CN108479312A - Energy-saving desulfurization solvent regenerative system and technique - Google Patents
Energy-saving desulfurization solvent regenerative system and technique Download PDFInfo
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- CN108479312A CN108479312A CN201810509527.5A CN201810509527A CN108479312A CN 108479312 A CN108479312 A CN 108479312A CN 201810509527 A CN201810509527 A CN 201810509527A CN 108479312 A CN108479312 A CN 108479312A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1468—Removing hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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Abstract
The invention discloses a kind of energy-saving desulfurization solvent regenerative system and techniques, energy-saving desulfurization solvent regenerative system therein includes solvent regeneration system equipped with regenerator, heat pump fluid is equipped in interior cycle heat pump fluid system boils the lithium bromide temperature raising system of heat of providing again for regenerator bottom of tower solvent；The energy-saving desulfurization solvent regeneration technology, including A. solvent regeneration process, B. heat pump fluids technique, C. lithium bromide temperature raising techniques.The present invention regenerates the gas-phase potential heat of column overhead using heat pump fluid extraction, there is provided heat and low-temperature receiver after compression for lithium bromide temperature raising system, make lithium-bromide solution in lithium bromide temperature raising system contacted with vapor absorb after the high temperature that generates provide again boiling hot source for regenerator bottom of tower solvent.The present invention is suitable for the places such as refinery, chemical plant, for MDEA solvent method desulfurization.
Description
Technical field
The invention belongs to solvent circulating flue gas desulfurization technical fields, are related to solvent method desulfurization regeneration system and technique, specifically
It is a kind of energy-saving desulfurization solvent regenerative system and technique that ground, which is said,.
Background technology
Currently, domestic petroleum, chemical industry, liquefied gas, dry gas, sulphur incinerator flue gas etc. are followed using MDEA solvents substantially
Ring desulphurization system.Solvent initially enters the counter current contactings such as absorption tower and dry gas, liquefied gas, carries out extracting operation；In process-stream
The sulfur-containing compounds such as hydrogen sulfide enter solvent, rich hydrogen sulfide containing solvent is known as rich solution, is regenerated into solvent regeneration system；It is molten
Agent regenerative system first flashes the rich solution that absorption tower is taken, the lighter hydrocarbons of abjection wherein solvent；Rich solution after flash distillation is through heat exchange
Enter regenerator afterwards, parsed under the action of tower bottom reboiler, sour gas is flowed out from tower top, is cooled down into cooler；After cooling
Sour gas send out and enter the downstream units such as sulphur, the cooling acid water generated is in addition to part is sent out, mostly as regenerator
Reflux return regenerator.In solvent method desulfurization regeneration system at this stage, general energy consumption is huge, to one 10,000,000 tons/year
Refinery, consume low-pressure steam about 40-60t/h, 5% or so of Zhan Quan factories energy consumption.Therefore desulfurization regeneration system is energy-saving
As one of refinery's major tasks;
To solve the problems, such as that solvent method desulfurization regeneration system energy consumption is larger, application No. is the solvent of CN201110128227.0 cycles
In absorption process flue gas desulfurization in the heat pump regeneration flow Chinese invention patent of desulfurization solvent, again in solvent by MVR compressor applications
Raw system, produced regeneration gas compressed action, becomes high-temperature high-pressure overheat steam when being regenerated to desulfurization solvent by compressor,
And regeneration tower bottoms is heated and vaporized using this superheated steam as heat source, to realize to tower top low-temp recovery gas waste heat
Recycling.But the technology has the following problems：One, mechanical vapor compressor development is still immature, especially mainframe
Group, because regeneration column overhead heat is huge, unit design is difficult；Two, regeneration column overhead is rich in a large amount of sulfide, and corrosivity is strong, easily
Carry product containing ferric ion corrosion secretly, and mechanical commprssor compresses mainly for pure steam and generates development, under such conditions,
Mechanical vapor compressor will be difficult to run or the cycle of operation is extremely short；Three, because tower overhead gas is rich in sulfide, tower overhead gas is through compressor
After compressing increasing temperature and pressure, freezing curve is curve non-rectilinear, on the one hand unit COP is caused to reduce in this way, on the other hand caused
, easily there is local overheating in the difficult design of solvent reboiler（More than 130 DEG C, otherwise solvent side heat exchanging pipe wall temperature is not easy
Solvent easily decomposes）;
When using heat pump techniques reclaiming column overhead waste heat, if compressing it machine for regenerator bottom heat source, there are two to ask
Topic：First, 120 DEG C of temperature is boiled at regenerator bottom again, then the heat pump fluid from heat pump system is after compressor compresses, adiabatic condensation temperature
It to be more than at least 120 DEG C, the requirement is excessively harsh for heat pump system, and it is big that the prior art solves difficulty；Second is that taking heat from tower top
Afterwards, that is, it assumes that the super heat pump that can be used, heat is taken to arrive 80 DEG C of process-stream, then the system is calculated from thermodynamics
COP only has 2.5 or so, with use steam phase ratio without clear superiority;
And when individually being boiled again for bottom of tower with lithium bromide heat pump system recovery tower top heat, it is calculated with thermodynamics quantity when operation
COP requires the heat source temperature of input lithium bromide system at 90 DEG C or more 0.4 or so, and tower top temperature is examined only at 104 DEG C
Consider the heat transfer temperature difference of 10 DEG C of tower top heat exchanger, tower top material needs 100 DEG C and just leaves tower top heat taking and exchanging device, because in overhead stream
It is mixed with sulfide, most of heat of condensation is just discharged at 100 DEG C or less, therefore poor using lithium bromide system practical application effect.
Invention content
It is existing in the prior art above insufficient to solve, the present invention is intended to provide a kind of energy-saving desulfurization solvent regeneration system
System and technique are after compression lithium bromide temperature raising system to reach the gas-phase potential heat for utilizing heat pump fluid extraction regeneration column overhead
Heat and low-temperature receiver are provided, make lithium-bromide solution in lithium bromide temperature raising system contact with vapor absorb after the high temperature that generates to regenerate
Tower bottom of tower solvent provides again the purpose in boiling hot source.
To achieve the above object, the technical solution adopted in the present invention is as follows：A kind of energy-saving desulfurization solvent regenerative system,
Include the solvent regeneration system equipped with regenerator, after solvent regeneration system can make rich solution and the lean solution heat temperature raising of regenerator bottom of tower
Into regenerator, rich solution is boiled again in regenerator bottom of tower, is parsed, to the sour gas of tower top outflow carry out it is cooling, send out；It is energy-saving de-
Sulphur solvent regeneration system further includes heat pump fluid system and lithium bromide temperature raising system：Heat is equipped in the interior cycle of heat pump fluid system
Pump work substance, heat pump fluid system can extract regenerator overhead vapours latent heat；After heat pump fluid temperature raising pressure-raising, heat pump fluid energy
For in lithium bromide temperature raising system lithium-bromide solution evaporation and concentrating and condensed water evaporation gasification heat is provided；And heat pump fluid is through subtracting
After pressure drop temperature, the Water vapor condensation in lithium bromide temperature raising system can be made to be water and recycle the heat of condensation process releasing；Bromination
Lithium temperature raising system can make the Water vapor condensation of lithium-bromide solution evaporation and concentrating be water, be vapor by water evaporation；Evaporation and concentrating
Lithium-bromide solution contacts after heat exchange with the vapor of water evaporation with the lithium-bromide solution for having absorbed vapor, is regenerator bottom of tower
Solvent boils offer heat again.
As an improvement of the present invention, solvent regeneration system includes solvent feed unit and solvent regeneration unit：Solvent feed
Unit includes passing sequentially through the connected expanding machine of pipeline, flash tank, feed pump, feed heater：Expanding machine is driven simultaneously by motor
To rich solution pressure recovery energy；Flash tank can remove the lighter hydrocarbons of rich solution；Feed pump pressurizes to rich solution；Feed heater to rich solution and
It is delivered to regenerator after the lean solution heat temperature raising of regenerator bottom of tower；
Air cooler that the regenerator tower top outlet of solvent regeneration unit is sequentially connected by pipeline, acid water return tank, acid water
Pump is connected with regenerator entrance；After so that overhead gas is gone out tower, hydrogen sulfide gas is sent out into energy-saving desulfurization after air cooler condenses
Solvent regeneration system, for the acid water condensed into after the pressurization of acid water pump, a part sends out energy-saving desulfurization solvent regenerative system,
Most of regenerator that returns is as cold reflux；Solvent regeneration unit further includes the feed heater being connected with regenerator bottom of tower, into
Expect that heater flows into a part of solvent in feed heater, another part solvent is exchanged heat by lithium bromide temperature raising system,
Obtain bottom of tower solvent boiling hot amount again.
As a further improvement on the present invention, cycle includes passing sequentially through pipeline to be connected and head and the tail phase in heat pump fluid system
Tower top heat collector, compressor, the expansion valve connect；Tower top heat collector is placed between regenerator tower top outlet and air cooler, for carrying
Take overhead vapours latent heat；Compressor is driven by driving machine, to heat pump fluid temperature raising pressure-raising；Expansion valve can add heat pump fluid
Pressure drop temperature.
As the further improvement of the present invention, driving motor is arranged in series with compressor, expanding machine so that heat pump fluid
System can be worked at the same time with solvent regeneration system.
As the further improvement of the present invention, lithium bromide temperature raising system includes the container equipped with lithium-bromide solution, container
It is interior to be equipped with two chambers：It is divided into the generator and condenser being connected in first chamber：Lithium-bromide solution and heat pump in generator
Heat pump fluid pipeline heat exchange in working substance system after temperature raising pressure-raising, the lithium bromide vapor to be formed that gasifies enter condenser；Condensation
Vapor and the heat pump fluid pipeline of decompression cooling in heat pump fluid system exchange heat in device, and it is that water enters aqueous vapor to make Water vapor condensation
Pipeline；It is divided into the absorber and evaporator being connected in second chamber：Water in water and gas conduit is delivered to after lime set pump pressurization
Evaporator, the water in evaporator exchange heat with the heat pump fluid pipeline after temperature raising pressure-raising, make water evaporating into vapor and enter absorber
It is interior；Lithium-bromide solution in absorber is delivered to after regenerator heat temperature raising in generator, the bromination of the concentrate in generator
Lithium solution after solution pump is pressurizeed, in regenerator with absorbed in absorber vapor lithium-bromide solution exchange heat it is laggard
Enter absorber, contacts absorption with vapor in absorber, it is molten to be conveyed from bottom of tower solvent circulating pump to regenerator bottom of tower
Agent heat exchange heating.
Another as the present invention improves, heat pump fluid R245FA.
The present invention also provides a kind of energy-saving desulfurization realized using above-mentioned energy-saving desulfurization solvent regenerative system is molten
Agent regeneration technology, its technical solution is as follows：
A kind of energy-saving desulfurization solvent regeneration technology, including step A. solvent regeneration process：To the poor of rich solution and regenerator bottom of tower
Enter regenerator after liquid heat temperature raising, rich solution is boiled again in regenerator bottom of tower, is parsed, to the sour gas of tower top outflow carry out it is cooling,
It sends out；Energy-saving desulfurization solvent regeneration technology is further comprising the steps of：
B. heat pump fluid technique
B1. regenerator overhead vapours latent heat is extracted by the heat pump fluid in heat pump fluid system；
B2. after by lithium bromide body temperature system to heat pump fluid temperature raising pressure-raising, heat pump fluid is the bromination in lithium bromide temperature raising system
Lithium solution evaporation and concentrating and condensed water evaporation gasification provide heat；
B3. after by lithium bromide body temperature system to heat pump fluid decompression cooling, the Water vapor condensation in lithium bromide temperature raising system is made to be
Water；
B4. regeneration column overhead is returned to after the heat in heat pump fluid recycling step B3 condensation process；
C. lithium bromide temperature raising technique
C1. the heated heating of lithium-bromide solution, the heat pump fluid in step B2 after temperature raising and bromination in lithium bromide temperature raising system
Lithium solution exchanges heat, and makes lithium-bromide solution evaporation and concentrating, forms vapor；
C2. the vapor heat exchange formed in the heat pump fluid and C1 after cooling down in step B3, it is water to make Water vapor condensation；
C3. the condensed water heat exchange in the heat pump fluid and C2 in step B2 after temperature raising, makes water evaporating into vapor；
In C4.C1 in generator after the pressurization of concentrate lithium-bromide solution with absorbed the lithium-bromide solution of vapor after heat exchange with C3
In vapor contact absorb, provide heat for boiling again for regenerator bottom of tower solvent.
Another as the present invention improves, and step A includes：
A1. solvent feed
After rich solution enters solvent feed unit, expanded machine pressure recovery energy enters flash tank and flashes, by feed pump pair after decompression
After rich solution pressurization after flash distillation, rich solution is entered into regenerator with the lean solution come from regenerator bottom after feed heater exchanges heat；
A2. solvent reclamation
A21. the rich solution entered after regenerator is contacted with the steam counter-flow from bottom of tower, steam stripping regeneration；
A22. after overhead gas goes out tower, after the cooling of tower top heat collector, then hydrogen sulfide gas is sent out after being condensed by air cooler and is saved
It can type desulfurization solvent regenerative system；The acid water condensed into sends regenerator back to and does cold reflux；
A23. the solvent of bottom of tower send a part to feed heater through bottom of tower solvent circulating pump, and a part is through lithium bromide temperature raising system
System obtains the heat that bottom of tower solvent boils again.
As the third improvement of the present invention, in stepb：
B1. regenerator overhead vapours latent heat is extracted through tower top heat collector by the heat pump fluid in heat pump fluid system, it is rear to enter pressure
Contracting machine temperature raising pressure-raising；
B2. after by compressor to heat pump fluid temperature raising pressure-raising, heat pump fluid is that the lithium-bromide solution in lithium bromide temperature raising system steams
It sends out concentrate and condensed water evaporation gasification provides heat；
B3. after by expansion valve to heat pump fluid decompression cooling, it is water to make the Water vapor condensation in lithium bromide temperature raising system；
B4. it is returned in tower top heat collector after the heat in heat pump fluid recycling step B3 condensation process.
There is a kind of improvement as the present invention, in step C：
C1. the lithium-bromide solution that vapor has been absorbed in absorber is delivered to after regenerator heat temperature raising in generator, in step
When heat pump fluid pipeline in rapid B2 after temperature raising exchanges heat with lithium-bromide solution in generator, the lithium-bromide solution in generator is made to steam
Concentrate is sent out, the vapor of formation leaves generator and enters condenser；
C2. the vapor formed in the heat pump fluid and C1 after cooling down in step B3 exchanges heat in condenser, keeps vapor solidifying
Become water to enter in water and gas conduit, the water in water and gas conduit is delivered to evaporator after lime set pump pressurization；
C3. the condensed water in the heat pump fluid and C2 in step B2 after temperature raising exchanges heat in evaporator, makes water evaporating into water steaming
Gas enters absorber；
The lithium-bromide solution after concentrate in C4.C1 in generator and has absorbed vapor after solution pump is pressurizeed in absorber
Lithium-bromide solution enter absorber after regenerator exchanges heat, contact absorption with vapor in absorber, exotherm is again
Raw tower bottom of tower solvent boils offer heat again.
Due to the adoption of the above technical solution, compared with prior art, the present invention acquired advantageous effect is：
（1）The present invention utilizes heat pump techniques, builds energy-saving solvent regeneration process：Hot heat exchange is taken by tower top using heat pump fluid
Device extracts the gas-phase potential heat of tower top, enters lithium bromide temperature raising system after compression, is the evaporator and hair of lithium bromide temperature raising system
Raw device provides heat, provides condensation low-temperature receiver for condenser, and lithium bromide temperature raising system absorber generates high temperature, is that regenerator bottom of tower is molten
Agent provides boiling hot source again；
（2）The present invention in such a way that lithium bromide temperature raising system is combined, is primarily due to using heat pump fluid system：Heat pump fluid
Compressor outlet heat pump fluid can reach 100 DEG C of adiabatic condensation temperature in system, and 100 DEG C are not enough to reboiling materials at bottom of tower, need
It is that boiling again for regenerator bottom of tower solvent provides heat to increase lithium bromide temperature raising system；
（3）The solvent regeneration system of the present invention carries out again bottom of tower solvent using the high temperature heat source that lithium bromide temperature raising system provides
Boiling makes regenerator carry out the regeneration of desulfurization solvent；
（4）The heat pump fluid system of the present invention can recycle the gas-phase potential heat of solvent regeneration system tower top, be carried through compressor
After warm pressure-raising, for the evaporator and generator of lithium bromide temperature raising system heat source is provided, condensation low-temperature receiver is provided for condenser, and recycled
The heat that condensation process is released；
（5）The lithium bromide temperature raising system of the present invention will be in generator using the heat pump fluid after temperature raising pressure-raising in heat pump fluid system
Lithium-bromide solution evaporation and concentrating and make liquid water evaporation in evaporator, utilizes the heat after decompression cooling in heat pump fluid system
Water vapor condensation is water by pump work substance, and to carry out absorption of the lithium-bromide solution to vapor in absorber, generating high temperature is
Regenerator bottom of tower solvent provides boiling hot amount again；
（6）Entirety COP of the present invention is up to 4 or more, and energy-saving effect is up to 30% or more, for typical 10,000,000 tons/year of refinery,
Year pure economic benefit is at 10,000,000 yuan or more, significant effect；
（7）Applicability of the present invention is wide, has stronger practicability, system equipment more to hold under industrial design manufacture level at this stage
Easily realize.
The present invention is suitable for the places such as refinery, chemical plant, for MDEA solvent method desulfurization.
Description of the drawings
Below in conjunction with the accompanying drawings and specific embodiment is made further to be described in detail to the present invention.
Fig. 1 is the structural schematic diagram of the embodiment of the present invention 1；
Fig. 2 is 7 structural schematic diagram of lithium bromide temperature raising system in the embodiment of the present invention 1.
In figure：1, regenerator；2, tower top heat collector；3, air cooler；4, acid water return tank；5, acid water pump；6, bottom of tower
Solvent circulating pump；7, lithium bromide temperature raising system；8, expansion valve；9, feed pump；10, driving machine；11, compressor；12, expanding machine；
13, flash tank；14, feed heater；15, generator；16, solution pump；17, regenerator；18, absorber；19, evaporator；20、
Lime set pumps；21, condenser；22, water and gas conduit.
Specific implementation mode
A kind of energy-saving desulfurization solvent regenerative system of embodiment 1
As shown in Figs. 1-2, the present embodiment includes solvent regeneration system, heat pump fluid system and lithium bromide temperature raising system 7.
One, solvent regeneration system
Solvent regeneration system includes solvent feed unit and solvent regeneration unit.
Solvent feed unit includes passing sequentially through the connected expanding machine 12 of pipeline, flash tank 13, feed pump 9, charging heating
Device 14.Expanding machine 12 is driven by motor and to rich solution pressure recovery energy；Flash tank 13 can remove the lighter hydrocarbons of rich solution；Feed pump 9 is to richness
Liquid pressurizes；Feed heater 14 after the lean solution heat temperature raising of 1 bottom of tower of rich solution and regenerator to being delivered to regenerator 1.
Air cooler 3 that 1 tower top outlet of regenerator of solvent regeneration unit is sequentially connected by pipeline, acid water return tank 4,
Acid water pump 5 is connected with 1 entrance of regenerator.After overhead gas goes out tower, hydrogen sulfide gas sent out after the condensation of air cooler 3 energy saving
Type desulfurization solvent regenerative system, for the acid water condensed into after the pressurization of acid water pump 5, a part sends out energy-saving desulfurization solvent again
Raw system, most of regenerator 1 that returns is as cold reflux.
Solvent regeneration unit further includes the bottom of tower solvent circulating pump 6 being connected with 1 bottom of tower of regenerator, 1 bottom of tower of regenerator it is molten
Agent through a part of solvent of bottom of tower circulating pump as lean solution flow into feed heater 14 in, this part lean solution through feed heater 14 with
Rich solution enters in regenerator 1 together；Another part solvent exchanges heat with lithium bromide temperature raising system 7, makes bottom of tower solvent through bromination
Lithium temperature raising system 7 obtains bottom of tower solvent boiling hot amount again.
From the foregoing, it will be observed that solvent regeneration system enters regenerator after capable of making the lean solution heat temperature raising of 1 bottom of tower of rich solution and regenerator
1, rich solution is boiled again in 1 bottom of tower of regenerator, is parsed, to the sour gas of tower top outflow carry out it is cooling, send out；Also, solvent reclamation system
System can boil bottom of tower solvent again using the high temperature heat source that lithium bromide temperature raising system 7 provides, and so that regenerator 1 is carried out desulfurization molten
The regeneration of agent.
Two, heat pump fluid system
Heat pump fluid, heat pump fluid R245FA are equipped in the interior cycle of heat pump fluid system.Cycle packet in heat pump fluid system
It includes and passes sequentially through pipeline and be connected and end to end tower top heat collector 2, compressor 11, expansion valve 8, that is to say, that expansion valve 8 is logical
Piping is connected with 2 pipeline of tower top heat collector.
Tower top heat collector 2 is placed between 1 tower top outlet of regenerator and air cooler 3, for extracting tower top steam latent heat, and
After tower top heat collector 2 can also being utilized first to cool down overhead vapours, reuses air device and further cool down.Expansion valve 8 can be to heat pump
Working medium carries out pressurization cooling, and heat pump fluid is made to flow back to again in tower top heat collector 2.Compressor 11 is driven by driving machine 10, to heat pump
Working medium temperature raising pressure-raising, driving motor are arranged in series with compressor 11, expanding machine 12 so that heat pump fluid system and solvent reclamation system
System can work at the same time.
From the foregoing, it will be observed that heat pump fluid system can extract 1 overhead vapours latent heat of regenerator.To heat pump fluid temperature raising pressure-raising
Afterwards, heat pump fluid can in lithium bromide temperature raising system 7 lithium-bromide solution evaporation and concentrating and condensed water evaporation gasification heat is provided；
And heat pump fluid can not only make the Water vapor condensation in lithium bromide temperature raising system 7 be water after decompression cools down, additionally it is possible to will coagulate
The heat recovery that knot process is released.
Three, lithium bromide temperature raising system 7
Lithium bromide temperature raising system 7 includes that the container of lithium-bromide solution is housed, two chambers setting up and down in container：
It is divided into the generator 15 being connected and condenser 21 in first chamber.Lithium-bromide solution and heat pump fluid system in generator 15
Heat pump fluid pipeline heat exchange in system after temperature raising pressure-raising makes the lithium bromide vapor to be formed that gasifies enter in condenser 21.Condensation
Vapor and the heat pump fluid pipeline of decompression cooling in heat pump fluid system exchange heat in device 21, and it is that water enters water to make Water vapor condensation
Feed channel 22, while the heat for making heat pump fluid recycling condensation process release；
It is divided into the absorber 18 being connected and evaporator 19 in second chamber.Water in water and gas conduit 22 is after 20 pressurization of lime set pump
It is delivered to evaporator 19, the water in evaporator 19 exchanges heat with the heat pump fluid pipeline after temperature raising pressure-raising, makes water evaporating into vapor
Into in absorber 18.Lithium-bromide solution in absorber 18 is delivered to after 17 heat temperature raising of regenerator in generator 15, hair
The lithium-bromide solution of concentrate in raw device 15 has absorbed water after the pressurization of solution pump 16, in regenerator 17 and in absorber 18 and has steamed
Enter absorber 18 after the lithium-bromide solution heat exchange of gas, lithium-bromide solution contacts absorption with vapor in absorber 18, is
The solvent heat exchange heating conveyed from bottom of tower solvent circulating pump 6 to 1 bottom of tower of regenerator.
From the foregoing, it will be observed that lithium bromide temperature raising system 7 can make the Water vapor condensation of lithium-bromide solution evaporation and concentrating be water, steam water
Hair is vapor；The lithium-bromide solution of evaporation and concentrating and absorbed the dense lithium-bromide solution of vapor after heat exchange with by water evaporation
Vapor contact, provide heat for 1 boiling again for bottom of tower solvent of regenerator.
A kind of energy-saving desulfurization solvent regeneration technology of embodiment 2
The present embodiment is realized using the energy-saving desulfurization solvent regenerative system implemented in 1, is included the following steps：
A. solvent regeneration process
A1. solvent feed
From liquefied gas, dry gas desulphurization system and hydrogen sulfide temperature is fully absorbed in 40 DEG C -45 DEG C, pressure 1.0Mpa's or more
After rich solution enters solvent feed unit, 12 pressure recovery energy of expanded machine enters the flash distillation that flashing pressure is 0.15Mpa after decompression
Flash distillation, 0.2Mpa or more is forced by feed pump 9 to the rich solution after flash distillation in tank 13, by rich solution with from the poor of 1 bottom of regenerator
Liquid enters regenerator 1 after the heat exchange of feed heater 14.Temperature control is boiled at 120 DEG C in bottom of tower again in regenerator 1, top gaseous phase temperature
Degree is 104 DEG C, tower top pressure 80-100kpa;
A2. solvent reclamation
A21. the rich solution entered after regenerator 1 is contacted with the steam counter-flow from bottom of tower, steam stripping regeneration；
A22. after overhead gas goes out tower, 80 DEG C are cooled to through tower top heat collector 2, then be cooled to 50 DEG C or less by air cooler 3 to coagulate
The acid water formed sends regenerator 1 back to and does cold reflux, and hydrogen sulfide gas sends out energy-saving desulfurization solvent regenerative system；
A23. a part of solvent is sent through bottom of tower solvent circulating pump 6 and returns regenerator into feed heater 14 by the solvent of bottom of tower
In 1, another part obtains the heat that bottom of tower solvent boils again through the heat exchange of lithium bromide temperature raising system 7.
B. heat pump fluid technique
B1. the R245FA heat pump fluids in heat pump fluid system are warming up to 95 DEG C or more through tower top heat collector 2, enter compressor afterwards
11 temperature raising pressure-raisings, boost in pressure to more than 1.010MPa or more；
B2. after by compressor 11 to heat pump fluid temperature raising pressure-raising, heat pump fluid is the lithium-bromide solution in lithium bromide temperature raising system 7
Evaporation and concentrating and condensed water evaporation gasification provide heat, and heat pump fluid becomes liquid due to heat release at this time, and temperature is down to 100 DEG C；
B3. heat pump fluid being depressurized by expansion valve 8 and is cooled down --- temperature is 70 DEG C, pressure 405KPa, makes lithium bromide temperature raising system 7
In Water vapor condensation be water；
B4. it is returned in tower top heat collector 2 after the heat in heat pump fluid recycling step B3 condensation process.
C. lithium bromide temperature raising technique
C1. the dense lithium-bromide solution of vapor has been absorbed in absorber 18 is delivered to generator 15 after 17 heat temperature raising of regenerator
It is interior, when a concentration of 60% or more lithium-bromide solution exchanges heat in the heat pump fluid pipeline and generator 15 in step B2 after temperature raising,
Lithium-bromide solution is heated to 90 DEG C or more, and pressure is less than 30KPa, makes the lithium-bromide solution evaporation and concentrating in generator 15, shape
At vapor leave generator 15 enter condenser 21；
C2. the vapor formed in the heat pump fluid and C1 after cooling down in step B3 heat exchange in condenser 21, makes vapor
It is cooled to 80 DEG C and is condensed into water and enter in water and gas conduit 22, the water in water and gas conduit 22 is delivered to evaporation after 20 pressurization of lime set pump
Device 19；
C3. the condensed water in the heat pump fluid and C2 in step B2 after temperature raising is in the evaporator 19 that pressure is 1 atmospheric pressure
Heat exchange, makes water evaporating into 100 DEG C of vapor and enters absorber 18；
The lithium-bromide solution after concentrate in C4.C1 in generator 15 and has absorbed after the pressurization of solution pump 16 in absorber 18
The dense lithium-bromide solution of vapor enters absorber 18 after the heat exchange of regenerator 17 is warming up to 120 DEG C or more, in absorber 18
Absorption is contacted with vapor, exotherm provides heat to 135 DEG C or more, for 1 boiling again for bottom of tower solvent of regenerator.
Claims (10)
1. a kind of energy-saving desulfurization solvent regenerative system includes the solvent regeneration system equipped with regenerator, solvent regeneration system energy
Make to enter regenerator after rich solution and the lean solution heat temperature raising of regenerator bottom of tower, rich solution is boiled again in regenerator bottom of tower, parsed, to tower top
The sour gas of outflow carries out cooling, sends out；It is characterized in that：Energy-saving desulfurization solvent regenerative system further includes heat pump fluid system
And lithium bromide temperature raising system：
Heat pump fluid is equipped in the interior cycle of heat pump fluid system, it is latent that heat pump fluid system can extract regenerator overhead vapours
Heat；After heat pump fluid temperature raising pressure-raising, heat pump fluid can be lithium-bromide solution evaporation and concentrating in lithium bromide temperature raising system and solidifying
It bears water evaporation gasification and heat is provided；And heat pump fluid can make the vapor in lithium bromide temperature raising system solidifying after decompression cools down
Become water and recycles the heat of condensation process releasing；
Lithium bromide temperature raising system can make the Water vapor condensation of lithium-bromide solution evaporation and concentrating be water, be vapor by water evaporation；It steams
The lithium-bromide solution of hair concentrate contacts after heat exchange with the vapor of water evaporation with the lithium-bromide solution for having absorbed vapor, for again
Raw tower bottom of tower solvent boils offer heat again.
2. energy-saving desulfurization solvent regenerative system according to claim 1, it is characterised in that：Solvent regeneration system includes molten
Agent feed unit and solvent regeneration unit：
Solvent feed unit includes passing sequentially through the connected expanding machine of pipeline, flash tank, feed pump, feed heater：Expanding machine
It is driven by motor and to rich solution pressure recovery energy；Flash tank can remove the lighter hydrocarbons of rich solution；Feed pump pressurizes to rich solution；Charging adds
Hot device after the lean solution heat temperature raising of rich solution and regenerator bottom of tower to being delivered to regenerator；
Air cooler that the regenerator tower top outlet of solvent regeneration unit is sequentially connected by pipeline, acid water return tank, acid water
Pump is connected with regenerator entrance；After so that overhead gas is gone out tower, hydrogen sulfide gas is sent out into energy-saving desulfurization after air cooler condenses
Solvent regeneration system, for the acid water condensed into after the pressurization of acid water pump, a part sends out energy-saving desulfurization solvent regenerative system,
Most of regenerator that returns is as cold reflux；
Solvent regeneration unit further includes the feed heater being connected with regenerator bottom of tower, and feed heater flows into a part of solvent
In feed heater, another part solvent is exchanged heat by lithium bromide temperature raising system, obtains bottom of tower solvent boiling hot amount again.
3. energy-saving desulfurization solvent regenerative system according to claim 2, it is characterised in that：Cycle in heat pump fluid system
Including passing sequentially through the connected and end to end tower top heat collector of pipeline, compressor, expansion valve；
Tower top heat collector is placed between regenerator tower top outlet and air cooler, for extracting tower top steam latent heat；Compressor is by driving
Motivation drives, to heat pump fluid temperature raising pressure-raising；Expansion valve can carry out pressurization cooling to heat pump fluid.
4. energy-saving desulfurization solvent regenerative system according to claim 3, it is characterised in that：Driving motor and compressor,
Expanding machine is arranged in series so that heat pump fluid system can be worked at the same time with solvent regeneration system.
5. energy-saving desulfurization solvent regenerative system according to claim 3 or 4, it is characterised in that：Lithium bromide temperature raising system
Include the container equipped with lithium-bromide solution, two chambers are equipped in container：
It is divided into the generator and condenser being connected in first chamber：It is carried in lithium-bromide solution and heat pump fluid system in generator
Heat pump fluid pipeline heat exchange after warm pressure-raising, the lithium bromide vapor to be formed that gasifies enter condenser；In condenser vapor with
The heat pump fluid pipeline heat exchange of decompression cooling in heat pump fluid system, it is that water enters water and gas conduit to make Water vapor condensation；
It is divided into the absorber and evaporator being connected in second chamber：Water in water and gas conduit is delivered to steaming after lime set pump pressurization
Device is sent out, the water in evaporator exchanges heat with the heat pump fluid pipeline after temperature raising pressure-raising, makes water evaporating into vapor and enters in absorber；
Lithium-bromide solution in absorber is delivered to after regenerator heat temperature raising in generator, and the lithium bromide of the concentrate in generator is molten
Liquid enters suction after solution pump is pressurizeed after having absorbed the lithium-bromide solution heat exchange of vapor in regenerator and in absorber
Device is received, contacts absorption with vapor in absorber, the solvent to be conveyed from bottom of tower solvent circulating pump to regenerator bottom of tower changes
Heat heating.
6. the energy-saving desulfurization solvent regenerative system according to any one of claim 1-4, it is characterised in that：Heat pump work
Matter is R245FA.
7. a kind of energy-saving desulfurization solvent regeneration technology, molten using the energy-saving desulfurization described in any one of claim 1-6
Agent regenerative system is realized, including step A. solvent regeneration process：It is laggard to the lean solution heat temperature raising of rich solution and regenerator bottom of tower
Enter regenerator, rich solution is boiled again in regenerator bottom of tower, is parsed, to the sour gas of tower top outflow carry out it is cooling, send out；Its feature exists
In：Energy-saving desulfurization solvent regeneration technology is further comprising the steps of：
B. heat pump fluid technique
B1. regenerator overhead vapours latent heat is extracted by the heat pump fluid in heat pump fluid system；
B2. after by lithium bromide body temperature system to heat pump fluid temperature raising pressure-raising, heat pump fluid is the bromination in lithium bromide temperature raising system
Lithium solution evaporation and concentrating and condensed water evaporation gasification provide heat；
B3. after by lithium bromide body temperature system to heat pump fluid decompression cooling, the Water vapor condensation in lithium bromide temperature raising system is made to be
Water；
B4. regeneration column overhead is returned to after the heat in heat pump fluid recycling step B3 condensation process；
C. lithium bromide temperature raising technique
C1. the heated heating of lithium-bromide solution, the heat pump fluid in step B2 after temperature raising and bromination in lithium bromide temperature raising system
Lithium solution exchanges heat, and makes lithium-bromide solution evaporation and concentrating, forms vapor；
C2. the vapor heat exchange formed in the heat pump fluid and C1 after cooling down in step B3, it is water to make Water vapor condensation；
C3. the condensed water heat exchange in the heat pump fluid and C2 in step B2 after temperature raising, makes water evaporating into vapor；
In C4.C1 in generator after the pressurization of concentrate lithium-bromide solution with absorbed the lithium-bromide solution of vapor after heat exchange with C3
In vapor contact absorb, provide heat for boiling again for regenerator bottom of tower solvent.
8. energy-saving desulfurization solvent regeneration technology according to claim 7, it is characterised in that：Step A includes：
A1. solvent feed
After rich solution enters solvent feed unit, expanded machine pressure recovery energy enters flash tank and flashes, by feed pump pair after decompression
After rich solution pressurization after flash distillation, rich solution is entered into regenerator with the lean solution come from regenerator bottom after feed heater exchanges heat；
A2. solvent reclamation
A21. the rich solution entered after regenerator is contacted with the steam counter-flow from bottom of tower, steam stripping regeneration；
A22. after overhead gas goes out tower, after the cooling of tower top heat collector, then hydrogen sulfide gas is sent out after being condensed by air cooler and is saved
It can type desulfurization solvent regenerative system；The acid water condensed into sends regenerator back to and does cold reflux；
A23. the solvent of bottom of tower send a part to feed heater through bottom of tower solvent circulating pump, and a part is through lithium bromide temperature raising system
System obtains the heat that bottom of tower solvent boils again.
9. energy-saving desulfurization solvent regeneration technology according to claim 7, it is characterised in that：In stepb：
B1. regenerator overhead vapours latent heat is extracted through tower top heat collector by the heat pump fluid in heat pump fluid system, it is rear to enter pressure
Contracting machine temperature raising pressure-raising；
B2. after by compressor to heat pump fluid temperature raising pressure-raising, heat pump fluid is that the lithium-bromide solution in lithium bromide temperature raising system steams
It sends out concentrate and condensed water evaporation gasification provides heat；
B3. after by expansion valve to heat pump fluid decompression cooling, it is water to make the Water vapor condensation in lithium bromide temperature raising system；
B4. it is returned in tower top heat collector after the heat in heat pump fluid recycling step B3 condensation process.
10. the energy-saving desulfurization solvent regeneration technology according to any one of claim 7-9, it is characterised in that：In step
In rapid C：
C1. the lithium-bromide solution that vapor has been absorbed in absorber is delivered to after regenerator heat temperature raising in generator, in step
When heat pump fluid pipeline in rapid B2 after temperature raising exchanges heat with lithium-bromide solution in generator, the lithium-bromide solution in generator is made to steam
Concentrate is sent out, the vapor of formation leaves generator and enters condenser；
C2. the vapor formed in the heat pump fluid and C1 after cooling down in step B3 exchanges heat in condenser, keeps vapor solidifying
Become water to enter in water and gas conduit, the water in water and gas conduit is delivered to evaporator after lime set pump pressurization；
C3. the condensed water in the heat pump fluid and C2 in step B2 after temperature raising exchanges heat in evaporator, makes water evaporating into water steaming
Gas enters absorber；
The lithium-bromide solution after concentrate in C4.C1 in generator and has absorbed vapor after solution pump is pressurizeed in absorber
Lithium-bromide solution enter absorber after regenerator exchanges heat, contact absorption with vapor in absorber, exotherm is again
Raw tower bottom of tower solvent boils offer heat again.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111701402A (en) * | 2020-06-24 | 2020-09-25 | 中国石油大学(华东) | System and process for recovering waste heat at top of carbon dioxide capturing and regenerating tower |
| CN117339350A (en) * | 2023-12-04 | 2024-01-05 | 内蒙古东景生物环保科技有限公司 | NMP solvent method high concentration acetylene purification device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059294A (en) * | 1990-07-31 | 1992-03-11 | 美国Boc氧气集团有限公司 | Produce carbon dioxide and reclaim nitrogen and argon by-product by burnt gas |
| CN101643220A (en) * | 2009-07-29 | 2010-02-10 | 董宏光 | Natural gas type synthesis ammonia energy-saving and emission-reduction technology |
| CN202893154U (en) * | 2013-01-08 | 2013-04-24 | 中国石油化工股份有限公司 | Device for reducing energy consumption of smoke carbon dioxide (CO2) capturing system and improving recovery rate of CO2 |
| CN203501362U (en) * | 2013-10-12 | 2014-03-26 | 程鹏 | Energy storage air conditioner device |
-
2018
- 2018-05-24 CN CN201810509527.5A patent/CN108479312A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059294A (en) * | 1990-07-31 | 1992-03-11 | 美国Boc氧气集团有限公司 | Produce carbon dioxide and reclaim nitrogen and argon by-product by burnt gas |
| CN101643220A (en) * | 2009-07-29 | 2010-02-10 | 董宏光 | Natural gas type synthesis ammonia energy-saving and emission-reduction technology |
| CN202893154U (en) * | 2013-01-08 | 2013-04-24 | 中国石油化工股份有限公司 | Device for reducing energy consumption of smoke carbon dioxide (CO2) capturing system and improving recovery rate of CO2 |
| CN203501362U (en) * | 2013-10-12 | 2014-03-26 | 程鹏 | Energy storage air conditioner device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111701402A (en) * | 2020-06-24 | 2020-09-25 | 中国石油大学(华东) | System and process for recovering waste heat at top of carbon dioxide capturing and regenerating tower |
| CN117339350A (en) * | 2023-12-04 | 2024-01-05 | 内蒙古东景生物环保科技有限公司 | NMP solvent method high concentration acetylene purification device |
| CN117339350B (en) * | 2023-12-04 | 2024-02-27 | 内蒙古东景生物环保科技有限公司 | NMP solvent method high concentration acetylene purification device |
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