Introduction
A furnace for heating slabs needs to be operated under low oxygen conditions at high temperatures of 1000℃ and above to prevent oxidation of the steel. The measurement of oxygen concentrations in the furnace is essential in this process.
The ZR22G/ZR802G Zirconia Oxygen Analyzer requires no sampling system and utilizes a long-life sensor, and is therefore ideally suited for measurement of oxygen concentrations in a hightemperature environment. The ZR22G detector with the ZO21P high temperature probe adapter can be used in gas furnaces at temperatures up to 1400℃.
Expected Benefits
- Maintains high product quality by monitoring oxygen concentrations in steel mill reheating furnaces
- Ensures stable, continuous measurement of oxygen concentrations
- Reduces operating costs
Process Overview
Slabs are loaded on a conveyor and fed to a reheating furnace, which is heated to between 900 and 1400℃ by burners that use fuels such as by-product gas. In order to keep the oxygen concentration between 1 and 2%, it is monitored in the preheat, heat , and soak zones. The slabs are heated uniformly without being oxidized, and then sent to the next processing stage.
Solution Details
Field Data
| Process conditions | |
|---|---|
| Measurement point: | furnace reheat, heat, and soak zones |
| Temperature: | 900°C to 1400°C |
| Pressure: | 30 to 50 kPa |
| Dust: | Trace |
| Fuel: | Gas |
Measurement system
| Detector: | ZR22G-015-S-Q-☐-☐-☐-E-A/CV |
|---|---|
| High temperature probe adapter: | ZO21P-H-☐-☐☐☐-☐*B |
| Auxiliary ejector for high temperature use: | E7046E☐ |
| Converter: | ZR802G-☐-☐-N-N/☐ |
| Flow setting unit: | ZA8F-☐*C |
| Calibration gas unit | |
| Pressure regulator for gas cylinder: | G7013XF (inlet W22, outlet Rc1/4) or G7014XF (inlet W22, outlet 1/4NPT) |
| Case assembly for calibration gas cylinder: | E7044KF |
Note: the calibration gas cylinder must be purchased locally.
Probe Adapter
| Utilities | |
|---|---|
| Power supply: | 85 to 264 V AC, 50/60 Hz |
| Instrument air (reference gas): | pressure, 300 to 700 kPa |
Notes
The material selected for the high temperature probe adapter depends on the temperature of the sample gas. Follow instructions carefully when installing the probe.
| SUS: | Sample gas temperature ≤ 750°C |
|---|---|
| Probe orientation: | vertical or horizontal |
| Inconel: | 750°C < sample gas temperature ≤ 900°C Probe orientation: vertical or horizontal |
| SiC: | 900°C < sample gas temperature ≤ 1400°C Probe orientation: vertical |
Note:
When the probe is installed horizontally, bracings must be provided for mechanical support
Industries
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Iron & Steel
- Iron and steel industry
- Improve quality of products, manufacturing, and operation technologies
- Address environmental and energy-efficiency issues
- Create the ideal plant and evolve for mutual growth
Related Products & Solutions
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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. -
Oxygen Analyzers
Oxygen analyzers provide valuable measurements in combustion control, process quality, safety and environmental applications.
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