CN-122006385-A - Flue gas purifying CPM device based on double spraying and condensation trapping and working method

CN122006385ACN 122006385 ACN122006385 ACN 122006385ACN-122006385-A

Abstract

The invention provides a flue gas purifying CPM device based on double spraying and condensation trapping and a working method thereof, comprising a tower body, wherein a lower spraying layer, a condensation trapping unit, an upper spraying layer and a demister are sequentially arranged in the tower body from bottom to top along the flue gas flow direction, the lower spraying layer is arranged above a flue gas inlet at the lower part of the tower body, the condensation trapping unit is arranged above the lower spraying layer, the condensation trapping unit comprises a first fluoroplastic heat exchange tube bundle layer, a supporting net and a second fluoroplastic heat exchange tube bundle layer which are sequentially arranged from top to bottom, each of the first fluoroplastic heat exchange tube bundle layer and the second fluoroplastic heat exchange tube bundle layer is composed of a plurality of fluoroplastic heat exchange tubes, and the fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer and the second fluoroplastic heat exchange tube bundle layer are mutually arranged in a set included angle in a horizontal plane. Solves the problems that the existing dust removal equipment has low trapping efficiency on the gaseous CPM, is difficult to release thermal stress and is not thoroughly cleaned.

Inventors

SI GUOLIANG
GUAN CHUANG
CAI GUODONG
YANG FENGLING
LIU YADONG
ZHANG DEJIE
WU HANGYU

Assignees

山东国舜建设集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (10)

1. A smoke purification CPM device based on double spraying and condensation trapping is characterized by comprising a tower body, wherein a lower spraying layer, a condensation trapping unit, an upper spraying layer and a demister are sequentially arranged in the tower body from bottom to top along the smoke flow direction, the lower spraying layer is arranged above a smoke inlet at the lower part of the tower body, the condensation trapping unit is arranged above the lower spraying layer, the condensation trapping unit comprises a supporting net, a first fluorine plastic heat exchange tube bundle layer and a second fluorine plastic heat exchange tube bundle layer, the supporting net is horizontally fixed on the inner wall of the tower body, the first fluorine plastic heat exchange tube bundle layer is arranged on the upper part of the supporting net, the second fluorine plastic heat exchange tube bundle layer is arranged on the lower part of the supporting net, the fluorine plastic heat exchange tube bundle layers of the first fluorine plastic heat exchange tube bundle layer and the second fluorine plastic heat exchange tube bundle layer are arranged at a set included angle in a horizontal plane, the upper layer is arranged above the condensation trapping unit, and the condensation trapping unit is arranged above the condensation trapping layer.
2. The smoke purifying CPM device based on double spraying and condensation trapping according to claim 1, wherein the demister is of a multi-layer gradient wire mesh structure, the multi-layer gradient wire mesh structure comprises at least two layers of wire meshes with different mesh numbers, which are sequentially arranged from bottom to top, and the mesh number of the lower layer of wire mesh is smaller than that of the upper layer of wire mesh, so that a gradient filtering structure from thick to thin is formed.
3. The smoke purifying CPM device based on double spraying and condensation trapping as claimed in claim 2, wherein the demister comprises three layers of wire mesh from bottom to top, wherein the first layer of wire mesh is 80-100 mesh wire mesh for intercepting large-size liquid drops and uniformly flowing air, the second layer of wire mesh is 120 mesh wire mesh for trapping medium-size mist drops, and the third layer of wire mesh is 150 mesh wire mesh for efficiently trapping tiny mist drops.
4. A smoke purifying CPM apparatus based on double spray and condensation trapping as claimed in claim 3, wherein said wire mesh is made of corrosion resistant stainless steel material, said corrosion resistant stainless steel material being 304 or 316L stainless steel.
5. The smoke purifying CPM apparatus based on double spraying and condensation trapping according to claim 1, wherein said supporting net is woven from corrosion-resistant metal material or from fluoroplastic coated metal composite wire, and the mesh diameter of said supporting net is larger than the outer diameter of fluoroplastic heat exchange tube.
6. The smoke purifying CPM device based on double spraying and condensation trapping according to claim 5, wherein the plurality of fluoroplastic heat exchange tubes of the first fluoroplastic heat exchange tube bundle layer are arranged in parallel with each other, and the plurality of fluoroplastic heat exchange tubes of the second fluoroplastic heat exchange tube bundle layer are arranged in parallel with each other.
7. The double spray and condensation trap based flue gas purifying CPM apparatus of claim 5, wherein the corrosion resistant metallic material is 316L stainless steel or titanium alloy.
8. The flue gas purifying CPM apparatus based on double spray and condensation trapping as claimed in claim 1, wherein said fluoroplastic heat exchange tubes of said first fluoroplastic heat exchange tube bundle layer and said second fluoroplastic heat exchange tube bundle layer have an included angle in the horizontal plane ranging from 60 ° to 90 °.
9. The smoke purifying CPM device based on double spraying and condensation trapping according to claim 1, further comprising a control unit connected to the upper spraying layer for controlling the intermittent opening of the upper spraying layer according to a preset time interval or a real-time monitored pressure difference or temperature of the condensation trapping unit.
10. A method of operating a double spray and condensation trap based flue gas purifying CPM device according to any of claims 1-9, comprising the steps of: Step one, enabling the flue gas to enter a tower body, and spraying by a lower spraying layer to enable the flue gas to reach a saturated or supersaturated state; Step two, saturated flue gas rises, sequentially passes through a first fluoroplastic heat exchange tube bundle layer, passes through a supporting net and then passes through a second fluoroplastic heat exchange tube bundle layer, and water vapor and gaseous CPM in the flue gas are condensed and condensed on the surface of a fluoroplastic heat exchange tube with the temperature lower than the dew point to form condensed liquid drops containing CPM; Step three, intermittently starting an upper spray layer through a control unit to spray cleaning liquid, wherein the cleaning liquid sequentially flushes the first-direction tube bundles, penetrates through a supporting net and is uniformly distributed to the second-direction tube bundles, and stripping and flushing away scale layers attached to the surfaces of the tube bundles; And fourthly, removing entrained liquid drops from the purified flue gas through a demister, and discharging the flue gas, wherein the demister adopts a multi-layer gradient wire mesh structure, and the number of the flue gas is gradually increased from bottom to top, so that gradient filtration from thick to thin is realized.

Description

Flue gas purifying CPM device based on double spraying and condensation trapping and working method Technical Field The invention belongs to the technical field of environmental protection flue gas treatment, and particularly relates to a flue gas purifying CPM device based on double spraying and condensation trapping and a working method thereof. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. After wet desulfurization, flue gas from coal-fired power plants and industrial boilers is usually in a saturated state, carrying a large amount of water vapor and Condensable Particulate Matter (CPM). Such CPM has become one of the important sources of PM2.5 after being vented to the atmosphere and meeting condensation. The condensation trapping technology enables CPM to be condensed at a low-temperature interface by reducing the temperature of flue gas, so that high-efficiency removal is realized. The existing dust removal equipment has extremely low trapping efficiency on gaseous CPM, CPM condensate is mixed with dust in flue gas in the condensation process, and a viscous scale layer is easily formed on the heat exchange surface, so that a conventional tubular heat exchanger is seriously scaled and blocked after long-term operation. The existing fixing limits the displacement of the tube bundle to a certain extent, so that the thermal stress is difficult to completely release, and meanwhile, the mesh of the positioning net is used for fixing, so that the thermal expansion sliding of the tube bundle is limited, and the stress concentration is easy to cause. In addition, in the multi-layer tube bundle structure of the existing dust removing equipment, the lower layer tube bundle is difficult to be sufficiently cleaned by spray water, when the demister is used for treating the flue gas with high moisture content, the treatment efficiency is insufficient, so that the chimney is watered, and the single-mesh silk screen is difficult to capture large liquid drops and tiny fog drops. Disclosure of Invention Aiming at the problems, the invention provides a flue gas purifying CPM device based on double spraying and condensation trapping and a working method thereof, which solve the problems that the existing dust removing equipment is low in trapping efficiency of gaseous CPM, and thermal stress is difficult to release and the cleaning is incomplete. In order to achieve the above object, the present invention is realized by the following technical scheme: The invention provides a flue gas purification CPM device based on double spraying and condensation trapping, which comprises a tower body, wherein a lower spraying layer, a condensation trapping unit, an upper spraying layer and a demister are sequentially arranged in the tower body from bottom to top along the flue gas flow direction, the lower spraying layer is arranged above a flue gas inlet at the lower part of the tower body, the condensation trapping unit is arranged above the lower spraying layer, the condensation trapping unit comprises a supporting net, a first fluorine plastic heat exchange tube bundle layer and a second fluorine plastic heat exchange tube bundle layer, the supporting net is horizontally fixed on the inner wall of the tower body, the first fluorine plastic heat exchange tube bundle layer is arranged on the upper part of the supporting net, the second fluorine plastic heat exchange tube bundle layer is arranged on the lower part of the supporting net, the first fluorine plastic heat exchange tube bundle layer and the second fluorine plastic heat exchange tube bundle layer are respectively formed by a plurality of fluorine plastic heat exchange tubes, the fluorine plastic heat exchange tube bundles of the first fluorine plastic heat exchange tube bundle layer and the second fluorine plastic heat exchange tube bundle layer are arranged at a set included angle in a horizontal plane, the upper spraying layer is arranged above the condensation trapping unit, and the condensation trapping unit is arranged above the condensation trapping layer. As a further implementation mode, the demister is of a multi-layer gradient wire mesh structure, the multi-layer gradient wire mesh structure comprises at least two layers of wire meshes with different mesh numbers, which are sequentially arranged from bottom to top, and the mesh number of the lower layer of wire mesh is smaller than that of the upper layer of wire mesh, so that a gradient filtering structure from thick to thin is formed. As a further implementation mode, the demister comprises three layers of wire mesh, wherein the first layer of wire mesh is 80-100 meshes of wire mesh and is used for intercepting large-size liquid drops and uniformly flowing air, the second layer of wire mesh is 120 meshes of wire mesh and is used for capturing medium-size fog drops, and the third layer of wire mesh i