# US 4,394,119 A · Process for combusting ammonia-containing gases which also contain hydrogen sulfide

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- Number: US 4,394,119 A
- Document ID: US4394119A
- Status: Granted
- Kind: A
- Application number: 06/231,839
- Filed: 1981-02-05
- Granted: 1983-07-19
- Earliest claimed: 1980-02-26
- Assignees: Shell Oil Company
- Inventors: Jan Waller; Philippus Loof
- Web page: https://patentgrep.com/patent/US4394119A

## CPC

- B01D 53/58: Ammonia
- C01B 17/0417: {Combustion reactors}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

An ammonia-containing gas stream and a hydrogen sulfide-containing gas stream are combusted to a mixture of SO.sub.2 and H.sub.2 S in a ratio of substantially 1:2 in the thermal zone of a sulfur recovery unit by feeding said streams separately to a burner comprising a double-barrelled gun of two concentric tubes, the ammonia-containing gas stream being fed to the inner tube of the gun and the hydrogen sulfide-containing gas stream being fed to the outer tube.

## Claims

### Claim 1

A process for combusting two gas streams, a first stream containing ammonia and hydrogen sulfide gases, and a second stream containing hydrogen sulfide gas and no ammonia, in the thermal zone of a sulfur recovery unit in which hydrogen sulfide-containing gases are partially combusted to a mixture of sulfur dioxide and hydrogen sulfide in a ratio of substantially 1:2 by supplying said hydrogen sulfide-containing gases to a burner consisting of a double gun having two concentric tubes and surrounded by an air register, which burner debouches into a mixing zone followed by a combustion zone, comprising supplying said second stream comprising primarily hydrogen sulfide-containing gases to the mixing zone via the outer of the two concentric tubes and mixing said stream in said mixing zone with an oxygen-rich gas or gas mixture supplied to the mixing zone via the air register, and separately supplying said first stream comprising primarily ammonia-containing gases to the thermal zone via the inner of the two concentric burner gun tubes, said ammonia-containing gases leaving the burner and entering the mixing zone at about the plane of emergence of said hydrogen sulfide-containing gases, and combusting said gases in the combustion zone.

### Claim 2 (depends on 1)

The process of claim 1 wherein said ammonia-containing gases have a temperature of at least 85.degree. C.

### Claim 3 (depends on 1, 2)

The process of claim 1 or 2 wherein the inner of the two concentric tubes contains a central steam supply tube.

### Claim 4 (depends on 3)

The process of claim 3 wherein steam is supplied to the mixing zone to be mixed with the gas mixture formed there.

### Claim 5 (depends on 1)

The process of claim 1 wherein the mixture of the first stream comprising primarly ammonia-containing gases and the second stream comprising primarily hydrogen sulfide-containing gases comprises a total acid gas mixture having an ammonia content of at least 3% by volume.

### Claim 6 (depends on 5)

The process of claim 5 wherein the total acid gas mixture has an ammonia content of 3-15% by volume.

### Claim 7 (depends on 6)

The process of claim 6 wherein the residence time of the total gas mixture in a reaction chamber following the combustion chamber is at least 0.4 sec.

### Claim 8 (depends on 7)

The process of claim 7 wherein the residence time is 0.5-1.2 seconds.