HALIDES REMOVAL WASHING SYSTEM FOR A HYDROCARBON STREAM

Abstract

A halides removal washing system for absorbing halides from a process gas within a process gas duct comprising a wash water injection nozzle and anti-precipitation means arranged around the nozzle, injection pipe and within the process gas duct.

Claims

1. A halides removal washing system comprising a process gas duct for process gas comprising hydrocarbons and halides, an injector pipe extending into the process gas duct, said injector pipe has a wash water inlet in a first end of the injector pipe arranged outside the process gas duct and a wash water outlet with an injector nozzle in a second end of the injector pipe adapted to spray the wash water into the process gas in the process gas duct downstream of the injector nozzle.

2. A halides removal washing system according to claim 1, further comprising anti-precipitation means arranged around at least a part of the injector pipe which extends into the process gas duct.

3. A halides removal washing system according to claim 1, further comprising anti-precipitation means arranged around at least a part of the injector nozzle.

4. A halides removal washing system according to claim 2, wherein the anti-precipitation means is a heat insulation.

5. A halides removal washing system according to claim 2, wherein the anti-precipitation means is an injector purge channel adapted to provide a relative hot injector purge fluid compared to the temperature of the wash water.

6. A halides removal washing system according to claim 2, wherein the anti-precipitation means is an electrical heating wiring.

7. A halides removal washing system according to claim 1, wherein the process gas duct has an anti-corrosion liner arranged on the inside surface of the process gas duct downstream of the injector nozzle.

8. A halides removal washing system according to claim 1, wherein an anti-corrosion liner is arranged within the process gas duct adjacent to the inside surface of the process gas duct downstream of the injector nozzle with a gap between the inside surface of the process gas duct and the anti-corrosion liner allowing for a duct purge fluid between the anti-corrosion liner and the process gas duct.

9. A halides removal washing system according to claim 1, wherein an anti-corrosion liner is arranged within the process gas duct adjacent to the inside surface of the process gas duct downstream of the injector nozzle with a gap of 0.2-50 mm between the inside surface of the process gas duct and the anti-corrosion liner allowing for a duct purge fluid between the anti-corrosion liner and the process gas duct.

10. A halides removal washing system according to claim 8, further comprising a sealing between the anti-corrosion liner and the process gas duct and a duct purge fluid connection to the process gas duct downstream of the injector nozzle adapted to purge fluid into the gap between the anti-corrosion liner and the process gas duct.

11. A halides removal washing system according to claim 8, comprising a duct purge fluid consumption monitoring system adapted to provide an alarm output if the duct purge fluid consumption exceeds a pre-set value.

12. A halides removal washing system according to claim 1, further comprising at least one fluid mixer element arranged within the process gas duct downstream the injector nozzle.

13. A halides removal washing system according to claim 1, comprising a plurality of injector pipes and a plurality of injector nozzles.

14. A halides removal washing system according to claim 1, comprising a plurality of process gas ducts and a plurality of injector pipes and injector nozzles; a common process gas duct upstream the injector nozzles and a plurality of process gas ducts downstream each of the injector nozzles.

15. Use of a halides removal washing system according to claim 1, in a hydrotreatment process.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0022] FIG. 1 shows an overview of a halides removal washing system.

[0023] FIG. 2 shows a detailed view of a part of a halides removal system.

POSITION NUMBERS

[0024] 01. Process gas duct. [0025] 02. Injector pipe. [0026] 03. Injector nozzle. [0027] 04. Injector connection flange. [0028] 05. Heat insulation. [0029] 06. Injector purge channel. [0030] 07. Heat tracing. [0031] 08. Duct liner. [0032] 09. Duct sealing. [0033] 10. Mixing element. [0034] 11. Duct purge.

DETAILED DESCRIPTION OF THE FIGURES

[0035] FIG. 1 shows an overview of a halides removal washing system according to an embodiment of the invention. In this embodiment a manifold solution is used, with a plurality, in this case four process gas ducts 01 connected to a common process gas duct. For simplicity, only one of the process gas ducts has position numbering, it is to be understood, that the other three process gas ducts comprise similar components with the like position numbers. Within each of the process gas ducts an injector pipe 02 is arranged through the common process gas duct, upstream and within the process gas duct downstream of the common process gas duct. At a first end of the injector pipe, an injector connection flange 04 provides for a wash water inlet. At the second end of the injector pipe an injector nozzle 03 is arranged in fluid connection to the injector pipe and the injector connection flange. The injector nozzle is adapted to spray a wash water into the process gas stream flowing in the process gas duct. Downstream the injector nozzle and within the process gas duct a number of mixing elements 10 are arranged in series to provide mixing of the process gas.

[0036] In FIG. 2 the part of the halides removal washing system with the injector pipe and -nozzle is shown in more detail. In this larger view, it can be seen that injector pipe is provided with both a heat insulation 05 and a heat tracing 07 to prevent any precipitation of the relative hot process gas on the injector pipe with the relative cold wash water. Also, the injector nozzle has a heat tracing and it further has an injector purge channel 06 around the nozzle also to prevent precipitation of the relative hot process gas.

[0037] The process gas duct has a duct liner 08 arranged within, adjacent to the inner surface of the process gas duct, starting a little upstream of the injector nozzle and stretching downstream of the injector nozzle. The liner is arranged with a gap between the liner ant the inner surface of the process gas duct, thereby allowing for a duct purge 11 fluid flow. To control this purge fluid flow, a duct sealing 09 is arranged at the start of the liner upstream, between the liner and the inner surface of the process gas duct.