CN107144145A - Trapping magnesite melting fume afterheat and CO are reclaimed using LNG cold energy2System and method - Google Patents
Trapping magnesite melting fume afterheat and CO are reclaimed using LNG cold energy2System and method Download PDFInfo
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- CN107144145A CN107144145A CN201710408696.5A CN201710408696A CN107144145A CN 107144145 A CN107144145 A CN 107144145A CN 201710408696 A CN201710408696 A CN 201710408696A CN 107144145 A CN107144145 A CN 107144145A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/06—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
Cold energy of liquefied natural gas of the present invention utilizes field, and in particular to one kind reclaims trapping magnesite melting fume afterheat and CO using LNG cold energy2System and method.Technical scheme is as follows：Including cascade twin-stage nested type Rankine cycle system, LNG gasification system and CO2Trapping system, cascading twin-stage nested type Rankine cycle system includes one-level nested type Rankine cycle outer circulation, one-level nested type Rankine cycle interior circulation, two grades of nested type Rankine cycle outer circulations and two grades of nested type Rankine cycle interior circulations, LNG gasification system includes pump five, the evaporative condenser one, the evaporative condenser two, the evaporative condenser three and the evaporative condenser four being sequentially connected, CO2Trapping system includes the evaporator four, the evaporator three, the evaporator two, the evaporator one, gas-liquid separator and the regenerator three being sequentially connected.The utilization LNG cold energy that the present invention is provided reclaims trapping magnesite melting fume afterheat and CO2System and method, improve energy utilization rate.
Description
Technical field
Cold energy of liquefied natural gas of the present invention utilizes field, and in particular to one kind reclaims trapping magnesite using LNG cold energy and melted
Refine fume afterheat and CO2System and method.
Background technology
In global Energy Consumption amount and primary energy consumption structure, the accounting of natural gas rises year by year：1980~2014
Between year in global primary energy consumption structure, global Natural Gas Consumption Using is steeply risen, and the accounting of natural gas is carried by 19.5%
Up to 23.7%.China's natural gas consumption figure accounts for primary energy ratio by the 5.9% of 2.7% to 2015 years in 2006, every year
Increase by 0.9%.Cut-off 2014, the accounting of global pipeline gas and liquefied natural gas (LNG) is respectively 66.6% and 33.4%, its
In be in the Chinese natural gas of the Asian-Pacific area using LNG as main existence form, within following 10~20 years time, LNG will
Main force as China's natural gas market.China's LNG import volumes were by 900,000,000 m of 20063Rise to 25,800,000,000 m of 20153,
It is average annual to increase by 45.2%；The LNG factories total productive capacity that China has runed is 1,800,000 t, is completed LNG receiving stations 11, is building
With the LNG receiving stations 18 of planning construction, import volume in 2014 is 58,400,000,000 m3, wherein the PORT OF YINKOU being constructed and put into operation for 2015 connects
Receipts ability is 3,000,000 t/a, accounts for China LNG receives total amount 7%.LNG condition of storage is generally t=-162 DEG C, p=
0.14MPa, should generally gasify as the temperature and pressure required by the gas transmission pipeline net work of city before supply user's use.LNG is in gas
During change, a large amount of cold energy (860~883kJ/kg) can be discharged, calculated using this understand the annual available cold power in PORT OF YINKOU as
65MW, equivalent electric energy is about 1,000,000,000 kWh, but does not build up LNG cold energy use projects also in Yingkou City's LNG receiving terminals at present, because
This PORT OF YINKOU possesses a large amount of LNG cold energy being not yet fully used.The cold energy of LNG releases would generally be used as generating, air
Separation, CO2Trapping etc..In LNG cold energy generation systems, if using residual heat resources as system high temperature thermal source, can be lifted cold
The thermal source temperature difference, compared to air and seawater, can effectively reduce the power consumption of seawater or air, and then can improve Rankine and follow
The energy utilization rate of ring.
Global carbon emission report display, China is CO in the past few years2The maximum country's (accounting for 29%) of discharge capacity, and in
State causes whole world CO in 2015 in nearly 2 years to the soaring steadily of the clean energy resource usage amount such as natural gas2Discharge capacity terminates over 10
The rapid growth in year, discharge capacity is 35,700,000,000 t, and wherein industrial process produces CO2Accounting be about 21%, and the melting of magnesite
CO produced by calcining technology2It is the part that can not be ignored in industrial production.China's magnesite resource enriches, and distribution is wide
General, the magnesite of wherein Yingkou City of Liaoning Province In Dashiqiao Area has verified the t of gross reserves 9,300,000, the t of reserves 9,290,000, accounts for the whole province
82.2%, account for more than 56.9% (account for world's magnesite gross reserves more than 16.3%) of national gross reserves.Liaoning in 2013
It is 7.873 × 10 to save production magnesium oxide product6T, often produces 1 ton of MgO product, can at least produce 1.1t CO2, therefore Yingkou
The annual CO in area2Discharge capacity be about 4,000,000 t, and the overwhelming majority discharged with flue gas；As can be seen here, magnesite mining industry in Liaoning Province's is every
The CO in year2Discharge capacity is sizable.Magnesite melting flue gas has taken away substantial amounts of heat simultaneously, accounts for magnesite smelting technology
More than the 12% of total energy consumption, Liaoning Province's annual power consumption of electric-melting magnesium industry is up to 7,000,000,000 kWh and (accounts for the industrial electricity in Soils in Yingkou District
More than 50%, account for the industrial electricity 6.2% in Liaoning Province), therefore the heat that melting flue gas is taken away is equivalent to 8.4 hundred million kWh electricity, and
Melting, the flue gas waste heat recovery of calcined magnesium industry are still in the starting stage at home.Energy utilization rate is improved for environmental protection, is proposed
One kind can reduce CO in magnesite melting production technology2The technology that gas is discharged and residual heat resources are wasted is very urgent.
Current CO2The correlative study of trapping technique concentrates on absorption process and absorption method substantially, and utilizes low-temperature liquefaction method separation CO2Grind
Study carefully relatively fewer and not mature enough.But have correlative study verified utilization low-temperature liquefaction partition method to CO2Carrying out trapping can be with
It is effective to reduce CO2Discharge capacity.Domestic and international CO2Industrial liquid (Gu) chemical industry skill is the gaseous state CO under normal pressure mostly2By 2
Level or 3 grades be compressed to 1.6~2.5MPa, then using refrigeration unit make its cooling liquefy.CO is trapped in low-temperature liquefaction partition method2
In technology, if selected low-temperature receiver can directly be CO2Liquid (Gu) change provide needed for low temperature environment, just can significantly reduce CO2Liquid
The operating pressure and machine utilization of (Gu) chemical industry skill, are finally reached energy-saving purpose.Therefore LNG cold energy is used for CO2Catch
Collection has become the emphasis studied now.But existing utilization LNG cold energy is to CO2In the technology of separation that liquefies, its CO2Source, or
It is the CO assumed in theory2, or the CO that system itself is produced2, and rarely have and be related in magnesite melting or calcining flue gas
CO2.Temperature is about 80 DEG C after magnesite melting flue gas removing dust, and composition is CO2CO is rich in after being mixed with air2Air, therefore
CO in magnesite melting flue gas is trapped using the direct condensation liquefaction isolation technics of LNG2It is theoretically feasible.
Existing utilization LNG cold energy reclaims waste heat and CO in trapping magnesite melting flue gas2Combined-circulation be by bright mostly
Agree circulation to be simply in series, and its cycle fluid is all based on single working medium, to mixed working fluid or blank out, finally
Cause system to there is substantial amounts of cold energy to waste.
The content of the invention
The present invention provides one kind and reclaims trapping magnesite melting fume afterheat and CO using LNG cold energy2System and method,
Improve energy utilization rate.
Technical scheme is as follows：
Trapping magnesite melting fume afterheat and CO are reclaimed using LNG cold energy2System, including cascade twin-stage nested type it is bright
Agree the circulatory system, LNG gasification system and CO2Trapping system, cascade twin-stage nested type Rankine cycle system includes one-level nested type
Rankine cycle outer circulation, one-level nested type Rankine cycle interior circulation, two grades of nested type Rankine cycle outer circulations and two grades of nested types
Rankine cycle interior circulation, one-level nested type Rankine cycle outer circulation include be sequentially connected pump one, evaporator one, steam turbine one,
Evaporative condenser two and evaporative condenser one, one-level nested type Rankine cycle interior circulation include pump two, the regenerator being sequentially connected
First, evaporator two, steam turbine two, the regenerator one and the evaporative condenser two, two grades of nested type Rankine cycle outer circulations
Including the pump three being sequentially connected, evaporator three, steam turbine three, regenerator three, evaporative condenser four and evaporative condenser three, two grades
Nested type Rankine cycle interior circulation includes pump four, regenerator two, evaporator four, steam turbine four, the regenerator being sequentially connected
Two and the evaporative condenser four, LNG gasification system includes the pump five, the evaporative condenser one, the evaporation being sequentially connected
Condenser two, the evaporative condenser three and the evaporative condenser four, CO2Trapping system includes the evaporation being sequentially connected
Device four, the evaporator three, the evaporator two, the evaporator one, gas-liquid separator and the regenerator three.
Described utilization LNG cold energy reclaims trapping magnesite melting fume afterheat and CO2System, wherein one-level nested type
The cycle fluid one of Rankine cycle outer circulation is methane+ethane, and the cycle fluid two of one-level nested type Rankine cycle interior circulation is
Ethane+propylene, the cycle fluid three of two grades of nested type Rankine cycle outer circulations is propylene+propane, two grades of nested type Rankine cycles
The cycle fluid four of interior circulation is normal butane+pentane.
Trapping magnesite melting fume afterheat and CO are reclaimed using LNG cold energy2Method, it is cold based on above-mentioned utilization LNG
Trapping magnesite melting fume afterheat and CO can be reclaimed2System, specifically include following process：
(1) LNG gasification：
LNG from storage tank out is directly entered pump five and carries out pressurized treatments, then sequentially enters evaporative condenser one, steaming
Feel cold the circulation industrial of condenser two, evaporative condenser three, evaporative condenser four respectively with cascade twin-stage nested type Rankine cycle system
Matter one~tetra- is exchanged heat, and the evaporation gasification of itself is realized while condensation to cycle fluid one~tetra-, finally absorb heat gas
Natural gas after change supplies gas net by further heating up plus after smelly processing reaches city gas transmission network temperature requirement
Network；
(2)CO2Trapping：
Magnesite melting flue gas from gas storage holder out has HTHP, and flue gas sequentially enters evaporator four, evaporation
The circulation industrial of the cycle fluid four and two grades of nested type Rankine cycle outer circulations of device three and two grades of nested type Rankine cycle interior circulations
Matter three is exchanged heat, and realizes preliminary precooling；It is nested with one-level that flue gas after precooling sequentially enters evaporator two, evaporator one
It is real that the cycle fluid two of formula Rankine cycle interior circulation and the cycle fluid one of one-level nested type Rankine cycle outer circulation carry out heat exchange
Existing CO2Condensation, from evaporator one come out flue gas in part CO2Liquid is condensed into, the gas-liquid mixture is directly entered
Into gas-liquid separator by liquid CO2Product separation storage；Liquid CO is separated2Flue gas afterwards is directly entered regenerator three and two
The cycle fluid three of level nested type Rankine cycle outer circulation is exchanged heat, and carries out the further utilization of cold energy；Go out from regenerator three
The flue gas come is the relatively low cold air of temperature, can be directly discharged into air or be the air-conditioning and refrigerating equipment of life production district
Cold energy is provided；
(3) the twin-stage nested type Rankine cycle system course of work is cascaded：
A) cycle fluid one in one-level nested type Rankine cycle outer circulation, air-flow is formed after the evaporation of evaporator one
It is directly entered steam turbine one and carries out expansion work, the weary gas one after acting sequentially enters evaporative condenser two, evaporative condenser one
Heat exchange, which is carried out, with the cycle fluid two in LNG and one-level nested type Rankine cycle interior circulation realizes condensation, condensed circulation industrial
Matter one is pressurizeed into pump one, and the cycle fluid one after pressurization enters evaporator one and realizes boil-off gas with flue gas progress heat exchange
Change, form circulation working condition；
B) cycle fluid two in one-level nested type Rankine cycle interior circulation, air-flow is formed after the evaporation of evaporator two
The progress expansion work of steam turbine two is directly entered, the weary gas two after acting enters regenerator one and passes through condensation from what pump two came out
Cycle fluid two after pressurization carries out heat exchange and realizes precooling, the cycle fluid two after precooling enter evaporative condenser two and LNG with
And cycle fluid one in one-level nested type Rankine cycle outer circulation carries out heat exchange and realizes condensation, condensed cycle fluid two according to
Secondary entrance pump two and regenerator one carry out pressurization preheating, and the cycle fluid two after pressurization preheating enters evaporator two to be carried out with flue gas
Evaporation gasification is realized in heat exchange, forms circulation working condition；
C) cycle fluid three in two grades of nested type Rankine cycle outer circulations, air-flow is formed after the evaporation of evaporator three
It is directly entered steam turbine three and carries out expansion work, the weary gas three after acting enters regenerator three with having separated CO2Low temperature cigarette afterwards
Gas carries out heat exchange and realizes precooling, and the cycle fluid three after precooling sequentially passes through evaporative condenser four, evaporative condenser three and LNG and entered
Condensation is realized in row heat exchange, and condensed low-temperature circulating working medium three enters pump three and carries out pressurized treatments, the cycle fluid three after pressurization
Heat exchange is carried out into evaporator three and flue gas and realizes evaporation gasification, forms circulation working condition；
D) cycle fluid four in two grades of nested type Rankine cycle interior circulations, air-flow is formed after the evaporation of evaporator four
It is directly entered steam turbine four and carries out expansion work, the condensation that the weary gas four after acting enters regenerator two with being come out from pump four adds
Cycle fluid four after pressure carries out heat exchange and realizes precooling, and the cycle fluid four after precooling enters evaporative condenser four and LNG and followed
Ring working medium three carries out heat exchange and realizes condensation, and condensed cycle fluid four pressurizes into pump four, the cycle fluid four after pressurization according to
Secondary entrance regenerator two, evaporator four carry out endothermic gasification, form circulation working condition.
Beneficial effects of the present invention are：
1) present invention will cascade twin-stage Rankine cycle and nested type Rankine cycle be combined so that integral system along
Cold fluid and hot fluid flow direction and cold and hot energy direction of transfer all realize temperature counterpart, cascade utilization, form a kind of more perfect
Efficient reclaim waste heat and CO in trapping magnesite melting flue gas using LNG cold energy2The method of resource；
2) present invention in system cycle fluid choose be methane-ethane, ethane-propylene, propylene-propane, normal butane-
Organic working medium mixture as pentane, compared to simple substance working medium, mixing organic matter working medium can more cater to flue gas and LNG change
Warm heat transfer characteristic, effectively reduces irreversible loss of the system in heat transfer process；
3) regenerative apparatus is added in integral system proposed by the present invention, reduces in Rankine cycle condensation process and circulate
Heat transfer temperature difference between working medium and low-temperature receiver and then reduce the loss of the irreversible heat exchange in system；
4) liquefaction has been condensed CO by the present invention2The cold energy contained in low-temperature flue gas afterwards is further utilized so that
It has been finally recovered CO2Low-temperature flue gas temperature be only -61.82 DEG C, the cold air compared to about -120 DEG C in existing system, this hair
Cold energy in cold air produced by bright is more convenient for utilizing；
5) energy utilization rate gets a promotion in integral system proposed by the present invention, and its cold energy use rate is by original
11.8% lifting to 19.71%, itsEfficiency is by 52% original lifting to 56.9%.
Brief description of the drawings
Fig. 1 is to reclaim trapping magnesite melting fume afterheat and CO using LNG cold energy2System schematic.
Embodiment
Below by taking the flue gas that certain typical LNG and In Dashiqiao Area magnesite smelting technology are produced as an example, the present invention is entered
One step is specifically described, but the implementation not limited to this of the present invention, and its operational factor can be according to different LNG, flue gas and to production
The different demands of product and production capacity are modified.
As shown in figure 1, reclaiming trapping magnesite melting fume afterheat and CO using LNG cold energy2System, including cascade is double
Level nested type Rankine cycle system, LNG gasification system and CO2Trapping system, cascade twin-stage nested type Rankine cycle system includes
One-level nested type Rankine cycle outer circulation, one-level nested type Rankine cycle interior circulation, two grades of nested type Rankine cycle outer circulations and
Two grades of nested type Rankine cycle interior circulations, one-level nested type Rankine cycle outer circulation includes pump 1, the evaporator one being sequentially connected
10th, steam turbine 1, evaporative condenser 27 and evaporative condenser 1, one-level nested type Rankine cycle interior circulation include phase successively
Pump 23, regenerator 1, evaporator 2 11, steam turbine 2 19, the regenerator 1 and the evaporative condenser 27 even,
Pump 34 that two grades of nested type Rankine cycle outer circulations include being sequentially connected, evaporator 3 12, steam turbine 3 20, regenerator 3 16,
Evaporative condenser 49 and evaporative condenser 38, two grades of nested type Rankine cycle interior circulations include pump 45, the backheat being sequentially connected
Device 2 15, evaporator 4 13, steam turbine 4 21, the regenerator 2 15 and the evaporative condenser 49, LNG gasification system bag
Include the pump 51 being sequentially connected, the evaporative condenser 1, the evaporative condenser 27, the evaporative condenser 38 and described
Evaporative condenser 49, CO2Trapping system includes the evaporator 4 13, the evaporator 3 12, the evaporation being sequentially connected
Device 2 11, the evaporator 1, gas-liquid separator 17 and the regenerator 3 16.
The course of work is as follows：In LNG gasification system, flow be 4.17kg/s, temperature be -162 DEG C, pressure be
0.14MPa LNG be directly entered after being flowed out from storage tank temperature, pressure after pump 51 is pressurizeed be respectively -161.9 DEG C and
0.28MPa, the LNG after boosting is condensed into one 6 pairs of cycle fluids one of evaporative condenser, the LNG temperature rise after heat absorption
For -144.9 DEG C, LNG now is gas-liquid mixture phase, and and then LNG enters 27 pairs of cycle fluids two of evaporative condenser and followed
Ring working medium one is condensed, and further the temperature of the LNG after heat absorption is changed into -94.84 DEG C, and LNG now is substantially at gaseous state, so
LNG is condensed into 38 pairs of cycle fluids three of evaporative condenser afterwards, after third time is absorbed heat, and LNG temperature is changed into-
94.07 DEG C, and then LNG enters 49 pairs of cycle fluids four of evaporative condenser and cycle fluid three is condensed, by the 4th time
LNG temperature reaches -30.31 DEG C after heat absorption, and LNG now has been gaseous state, by further heating up, adds smelly processing to reach city
City gas transmission pipeline net work just can be passed through after city's gas transmission pipeline net work requirement.
In CO2In trapping system, temperature is 80 DEG C, and the magnesite melting flue gas that pressure is 0.3MPa is steady by gas storage holder
Being initially entered after fixed with 22.22kg/s flow in evaporator 4 13 makes its evaporation gasify the progress heat release of cycle fluid four, puts
Flue-gas temperature after heat is reduced to 49.02 DEG C, and and then flue gas, which enters 3 12 pairs of progress heat releases of cycle fluids three of evaporator, steams it
Getting angry, flue-gas temperature is reduced to 10 DEG C after second of heat release, and then flue gas enters into 2 11 pairs of cycle fluids two of evaporator
Row heat release makes its evaporation gasification, and flue-gas temperature is reduced to -37.92 DEG C after third time heat release, and and then flue gas enters evaporator 1
Heat release is carried out to cycle fluid one to be vaporized, flue-gas temperature is reduced to -97.32 DEG C after the 4th heat release, now in flue gas
Part CO2Generation condensation liquefaction, gas-liquid separator 17 is passed directly into by the flue gas of now gas-liquid mixed state, by liquid CO2Separation
Save as the CO trapped2Product, CO2Product yield is 4315kg/h, has separated part CO2Flue gas afterwards is proceeded immediately to back
Hot device 3 16 further utilizes the cold energy in flue gas, and the flue-gas temperature from regenerator 3 16 out is -61.82 DEG C, throughput
For 21.02kg/s, the air-conditioning and refrigerating equipment that life production district in periphery can be supplied as a kind of cold air product are used.
Cascade twin-stage nested type Rankine cycle system is cascade twin-stage Rankine cycle on Cooling and Heat Source stream flow direction, and
Be a nested type Rankine cycle on cold and hot energy direction of transfer.First in one-level nested type Rankine cycle outer circulation, follow
Ring working medium one is the mixture of methane and ethane, and the mass fraction of its methane is 80%；From evaporator 1 come out temperature for-
43.81 DEG C, pressure for 0.8MPa cycle fluid one be directly entered steam turbine 1 carry out expansion work, the weary gas one after acting
Temperature and pressure be respectively -80 DEG C and 0.4MPa, weary gas sequentially enters evaporative condenser 27, evaporative condenser 1 and LNG
It is condensed and the cycle fluid two in one-level nested type Rankine cycle interior circulation carries out the condensation that mixed working fluid one is realized in heat exchange
Mixed working fluid one (temperature be -140 DEG C) is pressurizeed into pump 1, and the temperature, pressure of mixed working fluid one after pressurization is respectively -
139.7 DEG C and 0.8MPa, and then mixed working fluid one enters evaporator 1 and flue gas carries out heat exchange and realizes that evaporation is gasified, so far
One-level nested type Rankine cycle outer circulation is formed.
In one-level nested type Rankine cycle interior circulation, cycle fluid two is the mixture of ethane and propylene, the quality of ethane
Fraction is 70%；The temperature, pressure come out from evaporator 2 11 is respectively that -8.934 DEG C and 0.2MPa of cycle fluid two directly enters
Enter steam turbine 2 19 and carry out expansion work, the temperature, pressure of weary gas two after acting is respectively -30 DEG C and 0.1MPa, then weary gas enters
Enter regenerator 1 and realize precooling with coming out the progress heat exchange of cycle fluid two after condensation pressurization from pump 23, after precooling
The temperature of cycle fluid two be -50 DEG C, proceed immediately to evaporative condenser 27 and LNG and cycle fluid one progress heat exchange realize it is cold
Solidifying, condensed Temperature of Working is -80 DEG C, is pressurizeed subsequently into pump 23, the pressure of cycle fluid two after pressurization is changed into
0.2MPa, is proceeded immediately to regenerator 1 and is preheated using the waste heat of weary gas two, the temperature of the cycle fluid two after preheating
For -66.58 DEG C, carry out heat exchange subsequently into evaporator 2 11 and flue gas and realize evaporation gasification, so far one-level nested type Rankine is followed
Ring interior circulation is formed.
In two grades of nested type Rankine cycle outer circulations, cycle fluid three is the mixture of propane and propylene, the matter of propylene
It is 50% to measure fraction；The temperature, pressure come out from evaporator 3 12 is respectively that -1.293 DEG C and 0.2MPa of cycle fluid three is direct
Expansion work is carried out into steam turbine 3 20, and the temperature and pressure of the weary gas three after acting is respectively -28 DEG C and 0.1MPa, then
Into regenerator 3 16 with having separated CO2Low-temperature flue gas afterwards carries out heat exchange and realizes precooling, the temperature of cycle fluid three after precooling
For -60 DEG C, the cycle fluid three after precooling sequentially passes through evaporative condenser 49, evaporative condenser 38 and LNG and cycle fluid
Four, which carry out heat exchange, realizes condensation, and the condensed temperature of cycle fluid three is -90 DEG C, pressurized treatments is carried out into pump 34, after pressurization
The temperature, pressure of cycle fluid three be respectively -89.94 DEG C and 0.2MPa, carry out heat exchange into evaporator 3 12 and flue gas and realize to steam
Getting angry, so far two grades of nested type Rankine cycle outer circulations are formed.
In two grades of nested type Rankine cycle interior circulations, cycle fluid four is the mixture of iso-butane and normal butane, isobutyl
The mass fraction of alkane is 44.62%；The temperature, pressure come out from evaporator 4 13 is respectively the cycle fluid of 27 DEG C and 0.3MPa
Four, which are directly entered steam turbine 4 21, carries out expansion work, the temperature, pressure of the weary gas four after acting be respectively -2.575 DEG C and
0.1MPa, the cycle fluid four after the condensation that then weary gas four enters regenerator 2 15 with being come out from pump 45 is pressurizeed is exchanged heat
Precooling is realized, the temperature of cycle fluid four after precooling is -5.848 DEG C, subsequently into evaporative condenser 49 and LNG and circulation industrial
Matter three carries out heat exchange and realizes condensation, and the condensed temperature of cycle fluid four is -80.10 DEG C, proceeds immediately to the pressurization of pump 45, plus
The temperature, pressure of cycle fluid four after pressure is respectively -80 DEG C and 0.3MPa, then sequentially enters regenerator 2 15, evaporator 4 13
Endothermic gasification is carried out, so far two grades of nested type Rankine cycle interior circulations are formed.
Claims (3)
1. reclaim trapping magnesite melting fume afterheat and CO using LNG cold energy2System, it is characterised in that including cascade twin-stage
Nested type Rankine cycle system, LNG gasification system and CO2Trapping system, cascade twin-stage nested type Rankine cycle system includes one
Level nested type Rankine cycle outer circulation, one-level nested type Rankine cycle interior circulation, two grades of nested type Rankine cycle outer circulations and two
Level nested type Rankine cycle interior circulation, one-level nested type Rankine cycle outer circulation includes pump one, evaporator one, the vapour being sequentially connected
Turbine one, evaporative condenser two and evaporative condenser one, one-level nested type Rankine cycle interior circulation include be sequentially connected pump two,
Regenerator one, evaporator two, steam turbine two, the regenerator one and the evaporative condenser two, two grades of nested type Rankine cycles
Outer circulation includes pump three, evaporator three, steam turbine three, regenerator three, evaporative condenser four and the evaporative condenser being sequentially connected
Three, it is pump four that two grades of nested type Rankine cycle interior circulations include being sequentially connected, regenerator two, evaporator four, steam turbine four, described
Regenerator two and the evaporative condenser four, LNG gasification system include the pump five, the evaporative condenser one, institute being sequentially connected
State evaporative condenser two, the evaporative condenser three and the evaporative condenser four, CO2Trapping system includes the institute being sequentially connected
State evaporator four, the evaporator three, the evaporator two, the evaporator one, gas-liquid separator and the regenerator three.
2. utilization LNG cold energy according to claim 1 reclaims trapping magnesite melting fume afterheat and CO2 system, its
It is characterised by, the cycle fluid one of one-level nested type Rankine cycle outer circulation is in methane+ethane, one-level nested type Rankine cycle
The cycle fluid two of circulation is ethane+propylene, and the cycle fluid three of two grades of nested type Rankine cycle outer circulations is propylene+propane,
The cycle fluid four of two grades of nested type Rankine cycle interior circulations is normal butane+pentane.
3. reclaim trapping magnesite melting fume afterheat and CO using LNG cold energy2Method, it is characterised in that based on such as right will
The utilization LNG cold energy described in 1 or 2 is asked to reclaim trapping magnesite melting fume afterheat and CO2System, specifically include mistake as follows
Journey：
(1) LNG gasification：
LNG from storage tank out is directly entered pump five and carries out pressurized treatments, then sequentially enters evaporative condenser one, evaporates cold
The cycle fluid one of condenser two, evaporative condenser three, evaporative condenser four respectively with cascade twin-stage nested type Rankine cycle system
~tetra- are exchanged heat, and are realized while condensation to cycle fluid one~tetra- after the evaporation gasification of itself, final endothermic gasification
Natural gas by further heating up, plus it is smelly processing reach city gas transmission network temperature requirement after supply gas network；
(2)CO2Trapping：
Magnesite melting flue gas from gas storage holder out has HTHP, and flue gas sequentially enters evaporator four, evaporator three
With the cycle fluid four and the cycle fluid three of two grades of nested type Rankine cycle outer circulations of two grades of nested type Rankine cycle interior circulations
Exchanged heat, realize preliminary precooling；It is bright that flue gas after precooling sequentially enters evaporator two, evaporator one and one-level nested type
Agree the cycle fluid two of circulation interior circulation and the cycle fluid one of one-level nested type Rankine cycle outer circulation carries out heat exchange and realizes CO2
Condensation, from evaporator one come out flue gas in part CO2Liquid is condensed into, the gas-liquid mixture enters directly into gas
By liquid CO in liquid/gas separator2Product separation storage；Liquid CO is separated2Flue gas afterwards is directly entered regenerator three and two grades embedding
The cycle fluid three of shell type Rankine cycle outer circulation is exchanged heat, and carries out the further utilization of cold energy；Come out from regenerator three
Flue gas is the relatively low cold air of temperature, can be directly discharged into air or be provided for the air-conditioning and refrigerating equipment for production district of living
Cold energy；
(3) the twin-stage nested type Rankine cycle system course of work is cascaded：
A) cycle fluid one in one-level nested type Rankine cycle outer circulation, formation air-flow is direct after the evaporation of evaporator one
Expansion work is carried out into steam turbine one, the weary gas one after acting sequentially enters evaporative condenser two, evaporative condenser one and LNG
And the cycle fluid two in one-level nested type Rankine cycle interior circulation carries out heat exchange and realizes condensation, condensed cycle fluid one enters
Enter pump one to be pressurizeed, the cycle fluid one after pressurization enters evaporator one and carries out heat exchange realization evaporation gasification with flue gas, is formed
Circulate working condition；
B) cycle fluid two in one-level nested type Rankine cycle interior circulation, formation air-flow is direct after the evaporation of evaporator two
Expansion work is carried out into steam turbine two, the weary gas two after acting enters regenerator one and passes through condensation pressurization from what pump two came out
Cycle fluid two afterwards carries out heat exchange and realizes precooling, and the cycle fluid two after precooling enters evaporative condenser two and LNG and one
Cycle fluid one in level nested type Rankine cycle outer circulation carries out heat exchange and realizes condensation, and condensed cycle fluid two enters successively
Enter pump two and regenerator one carries out pressurization preheating, the cycle fluid two after pressurization preheating is exchanged heat into evaporator two with flue gas
Evaporation gasification is realized, circulation working condition is formed；
C) cycle fluid three in two grades of nested type Rankine cycle outer circulations, formation air-flow is direct after the evaporation of evaporator three
Expansion work is carried out into steam turbine three, the weary gas three after acting enters regenerator three with having separated CO2Low-temperature flue gas afterwards enters
Precooling is realized in row heat exchange, and the cycle fluid three after precooling sequentially passes through evaporative condenser four, evaporative condenser three and LNG and changed
Heat realizes condensation, and condensed low-temperature circulating working medium three enters pump three and carries out pressurized treatments, and the cycle fluid three after pressurization enters
Evaporator three carries out heat exchange with flue gas and realizes evaporation gasification, forms circulation working condition；
D) cycle fluid four in two grades of nested type Rankine cycle interior circulations, formation air-flow is direct after the evaporation of evaporator four
Expansion work is carried out into steam turbine four, after the condensation that the weary gas four after acting enters regenerator two with being come out from pump four is pressurizeed
Cycle fluid four carry out heat exchange and realize precooling, cycle fluid four after precooling enters evaporative condenser four and LNG and circulation industrial
Matter three carries out heat exchange and realizes condensation, and condensed cycle fluid four pressurizes into pump four, and the cycle fluid four after pressurization enters successively
Enter regenerator two, evaporator four and carry out endothermic gasification, form circulation working condition.
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| CN109973165A (en) * | 2019-03-08 | 2019-07-05 | 东北大学 | A kind of natural gas low-carbon combustion and afterheat generating system |
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| CN109973165A (en) * | 2019-03-08 | 2019-07-05 | 东北大学 | A kind of natural gas low-carbon combustion and afterheat generating system |
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| CN114109658A (en) * | 2021-11-26 | 2022-03-01 | 江苏科技大学 | LNG power ship host computer waste heat and LNG vaporization cold energy integrated utilization system |
| CN114109658B (en) * | 2021-11-26 | 2024-02-27 | 江苏科技大学 | LNG power ship host machine waste heat and LNG vaporization cold energy integrated utilization system |
| CN114686281A (en) * | 2022-03-17 | 2022-07-01 | 中国华能集团清洁能源技术研究院有限公司 | Low-carbon heat recovery and trapping device |
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