Method and device for determining heat transfer coefficient of heat exchanger, equipment and medium

Abstract

The invention relates to the technical field of heat exchanger heat transfer capability evaluation, in particular to a heat exchanger heat transfer coefficient determination method and device, equipment and a medium. The method comprises the steps that the inlet temperature and the outlet temperature of a heating side medium of the heat exchanger, the flow, the inlet temperature and the outlet temperature of a heated side medium and a heat exchange amount calculation formula are obtained; according to the heat exchange amount calculation formula, a heat transfer coefficient calculation formula is determined; according to the flow of the heated side medium, the inlet temperature and the outlet temperature, the heat exchange amount of the heat exchanger is determined; and according to the heat exchange amount, the inlet temperature and the outlet temperature of a medium on the heating side of the heat exchanger and the inlet temperature and the outlet temperature of a medium on the heated side of the heat exchanger, the heat transfer coefficient of the heat exchanger is determined through the heat transfer coefficient calculation formula. The scaling degree of the heat exchanger in operation can be judged in time, the heat exchanger is flushed in time, the heat transfer capacity of the heat exchanger is recovered, meanwhile, scale removal in advance is prevented, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat transfer capacity evaluation of heat exchangers, and in particular to a heat transfer coefficient determination method and device, equipment and medium for heat exchangers. BACKGROUND

[0002] Waste heat utilization is relatively widespread in oilfield production, including oilfield process heat, water mixing heat for oil transfer stations, and dehydration heat for joint stations. Plate heat exchangers are suitable for pure fluids and are suitable for, for example, sewage heat exchange and crude oil heat exchange. Wide channel heat exchangers have a channel width of 30 mm and have certain advantages for complex and dirty media in the water mixing system. Currently, the problems encountered after the heat exchanger is put into operation are that the outlet temperature of the wide channel heat exchanger drops too quickly after being put into operation, and the temperature cannot meet the production requirements, and it is urgent to understand the heat transfer coefficient of the wide channel heat exchanger. Currently, only the theoretical heat transfer coefficient of the heat exchanger just out of the factory can be given, and the accurate heat transfer coefficient value of the heat exchanger in operation cannot be calculated. The temperature of the plate heat exchanger drops too quickly after being flushed and put into operation, and through preliminary analysis, it is due to the fouling of the heat exchanger.

[0003] Through timely scale removal, the heat exchange efficiency of the heat exchanger can be improved, but if the plate heat exchanger and the wide channel heat exchanger are cleaned in advance, the scale removal cost will be wasted; if the heat exchanger is delayed for scale removal, heat will be wasted, and therefore, the heat transfer coefficient of the heat exchanger needs to be grasped in a timely manner to determine the optimal scale removal time. The existing heat transfer coefficient calculation formula of the heat exchanger is as follows:

[0004]

[0005] In the formula, α1 is the heat transfer coefficient of the heat source medium; α2 is the heat transfer coefficient of the heated medium; δ1 is the thickness of the heat exchange wall plate; δ2 is the thickness of the scale; γ1 is the heat transfer coefficient of the heat exchange wall plate; and γ2 is the heat transfer coefficient of the scale.

[0006] The existing heat transfer coefficient calculation formula has many values when calculating. After the heat exchanger is put into operation, scale will be generated on the heat exchange surface, but since the heat exchanger has already been put into operation, it cannot be directly opened for measurement, and it is necessary to wait until the heat exchanger is opened for cleaning to measure the scale formation degree of the heat exchange surface, take a sample for scale component analysis, and then calculate the heat transfer coefficient. Therefore, the heat transfer coefficient of the scale cannot be obtained in a timely manner. The heat transfer coefficients of the heat source medium and the heated medium are related to factors such as flow state, and the heat transfer coefficients of the heat source medium and the heated medium are also difficult to calculate. Therefore, the K value of the heat exchanger after being put into operation cannot be accurately calculated, the scale formation degree of the heat exchange surface cannot be judged, the heat transfer coefficient of the heat exchanger cannot be given in a timely and accurate manner, and the production requirements cannot be met. SUMMARY

[0007] The present application provides a heat exchanger heat transfer coefficient determination method and device, equipment and medium, to solve the problem that the fouling thickness and heat transfer coefficient of the existing heat exchanger are difficult to measure and calculate, which leads to the inability to accurately determine the current heat transfer coefficient of the heat exchanger, the inability to judge the fouling degree of the heat exchanger, and the inability to accurately determine the best cleaning time of the heat exchanger.

[0008] According to an aspect of the present application, a heat exchanger heat transfer coefficient determination method is provided, comprising:

[0009] obtaining the inlet temperature and outlet temperature of the heat exchanger heating side medium, and the flow rate, inlet temperature and outlet temperature of the heated side medium, and a heat exchange calculation formula;

[0010] determining a heat transfer coefficient calculation formula according to the heat exchange calculation formula;

[0011] determining the heat exchange of the heat exchanger according to the flow rate, inlet temperature and outlet temperature of the heated side medium;

[0012] determining the heat transfer coefficient of the heat exchanger by using the heat transfer coefficient calculation formula according to the heat exchange, the inlet temperature and outlet temperature of the heat exchanger heating side medium, and the inlet temperature and outlet temperature of the heated side medium.

[0013] Preferably, the method for obtaining the inlet temperature and outlet temperature of the heat exchanger heating side medium, and the inlet temperature and outlet temperature of the heated side medium, comprises:

[0014] a first temperature meter is arranged on the inlet pipeline and outlet pipeline of the heat exchanger heating side respectively, and the first temperature meter is used to detect the inlet temperature and outlet temperature of the heat exchanger heating side medium;

[0015] a second temperature meter is arranged on the inlet pipeline and outlet pipeline of the heat exchanger heated side respectively, and the second temperature meter is used to detect the inlet temperature and outlet temperature of the heat exchanger heated side medium.

[0016] Preferably, the heat exchange calculation formula comprises:

[0017] Q=kF△t (1);

[0018] wherein Q is the heat exchange, W; F is the heat exchange area of the heat exchanger, m 2 ;△t is the temperature difference between the two ends of the heat exchanger, ℃; k is the heat transfer coefficient, W / (m 2 ·℃).

[0019] Preferably, the method for determining the heat transfer coefficient calculation formula according to the heat exchange calculation formula comprises:

[0020] The heat transfer coefficient in the heat exchange amount calculation formula is moved from the right side of the equal sign to the left side of the equal sign by equation transposition rules, and the heat exchange amount is moved from the left side of the equal sign to the right side of the equal sign, to obtain the heat transfer coefficient calculation formula.

[0021] Preferably, the method for determining the heat exchange amount of the heat exchanger according to the flow rate, inlet temperature and outlet temperature of the heated side medium comprises:

[0022] The heat exchange amount of the heat exchanger is determined by using formula (2);

[0023] Q=A*1.16*(T2-T1)*1000 (2);

[0024] In the formula, Q is the heat exchange amount; A is the flow rate of the heated side medium; T2 is the outlet temperature of the heated side medium, ℃; T1 is the inlet temperature of the heated side medium, ℃.

[0025] Preferably, the method for determining the heat transfer coefficient of the heat exchanger according to the heat exchange amount, the inlet temperature and outlet temperature of the heated side medium of the heat exchanger, and the inlet temperature and outlet temperature of the heated side medium, by using the heat transfer coefficient calculation formula, comprises:

[0026] The heat exchange area of the heat exchanger is obtained;

[0027] The temperature difference between the two ends of the heat exchanger is determined according to the inlet temperature and outlet temperature of the heated side medium of the heat exchanger, and the inlet temperature and outlet temperature of the heated side medium;

[0028] The heat transfer coefficient of the heat exchanger is determined by using the heat transfer coefficient calculation formula according to the heat exchange amount, the heat exchange area and the temperature difference between the two ends of the heat exchanger.

[0029] Preferably, the method for determining the temperature difference between the two ends of the heat exchanger according to the inlet temperature and outlet temperature of the heated side medium of the heat exchanger, and the inlet temperature and outlet temperature of the heated side medium comprises:

[0030] The temperature difference between the two ends of the heat exchanger is determined by using formula (3);

[0031] △t=[(T1-t2)-(T2-t1)] / ln[(T1-t2)÷(T2-t1)] (3);

[0032] In the formula, △t is the temperature difference between the two ends of the heat exchanger, T1 and T2 are the inlet temperature and outlet temperature of the heated side medium of the heat exchanger respectively; t1 and t2 are the inlet temperature and outlet temperature of the heated side medium of the heat exchanger respectively.

[0033] Preferably, the heat transfer coefficient calculation formula comprises:

[0034]

[0035] K = Q / (F * △t) 2 W; F is heat exchange area, m 2 ;△t is temperature difference of heat exchanger, ℃.

[0036] Preferably, the decrease amplitude of the heat transfer coefficient of the heat exchanger compared with the initial operation stage is determined;

[0037] If the decrease amplitude is less than the limit value of the heat transfer coefficient decrease amplitude, the heat exchanger continues to operate;

[0038] If the decrease amplitude is greater than or equal to the limit value of the heat transfer coefficient decrease amplitude, the heat exchanger is cleaned.

[0039] According to an aspect of the present application, a heat exchanger heat transfer coefficient determination device is provided, comprising:

[0040] An acquisition unit is configured to acquire the inlet temperature and outlet temperature of the heating side medium of the heat exchanger, the flow, inlet temperature and outlet temperature of the heated side medium, and a heat exchange amount calculation formula;

[0041] A formula determination unit is configured to determine a heat transfer coefficient calculation formula according to the heat exchange amount calculation formula;

[0042] A heat exchange amount determination unit is configured to determine the heat exchange amount of the heat exchanger according to the flow, inlet temperature and outlet temperature of the heated side medium;

[0043] A heat transfer coefficient determination unit is configured to determine the heat transfer coefficient of the heat exchanger by using the heat transfer coefficient calculation formula according to the heat exchange amount, the inlet temperature and outlet temperature of the heating side medium of the heat exchanger, and the inlet temperature and outlet temperature of the heated side medium.

[0044] According to an aspect of the present application, an electronic device is provided, comprising:

[0045] A processor;

[0046] A memory for storing processor executable instructions;

[0047] The processor is configured to execute the heat exchanger heat transfer coefficient determination method.

[0048] According to an aspect of the present application, a computer readable storage medium is provided, which stores computer program instructions, and the computer program instructions are executed by a processor to implement the heat exchanger heat transfer coefficient determination method.

[0049] The present application has at least the following beneficial effects:

[0050] The present application provides a heat transfer coefficient determination method and device, equipment and medium for a heat exchanger, a heat transfer coefficient calculation formula is derived through a heat exchange amount calculation formula, the heat transfer coefficient is determined by obtaining the inlet and outlet temperatures of the heat exchanger, the accurate heat transfer coefficient is finally determined, and the fouling degree of the running heat exchanger can be judged, the heat exchanger is timely flushed, the heat transfer capacity of the heat exchanger is restored, and the fouling is prevented in advance, thereby reducing the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0051] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the present application and, together with the specification, serve to explain the technical solutions of the present application.

[0052] Figure 1 A flow chart of a heat transfer coefficient determination method for a heat exchanger according to an embodiment of the present application is shown;

[0053] Figure 2 A block diagram of an electronic device 800 according to an embodiment of the present application is shown;

[0054] Figure 3 A block diagram of an electronic device 1900 according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0055] Various exemplary embodiments, features and aspects of the present application will be explained in detail below with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0056] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0057] The term "and / or" in this document is merely used to describe associated objects, and can represent three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the term "at least one" in this document represents any one of a plurality of or any combination of at least two of a plurality of, for example, at least one of A, B and C includes any one or more elements selected from the set consisting of A, B and C.

[0058] In addition, for a better understanding of the present application, a number of specific details are given in the following detailed description. It will be readily apparent to those skilled in the art that the present application can be practiced without some of the specific details, in some instances, well-known methods, devices, elements, and circuits have not been described in detail in order to avoid obscuring the present application.

[0059] Figure 1 A flow chart of a heat transfer coefficient determination method of a heat exchanger according to an embodiment of the present application is shown; Figure 2 A block diagram of an electronic device 800 according to an embodiment of the present application is shown; Figure 3 A block diagram of an electronic device 1900 according to an embodiment of the present application is shown. As shown, Figures 1-3 A heat transfer coefficient determination method of a heat exchanger includes: step S01: obtaining inlet temperature and outlet temperature of a heating side medium of a heat exchanger, and flow, inlet temperature and outlet temperature of a heated side medium, and a heat exchange amount calculation formula; step S02: determining a heat transfer coefficient calculation formula according to the heat exchange amount calculation formula; step S03: determining a heat exchange amount of the heat exchanger according to the flow, inlet temperature and outlet temperature of the heated side medium; and step S04: determining a heat transfer coefficient of the heat exchanger by using the heat transfer coefficient calculation formula according to the heat exchange amount, the inlet temperature and outlet temperature of the heating side medium of the heat exchanger, and the inlet temperature and outlet temperature of the heated side medium.

[0060] The heat transfer coefficient determination method of the heat exchanger provided by the embodiment of the present application specifically includes the following steps:

[0061] Step S01: obtaining inlet temperature and outlet temperature of a heating side medium of a heat exchanger, and flow, inlet temperature and outlet temperature of a heated side medium, and a heat exchange amount calculation formula.

[0062] In the present application, the method for obtaining inlet temperature and outlet temperature of a heating side medium of a heat exchanger, and inlet temperature and outlet temperature of a heated side medium includes: a first temperature meter is arranged on an inlet pipeline and an outlet pipeline of the heating side of the heat exchanger, and the first temperature meter is used to detect inlet temperature and outlet temperature of the heating side medium of the heat exchanger; a second temperature meter is arranged on an inlet pipeline and an outlet pipeline of the heated side of the heat exchanger, and the second temperature meter is used to detect inlet temperature and outlet temperature of the heated side medium of the heat exchanger.

[0063] In the embodiment of the present application, a first temperature meter is installed on the inlet pipeline and the outlet pipeline of the heating side of the heat exchanger respectively, and the temperature of the heating side medium is detected by the first temperature meter; meanwhile, a second temperature meter is installed on the inlet pipeline and the outlet pipeline of the heated side of the heat exchanger respectively, and the temperature of the heated side medium is detected by the second temperature meter. The heat exchanger includes a plate heat exchanger and a wide channel heat exchanger, the heating side medium of the heat exchanger is sewage, and the heated side is softened water.

[0064] The flow of the heat exchanger can be detected by setting a flow meter in the heated side pipeline, or the displacement (flow) of the heated medium can be determined by the current value of the heat exchanger water pump.

[0065] Taking a certain plate heat exchanger as an example, the heating side (sewage): flow = 447.7 m 3 / h, inlet temperature 35.2 DEG C, outlet temperature 33.4 DEG C; the heated side medium (softened water): flow = 398.3 m 3 / h, inlet temperature 32.4 DEG C, outlet temperature 34.4 DEG C.

[0066] Taking a certain wide channel heat exchanger as an example, the heating side (sewage): flow = 58.66 m 3 / h, inlet temperature 35.9 DEG C, outlet temperature 51.3 DEG C; the heated side medium (softened water): flow = m 3 / h, inlet temperature 60.8 DEG C, outlet temperature 49.1 DEG C.

[0067] Step S02: determining a heat transfer coefficient calculation formula according to the heat exchange calculation formula.

[0068] In the present application, the heat exchange calculation formula comprises:

[0069] Q = kF△t (1);

[0070] In the formula, Q is the heat exchange amount, W; F is the heat exchange area of the heat exchanger, m 2 ;△t is the temperature difference between the two ends of the heat exchanger, DEG C; k is the heat transfer coefficient, W / (m 2 · DEG C).

[0071] In the present application, the method for determining the heat transfer coefficient calculation formula according to the heat exchange calculation formula comprises: moving the heat transfer coefficient in the heat exchange calculation formula from the right side of the equal sign to the left side of the equal sign, and moving the heat exchange amount from the left side of the equal sign to the right side of the equal sign at the same time, to obtain the heat transfer coefficient calculation formula.

[0072] In the embodiment of the present application, in formula (1), Q is the heat flow through the heat transfer surface per unit time; F is the heat transfer calculation area; △t is the temperature difference between the hot fluid and the cold fluid, commonly known as the heat transfer temperature difference; k is the heat transfer coefficient, which is equal in value to the heat transferred per unit heat transfer area per unit time when the heat transfer temperature difference is 1℃; F is the heat transfer calculation area, which can be obtained by checking the heat exchanger model.

[0073] The existing heat exchange amount calculation formula is obtained by multiplying the heat transfer coefficient k, the heat transfer calculation area F and the temperature difference △t of the heat exchanger at both ends, therefore, by transforming formula (1), the heat transfer coefficient k calculation formula based on the heat exchange amount Q, the heat transfer calculation area F and the temperature difference △t of the heat exchanger at both ends can be obtained.

[0074] By setting temperature and flow detection instruments on site, the heat exchanger field data can be collected to calculate the total heat transfer coefficient K of the heat exchanger. In the case of relatively stable flow, it is used to evaluate the degree of fouling of the heat exchanger and guide the operation management and cleaning work of the heat exchanger on site.

[0075] Step S03: determining the heat exchange amount of the heat exchanger according to the flow, inlet temperature and outlet temperature of the heated side medium.

[0076] In the present application, the method for determining the heat exchange amount of the heat exchanger according to the flow, inlet temperature and outlet temperature of the heated side medium comprises: determining the heat exchange amount of the heat exchanger by using formula (2).

[0077] Q=A*1.16*(T2-T1)*1000 (2);

[0078] In the formula, Q is the heat exchange amount; A is the flow of the heated side medium; T2 is the outlet temperature of the heated side medium, ℃; T1 is the inlet temperature of the heated side medium, ℃.

[0079] In the embodiment of the present application, in order to determine the heat transfer coefficient according to the heat transfer coefficient calculation formula, it is necessary to first determine the value Q of the heat exchange amount in the formula. However, the heat exchange amount Q cannot be calculated by formula (1) because there is an unknown parameter k in formula (1) at this time, therefore, the heat exchange amount Q needs to be calculated according to the flow, outlet temperature and inlet temperature of the heated side medium of the heat exchanger, that is, formula (2).

[0080] The flow of the heated side medium in formula (2) is obtained by detecting the flow meter; the outlet temperature and the inlet temperature of the heated side medium are obtained by detecting the second thermometer.

[0081] Taking a certain plate heat exchanger as an example, the flow of the heated side medium (softened water) is 398.3m 3 / h, the inlet temperature 32.4℃, the outlet temperature 34.4℃. Then the heat exchange Q=398.3*1.16*(34.4-32.4)*1000=929367W.

[0082] Taking a certain wide flow channel heat exchanger as an example, the heated side medium (softened water): flow rate=58.66m 3 / h, the inlet temperature 60.8℃, the outlet temperature 49.1℃. Then the heat exchange Q=58.66*1.16*(51.3-35.9)*1000=1053924.7W.

[0083] Step S04: according to the heat exchange, the inlet temperature and the outlet temperature of the heat exchanger heating side medium, and the inlet temperature and the outlet temperature of the heated side medium, the heat transfer coefficient calculation formula is used to determine the heat transfer coefficient of the heat exchanger.

[0084] In the application, the method for determining the heat transfer coefficient of the heat exchanger according to the heat exchange, the inlet temperature and the outlet temperature of the heat exchanger heating side medium, and the inlet temperature and the outlet temperature of the heated side medium, and the heat transfer coefficient calculation formula, comprises: obtaining the heat exchange area of the heat exchanger; determining the temperature difference between the two ends of the heat exchanger according to the inlet temperature and the outlet temperature of the heat exchanger heating side medium, and the inlet temperature and the outlet temperature of the heated side medium; and determining the heat transfer coefficient of the heat exchanger according to the heat exchange, the heat exchange area and the temperature difference between the two ends of the heat exchanger, and the heat transfer coefficient calculation formula.

[0085] In the application, the method for determining the temperature difference between the two ends of the heat exchanger according to the inlet temperature and the outlet temperature of the heat exchanger heating side medium, and the inlet temperature and the outlet temperature of the heated side medium, comprises: determining the temperature difference between the two ends of the heat exchanger by formula (3).

[0086] △t= [(T1-t2)-(T2-t1)] / ln[(T1-t2)÷(T2-t1)] (3);

[0087] In the formula, △t is the temperature difference between the two ends of the heat exchanger, T1 and T2 are the inlet temperature and the outlet temperature of the heated side medium of the heat exchanger respectively, and t1 and t2 are the inlet temperature and the outlet temperature of the heat exchanger heating side medium respectively.

[0088] In the embodiment of the application, taking a certain plate heat exchanger as an example; the hot side inlet temperature is 35.2℃, the outlet temperature is 33.4℃; the heated side inlet temperature is 32.4℃, the outlet temperature is 34.4℃.

[0089] Therefore, the temperature difference between the two ends of the plate heat exchanger is:

[0090] Δt = [(32.4-33.4)-(34.4-35.2)] / ln[(32.4-33.4)÷(34.4-35.2)] = 0.8963.

[0091] For example, the wide channel heat exchanger has a heating side inlet temperature of 35.9℃ and an outlet temperature of 51.3℃; the heated side has an inlet temperature of 60.8℃ and an outlet temperature of 49.1℃.

[0092] Therefore, the temperature difference between the two ends of the wide channel heat exchanger is:

[0093] Δt = [(60.8-51.3)-(49.1-35.9)] / ln[(60.8-51.3)÷(49.1-35.9)] = 11.25.

[0094] In the present application, the heat transfer coefficient calculation formula comprises:

[0095]

[0096] In the formula, K is the heat transfer coefficient, W / (m 2 ·℃); Q is the heat exchange amount, W; F is the heat exchange area, m 2 ; and Δt is the temperature difference between the two ends of the heat exchanger, ℃.

[0097] In an embodiment of the present application, for example, a plate heat exchanger has a heat exchange area of 1002.96m 2 , and the temperature difference between the two ends of the heat exchanger is 0.8963, and the heat exchange amount Q is 929367W, and the heat transfer coefficient K of the heat exchanger is calculated by using formula (4) as follows:

[0098] K = 929367 / (1002.96 x 0.8963) = 1033.85 W / (m 2 ·℃).

[0099] For example, a wide channel heat exchanger has a heat exchange area of 250m 2 , and the temperature difference between the two ends of the heat exchanger is 11.25, and the heat exchange amount Q is 1053924.7W, and the heat transfer coefficient K of the heat exchanger is calculated by using formula (4) as follows:

[0100] K = 1053924.7 / (250 x 11.25) = 374.77 W / (m 2 ·℃).

[0101] In the present application, the reduction amplitude of the heat transfer coefficient of the heat exchanger compared to the initial operation stage is determined; if the reduction amplitude is less than the limit value of the heat transfer coefficient reduction amplitude, the heat exchanger continues to operate; if the reduction amplitude is greater than or equal to the limit value of the heat transfer coefficient reduction amplitude, the heat exchanger is cleaned.

[0102] In the embodiment of the present application, according to the energy efficiency value level of the heat exchanger, the limit value of the heat transfer coefficient reduction range is determined.

[0103] The energy efficiency value level of the heat exchanger is determined, and the energy efficiency value level division standard is shown in Table 1.

[0104] Table 1: Heat exchanger energy efficiency value level division table

[0105] Level 1 2 3 4 Energy efficiency value 227 200 176 168 Energy efficiency level Energy saving Energy saving Energy saving Non-energy saving Thermal energy reduction (%) 25.99

[0106] The plate heat exchanger energy efficiency value is lower than 176, which may be that the plate heat exchanger is scaled and clogged with oil dirt. The heat exchanger energy efficiency is low, and the heat exchanger is in a non-energy-saving operation state. When the heat exchanger energy efficiency value is reduced to 168, the thermal energy is reduced by 25.99%, which belongs to a non-energy-saving state. When the plate heat exchanger heat exchange capacity is reduced by 25.99%, measures should be taken to improve the heat exchange capacity.

[0107] According to the heat exchanger related standard, when the heat transfer and resistance deviate from the design value too much or cannot meet the process system requirements, an effective descaling method should be selected according to the medium characteristics and the scaling of the heat exchanger to clean and restore the process performance of the heat exchanger.

[0108] According to the energy efficiency value level division standard, the energy efficiency level is determined from the last energy-saving level to the non-energy-saving level, and the corresponding energy efficiency value reduction range is determined. The energy efficiency value reduction range is the limit value of the heat transfer coefficient reduction range, that is, 25.99%.

[0109] The heat transfer coefficient of the running heat exchanger is calculated through the heat transfer coefficient formula. The smaller the heat transfer coefficient, the more serious the clogging degree of the heat exchange surface, and the worse the heat transfer effect. The heat transfer coefficient reduction range of the heat exchanger compared with the initial operation stage is determined. If the heat transfer coefficient reduction range is less than the limit value, that is, < 25.99%, the heat exchanger continues to run. If the heat transfer coefficient reduction range is greater than or equal to the limit value, that is, ≥ 25.99%, the heat exchanger is cleaned, so as to realize the accurate cleaning node of the heat exchanger and restore the heat exchange capacity of the heat exchanger.

[0110] After the application of the present application in an oilfield, the heat transfer coefficient of the heat exchanger is evaluated by quickly calculating the K value, the scaling degree of the running heat exchanger is judged, when the heat exchange capacity of the heat exchanger is reduced by 25.99%, the heat exchanger is timely flushed to restore the heat exchange capacity of the heat exchanger. At present, the wide channel heat exchanger has been flushed 4 times, and the plate heat exchanger has been flushed 8 times, the heat exchange capacity is maintained, and the oilfield production is ensured.

[0111] It can be understood that the above-mentioned various method embodiments of the present application can be combined with each other to form combined embodiments without deviating from the principle logic. Due to the limited space, the present application will not be described again.

[0112] The execution subject of the heat exchanger heat transfer coefficient determination method can be a heat exchanger heat transfer coefficient determination device, for example, the heat exchanger heat transfer coefficient determination method can be executed by a terminal device or a server or other processing device, wherein the terminal device can be a user equipment (User Equipment, UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital processing (Personal Digital Assistant, PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. In some possible implementation manners, the heat exchanger heat transfer coefficient determination method can be realized by a processor calling computer readable instructions stored in a memory.

[0113] Those skilled in the art can understand that, in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process, and the specific execution order of each step should be determined according to its function and possible internal logic.

[0114] In the present application, a heat exchanger heat transfer coefficient determination device is also provided, comprising: an acquisition unit configured to acquire inlet temperature and outlet temperature of a heating side medium of a heat exchanger, and flow, inlet temperature and outlet temperature of a heated side medium, and a heat exchange amount calculation formula; a formula determination unit configured to determine a heat transfer coefficient calculation formula according to the heat exchange amount calculation formula; a heat exchange amount determination unit configured to determine a heat exchange amount of the heat exchanger according to the flow, inlet temperature and outlet temperature of the heated side medium; and a heat transfer coefficient determination unit configured to determine a heat transfer coefficient of the heat exchanger by using the heat transfer coefficient calculation formula according to the heat exchange amount, the inlet temperature and outlet temperature of the heating side medium of the heat exchanger, and the inlet temperature and outlet temperature of the heated side medium.

[0115] In some embodiments, the device provided by the embodiments of the present application has functions or includes modules and units, which can be used to execute the methods described in the above method embodiment, and the specific implementation can refer to the description of the above method embodiment. For brevity, it will not be described here.

[0116] The present application finds out the calculation method of the heat transfer coefficient from another angle by collecting the inlet temperature and outlet temperature of both sides of the heat exchanger, the flow parameter of the heated medium, obtaining the heat exchange amount calculation formula according to the heat transfer amount calculation formula of the heat exchanger and the heated medium, and adopting an indirect method to obtain the heat transfer coefficient value. Only the flow parameter of the temperature meter needs to be collected on site, and then the heat transfer coefficient of the running heat exchanger can be quickly calculated, the fouling degree of the heat exchanger is evaluated, the on-site operation management and cleaning work of the heat exchanger are guided, the heat transfer capacity of the heat exchanger is restored, and the process production heat is ensured.

[0117] The method is fast and simple in operation, has wide application prospect in the waste heat utilization system, and when the heat transfer coefficient of the waste heat engineering heat exchanger is calculated, the application will greatly improve the heat exchanger technical management level, according to the heat transfer coefficient change trend, the heat exchanger is timely flushed, and the problems that the heat transfer coefficient of the current operating heat exchanger is difficult to calculate and cannot be calculated are solved.

[0118] The embodiment of the present application also provides a computer readable storage medium, which stores computer program instructions, and the computer program instructions are executed by a processor to realize the heat transfer coefficient determination method of the heat exchanger.

[0119] The embodiment of the present application also provides an electronic device, which comprises a processor, a memory for storing processor executable instructions, wherein the processor is configured to execute the heat transfer coefficient determination method of the heat exchanger.

[0120] Figure 2 is a block diagram of an electronic device 800 according to an exemplary embodiment. For example, the electronic device 800 can be a terminal such as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0121] Referring to Figure 2 , the electronic device 800 can include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0122] The processing component 802 usually controls the overall operation of the electronic device 800, such as operations associated with displaying, making phone calls, data communications, camera operations and recording operations. The processing component 802 can include one or more processors 820 to execute instructions to complete all or part of the steps of the above method. In addition, the processing component 802 can include one or more modules to facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

[0123] The memory 804 is configured to store various types of data to support the operation of the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, contact data, phonebook data, messages, pictures, videos, etc. The memory 804 can be implemented by any type of volatile or nonvolatile memory, 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 disc, or optical disc.

[0124] The power supply component 806 supplies power for various components of the electronic device 800. The power supply component 806 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800.

[0125] The multimedia component 808 includes a screen providing an output interface between the electronic device 800 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 808 includes a front camera and / or a back camera. The front camera and / or the back camera can receive external multimedia data when the electronic device 800 is in an operation mode, such as a photographing mode or a video mode. Each of the front camera and the back camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0126] The audio component 810 is configured to output and / or input an audio signal. For example, the audio component 810 includes a microphone (MIC) configured to receive an external audio signal when the electronic device 800 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 also includes a speaker for outputting an audio signal.

[0127] The I / O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which can be a keypad, a click wheel, buttons, etc. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0128] The sensor component 814 includes one or more sensors for providing status assessments for various aspects of the electronic device 800. For example, the sensor component 814 can detect an open / closed position of the electronic device 800, relative positioning of components, such as a display and a keypad of the electronic device 800, a change in position of the electronic device 800 or a component of the electronic device 800, presence or absence of user contact with the electronic device 800, orientation or acceleration / deceleration / g-force and temperature of the electronic device 800. The sensor component 814 can include an optical sensor for detecting ambient light, a proximity sensor for detecting the presence of nearby objects without any physical touch, a CMOS or CCD image sensor for use in imaging applications, or an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor in some embodiments.

[0129] The communication component 816 is configured to facilitate wired or wireless communication between the electronic device 800 and other devices. The electronic device 800 can access a wireless network based on a corresponding communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an example embodiment, the communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) techniques, infrared data association (IrDA) techniques, ultra-wideband (UWB) techniques, Bluetooth (BT) techniques, and other techniques.

[0130] In an example embodiment, the electronic device 800 can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements, to perform the above-described methods.

[0131] In an example embodiment, a non-transitory computer-readable storage medium, such as the memory 804 including computer program instructions, is also provided, which can be executed by the processor 820 of the electronic device 800 to perform the above-described methods.

[0132] Figure 3 FIG. 19 is a block diagram of an electronic device 1900 according to an example embodiment. For example, the electronic device 1900 can be provided as a server. Referring to FIG. 19, the electronic device 1900 includes a bus 1901, a processor 1902, a memory 1903, a storage 1904, an input / output (I / O) interface 1905, a display 1906, and a communication interface 1907. Figure 3The electronic device 1900 includes a processing assembly 1922, which is further comprised of one or more processors, and memory resources represented by the memory 1932 for storing instructions, such as an application program, executable by the processing assembly 1922. The application program stored in the memory 1932 can include one or more than one module each corresponding to a set of instructions. Further, the processing assembly 1922 is configured to execute the instructions to perform the above-described methods.

[0133] The electronic device 1900 can further include a power supply assembly 1926 configured to perform power management of the electronic device 1900, a wired or wireless network interface 1950 configured to connect the electronic device 1900 to a network, and an input output (I / O) interface 1958. The electronic device 1900 can operate based on an operating system stored in the memory 1932, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, or the like.

[0134] In an exemplary embodiment, there is also provided a non-transitory computer readable storage medium, such as the memory 1932 including computer program instructions executable by the processing assembly 1922 of the electronic device 1900 to perform the above-described methods.

[0135] The present application can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present application.

[0136] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched tape, a

[0137] Computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0138] Computer readable program instructions for carrying out operations of the present application can be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computing / processing device, partly on the user's computing / processing device, as a stand-alone software package, partly on the user's computing / processing device and partly on a remote computing / processing device or entirely on the remote computing / processing device or server. In the latter scenario, the remote computing / processing device can be connected to the user's computing / processing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computing / processing device, for example, through the Internet using an Internet Service Provider. In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present application.

[0139] The computer readable program instructions can also be loaded onto a computing / processing device, other programmable data processing apparatus, or other device to cause a series of operations to be performed on the computing / processing device, other programmable apparatus or other device to produce a computer implemented process, such that the instructions which execute on the computing / processing device, other programmable apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0140] These computer readable program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. These computer readable program instructions can also be stored in a computer readable storage medium that can include a non-transitory computer readable storage medium that can be a computer- readable storage medium having no data storage cycles that change state. The instructions can be executed by one or more processors of a computer, to cause a series of operational steps to be performed on the computer to produce a computer-implemented process. The instructions can also cause one or more processors of a computer or other programmable data processing apparatus to

[0141] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0142] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0143] Embodiments of the application have been described above, and the description is intended to be illustrative of the embodiments of the application and not exhaustive or limiting. Numerous modifications and adaptations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The scope of the embodiments of the application is defined by the appended claims, rather than the description preceding it, which is provided for illustrative purposes. The selection of the terms to be used in this disclosure is intended to best convey the principles of the embodiments of the application, practical application, or improvement to the art, or to enable other of ordinary skill in the art to understand the embodiments of the application disclosed herein.

Claims

1. A method for determining the heat transfer coefficient of a heat exchanger, characterized in that, include: Obtain the inlet and outlet temperatures of the heating medium on the heat exchanger, as well as the flow rate, inlet and outlet temperatures of the heated medium, and the formula for calculating the heat exchange capacity. Based on the heat exchange calculation formula, the heat transfer coefficient calculation formula is determined; The heat exchange capacity of the heat exchanger is determined based on the flow rate, inlet temperature, and outlet temperature of the medium on the heated side. The heat transfer coefficient of the heat exchanger is determined using the heat transfer coefficient calculation formula based on the heat exchanger's heat exchange capacity, the inlet and outlet temperatures of the heating medium, and the inlet and outlet temperatures of the heated medium.

2. The method for determining the heat transfer coefficient of a heat exchanger according to claim 1, characterized in that, The method for obtaining the inlet and outlet temperatures of the heating side medium and the inlet and outlet temperatures of the heated side medium of the heat exchanger includes: A first thermometer is installed on the inlet pipe and the outlet pipe on the heating side of the heat exchanger. The first thermometer is used to detect the inlet temperature and the outlet temperature of the medium on the heating side of the heat exchanger. A second thermometer is installed on the inlet and outlet pipes of the heat exchanger on the heated side, respectively. The second thermometer is used to detect the inlet temperature and outlet temperature of the medium on the heated side of the heat exchanger.

3. The method for determining the heat transfer coefficient of a heat exchanger according to claim 1, characterized in that, The formula for calculating the heat exchange includes: Q = kFΔt (1); In the formula: Q is the heat exchange capacity, W; F is the heat exchange area of ​​the heat exchanger, m² 2 ; Δt is the temperature difference between the two ends of the heat exchanger, in °C; k is the heat transfer coefficient, in W / (m²). 2 ·℃).

4. The method for determining the heat transfer coefficient of a heat exchanger according to claim 3, characterized in that, The method for determining the heat transfer coefficient calculation formula based on the heat exchange calculation formula includes: By using the equation substitution rule, the heat transfer coefficient in the heat transfer calculation formula is shifted from the right side of the equal sign to the left side of the equal sign, and the heat transfer is shifted from the left side of the equal sign to the right side of the equal sign, thus obtaining the heat transfer coefficient calculation formula.

5. The method for determining the heat transfer coefficient of a heat exchanger according to claim 1, characterized in that, The method for determining the heat exchanger's heat transfer capacity based on the flow rate, inlet temperature, and outlet temperature of the heated medium includes: The heat exchange capacity of the heat exchanger is determined using equation (2); Q=A*1.16*(T2-T1)*1000 (2); In the formula: Q is the heat exchange; A is the flow rate of the medium on the heated side; T2 is the outlet temperature of the medium on the heated side, °C; T1 is the inlet temperature of the medium on the heated side, °C.

6. The method for determining the heat transfer coefficient of a heat exchanger according to claim 1, characterized in that, The method for determining the heat transfer coefficient of the heat exchanger based on the heat exchange capacity, the inlet and outlet temperatures of the heating-side medium, and the inlet and outlet temperatures of the heated-side medium, using the heat transfer coefficient calculation formula, includes: Obtain the heat exchange area of ​​the heat exchanger; The temperature difference between the two ends of the heat exchanger is determined based on the inlet and outlet temperatures of the medium on the heating side and the inlet and outlet temperatures of the medium on the heated side. Based on the heat exchange capacity, heat exchange area, and temperature difference between the two ends of the heat exchanger, the heat transfer coefficient of the heat exchanger is determined using the heat transfer coefficient calculation formula.

7. The method for determining the heat transfer coefficient of a heat exchanger according to claim 6, characterized in that, The method for determining the temperature difference between the two ends of the heat exchanger based on the inlet and outlet temperatures of the heating side medium and the inlet and outlet temperatures of the heated side medium includes: The temperature difference between the two ends of the heat exchanger is determined using equation (3); △t=[(T1-t2)-(T2-t1)] / ln[(T1-t2)÷(T2-t1)] (3); In the formula: △t is the temperature difference between the two ends of the heat exchanger; T1 and T2 are the inlet and outlet temperatures of the medium on the heated side of the heat exchanger, respectively; t1 and t2 are the inlet and outlet temperatures of the medium on the heated side of the heat exchanger, respectively.

8. The method for determining the heat transfer coefficient of a heat exchanger according to claim 1, characterized in that, The formula for calculating the heat transfer coefficient includes: In the formula: K is the heat transfer coefficient, W / (m²) 2 ·℃); Q is the heat exchange capacity, W; F is the heat exchange area, m² 2 ; △t is the temperature difference between the two ends of the heat exchanger, in °C.

9. The method for determining the heat transfer coefficient of a heat exchanger according to any one of claims 1-8, characterized in that: Determine the extent to which the heat transfer coefficient of the heat exchanger decreases compared to the initial operating phase; If the decrease is less than the limit value of the decrease in heat transfer coefficient, the heat exchanger continues to operate; If the reduction is greater than or equal to the threshold value of the reduction in heat transfer coefficient, the heat exchanger shall be cleaned.

10. A device for determining the heat transfer coefficient of a heat exchanger, characterized in that, include: The acquisition unit is used to acquire the inlet and outlet temperatures of the heating medium on the heat exchanger, the flow rate, inlet and outlet temperatures of the heated medium, and the heat exchange calculation formula. The formula determination unit is used to determine the heat transfer coefficient calculation formula based on the heat exchange calculation formula. The heat exchanger determination unit is used to determine the heat exchanger's heat exchanger based on the flow rate, inlet temperature, and outlet temperature of the heated medium. The heat transfer coefficient determination unit is used to determine the heat transfer coefficient of the heat exchanger based on the heat exchange volume, the inlet and outlet temperatures of the heating side medium of the heat exchanger, and the inlet and outlet temperatures of the heated side medium, using the heat transfer coefficient calculation formula.

11. An electronic device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the method according to any one of claims 1 to 9.

12. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the method described in any one of claims 1 to 9.

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