Multi-stage spiral-flow type dust and mist removal device for realizing full-particle-size removal, and dust and mist removal method

Abstract

The invention discloses a multistage spiral-flow type dust and mist removal device for realizing full-particle-size removal and a dust and mist removal method. The multistage spiral-flow type dust andmist removal device for realizing full-particle-size removal comprises: a flow passing cylinder of a thin-wall cylinder structure; at least on flow gathering device, wherein each flow gathering device at least comprises a first-stage flow gathering ring and a second-stage flow gathering ring, the bodies of the two stages of flow gathering rings are both of a cylinder structure, internal channelsof the two stages of flow gathering rings are both in a circular truncated cone shape, and the second-stage flow gathering ring is arranged in the first-stage flow gathering ring in a sleeved mode; and at least one swirler, which is mounted on the cross section of the flow passing barrel, and the flow gathering device is correspondingly mounted at a downstream position relative to the swirler. According to the dust and mist removal device, through capture of at least two stages of liquid drops and smoke dust, the liquid drops and the smoke dust which are distributed in a large particle size range on the cross section of the flow passing barrel can be well captured, and a good dust and mist removal effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification equipment, and in particular relates to a multi-stage cyclone dust and mist removal device and a dust and mist removal method for full particle size removal. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily regarded as an acknowledgment or in any form to imply that the information constitutes the prior art already known to those skilled in the art. [0003] At present, the ultra-low emission and high-efficiency mist eliminators of many limestone-gypsum desulfurization processes in coal-fired power plants use tube-bundle dust and mist removal devices. A deep dust and mist removal device disclosed in the prior art has a core component of 3 The turbulent element is composed of a plurality of conventional swirl blades arranged accordi...

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Problems solved by technology

[0003] At present, the ultra-low emission and high-efficiency mist eliminators of many limestone-gypsum desulfurization processes in coal-fired power plants use tube-bundle dust and mist removal devices. A deep dust and mist removal device disclosed in the prior art has a core component of 3 The turbulent element is composed of a plurality of conventional swirl blades arranged according to a certain inclination angle. When the flue gas passes through the swirl blades according to the design flow rate, the liquid droplets with larger particle sizes in the flue gas will flow under the action of inertial force. It is thrown to the wall of the cylinder and collected, forming a stable liquid film on the wall of the cylinder. The liquid film flows into the absorption tower through the gap between the turbulent and the wall of the inner cylinder, so as to achieve the purpose of dust removal and fog removal, but this kind of dust removal The demisting device can only remove droplets with large particle size (larger inertial force), while small particle size droplets cannot be effectively captured by inertial force due to their small inertia and strong flue gas followability

When the removal efficiency is increased by increasing the flue gas flow rate, due to the increase of the droplet velocity, it is easy to tear the stable liquid film on the inner wall of the dust and mist removal device, and then cause a large number of liquid droplets to return to the flue gas. Secondary entrainment is formed, causing the concentration of smoke and dust at the outlet of the coal-fired unit to rise or even exceed the standard

[0004] In addition, because there is a gap between the turbulent element and the wall of the inner cylinder, the flue gas is short-circuited, and the flue gas is easy to escape due to the high flow rate of the flue gas.

Due to its design deficiency, this type of dust and mist removal device cannot deeply remove the liquid droplets within the full particle size range in the coal-fired flue gas, and the efficiency of dust and mist removal is not high, which hinders its use in coal-fired units for dust and mist removal. Further applications in the field of

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