# US 2020/0399548 A1 · Gas purification device

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- Number: US 2020/0399548 A1
- Document ID: US20200399548A1
- Status: Published application
- Kind: A1
- Application number: 16/979,100
- Filed: 2019-03-05
- Published: 2020-12-24
- Earliest claimed: 2018-03-14
- Assignees: Mitsubishi Heavy Industries Engineering, Ltd.
- Applicants: Mitsubishi Heavy Industries Engineering, Ltd.
- Inventors: Kaori Yoshida; Ayumu Yamazaki; Rikio Kan; Seiji Kakesako
- Web page: https://patentgrep.com/patent/US20200399548A1

## CPC

- C10K 1/004: {Sulfur containing contaminants, e.g. hydrogen sulfide}
- C10K 1/10: with aqueous liquids {(alkaline reacting aqueous liquids C10K1/12)}
- B01D 53/1406: {Multiple stage absorption}
- B01D 53/1418: {Recovery of products}
- B01D 53/1425: {Regeneration of liquid absorbents}
- B01D 53/1468: {Removing hydrogen sulfide}
- B01D 53/18: Absorbing units; Liquid distributors therefor (B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32)
- B01D 53/52: Hydrogen sulfide
- B01D 53/56: Nitrogen oxides (B01D53/60 takes precedence)
- B01D 53/58: Ammonia
- B01D 53/75: Multi-step processes
- B01D 53/76: Gas phase processes, e.g. by using aerosols
- C01B 3/02: Production of hydrogen; Production of gaseous mixtures containing hydrogen
- C01B 3/52: by contacting with liquids; Regeneration of used liquids
- C10J 3/82: Gas withdrawal means
- C10K 1/006: {Hydrogen cyanide}
- C10K 1/101: {with water only}
- C10K 1/34: by catalytic conversion of impurities to more readily removable materials
- F23G 7/06: of waste gases or noxious gases, e.g. exhaust gases (exhaust apparatus for engines with means for rendering the exhaust innocuous, e.g. by thermal or catalytic conversion, F01N3/08; combustion of uncombusted material from primary combustion within apparatus for combustion of solid or fluent fuel F23B {, of non combusted material from primary combustion of solid fuels; of gases produced by primary combustion of solid fuels F23B90/04}, F23C)
- B01D 2252/103: Water
- B01D 2252/204: Amines
- B01D 2256/16: Hydrogen
- B01D 2256/20: Carbon monoxide
- B01D 2257/304: Hydrogen sulfide
- B01D 2257/406: Ammonia
- C01B 2203/0415: Purification by absorption in liquids
- C01B 2203/0485: the impurity being a sulfur compound
- C10J 2300/1618: Modification of synthesis gas composition, e.g. to meet some criteria
- Y02P 20/129: Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
- C10K: PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- 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}
- C10J: PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES (synthesis gas from liquid or gaseous hydrocarbons C01B; underground gasification of minerals E21B43/295); CARBURETTING AIR OR OTHER GASES
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A gas purification device removes a part of ammonia contained in a first gas; recovers a first off-gas containing the removed ammonia, removes hydrogen sulfide and ammonia from a second gas produced by removing the part of ammonia, recovers a second off-gas containing the removed hydrogen sulfide and ammonia, and combusts the first off-gas and the second off-gas. The gas purification device includes: a first combustion chamber in which combustion is performed in a reducing atmosphere; a second combustion chamber in which combustion is performed in a reducing atmosphere downstream of the first combustion chamber; and a third combustion chamber in which combustion is performed in an oxidizing atmosphere downstream of the second combustion chamber. The first off-gas flows into the first combustion chamber and the second off-gas flows into the third combustion chamber.

## Claims

### Claim 1

A gas purification device for purifying a first gas containing ammonia and hydrogen sulfide, comprising:
an ammonia removal part configured to remove a part of ammonia contained in the first gas from the first gas;
a first off-gas recovery part configured to recover a first off-gas containing ammonia removed by the ammonia removal part;
a hydrogen sulfide/ammonia removal part configured to remove hydrogen sulfide and ammonia from a second gas produced by removing the part of ammonia by the ammonia removal part;
a second off-gas recovery part configured to recover a second off-gas containing hydrogen sulfide and ammonia removed by the hydrogen sulfide/ammonia removal part; and
a combustion part configured to combust the first off-gas and the second off-gas,
wherein the combustion part includes:
a first combustion chamber in which combustion is performed in a reducing atmosphere;
a second combustion chamber in which combustion is performed in a reducing atmosphere downstream of the first combustion chamber; and
a third combustion chamber in which combustion is performed in an oxidizing atmosphere downstream of the second combustion chamber, and
wherein the gas purification is configured such that the first off-gas flows into the first combustion chamber, and the second off-gas flows into the third combustion chamber.

### Claim 2 (depends on 1)

The gas purification device according to claim 1,
wherein the second gas contains 2 ppm or more of ammonia.

### Claim 3 (depends on 1)

The gas purification device according to claim 1,
wherein a removal rate of removing ammonia from the first gas is 98% or less.

### Claim 4 (depends on 1)

The gas purification device according to claim 1,
wherein a part of the second off-gas flows into the second combustion chamber.

### Claim 5 (depends on 1)

The gas purification device according to claim 1, further comprising a denitration part configured to denitrate a flue gas flowing out of the third combustion chamber.

### Claim 6 (depends on 1)

The gas purification device according to claim 1, further comprising a converter configured to hydrolyze hydrogen cyanide and carbonyl sulfide contained in a syngas obtained by gasification of coal to produce the first gas.