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Frequently asked questions2022-04-14T13:49:06+00:00
A limit value2021-02-03T09:46:37+00:00

STA limit value to be complied with 100%

AMS2021-02-03T09:49:22+00:00

Automatic Measuring System. Measurement system, which is owned and operated by the plant and which is used for environmental reporting.

Asterisk2021-02-03T10:05:12+00:00

All values have an Asterix attached, which explains how the value is interpreted in ReportLoq.

Asterisk is listed in order of priority.

FLD (First Level Data):

T = Test data

P = Plant not active

S = Plant stopped

D = AMS Rejected (Plexer …)

C = AMS in Maintenance

M = AMS in error

R = Replacement value

V = Valid

STA (Short Time Average):

EN = Environmental reporting not relevant

VR = Replacement value

NV = Not Valid

VA = Valid but exceeded

VP = Valid data with secondary replacement

VD = Valid data

LTA (Long Time Average):

EN = Environmental reporting not relevant

VR = Replacement value

NV = Not Valid

VA = Valid but exceeded

VP = Valid data with secondary replacement

VD = Valid data

B limit value2021-02-03T09:46:25+00:00

STA limit value to be met typically 95/97% of the time on an annual basis.

Calibration interval2021-08-26T11:04:21+00:00

During SRM, a valid calibration interval is defined, which covers a well-defined range (from the zero point to slightly above the highest results from the parallel measurement). AMS signals that are outside the valid calibration interval are valid and must be reported, but a new QAL2 is required if the AMS is outside the valid calibration interval for a longer period of time.

Classic2021-02-03T09:50:08+00:00

Classic refers to the ReportLoq version before EN17255 was implemented.

History: The long awaited standard for environmental reporting systems EN17255-1 was adopted in 2019. Prior to the release of the standard, there were only recommendations for environmental reporting. It has therefore been difficult to unambiguously confirm how data should be validated and calculated. This has meant that each individual supplier has made interpretations, based on their own experience, however with the support of available method sheets (ReportLoq “Classic”). The result has not been satisfactory for either the supplier, end user or environmental body.

In ReportLoq, a lot of time has been spent on developing and quality-assuring compliance with the new standard, and it is Olicem’s recommendation that “Classic” customers change the environmental reporting to follow EN 17255: 2019. There are already references in current method sheets, and typically in connection with a reassessment of a work’s environmental approval, reference will be made to EN 17255.

CO2 – CO2 vol.% Differs greatly in relation to current CO2 vol.% On the CEMS image2021-02-03T09:44:35+00:00

If CO2 is compared with another CO2 calculated under a different O2 reference, the CO2 level will deviate considerably.

CO2 – How are replacement values applied to primary AMS?2021-02-03T09:57:09+00:00

EN 17255 & Classic
Historical replacement values are during the year highest measurement one week back (as prescribed for NO x calculations according to BEK no. 723 of 24/06/2011), and at the end of the year an average of valid intervals plus twice the meter’s standard deviation according to 601/2012 Article 45.

CO2 – How to use CO2 Vol. % for calculating mass[kg] ?2021-02-03T09:44:26+00:00

CO2 Vol.% Is converted to mg / Nm3 using molecular weight 44,009 taken from http://www.kayelaby.npl.co.uk/chemistry/3_1/3_1_2.html after which it is multiplied by flow at STA level

Thereby the calculation becomes: CO2 Vol.% * Molecular weight * Flow Nm3 / h * 0.001 * 0.001 = [kg]

The above information about molecular weight can be found under Company Info

CO2 – What replacement value should be used for peripheral H2O?2021-02-03T09:56:21+00:00

As a replacement value for H2O, 0 volume per cent is used. or the lowest possible volume per cent. for the plant (In accordance with BEK 1412 of 21/12/2012 §3).

CO2 – What replacement value should be used for peripheral O2?2021-02-03T09:56:08+00:00

As a replacement value for O2, 3 volume per cent is used. or the lowest possible volume per cent. for the plant (In accordance with BEK 1412 of 21/12/2012 §3).

CO2 – What replacement value should be used for peripheral Pressure?2021-02-03T09:56:35+00:00

1063 hPa is used as the replacement value for pressure (According to BEK 1412 of 21/12/2012 §3).

CO2 – What replacement value should be used for peripheral Temperature?2021-02-03T09:56:49+00:00

The lowest possible flue gas temperature for the plant in ° C is used as a replacement value for temperature (In accordance with BEK 1412 of 21/12/2012 §3).

CO2 – Why is the reference state set to 0% O22021-02-03T09:45:04+00:00

The O2 reference is set at 0% in accordance with BEK 1412 of 21/12/2012 §4. However, the reference state can be changed as it will not affect the calculated emitted amount since O2 equalizes when multiplied by flow.

DAHS2021-02-03T09:49:10+00:00

Data Acquisition and Handling System Refers to the environmental reporting system which in this case is ReportLoq and the hardware used for this.

Discarded days2021-06-11T12:08:07+00:00

Discarded days occur if the number of goodfactor exceedances in a day exceeds the limit (typically 3 or 5). The number of days discarded is counted in the exceedance report.

ELV2021-02-03T09:48:47+00:00

Environment limit value

Emission value2021-02-03T09:46:11+00:00

Current discharge in reference mode minus confidence interval.

  • Used for checking limit values.
EN 172552021-02-03T09:49:45+00:00

In ReportLoq, a lot of time has been spent on developing and quality-assuring compliance with the new standard, and it is Olicem’s recommendation that “Classic” customers change the environmental reporting to follow EN 17255: 2019. There are already references in current method sheets, and typically in connection with a reassessment of a work’s environmental approval, reference will be made to EN 17255.

FLD2021-02-03T09:48:37+00:00

First Level Data
The logged data. In ReportLoq, data is logged at fixed intervals. Can be set between every 10 and 60 seconds. For emission reporting, there is a requirement for logging every 10 seconds.

Goodfactor2021-08-26T10:19:27+00:00

STA typically needs 66.67% valid FLD values, in order to
– be used for validating environmental requirements
– be used for LTA calculation
FLD value is valid if it is representative of the flue gas composition. An valid AMS measurement can therefore not be in fault or maintenance.

Green value2022-04-27T15:17:13+00:00

Current discharge in reference mode without subtraction of confidence interval.

  • Used for calculating masses [kg]
  • Includes values measured during plant operation, plant startup and plant shutdown
LTA2021-02-03T09:48:23+00:00

Long Term Average average values of a day or more. Is in ReportLoq 1 day or 1 month.

Sigma (σ0)2021-02-03T09:46:51+00:00

σ0 = AMS quality requirement multiplied by 1.96.

SRM2021-02-03T09:47:18+00:00

Measurements performed in parallel with AMS. Parallel measurements are performed by an accredited
measuring company according to standardized reference methods.

STA2021-02-03T10:14:08+00:00

Short Term Average Average values between 1 and 60 minutes.

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