Wisconsin Administrative Code › Department of Natural Resources › NR 400-499 - Environmental Protection - Air Pollution Control › Chapter NR 464 - National emission standards for hazardous air pollutants from the pulp and paper industry › Section NR 464.02 - Definitions

Current through June 24, 2024
For terms not defined in this section, the definitions
				  contained in chs.
				  NR
				  400 and
				  460 apply to the terms used in
				  this chapter, with definitions in ch. NR 460 taking priority over definitions
				  in ch. NR 400. In addition, the definitions in this section apply to the terms
				  used in this chapter. If this section defines a term which is also defined in
				  ch. NR 400 or 460, the definition in this section applies in this chapter. In
				  this chapter:
(1) "Acid condensate
				storage tank" means any storage tank containing cooking acid following the
				sulfur dioxide gas fortification process.
(2) "Black liquor" means spent cooking liquor
				that has been separated from the pulp produced by the kraft, soda or
				semi-chemical pulping process.
(3)
				"Bleaching" means brightening of pulp by the addition of oxidizing chemicals or
				reducing chemicals.
(4) "Bleaching
				line" means a group of bleaching stages arranged in series such that bleaching
				of the pulp progresses as the pulp moves from one stage to the next.
(5) "Bleaching stage" means all process
				equipment associated with a discrete step of chemical application and removal
				in the bleaching process including chemical and steam mixers, bleaching towers,
				washers, seal (filtrate) tanks, vacuum pumps, and any other equipment serving
				the same function as those previously listed.
(6) "Bleaching system" means all process
				equipment after high-density pulp storage prior to the first application of
				oxidizing chemicals or reducing chemicals following the pulping system, up to
				and including the final bleaching stage.
(7) "Boiler" means any enclosed combustion
				device that extracts useful energy in the form of steam. A boiler is not
				considered a thermal oxidizer.
(8)
				"Chip steamer" means a vessel used for the purpose of preheating or pretreating
				wood chips prior to the digester, using flash steam from the digester or live
				steam.
(9) "Closed-vent system"
				means a system that is not open to the atmosphere and is composed of piping,
				ductwork, connections and, if necessary, flow-inducing devices that transport
				gas or vapor from an emission point to a control device.
(10) "Combustion device" means an individual
				unit of equipment, including but not limited to, a thermal oxidizer, lime kiln,
				recovery furnace, process heater or boiler, used for the thermal oxidation of
				organic hazardous air pollutant vapors.
(11) "Day" means any 24 hour period
				corresponding to either midnight to midnight or to the actual 24 hour
				production day used by a specific facility.
(12) "Decker system" means all equipment used
				to thicken the pulp slurry or reduce its liquid content after the pulp washing
				system and prior to high-density pulp storage. The decker system includes
				decker vents, filtrate tanks, associated vacuum pumps, and any other equipment
				serving the same function as those previously listed.
(13) "Digester system" means each continuous
				digester or each batch digester used for the chemical treatment of wood or
				non-wood fibers. The digester system equipment includes associated flash tanks,
				blow tanks, chip steamers not using live steam, blow heat recovery
				accumulators, relief gas condensers, prehydrolysis units preceding the pulp
				washing system, and any other equipment serving the same function as those
				previously listed. The digester system includes any of the liquid streams or
				condensates associated with batch or continuous digester relief, blow or flash
				steam processes.
(14) "Emission
				point" means any part of a stationary source that emits hazardous air
				pollutants regulated under this chapter, including emissions from individual
				process vents, stacks, open pieces of process equipment, equipment leaks,
				wastewater and condensate collection and treatment system units, and those
				emissions that could reasonably be conveyed through a stack, chimney or duct
				where such emissions first reach the environment.
(15) "Evaporator system" means all equipment
				associated with increasing the solids content or concentrating spent cooking
				liquor from the pulp washing system including pre-evaporators, multi-effect
				evaporators, concentrators and vacuum systems, as well as associated
				condensers, hotwells and condensate streams, and any other equipment serving
				the same function as those previously listed.
(16) "Flow indicator" means any device that
				indicates gas or liquid flow in an enclosed system.
(17) "High volume, low concentration
				collection system" or "HVLC collection system" means the gas collection and
				transport system used to convey gases from the HVLC system to a control
				device.
(18) "High volume, low
				concentration system" or "HVLC system" means the collection of equipment
				including the pulp washing, knotter, screen, decker and oxygen delignification
				systems, weak liquor storage tanks and any other equipment serving the same
				function as those previously listed.
(19) "Knotter system" means equipment where
				knots, oversized material or pieces of uncooked wood are removed from the pulp
				slurry after the digester system and prior to the pulp washing system. The
				knotter system equipment includes the knotter, knot drainer tanks, ancillary
				tanks and any other equipment serving the same function as those previously
				listed.
(20) "Kraft pulping" means
				a chemical pulping process that uses a mixture of sodium hydroxide and sodium
				sulfide as the cooking liquor.
(21)
				"Lime kiln" means an enclosed combustion device used to calcine lime mud, which
				consists primarily of calcium carbonate, into calcium oxide.
(22) "Low volume, high concentration
				collection system" or "LVHC collection system" means the gas collection and
				transport system used to convey gases from the LVHC system to a control
				device.
(23) "Low volume, high
				concentration system" or "LVHC system" means the collection of equipment
				including the digester, turpentine recovery, evaporator, steam stripper systems
				and any other equipment serving the same function as those previously
				listed.
(24) "Mechanical pulping"
				means a pulping process that only uses mechanical and thermo-mechanical
				processes to reduce wood to a fibrous mass. The mechanical pulping processes
				include, but are not limited to, stone groundwood, pressurized groundwood,
				refiner mechanical, thermal refiner mechanical, thermo-mechanical and tandem
				thermo-mechanical.
(25) "Non-wood
				pulping" means the production of pulp from fiber sources other than trees. The
				non-wood fiber sources include, but are not limited to, bagasse, cereal straw,
				cotton, flax straw, hemp, jute, kenaf and leaf fibers.
(26) "Oven-dried pulp" or "ODP" means a pulp
				sample at zero percent moisture content by weight.
(a) Pulp samples for applicability or
				compliance determinations for both the pulping and bleaching systems shall be
				unbleached pulp.
(b) For purposes
				of complying with mass emission limits in this chapter, megagram of ODP shall
				be measured to represent the amount of pulp entering and processed by the
				equipment system under the specified mass limit.
(c) For equipment that does not process pulp,
				megagram of ODP shall be measured to represent the amount of pulp that was
				processed to produce the gas and liquid streams.