Sampling Systems For Various Applications

M&W JAWO Handling raw coal sampling system is an integrated part of the control system available to the power plant operators. The sampling system provides the operator with the means of executing the extraction and preparation of representative samples of the coal. The sample size is suitable for making laboratory analysis.

The M&W JAWO Handling raw coal sampling system operates in accordance with approved international standards.

The results of the laboratory tests performed on the basis of the representative samples prepared by the sampling system are used for: 

• Calculating the payment due for each batch of coal supplied
• Adjusting the coal flow to the mills
• Calculating the amount of by-products from each batch of coal
• Calculating the emissions from each batch of coal
• Calculating the blending of various coal batches to obtain maximum output from the power plant

The system consists of a chain bucket sampler, which is adjusted individually, and of various modules such as vibrating feeders, crushers, dividers, mills, mixers and blowers for return of reject material. Apart from this also service platforms are offered.

In addition to the above, the system can be connected to e.g. a pipe system for delivery of the sample directly to the laboratory. This sample will typically be approx 0.2 liter with a grain size of less than 200 micron.

The Cross Belt Sampler suits the purpose of taking representative samples of granular material being conveyed on a belt conveyor. Representability of the sample is ensured by taking a complete cross section of the material on the conveyor belt.

The Cross Belt Sampler is suited for granulated material, and offers high flexibility in place of installation anywhere along the conveyor belt.

The Cross Belt Sampler principle is compatible with all internationally applicable standards for sampling.

Basic Functionality

The cutting device is the hollow head of the hammer. When a sample is taken the hammer sweeps one revolution across the conveyor whereby the hammerhead cuts through the material stream on the belt. The sample is thereby captured by the hollow hammerhead, which in turn is emtied over the sample outlet.

The hammer is actuated by an electric motor with integrated brake designed to accelerate and decelerate the hammer and return it to its parking position safely away from the material stream.

The Cross Stream Sampler (CSS)

Theory of Sampling (TOS)-compliant which gives every particle in the stream an equal probability to be included in the extracted increment (the key to reliable sampling results).

Enclosed in a cover housing to avoid cross-contamination between successive increments.

Designed to be scalable, which makes it well suited for sampling from high-capacity Bulk Material Handling Systems (BMHS).

Well suited for harsh environments and rough abrasive materials.

Usable as a secondary/tertiary sampler as part of multi-stage sampling system.

The Rotary Tube Divider (RTD)

The Rotary Tube Divider is used for dividing samples of bulk materials. The main advantage of mechanical sample dividers is that, they extract a part of the material by a large number of increments. If, less than about, 50 increments are taken by the sample divider, the accuracy may be substantially reduced. A continuous automatic sample division ensures, that the divided sample is still a representative sample.

General Description:

The dividing tube is rotated by the drive unit. The material is charged through the dividing tube, which passes respectively extractor and discharge cone. The division ratio is step less adjustable. Depending upon model size, it is possible to divide materials up to a particle size of ø65 mm.

The Rotary Tube Splitter (RTS)

Offers a uniform and fully automatic division of material that would otherwise be laborious if carried out manually.

Variably adjustable dividing ratio.

Can be used for mass reduction of virtually any type of material.

Can be used for “duplicate samples” extraction (A, B, C and D samples).

Is easy to install and operate.

Designed with increased accessibility resulting in minimum cleaning time.

Has low maintenance costs.

The Rotary Disc Divider (RDD)

The Disc Divider is used for dividing samples of powder and bulk materials (even suitable for wet materials). The main advantage of mechanical sample dividers is that they extract a part of the material by a large number of increments. If less than about 50 increments are taken by the sample divider, the accuracy may be substantially reduced. A continuous automatic sample division ensures that the divided sample is still a representative sample.

General Description:

The sample has to be delivered on the top cone of the Disc Divider. The sample will be scraped from the upper disc to the lower disc, where it will be scraped to the bottom cone, where a part will go through the sample outlet(s) and the rest will fall through the bottom cone as reject.

The division ratio is step-less adjustable between 1:9 and 1:59 – Depending on particle

size and upon model size. It is possible to divide materials up to a particle size of ø65 mm.

Screw Sampler Mixing Tank (SMX)

The Screw Sampler Type SMX is designed to create an average sample from continuous extraction of dry, non-sticky powdered material from a free falling flow of materials.

General Description:

The continuously operating sampler is driven by a geared motor, coupled to a transport screw

crossing the flow of material. The screw transports the extracted material to a mixing tank, where it is homogenized by mixer wings connected to the through going screw conveyor shaft. The sampler can be delivered with the drive unit installed next to the mixing tank (Type SMX-A500R- M) or for installation on the opposite side of the chute (Type SMX-A500R-S).

The Twin Roll Crusher (TRC) 

Has a solid design and very reliable performance.

Has low maintenance costs and low noise level.

Is adjustable with respect to discharging particle size.

Provides a unique self-cleaning action.

Is equipped with two torque switches to prevent damage should a hard object (e.g. a tool) accidentally be dropped into it.

Twin Roll Shredder (TRS)

The TRS has a solid design and very reliable performance.

The TRS has low maintenance costs and low noise level.

The TRS provides a unique self-cleaning action.

A sieve placed underneath the rolls ensure that only ‘small enough’ particles exit the shredder.

The Vibration Feeder (VF)

It is cost efficient and has low maintenance costs compared to a traditional conveyor belt.

Has a compact design and is well suited when there is space constraints.

Provides accurate dosing of sample material.

Can be used in combination with sieving of material (VF-M)

Dosing Conveyor (DoC)

Specifically designed to transport high volumes of sample material.

Can be engaged in any of the steps of the sampling process.

The DoC can handle higher volume of sample material compared to a Vibration Feeder (VF).

The special design of the DoC reduces spillage.

Bucket Belt Elevator (BBE)

Compared to a conveyor belt the BBE can lift material vertically.

The BBE can handle large quantities of material.

The special design of the buckets ensures high stability and reduced risk of spillage.

Sample Magazine (SM)

The SM consists of multiple buckets.

Thus, a filled bucket does not immediately need to be manually replaced (interim storage) with an empty one saving costs and time.

The design ensures no risk of moisture loss or cross-contamination.

Sample Magazine Long (SM-L)

The SM-L consists of multiple buckets. Thus, a filled bucket does not immediately need to be manually replaced with an empty one saving costs and time.

The SM-L compared to the SM version can be customized with space for additional buckets to meet any requirements for storage capabilities.

The design ensures no risk of moisture loss or cross-contamination.

The access door is fitted with a safety switch that deactivates the turntable and allows safe removal of the buckets.

Control Cabinet (CC-C)

Tailor-made solution that perfectly matches the JAWO equipment and ensures optimal operation.

M&W has electrical engineers inhouse that design, construct, wire-up and test the equipment (FAT) before shipment.

M&Ws electrical engineers and mechanical engineers performs the supervision, installation and commissioning locally at site and thereby ensures a fully operational and optimized solution..

Control Cabinet (CC-S)

Tailor-made solution that perfectly matches the JAWO equipment and ensures optimal operation.

M&W has electrical engineers inhouse that design, construct, wire-up and test the equipment (FAT) before shipment.

M&Ws electrical engineers and mechanical engineers performs the supervision, installation and commissioning locally at site and thereby ensures a fully operational and optimized solution.

Unburned Carbon Online Analyser for Biomass (UBC-3000)

Particle Sampler (PS)

·        The PS performs fully automatic sampling of powder or dust particles.

·    The unit can be easily operated from the man-machine interface or from a central control room.

·    In the case of analysing fly-ash samples for levels of UBC (unburnt carbon), the operator may use the information from the PS to optimise the combustion process with respect to fly-ash quality.

The patented ACFM-2200 is a fully automatic on-line sampling and monitoring unit. It provides real time data for better combustion performance and fuel economy.

The technology is based on ISO 9931 isokinetic and representative extraction of samples in fuel pipes between the mills and burners. 

Samples taken are returned into the fuel pipe or at preset times collected in exchangable containers as per requirement. 

The flow measuring results are electronically transmitted to the control room monitors. 

The ADS is an instrument for extracting samples of ash in flue gas. The ADS operates automatically during all operating conditions and continuously provides samples for evaluation of the boiler efficiency.

Principal and process features:  

• Continuous sampling
• Durable, non-mechanic sampling device
• Minimum of maintenance and supervision required
• Easy to install and simple to use
• All vital parts are manufactured from stainless steel

The ATD is an electric driven valve trimming the flow of coal in the fuel pipes from the mills to the burners.

The ATD is flanged into the fuel pipe.

On receipt of an electric signal the damper will operate in the direction of openning or closing.

The opening/closing flaps are made from special wear resistant material.

The signal to operate the trimming damper can be generated "manually" from a push button or automatically from a communication box translating actual flow measurements from the flow monitor into signals for the ATD for the purpose of balancing the flow in all feeder pipes.

The FAS is an automatic sampling device, used for collecting dust samples in transport pipes, where the ash is conveyed pneumatically.  

The fly-ash sampler can be installed directly in the transport pipe or in the pneumatic transport hopper.  

• The FAS is a very reliable and low maintenance instrument, with a sampling device manufactured from stainless steel
• The FAS is automatically collecting samples at pre-set intervals
• The samples are accumulated in an exchangeable container

The Pulverized Fuel Sampler (PFS) is a portable instrument designed for sampling and flow measuring of pulverized coal in the fuel pipes between mills and burners. The Pulverized Fuel Sampler complies with the ISO 9931 standard for sampling of coal conveyed by gases.

The Pulverized Fuel Sampler is introduced into the fuel pipe through an airlock (Dustless Connection), and the coal sample is collected in an exchangable container attached to the sampler. 

Application areas:

• Extracting of isokinetic and representative samples for determining of particle size of coal and other parameters.
• Routine and special measurements of coal flow in fuel pipes.

The  PFS-A is a portable instrument designed for sampling and flow measuring of pulverized coal in the fuel pipes between mills and burners, according to ISO 9931.

The sampler is introduced into the fuel pipe through an airlock (Dustless Connection), and the coal sample is collected in an exchangable container attached to the sampler. The sampling probe is connected to an electric motor which enables it to rotate. A PLC in the control box ensures isokinetic extraction, and calculates the coal flow in the pipe.
The PFS-A is operated by only one person.

Application areas:

• Extracting isokinetic and representative samples for determining of particle size of coal and other parameters.
• Routine and special measurements of coal flow in fuel pipes.

The RCA 2000 is an on-line analyser for carbon content in ash or LOI. The instrument provides the operator with vital real time information about the combustion efficiency through continuous monitoring of the unburned carbon content in the fly-ash.