Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N15/06—Investigating concentration of particle suspensions
  • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
  • G01N1/40—Concentrating samples
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
  • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
  • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
  • G01N2001/222—Other features
  • G01N2001/2223—Other features aerosol sampling devices
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N2015/0042—Investigating dispersion of solids
  • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N2015/0096—Investigating consistence of powders, dustability, dustiness

Definitions

• the invention relates to a device and a method for producing samples from predominantly dusty and dry material, especially dusty combustion residues such as filter or fly ash for the determination of the residual carbon content by determining the change in electrical parameters of a complex electrical component that the samples to be examined are produced made of mostly dusty and dry material.
• the invention is particularly intended for use in ash collectors of combustion plants in coal-fired plants. It is therefore mainly spoken of fly ash in the following, without the field of application of the invention being restricted to this.
• the invention can in fact also advantageously addition everywhere sets are ⁇ where the residual carbon content of mostly dusty and dry material by determining der ⁇ mecanic electrical parameters of complex electrical components to be determined which involve to be examined material. In addition to power plant combustion plants, these can also be waste incineration plants or plants for cement production.
• the determination of the residual carbon content of fly ash is necessary on the one hand from the point of view of the management and optimization of the combustion process, that is, for the most complete use of the energy contained in the fuel. on the other hand also for the quality control of the fly ash, for its use as an additive for the building materials and cement industry.
• the aim is, from both points of view, the lowest possible residual carbon content or the smallest possible proportion of unburned components.
• DE-OS 3303177 describes a method and a device for measuring the carbon content of fly ash, in which the change in the capacitance of a capacitor into which a fly ash sample is introduced as a dielectric is evaluated.
• a screw conveyor By means of a screw conveyor while fly ash is removed from a silo in a dielectric of a capacitor forming the measuring chamber via ⁇ leads and compacted by vibration.
• the capacity of the compressed fly ash sample-containing measuring chamber is determined after the determination of the Capa ⁇ zticianwird the fly ash sample from the measuring chamber removed and recycled by means of another conveyor screw into the silo.
• the carbon content of the fly ash is inferred from the electrically measured capacity.
• the method can be carried out continuously or periodically, it being necessary to ensure that the amount of fly ash contained in the measuring chamber is essentially constant on average and has a defined density in order to achieve usable measured values.
• a solution that is comparable in principle is described in DE-OS 19856870.
• ash that is transported in a pneumatic conveying system is fed to a sampler, whereby a defined particle content of the sample is realized by means of exhaust air filters and light barriers, the sample is heated to a predetermined analysis temperature and compressed by means of a vibrating device and then fed to a microwave analyzer.
• the residual carbon content in the processed sample fed to the microwave analyzer is determined in a known manner by means of microwave resonance technology.
• the examined sample is fed back into the pneumatic conveyor system.
• Object of the invention are a device and a method for producing Klia ⁇ schep robes for the determination of the residual carbon content by measuring the change in the electrical parameters of a complex electrical component, which contains the samples to be examined, which do not require a lot of equipment and which enable a high degree of accuracy in determining the residual carbon content.
• a device as described in claim I which consists of a screw conveyor and a complex electrical component designed as a closed measuring chamber, which are arranged such that the screw conveyor conveys and compresses the fly ash into the complex electrical component designed as a closed measuring chamber ,
• the method mainly powdery and dry material is compacted force (eg. As fly ash) to a sudden increase in the compression ⁇ .
• the method according to the invention is based on the finding that, when compaction of fly ash has reached a certain reproducible degree of compaction, there is a sudden increase in the compaction force by more than 200 percent, without a further increase in the degree of compaction being achieved. This makes it possible, by evaluating this considerable and significant jump in the compression force, to create reproducible compression ratios in a simple manner, which then lead to measurement results of high accuracy and low scatter using the measurement method described.
• the complex electrical component which is designed as a closed measuring chamber, is arranged together with a screw conveyor in a container holding the fly ash in such a way that the screw conveyor conveys the fly ash into the measuring chamber and compresses it until the torque used to convey and compress it jumps .
• the fly ash arrives directly into the measuring chamber and can be returned to the ash collecting container after measurement by reversing the direction of rotation of the screw conveyor of the screw conveyor. It can also be advantageous if the screw conveyor has a collecting trough which is open at the top and by means of which fly ash newly filled into the container can be collected. Such a collecting trough should be provided in particular if the screw conveyor is arranged within the container in such a way that it is not constantly in a fly ash bed. Of course, in the solution according to the invention it is also possible and sensible to provide a device on the complex electrical component designed as a measuring chamber, which enables a fly ash sample to be taken for external, calibrating examinations.
• a particular advantage of the solution according to the invention is seen in its simplicity in addition to the achievable accurate and less scattering measurement results.
• Both the device consisting of the screw conveyor and the complex electrical component designed as a measuring chamber and the method according to the invention are easily controllable technical solutions which can be used in a large number of measuring tasks for determining the residual carbon content of fly ash by determining the change in electrical quantities of a complex electrical receiving the samples Component can be used with advantage.
• the inventive device and the inventive method will be explained nachfol ⁇ neighborhood reference to an embodiment in more detail.
• the accompanying drawing shows a partial section of a disposed in the side wall of a Aschesammelbereheatl I ⁇ ters device according to the invention.
• This consists of a screw conveyor 2 and is designed as a closed measuring chamber Komple ⁇ xen electrical component 3.
• the screw 4 of the screw conveyor 2 runs within a tube 5 that end face and at the top of openings 6 for the inlet and outlet of the fly ash has.
• the screw conveyor has a length of approx. 300 millimeters and a diameter of approx. 40 millimeters.
• the upper openings 6 are ⁇ and a circle arc of about 40 degrees opening recesses in the tube 5 is made as about 60 millimeters long.
• the conveyor screw 4 is driven by an electric motor 7 arranged outside the container.
• the complex electrical component 3 is arranged above the screw conveyor 2 such that fly ash captured by the screw conveyor 4 can be conveyed into the complex electrical component 3.
• the screw conveyor 2 is located inside a fly ash bed. The fly ash reaches the screw conveyor 2 through the upper openings 6, possibly also the end opening 6, and is conveyed and increasingly compressed by the rotation of the screw conveyor 4 into the closed measuring chamber of the complex electrical component 3.
• the complex electrical component 3 Increases the captured by the screw conveyor 2 torque abruptly from ca.0,1 Newton meters on ca.0,3 Newton meters, the complex electrical component 3 is reached, a defined compression of the fly ash within the closed measuring chamber, the mung a sufficiently accurate Bestim ⁇ the residual carbon content of the Fly ash by determining the change in electrical quantities of the complex electrical component 3 in which the compressed fly ash is located.
• the scatter of the measured values achieved in the exemplary embodiment described is below ⁇ 0.2 percent.
• the complex electrical component 3 is emptied by reversing the direction of rotation of the screw conveyor 4 and the fly ash is conveyed back into the container.

Landscapes

• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Molecular Biology (AREA)
• Dispersion Chemistry (AREA)
• Processing Of Solid Wastes (AREA)
• Sampling And Sample Adjustment (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Screw Conveyors (AREA)
• Manufacturing Of Cigar And Cigarette Tobacco (AREA)
• Glass Compositions (AREA)
• Oscillators With Electromechanical Resonators (AREA)

Priority Applications (12)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7672887

Family Applications (1)

Country Status (18)

Families Citing this family (10)

Family Cites Families (14)

• 2001
  • 2001-02-05 DE DE10105117A patent/DE10105117C2/de not_active Expired - Fee Related
• 2002
  • 2002-01-30 AT AT02708197T patent/ATE272210T1/de active
  • 2002-01-30 KR KR1020037010343A patent/KR100601412B1/ko not_active Expired - Fee Related
  • 2002-01-30 EP EP02708197A patent/EP1358464B1/de not_active Expired - Lifetime
  • 2002-01-30 CA CA002436431A patent/CA2436431C/en not_active Expired - Fee Related
  • 2002-01-30 WO PCT/DE2002/000381 patent/WO2002063276A2/de not_active Ceased
  • 2002-01-30 CN CNB028044738A patent/CN1225645C/zh not_active Expired - Fee Related
  • 2002-01-30 BR BRPI0206973-3A patent/BR0206973B1/pt not_active IP Right Cessation
  • 2002-01-30 UA UA2003087340A patent/UA74619C2/uk unknown
  • 2002-01-30 DK DK02708197T patent/DK1358464T3/da active
  • 2002-01-30 MX MXPA03006979A patent/MXPA03006979A/es active IP Right Grant
  • 2002-01-30 RU RU2003127405/12A patent/RU2307333C2/ru not_active IP Right Cessation
  • 2002-01-30 JP JP2002562972A patent/JP4109115B2/ja not_active Expired - Lifetime
  • 2002-01-30 AU AU2002242620A patent/AU2002242620B2/en not_active Ceased
  • 2002-01-30 DE DE50200699T patent/DE50200699D1/de not_active Expired - Lifetime
  • 2002-01-30 ES ES02708197T patent/ES2225763T3/es not_active Expired - Lifetime
  • 2002-01-30 CZ CZ20032115A patent/CZ294554B6/cs not_active IP Right Cessation
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