Vertical eddy flow type circulating fluidization dry process stack gas desulfur method

Abstract

A dry-method fume-desulfurizing process using vertical eddy and circulated fluidizing features that the fume to be desulfurized is sprayed into desulfurizing tower from front and back of tower at different heights to generate the vertical eddy flow of fume in tower, which can carry the sprayed desulfurizing agent particles and atomized water drops to form a strong gas-solid-liquid eddy, resulting in strong desulfurizing reaction. Its advantages are high desulfurizing efficiency, and low cost.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, relates to dry desulfurization of flue gas exhausted by various combustion equipment, and specifically refers to a dry flue gas desulfurization method of vertical vortex circulation fluidization. Background technique [0002] The control of sulfur dioxide gas pollution in the flue gas exhausted by combustion equipment has always been the focus of environmental protection in most countries in the world. It is imperative. For the treatment of sulfur dioxide in flue gas, foreign countries usually use wet lime gypsum method (W-FGD) to desulfurize. A series of problems such as large size, complex structure, and the need to retreat water. Therefore, dry or semi-dry flue gas desulfurization technology has become the focus of research and development at home and abroad. [0003] For dry or semi-dry flue gas desulfurization technology, the main factors affecting ...

AI Technical Summary

Problems solved by technology

However, the dry flue gas desulfurization technology using this bottom circulation fluidization method still has the following defects: First, the total resistance of the flue gas circulation is relatively large, usually higher than 2000 Pa under normal operating conditions, which causes operating costs increase and increased equipment wear

Secondly, the bottom circulating fluidization method is difficult to consider the influence of factors such as the change in the load of the combustion equipment and the reduction of the flue gas volume, which may lead to the abnormal fluidization of the fluidized bed reaction system, and the load adjustment is poor.

In addition, with the increasing size of coal-fired power plant boilers, the section and height of the desulfurization tower increase, the internal flow field of the desulfurization tower with this bottom circulation fluidization method tends to be uniform, and it is difficult to ensure the collision between solid particles in the desulfurization tower And the contact between solid particles and flue gas, so that the mixing of flue gas and desulfurization agent particles is weakened, and even leads to the organization failure of flue gas and particle flow field, which affects the utilization rate and desulfurization efficiency of desulfurization agent

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