Gas analysis apparatus and gas analysis method

Patent metadata

Field	Value
Publication number	US-11327047-B2
Application number	US-201916536707-A
Country	US
Kind code	B2
Filing date	Aug 9, 2019
Priority date	Aug 17, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

The present invention includes a first flow path through which a sample gas flows, a first analyzer that is provided in the first flow path to measure total hydrocarbon concentration in the sample gas, a second flow path through which the sample gas flows, a non-methane non-ethane cutter that is provided in the second flow path to remove the hydrocarbon components other than the methane and the ethane in the sample gas, a second analyzer that is provided downstream of the non-methane non-ethane cutter in the second flow path to measure the total methane ethane concentration of the methane and the ethane in the sample gas, and a calculation part that calculates the concentration of the hydrocarbon components other than the methane and the ethane in the sample gas with use of the total hydrocarbon concentration by the first analyzer and the total methane ethane concentration by the second analyzer.

First claim

The invention claimed is:

1. A gas analysis apparatus comprising:
a first flow path through which sample gas flows;
a first analyzer that is provided in the first flow path to measure total hydrocarbon concentration in the sample gas;
a second flow path through which the sample gas flows;
a non-methane non-ethane cutter that is provided in the second flow path to remove hydrocarbon components other than methane and ethane in the sample gas;
a second analyzer that is provided downstream of the non-methane non-ethane cutter in the second flow path to measure total methane ethane concentration of the methane and the ethane in the sample gas; and
a calculation part that calculates concentration of the hydrocarbon components other than the methane and the ethane in the sample gas with use of the total hydrocarbon concentration by the first analyzer and the total methane ethane concentration by the second analyzer.

2. The gas analysis apparatus according to claim 1 , wherein
the second analyzer is calibrated with ethane used and passed through the non-methane non-ethane cutter.

3. The gas analysis apparatus according to claim 1 , wherein
the calculation part calculates the concentration of the hydrocarbon components other than the methane and the ethane in the sample gas with use of the total hydrocarbon concentration by the first analyzer, the total methane ethane concentration by the second analyzer, and specific organic matter penetrability that is a ratio at which specific organic matter having a carbon number of 3 or more passes through the non-methane non-ethane cutter.

4. The gas analysis apparatus according to claim 1 , wherein
the calculation part calculates the concentration of the hydrocarbon components other than the methane and the ethane in the sample gas in accordance with an expression below:

[

Expression
⁢

⁢
4

]

x
NMNEHC

=

x

TCH
⁡

[

THC
-
FID

]

-

x

THC
⁡

[

NMNEC
-
FID

]

1
-

PF

C
3

⁢

H
8

⁡

[

HMNEC
-
FID

]

x NMNEHC : the concentration of the hydrocarbon components other than the methane and the ethane in the sample gas
x THC[THC-FID] : the total hydrocarbon concentration by the first analyzer
x THC[NMNEC-FID] : the total methane ethane concentration by the second analyzer
PF C3H8[THC-FID] : the specific organic matter penetrability that is a ratio at which the specific organic matter having a carbon number of 3 or more passes through the non-methane non-ethane cutter.

5. The gas analysis apparatus according to claim 1 , wherein
the second flow path is provided with a heating part that increases temperature of the non-methane non-ethane cutter to 200 to 250° C.

6. The gas analysis apparatus according to claim 1 , further comprising:
a first flow rate regulating mechanism provided in the first flow path; and
a second flow rate regulating mechanism provided in the second flow path, wherein
the first flow rate regulating mechanism and the second flow rate regulating mechanism match response timing between the first analyzer and the second analyzer.

7. The gas analysis apparatus according to claim 1 , further comprising:
a third flow path through which the sample gas flows;
a non-methane cutter that is provided in the third flow path to remove hydrocarbon components other than the methane in the sample gas; and
a third analyzer that is provided downstream of the non-methane cutter in the third flow path to measure methane concentration in the sample gas.

8. The gas analysis apparatus according to claim 7 , wherein
the calculation part calculates concentration of the hydrocarbon components other than the methane in the sample gas with use of the total hydrocarbon concentration by the first analyzer and the methane concentration by the third analyzer.

9. The gas analysis apparatus according to claim 7 , wherein
the calculation part calculates ethane concentration in the sample gas with use of the total methane ethane concentration by the second analyzer and the methane concentration by the third analyzer.

10. The gas analysis apparatus according to claim 7 , wherein
the third flow path is provided with a heating part that increases temperature of the non-methane cutter to 300° C. or more.

11. The gas analysis apparatus according to claim 10 , further comprising
a third flow rate regulating mechanism provided in the third flow path, wherein
the first flow rate regulating mechanism, the second flow rate regulating mechanism, and the third flow rate regulating mechanism match response timing among the first analyzer, the second analyzer, and the third analyzer.

12. A gas analysis apparatus calibration method for the gas analysis apparatus according to claim 1 ,
the gas analysis apparatus calibration method calibrating the second analyzer with ethane used and passed through the non-me

Assignees

• Horiba Ltd

Inventors

• Ochiai Ryota
• Yoshimura Tomoshi
• Lacdan Ma Camille Corrales

Classifications

• G01N33/0014 Primary

  by eliminating a gas (by a chemical reaction G01N33/0013; a chemical reaction taking place or a gas being eliminated in one or more analysing channels G01N33/0024) · CPC title

• G01N30/84

  Preparation of the fraction to be distributed · CPC title

• G01N1/4044

  by chemical techniques; Digestion; Chemical decomposition · CPC title

• G01N27/626 Primary

  using heat to ionise a gas · CPC title

• G01N2030/8405

  using pyrolysis · CPC title