---
kind: "section"
citation: "40 C.F.R. § 63.7298"
title: "40"
number: "63.7298"
heading: "What emission limitations must I meet for HNR HRSG bypass/waste heat stacks?"
url: "https://uscodex.org/cfr/40/63.7298"
---

# §63.7298. What emission limitations must I meet for HNR HRSG bypass/waste heat stacks?


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

- (a) Emissions of particulate matter from any HNR HRSG bypass/waste heat stack at a new HNR coke oven battery that exceeds 0.022 gr/dscf at 10 percent oxygen or any HNR HRSG bypass/waste heat stack at an existing HNR coke battery that exceeds 0.032 gr/dscf at 10 percent oxygen.
- (b) Emissions of mercury from any HNR HRSG bypass/waste heat stack at a new HNR coke oven battery that exceeds 8.6E-06 gr/dscf at 10 percent oxygen or any HNR HRSG bypass/waste heat stack at an existing HNR coke oven battery that exceeds 1.2E-05 gr/dscf at 10 percent oxygen.
- (c) Emissions of total acid gases from any HNR HRSG bypass/waste heat stack at a new HNR coke oven battery that exceeds 0.12 gr/dscf at 10 percent oxygen or any HNR HRSG bypass/waste heat stack at an existing HNR coke battery that exceeds 0.095 gr/dscf at 10 percent oxygen.
- (d) Emissions of total PAHs from any HNR HRSG bypass/waste heat stack at a new or existing HNR coke oven battery that exceeds 2.7E-06 gr/dscf at 10 percent oxygen.
- (e) Emissions of formaldehyde from any HNR HRSG bypass/waste heat stack at a new HNR coke oven battery that exceeds 1.8E-05 gr/dscf at 10 percent oxygen or any HNR HRSG bypass/waste heat stack at an existing HNR coke oven battery that exceeds 0.0012 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]