Dynamic reaction zone-based high-efficiency semi-dry desulfurization method

Abstract

The invention provides a dynamic reaction zone-based high-efficiency semi-dry desulfurization method. According to the dynamic reaction zone-based high-efficiency semi-dry desulfurization method, a desulfurizing tower, a bag-type dust collector, an induced draft fan are taken as the main equipment; a dynamic regulation mode is adopted in reaction zone design in the desulfurizing tower; and corresponding temperature, humidity, and circulating ash concentration adjusting is carried out in the reaction zone based on the situations of flue gas enters into a system. Flue gas, which contains pollutant SO2, dust, and NOx, and is to be processed, delivered through the desulfurizing tower and the bag-type dust collector successively, and system negative pressure operation is maintained via the induced draft fan so as to realize ultra low emission of SO2 and dust, and denitration efficiency ranges from 10 to 50%.

Description

technical field [0001] The invention relates to a semi-dry desulfurization process based on a dynamic reaction zone, which belongs to the field of environmental engineering. Background technique [0002] The "Twelfth Five-Year Plan" of the Ministry of Environmental Protection has formulated the total control target of sulfur dioxide. By 2015, the total amount of sulfur dioxide emissions will be reduced by 10% compared with 2010. This is a more serious task. For the current field of flue gas desulfurization treatment, since all kinds of wet desulfurization processes need to discharge a certain amount of waste water quantitatively to ensure the ion balance of the desulfurization system, the composition of the waste water to be discharged is extremely complex and the treatment is extremely difficult. The advanced desulfurization wastewater treatment process basically only treats the suspended solids and some heavy metal ions in the wastewater. There is no good solution for oth...

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Problems solved by technology

Although these processes can achieve high desulfurization efficiency through design optimization, the energy consumption of the system will be greatly increased. At the same time, due to the limitation of the semi-dry reaction principle, the mass transfer efficiency of these semi-dry processes is relatively low. Low, part of the desulfurization reaction occurs in the bag filter at the rear, which also has a certain impact on the service life of the filter bag

[0004] CN102631821A discloses a method for synergistic desulfurization of semi-dry method and wet method. Although deep desulfurization can be achieved, the application of spray forest for wet desulfurization increases the energy consumption of the system. At the same time, there is also the problem of wastewater discharge, and there is also a solvent emissions;

[0007] CN103566749A discloses a circulating fluidized bed semi-dry desulfurization system. Venturi tubes, ash storage hoppers and flue gas return devices are installed in the desulfurization tower, and the clean flue gas return circulation control loop is used to ensure the stability of the flow field in the desulfurization tower. , the bed layer is uniform, but dynamic real-time control cannot be realized only by controlling the pressure difference and other control cycles, and at the same time, the waste of energy consumption is huge and the cycle is long, which is not conducive to the adjustment of the desulfurization system;

[0009] CN102500225A discloses a desulfurization process. Although the desulfurization tower and the circulation process chamber have been improved, dynamic adjustment is not realized in the desulfurization tower, which is not conducive to real-time calculation and adjustment at any time, which consumes cost and time, and consumes too much energy

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