Auxiliary operation method based on intelligent filling system

Abstract

The invention relates to the field of natural gas, in particular to an auxiliary operation method based on an intelligent filling system, and solves the safety and benefit problems of Dewar flask filling. Liquid is guided, after a filling liquid phase valve and a gas phase stop valve are fully opened, a rear gap bridge valve of a filling station is slightly opened, and the opening degree is kept within the range of 5-15 degrees within a circle; supercooling: when the outlet temperature of the BOG gasifier is less than or equal to-20 DEG C or the airflow vibration sound of the rear gap bridge valve disappears, closing the rear gap bridge valve; filling gun heads of the liquid-phase pipeline and the gas-phase pipeline are respectively connected with a liquid-phase angle valve and a gas-phase angle valve of the Dewar flask through the connecting pipe; and releasing the pressure, slowly opening a gun head stop valve of the filling gun head of the gas phase pipeline, confirming that no leakage exists at the joint of the filling gun head, and slowly opening a liquid phase angle valve of the Dewar flask. A traditional mode is optimized and improved, the filling efficiency is improved, the refilling quality is guaranteed, the filling safety is improved, human errors are reduced through a regular process, environmental protection and economic benefits are achieved, and the design and use requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of natural gas, in particular to an auxiliary operation method based on an intelligent filling system. BACKGROUND

[0002] The intelligent filling management system is controlled by a microcomputer, and the control system thereof provides three working modes of remote control, on-site control and manual mode. Generally, on-site control is adopted, specifically, a code scanning gun is used to scan the code on the body of the Dewar bottle. The data is updated in real time and managed uniformly, and information such as recharging personnel, weight, number, unit and the like is contained. The weight parameter of the Dewar bottle is monitored as an important standard for starting and stopping, and the action of the pneumatic valve is indirectly controlled to complete the filling. The filling facilities are similar, but the operation modes are obviously different. During filling, there are still a lot of normal temperature gas in the long pipeline, which will affect the filling efficiency and quality. For example, the gas disturbs the liquid, which hinders the liquid from entering the Dewar bottle, and part of the gas is liquefied again, which affects the quality after filling, and is easy to be pressurized and gasified. If the filling quality is poor, more LNG needs to be filled, which will also occupy more internal space and exceed the specified volume ratio. There is a lack of a more perfect, economical, environmentally friendly and safe auxiliary operation method to meet the needs of safe production and improve economic efficiency. SUMMARY

[0003] In view of the above technical problems, the present application provides an auxiliary operation method based on an intelligent filling system.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: an auxiliary operation method based on an intelligent filling system, comprising the following sequential steps:

[0005] (1) liquid introduction, after opening the filling liquid valve and the gas phase stop valve, the rear bridge valve of the filling station is slightly opened and the opening degree is kept at 5-15 degrees within one circle;

[0006] (2) subcooling, when the BOG gasifier outlet temperature is less than or equal to-20 DEG C or the vibration sound of the rear bridge valve disappears, the rear bridge valve is closed;

[0007] (3) pipe connection, the filling gun heads of the liquid phase pipeline and the gas phase pipeline are respectively connected to the liquid phase angle valve and the gas phase angle valve of the Dewar bottle;

[0008] (4) pressure release, the gun head stop valve of the filling gun head of the gas phase pipeline is slowly opened, it is confirmed that there is no leakage at the connection of the filling gun head, then the Dewar bottle gas phase angle valve is slowly opened to release the gas pressure, until the reading of the Dewar bottle pressure gauge is less than or equal to 0.25 Mpa;

[0009] (5) pre-filling, the gun head stop valve of the filling gun head of the liquid phase pipeline is slowly opened, it is confirmed that there is no leakage at the connection of the filling gun head, then the Dewar bottle liquid phase angle valve is slowly opened;

[0010] (6) Scan code, use the code scanning gun on the control panel to scan the code on the Dewar bottle to open the filling pneumatic valve;

[0011] (7) Jump stop, when the Dewar bottle reaches the filling weight, the control panel outputs a closing signal to the filling pneumatic valve;

[0012] (8) Primary discharge, close the gun head stop valve of the liquid phase pipeline filling gun head and the Dewar bottle liquid phase angle valve, open the front bridge valve of the filling station, and timely remove the filling gun head;

[0013] (9) Remove the pipe, close the gun head stop valve of the gas phase pipeline filling gun head and the Dewar bottle gas phase angle valve;

[0014] (10) Secondary discharge, close the gas phase stop valve and the filling liquid phase valve, and then fully open the rear bridge valve.

[0015] It also includes (11) liquid extraction, reversely connecting the filling gun head of the liquid phase pipeline at the gas phase angle valve of the Dewar bottle, opening the gas phase stop valve and the gun head stop valve of the liquid phase pipeline filling gun head.

[0016] In the (11) liquid extraction, the front bridge valve is continuously closed, and the dispersion valve of the liquid phase pipeline is opened.

[0017] In the (11) liquid extraction, the gas phase stop valve and the liquid phase pipeline dispersion valve are continuously closed, and the front bridge valve is opened.

[0018] It also includes (12) exhaust, opening the air temperature liquid inlet valve before (2) subcooling.

[0019] It also includes (13) inspection, after the filling is completed, the pressure of the first pressure gauge and the second pressure gauge is ≤0.3Mpa, and the temperature of the thermometer is ≥-15℃, otherwise, check the opening degree of the front bridge valve and the rear bridge valve to ensure that they are opened.

[0020] The auxiliary operation method based on the intelligent filling system provided by the application optimizes the traditional method, improves the filling efficiency, guarantees the recharging quality, improves the filling safety, reduces human errors through the standardized process, has environmental protection and economic benefits, and meets the design use needs. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a structural schematic diagram of the application;

[0022] Fig. 2 is a structural schematic diagram of the filling station of the application. DETAILED DESCRIPTION

[0023] As Figs. 1-2As shown, the entire filling system mainly involves filling station 1, air cooling zone 2, prying zone 3, storage tank zone, gasification zone 4 and diffusion tower 5. The storage tank zone is provided with liquid outlet main pipe 6, which is connected with air cooling zone 2 and filling station 1 respectively, and the outlets of air cooling zone 2 and filling station 1 converge into gasification zone 4, and finally lead to the municipal underground pipe network through prying zone 3. Air cooling zone 2 is provided with air cooling pneumatic valve 7 and air cooling liquid inlet valve 8, and filling station 1 is provided with filling liquid phase valve 9 and filling gas phase valve 10 at the branch pipe of liquid outlet main pipe 6. In addition, filling station 1 also includes EAG pipe connected with diffusion tower 5. Filling station 1 itself includes several filling stations, which are composed of liquid phase pipeline 11, gas phase pipeline 12, control console and filling gun head 13. Liquid phase pipeline 11 is sequentially provided with filling liquid phase valve 9, rear bridge valve 14, liquid phase stop valve 15, filling pneumatic valve 16, front bridge valve 17 and diffusion valve 18 from the inlet to the outlet, and gas phase pipeline 12 is sequentially provided with diffusion valve 18, gas phase stop valve 19 and filling gas phase valve 10 from the inlet to the outlet. It should be pointed out that the medium flow directions of gas phase pipeline 12 and liquid phase pipeline 11 are opposite, and the medium states in liquid phase pipeline 11 and gas phase pipeline 12 are different. Front bridge valve 17 and rear bridge valve 14 are both connected across gas phase pipeline 12, and front bridge valve 17 is connected on the side of gas phase stop valve 19 close to the outlet. The outlets of liquid phase pipeline 11 and the inlets of gas phase pipeline 12 are both flange-connected with filling hose and filling gun head 13. The control console is intelligent control, connected with weightometer and filling pneumatic valve 16, and the opening and closing of filling pneumatic valve 16 is adjusted through weight signal feedback, which is a mature technical means and will not be elaborated and limited here. In this embodiment, multiple filling stations are provided, branch pipes are led out from liquid phase pipeline 11 and gas phase pipeline 12, and corresponding opening and closing valves are provided. It also includes air pipeline connected with air compressor and pneumatic valve, and electric valve is provided at the air pipeline, and the electric valve is provided with wireless and pressing controlled emergency switch. Gasification zone 4 is provided with communicating BOG gasifier and reheater and separate EAG gasifier, and EAG gasifier communicates with diffusion tower 5. Dewar bottle, i.e. the main container for filling, has many specifications and styles, such as horizontal type, vertical type, full bottle 188 kg, 175 kg, etc., which are mature technical products. At the same time, dewar bottle is provided with gas phase angle valve, liquid phase angle valve, booster angle valve and matching safety valve, pressure gauge, and some products can also be provided with bursting disc. It should be noted that gun head stop valve is provided on filling gun head 13 to control the medium flow direction or opening and closing nearby. First pressure gauge is provided between front bridge valve 17 and filling pneumatic valve 16 to facilitate reading and understanding the situation inside the valve, and second pressure gauge and thermometer are provided between liquid phase stop valve 15 and filling liquid phase valve 9.

[0024] An auxiliary operation method based on an intelligent filling system, comprising the following sequential steps: priming, after opening the filling liquid phase valve 9 and the gas phase stop valve 19, slightly opening the rear bridge valve 14 of the filling station, and keeping the opening degree within 5°-15° of a circle. The priming function is to introduce the low-temperature LNG medium into the filling station 1, which plays a role in pre-cooling and exhausting, avoiding the influence of the subsequent filling pneumatic valve 16 and the dewar bottle. Frequent and long-time airflow disturbance may cause local bolt loosening due to vibration, or accelerate internal wear and tear. The exhaust part is that the gaseous medium is mostly at the top of the pipeline, a small part may contact the liquefied gas, and most of it will flow rapidly in the pipeline or separate from the low-cold LNG. The gaseous medium is discharged early into the gas phase pipeline 12, flows to the skid-mounted area 3 through the BOG recovery pipeline, and meets the environmental protection use needs. In contrast, not priming will cause a lot of cold waste, and strengthen the internal heat formed during the filling process, which will produce more gaseous medium. It should be noted that the larger the valve opening degree is not necessarily better, in order to minimize the direct discharge of LNG, the valve opening degree is selected to be within one circle, and slightly opened to about 5°-15°. That is, 5°-15° of a 360° circle, when multiple filling stations are operated, 5° is usually selected to avoid rapid pipeline cooling and not meet the normal filling standards. It should be noted that each filling station is relatively independent, and each station needs to be primed, which avoids the concentration of gaseous medium to a certain filling station, and also avoids the temperature of the branch pipe being insufficient to cause the gaseous medium to vaporize when the LNG liquid medium passes through.

[0025] Subcooling, when the BOG gasifier outlet temperature is ≤-20℃ or the airflow vibration sound of the rear bridge valve 14 disappears, the rear bridge valve 14 is closed. According to the instrument and meter use specification, the medium temperature of the skid-mounted area 3 cannot be too low, and generally, -20℃ is used as the critical value to judge, and the related valve of the priming is forced to be closed. In hot weather, it takes a long time to reach this temperature, so the actual priming situation is mainly used to judge the completion standard. As known to those skilled in the art, the gaseous or liquid or mixed state in the pipeline can be roughly judged by sound. Similarly, when the gaseous medium accounts for a high proportion in the pipeline, high-frequency vibration will occur at the corner or connection valve. In this embodiment, the priming is performed through the rear bridge valve 14, most of the vibration occurs at the pipeline and valve at this position, which is convenient for tightening and natural elimination, avoids affecting other key parts, reduces the maintenance frequency and pressure. After subcooling, that is, after pre-cooling, the pipeline reaches the standard temperature and the gas content is low, the rear bridge valve 14 needs to be closed, the subsequent LNG flow also has a cold preservation effect, and a large amount of frost will form on the surface of the pipeline to form a thick ice layer, without the need for exhaust and avoiding waste of LNG cold.

[0026] The liquid phase pipeline 11 and the gas phase pipeline 12 are connected to the liquid phase valve and the gas phase valve of the dewar bottle respectively, which is a mature technical means. In this embodiment, the L-shaped structure is designed for convenient connection, and the gun head is designed with a live joint to facilitate quick connection of different specifications of dewar bottle threaded heads. Here, it is not elaborated and limited. The pressure is released, the gun head stop valve of the filling gun head 13 of the gas phase pipeline 12 is slowly opened, it is confirmed that there is no leakage at the filling gun head 13, and then the gas phase valve of the dewar bottle is slowly opened to release the gas pressure until the dewar bottle pressure gauge reading is less than or equal to 0.25Mpa. When a new batch of dewar bottles to be filled is pulled, it may have been two or three days since it was used, the rotation time is relatively long, the internal participating liquid gradually vaporizes, and the internal pressure may rise to 1.4Mpa-1.6Mpa, corresponding to the take-off pressure of the two safety valves. The inspection period of the safety valve is one year, and the safety valve may fail and be stuck due to frequent handling, transportation and use within one year. Although the safety valve is arranged in pairs, many newly installed safety valves may be higher than the preset pressure, and the take-off is reduced to below the normal standard, which still has certain safety hazards. More importantly, the dewar bottle is instantaneously forced to move to the ground scale during the filling process, which may promote the take-off of the safety valve during the handling of the high pressure, which is relatively dangerous to the personnel. In addition, the high pressure in the bottle itself during filling, the loose leakage of the bottle valve, the gas jet of the bottle valve, and the backflow of the liquid phase pipeline 11, etc. It is absolutely beneficial to safety filling to quickly discharge the high pressure in the dewar bottle. At the same time, it is also helpful to recover the old quality natural gas in the bottle and provide LNG with better quality. In daily practice, the release of pressure can test whether the connection part leaks or not, and the release of the normal temperature gaseous medium is relatively safe.

[0027] The liquid phase pipeline 11 and the gas phase pipeline 12 are connected to the liquid phase valve and the gas phase valve of the dewar bottle respectively, which is a mature technical means. In this embodiment, the L-shaped structure is designed for convenient connection, and the gun head is designed with a live joint to facilitate quick connection of different specifications of dewar bottle threaded heads. Here, it is not elaborated and limited. The pressure is released, the gun head stop valve of the filling gun head 13 of the gas phase pipeline 12 is slowly opened, it is confirmed that there is no leakage at the filling gun head 13, and then the gas phase valve of the dewar bottle is slowly opened to release the gas pressure until the dewar bottle pressure gauge reading is less than or equal to 0.25Mpa. When a new batch of dewar bottles to be filled is pulled, it may have been two or three days since it was used, the rotation time is relatively long, the internal participating liquid gradually vaporizes, and the internal pressure may rise to 1.4Mpa-1.6Mpa, corresponding to the take-off pressure of the two safety valves. The inspection period of the safety valve is one year, and the safety valve may fail and be stuck due to frequent handling, transportation and use within one year. Although the safety valve is arranged in pairs, many newly installed safety valves may be higher than the preset pressure, and the take-off is reduced to below the normal standard, which still has certain safety hazards. More importantly, the dewar bottle is instantaneously forced to move to the ground scale during the filling process, which may promote the take-off of the safety valve during the handling of the high pressure, which is relatively dangerous to the personnel. In addition, the high pressure in the bottle itself during filling, the loose leakage of the bottle valve, the gas jet of the bottle valve, and the backflow of the liquid phase pipeline 11, etc. It is absolutely beneficial to safety filling to quickly discharge the high pressure in the dewar bottle. At the same time, it is also helpful to recover the old quality natural gas in the bottle and provide LNG with better quality. In daily practice, the release of pressure can test whether the connection part leaks or not, and the release of the normal temperature gaseous medium is relatively safe.

[0028] Code scanning, using the code scanning gun on the console to scan the code on the dewar bottle to open the filling pneumatic valve 16. Jump stop, after the dewar bottle reaches the filling weight, the console outputs a closing signal to the filling pneumatic valve 16. This is a mature technical means, which is not elaborated and limited here. Once the discharge, close the liquid phase pipeline 11 filling gun head 13 gun head stop valve and dewar liquid phase angle valve, open the front bridge valve 17 of the filling station, and timely remove the filling gun head 13. This is to discharge the residual LNG as much as possible after completing the filling to avoid moving the dewar bottle while the valve of the filling gun head 13 is in a state. It is also a common accidental phenomenon. It should be noted that LNG has a very strong gasification capacity and can expand by about 600 times at room temperature. A small amount of LNG has been gasified before it comes into contact with human skin, and even the heat on the surface of the human skin can form an effective barrier.

[0029] Pipe removal, close the gas phase pipeline 12 filling gun head 13 gun head stop valve and dewar gas phase angle valve. Secondary discharge, close the gas phase stop valve 19 and the filling liquid phase valve 9, and then fully open the rear bridge valve 14. Similarly, the secondary discharge is to discharge the residual liquid in the liquid phase pipeline 11 after the complete filling is completed, so that it enters the gas phase pipeline 12. When continuous operation is required, the liquid phase pipeline 11 is still connected to the liquid outlet main pipe 6, and there is no need to consider the problem of pressure retention or residual liquid. It also includes liquid extraction, which reversely connects the filling gun head 13 of the liquid phase pipeline 11 to the gas phase angle valve of the dewar bottle, and opens the gas phase stop valve 19 and the gun head stop valve of the filling gun head 13 of the liquid phase pipeline 11. The liquid extraction step is generally used in the case of overfilling, when the initial net bottle weight of the filled bottle is large, when the bottle is full of nitrogen, and the like. Due to the design features of the dewar bottle structure, liquid is fed from the bottom and gas is discharged from the top, so it is necessary to reversely pressurize and extrude the low-position liquid medium. The dewar bottle structure is a mature technical product, which is not elaborated and limited here. In this embodiment, the gas phase pipeline 12 is used to directly pressurize the gaseous medium to be recovered, which is environmentally friendly, efficient and safe. It should be noted that when the bottle is full of nitrogen, it is not recommended to directly extract and discharge into the gas phase pipeline 12, but to discharge into the atmosphere through the diffuser valve 18. Because nitrogen is also colorless and odorless, to ensure safety, the angle valve cannot be directly opened to diffuse into the air. In the liquid extraction, the front bridge valve 17 is continuously closed, and the diffuser valve 18 of the liquid phase pipeline 11 is opened. The diffuser valve 18 and the front bridge valve 17 cannot be opened at the same time, otherwise the gas in the gas phase pipeline 12 will be directly discharged into the atmosphere, causing pollution and waste.

[0030] The liquid extraction continues to close the gas phase stop valve 19 and the liquid phase pipeline 11 dispersion valve 18, and opens the front bridge valve 17. The closing of the gas phase stop valve 19 avoids the gaseous medium from being sprayed out in a large amount when the gun head stop valve of the filling gun head 13 is loosened, which is an accidental phenomenon easily caused by negligence after the completion of the filling operation. It also includes exhaust, opening the air temperature liquid inlet valve 8 before supercooling. When external medium pressure gas supply is needed, the gas supply operation can be combined with the filling operation, effectively guiding the large amount of gas flow in the liquid main pipe 6 to the air temperature vaporizer, and completing the liquid guiding precooling work of the filling as soon as possible. It also includes inspection, after the completion of the filling, the first pressure gauge and the second pressure gauge pressure ≤0.3Mpa, and the thermometer temperature ≥-15℃, otherwise check the opening degree of the front bridge valve 17 and the rear bridge valve 14 to ensure opening. In order to judge the situation in the pipeline, such as the residual liquid amount, whether the pressure continues to rise and whether the temperature is lower than-50℃ can be used to judge, and when the pressure gauge and the temperature gauge readings should be in the above numerical range.

[0031] Working principle summary: open the valve and make corresponding preparation, carry out liquid guiding, precooling and exhaust, and assist filling in formal operation according to the step sequence, instead of simply connecting and starting. Ensure the safety and environmental protection and energy saving of the operation, and avoid the waste of cold energy. In special situations, liquid extraction, liquid discharge and other operations can also be completed as soon as possible according to the opening and closing state of the valve, which is efficient and economical.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. At the same time, the basic principles, main features and advantages of the present application have been shown and described, and those skilled in the art should understand.

Claims

1. An auxiliary work method based on an intelligent refueling system, characterized by, Comprise the following sequential steps: (1) priming, after opening the filling liquid valve and gas phase stop valve, then slightly open the rear bridge valve of the filling station, and keep the opening degree within 5-15 degrees of a circle; (2) supercooling, when the BOG gasifier outlet temperature is less than or equal to-20℃ or the vibration sound of the rear bridge valve disappears, close the rear bridge valve; (3) connecting, connect the liquid phase pipeline and the gas phase pipeline filling gun head to the liquid phase angle valve and the gas phase angle valve of the dewar flask respectively; (4) pressure release, slowly open the gun head stop valve of the gas phase pipeline filling gun head, confirm that there is no leakage at the connection of the filling gun head, then slowly open the gas phase angle valve of the dewar flask to release the gas pressure until the pressure gauge reading of the dewar flask is less than or equal to 0.25Mpa; (5) pre-filling, slowly open the gun head stop valve of the liquid phase pipeline filling gun head, confirm that there is no leakage at the connection of the filling gun head, then slowly open the liquid phase angle valve of the dewar flask; (6) code scanning, use the code scanning gun on the control console to scan the code on the dewar flask to open the filling pneumatic valve; (7) stop, when the dewar flask reaches the filling weight, the control console outputs a closing signal to the filling pneumatic valve; (8) primary venting, close the gun head stop valve of the liquid phase pipeline filling gun head and the liquid phase angle valve of the dewar flask, open the front bridge valve of the filling station, and timely remove the filling gun head; (9) pipe removal, close the gun head stop valve of the gas phase pipeline filling gun head and the gas phase angle valve of the dewar flask; (10) secondary venting, close the gas phase stop valve and the filling liquid valve, then fully open the rear bridge valve.

2. The auxiliary work method based on the intelligent refueling system according to claim 1, characterized in that, It also includes (11) liquid extraction, connect the filling gun head of the liquid phase pipeline to the gas phase angle valve of the dewar flask, open the gas phase stop valve and the gun head stop valve of the liquid phase pipeline filling gun head.

3. The method of claim 2, wherein the smart refilling system is a system for refilling a cartridge with ink or toner. In the (11) liquid extraction, continue to close the front bridge valve and open the diffuser valve of the liquid phase pipeline.

4. The auxiliary work method based on the intelligent refueling system according to claim 2 or 3, characterized in that, In the (11) liquid extraction, continue to close the gas phase stop valve and the diffuser valve of the liquid phase pipeline, and open the front bridge valve.

5. The auxiliary work method based on the intelligent refueling system according to claim 1, characterized in that, It also includes (12) exhaust, open the air temperature liquid inlet valve before (2) supercooling.

6. The auxiliary work method based on the intelligent refueling system according to claim 1, characterized in that, It also includes (13) inspection, after the filling is completed, the pressure of the first pressure gauge and the second pressure gauge is less than or equal to 0.3Mpa, and the temperature of the thermometer is greater than or equal to-15℃, otherwise check the opening degree of the front bridge valve and the rear bridge valve to ensure opening.

Images