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Technews Industry Guide - IIoT 2018

Technews Industry Guide - Maintenance, Reliability & Asset Optimisation

 

Infrared temperature sensing in steel processing applications
June 2018, Temperature Measurement


In the iron and steel industry, and in many foundry applications, temperature measurements show whether processes are operating within their proper ranges, whether a re-heater is too cold or too hot, whether a stand needs adjusting, or how much cooling should be applied. Each stage must be accurately monitored, so the steel retains the correct metallurgical properties as it travels through the process.

Every section of the steel manufacturing process can benefit from infrared thermometers and the customised applications developed by Fluke Process Instruments (formally Raytek and Ircon). These benefits include: higher quality products; increased productivity; reduced energy costs; enhanced worker safety; reduced downtime and easy data recording.

Increased functionality and greater control

Infrared sensors take temperature measurement one step further. Fast and accurate analog and digital output allows temperature data to be integrated into control systems and simultaneously output for remote temperature monitoring and analysis. Smart sensors, with digital electronics and 2-way communications, can be configured remotely from the safety of the control room, especially important for metals with changing emissivity. The result: increased functionality and greater control.

A wide range of optics covers an enormous variety of applications supported by integrated through-the-lens sighting, plus either laser or video sighting for correct target location. Infrared thermometers are used in many iron and steel applications including:

• Continuous casting: accurate real-time temperature monitoring coupled with the ability to adjust water nozzles and water flow rates allow for proper cooling, which helps maintain metallurgical properties. Fixed sensors, fibre optic sensors and line scanners are standard in this application.

• Reheating: reheating steel to a uniform temperature is critical so that deformation does not occur. Uneven heating strains milling equipment and increases maintenance downtime. Measuring inside a re-heater with a series of temperature measurement devices gives an operator the ability to check the overall temperature and burner efficiency, while being able to correct the process results in a more efficient use of fuel. Once the slab or billet exits the reheat furnace, ratio thermometers or line scanners (for wide slabs) transmit temperature data immediately to an operator or controller allowing mill operations to be adjusted to their correct settings.

• Rolling mills: the diversity in the types of hot rolling mills and the number of types of stands in a process vary according to the type of product being manufactured. Scale breakers, rolling stands, down coilers and coil boxes are a few areas for the utilisation of IR temperature measurement and scanning.

• Cold mills: coiling is also often done at the end of the finishing stands after cooling, and the coiled steel is transported to cold mills in another area in the plant or shipped to other facilities. Cold rolling makes a product thinner and smoother and is done while the steel is around 100°C, or at room temperature. Sensors mounted between each finishing stand allow the operator to detect temperature changes that require any adjustments.

Rod and wire mills

In a typical rod and/or wire mill, billets are reheated and sent to a rolling mill to be reshaped as rods. From here the rods go through a series of intermediate stands that reduce the rods to different sizes. Finishing stands reduce and smooth the rods into a product that can be further processed into hundreds of different products. Reheating a billet to a uniform temperature is critical to the entire process as uneven heating strains milling equipment and increases maintenance downtime.

Knowing the temperature of the product at each stand allows the operator to adjust the rollers accordingly. When the product heads for the cooling area, cooling is rapid but carefully monitored to make sure the metallurgical properties are correct. If cooling is improperly controlled, the product would not meet specifications and could be downgraded or scrapped.

In some processes, the high speeds and vibrations of narrow rod or wire products make temperature measurement difficult. High-performance infrared ratio thermometers solve this problem. Even when the target drifts in and out of the field of view, or is partially obscured, the Marathon sensor will still take accurate temperature measurements.

Other processes

Infrared provides temperature measurement solutions exist for every step in the steel treatment and manufacturing process, from coke ovens and blast furnaces to annealing mills and coating mills. In fact, wherever temperature is to be measured, from the raw material to the finished goods, there is probably an infrared, non-contact solution.

The fixed units and portables form Raytek and Ircon are well known industry standards. The scanners from both companies can come as complete applications packages with tried and tested software to fit perfectly into many industrial applications. Continual innovation and new products like the Endurance series, designed in conjunction with Raytek and Ircon, will ensure that solutions can be found for every application.

For more information contact R&C Instrumentation, 086 111 4217, info@randci.co.za, www.randci.co.za


Credit(s)
Supplied By: R&C Instrumentation
Tel: +27 32 946 2805
Fax: 086 622 6050
Email: info@randci.co.za
www: www.randci.co.za
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Further reading:

  • Safety temperature measurement device for boilers
    October 2018, GHM Messtechnik SA, Temperature Measurement
    The Safety-TL4896, a SIL2 rated temperature measuring device from Martens, conforms to international boiler regulations and offers a unique front panel installation. Certified to DIN EN14597 and DIN EN61508, ...
  • Raytek pyrometer sensor now in 4-20 mA
    October 2018, R&C Instrumentation, Temperature Measurement
    About a decade ago, Raytek introduced the CM, a compact, integrated IR non-contact thermometer intended for quick and seamless replacement of J and K-type thermocouples. The CM, still an industry favourite, ...
  • Temperature sensor with drift monitoring
    October 2018, ifm Electronic RSA, Temperature Measurement
    The sensors of ifm electronics’ TAD series have two resistance elements with different characteristics (PT and NTC) that monitor each other permanently in the process. Drift is immediately detected and ...
  • Resistance thermometer for harsh conditions
    September 2018, Instrotech, Temperature Measurement
    Due to their extreme insensitivity to vibration, impact and shock load, Kobold’s TNK resistance thermometers are particularly suitable for monitoring the temperature of diesel engines. The extremely robust ...
  • ThermoView for industrial thermal imaging applications
    September 2018, R&C Instrumentation, Temperature Measurement
    Fluke Process Instruments recently announced the ThermoView TV40, a high-performance industrial thermal imager designed for the most challenging environmental conditions. Supported by intuitive and powerful ...
  • Temperature transmitter with new HART protocol
    September 2018, WIKA Instruments, Temperature Measurement
    The T32.xS temperature transmitter from WIKA is now also available in a version that communicates via the new HART 7 protocol. Another new function is an extended measuring point description (Long Tag). ...
  • Smart pyrometers for factory ­automation
    August 2018, R&C Instrumentation, Temperature Measurement
    Fluke Process Instruments has launched the Thermalert 4.0 spot pyrometer series for automatic non-contact temperature monitoring between -40 and 2250°C. The series currently comprises 13 models with varied ...
  • New thermowell reduces fatigue failure
    August 2018, Emerson Automation Solutions, Temperature Measurement
    Emerson has released the Rosemount Twisted Square Thermowell line, a solution that reduces dynamic stress, simplifies process calculations and provides more accurate temperature measurements. This new ...
  • Non-contact temperature measurement
    August 2018, ifm Electronic RSA, Temperature Measurement
    The TW range of infrared temperature sensors from ifm electronic is designed for the precise temperature measurement of particularly hot objects, or objects which are difficult to access, e.g. in the ...
  • Battery powered digital ­temperature gauges
    July 2018, Instrotech, Temperature Measurement
    Kobold’s DTE series of digital temperature gauges offers a wide range of industrial and analytical possibilities for applications where high accuracy and clear indication is required, and where alarm ...
  • High reliability in temperature measurement
    July 2018, Siemens Digital Factory & Process Indust. & Drives, Temperature Measurement
    With Sitrans TH320/420 and TR320/420, Siemens introduces a new generation of reliable HART temperature transmitters for a wide range of sensor types, suitable for mounting in sensor head and rail mounting. ...
  • IR windows improve safety and ­reduce cost
    July 2018, R&C Instrumentation, IS & Ex
    Thermal imaging is a well-established and proven method of preventative maintenance for electrical equipment. But the process does not come without risk. Removing panels to gain access to switchgear for ...

 
 
         
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