Removal Of Sulfur Dioxide Removal Agent From The Tail Gas Of Natural Gas Purification Plants

China is the sulfur dioxide major emitters and the sulfur dioxide emissions have exceeded the capacity of the environment. So far the global pay attention to the environmental problems. Especially China, enhance the emission standard of sulfur dioxide. The limit of sulfur dioxide emissions was 400 mg/m3 in the acid gas recovery unit of the "oil refining industrial pollutant discharge standard" (GB31570-2015) that has just released, even not higher than 100mg/m3 in special regions with fragile eco environment, capacity of atmospheric environment is smaller, high density and environmental bearing capacity. In the face of global environmental problems and the increasing strict standards of sulfur dioxide emissions. The situation that hard to hit target was faced by many natural gas purification plants. Therefore, the key of prevention and treatment of sulfur dioxide is to find a better desulfurizer desulfurization effect.Two kinds of treatment technologies are chosen in order to make the sulfur emission standards in the natural gas purification plant. hydrogenation reduction of SO2 in the tail gas into H2S, then use alcohol amine solution absorption, absorption of rich liquid desulfurizer, sulfur recovery system of H2S and its return unit production of sulfur, Another is oxidation process, will exhaust gas burning, let all into SO2, H2S for flue gas desulfurization, the production of sulfite. This paper is from the latter.Flue gas desulfurization system that simulate the natural gas purification plant was set up in the paper. The desulfurization rate, saturated sulfur capacity, regenerative effect and other indexes were chosen to evaluate polyethylene glycol dimethyl ether, propylene carbonate, N-methyl pyrrolidone, TEA+sodium sulfite, CuO+ammonium carbonate. Compared with each indexes, the polyethylene glycol dimethyl ether was chosen for further experimental parameters optimization test.The effect of catalyst, pH of solution, absorption temperature, packing height, solution concentration, liquid gas ratio and regeneration temperature on absorbent were investigated. Using single factor experiment, PB test and the response surface to obtain higher desulfurization rate plan was that Solution mass concentration 84%, liquid gas ratio 0.11, regeneration temperature 186.67?, solution pH=7, the filler height=30 cm, absorption temperature=40?, without catalyst. The predictive value of response surface method was 99.9662% and the experimental value was 99.8903%. The removal rate was 99.8213% that measured under the conditions of high concentration SO2. Combined with the actual construction situation to select regeneration temperature 140?, liquid gas ratio of 0.07 and the condition of solution concentration was 0.89. The desulfurization rate value of predicting model was 99.0965%, the experiment measured the desulfurization rate was 98.9937%, the error was smaller. And measured under the conditions of high concentration SO2 removal rate was 98.3156%.On the basis of optimization experiment, aimd at a natural gas purification plant, this article has carried on the preliminary design of NHD exhaust gas desulfurization technology, and calculate the process under the condition of total energy consumption is 9629.15W. NHD circulation volume of 84.58 m3/h, After desulfurization treatment SO2 concentration in tail gas is up to 49.97 mg/m3. To meet the current requirements of environmental protection.