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Luhrfilter Ltd

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0121...

Unit 1, Crompton Court,
Burntwood Business Park,
Attwood Road,
Burntwood,
Staffordshire,
WS7 3GG,
United Kingdom

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Products / Services

Bag Filters

Our range of flat bag fabric filters comprises both horizontally and vertically mounted filter elements. Filters can be supplied with a number of cleaning device alternatives, the selection of which is dependant on application and plant sizing.

The range of cleaning devices available is:

Model MWF
Compressed Air 'semi-offline'
Model DWF
Medium Pressure 'semi-offline'
Model DF
Compressed Air 'On-Line'
Model DFK
Compartmentilised 'Off-Line'

Tubular Heat Exchangers

The Flat Tube Heat Exchanger is an air to air heat exchanger operating on the principle of forced draught convection. Process gases pass over the outside surfaces of the heat exchanger elements. Cooling air is generated from ambient air by axial or centrifugal fans and blown along the bores of the heat exchanger elements thus promoting the exchange of heat.

Dependent on dust characteristics and quantities the Heat Exchanger can be equipped with a cleaning device. This cleaning device ‘wipes’ the surfaces of the heat exchanger elements and removes excessive dust, thus maintaining the efficiency of the heat exchanger.

Evaporative Coolers

This unit is in the form of a vertical cylindrical vessel into which spray nozzles are inserted. The spray nozzles are used to inject atomised water droplets into the process gas. Water is atomised in the spray nozzles using either compressed gas or air. The evaporative cooler can be used to cool process gases from 800 deg. C whilst the Flat Tube Heat Exchanger has a maximum inlet temperature of 550 deg. C.

Sorption Procedures

LÜHRFILTER has developed different procedures for the following applications:
Chemisorption of acidic pollutant gases such as HF, HCl and SO2, with Ca- or Na-based additives
Adsorption of PCDD / PCDF as well as Hg and Hg compounds by means of activated carbon / activated coke or other additives with large internal surface
It has been proven that the implementation of high additive particle re-circulation rates, especially when using Ca-based additives, leads to a significant improvement in the separation rate for acidic pollutant gas components such as HF, HCl and SO2 and/or to a reduction in the amount of additive added.

Maintenance/Inspection

Nowadays all industrial production processes are subject to comprehensive requirements regarding environmental protection. A high availability of the air pollution control plants integrated in the process is compulsory necessary for this. Even after commissioning and take-over of gas cleaning plant, LÜHRFILTER offers you an extensive package of support and maintenance services.
A specially trained team is among other things available for the following services:
Inspection of plants, if necessary also in connection with contractually agreed several years’ maintenance contracts
Plant maintenance during scheduled downtimes
Troubleshooting
On-site measurements
Support service and training of operating staff

Assembly

LÜHRFILTER provides of a competent team for the implementation of mechanical and electrical installation works. We lay special emphasis on the fact that each construction site will be supervised by at least one member of our assembly staff. For many years we are working together with partners, who provide skilled assembly staff for our company.

Our professionally qualified assembly crews supervise and attend all projects from the first assembly works at the location of project until the final acceptance of plant.

MWF Travelling Medium Pressure - Semi-Offline Cleaning

The cleaning of the flat-bag rows takes place sequentially in steps by means of a cleaning device, travelling within the clean gas chamber. The cleaning air is injected into one row of the flat-bag filters by means of a medium pressure fan, while the two flat-bag rows adjacent to the cleaning row are not under the normal extraction IE Isolated durring the cleaning process. A lip seal along the carriage travel path serves as a reliable sealing method,proved while in continuous operation.

This cleaning system does not require any compressed air.

DWF Travelling Compressed Air - Semi-Offline Cleaning

The cleaning of the flat-bag rows takes place sequentially in steps by means of a cleaning device, travelling within the clean gas chamber. The cleaning air is injected into one row of the flat-bag filters by means of compressed air, while the two flat-bag rows adjacent to the cleaning row are not under the normal extraction IE Isolated durring the cleaning process. A lip seal along the carriage travel path serves as a reliable sealing devise, proven while in continuous operation.

DF Compressed Air - ''Online'' Cleaning

The cleaning of the flat-bag rows takes place sequentially in steps by means of a cleaning controller or PLC, The clean Chamber is provided with vertically mounted compressed air injectors, arranged in front of each row of filter bags. Compressed air and secondary clean gas air is injected into two adjacent bag rows. Injector tubes are designed in accordance with aerodynamic principles. The bag rows are cleaned by this combination air contrary to the normal filtration flow. Thus removing the particle cake from the filter media. This is proven while in continious operation.

DFK Compressed Air - Offline Cleaning

DFK Compressed Air - Offline Cleaning
This cleaning process uses compartmentalisation of the filter housing clean gas chamber. Each chamber is connected with the clean gas collective channel and can be isolated. At the beginning of the cleaning process in one chamber, the corresponding isolation damper on the clean gas side will be closed. The flat bags are cleaned during interrupted filtration process by means of compressed air pulses.

Stand Alone Filters

As well as complex filtration plants, Lührfilter can also supply smaller stand-alone filters for basic extraction systems, such as LEV Filters or Silo Venting Filters. We also manufacture our DF Kompact Range, which are ideally suited to lower air volumes.

Silos

Lührfilter have the capability to design and manufacture bespoke storage silos, as a part of filtration systems. Typically these can used for the storage of gas conditioning additives, such as Activated Carbon, Hydrated Lime and Sodium Bicarbonate. Additionally we can also design and supply storage silos for the residue dust collected by our filter systems. Silo designs include venting filters, over / under pressure relief valves, silo level measurement, filling lines and discharge valves or loading spouts. Trace heating and thermal insulation can also be fitted to prevent condensation issues.

Special Design Extraction Hoods

Lührfilter can design, manufacture and install bespoke extraction hoods for a broad spectrum of industrial applications. Special designs include hinged and automated hoods, to maximise the capture capabilities, but also allow free access for operatives and maintenance

Control Panels

Lührfilter have in-house capabilities to design and manufacture control panels for complete plant control. These designs can incorporate complex control functions, inverter control of electric motors, PLC manufacturers based on client preference, differential pressure, temperature and flow velocity measurement. Generally our panels are fitted with project specific HMI’s to provide easy functionality and plant monitoring.

Fans

Lührfilter supply high quality centrifugal fans for our filter systems. These can be supplied as direct drive, belt drive or direct coupled variants. Accessories such as anti-vibration mountings, flexible connections, acoustic / thermal insulation and discharge silencers can also be provided.

Dampers

A full range of bespoke automated control dampers can be supplied with our equipment. We design and manufacture these in-house, which can be mild steel, stainless steel construction or refractory lined for high temperature applications. Operation can be manual, electrically actuated or pneumatically actuated.

Valves

A full range of slide gate valves, double flap valves or rotary discharge valves can be supplied for control of dust discharge and to provide an air lock for our filter systems.

Ducting & Exhaust Stacks

Bespoke flanged ducting systems can be designed, manufactured and installed by Lührfilter for our filtration plants. These can be mild steel, stainless steel construction or refractory lined for high temperature applications. All ducting systems are specifically designed to reduce system pressure drops and ensure correct gas / air velocities. We can also supply free − standing exhaust stacks as part of our scope of supply.

About us

Lührfilter Ltd, a wholly owned subsidiary of Lührfilter GmbH, specialise in gas cleaning systems and dust & fume extraction systems from supply only to turnkey systems with an option of five vertical or horizontal filter elements to choose from providing online or off-line cleaning for gas processing applications.

As a specialist in filtration, Lührfilter GmbH design, supply and install technically advanced filtration systems that allow users to collect particulate and dust, with the option for conditioning systems to remove acidic gases, heavy metals and dioxins by gas adsorption.

Lührfilter also manufacture forced convection heat exchangers for high temperature applications. In addition, our dry gas absorption systems enable the reduction of acidic elements, dioxins and heavy metals.

Our Product Range Includes:

Flat Bag Filters & Cleaning Systems − a flat bag which can be mounted both horizontally and vertically to filter elements.

- Model MWF − Compressed Air ‘Semi-Offline’.
- Model DWF − Medium Pressure ‘Semi-Offline’.
- Model DF − Compressed Air ‘On-Line’.
- Model DFK− Compartmentilised ‘Off-Line’

Flat Tube Heat Exchangers − an air to air heat exchanger operating through forced draught convection.

Evaporative Coolers − an evaporative cooler unit with a vertical cylindrical vessel where spray nozzles are inserted to inject atomised water droplets in process gas.

Conditioning Rotors & Additive Systems

Mobile Bed Absorbers

Ancillary Components − including Stand alone filters, Silos, Special design extract hoods, Control panels PLC & HMI, Fans, Dampers, Valves and Ducting.

We serve a wide range of industries including Waste to Energy, Biomass, Steel, Non Ferrous Metals, Glass, Lime, Aggregates, Chemicals, Incineration, Ceramics & Cremation.

Services Carried Out by Lührfilter Includes: