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BOG Compressor Quench System Optimization

IP.com Disclosure Number: IPCOM000247010D
Publication Date: 2016-Jul-25
Document File: 2 page(s) / 68K

Publishing Venue

The IP.com Prior Art Database

Abstract

Boil Off Gas handling systems within LNG plants and receiving terminals have to control the temperature of the boil of gas entering the gas compressors to limit actual volume flow rates into the compressor (to keep within design capacity of the centrifugal compressor) and to limit the compressor discharge temperatures to within the design temperature limits of the compressor and downstream equipment. This disclosure addresses this aspect

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Problem: Boil Off Gas handling systems within LNG plants and receiving terminals have to control the temperature of the boil of gas entering the gas compressors to limit actual volume flow rates into the compressor (to keep within design capacity of the centrifugal compressor) and to limit the compressor discharge temperatures to within the design temperature limits of the compressor and downstream equipment. This control is normally achieved through spraying LNG into the BOG compressor suction scrubber utilizing the latent heat of vaporization to cool the inlet gas stream. This approach of utilizing injection/spray systems within suction scrubbers adds size, weight and complexity to the facilities. This adds significant project cost especially when facilities need to be modularized for installation in remote places.

The proposed concepts is to inject the LNG using a device that will atomize the liquid without the scrubber, such that the LNG will vaporize on entering the gas stream in the suction line, recycle line and/or within the compressor (at one or more injection points) providing the cooling needed to control actual volume flow for subsequent downstream stages and control final discharge temperature.

It is assumed that the gas stream in this application would be greater than 50% methane.

This same concept of injecting a liquid that will vaporize and cool the gas stream could also be used at other locations within a compression system. For example it could be injected...