CN116893074B - Method and device for evaluating heat exchanger operation parameters - Google Patents
Method and device for evaluating heat exchanger operation parameters Download PDFInfo
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Abstract
The application provides an evaluation method and an evaluation device for heat exchanger operation parameters, wherein the evaluation method comprises the following steps: according to the current heat exchange quantity W of the heat exchanger under the current operation condition 0 First hot fluid inlet temperature Te 1 And a first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchanger constant A1, A1=W 0 /(Te 1 ‑te 1 ) The method comprises the steps of carrying out a first treatment on the surface of the According to the current heat exchange quantity W of the heat exchanger under the current operation condition 0 First cold fluid outlet temperature ts 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain a second heat exchanger constant A2, A2=W 0 /(ts 1 ‑Ts 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Estimating a target heat exchange amount W of the heat exchanger under a target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating change parameters. According to the application, the heat exchange capacity of the heat exchanger is evaluated by constructing the relation between the heat exchanger constant and the heat exchanger operation parameter and utilizing the heat exchanger constant, so that the evaluation method of the heat exchanger operation parameter is simplified, and the accuracy of the calculation result is improved.
Description
Technical Field
The application belongs to the technical field of heat exchangers, and particularly relates to a method and a device for evaluating operation parameters of a heat exchanger.
Background
Heat exchangers have a wide range of applications in production and engineering activities, and in the event of a change in their working environment, it is necessary to evaluate whether their heat exchange capacity meets the requirements. Typically, the design unit performs calculation by modeling or other simulation means, but it requires special calculation tools and calculation experience, and there is a large error in the calculation result.
Disclosure of Invention
In view of the above, embodiments of the present application are directed to providing a method and an apparatus for evaluating an operating parameter of a heat exchanger, which are capable of simplifying the method for evaluating the operating parameter of the heat exchanger and improving the accuracy of a calculation result by constructing a relationship between a heat exchanger constant and the operating parameter of the heat exchanger and using the heat exchanger constant to evaluate the heat exchange capability of the heat exchanger.
The first aspect of the present application provides a method of assessing an operating parameter of a heat exchanger, the method comprising: acquiring a current steady-state operation parameter of the heat exchanger under a current operation condition, wherein the current steady-state operation parameter comprises a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 First hot fluid outlet temperature Ts 1 Cold fluid flow Q and hot fluid flow Q; acquiring current heat exchange quantity W of heat exchanger under current operation condition 0 The method comprises the steps of carrying out a first treatment on the surface of the According to the current heat exchange quantity W 0 First hot fluid inlet temperature Te 1 And a first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchanger constant A1, A1=W 0 /(Te 1 -te 1 ) The method comprises the steps of carrying out a first treatment on the surface of the According to the current heat exchange quantity W 0 First cold fluid outlet temperature ts 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain a second heat exchanger constant A2, A2=W 0 /(ts 1 -Ts 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Estimating a target heat exchange amount W of the heat exchanger under a target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating change parameters. The target steady state operating invariant parameters of the heat exchanger at the target operating conditions include a cold fluid flow Q and a hot fluid flow Q.
In the scheme, the relation between the first heat exchanger constant and the second heat exchanger constant and the heat exchanger operation parameters is constructed, and the heat exchange capacity of the heat exchanger such as the target heat exchange amount or the target steady-state operation change parameters is estimated by using the first heat exchanger constant and the second heat exchanger constant, so that modeling and complex software operation are not needed, related data such as the target heat exchange amount and the target steady-state operation change parameters can be obtained by using the method on the premise of ensuring accuracy, modeling theoretical calculation errors are avoided by using actual measurement values, and the accuracy of calculation results is improved.
In one embodiment of the application, the target steady state operating variation parameter comprises a second hot fluid inlet temperature Te 2 Second hot fluid outlet temperature Ts 2 And a second cold fluid outlet temperature ts 2 . The target heat exchange quantity W of the heat exchanger under the target operation condition is estimated according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, comprising: if the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Changing to target heat exchange amount W under target operation condition 1 And controlling a first cold fluid inlet temperature te 1 Unchanged, according to the target heat exchange quantity W 1 A first heat exchanger constant A1 and a first cold fluid inlet temperature te 1 Calculating to obtain a second thermal fluid inlet temperature Te 2 ，Te 2 =W 1 /A1+te 1 The method comprises the steps of carrying out a first treatment on the surface of the According to the target heat exchange quantity W 1 Specific heat capacity c2 of hot fluid and hot fluidFlow rate Q and second hot fluid inlet temperature Te 2 Calculating to obtain the second hot fluid outlet temperature Ts 2 ，Ts 2 =Te 2 -W 1 /(c2×q); according to the target heat exchange quantity W 1 A second heat exchanger constant A2 and a second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 ，ts 2 =W 1 /A2+Ts 2 。
In one embodiment of the present application, the target steady state operating variation parameter comprises a second hot fluid outlet temperature Ts 2 And a second cold fluid outlet temperature ts 2 . The target heat exchange quantity W of the heat exchanger under the target operation condition is estimated according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, comprising: if the heat exchanger is operated under the current operating condition, the first hot fluid inlet temperature Te 1 Changing to the second hot fluid inlet temperature Te under the target operating condition 2 And controlling a first cold fluid inlet temperature te 1 Unchanged according to the second hot fluid inlet temperature Te 2 A first heat exchanger constant A1 and a first cold fluid inlet temperature te 1 Calculating to obtain the target heat exchange quantity W of the heat exchanger under the target operation condition 1 ，W 1 =A1×(Te 2 -te 1 ) The method comprises the steps of carrying out a first treatment on the surface of the According to the second hot fluid inlet temperature Te 2 Target heat exchange amount W 1 The specific heat capacity c2 of the hot fluid and the flow rate Q of the hot fluid are calculated to obtain the outlet temperature Ts of the second hot fluid 2 ，Ts 2 =Te 2 -W 1 /(c2×q). According to the target heat exchange quantity W 1 A second heat exchanger constant A2 and a second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 ，ts 2 =W 1 /A2+Ts 2 。
In one embodiment of the application, the target steady state operating variation parameter comprises a second cold fluid inlet temperature te 2 And a second cold fluid outlet temperature ts 2 . The target heat exchange quantity W of the heat exchanger under the target operation condition is estimated according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And eyes(s)At least one of the steady state operating variation parameters includes: if the heat exchanger is operated under the current operating condition, the first hot fluid inlet temperature Te 1 Changing to the second hot fluid inlet temperature Te under the target operating condition 2 And controlling a second hot fluid outlet temperature Ts of the heat exchanger at the target operating condition 2 Not exceeding the preset value S, according to the second hot fluid inlet temperature Te 2 Second hot fluid outlet temperature Ts 2 The specific heat capacity c2 of the hot fluid and the flow Q of the hot fluid are calculated to obtain the target heat exchange quantity W of the heat exchanger under the target operation working condition 1 Threshold value of W 1 =c2×Q×(Te 2 -Ts 2 ),Ts 2 =s; according to the second hot fluid inlet temperature Te 2 Target heat exchange amount W 1 And a first heat exchanger constant A1, to calculate a second cold fluid inlet temperature te 2 Threshold value, te of 2 =Te 2 -W 1 A1; according to the target heat exchange quantity W 1 A second heat exchanger constant A2 and a second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 Threshold of ts 2 =W 1 /A2+Ts 2 ，Ts 2 =S。
In one embodiment of the present application, the target heat exchange amount W of the heat exchanger under the target operation condition is estimated based on the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, comprising: if the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Changing to target heat exchange amount W under target operation condition 1 And controlling a first cold fluid inlet temperature te 1 And if the temperature of the hot fluid inlet is unchanged, calculating a change curve of the temperature of the hot fluid inlet at different moments in the process of adjusting the current operation condition to the target operation condition according to the first heat exchanger constant A1.
In one embodiment of the application, the current steady state operating parameters further include a cold fluid specific heat capacity c1 and a cold fluid flow q. The current heat exchange quantity W of the heat exchanger under the current operation condition is obtained 0 Comprising: according to the specific heat capacity c1 of the cold fluid, the flow rate q of the cold fluid and the firstCold fluid inlet temperature te 1 And a first cold fluid outlet temperature ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 ，W 0 =c1×q×(ts 1 -te 1 )。
In one embodiment of the present application, the current steady state operating parameters further include a thermal fluid specific heat capacity c2, a thermal fluid flow Q. The current heat exchange quantity W of the heat exchanger under the current operation condition is obtained 0 Comprising: according to the specific heat capacity c2, the flow rate Q, the inlet temperature Te of the first hot fluid 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 ，W 0 =c2×Q×(Te 1 -Ts 1 )。
In a second aspect, the present application provides an evaluation device for heat exchanger operating parameters, the evaluation device 1 comprising an acquisition module, a calculation module and an evaluation module. The acquisition module is used for acquiring the current steady-state operation parameter of the heat exchanger under the current operation condition and acquiring the current heat exchange quantity W of the heat exchanger under the current operation condition 0 The current steady state operating parameters include a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 And a first hot fluid outlet temperature Ts 1 . The calculation module is used for calculating the current heat exchange quantity W 0 First hot fluid inlet temperature Te 1 And a first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchanger constant A1 according to the current heat exchange quantity W 0 First cold fluid outlet temperature ts 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain a second heat exchanger constant A2, A1=W 0 /(Te 1 -te 1 )，A2=W/(ts 1 -Ts 1 ). The evaluation module is used for evaluating the target heat exchange quantity W of the heat exchanger under the target operation working condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating change parameters.
A third aspect of the present application provides a computer-readable storage medium having stored thereon computer-executable instructions. The executable instructions, when executed by the processor, implement a method of assessing heat exchanger operating parameters of the first aspect of the application.
A fourth aspect of the application provides an electronic device comprising a processor and a memory. The processor is configured to perform the method of assessing the operating parameters of the heat exchanger of the first aspect of the present application. The memory is used to store executable instructions of the processor.
Drawings
Fig. 1 is a schematic view of a heat exchanger.
Fig. 2 is a flow chart illustrating a method for evaluating an operation parameter of a heat exchanger according to an embodiment of the application.
Fig. 3 is a flow chart of a method for evaluating an operation parameter of a heat exchanger according to another embodiment of the present application.
Fig. 4 is a flow chart of a method for evaluating an operation parameter of a heat exchanger according to another embodiment of the present application.
Fig. 5 is a flowchart illustrating a method for evaluating an operation parameter of a heat exchanger according to still another embodiment of the present application.
Fig. 6 is a flowchart illustrating a method for evaluating an operation parameter of a heat exchanger according to another embodiment of the application.
FIG. 7 is a graph showing the thermal fluid inlet temperature profile of the spent fuel pool calculated according to the evaluation method of the embodiment of FIG. 6.
Fig. 8 is a schematic structural diagram of an apparatus for evaluating an operation parameter of a heat exchanger according to an embodiment of the present application.
Fig. 9 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Fig. 1 is a schematic view of a heat exchanger. As shown in fig. 1, te is the hot fluid inlet temperature, ts is the hot fluid outlet temperature, te is the cold fluid inlet temperature, and Ts is the cold fluid outlet temperature. In combination with the operating parameters under different working conditions, it was found after careful study that, in the case that the cold fluid flow Q and the hot fluid flow Q of the heat exchanger are substantially unchanged (for example, the variation range is within 5%), the following relationship exists between the operating parameters of the heat exchanger: a1 =w/(Te-Te), a2=w/(Ts-Ts), W is the heat exchange amount under the current operation condition, and A1 and A2 are both constants. Based on the finding of the relation, when the heat to be discharged is increased or the inlet and outlet temperature is changed, the heat exchange capacity can be rapidly evaluated to obtain steady-state related data, and the related parameter change process can be calculated. For example, according to any one or more of A1 and A2, the heat exchange amount may be calculated at different cold and hot fluid temperatures, or the associated inlet and outlet temperatures may be calculated at different heat exchange amounts and coolant temperatures.
Based on the above-mentioned study, the embodiments of the present application provide a method and an apparatus for evaluating an operation parameter of a heat exchanger, and a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 2 is a flow chart illustrating a method for evaluating an operation parameter of a heat exchanger according to an embodiment of the application. The execution subject of the evaluation method may be a processor or a server or the like. As shown in fig. 2. The evaluation method includes the following steps.
S100: and acquiring the current steady-state operation parameter of the heat exchanger under the current operation condition. The current steady state operating parameters include a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 First hot fluid outlet temperature Ts 1 A cold fluid flow Q and a hot fluid flow Q.
For example, the heat exchanger may be a plate heat exchanger and the data for the current steady state operating parameters of the heat exchanger at the current operating conditions may be as shown in Table 1 below.
Table 1 data of current steady state operating parameters of heat exchanger under current operating conditions
S200: acquiring current heat exchange quantity W of heat exchanger under current operation condition 0 。
Current heat exchange quantity W of heat exchanger under current operation condition 0 The heat exchanger can be obtained by calculation according to the fluid flow and the inlet and outlet temperature of the heat exchanger, or can be obtained directly according to the processing result of the processor. The current heat exchange amount W is as follows, in combination with several embodiments 0 Is illustrated in the specific manner of calculation.
For example, in some embodiments, the current steady state operating parameters further include a hot fluid specific heat capacity c2, a hot fluid flow Q. The step S200 includes: according to the specific heat capacity c2, the flow rate Q, the inlet temperature Te of the first hot fluid 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 。W 0 =c2×Q×(Te 1 -Ts 1 ). Thus, the current heat exchange quantity W is calculated by using the heat fluid flow and the heat fluid inlet and outlet temperature of the heat exchanger 0 。
For example, assume that the thermal fluid has a specific heat capacity c2=4.2×10 3 J/(kg× ℃ C.), thermal fluid flow q= 100.42kg/s, W, as can be seen from the data of table 1 0 =c2×Q×(Te 1 -Ts 1 )=4.2×10 3 ×100.42×（51.9-34.47）≈7.35×10 6 W=7.35 MW。
For another example, in other embodiments, the current steady state operating parameters further include a cold fluid specific heat capacity c1 and a cold fluid flow q. The step S200 includes: according to the specific heat capacity c1, the cold fluid flow rate q and the first cold fluid inlet temperature te 1 And a first cold fluid outlet temperature ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 。W 0 =c1×q×(ts 1 -te 1 ). Thus, the cold fluid flow and cold fluid flow using the heat exchangerThe inlet and outlet temperature is calculated to obtain the current heat exchange quantity W 0 。
S300: according to the current heat exchange quantity W 0 First hot fluid inlet temperature Te 1 And a first cold fluid inlet temperature te 1 A first heat exchanger constant A1 is calculated. A1 =w 0 /(Te 1 -te 1 )。
For example, assume W 0 As can be seen from the data in table 1, a1=w=7.35 MW 0 /(Te 1 -te 1 ) = 7.35/(51.9-30) ≈ 0.3356 MW/°C。
S400: according to the current heat exchange quantity W 0 First cold fluid outlet temperature ts 1 And a first hot fluid outlet temperature Ts 1 And calculating to obtain a second heat exchanger constant A2. A2 =w 0 /(ts 1 -Ts 1 )。
For example, assume W 0 As can be seen from the data in table 1, a2=w=7.35 MW 0 /(ts 1 -Ts 1 ) = 7.35/(41.62-34.47) ≈ 1.028 MW/°C。
S500: estimating a target heat exchange amount W of the heat exchanger under a target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating change parameters. The target steady state operating invariant parameters of the heat exchanger at the target operating conditions include a cold fluid flow Q and a hot fluid flow Q.
Specifically, any one or more parameters of a target heat exchange amount and a target steady-state operation change parameter of the heat exchanger under a target operation condition can be preset, and then the unknown parameters under the target operation condition are calculated by combining the first heat exchanger constant A1, the second heat exchanger constant A2 and the preset known parameters under the target operation condition.
The target steady-state operation-invariant parameter refers to a parameter that remains substantially unchanged under the target operation condition and the current operation condition, for example, the cold fluid flow rate under the target operation condition is q 1 The cold fluid flow under the current operation condition is q, if q 1 Over a range of variation of q× (1±5%) then the cold fluid flow can be a target steadyThe constant parameter of the state operation, such as the flow rate Q of the hot fluid under the target operation condition 1 The flow rate of the hot fluid under the current operation condition is Q, if Q 1 In the variation range of Q× (1+ -5%), then the hot fluid flow may be a target steady state operating constant parameter.
According to the technical scheme provided by the embodiment of the application, the heat exchange capacity of the heat exchanger is evaluated by constructing the relation between the first heat exchanger constant and the second heat exchanger constant and the heat exchanger operation parameters and utilizing the first heat exchanger constant and the second heat exchanger constant, so that modeling and complex software operation are not needed, related data such as the target heat exchange amount and the target steady-state operation change parameters can be obtained by utilizing the method on the premise of ensuring accuracy, modeling theoretical calculation errors are avoided by utilizing the actual measurement values, and the accuracy of calculation results is improved.
Fig. 3 is a flow chart of a method for evaluating an operation parameter of a heat exchanger according to another embodiment of the present application. The embodiment shown in fig. 3 is a specific implementation of the embodiment shown in fig. 2. As shown in fig. 3, the difference from the embodiment shown in fig. 2 is that the target steady-state operating variation parameter includes a second hot fluid inlet temperature Te 2 Second hot fluid outlet temperature Ts 2 And a second cold fluid outlet temperature ts 2 Steps S510 to S530 are a specific implementation of step S500 in the embodiment shown in fig. 2.
S510: if the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Changing to target heat exchange amount W under target operation condition 1 And controlling a first cold fluid inlet temperature te 1 Unchanged, according to the target heat exchange quantity W 1 A first heat exchanger constant A1 and a first cold fluid inlet temperature te 1 Calculating to obtain a second thermal fluid inlet temperature Te 2 。Te 2 =W 1 /A1+te 1 。
For example, assuming a1=0.3356 MW/°c, a2=1.028 MW/°c, if the heat exchange amount is to be increased to 10 MW, i.e., W 1 =10 MW, and maintaining a first cold fluid inlet temperature te 1 Unchanged, te is 2 =W 1 /A1+te 1 =10/0.3356+30≈59.79 °C。
S520: according to the target heat exchange quantity W 1 A thermal fluid specific heat capacity c2, a thermal fluid flow rate Q and a second thermal fluid inlet temperature Te 2 Calculating to obtain the second hot fluid outlet temperature Ts 2 。Ts 2 =Te 2 -W 1 /(c2×Q)。
For example, in combination with the above, W 1 = 10 MW = 10×10 6 W，Te 2 = 59.79 °C，c2 = 4.2×10 3 J/(kg×) Q= 100.42kg/s, ts 2 = Te 2 - W 1 /(c2×Q) = 59.79-10×10 6 /(4.2×10 3 ×100.42) ≈ 59.79-23.71=36.08 °C。
S530: according to the target heat exchange quantity W 1 A second heat exchanger constant A2 and a second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 。ts 2 =W 1 /A2+Ts 2 。
For example, in combination with the above, W 1 = 10 MW，A2 = 1.028 MW/°C，Ts 2 =36.08 ℃, ts 2 =W 1 /A2+Ts 2 =10/1.028+36.08 ≈ 9.73+36.08=45.81 °C。
According to the technical scheme provided by the embodiment of the application, the target heat exchange amount under the target operation working condition is set, the cold fluid inlet temperature under the target operation working condition and the current operation working condition is kept unchanged, and the target steady-state operation change parameters such as the second hot fluid inlet temperature, the second hot fluid outlet temperature and the second cold fluid outlet temperature under the target operation working condition can be obtained through simple mathematical calculation according to the first heat exchanger constant and the second heat exchanger constant, so that the accuracy of data in the calculation process is ensured, and the accuracy of the estimated target steady-state operation change parameters is improved.
Fig. 4 is a flow chart of a method for evaluating an operation parameter of a heat exchanger according to another embodiment of the present application. The embodiment of fig. 4 is a specific implementation of the embodiment of fig. 2. As shown in fig. 4, the difference from the embodiment shown in fig. 2 is that the target steady-state operating variation parameter includes a second heatFluid outlet temperature Ts 2 And a second cold fluid outlet temperature ts 2 Steps S540 to S560 are a specific implementation of step S500 in the embodiment shown in fig. 2.
S540: if the heat exchanger is operated under the current operating condition, the first hot fluid inlet temperature Te 1 Changing to the second hot fluid inlet temperature Te under the target operating condition 2 And controlling a first cold fluid inlet temperature te 1 Unchanged according to the second hot fluid inlet temperature Te 2 A first heat exchanger constant A1 and a first cold fluid inlet temperature te 1 Calculating to obtain the target heat exchange quantity W of the heat exchanger under the target operation condition 1 。W 1 =A1×(Te 2 -te 1 )。
For example, assuming that the highest hot fluid inlet temperature that the heat exchanger can withstand is 90 ℃, the cold fluid inlet temperature remains unchanged, i.e., the second hot fluid inlet temperature Te at the target operating condition 2 =90 °C，te 1 =30 ℃, W assuming a1=0.3356 MW/° C 1 =A1×(Te 2 -te 1 )= 0.3356×(90-30)=20.136 MW。
S550: according to the second hot fluid inlet temperature Te 2 Target heat exchange amount W 1 The specific heat capacity c2 of the hot fluid and the flow rate Q of the hot fluid are calculated to obtain the outlet temperature Ts of the second hot fluid 2 。Ts 2 =Te 2 -W 1 /(c2×Q)。
For example, assume Te 2 =90°C，W 1 =20.136MW=2.0136×10 7 W，c2=4.2×10 3 J/(kg×) Q= 100.42kg/s, ts 2 = Te 2 -W 1 /(c2×Q) = 90-2.0136´10 7 /(4.2×10 3 ×100.42) ≈ 90-47.74=42.26 °C。
S560: according to the target heat exchange quantity W 1 A second heat exchanger constant A2 and a second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 。ts 2 =W 1 /A2+Ts 2 。
For example, in combination with the above, W 1 =20.136 MW，A2=1.028 MW/°C，Ts 2 =42.26 C, ts 2 =W 1 /A2+Ts 2 =20.136/1.028+42.26≈61.85 °C。
According to the technical scheme provided by the embodiment of the application, the target heat exchange amount under the target operation working condition and the target steady-state operation change parameters such as the second hot fluid outlet temperature and the second cold fluid outlet temperature can be obtained through simple mathematical calculation according to the first heat exchanger constant A1 and the second heat exchanger constant A2 by setting the second hot fluid inlet temperature under the target operation working condition and keeping the cold fluid inlet temperature under the target operation working condition and the current operation working condition unchanged, and the accuracy of the data in the calculation process is ensured, so that the accuracy of the estimated target heat exchange amount and the estimated target steady-state operation change parameters is improved.
Fig. 5 is a flowchart illustrating a method for evaluating an operation parameter of a heat exchanger according to still another embodiment of the present application. The embodiment of fig. 5 is a specific implementation of the embodiment of fig. 2. As shown in fig. 5, the difference from the embodiment shown in fig. 2 is that the target steady-state operating variation parameters include a second cold fluid inlet temperature te 2 And a second cold fluid outlet temperature ts 2 Steps S570 to S590 are a specific implementation of step S500 in the embodiment shown in fig. 2.
S570: if the heat exchanger is operated under the current operating condition, the first hot fluid inlet temperature Te 1 Changing to the second hot fluid inlet temperature Te under the target operating condition 2 And controlling a second hot fluid outlet temperature Ts of the heat exchanger at the target operating condition 2 Not exceeding the preset value S, according to the second hot fluid inlet temperature Te 2 Second hot fluid outlet temperature Ts 2 The specific heat capacity c2 of the hot fluid and the flow Q of the hot fluid are calculated to obtain the target heat exchange quantity W of the heat exchanger under the target operation working condition 1 Is set to a threshold value of (2). W (W) 1 =c2×Q×(Te 2 -Ts 2 ),Ts 2 =S。
For example, a second hot fluid inlet temperature Te at the target operating condition is required 2 At 60 ℃ and a second hot fluid outlet temperature Ts 2 Not exceeding 35 ℃, i.e. the preset value s=35 ℃, assuming c2=4.2×10 3 J/(kg×) Q= 100.42kg/s, then W 1 =c2×Q×(Te 2 -Ts 2 )= 4.2×10 3 ×100.42×(60-35)/10 6 ≈ 10.54 MW。
S580: according to the second hot fluid inlet temperature Te 2 Target heat exchange amount W 1 And a first heat exchanger constant A1, to calculate a second cold fluid inlet temperature te 2 Is set to a threshold value of (2). te 2 =Te 2 -W 1 /A1。
For example, if Te 2 =60 °C，W 1 =10.54 mw, a1=0.3356 MW/° C, then te 2 =Te 2 -W 1 /A1=60-10.54/0.3356≈ 28.6 °C。
S590: according to the target heat exchange quantity W 1 A second heat exchanger constant A2 and a second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 Is set to a threshold value of (2). ts 2 =W 1 /A2+Ts 2 ，Ts 2 =S。
For example, W 1 =10.54 MW，A2=1.028 MW/°C，Ts 2 =35 ℃, ts 2 = W 1 /A2+Ts 2 = 10.54/1.028+35≈ 45.25 °C。
According to the technical scheme provided by the embodiment of the application, the second hot fluid inlet temperature Te under the target operation condition is set 2 And the second hot fluid outlet temperature Ts under the target operation condition is set 2 And if the preset value S is not exceeded, according to the first heat exchanger constant A1 and the second heat exchanger constant A2, a threshold value of the target heat exchange amount under the target operation working condition and target steady-state operation change parameters such as a threshold value of the second cold fluid inlet temperature and a threshold value of the second cold fluid outlet temperature can be obtained through simple mathematical calculation, and the accuracy of the data in the calculation process is ensured, so that the accuracy of the estimated target heat exchange amount and the estimated target steady-state operation change parameters is improved.
Fig. 6 is a flowchart illustrating a method for evaluating an operation parameter of a heat exchanger according to another embodiment of the application. FIG. 7 is a graph showing the thermal fluid inlet temperature profile of the spent fuel pool calculated according to the evaluation method of the embodiment of FIG. 6. The embodiment of fig. 6 is a specific implementation of the embodiment of fig. 2. As shown in fig. 6, the difference from the embodiment shown in fig. 2 is that step S5100 is a specific implementation of step S500 in the embodiment shown in fig. 2.
S5100: if the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Changing to target heat exchange amount W under target operation condition 1 And controlling a first cold fluid inlet temperature te 1 And if the temperature is unchanged, calculating a change curve of the inlet temperature Te of the hot fluid at different moments in the process of adjusting the current operation condition to the target operation condition according to the first heat exchanger constant A1.
For example, a target heat exchange amount W of a spent fuel pool of a nuclear power plant is set to be required under a target operation condition 1 =6.25 MW, and maintaining a first cold fluid inlet temperature te 1 =30deg.C, the first hot fluid inlet temperature Te under the current operating conditions 1 =40 ℃, a1=0.3356 MW/° C, then the current heat exchange amount W under the current operating condition 0 =A1×（Te 1 -te 1 ) =0.3356× (40-30) = 3.356MW, the remainder not carrying heat W' =6.25-W 0 Time interval t is 0.25h, according to spent fuel pool water content (e.g., m= 1104000 kg), the remaining non-carried heat W' may result in spent fuel pool temperature rise rate of: Δt1=w'/(c2×m) = 0.00062444 ℃/s. When t1=0.25 h can be calculated, the spent fuel pool temperature rises by Δt=Δt1×t= 0.00062444 ×0.25×3600=0.562 ℃, at which point the spent fuel pool temperature is 40.562 ℃.
When Te '= 40.562 ℃, the heat exchange amount w″ at this time=a1× (Te' -Te 1 ) When t2 = 0.5h is calculated according to the water content of the spent fuel pool, the temperature of the spent fuel pool rises by 0.525 ℃ and is 41.087 ℃ at the moment, and the remaining heat quantity W ' ' ' = 6.25-W ' ' = 2.705MW is not carried out by 0.3356× (40.562-30) = 3.545 MW. And the temperature of the spent fuel pool at different moments can be calculated by analogy.
When Te is 2 When t=19h at 48.623 ℃, the heat exchange amount W at this time 1 =A1×(Te 2 -te 1 ) =0.3356× (48.623-30) =6.25 MW, the remainder not being carried overHeat w=6.25-W 1 =0 MW, at this time spent fuel pool temperature was warmed. The spent fuel pool temperature variation curve of this process is shown in fig. 7.
According to the technical scheme provided by the embodiment of the application, the target heat exchange quantity W under the target operation condition is set 1 And controlling a first cold fluid inlet temperature te 1 And if the temperature of the hot fluid inlet Te is unchanged, a change curve of the temperature of the hot fluid inlet Te at different moments in the process of adjusting the current operation condition to the target operation condition can be obtained through simple mathematical calculation according to the first heat exchanger constant A1, so that the change condition of the temperature of the hot fluid inlet is accurately evaluated.
It should be noted that the embodiment shown in fig. 6 is merely exemplary, and a change curve such as a hot fluid outlet temperature or a cold fluid outlet temperature may also be estimated based on a similar estimation method of the embodiment shown in fig. 6.
Fig. 8 is a schematic structural diagram of an apparatus for evaluating an operation parameter of a heat exchanger according to an embodiment of the present application. The evaluation device 100 comprises an acquisition module 110, a calculation module 120 and an evaluation module 130. The obtaining module 110 is configured to obtain a current steady-state operation parameter of the heat exchanger under a current operation condition, and obtain a current heat exchange amount W of the heat exchanger under the current operation condition 0 The current steady state operating parameters include a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 And a first hot fluid outlet temperature Ts 1 . The calculation module 120 is used for calculating the current heat exchange amount W 0 First hot fluid inlet temperature Te 1 And a first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchanger constant A1 according to the current heat exchange quantity W 0 First cold fluid outlet temperature ts 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain a second heat exchanger constant A2, A1=W 0 /(Te 1 -te 1 )，A2=W 0 /(ts 1 -Ts 1 ). The evaluation module 130 is configured to evaluate a target heat exchange amount W of the heat exchanger under the target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And target steady state operationAt least one of the line change parameters.
It should be noted that, the evaluation device is a device corresponding to the evaluation method of the heat exchanger operation parameter provided in the embodiment of the present application, so each module in the evaluation device may implement a corresponding evaluation method, and the evaluation device may at least implement the corresponding technical effects described above, which will not be described herein.
Fig. 9 is a block diagram of an electronic device according to an embodiment of the present application.
Referring to fig. 9, the electronic device 10 includes a processor 11 and a memory 12. The memory 12 is used to store instructions, such as application programs, that are executable by the processor 11. The number of processors 11 may be one or more. The application program stored in the memory 12 may include one or more modules each corresponding to a set of instructions. Further, the processor 11 is configured to execute instructions to perform the above-described method of evaluating heat exchanger operating parameters.
The electronic device 10 may also include a power component configured for power management of the electronic device 10, a wired or wireless network interface configured to connect the electronic device 10 to a network, and an input output (I/O) interface. The electronic device 10 may operate an operating system, such as Windows Server, based on storage in the memory 12 TM ，Mac OSX TM ，Unix TM ，Linux TM ，FreeBSD TM Or the like.
A non-transitory computer readable storage medium, which when executed by a processor of the electronic device 10, enables the electronic device 10 to perform a method of assessing heat exchanger operating parameters. The evaluation method is executed by an agent program, and the evaluation method includes: acquiring a current steady-state operation parameter of the heat exchanger under a current operation condition, wherein the current steady-state operation parameter comprises a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 And a first hot fluid outlet temperature Ts 1 The method comprises the steps of carrying out a first treatment on the surface of the Acquiring current heat exchange quantity W of heat exchanger under current operation condition 0 The method comprises the steps of carrying out a first treatment on the surface of the According to the current heat exchange quantity W 0 First hot fluid inlet temperature Te 1 And a first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchanger constant A1, A1=W 0 /(Te 1 -te 1 ) The method comprises the steps of carrying out a first treatment on the surface of the According to the current heat exchange quantity W 0 First cold fluid outlet temperature ts 1 And a first hot fluid outlet temperature Ts 1 Calculating to obtain a second heat exchanger constant A2, A2=W/(ts) 1 -Ts 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Estimating a target heat exchange amount W of the heat exchanger under a target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating change parameters.
Those of ordinary skill in the art will appreciate that the algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed computing method and computing device may be implemented in other manners. For example, the above-described embodiments of the computing device are merely illustrative, e.g., the division of the modules is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple modules may be combined or integrated into another system, or some features may be omitted, or not performed.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program verification codes.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the computing device and the electronic apparatus described above may refer to the corresponding processes in the foregoing computing method embodiments, which are not described herein again.
It should be noted that, the combination of the technical features in the embodiment of the present application is not limited to the combination described in the embodiment of the present application or the combination described in the specific embodiment, and all the technical features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (8)
1. A method of evaluating an operating parameter of a heat exchanger, comprising:
obtaining a current steady-state operation parameter of the heat exchanger under a current operation condition, wherein the current steady-state operation parameter comprises a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 First hot fluid outlet temperature Ts 1 Cold fluid flow Q and hot fluid flow Q;
acquiring the current heat exchange quantity W of the heat exchanger under the current operation condition 0 ；
According to the current heat exchange quantity W 0 The first hot fluid inlet temperature Te 1 And the first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchangeA constant A1, wherein a1=w 0 /(Te 1 -te 1 )；
According to the current heat exchange quantity W 0 Said first cold fluid outlet temperature ts 1 And the first thermal fluid outlet temperature Ts 1 A second heat exchanger constant A2 is calculated, wherein a2=w 0 /(ts 1 -Ts 1 )；
Estimating a target heat exchange amount W of the heat exchanger under a target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady-state operating variation parameters, wherein the target steady-state operating invariant parameters of the heat exchanger under target operating conditions include the cold fluid flow Q and the hot fluid flow Q;
wherein the current heat exchange quantity W of the heat exchanger under the current operation condition is obtained 0 Comprising the following steps:
according to the specific heat capacity c1 of the cold fluid, the flow rate q of the cold fluid and the inlet temperature te of the first cold fluid 1 And the first cold fluid outlet temperature ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Wherein W is 0 ＝c1×q×(ts 1 -te 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
According to the specific heat capacity c2 of the hot fluid, the flow rate Q of the hot fluid and the inlet temperature Te of the first hot fluid 1 And the first thermal fluid outlet temperature Ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Wherein W is 0 ＝c2×Q×(Te 1 -Ts 1 )。
2. The method of evaluation according to claim 1, wherein the target steady-state operating variation parameter comprises a second hot fluid inlet temperature Te 2 Second hot fluid outlet temperature Ts 2 And a second cold fluid outlet temperature ts 2 Wherein the estimating the target heat exchange amount of the heat exchanger under the target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2W 1 And at least one of target steady state operating variation parameters, comprising:
if the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Changing to target heat exchange amount W under target operation condition 1 And controlling the first cold fluid inlet temperature te 1 Unchanged, according to the target heat exchange amount W 1 The first heat exchanger constant A1 and the first cold fluid inlet temperature te 1 Calculating the inlet temperature Te of the second hot fluid 2 Wherein Te is 2 ＝W 1 /A1+te 1 ；
According to the target heat exchange amount W 1 A thermal fluid specific heat capacity c2, the thermal fluid flow Q and the second thermal fluid inlet temperature Te 2 Calculating the second hot fluid outlet temperature Ts 2 Wherein, the method comprises the steps of, wherein,
Ts 2 ＝Te 2 -W 1 /(c2×Q)；
according to the target heat exchange amount W 1 The second heat exchanger constant A2 and the second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 Wherein ts is 2 ＝W 1 /A2+Ts 2 。
3. The method of evaluation according to claim 1, wherein the target steady-state operating variation parameter comprises a second hot fluid outlet temperature Ts 2 And a second cold fluid outlet temperature ts 2 Wherein the target heat exchange amount W of the heat exchanger under the target operation condition is estimated according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, comprising:
if the first hot fluid inlet temperature Te of the heat exchanger is set at the current operating condition 1 Changing to the second hot fluid inlet temperature Te under the target operating condition 2 And controlling a first cold fluid inlet temperature te 1 Invariable, according to the second hot fluid inlet temperature Te 2 The first mentionedHeat exchanger constant A1 and said first cold fluid inlet temperature te 1 Calculating to obtain the target heat exchange quantity W of the heat exchanger under the target operation condition 1 Wherein W is 1 ＝A1×(Te 2 -te 1 )；
According to the second hot fluid inlet temperature Te 2 The target heat exchange amount W 1 The specific heat capacity c2 of the hot fluid and the flow rate Q of the hot fluid are calculated to obtain the outlet temperature Ts of the second hot fluid 2 Wherein, the method comprises the steps of, wherein,
Ts 2 ＝Te 2 -W 1 /(c2×Q)；
according to the target heat exchange amount W 1 The second heat exchanger constant A2 and the second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 Wherein ts is 2 ＝W 1 /A2+Ts 2 。
4. The method of evaluation according to claim 1, wherein the target steady state operating variation parameter comprises a second cold fluid inlet temperature te 2 And a second cold fluid outlet temperature ts 2 Wherein the target heat exchange amount W of the heat exchanger under the target operation condition is estimated according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, comprising:
if the first hot fluid inlet temperature Te of the heat exchanger is set at the current operating condition 1 Changing to the second hot fluid inlet temperature Te under the target operating condition 2 And controlling a second hot fluid outlet temperature Ts of the heat exchanger at the target operating condition 2 Not exceeding a preset value S, according to the second hot fluid inlet temperature Te 2 The second hot fluid outlet temperature Ts 2 The specific heat capacity c2 of the hot fluid and the flow Q of the hot fluid are calculated to obtain the target heat exchange quantity W of the heat exchanger under the target operation working condition 1 Wherein W is 1 ＝c2×Q×(Te 2 -Ts 2 ),Ts 2 ＝S；
According to the second hot fluid inlet temperature Te 2 The target heat exchange amount W 1 And the first heat exchanger constant A1, to calculate the second cold fluid inlet temperature te 2 Wherein te is 2 ＝Te 2 -W 1 /A1；
According to the target heat exchange amount W 1 Is set to a threshold value of (1), the second heat exchanger constant A2 and the second hot fluid outlet temperature Ts 2 Calculating the second cold fluid outlet temperature ts 2 Of (c), wherein ts 2 ＝W 1 /A2+Ts 2 ，Ts 2 ＝S。
5. The evaluation method according to claim 1, wherein the target heat exchange amount W of the heat exchanger under the target operation condition is evaluated based on the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, comprising:
if the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Changing to target heat exchange amount W under target operation condition 1 And controlling the first cold fluid inlet temperature te 1 And if the temperature of the hot fluid inlet is unchanged, calculating a change curve of the temperature of the hot fluid inlet at different moments in the process of adjusting from the current operation condition to the target operation condition according to the first heat exchanger constant A1.
6. An apparatus for evaluating an operating parameter of a heat exchanger, comprising:
the acquisition module is used for acquiring the current steady-state operation parameters of the heat exchanger under the current operation condition and acquiring the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Wherein the current steady state operating parameters include a first cold fluid inlet temperature te 1 First cold fluid outlet temperature ts 1 First hot fluid inlet temperature Te 1 First hot fluid outlet temperature Ts 1 The cold fluid flow Q and the hot fluid flow Q are also used for the followingSpecific heat capacity c1 of cold fluid, flow rate q of cold fluid, inlet temperature te of first cold fluid 1 And the first cold fluid outlet temperature ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Wherein W is 0 ＝c1×q×(ts 1 -te 1 ) Alternatively, the first thermal fluid inlet temperature Te is determined based on the thermal fluid specific heat capacity c2, the thermal fluid flow Q, and the first thermal fluid inlet temperature Te 1 And the first thermal fluid outlet temperature Ts 1 Calculating to obtain the current heat exchange quantity W of the heat exchanger under the current operation condition 0 Wherein W is 0 ＝c2×Q×(Te 1 -Ts 1 )；
A calculation module for calculating the current heat exchange amount W 0 The first hot fluid inlet temperature Te 1 And the first cold fluid inlet temperature te 1 Calculating to obtain a first heat exchanger constant A1, and according to the current heat exchange amount W 0 Said first cold fluid outlet temperature ts 1 And the first thermal fluid outlet temperature Ts 1 A second heat exchanger constant A2 is calculated, wherein a1=w/(Te) 1 -te 1 )，A2＝W/(ts 1 -Ts 1 )；
An evaluation module for evaluating a target heat exchange amount W of the heat exchanger under a target operation condition according to the first heat exchanger constant A1 and the second heat exchanger constant A2 1 And at least one of target steady state operating variation parameters, wherein the target steady state operating invariant parameters of the heat exchanger at target operating conditions comprise the cold fluid flow Q and the hot fluid flow Q.
7. A computer readable storage medium having stored thereon computer executable instructions which when executed by a processor implement a method of assessing a heat exchanger operating parameter according to any of claims 1 to 5.
8. An electronic device, comprising:
a processor for performing the method of assessing a heat exchanger operating parameter of any one of claims 1 to 5; and
and the memory is used for storing executable instructions of the processor.
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