Zero gas refiner CO2 concentration measurement device and CO2 concentration measurement system

Patent metadata

Field	Value
Publication number	US-9962647-B2
Application number	US-201514735965-A
Country	US
Kind code	B2
Filing date	Jun 10, 2015
Priority date	Jun 11, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

This invention provides a zero gas refiner for CO 2 concentration measurement device that can continuously refine a zero gas that is preferable for CO 2 concentration measurement. This invention adopts the zero gas refiner comprising a water adsorbent and a CO 2 adsorbent that desorb an adsorbed component and restore an adsorption ability by being heated to a predetermined restoration temperature, a refiner body that adsorbs water and CO 2 in an introduced sample gas or air in this order by the use of the water adsorbent and the CO 2 adsorbent housed inside of the refiner body so as to refine a zero gas and that leads out the zero gas, and a heating mechanism that applies heat to the refiner body at a time when the adsorption ability of the water adsorbent or the CO 2 adsorbent drops to an amount that is less than or equal to a predetermined amount.

First claim

What is claimed is:

1. A CO 2 concentration measurement system comprising:
a CO 2 concentration measurement device that has a measurement cell into which a sample gas containing CO 2 or a zero gas containing no CO 2 is introduced, and that measures a concentration of the CO 2 ; and
one or multiple zero gas refiners for the CO 2 concentration measurement device that refines the zero gas as being a reference of a measurement and supplies the measurement cell,
wherein each of the one or multiple zero gas refiners includes
a refiner body,
a water adsorbent and a CO 2 adsorbent, housed inside of the refiner body, that desorb an adsorbed component and restore an adsorption ability by being heated to a predetermined restoration temperature, and
a heating mechanism that applies heat to the refiner body at a time when the adsorption ability of the water adsorbent or the CO 2 adsorbent drops to an amount that is less than or equal to a predetermined amount,

wherein the refiner body is configured to introduce air into the water absorbent first and into the CO 2 adsorbent second, and
wherein the one or multiple zero gas refiners is connected to a zero gas flow channel that directs the zero gas refined by the one or multiple zero gas refiners to the measurement cell.

2. The CO 2 concentration measurement system described in claim 1 , wherein
the CO 2 adsorbent adsorbs CO 2 by making use of a molecular sieve action.

3. The CO 2 concentration measurement system described in claim 1 , wherein
a main component of the water adsorbent is silica gel, silica alumina, or activated alumina.

4. The CO 2 concentration measurement system described in claim 1 further comprising a drop judging part that makes a judgment that the adsorption ability of the water adsorbent or the CO 2 adsorbent drops to the amount that is less than or equal to the predetermined amount.

5. The CO 2 concentration measurement system described in claim 1 , wherein
the water adsorbent and the CO 2 adsorbent are separately housed in the refiner body, the heating mechanism is arranged in an area where the adsorbent whose restoration temperature is higher is housed and this adsorbent is heated directly by the heating mechanism, and the adsorbent whose restoration temperature is lower is heated by remaining heat.

6. The CO 2 concentration measurement system described in claim 1 , wherein
the sample gas and the zero gas discharged from the CO 2 concentration measurement device are introduced into the one or multiple zero gas refiners.

7. The CO 2 concentration measurement system described in claim 1 , wherein the one or multiple zero gas refiners are arranged in parallel, while the sample gas or the air is introduced into a first of the one or multiple zero gas refiners conducting an adsorption operation of water and CO 2 , and neither the sample gas nor the air is introduced into a second of the zero gas refiners conducting a restoration operation by being heated.

8. The CO 2 concentration measurement system described in claim 7 , wherein
a part of the zero gas discharged from the first of the one or multiple zero gas refiners is introduced into the second of the one or multiple zero gas refiners as a purge gas.

Assignees

• Horiba Ltd

Inventors

• Mizuno Yusuke
• Akiyama Shigeyuki
• Oka Tomomichi

Classifications

• G01N33/004

  CO or CO2 · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• Y02A50/244

  Cross-Sectional Technologies · mapped topic

• B01D2253/104

  Alumina · CPC title

• B01D53/261 Primary

  by adsorption · CPC title