CN102818445B - Absorptive type clean drying system and method using lithium bromide - Google Patents
Absorptive type clean drying system and method using lithium bromide Download PDFInfo
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- CN102818445B CN102818445B CN201210325615.2A CN201210325615A CN102818445B CN 102818445 B CN102818445 B CN 102818445B CN 201210325615 A CN201210325615 A CN 201210325615A CN 102818445 B CN102818445 B CN 102818445B
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Abstract
The invention discloses an absorptive type clean drying system and method using lithium bromide, belonging to the technical field of energy saving and drying, and having the characteristics of saving energy, and drying cleanly. The absorptive type clean drying system using lithium bromide comprises a drying box (1), and further comprises an enclosed cavity body (2), wherein one end of the enclosed cavity body (2) is communicated with a drying air outlet of the drying box (1), and the other end of the enclosed cavity body (2) is communicated with a drying air inlet of the drying box; a sprayer (9), a first preheater (5), a second preheater (6), a circulating fan (8) and a third preheater (7) are sequentially arranged from the drying air outlet of the drying box to the drying air inlet of the drying box inside the enclosed cavity body (2); the enclosed cavity body (2) is located under the sprayer (9), and provided with a lithium bromide dilute solution storage tank (11); and the system further comprises a heat exchanger (10), a first cooling tower (3) and a second cooling tower (4).With the absorptive type clean drying system and method using lithium bromide disclosed by the invention, a high clean degree can be provided for the drying process; and the system has the characteristic that the operating temperature can be controlled strictly, thus the system is rather suitable for a drying occasion that has low temperature and has a high requirement on the scope of temperature.
Description
Technical field
The present invention relates to a kind of absorption lithium bromide clean dried system and method, belong to energy-conservation and dry field.
Background technology
Current common dry materials mainly adopts combustion of fossil fuels to produce hot flue gas or electrically heated mode adds hot-air, utilizes blower fan that hot flue gas or hot-air are sent into material to be dried, accelerates moisture evaporation in material, thereby realizes being dried material.But low-temperature flue gas (or hot-air) used heat that the more difficult direct recycling volume flow of above drying means is huge, adopts directly emptying method conventionally, not only exists a large amount of heat loss.And the open drying process of the many employings of above method, in external environment, unclean composition easily diffuses into, and can have influence on the quality of dried material, is therefore used for drying the comparatively wide in range occasion of cleanliness factor requirement.Require stricter dry materials for cleanliness factor, have the deficiency of material degree of purity control difficulty, be necessary out novel dried process program and method.
Summary of the invention
The object of the invention is to propose a kind of dry run cleanliness factor high, the strict controlled absorption lithium bromide clean dried system and method for baking temperature.
A kind of absorption lithium bromide clean dried system, is characterized in that: this system comprises drying box, also comprises that one end communicates with the outlet of drying box dry gas, the closed cavity that the other end communicates with the import of drying box dry gas; In closed cavity, be exported to the import of drying box dry gas from drying box dry gas spray thrower, the first preheater, the second preheater, circulating fan, the 3rd preheater are installed successively; In above-mentioned closed cavity, be positioned at described spray thrower below and also there is bromize lithium dilute solution storage tank; This system also comprises heat exchanger, the first cooling tower, the second cooling tower; Above-mentioned heat exchanger heat side entrance is connected with driving steam; Heat exchanger heat side outlet is connected with the 3rd preheater hot side entrance, and the 3rd preheater hot side outlet is connected with external environment; Above-mentioned heat exchanger cold side entrance is connected with bromize lithium dilute solution storage tank liquid-phase outlet; Heat exchanger cold side liquid-phase outlet is connected with the first preheater hot side entrance, and the first preheater hot side outlet is connected with the first hot side entrance of cooling tower, and the hot side outlet of the first cooling tower is connected with solution spraying device; Heat exchanger cold side gaseous phase outlet is connected with the second preheater hot side entrance, and the second preheater hot side outlet is connected with the second hot side entrance of cooling tower, and the hot side outlet of the second cooling tower is connected with external environment.
The drying means that utilizes described absorption lithium bromide clean dried system, is characterized in that comprising following process:
Above-mentioned drying box, closed cavity, the first preheater, the second preheater, the 3rd preheater and circulating fan form the dry subsystem of circulating current; Above-mentioned heat exchanger, the 3rd preheater, the second preheater, the second cooling tower, the first preheater, the first cooling tower, spray thrower and lithium-bromide solution storage tank, form lithium-bromide solution dilution and regeneration subsystem; Circulating current dry run: the dry subsystem of circulating current is closed system, needs to pour the recyclegas with wettability power of certain pressure before startup in above-mentioned closed cavity; Circulating current is under the driving of circulating fan, enter drying box by the import of drying box dry gas, after circulating current has absorbed the moisture evaporating in material in drying box, water capacity improves, then discharge and enter bromize lithium concentrated solution spray district from the outlet of drying box dry gas, the bromize lithium concentrated solution of spray thrower ejection fully absorbs the water vapour in circulating current, drop to bromize lithium dilute solution storage tank and becomes weak solution; Circulating current water capacity behind this region reduces, and then, after the first preheater, the second preheater and the 3rd preheater preheating, again enters drying box by dry gas import; Lithium-bromide solution dilution and regenerative process: start steam and become condensate liquid through heat exchanger heat rear flank, then after the 3rd preheater is cooling, enter environment; Weak solution from bromize lithium dilute solution storage tank becomes two-way after heat exchanger cold side is heated by steam, and a road is indirect steam, and another road is bromize lithium concentrated solution; Wherein indirect steam cooling by the second preheater after, then enter environment after the second cooling tower condensation; Bromize lithium concentrated solution is after the first preheater is cooling, cooling through the first cooling tower again, be then sprayed onto spray district by spray thrower, after water vapour in circulating current is absorbed, drop to bromize lithium dilute solution storage tank, and then enter heat exchanger cold side and start next round circulation.
Above-mentioned sealing moisture absorption gas circulation subsystem, needs to adopt the hygroscopicity gas with wettability power as recycle stock, by hygroscopicity gas in closed cavity circulation, carry, transit steam dehumidifies, common as air, N
2deng can be used as circulatory moisture absorption gas.The moisture absorption gas of selecting need to be under hot conditions saturated water capacity higher than the water capacity under cryogenic conditions, thereby in can circulating by closed cavity, the variation of moisture absorption gas temperature realizes material dehumidifying.And water capacity difference under high/low temperature condition is larger, more favourable for dehumidification process.
Above-mentioned sealing moisture absorption gas circulation subsystem is closed cavity circulation, only has that hygroscopicity gas absorbs, carries in closed cavity circulation, transportation and condensed steam dehumidifies, and whole dry materials process does not have other mass exchange with external environment.Thereby can avoid the secondary pollution of unclean composition to dried material in external environment, therefore there is the effect of clean dried, be particularly suitable for the occasion that dried and clean degree is had relatively high expectations.And composition to be dried has the material of environmental pollution impact.
The sealing moisture absorption gas circulation subsystem of above-mentioned absorption lithium bromide drying system is closed circulation, needs to pour the recyclegas with wettability power of certain pressure before startup in above-mentioned closed circulation passage.Therefore operating pressure and circulating flow rate can be controlled, and by controlling operating pressure and the moisture absorption gas circulation amount of this closed cavity circulation, thereby can strictly control dry materials speed.And the operating pressure that can seal moisture absorption gas circulation subsystem by adjusting adjusts the baking temperature of material, guarantee the quality of material.Therefore this system has the advantages that operating temperature can strictly be controlled, the dry occasion that is particularly suitable for low temperature and temperature range is had relatively high expectations.
Compared with having the pure water of uniform pressure and the biphase equilibrium system of air composition, in the biphase equilibrium system of lithium-bromide solution and air composition, airborne steam partial pressure is starkly lower than the former, and reduces along with the raising of lithium-bromide solution concentration.Lithium-bromide solution is a kind of solution with strong wettability power, and along with the raising of solution concentration, the reduction of solution temperature, the wettability power of lithium-bromide solution is stronger.Therefore reduce the temperature of spray thrower outlet bromize lithium concentrated solution and improve the effective way that its concentration is raising system drying efficiency as far as possible.But be subject to the impact of saturation degree, excessively improve lithium-bromide solution concentration and can cause its crystallization, blocking channel, therefore the concentration of this system bromize lithium concentrated solution used need to be subject to the impact of saturation degree.
Accompanying drawing explanation
Fig. 1 is absorption lithium bromide drying system;
Fig. 2 is drying box column gas distribution structure 1;
Fig. 3 is drying box column gas distribution structure 2;
Number in the figure title: 1, drying box, 2, closed cavity, 3, the first cooling tower, 4, the second cooling tower, 5, the first preheater, 6, the second preheater, 7, the 3rd preheater, 8, circulating fan, 9, spray thrower, 10, heat exchanger, 11, bromize lithium dilute solution storage tank, 12, material, 13, circulating current, 14, cooling water, 15, steam, 16, indirect steam, 17, qi-emitting hole, 18, cylinder, 19, aperture.
The specific embodiment
The course of work of absorption lithium bromide drying system is described below with reference to Fig. 1.The course of work of this system is as follows: the recyclegas with wettability power 13 that first needs to pour certain pressure before startup in above-mentioned closed cavity 2.Then start the circulating fan 8 of sealing moisture absorption gas circulation subsystem, recyclegas 13 is after overdriving, send into material to be dried 12 by drying box 1 distribution of gas hole, bottom, in drying box 1, unsaturated circulating current 13 absorbs after the moisture that material to be dried 12 evaporates, humidity increases, and the temperature of circulating current decreases simultaneously.Then the circulating current 13 that, carries a certain amount of water vapour enters dense lithium-bromide solution spray district.Fully absorbed after steam wherein by dense lithium-bromide solution, the vapour content in circulating current 13 decreases, and after the passage of the first preheater 5 and the second preheater 6 regions, again drives and starts next round circulation through circulating fan 8.
Then, start lithium-bromide solution moisture absorption and regeneration subsystem, the hot side of heat exchanger 10 is passed into steam 15 as thermal source, to entering the lithium-bromide solution heating of heat exchanger 10 cold sides, in lithium-bromide solution, the evaporation of part moisture is heated circulating current 13 by the second preheater 6 as indirect steam, and remaining bromize lithium concentrated solution heats circulating current 13 by the first preheater 5.In order to improve the wettability power of bromize lithium concentrated solution, after preheating 15, increase by the first cooling tower 3 by cooling water, after being lowered the temperature, bromize lithium concentrated solution is sent to spray thrower 9.Spray thrower 9 sprays bromize lithium concentrated solution and contacts with the circulating current 13 that approaches saturated humidity, after most of water vapor is wherein absorbed, bromize lithium concentrated solution becomes bromize lithium dilute solution and enters bromize lithium dilute solution storage tank 11, then be admitted to heat exchanger 10 cold sides, after steam 15 drives, starting next round circulation.After lithium-bromide solution moisture absorption and regeneration subsystem operating parameter are stable, so far, this system enters stable operation stage.
Figure 2 shows that poroid gas distribution structure 1.Main feature is the aperture 17 that is less than dry solids size in dispersed placement aperture, drying box bottom.This structure can realize gas when passing through, can avoid Particle Blocking aperture and drop to circulation canal by aperture.
Figure 3 shows that column gas distribution structure 2.Main feature is to adopt column hollow-core construction, is evenly arranged the aperture 19 that a large amount of apertures are less than particle size on shape body 18 outer surfaces.This structure also can be in realizing gas and passing through, and avoids particle to stop up gas passage.
Claims (2)
1. an absorption lithium bromide clean dried system, is characterized in that:
This system comprises drying box (1), also comprises that one end communicates with the outlet of drying box (1) dry gas, the closed cavity (2) that the other end communicates with the import of drying box dry gas; In closed cavity (2), be exported to the import of drying box dry gas from drying box dry gas spray thrower (9), the first preheater (5), the second preheater (6), circulating fan (8), the 3rd preheater (7) are installed successively; In above-mentioned closed cavity (2), be positioned at described spray thrower (9) below and also there is bromize lithium dilute solution storage tank (11);
This system also comprises heat exchanger (10), the first cooling tower (3), the second cooling tower (4);
The hot side entrance of above-mentioned heat exchanger (10) is connected with driving steam (15); The hot side outlet of heat exchanger (10) is connected with the 3rd hot side entrance of preheater (7), and the hot side outlet of the 3rd preheater (7) is connected with external environment;
Above-mentioned heat exchanger (10) cold side entrance is connected with bromize lithium dilute solution storage tank (11) liquid-phase outlet; Heat exchanger (10) cold side liquid-phase outlet is connected with the hot side entrance of the first preheater (5), and the hot side outlet of the first preheater (5) is connected with the hot side entrance of the first cooling tower (3), and the hot side outlet of the first cooling tower (3) is connected with spray thrower (9); Heat exchanger (10) cold side gaseous phase outlet is connected with the hot side entrance of the second preheater (6), and the hot side outlet of the second preheater (6) is connected with the hot side entrance of the second cooling tower (4), and the hot side outlet of the second cooling tower (4) is connected with external environment.
2. the drying means that utilizes the absorption lithium bromide clean dried system described in claim 1, is characterized in that comprising following process:
Drying box (1), closed cavity (2), the first preheater (5), the second preheater (6), the 3rd preheater (7) and circulating fan (8) form the dry subsystem of circulating current;
Heat exchanger (10), the 3rd preheater (7), the second preheater (6), the second cooling tower (4), the first preheater (5), the first cooling tower (3), spray thrower (9) and lithium-bromide solution storage tank (11), form lithium-bromide solution dilution and regeneration subsystem;
Circulating current dry run: the dry subsystem of circulating current is closed system, needs to pour the recyclegas with wettability power of certain pressure before startup in above-mentioned closed cavity (2); Circulating current (13) is under the driving of circulating fan (8), enter drying box (1) by drying box (1) dry gas import, after circulating current (13) has absorbed the moisture evaporating in material (12) in drying box (1), water capacity improves, then discharge and enter bromize lithium concentrated solution spray district from the outlet of drying box (1) dry gas, the bromize lithium concentrated solution of spray thrower (9) ejection fully absorbs the water vapour in circulating current (13), drop to bromize lithium dilute solution storage tank (10) and becomes weak solution; Circulating current (13) water capacity behind this region reduces, and then, after the first preheater (5), the second preheater (6) and the 3rd preheater (7) preheating, again enters drying box (1) by dry gas import;
Lithium-bromide solution dilution and regenerative process: start steam (15) and become condensate liquid through the hot rear flank of over-heat-exchanger (10), then after the 3rd preheater (7) is cooling, enter environment; Weak solution from bromize lithium dilute solution storage tank (10) becomes two-way after heat exchanger (10) cold side is by steam (15) heating, and a road is indirect steam (16), and another road is bromize lithium concentrated solution; Wherein indirect steam (16) cooling by the second preheater (6) after, then enter environment after the second cooling tower (4) condensation; Bromize lithium concentrated solution is after the first preheater (5) is cooling, cooling through the first cooling tower (3) again, then be sprayed onto spray district by spray thrower (9), after water vapour in circulating current (13) is absorbed, drop to bromize lithium dilute solution storage tank (10), and then enter heat exchanger (10) cold side and start next round circulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210325615.2A CN102818445B (en) | 2012-09-06 | 2012-09-06 | Absorptive type clean drying system and method using lithium bromide |
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| CN103512325A (en) * | 2013-09-28 | 2014-01-15 | 昆山市周市溴化锂溶液厂 | Absorption type lithium bromide clean drying system |
| CN103542713A (en) * | 2013-09-28 | 2014-01-29 | 昆山市周市溴化锂溶液厂 | Negative-pressure absorption-type lithium bromide cleaning and drying system |
| CN103512324A (en) * | 2013-09-28 | 2014-01-15 | 昆山市周市溴化锂溶液厂 | Absorption type lithium bromide rapid clean drying system |
| CN109489387A (en) * | 2018-11-28 | 2019-03-19 | 青岛理工大学 | A kind of fire hose drying device based on solution dehumidification |
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| CN1197913A (en) * | 1997-04-09 | 1998-11-04 | 北京燕山石油化工公司研究院 | Polymer coaceration afterheat recovering method using absorbing heat pump |
| CN1464279A (en) * | 2002-06-27 | 2003-12-31 | 崔保山 | A novel vacuum system for vacuum drying |
| US20040221475A1 (en) * | 2003-05-02 | 2004-11-11 | Martin Theriault | Dry cabinets for use in moisture sensitive device management in electronics manufacturing |
| CN202792871U (en) * | 2012-09-06 | 2013-03-13 | 南京紫晶藤节能科技有限公司 | Absorption lithium bromide clean drying system |
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