High efficiency wet desulfuration and dust-removing device

Abstract

The efficient wet desulfurizing and dusting device especially for coal burning boiler in power plant has one vertical tower with inner tower in its center, tangent flue gas inlet pipe and flue gas outlet pipe, lime water and cinder output pipe, tangent chemical nozzle and water retaining ring. It features the inwards protruding ring set over the flue gas inlet pipe to make fluid passage turned first to tower center and then upwards, and one overflowing unit in the center of the tower to overflow downwards the showing chemical liquid. The present invention has high desulfurizing and dusing effect.

Description

technical field [0001] The invention relates to a physical and chemical purification device for waste gas, in particular to a desulfurization and dust removal device for boiler flue gas. Background technique [0002] Chinese patent 94210374.2 discloses a boiler flue gas desulfurization and dust removal device. Its equipment for desulfurization and dust removal is a swirl plate tower. The tray also includes a central liquid receiving plate, a short cylindrical cover tube, a set of guide vanes connected with the periphery of the liquid receiving plate and the inner side of the cover tube, and a tubular or tapered overflow device. This swirl plate tower also has the following disadvantages: 1) its flue gas inlet is arranged at the bottom of the tower, the flue gas outlet is arranged at the top of the tower, the liquid flow inlet is arranged at the top of the tower, and the liquid flow outlet is arranged at the bottom of the tower, so , its desulfurization and dust removal is c...

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Problems solved by technology

This swirl plate tower also has the following disadvantages: 1) its flue gas inlet is arranged at the bottom of the tower, the flue gas outlet is arranged at the top of the tower, the liquid flow inlet is arranged at the top of the tower, and the liquid flow outlet is arranged at the bottom of the tower, so , its desulfurization and dust removal is completed in the reverse flow contact between the downward liquid flow and the upward air flow. Because the liquid and gas in the reverse flow have a short contact time and a small contact probability, the effect of desulfurization and dust removal is not ideal; 2) Swirling flow The structure of the plate tower is complicated, there are many parts, and the requirements for installation are relatively strict, such as whether the swirl tray is horizontal or not, whether the installation of the guide vane is centered, whether the center liquid receiving plate and the short cylindrical shell are in the circumferential direction. Whether the distance between each point is uniform or not will directly affect the effect of desulfurization and dust removal, so it is relatively difficult and costly in terms of equipment manufacturing and installation; 3) Complete flue gas desulfurization in gas-liquid reverse flow It takes a lot of liquid medicine to remove dust, and the resistance drop when the fluid passes through the swirl tray is also relatively large, so the cost of equipment operation is relatively high; 4) the swirl tray is easily damaged, and its maintenance is time-consuming and expensive. Troublesome and has to be shut down for repairs

It improves the effect of flue gas desulfurization and dust removal by the flow of liquid and gas in the same direction, simplifies the structure of the equipment, reduces the consumption of liquid medicine and the resistance drop of fluid flow, but it also has the following disadvantages: 1) The The double-tower structure of the main tower and Venturi tower used in the device needs to occupy a large space, and the resistance drop of the fluid in the tower is also relatively large; 2) Its main tower is a straight circular cylindrical shape, and the smoke and liquid medicine After entering from the tangential opening of the tower wall, desulfurization and dust removal are carried out in the swirl layer. Because the fluid lacks radial cross mixing in the swirl layer, the desulfurization reaction is not thorough enough; 3) There is no liquid supplement in the central area of ​​the main tower , there is a significant lack of liquid medicine, and the mist concentrates in the center of the main tower when the fluid rotates. It rises with the air flow and is difficult to remove, so it will affect the further improvement of the desulfurization and dust removal effect and the dryness of the exhaust gas.

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