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How to detect the lining thickness of a high-temperature electric furnace?

How to detect the lining thickness of a yüksek sıcaklıklı elektrikli fırın?

1. Kapasitans yöntemi

Kapasitans yöntemi, direnç yöntemine benzer. Fırın astarının içine bir koaksiyel dairesel kapasitör sensörü yerleştirilmiştir ve kapasitans değeri, uzunluğuna karşılık gelir. Yüksek fırın duvar kalınlığı, kapasitans değeri ölçülerek belirlenebilir.

2. Stress wave method

The stress wave signal is very sensitive to structural defects. When the stress wave propagates in the medium, such as holes, cracks and other interface discontinuities, reflection, refraction, scattering and mode conversion will occur. The thickness of the stave material can be determined.

3. Direnç yöntemi

The resistance element is embedded inside the furnace lining, the front of the sensor is aligned with the inner surface of the furnace lining, and it is connected to the measurement system through a lead wire. The resistance value of the resistance element is related to its length. As the resistance element and the furnace lining lose synchronously, the resistance will change. Use the corresponding measurement The meter measures the electrical signal output by the component, and then the remaining thickness of the furnace lining can be measured online.

4. Isı akışı algılama yöntemi

Termodinamiğe göre sıcaklık farkı, ısıl iletkenlik ve fırın duvar kalınlığı ısı akış yoğunluğunu belirler. Yüksek fırın astarı için, termal iletkenlik sabittir ve fırın duvar kalınlığı, sıcaklık farkı ve ısı akış yoğunluğundan elde edilebilir.

The heat flow detection sensor is installed in the lower temperature part of the furnace lining. The heat flow intensity is calculated by the water temperature difference of the cooling wall of the hearth, and the temperature value measured by the thermocouple in the brick lining is combined to calculate the thickness of the furnace wall.

5. Ultrasonik yöntem

The thickness measurement is carried out at the point where the ultrasound propagates in the solid medium. At a constant temperature, the ultrasound is incident on the furnace lining and enters the furnace. The propagation time of the incident and reflection of the ultrasound in the furnace lining is used to obtain the residual thickness of the furnace lining.

6. Çok kafalı termokupl yöntemi

Several thermocouples of different lengths are installed in a protective sleeve, and then they are installed in the brick lining that needs to be inspected, and the erosion of the masonry can be inferred by measuring the temperature change of each thermocouple. When the temperature of each point and the temperature gradient between each point are basically stable, when the brick lining is gradually eroded to a certain part, the galvanic couple in that part will be destroyed, and the temperature signal will be abnormal.

7. Model çıkarım yöntemi

Tespit elemanları olarak termokuplları kullanır, termodinamik ve diğer teorileri kullanarak ocak ve fırın alt sıcaklık bölgesinin matematiksel bir modelini oluşturur ve yazılım programlama ve sayısal analiz yoluyla erimiş demir katılaşma hattının ve karbon tuğla erozyon hattının yaklaşık konumlarını hesaplar.