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MOISTURE METERS FOR COAL (ANTHRACITE), IRON-ORE CONCENTRATE, SALT AND OTHER HIGH-CONDUCTIVITY MATERIALS

December 7, 2017

We have manufactured the first batch of FIZEPR-SW100.10.16 moisture meters designed to measure moisture content in coal (anthracite), iron ore concentrate and NaCl salt.

These meters can also be used to control other high-conductivity bulk materials e.g. as potash, soda, aluminum hydroxide, ore, potassium salts, etc. FIZEPR-SW100.10.16 is also applicable when measuring moisture content in iron-ore concentrate and other magnetic materials.

The FIZEPR-SW100.10.16 coal moisture sensor is similar to the widely used FIZEPR-SW100.10.6 bulk material sensor in its design and installation in hoppers and on belt conveyors.

FIZEPR-SW100.10.16 moisture meter (explosion-proof version)

As opposite to the FIZEPR-SW100.10.6 version used on conductive materials with a probe-covering dielectric case (tube) only, the new moisture meter ensures measurements at virtually any conductivity of a material measured, and without any dielectric layer between the probe and the material. The solution designed improves significantly sensor reliability when operated on abrasive and lump materials.

FIZEPR-SW100.10.16

 

 

The FIZEPR-SW100.10.16 sensor is made entirely of AISI 321 abrasion-resistant steel. On request, the sensor can be made of AISI 420 spring stainless steel hardened to 58… 60 HRC featuring exceptional strength and abrasion resistance.

In its other parameters the FIZEPR-SW100.10.16 coal moisture meter is equivalent to the well-known FIZEPR-SW100.10.6 version and similarly uses the dielectric measurement method.

The measured volume of a material to be controlled is 10…20 liters. Such a high volume of a simultaneously measured material eliminates any effect of inhomogeneous moisture distribution in the material and loose material-to-sensor contact while enabling measurements of materials with a size grade up to 30…40 mm.

 

FIZEPR-SW100.10.16 moisture meter and control cabinet

 

The moisture meter is available in explosion-proof version to control moisture content in coal and other explosive materials.

The new moisture meter is available in the 10.162 version (see figure enclosed) for measurements at temperatures up to 200ºС.

FIZEPR-SW100.10.162 sensor for high temperatures

 

 

 

 

 

The FIZEPR-SW100.10.16 moisture meter was originally designed to measure moisture content in sodium chloride (NaCl) in a hopper or conveyor belt flow. The moisture measurement range is 0 to 100%.

 The FIZEPR-SW100.10.16 moisture meter was designed in parallel with FIZEPR-SW100.27.х moisture meters similar to it in their operating principle intended to control the composition of sodium chloride slurry and other high-conductivity liquid materials in pipelines.

FIZEPR-SW100.27.x sensor

 

FIZEPR-SW100.27.х sensors are the result of FIZEPR-SW100.20.х series development and similarly made as a pipe with flanges. Working pressures (PN) are up to 160 bar, nominal bores (DN) are 50 to 100 mm. FIZEPR-SW100.27.х moisture meters are applicable in slurry control at cement production, measurements of coal-water slurry (CWS) fuel composition and salt slurry composition control (solid-to-liquid ratio measurement in a slurry flow).

 

 

Concentrate, W=10%FIZEPR-SW100.10.16 moisture meters were tested on iron-ore concentrate at Karelsky Concentrate, W=13%Okatysh and Evraztekhnika plants. The instrument ensures iron-ore concentrate moisture measurement in the range from 0 to 15%, i.e. from the dry material to the liquid slurry where concentrate is under the water layer as shown in the photo enclosed.

Concentrate, W=15,7%

Measuring Dryness Fraction of Steam. Control of Catalyst Activity in Reactors

May 1, 2016

The FIZEPR-SW100 dielectric moisture meter is modified for process media control at extreme temperatures. 

Purpose:

  • measuring of steam-water mixture composition (steam dryness fraction and moisture) in turbines and boilers at temperatures up to 374 ºC and pressures up to 220 bar and over;
  • control of media phase state and composition in high-temperature chemical reactors;
  • measuring parameters of powder and granular catalysts, control of their activity, coke formation monitoring;
  • measuring the cryogenic liquid level in Dewar vessels.

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An engineering solution implemented in the new design enables measurements of media featuring extreme temperatures and pressures without any changes in accuracy. Refer to Patent No.  RU2576552 for description of the new analyzer design and measurement method:

http://fizepr.ru/sites/default/files/patent_2_576_552_n7.pdf

Summary of the invention: the microwave signal receiver and transmitter are made as individual units connected by a uniform transmission line, e.g. by a cable. A primary transducer – probe – is connected to the middle section of the cable. It bypasses signal transmission by the cable when the transducer resonates.

This enables resonance frequency monitoring at a distance from the measurement area with extreme conditions. The working range of sensor temperatures is now determined by allowable ceramics and probe metal temperatures only. The introduced update has virtually no any impact on the permittivity measurement accuracy εr. The accuracy of measurement is up to 4 significant digits.

This solution makes it possible to not only measure material compositions remotely, but also monitor liquid media levels at a distance, e.g. coolant level at nuclear power plants or liquid level in vessels under pressures of several hundred atmospheres. The patent on the moisture meter for extreme conditions is available at:

http://fizepr.ru/sites/default/files/patent_2_597_809_n10.pdf

The photos show a steam dryness fraction meter made based on the referenced patents. The steam dryness fraction meter is used in the steam-generating plant operated at the high-viscosity oil field. Working pressure is 22bar, working temperature is about 220ºС, and dryness fraction of steam is about  90%.

 Steam-water mixture in the pipe was quite stable as seen from the given spectrum. The record was made during 10 minutes and spectra recorded at 1-minute intervals were nearly coincident.

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Refer to an example below displaying the FIZEPR-SW100 analyzer application in catalyst activity control with the results of measuring four samples of KDM-M chromia-alumina powder catalyst used in synthetic rubber production. The samples were taken from the existing unit for dehydrogenation of isobutane to isobutylene. Only reference numbers of the samples were marked on the sample labels before testing.

Measuring involves scanning a spectrum – frequency response of the sensor placed inside the material to be analyzed. The curves below show the measured spectra of Samples No. 1-4:

The FIZEPR-SW100 analyzer uses the spectra to identify dielectric parameters. The table below shows the results of measuring the catalyst dielectric parameters:

It appears that as the coke contaminates the catalyst, both its permittivity and dielectric loss tangent increase respectively.

Permittivity is increased by a factor of two (i.e. by 100 %); it is a dramatic change considering that the analyzer sensitivity is not worse than 0.06 % of the controlled parameter value.

Dielectric loss tangent of the samples changes by more than a factor of 50.

It should be noted that all types of catalysts based on aluminum and silicon oxides will produce the same results. The possibility to control the coke content is determined by the fact that the permittivity of coal and coke particles is significantly higher than the same of aluminum oxides and far higher than of silicon oxides, while the coal conductivity is greater than the conductivity of the materials specified by a number of times.

The FIZEPR-SW100 analyzer converts the dielectric parameters into the carbon ratio (or other value, e.g. the catalyst activity ratio) based on the calibration tables loaded in its memory. The calibration tables are compiled according to the results of catalyst sample measurements in a chemical laboratory.

Therefore, the FIZEPR-SW100 dielectric analyzer ensures a reliable monitoring of catalyst quality and activity directly in reactors at temperatures up to 800 ºС and higher.

Sawdust moisture control in the pellet production

April 3, 2014

Finally the comon problem has been solved - now it is possible to control the moisture of wood and saw waste materials. The water meter FIZEPR-SW100 is installed in the box above the conveyor belt. The material is poured from the top and output at the bottom from under the sensor by means of belt movement. It provides constant material renewal and stabilization of its density around the sensor. 

Level alarm for silos with cement

March 12, 2014

The range of bulk materials level alarms was completed with a new modification: SIUR-03В2.4.

This version as well as the SIUR-03В2.3 is designed for use under the gauge pressure in cement silos, but differs by the cable connection: sealed lead-ins are used instead of bolt connectors.

Desined and supported by Formatix Labs

Desined and supported by Formatix Labs

Website is translated by Lingvo-Prof translation agency

Website is translated by Lingvo-Prof translation agency