CN104501533B - A kind of powder drying system and method based on embrane method dust collecting technique - Google Patents
A kind of powder drying system and method based on embrane method dust collecting technique Download PDFInfo
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Abstract
The present invention relates to a kind of powder drying system and method based on embrane method dust collecting technique, this powder drying system is formed by comvection dryer (I), embrane method dust-precipitator (II), air-introduced machine (III), aerator (IV), preheater (V), heat exchanger (VI), and is attached by pipeline.Its step comprises: wet powder (c) enters comvection dryer (I), natural air (a) enters heat exchanger (VI) after preheater (V) preheats, become high temperature air (f), comvection dryer (I) is entered again by bottom, wet powder is dried, after dried finished product powder body is by cooling down air (m) cooling, discharge comvection dryer (I)；It is dried the gas (g) after powder body under air-introduced machine (III) acts on, carries part dust entrance embrane method dust-precipitator (II), dust is rejected by obtaining finished product powder body (k), and air (a) is preheated by high temperature clean gas (j) entrance preheater (V) through film.
Description
Technical field
The present invention relates to a kind of system and method using embrane method dust collecting technique to be dried powder body, particularly relate to a kind of comvection dryer embrane method dust collecting technique, it is adaptable to the powder material of 0.1～100 μm is dried and gathers dust, and belongs to dry dust collection device technical field.
Technical background
In wet stock dry run, utilize hot gas as thermal source with wet stock directly contact remove wet stock contained humidity drying means be referred to as convective drying, it is most widely used a kind of drying means.Comvection dryer is applied at large with its simple in construction, easy to operate, strong adaptability, is to use most kind drying equipments in production at present.
When comvection dryer is dried powder body, gas outlet can take a large amount of dust out of.Dryer export dust concentration is up to 100g～500g/m3, if this part dust not reclaimed, not only can cause serious waste, increase production cost, and can be to environment.Conventional drying processes uses cyclone separator or hydrofilter or the two be used in combination and separate the dust being carried over exsiccator.Cyclone separator is relatively low to the response rate of dust, and the actual clearance of its dust only has about 80%, particularly with particle diameter dust 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 directly empties as waste gas, causes the huge waste of energy；Cyclone dust collection and wet dedusting are used in combination, as it is shown in figure 5, technological process is long, and wet dedusting cannot be overcome to reduce gas temperature, the shortcoming causing energy loss.
Chinese patent application publication number CN201410342Y discloses a kind of fluid bed dryer bag filter device, after bag filter is placed directly within fluidized bed dryer by this utility model patent, operating procedure is not optimized, and the cloth bag that gathers dust is relatively low to small particle dust clearance, small particle dust enters air with waste gas, still can cause the pollution of unnecessary waste and environment.After the cloth bag that gathers dust runs certain time, aperture is blocked by dust, and filtration resistance can steeply rise, and causes the increase of energy consumption, within about 1 year, just need to be replaced 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 inside exsiccator, although this device reduces the cumulative volume of exsiccator and dust-precipitator, but the cloth bag that gathers dust dust clearance own cannot be overcome low, duct easily blocks, the shortcoming that life-span is short, and bagroom is placed in inside fluid bed drying, operation of gathering dust will produce impact to the fluidized state of powder body, therefore exsiccator and cloth bag parameter of gathering dust are required to match with production technology, this utility model patent does not all make related description.
Summary of the invention
The invention aims to solve the dust that comvection dryer is dried during powder body take out of and removal problem, film will be separated and introduce drying system, utilize the dust rejection separating film high, it is not easily blocked, the feature of life-span length removes the dust taking exsiccator out of, EGT after using separation film to remove chalk dust removing still may remain in more than 100 DEG C, recycles the heat in waste gas, reduces energy consumption.
Technical scheme: 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, aerator IV, preheater V, heat exchanger VI forms, natural air inlet pipeline and preheater, after heat exchanger is sequentially connected with, it is connected with the high-temperature gas import being arranged on bottom described comvection dryer, described comvection dryer is provided with wet powder import and the outlet of finished product powder body, it is additionally provided with cooling air inlet bottom this comvection dryer, top is provided with gas outlet, it is provided with aerator at described cooling air inlet；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, the outlet of described clean gas 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 outlet at comvection dryer top；Described card is between upper box and middle casing, and described ash bucket is positioned at middle lower box, tapered；Described membrane module is positioned at middle 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 includes that fluidized bed dryer, spray dryer, pneumatic conveyer dryer etc. use thermal current directly to contact the equipment being dried with wet powder, and its dry run can take part dust out of.The powder body being dried is the inorganic salts such as sodium sulfate, sodium carbonate, ammonium sulfate, purified salt, calcium chloride, ammonium nitrate, Diammonium phosphate (DAP), potassium carbonate, copper sulfate；Or the organic compound such as adipic acid, vitamin, polystyrene, ABS plastic, crystal sugar, tetramethylolmethane, p-phthalic acid, lysine；Or the biomass powder such as Semen sojae atricolor powder, starch, starch derivatives, sewage sludge, yeast, lycopene, milk powder.
Embrane method dust-precipitator can be divided into 2～8 bins, is separated by dividing plate between each bin, and dusty gas respectively enters each storehouse, and each two bin shares an ash bucket；The gas outlet of each bin is provided with lifting valve, promotes after valve cuts out and single bin can be carried out off-line operation；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 includes inorganic separating film assembly and organic separation membrane assembly, and inorganic separating film assembly includes inorganic separating film and sealing device；Organic separation membrane assembly includes separating film and cage, and separating film is tubular, and one end seals, and top is that flexible steel ring is buckled on card, uses cage to be supported.
Separate film and have organic and inorganic two kinds, for double-decker, including supporting layer and film layer, supporting layer aperture 50～100 μm, film layer aperture 1～5 μm, 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 politef, and film material is politef；Inoranic membrane thickness 3～20mm, material is pottery or metal, and ceramic material is aluminium oxide, zirconium oxide or carborundum, and metal material is rustless steel, nickel, ferrochrome or titanium.
A kind of powder drying method based on 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, and uses water vapour heating further to air to obtain high temperature air；
B) high temperature air is entered comvection dryer by bottom, is dried wet powder, after dried finished product powder body is by cooling down air cooling, discharges comvection dryer and obtains finished product powder body；
C) gas after being dried powder body carries part dust under air-introduced machine effect and enters embrane method dust-precipitator, and dust is rejected by obtaining finished product powder body, and natural air is preheated by the purifying high temperature gas entrance preheater through film.
Above-mentioned steps C) in dusty gas temperature 40～200 DEG C when entering embrane method dust-precipitator, when dusty gas is separated membrane filtration, 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 the operation time reaches setting value, the lifting valve of bin cuts out, make single bin off-line, the clean gas through film is used one by one each bin to be carried out pulse jet, jetting pressure 0.2～0.5MPa, the burst length 0.1～0.5s.
This embrane method dust collection powder soma drying system will separate film and introduce drying system, utilize the dust rejection separating film high, it is not easily blocked, the feature of life-span length reclaims the dust taking exsiccator out of, whole technological process is simple and convenient to operate, environmental pollution is few, and the EGT after using separation film to remove chalk dust removing still may remain in more than 100 DEG C, recycles the heat in waste gas, reduce energy consumption, be effectively saved 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-aerator, 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, and wherein 3-card, 5-membrane module, 11-dividing plate, 14-promote valve.
Fig. 5 is the dry technological process of gathering dust that conventional cyclone combines with wet dust collector device.
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: fluidized bed dryer Matrii Sulfas Exsiccatus is dried dust collecting system
Fluidized bed dryer Matrii Sulfas Exsiccatus is dried dust collecting system, as it is shown in figure 1, whole system is formed by fluidized bed dryer I, embrane method dust-precipitator II, air-introduced machine III, aerator IV, preheater V, heat exchanger VI, and is attached 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, primarily serves the purpose of the clean gas collected through separating film；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 positioned at middle casing 2 bottom, tapered, collects the powder body under being rejected by；It is internal that described membrane module 5 is positioned at middle casing 2, hangs on card 3.
Embrane method dust-precipitator II is divided into 2 bins, as shown in Figure 3,4, is separated by dividing plate 11 between bin, and dusty gas g respectively enters each storehouse, and two bins share an ash bucket 4；The gas outlet of each bin is provided with lifting valve 14, promotes after valve 14 cuts out and single bin can be carried out off-line operation；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 membrane assembly 5 includes organic separation membrane 6 and cage 12, and organic separation membrane 6 is in tubular, and one end seals, diameter 100mm, and top is that flexible steel ring can be buckled on card 3, separates film 6 and uses cage 12 to be supported.Separating film thickness 0.4mm, for double-decker, including supporting layer and film layer, its support layer material is glass fibre, and film material is politef.Supporting layer aperture 50 μm, film layer aperture 1 μm, thicknesses of layers 10 μm.
Fig. 6 shows embrane method dust collection powder body drying technology process of the present invention.Wet Matrii Sulfas Exsiccatus c enters fluidized bed dryer I, and natural air a enters heat exchanger VI after preheater V preheats, and uses water vapour b heating further to air to obtain high temperature air f；High temperature air f is entered fluidized bed dryer I by bottom, is dried wet powder, after dried finished product powder body is by cooling down air m cooling, discharges fluidized bed dryer I and obtains finished product Matrii Sulfas Exsiccatus n；
Being dried the gas g after Matrii Sulfas Exsiccatus and carry part dust entrance embrane method dust-precipitator II under air-introduced machine III acts on, dust is rejected by obtaining finished product powder body k, and natural air a is preheated by the purifying high temperature gas entrance preheater V through film.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 the operation time reaches setting value, the lifting valve 14 of bin cuts out, make single bin off-line, the clean gas through film is used one by one each bin to be carried out pulse jet, jetting pressure 0.2MPa, burst length 0.1s.In the present embodiment, separation film is 99.99% to the rejection of Matrii Sulfas Exsiccatus, 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: pneumatic conveyer dryer ABS plastic is dried dust collecting system
Pneumatic conveyer dryer ABS plastic is dried dust collecting system and is formed by pneumatic conveyer dryer I, embrane method dust-precipitator II, air-introduced machine III, aerator IV, preheater V, heat exchanger VI, and be attached 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, primarily serves the purpose of the clean gas collected through separating film；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 positioned at middle casing 2 bottom, tapered, collects the powder body under being rejected by；It is internal that described membrane module 5 is positioned at middle casing 2, hangs on card 3.Embrane method dust-precipitator II can be divided into 4 bins, is separated by dividing plate 11 between each bin, and dusty gas g respectively enters each storehouse, and each two bin shares an ash bucket 4；The gas outlet of each bin is provided with lifting valve 14, promotes after valve 14 cuts out and single bin can be carried out off-line operation；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 includes organic separation membrane 6 and cage 12, and separating film is tubular, and one end seals, and top is that flexible steel ring can be buckled on card, separates film and uses cage to be supported.Separate film thickness 2mm, for double-decker, including supporting layer and film layer, its support layer material be polyester film material be politef.Supporting layer aperture 80 μm, film layer aperture 2 μm, thickness 50 μm.
Wet ABS plastic c enters pneumatic conveyer dryer I, and natural air a enters heat exchanger VI after preheater V preheats, and uses water vapour b heating further to air to obtain high temperature air f；
High temperature air f is entered comvection dryer I by bottom, is dried wet powder, after dried finished product ABS plastic is by cooling down air m cooling, discharges pneumatic conveyer dryer I and obtains finished product ABS plastic powder body n；
Being dried the gas g after powder body and carry part dust entrance embrane method dust-precipitator II under air-introduced machine III acts on, ABS plastic dust is rejected by obtaining finished product ABS powder k, and natural air a is preheated by the purifying high temperature gas entrance preheater V through film.
Temperature 130 DEG C when dusty gas enters embrane method dust-precipitator, when dusty gas is separated membrane filtration, 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 the operation time reaches setting value, the lifting valve of bin cuts out, make single bin off-line, the clean gas through film is used one by one each bin to be carried out pulse jet, jetting pressure 0.35MPa, burst length 0.3s.Separating film in the present embodiment 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, aerator IV, preheater V, heat exchanger VI, and is attached 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, primarily serves the purpose of the clean gas collected through separating film；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 positioned at middle casing 2 bottom, tapered, collects the powder body under being rejected by；It is internal that described membrane module 5 is positioned at middle casing 2, hangs on card 3.Embrane method dust-precipitator II is divided into 8 bins, is separated by dividing plate 11 between each bin, and dusty gas g respectively enters each bin, and each two bin shares an ash bucket 4；The gas outlet of each bin is provided with lifting valve 14, promotes after valve 14 cuts out and single bin can be carried out off-line operation；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 includes separating film and cage, and separating film is tubular, and one end seals, diameter 400mm, and top is that flexible steel ring can be buckled on card, separates film and uses cage to be supported.Separating film thickness 5mm, for double-decker, including supporting layer and film layer, its support layer material is polyester, and film material is politef.Supporting layer aperture 100 μm, film layer aperture 5 μm, thicknesses of layers 100 μm.
Milk powder serosity c enters spray dryer I, and natural air a enters heat exchanger VI after preheater V preheats, and uses water vapour b heating further to air to obtain high temperature air f；
High temperature air f is entered comvection dryer I by bottom, is dried wet powder, after dried finished product powder body is by cooling down air m cooling, discharges spray dryer I and obtains finished product milk powder n；
Gas g after drying powdered milk carries part milk powder under air-introduced machine III acts on and enters embrane method dust-precipitator II, and milk powder is rejected by obtaining finished product milk powder k, and natural air a is preheated by the purifying high temperature gas j entrance preheater V through film.Temperature 150 DEG C when dusty gas enters embrane method dust-precipitator, when dusty gas is separated membrane filtration, 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 the operation time reaches setting value, the lifting valve 14 of bin cuts out, make single bin off-line, the clean gas through film is used one by one each bin to be carried out pulse jet, jetting pressure 0.5MPa, burst length 0.5s.Separating film in the present embodiment 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: fluidized bed dryer calcium chloride is dried dust collecting system
Fluidized bed dryer calcium chloride is dried dust collecting system, as it is shown in figure 1, whole system is formed by fluidized bed dryer I, embrane method dust-precipitator II, air-introduced machine III, aerator IV, preheater V, heat exchanger VI, and is attached 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, primarily serves the purpose of the clean gas collected through separating film；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 positioned at middle casing 2 bottom, tapered, collects the powder body under being rejected by；It is internal that described membrane module 5 is positioned at middle casing 2, hangs on card 3.
Embrane method dust-precipitator II is divided into 4 bins, as shown in Figure 3,4, is separated by dividing plate 11 between bin, and dusty gas g respectively enters each storehouse, and two bins share an ash bucket 4；The gas outlet of each bin is provided with lifting valve 14, promotes after valve 14 cuts out and single bin can be carried out off-line operation；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；Separating film thickness 0.4mm, for double-decker, including supporting layer and film layer, its support layer material is carborundum, and film material is aluminium oxide.Supporting layer aperture 50 μm, film layer aperture 1 μm, 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 preheats, and uses water vapour b heating further to air to obtain high temperature air f；High temperature air f is entered fluidized bed dryer I by bottom, is dried wet powder, after dried finished product powder body is by cooling down air m cooling, discharges fluidized bed dryer I and obtains finished product calcium chloride n；
Being dried the gas g after calcium chloride and carry part dust entrance embrane method dust-precipitator II under air-introduced machine III acts on, dust is rejected by obtaining finished product powder body k, and natural air a is preheated by the purifying high temperature gas entrance preheater V through film.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 the operation time reaches setting value, the lifting valve 14 of bin cuts out, make single bin off-line, the clean gas through film is used one by one each bin to be carried out pulse jet, jetting pressure 0.5MPa, burst length 0.1s.In the present embodiment, separation film 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 (6)
1. a 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), aerator (IV), preheater (V), heat exchanger (VI) forms, natural air inlet pipeline and preheater, after heat exchanger is sequentially connected with, it is connected with the high-temperature gas import being located at bottom described comvection dryer, described comvection dryer is provided with wet powder import and the outlet of finished product powder body, it is additionally provided with cooling air inlet bottom this comvection dryer, top is provided with gas outlet, it is provided with aerator at described cooling air inlet；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), the outlet of described clean gas 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 outlet at comvection dryer top；Described card is between upper box and middle casing, and described ash bucket is positioned at middle lower box, tapered；Described membrane module is positioned at middle box house, hangs on card；
Described embrane method dust-precipitator (II) is divided into 2～8 bins, is separated by dividing plate (11) between each bin, and dusty gas (g) respectively enters each storehouse, and each two bin shares an ash bucket (4)；The gas outlet of each bin is provided with lifting valve (14), promotes after valve (14) cuts out and single bin can be carried out off-line operation；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) includes inorganic separating film assembly and organic separation membrane assembly, and inorganic separating film assembly includes inorganic separating film and sealing device；Organic separation membrane assembly includes organic separation membrane (6) and cage (12), and separating film is tubular, and one end seals, and organic separation membrane top is that flexible steel ring is buckled on card, uses cage to be supported；
Described separation film has organic and inorganic two kinds, for double-decker, including supporting layer and film layer, supporting layer aperture 50～100 μm, film layer aperture 1～5 μm, 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 politef, and film material is politef；Inoranic membrane thickness 3～20mm, material is pottery or metal, and ceramic material is aluminium oxide, zirconium oxide or carborundum, and metal material is rustless steel, nickel, ferrochrome or titanium.
Powder drying system based on embrane method dust collecting technique the most according to claim 1, it is characterized in that comvection dryer (I) is for using thermal current directly to contact the equipment being dried with wet powder, including fluidized bed dryer, spray dryer, pneumatic conveyer dryer；The powder body being dried is inorganic salt, including Matrii Sulfas Exsiccatus, sodium carbonate, ammonium sulfate, purified salt, calcium chloride, ammonium nitrate, Diammonium phosphate (DAP), potassium carbonate, copper sulfate；Or organic compound, including adipic acid, vitamin, polystyrene, ABS plastic, crystal sugar, tetramethylolmethane, p-phthalic acid, lysine；Or biomass powder, including Semen sojae atricolor powder, starch, starch derivatives, sewage sludge, yeast, lycopene, milk powder.
Powder drying system based on embrane method dust collecting technique the most according to claim 1, it is characterised in that described heat exchanger is provided with water vapour import and steam outlet.
4. utilizing the method that the system described in claim 1 carries out 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) preheats, and uses water vapour (b) heating further to air to obtain high temperature air (f)；
B) high temperature air (f) is entered comvection dryer (I) by bottom, is dried wet powder, after dried finished product powder body is by cooling down air (m) cooling, discharges comvection dryer (I) and obtains finished product powder body (n)；
C) gas (g) after being dried powder body carries part dust under air-introduced machine (III) acts on and enters embrane method dust-precipitator (II), dust is rejected by obtaining finished product powder body (k), and natural air (a) is preheated by high temperature clean gas (j) entrance preheater (V) through film.
Powder drying method the most according to claim 4, it is characterized in that in step (C) when dusty gas enters embrane method dust-precipitator temperature 40～200 DEG C, when dusty gas is separated film (6) filtration, control single bin transmembrane pressure 100～1500Pa, total transmembrane pressure 200～2000Pa, controls gas filtration speed 0.5～2.0m/min.
Drying means the most according to claim 4, 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 the operation time reaches setting value, the lifting valve (14) of bin cuts out, make single bin off-line, the clean gas through film is used each bin to be carried out pulse jet, jetting pressure 0.2～0.5MPa, burst length 0.1～0.5s one by one.
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| CN201410756509.9A CN104501533B (en) | 2014-12-11 | 2014-12-11 | A kind of powder drying system and method based on embrane method dust collecting technique |
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| CN201410756509.9A CN104501533B (en) | 2014-12-11 | 2014-12-11 | A kind of powder drying system and method based on embrane method dust collecting technique |
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| CN104501533B true CN104501533B (en) | 2016-11-30 |
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| CN105115283B (en) * | 2015-09-15 | 2018-04-10 | 南京大学环境规划设计研究院股份公司 | A kind of airflow energy-saving drying equipment and airflow energy-saving drying means |
| CN108295636A (en) * | 2018-02-12 | 2018-07-20 | 江苏久朗高科技股份有限公司 | A kind of flue gas desulfurization denitration dust-removing integrated system and technique based on membrane material |
| CN109489345B (en) * | 2018-12-26 | 2024-01-30 | 郑州博大浓缩干燥设备有限公司 | Air flow drying system for distillers' grains protein feed production |
| 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 |
| CN110895093A (en) * | 2020-01-02 | 2020-03-20 | 天津莱沃真空干燥设备制造有限公司 | Dust-free microwave vacuum drying device for optical lens resin raw material |
| CN112716985A (en) * | 2020-11-04 | 2021-04-30 | 江苏神华药业有限公司 | Novel process for extracting paecilomyces hepiali |
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