CN213293524U

CN213293524U - Storage tank safe nitrogen sealing nitrogen releasing breathing fire retardant function integration and intelligent management system

Info

Publication number: CN213293524U
Application number: CN202022064417.8U
Authority: CN
Inventors: 钟临风; 邹纯; 钟晓山
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-05-28
Anticipated expiration: 2030-09-18

Abstract

The utility model belongs to the technical field of liquid safety storage equipment and control in industries such as petroleum, chemical industry, pharmacy, etc., a storage tank safety nitrogen seal leaks nitrogen and breathes the integrated and intelligent management system of back-fire relief function, seal the nitrogen in the storage tank nitrogen seal system and seal the valve, leak nitrogen valve, breather valve, equipment functions such as spark arrester are integrated, and set up sensing and electrical control equipment and become the sled, realize storage tank real-time pressure monitoring through the computer control system, nitrogen seal the valve, leak nitrogen valve, breather valve switch control, system fault early warning, equipment trouble promptly controls, the control room is function such as artificial intervention control; the breathing valve is creatively realized to suck nitrogen, so that the quality of the liquid medium and the safety of the storage tank system are greatly improved; and the application of the breather valve in the traditional air suction working condition is reserved, multiple protection functions are added, and the safety risk brought by air suction is reduced. The pilot-operated pneumatic breather valve, the two-stage pilot-operated nitrogen-sealed nitrogen-releasing fire-retardant integrated valve and the storage tank nitrogen-sealed integrated interface of the products of multiple patents are applied to the system.

Description

Storage tank safe nitrogen sealing nitrogen releasing breathing fire retardant function integration and intelligent management system

Technical Field

The utility model belongs to trades liquid safety storage equipment and control technology neighbourhood such as oil, chemical industry, pharmacy provides a storage tank operation safety and intelligent management system.

Background

Many of liquid raw materials, intermediates, products and the like in the industries of petroleum, chemical industry, pharmacy and the like are highly volatile, toxic, flammable and explosive, and a nitrogen sealing system is generally equipped for an atmospheric storage tank used for storing the liquid. The existing nitrogen sealing system mainly has two problems, firstly, equipment such as a nitrogen sealing valve, a nitrogen release valve, a breather valve, an emergency release valve and a flame arrester in the nitrogen sealing system are respectively installed, and a plurality of holes are usually formed in the tank top, so that the leakage points of the storage tank are increased, more uncertain factors are considered in the design of the storage tank, the stress of the storage tank is more complex, the safety is tested, and the installation, maintenance and overhaul of the equipment are not facilitated. It would be an advance if such devices could be optimized, integrated, redundantly simplified, and skid-mounted, factory installed, tested, and then deployed to the field. Secondly, the existing nitrogen sealing system is relatively deficient in the aspects of intelligent monitoring, remote control, failure emergency and the like, and the safety and the environmental protection property are required to be improved. The utility model provides a scheme can solve above-mentioned problem effectively to can continue to extend and extend. The utility model relates to a function integration and intelligent management system, equipment in the system will relate to the patent that the oneself applied for: a pilot-operated pneumatic breather valve (patent number: ZL201810528703.X), a storage tank nitrogen-sealed integrated interface (patent number: ZL201711067459.3), and a two-stage pilot-operated nitrogen-sealed nitrogen-discharging fire-retardant integrated valve (patent number: ZL 201921749278.3).

Disclosure of Invention

The utility model relates to a storage tank safe nitrogen seals nitrogen leakage and breathes fire retardant function integration and intelligent management system, nitrogen in the storage tank nitrogen seal system equipment seals the equipment function integration such as valve, nitrogen leakage valve, breather valve, spark arrester to set up sensing and electrical control equipment and become the sled, realize storage tank real-time pressure monitoring through the computer control system, nitrogen seals valve, nitrogen leakage valve, breather valve switch control, system trouble early warning, equipment trouble is promptly controlled, functions such as control room artificial intervention control; the breathing valve is creatively realized to suck nitrogen or other flame-retardant gases, and the quality of the liquid medium and the safety of the storage tank system are greatly improved. And the application of the pilot-operated pneumatic breather valve (100) in the traditional air suction working condition can be reserved, and a protection function is added to make up the risk of the suction air to the safety of the storage tank system.

A skid-mounted system mainly composed of a pilot-operated pneumatic breather valve (100), a secondary pilot-operated nitrogen-sealed nitrogen-leaking fire-retardant integrated valve (200) and a suction-end nitrogen pressure reducing valve (307) is only provided with two interfaces connected with a storage tank, namely a pilot-operated pneumatic breather valve (100) bottom flange and a secondary pilot-operated nitrogen-sealed nitrogen-leaking fire-retardant integrated valve (200) bottom flange, as shown in figure 1. The two-stage pilot type nitrogen sealing and releasing fire retardant valve (200) controls the opening and closing of the valve ports of the nitrogen sealing valve end (209) and the nitrogen releasing valve end (210) through the two-stage pilot valve group (211), can realize the site adjustment of the nitrogen sealing set pressure and the nitrogen releasing set pressure, and is set as a reference value in a control computer (303). Set up integrative valve back-fire relief component (207) in integrative valve body (204), integrative valve pressure differential transmitter (202) are connected integrative valve upper chamber (205) and integrative valve lower chamber (206), and the circulation situation of monitoring integrative valve back-fire relief component (207) when the differential pressure value that integrative valve pressure differential transmitter (202) fed back to control computer (303) is greater than the default in the control computer, will report to the police and show integrative valve back-fire relief component (207) and need maintain the washing. Inlet nitrogen (308) is decompressed through a nitrogen sealing valve end (209) and enters the storage tank (309) through an integrated valve nitrogen inlet passage (208), and is buffered and mixed with gas in the tank; the lower cavity (206) of the integrated valve and the storage tank (309) form an equal-pressure cavity, the pressure of the secondary pilot valve group (211), the pressure of the exhalation-end pilot valve (105) and the pressure of the inhalation-end pilot valve (110) are obtained, and pressure signals can accurately reflect the pressure change of the storage tank and cannot be influenced by the impact of nitrogen inlet and nitrogen discharge of the secondary pilot type nitrogen-sealed nitrogen-discharge fire-retardant integrated valve (200) and the inhalation of exhalation airflow of the pilot type pneumatic respiration valve (100); the pressure transmitter (101) feeds the pressure of the storage tank (309) back to the control computer (303) for real-time monitoring. The opening and closing conditions of the valve ports of the nitrogen sealing valve end (209) and the nitrogen discharging valve end (210) are fed back to the control computer (303) by the nitrogen sealing end valve position switch (201) and the nitrogen discharging end valve position switch (203), when the pressure of the storage tank is in contact with the set pressure of the nitrogen sealing or the set pressure of the nitrogen discharging, the valve port of the nitrogen sealing valve end (209) or the nitrogen discharging valve end (210) acts, the control computer (303) also receives a valve position signal fed back by the nitrogen sealing end valve position switch (201) or the nitrogen discharging end valve position switch (203), and if the valve position signal is not received, the control computer (303) alarms to send the fault maintenance of the nitrogen sealing valve end (209), the nitrogen sealing end valve position switch (201) or the nitrogen discharging valve end (210) and the nitrogen discharging end valve position switch (203), and the equipment is maintained, as shown in figure.

The pressure signal air source of the pilot-operated pneumatic breather valve (100) is separated from the opening and closing air source of the breather valve, the air pressure of the storage tank is only used as a pressure signal and is introduced into the exhalation end pilot valve (105) and the inhalation end pilot valve (110) through a pressure guiding pipe (310), and compared with exhalation set pressure and inhalation set pressure, the change of the pressure signal determines the action of the pilot valve; the exhalation set pressure and the inhalation set pressure can be adjusted on site and are set as reference values in a control computer (303); two groups of breathing valve opening and closing control loops which are connected in parallel and interlocked are arranged, inlet nitrogen (308) is introduced through a working gas introducing pipe (306) to serve as a breathing valve opening and closing power gas source, one group of the breathing valve opening and closing control loops is subjected to pressure regulation through a filtering and reducing valve (107) and is controlled by a breathing-end pilot valve (105) and a suction-end pilot valve (110) to serve as a conventional control loop; the other group is regulated by a high-pressure filtering pressure reducing valve (102) and is controlled by a calling-end emergency control electromagnetic valve (104) and a suction-end emergency control electromagnetic valve (109) to be used as a fault state emergency control loop; the start-stop control loops of the exhalation end (113) and the inhalation end (111) are mutually independent; the set pressure of the filter pressure reducing valve (107) and the high-pressure filter pressure reducing valve (102) is adjusted according to the pressure of the inlet nitrogen (308), and the pressure of the high-pressure filter pressure reducing valve (102) is set to be about twice of that of the filter pressure reducing valve (107), so that a pressure gradient is formed.

When the pressure of the storage tank rises and reaches the preset exhalation pressure, the pilot valve (105) at the exhalation end acts, the working gas regulated by the filter pressure reducing valve (107) enters the lower cavity of the control cylinder (116) at the exhalation end, the exhalation end (113) is opened to release pressure, and the valve position switch (103) at the exhalation end feeds back an opening signal to the control computer (303). If the pressure of the storage tank is in a fault state, the pressure of the storage tank continues to rise, the control computer (303) sends out a yellow early warning signal of the system fault, when the feedback pressure of the pressure transmitter (101) touches the emergency calling opening pressure set by the control computer (303), the control computer (303) sends out a control signal to the emergency calling end control electromagnetic valve (104), the emergency calling end control electromagnetic valve (104) acts, a conventional calling end control loop is closed, the emergency calling end fault state control loop is opened, high-pressure working gas regulated by the high-pressure filtering and reducing valve (102) enters the lower cavity of the calling end control cylinder (116), the calling end (113) is opened forcefully for pressure relief, and the valve position switch (103) of the calling end feeds back the opening signal to the control computer (303). Along with pressure relief, when the pressure of the storage tank is lower than the emergent opening pressure of the calling out, the control computer (303) sends a control signal to the emergent control electromagnetic valve (104) at the calling out end, the emergent control electromagnetic valve (104) at the calling out end is reset, the emergent control loop at the fault state of the calling out end is closed, and the conventional control loop at the calling out end is opened; if normal pressure relief is continued at the moment, the opening fault of the calling end (113) is caused by the fact that the valve port cannot be opened due to bonding, the fault is eliminated, the storage tank returns to a normal working state in operation, and the yellow early warning signal of the system fault is relieved by the control computer (303). If the calling end (113) is closed at the moment and normal pressure relief cannot be continued, the fault of the conventional control circuit of the calling end is indicated, the control computer (303) switches the control pressure of the emergency control electromagnetic valve (104) of the calling end to the calling set pressure, so that the emergency control circuit takes over the conventional control circuit of the calling end to continue to start working in the fault state of the calling end, the conventional control circuit of the calling end is closed, and the control computer (303) alarms and dispatches the field emergency maintenance of the conventional control circuit of the calling end; after the fault of the conventional control loop of the calling end is eliminated, the yellow early warning signal of the system fault is relieved by the control computer (303). If the strong opening of the calling end (113) by the high-pressure working gas fails, the feedback pressure of the pressure transmitter (101) continues to rise, the control computer (303) sends an orange early warning signal of system fault, the liquid pumping of the storage tank is stopped at the moment, the emergency relief valve is concerned or the manhole of the storage tank is manually opened to relieve pressure according to the configuration of the safety equipment of the storage tank, the safety accident of the storage tank is avoided, and the control computer (303) alarms, dispatches the calling end (113) equipment and controls the field emergency maintenance of a loop; after the fault of the equipment and the control loop at the calling end (113) is eliminated, the orange early warning signal of the system fault is removed by the control computer (303), and the storage tank system returns to a normal working state.

When the pressure of the storage tank is reduced and reaches the suction set pressure, the suction-end pilot valve (110) acts, the working gas regulated by the filtering and reducing valve (107) enters the lower cavity of the suction-end control cylinder (117), the suction end (111) is opened to suck nitrogen, and the suction-end valve position switch (108) feeds back an opening signal to the control computer (303). If the pressure of the storage tank is continuously reduced due to opening failure, a control computer (303) sends out a yellow early warning signal of system failure, when the feedback pressure of the pressure transmitter (101) touches the suction emergency opening pressure set by the control computer (303), the control computer (303) sends out a control signal to a suction end emergency control electromagnetic valve (109), the suction end emergency control electromagnetic valve (109) acts, a suction end conventional control loop is closed, a suction end failure state emergency control loop is opened, high-pressure working gas regulated by a high-pressure filtering and reducing valve (102) enters a lower cavity of a suction end control cylinder (117), a suction end (111) is forcibly opened, and a suction end valve position switch (108) feeds back the opening signal to the control computer (303). Because the pressure signal of the storage tank is taken from the lower cavity (206) of the integrated valve, the nitrogen pressure reducing valve (307) at the suction end can be set to ensure that nitrogen with the pressure higher than the set pressure for exhalation is sucked into the storage tank without impacting the pressure signal, so that the storage tank can quickly supplement the pressure to a normal working state, and the risk that the pressure loss state is squashed by atmosphere is reduced. Along with the suction of nitrogen, when the pressure of the storage tank is higher than the suction emergency opening pressure, the control computer (303) sends a control signal to the suction end emergency control electromagnetic valve (109), the suction end emergency control electromagnetic valve (109) returns to the original position, the suction end failure state emergency control loop is closed, and the suction end conventional control loop is opened; if the nitrogen continues to be sucked normally at the moment, the opening fault of the suction end (111) is caused by the fact that the valve port cannot be opened due to bonding, the fault is eliminated, the storage tank returns to the normal working state when running, and the yellow early warning signal of the system fault is relieved by the control computer (303). If the suction end (111) is closed at the moment and normal suction can not be continued, the failure of the conventional suction end control circuit is described, the control computer (303) switches the control pressure of the emergency suction end control electromagnetic valve (109) to the suction set pressure, so that the emergency suction end control circuit takes over the conventional suction end control circuit to continue to start to work when the conventional suction end control circuit is in the failure state, the conventional suction end control circuit is closed, and the control computer (303) alarms and dispatches the field emergency maintenance of the conventional suction end control circuit; after the fault of the suction end conventional control loop is eliminated, the control computer (303) removes the yellow early warning signal of the system fault. If the suction end (111) is not opened by high pressure working gas with strong force and the feedback pressure of the pressure transmitter (101) continues to drop, the control computer (303) sends out a system fault orange early warning signal, at the moment, the liquid in the storage tank is stopped being pumped out, an emergency relief valve with a suction function or a manhole of the storage tank is manually opened for pressure compensation according to the configuration of safety equipment of the storage tank, the safety accident of the storage tank is avoided, and the control computer (303) alarms, dispatches the suction end (111) equipment and controls the field emergency maintenance of a loop; after the suction end (111) equipment and the control loop are cleared of faults, the control computer (303) removes the orange early warning signal of the system fault, and the storage tank system returns to a normal working state.

For the working condition that the valve port of the breather valve is easy to be bonded due to media, a regular pulse starting emergency control electromagnetic valve can be arranged in a control computer (303) to ensure that the valve port of the breather valve is opened by regular pulses, so as to avoid bonding; if the valve port of the breather valve can not be opened by pulse, the valve port is seriously bonded or the failure state emergency control loop fails, the control computer (303) alarms to send out the valve port of the breather valve and the failure state emergency control loop for maintenance, and the interval time of periodic pulse control is shortened. For special conditions, when the pressure of the storage tank needs to be changed by human intervention, a control signal can be sent out in a control computer (303) through a human-computer interface (304) to control the emergency control electromagnetic valve (104) at the exhaling end or the emergency control electromagnetic valve (109) at the inhaling end to act, and the exhaling end (113) or the inhaling end (111) is opened, so that the pressure of the storage tank is reduced or increased. A fire retardant element assembly (114) is arranged on the breather valve body (112), and the quick-assembly structure is easy to maintain; the upper cavity and the lower cavity in the breather valve body (112) separated by the fire retardant element (115) are connected by the breather valve pressure difference transmitter (106), the circulation condition of the fire retardant element (115) is monitored, and when the pressure difference value fed back to the control computer (303) by the breather valve pressure difference transmitter (106) is larger than the preset value in the control computer, the alarm order fire retardant element (115) is maintained and cleaned.

The skid-mounted system mainly composed of the storage tank nitrogen-sealed integrated interface (400), the pilot-operated pneumatic breather valve (100) and the suction-end nitrogen pressure reducing valve (307) can bring a common nitrogen-sealed valve (315) and a nitrogen release valve (313) into the system for skid control, and only one interface is connected with the storage tank, namely the lower flange of the storage tank nitrogen-sealed integrated interface (400), as shown in fig. 3. An integrated interface fire retardant element assembly (402) is arranged on the integrated interface valve body (403), and the quick-assembly structure is easy to maintain; the integrated interface pressure difference transmitter (401) is connected with the integrated interface upper cavity (405) and the integrated interface lower cavity (404), the circulation condition of the integrated interface fire-retardant element is monitored, and when the pressure difference value fed back to the control computer (303) by the integrated interface pressure difference transmitter (401) is larger than the preset value in the control computer, the alarm is sent to the single-body interface fire-retardant element assembly (402) for maintenance and cleaning. Inlet nitrogen (308) is decompressed through a nitrogen sealing valve (315) and enters the storage tank (309) through an integrated interface nitrogen inlet passage (406) to be buffered and mixed with gas in the tank; the lower cavity (404) of the integrated interface and the storage tank (309) form an equal-pressure cavity, the nitrogen seal valve (315), the nitrogen release valve (313), the exhalation end pilot valve (105) and the inhalation end pilot valve (110) all take pressure at the position, pressure signals at the position can accurately reflect pressure changes of the storage tank, and the influence of nitrogen inlet of the nitrogen seal valve (315), nitrogen release of the nitrogen release valve (313) and exhalation airflow of the pilot pneumatic breathing valve (100) cannot be influenced, and the influence of inhalation airflow of the pilot pneumatic breathing valve (100) is solved by action of the inhalation end pilot valve (110). The pressure transmitter (101) feeds the pressure of the storage tank (309) back to the control computer (303) for real-time monitoring; the opening and closing conditions of the valve ports of the nitrogen sealing valve (315) and the nitrogen discharging valve (313) are fed back to the control computer (303) by the nitrogen sealing valve position switch (314) and the nitrogen discharging valve position switch (312), when the pressure of the storage tank reaches the nitrogen sealing set pressure or the nitrogen discharging set pressure, the valve port of the nitrogen sealing valve (315) or the nitrogen discharging valve (313) acts, the control computer (303) also receives a corresponding valve position signal fed back by the nitrogen sealing valve position switch (314) or the nitrogen discharging valve position switch (312), and if the valve position signal is not received, the control computer (303) alarms the fault maintenance of the equipment of the nitrogen sealing valve (315), the nitrogen sealing valve position switch (314) or the nitrogen discharging valve (313) and the nitrogen discharging valve position switch (312). Because the fire-retardant element is arranged in the nitrogen-sealed integrated interface (400) of the storage tank, the fire-retardant element (115) is not installed in the fire-retardant element assembly (114) in the pilot-operated pneumatic breather valve (100), and only an external bearing and sealing device is reserved. The set pressure of the suction-end nitrogen reducing valve (307) is lower than the set pressure of the nitrogen discharging valve (313) and higher than the external atmospheric pressure, the storage tank can quickly supplement pressure to a normal working state, and the risk that the pressure loss state is squashed by the atmosphere is reduced. If the pressure guide point is separately arranged on the storage tank, the set pressure of the nitrogen pressure reducing valve (307) at the suction end can be increased, so that the pressure of the storage tank is supplemented more quickly, the risk of atmospheric pressure collapse caused by pressure loss is less, and an interface between a skid-mounted system and the storage tank is increased to take an alternative. The configuration and the function of the pilot-operated pneumatic breather valve (100), the control computer (303) and the human-computer interface (304) in the system are the same as those of the skid-mounted system (figure 1) mainly composed of the pilot-operated pneumatic breather valve (100), the secondary pilot-operated nitrogen-sealed nitrogen-releasing fire-retardant integrated valve (200) and the suction-end nitrogen pressure reducing valve (307).

The use of the pilot operated pneumatic breathing valve (100) in conventional intake air conditions is retained and a double protection function is added, see fig. 4. In the control computer (303), not only the inhalation-side emergency control solenoid valve (109) but also a double exhalation emergency opening pressure are set, and not only the exhalation-side emergency control solenoid valve (104) but also a double inhalation emergency opening pressure are set. If the opening of the conventional control loop of the suction end (111) fails, the pressure of the storage tank continues to drop, and when the feedback pressure of the pressure transmitter (101) touches the suction emergency opening pressure set by the control computer (303), the control computer (303) sends a control signal to the suction emergency control electromagnetic valve (109), the suction emergency control electromagnetic valve (109) acts, and the suction end (111) is forcibly opened to suck air; however, if the pressure of the storage tank is continuously reduced and touches the double-suction emergency opening pressure due to failure of re-opening, the control computer (303) sends a control signal to the emergency control electromagnetic valve (104) at the exhalation end to forcibly open the exhalation end (113) to suck downstream waste gas so as to protect the safety of the storage tank. Similarly, if the conventional control loop of the calling end (113) is in an opening fault, the pressure of the storage tank continues to rise, and when the feedback pressure of the pressure transmitter (101) touches the calling emergency opening pressure set by the control computer (303), the control computer (303) sends a control signal to the calling emergency control electromagnetic valve (104), the calling emergency control electromagnetic valve (104) acts, and the calling end (113) is opened forcefully; however, if the pressure of the storage tank continuously rises and touches the double-exhalation emergency opening pressure due to failure of re-opening, the control computer (303) sends a control signal to the suction end emergency control electromagnetic valve (109) to forcibly open the suction end (111) to discharge the storage tank gas into the atmosphere so as to protect the safety of the storage tank. The application of the pilot-operated pneumatic breather valve (100) in the working condition of air suction is suitable for a skid-mounted system formed by a two-stage pilot-operated nitrogen-sealed nitrogen-releasing fire-retardant integrated valve (200), and is also suitable for a skid-mounted system formed by a storage tank nitrogen-sealed integrated interface (400) matched with a common nitrogen-sealed valve (315) and a nitrogen-releasing valve (313).

The skid-mounted system formed by the two-stage pilot-operated nitrogen-sealing nitrogen-releasing fire-retardant integrated valve (200) has high integration level, simple structure and low cost; the pilot pneumatic breather valve (100) does not generate a flow bottleneck and has high efficiency; the suction-end nitrogen reducing valve (307) can be set to be higher than a set value of the exhalation set pressure to introduce nitrogen with larger flow, so that the back pressure of the storage tank is faster, the risk is smaller, the efficiency is higher, and the cost is reduced due to the selection of the model of the suction-end nitrogen reducing valve (307). The storage tank nitrogen-sealed integrated interface (400) can be effectively applied to a common nitrogen-sealed valve (315) and a nitrogen release valve (313), so that the storage tank operation safety and intelligent management system are more widely applied. The use of a pilot operated pneumatic breathing valve (100) for air intake conditions also provides an option, and is expected to be a transition to nitrogen intake applications. The valve body of the pilot-operated pneumatic breather valve (100) has two types, one is a new valve body shown in figures 1, 2 and 3, namely a breather valve body (112), and a fire retardant element is arranged; the other is a conventional valve body shown in fig. 4, without a fire retardant element, but which may be shared with a conventional breather valve.

Drawings

Fig. 1 shows a nitrogen inhalation type storage tank safety intelligent management system mainly composed of a pilot type pneumatic breather valve (100) and a secondary pilot type nitrogen sealing and releasing fire retardant integrated valve (200).

Fig. 2 is a sectional view of the pilot-operated pneumatic breather valve (100), the two-stage pilot-operated nitrogen-sealed nitrogen-releasing fire-retardant integrated valve (200), and the storage tank nitrogen-sealed integrated interface (400).

Fig. 3 shows a nitrogen inhalation type storage tank safety intelligent management system mainly composed of a pilot type pneumatic breather valve (100), a storage tank nitrogen seal integrated interface (400), and a common nitrogen seal valve (315) and a nitrogen release valve (313).

Fig. 4 shows an air-breathing storage tank safety intelligent management system mainly composed of a pilot pneumatic breather valve (100), a storage tank nitrogen-sealed integrated interface (400), and a common nitrogen-sealed valve (315) and a nitrogen-release valve (313).

The codes in the figure are respectively: 100-pilot type pneumatic breather valve (patent number: ZL201810528703. X); 101-a pressure transmitter; 102-high pressure filtration relief valve; 103-a valve position switch of a breathing-out end; 104-a calling end emergency control electromagnetic valve; 105-a breathe-out end pilot valve; 106-a breathing valve differential pressure transmitter; 107-filter pressure reducing valve; 108-suction side valve position switch; 109-suction side emergency control solenoid valve; 110-suction side pilot valve; 111-suction end; 112-a breather valve body; 113-call-out end; 114-a firestop element assembly; 115-a fire stopping element; 116-a breathe-out end control cylinder; 117-suction side control cylinder; 200-two-stage pilot type nitrogen sealing, releasing and fire retarding integrated valve (patent number: ZL 201921749278.3); 201-nitrogen end-sealing valve position switch; 202-integral valve differential pressure transmitter; 203-nitrogen discharge end valve position switch; 204-an integral valve body; 205-integrated valve upper chamber; 206-one-piece valve lower chamber; 207-an integral valve flame retardant element; 208-integral valve nitrogen inlet passage; 209-nitrogen seal valve end; 210-nitrogen bleed valve end; 211-a secondary pilot valve group; 301-a feedback signal; 302-control signals; 303-control computer; 304-a human-machine interface; 305-nitrogen inlet port pressure transmitter; 306 — a working gas inlet tube; 307-suction side nitrogen relief valve; 308-inlet nitrogen; 309-a storage tank; 310-a pressure guiding pipe; 311-outlet boil-off gas; 312-nitrogen relief valve position switch; 313-nitrogen relief valve; 314-nitrogen seal valve position switch; 315-nitrogen sealing valve; 400-integrated interface of nitrogen-sealed storage tank (patent number: ZL 201711067459.3); 401-integral interface differential pressure transmitter; 402-an integral interface fire stop element assembly; 403-a one-piece interface valve body; 404-one piece interface lower cavity; 405-a unitary interface upper cavity; 406-integral interface nitrogen inlet passage.

Detailed Description

One of the storage tank safe nitrogen-sealed nitrogen-leaking breathing fire-retardant function integration and intelligent management systems shown in the figures 1, 3 and 4 is configured according to user requirements, a suitable pilot-operated pneumatic breather valve (100), a second-stage pilot-operated nitrogen-sealed nitrogen-leaking fire-retardant integrated valve (200) or a storage tank nitrogen-sealed integrated interface (400), a nitrogen-sealed valve (315), a nitrogen-leaking valve (313) and other devices for pressure reduction, sensing, electric control and the like are selected to be prized according to parameters of a user storage tank (309) and pressure of inlet nitrogen (308), and after the installation and debugging of simulated working conditions in a factory are qualified, the system is assembled on a user field storage tank for matching and debugging, and is put into operation after the system is qualified. The system composed of the two-stage pilot type nitrogen sealing, releasing and fire retarding integrated valve (200) is taken as an example for description, and the other types are consistent.

The balance operation state of the storage tank (309) is that the internal pressure is between the nitrogen seal set pressure and the nitrogen discharge set pressure, and when the liquid in the storage tank is pumped out or (and) the external air pressure is increased, the pressure of the storage tank is contacted with the nitrogen seal set pressure, the nitrogen seal valve end is filled with nitrogen for pressure compensation; when the liquid in the storage tank is pumped in or (and) the external air pressure is reduced, the pressure of the storage tank is contacted with the set pressure of the nitrogen release, and the nitrogen release valve end releases the nitrogen and releases the pressure. The pressure transmitter (101) feeds the pressure of the storage tank (309) back to the control computer (303) for real-time monitoring. The opening and closing conditions of the valve ports of the nitrogen sealing valve end (209) and the nitrogen discharging valve end (210) are fed back to the control computer (303) by the nitrogen sealing end valve position switch (201) and the nitrogen discharging end valve position switch (203), when the pressure of the storage tank is in contact with the set pressure of the nitrogen sealing or the set pressure of the nitrogen discharging, the valve port of the nitrogen sealing valve end (209) or the nitrogen discharging valve end (210) acts, the control computer (303) also receives a corresponding valve position signal fed back by the nitrogen sealing end valve position switch (201) or the nitrogen discharging end valve position switch (203), and if the corresponding valve position signal is not received, the control computer (303) alarms the service of the nitrogen sealing valve end (209), the nitrogen sealing end valve position switch (201) or the nitrogen discharging valve end (210) and the nitrogen discharging end valve position switch (203), and performs fault maintenance, and is shown in figure 2.

When the liquid in the storage tank is pumped out or (and) the external air pressure rises violently, the nitrogen inlet pressure of the nitrogen sealing valve end is not enough, or the nitrogen sealing valve end fails to open the nitrogen inlet, so that the pressure of the storage tank continuously drops and touches the suction set pressure, the suction end opens the suction nitrogen or air, the suction end valve position switch (108) feeds back an opening signal to the control computer (303), and the pressure of the storage tank rises along with the opening signal; when the pressure rises to the suction set pressure, the suction end is closed, the storage tank pressure returns to be controlled by the nitrogen sealing valve end (209) and the nitrogen releasing valve end (210), and the suction end valve position switch (108) feeds back a suction end closing signal to the control computer (303). If the suction end is in open failure, the pressure of the storage tank continuously drops, the control computer (303) sends out a system failure yellow early warning signal, when the feedback pressure of the pressure transmitter (101) touches the suction emergency opening pressure set by the control computer (303), the control computer (303) sends out a control signal to the suction emergency control electromagnetic valve (109), the suction emergency control electromagnetic valve (109) acts, the suction conventional control loop is closed, the suction failure state emergency control loop is opened, the high-pressure working gas regulated by the high-pressure filtering and reducing valve (102) enters the lower cavity of the suction control cylinder (117), the suction end (111) is forcibly opened, and the suction valve position switch (108) feeds back the opening signal to the control computer (303). Along with the suction of nitrogen or air, when the pressure of the storage tank is higher than the suction emergency opening pressure, the control computer (303) sends a control signal to the suction end emergency control electromagnetic valve (109), the suction end emergency control electromagnetic valve (109) returns to the original position, the suction end failure state emergency control loop is closed, and the suction end conventional control loop is opened; if the nitrogen or air is continuously and normally sucked at the moment, the opening fault of the suction end (111) is caused by the fact that the valve port cannot be opened due to bonding, the fault is eliminated, the storage tank returns to the normal working state when running, and the yellow early warning signal of the system fault is relieved by the control computer (303). If the suction end (111) is closed at the moment and normal suction can not be continued, the failure of the conventional suction end control circuit is described, the control computer (303) switches the control pressure of the emergency suction end control electromagnetic valve (109) to the suction set pressure, so that the emergency suction end control circuit takes over the conventional suction end control circuit to continue to start to work when the conventional suction end control circuit is in the failure state, the conventional suction end control circuit is closed, and the control computer (303) alarms and dispatches the field emergency maintenance of the conventional suction end control circuit; after the fault of the suction end conventional control loop is eliminated, the control computer (303) removes the yellow early warning signal of the system fault. If the suction end (111) is forcibly opened by high-pressure working gas and the feedback pressure of the pressure transmitter (101) continuously drops, the control computer (303) sends out a system fault orange early warning signal, (for the configuration of sucked air, the pressure of the storage tank continuously drops and touches double-suction emergency opening pressure, the control computer (303) sends out a control signal to the emergency control electromagnetic valve (104) of the exhalation end, the exhalation end (113) is forcibly opened to suck downstream waste gas to protect the safety of the storage tank, if the continuous opening fails, the liquid pumping of the storage tank is stopped at the moment, an emergency relief valve with a suction function or a manhole of the manually opened storage tank is subjected to pressure compensation according to the configuration of safety equipment of the storage tank, the safety accident of the storage tank is avoided, and the control computer (303) alarms that the single suction end (111) is not prepared and a control loop is subjected to on-site; after the suction end (111) equipment and the control loop are cleared of faults, the control computer (303) removes the orange early warning signal of the system fault, and the storage tank system returns to a normal working state.

When the liquid in the storage tank is pumped or (and) the external air pressure is reduced violently, the nitrogen leakage at the nitrogen leakage valve end is not in time, or the nitrogen leakage valve end fails to open the nitrogen leakage, so that the pressure of the storage tank continuously rises to reach the set exhalation pressure, the exhalation end (113) is opened to release the pressure, the valve position switch (103) at the exhalation end feeds back an opening signal to the control computer (303), and the pressure of the storage tank is reduced along with the opening signal; when the pressure is reduced to the set pressure of exhalation, the exhalation end is closed, the storage tank pressure returns to be controlled by the nitrogen sealing valve end (209) and the nitrogen releasing valve end (210), and the exhalation end valve position switch (103) feeds back a closing signal to the control computer (303). If the calling end (113) is in open failure, the pressure of the storage tank continues to rise, the control computer (303) sends out a yellow early warning signal of system failure, when the feedback pressure of the pressure transmitter (101) touches the calling emergency opening pressure set by the control computer (303), the control computer (303) sends out a control signal to the calling emergency control electromagnetic valve (104), the calling emergency control electromagnetic valve (104) acts, the conventional control loop of the calling end is closed, the emergency control loop of the fault state of the calling end is opened, the high-pressure working gas regulated by the high-pressure filtering and reducing valve (102) enters the lower cavity of the calling control cylinder (116), the calling end (113) is opened forcefully to release pressure, and the valve position switch (103) of the calling end feeds back the opening signal to the control computer (303); along with pressure relief, when the pressure of the storage tank is lower than the emergent opening pressure of the calling out, the control computer (303) sends a control signal to the emergent control electromagnetic valve (104) at the calling out end, the emergent control electromagnetic valve (104) at the calling out end is reset, the emergent control loop at the fault state of the calling out end is closed, and the conventional control loop at the calling out end is opened; if normal pressure relief is continued at the moment, the opening fault of the calling end (113) is caused by the fact that the valve port cannot be opened due to bonding, the fault is eliminated, the storage tank returns to a normal working state in operation, and the yellow early warning signal of the system fault is relieved by the control computer (303). If the calling end (113) is closed at the moment and normal pressure relief cannot be continued, the fault of the conventional control circuit of the calling end is indicated, the control computer (303) switches the control pressure of the emergency control electromagnetic valve (104) of the calling end to the calling set pressure, so that the emergency control circuit takes over the conventional control circuit of the calling end to continue to start working in the fault state of the calling end, the conventional control circuit of the calling end is closed, and the control computer (303) alarms and dispatches the field emergency maintenance of the conventional control circuit of the calling end; after the fault of the conventional control loop of the calling end is eliminated, the yellow early warning signal of the system fault is relieved by the control computer (303). If the strong opening of the high-pressure working gas at the exhaling end (113) fails, the feedback pressure of the pressure transmitter (101) continues to rise, the control computer (303) sends out a system fault orange early warning signal, (for the configuration of inhaled air, the pressure of the storage tank continuously rises, and the double-exhalation emergency opening pressure is touched, the control computer (303) sends out a control signal to the inhalation end emergency control electromagnetic valve (104), the inhalation end (111) is strongly opened to discharge the storage tank gas into the atmosphere to protect the safety of the storage tank, if the continuous opening fails, the liquid pumping of the storage tank is stopped at the moment, the emergency relief valve or the manhole of the storage tank is manually opened to release pressure according to the configuration of the safety equipment of the storage tank, the safety accident of the storage tank is avoided, and the control computer (303) alarms, dispatches the equipment at the exhaling end (113); after the fault of the equipment and the control loop at the calling end (113) is eliminated, the orange early warning signal of the system fault is removed by the control computer (303), and the storage tank system returns to a normal working state.

For the working condition that the valve port of the breather valve is easy to be bonded due to media, a regular pulse starting emergency control electromagnetic valve can be arranged in a control computer (303) to ensure that the valve port of the breather valve is opened by regular pulses, so as to avoid bonding; if the valve port of the breather valve can not be opened by pulse, the valve port is seriously bonded or the failure state emergency control loop fails, the control computer (303) alarms to send out the valve port of the breather valve and the failure state emergency control loop for maintenance, and the interval time of periodic pulse control is shortened. For special conditions, when the pressure of the storage tank needs to be changed by human intervention, a control signal can be sent out in a control computer (303) through a human-computer interface (304) to control the emergency control electromagnetic valve (104) at the exhaling end or the emergency control electromagnetic valve (109) at the inhaling end to act, and the exhaling end (113) or the inhaling end (111) is opened, so that the pressure of the storage tank is reduced or increased.

Claims

1. The utility model provides a storage tank safety nitrogen seals nitrogen and lets breathe back a fire relief function integration and intelligent management system which characterized in that: integrating the functions of a nitrogen sealing valve, a nitrogen release valve, a breather valve and a flame arrester in the nitrogen sealing system equipment of the storage tank, and arranging a sensing and electric control device to be prized; the computer control system is used for realizing the functions of monitoring the pressure of the storage tank in real time, monitoring the switches of the nitrogen sealing valve, the nitrogen release valve and the breather valve, monitoring the circulation condition of fire retardant elements, controlling the regular pulse opening of the breather valve, early warning of system faults, emergency control of equipment faults and manual intervention control in a control room; and realize that the breather valve inhales nitrogen gas, improve the quality of liquid medium and the security of storage tank system.

2. The storage tank safe nitrogen-sealed nitrogen-releasing breathing fire-retardant function integration and intelligent management system as claimed in claim 1, is characterized in that: only two interfaces of a skid-mounted system mainly consisting of a pilot-operated pneumatic breather valve (100), a secondary pilot-operated nitrogen-sealed nitrogen-leaking fire-retardant integrated valve (200) and a suction-end nitrogen pressure reducing valve (307) are connected with a storage tank, and the skid-mounted system is respectively provided with a pilot-operated pneumatic breather valve (100) bottom flange and a secondary pilot-operated nitrogen-sealed nitrogen-leaking fire-retardant integrated valve (200) bottom flange; the two-stage pilot type nitrogen sealing and releasing and fire retarding integrated valve (200) controls the opening and closing of the valve ports of a nitrogen sealing valve end (209) and a nitrogen releasing valve end (210) through a two-stage pilot valve group (211), can realize the field regulation of the nitrogen sealing set pressure and the nitrogen releasing set pressure, and is set as a reference value in a control computer (303); an integrated valve fire retardant element (207) is arranged in an integrated valve body (204), an integrated valve pressure difference transmitter (202) is connected with an integrated valve upper cavity (205) and an integrated valve lower cavity (206), the circulation condition of the integrated valve fire retardant element (207) is monitored, and when the pressure difference value fed back to a control computer (303) by the integrated valve pressure difference transmitter (202) is greater than the preset value in the control computer (303), an alarm is displayed that the integrated valve fire retardant element (207) needs to be maintained and cleaned; inlet nitrogen (308) is decompressed through a nitrogen sealing valve end (209) and enters the storage tank (309) through an integrated valve nitrogen inlet passage (208), and is buffered and mixed with gas in the tank; the lower cavity (206) of the integrated valve and the storage tank (309) form an equal-pressure cavity, the pressure of the secondary pilot valve group (211), the pressure of the exhalation-end pilot valve (105) and the pressure of the inhalation-end pilot valve (110) are obtained, and pressure signals can accurately reflect the pressure change of the storage tank and cannot be influenced by the impact of nitrogen inlet and nitrogen discharge of the secondary pilot type nitrogen-sealed nitrogen-discharge fire-retardant integrated valve (200) and the inhalation of exhalation airflow of the pilot type pneumatic respiration valve (100); the pressure transmitter (101) feeds the pressure of the storage tank (309) back to the control computer (303) for real-time monitoring; the opening and closing conditions of the valve ports of the nitrogen sealing valve end (209) and the nitrogen discharging valve end (210) are fed back to the control computer (303) by the nitrogen sealing end valve position switch (201) and the nitrogen discharging end valve position switch (203), when the pressure of the storage tank is in contact with the set pressure of the nitrogen sealing or the set pressure of the nitrogen discharging, the valve port of the nitrogen sealing valve end (209) or the nitrogen discharging valve end (210) acts, the control computer (303) also receives a valve position signal fed back by the nitrogen sealing end valve position switch (201) or the nitrogen discharging end valve position switch (203), and if the valve position signal is not received, the control computer (303) alarms the equipment fault maintenance of the nitrogen sealing valve end (209), the nitrogen sealing end valve position switch (201) or the nitrogen discharging valve end (210) and the nitrogen discharging end valve position switch (203);

the pressure signal air source of the pilot-operated pneumatic breather valve (100) is separated from the opening and closing air source of the breather valve, the air pressure of the storage tank is only used as a pressure signal, the pressure signal is introduced into the exhalation end pilot valve (105) and the inhalation end pilot valve (110) through a pressure guiding pipe (310), and compared with the exhalation set pressure and the inhalation set pressure, the change of the pressure signal determines the action of the pilot valves; the exhalation set pressure and the inhalation set pressure can be adjusted on site and are set as reference values in a control computer (303); two groups of breathing valve opening and closing control loops which are connected in parallel and interlocked are arranged, inlet nitrogen (308) is introduced through a working gas introducing pipe (306) to serve as a breathing valve opening and closing power gas source, one group of the breathing valve opening and closing control loops is subjected to pressure regulation through a filtering and reducing valve (107) and is controlled by a breathing-end pilot valve (105) and a suction-end pilot valve (110) to serve as a conventional control loop; the other group is regulated by a high-pressure filtering pressure reducing valve (102) and is controlled by a calling-end emergency control electromagnetic valve (104) and a suction-end emergency control electromagnetic valve (109) to be used as a fault state emergency control loop; the start-stop control loops of the exhalation end (113) and the inhalation end (111) are mutually independent; the set pressure of the filter pressure reducing valve (107) and the high-pressure filter pressure reducing valve (102) is adjusted along with the pressure of the inlet nitrogen (308), and the pressure of the high-pressure filter pressure reducing valve (102) is set to be about twice of that of the filter pressure reducing valve (107) to form a pressure gradient;

when the pressure of the storage tank rises and reaches the preset pressure of exhalation, the pilot valve (105) at the exhalation end acts, the working gas regulated by the filter pressure-reducing valve (107) enters the lower cavity of the control cylinder (116) at the exhalation end, the exhalation end (113) is opened for pressure relief, and the valve position switch (103) at the exhalation end feeds back an opening signal to the control computer (303); if the pressure of the storage tank is continuously increased due to a starting fault, a control computer (303) sends out a system fault yellow early warning signal, when the feedback pressure of the pressure transmitter (101) touches the emergent calling opening pressure set by the control computer (303), the control computer (303) sends out a control signal to an emergent calling control electromagnetic valve (104), the emergent calling control electromagnetic valve (104) acts, a conventional calling control loop is closed, the emergent calling control loop is opened due to a fault state, high-pressure working gas regulated by a high-pressure filtering and reducing valve (102) enters a lower cavity of a calling control cylinder (116), a calling end (113) is opened forcefully for pressure relief, and a calling valve position switch (103) feeds back the opening signal to the control computer (303); along with pressure relief, when the pressure of the storage tank is lower than the emergent opening pressure of the calling out, the control computer (303) sends a control signal to the emergent control electromagnetic valve (104) at the calling out end, the emergent control electromagnetic valve (104) at the calling out end is reset, the emergent control loop at the fault state of the calling out end is closed, and the conventional control loop at the calling out end is opened; if normal pressure relief is continued at the moment, the opening fault of the calling end (113) is caused by the fact that the valve port cannot be opened due to bonding, the fault is eliminated, the storage tank returns to a normal working state in operation, and the control computer (303) removes a yellow early warning signal of the system fault; if the calling end (113) is closed at the moment and normal pressure relief cannot be continued, the fault of the conventional control circuit of the calling end is indicated, the control computer (303) switches the control pressure of the emergency control electromagnetic valve (104) of the calling end to the calling set pressure, so that the emergency control circuit takes over the conventional control circuit of the calling end to continue to start working in the fault state of the calling end, the conventional control circuit of the calling end is closed, and the control computer (303) alarms and dispatches the field emergency maintenance of the conventional control circuit of the calling end; after the fault of the conventional control loop of the calling end is eliminated, the yellow early warning signal of the system fault is relieved by the control computer (303); if the strong opening of the calling end (113) by the high-pressure working gas fails, the feedback pressure of the pressure transmitter (101) continues to rise, the control computer (303) sends an orange early warning signal of system fault, the liquid pumping of the storage tank is stopped at the moment, the emergency relief valve is concerned or the manhole of the storage tank is manually opened to relieve pressure according to the configuration of the safety equipment of the storage tank, the safety accident of the storage tank is avoided, and the control computer (303) alarms, dispatches the calling end (113) equipment and controls the field emergency maintenance of a loop; after the fault of the equipment and the control loop at the calling end (113) is eliminated, the orange early warning signal of the system fault is removed by the control computer (303), and the storage tank system returns to a normal working state;

when the pressure of the storage tank is reduced and reaches the suction set pressure, the suction end pilot valve (110) acts, the working gas regulated by the filtering and reducing valve (107) enters the lower cavity of the suction end control cylinder (117), the suction end (111) is opened to suck nitrogen, and the suction end valve position switch (108) feeds back an opening signal to the control computer (303); if the pressure of the storage tank is continuously reduced due to opening failure, a control computer (303) sends out a system failure yellow early warning signal, when the feedback pressure of the pressure transmitter (101) touches the suction emergency opening pressure set by the control computer (303), the control computer (303) sends out a control signal to a suction end emergency control electromagnetic valve (109), the suction end emergency control electromagnetic valve (109) acts, a suction end conventional control loop is closed, a suction end failure state emergency control loop is opened, high-pressure working gas regulated by a high-pressure filtering and reducing valve (102) enters a lower cavity of a suction end control cylinder (117), a suction end (111) is forcibly opened, and a suction end valve position switch (108) feeds back the opening signal to the control computer (303); because the pressure signal of the storage tank is obtained from the lower cavity (206) of the integrated valve, the nitrogen pressure reducing valve (307) at the suction end can be used for sucking nitrogen which is higher than the set exhalation pressure into the storage tank without impacting the pressure signal, so that the storage tank can quickly supplement the pressure to a normal working state, and the risk that the pressure loss state is squashed by atmosphere is reduced; along with the suction of nitrogen, when the pressure of the storage tank is higher than the suction emergency opening pressure, the control computer (303) sends a control signal to the suction end emergency control electromagnetic valve (109), the suction end emergency control electromagnetic valve (109) returns to the original position, the suction end failure state emergency control loop is closed, and the suction end conventional control loop is opened; if the nitrogen continues to be sucked normally at the moment, the opening fault of the suction end (111) is caused by the fact that the valve port cannot be opened due to bonding, the fault is eliminated, the storage tank returns to the normal working state when running, and the yellow early warning signal of the system fault is relieved by the control computer (303); if the suction end (111) is closed at the moment and normal suction can not be continued, the failure of the conventional suction end control circuit is described, the control computer (303) switches the control pressure of the emergency suction end control electromagnetic valve (109) to the suction set pressure, so that the emergency suction end control circuit takes over the conventional suction end control circuit to continue to start to work when the conventional suction end control circuit is in the failure state, the conventional suction end control circuit is closed, and the control computer (303) alarms and dispatches the field emergency maintenance of the conventional suction end control circuit; after the fault of the suction end conventional control loop is eliminated, the control computer (303) removes the yellow early warning signal of the system fault; if the suction end (111) is not opened by high pressure working gas with strong force and the feedback pressure of the pressure transmitter (101) continues to drop, the control computer (303) sends out a system fault orange early warning signal, at the moment, the liquid in the storage tank is stopped being pumped out, an emergency relief valve with a suction function or a manhole of the storage tank is manually opened for pressure compensation according to the configuration of safety equipment of the storage tank, the safety accident of the storage tank is avoided, and the control computer (303) alarms, dispatches the suction end (111) equipment and controls the field emergency maintenance of a loop; after the suction end (111) equipment and the control loop are cleared of faults, the control computer (303) removes the orange early warning signal of the system fault, and the storage tank system returns to a normal working state;

a regular pulse starting emergency control electromagnetic valve is arranged in the control computer (303), so that a valve port of the breather valve is opened by regular pulse, and bonding is avoided; if the valve port of the breather valve can not be opened by pulse, the valve port is seriously bonded or the failure state emergency control loop fails, the control computer (303) alarms to send the valve port of the breather valve and the failure state emergency control loop to repair and maintain, and the interval time of regular pulse control is shortened; for special conditions, when the pressure of the storage tank needs to be changed by human intervention, a control signal can be sent out in a control computer (303) through a human-computer interface (304) to control the emergency control electromagnetic valve (104) at the exhaling end or the emergency control electromagnetic valve (109) at the inhaling end to act, and the exhaling end (113) or the inhaling end (111) is opened to reduce the pressure or increase the pressure of the storage tank; a fire retardant element assembly (114) is arranged on the breather valve body (112), and the quick-assembly structure is easy to maintain; the upper cavity and the lower cavity in the breather valve body (112) separated by the fire retardant element (115) are connected by the breather valve pressure difference transmitter (106), the circulation condition of the fire retardant element (115) is monitored, and when the pressure difference value fed back to the control computer (303) by the breather valve pressure difference transmitter (106) is larger than the preset value in the control computer, the alarm order fire retardant element (115) is maintained and cleaned.

3. The storage tank safe nitrogen-sealed nitrogen-releasing breathing fire-retardant function integration and intelligent management system as claimed in claim 1, is characterized in that: the skid-mounted system mainly composed of the storage tank nitrogen-sealed integrated interface (400), the pilot-operated pneumatic breather valve (100) and the suction-end nitrogen pressure reducing valve (307) can bring the common nitrogen-sealed valve (315) and the nitrogen release valve (313) into the system for skid control, and only one interface is connected with the storage tank, namely the lower flange of the storage tank nitrogen-sealed integrated interface (400); an integrated interface fire retardant element assembly (402) is arranged on the integrated interface valve body (403), and the quick-assembly structure is easy to maintain; the integrated interface pressure difference transmitter (401) is connected with the integrated interface upper cavity (405) and the integrated interface lower cavity (404), the circulation condition of the integrated interface fire retardant element is monitored, and when the pressure difference value fed back to the control computer (303) by the integrated interface pressure difference transmitter (401) is larger than the preset value in the control computer, the alarm is sent to the single-body interface fire retardant element assembly (402) for maintenance and cleaning; inlet nitrogen (308) is decompressed through a nitrogen sealing valve (315) and enters the storage tank (309) through an integrated interface nitrogen inlet passage (406) to be buffered and mixed with gas in the tank; the integrated interface lower cavity (404) and the storage tank (309) form an equal-pressure cavity, the nitrogen seal valve (315), the nitrogen release valve (313), the exhalation end pilot valve (105) and the inhalation end pilot valve (110) are all used for taking pressure, and pressure signals can accurately reflect pressure change of the storage tank, cannot be influenced by impact of nitrogen inlet of the nitrogen seal valve (315), nitrogen release of the nitrogen release valve (313) and exhalation airflow of the pilot type pneumatic respiration valve (100), and are influenced by inhalation airflow of the pilot type pneumatic respiration valve (100) and are solved by action of the inhalation end pilot valve (110); the pressure transmitter (101) feeds the pressure of the storage tank (309) back to the control computer (303) for real-time monitoring; the opening and closing conditions of the valve ports of the nitrogen sealing valve (315) and the nitrogen discharging valve (313) are fed back to the control computer (303) by the nitrogen sealing valve position switch (314) and the nitrogen discharging valve position switch (312), when the pressure of the storage tank is in contact with the nitrogen sealing set pressure or the nitrogen discharging set pressure, the valve port of the nitrogen sealing valve (315) or the nitrogen discharging valve (313) acts, the control computer (303) also receives a corresponding valve position signal fed back by the nitrogen sealing valve position switch (314) or the nitrogen discharging valve position switch (312), and if the valve position signal is not received, the control computer (303) alarms the fault maintenance of the equipment of the nitrogen sealing valve (315), the nitrogen sealing valve position switch (314) or the nitrogen discharging valve (313) and the nitrogen discharging valve position switch (312); because the fire-retardant element is arranged in the nitrogen-sealed integrated interface (400) of the storage tank, the fire-retardant element (115) is not arranged in the fire-retardant element assembly (114) in the pilot-operated pneumatic breather valve (100), and only an external bearing and sealing device is reserved; the set pressure of the suction-end nitrogen reducing valve (307) is lower than the set pressure of the nitrogen discharging valve (313) and higher than the external atmospheric pressure, the storage tank can quickly supplement pressure to a normal working state, and the risk that the pressure loss state is squashed by the atmosphere is reduced.

4. The storage tank safe nitrogen-sealed nitrogen-releasing breathing fire-retardant function integration and intelligent management system as claimed in claim 1, is characterized in that: the application of the pilot-operated pneumatic breather valve (100) in the traditional air suction working condition is reserved, and a protection function is added; in the control computer (303), not only the suction emergency opening pressure is set for the suction emergency control electromagnetic valve (109), but also the double-exhalation emergency opening pressure is set, and not only the exhalation emergency opening pressure is set for the exhalation emergency control electromagnetic valve (104), but also the double-inhalation emergency opening pressure is set; if the opening of the conventional control loop of the suction end (111) fails, the pressure of the storage tank continues to drop, and when the feedback pressure of the pressure transmitter (101) touches the suction emergency opening pressure set by the control computer (303), the control computer (303) sends a control signal to the suction emergency control electromagnetic valve (109), the suction emergency control electromagnetic valve (109) acts, and the suction end (111) is forcibly opened to suck air; if the pressure of the storage tank is continuously reduced and touches double-suction emergency opening pressure when the storage tank fails to be opened again, the control computer (303) sends a control signal to the emergency control electromagnetic valve (104) at the exhalation end, and forcibly opens the exhalation end (113) to suck downstream waste gas so as to protect the safety of the storage tank; similarly, if the conventional control loop of the calling end (113) is in an opening fault, the pressure of the storage tank continues to rise, and when the feedback pressure of the pressure transmitter (101) touches the calling emergency opening pressure set by the control computer (303), the control computer (303) sends a control signal to the calling emergency control electromagnetic valve (104), the calling emergency control electromagnetic valve (104) acts, and the calling end (113) is opened forcefully; however, if the pressure of the storage tank continuously rises and touches the double-exhalation emergency opening pressure due to failure of re-opening, the control computer (303) sends a control signal to the suction end emergency control electromagnetic valve (109) to forcibly open the suction end (111) to discharge the storage tank gas into the atmosphere so as to protect the safety of the storage tank.