Melting and refining furnace for cold iron source and method of operating melting and refining furnace

Patent metadata

Field	Value
Publication number	US-11053559-B2
Application number	US-201716083993-A
Country	US
Kind code	B2
Filing date	Mar 1, 2017
Priority date	Mar 31, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

One object of the present invention is to improve efficiency at the time of operation of a melting and refining furnace of a cold iron source using an oxygen burner lance, and the present invention provides a melting and refining furnace comprising a through-hole provided through a furnace wall, one or more oxygen burner lances provided in the through-hole: and a thermometer which is configured to measure a temperature in the furnace, the oxygen burner lance has one or more openings communicating with the inside of the furnace, and the thermometer is provided in any one of the openings.

First claim

The invention claimed is:

1. A melting and refining furnace comprising an oxygen burner lance which is configured to eject a combustion-supporting fluid containing oxygen and a fuel fluid toward a cold iron source in the furnace,
wherein the melting and refining furnace further comprises:
a through-hole provided through a furnace wall;
one or more oxygen burner lances provided in the through-hole; and
a thermometer which is configured to measure a temperature in the furnace,
the oxygen burner lance has one or more openings communicating with the inside of the furnace, and the thermometer is provided in any one of the openings,
wherein one or more combustion-supporting fluid supply holes which are configured to supply a combustion-supporting fluid containing oxygen for secondary combustion into the furnace is provided through the furnace wall above the through-hole, and
wherein one or more carbon source supply holes which are configured to supply a carbon source into the furnace is provided through the furnace wall below the through-hole.

2. The melting and refining furnace according to claim 1 , wherein the melting and refining furnace further comprises:
an exhaust gas discharge path which is configured to discharge an exhaust gas from the furnace; and
an exhaust gas analyzer which is configured to measure at least one of a concentration of components contained in the exhaust gas and a flow rate of the exhaust gas.

3. The melting and refining furnace according to claim 2 , wherein the melting and refining furnace further comprises:
a control device which is configured to receive a measured value of a furnace temperature from the thermometer and the measured value of the at least one of a component concentration and a flow rate from the exhaust gas analyzer, analyze the measured values, and transmit a control signal for controlling a supply amount of the combustion-supporting fluid, the fuel fluid, and the carbon source which are supplied into the furnace.

4. A method of operating a melting and refining furnace according to claim 1 , wherein the method comprises:
measuring a temperature in the furnace by a thermometer provided in the oxygen burner lance; and
controlling a supply amount of the combustion-supporting fluid and the fuel fluid to be supplied into the furnace based on a measured value of the temperature in the furnace.

5. A method of operating a melting and refining furnace according to claim 1 , wherein the method comprises:
measuring a temperature in the furnace by a thermometer provided in the oxygen burner lance;
measuring a concentration of a component contained in an exhaust gas discharged from the furnace and a flow rate of the exhaust gas; and
controlling a supply amount of the combustion-supporting fluid, the fuel fluid, and a carbon source which are supplied into the furnace based on the temperature in the furnace, the concentration of the component, and the flow rate of the exhaust gas.

6. The melting and refining furnace according to claim 1 , wherein the melting and refining furnace further comprises:
an exhaust gas discharge path which is configured to discharge an exhaust gas from the furnace; and
an exhaust gas analyzer which is configured to measure at least one of a concentration of components contained in the exhaust gas and a flow rate of the exhaust gas.

7. The melting and refining furnace according to claim 1 , wherein the melting and refining furnace further comprises:
an exhaust gas discharge path which is configured to discharge an exhaust gas from the furnace; and
an exhaust gas analyzer which is configured to measure at least one of a concentration of components contained in the exhaust gas and a flow rate of the exhaust gas.

Assignees

• Taiyo Nippon Sanso Corp

Inventors

• Hagihara Yoshiyuki
• Yamamoto Yasuyuki
• SEINO Naoki

Classifications

• G01J5/48

  Thermography; Techniques using wholly visual means · CPC title

• F27D2019/0015

  Monitoring the composition of the exhaust gases or of one of its components · CPC title

• G01J5/60

  using determination of colour temperature · CPC title

• G01J5/004

  by molten metals · CPC title

• F23D14/22

  with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other · CPC title