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Monitoring of particulate emissions in food processing
SSIONSMONITORIN
Monitoring of particulate emissions in food processing BR Foods Ltd - a major manufacturer of starch and gluten based in Corby, UK - wished to monitor particulate emissions from its gluten dryer, to provide an instant indication of filter problems. This was to back up existing detection procedures, and to enable an operator to take action to avoid environmental emissions. It was implemented as a result of ABR’s strong company environmental policy. The installation of PCME’s DT-200 in the emission duct has proven a satisfactory solution. In the gluten manufacturing process, the gluten is passed into a large dryer. The dried gluten is filtered from the air by a large reverse jet type filter unit. ABR wished to monitor the particulate emissions from this arrestment plant, to avoid the possibility of environmental emissions resulting from a filter rupture remaining undetected. It was hoped that an appropriate monitor would also facilitate the anticipation of finer failure by indicating deteriorating emission levels. The Process Engineering & Environmental Department was naturally concerned that the dust monitor would work reliably in the harsh environment of the dust collector exhaust, because
A
The installation of the PCME DT-200 dust monitor at ABR Foods, on one of its starch dryers.
Filtration -5 Separation
_,@.eeb
.
..I.............
Emission
i
.
.
16 Lk 1 DeC%?.ee~41~53
2 OK %
levels
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.
.
.
.
.
.
.
.
.
.
.
.
.
.
..i
.
.
.
.
.
.
.
.
38 Dee
fnnn DT-200 installed on starch
of the vibration, temperatures in excess of 100°C and the sticlty nature of the particulate. Menardi Criswell - a specialist in dust collector services, and part of the Hosokawa Micron Group recommended that ABR contacted PCME. In May 1992 ABR installed PCME’s DT-200 monitor in the dust collector outlet, and a DT-300 data-logger in the plant control room. The DT-200 is a particle impingement (triboelectric) dust monitor, working on the principle of monitoring the small but repeatable electrical signal produced when particles collide against a sensing rod which protrudes into the dust collector exhaust. The IX-200 sensor was installed by a single 1 inch BSP coupling, which facilitated installation in the diverging ductwork following the dust collector. The 4 - 20 mA output from the DT200, proportional to the dust concentration, was recorded by the DT-300 located 50 m away in the control room. Alarms are set to activate when emissions exceed preset limits. The data are downloaded monthly (or as required) from the IX-300 to a PC, where Pronto software is used to graphically display and analyse the recorded emissions. ABR has found the D-Tech system to have proved itself to be a reliable and
September/October 1993
.
i
.
.
13 Jm
.
.
.
.
.
.
.
.
;..............,..,__.:
.
37 Jn
.
.
.
.
.
.
.
.
.
.
10 feb
.
.
.
.
.
.
.
.
.
.
,....,,
24 F.b tm tw
dryer at ABR Foods, over a three-month period.
effective system for monitoring of emissions. The D-Tech probe has not required cleaning since installation. The system has tracked emissions, and it is therefore possible that it will track the slow deterioration of a fllter, enabling remedial maintenance in time. Dave Goodman, ABR’s environmental manager, was pleased at the successful D-Tech system evaluation, since he was well aware of the difflculty in finding an alternative monitor for this application. Optical monitors could require substantial maintenance, and less sophisticated triboelectric devices had not worked in similar applications at the same site. The DT200 has been a satisfactory solution. ABR has used the D-Tech system as an indicative monitor for the first 12 months of use. The unit will be calibrated in mg/m3 when an isokinetic sampling of emissions is performed.
q
PolLu&icmCont?vl & Measu-t
Cfiww)
ud
Stonehill Sh&eley Meadows Indust& Estate Huntingdon, Can&s. PE18 6EL, UK Tel: + 44 (0) 480 455611 Fax: + 44 CO)480 413500 523
Monitoring of particulate emissions in food processing BR Foods Ltd - a major manufacturer of starch and gluten based in Corby, UK - wished to monitor particulate emissions from its gluten dryer, to provide an instant indication of filter problems. This was to back up existing detection procedures, and to enable an operator to take action to avoid environmental emissions. It was implemented as a result of ABR’s strong company environmental policy. The installation of PCME’s DT-200 in the emission duct has proven a satisfactory solution. In the gluten manufacturing process, the gluten is passed into a large dryer. The dried gluten is filtered from the air by a large reverse jet type filter unit. ABR wished to monitor the particulate emissions from this arrestment plant, to avoid the possibility of environmental emissions resulting from a filter rupture remaining undetected. It was hoped that an appropriate monitor would also facilitate the anticipation of finer failure by indicating deteriorating emission levels. The Process Engineering & Environmental Department was naturally concerned that the dust monitor would work reliably in the harsh environment of the dust collector exhaust, because
A
The installation of the PCME DT-200 dust monitor at ABR Foods, on one of its starch dryers.
Filtration -5 Separation
_,@.eeb
.
..I.............
Emission
i
.
.
16 Lk 1 DeC%?.ee~41~53
2 OK %
levels
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
..i
.
.
.
.
.
.
.
.
38 Dee
fnnn DT-200 installed on starch
of the vibration, temperatures in excess of 100°C and the sticlty nature of the particulate. Menardi Criswell - a specialist in dust collector services, and part of the Hosokawa Micron Group recommended that ABR contacted PCME. In May 1992 ABR installed PCME’s DT-200 monitor in the dust collector outlet, and a DT-300 data-logger in the plant control room. The DT-200 is a particle impingement (triboelectric) dust monitor, working on the principle of monitoring the small but repeatable electrical signal produced when particles collide against a sensing rod which protrudes into the dust collector exhaust. The IX-200 sensor was installed by a single 1 inch BSP coupling, which facilitated installation in the diverging ductwork following the dust collector. The 4 - 20 mA output from the DT200, proportional to the dust concentration, was recorded by the DT-300 located 50 m away in the control room. Alarms are set to activate when emissions exceed preset limits. The data are downloaded monthly (or as required) from the IX-300 to a PC, where Pronto software is used to graphically display and analyse the recorded emissions. ABR has found the D-Tech system to have proved itself to be a reliable and
September/October 1993
.
i
.
.
13 Jm
.
.
.
.
.
.
.
.
;..............,..,__.:
.
37 Jn
.
.
.
.
.
.
.
.
.
.
10 feb
.
.
.
.
.
.
.
.
.
.
,....,,
24 F.b tm tw
dryer at ABR Foods, over a three-month period.
effective system for monitoring of emissions. The D-Tech probe has not required cleaning since installation. The system has tracked emissions, and it is therefore possible that it will track the slow deterioration of a fllter, enabling remedial maintenance in time. Dave Goodman, ABR’s environmental manager, was pleased at the successful D-Tech system evaluation, since he was well aware of the difflculty in finding an alternative monitor for this application. Optical monitors could require substantial maintenance, and less sophisticated triboelectric devices had not worked in similar applications at the same site. The DT200 has been a satisfactory solution. ABR has used the D-Tech system as an indicative monitor for the first 12 months of use. The unit will be calibrated in mg/m3 when an isokinetic sampling of emissions is performed.
q
PolLu&icmCont?vl & Measu-t
Cfiww)
ud
Stonehill Sh&eley Meadows Indust& Estate Huntingdon, Can&s. PE18 6EL, UK Tel: + 44 (0) 480 455611 Fax: + 44 CO)480 413500 523