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Composite humidifying process suitable for circulating fluid bed semi-drying method flue gas desulfurization

A circulating fluidized bed, semi-dry technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of desulfurization ash sticking to the wall, poor continuous operation stability, high Ca/S ratio, etc. The effect of running stability and improving utilization

Inactive Publication Date: 2007-11-28
SHANDONG UNIV
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Problems solved by technology

However, the CFB-FGD process still has common problems such as high Ca / S ratio, desulfurization ash sticking to the wall, poor continuous operation stability, and desulfurization agent utilization rate is only 50%~60%, which has become a bottleneck restricting its long-term development.

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  • Composite humidifying process suitable for circulating fluid bed semi-drying method flue gas desulfurization

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Embodiment Construction

[0012] A best embodiment of the present invention is given below in conjunction with accompanying drawing 1.

[0013] The flue gas enters from the bottom of the desulfurization tower 3, and in the gradual expansion section 1, it contacts the circulating ash that has been humidified by the external humidification system 5. At this time, due to the large amount of external humidification ash, the total evaporation area is also large, and the surface The rapid evaporation of water can create better conditions for the desulfurization reaction, and because the ash and water are evenly mixed, it is conducive to the rapid progress of the desulfurization reaction. At the same time, it also reduces the temperature of the smoke and increases the relative humidity, providing more favorable conditions for the subsequent desulfurization reaction. After the flue gas reaches the position of the water spray humidification system 2 in the tower, the temperature of the flue gas is lowered in adv...

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Abstract

The present invention is one composite humidifying process for semi-dry fume desulfurization in a circulating fluidized bed, and belongs to the field of industrial waste gas purifying, environment protecting and energy source technology. The composite humidifying process includes simultaneous inside-tower humidifying and outside-tower humidifying, the inside-tower humidifying is completed via spraying water directly through nozzle, and the outside-tower humidifying is to humidifying ash for the circulating process. The present invention has reasonably improved complex gas-liquid-solid reaction inside the desulfurizing tower, raised desulfurizing agent utilizing rate and raised running stability of the desulfurizing system.

Description

technical field [0001] The invention belongs to the fields of industrial waste gas purification, environmental protection and energy, and in particular relates to a composite humidification process for semi-dry circulating fluidized bed flue gas desulfurization suitable for flue gas purification. Background technique [0002] Flue gas desulfurization technology is a method widely used at home and abroad to control sulfur dioxide in coal-fired flue gas. The semi-dry circulating fluidized bed flue gas desulfurization process (CFB-FGD) is especially suitable for the desulfurization transformation of existing power plants burning medium and low sulfur coal due to its simple process, low investment and small land occupation. However, the CFB-FGD process still has common problems such as high Ca / S ratio, desulfurization ash sticking to the wall, poor continuous operation stability, and desulfurization agent utilization rate is only 50%~60%, which has become a bottleneck restrictin...

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/04
Inventor 马春元崔琳董勇郝晓文张立强
Owner SHANDONG UNIV
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