36551-S-MINAET-MTSS of April 27, 2011, published in La Gaceta No. 140 of July 20, 2011, so that it reads as follows:
"Article 7—Maximum emission values. The following maximum emission values are established for boilers and indirect-fired furnaces that burn fossil and biomass-based fuels.
- A)Total Suspended Particulates. Under no circumstances shall the opacity of the emission exceed 20% under normal operating conditions, equivalent to Grade 1 on the Ringelmann scale, or 40% during start-up or cleaning of tubes or chamber, equivalent to Grade 2 on the Ringelmann scale, for five minutes with an observation time of one hour, or the equivalent performed by the competent authority in accordance with Anexo 2:
"Medición de Emisiones de Fuentes Fijas por Observación Externa". The corresponding comparator may be acquired at the Direcciones de Áreas Rectoras of the Ministerio de Salud. Compliance with this limit does not exempt from the sampling and analysis of total suspended particulates. Likewise, it must comply with the provisions of Decreto Ejecutivo Nº 25584- MINAE-H-MP: Reglamento para la Regulación del Uso Racional de la Energía, La Gaceta Nº 215 of November 8, 1996.
The determination of total suspended particulates must be performed using isokinetic sampling.
A.1) Use of liquid and gaseous fossil fuels; biofuels and their blends in boilers and indirect-fired furnaces.
Emissions in mg/m3 (NTP) permitted when using liquid and gaseous fuels | --- | --- | | Boiler or Furnace Size | Total Suspended Particulates | | A | 200 | | B and C | 250 | A.2) Use of solid fossil fuels in boilers and indirect-fired furnaces. Mineral coal and others: 100 mg/m3 (NTP) for all sizes of boilers and indirect-fired furnaces.
A.3) Use of biomass as fuel in boilers and indirect-fired furnaces.
| --- | --- | | Boiler or Furnace Size | Total Suspended Particulates | | A, B and C | 250 | B) Sulfur Dioxide B.1) Use of liquid, gaseous, and biomass-based fuels in boilers and indirect-fired furnaces.
Emissions in mg/m3 (NTP) permitted when using liquid, gaseous, and biomass-based fuels with a sulfur content up to 3.0% by mass | --- | --- | | Boiler or Furnace Size | SO2 | | A | 1400 | | B | 1700 | | C | 2500 | (*) For boilers, classification is according to Decreto Ejecutivo Nº. 26789-MTSS: Reglamento de Calderas, La Gaceta Nº 65 of April 2, 1998, and its amendments.
For indirect-fired furnaces, classification is according to Article 1, subsection B) of this regulation.
SO2 concentrations exceeding 1500 milligrams per normal cubic meter (NTP) shall not be permitted in boilers and indirect-fired furnaces whenever the sulfur content in the liquid fossil fuel available on the national market is less than or equal to 1.0% by mass.
For sulfur content values in the fuel exceeding 3.0% by mass, the emission limit is calculated using the following formula:
Emission limit = 2500 x (sulfur content in the fuel % by mass)/3.0.
B2) Use of solid fossil fuels in boilers and indirect-fired furnaces.
Mineral coal and others: 1500 mg/m3 (NTP) for all sizes of boilers and indirect-fired furnaces.
C. Nitrogen Oxides (NOx) C.1) Use of liquid and gaseous fuels in boilers and indirect-fired furnaces.
| --- | --- | | Boiler or Furnace Size | NOx | | A | 350 | | B | 460 | | C | 550 | C.2) Use of solid fossil fuels in boilers and indirect-fired furnaces.
Mineral coal and others: 860 mg/m3 (NTP) for all sizes of boilers and indirect-fired furnaces.
For comparison purposes with the established maximum emission values, the results of the sampled and analyzed emissions of sulfur dioxide, nitrogen oxides, and total suspended particulates must be reported on a dry basis and referenced to five percent (5%) oxygen for boilers, seven percent (7%) for indirect-fired furnaces, and ten percent (10%) for furnaces and boilers using biomass-based fuels, using the following formulas:
Formula to convert emissions from wet basis to dry basis.
100 EBH EBS =-------------------- 100 - % H2O Where:
EBS= Emission on a dry basis.
EBH= Emission on a wet basis.
% H2O = Moisture content of the gases.
Formula to correct dry-basis gas emissions to the reference oxygen percentage.
(20.9% - Or) Er =---------------------- X Em (20.9% - Om) Where:
Er = Emission calculated to the reference value.
Em = Emission measured on a dry basis.
Or = Reference level for O2, (5%, 7%, or 10% as applicable).
Om = Measured value for O2." Formula to convert concentrations expressed in ppm of a gas to normal mg/m3: