Industrial gas holder position safe operation early warning system

Abstract

The utility model relates to the technical field of measuring instruments, in particular to an early warning system for safe operation of a cabinet position of an industrial gas cabinet, and aims to solve the problem that static pressure type and optical fiber type measuring devices and the like are conventionally adopted in the cabinet position detection process of the industrial gas cabinet at present. Usually, the cabinet position high-low limit alarm function of the industrial gas cabinet is limited and is easily interfered by lightning stroke and the like, and finally cabinet position measurement is not accurate. The system mainly comprises a radar level meter, a reflecting plate, a current detection safety barrier, an alarm, a PLC (programmable logic controller) and the like, and by adopting linkage of the integrated high-frequency radar level meter, the current detection safety barrier, the flash alarm and an electric bell, the operation safety of the cabinet position of the industrial gas cabinet is improved, the uncertain operation risk is reduced, and the safety of the industrial gas cabinet is improved. The fault and risk of the cabinet position can be predicted in time, operators are guided to make correct judgment and operation, equipment accidents are obviously avoided, the operation safety and efficiency of the gas cabinet are improved, and therefore the overall operation efficiency of the industrial gas cabinet is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring instruments, in particular to an industrial gas cabinet safe operation early warning system. Background Art

[0002] Steel enterprises can effectively recycle and release gas by setting up gas holders, which can fully and reasonably use the by-product gas within the enterprise and reduce the energy consumption of the steel plant. Secondly, when the gas source is interrupted, it can maintain a stable pipeline pressure to ensure safe production. In order to ensure the safe, stable and efficient operation of the gas holder, the height of the gas holder is monitored in real time, and the gas holder position is controlled by opening and closing the inlet and outlet valves on the gas pipeline. Therefore, accurate measurement of the gas holder position is a very important link. Currently, the commonly used gas holders are equipped with optical fiber position meters and static pressure position meters according to the volume and characteristics of the gas holder itself to jointly realize continuous measurement and interlocking protection of the height of the position. However, there are many problems in the actual operation and detection process on site, and the safe and reliable operation of the gas holder cannot be fully guaranteed. The main reasons are as follows: the alarm system of the gas tank position is not perfect, the detection alarm function of the gas tank position is not perfect, the high and low limit alarm function settings of each gas tank position are not unified, and the gas tank cannot implement pre-alarm when the position is running to the high and low positions, and the pre-alarm function cannot play a role, making it impossible for operators to manually stabilize the gas tank position within the effective time. At the same time, the alarm setting of the HMI screen is unreasonable, and the alarm only appears in the form of an alarm information bar. When other alarm information appears, the alarm information of the cabinet automatically overflows the alarm box, and the alarm record cannot be effectively monitored. In addition, the alarm threshold and protection limit value of the gas tank are set unreasonably, and cannot fully play a role in stabilizing the operation of the gas tank; the reliability of the cabinet measurement device currently used is poor, and the gas tank instrument cabinet detection device is installed with different types of measuring devices such as static pressure type and optical fiber type. The existing electronic measuring device signals are all converted to PLC through the secondary table to perform logical operations and realize the interlocking function. In the process of signal transmission, it is easy to be interfered and struck by lightning, etc. External factors may cause equipment damage or inaccurate measurements, and the failure rate of mechanical connections is high. During winter operation, the low temperature and adverse environmental factors may cause the wire rope to freeze, break, sluice, and fall out of the groove. The hose used to connect the pressure pipe of the static pressure cabinet gauge may age and crack, and the pressure liquid may leak, causing inaccurate cabinet measurements, thereby triggering the interlock alarm action. It cannot play a good cabinet monitoring role and cannot provide real and effective operation data for the personnel on duty. The instruments and equipment used on site do not meet the requirements for use in explosion-proof areas, and the gas cabinet detection instruments are not equipped in accordance with relevant national standards. Through a census, it was found that some instruments in the gas cabinet area used intrinsically safe instruments for primary detection equipment, but the secondary instrument signal isolator did not use intrinsically safe safety barriers. Some instruments did not use intrinsically safe instruments in both the primary and secondary areas. There are great safety hazards when used in explosion-hazardous areas. When the equipment is struck by lightning, sparks are generated in the electrical circuit, or the equipment fails, it is very likely to ignite dangerous gases, causing major safety accidents. Utility Model Content

[0003] The utility model provides an industrial gas cabinet safe operation early warning system to solve the problems existing in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An industrial gas tank cabinet safe operation early warning system comprises a gas tank, wherein a gas tank piston floating top is arranged on the inner side of the gas tank, a first radar level meter, a second radar level meter and a third radar level meter are fixedly arranged on the inner side of the gas tank, and a first radar reflecting plate, a second radar reflecting plate and a third radar reflecting plate are matched with the top of the gas tank piston floating top directly facing the first radar level meter, the second radar level meter and the third radar level meter, respectively, the first radar level meter, the second radar level meter and the third radar level meter are connected with a first current detection end safety gate, a second current detection end safety gate and a third current detection end safety gate, respectively, the first current detection end safety gate, the second current detection end safety gate and the third current detection end safety gate are connected with a flash alarm, and the first current detection end safety gate, the second current detection end safety gate, the third current detection end safety gate and the flash alarm are all connected to a PLC controller.

[0006] Furthermore, a bracket is horizontally fixedly provided on the inner side of the gas tank, and the first radar level meter, the second radar level meter and the third radar level meter are all detachably connected to the bracket.

[0007] Furthermore, the output end of the flash alarm is also connected in parallel with an electric bell, a test button and a confirmation button.

[0008] The utility model has the following beneficial effects:

[0009] The utility model provides an industrial gas cabinet safe operation warning system, which is mainly composed of components such as a radar level meter, a radar reflector, a current detection end safety grid, a flash alarm and a PLC controller. By adopting the interlocking of an integrated high-frequency radar level meter, a current detection end safety grid, a flash alarm and an electric bell, the safety of the industrial gas cabinet operation is improved, the uncertain operation risk is reduced, and the cabinet failure and risk are predicted in time, and the operating personnel are guided to make correct judgments and operations, which significantly avoids the occurrence of equipment accidents, improves the safety and efficiency of the gas cabinet operation, and thus improves the overall efficiency of the industrial gas cabinet operation, and solves the problem that in the current process of industrial gas cabinet detection, the conventional use of static pressure type and optical fiber type measuring devices usually leads to limited high and low limit alarm functions of the industrial gas cabinet and is extremely susceptible to interference such as lightning strikes, which ultimately causes inaccurate cabinet measurement.

[0010] In the utility model, when the tested gas tank cabinet deviates from the specified value or the operating status is abnormal, an audio and light signal is issued, and the display is intuitive and clear to warn the on-duty personnel to make correct judgments, reduce uncertain risk assessments and restrictions, predict faults and risks in time, and ensure the safe operation of the gas tank cabinet.

[0011] In order to avoid unnecessary false alarms due to false signals, the gas tank position parameters in the utility model adopt a multi-sensor control logic and define a delay. When the early warning system receives a signal exceeding the trip limit, at least two independent radar level meters confirm the signal at the same time, and only when the signal exceeds the limit within the specified time will a danger alarm signal be issued, which can avoid the occurrence of vicious equipment accidents, improve the safety of the gas tank and reduce economic losses.

[0012] In the utility model, all gas cabinets realize four-level alarm, namely low-low alarm, low alarm, high alarm and high-high alarm. The low alarm and high alarm are pre-alarm values. When the cabinet reaches the set threshold, the first sound and light alarm is issued to remind the operator to pay attention to the operation status of the gas cabinet and conduct manual intervention when appropriate to keep the cabinet running smoothly; when the low-low alarm and high-high alarm thresholds are reached, the second sound and light alarm is issued, and the interlocking action conditions are triggered to automatically open the gas release valve or automatically open and close the gas inlet and outlet valves. When the gas cabinet returns to the normal cabinet, the gas outlet valve is manually opened to release the alarm and interlock.

[0013] The utility model fundamentally guarantees the safe production of the gas holder, plays a positive role in balancing gas use, improving gas utilization, reducing emissions, and lowering energy consumption, implements full-process detection and monitoring of the operation of the gas holder, and plays an important role in ensuring the normal operation and safety of the gas holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] The meanings of the reference numerals are as follows:

[0016] 1. The first radar level meter; 2. The second radar level meter; 3. The third radar level meter; 4. The first radar reflector; 5. The second radar reflector; 6. The third radar reflector; 7. The first current detection end safety barrier; 8. The second current detection end safety barrier; 9. The third current detection end safety barrier; 10. The electric bell; 11. The test button; 12. The confirmation button; 13. The flash alarm; 14. The PLC controller; 15. The gas tank; 16. The gas tank piston floating top; 17. The bracket. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown, an industrial gas tank cabinet safe operation early warning system comprises a gas tank 15, a gas tank piston floating roof 16 is arranged on the inner side of the gas tank 15, a first radar level meter 1, a second radar level meter 2 and a third radar level meter 3 are fixedly arranged on the inner side of the gas tank 15, and a first radar reflecting plate 4, a second radar reflecting plate 5 and a third radar reflecting plate 6 are matched with the top of the gas tank piston floating roof 16 directly facing the first radar level meter 1, the second radar level meter 2 and the third radar level meter 3, respectively, the first radar level meter 1, the second radar level meter 2 and the third radar level meter 3 are connected with a first current detection end safety gate 7, a second current detection end safety gate 8 and a third current detection end safety gate 9, respectively, the first current detection end safety gate 7, the second current detection end safety gate 8 and the third current detection end safety gate 9 are connected with a flash alarm 13, and the first current detection end safety gate 7, the second current detection end safety gate 8, the third current detection end safety gate 9 and the flash alarm 13 are all connected to a PLC controller 14.

[0019] A bracket 17 is horizontally fixedly provided on the inner side of the gas tank 15 , and the first radar level meter 1 , the second radar level meter 2 and the third radar level meter 3 are all detachably connected to the bracket 17 .

[0020] The output end of the flash alarm 13 is also connected in parallel with the bell 10, the test button 11 and the confirmation button 12.

[0021] In the specific application of the utility model, the first current detection end safety gate 7, the second current detection end safety gate 8 and the third current detection end safety gate 9 respectively output a 4-20mA current signal to the PLC controller 14, the PLC controller 14 outputs 3 switch quantity signals to the input end of the flash alarm 13, the first current detection end safety gate 7, the second current detection end safety gate 8 and the third current detection end safety gate 9 respectively output two relay contact signals to the input end of the flash alarm 13, the first radar reflector 4, the second radar reflector 5 and the third radar reflector 6 are respectively fixed horizontally on the top of the gas tank piston floating roof 16. The first radar level meter 1, the second radar level meter 2 and the third radar level meter 3 all use VEGA VEGAPULS69 high frequency radar, measuring range 120m, measuring deviation ±5mm, working voltage 12~35V.DC, frequency 80GHZ, when the first radar level meter 1, the second radar level meter 2 and the third radar level meter 3 are installed on the top, there is no shielding below, the installation distance between every two radar level meters is more than 3m, the first radar reflector 4, the second radar reflector 5 and the third radar reflector 6 are all 5m*5m radar reflectors (one each on the left, middle and right), fixed horizontally on the top of the gas tank piston floating roof 16, reflecting The center position of the plate is determined according to the installation position of the radar level meter on the cabinet top, and is perpendicular to the flange center of the radar level meter. The first current detection end safety barrier 7, the second current detection end safety barrier 8 and the third current detection end safety barrier 9 use NPEXA-C31A2 one-input three-output type (input 4~20mA, output 1 channel 4~20mA, 2-channel relay), power supply voltage 24V.DC, allowable load RL≤550Ω, electric shock capacity 250VAC / 2A or 30V / 2A, conversion accuracy 0.1%FS, response time ≤500ms.All 15 gas cabinets have four-level alarms, namely low-low alarm, low alarm, high alarm, and high-high alarm. The low alarm and high alarm are pre-alarms realized by the PLC controller 14. The HMI screen displays the cabinet alarm. At the same time, when the cabinet reaches the set threshold, the switch signal sent by the PLC controller 14 is sent to the flash alarm 13, and the first sound and light alarm is issued to remind the operator to pay attention to the operation status of the gas cabinet and conduct manual intervention when appropriate to keep the cabinet running smoothly. The low-low alarm and high-high alarm of the gas cabinet 15 are realized by two relays of the first current detection end safety gate 7, the second current detection end safety gate 8 and the third current detection end safety gate 9. The alarm output terminals (cabinet low-low alarm) and danger alarm output terminals (cabinet high-high alarm) of every two current detection end safety gates are connected in series respectively to realize the "AND" logic judgment between the measurement points of the first radar level meter 1, the second radar level meter 2, the first radar level meter 1, the second radar level meter 3, and the first radar level meter 2, the second radar level meter 3, and the second radar level meter 3, thereby enhancing the system The reliability of the dangerous alarm action is improved, and the number of false alarms is reduced. When the gas tank 15 reaches the low-low alarm and high-high alarm thresholds, a second sound and light alarm is issued, and the interlock action condition is triggered to automatically open the gas release valve or automatically open and close the gas inlet and outlet valves; when the gas tank 15 is restored to the normal position, the gas outlet valve is manually opened to release the alarm and interlock. The input end of the flash alarm 13 is respectively connected to the alarm output channel and the dangerous alarm output channel of the first current detection end safety gate 7, the second current detection end safety gate 8 and the third current detection end safety gate 9, and the other end is respectively connected to the electric bell 10, the test button 11 and the confirmation button 12. When the flash alarm 13 is turned on, the electric bell 10 is also turned on, wherein the flash alarm 13 emits a light source and the electric bell 10 emits a sound to realize the sound and light alarm. When the test button 11 is closed, the flash alarm 13 is turned on, and when the confirmation button 12 is closed, the flash alarm 13 is turned off. The test button 11 and the confirmation button 12 are used to confirm whether the flash alarm 13 works normally. The entire chain operation process effectively improves the safety of the operation of industrial gas cabinets 15, reduces uncertain operation risks, realizes timely prediction of cabinet failures and risks, guides operators to make correct judgments and operations, significantly avoids the occurrence of equipment accidents, and improves the safety and efficiency of gas cabinet 15 operation, thereby improving the overall efficiency of industrial gas cabinet 15 operation. Therefore, the system has good practicality.

Claims

1. An industrial gas tank safe operation warning system, comprising a gas tank (15), wherein a gas tank piston floating top (16) is provided on the inner side of the gas tank (15), wherein: A first radar level meter (1), a second radar level meter (2) and a third radar level meter (3) are fixedly arranged on the inner side of the gas tank (15), and a first radar reflector (4), a second radar reflector (5) and a third radar reflector (6) are matched with the top of the gas tank piston floating top (16) directly facing the first radar level meter (1), the second radar level meter (2) and the third radar level meter (3). The first radar level meter (1), the second radar level meter (2) and the third radar level meter (3) are respectively connected to a first current detection end safety gate (7), a second current detection end safety gate (8) and a third current detection end safety gate (9). The first current detection end safety gate (7), the second current detection end safety gate (8) and the third current detection end safety gate (9) are connected to a flash alarm (13), and the first current detection end safety gate (7), the second current detection end safety gate (8), the third current detection end safety gate (9) and the flash alarm (13) are all connected to a PLC controller (14).

2. The industrial gas tank safe operation warning system according to claim 1 is characterized by: A bracket (17) is fixedly provided horizontally on the inner side of the gas tank (15), and the first radar level meter (1), the second radar level meter (2) and the third radar level meter (3) are all detachably connected to the bracket (17).

3. The industrial gas tank safe operation warning system according to claim 1 is characterized by: The output end of the flash alarm (13) is also connected in parallel with an electric bell (10), a test button (11) and a confirmation button (12).

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