Energy efficient gasification based multi generation apparatus employing energy efficient gasification plant-directed process schemes and related methods

Patent metadata

Field	Value
Publication number	US-9605221-B2
Application number	US-201514692657-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Jun 28, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

Energy-efficient gasification-based multi-generation apparatus, facilities, or systems, and methods of modifying existing gasification-based multi-generation apparatus and the various conventional thermal coupling arrangements, are provided. An exemplary gasification-based multi-generation apparatus includes a gasification system configured to generate the raw syngas feed from a carbon-based feedstock. The gasification system includes a gasification plant or facility, a sour water stripping plant or facility comprising a sour water stripper, a gasification reactor, and a gasification system energy management system. The gasification system energy management system comprises a third gasification system process-to-process heat exchanger unit positioned to receive a wastewater bottom stream from the sour water stripper and to receive at least a portion of an oxygen feed to the gasification reactor to provide heat energy to the at least a second portion of the oxygen feed to the gasification reactor and to cool the wastewater bottom stream from the sour water stripper. The sour water stripping plant or facility is integrated into the gasification plant or facility through at least the wastewater bottom stream from the sour water stripper.

First claim

That claimed is:

1. A gasification-based multi-generation apparatus, comprising:
a gasification system configured to generate the raw syngas feed from a carbon-based feedstock, the gasification system comprising:
a gasification plant or facility;
a condensate polishing plant or facility;
a sour water stripping plant or facility comprising a sour water stripper;
a gasification reactor; and
a gasification system energy management system;

wherein the gasification system energy management system comprises:
a first gasification system process-to-process heat exchanger unit positioned to receive a polished cold condensate stream and an overhead stream of the sour water stripper to add a thermal load to the polished cold condensate stream and to cool the overhead stream of the sour water stripper;
a second gasification system process-to-process heat exchanger unit positioned to receive the polished cold condensate stream having the added thermal load from the overhead stream of the sour water stripper and to receive at least a portion of an oxygen feed to the gasification reactor to provide heat energy to the at least a portion of the oxygen feed and to remove at least a portion of the added thermal load added to the polished cold condensate stream; and
a third gasification system process-to-process heat exchanger unit positioned to receive a wastewater bottom stream from the sour water stripper and to receive at least a portion of the oxygen feed to the gasification reactor to provide heat energy to the at least a second portion of the oxygen feed to the gasification reactor and to cool the wastewater bottom stream from the sour water stripper; and
a fourth gasification system process-to-process heat exchanger unit positioned to receive a hot condensate stream and the oxygen feed to the gasification reactor to provide heat energy to heat the oxygen feed to the gasification reactor and to cool the hot condensate stream;

wherein the sour water stripping plant or facility is integrated into the gasification plant or facility through at least the wastewater bottom stream from the sour water stripper.

2. The apparatus as defined in claim 1 ,
wherein at least a portion of the oxygen feed to the gasification reactor received by the third gasification system process-to-process heat exchanger unit is substantially the entire oxygen feed to the gasification reactor.

3. The apparatus as defined in claim 1 , further comprising:
an acid gas removal system configured to remove acidic contaminants from a raw syngas feed to thereby provide a treated syngas feed, the acid gas removal system comprising an acid gas removal plant or facility;
wherein the at least a portion of an oxygen feed to the gasification reactor received by the second gasification system process-to-process heat exchanger unit comprises a first branch of the oxygen feed to the gasification reactor;
wherein the at least a portion of an oxygen feed to the gasification reactor received by the third gasification system process-to-process heat exchanger unit comprises a second branch of the oxygen feed to the gasification reactor;
wherein the acid gas removal system energy management system comprises:
a sixth acid gas removal system process-to-process heat exchanger unit positioned to receive at least a portion of the polished cold condensate stream from the condensate polishing plant or facility and a reactor effluent bottom stream from a contaminant hydrolysis reactor to provide heat energy to the at least a portion of the polished cold condensate stream and to cool the reactor effluent bottom stream;

the acid gas removal plant or facility being integrated with the condensate polishing plant or facility through the at least a portion of the polished cold condensate stream received by the sixth acid gas removal system process-to-process heat exchanger unit,
the condensate polishing plant or facility, the acid gas removal plant or facility, the sour water stripping plant or facility being integrated with the gasification plant or facility through at least the polished condensate stream received by the sixth acid gas removal system process-to-process heat exchanger unit and the first and the second gasification system process-to-process heat exchanger units, en route to a power generation plant or facility, working as a buffer to indirectly gather heat energy from the bottom stream of the contaminant hydrolysis reactor and the overhead stream of the sour water stripper to heat the first branch of the oxygen feed to the gasification reactor, and
the sour water stripping plant or facility being further integrated with the gasification plant or facility through at least the wastewater bottom stream from the sour water stripper en route to a bio treatment unit, plant or facility, to provide heat energy to heat the second branch of the oxygen feed to the gasification reactor.

4. The apparatus as defined in claim 1 ,
wherein the at least a portion of an oxygen feed to the gasification reactor received by the third gasification system process-to-process heat exchanger unit comprises a second branch of the oxygen feed to the gasification reactor; and
wherein the gasification system energy management system comprises:
a high-pressure tempered water circuit;
a fifth gasification system process-to-process heat exchanger unit positioned to receive a tempered water stream from the tempered water circuit and the overhead stream of the sour water stripper to add a thermal load to the tempered water and to cool the overhead stream of the sour water stripper; and
a sixth gasification system process-to-process heat exchanger unit positioned to receive the tempered water stream having the added thermal load from the overhead stream of the sour water stripper and the first branch of the oxygen feed to the gasification reactor to provide heat energy to the first branch of the oxygen feed and to remove at least a substantial portion of the added thermal load added to the tempered water stream,

the sour water stripping plant or facility being integrated with the gasification plant or facility through at least the tempered water circuit functioning as a buffer to collect the thermal load from the overhead stream of the sour water stripper to heat the first branch of the oxygen feed to the gasification reactor, and the wastewater bottom stream from the sour water stripper provide heat energy to heat the second branch of the oxygen feed while en route to a bio treatment unit, plant or facility, to provide heat energy to heat the second branch of the oxygen feed to the gasification reactor.

5. The apparatus as defined in claim 1 , further comprising;
an acid gas removal system configured to remove acidic contaminants from a raw syngas feed to thereby provide a treated syngas feed, the acid gas removal system comprising an acid gas removal plant or facility;
wherein the at least a portion of an oxygen feed to the gasification reactor received by the second gasification system process-to-process heat exchanger unit comprises the first branch of the oxygen feed to the gasification reactor;
wherein the at least a portion of an oxygen feed to the gasification reactor received by the third gasification system process-to-process heat exchanger unit comprises a second branch of the oxygen feed to the gasification reactor;
wherein the acid gas removal system energy management system comprises a sixth acid gas removal system process-to-process heat exchanger unit positioned to receive at least a portion of the polished cold condensate stream from the condensate polishing plant or facility, and a reactor effluent bottom stream from a contaminant hydrolysis reactor to provide heat energy to the at least a portion of the polished cold condensate stream and to cool the reactor effluen

Assignees

• Saudi Arabian Oil Co

Inventors

• Noureldin Mahmoud Bahy

Classifications

• Y02E20/18

  Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS] · CPC title

• C10J2300/1892

  with one stream being water/steam · CPC title

• C10J2300/1861

  Heat exchange between at least two process streams · CPC title

• C10J2300/169

  with water treatments · CPC title

• C10J3/80

  with arrangements for preheating the blast or the water vapour · CPC title