Waste gas recycling process and recovery device for packaging and printing industry

Patent Name Packaging and Printing Industry Waste Gas Recovery Process and Recovery Device Patent Applicant Li Guangqiu; Cao Jianzhong Principal Applicant Address 314400 Inventor Li Guangqiu, Room 603, Building 54, Unit 54, Furong Street, Haining City, Zhejiang Province, China Patent Application No. 200310109172.4 Date of Application 2003.12. 05 Certification Date Approval Notice No. 1546204 Audit Announcement Date 2004.11.17 Instruction CD-ROM D0446 Main Classification Number B01D53/04 Classification Number B01D53/04 Sub-item Original Application No. Priority Abstracts This invention discloses an exhaust gas recovery process for the packaging and printing industry. And its recovery device. The exhaust gas recovery process of the packaging printing industry of the present invention includes exhaust gas filtration, adsorption, desorption, separation and recovery; the recovery device of the present invention includes a condenser, a separator, a filter, an exhaust fan, a steam pipe, and two towers. The tower is equipped with activated carbon. The exhaust gas inlet of the tower is connected with the filter through the inlet pipeline. The net gas outlet of the tower is connected with the exhaust fan through the exhaust gas pipeline. The exhaust gas outlet of the tower is connected with the condenser through the gas outlet pipeline and is condensed. The device is connected to the separator. Sovereignty Item 1. An exhaust gas recovery process in the packaging and printing industry. The process steps are as follows: 1) Start the fan, open the exhaust gas flow pipe valve of the No. 1 tower pipe, and close the steam outlet pipe valve so that the exhaust gas flows through the filter. The filter is filtered to remove dust and impurities and flow into the No. 1 tower. The activated carbon in the No. 1 tower adsorbs the exhaust gas. The exhaust gas is purified after being adsorbed, and the purified exhaust gas is sent to the outdoor by the blower; 2) When the activated carbon in the No. 1 tower is saturated, the steam inlet valve is opened, and the exhaust gas flow pipe valve on the No. 1 tower pipe is closed, the steam outlet pipe valve is opened, and the exhaust gas flow pipe on the No. 2 tower pipeline is opened. The valve opens and the steam outlet valve closes, allowing the steam to flow into Tower 1; the filtered exhaust gas from the filter then flows into Tower 2. At this point, Tower 1 enters the desorption process and Tower 2 enters adsorption. Process; 3) The process of desorption of Tower 1 is as follows: As the steam hot gas flows from Tower 1, the adsorbate adsorbed on the activated carbon of Tower 1 is vaporized to remove it from the activated carbon. After taking off from activated carbon, The carbon is regenerated, and the vaporized adsorption stream is sent to the condenser for cooling. After cooling, the gaseous adsorbate is converted to liquid adsorption, finally flows into the separator, separates and recovers, completes the desorption process, and closes the steam inlet valve. 4) The adsorption process of the second tower is the same as that of the first tower. After the exhaust gas is filtered out of dust and impurities, it flows into the second tower. The activated carbon in the second tower adsorbs the exhaust gas. The exhaust gas is adsorbed. After purification, the purified exhaust gas is discharged to the outside by the blower; 5) After the activated carbon in the second tower is saturated, the steam inlet valve is opened, and the exhaust gas flow pipe valve on the second tower is closed. The steam outlet pipe valve opens, the exhaust gas flow pipe valve on the first tower pipe is opened, and the steam outlet pipe valve is closed, so that the steam flows into the second tower, and the filtered exhaust gas flows into the adsorption tower No. 1; The second tower enters the desorption process, and the first tower enters the adsorption process. The desorption process of the second tower is the same as the first tower.