SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 260.41b - DEFINITIONS
(Rev. Effective 9-21-93)

As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in Subpart A of this Regulation.

(a) "Annual Capacity Factor" means the ratio between the actual heat input to a steam generating unit from the fuels listed in Rules 260.42b(a), 260.43b(a), or 260.44b(a), as applicable, during a calendar year and the potential heat input to the steam generating unit had it been operated for 8,760 hours during a calendar year at the maximum steady state design heat input capacity. In the case of steam generating units that are rented or leased, the actual heat input shall be determined based on the combined heat input from all operations of the affected facility in a calendar year.

(b) "Byproduct/Waste" means any liquid or gaseous substance produced at chemical manufacturing plants or petroleum refineries (except natural gas, distillate oil, or residual oil) and combusted in a steam generating unit for heat recovery or for disposal. Gaseous substances with carbon dioxide levels greater than 50 percent or carbon monoxide levels greater than 10 percent are not byproduct/waste for the purposes of this subpart.

(c) "Chemical Manufacturing Plants" means industrial plants which are classified by the Department of Commerce under Standard Industrial Classification (SIC) Code 28.

(d) "Coal" means all solid fuels classified as anthracite, bituminous, subbituminous, or lignite by the American Society of Testing and Materials in ASTM D388-77, Standard Specification for Classification of Coals by Rank (incorporated by reference (IBR) - 40 CFR, see Section 60.17) coal refuse and petroleum coke. Coal-derived synthetic fuels, including but not limited to solvent refined coal, gasified coal, coal-oil mixtures and coal-water mixtures, are also included in this definition for the purpose of this subpart.

(e) "Coal Refuse" means any byproduct of coal mining or coal cleaning operations with an ash content greater than 50 percent, by weight, and a heating value less than 13,900 kJ/kg (6,000 BTU/lb) on a dry basis.

(f) "Combined Cycle System" means a system in which a separate source, such as a gas turbine, internal combustion engine, kiln, etc., provides exhaust gas to a heat recovery steam generating unit.

(g) "Conventional Technology" means wet flue gas desulfurization (FGD) technology, dry FGD technology, atmospheric fluidized bed combustion technology, and oil hydrodesulfurization technology.

(h) "Distillate Oil" means fuel oils which contain 0.05 weight percent nitrogen or less and comply with the specifications for fuel oils number 1 and 2, as defined by the American Society of Testing and Materials in ASTM D396-78, Standard Specifications for Fuel Oil (IBR - see 40 CFR, Section 60.17).

(i) "Dry Flue Gas Desulfurization Technology" means a sulfur dioxide control system that is located downstream of the steam generating unit and removes sulfur oxides from the combustion gases of the steam generating unit by contacting the combustion gases with an alkaline slurry or solution and forming a dry powder material. This definition includes devices where the dry powder material is subsequently converted to another form. Alkaline slurries or solutions used in dry flue gas desulfurization technology include but are not limited to lime and sodium.

(j) "Duct Burner" means a device that combusts fuel and which is placed in the exhaust duct from another source, such as a stationary gas turbine, internal combustion engine, kiln, etc., to allow the firing of additional fuel to heat the exhaust gases before the exhaust gases enter a heat recovery steam generating unit.

(k) "Emerging Technology" means any sulfur dioxide control system that is not defined as a conventional technology under this rule, and for which the owner or operator of the facility has applied to the Administrator and received approval to operate as an emerging technology under Rule 260.49b(a)(4).

(l) "Federally Enforceable" means all limitations and conditions which are enforceable by the Administrator or the Control Officer including those requirements developed pursuant to 40 CFR Parts 60 and 61, requirements within any applicable State Implementation Plan, and any permit requirements established pursuant to 40 CFR 51.18 and 40 CFR 51.24.

(m) "Fluidized Bed Combustion Technology" means combustion of fuel in a bed or series of beds (including but not limited to bubbling bed units and circulating bed units) of limestone aggregate (or other sorbent materials) in which these materials are forced upward by the flow of combustions air and the gaseous products of combustion.

(n) "Fuel Pretreatment" means a process that removes a portion of the sulfur in a fuel before combustion of the fuel in a steam generating unit.

(o) "Full Capacity" means operation of the steam generating unit at 90 percent or more of the maximum steady state design heat input capacity.

(p) "Heat Input" means heat derived from combustion of fuel in a steam generating unit and does not include the heat input from preheated combustion air, recirculated flue gases, or exhaust gases from other sources, such as gas turbines, internal combustion engines, kilns, etc.

(q) "Heat Release Rate" means the steam generating unit design heat input capacity (in MW or BTU/hour) divided by the furnace volume (in cubic meters or cubic feet); the furnace volume is that volume bounded by the front furnace wall where the burner is located, the furnace side waterwall, and extending to the level just below or in from of the first row of convection pass tubes.

(r) "Heat Transfer Medium" means any material which is used to transfer heat from one point to another point.

(s) "High Heat Release Rate" means a heat release rate greater than 730,000 J/sec-m3 (70,000 BTU/hour-ft3).

(t) "Lignite" means a type of coal classified as lignite A or lignite B by the American Society of Testing and Materials in ASTM D388-77, Standard Specification for Classification of Coals by Rank (IBR see 40 CFR, Section 60.17).

(u) "Low Heat Release Rate" means a heat release rate of 730,000 J/sec-m3 (70,000 BTU/hour-ft3) or less.

(v) "Mass-Feed Stoker Steam Generating Unit" means a steam generating unit where solid fuel is introduced directly into a retort or is fed directly onto a grate where it is combusted.

(w) "Maximum Heat Input Capacity" means the ability of a steam generating unit to combust a stated maximum amount of fuel on a steady state basis, as determined by the physical design and characteristics of the steam generating unit.

(x) "Municipal-Type Solid Waste" means refuse, more than 50 percent of which is waste consisting of a mixture of paper, wood, yard wastes, food wastes, plastics, leather, rubber, and other combustible materials, and noncombustible materials such as glass and rock.

(y) "Natural Gas" means (1) a naturally occurring mixture of hydrocarbon and nonhydrocarbon gases found in geologic formations beneath the earth's surface, of which the principal constituent is methane or (2) liquid petroleum gas, as defined by the American Society for Testing and Materials in ASTM D1835-82, "Standard Specification for Liquid Petroleum Gases" (IBR - see 40 CFR, Section 60.17).

(z) "Noncontinental Area" means the State of Hawaii, the Virgin-Islands, Guam, American Samoa, the Commonwealth of Puerto Rico, or the Northern Mariana Islands.

(aa) "Oil" means crude oil or petroleum or a liquid fuel derived from crude oil or petroleum, including distillate and residual oil.

(bb) "Petroleum Refinery" means industrial plants which are classified by the Department of Commerce under Standard Industrial Classification (SIC), Code 29.

(cc) "Potential Sulfur Dioxide Emission Rate" means the theoretical sulfur dioxide emissions (nanograms per joule, lbs/million BTU heat input) that would result from combusting fuel in an uncleaned state and without using emission control systems.

(dd) "Process Heater" means a device which is primarily used to heat a material to initiate or promote a chemical reaction in which the material participates as a reactant or catalyst.

(ee) "Pulverized Coal-Fired Steam Generating Unit" means a steam generating unit in which pulverized coal is introduced into an air stream that carries the coal to the combustion chamber of the steam generating unit where it is fired in suspension. This includes both conventional pulverized coal-fired and micropulverized coal-fired steam generating units.

(ff) "Residual Oil" means crude oil, fuel oils numbers 1 and 2 which have a nitrogen content of greater than 0.05 weight percent, and all fuel oils number 4, 5 and 6, as defined by the American Society of Testing and Materials in ASTM D396-78, Standard Specifications for Fuel Oils (IBR - 40 CFR, Section 60.17).

(gg) "Spreader Stoker Steam Generating Unit" means a steam generating unit in which solid fuel is introduced to the combustion zone by a mechanism that throws the fuel onto a grate from above. Combustion takes place both in suspension and on the grate.

(hh) "Steam Generating Unit" means a device which combusts any fuel or byproduct/ waste to produce steam or to heat water or any other heat transfer medium. This term includes any municipal-type solid waste incinerator with a heat recovery steam generating unit or any steam generating unit which combusts fuel and is part of a cogeneration system or a combined cycle system. This term does not include process heaters as they are defined in this subpart.

(ii) "Steam Generating Unit Operating Day" means a 24-hour period between 12:00 midnight and the following midnight during which any fuel is combusted at any time in the steam generating unit. It is not necessary for fuel to be combusted continuously for the entire 24-hour period.

(jj) "Low Sulfur Oil" means an oil that contains no more than 0.5 weight percent sulfur or that, when combusted without sulfur dioxide emission control, has a sulfur dioxide emission rate equal to or less than 215 nanograms per joule (0.5 lb/million BTU) heat input. (Rev. Effective 9-21-93)

(kk) "Wet Flue Gas Desulfurization Technology" means a sulfur dioxide control system that is located downstream of the steam generating unit and removes sulfur oxides from the combustion gases of the steam generating by contacting the combustion gas with an alkaline slurry or solution and forming a liquid material. This definition applies to devices where the aqueous liquid material product of this contact is subsequently converted to other forms. Alkaline reagents used in wet flue gas desulfurization technology include, but are not limited to, lime, limestone and sodium.

(ll) "Wet Scrubber System" means any emission control device which mixes an aqueous stream or slurry with the exhaust gases from a steam generating unit to control emissions of particulate matter or sulfur dioxide.

(mm) "Wood" means wood, wood residue, bark, or any derivative fuel or residue thereof, in any form, including, but not limited to, sawdust, sanderdust, wood chips, scraps, slabs, millings, shavings, and processed pellets made from wood or other forest residues.