verticale

You cannot improve what you cannot control, and you cannot control what you cannot measure.

(in lingua inglese)

One can improve petrochemical plants production by increasing the safety and reliability of the processes through the use of radiometric devices. Lord Kelvin once said, “If you cannot measure it, you cannot improve it.” This is true in today’s oil & gas industry. These improvements can be implemented with the use of radiometric levels and densities. We will discuss how some process such as gas phase reactors and high-pressure LDPE can be improved.

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Atti di convegni o presentazioni contenenti case history
mcT Petrolchimico Milano novembre 2018 workshop

Pubblicato
da Alessio Rampini
mcT Petrolchimico Milano 2018Segui aziendaSegui




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Estratto del testo
Milano, 29 novembre 2018 Gli atti dei convegni e pi di 10.000 contenuti su www.verticale.net P r o c e s s C o n t r o l You cannot improve what you cannot control'' P r o c e s s C o n t r o l An Introduction to
Berthold Italia Srl
Brugherio Italy P r o c e s s C o n t r o l Engineering Sales Installation Start-up Service and repair center Technical support Who We Are Since from 38 years the staff of Berthold Italia S.r.l. is working in order to help the
engineering company and the final customer to solve the problem of contactless
measurement. An Introduction to Berthold Technologies GmbH & Co KG ) Our Business P r o c e s s C o n t r o l Organisation 5 engineers for engineering and sales 2 technician for external service (Italy
and worldwide) 1 external technician for external
service (Italy and worldwide) 3 Company employees Approx. 2 Million of Euro as Total
annual turnover for Sales, Service and
Repair. Product distrubuted Firefly Hawk Mutec Turnover P r o c e s s C o n t r o l Customer example P r o c e s s C o n t r o l 9 Employees (31.12.2016) Vendite Berthold Industry Sales Bio Berthold sales Service for Industry Service for Bio Non Berthold Sales P r o c e s s C o n t r o l If you cannot measure it, you cannot improve it.' Lord Kelvin 'Measurement is the first step that leads to control and eventually to improvement.
If you can't measure something, you can't understand it. If you can't understand it,
you can't control it. If you can't control it, you can't improve it
.' H. James Harrington 'You cannot control it without measuring it, and you cannot measure it without
understanding it'
Quotes P r o c e s s C o n t r o l Gas Phase Reactor Levels P r o c e s s C o n t r o l Typically performed with DP cells 3 pressure gauges Two to measure vertical column density This value used to 'density compensate the DP level' The high low to measure level Issues Product density changes with product grade Packing density changes with particle size The height of the fluidization changes with gas flow Gas Phase Reactor Disengaging zone level Gas Phase disengaging zone levels Current Situation P r o c e s s C o n t r o l Why is level critical If level is too high Great chance of polymer carryover Carryover coats the heat exchanger Takes about 3-6 weeks to clean polymer out of the heat exchanger If level is too low Reduced capacity Gas Phase Reactor Disengaging zone level Gas Phase disengaging zone levels Current Situation P r o c e s s C o n t r o l Radiometric Level 1 long single rod detector The change in radiation is average across the length of rod detector Also the same issue as DP cell Bed Density Level Segment the level system to 4 or 5 shorter level detectors Can detector a bed density profile Provide a level signal to control Ensure level is not too high Help prevent carryover Gas Phase Reactor Disengaging zone level Gas Phase disengaging zone levels Solution P r o c e s s C o n t r o l Gas Phase Reactor Disengaging zone level P r o c e s s C o n t r o l High Pressure Separators in LDPE/EVA plants LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Common HPS Level arrangement LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Typically performed with Capacitance Probe Issues Coating Level reading errors High maintenance LDPE/EVA High Pressure Separators Current Situation LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Why is level critical If level is too high Great chance of polymer carryover Carryover coats the heat exchanger Issues with product quality If level is too low 'Gas out' condition Reduce plant efficiency Gas Phase disengaging zone levels Current Situation LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Internal Sources Sources are mounted inside
the vessel in a source well Strip detector is mounted
outside the vessel Point detectors are used for
Switches High Switch can be used for
GPC LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l High Switch can be used for
GPC Change in radiation at the
detector is almost linear across
the length LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l External Sources Sources are mounted external Point detectors are mounted at
various elevations 'Bore Holes' or 'Radiation
Windows' are manufactured in
the vessel LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Detectors 1-4 are summed to
make overall level span Detector 5 used for High level
and GPC Each detector has its own
correction factor. 1 2 3 4 5 LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Change in radiation to the
detector is a factor of the
density and process path. 1 2 3 4 5 LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Change in radiation to the
detector is a factor of the
density and process path. Process path is different for
each detector. 1 2 3 4 5 LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Change in radiation to the
detector is a factor of the
density and process path. Process path is different for
each detector. If density changes from
185kg/m3 to 225kg/m3 Detector #5 sees a 32% change 1 2 3 4 5 LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Change in radiation to the
detector is a factor of the
density and process path. Process path is different for
each detector. If density changes from
185kg/m3 to 225kg/m3 Detector #5 sees a 32% change Detector #4 sees a 44% Detector #3 sees a 51% 1 2 3 4 5 LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Gas Properties Compensation A i /Bi /Ci = Constants developed by Berthold D i /Ei = Constants developed by Berthold ' p = Product density (user entered) ' L i = Calculated level ' I = number of detector 1-4 ' Det i = Detector value ' Det GPC = Detector value of the GPC LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Before GPC LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l After GPC LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l After GPC LDPE/EVA High Pressure Separator Levels P r o c e s s C o n t r o l Questions''' Gas Phase Reactor Disengaging zone level


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