Desulfurization device with tower interior flue gas condensing function and water balance control method

Abstract

The invention relates to a desulfurization device with a tower interior flue gas condensing function and a water balance control method. The desulfurization device comprises a desulfurization tower, acooler, an entrance flue, an exit flue, a first slurry spraying pipe, a second slurry spraying pipe, a first slurry spraying pump, a second slurry spraying pump, a washing water tank, a washing pumpand a washing spraying pipe, wherein a demister is arranged in the desulfurization tower. A slurry filtering device is also additionally arranged and comprises a primary cyclone, a secondary cyclone and a backwashing filter. Slurry is taken out of the desulfurization tower and is treated by the slurry filtering device, then, clear liquid is used for washing the demister, and remaining concentratedliquor returns to the desulfurization tower. Under the condition that washing water volume of the demister is maintained unchanged, the clear liquid resulting from filtering is used for making up difference value between desulfurization water replenishing volume and washing water volume which is larger than the desulfurization water replenishing volume, and thus, the desulfurization device establishes a new water balance.

Description

technical field [0001] The invention relates to a desulfurization device with a flue gas condensation function in a tower and a water balance control method, which are mainly used in the dewhitening treatment process of coal-fired flue gas after wet desulfurization. Background technique [0002] In industries such as electric power, iron and steel, and coking, the coal-fired flue gas discharged from boilers adopts a wet desulfurization process. The flue gas after wet desulfurization treatment not only has a low temperature (about 50°C), but also has a high moisture content (water vapor is in a saturated state), and also carries a large amount of fine particles (PM2.5 and smaller particle sizes), After being discharged into the atmosphere, it is easy to form a high-humidity environment in local areas, which promotes the conversion of these fine particles into "smog". Therefore, wet desulfurization flue gas treatment has been listed by the government as the primary task of im...

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Problems solved by technology

[0004] Although the desulfurization device with the flue gas condensation function in the tower can reduce the moisture and pollutants in the flue gas, it has the following disadvantages: because the amount of water carried by the flue gas is reduced, the amount of water required in the desulfurization tower is also reduced, and only relying on water replenishment The amount of water used to clean the demister in the tower cannot meet the requirements of the normal cleaning amount; the reduction of the amount of cleaning water will result in unclean cleaning of the demister or even blockage by solid particles in the slurry. If the amount of cleaning water is not reduced, the slurry in the desulfurization tower will The liquid level continues to rise and cannot be controlled, and the desulfurization device cannot operate normally, that is, the water balance of the original wet desulfurization device is broken

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