Fluidization atomization-liquid film washing combined flue gas purifying device and method

Abstract

The invention discloses a fluidization atomization-liquid film washing combined flue gas purifying device. The device comprises a gas distribution screen located at a lower part and a liquid distribution screen located at an upper part, wherein the gas distribution mesh and the liquid distribution mesh are both provided with meshes; purifying liquid can be separated into fine liquid flows by the liquid distribution screen, falls into a fluidization atomization layer and passes through the gas distribution screen to leave the purifying device; and to-be-purified flue gas can uniformly enter the fluidization atomization layer through the gas distribution screen and then passes through the liquid distribution screen and a liquid film layer thereon to leave. The invention also discloses a method for removing dust in flue gas by using the device. A purifying liquid circulating pump of a purifying system matching with the device is greatly reduced in power consumption; and used equipment is simple in structure and easy to maintain.

Description

Technical field [0001] The present invention relates to the field of flue gas purification, in particular, the present invention relates to a flue gas purification device and method combining fluidized atomization and liquid film washing. Background technique [0002] Traditional flue gas purification technologies include centrifugal separation dust removal technology, electric dust removal technology, bag dust removal technology and wet flue gas purification technology. [0003] The equipment structure of centrifugal separation dust removal technology is simple, and the inertial separation effect can be improved by increasing the flue gas flow rate. However, due to the overall flow of the airflow, the large cross-sectional area of ​​the flow, the average stroke of the solid from the gas is long, and the airflow has a secondary effect on the separated dust particles Carrying influence, gas-solid separation is difficult to complete, not only the resistance is large, but also the dus...

AI Technical Summary

Problems solved by technology

The main disadvantages of the traditional spray desulfurization dust collector are: the spray water can only be fully atomized to ensure the efficiency of gas-liquid mass transfer, which requires special wear-resistant nozzles and high flow pressure drop, high power consumption and maintenance costs

Although the spray water and flue gas flow in opposite directions, since the water flow and the air flow are combined into streams with the least flow resistance and the flow routes are selected by themselves, the flow cross-sectional size of the average water stream and air stream is relatively large. Momentum transfer is small, the contact area and contact time per unit mass of smoke and water are small, and the mass transfer is poor

The main disadvantages of the traditional liquid film desulfurization dust collector are: the flow section of the flue gas passing through the liquid film is relatively large, the flue gas mostly passes through the water layer in the form of bubbling, and the contact area and contact time per unit mass of smoke and water are very small. Small

Although the use of a Venturi tube can also enhance the atomization of water and the mass transfer with flue gas, it is still difficult to achieve a high level of desulfurization and dust removal efficiency

As the capacity increases, the diameter of the Venturi tube increases, and the flue gas purification efficiency also decreases significantly.

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