Energy efficient apparatus employing energy efficient process schemes providing enhanced integration of gasification-based multi-generation and hydrocarbon refining facilities and related methods

An apparatus for managing waste heat recovery through integration of a gasification-based multi-generation facility with a hydrocarbon refining system, the apparatus comprising:

• an integrated site energy management system comprising a plurality of thermal coupling arrangements between a gasification-based multi-generation system and a hydrocarbon refining system,
• the gasification-based multi-generation system 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 having a separation section comprising a solvent regenerator, and
• a gasification system comprising a gasification reactor configured to generate the raw syngas feed from a carbon-based feedstock;
• the hydrocarbon refining system comprising an aromatics system having a xylene products separation section comprising an Extract column and a Raffinate column;
• the integrated site energy management system comprising:
• a hot water system extending between the separation section of the acid gas removal system and the xylene products separation section of the aromatics system;
• a first xylene products separation section process-to-process heat exchanger unit positioned and configured to receive at least a first branch of a hot water stream from the hot water system and positioned and configured to receive an overhead vapor stream of an Extract column after passing through an overhead vapor condenser for the Extract column, to exchange heat energy from the overhead vapor stream of the Extract column to the first branch of the hot water stream to thereby add a thermal load to the first portion of the hot water stream and to cool and/or condense the overhead vapor stream of the Extract column;
• a second xylene products separation section process-to-process heat exchanger unit positioned and configured to receive the second branch of the hot water stream from the hot water system and positioned and configured to receive an overhead vapor stream of an Raffinate column after passing through an overhead vapor condenser for the Raffinate column, to exchange heat energy from the overhead vapor stream of the Raffinate column to the second branch of the hot water stream to thereby add a thermal load to the second portion of the hot water stream and to cool and/or condense the overhead vapor stream of the Raffinate column;
• a first acid gas removal system process-to-process heat exchanger unit positioned to receive a hot condensate stream from the gasification system and the raw syngas feed from the gasification system to provide heat energy to the raw syngas feed and to cool the hot condensate stream from the gasification system;
• a second acid gas removal system process-to-process heat exchanger unit positioned to receive the hot condensate stream received from the gasification system and the treated syngas feed to provide heat energy to the treated syngas feed and to further cool the hot condensate stream from the gasification system;
• a third acid gas removal system process-to-process heat exchanger unit positioned to receive a reactor effluent bottom stream from a contaminant hydrolysis reactor and at least a portion of a rich solvent bottom stream to provide heat energy to the rich solvent bottom stream and to cool the reactor effluent bottom stream;
• a forth acid gas removal system process-to-process heat exchanger unit defining a solvent regenerator reboiler positioned and configured to receive the hot water stream having heat energy exchanged thereto by the first and the second xylene product separation section process-to-process heat exchanger units defining added heat energy and to receive a solvent regenerator tray stream extracted from a solvent regenerator tray of the solvent regenerator to provide at least a portion of the added heat energy to the solvent regenerator tray stream to reboil the extracted solvent regenerator tray stream and remove the at least a portion of the added heat energy from the hot water stream to thereby cool the hot water stream;
• a fifth acid gas removal system process-to-process heat exchanger unit positioned to receive a first branch of a polished cold condensate stream from a condensate polishing plant or facility, and a solvent regenerator top stream from the solvent regenerator to provide heat energy to the first branch of the polished cold condensate stream and to cool the solvent regenerator top stream;
• a sixth acid gas removal system process-to-process heat exchanger unit positioned to receive a second branch of the polished cold condensate stream from the condensate polishing plant or facility, and the reactor effluent bottom stream from the contaminant hydrolysis reactor to provide heat energy to the second branch of the polished cold condensate stream and to cool the reactor effluent bottom stream;
• a seventh acid gas removal system process-to-process heat exchanger unit positioned to receive the hot condensate stream received from the gasification system and a demineralized water stream from a demineralized water tank to provide heat energy to the demineralized water stream and to further cool the hot condensate stream from the gasification system;
• an eighth acid gas removal system process-to-process heat exchanger unit positioned to receive the demineralized water stream from the demineralized water tank and a lean solvent bottom stream from the solvent regenerator to provide heat energy to the and to cool the lean solvent bottom stream;
• a first gasification system process-to-process heat exchanger unit positioned to receive the polished cold condensate stream and an overhead stream of a 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 a first branch of an oxygen feed to the gasification reactor to provide heat energy to the first branch of the oxygen feed and to remove at least a portion of the added thermal load added to the polished cold condensate stream;
• a third gasification system process-to-process heat exchanger unit positioned to receive a wastewater bottom stream from the sour water stripper and a second branch of the oxygen feed to the gasification reactor to provide heat energy to the second branch 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.