Luhrfilter Ltd

As technology partner LÜHRFILTER offers all component parts necessary for the solution of applications from the gas and particle collection up to the stack. In combination with different, self-developed sorption procedures we find new and innovative solutions.

The design features of the horizontally or vertically installed flat-bag filter elements especially in combination with the different -off line- cleaning systems included in the range of products allow

• the reliable observance of requested residual particle contents in the clean gas

• long filter fabric service lives

at low space requirement and low maintenance.

Flat-tube heat exchangers are generally installed upstream of flat-bag filters in order to reduce the temperature of the gases to be cleaned to a temperature admissible for the filter fabric or to adjust the optimum process temperature.

During development of this heat exchanger special importance was attached to the objective to achieve a reliable continuous operation, combined with a constant cooling of gases, even in the case of high particle loads in the gas and a strongly adhesive character of these particles. Regular manual cleaning proved to be unnecessary for maintaining the heat transfer.

If necessary, we are taking additional measures to ensure a trouble-free continuous operation of the flat-tube heat exchanger and exceptionally long service lives of cooling tubes.

During the evaporative cooling liquid droplets are injected into the gas flow by means of spraying lances, serving for the heat reduction of gas during the evaporation process. A reliable operating mode of cooler requires the complete evaporation of droplets at low temperature fluctuations at the cooler outlet. The main features for a safe design of an evaporative cooler are:

• Spraying technology

• Homogeneous gas flow through the evaporation zone

• Control technology

In most of the cases two-component nozzles (water and compressed air) are used for the spraying. As an alternative, one-component nozzles can be used. This, however, requires conveying pumps with a definitely higher pressure rise.

For corrosion protection and for the separation of acid crude gas components, a sorption agent such as lime slurry or sodium hydroxide solution can additionally be injected into the evaporative cooler together with water and compressed air, if necessary. In case of use of sorption agents and due to the longer evaporation times of injected liquids, the size of evaporative cooler/spray absorber has to be adapted accordingly.

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.

The LÜHRFILTER Conditioning Rotor – Recycle Process enables the operationally reliable re-circulation of large re-circulation quantities, even if problematic particles such as CaCl2 are present in larger quantities in the particle spectrum. A largely homogeneous mixing of the recycled particles with the flue gas flow is achieved. Pneumatic conveying systems, which are often susceptible to faults, are not required. 

LÜHRFILTER offers you a wide range of support services starting with project conception via assistance during project realisation through to provision of services on site. Our qualified, purpose-trained staff of the different technique and service departments will be pleased to assist you.                        

LÜHRFILTER offers you all services required for a professional project realisation from the project study via the project handling and services on site through to support services after commissioning of plant.

More than 80 highly qualified members belong to our technical team in the departments process technology, project realisation, mechanical and electrical project handling, commissioning and service.

In our office we are using up-to-date software such as AUTOCAD, Inventor, ELCAD, EPLAN, MS-Project as well as different programming languages for the plant control. In addition, we are also realising flow simulations – CFD (computational fluid dynamics) – for the optimisation of flow procedures together with external institutions.

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.

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

LÜHRFILTER is a competent partner not only for the technical design and planning of a flue gas treatment plant but also for the realisation of all requirements of electrical engineering and/or automation technology. Whether new turn-key plant, integration into an existing process and control system or even conversion/upgrading of out-of-date automation technology, you will profit by LÜHRFILTER as system integrator.

Our spare and wear part management team will provide the assurance of your plant availability.

Based on our experiences we will prepare a recommendation for the storage of spare and wear parts, particularly provided for your plant.

Filter bags and other essential spare parts of filtration plants will be manufactured in our shops. In doing so we grant the provision of original spare parts, considering high quality demands.

As a result of our high vertical range of in-house production we can quickly and flexibly react on your requirements. By this we are manufacturing more than 30,000 filter bags per month, a large part of this being used for installation in plants in operation.

Spare parts and particularly also the flat-bags will be supplied with a new life time warranty. 

Besides the delivery of spare and wear parts, our scope of services also comprises of course the optimisation of plant operation, based on your and our experiences