RSS REPRESENTATIVE SAMPLING SYSTEM REPRESENTATIVE SAMPLING (BULK MATERIAL)
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1 RSS REPRESENTATIVE SAMPLING SYSTEM REPRESENTATIVE SAMPLING (BULK MATERIAL) The sampling system operates in accordance with approved international standards. Final sample size is suitable for making laboratory analysis. A/S Oldenvej Kvistgaard Denmark Phone: m-w@m-w.dk Web:
2 INTRODUCTION GENERAL DESCRIPTION The basic purpose of sampling is to collect a manageable mass of material which is representative of the total mass of material from which it was collected. This manageable mass of material, called a sample, is subject to certain preparation procedures, which render it suitable for either physical testing, or laboratory analysis. The types of tests or analyses, which are performed, are dependent on what characteristics are required to be measured to categorise the material. Knowledge of the bulk material properties: Content of prime property Moisture content Content of contamination Hardness (Hard Grove Index) Size distribution And many other properties are essential when controlling the quality of the material. The method by which samples are collected, the frequency of collecting samples and the accuracy of the samples collected, that is, how closely they represent the true characteristics of the total mass, all depend on the nature of the material being sampled. A totally homogeneous material will require the collection of only a single sample in order to determine its characteristics accurately, whereas a lumpy heterogeneous material will require the collection of many small samples, or increments, which, when combined, will represent the total mass, or lot, with an acceptable degree of accuracy. These increments should be collected from all parts of the lot, with the number required to be collected being dependent on the variability of the material constituting the lot. Since it is required to collect increments from all parts of the lot, it is necessary that the total lot is accessible. In other words, it is of fundamental importance that all particles in the lot have the same probability of being included in the final sample. To achieve this requirement, it is desirable to sample the lot whilst it is in a dynamic state. The properties are identified by taking representative samples from each bulk material batch used or collected. The Representative Sampling provides the operator with the means for executing the extraction and preparation of representative samples of the material. The Representative Sampling System operates in accordance with approved international standards. The sample size is suitable for making laboratory analysis. The results of the laboratory tests performed on the basis of the representative samples prepared by the sampling system is used for: Calculating the value or payment for each batch of material Adjusting downstream production Calculating the amount of by-products from each batch Calculating the blending of various material batches A/S Oldenvej Kvistgaard Denmark Phone: m-w@m-w.dk Web:
3 EXAMPLE OF SAMPLING PLAN (COAL) EQUIPMENT SIZING CONSIDERATIONS In order to verify the coal properties for a given coal lot it is necessary to take out a number u of sampling units. This number depends on the mass of the lot and on the desired overall sampling precision. Minimum requirements are listed in Table 1. Each sampling unit is taken by the sampling equipment as n increments, where n should be 10 or more. The properties of the coal lot can be determined with an overall precision P L using equation 1 where: V PT is variance of sample preparation and test. If no data available: Assume 0.2 V I is the variance of primary increment. If no data available: Assume 20 The overall precision is a function of the number of sampling units u, the variance of sample preparation and test V PT, the number of increments n and the variance of the increments V I. If a given precision P L is required the number of increments n and the number of sampling units u can be found using Equation 2 and 3 respectively. The values n and u are adjusted upwards and recalculated to a convenient combination respecting the required minimum values. Equation 1: = ±2 The mass of each primary increment can be calculated using Equation 4 where: C is flow rate [t/h] on conveyor belt. A is cutting aperture [mm]. Should be 3 times the nominal top size of coal. S is cutter speed [m/s]. If S is constant the incremental mass is a function of the flow rate C, the nominal top size of the coal lumps and cutting aperture A. As a guideline for lay-out of sampling systems the reference increment mass from Table 2 should be used as minimum values. The total mass of the sample (sampling unit) is at least n times the increment mass where n is at least 10 as previously discussed. Sample division To obtain convenient sample masses, the sample is divided into a number of statistically identical but smaller samples and a rest which is returned to the coal conveyor. From the preceding section is seen, that reducing the mass needs a reduction in particle size in order to preserve the representative nature of the sample. For this reason a system for extraction of representative samples of coal consists of multistage extraction, particle reduction and division equipment. Equation 2: = Equation 4: =, 10 [#$] Equation 3: = Mass of Lot tonnes No. of sampling units < Nominal top size of coal [mm] Reference incr. mass [kg] ,5 1 22,4 0, ,50 11,2 0,25 8 0,15 A/S Oldenvej Kvistgaard Denmark Phone: m-w@m-w.dk Web:
4 TYPICAL PROCESS DIAGRAM DEFINITIONS Lot: A quantity of material for which the overall quality to a particular precision needs to be determined. Sub-lot: Equally sized parts of a lot, which properties are to be determined. Norminal top size: The smallest sieve on which not more than 5% of the sample is retained. Primary Increment: The amount of material which the primary sampling tool takes out of the material stream in one cut. Cut: An increment taken by a sampler. Gross Sample: A material sample consisting of all the primary Increments taken from a sub-lot. Division: A sample preparation process, in which the sample is divided in a number of smaller portions. Sample: The quantity of material consisting of all the increments taken from a lot/sub-lot. 1. Main conveyor belt 2. Cross Belt Bucket Sampler (CBBS) 3. Dosing Conveyor (DC) 4. Twin Roll Crusher (VK) 5. Rotary Tube Divider (PD) 6. Bias Valve 7. Buffer Container 8. Dosing Conveyor (DC) 9. Rotary Tube Divider (PD) 10. Sample Containers 11. Reject Conveyor (RC) Final sample: A sample prepared from the sample of a sub-lot. Precision: Expressed in % and within 95% confidence level. Bias: A systematic error that creates results that on regular basis are higher or lower than the true value. A/S Oldenvej Kvistgaard Denmark Phone: m-w@m-w.dk Web:
5 QUESTIONNAIRE FOR SAMPLING AND SAMPLE PREPARATION Plant name, owner and address , ID and phone no. Media (material type) Reference standard Location of sample extraction (free fall at belt end or on the belt) Place for disposal of reject material Weight of total LOT Period of time for LOT Bulk density of material kg/m³ Max. grain size Nominal top size mm Conveyor belt width mm speed m/sec capacity t/h height above ground m t h After sample preparation: Final max. grain size Final sample weight mm kg EXAMPLE OF COMPLETED QUESTIONNAIRE Media (material type) Coal Reference standard ISO Location of sample extraction (free fall at belt end or on the belt) Place for disposal of reject material On the horizontal belt Back on the main horizontal belt Weight of total LOT t Period of time for LOT 8 h Bulk density of material 2200 kg/m³ Max. grain size 50 Nominal top size 30 mm Conveyor belt width 1200 mm speed 1,6 m/sec capacity 2500 t/h height above ground 5 m After sample preparation: Final max. grain size 10 mm Final sample weight 10 kg A/S Oldenvej Kvistgaard Denmark Phone: m-w@m-w.dk Web:
6 Cross Belt Hammer Sampler Rotary Tube Divider (motorised ed flap) Twin Roll Crusher Sampl Collector Sample is an internationally working engineering company specialised in design, manufacturing and supply of individual machine units and systems for representative sampling of powder and bulk material. Several hundred systems are successfully sampling in the industry world-wide. world A/S Oldenvej Kvistgaard Denmark Phone: E mail: m-w@m-w.dk m Web:
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