PPL Ens:r9V'

Northeast Energy Associates, Inc. 92 Depot Street Bellngham, MA 02019 (508) 9664872

Tune 29 , 2007

Mr, Donald Dahl US EP A, Region 1

One Congress Street Boston, MA 02114-2023

Subject: Startup and Shutdown Limits Bellngham Cogeneration Facilty

Dear Mr, Dahl:

The Bellngham Cogeneration Facility ("the Facilty") requests that the following limits on the combustion turbines be incorporated into the PSD permit as part of the fuel oil flexibilty application that EP A is currently processing:

Startup

o NO average of 865 pounds per hour over a 2-hour period

o CO average of 1000 pounds per hour over a 2-hour period

o VOC average of 80 pounds per hour over a 2-hour period

Shutdown

o NO average of 1080 pounds per hour over a 2-hoUI period

o CO average of 1000 pounds per hour over a 2-hour per iod

o VOC average of 80 pounds per hour over a 2-hoUt period

Actual emissions fium the turbines are compared to these limits at a common stack location air plan approval letter

(#W081465-Al) issued by the Massachusetts Department of Environmental Protection MassDEP") on 1/11/07 The and CO limits are also in the initial Operating Permit (signed

7/9/02)..

These limits have already been incorporated into the 310 CMR 702

As you requested, a sample of recent startup and shutdown NO and CO pounds per hour data is presented in Attachment L Ihedata set includes the cold startups that occUIred since May and all of the startups that occurred during the first four months of 2007, The data set only includes gas-fired startups and shutdowns since representative oil-fired data is not yet available"

The normal startup procedure in place during this data set staggers the time in which each combustion turbine lights off The second combustion turbine does not light off until the steam turbine has been warmed up and is ready to accept the additional steam (typically at least two

2006

hours after the fir st combustion turbine); otherwise, if both combustion turbines started at once the smplus steam generated would have to be sent to the air cooled condenser as wasted energy As a result of the staggered stattups, actual mass emission rates are generally well below the startup permit limits, However, this wil not always be the case The Facility used to statt both combustion turbines concurrently, The Facility would revert back to this procedure under the following two scenarios:

In the event of an emergency, the Facilty may be directed by the ISO to generate the most MW as soon as possible, in which case the Facilty would be required to start both combustion tUI bines concurrently

2.. If the steam turbine generator was damaged and/or down for repairs, the combustion tur bines would be capable of operating in simple cycle mode, in which case both combustion turbines could be stated concurrently..

Another reason why the current startup and shutdown limits are appropriate is that fuel oil is expected to result in higher NO , CO and VOC emission rates than on gas. Representative oil-fired startup and shutdown data was not available when the limits were initially developed,

You have also indicated that EP A intends to include startup and shutdown concentration limits in terms of pounds per millon British thermal units Proposed concentration limits(lb/MMtu).

were derived by dividing the mass-based startup and shutdown limits by an average heat input rate during a startup or shutdown" The average heat input rate was estimated to equal half ofthe units ' maxmum rated heat input capacity (i e (0 MMBtuhr + 2560 MMBtu/hr) 2 = 1280

" The Facility proposes the following limits:MMtu/hr)

Startup

o NO aver age of 0 676 IbfMMBtu over a 2-hour period

o CO average ofO. 7811blMtu over a 2-hour period

o VOC average of 0 063 IbfMMBtu over a 2-hour period

Shutdown

o NO", average of 0. 844lblMtu over a 2-hour period

o CO aveIage of O..7811b/MBtu over a 2-hour period

o VOC average of 0.063 IblMtu over a 2-hour period

If you have any questions, please feel flee to contact Sean Gregory at 978-730-9977 or me at 508-966-4872 x225 Thank you for your attention to this matter

Sincerely,

Q61Jf;,- Pcir:r (l.. fh/

Peter G Holzapfel General Manager

hours after the fir st combustion turbine); otherwise, if both combustion turbines started at once the surplus steam generated would have to be sent to the air cooled condenser as wasted energy As a result of the staggered startups, actual mass emission rates are generally well below the statup permit limits, However, this wil not always be the case. The Facility used to stmt both combustion turbines concurrently. The Facilty would revert back to this procedure under the following two scenarios:

In the event of an emergency, the Facility may be directed by the ISO to generate the most MW as soon as possible, in which case the Facility would be required to start both combustion tm bines concurrently

2" If the steam turbine generator was damaged and/or down for repairs, the combustion tur bines would be capable of operating in simple cycle mode, in which case both combustion turbines could be stated concurrently"

Another reason why the current startup and shutdown limits are appropriate is that fuel oil is expected to result in higher NO , CO and VOC emission rates than on gas. Representative oil-fired startup and shutdown data was not available when the limits were initially developed,

You have also indicated that EP A intends to include startup and shutdown concentration limits in terms of pounds per milion British thermal units (lb/MMtu).. Proposed concentration limits were derived by dividing the mass-based startup and shutdown limits by an average heat input rate dm ing a startup or shutdown. The aver age heat input rate was estimated to equal half of the units ' maxmum rated heat input capacity (i e (0 MMBtulhr + 2560 MMBtu/hr) 2 = 1280

MMtu/hr)" The Facility proposes the following limits:

Startup

o NO average of 0 6761b/MMBtu over a 2-hour period

o CO average of07811bIMtu over a 2-hour period

o VOC average of 0 063 Ib/MMBtu over a 2-hour period

Shutdown

o NO average of 0.8441blMtu over a 2-hour period

o CO avemge ofo..781IbIMBtu over a 2-hour period

o VOC average of 0.063 IblMtu over a 2-hour period

If you have any questions, please feel ftee to contact Sean Gregory at 978-730-9977 or me at 508-966-4872 x225 Thank you for your attention to this matter

Sincerely,

Q6/J p"h:.r a" lh/

Peter G Holzapfel General Manager

cc: Thomas Cusson, MassDEP CERO James White, FPL Energy Paul Aroman, F PL Energy Skelly Holmbeck, F PL Energy Tim Oliver, FPL Energy Sean Gregory, DSG Solutions, LLC Bellingham Cogeneration Facility, file copy

Attachment 1

Startup and Shutdown Data

Attachment 1

Startup and Shutdown Data

----

-..

---

..,. -

Bel

lingh

am

Ib/h

r S

tart

up E

mis

sion

Rat

es

. Unit 1 & 2 NOx

Ib/h

r

800

­Cold Startups N

O Ib

/hr

star

tup

limit

= 8

65 I

b/hr

ove

r a

2-hr

per

iod

700 -j

600

500

Janu

ary

- A

pril

2007

:: 400

Star

tups

Ib/h

r st

eady

sta

te30

0 lim

it pl

ant t

otal

= 2

20lb

/hr

200 +.

100

--' '-..-------,--- ""--'."-'---.-- ----

Bellingham Ib/hr Startup Emission Rates . Unit 1 & 2 NOx Ib/hr

800 ­Cold Startups

Ib/hr startup limit = 865 Ibfhr over a 2-hr period

700

600

500

January - April 2007

7cJo \0J 400 Startups

300 Ib/hr steady state limit plant total = 220lb/hr

200

100 --­

s:

--- --.-..... .---------- "."-- ,,.- --- _.-... "... ,,,"...-.-...-----"-.......-. .,,-_. "-' --' -...._-- .-.- -."'---------...- ..... "" ,,--- '-' ------ ---- ---'--- -.- .-----"--- ...- .._..".. ---._- -..-- ----".,,-,,-------.--- ....._.,--- ,'. .._- '-' ""-""- -"., ''', .___ ----,,---

Bellingham Ib/hr Shutdown Emission Rates . Unit 1 & 2 NOx Ib/hr

1000 shutdowulim. = 1080 Ib/hr over a 2-hr period

Shutdowns Associated January - April 2007 900

rtP' . Shutdowns800

700

600 -_U"

500 t-.,,--- 4I­...n400

Ib/hr steady state Iimit plant total _.c­300

w.'200

"'.n n... 'n_._- '.'0"100

:: -,.- - --""....-.---"'.. ''''''------""-"-'-' .,,- --...- .,,-...- ...- ..,.....-..----_ ----- ---........- .-.....- --""_...- +-....---.._..,,- ..."-- ,,. .".. ---...- "-..-..- -..-.. -.."...-...---------- ''__- ."... .,, "......,, .._ ..._._.....",-

Bellingham Ib/hr Shutdown Emission Rates . Unit 1 & 2 NOx Ib/hr

1000 NO. lblh,shutown';m;, .1080 Ib/hr over a hr period

900 Shutdowns Associated wi January April 2007 Shutdowns--'h'800

700

"i 600

1-- r'-...,,_-­500

''un400 Ib/hr steady state

limit plant total300

200 _h-"

'''._.m n-h'..".100

-.. -,, --_..... -'.,.,_-.. ._. "... ,_. ------- -.._ _._,--"'"'" -," ... .--'-.-..-",..-- -_...... ----....-- "'---- .-" "..- '__ ',",- .._----------.........- ----'-.',"- .----- ,.". '-"-..- ..-.- -,"..,--_..._-.....' ..

Bellingham CO Ib/hr Startup Emission Rates

. Unit 1 & 2 CO Ib/hr

140 lb/hr steady state limit plant total = 1321b/hr CO lb/hr startup limit = 1000 Ib/hr over a 2-hr period

120

January - April 2007

100 Startups

._,-- Cold Startups n_..­

-.- ,---_. ..- .-. -.. ---.-.. -",. --_.,... ..... ,-- .------ -... ..-...----" ._- ____ ,._- ... .----..--'.....--. ...,--- -------- '... ._._.. -'''- "-----*.--- -.....-..- .......--- - --,.--- --------' ._..--- _._- '.- "....-...-... --_..

Bellingham CO Ib/hr Startup Emission Rates

. Unit 1 & 2 CO Ib/hr

140 CO Ib/hr steady state limit plant total = 1321b/hr CO Ib/hr startup limit = 1000 Ib/hr over a 2-hr period

120 'A",

January - April 2007 100 _.n. Startups

Cold Startups

A_­

___h_"

..m n__

--...-....- . '__ "--""..--- -.. ..."".. ------..-.----..------ --....,...-..---"-- -_.,--- ,--,.",--" '''...-..-.,,,- ---".,... ........-....- --- '.'.'........---- "--' ''"",--.'---- --- .------_._-----...-.,- -.._- ....--. ..,, --- .,- .".,,,.,.--..-------." ...- .-.......... .'-- .."...... ... ._.,-_....'.. ..."-----...- ".-- ---..- ..,_.."-- ______--.----.- ----- ... ...,,--......... ..----, ..,_.-

Bellingham CO Ib/hr Shutdown Emission Rates . Unit 1 & 2 CO Ib/hr

500 Ib/hr shutdown limit = 1000 Ib/hr over a period

450 __n

400 _n_..-___­Shutdowns Associated

Cold Startps 350 ".'n­

'i 300 no...._..

January - April 2007 :e 250 Shutdowns

200 Ib/hr steady state limit plant total 132 Ib/hr

150

100 _u­

,_.. "....-- '-- '..-.-- .."- --- _-- ------ .--------.------ _._ --- ""'--"_-.,,--. ,_._.- ,--..-.- """' -_.._- ".---..--,,-...,,-....- ",."...-.. '--' ,........--- -""-' .-...".---- -.._---------..--.-. ,,,.-"-- ,..--. ..,,..---_. ..._-- --....-.--......--.--..---.--- -,.....- .,."...... ,....-.-- .--.... ... ._._.... -_."..--- -'- ....-.--+------ ----- .. .... ".,.............._.--, --,

Bellingham CO Ib/hr Shutdown Emission Rates

. Unit 1 & 2 CO Ib/hr

500 Ib/hr shutdown limit= 1000 Ib/hr over a period

450

400 Shutdowns Associated Cold Startups

-M...350

"i 300 January - April 2007

:9 250 Shutdowns

200 Iblhr steady state limit plant total 132 Ib/hr

m_­150

o_- "0'_"'100

_m._..._-­