CN1076521A - In the vapours dry run, get rid of improving one's methods of steam - Google Patents
In the vapours dry run, get rid of improving one's methods of steam Download PDFInfo
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- CN1076521A CN1076521A CN 93101458 CN93101458A CN1076521A CN 1076521 A CN1076521 A CN 1076521A CN 93101458 CN93101458 CN 93101458 CN 93101458 A CN93101458 A CN 93101458A CN 1076521 A CN1076521 A CN 1076521A
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Abstract
Be entrained with the drying equipment of making dry gas as water vapour-product stream from superheated steam with the steam diversion of material and/or balance waste material emit the back to small part indirectly and cooling medium heat exchange and condensation, condensate carries out step distillation post processing at least, in indirect heat exchanger (2), absorb the condensation energy of vapor stream by the shunting of circulation distillation equipment (5) effluent, the steam condensate of formation is delivered to (5) and is shunted direct positive energy exchange with the backflow of the steam condensate of taking out from the discharge liquid phase, carries the vapor phase that the high liquid state of material concentration is shunted and come out (5) secretly from the taking-up of (5) discharge gate and can suitably handle.
Description
The present invention relates to handle aqueous feed and the dry field of dry useful material and/or balance waste material aqueous compositions by dry gas based on vapours.
The vapours dry technology all plays people in its each different developing stage in early days and notes widely in the large-scale industry drying process.The superheated vapour that adds as dry gas circulate in closed system and flows out or the direct condensation possibility of the steam shunting of extracting out provides good prerequisite for this class drying equipment from closed circuit, makes its blowdown flow rate that influences environment minimizing.Can see that in technical literature the vapours drier has caused the attention that people are increasing, particularly when contact drying, the drying in itself and the pure steam atmosphere can be combined.Corresponding vapours drier with whole contact area of heating surface is in industrial for example brown coal mud and drying sludge or the root crops crushed products of can be used at present, biological substance and other organic substance drying are to be used as animal feed, as can be referring to D.Gehrmann " Entwicklungsten-denzen der Trocknungstechnik in der Chemischen Indussrie ", Chem.-Ing.Tech.62(1990) A 512-520, especially wherein merogenesis 2.2 and 3.1 notices that especially the difference of this class vapours drying equipment of exploitation is developed possibility.Therefore, drying for example can be carried out in the vapor recycle stage of difference setting.Dry section also can make the vapours flash dryer.In fact corresponding technology be used for making pulp and other dry natural materials at present, as timber and coal.
But the property improved of vapours drying process principle is not limited in this very unconspicuous replacement material, the applicant has illustrated the operating principle of using useful material and composition thereof in many early stage patent applications, these temperature of charge sensitiveness are obvious, but user or consumer only are applied to be worth the high improvement form of number, particularly make and pile up and/or loose powder or grain.This respect, the applicant has illustrated the solid-state accumulation of particulate or loose useful material or its mixture manufacture method in its early stage patent application DE-A 40 30 688, these materials can be used as wetting agent, washing agent and/or cleaning agent also can be made into its aqueous compositions, and wherein superheated steam is as the dry heat air-flow.And before granular material is impaired because of heat release, stopped its drying.
In other further patent application of applicant, concrete exploitation has been described and has improved this drying process that carries out as thermal current with superheated steam and at wetting agent, washing agent and/or cleaning agent useful materials and composition thereof are made the application in field.In this respect, can be especially referring to early stage German patent application P42 04 035.3, P42 04 090.6, and P42 06 050.8, P42 06 521.6 and P 42 06 495.3.
The present invention seeks to propose by the following stated mode further the industrial applicable vapours drying means of exploitation and thereby improve its operability, in these vapours drying systems are also included within.The technology of the present invention is conceived to following problem: the vapours drying is got rid of vapor stream by drying facility and later separation and is carried out the water yield that vapor stream is equivalent to evaporate in the drying process in flow of superheated steam cyclic drying equipment.The vapor stream that takes out in the vapor recycle logistics more or less is entrained with for example useful material of powdery and/or balance waste material.Therefore before according to a conventional method with steam-product shunting separately, from this vapor recycle stream, tell this useful material of carrying secretly and/or balance waste material as far as possible, can carry out this separation by filter process, but also can carry out gravity separation process usually, cyclone separator especially is set, but can not tell the entrained solid material fully, the vapor stream of extracting out from vapor recycle at last also contains remaining being entrained with material and/or balance waste material.A small amount of in case of necessity not condensable gases composition that occurs can be got rid of from system by the steam diversion of continuous extraction equally in the dry run.
Optimize the technology of steam drying technology or other application vapours treatment step, in corresponding granulating technical process, problem is the water vapour shunting of handle extracting out in subsequent technique, thereby makes the material of entrainment with steam return in the dry run or discharge in the mode that does not harm environment as far as possible at least.
The technology of the present invention purpose is to improve aforesaid operations greatly, wherein especially can be to extracting steam diversion out with discharge waste or do not have waste gas and/or non-wastewater discharge is handled not basically, simultaneously again for this reason purified treatment increase expenditure greatly, therefore the present invention can one or the multistep subsequent treatment process in obtain purity than higher steam condensate, can not increase energy consumption greatly again simultaneously.
The present invention's technical solution that achieves the above object is most of steam condensate that subsequent heat treatment is imitated pure formation, wherein can reach the further purpose of the economy of energy benefit of this post processing of above-mentioned optimization by the circulation of product stream described later or shunting.
The present invention's first scheme relates to the optimization method of getting rid of the steam diversion be entrained with useful material and/or balance waste material, and this shunting does from superheated steam is made the drying equipment of dry gas that steam one product stream is discharged and to small part and cooling medium is direct and/or indirect heat exchange and condensation.
This scheme of the inventive method is characterised in that the steam condensate that obtains is sent to and carries out connecing heat treatment after at least one step, wherein use from the condensation heat of steam diversion release after the steam condensate that the cold medium adding of condensation of shunting as the band material steam that takes out in the drying equipment obtains earlier and carry out subsequent heat treatment, and heat treatedly carry that the material steam condensate is follow-up to be called " distillation " secretly, send into and, from the discharge mutually of distillation, take out therebetween to be entrained with and shunt as aqueous liquid phase with material and/or the high liquid state of balance waste material concentration in the condensation heat effect lower part evaporation that obtains.
The present invention relates on the other hand with this method and obtains useful dry material, and its mixture and/or balance waste material wherein waste gas and waste water can not occur basically, adopts aqueous compositions to handle, and especially gets with superheat steam drying.This purposes of this method is particularly useful for not having the optimization drying that trash discharge ground carries out useful material and composition thereof, and these materials can be made wetting agent, washing agent and/or cleaning agent and/or be used for these preparations.But this wet or moisture application that adds materials also is an important aspect disclosed by the invention, has wherein solved the blowdown problem in its processing or the dry run.Only as an example, but the present invention's sludge-drying or animal excrements, and as barnyard manure, the drying of the known mud that this has obtained in Anaerobic Treatment in fact makes its odorless.
Another pith disclosed by the invention is to handle poisonous material, as make its dry and/or caking with vapours.Only as an example, can handle the useful mixtures of materials of high toxicity, as pesticide or herbicide, from getting rid of useless waste material angle, its drying and/or caking are very difficult.If for example producing the drying agent form, as sending into the gas phase of making auxiliary agent in powder and/or the piece material process, carrying then that the useful material of toxicity and its discharge from send into gas phase secretly all is great technical problem.But discharge toxicity or the useless balance waste material of other character also is serious practical problem from carrying secretly accordingly the material pneumatic.The present invention is reaching improvement effect aspect the existing applicability.
Key disclosed by the invention is the combination of following aspect:
That take out from the vapours drying equipment and be entrained with steam diversion with material and/or balance waste material and be equivalent to the water yield of evaporating the aforementioned drying equipment, follow-uply heat-treat again in handling at least one step, especially evaporation is purified, and this purification can or can not influence the energy economy effect of overall process substantially.
For addressing this problem, noticed following technical factor in the preferred version of the present invention: the steam diversion elder generation condensation of telling from steam drying equipment that has usually more than 100 ℃ forms liquid phase, wherein the present invention preferably is converted into liquid steam condensate with total vapor phase, can guarantee useful material and/or the balance waste material carried secretly thus, as long as be not gas phase under technological temperature, all from the steam condensate liquid phase, extract and send into the subsequent evaporation purification step with this form.
The steam diversion of telling in the vapours drying equipment carry secretly and technological temperature down can not change liquid phase into for the composition of gaseous state when this vapor stream condensation, only need from steam condensation and subsequent treatment thereof, to tell through simply being separated and discharge, follow-uply also can carry out simple process in the mode that environmental protection allows.Separating gas phase in the first step of this steam diversion condensation operation is not necessary generally only carrying out under particular case.In all cases, the separation gas phase amount that this only relates to narrow range makes its discharge that helps environment without difficulty, and this also makes great efforts to reach always.
The steam condensate stream that forms changes vapours dry follow-up evaporation or evaporation equipment over to liquid phase.But when returning, a this steam condensate part can be discharged from the distillation equipment top effectively in the important aspect of the present invention, afterwards it is sent into follow-up circulation or maintenance:
The steam condensate of taking out is partly delivered to from the vapor stream condensation indirect heat exchanger that vapours equipment takes out, and wherein absorbs the evaporation or the condensation energy of the steam diversion of sending into heat exchanger through indirect heat exchange.The result is the condensation that reaches from the steam-like streaming request that drying equipment takes out.Condensate liquid is directly sent into Equipment for Heating Processing.Simultaneously, send to the steam condensate shunting of carrying out the vapor stream condensation and taking out from the distillation equipment top earlier and can deliver to heat treatment step with the condensation that absorbs after having passed through as the indirect heat exchanger of carrier, especially distillation equipment is gone in loopback.By this way, the energy of sending into indirect heat exchanger is delivered to indirectly or directly distillation equipment and can purifying by the inventive method evaporated vapor condensate stream and distillation.
From the corresponding taking-up shunting of distillation equipment, send to the condensation heat that absorbs the steam diversion of sending into gaseous state by indirect heat exchanger in preferred especially the present invention program, loopback is gone into distillation equipment and is directly mixed with liquid steam condensate (effluent) then.But superheater or heat exchanger are linked evaporation/distillation equipment again in a known way.Can change follow-up distillation equipment over to suitable from condensation or the evaporation that indirect heat exchanger will directly absorb by the known method control technological parameter of professional.Can send into the shunting of high steam condensate by known way effectively, wherein, wherein preferably use high pressure, be mainly liquid phase at least through behind the heat exchanger so that send into the steam condensate of circulation by indirect heat exchanger.
In continued operation, liquid phase steam condensate (discharge liquid) necessary in the inventive method is quite limited, this on the one hand can by with steam condensate from the distillation equipment circulation through or by indirect heat exchanger and follow-uply condensation or evaporation can loopback be gone into distillation equipment determine.
In addition, post processing purpose of the present invention also merits attention, and all on-gaseous are carried secretly in liquid steam condensate useful material and/or balance waste material are enough, in such a way, are sent in the subsequent process cycles of the present invention as shunting.Correspondingly, can continuously shunting be delivered in the effluent of the distillation equipment that exists with liquid phase during the present invention is open, that wherein comes out from the vapours drying equipment carries the material concentration height secretly in batches or preferably.This shunting can be indirectly or is directly delivered in the vapours equipment.Directly this concentrated logistics of loopback need not be further explained.The example of loopback is as follows indirectly: useful material is able to drying in the vapours drying equipment, by on purpose to make the vapours drying equipment reinforced to optimize performance with containing water modulation, add the useful material dry the vapours drying equipment or the default regulating step of its mixture from follow-up distillation equipment effluent then thereby will contain the concentrate that is entrained with material earlier.
Show, can make useful material or the balance salvage department handling water vapour and carry secretly reach limited separating substances by simple the present invention's one step heat treatment.For this possibility, merit attention the following fact especially: the operating condition in the vapours drying equipment is mainly determined by the dried material operating result that requires.The steam diversion of taking out can correspondingly be in the operating condition of pressure and specified temp, and it is delivered to useful material and/or the balance waste material of carrying secretly in a large number with the water vapour shunting of taking out.Corresponding therewith, the follow-up distillation purification of the present invention condition no longer meets the requirements of the dry result of requirement of vapours drying equipment, but sure is for selected operating condition, drying is optimized in the requirement that can reach water vapour and useful material of carrying secretly and/or balance salvage department, it is apparent that wherein can reach completely newly improvement system by follow-up procedure of processing separates possibility.The present invention openly is not limited only to this possibility, by the suitable order and the combination of procedure of processing, the operating condition variation of this requirement is reached by the energy economy benefit of using total system, can not roll up energy consumption again simultaneously.
The vapor phase of taking out from evaporation or distillation equipment is follow-up, and condensation again wherein reaches enough purification purposes by preferred indirect heat exchange, also can further process in case of necessity.The indirect heat exchange that reaches in this two step heat transfer process can guarantee that this condensation energy transmission can prevent from unnecessarily to carry secretly any useful material and/or balance waste material.In this twice condensation process, may discharge the small amount of exhaust gas phase by the steam diversion performance of carrying material secretly that adds.The appearance amount of this gas phase seldom can make the discharge that allows on the environment be guaranteed, can not give industrial much difficulties of bringing again simultaneously.
The evaporation of steam condensate in distillation is purified can be by shirtsleeve operation one step finish, this scheme that designs distillation equipment as far as possible simply may be the purification of the steam diversion of carrying material secretly that can reach enough when handling by such step, separable again useful material of carrying secretly and/or balance waste material simultaneously.Separation for the steam condensate of carrying material secretly has proposed very high requirement, thereby makes the processing of liquid towards logistics of the present invention that a lot of possibilities can be arranged, and mutually can be in conjunction with application.
In first scheme, the present invention proposes, by being equipped with corresponding packed tower or the granular filling material tower distills purification.For this scheme, the design of this fractionating column and operation can be used all professional general knowledge of this specialty.The rectification temperature of optimizing can make various problems be resolved.
Carry secretly in the scheme of steam condensate of material in another optimization process, wherein combine with newly designed fractionation distillation scheme, the present invention proposes to carry out numerous distilation steps.Further in the scheme, in multistage evaporation equipment, as at 5 grades at the most, as operating in 2 or 3 grades of equipment.All can the hot water form obtain under the hot superfluous various situations of Chu Xianing in case of necessity.
In a preferred version, the present invention proposes up-to-date Treatment Design scheme, wherein be separated from each other mutually in regular turn again a plurality of evaporations or distillation equipment are set, and the number of treatment step is virtually completely determined by the energy economy benefit of the steam diversion of carrying material secretly of taking out in the steam drying equipment.By the present invention, the vapor phase condensation heat of intermediate processing steps changes the discharge liquid of the condensate that evaporates in follow-up distillation equipment through preferred indirect heat exchange.Shunting also can be imported this condensation heat in the follow-up distilation steps into as carrier, and wherein design may be same as the design of front for a step distil process.The liquid state shunting of the maintenance condensation heat of taking out from indirect heat exchanger is correspondingly directly imported into the follow-up distilation steps, carries out under measuring superpressure in case of necessity and directly mixes with the condensate stream of taking out in the heat exchanger.By this way, these condensates can evaporate in subsequent process steps and can tell vapor phase of further purifying by the present invention and the discharge liquid phase that contains useful material of high concentration and/or balance waste material.
Operate with so many mutual series connection steam or distilation steps, just can be from the discharge liquid of each distilling period or from the minority distillation equipment selected or only extract useful material and/or balance waste material out from a distilling period.Under the in the end known situation, carry the discharge shunting of material secretly and generally from last distillation equipment, take out.The vapor phase of each distilling period can its total amount be sent into follow-up distilling period as condensate liquid, but equally also can be only the part of the condensed steam phase of taking out from middle distilling period be sent into follow-up distilling period.In general, the character by the steam diversion of carrying material secretly handled is entrained with and operates possibility with the performance of material and/or balance material and the discharge that requires thus and can determine the PROCESS FOR TREATMENT condition.
By the mutual series connection destilling tower of such majority is set, just can each operational phase with different pressure, for example can between middle distilling period and follow-up distilling period, operating pressure progressively be reduced.In this respect, by the present invention, can in normal pressure limit, under lower pressure, make from the follow-up vacuum evaporation of the condensate liquid of last treatment step.In general, segmentation reduces operating pressure and can make in distillation stage of mutual series connection between each stage to fall with lower pressure and operate like this.For this operation, follow-up destilling tower operating pressure is suitably descended, make the boiling point of water descend about 20-30 ℃ at most, as not being higher than 20 ℃, especially be not higher than 10 ℃.The quite low boiling point of follow-up distilling period descends, and Duos about 5 ℃ as being low to moderate than water boiling point in middle destilling tower, is exactly effectively for the present invention.
The measure that progressively reduces operating pressure like this in limited range has reduced the total operation expense of technology, guaranteed the total energy economic benefit of treatment process and optimized the result that requires the steam diversion of carrying material secretly that reaches, simultaneously expense and ecology influence under the operating condition met the requirements.
When preferably adopting indirect heat exchange, carry out a step or the operation of multistep steam treatment and directly steam is sent into condensate liquid by prior art among the present invention through evaporation equipment.
All send to again under the various situations of the energy that the steam that comes out from last destilling tower is possessed and carry out indirect heat exchange, as be used to heat domestic water and can not impair overall process.Condensate stream after the processing can meet the requirements of purity, can be used as domestic water, as is used for doing to clean bath with purified industrial equipment, in case of necessity can be fully as the wastewater application or the discharge that meet environmental requirement.
As can be seen, treatment process of the present invention is applicable to the processing of the steam diversion of carrying material secretly in any source.Equally, the present invention is not only applicable to the spray-drying or the eddy flow laminated devices of carrying out with vapours, and can be used for any other technology, as the granulation of carrying out with vapours, particularly build granulating, the thin layer evaporator of corresponding operating, especially film evaporator, wherein the dry or evaporation material in the thin layer is movable or do not move, and these all are suitable for operating by the inventive method.Under all binding operation situations, the present invention can carry out the vapours operating procedure effectively: compare with using the gas phase operation situation of not sending into circulation or only partly sending into circulation in the existing method, the present invention has avoided off-air or toxic emission problem greatly with the vapours operation of circulation.Can reach harmless basically discharge extremely effectively with the steam diversion operation of carrying material secretly of discharging among the present invention.The small amount of exhaust gas of the Chu Xianing discharge that can guarantee to be in the operation stage of design and not harm environment in case of necessity, as the heat treatment by requiring, the particularly burning of Yao Qiuing is by biofilter etc.The waste water eliminating also can be avoided.Therefore the present invention can relate generally to the useful material in any source and/or concentrating of balance waste material, and drying is pulverized and/or granulation.Above-mentioned wetting agent, the useful material of washing agent and/or cleanser and the drying of its mixture and/or granulation and from the mud that communal facility and/or waste fitment come out doing of a large amount of balance waste materials that occur also only be giving an example of application of the present invention with withing fixed attention.But this is two special examples, and is very big to the practical significance of application of the present invention.
The early stage German patent application P42 04 035.3 of above-mentioned DE-A 40 30 688 and applicant, P42 04 090.6, P42 06 050.8, and P42 06 521.6 and P42 06 495.3 have all illustrated each importance with superheat steam drying washing agent and the useful material of cleaning products.These patents or patent application disclosure all relate to technical field disclosed by the invention.Branch's problem is promptly carried these useful materials or its mixture secretly in the industrially drying method, be so-called Plwming, promptly carries particularly non-ionic surfactant component secretly by its water vapour volatility.Among the present invention, mainly be to distill the follow-up purification of 1 or multistep of discharging in the liquid processing procedure by the present invention to make the Nio surfactant component Pluming that carries secretly realize separating.
Drying sludge is the example that solves another problem, wherein improves one's methods by the invention provides: particularly a large amount of at present Anaerobic Treatment mud that occur still have very strong stink at present in its dry run.From in early days as can be seen, drying sludge carries out with vapours and vapor recycle, and wherein problem is to handle the steam diversion of carrying material secretly of extracting out, and this is equivalent to evaporated water and must discharges in the mode that does not harm environment.The present invention realizes in the above described manner that promptly in case of necessity gradation separates not condensable and the gas phase of strong especially Austria's flavor arranged and make it innoxious, as by heat treatment.Simultaneously, the odor strength of the vapour phase of multistep condensation is in case of necessity descended, and makes it discharge the problem of not having in common mode, and is wherein as described herein, and this purification operations need not be given in the follow-up treatment step of steam drying of the present invention basically extra power is provided.
Fig. 1 and 2 illustrates steam treatment scheme of the present invention.
Send into indirect heat exchanger 2 and all be condensed into liquid phase through pipeline 1 by Fig. 1 from the steam diversion of carrying material secretly that vapours equipment comes, wherein occur in case of necessity on a small quantity condensible gas for example can extract out and discharge in a suitable manner through pipeline 14.Send into distillation equipment 5 with pump 3 through pipeline 4 from the liquid stream that heat exchanger 2 comes out.To discharge condensate liquid with pump 6 through circulation pipe 7 from the outlet of this distillation equipment 5 and deliver to heat exchanger 2.This condensation shunting absorbs the condensation energy of the steam diversion of sending into through pipeline 1.The liquid circular flow of corresponding heating is sent into distillation equipment 5 and is given up with the steam condensate amount that pipeline 4 is sent to direct heat transfer from the distillation equipment discharge gate through pipeline 8 again.
Discharging the concentrate part takes out from 5 through pipeline 9.Steam drying equipment is gone in this concentrated logistics directly or indirectly loopback.
The water vapour that produces in 5 takes out and sends into indirect heat exchanger 11 through managing 10, for example carries out the water heating, then hot water is delivered to indirect heat exchanger 11 and from wherein discharging through 13 again.The steam condensate of taking out from heat exchanger 11 through pipeline 15 is used as domestic water again or is got rid of as waste water.The vapor stream of condensible gas attitude composition can be through pipeline 12 as toxic emission containing in case of necessity of coming out from distillation equipment 5.
Fig. 2 understands that for example carrying out for 2 steps by the present invention handles the steam diversion of carrying material secretly.
Carrying the vapor stream of material secretly sends into indirect heat exchanger 17 and leaves heat exchanger as condensate liquid through pipeline 16.Steam condensate can be sent into first distillation equipment 20 with pump 18 and pipeline 19, through indirect heat exchanger 17 send to the vapor stream condensation of carrying material through liquid state shunting pipeloop 22 and 23 from this distillation equipment discharge gate with pump 21 again.
The steam condensate of sending into first destilling tower 20 through pipeline 19 uses the condensation sent into through pipeline 23 or the evaporation can be by directly will and evaporating from 19 and 23 logistics mixing again.Steam leaves first destilling tower and be condensed into liquid phase in indirect heat exchanger 25 through pipeline 24.Can the further transport of condensate of several different methods through pipeline 26, according to purity requirement, can be used as domestic water and discharge, also can be used as waste water in case of necessity and get rid of, but also can equally this condensation material be sent into the not shown concrete mode of after-fractionating tower 28().
To not evaporate and do not send into after-fractionating tower 28 from distillation equipment 20 through pipeline 27 as the necessary discharge section of recycle stream, and carry out DIRECT ENERGY exchange with second recycle stream of heating, discharge liquid and circulate and indirect heat exchanger 25 and reflux pipeline 31 are connected into 28 by extracting part out from 28 through pipeline 30 with pump 29.The vapor phase that forms in second vaporising device is left this equipment and is sent to through indirect heat exchanger 34 through pipeline 33 and for example produces hot water (input and output pipeline 36).Wherein the condensate of Chan Shenging is sent into indirect heat exchanger 34 and can be re-used as domestic water through 38 and reaches any application purpose and/or discharge as waste water.The liquid phase ingredient that contains highly useful material and/or balance waste material comes out to go into the vapours drying process after manage 30 indirect or direct loopbacks from after-fractionating equipment 28 outlets.
Fig. 2 shows with the possibility of pump 37 adjusting after-fractionating tower internal pressures and lower than the operating pressure of first destilling tower.
Following embodiment has illustrated concrete operations data and the result by the present invention's processing shown in Figure 1.
Example 1
In the experimental scale hydro-peening tower of Niro-Atomizer company, use detergent paste to produce the test of powder product through superheated steam.The slurry stream of sending into is 20.8Kg/h, is equivalent to volume 16l/h, and wherein slurry is moisture 50%, enters subsequent process steps after will sending into circulation and only make the water yield that enters product leave circulation as the water vapour that drying medium is used.
The steam diversion condensate liquid that leaves circulation that forms concentrates in the evaporimeter that has rotation facility and built-in heat exchanger earlier, wherein the steam-heated evaporator by emitting from drying cycles.The vapours of coming from drying cycles at duration of test with 179 ℃ of heat exchangers that enter evaporimeter.When being sent into heat exchanger, concentrating return-flow liquid it should be noted that capacity of returns should guarantee the condensation of the vapor stream in the evaporation equipment and guarantee that loopback concentrates the overheated of logistics.It should be noted that in process of the test backflow should be regulated, so that heat exchanger is enough to make the direct total condensation of steam of generation.
The vapor stream that takes out from evaporimeter indirect heat exchange and produce 81 ℃ of hot water (15 ℃ of inlet temperatures) after condensation is measured and is about 74l/h.Leave 63 ℃ of the condensate temperatures of heat exchanger, the about 9.6kg/h of flow.
Under condenser, a small amount of air-flow can be arranged, can be from the uncooled part of excess air and vapor stream.This air-flow is not quantitative.
The about 0.2kg/h of concentrated logistics that evaporation equipment produces and that therefrom take out.
Example 2
Carry out another test in the drying equipment of " small-scale production " type Niro-Atomizer company, wherein detergent paste is by the superheated steam spray-drying.At duration of test, slurry stream (50% is moisture) is 32.5kg/h, i.e. 25l/h.Make the water vapour of drying medium and send into circulation, wherein excess steam is emitted from circulation.
Leave the steam of circulation and deliver in the heat exchanger of subsequent evaporation equipment, the concentrate of wherein emitting is delivered to evaporimeter as charging.During the humid test of the vapor stream that produces in the heat exchanger be 168 ℃.
The vapor stream that produces in the evaporimeter is used for producing 79 ℃ of hot water (15 ℃ of cold water temperatures) in condenser, duration of test produces about 109.8l/h hot water, 66 ℃ of the concentrate temperature that exports mensuration, concentrates the about 13.9kg/h of logistics.Can determine the air-flow that do not included in the test behind the condenser.
Duration of test takes out the concentrated logistics of about 0.4kg/h from evaporimeter.
Claims (14)
1, contain the nesting optimization method that is entrained with the vapor stream of material and/or balance waste material, this vapor stream as steam one product stream from the drying equipment of making dry gas with superheated steam, emit the back to small part through and cooling medium directly and/or indirect heat exchange and condensation, it is characterized in that the steam condensate that produces carries out at least one step heat treatment, wherein the condensation of the steam diversion of carrying material secretly of taking out as drying equipment adds the steam condensate that obtains in advance with cooling medium, heat-treat with the condensation heat that absorbs from steam diversion then, the steam condensate that wherein will carry material secretly is sent into the evaporation again of heating purifying step (condensing tower) and the condensation heat effect that is produced therein and part as aqueous liquid phase, wherein takes out from the discharge liquid phase of destilling tower to have high concentration and be entrained with liquid state shunting with material and/or balance waste material.
2, the method for claim 1 is characterized in that the destilling tower effluent is by overheated with the direct or indirect heat exchange of the condensation heat of the steam diversion of sending into gaseous state.
3, claim 1 and 2 method, it is characterized in that discharging liquid and indirect heat exchanger can be set or preferably the steam condensate shunting be discharged the liquid from destilling tower and take out for making the condensation shunting condensation of carrying material secretly become destilling tower, absorb the condensation heat of the steam diversion that steam state sends into by indirect heat exchange, loopback is gone into destilling tower and is directly mixed with liquid steam condensate then.
4, claim 1 and 3 method, the transmission that it is characterized in that containing condensation heat in the destilling tower of flow media is under high pressure carried out, and its mesohigh preferably should make steam condensate (effluent) shunting of sending into circulation be mainly liquid phase at least after leaving heat exchanger.
5, the method for claim 1-4 is characterized in that further handling in case of necessity after the condensation by preferred indirect heat exchange from the vapor phase that destilling tower takes out again again.
6, the method for claim 1-5 is characterized in that in each condensing tower that the not condensible gas that occurs in case of necessity discharges in the mode that does not harm environment.
7, the method for claim 1-6 is characterized in that being rich in useful material and/or balance waste material and the evaporation drying step is gone in the indirect or direct loopback of liquid state shunting of taking out from the destilling tower effluent.
8, the method for claim 1-7 is characterized in that carrying out multistep with the steam condensate stream of carrying material secretly, as 2 or 3 step distilation steps, wherein preferably by the heat exchange in these follow-up distilation steps from the condensation process heat absorption of middle distilation steps.
9, the method for claim 1-8 is characterized in that the progressively step-down of distilation steps of series connection mutually.
10, the method for claim 1-9 is characterized in that first destilling tower operates under normal pressure, after-fractionating tower is being operated than under the low pressure, is no more than 20 ℃ as reducing than water boiling point, particularly is no more than 10 ℃.
11, the method for claim 1-10 is characterized in that carrying out the evaporation of steam condensate in step distillation processing and/or multistep fractionation still-process.
12, the method for claim 1-11, in the useful material or its mixture dry run that it is characterized in that using by oneself the steam diversion of discharging superheated steam carries out, useful material can be used as wetting agent, washing agent and/or cleaning agent and/or be used for these preparations.
13, the method for claim 1-11, the steam diversion that it is characterized in that discharging is from the water vapour dry run that is discharged to the water-containing materials in the environment, as from the toxic substance material, as pesticide, be the solid-state useful material of toxicity and/or the drying and/or the granulation process of waste material or the stink material of improving oneself under herbicide and other room temperature, as mud, the dry run of anaerobic sludge or animal wastes particularly.
14, the method for the claim 1-12 waste water ground that is used for essentially no waste gas and carries material secretly obtains dry useful material and its mixture, these materials can be used as wetting agent, washing agent and/or cleaning agent and/or be used for these preparations and dry and get through superheated vapour with its aqueous compositions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93101458 CN1076521A (en) | 1993-02-11 | 1993-02-11 | In the vapours dry run, get rid of improving one's methods of steam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 93101458 CN1076521A (en) | 1993-02-11 | 1993-02-11 | In the vapours dry run, get rid of improving one's methods of steam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688755B (en) * | 2007-08-07 | 2012-06-27 | 马斯公司 | Method and apparatus for drying a material |
| CN102947661A (en) * | 2010-06-22 | 2013-02-27 | 德商弗朗霍夫应用研究促进学会 | Method for recovering volatile components from a solid |
-
1993
- 1993-02-11 CN CN 93101458 patent/CN1076521A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688755B (en) * | 2007-08-07 | 2012-06-27 | 马斯公司 | Method and apparatus for drying a material |
| CN102947661A (en) * | 2010-06-22 | 2013-02-27 | 德商弗朗霍夫应用研究促进学会 | Method for recovering volatile components from a solid |
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