Workshop L Clean Air Act Challenges Air Pollution Control - - PDF document

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Workshop L Clean Air Act Challenges Air Pollution Control - - PDF document

Workshop L Clean Air Act Challenges Air Pollution Control Identify, Operate and Optimize for EPA Compliance, Operational Flexibility, Operating Cost and Troubleshooting Tuesday, March 26, 2019 11:15 a.m. to 12:30 p.m. Biographical


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SLIDE 1

Workshop L

Clean Air Act Challenges … Air Pollution Control …Identify, Operate and Optimize for EPA Compliance, Operational Flexibility, Operating Cost and Troubleshooting

Tuesday, March 26, 2019 11:15 a.m. to 12:30 p.m.

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SLIDE 2

Biographical Information

Micah S. Garrabrant, Senior Mechanical Engineer at the BOF AK Steel Corporation, 1801 Crawford St., Middletown, OH 45044 513-425-6258 Fax: 513-425-3867 Micah.Garrabrant@Aksteel.com Micah started his career as a Co-op student at the Steelmaking shop at AK Steel Middletown Works in 2008. Micah then hired on as the Baghouse Day Manager at the Basic Oxygen Furnace (BOF) in 2009 where his primary responsibility was managing the maintenance and compliance of the Title V permit at approximately 7 different baghouses at the BOF. Micah then progressed as the Water Treatment Day Manager at the BOF in 2011 where again he was responsible for maintenance and compliance with the water permit and stack testing. In 2013 Micah progressed into the Junior Mechanical Engineer position at the BOF and in 2018 progressed into the Senior Mechanical Engineer position where responsibilities included maintaining all of the equipment in the shop and still being closely associated with the Environmental aspects of the BOF. Micah is a graduate of Wright State University with a B.S. in Mechanical Engineering. Arnie T. Beringer, Owner & Managing Partner CEECO Equipment, Inc., Cincinnati, OH 513-709-8444 Fax: 513-672-0045 aberinger@ceecoequipment.com WWW.CEECOEQUIPMENT.COM Arnie began his career as an intern for the Ohio EPA (RAPCA) while he was attending the University of Dayton pursuing a Degree in Environmental Engineering. After spending an additional year with Ohio EPA after graduation, Arnie worked as an environmental engineer for Navistar for approximately 3 years in both their Springfield and Columbus

  • Operations. After Navistar, Arnie took the environmental manager position at Sun

Chemical at their pigment plant operation in Cincinnati. For the next 16 years he had various plant and regional EHS management positions and last served as the Corporate EHS Compliance Assurance Manager for the North American operations for Sun Chemical. In May of 2011 he left Sun Chemical to take over the family business, CEECO Equipment, as a manufacturer’s sales representative specializing in air pollution control and process equipment solutions. Arnie is a longtime member of the Air & Waste Management Association where he has served as the President of the Southwest Ohio Chapter on 3 separate occasions including currently.

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SLIDE 3

Biographical Information

Ron Hawks, Process Engineering Manager and a Principle QSEM Solutions, Inc. (A Trinity Consultants Company) 919-848-4003 rhawks@qsemsolutions.com

  • Mr. Hawks is expert in the evaluation, operation, and maintenance of air control systems

including capture hooding, ducting systems, scrubbers, fabric filters, electrostatic precipitators, and afterburners. He has conducted numerous internal inspections of equipment and consults regularly on system performance with industrial clients across the US. His intense knowledge of the processes within steel, coke, lime, chemical, and cement facilities, among others facilitates insight into the interaction between the processes and collection systems. His process, mechanical and collection system understanding often provides a clear path to mitigate air compliance issues driven by these complex interactions.

  • Mr. Hawks has completed several control equipment evaluations and upgrades at

integrated steel mills and mini-mills, coke batteries, cement facilities, and other industries to achieve compliance with their air requirements. His experience includes thermal systems such as afterburners, RTO’s, Cement kilns, Lime kilns, abatement systems, industrial process evaluations, and other air pollution control systems.

  • Mr. Hawks holds an M.M.E. in Mechanical Engineering, a B.S. in Chemistry, and a B.S.

in Aerospace Engineering, and has authored many papers on these subjects through the A&WMA and IEEE, among others.

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SLIDE 4
  • L. Clean Air Act Challenges: Air Pollution Control …

Identify, Operate and Optimize for EPA Compliance, Operational Flexibility, Operating Cost and Troubleshooting

Arnie T. Beringer – CEECO EQUIPMENT, Inc aberinger@ceecoequipment.com 513-709-8444 Ron Hawks – QSEM Solutions, Inc. (A Trinity Consultants Company) rhawks@qsemsolutions.com 919-848-4003 Micah Garrabrant – AK Steel Micah.Garrabrant@aksteel.com

1

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SLIDE 5

Air Pollution Control Technologies

  • Particulate Matter (PM)

– Dust Collectors – Scrubbers – Electro Static Precipitators (ESP, WESP)

  • Acid Gases, NOx, SOx

– Scrubbers – Dry Sorbent Injection (DSI) – SNCR, SCR

2

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SLIDE 6

Air Pollution Control Technologies

  • Volatile Organic Compounds (VOC)

– Scrubbers (Not very common) – Thermal Oxidation (Incinerator) – Regenerative Thermal Oxidizer (RTO) – Catalytic Thermal Oxidizer (CTO) – Carbon Adsorption – VOC Concentrator

3

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SLIDE 7

Fabric Filter Technology

Reverse Air

  • Negative Pressure
  • Positive Pressure

Pulse Jet

  • High Pressure Pulse
  • Medium Pressure Pulse
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SLIDE 8

Reverse Air Baghouses

https://youtu.be/4EyJX6JzBQ0

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SLIDE 9

1,000,000 ACFM Reverse Air Baghouse EAF Steel System (Ohio)

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SLIDE 10

Reverse Air Baghouse

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SLIDE 11

 High Pressure Pulse Jet Filters

  • Filter bags typically 6” diameter, and range up to 20 ft in length
  • Pulse Header pressure regulated from 65 – 90 psig depending on

filter bag material

  • Right angle pulse valves 1-1/2” to 2-1/2”

 Medium Pressure Pulse Jet Filters

  • Filter bags typically 5” diameter, and 26-32 ft in length
  • Pulse Header pressure regulated from 35 – 50 psig depending on

filter bag material

  • Immersion pulse valves 3” to 4”
  • Used on large flow systems saving on footprint requirement at

jobsites – Typical Utility Applications

PULSE JET FABRIC FILTERS

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SLIDE 12

Pulse Jet Fabric Filter Design (<20’ bags)

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SLIDE 13

Walk-in Plenum or Roof Door Access SIDE INLET WITH DUAL DIRECTION BAFFLE

Side Dual Inlet Design for Long Bags (>20 ft)

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SLIDE 14

25-35 psig

Cleaning System for Intermediate Pressure Pulse Jet

BALANCED FORCE BLOWTUBE SYSTEM

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Orifice Position Relativ e Pulse Force

Fixed Orifice Size Variable Orifice Sizes

Pt = ½ pV2 + Ps

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SLIDE 15

Typical Filter bag options

Material Type

  • Max. temp.

Removal Chemical Bag-life Relative Oper./upset performance Resistance Cost Fiberglass woven 500/525°F Good A 2-3 years 1.0 Fiberglass woven 500/525°F Excellent A 3-4 years 2.5 w/ ePTFE membrane PPS (Ryton felt 375/425°F Very good A 4 years 1.5 / Procon) Aramid felt 385/425°F Very good C 3 years 1.6 (Nomex) P-84 felt 400/450°F Very good B 3 years 2.0 Chemical Resistance Code: A = Very Good B = Good C = Fair

Pulse Jet Baghouse Design

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Cages – 10 wire vs. 20 wire

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Filter Bag Installation

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Computational Fluid Dynamics (CFD)

 CFD Studies are performed on Baghouse System Projects with the

following steps:

 Preliminary flow distribution design (based on previous

experience)

 CFD Analysis and feedback of preliminary design  Adjustment to design based on CFD feedback  CFD Analysis and feedback on revised design  Final review of CFD by Amerair, Galletta, and Lodge  Confirm design and start procurement

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Pulse Jet Baghouse Photos

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Sample view of Roof-top door Project

B&W CFB Project Arkansas River Power 224,604 ACFM @ 303°F

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Pulse Jet Baghouse – 435,000 acfm from a CFB Colver, PA 435,000 ACFM @ 330°F

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SLIDE 24

Pulse Jet Baghouse - 442,000 ACFM from CFB

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Biomass Project – Aiken, SC

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Dry Sorbent Injection (DSI)

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SLIDE 27

Lime Trona SBC

Carbon and Sorbent Injection Process Flow

x

PAC B-PAC

Injection Grid

  • 50% to 80% SO2 Removal
  • 95+% SO3 Removal
  • 98% HCl Removal
  • Hg to 1.2 lb/TBTU

FF or ESP

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SLIDE 28

Activated Carbon Injection (ACI)

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Semi-Dry Scrubber

 The Semi-Dry Scrubber treats Industrial or Utility process gas streams, removing:

  • Acid gases of
  • SO2
  • SO3
  • HCl
  • HF

 Uses alkali scrubbing media:

  • calcium hydroxide slurries
  • sodium-based solutions

 Used with downstream baghouse

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SLIDE 30

Contact us at: (610) 323-7670

Regenerative Thermal Oxidizers

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SLIDE 31

Contact us at: (610) 323-7670

Design Philosophy

– RTO – The RTO is sized for a specific SCFM (process flow) and thermal efficiency. Based upon the size of the RTO, ceramic heat recovery media is selected and

  • ptimum bed velocities are determined to achieve both

maximum destruction efficiency and minimal operating costs.

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SLIDE 32

Contact us at: (610) 323-7670

Design Philosophy

– Also, the RTO if evaluated and designed properly can be expanded with minor modification to areas such as different heat recovery media.

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SLIDE 33

Contact us at: (610) 323-7670

RTO Features

  • Lower fuel consumption
  • Lower Products of Combustion
  • Lower NOx emissions
  • More applicable to high volume gas flow with low solvent

concentrations (typically less than 3-5% LEL)

  • No supplemental fuel is required for inlet concentrations of

5% LEL or greater

  • System expandable
  • High VOC removal efficiency (up to 99%)
  • Flexible for types of VOC containment in inlet gas exhaust
  • High thermal efficiency of 95%
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SLIDE 34

Contact us at: (610) 323-7670

Gas Flow Through the RTO – Forced Draft

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SLIDE 35

Contact us at: (610) 323-7670

Gas Flow Through the RTO – Induced Draft

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SLIDE 36

Contact us at: (610) 323-7670

Regenerative Thermal Oxidization

The main factors affecting VOC removal efficiencies for RTO's are as follows:

– Oxidation conditions

  • Temperature
  • Retention time
  • Gas phase mixing

– Regenerator flow valving (leakage)

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SLIDE 37

Contact us at: (610) 323-7670

RTO Performance

  • Up to 99% destruction efficiency
  • Up to 95% thermal energy recovery
  • Less than 50 ppm CO at 1600F
  • 0.04 lbs NOx/MMBTU natural gas consumption
  • Low pressure, particulate tolerant heat recovery

media

  • Self-Cleaning Bake-Out Feature
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SLIDE 38

Contact us at: (610) 323-7670

Regenerative Thermal Oxidization

The residence time for most RTO systems range between 0.5 to 1.0 seconds and the oxidation temperature between 1500 degrees F to 2000 degrees

  • F. For 99% VOC destruction efficiency. The optimum
  • perating situation is residence time of 0.75 seconds

and oxidation temperature of approximately 1600 degrees F (for non-halogenated compounds).

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SLIDE 39

Contact us at: (610) 323-7670

Valve Housing and Cold Face Plenum

Access Door to Valve, ducts,cold face, and plenum Actuator and Solenoid Valve Hopper style cold face plenum:

  • Promotes even air

distribution across the media

  • Minimizes plenum

volume which increases destruction efficiency Inlet Manifold Outlet Manifold

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SLIDE 40

Contact us at: (610) 323-7670

Puff Capture Available

Includes additional valves, controls, timers and solenoids.

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SLIDE 41

Contact us at: (610) 323-7670

Large Hinged Access Doors

Standard Burner Chamber Access Poppet Valve Access

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SLIDE 42

Contact us at: (610) 323-7670

Large Hinged Access Doors

Allows entry and inspection of:

  • Entire Valve
  • Media Support
  • Cold side of Media
  • Inlet Manifold
  • Outlet Manifold
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SLIDE 43

Contact us at: (610) 323-7670

Heat Recovery Media

Experience With Varying Types Of Heat Recovery Media

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SLIDE 44

Contact us at: (610) 323-7670

25,000 SCFM RTO Skid Mounted design, minimizes space Achieved 99.6% DRE!

Regenerative Thermal Oxidizer

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SLIDE 45

Contact us at: (610) 323-7670

Design Philosophy

  • Catalytic TO/RCO –

– Chemistry is important – Precious metals catalyst – CFM is important. May be too costly at high flow

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SLIDE 46

Contact us at: (610) 323-7670

Design Philosophy

  • Catalytic TO/RCO –
  • Catalytic oxidizers are also excellent on CO.
  • Most economical at 1000-10,000 scfm due to the high

cost for catalyst.

  • 3-5 year catalyst life expectancy
  • Minimal flexibility with process variations and

susceptible to high temperature excursions.

  • Best for process streams with very clean and steady

VOC loadings.

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SLIDE 47

Contact us at: (610) 323-7670

Hyundai Catalytic Oxidizer

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SLIDE 48

Contact us at: (610) 323-7670

Recuperative Thermal Oxidizers – Gas Flow

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SLIDE 49

Contact us at: (610) 323-7670

Catalytic Oxidation (CAT OX)

A Catalytic Thermal Oxidizer (CAT OX)

  • Catalytic media to accelerate the oxidation of

VOC’s

  • Oxidation temperatures generally range from 500F

to 900F.

  • Most catalyst media comprise of platinum on an

alumina silica base. Halogenated compounds are generally prohibitive to catalyst life and efficiency.

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SLIDE 50

Contact us at: (610) 323-7670

CAT OX Design Criteria Continued

Important design parameters/variables for the successful

  • peration of a Catalytic Thermal Oxidizer are:
  • flow rates below 50 CFM and above 75,000 CFM are outside

the limits for available catalytic oxidation systems

  • maintain combustion temperatures of 600 - 800 degrees F
  • space velocity through catalyst media
  • type and concentrations of VOC's
  • pressure drop across catalyst media
  • effective catalyst life
  • materials of construction of heat exchanger
  • design of combustion chamber/catalyst bed
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SLIDE 51

Contact us at: (610) 323-7670

Direct-Fired Oxidizers

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SLIDE 52

Contact us at: (610) 323-7670

Zeolite Wheels with Thermal Oxidizer

Design Criteria Important design parameters for the design and

  • peration of a Zeolite Wheel system are as follows:
  • type and concentration of VOC's
  • adsorption media choice
  • face velocity on adsorption media
  • desorption time
  • turndown ration
  • materials of construction
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SLIDE 53

Session JJ – Process Design and Operating Principles for Venturi and Packed Bed Scrubbing

MEC Conference Sharonville, OH – March 26, 2019

  • Mr. Ronald Hawks, Process Manager/

Managing Consultant

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SLIDE 54

Scrubber Technology for Particulate

˃ Scrubber technology for particulate control

has not significantly changed since 1980’s-

 Particle capture  Droplet removal

˃ Methods of achieving the above have

changed-

 Better water introduction  Better demister technology

˃ System designs used by OEM’s have not

changed significantly

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Innovative Scrubber Advances

˃ Air/atomized and high pressure systems

to produce small droplets

˃ Ionized charging of water

droplet/particles to enhance capture

˃ Condensation to produce small aerosols

(nucleation Around particles)

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SLIDE 56

Configuration of a Venturi Scrubber

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SLIDE 57

Process Design Methodology for Wet Scrubbers

˃ Characterize Uncontrolled Particle

Emissions

˃ Define Required Control Efficiency

(% mass basis)

˃ Develop Design Considerations ˃ Determine Plant Constraints

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SLIDE 58

Design Considerations

˃ Particle capture mechanism

 Droplet size (um)  Static pressure (in wg)  Liquid gas ratio (L/G)

˃ Water droplet separation

 Mesh pad  Chevrons  Cyclonic separation

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SLIDE 59

Particle Capture

˃ The smaller the water droplet, the higher

the capture efficiency of submicron aerosols.

˃ Droplets can be created by-

 Shearing of sheet water (i.e. overflow weir)  Preformed spray nozzles (hydraulic pressure)  Air atomized nozzles

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SLIDE 60

Calculation of Scrubber Efficiency

˃ Johnstone equation ˃ Infinite throat model ˃ Cut power method ˃ Contact power theory ˃ Pressure drop

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SLIDE 61

Particle Interception by Droplet

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Removal Efficiency

0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 120 150 300 450 750 1000 1500 2000 3000

%

water droplet diameter um

10um 5um

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SLIDE 63

Pressure Drop

˃ ∆p=4X10-5(Vgt)2(L/G)

˃ ∆p=in H2O ˃ Vgt=throat velocity (ft./sec.) ˃ L/G=liquid to gas ratio (gal/1000 acfm)

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Saturated Gas Moisture

˃ % H2O at Saturation Dependent on Absolute

Pressure in the Scrubber (Pb-Ps) at a given Temperature

˃ % H2O at Saturation also Dependent on Gas

Composition (i.e. air vs. combustion gases)

˃ Why important?

 Water balance  Saturated Gas volume  Velocity thru demister

˃ Change in ambient barometer pressure

influences scrubber quenched gas moisture content

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Intangibles for Scrubber Operation

˃ Water Droplet Size Distribution ˃ Water Droplet Spatial Distribution in the

Scrubber Throat (eliminate donut holes)

˃ Spray Nozzle Orientation During nozzle

Installation

˃ Pre-Saturation of Gas before Scrubber

Throat

˃ Sub-micron Particle Generation from

Quench Sprays

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Water Droplet Carryover

˃ Failure to remove water droplets after

particle capture is the most significant impact on performance.

˃ Water droplets contain both suspended and

dissolved solids which evaporate before the Method 5 filter (248 +/- 250F) and particles are measured as filterable particulate.

˃ Impact of droplets can be determined by

comparing the measured moisture to the theoretical at the gas temperature and absolute pressure(lb/lb dry gas)

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Water Droplet Carryover

˃ The lower the allowed mass emission rate, the

more significant droplet carry over becomes.

˃ A completely dry demister outlet cannot be

achieved without fouling and eventual failure.

˃ Build-up of dissolved solids in recirculated

water can result in visible plumes (NaCl, KCl, NH4Cl2 solids) which form submicron aerosols when droplets evaporate in the atmosphere.

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Scrubber Technology for Gas Capture

˃ Packed bed counter-flow design ˃ Technology widely used in the chemical

industry for process and air pollution control

˃ Control based absorption of gas in water using

diffusion (i.e. mass transfer)

˃ Effectiveness determined by diffusion rate,

characteristics of pollutant, water/gas ratio and depth of packing

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SLIDE 69

Absorption principles

˃ Absorption determined by the height of the

mass transfer unit

˃ Number of transfer units determine the

removal efficiency

˃ Height of the transfer unit can be calculated

theoretically or determined empirically

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Variables affecting Height of transfer unit

˃ Liquor rate- lb./hr-ft2 ˃ Gas rate- lb./hr-ft2 ˃ Packing design/type ˃ Pollutant characteristics

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Scrubber water balance

˃ Once thru ˃ Recirculated with blow down ˃ Recirculated with blow down and

neutralization

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Empirical chart for height of transfer unit for HCl-Water

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SLIDE 73

Efficiency vs. number of transfer units

NTU % Removal efficiency 0.5 39.34 1.0 63.21 2.0 86.46 3.0 95.02 4.0 98.17 5.0 99.33

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Case study- Pickle line scrubber

˃ Pollutant HCl ˃ Water recirculated ˃ Water not neutralized ˃ Recirculation 192 gpm ˃ Blow down 10 gpm at pH of 0.45 ˃ Inlet gas volume 27,500 acfm at 122 oF

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SLIDE 75

Case study- pickle line scrubber (cont.)

˃ Theoretical removal 97.3% ˃ Number of transfer unit-4.17 ˃ Height of transfer unit-1.2 feet ˃ Demister velocity- 339 ft./min

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SLIDE 76

Initial test results

˃ HCl concentration-40 to 50 ppm ˃ Required HCl concentration-22 ppm ˃ Failure mechanisms

Deteriorated packing Demister failure/Water droplet carry over Acid mist penetration High inlet pollutant concentration due to elevated pickle bath temperature Final corrected concentration 2.5 ppm or 99.2 % removal

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SLIDE 77

Case study- Scrubber on BOF suppressed combustion vessel

˃ High energy venturi scrubber-75 in wg ˃ Gas quench section before venturi throat ˃ ID fan handling wet flue gases ˃ Inertial and Chevron demister

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SLIDE 78

Process operating characteristics

˃ Heat duration 20 minutes ˃ Conditions at fan inlet change constantly due

to progression of heat (volume, gas density, and temperature)

˃ Flue gases composition CO, CO2, N2, H2O ˃ Fraction of gases as CO2 expressed as

combustion factor (i.e. lambda)

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SLIDE 79

Fan handling wet gases after wet scrubber

˃ ID fan exhausting gases which are saturated

with water vapor

˃ Water vapor has a different density than air or

combustion gases (air-13.3 scf/lb, H2O- 21.38 scf/lb, combustion gases- 18.01 scf/lb)

˃ Higher the gas temperature, the higher the

water vapor content.

˃ As gas temperature increases the volume of

dry gas exhausted decreases from the process

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SLIDE 80

Saturated water vapor in air at 29.92 in Hg preassure

Temperature oF % moisture v/v % moisture lb/lb‐DA 70 2.46 0.0158 100 6.86 0.0459 150 25.36 0.2116 178 49.04 0.5992

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SLIDE 81

Vessel exhaust gas temperature

500 1000 1500 2000 2500 ‐ 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 F LAMBDA TIME

LAMBDA VS. OG TEMPERATURE

lambda 2 F

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SLIDE 82

Vessel Primary hood draft pressure

‐8 ‐6 ‐4 ‐2 2 4 ‐ 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 LAMBDA TIME

LAMBDA VS. HOOD DRAFT

lambda 2 in wg

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SLIDE 83

Vessel ID fan gas flow

‐ 10,000.00 20,000.00 30,000.00 40,000.00 50,000.00 60,000.00 70,000.00 ‐ 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 LAMBDA TIME

LAMBDA VS. ID FAN ACFM

lambda 2 ACFM

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SLIDE 84

Vessel ID fan gas density

0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.06 ‐ 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 LAMBDA TIME

LAMBDA VS. GAS DENSITY

lamdba 2 DENSITY

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SLIDE 85

Venturi differential pressure

69 70 71 72 73 74 75 76 77 78 79 ‐ 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000 18.000 20.000 LAMBDA TIME

LAMBDA VS. VENTURI DIFFERENTIAL

lamdba 2 DENSITY

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SLIDE 86

Useful Reference Documents

  • EPA 1452/B-02-001
  • Chapter 2, wet scrubber
  • Chapter 5, acid gas controls
  • Fan Engineering, Robinson Fans
  • Understanding Pyrometrics, 3rd edition, ASHRAE
  • Perry’s Chemical Engineers Handbook
  • Control Technologies for Hazardous Air Pollutants,

EPA/625/6-91/014

  • Industrial Ventilation, A Manual of Recommended

Practice for Design, 28th edition, ACGIH

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SLIDE 87

Thank You!! Questions or Additional Information:

Arnie Beringer, Owner, CEECO Equipment, Inc. aberinger@ceecoequipment.com 513-709-8444 www.ceecoequipment.com

Ron Hawks – QSEM Solutions, Inc. (A Trinity Consultants Company) rhawks@trinityconsultants.com 919-462-9693 919-500-9428 Micah Garrabrant – AK Steel Micah.Garrabrant@aksteel.com