Direct reduction shaft furnace with probe for measuring interior gas analysis

Patent metadata

Field	Value
Publication number	US-2021396469-A1
Application number	US-201817292512-A
Country	US
Kind code	A1
Filing date	Nov 13, 2018
Priority date	Nov 13, 2018
Publication date	Dec 23, 2021
Grant date	—

Abstract

A direct reduction shaft furnace having at least one probe disposed vertically within the reduction zone thereof. The probe preferably extends from the top to the bottom of the reduction zone. The probe allows for gas sampling along the length thereof and transmittal of the gas to at least one type of gas analysis device. The probe may also allow for the measurement of the temperature and pressure of the gas sample as it is taken.

First claim

What is claimed is:

1 - 15 . (canceled)

16 . An apparatus for the direct reduction of metal ore, the apparatus comprising:
a vertical shaft furnace, the shaft furnace having a metal ore reducing zone; at least one probe for sampling gas from within the reduction zone of said vertical shaft furnace; the at least one probe being disposed vertically within the reduction zone and extending through the entire reduction zone; the probe comprising a plurality of sampling pipes, each sampling pipe having an upper portion and an end portion, the sampling pipes being disposed within at least one support pipe.

17 . The apparatus as recited in claim 16 wherein the support pipe encases and supports a portion of the upper portion of all of the sampling pipes.

18 . The apparatus as recited in claim 17 wherein the end portion of each of the sampling pipes is configured to allow for intake of a gas sample therethrough.

19 . The apparatus as recited in claim 18 wherein the end portion of each of the sampling pipes further includes a thermocouple to measure a temperature of the gas sample.

20 . The apparatus of claim 19 wherein the sampling pipes are each of different length and extend down through the reduction zone different distances so as to allow for intake of samples from different depths in said reduction zone.

21 . The apparatus as recited in claim 17 wherein each of said sampling pipes:
are the same length as a rest of the sampling pipes;
has a gas intake port disposed through the wall thereof at a different position along a length thereof than the rest of the sampling pipes, the gas intake port configured to allow for intake of a gas sample therethrough;
has the end portion thereof closed off to prevent gas from entering therethrough.

22 . The apparatus as recited in claim 21 wherein each of the sampling pipes further includes a thermocouple disposed adjacent the gas intake port to measure a temperature of the gas sample.

23 . The apparatus as recited in claim 22 wherein:
a first of the sampling pipes is concentrically nested within the support pipe, the first sampling pipe being longer than and having an end portion protruding from the support pipe;
each subsequent one of the sampling pipes being concentrically nested within a previous of the sampling pipes and being longer than the previous sampling pipe so as to have an end portion protruding from the previous sampling pipe.

24 . The apparatus as recited in claim 23 wherein the end portion of each of said sampling tubes is configured to allow for intake of a gas sample therethrough.

25 . The apparatus as recited in claim 24 wherein the end portion of each of the sampling pipes includes a thermocouple disposed therein to measure a temperature of the gas sample.

26 . The apparatus as recited in claim 15 further comprising a gas analysis system.

27 . The apparatus as recited in claim 26 wherein the gas analysis system includes a gas cooling system to cool the gas sample before compositional analysis.

28 . The apparatus as recited in claim 27 wherein the gas analysis system further includes a gas compositional analyzer.

29 . The apparatus as recited in claim 28 wherein said gas compositional analyzer includes a mass spectrometer.

30 . The apparatus as recited in claim 28 wherein the gas analysis system further includes a gas pressure measurement system.

Assignees

• Arcelormittal

Inventors

• Farahani Mahdi
• Farley Justin
• Tsvik George
• Lucena Mogollon Gabriel Jesus

Classifications

• H01J49/0422

  for gaseous samples (interfaces to gas chromatographs G01N30/7206) · CPC title

• G01K13/024

  of moving gases · CPC title

• F27D2021/0007

  Monitoring the pressure · CPC title

• F27B1/28 Primary

  Arrangements of monitoring devices, of indicators, of alarm devices · CPC title

• C21B13/02

  in shaft furnaces · CPC title