Code of Maryland Regulations › Title 26 - DEPARTMENT OF ENVIRONMENT › Part 2 - SUBTITLES 08-12 › Subtitle 11 - AIR QUALITY › Chapter 26.11.14 - Control of Emissions from Kraft Pulp Mills › Section 26.11.14.01 - Definitions

Current through Register Vol. 51, No. 14, July 12, 2024
A. In this chapter,
				  the following terms have the meanings indicated.
B. Terms Defined.
(1) "Brown stock washer" means an
				  installation that removes spent cooking liquor from raw pulp to maximize
				  chemical recovery and minimize carry over of cooking liquor into the bleaching
				  plant.
(2) "Black liquor" means a
				  combination of spent "cooking liquor" (water solution of sodium sulfate and
				  sodium hydroxide) and pulp wash water containing dissolved wood compounds which
				  is the byproduct of cooking wood chips at an elevated temperature and
				  pressure.
(3) "Clean condensates"
				  means all condensates from the pulp mill and evaporators that are not
				  specifically identified in the definition of "foul condensates," including the
				  condensates which have been processed through a condensate stripper to remove
				  90 percent or more of the VOC contaminants.
(4) "Combusted" means burned in a boiler or
				  thermal oxidizer with a minimal temperature of 1,200°F and a residence time not
				  less than 0.5 seconds or in a flare.
(5) "Condensate" means condensed process
				  steam from the digester and evaporator areas that contain VOCs and other
				  process chemicals, including both foul and clean condensates.
(6) "Condensate steam stripper" means a
				  multi-stage distillation unit that uses steam to remove organics and TRS
				  compounds from process condensate streams.
(7) "Digester" means an installation that
				  uses cooking chemicals and heat to separate fiber from other organics in wood
				  chips.
(8) "Digester blow tank
				  system" means all the process equipment, including accumulators and condensers,
				  used to separate the cooked pulp and spent cooking liquor from non-condensable
				  gases and condensates.
(8-1) "Evaporator" means equipment that is used primarily
					 to increase the solids content of spent cooking liquor from the pulp washing
					 systems.
(9) "Foul
				  condensates" means condensed process steam from the digester blow tank systems
				  and the primary and secondary condensates generated from the evaporator effect
				  when liquor is introduced.
(10)
				  "Knotters" means a mechanical device used to separate uncooked knots from the
				  pulp and spent cooking liquor mixture prior to brownstock washing.
(11) "Kraft pulp mill" means a group of
				  installations which use an alkaline sulfide solution containing sodium
				  hydroxide and sodium sulfide for a cooking liquor in its wood pulping
				  process.
(12) "Oven-dried pulp
				  (ODP)" means oven-dried, unbleached kraft pulp.
(12-1) "Recovery boiler" means an enclosed combustion
					 device in which concentrated spent liquor is burned to:
(a) Recover sodium and sulfides;
(b) Dispose of unwanted dissolved wood
				  components; and
(c) Generate
				  steam.
(13) "Smelt
				  dissolving tank" means an installation that processes the fluid discharge from
				  a recovery boiler.
(14) "Total
				  reduced sulfur (TRS)" means any compound of sulfur in a reduced state
				  discharged from a kraft pulp mill consisting primarily of hydrogen sulfide,
				  methyl mercaptan, dimethyl sulfide, and dimethyl disulfide.