Carbon dioxide storage tank with system monitoring function

Abstract

The present application relates to carbon dioxide storage tank, to solve the technical problems that the existing tank cannot simultaneously load and unload medium at both ends, and cannot obtain the medium state information in the tank in real time, and provides a carbon dioxide storage tank with system monitoring function, comprising a tank frame, a tank body, a secondary charging and discharging pipeline, a main charging and discharging pipeline and a data monitoring system; the secondary charging and discharging pipeline comprises a secondary liquid inlet pipeline and a secondary gas phase pipeline, and the secondary gas phase pipeline is used for balancing the gas phase pressure between the tank and external facilities; the main charging and discharging pipeline comprises a vent pipeline, a liquid outlet pipeline, a main gas phase pipeline, a main liquid inlet pipeline, a pressure relief pipeline and a liquid level monitoring pipeline arranged on the outer side wall of the rear end of the tank body from bottom to top; the main gas phase pipeline is used for balancing the gas phase pressure between the tank and external facilities; the liquid level monitoring pipeline is used for measuring the pressure and liquid level information of the medium in the tank; and the data monitoring system is used for remotely controlling the opening and closing of each valve assembly, and collecting the pressure and liquid level information of each pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to carbon dioxide storage tank, particularly to a carbon dioxide storage tank with system monitoring function. BACKGROUND

[0002] In recent years, with the development of intermodal equipment and the rise of green low-carbon industry, the demand for CCUS petroleum chemical industry field transportation and storage equipment is increasing. CCUS technology refers to carbon capture, utilization and storage technology. For the carbon dioxide generated in the industrial field, this technology is considered to be the most economical and feasible method for large-scale reduction of carbon emissions and mitigation of global warming in the future.

[0003] Liquid carbon dioxide fixed storage tank and mobile pressure tank have certain market, and the use density of mobile carbon dioxide tank container in the oil and gas well development process increases year by year. Compared with fixed storage tank, mobile carbon dioxide tank container is more widely used because of its convenient transportation and storage.

[0004] The existing carbon dioxide tank container sets the tank box filling and discharging pipeline or liquid loading and unloading pipe at one end of the container, and the other end of the container does not have the function of loading and unloading medium. However, due to the high equipment density in the fracturing construction area, it is often necessary to realize the functions of filling and unloading medium at both ends of the tank container to meet the normal operation of the overall pipeline system in the oil fracturing process. In addition, the existing carbon dioxide tank container does not have the functions of storing liquid carbon dioxide and matching with fracturing equipment, and cannot meet the pressure-bearing capacity of the container in the CCUS fracturing process, which cannot guarantee the safety of user production; and the tank containers cannot be used together, cannot be simultaneously controlled, and cannot obtain the medium state information in the tank container in real time, which is difficult to supervise the state of the tank container. SUMMARY

[0005] The purpose of the present application is to solve the technical problems that the existing carbon dioxide tank container cannot realize the loading and unloading of medium at both ends of the tank container, cannot store liquid carbon dioxide, cannot meet the pressure-bearing capacity of the container in the CCUS fracturing process, and cannot obtain the medium state information in the tank container in real time, and proposes a carbon dioxide storage tank with system monitoring function.

[0006] In order to achieve the above purpose, the technical solution of the present application is as follows:

[0007] A carbon dioxide storage tank with system monitoring function, comprising a tank box frame and a tank body installed in the tank box frame, characterized in that: it further comprises a secondary filling and discharging pipeline and a main filling and discharging pipeline respectively arranged on the outer side walls of the front and rear ends of the tank body, and a data monitoring system.

[0008] The tank body is provided with a sub-liquid inlet and a sub-gas phase inlet at the top of the front end side wall, a main liquid inlet, a main gas phase inlet and an upper liquid level inlet at the top of the rear end side wall, and a liquid discharge outlet and a pollution discharge outlet at the bottom of the rear end side wall;

[0009] The sub-liquid inlet pipe is connected with the sub-liquid inlet, and the sub-gas phase pipe is connected with the sub-gas phase inlet, and is used for balancing the gas phase pressure between the tank and external facilities and increasing the pressure inside the tank.

[0010] The main liquid inlet pipe is connected with the main liquid inlet, the main gas phase pipe is connected with the main gas phase inlet, and is used for balancing the gas phase pressure between the tank and external facilities, the pressure relief pipe is connected with the main gas phase inlet, the liquid level monitoring pipe is connected with the upper liquid level inlet at one end and with the pollution discharge outlet at the other end, and is used for measuring the pressure and liquid level information of the medium in the tank.

[0011] Valve assemblies are arranged between each of the connected inlets and pipes and between each of the pipes.

[0012] The data monitoring system is used for remotely controlling the opening and closing of each valve assembly and collecting the pressure and liquid level information of the liquid level monitoring pipe in real time.

[0013] Further, a pressure regulating pipe is arranged between the main gas phase pipe and the liquid discharge pipe, and a pressure regulating valve is arranged on the pressure regulating pipe, and is used for supplementing the pressure of the liquid discharge pipe through the main gas phase pipe.

[0014] Further, the valve assemblies arranged between each of the connected inlets and pipes include electrically controlled valves and manually controlled valves, the electrically controlled valves are electrically connected with the data monitoring system, and the data monitoring system is used for remotely controlling the opening and closing of each electrically controlled valve.

[0015] A safety valve is arranged between the electrically controlled valves and the manually controlled valves, and is used for preventing the medium in the pipe between the two groups of valves from damaging the valves and ensuring the safety of the tank.

[0016] Further, the data monitoring system includes an acquisition control system and a remote control system.

[0017] The collection control system is arranged on the outer side of the rear end of the tank box, and is used for collecting liquid level pressure information and liquid level change information on the liquid level monitoring pipeline and transmitting the collected electric signals to the remote control system after converting the electric signals into digital signals;

[0018] The remote control system is used for controlling the valve opening degree of each electric control valve and monitoring the liquid level state and pressure state of the tank body in real time.

[0019] Further, the liquid level monitoring pipeline comprises a liquid level meter and a differential pressure liquid level meter.

[0020] The upper pipeline and the lower pipeline of the liquid level meter are respectively connected to the upper liquid level pipe opening and the blowdown pipe opening, and are used for measuring the liquid level in the tank body.

[0021] The upper differential pressure pipeline of the differential pressure liquid level meter is connected to the upper pipeline of the liquid level meter, and the lower differential pressure pipeline is connected to the lower pipeline of the liquid level meter, and is used for measuring the liquid level pressure in the tank body.

[0022] The liquid level meter is provided with a liquid level transmitter, which is used for transmitting the liquid level information in the tank body to the data monitoring system.

[0023] The differential pressure liquid level meter is provided with a pressure transmitter, which is used for transmitting the pressure information in the tank body to the data monitoring system.

[0024] Further, the tank box frame is a hollow cuboid frame, comprising a front end frame, a rear end frame, two top transverse connecting frames and two bottom transverse connecting frames for connecting the top and the bottom of the front end frame and the rear end frame.

[0025] Four connecting corners on the front end frame and the rear end frame are each provided with a reinforcing inclined rod, and two vertical connecting rods on the front end frame and the rear end frame are each connected to the bottom transverse connecting frame through the reinforcing inclined rod, so as to ensure the stability of the tank box frame.

[0026] The two ends of the tank box body are respectively fixedly connected to the front end frame and the rear end frame through a secondary skirt and a primary skirt,

[0027] The inner sides of the two top transverse connecting frames are each provided with an inwardly extending walkway, so as to enable an operator to work on the top of the tank box frame.

[0028] Further, the rear end frame is provided with a rear end valve box, an operation platform and a ladder, the rear end valve box comprises a left door plate, a right door plate and a door plate mounting frame, the height of the door plate mounting frame is lower than the height of the rear end frame, the door plate mounting frame is fixedly installed on the rear end frame, and the left door plate and the right door plate are hingedly connected to the two sides of the door plate mounting frame.

[0029] The operation platform is installed on the rear end frame and above the rear end valve box, the lower end of the operation platform is hinged to the upper cross beam of the door plate mounting frame, the upper ends of the two sides are connected to the upper cross beam of the rear end frame through the lifting chains, when the lifting chains are stretched to the tension state, the operation platform is perpendicular to the rear end frame, when the lifting chains are contracted, the operation platform is parallel to the rear end frame;

[0030] A door lock assembly is further arranged between the upper end of the operation platform and the upper cross beam of the rear end frame, which is used for closing or opening the operation platform.

[0031] The ladder is fixed to one side of the rear end frame, which is used for the operator to climb from the lower side of the tank box frame to the upper side for operation.

[0032] The safety rope is connected between the upper cross beams on the top of the front end frame and the rear end frame, which is used for ensuring the safety of the operator.

[0033] Further, the outlet end of the venting pipeline is located at the top end of the main charging and discharging pipeline, and the outlet end is provided with an anti-blocking structure for preventing the internal icing of the main charging and discharging pipeline from causing safety accidents due to poor pressure release of the tank body or pipeline.

[0034] The anti-blocking structure comprises a horizontal through pipe, a U-shaped through pipe and a vertical through pipe connected in sequence at the outlet end of the venting pipeline, and the opening end of the U-shaped through pipe faces upward, which is used for preventing the backflow of liquid or impurities into the venting pipeline.

[0035] Further, the outer surface of the tank box body is further provided with a heat preservation assembly for heat preservation and protection of the tank box body.

[0036] The heat preservation assembly comprises a foamed heat preservation layer and a heat preservation skin arranged in sequence from inside to outside on the outer surface of the tank box body, and the heat preservation skin is fixed on the tank box body through the heat preservation fixing belt.

[0037] The foamed heat preservation layer is a polyurethane foamed layer, and the heat preservation skin is an aluminum color plate heat preservation skin.

[0038] The front end head of the tank box body is provided with a manhole for the operator to overhaul the inside of the tank body.

[0039] Further, the front end frame is provided with a front end valve box, the front end valve box comprises a front end valve frame fixed on the front end frame and a front door plate, the upper cross beam of the front end valve frame is hinged to the upper end of the front door plate, and a door lock assembly is arranged between the lower cross beam of the front end valve frame and the lower end of the front door plate.

[0040] A mirror surface observation plate is arranged on the outer side wall of the front end of the tank box body and located at the upper end of the auxiliary gas phase pipeline, which is used for observing the opening degree indication of the electric control valve on the auxiliary gas phase pipeline.

[0041] The beneficial effects of the present application are:

[0042] The carbon dioxide storage tank with system monitoring function can meet various functional requirements in the short-term storage of liquid carbon dioxide medium and the CCUS fracturing process, realizes the use requirement of remote intelligent monitoring operation of users, further improves the safety and reliability of the storage tank, effectively reduces the field work intensity and safety risk, guarantees the life safety and property safety of the operating personnel, reduces the labor intensity of the operating personnel through intelligent control, saves the labor cost, and improves the work efficiency.

[0043] The four connecting corners on the front end frame and the rear end frame are provided with reinforcing inclined rods, the overall rigidity and stability of the tank frame are increased, meanwhile, the two ends of the tank body are welded to the front end frame and the rear end frame through the auxiliary skirt and the main skirt respectively, the tank and the tank frame are connected as a whole, meanwhile, the gap between the thermal insulation layers can be shielded, and the tank body is more beautiful.

[0044] The safety rope is arranged at the top of the tank body as a safety protection device for the operator working at a high place, the life safety of the operating personnel is guaranteed, and the safety performance of the tank body structure is significantly improved.

[0045] The anti-blocking structure arranged at the outlet end of the venting pipeline can effectively prevent liquid or impurities from flowing back to block the pipeline, guarantee the pressure relief performance of the venting pipeline, avoid poor pressure release caused by the blockage of the tank body or the loading and unloading pipeline, and greatly improve the safety and reliability of the loading and unloading pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a structural schematic view of an embodiment of the carbon dioxide storage tank with system monitoring function;

[0047] Figure 2 is an installation position schematic view of the main charging and discharging pipeline in the embodiment of the application;

[0048] Figure 3 is an installation position schematic view of the auxiliary charging and discharging pipeline in the embodiment of the application;

[0049] Figure 4 is a structural schematic view of the main charging and discharging pipeline in the embodiment of the application;

[0050] Figure 5 is a structural schematic view of the auxiliary charging and discharging pipeline in the embodiment of the application;

[0051] Figure 6 is a pipeline connection schematic view of the main charging and discharging pipeline, the auxiliary charging and discharging pipeline and the tank body in the embodiment of the application;

[0052] Figure 7This is a schematic diagram of the structure of the tank body and the tank frame in an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the rear valve box structure in an embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of the external structure of the tank body in an embodiment of the present invention;

[0055] Icon labels:

[0056] 1-Tank frame, 2-Tank body, 3-Secondary filling / drainage pipeline, 4-Main filling / drainage pipeline, 5-Secondary liquid inlet, 6-Secondary vapor phase inlet, 7-Main liquid inlet, 8-Main vapor phase inlet, 9-Liquid level inlet, 10-Unloading inlet, 11-Sewage outlet, 12-Secondary liquid inlet pipeline, 13-Secondary vapor phase pipeline, 14-Vent pipeline, 15-Liquid outlet pipeline, 16-Main vapor phase pipeline, 17-Main liquid inlet pipeline, 18-Pressure relief pipeline, 19- Pressure regulating pipeline, 20-Level gauge, 21-Differential pressure level gauge, 22-Front end frame, 23-Rear end frame, 24-Top transverse connecting frame, 25-Bottom transverse connecting frame, 26-Reinforcing diagonal brace, 27-Walkway, 28-Rear end valve box, 29-Operating platform, 30-Ladder, 31-Safety rope, 32-Anti-clogging structure, 33-Front end valve box, 34-Mirror observation plate, 35-Insulation component, 36-Data acquisition and control system. Detailed Implementation

[0057] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] This invention provides a carbon dioxide storage tank with system monitoring function, such as... Figure 1 As shown, it includes a tank frame 1 and a tank body 2 installed in the tank frame 1, as well as auxiliary feed pipes 3 and main feed pipes 4 respectively installed on the outer side walls at the front and rear ends of the tank body 2, and a data monitoring system.

[0059] like Figure 7 As shown, the tank frame 1 is a hollow cuboid frame, including a front frame 22, a rear frame 23, two top transverse connecting frames 24 and two bottom transverse connecting frames 25 for connecting the front frame 22 and the rear frame 23.

[0060] Four connecting corners on the front end frame 22 and the rear end frame 23 are provided with reinforcing diagonal rods 26, and the two vertical connecting rods on the front end frame 22 and the rear end frame 23 are connected with the bottom transverse connecting frame 25 through the reinforcing diagonal rods 26, so as to ensure the stability of the tank box frame 1, increase the overall rigidity and stability of the tank box frame 1, facilitate the welding of the two ends of the tank body 2 to the front end frame 22 and the rear end frame 23 through the auxiliary skirt and the main skirt respectively, and make the tank body and the tank box frame 1 connected as a whole, so as to shield the gap between the thermal insulation layers and make the tank body more beautiful.

[0061] As shown in Figure 8 The rear end frame 23 is provided with a rear end valve box 28, an operation platform 29 and a ladder 30, the rear end valve box 28 includes a left door plate, a right door plate and a door plate mounting frame, the height of the door plate mounting frame is lower than the height of the rear end frame 23, the door plate mounting frame is fixedly installed on the rear end frame 23, the left door plate and the right door plate are hinged on the two sides of the door plate mounting frame, and the connecting end faces of the left door plate and the right door plate are provided with a door lock assembly for opening and closing the rear end valve box 28.

[0062] The operation platform 29 is installed on the rear end frame 23 above the rear end valve box 28, the lower end of the operation platform 29 is hinged with the upper cross beam of the door plate mounting frame, the upper ends of the two sides thereof are connected with the upper cross beam of the rear end frame 23 through a lifting chain, when the lifting chain is stretched to a tension state, the operation platform 29 is perpendicular to the rear end frame 23, when the lifting chain is contracted, the operation platform 29 is parallel to the rear end frame 23, and a door lock assembly is further arranged between the upper end of the operation platform 29 and the upper cross beam of the rear end frame 23 for closing or opening the operation platform 29; when the tank body is transported and stored, the operation platform is in a vertical closed state; when the tank body is used in a stacked state in a fracturing site, the door lock assembly on the operation platform is opened, the operation platform is turned to be horizontal, the lifting chain is stretched to a tension state, and then the operation platform becomes a working platform for the operator to operate the upper equipment.

[0063] The ladder 30 is fixed on one side of the rear end frame 23, and is used for the operator to climb from the lower side of the tank box frame 1 to the upper side thereof for operation;

[0064] The upper cross beams at the top of the front end frame 22 and the rear end frame 23 are connected with a safety rope 31 for ensuring the safety of the operator, the safety rope 31 includes a hanging ring, a chicken heart ring, a steel wire rope and a steel wire rope clamp, and is a safety protection device for the operator to operate on the top of the device;

[0065] A front valve box 33 is provided on the front frame 22. The front valve box 33 includes a front valve frame and a front door panel fixed on the front frame 22. The upper crossbeam of the front valve frame is hinged to the upper end of the front door panel, and a door lock assembly is provided between the lower crossbeam of the front valve frame and the lower end of the front door panel.

[0066] A mirror observation plate 34 is provided on the outer side wall at the front end of the tank body 2, at the upper end of the auxiliary gas phase pipeline 13, for observing the opening degree indication of the electrically controlled valve on the auxiliary gas phase pipeline 13.

[0067] The tank body 2 includes a tank body and tank heads welded to the front and rear sides of the tank body. The tank body 2 is welded to the front frame 22 and the rear frame 23 through the auxiliary skirt and the main skirt. A manhole is provided at the front end of the tank body 2 for operators to inspect the inside of the tank.

[0068] like Figure 7 As shown, an insulation component 35 is also provided on the outer surface of the tank body 2 for heat insulation and protection of the tank body 2; the insulation component 35 includes a foamed insulation layer and an insulation skin arranged sequentially from the inside to the outside on the outer surface of the tank body 2, and the insulation skin is fixed to the outer surface of the tank body 2 by insulation fixing straps; the foamed insulation layer is a polyurethane foam layer, and the insulation skin is an aluminum color plate insulation skin.

[0069] like Figure 6 , Figure 9 As shown, the tank body 2 has a secondary liquid inlet 5 and a secondary gas phase inlet 6 at the top near the front side wall; the tank body 2 has a main liquid inlet 7, a main gas phase inlet 8 and an upper liquid level inlet 9 at the top near the rear side wall; and the tank body 2 has a liquid discharge inlet 10 and a sewage outlet 11 at the bottom near the rear side wall.

[0070] like Figure 3 and Figure 5 , Figure 6 As shown, the auxiliary filling and draining pipeline 3 includes an auxiliary liquid inlet pipeline 12 and an auxiliary gas phase pipeline 13. When the discharge volume of the medium from the liquid outlet pipeline 15 in the main filling and draining pipeline 4 is insufficient or the speed is slow, the tank can be pressurized through the auxiliary filling and draining pipeline 3 to increase the unloading rate of the liquid medium. One end of the auxiliary liquid inlet pipeline 12 is connected to the auxiliary liquid inlet port 5, and the other end of the auxiliary liquid inlet pipeline 12 is provided with an auxiliary liquid delivery port for auxiliary filling of the medium into the tank. One end of the auxiliary gas phase pipeline 13 is connected to the auxiliary gas phase port 6, and the other end is provided with a pressure relief port for balancing the gas phase pressure between the tank and external facilities and for internal pressurization of the tank. To ensure the consistency and adaptability of the dimensions of the auxiliary filling and draining pipeline 3, the nominal dimensions of the auxiliary liquid inlet pipeline 12 and the auxiliary gas phase pipeline 13 are DN50 and DN40, respectively, which can be adapted to connect with external storage tanks.

[0071] To protect the safe operation between the auxiliary filling and discharging pipeline 3 and the valve assembly, a front valve box 33 is arranged outside the auxiliary filling and discharging pipeline 3,

[0072] The front valve box 33 is arranged on the front end frame 22 and includes a front valve frame fixed on the front end frame 22 and a front door plate, the upper beam of the front valve frame is hinged to the upper end of the front door plate, and a door lock assembly is arranged between the lower beam of the front valve frame and the lower end of the front door plate; the opening and closing angle of the front valve box 33 is not less than 180°, which can effectively ensure the convenience of the operation of the auxiliary filling and discharging pipeline 3.

[0073] A mirror observation plate 34 is arranged on the outer side wall of the front end of the tank box body 2 and located at the upper end of the auxiliary gas phase pipeline 13, which is used for observing the opening degree indication of the electric control valve on the auxiliary gas phase pipeline 13.

[0074] As shown in Figure 2 and Figure 4 , Figure 6 , the main filling and discharging pipeline 4 includes a venting pipeline 14, a liquid outlet pipeline 15, a main gas phase pipeline 16, a main liquid inlet pipeline 17, a pressure relief pipeline 18 and a liquid level monitoring pipeline arranged from bottom to top on the outer side wall of the rear end of the tank body;

[0075] The venting pipeline 14 is connected with the liquid outlet pipeline 15, the main gas phase pipeline 16, the main liquid inlet pipeline 17 and the blowdown pipe 11 through a plurality of connecting pipelines respectively, which is used for releasing the pressure in each pipeline, and the plurality of connecting pipelines are connected respectively to facilitate the disassembly operation of each pipeline by the construction personnel, to ensure the safety of the operation, and also can be used for the residual liquid discharge operation after the unloading of the medium in the pipeline is completed; the outlet end of the venting pipeline 14 is located at the top end of the main filling and discharging pipeline 4, and a anti-blocking structure 32 is arranged at the outlet, which is used for automatic discharge when rain, snow or impurities accumulate in the pipeline; the main gas phase pipeline 16 is used for balancing the gas phase pressure between the tank box and the external facilities.

[0076] The anti-blocking structure 32 includes a horizontal through pipe, a U-shaped through pipe and a vertical through pipe connected in sequence at the outlet end of the venting pipeline 14, the opening end of the U-shaped through pipe faces upward, which is used for preventing the backflow of liquid or impurities into the venting pipeline 14 and preventing the safety accidents caused by the poor pressure release of the tank body or the pipeline due to the icing blockage in the main filling and discharging pipeline 4.

[0077] One end of the liquid outlet pipeline 15 is communicated with the liquid discharge pipe 10, and the other end is provided with a liquid outlet. Two valve assemblies are connected in series on the liquid outlet pipeline 15, wherein the end part is a group of electric control valves, which are convenient for remote control by the operator, and the root part is a group of hand control valves. In order to improve the liquid discharge speed, the size of the liquid outlet pipeline 15 is generally DN100. Since the nominal size of the liquid outlet pipeline 15 is large, when the tank is placed on the ground, it is convenient to connect with the ground loading and unloading pipeline. The height position of the liquid outlet pipeline 15 should be low to ensure that the bending deformation of the loading and unloading pipeline after connection is within a reasonable range, and to prevent leakage of the connection surface during liquid discharge;

[0078] One end of the main liquid inlet pipeline 17 is connected with the main liquid inlet pipe 7, and the other end is provided with a main liquid inlet;

[0079] One end of the main gas phase pipeline 16 is communicated with the main gas phase pipe 8, and the other end is connected with a pressure relief valve for balancing the pressure between the tank and the main loading and unloading pipeline 4. A pressure regulating pipeline 19 is further arranged between the main gas phase pipeline 16 and the liquid outlet pipeline 15. The pressure regulating pipeline 19 is provided with a pressure regulating valve for supplementing the pressure of the liquid outlet pipeline 15 through the main gas phase pipeline 16 before liquid discharge, preventing the pressure gradient from being too large when the liquid carbon dioxide medium is discharged from the pipeline end in the initial stage of liquid discharge, and thus subliming into dry ice to cause pipeline blockage. The main liquid inlet pipeline 17 and the main gas phase pipeline 16 are connected with the current domestic liquid carbon dioxide tank truck or fixed type storage tank for convenience. The pipeline diameters are respectively set as DN50 and DN40.

[0080] One end of the pressure relief pipeline 18 is connected with the main gas phase pipe 8, and the other end is connected with the outlet end of the vent pipeline 14 through a pressure relief valve. The pressure relief pipeline 18 communicates the gas phase space inside the tank with the outside atmosphere, and is used for actively releasing the pressure in the tank. When the tank is stored for too long time, the liquid carbon dioxide medium is gasified due to temperature rise, which causes the internal pressure of the tank to rise above the designed allowable pressure. The pressure relief pipeline 18 actively controls the related valves to release pressure, ensuring the safe use of the tank.

[0081] The liquid level monitoring pipeline comprises a liquid level gauge 20 and a differential pressure liquid level gauge 21. The upper pipeline and the lower pipeline of the liquid level gauge 20 are connected to the upper liquid level pipe opening 9 and the blowdown pipe opening 11 respectively, for observing the liquid level inside the tank body. The upper differential pressure pipeline of the differential pressure liquid level gauge 21 is connected to the upper pipeline of the liquid level gauge 20, and the lower differential pressure pipeline is connected to the lower pipeline of the liquid level gauge 20, for measuring the liquid level pressure inside the tank body. The liquid level gauge 20 is a magnetic flap type liquid level gauge 20, which is arranged at the middle part of the main charging and discharging pipeline 4, covers the maximum filling capacity of the tank, and is convenient for directly observing the change of the medium in the tank during the loading and unloading process. A liquid level transmitter is arranged on the liquid level gauge 20, for transmitting the liquid level information inside the tank to the data monitoring system. A pressure transmitter is arranged on the differential pressure liquid level gauge 21, for transmitting the pressure information inside the tank to the data monitoring system. The pipelines of the liquid level gauge 20 and the differential pressure liquid level gauge 21 are provided with stop valves. When the differential pressure liquid level gauge 20 or the liquid level gauge 20 needs to be repaired, the stop valves can be actively closed to cut off the connection with the inside of the tank, so as to ensure the safety of disassembling and assembling the related instruments.

[0082] The valve assembly between each mutually connected pipe opening and pipeline comprises an electric control valve and a hand control valve. When one of the valves is abnormal, the other valve can ensure the normal use of the working performance of the entire pipeline. An electric control valve can be arranged on the liquid outlet pipeline 15, the main gas phase pipeline 16, the main liquid inlet pipeline 17, the auxiliary liquid inlet pipeline 12 and the auxiliary gas phase pipeline 13 according to actual use requirements. One or two hand control valves can be arranged on other pipelines, or an electric valve and a hand control valve can be arranged. The electric control valve is electrically connected to the data monitoring system, and the data monitoring system is used for remotely controlling the opening and closing of each electric control valve. A safety valve for pressure relief when the pipeline is abnormally over-pressurized is further arranged between each group of electric control valves and hand control valves or between hand control valves, so as to prevent the medium in the pipeline between the two groups of valves from damaging the valves and ensure the safety of the tank.

[0083] The data monitoring system is used for remotely controlling the opening and closing of each electric control valve, and real-time collection and monitoring of the pressure and liquid level information of the liquid level monitoring pipeline. Each group of electric control valves is used in cooperation with the data monitoring system, so as to realize the linkage control of the auxiliary charging and discharging pipeline 3 and the main charging and discharging pipeline 4 on a plurality of mutually connected tank boxes, greatly improve the operation efficiency of the tank box, and each group of electric control valves is a proportional control valve.

[0084] The data monitoring system comprises a collection control system 36 and a remote control system, which is a PC terminal, such as a desktop computer, a notebook computer, a tablet computer, etc. The PC terminal is installed with a control software, and the control system realizes remote intelligent control and monitoring of multiple tank containers. The software backs up the terminal control instructions and valve assembly states and stores them in a database, which can be queried through the software. The software communicates with each tank container based on TCP / IP protocol. The system has functions of adding, editing, deleting, and viewing tank containers.

[0085] The collection control system 36 is arranged on the outer side of the rear end of the tank container, and is used for controlling the valve opening degree of each electric control valve, collecting the liquid level pressure information and liquid level change information on the liquid level monitoring pipeline, and transmitting the collected electric signals to the remote control system after converting them into digital signals, so as to realize real-time monitoring of the liquid level state and pressure state of the tank body. The collection control system 36 comprises a PLC, a PLC analog quantity expansion module, a signal isolation grid, an Ethernet switch, a direct current power supply, an air switch, a power indicator light, and other electrical components, which are arranged in an electrical cabinet of the equipment valve box at the rear end. When working, an external power supply realizes 24V direct current power supply output through the built-in direct current power supply to supply power to each electrical component. The signal isolation grid isolates and processes the electric signals output by various sensors in the operation layer, and the electric signals are converted into digital signals by the PLC and the PLC analog quantity expansion module, and are transmitted to the remote control system. The remote control system outputs valve control signals, which are converted into digital signals by the isolation grid, the PLC, and the PLC analog quantity expansion module, and are output to the proportional control electric valve. The proportional control valve can control the valve opening degree by different electric signals. When the liquid level of the tank container reaches a set value, an audible and visual early warning is performed through a relay circuit. The pressure transmitter and the liquid level transmitter can monitor the state of the equipment.

[0086] All the above-mentioned pipelines and pipelines are made of stainless steel seamless pipes, which can be processed by bending or combined and welded by pipes and pipe fittings according to the process conditions. The end of each pipeline is provided with a joint connected with the loading and unloading system, and the interface form is not limited and can be set according to the specific use requirements.

[0087] The carbon dioxide storage tank in this embodiment can be connected to the main liquid inlet pipeline 17 of the main filling and discharging pipeline 4 through the liquid phase loading and unloading hose when multiple tanks are connected for filling, and slowly fills the tank with liquid. Then the pressure relief pipeline 18 can be opened, and the continuous filling can also be used to discharge the medium in the tank body to the outside world. When it is confirmed that the purity of the discharged gas meets the requirements, the valve assembly on the pressure relief pipeline 18 is closed, the gas phase loading and unloading pipeline is connected to the main gas phase pipeline 16, and the valve assembly on the main gas phase pipeline 16 is opened. At this time, the medium can be normally filled into the tank until the end. The filling amount of the medium should not exceed the maximum filling amount defined by the tank design. The tank liquid level and pressure indication should be continuously observed during the filling process to ensure the safety and stability of the filling process.

[0088] When the amount of liquid carbon dioxide in the tank is insufficient during the use of the tank, the tank can be used for emergency filling using the auxiliary liquid inlet pipeline 12 and the auxiliary gas phase pipeline 13 in the auxiliary filling and discharging pipeline 3. The filling method is the same as the above process.

[0089] When discharging liquid, the valve assembly on the pressure regulating pipeline 19 between the liquid outlet pipeline 15 on the main filling and discharging pipeline 4 and the main gas phase pipeline 16 should be opened first, and the liquid phase loading and unloading hose should be slowly inflated. When the internal pressure of the loading and unloading pipeline reaches the required value, the valve assembly on the liquid outlet pipeline 15 can be opened for discharging operation. When the discharging rate is insufficient, the tank body can be pressurized through the auxiliary gas phase pipeline 13 to forcibly increase the discharging rate, but the pressure in the tank should not be greater than the maximum allowable working pressure.

[0090] During the loading and unloading of liquid, the opening and closing of the electric control valve on the related pipeline can be controlled through the data monitoring system. When the valve assembly is a hand control valve, the opening of the hand control valve can also be controlled to flexibly control the pipeline flow.

Claims

1. A carbon dioxide storage tank having a system monitoring function, comprising a tank frame (1) and a tank body (2) installed in the tank frame (1), characterized in that: Further comprising a secondary charging and discharging pipeline (3) and a main charging and discharging pipeline (4) respectively arranged on the outer side wall of the front and rear ends of the tank body (2), and a data monitoring system; The tank body (2) is provided with a secondary liquid inlet (5) and a secondary gas phase inlet (6) on the top near the front end side wall; the tank body (2) is provided with a main liquid inlet (7), a main gas phase inlet (8) and an upper liquid level inlet (9) on the top near the rear end side wall; the tank body (2) is provided with a liquid discharge outlet (10) and a pollution discharge outlet (11) on the bottom near the rear end side wall; The secondary charging and discharging pipeline (3) comprises a secondary liquid inlet pipeline (12) and a secondary gas phase pipeline (13), one end of the secondary liquid inlet pipeline (12) is connected with the secondary liquid inlet (5); one end of the secondary gas phase pipeline (13) is connected with the secondary gas phase inlet (6), which is used for balancing the gas phase pressure between the tank and external facilities and increasing the internal pressure of the tank; The main charging and discharging pipeline (4) comprises a venting pipeline (14) arranged on the outer side wall of the rear end of the tank, a liquid outlet pipeline (15), a main gas phase pipeline (16), a main liquid inlet pipeline (17), a pressure relief pipeline (18) and a liquid level monitoring pipeline arranged from bottom to top on the outer side wall of the rear end of the tank; the venting pipeline (14) is used for releasing the pressure in each pipeline; one end of the liquid outlet pipeline (15) is communicated with the liquid discharge outlet (10); one end of the main liquid inlet pipeline (17) is connected with the main liquid inlet (7); one end of the main gas phase pipeline (16) is communicated with the main gas phase inlet (8); one end of the pressure relief pipeline (18) is connected with the main gas phase inlet (8); one end of the liquid level monitoring pipeline is connected with the upper liquid level inlet (9), and the other end is connected with the pollution discharge outlet (11), which is used for measuring the pressure and liquid level information of the medium in the tank; Valve assemblies are arranged between each of the connected inlets and pipelines, and between each of the pipelines; The data monitoring system is used for remotely controlling the opening and closing of each valve assembly, and collecting the pressure and liquid level information of the liquid level monitoring pipeline in real time.

2. The carbon dioxide storage tank with system monitoring function according to claim 1, wherein: A pressure regulating pipeline (19) is further arranged between the main gas phase pipeline (16) and the liquid outlet pipeline (15), and a pressure regulating valve is arranged on the pressure regulating pipeline (19), which is used for supplementing the pressure of the liquid outlet pipeline (15) through the main gas phase pipeline (16).

3. The carbon dioxide storage tank with system monitoring function according to claim 2, wherein: The valve assemblies between each of the connected inlets and pipelines comprise electrically controlled valves and manually controlled valves, the electrically controlled valves are electrically connected with the data monitoring system, and the data monitoring system is used for remotely controlling the opening and closing of each electrically controlled valve; A safety valve is arranged between the electrically controlled valves and the manually controlled valves, which is used for preventing the medium in the pipeline between the two groups of valves from being damaged due to abnormal pressure rise caused by gasification of the medium caused by temperature rise, and ensuring the safety of the tank.

4. The carbon dioxide storage tank with system monitoring function according to claim 3, wherein: The data monitoring system comprises a collection control system (36) and a remote control system; The collection control system (36) is arranged on the outer side of the rear end of the tank box, and is used for collecting liquid level pressure information and liquid level change information on the liquid level monitoring pipeline and transmitting the collected electrical signals to the remote control system after converting the electrical signals into digital signals; The remote control system is used for controlling the valve opening degree of each electric control valve and monitoring the liquid level state and pressure state of the tank body in real time.

5. The carbon dioxide storage tank with system monitoring function according to claim 4, wherein: The liquid level monitoring pipeline comprises a liquid level meter (20) and a differential pressure liquid level meter (21); The upper pipeline and the lower pipeline of the liquid level meter (20) are connected to the upper liquid level pipe opening (9) and the blowdown pipe opening (11) respectively, and are used for measuring the liquid level in the tank body; The upper differential pressure pipeline of the differential pressure liquid level meter (21) is connected to the upper pipeline of the liquid level meter (20), and the lower differential pressure pipeline is connected to the lower pipeline of the liquid level meter (20), and is used for measuring the liquid level pressure in the tank body; The liquid level meter (20) is provided with a liquid level transmitter, which is used for transmitting the liquid level information in the tank body to the data monitoring system; The differential pressure liquid level meter (21) is provided with a pressure transmitter, which is used for transmitting the pressure information in the tank body to the data monitoring system.

6. The carbon dioxide storage tank with system monitoring function according to claim 5, wherein: The tank box frame (1) is a hollow cuboid frame, comprising a front end frame (22), a rear end frame (23), two top transverse connecting frames (24) and two bottom transverse connecting frames (25) for connecting the top and the bottom of the front end frame (22) and the rear end frame (23); Four connecting corners on the front end frame (22) and the rear end frame (23) are each provided with a reinforcing inclined rod (26), and two vertical connecting rods on the front end frame (22) and the rear end frame (23) are each connected to the bottom transverse connecting frame (25) through the reinforcing inclined rod (26), so as to ensure the stability of the tank box frame (1); The two ends of the tank body (2) are fixedly connected to the front end frame (22) and the rear end frame (23) through the auxiliary skirt and the main skirt respectively, The inner sides of the two top transverse connecting frames (24) are each provided with an inwardly extending walkway (27), which is used for enabling the operator to work on the top of the tank box frame (1).

7. The carbon dioxide storage tank with system monitoring function according to claim 6, wherein: The rear end frame (23) is provided with a rear end valve box (28), an operation platform (29) and a ladder (30), the rear end valve box (28) comprises a left door plate, a right door plate and a door plate mounting frame, the height of the door plate mounting frame is lower than the height of the rear end frame (23), the door plate mounting frame is fixedly installed on the rear end frame (23), and the left door plate and the right door plate are hinged to the two sides of the door plate mounting frame. The operation platform (29) is installed on the rear end frame (23) and above the rear end valve box (28), the lower end of the operation platform (29) is hinged to the upper cross beam of the door plate mounting frame, the upper ends of the two sides are connected to the upper cross beam of the rear end frame (23) through a lifting chain, when the lifting chain is stretched to the tension state, the operation platform (29) is perpendicular to the rear end frame (23); when the lifting chain is contracted, the operation platform (29) is parallel to the rear end frame (23); A door lock assembly is further arranged between the upper end of the operation platform (29) and the upper cross beam of the rear end frame (23), which is used to close or open the operation platform (29); The ladder (30) is fixed on one side of the rear end frame (23), which is used for the operator to climb from the lower part of the tank box frame (1) to the upper part for operation; The upper cross beams at the top of the front end frame (22) and the rear end frame (23) are connected by a safety rope (31), which is used to ensure the safety of the operator.

8. The carbon dioxide storage tank with system monitoring function according to claim 7, characterized in that: The outlet end of the venting pipeline (14) is located at the top end of the main filling and discharging pipeline (4), and a anti-blocking structure (32) is arranged on the outlet end, which is used to prevent the internal icing of the main filling and discharging pipeline (4) from blocking and causing safety accidents due to poor pressure release of the tank body or pipeline; The anti-blocking structure (32) comprises a horizontal pipe, a U-shaped pipe and a vertical pipe connected in sequence at the outlet end of the venting pipeline (14), and the opening end of the U-shaped pipe faces upward, which is used to prevent liquid or impurities from flowing back into the venting pipeline (14).

9. The carbon dioxide storage tank with system monitoring function according to claim 8, characterized in that: A heat preservation assembly (35) is further arranged on the outer surface of the tank body (2), which is used to heat preservation protection of the tank body (2); The heat preservation assembly (35) comprises a foamed heat preservation layer and a heat preservation skin arranged in sequence on the outer surface of the tank body (2), and the heat preservation skin is fixed on the tank body (2) by a heat preservation fixing belt; The foamed heat preservation layer is a polyurethane foamed layer, and the heat preservation skin is an aluminum color plate heat preservation skin; A manhole is arranged at the front end head of the tank body (2), which is used for the operator to overhaul the inside of the tank.

10. The carbon dioxide storage tank with system monitoring function according to claim 9, characterized in that: A front end valve box (33) is arranged on the front end frame (22), which comprises a front end valve frame fixed on the front end frame (22) and a front door plate, the upper cross beam of the front end valve frame is hinged to the upper end of the front door plate, and a door lock assembly is arranged between the lower cross beam of the front end valve frame and the lower end of the front door plate; A mirror surface observation plate (34) is arranged on the outer side wall of the front end of the tank body (2) and above the upper end of the auxiliary gas phase pipeline (13), which is used to observe the opening degree indication of the electric control valve on the auxiliary gas phase pipeline (13).

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