duct separators for UV lacquers

Transcription

1 duct separators for UV lacquers

2 Important notes concerning duct separators that should be considered when working with UV lacquers Topic: Optimization of duct separators for UV lacquers For decades, industry has benefited from the use of UV lacquers and the advantages this method offers. The advantages of UV lacquers can be summarized as follows: UV lacquers do not contain any solvents and do not produce any paint sludge. UV-lacquer finished surfaces are highly resistant to chemicals and mechanical wear. The UV technology also offers specific advantages in comparison to traditional lacquers, such as improved surface quality and lower energy consumption through very short hardening times. The fact that drying and/or hardening times are no longer required can be considered as the main advantage of UV lacquers because this reduces processing times considerably. All duct separators consist of four filter stages: 1 st stage: X-cyclone, 2 nd : agglomeration filter, 3 rd : X-cyclone, 4 th : pocket filter The housings of the X-cyclones and agglomeration filter are made of stainless steel. Each of the first three filter inserts is fitted with 4 drain holes, each with a diameter of approximately 35 mm. The fourth filter stage is a pocket filter with stainless steel rails instead of plastic rails. The pocket filter is provided with a support that prevents the lower pockets from touching the floor sheeting. The rear main runoff in the bottom of the duct separator has been enlarged to the total size of the cross-section and the cover panel has been fitted with bigger holes in order to improve the runoff of the UV lacquer into the double-deck bottom. The door is fitted with two additional stirrup handles and a safety rope to safeguard it against dropping down. The filters should be dimensioned for an approaching velocity of 1.6 m/s, i.e. for a desired air flow of 4,000 m³/h, for example. The RK2-UV5 should be selected in accordance with the following table:

3 W Type RK2 Desired air flow m³/h in UV lacquer Height H in mm Width W in mm Length L in mm Duct connection* mm h b RXZ basic element ** height x width Approx. weight in kg UV x UV x UV x UV x UV x UV x x570 1 * Duct connection dimensions are internal clearance dimensions; a circumferential frame of 30 mm should be added on. ** For an optional agglomeration stage, please use the same size as for the agglomeration element. If higher air flows exceeding 7,300 m³/h have to be handled, a modular system composed of several units should be used. 160 Delivery: ex works excl. assembly Delivery period: 6 to 8 weeks Prices as follows: Best regards Rentschler Reven GmbH Sven Rentschler

4 Annex 1: Illustrations of the RK2 UV5 on the following pages

5

6

7

8

9 Annex 2: Particle measurement of the filter components fitted into an RK2 2/4200 UV Report on UV-lacquer particle measurement in our test laboratory Location: Test stand REVEN GmbH Testing scope: Particle measurement in CW Spectrum upstream of the separator Spectrum downstream of the separator View of the testing equipment in our laboratory

10 Measuring Method During sampling the following measuring devices were used: Hiac/Royco 5000 Particle counting: Particle counter (0.3 µm - 10 µm) with light scattering and electronic impulses proportional to the particle size emitted by photodiodes. Constant monitoring of 6 particle sizes. Structure Air flow direction Stage 4 Stage 3 Stage 2 Stage 1 Pocket filter RXZ separator Stainless steel RXZ separator agglomeration element

11 Ventilation systems Fixing of the spray gun Spraying of the UV lacquer Effect on the RXZ separator

12 Measuring of the particle spectrum Evaluation of the measuring results Breakdown of Measurement Results The following pages give an overview of the particle analyses based on measurements taken onsite. The analyses initially involve the determination of the numerical particle size distribution and based on this, the determination of the distribution of the masses. Compare the following particle analysis tables:

13 Particle spectrum: measurement 1 upstream of the separators Particle size [µm] Cumulative total Effective total Related to 3-µm particle Mass portion [%] Mass ratio* HIAC/ROYCO- Size DATA 0.3 4,481, , % , ,961, , % , ,485, ,155, , % , , , , % , , , , % , , , , % * Based on a 3 µm particle Total: Particle size [µm] Cumulative total Effective total Total mass [mg] 929,989 Mass portion [mg per m³] 0.3 4,481, , ,961, , ,485, ,155, , , , , , , * Based on a 3 µm particle Total: Particle spectrum: measurement 2 downstream of the separators Particle size [µm] Cumulative total Effective total Related to 3-µm particle Mass portion [%] Mass ratio* HIAC/ROYCO- Size DATA 0.3 1,218, , % , , , % , , , , % , , , , % % % * Based on a 3 µm particle Total: Particle size [µm] Cumulative total Effective total Total mass [mg] 29,986 Mass portion [mg per m³] ,181, , , , , , , , * Based on a 3 µm particle Total:

14 Comparative Graphical Representation of the Degree of Separation Determined Air pollutants in mg/m³ mg/m³ 45, , , , , , , , , , , Partikelspektrum Particle spectrum measurement Messung 1 im 1 in the suction pipe Ansaug 1,3580 Particle Partikelspektrum spectrum Messung measurement 2 nach 2 downstream den Abscheidern of the separators Degree of separation Abscheidegrad= = % 96,77%

15 Schematic Representation of the Decisive Measuring Points Measuring point 2 (cleaned air) Measuring point 1 (untreated gas) Air flow

16 Synopsis If the conveyed air flow is set at approximately 1,700 m³, the following situation results: The evaluation shows an air pollutant concentration of mg/m³. This means that we have to contend with a lacquer mist portion of g/h, which must be separated. If the separator is fitted with the filters specified above, an optimum degree of separation of % is achieved. This equates to a flow of g per hour at a flow rate of 1,700 m³/h with a residual air pollutant concentration in the cleaned air of mg/m³ (which is far below the prescribed value for concentrations at workplaces). Remarks: Ø All mechanical separators that we use are cleanable. Equipment for the separation of UV lacquers (as tested and described in this document) is very well suited for cleaning with high-pressure washers. Due to the consistency of the UV lacquer, however, the cleaning must be repeated at short intervals. Ø We recommend that you keep a set of spare separators and/or agglomeration elements in stock. Ø Thanks to the smooth surface of the RXZ separator and the structure of the stainless steel agglomeration elements, the separated UV lacquer can be recirculated and reused. We have designed all devices accordingly.