Fast Medium Wave Infrared Heating Solution for Electrostatic Powder Coating Curing Oven

Aug 11,2026

Fast Medium-Wave Infrared Heating Solution for Electrostatic Powder Coating Curing Oven

Designed by: Nanjing E-DEN Lighting Technology Co., Ltd.
Date: August 2026

1. Design Background and Basic Parameters

This project designs a matching infrared heating solution for electrostatic powder coating curing oven, using fast medium-wave infrared heating lamps to radiatively heat cold-rolled steel sheet workpieces, thereby achieving rapid curing of powder coatings. The basic oven parameters are as follows:

Item	Parameter
Oven internal dimensions	Length 20,000 mm × Height 2,700 mm × Depth 800 mm
Workpiece material	Cold-rolled steel sheet
Workpiece thickness	0.5 mm
Maximum workpiece size	1,750 mm (height) × 900 mm (width)
Curing temperature range	70 °C ~ 195 °C
Maximum conveying speed	2.5 m/min
Conveying method	Vertical suspension, continuous pass-through
Heating elements	Fast medium-wave infrared quartz lamps, 1 kW / 220 V each, length 800 mm
Power supply	Three-phase 380 V AC, star (wye) connection

2. Overall Design Scheme

2.1 Total Number of Lamps and Power

Total lamps: Approx.150 pieces (75 on each side)
Total installed power: 150 kW
Single lamp rating: 1 kW / 220 V / 800 mm length

2.2 Temperature Zone Division

To match the powder curing profile (preheat → curing → temperature keeping), the oven is divided along its length into three independent temperature‑controlled zones:

Zone Name	Function	Total Lamps (both sides)	Lamps per Side	Groups per Side (5 lamps/group)
Pre-heat zone	Rapid heating of cold sheets to near curing temperature	60 pcs	30 pcs	6 groups
Curing zone	Maintaining peak temperature for cross‑linking reaction	60 pcs	30 pcs	6 groups
Temperature keeping zone	Supplementary heating at the tail to compensate for outlet heat loss	30 pcs	15 pcs	3 groups
Total	—	150 pcs	75 pcs	15 groups

Each of the three zones is equipped with an independent SCR power regulator and PID temperature controller for precise zone‑by‑zone control.

3. Front Elevation View (Vertical Staggered Arrangement)

On each side, each group consists of 5 horizontally mounted lamps (lamp axes along the oven length). Adjacent groups are vertically offset by 200 mm to create an interleaved and complementary radiation field.

Arrangement parameters:

Vertical centre‑to‑centre distance within a group:400 mm
Offset between adjacent groups:200 mm(half the pitch)
Y‑axis positions for Group 1 (reference): 200, 600, 1000, 1400, 1800 (mm)
Y‑axis positions for Group 2 (offset): 400, 800, 1200, 1600, 2000 (mm)
Combined effective uniform radiation coverage:200 mm ~ 1800 mm(span 1600 mm)
Maximum workpiece height 1750 mm, fully enclosed within the effective coverage zone.

Design advantage:The staggered arrangement yields an equivalent dense radiation grid with a 200 mm pitch. No height interval within 200–1800 mm has a radiation gap exceeding 200 mm. The 0.5 mm thin steel sheet receives alternating pulsed radiation on both surfaces as it passes, promoting rapid heat diffusion and uniform surface temperature.

4. Electrical Wiring Scheme

4.1 Supply Configuration

Power supply: Three‑phase 380 V AC
Connection:Star (wye) connection, neutral point grounded
Each lamp is rated at 220 V and is connected between a phase line and neutral, perfectly matching the rated voltage.

4.2 Three-phase Balancing Strategy (Overall Coordination)

Each group contains 5 lamps. Simply cycling L1, L2, L3 would cause phase unbalance. Therefore, balancing must be performed at thezone level:

Zone	Lamps per Side	Allocated to L1	Allocated to L2	Allocated to L3	Balance Check
Pre‑heat	30 pcs	10 pcs	10 pcs	10 pcs	✅ Fully balanced
Curing	30 pcs	10 pcs	10 pcs	10 pcs	✅ Fully balanced
Temperature keeping	15 pcs	5 pcs	5 pcs	5 pcs	✅ Fully balanced
Total per side	75 pcs	25 pcs	25 pcs	25 pcs	✅ Perfect balance
Both sides	150 pcs	50 pcs	50 pcs	50 pcs	✅ Perfect balance

Maximum phase imbalance = 0%, far better than the national standard allowance, with no neutral point drift risk.

5. Summary of Key Parameters

No.	Parameter	Value
1	Oven internal dimensions	20,000 × 2,700 × 800 mm
2	Maximum workpiece size	1,750 × 900 mm
3	Workpiece thickness	0.5 mm
4	Curing temperature	70~195 °C
5	Maximum conveying speed	2.5 m/min
6	Lamp type	Fast medium‑wave infrared quartz
7	Single lamp power/voltage	1 kW / 220 V
8	Single lamp length	800 mm
9	Total number of lamps	150 (75 each side)
10	Total installed power	150 kW
11	Power supply	380 V 3‑phase, star connection
12	Phase balance	Perfect (50 lamps per phase)
13	Lamp‑to‑sheet distance	180 mm
14	Lamps per group	5 (vertical pitch 400 mm)
15	Adjacent group offset	200 mm (half pitch)
16	Effective radiation coverage height	200~1800 mm
17	Pre‑heat zone group pitch	1.2 m (6 groups)
18	Curing zone group pitch	1.3 m (6 groups)
19	Temperature keeping zone group pitch	1.4 m (3 groups)
20	Total effective span	18.0 m
21	Total incoming current	≈228 A
22	Main circuit breaker rating	300 A / 3P

This design scheme, tailored for curing electrostatic powder coatings on 0.5 mm cold‑rolled thin steel sheets, employs a 150 kW fast medium‑wave infrared heating system. Through engineering measures such as three‑zone independent temperature control, bilateral opposing staggered vertical arrangement, and perfect three‑phase power balancing, it achieves:

Thermal uniformity:An equivalent 200‑mm dense radiation grid in the vertical direction, effectively covering the height range of 200~1800 mm, fully enveloping the maximum 1750‑mm workpiece without striping defects.
Power matching:The 150 kW total power satisfies the 195 °C curing requirement with sufficient margin for cold starts and irregular‑shaped workpieces.
Electrical safety:Perfect three‑phase load balance eliminates neutral point drift; independent SCR control for each zone provides flexibility and reliability.
Process adaptability:The progressively increasing group pitches 1.2/1.3/1.4M along the length match the heating → holding → Temperature keeping curing profile; speed feed‑forward control ensures temperature stability under varying throughput.