the outer container. A vacuum insulation layer is formed between the outer container and the inner container. The inner container of the tank box 1 is used to store cryogenic liquid. The external pump on the cryogenic liquid transport vehicle is a cryogenic pump PUMP. The cryogenic pump PUMP is used to unload the cryogenic liquid in the tank box 1 into the cryogenic liquid storage tank of the user unit. In order to ensure the convenience and safety of the cryogenic liquid during filling, unloading and transportation, the present invention is provided with a top liquid inlet pipe 3 on the top of the tank box 1. The part of the top liquid inlet pipe 3 extending into the inner container is provided with multiple spray holes, and the liquid is introduced in a spraying manner when filling. A bottom liquid inlet pipe 2 is provided at the bottom of the tank box 1. The port of the bottom liquid inlet pipe 2 extending into the inner container is equipped with an anti-vortex device. The anti-vortex device is used to prevent the cryogenic liquid from generating vortices and affecting the pressure drop of the cryogenic pump PUMP. The liquid inlet end of the top liquid inlet pipe 3 is connected to the top liquid inlet external valve V-2. This valve is a normally closed valve that opens only during filling and unloading. When filling a fixed-point storage tank, it serves as the gas phase outlet valve. The liquid inlet end of the bottom liquid inlet pipe 2 is connected to the bottom liquid inlet external valve V-1. This valve is also a normally closed valve and serves as the liquid discharge valve when unloading a fixed-point storage tank. The liquid inlet ends of the top liquid inlet external valve V-2 and the bottom liquid inlet external valve V-1 are connected to the liquid inlet port C-1 via the liquid inlet manifold. This port is a fast-filling connector that connects to the liquid infusion device via a metal infusion hose for filling the tank container 1. The bottom liquid inlet pipe is equipped with an emergency shut-off valve EV1 and a third pipeline safety valve SV-3. The emergency shut-off valve EV1 is a normally closed valve designed for rapid closure in emergencies and for use during maintenance. The third pipeline safety valve SV-3 is used to protect the safety of the bottom liquid inlet pipe 2. When the pressure in the pipeline is higher than its set opening pressure, the third pipeline safety valve SV-3 automatically opens to release the system pipeline gas and protect the pipeline pressure from overpressure. The liquid inlet end of the cryogenic pump PUMP is connected to the liquid inlet valve V-21. The liquid inlet end of the liquid inlet valve V-21 is connected to the bottom liquid inlet pipe 2 and is located at the liquid outlet end of the bottom liquid inlet outer valve V-1. When the pump is used for liquid unloading operation, the liquid inlet valve V-21 is opened. At this time, a section in the bottom liquid inlet pipe 2 serves as a liquid outlet pipe, allowing cryogenic liquid to flow from the bottom liquid inlet pipe 2 through the liquid inlet valve V-21 into the cryogenic pump PUMP. The liquid outlet end of the cryogenic pump PUMP is connected to the unloading pipe 4. The discharge end of the unloading pipe 4 is equipped with a pump outlet interface C-4. The pump outlet interface C-4 is also a quick-charging card seat, which is convenient for connecting to the infusion metal hose to realize the unloading operation of the tank box 1. The discharge pipe 4 is equipped with a pump outlet valve V-20 and a check valve CV-1. The pump outlet valve V-20 is used to discharge cryogenic liquid from the tank truck when the cryogenic pump PUMP is turned on. The check valve CV-1 prevents the cryogenic liquid from flowing back.

[0021] In this embodiment, the liquid inlet manifold is connected to a fifth pipeline safety valve SV-5 and a first residual liquid discharge valve V-3A. A liquid analysis valve V-15 is connected to the bottom liquid inlet pipe 2 in a bypass manner, and the liquid outlet of this liquid analysis valve V-15 is connected to the liquid analysis interface C-2. The fifth pipeline safety valve SV-5 functions similarly to the third pipeline safety valve SV-3: both are used to protect the safety of the pipeline. The first residual liquid discharge valve V-3A is used to relieve pressure and purge the filling hose, discharging any residual gas, liquid, or impurities in the hose to the atmosphere. The hose cannot be removed until the pressure in the hose is released. This valve is normally closed and is only opened for hose removal and purging. The liquid analysis valve V-15 is also normally closed and is only opened for sampling and analysis of the cryogenic liquid within the tank container 1. The liquid analysis interface C-2 is used to facilitate sampling.

[0022] In this embodiment, a sixth pipeline safety valve SV-6 is connected to the unloading pipe 4, bypassing the pump outlet valve V-20. A fourth pipeline safety valve SV-4 and a second residual liquid discharge valve V-3B are connected to the unloading pipe 4 between the check valve CV-1 and the pump outlet port C-4 via a four-way connector. The functions of the sixth pipeline safety valve SV-6 and the fourth pipeline safety valve SV-4 are identical to those of the third pipeline safety valve SV-3. The second residual liquid discharge valve V-3B functions identically to the first residual liquid discharge valve V-3A.

[0023] In the embodiment, the liquid outlet of the cryopump PUMP is provided with a return pipe 5 connected to the top liquid inlet pipe 3. A return valve V-19 is installed in the pipeline of the return pipe 5. The liquid inlet end of the return valve V-19 is connected to the pump outlet pressure gauge valve V-13B via a tee. The pump outlet pressure gauge valve V-13B is connected to the pump outlet pressure gauge P3. The function of the return pipe 5 is to pre-cool the cryopump PUMP before unloading. The pre-cooling is carried out using the cryogenic liquid in the tank box 1. The cryogenic liquid in the tank box 1 returns to the tank box 1 through the bottom liquid inlet pipe 2, the liquid pump inlet valve V-21, the cryopump PUMP, the return pipe 5 and the top liquid inlet pipe 3. This cycle continues until the temperature of the cryopump PUMP reaches the temperature requirement for unloading. The pump outlet pressure gauge valve V-13B is used to control the inlet pressure of the pump outlet pressure gauge P3. When the pressure gauge is under maintenance, this valve is closed. In other states, the valve is normally open. The pump outlet pressure gauge P3 is used to display the pump outlet pressure. It is an oxygen pressure gauge and is oil-free.

[0024] In this embodiment, a pressure monitoring tube extends from the front end of the tank container 1. A front pressure gauge valve V-13A is installed on this tube, which is connected to a front pressure gauge P2. This valve controls the inlet pressure of the front pressure gauge P2. Positioned at the front end of the tank container 1 for easy viewing by the driver, it displays the internal pressure of the container within the tank container 1. This pressure gauge P2 is also an oxygen pressure gauge and is oil-free. An overflow tube extends from the rear of the tank container 1 to control the tank container 1's fill level. This overflow valve V-8 is installed on this overflow tube. Overflow valve V-8 determines whether the tank container 1 is full. When full, liquid overflows from this valve, limiting the fill level. Furthermore, when the container pressure is high, this valve is opened to release the internal pressure. This valve is open during filling and normally closed otherwise. The front end of the tank container 1 is also equipped with a shell bursting device BD-2. This device protects the outer shell of the tank container 1. When the vacuum insulation layer between the inner and outer containers collapses and reaches a certain internal pressure, it opens to release the interlayer gas to protect the outer shell. The rear end of the tank container 1 is also equipped with a vacuum pumping device TC-1. This device is used to create a vacuum to ensure a thermal insulation layer between the inner and outer containers.

[0025] In this embodiment, a booster pipe 6 is provided at the bottom of the tank container 1. A booster liquid-phase valve V-4 is installed within this pipe. The rear end of this valve is connected to a pump boost inlet valve V-22 and a booster vaporizer PBC via a tee. The rear end of this pump boost inlet valve V-22 is connected to the liquid outlet of the cryogenic pump PUMP. The rear end of the booster vaporizer PBC is connected to a residual gas discharge valve V-6 and a booster gas-phase valve V-5 via a tee. The rear end of this booster gas-phase valve V-5 is connected to the top of the tank container 1 via a booster explosion-proof pipe 7. A second pipeline safety valve SV-2 is installed at the front end of this booster gas-phase valve V-5. The booster vaporizer PBC is used to vaporize cryogenic liquid into cryogenic steam, which is then returned to the tank container 1, increasing the internal pressure for rapid liquid unloading. The pump boost inlet valve V-22 opens when the pressure in the tank is too low to increase the flow of the boost carburetor PBC, and closes when the pressure is sufficient.

[0026] In this embodiment, the boost explosion-proof pipe 7 is connected to a bypass valve (V-17) and a manual vent valve (V-12). The rear end of the pressure-regulating stop valve (V-17) is connected to a pressure-reducing pressure-regulating valve (PV). Both the rear ends of the pressure-reducing pressure-regulating valve (PV) and the rear ends of the manual vent valve (V-12) are connected to a drain valve (V-16). The pressure-reducing pressure-regulating valve (PV) automatically opens to reduce the pressure inside the tank when the pressure inside the tank is too high. If the pressure inside the tank exceeds the upper limit, the manual vent valve (V-12) can be opened to release the pressure to protect the vehicle. Discharge should be performed in an open area. The manual vent valve (V-12) is a normally closed valve.

[0027] In this embodiment, a three-way switching valve V-7 and a gas phase analysis valve V-18 are connected to the pressurized explosion-proof pipe 7 through a bypass connection. The second port of the three-way switching valve V-7 is connected to the first container safety valve SV-1A and the first bursting disc BD-1A, while the third port of the three-way switching valve V-7 is connected to the second container safety valve SV-1B and the second bursting disc BD-1B. The outlet of the gas phase analysis valve V-18 is connected to the gas phase analysis port C-3. The first and second container safety valves SV-1A and SV-1B protect the tank container 1 and automatically open to release gas from the gas phase space when the gas phase pressure in the inner container exceeds the set opening pressure.

[0028] In the embodiment, a liquid phase meter liquid phase pipe is provided at the bottom of the tank box 1, and a liquid phase meter gas phase pipe is provided at the top of the tank box 1; the liquid phase meter liquid phase pipe is connected to the liquid phase meter liquid phase valve V-9, and the liquid phase meter liquid phase valve V-9 is connected to the liquid level gauge balancing valve V-10 and the liquid level gauge L1 through a three-way connection; the liquid phase meter gas phase pipe is connected to the liquid phase meter gas phase valve V-11, and the gas outlet end of the liquid phase meter gas phase valve V-11 is respectively connected to the other end of the liquid level gauge balancing valve V-10 and the first pressure gauge P1.

[0029] In the embodiment, the emergency shut-off valve EV1 is connected to a control air circuit for controlling the emergency shut-off valve EV1 away from the operating box, and the second emergency control valve EM2, the first emergency control valve EM1, the filter pressure reducer FR and the manual reversing valve TS-1 are installed in sequence in the control air circuit, and the manual reversing valve TS-1 is connected to the control of the emergency shut-off valve EV1.

[0030] The liquid filling process of the present invention is as follows:

[0031] 1. Connect the liquid inlet port C-1 to the liquid source outlet using an infusion hose.

[0032] 2. Open the first residual liquid discharge valve V-3A and the liquid source outlet valve. After about 2 minutes, close the first residual liquid discharge valve V-3A to allow the infusion hose to fully cool.

[0033] 3. Slowly open the top inlet valve V-2 and the manual vent valve V-12 to fill the top of tank container 1. After about half an hour, open the bottom inlet valve V-1 and the emergency shut-off valve EV1 to continue filling both the top and bottom lines. Observe the pressure gauge reading during filling. If the pressure in the tank rises close to the delivery pressure, increase the liquid source pressure or open the manual vent valve V-12 to facilitate filling. If the pressure continues to rise, interrupt filling and wait until the pressure drops before resuming.

[0034] Observe the reading of the liquid level gauge L1. When the reading reaches 3 / 4 of the maximum filling volume, open the relief valve V-8. If liquid flows out, close the liquid source valve, and close the bottom liquid inlet external valve V-1, the top liquid inlet external valve V-2, the relief valve V-8, the manual vent valve V-12 and the emergency shut-off valve EV1.

[0035] Open the first residual liquid discharge valve V-3A to discharge the residual liquid in the pipeline and defrost the filling hose.

[0036] Note: During the filling period, the booster liquid phase valve V-4 and the booster gas phase valve V-5 are closed.

[0037] The liquid unloading process of the present invention is as follows:

[0038] 1. Connect the pump outlet port C-4 to the liquid receiving tank connector.

[0039] 2. Slowly open the reflux valve V-19, the pump discharge valve V-20, and the residual liquid discharge valve of the liquid receiving tank, and purge the liquid unloading hose. After about 2 minutes, close the pump discharge valve V-20 and the residual liquid discharge valve of the liquid receiving tank to allow the infusion hose to fully cool.

[0040] 3. Open the emergency shut-off valve EV1 and the liquid inlet valve V-21 to fill the cryogenic pump PUMP with liquid, discharge the gas in the pump, and lower the pump temperature to the operating temperature.

[0041] 4. Turn on the cryogenic pump PUMP and open the pump outlet valve V-20 to deliver liquid to the receiving tank. Open the booster liquid valve V-4 and booster gas valve V-5 to increase the pressure in the tank. At this time, adjust the return valve V-19 to control the flow rate. Close the return valve V-19 after it stabilizes.

[0042] Note: If the pressure inside the tank is too low, open the pump booster inlet valve V-22. The pressure inside the tank should not be lower than 0.1MPa.

[0043] 5. When the receiving tank is about to reach the filling requirement or the liquid in the tank truck is about to run out, slowly close the pump outlet valve V-20 and the receiving tank inlet valve, then turn off the cryogenic pump PUMP, and finally close the liquid inlet pump valve V-21, the supercharger liquid phase valve V-4 and the supercharger gas phase valve V-5.

[0044] 6. Open the residual gas discharge valve V-6 and the second residual liquid discharge valve V-3B to discharge the residual gas and liquid in the pipeline and defrost the filling hose. Alternatively, open the reflux valve V-19 to recover the gas in the pipeline back into the tank. After the residual liquid is discharged, close the residual gas discharge valve V-6 and the second residual liquid discharge valve V-3B.

[0045] Emergency operations are as follows:

[0046] When operating liquid inflow and outflow and an emergency requires immediate shutoff due to an emergency, manual reversing valve TS-1 can be operated to quickly close the emergency shutoff valve EV1, shutting off the liquid. Manual reversing valve TS-1 is located inside the control box. If the control box is inaccessible, the second emergency control valve EM2 and the first emergency control valve EM1 can be operated at the front of the vehicle for rapid closure.

[0047] The best embodiment of the present invention has been described, and various changes or modifications can be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. A valve control system for a cryogenic liquid transport vehicle with an external pump, comprising a tank (1) and a cryogenic pump (PUMP) for pumping out the cryogenic liquid in the tank (1), wherein a top liquid inlet pipe (3) is provided at the top of the tank (1), and a bottom liquid inlet pipe (2) is provided at the bottom of the tank (1), and wherein: The liquid inlet end of the top liquid inlet pipe (3) is connected to the top liquid inlet external valve (V-2), the liquid inlet end of the bottom liquid inlet pipe (2) is connected to the bottom liquid inlet external valve (V-1), and the liquid inlet end of the top liquid inlet external valve (V-2) and the liquid inlet end of the bottom liquid inlet external valve (V-1) are connected to a liquid inlet interface (C-1) via a liquid inlet main pipe; an emergency shut-off valve (EV1) and a third pipeline safety valve (SV-3) are sequentially installed in the pipeline of the bottom liquid inlet pipe; the liquid inlet end of the cryogenic pump (PUMP) is connected to the bottom liquid inlet pipe (2) via a liquid inlet pump valve (V-21), the liquid outlet end of the cryogenic pump (PUMP) is connected to a liquid discharge pipe (4), the liquid discharge end of the liquid discharge pipe (4) is installed with a pump outlet interface (C-4), and the liquid discharge valve (V-20) and a check valve (CV-1) are sequentially installed in the pipeline of the liquid discharge pipe (4).

2. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 1, characterized in that: The liquid inlet main pipe is connected to a fifth pipeline safety valve (SV-5) and a first residual liquid discharge valve (V-3A); the bottom liquid inlet pipe (2) is bypass-connected to a liquid phase analysis valve (V-15), and the liquid outlet of the liquid phase analysis valve (V-15) is connected to a liquid phase analysis interface (C-2).

3. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 2, characterized in that: The liquid unloading pipe (4) is connected to a sixth pipeline safety valve (SV-6) at the front end of the pump outlet valve (V-20) through a bypass, and the liquid unloading pipe (4) is connected to a fourth pipeline safety valve (SV-4) and a second residual liquid discharge valve (V-3B) via a four-way joint on the pipeline between the check valve (CV-1) and the pump outlet interface (C-4).

4. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 3, characterized in that: The liquid outlet end of the cryogenic pump (PUMP) is provided with a reflux pipe (5) connected to the top liquid inlet pipe (3), and a reflux valve (V-19) is installed in the pipeline of the reflux pipe (5). The liquid inlet end of the reflux valve (V-19) is connected to the pump rear pressure gauge valve (V-13B) through a three-way connection, and the pump rear pressure gauge valve (V-13B) is connected to the pump outlet pressure gauge (P3).

5. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 4, characterized in that: An air pressure monitoring tube is led out from the upper front end of the tank box (1), and a front pressure gauge valve (V-13A) is installed on the air pressure monitoring tube, and the front pressure gauge valve (V-13A) is connected to the front pressure gauge (P2); an overflow pipe for limiting the filling amount of the tank box (1) is led out from the rear of the tank box (1), and an overflow valve (V-8) is installed on the overflow pipe; the tank box (1) is provided with a shell blasting device (BD-2) and a vacuum pumping device (TC-1); a vacuum gauge valve (V-14) is provided at the lower rear of the tank box (1), and the vacuum gauge valve (V-14) is connected to a vacuum measuring device (TE-1).

6. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 5, characterized in that: A booster pipe (6) is provided at the bottom of the tank box (1), and a booster liquid phase valve (V-4) is installed in the booster pipe (6). The rear end of the booster liquid phase valve (V-4) is connected to a pump booster liquid inlet valve (V-22) and a booster vaporizer (PBC) via a three-way connection. The rear end of the pump booster liquid inlet valve (V-22) is connected to the liquid outlet of a cryogenic pump (PUMP). The rear end of the booster vaporizer (PBC) is connected to a residual gas discharge valve (V-6) and a booster gas phase valve (V-5) via a three-way connection. The rear end of the booster gas phase valve (V-5) is connected to the top of the tank box (1) via a booster explosion-proof pipe (7). A second pipeline safety valve (SV-2) is additionally provided at the front end of the booster gas phase valve (V-5).

7. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 6, characterized in that: The boost explosion-proof pipe (7) is connected to a bypass with a pressure regulating stop valve (V-17) and a manual vent valve (V-12); the rear end of the pressure regulating stop valve (V-17) is connected to a pressure reducing pressure regulating valve (PV); the rear ends of the pressure reducing pressure regulating valve (PV) and the rear end of the manual vent valve (V-12) are both connected to a sewage valve (V-16).

8. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 7, characterized in that: The boost explosion-proof pipe (7) is connected to a three-way switching valve (V-7) and a gas phase analysis valve (V-18) in a bypass manner; the second interface of the three-way switching valve (V-7) is connected to a first container safety valve (SV-1A) and a first bursting disc (BD-1A), and the third interface of the three-way switching valve (V-7) is connected to a second container safety valve (SV-1B) and a second bursting disc (BD-1B); the outlet of the gas phase analysis valve (V-18) is connected to a gas phase analysis interface (C-3).

9. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 8, characterized in that: The bottom of the tank box (1) is provided with a liquid phase meter liquid phase pipe, and the top of the tank box (1) is provided with a liquid phase meter gas phase pipe; the liquid phase meter liquid phase pipe is connected to the liquid phase meter liquid phase valve (V-9), and the liquid phase meter liquid phase valve (V-9) is connected to the liquid level meter balancing valve (V-10) and the liquid level meter (L1) through a three-way connection; the liquid phase meter gas phase pipe is connected to the liquid phase meter gas phase valve (V-11), and the gas outlet end of the liquid phase meter gas phase valve (V-11) is respectively connected to the other end of the liquid level meter balancing valve (V-10) and the first pressure gauge (P1).

10. The valve control system for a cryogenic liquid transport vehicle with an external pump according to claim 9, characterized in that: The emergency shut-off valve (EV1) is connected to a control air circuit for controlling the emergency shut-off valve (EV1) away from an operating box. A second emergency control valve (EM2), a first emergency control valve (EM1), a filter pressure reducer (FR) and a manual reversing valve (TS-1) are sequentially installed in the control air circuit. The manual reversing valve (TS-1) is control-connected to the emergency shut-off valve (EV1).

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