Prevent Self-ignition of Pulverized Coal with a Fast Measurement Time of Less than 2 Seconds
Outline
Pulverized coal piled up in bag filters (dust collectors) can cause self-ignition in pulverized coal injection (PCI) facilities at steel plants, and that is a safety concern. It can prevent ignition by measuring and monitoring carbon monoxide (CO) concentration continuously. An upward trend in CO is a sign of self-ignition. However, the conventional method is not suitable for CO measurement, because it requires a sample conditioning system (SCS) before measurement, resulting in response delays and increased maintenance costs and man-hours. The TDLS8000 laser gas analyzer can solve this problem efficiently. It can be installed directly in the process without a SCS, resulting in fast measurement and a significant reduction in running costs.
Customer’s Expectation
- Safe operation of PCI facilities (prevention of self-ignition)
- Early detection of pulverized coal self-ignition
- CO concentration meter with fast response and continuous measurement
- Reduction of SCS maintenance costs and man-hours
Process Overview
Pulverized coal is provided to the blast furnace. A bag filter is set to remove pulverized coal in the exhaust line of the storage tank. Piled-up pulverized coal can self-ignite in a high-temperature environment. Temperature and CO concentration are measured to prevent ignition.
Solution Provided by Yokogawa
TDLS8000 can detect CO concentration quickly by in-situ measurement. That means catching the signs of self-ignition in pulverized coal piled up in bag filters and taking the necessary action immediately. Also, TDLS needs only slight maintenance due to non-sampling and non-consumption parts.
Advantages of TDLS8000
- Fast response - direct measurement of process gas
- Slight maintenance - non-sampling
- Accurate measurement of low concentration - reference cell installation
Measurement System
- Model & Suffix Code
- TDLS8000-G2-C2-□*1)- A1-J-N/RC/＊*2)
- Unit connection cable：K9775□*3)
- Utility
- Recommended purge gasses*4)；
N2（more than 99.99%）or instrument air - Purge gas flow rates*4)；
Optic： 2～20 L/min
Process gas window(one side)：typ. 5～50 L/min *4) - Power supply；24 V DC ± 10%
- Recommended purge gasses*4)；
-
- *1) depends on flange size
*2) option code(if needed)
*3) depends on cable length
*4) depends on the application
- *1) depends on flange size
- Note
- Please use clean and dry purge gas.
- Please select -C2 instead of -C1 for TDLS gas code.
- Please check the CO2 and H2O concentration in the process gas and write them on the application datasheet.
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.
Related Products & Solutions
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In-Situ Gas Analyzer TDLS8000
Yokogawa’s new TDLS™8000 houses all of the industry’s leading features in one robust device. The platform design is for in situ measurements which negate the need for sample extraction and conditioning.