CN111781304A - Calibration method of natural gas on-line water dew point instrument - Google Patents
Calibration method of natural gas on-line water dew point instrument Download PDFInfo
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- CN111781304A CN111781304A CN202010651855.6A CN202010651855A CN111781304A CN 111781304 A CN111781304 A CN 111781304A CN 202010651855 A CN202010651855 A CN 202010651855A CN 111781304 A CN111781304 A CN 111781304A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 404
- 239000003345 natural gas Substances 0.000 title claims abstract description 202
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 65
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000012937 correction Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000004164 analytical calibration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
- G01N2033/0072—Arrangements to check the analyser by generating a test gas
Abstract
The application discloses a method for calibrating a natural gas online water dew point instrument, which comprises the following steps: selecting a reference dew point temperature of standard gas, and detecting and acquiring a display dew point temperature of the standard gas, wherein the display dew point temperature corresponds to the reference dew point temperature; calibrating the indication error of the natural gas on-line water dew point instrument according to the reference dew point temperature and the display dew point temperature; calibrating the measurement repeatability of the natural gas online water dew point instrument according to the reference dew point temperature and the display dew point temperature; and calibrating the alarm performance of the natural gas on-line water dew point instrument according to the reference dew point temperature. According to the calibration method, the reference dew point temperature of the standard gas is selected, and the display temperature corresponding to the reference dew point temperature is obtained, so that the indication error and the measurement repeatability of the natural gas online water dew point instrument are calibrated; and calibrating the alarm performance according to the reference dew point temperature, so that various performances of the natural gas online water dew point instrument can be calibrated more accurately.
Description
Technical Field
The application relates to the technical field of water dew point instrument calibration, in particular to a calibration method of a natural gas online water dew point instrument.
Background
The water dew point is a key physical parameter of the natural gas, and if the water dew point exceeds the standard in the natural gas pipeline transportation, ice blockage can be caused, and meanwhile, hydrogen sulfide in the natural gas can be dissolved in condensed water to generate stronger corrosivity, so that a series of serious damages are caused to a gas pipeline and equipment; therefore, natural gas treatment plants and gas transmission stations are often equipped with on-line natural gas water dew point meters to monitor the water dew point in natural gas in real time.
However, at present, there is no accurate and comprehensive calibration method for the natural gas online water dew point meter, and the accuracy of the monitoring performance of the natural gas online water dew point meter cannot be ensured.
Disclosure of Invention
In view of this, the embodiment of the present application provides a calibration method for a natural gas online water dew point meter, and mainly aims to solve the problem that there is no accurate and comprehensive calibration method for a natural gas online water dew point meter at present, and thus the accuracy of monitoring performance of the natural gas online water dew point meter cannot be guaranteed.
In order to achieve the above purpose, the present application mainly provides the following technical solutions:
the embodiment of the application provides a calibration method of a natural gas online water dew point instrument, which comprises the following steps
Selecting a reference dew point temperature of standard gas, and detecting and acquiring a display dew point temperature of the standard gas, wherein the display dew point temperature corresponds to the reference dew point temperature;
calibrating the indication error of the natural gas online water dew point instrument according to the reference dew point temperature and the display dew point temperature;
calibrating the measurement repeatability of the natural gas online water dew point instrument according to the reference dew point temperature and the display dew point temperature;
and calibrating the alarm performance of the natural gas online water dew point instrument according to the reference dew point temperature.
Optionally, in the method for calibrating the online natural gas water dew point instrument, the step of calibrating the indication error of the online natural gas water dew point instrument according to the reference dew point temperature and the displayed dew point temperature specifically includes:
calculating a correction value of the indication value error of the natural gas on-line water dew point instrument by using a formula (1) according to a plurality of reference dew point temperatures of the standard gas and a plurality of display dew point temperatures corresponding to the reference dew point temperatures one by one,
ΔT＝max(Ti-T0) (1)
in the formula: delta T is a corrected value of the indication value error of the natural gas on-line water dew point instrument, and is DEG C;
Tiis one of the plurality of reference dew point temperatures, deg.C;
T0for one of the plurality of displayed dew point temperatures, DEG C.
Optionally, in the method for calibrating an online natural gas water dew point instrument, the step of calibrating the repeatability of the online natural gas water dew point instrument according to the reference dew point temperature and the displayed dew point temperature specifically includes:
aiming at the preset reference dew point temperature of the standard gas, within the first preset time, obtaining a group of display dew point temperatures every second preset time, after obtaining n groups of display dew point temperatures,
the measurement repeatability of the natural gas on-line water dew point meter is calculated by using the formula (2),
in the formula: snMeasuring repeatability of the natural gas on-line water dew point meter;
Tithe display dew point temperature of the natural gas on-line water dew point instrument at the ith measurement is DEG C;
n is an integral multiple of the first preset time relative to the second preset time.
Optionally, in the calibration method for the natural gas online water dew point meter, the first preset time is 10 min;
the second preset time is 1 min;
and n is 10.
Optionally, in the calibration method for the online natural gas water dew point meter, the step of calibrating the alarm performance of the online natural gas water dew point meter according to the reference dew point temperature includes:
calibrating the alarm function of the natural gas on-line water dew point instrument according to the reference dew point temperature, and
and calibrating the alarm response time of the natural gas online water dew point instrument according to the reference dew point temperature.
Optionally, the calibration method of the on-line natural gas water dew point instrument further includes a stop valve;
the stop valve is arranged between the reversing valve and the piston assembly, and the step of calibrating the alarm function of the natural gas online water dew point instrument according to the reference dew point temperature specifically comprises the following steps:
selecting the reference dew point temperature as an alarm dew point temperature of the natural gas online water dew point instrument;
checking an alarm condition;
and if the natural gas online water dew point meter gives an alarm, the alarm function of the natural gas online water dew point meter is normal.
Optionally, in the method for calibrating a natural gas online water dew point meter, if the natural gas online water dew point meter alarms, the alarm function of the natural gas online water dew point meter is normal, and then the method further includes:
adjusting the reference dew point temperature to 80% or 50% of the alarm dew point temperature;
checking an alarm condition;
and if the natural gas online water dew point meter gives an alarm, the alarm function of the natural gas online water dew point meter is normal.
Optionally, in the method for calibrating the online natural gas water dew point instrument, the step of calibrating the alarm response time of the online natural gas water dew point instrument according to the reference dew point temperature specifically includes:
selecting the reference dew point temperature as an alarm dew point temperature of the natural gas online water dew point instrument;
calculating the alarm response time of the natural gas on-line water dew point instrument according to a formula (3),
Δt＝|t1-t2| (3)
in the formula: delta T is the alarm response time s of the natural gas on-line water dew point instrument;
t1the time for inputting the standard gas into the natural gas on-line water dew point instrument is started;
t2and the time for the natural gas on-line water dew point meter to start alarming.
Optionally, in the calibration method of the on-line natural gas water dew point instrument, the step of selecting the reference dew point temperature of the standard gas, and detecting and acquiring the displayed dew point temperature of the standard gas further includes
The device is sequentially connected with a standard humidity generator, an output air pump and a natural gas online water dew point instrument;
and adjusting the standard gas pressure input into the natural gas online water dew point instrument by the output gas pump to meet the working requirement of the natural gas online water dew point instrument.
Optionally, the calibration method of the natural gas on-line water dew point instrument, wherein the reference dew point temperature is in a range of-100 ℃ to 20 ℃.
The calibration method for the natural gas online water dew point instrument provided by the embodiment of the application has at least the following beneficial effects: the calibration method of the natural gas online water dew point instrument comprises the steps of taking standard gas as calibration for calibration reference, selecting reference dew point temperature of the standard gas, and obtaining display temperature corresponding to the reference dew point temperature, so that indication error of the natural gas online water dew point instrument and measurement repeatability of the natural gas online water dew point instrument are calibrated; the alarm performance of the natural gas on-line water dew point instrument can be calibrated according to the reference dew point temperature, so that various performances of the natural gas on-line water dew point instrument can be accurately calibrated, and the accuracy of the subsequent monitoring performance is improved.
Drawings
Fig. 1 is a schematic flow chart of a calibration method for a natural gas online water dew point meter according to an embodiment of the present application;
fig. 2 is a schematic flow chart illustrating a process of calibrating an indication error of a natural gas online water dew point meter in a calibration method of the natural gas online water dew point meter according to an embodiment of the present application;
fig. 3 is a schematic flow chart illustrating measurement repeatability of a natural gas online water dew point meter calibrated in a calibration method of the natural gas online water dew point meter according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart illustrating the process of calibrating the alarm performance of the natural gas online water dew point meter in the calibration method of the natural gas online water dew point meter according to the embodiment of the present application;
fig. 5 is a trend diagram of a standard gas in a calibration method of a natural gas online water dew point instrument according to an embodiment of the present application;
in the figure: a standard humidity generator 1, an output air pump 2 and a natural gas on-line water dew point instrument 3.
Detailed Description
To further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the following detailed description is provided for the specific implementation, structure, features and effects of the calibration method for the on-line natural gas dew point instrument according to the present application with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Example 1
Referring to fig. 1, an embodiment of the present application provides a calibration method for a natural gas online water dew point meter, which includes the following steps:
101. selecting a reference dew point temperature of standard gas, and detecting and acquiring a display dew point temperature of the standard gas;
referring to fig. 5, a standard humidity generator 1, an output air pump 2 and a natural gas online water dew point meter 3 are sequentially connected, a reference dew point temperature of the standard gas is selected in the standard humidity generator 1, and the reference dew point temperature is the standard dew point temperature of the standard gas and is used as a reference in this embodiment; inputting the standard gas with the reference dew point temperature selected and output by the standard humidity generator 1 into the natural gas online water dew point instrument 3 by using the output gas pump 2, and testing the dew point temperature of the standard gas (the standard gas with the reference dew point temperature selected) and the indication value of the natural gas online water dew point instrument 3 is the display dew point temperature;
the standard humidity generator 1, the output air pump 2 and the natural gas online water dew point instrument 3 are all devices in the prior art, the specific structure and the working principle of the devices can be easily understood by those skilled in the art, and meanwhile, the structure and the working principle of the devices are not the protection key points of the scheme, so that the details are not repeated herein;
when standard gas is transmitted by the output gas pump 2, the standard gas pressure input by the output gas pump 2 to the natural gas online water dew point meter 3 needs to be adjusted to meet the working requirement of the natural gas online water dew point meter 3, for example: 1-3 Mpa;
a gas storage device is arranged between the standard humidity generator 1 and the output gas pump 2, and is capable of storing the standard gas (the standard gas with the selected reference dew point temperature) output by the standard humidity generator 1, waiting for transmission by the output gas pump 2, so as to provide guarantee for subsequent utilization of the standard gas (the standard gas with the selected reference dew point temperature) at irregular time and improve the transmission efficiency of the whole gas transmission system; the setting mode can be easily understood and easily implemented by those skilled in the art, and the setting mode is not a protection key point of the scheme, and thus is not described herein in detail.
102. Calibrating the indication error of the natural gas online water dew point instrument 3 according to the reference dew point temperature and the display dew point temperature;
in this embodiment, the reference dew point temperature is a reference dew point temperature of the standard gas, and the reference dew point temperature is a standard dew point temperature of the standard gas, and is used as a reference in this embodiment; the displayed dew point temperature is an indication value of the natural gas online water dew point meter, and then the indication value difference of the natural gas online water dew point meter needs to perform difference calculation on the reference dew point temperature and the displayed dew point temperature, further, a group of difference values can be obtained, and also multiple groups of difference values can be obtained, preferably, in order to ensure that the difference data has general applicability, multiple groups of difference values are obtained in this embodiment, and the detailed calibration step refers to the following detailed description and the attached drawing 2, and is not described in detail herein.
103, calibrating the measurement repeatability of the natural gas online water dew point instrument 3 according to the reference dew point temperature and the display dew point temperature;
the repeatability is that the maximum difference of two horizontal independent test results under 95% probability represents the stability and reliability of the test results of the equipment according to a plurality of single test results of the same sample in a short period of time by the operation of the same operator under the same test condition of the same instrument.
In this embodiment, a certain reference dew point temperature is selected in the standard humidity generator 1, a display temperature corresponding to the reference point temperature is obtained through the natural gas online water dew point meter 3, and the test condition (including the selected reference dew point temperature of the standard gas, the output gas pressure of the output gas pump 2, the operating environment temperature, and the like) is kept unchanged, after the indication value of the natural gas online water dew point meter 3 is stable (the stability here is determined according to experience, for example, when the indication value of the natural gas online water dew point meter 3 is accurate to tenth, the change difference of tenth of the indication value of the natural gas online water dew point meter 3 is small and the change frequency is low, or only the last tenth or percentile of the indication value is slightly changed), the measurement repeatability of the natural gas online water dew point meter 3 within a preset time is tested, the lower the repeatability, the more stable and reliable the test result of the natural gas online water dew point meter 3, and on the contrary, the higher the repeatability, the more unstable and unreliable the test result of the natural gas online water dew point meter 3; please refer to the following detailed description and fig. 3 for a detailed calibration procedure, which is not described herein.
104. Calibrating the alarm performance of the natural gas online water dew point instrument 3 according to the reference dew point temperature;
the alarm performance of the natural gas on-line water dew point instrument 3 comprises the alarm function and the alarm response time; the alarm function indicates whether the natural gas on-line water dew point instrument 3 has the alarm function and can give an alarm; the alarm response time of the natural gas on-line water dew point instrument 3 is a parameter for judging the alarm sensitivity of the natural gas on-line water dew point instrument 3.
Before the on-line natural gas water dew point instrument 3 leaves a factory, an alarm dew point temperature is set according to the use environment, and when the water dew point of the test gas of the on-line natural gas water dew point instrument 3 reaches the alarm dew point temperature, the on-line natural gas water dew point instrument 3 gives an alarm to avoid the problems of ice blockage and the like in the process of conveying the gas in a pipeline.
In this embodiment, the reference dew point is selected to be consistent with the alarm dew point temperature, so as to calibrate the alarm function and the alarm corresponding time of the natural gas online water dew point instrument 3; for the detailed calibration step, please refer to the following detailed description and fig. 4, which will not be described in detail herein.
According to the method for calibrating the natural gas online water dew point instrument, the standard gas is used as calibration for calibration reference, the reference dew point temperature of the standard gas is selected, and the indication error of the natural gas online water dew point instrument and the measurement repeatability of the natural gas online water dew point instrument are calibrated by acquiring the display temperature corresponding to the reference dew point temperature; the alarm performance of the natural gas on-line water dew point instrument can be calibrated according to the reference dew point temperature, so that various performances of the natural gas on-line water dew point instrument can be accurately calibrated, and the accuracy of the subsequent monitoring performance is improved.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: a and B can be contained simultaneously, A can exist independently, B can exist independently, and any one of the three conditions can be met; wherein the inside and the outside are referred to the inside and the outside in actual installation.
Further, in the method for calibrating the on-line natural gas water dew point instrument provided by the embodiment of the present application, in a specific implementation, the step of calibrating the indication error of the on-line natural gas water dew point instrument 3 according to the reference dew point temperature and the display dew point temperature is specifically implemented as
Calculating a correction value of the indication value error of the natural gas on-line water dew point instrument by using a formula (1) according to a plurality of reference dew point temperatures of the standard gas and a plurality of display dew point temperatures corresponding to the reference dew point temperatures one by one,
ΔT＝max(Ti-T0) (1)
in the formula: delta T is a corrected value of the indication value error of the natural gas on-line water dew point instrument, and is DEG C;
Tiis one of the plurality of reference dew point temperatures, deg.C;
T0for one of the plurality of displayed dew point temperatures, DEG C.
Specifically, referring to fig. 2 and the contents of the above steps 101-102, the method specifically includes the following steps:
201. selecting multiple reference dew point temperatures T of standard gasiDetecting and acquiring the reference dew point temperatures T of the standard gasiOne-to-one display dew point temperature T0；
Multiple reference dew point temperatures TiIs selected and displays the dew point temperature T0The obtaining method in step (101) refers to the description in step (101), and thus is not described herein; for example: at least three temperature values are selected as reference dew point temperature T within the temperature range of-100 ℃ to 20 DEG C1、T2And T3And obtaining each reference dew point temperature T1、T2And T3Respectively corresponding display dew point temperature T10、T20And T30。
Wherein the temperature range of-100 ℃ to 20 ℃ is the working range of the natural gas on-line water dew point instrument 3, which can be easily understood by the skilled person and is not described herein; meanwhile, the reference dew point temperature and the data group number for displaying the dew point temperature which are selected in the temperature range can be selected according to actual calibration requirements, and in order to ensure the accuracy and the representativeness of the data and have universal applicability, at least three groups of data are selected in the embodiment, which can be understood as follows: it is also within the scope of the present application that more data sets may be selected based on actual calibration requirements.
202. Calculating a corrected value of the indication value error of the natural gas online water dew point instrument by using a formula (1);
the reference dew point temperature T is measured1、T2And T3Showing the dew point temperature T10、T20And T30Respectively substituting into a formula (1), respectively solving the difference values delta T1, delta T2 and delta T3 of the three groups of data by using the formula (1), wherein the delta T selects the maximum value of delta T1, delta T2 and delta T3, so as to ensure the universal applicability of the data; for example: when the delta T is a positive number, in the subsequent test, the accurate dew point temperature can be obtained only after the indication value of the natural gas on-line water dew point instrument 3 is reduced by delta T; if the delta T is a negative number, in the subsequent test, the accurate dew point temperature can be obtained only after the delta T is added to the indication value of the natural gas on-line water dew point instrument 3.
Further, in a specific implementation of the method for calibrating the on-line natural gas water dew point instrument according to the embodiment of the present application, the step of calibrating the repeatability of the on-line natural gas water dew point instrument 3 according to the reference dew point temperature and the display dew point temperature specifically includes:
aiming at the preset reference dew point temperature of the standard gas, within the first preset time, obtaining a group of display dew point temperatures every second preset time, after obtaining n groups of display dew point temperatures,
the measurement repeatability of the natural gas on-line water dew point meter is calculated by using the formula (2),
in the formula: snMeasuring repeatability of the natural gas on-line water dew point meter;
Tithe display dew point temperature of the natural gas on-line water dew point instrument at the ith measurement is DEG C;
n is an integral multiple of the first preset time relative to the second preset time.
Specifically, referring to fig. 3 and the contents of the above steps 101-103, the method specifically includes the following steps:
301. selecting a preset reference dew point temperature T of a standard gas, detecting and acquiring a display dew point temperature T corresponding to the preset reference dew point temperature T of the standard gasi；
Selection and display of the preset reference dew point temperature TiThe obtaining method in step (101) refers to the description in step (101), and thus is not described herein; for example: selecting T-30 ℃ in the temperature range of-100-20 ℃ as the preset reference dew point temperature T, and acquiring the display dew point temperature T corresponding to the reference dew point temperature Ti。
302. Waiting for the display of the dew point temperature TiAfter the display is stable, within a first preset time, acquiring a group of display dew point temperatures T at intervals of a second preset timeiObtaining n groups of display dew point temperatures;
the stability here may be determined empirically, for example: the indication value of the natural gas on-line water dew point instrument 3 is the display dew point temperature TiWhen the accuracy is reached to the tenth position, when the variation difference of the tenth position in the indication value of the natural gas online water dew point instrument 3 is small and the variation frequency is low, the indication value is stable or the tenth position is slightly changed; since the repeatability is representative of a shortThe stability and reliability of the data detected by the device within a certain time period, therefore, a repetitive calibration within a predetermined first time period is required, for example: the first preset time is set to be 10min, the second preset time is set to be 1min, and the dew point temperature T is read and sequentially displayed every 1min within 10miniAnd 10(n is 10) groups of display dew point temperatures T can be obtained within 10miniThe data value of (a); it can be understood that: the selection of the first preset time, the second preset time and the data selection group number n can be adjusted according to actual calibration requirements, and the data acquisition by applying the above method all belong to the protection range of the application, so that the selection is not limited too much;
303. calculating the measurement repeatability of the natural gas online water dew point meter by using a formula (2);
displaying the dew point temperature T of the 10 groups obtained in the step 302iThe data value is substituted into the formula (2), 10 groups of display dew point temperature T are firstly obtainediIs an arithmetic mean of
Reuse of the representation of the repeatability Sn(ii) a The lower the repeatability, the more stable and reliable the test result of the natural gas online water dew point meter 3, and conversely, the higher the repeatability, the more unstable and unreliable the test result of the natural gas online water dew point meter 3.
Further, in a specific implementation of the method for calibrating the online natural gas water dew point meter according to the embodiment of the present application, the step of calibrating the alarm performance of the online natural gas water dew point meter 3 according to the reference dew point temperature includes:
calibrating the alarm function of the natural gas on-line water dew point instrument 3 according to the reference dew point temperature, and
and calibrating the alarm response time of the natural gas online water dew point instrument 3 according to the reference dew point temperature.
Specifically, referring to fig. 4 and the contents of steps 101-104, the alarm performance of the online natural gas dew point instrument 3 includes an alarm function and an alarm response time, and specifically includes the following steps:
401. selecting the reference dew point temperature as the alarm dew point temperature of the natural gas online water dew point instrument 3;
the on-line natural gas water dew point instrument 3 has set an alarm dew point temperature according to the application environment before leaving the factory, in this embodiment, a reference dew point temperature is selected in the standard humidity generator 1 to be equal to the alarm dew point temperature of the on-line natural gas water dew point instrument 3, and the standard gas is input to the on-line natural gas water dew point instrument 3.
402. Checking an alarm condition;
if the natural gas online water dew point meter 3 gives an alarm, the alarm function of the natural gas online water dew point meter 3 is normal, and the natural gas online water dew point meter 3 can be normally used in the aspect of the alarm function.
Further, during the operation of the steps 401-402, the calibration of the alarm response time of the natural gas online water dew point instrument 3 may also be performed at the same time, specifically:
step 401 specifically includes: selecting the reference dew point temperature as the alarm dew point temperature of the natural gas online water dew point instrument 3, timing when the standard gas is input into the natural gas online water dew point instrument 3, wherein the time is t1；
Step 402 specifically includes: checking the alarm condition, finishing timing when the natural gas online water dew point meter 3 gives an alarm, wherein the time at the moment is t2；
Step 403 is executed subsequently, the alarm response time of the natural gas on-line water dew point instrument is calculated according to the formula (3),
Δt＝|t1-t2| (3)
in the formula: delta T is the alarm response time s of the natural gas on-line water dew point instrument;
t1the time for inputting the standard gas into the natural gas on-line water dew point instrument is started;
t2the time for starting alarming of the natural gas online water dew point meter is obtained;
specifically, the method comprises the following steps: the steps 401 and stepsT in step 4021And t2Substituting the formula (3) to obtain an absolute value of a difference value of the two values as an alarm response time delta T of the natural gas online water dew point instrument 3, wherein the larger the delta T is, the longer the alarm response time of the natural gas online water dew point instrument 3 is, and the lower the sensitivity is; the smaller the delta T is, the shorter the alarm response time of the natural gas online water dew point instrument 3 is, the higher the sensitivity is, and a reference basis can be provided for subsequent use.
Further, in order to ensure the integrity of the calibration of the alarm function of the natural gas online water dew point meter 3 and provide a reliable evaluation for the calibration of the alarm function thereof, in this embodiment, after step 402 or 403, the following steps are further included:
404. adjusting the reference dew point temperature to 80% or 50% of the alarm dew point temperature;
on the basis of the step 401, respectively selecting reference dew point temperatures equal to 80% and 50% of the alarm dew point temperature of the natural gas online water dew point instrument 3 in the standard humidity generator 1 as temporary alarm dew point temperatures of the natural gas online water dew point instrument 3, inputting the standard gas into the natural gas online water dew point instrument 3, and performing two calibration tests; a plurality of reference dew point temperatures are respectively selected from the standard humidity generator 1 as temporary alarm dew point temperatures of the natural gas online water dew point instrument 3, so as to more perfectly calibrate whether the alarm function of the natural gas online water dew point instrument 3 is normal or not, which can be understood by those skilled in the art and is not described herein; the values of a plurality of reference dew point temperatures respectively selected from the standard humidity generator 1 as the temporary alarm dew point temperature of the natural gas online water dew point instrument 3 can be adjusted according to actual calibration requirements, and are not described herein in any more detail, and the values of the plurality of reference dew point temperatures respectively selected from the standard humidity generator 1 as the temporary alarm dew point temperature of the natural gas online water dew point instrument 3 can be adjusted according to actual calibration requirements and are not important points to be protected in the present application, the values of the plurality of reference dew point temperatures respectively selected from the standard humidity generator 1 as the temporary alarm dew point temperature of the natural gas online water dew point instrument 3 are used for the calibration test of the alarm function of the natural gas online water dew point instrument 3.
405. Checking an alarm condition;
if the natural gas online water dew point meter 3 gives an alarm, the alarm function of the natural gas online water dew point meter 3 is normal, and the natural gas online water dew point meter 3 can be normally used in the aspect of the alarm function.
The foregoing is a preferred embodiment of the present application, which is not intended to be limiting in any way, and any simple modifications, equivalent variations and modifications made to the foregoing embodiment according to the technical spirit of the present application are within the scope of the present application.
Claims (10)
1. A calibration method of a natural gas online water dew point meter is characterized by comprising the following steps:
selecting a reference dew point temperature of standard gas, and detecting and acquiring a display dew point temperature of the standard gas, wherein the display dew point temperature corresponds to the reference dew point temperature;
calibrating the indication error of the natural gas online water dew point instrument according to the reference dew point temperature and the display dew point temperature;
calibrating the measurement repeatability of the natural gas online water dew point instrument according to the reference dew point temperature and the display dew point temperature;
and calibrating the alarm performance of the natural gas online water dew point instrument according to the reference dew point temperature.
2. The method for calibrating a natural gas online water dew point meter according to claim 1, wherein the step of calibrating the indication error of the natural gas online water dew point meter according to the reference dew point temperature and the display dew point temperature specifically comprises:
calculating a correction value of the indication value error of the natural gas on-line water dew point instrument by using a formula (1) according to a plurality of reference dew point temperatures of the standard gas and a plurality of display dew point temperatures corresponding to the reference dew point temperatures one by one,
ΔT＝max(Ti-T0) (1)
in the formula: delta T is a corrected value of the indication value error of the natural gas on-line water dew point instrument, and is DEG C;
Tiis one of the plurality of reference dew point temperatures, deg.C;
T0for one of the plurality of displayed dew point temperatures, DEG C.
3. The method for calibrating a natural gas online water dew point meter according to claim 1, wherein the step of calibrating the repeatability of the natural gas online water dew point meter according to the reference dew point temperature and the display dew point temperature specifically comprises:
aiming at the preset reference dew point temperature of the standard gas, within the first preset time, obtaining a group of display dew point temperatures every second preset time, after obtaining n groups of display dew point temperatures,
the measurement repeatability of the natural gas on-line water dew point meter is calculated by using the formula (2),
in the formula: snMeasuring repeatability of the natural gas on-line water dew point meter;
Tithe display dew point temperature of the natural gas on-line water dew point instrument at the ith measurement is DEG C;
n is an integral multiple of the first preset time relative to the second preset time.
4. The method for calibrating a natural gas online water dew point meter according to claim 3, wherein:
the first preset time is 10 min;
the second preset time is 1 min;
and n is 10.
5. The method for calibrating the natural gas online water dew point meter according to the claim 1, wherein the step of calibrating the alarm performance of the natural gas online water dew point meter according to the reference dew point temperature comprises the following steps:
calibrating the alarm function of the natural gas on-line water dew point instrument according to the reference dew point temperature, and
and calibrating the alarm response time of the natural gas online water dew point instrument according to the reference dew point temperature.
6. The method for calibrating the natural gas online water dew point meter according to claim 5, wherein the step of calibrating the alarm function of the natural gas online water dew point meter according to the reference dew point temperature specifically comprises:
selecting the reference dew point temperature as an alarm dew point temperature of the natural gas online water dew point instrument;
checking an alarm condition;
and if the natural gas online water dew point meter gives an alarm, the alarm function of the natural gas online water dew point meter is normal.
7. The calibration method of the on-line natural gas water dew point instrument as claimed in claim 6, wherein the step of the on-line natural gas water dew point instrument alarming to ensure that the alarming function of the on-line natural gas water dew point instrument is normal further comprises the following steps:
adjusting the reference dew point temperature to 80% or 50% of the alarm dew point temperature;
checking an alarm condition;
and if the natural gas online water dew point meter gives an alarm, the alarm function of the natural gas online water dew point meter is normal.
8. The method for calibrating a natural gas online water dew point meter according to claim 5, wherein the step of calibrating the alarm response time of the natural gas online water dew point meter according to the reference dew point temperature comprises:
selecting the reference dew point temperature as an alarm dew point temperature of the natural gas online water dew point instrument;
calculating the alarm response time of the natural gas on-line water dew point instrument according to a formula (3),
Δt＝|t1-t2| (3)
in the formula: delta T is the alarm response time s of the natural gas on-line water dew point instrument;
t1the time for inputting the standard gas into the natural gas on-line water dew point instrument is started;
t2and the time for the natural gas on-line water dew point meter to start alarming.
9. The method for calibrating a natural gas online water dew point meter according to claim 1, wherein the steps of selecting a reference dew point temperature of the standard gas, detecting and acquiring a displayed dew point temperature of the standard gas further comprise
The device is sequentially connected with a standard humidity generator, an output air pump and a natural gas online water dew point instrument;
and adjusting the standard gas pressure input into the natural gas online water dew point instrument by the output gas pump to meet the working requirement of the natural gas online water dew point instrument.
10. The method for calibrating the natural gas on-line water dew point meter according to claim 1, wherein:
the reference dew point temperature ranges from-100 ℃ to 20 ℃.
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