Method for Early Detection of Carbonization During Drying of Organic Material

• US 20190331619A1
• Filed: 02/23/2018
• Published: 10/31/2019
• Est. Priority Date: 06/23/2017
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Choi, Yong Joon, Park, Won Chan, Song, Kyung Hyun
• Granted Patent: US 11,668,666 B2
• Time in Patent Office: Days
• CPC Class Codes: A62C 3/04 for dust or loosely-baled or loosely-piled materials, e.g. in silos, in chimneys flame traps A62C4/00
• CPC Class Codes: F26B 23/02 using combustion heating F26B3/305, F26B13/186, F26B21/001, F26B23/10 take precedence
• CPC Class Codes: F26B 3/02 by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air F26B3/283 and F26B3/343 take precedence
• CPC Class Codes: G01K 11/003 using absorption or generation of gas, e.g. hydrogen
• CPC Class Codes: G01N 25/482 concerning the temperature responsive elements measuring temperature or quantity of heat, thermally-sensitive elements G01K; thermoelectric devices H10N10/00, H10N15/00
• CPC Class Codes: G01N 33/0063 using a threshold to release an alarm or displaying means
• CPC Class Codes: G08B 17/117 by using a detection device for specific gases, e.g. combustion products, produced by the fire G08B17/103, G08B17/11 take precedence

Abstract

The present invention relates to a method for early detection of carbonization during the drying of an organic material. The method of the present invention measures temperature variation per unit time of exhaust gas containing water (H₂O), carbon monoxide (CO), or carbon dioxide (CO₂), which are to be generated by the pyrolysis of an organic material, and the concentration of carbon monoxide/carbon dioxide of the exhaust gas, so as to determine the occurrence of carbonization therethrough, thereby enabling early detection of carbonization within a dryer.

Claims

1. A method for the early detection of carbonization during a drying process of an organic material, comprising:

(1) hot-air drying the organic material in a dryer, wherein the hot-air drying produces an exhaust comprising one or more of water (H₂O), carbon monoxide (CO), and carbon dioxide (CO₂); and

at least one of;

(2) detecting a change in temperature per unit time of the exhaust;

or

(3) detecting a concentration of carbon monoxide in the exhaust;

or

(4) detecting a concentration of carbon dioxide in the exhaust,

determining that carbonization has occurred when the change in temperature per unit time of the exhaust is 0.5°

C./min or more, or when the concentration of carbon monoxide exceeds 2 ppm, or when a change in the concentration of carbon dioxide is 10% or more.

2. The method for the early detection of carbonization according to claim 1, wherein the organic material comprises a polymer particle having a diameter of 500 μ

m or less.

3. The method for the early detection of carbonization according to claim 2, wherein the polymer particle is at least one of acrylonitrile-butadiene-styrene (ABS), methyl methacrylate-butadiene-styrene (MBS), polyvinyl chloride (PVC) and high density polyethylene (HDPE).

4. The method for the early detection of carbonization according to claim 1, wherein the dryer is a fluidized bed dryer.

5. The method for the early detection of carbonization according to claim 1, wherein the method comprises at least two of:

(2) the detecting the change in temperature per unit time of the exhaust;

or

(3) the detecting the concentration of carbon monoxide in the exhaust;

or

(4) the detecting the concentration of carbon dioxide in the exhaust.

6. The method for the early detection of carbonization according to claim 1, further comprising determining that carbonization has occurred when the change in temperature per unit time of the exhaust is 0.5°

C./min or more and the concentration of carbon monoxide in the exhaust exceeds 2 ppm.

7. The method for the early detection of carbonization according to claim 1, further comprising determining that carbonization has occurred when the change in temperature per unit time of the exhaust is 0.5°

C./min or more and the change in concentration of carbon dioxide is 10% or more.

8. The method for the early detection of carbonization according to claim 1, further comprising determining that carbonization has occurred when the concentration of carbon monoxide in the exhaust exceeds 2 ppm and the change in concentration of carbon dioxide is 10% or more.

9. The method for the early detection of carbonization according to claim 1, further comprising determining that carbonization has occurred when the change in temperature per unit time of the exhaust is 0.5°

C./min or more, the concentration of carbon monoxide in the exhaust exceeds 2 ppm and the concentration of carbon dioxide in the exhaust increases by 10% or more.

10. The method of claim 1, further comprising activating a warning signal after determining that carbonization has occurred.