High temperature quench system and process

Patent metadata

Field	Value
Publication number	US-9328038-B2
Application number	US-201414316140-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 28, 2013
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A quench system and process for cooling high temperature gases is presented. The quench system includes a frustum, or conic, shaped section having an inlet at the smaller end of the quench section and the outlet at the larger end of the quench section. The system includes spray nozzles having openings flush with the wall of the quench section. The process includes spraying a large volume of liquid in small droplets for rapid heat transfer and vaporization of the quench liquid.

First claim

The invention claimed is:

1. A process for the quenching of a high speed vapor flow, comprising:
passing the high speed vapor flow to a quench section; and
spraying a liquid into the quench section, wherein the liquid has a high heat of vaporization, and the liquid is sprayed into the quench section with droplets having a mean diameter less than 500 micrometers;
wherein the quench section comprises a frustum shape with an inlet, an outlet, and quench section wall; and
a plurality of nozzles embedded in the quench wall with the nozzles substantially flush with the quench section wall.

2. The process of claim 1 wherein the high speed vapor flow enters the quench section at a temperature of at least 1000° C.

3. The process of claim 2 wherein the high speed vapor flow enters the quench section at a temperature between 1000° C. and 2500° C.

4. The process of claim 1 wherein the quench liquid is a not reactive liquid relative to acetylene.

5. The process of claim 4 wherein the quench liquid is selected from the group consisting of water, wet steam, liquid hydrocarbons, and mixtures thereof.

6. The process of claim 1 wherein the quench section comprising a frustum has a first quarter section beginning at the quench section inlet and extending to one quarter the axial length from the quench section inlet to the quench section outlet, wherein the spraying liquid is sprayed into the high speed vapor flow in the first quarter section.

7. The process of claim 1 wherein the spraying is performed by a plurality of nozzles disposed circumferentially around the quench section wall to deliver the quench liquid in a substantially equal amounts from each nozzle.

8. The process of claim 1 wherein the quench section has a central axis, and the plurality of nozzles are distributed circumferentially in a first row around the quench section wall, and are disposed within two circular sections where each circular section is oriented at an angle between 0 and 120 degrees to the quench section central axis, and wherein the spraying of the quench liquid is delivered to the quench section in the two regions.

9. The process of claim 8 wherein a second row of nozzles has an orientation at an angle relative to the central axis less than the orientation angle for the first row of nozzles.

10. The process of claim 1 wherein the spraying liquid is delivered into the quench section with droplets having a mean diameter in the range from 50 micrometers to 500 micrometers.

11. The process of claim 10 wherein the spraying liquid is delivered into the quench section with droplets having a mean diameter in the range from 70 micrometers to 200 micrometers.

12. The process of claim 1 wherein the spraying liquid is delivered into the quench section through atomization and the droplets are delivered with a mean diameter in the range from 10 micrometers to 200 micrometers.

13. The process of claim 12 wherein the spraying liquid is delivered into the quench section through atomizing with a gas and the droplets are delivered with a mean diameter in the range from 25 micrometers to 100 micrometers.

14. The process of claim 1 wherein the high speed vapor flow entering the quench section is in the range of 100 m/s to 1000 m/s.

15. The process of claim 1 wherein the high speed vapor flow enters the quench section at a pressure between 100 kPa to 1 MPa.

16. The process of claim 1 wherein the quench liquid is sprayed to the quench section at a rate between 0.1 kg/s and 2 kg/s per kg of gas entering the quench section.

17. The process of claim 1 wherein the quench liquid is sprayed at conditions to provide a Rosin-Rammler distribution of spray droplets.

18. The process of claim 1 wherein the quench liquid has a nozzle exit velocity between 10 m/s and 200 m/s.

19. The process of claim 1 wherein the quench liquid has a momentum flux between 2×10 6 N-s/(m 2 -s) and 3×10 7 N-s/(m 2 -s).

20. The process of claim 1 wherein the ratio of the momentum flux of the quench liquid to the hot gas entering the quench section is between 20 and 1000.

Assignees

• Uop Llc

Inventors

• Shafe Peter
• Sattar Aziz
• Mostofi-Ashtiani Mohammad Reza
• Leonard Laura E
• Gattupalli Rajeswar

Classifications

• F28D2021/0059

  for petrochemical plants · CPC title

• C07C2/78 Primary

  Processes with partial combustion · CPC title

• C07C11/24

  Acetylene (production of acetylene gas by wet methods C10H) · CPC title