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Multi-Sector Air Pollutants Regulations (SOR/2016-151)

Regulations are current to 2019-08-28

PART 1Boilers and Heaters (continued)

Quantification (continued)

Determination of NOx Emission Intensity (continued)

Stack Tests

Marginal note:Three test runs

  •  (1) A stack test consists of three consecutive test runs conducted within a period of 48 hours, each of which lasts at least 30 minutes and results in a determination of the boiler’s or heater’s NOx emission intensity.

  • Marginal note:Operating conditions for test runs

    (2) The test runs must be conducted while the boiler or heater meets the following conditions:

    • (a) it is operating with at least 50% of the input energy in its combustion chamber resulting from the introduction of gaseous fossil fuel;

    • (b) it is operating at at least 60% of its rated capacity;

    • (c) it is operating at a steady state;

    • (d) it is operating with preheated air, if it is equipped to preheat air; and

    • (e) the same type of gaseous fossil fuel — natural gas or alternative gas — is introduced into its combustion chamber.

Marginal note:Concentrations of NOx and O2

  •  (1) For each test run, the measurements of the concentration of NOx, expressed in ppmvd, and the concentration of O2, expressed as a percentage determined by volume on a dry basis, in the boiler’s or heater’s flue gas must be made simultaneously and in accordance with either

    • (a) the following EPA methods:

      • (i) for the location of the sampling port and its traverse points, EPA Method 1 or EPA Method 1A, as applicable,

      • (ii) for the concentration of NOx, EPA Method 7E, and

      • (iii) for the concentration of O2, EPA Method 3A; or

    • (b) ASTM D6522-11 and, for the location of the sampling port and its traverse points, EPA Method 1 or EPA Method 1A, as applicable.

  • Marginal note:Exception — EC Method A

    (2) Despite subsection (1), the location of the sampling port and its traverse points may be determined for the purpose of that subsection in accordance with EC Method A.

Marginal note:Determination of NOx emission intensity

 Based on the concentrations of NOx and O2 as measured in accordance with section 28, the NOx emission intensity, expressed in g/GJ, of the boiler or heater must be determined for each test run

  • (a) by means of the appropriate calculation of emissions by F-factors set out in Appendix A to the EC CEMS Code; or

  • (b) by the formula

    (NOx × 1.88 × 10-3 × Fg)/Σi(Fi × HHVi)

    where

    NOx
    is the concentration of NOx ,
    Fg
    is the flow rate of the flue gas, expressed in m3/h at 25°C and 101.325 kPa, as measured in the test run and determined in accordance with EPA Method 4 or EC Method D and converted to its flow rate on a dry basis in accordance with EPA Method 2 or EC Method B,
    Fi
    is the flow rate of the ith fuel combusted, expressed for a solid or liquid fuel in a given unit/h and for a gaseous fuel in m3/h at 25°C and 101.325 kPa ,
    HHVi
    is the higher heating value of the ith fuel combusted, being
    • (a) for commercial grade natural gas, expressed in GJ/standard m3,

      • (i) the higher heating value determined in accordance with any of the required HHV methods set out in section 22that apply, or

      • (ii) 0.03793, and

    • (b) in any other case, the higher heating value of that ith fuel determined in accordance with any of the required HHV methods set out in section 22 that apply, expressed in GJ/the given unit referred to in the description of Fi, and

    i
    is the ith fuel combusted, where i goes from 1 to n and n is the number of fuels combusted.

Marginal note:NOx emission intensity — average

 The NOx emission intensity of the boiler or heater determined by means of a stack test is the average of the three determinations — one for each test run — of its NOx emission intensity.

Marginal note:NOx emission intensity — deemed hours

 The average referred to in section 30 is deemed to be the NOx emission intensity of the boiler or heater

  • (a) for every hour of the day on which the third test run is conducted; and

  • (b) for every subsequent hour until its NOx emission intensity is determined based on another stack test or a CEMS test, if, for each of those subsequent hours,

    • (i) the same type of gaseous fossil fuel — natural gas or alternative gas — is introduced into its combustion chamber,

    • (ii) for a modern boiler, the thermal efficiency of the boiler is in the same range, namely,

      • (A) < 80%,

      • (B) ≥ 80% and ≤ 90%, or

      • (C) > 90%, or

    • (iii) for a modern heater, the difference between the temperature, expressed in °C, of its preheated air and the ambient air is

      • (A) in the case that no preheated air is introduced into the combustion chamber, 0, and

      • (B) in the case that the heater is equipped to preheat air, in the same range, namely,

        • (I) for a heater that combusts natural gas,

          1 > 0 and ≤ 150, or

          2 > 150, and

        • (II) for a heater that combusts alternative gas,

          1 > 0 and ≤ 155, or

          2 > 155.

Continuous Emission Monitoring System

Marginal note:Rolling hourly average

  •  (1) Subject to subsection (3), the NOx emission intensity of a boiler or heater determined by means of a CEMS for a given hour is the rolling hourly average for the given hour in an averaging period, established as follows:

    • (a) if the averaging period consists of at least 720 hours and

      • (i) the given hour is the 721st hour or a subsequent hour in the period, the rolling hourly average for that given hour is the average of the hourly NOx emission intensity for that hour and for each of the preceding 719 hours, or

      • (ii) the given hour is the 720th hour or a preceding hour in the period, the rolling hourly average for that given hour is the rolling hourly average for the 720th hour, namely, the average of the hourly NOx emission intensity for that 720th hour and for each of the preceding 719 hours; and

    • (b) if the averaging period consists of less than 720 hours, the rolling hourly average for that given hour is the average of the hourly NOx emission intensity for the averaging period.

  • Marginal note:Averaging period

    (2) The averaging period is each period that consists of consecutive hours when at least 50% of the input energy in the boiler’s or heater’s combustion chamber results from the introduction of gaseous fossil fuel.

  • Marginal note:Modern — new averaging period

    (3) For a modern boiler or heater, a new averaging period begins whenever the type of gaseous fossil fuel changes from natural gas to alternative gas, or vice versa.

  • Marginal note:Reference period — new averaging period

    (4) Despite subsections (2) and (3), an averaging period begins when a reference period begins — and an averaging period ends when a reference period ends — for an initial test, a determination or redetermination of a classification NOx emission intensity, a compliance test or a change report in respect of a change referred to in paragraph 43(1)(e) or (f).

  • Marginal note:Hourly NOx emission intensity

    (5) The hourly NOx emission intensity for a given hour is the average over the hour of the NOx emission intensities of the boiler or heater, determined in accordance with

    • (a) Section 3.4.1 of the EC CEMS Code; or

    • (b) Section 2.5.1 of the Alberta CEMS Code.

 
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