CN104501533A - Powder drying system and method based on membrane method dust collecting technology - Google Patents
Powder drying system and method based on membrane method dust collecting technology Download PDFInfo
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- CN104501533A CN104501533A CN201410756509.9A CN201410756509A CN104501533A CN 104501533 A CN104501533 A CN 104501533A CN 201410756509 A CN201410756509 A CN 201410756509A CN 104501533 A CN104501533 A CN 104501533A
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
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- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 4
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- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 2
- 239000002028 Biomass Substances 0.000 claims description 2
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- JEVVKJMRZMXFBT-XWDZUXABSA-N Lycophyll Natural products OC/C(=C/CC/C(=C\C=C\C(=C/C=C/C(=C\C=C\C=C(/C=C/C=C(\C=C\C=C(/CC/C=C(/CO)\C)\C)/C)\C)/C)\C)/C)/C JEVVKJMRZMXFBT-XWDZUXABSA-N 0.000 claims description 2
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 2
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Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a powder drying system and a method based on a membrane method dust collecting technology. The powder drying system is formed by a convection dryer (I), a membrane method dust collecting device (II), an induced draft fan (III), an air blower (IV), a preheater (V) and a heat exchanger (VI), which are connected through a pipeline. The method comprises the following steps that a wet powder body (c) enters into the convection dryer (I); natural air (a) enters into the heat exchanger (VI) through the preheater (V) to form high-temperature air (f) and enters into the convection dryer (I) from the bottom part to dry the wet powder body; the dried finished powder body is discharged out of the convection dryer (I) after being cooled by cold air (m); gas (g) used for drying the powder body carries part of dust to enter into the membrane method dust collecting device (II) under the action of the induced draft fan (III); the dust is intercepted by a membrane to obtain a finished powder body (k), and high-temperature clean gas (j) penetrating through the membrane enters into the preheater (V) to preheat the air (a).
Description
Technical field
The present invention relates to a kind of system and method adopting the dry powder of embrane method dust collecting technique, particularly relate to a kind of comvection dryer embrane method dust collecting technique, the powder material drying being applicable to 0.1 ~ 100 μm is gathered dust, and belongs to dry dust collection device technical field.
Technical background
In wet stock dry run, utilize hot gas directly to contact as thermal source and wet stock the drying means removing wet stock contained humidity and be called convective drying, it is most widely used a kind of drying means.Comvection dryer is simple, easy to operate with its structure, strong adaptability and being applied at large, is to use maximum-kind of drying equipment in producing at present.
During comvection dryer drying powder, gas vent can take a large amount of dust out of.Dryer export dust concentration can reach 100g ~ 500g/m
3, if do not reclaimed this part dust, not only can cause serious waste, increasing production cost, and can to environment.Adopt cyclone separator or hydrofilter or the two to be combined separation in conventional drying processes and taken out of the dust of drier.The rate of recovery of cyclone separator to dust is lower, and the actual clearance of its dust only has about 80%, especially for the dust of particle diameter below 7 μm, is difficult to be recovered; Wet dedusting mainly uses water or other liquid to wash dusty gas, but this method can produce a large amount of waste water and dregs, to environment, after wet dedusting, gas temperature can be down to 50 ~ 80 DEG C, this portion gas institute heat content is difficult to be utilized, gas is directly emptying as waste gas, causes the huge waste of energy; Cyclone dust collection and wet dedusting are combined, and as shown in Figure 5, technological process is long, and cannot overcome wet dedusting reduction gas temperature, cause the shortcoming of energy loss.
Chinese patent application publication number CN201410342Y discloses a kind of fluid bed dryer bag type dust collection apparatus, after bag filter is directly placed in fluidized bed dryer by this utility model patent, operating procedure is not optimized, and the cloth bag that gathers dust is lower to small particle diameter dust clearance, small particle diameter dust enters air with waste gas, still can cause unnecessary waste and the pollution of environment.After the cloth bag that gathers dust runs certain hour, aperture is blocked by dust, and filtration resistance can sharply rise, and causes the increase of energy consumption, within about 1 year, just need change cloth bag, increase extra production cost.Chinese patent application publication number CN2733284Y discloses a kind of fluid bed dryer with built-in dust-precipitator, this utility model patent is provided with bagroom at the expanding reach of fluid bed dryer, dust arrester installation is placed in drier inside, although this device reduces the cumulative volume of drier and dust-precipitator, but it is low to overcome the cloth bag that gathers dust dust clearance own, duct easily blocks, the shortcoming that life-span is short, and bagroom is placed in fluidized bed drying inside, operation of gathering dust will have an impact to the fluidized state of powder, therefore drier and cloth bag parameter of gathering dust all need to match with production technology, this utility model patent does not all make related description.
Summary of the invention
The object of the invention is to take out of and removal problem in order to the dust solved in the dry powder process of comvection dryer, diffusion barrier is introduced drying system, utilize the dust rejection of diffusion barrier high, not easily block, the feature of life-span length removes the dust taking drier out of, EGT after adopting diffusion barrier to remove dust still can remain on more than 100 DEG C, recycles the heat in waste gas, reduces energy consumption.
Technical scheme of the present invention: a kind of powder drying system based on embrane method dust collecting technique, this drying system is by comvection dryer I, embrane method dust-precipitator II, air-introduced machine III, air blast IV, preheater V, heat exchanger VI forms, natural air inlet pipeline and preheater, after heat exchanger connects successively, be connected with the high-temperature gas import be arranged on bottom described comvection dryer, described comvection dryer is provided with wet powder import and the outlet of finished product powder, also cooling air inlet is provided with bottom this comvection dryer, top is provided with gas vent, described cooling air inlet place is provided with air blast, described embrane method dust-precipitator is made up of upper box 1, middle casing 2, card 3, ash bucket 4, membrane module 5, described upper box is positioned at the top of embrane method dust-precipitator, upper box has clean gas outlet 7 and purge gas entrance 8, described clean gas outlet is connected by pipeline with preheater, this pipeline is provided with air-introduced machine and lateral, and described lateral is connected with described purge gas entrance, described raising middle flask body is positioned at upper box bottom, and middle casing has dusty gas entrance 10, and this entrance is connected with the gas vent at comvection dryer top, described card is between upper box and middle casing, and described ash bucket is arranged in lower box, tapered, described membrane module is arranged in box house, hangs on card.Described heat exchanger is provided with water vapour import and steam outlet.
Wherein said embrane method dust collection powder soma drying system, comvection dryer kind comprises fluidized bed dryer, spray dryer, pneumatic conveyer dryer etc. and adopts thermal current and wet powder directly to contact the equipment carrying out drying, and its dry run can take part dust out of.Dried powder is the inorganic salts such as sodium sulphate, sodium carbonate, ammonium sulfate, purified salt, calcium chloride, ammonium nitrate, Diammonium phosphate (DAP), potash, copper sulphate; Or the organic compound such as adipic acid, vitamin, polystyrene, ABS plastic, crystal sugar, pentaerythrite, terephthalic acid (TPA), lysine; Or the biomass powder such as soy meal, starch, starch derivatives, sewage sludge, yeast, lycopene, milk powder.
Embrane method dust-precipitator can be divided into 2 ~ 8 bins, is separated between each bin by dividing plate, and dusty gas enters each storehouse respectively, and every two bins share an ash bucket; The gas outlet of each bin is provided with lift valve, and lift valve can carry out off-line operation to single bin after cutting out; Described upper box is equipped with purge gas nozzle, center, each nozzle alignment card hole; Described card bore dia 10 ~ 200mm, card hole centre-to-centre spacing 14 ~ 400mm; Described membrane module comprises inorganic separating film assembly and organic separation membrane assembly, and inorganic separating film assembly comprises inorganic separating film and sealing device; Organic separation membrane assembly comprises diffusion barrier and cage, and diffusion barrier is tubular, and one end seals, and top is that flexible steel ring is buckled on card, adopts cage to support.
Diffusion barrier has organic and inorganic two kinds, is double-decker, comprises supporting layer and rete, 50 ~ 100 μm, supporting layer aperture, 1 ~ 5 μm, rete aperture, thicknesses of layers 10 ~ 100 μm.Organic separation membrane thickness 0.4 ~ 5mm, its support layer material is glass fibre, polyester, polyphenylene sulfide, polyimides or polytetrafluoroethylene (PTFE), and film material is polytetrafluoroethylene (PTFE); Inoranic membrane thickness 3 ~ 20mm, material is pottery or metal, and ceramic material is aluminium oxide, zirconia or carborundum, and metal material is stainless steel, nickel, ferrochrome or titanium.
Based on a powder drying method for embrane method dust collecting technique, its step is as follows:
A) wet powder enters comvection dryer, and natural air enters heat exchanger after preheater preheats, adopts water vapour to heat further air and obtains high temperature air;
B) high temperature air enters comvection dryer by bottom, carries out drying to wet powder, after dried finished product powder is cooled by cooling-air, discharges comvection dryer and obtains finished product powder;
C) gas after dry powder carries part dust and enters embrane method dust-precipitator under air-introduced machine effect, and dust tunicle retains and obtains finished product powder, and the purifying high temperature gas through film enters preheater and carries out preheating to natural air.
Above-mentioned steps C) in dusty gas temperature 40 ~ 200 DEG C when entering embrane method dust-precipitator, during the separated membrane filtration of dusty gas, control single bin transmembrane pressure 100 ~ 1500Pa, total transmembrane pressure 200 ~ 2000Pa, control gas filtration speed 0.5 ~ 2.0m/min.
Embrane method dust-precipitator is equipped with off-line back-blowing device, after total transmembrane pressure reaches setting value or running time reaches setting value, the lift valve of bin cuts out, make single bin off-line, the clean gas through film is adopted to carry out pulse jet to each bin one by one, jetting pressure 0.2 ~ 0.5MPa, burst length 0.1 ~ 0.5s.
Diffusion barrier is introduced drying system by this embrane method dust collection powder soma drying system, utilize the dust rejection of diffusion barrier high, not easily block, the feature of life-span length reclaims the dust taking drier out of, whole technological process is simple, easy to operate, environmental pollution is few, and the EGT after adopting diffusion barrier to remove dust still can remain on more than 100 DEG C, recycles the heat in waste gas, reduce energy consumption, effectively save cost.
Accompanying drawing explanation
Fig. 1 is embrane method dust collection powder soma drying system of the present invention, wherein I-comvection dryer, II-embrane method dust-precipitator, III-air-introduced machine, IV-air blast, V-preheater, VI-heat exchanger.
Fig. 2 is embrane method dust-precipitator schematic diagram of the present invention, wherein casing, 3-card, 4-ash bucket, 5-membrane module, the outlet of 7-clean gas, 8-purge gas entrance, 9-purge gas nozzle, 10-dusty gas entrance in 1-upper box, 2-.
Fig. 3 is organic separation membrane assembly of the present invention, wherein 6-organic separation membrane, 12-cage.
Fig. 4 is embrane method dust-precipitator top view of the present invention, wherein 3-card, 5-membrane module, 11-dividing plate, 14-lift valve.
Fig. 5 is that drying that conventional cyclone combines with wet dust collector device is gathered dust technological process.
Fig. 6 is embrane method dust collection powder body drying technology process of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1: the dry dust collecting system of fluidized bed dryer glauber salt
The dry dust collecting system of fluidized bed dryer glauber salt, as shown in Figure 1, whole system is formed by fluidized bed dryer I, embrane method dust-precipitator II, air-introduced machine III, air blast IV, preheater V, heat exchanger VI, and is connected by stainless steel pipes; Wherein embrane method dust-precipitator II is made up of upper box 1, middle casing 2, card 3, ash bucket 4, membrane module 5, sees Fig. 2.Described upper box 1 is positioned at the top of embrane method dust-precipitator II, and Main Function is collect the clean gas through diffusion barrier; Upper box has clean gas outlet 7 and purge gas entrance 8; Described middle casing 2 is positioned at upper box 1 bottom, and middle casing 2 has dusty gas entrance 10; Described card 3, between upper box 1 and middle casing 2, plays the supporting role to membrane module 5; Described ash bucket 4 is arranged in casing 2 bottom, tapered, the powder under collection tunicle retains; It is inner that described membrane module 5 is arranged in casing 2, hangs on card 3.
Embrane method dust-precipitator II is divided into 2 bins, and as shown in Figure 3,4, separated between bin by dividing plate 11, dusty gas g enters each storehouse respectively, and two bins share an ash bucket 4; The gas outlet of each bin is provided with lift valve 14, and lift valve 14 can carry out off-line operation to single bin after cutting out; Described upper box 1 is equipped with purge gas nozzle 9, center, each nozzle alignment card hole; Described card bore dia 100mm, card hole centre-to-centre spacing 240mm; Organic film assembly 5 comprises organic separation membrane 6 and cage 12, and organic separation membrane 6 is in tubular, and one end seals, and diameter 100mm, top is that flexible steel ring can be buckled on card 3, and diffusion barrier 6 adopts cage 12 to support.Diffusion barrier thickness 0.4mm is double-decker, comprises supporting layer and rete, and its support layer material is glass fibre, and film material is polytetrafluoroethylene (PTFE).50 μm, supporting layer aperture, 1 μm, rete aperture, thicknesses of layers 10 μm.
Fig. 6 shows embrane method dust collection powder body drying technology process of the present invention.Wet glauber salt c enters fluidized bed dryer I, and natural air a enters heat exchanger VI after preheater V preheating, adopts water vapour b to heat further air and obtains high temperature air f; High temperature air f enters fluidized bed dryer I by bottom, carries out drying to wet powder, after dried finished product powder is cooled by cooling-air m, discharges fluidized bed dryer I and obtains finished product glauber salt n;
Gas g after dry glauber salt carries part dust and enters embrane method dust-precipitator II under air-introduced machine III acts on, and dust tunicle retains and obtains finished product powder k, and the purifying high temperature gas through film enters preheater V couple of natural air a and carries out preheating.Temperature 40 DEG C when dusty gas enters embrane method dust-precipitator, when dusty gas filters, controls single bin transmembrane pressure 100Pa, total transmembrane pressure 200Pa, controls gas filtration speed 0.5m/min.Embrane method dust-precipitator II is equipped with off-line back-blowing device, after total transmembrane pressure reaches setting value or running time reaches setting value, the lift valve 14 of bin cuts out, make single bin off-line, the clean gas through film is adopted to carry out pulse jet to each bin one by one, jetting pressure 0.2MPa, burst length 0.1s.In the present embodiment, diffusion barrier is 99.99% to the rejection of glauber salt, and EGT 30 DEG C after gathering dust, natural air can be risen to 25 DEG C by temperature after heating by the exhaust gases.
Embodiment 2: the dry dust collecting system of pneumatic conveyer dryer ABS plastic
The dry dust collecting system of pneumatic conveyer dryer ABS plastic is formed by pneumatic conveyer dryer I, embrane method dust-precipitator II, air-introduced machine III, air blast IV, preheater V, heat exchanger VI, and is connected by stainless steel pipes; Wherein embrane method dust-precipitator II is made up of upper box 1, middle casing 2, card 3, ash bucket 4, membrane module 5.Described upper box 1 is positioned at the top of embrane method dust-precipitator II, and Main Function is collect the clean gas through diffusion barrier; Upper box has clean gas outlet 7 and purge gas entrance 8; Described middle casing 2 is positioned at upper box 1 bottom, and middle casing 2 has dusty gas entrance 10; Described card 3, between upper box 1 and middle casing 2, plays the supporting role to membrane module 5; Described ash bucket 4 is arranged in casing 2 bottom, tapered, the powder under collection tunicle retains; It is inner that described membrane module 5 is arranged in casing 2, hangs on card 3.Embrane method dust-precipitator II can be divided into 4 bins, is separated between each bin by dividing plate 11, and dusty gas g enters each storehouse respectively, and every two bins share an ash bucket 4; The gas outlet of each bin is provided with lift valve 14, and lift valve 14 can carry out off-line operation to single bin after cutting out; Described upper box 1 is equipped with purge gas nozzle 9, center, each nozzle alignment card hole; Described card bore dia 200mm, card hole centre-to-centre spacing 400mm; Membrane module 5 comprises organic separation membrane 6 and cage 12, and diffusion barrier is tubular, and one end seals, and top is that flexible steel ring can be buckled on card, and diffusion barrier adopts cage to support.Diffusion barrier thickness 2mm is double-decker, comprises supporting layer and rete, and its support layer material is polyester film material is polytetrafluoroethylene (PTFE).80 μm, supporting layer aperture, 2 μm, rete aperture, thickness 50 μm.
Wet ABS plastic c enters pneumatic conveyer dryer I, and natural air a enters heat exchanger VI after preheater V preheating, adopts water vapour b to heat further air and obtains high temperature air f;
High temperature air f enters comvection dryer I by bottom, carries out drying to wet powder, after dried finished product ABS plastic is cooled by cooling-air m, discharges pneumatic conveyer dryer I and obtains finished product ABS plastic powder n;
Gas g after dry powder carries part dust and enters embrane method dust-precipitator II under air-introduced machine III acts on, and ABS plastic dust tunicle retains and obtains finished product ABS powder k, and the purifying high temperature gas through film enters preheater V couple of natural air a and carries out preheating.
Temperature 130 DEG C when dusty gas enters embrane method dust-precipitator, during the separated membrane filtration of dusty gas, controls single bin transmembrane pressure 500Pa, total transmembrane pressure 600Pa, controls gas filtration speed 0.8m/min.
Embrane method dust-precipitator II is equipped with off-line back-blowing device, after total transmembrane pressure reaches setting value or running time reaches setting value, the lift valve of bin cuts out, make single bin off-line, the clean gas through film is adopted to carry out pulse jet to each bin one by one, jetting pressure 0.35MPa, burst length 0.3s.In the present embodiment, diffusion barrier is 99.99% to ABS plastic dust rejection, and EGT 110 DEG C after gathering dust, natural air can be risen to 75 DEG C by temperature after heating by the exhaust gases.
Embodiment 3: spray dryer drying of milk powder dust collecting system
Spray dryer drying of milk powder dust collecting system, is formed by spray dryer I, embrane method dust-precipitator II, air-introduced machine III, air blast IV, preheater V, heat exchanger VI, and is connected by stainless steel pipes; Wherein embrane method dust-precipitator II is made up of upper box 1, middle casing 2, card 3, ash bucket 4, membrane module 5.Described upper box 1 is positioned at the top of embrane method dust-precipitator II, and Main Function is collect the clean gas through diffusion barrier; Upper box has clean gas outlet 7 and purge gas entrance 8; Described middle casing 2 is positioned at upper box 1 bottom, and middle casing 2 has dusty gas entrance; Described card 3, between upper box 1 and middle casing 2, plays the supporting role to membrane module 5; Described ash bucket 4 is arranged in casing 2 bottom, tapered, the powder under collection tunicle retains; It is inner that described membrane module 5 is arranged in casing 2, hangs on card 3.Embrane method dust-precipitator II is divided into 8 bins, is separated between each bin by dividing plate 11, and dusty gas g enters each bin respectively, and every two bins share an ash bucket 4; The gas outlet of each bin is provided with lift valve 14, and lift valve 14 can carry out off-line operation to single bin after cutting out; Described upper box 1 is equipped with purge gas nozzle 9, center, each nozzle alignment card hole; Described card bore dia 300mm, card hole centre-to-centre spacing 300mm; Described membrane module 5 comprises diffusion barrier and cage, and diffusion barrier is tubular, and one end seals, diameter 400mm, and top is that flexible steel ring can be buckled on card, and diffusion barrier adopts cage to support.Diffusion barrier thickness 5mm is double-decker, comprises supporting layer and rete, and its support layer material is polyester, and film material is polytetrafluoroethylene (PTFE).100 μm, supporting layer aperture, 5 μm, rete aperture, thicknesses of layers 100 μm.
Milk powder slurries c enters spray dryer I, and natural air a enters heat exchanger VI after preheater V preheating, adopts water vapour b to heat further air and obtains high temperature air f;
High temperature air f enters comvection dryer I by bottom, carries out drying to wet powder, after dried finished product powder is cooled by cooling-air m, discharges spray dryer I and obtains finished product milk powder n;
Gas g after drying powdered milk carries part milk powder and enters embrane method dust-precipitator II under air-introduced machine III acts on, and milk powder tunicle retains and obtains finished product milk powder k, and the purifying high temperature gas j through film enters preheater V couple of natural air a and carries out preheating.Temperature 150 DEG C when dusty gas enters embrane method dust-precipitator, during the separated membrane filtration of dusty gas, controls single bin transmembrane pressure 800Pa, total transmembrane pressure 1000Pa, controls gas filtration speed 1.0m/min.Embrane method dust-precipitator II is equipped with off-line back-blowing device, after total transmembrane pressure reaches setting value or running time reaches setting value, the lift valve 14 of bin cuts out, make single bin off-line, the clean gas through film is adopted to carry out pulse jet to each bin one by one, jetting pressure 0.5MPa, burst length 0.5s.In the present embodiment, diffusion barrier is 99.999% to milk powder rejection, and EGT 120 DEG C after gathering dust, natural air can be risen to 80 DEG C by temperature after heating by the exhaust gases.
Embodiment 4: the dry dust collecting system of fluidized bed dryer calcium chloride
The dry dust collecting system of fluidized bed dryer calcium chloride, as shown in Figure 1, whole system is formed by fluidized bed dryer I, embrane method dust-precipitator II, air-introduced machine III, air blast IV, preheater V, heat exchanger VI, and is connected by stainless steel pipes; Wherein embrane method dust-precipitator II is made up of upper box 1, middle casing 2, card 3, ash bucket 4, membrane module 5, sees Fig. 2.Described upper box 1 is positioned at the top of embrane method dust-precipitator II, and Main Function is collect the clean gas through diffusion barrier; Upper box has clean gas outlet 7 and purge gas entrance 8; Described middle casing 2 is positioned at upper box 1 bottom, and middle casing 2 has dusty gas entrance 10; Described card 3, between upper box 1 and middle casing 2, plays the supporting role to membrane module 5; Described ash bucket 4 is arranged in casing 2 bottom, tapered, the powder under collection tunicle retains; It is inner that described membrane module 5 is arranged in casing 2, hangs on card 3.
Embrane method dust-precipitator II is divided into 4 bins, and as shown in Figure 3,4, separated between bin by dividing plate 11, dusty gas g enters each storehouse respectively, and two bins share an ash bucket 4; The gas outlet of each bin is provided with lift valve 14, and lift valve 14 can carry out off-line operation to single bin after cutting out; Described upper box 1 is equipped with purge gas nozzle 9, center, each nozzle alignment card hole; Described card bore dia 10mm, card hole centre-to-centre spacing 14mm; Diffusion barrier thickness 0.4mm is double-decker, comprises supporting layer and rete, and its support layer material is carborundum, and film material is aluminium oxide.50 μm, supporting layer aperture, 1 μm, rete aperture, thicknesses of layers 10 μm.
Fig. 6 shows embrane method dust collection powder body drying technology process of the present invention.Wet calcium chloride c enters fluidized bed dryer I, and natural air a enters heat exchanger VI after preheater V preheating, adopts water vapour b to heat further air and obtains high temperature air f; High temperature air f enters fluidized bed dryer I by bottom, carries out drying to wet powder, after dried finished product powder is cooled by cooling-air m, discharges fluidized bed dryer I and obtains finished product calcium chloride n;
Gas g after dry calcium chloride carries part dust and enters embrane method dust-precipitator II under air-introduced machine III acts on, and dust tunicle retains and obtains finished product powder k, and the purifying high temperature gas through film enters preheater V couple of natural air a and carries out preheating.Temperature 200 DEG C when dusty gas enters embrane method dust-precipitator, when dusty gas filters, controls single bin transmembrane pressure 1500Pa, total transmembrane pressure 2000Pa, controls gas filtration speed 2m/min.Embrane method dust-precipitator II is equipped with off-line back-blowing device, after total transmembrane pressure reaches setting value or running time reaches setting value, the lift valve 14 of bin cuts out, make single bin off-line, the clean gas through film is adopted to carry out pulse jet to each bin one by one, jetting pressure 0.5MPa, burst length 0.1s.In the present embodiment, diffusion barrier is 99.999% to the rejection of calcium chloride, and EGT 140 DEG C after gathering dust, natural air can be risen to 100 DEG C by temperature after heating by the exhaust gases.
Claims (8)
1. the powder drying system based on embrane method dust collecting technique, it is characterized in that, this drying system is by comvection dryer (I), embrane method dust-precipitator (II), air-introduced machine (III), air blast (IV), preheater (V), heat exchanger (VI) forms, natural air inlet pipeline and preheater, after heat exchanger connects successively, be connected with the high-temperature gas import be located at bottom described comvection dryer, described comvection dryer is provided with wet powder import and the outlet of finished product powder, also cooling air inlet is provided with bottom this comvection dryer, top is provided with gas vent, described cooling air inlet place is provided with air blast, described embrane method dust-precipitator is made up of upper box (1), middle casing (2), card (3), ash bucket (4), membrane module (5), described upper box is positioned at the top of embrane method dust-precipitator, upper box has clean gas outlet (7) and purge gas entrance (8), described clean gas outlet is connected by pipeline with preheater, this pipeline is provided with air-introduced machine and lateral, and described lateral is connected with described purge gas entrance, described raising middle flask body is positioned at upper box bottom, and middle casing has dusty gas entrance (10), and this entrance is connected with the gas vent at comvection dryer top, described card is between upper box and middle casing, and described ash bucket is arranged in lower box, tapered, described membrane module is arranged in box house, hangs on card.
2. the powder drying system based on embrane method dust collecting technique according to claim 1, it is characterized in that comvection dryer (I) is adopt thermal current and wet powder directly to contact to carry out dry equipment, comprise fluidized bed dryer, spray dryer, pneumatic conveyer dryer; Dried powder is inorganic salts, comprises glauber salt, sodium carbonate, ammonium sulfate, purified salt, calcium chloride, ammonium nitrate, Diammonium phosphate (DAP), potash, copper sulphate; Or organic compound, comprise adipic acid, vitamin, polystyrene, ABS plastic, crystal sugar, pentaerythrite, terephthalic acid (TPA), lysine; Or biomass powder, comprise soy meal, starch, starch derivatives, sewage sludge, yeast, lycopene, milk powder.
3. the powder drying system based on embrane method dust collecting technique according to claim 1, it is characterized in that described embrane method dust-precipitator (II) can be divided into 2 ~ 8 bins, separated by dividing plate (11) between each bin, dusty gas (g) enters each storehouse respectively, and every two bins share an ash bucket (4); The gas outlet of each bin is provided with lift valve (14), and lift valve (14) can carry out off-line operation to single bin after cutting out; Described upper box (1) is equipped with purge gas nozzle (9), center, each nozzle alignment card hole; Described card bore dia 10 ~ 200mm, card hole centre-to-centre spacing 14 ~ 400mm; Described membrane module (5) comprises inorganic separating film assembly and organic separation membrane assembly, and inorganic separating film assembly comprises inorganic separating film and sealing device; Organic separation membrane assembly comprises organic separation membrane (6) and cage (12), and diffusion barrier is tubular, and one end seals, and organic separation membrane top is that flexible steel ring is buckled on card, adopts cage to support.
4. the powder drying system based on embrane method dust collecting technique according to claim 3, it is characterized in that described diffusion barrier mainly contains organic and inorganic two kinds, for double-decker, comprise supporting layer and rete, 50 ~ 100 μm, supporting layer aperture, 1 ~ 5 μm, rete aperture, thicknesses of layers 10 ~ 100 μm, organic separation membrane thickness 0.4 ~ 5mm, its support layer material is glass fibre, polyester, polyphenylene sulfide, polyimides or polytetrafluoroethylene (PTFE), and film material is polytetrafluoroethylene (PTFE); Inoranic membrane thickness 3 ~ 20mm, material is pottery or metal, and ceramic material is aluminium oxide, zirconia or carborundum, and metal material is stainless steel, nickel, ferrochrome or titanium.
5. the powder drying system based on embrane method dust collecting technique according to claim 1, it is characterized in that, described heat exchanger is provided with water vapour import and steam outlet.
6. utilize the system described in claim 1 to carry out the method for powder drying, its step is as follows:
A) wet powder (c) enters comvection dryer (I), and natural air (a) enters heat exchanger (VI) after preheater (V) preheating, adopts water vapour (b) to heat further air and obtains high temperature air (f);
B) high temperature air (f) enters comvection dryer (I) by bottom, carries out drying to wet powder, after dried finished product powder is cooled by cooling-air (m), discharges comvection dryer (I) and obtains finished product powder (n);
C) gas (g) after dry powder carries part dust and enters embrane method dust-precipitator (II) under air-introduced machine (III) effect, dust tunicle retains and obtains finished product powder (k), and high temperature clean gas (j) through film enters preheater (V) and carries out preheating to natural air (a).
7. powder drying method according to claim 6, temperature 40 ~ 200 DEG C when to it is characterized in that in step (C) that dusty gas enters embrane method dust-precipitator, when the separated film of dusty gas (6) filters, control single bin transmembrane pressure 100 ~ 1500Pa, total transmembrane pressure 200 ~ 2000Pa, controls gas filtration speed 0.5 ~ 2.0m/min.
8. drying means according to claim 6, it is characterized in that embrane method dust-precipitator (II) is equipped with off-line back-blowing device, after total transmembrane pressure reaches setting value or running time reaches setting value, the lift valve (14) of bin cuts out, make single bin off-line, the clean gas through film is adopted to carry out pulse jet to each bin one by one, jetting pressure 0.2 ~ 0.5MPa, burst length 0.1 ~ 0.5s.
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| CN110822880A (en) * | 2019-11-21 | 2020-02-21 | 楚天科技股份有限公司 | Fuzzy control method and system for temperature of fluidized bed product and fluidized bed system |
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