Novel off-Gas Treatment Technology To Remove Volatile Organic Compounds with High Concentration

The triethylene glycol (TEG) was used to treat the off-gas stream containing 16 volatile organic compounds (VOCs) with high concentration (up to 15000 ppm) by experimental solvent absorption and ASPEN Plus computational simulation, respectively. This solvent absorption technology (SAT) not only purifies the off-gas but also recovers the VOCs. The effects of some typical operational parameters, including temperature, pressure, liquid loading rate, ratio of absorption liquid to gas flow rates, and absorption column height, on the absorption efficiency have been systematically investigated. Simulation results show that the optimal operational conditions are determined as 30 °C, 0.5 MPa (absolute), recycling TEG (with a purity of 99.9%) to a gas ratio of 4:1 by weight, and 8 theoretical stages. In addition, two stages of thermal coupling are applied minimizing the energy consumption of the off-gas absorption process, leading to a reduction of 89.77% in energy consumption. Laboratory experiments and field test...