Product Introduction

A hot blast stove is equipment used to heat the blast air for blast furnaces, and it is an indispensable and crucial component of modern blast furnaces. Most modern blast furnaces adopt regenerative hot blast stoves. Their working principle is as follows: first, gas is burned, and the generated flue gas is used to heat the checker bricks in the regenerator; then, the cold air sent from the blower station is heated by passing through the red-hot checker bricks. By alternately switching the hot blast stoves between combustion and air supply modes, the blast furnace can continuously obtain high-temperature hot blast. The temperature of the hot blast stove's dome is vital data necessary for the safe and accurate operation of the hot blast stove.

Traditional Hot Blast Stove Temperature Detection: Traditional temperature detection for hot blast stoves relies on thermocouples, typically using assembled platinum-rhodium/platinum thermocouples or double platinum-rhodium thermocouples. It indirectly controls the hot blast temperature by measuring the temperature of the dome's insulation wall.

Limitations of Thermocouples in Harsh Environments: The refractory lining of hot blast stoves operates in extremely harsh conditions of high temperature and high pressure. Due to the environmental requirements of thermocouples and the limitations of their own structure, in scenarios with frequent temperature changes, large pressure fluctuations, and vibrations, thermocouples suffer from inaccurate temperature measurement and slow response. As a result, they cannot accurately reflect temperature changes inside the stove.

Short Service Life of Thermocouples: Thermocouples work in high-temperature zones (1200℃～1300℃) for a long time, and the ambient temperature around the thermocouple junction box can also reach as high as 100～120℃. This leads to an extremely short service life of thermocouples, ranging from a few weeks to several months, increasing both operating costs and maintenance workload.

Solution: Infrared Temperature Measurement System for Hot Blast Stove Domes: To overcome the above shortcomings, our company has designed and produced an infrared temperature measurement system for hot blast stove domes, which effectively addresses the aforementioned issues and ensures reliable operation of the infrared temperature measurement system in complex environments.

Targeting the application scenarios of hot blast stoves in the metallurgical industry, our company has developed a two-color infrared thermometer suitable for such environments. It is configured with a sealed isolation window and a dedicated protection device. The main unit adopts a flange connection (customizable according to user requirements), allowing for easy installation on the dome.

The infrared thermometer determines the temperature of the hot blast by measuring the temperature of the checker bricks. It outputs a 4-20 mA current signal corresponding to the measured temperature, which is then sent to a computer or recorder for processing. The two-color infrared thermometer can reduce the impact of factors such as varying emissivity, dust, moisture, and fog at the measurement site, changes in distance, and partial obstruction of the measured object on the temperature measurement result. This enhances the reliability of the system and reduces the user's maintenance workload.

Technical Parameters

Temperature Measurement Range: 600℃～1600℃

Detector: Si/Si (stacked silicon)

Operating Wavelength:

Wavelength 1: (0.7～1.08) μm

Wavelength 2: 1.08 μm

Main Applications: Hot blast stoves, hot rolling, wire and bar production, metal forging, casting, induction heating, molten glass, cement kilns, semiconductors

Distance Coefficient: 60:1

Measurement Distance: Adjustable from 0.35m to infinity

Measurement Accuracy: ±0.5% tm ℃ (tm refers to the upper limit of the temperature measurement range)

Resolution: 0.1℃

Repeatability: ±2℃

Two-Color Coefficient: 0.850～1.150, adjustable in steps of 0.001

Response Time: Up to 10ms, adjustable

Analog Output: 12-bit 4mA～20mA

Alarm Output: Upper limit and lower limit alarm outputs

RS485 Output: Enables parameter modification, data recording, and query functions

Power Supply: DC24V, with overvoltage, overcurrent, and short-circuit protection; Power Consumption: 5W (24V@200mA)

Warm-Up Time: Equipped with a built-in constant-temperature heater; temperature measurement becomes available 10 minutes after power-on

Aiming Method: Eyepiece aiming

Interface: Adopts a binder sealed plug and a 12-core high-temperature shielded cable (length: 2.5m)

Operating Temperature (Without Water Cooling): -30℃～+55℃; Purge Pressure: 0.1MPa; Purge Flow Rate: 6L/min

Operating Temperature (With Water Cooling): -30℃～+120℃; Cooling Water Pressure: 0.2MPa; Cooling Water Flow Rate: 2L/min

Protection Class: IP65