METHOD OF PROCESSING VOLATILE ORGANIC COMPOUND AND SYSTEM FOR PROCESSING VOLATILE ORGANIC COMPOUND

Abstract

Discharge gas containing a volatile organic compound is supplied to an adsorption apparatus, and the volatile organic compound adsorbed in the adsorbent is then desorbed from the adsorbent by the use of steam and mixed it with the steam, and finally, the steam mixed with the volatile organic compound is supplied under a pressurized environment to a combustion apparatus to thereby combust it with fuel gas.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system structural view illustrating a characteristic configuration of a volatile organic compound processing system according to a first embodiment of the present invention.

FIG. 2 is a system structural view illustrating a characteristic configuration of a volatile organic compound processing system according to a second embodiment of the present invention.

FIGS. 3A to 3H are schematic views illustrating operating states “a” to “h” of an adsorption apparatus in the second embodiment of the present invention.

FIG. 4 is a timing chart illustrating a transition of operation of the adsorption apparatus in the second embodiment of the present invention.

FIG. 5 is a system structural view illustrating a characteristic configuration of a volatile organic compound processing system according to a third embodiment of the present invention.

FIG. 6 is a system structural view illustrating a characteristic configuration of a volatile organic compound processing system according to a fourth embodiment of the present invention.

FIG. 7 is a system structural view illustrating a characteristic configuration of a volatile organic compound processing system according to a fifth embodiment of the present invention.

Claims

1. A method of processing a volatile organic compound, comprising: adsorbing in an adsorbent a volatile organic compound contained in a gas to be treated;desorbing the volatile organic compound adsorbed in the adsorbent from the adsorbent by the use of steam and mixing it with the steam, under a pressurized environment; andcombusting the steam mixed with the volatile organic compound.

2. The method as recited in claim 1, wherein the steam is generated by the use of heat of combustion gas.

3. The method as recited in claim 1, wherein adsorption of the volatile organic compound with respect to the adsorbent, and desorption of the volatile organic compound from the adsorbent are alternately carried out in parallel.

4. The method as recited in claim 1, wherein some of the steam for desorbing the volatile organic compound from the adsorbent is supplied in a bypassing manner not to be supplied for desorption of the volatile organic compound.

5. The method as recited in claim 1, wherein a pre-process for concentrating the volatile organic compound is applied to the gas to be treated, and thereafter, the volatile organic compound is adsorbed in the adsorbent.

6. The method as recited in claim 5, wherein the pre-process comprises either one or both of (i) a concentration process in which the volatile organic compound contained in the gas to be treated is adsorbed in the adsorbent, and thereafter, the volatile organic compound is desorbed from the adsorbent by the use of hot gas to thereby be concentrated, and (ii) a dehumidifying process in which the water content is removed from the gas to be treated.

7. The method as recited in claim 1, wherein the volatile organic compound is adsorbed in the adsorbent, and thereafter, the volatile organic compound in the adsorbent is heated by the use of hot gas before it is desorbed by the use of steam.

8. The method as recited in claim 6, wherein the hot gas is discharge gas of combustion gas that has been supplied to generate steam.

9. The method as recited in claim 6, wherein the hot gas is air that has been heated by heat transfer with discharge gas of combustion gas that has been supplied to generate steam.

10. A processing system of a volatile organic compound, comprising: an adsorption apparatus which adsorbs in an adsorbent a volatile organic compound contained in gas to be treated, and desorbs the volatile organic compound adsorbed in the adsorbent from the adsorbent by the use of steam and mixing it with the steam, under a pressurized environment; anda combustion apparatus which combusts the steam mixed with the volatile organic compound.

11. The processing system as recited in claim 10, wherein the combustion apparatus comprises a steam generating apparatus that generates steam using heat of combustion gas.

12. The processing system as recited in claim 10, wherein the adsorption apparatus comprises a plurality of adsorption units, andwherein the processing system further comprises a switching apparatus which switches said plurality of adsorption units so that adsorption of the volatile organic compound in the adsorbent, and desorption of the volatile organic compound from the adsorbent are alternately carried out in parallel.

13. The processing system as recited in claim 10, further comprising: a steam bypass control valve which controls a flow of steam directly supplied to the combustion apparatus without being passed through the adsorption apparatus.

14. The processing system as recited in claim 10, further comprising: a pre-processing apparatus for concentrating a volatile organic compound contained in the gas to be treated, before adsorbing the volatile organic compound in the adsorbent.

15. The processing system as recited in claim 14, wherein the pre-processing apparatus comprises either one or both of (i) a concentrator where the volatile organic compound contained in the gas to be treated is adsorbed in the adsorbent, and thereafter, the volatile organic compound is desorbed from the adsorbent by the use of hot gas to thereby be concentrated, and (ii) a dehumidifier where the water content is removed from the gas to be treated.

16. The processing system as recited in claim 10, wherein the volatile organic compound in the adsorbent is heated by the use of hot gas before it is desorbed by the use of steam.

17. The processing system as recited in claim 15, wherein the hot gas is discharge gas of combustion gas supplied to generate steam.

18. The processing system as recited in claim 15, further comprising: a heating apparatus where air is heated by heat transfer with discharge gas of combustion gas supplied to generate steam, andwherein the hot gas is the heated air discharged from the heating apparatus.