CN103386204A - Heat pump evaporating and heat pump drying energy saving technology for production of polyaluminium chloride - Google Patents
Heat pump evaporating and heat pump drying energy saving technology for production of polyaluminium chloride Download PDFInfo
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- CN103386204A CN103386204A CN2013103504570A CN201310350457A CN103386204A CN 103386204 A CN103386204 A CN 103386204A CN 2013103504570 A CN2013103504570 A CN 2013103504570A CN 201310350457 A CN201310350457 A CN 201310350457A CN 103386204 A CN103386204 A CN 103386204A
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention relates to heat pump evaporating and heat pump drying energy saving technology for production of polyaluminium chloride, wherein the concentration of material slurry after reaction is controlled to be in the low concentration of 7%-10%, heat pump drying is carried out after heat pump evaporation and concentration, and the concentration for heat pump evaporation concentration is controlled to be below 15%. Secondary steam generated by evaporation concentration and secondary steam generated by drying are respectively used as the heating steam of evaporation and drying after being raised to the temperature of 117-123 DEG C and 135-145 DEG C by boosting due to primary compression and secondary compression of the heat pump (steam compressor), thereby replacing conventional boiler steam. Drying barrels are all arranged in a closed heat insulation drying room, and the pressure in the drying room is higher than the pressure outdoors by 50-100Pa all the time in production. Compared with conventional drying adopting steam barrels, the new technology can reduce the energy consumption by about 70%.
Description
Technical field
The present invention relates to the thermo-compression evaporation heat pump drying power-saving technology that polymeric aluminum is produced, the power-saving technology and the equipment that relate to the Steam Heating drying drum of slip, be applicable to slip directly in the cylinder surface of Boiler Steam heating dry and reducing energy consumption and the upgrading of the industry-by-industry that the dry indirect steam that produces all discharges.
Background technology
The traditional handicraft that aluminium polychloride is produced, be that the cylinder surface that reacted slip is directly delivered to the Boiler Steam heating is carried out drying, and the dry indirect steam that produces all is discharged into atmosphere.Therefore, the energy consumption of slip drying is very high.The steam consumption of product per ton is up to the heating steam of 2.1-2.3 ton.Drying drum adopts the thermal source of boiler high temperature steam as dry heat, and the dry intermediate water steam that produces all directly is discharged into atmosphere, the a large amount of indirect steam thermal source of serious waste not only, and surrounding environment is caused serious thermal pollution and Acid Rain Pollution (because the dry water vapour that produces is acid, pH value 4.5 left and right).
Cylinder and scraper all adopt the carbon steel manufacturing.Because the aluminium polychloride feed liquid is acid large, pH value only has 1.5, and is chlorion, and corrosivity is very strong under the high temperature of 165 ℃, and service life is very short.The drying drum life-span of 20mm thick carbon steel plate manufacturing only had 4 months-10 months, with regard to integral body, scrapped; The scraper blade life that the 2mm thick carbon steel plate is made is shorter, only has the two weeks left and right, and due to can not auto-compensation after blade wears, the assembling station also will be changed once in centre.Therefore, the workload of operation maintenance and frequent replacing dismounting is very large.
Summary of the invention
The present invention does not utilize the too high root problem of energy consumption of indirect steam mainly for existing Rotary drying cylinder, solve simultaneously the too low and too large major issue of operation maintenance workload of life-span of carbon steel cylinder and carbon steel scraper, the thermo-compression evaporation heat pump drying power-saving technology that the polymeric aluminum that proposes is produced, can save 70% left and right than expending of existing Boiler Steam cylinder convection drying, than extending more than ten times the service life of present carbon steel cylinder and carbon steel scraper, and can also auto-compensation after blade wears, operating maintenance workload convergence is zero.
Technical scheme of the present invention is: the thermo-compression evaporation heat pump drying power-saving technology that polymeric aluminum is produced, new technology is: reacted raw material pulp density is controlled at the cubage of 7%-10%(by the active ingredient aluminium oxide) low concentration, enable to expend with the integrated cost of the calcium powder expense of as reaction raw materials, adding minimum; Feed liquid is first carried out the drying drum drying again after evaporimeter is concentrated.Due to the evaporation of identical dehydrating amount more than roller drying economy, and the collection that recycles of indirect steam and the aspect of sneaking into of avoiding incoagulable gas, evaporimeter is all than drying drum easy too much all, installation cost and factory building expense are much lower especially.Therefore, the pulp density parameter after thermo-compression evaporation is concentrated is controlled high as far as possible, in order to reduce dry dehydrating amount; But the requirement that must can meet evaporation and concentration take the mobility of slip is as limit, and the exit concentration of evaporimeter is controlled in 15% the scope of being no more than.
Drying drum all is arranged in the hothouse of sealed thermal insulating, in order to all collect, utilizes the dry indirect steam that produces to recycle.Compare with the indirect steam collecting hood of each drying drum independent design, hothouse can reduce heat loss greatly, saves again a large amount of installation costs.The dry indirect steam that produces of evaporation and concentration and slip, after all supercharging is warmed up to 117-123 ℃ through one-level heat pump (steam compression machine), a part enters evaporator heating chamber, and another part enters secondary heat pump (steam compression machine) supercharging and enters drying drum after being warmed up to 135-145 ℃; Recycle like this indirect steam, replace traditional boiler heating steam source, can reduce energy consumption cost 70% left and right.In order to meet the high efficiency requirement of steam-condensation heating, the high-temperature steam of heat pump outlet must be all saturated vapor, therefore the heat pump import department of one-level compression adopts from the evaporator condensation water spray, and the heat pump import department of two-stage compression adopts the condensed water spraying from drying drum.The benefit of spraying, both can reduce the compression power consumption of heat pump like this, do not need again the force (forcing) pump of spraying.The overall heat-transfer coefficient of the heat-insulation layer of the body of wall of hothouse, ground, roof and thermal insulating door thermally insulated door requires at 0.15(w/m
2.s) below.The seal measure of hothouse is to be controlled at slight positive pressure state,, than outdoor high 50-100Pa, stops bleeding of air all the time, avoids incoagulable gas to cause the steam-condensation efficiency of heating surface to worsen the generation of phenomenon, guarantees for a long time, efficiently moves continuously.Finished product bin is located at below ground, utilizes the interior dry finished product of feed bin to be formed with the material envelope of effect, cuts off the passage between hothouse and outdoor air.The operation conditions of hothouse, mainly realize monitoring by the image of camera unofficial biography; Secondly directly observe by transparent observation window.When the equipment in hothouse needs light maintenance, can enter by AD.The outside of observation window and AD also is hung with the heat-preservation cotton curtain, improves heat insulating ability, and when minimizing is opened the door, steam leaks outside.
The condensed water of drying drum first passes through flash tank, after temperature is reduced to condensed water uniform temp with evaporimeter, deliver to preheater heating raw liquid again together with the condensed water of evaporimeter, improve raw material enter evaporimeter inlet temperature, both the energy consumption of evaporimeter can be reduced, and the production capacity of evaporimeter can be improved again.Because the needs of polymeric aluminum production technology have added calcium powder, calcium content in feed liquid is more than 30 times of plain cylindrical furnace water, the tube still heater of evaporimeter and preheater all easy fouling lowers efficiency, even stops up, therefore, gear leaf screw cleaning machine and cycle screw cleaning machine that evaporimeter and preheater adopt respectively on-line continuous automatically to clean, prevent from heating in-tube fouling, keep the long-term high efficiency of operation continuously.
Enter the sealed thermal insulating hothouse for fear of the incoagulability air, must reduce as far as possible the door opening times of maintenance.For this reason, drying drum adopts corrosion resistant titanium plate or titanium clad steel plate to make, and scraper adopts the polytetrafluoroethylplastic plastic manufacturing, makes the life-span of drying drum and scraper, extends more than ten times than the carbon steel cylinder of conventional art and carbon steel scraper respectively.And after the plastics blade wears, can automatically move down compensation under the pressure-acting of lift heavy.Cloth tube and foamed silica gel gear liquid roller are arranged on the side top of roller tube, and gear liquid roller is as much as possible near scraper one side.The cloth bore dia 3-8mm of cloth tube, the pitch-row 15-60mm of axial uniform arrangement.Cloth cloth fixedly is laid on the wood pallet of inclination, and sagging cloth cloth contacts just with cylinder surface.The slip that gets off in the cloth hole of cloth tube, first be distributed to cylinder surface again through the good cloth cloth of wettability, can improve uniform property.Under the tightening force effect of spring, gear liquid roller can be pressed on the drum surface of drying drum all the time with suitable thrust, and the continuation of thoroughly blocking slip is dirty, can also form little hydrops boiling pool before gear liquid roller, further improve slip along drum shaft to uniform degree.The tightening force size of spring, by every meter 50-200N design of gear liquid roller, foaming degree and the thickness of big or small value Main Basis silica gel; And after the wearing and tearing of gear liquid roller, the amplitude that the tightening force of spring lowers is controlled in 20%.
During production run, the slip of 7%-10% is first through the preheater of condensed water heating, enters evaporimeter after improving temperature, evaporation and concentration to concentration be controlled at below 15%, then deliver to hothouse, slip carries out drying through the drum surface that cloth tube is added to drying drum.Dry finished product is scraped by scraper, via belt conveyor, delivers to underground feed bin, then through the closed conveying worm, sends to the ground packing.Drying drum drives rotation by the variable-frequency motor reductor by chain drive.Secondary heat pump high-temperature steam out enters in cylinder and heats, the condensed water force feed out after, first go flash tank step-down flash distillation, then remove preheater heating raw liquid.Air special use when roof ventilator is driving in the pump drainage hothouse.
Description of drawings
The conceptual scheme of the thermo-compression evaporation heat pump drying power-saving technology that Fig. 1 polymeric aluminum is produced;
The 1 secondary heat pump 2 spraying 3 one-level heat pump 4 flash tank 5 circulating pump 6 evaporimeter kerve 7 evaporimeter 8 gear leaf screw cleaning machine 9 cycle screw cleaning machine 10 preheater 11 heat-insulation layer 12 hothouse 13 cloth tube 14 roof ventilator 15 wood pallet 16 cloth cloth 17 gear liquid roller 18 camera 19 frame 20 observation window 21 lift heavy 22 scraper 23 spring 24 cotton curtain 26 conveying worm 27 feed bin 28 belt conveyor 29 drying drum 30 chain drive 31 variable-frequency motor reductors of AD 25 in figure.
The specific embodiment
Specific embodiments below in conjunction with accompanying drawing 1 explanation patent of the present invention:
The thermo-compression evaporation heat pump drying power-saving technology that polymeric aluminum is produced, new technology is: reacted raw material pulp density is controlled at the low concentration of 7%-10%, enables to expend the integrated cost that takes with the calcium powder that adds as reaction raw materials minimum; Feed liquid is first carried out drying drum 29 dryings again after evaporimeter 7 is concentrated.The evaporation of identical dehydrating amount is more than dry economical and convenient, and the collection that recycles of indirect steam and the aspect of sneaking into of avoiding incoagulable gas, and evaporimeter 7 is also all much easier than drying drum 29, and installation cost and factory building expense are much lower especially.Therefore, the pulp density parameter after evaporimeter 7 is concentrated is controlled high as far as possible, in order to reduce the dehydrating amount of drying drum 29 subsequently; But the requirement that must can meet evaporation and concentration take the mobility of slip is as limit, the exit concentration of evaporimeter 7 is controlled in 15% the scope of being no more than for this reason.
Drying drum 29 all is arranged in hothouse 12, in order to all collect, utilizes the dry indirect steam that produces to recycle.Compare with the indirect steam collecting hood of each drying drum 29 independent design, hothouse 12 can reduce heat loss greatly, saves again a large amount of installation costs.The dry indirect steam that produces of evaporation and concentration and slip, after all 3 superchargings were warmed up to 117 ℃-123 ℃ through the one-level heat pump, a part entered evaporimeter 7 heating clambers, and another part enters after 1 supercharging of secondary heat pump is warmed up to 135 ℃-145 ℃ and enters drying drum 29; Recycle like this indirect steam, replace traditional boiler heating steam source, can reduce energy consumption cost 70% left and right.In order to meet the high efficiency requirement of steam-condensation heating, the high-temperature steam of heat pump outlet must be all saturated vapor, therefore one-level heat pump 3 import departments adopt flash-pot 7 condensed water sprayings 2, and secondary heat pump 1 import department adopts the condensed water spraying 2 from drying drum 29.The largest benefit of this spraying 2, be to reduce the compression power consumption of heat pump, is secondly the force (forcing) pump that does not need condensed water spraying 2.The overall heat-transfer coefficient of the heat-insulation layer 11 of the body of wall of hothouse 12, ground, roof and thermal insulating door thermally insulated door requires 0.15(w/m
2.s) below.The key measure of the seal of hothouse 12, to be controlled at slight positive pressure state in whole hothouse 12, all the time than outdoor high 50--100Pa, stopping air with this bleeds, avoid incoagulable gas to cause the deterioration phenomenon of the steam-condensation efficiency of heating surface to occur, guarantee heat drying cylinder 29 can be for a long time, efficiently operation continuously.Finished product bin 27 is located at below ground,, in order to utilize feed bin 27 interior dry finished products to be formed with the material envelope of effect, cuts off the passage between hothouse 12 and outdoor air.The operation conditions of hothouse 12, mainly realize monitoring by the image of camera 18 unofficial biography; Secondly directly observe by transparent observation window 20.When the equipment in hothouse 12 needs light maintenance, can enter by AD 24.The outside of observation window 20 and AD 24 also is hung with heat-preservation cotton curtain 25, improves heat insulating ability, and when minimizing is opened the door, steam leaks outside.
Drying drum 29 condensed water out first passes through flash tank 4, temperature be reduced to evaporimeter 7 condensed water uniform temp out after, deliver to preheater 10 heating raw liquid again together with the condensed water of evaporimeter 7, improve raw material enter evaporimeter 7 inlet temperature, both the energy consumption of evaporimeter can be reduced, and the production capacity of evaporimeter can be improved again.Because the needs of polymeric aluminum production technology have added calcium powder, calcium content in feed liquid is more than 30 times of plain cylindrical furnace water, the tube still heater of evaporimeter 7 and preheater 10 all easy fouling lowers efficiency, even stops up, therefore, gear leaf screw cleaning machine 8 and cycle screw cleaning machine 9 that evaporimeter 7 and preheater 10 adopt respectively on-line continuous automatically to clean, prevent from heating in-tube fouling, keep the long-term high efficiency of operation continuously.
Enter the hothouse 12 of sealed thermal insulating for fear of the incoagulability air, must reduce as far as possible the door opening times of maintenance.For this reason, drying drum 29 adopts corrosion resistant titanium plate or titanium clad steel plate to make, scraper 22 adopts the polytetrafluoroethylplastic plastic manufacturing, makes the life-span of drying drum 29 and scraper 22, extends more than ten times than the carbon steel drying drum 29 of conventional art and carbon steel scraper 22 respectively.And after the plastics blade wears, can automatically move down compensation under the pressure-acting of lift heavy 21.Cloth tube 13 and gear liquid roller 17 are arranged on the side top of drying drum 29 cylindrical shells, and gear liquid roller 17 is as much as possible near scraper 22 1 sides.The cloth bore dia 3-8mm of cloth tube 13, the pitch-row 15-60mm of axial uniform arrangement.Cloth cloth 16 fixedly is laid on the wood pallet 15 of inclination, and sagging cloth cloth 16 contacts just with drying drum 29 surfaces.The slip that gets off in the cloth hole of cloth tube 13, first be distributed to drying drum 29 surfaces again through the good cloth cloth 16 of wettability, can improve uniform property.Under the tightening force effect of spring 23, gear liquid roller 17 can be pressed on the drum surface of drying drum 29 all the time with suitable thrust, and the continuation of thoroughly blocking slip is dirty, can also, in gear liquid roller 17 front formation hydrops boiling pool, further improve the uniform degree of slip of drying drum 29.The tightening force size of spring 23, design foaming degree and the thickness of big or small value Main Basis silica gel with every meter 50-200N by the thrust of keeping off 17 pairs of drying drums 29 of liquid roller; And after 17 wearing and tearing of gear liquid roller, the amplitude that the tightening force of spring 23 lowers is controlled in 20%.
During production run, the slip of 7%-10% is first through the preheater 10 of condensed water heating, enters evaporimeter 7 after improving temperature, evaporation and concentration to concentration be controlled at below 15%, then deliver to hothouse 12, slip carries out drying through the drum surface that cloth tube 13 is added to drying drum 29.Dry finished product is scraped by scraper 22, via belt conveyor 28, delivers to underground feed bin 27, then through closed conveying worm 26, sends to the ground packing.Drying drum 29 by variable-frequency motor reductor 31 by chain drive 30 driven rotary.Secondary heat pump 1 high-temperature steam out, enter heating by the annular channel between drying drum 29 hollow shafts and inner tube, and condensed water through the inner tube force feed out, first goes flash tank 4 step-down flash distillations, then removes preheater 10 heating raw liquid.Air special use when roof ventilator 14 is driving in pump drainage hothouse 12.
Claims (6)
1. the polymeric aluminum thermo-compression evaporation heat pump drying power-saving technology of producing, it is characterized in that: reacted raw material pulp density is controlled at the low concentration of 7%-10%; First carry out drying drum (29) drying after evaporimeter (7) is concentrated, the concentrated concentration of evaporimeter (7) is controlled at below 15% again; Evaporation and concentration and the dry indirect steam that produces, after all supercharging is warmed up to 117-123 ℃ through one-level heat pump (3) (steam compression machine), a part enters evaporimeter (7) heating clamber, and another part enters after secondary heat pump (1) (steam compression machine) supercharging is warmed up to 135-145 ℃ and enters drying drum (29); Drying drum (29) all is arranged in the hothouse (12) of sealed thermal insulating, and the pressure in hothouse during production (12) is all the time than outdoor high 50-100Pa.
2. the polymeric aluminum according to claim 1 thermo-compression evaporation heat pump drying power-saving technology of producing, it is characterized in that the gear liquid roller (17) that cloth tube (13) and foamed silica gel are made is arranged on the side top of drying (29) roller tube, and keep off liquid roller (17) near scraper (22) one sides; Under the tightening force effect of spring (23), gear liquid roller (17) can, all the time with suitable thrust, be pressed on the drum surface of drying drum (29); The tightening force size of spring (23), gear liquid roller (17) designs by every meter 50-200N the thrust size of drying drum (29), and after gear liquid roller (17) wearing and tearing, the amplitude that the tightening force of spring (23) lowers is controlled in 20%; The cloth bore dia 3-8mm of cloth tube (13), the pitch-row 15-60mm of axial uniform arrangement.
3. the polymeric aluminum according to claim 1 thermo-compression evaporation heat pump drying power-saving technology of producing, it is characterized in that: drying drum (12) adopts corrosion resistant titanium plate or titanium clad steel plate to make, scraper (22) adopts the polytetrafluoroethylplastic plastic manufacturing, can move down auto-compensation in lift heavy (21) applied pressure effect after scraper (22) wearing and tearing.
4. the polymeric aluminum according to claim 1 thermo-compression evaporation heat pump drying power-saving technology of producing, it is characterized in that: the condensed water of drying drum (29) first passes through flash tank (4), after temperature is reduced to condensed water uniform temp with evaporimeter (7), then deliver to preheater (10) heating raw together with the condensed water of evaporimeter (7).
5. the thermo-compression evaporation heat pump drying power-saving technology of polymeric aluminum production according to claim 1, is characterized in that: gear leaf screw cleaning machine (8) and cycle screw cleaning machine (9) that evaporimeter (7) and preheater (10) adopt respectively on-line continuous automatically to clean.
6. the polymeric aluminum according to claim 1 thermo-compression evaporation heat pump drying power-saving technology of producing, it is characterized in that: one-level heat pump (3) import department adopts the spraying (2) of flash-pot (7) condensed water, secondary heat pump (1) import department adopts the spraying (2) from the condensed water of drying drum (29), and the condensed water spray amount reaches capacity steam as degree take the steam of heat pump outlet.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103708516A (en) * | 2013-12-23 | 2014-04-09 | 长沙理工大学 | Efficient energy-saving spray drying and automatic packaging method for producing powdery polyaluminum chloride |
| CN107899259A (en) * | 2017-12-20 | 2018-04-13 | 中国科学院理化技术研究所 | A kind of Analysis of Heat Pump Drying System and its operating method available for solution concentration |
| WO2018126651A1 (en) * | 2017-01-05 | 2018-07-12 | 广州市心德实业有限公司 | Evaporation, crystallization and drying integrated device and evaporation crystallization drying method |
| CN116753717A (en) * | 2023-08-17 | 2023-09-15 | 常州江河干燥设备有限公司 | Intelligent raw material conveying equipment, drying system and method using equipment |
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| JPS5622629A (en) * | 1979-07-17 | 1981-03-03 | Degussa | Aluminum trichloride evaporation device |
| CN1544348A (en) * | 2003-11-19 | 2004-11-10 | �Ϻ���ͨ��ѧ | Polymeric aluminum chloride flocculant preparation method using phthalocyanine green waste water |
| WO2009141234A1 (en) * | 2008-05-19 | 2009-11-26 | Evonik Degussa Gmbh | Process for the phase transformation of substances |
| CN102961882A (en) * | 2012-12-12 | 2013-03-13 | 李锦龙 | Mixed type steam mechanical recompression evaporator |
| CN202921003U (en) * | 2012-11-13 | 2013-05-08 | 苏州凯新分离科技有限公司 | Heat-pump type vacuum evaporation and concentration system |
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Patent Citations (5)
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|---|---|---|---|---|
| JPS5622629A (en) * | 1979-07-17 | 1981-03-03 | Degussa | Aluminum trichloride evaporation device |
| CN1544348A (en) * | 2003-11-19 | 2004-11-10 | �Ϻ���ͨ��ѧ | Polymeric aluminum chloride flocculant preparation method using phthalocyanine green waste water |
| WO2009141234A1 (en) * | 2008-05-19 | 2009-11-26 | Evonik Degussa Gmbh | Process for the phase transformation of substances |
| CN202921003U (en) * | 2012-11-13 | 2013-05-08 | 苏州凯新分离科技有限公司 | Heat-pump type vacuum evaporation and concentration system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103708516A (en) * | 2013-12-23 | 2014-04-09 | 长沙理工大学 | Efficient energy-saving spray drying and automatic packaging method for producing powdery polyaluminum chloride |
| WO2018126651A1 (en) * | 2017-01-05 | 2018-07-12 | 广州市心德实业有限公司 | Evaporation, crystallization and drying integrated device and evaporation crystallization drying method |
| CN107899259A (en) * | 2017-12-20 | 2018-04-13 | 中国科学院理化技术研究所 | A kind of Analysis of Heat Pump Drying System and its operating method available for solution concentration |
| CN107899259B (en) * | 2017-12-20 | 2020-07-10 | 中国科学院理化技术研究所 | Heat pump drying system for solution concentration and operation method thereof |
| CN116753717A (en) * | 2023-08-17 | 2023-09-15 | 常州江河干燥设备有限公司 | Intelligent raw material conveying equipment, drying system and method using equipment |
| CN116753717B (en) * | 2023-08-17 | 2023-10-20 | 常州江河干燥设备有限公司 | Drying system and drying method |
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Application publication date: 20131113 |