CN102274642B - Method for recovering waste heat of mixed steam from desorption tower - Google Patents
Method for recovering waste heat of mixed steam from desorption tower Download PDFInfo
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- CN102274642B CN102274642B CN201010197591.8A CN201010197591A CN102274642B CN 102274642 B CN102274642 B CN 102274642B CN 201010197591 A CN201010197591 A CN 201010197591A CN 102274642 B CN102274642 B CN 102274642B
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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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a method for recovering waste heat of mixed steam from desorption tower, which belongs to the technical field of reproducible desulfurization by mainly taking a mixture of steam and sulfur dioxide as desorption steam and is used for mainly solving the technical problem that vaporization latent heat released by steam in the dehydrating process is not taken as a heat source for producing steam. The method is characterized in that: the mixed steam from the desorption tower is contacted an absorptive refrigerant; and the absorptive refrigerant which is heated by the absorption of the steam in the mixed steam from the desorption tower is taken as a heat source for producing steam and the like. The method is mainly used for dehydrating desorption mixed steam. The vaporization latent heat of the steam in the dehydrating process can be effectively utilized, so that double waste is avoided; external heat needed by the desorption tower can be greatly reduced; and the method has the advantages of easiness, practicability, high running reliability, easiness and convenience for controlling, low primary investment and running cost, and the like.
Description
Technical field
The present invention relates to a kind of exhaust heat recovering method of desorber mixed steam, belong to based on the technical field of the mixture of steam and the sulfur dioxide regenerating desulfurization that is desorption steam.
Background technology
Current, the technology of the regenerating desulfurization being desorption steam based on the mixture of steam and sulfur dioxide obtains a wide range of applications.Such as, ionic liquid method, amine process, sodium acetate method and Citrate Buffer etc., come from the strippings of desorber, be all with water vapour and gaseous sulfur dioxide for basis, and water vapour wherein occupies very high ratio.
No matter the target product of above-mentioned technology is pure sulfur dioxide (comprising liquid sulfur dioxide) or sulfuric acid or other what, all be unable to do without the process of dehydration.
The subject matter of existing dehydration is: not only the latent heat of vaporization of water vapour is wasted in the dehydration link of condensation link or other type, but also will consume a large amount of cooling waters, thus causes dual energy consumption; Particularly because the water vapor concentration in desorption steam is significantly higher than the concentration of sulfur dioxide, exacerbate system energy consumption especially.
Summary of the invention
Object of the present invention is the exhaust heat recovering method that will provide a kind of desorber mixed steam, and to overcome prior art in processed operation, the latent heat of vaporization of water vapour is wasted but also will consumes a large amount of cooling waters, causes the problem of dual waste; Water vapor concentration particularly in desorption steam is significantly higher than the concentration of sulfur dioxide.
The main technical problem to be solved in the present invention is: the latent heat of vaporization being retained in water vapour release in dehydration procedure, and used as producing the thermal source of steam.
Basic conception of the present invention is: a kind of exhaust heat recovering method of desorber mixed steam, it is characterized in that: desorber mixed steam is contacted with absorption refrigeration agent, and the absorption refrigeration agent described in being heated up by the water vapour owing to absorbing in desorber mixed steam is used as the thermal source producing steam." absorption refrigeration agent " mentioned here refers to the normal cold-producing medium adopted in general absorption refrigerating equipment, such as, and lithium bromide, lithium chloride etc.
In order to realize the described regeneration of " absorption refrigeration agent " and the combination of production of steam, the thermal source being used as described absorption refrigeration agent to produce steam described in suggestion is the thermal source used as reduction vaporization.Because in the process of reduction vaporization, " absorbing the water vapour in desorber mixed steam and the described absorption refrigeration agent heated up " itself is the supplier of heat of evaporation; Meanwhile, because moisture is removed from " absorption refrigeration agent ", " absorption refrigeration agent " itself obtains regeneration again, has namely recovered the ability absorbing water vapour.
When the heat that the heat loss of system is higher, needs supplement is larger, when the factory that particularly desulphurization plant runs exists the demand to steam, also advise that by the described thermal source being used as described absorption refrigeration agent to produce steam be use it for the heat exchange heat exchange thermal source producing steam.
Major advantage of the present invention is:
1. it can effectively utilize the latent heat of vaporization of water vapour in dehydration procedure, avoids described dual waste.
2. after the steam produced feeds back to desorber, can by the outer heating load needed for desorption process, reduce more than 60%, even 75%, 85%, more than 95% and even 100%.
3. system is simple and practical, and reliability of operation is high, controls easy, first investment and operating cost all lower etc.
Accompanying drawing explanation
Drawings attached of the present invention 7 pages, totally 7 width.Wherein:
Fig. 1 is the schematic diagram of embodiments of the invention 1.
Fig. 2 is the schematic diagram of embodiments of the invention 2.
Fig. 3 is the schematic diagram of embodiments of the invention 3.
Fig. 4 is the schematic diagram of embodiments of the invention 4.
Fig. 5 is the schematic diagram of embodiments of the invention 5.
Fig. 6 is the schematic diagram of embodiments of the invention 6.
Fig. 7 is the schematic diagram of embodiments of the invention 7.
Detailed description of the invention
The specific embodiment of the present invention is incited somebody to action in conjunction with the embodiments and accompanying drawing is described.
Embodiment 1, as shown in Figure 1.
In FIG, 1 is the desorber of regenerating desulfurization system.2 is absorption lithium bromide drying towers.3 is decompression evaporators.4 is reboilers of regenerating desulfurization system.
The key element relevant to desorber 1 comprises: the lean solution backward channel 6 after the rich solution input channel 5, desorb of desorb, the output channel 7 of desorb mixed steam, for carrying out the back channel 10 etc. of the circulation canal 8 and 9 of heat exchange and the condensed water of water vapour with reboiler 4.
The groundwork process of the present embodiment comprises:
Desorb mixed steam enters absorption lithium bromide drying tower 2 through output channel 7, with spray and under lithium bromide absorption liquid contact and remove moisture, then through mist eliminator 11, be sent to next procedure by passage 12.In lithium bromide drying tower 2, also there is following change: one side is that the temperature of lithium bromide absorption liquid itself raises rapidly, on the other hand, along with the increase of the water content of lithium bromide absorption liquid, its ability absorbing moisture reduces, and needs to be recovered simultaneously.In order to address this problem, utilize pump 13 to be injected into decompression evaporator 3 and make it spray and under, and carry out reduction vaporization under the effect of air exhauster 14.The effect that reduction vaporization causes comprises: the water content reducing lithium bromide absorption liquid on the one hand, has recovered the ability of the absorption moisture of lithium bromide absorption liquid, on the other hand, has again reduced the temperature of lithium bromide absorption liquid self, and recycle for it condition of creating.In order to prevent the escape of lithium bromide absorption liquid, in lithium bromide drying tower 2, be also provided with mist eliminator 15.At this moment, utilize pump 16 that the lithium bromide absorption liquid obtaining regeneration is returned drying tower 2, and carry out the process that circulates.
Utilization is to the adjustment of the operating temperature range of lithium bromide absorption liquid and/or adopt other method, and the method for such as heating or cooling, makes the steam of being discharged by air exhauster 14 obtain rational temperature and inject reboiler 4 be used through passage 17, passage 18.
Due in desorber 1, heat of desorption needs outside to be provided, and the radiation loss of system also needs to supplement, and therefore, the present embodiment is also provided with steam and supplements passage 19, to realize the heat balance of desorption process.
The condensed water that reboiler 4 produces, is discharged by pump 20.A part is wherein sent back to desorber 1 by back channel 10, and another part is then discharged by drainage channel 21, to maintain the water balance of system.
Embodiment 2, as shown in Figure 2.
The present embodiment is the one change carried out on the basis of embodiment 1.Main change point is: the partial condensation water of discharging from reboiler 4 does not directly return desorber 1, but imports the lean solution backward channel 6 after desorb, to reduce the dividing potential drop of the water vapour in desorber 1, and the dynamics of strengthening so-called " stripping ".
All the other contents, are understood by embodiment 1.
Embodiment 3, as shown in Figure 3.
The present embodiment is also the one change carried out on the basis of embodiment 1.Main change point is: eliminate external reboiler 4, and it to the heat supply function of desorber 1, has then been come by internal heat exchanger 22.In Fig. 3, sequence number 23 is the passages to internal heat exchanger 22 delivering vapor, and sequence number 24 is then the passage of outer row's condensed water.
Meanwhile, the latent heat of vaporization that the steam (in other words moisture) that dehydration link produces carries together with it, is injected directly into desorber 1 in the lump by passage 17.
All the other contents, are understood by embodiment 1.
Embodiment 4, as shown in Figure 4.
The present embodiment is the one change carried out on the basis of embodiment 3.Main change point is: it has recovered external reboiler 4, so that safeguard and change.In the diagram, 25 is outer input channels for steam, and 26 is then outer row's passage etc. of condensed water.Just should be noted that: compared with prior art, the heat-exchange capacity of this reboiler can reduce by more than 50% or more under normal circumstances, and this also means the significantly reduction of its size and manufacturing cost.
All the other contents, are understood by embodiment 1 and embodiment 3.
Embodiment 5, as shown in Figure 5.
The present embodiment is the one change carried out on the basis of embodiment 3.Main change point is: which eliminate internal heat exchanger 22; The reason cancelling internal heat exchanger 22 is, under the condition of the present embodiment, does not need the heat supplement of external system.Meanwhile, also dewater unit is changed.
When remaining former absorption lithium bromide drying tower 2, the alteration of dewater unit is comprised:
Add heat pipe-type desorb boiler 27, to recover the ability that lithium bromide absorption liquid absorbs moisture.This boiler comprises: heat pipe 28, burner 29 and fuel inlet 30 thereof and air intlet 31, combustion flue gas outlet 32, mist eliminator 33 etc.
Also add waste heat boiler 34, wherein, 35 is steam (vapor) outlets of this waste heat boiler 34, and 36 is its moisturizing passages.
The course of work of the present embodiment changing unit is such: after high temperature lithium bromide absorption liquid is discharged from the bottom of absorption lithium bromide drying tower 2, under the effect of pump 39, enter heat pipe-type desorb boiler 27, be further heated, and moisture is distillated, recover the ability absorbing moisture, then sent back to drying tower 2 by pump 13.In the process being sent back to drying tower 2, intercept part physical sensible heat by waste heat boiler 34, and produce steam, be sent to other user by steam (vapor) outlet 35.The steam produced in heat pipe-type desorb boiler 27, then, after being intercepted part physical sensible heat by waste heat boiler 34, be imported into again desorber 1 by pipeline 37.Meanwhile, also suggestion increases the bypass channel 38 comprising variable throttle valve 37, so that adjust the heat fed back in desorber 1.
Compared with prior art, the technical program can not cause isorrheic change, but, due to the cancellation that outside heat supply is originated, need the heat content increasing feedback steam, therefore, should note taking necessary counter-measure, after entering desorber 1 with the steam avoiding heat content higher, produce disadvantageous effect; The counter-measure of described necessity comprises employing and is equipped with special steam inlet device etc. in the inside of desorber 1.
The validity of waste heat boiler 34 relies on the general principle of the technical program just can set up, and therefore, this is also the feature of the present embodiment.
Theoretical gas production due to the technical program is twice of the quantity of steam be removed in dehydration or more, therefore, is specially adapted to separately there is enterprise used to steam.Meanwhile, the consumption of the technical program to electric energy is less.
All the other contents, are understood by embodiment 3.
Embodiment 6, as shown in Figure 6.
The present embodiment is that the one of carrying out on the basis of embodiment 4 and embodiment 5 combines and change.Main change point is: first it make to enter reboiler 4 from the steam of heat pipe-type desorb boiler 27 via passage 25, first discharges a part of heat to adjust its temperature, and then inject desorber 1 via passage 26.
All the other contents, are understood by embodiment 4 and embodiment 5.
Embodiment 7, as shown in Figure 7.
The present embodiment is that the one of carrying out on the basis of embodiment 1 and embodiment 5 combines and change.Main change point is: first it make to enter reboiler 4 from the steam of heat pipe-type desorb boiler 27 via passage 18, carries out heat exchange, then send condensed water back to desorber 1 by pump 20 through path 10.At this moment, because intrasystem water is in poised state, therefore, steam supplements passage 19 and drainage channel 21 can be treated as the mechanism for subsequent use of system, is generally all in closed condition.
All the other contents, are understood by embodiment 1 and embodiment 5.
Note that in above each embodiment, absorption lithium bromide drying tower 2 and/or decompression evaporator 3 adopt spray column or packed tower or other form, such as boiling pool or evaporation tank etc., can be determined according to actual conditions.
Also it should be noted that, when the steam source that the user of desulphurization system had not both had ready-made Gong native system to use, during demand again not to steam, the mode that above-mentioned negative pressure evaporation and heat pipe-type desorb boiler can be adopted to combine solves problem: namely part high temperature lithium bromide absorption liquid carries out reduction vaporization, and another part high temperature lithium bromide absorption liquid carries out heating evaporation.At this moment key control point is: adopt heat pipe-type desorb boiler to carry out the steam of the part fecund evaporated, should balance each other with the thermal loss of the heat of desorption needed for desorber and system.Adopt this scheme, do not affect energy-saving effect of the present invention; Meanwhile, compared with prior art, the power of required desorb boiler is very little, drops into lower, and this desulphurization system can also be made to become the system of an independent work.
In addition it is to be noted that above-described embodiment is all case of the present invention, one of their effect plays explanation to the present invention, and should not be construed as any restriction made the present invention.
Claims (4)
1. an exhaust heat recovering method for desorber mixed steam, is characterized in that:
1.1 make desorber mixed steam contact with absorption refrigeration agent; Absorption refrigeration agent is selected from lithium bromide or lithium chloride;
Desorb mixed steam enters absorption lithium bromide drying tower (2) through output channel (7), with spray and under lithium bromide absorption liquid contact and remove moisture, then through mist eliminator (11), next procedure is sent to by passage (12);
Utilize pump (13) that lithium bromide absorption liquid is injected decompression evaporator (3) and make it spray and under, and under the effect of air exhauster (14), carry out reduction vaporization; Mist eliminator (15) is also provided with in decompression evaporator (3); Utilize pump (16) that the lithium bromide absorption liquid obtaining regeneration is returned drying tower (2), and carry out the process that circulates; The steam of being discharged by air exhauster (14) obtains rational temperature and injects reboiler (4) be used through passage (17), passage (18);
1.2 the water vapour owing to absorbing in desorber mixed steam heated up described in absorption refrigeration agent be used as to produce the thermal source of steam.
2. the exhaust heat recovering method of desorber mixed steam as claimed in claim 1, is characterized in that:
Add heat pipe-type desorb boiler (27), this boiler comprises: heat pipe (28), burner (29) and fuel inlet (30) thereof and air intlet (31), combustion flue gas outlet (32), mist eliminator (33);
Also add waste heat boiler (34);
After high temperature lithium bromide absorption liquid is discharged from the bottom of absorption lithium bromide drying tower (2), under the effect of pump (39), enter heat pipe-type desorb boiler (27), be further heated, and moisture is distillated, recover the ability absorbing moisture, then sent back to drying tower (2) by pump (13); In the process being sent back to drying tower (2), intercept part physical sensible heat by waste heat boiler (34), and produce steam, be sent by steam (vapor) outlet (35); The steam produced in heat pipe-type desorb boiler (27), then, after being intercepted part physical sensible heat by waste heat boiler (34), be imported into again desorber (1) by pipeline (37).
3. the exhaust heat recovering method of desorber mixed steam as claimed in claim 1, is characterized in that:
The described thermal source being used as described absorption refrigeration agent to produce steam is the thermal source used as reduction vaporization.
4. the exhaust heat recovering method of desorber mixed steam as claimed in claim 1, is characterized in that:
The described thermal source being used as described absorption refrigeration agent to produce steam uses it for the heat exchange heat exchange thermal source producing steam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010197591.8A CN102274642B (en) | 2010-06-11 | 2010-06-11 | Method for recovering waste heat of mixed steam from desorption tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010197591.8A CN102274642B (en) | 2010-06-11 | 2010-06-11 | Method for recovering waste heat of mixed steam from desorption tower |
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| CN102274642A CN102274642A (en) | 2011-12-14 |
| CN102274642B true CN102274642B (en) | 2015-05-20 |
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| CN103768893B (en) * | 2012-10-19 | 2016-06-15 | 中国石油化工集团公司 | A kind of glycol unit reduces the method for ethylene oxide absorption coolant-temperature gage |
| CN106039960B (en) * | 2016-06-13 | 2018-04-24 | 大连理工大学 | A kind of collecting carbonic anhydride liquefaction process of cascade utilization fume afterheat |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1186334A1 (en) * | 2000-08-31 | 2002-03-13 | The BOC Group plc | Treatment of a gas stream containing hydrogen sulphide |
| CN101357294A (en) * | 2007-08-04 | 2009-02-04 | 山东省冶金设计院有限责任公司 | Renewable devulcanizing technological process and use thereof |
| CN101362047A (en) * | 2007-08-04 | 2009-02-11 | 山东省冶金设计院有限责任公司 | Renewable devulcanization technological process and use thereof |
| CN101721894A (en) * | 2008-10-17 | 2010-06-09 | 山东省冶金设计院有限责任公司 | De-sulfur method with reproducible desulfurizer for preparing sulfuric acid as final product |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101474929B1 (en) * | 2007-05-29 | 2014-12-19 | 더 유니버서티 오브 레지나 | Method and absorbent composition for recovering a gaseous component from a gas stream |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1186334A1 (en) * | 2000-08-31 | 2002-03-13 | The BOC Group plc | Treatment of a gas stream containing hydrogen sulphide |
| CN101357294A (en) * | 2007-08-04 | 2009-02-04 | 山东省冶金设计院有限责任公司 | Renewable devulcanizing technological process and use thereof |
| CN101362047A (en) * | 2007-08-04 | 2009-02-11 | 山东省冶金设计院有限责任公司 | Renewable devulcanization technological process and use thereof |
| CN101721894A (en) * | 2008-10-17 | 2010-06-09 | 山东省冶金设计院有限责任公司 | De-sulfur method with reproducible desulfurizer for preparing sulfuric acid as final product |
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