The continous vacuum microwave drier reaches by the drying means of this device to alkaline earth metal chloride
Technical field
The invention belongs to the drying device technical field, be specifically related to a kind of continous vacuum microwave drier, and relate to by the drying means of this device to alkaline earth metal chloride
Background technology
above mentioned alkaline earth metal chloride mainly but definitely be not limited to the polymerization that is used for PPTA and copolymer thereof; Because such as industry knowledge; In the polymerization process of PPTA and copolymer thereof, need to add alkaline earth metal chloride as cosolvent; And requirement moisture in the system in the PPTA polymerization process is lower than 100ppm; Therefore, need to be dried to over dry (adiabatic drying) as the alkaline earth metal chloride of cosolvent, remove yet the moisture in the alkaline earth metal chloride crystal grain is often extremely difficult.
prior art generally uses following two kinds of methods that aforementioned alkaline earth metal chloride is carried out drying: the one, and heated-air drying; The 2nd, vacuum drying; The former (instant heating is air-dry dry) is dry to alkaline earth metal chloride through the hot blast more than 200 ℃; Water content through dried alkaline earth metal chloride is about 2%, and this method obviously is difficult to make the degree of drying of alkali earth chloride to satisfy the requirement that is tending towards over dry.Latter's (being vacuum drying) need more than the dry 8h, just get alkaline earth metal chloride so that moisture content is controlled at less than 0.1% under greater than 350 ℃ high temperature.
obviously back a kind of in aforementioned two kinds of drying modes are that the vacuum drying mode can show the desirable drying effect to alkali earth chloride for preceding a kind of heated-air drying mode, but energy resource consumption is big in dry run, production efficiency is low and long-time high temperature drying is prone to cause calcium chloride to decompose to produce its shortcoming of hydrogen chloride gas system.
In view of above-mentioned prior art; The applicant has carried out literature search; Yet in disclosed domestic and abroad patent and non-patent literature, all do not disclose the enlightenment that is able to remedy aforementioned heated-air drying and vacuum drying technological deficiency, the applicant has done actively and good try for this reason, and under the secrecy provision of strictness, has done experiment in applicant unit; It is practicable that the result proves, and the technical scheme that will introduce below produces under this background
Summary of the invention
top priority of the present invention is to provide a kind of alkali earth chloride continuous quick drying and use and embody energy savings and improve drying efficiency, help significantly reducing the decomposition of alkali earth chloride and use the continous vacuum microwave drier that the polymerization that ensures PPTA and copolymer thereof required and be of value to the homogeneity of promoting the polymeric molecular weight distribution that polymerization obtains at low temperatures and under vacuum state that helps to make.
another task of the present invention is to provide the drying means of a kind of continous vacuum microwave drier to alkaline earth metal chloride, and this method can realize the continuous drying of alkaline earth metal chloride and can ensure comprehensive embodiment of the technique effect of continous vacuum microwave drier.
Top priority of the present invention is accomplished for embodying in
; Technical scheme provided by the invention is: a kind of continous vacuum microwave drier; Comprise vacuum continuous feed mechanism, vacuum microwave drying device, vacuum drying cabinet and the continuous discharging mechanism of vacuum; The vacuum microwave drying device is arranged on the vacuum drying cabinet, carries out vacuum microwave drying to being incorporated into the indoor material of vacuum drying, and vacuum drying cabinet is connected with vacuum system; The vacuum continuous feed mechanism is connected with the vacuum drying cabinet feeding mouth on an end top of vacuum drying cabinet, and the continuous discharging mechanism of vacuum is connected with the vacuum drying cabinet discharging opening of the other end bottom of vacuum drying cabinet.
are in a concrete embodiment of the present invention; Described vacuum continuous feed mechanism comprises a high hopper; The top of this high hopper is equipped with one and is used for material is incorporated into first charging aperture in the high hopper cavity volume of high hopper; And being equipped with one, the downside of high hopper is used for first discharging opening that the material in the said high hopper cavity volume is drawn; On this first discharging opening, be equipped with one first baiting valve, and on described high hopper, also be equipped with one first stirring unit; One intermediate bunker; The top of this centre material has one second charging aperture; And the bottom has one second discharging opening; Second charging aperture and described first baiting valve connect, and wherein, on intermediate bunker, also are equipped with one and are used for second stirring unit that the material in the intermediate bunker cavity volume of middle feed bin is stirred; At least one powder feeder, this powder feeder and said second discharging opening connect, and connect with the vacuum drying cabinet feeding mouth of said vacuum drying cabinet.
are in another concrete embodiment of the present invention; Described first stirring unit comprises that first motor, first reductor, first stir material ribbon axle and first and stir the material ribbon; First motor and first reductor connect; And together with the top of first motor bearing at said high hopper, first stirs the upper end and first reductor of expecting the ribbon axle is in transmission connection by first reductor, and the lower end is stretched in the high hopper cavity volume; And be bearing in the bottom of high hopper cavity volume rotationally; First stirs the material ribbon is arranged on first and stirs on the material ribbon axle and be positioned at the high hopper cavity volume, and described first baiting valve is a vacuum powder valve, and described powder feeder is the vane type powder feeder with cleaning function.
are in another concrete embodiment of the present invention; Described second stirring unit comprises second motor, second reductor, material-stirring shaft and paddle; Second motor and second reductor connect, and are fixed on level on the sidewall of intermediate bunker together with second motor by second reductor, and material-stirring shaft is positioned at described intermediate bunker cavity volume with level; And be in transmission connection with said second reductor, paddle is formed on the material-stirring shaft.
are in another concrete embodiment of the present invention; The quantity of described vacuum microwave drying device is 5-20; Be arranged on the top of said vacuum drying cabinet, each vacuum microwave drying utensil has many resonators drier, and many resonators drier is made up of horn radiator and magnetron vibrator; The horn radiator matches with the magnetron vibrator, and corresponding to described vacuum drying cabinet; The length of described vacuum drying cabinet is 10-12m, and is connected with vacuum system through vacuum port.
also have among the concrete embodiment of the present invention; On described vacuum drying cabinet, be equipped with a pay-off; This pay-off comprises that the 3rd motor, the 3rd reductor, second stir material ribbon axle and second and stir ribbon; The 3rd motor and the 3rd reductor connect; And by the 3rd reductor together with the 3rd motor be fixed on vacuum drying cabinet on the outer wall of an end of said vacuum drying cabinet feeding mouth, second stirs material ribbon axle, and to be positioned at vacuum drying indoor, one of which end and the 3rd reductor are in transmission connection; The other end is bearing in vacuum drying cabinet rotationally on the inwall of an end of said vacuum drying cabinet discharging opening, and second stirs the material ribbon is arranged on second and stirs on the material ribbon axle.
are more of the present invention and among concrete embodiment; The continuous discharging mechanism of described vacuum comprises a discharging intermediate bunker and a finished product bin; The 3rd charging aperture of discharging intermediate bunker is connected with described vacuum drying cabinet discharging opening, and is equipped with one second baiting valve on the 3rd discharging opening of discharging intermediate bunker, and on the discharging intermediate bunker, also is equipped with one the 3rd stirring unit; The top of finished product bin has one the 4th charging aperture; The 4th charging aperture and described second baiting valve connect, and the following side of finished product bin is equipped with one the 3rd baiting valve, and on finished product bin, are equipped with one second stirring unit; Described second stirring unit comprises that the 4th motor, the 4th reductor, the 3rd stir material ribbon axle and the 3rd and stir the material ribbon; The 4th motor and the 4th reductor connect; And be fixed on the top of said finished product bin by the 4th reductor together with the 4th motor, the 3rd stirs material ribbon axle is positioned at finished product bin, the 3rd stir material ribbon axle upper end and the 4th reductor is in transmission connection; And the lower end is bearing on the diapire in the finished product bin rotationally, and the 3rd stirs the material ribbon is arranged on the 3rd and stirs on the material ribbon axle.
are for embodying another task of the present invention of accomplishing; Technical scheme provided by the invention is: a kind of continous vacuum microwave drier is to the drying means of alkaline earth metal chloride; It is the high hopper adding alkaline earth metal chloride to the vacuum continuous feed mechanism; Under the state of rotating speed of first stirring unit of control high hopper with intermittence blowing mode be discharged in the intermediate bunker; And it is indoor under the state of the rotating speed of the rotating speed of second stirring unit of control intermediate bunker and control powder feeder, the alkaline earth metal chloride in the intermediate bunker to be introduced vacuum drying from the vacuum drying cabinet feeding mouth of vacuum drying cabinet; Meanwhile; The work of vacuum microwave drying device; In microwave frequency is that 2420-2480MHz and microwave output power are to being incorporated into the indoor dry materials of vacuum drying under the state of 25-50kw; And vacuum, baking temperature and the alkaline earth metal chloride of control vacuum drying cabinet are in the indoor time of staying of vacuum drying; Indoor alkaline earth metal chloride is introduced in the discharging intermediate bunker of the continuous discharging mechanism of vacuum from the vacuum drying cabinet discharging opening of vacuum drying cabinet with vacuum drying under the state of rotating speed of the pay-off of control vacuum drying cabinet, once the alkaline earth metal chloride in the intermediate bunker is introduced in the finished product bin by the 3rd stirring unit of discharging intermediate bunker, and obtaining moisture content is the dry product alkaline earth metal chloride of 0.075-0.085%.
in of the present invention and then concrete embodiment, the rotating speed of first stirring unit of described control high hopper is that rotating speed is controlled to be 5-10n/min; Described intermittence blowing be meant every at a distance from the 14-16min blowing once; The rotating speed of described control second stirring unit is that rotating speed is controlled to be 3-10n/min; The rotating speed of described control powder feeder is that rotating speed is controlled to be 14-16n/min.
are of the present invention again more and among concrete embodiment; The vacuum of described control vacuum drying cabinet, baking temperature and control alkaline earth metal chloride in the indoor time of staying of vacuum drying be vacuum degree control is-0.01~-0.08MPa; Baking temperature is controlled to be 150-250 ℃, and the time of staying is controlled to be 20-40min; The rotating speed of described control pay-off is that rotating speed is controlled to be 5-30n/min.
technical scheme provided by the invention has the advantages that vacuum drying and microwave drying are helped mutually; Under vacuum condition, utilize microwave drying; Vacuum drying has guaranteed that material can carry out drying under cryogenic conditions; And the microwave drying material has instantaneous high efficiency, thereby can realize the rapid Continuous low temperature drying of material and help energy savings and improve drying efficiency; Vacuum microwave drying can make the moisture that is difficult to volatilize of alkaline earth metal chloride be rapidly heated and under vacuum state, deviate from moisture fast; Be of value to the decomposition that reduces alkaline earth metal chloride and use the polymerization requirement that ensures PPTA and copolymer thereof, make the polymeric molecular weight distribution homogeneous that obtains; The method that provides can make alkaline earth metal chloride realize continuous drying and have desirable drying effect (moisture content 0.075-0.085%).
Description of drawings
Fig. 1 is the embodiments of the invention structure chart.
Fig. 2 is the sketch map of second stirring unit shown in Figure 1.
The specific embodiment
can be expressly understood technical spirit of the present invention and beneficial effect more for the auditor that the makes Patent Office especially public; The applicant general elaborates with the mode of embodiment below; But the description to embodiment all is not the restriction to the present invention program, any according to the present invention design done only for pro forma but not substantial equivalent transformation all should be regarded as technical scheme category of the present invention.
see also Fig. 1 and Fig. 2, in Fig. 1, have provided vacuum continuous feed mechanism 1, and this vacuum continuous feed mechanism 1 comprises high hopper 11, intermediate bunker 12 and powder feeder 13; High hopper 11 also can be claimed high-order batch can; Its volume is 500-1000L, is 750L in the present embodiment, and the volume that is to say the high hopper cavity volume 111 of this high hopper 11 is 750L; Has one first charging aperture 112 at the top of high hopper 11; And the following side has one first discharging opening 113, and on this first discharging opening 113, is equipped with one first baiting valve 1131, and this first baiting valve 1131 is for adopting the high vacuum powder valve of wear-resisting alloy steel material.On high hopper 11, also be equipped with one first stirring unit 114; This first stirring unit 114 comprises that first motor 1141, first reductor 1142, first stir material ribbon axle 1143 and first and stir material ribbon 1144; First motor 1141 and first reductor 1142 connect; And be fixed on together with first motor 1141 by first reductor 1142 on the outer wall at top of high hopper 11; First stirs the high hopper cavity volume 111 that material ribbon axle 1143 is positioned at high hopper 11, and particularly, this first stirs the upper end of material ribbon axle 1143 and the final stage power output shaft of first reductor 1142 is in transmission connection; And the lower end is bearing in the bottom of high hopper cavity volume 111 rotationally, and first stirs material ribbon 1144 is arranged on first and stirs on the material ribbon axle 1143.First stir material ribbon 1144 rotating speed be 5-10n/min, and and the inwall of the high hopper cavity volume 111 of high hopper 11 between keep 5-10 ㎜ the gap, be preferably 3-5 ㎜.First stir material ribbon axle 1143 diameter be 50-80 ㎜, first stir material ribbon 1144 pitch be 0.3-0.5D, first stir material ribbon 1144 rotating speed be 3-10n/min, first stir material ribbon 1144 loading less than 50%, preferred 35%.
are when 1141 work of first motor; Drive first reductor 1142; Slow down and drive first through first reductor 1142 and stir material ribbon axle 1143 and stir material ribbon axle 1143 by first simultaneously and drive first and stir material ribbon 1144, send thereby the material of being introduced by first charging aperture 112 is driven towards the direction of first baiting valve 1131.Here the alkaline earth metal chloride as cosolvent of alleged material in PPTA and copolymer polymerization process thereof, adding, alkaline earth metal chloride such as calcium chloride or lithium chloride etc.
are asked for an interview Fig. 2 and are continued to combine Fig. 1; Batch can in the middle of aforesaid intermediate bunker 12 also can be described as; The top of this intermediate bunker 12 has one second charging aperture 121; This second charging aperture 121 connects with aforesaid first baiting valve 1131, and the bottom of intermediate bunker 12 has one second discharging opening 122.In the intermediate bunker cavity volume 123 of intermediate bunker 12, be provided with one second stirring unit 124; This second stirring unit 124 comprises second motor 1241, second reductor 1242, material-stirring shaft 1243 and paddle 1244; Second motor 1241 and 1242 transmissions of second reductor connect; And be fixed on the outer wall of intermediate bunker 12 with level together with second motor 1241 by second reductor 1242; Material-stirring shaft 1243 is positioned at the intermediate bunker cavity volume 123 of intermediate bunker 12 with level; The one of which end is that the left end and second reductor 1242 of location status shown in Figure 2 is in transmission connection, and constitutes cantilever end and the other end is the right-hand member of location status shown in Figure 2, and paddle 1244 is formed in or claims to be fixed in the cantilever end of material-stirring shaft 1243.Preferably, pneumatic ram 1245 (Fig. 2 shows) is set in the following side of intermediate bunker 12.Wherein, the rotating speed of first motor 1241 is controlled at 5-10n/min.
Fig. 1 please be continued to see in
; Above mentioned powder feeder 13 has a pair of in the present embodiment; Connect aforesaid second discharging opening 122 and below between the vacuum drying cabinet feeding mouth 31 of the vacuum drying cabinet 3 that also will describe; Preferably, powder feeder 13 is vane type powder feeder (also can claim vane type powder feeder), and charging capability or title charging rate are 150-200kg/h.In the present embodiment, powder feeder 13 preferably but not definitely use the trade mark by the production and sales of Electromechanical Technology Co., Ltd of Jiangsu Province, China Changzhou Xinlan to be YCD type feeder with being limited to.
The quantity of the vacuum microwave drying device 2 that provides among
Fig. 1 is 5-20; But be preferably 15, be located at the top of vacuum drying cabinet 3, each vacuum microwave drying device 2 comprises the drier of resonator more than one 21; Each many resonators drier 21 is made up of horn radiator 211 and magnetron vibrator 212; Produce microwave through magnetron vibrator 212, by horn radiator 211 microwave is conducted to the material surface again, promptly to the dry materials in the vacuum drying cabinet 3.
The length of the vacuum drying cabinet 3 that
are shown in Figure 1 is preferably 10-15m, and diameter is 1-2m, and the time of staying of material in vacuum drying cabinet 3 is preferably 20-40min, and the baking temperature of vacuum drying cabinet 3 is controlled between 150-250 ℃.The vacuum drying cabinet feeding mouth 31 of vacuum drying cabinet 3 is connected with aforesaid powder charge door 13, and the material that will come from powder feeder 13 by this vacuum drying cabinet feeding mouth 31 is introduced in the vacuum drying cabinet 3.The vacuum drying cabinet discharging opening 32 of vacuum drying cabinet 3 is connected with the continuous discharging mechanism 4 of the following vacuum that also will describe in detail.The vacuum port 33 of vacuum drying cabinet 3 is connected with vacuum system.On vacuum drying cabinet 3, be equipped with a pay-off 34.
preferably but not the pay-off 34 that definitely is limited to comprises that the 3rd motor 341, the 3rd reductor 342, second stir material ribbon axle 343 and second and stir material ribbon 344; The 3rd motor 341 cooperates with 342 transmissions of the 3rd reductor; And be fixed on the end towards vacuum drying cabinet feeding mouth 31 of vacuum drying cabinet 3 with level together with the 3rd motor 341 by the 3rd reductor 342; Second stirs material ribbon axle 343 is positioned at vacuum drying cabinet 3 with level; This second stir material ribbon axle 343 an end be that the left end shown in Figure 1 and the final stage power output shaft of the 3rd reductor 342 are in transmission connection, and the other end to be right-hand member be bearing on the wall body of vacuum drying cabinet 3 rotationally.Second stirs material ribbon 344 is located at second and stirs on the material ribbon axle 343.
The continuous discharging mechanism 4 of
above mentioned vacuum comprises discharging intermediate bunker 41 and finished product bin 42; The 3rd charging aperture 411 at the top of discharging intermediate bunker 41 connects with the vacuum drying cabinet discharging opening 32 of aforesaid vacuum drying cabinet 3; And be equipped with one second baiting valve 4121 on the 3rd discharging opening 412 of the bottom of discharging intermediate bunker 41, on discharging intermediate bunker 41, be equipped with a structure, set-up mode and effect and the 3rd identical stirring unit 413 of aforesaid second stirring unit 124.
The top side portion of
aforesaid finished product bin 42 constitutes one the 4th charging aperture 421; The 4th charging aperture 421 is connected with aforesaid second baiting valve 4121, is that the position of discharging opening is equipped with one the 3rd baiting valve 422 in the following side of finished product bin 42.And on finished product bin 42, be equipped with one second stirring unit 423.
preferred but not second stirring unit 423 that be limited to comprises that the 4th motor 4231, the 4th reductor the 4232, the 3rd stir material ribbon axle the 4233 and the 3rd and stir material ribbon 4234; The 4th motor 4231 cooperates with 4232 transmissions of the 4th reductor; And be fixed on the top of finished product bin 42 together with the 4th motor 4231 by the 4th reductor 4232; The 3rd stirs material ribbon axle 4233 is positioned at finished product bin 42; The 3rd stir material ribbon axle 4233 upper end and the 4th reductor 4232 is in transmission connection, and the lower end is bearing in the bottom of finished product bin 42 rotationally, the 3rd stirs material ribbon 4234 is provided in the 3rd and stirs and expect on the ribbon axle 4233.
applicant combines Fig. 1 to narrate use of the present invention, and the volume of supposing high hopper 11 is 750L, and the volume of intermediate bunker 12 is 100L; First stir material ribbon axle 1143 diameter be 65 ㎜, first stir material ribbon 1144 diameter be 350 ㎜, first gap stirred between the inwall of material ribbon 1144 and high hopper 11 is 3 ㎜; And first stir the material ribbon 1144 pitch be 0.3-0.5D; Many resonators drier 21 has 15 groups, vacuum drying cabinet 3 length 12m, and diameter is 1.5m; The volume of discharging intermediate bunker 14 is 100L, and the volume of finished product bin 42 is 1000L.
Embodiment 1:
combine Fig. 1 and Fig. 2.
The volume of the high hopper 11 of the vacuum continuous feed mechanism 1 of
present embodiment is 750L, and the volume of intermediate bunker 12 is 100L, and the diameter that first of first stirring unit 114 stirs material ribbon axle 1143 is 65 ㎜; First stir the material ribbon 1144 diameter be 350 ㎜; First gap stirred between the inwall of high hopper cavity volume 111 of material ribbon 1144 and high hopper 11 is 3 ㎜, and wherein first to stir the pitch of expecting ribbon 1144 be 0.3-0.5D, and the quantity of many resonators drier 21 is 15 groups; The length of vacuum drying cabinet 3 is at 12 ㎜; Diameter is at 1.5 ㎜, and the volume of discharging intermediate bunker 41 is 100L, and the volume of finished product bin 42 is 1000L.
The alkaline earth metal chloride of
present embodiment is a calcium chloride; Dry run is following: in high hopper 11, add 300kg calcium chloride, the rotating speed that material ribbon 1144 is stirred in control first is 5n/min, and every separated 15min blowing once arrives intermediate bunker 12; The rotating speed of controlling second motor 1241 of second stirring unit 124 is 5n/min; The rotating speed of control powder feeder 13 is 15n/min, the rotating speed 5n/min of the 3rd motor 341 of control pay-off 34, and control second stir material ribbon 344 loading be 25%; 175 ℃ of the temperature of control hothouse 3; Vacuum-0.095MPa, every at a distance from 15min from discharging intermediate bunker 41 blowings once in finished product bin 42, final calcium chloride moisture content is 0.075%.
Embodiment 2:
The parameter of
vacuum microwave drying device that present embodiment adopted is identical with embodiment 1.
Alkaline earth metal chloride changes lithium chloride into; Dry run is following: in high hopper 11, add the 300kg lithium chloride, the rotating speed that material ribbon 1144 is stirred in control first is 5n/min, and every separated 15min blowing once arrives in the intermediate bunker 12; The rotating speed of second motor 1241 of second stirring unit 124 of control intermediate bunker 12 is 5n/min; The rotating speed of control powder feeder 13 is 15n/min, the rotating speed 5n/min of the 3rd motor 341 of control pay-off 34, and control second stir material ribbon 344 loading be 25%; 175 ℃ of the temperature of control hothouse 3; Vacuum-0.095MPa, every at a distance from 15min from discharging intermediate bunker 41 blowings once in finished product bin 42, final lithium chloride moisture content is 0.085%