CN114772538B - A portable and portable marine methanol filling pump skid device and its use method - Google Patents

Abstract

The invention discloses a mobile portable methanol filling pump prying device for a ship and a use method thereof, belonging to the technical field of environmental protection ships, the device comprises a car unloading module, a conveying module and a ship loading module which are sequentially connected, the car unloading module comprises a car unloading hose and a car unloading quick connector, the delivery module comprises a delivery pipe, a delivery pump and a check valve, wherein the delivery pump and the check valve are arranged on the delivery pipe, the shipment module comprises a tail pipe, a shipment quick connector and a shipment hose, a first purging port is arranged on the delivery pipe, and a second purging port is arranged on the tail pipe. According to the invention, nitrogen can be introduced into the pipeline to seal the pipeline before methanol is filled, and the pipeline can be purged after formaldehyde is filled, so that the nitrogen seal of the whole system is realized; the pressure balance module is initially arranged, so that the working smoothness of the unloading pump is ensured, and the personal safety of site operators is ensured; the methanol residual liquid in the pipeline of the pump prying device can be collected, and partial pressure protection can be realized; the utility test program is simplified, the movement is convenient, and the utility test program can be connected with a plurality of tank cars quickly and safely.

Description

A portable and portable marine methanol filling pump skid device and its use method

Technical Field

The invention belongs to the technical field of environmentally friendly ships, and in particular relates to a mobile and convenient ship-use methanol filling pump skid device and a use method thereof.

Background Art

In view of the continuous improvement of environmental protection requirements, ships using methanol as fuel are becoming increasingly popular. Before methanol-fueled ships are built or modified and put into operation, their fuel systems need to be tested for effectiveness. Methanol is flammable and explosive, and its volatile gases are toxic. Leakage is easy to spread, and it can form an explosive mixture when mixed with air. There is currently no special equipment in China or even internationally that matches these effectiveness tests.

Summary of the invention

Technical problem: In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a mobile and convenient marine methanol filling pump skid device to realize the convenient, fast and safe filling of methanol fuel from tank trucks to ships.

Technical solution: In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

A mobile and convenient marine methanol filling pump skid device comprises an unloading module, a conveying module and a loading module which are connected in sequence, the unloading module comprises an unloading hose and an unloading quick connector, the conveying module comprises a delivery pipe and a transport pump and a check valve arranged on the delivery pipe, the loading module comprises a tail pipe, a loading quick connector and a loading hose, the delivery pipe is provided with a first purge port, and the tail pipe is provided with a second purge port.

Preferably, it further comprises a pressure balancing module, wherein the pressure balancing module comprises a return air joint, a return air pipeline and a return air branch pipe.

Preferably, it further comprises a waste liquid collection module, wherein the waste liquid collection module comprises a collection pipe and a collection port, and the collection pipe is connected to the delivery pipe.

Preferably, the collecting pipe is connected to the tail pipe and the return air pipeline respectively.

Preferably, the number of the conveying modules is one or more, and the multiple conveying modules are connected in parallel.

Preferably, the delivery module further includes a filter, a flow meter and a plurality of pressure sensors.

Preferably, the return air pipeline is provided with a third purge port, and the return air branch pipe is provided with a fourth purge port.

The present invention also provides a method for using a mobile and convenient marine methanol filling pump skid device, comprising the following steps:

S1. Self-inerting of the pump skid device: Before connecting the tank truck and the ship, the interface between the quick connector 12 and the return air branch pipe 53 is sealed with a blind flange, and then all the valves of the passage from the pump skid device to the ship are opened. A nitrogen source is connected from the first purge port 211 and the fourth purge port 531 to purge the entire pump skid device. The purged exhaust gas is discharged from the ship loading quick connector 32 and the return air connector 51. After the gas replacement is completed through manual inspection at the end, all valves of the pump skid device are closed;

S2. Nitrogen sealing of the filling pipe: connect the unloading hose 11 to the tank truck, and connect the loading hose 33 to the ship. When connecting the hoses, always keep the nitrogen source connected from the first purge port 211 and the second purge port 311, maintain a small flow ventilation state, and ensure that the nitrogen in the hose is in a positive pressure flow state during the entire connection process, so as to ensure that the hose is in a nitrogen-sealed state after the connection hose is connected;

S3, nitrogen sealing of pressure balance module: when the return air branch pipe 53 is connected to the tank truck and the return air joint 51 is connected to the ship, the third purge port 521 and the fourth purge port 531 also maintain the small flow ventilation state connected to ensure nitrogen sealing;

S4, filling: close all purge ports, open the delivery pump 41, and the methanol in the tank truck enters the ship through the unloading hose 11, the delivery pipe 21 and the loading hose 33 under the operation of the transport pump 41;

S5, pressure balance: during the methanol filling process, the methanol volatile gas in the cabin returns to the tank truck through the return gas pipeline 52 and the return gas branch pipe 53, and the gas phase space of the tank truck and the gas phase space of the ship's fuel tank are connected to achieve pressure balance between the gas phase space of the tank truck and the gas phase space of the ship's fuel tank, while avoiding gas exchange between the gas phase space of the tank truck and the gas phase space of the ship's fuel tank and the atmosphere;

S6, purging: after the filling is completed, close the unloading valve on the tank truck, and introduce a nitrogen source from the first purge port 211 to purge the residual liquid in the pipeline of the pump skid device to the ship's fuel tank;

S7, re-inerting: close the main valve on the pump skid device close to the ship end, continue to introduce nitrogen source from the first purge port 211 and the fourth purge port 531 to purge the residual liquid in the pipeline to the waste liquid collection pipe for collection and treatment, so as to achieve nitrogen inerting of the entire pump skid system;

S8, hose inerting: close all valves on the pump skid device, and before removing the unloading hose 11 and the loading hose 33, open the gas-liquid phase valve on the tank truck and the gas-liquid phase valve on the ship, and introduce nitrogen through the first purge port 211 and the second purge port 311 respectively to purge the residual methanol vapor in the connecting hose to the tank truck and the ship, and then remove the connecting hose after the inerting is achieved.

Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. Multiple purge ports are set in the pump skid device, and nitrogen can be introduced to nitrogen-seal the pipeline before methanol filling, so as to avoid the formation of explosive mixed gas by methanol vapor and air in the pipeline, thereby improving the safety of the filling process. After formaldehyde filling, the pipeline can be purged to return the residual methanol liquid and methanol gas to the tank truck or ship cabin, and at the same time, the entire system can be nitrogen-sealed to ensure the safety of personnel when removing the tank truck connecting pipe and the ship-shore connecting pipe; 2. The pump skid device is the first to set a pressure balance module. The gas phase space of the tank truck and the gas phase space of the ship's fuel tank are connected to ensure the smooth operation of the unloading pump; it also ensures the sealing of the entire system and the personal safety of on-site operators; 3. A waste liquid collection module is set up to collect the residual methanol in the pipeline of the pump skid device. When the pipeline of the pump skid device is over-pressured, it can also provide pressure protection to ensure the safety of the device; 4. The pipeline of the entire device is closed, and there is no leakage of methanol. The modular skids integrated with various pipelines and equipment simplify the utility test procedures, are easy to move, and can be quickly and safely connected to multiple tank trucks at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a pipeline connection structure according to an embodiment of the present invention.

DETAILED DESCRIPTION

The present invention is further illustrated below in conjunction with specific examples. The examples are implemented based on the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

As shown in Figure 1, a mobile and convenient marine methanol filling pump skid device includes an unloading module 1, a conveying module 2 and a loading module 3 which are connected in sequence. The unloading module 1 is used to connect with a tank truck. The methanol in the tank truck is transported from the conveying module 2 to the loading module 3 and finally to the ship to be filled. The unloading module 1 includes two unloading hoses 11 and two unloading quick connectors 12 (the number can be set as needed). The unloading hose 11 is used to directly connect to the unloading pump outlet of the tank truck. The two unloading quick connectors 12 are respectively connected to the two conveying modules 2. Each conveying module 2 includes a conveying pipe 21 and a filter 43, a transport pump 41, a flow meter 44, a check valve 42 and two pressure sensors 45 arranged on the conveying pipe 21. The filter 43, the transport pump 41, the flow meter 44 and the check valve 42 are arranged in sequence on the conveying pipe 21 along the flow direction of methanol. The filter 43 adopts a Y-type filter, and the transport pump 41 adopts a gear pump. The two pressure sensors 45 are respectively arranged at the inlet and outlet ends of the transport pump 41 to monitor the conveying pressure in the conveying pipe 21. The two conveying pipes 21 are connected by a connecting pipe near the unloading quick connector 12, and a connecting valve is provided on the connecting pipe, so as to serve as backup for each other.

The loading module 3 includes a tail pipe 31, a loading quick connector 32, and a loading hose 33. The tail ends of the two delivery pipes 21 are connected to the tail pipe 31, so that the two delivery modules 2 are connected in parallel to the tail pipe 31. The tail pipe 31 is connected to the loading hose 33 through the loading quick connector 32. The loading hose 33 is used to connect to the ship, so as to add methanol to the ship. The tail pipe 31 is also provided with a pressure sensor to monitor the pressure in the pipeline, and the tail pipe 31 is also provided with a valve to control the on-off of the pipeline.

Since methanol is volatile, a pressure balancing module 5 is also provided. The pressure balancing module 5 includes a return air connector 51, a return air pipeline 52 and two return air branches 53. The return air connector 51 is used to connect to the fuel tank or storage tank on the ship, and the two return air branches 53 are used to connect to the tank truck. The volatile gas of methanol in the cabin passes through the return air pipeline 52 and returns to the tank truck via the two return air branches 53. The pressure balancing module is provided in the pump skid device. During the process of methanol unloading, the gas phase space of the tank truck and the gas phase space of the ship's fuel tank are connected, and the pressure balance of the gas phase space of the tank truck and the gas phase space of the ship's fuel tank is achieved, thereby ensuring the smooth operation of the unloading pump; and ensuring the sealing of the entire system, avoiding the gas exchange between the gas phase space of the tank truck and the gas phase space of the ship's fuel tank and the atmosphere, thereby preventing production safety accidents; and at the same time ensuring the personal safety of on-site operators.

The device also includes a waste liquid collection module 6, which includes a collection pipe 61 and a collection port 62. The collection pipe 61 is connected to the two delivery pipes 21, and the connection is arranged at the outlet end of the transport pump 41. The connection is connected to the valve and the safety valve. The valve is used to control the on-off of the pipeline, and the safety valve is used for overpressure protection; the collection pipe 61 is also connected to the tail pipe 31, and the connection is arranged near the confluence of the two delivery pipes 21; the collection pipe 61 is also connected to the return air pipeline 52 to collect the waste liquid in the return air pipeline 52, and the collection port 62 is used to connect to an external collection device to recover the waste liquid. A flame arrester separator 63 is also provided near the collection port 62 to prevent fire and explosion. A waste liquid collection module is arranged in the pump skid device. Firstly, when the filling pipeline is blocked or the ship filling pipeline is cut off in an emergency, the residual methanol liquid in the pipeline of the pump skid device can be collected into a special collection container through the pipeline of the waste liquid collection module through the waste liquid collection device and the flame arrester separator for centralized treatment; and when the pump skid pipeline is over-pressured, the over-pressured liquid can be collected into a special collection container through the waste liquid collection device and the flame arrester separator through the safety valve for centralized treatment.

A first purge port 211 is provided on each delivery pipe 21 near the unloading quick connector 12, and a second purge port 311 is provided on the tail pipe 31 near the loading quick connector 32. The purge port is used to connect nitrogen and use nitrogen to purge the pipeline. Multiple purge ports are provided in the device. After the device is connected, nitrogen can be connected through these purge ports to purge the air in the pump skid and the connecting pipeline to avoid the formation of explosive mixed gas between methanol vapor and air in the pipeline; and after the filling is completed, the methanol residual liquid in the entire pump skid system can be purged to the tank truck and the ship's fuel tank. A third purge port 521 is provided on the return air pipeline 52 near the return air connector 51, and a fourth purge port 531 is provided on each return air branch pipe 53 near the interface. The purge port is used to connect nitrogen and use nitrogen to purge the remaining methanol volatile gas or methanol liquid in the pipeline to return it to the tank truck or ship's cabin. The purge port for accessing nitrogen can realize nitrogen sealing of the entire system and ensure the safety of the equipment when removing the tank truck connecting pipe and the ship-shore connecting pipe.

Usage and process:

1. Self-inerting of the pump skid device: Before connecting the tank truck and the ship, the tank truck gas-liquid phase end (i.e., the interface between the two quick connectors 12 and the two return air branches 53) of the pump skid device is sealed with a blind flange, and then all the valves of the passage from the pump skid device to the ship are opened, and a nitrogen source is connected from the nitrogen purge port at the tank truck end (i.e., the first purge port 211 and the fourth purge port 531) to purge the entire pump skid device, and the purged exhaust gas is discharged from the pump skid device close to the ship end (i.e., the ship loading quick connector 32 and the return air connector 51). After the gas replacement is confirmed to be completed through manual inspection at the end, all valves of the pump skid device are closed.

2. Nitrogen sealing of the filling pipe: After the pump skid device itself is inerted, the unloading hose 11 is connected to the tank truck, and the loading hose 33 is connected to the ship. When connecting the hoses, the nitrogen source is always connected from the first purge port 211 and the second purge port 311 interface, and a small flow ventilation state is maintained. During the entire connection process, the nitrogen in the hose is ensured to flow under positive pressure to ensure that the hose is nitrogen-sealed after the connection hose is connected.

3. Nitrogen sealing of the pressure balance module: When the return air branch pipe 53 is connected to the tank truck and the return air joint 51 is connected to the ship, the third purge port 521 and the fourth purge port 531 also maintain a small flow ventilation state to ensure nitrogen sealing;

4. Filling: Close all purge ports and open the delivery pump 41. The methanol in the tank truck enters the ship through the unloading hose 11, the delivery pipe 21 and the loading hose 33 under the operation of the transport pump 41.

5. Pressure balance: During the methanol filling process, the volatile methanol gas in the cabin returns to the tank truck through the return air pipeline 52 and the return air branch pipe 53. The gas phase space of the tank truck and the gas phase space of the ship's fuel tank are connected to achieve pressure balance between the gas phase space of the tank truck and the gas phase space of the ship's fuel tank, while avoiding gas exchange between the gas phase space of the tank truck and the gas phase space of the ship's fuel tank and the atmosphere.

6. Purging: After the filling is completed, close the unloading valve on the tank truck, and introduce a nitrogen source from the first purge port 211 to purge the residual liquid in the pipeline of the pump skid device to the ship's fuel tank.

7. Re-inerting: After the purge is completed, close the main valve on the pump skid device close to the ship end, and continue to introduce nitrogen source from the first purge port 211 and the fourth purge port 531 to purge the residual liquid in the pipeline to the waste liquid collection pipe for collection and treatment, so as to achieve nitrogen inerting of the entire pump skid system.

8. Hose inerting: Close all valves on the pump skid device. Before removing the unloading hose 11 and the loading hose 33, open the gas-liquid phase valves on the tank truck (the valve for gas and the valve for liquid) and the gas-liquid phase valves on the ship, and introduce nitrogen through the first purge port 211 and the second purge port 311 respectively to purge the residual methanol vapor in the connecting hose to the tank truck and the ship. After the connecting hose is inerted, remove the connecting hose.

Before the initial methanol filling, the ship's methanol fuel tank or storage tank needs to be cleaned and inerted with nitrogen to make the oxygen content in the tank less than 0.5%, thereby achieving nitrogen sealing (micro-positive pressure) of the tank; then, the methanol in the tank truck is transferred to the ship's fuel tank through the pipeline through the device using an unloading pump, and the volatile gas generated in the process is transported to the dock tank truck through the return air pipe to achieve pressure balance between the tank truck and the ship's tank. The pipelines and hose connections of the pump skid device are all sealed connections, so that methanol is fully sealed and filled during the entire filling process, which is safe and efficient. Since the pipelines, transport pumps and valves in the device are in the form of an integrated skid, they are modularly arranged, convenient for mobile transportation, and simplify the utility experiment process.

The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims (3)

1. The utility model provides a remove portable marine methanol filling pump sled device's application method, its characterized in that, remove portable marine methanol filling pump sled device includes car unloading module (1), delivery module (2) and shipment module (3) that connect gradually, still includes pressure balance module (5) and waste liquid collection module (6), car unloading module (1) including car unloading hose (11) and car unloading quick-operation joint (12), delivery module (2) including conveyer pipe (21) and transportation pump (41) and check valve (42) that set up on conveyer pipe (21), shipment module (3) including tail pipe (31), shipment quick-operation joint (32), shipment hose (33) are equipped with first purge port (211) on conveyer pipe (21), be equipped with second purge port (311) on tail pipe (31), pressure balance module (5) including return air joint (51), return air line (52) and return air branch (53), be equipped with third port (52) on return air line (52), return air branch (53) are equipped with third purge port (53) collection pipe (61) and collection pipe (61) are connected with conveyer pipe (61), the collecting pipe (61) is respectively connected with the tail pipe (31) and the return air pipeline (52);

the using method comprises the following steps:

S1, inerting a pump prying device: before connecting a tank car and a ship, closing the interface of the quick connector (12) and the air return branch pipe (53) by using a blind flange, then opening all passage valves from the pump prying device to the ship, blowing the whole pump prying device by introducing nitrogen sources from a first blowing port (211) and a fourth blowing port (531), discharging blown waste gas from the shipment quick connector (32) and the air return connector (51), and closing all valves of the pump prying device after the tail end is subjected to manual detection and confirmation of the completion of gas replacement;

S2, filling a pipe for nitrogen sealing: connecting a unloading hose (11) with a tank car, connecting a loading hose (33) with a ship, and always keeping a nitrogen source connected from a first purging port (211) and a second purging port (311) in the process of connecting the hoses, so as to keep a small-flow ventilation state, and ensuring a positive-pressure nitrogen ventilation state in the hoses in the whole connecting process so as to ensure that the inside of the hoses is also in a nitrogen sealing state after the connecting hoses are communicated;

s3, nitrogen sealing of the pressure balancing module: when the air return branch pipe (53) is connected with the tank wagon and the air return joint (51) is connected with the ship, the third purging port (521) and the fourth purging port (531) also keep a small flow ventilation state of the connection, so that nitrogen seal is ensured;

s4, filling: closing all purge ports, opening a conveying pump (41), and enabling methanol in the tank car to enter the ship through a unloading hose (11), a conveying pipe (21) and a loading hose (33) under the operation of the conveying pump (41);

s5, pressure balance: in the methanol filling process, methanol volatile gas in the cabin returns to the tank wagon through a return air pipeline (52) through a return air branch pipe (53), and the gas phase space of the tank wagon is communicated with the gas phase space of the ship fuel cabin, so that the pressure balance of the gas phase space of the tank wagon and the gas phase space of the ship fuel cabin is realized, and meanwhile, the gas exchange between the gas phase space of the tank wagon and the gas phase space of the ship fuel cabin and the atmosphere is avoided;

S6, purging: after filling, closing a unloading valve on the tank wagon, and introducing a nitrogen source from the position of a first purging port (211) to purge residual liquid in a pump prying device pipeline to a ship fuel tank;

S7, inerting: closing a main valve on the pump prying device, which is close to the ship end, continuously introducing a nitrogen source from a first purging port (211) and a fourth purging port (531) to purge residual liquid in the pipeline into a waste liquid collecting pipe for collection treatment, and realizing nitrogen inerting of the whole pump prying system;

S8, hose inerting: all valves on the pump prying device are closed, before the unloading hose (11) and the loading hose (33) are removed, the tank car gas-liquid phase valve and the ship gas-liquid phase valve are opened, nitrogen is respectively introduced through a first purging port (211) and a second purging port (311), residual methanol steam in the connecting hose is purged onto the tank car and the ship, and the connecting hose is removed after inerting of the connecting hose is realized.

2. The use method of the mobile portable marine methanol filling pump pry device according to claim 1, wherein the number of the conveying modules (2) is one or more, and a plurality of the conveying modules (2) are connected in parallel.

3. The method of using a mobile portable marine methanol filling pump skid as set forth in claim 1, wherein the transport module (2) further comprises a filter (43), a flow meter (44), and a plurality of pressure sensors (45).