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HEAT INTEGRATING LOW TEMPERATURE COOLING OF RAW SYNGAS WITH ACID GAS REMOVAL PROCESS

IP.com Disclosure Number: IPCOM000228027D
Publication Date: 2013-Jun-03
Document File: 3 page(s) / 77K

Publishing Venue

The IP.com Prior Art Database

Abstract

In combined cycle power plants, quench gasifier technology generates a lot of low pressure saturated steam in the low temperature gas cooling section. The invention proposes a system in which raw syngas from gasification passes through the low temperature gas cooling from which the heat is recovered as LP steam and passed through the acid gas recovery (AGR) unit. The AGR unit, or methyl-diethanolamine (MDEA) stripper reboiler, is used to strip the acid gas from the rich amine. The above system enables routing over 75% of the LP steam to the AGR stripper, allowing heat integration across process technologies thereby negating the need to generate more low pressure steam in the power block to drive the AGR stripper reboiler. By removing the need to superheat large amounts of low pressure steam in the HRSG that heat is saved to design and optimize the power block more effectively.

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HEAT INTEGRATING LOW TEMPERATURE COOLING OF RAW SYNGAS WITH ACID GAS REMOVAL PROCESS

BACKGROUND

In combined cycle power plants, quench gasifier technology generates a lot of low pressure saturated steam in the low temperature gas cooling section. All this steam ends up being sent to the power block which is superheated in the HRSG and then let down, usually over a steam turbine. This large amount of low value steam does not provide the best and optimum energy recovery for the combined cycle power plant. A method is disclosed in this invention to integrate the low temperature heat with acid gas removal process to improve process efficiencies.

DRAWING

Heat integrating low temperature cooling of raw syngas with acid gas removal process is briefly described with reference to the following drawing in which:

Figure 1 shows a schematic diagram of the system for integrating cooling of raw syngas with acid gas removal process.

DETAILED DESCRIPTION

A portion of the combined cycle plant with the relevant section for integrating heat between the low temperature gas cooling and acid gas recovery is shown in Fig. 1. The raw syngas from gasification passes through the low temperature gas cooling from which the heat is recovered as LP steam and passed through the acid gas recovery (AGR) unit. The AGR unit, or methyl-diethanolamine (MDEA) stripper reboiler, is used to strip the acid gas from the rich amine.

Fig. 1   System for integrating cooling of raw syngas with acid gas removal process

The above system enables routing over 75% of the LP steam to the AGR stripper, allowing heat integration across process technologies thereby negating the need to g...