Desulfurization and Purification Process of Acid Sewage Stripping Ammonia

Abstract

The invention provides a desulfuration purification process for acidic waste water steam stripping ammonia gas. Main equipment comprises two catalytic oxidation, adsorption and desulfuration purification towers capable of being connected in series or in parallel, the towers are filled with a desulfuration purifier capable of achieving thermal regeneration, and heat exchange tubes are arranged in a bed; the operating temperature ranges from 10 DEG C to 60 DEG C, H2S in the treated ammonia gas is smaller than or equal to 3 ug / g, SO2 in the treated ammonia gas is smaller than or equal to 3 ug / g, organic sulfur in the treated ammonia gas is smaller than or equal to 3 ug / g, and basically no phenol / quinine or cyanogen or hydrocarbon is contained; during thermal regeneration of the desulfuration purification towers, adsorbed and precipitated elemental sulfur is condensed into liquid sulfur to be recycled, and waste gas containing organic sulfur, phenol / quinine, cyanogen, hydrocarbon, NH3 and CO2 is merged into an H2S gas-rich pipeline at the top of a steam stripping tower, enters a sulfur recovery unit combustion furnace to be treated, or enters a torch pipeline to be burned up and exhausted.

Description

technical field [0001] The invention relates to an ammonia gas purification and purification process, in particular to a desulfurization and purification process for stripping ammonia gas from acidic sewage. Background technique [0002] Acidic sewage produced by refineries, coal chemical plants, coal coking plants, and coal-to-natural gas plants can be separated by stripping to obtain hydrogen sulfide and ammonia gas streams. [0003] The ammonia gas obtained by stripping and separating acidic sewage, such as the ammonia gas obtained by single-tower stripping and condensing acidic sewage, usually contains about 1% H 2 S, generally most of the H will be washed by the cycle washing method 2 S is washed into ammonia water and returned to the stripper for re-separation, or made into NH 4 HS crystallization products or solutions are sold, or directly lowered to low temperature without ammonia washing to form NH 4 HS crystallizes most of the H 2 S is removed; a small amount o...

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Problems solved by technology

[0004] In some acid sewage occasions, the main components of ammonia gas such as NH 3 About 98-99%, about 0.7% hydrogen sulfide, but it contains more organic sulfur, volatile phenols / quinones, cyanides, hydrocarbons, and more odorous components. After the above method, the obtained NH 4 HS crystals or solutions have color, odor, impurities, and purity problems, so their uses are limited or they cannot be sold or used; 2 And volatile phenols / quinones and cyanides have no purification effect or are not ideal, sometimes causing corrosion problems in ammonia subsequent processing equipment such as compressors, and the prepared ammonia water or liquid ammonia also has color and impurity problems; when the fine desulfurizer is regenerated The discharged waste gas containing organic sulfur, volatile phenols / quinones, and cyanides is usually sent to the torch for combustion and evacuation, and the torch has a general combustion effect on this kind of waste gas, and often has obvious odor and pollution

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