CN101776372B - Nitrogen closed cycle drying and solvent recovery system - Google Patents
Nitrogen closed cycle drying and solvent recovery system Download PDFInfo
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- CN101776372B CN101776372B CN2010103008929A CN201010300892A CN101776372B CN 101776372 B CN101776372 B CN 101776372B CN 2010103008929 A CN2010103008929 A CN 2010103008929A CN 201010300892 A CN201010300892 A CN 201010300892A CN 101776372 B CN101776372 B CN 101776372B
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Abstract
The invention relates to a nitrogen closed cycle drying and solvent recovery system comprising a dryer, a condensing device, a solid-gas separator, a circulating fan, a nitrogen heater, a solvent recovery tank and a nitrogen supply pipe, wherein the dryer is a fluidized bed dryer; an exhaust outlet of the fluidized bed dryer is connected with an air inlet of the condensing device through a pipeline; an air outlet of the condensing device is connected with the solid-gas separator; an air outlet of the solid-gas separator is connected with the circulating fan; air output by the circulating fan is delivered to the nitrogen heater for heating, and heated nitrogen is delivered to the dryer; a solvent collection opening of the condensing device is connected with the solvent recovery tank; cooling mediums of the condensing device and the solvent recovery tank are provided by cooling liquid supply pipes; and a feed port of the fluidized bed dryer is provided with a material seal type screw feeder. The invention realizes the production of a fluidized drying industry with continuous feeding and discharging and the recovery of an organic solvent without waste gas and water discharge and is beneficial to environmental protection.
Description
Technical field
The present invention relates to closed cycle drying and solvent recovering system.
Background technology
To having easily oxidizable, eutectic thermal sensitivity and contain the drying of organic solvent material, as continue to use traditional vacuum drier, in vacuum intermittently drying production process, because exhaust gas discharging can cause environmental pollution.The Chinese patent Granted publication number be the utility model patent specification of CN 2816709Y disclosed be a kind of closed circuit cycle centrifugal spray drier, comprise successively the gas heater, centrifugal spray drying tower and the cyclone separator that connect, and airtight hydrofuge machine, spray column, condenser, solid and gas separator, airtight air blast; The air inlet of gas heater also links for pipe with the inert gas of outside.China's Granted publication number is the disclosed a kind of circulating drying device of utility model patent specification of CN 2876648Y, comprises drying tower, gravitation tank, air cleaner, heater and cyclone separator, nitrogen pot, spray recovery tower, refrigerator and circulating fan.Above-mentioned two utility models are eliminated the detonation factor because the employing hot inert gas is the drying medium hot-air, and the inert gas sealing and circulating is used.Owing to be closed cycle, the harmful substance that organic solvent contains is unlikely and leaks, and avoids atmosphere pollution simultaneously, and the organic solvent that reclaims can be used.But because centrifugal spray drying is to be atomized into vaporific through centrifugal spray apparatus liquid state (solid content is 28～32%) material, heat through high temperature, in the moment evaporation of will wetting part, so that obtain the powder shaped finished product, be not suitable for the drying production of solid shape wet stock, in addition, centrifugal spray drying adopts the processing method of spray washing neutralization to the organic solvent of the gasification of being heated for this reason, be converted into waste water with waste gas, so still there is the environmental problem of sewage disposal.China's Granted publication number is the disclosed a kind of closed cycle filtration washing boiling drier of utility model patent specification of CN 201181147Y, its main frame is a kind of vertical boiling drier, having is linked in sequence from top to bottom by upper shell, hopper and lower shell constitutes the cylindrical shell of a drier host machine, be provided with the side agitator in the described hopper, its solvent closed cycle recovery system comprises cyclone separator, condensing unit, blower fan and heater.The fluidized drying of above-mentioned closed cycle filtration washing boiling drier is intermittent operation, and a batch production treating capacity has limitation.Need to vacuumize processing in addition, very limited to solvent collection, so still there is the problem of exhaust-gas treatment.
Summary of the invention
The objective of the invention is to propose a kind of nitrogen closed cycle fluidized drying and solvent recovering system that reclaims solvent, favorable environment protection effectively; Further purpose of the present invention is further to improve the fluidized drying effect.
For achieving the above object, the present invention takes following technical scheme:
The present invention has drying machine, condensing unit, solid and gas separator, circulating fan, nitrogen heater, solvent recovery jar and nitrogen for pipe; Described drying machine is a fluid bed dryer, the exhaust outlet of fluid bed dryer is connected with the air inlet of described condensing unit by pipeline, the air outlet of condensing unit is connected with described solid and gas separator by pipeline, the air outlet of solid and gas separator is connected with described circulating fan by circulating line, the wind of circulating fan output is delivered to described nitrogen heater heating, and the nitrogen after the heating is delivered in the drying machine; Described nitrogen is connected with circulating line for pipe; The solvent collection mouth of described condensing unit (2) is connected by the inlet of pipeline with the solvent recovery jar, and described condensing unit and solvent recovery jar provide cooling medium by cooling fluid for pipe; The charging aperture of described fluid bed dryer is equipped with material envelope type screw feeder; Described condensing unit comprises housing, the housing two ends are respectively equipped with air inlet and gas outlet, own air inlet is provided with filtration members, condenser and retaining liquid assembly successively in the housing to the gas outlet, below condenser and retaining liquid assembly, be provided with collecting tank, lower housing portion is provided with cooling fluid feed liquor house steward, housing top is provided with cooling fluid fluid house steward, and the bottom of collecting tank is provided with the solvent collection pipe that leads to hull outside; Described condenser has cooling fin and the numerous snakelike coolant pipe that be arranged in parallel, be distributed with the cooling fluid pore on the cooling fin, the straight-tube portion of every coolant pipe is in the cooling fluid hole of all cooling fin correspondence positions, and the two ends of every snakelike coolant pipe are connected with cooling fluid fluid house steward with cooling fluid feed liquor house steward respectively; For forming to the stream waveform retaining liquid unit that connects into before and after the upright single-piece of " going into " font, retaining liquid forms the stream undulating path between the unit to described retaining liquid assembly by several cross sections.
Described fluid bed dryer comprises the airflow-distribution board that is in middle part in the casing, be in the air-flow distribution air ducting of bottom and be in the dedusting filter on top, be respectively equipped with feed hopper and discharging opening on the casing position of corresponding fluidized-bed layer upper and lower part, discharge valve is installed on the discharging opening; Described airflow-distribution board is that the hole is to different airflow-distribution boards, airflow-distribution board is divided into by inclined hole district and straight hole interval every several porose areas that are provided with by feed end to discharge end, the porose area at the two ends of airflow-distribution board is the inclined hole district and is the inclined hole district, little inclination angle of incline direction unanimity, remaining inclined hole district is inclined hole district, big inclination angle, and the inclined hole incline direction that is in the inclined hole district, big inclination angle of both sides, same straight hole district is opposite.
All between 1.5 millimeters to 2.5 millimeters, the percent opening of whole airflow-distribution board is 4% to 6% for the inclined hole aperture in the straight hole aperture in described straight hole district, big inclined hole district, inclination angle and the inclined hole aperture in inclined hole district, little inclination angle.
The area in described straight hole district, inclined hole district, little inclination angle is identical, and big inclined hole district, inclination angle area is 50% of a straight hole district area.
The size at the inclined hole inclination angle in inclined hole district, described big inclination angle is between 60 to 80 degree, and the size at the inclined hole inclination angle in inclined hole district, little inclination angle is between 40 to 50 degree.
The dedusting filter of described fluid bed dryer is a vapour-pressure type filter bag dedusting filter, comprise cylinder, filter bag frame, filter bag and be fixed on card on the cabinet wall, described cylinder seal is fixed on the casing top, the pull bar of cylinder stretches in the casing and is connected with described filter bag frame, sealing and fixing has some unlimited filter bags suitable for reading on the filter bag frame, corresponding each filter bag is provided with locating hole on the card, and the end opening of filter bag is enclosed within on the locating hole aperture.
The position of the corresponding fluidized-bed layer of the casing of described fluid bed dryer is provided with actuating doors, and actuating doors is provided with the automatically cleaning visor.
The inward at both ends bending of the front portion of the upright single-piece of described condensing unit; Described upright single-piece is formed by the concave-convex Sheet Metal Processing.
Described material envelope type screw feeder has housing, motor decelerating mechanism, be provided with the main shaft that drives by motor decelerating mechanism in the housing, the front end end face of housing is provided with loading hopper, be provided with guard grating and anti-bridge formation device in the loading hopper, bottom surface, housing rear end is provided with discharging opening, and the leading portion of main shaft is a spiro rod section, and it is reduction stage that the back segment of main shaft is provided with broken blade, the intersection of the top of housing and the spiro rod section of corresponding main shaft and the reduction stage formation protuberance that raises up, thus material envelope space in housing, formed.
The present invention has following good effect:
1, the present invention adopts nitrogen closed cycle continuous fluid drying mode; be applicable to the drying that contains organic solvent non-oxidizability wet stock; realize the production of fluidized drying industry and the Recovery of Organic Solvent of continuous charging and discharging; with nitrogen is the closed cycle of conduction heat transfer medium; carry out gas shield for the easily oxidizable material, eliminate the accident potential of detonation factor, in the time of production process; adopt the condensation type of cooling, organic solvent is reclaimed.The present invention does not have the waste gas discharge of wastewater, helps environmental protection.
2, the airflow-distribution board of fluid bed dryer of the present invention is that the hole is to different airflow-distribution boards, its two ends are inclined hole districts, little inclination angle, the inclined hole incline direction in inclined hole district, two little inclinations angle is consistent, impetus by thermal current percolation airflow-distribution board advances by feed end wet stock to discharge end.Adopting the straight hole district is opposite with the inclined hole incline direction of inclined hole interval every the inclined hole district, big inclination angle of setting and both sides, straight hole district, be impetus equally by thermal current percolation airflow-distribution board, and promote material in the other direction to flowing, the continuity material reaches good fluidized drying effect in the time of staying of dry run.
3, the dedusting filter of fluid bed dryer of the present invention is a vapour-pressure type filter bag dedusting filter, drive the filter bag frame and then drive the filter bag shake by cylinder, as adopt the dedusting of conventional pulsed filtrating equipment of the filter bag, can in the pulse dust removal process, impact to intrasystem air pressure, so adopt vapour-pressure type filter bag dedusting filter then can keep system's internal gas pressure steady, help the service equipment ordinary production, reduce injury filter bag.
4, the function of condensing unit collection filtration of the present invention, condensation, condenser adopts the spiral coil cooling tube of large-area cooling fin and minor diameter, has increased the cold scattering surface area greatly.Retaining liquid assembly is formed to the stream waveform retaining liquid unit that connects into before and after adopting upright single-piece, make retaining liquid assembly have the stream undulating path, the inward at both ends bending of the front portion of upright single-piece, and uprightly single-piece is formed by the concave-convex Sheet Metal Processing, and the moulding of above-mentioned retaining liquid unit and retaining liquid assembly labyrinth shape structure had both enlarged gasifying gas heat exchange area of dissipation, having good dew drips and compiles effect, the solvent recovering rate height, and make the condensing unit compact conformation, reduced floor space.
5, material envelope type screw feeder of the present invention in use, utilize material to be deposited in naturally that housing raises up and in form one material envelope space, form shutoff, obstruct nitrogen leaks, stablizing of maintenance system internal pressure, this material envelope type screw feeder is simple in structure, easy to use, not fragile.
Description of drawings
For the easier quilt of content of the present invention is clearly understood, according to specific embodiment also in conjunction with the accompanying drawings, the present invention is further detailed explanation, wherein below
Fig. 1 is the whole diagrammatic sketch of present embodiment;
Fig. 2 is the fluid bed dryer diagrammatic sketch;
Fig. 3 is the airflow-distribution board diagrammatic sketch of fluid bed dryer;
Fig. 4 is the enlarged drawing of one jiao of airflow-distribution board;
Fig. 5 is the sectional view in inclined hole district, the little inclination angle of local Zhao airflow-distribution board of the E-E cutaway view of Fig. 3;
Fig. 6 is the sectional view in local Zhao airflow-distribution board straight hole district of the E-E cutaway view of Fig. 3;
Fig. 7 is the sectional view in inclined hole district, a kind of big inclination angle of local Zhao airflow-distribution board of the E-E cutaway view of Fig. 3;
Fig. 8 is the another kind of sectional view in inclined hole district, inclination angle greatly of local Zhao airflow-distribution board of the E-E cutaway view of Fig. 3;
Fig. 9 is the condensing unit diagrammatic sketch;
Figure 10 is a condenser diagrammatic sketch in the condensing unit;
Figure 11 is the vertical view of Figure 10;
Figure 12 is a retaining liquid assembly diagrammatic sketch in the condensing unit;
Figure 13 is the II portion enlarged drawing of Fig. 9;
Figure 14 is the F-F cutaway view of Figure 12;
Figure 15 is the I portion enlarged drawing of Figure 14;
Figure 16 is a material envelope type screw feeder diagrammatic sketch;
Figure 17 is that the A of Figure 16 is to view.
The specific embodiment
Embodiment 1
Shown in Figure 1, present embodiment has fluid bed dryer 1, condensing unit 2, solid and gas separator 3, circulating fan 4, nitrogen heater 5, solvent recovery jar 6, expects that envelope type screw feeder 7, nitrogen supply pipe 10 for pipe 8, cooling fluid for pipe 9, steam.
The exhaust outlet of described fluid bed dryer 1 is connected by the air inlet of pipeline with described condensing unit 2, the air outlet of condensing unit 2 is connected with described solid and gas separator 3 by pipeline, the air outlet of solid and gas separator 3 is connected with described circulating fan 4 by circulating line 11, the wind of circulating fan 4 outputs is delivered to described nitrogen heater 5 heating by pipeline, and the nitrogen after the heating is delivered in the drying machine 1 by pipeline.The circulating line 11 that connects solid and gas separator 3 and circulating fan 4 is provided with Hand-operated butterfly valve 13 and drain, is connected with manual atmospheric valve 14 on the drain.The pipeline that connects circulating fan 4 and nitrogen heater 5 is provided with another drain, and another drain is provided with Pneumatic butterfly valve 15.Described nitrogen is connected circulating line 11 for pipe 8 and is on the position between Hand-operated butterfly valve 13 and the circulating fan 4.Described nitrogen heater 5 supplies pipe 10 saturated vapors that provide as heat medium by steam.The cooling liquid inlet of the cooling liquid inlet of described condensing unit 2, described solvent recovery jar 6 all is connected for pipe 9 with described cooling fluid, and cooling fluid provides chilled brine for pipe 9.The chilled brine that comes out from condensing unit 2 and solvent recovery jar 6 imports liquid circulation house steward 9-1.Solvent recovery jar 6 is provided with balance pipe 17 in addition.The solvent collection mouth of described condensing unit 2 is connected with the inlet of solvent recovery jar 6 by pipe.
The charging aperture of described fluid bed dryer 1 is equipped with material envelope type screw feeder 7.
See Fig. 2 to Fig. 8, the casing top of described fluid bed dryer 1 is provided with venting of dust explosion film 1-9, exhaust outlet 1-10 and cleans door 1-8.The position of corresponding fluid bed is provided with actuating doors 1-7 on the casing of described fluid bed dryer 1, and actuating doors 1-7 is provided with automatically cleaning visor 1-6.Automatically cleaning visor 1-6 glass inner side face has scraper plate, is used for the medial surface of cleaning glass, sees through automatically cleaning visor 1-6 and can clearly observe the interior fluidisation situation of drying machine.
Be provided with the airflow-distribution board 1-1 that is in the middle part in the casing, be in the air-flow distribution air ducting 1-3 of bottom and be in the dedusting filter 1-2 on top, be respectively equipped with feed hopper 1-4 and discharging opening on the casing of corresponding fluidized-bed layer upper and lower part, discharge valve 1-5 is installed on the discharging opening.
Described airflow-distribution board 1-1 is that the hole is to different airflow-distribution boards, airflow-distribution board 1-1 is divided into by inclined hole district and straight hole interval every several porose areas that are provided with along feed end to discharge end, airflow-distribution board 1-1 two ends are that the porose area of feed end and discharge end is the inclined hole district and is little inclination angle inclined hole district c, remaining inclined hole district is big inclination angle inclined hole district b, and the inclined hole incline direction that is in the big inclination angle inclined hole district b of a both sides, same straight hole district is opposite.
The size of the inclined hole inclined angle alpha of described big inclination angle inclined hole district b is between 60 to 80 degree, and the size of the inclined hole angle of inclination beta of little inclination angle inclined hole district c is between 40 to 50 degree.All between 1.5 millimeters to 2.5 millimeters, the percent opening of airflow-distribution board is at 4 % to 6% for the inclined hole aperture of the straight hole aperture of described straight hole district a, big inclined hole district, inclination angle b and the inclined hole aperture of little inclination angle inclined hole district c.Here the percent opening of indication is the percentage of all orifice area sums and airflow-distribution board surface area on the airflow-distribution board surface.The width H of described straight hole district a, little inclination angle inclined hole district c is identical, so area is identical.The width h of big inclined hole district, inclination angle b is half of width H of straight hole district a, so the area of big inclined hole district, inclination angle b is 50% of a straight hole district a area.
Embodiment shown in the figure is divided into 11 porose areas at airflow-distribution board 1-1, pore dislocation on all porose areas is arranged, the aperture is adopted 1.8 millimeters, the porose area at two ends is that angle of inclination beta is the little inclination angle inclined hole district c of 45 degree, its incline direction be from feed end to discharge end promptly along the throughput direction of material, be straight hole district a successively from feed end to discharge end between the two little inclination angle inclined hole district c, inclined angle alpha is 10 degree big inclination angle inclined hole district b1, straight hole district a, inclined angle alpha is-75 degree big inclination angle inclined hole district b2, straight hole district a, inclined angle alpha is+75 degree big inclination angle inclined hole district b1, straight hole district a, inclined angle alpha is-75 degree big inclination angle inclined hole district b2, straight hole district a.Promoting material by the thermal current by little inclination angle inclined hole district c flows forward, when material is in straight hole district a, the translational speed of can loweing, prolong the time of staying of material in dry run, in the other direction the setting in big inclined hole district, inclination angle then is to make material be the suspension fluidization, makes the material internal structure water can be fast to the thing surface migration, to guarantee under the work condition state of low-temperature heat, reach high-intensity closed cycle liquefaction drying effect.
The dedusting filter 1-2 of described fluid bed dryer 1 is a vapour-pressure type filter bag dedusting filter, comprises cylinder 1-2-1, filter bag frame 1-2-2, filter bag 1-2-3 and is fixed on card 1-2-4 on the cabinet wall.Described cylinder 1-2-1 is 4, sealing and fixing is at the casing top, the pull bar 1-2-11 of cylinder 1-2-1 stretches in the casing and is connected with described filter bag frame 1-2-2, filter bag frame 1-2-2 goes up sealing and fixing 24 unlimited filter bag 1-2-3 suitable for reading, card 1-2-4 goes up corresponding each filter bag and is provided with locating hole 1-2-41, and the end opening of filter bag 1-2-3 is enclosed within on the protruding circle 1-2-5 of locating hole aperture.Drive the shake of filter bag frame by cylinder, drive the filter bag shake by the filter bag frame particulate dust that gathers on filter bag surface is removed.
See Fig. 9 to Figure 15, described condensing unit 2 comprises housing 2-5, housing 2-5 two ends are respectively equipped with air inlet 2-5-1 and gas outlet 2-5-2, be provided with filtration members 2-1, condenser 2-2 and retaining liquid assembly 2-3 successively to the gas outlet from air inlet in the housing 2-5, below condenser 2-2 and retaining liquid assembly 2-3, be provided with collecting tank 2-4, lower housing portion is provided with cooling water water inlet manifold 2-5-3, housing top is provided with cooling water outfall sewer 2-5-4, and the bottom of collecting tank 2-4 is provided with the solvent collection pipe 2-6 that leads to hull outside.Also be provided with access door 2-7 on the housing.Described filtration members 2-1 can buy from market, and filtration members 2-1 filters the thermal current that is entrained with particulate dust, avoids assembling obstruction condensing gas stream passage because of the accumulation of powder material.Described condenser 2-2 has cooling fin 2-2-1 and the some snakelike coolant pipe 2-2-2 that be arranged in parallel, be distributed with the cooling fluid pore on the cooling fin 2-2-1, the straight-tube portion of every coolant pipe 2-2-2 is by the cooling fluid hole of all cooling fin correspondence positions, and the two ends of every snakelike coolant pipe are connected with cooling fluid fluid house steward 2-5-4 with cooling fluid feed liquor house steward 2-5-3 respectively.This condenser adopts the cooling tube of large-area cooling fin and minor diameter, has increased the heat transfer sheet area greatly.Described retaining liquid assembly 2-3 for forming to the stream waveform retaining liquid unit 2-3-1 that connects into before and after the upright single-piece 2-3-11 of " going into " font, forms stream undulating path Q by several cross sections between the retaining liquid unit 2-3-1.The two ends 2-3-110 of the front portion of described upright single-piece 2-3-11 curves inwardly, and described upright single-piece 2-3-11 forms (seeing Figure 14) by the concave-convex Sheet Metal Processing, forms spout on its surface.The moulding of above-mentioned retaining liquid unit and retaining liquid assembly labyrinth shape structure enlarge gasifying gas heat exchange area of dissipation, have good dew and drip and compile effect.Damp and hot nitrogen enters from air inlet 2-5-1, and part 2-1 filters after filtration, passes through the slit between the cooling fin 2-2-1 of condenser 2-2, finishes through retaining liquid assembly 2-3 and reveals compiling of dripping.
See Figure 16 to Figure 17, described material envelope type screw feeder 7 has housing 7-1, motor decelerating mechanism 7-3, be provided with in the housing by motor decelerating mechanism 7-3 and drive main shaft 7-2, the end end face that housing 7-1 goes up nearly motor decelerating mechanism is provided with loading hopper 7-4, be provided with guard grating 7-7 and anti-bridge formation device 7-8 in the loading hopper 7-4, housing other end bottom surface is provided with discharging opening 7-6.The setting of guard grating 7-7 prevents that big thing from entering loading hopper, and the pushing that can eliminate loading hopper 7-4 internal cause wet stock that is provided with of anti-bridge formation device 7-8 forms false crane span structure or the false phenomenon of reuniting and luming, and plays the effect that material enters feeder 7 that promotes.The axle of anti-bridge formation device 7-8 passes through chain transmission 7-9 driven rotary by described motor decelerating mechanism 7-3.The leading portion of main shaft is spiro rod section 7-2-1, and it is reduction stage 7-2-2 that the back segment of main shaft is provided with broken blade 7-2-21, and the spiro rod section 7-2-1 here should be the major part that accounts for main shaft.The setting of broken blade be since wet stock in reinforced process, the promotion extruding through screw rod can be squeezed into the filter cake bulk of distinct program, so need in addition broken or pulverize, otherwise can directly influence the drying effect of material.The spiro rod section 7-2-1 of the top of housing 7-1 and corresponding main shaft 7-2 and the intersection of reduction stage 7-2-2 are provided with opening, opening part is equipped with cover 7-5, form protuberance, thereby in housing, form material envelope space k, in use, utilize material to be deposited in naturally in the material envelope space k, stop because of nitrogen and leak or extraneous air enters system and influences intrasystem pressure stability.When the material in the material envelope space k is broken with the rotation along with broken blade, flow to discharging opening 7-6 in an orderly manner, through the discharging opening blanking.
Be provided with nitrogen storage jar 16 in the present embodiment, the nitrogen of being sent here by nitrogen making machine enters nitrogen storage jar 16.In use, open nitrogen for the valve 12 on the pipe 8, close Hand-operated butterfly valve 13 simultaneously, open manual atmospheric valve 14, the air in the exchange system, nitrogen heats through circulating fan 4 to nitrogen heater 5, nitrogen after the heating enters drying machine 1, after being full of nitrogen in the system, manually atmospheric valve 14 cuts out, and opens Hand-operated butterfly valve 13.Material enters in the fluid bed dryer 1 by material envelope type screw feeder 7, moves in fluidized-bed layer, and dried finished products is collected by the discharge valve 1-5 of fluid bed dryer 1.The damp and hot nitrogen of carrying the micro mist material secretly enters condensing unit 2, organic solvent in the damp and hot nitrogen is carried out condensation to be reclaimed, the organic solvent that reclaims is discharged from the liquid outlet of condensing unit 2 bottoms and is stored in the solvent recovery jar 6, wet nitrogen is by behind the solid and gas separator 3, removed the residue organic solvent in the nitrogen effectively, under the relay air inducing effect of circulating fan 4, reenter nitrogen heater 5 heating and enter drying machine 1, form circulation.The micro mist material that separates through solid and gas separator 3 is captured by the bottom discharge mouth of solid and gas separator.
Native system is provided with temperature, pressure, level sensor and online oxygen analyser, and the oxygen residual quantity in the control system is guaranteed production safety, can pass through the PLC programme-control, realizes automation mechanized operation.When system pressure was higher than setting pressure, Pneumatic butterfly valve 15 was opened pressure release automatically, reduced pressure; When system pressure was lower than setting pressure, nitrogen was opened automatically for the valve 12 on the pipe 10, and system charges into nitrogen, rising pressure.Like this, both guarantee the stability of system pressure, also guaranteed the renewal of circulating nitrogen gas.
Claims (9)
1. nitrogen closed cycle drying and solvent recovering system have drying machine, condensing unit (2), solid and gas separator (3), circulating fan (4), nitrogen heater (5), solvent recovery jar (6) and nitrogen for pipe (8); It is characterized in that: described drying machine is fluid bed dryer (1), the exhaust outlet of fluid bed dryer (1) is connected by the air inlet of pipeline with described condensing unit (2), the air outlet of condensing unit (2) is connected with described solid and gas separator (3) by pipeline, the air outlet of solid and gas separator (3) is connected with described circulating fan (4) by circulating line (11), the wind of circulating fan (4) output is delivered to described nitrogen heater (5) heating, and the nitrogen after the heating is delivered in the drying machine (1); Described nitrogen is connected with circulating line (11) for pipe (8); The solvent collection mouth of described condensing unit (2) is connected by the inlet of pipeline with solvent recovery jar (6), and described condensing unit (2) and solvent recovery jar (6) provide cooling medium by cooling fluid for pipe (9); The charging aperture of described fluid bed dryer (1) is equipped with material envelope type screw feeder (7); Described condensing unit (2) comprises housing (2-5), housing (2-5) two ends are respectively equipped with air inlet (2-5-1) and gas outlet (2-5-2), be provided with filtration members (2-1) successively to the gas outlet from air inlet in the housing (2-5), condenser (2-2) and retaining liquid assembly (2-3), below at condenser (2-2) and retaining liquid assembly (2-3) is provided with collecting tank (2-4), lower housing portion is provided with cooling fluid feed liquor house steward (2-5-3), housing top is provided with cooling fluid fluid house steward (2-5-4), and the bottom of collecting tank (2-4) is provided with the solvent collection pipe (2-6) that leads to hull outside; Described condenser (2-2) has cooling fin (2-2-1) and the numerous snakelike coolant pipe (2-2-2) that be arranged in parallel, be distributed with the cooling fluid pore on the cooling fin (2-2-1), the straight-tube portion of every coolant pipe is by the cooling fluid pore of all cooling fin correspondence positions, and the two ends of every snakelike coolant pipe (2-2-2) are connected with cooling fluid fluid house steward (2-5-4) with cooling fluid feed liquor house steward (2-5-3) respectively; Described retaining liquid assembly (2-3) for forming to the stream waveform retaining liquid unit (2-3-1) that connects into before and after the upright single-piece (2-3-11) of " going into " font, forms stream undulating path (Q) by several cross sections between the retaining liquid unit (2-3-1).
2. nitrogen closed cycle drying according to claim 1 and solvent recovering system, it is characterized in that: described fluid bed dryer (1) comprises the airflow-distribution board (1-1) that is in middle part in the casing, be in the air-flow distribution air ducting (1-3) of bottom and be in the dedusting filter (1-2) on top, be respectively equipped with feed hopper (1-4) and discharging opening on the casing position of corresponding fluidized-bed layer upper and lower part, discharge valve (1-5) is installed on the discharging opening; Described airflow-distribution board (1-1) is that the hole is to different airflow-distribution boards, airflow-distribution board (1-1) is divided into by inclined hole district and straight hole interval every several porose areas that are provided with by feed end to discharge end, the porose area at the two ends of airflow-distribution board (1-1) is the inclined hole district and is the inclined hole district, little inclination angle (c) of incline direction unanimity, remaining inclined hole district is inclined hole district, big inclination angle (b), and the inclined hole incline direction that is in the inclined hole district, big inclination angle (b) of both sides, same straight hole district (a) is opposite.
3. nitrogen closed cycle drying according to claim 2 and solvent recovering system, it is characterized in that: all between 1.5 millimeters to 2.5 millimeters, the percent opening of whole airflow-distribution board is 4% to 6% for the inclined hole aperture in the straight hole aperture in described straight hole district (a), big inclined hole district, inclination angle (b) and the inclined hole aperture in inclined hole district, little inclination angle (c).
4. nitrogen closed cycle drying according to claim 2 and solvent recovering system is characterized in that: the area in described straight hole district (a), inclined hole district, little inclination angle (c) is identical, and big inclined hole district, inclination angle (b) area is 50% of straight hole district (a) area.
5. according to described nitrogen closed cycle drying of one of claim 2 to 4 and solvent recovering system, it is characterized in that: the size at the inclined hole inclination angle (α) in described inclined hole district, big inclination angle (b) is between 60 to 80 degree, and the size at the inclined hole inclination angle (β) in inclined hole district, little inclination angle (c) is between 40 to 50 degree.
6. nitrogen closed cycle drying according to claim 2 and solvent recovering system, it is characterized in that: the dedusting filter (1-2) of described fluid bed dryer (1) is a vapour-pressure type filter bag dedusting filter, comprise cylinder (1-2-1), filter bag frame (1-2-2), filter bag (1-2-3) and be fixed on card (1-2-4) on the cabinet wall, described cylinder (1-2-1) sealing and fixing is at the casing top, the pull bar (1-2-11) of cylinder (1-2-1) stretches in the casing and is connected with described filter bag frame (1-2-2), filter bag frame (1-2-2) is gone up sealing and fixing some unlimited filter bags suitable for reading (1-2-3), card (1-2-4) is gone up corresponding each filter bag and is provided with locating hole (1-2-41), and the end opening of filter bag (1-2-3) is enclosed within on the locating hole aperture.
7. nitrogen closed cycle drying according to claim 2 and solvent recovering system, it is characterized in that: the position of the corresponding fluidized-bed layer of the casing of described fluid bed dryer (1) is provided with actuating doors (1-7), and actuating doors (1-7) is provided with automatically cleaning visor (1-6).
8. nitrogen closed cycle drying according to claim 1 and solvent recovering system is characterized in that: the two ends (2-3-110) of the front portion of the upright single-piece (2-3-11) of described condensing unit (2) curve inwardly; Described upright single-piece (2-3-11) is formed by the concave-convex Sheet Metal Processing.
9. nitrogen closed cycle drying according to claim 1 and solvent recovering system, it is characterized in that: described material envelope type screw feeder (7) has housing (7-1), motor decelerating mechanism (7-3), be provided with the main shaft (7-2) that drives by motor decelerating mechanism (7-3) in the housing, the front end end face of housing (7-1) is provided with loading hopper (7-4), be provided with guard grating (7-7) and anti-bridge formation device (7-8) in the loading hopper (7-4), bottom surface, housing rear end is provided with discharging opening (7-6), the leading portion of main shaft is spiro rod section (7-2-1), it is reduction stage (7-2-2) that the back segment of main shaft is provided with broken blade (7-2-21), the spiro rod section of the top of housing (7-1) and corresponding main shaft (7-2) and the intersection of the reduction stage formation protuberance that raises up, thus material envelope space (k) in housing, formed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010103008929A CN101776372B (en) | 2010-01-28 | 2010-01-28 | Nitrogen closed cycle drying and solvent recovery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010103008929A CN101776372B (en) | 2010-01-28 | 2010-01-28 | Nitrogen closed cycle drying and solvent recovery system |
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| CN101776372A CN101776372A (en) | 2010-07-14 |
| CN101776372B true CN101776372B (en) | 2011-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201653074U (en) * | 2010-01-28 | 2010-11-24 | 常州市星干干燥设备有限公司 | Closed-loop circulating drying unit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201653074U (en) * | 2010-01-28 | 2010-11-24 | 常州市星干干燥设备有限公司 | Closed-loop circulating drying unit |
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