CN103925814B - A kind of combined type heat-exchange system - Google Patents
A kind of combined type heat-exchange system Download PDFInfo
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- CN103925814B CN103925814B CN201410167320.6A CN201410167320A CN103925814B CN 103925814 B CN103925814 B CN 103925814B CN 201410167320 A CN201410167320 A CN 201410167320A CN 103925814 B CN103925814 B CN 103925814B
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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
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- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses a kind of combined type heat-exchange system, belong to high-temperature hot recovery system technical field.A kind of combined type heat-exchange system, have high-temperature medium import including one end, the other end has the housing that high-temperature medium exports, it is provided with heat-exchanging tube bundle in described housing, described housing is externally provided with and the heat-exchanging tube bundle drum by pipeline communication, and described pipeline includes connection down-comer between drum and heat-exchanging tube bundle import and the connection tedge between heat-exchanging tube bundle outlet and drum.When high-temperature medium flows in housing, heat-exchanging tube bundle connects formation Natural Circulation with drum, and a part of heat of high-temperature medium is taken away by the cooling medium in heat-exchanging tube bundle, makes the heat energy of high-temperature medium make full use of, and the distance of high-temperature medium flowing and resistance are little, its droop loss is the least；Further, since heat-exchanging tube bundle is arranged in housing, heat-exchanging tube bundle can be with free wxpansion, it is to avoid the safety problem of heat-exchange system cracking.
Description
Technical field
The present invention relates to a kind of heat-exchange system, particularly relate to the combined type heat-exchange system in the heat recovery system used of the industries such as a kind of petrochemical industry, thermoelectricity electric power, metallurgy, Thermal Power Engineering, belong to high-temperature hot recovery system technical field.
Background technology
At present, generally using heat recovery system to recycle the heat energy of high-temperature medium in the industries such as petrochemical industry, thermoelectricity electric power, metallurgy, Thermal Power Engineering, the heat recovery system of this high-temperature medium typically uses separate unit or multiple stage heat exchanger.Use Heat Exchanger to reclaim high temperature heat, there is the advantage that high-temperature medium pipeline is few, occupation area of equipment is little, but there is the shortcoming that step comprehensive utilization is poor, recuperation of heat usefulness is relatively low of heat energy；Using multiple stage heat exchanger to reclaim high temperature heat and have the advantage that recuperation of heat usefulness is higher, but between multiple stage heat exchanger, the longer meeting of high-temperature pipe causes the pressure loss of high-temperature medium relatively greatly, and use multiple stage heat exchanger, floor space is big, increases cost of investment.
For improving the utilization ratio of high-temperature medium recuperation of heat, some patent documents disclose high-temperature medium heat reclamation device, if notification number is CN2557914Y, the Chinese utility model patent of entitled " a kind of high-temp. sensible heat recovery assembling type heat-exchanger " discloses a kind of unitized exchanger, it is low that this heat exchanger has high-temperature medium flow resistance, the advantage that occupation area of equipment is little, but the problem overcoming thermal expansion due to this heat exchanger expansion joint assembly, owing to expansion joint is a kind of consumable accessory, expansion joint is easy to accident occur after damaging, and this heat exchanger micro-fixed tube sheet shell and tube, the problem that swelling cracking the most easily occurs.And for example notification number is CN201159608Y, discloses a kind of Vertical Combination formula heat exchanger in the Chinese utility model patent of entitled " unitized exchanger ", this heat exchanger has the advantage that droop loss is little, good energy-conserving effect, floor space are little, but this equipment is simply to be combined by multiple stage heat exchanger, and the heat exchanger of combination also uses fixed tube sheet tubular heat exchanger, there is also the safety problem of easily cracking.
Summary of the invention
It is an object of the invention to provide a kind of combined type heat-exchange system, to solve the technical problem that heat exchanger droop loss is big, floor space big, easily security incident occurs in cracking in the high-temperature hot recovery system of prior art.
The present invention adopts the following technical scheme that a kind of combined type heat-exchange system, have high-temperature medium import including one end, the other end has the housing that high-temperature medium exports, it is provided with heat-exchanging tube bundle in described housing, described housing is externally provided with and the heat-exchanging tube bundle drum by pipeline communication, and described pipeline includes connection down-comer between drum and heat-exchanging tube bundle import and the connection tedge between heat-exchanging tube bundle outlet and drum.
The quantity at least two of described housing.
The quantity at least two of heat-exchanging tube bundle in described each housing, the direction that each heat-exchanging tube bundle in same housing flows along high-temperature medium is sequentially arranged.
The quantity at least two of described drum, each drum reduces successively along the direction temperature that high-temperature gas flows.
Described each heat-exchanging tube bundle is connected with corresponding drum by tedge and down-comer respectively, and the saturated media outlet in the later drum that temperature is relatively low has reheating pipe, and this reheating pipe passes from the previous drum that temperature is higher.
Connect with corresponding drum after described different housings is in the heat-exchanging tube bundle parallel connection of same position.
The drum that in described same housing, previous heat-exchanging tube bundle is connected and the inlet communication of later heat-exchanging tube bundle.
The inwall of described housing is provided with heat-barrier material.
Heat-exchanging tube bundle is arranged in housing by the present invention, heat-exchanging tube bundle is connected with drum by tedge and down-comer and forms Natural Circulation, in use, when high-temperature medium flows in housing, a part of heat of high-temperature medium is taken away by the medium in heat-exchanging tube bundle, the temperature making high-temperature medium reduces, and owing to distance and the resistance of high-temperature medium flowing are little, its droop loss is the least；Further, since heat-exchanging tube bundle is arranged in housing, heat-exchanging tube bundle can be with free wxpansion, it is to avoid the safety problem of heat-exchange system cracking.Simultaneously because heat-exchanging tube bundle connects with drum, during under the effect of Natural Circulation, the medium in heat-exchanging tube bundle enters drum, make the medium in drum be heated, finally give the thermal medium of different temperatures, different conditions, so that the heat energy of high-temperature medium is fully used.And due to the effect of drum, the medium in heat-exchanging tube bundle is in fluidized state, there is heat-transfer film system big, save heat exchange area.Therefore, the shell side of the combined type heat-exchange system of the present invention is short, high-temperature medium flow resistance and resistance is little, droop loss is little, is difficult to safety problem swelling cracking occur, and the heat energy of high-temperature medium can be fully utilized.
Further, arranging two or more housing, high-temperature medium can flow in two or more housings, enables the invention to reclaim the heat energy of multi-series high-temperature medium.
Further, arranging two or more heat-exchanging tube bundle in each housing, high temperature thermal medium, when housing fluid, transmits heat by multiple heat-exchanging tube bundles, makes the recovery utilization rate of high-temperature medium heat energy improve further.
Further, by arranging the drum of two or more different potential temperatures, the heat of high-temperature medium, when housing fluid, is delivered in the drum of corresponding potential temperature by heat-exchanging tube bundle, thus obtains the medium of different temperatures grade by high-temperature medium medium.
Further, the medium in the later drum that temperature is relatively low is passed from the previous drum that temperature is higher by reheating pipe, and the medium in later drum that so can be relatively low to temperature heats further, obtains the higher medium of temperature grade.
Further, connect with corresponding drum after different housings is in the heat-exchanging tube bundle parallel connection of same position, in the case of not increasing drum quantity, heat-exchanging tube bundle in different housings is connected with same drum, just can complete the recuperation of heat of multi-series high-temperature medium, thus save investment and the floor space of equipment.
Further, the drum that in same housing, previous heat-exchanging tube bundle is connected and the inlet communication of later heat-exchanging tube bundle, high-temperature medium is when flowing, so by later heat-exchanging tube bundle, the medium in previous drum can be heated further, obtain the higher medium of temperature grade, so that the recovery utilization rate of high-temperature medium heat energy improves further.
Further, the heat-barrier material that inner walls is arranged can avoid case material directly to contact high-temperature gas, it is possible to reduces the requirement of case material.
Accompanying drawing explanation
Fig. 1 is the system flow chart of the embodiment of the present invention 1；
Fig. 2 is the system flow chart of the embodiment of the present invention 2；
Fig. 3 is the system flow chart of the embodiment of the present invention 3.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1:
nullThe system flow of embodiments of the invention 1 is as shown in Figure 1，The combined type heat-exchange system of the present embodiment，Including one end, there is high-temperature medium import、The other end has the housing 1 of high-temperature medium outlet，The inwall of housing 1 is provided with heat-barrier material，Three heat-exchanging tube bundles 2 being sequentially distributed along high-temperature medium flow direction it are provided with in housing 1，Housing 1 is externally provided with two drums 3 connected by pipeline with heat-exchanging tube bundle 2，The temperature of first drum is higher than the temperature of second drum，It is provided with down-comer 41 between first drum and first heat-exchanging tube bundle import，It is provided with tedge 42 between first heat-exchanging tube bundle outlet and first drum，Thus first drum and first heat-exchanging tube bundle constitute first circulation，It is provided with down-comer 41 between second drum and the 3rd heat-exchanging tube bundle import，It is provided with tedge 42 between 3rd heat-exchanging tube bundle outlet and second drum，Thus second drum and the 3rd heat-exchanging tube bundle constitute first circulation，The import of first drum and second heat-exchanging tube bundle forms high pressure superheated steam by pipeline communication after second heat-exchanging tube bundle heat exchange.Second drum is also communicated with reheating pipe 43, and this reheating pipe 43 passes from first drum.
The combined type heat-exchange system of the present embodiment is in use, high-temperature medium flows in housing 1, the partial heat of high-temperature medium is taken away by the medium in heat-exchanging tube bundle 2, medium in first heat-exchanging tube bundle flows in first circulation, the heat finally making first drum medium increases, medium in first drum can also be entered in second heat-exchanging tube bundle by pipeline, and after second heat-exchanging tube bundle heat exchange, heat increases further；Medium in 3rd heat-exchanging tube bundle second circulation in flow, make the heat of second drum medium increase, the medium in second drum can also pass through reheating pipe in first drum after heat exchange heat increase further.
nullThe present embodiment can be used for reclaiming the high-temperature gas of synthesis ammonia two process transform outlet of still，When reclaiming the heat of this high-temperature gas，Medium in drum is steam，It is 2.0 ~ 4.0MPa that this high-temperature gas enters the pressure before housing、Temperature is 700 ~ 1000 DEG C，When high-temperature gas flows in housing，High-temperature gas respectively with the media for heat exchange in each heat-exchanging tube bundle and drum，Medium in first drum be pressure be the high-pressure saturated steam of 8.0 ~ 10MPa，Medium in second drum be pressure be in 4.0 ~ 6.0MPa pressure saturated vapor，High temperature saturated vapor in first drum obtains high pressure superheated steam after second heat-exchanging tube bundle heat exchange，Have enough to eat and wear in second drum and steam product pass through reheating pipe to obtain pressure being 4.0MPa in first drum after heat exchange、Temperature is to press through vapours in 275 ~ 325 DEG C.After heat exchange, the temperature of the high-temperature gas discharged from high-temperature medium exit can be down to 300 ~ 380 DEG C, and droop loss is less than 25KPa.
The present embodiment uses based on Natural Circulation, the heat exchange mode of boiling heat transfer, this mode makes the good effect of heat exchange of high-temperature medium, high to the recovery utilization rate of high-temperature medium heat energy, and after heat exchange high-temperature medium to obtain droop loss little, additionally, housing does not interferes with the expansion of heat exchange pipeline, there is not the safety problem caused that easily ftractures, and can also obtain different temperatures and the accessory substance such as the saturated vapor of pressure rating and superheated steam.The High Temperature Gas heat recovery system of the present embodiment, for traditional high pressure gives up pot, steam superheater, middle pressure pot destroying process, reduces the energy consumption of system and the investment of equipment.
Embodiment 2:
nullThe system flow of embodiments of the invention 2 is as shown in Figure 2，The combined type heat-exchange system of the present embodiment，Including one end, there is high-temperature medium import、The other end has the housing 1 of high-temperature medium outlet，The quantity of the present embodiment middle shell 1 is two，It is applicable to reclaim the heat of multi-series high-temperature medium，It is equipped with heat-barrier material on the inwall of each housing 1，Three heat-exchanging tube bundles 2 being sequentially distributed along high-temperature medium flow direction it are equipped with in each housing 1，Housing 1 is externally provided with three drums 3 connected by pipeline with heat-exchanging tube bundle 2，The temperature of first drum is higher than the temperature of second drum，The temperature of second drum is higher than the temperature of the 3rd drum，Connect with corresponding drum 3 after different housings 1 is in heat-exchanging tube bundle 2 parallel connection of same position，Connected with corresponding drum by tedge 42 after the outlet parallel connection of heat-exchanging tube bundle corresponding in the most each housing，Connected with corresponding drum by down-comer 41 after the inlet parallel of heat-exchanging tube bundle corresponding in each housing，First heat-exchanging tube bundle after first drum is in parallel with each housing constitutes first circulation，Second heat-exchanging tube bundle after second drum is in parallel with each housing constitutes second circulation，The 3rd heat-exchanging tube bundle after 3rd drum is in parallel with each housing constitutes the 3rd circulation，Reheating pipe 43 all it is communicated with on second drum and the 3rd drum，The reheating pipe 43 that second drum is connected passes from first drum，3rd reheating pipe that drum is connected 43 passes from second drum.
The combined type heat-exchange system of the present embodiment is in use, high-temperature medium flows in housing, the partial heat of high-temperature medium is taken away by the medium in heat-exchanging tube bundle, medium in first heat-exchanging tube bundle flows in first circulation, the heat finally making first drum medium increases, medium in second heat-exchanging tube bundle flows in second circulation, the heat finally making second drum medium increases, medium in 3rd heat-exchanging tube bundle flows in the 3rd circulation, the heat finally making the 3rd drum medium increases, medium in second drum can also by reheating pipe in first drum after heat exchange heat increase further, medium in 3rd drum can also by reheating pipe in second drum after heat exchange heat increase further.
nullThe present embodiment can be used for reclaiming the heat of low-voltage high-temperature hydrocarbon medium，When reclaiming this high temperature hydrocarbon medium，Medium in the first two drum is steam，Medium in 3rd drum is methanol steam，It is 0.1 ~ 1.0MPa that this high temperature hydrocarbon medium enters the pressure before housing、Temperature is 450 ~ 600 DEG C，High temperature hydrocarbon medium respectively with the media for heat exchange in each heat-exchanging tube bundle and drum，Medium in first drum be pressure be 8.0 ~ 12.5MPa、Temperature is the high temperature saturated vapor of 295 ~ 330 DEG C，Medium in second drum be pressure be 2.0 ~ 2.5MPa、Temperature is the middle temperature saturated vapor of 215 ~ 225 DEG C，Medium in 3rd drum is methyl alcohol saturated vapor，Have enough to eat and wear in second drum and steam product pass through reheating pipe to obtain pressure being 2.0 ~ 2.5MPa in first drum after heat exchange、Temperature is the middle temperature superheated steam of 250 ~ 300 DEG C，Methyl alcohol saturated vapor in 3rd drum obtains temperature by reheating pipe in second drum after heat exchange be 160 ~ 200 DEG C of methyl alcohol superheated steams.After heat exchange, the temperature of the high temperature hydrocarbon medium discharged from high-temperature medium exit can be down to 160 ~ 200 DEG C, and droop loss is at 5 ~ 10KPa.
The present embodiment uses based on Natural Circulation, the heat exchange mode of boiling heat transfer, this mode makes the good effect of heat exchange of high-temperature medium, high to the recovery utilization rate of high-temperature medium heat energy, and after heat exchange high-temperature medium to obtain droop loss little, additionally, housing does not interferes with the expansion of heat exchange pipeline, there is not the safety problem caused that easily ftractures, and can also obtain different temperatures and the accessory substance such as the saturated vapor of pressure rating and superheated steam.The High Temperature Gas heat recovery system of the present embodiment, due to different housings is in after the heat-exchanging tube bundle parallel connection of same position with corresponding drum connection, need not increase drum quantity and just can complete the recuperation of heat of multi-series high-temperature medium, thus decrease the quantity of equipment, reduce the energy consumption of system, save investment and the floor space of equipment compared with traditional heat recovery system.
Embodiment 3:
The system flow of embodiments of the invention 3 is as shown in Figure 3, unlike the embodiment of the present invention 2, the quantity of the present embodiment middle shell is one, it is adaptable to reclaim the heat of single series high-temperature medium, other structure of the present embodiment is the most same as in Example 3, and here is omitted.
In the same manner as in Example 2, the present embodiment is in use, high-temperature medium flows in housing, the partial heat of high-temperature medium is taken away by the medium in heat-exchanging tube bundle, medium in first heat-exchanging tube bundle flows in first circulation, the heat increase finally making first drum medium obtains high temperature saturated media, medium in second heat-exchanging tube bundle flows in second circulation, the heat increase finally making second drum medium obtains middle temperature saturated media, medium in 3rd heat-exchanging tube bundle flows in the 3rd circulation, the heat increase finally making the 3rd drum medium obtains low temperature saturated media.Middle temperature saturated media product in second drum can also by reheating pipe in first drum after heat exchange heat increase further, obtain middle temperature mistake thermal medium product；Low temperature saturated media product in 3rd drum can also by reheating pipe in second drum after heat exchange heat increase further, obtain cryogenic overheating medium.The present embodiment makes the good effect of heat exchange of high-temperature medium, high to the recovery utilization rate of high-temperature medium heat energy, and after heat exchange high-temperature medium to obtain droop loss little, additionally, housing does not interferes with the expansion of heat exchange pipeline, there is not the safety problem caused that easily ftractures, and different temperatures and the accessory substance such as the saturated vapor of pressure rating and superheated steam can also be obtained.
Above-described embodiment is the preferred embodiment of the invention, and in other embodiments of the invention, the quantity of drum can be selected according to actual needs, and the quantity of drum can be one, it is also possible to is two or more.
In other embodiments of the invention, the medium in drum both can be water vapour, it is also possible to be the steam of other gas of methyl alcohol.
In other embodiments of the invention, in housing, the quantity of heat-exchanging tube bundle can be selected according to actual needs, and it can also be two that the quantity of heat-exchanging tube bundle can be one, it is also possible to be more than three.
In other embodiments of the invention, the quantity of housing can be selected according to actual needs, and the quantity of housing can be two or more.
Claims (6)
1. a combined type heat-exchange system, it is characterized in that: it includes that one end has high-temperature medium import, the other end has the housing (1) of high-temperature medium outlet, heat-exchanging tube bundle (2) it is provided with in described housing (1), described housing (1) is externally provided with and the heat-exchanging tube bundle (2) drum (3) by pipeline communication, described pipeline includes connection down-comer (41) between drum (3) and heat-exchanging tube bundle (2) import and the connection tedge (42) between heat-exchanging tube bundle (2) outlet and drum (3), the quantity at least two of heat-exchanging tube bundle (2) in same described housing, the direction that each heat-exchanging tube bundle (2) in same housing flows along high-temperature medium is sequentially arranged, the quantity at least two of described drum (3), each drum reduces successively along the direction temperature that high-temperature gas flows；Along high-temperature gas flowing direction, first heat-exchanging tube bundle and first drum in housing (1) form first circulation, and last heat-exchanging tube bundle in housing (1) forms second circulation with last drum.
A kind of combined type heat-exchange system the most according to claim 1, it is characterised in that: the quantity at least two of described housing (1).
A kind of combined type heat-exchange system the most according to claim 1, it is characterized in that: described each heat-exchanging tube bundle (2) is connected with corresponding drum (3) by tedge (42) and down-comer (41) respectively, saturated media outlet in the later drum that temperature is relatively low has reheating pipe (43), this reheating pipe (43) to pass from the previous drum that temperature is higher.
A kind of combined type heat-exchange system the most according to claim 2, it is characterised in that: connect with corresponding drum (3) after different described housings (1) are in heat-exchanging tube bundle (2) parallel connection of same position.
A kind of combined type heat-exchange system the most according to claim 1, it is characterised in that: the drum (3) that in described same housing (1), previous heat-exchanging tube bundle is connected and the inlet communication of later heat-exchanging tube bundle.
A kind of combined type heat-exchange system the most according to claim 1, it is characterised in that: the inwall of described housing (1) is provided with heat-barrier material.
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| CN201410167320.6A CN103925814B (en) | 2014-04-24 | 2014-04-24 | A kind of combined type heat-exchange system |
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| CN201410167320.6A CN103925814B (en) | 2014-04-24 | 2014-04-24 | A kind of combined type heat-exchange system |
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| CN103925814A CN103925814A (en) | 2014-07-16 |
| CN103925814B true CN103925814B (en) | 2016-09-07 |
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| CN117346564B (en) * | 2023-12-05 | 2024-02-23 | 安徽普泛能源技术有限公司 | Composite heat exchanger and carbon capture pressure increasing system thereof |
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| CN201819201U (en) * | 2010-10-13 | 2011-05-04 | 广东开能环保能源有限公司 | Glass furnace pure low-temperature waste heat generating system |
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