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**Subpart BB —**  **Silicon Carbide Production**
Silicon carbide production includes any process that produces silicon carbide for abrasive purposes. § 98.280 Definition of the source category.

You must report GHG emissions under this subpart if your facility contains a silicon carbide production process and the facility meets the requirements of either §98.2(a)(1) or (a)(2). § 98.281 Reporting threshold.

You must report: § 98.282 GHGs to report.

(a) CO 2 and CH 4

(b) CO process emissions from all silicon carbide process units or furnaces combined
.

2 , CH 4 , and N 2 O emissions from each stationary combustion unit. You must report these emissions under subpart C of this part (General Stationary Fuel Com bustion Sources) by following the requirements of subpart C.

You must calculate and report the combined annual process
CO § 98.283 Calculating GHG emissions.

2 emission s from each all silicon carbide process unit or unit s and production furnace furnace s using the procedures in either paragraph (a) or (b) of this section. You must determine CH 4 process emissions in accordance with the procedures specified in paragraph (d) of this section.Page 2 of 8 (a) Calculate and report under this subpart the combined annual pr ocess CO 2

(b) Calculate and report under this subpart the combined annual process CO emission s by operating and maintaining CEMS according to the Tier 4 Calculation Methodology specified in §98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part (General Stationary Fuel Combustion Sources).

2

(1) Use Equation BB

– 1 of this section to calculate the facility

- specific emissions factor for determ ining CO emission s using the procedures in paragraphs (b)(1) and (b)(2) of this section.

2 emission s. The carbon content must be measured monthly and used to calculate a monthly CO 2 emissions factor:

Where:

EF CO 2 , n = CO 2 emission s factor in month n (metric tons CO 2 0.65 = Adjustment factor for the amount of carbon in silicon carbide product (assuming 35 percent of carbon input is in the carbide product). / metric ton of petroleum coke consumed).

CCF n =

44/12 = Ratio of molecular weights, CO Carbon content factor for petroleum coke consumed in month n from the supplier or as measured by the applicable method incorporated by r eference in §98.7 according to §98.284(c) (percent by weight expressed as a decimal fraction).

2 to carbon.Page 3 of 8
(2) Use Equation BB

– 2 of this section to calculate C alculate annual CO 2 process emissions from all silicone the silicon carbide production facility according to Equation BB

- 2 of this section :

Where:

CO 2 = Annual CO 2 emission s from silicon carbide production facility (metric tons CO 2 T )
.

n =

EF CO Petroleum coke consumption in calendar month n (tons).

2 , n = CO 2 2000/2205 = Conversion factor to convert tons to metric tons. emission s factor from month n (calculated in Equation BB

– 1 of this section).

n = Number of month. (c) If GHG emissions from a silicon carbide production furnace or process unit are vented throu gh the same stack as any combustion unit or process equipment that reports CO 2 emission s using a CEMS that complies with the Tier 4 Calculation Methodology in subpart C of this part (General Stationary Fuel Combustion Sources), then the calculation methodo logy in paragraph (b) of this section shall not be used to calculate process emissions. The owner or operator shall report under this subpart the combined stack emissions according to the Tier 4 Calculation Methodology in §98.33(a)(4) and all associated

re quirements for Tier 4 in subpart C of this part.Page 4 of 8 (d) You must calculate annual process CH 4 emissions from all silicon carbide production combined using Equation BB

– 3 of this section:

Where:

CH 4 = Annual CH 4 emissions from silicon carbide production facility (metric tons CH 4 T )
.

n 10.2 = CH = Petroleum coke consumption in month n (tons).

4 emissions factor (kg CH 4 2000/2205 = Conversion factor to convert tons to metric tons. /metric ton coke).

0.001 = Conversion factor from kilograms to metric tons.
n = Number of month. § (d) [Reserved]

(a) You must measure your consumption of petroleum coke using plant instruments used for accounting purposes including direct measurement weighing the petroleum coke fed into your process (by belt scales or a similar device) or through the use of purchase records. § 98.284 Monitoring and QA/QC requirements.

(b) You must document the procedures used to ensure the accuracy of monthly petroleum coke consumption measurements. (c) For CO 2 process emissions, you must determine the monthly carbon content of the petroleum coke using reports from the supplier. Alternatively, facilities can measure monthly Formatted: Font: (Default) Arial, 9 ptPage 5 of 8 carbon contents of the petroleum coke using ASTM D3176

– 89 (Reapproved 2002) St andard Practice for Ultimate Analysis of Coal and Coke (incorporated by reference, see §98.7) and ASTM D5373

– 08 Standard Test Methods for Instrumental Determination of Carbon, Hydrogen, and Nitrogen in Laboratory Samples of Coal (incorporated by reference, see (d) For quality assurance and quality control of the supplier data, you must conduct an annual measurement of the carbon content of the petroleum coke using ASTM D3176

– 89 and ASTM D5373

– 08 Standard Test Methods for Instrumental Determination o f Carbon, Hydrogen, and Nitrogen in Laboratory Samples of Coal (incorporated by reference, §98.7).

see §98.7).

For the petroleum coke input procedure in §98.283(b), a complete record of all measured parameters used in the GHG emissions calculations is required ( § 98.285 Procedures for estimating missing data.

e.g.

(a) For each missing value of the monthly carbon content of petroleum coke, the substitute data value shall be the arit hmetic average of the quality

- assured values of carbon , carbon content values, etc.). Therefore, whenever a quality

- assured value of a required parameter is unavailable, a substitute data value for the missing parameter shall be used in the calculations as sp ecified in the paragraphs (a) and (b) of this section. You must document and keep records of the procedures used for all such estimates.Page 6 of 8 contents immediately preceding and immediately following the missing data incident. If no quality

- assured data on carbon contents are available prior to the missing data incident, the substitute data v alue shall be the first quality

- assured value for carbon contents obtained after the missing data period. (b) For each missing value of the monthly petroleum coke consumption, the substitute data value shall be the best available estimate of the petroleum coke consumption based on all available process data or information used for accounting purposes (such as purchase records).

In addition to the information required by §98.3(c), each annual report must contain the info rmation specified in paragraphs (a) or (b) of this section, as applicable for each silicon carbide production facility. § 98.286 Data reporting requirements.

(a) If a CEMS is used to measure process CO 2

(1) Annual consumption of petroleum coke (tons). emission s, you must report under this subpart the relevant information required for the Tier 4 Calculation Methodology in §98.36 and the information listed in this paragraph (a):

(2) Annual production of silicon carbide (tons). (3) Annual production capacity of silicon carbide (tons). (b) If a CEMS is not used to measure process CO 2 emission s, you must report the information listed in this paragraph (b ) ) (1)Page 7 of 8 through (b)(8) of this section for all silicon carbide process units or production furnaces combined : (1) Monthly consumption of petroleum c oke (tons). (2) Annual production of silicon carbide (tons). (3) Annual production capacity of silicon carbide (tons). (4) Carbon content factor of petroleum coke from the supplier or as measured by the applicable method in §98.284(c) for each month (perce nt by weight expressed as a decimal fraction). (5) Whether carbon content of the petroleum coke is based on reports from the supplier or through self measurement using applicable ASTM standard method. (6) CO 2 emission s factor calculated for each month (met ric
tons CO 2 (7) Sampling analysis results for carbon content of consumed petroleum coke as determined for QA/QC of supplier data under §98.284(d) (percent by weight expressed as a decimal fraction). / metric ton of petroleum coke consumed)
.

(8) Number of t imes in the reporting year that missing data procedures were followed to measure the carbon contents of petroleum coke (number of months) and petroleum coke consumption (number of months). § 98.287 Records that must be retained.Page 8 of 8
In addition to the records required by §98.3(g), you must retain the records specified in paragraphs (a) and (b) of this section for each silicon carbide production facility. (a) If a CEMS is used to measure CO 2

(1) Records of all petroleum coke purchases. emission s, you must retain under this subpart the records required for the Tier 4 Calculation Methodology in §98.37 and the information listed in this paragraph (a):

(2) Annual operating hours. (b) If a CEMS is not used to measure emissions, you must retain records for the informat ion listed in this paragraph (b): (1) Records of all analyses and calculations conducted for reported data listed in §98.286(b). (2) Records of all petroleum coke purchases. (3) Annual operating hours.

All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part. § 98.288 Definitions.