CN101846438A - Circulating fluidized bed boiling dryer and drying method of powder material - Google Patents
Circulating fluidized bed boiling dryer and drying method of powder material Download PDFInfo
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- CN101846438A CN101846438A CN 201010162887 CN201010162887A CN101846438A CN 101846438 A CN101846438 A CN 101846438A CN 201010162887 CN201010162887 CN 201010162887 CN 201010162887 A CN201010162887 A CN 201010162887A CN 101846438 A CN101846438 A CN 101846438A
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- 238000001035 drying Methods 0.000 title claims abstract description 66
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- 239000000843 powder Substances 0.000 title claims abstract description 33
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Abstract
The invention relates to a circulating fluidized bed boiling dryer and a drying method of powder materials, belonging to the field of fluidized beds and the technical field of powder engineering. The dryer is formed by the existing boiling dryer through the following improvements that: a front main exhaust duct outside a fluidized bed is divided into a front main exhaust duct and a rear main exhaust duct, and a sieve plate net cage with a built-in screen is added between the front main exhaust duct and the rear main exhaust duct; a back-blowing device for the screen is added to prevent the screen from being clogged; a circulating device is added outside the fluidized bed to enable powder to circulate back to the main cavity of the fluidized bed; and a pneumatic delivery and unloading device is added. The drying method of the powder materials comprises the following steps: adjusting the initial state of the dryer, starting up the dryer, feeding material, drying, pneumatically delivering and unloading, cleaning the system and the like. The invention overcomes the defects that the screen area of the existing boiling dryer is small, the meshes are large, the screen is apt to be clogged when small-aperture screen is used and the existing boiling dryer can be used for millimeter-scale particle materials only, and is suitable for drying the powder materials.
Description
Technical field
The present invention relates to a kind of drying equipment and drying means thereof of fine particle shape material, be particularly related to the equipment that is used for the powder material drying and the drying means of powder material, belong to powder technology technology and fluidized bed drying technical field, strength conveying engineering technical field.
Background technology
Fine particle shape material, common drying means have solar exposure, Electric heat oven drying and light heat drying etc., are applicable to millimetre-sized material.Powder material is in light weight, easily fly upward, all have with above these methods that waste is serious when dry, the easy contaminated environment of powder of flying upward, simultaneously powder be subjected to once more environmental pollution, efficient low, be subjected to shortcomings such as environmental influence is big.Particularly Shi Yong powder material generally should not carry out drying with high temperature, in order to avoid nutritional labeling wherein is destroyed.And when baking temperature is low, exist the rate of drying of powder material slow again, defective such as easily go mouldy.For above-mentioned reasons, at present tiny granule materials is carried out drying, adopt boiling drier to carry out more, promptly come dried material with thermal current.
Boiling drier is exactly a kind of typical fluid unit that comes dried material at present with thermal current, and the structural representation of boiling drier commonly used is seen Fig. 1, generally comprises:
The air inlet system of forming by cavity 6, fluid bed air inlet 10 at the bottom of air inlet 1, total air-adjusting shutter 2, air cleaner 3, air heater 4, the fluid bed; Wherein, total air-adjusting shutter 2 is used to regulate the pressure in intake, wind speed and the fluid bed, and air cleaner 3 is used to purify the air that enters in the fluid bed, and air heater 4 is used to add hot-air; Fluid bed air inlet 10 connects fluid bed main body and air inlet system.
The fluid bed main body of forming by metal perforated plate 7, fluid bed main cavity 16, fluid bed housing 17, discharge port 80, this is the major part of drying machine, be material through place that action of high-speed airflow forms the fluidisation attitude and is dried, fluid bed housing 17 bottoms link to each other with fluid bed air inlet 10 by metal perforated plate 7, metal perforated plate 7 is also referred to as air distribution plate, the aperture that gathers on it so that air by the time form high velocity air, discharge port 80 is used for discharging.
The charging system of forming by reinforced motor 12, reductor 13, reinforced butterfly valve 14, charger 15, distributing device 8, material-feeding mechanism 9; Charging system is undertaken to the reinforced task of drying machine.Wherein, reductor 13 has two output shafts, a driving charger 15, and another root drives material-feeding mechanism 9.Reinforced butterfly valve 14 is equipped with in charger 15 hopper bottoms, both can regulate charging rate, and also air bleeds in order to prevent from not have material in the hopper.The driving shaft of material-feeding mechanism 9 passes fluid bed air inlet 10 and stretches in its cavity, drives distributing device 8 by a pair of bevel type gear, and the rotation of distributing device 8 makes material be evenly distributed on the metal perforated plate 7 and plays the effect of stirring material.
By the exhaust system that screen cloth 20, air draft are responsible for 18, main air blower 34, muffler 33 and delivery pipe 42 are formed; Exhaust system is the dynamical system of drying machine.The effect of muffler 33 is the noises that reduce blower fan, and screen cloth 20 is not taken away it in order to stop material by air-flow; Delivery pipe 42 is passing aways of air-flow.
Existing boiling drier also has instrument system: comprise thermocouple, components and parts such as wind speed, pressure measuring instruments.
The operation principle of boiling drier is: under the effect of main air blower 34, form negative pressure in the fluid bed, air heater 4 will enter and heat through air cleaner 3 cleaned air passes from air inlet 1, hot blast forms high velocity air by metal perforated plate 7 backs, make the material that adds in the fluid bed main cavity 16 from charger 15 form the fluidisation attitude, the material of fluidisation attitude fully contacts with hot blast, carry out heat and exchange of moisture fast, material is heated and is able to drying, the moisture that evaporates is drained through exhaust system with air-flow, screen cloth 20 stops material is not taken away it by air-flow, dry materials is well back by outside the discharge port 80 discharge machines.
In the existing boiling drier, stopping material makes it be not responsible for 18 interface in fluid bed housing 17 and preceding air draft by screen cloth 20 operated by rotary motion that air-flow is taken away, it is identical that 18 sections are responsible in this screen area size and preceding air draft, and to be responsible for 18 cross-sectional areas little because of preceding air draft, so screen area is also little.The aperture of screen cloth 20 is generally greater than 300 microns, so be only applicable to handle the millimeter grade particles shape material of particle diameter more than 0.3 millimeter.For particle diameter is the drying processing of material, particularly micron-sized powder materials below 300 microns, and the aperture of screen cloth 20 must be less than the minimum grain size of institute's processing materials, otherwise material can be taken away by air-flow.In the fluidisation field, gravity is compared much smaller to the influence of particle diameter material movement below 300 microns with the influence of air-flow, material mainly is to move to the screen cloth direction under the effect of air-flow, and existing boiling drier does not prevent that screen cloth from stopping up and stopping up later on its device of dredging, the aperture of screen cloth 20 too hour, material greater than mesh size can be deposited on the screen cloth 20 and stop up screen cloth under the effect of air-flow, make air draft smooth even can not air draft and make the drying machine can't normal operation.The granular material that therefore existing boiling drier is mainly used in particle diameter 0.3-6 millimeter carries out the drying processing, and can not be used for the drying processing of particle diameter less than 300 microns material, particularly micron-sized powder materials.
Summary of the invention
Purpose of the present invention, be to be used for the deficiency of particle diameter less than the dry processing of 300 microns material, particularly micron-sized powder materials at existing boiling drier, by existing boiling drier is improved, make it to become the circulating fluidized bed boiling dryer that can be used in powder material processing.Another object of the present invention is to provide the method for micron-sized powder materials fluidized drying.
For realizing that the technical measures that first purpose of the present invention is taked are such: on the basis of existing boiling drier, done following improvement: (1), outside fluid bed, set up sieve plate net cage 19, and screen cloth 20 is placed in one; (2), set up the back-blowing device of forming by back-flushing valve 26, reverse-blow pipe 27, blowback wind adjusting flashboard 29, oscillator valve 30; (3), set up the EGR of forming by circulation airduct 23, circulated air adjusting flashboard 24, circulating fan 25; (4), be responsible for 18 in the preceding air draft of former exhaust system, set up discharging airduct 35, discharging butterfly valve 36, discharge arm 39, discharge butterfly valve 40, material collector 41, discharging butterfly valve 43 on the basis of main air blower 34, muffler 33 and delivery pipe 42, the common strength of forming is carried device for discharging, and the discharge port 80 of the existing fluid bed dryer of cancellation; (5), the preceding air draft person in charge 18 that will have now in the drying machine is divided into the preceding air draft person in charge 18 and the back air draft person in charge 31.
The structure of the device of being set up and and existing boiling drier each several part between annexation as follows:
Described sieve plate net cage 19 is hexahedral casings, see Fig. 3, the air draft person in charge 18 was responsible for 31 centre with the back air draft before this sieve plate net cage 19 was provided with and is fixed on, the casing upper surface is airtight, casing left plate top has a fresh air inlet 62 and the preceding air draft person in charge's 18 the port of export to link to each other, the top of right plate has an anti-blowhole 63 to link to each other with the port of export of reverse-blow pipe 27, the bottom of right plate has an exhaust vent 64 and the back air draft person in charge's 31 entrance point to link to each other, and the middle part in casing lower end board left side has a circulated air hole 65 to link to each other with circulation airduct 23; But be tightly connected and demolition between front and back biside plate 46 and other four blocks of plates of casing; The described screen cloth 20 that places in the sieve plate net cage 19,18 lopsidedness are responsible in its upper end air draft forward, and its lower end is positioned at 65 the right, circulated air hole, and screen cloth 20 is divided into left and right sides two parts with sieve plate net cage 19, become both fixing seals with sieve plate net cage 19 box houses, dismountable again connected mode around it.
The air inlet of the reverse-blow pipe 27 of described back-blowing device is located at after the interior air cleaner 3 of air inlet system, the anti-blowhole 63 of air outlet and sieve plate net cage 19 is joined, back-flushing valve 26, blowback wind are regulated 63 of flashboard 29 reflexive blowhole, are installed in the centre of reverse-blow pipe 27 successively; Described oscillator valve 30 is installed on the end that close sieve plate net cage 19 on 31 is responsible in the back air draft, and the exhaust vent 64 of its entrance point and sieve plate net cage 19 joins;
The air inlet of the circulation airduct 23 of described EGR is connected with the circulated air hole 65 of sieve plate net cage 19, and its air outlet passes fluid bed lower house 11, extend in the fluid bed main cavity 16; Circulated air is regulated 65 in flashboard 24 and circulating fan 25 self-loopa wind holes, is installed in the middle part of circulation airduct 23 successively;
Described strength carries the entrance point of the discharging airduct 35 of device for discharging to be connected on the circulation airduct 23, regulates between flashboard 24 and the circulated air hole 65 at circulated air, and its port of export is connected the back air draft and is responsible on 31, is positioned at the centre of oscillator valve 30 and main air blower 34; Described discharging butterfly valve 36 is installed in the middle part of discharging airduct 35; Described discharge arm 39 is told by delivery pipe 42 by threeway, and discharge butterfly valve 40 is housed on it, and material collector 41 is installed in the end of discharge arm 39, and detachable, and discharging butterfly valve 43 is installed on the end of delivery pipe 42.
After the boiling drier to prior art had carried out above-mentioned improvement, boiling drier had become circulating fluidized bed boiling dryer of the present invention.
For realizing first purpose of the present invention, the further preferred pair sieve plate net cage systems that adopt of this equipment.Described pair of sieve plate screen box system is such: the sieve plate net cage is composed in parallel by two identical and symmetrical branch roads of structure, a branch road comprises sieve plate net cage 19, back-flushing valve 26, oscillator valve 30, screen cloth 20 in the sieve plate net cage 19, another branch road comprise another sieve plate net cage 56, another back-flushing valve 57, another oscillator valve 55, another screen cloth 70 in another sieve plate net cage 56.Its annexation (seeing Fig. 4-6) is: the preceding air draft person in charge's 18 the port of export links to each other with the fresh air inlet of sieve plate net cage 19 with another sieve plate net cage 56 by air intake threeway 58 simultaneously; The back air draft person in charge's 31 entrance point is connected with the outlet of oscillator valve 30 with another oscillator valve 55 by air draft threeway 60 simultaneously; The port of export of reverse-blow pipe 27 is connected with the entrance point of back-flushing valve 26 with another back-flushing valve 57 by blowback wind threeway 59 simultaneously; The entrance point of circulation airduct 23 is connected with the circulated air hole of sieve plate net cage 19, another sieve plate net cage 56 by circulated air threeway 61 simultaneously; The import of oscillator valve 30 links to each other with the exhaust vent 64 of sieve plate net cage 19; The import of another oscillator valve 55 links to each other with the exhaust vent of another sieve plate net cage 56; The outlet of back-flushing valve 26 links to each other with the anti-blowhole 63 of sieve plate net cage 19; The outlet of another back-flushing valve 57 links to each other with the anti-blowhole of another sieve plate net cage 56.The port of export of discharging airduct is connected the centre that oscillator valve 30 and main air blower 34 on 31 are responsible in the back air draft, after the air draft threeway 60.
In order to guarantee the blowback effect, can on reverse-blow pipe 27, install back blowing machine additional.For strengthening the impact strength of screen cloth, screen cloth is made with folder aperture screen cloth or filter cloth in the screen cloth of two-layer macropore, the screen cloth of macropore is used to strengthen the ability of aperture screen cloth or filter cloth resistance to deformation, and aperture screen cloth or filter cloth are to stop material is not taken away it by air-flow screen cloth.
The operation principle that this circulation boiling drier can be used in the device that purpose increased of powder material drying is:
The sieve plate net cage that is increased, because of being arranged on outside the fluid bed, can increase its space geometry size and increase the area of screen cloth, thereby increased the screen cloth effective drift diameter, the sieve plate net cage cooperates back-blowing device, EGR to solve the blockage problem of screen cloth completely, therefore can adopt fine pore size is that the screen cloth of high order number does not make it overflow with air-flow to stop material, make this circulation boiling drier can be used in the drying processing of powder material, this device will have the scope that material that boiling drier can process has expanded to powder material now.
The effect of back-blowing device is to remove to be deposited in the material that stops up screen cloth on the screen cloth.During normal operation, most air enter in the fluid bed main cavity 16, make material form the fluidisation attitude; The small part air enters the blowback effect of the paired screen cloth of screen deck net box-shaped through reverse-blow pipe 27 when back-flushing valve is opened, this blowback effect can be removed and is deposited in the material that stops up screen cloth on the screen cloth, thereby back-blowing device is actually the dredger of screen cloth, back-blowing device has reduced the obstruction of screen cloth greatly, the normal operation when having guaranteed the fluidized bed processing powder material.
The effect of EGR is that the material that material that air-flow is entrained and blowback wind blow off from screen cloth is sent back in the fluid bed main cavity again, and EGR is actually the device that prevents that screen cloth from stopping up.EGR has further guaranteed the unobstructed of screen cloth.EGR also brings two usefulness, the one, the sieve plate net cage volume space before the preceding air draft person in charge 18, circulation airduct 23 and the screen cloth, in fact become the part of fluid bed main cavity, equaled to enlarge the cavity of fluid bed, improved the working ability of circulation boiling drier; The 2nd, circulating fan has improved the wind speed in the fluid bed main cavity, has strengthened the heat and the moisture transmission of air-flow and storeroom, has improved the efficient of boiling drier.
The air-flow branch that enters the sieve plate net cage is done two bursts of discharges, one passes screen cloth, after the back air draft is responsible for 31, main air blower 34, muffler 33, delivery pipe 42 are discharged, this is to make material form the air-flow of fluidisation attitude by oscillator valve, and screen cloth stops material it is not taken away by air-flow; Another strand air-flow is in the material that carries the fluidisation attitude under the effect of circulating fan 25 repetitive cycling drying in circulation airduct 23 enters the fluid bed main cavity.
The principle of device for discharging is that strength is carried.During discharging, open discharge butterfly valve 40, close discharging butterfly valve 43, open discharging butterfly valve 36, close oscillator valve, extract fluidised material by main air blower 34 through discharging airduct 35, material is collected by material collector 41.
Realize another object of the present invention, promptly adopt this equipment that micron-sized powder material is carried out the fluidized drying method for processing and may further comprise the steps successively:
The adjustment of A, drying machine original state and startup:, install its aperture and can stop the screen cloth 20 that material can not be taken away it by air-flow according to the size of powder material particle diameter; Close discharging butterfly valve 36, reinforced butterfly valve 14, discharge butterfly valve 40; The total air-adjusting shutter 2 of standard-sized sheet, discharging butterfly valve 43, blowback wind are regulated flashboard 29, circulated air is regulated flashboard 24; Install material collector 41; Start main air blower 34, circulating fan 25, start oscillator valve 30, back-flushing valve 26, and adjust opposite all the time with the open and-shut mode of back-flushing valve 26 with control oscillator valve 30; Start air heater 4, form negative pressure this moment in the fluid bed main cavity 16 under the effect of main air blower 34, and air is heated.
B, reinforced and dry: start charger 15 and material-feeding mechanism 9, open reinforced butterfly valve 14, material to be processed is added in the fluid bed main cavity 16 through charger 15, adjust the aperture of reinforced butterfly valve 14, the input speed of control material makes the ulking thickness of material on metal perforated plate 7 be no more than the height of distributing device 8; Close reinforced butterfly valve 14 after adding material, in case air bleeds; Regulate the aperture of total air-adjusting shutter 2, blowback wind adjusting flashboard 29 and circulated air adjusting flashboard 24, with pressure, wind speed, the air quantity in the control drying machine, wind speed, the air quantity of control blowback wind and circulated air, control material be heap and obstruction sieve aperture on screen cloth 20 not; Material forms the fluidisation attitude under the effect of the stirring of the distributing device 8 that rotates and high velocity air, the material of fluidisation attitude fully contacts with hot blast, carry out heat and exchange of moisture fast, material is heated and is able to drying, cross screen cloth with air communication after the water evaporates and by behind the oscillator valve 30, successively through the back air draft be responsible for 31, main air blower 34, muffler 33, delivery pipe 42 and discharge butterfly valve 43 and enter in the atmosphere; Screen cloth 20 stops material, and it is not overflowed with air-flow, and the material that material that circulating fan 25 is entrained with air-flow and blowback wind blow off from screen cloth is sent cyclic dryings in the drying machine main cavity 16 again back to, finishes up to dry materials;
C, strength are carried discharging: open discharge butterfly valve 40, close discharging butterfly valve 43, open discharging butterfly valve 36, close oscillator valve, the material of fluidisation attitude under the effect of main air blower 34 through discharging airduct 35, after air draft be responsible for 31, main air blower 34, muffler 33, delivery pipe 42 and discharge arm 39 enter material collector 41 and are collected;
D, system's cleaning: after material racks up, close discharge butterfly valve (40), standard-sized sheet other all flashboards and butterfly valve, cleaning equipment under the purging effect of high velocity air.After system has cleaned, close all valves and blower fan and shut down.
The invention has the beneficial effects as follows:
1, because the sieve plate net cage that increases, because of being arranged on outside the fluid bed main cavity 16, can increase its space geometry size and increase the area of screen cloth, when particularly adopting two screen deck net box structure, the area of two screen clothes 20 and screen cloth 70, thereby increased the screen cloth effective drift diameter, the sieve plate net cage system cooperates back-blowing device, EGR has solved the blockage problem of screen cloth effectively, therefore can adopt fine pore size is the screen cloth of high order number, make this circulating fluidized bed boiling dryer that is transformed into by existing boiling drier can be used for the drying processing of micron-sized powder materials, the material that boiling drier can be processed expands to the scope of micron-sized powder.
2, before EGR makes air draft be responsible for 18, the sieve plate net cage volume space before circulation airduct 23 and the screen cloth 20, become the part of drying machine main cavity, equal to have enlarged dryer cavity, improved the working ability of drying machine; The periodic duty of part hot blast has prolonged the time of contact with material, has improved efficiency; Circulating fan has improved the wind speed in the fluid bed main cavity, has strengthened the heat and the moisture transmission of air-flow and storeroom, will send cyclic drying in the fluid bed main cavity fast back to from the material that screen cloth falls, and has improved the efficient of boiling drier.
3, the strength waste of carrying discharging to avoid material to fly upward to cause and to the pollution of production environment and institute's converted products has also reduced labour intensity; Simultaneously, material is handled in the drying machine of sealing, also can be not contaminated.
Certainly, this circulation boiling drier can not only be used for the drying processing of particle diameter less than 300 microns material, as long as select the suitable screen cloth of pore size, this machine also can be used for the drying processing of millimeter grade particles material.
Description of drawings
Fig. 1 is the basic structure schematic diagram of existing boiling drier;
Fig. 2 is the structural representation of circulating fluidized bed boiling dryer of the present invention, the mark mark of the identical parts of another branch road when the Reference numeral in its bracket represents to adopt two sieve plate net cage;
Fig. 3 is the structural representation of single sieve plate net cage;
Fig. 4-Fig. 6 is two sieve plate net cage system architecture schematic diagrames.
Each Reference numeral is among the figure: 1, air inlet; 2, total air-adjusting shutter; 3, air cleaner; 4, air heater; 6, cavity at the bottom of the fluid bed; 7, metal perforated plate; 8, distributing device; 9, material-feeding mechanism; 10, fluid bed air inlet; 12, reinforced motor; 13, reductor; 14, reinforced butterfly valve; 15, charger; 16, fluid bed main cavity; 17, fluid bed housing; 18, preceding air draft is responsible for; 19, sieve plate net cage; 20, screen cloth; 23, circulation airduct; 24, circulated air is regulated flashboard; 25, circulating fan; 26, back-flushing valve; 27, reverse-blow pipe; 29, blowback wind is regulated flashboard; 30, oscillator valve; 31, the back air draft is responsible for; 33, muffler; 34, main air blower; 35, discharging airduct; 36, discharging butterfly valve; 39, discharge arm; 40, discharge butterfly valve; 41, material collector; 42, delivery pipe; 43, discharging butterfly valve; 46, sieve plate net cage side plate; 47, the observation window on the side plate; 55, another oscillator valve; 56, another sieve plate net cage; 57, another back-flushing valve; 58, air intake threeway; 59, blowback wind threeway; 60, air draft threeway; 61, circulated air threeway; 62, the fresh air inlet of sieve plate net cage; 63, the anti-blowhole of sieve plate net cage; 64, the exhaust vent of sieve plate net cage; 65, the circulated air hole of sieve plate net cage; 70, another screen cloth; 80, discharge port.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples, but embodiment is not construed as limiting the invention.
The structure of embodiment 1, circulation boiling drier is seen Fig. 2, and wherein the sieve plate net cage adopts two screen deck net box structures, sees Fig. 4-6, and the circulation boiling drier is made of following several parts:
1), air inlet system: the function of air inlet system is to provide satisfactory hot blast for boiling drier, air inlet system by air inlet 1, total air-adjusting shutter 2, air cleaner 3, air heater 4, fluid bed at the bottom of cavity 6, fluid bed air inlet 10 forms, total air-adjusting shutter 2 is used to regulate the interior pressure of intake, wind speed and drying machine; Air cleaner 3 is used to purify the air that enters in the drying machine; Air heater 4 is used to add hot-air, and fluid bed air inlet 10 connects fluid bed and air inlet system.
2), fluid bed main body: comprise fluid bed main cavity 16, fluid bed housing 17, metal perforated plate 7.Fluid bed main cavity 16 is places that material forms the fluidisation attitude and is dried; Fluid bed housing 17 bottoms link to each other with fluid bed air inlet 10 by metal perforated plate 7; Circulation airduct 23 passes fluid bed housing 17 and stretches in the fluid bed main cavity 16, and charger 15 also passes this housing and feeds in raw material; Metal perforated plate 7 is also referred to as air distribution plate, is a metallic plate, the aperture that gathers on it so that air by the time form high velocity air.
3), charging system: charging system is undertaken to the reinforced task of drying machine, is made up of reinforced motor 12, reductor 13, charger 15, material-feeding mechanism 9, and reductor 7 has two output shafts, a driving charger 15, another root driving material-feeding mechanism 9.Reinforced butterfly valve 14 is equipped with in charger 15 hopper bottoms, both can regulate charging rate, and also air bleeds in order to prevent from not have material in the hopper.Material-feeding mechanism 9 driving shafts pass fluid bed air inlet 10 and stretch in its cavity, drive distributing device 8 by a pair of bevel type gear, distributing device 8 is welded on the axle sleeve by bonding jumper and forms, distributing device 8 is by the bearings that is contained on the metal perforated plate 7, and the rotation of distributing device 8 makes material be evenly distributed on the metal perforated plate 7 and plays the effect of stirring material.
4), exhaust system: exhaust system is made up of the preceding air draft person in charge 18, the back air draft person in charge 31, main air blower 34, muffler 33, delivery pipe 42 and discharging butterfly valve 43, is the dynamical system of drying machine.The top that 18 entrance points are connected on fluid bed housing 17 is responsible in preceding air draft, and the port of export links to each other with the air intake threeway 58 of two sieve plate net cage systems; Back air draft is responsible for 31 entrance points and is linked to each other with the air draft threeway 60 of two sieve plate net cage systems, and the port of export is connected on the air inlet of main air blower 34, and delivery pipe 42 is connected on the end of exhaust system, and discharging butterfly valve 43 is housed on it.
5), sieve plate net cage: the sieve plate net cage is for realizing that the circulation boiling drier can be used in the improvement that the processing of powder material is done the screen cloth 20 of boiling drier, purpose is the area that increases screen cloth, and is the space for the creativity condition that is provided with of EGR and back-blowing device.The structure of single sieve plate net cage is seen accompanying drawing 3, it is a hexahedral casing, the air draft person in charge 18 was responsible for 31 centre with the back air draft before this sieve plate net cage 19 was provided with and is fixed on, its upper surface is airtight, casing left plate top has a fresh air inlet 62 and the preceding air draft person in charge's 18 the port of export to link to each other, the top of right plate has an anti-blowhole 63 to link to each other with the port of export of reverse-blow pipe 27, the bottom of right plate has an exhaust vent 64 and the back air draft person in charge's 31 entrance point to link to each other, and the middle part in lower end board left side has a circulated air hole 65 to link to each other with circulation airduct 23; But be tightly connected and demolition between front and back biside plate 46 and other four blocks of plates of casing; Screen cloth 20 is installed in sieve plate net cage 19 inside, 18 lopsidedness are responsible in its upper end air draft forward, and its lower end is positioned at 65 the right, circulated air hole, and screen cloth 20 is divided into left and right sides two parts with sieve plate net cage 19, become both fixing seals with sieve plate net cage 19 box houses, dismountable again connected mode around it.The screen cloth that multiple mesh size arranged is used to process the material of different-grain diameter for you to choose.
Two sieve plate net cage systems that present embodiment adopts identical but symmetrical simple sieve plate net cage parallel connection by two said structures, and connect to form with air intake threeway 58, blowback wind threeway 59, air draft threeway 60, circulated air threeway 61 and other parts: a branch road comprises sieve plate net cage 19, back-flushing valve 26, oscillator valve 30, screen cloth 20 in the sieve plate net cage 19, another branch road comprises another sieve plate net cage 56, another back-flushing valve 57, another oscillator valve 55, another screen cloth 70 in another sieve plate net cage 56.Its annexation is: the preceding air draft person in charge's 18 the port of export links to each other with the fresh air inlet of sieve plate net cage 19 with another sieve plate net cage 56 by air intake threeway 58 simultaneously; The back air draft person in charge's 31 entrance point is connected with the outlet of oscillator valve 30 with another oscillator valve 55 by air draft threeway 60 simultaneously; The port of export of reverse-blow pipe 27 is connected with the entrance point of back-flushing valve 26 with another back-flushing valve 57 by blowback wind threeway 59 simultaneously; The entrance point of circulation airduct 23 is connected with the circulated air hole of sieve plate net cage 19, another sieve plate net cage 56 by circulated air threeway 61 simultaneously; The import of oscillator valve 30 links to each other with the exhaust vent 64 of sieve plate net cage 19; The import of another oscillator valve 55 links to each other with the exhaust vent of another sieve plate net cage 56; The outlet of back-flushing valve 26 links to each other with the anti-blowhole 63 of sieve plate net cage 19; The outlet of another back-flushing valve 57 links to each other with the anti-blowhole of another sieve plate net cage 56.Discharging wind tube outlet end is connected the centre that oscillator valve 30 and main air blower 34 on 31 are responsible in the back air draft, after the air draft threeway 60.
Screen cloth is made with folder aperture screen cloth or filter cloth in the screen cloth of two-layer macropore, the screen cloth of macropore is used to strengthen the ability of aperture screen cloth or filter cloth resistance to deformation, aperture screen cloth or filter cloth are to stop material to make its screen cloth of not taken away by air-flow, and the size of its mesh size is determined according to the particle diameter of institute's processing materials.Screen cloth is installed in sieve plate net cage inside, and the sieve plate net cage is divided into left and right sides two parts, and 18 lopsidedness are responsible for, screen cloth being installed as in the sieve plate net cage in screen cloth upper end air draft forward: around it both with screen deck net chamber interior wall fixing seal, can change easily it again.
6), EGR: be made up of circulation airduct 23, circulation airduct regulator plate 24, circulating fan 25, its function is to improve the obstruction of screen cloth.23 imports of circulation airduct are joined with the circulated air threeway 61 of two sieve plate net cages, and fluid bed housing 17 bottoms are passed in outlet, stretch in the fluid bed main cavity 16, and circulation airduct regulator plate 24 can be regulated air circulation.
7), back-blowing device: back-blowing device is the dredger of screen cloth, and by two back-flushing valves, 26,57, two oscillator valves 30,55, reverse-blow pipe 27, blowback wind are regulated flashboard 29 and formed.Reverse-blow pipe outlet is joined with the blowback wind threeway 59 of two sieve plate net cage systems, and import is located in the air inlet system after the air heat 4.
Vibrating valve and back-flushing valve are controlled by electric device, and its switching cycle is adjustable.Its open and-shut mode is followed following rule: the vibrating valve in the same branch road is opposite with the back-flushing valve open and-shut mode, and the back-flushing valve in two branch roads can be in the state of pass simultaneously, but the state that can not be in out simultaneously.
8), strength carries device for discharging: what this process adopted is that strength is carried discharge way, device for discharging by discharging airduct 35, discharging butterfly valve 36, discharge arm 39, discharge butterfly valve 40, material collector 41, and the preceding air draft of exhaust system is responsible for 18, the back air draft is responsible for 31, main air blower 34, muffler 33, delivery pipe 42 and discharging butterfly valve 43 are formed.Discharging airduct 35 entrance points are connected before the circulation airduct 23 circulation airduct regulator plates 24, and outlet is responsible for 31 with the back air draft and is linked to each other, and discharging butterfly valve 36 is equipped with in the centre; Discharge arm 39 is told by delivery pipe 42 by threeway, and discharge butterfly valve 40 is housed on it.Material collector 41 is contained in the terminal and detachable of discharge arm 39, and material collector 41 is selected modular system according to the character and the particle diameter of institute's processing materials, can be deduster or filter bag.
9), instrument system: in the circulation boiling drier thermocouple is installed, components and parts such as wind speed, pressure measxurement control instrument are realized the automatic control of circulation boiling drier technological parameter.
Pollen pini is the pollen of the flower opened of pine tree, is a kind of precious raw material resources of medicine-food two-purpose.The preserved egg powder flies upward easily, and good fluidity does not lump under the normality, exists with the form of individual cells.Examine under a microscope, the pollen pini cell surface is smooth, total length 60-120 micron, and the wide 50-60 micron of body, height 30-50 micron is flat ellipse, belongs to micron-sized powder materials.Contain moisture in the bright pollen pini of plucking, be difficult for preserving, need it is carried out drying.In the prior art pollen pini raw material dry main adopt air dry, also have drying means such as the Electric heat oven drying of employing and light heat drying, these drying means all exist waste serious, easily pollute, efficient is low, labour intensity is big, be subjected to shortcomings such as environmental influence is big.The baking temperature of pollen pini should not surpass 50 ℃, otherwise can cause the part loss of nutritive components;
Present embodiment adopts embodiment 1 described circulation boiling drier, and the pollen pini raw material is carried out drying, carries out as follows:
A, just cheat the adjustment of state and the startup of drying machine: according to the size of pollen pini particle diameter, select intransitable 350 eye mesh screens of its particle diameter for use, install 350 purpose sieve plates, guarantee that discharging butterfly valve 36, reinforced butterfly valve 14, discharge butterfly valve 40 close; The total air-adjusting shutter 2 of standard-sized sheet, blowback wind are regulated flashboard 29, circulated air is regulated flashboard 24, discharging butterfly valve 43; Install material collector 41; Start main air blower 34, circulating fan 25; Start oscillator valve 30, oscillator valve 55, back-flushing valve 26, back-flushing valve 57, and it is opposite all the time with the open and-shut mode of back-flushing valve to adjust and control in the same branch road oscillator valve, the adjusting air heater makes hot blast temperature remain on 45-50 ℃.Form negative pressure this moment in the drying machine under the effect of main air blower.
B, reinforced and dry; Start charger 15 and material-feeding mechanism 9, open reinforced butterfly valve 14, pollen pini to be processed is added in the fluid bed main cavity 16 through charger 15, adjust the aperture of reinforced butterfly valve 14, the input speed of control material makes the ulking thickness of material on metal perforated plate 7 be no more than the height of distributing device 8.Close reinforced butterfly valve 14 after adding material, in case air bleeds; Regulate the aperture that total air-adjusting shutter 2, blowback wind adjusting flashboard 29 and circulated air are regulated flashboard 24, with pressure, wind speed, air quantity in the control drying machine, wind speed, the air quantity of control blowback wind and circulated air make the heap and the obstruction that do not occur material on the screen cloth 20.The situation that whether the material heap is arranged on the screen cloth 20 and stop up can be observed from observation window.
Material forms the fluidisation attitude under the effect of the stirring of the distributing device 8 that rotates and high velocity air, the material of fluidisation attitude fully contacts with hot blast, carry out heat and exchange of moisture fast, material is heated and is able to drying, cross behind screen cloth 20, the screen cloth 70 successively by oscillator valve 30, oscillator valve 55 with air communication after the water evaporates, back air draft is responsible for 31, main air blower 34, and muffler 33 and delivery pipe 42, discharging butterfly valve 43 enter in the atmosphere.Screen cloth 20, screen cloth 70 stop material, it is not overflowed with air-flow, the material that material that circulating fan 25 is entrained with air-flow and blowback wind blow off from screen cloth is sent back to again and is continued drying in the drying machine main cavity 16, drop to below 8% of national Specification up to dry materials to moisture, drying is finished.
C, strength are carried discharging: open discharge butterfly valve 40, close discharging butterfly valve 43, open discharging butterfly valve 36, close oscillator valve 30, oscillator valve 55, material in the fluid bed under the effect of main air blower 34 through discharging airduct 35, the back air draft person in charge 31, main air blower 34, muffler 33, delivery pipe 42 and discharge arm 39 enter screenings gatherer 41 and are collected.
D, system's cleaning and shutdown: after material racks up, close discharge butterfly valve 40, standard-sized sheet other all flashboards and butterfly valve, cleaning equipment under the purging effect of high velocity air.After system has cleaned, close all valves and blower fan and shut down.
Pollen pini is pressed after above-mentioned steps in the present embodiment handles through the inventive method and equipment, and moisture is easy to drop to below 8% of national Specification.
Claims (6)
1. circulating fluidized bed boiling dryer, form by existing boiling drier transformation, comprise the air inlet system of forming by cavity (6), fluid bed air inlet (10) at the bottom of air inlet (1), total air-adjusting shutter (2), air cleaner (3), air heater (4), the fluid bed in the existing boiling drier; The fluid bed main body of forming by metal perforated plate (7), fluid bed main cavity (16), fluid bed housing (17); The charging system of forming by reinforced motor (12), reductor (13), reinforced butterfly valve (14), charger (15), distributing device (8), material-feeding mechanism (9); Be responsible for the exhaust system that (18), main air blower (34), muffler (33) and delivery pipe (42) are formed by air draft; By thermocouple, the instrument system that wind speed, pressure measuring instruments are formed; It is characterized in that: this circulating fluidized bed boiling dryer has been done following improvement on the basis of existing boiling drier: set up sieve plate net cage (19) and screen cloth (20) is placed in one outside fluid bed; Set up the back-blowing device of forming by back-flushing valve (26), reverse-blow pipe (27), blowback wind adjusting flashboard (29), oscillator valve (30); Set up the EGR of forming by circulation airduct (23), circulated air adjusting flashboard (24), circulating fan (25); Be responsible on the basis of (18), main air blower (34), muffler (33) and delivery pipe (42) in the preceding air draft of former exhaust system, set up discharging airduct (35), discharging butterfly valve (36), discharge arm (39), discharge butterfly valve (40), material collector (41), discharging butterfly valve (43), formed strength jointly and carry device for discharging; Cancel the discharge port (80) of existing fluid bed dryer, (31) were responsible in the air draft person in charge (18) and back air draft before the preceding air draft person in charge (18) in the existing drying machine was divided into;
The structure of the device of being set up and and existing boiling drier each several part between annexation as follows:
Described sieve plate net cage (19) is a hexahedral casing, (18) and the back air draft person in charge's (31) centre was responsible in air draft before this sieve plate net cage (19) was provided with and is fixed on, the casing upper surface is airtight, the port of export that casing left plate top has a fresh air inlet (62) and preceding air draft to be responsible for (18) links to each other, the top of right plate has an anti-blowhole (63) to link to each other with the port of export of reverse-blow pipe (27), the entrance point that the bottom of right plate has an exhaust vent (64) and back air draft to be responsible for (31) links to each other, and the middle part in casing lower end board left side has a circulated air hole (65) to link to each other with circulation airduct (23); Before and after biside plate (46) but with the also demolition that is tightly connected between other four blocks of plates of casing; The described screen cloth (20) that places in the sieve plate net cage (19), (18) lopsidedness is responsible in its upper end air draft forward, its lower end is positioned at the right, circulated air hole (65), screen cloth (20) is divided into left and right sides two parts with sieve plate net cage (19), become both fixing seals, dismountable again connected mode with sieve plate net cage (19) box house around it;
The air inlet of the reverse-blow pipe of described back-blowing device (27) is located at the interior air cleaner (3) of air inlet system afterwards, the anti-blowhole (63) of air outlet and sieve plate net cage (19) is joined, back-flushing valve (26), blowback wind are regulated the reflexive blowhole of flashboard (29) (63) and are risen, and are installed in the centre of reverse-blow pipe (27) successively; Described oscillator valve (30) is installed on the back air draft and is responsible for the end that (31) go up close sieve plate net cage (19), and the exhaust vent (64) of its entrance point and sieve plate net cage (19) joins;
The air inlet of the circulation airduct (23) of described EGR is connected with the circulated air hole (65) of sieve plate net cage (19), and its air outlet passes fluid bed lower house (11), extend in the fluid bed main cavity (16); Circulated air regulates flashboard (24) and rise in circulating fan (25) self-loopa wind hole (65), is installed in the middle part of circulation airduct (23) successively;
Described strength is carried device for discharging except that comprising the former exhaust system of being made up of the preceding air draft person in charge (18), the back air draft person in charge (31) main air blower (34), muffler (33) and delivery pipe (42), also comprises discharging airduct (35), discharging butterfly valve (36), discharge arm (39), discharge butterfly valve (40), material collector (41), discharging butterfly valve (43); The entrance point of described discharging airduct (35) is connected circulation airduct (23) cocycle wind and regulates between flashboard (24) and circulated air hole (65), and the port of export is connected the back air draft and is responsible for the centre that (31) go up oscillator valve (30) and main air blower (34); Described discharging butterfly valve (36) is installed in the middle part of discharging airduct (35); Described discharge arm (39) is told by delivery pipe (42) by threeway, and discharge butterfly valve (40) is housed on it, and material collector (41) is installed in the end of discharge arm (39), and detachable, and discharging butterfly valve (43) is installed in delivery pipe (42) end.
2. circulating fluidized bed boiling dryer according to claim 1, it is characterized in that: described sieve plate net cage composes in parallel two sieve plate net cage systems by two identical and symmetrical branch roads of structure: branch road comprises the screen cloth (20) in sieve plate net cage (19), back-flushing valve (26), oscillator valve (30), the sieve plate net cage (19), and another branch road comprises another screen deck net (70) in another sieve plate net cage (56), another back-flushing valve (57), another oscillator valve (55), another sieve plate net cage (56); Its annexation is: the port of export that (18) are responsible in preceding air draft links to each other with the fresh air inlet of sieve plate net cage (19) with another sieve plate net cage (56) by air intake threeway (58) simultaneously; The entrance point that (31) are responsible in back air draft is connected with the outlet of oscillator valve (30) with another oscillator valve (55) by air draft threeway (60) simultaneously; The port of export of reverse-blow pipe (27) is connected with the entrance point of back-flushing valve (26) with another back-flushing valve (57) by blowback wind threeway (59) simultaneously; The entrance point of circulation airduct (23) is connected with the circulated air hole of sieve plate net cage (19), another sieve plate net cage (56) by circulated air threeway (61) simultaneously; The import of oscillator valve (30) is connected with the exhaust vent (64) of sieve plate net cage (19); The import of another oscillator valve (55) links to each other with the exhaust vent of another sieve plate net cage (56); The outlet of back-flushing valve (26) links to each other with the anti-blowhole (63) of sieve plate net cage (19);
The outlet of another back-flushing valve (57) links to each other with the anti-blowhole of another sieve plate net cage (56); The port of export of discharging airduct is connected the centre that oscillator valve (30) and main air blower (34) on 31 are responsible in the back air draft, and air draft threeway (60) afterwards.
3. circulating fluidized bed boiling dryer according to claim 1 and 2 is characterized in that: install back blowing machine additional on reverse-blow pipe (27).
4. circulating fluidized bed boiling dryer according to claim 1 is characterized in that: screen cloth (20) is formed with folder aperture screen cloth in the screen cloth of two-layer macropore.
5. circulating fluidized bed boiling dryer according to claim 2 is characterized in that: screen cloth (20) is formed with folder aperture screen cloth in the screen cloth of two-layer macropore.
6. the described equipment of claim 1 is used for the method for micron-sized powder materials drying, and it is characterized in that: this method may further comprise the steps successively:
The adjustment of A, drying machine original state and startup:, install its aperture and can stop the screen cloth (20) that material can not be taken away it by air-flow according to the size of powder material particle diameter; Close discharging butterfly valve (36), reinforced butterfly valve (14), discharge butterfly valve (40);
The total air-adjusting shutter of standard-sized sheet (2), discharging butterfly valve (43), blowback wind are regulated flashboard (29), circulated air is regulated flashboard (24); Install material collector (41); Start main air blower (34), circulating fan (25), start oscillator valve (30), back-flushing valve (26), and adjust opposite all the time with the open and-shut mode of back-flushing valve (26) with control oscillator valve (30); Start air heater (4); Form negative pressure this moment in the fluid bed main cavity (16) under the effect of main air blower (34), air is heated;
B, reinforced and dry: start charger (15) and material-feeding mechanism (9), open reinforced butterfly valve (14), material to be processed is added in the fluid bed main cavity (16) through charger (15), adjust the aperture of reinforced butterfly valve (14), the input speed of control material makes the ulking thickness of material on metal perforated plate (7) be no more than the height of distributing device (8); Close reinforced butterfly valve (14) after adding material, in case air bleeds; Regulate the aperture that total air-adjusting shutter (2), blowback wind adjusting flashboard (29) and circulated air are regulated flashboard (24), with pressure, wind speed, the air quantity in the control drying machine, wind speed, the air quantity of control blowback wind and circulated air make the heap that does not occur material on the screen cloth (20) and stop up sieve aperture; Material is in the effect of the stirring of the distributing device (8) that rotates and high velocity air formation fluidisation attitude down, the material of fluidisation attitude fully contacts with hot blast, carry out heat and exchange of moisture fast, material is heated and is able to drying, cross screen deck net with air communication after the water evaporates and, be responsible for (31), main air blower (34), muffler (33), delivery pipe (42) and discharge butterfly valve (43) entering in the atmosphere successively through the back air draft by behind the oscillator valve (30); Screen cloth (20) stops material, and it is not overflowed with air-flow, and the material that material that circulating fan (25) is entrained with air-flow and blowback wind blow off from screen deck net is sent the interior cyclic drying of drying machine main cavity (16) again back to, finishes up to dry materials;
C, strength are carried discharging: open discharge butterfly valve (40), close discharging butterfly valve (43), open discharging butterfly valve (36), close oscillator valve (30), the material of fluidisation attitude under the effect of main air blower (34) through discharging airduct (35), after air draft be responsible for (31), main air blower (34), muffler (33), delivery pipe (42) and discharge arm (39) enter material collector (41) and are collected;
D, system's cleaning: after material racks up, close discharge butterfly valve (40), standard-sized sheet other all flashboards and butterfly valve, cleaning equipment under the purging effect of high velocity air; After system has cleaned, close all valves and blower fan and shut down.
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| CN2010101628876A CN101846438B (en) | 2010-05-05 | 2010-05-05 | Circulating fluidized bed boiling dryer and drying method of powder material |
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| CN2010101628876A CN101846438B (en) | 2010-05-05 | 2010-05-05 | Circulating fluidized bed boiling dryer and drying method of powder material |
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| CN103719656A (en) * | 2013-12-31 | 2014-04-16 | 楚雄长青科技有限公司 | Drying, sterilizing, impurity removal and screening device implemented by using circulating airflow and processing method of pollen pini |
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