Device for reducing concentration of liquid drops carried by gas fume in babble fluidization bed desulfurizing tower

Abstract

The invention discloses a device for reducing the concentration of liquid drops carried by gas fume in a babble fluidization bed desulfurizing tower, belonging to the technical field of flue gas desulfurization of heat-engine plants. In the babble fluidization bed desulfurizing tower, an original gas fume injection pipe is inserted into limestone slurry in the babble fluidization bed desulfurizing tower from the top of the babble fluidization bed desulfurizing tower; a plurality of injection holes are arranged on the circumferential surface of the injection pipe at a position on the middle lower part; a mesh is horizontally fixed on the injection pipe above the injection holes and the inner cavity wall of the babble fluidization bed desulfurizing tower between the injection holes and the liquid level of the limestone slurry; and a purified gas fume outlet is arranged on the side wall at the upper end of the babble fluidization bed desulfurizing tower. The device controls the quantity of the liquid drops carried by gas fume from the origin, and the existence of the mesh ensures that the gas fume can be uniformly distributed in the limestone solution, thereby reducing the quantity of the liquid drops formed by mechanical disruption and controlling the total quantity of the liquid drops formed by bubble breakage. The device ensures the gas fume and the limestone slurry to have sufficient contact and is beneficial to improving the desulfurizing efficiency, thus the stability of pressure in the desulfurizing tower is improved, and the safe operation of the desulfurizing system is further guaranteed.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization in thermal power plants, and in particular relates to a device for reducing the concentration of liquid droplets carried by flue gas in a bubbling bed desulfurization tower. Background technique [0002] Flue gas emitted from thermal power plants contains SO 2 , seriously pollute the environment. The increasingly stringent environmental regulations require that new thermal power generating units must be equipped with desulfurization systems. At present, the limestone-gypsum wet flue gas desulfurization system is most commonly used in thermal power generation enterprises. In the limestone-gypsum wet flue gas desulfurization system, the bubbling bed desulfurization tower is a common form of desulfurization tower. figure 1 The schematic diagram of the bubbling bed desulfurization system shown includes a booster fan 1 , a gas-gas heat exchanger 2 , a bubbling bed desulfurization tow...

AI Technical Summary

Problems solved by technology

However, there are: 1) When the particle size of the droplets is less than 20 microns, the droplets can directly pass through the blades of the demister with the flue gas, and the demisting efficiency is not high; 2) When the flow rate of the flue gas is greater than the critical flow rate of the demister, Secondary carryover occurs in the demister, large droplets hit the blades, splashing out many small droplets, the smoke scours the liquid film on the surface of the blades, rolls up and takes away the small droplets, and the demisting efficiency drops sharply; 3) Demister The fogger only removes the droplets that have been generated, and cannot reduce the generation of droplets at the source

Therefore, in the actual operation of the desulfurization system, the demisting effect of the demister is not ideal, and the simple use of the demister to reduce the droplet content in the flue gas cannot guarantee the safe and economical operation of the desulfurization system.

The operation practice of related desulfurization systems in domestic power plants shows that simply relying on the arrangement of demisters behind the bubbling bed desulfurization towers cannot effectively control the amount of liquid droplets carried by the flue gas

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