7 Del. Admin. Code § 1120-8.0

Current through Register Vol. 28, No. 1, July 1, 2024

Section 1120-8.0 - Standards of Performance for Sulfuric Acid Plants

8.1 Applicability. The provisions of 8.0 of this regulation are applicable to each sulfuric acid plant, which is the applicable source.

8.2 Standard for Sulfur Dioxide. On and after date on which the performance test required to be conducted by 1.4 of this regulation is completed, no person subject to the provisions of 8.0 of this regulation shall cause to be discharged into the atmosphere from any applicable source any gases which contain sulfur dioxide in excess of two kg per metric ton of acid produced (four lbs per ton), the production being expressed as 100% H₂SO₄.

8.3 Standard for Acid Mist. On and after the date on which the performance test required to be conducted by 1.4 of this regulation is completed, no person subject to the provisions of 8.0 of this regulation shall cause to be discharged into the atmosphere from any applicable source any gases which

8.3.1 Contain acid mist, expressed as H₂SO₄, in excess of 0.075 kg per metric ton of acid produced (0.15 lb per ton), the production being expressed as 100% H₂SO₄.

8.3.2 Exhibit 10% opacity, or greater.

8.4 Emission Monitoring

8.4.1 A continuous monitoring system for the measurement of sulfur dioxide shall be installed, calibrated, maintained, and operated by the person responsible for the applicable source. The pollutant gas used to prepare calibration gas mixtures under 2.1 of this regulation, Performance Specification 2 and for calibration checks under 1.3.5 of this regulation shall be sulfur dioxide (SO₂). Reference Method 8 shall be used for conducting monitoring system performance evaluation under 1.3.3 of this regulation except that only the sulfur dioxide portion of the Method 8 results shall be used. The span shall be set at 1,000 ppm of sulfur dioxide.

8.4.2 The responsible person shall establish a conversion factor for the purpose of converting monitoring data into units of the applicable standard (kg/metric ton, lb/short ton). The conversion factor shall be determined, as a minimum, three times daily by measuring the concentration of sulfur dioxide entering the converter using suitable methods (e.g., the Reich test, National Air Pollution Control Administration Publication No. 999-AP-13) and calculating the appropriate conversion factor for each eight -hour period as follows:

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(8-1)

where:

C_F = conversion factor (kg/metric ton per ppm, lb/short ton per ppm).

k = constant derived from material balance.

For determining C_F in metric units, k = 0.0653.

For determining C_F in English units, k = 0.1306.

r = percentage of sulfur dioxide by volume entering the gas converter.

Appropriate corrections must be made for air injection plants subject to the Secretary's

approval.

s = percentage of sulfur dioxide by volume in the emissions to the atmosphere determined by the continuous monitoring system required under 8.4.1 of this regulation.

8.4.3 The responsible person shall record all conversion factors and values under 8.4.2 of this regulation from which they are computed (i.e., C_F, r, and s).

8.4.4 For the purpose of reports under 1.2.3 of this regulation periods of excess emissions shall be all three-hour periods (or the arithmetic average of three consecutive one-hour periods) during which the integrated average sulfur dioxide emissions exceed the applicable standards under 8.2 of this regulation.

8.5 Test Methods and Procedures

8.5.1 All performance tests shall be conducted while the applicable source is operating at or above the maximum acid production rate at which such source will be operated and under such other relevant conditions as the Secretary shall specify based on representative performance of the applicable source.

8.5.2 The reference methods in Appendix A of 40 CFR Part 60, except as provided for in 1.4.2 of this regulation, shall be used to determine compliance with the standards prescribed in 8.2 and 8.3 of this regulation as follows:

8.5.2.1 Method 8 for the concentrations of SO₂ and acid mist;

8.5.2.2 Method 1 for sample and velocity traverses;

8.5.2.3 Method 2 for velocity and volumetric flow rate; and

8.5.2.4 Method 3 for gas analysis.

8.5.3 The moisture content can be considered to be zero. For Method 8 the sampling time for each run shall be at least 60 minutes and the minimum sample volume shall be 1.15 dscm (40.6 dscf) except that smaller sampling times or sample volumes, when necessitated by process variables or other factors, may be approved by the Secretary.

8.5.4 Acid production rate, expressed in metric tons per hour of 100% H₂SO₄, shall be determined during each testing period by suitable methods and shall be confirmed by a material balance over the production system.

8.5.5 Acid mist and sulfur dioxide emissions, expressed in g/metric ton of 100% H₂SO₄, shall be determined by dividing the emission rate in g/hr by the acid production rate. The emission rate shall be determined by the equation, g/hr = Qs x C, where Qs = volumetric flow rate of the effluent in dscm/hr as determined in accordance with 8.5.2.3 of this regulation, and C = acid mist and SO₂ concentrations in g/dscm as determined in accordance with 8.5.2.1 of this regulation.

04/18/1983

7 Del. Admin. Code § 1120-8.0