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

Determination of NO_x Emission Intensity

Stack Test or CEMS Test

Marginal note:Conditions

25 The NO_x emission intensity of a boiler or heater must be determined by means of

• (a) a stack test or a CEMS test, if

  • (i) the boiler’s or heater’s rated capacity is at most 262.5 GJ/h, or

  • (ii) the boiler’s or heater’s rated capacity is more than 262.5 GJ/h and its NO_x emission intensity was less than 80% of the NO_x emission intensity limit applicable to it under any of sections 6, 7, 9 to 11, 13 and 14, as determined by means of one or more stack tests during

    • (A) its initial test conducted under section 33, and

    • (B) each of the first two compliance tests conducted under subparagraph 38(2)(c)(i); and

• (b) subject to subsections 26(1) and paragraphs 33(2)(a) and 38(2)(a), a CEMS test in any other case.

Marginal note:Identification — exception to paragraph 25(b)

• 26 (1) The NO_x emission intensity of a boiler or heater that is to be determined under paragraph 25(b) must be determined for a given hour in accordance with subsection (2), if the boiler or heater

  • (a) is not equipped with a CEMS; and

  • (b) has been identified under subsection (5) with another boiler or heater whose NO_x emission intensity is determined for that given hour by means of a CEMS test as a rolling hourly average.

• Marginal note:Greater of stack test and CEMS test

  (2) The NO_x emission intensity of a boiler or heater referred to in paragraph (1)(a) for each hour is the greater of

  • (a) the result of a stack test that is applicable to that hour, and

  • (b) the rolling hourly average for that hour determined by means of a CEMS test conducted on the other boiler or heater referred to in paragraph (1)(b).

• Marginal note:Identification

  (3) A boiler or heater referred to in paragraph (1)(a) may be identified with another boiler or heater referred to in paragraph (1)(b) if the following conditions are met:

  • (a) they have the same manufacturer;

  • (b) they have the same rated capacity;

  • (c) they are designed to have the same NO_x emission intensity;

  • (d) they have the same equipment to preheat air, if any;

  • (e) they combust fuel from a common source;

  • (f) they are juxtaposed; and

  • (g) they are

    • (i) both class 80,

    • (ii) both class 70,

    • (iii) both transitional or modern, or one is transitional and the other is modern, or

    • (iv) both redesigned within the meaning of paragraph 10(2)(b).

• Marginal note:When identification made

  (4) The identification is made as of

  • (a) for class 80 boilers or heaters that underwent a major modification, the recommissioning date of the boiler or heater referred to in paragraph (1)(a);

  • (b) for class 70 boilers or heaters, the earlier of

    • (i) the recommissioning date of the boiler or heater referred to in paragraph (1)(a), if it underwent a major modification, and

    • (ii) January 1, 2036;

  • (c) for transitional or modern boilers or heaters, the commissioning date of the boiler or heater referred to in paragraph (1)(a); and

  • (d) for redesigned boilers or heaters referred to in section 10, the recommissioning date of the boiler or heater referred to in paragraph (1)(a).

• Marginal note:Identification by recording

  (5) The identification is made on the recording of the following information:

  • (a) the name of the manufacturer — along with the serial number, make and model — of the boiler or heater referred to in paragraph (1)(a);

  • (b) the name of the manufacturer — along with the serial number, make and model — of the other boiler or heater referred to in paragraph (1)(b);

  • (c) documentation that establishes that those boilers or heaters meet the conditions set out in paragraphs (3)(b) to (g);

  • (d) an indication that the boiler or heater referred to in paragraph (a) is identified with the boiler or heater referred to in paragraph (b); and

  • (e) the date of the recording.

• Marginal note:At most four identifications

  (6) At most four boilers or heaters may be identified under subsection (5) with a given other boiler or heater referred to in paragraph (1)(b).

Marginal note:Common stack

• 26.1 (1) A stack test or CEMS test at a common stack may be used to determine the NO_x emission intensity for all of the boilers and heaters that share the common stack and are operating during the test.

• Marginal note:Determination of intensity — only boilers or heaters

  (2) For the purposes of sections 34 and 36, if the only devices that share a common stack and are operating during a stack test or CEMS test are boilers or heaters, the result of that test applies when determining the NO_x emission intensity of each of those boilers or heaters.

• Marginal note:Determination of intensity — presence of other devices

  (3) For the purposes of sections 34 and 36, if a boiler or heater shares a common stack with a device to which this Part does not apply and that is operating during the test, the NO_x emission intensity of that boiler or heater is determined by the formula

  (Σ_rQ_r × E_out + Σ_uQ_u × E_out − Σ_uQ_u × E_u) ÷ Σ_rQ_r
  

  where

  Q_r

  is the energy, expressed in GJ, of the fuel combusted during the test by the rth boiler or heater;

  E_out

  is the NO_x emission intensity measured during the test, expressed in g/GJ;

  Q_u

  is the energy, expressed in GJ, of the fuel combusted during the test by the uth device;

  E_u

  is the manufacturer’s guaranteed NO_x emission intensity value, expressed in g/GJ for the uth device or, if the manufacturer has not provided such a guarantee, 26 g/GJ;

  r

  is the rth boiler or heater to which this Part applies that is operating at the common stack during the test, where r goes from 1 to n and n is the number of boilers or heaters that meet those criteria; and

  u

  is the uth device to which this Part does not apply that is operating at the common stack during the test, where u goes from 1 to n and n is the number of devices that meet those criteria.

• Marginal note:Reference period

  (4) For greater certainty, if subsection (2) or (3) applies with respect to section 34, the stack test or CEMS test must have been conducted during the reference period described in subsection 34(1).

• Marginal note:Initial test or compliance test

  (5) For the purposes of sections 33 and 38, the NO_x emission intensity of a boiler or heater that shares a common stack with any other device is deemed not to exceed the applicable limit set out in section 6, 7, 9 to 11, 13 or 14 if the NO_x emission intensity of the common stack does not exceed the limit that is determined by the formula

  (Σ_j(Q_j × L_j) + Σ_k(Q_k × C_k) + Σ_u(Q_u × E_u)) ÷ (Σ_jQ_j + Σ_kQ_k + Σ_uQ_u)

  where

  Q_j

  is the energy, expressed in GJ, of the fuel combusted during the test by the jth boiler or heater;

  L_j

  is the NO_x emission intensity limit, expressed in g/GJ, that applies to the jth boiler or heater;

  Q_k

  is the energy, expressed in GJ, of the fuel combusted during the test by the kth boiler or heater;

  C_k

  is the classification NO_x emission intensity, expressed in g/GJ, of the kth boiler or heater;

  Q_u

  is the energy, expressed in GJ, of the fuel combusted during the test by the uth device;

  E_u

  is the manufacturer’s guaranteed NO_x emission intensity value, expressed in g/GJ for the uth device or, if the manufacturer has not provided such a guarantee, 26 g/GJ;

  j

  is the jth boiler or heater to which this Part applies that is operating at the common stack during the test and that is required under this Part to meet a NO_x emission intensity limit, where j goes from 1 to n and n is the number of boilers or heaters that meet those criteria;

  k

  is the kth boiler or heater to which this Part applies that is operating at the common stack during the test but that is not required under this Part to meet a NO_x emission intensity limit, where k goes from 1 to n and n is the number of boilers or heaters that meet those criteria; and

  u

  is the uth device to which this Part does not apply that is operating at the common stack during the test, where u goes from 1 to n and n is the number of devices that meet those criteria.

• Marginal note:Redetermination after triggering event

  (6) When a triggering event described in subsection 37(3) occurs with respect to a boiler or heater that shares a common stack with any other device, the NO_x emission intensity of the boiler or heater is determined by the formula

  ((Σ_tQ_t + Σ_uQ_u + Σ_xQ_x) × E_out − Σ_uQ_u × E_u − Σ_xQ_x × C_x) ÷ Σ_tQ_t
  

  where

  Q_t

  is the energy, expressed in GJ, of the fuel combusted during the test by the tth boiler or heater;

  Q_u

  is the energy, expressed in GJ, of the fuel combusted during the test by the uth device;

  Q_x

  is the energy, expressed in GJ, of the fuel combusted during the test by the xth boiler or heater;

  E_out

  is the NO_x emission intensity measured during the test, expressed in g/GJ;

  E_u

  is the manufacturer’s guaranteed NO_x emission intensity value, expressed in g/GJ, for the uth device or, if the manufacturer has not provided such a guarantee, 26 g/GJ;

  C_x

  is the classification NO_x emission intensity, expressed in g/GJ, of the xth boiler or heater;

  t

  is the tth boiler or heater to which this Part applies that underwent a triggering event and is, during the test, operating at the common stack, where t goes from 1 to n and n is the number of boilers or heaters that meet those criteria;

  u

  is the uth device to which this Part does not apply that is operating at the common stack during the test, where u goes from 1 to n and n is the number of devices that meet those criteria; and

  x

  is the xth boiler or heater to which this Part applies that did not undergo a triggering event and that is operating at the common stack during the test, where x goes from 1 to n and n is the number of boilers or heaters that meet those criteria.

• Marginal note:Request for information

  (7) A responsible person for a boiler or heater who determines a NO_x emission intensity in accordance with subsection (3), (5) or (6) must, on the Minister’s request, provide to the Minister any supporting data used to make that determination.

Stack Tests

Marginal note:Three test runs

• 27 (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 NO_x emission intensity.

• Marginal note:Exception

  (1.1) However, if conducting a test run that lasts 30 minutes would not be both safe and technically feasible without risking damage to equipment, each test run must last as long as is safe and technically feasible without risking damage to equipment.

• 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 or, if such operation would not be both safe and technically feasible without risking damage to equipment, at the highest percentage of its rated capacity that is safe and technically feasible without risking damage to equipment;

  • (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 NO_x and O₂

• 28 (1) For each test run, the measurements of the concentration of NO_x, 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) [Repealed, SOR/2025-229, s. 10]

    • (ii) for the concentration of NO_x, 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 NO_x emission intensity

29 Based on the concentrations of NO_x and O₂ as measured in accordance with section 28, the NO_x 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

  (NO_x × 1.88 × 10^-3 × F_g)/Σ_i(F_i × HHV_i)

  where

  NO_x

  is the concentration of NO_x ,

  F_g

  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,

  F_i

  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 ,

  HHV_i

  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 F_i, and

  i

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