Temperature monitoring of the pusher arm wall using thermal imaging
- Increase quality: High quality metallurgical coke effects iron and steel making process
- Coke Yield: Critical for good quality coke, as the temperatures in the oven and heating chambers in coke oven battery are controlled
- High Sensor Reliability (Uptime): The thermal camera in installed 5meters away
Challenges
Effectively maintaining temperature of the heating chambers in the coke oven battery is essential for high yield and optimum quality of the coke. The narrow width of the flue makes it challenging for the accurate measurement of the flue temperature using a portable pyrometer inside the pusher arm as the hot coke is pushed out of the oven.
Solution
In order to monitor the temperature of the coke oven walls as the hot coke gets pushed out of the oven, a thermal imaging camera was installed. The Pi450 from Optris, a highly compact IR camera, with a measurement speed of 80 Hz and an optical resolution of 382 x 288 pixels was installed 5 meters away from the pusher arm . The camera due to its thermal sensitivity of 40 mK, provided real-time thermographic images in high speed and successfully detected even the slightest temperature differences.
- High temperature range of 2000C -15000C
- Tolerant to dirty environment. The infrared camera was installed 5 meters away from the pusher arm
- Capable of withstanding high ambient temperatures with special air cooling housing available for ambient temperatures > 900C
- Multiple Output with 2-3 wall temperature points per camera (4-20mA output)
- Wide optic lens
- 3nos of 4-20mA output signal
- Data logging
- Alarm and alert
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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