Caldyn Apparatebau GmbH products

The nozzle CSL and the principle of atomization developed by CALDYN has been proven as avery economical spraying technology. Liquid and gas are mixed at low velocities in a mixing chamber and accelerated to the sonic velocity of the two phase mixture (patented in 1976). The atomization is achieved by the pressure jump at the outlet of the nozzle when the mixture is expanded in a gas. The largest stable droplet can exactly be defined! The angle of atomization of a single CSL nozzle is 15°, therefore the atomization can be realized in very small channels. For larger flow cross sections and any injection geometry several nozzles or nozzle clusters can be used.

CALDYN delivers full cone nozzles and complete nozzle lances made of stainless steel. Other materials or nozzle types can be offered on request.

Nitrogen oxides that cause pollution of the environment are converted to nitrogen and water by adding a reducing agent (urea solution or ammonia). With the SCR process the reducing agent is injected at comparatively low temperatures and the nitrogen oxides are reduced to molecular nitrogen using a catalyst. With the SNCR process the reducing agent is injected directly into the hot flue gas at temperatures of about 950 °C. The reducing agent reacts with the nitrogen oxides to water and nitrogen. The advantage of this method is the low capital investment. Retrofit is possible easily.

Application: The CALDYN scrubber CALWIR is used for the efficient cleaning of industrial exhaust gases. Dust particles, aerosols and acid pollutants are safely removed out of gas streams.

The MULTIWIR packings consist of adjacent layers formed by straight strips. Alternate layers of the packing consist of strips of opposite inclination. The incoming gas stream with droplets/particles passes the packing and is divided into a large number of smaller streams. Crossing each other spatially they induce rotational motion in each other. Depending on the geometry of the packing, the rotation frequency of these vortices can amount to 400 per sec. are generated. Due to centrifugal forces the droplets/particles settle down at the surface of the strips. The vortices also increase the heat and mass transfer as well as the flow equalizing in a MULTIWIR packing.

Flüssigkeitstropfen werden mittels Water droplets are atomised into the gas stream by CALDYN two-phase nozzles CSL. The water droplets evaporate using the heat out of the flue gas. Lump formations at the tower walls are avoided by using a CALDYN flow equalizer MULTIWIR. MULTIWIR provides a uniform gas flow parallel to the tower/duct axis. The outlet temperature variations can be reduced down to +/- 5 K by optimal coordination of atomizing technology, temperature measurement, temperature controller and the water regulating system.

Suspensions/solutions are atomized into the flue gas by CALDYN two-phase nozzles CSL. The gases are cooled down by evaporation of liquid/water. Lump formations at the tower walls are avoided by using a CALDYN flow equalizer MULTIWIR. MULTIWIR provides a uniform gas flow parallel to the tower/duct axis. A safe and efficient operation of the evaporator is achieved by optimal coordination of atomizing technology, temperature measurement and temperature controller.

Liquid carbon dioxide is taken from a tank, completely evaporated in the evaporator and fed to the point of use. In order to ensure safe defrosting of the evaporator, two units connected are operated in parallel. The units are switched over at specific intervals using a time switch. While one unit is in operation, the other one is being defrosted. The only energy consumption of this evaporator at temperatures higher than + 5 °C is for the blowers for air flow through the evaporator.