CN103557992A - Method for detecting inner leakage of steam hydrophobic valve based on valve front pipe wall temperature detection - Google Patents
Method for detecting inner leakage of steam hydrophobic valve based on valve front pipe wall temperature detection Download PDFInfo
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Abstract
The invention discloses a method for detecting inner leakage of a steam hydrophobic valve based on valve front pipe wall temperature detection. The method includes the following steps that a first representative point and a second representative point are selected at the positions where the front end specified distance and the interval specified distance of the steam hydrophobic valve are detected respectively, modeling is conducted on the theoretical pipe wall temperature of the first representative point and the theoretical pipe wall temperature of the second representative point through a statistical regression model, pipe wall temperatures corresponding to the representative points are actually measured, then, according to a hypothesis iterative algorithm, the leakage rate corresponding to the first representative point, the leakage rate corresponding to the second representative point and the leakage rate corresponding to the temperature difference of the two representative points are acquired, and one of the three leakage rates acquired by calculation is selected as the final leakage rate of inner leakage of the steam hydrophobic valve to be detected and then output. Qualitative and quantitative detection or online monitoring of inner leakage of the valve can be achieved, and the method has the advantages of being high in inner leakage detection accuracy and detection speed and wide in application range.
Description
Technical field
The present invention relates to undetected survey technology in Automatic steam trap Trap, be specifically related to leak detection method in a kind of Automatic steam trap Trap detecting based on pipe surface temperature before valve.
Background technology
A large amount of Automatic steam trap Traps that use in steam heating engineering, steam power plant, due to operating condition inclement condition, valve opening and closing operation is day by day frequent, and the factor that causes valve to break down is many, and valve " run, drip, leak " phenomenon happens occasionally.Once steam drainage valve leaks, not only can cause equipment performance to decline, cause energy loss and economic loss, and can cause at short notice valve to damage, the safety of equipment is constituted a serious threat.At present, administering valve leak is the Important Action that steam heating power engineering corporation is energy-saving and cost-reducing, improve equipment safety in operation and stability.
The leakage of valve can be divided into and leaking outside and interior leakage.Compare with leaking outside, valves leakage is more difficult discovery generally, easily causes the serious accident of burst.At present, conventional valves leakage detection method mainly comprises infrared thermometry method, ultrasonic Detection Method, negative pressure wave method etc., but these methods all have it to use limitation.At present, apply that to leak diagnostic method in more steam drainage valve be temperature diagnosis in engineering field, its ultimate principle is the temperature changing regularity in operational process according to valve body and the pipeline that is connected with valve thereof, judges whether valve occurs leakage.Steam drainage valve leak diagnostics can utilize the valve leak real time data that valve on-line monitoring is obtained on the one hand, quantitative Diagnosis leakiness, and prediction development trend, and take effectively maintenance and control measure, reduce maintenance cost and energy loss; Can effectively prevent that on the other hand consequence that valve leak fault causes from, to the expansion of neighbouring device, improving security and economy that enterprise produces.But, difference due to working conditions such as medium running parameter, thermofin performance, valve and piping system structures, make to adopt the method judgement valve leak to become a very complicated technical matters, judging disconnected situation by accident occurs repeatedly, caused serious economic loss, to equipment, operation leaves many potential safety hazards.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of can realize the qualitative of valves leakage and quantitatively detection or on-line monitoring, interior leakage accuracy in detection is high, detection speed fast, leak detection method in the Automatic steam trap Trap detecting based on pipe surface temperature before valve of applied range.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
In the Automatic steam trap Trap that before valve, pipe surface temperature detects, leak a detection method, implementation step is as follows:
1) according to formula (1), calculate the normal pipe surface temperature of first representative point, the normal pipe surface temperature of second representative point respectively, described first representative point is positioned on the drain water piping of Automatic steam trap Trap front end to be detected the position near Automatic steam trap Trap to be detected, described second representative point is positioned on the drain water piping of Automatic steam trap Trap front end to be detected, and described second representative point on drain water piping, be positioned at first representative point front end and with first representative point spacing distance to a declared goal;
t
gb1=β
0'+β
1'
1(P/P
cr)+β
1'
2(P/P
cr)
2+β
2'
1(T/T
cr)+β
2'
2(T/T
cr)
2
+β
3'
1(L/L
max)+β
3'
2(L/L
max)
2+β
4'
1(D/D
max)+β
4'
2(D/D
max)
2 （1）
+β
5'
1(h
gb/h
gb-max)+β
5'
2(h
gb/h
gb-max)
2+β
6'
1(h
bw/h
bw-max)+β
6'
2(h
bw/h
bw-max)
2
+β
7'
1(t
a/t
a-max)+β
7'
2(t
a/t
a-max)
2+ε'
In formula (1), t
gb1the normal pipe surface temperature that represents first representative point or second representative point, β
0', β
1'
1, β
1'
2β '
71, β '
72the fitting coefficient that represents computer tube wall temperature, ε ' represents the stochastic error of computer tube wall temperature, P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, t
athe environment temperature that represents Automatic steam trap Trap front end drain water piping to be detected, t
a-maxthe environment maximum temperature that represents Automatic steam trap Trap front end drain water piping in steam drainage system of the same type;
2) detect respectively the pipe surface temperature of first representative point, second representative point, according to the normal pipe surface temperature of the actual measurement pipe surface temperature of first representative point, first representative point, calculate the observed temperature lift-off value of first representative point, according to the normal pipe surface temperature of the actual measurement pipe surface temperature of second representative point, second representative point, calculate the observed temperature lift-off value of second representative point; According to the actual measurement pipe surface temperature of the actual measurement pipe surface temperature of first representative point, second representative point, calculate the observed temperature difference between first representative point, second representative point;
3) specify respectively micro-leakage, general interior leakage or serious interior leakage rate threshold value of leaking; According to formula (2), calculate first representative point or second representative point the first temperature threshold value under micro-maximum leakage amount of sewing leakage quantity threshold value respectively respectively, according to formula (3), calculate first representative point or second representative point the second temperature threshold value under the minimum leakage amount of serious leakage rate threshold value respectively;
t
gb2-G100=β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L/L
max)+β
3''
2(L/L
max)
2+β
4''
1(D/D
max)+β
4''
2(D/D
max)
2 （2）
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G
1+β
7''
2G
1 2+β
7''
3G
1 3+ε''
t
gb3-G500=β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β'
2''
1(T/T
cr)+β'
2''
2(T/T
cr)
2
+β
3'''
1(L/L
max)+β
3'''
2(L/L
max)
2+β
4'''
1(D/D
max)+β
4'''
2(D/D
max)
2 （3）
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G
2+β
7'''
2G
2 2+β'
7''
3G
2 3+ε'''
In formula (2) and formula (3), t
gb2-G100represent first representative point or second representative point the first temperature threshold value under micro-maximum leakage amount of sewing leakage quantity threshold value respectively; t
gb3-G500represent first representative point or second representative point the second temperature threshold value under the minimum leakage amount of serious leakage rate threshold value respectively; β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3represent respectively the fitting coefficient of computer tube wall temperature, the stochastic error that ε ' ' represents computer tube wall temperature, β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature, P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, G
1represent micro-maximum leakage amount of sewing leakage quantity threshold value, G
2represent the minimum leakage amount of serious leakage rate threshold value;
4) select the actual measurement pipe surface temperature of first representative point or the actual measurement pipe surface temperature of second representative point to judge pipe surface temperature as leak condition, in leak condition, judge that pipe surface temperature is greater than under the prerequisite of normal pipe surface temperature of selected representative point, leak condition is judged to pipe surface temperature deducts the temperature gap that the normal pipe surface temperature of selected representative point obtains, then according to the leak condition of described temperature gap judgement Automatic steam trap Trap, if meet formula (4), judge that leak condition is in micro-leakage state, if meet formula (5), judge leak condition leakage state in general, if meet formula (6), judge leak condition leakage state in serious, if do not meet any one in formula (4), formula (5), formula (6), judge that Automatic steam trap Trap to be detected leakage detection of end does not occur or returns to execution step 2),
△t
s≤t
gb2-G100-t
gb1 （4）
t
gb2-G100-t
gb1<△t
s≤t
gb3-G500-t
gb1 （5）
△t
s>t
gb3-G500-t
gb1 （6）
In formula (4), formula (5) and formula (6), △ t
srepresent that leak condition judges that pipe surface temperature deducts the temperature gap that the normal pipe surface temperature of first representative point or second representative point obtains, t
gb2-G100represent the first temperature threshold value; t
gb3-G500represent the second temperature threshold value, t
gb1the normal pipe surface temperature that represents first representative point or second representative point; Using first representative point or second representative point as current representative point, redirect is carried out next step respectively;
5) the current leak condition obtaining according to judgement arranges a supposition leakage rate, if current leak condition is micro-leakage, according to formula (7), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate, if current leak condition is general interior leakage, according to formula (8), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate, if current leak condition is serious interior leakage, according to formula (9), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate;
△t
1=(β'
0'+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β'
2'
1(T/T
cr)+β'
2'
2(T/T
cr)
2
+β
3''
1(L/L
max)+β
3''
2(L/L
max)
2+β'
4'
1(D/D
max)+β'
4'
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β'
6'
1(h
bw/h
bw-max)+β'
6'
2(h
bw/h
bw-max)
2 （7）
+β'
7'
1G+β'
7'
2G
2+β'
7'
3G
3+ε'')-t
gb1
△t
2=(β'0''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β'
2''
1(T/T
cr)+β'
2''
2(T/T
cr)
2
+β
3'''
1(L/L
max)+β
3'''
2(L/L
max)
2+β'
4''
1(D/D
max)+β'
4''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β'
6''
1(h
bw/h
bw-max)+β'
6''
2(h
bw/h
bw-max)
2 （8）
+β'
7''
1G+β'
7''
2G
2+β'
7''
3G
3+ε''')-t
gb1
△t
3=(β'
0'''+β
1'''
1'(P/P
cr)+β
1''''
2(P/P
cr)
2+β'
2'''
1(T/T
cr)+β'
2'''
2(T/Tcr)
2
+β
3''''
1(L/L
max)+β
3''''
2(L/L
max)
2+β'
4'''
1(D/D
max)+β'
4'''
2(D/D
max)
2 （9）
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β'
6'''
1G+β'
6'''
2G
2+ε'''')-t
gb1
In formula (7), formula (8) and formula (9), △ t
1represent to suppose in micro-leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, △ t
2represent to suppose in general interior leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, △ t
3represent to suppose in serious interior leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ' ', β
1' '
1' ', β
1' '
2' ' ... β
6' ' '
1', β
6' ' '
2' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' ' represents the stochastic error of computer tube wall temperature; P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, G represents to suppose leakage rate; t
gb1the normal pipe surface temperature that represents current representative point;
6) judge current representative point corresponding theoretical lift-off value of temperature under supposition leakage rate formula (10) that whether satisfies condition, if can not satisfy condition formula (10), return to again iteration execution step 5); If the formula of satisfying condition (10), will supposition leakage rate as leakage rate corresponding to current representative point, redirect execution step 7 after obtaining the leakage rate that first representative point or second representative point are corresponding);
|△t
jd-
△t
s|/△t
s≤0
.1% （10）
In formula (10), △ t
jdthe theoretical lift-off value of temperature that represents current representative point correspondence under supposition leakage rate, △ t
sthe observed temperature lift-off value that represents current representative point;
7) the current leak condition obtaining according to judgement arranges a supposition leakage rate, if current leak condition is micro-leakage, according to formula (11), calculates the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point; If current leak condition is general interior leakage, according to formula (12), calculate the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point, if current leak condition is serious interior leakage, according to formula (13), calculate the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point;
δt
1=[β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L
1/L
max)+β
3''
2(L
1/L
max)
2+β'
4'
1(D/D
max)+β'
4'
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G+β
7''
2G
2+β
7''
3G
3+ε''] （11）
-[β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L
2/L
max)+β
3''
2(L
2/L
max)
2+β
4''
1(D/D
max)+β
4''
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G+β
7''
2G
2+β
7''
3G
3+ε'']
δt
2=[β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β
2'''
1(T/T
cr)+β
2'''
2(T/T
cr)
2
+β
3'''
1(L
1/L
max)+β
3'''
2(L
1/L
max)
2+β
4'''
1(D/D
max)+β
4'''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G+β
7'''
2G
2+β'
7''
3G
3+ε'''] （12）
-[β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β
2'''
1(T/T
cr)+β
2'''
2(T/T
cr)
2
+β
3'''
1(L
2/L
max)+β
3'''
2(L
2/L
max)
2+β'
4''
1(D/D
max)+β
4'''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G+β
7'''
2G
2+β'
7''
3G
3+ε''']
δt
3=[β
0''''+β
1'''
1'(P/P
cr)+β
1'''
2'(P/P
cr)
2+β
2''''
1(T/T
cr)+β
2''''
2(T/T
cr)
2
+β
3''''
1(L
1/L
max)+β
3''''
2(L
1/L
max)
2+β'
4'''
1(D/D
max)+β'
4'''
2(D/D
max)
2
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β
6''''
1G+β
6''''
2G
2+ε'''']（13）
-[β
0''''+β
1'''
1'(P/P
cr)+β
1'''
2'(P/P
cr)
2+β
2''''
1(T/T
cr)+β
2''''
2(T/T
cr)
2
+β
3''''
1(L
2/L
max)+β
3''''
2(L
2/L
max)
2+β
4''''
1(D/D
max)+β
4''''
2(D/D
max)
2
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β
6''''
1G+β
6''''
2G
2+ε'''']
In formula (11), formula (12) and formula (13), δ t
1represent the theoretical temperatures difference under supposition leakage rate between first representative point in micro-leakage situation, second representative point, δ t
2represent the theoretical temperatures difference under supposition leakage rate between first representative point under general leakage situation, second representative point, δ t
3represent the theoretical temperatures difference under supposition leakage rate between first representative point under serious leakage situation, second representative point, β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ' ', β
1' '
1' ', β
1' '
2' ' ... β
6' ' '
1', β
6' ' '
2' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' ' represents the stochastic error of computer tube wall temperature; P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L
1the length that represents first representative point leading portion drain water piping, L2 represents the length of second representative point leading portion drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, G represents to suppose leakage rate;
8) judge between first representative point, second representative point whether the observed temperature difference between theoretical temperatures difference under supposition leakage rate and first representative point, second representative point meets formula (14), if meet formula (14), leakage rate corresponding to temperature gap using current supposition leakage rate as first representative point, between second representative point, redirect performs step 9), otherwise redirect execution step 7) again suppose that leakage rate is to determine leakage rate corresponding to temperature gap between first representative point, second representative point;
|δ
jd-δ
s|/δ
s≤0
.1% （14）
In formula (14), δ
jdrepresent the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point, δ
srepresent the observed temperature difference between first representative point, second representative point;
9) according to selecting one to sew leakage quantity output as in Automatic steam trap Trap to be detected final in the leakage rate three that between leakage rate corresponding to leakage rate corresponding to first representative point, second representative point and first representative point, second representative point, temperature gap is corresponding.
Further, described step 9) implementation step is as follows: judge the leakage rate that first representative point is corresponding, second leakage rate and first representative point that representative point is corresponding, whether the leakage rate three that between second representative point, temperature gap is corresponding meets formula (15), if meet formula (15), from leakage rate corresponding to described first representative point, second leakage rate and first representative point that representative point is corresponding, in the leakage rate that between second representative point, temperature gap is corresponding, select arbitrarily one as in Automatic steam trap Trap to be detected final, to sew leakage quantity output, otherwise sew leakage quantity output in final using leakage rate corresponding to first representative point as Automatic steam trap Trap to be detected,
| G
11-G
12|/G
11≤ 1% and | G
11-G
13|/G
11≤ 1% (15)
In formula (15), G
11represent the leakage rate that first representative point is corresponding, G
12represent second leakage rate that representative point is corresponding, G
13represent leakage rate corresponding to temperature gap between first representative point, second representative point.
The interior detection method of leaking of Automatic steam trap Trap that the present invention is based on the front pipe surface temperature detection of valve has following advantage:
1, the normal pipe surface temperature of calculation representative point of the present invention, the leak condition of judgement Automatic steam trap Trap, the theoretical lift-off value of temperature of calculation representative point correspondence under supposition leakage rate, calculate first representative point, between second representative point, in supposition during the theoretical temperatures difference under leakage rate, above-mentioned calculating is all based upon on the basis of generic physical model of steam drainage system, has considered the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, the emergent pressure of steam, the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, the emergent pressure of steam, the length of representative point front end drain water piping, the maximum length of drain water piping, the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, the maximum internal diameter of the pipeline of drain water piping, the pipe thickness of Automatic steam trap Trap front end drain water piping to be detected, drain water piping tube wall maximum ga(u)ge, the insulation layer thickness of Automatic steam trap Trap front end drain water piping to be detected, the heat-insulation layer maximum ga(u)ge of drain water piping, the environment temperature of Automatic steam trap Trap front end drain water piping to be detected, the environment maximum temperature of Automatic steam trap Trap front end drain water piping, according to steam, steam water interface, flowing and diabatic process feature of water, combine theoretical calculation method and actual temperature detection, utilize theoretical calculation method to obtain reference temperature point and the temperature rise amplitude standard of valve leak Diagnosis of Work Conditions, for leaking Diagnosis of Work Conditions, provide theoretical foundation, the situation that can reflect timely and accurately valve leak, not only can overhaul according to the arrangement of valve running status, avoid the planned shutdown maintenance of current power plant, and reduced generating plant valve flow, reduce operation for power consumption coal, improved thermal power plant's performance driving economy, and the quantitative detection of leakage rate is tested reference frame is provided for thermal loss of steam turbine, can overcome the problem that influences each other in complicated drain water piping system, can realize the qualitative of valves leakage and quantitatively detect or on-line monitoring, having advantages of that interior leakage accuracy in detection is high, detection speed fast, applied range.
2, the present invention selects one as in Automatic steam trap Trap to be detected final, to sew leakage quantity output according to leakage rate three corresponding to temperature gap between leakage rate corresponding to leakage rate corresponding to first representative point, second representative point and first representative point, second representative point, no matter be that thermal source is near some representative points, or thermal source is simultaneously near two representative points, the present invention all can get rid of the impact that thermal source detects valves leakage by the way, and valves leakage is detected accurately and reliably.
Accompanying drawing explanation
Fig. 1 is the basic skills schematic flow sheet of the embodiment of the present invention.
Fig. 2 is the structural representation of the steam drainage system of application the present embodiment method.
Fig. 3 judges the schematic flow sheet of leak condition in the embodiment of the present invention.
Fig. 4 is the schematic flow sheet of the leakage rate that in the embodiment of the present invention, calculation representative point is corresponding.
Fig. 5 is the schematic flow sheet that calculates the leakage rate that between first representative point, second representative point, temperature gap is corresponding in the embodiment of the present invention.
Fig. 6 selects a leakage rate as the schematic flow sheet of sewing leakage quantity output in Automatic steam trap Trap to be detected final in the embodiment of the present invention.
Embodiment
As shown in Figure 1, to leak the step of detection method before based on valve in the Automatic steam trap Trap that detects of pipe surface temperature as follows for the present embodiment:
1) according to formula (1), calculate the normal pipe surface temperature of first representative point, the normal pipe surface temperature of second representative point respectively, first representative point is positioned on the drain water piping of Automatic steam trap Trap front end to be detected the position near Automatic steam trap Trap to be detected, second representative point is positioned on the drain water piping of Automatic steam trap Trap front end to be detected, and second representative point on drain water piping, be positioned at first representative point front end and with first representative point spacing distance to a declared goal;
t
gb1=β
0'+β
1'
1(P/P
cr)+β
1'
2(P/P
cr)
2+β
2'
1(T/T
cr)+β
2'
2(T/T
cr)
2
+β
3'
1(L/L
max)+β
3'
2(L/L
max)
2+β
4'
1(D/D
max)+β
4'
2(D/D
max)
2（1）
+β
5'
1(h
gb/h
gb-max)+β
5'
2(h
gb/h
gb-max)
2+β
6'
1(h
bw/h
bw-max)+β
6'
2(h
bw/h
bw-max)
2
+β
7'
1(t
a/t
a-max)+β
7'
2(t
a/t
a-max)
2+ε'
In formula (1), t
gb1the normal pipe surface temperature that represents first representative point or second representative point, β
0', β
1'
1, β
1'
2β '
71, β '
72the fitting coefficient that represents computer tube wall temperature, ε ' represents the stochastic error of computer tube wall temperature, P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, t
athe environment temperature that represents Automatic steam trap Trap front end drain water piping to be detected, t
a-maxthe environment maximum temperature that represents Automatic steam trap Trap front end drain water piping in steam drainage system of the same type.
As shown in Figure 2, in the steam drainage system of application the present embodiment method, the condenser of steam drainage system is communicated with jet chimney 1 by drain water piping 2, and drain water piping 2 is provided with Automatic steam trap Trap 3 to be detected.First representative point that on the drain water piping 2 of label location 5 expression Automatic steam trap Trap 3 front ends to be detected, the position of close Automatic steam trap Trap 3 to be detected is provided with, label location 4 represents second representative point that the drain water piping 2 of Automatic steam trap Trap 3 front ends to be detected is provided with, spacing distance to a declared goal between label location 4 and label location 5.
2) detect respectively the pipe surface temperature of first representative point, second representative point, according to the normal pipe surface temperature of the actual measurement pipe surface temperature of first representative point, first representative point, calculate the observed temperature lift-off value of first representative point, according to the normal pipe surface temperature of the actual measurement pipe surface temperature of second representative point, second representative point, calculate the observed temperature lift-off value of second representative point; According to the actual measurement pipe surface temperature of the actual measurement pipe surface temperature of first representative point, second representative point, calculate the observed temperature difference between first representative point, second representative point.
3) specify respectively micro-leakage, general interior leakage or serious interior leakage rate threshold value of leaking; According to formula (2), calculate first representative point or second representative point the first temperature threshold value under micro-maximum leakage amount of sewing leakage quantity threshold value respectively respectively, according to formula (3), calculate first representative point or second representative point the second temperature threshold value under the minimum leakage amount of serious leakage rate threshold value respectively;
t
gb2-G100=β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L/L
max)+β
3''
2(L/L
max)
2+β
4''
1(D/D
max)+β
4''
2(D/D
max)
2（2）
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G
1+β
7''
2G
1 2+β
7''
3G
1 3+ε''
t
gb3-G500=β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β'
2''
1(T/T
cr)+β'
2''
2(T/T
cr)
2
+β
3'''
1(L/L
max)+β
3'''
2(L/L
max)
2+β
4'''
1(D/D
max)+β
4'''
2(D/D
max)
2（3）
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G
2+β'
7''
2G
2 2+β'
7''
3G
2 3+ε'''
In formula (2) and formula (3), t
gb2-G100represent first representative point or second representative point the first temperature threshold value under micro-maximum leakage amount of sewing leakage quantity threshold value respectively; t
gb3-G500represent first representative point or second representative point the second temperature threshold value under the minimum leakage amount of serious leakage rate threshold value respectively; β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3represent respectively the fitting coefficient of computer tube wall temperature, the stochastic error that ε ' ' represents computer tube wall temperature, β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature, P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap 3 front ends to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap 3 front ends to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping 2, L
maxthe maximum length that represents drain water piping 2 in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping 2 in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, h
gb-maxrepresent drain water piping 2 tube wall maximum ga(u)ges in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping 2 in steam drainage system of the same type, G
1represent micro-maximum leakage amount of sewing leakage quantity threshold value, G
2represent the minimum leakage amount of serious leakage rate threshold value.
In the present embodiment, specify micro-leakage, general interior leakage or serious interior leakage rate threshold value of leaking specifically as shown in table 1.
Table 1: the leakage rate threshold value table of three kinds of leak condition.
Referring to table 1, when the valve latus rectum of Automatic steam trap Trap 3 to be detected is not more than DN50mm, if leakage rate is less than or equal to 100kg/h, leak condition is judged to be to micro-leakage, if leakage rate, between 100～500kg/h, is judged to be leak condition general leakage, if leakage rate is greater than 500kg/h, leak condition is judged to be to serious leakage, now t
gb2-G100represent first representative point or second representative point the first temperature threshold value under 100kg/h leakage rate respectively; t
gb3-G500represent first representative point or second representative point the second temperature threshold value under 500kg/h leakage rate respectively; When the valve latus rectum of Automatic steam trap Trap 3 to be detected is greater than DN50mm, if leakage rate is less than or equal to 500kg/h, leak condition is judged to be to micro-leakage, if leakage rate is between 500～1500kg/h, leak condition is judged to be to general leakage, if leakage rate is greater than 1500kg kg/h, leak condition is judged to be to serious leakage, now t
gb2-G100represent first representative point or second representative point the first temperature threshold value under 500kg/h leakage rate respectively; t
gb3-G500represent first representative point or second representative point the second temperature threshold value under 1500kg/h leakage rate respectively.
4) as shown in Figure 3, select the actual measurement pipe surface temperature of first representative point or the actual measurement pipe surface temperature of second representative point to judge pipe surface temperature as leak condition, in leak condition, judge that pipe surface temperature is greater than under the prerequisite of normal pipe surface temperature of selected representative point, leak condition is judged to pipe surface temperature deducts the temperature gap that the normal pipe surface temperature of selected representative point obtains, then according to the leak condition of temperature gap judgement Automatic steam trap Trap 3, as shown in Figure 3, if meet formula (4), judge that leak condition is in micro-leakage state, if meet formula (5), judge leak condition leakage state in general, if meet formula (6), judge leak condition leakage state in serious, if do not meet any one in formula (4), formula (5), formula (6), judge that Automatic steam trap Trap 3 to be detected leakage detection of end does not occur or returns to execution step 2), if judged when leakage detection of end do not occur Automatic steam trap Trap 3 to be detected, the present embodiment leaks detected state for realizing in single, if return to execution step 2), the present embodiment is to leak online detected state in realizing.
△t
s≤t
gb2-G100-t
gb1 （4）
t
gb2-G100-t
gb1<△t
s≤t
gb3-G500-t
gb1 （5）
△t
s>t
gb3-G500-t
gb1 （6）
In formula (4), formula (5) and formula (6), △ t
srepresent that leak condition judges that pipe surface temperature deducts the temperature gap that the normal pipe surface temperature of first representative point or second representative point obtains, t
gb2-G100represent the first temperature threshold value; t
gb3-G500represent the second temperature threshold value, t
gb1the normal pipe surface temperature that represents first representative point or second representative point; Using first representative point or second representative point as current representative point, redirect is carried out next step and is started to perform step 5 respectively).
As shown in Figure 4, the present embodiment adopts hypothesis process of iteration to calculate respectively the leakage rate that two representative points (first representative point and second representative point) are corresponding, and its detailed step is referring to following step 5) and step 6).
5) the current leak condition obtaining according to judgement arranges a supposition leakage rate, if current leak condition is micro-leakage, according to formula (7), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate, if current leak condition is general interior leakage, according to formula (8), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate, if current leak condition is serious interior leakage, according to formula (9), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate;
△t
1=(β'
0'+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β'
2'
1(T/T
cr)+β'
2'
2(T/T
cr)
2
+β
3''
1(L/L
max)+β
3''
2(L/L
max)
2+β'
4'
1(D/D
max)+β'
4'
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β'
6'
1(h
bw/h
bw-max)+β'
6'
2(h
bw/h
bw-max)
2 （7）
+β'
7'
1G+β'
7'
2G
2+β'
7'
3G
3+ε'')-t
gb1
△t
2=(β'
0''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β'
2''
1(T/T
cr)+β'
2''
2(T/T
cr)
2
+β
3'''
1(L/L
max)+β
3'''
2(L/L
max)
2+β'
4''
1(D/D
max)+β'
4''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β'
6''
1(h
bw/h
bw-max)+β'
6''
2(h
bw/h
bw-max)
2 （8）
+β'
7''
1G+β'
7''
2G
2+β'
7''
3G
3+ε''')-t
gb1
△t
3=(β'
0'''+β
1'''
1'(P/P
cr)+β
1''''
2(P/P
cr)
2+β'
2'''
1(T/T
cr)+β'
2'''
2(T/T
cr)
2
+β
3''''
1(L/L
max)+β
3''''
2(L/L
max)
2+β'
4'''
1(D/D
max)+β'
4'''
2(D/D
max)
2 （9）
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β'
6'''
1G+β'
6'''
2G
2+ε'''')-t
gb1
In formula (7), formula (8) and formula (9), △ t
1represent to suppose in micro-leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, △ t
2represent to suppose in general interior leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, △ t
3represent to suppose in serious interior leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ' ', β
1' '
1' ', β
1' '
2' ' ... β
6' ' '
1', β
6' ' '
2' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' ' represents the stochastic error of computer tube wall temperature; P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap 3 front ends to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap 3 front ends to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping 2, L
maxthe maximum length that represents drain water piping 2 in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping 2 in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, h
gb-maxrepresent drain water piping 2 tube wall maximum ga(u)ges in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping 2 in steam drainage system of the same type, G represents to suppose leakage rate; t
gb1the normal pipe surface temperature that represents current representative point.
6) judge current representative point corresponding theoretical lift-off value of temperature under supposition leakage rate formula (10) that whether satisfies condition, if can not satisfy condition formula (10), return to again iteration execution step 5); If the formula of satisfying condition (10), will supposition leakage rate as leakage rate corresponding to current representative point, redirect execution step 7 after obtaining the leakage rate that first representative point or second representative point are corresponding);
|△t
jd-△t
s|/△t
s≤0.1% （
10）
In formula (10), △ t
jdthe theoretical lift-off value of temperature that represents current representative point correspondence under supposition leakage rate, △ t
sthe observed temperature lift-off value that represents current representative point.
As shown in Figure 5, the present embodiment adopts hypothesis process of iteration to calculate leakage rate corresponding to temperature gap between first representative point, second representative point, and its detailed step is referring to following step 7) and step 8).
7) the current leak condition obtaining according to judgement arranges a supposition leakage rate, if current leak condition is micro-leakage, according to formula (11), calculates the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point; If current leak condition is general interior leakage, according to formula (12), calculate the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point, if current leak condition is serious interior leakage, according to formula (13), calculate the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point;
δt
1=[β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L
1/L
max)+β
3''
2(L
1/L
max)
2+β'
4'
1(D/D
max)+β'
4'
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G+β
7''
2G
2+β
7''
3G
3+ε''] （11）
-[β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L
2/L
max)+β
3''
2(L
2/L
max)
2+β
4''
1(D/D
max)+β
4''
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G+β
7''
2G
2+β
7''
3G
3+ε'']
δt
2=[β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β
2'''
1(T/T
cr)+β
2'''
2(T/T
cr)
2
+β
3'''
1(L
1/L
max)+β
3'''
2(L
1/L
max)
2+β
4'''
1(D/D
max)+β
4'''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G+β'
7''
2G
2+β'
7''
3G
3+ε'''] （12）
-[β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β
2'''
1(T/T
cr)+β
2'''
2(T/T
cr)
2
+β
3'''
1(L
2/L
max)+β
3'''
2(L
2/L
max)
2+β'
4''
1(D/D
max)+β
4'''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G+β'
7''
2G
2+β'
7''
3G
3+ε''']
δt
3=[β
0''''+β
1'''
1'(P/P
cr)+β
1'''
2'(P/P
cr)
2+β
2''''
1(T/T
cr)+β
2''''
2(T/T
cr)
2
+β
3''''
1(L
1/L
max)+β
3''''
2(L
1/L
max)
2+β'
4'''
1(D/D
max)+β'
4'''
2(D/D
max)
2
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β
6''''
1G+β
6''''
2G
2+ε'''']（13）
-[β
0''''+β
1'''
1'(P/P
cr)+β
1'''
2'(P/P
cr)
2+β
2''''
1(T/T
cr)+β
2''''
2(T/T
cr)
2
+β
3''''
1(L
2/L
max)+β
3''''
2(L
2/L
max)
2+β
4''''
1(D/D
max)+β
4''''
2(D/D
max)
2
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β
6''''
1G+β
6''''
2G
2+ε'''']
In formula (11), formula (12) and formula (13), δ t
1represent the theoretical temperatures difference under supposition leakage rate between first representative point in micro-leakage situation, second representative point, δ t
2represent the theoretical temperatures difference under supposition leakage rate between first representative point under general leakage situation, second representative point, δ t
3represent the theoretical temperatures difference under supposition leakage rate between first representative point under serious leakage situation, second representative point, β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ' ', β
1' '
1' ', β
1' '
2' ' ... β
6' ' '
1', β
6' ' '
2' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' ' represents the stochastic error of computer tube wall temperature; P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap 3 front ends to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap 3 front ends to be detected, T
crrepresent the critical temperature of steam, L
1the length that represents first representative point leading portion drain water piping 2, L
2the length that represents second representative point leading portion drain water piping 2, L
maxthe maximum length that represents drain water piping 2 in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping 2 in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, h
gb-maxrepresent drain water piping 2 tube wall maximum ga(u)ges in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap 3 front end drain water pipings 2 to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping 2 in steam drainage system of the same type, G represents to suppose leakage rate.
8) judge between first representative point, second representative point whether the observed temperature difference between theoretical temperatures difference under supposition leakage rate and first representative point, second representative point meets formula (14), if meet formula (14), leakage rate corresponding to temperature gap using current supposition leakage rate as first representative point, between second representative point, redirect performs step 9), otherwise redirect execution step 7) again suppose that leakage rate is to determine leakage rate corresponding to temperature gap between first representative point, second representative point;
|δ
jd-δ
s|/δ
s≤0.1% （14）
In formula (14), δ
jdrepresent the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point, δ
srepresent the observed temperature difference between first representative point, second representative point.
9) according to selecting one to sew leakage quantity output as in Automatic steam trap Trap 3 to be detected final in the leakage rate three that between leakage rate corresponding to leakage rate corresponding to first representative point, second representative point and first representative point, second representative point, temperature gap is corresponding.
As shown in Figure 6, in the present embodiment, step 9) implementation step is as follows: judge the leakage rate that first representative point is corresponding, second leakage rate and first representative point that representative point is corresponding, whether the leakage rate three that between second representative point, temperature gap is corresponding meets formula (15), if meet formula (15), from leakage rate corresponding to first representative point, second leakage rate and first representative point that representative point is corresponding, in the leakage rate that between second representative point, temperature gap is corresponding, select arbitrarily one as in Automatic steam trap Trap 3 to be detected final, to sew leakage quantity output, otherwise sew leakage quantity output in final using leakage rate corresponding to first representative point as Automatic steam trap Trap 3 to be detected,
| G
11-G
12|/G
11≤ 1% and | G
11-G
13|/G
11≤ 1% (15)
In formula (15), G
11represent the leakage rate that first representative point is corresponding, G
12represent second leakage rate that representative point is corresponding, G
13represent leakage rate corresponding to temperature gap between first representative point, second representative point.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. in the Automatic steam trap Trap detecting based on pipe surface temperature before valve, leak a detection method, it is characterized in that implementation step is as follows:
1) according to formula (1), calculate the normal pipe surface temperature of first representative point, the normal pipe surface temperature of second representative point respectively, described first representative point is positioned on the drain water piping of Automatic steam trap Trap front end to be detected the position near Automatic steam trap Trap to be detected, described second representative point is positioned on the drain water piping of Automatic steam trap Trap front end to be detected, and described second representative point on drain water piping, be positioned at first representative point front end and with first representative point spacing distance to a declared goal;
t
gb1=β
0'+β
1'
1(P/P
cr)+β
1'
2(P/P
cr)
2+β
2'
1(T/T
cr)+β
2'
2(T/T
cr)
2
+β
3'
1(L/L
max)+β
3'
2(L/L
max)
2+β
4'
1(D/D
max)+β
4'
2(D/D
max)
2 （1）
+β
5'
1(h
gb/h
gb-max)+β
5'
2(h
gb/h
gb-max)
2+β
6'
1(h
bw/h
bw-max)+β
6'
2(h
bw/h
bw-max)
2
+β
7'
1(t
a/t
a-max)+β
7'
2(t
a/t
a-max)
2+ε'
In formula (1), t
gb1the normal pipe surface temperature that represents first representative point or second representative point, β
0', β
1'
1, β
1'
2β '
71, β '
72the fitting coefficient that represents computer tube wall temperature, ε ' represents the stochastic error of computer tube wall temperature, P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, t
athe environment temperature that represents Automatic steam trap Trap front end drain water piping to be detected, t
a-maxthe environment maximum temperature that represents Automatic steam trap Trap front end drain water piping in steam drainage system of the same type;
2) detect respectively the pipe surface temperature of first representative point, second representative point, according to the normal pipe surface temperature of the actual measurement pipe surface temperature of first representative point, first representative point, calculate the observed temperature lift-off value of first representative point, according to the normal pipe surface temperature of the actual measurement pipe surface temperature of second representative point, second representative point, calculate the observed temperature lift-off value of second representative point; According to the actual measurement pipe surface temperature of the actual measurement pipe surface temperature of first representative point, second representative point, calculate the observed temperature difference between first representative point, second representative point;
3) specify respectively micro-leakage, general interior leakage or serious interior leakage rate threshold value of leaking; According to formula (2), calculate first representative point or second representative point the first temperature threshold value under micro-maximum leakage amount of sewing leakage quantity threshold value respectively respectively, according to formula (3), calculate first representative point or second representative point the second temperature threshold value under the minimum leakage amount of serious leakage rate threshold value respectively;
t
gb2-G100=β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L/L
max)+β
3''
2(L/L
max)
2+β
4''
1(D/D
max)+β
4''
2(D/D
max)
2 （2）
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G
1+β
7''
2G
1 2+β
7''
3G
1 3+ε''
t
gb3-G500=β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β'
2''
1(T/T
cr)+β'
2''
2(T/T
cr)
2
+β
3'''
1(L/L
max)+β
3'''
2(L/L
max)
2+β
4'''
1(D/D
max)+β
4'''
2(D/D
max)
2 （3）
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G
2+β
7'''
2G
2 2+β'
7''
3G
2 3+ε'''
In formula (2) and formula (3), t
gb2-G100represent first representative point or second representative point the first temperature threshold value under micro-maximum leakage amount of sewing leakage quantity threshold value respectively; t
gb3-G500represent first representative point or second representative point the second temperature threshold value under the minimum leakage amount of serious leakage rate threshold value respectively; β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3represent respectively the fitting coefficient of computer tube wall temperature, the stochastic error that ε ' ' represents computer tube wall temperature, β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature, P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, G
1represent micro-maximum leakage amount of sewing leakage quantity threshold value, G
2represent the minimum leakage amount of serious leakage rate threshold value;
4) select the actual measurement pipe surface temperature of first representative point or the actual measurement pipe surface temperature of second representative point to judge pipe surface temperature as leak condition, in leak condition, judge that pipe surface temperature is greater than under the prerequisite of normal pipe surface temperature of selected representative point, leak condition is judged to pipe surface temperature deducts the temperature gap that the normal pipe surface temperature of selected representative point obtains, then according to the leak condition of described temperature gap judgement Automatic steam trap Trap, if meet formula (4), judge that leak condition is in micro-leakage state, if meet formula (5), judge leak condition leakage state in general, if meet formula (6), judge leak condition leakage state in serious, if do not meet any one in formula (4), formula (5), formula (6), judge that Automatic steam trap Trap to be detected leakage detection of end does not occur or returns to execution step 2),
△t
s≤t
gb2-G100-t
gb1 （4）
t
gb2-G100-t
gb1<△t
s≤t
gb3-G500-t
gb1 （5）
△t
s>t
gb3-G500-t
gb1 （6）
In formula (4), formula (5) and formula (6), △ t
srepresent that leak condition judges that pipe surface temperature deducts the temperature gap that the normal pipe surface temperature of first representative point or second representative point obtains, t
gb2-G100represent the first temperature threshold value; t
gb3-G500represent the second temperature threshold value, t
gb1the normal pipe surface temperature that represents first representative point or second representative point; Using first representative point or second representative point as current representative point, redirect is carried out next step respectively;
5) the current leak condition obtaining according to judgement arranges a supposition leakage rate, if current leak condition is micro-leakage, according to formula (7), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate, if current leak condition is general interior leakage, according to formula (8), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate, if current leak condition is serious interior leakage, according to formula (9), calculate the theoretical lift-off value of temperature of current representative point correspondence under supposition leakage rate;
△t
1=(β'
0'+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β'
2'
1(T/T
cr)+β'
2'
2(T/T
cr)
2
+β
3''
1(L/L
max)+β
3''
2(L/L
max)
2+β'
4'
1(D/D
max)+β'
4'
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β'
6'
1(h
bw/h
bw-max)+β'
6'
2(h
bw/h
bw-max)
2 （7）
+β'
7'
1G+β'
7'
2G
2+β'
7'
3G
3+ε'')-t
gb1
△t
2=(β'
0''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β'
2''
1(T/T
cr)+β'
2''
2(T/T
cr)
2
+β
3'''
1(L/L
max)+β
3'''
2(L/L
max)
2+β'
4''
1(D/D
max)+β'
4''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β'
6''
1(h
bw/h
bw-max)+β'
6''
2(h
bw/h
bw-max)
2 （8）
+β'
7''
1G+β'
7''
2G
2+β'
7''
3G
3+ε''')-t
gb1
△t
3=(β'
0'''+β
1'''
1'(P/P
cr)+β
1''''
2(P/P
cr)
2+β'
2'''
1(T/T
cr)+β'
2'''
2(T/T
cr)
2
+β
3''''
1(L/L
max)+β
3''''
2(L/L
max)
2+β'
4'''
1(D/D
max)+β'
4'''
2(D/D
max)
2 （9）
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β'
6'''
1G+β'
6'''
2G
2+ε'''')-t
gb1
In formula (7), formula (8) and formula (9), △ t
1represent to suppose in micro-leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, △ t
2represent to suppose in general interior leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, △ t
3represent to suppose in serious interior leakage situation the theoretical lift-off value of temperature of the current representative point that leakage rate is corresponding, β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ' ', β
1' '
1' ', β
1' '
2' ' ... β
6' ' '
1', β
6' ' '
2' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' ' represents the stochastic error of computer tube wall temperature; P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L represents the length of first representative point front end or second representative point front end drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, G represents to suppose leakage rate; t
gb1the normal pipe surface temperature that represents current representative point;
6) judge current representative point corresponding theoretical lift-off value of temperature under supposition leakage rate formula (10) that whether satisfies condition, if can not satisfy condition formula (10), return to again iteration execution step 5); If the formula of satisfying condition (10), will supposition leakage rate as leakage rate corresponding to current representative point, redirect execution step 7 after obtaining the leakage rate that first representative point or second representative point are corresponding);
|△t
jd-△t
s|/△t
s≤0.1% （10）
In formula (10), △ t
jdthe theoretical lift-off value of temperature that represents current representative point correspondence under supposition leakage rate, △ t
sthe observed temperature lift-off value that represents current representative point;
7) the current leak condition obtaining according to judgement arranges a supposition leakage rate, if current leak condition is micro-leakage, according to formula (11), calculates the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point; If current leak condition is general interior leakage, according to formula (12), calculate the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point, if current leak condition is serious interior leakage, according to formula (13), calculate the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point;
δt
1=[β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L
1/L
max)+β
3''
2(L
1/L
max)
2+β'
4'
1(D/D
max)+β'
4'
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G+β
7''
2G
2+β
7''
3G
3+ε''] （11）
-[β
0''+β
1''
1(P/P
cr)+β
1''
2(P/P
cr)
2+β
2''
1(T/T
cr)+β
2''
2(T/T
cr)
2
+β
3''
1(L
2/L
max)+β
3''
2(L
2/L
max)
2+β
4''
1(D/D
max)+β
4''
2(D/D
max)
2
+β
5''
1(h
gb/h
gb-max)+β
5''
2(h
gb/h
gb-max)
2+β
6''
1(h
bw/h
bw-max)+β
6''
2(h
bw/h
bw-max)
2
+β
7''
1G+β
7''
2G
2+β
7''
3G
3+ε'']
δt
2=[β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β
2'''
1(T/T
cr)+β
2'''
2(T/T
cr)
2
+β
3'''
1(L
1/L
max)+β
3'''
2(L
1/L
max)
2+β
4'''
1(D/D
max)+β
4'''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G+β
7'''
2G
2+β’
7''
3G
3+ε'''] （12）
-[β
0'''+β
1'''
1(P/P
cr)+β
1'''
2(P/P
cr)
2+β
2'''
1(T/T
cr)+β
2'''
2(T/T
cr)
2
+β
3'''
1(L
2/L
max)+β
3'''
2(L
2/L
max)
2+β'
4''
1(D/D
max)+β
4'''
2(D/D
max)
2
+β
5'''
1(h
gb/h
gb-max)+β
5'''
2(h
gb/h
gb-max)
2+β
6'''
1(h
bw/h
bw-max)+β
6'''
2(h
bw/h
bw-max)
2
+β
7'''
1G+β
7'''
2G
2+β'
7''
3G
3+ε''']
δt
3=[β
0''''+β
1'''
1'(P/P
cr)+β
1'''
2'(P/P
cr)
2+β
2''''
1(T/T
cr)+β
2''''
2(T/T
cr)
2
+β
3''''
1(L
1/L
max)+β
3''''
2(L
1/L
max)
2+β'
4'''
1(D/D
max)+β'
4'''
2(D/D
max)
2
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(h
bw/h
bw-max)
2+β
6''''
1G+β
6''''
2G
2+ε''''] （13）
-[β
0''''+β
1'''
1'(P/P
cr)+β
1'''
2'(P/P
cr)
2+β
2''''
1(T/T
cr)+β
2''''
2(T/T
cr)
2
+β
3''''
1(L
2/L
max)+β
3''''
2(L
2/L
max)
2+β
4''''
1(D/D
max)+β
4''''
2(D/D
max)
2
+β
5''''
1(h
bw/h
bw-max)+β
5''''
2(hb
w/h
bw-max)
2+β
6''''
1G+β
6''''
2G
2+ε'''']
In formula (11), formula (12) and formula (13), δ t
1represent the theoretical temperatures difference under supposition leakage rate between first representative point in micro-leakage situation, second representative point, δ t
2represent the theoretical temperatures difference under supposition leakage rate between first representative point under general leakage situation, second representative point, δ t
3represent the theoretical temperatures difference under supposition leakage rate between first representative point under serious leakage situation, second representative point, β
0' ', β
1' '
1, β
1' '
2... β '
7'
1, β '
7'
2, β '
7'
3the fitting coefficient that represents respectively computer tube wall temperature, ε ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ', β
1' ' '
1, β
1' ' '
2... β '
7' '
1, β '
7' '
2, β
7' '
3' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' represents the stochastic error of computer tube wall temperature; β
0' ' ' ', β
1' '
1' ', β
1' '
2' ' ... β
6' ' '
1', β
6' ' '
2' representing respectively the fitting coefficient of computer tube wall temperature, ε ' ' ' ' represents the stochastic error of computer tube wall temperature; P represents the vapor pressure of carrying in the pipeline of Automatic steam trap Trap front end to be detected, P
crthe emergent pressure that represents steam, T represents the vapor (steam) temperature of carrying in the pipeline of Automatic steam trap Trap front end to be detected, T
crrepresent the critical temperature of steam, L
1the length that represents first representative point leading portion drain water piping, L
2the length that represents second representative point leading portion drain water piping, L
maxthe maximum length that represents drain water piping in steam drainage system of the same type, D represents the internal diameter of Automatic steam trap Trap front end drain water piping to be detected, D
maxrepresent the maximum internal diameter of the pipeline of drain water piping in steam drainage system of the same type, h
gbthe pipe thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
gb-maxrepresent drain water piping tube wall maximum ga(u)ge in steam drainage system of the same type, h
bwthe insulation layer thickness that represents Automatic steam trap Trap front end drain water piping to be detected, h
bw-maxthe heat-insulation layer maximum ga(u)ge that represents drain water piping in steam drainage system of the same type, G represents to suppose leakage rate;
8) judge between first representative point, second representative point whether the observed temperature difference between theoretical temperatures difference under supposition leakage rate and first representative point, second representative point meets formula (14), if meet formula (14), leakage rate corresponding to temperature gap using current supposition leakage rate as first representative point, between second representative point, redirect performs step 9), otherwise redirect execution step 7) again suppose that leakage rate is to determine leakage rate corresponding to temperature gap between first representative point, second representative point;
|δ
jd-δ
s|/δ
s≤0.1% （14）
In formula (14), δ
jdrepresent the theoretical temperatures difference under supposition leakage rate between first representative point, second representative point, δ
srepresent the observed temperature difference between first representative point, second representative point;
9) according to selecting one to sew leakage quantity output as in Automatic steam trap Trap to be detected final in the leakage rate three that between leakage rate corresponding to leakage rate corresponding to first representative point, second representative point and first representative point, second representative point, temperature gap is corresponding.
2. in the Automatic steam trap Trap detecting based on pipe surface temperature before valve according to claim 1, leak detection method, it is characterized in that, described step 9) implementation step is as follows: judge the leakage rate that first representative point is corresponding, second leakage rate and first representative point that representative point is corresponding, whether the leakage rate three that between second representative point, temperature gap is corresponding meets formula (15), if meet formula (15), from leakage rate corresponding to described first representative point, second leakage rate and first representative point that representative point is corresponding, in the leakage rate that between second representative point, temperature gap is corresponding, select arbitrarily one as in Automatic steam trap Trap to be detected final, to sew leakage quantity output, otherwise sew leakage quantity output in final using leakage rate corresponding to first representative point as Automatic steam trap Trap to be detected,
| G
11-G
12|/G
11≤ 1% and | G
11-G
13|/G
11≤ 1% (15)
In formula (15), G
11represent the leakage rate that first representative point is corresponding, G
12represent second leakage rate that representative point is corresponding, G
13represent leakage rate corresponding to temperature gap between first representative point, second representative point.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092157A (en) * | 2014-05-04 | 2015-11-25 | 湖南鸿远高压阀门有限公司 | Power plant thermodynamic system valve inner leakage diagnosis method and system |
| CN106017808A (en) * | 2016-07-19 | 2016-10-12 | 湖南鸿远高压阀门有限公司 | Method and system for diagnosing inner leakage amount of drain valve |
| CN107014573A (en) * | 2017-03-22 | 2017-08-04 | 中国计量大学 | PE ball valve Micro blazed-grating detecting systems and detection method |
| CN107063581A (en) * | 2017-06-01 | 2017-08-18 | 北京京能未来燃气热电有限公司 | Valves leakage detection means and detection method |
| CN107726036A (en) * | 2017-11-15 | 2018-02-23 | 广东溢达纺织有限公司 | Drain valve condition checkout gear, drainage mechanism and drain valve condition detection method |
| CN109580109A (en) * | 2018-12-20 | 2019-04-05 | 国网福建省电力有限公司 | A kind of method that soft straight converter valve tower cooler water leak monitors automatically |
| CN110375924A (en) * | 2019-08-06 | 2019-10-25 | 河南理工大学 | A kind of power plant valve leakage Quantitative Evaluation System |
| CN113324700A (en) * | 2021-05-10 | 2021-08-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Leakage fault detection system and method for drain valve |
| CN113409969A (en) * | 2021-02-05 | 2021-09-17 | 海南核电有限公司 | Nuclear power plant valve internal leakage fault diagnosis method |
| CN114077933A (en) * | 2022-01-13 | 2022-02-22 | 常州艾肯智造科技有限公司 | Real-time transmission system and method for steam on-line monitoring data |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040225458A1 (en) * | 2003-04-25 | 2004-11-11 | Sherikar Sanjay V. | Method of determining valve leakage based on upstream and downstream temperature measurements |
| CN101061303A (en) * | 2004-11-18 | 2007-10-24 | 罗伯特·博世有限公司 | Method and device for leak proofing a fuel injecting valve for an internal combustion engine |
| KR100894430B1 (en) * | 2008-11-11 | 2009-04-22 | 시스템디엔디(주) | Device and method for measuring fluid leakage rate of a valve using ultrasonic, acoustic and temperature detection system |
| CN102478445A (en) * | 2010-11-23 | 2012-05-30 | 华东电力试验研究院有限公司 | Method for detecting internal leakage of valve of thermodynamic system in power plant |
-
2013
- 2013-11-19 CN CN201310585097.2A patent/CN103557992B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040225458A1 (en) * | 2003-04-25 | 2004-11-11 | Sherikar Sanjay V. | Method of determining valve leakage based on upstream and downstream temperature measurements |
| CN101061303A (en) * | 2004-11-18 | 2007-10-24 | 罗伯特·博世有限公司 | Method and device for leak proofing a fuel injecting valve for an internal combustion engine |
| KR100894430B1 (en) * | 2008-11-11 | 2009-04-22 | 시스템디엔디(주) | Device and method for measuring fluid leakage rate of a valve using ultrasonic, acoustic and temperature detection system |
| CN102478445A (en) * | 2010-11-23 | 2012-05-30 | 华东电力试验研究院有限公司 | Method for detecting internal leakage of valve of thermodynamic system in power plant |
Non-Patent Citations (2)
| Title |
|---|
| 刘波等: "某型舰船阀门内漏温差检测法可行性研究", 《中国修船》 * |
| 袁振福等: "基于传热原理的电厂阀门泄漏量计算方法", 《动力工程》 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092157B (en) * | 2014-05-04 | 2017-08-08 | 湖南鸿远高压阀门有限公司 | A kind of internal leakage of valve of thermodynamic system in power plant diagnostic method and diagnostic system |
| CN105092157A (en) * | 2014-05-04 | 2015-11-25 | 湖南鸿远高压阀门有限公司 | Power plant thermodynamic system valve inner leakage diagnosis method and system |
| CN106017808B (en) * | 2016-07-19 | 2018-07-31 | 湖南鸿远高压阀门有限公司 | The diagnostic method of leakage quantity in drain valve |
| CN106017808A (en) * | 2016-07-19 | 2016-10-12 | 湖南鸿远高压阀门有限公司 | Method and system for diagnosing inner leakage amount of drain valve |
| CN107014573A (en) * | 2017-03-22 | 2017-08-04 | 中国计量大学 | PE ball valve Micro blazed-grating detecting systems and detection method |
| CN107063581A (en) * | 2017-06-01 | 2017-08-18 | 北京京能未来燃气热电有限公司 | Valves leakage detection means and detection method |
| CN107726036A (en) * | 2017-11-15 | 2018-02-23 | 广东溢达纺织有限公司 | Drain valve condition checkout gear, drainage mechanism and drain valve condition detection method |
| CN107726036B (en) * | 2017-11-15 | 2023-11-28 | 广东溢达纺织有限公司 | Drain valve state detection device, drain mechanism and drain valve state detection method |
| CN109580109A (en) * | 2018-12-20 | 2019-04-05 | 国网福建省电力有限公司 | A kind of method that soft straight converter valve tower cooler water leak monitors automatically |
| CN110375924A (en) * | 2019-08-06 | 2019-10-25 | 河南理工大学 | A kind of power plant valve leakage Quantitative Evaluation System |
| CN113409969A (en) * | 2021-02-05 | 2021-09-17 | 海南核电有限公司 | Nuclear power plant valve internal leakage fault diagnosis method |
| CN113409969B (en) * | 2021-02-05 | 2023-03-24 | 海南核电有限公司 | Nuclear power plant valve internal leakage fault diagnosis method |
| CN113324700A (en) * | 2021-05-10 | 2021-08-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Leakage fault detection system and method for drain valve |
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