External floating roof state monitoring method and device of storage tank and electronic equipment

Abstract

The application provides a kind of outer floating roof state monitoring method, device and electronic equipment of storage tank, including by being arranged at least two first liquid level meters, at least one second liquid level meter in tank top, first distance from tank bottom to oil surface, second distance from tank top to outer floating roof is measured respectively;Through at least one third liquid level meter arranged in outer floating roof, the third distance from the oil surface in the storage tank to the outer floating roof is measured;First distance, second distance, third distance are sent to host computer, and the calculation result is output by state monitor mathematical model, and the state of the outer floating roof of storage tank is determined.The way, for in-service or newly-built outer floating roof storage tank, at least one second liquid level meter with communication module can be set on the tank top, at least one third liquid level meter with communication module is set on the outer floating roof, then the state of the outer floating roof is monitored through state monitor mathematical model and related algorithm, so as to reduce the construction difficulty, reduce the capital investment, improve the economy and rationality of outer floating roof state monitoring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil storage and transportation safety in the petrochemical industry, and in particular to a method and device for monitoring the state of an outer floating roof of a storage tank and an electronic device. BACKGROUND

[0002] The outer floating roof is a very sealed and important component of the storage tank, which covers the oil surface and floats with the oil. Real-time monitoring of the state of the outer floating roof is related to the safety of the storage tank and the daily management of production. For newly built outer floating roof storage tanks, the commonly used method for monitoring the state of the outer floating roof mostly requires the installation of a specific online monitoring system on the storage tank. Through different displacement and inclination position sensors, the control system in the control room is conducted through optical fiber transmission to conduct daily monitoring and maintenance of the outer floating roof of the storage tank. The maintenance cost of the online monitoring system and monitoring equipment is not cheap. For the existing outer floating roof storage tanks, the reconstruction of the online floating plate state monitoring system has large engineering quantity and certain construction difficulty. Therefore, a more convenient and economical outer floating roof tank floating plate state monitoring scheme has certain market value and meets the needs of tank area safety protection. SUMMARY

[0003] The present application relates to the technical field of oil storage and transportation safety in the petrochemical industry, and in particular to a method and device for monitoring the state of an outer floating roof of a storage tank and an electronic device.

[0004] The present application provides a method for monitoring the state of an outer floating roof of a storage tank, which comprises:

[0005] Measuring a first distance from the tank bottom to the oil surface at the current time point through at least two first liquid level meters arranged on the tank top;

[0006] Measuring a second distance from the tank top to the outer floating roof at the current time point through at least one second liquid level meter arranged on the tank top;

[0007] Measuring a third distance from the oil surface in the storage tank to the outer floating roof at the current time point through at least one third liquid level meter arranged on the outer floating roof; wherein each first liquid level meter, each second liquid level meter and each third liquid level meter each comprises a communication module in communication connection with an upper computer;

[0008] Sending the first distance, the second distance and the third distance to the upper computer through the plurality of communication modules, and outputting a calculation result through a state monitor mathematical model pre-set in the upper computer;

[0009] Determining the state of the outer floating roof of the storage tank at the current time point based on the first distance, the second distance, the third distance and the calculation result.

[0010] Further, the state monitor mathematical model is represented by the following formula:

[0011] H(t) = d1(t) + d2(t) + d3(t) + φH(t); wherein, H(t) is the calculated height of the storage tank corresponding to time t; d1(t) is the second distance corresponding to time t; d2(t) is the third distance corresponding to time t; d3(t) is the first distance corresponding to time t; and φH(t) is the error compensation of the calculated height of the storage tank corresponding to time t.

[0012] Further, the calculation result is the calculated height of the storage tank corresponding to the current time point; and based on the first distance, the second distance, the third distance and the calculation result, the step of determining the state of the outer floating roof of the storage tank at the current time point comprises:

[0013] if the calculated height of the storage tank corresponding to the current time point is equal to the standard height of the storage tank, the third distance is equal to zero, and the first distance is not greater than the preset lowest liquid level height, outputting a first alarm information through the upper computer; wherein, the first alarm information is used to indicate that the outer floating roof is in a sinking state;

[0014] if the calculated height of the storage tank corresponding to the current time point is equal to the standard height of the storage tank, the third distance is equal to zero, and the first distance is not less than the preset highest liquid level height, outputting a second alarm information through the upper computer; wherein, the second alarm information is used to indicate that the outer floating roof is in a lifted state;

[0015] if the calculated height of the storage tank corresponding to the current time point is not equal to the standard height of the storage tank, and the third distance is not equal to zero, outputting a third alarm information through the upper computer; wherein, the third alarm information is used to indicate that the outer floating roof is in a blocked state or an oil seepage state.

[0016] Further, the mathematical model of the state monitor is also represented by the following formula:

[0017] V(t) = D(dm(tn-t0)); wherein, t = t0, t1, …, tn are the measured time points; D(dm(tn-t0)) is the differential of the outer floating roof height or the oil surface height with respect to time; when m is 1, V(t) is the rising speed or the falling speed of the outer floating roof; and when m is 3, V(t) is the rising speed or the falling speed of the oil surface.

[0018] Further, the calculation result is the rising speed or the falling speed of the outer floating roof corresponding to the current time point, and the rising speed or the falling speed of the oil surface corresponding to the current time point; and based on the first distance, the second distance, the third distance and the calculation result, the step of determining the state of the outer floating roof of the storage tank at the current time point comprises:

[0019] A first ratio result is obtained by calculating a ratio of a first speed of the outer floating roof to a second speed of the oil surface at the current time point, wherein the first speed is the rising speed or the falling speed of the outer floating roof, and the second speed is the rising speed or the falling speed of the oil surface.

[0020] If the first ratio result is equal to the preset constant, a fourth alarm information is output through the upper computer, wherein the fourth alarm information is used to indicate that the outer floating roof is in a normal state.

[0021] If the first ratio result is not equal to the preset constant, a fifth alarm information is output through the upper computer, wherein the fifth alarm information is used to indicate that the outer floating roof is in a jamming state or an oil seepage state.

[0022] Further, the method further comprises: based on V(t), optimizing φH(t) by using a preset algorithm to obtain an optimal value, wherein the preset algorithm comprises at least one of the following: an iterative algorithm, an adaptive algorithm and a deep learning algorithm.

[0023] Further, each first liquid level meter is a radar liquid level meter, a servo liquid level meter or a magnetostrictive liquid level meter, and each second liquid level meter and each third liquid level meter is a radar liquid level meter.

[0024] The application provides an outer floating roof state monitoring device for a storage tank.

[0025] The first measuring module is configured to measure a first distance from the tank bottom to the oil surface at the current time point by using the at least two first liquid level meters arranged on the tank top.

[0026] The second measuring module is configured to measure a second distance from the tank top to the outer floating roof at the current time point by using the at least one second liquid level meter arranged on the tank top.

[0027] The third measuring module is configured to measure a third distance from the oil surface in the storage tank to the outer floating roof at the current time point by using the at least one third liquid level meter arranged on the outer floating roof, wherein each first liquid level meter, each second liquid level meter and each third liquid level meter comprises a communication module in communication connection with the upper computer.

[0028] The sending module is configured to send the first distance, the second distance and the third distance to the upper computer through the plurality of communication modules, and output a calculation result by using a state monitor mathematical model prearranged in the upper computer.

[0029] The determining module is configured to determine the outer floating roof state of the storage tank at the current time point based on the first distance, the second distance, the third distance and the calculation result.

[0030] The electronic device provided by the application comprises a memory and a processor, the memory stores a computer program which can run on the processor, and the processor implements the steps of the method of any one of the above when executing the computer program.

[0031] The computer readable storage medium provided by the application stores a computer program, and the computer program runs on the processor to execute the steps of the method of any one of the above.

[0032] The application provides a method and device for monitoring the state of an external floating roof of a storage tank and an electronic device, comprising measuring a first distance from the tank bottom to the oil surface, a second distance from the tank top to the external floating roof by at least two first liquid level meters and at least one second liquid level meter arranged on the tank top; measuring a third distance from the oil surface in the storage tank to the external floating roof by at least one third liquid level meter arranged on the external floating roof; sending the first distance, the second distance and the third distance to an upper computer, outputting a calculation result by a state monitor mathematical model, and determining the state of the external floating roof of the storage tank. For an in-service or newly-built external floating roof storage tank, at least one second liquid level meter with a communication module is arranged on the tank top, at least one third liquid level meter with a communication module is arranged on the external floating roof, and then the state of the external floating roof is monitored by a state monitor mathematical model and related algorithms, so that the construction difficulty is reduced, the capital investment is reduced, and the economy and rationality of the state monitoring of the external floating roof are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0034] Figure 1 A flow chart of the method for monitoring the state of the external floating roof of the storage tank provided by the embodiment of the application is shown in the figure.

[0035] Figure 2 A flow chart of another method for monitoring the state of the external floating roof of the storage tank provided by the embodiment of the application is shown in the figure.

[0036] Figure 3 A schematic diagram of the measurement parameters of the external floating roof of the storage tank provided by the embodiment of the application is shown in the figure.

[0037] Figure 4 A principle schematic diagram of the state monitor mathematical model provided by the embodiment of the application is shown in the figure.

[0038] Figure 5A structural schematic diagram of an external floating roof state monitoring device of a storage tank is provided for an embodiment of the present application.

[0039] Figure 6 A structural schematic diagram of an electronic device is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions of the present application will be described in detail below with reference to the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0041] The external floating roof storage tank is a common storage tank for receiving, storing and dispensing oil medium. The oil is generally flammable, explosive and prone to static electricity, which is an unsafe factor. The floating roof, as a very important part of the storage tank sealing, covers the oil surface and floats with the oil, which can greatly reduce the oil evaporation loss and environmental pollution. For example, if the floating roof of the storage tank fails, such as sinking, clamping and tilting, it will cause the failure of primary and secondary sealing, which will greatly cause safety accidents of the storage tank, thereby causing personnel casualties or economic losses. Therefore, real-time state monitoring of the external floating roof of the storage tank is related to the safety of the storage tank and daily management of production. At present, most of the crude oil storage projects in China use external floating roof storage tanks. For the state monitoring of the external floating roof of the storage tank, for newly built external floating roof storage tanks, the commonly used method for monitoring the state of the floating roof of the storage tank mostly needs to install a specific online monitoring system on the storage tank. Through different displacement and inclination position sensors, the control system in the control room is conducted through optical fiber transmission to conduct daily monitoring and maintenance of the external floating roof of the storage tank. The maintenance cost of the online monitoring system and the monitoring equipment is high. For the in-service external floating roof storage tanks, the reconstruction of the online floating roof state monitoring system has large engineering quantity and certain construction difficulty. Therefore, a more convenient and economical external floating roof tank floating roof state monitoring scheme has certain market value and meets the needs of tank area safety guarantee.

[0042] Based on this, the present application provides an external floating roof state monitoring method, device and electronic equipment of a storage tank, which can be applied to applications requiring monitoring of the state of the external floating roof of the storage tank.

[0043] In order to facilitate the understanding of the present embodiment, first, a kind of external floating roof state monitoring method of a storage tank disclosed in the present application is introduced in detail, as shown in Figure 1 The method comprises the following steps:

[0044] In step S102, at least two first liquid level meters arranged on the tank top are used to measure the first distance from the tank bottom to the oil surface at the current time point.

[0045] The above-mentioned storage tank can be understood as an external floating roof storage tank, which is generally used for receiving, storing and dispensing oil medium; and the external floating roof can be understood as a component arranged in the external floating roof storage tank for sealing the oil product, which is normally covered on the oil surface and floats with the oil product.

[0046] The above-mentioned first liquid level meter can be a radar liquid level meter, a servo liquid level meter or a magnetostrictive liquid level meter.

[0047] The radar liquid level meter is an intelligent liquid level measuring instrument, which uses ultrahigh frequency electromagnetic waves to emit from an antenna to the liquid surface of a container to be detected. When the electromagnetic waves encounter the liquid surface, they are reflected back. The instrument detects the time difference between the emitted waves and the reflected waves, thereby calculating the height of the liquid surface. The radar liquid level meter can play its unique advantages in the application of tank area oil measurement, such as non-contact measurement, large measurement range, high precision, simple installation, etc., which fully meet the requirements of accuracy, reliability and stability for tank area oil measurement.

[0048] The measurement of the servo liquid level meter is based on the principle of buoyancy balance. The inner magnet wheel fixed on the driving motor and the outer magnet wheel passing through the precision adding wheel drum complete magnetic coupling. The wheel drum and the driving motor rotate synchronously, the inner magnet and the wheel drum (outer magnet wheel) are completely separated by the shell, and then the measured liquid chamber and the electrical part are completely separated to meet the explosion-proof requirement. The measurement steel wires are evenly and neatly arranged on the wheel drum. The float is sent into the tank through the measurement steel wires. When the liquid level (interface or specific gravity) in the tank changes, the weight of the float changes with the changed liquid level, and the changed weight of the float causes the coupling difference between the wheel drum (outer magnet wheel) and the inner magnet wheel. After the signal is sent to the microprocessor for calculation and judgment, the servo motor is given a control instruction, so that the float in the tank changes with the change of the liquid level height. Then the rotation point of the measurement wheel drum can be calculated to obtain the height value of the liquid level.

[0049] The measuring rod of the magnetostrictive liquid level meter is provided with a float, which can move up and down along the measuring rod with the change of the liquid level. There is a group of permanent magnetic rings inside the float. When the pulsed current magnetic field meets the magnetic ring magnetic field generated by the float, the magnetic field around the float changes, thereby causing a torsional wave pulse in the waveguide wire made of magnetostrictive material at the position of the float. The pulse is transmitted back along the waveguide wire at a fixed speed and is detected by the detection mechanism. By measuring the time difference between the pulsed current and the torsional wave, the position of the float, i.e. the position of the liquid surface, can be accurately determined.

[0050] According to SH / T 3184-2017 "petrochemical tank farm automation system design specification" can be known, each in service or newly built outer floating roof tank has been provided with an outer floating roof tank metering system for monitoring and metering oil level, the outer floating roof tank metering system is generally composed of 2 liquid level meters (i.e. the first liquid level meter) provided on the tank top, high-low liquid level switch, high-precision pressure transmitter provided on the tank top and tank metering management system.

[0051] Among them, the high-low liquid level switch is equivalent to an alarm switch, which sends an alarm when the liquid level measured by the first liquid level meter is higher than the pre-set high liquid level or lower than the pre-set bottom liquid level.

[0052] The two liquid level meters provided on the tank top can measure the oil level height in the tank, i.e. the oil surface height, one of which can form a safety interlock with the high-low liquid level switch, such as the measurement height of the two liquid level meters is sent to the tank metering management system, when the management system finds that the measurement height of one liquid level meter is higher than the pre-set high liquid level or lower than the pre-set bottom liquid level, it can control the high-low liquid level switch to send an alarm, but at this time if the measurement height of the other liquid level meter is not higher than the pre-set high liquid level or lower than the pre-set bottom liquid level, it means that the measurement of the liquid level meter may have errors, so even if the high-low liquid level switch sends an alarm, the oil filling operation can be stopped first, and the oil filling operation can be stopped when the measurement height of the two liquid level meters is higher than the pre-set high liquid level or lower than the pre-set bottom liquid level, so as to avoid improper operation and cause certain loss.

[0053] The high-precision pressure transmitter provided on the tank top is used to obtain the pressure of the oil in the tank, and the oil density is calculated according to the pressure and the liquid level height measured by the first liquid level meter, so as to judge whether the oil contains too much impurity or is pure.

[0054] In actual implementation, although each in-service or newly built outer floating roof tank has been provided with an outer floating roof tank metering system, the outer floating roof tank metering system can only monitor and meter the oil level, and has no monitoring function of the outer floating roof state (i.e. the floating plate state).

[0055] To this end, the traditional external floating roof state monitoring method is to additionally set a fiber transmission floating roof state monitoring system. Specifically, by installing displacement, inclination position sensors, fiber transceivers, explosion-proof junction boxes, optical fibers, PLC upper computers and related installation accessories on the floating roof, increasing PLC configuration software, central control room related configuration and other software management systems, the movement state of the floating roof is measured, the signal is transmitted to the central control room through the optical fiber, and the configuration is performed in the system of the central control room. The manual time and investment of the additional online monitoring system and monitoring equipment are relatively high, resulting in high maintenance cost, great construction difficulty, lack of convenience and economy.

[0056] The external floating roof state monitoring method of the present application further adjusts the hardware and software on the existing external floating roof tank metering system to increase the floating roof state monitoring function of the external floating roof tank metering system without the need to additionally install a specific online monitoring system on the tank.

[0057] Step S104, measuring the second distance from the tank top to the external floating roof at the current time point through at least one second liquid level meter arranged on the tank top.

[0058] Step S106, measuring the third distance from the oil surface in the tank to the external floating roof at the current time point through at least one third liquid level meter arranged on the external floating roof; wherein each first liquid level meter, each second liquid level meter and each third liquid level meter each include a communication module in communication connection with the upper computer.

[0059] The above-mentioned second liquid level meter and third liquid level meter generally use a radar liquid level meter with wireless transmission function.

[0060] Specifically, the present application can increase one or more radar liquid level meters with wireless transmission function on the tank top and the floating roof (equivalent to the above-mentioned external floating roof) of the existing external floating roof tank metering system, for monitoring the distance from the floating roof to the tank top (equivalent to the above-mentioned second distance) and the distance from the floating roof to the oil product (equivalent to the above-mentioned third distance); wherein the two liquid level meters already installed on the tank top in the external floating roof tank metering system can be used to monitor the liquid level height of the oil product (equivalent to the above-mentioned first distance).

[0061] Step S108, sending the first distance, the second distance and the third distance to the upper computer through the plurality of communication modules, and outputting the calculation results through the state monitor mathematical model pre-set in the upper computer.

[0062] Each first liquid level meter, each second liquid level meter and each third liquid level meter each have a communication module in communication connection with the upper computer.

[0063] The host computer can be a host computer in an existing tank metering management system. In actual implementation, the established state monitor mathematical model can be pre-set in the host computer, and the first distance, the second distance, and the third distance obtained are used to monitor the outer floating roof state.

[0064] In the implementation process, it is assumed that each first liquid level meter, each second liquid level meter, and each third liquid level meter are radar liquid level meters, and the measured first distance, second distance, and third distance (equivalent to distance signals) can be transmitted to the host computer of the tank metering management system through the communication module of the corresponding radar liquid level meter, such as a tank radar HUB (hub), and configured in the host computer. The state monitor mathematical model pre-set in the host computer is used to monitor the outer floating roof state of the tank in real time. When the outer floating roof fails, the tank management system can enter an alarm state or participate in the safety interlocking of the tank instrument according to the production management needs.

[0065] In step S110, the outer floating roof state of the tank at the current time point is determined based on the first distance, the second distance, the third distance, and the calculation result.

[0066] The outer floating roof state monitoring method for monitoring the outer floating roof state by using the floating plate state observer can measure the height of the floating plate from the tank roof and the height of the floating plate from the oil product by installing radar liquid level meters with wireless transmission function and related installation accessories at positions on the floating plate and the floating roof that are easy to install and maintain. The hardware measurement signals can be transmitted to the tank metering management system through the communication module and configured in the tank metering management system to monitor the floating plate state. This method can save labor time and investment, has low cost and simple construction, improves convenience and economy compared to traditional methods, has certain market value, and meets the needs of tank safety protection.

[0067] Specifically, for in-service or newly built outer floating roof tanks, the outer floating roof state monitoring method provided by the present application has small construction engineering quantity, low investment, and not difficult to implement, and has certain economic efficiency and rationality of implementation method.

[0068] Further, relying on the existing tank metering system of the tank, the monitoring signals are transmitted to the tank metering system and configured in the management software of the tank metering system. On the one hand, no other host computer or software management system needs to be added, which is convenient for operation and maintenance. On the other hand, the function diversity of the tank metering system is increased, and the redundancy of the tank capacity safety management is increased.

[0069] The outer floating roof state monitoring method of the storage tank comprises the following steps: measuring a first distance from a tank bottom to an oil surface at a current time point through at least two first liquid level gauges arranged on a tank top; measuring a second distance from the tank top to an outer floating roof at the current time point through at least one second liquid level gauge arranged on the tank top; measuring a third distance from an oil surface in the storage tank to the outer floating roof at the current time point through at least one third liquid level gauge arranged on the outer floating roof; sending the first distance, the second distance and the third distance to an upper computer; outputting a calculation result through a state monitor mathematical model prearranged in the upper computer; and determining a state of the outer floating roof of the storage tank.

[0070] The embodiment of the present application further provides another outer floating roof state monitoring method of a storage tank, which is implemented on the basis of the above-mentioned embodiment. Figure 2 As shown in the figure, the method comprises the following steps:

[0071] In the step S202, the first distance from the tank bottom to the oil surface at the current time point is measured through the at least two first liquid level gauges arranged on the tank top.

[0072] In the step S204, the second distance from the tank top to the outer floating roof at the current time point is measured through the at least one second liquid level gauge arranged on the tank top.

[0073] In the step S206, the third distance from the oil surface in the storage tank to the outer floating roof at the current time point is measured through the at least one third liquid level gauge arranged on the outer floating roof; wherein each first liquid level gauge, each second liquid level gauge and each third liquid level gauge all comprise a communication module in communication connection with the upper computer.

[0074] In the specific implementation process, reference can be made to a measurement parameter diagram of an outer floating roof of a storage tank as shown in the figure. Figure 3 In the figure, d1 can represent the second distance from the tank top to the outer floating roof (i.e. different height positions of the outer floating roof); d2 can represent the third distance from the oil surface in the storage tank to the outer floating roof (i.e. a gap between the outer floating roof and the oil product); d3 can represent the first distance from the tank bottom to the oil surface (i.e. the height of the oil product liquid level); and H can represent a standard height of the storage tank.

[0075] In the step S208, the first distance, the second distance and the third distance are sent to the upper computer through the plurality of communication modules, and a calculation result is output through the state monitor mathematical model prearranged in the upper computer.

[0076] In the implementation process, by measuring different height positions (d1) of the outer floating roof, the gap (d2) between the outer floating roof and the oil product, and the oil product height level (d3), a storage tank floating plate state monitor (equivalent to the above state monitor mathematical model) can be established, and through a certain calculation algorithm, the state of the outer floating roof can be monitored in real time.

[0077] The above state monitor mathematical model can be represented by the following formula:

[0078] H(t) = d1(t) + d2(t) + d3(t) + φH(t);

[0079] Wherein, H(t) is the storage tank calculation height corresponding to time t; d1(t) is the second distance corresponding to time t; d2(t) is the third distance corresponding to time t; d3(t) is the first distance corresponding to time t; and φH(t) is the error compensation of the storage tank calculation height corresponding to time t.

[0080] The above t can include t0, t1…tn multiple sampling time points.

[0081] In the implementation process, considering that there may be measurement errors in the measurement process, it is difficult to achieve an ideal state, and the error compensation of the storage tank calculation height corresponding to the sampling time point can be introduced when calculating the storage tank calculation height corresponding to each sampling time point.

[0082] Step S210, the calculation result is the storage tank calculation height corresponding to the current time point; if the storage tank calculation height corresponding to the current time point is equal to the standard height of the storage tank, the third distance is equal to zero, and the first distance is not greater than the preset minimum liquid level height, the first alarm information is output through the upper computer; wherein, the first alarm information is used to indicate that the outer floating roof is in the sinking plate state.

[0083] In the implementation process, if the state monitor mathematical model is H(t) = d1(t) + d2(t) + d3(t) + φH(t), the calculation result is the storage tank calculation height corresponding to the current time point; if it is desired to monitor the state of the outer floating roof of the storage tank corresponding to the current time point, assuming that the current time point is t1, the second distance d1(t1) from the tank top to the outer floating roof measured by the above first liquid level, second liquid level meter and third liquid level meter at the current time point t1 can be obtained; the third distance d2(t1) from the oil surface in the tank to the outer floating roof; the first distance d3(t1) from the tank bottom to the oil surface. Then the state monitor mathematical model pre-set in the upper computer can output the storage tank calculation height H(t1) corresponding to the current time point t1, that is, H(t1) = d1(t1) + d2(t1) + d3(t1) + φH(t1).

[0084] In actual implementation, the above outer floating roof state can include a normal state and a fault state; wherein the common fault state can be divided into the following aspects:

[0085] (1) Submerged state: the storage tank is submerged, the outer floating roof is submerged, and is damaged;

[0086] (2) Top-out state: the storage tank is overfilled, the outer floating roof is top-out, and a safety accident occurs;

[0087] (3) Jammed state: the outer floating roof is jammed, the seal of the storage tank is damaged, the automatic breathing of the storage tank is damaged, and a safety accident is caused;

[0088] (4) Oil seepage state: the outer floating roof seeps oil, the floating roof is damaged, and the seal of the floating roof is damaged.

[0089] According to the above common fault state of the outer floating roof, the application can monitor the state of the outer floating roof in real time through a certain calculation algorithm based on the established state observer and the measured first distance, second distance and third distance. When the outer floating roof fails, the storage tank management system enters an alarm state, or participates in the safety interlocking of the storage tank instrument according to the production management needs.

[0090] Specifically, still taking the current time point t1 as an example, if the storage tank calculation height H(t1) corresponding to the current time point t1 = H (i.e. the standard height of the storage tank), and the first distance d3(t1) from the tank bottom to the oil surface measured at the current time point t1 ≤ Hmin (the low-low liquid level of the storage tank, i.e. the preset lowest liquid level height), and the third distance d2(t1) from the oil surface in the storage tank to the outer floating roof measured at the current time point t1 = 0; it can be considered that the storage tank is submerged and the outer floating roof is submerged at the current time point t1, and the first alarm information can be output by the upper computer to remind the relevant staff that the outer floating roof is in the submerged state.

[0091] Step S212, if the storage tank calculation height corresponding to the current time point is equal to the standard height of the storage tank, the third distance is equal to zero, and the first distance is not less than the preset highest liquid level height, the second alarm information is output by the upper computer; wherein the second alarm information is used to indicate that the outer floating roof is in the top-out state.

[0092] Specifically, still taking the assumption that the current time point is t1 as an example, if the calculated height H(t1) of the storage tank corresponding to the current time point t1 is equal to H (i.e., the standard height of the storage tank), and the first distance d3(t1) from the tank bottom to the oil surface measured at the current time point t1 is greater than or equal to Hmax (i.e., the preset highest liquid level height), and the third distance d2(t1) from the oil surface to the outer floating roof in the storage tank measured at the current time point t1 is equal to 0; it can be considered that the storage tank corresponding to the current time point t1 is in an overflow state, and the outer floating roof is lifted out, and the second alarm information can be output through the upper computer to remind the relevant staff that the outer floating roof is in a lifted-out state.

[0093] It should be noted that the above lowest liquid level height and highest liquid level height can be set according to actual conditions, for example, the standard height of the storage tank is 5 m, the lowest liquid level height can be set to 1 m, 1.5 m, etc., and the highest liquid level height can be set to 4 m, 4.5 m, etc., and the specific implementation is not limited.

[0094] Step S214, if the calculated height of the storage tank corresponding to the current time point is not equal to the standard height of the storage tank, and the third distance is not equal to zero, output the third alarm information through the upper computer; wherein the third alarm information is used to indicate that the outer floating roof is in a blocked state or an oil seepage state.

[0095] Specifically, still taking the assumption that the current time point is t1 as an example, if the calculated height H(t1) of the storage tank corresponding to the current time point t1 is not equal to H (i.e., the standard height of the storage tank), and the third distance d2(t1) from the oil surface to the outer floating roof in the storage tank measured at the current time point t1 is not equal to 0; it can be considered that the outer floating roof is blocked or the outer floating roof is seeping oil, and the outer floating roof is damaged, and the third alarm information can be output through the upper computer to remind the relevant staff that the outer floating roof is in a blocked state or an oil seepage state.

[0096] In the specific implementation process, the above state monitor mathematical model can also be represented by the following formula:

[0097] V(t) = D(dm(tn-t0));

[0098] Wherein, t=t0, t1…tn, is the measurement time point, that is, the sampling time point; D(dm(tn-t0)) is the differential of the outer floating roof height or the oil surface height with respect to time; when m is 1, V(t) is the rising speed or the falling speed of the outer floating roof; when m is 3, V(t) is the rising speed or the falling speed of the oil surface.

[0099] In the implementation process, when m is 1, V(t) can be represented as V1(t), since d1 is the second distance from the tank top to the outer floating roof, V1(t) = V(t) = D(d1(tn-t0)) can represent the rising speed or the falling speed of the outer floating roof; when m is 3, V(t) can be represented as V3(t), since d3 is the first distance from the tank bottom to the oil surface, V3(t) = V(t) = D(d3(tn-t0)) can represent the rising speed or the falling speed of the oil surface.

[0100] In step S216, the calculation result is the rising speed or the falling speed of the outer floating roof corresponding to the current time point, and the rising speed or the falling speed of the oil surface corresponding to the current time point; the ratio of the first speed of the outer floating roof corresponding to the current time point to the second speed of the oil surface is calculated, to obtain a first ratio result; wherein the first speed is the rising speed or the falling speed of the outer floating roof; the second speed is the rising speed or the falling speed of the oil surface.

[0101] In the implementation process, if the state monitor mathematical model is V(t) = D(dm(tn-t0)), the calculation result is the rising speed or the falling speed of the outer floating roof corresponding to the current time point, and the rising speed or the falling speed of the oil surface corresponding to the current time point; if it is desired to monitor the state of the outer floating roof of the storage tank corresponding to the current time point, assuming that the current time point is t1, the second distance d1(t1) from the tank top to the outer floating roof measured by the first liquid level meter, the second liquid level meter and the third liquid level meter at the current time point t1 can be obtained; the third distance d2(t1) from the oil surface to the outer floating roof in the storage tank; the first distance d3(t1) from the tank bottom to the oil surface. Then the rising speed or the falling speed V1(t) of the outer floating roof corresponding to the current time point t1 and the rising speed or the falling speed V3(t) of the oil surface corresponding to the current time point t1 can be output by the state monitor mathematical model pre-set in the upper computer, V1(t) = D(d1(t1-t0)), and V3(t) = D(d3(t1-t0)), and the ratio of the first speed V1(t) of the outer floating roof corresponding to the current time point to the second speed V3(t) of the oil surface is calculated, to obtain a first ratio result.

[0102] In step S218, if the first ratio result is equal to a preset constant, the fourth alarm information is output by the upper computer; wherein the fourth alarm information is used to indicate that the outer floating roof is in a normal state.

[0103] In actual implementation, when the outer floating roof is in normal condition, the rising or falling speed of the outer floating roof can constitute a servo system with the oil inlet or outlet of the storage tank, that is, if V1(t)=K V3(t), the speed is in a positive (negative) correlation; wherein K is a constant (equivalent to the above-mentioned preset constant, which can be set according to actual conditions), it can be considered that the outer floating roof at the current time point t1 is in normal condition, and the fourth alarm information can be output by the upper computer to remind the relevant staff that the outer floating roof is in normal state.

[0104] In step S220, if the first ratio result is not equal to the preset constant, the fifth alarm information is output by the upper computer; wherein the fifth alarm information is used to indicate that the outer floating roof is in a jamming state or an oil seepage state.

[0105] If the outer floating roof is jammed or the outer floating roof is seeping oil, the servo system balance is broken, prompting the alarm, and after setting the preset constant K, if V1(t)≠K V3(t), it can be considered that the outer floating roof at the current time point t1 is in an abnormal condition, and the fifth alarm information can be output by the upper computer to remind the relevant staff that the outer floating roof is in a jamming state or an oil seepage state.

[0106] In step S222, based on V(t), a preset algorithm is used to optimize φH(t) to obtain an optimal value; wherein the preset algorithm includes at least one of the following: iterative algorithm, adaptive algorithm, deep learning algorithm.

[0107] In the specific implementation process, the state monitor mathematical model: H(t)=d1(t)+d2(t)+d3(t)+φH(t) in the φH(t), that is, the error compensation of the storage tank calculation height corresponding to the time t, can be compensated by a certain algorithm (such as iteration, adaptive or deep learning algorithm) according to different sampling time points t0, t1…tn, and the adaptability and robustness of H(t), V(t) state monitor is constantly improved. Wherein, the calculation formula of φH(t) based on V(t) is as follows:

[0108]

[0109] In actual implementation, a preset algorithm can be used, such as using iterative method to calculate the target error function E; assuming that P (P=1, 2, …, P) groups of input and output samples are set, the target error function is:

[0110]

[0111] In the formula: is the calculated expected liquid level value; is the actual liquid level value.

[0112] Specifically, it can be seen from Figure 4The principle diagram of one kind state monitor mathematical model is shown, the radar measurement signal control object is the tank measurement height (namely first distance, second distance and third distance), different measurement height can establish mathematical model V (t) = D (dm (tn-t0) ), according to V (t) = D (dm (tn-t0) ), preset algorithm can be used to calculate the floating plate position compensation φH (t), according to φH (t) and different measurement height can establish another mathematical model H (t) =d1 (t) + d2 (t) + d3 (t) + φH (t), then certain calculation algorithm can be used to monitor the outer floating roof state in real time.

[0113] The above-mentioned outer floating roof state monitoring method comprises the following steps: measuring the first distance from the tank bottom to the oil surface, the second distance from the tank top to the outer floating roof by at least two first liquid level meters and at least one second liquid level meter arranged on the tank top; measuring the third distance from the oil surface in the tank to the outer floating roof by at least one third liquid level meter arranged on the outer floating roof; sending the first distance, the second distance and the third distance to the upper computer, outputting the calculation result by the state monitor mathematical model, and determining the outer floating roof state of the tank. This method can be used for the in-service or newly-built outer floating roof tank, at least one second liquid level meter with a communication module is arranged on the tank top, at least one third liquid level meter with a communication module is arranged on the outer floating roof, and then the state monitor mathematical model and the related algorithm are used to monitor the outer floating roof state, so that the construction difficulty is reduced, the capital investment is reduced, and the economy and rationality of the outer floating roof state monitoring are improved.

[0114] Further, the floating plate state monitor V (t) = D (dm (tn-t0) ) can not only observe the floating plate state, but also observe the correlation between the oil product movement and the floating plate movement, so that the related data can be directly collected for the tank farm manager, the tank farm management experience is enhanced, and the actual demand of the user is met.

[0115] The embodiment of the present application also provides a tank outer floating roof state monitoring device, which comprises the above-mentioned tank outer floating roof state monitoring method. Figure 5As shown, the device comprises: a first measurement module 50 for measuring a first distance from the tank bottom to the oil surface at the current time point through at least two first liquid level gauges arranged on the tank top; a second measurement module 51 for measuring a second distance from the tank top to the outer floating roof at the current time point through at least one second liquid level gauge arranged on the tank top; and a third measurement module 52 for measuring a third distance from the oil surface in the storage tank to the outer floating roof at the current time point through at least one third liquid level gauge arranged on the outer floating roof; wherein each first liquid level gauge, each second liquid level gauge, and each third liquid level gauge each comprises a communication module in communication connection with an upper computer; a sending module 53 for sending the first distance, the second distance, and the third distance to the upper computer through the plurality of communication modules, and outputting a calculation result through a state monitor mathematical model pre-set in the upper computer; and a determination module 54 for determining the state of the outer floating roof of the storage tank at the current time point based on the first distance, the second distance, the third distance, and the calculation result.

[0116] Further, the state monitor mathematical model is represented by the following formula:

[0117] H(t) = d1(t) + d2(t) + d3(t) + φH(t); wherein H(t) is the calculated height of the storage tank corresponding to time t; d1(t) is the second distance corresponding to time t; d2(t) is the third distance corresponding to time t; d3(t) is the first distance corresponding to time t; and φH(t) is the error compensation of the calculated height of the storage tank corresponding to time t.

[0118] Further, the determination module is further configured to: if the calculated height of the storage tank corresponding to the current time point is equal to the standard height of the storage tank, the third distance is equal to zero, and the first distance is not greater than a pre-set lowest liquid level height, output first alarm information through the upper computer; wherein the first alarm information is used to indicate that the outer floating roof is in a sinking state; if the calculated height of the storage tank corresponding to the current time point is equal to the standard height of the storage tank, the third distance is equal to zero, and the first distance is not less than a pre-set highest liquid level height, output second alarm information through the upper computer; wherein the second alarm information is used to indicate that the outer floating roof is in a lifted state; and if the calculated height of the storage tank corresponding to the current time point is not equal to the standard height of the storage tank, and the third distance is not equal to zero, output third alarm information through the upper computer; wherein the third alarm information is used to indicate that the outer floating roof is in a blocked state or an oil seepage state.

[0119] Further, the state monitor mathematical model is further represented by the following formula:

[0120] V(t) = D(dm(tn-t0)); where t = t0, t1…tn are the measurement time points; D(dm(tn-t0)) is the differential of the change in the height of the external floating roof or the oil surface height with time; when m is 1, V(t) is the rising or falling speed of the external floating roof; when m is 3, V(t) is the rising or falling speed of the oil surface.

[0121] Furthermore, the determining module is also used to: calculate the ratio of the first velocity of the external floating roof to the second velocity of the oil surface at the current time point, and obtain the first ratio result; wherein, the first velocity is the rising or falling velocity of the external floating roof; the second velocity is the rising or falling velocity of the oil surface; if the first ratio result is equal to a preset constant, output a fourth alarm message through the host computer; wherein, the fourth alarm message is used to indicate that the external floating roof is in a normal state; if the first ratio result is not equal to the preset constant, output a fifth alarm message through the host computer; wherein, the fifth alarm message is used to indicate that the external floating roof is in a jammed state or an oil leakage state.

[0122] Furthermore, the device also includes: optimizing φH(t) based on V(t) using a preset algorithm to obtain the optimal value; wherein the preset algorithm includes at least one of the following: an iterative algorithm, an adaptive algorithm, and a deep learning algorithm.

[0123] Furthermore, each first level gauge is a radar level gauge, a servo level gauge, or a magnetostrictive level gauge; each second level gauge and each third level gauge are radar level gauges.

[0124] The external floating roof status monitoring device for storage tanks provided in this embodiment of the invention has the same implementation principle and technical effects as the aforementioned external floating roof status monitoring method embodiment for storage tanks. For the external floating roof status monitoring device embodiment, please refer to the corresponding content in the aforementioned external floating roof status monitoring method embodiment for storage tanks.

[0125] This invention also provides an electronic device, see [link to relevant documentation]. Figure 6 As shown, the electronic device includes a processor 130 and a memory 131. The memory 131 stores machine-executable instructions that can be executed by the processor 130. The processor 130 executes the machine-executable instructions to implement the above-mentioned external floating roof status monitoring method for the storage tank.

[0126] Furthermore, Figure 6 The electronic device shown also includes a bus 132 and a communication interface 133, with the processor 130, the communication interface 133 and the memory 131 connected via the bus 132.

[0127] The memory 131 can include a high-speed random access memory (RAM) and can also include a non-volatile memory such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 133 (which can be wired or wireless), and the Internet, a wide area network, a local network, a metropolitan area network, etc. can be used. The bus 132 can be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one bidirectional arrow is used to represent the system network element and at least one other network element in the above method, but it does not mean that there is only one bus or only one type of bus.

[0128] The processor 130 can be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method can be completed by the integrated logic circuit of hardware in the processor 130 or the instructions in the form of software. The processor 130 described above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logic block disclosed in the embodiment of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiment of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium in the art. The storage medium is located in the memory 131, and the processor 130 reads the information in the memory 131, and combines the hardware to complete the steps of the method of the above embodiment.

[0129] The embodiment of the present application also provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions, when called and executed by a processor, cause the processor to implement the state monitoring method of the outer floating roof of the storage tank.

[0130] The state monitoring method of the outer floating roof of the storage tank, the device and the electronic equipment provided by the embodiment of the present application include a computer readable storage medium storing program codes, the instructions included in the program codes can be used to execute the method described in the foregoing method embodiment, and specific implementation can be referred to the method embodiment, which will not be described here.

[0131] If the functions are realized in the form of software function units and sold or used as independent products, the functions can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0132] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of monitoring the condition of an external floating roof of a storage tank, characterized by, The method comprises: measuring a first distance from the tank bottom to the oil surface at a current time point through at least two first liquid level gauges arranged on the tank top; measuring a second distance from the tank top to the outer floating roof at the current time point through at least one second liquid level gauge arranged on the tank top; measuring a third distance from the oil surface in the tank to the outer floating roof at the current time point through at least one third liquid level gauge arranged on the outer floating roof; wherein each of the first liquid level gauges, each of the second liquid level gauges, and each of the third liquid level gauges comprises a communication module in communication connection with an upper computer; sending the first distance, the second distance, and the third distance to the upper computer through a plurality of the communication modules, and outputting a calculation result through a state monitor mathematical model pre-set in the upper computer; determining the state of the outer floating roof of the tank at the current time point based on the first distance, the second distance, the third distance, and the calculation result; the state monitor mathematical model is represented by the following formula: H(t) = d1(t) + d2(t) + d3(t) + φH(t); wherein H(t) is the calculated height of the tank corresponding to time t; d1(t) is the second distance corresponding to time t; d2(t) is the third distance corresponding to time t; d3(t) is the first distance corresponding to time t; and φH(t) is the error compensation of the calculated height of the tank corresponding to time t; the calculation result is the calculated height of the tank corresponding to the current time point; and the step of determining the state of the outer floating roof of the tank at the current time point based on the first distance, the second distance, the third distance, and the calculation result comprises: if the calculated height of the tank corresponding to the current time point is equal to the standard height of the tank, the third distance is equal to zero, and the first distance is not greater than the preset lowest liquid level height, outputting first alarm information through the upper computer; wherein the first alarm information is used to indicate that the outer floating roof is in a sinking state; if the calculated height of the tank corresponding to the current time point is equal to the standard height of the tank, the third distance is equal to zero, and the first distance is not less than the preset highest liquid level height, outputting second alarm information through the upper computer; wherein the second alarm information is used to indicate that the outer floating roof is in a lifting state; if the calculated height of the tank corresponding to the current time point is not equal to the standard height of the tank, and the third distance is not equal to zero, outputting third alarm information through the upper computer; wherein the third alarm information is used to indicate that the outer floating roof is in a jamming state or an oil seepage state.

2. The method of claim 1, wherein, the state monitor mathematical model is also represented by the following formula: V(t) = D(dm(tn-t0)); wherein t = t0, t1, …, tn are the time points of measurement; D(dm(tn-t0)) is the differential of the outer floating roof height or the oil surface height with respect to time; when m is 1, V(t) is the rising speed or the falling speed of the outer floating roof; and when m is 3, V(t) is the rising speed or the falling speed of the oil surface.

3. The method of claim 1, wherein, The calculation result is the rising speed or falling speed of the outer floating roof corresponding to the current time point, and the rising speed or falling speed of the oil surface corresponding to the current time point; The step of determining the state of the outer floating roof of the storage tank at the current time point based on the first distance, the second distance, the third distance and the calculation result comprises: calculating a ratio of the first speed of the outer floating roof corresponding to the current time point to the second speed of the oil surface, to obtain a first ratio result; wherein the first speed is the rising speed or falling speed of the outer floating roof, and the second speed is the rising speed or falling speed of the oil surface; if the first ratio result is equal to a preset constant, outputting a fourth alarm information through the upper computer; wherein the fourth alarm information is used to indicate that the outer floating roof is in a normal state; if the first ratio result is not equal to the preset constant, outputting a fifth alarm information through the upper computer; wherein the fifth alarm information is used to indicate that the outer floating roof is in a jamming state or an oil seepage state.

4. The method of claim 2, wherein, The method further comprises: based on the V(t), optimizing the φH(t) by using a preset algorithm to obtain an optimal value; wherein the preset algorithm comprises at least one of the following: an iterative algorithm, an adaptive algorithm, and a deep learning algorithm.

5. The method of claim 1, wherein, Each of the first liquid level meters is a radar liquid level meter, a servo liquid level meter or a magnetostrictive liquid level meter; each of the second liquid level meters and each of the third liquid level meters is a radar liquid level meter.

6. An external floating roof state monitoring device for a storage tank, applied to the external floating roof state monitoring method according to any one of claims 1 to 5, characterized by, The device comprises: a first measurement module configured to measure, at a current time point, a first distance from a tank bottom to an oil surface by using at least two first liquid level meters arranged on a tank top; a second measurement module configured to measure, at the current time point, a second distance from the tank top to an outer floating roof by using at least one second liquid level meter arranged on the tank top; a third measurement module configured to measure, at the current time point, a third distance from the oil surface in the storage tank to the outer floating roof by using at least one third liquid level meter arranged on the outer floating roof; wherein each of the first liquid level meters, each of the second liquid level meters and each of the third liquid level meters comprises a communication module in communication connection with an upper computer; a sending module configured to send the first distance, the second distance and the third distance to the upper computer by using a plurality of the communication modules, and output a calculation result by using a state monitor mathematical model prearranged in the upper computer; a determination module configured to determine a state of the outer floating roof of the storage tank at the current time point based on the first distance, the second distance, the third distance and the calculation result.

7. An electronic device, comprising: The computer readable storage medium stores a computer program, and the computer program is run by a processor to execute the steps of the method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is run by a processor to execute the steps of the method according to any one of claims 1-5.

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