Cegrit Automatic Flyash Sampler
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Cegrit Automatic Flyash Sampler
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Benefits of using the Cegrit
Thank you for your interest in the CEGRIT Automatic Flyash Sampler. With no moving parts, each CEGRIT sampler collects a sample from one point in the boiler duct. Operating on duct vacuum to drive its atmospheric-air ejector, the CEGRIT maintains near-isokinetic sampling to keep collecting unbiased sample as boiler load and duct vacuum vary.
The CEGRIT kit is supplied with basic sampling system, 110-volt heater jacket (if appropriate; see below), probe, inlet nozzle, and sample jars. This is everything you need to start sampling immediately. At least 1” WG draft [negative duct pressure] is normally needed (if duct pressure is positive an adapter is available for an additional $99 and requires a tiny amount of plant compressed air), and flue gas temperature at the sampling point can be up to 1000°F — either upstream or downstream of an air preheater. When you install your sampler, the ejector nozzle area is easily adjusted to establish isokinetic flow, using a water manometer (not supplied) or other differential pressure measuring device temporarily to indicate flow through the CEGRIT.
The CEGRIT sampler collects ash samples that are constantly available for visual inspection by operating personnel and for laboratory analysis. Your CEGRIT samplers can help you achieve the following benefits:
Optimize combustion for minimum NOx emissions
Save fuel by minimizing excess air while controlling carbon losses
Produce high-quality flyash for sale
Minimize labor involved in routinely sampling flyash
Avoid sample bias and time lag involved in hopper or ash-line sampling
Since the CEGRIT was invented in England in 1946, approximately 1,300 of these samplers have been purchased worldwide. In the U.S., recently about 100 CEGRIT samplers have been bought each year, most of them by coal-fired electric utilities.
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How to Order Your CEGRIT Samplers
The CEGRIT is available from Mission Instruments with basic set plus the standard probe length of length 2 meters (6’ 7”), one inlet nozzle, high-temperature cyclone, and three sample jars, for a low price that depends on whether the flue gas temperature is more than, or less than, 450°F. When the temperature is below 450°F a heater is included to prevent condensation in the sample cyclone.
Additional glass sample jars and jar lids are available. For utility boiler flue gas temperatures higher than 450°F, a heater is usually unnecessary and is not included. Non-standard probe lengths from 1’ 9” to 9’ 10” can be substituted for a small added charge per CEGRIT sampler.
Samplers are usually available for immediate delivery. Shipping weight is approximately 30 pounds per sampler. The prices quoted are firm for 60 days, and terms are net 30 days. Please make out your purchase order to:
Mission Instruments
26705 Loma Verde
Mission Viejo, California 92691-6055 USA
Please include the following information with your order:
1. Probe length desired (if other than the standard), measured from planned mounting flange to flyash sampling point. Note that there’s a $95 per sampler added charge for lengths other than the standard length of 2 meters (6’ 7”). Should you decide to reduce probe length, you can easily cut the probe (and re-drill four holes) on-site.
2. Approximate flue gas velocity or Pitot differential pressure and corresponding temperature at the sampling point, at maximum load. We use this information to select the correct inlet nozzle size (there are four sizes) for your application. You can then use the CEGRIT’s cyclone pressure taps and adjustable ejector nozzle to set the proper isokinetic sampling rate corresponding to Pitot differential pressure at your sampling point.
If the velocity isn’t available when you order, we can estimate it for you from the duct area, temperature, and gross megawatt rating. (Should the information you supply us turn out to be inaccurate, you can purchase the correct size nozzle for $99 if your original nozzle has already been used, or exchange it at no charge if it hasn’t been exposed to the flue gas.) If no information on velocity is supplied, we’ll send the most common nozzle size (1/2”).
For setup only, you’ll need a Pitot probe with manometer to use temporarily to adjust the CEGRIT ejector nozzle. These aren’t supplied with the CEGRIT since most customers already have them available in-house for temporary use.
Delivery can be expedited by faxing your order to Mission Instruments at 949-582-0889. If you have any questions, please don’t hesitate to contact me.
George Sotter
949-582-0889 USA missionist@aol.com
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