CN113376081A - Oil refining device fractionating tower top corrosion risk monitoring system - Google Patents
Oil refining device fractionating tower top corrosion risk monitoring system Download PDFInfo
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- CN113376081A CN113376081A CN202110408611.XA CN202110408611A CN113376081A CN 113376081 A CN113376081 A CN 113376081A CN 202110408611 A CN202110408611 A CN 202110408611A CN 113376081 A CN113376081 A CN 113376081A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Abstract
The invention provides a system for monitoring corrosion risk of a fractionating tower top of an oil refining device, which comprises: the device comprises an online measuring system for online monitoring the pH value of a fluid medium at the top of a fractionating tower and the content of a corrosive medium in the fluid medium, a data acquisition system for acquiring real-time monitoring data acquired by online monitoring of the online measuring system in real time and transmitting the real-time monitoring data acquired by the data acquisition unit in real time, and a data processing system for processing and analyzing the received real-time monitoring data in real time. By monitoring the pH value of the fluid medium at the top of the fractionating tower and the contents of chloride ions, iron ions, sulfides and ammonia nitrogen in the fluid medium on line in real time, the pH value of the fluid medium at the top of the fractionating tower of the oil refining device and the contents of various corrosion factors in the fluid medium can be quickly measured in real time for a long time, so that the online monitoring of the corrosion risk at the top of the fractionating tower is realized, and the corrosion risk is further reduced.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention of oil refining equipment, and particularly relates to a system for monitoring corrosion risk of a fractionating tower top of an oil refining device.
Background
The corrosion problem usually exists in chemical production processes of petrifaction, coal gasification, steel and the like, and the equipment is damaged due to corrosion, and the safety, stability and long-period operation of the oil refining device are influenced due to the missing monitoring of the corrosion risk generation process. The fractionating tower top of the oil refining device is generally easy to be corroded by factors such as the pH value of a fluid medium, chloride ions, iron ions, sulfides and ammonia nitrogen in the fluid medium, and especially, when the corrosion parameters (the pH value of the fluid medium, the content of the chloride ions, the content of the iron ions, the content of the sulfides and the content of the ammonia nitrogen in the fluid medium) exceed the early warning value, the corrosion to the fractionating tower top of the oil refining device is aggravated.
At present, to the monitoring of above-mentioned corrosion parameter (fluid medium pH value, the content of chloride ion, iron ion, sulphide and ammonia nitrogen in the fluid medium), generally measure in the laboratory after regularly off-line sampling, not only there is the problem that detection frequency is low, the assay consumes a long time, still can have serious hysteresis quality, can't realize the real-time supervision to oil refining plant fractionating tower top corrosion risk, lead to being difficult to in time preventing and controlling the corrosion risk at oil refining plant fractionating tower top, there is serious potential safety hazard.
Disclosure of Invention
Based on the problem that the corrosion risk of the fractionating tower top of the oil refining device in the prior art is difficult to timely prevent and control, the embodiment of the invention aims to provide the system for monitoring the corrosion risk of the fractionating tower top of the oil refining device, which can monitor the corrosion parameters of the fractionating tower top of the oil refining device on line in real time for a long time, can timely find the abnormal condition of a corrosion medium and send out early warning to guide the oil refining device to timely adjust the corrosion prevention measures.
In order to achieve the purpose, the invention adopts the technical scheme that: provided is a system for monitoring corrosion risk of a fractionating tower top of an oil refining device, which comprises:
the online measurement system is used for online monitoring the pH value of the fluid medium at the top of the fractionating tower and the content of the corrosive medium in the fluid medium;
the data acquisition system is electrically connected with the online measurement system and comprises a data acquisition unit for acquiring real-time monitoring data acquired by online monitoring of the online measurement system in real time and a data transmission unit for transmitting the real-time monitoring data acquired by the data acquisition unit in real time in a wireless/wired mode; and
the data processing system is in communication connection with the data transmission unit and is used for receiving the real-time monitoring data transmitted by the data transmission unit in real time and carrying out real-time processing analysis on the received real-time monitoring data, and the data processing system can display real-time monitoring information according to the processing and analyzing result of the real-time monitoring data so as to send out early warning information when the pH value of the fluid medium at the top of the fractionating tower and/or the content of a corrosive medium in the fluid medium are abnormal;
the online measuring system comprises an online pH meter for measuring the pH value of the fluid medium in real time, an online chloride ion measuring instrument for measuring the content of chloride ions in the fluid medium in real time, an online iron ion measuring instrument for measuring the content of iron ions in the fluid medium in real time, an online sulfide measuring instrument for measuring the content of sulfide in the fluid medium in real time, and an online ammonia nitrogen measuring instrument for measuring the content of ammonia nitrogen in the fluid medium in real time.
Further, the online pH is a pH sensor that is resistant to sulfide poisoning.
Furthermore, the oil refining device fractionating tower top corrosion risk monitoring system further comprises a pretreatment device for pretreating the fluid medium to be detected at the fractionating tower top, and the pretreatment device comprises a temperature control device for controlling and adjusting the temperature of the fluid medium to be detected.
Further, the pretreatment device also comprises a pressure adjusting device for controlling and adjusting the fluid pressure of the fluid medium to be detected.
Further, the pretreatment device also comprises a filtering device for filtering particulate matters in the fluid medium to be detected.
Furthermore, the oil refining device fractionating tower top corrosion risk monitoring system further comprises an explosion-proof system, and the online measuring system and the preprocessing device are both arranged in the explosion-proof system.
Furthermore, the explosion-proof system is a positive pressure inflatable explosion-proof cabin, and the online measurement system and the pretreatment device are both arranged in the positive pressure inflatable explosion-proof cabin.
Further, the on-line measuring system is arranged close to the position of a condensation tank water drum at the top of the fractionating tower.
Furthermore, the data processing system comprises a cloud platform arranged in a remote control center and a mobile terminal in communication connection with the cloud platform, and the mobile terminal can receive real-time monitoring information processed by the cloud platform and sent early warning information.
Further, the data processing system further comprises a computer in communication connection with the cloud platform, and the computer is used for being installed at a monitoring point arranged on a detection site.
Compared with the prior art, one or more technical schemes in the embodiment of the invention have at least one of the following beneficial effects:
the oil refining device fractionating tower top corrosion risk monitoring system in the embodiment of the invention can rapidly, real-timely and long-term measure the pH value of the fluid medium at the fractionating tower top of the oil refining device and the content of each corrosion factor in the fluid medium by real-time online monitoring the pH value of the fluid medium at the fractionating tower top of the fractionating tower and the content of chloride ions, iron ions, sulfides and ammonia nitrogen in the fluid medium, thereby realizing online monitoring of the tower top corrosion risk of the fractionating tower, facilitating timely evaluation of the corrosion risk at the fractionating tower top of the oil refining device, further guiding the oil refining device to timely adjust anticorrosion measures, reducing the corrosion risk at the fractionating tower top of the oil refining device, and ensuring the safety, stability and long-period operation of the oil refining device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a system for monitoring corrosion risk at the top of a fractionating tower of an oil refining plant according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system for monitoring corrosion risk at the top of a fractionating tower of an oil refining device according to an embodiment of the present invention, which is installed on site.
Wherein, in the figures, the respective reference numerals:
1-an on-line measurement system; 11-online pH meter; 12-on-line chloride ion meter; 13-on-line iron ion meter; 14-on-line sulfide gauge; 15-on-line ammonia nitrogen measuring instrument;
2-a data acquisition system; 21-a data acquisition unit; 22-a data acquisition unit;
3-a data processing system; 31-a cloud platform; 32-a mobile terminal; 33-a computer;
4-a pretreatment device; 41-temperature control device; 42-a pressure regulating device; 43-a filtration device;
5-an explosion-proof system; 6-a fractionation column; 7-a condensation tank; 8-heat exchanger.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "connected" or "disposed" to another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment," "in some embodiments," or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Referring to fig. 1 to fig. 2, a system for monitoring corrosion risk at the top of a fractionating tower of a refinery apparatus according to an embodiment of the present invention will now be described. The oil refining device fractionating tower top corrosion risk monitoring system provided by the embodiment of the invention comprises an online measuring system 1, a data acquisition system 2 and a data processing system 3, wherein the online measuring system 1 can simultaneously perform online monitoring on the pH value of a fluid medium at the tower top of a fractionating tower 6 and the content of a corrosion medium in the fluid medium, the data acquisition system 2 is electrically connected with the online measuring system 1, and the data acquisition system 2 comprises a data acquisition unit 21 for acquiring real-time monitoring data acquired by the online measuring system 1 in an online monitoring manner in real time and a data acquisition unit 22 for transmitting the real-time monitoring data acquired by the data acquisition unit 21 in a wireless/wired manner in real time. The data processing system 3 is in communication connection with the data acquisition unit 22 in a wireless/wired manner, so that the data processing system 3 can receive the real-time monitoring data transmitted by the data acquisition unit 22 in real time and perform real-time processing and analysis on the received real-time monitoring data. The data processing system 3 can display the real-time monitoring information according to the processing and analyzing result of the real-time monitoring data after the received real-time monitoring data are processed and analyzed in real time, so as to send out early warning information when the pH value of the fluid medium at the top of the fractionating tower 6 and/or the content of the corrosive medium in the fluid medium is abnormal. Specifically, the online measurement system 1 comprises an online pH meter 11 for measuring the pH value of the fluid medium in real time, an online chloride ion measuring instrument 12 for measuring the chloride ion content in the fluid medium in real time, an online iron ion measuring instrument 13 for measuring the iron ion content in the fluid medium in real time, an online sulfide measuring instrument 14 for measuring the sulfide content in the fluid medium in real time, and an online ammonia nitrogen measuring instrument 15 for measuring the ammonia nitrogen content in the fluid medium in real time, so as to realize the real-time online measurement of the pH value, the chloride ion, the iron ion, the sulfide and the ammonia nitrogen content. The data measured by the online pH meter 11, the online chloride ion measuring instrument 12, the online iron ion measuring instrument 13, the online sulfide measuring instrument 14 and the online ammonia nitrogen measuring instrument 15 are collected by the data acquisition unit 21 of the data acquisition system 2, and then transmitted to the data processing system 3 in a wireless or wired manner by the data acquisition unit 22, and the data processing system 3 realizes the display, statistical analysis, monitoring and early warning and the like of the monitored data, thereby realizing the online monitoring of the corrosion risk at the top of the fractionating tower 6. Therefore, the oil refining device fractionating tower top corrosion risk monitoring system provided by the embodiment of the invention can monitor the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device and the content of each corrosion factor in the fluid medium in real time for a long time, can evaluate the corrosion risk at the top of the fractionating tower 6 of the oil refining device in time, and further can guide the oil refining device to adjust the corrosion prevention measures in time and reduce the corrosion risk.
It can be understood that, when the corrosion parameter of the fluid medium at the top of the fractionating tower 6 of the oil refining device exceeds the early warning value, the corrosion risk at the top of the refinery tower increases, and the control range of the early warning value of each monitoring parameter of the data processing system 3 is as follows: the pH control range is as follows: 5.5-7.5 (when organic amine is injected), 7.0-9.0 (when ammonia water is injected), 6.5-8.0 (when organic amine and ammonia water are injected), the Cl content control range is less than or equal to 30mg/L, the iron ion control range is less than or equal to 3mg/L, and the sulfide and ammonia nitrogen control ranges can be set according to the actual conditions of the device. The measuring method of the online chloride ion measuring instrument 12 is an ion selective electrode method or an ion chromatography, the measuring range comprises 0-10 mg/L, 0-500 mg/L, 0-10000 mg/L or other extended ranges, and the precision is less than or equal to +/-5%. The on-line iron ion measuring instrument 13 can simultaneously measure total iron and Fe2+The measuring method is that the measuring range of the phenanthroline spectrophotometry comprises 0-0.02 mg/L, 0-8 mg/L, 0-30 mg/L or other extended ranges, and the precision is less than or equal to +/-3%. The measuring method of the online sulfide measuring instrument 14 is methylene blue spectrophotometry or a sulfur ion indicating electrode titration method, the measuring range comprises 0-2 mg/L, 0-500 mg/L, 0-10000 mg/L or other extended measuring ranges, and the precision is less than or equal to +/-3%. The measurement method of the online ammonia nitrogen measuring instrument 15 is a salicylic acid spectrophotometry, a sodiums reagent spectrophotometry or a gas-sensitive electrode method, the measurement range comprises 0-50 mg/L, 0-1000 mg/L, 0-25000 mg/L or other extended ranges, and the precision is less than or equal to +/-3%.
It can be understood that the data acquisition unit 22 of the data acquisition system 2 is compatible with various device communication protocols, and has 5-way (expandable) RS232/484 communication, and the communication interface of each instrument of the online measurement system 1 is RS232 or RS485, so that the data acquisition system 2 can simultaneously acquire data and device information of a plurality of online monitoring instruments of the online measurement system 1, and transmit the data and device information to the data processing system 3 in a wireless or wired manner.
In some of these embodiments, the in-line pH meter 11 is a pH sensor with high measurement accuracy that is resistant to sulfide poisoning. Wherein the measuring range of the pH sensor is 0-14, and the precision is 0.01. When sulfide is contained in fluid medium (water sample) at monitoring position, Ag is generated due to the reaction of sulfide and Ag + in common pH sensor2S precipitation, Ag produced2The S precipitation can cause the failure of the pH sensor, so that the aim of effectively monitoring the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device for a long time cannot be fulfilled, the corrosion risk at the top of the fractionating tower 6 of the oil refining device is difficult to timely prevent and control, and serious potential safety hazards exist. In the embodiment, the pH sensor which is high in precision, large in range and capable of resisting sulfide poisoning is adopted, the pH sensor resisting sulfide poisoning adopts a technology of pressurizing + ion capture trap, electrode poisoning can be effectively prevented, and the service life is prolonged, so that the pH sensor resisting sulfide poisoning is selected, the pH value of the fluid medium on the top of the fractionating tower 6 of the oil refining device can be effectively monitored for a long time, the oil refining device is guided to adjust anti-corrosion measures in time, and the corrosion risk on the top of the fractionating tower 6 of the oil refining device is prevented and controlled in time.
Referring to fig. 2, in some embodiments, the system for monitoring corrosion risk at the top of the fractionating tower of the oil refining plant further includes a pretreatment device 4 for pretreating the fluid medium to be tested at the top of the fractionating tower 6, and the pretreatment device 4 includes a temperature control device 41 for controlling and adjusting the temperature of the fluid medium to be tested. In this embodiment, the fluid medium (water sample) to be measured at the top of the fractionating tower 6 is pretreated by the temperature control device 41 of the pretreatment device 4, and the fluid medium (water sample) to be measured is adjusted to normal temperature for the online measurement system 1 to measure, so as to avoid the temperature fluctuation or over-low temperature from affecting the measurement accuracy of the online measurement system, thereby ensuring that the online measurement system 1 can realize real-time and accurate online measurement of the pH value, chloride ion, iron ion, sulfide and ammonia nitrogen content, effectively monitoring the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device for a long time, guiding the oil refining device to adjust the anti-corrosion measure in time, and preventing and controlling the corrosion risk at the top of the fractionating tower 6 of the oil refining device in time.
Referring to fig. 2, in some embodiments, the preprocessing unit 4 further includes a pressure regulating unit 42 for controlling and regulating the fluid pressure of the fluid medium to be measured. In this embodiment, the fluid medium (water sample) to be measured at the top of the fractionating tower 6 is pretreated by the pressure regulating device 42 of the pretreatment device 4, and the fluid medium (water sample) to be measured is regulated to normal pressure for the online measurement system 1 to measure, thereby avoiding the pressure fluctuation or the over-high or over-low pressure from affecting the measurement accuracy of the online measurement system, so as to ensure that the online measurement system 1 can realize real-time and accurate online measurement of the pH value, chloride ion, iron ion, sulfide and ammonia nitrogen content, and effectively monitor the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device for a long time, so as to guide the oil refining device to adjust the anti-corrosion measure in time, and timely prevent and control the corrosion risk at the top of the fractionating tower 6 of the oil refining device.
Referring to fig. 2, in some embodiments, the pretreatment device 4 further includes a filter device 43 for filtering particles in the fluid medium to be tested. In this embodiment, the fluid medium (water sample) to be measured at the top of the fractionating tower 6 is pretreated by the filtering device 43 of the pretreatment device 4, the fluid medium (water sample) to be measured after the particulate matter is removed by filtration enters the online measurement system 1 for data measurement, thereby avoiding the particulate matter from affecting the measurement accuracy of the online measurement system or preventing the particulate matter from damaging the online measurement system 1, ensuring that the online measurement system 1 can realize real-time and accurate online measurement of the pH value, chloride ion, iron ion, sulfide and ammonia nitrogen content, effectively monitoring the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device for a long time, guiding the oil refining device to adjust the corrosion prevention measures in time, and preventing and controlling the corrosion risk at the top of the fractionating tower 6 of the oil refining device in time. In some embodiments, the filter membrane of the filter device 43 may have a pore size of 0.4 μm, 0.8 μm, 80 μm, etc., so as to select filter devices 43 with filter membranes having different pore sizes according to actual filtering requirements, thereby achieving good filtering and removing effects on particles in the fluid medium (water sample) to be measured.
Referring to fig. 2, in some embodiments, the system for monitoring corrosion risk at the top of the fractionating tower of the oil refining plant further includes an explosion-proof system 5, and the online measurement system 1 and the pretreatment device 4 are both disposed in the explosion-proof system 5. In this embodiment, the on-line measurement system 1 and the pretreatment device 4 are both disposed in the explosion-proof system 5, so as to ensure the safety, stability and long-term effectiveness of the operation of the on-line measurement system and the pretreatment device 4, thereby ensuring that the on-line measurement system 1 can realize real-time accurate on-line measurement of the pH value, the chloride ion, the iron ion, the sulfide and the ammonia nitrogen content, and can effectively monitor the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device for a long time, so as to guide the oil refining device to adjust the anti-corrosion measure in time, and timely prevent and control the corrosion risk at the top of the fractionating tower 6 of the oil refining device.
Referring to fig. 2, in some embodiments, the explosion-proof system 5 is a positive pressure inflatable explosion-proof cabin, and the online measurement system 1 and the preprocessing device 4 are both disposed in the positive pressure inflatable explosion-proof cabin. In this embodiment, the explosion-proof system 5 adopts a positive pressure inflatable explosion-proof cabin, and the online measurement system 1 and the pretreatment device 4 are both arranged in the positive pressure inflatable explosion-proof cabin, and because the explosion-proof level of the positive pressure inflatable explosion-proof cabin reaches Exib II BT4GB, the explosion-proof effect is better, so as to fully ensure the safety, stability and long-term effectiveness of the operation of the online measurement system and the pretreatment device 4.
Referring to fig. 2, in some embodiments, the on-line measurement system 1 is disposed near the top of the fractionating tower 6 at the position of the water drum in the condensing tank 7, and the on-line measurement system 1 is disposed in the positive pressure aeration explosion-proof small room. In the embodiment, the online measuring system 1 is arranged at the position of a water drum 7 at the top of a condensing tank 6 at the top of a fractionating tower 6 of an oil refining device, so that the online measuring system 1 can simultaneously perform online monitoring on the pH value of a fluid medium at the top of the fractionating tower 6 and the content of a corrosive medium in the fluid medium, and the online measuring system 1 is arranged in a positive pressure inflatable explosion-proof cabin, and the explosion-proof level of the positive pressure inflatable explosion-proof cabin reaches Exib II BT4GB, so that the explosion-proof effect is good, and the safety, stability and long-term effectiveness of the operation of the online measuring system are fully ensured. Because the explosion-proof system 5 is internally provided with the pretreatment device 4, and the pretreatment device 4 comprises the temperature control device 41, the pressure regulating device 42 and the filtering device 43, the pretreatment device 4 has the functions of regulating the temperature and the pressure and filtering, can regulate the temperature and the pressure of the water sample to normal temperature and normal pressure and filter and remove particulate matters, meets the measurement requirements of a linear monitoring instrument of the online measurement system 1, and improves the accuracy of the quantity of the online measurement system 1.
Referring to fig. 1 and fig. 2 in combination, in some embodiments, the data processing system 3 includes a cloud platform 31 for being disposed in a remote control center and a mobile terminal 32 in communication connection with the cloud platform 31, and the mobile terminal 32 can receive real-time monitoring information processed by the cloud platform 31 and send out early warning information. In this embodiment, the data processing system 3 includes a cloud platform 31 and a mobile terminal 32 in communication connection with the cloud platform 31, and the cloud platform 31 is in communication connection with the data acquisition unit 22 in a wireless/wired manner, so that the cloud platform 31 can receive real-time monitoring data transmitted by the data acquisition unit 22 in real time and perform real-time processing and analysis on the received real-time monitoring data. The cloud platform 31 arranged in the remote control center can display the real-time monitoring information according to the processing and analyzing result of the real-time monitoring data after the received real-time monitoring data is processed and analyzed in real time, so as to send out early warning information when the pH value of the fluid medium at the top of the fractionating tower 6 and/or the content of the corrosive medium in the fluid medium is abnormal. The mobile terminal 32 can receive real-time monitoring information processed by the cloud platform 31 of the remote control center and sent early warning information, can monitor the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device and the content of each corrosion factor in the fluid medium in real time for a long time, can evaluate the corrosion risk at the top of the fractionating tower 6 of the oil refining device in time, and can further guide the oil refining device to adjust the corrosion prevention measures in time and reduce the corrosion risk. It is understood that the mobile terminal 32 may be a mobile phone with an APP end or a smart phone with multiple application functions, a tablet computer, and the like.
Referring to fig. 1 and 2 in combination, in some embodiments, the data processing system 3 further includes a computer 33 communicatively connected to the cloud platform 31 and having a PC end, where the computer 33 having the PC end is used to install a monitoring point set at a detection site. In this embodiment, the computer 33 is installed at a monitoring point set at a detection site, and the computer 33 having a PC end is in communication connection with the cloud platform 31 of the remote control center, so that a monitoring person at the detection site can receive real-time monitoring information processed by the cloud platform 31 of the remote control center and sent early warning information in real time through the computer 33, can monitor the pH value of the fluid medium at the top of the fractionating tower 6 of the oil refining device and the content of each corrosion factor in the fluid medium in real time for a long time, can evaluate the corrosion risk at the top of the fractionating tower 6 of the oil refining device in time, and can further guide the oil refining device to adjust the corrosion prevention measures in time, thereby reducing the corrosion risk. Of course, the mobile terminal 32 may also receive, through the computer 33, the real-time monitoring information and the early warning information sent by the remote control center cloud platform 31 in real time.
Example 1
Referring to fig. 1 and fig. 2, an atmospheric fractionating tower 6 of an atmospheric and vacuum distillation unit is provided with a corrosion risk monitoring system of a fractionating tower top of an oil refining device, which comprises an online measuring system 1, a data acquisition system 2, a data processing system 3 and an explosion-proof system 5. An online pH meter 11 in the online measurement system 1 selects an anti-sulfide poisoning sensor; the online chloride ion measuring instrument 12 adopts a chloride ion selective electrode method, and the measuring range is 0-500 mg/L; the on-line iron ion measuring instrument 13 adopts a phenanthroline spectrophotometry, and the measuring range is 0-8 mg/L; the online sulfide measuring instrument 14 adopts a sulfur ion indicating electrode titration method, and the measuring range is 0-500 mg/L; the on-line ammonia nitrogen measuring instrument 15 adopts a gas-sensitive electrode method, and the measuring range is 0-1000 mg/L. The online measuring system 1 is connected with the preprocessing device 4, arranged in an explosion-proof small room and arranged at the position of a water drum 7 of a condensing tank at the top of an atmospheric fractionating tower 6. The water sample is subjected to temperature and pressure regulation to normal temperature and normal pressure by the pretreatment device 4, and enters the online measurement system 1 for data measurement after particulate matters are filtered and removed. The online measurement system 1 is connected with the data acquisition unit through 5 RS485 channels, measured pH value, chloride ion content, iron ion content, sulfide content and ammonia nitrogen content are collected through the data acquisition system 2 and then transmitted to the data processing system 3 in a wireless mode, the data processing system 3 realizes display, statistical analysis, monitoring and early warning and the like of monitoring data, and online monitoring of corrosion risks at the top of the atmospheric fractionating tower 6 is realized.
According to the oil refining device fractionating tower top corrosion risk monitoring system provided by the embodiment of the invention, in the process of monitoring corrosion risk at the top of the atmospheric fractionating tower 6 of a certain oil refining device, the monitoring data of condensed water at the top of the atmospheric fractionating tower 6 under normal conditions show that the pH value is 6.8-7.2, the content of chloride ions is 20.5-26.7 mg/L, the content of iron ions is 0.10-0.36 mg/L, the content of sulfide is 30.8-42.4 mg/L, the content of ammonia nitrogen is 34.5-56.6 mg/L, the operation of the atmospheric fractionating tower 6 is normal, and the corrosion risk is low. When the corrosion risk monitoring system for the fractionating tower top of the oil refining device provided by the embodiment of the invention monitors that the content of the corrosion medium exceeds the standard within a certain period of time, for example, the pH value is 5.17 at the lowest, the content of the chloride ion is 150.72mg/L at the highest, the content of the iron ion continuously exceeds the standard and reaches 4.58mg/L at the highest, the content of the iron ion exceeds the early warning value set by the data processing system 3, the data processing system 3 continuously gives an alarm, and the corrosion risk level is high. Aiming at the corrosion risk discovered in the process of monitoring the top of the atmospheric fractionating tower 6, corresponding measures are taken in time, firstly, the content of a corrosion medium is controlled from the source, and the chlorine content of the crude oil is controlled below 3mg/kg by adjusting the crude oil mixing scheme; and secondly, changing the water injection at the tower top from the original reuse water into desalted water, increasing the water injection amount, controlling the pH value of condensed water at the tower top to be 6.5-8.5, and controlling the content of chloride ions to be below 30 mg/L. After the adjustment of the measures, the iron ion content of the condensed water at the top of the fractionating tower of the oil refining device is reduced to 0.34mg/L, so that the corrosion at the top of the atmospheric fractionating tower 6 is effectively controlled. Therefore, the oil refining device fractionating tower top corrosion risk monitoring system provided by the embodiment of the invention can monitor the corrosion risk of the fractionating tower 6 tower top on line, can find the abnormal condition of the corrosion medium in time and send out early warning, realize the monitoring of the corrosion risk and guide the timely adjustment of anticorrosion measures, control the corrosion risk and ensure the safe long-period operation of equipment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A system for monitoring corrosion risk of a fractionating tower top of an oil refining device is characterized by comprising:
the online measurement system is used for online monitoring the pH value of the fluid medium at the top of the fractionating tower and the content of the corrosive medium in the fluid medium;
the data acquisition system is electrically connected with the online measurement system and comprises a data acquisition unit for acquiring real-time monitoring data acquired by online monitoring of the online measurement system in real time and a data transmission unit for transmitting the real-time monitoring data acquired by the data acquisition unit in real time in a wireless/wired mode; the data processing system is in communication connection with the data transmission unit and is used for receiving the real-time monitoring data transmitted by the data transmission unit in real time and carrying out real-time processing analysis on the received real-time monitoring data, and the data processing system can display real-time monitoring information according to the processing and analyzing result of the real-time monitoring data so as to send out early warning information when the pH value of the fluid medium at the top of the fractionating tower and/or the content of a corrosive medium in the fluid medium are abnormal;
the online measuring system comprises an online pH meter for measuring the pH value of the fluid medium in real time, an online chloride ion measuring instrument for measuring the content of chloride ions in the fluid medium in real time, an online iron ion measuring instrument for measuring the content of iron ions in the fluid medium in real time, an online sulfide measuring instrument for measuring the content of sulfide in the fluid medium in real time, and an online ammonia nitrogen measuring instrument for measuring the content of ammonia nitrogen in the fluid medium in real time.
2. The refinery apparatus fractionation tower top corrosion risk monitoring system of claim 1, wherein the online pH is a pH sensor resistant to sulfide poisoning.
3. The system for monitoring corrosion risk at the top of the fractionating tower of an oil refinery of claim 1, wherein said system for monitoring corrosion risk at the top of the fractionating tower of an oil refinery further comprises a pretreatment device for pretreating a fluid medium to be tested at the top of said fractionating tower, said pretreatment device comprising a temperature control device for controlling and adjusting the temperature of said fluid medium to be tested.
4. The refinery apparatus fractionation tower top corrosion risk monitoring system of claim 3, wherein the pretreatment apparatus further comprises a pressure regulating apparatus for controlling and regulating a fluid pressure of the fluid medium to be measured.
5. The system for monitoring the corrosion risk of the fractionation tower top of an oil refinery of claim 3, wherein said pretreatment device further comprises a filtering device for filtering particulate matter in said fluid medium to be tested.
6. The system for monitoring corrosion risk at the top of the fractionating tower of an oil refining plant according to claim 3, wherein said system for monitoring corrosion risk at the top of the fractionating tower of an oil refining plant further comprises an explosion-proof system, and said on-line measuring system and said pretreatment device are both disposed in said explosion-proof system.
7. The system for monitoring corrosion risk at the top of the fractionating tower of an oil refining apparatus according to claim 6, wherein said explosion-proof system is a positive pressure inflatable explosion-proof cabin, and said on-line measurement system and said pretreatment apparatus are both disposed in said positive pressure inflatable explosion-proof cabin.
8. The system for monitoring corrosion risk at the top of the fractionating tower of claim 1, wherein said on-line measuring system is located adjacent to a condensate drum at the top of said fractionating tower.
9. The system for monitoring corrosion risk at the top of the fractionating tower of an oil refining apparatus according to any one of claims 1 to 8, wherein the data processing system comprises a cloud platform for being disposed in a remote control center and a mobile terminal in communication connection with the cloud platform, and the mobile terminal can receive real-time monitoring information processed by the cloud platform and send out early warning information.
10. The refinery apparatus fractionation tower top corrosion risk monitoring system of claim 9, wherein the data processing system further comprises a computer communicatively connected to the cloud platform, the computer being configured to be installed at a monitoring point located at a detection site.
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