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  INTRODUCTION    Since 1978, The Electron Machine Corporation has installed complete Monitor Divert Systems protecting recovery boilers and personnel worldwide. The system is designed to monitor black liquor solids to the recovery furnace and automatically divert the liquor should the solids concentration fall below 58% or other pre-selected point. This system greatly reduces the chance of smelt water explosions caused by the introduction of low solids liquor into the furnace through gun nozzles.   This latest system, model MDS E-Scan, is a third generation unit employing microprocessor circuitry to do a comprehensive check of all the operating functions of two independent refractometers. The system meets or exceeds the recommendations of the Black Liquor Recovery Boiler Advisory Committee (BLRBAC).   The Electron Machine Corporation has placed more than 30 years of refractometer experience into the development of the MDS E-Scan Black Liquor Divert System. Using the newest CCD electronic scanning technology, hence E-Scan, coupled to an easy menu-driven 386 processing unit, it provides an accurate and reliable liquor solids measurement.  

DESCRIPTION

The MDS E-Scan consists of two MPR E-Scan microprocessor-based refractometers each operating independently. A third processor supervises the proper operation of each refractometer to insure it stays within operational limits. It also contains alarm and divert logic to initiate the proper action should a fault or low solids liquor be detected. A built-in printer records all actions with a date and time stamp. All units have a large transmissive LCD display with backlight for easy viewing and menu selection.

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OPERATION

All functions of the MDS E-Scan are automatic. For example, should a refractometer fault occur the unit is electronically removed from service and an alarm is activated. Simultaneously the output signal is driven low to warn the operator to disregard this reading. The monitor system then isolates, displays the fault and provides a hard copy record on the standard built-in printer. Liquor diversion is now controlled by the refractometer still in service.

Many features are incorporated into the MDS E-Scan. Besides providing a printout of all critical operations, the monitor unit will data log error alarms, warning alarms, diverts, prism purge duration, comparator readings, etc. This valuable information can be useful in both preventive and predictive maintenance.   Other special features include:

The MDS E-Scan monitor double checks all important areas with microprocessor speed. Even the analog and digital output signals are compared for accuracy.

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 OUTPUTS    Standard output is a 4-20 ma for liquor concentration. Relay contacts are used for liquor divert, alarms, and system error indicators. A built-in printer is a standard feature for the MDS E-Scan. A remote divert input line is also available. Consult the factory for hardware/software options to suit your special requirements.  

OPTIONS

Systems are complete and options are minimal.

OPTION (A)

A 316 stainless steel NEMA 4X console to house the complete divert system with display windows and system switches. This comes with a vortex cooler for hostile environments.

OPTION (B)

The RSP is a remote status panel containing an LCD display with backlight which shows the current percent solids, liquor temperature, and a 2-hour continuous solids graph for each unit. A dotted line on the RSP indicates the divert point as a reminder when the solids are low.
 

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