CN219608093U - Gas tank SIS system - Google Patents

Abstract

The utility model provides a gas tank SIS system, wherein the output end of a detection module is connected with the input end of an input module; the output end of the input module is connected with the input end of the control module; the output end of the control module is connected with the input end of the output module; the output end of the output module is connected with the control end of the execution unit; the detection module detects various parameter signals of the gas cabinet and transmits the various parameter signals to the control module through the input module; the control module processes the parameter signals according to the parameter signals to obtain a control instruction, and transmits the control instruction to the execution unit through the output module; the execution unit executes the closing/opening valve and the alarm action according to the control instruction; therefore, the linkage of the detection module and the execution unit is realized, namely, the safety state of the gas holder is monitored by the detection module, the inlet valve of the gas holder is closed or the operation of the gas holder is stopped in time, the safe and effective operation of the gas holder is ensured, the risk of personnel and equipment in related areas is reduced, and the safety of the gas holder is improved.

Description

Gas tank SIS system

Technical Field

The utility model belongs to the technical field of detection control, and particularly relates to a gas tank SIS system.

Background

The gas tank is used as a steel container for storing industrial and civil gas, is particularly commonly applied in metallurgical and chemical industries, and the safety and potential risk of the gas as dangerous and flammable and explosive chemicals are not ignored. The tank areas matched with the existing chemical engineering projects are mostly operated and controlled and interlocked by adopting a Distributed Control System (DCS). The DCS system has the characteristics of perfect and various control functions, easy operation, easy expansion, convenient maintenance and the like, but is not suitable for safety control. For the tank areas of chemical engineering projects, the operation is more frequent than that of a common oil depot, and the probability of misoperation is higher. In this case, a Safety Instrumented System (SIS) with higher safety is necessary. Thus, the national security production administration issues order 40, requiring "primary or secondary significant sources of hazard involving toxic gases, liquefied gases, highly toxic liquids, equipped with independent Safety Instrumented Systems (SIS)".

At present, a gas tank state monitoring system aiming at monitoring the safety state of a gas tank exists, and the system belongs to a basic gas tank safety monitoring system, mainly comprising monitoring of the gas tank position, the tank capacity, the tank speed, the inclination, the drift and the torsion, wherein the system is relatively independent, but is only used for monitoring, providing the real-time state of the gas tank, providing the real-time alarm, requiring the special observation of operators and adopting manual reaction to cope with dangerous changes during the alarm.

Disclosure of Invention

Therefore, the utility model aims to provide a gas holder SIS system which is used for monitoring the safety state of a gas holder by a detection module, closing the inlet valve of the gas holder or stopping the operation of the gas holder in time, and ensuring the safe and effective operation of the gas holder.

The utility model discloses a gas tank SIS system, which comprises: the device comprises a detection module, an input module, a control module, an output module and an execution unit;

the output end of the detection module is connected with the input end of the input module;

the output end of the input module is connected with the input end of the control module;

the output end of the control module is connected with the input end of the output module;

the output end of the output module is connected with the control end of the execution unit;

the detection module detects various parameter signals of the gas cabinet and transmits the various parameter signals to the control module through the input module; the control module processes the parameter signals according to the parameter signals to obtain a control instruction, and the control instruction is transmitted to the execution unit through the output module; the execution unit executes the valve closing/opening action according to the control instruction.

Optionally, in the gas tank SIS system, the method further includes: an upper computer system;

the upper computer system is connected with the control module and used for acquiring data corresponding to each parameter signal of the gas tank, the state of the execution unit and the alarm state;

the upper computer comprises historical data, alarm data and recording and inquiring functions of system faults.

Optionally, in the gas holder SIS system, the detection module adopts at least one detection mode of differential pressure type, laser range finder and guided wave radar.

Optionally, in the gas holder SIS system, the detection module includes: the device comprises a cabinet level meter, a piston torsion detector, a piston drift detector, a piston inclination detector and an inlet oxygen content monitor;

the cabinet level meter is used for detecting a cabinet level signal of the gas cabinet;

the piston torsion detector is used for detecting torsion signals of the piston of the gas tank;

the piston drift detector is used for detecting a drift signal of the gas tank piston;

the piston inclination detector is used for detecting an inclination signal of the gas tank piston;

the inlet oxygen content monitor is used for detecting an inlet oxygen content signal of the gas tank.

Optionally, in the gas tank SIS system, the tank level gauge includes a high-precision laser sensor;

the cabinet level plan is divided into a light source part and a measured reflector part; the light source part is arranged on the top of the gas cabinet, and the measured reflector part is arranged on the reflecting plate of the gas cabinet.

Optionally, in the gas holder SIS system, the piston torsion detector is installed in the center of the top of the piston of the gas holder by using a high-precision triaxial gyroscope angular sensor as a sensor.

Optionally, in the gas holder SIS system, the piston drift detector is a group of 4 active laser rangefinders, and are uniformly distributed and installed on the same horizontal plane on the outer platform of the piston of the gas holder; the piston drift detector moves along with the piston drift, faces the cabinet wall of the gas cabinet and measures the gap between the outer wall of the piston and the cabinet wall of the gas cabinet.

Optionally, in the gas tank SIS system, the piston inclination detector adopts a group of 4 measuring cylinders;

the measuring cylinder is cylindrical, is filled with nonvolatile liquid, and is uniformly distributed and installed on the same horizontal plane on the outer platform of the piston.

Optionally, in the gas tank SIS system, the two measuring cylinders are perpendicular to each other in pairs to form 2 pairs.

Optionally, in the gas tank SIS system, the control module includes two sub-modules;

any one of the sub-modules independently realizes the function of the control module; so that when the working equipment of the currently working submodule is powered off or fails, the redundant submodule is automatically switched to work.

According to the technical scheme, the output end of the detection module is connected with the input end of the input module; the output end of the input module is connected with the input end of the control module; the output end of the control module is connected with the input end of the output module; the output end of the output module is connected with the control end of the execution unit; the detection module detects various parameter signals of the gas cabinet and transmits the various parameter signals to the control module through the input module; the control module processes the parameter signals to obtain control instructions, and transmits the execution control instructions to the execution unit through the output module; the execution unit executes the closing/opening valve and the alarm action according to the control instruction; therefore, the linkage of the detection module and the execution unit is realized, namely, the safety state of the gas holder is monitored by the detection module, the inlet valve of the gas holder is closed or the operation of the gas holder is stopped in time, the safe and effective operation of the gas holder is ensured, the risk of personnel and equipment in related areas is reduced, and the safety of the gas holder is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a gas holder SIS system provided by an embodiment of the present utility model;

FIG. 2 is a schematic diagram of another gas holder SIS system provided in an embodiment of the present utility model;

FIG. 3 is a schematic diagram of an application scenario of another gas holder SIS system provided by an embodiment of the present utility model;

FIG. 4 is a schematic diagram of another gas holder SIS system provided by an embodiment of the present utility model;

FIG. 5 is a control flow diagram of a gas holder SIS system provided by an embodiment of the utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Term interpretation:

SIS: safety instrumented systems, safety Instrumented System, SIS for short. The method mainly comprises the steps of alarming and interlocking parts in a factory control system, carrying out alarming action or regulation or shutdown control on the monitored result in the system, taking emergency measures on possible dangers of production devices or equipment, and timely responding to the continuously deteriorated state to enable the production devices or equipment to enter a predefined safety interlocking or stopping state so as to prevent the occurrence of dangers and the spread of accidents, thereby minimizing the dangers and losses and ensuring the safety of production equipment, environment and personnel.

Gas cabinet: the gas tank is a steel container for storing industrial and civil gas, and comprises a wet gas tank and a dry gas tank. The wet gas tank is of a sleeve type cylindrical structure sealed by water; the dry gas tank is a piston structure sealed with thin (dry) oil or flexible membrane.

The embodiment of the utility model provides a gas tank SIS system, which is used for solving the problems that in the prior art, the system is only used for monitoring, providing the real-time state of a gas tank and providing real-time alarm, operators are required to observe specially, and manual reaction is adopted to deal with dangerous changes during the alarm.

Referring to fig. 1, the gas cell SIS system comprises: the device comprises a detection module, an input module, a control module, an output module and an execution unit.

The output end of the detection module is connected with the input end of the input module.

That is, the detection module transmits the detected parameter signal to the input of the input module via the output of the detection module.

In practical application, the detection module adopts at least one detection mode of differential pressure type, laser range finder and guided wave radar.

It should be noted that, the measurement mode of the piston inclination can be directly measured by adopting a differential pressure type or a laser range finder or a guided wave radar mode, and is not limited by the patent, and is characterized by having a height difference signal output, so that the measurement mode is not repeated here, and the measurement mode is only required according to actual conditions and is within the protection scope of the utility model.

The output end of the input module is connected with the input end of the control module.

That is, the input module transmits the received parameter signal to the input of the control module via the output of the input module.

The input module may be understood as an IO module of the PLC, but in the safety instrumented system, the input module is mostly distributed and is typically connected to the PLC through a network.

The output end of the control module is connected with the input end of the output module.

That is, the control module processes the received parameter signal to obtain a control command, and then outputs the control command to the input end of the output module through the output end of the control module.

The processing process may be that each parameter signal exceeds a corresponding preset value, and the control instruction indicates closing of a valve, alarming, and the like, and of course, other modes are also possible, which are not described in detail herein, and are all within the protection scope of the present utility model.

It should be noted that, the control module obtains the detection data (i.e. each parameter signal), further processes and computes to obtain some non-direct detection data, and sends a control instruction to the output module when the detection data meets the alarm condition.

It should be noted that these non-direct detection data include: the inclined height and azimuth angle of the piston, the running speed, the cabinet position and the cabinet capacity are obtained through the mathematical operation of the PLC and related instructions.

Calculating the maximum height and the direction angle of the inclination of the piston:

in normal use, 2 pairs of vertical height differences can be obtained through the piston inclination measuring instrument, the height difference between the measuring points of the east measuring cylinder and the west measuring cylinder is set as delta h1, the height difference between the measuring points of the south measuring cylinder and the north measuring cylinder is set as delta h2, and then the method comprises the following steps:

△h1＝|h1-h3|；

△h2＝|h2-h4|；

the maximum height of the inclination is set as Deltah, and the maximum height of the inclination can be calculated by the following steps:

setting the acute angle included angle between the inclined maximum height point and the mounting point of the highest measuring cylinder as alpha, and then:

when Deltah 1<Δh2, time

When Deltah1 is not less than Deltah 2

Calculating the cabinet position and the cabinet capacity:

the cabinet position operation is calculated according to the highest point calculated by the cabinet position and the data collected by the cabinet position, and the relation is as follows: the highest calculated point of the cabinet position is 0, which is the empty height distance from the reference surface measured by the sensor to the top of the piston, namely the value of H1 in the lower graph, and the measured empty height is the value directly output by the laser sensor.

The cabinet capacity is calculated by taking a 2-section type gas cabinet as a model, please refer to a gas cabinet structure diagram, and for convenience of description, the cabinet position is set to be H, and the cabinet capacity is set to be W.

When the cabinet H < = h2, W = pi x R2 x H;

when the cabinet H > H2, w=pi×r2×r2×h2+pi×r1×r1×h;

calculating the cabinet speed:

the cabinet speed is calculated according to the relation between the cabinet position and time which are changed in real time. By instructions of the controller. Firstly, a one-dimensional array storing 30 variables is established, the type is a floating point type, as a digital stack, cabinet positions are stored in the stack according to the frequency of once per second, the first data of the numbers and the current cabinet position are subjected to difference operation according to the first-in first-out mode, the moving displacement of the cabinet in the cabinet position 30s can be obtained, and the speed of the cabinet in units of minutes can be obtained by multiplying 2. This approach allows 30S delay in the bin speed calculation, but the calculation is stable and no additional speed sensor has to be added. The specific instructions are related to the controller used.

The output end of the output module is connected with the control end of the execution unit.

That is, the output module outputs the control instruction to the execution unit through its own output terminal.

The execution unit mainly refers to an inlet valve of the gas tank and is used for closing the inlet valve of the gas tank so as to enable the gas tank to be in a safe state.

The execution unit also comprises a valve controller, and the valve controller executes the action of closing or opening the valve according to the switch command in the control command.

The alarm action can be alarm in modes of whistling, lamplight flashing and the like, and the alarm action is not repeated here, and can be determined according to actual conditions and is within the protection scope of the utility model.

The valve is an inlet valve of the gas cabinet, that is, the gas outlet condition of the gas cabinet can be controlled by closing the valve.

The gas tank is used as a gas storage device, the gas tank can be in an installation state only when no gas is introduced, and the gas tank is opened for ensuring the safety of the gas tank for the outlet valve, so that the stored gas is diffused. A gas cell SIS system typically closes the inlet valve of the gas cell.

The detection module detects various parameter signals of the gas cabinet and transmits the various parameter signals to the control module through the input module; the control module processes the parameter signals according to the parameter signals to obtain a control instruction, and transmits the control instruction to the execution unit through the output module; the execution unit executes the valve closing/opening action according to the control instruction.

That is, the detection module detects various parameter signals of the gas tank, and then transmits the various parameter signals to the input module. The input module transmits each parameter signal to the control module, the control module processes each parameter signal to obtain a control instruction, the control instruction is transmitted to the output module, the output module transmits the control instruction to the execution unit, and the execution unit executes corresponding actions.

In this embodiment, the output end of the detection module is connected with the input end of the input module; the output end of the input module is connected with the input end of the control module; the output end of the control module is connected with the input end of the output module; the output end of the output module is connected with the control end of the execution unit; the detection module detects various parameter signals of the gas cabinet and transmits the various parameter signals to the control module through the input module; the control module processes the parameter signals according to the parameter signals to obtain a control instruction, and transmits the control instruction to the execution unit through the output module; the execution unit executes the closing/opening valve and the alarm action according to the control instruction; therefore, the linkage of the detection module and the execution unit is realized, namely, the safety state of the gas holder is monitored by the detection module, the inlet valve of the gas holder is closed or the operation of the gas holder is stopped in time, the safe and effective operation of the gas holder is ensured, the risk of personnel and equipment in related areas is reduced, and the safety of the gas holder is improved.

It should be noted that the present embodiment may further include: the necessary auxiliary control system for manual intervention.

Such as emergency stop buttons, bypass service buttons, and audible and visual warning lights.

The content of the specific auxiliary control system is not repeated here, and the content is required to be within the protection scope of the utility model according to actual conditions.

It should be noted that another gas tank and a DCS system equipped with the peripheral production system thereof are also provided in the prior art, the system itself comprises parameters such as tank position, tank capacity, etc., and the sensor for corresponding inclination, drift, torsion can be added during the later reconstruction to form a compatible gas tank state monitoring system. The system has complex functions and various operations, and meanwhile, the workload of operators is large, so that the safety monitoring function cannot be truly realized.

In this embodiment, the detection module monitors the safety state of the gas tank, and timely closes the gas tank inlet valve or stops the gas tank, so as to ensure safe and effective operation of the gas tank, reduce the risk of personnel and equipment in related areas, reduce the manual participation amount, and play a role in safety detection.

In practical application, as shown in fig. 2, the gas tank SIS system further includes: and the upper computer system.

The upper computer system is connected with the control module to acquire data corresponding to each parameter signal of the gas cabinet, the state of the execution unit and the alarm state.

The upper computer comprises historical data, alarm data and recording and inquiring functions of system faults.

That is, the host computer system can be used as a personal computer interaction system to provide the functions of inquiring, displaying and the like for the user.

Such as the host computer system displaying the various parameter signals, as well as the status of the execution unit and alarm status.

The state of the execution unit is the valve state of the gas tank.

That is, the host computer system is used for displaying, recording historical data, alarming, operating and the like.

Specifically, the upper computer system is connected with the control module to acquire the data of the gas tank state monitoring in the control module, the related output mechanism and the alarm state, so as to intuitively judge the current state of the gas tank. Meanwhile, the upper computer system comprises recording and inquiring functions of historical data, alarm data, system faults and the like.

Details of the technical implementation of the present solution will be described below. The technical scheme is typically applied to the piston type structure gas tank sealed by the two-section flexible membrane. The typical structure is shown in fig. 3 as follows:

fig. 3 shows a half of the longitudinal section of the gas chamber, wherein the peripheral sealing membrane, the inner sealing membrane and the piston are of a sealed integrated structure, and the sealing membrane rises along with the rising of the piston until the highest running position of the piston is reached. In the figure, R1 is the radius of the inner peripheral sealing film, R2 is the radius of the outer peripheral sealing film, H1 is the empty height measured by the cabinet position meter when the piston is at the lowest position, H2 is the height of the two stages of platforms, and the parameters are used for calculating the cabinet capacity of the piston.

The integral structure means that all parts are connected into a whole through a sealing film to realize sealing. The sealing film is flexible and can be unfolded or folded along with the lifting of the piston, but is always connected with the bottom plate and the piston.

Firstly, installing a detection module at a corresponding position of a gas tank.

In practical application, the detection module includes: the device comprises a cabinet level meter, a piston torsion detector, a piston drift detector, a piston inclination detector and an inlet oxygen content monitor.

The cabinet level meter is used for detecting a cabinet level signal of the gas cabinet.

In practice, the level gauge includes a high precision laser sensor.

The cabinet level meter is divided into a light source part and a measured reflector part. Wherein, the light source part is installed at the cabinet top of the gas cabinet, and the measured reflector part is installed at the reflecting plate of the gas cabinet.

Specifically, the cabinet position meter adopts a high-precision laser sensor to measure, the whole measurement is divided into a light source part and a measured reflector part, wherein the light source part (a laser range finder shown in fig. 3) is arranged on the top of the cabinet, the measured reflector (an air bag top platform) is provided with a reflecting plate to receive the light source and reflect the light source, and then the laser sensor receives the measured reflecting light source and calculates the empty height distance from the top of the cabinet to the top of the air bag and outputs the empty height distance. After the system receives the empty height distance output by the laser sensor, the current height of the air bag is calculated according to the pre-input gas holder related parameter H1, the ascending and descending speed of the air bag is further calculated, and the current holder capacity is further calculated according to the actual sizes of H2, R1 and R2 in FIG. 3.

The piston torsion detector is used for detecting torsion signals of the piston of the gas tank.

In practical application, the piston torsion measuring instrument adopts a high-precision triaxial gyroscope angular instrument as a sensor and is arranged in the center of the top of the piston of the gas tank.

Specifically, the piston torsion measuring instrument adopts a high-precision triaxial gyroscope angular instrument as a sensor, is arranged in the center of the top of the piston, and drives the piston to move and rotate when the piston moves, so that the torsion state of the piston is output.

The piston drift detector is used for detecting a drift signal of the piston of the gas tank.

In practical application, the piston drift detector adopts a group of 4 movable laser rangefinders which are uniformly distributed and installed on the same horizontal plane on the outer platform of the piston of the gas tank; the piston drift detector moves along with the piston drift, faces the wall of the gas tank and measures the gap between the outer wall of the piston and the wall of the gas tank.

Specifically, the piston drift detector is obtained by adopting a group of 4 living laser distance measuring instruments, the piston drift detector is uniformly distributed and installed on the same horizontal plane on an outer platform of the piston, the general installation direction is east, west, south and north, the piston drift detector can move along with the piston drift, and the piston drift detector is opposite to the wall of the gas holder and measures the gap between the outer wall of the piston and the wall of the gas holder.

The piston inclination detector is used for detecting inclination signals of the piston of the gas tank.

In practical application, the piston inclination detector adopts a group of 4 measuring cylinders.

The measuring cylinder is cylindrical, is filled with nonvolatile liquid, and is uniformly distributed and installed on the same horizontal plane on the outer platform of the piston.

In practical application, the two measuring cylinders are perpendicular to each other in a line form 2 pairs.

Specifically, the piston inclination detector is obtained by adopting a group of 4 measuring cylinders, the measuring cylinders are cylindrical, nonvolatile liquid is filled in the measuring cylinders, the same horizontal plane on an outer platform of the piston is uniformly distributed and installed, the general installation directions are east, west, south and north, the two lines of the 4 measuring cylinders are mutually perpendicular to form 2 pairs, the specific measurement can be in 2 modes, firstly, a pressure sampling head is installed at the bottom of each pair of measuring cylinders to a positive pressure chamber and a negative pressure chamber of a differential pressure transmitter, the differential pressure of two poles relative to the measuring cylinders is measured according to the pressure sampling head, the height difference of the liquid in the measuring cylinders is further obtained, and the height difference is the inclination height of the corresponding direction of the piston. And secondly, installing a short-distance laser range finder or a guided wave radar at the top of the measuring cylinder to directly measure the height of the liquid surface so as to obtain the height difference in the measuring cylinder. The height difference signal can be calculated in the control module and converted into the maximum height of the inclination of the piston and the corresponding orientation.

And the inlet oxygen content monitor is used for detecting an inlet oxygen content signal of the gas tank.

Specifically, the output end of the cabinet level meter, the output end of the piston torsion detector, the output end of the piston drift detector, the output end of the piston inclination detector and the output end of the inlet oxygen content monitor are respectively connected with the input module and are used for acquiring detection data in real time.

That is, the detection module includes a series of independent sensors, each of which outputs a respective detection signal, and each of which needs to be connected to the input module to enable the controller to acquire the corresponding detection signal.

It should be noted that, in combination with the two gas tank systems provided in the prior art, there are the following problems:

the basic gas tank state monitoring system is only used for monitoring or providing data output and does not have a control function. The basic gas tank state monitoring system and the alarm output are provided, operators are required to watch, and timely and effective cutting measures cannot be taken when dangerous alarms occur, so that the operation of the gas tank and the safety of related instruments and personnel are ensured. The input signal type of the basic gas holder state detection system is fixed, monitoring of other dangerous source signals such as the oxygen content of inlet gas is not included, and when the gas with the too high oxygen content enters the gas holder, the dangerous coefficient of gas holder combustion and explosion can be correspondingly increased. The gas tank state monitoring function that the DCS system contained is not exclusive enough, can not be independently controlled, can not really play a role in safety monitoring, and needs to increase the work of operators, and delay and danger coefficient increase caused by factors are increased.

In this embodiment, the data output can be monitored or provided, and the control function is provided. The gas tank state monitoring system and the alarm output are provided, operators are not required to watch, and timely and effective cutting measures are adopted when dangerous alarms occur, so that the operation of the gas tank and the safety of related instruments and personnel are ensured. The input signal type of the gas holder state detection system is fixed, and the input signal type comprises monitoring of other dangerous source signals, such as the oxygen content of inlet gas, and the like, so that the dangerous coefficient of gas holder combustion and explosion is reduced. The gas tank state monitoring function is specific, can be controlled independently, really plays a role in safety monitoring, does not need to increase the work of operators, avoids the delay caused by artificial factors, and reduces the danger coefficient.

It should be noted that, in this embodiment, the 1756-L73 processor of the AB company and the input/output module matched with the same are adopted, the system includes a hardware redundancy function, the main equipment is shown as the following standard, the equipment model used in this case does not represent the equipment model necessary in this patent, and the processor and the input/output module with similar functions of other manufacturers can be used for replacing.

Table 1: specific model of module

As shown in table 1, to enhance the reliability of the system, the control module includes a redundancy function, and 2 sets of controllers implement hot standby, and can implement automatic switching when power failure, and the like of the working equipment occur. The rack, the power module and the Ethernet communication module in the upper table are auxiliary supporting equipment.

The redundancy function is an inherent function possessed by the PLC, and hot standby can be realized by arranging 2 sets of equipment and redundancy modules and correspondingly setting the equipment and the redundancy modules on programming software.

The system comprises a 4-slot rack, wherein a power module, a processor unit, a redundancy module and an ETHER NET/IP communication module are respectively arranged on the rack. When redundancy is realized, 2 sets of equipment are required to be installed in a uniform manner and are called as main and standby frames. Wherein the power module can provide power for the equipment on the whole rack (through the rack backboard); the processor unit is used as a core and is used for receiving the processing logic; the 2 redundant modules of the main and standby frames are connected through optical fibers to realize the redundant function of the processor; the ETHERNET/IP communication module enables the processor unit to connect and communicate with an external network (the processor unit itself does not include a network interface, and network connection is implemented through the module).

That is, in practical applications, the control module includes two sub-modules.

Any sub-module independently realizes the function of the control module; so that when the working equipment of the currently working submodule is powered off or fails, the redundant submodule is automatically switched to work.

According to the above description, the overall framework of the system is as shown in fig. 4:

the inputs include: a bin signal, a tilt signal, a drift signal, a twist signal, an inlet oxygen level signal, a feedback signal, and an emergency stop signal; the cabinet level signal, the inclination signal, the drift signal, the torsion signal and the inlet oxygen content signal are respectively obtained through the cabinet level meter, the piston inclination detector, the piston drift detector, the piston torsion detector and the inlet oxygen content monitor; the feedback signal is obtained through the actuating mechanism and is mainly used for feeding back the switching state of the valve; the emergency stop signal is obtained through an emergency stop button.

The control module is of the type 1756-L73 processor.

The output includes: and displaying pictures, giving an audible and visual alarm, controlling execution and peripheral communication.

Specifically, the feedback signal and the emergency stop signal are digital input signals and are respectively used for feeding back the switching state of the actuating mechanism and manually closing the feeding cut-off valve under emergency conditions. The output part comprises an executing mechanism, a digital output signal for controlling audible and visual alarm and the like and a communication signal for realizing a picture display function by the communication of an upper computer, and the scheme has an expansion function and can be interconnected with other system communication realization systems, namely, the output function of peripheral communication in fig. 4.

The technical scheme mainly realizes that 2 types of control loops of the feed cut-off valve are closed by a gas tank with high linkage and high feed oxygen content Gao Liansuo, and the control logic is shown in fig. 5:

(1) Starting.

(2) Judging whether the cabinet position meets a high alarm state.

If yes, executing the step (5); if not, executing the step (3).

The system alarm is divided into low alarm, high alarm and high alarm. The low alarm and the high alarm are alarm below a certain limit and alarm above a certain limit respectively. The high alarm is higher than a certain limit value as the high alarm is higher than the high alarm, but the limit value is larger than the high alarm, and the high alarm is more dangerous than the high alarm.

Systematic linkage is divided into low linkage, high linkage and high linkage. The low linkage and the high linkage are linkages below a certain limit and above a certain limit, respectively. The high-high linkage is higher than a certain limit linkage as is the high-high linkage, but the limit is larger than the high-high linkage.

In general, after high alarm is performed, high linkage is triggered, and other alarms are similar.

Linkage refers to actions after an alarm, such as closing a valve, etc. That is, different actions are executed by different linkages, and specific actions are not described herein, and the actions are only required to be within the protection scope of the present utility model according to the actual situation.

(3) And judging whether the oxygen content meets the high-high alarm state.

If yes, executing the step (5); if not, executing the step (4).

(4) Judging whether maintenance or emergency stop is needed.

If yes, go to step (5).

(5) The feed shut-off valve is closed.

(6) And (5) ending.

In this embodiment, the present utility model is a self-contained Safety Instrumented System (SIS) designed for a significant source of risk for gas tanks. The system comprises the input and monitoring of signal sources such as cabinet position, cabinet capacity, cabinet speed, torsion, drift, inclination, oxygen content and the like. The system comprises independent control signal output, and can execute related actions under the condition of meeting preset conditions to ensure that the operation of the gas tank is in a safe state. The control module adopts a redundant structure, so that the reliability of the SIS system is further enhanced. The system comprises an upper system, and can intuitively display the current state of the gas tank and alarm safety information. The upper system has the functions of hardware diagnosis, historical data storage, alarm historical storage, historical data, alarm inquiry and the like. The system can realize data interaction with other automatic control systems, such as access to an original process control system. Furthermore, compared with the existing gas tank piston state monitoring system, the system has the advantages that the input of an inlet oxygen content signal is increased, and a system hazard source is expanded. The gas tank is a completely independent safety instrument system, and is provided with independent control signal output and an independent actuating mechanism so as to ensure that the gas tank is in a safe state under dangerous conditions. The control module adopts a redundant design, so that the reliability of the SIS system is further improved.

It should be noted that the input signal types described in the present utility model are not limited, and other dangerous source signals can be added to further expand the system. The measuring mode of the piston inclination described by the utility model can be directly measured by adopting a differential pressure type or a laser range finder or a guided wave radar mode, is not limited by the utility model, and is characterized by having a height difference signal output. The number of the sensors of the cabinet position, torsion, inclination, drift, oxygen content and the like described by the utility model is the minimum requirement of the system, and the number can be multiplied to be 1 for 2 or 1 more, so that the measurement reliability is further improved. For example, the piston inclination measurement can be provided with 8 measuring cylinders, and can be divided into 2 groups of signals, each group of signals can independently calculate the maximum height and the corresponding direction of the inclination of the piston, and when the system judges that one group of signals fails, the system can automatically switch to the other group of signals. The number and types of control loops described in the present utility model are not limited, and other control signals may be added or actions may be performed, such as opening a gas tank bleed valve. The controller, the related input/output equipment model and the manufacturer provided by the utility model are not limiting to the utility model, and are mainly characterized by realizing corresponding functions.

Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present utility model.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A gas cell SIS system comprising: the device comprises a detection module, an input module, a control module, an output module and an execution unit;

the output end of the detection module is connected with the input end of the input module;

the output end of the input module is connected with the input end of the control module;

the output end of the control module is connected with the input end of the output module; the control module comprises two sub-modules; any sub-module independently realizes the function of the control module, so that when the working equipment of the currently working sub-module is powered off or fails, the redundant sub-module is automatically switched to work;

the output end of the output module is connected with the control end of the execution unit;

the detection module detects various parameter signals of the gas cabinet and transmits the various parameter signals to the control module through the input module; the control module processes the parameter signals according to the parameter signals to obtain a control instruction, and the control instruction is transmitted to the execution unit through the output module; the execution unit executes the valve closing/opening action according to the control instruction.

2. The gas cell SIS system of claim 1, further comprising: an upper computer system;

the upper computer system is connected with the control module and used for acquiring data corresponding to each parameter signal of the gas tank, the state of the execution unit and the alarm state;

the upper computer comprises historical data, alarm data and recording and inquiring functions of system faults.

3. The gas cell SIS system of claim 1, wherein the detection module employs at least one of differential pressure, laser rangefinder and guided wave radar detection.

4. The gas cell SIS system of claim 1, wherein the detection module comprises: the device comprises a cabinet level meter, a piston torsion detector, a piston drift detector, a piston inclination detector and an inlet oxygen content monitor;

the cabinet level meter is used for detecting a cabinet level signal of the gas cabinet;

the piston torsion detector is used for detecting torsion signals of the piston of the gas tank;

the piston drift detector is used for detecting a drift signal of the gas tank piston;

the piston inclination detector is used for detecting an inclination signal of the gas tank piston;

the inlet oxygen content monitor is used for detecting an inlet oxygen content signal of the gas tank.

5. The gas cell SIS system of claim 4, wherein the cell level gauge comprises a high precision laser sensor;

the cabinet level plan is divided into a light source part and a measured reflector part; the light source part is arranged on the top of the gas cabinet, and the measured reflector part is arranged on the reflecting plate of the gas cabinet.

6. The gas holder SIS system of claim 4, wherein the piston torsion detector is mounted in the center of the piston top of the gas holder using a high-precision tri-axis gyroscope as a sensor.

7. The gas holder SIS system according to claim 4, wherein the piston drift detector is a group of 4 living laser rangefinders, and the piston drift detectors are uniformly distributed and installed on the same horizontal plane on the outer piston platform of the gas holder; the piston drift detector moves along with the piston drift, faces the cabinet wall of the gas cabinet and measures the gap between the outer wall of the piston and the cabinet wall of the gas cabinet.

8. The gas cell SIS system of claim 4, wherein the piston tilt detector employs a set of 4 cartridges;

the measuring cylinder is cylindrical, is filled with nonvolatile liquid, and is uniformly distributed and installed on the same horizontal plane on the outer platform of the piston.

9. The gas holder SIS system of claim 8, wherein 4 of said cartridges are arranged in pairs perpendicular to each other in a line forming 2 pairs.