Modern Approach for Determination of Natural Gas Composition and Heating Value at Custody Transfer

2018 ◽  
Author(s):  
Ukkirapandian Veerakumar ◽  
Sanjay Singh Lallan ◽  
Zeyad Bahumaish ◽  
Ahmad Abbas
Keyword(s):  
Natural Gas ◽  
Gas Composition ◽  
Modern Approach ◽  
Heating Value

Downhole measurements and determination of natural gas composition using Raman spectroscopy

2019 ◽  
Vol 65 ◽  
pp. 25-31 ◽  
Author(s):  
K.M. Dąbrowski ◽  
Sz Kuczyński ◽  
J. Barbacki ◽  
T. Włodek ◽  
R. Smulski ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Natural Gas ◽  
Gas Composition ◽  
Downhole Measurements

Statistical Determination of Natural Gas Superheat Requirements

2002 ◽  
Author(s):  
Colin Wilkes
Keyword(s):  
Natural Gas ◽  
General Equation ◽  
Temperature Drop ◽  
Dew Point ◽  
Gas Composition ◽  
Control Valves ◽  
Temperature Loss ◽  
Condensate Formation ◽  
Statistical Determination

The ASME Fuel Specification B133.7M [1] states that a typical margin of 25 to 30° C (45 to 54° F) of superheat is used for natural gas fuel but offers no basis for the estimate. The purpose of this paper is to propose a method for the safe determination of superheat that is less conservative, yet will meet the six sigma requirement of less than 4 defects (condensate formation) in one million opportunities. A drop in the total temperature of natural gas will be experienced as the gas expands in pressure reducing stations and across control valves. If the temperature falls below the hydrocarbon or moisture dew point, condensation will take place and liquids will collect or will be entrained with the gas. The temperature drop is inversely proportional to the pressure drop and is often termed ‘Joule-Thomson cooling’ or ‘J-T cooling’. The rate of cooling is described by the Joule-Thomson coefficient that can be determined by experiment or calculated from the gas composition. Superheating the gas prior to expansion can prevent condensation. The degree of superheat required for hydrocarbons, however, is often greater than the expected temperature loss across the valve as the hydrocarbon dew point may increase as the pressure falls. This paper describes a method for determining the quantity of superheat required for a specific gas composition and develops a general equation in terms of gas supply pressure that will satisfy the needs for the majority of natural gases. The general equation is based on the statistical analysis of superheat requirements for over 230 natural and liquefied natural gas compositions. A similar equation is also presented that describes the superheat requirements to avoid moisture condensation. The two equations can be used to specify the heating requirements upstream of pressure reducing stations or control valves.

scholarly journals The effect of important parameters on the natural gas vehicles driving range

2012 ◽  
Vol 14 (4) ◽  
pp. 61-68 ◽  
Author(s):  
Mahmood Farzaneh-Gord ◽  
Hamid Reza Rahbari ◽  
Hossin Nikofard
Keyword(s):  
Natural Gas ◽  
Storage Capacity ◽  
Cylinder Pressure ◽  
Gas Composition ◽  
Heating Value ◽  
Engine Efficiency ◽  
Gas Heating ◽  
Driving Range ◽  
Temperature And Pressure ◽  
Natural Gas Vehicles

Abstract One of the most important issues regarding Natural Gas Vehicles (NGVs) is the Driving Range, which is defined as capability of a NGV to travel a certain distance after each refueling. The Driving Range is a serious obstacle in the development and growth of NGVs. Thus the necessity of studying the effects of various parameters on the Driving Range could be realized. It is found that the on-board storage capacity and the natural gas heating value have the greatest effect on the Driving Range. The charged mass of NGV cylinders is varied due to the natural gas composition and the final in-cylinder values (temperature and pressure). Underfilling of NGV cylinders, during charging operations, is a result of the elevated temperature which occurs in the NGV storage cylinder, due to compression and other processes could be overcome by applying extensive over-pressurization of the cylinder during the fuelling operation. Here, the effects of the most important parameters on the Driving Range have been investigated. The parameters are natural gas composition, engine efficiency and final NGV on-board in-cylinder temperature and pressure. It is found that, the composition has big effects on the Driving Range. The results also show that as final in-cylinder pressure decreases (or temperature increases), the Driving Range will be increased.

scholarly journals An application of a Raman scattering analyzer for the determination of natural gas composition at a processing plant

2016 ◽  
Vol 33 (3) ◽  
pp. 619
Author(s):  
Tomas Włodek ◽  
Szymon Kuczyński ◽  
Rafał Smulski ◽  
Krzysztof Polański
Keyword(s):  
Natural Gas ◽  
Raman Scattering ◽  
Processing Plant ◽  
Gas Composition
Sign in / Sign up

Export Citation Format

Share Document