Introduction
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| 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 ZR22G/ZR802G Direct In-Situ Zirconia Oxygen Analyzer is ideally suited for combustion control in hot blast stoves. It utilizes a long-life sensor.
Expected Benefits
- Improves combustion efficiency in hot blast stoves
- Ensures stable, continuous oxygen measurement
- Reduces operating costs
- Minimizes the need for equipment replacement
Process Overview
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 furnace 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.
Solution Details
Field Data
Process Conditions
| Measurement: | 20 to 350 ℃ |
|---|---|
| Pressure point: | Duct |
| Temperature: | 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: | ZR802G-☐-☐-N-N /☐ |
| Flow setting unit: | ZA8F-☐*C |
| Pressure regulator: | G7013XF or G7014XF |
| Case for calibration gas cylinder: | E7044KF |
Note: the calibration gas cylinder must be purchased locally
Utilities
Rated voltage: 100 to 240 V AC
Rated frequency: 50/60 Hz
Power consumption: 330 VA (Max. 800 VA)
Instrument air (reference gas) pressure: 300 to 700 kPa
Notes
- The detector is installed in a glove box to reduce the sample gas pressure.
- When more than three detectors are installed, it is recommended that the AV550G Averaging Converter be used instead of the ZR802G converter. The AV550G accepts signals from up to eight detectors.
Related Industries
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Iron & Steel
In the iron and steel industry, it is crucial to improve the quality of not only products but also manufacturing and operation technologies, as well as to address environmental and energy-efficiency issues. Yokogawa helps customers to create the ideal plant and evolves with them for mutual growth.
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Oxygen Analyzers
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Zirconia Oxygen/Humidity Analyzer ZR22G, ZR802G
This Oxygen concentration and humidity at high temperatures consists of a ZR22G detector equipped with a long-life and highly reliable zirconia sensor, and a converter ZR802G equipped with digital communication and data log functions.
ZR22G and ZR802G can be measured directly and continuously without a sampling device. It is easy to maintain and reduce operating costs by self-diagnosis of sensor deterioration (without using calibration gas )and replacing the heater assembly on site.