Venturi type desulfurizing device adopting spray drying method and desulfurizing method of desulfurizing device

Abstract

The invention relates to a venturi type desulfurizing device adopting a spray drying method and a desulfurizing method of the desulfurizing device. A vertical cylindrical tower-shaped structure is adopted, a venturi throat is arranged in the middle of a tower body, and flue gas enters a shell through an upper air inlet and passes through a desulfurizing tower from top to bottom. SO2 in the high-temperature flue gas and a reactant sprayed in through a nozzle are subjected to a chemical reaction, a reaction side product is solid Na2SO3 powder, most of the solid Na2SO3 powder falls into a lower ash bucket, and the rest of the solid Na2SO3 powder is discharged out of the tower body from a lower air outlet of the tower body along with the desulfurized flue gas, enters a subsequent dust removing process and is collected. The PH value of the solid desulfurizing side product is neutral or alkaline, no wastewater is generated in the whole desulfurizing process, and the temperature of the flue gas at an outlet of the desulfurizing tower is higher than the dew point temperature by 15 DEG C or above all the time. The problems that in a traditional desulfurizing technology, flue gas is not distributed uniformly in a flow field of a desulfurizing tower, full mixing of a desulfurizing agent and the flue gas is not uniform, mushroom heads and hair hanging are likely to be formed at a nozzle by a reactant and a reaction side product, and consequently running stability is influenced are solved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a venturi type spray drying method desulfurization device and a desulfurization method thereof. Background technique [0002] There are three main methods of flue gas desulfurization in industrial kilns: wet method, dry method and semi-dry method. The wet process technology is mature and the desulfurization efficiency is high, but the investment is large, the area is large, the energy consumption and operating costs are high, and waste water and residue are generated, the equipment needs to be considered anti-corrosion, and it is easy to scale; the dry process has low investment costs and desulfurization The product is in a dry state, the equipment is not easy to corrode, scale and blockage are not easy to occur, but the reaction speed is slow and the desulfurization efficiency is low; [0003] The semi-dry process is that the desulfurization agent ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of the uniform distribution of the flue gas flow field in the desulfurization tower, the uniformity of the sufficient mixing of the desulfurizer and the flue gas, and the easy flow of the reactants and reaction by-products at the nozzles in the traditional spray drying desulfurization technology. The generation of "mushroom heads" and "hanging whiskers" affects the stability of the operation, etc.

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