ISO-11042-2-1996.pdf
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1、INTERNATIONAL STANDARD IS0 11042-2 First edition 1996-08-01 Gas turbines - Exhaust gas emission - Part 2: Automated emission monitoring Turbines c) gaz - omissions de gaz d readings for a stated value of air quality characteristic and for a zero samole: bv convention. this value of air b) a measurin
2、g device which, from the physical or chemical properties of the components of the gas sample analysed, gives signals allowing the quantification of the components; quality characteristic is selected to be 95 % of the up- per limit of a gas concentration measurement range as it may be specified for a
3、ffected source categories. c) signal processing devices (amplification, record- 3.5.4 span instability (drift): Change in instrument ing) or, if needed, data processing devices. output in response to a calibration gas of 90 % of the See IS0 7504:1984. measuring range(s) of the instrument over a stat
4、ed period of unattended operation. 3.4 sampling principle: Representative sampling of gases in the duct including both extractive and non- extractive methods. See IS0 10396: 1993. 3.6 system calibration characteristics: Aspects of measurement functions with pertinence to calibration. The following a
5、spects are taken into consideration NOTE 1 In extractive sampling, these gases must be conditioned to remove aerosol, particle matter and other interfering substances before being conveyed to the in- struments. In non-extractive sampling, the measurements are in situ, therefore no sample conditionin
6、g will be re- quired. 3.6.1 calibration function: Instrument reading as a function of some measurable property of the specific component(s) under investigation and obtained by the reference manual method (see IS0 11042-I) with all the interferences remaining constant. 3.4.1 extractive sampling: Incl
7、udes extraction of the sample, removal of interfering materials and main- tenance of gas concentration throughout the sampling system for subsequent analysis by appropriate in- strumentation (see figure 1). 3.6.2 linear function: Calibration function wherein the instrument reading is linear with res
8、pect to the concentration of specific component(s) measured by the reference manual method (see IS0 11042-I 1. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 22:36:34 MDTNo repr
9、oduction or networking permitted without license from IHS -,-,- Q IS0 1 Baffle 2 In-stack filter 3 Tee 4 Probe 5 Port 6 Cap 7 Pressure gauge 8 To zero and reference gases 9 Thermally insulated sampling line IO Temperature controller (line) 11 Temperature controller 12 Filter 13 Heater 14 Refrigerati
10、on unit 15 Water discharge 16 Vacuum gauge 17 Bypass valve 18 Pump 19 Sampling line (heating optional) 20 Manifold 21 To analyserfs) 22 Rotameter 23 Excess sample gas discharge Figure 1 - Example of an extractive sampling and conditioning system Copyright International Organization for Standardizati
11、on Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 22:36:34 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 11042-2:1996(E) Key 1 Measurement cell 2 Probe filter 3 Probe 4 Exhaust gas duct 5 Gas calibratio
12、n line 6 Data recorder 7 Protective hood 8 Instrument transceiver 9 Probe mounting Figure 2 - Example of a point non-extractive monitor Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19
13、/2007 22:36:34 MDTNo reproduction or networking permitted without license from IHS -,-,- Q IS0 IS0 11042-2:1996(E) 1 Lamp 2 Transmitter assembly 3 Internal gas calibration cell 4 Receiver assembly 5 Protective window 6 Detector 7 Electronic module 8 Data recorder 9 Exhaust gas duct 10 Alignment/cali
14、bration pipe 11 Purge air blower 12 Gas calibration line Figure 3 - Example of a path non-extractive monitor 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 22:36:34 MDTNo repr
15、oduction or networking permitted without license from IHS -,-,- IS0 11042-2:1996(E) 0 IS0 3.6.3 non-linear function: Calibration function wherein the instrument reading is not linear with re- spect to the concentration of specific component(s) measured by the reference manual method (see IS0 11042-I
16、 ). NOTE 2 Non-linearity may be expressed by higher order regression coefficients. 3.6.4 confidence interval: Interval with lower and upper limits within which the mean values of the re- gression line lie with a given level of confidence. 3.6.5 tolerance interval: Interval with lower and upper limit
17、s within which is contained a specified per- centage of the population with a given level of confi- dence. 3.6.6 plausibility test: Test designed to compare the measured carbon content in the exhaust gas (from COz, CO and UHCs) with the calculated carbon con- tent for the gas turbine fuel, the accep
18、table difference between these values being agreed between both parties. 4 Symbols and abbreviations The symbols and abbreviations of IS0 11042-I :1996, clause 4, shall apply. 5 Monitoring programme 5.1 Monitoring system See figure 4. Monitoring requires sampling and analyser systems, which continuo
19、usly sense the exhaust gas as well as status data of the gas turbine plant and produce sig- nals for the electronic evaluation system. - so5 measurement only required in the case where continuous sulfur re- moval is applied or sufficiently detailed fuel analysis is not pro- vided or where specifical
20、ly agreed by both parties. - NO,: measurement always required NOTE 4 If agreed upon, only the NO content is to be analysed providing the NOp content does not exceed 10 % of the total NO,. A value of NOz, which should be determined by a reference test, must be added to the NO read- ing. - cop: -co: m
21、easurement required if no direct 02 measurement is performed. measurement required if agreed upon between the parties, particu- larly when monitoring partial loads. - UHCs: measurement required if agreed upon between the parties. - vocs: measurement required if agreed upon between the parties. - 02:
22、 measurement required for correc- tion of data either by direct meas- urement or by calculation. - NHs: measurement only required for plant with catalytic reactor for NO, reduction using NHs. Other constituents may be monitored by agreement, especially where fuels containing toxic components are uti
23、lized. NOTE 5 It should be noted that COz, CO and UHC meas- urements are required to determine, by calculation, the plant mass flow. This value may then be compared with the manufacturers design mass flow as a test for measure- ment plausibility. 5.2 Constituents to be measured The constituents to b
24、e mandatorily measured shall be agreed upon between the parties in accordance with local regulations. The following list of constituents may be monitored. 5.3 Operating data to be recorded These data shall be recorded at the time of measure- ment of the constituents. - Dust and smoke: measurement on
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