CN113797690B - Cascading membrane descending column and device for cross-flow dust removal - Google Patents
Cascading membrane descending column and device for cross-flow dust removal Download PDFInfo
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- CN113797690B CN113797690B CN202111163867.5A CN202111163867A CN113797690B CN 113797690 B CN113797690 B CN 113797690B CN 202111163867 A CN202111163867 A CN 202111163867A CN 113797690 B CN113797690 B CN 113797690B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
- B01D47/022—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath by using a liquid curtain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
- B01D45/10—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators which are wetted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
- B01D47/024—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath by impinging the gas to be cleaned essentially in a perpendicular direction onto the liquid surface
Abstract
The invention discloses a cascade membrane-reducing column and a device for cross-flow dust removal. The film falling column comprises a column body, wherein a groove body capable of arranging a liquid film is formed in the column body; the groove body comprises a first groove body and a second groove body, the first groove body is arranged in the windward area, and the second groove body is arranged in the side wind area. The device is composed of the membrane descending columns which are arranged in a cascade mode. Compared with the prior art, the invention realizes that not only an inertial collision mechanism but also a Brownian motion mechanism exists in the falling film column falling film dedusting process. The brownian motion mechanism is characterized in that small particles impact a capturing surface due to the random brownian motion of the small particles on the side wind surface of the streaming flow so as to be captured. According to the invention, through the side wind surface film distribution, the dust removal effect brought by the brownian motion and inertial collision dust removal mechanism is effectively utilized, and the particle removal rate is improved; the energy consumption is effectively reduced through a falling film column cascading arrangement mode. And the size of the slotting angle is changed according to the air speed, so that excessive liquid film arrangement is avoided.
Description
Technical Field
The invention relates to the technical field of dust removal, in particular to a cascade membrane-reducing column and a device for cross-flow dust removal.
Background
Environmental problems caused by dispersion of aerosol in air bring influence to people which is difficult to eliminate, and research on aerosol removal is receiving more and more attention and research. The origin of the dust is that the particles in the tail gas discharged in industrial production are one of important sources, and how to realize higher dust removal efficiency with lower energy consumption cost is a great problem for technical personnel in the field of dust removal.
Common aerosol removal methods include mechanical, filtration, wet, and electrostatic precipitation. However, although these conventional dust removing methods have high dust removing efficiency, the huge energy consumption is not acceptable.
A Gas-liquid cross-flow dust removal array (GLCA) is a novel wet dust remover mainly based on a traditional dust removal mechanism, and has the technical advantages of self cleaning, pressure reduction, no entrainment and the like. In the optimized design of the liquid column of the GLCA system, the purpose of reducing the operation energy consumption by reducing the circulating water quantity is mainly considered. Considering that the GLCA dust removal system mainly depends on the surface of a liquid column to capture particles, Yangye et al replace the liquid column with a falling film on the outer surface of a rigid circular tube in the economic analysis of gas-liquid cross-flow dust remover technology (J, phosphatic fertilizer and compound fertilizer 2017,32(3): 44-48), so that the higher gas-liquid contact specific surface area of the system is maintained, and the circulating water quantity is greatly reduced. In the economic analysis of the non-uniform falling film type gas-liquid cross-flow dust removal system (J. chemical engineering and equipment 2019,268(5):283 and 287.) of the Chidona et al, the falling film mode has poor stability under the action of transverse wind, so that the normal operation gas velocity range of the system is narrow.
After determining that the existing main defects of the GLCA dust removal system are a series of problems of overlarge equipment volume, overlow operation energy consumption and the like caused by overlow unit exhaust removal efficiency and overlow equipment gas velocity, the project group of the Yuanhi optimizes the system in two main directions of trying to introduce a new dust removal mechanism and reducing circulating water quantity. Experiments prove that the promoting effects of thermophoresis effect, diffusion electrophoresis effect, particle condensation growth and agglomeration growth on the particle removal efficiency only exist in the front row of the system, so that the promoting effect is limited. Although the circulating water amount can be effectively reduced by the mode of falling film outside the pipe and falling film inside the groove, the unit discharge removal efficiency and the equipment gas velocity cannot be improved, and larger equipment volume is still needed for completing the treatment task, and the effect is still not ideal. The carding GLCA dust removal mechanism discovers that the strengthening of the inertial collision mechanism to improve the gas velocity and the removal efficiency is a feasible direction.
Therefore, the Yuanhi, Liu Yang Kun and the like make further improvements on energy consumption and removal efficiency, for example, the Chinese invention patent is a non-uniform film falling column, unit and device (patent number 201910941940.3) applied to falling film dust removal, and focuses on the research on how to distribute films to reduce energy consumption and collision mechanism to improve removal efficiency. However, this solution still leaves room for improvement in removal efficiency, especially for the removal of small particles.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims at overcoming the defects and shortcomings of the prior art, solves the technical problems that the removal efficiency of a cross-flow dust removal device is still insufficient, and particularly the prior art is not sufficient in understanding the removal of small particles, and provides a membrane reduction column for cross-flow dust removal.
The invention further aims to solve the technical problem of high energy consumption of the falling film column cascading arrangement device in the prior art, and provide the falling film column cascading arrangement dust removal device by further optimizing the falling film column cascading arrangement mode.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the falling film column for cross fluid dust removal comprises a column body, wherein a groove body capable of arranging a liquid film is formed in the column body, the groove body comprises a first groove body and a second groove body, the first groove body is arranged in a windward area and used for removing large particles which do inertial motion along with dust-containing gas, and the second groove body is arranged in a side wind area and used for removing small particles which do Brownian motion in the dust-containing gas.
The parameter setting of the windward area and the crosswind area of the invention is related to the operation energy consumption of the liquid path and the stability of the liquid film, and the specific design is as follows:
when the shape and size of the opening of the distribution plate are the same as the shape and size of the outer edge of the falling film column, the liquid leakage area is matched with the cross section of the falling film tank, the outer surface of a liquid film at an inlet of the distribution plate is basically the same as the outer edge surface of a current-limiting tank, the flow velocity of the liquid film is slowly increased under the action of gravity, the film thickness is slightly reduced, the fluctuation of the liquid film is slowly increased, when the liquid falls to a certain height, the gravity borne by the liquid in the film is balanced with the shearing force of the wall surface to the liquid, the flow velocity is kept unchanged, and the thickness of the liquid film is not changed any more, the falling height adopted by the invention is the length of the falling film column, and the flow sectional area of a fluid can be solved by the following formula:
in the formula Qml0Is the liquid mass flow of a single falling film column, kg.s-1；uAIs the average flow velocity of the liquid in the liquid film, m.s-1；AlIs a cross-sectional area of liquid flow, m2。
The average velocity in the liquid film can be solved by the following formula:
wherein g is the acceleration of gravity, m.s2(ii) a Delta is the thickness of the liquid film, m; ρ is a unit of a gradientlIs liquid density, kg.m3；μlLiquid viscosity, pas. When the mass flow of a single falling film column is known, the average flow velocity of the liquid film and the maximum flow velocity in the film when the liquid film vertically flows downwards can be obtained through the formula. If the thickness of the liquid film in the time slot is the same when the falling film flows, the water consumption is in direct proportion to the slotting angle of the side wind face under the working condition of a single falling film column because the slotting angle of the windward side is fixed, as shown in the following formula:
and analyzing and calculating the lowest operation energy consumption of the film falling columns with different side wind surface slotting angles, wherein the gas phase energy consumption is gas phase fluid conveying pressure drop, and the liquid phase energy consumption is circulating water conveying energy consumption. When the slotting angle range of the side wind surface is known, the water consumption under the working condition of a single film column can be solved and calculated through the formula (3), and the operation energy consumption can be solved through the following formula:
aQvl＝Qvl0nall (5)
Hm＝az0 (6)
wl＝HmQvlρlg (7)
wherein A is a gas phase flow cross-sectional area, m2；h1Is the effective falling film height of the falling film column, m; n is a radical of an alkyl radicalallThe total number of non-uniform falling film columns is required when the dust removal tower reaches 80% mass removal rate under different slotting angles and cascading modes of the device; a is the number of device layers; qvlAmount of circulating water required for a single layer of the device, m3·s-1；Qvl0Water consumption for single non-uniform falling film column, m3·s-1；HmM is the total height of the device; w is alThe lowest energy consumption for conveying the liquid phase is W. For the gas phase transportation pressure drop, because the gas phase flow rate is low, the energy consumption caused by dynamic wind pressure can be ignored, so the minimum transportation energy consumption can be solved by the following formula:
wg＝ΔpgQvg (8)
in the formula wgThe lowest energy consumption for conveying the gas phase, W; Δ pgThe total pressure drop of the gas path is Pa; qvgFor the gas processing amount under the operation task, m3·s-1。
Preferably, the bottom of the second tank body is in a shape of a straight line, a convex surface, a concave surface or a wave, and is used for increasing the collision probability or the adsorption/binding force of the small particles with the second tank body.
Preferably, the second chutes are arranged on both sides of the crosswind area, or are arranged only on one side, or are arranged at intervals along the periphery of the column body, so as to increase the effective area for capturing small particles.
Preferably, the length of the bottom edge of the second groove body is 2-12 mm; the grooving angle of the second groove body is 30-150 degrees, the groove width is 1.5-11 mm, and the groove depth is 0.3-5.4 mm; the length of the falling film column is 200-500 mm.
The cascade arrangement falling film column dust removal device comprises falling film columns which are arranged from sparse to dense in sequence in the flowing direction of dust-containing gas, and is used for improving the removal rate of dust-containing gas particles and effectively preventing blockage when high-concentration dust-containing gas is treated by fully utilizing the Brownian motion and inertial collision dust removal mechanism.
Preferably, the size of the second trough body close to the outflow side is smaller than that of the second trough body close to the inflow side, and the energy consumption for arranging the liquid film on the trough bodies is reduced through reasonable arrangement of the trough body sizes.
Preferably, the cascaded array unit is composed of a plurality of unit rows CnAnd (4) forming. One unit row comprises 1 to a plurality of film falling column rows; the falling film columns in the unit rows are arranged in a triangular staggered mode, the transverse spacing and the longitudinal spacing of the falling film columns are the same and are WnThe value is 2 mm-10 mm; two adjacent unit rows Cn、Cn+1Inner liquid column spacing difference Wn-Wn+1The value is constant and is 0.1-1 mm; liquid column spacing WnNarrowing from the airflow inlet to the airflow outlet, and two adjacent unit rows CnAnd Cn+1A distance L therebetweennIs equal to WnThe value is 2 mm-10 mm; the flow cross section area of the dust-containing gas is reduced by continuously shrinking the space between the falling film columns so as to increase the gas velocity, thereby achieving the effect of increasing the particle removal rate while controlling the energy consumption of the gas path.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a falling film column for cross fluid dust removal, which comprises a column body, wherein a groove body capable of arranging a liquid film is formed in the column body, the groove body comprises a first groove body and a second groove body, the first groove body is arranged in a windward area of the column body and used for removing large particles which do inertial motion along with dust-containing gas, and the second groove body is arranged in a lateral wind area of the column body and used for removing small particles which do Brownian motion along with the dust-containing gas. Compared with the prior art, the invention realizes that not only an inertial collision mechanism but also a Brownian motion mechanism exist in the flow of the cylindrical streaming fluid, wherein the inertial collision mechanism reveals a dust removal mechanism that large particles collide with slots on the windward side along with the movement of the fluid, and small particles escape from the slots on the windward side along with the flow, and the motion mechanism is random Brownian motion.
In addition, the invention also provides a dust removal device for the cascade arrangement membrane descending columns, which comprises the membrane descending columns arranged in a sparse-to-dense array in sequence from the inflow direction to the outflow direction of the dust-containing gas. The cascade arrangement mode effectively utilizes the dust removal effect brought by the dust removal mechanism of Brownian motion and inertial collision, and improves the particle removal rate; the size of the slotting angle is changed according to the air speed, so that excessive liquid film arrangement is avoided; the arrangement mode that the front part of the falling film column is sparse and the back part of the falling film column is dense effectively prevents the flow channel from being blocked.
Although the film distributing water quantity required by a single falling film column in the structure of the invention is higher than that of the traditional falling film column which is only slotted on the windward side, the dust removal efficiency of one device is calculated by taking the device as a unit. Take the following embodiment as an example: as shown in fig. 2, the first groove body of the falling film column is formed by intersecting two straight edges, the grooving angle is 90 degrees, the groove width is 5mm, and the groove depth is 2.5 mm; the second tank parameters are identical to the first tank parameters. The length of the falling film column is 300 mm. Two staggered equal-interval membrane-reducing column rows form a unit row, and the cascade mode is as shown in fig. 9: first unit row C1Transverse and longitudinal spacing W of inner falling film column17mm, first unit row C1And the second unit row C2A distance L between1Is 7 mm; second unit row C2Transverse and longitudinal spacing W of inner falling film column26mm, second unit row C2And the third unit row C3A distance L between2Is 6mm, and so on, W3、L3；W4、L4；W5、L5；W6、L6Are respectively 5; 4; 3; 2 mm. With this as a unit, the device is formed by stacking a plurality of units one on top of the other. For the dust-containing gas with the inlet flow rate of 1.5m/s and the particle size of 1 mu m, on the basis of achieving the same removal rate, the water consumption of the dust remover is 40 percent of that of the traditional single-groove falling-film column array dust remover with the same characteristic size and the falling film column spacing of 4 mm.
In addition, in order to further reduce the water consumption, namely reduce the energy consumption, the volume of the second groove body slot of the rear row pipe can be set to be smaller than that of the second groove body slot of the front row pipe according to the movement characteristics of the cross flow fluid and the combination of the inertia movement mechanism and the Brownian movement mechanism. Because the air exhaust speed is higher after the air is exhausted, the effect of the Brownian motion on the particle removal rate is less obvious, and after the factors of water consumption and removal efficiency are balanced, the size of the side air face groove body is set by a reasonable grooving volume, so that the energy consumption can be further reduced.
The invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of a first falling film column structure in a preferred embodiment of the present invention.
Fig. 2 is a schematic view of a second falling film column configuration in a preferred embodiment of the present invention.
Fig. 3 is a schematic view of a third falling film column structure in a preferred embodiment of the present invention.
Fig. 4 is a schematic view of a fourth falling film column configuration in a preferred embodiment of the present invention.
Fig. 5 is a schematic view of a fifth falling film column structure in a preferred embodiment of the present invention.
Fig. 6 is a schematic view of a sixth falling film column structure in a preferred embodiment of the present invention.
Fig. 7 is a schematic view of the main structure of a falling film apparatus in a preferred embodiment of the present invention.
Fig. 8 is a schematic top view of an array arrangement of falling film columns in a preferred embodiment of the present invention.
Fig. 9 is a schematic view of a cascade arrangement of falling film columns in a preferred embodiment of the present invention.
FIG. 10 is a graph showing the relationship between particle size and dust removal efficiency of an object to be cleaned.
FIG. 11 is a graph showing the relationship between the Stk number of particles and the removal rate at different gas Reynolds numbers.
Description of reference numerals:
10 column bodies,
20 a first groove body,
30 second groove bodies, 31 surrounding type structures,
40 distribution plate,
50 slot angle.
Detailed Description
The present invention is further explained and illustrated by the following embodiments, which should be understood that the purpose of the following embodiments is to make the technical solution of the present invention more clear and easy to understand, and not to limit the protection scope of the claims.
As shown in fig. 1, the invention discloses a membrane falling column for cross fluid dust removal, which comprises a column body 10, wherein a groove body capable of arranging a dust removal liquid membrane is formed in the column body 10, the groove body comprises a first groove body 20 and a second groove body 30, the first groove body 20 is arranged in an upwind area and used for removing large particles which do inertial motion along with fluid to be subjected to dust removal, and the second groove body 30 is arranged in a crosswind area and used for removing small particles which do brownian diffusion motion along with the fluid to be subjected to dust removal.
In a preferred embodiment, the second chutes 30 are disposed on both sides of the crosswind zone, or only on one side, or are disposed at intervals along the circumferential side of the column 10, so as to increase the effective area for receiving small particles.
In a preferred embodiment, the side length of the groove bottom of the second groove body 30 is 2-12 mm, the grooving angle is 30-150 °, the groove width is 1.5-11 mm, the groove depth is 0.3-5.4 mm, and the falling film column length is 300-400 mm.
In a preferred embodiment, the bottom of the second groove 30 is formed in a straight line shape, a convex shape or a concave shape for increasing the collision of the small particles with the second groove.
In a preferred embodiment, the second channel 30 forms an encircling structure 31 in a manner that can accommodate the direction of flow of the column around the flowing fluid.
In a preferred embodiment, the inner wall of the second tank 30 is formed with a rough surface for enhancing the binding force of the liquid film with the inner wall of the tank.
The invention also discloses a dust removal device with the cascade arrangement membrane descending columns, which comprises the membrane descending columns which are arranged in a sparse-to-dense array in sequence from the direction of meeting the flowing direction of the fluid to be dedusted to the flowing direction. The falling film column is specifically arranged in a manner that distribution plates are arranged along the height direction, and the falling film column is fixed between the distribution plates, and the specific arrangement manner can refer to patent CN 110652807A.
In a preferred embodiment, the size of the second tank body at the outflow side of the dust-containing gas is smaller than that of the second tank body at the inflow side, and the size of the second tank body at the outflow side is reduced to reduce the energy consumption for arranging the liquid film on the tank body.
The present invention will be further illustrated by the following specific examples.
Example 1
This embodiment 1 provides a falling film column for improving small particle removal efficiency, including a column body vertically distributed for bearing a water film, where the column body is provided with a tank body, and at least a liquid film is distributed at a position where the tank body is provided, and the column body includes both a case where the liquid film is arranged in the tank body and a case where the liquid film is arranged outside the tank body, but for water saving and energy saving, it is a preferable scheme to arrange the liquid film in the tank body as much as possible.
The windward side of cylinder is equipped with first cell body, and the crosswind side of cylinder is equipped with the second cell body, first cell body for receive the great large granule of inertia.
Here, the application of cross-flow particulate removal needs to be explained. Firstly, the dust-containing gas sweeps across the falling film column in the direction vertical to the falling film column; these particles to be removed then comprise both large particles, which have a relatively large inertia following the flow of the fluid, and small particles, which have a relatively strong brownian motion of the particles themselves.
The particle size distribution of a dust-containing gas particle is shown in FIG. 10, and it is understood from the figure that the mass ratio of particles having a particle size of less than 2.5 μm is very low, even less than 20%, but the number ratio thereof exceeds 90%. And the particles in this size range are PM2.5, also known as fines. Compared with the thicker atmospheric particulates, the fine particles have small particle size, large specific area, strong activity, easy attachment of toxic and harmful substances (such as heavy metals, microorganisms and the like), long retention time in the atmosphere and long conveying distance, thereby having larger influence on human health and atmospheric environmental quality. With the higher and higher requirements of China on the quality of environmental air, the removal of fine particles is more meaningful and unbearable.
The problem is that the technical scheme of only slotting on the windward side in the prior art can remove large particles and also can remove partial small particles. But the removal rate of small particles is very low, and the total removal rate of the unit row also has great promotion space. The removal mechanism of the small particles is mainly Brownian motion, and when the removal rate of the small particles is further improved, the total removal rate of the unit row can be improved by improving the dust removal structure, and the problem of low removal rate of the small particles is solved by fully utilizing the Brownian motion mechanism.
According to FIG. 11, the maximum Stk of particles at a certain Reynolds number of gas at a removal rate of 0cThe number is defined as the critical Stk number at the reynolds number of the gas. As can be seen, Stk increases with increasing gas Reynolds numbercThe number is gradually reduced whenever Stk is satisfied>StkcThe particle removal rate of (a) gradually increases. The Stk number of the pellets is positively correlated with the pellet size depending on the physical properties of the gas, and it can be seen from FIG. 11 that: increasing the gas Reynolds number decreases StkcThe particles with smaller particle size can be removed, and the removal rate of the particles with the same particle size is improved. In addition, when the Reynolds number of the gas is low, although Stk is lowcThe number is higher but the brownian motion mechanism still contributes significantly to the removal of small particles. Therefore, a front sparse and rear dense-cascade membrane descending column arrangement mode in which the dust-containing gas flows into the outflow direction is provided. At the inflow end, the distance between the falling film columns is wide, the sectional area of a dust-containing gas flow channel is large, the gas Reynolds number is relatively low, but large particles still have high Stk number due to large mass and can be captured on the windward side, and grooves are formed in the two lateral windward sides of the falling film columns for removing the dust-containing gas particles by means of Brownian motion; the cross section area of the dust-containing gas flow passage is reduced along with the sequential narrowing of the intervals of the rear falling film columns, the Reynolds number of the gas is gradually increased, and the StkcThe number is gradually reduced so that particles having smaller particle sizes can also be inertially dislodged. The removal rate of the windward side caused by interception, inertial collision and other mechanisms is gradually increased, the influence of Brownian motion on the removal rate is gradually reduced to be negligible due to the increase of the air speed of the side windward side, so that the slotting angle of the windward side of the falling film column is gradually increased along with the narrowing of the space between the falling film columns, and the slotting angle of the side windward side is gradually reduced or even cancelledGrooving is a more reasonable film distribution mode.
Therefore, the second groove body is arranged on the side wind surface and combined with the first groove body, so that large particles in inertial motion can be removed comprehensively, and the problem of removing small particles in Brownian motion can be solved, and the dust removal efficiency of the whole falling film column is improved.
Further, the second groove body can be arranged on one side, close to the first groove body, of the periphery of the column body, can also be arranged on two sides of the column body, and can also be uniformly arranged along the periphery at intervals, so that the second groove body is arranged on the side wind surface to meet the Brownian motion law, and the collision efficiency of small particles and the second groove body is increased.
Further, the second groove body comprises a bottom and a side part, the bottom can be in an arc-shaped structure protruding outwards along the radial direction, can also be in an arc-shaped structure protruding inwards along the radial direction, and can also be in a groove body structure with both the bottom and the side part being in a linear shape, even the bottom can be provided with a corrugated surface, and the groove body with the cross section being in an encircling structure is used for meeting the fluid flow direction of the fluid on the side wind surface, so that the collision probability of small particles and the second groove body is increased, and the removal efficiency is improved.
Further, for effective control water film water consumption to the water consumption that tries lessly reaches the desorption efficiency that tries high, the fluting size of the first cell body of rational layout and second cell body, specifically, the fluting angle ratio of second cell body and first cell body is 0 ~ 1, and is close to dusty gas outflow side more, and this ratio is less.
This embodiment 1 has still provided a desorption device that forms of arranging with above-mentioned falling membrane post array, includes and falls the membrane post along waiting that the fluid stream that removes dust is dense after leading sparse, specifically, this desorption device comprises a plurality of units, contains a plurality of unit row C in a unitnThe falling film columns in the unit rows are uniformly distributed in a triangular staggered manner, and the row spacing and the column spacing of the falling film columns are equal to Wn. Inflow-side cell row CnAnd the unit row C on the outflow siden+1Has a line spacing of LnValue of (A) and WnThe same is true. Inflow side unit row inner falling film column spacing WnThe distance W between the inner falling film column and the outflow side unit rown+1Has a relationship of Wn-Wn+1And C is 0.1-1 mm. The space between the inflow side falling film columns is wide, the gas flow cross section is large, the gas velocity is low, and the brownian motion can be fully utilized to remove small particles; the flow cross section of the dust-containing gas is continuously reduced to improve the speed increase and increase the Stk number of the particles, thereby achieving the purposes of improving the particle removal rate and controlling the energy consumption.
Specifically, for the arrangement more rationally along the falling membrane post of dusty gas flow direction to reach water conservation, energy-conserving effect, the second cell body that sets up on the cylinder of back row is less than the size of the second cell body of front bank, because dusty gas outflow side falls the membrane post interval narrower, and the gas flow sectional area is littleer, and the gas velocity is higher. Along with the increase of the gas velocity, the removal effect brought by the Brownian motion is smaller, and the removal rate of the second tank body is mainly influenced by the Brownian motion, so that the second tank body with the same size is not required to be arranged like a front row, and the second tank body with the smaller size can be replaced, so that the water consumption is reduced, and the energy consumption is reduced.
Example 2
Referring to fig. 9, provided herein is a falling film column applied to cross-flow dust removal, comprising a falling film column body, and a first flow limiting groove and a second flow limiting groove on the falling film column body. The diameter of the falling film column body is 8mm, the grooving angle of the first flow-limiting groove is constant at 120 degrees, and the groove depth is 2.5 mm; second groove body grooving angle alphan120 to 20 degrees and the groove depth dn2.5-0.5 mm. The grooving angle and the groove depth are uniformly reduced along with the flowing of the dust-containing gas to the second groove body. The dust removal unit comprises 6 unit rows. Two staggered equal-interval membrane-reducing column rows form a unit row, and the cascade mode is a first unit row C1Transverse and longitudinal spacing W of inner fluid column1Is 7mm, and the grooving angle alpha of the second groove body of the film falling column in the unit row1And depth d of slot1120 degrees and 2.5mm respectively. First unit row C1And the second unit row C2A distance L between1Is 7 mm; second unit row C2Transverse and longitudinal spacing W of inner fluid column2Is 6mm, and the slotting angle alpha of the second slot body in the unit row2And depth d of slot2Respectively 100 degrees and 2.1 mm. Second unit row C2And the third unit row C3A distance L between2Is 6mm, and so on, W3、L3、α3、d3；W4、L4、α4、d4；W5、L5、α5、d5；W6、L6、α6、d6Respectively 5mm, 80 degrees and 1.7 mm; 4mm, 60 degrees and 1.3 mm; 3mm, 40 degrees and 0.9 mm; 2mm, 20 degrees and 0.5 mm.
In this embodiment 2, the existence of the flow-limiting grooves and the cascade arrangement of the flow-limiting grooves greatly reduce water consumption compared with a pure liquid column, and the particle removal rate is increased by the side air surface falling film. Meanwhile, the cascade arrangement mode of front thinning and back dense is used, the gas flow rate is improved by reducing the flow passage area, the particle removal rate is further improved, and the device is prevented from being blocked.
In the above embodiment, the removal rate data is as follows: the removal rate of one unit of particles with the particle size of 1 mu m is 60% when the gas velocity is 1.5m/s, and the removal rate of the traditional single-groove falling film column array dust removal device mentioned in the patent number CN110652807A with the same number of unit rows and the liquid column spacing of 4mm is only 11%, so that the cascaded dust removal device provided by the invention has the advantage that the dust removal efficiency is greatly improved compared with the prior art.
While the present invention has been described by way of examples, and not by way of limitation, other variations of the disclosed embodiments, as would be readily apparent to one of skill in the art, are intended to be within the scope of the present invention, as defined by the claims.
Claims (8)
1. A falling film column for cross fluid dust removal is characterized in that:
comprises a column body (10), a groove body which can be provided with a dust removal liquid film is arranged on the column body (10),
the tank body comprises a first tank body (20) and a second tank body (30),
the first groove body (20) is arranged in the windward area of the column body (10) and is used for removing large particles which do inertial motion along with the dust-containing gas,
the second groove body (30) is arranged in a side wind area of the column body (10) and is used for removing small particles which do Brownian motion in the dust-containing gas.
2. The falling film column for cross-fluid dedusting of claim 1, wherein:
the second groove bodies (30) are arranged in the side wind areas on the two sides, or are arranged only on one side, or are arranged along the periphery of the column body (10) at intervals in a distributed mode, and are used for increasing the effective area for capturing small particles.
3. The falling film column for cross-fluid dedusting of claim 1, wherein:
the length of the bottom edge of the second groove body (30) is 2-12 mm, the grooving angle (50) formed by the intersection point of the bottom edge of the groove and the external circular side line of the cross section and the circle center is 30-150 degrees, the groove width is 1.5-11 mm, the groove depth is 0.3-5.4 mm, and the length of the falling film column is 300-400 mm.
4. The falling film column for cross-fluid dedusting of claim 1, wherein:
the bottom of the second groove body (30) is in a linear shape, a convex shape or a concave shape, and the collision efficiency of the small particles and the second groove body is increased.
5. The falling film column for cross-fluid dedusting of claim 1, wherein:
the second groove body (30) forms an encircling structure (31) in a mode of being capable of adapting to the flowing direction of the cylinder streaming fluid.
6. The falling film column for cross-fluid dedusting of claim 1, wherein:
the inner wall of the second groove body (30) forms a rough surface for enhancing the binding force of the liquid film and the inner wall of the groove body.
7. The utility model provides a cascade membrane post dust collector that falls that arranges which characterized in that:
the membrane-reducing column comprises the membrane-reducing columns according to any one of claims 1-6, wherein the membrane-reducing columns are arranged in a sparse-to-dense array from the inflow direction to the outflow direction of dust-containing gas.
8. The cascade arrangement falling film column dust removal device of claim 7, wherein:
the size of the second groove body close to the outflow side is smaller than that of the second groove body close to the inflow side, and the energy consumption for arranging the liquid film on the groove body is reduced by reducing the size of the second groove body close to the outflow side.
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