Wet natural gas sampling method and apparatus therefore
A system for on-stream sampling of pressurized process gas such as natural gas or the like, said pressurized process gas having liquid entrained therein, or otherwise referenced as “wet”. The preferred embodiment of the present invention contemplates a system for obtaining an accurate sample of said wet process gas, as well as providing an apparatus for obtaining same.
1. The method of sampling a gas stream having entrained liquid therein in a pipeline, comprising the steps of:
a. providing a housing having a length and a width, and an opening formed through the wall of said pipeline, so as to provide access to said gas stream having liquid entrained therein;
b. extending from said housing first and second spaced plates into said gas stream from said housing, said first and second spaced plates oriented so as to allow said gas stream to pass therebetween in relatively unobstructed fashion to minimize flow disturbance, providing isokinetic flow therebetween;
c. extending from said housing a container having an open bottom formed to envelope said first plate and engage said second plate, so as to contain a fluid sample of said gas stream between said first and second plates, providing a contained fluid sample;
d. simultaneously retracting into said housing said container and said first and second plates enveloping said fluid sample into said housing, while maintaining said contained fluid sample therein.
2. The method of claim 1 , wherein there is further provided after step “d” the added step “e” of heating said contained fluid sample to vaporize the sample fluid contents therein, providing a vaporized sample.
3. The method of claim 2 , wherein there is further provided after step “e” the added step “f” of analyzing said vaporized sample.
4. The method of claim 3 , wherein there is further provided after step “b” the added step “b1” of blocking the opening of said housing at said pipeline with a barrier having the profile of the inner diameter of the pipeline, so as to streamline the area for the sampling operation.
5. The method of claim 4 , wherein in step “b1” there is further provided the step of positioning said barrier utilizing a support.
6. The method of claim 1 , wherein said gas stream has a velocity, and wherein there is provided after step “a” the added step “a1” of dispersing entrained liquid in said pipeline into liquid droplets, while utilizing the velocity of said gas stream to suspend said droplets in said gas stream, so as to form a sample zone downstream therefrom.
7. The method of claim 6 , wherein in step “a1” said entrained liquid is dispersed into liquid droplets by utilizing a plurality of Helmholtz resonator cavities formed in an inner surface in contact with the flowing gas to create sonic energy such that liquid flowing thereover would disperse into droplets suspended by said gas stream.
8. An apparatus for sampling a gas stream having entrained liquid therein in a pipeline, comprising:
a housing having a length and a width, and an opening formed through the wall of said pipeline, so as to provide access to said gas stream having liquid entrained therein;
first and second aligned plates forming a collection area therebetween, said first and second plates supported by a first vertical support, said first and second aligned plates formed to selectively fit within said housing;
a container formed to slidingly envelope said first plate and engage said second plate so as to contain fluids situated between said first and second plates in said gas stream, so as to provide sample containment therebetween;
whereby, said container and said first and second plates are formed to be simultaneously repositionable from said fluid stream to said housing, while maintaining sample containment therein.
9. The apparatus of claim 8 , wherein there is further provided a barrier having the profile of the inner diameter of the pipeline, said barrier formed to selectively block the opening of said housing at said pipeline, so as to provide a streamlined flow.
10. The apparatus of claim 8 , wherein upstream said gas stream from said housing there is provided an apparatus for dispersing entrained liquid into liquid droplets suspended by said gas stream, so as to form a sample zone downstream, comprising:
a slope having an end engaging said inner wall of said pipeline, said slope having a plurality of Helmholtz resonator cavities formed thereon in contact with said gas stream so as to facilitate the creation of sonic energy such that liquid flowing thereover would disperse into droplets suspended by said gas stream.