Hayden’s Technical Comparison with Other Design Companies—Drying Oven

Release time:

2013-07-23

Hayden air-flow mixing type—other suppliers’ conventional circulating types: circulation frequency 16 cycles/min vs. 2 cycles/min; body temperature difference no greater than 50°C vs. no greater than 110°C—especially effective in addressing insufficient heating at the bottom of the car body, where corrosion is most likely to occur. Operating costs are lower when large circulating fans are not used, resulting in lower energy consumption; using large circulating fans significantly increases energy consumption. The heating zone employs fully contoured radiant panels, ensuring uniform heating throughout the vehicle—same as the left side. Maintenance involves only a few high-temperature dampers; the piping system is complex and makes rapid heating difficult. Generally, duct lengths are very short, matching the length of the drying tunnel. Design is complex, with a short commissioning period. Separate-type exhaust gas treatment systems are available; integrated exhaust gas treatment systems are also available. Serial number Content General factory configuration Hayden configuration 1 Wall panel: foam plastic, steel plate thickness only 0.5–0.6 mm; rock wool density 140 kg/m³, steel plate thickness 1.0–1.2 mm. Insulation performance and service life differ; does not meet fire safety requirements. High-temperature sealant: during wall panel installation, either no sealant is used or domestically produced sealants containing “silicon” are used. It is crucial to use imported high-temperature sealants free of “silicon” when installing the drying oven. Sealants containing “silicon” can lead to long-term problems with coating quality. 2 Internal circulating ducts: typically made of galvanized steel sheets from general steel mills, with sheet thickness of 0.8–1.0 mm and zinc layer thickness of 50–60 mg/m². High-quality galvanized steel sheets from Baosteel have a sheet thickness of 1.2–1.5 mm and a zinc layer thickness of 80 mg/m². Differences in the thickness of galvanized steel sheets and zinc layers directly affect product appearance, service life, and oxidation resistance. Oxidation of the zinc layer will also severely impact product quality. 3 External circulating ducts: typically made of galvanized steel sheets from general steel mills, with sheet thickness of 1.0–1.2 mm and zinc layer thickness of 50–60 mg/m². High-quality galvanized steel sheets from Baosteel have a sheet thickness of 1.5–2.0 mm and a zinc layer thickness of 80 mg/m². Differences in the thickness of galvanized steel sheets and zinc layers directly affect product appearance, service life, and oxidation resistance. 4 Heating system: Italian or Taiwanese burners, self-made heat exchangers (or direct-fired type without heat exchanger), self-made hot-air filtration chambers, domestic filters. German or American burners, high-efficiency heat exchangers manufactured by professional vendors, equipped with fully imported control valve groups, professional-manufactured hot-air filtration chambers, and imported filters. The quality of burners and heat exchangers directly affects heat exchange efficiency, energy utilization rate, flue gas temperature, equipment safety during operation, equipment lifespan, maintenance rate, and overall production line efficiency, among other factors. 5 Hot-air circulating fans: generally high-temperature resistant, high-efficiency, low-noise premium fans (imported bearings); domestic and imported filters differ dramatically in filtration efficiency and precision. 6 Supply air filters: domestic filters vs. imported filters. 7 Exhaust air filters: none vs. imported filters. 8 Duct insulation: insulation thickness 50 mm, outer panel made of 0.5–0.6 mm color-coated steel; insulation thickness 100 mm, outer panel made of 1.0 mm galvanized steel. 9 Exhaust gas outlet: one set vs. two sets. Setting up two separate exhaust systems ensures that, in case of an emergency requiring furnace shutdown, hot air inside the furnace can be quickly expelled, thus avoiding unnecessary damage caused by over-drying of workpieces. 10 Control system: domestic components, domestically produced control cabinet; fully imported components, control cabinets produced by joint ventures. Control accuracy and reliability differ dramatically. 11 Material selection: general steel mills vs. high-quality steel from Baosteel. 12 Component selection: general manufacturers vs. joint ventures or well-known domestic enterprises. 13 Equipment machining accuracy: general vs. very good. 14 Overall reliability: general vs. very good.