| abstract |
The invention discloses a low-concentration formaldehyde waste gas recovery and disposal device and a process, comprising the following steps: after the high-temperature waste gas containing formaldehyde is dedusted, a two-stage washing method is used to concentrate the formaldehyde solution generated by absorbing the formaldehyde, and the concentration tower adopts a dynamic wave washing method , through proper liquid-gas ratio and liquid circulation concentration, more than 30% formaldehyde aqueous solution is produced; then the formaldehyde and residual impurities in the waste gas are further removed by the washing tower, and finally discharged to the atmosphere after efficient demisting. The invention has simple process equipment, convenient operation, saves investment and land occupation, can realize the recovery and resource utilization of formaldehyde under normal temperature and normal pressure conditions, the formaldehyde recovery rate can reach more than 90%, and the application prospect is wide. |