KNV - Catalytic Air Purification System

Catalytic air purification systems have been part of the KBA CleanAir product range for more than 40 years. By using heavy-duty catalysts based on a mixture of oxides or noble metals, it is possible to adapt to the different customer requirements. The catalysts generally have a service lives of more than 30,000 operating hours. Areas of Application: The catalytic method is particularly suitable for widely fluctuating concentrations of hydrocarbons, where there is little need for waste heat. By using the H-KNV series, concentrations up to 18 g/mN³ can be treated. Airflows containing chlorine can also be treated without the risk of producing dioxins. Description of the process: With catalytic exhaust air incineration, the reaction temperature needed for complete combustion when using a suitable oxidation catalyst can be reduced to approx. 280 - 320°C. This means the primary energy requirement is substantially lower than the required by thermal exhaust air incinerators

RTO-Regenerative Thermal Oxidiser

The regenerative thermal method combines flexibility with cost effectiveness and is state-of-the-art in the industrial exhaust air purification area. This system is distinguished by its operational reliability, ease of handling and low maintenance costs. These systems are often successfully used today even in applications with low pollutant concentrations (such as odour removal). Areas of use: KBA CleanAir RTO systems are suitable for a wide range of applications. Ideal conditions are exhaust air flows, with low to medium solvent concentrations, where no or minimal additional waste heat is required. With this method, autothermal operation (operation without the need for additional primary energy), is possible with solvent concentrations as low as 1.2 g/m³. The RTO is still very cost effective at lower concentrations because the internal heat recovery is so high, up to 98%. Description of the process: The solvents contained in the exhaust air are oxidised to produce carbon dioxide and water vapour in a combustion chamber at temperatures from approximately 800 to 830°C. The internal heat recovery is achieved in this case by using the highly effective ceramic heat exchanger system, XtraComb Ž, developed by KBA. This is flushed through alternately with clean gas and raw gas so as to absorb as much of the heat energy from the hot clean gas and transfer the energy to the cold raw gas. The regenerative method is an intermittent process, were the exhaust air flow is switched over cyclically, providing a energy transfer between the hot clean gas and the cold raw gas. KBA CleanAir systems are designed to minimize operating costs. They are always customer optimized e.g. using special control systems according to the operating conditions in each case, in order to maximise efficiencies and minimise operating costs. Various series are available with this method depending on the application: 2-canister 3-canister Small systems: RTOcompact RTO in 3-Canister-Design The most well-known regenerative system is the 3-canister system where the exhaust air being cleaned is switched over cyclically between three canisters (raw and clean gas or purge canister). This method meets the highest standards and guarantees minimum clean gas values.

TNV - Thermal Recuperative Air Purification

At the beginning of the 70's, LTG (now KBA-MetalPrint) was already building the first integrated thermal incinerators, for the dryers in painting and printing installations. Since then, more than 1,200 of these systems have been installed worldwide. Areas of Application: Thermal air purification systems, with recuperative exhaust air preheating, are particularly suitable for applications with small to medium-sized exhaust air flows and high hydrocarbon concentrations, as well as a need for secondary heat recovery. Problematic exhaust air flows, e.g. with high dust loads or a tendency to produce condensates, can also be treated using this tried and tested, universal method. By using effective heat recovery systems, e.g. for steam, hot-water production or applications involving heat transfer oils, TNV systems are still cost effective today for many applications. Description of the method: With this exhaust air purification method, the process air to be cleaned is first preheated as it flows through the integrated bundle heat exchanger and then almost completely oxidised to form carbon dioxide and water vapour at temperatures, ranging from about 720 to 750°C. The burner output required for this is controlled automatically depending on the calorific values of the pollutants and their concentration.

ZEROclean Concentration System with Thermal Post Treatment

Using a combination of concentration and thermal post treatment is a particularly cost effective way of cleaning large-volume exhaust air flows with low hydrocarbon concentrations. With a combination of these systems, the total investment and, operating costs can be significantly reduced in comparison with using a thermal process alone. Typical applications are exhaust air volumes from approx. 30,000 Nm³/h with solvent concentrations < 1 g/Nm³. For this process combination to work successfully, the temperature of process exhaust air must be < 40°C, the relative humidity < 80% and the exhaust air must be largely free of dust. Description of the process: Exhaust air flows with low organic solvent concentrations, are cleaned to the required limits by using a continuously operating rotor made of hydrophobic zeolite which absorbs the solvents. The adsorbed solvents are continuously de-absorbed by a much smaller hot air stream which is finally treated by a compact installation (thermal, catalytic or thermal-regenerative) downstream. This reduces the size of the exhaust air purification system needed downstream by 90-95% – and, of course, the corresponding investment costs