CN107402228A - A kind of monitoring system and method for nuclear power station heat exchanger heat exchange property - Google Patents
A kind of monitoring system and method for nuclear power station heat exchanger heat exchange property Download PDFInfo
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- CN107402228A CN107402228A CN201610339698.9A CN201610339698A CN107402228A CN 107402228 A CN107402228 A CN 107402228A CN 201610339698 A CN201610339698 A CN 201610339698A CN 107402228 A CN107402228 A CN 107402228A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention discloses a kind of monitoring system and method for nuclear power station heat exchanger heat exchange property, monitoring system includes the first temperature sensor, second temperature sensor, three-temperature sensor, the 4th temperature sensor, first flowmeter, second flowmeter, analog-digital converter and PC, the flow rate calculation for temperature and the flowmeter detection that PC detects according to each temperature sensor obtains the KA values of heat exchanger to be monitored, then dirtiness resistance is calculated using KA values, by the monitoring that dirtiness resistance is realized to heat exchanging device heat exchange property compared with predetermined upper threshold value.The present invention is evaluated using the heat exchange property of dirtiness resistance substitution KA value heat exchanging devices, due to during dirtiness resistance is calculated using KA values, the influence of cold fluid and hot fluid suction parameter and physical parameter is eliminated, enable dirtiness resistance directly to reflect Fouling Properties, therefore greatly improved using the accuracy of the heat exchange property influence of dirtiness resistance evaluation dirt heat exchanging device.
Description
Technical field
The present invention relates to technical field of heat exchangers, in particular, is related to a kind of nuclear power station heat exchanger heat exchange
The monitoring system and method for performance.
Background technology
Heat exchanger is as nuclear island low-temperature receiver, in unit running process, taking away each user's production of nuclear island in time
Raw heat, to ensure the normal work of nuclear island.The both sides of heat exchanger be referred to as target fluid side and
Aid in fluid side (i.e. seawater side).Because the auxiliary fluid side of heat exchanger often has marine growth and various miscellaneous
Matter enters, therefore easily causes heat exchanger pollution, the heat transfer efficiency of heat exchanger is reduced, so as to influence nuclear island
The discharge of heat.So to ensure the normal work of nuclear island, the heat exchange property of regular heat exchanging device is needed to carry out
Monitoring.
At present, the product of generally use total exchange coefficient of the heat exchanger and heat transfer area (i.e. Composite Walls KA
Value) heat exchange property of heat exchanging device evaluated.But because KA values are by cold fluid and hot fluid (i.e. target stream
Body and auxiliary fluid) suction parameter and physical parameter have a great influence, and it can not directly reflect dirt spy
Property, therefore, there is larger error in the influence that the heat exchange property of dirt heat exchanging device is evaluated using KA values.
The content of the invention
In view of this, the present invention discloses a kind of monitoring system and method for nuclear power station heat exchanger heat exchange property,
To solve, because KA values can not directly reflect Fouling Properties, to cause changing using KA values evaluation dirt heat exchanging device
The problem of larger error be present in the influence of hot property.
A kind of monitoring system of nuclear power station heat exchanger heat exchange property, including：
The entrance point of the target fluid of heat exchanger to be monitored is arranged on, for detecting target fluid inlet temperature
The first temperature sensor；
The port of export of the target fluid is arranged on, for detecting the second temperature of target fluid outlet temperature
Sensor；
The entrance point of the auxiliary fluid of the heat exchanger to be monitored is arranged on, fluid inlet is aided in for detecting
The three-temperature sensor of temperature；
The port of export of the auxiliary fluid is arranged on, for detecting the 4th temperature of secondary fluid outlet temperature
Sensor；
The entrance point of the target fluid is arranged on, for detecting the first flow of target fluid inlet flow rate
Meter；
The entrance point of the auxiliary fluid is arranged on, for detecting the second flow of auxiliary fluid inlet flow rate
Meter；
Input passes with first temperature sensor, the second temperature sensor, the 3rd temperature respectively
The analog-to-digital conversion that sensor, the 4th temperature sensor, the first flowmeter connect with the second flowmeter
Device, the analog-digital converter are used for the target fluid inlet temperature of analog signal form, the mesh
Mark fluid outlet temperature, the auxiliary fluid inlet temperature, the secondary fluid outlet temperature, the mesh
Mark fluid inlet flow and the auxiliary fluid inlet flow rate be converted into corresponding to digital signal form and defeated
Go out；
The PC that input is connected with the output end of the analog-digital converter, the PC are used to obtain institute
State target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid inlet temperature, institute
State secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate, profit
With the target fluid inlet temperature, the target fluid outlet temperature, it is described auxiliary fluid inlet temperature,
The secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate meter
Calculation obtains the Composite Walls KA values of the heat exchanger to be monitored, and dirt is calculated according to the KA values
The magnitude relationship of thermal resistance, the dirtiness resistance and predetermined upper threshold value, and based on comparative result to institute
The heat exchange property for stating heat exchanger to be detected is monitored.
Preferably, the analog-digital converter is connected by input/output end port with the PC.
Preferably, in addition to：Feedforward controller；
The input of the feedforward controller is connected with the output end of the PC, and the feedforward controller is used
Changed in receiving the PC according to auxiliary fluid inlet temperature variable quantity and/or auxiliary fluid inlet flow rate
The valve regulated aperture measured, and according to the valve regulated aperture regulation by-pass line valve, change
The flow of the auxiliary fluid.
A kind of monitoring method of nuclear power station heat exchanger heat exchange property, applied in monitoring system described above
PC, the monitoring method includes：
Obtain target fluid inlet temperature, target fluid outlet temperature, auxiliary fluid inlet temperature, auxiliary
Fluid outlet temperature, target fluid inlet flow rate and auxiliary fluid inlet flow rate；
Entered according to the target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid
Mouth temperature, the secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid enter
Mouthful flow, the Composite Walls KA values of the heat exchanger to be monitored when being calculated fluid stable；
According to formula (1), dirtiness resistance is calculated by the KA values, the expression formula of formula (1) is：
R=KA-1-1/h1-1/h2-δ/λp(1)；
In formula, R is the dirtiness resistance, h1For the target fluid side coefficient of heat transfer, h2Changed for auxiliary fluid side
Hot coefficient, δ are block board thickness, λpFor dividing plate thermal conductivity factor；
Judge whether the dirtiness resistance exceedes predetermined upper threshold value；
If it is, output prompt message, the prompt message is used to prompt heat exchange to be monitored described in user
The heat exchange property of device is unsatisfactory for demand, and the heat exchanger to be monitored need to be cleaned；
If it is not, then preserving the data of this running generation, and correct existing theoretical dirtiness resistance
Mathematical modeling.
Preferably, according to the target fluid inlet temperature, the target fluid outlet temperature, described auxiliary
Help fluid inlet temperature, the secondary fluid outlet temperature, the target fluid inlet flow rate and described auxiliary
Fluid inlet flow is helped, the Composite Walls KA values of the heat exchanger to be monitored when fluid stable is calculated are wrapped
Include：
When the fluid of the heat exchanger both sides to be monitored is in stable state, to the target fluid inlet temperature,
The target fluid outlet temperature, it is described auxiliary fluid inlet temperature, the secondary fluid outlet temperature,
The target fluid inlet flow rate and the auxiliary fluid inlet flow rate use heat exchanger logarithm under limit
Mean temperature difference method, the KA values of the heat exchanger to be monitored when being calculated fluid stable；
When the fluid of the heat exchanger both sides to be monitored is in dynamic, pre-stored heat exchanger dynamic is called
Heat transfer model；
By the target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid inlet
Temperature, the secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet
Input initial value of the flow as the heat exchanger Dynamic Heat Transfer, is calculated institute during fluid stable
State the KA values of heat exchanger to be monitored.
Preferably, it is described to preserve the data of this running generation, and correct existing theoretical dirt heat
After hindering mathematical modeling, in addition to：
The dirtiness resistance being calculated according to this and the dirtiness resistance for calculating and storing before, are obtained
To the dirtiness resistance model for characterizing dirtiness resistance growth trend.
Preferably, when monitoring system also includes feedforward controller, the monitoring method also includes：
When the heat exchanger to be monitored is in running status, whether the auxiliary fluid inlet temperature is judged
Whether exceed preset flow threshold value more than preset temperature threshold value, or the auxiliary fluid inlet flow rate；
If it is, pre-stored heat exchanger Dynamic Heat Transfer is called, and in the auxiliary fluid inlet
When temperature exceedes the preset temperature threshold value, auxiliary is calculated according to the heat exchanger Dynamic Heat Transfer
Fluid inlet temperature variable quantity, and exceed the preset flow threshold value in the auxiliary fluid inlet flow rate
When, auxiliary fluid inlet flow rate variable quantity is calculated according to the heat exchanger Dynamic Heat Transfer；
Fluid inlet temperature variable quantity and/or the auxiliary fluid inlet flow rate variable quantity are aided according to described,
From pre-stored valve opening adjustment curve, corresponding valve regulated aperture is found；
The valve regulated aperture is converted into corresponding electric signal to send to the feedforward controller, so that
The feedforward controller changes the flow for aiding in fluid according to the valve regulated aperture regulation valve.
It can be seen from the above technical scheme that the invention discloses a kind of nuclear power station heat exchanger heat exchange property
Monitoring system and method, monitoring system include the first temperature sensor, second temperature sensor, the 3rd
Temperature sensor, the 4th temperature sensor, first flowmeter, second flowmeter, analog-digital converter and PC
Machine, the flow rate calculation for temperature and the flowmeter detection that PC detects according to each temperature sensor obtain waiting to supervise
Survey heat exchanger KA values, dirtiness resistance then is calculated using KA values, by by dirtiness resistance and preset
Upper limit threshold is compared the monitoring for realizing heat exchanging device heat exchange property.As can be seen that the present invention is using dirty
The heat exchange property of dirty thermal resistance substitution KA value heat exchanging devices is evaluated, due to dirt is being calculated using KA values
During dirty thermal resistance, the influence of cold fluid and hot fluid suction parameter and physical parameter has been eliminated, therefore has been made
Fouling Properties can directly be reflected by obtaining dirtiness resistance.So KA values evaluation dirt pair is replaced using dirtiness resistance
The accuracy that the heat exchange property of heat exchanger influences greatly improves, and then improves heat exchanging device heat exchange property prison
The reliability of survey.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to reality
The required accompanying drawing used in example or description of the prior art is applied to be briefly described, it should be apparent that, below
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, other accompanying drawings can also be obtained by accompanying drawing disclosed in.
Fig. 1 is a kind of control of the monitoring system of nuclear power station heat exchanger heat exchange property disclosed in the embodiment of the present invention
Schematic diagram processed；
Fig. 2 is a kind of monitoring method flow of nuclear power station heat exchanger heat exchange property disclosed in the embodiment of the present invention
Figure；
Fig. 3 is the monitoring system of another nuclear power station heat exchanger heat exchange property disclosed in the embodiment of the present invention
Control principle drawing.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present invention, and
The embodiment being not all of.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out under the premise of creative work the every other embodiment obtained, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of monitoring system and method for nuclear power station heat exchanger heat exchange property, with
Solve because KA values can not directly reflect Fouling Properties, to cause the heat exchange using KA values evaluation dirt heat exchanging device
The problem of larger error be present in the influence of performance.
Referring to Fig. 1, a kind of monitoring system of nuclear power station heat exchanger heat exchange property disclosed in the embodiment of the present invention
Control principle drawing, wherein, the dotted line in Fig. 1 represents the transfer route of the signal for logic control, solid line
Pipeline fluid is represented, monitoring system includes：
First temperature sensor 1, second temperature sensor 2, three-temperature sensor 3, the 4th TEMP
Device 4, first flowmeter 5, second flowmeter 6, analog-digital converter 7 and PC (personal computer, it is individual
People's computer) machine 8；
The annexation and operation principle of each part of monitoring system are specific as follows：
First temperature sensor 1 is arranged on the entrance point of the target fluid of heat exchanger 11 to be monitored, for detecting
Target fluid inlet temperature；
Second temperature sensor 2 is arranged on the port of export of target fluid, for detecting target fluid outlet temperature
Degree；
Three-temperature sensor 3 is arranged on the entrance point of the auxiliary fluid of heat exchanger 11 to be monitored, for detecting
Aid in fluid inlet temperature；
4th temperature sensor 4 is arranged on the port of export of auxiliary fluid, for detecting secondary fluid outlet temperature
Degree；
First flowmeter 5 is arranged on the entrance point of target fluid, for detecting target fluid inlet flow rate；
Second flowmeter 6 is arranged on the entrance point of auxiliary fluid, and fluid inlet flow rate is aided in for detecting；
The input of analog-digital converter 7 respectively with the first temperature sensor 1, second temperature sensor 2,
Three-temperature sensor 3, the 4th temperature sensor 4, first flowmeter 5 and second flowmeter 6 connect,
Analog-digital converter 7 is used for the target fluid inlet temperature of analog signal form, the target fluid
Outlet temperature, the auxiliary fluid inlet temperature, the secondary fluid outlet temperature, the target fluid
Inlet flow rate and the auxiliary fluid inlet flow rate are converted into corresponding digital signal form and exported；
The input of PC 8 is connected with the output end of analog-digital converter 7, and PC 8 is described for obtaining
Target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid inlet temperature, described
Secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate, are utilized
The target fluid inlet temperature, the target fluid outlet temperature, it is described auxiliary fluid inlet temperature,
The secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate meter
Calculation obtains the Composite Walls KA values of the heat exchanger to be monitored, and dirt is calculated according to the KA values
The magnitude relationship of thermal resistance, the dirtiness resistance and predetermined upper threshold value, and based on comparative result to institute
The heat exchange property for stating heat exchanger to be detected is monitored.
As can be seen that the monitoring system heat exchanging device of nuclear power station heat exchanger heat exchange property disclosed by the invention changes
The monitoring of hot property mainly by cold fluid and hot fluid import and export parameter (including：Target fluid inlet temperature,
Target fluid outlet temperature, auxiliary fluid inlet temperature, secondary fluid outlet temperature, target fluid import
Flow and auxiliary fluid inlet flow rate) measurement and correlation computations realize, using monitoring system heat exchanging device
Heat exchange property monitoring process it is specific as follows：
Referring to Fig. 2, a kind of monitoring method stream of nuclear power station heat exchanger heat exchange property disclosed in the embodiment of the present invention
Cheng Tu, the monitoring method are applied to the PC 8 in monitoring system, and the monitoring method includes step：
Step S11, cold fluid and hot fluid inlet and outlet parameter is obtained；
Specifically, cold fluid and hot fluid inlet and outlet parameter includes：Obtain target fluid inlet temperature, target fluid
Outlet temperature, auxiliary fluid inlet temperature, secondary fluid outlet temperature, target fluid inlet flow rate and auxiliary
Help fluid inlet flow.
Step S12, the heat exchanger to be monitored when fluid stable is calculated in parameter is imported and exported according to cold fluid and hot fluid
Composite Walls KA values；
Wherein, it is those skilled in the art to import and export parameter the processes of KA values is calculated according to cold fluid and hot fluid
It is known, therefore the present invention will not be repeated here.
Step S13, according to formula (1), dirtiness resistance, formula (1) are calculated by the KA values
Expression formula be：
R=KA-1-1/h1-1/h2-δ/λp(1)；
In formula, R is the dirtiness resistance, h1For the target fluid side coefficient of heat transfer, h2Changed for auxiliary fluid side
Hot coefficient, δ are block board thickness, λpFor dividing plate thermal conductivity factor.
It should be noted that as can be seen that dirt heat is being calculated using KA values from formula (1)
During resistance, cold fluid and hot fluid suction parameter (including target fluid side coefficient of heat transfer h has been eliminated1With
Aid in fluid side coefficient of heat transfer h2) and physical parameter (block board thickness δ and dividing plate thermal conductivity factor λp) shadow
Ring, hence in so that dirtiness resistance can directly reflect Fouling Properties.
Due to target fluid side coefficient of heat transfer h1With auxiliary fluid side coefficient of heat transfer h2To ask for process identical, because
This, the present invention by fluid side coefficient of heat transfer h ask for process exemplified by be described in detail, it is specific as follows：
Known fluid parameter：Flow thermal conductivity coefficient λ, kinematic viscosity ν, tube fluid Prandtl number Pr, fluid body
Product flow Qv, fluid passage section product A, unit interchannel are away from for w；
Rate of flow of fluid V then can be obtained according to formula (2), formula (2) is specific as follows：
V=Qv/A (2)；
Unit passage equivalent diameter d can be obtained according to formula (3)e, formula (3) is specific as follows：
de≈2w (3)；
Fluid Reynolds number R can be obtained according to formula (4)e, formula (4) is specific as follows：
Re=deV/ν (4)；
Nu-number N can be obtained according to formula (5)u, formula (5) is specific as follows：
Nu=CRe n·Pr 0.3or0.4(5)；
Wherein, in formula (5), undetermined parameter C and n need to be determined by testing, in the early stage using formula (6)
Shown empirical equation, formula (6) are specific as follows：
Nu=0.349Re 0.641Pr 0.3(6)；
Therefore, fluid side coefficient of heat transfer h can be obtained according to formula (7), formula (7) is specific as follows：
H=Nuλ/de (7)。
Step S14, judge whether the dirtiness resistance exceedes predetermined upper threshold value, if it is, performing step
Rapid S15, otherwise, perform step S16；
Wherein, according to depending on being actually needed, the present invention does not limit predetermined upper threshold value herein.
Step S15, prompt message is exported；
Wherein, the prompt message is used to prompt the heat exchange property of heat exchanger 11 to be monitored described in user to be discontented with
Sufficient demand, heat exchanger 11 to be monitored need to be cleaned.
It is understood that after heat exchanger 11 to be monitored cleans completion and returns dress, PC 8 can pass through each temperature
Degree sensor and flowmeter obtain cold fluid and hot fluid inlet and outlet parameter again, with to returning the heat exchange to be detected after filling
The heat exchange property of device 11 is monitored.
Step S16, the data of this running generation are preserved, and correct existing theoretical dirtiness resistance number
Learn model.
In summary it can be seen, the invention discloses a kind of monitoring system of nuclear power station heat exchanger heat exchange property and
Method, monitoring system include the first temperature sensor 1, second temperature sensor 2, three-temperature sensor 3,
4th temperature sensor 4, first flowmeter 5, second flowmeter 6, analog-digital converter 7 and PC 8, PC
The flow rate calculation for temperature and the flowmeter detection that machine 8 detects according to each temperature sensor obtains to be monitored change
The KA values of hot device, are then calculated dirtiness resistance using KA values, by by dirtiness resistance and preset upper limit
Threshold value is compared the monitoring for realizing heat exchanging device heat exchange property.As can be seen that the present invention is using dirt heat
The heat exchange property of resistance substitution KA value heat exchanging devices is evaluated, due to dirt heat is being calculated using KA values
During resistance, the influence of cold fluid and hot fluid suction parameter and physical parameter is eliminated, hence in so that dirty
Dirty thermal resistance can directly reflect Fouling Properties.So KA values evaluation dirt heat exchanging is replaced using dirtiness resistance
The accuracy that the heat exchange property of device influences greatly improves, and then improves the monitoring of heat exchanging device heat exchange property
Reliability.
Those skilled in the art are well known that fluid has stable state and dynamic two states, for fluid
Different conditions need to obtain KA values using different computational methods, therefore, the step S12 in above-described embodiment
Specifically include：
(1) when the fluid of the both sides of heat exchanger 11 to be monitored is in stable state, cold fluid and hot fluid is imported and exported and joined
Number uses heat exchanger LMTD method under limit, and to be monitored when fluid stable is calculated changes
The KA values of hot device 11；
Wherein, logarithmic mean temperature difference (LMTD) refer to two kinds of fluids the Heat-Exchange Process of Heat-Exchanger temperature difference integration it is flat
Average.
(2) when the fluid of the both sides of heat exchanger 11 to be monitored is in dynamic, pre-stored heat exchanger is called
Dynamic Heat Transfer；
Wherein, heat exchanger Dynamic Heat Transfer can be obtained by way of pure mathematics modeling, can also
The mode for being determined by experiment transmission function system obtains.
Input initial value using cold fluid and hot fluid inlet and outlet parameter as the heat exchanger Dynamic Heat Transfer, meter
Calculate the KA values of the heat exchanger to be monitored when obtaining fluid stable.
It should be noted that when dirtiness resistance is not above predetermined upper threshold value, can be according to this meter
Obtained dirtiness resistance and the dirtiness resistance for calculating and storing before, obtain characterizing dirtiness resistance growth
The dirtiness resistance model of trend, can be to the heat-exchange performance of heat exchanger 11 to be monitored according to the dirtiness resistance model
The developing direction of energy is predicted.
Therefore, after the step S16 in above-described embodiment, step can also be included：
Step S17, the dirtiness resistance being calculated according to this and the dirt for calculating and storing before
Thermal resistance, obtain characterizing the dirtiness resistance model of dirtiness resistance growth trend.
Wherein, the data of dirtiness resistance are more, and the accuracy of obtained dirtiness resistance model is higher, treats
The effect for monitoring the developing direction prediction of the heat exchange property of heat exchanger 11 is better.
Those skilled in the art are well known that winter ocean temperature is relatively low, not influence downstream user
Normal work, a part of fluid generally need to be bypassed when seawater passes through heat exchanger, in order to control targe stream
Body outlet temperature.But because exchanger heat appearance is larger, the secondary fluid stream amount regulation of heat exchanger is with stagnant
Property afterwards, therefore cause target fluid outlet temperature to fluctuate widely.
So to ensure that target fluid outlet temperature is stable, referring to Fig. 3, disclosed in another embodiment of the present invention
A kind of control principle drawing of the monitoring system of nuclear power station heat exchanger heat exchange property, in the base of embodiment illustrated in fig. 1
On plinth, in addition to：Feedforward controller 9；
The input of feedforward controller 9 is connected with the output end of PC 8, and feedforward controller 9 is used to receive PC
Machine 8 is according to auxiliary fluid inlet temperature variable quantity and/or the valve for aiding in fluid inlet flow rate variable quantity to obtain
Aperture is adjusted, and according to the valve regulated aperture regulation by-pass line valve, changes the auxiliary fluid
Flow.
Wherein, PC 8 is according to auxiliary fluid inlet temperature variable quantity and/or the inlet flow rate change of auxiliary fluid
The process of the valve regulated aperture measured is specific as follows：
Step S21, when heat exchanger 11 to be monitored is in running status, judge to aid in fluid inlet temperature
Whether preset temperature threshold value is exceeded, or whether auxiliary fluid inlet flow rate exceedes preset flow threshold value, if
It is then to perform step S22, otherwise, terminates Flow-rate adjustment flow；
Wherein, depending on the concrete numerical value of preset temperature threshold value and preset flow threshold value foundation is actually needed, this
Invention does not limit herein.
Step S22, pre-stored heat exchanger Dynamic Heat Transfer is called, and in the auxiliary fluid inlet temperature
When degree exceedes the preset temperature threshold value, auxiliary flow is calculated according to the heat exchanger Dynamic Heat Transfer
Body inlet temperature variable quantity, and when the auxiliary fluid inlet flow rate exceedes the preset flow threshold value,
Auxiliary fluid inlet flow rate variable quantity is calculated according to the heat exchanger Dynamic Heat Transfer；
Wherein, heat exchanger Dynamic Heat Transfer can be obtained by way of pure mathematics modeling, can also
The mode for being determined by experiment transmission function system obtains.
Step S23, according to the auxiliary fluid inlet temperature variable quantity and/or the auxiliary fluid inlet flow
Variable quantity is measured, from pre-stored valve opening adjustment curve, finds corresponding valve regulated aperture；
Step S24, the valve regulated aperture is converted into corresponding electric signal to send to feedforward controller 9,
So that feedforward controller 9 changes the flow for aiding in fluid according to the valve regulated aperture regulation valve.
It in summary it can be seen, the present invention is by PC 8 according to auxiliary fluid inlet temperature variable quantity and/or auxiliary
The valve regulated aperture that fluid inlet changes in flow rate measures, then by feedforward controller 9 to by-pass line
Valve carries out Flow-rate adjustment, realizes the stability contorting to target fluid outlet temperature, makes heat exchanger to be monitored
11 operating mode gradually returns to standard condition.
Also, because the present invention can realize the stability contorting to target fluid outlet temperature, therefore when auxiliary
When helping fluid flow Spline smoothing, the present invention can make target fluid outlet temperature reach steady in a short time
It is fixed, so as to shorten monitoring cycle, realize the fast slowdown monitoring of heat exchanging device heat exchange property.
It should be noted that in monitoring system disclosed in Fig. 1 and Fig. 3, analog-digital converter 7 passes through I/O (inputs
/ output port) 10 it is connected with PC 8.
Finally, it is to be noted that, herein, such as first and second or the like relational terms
It is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires
Either imply between these entities or operation any this actual relation or order be present.Moreover, art
Language " comprising ", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so as to
So that process, method, article or equipment including a series of elements not only include those key elements, and
Also include the other element that is not expressly set out, or also include for this process, method, article or
The intrinsic key element of person's equipment.In the absence of more restrictions, by sentence "including a ..."
The key element of restriction, it is not excluded that also deposited in the process including the key element, method, article or equipment
In other identical element.
Each embodiment is described by the way of progressive in this specification, and each embodiment stresses
The difference with other embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or use
The present invention.A variety of modifications to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.
Claims (7)
- A kind of 1. monitoring system of nuclear power station heat exchanger heat exchange property, it is characterised in that including：The entrance point of the target fluid of heat exchanger to be monitored is arranged on, for detecting target fluid inlet temperature The first temperature sensor；The port of export of the target fluid is arranged on, for detecting the second temperature of target fluid outlet temperature Sensor；The entrance point of the auxiliary fluid of the heat exchanger to be monitored is arranged on, fluid inlet is aided in for detecting The three-temperature sensor of temperature；The port of export of the auxiliary fluid is arranged on, for detecting the 4th temperature of secondary fluid outlet temperature Sensor；The entrance point of the target fluid is arranged on, for detecting the first flow of target fluid inlet flow rate Meter；The entrance point of the auxiliary fluid is arranged on, for detecting the second flow of auxiliary fluid inlet flow rate Meter；Input passes with first temperature sensor, the second temperature sensor, the 3rd temperature respectively The analog-to-digital conversion that sensor, the 4th temperature sensor, the first flowmeter connect with the second flowmeter Device, the analog-digital converter are used for the target fluid inlet temperature of analog signal form, the mesh Mark fluid outlet temperature, the auxiliary fluid inlet temperature, the secondary fluid outlet temperature, the mesh Mark fluid inlet flow and the auxiliary fluid inlet flow rate be converted into corresponding to digital signal form and defeated Go out；The PC that input is connected with the output end of the analog-digital converter, the PC are used to obtain institute State target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid inlet temperature, institute State secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate, profit With the target fluid inlet temperature, the target fluid outlet temperature, it is described auxiliary fluid inlet temperature, The secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate meter Calculation obtains the Composite Walls KA values of the heat exchanger to be monitored, and dirt is calculated according to the KA values The magnitude relationship of thermal resistance, the dirtiness resistance and predetermined upper threshold value, and based on comparative result to institute The heat exchange property for stating heat exchanger to be detected is monitored.
- 2. monitoring system according to claim 1, it is characterised in that the analog-digital converter passes through Input/output end port is connected with the PC.
- 3. monitoring system according to claim 1, it is characterised in that also include：Feedforward controller；The input of the feedforward controller is connected with the output end of the PC, and the feedforward controller is used Changed in receiving the PC according to auxiliary fluid inlet temperature variable quantity and/or auxiliary fluid inlet flow rate The valve regulated aperture measured, and according to the valve regulated aperture regulation by-pass line valve, change The flow of the auxiliary fluid.
- 4. a kind of monitoring method of nuclear power station heat exchanger heat exchange property, it is characterised in that will applied to right The PC in the monitoring system described in 1-3 any one is sought, the monitoring method includes：Obtain target fluid inlet temperature, target fluid outlet temperature, auxiliary fluid inlet temperature, auxiliary Fluid outlet temperature, target fluid inlet flow rate and auxiliary fluid inlet flow rate；Entered according to the target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid Mouth temperature, the secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid enter Mouthful flow, the Composite Walls KA values of the heat exchanger to be monitored when being calculated fluid stable；According to formula (1), dirtiness resistance is calculated by the KA values, the expression formula of formula (1) is：R=KA-1-1/h1-1/h2-δ/λp(1)；In formula, R is the dirtiness resistance, h1For the target fluid side coefficient of heat transfer, h2Changed for auxiliary fluid side Hot coefficient, δ are block board thickness, λpFor dividing plate thermal conductivity factor；Judge whether the dirtiness resistance exceedes predetermined upper threshold value；If it is, output prompt message, the prompt message is used to prompt heat exchange to be monitored described in user The heat exchange property of device is unsatisfactory for demand, and the heat exchanger to be monitored need to be cleaned；If it is not, then preserving the data of this running generation, and correct existing theoretical dirtiness resistance Mathematical modeling.
- 5. monitoring method according to claim 4, it is characterised in that entered according to the target fluid Mouth temperature, the target fluid outlet temperature, the auxiliary fluid inlet temperature, the auxiliary fluid go out Mouth temperature, the target fluid inlet flow rate and the auxiliary fluid inlet flow rate, it is steady to be calculated fluid The Composite Walls KA values of the heat exchanger to be monitored of timing include：When the fluid of the heat exchanger both sides to be monitored is in stable state, to the target fluid inlet temperature, The target fluid outlet temperature, it is described auxiliary fluid inlet temperature, the secondary fluid outlet temperature, The target fluid inlet flow rate and the auxiliary fluid inlet flow rate use heat exchanger logarithm under limit Mean temperature difference method, the KA values of the heat exchanger to be monitored when being calculated fluid stable；When the fluid of the heat exchanger both sides to be monitored is in dynamic, pre-stored heat exchanger dynamic is called Heat transfer model；By the target fluid inlet temperature, the target fluid outlet temperature, the auxiliary fluid inlet Temperature, the secondary fluid outlet temperature, the target fluid inlet flow rate and the auxiliary fluid inlet Input initial value of the flow as the heat exchanger Dynamic Heat Transfer, is calculated institute during fluid stable State the KA values of heat exchanger to be monitored.
- 6. monitoring method according to claim 4, it is characterised in that it is described preserve this ran Cheng Shengcheng data, and after correcting existing theoretical dirtiness resistance mathematical modeling, in addition to：The dirtiness resistance being calculated according to this and the dirtiness resistance for calculating and storing before, are obtained To the dirtiness resistance model for characterizing dirtiness resistance growth trend.
- 7. monitoring method according to claim 4, it is characterised in that before monitoring system also includes When presenting controller, the monitoring method also includes：When the heat exchanger to be monitored is in running status, whether the auxiliary fluid inlet temperature is judged Whether exceed preset flow threshold value more than preset temperature threshold value, or the auxiliary fluid inlet flow rate；If it is, pre-stored heat exchanger Dynamic Heat Transfer is called, and in the auxiliary fluid inlet When temperature exceedes the preset temperature threshold value, auxiliary is calculated according to the heat exchanger Dynamic Heat Transfer Fluid inlet temperature variable quantity, and exceed the preset flow threshold value in the auxiliary fluid inlet flow rate When, auxiliary fluid inlet flow rate variable quantity is calculated according to the heat exchanger Dynamic Heat Transfer；Fluid inlet temperature variable quantity and/or the auxiliary fluid inlet flow rate variable quantity are aided according to described, From pre-stored valve opening adjustment curve, corresponding valve regulated aperture is found；The valve regulated aperture is converted into corresponding electric signal to send to the feedforward controller, so that The feedforward controller changes the flow for aiding in fluid according to the valve regulated aperture regulation valve.
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| CN113707349B (en) * | 2021-09-18 | 2023-06-02 | 福建宁德核电有限公司 | CPR1000 unit main steam pipeline leakage measurement method and device |
| CN117554109A (en) * | 2024-01-11 | 2024-02-13 | 张家港长寿工业设备制造有限公司 | Intelligent monitoring method and system for fault data information of heat exchanger |
| CN117554109B (en) * | 2024-01-11 | 2024-03-26 | 张家港长寿工业设备制造有限公司 | Intelligent monitoring method and system for fault data information of heat exchanger |
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