Apparatus and method for promoting interaction of fine particles in coal-fired boiler flue gas

Abstract

The invention relates to a device and method for promoting interaction of fine particles in smoke of a coal-fired boiler.The device is characterized by comprising a rectangular channel, a shrinking and expanding throat, a turbulence clustering chamber and a smoke outlet, the rectangular channel serves as a smoke inlet, the shrinking and expanding throat comprises a gradually-shrinking part and a gradually-expanding part, the gradually-shrinking part is connected with the rectangular channel, the gradually-expanding part is connected with one end of the turbulence clustering chamber, and the smoke outlet is formed in the other end of the turbulence clustering chamber and connected with a subsequent dust removing device; a plurality of rectangular fins are arranged in the turbulence clustering chamber, every two rectangular fins form a set, n sets of fins are arranged, n is larger than or equal to 2, the two rectangular fins of each set are in a splay shape, the small opening end of the splay shape faces the smoke flow incoming direction, and the n sets of rectangular fins are sequentially arranged in the turbulence clustering chamber in the smoke flow incoming direction; an included angle ranging from 20 degrees to 60 degrees is formed between the rectangular fins and the smoke flow incoming direction, and the proportion of the length, in the width direction, of the turbulence clustering chamber to the diameter of the throat part of the shrinking and expanding throat is 6:5.

Description

technical field [0001] The invention relates to a technology for removing fine particles in coal-fired flue gas, in particular to a device and method for promoting the interaction of fine particles in coal-fired boiler flue gas. Background technique [0002] Inhalable particulate matter (PM 10 ) refers to fine particulate matter with an aerodynamic diameter less than or equal to 10 μm, especially the PM contained therein 2.5 It has caused serious atmospheric environmental problems, which has attracted great attention from our country. PM 2.5 The harm of fine particles is that the particle size is small, the specific surface area is large, and it is easy to absorb harmful substances such as viruses and bacteria. After entering the human body, they can form deposits in the alveoli, causing respiratory diseases and cardiopulmonary diseases, which are extremely harmful to the human body; at the same time, fine particles in the atmosphere The residence time is long and the tra...

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Problems solved by technology

[0004] At present, the main agglomeration technologies include sonic agglomeration technology, magnetic agglomeration technology, steam phase change agglomeration technology, electrocoagulation technology, chemical agglomeration technology and turbulent flow agglomeration technology, etc., but there are problems of varying degrees: the energy consumption of sonic agglomeration is too high, And it produces a lot of noise; both magnetic agglomeration technology and steam phase change agglomeration technology require fine particles to have corresponding physical characteristics; electrocoagulation technology mainly depends on factors such as particle concentration, particle size, charge distribution and electric field strength, and the agglomeration effect is relatively low. Well, however, due to the microcosmic nature and complexity of fine particles, it is still in the experimental research stage, and there are very few industrial applications; the chemical agglomeration technology needs to be configured with a specific acidity and concentration of agglomeration accelerators. Due to the preparation of chemical reagents and the adsorption of fine particles It is difficult to deal with harmful elements; relatively speaking, the turbulent agglomeration technology uses the vortex structure generated in the flue gas flow, particles of different particle sizes gather in different areas of the vortex, and particles with larger particle sizes flow at the vortex boundary due to inertia Or thrown out of the vortex, particles with smaller particle sizes are easily entrained in the center of the vortex, forming a larger concentration accumulation area, which increases the possibility of collision and interaction between particles of different particle sizes

Its disadvantage is that the use of "ten"-shaped parts increases the resistance of the flue, which is not conducive to the flow of flue gas. To reduce this defect will increase the volume of the equipment and increase the cost

Although the wavy vortex can reduce the resistance of the flow channel, the change of the fluid velocity gradient is small, and the vortex generation effect is poor, so that the agglomeration effect depends on the number of vortexes; at the same time, the vortex needs high machining accuracy, which increases the input cost of the equipment

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