SEARCH

Background

Blast furnace charge surface management is a key link to ensure uniform charge distribution, smooth gas flow and stable smelting process. Its core goal is to control the order of charge loading, charge angle and charge flow speed to form a reasonable charge surface shape (such as ring, spiral, etc.), thereby optimizing the gas distribution in the furnace and improving the iron ore reduction efficiency and pig iron quality.

Solution Description

HIRDA-BF blast furnace charge surface infrared thermal imaging online temperature detection and analysis system is a special system used to detect the temperature distribution of the charge surface in the blast furnace. The system consists of infrared thermal imaging core, high temperature resistant infrared thermal imaging lens, automatic retraction protection device, furnace installation kit, air filtration system and field equipment box, algorithm server and intelligent temperature measurement software.

The high-temperature resistant thermal infrared camera lens is installed in a retractable metal protective cover. The high-temperature resistant thermal imaging cameras lens is directly extended into the furnace through the retractable device. The infrared thermal imaging core stays outside the furnace to realize continuous real-time monitoring of the working status of the furnace.

The protective cover is cooled by compressed cooling air to make the infrared lens work at a more suitable temperature; at the same time, the lens is purged to prevent the dust in the furnace from adhering to the lens protection window; the system has a built-in high-temperature protection circuit. Once the cooling gas or cooling water circulation is abnormal, the lens will be retracted to prevent damage by the high temperature in the furnace.

Thermal heat camera has the characteristics of high temperature resistance, corrosion resistance and maintenance-free. It can display various complex working conditions inside the blast furnace in real time. When the camera probe purges compressed air normally, it is suitable for various positive pressure kilns.

Advantages

◆With all-weather passive infrared temperature measurement function, real-time display of the temperature distribution of the material surface in the furnace

◆Adopt self-developed temperature measurement and correction algorithm to achieve accurate temperature measurement

◆Fully sealed to ensure that blast furnace gas does not leak

◆Ultra-large viewing angle, diagonal viewing angle can reach 120°

◆Spiral air curtain design, no dust accumulation on the lens

◆Overall stainless steel material, corrosion and temperature resistance

◆Automatic exit protection device, exit fault indication

◆Pneumatic/electric transmission mechanism

◆High temperature resistant optical pinhole lens, with dust-proof high temperature lens

◆Automatic exit from the furnace in case of over-temperature, under-voltage, and power failure

◆Support onvif protocol, can be connected to mainstream NVR

◆Not dependent on the system platform, can directly log in to the ip on the web page to access images and configurations, can directly output alarm signals to PLC or alarm

Benefits brought

• 

  Real-time visualization of the temperature gradient of the charge surface: The charge surface temperature of a blast furnace is usually between 800-1200°C, and the temperature uniformity directly affects the efficiency of charge preheating and reduction reaction. Infrared thermal imaging can capture local overheating (e.g. >1300°C, which may be caused by gas deviation) or low temperature areas (e.g. <700°C, indicating charge accumulation) on the charge surface.

• 

  Assist in judging the gas distribution status in the furnace: The heat exchange when the gas passes through the material layer will form temperature characteristics on the material surface (such as higher temperatures at the edge where the gas is abundant). Thermal imaging data combined with gas composition (CO/CO₂ ratio) can optimize air supply parameters to avoid “edge development” or “center accumulation”.

• 

  Monitor the uniformity of material surface descent: The normal blast furnace material surface descent rate is about 0.5-1m/h. If the local descent is too slow (such as <0.3m/h), it may cause the charge to stick together. Thermal imaging can identify the "dead material column" on the material surface (the temperature is continuously 50-80℃ lower than the surrounding area) through temperature changes, and guide the foreman to adjust the air volume or distribution mode to prevent abnormal furnace conditions.