Conveying abrasive solids

KHN Tech CZ and its history is connected with searching for and development of technical solutions to extend the service lifetime of the technological equipment using a wear-resistant basalt. Systems of pneumatic, hydraulic and mechanical transport of solids fall within the area where solutions with basalt or other types of ceramics started to be applied worldwide several decades ago.

Origins of the company are thus connected with working of running plants and searching for a solution of the problematic part of the technology in terms of the service lifetime. When already at the plant, solving protection against abrasion, customers requested further support and assistance with troubleshooting the operational problems caused by design errors of the original supplier comprising e.g. improperly chosen technology, unsuitable pipe routing or incorrectly setup conveying velocities.

From the very beginning, our company worked at power stations, heating plants, metallurgical works, coking plants, mines, cement works or lime plants, solving operational problems and modification of the technology, most often financed from limited maintenance budgets. This forced us to look for cost-effective solutions, but still functional with maximum preservation of the existing equipment. What was the necessity first, became a standard approach that was established in our company policy, and we dare to say that this distinguishes us from most of our competitors.

The history of our company provides an extensive information based on operational experience from applications of various equipment manufacturers of solids conveying systems. We are continuously maintaining our overview of what is offered on the market, what equipment from which manufacturer works well and reliably and which do not work as expected. Thanks to this experience, we transformed from the original service and maintenance provider to the supplier of complex systems, from the elaboration of the design documentation all the way to the delivery, installation of commissioning.

In terms of repair, reconstruction or modernisation projects, we offer a complex approach comprising

Onsite aiming of the as-built status.
Assessment of technical and economical parameters of the operations.
Proposal of modifications including detail design documentation.
Delivery of the new equipment including installation works.
Optimization of the technology operation and cooperation during implementation of the control system algorithms.
Regular inspections of the equipment.

We always stand firm on the quality of our work. We guarantee the quality of our work not only contractually, but we are also insured against damages caused amounting to 2.800.000 EUR, for the territory of entire Europe.

Pneumatic transport

We offer extensive experience with various applications for below stated fields and types of conveyed solids

POWER AND HEATING PLANTS

Fly ash handling, industrial vacuum exhausters to suck off fly ash or FGD products, round design of pulverised coal pipes to coal burners, lime handling for FGD plants, sand/inert material transport to the fluidised-bed boilers, biomass handling.

FOUNDRIES

Transport of moulding and foundry sand, scale exhausting, blasting sands.

GLASSWORKS

Transport of glass sand and glass cullet.

LIME PLANTS, CEMENT WORKS

Transport of products, furnace dust, fly ash and alternative fuels.

WOOD PROCESSING PLANTS

Woodchip and sawdust transport.

For application with pneumatic transport with over-size particles and request for long lifetime, we use our special, patented square elbow lined with basalt or ceramics, which can also be fitted with a residual lining lifetime measurement. This allows timely detection of the forthcoming wear through of the lining and thus proper planning of elbow replacement within planned outages.

Except many standard applications within both green field and brown field projects, we can solve also very specific technological problems that needs a made-to-measure solution, such as

Design, delivery and assembly of special terminal boxes in fly ash pneumatic pipelines to slow down inlet velocity into silos from 35 m/s to as low as 4 m/s
Design, delivery and assembly of special inspection pipe pieces, lined with basalt, for pneumatic transport of wood chips and saw dust
Modification of inlets into cell feeders with water detection, automatic drainage and separation of oversize particles

Special hexagonal elbows with antistatic plexiglass covers for pneumatic transport of saw dust
Special modification of ejectors with implementation of concentric air injection
Modification and lining of IBAU fly ash pump with basalt

HYDRAULIC TRANSPORT

In the area of hydraulic transport, we dispose of necessary experience from various projects in below mentioned fields and type of transported materials

POWER AND HEATING PLANTS

Slag and fly ash handling, dredge stations, hydro-cyclones to thicken the slag, river water and raw water pipe lines, limestone milk pipelines

METALLURGICAL PLANTS AND STEEL WORKS

Blast furnace slag transport, water drainage from blast furnace gas cleaning process, fine sludge exhaust systems, scale floating

MINES

Transport of tailings from mining copper and iron ores, transport of sand and gravel including pontoon pipe lines

Like in case of the pneumatic transport, also in the field of hydraulic transport we successfully solved technical problems that required a very specific, measure-to-made solution, such as

Patented system to eliminate transmission of vibrations from the pump to the outlet piping
Patented system for absorption of dynamic impacts
System of pumping deep-mined water from and to 1 km depth, realised for OKD mines
System of fly ash hydraulic transport through the underground pipeline system across the commercial and historical zone of the Dolni Vitkovice area, in the city of Ostrava, Czech Republic

MECHANICAL TRANSPORT

As for the mechanical transport, we offer our experience with below stated types of applications

COKING PLANTS

Chutes, ramps and coke quenching

METALLURGICAL PLANTS AND STEEL WORKS

Flip-flop boards of skip trucks, design and manufacture of basalt-lined skip trucks, modification of the blast furnace receiving hopper (shape modification including ceramic lining)

MINES AND COAL CLEANING PLANTS

„Drewboy“ for separation of tailings

POWER AND HEATING PLANTS

Servicing coal handling system (conveyors, classifiers, crushers, etc.)