Venturi tube capable of changing sectional area and CFB absorbing tower thereof

Abstract

The invention discloses a Venturi tube capable of changing a sectional area and used in a CFB (circulating fluidized bed) absorbing tower. A transportable blunt body is arranged in the Venturi tube to change the sectional area of the Venturi tube. The transportable blunt body comprises a body of the blunt body, a blunt body wing plates and supporting poles; the blunt body wing plates are on external side of the body of the blunt body; the supporting poles are below the body of the blunt body and for supporting and promoting the transportable blunt body to move up and down and rotate. In addition, the invention also discloses a CFB absorbing tower with the Venturi tube structure. According to the invention, arranging the blunt body in the Venturi tube can keep a medium flowing in the Venturi tube at a high flow velocity during low flow. The invention can be applied to dry method flue gas desulphurization absorbing tower to guarantee stability of a circulating fluidized bed in the absorbing tower at a lower load and reduce low-load limit of a flue gas recirculating system.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and relates to a Venturi tube used in an absorption tower of a CFB (circulating fluidized bed) dry flue gas desulfurization process, in particular to a Venturi tube with a changeable cross-sectional area; It also relates to a CFB absorption tower having the above-mentioned variable cross-sectional venturi. Background technique: [0002] SO in the atmosphere 2 Acid rain formed by merging with precipitation will seriously endanger the health of residents, corrode building materials, destroy ecosystems, and cause huge economic losses. It has become an important environmental factor restricting the social and economic development of our country. Reducing the emission of sulfur dioxide, controlling sulfur dioxide pollution in the atmosphere, and protecting the quality of the atmospheric environment are one of the important issues of environmental protection in my country at present ...

AI Technical Summary

Problems solved by technology

[0003] There are many sulfur dioxide pollution control technologies, such as improving the energy structure and using clean fuels. However, flue gas desulfurization is an effective way to reduce SO 2 Emissions Irreplaceable Technology

[0005] However, the net flue gas recirculation system also brings two negative effects:

[0006] 1. The backflow of clean flue gas directly increases the load of the induced draft fan under low load, which increases the useless work done by the induced draft fan;

[0007] 2. The reflux of low-temperature clean flue gas will reduce the flue gas temperature at the entrance of the absorption tower, which will indirectly reduce the desulfurization efficiency of the absorption tower system

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