초록 ▼

A system includes a moisture analyzer configured to detect moisture in natural gas. The moisture analyzer includes an absorption cell that encloses and conducts the natural gas. The moisture analyzer also includes a pressure control device that may reduce a pressure of the natural gas inside the abs

A system includes a moisture analyzer configured to detect moisture in natural gas. The moisture analyzer includes an absorption cell that encloses and conducts the natural gas. The moisture analyzer also includes a pressure control device that may reduce a pressure of the natural gas inside the absorption cell. The moisture analyzer includes a light emitting device that may transmit light through the natural gas inside the absorption cell, as well as a photodetector that may detect an intensity of the light transmitted through the natural gas and exiting the absorption cell.

대표청구항 ▼

1. A system, comprising: a moisture analyzer configured to detect moisture comprising water present in natural gas, comprising: an absorption cell enclosing and conducting the natural gas;a pressure control device configured to reduce a pressure of the natural gas inside the absorption cell to gener

1. A system, comprising: a moisture analyzer configured to detect moisture comprising water present in natural gas, comprising: an absorption cell enclosing and conducting the natural gas;a pressure control device configured to reduce a pressure of the natural gas inside the absorption cell to generate de-pressurized natural gas at a pressure lower than an ambient pressure of the natural gas;a light emitting device configured to transmit light through the de-pressurized natural gas inside the absorption cell; anda photodetector configured to detect an intensity of the light transmitted through the de-pressurized natural gas and exiting the absorption cell. 2. The system of claim 1, comprising electronic circuitry configured to acquire and process a spectrum of the natural gas. 3. The system of claim 2, wherein the electronic circuitry is configured to determine a concentration of moisture in the natural gas based on the spectrum. 4. The system of claim 2, wherein the electronic circuitry is configured to subtract a background value from a spectral feature within the spectrum of the natural gas based on a predetermined ratio to determine a concentration of moisture in the natural gas. 5. The system of claim 2, wherein the spectrum comprises an absorption-based spectrum. 6. The system of claim 2, wherein the spectrum comprises a direct absorption spectrum. 7. The system of claim 2, wherein the spectrum comprises a derivative spectrum. 8. The system of claim 2, wherein the spectrum is based on photoacoustic spectroscopy. 9. The system of claim 2, wherein the spectrum is based on cavity ring down spectroscopy. 10. The system of claim 2, wherein the spectrum is based on fluorescence spectroscopy. 11. The system of claim 1, wherein the light emitting device comprises a laser, a diode laser, or a quantum cascade laser. 12. The system of claim 11, wherein the diode laser comprises: a thermoelectric cooler;a temperature sensor; anda built-in photodetector configured to detect an intensity of backward emission from the diode laser. 13. The system of claim 1, wherein the pressure control device comprises a vacuum pump or an aspirator. 14. The system of claim 1, wherein the pressure control device is configured to reduce the pressure of the natural gas to between approximately 1 psia and 5 psia. 15. The system of claim 1, wherein the natural gas comprises pipeline natural gas, liquified natural gas feed gas, or regasified liquefied natural gas. 16. The system of claim 1, wherein the absorption cell comprises a multipass absorption cell. 17. A method, comprising: reducing a pressure of natural gas by a pressure control device to generate de-pressurized natural gas at a pressure lower than an ambient pressure of the natural gas;transmitting a light through the de-pressurized natural gas at a pre-selected wavelength or across a wavelength range;recording a spectrum of the de-pressurized natural gas; anddetermining via electronic circuitry a concentration of moisture comprising water present in the natural gas based on the spectrum of the natural gas. 18. The method of claim 17, comprising reducing the pressure of the natural gas to generate de-pressurized natural gas at a pressure of no more than approximately 5 psi. 19. The method of claim 17, comprising reducing the pressure of the natural gas to generate de-pressurized natural gas at a pressure of no more than approximately 2.5 psi. 20. The method of claim 17, wherein the concentration of moisture is determined by subtracting a background value from a spectral feature within the spectrum of the de-pressurized natural gas based on a predetermined ratio.