CN107120869A - Petrochemical plant low temperature exhaust heat recycling system and method based on absorption heat exchange - Google Patents
Petrochemical plant low temperature exhaust heat recycling system and method based on absorption heat exchange Download PDFInfo
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- CN107120869A CN107120869A CN201710475902.4A CN201710475902A CN107120869A CN 107120869 A CN107120869 A CN 107120869A CN 201710475902 A CN201710475902 A CN 201710475902A CN 107120869 A CN107120869 A CN 107120869A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
Disclose a kind of petrochemical plant low temperature exhaust heat recycling system and method based on absorption heat exchange, the system includes absorption type heat pump group part (1,2,3,4), solution pump (6), cryogenic fluid pump (7), heat exchanger (5) and corresponding connecting line, lateral line (8), secondary lateral line (9) and three lateral lines (10), and a lateral line (8) is configured as allowing have the first low-temperature material of middle-low temperature heat successively in evaporator (1) and in generator (3) as driving heat source in petrochemical plant；The second low-temperature material that secondary lateral line (9) is configured as allowing petrochemical plant domestic demand to preheat condenses the heat produced and pre-heating temperature elevation by the low pressure working fluid steam in absorptive condenser (4)；The 3rd low-temperature material that three lateral lines (10) are configured as allowing petrochemical plant domestic demand to preheat by absorb the dense absorbent solution in absorber (2) mixed with high-pressure working medium steam generation high temperature heat and pre-heating temperature elevation.
Description
Technical field
The present invention relates to the recycling of petrochemical plant low temperature exhaust heat, and in particular to a kind of petrochemical plant based on absorption heat exchange
Low temperature exhaust heat recycling system and method.
Technical background
Petroleum chemical industry residual heat resources account for the 17%~67% of its fuel consumption total amount, the waste heat money of recoverable
Source is about the 60% of waste heat total resources.The waste heat species of petroleum chemical industry is more, mainly has product waste heat, more than recirculated cooling water
Heat and fume afterheat etc..The waste heat of petrochemical industry can be divided into following a few classes by its grade：1) high-grade waste heat, temperature range is big
About at 150~350 DEG C；2) compared with high-grade waste heat, temperature range is about at 70~150 DEG C；3) low grade residual heat, temperature range is big
About at 30~70 DEG C.
At present, by energy-saving and emission-reduction work for many years development and its auxiliary construction of corresponding engineering, the height of petroleum chemical enterprise
The recycling that grade waste heat and the middle grade waste heat of the overwhelming majority have been substantially achieved.Low-grade waste heat is huge because of remaining heat
Greatly, recovery difficult is big, lacks effective economic recovery and utilizes technology, and fails to be recycled utilization, can only pass through circulating cooling
Tower is discharged into environment.For example, 70 DEG C of petrochemical plant stabilizer bottom gasoline needs water cooling to 40 DEG C, and partial material is needed by 30 DEG C
It is preheated to 40 DEG C, is preheated to 90 DEG C by 50 DEG C, because this partial material amount is very big, therefore preheating this partial material needs consumption big
Measure gas or low-pressure steam.Therefore, how low temperature exhaust heat is further reclaimed, realizes the profit step by step of residual heat resources in petrochemical plant
With realizing effects of energy saving and emission reduction, be significant.
The content of the invention
In one aspect of the invention system is recycled there is provided a kind of petrochemical plant low temperature exhaust heat based on absorption heat exchange
System, including absorption type heat pump group part 1,2,3 and 4, solution pump 6, cryogenic fluid pump 7, heat exchanger 5 and corresponding connecting line, it is described
Absorption type heat pump group part includes evaporator 1, absorber 2, generator 3 and condenser 4, wherein, the system also includes thermal source material
Lateral line 8, needs the secondary lateral line 9 of preheating material and needs three lateral lines 10 of preheating material, wherein,
Described lateral line 8 of thermal source material sequentially passes through the evaporator 1 and the generator 3, and is configured as permitting
Perhaps the first low-temperature material with middle-low temperature heat is made in the evaporator 1 and in the generator 3 successively in petrochemical plant
For driving heat source；
It is described to need the secondary lateral line 9 of preheating material to pass through the condenser 4, and be configured as allowing petrochemical plant domestic demand to preheat
The second low-temperature material by absorb the low pressure working fluid steam in the condenser 4 condensation produce heat and pre-heating temperature elevation, so
It is transported to afterwards in the second process pipeline of petrochemical plant；
It is described to need three lateral lines 10 of preheating material to pass through the absorber 2, and be configured as allowing petrochemical plant domestic demand pre-
3rd low-temperature material of heat is mixed in generation by absorbing the dense absorbent solution in the absorber 2 with high-pressure working medium steam
The heat of high temperature and pre-heating temperature elevation, are then delivered in the 3rd process pipeline of petrochemical plant；
The evaporator 1 is configured as allowing working-medium water therein to absorb as described the first of driving heat source by evaporating
The heat of low-temperature material, and the high-pressure working medium steam is evaporated to, and enter in the absorber 2；
The absorber 2 is configured as allowing dense absorbent solution therein to mix with the high-pressure working medium steam in generation
The heat of high temperature, thus preheat it is described need the 3rd low-temperature material in three lateral lines 10 of preheating material, and allow dilution
Absorbent solution the generator 3 is transported to by the heat exchanger 5；
The generator 3 is configured as allowing first low-temperature material in described lateral line 8 of thermal source material to make
The absorbent solution of the dilution is heated for driving heat source, low pressure working fluid steam and dense absorbent solution is formed, and allow described
Low pressure working fluid steam is transported in the condenser 4；
The solution pump 6 is configured as the dense absorbent solution in the generator 3 is defeated by the exchanger 5
It is sent to the absorber 2；
The heat exchanger 5 is configured as inhaling in the dense absorbent solution conveyed by the generator 3 and by described
Receive heat-shift between the absorbent solution for the dilution that device 2 is conveyed；
The condenser 4 is configured as allowing the low pressure working fluid steam from the generator 3 to need preheating by described
Second low-temperature material cooling in the secondary lateral line 9 of material, so as to be condensed into working-medium water, while by the second low temperature thing
Expect pre-heating temperature elevation；And
The cryogenic fluid pump 7 is configured as the working-medium water in the condenser 4 being transported in the evaporator 1.
In another aspect of the present invention, there is provided a kind of petrochemical plant low temperature exhaust heat recycling based on absorption heat exchange
Method, methods described is used for the petrochemical plant low temperature exhaust heat recycling system based on absorption heat exchange, and the system includes absorbing
Formula heat pump components 1,2,3 and 4, solution pump 6, cryogenic fluid pump 7, heat exchanger 5 and corresponding connecting line, the absorption type heat pump group
Part includes evaporator 1, absorber 2, generator 3 and condenser 4, and the system also includes lateral line 8 of thermal source material, needs pre-
The secondary lateral line 9 of thermal material and need three lateral lines 10 of preheating material, described lateral line 8 of thermal source material sequentially passes through described
Evaporator 1 and the generator 3, it is described to need the secondary lateral line 9 of preheating material to pass through the condenser 4, it is described to need preheating material
Three times lateral line 10 passes through the absorber 2, and methods described includes：
The first low-temperature material with middle-low temperature heat in petrochemical plant is allowed to enter described lateral line 8 of thermal source material,
And it is used as driving heat source in the evaporator 1 so that the working-medium water in the evaporator 1 is low by evaporating absorption described first
The heat of warm material, and high-pressure working medium steam is evaporated to, and enter in the absorber 2；
Allow the 3rd low-temperature material that petrochemical plant domestic demand is preheated to need three lateral lines 10 of preheating material into described, and allow
Dense absorbent solution in the absorber 2 mixes the heat for producing high temperature with the high-pressure working medium steam, so as to preheat institute
The 3rd low-temperature material is stated, is then delivered in the 3rd process pipeline of petrochemical plant, and allows the absorbent solution of dilution to pass through institute
State heat exchanger 5 and be transported to the generator 3；
Allow first low-temperature material in described lateral line 8 of thermal source material in the generator 3 as drive
Dynamic thermal source heats the absorbent solution of the dilution, forms low pressure working fluid steam and dense absorbent solution, it is allowed to the low pressure work
Matter steam is transported in the condenser 4；
The dense absorbent solution in the generator 3 is transported to institute by the exchanger 5 by the solution pump 6
State absorber 2；
By the heat exchanger 5 in the dense absorbent solution conveyed by the generator 3 and defeated by the absorber 2
Heat-shift between the absorbent solution for the dilution sent；
Allow the second low-temperature material that petrochemical plant domestic demand is preheated to need the secondary lateral line 9 of preheating material into described, and pass through
Heat and pre-heating temperature elevation that the low pressure working fluid steam condensation in the condenser 4 produces are absorbed, the of petrochemical plant is then delivered to
In two process pipelines, and the low pressure working fluid steam is caused to be condensed into working-medium water；And
The working-medium water in the condenser 4 is transported in the evaporator 1 by the cryogenic fluid pump 7.
The advantage of technical scheme includes：It make use of more than the low temperature that prior art is difficult by petrochemical industry
Heat, using the material that the material of cooling is preheated as driving heat source, needs is needed in petrochemical plant as low-temperature heat source, so as to reduce
The original pre- thermal energy consumption of petrochemical plant is even substituted, the gradient step by step for realizing the energy in petrochemical plant is utilized.
Brief description of the drawings
Fig. 1 is the petrochemical plant low temperature exhaust heat recycling system based on absorption heat exchange according to embodiments of the invention
Structural representation；And
Fig. 2 is the petrochemical plant low temperature exhaust heat recoverying and utilizing method based on absorption heat exchange according to embodiments of the invention
Flow chart.
Embodiment
Embodiments of the invention are described in detail with reference to the accompanying drawings.In the following description, many details are elaborated
To make person of ordinary skill in the field that the present invention is appreciated more fully.But, for the technology in art
Personnel are it is evident that the present invention's realizes some that can not have in these details.However, it should be understood that this hair
It is bright to be not limited to introduced specific embodiment.Conversely, it may be considered that implemented with any combination of following feature and key element
The present invention, regardless of whether whether they are related to different embodiments.Therefore, aspect, feature, embodiment and advantage below is only said
Bright be used and key element or the restriction for being not construed as claim, unless clearly proposed in the claims.
Referring now to Fig. 1, it is to be reclaimed according to the petrochemical plant low temperature exhaust heat based on absorption heat exchange of embodiments of the invention
Utilize the structural representation of system 100.As shown in fig. 1, the petrochemical plant low temperature exhaust heat recycling system 100 includes absorption
Heat pump components 1,2,3 and 4, solution pump 6, cryogenic fluid pump 7, heat exchanger 5 and corresponding connecting line, the absorption type heat pump group part
Including evaporator 1, absorber 2, generator 3 and condenser 4, wherein, the system 100 also includes lateral line 8 of thermal source material,
Need the secondary lateral line 9 of preheating material and need three lateral lines 10 of preheating material, wherein,
Described lateral line 8 of thermal source material sequentially passes through the evaporator 1 and the generator 3, and is configured as permitting
Perhaps the first low-temperature material with middle-low temperature heat is made in the evaporator 1 and in the generator 3 successively in petrochemical plant
For driving heat source；
It is described to need the secondary lateral line 9 of preheating material to pass through the condenser 4, and be configured as allowing petrochemical plant domestic demand to preheat
The second low-temperature material by absorb the low pressure working fluid steam in the condenser 4 condensation produce heat and pre-heating temperature elevation, so
It is transported to afterwards in the second process pipeline of petrochemical plant；
It is described to need three lateral lines 10 of preheating material to pass through the absorber 2, and be configured as allowing petrochemical plant domestic demand pre-
3rd low-temperature material of heat is mixed in generation by absorbing the dense absorbent solution in the absorber 2 with high-pressure working medium steam
The heat of high temperature and pre-heating temperature elevation, are then delivered in the 3rd process pipeline of petrochemical plant；
The evaporator 1 is configured as allowing working-medium water therein to absorb as described the first of driving heat source by evaporating
The heat of low-temperature material, and the high-pressure working medium steam is evaporated to, and enter in the absorber 2；
The absorber 2 is configured as allowing dense absorbent solution therein to mix with the high-pressure working medium steam in generation
The heat of high temperature, thus preheat it is described need the 3rd low-temperature material in three lateral lines 10 of preheating material, and allow dilution
Absorbent solution the generator 3 is transported to by the heat exchanger 5；
The generator 3 is configured as allowing first low-temperature material in described lateral line 8 of thermal source material to make
The absorbent solution of the dilution is heated for driving heat source, low pressure working fluid steam and dense absorbent solution is formed, and allow described
Low pressure working fluid steam is transported in the condenser 4；
The solution pump 6 is configured as the dense absorbent solution in the generator 3 is defeated by the exchanger 5
It is sent to the absorber 2；
The heat exchanger 5 is configured as inhaling in the dense absorbent solution conveyed by the generator 3 and by described
Receive heat-shift between the absorbent solution for the dilution that device 2 is conveyed；
The condenser 4 is configured as allowing the low pressure working fluid steam from the generator 3 to need preheating by described
Second low-temperature material cooling in the secondary lateral line 9 of material, so as to be condensed into working-medium water, while by the second low temperature thing
Expect pre-heating temperature elevation；
The cryogenic fluid pump 7 is configured as the working-medium water in the condenser 4 being transported in the evaporator 1.
In certain embodiments, the absorption type heat pump group part 1,2,3 and 4 for example can be temperature-boosting absorption heat pump group
Part.
In certain embodiments, the absorption type heat pump group part 1,2,3 and 4 can also include the solution pump 6, cryogenic fluid pump
7th, heat exchanger 5 and corresponding connecting line.
In certain embodiments, described each absorption type heat pump group part 1,2,3 and 4 etc. can be included in an absorption heat pump
In.Certainly, the absorption heat pump can also include miscellaneous part.
In certain embodiments, the absorbent can be lithium-bromide solution.In other embodiments, the absorbent can
Other absorbents are thought, such as ammoniacal liquor.
First low-temperature material can be any low temperature or middle material with waste heat in petrochemical plant, such as such as water,
The liquid or gas of the low temperature such as oil gas, gasoline, diesel oil or middle temperature.
In certain embodiments, first low-temperature material is entering the primary side of lateral line 8 of thermal source material
Temperature during thermal material entrance (into before the evaporator 1) is 70 DEG C or so, such as 65-75 DEG C, or 60-80 DEG C,
And when leaving the primary side material outlet of described lateral line 8 of thermal source material (leave the generator 3 after)
Temperature be 40 DEG C or so, such as 35-50 DEG C, or 30-50 DEG C.Leave the primary side material outlet described first is low
Warm material can be discharged, or can be input in the process pipeline of petrochemical plant and further utilized.According to the reality of the present invention
Apply the system 100 of example by using prior art be difficult with thus go out of use, the low temperature in petrochemical plant with waste heat
Or middle temperature material is as driving heat source, to preheat the material that other need to preheat, without consuming substantial amounts of gas or low pressure
The thermals source such as steam have saved mass energy as driving heat source, reduce carbon emission.
Second low-temperature material can be any required low-temperature material for being preheating to medium and low temperature in petrochemical plant, such as all
Such as liquid or gas of water, oil gas, gasoline, diesel oil low temperature or middle temperature.
In certain embodiments, second low-temperature material is needing the secondary of the secondary lateral line 9 of preheating material into described
Temperature during the preheating material entrance of side (into before the condenser 4) is 30 DEG C or so, such as 25-35 DEG C, or 20-40
DEG C, and (leave the condenser leaving when the secondary side preheating material for needing the secondary lateral line 9 of preheating material is exported
After 4) temperature be 45 DEG C or so, such as 40-50 DEG C, or 35-55 DEG C.System described according to an embodiment of the invention
100 are used as the condensing agent of the condenser 4 by the low-temperature material that need to will be preheated, not only using waste heat to needing preheating in petrochemical plant
Low-temperature material carried out appropriate preheating, meet technological requirement, and while guarantee system is correctly run, it is not necessary to use
Special cooling water and cooling tower etc. to provide condensing agent for condenser 4, have saved the energy and capital.
3rd low-temperature material can be any required low-temperature material for being preheating to high temperature degree in petrochemical plant, such as all
Such as liquid or gas of water, oil gas, gasoline, diesel oil low temperature or middle temperature.
In certain embodiments, the 3rd low-temperature material is pre- into three sides for needing three lateral lines 10 of preheating material
Temperature during thermal material entrance (into before the absorber 2) is 50 DEG C or so, such as 45-55 DEG C, or 40-60 DEG C,
And leave it is described need three side preheating materials outlets of three lateral lines 10 of preheating material when (leave the absorber 2
Temperature afterwards) is 90 DEG C or so, such as 85-95 DEG C or so, or 80-100 DEG C.System described according to an embodiment of the invention
The low-temperature material that need to be preheated is heated to higher temperatures by system 100 by using the heat of the low-temperature material with waste heat in petrochemical plant
Degree, the energy has been saved while technological requirement is met.
The petrochemical plant low temperature exhaust heat according to an embodiment of the invention based on absorption heat exchange is described above by reference to accompanying drawing
Recycling system, it is noted that above description and diagram are merely illustrative, rather than limitation of the present invention.In the present invention
Other embodiment in, the system can have connection between more, less or different part, and each part, include and work(
Energy relation can be with described and diagram difference.For example, generally multiple parts can be merged into a big part.Example again
Such as, the title of each part not limitation of the present invention.
Referring now to Fig. 2, it is a kind of petrochemical plant low temperature exhaust heat based on absorption heat exchange according to embodiments of the invention
The indicative flowchart of recoverying and utilizing method, methods described is used for the petrochemical plant low temperature exhaust heat based on absorption heat exchange and recycled
System (such as above-mentioned system 100 according to an embodiment of the invention), the system include absorption type heat pump group part 1,2,3 and 4,
Solution pump 6, cryogenic fluid pump 7, heat exchanger 5 and corresponding connecting line, the absorption type heat pump group part include evaporator 1, absorbed
Device 2, generator 3 and condenser 4, the system also include lateral line 8 of thermal source material, need the secondary lateral line 9 of preheating material
With need three lateral lines 10 of preheating material, described lateral line 8 of thermal source material sequentially passes through the evaporator 1 and described occurred
Device 3, it is described to need the secondary lateral line 9 of preheating material to pass through the condenser 4, it is described to need three lateral lines 10 of preheating material to pass through institute
State absorber 2), it the described method comprises the following steps：
In step 201, it is allowed to which the first low-temperature material with middle-low temperature heat enters the thermal source material one in petrochemical plant
Secondary lateral line 8, and it is used as driving heat source in the evaporator 1 so that the working-medium water in the evaporator 1 is absorbed by evaporating
The heat of first low-temperature material, and high-pressure working medium steam is evaporated to, and enter in the absorber 2；
In step 202, it is allowed to which the 3rd low-temperature material of petrochemical plant domestic demand preheating needs three side pipes of preheating material into described
Road 10, and allow the dense absorbent solution in the absorber 2 to mix the heat for producing high temperature with the high-pressure working medium steam,
So as to preheat the 3rd low-temperature material, it is then delivered in the 3rd process pipeline of petrochemical plant, and allows the absorbent of dilution
Solution is transported to the generator 3 by the heat exchanger 5；
In step 203, it is allowed to which first low-temperature material in described lateral line 8 of thermal source material is in the generator
The absorbent solution of the dilution is heated in 3 as driving heat source, low pressure working fluid steam and dense absorbent solution is formed, it is allowed to institute
Low pressure working fluid steam is stated to be transported in the condenser 4；
In step 204, the dense absorbent solution in the generator 3 is exchanged by described by the solution pump 6
Device 5 is transported to the absorber 2；
In step 205, by the heat exchanger 5 in the dense absorbent solution conveyed by the generator 3 and by institute
Heat-shift between the absorbent solution for the dilution for stating the conveying of absorber 2；
In step 206, it is allowed to which the second low-temperature material of petrochemical plant domestic demand preheating needs the secondary side pipe of preheating material into described
Road 9, and by absorb the low pressure working fluid steam in the condenser 4 condensation produce heat and pre-heating temperature elevation, be then delivered to
In second process pipeline of petrochemical plant, and the low pressure working fluid steam is caused to be condensed into working-medium water；
In step 207, the working-medium water in the condenser 4 is transported in the evaporator 1 by the cryogenic fluid pump 7.
In certain embodiments, first low-temperature material in described lateral line 8 of thermal source material is entering described
Temperature during evaporator 1 is 60-80 DEG C, and the temperature when leaving the generator 3 is 30-50 DEG C；
Temperature of second low-temperature material needed in the secondary lateral line 9 of preheating material when entering the condenser 4
Spend for 20-40 DEG C, the temperature when leaving the condenser 4 is 35-55 DEG C；And
Temperature of the 3rd low-temperature material needed in three lateral lines 10 of preheating material when entering the absorber 2
Spend for 40-60 DEG C, the temperature when leaving the absorber 2 is 80-100 DEG C.
Petrochemical plant low temperature exhaust heat recoverying and utilizing method according to an embodiment of the invention is described above by reference to accompanying drawing, should be referred to
Go out, above description and diagram are merely illustrative, rather than limitation of the present invention.In other embodiments of the invention, should
Method can have order between more, less or different step, and each step, include and functional relationship can with it is described
With the difference of diagram.
The present invention is directed to the characteristic distributions and waste heat grade of residual heat resources in petrochemical industry technological process, it is proposed that Yi Zhonghe
Utilize the technical scheme of the low temperature exhaust heat material of petrochemical plant with managing gradient.The advantage of technical scheme includes：It make use of
The low temperature exhaust heat that prior art is difficult by petrochemical industry, using needed in petrochemical plant cooling material as driving heat source,
The material of preheating is needed as low-temperature heat source, so as to reduce or even substitute the original pre- thermal energy consumption of petrochemical plant, is realized in petrochemical plant
The gradient step by step of the energy is utilized.
It should be noted that technical scheme is not limited to petrochemical industry, other industrial materials are can also be applied to pre-
Thermal cycle, is reclaimed for low temperature exhaust heat and utilization provides new direction.
Although the present invention is disclosed as above by embodiment, the present invention is not limited to this.Those skilled in the art
The various changes made without departing from the spirit and scope of the present invention and modification, all should include protection scope of the present invention, this
The protection domain of invention is only defined by the language of claim and its language limited range of equal value.
Claims (4)
1. a kind of petrochemical plant low temperature exhaust heat recycling system based on absorption heat exchange, including absorption type heat pump group part (1,2,
3rd, 4), solution pump (6), cryogenic fluid pump (7), heat exchanger (5) and corresponding connecting line, the absorption type heat pump group part includes steaming
Device (1), absorber (2), generator (3) and condenser (4) are sent out, wherein, the system also includes lateral line of thermal source material
(8), need the secondary lateral line of preheating material (9) and need three lateral lines (10) of preheating material, wherein,
Described lateral line (8) of thermal source material sequentially passes through the evaporator (1) and the generator (3), and is configured as
Allow interior the first low-temperature material with middle-low temperature heat of petrochemical plant successively in the evaporator (1) and in the generator
(3) driving heat source is used as in；
It is described to need the secondary lateral line of preheating material (9) to pass through the condenser (4), and be configured as allowing petrochemical plant domestic demand to preheat
The second low-temperature material by absorb the low pressure working fluid steam in the condenser (4) condensation produce heat and pre-heating temperature elevation,
It is then delivered in the second process pipeline of petrochemical plant；
It is described to need three lateral lines (10) of preheating material to pass through the absorber (2), and be configured as allowing petrochemical plant domestic demand pre-
3rd low-temperature material of heat mixes what is produced with high-pressure working medium steam by absorbing the dense absorbent solution in the absorber (2)
The heat of high temperature and pre-heating temperature elevation, are then delivered in the 3rd process pipeline of petrochemical plant；
The evaporator (1) is configured as allowing working-medium water therein to be absorbed by evaporating as the described first low of driving heat source
The heat of warm material, and the high-pressure working medium steam is evaporated to, and enter in the absorber (2)；
The absorber (2) is configured as allowing dense absorbent solution therein to mix height in generation with the high-pressure working medium steam
The heat of temperature, thus preheat it is described need the 3rd low-temperature material in three lateral lines (10) of preheating material, and allow dilution
Absorbent solution the generator (3) is transported to by the heat exchanger (5)；
The generator (3) is configured as allowing first low-temperature material in described lateral line (8) of thermal source material to make
The absorbent solution of the dilution is heated for driving heat source, low pressure working fluid steam and dense absorbent solution is formed, and allow described
Low pressure working fluid steam is transported in the condenser (4)；
The solution pump (6) is configured as the dense absorbent solution in the generator (3) passing through the exchanger (5)
It is transported to the absorber (2)；
The heat exchanger (5) is configured as inhaling in the dense absorbent solution conveyed by the generator (3) and by described
Heat-shift between the absorbent solution for the dilution for receiving device (2) conveying；
The condenser (4) is configured as allowing the low pressure working fluid steam from the generator (3) to need preheating by described
Second low-temperature material cooling in the secondary lateral line of material (9), so as to be condensed into working-medium water, while by second low temperature
Material pre-heating temperature elevation；And
The cryogenic fluid pump (7) is configured as the working-medium water in the condenser (4) being transported in the evaporator (1).
2. system according to claim 1, wherein,
Temperature of first low-temperature material when entering the evaporator (1) in described lateral line (8) of thermal source material
For 60-80 DEG C, the temperature when leaving the generator (3) is 30-50 DEG C；
Temperature of second low-temperature material needed in the secondary lateral line of preheating material (9) when entering the condenser (4)
Spend for 20-40 DEG C, the temperature when leaving the condenser (4) is 35-55 DEG C；And
Temperature of the 3rd low-temperature material needed in three lateral lines (10) of preheating material when entering the absorber (2)
Spend for 40-60 DEG C, the temperature when leaving the absorber (2) is 80-100 DEG C.
3. a kind of petrochemical plant low temperature exhaust heat recoverying and utilizing method based on absorption heat exchange, methods described is used to change based on absorption
Heat petrochemical plant low temperature exhaust heat recycling system, the system include absorption type heat pump group part (1,2,3,4), solution pump (6),
Cryogenic fluid pump (7), heat exchanger (5) and corresponding connecting line, the absorption type heat pump group part include evaporator (1), absorber
(2), generator (3) and condenser (4), the system also include lateral line (8) of thermal source material, need preheating material secondary side
Pipeline (9) and three lateral lines (10) of preheating material are needed, described lateral line (8) of thermal source material sequentially passes through the evaporator
(1) it is and the generator (3), described to need the secondary lateral line of preheating material (9) to pass through the condenser (4), it is described to preheat thing
Three lateral lines (10) of material pass through the absorber (2), and methods described includes：
The first low-temperature material with middle-low temperature heat in petrochemical plant is allowed to enter described lateral line (8) of thermal source material, and
Driving heat source is used as in the evaporator (1) so that the working-medium water in the evaporator (1) absorbs described first by evaporating
The heat of low-temperature material, and high-pressure working medium steam is evaporated to, and enter in the absorber (2)；
Allow the 3rd low-temperature material that petrochemical plant domestic demand is preheated to need three lateral lines (10) of preheating material into described, and allow institute
State the dense absorbent solution in absorber (2) and the heat for producing high temperature is mixed with the high-pressure working medium steam, so as to preheat institute
The 3rd low-temperature material is stated, is then delivered in the 3rd process pipeline of petrochemical plant, and allows the absorbent solution of dilution to pass through institute
State heat exchanger (5) and be transported to the generator (3)；
Allow first low-temperature material in described lateral line (8) of thermal source material in the generator (3) as drive
Dynamic thermal source heats the absorbent solution of the dilution, forms low pressure working fluid steam and dense absorbent solution, it is allowed to the low pressure work
Matter steam is transported in the condenser (4)；
The dense absorbent solution in the generator (3) is transported to by the exchanger (5) by the solution pump (6)
The absorber (2)；
By the heat exchanger (5) in the dense absorbent solution conveyed by the generator (3) and by the absorber (2)
Heat-shift between the absorbent solution of the dilution of conveying；
Allow the second low-temperature material that petrochemical plant domestic demand is preheated to need the secondary lateral line of preheating material (9) into described, and pass through suction
Heat and pre-heating temperature elevation that the low pressure working fluid steam condensation in the condenser (4) produces are received, the of petrochemical plant is then delivered to
In two process pipelines, and the low pressure working fluid steam is caused to be condensed into working-medium water；And
The working-medium water in the condenser (4) is transported in the evaporator (1) by the cryogenic fluid pump (7).
4. method according to claim 3, wherein,
Temperature of first low-temperature material when entering the evaporator (1) in described lateral line (8) of thermal source material
For 60-80 DEG C, the temperature when leaving the generator (3) is 30-50 DEG C；
Temperature of second low-temperature material needed in the secondary lateral line of preheating material (9) when entering the condenser (4)
Spend for 20-40 DEG C, the temperature when leaving the condenser (4) is 35-55 DEG C；And
Temperature of the 3rd low-temperature material needed in three lateral lines (10) of preheating material when entering the absorber (2)
Spend for 40-60 DEG C, the temperature when leaving the absorber (2) is 80-100 DEG C.
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| CN107763706A (en) * | 2017-11-14 | 2018-03-06 | 北京华清微拓节能技术股份公司 | For reclaim petrochemical plant waste heat be used for heat system and method |
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| CN107120869B (en) | 2023-06-02 |
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