CN103308336A - Heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring - Google Patents

Abstract

The invention discloses a heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring, belongs to the technical field of the running fault diagnosis of a heat exchanger, and solves the problem that the fault diagnosis accuracy is poor because the heat exchange working medium flow is needed to be monitored in the current heat exchanger fault diagnosis method. The temperature signal output end of a temperature sensor and the pressure signal output end of a pressure sensor are respectively connected with the corresponding signal interfaces of a fault diagnotor which is used for receiving, storing, computing and processing, displaying data and fault diagnosis alarm. According to the method, the rated flow range of a first heat exchange medium of the heat exchanger is divided into N internals; the rated flow range of a second heat exchange medium of the heat exchanger is divided into M internals; temperature and pressure parameters under the condition of the heat exchanger without any fault are computed and processed to be stored as a feature parameter of the heat exchanger in the fault diagnotor; the fault diagnotor carries out processing according to the real-time running data which are transmitted by the temperature sensor and the pressure sensor and computes a specific value of the corresponding data under the condition of no fault so as to judge whether the heat exchanger has a fault or not; and the method is used for the on-line fault diagnosis of the heat exchanger.

Description

A kind of heat interchanger fault diagnosis system and method based on the temperature and pressure signal monitoring

Technical field

The present invention relates to the System and method for of a kind of heat interchanger operation troubles inline diagnosis, the invention belongs to heat interchanger operation troubles diagnostic techniques field, particularly a kind ofly do not measuring the System and method for that carries out the inline diagnosis of heat interchanger operation troubles under the heat-exchange working medium flow condition.

Technical background

Heat interchanger is used very general in commercial production and national life, and its high efficient and reliable operation has vital impact to the economic benefit of these industries.But the faults such as the dirt that heat interchanger exists, obstruction, leakage are ubiquity and problems to be solved in the heat interchanger actual motion.Show according to investigations, the heat interchanger more than 90% all exists dirt, obstruction and leakage problem.Because the existence of these problems causes heat transfer coefficient of heat exchanger to reduce, resistance to flow increases, and shorten equipment life, and then caused a series of economic problems.According to industrially developed country statistics, only with regard to one in heat interchanger dirt, the expense that UK and USA in 1992 is used for dirt accounts for 0.25% of gross national product (GNP), and Britain New Zealand and Australia are 0.1%, and Germany and Japan are 0.25%.This shows, the faults such as the dirt that heat interchanger exists, obstruction, the leakage economic loss that life causes to national product is huge.Exploitation heat interchanger fault diagnosis technology can ensure the operation of heat interchanger high efficient and reliable, energy savings, cost saving better.

The present following problem of heat interchanger fault diagnosis technology ubiquity:

(1) fault diagnosis technology of heat interchanger needs the operating flux of monitoring heat exchanger heat-exchange working medium.This has caused heat interchanger fault diagnosis system cost to increase, and because the flow measurement degree of accuracy is difficult to assurance, causes the confidence level of fault diagnosis and accuracy greatly to descend.

(2) fault diagnosis technology of heat interchanger is based on heat transfer formula and the resistance formula of concrete heat interchanger, lacks universal applicability.Different heat exchanger structure forms, for example plate type heat exchanger and shell and tube exchanger, under the various heat exchange working medium condition, heat transfer coefficient rule and the drag characteristic of heat interchanger differ widely.And the HEAT TRANSFER LAW of heat interchanger and drag characteristic generally derive from experiment or summary of experience, and accuracy is relatively poor, also will cause the confidence level of fault diagnosis and accuracy greatly to descend.Particularly most of heat interchanger can't provide its heat transfer coefficient and drag characteristic formula.

Summary of the invention

The purpose of this invention is to provide a kind of heat interchanger fault diagnosis system and method based on the temperature and pressure signal monitoring, exist needs to measure the heat-exchange working medium flow to solve existing heat interchanger fault diagnosis technology, perhaps rely on heat interchanger heat exchange and drag characteristic experimental formula, cause the problem of fault diagnosis poor accuracy.

The present invention solves the problems of the technologies described above the technical scheme of taking to be:

Technical scheme one: a kind of heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring, described system comprises: extremely far set gradually (by near extremely far away by near on heat transferring medium one inlet pipeline of heat interchanger, take heat interchanger as reference) the first temperature sensor, the first pressure transducer and the second pressure transducer, on heat transferring medium one outlet conduit of heat interchanger by nearly the second temperature sensor to far setting gradually, the 3rd pressure transducer, on heat transferring medium two inlet pipelines of heat interchanger by nearly three-temperature sensor and the 4th pressure transducer to far setting gradually, on heat transferring medium two outlet conduits of heat interchanger by nearly the 4th temperature sensor and the 5th pressure transducer to far setting gradually; The temperature signal output terminal of four temperature sensors and the pressure signal output terminal of five pressure transducers connect one to one with fault diagnosis device corresponding signal interface respectively; The fault diagnosis device is used for data receiver, storage, computing, demonstration and fault diagnosis and reports to the police.Such as Fig. 1.

Technical scheme two: technical scheme one is further limited: the pipeline between the first pressure transducer and the second pressure transducer is provided with the resistance standard component.Such as Fig. 2.

Technical scheme three: technical scheme one is further limited: heat transferring medium two outlet conduits at heat interchanger have been set up the 6th pressure transducer; The 4th temperature sensor, the 5th pressure transducer, the 6th pressure transducer are extremely far set gradually by near.Such as Fig. 3.

Technical scheme four: technical scheme three is further limited: the pipeline between the first pressure transducer and the second pressure transducer is provided with the resistance standard component, and the pipeline between the 5th pressure transducer and the 6th pressure transducer is provided with the resistance standard component.Such as Fig. 4.

Technical scheme five: a kind of heat interchanger method for diagnosing faults that utilizes technical scheme one or two described heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring, the detailed process of described method is:

Step 1, with the rated flow scope V of heat interchanger heat transferring medium one _1dBe divided into N interval, a traffic characteristic value V is all got in each interval in N the interval _1i(1≤i≤N), the rated flow scope V of heat transferring medium two _2dBe divided into M interval, a traffic characteristic value V is all got in each interval in M the interval _2k(1≤k≤M);

The setting of the judgement limit value of step 2, diagnosis ratio parameter: the limit value α that sets ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2max

Step 3, under the heat interchanger fault-free conditions, regulate heat interchanger, realize that heat transferring medium one and heat transferring medium two reach respectively traffic characteristic value and the stable operation in each flow interval, record simultaneously and store the temperature and pressure parameter (logical four temperature sensors of the temperature, pressure parameter here and five pressure transducer acquisitions) under this operating mode, each temperature sensor will record N * M data, the first temperature sensor will record altogether N * M data, and record symbol is t _{3 (i, k)}, represent that the first temperature sensor is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium two is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith;

The first pressure transducer, the 3rd pressure transducer, the second pressure transducer will record N data, and the second pressure transducer will record N data, and record symbol is P _{11 (i)}, represent that the second pressure transducer is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of the first pressure transducer, the 3rd pressure sensor data is identical therewith;

The 5th pressure transducer, the 4th pressure transducer will record M data, and the 5th pressure transducer will record M data, and record symbol is P _{9 (k)}, represent that the 5th pressure transducer is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of the 4th pressure sensor data is identical therewith.

And in the fault diagnosis device, said temperature and pressure parameter carried out computing and store characteristic parameter as heat interchanger; And with the device external differential Δ P of heat transferring medium one _{S1 (i)}, the temperature difference of heat exchanger ratio R _{V (i, k)}Be set as the operating mode identification parameter;

Step 4, heat interchanger are in actual moving process, and the fault diagnosis device carries out computing according to the real-time running data of temperature sensor and pressure transducer transmission; And inquire the related data of corresponding operating mode under the fault-free conditions according to the operating mode identification parameter; And the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions;

Step 5, according to the magnitude relationship of the judgement limit value of the diagnosis ratio parameter of diagnosis ratio parameter and setting, and departure degree judges whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree.

Technical scheme six: technical scheme five is further limited: in step 3, the detailed process of said temperature and pressure parameter being carried out computing in the fault diagnosis device is:

Be V with the flow of heat transferring medium one _1i(1≤i≤N), the flow of heat transferring medium two is V _2k(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger;

The temperature difference of N * M heat transferring medium one: δ t _{1 (ik)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H1 (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two:

Namely getting heat transferring medium one flow is V _1NThe time data calculate;

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device, uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}And R _{V (i, k)}Identification parameter as (i, k) operating mode;

The detailed process of performing step four is:

Monitoring Data and processing when step 4 (), operation: four temperature and five force value after the Real-time Measuring heat interchanger comes into operation, the record symbol that the first temperature sensor is carved the data that monitor at a time is t ₃, the second pressure sensor monitoring to the record symbol of data be P ₁₁, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These nine data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two: ${\mathrm{\ΔP}}_{s2}={\mathrm{\ΔP}}_{s1}{\left(\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2}\right)}^2;$

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then be the R of n value at searching number _{V (n, k)}Find in the data sequence and move temperature difference ratio R _vThe immediate data of size, and record its another searching number, be assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition;

Step 4 (three), calculating fault diagnosis ratio parameter: retrieval is after non-fault operating mode corresponding to actual operating mode, access the characteristic parameter of heat interchanger under this non-fault working condition, and calculate following parameter, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

The detailed process of performing step five is:

If heat interchanger does not have dirt or does not stop up, so α ₁, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If

It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal;

(2) if δ is t _{1 (n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages;

(3) if δ is t _{2 (n, m)}＜δ t ₂, then point out heat transferring medium two to reveal;

(4) if δ is t _{2 (n, m)}＜δ t ₂, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Above data receiver, computing, the operation such as store, call and all will finish in fault diagnosis device (16) inside.

Technical scheme seven: a kind of heat interchanger method for diagnosing faults that utilizes technical scheme three or four described heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring, the detailed process of described method is:

Step 1, with the rated flow scope V of heat interchanger heat transferring medium one _1dBe divided into N interval, a traffic characteristic value V is all got in each interval in N the interval _1i(1≤i≤N), the rated flow scope V of heat transferring medium two _2dBe divided into M interval, a traffic characteristic value V is all got in each interval in M the interval _2k(1≤k≤M);

The setting of the judgement limit value of step 2, diagnosis ratio parameter: the limit value α that sets ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2maxThe limit value α of ratio of heat transfer coefficient II _2min, ratio of heat transfer coefficient I and ratio of heat transfer coefficient II limited field [the Δ α of absolute value of difference _1min, Δ α _2min];

Step 3, under the heat interchanger fault-free conditions, regulate heat interchanger, realize that heat transferring medium one and heat transferring medium two reach respectively traffic characteristic value and the stable operation in each flow interval, record simultaneously and store the temperature and pressure parameter (logical four temperature sensors of the temperature, pressure parameter here and six pressure transducer acquisitions) under this operating mode, each temperature sensor will record N * M data, the first temperature sensor will record altogether N * M data, and record symbol is t _{3 (i, k)}, represent that the first temperature sensor is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium two is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith;

The first pressure transducer, the 3rd pressure transducer, the second pressure transducer will record N data, and the second pressure transducer will record N data, and record symbol is P _{11 (i)}, represent that the second pressure transducer is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of the first pressure transducer, the 3rd pressure sensor data is identical therewith;

The 5th pressure transducer, the 4th pressure transducer, the 6th pressure transducer will record M data, and the 6th pressure transducer will record M data, and record symbol is P _{12 (k)}, represent that the 6th pressure transducer is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of the 5th pressure transducer, the 4th pressure sensor data is identical therewith.

And in the fault diagnosis device, said temperature and pressure parameter carried out computing and store characteristic parameter as heat interchanger; And with the device external differential Δ P of heat transferring medium one _{S1 (i)}, the temperature difference of heat exchanger ratio R _{V (i, k)}Be set as the operating mode identification parameter;

Step 4, heat interchanger are in actual moving process, and the fault diagnosis device carries out computing according to the real-time running data of temperature sensor and pressure transducer transmission; And inquire the related data of corresponding operating mode under the fault-free conditions according to the operating mode identification parameter; And the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions;

Step 5, according to the magnitude relationship of the judgement limit value of the diagnosis ratio parameter of diagnosis ratio parameter and setting, and departure degree judges whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree.

Technical scheme eight: technical scheme seven is further limited:

In step 3, the detailed process of said temperature and pressure parameter being carried out computing in the fault diagnosis device is:

Be V with the flow of heat transferring medium one _1i(1≤i≤N), the flow of heat transferring medium two is V _2k(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger:

The temperature difference of N * M heat transferring medium one: δ t _{1 (ik)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H1 (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two: Δ P _{S2 (k)}=P _{9 (k)}-P _{12 (k)}(1≤k≤M);

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device, uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}And R _{V (i, k)}Identification parameter as (i, k) operating mode;

The detailed process of performing step four is:

Monitoring Data and processing when step 4 (), operation: four temperature and six force value after the Real-time Measuring heat interchanger comes into operation, the record symbol that the first temperature sensor is carved the data that monitor at a time is t ₃, the 6th pressure sensor monitoring to the record symbol of data be P ₁₂, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These 10 data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two: Δ P _S2=P ₉-P ₁₂

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then be the R of n value at searching number _{V (n, k)}Find in the data sequence and move temperature difference ratio R _vThe immediate data of size, and record its another searching number, be assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition;

Step 4 (three), calculating fault diagnosis ratio parameter: retrieval is after non-fault operating mode corresponding to actual operating mode, access the characteristic parameter of heat interchanger under this non-fault working condition, and calculate following parameter, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

The detailed process of performing step five is:

If heat interchanger does not have dirt or does not stop up, so α ₁, α ₂, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Or α ₂Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Under leakage situation, α ₁With α ₂Should equate (perhaps approximately equal), the two degree that differs is larger, illustrates that the possibility of heat interchanger generation leakage is also just larger.Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₂＜α _2min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If

It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal;

(2) if δ is t _{1 (n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages;

(3) if δ is t _{2 (n, m)}＜δ _T2, then point out heat transferring medium two to reveal;

(4) if δ is t _{2 (n, m)}＜δ _T2, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Simultaneously in conjunction with following leak diagnostics logical algorithm:

(1) if Δ α _1min≤ | α ₁-α ₂|＜Δ α _2min, then leakage may occur in diagnosable and prompting heat interchanger;

(2) if α ₁-α ₂〉=Δ α _2min, then diagnosable and prompting heat transferring medium one is revealed to heat transferring medium two;

(3) if α ₂-α ₁〉=Δ α _2min, then diagnosable and prompting heat transferring medium two is revealed to heat transferring medium one;

Above data receiver, computing, the operation such as store, call and all will finish in fault diagnosis device 16 inside.

Technical scheme nine: a kind of heat interchanger method for diagnosing faults that utilizes technical scheme three or four described heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring,

Step 1, with the specified device external differential range delta P of heat interchanger heat transferring medium one _S1dBe divided into N interval, the eigenwert Δ P of a device external differential is got in each interval _{S1 (i)}(1≤i≤N); The specified device external differential range delta P of heat transferring medium two _S2dBe divided into M interval, the eigenwert Δ P of a device external differential is got in each interval _{S2 (k)}(1≤k≤M);

The setting of the judgement limit value of step 2, diagnosis ratio parameter: the limit value α that sets ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2maxThe limit value α of ratio of heat transfer coefficient II _2min, ratio of heat transfer coefficient I and ratio of heat transfer coefficient II limited field [the Δ α of absolute value of difference _1min, Δ α _2min];

Step 3, under the heat interchanger fault-free conditions, regulate heat interchanger, realize that heat transferring medium one and heat transferring medium two reach respectively eigenwert and the stable operation of the device external differential in each device external differential interval, record simultaneously and store the temperature and pressure parameter (logical four temperature sensors of the temperature, pressure parameter here and six pressure transducer acquisitions) under this operating mode, each temperature sensor will record N * M data, temperature sensor 3 will record altogether N * M data, and record symbol is t _{3 (i, k)}, expression temperature sensor 3 is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium 2 is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith;

The first pressure transducer, the 3rd pressure transducer, the second pressure transducer will record N data, and the second pressure transducer will record N data, and record symbol is P _{11 (i)}, represent that the second pressure transducer is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of the first pressure transducer, the 3rd pressure sensor data is identical therewith;

The 5th pressure transducer, the 4th pressure transducer, the 6th pressure transducer will record M data, and the 6th pressure transducer will record M data, and record symbol is P _{12 (k)}, represent that the 6th pressure transducer is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of the 5th pressure transducer, the 4th pressure sensor data is identical therewith.

And in the fault diagnosis device, said temperature and pressure parameter carried out computing and store characteristic parameter as heat interchanger; And with the device external differential Δ P of heat transferring medium one _{S1 (i)}, heat transferring medium two device external differential Δ P _{S2 (k)}Be set as the operating mode identification parameter;

Step 4, heat interchanger are in actual moving process, and the fault diagnosis device carries out computing according to the real-time running data of temperature sensor and pressure transducer transmission; And inquire the related data of corresponding operating mode under the fault-free conditions according to the operating mode identification parameter; And the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions;

Step 5, according to the magnitude relationship of the judgement limit value of the diagnosis ratio parameter of diagnosis ratio parameter and setting, and departure degree judges whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree.

Technical scheme ten: technical scheme nine is further limited:

In step 3, the detailed process of said temperature and pressure parameter being carried out computing in the fault diagnosis device is:

Eigenwert Δ P with the device external differential of heat transferring medium one _{S1 (i)}(1≤i≤N), the eigenwert Δ P of the device external differential of heat transferring medium two _{S2 (k)}(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger:

The temperature difference of N * M heat transferring medium one: δ t _{1 (ik)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $P_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two: Δ P _{S2 (k)}=P _{9 (k)}-P _{12 (k)}(1≤k≤M);

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device, uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}With Δ P _{S2 (k)}Identification parameter as (i, k) operating mode;

The detailed process of performing step four is:

Monitoring Data and processing when step 4 (), operation: four temperature and six force value after the Real-time Measuring heat interchanger comes into operation, the record symbol that the first temperature sensor is carved the data that monitor at a time is t ₃, the 6th pressure sensor monitoring to the record symbol of data be P ₁₂, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These 10 data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two: Δ P _S2=P ₉-P ₁₂

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then at the non-fault device external differential data sequence Δ P of heat transferring medium two _{S2 (k)}In find device external differential data Δ P with actual operating mode _S2Size is near data, and records its searching number, is assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition.

Step 4 (three), calculating fault diagnosis ratio parameter: retrieval is after non-fault operating mode corresponding to actual operating mode, access the characteristic parameter of heat interchanger under this non-fault working condition, and calculate following parameter, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

The detailed process of performing step five is:

If heat interchanger does not have dirt or does not stop up, so α ₁, α ₂, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Or α ₂Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Under leakage situation, α ₁With α ₂Should equate (perhaps approximately equal), the two degree that differs is larger, illustrates that the possibility of heat interchanger generation leakage is also just larger.Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₂＜α _2min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If

It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal.

(2) if δ is t _{1 (n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages.

(3) if δ is t _{2 (n, m)}＜δ t ₂, then point out heat transferring medium two to reveal.

(4) if δ is t _{2 (n, m)}＜δ t ₂, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Simultaneously in conjunction with following leak diagnostics logical algorithm:

(1) if Δ α _1min≤ | α ₁-α ₂|＜Δ α _2min, then leakage may occur in diagnosable and prompting heat interchanger;

(2) if α ₁-α ₂〉=Δ α _2min, then diagnosable and prompting heat transferring medium one is revealed to heat transferring medium two;

(3) if α ₂-α ₁〉=Δ α _2min, then diagnosable and prompting heat transferring medium two is revealed to heat transferring medium one;

Above data receiver, computing, the operation such as store, call and all will finish in fault diagnosis device inside.

The effect that the present invention is useful is:

Of the present invention a kind of based on the temperature and pressure signal the heat interchanger fault diagnosis system and method mainly to be applicable to heat transferring medium all are fluids, and the dividing wall type heat exchanger that has at least a kind of heat transferring medium not undergo phase transition.The present invention is used for the on-line fault diagnosis of heat interchanger.A kind of heat interchanger fault diagnosis system and method based on the temperature and pressure signal monitoring provided by the invention need not to monitor the flow of heat-exchange working medium and do not rely on concrete heat interchanger conduct heat accurately formula and resistance formula, dirt, the obstruction of heat interchanger, the diagnosis of leakage failure be can effectively carry out, efficient, reliability and the economy of heat interchanger operation improved.Concrete advantage shows the following aspects:

(1) the temperature and pressure parameter of a need monitoring heat exchanger, monitoring is simple, and cost is low, and precision is high.

(2) need not the flow of heat transferring medium in the monitoring heat exchanger, monitoring cost is low, and implements when of the present invention for existing heat exchanger system, and the pipeline that need not to cut off original heat exchanger system is installed flowmeter, transforms simple.

(3) need not heat exchange formula and the resistance formula that a large amount of tests and summary provide heat interchanger, do not have the inaccurate fault diagnosis error that causes of formula.

(4) need not to provide the characteristic parameter of heat interchanger, need not the fault diagnosis device inner parameter of the heat interchanger of multi-form, different model is manually arranged, because these inner parameters are heat interchanger when moving under fault-free conditions, fault diagnosis device automatic Identification, calculating and storage, therefore the invention process is simple, and the scope of application of heat interchanger is extensive.

Realize the heat interchanger fault diagnosis system of technical solution of the present invention, comprise the fault diagnosis device with data input, output, storage, computing, demonstration and warning function, heat interchanger, at least 4 temperature sensors, at least 5 pressure transducers, several resistance standard components.A kind of heat interchanger fault diagnosis system structure based on the temperature and pressure signal of the present invention is, heat transferring medium one inlet pipeline at heat interchanger 15 is provided with temperature sensor 3, (the distance needs of wherein being separated by between pressure transducer 7 and the pressure transducer 11 guarantee that the pressure difference between the two is apparent in view for pressure transducer 7 and pressure transducer 11, reach more than 10 times of gauge measurement error), be provided with temperature sensor 4 on the outlet conduit, pressure transducer 8.Heat transferring medium two inlet pipelines at heat interchanger are provided with temperature sensor 6, and pressure transducer 10 is provided with temperature sensor 5 on the outlet conduit, pressure transducer 9.4 temperature sensors are connected with fault diagnosis device 16 respectively with 5 pressure transducers.The real time execution parameter of the heat interchanger that fault diagnosis device 16 provides according to temperature sensor and pressure transducer and the operation troubles diagnosis that diagnostic logic carries out heat interchanger and storage, demonstration, warning etc.

A kind of its diagnostic method of heat interchanger fault diagnosis system based on the temperature and pressure signal of the present invention is, the rated flow scope of heat interchanger heat transferring medium one is divided into N interval, the rated flow scope of heat transferring medium two is divided into M interval, sets the judgement limit value of some diagnosis ratio parameters.At first; guaranteeing under the heat interchanger fault-free conditions; regulate heat interchanger; realize that heat transferring medium one and heat transferring medium two reach respectively traffic characteristic value and the stable operation in each flow interval; record simultaneously and store the temperature and pressure parameter under this operating mode, and in the fault diagnosis device with the characteristic parameter of it computing as heat interchanger.After this, heat interchanger is in actual moving process, the fault diagnosis device is according to the real-time running data of temperature sensor and pressure transducer transmission, carry out computing, and obtain the related data of corresponding operating mode under the fault-free conditions according to operating mode identification parameter inquiry, and the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions; According to the magnitude relationship of the judgement limit value of the ratio parameter of diagnosis ratio parameter and setting, and departure degree, judge whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree, the reactions such as demonstration, warning made at last.

Description of drawings

Fig. 1 is the heat interchanger fault diagnosis system structural drawing of the specific embodiment of the invention one; Fig. 2 is the heat interchanger fault diagnosis system structural drawing of embodiment two; Fig. 3 is the heat interchanger fault diagnosis system structural drawing of embodiment three; Fig. 4 is the heat interchanger fault diagnosis system structural drawing of embodiment four.

Embodiment

Embodiment one: present embodiment is described in conjunction with Fig. 1, the described a kind of heat interchanger fault diagnosis system structure based on the temperature and pressure signal monitoring of present embodiment is, heat transferring medium one inlet pipeline at heat interchanger 15 is provided with temperature sensor 3, (the distance needs of wherein being separated by between pressure transducer 7 and the pressure transducer 11 guarantee that the pressure difference between the two is apparent in view for pressure transducer 7 and pressure transducer 11, reach more than 10 times of gauge measurement error), be provided with temperature sensor 4 on the outlet conduit, pressure transducer 8.Heat transferring medium two inlet pipelines at heat interchanger are provided with temperature sensor 6, and pressure transducer 10 is provided with temperature sensor 5 on the outlet conduit, pressure transducer 9.4 temperature sensors are connected with fault diagnosis device 16 respectively with 5 pressure transducers.The real time execution parameter of the heat interchanger that fault diagnosis device 16 provides according to temperature sensor and pressure transducer and the operation troubles diagnosis that diagnostic logic carries out heat interchanger and storage, demonstration, warning etc.

A kind of its diagnostic method of heat interchanger fault diagnosis system based on the temperature and pressure signal of the present invention is, the rated flow scope of heat interchanger heat transferring medium one is divided into N interval, the rated flow scope of heat transferring medium two is divided into M interval, sets the judgement limit value of some diagnosis ratio parameters.At first; guaranteeing under the heat interchanger fault-free conditions; regulate heat interchanger; realize that heat transferring medium one and heat transferring medium two reach respectively traffic characteristic value and the stable operation in each flow interval; record simultaneously and store the temperature and pressure parameter under this operating mode, and in the fault diagnosis device with the characteristic parameter of it computing as heat interchanger.After this, heat interchanger is in actual moving process, the fault diagnosis device is according to the real-time running data of temperature sensor and pressure transducer transmission, carry out computing, and obtain the related data of corresponding operating mode under the fault-free conditions according to operating mode identification parameter inquiry, and the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions; According to the magnitude relationship of the judgement limit value of the ratio parameter of diagnosis ratio parameter and setting, and departure degree, judge whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree, the reactions such as demonstration, warning made at last.

The course of work and the logic of the fault diagnosis of present embodiment are as follows:

(1) with the flow range V of heat interchanger heat transferring medium one _1d, being divided into N interval, a traffic characteristic value V is got in each interval _1i(1≤i≤N).The flow range V of heat transferring medium two _2d, being divided into M interval, a traffic characteristic value V is got in each interval _2k(1≤k≤M).Set the limit value α of ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2max

(2) failure-free data monitoring stores: under guaranteeing the trouble-free situation of heat interchanger (when for example heat interchanger drops into normal use for the first time; after perhaps certain cleans maintenance); the flow of heat transferring medium one and heat transferring medium two in the adjusting change heat interchanger; make it to reach successively the traffic characteristic value in each flow interval; record also stores under the various flow rate working conditions 4 temperature and 5 pressure of the import and export of heat interchanger.Each temperature sensor will record N * M data, and for example temperature sensor 3 will record altogether N * M data, and record symbol is t _{3 (i, k)}, expression temperature sensor 3 is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium 2 is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith; Pressure transducer 7, pressure transducer 8, pressure transducer 11 will record N data, and for example pressure transducer 11 will record N data, and record symbol is P _{11 (i)}, expression pressure transducer 11 is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of pressure transducer 7, pressure transducer 8 data is identical therewith; Pressure transducer 9, pressure transducer 10 will record M data, and for example pressure transducer 9 will record M data, and record symbol is P _{9 (k)}, expression pressure transducer 9 is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of pressure transducer 10 data is identical therewith.

(3) failure-free data is processed: be V with the flow of heat transferring medium one _1i(1≤i≤N), the flow of heat transferring medium two is V _2k(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger:

The temperature difference of N * M heat transferring medium one: δ t _{1 (ik)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H1 (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two:

Namely getting heat transferring medium one flow is V _1NThe time data calculate;

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device 16, uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}And R _{V (i, k)}Identification parameter as (i, k) operating mode.

(4) when operation Monitoring Data and processing: 4 temperature and 5 force value after the Real-time Measuring heat interchanger comes into operation, for example to carve at a time the record symbol of the data that monitor be t to the first temperature sensor 3 ₃, the record symbol of the data that the second pressure transducer 11 monitors is P ₁₁, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These 9 data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two: ${\mathrm{\ΔP}}_{s2}={\mathrm{\ΔP}}_{s1}{\left(\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2}\right)}^2;$

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

(5) inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then be the R of n value at searching number _{V (n, k)}Find in the data sequence and move temperature difference ratio R _vThe immediate data of size, and record its another searching number, be assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition;

(6) calculate the fault diagnosis ratio parameter: retrieval accesses the characteristic parameter of heat interchanger under this non-fault working condition, and calculates following parameter after non-fault operating mode corresponding to actual operating mode, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

(7) carrying out fault diagnosis and degree judges: if heat interchanger does not have dirt or do not have obstruction, so α ₁, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If

It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal;

(2) if δ is t _{1 (n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages;

(3) if δ is t _{2 (n, m)}＜δ t ₂, then point out heat transferring medium two to reveal;

(4) if δ is t _{2 (n, m)}＜δ t ₂, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Above data receiver, computing, the operation such as store, call and all will finish in fault diagnosis device 16 inside.

Embodiment two: in conjunction with Fig. 2 present embodiment is described, the difference of present embodiment and embodiment one is to be provided with a resistance standard component 13 between pressure transducer 11 and pressure transducer 7.Apparent in view in order to guarantee the pressure reduction between pressure transducer 11 and the pressure transducer 7 in embodiment one, usually require distant between two pressure transducers, this relatively is difficult to realize in some actual conditions, and the data sensor line is also longer, and this is disadvantageous.Arrange after the resistance standard component 13, it is nearer that two pressure transducers just can arrange, and data line is also shorter.Other is identical with embodiment one.

Embodiment three: in conjunction with Fig. 3 present embodiment is described, the difference of present embodiment and embodiment one is the outlet at heat transferring medium two, and the downstream of pressure transducer 9 is provided with pressure transducer 12.Simultaneously:

1, revising the device external differential formula that calculates heat transferring medium two under the non-fault operating mode is:

ΔP _s2(k)＝P _9(k)-P _12(k)(1≤k≤M)

2, revising the device external differential formula that calculates the heat transferring medium two under the actual operating mode is:

ΔP _s2＝P ₉-P ₁₂

3, also revise selected Δ P _{S1 (i)}With Δ P _{S2 (k)}Identification parameter as (i, k) operating mode.Namely when carrying out the inquiry of non-fault operating mode corresponding to actual operating mode, at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then be the R of n value at searching number _{V (n, k)}Find in the data sequence and move temperature difference ratio R _vThe immediate data of size, and record its another searching number, be assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition.

4, increase the limit value α that sets ratio of heat transfer coefficient II _2min

Increase dirt or plugging fault diagnostic logic algorithm as follows:

If

Then point out dirt or stop up slight.

If

Then point out dirt or stop up medium.

If

Then point out dirt or stop up serious.

If α ₂＜α _2min, then prompting is reported to the police, and dirt or obstruction can't be born.

5, increase limited field [the Δ α of the absolute value of the difference of setting ratio of heat transfer coefficient I and ratio of heat transfer coefficient II _1min, Δ α _2min]; Generally speaking, under leakage situation, α ₁With α ₂Should equate (perhaps approximately equal), the two degree that differs is larger, illustrates that the possibility of heat interchanger generation leakage is also just larger.A kind of leak diagnostics logical algorithm that replenishes is as follows:

(1) if Δ α _1min≤ | α ₁-α ₂|＜Δ α _2min, then leakage may occur in diagnosable and prompting heat interchanger;

(2) if α ₁-α ₂〉=Δ α _2min, then diagnosable and prompting heat transferring medium one is revealed to heat transferring medium two;

(3) if α ₂-α ₁〉=Δ α _2min, then diagnosable and prompting heat transferring medium two is revealed to heat transferring medium one;

Above data receiver, computing, the operation such as store, call and all will finish in fault diagnosis device 16 inside.

The monitoring of other parameter, calculating, judgement are identical with embodiment one.

Embodiment four: such as Fig. 4, the difference of present embodiment and embodiment three is, between pressure transducer 11 and pressure transducer 7, be provided with pressure criteria spare 13, between pressure transducer 12 and pressure transducer 9, be provided with pressure criteria spare 14.Arrange after resistance standard component 13 and 14, pressure transducer 11 and 7, it is nearer that pressure transducer 12 and 9 just can arrange, and data line is also shorter, easy to implement and wiring.Other is identical with embodiment three.

Embodiment five: present embodiment and embodiment three, four difference are, with the specified device external differential range delta P of heat interchanger heat transferring medium one _S1dBe divided into N interval, the eigenwert Δ P of a device external differential is got in each interval _{S1 (i)}(1≤i≤N); The specified device external differential range delta P of heat transferring medium two _S2dBe divided into M interval, the eigenwert Δ P of a device external differential is got in each interval _{S2 (k)}(1≤k≤M).Division, adjusting that present embodiment is convenient to the non-fault operating mode realize and data monitoring.Other and embodiment three, four identical.

Claims (10)

1. heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring, it is characterized in that: described system comprises: on heat transferring medium one inlet pipeline of heat interchanger (15) by nearly the first temperature sensor (3) to far setting gradually, the first pressure transducer (7) and the second pressure transducer (11), on heat transferring medium one outlet conduit of heat interchanger (15) by nearly the second temperature sensor (4) to far setting gradually, the 3rd pressure transducer (8), on heat transferring medium two inlet pipelines of heat interchanger (15) by nearly three-temperature sensor (6) and the 4th pressure transducer (10) to far setting gradually, on heat transferring medium two outlet conduits of heat interchanger (15) by the 4th temperature sensor (5) and the 5th pressure transducer (9) that closely extremely far set gradually; The temperature signal output terminal of four temperature sensors and the pressure signal output terminal of five pressure transducers connect one to one with fault diagnosis device (16) corresponding signal interface respectively; Fault diagnosis device (16) is used for data receiver, storage, computing, demonstration and fault diagnosis and reports to the police.

2. a kind of heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring according to claim 1, it is characterized in that: the pipeline between the first pressure transducer (7) and the second pressure transducer (11) is provided with resistance standard component (13).

3. a kind of heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring according to claim 1, it is characterized in that: heat transferring medium two outlet conduits at heat interchanger (15) have been set up the 6th pressure transducer (12); The 4th temperature sensor (5), the 5th pressure transducer (9), the 6th pressure transducer (12) are extremely far set gradually by near.

4. according to claim 3 described a kind of heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring, it is characterized in that: the pipeline between the first pressure transducer (7) and the second pressure transducer (11) is provided with resistance standard component (13), and the pipeline between the 5th pressure transducer (9) and the 6th pressure transducer (12) is provided with resistance standard component (14).

5. heat interchanger method for diagnosing faults that utilizes claim 1 or 2 described heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring, it is characterized in that: the detailed process of described method is:

Step 1, with the rated flow scope V of heat interchanger heat transferring medium one _1dBe divided into N interval, a traffic characteristic value V is all got in each interval in N the interval _1i(1≤i≤N), the rated flow scope V of heat transferring medium two _2dBe divided into M interval, a traffic characteristic value V is all got in each interval in M the interval _2k(1≤k≤M);

The setting of the judgement limit value of step 2, diagnosis ratio parameter: the limit value α that sets ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2max

Step 3, under the heat interchanger fault-free conditions, regulate heat interchanger, realize that heat transferring medium one and heat transferring medium two reach respectively traffic characteristic value and the stable operation in each flow interval, record simultaneously and store the temperature and pressure parameter under this operating mode, each temperature sensor will record N * M data, the first temperature sensor (3) will record altogether N * M data, and record symbol is t _{3 (i, k)}, represent that the first temperature sensor (3) is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium two is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith;

The first pressure transducer (7), the 3rd pressure transducer (8), the second pressure transducer (11) will record N data, and the second pressure transducer (11) will record N data, and record symbol is P _{11 (i)}, represent that the second pressure transducer (11) is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of the first pressure transducer (7), the 3rd pressure transducer (8) data is identical therewith;

The 5th pressure transducer (9), the 4th pressure transducer (10) will record M data, and the 5th pressure transducer (9) will record M data, and record symbol is P _{9 (k)}, represent that the 5th pressure transducer (9) is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of the 4th pressure transducer (10) data is identical therewith.

And in the fault diagnosis device, said temperature and pressure parameter carried out computing and store characteristic parameter as heat interchanger; And with the device external differential Δ P of heat transferring medium one _{S1 (i)}, the temperature difference of heat exchanger ratio R _{V (i, k)}Be set as the operating mode identification parameter;

Step 4, heat interchanger are in actual moving process, and the fault diagnosis device carries out computing according to the real-time running data of temperature sensor and pressure transducer transmission; And inquire the related data of corresponding operating mode under the fault-free conditions according to the operating mode identification parameter; And the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions;

Step 5, according to the magnitude relationship of the judgement limit value of the diagnosis ratio parameter of diagnosis ratio parameter and setting, and departure degree judges whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree.

6. the heat interchanger method for diagnosing faults of the heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring according to claim 5 is characterized in that:

In step 3, the detailed process of said temperature and pressure parameter being carried out computing in the fault diagnosis device is:

Be V with the flow of heat transferring medium one _1i(1≤i≤N), the flow of heat transferring medium two is V _2k(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger;

The temperature difference of N * M heat transferring medium one: δ t _{1 (i, k)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $P_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H1 (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two:

Namely getting heat transferring medium one flow is V _1NThe time data calculate;

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device (16), uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}And R _{V (i, k)}Identification parameter as (i, k) operating mode;

The detailed process of performing step four is:

Monitoring Data and processing when step 4 (), operation: four temperature and five force value after the Real-time Measuring heat interchanger comes into operation, the record symbol that the first temperature sensor (3) is carved the data that monitor at a time is t ₃, the record symbol of the data that the second pressure transducer (11) monitors is P ₁₁, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These nine data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two:

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then be the R of n value at searching number _{V (n, k)}Find in the data sequence and move temperature difference ratio R _vThe immediate data of size, and record its another searching number, be assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition;

Step 4 (three), calculating fault diagnosis ratio parameter: retrieval is after non-fault operating mode corresponding to actual operating mode, access the characteristic parameter of heat interchanger under this non-fault working condition, and calculate following parameter, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

The detailed process of performing step five is:

If heat interchanger does not have dirt or does not stop up, so α ₁, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If

It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal;

(2) if δ is t _{1 (n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages;

(3) if δ is t _{2 (n, m)}＜δ t ₂, then point out heat transferring medium two to reveal;

(4) if δ is t _{2 (n, m)}＜δ t ₂, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Above data receiver, computing, storage, call operation all will be finished in fault diagnosis device (16) inside.

7. heat interchanger method for diagnosing faults that utilizes claim 3 or 4 described heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring, it is characterized in that: the detailed process of described method is:

Step 1, with the rated flow scope V of heat interchanger heat transferring medium one _1dBe divided into N interval, a traffic characteristic value V is all got in each interval in N the interval _1i(1≤i≤N), the rated flow scope V of heat transferring medium two _2dBe divided into M interval, a traffic characteristic value V is all got in each interval in M the interval _2k(1≤k≤M);

The setting of the judgement limit value of step 2, diagnosis ratio parameter: the limit value α that sets ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2maxThe limit value α of ratio of heat transfer coefficient II _2min, ratio of heat transfer coefficient I and ratio of heat transfer coefficient II limited field [the Δ α of absolute value of difference _1min, Δ α _2min];

Step 3, under the heat interchanger fault-free conditions, regulate heat interchanger, realize that heat transferring medium one and heat transferring medium two reach respectively traffic characteristic value and the stable operation in each flow interval, record simultaneously and store the temperature and pressure parameter under this operating mode, each temperature sensor will record N * M data, the first temperature sensor (3) will record altogether N * M data, and record symbol is t _{3 (i, k)}, represent that the first temperature sensor (3) is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium two is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith;

The first pressure transducer (7), the 3rd pressure transducer (8), the second pressure transducer (11) will record N data, and the second pressure transducer (11) will record N data, and record symbol is P _{11 (i)}, represent that the second pressure transducer (11) is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of the first pressure transducer (7), the 3rd pressure transducer (8) data is identical therewith;

The 5th pressure transducer (9), the 4th pressure transducer (10), the 6th pressure transducer (12) will record M data, and the 6th pressure transducer (12) will record M data, and record symbol is P _{12 (k)}, represent that the 6th pressure transducer (12) is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of the 5th pressure transducer (9), the 4th pressure transducer (10) data is identical therewith;

And in the fault diagnosis device, said temperature and pressure parameter carried out computing and store characteristic parameter as heat interchanger; And with the device external differential Δ P of heat transferring medium one _{S1 (i)}, the temperature difference of heat exchanger ratio R _{V (i, k)}Be set as the operating mode identification parameter;

Step 4, heat interchanger are in actual moving process, and the fault diagnosis device carries out computing according to the real-time running data of temperature sensor and pressure transducer transmission; And inquire the related data of corresponding operating mode under the fault-free conditions according to the operating mode identification parameter; And the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions;

Step 5, according to the magnitude relationship of the judgement limit value of the diagnosis ratio parameter of diagnosis ratio parameter and setting, and departure degree judges whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree.

8. the heat interchanger method for diagnosing faults of the heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring according to claim 7 is characterized in that:

In step 3, the detailed process of said temperature and pressure parameter being carried out computing in the fault diagnosis device is:

Be V with the flow of heat transferring medium one _1i(1≤i≤N), the flow of heat transferring medium two is V _2k(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger:

The temperature difference of N * M heat transferring medium one: δ t _{1 (i, k)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $P_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H1 (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two: Δ P _{S2 (k)}=P _{9 (k)}-P _{12 (k)}(1≤k≤M);

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device (16), uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}And R _{V (i, k)}Identification parameter as (i, k) operating mode;

The detailed process of performing step four is:

Monitoring Data and processing when step 4 (), operation: four temperature and six force value after the Real-time Measuring heat interchanger comes into operation, the record symbol that the first temperature sensor (3) is carved the data that monitor at a time is t ₃, the record symbol of the data that the 6th pressure transducer (12) monitors is P ₁₂, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These 10 data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two: Δ P _S2=P ₉-P ₁₂

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then be the R of n value at searching number _{V (n, k)}Find in the data sequence and move temperature difference ratio R _vThe immediate data of size, and record its another searching number, be assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition;

Step 4 (three), calculating fault diagnosis ratio parameter: retrieval is after non-fault operating mode corresponding to actual operating mode, access the characteristic parameter of heat interchanger under this non-fault working condition, and calculate following parameter, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

The detailed process of performing step five is:

If heat interchanger does not have dirt or does not stop up, so α ₁, α ₂, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Or α ₂Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Under leakage situation, α ₁With α ₂Should equate or approximately equal, the two degree that differs is larger, illustrates that the possibility of heat interchanger generation leakage is also just larger; Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₂＜α _2min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal;

(2) if δ is t1 _{(n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages;

(3) if δ is t _{2 (n, m)}＜δ t ₂, then point out heat transferring medium two to reveal;

(4) if δ is t _{2 (n, m)}＜δ t ₂, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Simultaneously in conjunction with following leak diagnostics logical algorithm:

(1) if Δ α _1min≤ | α ₁-α ₂|＜Δ α _2min, then leakage may occur in diagnosable and prompting heat interchanger;

(2) if α ₁-α ₂〉=Δ α _2min, then diagnosable and prompting heat transferring medium one is revealed to heat transferring medium two;

(3) if α ₂-α ₁〉=Δ α _2min, then diagnosable and prompting heat transferring medium two is revealed to heat transferring medium one;

Above data receiver, computing, storage, call operation all will be finished in fault diagnosis device 16 inside.

9. heat interchanger method for diagnosing faults that utilizes claim 3 or 4 described heat interchanger fault diagnosis systems based on the temperature and pressure signal monitoring is characterized in that:

Step 1, with the specified device external differential range delta P of heat interchanger heat transferring medium one _S1dBe divided into N interval, the eigenwert Δ P of a device external differential is got in each interval _{S1 (i)}(1≤i≤N); The specified device external differential range delta P of heat transferring medium two _S2dBe divided into M interval, the eigenwert Δ P of a device external differential is got in each interval _{S2 (k)}(1≤k≤M);

The setting of the judgement limit value of step 2, diagnosis ratio parameter: the limit value α that sets ratio of heat transfer coefficient I _1min, the impedance ratio limit value β of heat transferring medium one _1max, the impedance ratio limit value β of heat transferring medium two _2maxThe limit value α of ratio of heat transfer coefficient II _2min, ratio of heat transfer coefficient I and ratio of heat transfer coefficient II limited field [the Δ α of absolute value of difference _1min, Δ α _2min];

Step 3, under the heat interchanger fault-free conditions, regulate heat interchanger, realize that heat transferring medium one and heat transferring medium two reach respectively eigenwert and the stable operation of the device external differential in each device external differential interval, record simultaneously and store the temperature and pressure parameter under this operating mode, each temperature sensor will record N * M data, temperature sensor 3 will record altogether N * M data, and record symbol is t _{3 (i, k)}, expression temperature sensor 3 is V at the flow of heat transferring medium one _1i, the flow of heat transferring medium 2 is V _2kTemperature value under the condition, the record symbol regulation of other temperature sensor data is identical therewith;

The first pressure transducer (7), the 3rd pressure transducer (8), the second pressure transducer (11) will record N data, and the second pressure transducer (11) will record N data, and record symbol is P _{11 (i)}, represent that the second pressure transducer (11) is V at the flow of heat transferring medium one _1iForce value under the condition, the record symbol regulation of the first pressure transducer (7), the 3rd pressure transducer (8) data is identical therewith;

The 5th pressure transducer (9), the 4th pressure transducer (10), the 6th pressure transducer (12) will record M data, and the 6th pressure transducer (12) will record M data, and record symbol is P _{12 (k)}, represent that the 6th pressure transducer (12) is V at the flow of heat transferring medium two _2kForce value under the condition, the record symbol regulation of the 5th pressure transducer (9), the 4th pressure transducer (10) data is identical therewith;

And in the fault diagnosis device, said temperature and pressure parameter carried out computing and store characteristic parameter as heat interchanger; And with the device external differential Δ P of heat transferring medium one _{S1 (i)}, heat transferring medium two device external differential Δ P _{S2 (k)}Be set as the operating mode identification parameter;

Step 4, heat interchanger are in actual moving process, and the fault diagnosis device carries out computing according to the real-time running data of temperature sensor and pressure transducer transmission; And inquire the related data of corresponding operating mode under the fault-free conditions according to the operating mode identification parameter; And the characteristic parameter of corresponding heat interchanger carries out ratio calculation and obtains diagnosing ratio parameter under the data that computing in the actual moving process is obtained and the fault-free conditions;

Step 5, according to the magnitude relationship of the judgement limit value of the diagnosis ratio parameter of diagnosis ratio parameter and setting, and departure degree judges whether heat interchanger the faults such as dirt, obstruction, leakage occur, and fault degree.

10. the heat interchanger method for diagnosing faults of the heat interchanger fault diagnosis system based on the temperature and pressure signal monitoring according to claim 9 is characterized in that:

In step 3, the detailed process of said temperature and pressure parameter being carried out computing in the fault diagnosis device is:

Eigenwert Δ P with the device external differential of heat transferring medium one _{S1 (i)}(1≤i≤N), the eigenwert Δ P of the device external differential of heat transferring medium two _{S2 (k)}(operating mode of 1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and is stored as the characteristic parameter of heat interchanger:

The temperature difference of N * M heat transferring medium one: δ t _{1 (i, k)}=| t _{3 (i, k)}-t _{4 (i, k)}| (1≤i≤N, 1≤k≤M);

The temperature difference of N * M heat transferring medium two: δ t _{2 (i, k)}=| t _{5 (i, k)}-t _{6 (i, k)}| (1≤i≤N, 1≤k≤M);

N * M mean temperature difference: ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N * M temperature difference ratio: $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N heat transferring medium one: Δ P _{S1 (i)}=P _{11 (i)}-P _{7 (i)}(1≤i≤N);

Pressure reduction in the device of N heat transferring medium one: Δ P _{H1 (i)}=P _{7 (i)}-P _{8 (i)}(1≤i≤N);

Pressure reduction in the device of M heat transferring medium two: Δ P _{H2 (k)}=P _{6 (k)}-P _{5 (k)}(1≤k≤M);

The device external differential of M heat transferring medium two: Δ P _{S2 (k)}=P _{9 (k)}-P _{12 (k)}(1≤k≤M);

N * M intermediate parameters: $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N * M intermediate parameters: $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N intermediate parameters: $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters: $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in the fault diagnosis device (16), uses in follow-up diagnosis as the characteristic constant of this heat interchanger, and selected Δ P _{S1 (i)}With Δ P _{S2 (k)}Identification parameter as (i, k) operating mode;

The detailed process of performing step four is:

Monitoring Data and processing when step 4 (), operation: four temperature and six force value after the Real-time Measuring heat interchanger comes into operation, the record symbol that the first temperature sensor (3) is carved the data that monitor at a time is t ₃, the record symbol of the data that the 6th pressure transducer (12) monitors is P ₁₂, the record symbol regulation of other temperature sensor and pressure transducer is identical therewith; These 10 data that at every turn monitor are carried out following computing:

The temperature difference of heat transferring medium one: δ t ₁=| t ₃-t ₄|;

The temperature difference of heat transferring medium two: δ t ₂=| t ₅-t ₆|;

Mean temperature difference: ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio: $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one: Δ P _S1=P ₁₁-P ₇

Pressure reduction in the device of heat transferring medium one: Δ P _H1=P ₇-P ₈

Pressure reduction in the device of heat transferring medium two: Δ P _H2=P ₆-P ₅

The device external differential of heat transferring medium two: Δ P _S2=P ₉-P ₁₂

Intermediate parameters: $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about non-fault operating mode corresponding to this operating condition: at first at the non-fault device external differential data sequence Δ P of heat transferring medium one _{S1 (i)}In find device external differential data Δ P with actual operating mode _S1Size is near data, and records its searching number, is assumed to be n; Then at the non-fault device external differential data sequence Δ P of heat transferring medium two _{S2 (k)}In find device external differential data Δ P with actual operating mode _S2Size is near data, and records its searching number, is assumed to be m; So found the non-fault operating mode (n, m) corresponding with this operating condition;

Step 4 (three), calculating fault diagnosis ratio parameter: retrieval is after non-fault operating mode corresponding to actual operating mode, access the characteristic parameter of heat interchanger under this non-fault working condition, and calculate following parameter, will be for the diagnosis of fault category and degree:

Ratio of heat transfer coefficient I:

Ratio of heat transfer coefficient II:

Heat transferring medium one impedance ratio:

Heat transferring medium two impedance ratios:

The detailed process of performing step five is:

If heat interchanger does not have dirt or does not stop up, so α ₁, α ₂, β ₁, β ₂All should equal 1 or very near 1; Heat interchanger has had after dirt or the obstruction, α ₁Or α ₂Will be less than 1, and depart from 1 far, dirt is described or stops up more serious; β ₁And β ₂Will be greater than 1, and depart from 1 far, dirt is described or stops up more serious; Under leakage situation, α ₁With α ₂Should equate or approximately equal, the two degree that differs is larger, illustrates that the possibility of heat interchanger generation leakage is also just larger.Can carry out the diagnosis of dirt and plugging fault according to this principle, and the judgement of fault degree, concrete diagnostic procedure is as follows:

If

It is slight then pointing out dirt or stopping up;

If

It is medium then pointing out dirt or stopping up;

If

It is serious then pointing out dirt or stopping up;

If α ₁＜α _1min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out dirt or stopping up;

If It is medium then pointing out dirt or stopping up;

If It is serious then pointing out dirt or stopping up;

If α ₂＜α _2min, then prompting is reported to the police, and dirt or obstruction can't be born;

Simultaneously in conjunction with the logical algorithm of following dirt or clogging diagnoses:

If

It is slight then pointing out the dirt of heat transferring medium one side or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium one side or stopping up;

If It is serious then pointing out the dirt of heat transferring medium one side or stopping up;

If β ₁＞β _1max, then prompting is reported to the police, and the dirt of heat transferring medium one side or obstruction can't be born;

In like manner:

If

It is slight then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is medium then pointing out the dirt of heat transferring medium two sides or stopping up;

If

It is serious then pointing out the dirt of heat transferring medium two sides or stopping up;

If β ₂＞β _2max, then prompting is reported to the police, and the dirt of heat transferring medium two sides or obstruction can't be born;

About revealing fault diagnosis, can take following logical algorithm:

(1) if δ is t _{1 (n, m)}＜δ t ₁, then point out heat transferring medium one to reveal.

(2) if δ is t _{1 (n, m)}＜δ t ₁, and β ₁＜1, then point out heat transferring medium one to heat transferring medium two leakages.

(3) if δ is t _{2 (n, m)}＜δ t ₂, then point out heat transferring medium two to reveal.

(4) if δ is t _{2 (n, m)}＜δ t ₂, and β ₂＜1, then point out heat transferring medium two to heat transferring medium one leakage;

Simultaneously in conjunction with following leak diagnostics logical algorithm:

(1) if Δ α _1min≤ | α ₁-α ₂|＜Δ α _2min, then leakage may occur in diagnosable and prompting heat interchanger;

(2) if α ₁-α ₂〉=Δ α _2min, then diagnosable and prompting heat transferring medium one is revealed to heat transferring medium two;

(3) if α ₂-α ₁〉=Δ α _2min, then diagnosable and prompting heat transferring medium two is revealed to heat transferring medium one;

Above data receiver, computing, storage, call operation all will be finished in fault diagnosis device (16) inside.

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