NIPPON PAPER RO SYSTEM + 2 Others
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1 NIPPON PAPER RO SYSTEM + 2 Others 1 March 2014 Greg Wyrick District Account Manager John Zora District Account Manager
2 2 Purpose: Review the design, function, layout, and operation of the RO system. Process: minute presentation. Payoff: Gain a better understanding of the RO system
3 3 But First, What is RO? RO: Reverse Osmosis
4 Osmosis 4 Osmotic Head Semi- Permeable Membrane Strong Solution NaCl Na + Cl - H 2 O H 2 O H 2 O Pure Water Pure Water Flow
5 REVERSE OSMOSIS 5 Applied Pressure, P F > Osmotic Pressure, P O Semi- Permeable Membrane What is our applied pressure? Strong Solution (Mill Water) H 2 O H 2 O H 2 O Pure Water Pure Water Flow
6 6 WHY RO at Nippon? Old Boiler: 225 PSIG Zeolite Softened Water No Turbine Paper Mill Steam Use Cogen Boiler: 900 PSIG 20 MW Turbine Steam Extraction + Condensing
7 7
8 8 Why An RO and Not a DEMIN DEMINS: ACID and CAUSTIC Regen. Safety Concern Potential for silica, hardness breakthrough Potential for acid excursions Wide Range of flow rates RO s: Consistent Permeate Quality No acid or caustic regen system
9 Filter Plant Nippon Paper Cogen Boiler Pretreatment System Boiler Make-up Filters (3) MMF s Nalco 7408 Water Softeners (2) & Brine Tank PMP Injection Quill Local Sample Local Sample Local Sample Reverse Osmosis Units (2) Concentrate Mixed Bed Polisher Boiler Makeup Water Tank Nalco 1820 Qty: 2 RO Product Boiler Makeup Water Pumps (2) Boiler Makeup Water Heat Exchanger Process Condensate Qty: 4 Condensate Polisher (2) & Brine Tank Local Sample Local Sample Sample to Test Station Steam From Turbine Surface Condenser Steam Eductor System Final Inter Gland Steam Condenser Surface Condenser: Sample to Test Station To Vacuum Drain Flash Tank Surface Condenser Condensate Low Temp Heat Exchanger Condensing EconomizerSoot Blower Flue Gas Chamber: Condensate Surface Condenser Condensate High Temperature Heat Exchanger: # Steam Sample to Test Station Nalco Conquor CNQR3475 To BFW Pump
10 Basic Block Diagram of Water Flow Elwha River Treatment Plant Mill Filter Plant RO Water Treatment Building Storage Tank Deaerator BOILER Steam Turbine Cond. Cond. Polisher Paper Mill Cond.
11 Basic Block Diagram of RO TREATMENT BUILDING Round Tank Mill Water Booster Pump High Efficiency Filters Softeners RO s Mixed Bed Polishers Storage Tank
12 12 Booster Pump Mill water pressure variations Too low, RO kick out. Protect high pressure pump.
13 High Efficiency Filters 13
14 14 High Efficiency Filters Purpose: Remove un-dissolved solids Particles larger than 0.5 microns Process: Pass water through a high efficiency filter Payoff: Produce water of SDI less than 5 Minimize RO Fouling
15 15 UltraSand Plus High Efficiency Filter Standard Multi-Media Filter
16 microns microns Ions Proteins Viruses Ions Bacteria Proteins Sand Viruses Bacteria Bacteria Sand Sand Bacteria Sand 16 Coagulant Addition Coagulant Addition Std. Filtration Std. Filtration Coagulant added to increase 'application envelope'... Coagulant added to increase 'application envelope' HE Filtration HE Filtration Microfiltration Microfiltration Ultrafiltration Ultrafiltration Nanofiltration Nanofiltration Reverse Osmosis Reverse Osmosis
17 17 Top Over Bottom (TOB): Feed water enters and creates an area of turbulence over the bed and a tangential force that scrubs particles off the bed surface. The tangential force carries particles back toward the filter inlet. At the same time, this tangential force also pushes sand towards the filter inlet, creating a camel hump. Behind this hump is an area of low turbulence that allows for deposition of particles that have been scrubbed off of the sand. This low-turbulence area keeps filling with particles until spilling over the hump into the high-turbulence area of the filter.
18 18 Top Over Bottom (TOB): As particles begin to collect on the turbulent-side of the hump adds to the particle loading of the influent water. When the loading of solids in the feed water exceeds the capacity of the water to hold them, the particles begin to drop out on the filter bed, This increases the differential pressure through the bed, signaling time to backwash the filter. Filters are backwashed when the differential pressure reaches 15 psig. Ref: Pg. 12
19 This is all great, but the mill has a filter plant Why does it need a High Efficiency Filter 19 SDI SILT DENSITY INDEX
20 SDI Tester 20 Pressure Gauge Filter Holder, 0.45 micron, 47 mm
21 21
22 Silt Density Index 22 Measures Fouling potential of RO membranes with suspended solids. Higher the number, the greater the potential. Most membrane manufactures require an SDI below 5 for warranty.
23 23 SDI = 1 (t i/t f ) x 100 T Where: t i = initial time to fill to 500 ml t f = time after T to fill to 500 ml T = Time, usually 15 minutes.
24 BASELINE DATA COLLECTION 24 From October 2010 to September 2012 SDI were ran 14 times. Values ranged from Far too high for an RO Need to a high efficiency filter
25 PARTICLE SIZE DISTRIBUTION 25 Sample sent to a lab, analyze for particle counts and volumes with proscribed micron ranges. From October 2010 to October 2012, 20 samples sent in to establish baseline.
26 26
27 How Well Does the Filter Work 27 February 10, 2014 Effluent: SDI = 3.1 Influent: SDI = 18
28 October 2, Effluent SDI = 1.06 Influent SDI = 36
29 29 PSD Data Range, micron Particle % removal Volume % removal % 71% % 99% % % 99% % 99% % 99% Total n/a 99%
30 30 Operations All 3 run at a time. Booster pump starts when there is a call for water, ie level is make-up water tank. Backwash based on differential pressure. Automatically backwash in sequence once differential pressure is reached. Takes 8 minutes per unit.
31 Softeners 31 Purpose: Remove hardness. Process: Pass water over cation resin. Payoff: Protect RO from hardness based scale & no need to add an anti-scalant.
32 32 Operations 2 units: one in service; one standby Scavenge Chlorine out Run to a gallons throughput Auto switch Auto regenerate. Operators keep brine tank full of salt
33 RO 33
34 3 Basic Components 1. Prefilter - Red 2. Pump - Yellow 3. RO Membranes - Blue
35 35 Purpose: Remove dissolved ions and colloidal silica from water to condition water for use as boiler feed water. Process: Water is passed through a semi-permeable membrane. Payoff: Water is almost good enough for economical use as BFW. Last step is to pass through a mixed bed polisher.
36 2:1 Array System 84 gpm Permeate 126 gpm 84 gpm 42 gpm 42 gpm 168 gpm 42 gpm 84 gpm 84 gpm 42 gpm 42 gpm 42 gpm Concentrate to sewer 75% Recovery 25% Rejection
37 37
38 38
39 39
40 40
41 41
42 42 Feed spacer Permeate spacer Membrane leaf
43 As the feed water travels down the membrane(s), it becomes more concentrated: Brine becomes more concentrated Product Feed Concentrate
44 Pressure Vessel: Multi-Module Pressure Vessel- Product [Permeate] Feed Concentrate [Reject] Contains 1, 3, 4, 6, or 7 modules in series 44
45 TFC Membrane: 0.2 micron 40 micron 120 micron Flow always goes INTO the structure Polyamide Ultra-thin Barrier Layer Microporous Polysulfone Reinforcing Fabric REVERSE FLOW WILL LIFT THE MEMBRANE FROM THE BACKING 45
46 TFC Membrane 46 Polyamide Barrier Layer Polysulfone Backing Support Layer 46
47 47 Mixed Bed Polisher After RO Remove any ions (hardness, silica) that gets past the RO.
48 48 Mill Water: Silica: Ave. 6.8 ppm; low: 5.5, high % rejection from RO Silica in permeate = ppm Ave ppm Low 0.18 ppm High At 50 cycles: 6.8 ppm Ave. 5.5 ppm Low 9 ppm High Upper boiler limit for silica is 8 ppm
49 49 Silica: Ave. 6.8 ppm; low: 5.5, high % rejection from RO Silica in permeate = 0.34 ppm Ave ppm Low 0.45 ppm High At 50 cycles: 17 ppm Ave ppm Low 22.5 ppm High Upper boiler limit for silica is 8 ppm Can not run at 50 cycles. Have to increase blowdown and run at 23 cycles.
50 Control and Monitoring 50
51
52
53 Inhibitor Control ph ORP Temperature NTU Pressures Flow
54
55 Automated Tank Level and Usage Reporting
56
57
58 3DT for Membranes Equipment Automation Service 58 Chemicals & Consumables
59 Immediate Feedback of Problems Customer Notifications! 3DTTfM Monitoring
60 Cleaning at the right time Cleaning should have been done here Inneffective cleanings
61 Multiple data streams come into a central unit P P P us F P P us F FL T O ph Permeate Feed Water FL P Concentrate
62
63
64 Weekly Operations Report 64
65 Weekly Operations Report 65
66 THANK YOU! 66
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