---
kind: "section"
citation: "40 C.F.R. § 63.7297"
title: "40"
number: "63.7297"
heading: "What emission limitations must I meet for HNR HRSG main stacks?"
url: "https://uscodex.org/cfr/40/63.7297"
---

# §63.7297. What emission limitations must I meet for HNR HRSG main stacks?


You must not discharge to the atmosphere any emissions from any HNR HRSG main stack at a new or existing HNR coke oven battery that exhibit emissions greater than the applicable limits in [paragraphs (a) through (d)](#a..d) of this section.

- (a) Emissions of particulate matter from any HNR HRSG main stack at a new HNR coke oven battery that exceeds 8.8E-04 gr/dscf at 10 percent oxygen or any HNR HRSG main stack at an existing HNR coke oven battery that exceeds 0.0049 gr/dscf at 10 percent oxygen.
- (b) Emissions of mercury from any HNR HRSG main stack at a new HNR coke oven battery that exceeds 1.5E-06 gr/dscf at 10 percent oxygen or any HNR HRSG main stack at an existing HNR coke oven battery that exceeds 3.0E-06 gr/dscf at 10 percent oxygen.
- (c) Emissions of total acid gases from any HNR HRSG main stack at a new HNR coke oven battery that exceeds 0.0034 gr/dscf at 10 percent oxygen or any HNR HRSG main stack at an existing HNR coke oven battery that exceeds 0.049 gr/dscf at 10 percent oxygen.
- (d) Emissions of total PAHs from any HNR HRSG main stack at a new HNR coke oven battery that exceeds 4.7E-07 gr/dscf at 10 percent oxygen or any HRSG main stack at existing HNR coke oven battery that exceeds 4.8E-07 gr/dscf at 10 percent oxygen.

## Notes

### Amendments

[89 FR 55743, July 5, 2024]

### Source

Source: 68 FR 18025, Apr. 14, 2003, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.

### Amendments

[89 FR 55743, July 5, 2024]