Treatment method and treatment device for FCC regeneration flue gas

• Main Authors: QIN LIJIAO, ZHOU TONG, DENG DEGANG
• Format: Patent
• Language: Chinese; English
• Published: 28.06.2019
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a treatment method and a treatment device for FCC regeneration flue gas. The treatment method comprises the following steps: carrying out split-flow treatment on propylene refining waste alkali liquor, acidifying part of the propylene refining waste alkali liquor in an acidifying treater, and carrying out a reaction on the acidified gas and the FCC regeneration flue gas ina desulfuration reactor to recover generated single element sulfur; adding solid sodium hydroxide into the residual propylene refining waste alkali liquor, wherein sodium bisulfide in the waste alkali liquor is fully converted into sodium sulfate, oxidizing NO in the desulfurated flue gas into NO2 to react with the waste alkali liquor, a liquid phase enters the acidifying treater and purified gasis discharged; and carrying out multiple-effect evaporation on the acidified waste liquor to recover sodium salt. The treatment method can remove SOx and NOx in the FCC regeneration flue gas effectively and remove sulfides in