US 10,981,204 B2
Method and system for thermal desorption treatment of organic-contaminated soil and treatment of desorbed waste gas
Senlin Tian, Kunming (CN); Jianhong Huang, Kunming (CN); Xiangliang Liu, Kunming (CN); Yingjie Li, Kunming (CN); Xuewei Hu, Kunming (CN); and Ping Ning, Kunming (CN)
Assigned to Kunming University Of Science And Technology, Yunnan (CN)
Filed by KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY, Kunming (CN)
Filed on May 22, 2019, as Appl. No. 16/419,767.
Claims priority of application No. 201810498207.4 (CN), filed on May 23, 2018.
Prior Publication US 2019/0358689 A1, Nov. 28, 2019
Int. Cl. B09C 1/00 (2006.01); B09C 1/08 (2006.01); B01D 53/14 (2006.01); B01D 53/18 (2006.01); B09C 1/06 (2006.01)
CPC B09C 1/08 (2013.01) [B01D 53/1487 (2013.01); B01D 53/1493 (2013.01); B01D 53/18 (2013.01); B09C 1/06 (2013.01); B01D 2252/205 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for thermal desorption treatment of organic-contaminated soil and treatment of desorbed waste gas, comprising the following specific steps:
step 1 of thermal incineration: mixing fuel and combustion-supporting gas and performing thermal incineration to generate high temperature flue gas of 800-1500° C.;
step 2 of flue gas temperature regulation: mixing the high temperature flue gas generated in step 1 with normal temperature gas to obtain thermally-desorbed flue gas, and adjusting the temperature of the thermally-desorbed flue gas to 120-820° C. by changing the ratio of the high temperature flue gas to the normal temperature gas;
step 3 of thermal desorption: subjecting the thermally-desorbed flue gas obtained after the temperature regulation in step 2 to reverse contact with organic-contaminated soil for 5-25 min, and desorbing organic pollutants under high temperature and entering into desorbed flue gas, to form desorbed waste gas containing the organic pollutants and thermally-desorbed soil;
step 4 of dedusting: dedusting the desorbed waste gas containing the organic pollutants obtained in step 3, to generate dedusted waste gas containing the organic pollutants;
step 5 of heat exchange: performing indirect heat exchange between the dedusted waste gas containing the organic pollutants in step 4 and the combustion-supporting gas to lower the temperature of the dedusted waste gas containing the organic pollutants and increase the temperature of the combustion-supporting gas, separating moisture from the dedusted waste gas containing the organic pollutants in the form of condensed water, and feeding the heated combustion-supporting gas to step 1;
step 6 of absorption and purification: subjecting the dedusted waste gas containing the organic pollutants treated in step 5 to countercurrent contact with fresh fuel, and absorbing and purifying the organic pollutants in the waste gas by the fuel; and feeding the fuel containing the organic pollutants back to step 1 for thermal incineration; and
step 7 of soil cooling: cooling the thermally-desorbed soil in step 3, and then humidifying the soil with the condensed water obtained in step 5 and discharging the soil.