Device and method for introducing oxygen into a pressurized fluidized-bed gasification process

Patent metadata

Field	Value
Publication number	US-9862900-B2
Application number	US-201314421793-A
Country	US
Kind code	B2
Filing date	Aug 8, 2013
Priority date	Aug 14, 2012
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The invention relates to an oxygen lance that has at least three mutually coaxial pipes, each of which delimits at least one annular gap. The outermost pipe is designed to conduct superheated steam and has a steam supply point, the central pipe is designed as an annular gap, and the innermost pipe is designed to conduct oxygen at a temperature of no higher than 180° C. and has an oxygen supply point. A temperature sensor is arranged within the innermost pipe, said temperature sensor extending to just in front of the opening of the innermost pipe. The innermost pipe tapers in the form of a nozzle before opening; the innermost pipe opens into the central pipe; and the opening of the central pipe protrudes farther relative to the opening of the outermost pipe.

First claim

The invention claimed is:

1. An oxygen lance comprising:
an inner pipe including an inlet disposed at a proximal end thereof, a mouth disposed at a distal end thereof, and a tapered nozzle section disposed upstream of said mouth;
a middle pipe coaxially disposed around an outer surface of at least said distal end of said inner pipe and defining a middle annular gap between the outer surface of said inner pipe and an inner surface of said middle pipe, said middle pipe having a mouth disposed at a distal end thereof;
an outer pipe coaxially disposed around an outer surface of at least a portion of said middle pipe and defining an outer annular gap between the outer surface of said middle pipe and an inner surface of said outer pipe, said outer pipe having an inlet disposed at a proximal end thereof and a mouth disposed at a distal end of said outer pipe beyond which said mouth of said middle pipe extends, wherein the outer pipe extends distally beyond a location within the middle pipe where the mouth of the inner pipe terminates; and
a temperature probe disposed inside said inner pipe and having a distal end disposed upstream of said mouth of said inner pipe at said distal end thereof, wherein the temperature probe extends along a longitudinal axis of the inner pipe.

2. The oxygen lance of claim 1 , wherein said mouth of said middle pipe is open.

3. The oxygen lance of claim 1 , wherein said middle pipe includes a feed inlet and is configured to permit dry gas to flow through said middle pipe.

4. The oxygen lance of claim 3 , wherein said middle pipe has a tapered nozzle section disposed upstream of said mouth of said inner pipe.

5. The oxygen lance of claim 1 wherein the inlet of the inner pipe is an inlet, wherein the inner pipe is configured to permit oxygen having a maximum temperature of 180° C. to flow there through from the inlet to the mouth, wherein the middle pipe is configured to permit oxygen to flow out of the mouth of the inner pipe and into the middle pipe, wherein the inlet of the outer pipe is a steam feed inlet, wherein the outer pipe is configured to permit superheated steam to flow through the outer pipe.

6. The oxygen lance of claim 1 wherein the temperature probe measures a temperature of a substance flowing through the inner pipe.

7. The oxygen lance of claim 1 wherein the middle pipe has a constant diameter at the location where the mount of the inner pipe terminates.

8. The oxygen lance of claim 1 further comprising a regulating valve disposed upstream of the inlet of the inner pipe for regulating an amount of gas or stopping gas from being fed into the inner pipe based on measurements from the temperature probe.

9. The oxygen lance of claim 1 wherein the mouth of the middle pipe that extends beyond the mouth of the outer pipe has a constant diameter.

10. A method for introducing oxygen into a fluidized bed gasification reactor operated according to the HTW method, comprising:
providing an oxygen lance according to claim 1 ;
feeding moist gas into the outer pipe at a pressure above a pressure in the fluidized bed gasification reactor;
feeding oxygen into the inner pipe at a temperature of up to 180° C. and a pressure above a pressure in the fluidized bed gasification reactor;
expelling the oxygen from the mouth of the inner pipe into the middle pipe;
expelling an emerging free jet of gas from the mouth of the middle pipe, the emerging free jet of gas including at least the oxygen expelled from the inner pipe into the middle pipe;
expelling moist gas from the mouth of the outer pipe as a cladding flow surrounding the mouth of the middle pipe and the associated emerging free jet of gas expelled therefrom, wherein a flow velocity of the emerging moist gas is higher than a flow velocity of oxygen expelled from the inner pipe.

11. The method of claim 10 , further comprising:
feeding dry gas into the middle pipe;
mixing, in the middle pipe, the oxygen expelled from the inner pipe with the dry gas in the middle pipe, upstream of the mouth of the middle pipe, wherein said expelled emerging free jet of gas from said middle pipe is the mixed oxygen and dry gas; and
expelling moist gas from the mouth of the outer pipe as a cladding flow surrounding the mouth of the middle pipe and the associated emerging free jet of gas expelled therefrom, wherein a flow velocity of the emerging moist gas is higher than a flow velocity of the mixed oxygen and dry gas expelled from the middle pipe.

12. The method of claim 10 , wherein the moist gas is superheated steam.

13. The method of claim 10 , wherein the moist gas is a mixture of carbon dioxide and superheated steam.

14. The method of claim 10 , wherein the dry gas is carbon dioxide.

15. The method of claim 10 , wherein the dry gas is nitrogen.

16. The method of claim 10 , wherein the dry gas is a mixture of carbon dioxide and of air.

17. The method of claim 10 , wherein the dry gas is a mixture of carbon dioxide and of nitrogen.

18. The method of claim 10 , wherein the dry gas is not moved during operation.

Assignees

• Thyssenkrupp Ind Solutions Ag

Inventors

• Abraham Ralf
• Pavone Domenico
• Schulze Eckel Reinald
• Toporov Dobrin
• Hafner Simon Boris

Classifications

• F27D3/16

  Introducing a fluid jet or current into the charge (F27D3/18 takes precedence) · CPC title

• F27B15/10

  Arrangements of air or gas supply devices · CPC title

• F27B1/16

  Arrangements of tuyeres · CPC title

• C21C5/5217

  equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace · CPC title

• C21C5/48

  Bottoms or tuyéres of converters · CPC title