Paint drying design and drying radiator selection
1. Overview of the program:
The paint drying scheme is a classic heating scheme that uses steam as a medium to transfer the heat in the high-temperature steam to the cold air, so that the cold air is rapidly heated to dry the paint. When baking paint, adjust the damper to the painted position, the hot air circulates, and the temperature in the baking room rises rapidly to the predetermined drying temperature (70 °C - 80 °C). After the fan filters the external fresh air, it is heat exchanged with the radiator and sent to the air chamber at the top of the paint booth. After a second filtration and purification, the hot air passes through the inner circulation of the damper, except for a small amount of fresh air. Most of the hot air is continuously heated and utilized, so that the temperature in the paint room is gradually increased to achieve the purpose of drying the paint.
2. Selection:
According to the site conditions:
Used for baking paint, steam is steam, steam pressure is 0.7Mpa;
The temperature of the drying room is required to reach 70 ° C - 80 ° C;Designed according to the size of the drying room and steam pressure:
The designed air volume is 4000 m3/h;
The calculated heat release is 88068 KCal/h; designed according to the above calculation; Two SRZ7*6D radiators are required, and the fan is equipped with a centrifugal fan of 4-72-5A.SRZ steel radiator is a frame fixed structure. It is made of Ф22×2mm seamless steel tube and is wound with 16×0.5mm corrugated steel strip. It is spiral, and the fork row is arranged with hot galvanizing. The structure is compact and airtight. Good, easy to install. Widely used in air heating systems for paint-drying radiators.
3. Scheme design:
According to our many years of design and production experience, with reference to "Thermal Properties of Saturated Water and Saturated Water Vapor", "Table of Physical Properties of Air" and related thermal theory, the design is as follows:
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project | data | unit | Remarks |
steam pressure | 0.7 | Mpa | |
Steam temperature | 170.444 | °C | |
Inlet density | 1.185 | Kg/m3 | Check the table (15 ° C dry air) |
Air volume | 4000 | M3/h | |
4740 | Kg/h | ||
1.32 | Kg/s | ||
Air weight flow rate Vr | 5.00 | Kg/m2•s | Assume |
Ventilation net cross-sectional area | 0.26 | M2 | |
Net face ratio | 0.61 | ||
Ventilation area | 0.43 | M2 | |
Heat transfer coefficient K | 25.44 | Kcal/m2*h*°C | |
Inlet air temperature | 15 | °C | |
Intake air specific heat capacity | 1.0112 | Kj/Kg•K | Check the table (15 ° C dry air) |
Air temperature | 90 | °C | |
Outer wind than heat capacity | 1.022 | Kj/Kg•K | Check the table (90 ° C dry air) |
Heat supply | 368478.1 | Kj/h | |
88068.38 | KCal/h | ||
Average temperature difference | 117.94 | °C | |
Total heat dissipation area | 29.35 | M2 | |
Long vent | 710.00 | Mm | 776 |
Vent width | 623 | Mm | 668 |
Actual ventilation area | 0.44 | M2 | |
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