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. Successfully monitoring the temperature of the heating chambers also reduces risk of damage to the oven wall.
Temperature monitoring of the pusher arm wall
Pilger mill in tube rolling mills - hot and cold pipe detection
- Fibre optic based pyrometer installed inside the pusher arm to measure the temperature of coke oven walls profile as the hot coke is pushed out. Typically six numbers are fitted to pusher arm (three each side).
Increased quality: High quality metallurgical coke results in improved iron and steel making process
Better coke yield: Critical for good quality coke, the oven and heating chambers in coke oven battery are effectively controlled
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.
- Successfully monitoring the temperature of the heating chambers also reduces risk of damage to the oven wall.
Solution
- Fibre optic-based pyrometer was installed inside the pusher arm to measure the profile temperature of coke oven walls as the hot coke is pushed out of the oven.
The 2-color ratio technology allows accurate and repeatable temperature measurements free from dependence on absolute radiated energy values. 2-color sensors measure closer to the highest temperature within the measured spot (spatial peak picking) instead of an average temperature.
Due to its short measuring wavelength the ratio pyrometer was used.
- Given the harsh operating environment the pyrometer is resistant to dust, steam and dirt and gives accurate measurements even in cases of window soiling of up to 90 percent.
- Rugged and electrically isolated sensing head
- Long length of fibre optic cable (3|6|10|15|22 meters available)
- Small sensor head dimensions M40 makes it ideal for hard to access areas
- Temperature range of 500⁰C -1800⁰C
- Tolerant to dirty environment as 5% FOV coverage is sufficient for accurate measurement
- Pyrometer could withstand high ambient temperature of 315⁰C for optic head with fibre optic cable
- The short response time was ideal for the monitoring of very fast processes
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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