CN215726515U - Anti-fluctuation damping system for measuring micro differential pressure of differential pressure instrument - Google Patents
Anti-fluctuation damping system for measuring micro differential pressure of differential pressure instrument Download PDFInfo
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- CN215726515U CN215726515U CN202121916254.XU CN202121916254U CN215726515U CN 215726515 U CN215726515 U CN 215726515U CN 202121916254 U CN202121916254 U CN 202121916254U CN 215726515 U CN215726515 U CN 215726515U
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Abstract
The utility model relates to an anti-fluctuation damping system for measuring micro differential pressure of a differential pressure instrument, which is used for being connected with a negative pressure chamber of the differential pressure instrument and is characterized in that: including first air-resistor pipe and first air capacity cavity, first air capacity cavity has first gas port and second gas port, the first gas port of first air capacity cavity is for distributing inlet port on the wall of first air capacity cavity, the first end of first air-resistor pipe with differential pressure instrument's negative pressure chamber is linked together, the second end of first air-resistor pipe with the second gas port of first air capacity cavity is connected. The anti-fluctuation damping system can effectively overcome the disturbance influence of the external environment measured by the differential pressure instrument and improve the measurement accuracy of the instrument.
Description
Technical Field
The utility model relates to an anti-fluctuation damping system for measuring micro differential pressure of a differential pressure instrument.
Background
At present, in domestic petrochemical ethylene combined production plants, an ethylene device is a produced faucet device. Cracking furnaces are key equipment in the ethylene production process. At present, the negative pressure measuring instrument of the cracking furnace hearth of the ethylene device of each ultra-large petrochemical enterprise in China is mainly realized by a diaphragm capsule type micro-differential pressure transmitter. Wherein, the design of the differential pressure measuring range is generally 0 to-120.0 Pa, the alarm set value is-10.0 Pa, and the interlock stopping set value is 0.0 Pa. Because the measured differential pressure value is too small, and the negative pressure measurement of the hearth is greatly influenced by the environment, the production fluctuation is often caused by the false fluctuation of a measurement signal generated by the change of the wind speed in the measurement environment. When large wind power changes, the 'false signal' often causes the interlocking stop of the furnace, causes great fluctuation of the ethylene device production, and brings threat to safety production. If the temporary interlocking removal measure is taken to avoid the false car jump, the requirement related to the safety production management is not met, the interlocking protection effect cannot be realized, the safety production is influenced, and a larger potential safety hazard is possibly caused. If the interlock system is always engaged, a furnace "glitch" trip may result, causing large fluctuations in production and large economic losses!
Therefore, in order to solve the problems, the mode of taking three out of two is mostly adopted for interlocking the negative pressure of the hearth at present, although a certain effect is achieved, when strong wind comes, three instruments often fluctuate greatly at the same time, the reason for generating error signals is not fundamentally eliminated, and the safety production of petrochemical production devices is threatened.
Disclosure of Invention
The utility model aims to solve the technical problem of the prior art, and provides an anti-fluctuation damping system for a differential pressure instrument to measure micro differential pressure, which can effectively overcome the disturbance influence of the external environment measured by the differential pressure instrument and improve the measurement stability, reliability and accuracy of the instrument.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a prevent undulant damping system for differential pressure instrument measures little differential pressure for be connected with differential pressure instrument's negative pressure chamber, its characterized in that: including first air-resistor pipe and first air capacity cavity, first air capacity cavity has first gas port and second gas port, the first gas port of first air capacity cavity is for distributing inlet port on the wall of first air capacity cavity, the first end of first air-resistor pipe with differential pressure instrument's negative pressure chamber is linked together, the second end of first air-resistor pipe with the second gas port of first air capacity cavity is connected.
The first air chamber can be of a cylindrical structure, a square structure and the like, in order to avoid the direct impact influence of the air flow, the first air chamber is a vertically arranged cylinder and comprises an annular wall, a top wall arranged on the upper portion of the annular wall and a bottom wall arranged on the lower portion of the annular wall, the second air port is arranged on the top wall of the first air chamber, and the air inlet holes are distributed on the bottom wall of the first air chamber.
In order to avoid the influence of rain and fog weather, the lower end of the annular wall of the first air accommodating chamber is provided with a waterproof blocking edge which extends downwards and is arranged outside the bottom wall in an enclosing mode. When rain and fog weather arrives, the waterproof edge can carry out effectual "drainage" to the rainwater and the dew of instrument bottom, has avoided the water droplet to block up the influence that bottom measurement aperture produced the measurement accuracy of instrument itself.
The height of the waterproof blocking edge is reasonably designed to avoid the problem that the height is too small to play an effective waterproof role, so that the problem that the height is too high to occupy space is avoided, wherein the height of the annular wall of the first air-containing chamber is 50-150mm, and the height of the waterproof blocking edge is 2-8 mm.
In order to overcome the influence of harsher external environment disturbance, further improve instrument measurement accuracy, still include second air-resistor pipe and second air-resistor chamber, the second air-resistor chamber has third gas port and fourth gas port, the third gas port of second air-resistor chamber with the second gas port of first air-resistor pipe links to each other, the second air-resistor union coupling the fourth gas port of second air-resistor chamber with the negative pressure chamber of differential pressure instrument.
In order to prevent the anti-fluctuation damping system from being corroded to influence the accuracy of the measuring result, the first air volume chamber, the second air volume chamber, the first air resistance pipe and the second air resistance pipe are all stainless steel pieces.
For convenience of processing, the first air-containing chamber, the second air-containing chamber, the first air resistance pipe and the second air resistance pipe are integrated. It is certainly conceivable that, in order to facilitate assembly and replacement, the anti-fluctuation damping devices with different specifications are formed so as to cope with the influence of different external environmental conditions, and the first air volume chamber, the second air volume chamber, the first air resistance pipe and the second air resistance pipe are independent separate pieces and are connected by adopting a detachable structure. That is, the shapes and sizes of the first air-capacitor chamber, the second air-capacitor chamber, the first air resistance pipe and the second air resistance pipe can be in various specifications.
In order to ensure the damping effect of the air inlet, the diameter of each air inlet is 2-4 mm. Preferably 3 mm.
Compared with the prior art, the utility model has the advantages that: the anti-fluctuation damping system combines the first air resistance pipe and the first air containing chamber to form a resistance-capacitance combined body structure, achieves an effective damping effect, can effectively filter fluctuation generated by weather change, avoids misoperation of an instrument, ensures accurate measurement of the instrument, and provides guarantee for safe production. Especially, the arrangement of the air inlets distributed on the wall of the first air-containing chamber can realize better preliminary damping effect, the effect of filtering the external disturbance of the measuring instrument is obvious, and the loss caused by interlocking parking due to the misoperation of the instrument is effectively avoided. In the preferred scheme, the second air resistance pipe and the second air volume chamber which are additionally arranged are matched, a structure with three sections of air resistance and two sections of air volumes arranged alternately can be formed in a path from the external environment to the negative pressure chamber of the differential pressure instrument, an effective damping effect can be generated, the disturbance influence of the differential pressure instrument on the external environment can be effectively overcome, and the measurement accuracy of the instrument is greatly improved.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a vertical cross-sectional view of an embodiment of the present invention;
FIG. 3 is a graph showing the trend of the measurement of the negative pressure in the furnace before and after the differential pressure instrument of the embodiment of the utility model is applied to the cracking furnace;
FIG. 4 is a graph showing the negative pressure measurement trend of a furnace chamber after the anti-fluctuation damping system for measuring micro differential pressure by a differential pressure instrument is applied to a No. 1 cracking furnace according to an embodiment of the present invention;
FIG. 5 is a graph showing the trend of the measurement of the negative pressure in the furnace after the anti-fluctuation damping system for measuring the micro differential pressure by the differential pressure meter is applied to the No. 2 cracking furnace;
FIG. 6 is a graph showing the trend of the measurement of the negative pressure in the furnace chamber after the anti-fluctuation damping system for measuring the micro differential pressure by the differential pressure meter is applied to the No. 3 cracking furnace according to the embodiment of the present invention;
FIG. 7 is a graph showing the negative pressure measurement trend of a furnace chamber after the anti-fluctuation damping system for measuring micro differential pressure by a differential pressure meter is applied to a No. 4 cracking furnace according to an embodiment of the present invention;
fig. 8 is a graph showing a trend of measuring negative pressure in a furnace chamber after the differential pressure instrument of the embodiment of the utility model is applied to a No. 5 cracking furnace.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
Referring to fig. 1-8, an anti-fluctuation damping system for differential pressure gauge measuring micro differential pressure is used in connection with a negative pressure chamber of a differential pressure gauge. For example, a micro-differential pressure transmitter is generally installed on a cracking furnace hearth negative pressure measuring instrument of ethylene devices of various domestic ultra-large petrochemical enterprises, and the anti-fluctuation damping system of the embodiment is connected with the micro-differential pressure transmitter.
Referring to fig. 1, the anti-fluctuation damping system for differential pressure instrument to measure micro-differential pressure of the present embodiment includes a first air-resistance tube 10, a first air-receiving chamber 20, a second air-resistance tube 30, and a second air-receiving chamber 40, wherein the tube diameter of the corresponding air-resistance tube is obviously smaller than the inner cavity size of the corresponding air-receiving chamber, and the air-resistance tube can play roles of retarding air pressure change and limiting current. The air-containing chamber can play a role in buffering in the air path and preventing oscillation.
Referring to fig. 2, the first air-receiving chamber 20 and the second air-receiving chamber 40 are sequentially arranged in an up-down direction, wherein the first air-receiving chamber 20 is located below the second air-receiving chamber 40. The first gas chamber 20 has a first gas port 21 and a second gas port 22, and the second gas chamber 40 has a third gas port 41 and a fourth gas port 42. The first air opening 21 of the first air chamber 20 is an air inlet hole 210 distributed on the wall of the first air chamber 20. The first end of the first air resistance pipe 10 is connected with the second air port 22 of the first air chamber 20, the second end of the first air resistance pipe 10 is connected with the third air port 41 of the second air chamber 40, and the second air resistance pipe 30 is connected with the fourth air port 42 of the second air chamber 40 and the negative pressure chamber of the differential pressure instrument. In a path from an external environment to a negative pressure chamber of the differential pressure instrument, the first air cavity chamber 20, the first air resistance pipe 10, the second air cavity chamber 40 and the second air resistance pipe 30 of the embodiment are sequentially connected, so that a structure with three sections of air resistances and two sections of air capacities arranged alternately is formed, an effective damping effect can be generated, the disturbance influence of the external environment measured by the differential pressure instrument can be effectively overcome, and the measurement accuracy of the instrument is greatly improved.
The first air volume chamber, the second air volume chamber, the first air resistance pipe 10 and the second air resistance pipe 30 of the embodiment are all stainless steel pieces so as to ensure the integral strength of the anti-fluctuation damping system device and prevent corrosion to cause damping change of the measuring hole, and the wall thicknesses of the first air volume chamber and the second air volume chamber can be 2-3 mm. More specifically, the first air chamber, the second air chamber, the first air resistance tube 10 and the second air resistance tube 30 are an integral piece.
The first air chamber 20 of the present embodiment is a vertically arranged cylinder, the first air chamber 20 includes an annular wall 23, a top wall 24 disposed on an upper portion of the annular wall 23, and a bottom wall 25 disposed on a lower portion of the annular wall 23, wherein the second air port 22 is disposed on the top wall 24 of the first air chamber 20, and the air inlet holes 210 are distributed on the bottom wall 25 of the first air chamber 20. In particular, the annular wall 23 of the first gas chamber 20 has a height H of 50-150mm, preferably 100 mm. In order to ensure the damping effect of the air inlet, the diameter of each air inlet hole is 2-4mm, preferably 3 mm. The second air chamber 40 of the present embodiment may also be a vertically arranged cylindrical structure.
In order to avoid the influence of rain and fog weather, the lower end of the annular wall 23 of the first air receiving chamber 20 has a downwardly extending water-proof rim 26, the water-proof rim 26 being arranged around the bottom wall 25, in particular the height H1 of the water-proof rim 26 is 2-8mm, preferably 5 mm. When the rain and fog weather comes, the waterproof blocking edge 26 can effectively conduct 'drainage' on the rainwater at the bottom of the instrument, and the influence on the measurement precision of the instrument is avoided.
The anti-fluctuation damping system of the embodiment combines the first air resistance tube 10 and the first air containing chamber 20 to form a resistance-capacitance combined body structure, achieves an effective damping effect, can effectively filter fluctuation generated by weather change, avoids misoperation of an instrument, ensures accurate measurement of the instrument, and provides guarantee for safety production. Particularly, the arrangement of the air inlets 210 distributed on the wall of the first air chamber 20 can realize a better preliminary damping effect, the effect of filtering the external disturbance of the measuring instrument is obvious, and the loss caused by interlocking parking due to the misoperation of the instrument is effectively avoided. In the preferred scheme, the second air resistance pipe 30 and the second air volume chamber 40 which are additionally arranged are matched, a structure with three sections of air resistance and two sections of air volumes arranged alternately can be formed in a path from the external environment to a negative pressure chamber of the differential pressure instrument, effective damping effect can be generated, disturbance influence of the differential pressure instrument on the external environment can be effectively overcome, and the measurement accuracy of the instrument is greatly improved.
Fig. 3 is a graph showing the measurement trend of the negative pressure of the furnace chamber after the differential pressure gauge of the embodiment of the utility model is applied to the cracking furnace, and it can be seen from fig. 3 that the detected negative pressure of the furnace chamber fluctuates greatly (see the left part of the graph) before the anti-fluctuation damping system is applied, and the detected negative pressure of the furnace chamber fluctuates obviously and steadily (see the right part of the graph) after the anti-fluctuation damping system is applied.
The actual operation condition of the anti-fluctuation damping system for the differential pressure instrument to measure the micro differential pressure in the embodiment is described below by combining the actual typhoon weather condition, specifically as follows:
no. 6 typhoon "fireworks" (strong typhoon level) in 2021 lands near the coastal area in North Zhejiang at 7 and 25 months in 2021, the factory area of the applicant enters a 12-level typhoon ring, the maximum wind power is 11-13 levels, and the negative pressure of five cracking furnace hearths in the factory area of the applicant is as follows after an anti-fluctuation damping system is installed:
the No. 2-4 cracking furnaces are in a normal operation state during typhoon, and the monitoring condition of furnace chamber negative pressure measurement trend curves shows that the furnace chamber negative pressure fluctuates slightly when external wind force is maximum (25 days in the morning), wherein the highest furnace chamber negative pressure value of the No. 2 cracking furnace is-2.28 Pa (detailed shown in figure 5), the highest furnace chamber negative pressure value of the No. 3 cracking furnace is-12.2 Pa (detailed shown in figure 6), the highest furnace chamber negative pressure value of the No. 4 cracking furnace is-14.58 Pa (detailed shown in figure 7), and the negative pressures of the three furnace chambers do not reach a high interlocking value of 0 Pa. The No. 5 cracking furnace is in a furnace shutdown state, and the measured value is always at a negative pressure value during the typhoon, and the maximum value is-12.7 Pa (see a detailed figure 8).
From the above recorded curves and analysis results it can be seen that: when the anti-fluctuation damping system is not installed before, especially in a blowing-out state, frequent alarming and interlocking actions can be generated under the influence of daily breeze, and during blowing-in, the negative pressure of a hearth can also frequently give an alarm, even exceeds a measurement range and frequently gives an off-line alarm. After the anti-fluctuation damping system is installed, even under the influence of typhoon weather, the measurement value of the negative pressure of the hearth is still stable. Finally, the cracking furnace No. 1 is located in the north, is closest to the seaside, is also the most susceptible one of the five cracking furnaces to the strong wind, and the measured value of the negative pressure of the hearth is deviated to the negative pressure to reach a low alarm value according to the monitoring result (see figure 4 in detail). The situation can be analyzed by comparing with the situations of other cracking furnaces, the recorded change of the hearth differential pressure value is less likely to be changed due to the influence of the typhoon of the differential pressure gauge, and the possibility of the increase of the hearth negative pressure is greater due to the 'twitching' of the cracking furnace by strong wind, so that the recorded curve reflects the actual change value of the equipment which is influenced by the typhoon. In general, after the anti-fluctuation damping system of the negative pressure differential pressure instrument of the hearth of the cracking furnace is installed and used, the fluctuation of the measured value is obviously reduced, and particularly, the use effect is obvious in typhoon weather or strong wind weather.
Claims (8)
1. The utility model provides a prevent undulant damping system for differential pressure instrument measures little differential pressure for be connected with differential pressure instrument's negative pressure chamber, its characterized in that: including first air-resistor pipe (10) and first air capacity cavity (20), first air capacity cavity (20) have first gas port (21) and second gas port (22), first gas port (21) of first air capacity cavity (20) are for distributing inlet port (210) on the wall of first air capacity cavity (20), the first end of first air-resistor pipe (10) with the negative pressure chamber of differential pressure instrument is linked together, the second end of first air-resistor pipe (10) with second gas port (22) of first air capacity cavity (20) are connected.
2. The anti-surge damping system for differential pressure gauge differential pressure measurement according to claim 1, wherein: first air capacity cavity (20) is the cylinder of vertical setting, and it includes annular wall (23), locates roof (24) on annular wall (23) upper portion and locates diapire (25) of annular wall (23) lower part, second gas port (22) are located on roof (24) of first air capacity cavity (20), inlet port (210) distribute in on diapire (25) of first air capacity cavity (20).
3. The anti-surge damping system for differential pressure gauge differential pressure measurement according to claim 2, wherein: the lower end of the annular wall (23) of the first air-containing chamber (20) is provided with a waterproof retaining edge (26) which extends downwards and is arranged outside the bottom wall (25).
4. The anti-surge damping system for differential pressure gauge differential pressure measurement according to claim 3, wherein: the height of the annular wall (23) of the first air-containing chamber (20) is 50-150mm, and the height of the waterproof barrier edge (26) is 2-8 mm.
5. The anti-fluctuation damping system for differential pressure instrument differential pressure measurement according to any one of claims 1-4, further comprising a second air-resistance tube (30) and a second air-volume chamber (40), the second air-volume chamber (40) having a third air port (41) and a fourth air port (42), the third air port (41) of the second air-volume chamber (40) being connected with the second air port (22) of the first air-resistance tube (10), the second air-resistance tube (30) connecting the fourth air port (42) of the second air-volume chamber (40) with the negative pressure chamber of the differential pressure instrument.
6. The anti-surge damping system for differential pressure gauge differential pressure measurement according to claim 5, wherein: the first air-containing chamber (20), the second air-containing chamber (40), the first air resistance pipe (10) and the second air resistance pipe (30) are all stainless steel pieces.
7. The anti-surge damping system for differential pressure gauge differential pressure measurement according to claim 6, wherein: the first air-containing chamber (20), the second air-containing chamber (40), the first air resistance pipe (10) and the second air resistance pipe (30) are integrated.
8. The anti-surge damping system for differential pressure gauge measurement differential pressure according to any of claims 1-4, wherein: the diameter of each air inlet hole (210) is 2-4 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121916254.XU CN215726515U (en) | 2021-08-16 | 2021-08-16 | Anti-fluctuation damping system for measuring micro differential pressure of differential pressure instrument |
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| CN202121916254.XU CN215726515U (en) | 2021-08-16 | 2021-08-16 | Anti-fluctuation damping system for measuring micro differential pressure of differential pressure instrument |
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