CO Measurement of PCI in Steel Plant

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

Measurement System

• • ^*1) depends on flange size
    ^*2) option code(if needed)
    ^*3) depends on cable length
    ^*4) depends on the application

• 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.