PLACER COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 231 - INDUSTRIAL, INSTITUTIONAL, AND COMMERCIAL BOILERS, STEAM GENERATORS, AND PROCESS HEATERS
(Adopted 10-17-94; Amended 10-9-97)

100 GENERAL

101 PURPOSE: To limit the emission of Nitrogen Oxides (NOx) from industrial, institutional and commercial, boilers, steam generators and process heaters.

102 APPLICABILITY:

103 EXEMPTIONS:

200 DEFINITIONS

201 ANNUAL HEAT INPUT: The total heat input of fuels burned by a unit in a calendar year, as determined from the higher heating value and cumulative annual usage of each fuel.

202 BOILER OR STEAM GENERATOR: Any combustion equipment fired with any fuel and used to produce steam that is not used exclusively to produce electricity for sale.

203 BRITISH THERMAL UNIT (BTU): The amount of heat required to raise the temperature of one pound of water from 59F to 60F at one atmosphere.

204 GAS: Any fuel which is a gas at standard conditions.

205 HEAT INPUT: The chemical heat released due to fuel combustion in a unit, using the higher heating value of the fuel. This does not include the sensible heat of incoming combustion air.

206 HIGHER HEATING VALUE (HHV): The total heat liberated per mass of fuel burned (BTU per pound), when fuel and dry air at standard conditions undergo complete combustion and all resultant products are brought to their standard states at standard conditions. HHV shall be determined by one of the following test methods:

207 MUNICIPAL SOLID WASTE: Household, commercial/retail, and/or institutional waste. Household waste includes material discarded by single or multiple residential dwellings, hotels, motels, and other similar permanent or temporary housing establishments or facilities. Commercial/retail waste includes material discarded by stores, offices, restaurants, warehouses, nonmanufacturing activities at industrial facilities, and other similar establishments or facilities. Institutional waste includes material discarded by schools, hospitals, prisons, and government facilities and other similar establishments or facilities. Municipal solid waste does not include landfill gas or digester gas or other fuels derived from decomposition of municipal solid wastes.

208 NOX EMISSIONS (NOX): The sum of nitric oxides and nitrogen dioxide in the flue gas, collectively expressed as nitrogen dioxide (NO2).

209 NONGASEOUS FUEL: Any fuel which is not a gas at standard conditions.

210 PARTS PER MILLION BY VOLUME (PPMV): - The ratio of the number of gas molecules of a given species, or group, to the number of millions of total gas molecules.

211 PROCESS HEATER: Any combustion equipment fired with any fuel, and which transfers heat from combustion gases to water or process streams.

212 RATED HEAT INPUT CAPACITY: The heat input capacity, in million BTU per hour, specified on the nameplate of the combustion unit. If the combustion unit has been altered or modified such that its maximum heat input is different than the heat input capacity specified on the nameplate, the maximum heat input shall be considered as the rated heat input.

213 RESPONSIBLE OFFICIAL: An individual with the authority to certify that a source complies with all applicable requirements, including the conditions of permits issued to sources in accordance with Regulation 5, PERMITS. A "responsible official" means one of the following:

214 STANDARD CONDITIONS: For purposes of this rule, a gas temperature of 68 Fahrenheit and a gas pressure of 14.7 pounds per square inch absolute.

215 THERM: One hundred thousand (100,000) BTU.

216 UNIT: Any boiler, steam generator or process heater as defined in Sections 202 and 211.
 

300 STANDARDS

301 ANNUAL HEAT INPUTS 90,000 THERMS: For units with rated heat inputs of greater than or equal to 5 million BTU per hour and annual heat inputs of greater than or equal to 90,000 therms per year , NOx emissions shall not exceed the following levels:

302 ANNUAL HEAT INPUTS 90,000 THERMS: Units with rated heat inputs of greater than or equal to 5 million BTU per hour and annual heat inputs of less than 90,000 therms per

303 EQUIPMENT REQUIREMENTS:

 

400 ADMINISTRATIVE REQUIREMENTS

401 COMPLIANCE SCHEDULE

402 COMPLIANCE DETERMINATION:

403 COMPLIANCE COSTS: A person operating a unit subject to this rule shall bear all expenses associated with compliance with the monitoring and reporting provisions of this rule.

404 CERTIFICATION: All reports submitted in accordance with this rule shall be signed by a responsible official who shall certify the truth, accuracy, and completeness of the report.
 

500 MONITORING AND RECORDS

501 FUEL USAGE AND OPERATING HOURS

502 SOURCE TESTS

503 TUNING REPORTS: Units covered under Section 302.3 shall be tuned not less than once every 12 months. Tuning verification reports shall be submitted not less than once every 12 months for each fuel burned. The first tuning verification report shall be submitted by October 17, 1997, for non-Major Sources, and by May 31, 1995, for Major Sources subject to this rule.

504 RETENTION OF RECORDS: All records maintained pursuant to this rule shall be retained for at least three years from date of entry, with the exception that sources subject to the requirements of Rule 507, FEDERAL OPERATING PERMIT PROGRAM, shall retain records at least five years. Records shall be made available for inspection by the Air Pollution Control Officer upon request.
 

600 TUNING PROCEDURE
 

601 GENERAL: Nothing in this tuning procedure(1) shall be construed to require any act or omission that would result in unsafe conditions or would be in violation of any regulation or requirement established by Factory Mutual, Industrial Risk Insurors, National Fire Prevention Association, the California Department of Industrial Relations (Occupational Safety and Health Division), the Federal Occupational Safety and Health Administration, or other relevant regulations and requirements.

602 PROCEDURES:

 

Figure 1
Oxygen(O2)/CO Characteristic Curve

Source: KVB Inc.
 

Figure 2
Oxygen(O2)/Smoke Characteristic Curve

 

Source: KVB Inc.
 


  1. This tuning procedure is based on a procedure developed by KVB, Inc. for the U.S. EPA.
  2. The smoke-spot number can be determined with ASTM test method D-2156 or with the Bacharach method. The Bacharach method is included in a tune-up kit that can be purchased from the Bacharach Company.
  3. Typical minimum oxygen levels for units at high firing rates are:
    1. For natural gas: 0.5 - 3%
    2. For liquid fuels: 2 - 4%.