CN104596657B - Device and method for monitoring inlet and outlet temperature of gas compressor - Google Patents
Device and method for monitoring inlet and outlet temperature of gas compressor Download PDFInfo
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Abstract
The invention relates to the technical field of temperature measurement of a gas compressor, and provides a device and a method for monitoring the temperature of an inlet and an outlet of the gas compressor. The inlet and outlet temperature monitoring device of the gas compressor obtains temperature values of a plurality of points through more than four temperature measuring sensors, and takes the average value of all temperature values except the maximum temperature value and the minimum temperature value as the output temperature, so that the inlet and outlet temperatures of the gas compressor are more accurate. In addition, the maximum temperature value, the minimum temperature value and the output average temperature value are compared, so that more reliable monitoring of the inlet and outlet temperature faults of the compressor is obtained. When the detection device is used for monitoring the temperature of the inlet and the outlet of the compressor of the heavy-duty gas turbine, the control performance of the whole heavy-duty gas turbine can be more accurate.
Description
Technical Field
The invention relates to the technical field of temperature measurement of a gas compressor, in particular to a device and a method for monitoring the inlet and outlet temperature of the gas compressor, and more particularly to a device and a method for monitoring the inlet and outlet temperature of the gas compressor, which are suitable for a heavy-duty gas turbine.
Background
The compressor is an important part of a heavy-duty gas turbine, and the inlet temperature and the outlet temperature of the compressor are taken as section parameters of the compressor, so that the performance of the compressor and even the control of the whole gas turbine are very important. For example, the actual rotating speed is corrected to the rotating speed under the standard condition by using the actual inlet temperature of the compressor, the fuel quantity entering a combustion chamber can be corrected, and the angle of an air inlet adjustable guide vane of the compressor is corrected by using the outlet temperature of the compressor. Therefore, it is very important to accurately process the measurement signals of the inlet temperature and the outlet temperature of the compressor.
There are two general methods for monitoring the inlet temperature and the outlet temperature of the compressor: the first one is to adopt two temperature measuring thermal resistance or thermocouple sensors, take the large value as the measured temperature, the corresponding sensor fault monitoring method is that the measured value difference of the two sensors exceeds a certain value, then the measured fault is considered to occur; the second one is to adopt three temperature measuring thermal resistors or thermocouple sensors, take the middle value as the measured temperature, and the corresponding sensor fault monitoring method is that the difference between the maximum value and the minimum value of the measurement exceeds a certain limit value, then the measurement fault is considered to occur.
Neither of the two methods of measuring compressor inlet and outlet temperatures described above is sufficiently accurate.
Further, in the first method, two sensors acquire two measuring points, and if a sensor which measures a larger value happens to be in a fault, the measurement signal is inaccurate. In the second method, three measuring points are taken through three sensors, so that the measuring structure is more accurate compared with that of the first method, but the finally output measuring value is not taken into account by the corresponding measuring fault monitoring scheme, so that the effectiveness of fault monitoring is reduced.
In view of the above, it is desirable to provide a device and a method for monitoring the inlet/outlet temperature of an air compressor, which can measure more accurately.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a device and a method for monitoring the temperature of an inlet and an outlet of a gas compressor, which are used for obtaining accurate measurement results.
(II) technical scheme
In order to solve the technical problem, the invention provides a device for monitoring the temperature of an inlet and an outlet of a gas compressor, which comprises more than four temperature sensors; the output ends of all the temperature measuring sensors are connected with the input ends of the maximum value selection module, the summation module and the minimum value selection module; the output ends of the maximum value selection module, the summation module and the minimum value selection module are all connected with the input end of the end value elimination module; the output end of the end value exclusion module is connected with the input end of the mean value module; the maximum value selection module and the average value module respectively input the maximum temperature value and the average temperature value into the first difference making module; the output end of the first difference making module is connected with the input end of the first temperature dispersion degree upper limit judging module; the minimum value selection module and the average value module respectively input the minimum temperature value and the average temperature value into a second difference making module; the output end of the second difference making module is connected with the input end of the second temperature dispersion degree upper limit judging module; the output ends of the first temperature dispersity and the second temperature dispersity upper limit judging module are connected with the input end of the OR gate; and the output end of the OR gate is connected with an obstacle indicator lamp.
The invention also provides a device for monitoring the temperature of the inlet and the outlet of the compressor, which comprises more than four temperature sensors; the output ends of all the temperature measuring sensors are connected with the input ends of the maximum value selection module, the summation module and the minimum value selection module; the maximum value selection module sends the maximum temperature value to the first display module; the minimum value selection module sends the minimum temperature value to a second display module; the output ends of the maximum value selection module, the summation module and the minimum value selection module are all connected with the input end of the end value elimination module; the output end of the end value exclusion module is connected with the input end of the average value module, and the output end of the average value module is connected with the third display module.
Preferably, the number of the temperature measuring sensors is four.
The invention also provides a method for monitoring the temperature of the inlet and the outlet of the gas compressor, which comprises the following steps:
s1: arranging N temperature measuring sensors at the inlet or the outlet of the compressor, measuring temperature signals of N points, and sending all the temperature signals to a maximum value selection module, a summation module and a minimum value selection module, wherein N is more than or equal to 4;
s2: the maximum value selection module obtains a maximum temperature value through calculation and sends the maximum temperature value to the first display module; the summation module calculates the sum of all temperature values; the minimum value selection module obtains a minimum temperature value through calculation and sends the minimum temperature value to the second display module;
s3: the maximum value selection module, the summation module and the minimum value selection module respectively send the maximum temperature value, the sum of all temperature values and the minimum temperature value to the end value exclusion module, and the end value exclusion module calculates the sum of all temperature values except the maximum temperature value and the minimum temperature value;
s4: sending the sum of all temperature values finally obtained in the step S3 to a mean value module, wherein the mean value module obtains a mean temperature value and sends the mean temperature value to a third display module; the method for acquiring the average temperature value in the average module comprises the following steps: the sum of all temperature values finally obtained in S3 is divided by (N-2) to obtain an average temperature value.
Preferably, after the S4, further comprising S5: comparing the maximum temperature value and the minimum temperature value obtained in the step S2 with the average temperature value obtained in the step S4; and if at least one of the difference between the maximum temperature value and the average temperature value and the difference between the minimum temperature value and the average temperature value is larger than the upper limit value of the temperature dispersion degree, judging that the inlet and outlet temperature monitoring device of the gas compressor has a measurement fault.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the inlet and outlet temperature monitoring device of the gas compressor obtains temperature values of a plurality of points through more than four temperature measuring sensors, and takes the average value of all temperature values except the maximum temperature value and the minimum temperature value as the output temperature, so that the inlet and outlet temperatures of the gas compressor are more accurate.
On the basis, the maximum temperature value, the minimum temperature value and the output average temperature value are compared, so that more reliable monitoring of the inlet and outlet temperature faults of the compressor is obtained. When the detection device is used for monitoring the temperature of the inlet and the outlet of the compressor of the heavy-duty gas turbine, the control performance of the whole heavy-duty gas turbine can be more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a compressor inlet and outlet temperature monitoring device according to the present invention;
FIG. 2 is a schematic diagram illustrating the principle of determining whether the temperature monitoring device for the inlet and outlet of the compressor of the present invention has a measurement fault;
in the figure: 1. a temperature measuring sensor; 2. a maximum value selection module; 3. a summing module; 4. a minimum value selection module; 5. a first display module; 6. a second display module; 7. an endpoint exclusion module; 8. a mean value module; 9. a third display module; 10. a first difference making module; 11. a second difference making module; 12. a first temperature dispersion degree upper limit judging module; 13. a second temperature dispersion degree upper limit judging module; 14. or a door.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The device for monitoring the temperature of the inlet and the outlet of the compressor is suitable for the condition that four or more temperature measuring sensors measure the temperature, and the condition that the number of the temperature measuring sensors 1 is four is only explained; it should be understood that the number of the temperature measuring sensors 1 in the compressor inlet and outlet temperature monitoring device of the embodiment may also be five or six … …. In addition, in the method for monitoring the temperature of the inlet and the outlet of the compressor in the embodiment, the method for monitoring the temperature of the inlet of the compressor is the same as the method for monitoring the temperature of the outlet of the compressor, and the only difference is the set value of the upper limit of the temperature dispersion degree. Therefore, the implementation of the present invention is representatively illustrated as a method for monitoring the compressor inlet temperature.
Example one
The device for monitoring the temperature of the inlet and the outlet of the compressor in the first embodiment comprises four temperature measurement sensors 1, a maximum value selection module 2, a summation module 3, a minimum value selection module 4 and a mean value module 8, and is specifically referred to fig. 1. The four temperature sensors 1 send temperature signals to a maximum value selection module 2, a summation module 3 and a minimum value selection module 4; wherein, the maximum value selection module 2 calculates and obtains the maximum temperature value T
MAXAnd the maximum temperature value T is measured
MAXSending to the first display module 5; the summation module 3 calculates the sum of all temperature values; the minimum value selection module 4 calculates the minimum temperature value T through calculation
MINAnd a minimum temperature value T is set
MINTo the second display module 6. Then, the maximum value selection module 2, the summation module 3 and the minimum value selection module 4 respectively select the maximum valueTemperature value T
MAXSum of all temperature values, minimum temperature value T
MINTo the end value exclusion module 7. The end value exclusion module 7 subtracts the maximum temperature value T from the sum of all temperature values
MAXAnd a minimum temperature value T
MINAnd the sum of two intermediate temperature values measured by the four temperature sensors 1 is obtained. The end value exclusion module 7 sends the sum of the two intermediate temperature values to the average module 8, the average module 8 calculates the average temperature value T of the two intermediate temperature values, and the average temperature value T is displayed through the third display module 9. It is to be noted herein that the average temperature value T is an average value of other measured temperatures excluding the maximum temperature value and the minimum temperature value; if the number of temperature sensors 1 is N (N ≧ 4), the average temperature value T in the averaging module 8 is equal to the sum of the temperature values thereof excluding the maximum temperature value and the minimum temperature value divided by (N-2).
The values of the first display module 5, the second display module 6 and the third display module 9 are compared artificially, so that whether the measurement fault occurs in the current judgment can be judged. The inlet and outlet temperature monitoring device of the embodiment I is used for the compressor of the heavy-duty gas turbine, signals of the temperature measuring sensors 1 at the inlet and outlet of the compressor are processed in the monitoring process, and the maximum temperature value T is removed
MAXAnd a minimum temperature value T
MINAnd then, averaging the intermediate temperature values to obtain more accurate measured values of the inlet and outlet temperatures of the compressor.
Example two
The gas compressor inlet and outlet temperature monitoring device of the second embodiment has a function of measuring faults and automatically monitoring the faults. Compared with the apparatus of the first embodiment, the apparatus of the second embodiment may, but need not, include the first display module 5, the second display module 6, and the third display module 9. In addition, the maximum value selection module 2 and the average value module 8 are both connected to the input end of the first difference making module 10, so as to respectively set the maximum temperature value T
MAXThe average temperature value T is input into a first differential module 10; the first difference making module 10 calculates the maximum temperature value T
MAXAnd the average temperature value T. The output end of the first difference making module 10 is connected with the upper limit judgment module 12 of the first temperature dispersion degreeAt the input end, the first upper limit temperature dispersity judging module 12 compares the difference obtained by the first difference making module 10 with the upper limit temperature dispersity. The minimum value selection module 4 and the average value module 8 are both connected with the second difference making module 11, so that the minimum temperature value T is respectively set
MINAnd the average temperature value T is input into the second differential module 11. The output end of the second difference making module 11 is connected to the input end of the second temperature dispersion degree upper limit judging module 13, and the second temperature dispersion degree upper limit judging module 13 compares the difference obtained by the second difference making module 11 with the temperature dispersion degree upper limit. The output ends of the first temperature dispersity and the second temperature dispersity upper limit judging module are connected with an OR gate 14, and the OR gate 14 is connected with an alarm switch. If the maximum temperature value T
MAXAnd the difference between the average temperature value T, and a minimum temperature value T
MINAnd if at least one difference between the average temperature value T and the average temperature value T is greater than the upper limit value of the temperature dispersion degree, namely at least one of the two conditions is met, the fact that the temperature monitoring device for the inlet and the outlet of the gas compressor has a measurement fault is judged, and the AND gate 14 triggers an alarm switch to give an alarm.
The gas compressor inlet and outlet temperature monitoring device of the second embodiment can timely and effectively find out measurement faults, so that relatively accurate reference is provided for the control of the whole heavy-duty gas turbine.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (5)
1. A device for monitoring the temperature of an inlet and an outlet of a compressor is arranged at the inlet or the outlet of the compressor and is characterized by comprising more than four temperature sensors; the output ends of all the temperature measuring sensors are connected with the input ends of the maximum value selection module, the summation module and the minimum value selection module; the output ends of the maximum value selection module, the summation module and the minimum value selection module are all connected with the input end of the end value elimination module; the output end of the end value exclusion module is connected with the input end of the mean value module; the maximum value selection module and the average value module respectively input the maximum temperature value and the average temperature value into the first difference making module; the output end of the first difference making module is connected with the input end of the first temperature dispersion degree upper limit judging module; the minimum value selection module and the average value module respectively input the minimum temperature value and the average temperature value into a second difference making module; the output end of the second difference making module is connected with the input end of the second temperature dispersion degree upper limit judging module; the output ends of the first temperature dispersity and the second temperature dispersity upper limit judging module are connected with the input end of the OR gate; and the output end of the OR gate is connected with an alarm switch.
2. The compressor inlet-outlet temperature monitoring device as claimed in claim 1, wherein the number of the temperature measuring sensors is four.
3. A device for monitoring the temperature of an inlet and an outlet of a compressor is arranged at the inlet or the outlet of the compressor and is characterized by comprising more than four temperature sensors; the output ends of all the temperature measuring sensors are connected with the input ends of the maximum value selection module, the summation module and the minimum value selection module; the maximum value selection module sends the maximum temperature value to the first display module; the minimum value selection module sends the minimum temperature value to a second display module; the output ends of the maximum value selection module, the summation module and the minimum value selection module are all connected with the input end of the end value elimination module; the output end of the end value exclusion module is connected with the input end of the average module, and the output end of the average module is connected with the third display module; the maximum value selection module and the average value module respectively input the maximum temperature value and the average temperature value into the first difference making module; the output end of the first difference making module is connected with the input end of the first temperature dispersion degree upper limit judging module; the minimum value selection module and the average value module respectively input the minimum temperature value and the average temperature value into a second difference making module; the output end of the second difference making module is connected with the input end of the second temperature dispersion degree upper limit judging module; the output ends of the first temperature dispersity and the second temperature dispersity upper limit judging module are connected with the input end of the OR gate; and the output end of the OR gate is connected with an alarm switch.
4. The compressor inlet-outlet temperature monitoring device as claimed in claim 3, wherein the number of the temperature measuring sensors is four.
5. A method for monitoring the temperature of an inlet and an outlet of a compressor is characterized by comprising the following steps:
s1: arranging N temperature measuring sensors at the inlet or the outlet of the compressor, measuring temperature signals of N points, and sending all the temperature signals to a maximum value selection module, a summation module and a minimum value selection module, wherein N is more than or equal to 4;
s2: the maximum value selection module obtains a maximum temperature value through calculation and sends the maximum temperature value to the first display module; the summation module calculates the sum of all temperature values; the minimum value selection module obtains a minimum temperature value through calculation and sends the minimum temperature value to the second display module;
s3: the maximum value selection module, the summation module and the minimum value selection module respectively send the maximum temperature value, the sum of all temperature values and the minimum temperature value to the end value exclusion module, and the end value exclusion module calculates the sum of all temperature values except the maximum temperature value and the minimum temperature value;
s4: sending the sum of all temperature values finally obtained in the step S3 to a mean value module, wherein the mean value module obtains a mean temperature value and sends the mean temperature value to a third display module; the method for acquiring the average temperature value in the average module comprises the following steps: dividing the sum of all temperature values finally obtained in S3 by (N-2) to obtain an average temperature value;
after the S4, further comprising S5: comparing the maximum temperature value and the minimum temperature value obtained in the step S2 with the average temperature value obtained in the step S4; and if at least one of the difference between the maximum temperature value and the average temperature value and the difference between the minimum temperature value and the average temperature value is larger than the upper limit value of the temperature dispersion degree, judging that the inlet and outlet temperature monitoring device of the gas compressor has a measurement fault.
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| CN108760083A (en) * | 2018-07-03 | 2018-11-06 | 汉能移动能源控股集团有限公司 | Working temperature detection method and system and abnormity early warning and system of solar module |
| CN109556876B (en) * | 2018-11-07 | 2020-09-04 | 国网浙江省电力有限公司电力科学研究院 | Diagnosis method for distinguishing combustion fault of gas turbine and fault of hot channel equipment |
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