CN112984379A - Control method based on leakage compensation type positive pressure redundancy safety protection system - Google Patents
Control method based on leakage compensation type positive pressure redundancy safety protection system Download PDFInfo
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- CN112984379A CN112984379A CN202110164402.5A CN202110164402A CN112984379A CN 112984379 A CN112984379 A CN 112984379A CN 202110164402 A CN202110164402 A CN 202110164402A CN 112984379 A CN112984379 A CN 112984379A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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Abstract
The invention relates to the technical field of positive pressure redundancy safety protection, and discloses a control method based on a leakage compensation type positive pressure redundancy safety protection system; the safety protection system comprises a protective gas supply system and a safety protection system, wherein the protective gas supply system comprises a tee joint, a first gas supply pipe, a second gas supply pipe, a third gas supply pipe, a first one-way valve, a second one-way valve, a manual valve and a gas tank, the first end of the first gas supply pipe is connected to an air opening of an industrial instrument, the second end of the first gas supply pipe is connected to a first interface of the tee joint, the first end of the second gas supply pipe is connected to a second interface of the tee joint, the second end of the second gas supply pipe is connected to protected equipment, the first one-way valve is arranged on the second gas supply pipe, the first end of the third gas supply pipe is; the positive pressure purging device comprises a pressure relief module and a main control module which are in mutual gas connection, the control box assembly comprises a control module, a warning device and a first pressure detection mechanism, and the warning device and the first pressure detection mechanism are electrically connected with the control module.
Description
Technical Field
The invention relates to the technical field of positive pressure redundancy safety protection, in particular to a control method based on a leakage compensation type positive pressure redundancy safety protection system.
Background
With the increasing of the product types and the product scale of the industries such as petroleum, chemical industry, pharmacy and the like in China, various new products and new technologies emerge continuously, and higher requirements are put forward on the safety of the existing explosion-proof design scheme. The safety problem of equipment with high requirements on safety or special electrical and structure is mainly solved in dangerous places such as one area (a place where an explosive gas environment can appear in normal operation) or two areas (a place where the explosive gas environment cannot appear in normal operation; and a place which happens occasionally and exists only for a short time if the explosive gas environment appears).
At present, the adopted positive pressure protection scheme in China is that after the internal pressure of protected equipment is lower than a set pressure, a positive pressure protection system remotely transmits a stop signal to a DCS (distributed control system) of a user or automatically cuts off a power supply of the protected equipment to enable the protected equipment to stop immediately, and the purpose is to cut off an ignition source before positive pressure protection fails. However, some protected devices are not suitable for stopping immediately or igniting sources still exist for a period of time after the power supply is cut off, and the conventional positive pressure protection scheme is not perfect under the conditions, for example;
firstly, stirring equipment; when the internal pressure of the stirring equipment is lower than the set pressure value, the positive pressure protection system can give a stop signal or immediately cut off the power supply. Unplanned shutdown of the stirring equipment in a working period may cause scrapping of raw materials in the stirring tank, resulting in economic loss. It is not suitable for immediate parking.
And secondly, the protected equipment still has equipment of an ignition source in a period of shutdown, and when the internal pressure of the protected equipment is lower than a set pressure value, the positive pressure protection system can give a shutdown signal or immediately cut off a power supply. If the internal pressure of the protected equipment is reduced to the minimum pressure specified by the national standard and the ignition capability is still available in the protected equipment, the safety hazard exists at the moment.
The existing positive pressure protection system does not have the function of prejudging the failure of the sealing structure of the protected equipment, and only takes the pressure of the protected equipment after the failure of the sealing structure into consideration and then carries out linkage alarm or shutdown. The sealing glue or the sealing gasket has the possibility of aging and failure after being used for a long time, a general equipment manufacturer provides a sealing structure replacement period according to experience, but the sealing structure replacement period is difficult to control due to differences of equipment working conditions, environmental temperature, humidity, corrosion and the like, and the problems of uncontrollable replacement quality and the like bring hidden dangers to the safe operation of protected equipment.
Unexpected potential safety hazards can occur to protected equipment after the positive pressure purging device or the elements with the same functions break down. The positive pressure purging device manufacturers or the manufacturers with the same functional elements in China have less production experience, the failure rate is slightly high, the product reliability is poor, a standby system capable of maintaining normal operation of protected equipment after the purging device or the components with the same functions fail is not provided, and the problems bring potential safety hazards to the operation of the protected equipment.
Therefore, a control method based on a leakage compensation type positive pressure redundancy safety protection system is needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a control method based on a leakage compensation type positive pressure redundancy safety protection system, which can be used for predicting sealing failure and providing a standby scheme when a purging device fails, and avoiding the problems that the protected equipment is damaged by forced shutdown and an ignition source has ignition hidden danger after the protected equipment is shut down so as to protect the safety of the equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the control method based on the leakage compensation type positive pressure redundancy safety protection system is provided, aiming at the following leakage compensation type positive pressure redundancy safety protection system, the leakage compensation type positive pressure redundancy safety protection system comprises the following steps:
the protective gas supply system comprises a tee joint, a first gas supply pipe, a second gas supply pipe, a third gas supply pipe, a first one-way valve, a second one-way valve, a manual valve and a gas tank, wherein the first end of the first gas supply pipe is connected to an industrial instrument air opening, the second end of the first gas supply pipe is connected to a first interface of the tee joint, the first end of the second gas supply pipe is connected to a second interface of the tee joint, the second end of the second gas supply pipe is connected to protected equipment, the first one-way valve is arranged on the second gas supply pipe, the first end of the third gas supply pipe is connected to a third interface of the tee joint, the second end of the third gas supply pipe is connected to the protected equipment, the second one-way valve, the manual valve and the gas tank are all arranged on the third gas supply pipe, the second one-way valve is located on the upstream of the gas tank, and;
the positive pressure purging device comprises a pressure relief module and a main control module which are mutually and pneumatically connected, wherein the pressure relief module is installed on protected equipment, a pressure relief valve and a spark filter screen are arranged in the pressure relief module, the pressure relief valve is used for adjusting the internal pressure of the protected equipment, and the spark filter screen is used for filtering sparks or hot particles in gas exhausted by the protected equipment; the main control module can measure the internal pressure of the protected equipment and give a medium-low pressure alarm signal according to the measured internal pressure, the main control module is arranged on the second air supply pipe, and the main control module can also adjust the leakage amount of the pressure release valve;
the control box assembly comprises a control module, a warning device and a first pressure detection mechanism, wherein the warning device and the first pressure detection mechanism are electrically connected with the control module, and the first pressure detection mechanism is arranged on the protected equipment and is used for detecting the internal pressure of the protected equipment so as to enable the control module to judge the operation condition of the protected equipment; the main control module is electrically connected with the control module, the main control module can feed back a medium and low voltage alarm signal to the control module, and the control module controls the warning device to give an alarm.
The control method comprises the following steps:
s1, detecting the air pressure of the first air supply pipe, judging whether the detected air pressure is smaller than a first preset threshold value, and if so, giving an alarm; if not, the control module remotely transmits a starting signal of the positive pressure protection system;
s2, the control module controls to open the first control valve, starts timing and conveys protected gas into protected equipment so that the gas in the protected equipment is discharged through the pressure relief valve;
s3, when the pressure difference of the orifice plate flowmeter of the pressure relief valve reaches a second preset threshold value, the main control module starts timing, automatically ends timing after timing for a first preset time period, and transmits a timing end signal to the control module;
s4, when the timing of the main control module is finished and the control module receives the signal that the timing of the main control module is finished, starting to operate the protected device;
and when the main control module finishes timing and the control module does not receive a signal of finishing timing of the main control module, alarming.
As a preferred technical solution of a control method based on a leakage compensation type positive pressure redundancy safety protection system, the protective gas supply system further includes a first control valve and a second control valve, the first control valve is disposed on the second gas supply pipe and located at the upstream of the main control module, the second control valve is disposed on the third gas supply pipe and located at the downstream of the gas tank, and the first control valve and the second control valve are both electrically connected to the control module.
As a preferred technical solution of a control method based on a leakage compensation type positive pressure redundancy safety protection system, a pressure measurement point of the main control module on the protected device is the same as a pressure measurement point of the first pressure detection mechanism on the protected device in position.
As a preferable embodiment of the control method based on the leakage compensation type positive pressure redundant safety protection system, the protection gas supply system further includes a dry filter device provided on the third gas supply pipe and located upstream of the gas tank, and the second check valve is provided downstream of the dry filter device.
As a preferable technical solution of the control method based on the leakage compensation type positive pressure redundancy safety protection system, a safety valve is further arranged in the pressure relief module, and the safety valve is used for safely relieving pressure of the protected equipment.
As an optimal technical scheme based on the leakage compensation type positive pressure redundancy safety protection system, a pore plate flowmeter is arranged in the pressure release valve and used for testing the gas flow discharged by the pressure release valve.
As a preferable technical solution of a control method based on the leakage compensation type positive pressure redundancy safety protection system, the control box assembly further includes a second pressure detection mechanism, which is disposed on the first air supply pipe and electrically connected to the control module.
As an optimal technical scheme of a control method based on a leakage compensation type positive pressure redundancy safety protection system, the control box assembly further comprises a touch display device, the touch display device is electrically connected with the control module, the touch display device can display working condition information of protected equipment, and operating parameters of the protected equipment can be set through the touch display device.
As a preferred technical solution of the control method based on the leakage compensation type positive pressure redundancy safety protection system, during the operation of the protected device,
and when the internal pressure of the protected equipment is lower than a third preset threshold value, opening a second control valve to enable the gas tank to supplement gas for the protected equipment, and giving an alarm.
The invention has the beneficial effects that: the gas pitcher can keep in gas, can be when first air supply pipe air feed pressure crosses low or the unable air feed of trouble, and the gas pitcher can maintain by protective equipment's internal pressure for being protected equipment air feed, makes by protective equipment can continue to operate a period, avoids stopping immediately the loss that produces and the potential safety hazard that has the ignition source among the shut down process. The pressure relief valve regulates the internal pressure of the protected equipment, so that the internal pressure of the protected equipment cannot be too high, and the safety of the equipment is protected; the spark filter screen can filter spark or hot particles in the gas exhausted by the protected equipment, can prevent the spark or hot particles from being exhausted, and effectively prevents explosion and fire accidents; the main control module can measure the internal pressure of the protected equipment and give a medium-low pressure alarm signal according to the measured internal pressure, and can also adjust the leakage amount of the pressure release valve, so that a user can obtain the internal pressure signal of the protected equipment in time; the first pressure detection mechanism can detect the internal pressure of the protected equipment so that the control module judges the operation condition of the protected equipment and a user can control the protected equipment according to the operation condition; the control module controls the warning device to give an alarm, so that a user can obtain alarm information in time.
Moreover, whether the equipment instrument wind meets the requirements of the positive pressure protection system or not can be judged through the second pressure detection mechanism on the first air supply path; the opening and closing of the positive pressure purging device can be remotely controlled through a first control valve on the second air supply path; the working condition of the sealing structure of the protected equipment is judged according to the pressure change trend when the first pressure detection mechanism detects the protected equipment to make corresponding adjustment according to the working condition so as to protect the protected equipment.
Comparing the time of the positive pressure purging device in the starting process through the first control valve and the control module; comparing the pressure value detected by the first pressure detection mechanism with the alarm pressure of the positive pressure purging device when the protected equipment is depressurized to the medium pressure; the first pressure detection mechanism detects a medium-pressure alarm and the main control module does not output a medium-pressure alarm signal for comparison; judging the working condition of the positive pressure purging device; and protective gas can be provided to protect the protected equipment after the positive pressure protection device fails through the third gas supply pipe.
Drawings
Fig. 1 is a schematic structural diagram of a positive pressure redundancy safety protection system based on leakage compensation provided by the invention.
In the figure: 1. a pressure relief module; 2. a second pressure detection mechanism; 3. a first control valve; 4. a main control module; 5. a first check valve; 6. a first pressure detection mechanism; 7. a control box assembly; 8. a second control valve; 9. a manual valve; 10. a gas tank; 11. a second one-way valve; 12. a drying and filtering device;
100. a protected device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
FIG. 1 is a schematic structural diagram of a positive pressure redundancy safety protection system based on leakage compensation provided by the invention; wherein A is a gas flow passage, B is a signal transmission passage, and C is a gas flow direction.
As shown in fig. 1, the present embodiment discloses a positive pressure redundancy safety protection system based on leakage compensation, which includes a shielding gas supply system, a positive pressure purging device and a control box assembly 7.
The positive pressure purging device comprises a pressure relief module 1 and a main control module 4 which are mutually and pneumatically connected, and the control box component 7 comprises a control module, a warning device and a first pressure detection mechanism 6. The protective gas supply system comprises a tee joint, a first gas supply pipe, a second gas supply pipe, a third gas supply pipe, a first one-way valve 5, a second one-way valve 11, a manual valve 9, a gas tank 10, a first control valve 3 and a second control valve 8.
The first end of the first gas supply pipe is connected to the industrial instrument wind port, and the industrial instrument wind provides protective gas with the general pressure of (0.4-1.0) MPa by a user and provides the protected gas for the first gas supply pipe. The second end of the first gas supply pipe is connected to a first connector of the tee joint. The second gas supply pipe has a first end connected to the second port of the tee and a second end connected to the protected apparatus 100. A first check valve 5 is provided on the second gas supply pipe and a first control valve 3 is provided on the second gas supply pipe upstream of the first check valve 5. The first control valve 3 is an explosion-proof electric valve, is electrically connected with the control module, and is controlled by the control module to open and close. The first check valve 5 is a mechanical check valve, and the first check valve 5 can prevent gas backflow in the protected apparatus 100.
The third gas supply pipe has a first end connected to the third port of the tee and a second end connected to the protected apparatus 100. The second control valve 8, the second check valve 11, the manual valve 9, and the gas tank 10 are all provided on the third gas supply pipe, the second check valve 11 is located upstream of the gas tank 10, the manual valve 9 is located downstream of the gas tank 10, and the second control valve 8 is located downstream of the manual valve 9. The second control valve 8 is an explosion-proof electric valve and is electrically connected with the control module, and the operation of the second control valve is controlled by the control module. The second check valve 11 is a mechanical check valve, and the second check valve 11 can prevent reverse flow of gas in the gas tank 10. The manual valve 9 adopts a mechanical valve, and the manual valve 9 is used for adjusting the gas pressure and flow in the third gas supply pipe, so that the resistance of the pipeline system can be changed.
The protective gas supply system further comprises a dry filter device 12, which dry filter device 12 is arranged on the third gas supply pipe upstream of the gas tank 10, in particular upstream of the second non return valve 11. The drying and filtering device 12 is used for drying and filtering the protective gas entering the gas tank 10, so as to ensure the dryness and cleanness of the protective gas entering the protected equipment 100 and avoid water accumulation in the gas tank 10. When the pressure of the gas tank 10 is lower than the gas pressure of the first gas supply pipe, the first gas supply pipe automatically supplies gas to the gas tank 10, and the gas pressure of the gas tank is ensured to be in a normal state.
Pressure release module 1 and 4 gas connections of host system, host system 4 is connected with the control module electricity, pressure release module 1 installs on being protected equipment 100, be provided with the relief valve in the pressure release module 1, spark filter screen and relief valve, be provided with the orifice plate flowmeter in the relief valve, the orifice plate flowmeter specifically is the pressure release orifice plate of setting in the relief valve, the both ends of pressure release orifice plate are provided with the pressure measurement hole, can make the relief valve double as the orifice plate flowmeter, the orifice plate flowmeter is used for testing the gas flow that the relief valve discharged. The data of the orifice plate flowmeter test can be fed back to the main control module 4. And the pressure relief valve is provided with a mechanical structure cover plate capable of adjusting the pressure, and the cover plate is opened or closed after the pressure reaches a set value, so that the pressure relief valve adjusts the internal pressure of the protected equipment 100. The spark filter screen is used for filtering sparks or hot particles in exhaust gas, and the safety valve is used for safely relieving pressure of the protected device 100, and particularly opens for pressure relief when the internal pressure of the protected device 100 is higher than the safety pressure. The safety valve is provided with a mechanical structure cover plate with adjustable pressure, and the cover plate is opened or closed after the pressure reaches the safety pressure, so that the safety valve is decompressed.
The main control module 4 is arranged on the second air supply pipe and the protected equipment 100 and is positioned between the first control valve 3 and the first one-way valve 5. The main control module 4 can measure the internal pressure of the protected device 100, and can give a medium-low pressure alarm signal according to the measured internal pressure, and the main control module 4 can also adjust the leakage amount of the pressure release valve. The main control module 4 is internally provided with a pressure switch unit, a gas-electricity conversion switch, a signal processing unit, a gas filter, a pressure gauge, a replacement gas circuit and a compensation gas circuit. The replacement gas circuit is used for supplying safe gas to replace explosive gas before the protected equipment 100 is started, and the gas flow is large. The compensation loop is used for compensating safety gas leaked by the protected equipment 100 due to the internal and external pressure difference after being replaced by the protected equipment 100, and the gas amount is small. The pressure switch unit is used to measure the internal pressure of the protected device 100. The main control module 4 can also output an alarm signal to the control module, and then the control module performs interlocking control. When the main control module 4 detects that the back pressure of the protected device 100 is too low, the middle and low pressure alarm signal can be fed back to the control module, and the control module controls the alarm device to alarm and other operations. The master control module 4 can also set the differential pressure of the orifice plate flow meter to regulate the amount of leakage. The main control module 4 can set the gas replacement time and adjust the gas replacement amount. The main control module 4 can also automatically switch from the replacement gas path into the leakage compensation gas path after the gas replacement is finished.
The warning device and the first pressure detection mechanism 6 are electrically connected with the control module, wherein the first pressure detection mechanism 6 is a pressure sensor, and the first pressure detection mechanism 6 is arranged on the protected device 100 and used for detecting the internal pressure of the protected device 100, so that the control module judges the operation condition of the protected device 100. The pressure measurement point of the main control module 4 on the protected device 100 is the same as the pressure measurement point of the first pressure detection mechanism 6 on the protected device 100, so that the problem of inaccurate measurement result caused by pressure difference at different positions can be avoided. A programmable controller (PLC) is arranged in the control module; the control box assembly 7 is of a sealed box structure, and further comprises a box body and a touch display device. The control module sets up in the box, and warning device and touch display device all set up on the shell of box, and all are connected with the control module electricity, and touch display device specifically is touch display screen. The touch display device can display the working condition information of the protected equipment 100, the main control module 4, each sensor and the valve, and the operating parameters of the components can be set through the touch display device.
The control box assembly 7 further comprises a second pressure detection mechanism 2, which is arranged on the first air supply pipe and electrically connected with the control module, and the second pressure detection mechanism 2 is used for detecting the air supply pressure of the first air supply pipe. The first pressure detection means 6 and the second pressure detection means 2 are both pressure sensors.
The warning device comprises a power switch, an alarm lamp and a buzzer, wherein the alarm lamp and the buzzer are both electrically connected with the power switch, and the alarm lamp and the buzzer are controlled by the power switch to alarm so as to warn a worker. The power switch is electrically connected with the control module, and the control module controls the power switch to control the alarm lamp and the buzzer to alarm. And when alarming, displaying fault information, and displaying various set curves and fault reasons on the touch display screen. The alarm lamp and the buzzer can simultaneously carry out sound-light alarm, and the warning effect is better.
The main control module 4 can feed back the medium and low voltage alarm signal to the control module, and the control module controls the warning device to give an alarm. The control module can also receive and process the signal fed back by the main control module 4 to judge the operation condition of the protected device 100. The control module can also set a high-pressure alarm according to the pressure data detected by the first pressure detection mechanism 6 and lock and open the second control valve 8 on the third gas supply path to supplement gas to the protected device 100. The opening time of the first control valve 3 on the second gas supply path can be compared with the time of the positive pressure purging device in the starting process; the pressure detected by the first pressure detection mechanism 6 is compared with the medium-pressure alarm pressure of the positive-pressure purging device in the protected equipment 100; the first pressure detection mechanism detects a medium-pressure alarm, but the main control module 4 does not output a medium-pressure alarm signal for comparison; and judging the working condition of the positive pressure purging device. And the control module, each pressure detection mechanism and the third gas supply circuit can continue to protect the protected equipment 100 after the positive pressure purging device fails. The control module can also automatically cut off the power supply of the protected equipment 100 and remotely transmit a shutdown signal to the user PLC system when a low-voltage signal (shutdown signal) is fed back by the main control module 4. The control module can also remotely start and close the positive pressure purging device.
The gas tank 10 can temporarily store gas, and when the gas supply pressure of the first gas supply pipe is too low or the gas supply fails due to faults, the gas tank 10 can supply gas to the protected device 100 to maintain the internal pressure of the protected device 100, so that the protected device 100 can continue to operate for a period of time, and the loss caused by immediate shutdown and the potential safety hazard of ignition sources in the shutdown process are avoided. The pressure relief valve regulates the internal pressure of the protected equipment 100, so that the internal pressure of the protected equipment 100 can not be too high, and the safety of the equipment is protected; the spark filter screen can filter spark or hot particles in the gas exhausted by the protected equipment 100, can prevent the spark or hot particles from being exhausted, and effectively prevents explosion and fire accidents; the main control module 4 can measure the internal pressure of the protected equipment 100 and can give a medium-low pressure alarm signal according to the measured internal pressure, and the main control module 4 can also adjust the leakage amount of the pressure release valve, so that a user can obtain the internal pressure signal of the protected equipment 100 in time; the first pressure detection mechanism 6 can detect the internal pressure of the protected device 100, so that the control module can judge the operation condition of the protected device 100, and a user can control the protected device 100 according to the operation condition; the control module controls the warning device to give an alarm, so that a user can obtain alarm information in time.
Example two
The embodiment also discloses a control method based on the leakage compensation type positive pressure redundancy safety protection system, which aims at the leakage compensation type positive pressure redundancy safety protection system in the first embodiment, and the control method comprises the following steps:
s1, detecting the air pressure of the first air supply pipe, judging whether the detected air pressure is smaller than a first preset threshold value, and if so, giving an alarm; if not, the control module remotely transmits a starting signal of the positive pressure protection system;
s2, opening the first control valve 3, starting timing by the control module, and delivering protected gas into the protected equipment 100 to discharge the gas in the protected equipment 100 through the pressure relief valve;
s3, when the pressure difference of the orifice plate flowmeter of the pressure relief valve reaches a second preset threshold value, the main control module 4 starts timing, automatically finishes timing after timing for a first preset time period, and transmits a timing finishing signal to the control module, wherein the second preset threshold value is a timing starting pressure value of the main control module 4;
s4, when the main control module finishes timing and the control module receives a signal that the timing of the main control module 4 is finished, starting to operate the protected device 100;
and when the main control module finishes timing and the control module does not receive a signal of finishing timing of the main control module 4, alarming.
EXAMPLE III
The embodiment also discloses a control method based on the leakage compensation type positive pressure redundancy safety protection system, which aims at the leakage compensation type positive pressure redundancy safety protection system in the first embodiment, and the control method comprises the following steps:
s1, detecting the air pressure of the first air supply pipe, judging whether the detected air pressure is smaller than a first preset threshold value, and if so, giving an alarm; if not, the control module remotely transmits a starting signal of the positive pressure protection system. Specifically, the second pressure detection mechanism 2 detects the pressure value of the gas in the first gas supply pipe, transmits the detected value to the control module, and the control module judges whether the detected gas pressure is smaller than a first preset threshold value; if the detected air pressure value is smaller than a first preset threshold value, wherein the first preset threshold value is the lowest working pressure of the positive pressure purging device, the control module controls the warning device to give an air supply low-pressure warning, displays the warning on the touch display device and simultaneously transmits a warning signal to the user PLC system. And if the detected air pressure value is not less than the first preset threshold value, the control module remotely transmits a starting signal of the positive pressure protection system.
S2, opening the first control valve 3, and delivering the protected gas into the protected equipment 100, so that the gas in the protected equipment 100 is discharged through the relief valve, and the control module starts timing; specifically, the control module controls to open the first control valve 3, the protection gas flows to the protected device 100 through the first control valve 3, the replacement gas path in the main control module 4 and the first check valve 5, and the protected gas is conveyed into the protected device 100. The gas (specifically, the explosive gas and the safety gas) inside the protected apparatus 100 is discharged through the relief valve to replace the explosive gas inside the protected apparatus 100. And simultaneously, the control module starts timing. The gas displaced in the protective equipment is discharged to the environment after being filtered by the spark filter screen after passing through the orifice flowmeter of the pressure release valve.
And S3, when the pressure difference of the orifice plate flowmeter of the pressure relief valve reaches a second preset threshold value, the main control module 4 starts timing, automatically finishes timing after timing for the first preset time, and transmits a timing finishing signal to the control module, wherein the second preset threshold value is a timing starting pressure value of the main control module 4. Specifically, the differential pressure value at two ends of the orifice plate flowmeter of the pressure release valve is detected and fed back to the main control module 4, and the main control module 4 determines whether the detected differential pressure value reaches a second preset threshold value. After the differential pressure value reaches a second preset threshold value, the main control module 4 starts timing; the main control module 4 automatically ends timing after timing the first preset time length, and transmits a timing end signal to the control module. The main control module 4 enters a leakage compensation state at the same time, the gas leaked by the protected device 100 is supplemented by a small flow, and the internal pressure value of the protected device 100 is maintained to meet the design requirement.
And S4, when the timing of the main control module is finished and the control module receives a signal that the timing of the main control module 4 is finished, the positive pressure purging device is proved to correctly perform purging work, the explosive gas in the protected equipment 100 is discharged, the protected equipment 100 is in a safe state, and the operation can be started. Thus, the protected apparatus 100 is started to operate.
After the master control module finishes timing, and the control module does not receive a signal of finishing timing of the master control module 4, the positive pressure purging device is indicated to have a fault and cannot be started, the control module controls the warning device to send out an alarm signal, and simultaneously transmits the alarm signal to the user PLC system and controls the touch display screen to display fault information.
During the operation of the protected device 100:
the first pressure detection mechanism 6 detects the pressure value in real time, when the pressure change value and the change trend detected by the first pressure detection mechanism 6 reach the seal failure alarm value (the seal structure of the protected device 100 fails), the control module controls the warning device to send out an alarm signal, simultaneously transmits the alarm signal to the user PLC system, and simultaneously controls the touch display screen to display fault information. The user is ready to shut down and repair or replace the seal. After maintenance and replacement, the protected equipment 100 is started again, the measured value of the first pressure detection mechanism 6 can continue to operate after reaching the set value, and if not, an alarm is given, the leakage point is rechecked, and sealing is strengthened.
When the internal pressure of the protected equipment 100 is lower than a third preset threshold value, the second control valve 8 is opened to make the gas tank 10 supplement gas for the protected equipment 100, and an alarm is given. The third preset threshold is a high pressure alarm value, which is a relative ratio to the medium pressure alarm value in the first embodiment and is not the safety pressure in the first embodiment, and the third preset threshold (the high pressure alarm value) is lower than the air pressure in the first air supply pipe when the first air supply pipe normally supplies air, that is, the air pressure in the air tank 10 at the moment. Specifically, when the pressure value detected by the first pressure detection mechanism 6 is lower than a third preset threshold, the control module controls to open the second control valve 8, so that the gas tank 10 is replenished with gas for the protected device. Meanwhile, the control module controls the warning device to send out an alarm signal, simultaneously transmits the alarm signal to the user PLC system, and simultaneously controls the touch display screen to display fault information. Requiring the user to shut down for maintenance to enable later normal operation of the protected apparatus 100.
When the internal pressure of the protected device 100 is higher than the safety threshold, the safety valve of the pressure relief module 1 opens for pressure relief. Specifically, when the internal pressure of the protected apparatus 100 detected by the first pressure detecting mechanism 6 is higher than the safety threshold, the safety valve of the pressure relief module 1 automatically opens to relieve the pressure, so that the internal pressure of the protected apparatus 100 is lower than the safety threshold, and the protected apparatus 100 can operate within the normal internal pressure range.
After the second control valve 8 is opened, when the gas tank 10 is used for supplying gas to the protected device 100; when the internal pressure of the protected device 100 detected by the first pressure detection mechanism is lower than the medium-pressure alarm value, the main control module 4 transmits a shutdown signal to the control module, and the control module transmits the shutdown signal to the user PLC system to require the user to shut down immediately. When the internal pressure of the protected equipment 100 is lower than the low-voltage alarm value, the control module automatically cuts off the power supply of the protected equipment 100.
After the internal pressure of the protected equipment 100 is lower than a third preset threshold value, the gas tank 10 supplies gas for the protected equipment 100 for the second time through the third gas supply pipe, so that the internal pressure of the protected equipment 100 is ensured to be recovered to a safe value, and the loss caused by immediate shutdown and the potential safety hazard of an ignition source in the shutdown process are avoided. The first pressure detection mechanism 6 and the control module judge the failure condition of the sealing structure according to the pressure value and the pressure change trend, and can judge whether the sealing structure of the protected device 100 after maintenance meets the requirements. The arrangement of the first check valve 5, the second control valve 8, the control module and the gas tank 10 can supply gas to the protected equipment 100 through the gas tank 10 after the supply of the protective gas is interrupted, so that the internal pressure of the protected equipment 100 is maintained, the protected equipment 100 can continuously run for a period of time, and the loss caused by immediate shutdown and the potential safety hazard of an ignition source in the shutdown process are avoided.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A control method based on a leakage compensation type positive pressure redundancy safety protection system is characterized in that the leakage compensation type positive pressure redundancy safety protection system comprises the following steps:
the protective gas supply system comprises a tee joint, a first gas supply pipe, a second gas supply pipe, a third gas supply pipe, a first one-way valve (5), a second one-way valve (11), a manual valve (9) and a gas tank (10), wherein the first end of the first gas supply pipe is connected to an industrial instrument air opening, the second end of the first gas supply pipe is connected to a first interface of the tee joint, the first end of the second gas supply pipe is connected to a second interface of the tee joint, the second end of the second gas supply pipe is connected to protected equipment (100), the first one-way valve (5) is arranged on the second gas supply pipe, the first end of the third gas supply pipe is connected to a third interface of the tee joint, the second end of the third gas supply pipe is connected to the protected equipment (100), the second one-way valve (11), the manual valve (9) and the gas tank (10) are arranged on the third gas supply pipe, and the second one-way valve (11) is positioned at the upstream, the manual valve (9) is located downstream of the gas tank (10);
the positive pressure purging device comprises a pressure relief module (1) and a main control module (4) which are mutually and pneumatically connected, wherein the pressure relief module (1) is installed on a protected device (100), a pressure relief valve and a spark filter screen are arranged in the pressure relief module (1), the pressure relief valve is used for adjusting the internal pressure of the protected device (100), and the spark filter screen is used for filtering sparks or hot particles in the gas exhausted by the protected device (100); the main control module (4) can measure the internal pressure of the protected equipment (100) and can give a medium-low pressure alarm signal according to the measured internal pressure, the main control module (4) is arranged on the second air supply pipe, and the main control module (4) can also adjust the leakage amount of the pressure release valve;
the control box assembly (7) comprises a control module, a warning device and a first pressure detection mechanism (6), the warning device and the first pressure detection mechanism (6) are both electrically connected with the control module, and the first pressure detection mechanism (6) is arranged on the protected equipment (100) and used for detecting the internal pressure of the protected equipment (100) so that the control module can judge the operation condition of the protected equipment (100); the main control module (4) is electrically connected with the control module, the main control module (4) can feed back a medium and low voltage alarm signal to the control module, and the control module controls the warning device to give an alarm.
The control method comprises the following steps:
s1, detecting the air pressure of the first air supply pipe, judging whether the detected air pressure is smaller than a first preset threshold value, and if so, giving an alarm; if not, the control module remotely transmits a starting signal of the positive pressure protection system;
s2, the control module controls to open the first control valve (3), starts timing and conveys protected gas into the protected equipment (100) so that the gas in the protected equipment (100) is discharged through the pressure relief valve;
s3, when the pressure difference of the orifice plate flowmeter of the pressure relief valve reaches a second preset threshold value, the main control module (4) starts timing, automatically ends timing after timing for a first preset time period, and transmits a timing end signal to the control module;
s4, when the timing of the main control module (4) is finished and the control module receives a signal that the timing of the main control module (4) is finished, starting to operate the protected device (100);
and when the timing of the main control module (4) is finished and the control module does not receive a signal of finishing the timing of the main control module (4), alarming.
2. The control method of the leak-compensated positive pressure redundancy-based safety protection system according to claim 1, wherein the protection gas supply system further comprises a first control valve (3) and a second control valve (8), the first control valve (3) being disposed on the second gas supply pipe and upstream of the main control module (4), the second control valve (8) being disposed on the third gas supply pipe and downstream of the gas tank (10), the first control valve (3) and the second control valve (8) being electrically connected to the control module.
3. The control method based on the leakage compensation type positive pressure redundancy safety protection system according to claim 1, wherein the pressure measuring point of the main control module (4) on the protected device (100) and the pressure measuring point of the first pressure detection mechanism (6) on the protected device (100) are in the same position.
4. The control method based on the leakage compensated positive pressure redundant safety protection system according to claim 1, characterized in that the protection gas supply system further comprises a dry filter device (12), the dry filter device (12) being provided on the third gas supply pipe upstream of the gas tank (10), the second one-way valve (11) being provided downstream of the dry filter device (12).
5. The control method based on the leakage compensation type positive pressure redundancy safety protection system according to claim 1, characterized in that a safety valve is further arranged in the pressure relief module (1), and the safety valve is used for safely relieving pressure of the protected equipment (100).
6. The control method based on the leakage compensation type positive pressure redundancy safety protection system according to claim 1, wherein an orifice plate flowmeter is arranged in the pressure release valve and used for testing the gas flow discharged by the pressure release valve.
7. The positive pressure redundant safety protection system based on leakage compensation type as claimed in claim 1, wherein the control box assembly (7) further comprises a second pressure detection mechanism (2) disposed on the first air supply pipe and electrically connected with the control module.
8. The control method based on the leakage compensation type positive pressure redundancy safety protection system according to claim 1, wherein the control box assembly (7) further comprises a touch display device electrically connected with the control module, the touch display device can display the working condition information of the protected equipment (100), and the operation parameters of the protected equipment (100) can be set through the touch display device.
9. The control method based on the leakage compensated positive pressure redundancy safety protection system according to claim 1, wherein during the operation of the protected device (100),
when the internal pressure of the protected equipment (100) is lower than a third preset threshold value, a second control valve (8) is opened so that the gas tank (10) supplies gas for the protected equipment (100), and an alarm is given.
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