Thiết bị lấy mẫu tro khô (Iso Kinetic Flyash Sampling Kit)
Mã sản phẩm: ICT-ISF-00
Hãng sản xuất: ICT
Thông số kỹ thuật
Figure 1 - Isokinetic Sampling opposed to Non-Isokinetic Sampling
Flyash Loss on Ignition (L.O.I.) or unburned Carbon level is indicative of combustion efficiency. For this reason, an “in-situ” flyash sample is frequently extracted for diagnostic or quantitative reasons. Two types of duct inserted flyash samplers are utilized to collect flyash samples; these are High Volume Samplers and Isokinetic Samplers. The High Volume Sampler is expedient and simple, and is usually used for diagnostic purposes or periodic monitoring of flyash L.O.I. The High Volume Sampler collects a larger bulk sample than the Isokinetic Sampler, allowing shorter collection time. Additionally, its simplicity requires little training or expertise of persons performing the test. In some cases, a more accurate sample must be collected for contractual specification, compliance with flyash sale restrictions or dust loading. In these cases, an Isokinetic Sampler must be utilized. For collection of an Isokinetic flyash sample, we have found the ICT “Isokinetic Flyash” probe to be a reliable, efficient means of accomplishing this goal. The Isokinetic Flyash probe uses a three-hole “Fecheimer” head to measure velocity head and an “in-line” calibrated square-edged orifice to maintain the required sampling velocities. The Isokinetic Dust (Flyash) Sampler is illustrated by Figure 2 on the following page. A High Volume Flyash Sampler is also illustrated by Figure 3 on the following page.
Figure 2 - The ICT Isokinetic Flyash Type Dust Sampler
Figure 3 - Flue inserted High Volume Flyash Sampler
Test Tap Location and Lay-out According to the ASME Test Code PTC 38 “Determining the Concentration of Particulate Matter in a Gas Stream”, test tap layout should ideally be such that sampling access ports and traverse points are selected to permit sampling in zones of equal areas. The traverse grid should facilitate at least one traverse point for every 9ft². For example: a 12’ × 36’ duct with a cross-sectional area of 432ft² will require a minimum of (48) traverse points. The traverse grid should be located in a straight run of ductwork (constant cross-sectional area), preferably a vertical run, in order to minimize stratification of the medium. In addition, the traverse grid should be located a minimum of eight (8) duct diameters downstream and two (2) duct diameters upstream from the nearest flow disturbance. Since these criteria are often impossible to meet, test taps are generally located in the “best possible” location. This is acceptable if all parties involved in the testing agree. Adequacy of probe access, lighting, power facilities, etc. should also be considered when choosing a location.
Figure 4 - Example of Equal Area Sampling Grid
Flyash samples are typically collected at the air pre-heater’s gas inlet or gas outlet ducting. The air heater gas outlet is usually the preferred sampling location due to lower gas temperatures making probe handling easier. Stratification in ash is also less prominent at the air heater gas outlet due to the homogenization effect of the air heater’s basket type heating surface. The Isokinetic Flyash flyash sampler’s head is 3” in diameter and will require test ports of 4” pipe or larger. Figure 5 illustrates typical locations for collecting a flyash sample.
Figure 5 - Typical locations for collection of a flyash sample
Thiết bị lấy mẫu tro khô (Iso Kinetic Flyash Sampling Kit)
Mã sản phẩm: ICT-ISF-00
Hãng sản xuất: ICT
Thông số kỹ thuật
Figure 1 - Isokinetic Sampling opposed to Non-Isokinetic Sampling
Flyash Loss on Ignition (L.O.I.) or unburned Carbon level is indicative of combustion efficiency. For this reason, an “in-situ” flyash sample is frequently extracted for diagnostic or quantitative reasons. Two types of duct inserted flyash samplers are utilized to collect flyash samples; these are High Volume Samplers and Isokinetic Samplers. The High Volume Sampler is expedient and simple, and is usually used for diagnostic purposes or periodic monitoring of flyash L.O.I. The High Volume Sampler collects a larger bulk sample than the Isokinetic Sampler, allowing shorter collection time. Additionally, its simplicity requires little training or expertise of persons performing the test. In some cases, a more accurate sample must be collected for contractual specification, compliance with flyash sale restrictions or dust loading. In these cases, an Isokinetic Sampler must be utilized. For collection of an Isokinetic flyash sample, we have found the ICT “Isokinetic Flyash” probe to be a reliable, efficient means of accomplishing this goal. The Isokinetic Flyash probe uses a three-hole “Fecheimer” head to measure velocity head and an “in-line” calibrated square-edged orifice to maintain the required sampling velocities. The Isokinetic Dust (Flyash) Sampler is illustrated by Figure 2 on the following page. A High Volume Flyash Sampler is also illustrated by Figure 3 on the following page.
Figure 2 - The ICT Isokinetic Flyash Type Dust Sampler
Figure 3 - Flue inserted High Volume Flyash Sampler
Test Tap Location and Lay-out According to the ASME Test Code PTC 38 “Determining the Concentration of Particulate Matter in a Gas Stream”, test tap layout should ideally be such that sampling access ports and traverse points are selected to permit sampling in zones of equal areas. The traverse grid should facilitate at least one traverse point for every 9ft². For example: a 12’ × 36’ duct with a cross-sectional area of 432ft² will require a minimum of (48) traverse points. The traverse grid should be located in a straight run of ductwork (constant cross-sectional area), preferably a vertical run, in order to minimize stratification of the medium. In addition, the traverse grid should be located a minimum of eight (8) duct diameters downstream and two (2) duct diameters upstream from the nearest flow disturbance. Since these criteria are often impossible to meet, test taps are generally located in the “best possible” location. This is acceptable if all parties involved in the testing agree. Adequacy of probe access, lighting, power facilities, etc. should also be considered when choosing a location.
Figure 4 - Example of Equal Area Sampling Grid
Flyash samples are typically collected at the air pre-heater’s gas inlet or gas outlet ducting. The air heater gas outlet is usually the preferred sampling location due to lower gas temperatures making probe handling easier. Stratification in ash is also less prominent at the air heater gas outlet due to the homogenization effect of the air heater’s basket type heating surface. The Isokinetic Flyash flyash sampler’s head is 3” in diameter and will require test ports of 4” pipe or larger. Figure 5 illustrates typical locations for collecting a flyash sample.
Figure 5 - Typical locations for collection of a flyash sample
