CN116513658A - Floating disc monitoring system and method for floating roof storage tank - Google Patents
Floating disc monitoring system and method for floating roof storage tank Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 76
- 238000003860 storage Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000008859 change Effects 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 33
- 238000005259 measurement Methods 0.000 claims description 32
- 230000002457 bidirectional effect Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 10
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- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
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- 239000002360 explosive Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000005728 strengthening Methods 0.000 description 1
- 239000000341 volatile oil Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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Abstract
The invention provides a floating disc monitoring system and a floating disc monitoring method of a floating roof storage tank. The floating disc inclination angle early warning module is used for calculating the inclination angle of the floating disc and carrying out early warning; the floating disc sinking early warning module is used for judging whether the floating disc sinks or not; and the floating disc gas leakage early warning module is used for judging whether gas leakage occurs on the surface of the floating disc. The invention has the characteristics of high sensitivity, reliable performance and high stability, can reduce the labor intensity of operators, makes a prediction before, makes a decision in the past, and effectively improves the economic benefit and the management level of enterprises.
Description
Technical Field
The invention relates to the technical field of intelligent control of chemical processes, in particular to a floating disc monitoring system and a floating disc monitoring method of a floating roof storage tank.
Background
Compared with other types of storage tanks, the floating roof storage tank has the advantages of low oil loss, large monomer volume, relative environmental protection and the like, and is widely used in refineries and petroleum reservoirs at present. The floating roof tank generally stores crude oil, gasoline, other volatile oil products and other mediums, is a potential serious hazard source, and the safe and stable operation of the floating roof tank is critical to enterprises. Through statistics of reasons of accidents of large floating roof tanks in recent years, a plurality of factors influencing the intrinsic safety of the outer floating tanks are found, but the sinking plate and chuck events caused by the inclination of the floating plate and the explosion event caused by the leakage of volatile gas are two important influencing factors. When the accident of sinking the disc and clamping the disc occurs, the oil loss is caused, a great deal of manpower, material resources and financial resources are consumed for repairing, and if the accident of sinking the disc and clamping the disc occurs, the risk of causing fire and even explosion exists. Therefore, on-line detection of the inclination and leakage of the floating disc is critical to normal and safe operation of the large-sized outer floating tank.
The reason for the tilting of the floating roof tank is mainly the following: first, tilting due to float corrosion. The floating disc runs in the atmosphere environment containing corrosive medium for a long time, and meanwhile, corrosive medium possibly exists in the stored liquid, the environment can seriously corrode the floating disc, so that the floating top of the storage tank leaks, and the floating disc is inclined or even sinks; second, the tank is tilted by deformation. Because the tank foundation is unevenly settled to cause tank body deformation and tank body inclination, the tank body inclination and tank wall deformation can squeeze the floating disc sealing ring, so that the friction force of floating disc operation is increased, the floating disc sealing structure is possibly blocked with the tank wall, the floating disc is inclined, and the floating disc is seriously sunk; third, the floating disc may be tilted during use of the floating roof tank due to improper operation. If the feeding speed of the floating roof storage tank is too high or a large amount of gas is contained in the entering liquid storage, the gas escapes from the sealing ring, carries a large amount of liquid storage and falls on the floating roof, so that the floating disc can tilt and fluctuate to cause the sinking disc. In addition, for the floating roof storage tank for storing volatile media, if the removal of light component gas in the liquid storage is insufficient or the temperature rise is too fast in summer, under the condition that the elasticity of the primary sealing ring and the secondary sealing ring is insufficient, inflammable and explosive gas can leak out of the storage tank, so that the loss of oil products is caused, and if the gas concentration is large, the risk of explosion occurs when the gas is exposed to open fire.
At present, the monitoring measure for the inclination of the floating disc of the large floating roof storage tank is realized by strengthening the field inspection mode. On the one hand, on-site inspection cannot guarantee effective monitoring of the inclination and leakage of the floating disc in a non-inspection time period; on the other hand, in the initial stage of the floating disc tilting, because the diameter of the floating roof storage tank is large, the naked eyes cannot generally find the unsafe tilting state of the floating disc, and cannot find the unsafe tilting state in advance, and measures are taken to prevent further expansion of accidents.
The leakage of combustible gas is generally monitored by means of a fixed-point gas detector, and the following disadvantages exist. On the one hand, when the combustible gas leaks in the field, the fixed-point gas detector cannot accurately detect the specific position of the gas leakage at the first time. Second, the gas detector has long response time, and can respond only when the flammable gas is diffused to a certain concentration, so that the best time for emergency rescue can be missed.
Disclosure of Invention
The invention provides a floating disc monitoring system and a floating disc monitoring method of a floating roof storage tank, which are used for solving the technical problems that the floating disc of the floating roof storage tank is inclined, a floating disc and leakage are difficult to effectively monitor in the prior art.
One aspect of the present invention is to provide a floating disc monitoring system of a floating roof tank, which includes a floating disc state signal acquisition system, a signal transmission system, a floating disc state monitoring system, and a monitoring result output system,
the floating plate state signal acquisition system comprises a floating plate inclination angle measurement module, a floating plate travel measurement module and a floating plate gas leakage measurement module,
the floating disc inclination angle measuring module is used for collecting floating disc inclination change information; the floating disc travel measurement module is used for collecting liquid level change information in the storage tank body; the floating disc gas leakage measurement module is used for collecting gas change information of the surface of the floating disc in real time and collecting image information of the surface of the floating disc in real time;
the floating disc inclination angle measurement module comprises a bidirectional high-precision angle sensor, wherein the bidirectional high-precision angle sensor is arranged at the center position of the top of the floating disc;
the floating disc travel measurement module comprises a plurality of laser ranging sensors and a laser ranging sensor reflecting plate, wherein the laser ranging sensors are arranged around the top edge of the floating disc, and the laser ranging sensor reflecting plate corresponds to the laser ranging sensors and is fixed on the tank body of the storage tank;
the floating disc gas leakage measurement module comprises a scanning type gas laser detection sensor, wherein the scanning type gas laser detection sensor is arranged at the center position of the top of the floating disc;
the float plate state monitoring system comprises a float plate inclination angle early warning module, a float plate sinking plate early warning module and a float plate gas leakage early warning module,
the floating disc inclination angle early warning module is used for calculating the inclination angle of the floating disc and carrying out early warning; the floating disc sinking early warning module is used for judging whether the floating disc is sinking or not; and the floating disc gas leakage early warning module is used for judging whether gas leakage occurs on the surface of the floating disc.
In a preferred embodiment, the floating disc state monitoring system further comprises a floating disc three-dimensional state display module, which is used for visually displaying when the floating disc is inclined;
the floating plate state monitoring system further comprises a floating plate visual monitoring module which is used for receiving the gas leakage information of the floating plate in real time and displaying the image of the surface of the floating plate in real time.
In a preferred embodiment, the disc inclination angle early-warning module calculates the inclination angle of the floating disc by the following method:
taking the center of the floating disc as an origin, taking the upper surface of the floating disc as an xOy plane, and establishing a rectangular coordinate system O-xyz;
setting a bidirectional high-precision angle sensor, so that the x-axis of the bidirectional high-precision angle sensor coincides with the x-axis of the rectangular coordinate system O-xyz, and the y-axis coincides with the y-axis of the rectangular coordinate system O-xyz;
when the floating disc is inclined, the included angle between the x 'oy' plane and the xOy plane is calculated as gamma by the following method:
wherein, alpha and beta are floating disc inclination change information collected by a bidirectional high-precision angle sensor: the angle alpha by which the xOy plane rotates about the x-axis away from the z-axis, the angle beta by which the xOy plane rotates about the y-axis away from the z-axis,
the x 'oy' plane is a plane after the xOy plane is inclined, and the included angle gamma between the x 'oy' plane and the xOy plane is the inclination angle of the floating disc;
the floating disc inclination angle early warning module carries out early warning through the following method:
calculating the settlement of the sinking end of the floating disc: d=0.5d 1 tanγ；
Setting an early warning value h1 of the inclined settlement of the grade I floating disc;
triggering the grade I floating disc inclination angle early warning when the sinking amount d of the sinking end of the floating disc is more than h1;
setting an I-level floating disc inclination settlement early-warning value h2;
triggering the grade I float plate inclination angle early warning when the sinking amount d of the sinking end of the float plate is more than h2;
wherein D is 1 The diameter of the floating disc is shown, and gamma is the inclination angle of the floating disc;
wherein, h1 satisfies: h1 is less than or equal to t 1-delta t 1 Syndrome of deficiency the method comprises the steps of carrying out a first treatment on the surface of the; h2 satisfies h2 is less than or equal to t 1-Deltat 1 ；
Wherein t1 is the height from the top of the floating roof storage tank in the horizontal state of the floating disc, delta t 1 The settlement amount caused by the dead weight of the floating disc and accumulated snow or water is delta which is a safety margin;
in a preferred embodiment, the float is self-weight and the amount of settlement Deltat due to snow or water accumulation 1 Calculated by the following method:
wherein Q is the dead weight of the floating disc and kg; g is a larger value of accumulated rain mass and accumulated snow mass, kg; ρ is the liquid storage density, kg/m3; d (D) 1 Is the diameter of the floating disc.
In a preferred embodiment, the floating disc sinking early warning module judges whether the floating disc is sinking or not by the following method:
and triggering the floating disc sinking disc early warning when the liquid level variation delta 1 of the storage tank caused by the feeding and/or discharging of the floating roof storage tank is unequal to the liquid level variation delta 2 of the storage tank acquired by the floating disc stroke measuring module within a certain time.
In a preferred embodiment, the floating disc gas leakage early warning module judges whether gas leakage occurs on the surface of the floating disc by the following method:
and when the floating disc gas leakage measurement module collects that the gas change on the surface of the floating disc exceeds a preset threshold value, triggering the floating disc gas leakage early warning.
Another aspect of the invention provides a floating disc monitoring method of a floating roof storage tank, which utilizes a floating disc monitoring system to perform floating disc monitoring, wherein the floating disc monitoring method comprises floating disc inclination angle early warning, floating disc sinking early warning and floating disc gas leakage early warning;
the float plate inclination angle early warning method comprises the following steps:
s1, acquiring floating disc inclination change information: an angle α by which the xOy plane rotates about the x-axis away from the z-axis, and an angle β by which the xOy plane rotates about the y-axis away from the z-axis;
s2, calculating an included angle between the x 'oy' plane and the xOy plane as gamma:
wherein the xOy plane is an xOy plane in a rectangular coordinate system O-xyz established by taking the center of the floating disc as an origin and the upper surface of the floating disc as the xOy plane,
the x 'oy' plane is a plane after the xOy plane is inclined, and the included angle gamma between the x 'oy' plane and the xOy plane is the inclination angle of the floating disc;
s3, calculating the settlement of the sinking end of the floating disc: d=0.5d 1 tanγ；
S4, setting an early warning value h1 of the inclined settlement of the grade I floating disc;
triggering the grade I floating disc inclination angle early warning when the sinking amount d of the sinking end of the floating disc is more than h1;
wherein D is 1 The diameter of the floating disc is shown, and gamma is the inclination angle of the floating disc;
wherein, h1 satisfies: h1 is less than or equal to t 1-delta t 1 Syndrome of deficiency the method comprises the steps of carrying out a first treatment on the surface of the; h2 satisfies h2 is less than or equal to t 1-Deltat 1 ；
Wherein t1 is the height from the top of the floating roof storage tank in the horizontal state of the floating disc, delta t 1 The settlement amount caused by the dead weight of the floating disc and accumulated snow or water is delta which is a safety margin;
s5, setting an I-level floating disc inclination settlement early-warning value h2;
when the sinking amount d of the sinking end of the floating disc is more than h2, the inclination angle early warning of the I-stage floating disc is triggered.
In a preferred embodiment, the float is self-weight and snow or waterPrecipitation delta t caused by ponding 1 Calculated by the following method:
wherein Q is the dead weight of the floating disc and kg; g is a larger value of accumulated rain mass and accumulated snow mass, kg; ρ is the liquid storage density, kg/m3; d (D) 1 Is the diameter of the floating disc.
In a preferred embodiment, the float plate sinking early warning is carried out by the following method:
and triggering the floating disc sinking disc early warning when the liquid level change delta 1 of the storage tank caused by the feeding and/or discharging of the floating roof storage tank is unequal to the collected liquid level change delta 2 of the storage tank within a certain time.
In a preferred embodiment, the float plate gas leakage warning is performed by the following method:
when the collected gas change on the surface of the floating disc exceeds a preset threshold value, triggering the floating disc gas leakage early warning.
Compared with the prior art, the invention has the following beneficial effects:
the floating disc monitoring system and the floating disc monitoring method for the floating roof storage tank provided by the invention have the advantages of judging whether the inclination and leakage of the floating disc are safe or not, and in the first aspect, the inclination and leakage occurrence positions of the floating disc can be rapidly and accurately positioned, so that technical guarantee is provided for rush repair; the second aspect displays the inclined state of the floating disc in real time, rapidly and accurately judges the state of the floating disc, and gives an alarm when the state exceeds a set value; in the third aspect, the daily operation process is optimized, such as observing the inclination angle change of the floating disc during liquid storage and discharging operation, and the maximum flow rate during feeding and discharging can be determined and optimized.
According to the floating disc monitoring system and the floating disc monitoring method for the floating roof storage tank, through the floating disc inclination angle measuring module arranged at the top of the floating disc, the floating disc travel measuring module arranged at the edge of the floating disc and the floating disc gas leakage measuring module arranged at the top of the floating disc, real-time and dynamic monitoring and analysis on the inclination of the floating disc and whether the integral sinking condition occurs or not can be realized, the pre-prevention and in-process decision is made, the storage tank management level is improved, and the safe, stable, long and excellent operation of the storage tank is ensured. Meanwhile, the system has the advantages of high sensitivity, reliable performance, high stability and the like.
According to the floating disc monitoring system and the floating disc monitoring method for the floating roof storage tank, on the basis of comprehensively analyzing main influence factors of the inclination of the floating disc and the gas leakage, a pre-judging method and an early warning value mechanism are respectively provided for unsafe states of the inclined floating disc, the sinking disc and the gas leakage, and safety evaluation is periodically carried out on the running states of the floating disc aiming at online intelligent monitoring of the unsafe states of the inclined floating disc, the sinking disc and the gas leakage. The invention has the characteristics of high sensitivity, reliable performance and high stability, can reduce the labor intensity of operators, makes a prediction before, makes a decision in the past, and effectively improves the economic benefit and the management level of enterprises.
The floating disc monitoring system and the floating disc monitoring method for the floating roof storage tank provide a safe and effective monitoring mode for monitoring the inclination and leakage of the floating disc of the large-scale floating roof storage tank.
According to the floating disc monitoring system and the floating disc monitoring method for the floating roof storage tank, on the basis of comprehensively analyzing main influence factors of the inclination and leakage of the floating disc, a pre-judging method and an early warning value mechanism are respectively provided for unsafe states such as the inclination and the sinking of the floating disc, and an efficient online intelligent monitoring system aiming at the unsafe states such as the inclination, the sinking of the floating disc and the leakage is established to evaluate the running state of the floating disc.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a floating disc monitoring system for a floating roof tank according to the present invention.
FIG. 2 is a schematic diagram of a float-plate state signal acquisition system deployment sensor of a float-plate monitoring system of a float-top storage tank of the present invention.
Detailed Description
To further clarify the above and other features and advantages of the present invention, a further description of the invention will be rendered by reference to the appended drawings. It should be understood that the specific embodiments presented herein are for purposes of explanation to those skilled in the art and are intended to be illustrative only and not limiting.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In order to solve the technical problems that the floating disc of the floating roof storage tank is inclined, the floating disc is sunk and leakage is difficult to effectively monitor in the prior art, the invention provides a floating disc monitoring system of the floating roof storage tank, which is shown in a structural block diagram of the floating disc monitoring system of the floating roof storage tank in fig. 1. In the examples, the sample is 50000m 3 A crude oil floating roof tank is exemplified.
According to an embodiment of the present invention, there is provided a floating disc monitoring system for a floating roof tank, including a floating disc status signal acquisition system 100, a signal transmission system 200, a floating disc status monitoring system 300, and a monitoring result output system 400.
The float plate state signal acquisition system 100 comprises a float plate inclination angle measurement module 101, a float plate travel measurement module 102 and a float plate gas leakage measurement module 103.
The floating disc inclination angle measuring module 101 is used for collecting floating disc inclination change information in real time. The floating disc travel measurement module 102 is used for collecting liquid level change information in the tank body of the storage tank. The floating disc gas leakage measurement module 103 is used for collecting gas change information of the surface of the floating disc and collecting image information of the surface of the floating disc in real time.
A schematic diagram of a float-plate state signal acquisition system of a float-top tank float-plate state signal acquisition system of the present invention as shown in fig. 2 is provided with sensors, and a float-plate inclination angle measurement module 101, a float-plate travel measurement module 102 and a float-plate gas leakage measurement module 103 according to an embodiment of the present invention include a plurality of sensors, through which relevant information of a float plate is acquired.
Specifically, a tank (floating roof tank) 1 mounts a floating disc 3 through a guide strut 2. The float inclination measuring module 101 comprises a bi-directional high-precision angle sensor 4. The bidirectional high-precision angle sensor 4 is arranged at the center position of the top of the floating disc 3. The bidirectional high-precision angle sensor 4 is set in the coordinate direction before being installed, the positive east is taken as the x axis, the positive north is taken as the y axis, and the center of the top of the floating disc 3 is taken as the origin of coordinates.
The float-plate travel measuring module 102 includes a plurality of laser ranging sensors 7 arranged around the top edge of the float-plate 3, and a laser ranging sensor reflecting plate 8 corresponding to the plurality of laser ranging sensors 7, the laser ranging sensor reflecting plate 8 being fixed on the tank body of the storage tank 1. In a preferred embodiment, the laser ranging sensor reflecting plate 8 is located directly above the laser ranging sensor 7.
The floating disc gas leakage measurement module 103 includes a scanning type gas laser detection sensor 5, and the scanning type gas laser detection sensor 5 is disposed at a central position of the top of the floating disc 3. In a specific embodiment, the bidirectional high-precision angle sensor 4 and the scanning type gas laser detection sensor 5 are installed at the center position of the top of the floating disc 3 through a bracket 6.
In one embodiment, 1 bidirectional high-precision angle sensor 4 is arranged, 1 scanning type gas laser detection sensor 5 is arranged, 6-8 laser ranging sensors 7 are arranged, and the measuring precision of the laser ranging sensors 7 is +/-1 mm. The scanning type gas laser detection sensor 5 can perform 360-degree continuous rotation scanning.
In one embodiment, the bi-directional high precision angle sensor 4, the scanning gas laser detection sensor 5, and the laser ranging sensor 7 are all packaged within a protective box.
In one embodiment, the bi-directional high precision angle sensor 4, the scanning gas laser detection sensor 5, and the laser ranging sensor 7 use explosion protection.
According to an embodiment of the invention, the float plate state monitoring system 300 comprises a float plate three-dimensional state display module 301, a float plate inclination angle early-warning module 302, a float plate sinking early-warning module 303, a float plate gas leakage early-warning module 304 and a float plate visual monitoring module 305.
The float inclination angle early warning module 302 is used for calculating the inclination angle of the float 3 and carrying out early warning. The floating disc sinking early warning module 303 is configured to determine whether the floating disc 3 is sinking. The floating disc gas leakage early warning module 307 is configured to determine whether gas leakage occurs on the surface of the floating disc. The floating disc three-dimensional state display module 301 is configured to visually display when the floating disc 3 is tilted. The float plate visual monitoring module 305 is configured to receive the information of gas leakage of the float plate 3 in real time, and display an image of the surface of the float plate 3 in real time.
According to an embodiment of the present invention, the monitoring result output system 400 includes a PC side or WEB401 and a mobile side APP402. The floating plate state signal acquisition system 100 acquires related information of the floating plate 3, transmits the information to the floating plate state monitoring system 300 through the signal transmission system 200, analyzes and pre-warns the inclination, sinking and gas leakage of the floating plate 3, generates a pre-warning report, and outputs the pre-warning report to the PC end or the WEB401 and/or the mobile end APP402 through the monitoring result output system 400.
According to an embodiment of the present invention, the disc inclination angle early warning module 302 embeds a calculation program to calculate the inclination angle of the floating disc 3 by:
and (3) taking the center of the floating disc 3 as an origin, taking the upper surface of the floating disc 3 as an xOy plane, and establishing a rectangular coordinate system O-xyz.
The bidirectional high-precision angle sensor 4 of the floating disc inclination angle measurement module 101 is arranged, so that the x-axis of the bidirectional high-precision angle sensor 4 is overlapped with the x-axis of the rectangular coordinate system O-xyz, and the y-axis is overlapped with the y-axis of the rectangular coordinate system O-xyz.
When the floating disc 3 is inclined, the included angle between the x 'oy' plane and the xOy plane is calculated as gamma by the following method:
wherein, alpha and beta are floating disc inclination change information collected by the bidirectional high-precision angle sensor 4: the xOy plane is rotated about the x-axis by an angle α, away from the z-axis, and the xOy plane is rotated about the y-axis by an angle β, away from the z-axis.
The x 'oy' plane is a plane after the xOy plane is inclined, and the included angle gamma between the x 'oy' plane and the xOy plane is the inclination angle of the floating disc 3.
The float inclination angle early warning module 302 performs early warning by the following method:
calculating the sinking amount of the sinking end of the floating disc 3: d=0.5d 1 tanγ。
And setting an early warning value h1 of the inclined settlement of the grade I floating disc.
When the sinking amount d of the sinking end of the floating disc is more than h1, the inclination angle early warning of the I-stage floating disc is triggered.
And setting an I-level floating disc inclination settlement early-warning value h2.
When the sinking amount d of the sinking end of the floating disc is more than h2, the inclination angle early warning of the I-stage floating disc is triggered.
Wherein D is 1 The diameter of the floating disc is gamma, and the inclination angle of the floating disc is formed.
Wherein, h1 satisfies: h1 is less than or equal to t 1-delta t 1 Syndrome of deficiency the method comprises the steps of carrying out a first treatment on the surface of the; h2 satisfies h2 is less than or equal to t 1-Deltat 1 。
Wherein t1 is the height from the top of the floating roof storage tank in the horizontal state of the floating disc 3, delta t 1 Is the dead weight of the floating disc and the settlement caused by snow or water accumulation, and delta is a safety margin. The dead weight of the floating disc and the settlement quantity delta t caused by snow or water accumulation 1 Calculated by the following method:
wherein Q is the dead weight of the floating disc and kg; g is a larger value of accumulated rain mass and accumulated snow mass, kg; ρ is the liquid storage density, kg/m3; d (D) 1 Is the diameter of the floating disc.
According to the invention, the floating disc inclination angle early warning module 302 is used for acquiring the floating disc inclination change information acquired by the bidirectional high-precision angle sensor 4 of the floating disc inclination angle measuring module 101, the vector theory is adopted, the inclination angle (the included angle gamma between the x 'oy' plane and the xOy plane is the real-time maximum inclination amount of the floating disc 3) of the floating disc 3 is calculated through the inclination angle change (the angle alpha of the xOy plane rotating around the x axis and the angle beta of the xOy plane rotating around the y axis) of the floating disc 3 in two directions, wherein the I-stage floating disc inclination settlement amount early warning value h1 is used as the floating disc inclination angle early warning, and the I-stage floating disc inclination settlement amount early warning value h2 is used as the early warning about to accelerate inclination.
In some preferred embodiments, when the grade I floating disc inclination angle early warning occurs, a cutting-in and discharging operation needs to be stopped immediately, and hidden danger is checked immediately. When the grade I float plate inclination angle early warning occurs, emergency discharging and tank cleaning operation should be immediately carried out.
In some preferred embodiments, after the floating disc 3 tilts and triggers the stage i floating disc inclination angle early warning, the time interval Δt when the floating disc reaches the stage i floating disc inclination angle early warning state is calculated according to the current tilting rate of the floating disc 3, so as to provide technical support for subsequent rush repair and hidden danger elimination.
According to an embodiment of the invention, for 50000m 3 Diameter D of floating disc of crude oil floating roof storage tank 1 The height of the floating disc 3 from the top of the floating roof tank in the horizontal state is t1=950 mm, the dead weight Q of the floating disc is=350000 kg, and the liquid storage density ρ is=700 kg/m3.
Calculated mass of accumulated rain and larger mass of accumulated snow delta t 1 =395 mm, i stage float inclination settlement early warning value h1=t1- Δt 1 - (=950-395-200=355 mm, i stage float inclination settlement early warning value h2=t1- Δt 1 ＝950-395＝555mm。
According to an embodiment of the present invention, when the liquid level in the tank 1 reaches the maximum liquid level of the tank 1, the position of the laser ranging sensor 7 is set to 0 point. When the floating roof tank is fed and discharged, the floating disc 3 sinks (sinking disc) due to corrosion or excessive surface area liquid. The floating disc sinking early warning module 303 judges whether the floating disc 3 sinks according to the following method:
and triggering the floating disc sinking disc early warning when the liquid level variation delta 1 of the storage tank caused by the feeding and/or discharging of the floating roof storage tank is not equal to the liquid level variation delta 2 of the storage tank acquired by the floating disc travel measurement module within a certain time (delta 1 is not equal to delta 2).
When delta 1 is not equal to delta 2, the floating disc 3 is sinking, the emergency plan is started immediately, and hidden danger of the floating disc is checked and eliminated.
When Δ1= Δ2, then the float 3 is in a safe state.
According to the invention, the floating disc sinking early warning module 303 is used for acquiring the liquid level change information in the tank body of the storage tank 1 through the plurality of laser ranging sensors 7 of the floating disc stroke measuring module 102, and the possibility of sinking of the floating disc 3 is pre-judged.
According to the embodiment of the invention, the floating disc gas leakage early warning module 304 judges whether gas leakage occurs on the surface of the floating disc by the following method:
when the floating disc gas leakage measurement module 103 collects that the gas change of the surface of the floating disc exceeds a preset threshold value, the floating disc gas leakage early warning is triggered.
According to the embodiment of the invention, through the floating disc gas leakage early warning module 304, the gas change information of the surface of the floating disc, which is acquired by the scanning type gas laser detection sensor 5 of the floating disc gas leakage measuring module 103, is acquired, and compared with the preset threshold value, and the risk of gas leakage of the floating disc 3 is judged.
For example, when the float plate gas leakage pre-warning module 304 monitors that the concentration of the combustible gas on the surface of the float plate collected by the scanning type gas laser detection sensor 5 of the float plate gas leakage measurement module 103 exceeds a preset threshold, the float plate gas leakage pre-warning is triggered.
According to the embodiment of the invention, the floating disc three-dimensional state display module 301 performs three-dimensional modeling on the position state of the floating disc 3 according to the inclination angle gamma of the floating disc 3 calculated by the floating disc inclination angle early warning module 302, and visually displays the real-time state of the floating disc 3 through the three-dimensional model.
In one embodiment, the plurality of laser ranging sensors 7 of the float travel measurement module 102 transmit the position change (difference between Δ2 and Δ1) of the float 3 relative to the tank 1, which occurs with the liquid level change, to the float three-dimensional state display module 301, which displays the position of the float 3.
According to an embodiment of the present invention, the float plate visualization monitoring module 305 is configured to receive the information of gas leakage of the float plate 3 in real time and display an image of the surface of the float plate 3 in real time.
For example, in one embodiment, the float visualization monitoring module 305 receives float gas leakage warning information sent by the float gas leakage warning module 304.
In another embodiment, the float plate visual monitoring module 305 receives the image information sent back by the scanning type gas laser detection sensor 5 of the float plate gas leakage measuring module 103 in real time, so that 24-hour all-weather monitoring is realized, a worker directly observes the condition of the float plate 3 through the image, and the labor intensity of the worker in-situ inspection is reduced.
In one embodiment, the float-plate state monitoring system 300 monitors the float plate 3 in real time and generates an early warning report including state data of the float plate 3 (change in position of the float plate 3 relative to the tank 1 with change in liquid level, inclination angle γ of the plate 3, and sinking amount d of the sinking end of the float plate 3).
When the floating disc 3 tilts and triggers the grade I floating disc inclination angle early warning, the early warning report also provides a time interval DeltaT when the floating disc 3 reaches the grade I floating disc inclination angle early warning state.
The early warning report also comprises a floating disc sinking monitoring report, when the floating disc is sinking, the current sinking amount and the current sinking speed of the floating disc 3 are provided, and the sinking time of the floating disc 3 is pre-judged.
The early warning report also comprises a gas monitoring report, and when gas leaks, the information such as specific position coordinates of the gas leakage, leakage time and the like is provided.
The early warning report is output to a PC end or WEB401 and/or a mobile end APP402 through the monitoring result output system 400 and is sent to the target crowd.
According to the embodiment of the invention, a floating disc monitoring method of a floating roof storage tank is provided, and the floating disc monitoring system of the floating roof storage tank is utilized for floating disc monitoring, and comprises floating disc inclination angle early warning, floating disc sinking early warning and floating disc gas leakage early warning.
The float plate inclination angle early warning method comprises the following steps:
step S1, obtaining floating disc inclination change information: the xOy plane is rotated about the x-axis by an angle α, away from the z-axis, and the xOy plane is rotated about the y-axis by an angle β, away from the z-axis.
S2, calculating an included angle between the x 'oy' plane and the xOy plane as gamma:
the xOy plane is an xOy plane in a rectangular coordinate system O-xyz established by taking the center of the floating disc as an origin and the upper surface of the floating disc as the xOy plane.
The x 'oy' plane is a plane after the xOy plane is inclined, and the included angle gamma between the x 'oy' plane and the xOy plane is the inclination angle of the floating disc.
Step S3, calculating the settlement of the sinking end of the floating disc: d=0.5d 1 tanγ。
And S4, setting an early warning value h1 of the inclination settlement of the grade I floating disc.
When the sinking amount d of the sinking end of the floating disc is more than h1, the inclination angle early warning of the I-stage floating disc is triggered.
Wherein D is 1 The diameter of the floating disc is gamma, and the inclination angle of the floating disc is formed.
Wherein, h1 satisfies: h1 is less than or equal to t 1-delta t 1 Syndrome of deficiency the method comprises the steps of carrying out a first treatment on the surface of the; h2 is less than or equal to h2t1-△t 1 。
Wherein t1 is the height from the top of the floating roof storage tank in the horizontal state of the floating disc, delta t 1 Is the dead weight of the floating disc and the settlement caused by snow or water accumulation, and delta is a safety margin. The dead weight of the floating disc and the settlement quantity delta t caused by snow or water accumulation 1 Calculated by the following method:
wherein Q is the dead weight of the floating disc and kg; g is a larger value of accumulated rain mass and accumulated snow mass, kg; ρ is the liquid storage density, kg/m3; d (D) 1 Is the diameter of the floating disc.
And S5, setting an I-stage floating disc inclination settlement pre-warning value h2.
When the sinking amount d of the sinking end of the floating disc is more than h2, the inclination angle early warning of the I-stage floating disc is triggered.
According to the embodiment of the invention, the floating disc sinking early warning is carried out by the following method:
and triggering the floating disc sinking disc early warning when the liquid level change delta 1 of the storage tank caused by the feeding and/or discharging of the floating roof storage tank is unequal to the collected liquid level change delta 2 of the storage tank within a certain time.
According to the embodiment of the invention, the floating disc gas leakage early warning is carried out by the following method:
when the collected gas change on the surface of the floating disc 3 exceeds a preset threshold value, triggering the floating disc gas leakage early warning.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A floating disc monitoring system of a floating roof storage tank is characterized by comprising a floating disc state signal acquisition system, a signal transmission system, a floating disc state monitoring system and a monitoring result output system,
the floating plate state signal acquisition system comprises a floating plate inclination angle measurement module, a floating plate travel measurement module and a floating plate gas leakage measurement module,
the floating disc inclination angle measuring module is used for collecting floating disc inclination change information; the floating disc travel measurement module is used for collecting liquid level change information in the storage tank body; the floating disc gas leakage measurement module is used for collecting gas change information of the surface of the floating disc in real time and collecting image information of the surface of the floating disc in real time;
the floating disc inclination angle measurement module comprises a bidirectional high-precision angle sensor, wherein the bidirectional high-precision angle sensor is arranged at the center position of the top of the floating disc;
the floating disc travel measurement module comprises a plurality of laser ranging sensors and a laser ranging sensor reflecting plate, wherein the laser ranging sensors are arranged around the top edge of the floating disc, and the laser ranging sensor reflecting plate corresponds to the laser ranging sensors and is fixed on the tank body of the storage tank;
the floating disc gas leakage measurement module comprises a scanning type gas laser detection sensor, wherein the scanning type gas laser detection sensor is arranged at the center position of the top of the floating disc;
the float plate state monitoring system comprises a float plate inclination angle early warning module, a float plate sinking plate early warning module and a float plate gas leakage early warning module,
the floating disc inclination angle early warning module is used for calculating the inclination angle of the floating disc and carrying out early warning; the floating disc sinking early warning module is used for judging whether the floating disc is sinking or not; and the floating disc gas leakage early warning module is used for judging whether gas leakage occurs on the surface of the floating disc.
2. The floating disc monitoring system according to claim 1, further comprising a floating disc three-dimensional status display module for visually displaying when the floating disc is tilted;
the floating plate state monitoring system further comprises a floating plate visual monitoring module which is used for receiving the gas leakage information of the floating plate in real time and displaying the image of the surface of the floating plate in real time.
3. The float monitoring system of claim 1, wherein the float inclination warning module calculates the inclination of the float by:
taking the center of the floating disc as an origin, taking the upper surface of the floating disc as an xOy plane, and establishing a rectangular coordinate system O-xyz;
setting a bidirectional high-precision angle sensor, so that the x-axis of the bidirectional high-precision angle sensor coincides with the x-axis of the rectangular coordinate system O-xyz, and the y-axis coincides with the y-axis of the rectangular coordinate system O-xyz;
when the floating disc is inclined, the included angle between the x 'oy' plane and the xOy plane is calculated as gamma by the following method:
wherein, alpha and beta are floating disc inclination change information collected by a bidirectional high-precision angle sensor: the angle alpha by which the xOy plane rotates about the x-axis away from the z-axis, the angle beta by which the xOy plane rotates about the y-axis away from the z-axis,
the x 'oy' plane is a plane after the xOy plane is inclined, and the included angle gamma between the x 'oy' plane and the xOy plane is the inclination angle of the floating disc;
the floating disc inclination angle early warning module carries out early warning through the following method:
calculating the settlement of the sinking end of the floating disc: d=0.5d 1 tanγ；
Setting an early warning value h1 of the inclined settlement of the grade I floating disc;
triggering the grade I floating disc inclination angle early warning when the sinking amount d of the sinking end of the floating disc is more than h1;
setting an I-level floating disc inclination settlement early-warning value h2;
triggering the grade I float plate inclination angle early warning when the sinking amount d of the sinking end of the float plate is more than h2;
wherein D is 1 The diameter of the floating disc is shown, and gamma is the inclination angle of the floating disc;
wherein, h1 satisfies: h1 is less than or equal to t1-t 1 Syndrome of deficiency the method comprises the steps of carrying out a first treatment on the surface of the; h2 satisfies h2 is less than or equal to t 1-Deltat 1 ；
Wherein t1 is the height from the top of the floating roof storage tank in the horizontal state of the floating disc, delta t 1 Is the dead weight of the floating disc and the settlement caused by snow or water accumulation, and delta is a safety margin.
4. A float monitoring system according to claim 3, wherein the float is self-weight and the amount of settlement Δt caused by snow or water accumulation 1 Calculated by the following method:
wherein Q is the dead weight of the floating disc and kg; g is a larger value of accumulated rain mass and accumulated snow mass, kg; ρ is the liquid storage density, kg/m3; d (D) 1 Is the diameter of the floating disc.
5. The floating disc monitoring system according to claim 1, wherein the floating disc sinking pre-warning module judges whether the floating disc is sinking or not by the following method:
and triggering the floating disc sinking disc early warning when the liquid level variation delta 1 of the storage tank caused by the feeding and/or discharging of the floating roof storage tank is unequal to the liquid level variation delta 2 of the storage tank acquired by the floating disc stroke measuring module within a certain time.
6. The floating disc monitoring system according to claim 1, wherein the floating disc gas leakage early warning module judges whether gas leakage occurs on the surface of the floating disc by the following method:
and when the floating disc gas leakage measurement module collects that the gas change on the surface of the floating disc exceeds a preset threshold value, triggering the floating disc gas leakage early warning.
7. A floating disc monitoring method of a floating roof storage tank, characterized in that the floating disc monitoring system of any one of claims 1 to 6 is utilized for floating disc monitoring, and the floating disc monitoring method comprises floating disc inclination angle early warning, floating disc sinking early warning and floating disc gas leakage early warning;
the float plate inclination angle early warning method comprises the following steps:
s1, acquiring floating disc inclination change information: an angle α by which the xOy plane rotates about the x-axis away from the z-axis, and an angle β by which the xOy plane rotates about the y-axis away from the z-axis;
s2, calculating an included angle between the x 'oy' plane and the xOy plane as gamma:
wherein the xOy plane is an xOy plane in a rectangular coordinate system O-xyz established by taking the center of the floating disc as an origin and the upper surface of the floating disc as the xOy plane,
the x 'oy' plane is a plane after the xOy plane is inclined, and the included angle gamma between the x 'oy' plane and the xOy plane is the inclination angle of the floating disc;
s3, calculating the settlement of the sinking end of the floating disc: d=0.5d 1 tanγ；
S4, setting an early warning value h1 of the inclined settlement of the grade I floating disc;
triggering the grade I floating disc inclination angle early warning when the sinking amount d of the sinking end of the floating disc is more than h1;
wherein D is 1 The diameter of the floating disc is shown, and gamma is the inclination angle of the floating disc;
wherein, h1 satisfies: h1 is less than or equal to t 1-delta t 1 Syndrome of deficiency the method comprises the steps of carrying out a first treatment on the surface of the; h2 satisfies h2 is less than or equal to t 1-Deltat 1 ；
Wherein t1 is the height from the top of the floating roof storage tank in the horizontal state of the floating disc, delta t 1 The settlement amount caused by the dead weight of the floating disc and accumulated snow or water is delta which is a safety margin;
s5, setting an I-level floating disc inclination settlement early-warning value h2;
when the sinking amount d of the sinking end of the floating disc is more than h2, the inclination angle early warning of the I-stage floating disc is triggered.
8. The method of claim 7, wherein the float is self-weight and the amount of settlement Δt is caused by snow or water accumulation 1 Calculated by the following method:
wherein Q is the dead weight of the floating disc and kg; g is a larger value of accumulated rain mass and accumulated snow mass, kg; ρ is the liquid storage density, kg/m3; d (D) 1 Is the diameter of the floating disc.
9. The method for monitoring a floating disc according to claim 7, wherein the floating disc sinking pre-warning is performed by the following method:
and triggering the floating disc sinking disc early warning when the liquid level change delta 1 of the storage tank caused by the feeding and/or discharging of the floating roof storage tank is unequal to the collected liquid level change delta 2 of the storage tank within a certain time.
10. The method of claim 7, wherein the float plate gas leakage warning is performed by:
when the collected gas change on the surface of the floating disc exceeds a preset threshold value, triggering the floating disc gas leakage early warning.
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