Device for preventing crystallization blockage of ammonia desulfurization tower

Abstract

The invention relates to a device for preventing crystallization blockage of an ammonia desulfurization tower. The bottom of the desulfurization tower is an absorption liquid section, and a condensation section, an absorption section, a water washing demisting section and a demister section are arranged above the absorption liquid section sequentially; a closed in-tower baffle plate is arranged between the absorption liquid section and the condensation section, a concentration gas rising plate is arranged between the condensation section and the absorption section, a water washing section gasrising plate is arranged between the absorption section and the water washing demisting section, and water washing demisting section filler and a water washing section spraying layer are arranged in the water washing demisting section; a demister for flushing spraying is arranged in the demister section, crystallization can be avoided on the spraying layer structure, accumulation of desulfurized ammonium salt evaporation crystals in the condensation section is reduced, and therefore, crystallization and material hanging at the position of the gas rising plates can be prevented, flue gas circulation is increased, crystallization and material hanging at the position of the gas rising plates are mainly prevented, crystals and hung materials are removed, cavity circulation of the gas rising plate is increased, running resistance in the tower is reduced by about 50 Pa, water balance of an absorption liquid system is improved, and the utilization rate of a circulating liquid is greatly increased and is increased by 90% or higher.

Description

technical field [0001] The invention relates to an ammonia desulfurization tower, in particular to a device for preventing crystallization blockage of the ammonia desulfurization tower, which belongs to the technical field of chemical industry. Background technique [0002] At present, the ammonia desulfurization process is usually used to reduce SO 2 my country has paid more and more attention to the research of flue gas desulfurization and denitrification technology. The ammonia desulfurization absorbent uses liquid ammonia or ammonia water, so that there will be no "three wastes": exhaust gas discharge up to standard, no waste water, waste residue discharge, desulfurization side effects The product is ammonium sulfate. [0003] Saturated crystallization in the tower is a main process scheme for the crystallization of by-products of the ammonia process. In the absorption tower, the heat of the imported flue gas is used to evaporate the water in the absorption liquid during...

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Problems solved by technology

[0005] 1. In the actual operation process, due to the evaporation of water in the saturated crystal concentration section in the tower, the crystallization is not complete after the solution reaches the saturated concentration, which causes the blockage of the air outlet of the bubble cover in the concentration section and increases the system resistance.

[0006] 2. The circulating fluid in the ammonia desulfurization concentration section is supplemented by the overflow of the absorption fluid, which makes the water balance difficult, resulting in the unbalance of the circulating fluid water in the washing section, absorption section, and concentration section. In order to maintain the water balance, the sulfur can only be partially discharged. It is difficult to recover ammonium solution and the reuse effect is poor

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