Have Questions?
Contact a Yokogawa Expert to learn how we can help you solve your challenges.
![]() |
Hot Blast Stove Process |
Measurement of O2 Concentration in Hot Blast Stoves Essential to Improving Combustion Efficiency
In a hot blast stove, the by-product gas produced in a coke oven is burned to preheat the air blast for the blast furnace. To improve the combustion efficiency and conserve energy in a hot blast stove, it is essential to be able to control combustion by measuring and adjusting the oxygen concentration in the exhaust gases.
The ZR22/ZR402 Direct In-Situ Zirconia Oxygen Analyzer is ideally suited for combustion control in hot blast stoves. It utilizes a long life sensor.
Expected Benefits
The temperature of the hot blast used in blast furnaces has been increasing every year and currently stands at around 1300°C. Under such circumstances efficient operation is achieved by such measures as increasing the calorie value of fuel gas, replacing the hot blast stoves more frequently, and recovering waste heat from gas. To further improve combustion efficiency and save energy, measurement of the oxygen concentration in exhaust gases is required.
Field Data
Process Conditions
Measurement point: | duct |
---|---|
Temperature: | 20 to 350°C |
Pressure: | 3.5 to 10 kPa |
Dust: | 50 mg/Nm3 |
Fuel: | Gas |
Measurement System
Detector: | ZR22G-015-S-Q-E-☐-☐-E-A/CV/Z |
---|---|
Z: | Glove box option |
Converter: | ZR402G-☐-E-E-A |
Flow setting unit: | ZA8F-☐*C |
Calibration gas unit
Pressure regulator for gas cylinder: | P/N G7013XF (inlet W22, outlet Rc1/4) or |
---|---|
P/N G7014XF (inlet W22, outlet 1/4NPT) | |
Case assembly for calibration gas cylinder: | P/N E7044KF |
Note: the calibration gas cylinder must be purchased locally
Utilities
Power supply: 85 to 264 V AC, 50/60 Hz
Instrument air (reference gas): pressure, 300 to 700 kPa
Notes
The AV550G multi channel oxygen analyzer system allows for measurements on up to 8 ZR22 probes simultaneously.The ZR probe's in-situ measurement method does not require any process conditioning or extractive sampling. This reduces maintenance costs and allows faster measurement response to changes in the process.
The ZR probe's in-situ measurement method does not require any process conditioning or extractive sampling. This reduces maintenance costs and allows faster measurement response to changes in the process.
Oxygen analyzers provide valuable measurements in combustion control, process quality, safety and environmental applications.
Contact a Yokogawa Expert to learn how we can help you solve your challenges.