VENAPCD RULE 59 ELEC. POWER GENERAT. EQPT. - NOx EMIS.

LAST REVISED 04/01/93

Rule 59. Electrical Power Generating Equipment - Oxides of

Nitrogen Emissions (Adopted 10/6/69, Revised 5/23/72,

7/18/72, 10/31/72, 8/14/79, 12/7/82, 6/4/91, 9/15/92

effective 4/1/93)

A. Applicability

The provisions of this rule shall apply to utility electric

power generating steam boilers and any auxiliary boiler used

with a utility electric power generating steam boiler, owned

and/or operated by a municipality or a Public Utilities

Commission (PUC) regulated utility, and not subject to the

provisions of Rule 74.15.

B. Requirements

1. Prior to the final compliance dates specified in

Subsections B.2 and B.3, the owner or operator of an

existing electric power generating unit shall burn only

natural gas and shall limit oxides of nitrogen (NOx)

emissions to no more than the following:

Maximum Heat

Input Rate

(Gross): Gaseous Fuel

Greater Than

25 million BTU/Hr...............................250 ppm

2150 million BTU/Hr.............................125 ppm

Total NOx emissions from all applicable units shall not

exceed 4,460 tons per year.

2. Effective June 4, 1994, no person shall allow the

discharge into the atmosphere from any electric power

generating steam boiler, with a rated heat input capacity

of equal to, or greater than, two thousand one hundred

fifty (2150) million BTU's per hour, NOx emissions in

excess of 0.10 pounds per megawatt hour (MW-hr) produced

(net). Compliance shall be determined using a rolling 24

hour average.

3. Effective June 4, 1996, no person shall allow the

discharge into the atmosphere from any electric power

generating steam boiler, with a rated heat input capacity

of less than two thousand one hundred fifty (2150)

million BTU's per hour, NOx emissions in excess of 0.20

pounds per MW-hr produced (net). Compliance shall be

determined using a rolling 24 hour average.

4. Effective June 4, 1992, no person shall allow the

discharge into the atmosphere from any auxiliary boiler

NOx emissions in excess of 0.040 pounds per million BTU's

of fuel consumed. Applicable units shall test for

compliance not less than once each calendar year.

5. Effective April 1, 1993, operation on any amount of

fuel oil shall be prohibited, except as provided in

Subsection C.3.

6. The owner or operator of an applicable unit shall

submit for approval to the Air Pollution Control Officer

a plan for compliance with the provisions of Subsections

B.2, B.3, and B.4. The plan shall include:

a. A list of all units subject to the rule, including

the manufacturer, model number, and maximum rated

capacity for each unit.

b. A description of the NOx control system proposed

for each unit, including type and manufacturer, as

well as a description of any ancillary equipment

related to the control of emissions. Data on the

expected performance of the NOx control system shall

also be included.

c. A compliance schedule for each unit, including,

but not limited to, specific dates for the following

events: final engineering, contract award, begin

construction, complete construction, and final

compliance.

7. No person shall allow the discharge into the atmosphere

from any emission control device installed and operated

pursuant to the requirements of Subsections B.2, B.3 or

B.4 above, ammonia (NH3) emissions in excess of 10 ppmv.

8. On June 4, 1992, and biennially thereafter, the owner

or operator of electrical power generating equipment

shall provide revised NOx emission curves for each

boiler. The curves shall relate NOx emissions to load

(megawatts), fuel flow (BTUs) and the injection rate of

reactant chemicals (pounds), if appropriate.

C. Exemptions

1. The provisions of Subsections B.1, B.2, B.3 and B.7 of

this rule shall not apply during the cold start-up of an

applicable unit. For units with a rated heat input

capacity of equal to, or greater than, two thousand one

hundred fifty (2150) million BTU's per hour, the duration

of each start-up procedure shall not exceed twenty (20)

hours. For units with a rated heat input capacity of

less than two thousand one hundred fifty (2150) million

BTU's per hour, the duration of each start-up procedure

shall not exceed ten (10) hours.

2. The provisions of Subsection B.4 and B.7 of this rule

shall not apply during the cold start-up of an applicable

unit. The duration of each start-up procedure shall not

exceed one (1) hour.

3. The provisions of Subsections B.1, B.2, B.3 and B.5 of

this rule shall not apply during either a force majeure

natural gas curtailment, a fuel oil system test or an

emission test. Fuel oil system tests for all units shall

not exceed a total of 96 hours per year. Fuel oil

operation shall be subject to the following conditions:

a. When fuel oil is in use in any electric power

steam generating boiler prior to the final

compliance dates specified in Subsections B.2 or

B.3, NOx emissions shall not exceed the following:

Maximum Heat

Input Rate

(Gross): Liquid Fuel

Greater Than

25 million BTU/Hr..........................250 ppm

2150 million BTU/Hr........................225 ppm

Total NOx emissions from all applicable units shall

not exceed 4,460 tons per year.

b. When fuel oil is in use in any electric power

steam generating boiler after the final compliance

dates specified in Subsections B.2 or B.3, NOx

emissions shall not exceed the following:

1) When operated on 100 percent fuel oil, 0.33

pounds per megawatt hour (MW-hr) produced

(net).

2) When operated on a mixture of natural gas and

fuel oil, the rolling 24 hour average emission

limit calculated every hour from the sum of the

previous 24 hourly emission limits. The hourly

emission limit shall be determined from the

following equation:

[((0.33 lb/MW-hr)(Fo)(HFo))+((Lg)(Fg)(HFg))]

R = -------------------------------------------

B

Where R = Emission limit in pounds

per megawatt hour (MW-hr)

produced (net)

Lg = Emission limit for boiler as

specified in Subsection B.2 or B.3

(lb/MW-hr)

Fo = Rate of fuel oil used (gallons/hour)

Fg = Rate of natural gas used (cubic

feet/hour)

HFo = Heating value of fuel oil in

use (BTU/gallon)

HFg = Heating value of natural gas in

use (1050 BTU/cubic foot)

B = (Fo)(HFo)+(Fg)(HFg), or the

total energy input per hour (BTU/Hr)

The rolling 24 hour average emission limit shall be

calculated every hour as Rt/24, where Rt is the sum

of the previous 24 hourly emission limits R.

Compliance shall be determined using a rolling 24

hour average emission rate.

D. Recordkeeping Requirements

1. For those units subject to Subsection B.4, but not

subject to the provisions of Rule 103, permanent daily

records shall be maintained for a period of four (4)

years and shall be available for inspection by the Air

Pollution Control Officer upon request. The records

shall include, but are not limited to, type of fuel

burned, sulfur content of fuel burned, quantity of fuel

burned, and hours of operation.

2. Any unit exempt pursuant to the provisions of

Subsections C.1 and C.2 shall maintain permanent hourly

records of the cold startup procedure for a period of two

(2) years. Records shall be available for inspection by

the Air Pollution Control Officer upon request. The

records shall include, but are not limited to, type of

fuel burned, sulfur content of fuel burned, quantity of

fuel burned, gross and net energy production in megawatt

hours (MW-hr), and the duration of the procedure.

3. For those units subject to the provisions of

Subsections B.2 and B.3, permanent hourly records shall

be maintained for a period of four (4) years and shall be

available for inspection by the Air Pollution Control

Officer upon request. The records for each hour shall

include, but are not limited to, gross and net energy

production in megawatt hours (MW-hr), quantity of fuel

burned, the injection rate of reactant chemicals

(pounds), if appropriate, NOx emissions in pounds (lb),

the NOx emission rate in lb/MW-hr, and the rolling 24

hour average NOx emission rate.

E. Test Methods

1. For those units subject to Subsection B.4, but not

subject to the provisions of Rule 103, compliance with

the NOx emission requirements in Section B.4 shall be

determined using EPA Method 7E.

2. For those units subject to Subsection B.4, but not

subject to the provisions of Rule 103, emission tests

resulting in compliance determinations for the

requirements of Section B.4 shall be conducted on units

fired at maximum rated capacity, or as near thereto as

practicable.

3. The oxides of nitrogen (NOx) emission limitation

specified in Subsections B.1, B.2, B.3, B.4, C.3.a and

C.3.b are expressed as nitrogen dioxide. The limitations

in Subsections B.1, B.4, B.7 and C.3.a are referenced at

three (3) percent volume stack gas oxygen on a dry basis

averaged over 15 consecutive minutes. Stack gas oxygen

shall be measured using EPA Method 3A. The heating value

of fuel oil shall be measured using ASTM Method D 240-87.

4. Megawatt hours (MW-hr) produced (net), as required in

Subsections B.2 and B.3, shall be measured using a method

approved by the Air Pollution Control Officer. The

method shall be submitted by the owner or operator of an

electric power generating unit and shall include a

description of the principle of measurement and

calculation used to determine the megawatt hours (MW-hr)

produced (net). The method shall also include the

technique and procedures used to calibrate each

measurement device. Each measurement device shall be

calibrated against standards which are traceable to

either National Institute of Standards and Technology

(NIST) standards or a higher authority if no NIST

standards exist. The calibration accuracy tolerance of

each measurement device shall be (PLUS OR MINUS) 0.5

percent of all measured values.

5. The hourly calculations used to determine pounds per

MW-hr, as required in Subsections B.2, B.3 and C.3.b,

shall be done as follows:

a. The following equation shall be used to calculate

hourly NOx emissions in pounds for each applicable

unit:

n

E = [ e ] (1/n)

i=1 i

Where E = Average emission rate in

pounds per hour

ei = Emission rate measured in

consecutive five minute periods in

pounds per hour

n = Number of valid data points

during the hour

b. The following equation shall be used to

calculate hourly megawatt hour (MW-hr) produced

(net) for each applicable unit:

n

F = [ f ] (60/n)

i=1 i

Where F = Hourly MW-hr produced (net)

fi = MW-hr produced (net) per

consecutive minute

n = Number of valid data points

during the hour

c. For emission measurements, the number of

valid data points (n) per hour shall be no less

than 10. For MW-hr measurements, the number of

valid data points (n) per hour shall be no less

than 50.

6. The rolling 24 hour average, as specified in

Subsections B.2, B.3 and C.3.b, shall be calculated

every hour as (Et)/(Ft), where Et is the sum of the

previous 24 hourly average emission rates E and Ft is

the sum of the 24 corresponding hourly MW-hr produced

(net) calculations F, as specified in Subsection E.5.

If there are less than 24 consecutive valid entries

available for any 24 hour period, missing entries

shall be calculated using the NOx emission curves

specified in Subsection B.8. Data points in five

minute intervals shall be used to develop hourly

entries from NOx emission curves.

7. For those units subject to the ammonia emission

requirement in Subsection B.7, compliance shall be

determined using Bay Area Air Quality Management

District Method ST-1B, dated 1/20/82.

F. Violations

Failure to comply with any provision of this rule shall

constitute a violation of this rule.

G. Definitions

1. "Boiler": An individual piece of combustion

equipment fired with liquid and/or gaseous fuel and

used to produce steam.

2. "Cold startup procedure": The process of bringing a

boiler and the associated emission control device up

to operating temperature after the boiler and control

device have experienced zero fuel flow for a period

of time and are considered cold. A boiler and

control device shall be considered cold if the

temperature of the flue gas leaving the economizer

outlet is less than 550 degrees F.

3. "Force majeure natural gas curtailment": An

interruption in natural gas service, such that the

daily fuel needs of a boiler cannot be met with the

natural gas available, due to one of the following

reasons:

a. Unforeseeable failure or malfunction not

resulting from an intentional or negligent act

or omission on the part of the owner or

operator of a boiler, or natural disaster, or;

b. A supply restriction resulting from a

California Public Utilities Commission priority

allocation system.

4. "Heat Input": The chemical heat released due to

fuel combustion in a boiler, using the higher heating

value of the fuel. This does not include the

sensible heat of incoming combustion air.

5. "Megawatt hour (MW-hr) produced (net)": The

electricity produced according to the following

equation:

MW-hr = VI(cos u)

Where V = Voltage to the power grid (volt)

I = Current to the power grid (ampere)

cos u = Power factor

u = Phase angle

6. "Rated Heat Input Capacity": The heat input

capacity specified on the nameplate of the unit's

burner. If the burner has been permanently altered

or modified such that the maximum heat input is

different than the input capacity specified on the

nameplate, and this alteration or modification has

been approved in writing by the Air Pollution Control

Officer, then the new maximum heat input shall be

considered as the rated heat input capacity.

H. Increments of Progress

1. The owner or operator of an applicable unit shall

submit the plan specified in Subsection B.6 of this

rule to the Air Pollution Control Officer before June

4, 1992.

2. The owner or operator of an applicable unit shall

submit complete applications for the Authorities to

Construct required to install any equipment necessary

to comply with the provisions of Subsections B.2 and

B.3 of this rule to the Air Pollution Control Officer

before December 4, 1992.