general technical training for cemtec fgd-limestone grinding plants and equipments thereof
DESCRIPTION
General Technical Training for CEMTEC FGD-Limestone Grinding Plants and Equipments thereof. CEMTEC Cement and Mining Technology GmbH Ennshafenstrasse 40 4470 Enns, Austria T: +43 7223 83620 0 F: +43 7223 83620 333 E: [email protected]. F lue G as D esulfurization -Process. - PowerPoint PPT PresentationTRANSCRIPT
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FGD-Limestone Grinding PlantsGeneral Technical Training
MJ / 23.02.2009
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General Technical Trainingfor
CEMTECFGD-Limestone Grinding Plants
andEquipments thereof
CEMTECCement and Mining Technology GmbH
Ennshafenstrasse 404470 Enns, Austria
T: +43 7223 83620 0F: +43 7223 83620 333
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The FGD-limestone grinding plants are installed in coal fired power plants to prepare the „ready-for-use“ limestone-water-suspension. Pre-crushed limestone is milled in a closed wet grinding circuit and afterwards used to react with the flue gas to gypsum in the FGD-towers.
FlueGasDesulfurization-Process
pre crushed limestone
limestonegrinding
FGD-process
gypsumdewatering
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Typical General Layout (including control room layout)
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Turn-KeyPlant Layout(includingControl room)
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Main Equipments deliverable by CEMTEC-limestone transport and daily storage area including pre-crushing (if necessary)
-limestone dosing belts
-wet grinding mills including lubrication systems
-process water dosing by means of regulation valves
-limestone slurry tank (circulation tank after mill) including agitator
-slurry pump including additional stand-by pump (on demand)
-hydrocyclone clusters including stand-by cyclones (1 spare or more according demand)
-limestone slurry piping system including valves and distribution into limestone slurry storage tank (according detailed take over point requirements)
-process water piping according detailed take over point requirements
-instrumentation
-auxiliary media piping such as instrument air, purging water, cooling water etc.
-electrical equipment and control system (MCC, FCC, PLC according detailed project specification)
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Auxiliary Equipments deliverable by CEMTEC (on demand)-secondary structures as piping supports, maintenance
platforms and walkways
-sound deadening covers for ball mills
-grinding media filling devices
-grinding media sorting machine
-maintenance handling systems (e.g. monorail crane)
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Flow-sheet
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CEMTEC-turn-key plant
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- feeding material pre-crushed limestone (recommended maximum grain size 20 mm)- final product limestone slurry (normal fineness P90 = 44 μm)
- process water- purging water- compressed air/service air- compressed air/instrument air
General Data / Utilities
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Daily storage silo and material feed
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Daily storage silo and material feed
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Grinding mill including auxiliaries thereof
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Grinding mill including auxiliaries thereof
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Wet grinding mill section (lining not shown)
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Grinding mill inlet
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Grinding mill inlet detail Dilution water mill inlet
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Grinding mill discharge
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Grinding mill discharge detail
Dilution watermill discharge
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Circulation tank and slurry pumps
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Slurry circulation tank
withagitator
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Circulation tank and slurry pumps
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Hydrocyclones and density measurement
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Hydrocyclone clusters
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Slurry diverter valve
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Density measurement
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Limestone slurry (product) tank
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Valves and piping
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limestone slurry piping
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process water piping
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purging water piping
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Starting with cut of valvesat take over point(s)
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flow control valves for dilution water
process piping for limestone slurry
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including limit switches for end positionse.g. pneumatic actuated valves
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instrumentation
local control boxes and local indication
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Auxiliary media piping
instrument air for pneumatic actuators
purging water piping
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Control system
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No Automatic Sequences including Subsequences01 Grinding circuit production sequence02 Grinding circuit standby sequence03 Central lubrication sequence04 Gear rim lubrication sequence05 Main/standby pump changeover sequence06 Mill antisedimentation sequence07 Mill main drive sequence08 Slurry pump circuit purging sequence09 Mill purging sequence10 Hydrocyclones and mill purging sequence11 Hydrocyclones purging sequence12 Tank emptying sequence13 Knife gates purging sequence 14 Mill inlet purging sequence15 Mill discharge coarse overflow purging sequence
Operating modesThe operating modes managed by the PLC are the following :•Maintenance (with local selector on “LOCAL”);•manual (with local selectors on “REMOTE”);•Automatic (with local selectors on “REMOTE”);
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HMI - Plant overview
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HMI – Grinding circuit overview
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HMI – Grinding mill overview
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HMI – Pump and hydrocyclone overview
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HMI – Settings (password protected)
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Auxiliary Equipments
maintenance platforms and walkways
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sound deadening covers for ball mills
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grinding media filling/refilling devices
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grinding media sorting machine
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Thank you!