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Heat Integration Study on Cryogenic and Product Recovery Unit of Gas Processing Plant

Nguyen Thi Quynh Nga, Nguyen (2007) Heat Integration Study on Cryogenic and Product Recovery Unit of Gas Processing Plant. Masters thesis, Universiti Teknologi Petronas.

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Abstract

The production and consumption of natural gas is on the rise throughout the world as the result of its wide availability, ease of transportation and use as well as clean burning characteristics. The first and second generation gas processing plants, designed and built in the 1960s and 1970s were bogged down by operational inflexibility and CO2 freezing due to the rapid change of product values. Even most modern gas processing plants are encountering problems related to operating flexibility, instability of operational conditions due to vapor-liquid equilibrium, CO2 solid formation and energy efficiency. Ortloff have recently developed new NGL recovery processes on the basis of vapor-split concept. While the Ortloff processes offer relief to the first three problems in gas processing plants, huge energy consumption remains a major concern. A typical gas processing plant consists of two main processing sections, i. e. a cryogenic section and product recovery section. Of the two sections, cryogenic section consumes a huge amount of energy, especially by its cold utility due to the sub-ambient operating condition required. Meanwhile, steam generation for reboiling purposes at the product recovery section also contributes to the huge energy consumption. Ultimately, both result in substantial utility cost to the plant operations; therefore optimizing energy consumption in both areas is essential to improving plant profitability as it results in lower utility cost. This research looks for improvement opportunities in energy consumption in these two sections based on pinch analysis and maximizing the power generated from turboexpander. The study explores the utilization of available cold energy extracted from the feed in order to reduce the cold utility requirement in cryogenic area. The study is able to save 6% on refrigeration load for cryogenic area and generate 36% more power from the turbo expander. This could generate predicted annual savings of RM900k for this area. For product recovery area, this study introduces a prefractionator arrangement in place of a conventional depropansier and debutanizer arrangement. Although thermal coupling arrangement requires refrigeration for condenser cooling, nevertheless it generates 54% savings on steam consumption and 37% savings on cooling duty. This is equivalent to RM 2.9mil as predicted annual savings for the plant. Moreover, there are some loose end heat exchangers that could give about RM350k savings per annum for operating cost.

Item Type: Thesis (Masters)
Subject: T Technology > TP Chemical technology
Divisions: ?? sch_che ??
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:18
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/1557

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