Focus on serving Metal, Mining and Crane Segment.
Focus on serving Metal, Mining and Crane Segment.
Temperature monitoring to ensure uniform heating of sinter bed
A non-contact thermal imaging camera was used to monitor the temperature profile of the sinter cake and ensure uniform heating. Hot spots could be detected in time and avoid damage to conveyor and subsequent downtime was avoided. |
Pilger mill in tube rolling mills - hot and cold pipe detection
- Increased efficiency: Precise control of burner section to ensure uniform heating
- Improved safety level: Hot spot detection to avoid damage to conveyor and subsequent downtime
- Process visualization: Monitoring sinter caking on a PC
Challenges
The sintered material of desired chemical composition and grain size is charged into the Blast furnace. Iron ore fines, limestone, waste, scale and slag particles and dolomites are mixed together. As the mixture is baked and the sinter cake moves on the conveyor, it becomes critical to ensure that the sinter is homogenous through the cake. Proper sintering removes unwanted Sulphur and makes down-stream processes efficient in the blast furnace.
Solution
In order to ensure uniform heating and to monitor the temperature profile of the sinter cake, a non-contact thermal imaging camera was used. The robust and compact design made it ideal for this application.
System features included
- Temperature Range: 150⁰C – 1500⁰C
- Wide optic lens. 4-20mA output signal
- Data logging feature
- Alarm and alert function
- Rugged outdoor housing: for installing the camera for high ambient temperature environment
- 80 Hz frame rate for the monitoring of fast thermal processes
- Optical resolution of 382 x 288 pixels
Products and Accessories
Case Study Number
- TP3
Challenge
- The increasing flexibility of production lines requires a high adaptability of sensors. Continually changing object geometries, different temperatures and very high radiation or surrounding temperatures are no rarity.
- In a pilger mill those rough conditions can be found, among others in the production of seemless steel pipes. The raw steel blocks, each weighing a few tons are heated up first in a round oven at a temperature of 1300 °C.
- After descaling of the surface, the steel block is prepunched in a hole press with a strength from a converted 2000 t. In the next sloping rolling mill the growing pipe rotates between two rollers that are positioned at an angle to each other. The punching is widened to the size of the mandrel diameter.
Previous solution / Competitor product
- N/A
Solution
- The sensor that was installed at this application is the HMD OKA 2038.38 G with tube OL 19.
- The signal of the infrared sensors controls the movement of centering device and abutment. The point of view is restricted by the tube and prevents disturbances by steam in the cooling phase.
- An optimum adaptation to the operating conditions is given due to the adjustable response temperature. The HMD with self-learning response temperature (Auto-Teach function) is suited to continually changing conditions.
- The compact sensor with a stainless steel housing can withstand surrounding temperatures of up to 75° C. The use of a cooling jacket raises this up to 200° C.
- Alternatively sensors with fibre optic cables are available which permit an application at ambient temperatures up to 600° C without cooling.
Customer Benefits
- Maintenance-free
- High temperature stability
- Recognition of hot objects at big distances
- Self adjustment with Auto-Teach or step switch for the response temperature
Product Part number
- OKA 2038.38 G
Brand
- Proxitron
Accessories
- Piros swivel stand HM2
- Tube OL 19
- Pilot light unit (for alignment) DAK 308 + OL 26
- Different cable lengths (e.g. 15 m)
Customer Testimonial
compared to previous solution or competition
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