Slurry oil heat exchanger scaling early warning method, device and equipment, medium and descaling system

Abstract

The invention provides an oil slurry heat exchanger scaling early warning method, device and equipment, a medium and a descaling system, and belongs to the field of heat exchanger scaling prediction.The early warning method comprises the steps that operation parameters of an oil slurry heat exchanger are obtained; determining an actual total heat transfer coefficient and actual heat exchange efficiency based on the operation parameters of the slurry oil heat exchanger; based on the actual total heat transfer coefficient and the actual heat exchange efficiency, a scaling early warning index is determined; and generating scaling early warning information based on a comparison result of the scaling early warning index and the scaling early warning threshold value. The early warning device comprises a data acquisition unit, a data processing unit, an early warning index determination unit and an early warning information generation unit; the descaling system comprises a cleaning device, a control device and early warning equipment. Through the method provided by the invention, a more accurate early warning scaling condition can be obtained, and the operation reliability of the oil slurry heat exchanger is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchanger scaling prediction, and in particular to an oil-slurry heat exchanger scaling early warning method, an oil-slurry heat exchanger scaling early warning device, an oil-slurry heat exchanger scaling early warning equipment, a computer-readable storage medium and an oil-slurry heat exchanger online descaling system. Background Art

[0002] In the production of petrochemical enterprises, heat exchangers are important equipment for heat exchange between material media, and scaling on their heat exchange surfaces is an important factor affecting the energy consumption and equipment maintenance costs of enterprises. Especially for important heat exchangers that play a key role in production units, scaling on their surfaces will directly affect the long-term operation of the entire unit. For example, the oil-slurry heat exchanger is the most important heat exchange equipment in the catalytic cracking unit. On the one hand, it generates high-pressure steam to provide steam heat source for other units, and on the other hand, it stabilizes the operation of the oil-slurry system and ensures the stability of the unit. In fact, after an average of about 12 months of operation, the oil-slurry heat exchanger will experience very serious scaling, resulting in low heat exchange efficiency. Therefore, early warning of heat exchanger scaling and online descaling are one of the important goals that production and operation units urgently need to solve.

[0003] In the prior art, conventional heat exchanger fouling detection and early warning methods are mainly through establishing a fouling early warning model and determining the degree of blockage in the heat exchanger tube through theoretical analysis; or by monitoring the system parameters of the heat exchanger such as fouling thermal resistance, inlet and outlet pressures and mass flow, and when it is determined that the system parameters exceed the upper and lower limits, it is considered that fouling exists.

[0004] For example, a Chinese patent document with a publication date of July 1, 2022 and a publication number of CN114692322A proposes a method for monitoring fouling of a heavy oil heat exchanger, the method comprising: collecting process data stored in an enterprise database; and collecting laboratory analysis data of a target system in an enterprise analysis system; performing data correction on the process data through a data correction model; constructing a heat exchanger calculation model using the detailed structural parameters of the target heat exchanger, and calculating the fouling thermal resistance of the target heat exchanger by inputting the verified process data; constructing a fouling prediction model based on the critical fouling theory; conducting a correlation analysis on the degree of fouling and the factors causing fouling, and obtaining the correlation coefficients of the factors causing fouling; and constructing a blockage state analysis model of the target heat exchanger using the inlet and outlet pressure drop of the tube as an evaluation index and determining the degree of blockage of the target heat exchanger tube.

[0005] A Chinese patent document with a publication date of February 22, 2017 and a publication number of CN106446318A proposes a method for identifying fouling of a plate-fin heat exchanger, the method comprising: receiving a subsystem model via a processor, the subsystem model comprising system parameters for a heat exchanger, wherein each of the system parameters comprises a sensor variance; determining a test design vector based on one or more of the system parameters via the processor; and designing a built-in test based on the test design vector via the processor.

[0006] A Chinese patent document with a publication date of May 24, 2017 and a publication number of CN106710162A proposes a boiler gallbladder scaling early warning method based on a decision tree system, comprising the following steps: step (1), obtaining boiler room environment and boiler operating parameter data A, then obtaining boiler gallbladder scaling critical value B, and establishing a gallbladder scaling error rate table T; step (2): establishing a decision tree system, establishing a control system, and logically matching the decision tree system with the control system; step (3): an electronic sensor obtains real-time boiler gallbladder data and transmits it to the decision tree system to obtain a high and low value probability P of gallbladder scaling; step (4): if P is greater than 0.8, the boiler gallbladder scaling is higher than the gallbladder scaling critical value, and the central control console gives an alarm prompt; step (5): the boiler staff confirms the alarm prompt issued by the central control console. If the boiler gallbladder is scaled after confirmation, it means that the decision tree system has made an error in judgment, and the decision tree system is corrected.

[0007] A Chinese patent document with a publication date of January 10, 2023 and publication number CN115585698A proposes a forced circulation heat exchanger scaling monitoring and early warning and ultrasonic online self-degradation method, the method comprising: a control system obtains the energy utilization rate η of the forced circulation heat exchanger; when η≤η lower limit, the central data processor sends an instruction to the ultrasonic generator, and the ultrasonic generator starts after receiving the instruction sent by the central data processor. The ultrasonic generator generates a high-frequency alternating current signal, which is then input into the ultrasonic probe, so that the ultrasonic probe generates ultrasonic waves and acts on the heat exchange tube wall of the forced circulation heat exchanger. Under the action of ultrasonic waves, the scale on the wall of the forced circulation heat exchanger is gradually destroyed, broken and fallen off, so as to improve the efficiency of the forced circulation heat exchanger.

[0008] Although these existing scaling warning technical solutions can determine the scaling situation, the operation process is very cumbersome, and most of them are used to determine the scale blockage in the heat exchanger, and cannot satisfy the actual scaling degree of the slurry in the slurry heat exchanger. Therefore, it is necessary to form a scaling warning method specifically for slurry heat exchangers. Summary of the invention

[0009] In view of the technical problem that the existing technology cannot accurately judge the actual scaling degree of the oil slurry in the oil-slurry heat exchanger, the present invention provides a scaling early warning method for a slurry heat exchanger. This method can obtain more accurate early warning scaling conditions, making it easier for staff to understand the scaling trend of the oil-slurry heat exchanger in a timely manner.

[0010] In view of the technical problem that the prior art lacks automated descaling facilities for oil-slurry heat exchangers, the present invention provides an online descaling system for oil-slurry heat exchangers, which can automatically clean the scale generated by the oil-slurry heat exchanger and improve the operating reliability of the production equipment of petrochemical enterprises.

[0011] To achieve the above-mentioned purpose, the first aspect of the present invention provides a method for early warning of fouling of an oil-slurry heat exchanger, the early warning method comprising the following steps: obtaining operating parameters of the oil-slurry heat exchanger; determining an actual total heat transfer coefficient and an actual heat transfer efficiency based on the operating parameters of the oil-slurry heat exchanger; determining a fouling early warning index based on the actual total heat transfer coefficient and the actual heat transfer efficiency; and generating fouling early warning information based on a comparison result between the fouling early warning index and a fouling early warning threshold.

[0012] In an exemplary embodiment of the present invention, the scaling warning index may include a first scaling warning index and a second scaling warning index; determining the scaling warning index based on the actual total heat transfer coefficient and the actual heat exchange efficiency may include: determining the ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient as the first scaling warning index; and determining the ratio of the actual heat exchange efficiency to the standard heat exchange efficiency as the second scaling warning index.

[0013] In an exemplary embodiment of the present invention, the generation of scaling warning information based on the comparison result of the scaling warning indicator and the scaling warning threshold may include: when it is determined that the first scaling warning indicator and the second scaling warning indicator are both greater than the second scaling warning threshold, generating normal operation prompt information; when it is determined that the first scaling warning indicator and the second scaling warning indicator are both between the first scaling warning threshold and the second scaling warning threshold, generating scaling risk prompt information; when it is determined that the first scaling warning indicator and the second scaling warning indicator are both less than the first scaling warning threshold, generating severe scaling warning information; wherein the scaling warning threshold includes the first scaling warning threshold and the second scaling warning threshold, and the first scaling warning threshold is less than the second scaling warning threshold; the scaling warning information includes normal operation prompt information, scaling risk prompt information and severe scaling warning information.

[0014] A second aspect of the present invention provides a fouling warning device for an oil-slurry heat exchanger, the warning device comprising a data acquisition unit, a data processing unit, a warning index determination unit and a warning information generation unit; the data acquisition unit is used to acquire the operating parameters of the oil-slurry heat exchanger; the data processing unit is used to determine the actual total heat transfer coefficient and the actual heat transfer efficiency based on the operating parameters of the oil-slurry heat exchanger; the warning index determination unit is used to determine the fouling warning index based on the actual total heat transfer coefficient and the actual heat transfer efficiency; the warning information generation unit is used to generate fouling warning information based on the comparison result of the fouling warning index and the fouling warning threshold.

[0015] In another exemplary embodiment of the present invention, the early warning indicator determination unit may include a first early warning indicator determination module and a second early warning indicator determination module; the first early warning indicator determination module is used to determine the ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient as the first fouling early warning indicator; the second early warning indicator determination module is used to determine the ratio of the actual heat exchange efficiency to the standard heat exchange efficiency as the second fouling early warning indicator.

[0016] In another exemplary embodiment of the present invention, the warning information generation unit may include a first warning information generation module, a second warning information generation module and a third warning information generation module; the first warning information generation module is used to generate normal operation prompt information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both greater than the second scaling warning threshold; the second warning information generation module is used to generate scaling risk prompt information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both between the first scaling warning threshold and the second scaling warning threshold; the third warning information generation module is used to generate severe scaling warning information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both less than the first scaling warning threshold; wherein the scaling warning threshold includes the first scaling warning threshold and the second scaling warning threshold, and the first scaling warning threshold is less than the second scaling warning threshold; the scaling warning information includes normal operation prompt information, scaling risk prompt information and severe scaling warning information.

[0017] A third aspect of the present invention provides an oil-slurry heat exchanger scaling early warning device, the early warning device comprising a processor and a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by one or more of the above processors so that the early warning device implements the above-mentioned oil-slurry heat exchanger scaling early warning method.

[0018] A fourth aspect of the present invention provides a computer-readable storage medium storing at least one program code, wherein the program code is loaded and executed by a processor so that a computer implements the above-mentioned oil-slurry heat exchanger fouling early warning method.

[0019] A fifth aspect of the present invention provides an online descaling system for an oil-slurry heat exchanger, the descaling system comprising a cleaning device, a control device and the above-mentioned early warning device; the early warning device is used to send scaling early warning information to the control device; the control device is used to determine the scaling risk level based on the scaling early warning information, and generate a control instruction corresponding to the scaling risk level; the cleaning device is used to respond to the control instruction and pass a predetermined amount of oil-slurry purifier into the oil-slurry heat exchanger.

[0020] In yet another exemplary embodiment of the present invention, the control instructions may include an oil slurry purification temperature control instruction, an oil slurry purification time control instruction, and an oil slurry purification concentration control instruction.

[0021] Through the technical solution provided by the present invention, the present invention has at least the following technical effects:

[0022] (1) The oil-slurry heat exchanger scaling early warning method and device of the present invention can analyze the scaling trend of the oil-slurry heat exchanger and issue an alarm, which can not only obtain more accurate early warning scaling conditions, but also help the staff to understand the scaling trend of the oil-slurry heat exchanger in a timely manner;

[0023] (2) The online descaling system for the oil-slurry heat exchanger of the present invention can timely remove dirt on the surface of the heat exchanger and improve the heat exchange efficiency;

[0024] (3) The use of the descaling system and early warning device of the present invention can improve the operating reliability of the oil-slurry heat exchanger and the production equipment of the petrochemical enterprise, and reduce the energy consumption and production cost of the petrochemical enterprise.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0027] Figure 1 A schematic flow chart of a method for early warning of fouling of an oil-slurry heat exchanger provided in accordance with a second embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of a fouling warning device for an oil-slurry heat exchanger provided in a third embodiment of the present invention;

[0029] Figure 3 A schematic structural diagram of an oil-slurry heat exchanger scaling warning device provided in a fourth embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] 101 - data acquisition unit, 102 - data processing unit, 103 - warning indicator determination unit, 104 - warning information generation unit, 201 - processor, 202 - memory. DETAILED DESCRIPTION

[0032] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the present invention, “first”, “second”, etc. are merely used for convenience of description and distinction and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection, or an indirect connection; it can be a wired connection, or a wireless connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] Embodiment 1

[0038] The first embodiment of the present invention provides a method for early warning of fouling of an oil-slurry heat exchanger, the method comprising the following steps:

[0039] Step S101: obtaining the operating parameters of the oil-slurry heat exchanger.

[0040] Here, the operating parameters of the oil-slurry heat exchanger may include the flow rate of the inlet material, the temperature of the inlet material, the flow rate of the outlet material, the temperature of the outlet material, and the operating pressure, etc. The operating parameters of the oil-slurry heat exchanger can be collected by monitoring instruments installed on the inlet and outlet sides of the oil-slurry heat exchanger.

[0041] Step S102: Determine the actual total heat transfer coefficient and the actual heat exchange efficiency based on the operating parameters of the oil-slurry heat exchanger.

[0042] Step S103: Determine a fouling warning index based on the actual total heat transfer coefficient and the actual heat exchange efficiency.

[0043] Step S104: generating scaling warning information based on the comparison result between the scaling warning index and the scaling warning threshold.

[0044] Further, in a possible implementation, the scaling warning index may include a first scaling warning index and a second scaling warning index. In step S103, based on the actual total heat transfer coefficient and the actual heat exchange efficiency, the process of determining the scaling warning index includes but is not limited to the following sub-steps S1031 to S1033.

[0045] Sub-step S1031: Determine the standard total heat transfer coefficient and standard heat exchange efficiency based on the design parameters of the slurry heat exchanger.

[0046] Sub-step S1032: Determine the ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient as the first scaling warning indicator.

[0047] Sub-step S1033: Determine the ratio of the actual heat exchange efficiency to the standard heat exchange efficiency as the second fouling warning indicator.

[0048] Here, the actual total heat transfer coefficient and the standard total heat transfer coefficient can be calculated according to formulas (1) to (3), and the actual heat transfer efficiency and the standard heat transfer efficiency can be calculated according to formulas (4) to (6).

[0049] Q h =W h ×C ph ×(T 11 -T 12 ) (1)

[0050] Q c =W c ×C pc ×(T 21 -T 22 ) (2)

[0051]

[0052]

[0053]

[0054]

[0055] In the formula, C ph is the specific heat capacity of the hot fluid, J / (kg·℃); C pc is the specific heat capacity of the cold fluid, J / (kg·℃); T 11 is the inlet temperature of the hot fluid, °C; T 12 is the inlet temperature of the hot fluid, °C; T 21 is the inlet temperature of the cold fluid, °C; T 22 is the inlet temperature of the cold fluid, °C; W cis the mass flow rate of the cold fluid, kg / s; W h is the mass flow rate of the hot fluid, kg / s; ΔT is the temperature difference of the fluid, °C; Q h is the heat load; Q c is the cold load; A is the surface area, m 2 ; K h is the heat transfer coefficient inside the tube, W / m 2 ·K; K c is the heat transfer coefficient outside the tube, W / m 2 ·K; K 总 is the overall heat transfer coefficient, W / m 2 ·K; η is the heat exchange efficiency.

[0056] Further, in a possible implementation manner, in step S104, the process of generating the fouling warning information based on the comparison result between the fouling warning index and the fouling warning threshold includes but is not limited to the following sub-steps S1041 to sub-step S1043.

[0057] Sub-step S1041: Generate a normal operation prompt message when it is determined that both the first fouling warning index and the second fouling warning index are greater than the second fouling warning threshold.

[0058] Sub-step S1042: Generate a fouling risk prompt message when it is determined that both the first fouling warning index and the second fouling warning index are between the first fouling warning threshold and the second fouling warning threshold.

[0059] Sub-step S1043: Generate a severe fouling warning message when it is determined that both the first fouling warning index and the second fouling warning index are less than the first fouling warning threshold.

[0060] Among them, the fouling warning threshold may include the first fouling warning threshold and the second fouling warning threshold, and the first fouling warning threshold is less than the second fouling warning threshold. The fouling warning information may include a normal operation prompt message, a fouling risk prompt message, and a severe fouling warning message.

[0061] For example, assume that the first fouling warning threshold is denoted as R1, the second fouling warning threshold is denoted as R2, 0 < R1 < R2 < 1, and the first fouling warning index is denoted as K 总实 / K 总标 and the second fouling warning index is denoted as η 实 / η 标 Then, the comparison results between the fouling warning index and the fouling warning threshold will present the 9 situations in Table 1 below.

[0062] As shown in Table 1, when the first scaling warning indicator and the second scaling warning indicator are both greater than the second scaling threshold, it can be considered that the oil-slurry heat exchanger is in good operating condition and there is no scaling risk; when the first scaling warning indicator and the second scaling warning indicator are both less than the first scaling threshold, it can be considered that the oil-slurry heat exchanger is in very poor operating condition and there is serious scaling; when the first scaling warning indicator and the second scaling warning indicator are both greater than or equal to the first scaling warning threshold and less than or equal to the second scaling warning threshold, it can be considered that the oil-slurry heat exchanger is in poor operating condition and there is a certain scaling risk.

[0063] When one of the first scaling warning indicator and the second scaling warning indicator is less than the first scaling warning threshold, while the other indicator is between the first scaling warning threshold and the second scaling warning threshold; or, one of the first scaling warning indicator and the second scaling warning indicator is greater than the second scaling warning threshold, while the other indicator is between the first scaling warning threshold and the second scaling warning threshold, it is considered that it is impossible to directly judge whether the slurry heat exchanger has scaling risk based on the comparison result of the scaling warning indicator and the scaling warning threshold, and the next step of analysis should be carried out in combination with various scaling warning indicators.

[0064] Table 1 Comparison results of 9 scaling warning indicators and scaling warning thresholds

[0065]

[0066] Further, in a possible implementation, when there is a scaling warning indicator that is less than the first scaling warning threshold, and another indicator is between the first scaling warning threshold and the second scaling warning threshold; or, when there is a scaling warning indicator that is greater than the second scaling warning threshold, and another indicator is between the first scaling warning threshold and the second scaling warning threshold, each scaling warning indicator can be further scored, and the weight value of each scaling warning indicator can be determined, and finally, the scaling risk assessment result of the oil-slurry heat exchanger can be calculated according to the score value and weight value of each scaling warning indicator. If the scaling risk assessment result of the oil-slurry heat exchanger is greater than the preset scaling risk critical value at this time, it is considered that the oil-slurry heat exchanger is in good operating condition and there is no scaling risk; if the scaling risk assessment result of the oil-slurry heat exchanger is less than or equal to the preset scaling risk critical value at this time, it is considered that the oil-slurry heat exchanger is in poor operating condition and there is a certain scaling risk.

[0067] If any scaling warning indicator is greater than the first scaling warning threshold and less than the second scaling warning threshold, the deduction value of the scaling warning indicator can be determined based on the difference between the second scaling warning threshold and the scaling warning indicator, and the scoring value of the scaling warning indicator can be determined by subtracting the deduction value from the scoring result corresponding to the second scaling warning threshold.

[0068] If any scaling warning indicator is less than the first scaling warning threshold, the deduction value of the scaling warning indicator can be determined based on the difference between the first scaling warning threshold and the scaling warning indicator, and the scoring value of the scaling warning indicator can be determined by subtracting the deduction value from the scoring result corresponding to the first scaling warning threshold.

[0069] If any scaling warning indicator is greater than the second scaling warning threshold, the bonus value of the scaling warning indicator can be determined based on the difference between the scaling warning indicator and the second scaling warning threshold, and the bonus value can be added to the scoring result corresponding to the second scaling warning threshold to determine the scoring value of the scaling warning indicator.

[0070] For example, assuming that the first scaling warning threshold is 0.6 and the second scaling warning threshold is 0.8, the score value when any scaling warning indicator is equal to 0.6 is recorded as 50 points, and the score value when any scaling warning indicator is equal to 0.8 is recorded as 80 points. Then, when any scaling warning indicator is 0.7, the score value of the scaling warning indicator = 80-(0.8-0.7) × ((80-50) / (0.8-0.6)) = 65 points; when any scaling warning indicator is 0.5, the score value of the scaling warning indicator = 50-(0.6-0.5) × ((50-0) / (0.6-0)) = 41.7 points; when any scaling warning indicator is 0.9, the score value of the scaling warning indicator = 80 + (0.9-0.8) × ((100-80) / (1-0.8)) = 90 points.

[0071] In addition, the weight values ​​of various scaling warning indicators can be determined by analyzing the historical operating data of the slurry heat exchanger.

[0072] Furthermore, in a possible implementation, the real-time calculation result of the scaling warning index can be plotted into a dynamic characteristic curve, and the dynamic characteristic curve can be divided into different scaling risk level areas according to the comparison result between the scaling warning index and the scaling warning threshold, and different scaling risk level areas can be displayed in different colors. In the process of generating scaling warning information, the processed dynamic characteristic curve can be used as part of the generated scaling warning information and sent to the user.

[0073] In addition, the implementation environment of this embodiment includes at least one terminal and a server, and the method is executed on the terminal or the server respectively. The terminal and the server can be connected in communication to realize the interactive transmission of information. For example, the oil-slurry heat exchanger fouling early warning method of this embodiment can be applied to the server, and the collected data of the oil-slurry heat exchanger operating parameters of this embodiment is stored in the terminal, and the server can receive the collected data of the operating parameters sent by the terminal.

[0074] Among them, the terminal can be any electronic product that can interact with the user through one or more methods such as keyboard, touchpad, touch screen, voice interaction, etc., such as PC (Personal Computer), PPC (Pocket Personal Computer), tablet computer, etc.

[0075] The server can be a single server or a server cluster composed of multiple servers. It can also be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN (Content Delivery Network), as well as big data and artificial intelligence platforms.

[0076] Embodiment 2

[0077] The second embodiment of the present invention provides a method for early warning of fouling of a slurry heat exchanger. The following takes the catalytic cracking slurry heat exchanger E214 of a petrochemical company as an example to describe in detail the actual application of the method for early warning of fouling of a slurry heat exchanger of this embodiment. The specific parameters of the slurry heat exchanger E214 are shown in Table 2.

[0078] Table 2 Specific parameters of oil slurry heat exchange E214.

[0079] serial number 0202-E-214 Inner diameter (mm) 1200 Length(mm) 7877.5 Thickness(mm) 14 / 18 / 28 <![CDATA[Volume (m 3 )]]> 8.6 Main material Q245R / 10 <![CDATA[Heat transfer area (m 2 )]]> 500 Temperature(℃) 180、355 <![CDATA[Working pressure P max(Mpa) > 4.12 medium Steam / Slurry Remark Shell side: steam + water; tube side: oil slurry

[0080] Figure 1 The flowchart of the early warning method for oil-slurry heat exchanger fouling is shown. The early warning method may specifically include the following process:

[0081] (1) Collection of operating parameters of slurry heat exchanger.

[0082] Specifically, the flow rate, temperature, operating pressure and other operating parameters of the oil-slurry heat exchanger such as the inlet and outlet material can be transmitted to the data collection center through the data line, and then transmitted to the oil-slurry heat exchanger scaling warning device through the 5G wireless network card. The data collection response time is 5 minutes, and the data is collected every 5 minutes, and all are entered into the data collection center.

[0083] The data collection center includes intelligent data management terminal, switch and 24V power supply. Among them, the intelligent data management terminal is used to collect data from field flow meters, pressure transmitters, and temperature sensors, and complete the functions of data conversion and data processing; the switch is used for data exchange and is industrial grade; the 24V power supply is used to power the system.

[0084] The data collection center also includes a 5G signal wireless communication router and a 5G transmitting antenna. The 5G signal wireless communication router is used for 5G wireless data transmission; the 5G transmitting antenna is used for data transmission and the receiver is used for data reception.

[0085] It should be noted that the inlet and outlet operating pressure units of the oil slurry heat exchanger are Pa, the inlet and outlet flow units are Kg / s, and the inlet and outlet temperatures are °C. The collected operating parameters are shown in Table 3 below.

[0086] Table 3. Operating parameters collected

[0087] Collection point Temperature ℃ Pressure Flow rate Kg / s Shell side import 126.90 148.17 16.16 Shell side export 137.59 171.12 Pipeline import 371.40 170.45 20.84 Pipeline exit 260.83 159.32

[0088] (2) Based on the real-time data collected from the oil-slurry heat exchanger operating parameters, the actual total heat transfer coefficient and actual heat transfer efficiency are automatically calculated.

[0089] In order to facilitate continuous observation of the operating status of the oil-slurry heat exchanger, the scattered data of the actual total heat transfer coefficient and the actual heat transfer efficiency can be plotted into a corresponding dynamic characteristic curve.

[0090] It should be noted that the collected operating parameters should be corrected before automatic calculation of the actual total heat transfer coefficient and the actual heat exchange efficiency.

[0091] (3) Calculate the standard total heat transfer coefficient and standard heat transfer efficiency when designing the slurry heat exchanger.

[0092] (4) Determine the scaling warning indicators.

[0093] Among them, the first scaling warning indicator is the ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient, that is, K 总实 / K 总标 The second fouling warning indicator is the ratio of the actual heat transfer efficiency to the standard heat transfer efficiency, that is, η 实 / η 标 .

[0094] (5) Generate scaling warning information based on the comparison result between the scaling warning index and the scaling warning threshold.

[0095] According to K 总实 / K 总标 , η 实 / η 标 The dynamic characteristic curve is drawn to determine the warning situation, which is divided into the following aspects:

[0096] i) When K 总实 / K 总标 and η 实 / η 标When both are greater than 0.80, it indicates that the oil-slurry heat exchanger is operating normally. At this time, the warning device displays a green sign and does not send warning information;

[0097] ii) When K 总实 / K 总标 and η 实 / η 标 When both are less than 0.80 and greater than 0.60, it indicates that the oil-slurry heat exchanger has a scaling tendency and needs to be inspected more frequently. At this time, the warning device displays a yellow sign and does not send warning information, but sends reminder information every week.

[0098] iii) When K 总实 / K 总标 and η 实 / η 标 When it is less than 0.60, it means that the scaling of the oil-slurry heat exchanger is more obvious and needs to be dealt with. At this time, the early warning device displays a red sign and the early warning information is sent to the person in charge of the production unit.

[0099] (6) Transmission of early warning information.

[0100] After the scaling warning is reached, the warning device will 总实 / K 总标 , η 实 / η 标 The dynamic characteristic curve generates early warning information and transmits it to the person in charge of the production device, and issues an alarm signal.

[0101] Since the start of operation, the K of the oil slurry heat exchanger E214 总实 / K 总标 , η 实 / η 标 The ratio is relatively stable, fluctuating between 0.80 and 0.90, and the early warning equipment always displays a green sign, indicating stable operation.

[0102] After 11 months of operation, K 总实 / K 总标 and η 实 / η 标 The ratio starts to be less than 0.80, but is greater than 0.60. The early warning device keeps showing a yellow sign, indicating that the operating conditions have changed, there is a slight scaling trend, and increased inspection is required.

[0103] After 5 months of operation, K 总实 / K 总标 and η 实 / η 标 The ratio is close to 0.60, indicating that the scaling of the slurry heat exchanger is significantly accelerated, and the early warning equipment displays a yellow sign.

[0104] After 3 months of operation, K 总实 / K总标 and η 实 / η 标 The ratio is less than 0.60, indicating that the oil-slurry heat exchanger is seriously fouled. The early warning device displays a red sign and immediately sends the early warning information to the person in charge of the device.

[0105] Embodiment 3

[0106] The third embodiment of the present invention provides a fouling warning device for a slurry heat exchanger, such as Figure 2 As shown, the early warning device includes a data acquisition unit 101, a data processing unit 102, an early warning indicator determination unit 103 and an early warning information generation unit 104.

[0107] Specifically, the data acquisition unit 101 is used to acquire the operating parameters of the oil-slurry heat exchanger.

[0108] The data processing unit 102 is connected to the data acquisition unit 101 and is used to determine the actual total heat transfer coefficient and the actual heat exchange efficiency based on the operating parameters of the oil-slurry heat exchanger.

[0109] The early warning index determination unit 103 is connected to the data processing unit 102 and is used to determine the fouling early warning index based on the actual total heat transfer coefficient and the actual heat exchange efficiency.

[0110] The warning information generating unit 104 is connected to the warning index determining unit 103, and is used to generate scaling warning information based on the comparison result between the scaling warning index and the scaling warning threshold.

[0111] Further, in a possible implementation, the early warning indicator determination unit may include a first early warning indicator determination module and a second early warning indicator determination module. The first early warning indicator determination module is used to determine the ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient as the first fouling early warning indicator. The second early warning indicator determination module is used to determine the ratio of the actual heat exchange efficiency to the standard heat exchange efficiency as the second fouling early warning indicator.

[0112] Further, in a possible implementation, the warning information generation unit may include a first warning information generation module, a second warning information generation module, and a third warning information generation module. The first warning information generation module is used to generate normal operation prompt information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both greater than the second scaling warning threshold. The second warning information generation module is used to generate scaling risk prompt information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both between the first scaling warning threshold and the second scaling warning threshold. The third warning information generation module is used to generate severe scaling warning information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both less than the first scaling warning threshold.

[0113] It should be noted that the scaling warning threshold includes a first scaling warning threshold and a second scaling warning threshold, and the first scaling warning threshold is less than the second scaling warning threshold. The scaling warning information includes normal operation prompt information, scaling risk prompt information and severe scaling warning information.

[0114] It should also be noted that the early warning device provided above only uses the division of the above functional modules as an example to illustrate when realizing its functions. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the early warning device provided in the above embodiment and the early warning method provided in the first and second embodiments belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0115] Embodiment 4

[0116] The fourth embodiment of the present invention provides a fouling warning device for a slurry heat exchanger, see Figure 3 The early warning device includes a processor 201 and a memory 202, in which at least one computer program is stored. The at least one computer program is loaded and executed by one or more of the above-mentioned processors so that the early warning device implements the above-mentioned oil-slurry heat exchanger fouling early warning method.

[0117] Of course, the early warning device may also have components such as a wired or wireless network interface, a keyboard, and an input / output interface for input and output. The early warning device may also include other components for realizing various functions of the device, which will not be elaborated here.

[0118] The fourth embodiment of the present invention further provides a computer-readable storage medium, in which at least one program code is stored. The program code is loaded and executed by a processor to enable a computer to implement the oil-slurry heat exchanger fouling early warning method as described above.

[0119] Alternatively, the computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The storage medium may be any available medium that can be accessed by a general or special purpose computer.

[0120] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0121] Embodiment 5

[0122] The fifth embodiment of the present invention provides an online descaling system for an oil-slurry heat exchanger, the descaling system comprising a cleaning device, a control device and the early warning device in the fourth embodiment.

[0123] Specifically, the early warning device is used to send scaling early warning information to the control device.

[0124] The control device is connected to the early warning device, and is used to determine the scaling risk level based on the scaling early warning information, and generate control instructions corresponding to the scaling risk level. In other words, the control device can score the scaling early warning index based on the comparison result between the scaling early warning index and the scaling early warning threshold; then determine the scaling risk assessment result of the scaling early warning index based on the score value and weight value of the scaling early warning index; finally, determine the scaling risk level by comparing the scaling risk assessment result with the preset scaling risk critical value. The control device can further determine the oil slurry purification temperature control range, oil slurry purification time control range and oil slurry purification concentration control range corresponding to the scaling risk level according to the determined scaling risk level, and then generate the oil slurry purification temperature control instruction, oil slurry purification time control instruction and oil slurry purification concentration control instruction corresponding to the scaling risk level.

[0125] For example, the control device may include a scaling risk assessment module, a comparison module, a scaling risk level determination module, and a control instruction generation module. The scaling risk assessment module is used to determine the scaling risk assessment result of the scaling warning indicator according to the score value and weight value of the scaling warning indicator. The comparison module is used to compare the scaling risk assessment result with the preset scaling risk critical value. The scaling risk level determination module is used to determine the scaling risk level according to the comparison result of the scaling risk assessment result with the preset scaling risk critical value. The control instruction generation module is used to generate a control instruction corresponding to the scaling risk level.

[0126] The cleaning device is connected to the early warning device and the oil-slurry heat exchanger respectively, and is used for responding to the control instruction to pass a predetermined amount of oil-slurry purifier into the oil-slurry heat exchanger.

[0127] For example, the cleaning device can be set as a closed cleaning machine, which can adopt a single-tank structure with a dual-circulation pump group, with one pump in use and one pump in standby or dual pumps running simultaneously. In other words, the outlet of the closed cleaning machine can be connected to the inlet drain of the oil-slurry heat exchanger through the dual-circulation pump group, and the connecting pipelines between the closed cleaning machine and the dual-circulation pump group and the oil-slurry heat exchanger can adopt a one-way circulation flushing pipeline connection method or a self-circulation pipeline connection method. In addition, the outlet of the closed cleaning machine can be connected in series with two groups of circulation pumps respectively, or can be connected in parallel with two groups of circulation pumps. The outlet drain of the oil-slurry heat exchanger is connected to the closed tank, the diesel pipeline of the production unit is connected to the closed tank, and the sewage outlet at the bottom of the closed tank is connected to the sewage pipeline of the production unit.

[0128] Furthermore, in a possible implementation manner, the control device may determine the oil slurry purification temperature control range to 100-150°C, the oil slurry purification time control range to 10-48h, and the oil slurry purification concentration control range to 1-8% based on the scaling risk assessment of the oil slurry heat exchanger.

[0129] Furthermore, in another possible implementation, the control device may determine the oil slurry purification temperature control range to 100-130°C, the oil slurry purification time control range to 10-24h, and the oil slurry purification concentration control range to 1-5% based on the scaling risk assessment of the oil slurry heat exchanger.

[0130] Furthermore, in a possible embodiment, the oil slurry purifier can be compounded from a plurality of organic hydrocarbon components, wherein the organic hydrocarbon components include at least three of solvent oil, pentadiene, Span surfactants, AEO surfactants and pine oil.

[0131] After the oil-slurry heat exchanger scaling warning information in this embodiment is issued, the production device can immediately start the online descaling system to promptly remove the scale on the heat exchanger surface, improve the heat exchange efficiency, and ensure the long-term operation of the production device. In addition, the online descaling system of this embodiment has strong versatility and can be considered for use on similar oil-slurry heat exchangers.

[0132] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0133] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0134] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for early warning of scaling of a slurry heat exchanger, characterized in that: The early warning method comprises: Obtain the operating parameters of the slurry heat exchanger; Based on the operating parameters of the slurry heat exchanger, determine the actual total heat transfer coefficient and actual heat transfer efficiency; Determine the fouling warning index based on the actual total heat transfer coefficient and actual heat exchange efficiency; Based on the comparison result between the fouling warning index and the fouling warning threshold, fouling warning information is generated.

2. The oil-slurry heat exchanger scaling early warning method according to claim 1, characterized in that: The scaling early warning index includes a first scaling early warning index and a second scaling early warning index; The scaling warning index is determined based on the actual total heat transfer coefficient and the actual heat exchange efficiency, including: The ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient is determined as the first fouling warning indicator; The ratio of the actual heat exchange efficiency to the standard heat exchange efficiency is determined as the second fouling warning indicator.

3. The oil-slurry heat exchanger scaling early warning method according to claim 2, characterized in that: The scaling warning information is generated based on the comparison result between the scaling warning index and the scaling warning threshold, including: When it is determined that the first scaling warning indicator and the second scaling warning indicator are both greater than the second scaling warning threshold, generating a normal operation prompt message; When it is determined that the first scaling warning indicator and the second scaling warning indicator are both between the first scaling warning threshold and the second scaling warning threshold, generating scaling risk warning information; When it is determined that the first fouling warning indicator and the second fouling warning indicator are both less than the first fouling warning threshold, a severe fouling warning message is generated; The scaling warning threshold includes a first scaling warning threshold and a second scaling warning threshold, and the first scaling warning threshold is less than the second scaling warning threshold; the scaling warning information includes normal operation prompt information, scaling risk prompt information and severe scaling warning information.

4. A scaling early warning device for an oil-slurry heat exchanger, characterized in that: The early warning device includes a data acquisition unit, a data processing unit, an early warning indicator determination unit and an early warning information generation unit; The data acquisition unit is used to acquire the operating parameters of the oil-slurry heat exchanger; The data processing unit is used to determine the actual total heat transfer coefficient and the actual heat transfer efficiency based on the operating parameters of the oil-slurry heat exchanger; The early warning index determination unit is used to determine the fouling early warning index based on the actual total heat transfer coefficient and the actual heat exchange efficiency; The warning information generating unit is used to generate scaling warning information based on a comparison result between the scaling warning indicator and the scaling warning threshold.

5. The oil-slurry heat exchanger scaling early warning device according to claim 4 is characterized in that: The early warning indicator determination unit includes a first early warning indicator determination module and a second early warning indicator determination module; The first early warning indicator determination module is used to determine the ratio of the actual total heat transfer coefficient to the standard total heat transfer coefficient as the first scaling early warning indicator; The second early warning indicator determination module is used to determine the ratio of the actual heat exchange efficiency to the standard heat exchange efficiency as the second fouling early warning indicator.

6. The oil-slurry heat exchanger scaling early warning device according to claim 5, characterized in that: The warning information generation unit includes a first warning information generation module, a second warning information generation module and a third warning information generation module; The first warning information generating module is used to generate normal operation prompt information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both greater than the second scaling warning threshold; The second warning information generating module is used to generate scaling risk warning information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both between the first scaling warning threshold and the second scaling warning threshold; The third warning information generating module is used to generate severe scaling warning information when it is determined that the first scaling warning indicator and the second scaling warning indicator are both less than the first scaling warning threshold; The scaling warning threshold includes a first scaling warning threshold and a second scaling warning threshold, and the first scaling warning threshold is less than the second scaling warning threshold; the scaling warning information includes normal operation prompt information, scaling risk prompt information and severe scaling warning information.

7. A scaling warning device for a slurry heat exchanger, characterized in that: The early warning device includes a processor and a memory, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by one or more of the above processors, so that the early warning device implements the oil-slurry heat exchanger fouling early warning method according to any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the program code is loaded and executed by a processor so that a computer implements the oil-slurry heat exchanger fouling early warning method according to any one of claims 1 to 3.

9. An online descaling system for oil-slurry heat exchanger, characterized in that: The descaling system comprises a cleaning device, a control device and the early warning device according to claim 7; The early warning device is used to send scaling early warning information to the control device; The control device is used to determine the scaling risk level based on the scaling warning information and generate a control instruction corresponding to the scaling risk level; The cleaning device is used to respond to a control instruction and pass a predetermined amount of oil slurry purifier into the oil slurry heat exchanger.

10. The online descaling system for slurry heat exchanger according to claim 9, characterized in that: The control instructions include oil slurry purification temperature control instructions, oil slurry purification time control instructions and oil slurry purification concentration control instructions.

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