CN103623660A - Demister - Google Patents
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- CN103623660A CN103623660A CN201210306751.7A CN201210306751A CN103623660A CN 103623660 A CN103623660 A CN 103623660A CN 201210306751 A CN201210306751 A CN 201210306751A CN 103623660 A CN103623660 A CN 103623660A
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Abstract
The invention discloses a demister to resolve the problems of an existing demister such as poor defoaming effect, easy blockage of the silk screen, complex structure and huge difficulty in manufacturing. The demister provided by the invention is provided with silk screen packing (2); and at least 2 layers of grid packing (3) are arranged below the silk screen packing. Each layer of grid packing is provided with an inclined channel, which is inclined to the horizontal plane; and the inclined channel comprises horizontally-arranged bar-shaped plates (31) and longitudinally-arranged bar-shaped plates (32), which are inclined to the horizontal plane. The grid packing is arranged on the upper surface of the top layer of silk screen packing; and in each layer of grid packing, an upper layer of grid packing is placed on the upper surface of a lower layer of grid packing. In two adjacent layers of grid packing, the inclined channels are arranged in a staggering manner; and the inclination directions relative to the horizontal plane of the horizontally-arranged bar-shaped plates and longitudinally-arranged bar-shaped plates are opposite. The invention is mainly used in occasions requiring liquid foam removal from gas for the industries such as petroleum chemical industry, thermal power and steel.
Description
Technical field
The present invention relates to a kind of for remove the demister of liquid entrainment from gas of the industry uses such as petrochemical industry, thermoelectricity, iron and steel.
Background technology
Demister belongs to gas-liquid separation device, for remove liquid foam from gas.In the gas of discharging, contain liquid foam when (sometimes also containing dust), purity can reduce greatly, affects product quality, and causes liquid-consumed.If such gas enters atmosphere, also can cause atmosphere pollution.Therefore, developing the demister that foam removal is effective, efficiency is high, is very necessary.
The disclosed Wave silk screen foam remover of Chinese patent CN2305241Y, the waveform silk screen piece being mainly combined into after mold pressing by silk screen grid, silk screen forms, and the trough that can make the liquid of demister under removing be flowed to rapidly waveform silk screen piece is concentrated, and forms after large drop lower.So just formed the shunting mode of making gas circuit ,Ye Zouye road leave with rage.The problem that this Wave silk screen foam remover exists is: 1. only use silk screen filter, when empty tower gas velocity is higher, foam removal effect is poor.2. silk screen is easily stopped up by the dust in gas; Especially in the flue gas foam removal process of flue gas desulfurization occasion, because the dust that flue gas is carried secretly is more, silk screen more easily stops up.
The disclosed baffle plate demister of CN201064699Y, comprises shell and the some settings separating layer on air-flow cross section in the enclosure.Separating layer consists of some defoaming plates spaced apart, and defoaming plate is provided with concavo-convex drain structure.Defoaming plate is used the flap with a bending or two bendings conventionally, and each drain structure on same flap adopts the alternate formal distribution of convex-concave.Each separating layer is also provided with some water injection systems of rinsing separately use, to the dust being deposited on defoaming plate is rinsed out, keeps the foam removal efficiency of defoaming plate.The problem that this baffle plate demister exists is: 1. the structure of defoaming plate is comparatively complicated, and manufacture difficulty is large.2. only use the separating layer foam removal consisting of defoaming plate, when empty tower gas velocity is lower, foam removal effect is just poor; When empty tower gas velocity is higher, foam removal effect is poorer.
The disclosed Combined defoamer of CN201482246U, comprises tank body, and tank body is provided with vapour phase import, vapor phase exit, liquid-phase outlet, is provided with silk screen Despumation device and centrifugal separating device in tank body.Centrifugal separating device is comprised of parts such as the dividing plate with through hole, vane turbine and conical hoppers, and vane turbine is comprised of a plurality of vane plates again.Centrifugal separating device is separated into the inner chamber of tank body cyclone separating chamber and the flash chamber communicating.During operation, the steam centrifugal separating device of first flowing through is removed a part of liquid foam, then the silk screen Despumation device of flowing through is further removed liquid foam.The problem that this Combined defoamer exists is: 1. the structure of centrifugal separating device is comparatively complicated, and manufacture difficulty is larger; 2. for the flue gas foam removal process of flue gas desulfurization occasion, because the dust that flue gas is carried secretly is more, easily make silk screen Despumation device stop up.
Summary of the invention
The object of this invention is to provide a kind of demister, the problem such as the foam removal effect that existing demister exists is respectively poor, silk screen easily stops up to solve, structure is comparatively complicated, manufacture difficulty is larger.
For addressing the above problem, the technical solution used in the present invention is: a kind of demister, be provided with wire packing, it is characterized in that: the below of wire packing is provided with grid packing, grid packing at least arranges 2 layers, each layer of grid packing is all with the ramp way tilting with horizontal plane, by tilting with horizontal plane and cross one another horizontally-arranged stripe board and tandem stripe board form, horizontally-arranged stripe board between each layer of grid packing is identical respectively with the length direction of tandem stripe board, wire packing and each layer of grid packing are disc, upper and lower surface is plane, wire packing is positioned on the upper surface of the superiors' grid packing, in each layer of grid packing, upper strata grid packing is positioned on the upper surface of lower floor's grid packing, in neighbouring two-layer grid packing, ramp way is staggeredly arranged, horizontally-arranged stripe board and tandem stripe board incline direction is with respect to the horizontal plane contrary respectively.
Adopt the present invention, there is following beneficial effect: in (1) use procedure, the pending gas that contains liquid foam and dust flows from bottom to top, successively by each layer of grid packing and wire packing.A plurality of ramp way introversion bafflings that up and down stagger of gas in multilayer grid packing are moving, and contained large drop and dust can accumulate on the upper surface of horizontally-arranged stripe board and tandem stripe board after encountering horizontally-arranged stripe board and tandem stripe board; When accumulating to a certain degree, the accumulation of drop and dust is tilted to lower landing along the upper surface of horizontally-arranged stripe board and tandem stripe board, can be entrained in a large number on the wire packing of grid packing top by gas, so just avoid dust to stop up too quickly wire packing.By the superiors' grid packing effluent air, only remained and have a small amount of fine droplets and micro-dust, continue upwards to flow with gas, during by wire packing, major part is filtered; Fine droplets is accumulated into large drop and falls, and micro-dust together falls thereupon.The present invention carries out two-stage foam removal by the filler of two sections of different structure forms, and foam removal effect is better; When empty tower gas velocity higher (reaching 3.21 meter per seconds), foam removal effect is still relatively good.(2) wire packing of the present invention can be used existing wire packing.Grid packing simple in structure regular, is easy to manufacture.And because vertical range and the vertical range between tandem stripe board between the factor of the structure aspects of grid packing own and voidage higher (voidage is generally 99.0%～99.5%) thereof, horizontally-arranged stripe board are relatively large, so gas can pass through grid packing swimmingly, pressure drop is less, make gas pass through the whole pressure drop also less (being generally 260～400Pa) of demister.And grid packing itself has certain dedusting function, be not easy to be stopped up by dust.(3) demister of the present invention needn't arrange water injection system, water rinses out dust, thereby has simplified demister structure, saved equipment investment and operating cost.
When the gas that contains dust to identical carries out foam removal, because demister of the present invention (comprising wire packing and grid packing) is not easy to be stopped up by dust, be about 2～3 times of existing screen type demister its lasting service time.In addition, demister of the present invention is arranged on (this tower all leaves and is exclusively used in the space that demister is installed) in the tower that need carry out foam removal while using, belong to tower internals, rather than single devices.It does not need independently installing space, does not occupy the space outerpace position of the tower that need carry out foam removal, and space occupy-place is low.
The present invention is mainly used in the occasion that the industries such as petrochemical industry, thermoelectricity, iron and steel need to be removed liquid foam from gas, for example, for the flue gas foam removal of flue gas desulfurization occasion.Higher at empty tower gas velocity, liquid-gas ratio is higher, dust content is higher in gas in the situation that, the present invention is especially applicable.
Below in conjunction with accompanying drawing, the specific embodiment and embodiment, the present invention is further detailed explanation.Accompanying drawing, the specific embodiment and embodiment do not limit the scope of protection of present invention.
Accompanying drawing explanation
Fig. 1 is the structural representation of demister of the present invention; This demister is installed on and need carries out in the tower of foam removal.
Fig. 2 is the sectional perspective structural representation of grid packing in demister of the present invention.
Fig. 3 is the schematic diagram that neighbouring two-layer grid packing medium dip passage is staggeredly arranged.
Fig. 4 is the schematic diagram of vertical range between horizontally-arranged stripe board or tandem stripe board in individual layer grid packing.
Fig. 5 is a kind of schematic diagram of purge hole; The bottom outlet of purge hole is rectangle, and venthole is half elliptic.
Fig. 6 is the A-A cutaway view (amplification) in Fig. 5.
Fig. 7 is the schematic diagram of the second purge hole; The bottom outlet of purge hole is rectangle, and venthole is trapezoidal.
Fig. 8 is the schematic diagram of the third purge hole; The bottom outlet of purge hole and venthole are trapezoidal.
Fig. 9 is the schematic diagram of the 4th kind of purge hole; Bottom outlet and the venthole of purge hole are half elliptic.
In Fig. 1 to Fig. 9, same reference numerals represents identical technical characterictic.
The specific embodiment
Referring to Fig. 1 and Fig. 2, Fig. 3, demister of the present invention is provided with one deck wire packing 2, and the below of wire packing 2 is provided with grid packing 3, and grid packing 3 at least arranges 2 layers.Each layer of grid packing 3 be all with the ramp way tilting with horizontal plane, by tilting with horizontal plane and cross one another horizontally-arranged stripe board 31 and tandem stripe board 32 form; Horizontally-arranged stripe board 31 and tandem stripe board 32 are planar shaped strip plate.Single ramp way is shaped as parallelogram (referring to Fig. 3) on horizontal plane.In individual layer grid packing 3, between horizontally-arranged stripe board 31, be parallel to each other, between tandem stripe board 32, be parallel to each other.In each layer of grid packing 3, the length direction of horizontally-arranged stripe board 31 and tandem stripe board 32 is identical respectively.As shown in Figure 1, Figure 2 and Figure 3, when towards grid packing 3, by length direction, the stripe board in lateral attitude is called horizontally-arranged stripe board 31 in the present invention, and another row is called tandem stripe board 32 with the stripe board that horizontally-arranged stripe board 31 is intersected.Horizontally-arranged stripe board 31 of the present invention and tandem stripe board 32 tilt with horizontal plane, refer to that horizontally-arranged stripe board 31 and tandem stripe board 32 broad ways favour horizontal plane.The all horizontal settings of horizontally-arranged stripe board 31 and tandem stripe board 32, are all positioned on horizontal plane along its length.
Wire packing 2 is disc with each layer of grid packing 3, and upper and lower surface is plane.Wire packing 2 is positioned on the upper surface of the superiors' grid packing 3; In each layer of grid packing 3, upper strata grid packing 3 is positioned on the upper surface of lower floor's grid packing 3 (as shown in Figure 1).In neighbouring two-layer grid packing 3, ramp way be staggeredly arranged (referring to Fig. 3 and Fig. 1).In Fig. 3, the projection of the lower surface of blank grid representation upper strata grid packing 3 on horizontal plane, the projection of the upper surface of the grid representation lower floor grid packing 3 of blacking on horizontal plane.On upper strata grid packing 3 lower surfaces, each crosspoint of horizontally-arranged stripe board 31 and tandem stripe board 32 lays respectively at the geometric center of each ramp way on lower floor's grid packing 3 upper surfaces, and on lower floor's grid packing 3 upper surfaces, each crosspoint of horizontally-arranged stripe board 31 and tandem stripe board 32 lays respectively at the geometric center of each ramp way on upper strata grid packing 3 lower surfaces; This is the best way that neighbouring two-layer grid packing 3 medium dip passages are staggeredly arranged.
From Fig. 2 and Fig. 3, the horizontally-arranged stripe board 31 in individual layer grid packing 3 and tandem stripe board 32 form the grid that is roughly groined type on horizontal plane.The general employing of infall of horizontally-arranged stripe board 31 and tandem stripe board 32 is welded to connect.
In neighbouring two-layer grid packing 3, horizontally-arranged stripe board 31 and tandem stripe board 32 incline direction is with respect to the horizontal plane contrary respectively; Be horizontally-arranged stripe board 31 incline direction with respect to the horizontal plane contrary (figure is slightly), tandem stripe board 32 incline direction with respect to the horizontal plane contrary (as shown in Figure 1).This just can make the incline direction of neighbouring two-layer grid packing 3 medium dip passages change.The set-up mode being staggeredly arranged together with neighbouring two-layer grid packing 3 medium dip passages, general purpose is in order to strengthen the contained liquid foam of the pending gas that enters in grid packing 3 and the collision of dust and horizontally-arranged stripe board 31 and tandem stripe board 32, to promote gathering of liquid foam and dust.Liquid foam and dust gather the rear easy upper surface landing along horizontally-arranged stripe board 31 and tandem stripe board 32, thereby separated from the gas.
Demister of the present invention, grid packing 3 is generally that 2～3 layers (what shown in Fig. 1, arrange is 3 layers) are set.
Referring to Fig. 2 and Fig. 4 to Fig. 9, when pending fuel gas and dust content in entering grid packing 3 is higher (being not less than 60 milligrams/standard cubic meter), in the horizontally-arranged stripe board 31 that demister of the present invention can be in each layer of grid packing 3 and tandem stripe board 32, purge hole 6 is all set.Purge hole 6 comprises the bottom outlet 61 of being located at the planar shaped in horizontally-arranged stripe board 31 and tandem stripe board 32, and the top of bottom outlet 61 is provided with top cover 62, and top cover 62 is protruding to the top of horizontally-arranged stripe board 31 and tandem stripe board 32 upper surfaces respectively.Bottom outlet 61 and top cover 62 respectively have a lower limb, between two lower limbs, form pore 63; Bottom outlet 61 and top cover 62 remaining edge interconnect.Purge hole 6 shown in Fig. 5, bottom outlet 61 is rectangle, venthole 63 is half elliptic.Purge hole 6 shown in Fig. 7, bottom outlet 61 is rectangle, venthole 63 is trapezoidal.Purge hole 6 shown in Fig. 8, bottom outlet 61 and venthole 63 are trapezoidal.Purge hole 6 shown in Fig. 9, bottom outlet 61 and venthole 63 are half elliptic.Above-mentioned various purge hole 6, generally all adopts process for stamping manufacture.The cutaway view of the purge hole 6 A-A position in being equivalent to Fig. 5 shown in Fig. 7 to Fig. 9 is all identical with Fig. 6.When bottom outlet 61 and venthole 63 are trapezoidal, be preferably isosceles trapezoid.As seen from Figure 6, venthole 63 is substantially perpendicular to horizontally-arranged stripe board or tandem stripe board.The area of the bottom outlet 61 of various purge holes 6 is generally 30～150 square millimeters, and the area of venthole 63 is generally 1/5～1/3 of bottom outlet 61 areas.In addition, the stripe board in Fig. 4 to Fig. 9 is not noted Reference numeral; They both can represent horizontally-arranged stripe board 31, can represent tandem stripe board 32 again.In Fig. 4, the length direction of stripe board is perpendicular to paper.
Referring to Fig. 2, surrounding at 3 one ramp ways of grid packing, there are two horizontally-arranged stripe board 31 and two tandem stripe board 32, can be in the above along the length direction of horizontally-arranged stripe board 31 and tandem stripe board 32,1～3 purge hole 6 (shown in Fig. 2 is that a purge hole 6 is set respectively) be set respectively.In two horizontally-arranged stripe board 31 and two tandem stripe board 32 of an above-mentioned ramp way surrounding, there is the upper surface of a horizontally-arranged stripe board 31 and a tandem stripe board 32 to be positioned at this ramp way; When purge hole 6 is set, top cover 62 and venthole 63 in this ramp way (as shown in Figure 2).
When pending fuel gas and dust content in entering grid packing 3 is lower (lower than 60 milligrams/standard cubic meter), in the horizontally-arranged stripe board 31 that demister of the present invention just need to be in grid packing 3 and tandem stripe board 32, purge hole 6 is set, as shown in Figure 1.Standard cubic meter of the present invention is by standard state; Standard state refers to 0 ℃, 1 standard atmospheric pressure.
Referring to Fig. 1 to Fig. 4, the main structure parameters of demister of the present invention is generally as follows: in individual layer grid packing 3, angle β between horizontally-arranged stripe board 31 and horizontal plane is 30～85 degree, angle α between tandem stripe board 32 and horizontal plane is 30～85 degree, and the angle γ between horizontally-arranged stripe board 31 and tandem stripe board 32 is 20～90 degree (angle γ measures at the upper surface of individual layer grid packing 3).Vertical range t between vertical range t between horizontally-arranged stripe board 31 and tandem stripe board 32 is 20～200 millimeters, referring to Fig. 4 and Fig. 1 (in Fig. 1, only showing the vertical range t between tandem stripe board 32).In individual layer grid packing 3, the vertical range between horizontally-arranged stripe board 31 is generally got identical numerical value, and the vertical range between tandem stripe board 32 is generally got identical numerical value; Between horizontally-arranged stripe board and tandem stripe board, the described desirable identical or different numerical value of two vertical ranges.The voidage of individual layer grid packing 3 is 99.0%～99.5%, and specific area is 60～125 metre squared per cubic; The thickness of horizontally-arranged stripe board 31 and tandem stripe board 32 is 1～3 millimeter.Above-mentioned voidage refers to the shared percentage by volume in space in the grid packing 3 of unit volume, and specific area refers to horizontally-arranged stripe board 31 and the total surface area of tandem stripe board 32 in the grid packing 3 of unit volume.
Any in above-mentioned angle β, angle α and angle γ, is preferably 30 degree, 45 degree or 60 degree.
In neighbouring two-layer grid packing 3, identical but the opposite direction of the numerical value of angle β between horizontally-arranged stripe board 31 and horizontal plane, identical but the opposite direction of the numerical value of angle α between tandem stripe board 32 and horizontal plane, so that horizontally-arranged stripe board 31 is contrary respectively with tandem stripe board 32 incline direction with respect to the horizontal plane in neighbouring two-layer grid packing 3.
Referring to Fig. 1, demister of the present invention, the height a of wire packing 2 is 50～100 millimeters (being preferably 100 millimeters), the height b of individual layer grid packing 3 is 50～300 millimeters (being preferably 150 millimeters).Wire packing 2 can be used the gas-liquid filteration silk screen of stipulating in China-styled Certain Industry Field standard < < HG/T 21618-1998 wire mesh demister > >, as the gas-liquid filteration silk screen of SP, HP, DP or HR type.
Referring to Fig. 1, demister of the present invention in use, is installed in the tower 5 (referred to as tower) that need carry out foam removal, is normally installed on the top of tower 5.Tower 5 is generally gas-liquid separation tower, such as decarbonizing tower of the absorption tower of flue gas desulfur device, dry gas desulfurizing tower, decarburization device for producing hydrogen etc.The diameter d of each layer of grid packing 3 will be slightly less than the interior diameter D of tower 5, so that install; D is generally 0.8～12 meter.When wire packing 2 is not installed, slightly larger in diameter is in the interior diameter D of tower 5; After installation, the madial wall of tower 5 is close in its side.The lower surface of orlop grid packing 3 is supported on support member 4, and the upper surface of wire packing 2 compresses with trim ring 1, with this, demister is fixed.(for example can use the support member of steel I-beam-vertical plate type cell structure and the trim ring of vertical plate type cell structure) that support member 4 and trim ring 1 can use existing demister to commonly use.
Choosing of each structural parameters of demister of the present invention, mainly according to need carry out the tower of foam removal tower diameter, need carry out foam removal gas composition and the requirement of foam removal effect is determined.
The material of each parts of demister of the present invention, is generally stainless steel (as 316L, 321,304 type stainless steels).
The operating process of demister of the present invention is described below with reference to Fig. 1.Top in tower 5, the pending gas that contains liquid foam and dust 7 flows from bottom to top, successively by each layer of grid packing 3 and wire packing 2.A plurality of ramp way introversion bafflings that up and down stagger of gas 7 in multilayer grid packing 3 are moving, and contained large drop (diameter is more than 30 microns) and dust can accumulate on the upper surface of horizontally-arranged stripe board 31 and tandem stripe board 32 after encountering horizontally-arranged stripe board 31 and tandem stripe board 32; When accumulating to a certain degree, the accumulation of drop and dust is tilted to lower landing along the upper surface of horizontally-arranged stripe board 31 and tandem stripe board 32, can be entrained in a large number on the wire packing 2 of grid packing 3 tops by gas, so just avoid dust to stop up too quickly wire packing 2.By the superiors' grid packing 3 effluent airs, only remained and have a small amount of fine droplets (diameter is less than 30 microns) and micro-dust (being mainly fine particle dust), continue upwards to flow with gas, during by wire packing 2, major part is filtered; Fine droplets is accumulated into large drop and falls, and micro-dust together falls thereupon.Like this, gas 7 passes through after grid packing 3 and wire packing 2 two-stage foam removals, and contained liquid foam and dust, substantially by Ex-all, become Purge gas; Purge gas is finally flowed out by the top exit of tower 5.Liquid-drop diameter of the present invention is equivalent diameter, refers to the ball diameter (drop diameter in embodiment herewith) equating with droplet size.In Fig. 1 and Fig. 2, Fig. 4 to Fig. 9, the arrow of unreceipted Reference numeral represents the flow direction of gas.
In above-mentioned operating process, gas 7 is generally 260～400Pa by the whole pressure drop of demister of the present invention).
Referring to Fig. 2 and Fig. 4 to Fig. 9, in the situation that enter that pending gas 7 dust contents in grid packing 3 are higher, purge hole 6 be set in the horizontally-arranged stripe board 31 in grid packing 3 and tandem stripe board 32, while flowing in a plurality of ramp ways that stagger up and down of gas 7 in multilayer grid packing 3, part gas enters purge hole 6 by bottom outlet 61, by venthole 63, flowed out, along the upper surface of horizontally-arranged stripe board 31 and tandem stripe board 32, be tilted to current downflow.This drop and dust that contributes to accumulate on horizontally-arranged stripe board 31 and tandem stripe board 32 upper surfaces is tilted to lower landing along the upper surface of horizontally-arranged stripe board 31 and tandem stripe board 32, to keep foam removal, the dust removing effects of grid packing 3.In horizontally-arranged stripe board 31 and tandem stripe board 32, purge hole 6 is set, also helps the pressure drop that reduces each layer of grid packing 3.
The various data of the relevant demister of the present invention that this description specific embodiment is partly mentioned (data that do not comprise purge hole 6), are applicable in horizontally-arranged stripe board 31 and tandem stripe board 32, arrange or do not arrange in grid packing 3 demister of purge hole 6.
Embodiment
In cold model experiment tower, demister of the present invention is carried out to cold model experiment.Cold model experiment tower mainly comprises a vertical and cylindrical cylindrical shell, and interior diameter is 1000 millimeters, and material is lucite, is provided with top exit; Demister of the present invention is arranged on the top (accompanying drawing omit, can with reference to Fig. 1) of cold model experiment tower.Demister arranges one deck wire packing and 3 layers of grid packing, and the structure of grid packing is referring to the explanation of this description specific embodiment part.In each layer of grid packing, the ramp way in neighbouring two-layer grid packing be staggeredly arranged (by Fig. 3).Press Fig. 2, in two horizontally-arranged stripe board of a ramp way surrounding of grid packing and two tandem stripe board, 1 purge hole is set respectively.The bottom outlet of purge hole is rectangle, and venthole is isosceles trapezoid (as shown in Figure 7); Wherein the length-width ratio of rectangle is 2: 1, and the height of isosceles trapezoid is 4 millimeters.The area of each bottom outlet is 128 square millimeters, and the area of venthole is 1/3 of bottom outlet area.
In each layer of grid packing, the material of horizontally-arranged stripe board and tandem stripe board is 304 type stainless steels, and the infall of horizontally-arranged stripe board and tandem stripe board all adopts and is welded to connect.
Wire packing is used the SP type gas-liquid filteration silk screen of stipulating in < < HG/T 21618-1998 wire mesh demister > >, materials'use 304 type stainless steels.
Other main structure parameters of demister is in Table 1.
Cold model experiment carries out under normal temperature (18～25 ℃), normal pressure (about 0.1MPa, absolute pressure) environment, and the top pressure of cold model experiment tower is normal pressure.The pending gas that contains liquid foam and dust, is comprised of normal temperature air, water and PETROLEUM PROCESSING fluidized catalytic cracking catalyst (Chang Ling USY, fresh catalyst).Water sprays in air, drop diameter between 5～2800 microns (wherein diameter be less than the trickle water droplet of 30 microns account for water droplet gross weight 6.5%), liquid-gas ratio is 1.8354 liters/m.Liquid-gas ratio is the volume ratio of water and air, by normal temperature and pressure state computation.Cold model experiment tower empty tower gas velocity, the volume flow by pending gas under normal temperature and pressure state is calculated.The diameter of catalyst dust (equivalent diameter) is 5～40 microns, and this equivalent diameter refers to the ball diameter equating with catalyst dust particle volume.In every cubic metre (by standard state) pending gas, contain 68 milligrams of catalyst dusts.
The above-mentioned gas that contains water droplet and catalyst dust flows from bottom to top in cold model experiment tower, carries out foam removal successively by 3 layers of grid packing and individual layer wire packing, removes catalyst dust simultaneously.Detailed foam removal process, referring to the explanation of this description specific embodiment part.Wherein ，You the superiors grid packing effluent air only remains the tiny catalyst dust that has a small amount of trickle water droplet and trace.
Totally 15 days cold model experiment time.
Gas after foam removal is flowed out by the top exit of cold model experiment tower, is disposed to atmosphere.Through sampling, detect, when empty tower gas velocity reaches 3.21 meter per second, do not have liquid water droplet to be entrained out by gas.When empty tower gas velocity reaches 3.31 meter per second, after every double centner foam removal, in effluent air, only carry the liquid water droplet of 1.05 kilograms secretly.And more existing screen type demisters just have liquid to be entrained out (baffle plate type demister just has liquid and is entrained out by gas under lower empty tower gas velocity) by gas when empty tower gas velocity reaches 1.85 meter per second.In industry actual mechanical process, the empty tower gas velocity that need carry out the tower of foam removal is generally no more than 2.5 meter per seconds, therefore can say that the present invention can avoid gas entrained liquids to be discharged in atmosphere effectively.For flue gas desulfurization occasion, can avoid desulfurization absorption liquid to be entrained out by flue gas and the environmental pollution and the economic loss that cause the present invention.
When empty tower gas velocity is 3.21 meter per second, after the top exit outflow of the gas after foam removal by cold model experiment tower, through sampling, detect, in every cubic metre of (by standard state) described gas, only contain 17 milligrams of catalyst dusts.With U-shaped pipe manometer (medium is water), measure, when empty tower gas velocity is 3.21 meter per second, the pressure reduction of demister bottom (being orlop grid packing lower surface) below near zone and demister top (being wire packing upper surface) top near zone is 360Pa; This pressure reduction is the whole pressure drop of demister of the present invention.
Cold model experiment finishes by inspection, the wire packing in demister and each layer of equal catalyst-free dust of grid packing clogging.
Table 1
| Project | Data |
| Angle in individual layer grid packing between horizontally-arranged stripe board and horizontal plane | 45 degree |
| Angle in individual layer grid packing between tandem stripe board and horizontal plane | 60 degree |
| Angle in individual layer grid packing between horizontally-arranged stripe board and tandem stripe board | 45 degree |
| Vertical range in individual layer grid packing between horizontally-arranged stripe board | 100 millimeters |
| Vertical range in individual layer grid packing between tandem stripe board | 80 millimeters |
| The voidage of individual layer grid packing | 99.38％ |
| The specific area of individual layer grid packing | 75 metre squared per cubic |
| The thickness of horizontally-arranged stripe board and tandem stripe board in each layer of grid packing | 2 millimeters |
| The height of individual layer grid packing | 150 millimeters |
| The height of wire packing | 100 millimeters |
| The voidage of wire packing | 97.88％ |
| The specific area of wire packing | 529.6 metre squared per cubic |
Claims (5)
1. a demister, be provided with wire packing (2), it is characterized in that: the below of wire packing (2) is provided with grid packing (3), grid packing (3) at least arranges 2 layers, each layer of grid packing (3) is all with the ramp way tilting with horizontal plane, by tilting with horizontal plane and cross one another horizontally-arranged stripe board (31) and tandem stripe board (32) formation, horizontally-arranged stripe board (31) between each layer of grid packing (3) is identical respectively with the length direction of tandem stripe board (32), wire packing (2) is disc with each layer of grid packing (3), upper and lower surface is plane, wire packing (2) is positioned on the upper surface of the superiors' grid packing (3), in each layer of grid packing (3), upper strata grid packing (3) is positioned on the upper surface of lower floor's grid packing (3), in neighbouring two-layer grid packing (3), ramp way is staggeredly arranged, horizontally-arranged stripe board (31) and tandem stripe board (32) incline direction is with respect to the horizontal plane contrary respectively.
2. demister according to claim 1, is characterized in that: grid packing (3) arranges 2～3 layers.
3. demister according to claim 1, it is characterized in that: horizontally-arranged stripe board (31) and tandem stripe board (32) in each layer of grid packing (3) are provided with purge hole (6), purge hole (6) comprises the bottom outlet (61) of being located at the planar shaped in horizontally-arranged stripe board (31) and tandem stripe board (32), the top of bottom outlet (61) is provided with top cover (62), top cover (62) is protruding to the top of horizontally-arranged stripe board (31) and tandem stripe board (32) upper surface respectively, bottom outlet (61) and top cover (62) respectively have a lower limb, between two lower limbs, form pore (63), bottom outlet (61) and remaining edge of top cover (62) interconnect.
4. according to the demister described in claim 1 or 2 or 3, it is characterized in that: in individual layer grid packing (3), angle β between horizontally-arranged stripe board (31) and horizontal plane is 30～85 degree, angle α between tandem stripe board (32) and horizontal plane is 30～85 degree, angle γ between horizontally-arranged stripe board (31) and tandem stripe board (32) is 20～90 degree, vertical range between vertical range between horizontally-arranged stripe board (31) and tandem stripe board (32) is 20～200 millimeters, the voidage of individual layer grid packing (3) is 99.0%～99.5%, specific area is 60～125 metre squared per cubic.
5. demister according to claim 4, is characterized in that: the height a of wire packing (2) is 50～100 millimeters, and the height b of individual layer grid packing (3) is 50～300 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306751.7A CN103623660B (en) | 2012-08-20 | 2012-08-20 | A kind of demister |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306751.7A CN103623660B (en) | 2012-08-20 | 2012-08-20 | A kind of demister |
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| Publication Number | Publication Date |
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| CN103623660A true CN103623660A (en) | 2014-03-12 |
| CN103623660B CN103623660B (en) | 2016-04-13 |
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| CN201210306751.7A Active CN103623660B (en) | 2012-08-20 | 2012-08-20 | A kind of demister |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104740968A (en) * | 2015-03-25 | 2015-07-01 | 云南亚太环境工程设计研究有限公司 | Super demisting apparatus |
| CN109055194A (en) * | 2018-08-15 | 2018-12-21 | 淄博三田化工装备有限公司 | A kind of mechanical defoaming slurry |
| CN109999568A (en) * | 2019-02-25 | 2019-07-12 | 杭州力久高分子材料科技有限公司 | Gas-liquid separator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201154263Y (en) * | 2007-10-18 | 2008-11-26 | 上海同特化工科技有限公司 | Guiding spray catcher |
| CN201959659U (en) * | 2011-01-10 | 2011-09-07 | 中国石油化工股份有限公司 | Demister |
| CN102527175A (en) * | 2010-12-16 | 2012-07-04 | 中国石油化工股份有限公司 | Dust catcher |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201154263Y (en) * | 2007-10-18 | 2008-11-26 | 上海同特化工科技有限公司 | Guiding spray catcher |
| CN102527175A (en) * | 2010-12-16 | 2012-07-04 | 中国石油化工股份有限公司 | Dust catcher |
| CN201959659U (en) * | 2011-01-10 | 2011-09-07 | 中国石油化工股份有限公司 | Demister |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104740968A (en) * | 2015-03-25 | 2015-07-01 | 云南亚太环境工程设计研究有限公司 | Super demisting apparatus |
| CN109055194A (en) * | 2018-08-15 | 2018-12-21 | 淄博三田化工装备有限公司 | A kind of mechanical defoaming slurry |
| CN109999568A (en) * | 2019-02-25 | 2019-07-12 | 杭州力久高分子材料科技有限公司 | Gas-liquid separator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103623660B (en) | 2016-04-13 |
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