How to do an Emissions Inventory - Oklahoma Department … · Gas, 10-100 million Btu/hr ... –Try...

How to do an

Emissions Inventory

Mark Gibbs

2015 Emissions Inventory Workshop

2015 Emissions Inventory Workshop 2

Emission Inventory Data Flow

Air Permit Data

Webfire & AP-42 Data

Operation & Production Information

Other Data Sources

Completed Emissions Inventory

Submitted to DEQ

Redbud Hardcopy

TAD

Submit by Mail Submit

Electronically

Key Information - Your Air Permit


• Permit writer includes initial application data

• Describes operations & processes

• Lists emission units

• Includes emission calculations & references

• Normally lists the acceptable Emission

Factors

Your Permit Memorandum


Layout of an Inventory • Company – OU Health Sciences Center

• Facility(s) – OKC Campus Services

• Emission unit(s) with release point(s) – Boiler

No. 4 & Boiler No. 4 Stack

• Process(es) – SCC 10300602 =

External Combustion Boilers,

Commercial/Institutional, Natural

Gas, 10-100 million Btu/hr

• Emission(s) – CO, NOx, PM-10, PM-

2.5, SOx, Total VOC, Hexane

5 2015 Emissions Inventory Workshop

Emission Units


What is an emission unit?


What emission units do I report?


• At least the emission units listed in your permit

• The permit is not the final word for

determining what should be in an

emissions inventory

• The permit may list some processes

as:

But Beware !



Insignificant for Permitting


• An emission unit may be insignificant for

permitting, but may not be insignificant

for emissions inventory reporting

• Especially when there are multiple such units

• Are total emissions above the reporting

threshold?

• Contact us to find out about your situation!

What emission units should I report?

Emission Unit Status

• Operating – emission unit operated all or

part of the calendar year.

• Temporarily Shutdown – emission unit

did not operate at all during the calendar

year, but may restart at sometime in the

future.

• Permanently Shutdown – select this status

if an emission unit has been physically

removed or permanently removed from

service.


Emission Release Points



Stack Fugitive

Height above ground level

Storage Tank

Pipe work

Minerals

Stack data often listed in the Permit:



Fugitive Release Points

From Permit:

In Redbud:

Emission Process Information


Emission Processes

• What information will I need?

– Source Classification Code (SCC)

– Process Material

– Process Rates

– Hours the process ran

– Design capacity (if applicable)

– Fuel data (if applicable)


Processes – Source Classification Code (SCC)


• The SCC provides a systematic description of the process

Source Classification Code • You can find the full excel spreadsheet list of SCCs

as well as a smaller table just showing the first 3

digits of the SCCs on our website:

– http://www.deq.state.ok.us/aqdnew/emissions/

TurnAroundDocs.htm

– http://www.deq.state.ok.us/aqdnew/emissions/

Point%20Source%20Categories%20SCC_v2004b.pdf

• Description should match operation as

closely as possible

– Be as specific as possible

– Avoid miscellaneous processes (xxxxxx99)


http://www.deq.state.ok.us/aqdnew/emissions/TurnAroundDocs.htm

Process Material, Rate & Hours


N/A

N/A

Design Capacity & Fuel Data


Combustion Processes Only

Design Capacity


From Specific Conditions:

From Permit Memorandum:

Fuel Heat Content


Other Fuel Data

• Sulfur %: Mass percentage of the

sulfur content in the process fuel

• Ash %: Mass percentage of the ash

content in the process fuel

• For natural gas in Oklahoma report

sulfur & ash percentages as zero


Emissions Information


Emissions • What information will I need?

– What pollutants to report

– Method for calculating the emission amounts

(e.g., emission factors)

– Capture efficiency & control efficiency (if

applicable)

– Amount of actual emissions

– Permit or rule limit (if applicable)

– Excess emissions (if applicable)


Emissions • Report Regulated Air Pollutants (RAPs) – pollutants

regulated by statute, rule, regulation or permit

http://www.deq.state.ok.us/aqdnew/emissions/

OklahomaRegulatedAirPollutants.htm

• Not sure what pollutants come from your process?

– Look at your permit

– Contact your manufacturer or supplier

– Try entering your SCC into EPA’s WebFIRE database

http://cfpub.epa.gov/webfire/index.cfm?

action=fire.SearchEmissionFactors


Report all Actual Emissions • "Actual emissions" means the total amount of

any regulated air pollutant actually emitted

from a given facility during a particular

calendar year, determined using methods

contained in OAC 252:100-5-2.1(d).

• Should include

– Regular operations

– Start-up/shutdown/maintenance

– Excess emissions


Use Best Available Data

• OAC 252:100-5-2.1(d) Method of calculation.

“The best available data at the time the

emission inventory is or should have been

prepared shall be used to determine

emissions.”

• Make sure you are using the most current

emission factors

• Has there been a more recent stack test?


Approximate Ranking of Reliability:

• Continuous Emissions Monitoring

Data (CEMS)

• EPA RM Stack Test

• Similar Unit EPA RM Test

• Mass Balance

• Manufacture Test Data

• TANKS, GRI-GLYCalc, Vasquez-Beggs

• WebFIRE Data Factors

• AP-42, other EPA Documents

Emissions Calculation Methods


What is an Emission Factor?


• An emission factor (EF) relates the quantity of

a pollutant released with an activity or

process rate associated with the release of

that pollutant.

Emissions = Process Rate x EF • Factors are usually expressed as the weight

of pollutant divided by a unit weight,

volume, distance, or duration of the

activity emitting the pollutant.

Emission Factors are often in your permit:


Emission Factors with Safety Factor Should Not Be Used

• Stack testing plus 25% safety factor

• AP-42, 7/98, Sec. 1.4 plus 25% safety factor

• Baghouse manufacturer guarantee plus safety factor


Is an Emission Factor Needed?

• Storage Tanks - TANKS

• Tank Flashing - Vasquez-Beggs equation

• Glycol Dehydrator Reboiler - GRI-GLYCalc

• Landfills - LANDGEM, a gas emissions model

These are models

or formulas using multiple variables.

There is no single emission factor.


No Specific Emission Factor

For the situations on the previous slide & for

complex mass balance calculations enter:

0 * N/A - Formula, Software or CEMS * N/A - Formula, Software or CEMS


Emission Controls

• Control equipment is

reported for each

individual pollutant


Controls


Control Information

• Capture Efficiency - Percentage of air

emissions that are directed to the control

equipment

• Emissions that escape prior to the control

device should be accounted for in the total

actual emissions.

• Control Efficiency - Percentage of air

emissions prevented from being

emitted by a control approach

• Should reflect performance degradation


Emission Amounts

• What should be reported?

All Actual Emissions

Not Permit limits

or

Potential to

Emit Values (PTE)


Emissions – Permit/Rule Limit

• If you have a limit for

a particular process,

list it

• Otherwise,

leave it as 0


• However, ALL actual emissions must be

reported in the total emissions field

• Report quantifiable

emissions that are in

excess of a permit or

other such limit

• Should include total

mass reported under

Subchapter 9 of the

Oklahoma Air Rules


Report Excess Emissions

Report Excess Emissions


Total actual emissions of 8.465 tons includes 0.124 tons of excess emissions

0.124 tons represents total mass of all hourly limit exceedances in the reporting year

The annual limit of 11.74 tons has not been exceeded

Why Your Inventory Is Important

• Missing or incorrect release point data

leads to errors in geographical location of

emissions and impacts photochemical

modeling & health risk assessments.

• Missing or incorrect hours & seasonal

fractions lead to errors in temporal

distribution of emissions.


Why Your Inventory Is Important

• Errors in SCC & SIC impact control

strategy development & attainment plans.

• Missing or incorrect control equipment

data impacts rule development.

• Good data leads to effective air quality

regulation.


Questions?


How to do an Emissions Inventory - Oklahoma Department … · Gas, 10-100 million Btu/hr ... –Try...

Documents

Transcript of How to do an Emissions Inventory - Oklahoma Department … · Gas, 10-100 million Btu/hr ... –Try...