PRIDNEPROVIE'S SCIENTIFIC - EDUCATIONAL AND INFORMATIVE

CENTER FOR CLEANER PRODUCTION (PSEIC)

P.O.B. 4159, Dnepropetrovsk-30, , 320030, Ukraine

Tel: (+380 56) 778-.648, fax: (+380 56) 244-7668

E-mail:

1.SUMMARY

Essence of the object without uncovering of the main substance of "know how"

Electroaerozole particles' movement is governed by the laws of electric charges' movement in electric, magnetic and electromagnetic fields. At the expense of this the effects of electroaerozole particles' deposition at different surfaces are obtained.

Non-traditional methods of the cleaning of gases of hard and liquid dispersed particles and also of waste gases (sulfur and nitrogen oxides) are: electric preparation of purified gases; high voltage supply to the filter's system; thermal diffusion foresees.

In difference of usual design we use for the getting of charged particles not only clean sorption liquids but also previously formed liquid-gas mixture. It allows to expel of sedimentation of solid particles at elements of the equipment. The use of self-induced oscillation at electroaerozole's generation and forced electrode position provides with high service index.

The high-voltage device (HVD) consists of 3 components:

• Control block ( CB )
• High-voltage converter ( HC )
• Connecting cable ( CC )

The CB forms a low-voltage, which is necessary for the HC. The HC is places near from a working body and will transform a low voltage in a high voltage.

Main feature of the HVD:

• The high voltage will be formed directly at a working body, that provides high safety (absence high-voltage cables);
• The double system of protection from a spark is based on stabilization current and on switching-off HVD at approach working body to ground details;
• The stabilization of a current is provide at optimum technological mode;
• The original construction of the HC is provide at small dimensions, weight and high reliability for it. Besides that, the construction of the HVD is provide the high efficiency for autonomic units.

Target voltage.................................... 40 kV

Target current.................................. 150 mkA

Input voltage of the CB ...............  DC 12V Max.

Input power................................... 10 VA.

Besides of high describing spheres of using our equipment and technology we use for industrial painting with electrostatic field of high voltage for liquid paint raw material. The equipment can be used in industrial painting conveyor with increasing efficiency of paint raw material to 95 per cent.

The maximum effect of this method employing was obtained with conveyor painting of large production with the little area of surface (grids, frame etc.). The special effect of electrostatic painting was to paint total area of production with sprayer from one side.

The complex of equipment for electrostatic painting consist of:

• Sprayer with the high speed rotation cup WR-30 providing the high quality of coating with dispergation of paint raw material on the rotating cup with rotate speed of 30000 turn per minute,
• Electronic high voltage device "Crown-120-2" creating electrostatic field of high voltage with protection of fire. Our equipment - is a result of long-term investigations. The some original ideas and "know how" provide the reliability and safety for our units. The sprayer is made as an air turbine with high rotation speed, which established on bearings. On a turbine is fixed dispergation cup. The unit on two-cascade bearings permits to reach large durability of work of bearings ( design is protected by patent). On a system of channels in dispergation cup can move a paint raw material or a dissolver. For formation of the form of spray paint raw material an additional air channel is stipulated.

Pressure of compressed air .................. 0.2-0.3 MPa

Dimensions of sprayer ......................... 135 * 100 * 100 mm

Weight of sprayer ................................ 1.8 kg

The high-voltage device (HVD) is similar of high described and also consists of 3 components: control block ( CB ), high-voltage converter ( HC ) and connecting cable (CC ). The CC serves for electrical connection the CB and the HC (with voltage 24V). The electric installation has the same advantages as high described in comparison with similar ones in developed countries.

Target voltage .................................... 120 kV

Target current .................................. 150 mkA

Dimensions of the HC ...................... 60 x60 x315 mm

Weight of the HC .................................. 1.2 kg

Dimensions of the CB ................... 320 x285 x140 mm

Weight of the CB ................................. 3.5 kg

Max. length of the CC .............................. 20 m

Input voltage of the CB ........... AC 220V + / -10%, 50Hz

Max. input power ................................... 20 VA

The developed electrocharging attachments can be used in all types of the sprayers.

2. The level of realization of the object in the industry is testing and partial inculcating in productions at the chemical, agricultural and machine-building plants of the FSU.

Electroaerozole equipment and methods are used in some spheres. Electroaerozole methods are the future of the resource-savings in the field of: protection of agricultural productions (permits to reduce of the consumption of chemical weed-killers and pest-killers in 5-6 times); purification of industrial gas from dispersed particles (detection effectiveness of the process increases to 99.9 per cent), purification of gases from nitrogen, sulfur and carbon oxides, (detection effectiveness to 60 per cent); improving of the quality of the paint coating; intensification of reaction (among them oxidation ones) and mass transfer processes.

The first of all it is the garden and kitchen-garden splashers with electric charge of the drops. The modules for electric charge are created to garden and kitchen-garden splashers, ensuring ecological cleanliness of the food, reduction of environmental pollution, reduction of the norms of the chemical reagents' charge in 5-6 times.

The electrocharging attachment of the sprayers has been tested under pilot-scale-industrial conditions and recommended for its wide application.

3. The main technical and economical results of realizations. Our method gives the improving of the quality of coating, allows to reduce the amount of paint raw material and to reduce the quantities of wastes.

Only in Ukraine there are about 15 mln. garden and kitchen-garden sites in individual use, which require of the processing by chemical reagents. Plashers, equipped by electric charge modules, exclude of chemicals hit in the ground and permit to reduce of the accepted norms of the charge of chemicals in 5-10 times. A profit on sale one module to splashers for electric charge makes $10-20. A profit in the first year of work of the enterprise can make $500 thousand at volume manufacture from requirement only of the Ukrainian market in 10%.

Main features of the HVD:

• The high voltage will be formed directly at a working body, that provides high safety (absence high-voltage cables);
• The double system of protection from a spark is based on stabilization current and on switching-off HVD at approach working body to ground details;
• The stabilization of a current is provide at optimum technological mode;
• The original construction of HC is provide at small dimensions, weight and high reliability for it. The presence of excess electric charge leads to the activation energy change and to the mass transfer and reaction processes acceleration, to the change of physico-chemical properties of many substances.

4. Desired forms of the exit in the west market of high technologies. We will deliver sprayers WR-30 with high voltage device "Crown-120-2" or separately. We search for the business partners for joint activity on mutual beneficial conditions.

Information supplied by the Author April 1999.  Page last updated: January 19, 2004