CN107144145B - Trapping magnesite melting fume afterheat and CO are recycled using LNG cold energy2System and method - Google Patents
Trapping magnesite melting fume afterheat and CO are recycled using LNG cold energy2System and method Download PDFInfo
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- CN107144145B CN107144145B CN201710408696.5A CN201710408696A CN107144145B CN 107144145 B CN107144145 B CN 107144145B CN 201710408696 A CN201710408696 A CN 201710408696A CN 107144145 B CN107144145 B CN 107144145B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Cold energy of liquefied natural gas of the present invention utilizes field, and in particular to a kind of to utilize LNG cold energy recycling trapping magnesite melting fume afterheat and CO2System and method.Technical solution is as follows：Including cascade twin-stage nested type Rankine cycle system, LNG gasification system and CO2Trapping system, cascade twin-stage nested type Rankine cycle system includes recycling in level-one nested type Rankine cycle outer circulation, the interior circulation of level-one nested type Rankine cycle, second level nested type Rankine cycle outer circulation and the Rankine cycle of second level nested type, LNG gasification system includes sequentially connected pump five, the evaporative condenser one, the evaporative condenser two, the evaporative condenser three and the evaporative condenser four, CO2Trapping system includes the sequentially connected evaporator four, the evaporator three, the evaporator two, the evaporator one, gas-liquid separator and the regenerator three.It is provided by the invention to utilize LNG cold energy recycling 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 a kind of molten using LNG cold energy recycling trapping magnesite
Refine fume afterheat and CO2System and method.
Background technique
In global Energy Consumption amount and non-renewable energy consumption structure, the accounting of natural gas rises year by year：1980~2014
Between year in global non-renewable energy consumption structure, global Natural Gas Consumption Using is steeply risen, and the accounting of natural gas is mentioned by 19.5%
Up to 23.7%.China's natural gas consumption figure accounts for non-renewable 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) are respectively 66.6% and 33.4%,
In be in the Asian-Pacific area China natural gas with LNG for main existence form, within following 10~20 years time, LNG will
Main force as China's natural gas market.China's LNG import volume was by 900,000,000 m in 20063Rise to 25,800,000,000 m in 20153,
It is average annual to increase by 45.2%；The LNG factory total productive capacity that China has runed is 1,800,000 t, is completed LNG receiving station 11,
The LNG receiving station 18 with planning construction is built, import volume in 2014 is 58,400,000,000 m3, wherein the PORT OF YINKOU being constructed and put into operation in 2015
Reception ability is 3,000,000 t/a, accounts for about China LNG receives total amount 7%.The condition of storage of LNG is generally t=-162 DEG C, p=
0.14MPa should usually gasify before supplying user's use as temperature and pressure required by the gas transmission pipeline net work of city.LNG is in gas
During change, a large amount of cold energy (860~883kJ/kg) can be discharged, is calculated with this and knows that the annual available cold power in PORT OF YINKOU is
65MW, equivalent electric energy are about 1,000,000,000 kWh, but receive terminal in Yingkou City LNG at present and do not build up LNG cold energy use project also, because
This PORT OF YINKOU, which possesses, is largely not yet received the LNG cold energy made full use of.The cold energy of LNG release would generally be used as power generation, air
Separation, CO2Trapping etc..In LNG cold energy generation system, if be able to ascend cold using residual heat resources as system high temperature heat source
The heat source temperature difference can effectively reduce the power consumption of seawater or air compared to air and seawater, and then Rankine can be improved and follow
The energy utilization rate of ring.
Global carbon emission report display, China is CO in the past few years2Discharge amount is maximum national (accounting for about 29%), and in
State rises so that whole world CO in 2015 to the steady of the clean energy resourcies usage amount such as natural gas in nearly 2 years2Discharge amount terminates over 10
The rapid growth in year, discharge amount are 35,700,000,000 t, and wherein industrial process generates CO2Accounting be about 21%, and the melting of magnesite
CO caused by calcining technology2It is that cannot be neglected a part in industrial production.China's magnesite resource is abundant, and distribution is wide
General, wherein the magnesite of Yingkou City of Liaoning Province In Dashiqiao Area has verified 9,300,000 t of gross reserves, and 9,290,000 t of reserves accounts for the whole province
82.2%, account for 56.9% or more (account for world's magnesite gross reserves 16.3% or more) of national gross reserves.Liaoning in 2013
Saving production magnesium oxide product is 7.873 × 106T, 1 ton of MgO product of every production, at least can produce the CO of 1.1t2, therefore Yingkou
The annual CO in area2Discharge amount be about 4,000,000 t, and the overwhelming majority be discharged with flue gas；It can be seen that Liaoning Province's magnesite mining industry is every
The CO in year2Discharge amount is sizable.Magnesite melting flue gas has taken away a large amount of heat simultaneously, accounts for about magnesite smelting technology
12% or more of total energy consumption, Liaoning Province's annual power consumption of electric-melting magnesium industry are up to 7,000,000,000 kWh and (account for the industrial electricity in Soils in Yingkou District
50% or more, 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 at home still in its infancy.Energy utilization rate is improved for protection environment, is proposed
One kind can reduce CO in magnesite melting production technology2The technology of gas discharge and residual heat resources waste has been very urgent.
CO at present2The correlative study of trapping technique concentrates on absorption process and absorption method substantially, and low-temperature liquefaction method is utilized to separate CO2Grind
Study carefully relatively fewer and not mature enough.But there is correlative study is verified to utilize low-temperature liquefaction partition method to CO2Carrying out trapping can be with
It is effective to reduce CO2Discharge amount.Domestic and international CO2Industrial liquid (Gu) chemical industry skill is the gaseous state CO under normal pressure mostly2By 2
Grade 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 cold source can directly be CO2Liquid (Gu) the required low temperature environment of offer is provided, CO can be significantly reduced2Liquid
Gu the operating pressure and machine utilization of () chemical industry skill, are finally reached energy-saving purpose.Therefore LNG cold energy is used for CO2It catches
Collection has become the emphasis studied now.But it is existing to utilize LNG cold energy to CO2In the technology of liquefaction separation, CO2Source, or
It is the CO theoretically assumed2Or the CO that system itself generates2, and rarely have and be related in magnesite melting or calcining flue gas
CO2.Magnesite melting flue gas temperature after dedusting is about 80 DEG C, and ingredient is CO2CO is rich in after mixing with air2Air, therefore
CO in magnesite melting flue gas is trapped using the direct condensation liquefaction isolation technics of LNG2It is theoretically feasible.
It is existing to utilize waste heat and CO in LNG cold energy recycling trapping magnesite melting flue gas2Combined-circulation be by bright mostly
Agree circulation to be simply connected in series, and its cycle fluid is all based on single working medium, to mixed working fluid or blank out, finally
System is caused to there is a large amount of cold energy waste.
Summary of the invention
The present invention is provided a kind of recycled using LNG cold energy and traps magnesite melting fume afterheat and CO2System and method,
Improve energy utilization rate.
Technical scheme is as follows：
Trapping magnesite melting fume afterheat and CO are recycled 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 level-one nested type
Circulation, second level nested type Rankine cycle outer circulation and second level nested type in Rankine cycle outer circulation, the Rankine cycle of level-one nested type
Circulation in Rankine cycle, level-one nested type Rankine cycle outer circulation include the pump one being sequentially connected, evaporator one, steam turbine one,
Evaporative condenser two and evaporative condenser one, the interior circulation of level-one nested type Rankine cycle includes pump two, the regenerator being sequentially connected
One, evaporator two, steam turbine two, the regenerator one and the evaporative condenser two, second level nested type Rankine cycle outer circulation
Including pump three, evaporator three, steam turbine three, regenerator three, evaporative condenser four and the evaporative condenser three being sequentially connected, second level
Circulation includes pump four, regenerator two, evaporator four, steam turbine four, the regenerator being sequentially connected in nested type Rankine cycle
Two and the evaporative condenser four, LNG gasification system include five, the evaporative condenser one, the evaporation of sequentially connected pump
Condenser two, the evaporative condenser three and the evaporative condenser four, CO2Trapping system includes the sequentially connected evaporation
Device four, the evaporator three, the evaporator two, the evaporator one, gas-liquid separator and the regenerator three.
Described utilizes LNG cold energy recycling trapping magnesite melting fume afterheat and CO2System, wherein level-one nested type
The cycle fluid one of Rankine cycle outer circulation is methane+ethane, and the cycle fluid two recycled in the Rankine cycle of level-one nested type is
Ethane+propylene, the cycle fluid three of second level nested type Rankine cycle outer circulation are propylene+propane, second level nested type Rankine cycle
The cycle fluid four of interior circulation is normal butane+pentane.
Trapping magnesite melting fume afterheat and CO are recycled using LNG cold energy2Method, based on above-mentioned cold using LNG
It can recycling trapping magnesite melting fume afterheat and CO2System, specifically include following process：
(1) LNG gasification：
The LNG come out from storage tank is directly entered pump five and carries out pressurized treatments, then sequentially enters evaporative condenser one, steams
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- exchanges 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：
The magnesite melting flue gas come out from gas storage holder has high temperature and pressure, and flue gas sequentially enters evaporator four, evaporation
The circulation industrial of the cycle fluid four and second level nested type Rankine cycle outer circulation that are recycled in device three and the Rankine cycle of second level nested type
Matter three exchanges heat, and realizes preliminary pre-cooling；It is nested with level-one that flue gas after pre-cooling sequentially enters evaporator two, evaporator one
It is real that the cycle fluid one of the cycle fluid two and level-one nested type Rankine cycle outer circulation that recycle in formula Rankine cycle carries out heat exchange
Existing CO2Condensation, from evaporator one come out flue gas in part CO2Be condensed into liquid, the gas-liquid mixture directly into
Enter liquid CO into gas-liquid separator2Product separation storage；Liquid CO is separated2Flue gas afterwards be directly entered regenerator three with
The cycle fluid three of second level nested type Rankine cycle outer circulation exchanges heat, and carries out the further utilization of cold energy；From regenerator three
Flue gas out is the lower cold air of temperature, can be directly discharged into air-conditioning and refrigeration in atmosphere or for production district of living and set
It is standby that cold energy is provided；
(3) the twin-stage nested type Rankine cycle system course of work is cascaded：
A) cycle fluid one in level-one nested type Rankine cycle outer circulation forms air-flow after the evaporation of evaporator one
It is directly entered steam turbine one and carries out expansion work, the lack of gas one after acting sequentially enter evaporative condenser two, evaporative condenser one
Heat exchange, which is carried out, with the cycle fluid two in LNG and level-one nested type Rankine cycle in circulation realizes condensation, condensed circulation industrial
Matter one enters pump one and pressurizes, and the cycle fluid one after pressurization enters evaporator one and flue gas carries out heat exchange and realizes boil-off gas
Change, forms cycle operation state；
B) cycle fluid two in level-one nested type Rankine cycle in circulation forms air-flow after the evaporation of evaporator two
It is directly entered steam turbine two and carries out expansion work, the lack of gas two after acting enter regenerator one and come out from pump two by condensing
Cycle fluid two after pressurization carries out heat exchange and realizes pre-cooling, cycle fluid two after pre-cooling enter evaporative condenser two and LNG with
And the cycle fluid one in level-one nested type Rankine cycle outer circulation carry out heat exchange realize condensation, condensed cycle fluid two according to
Secondary to carry out pressurization preheating into pump two and regenerator one, the cycle fluid two after pressurization preheating enters evaporator two to carry out with flue gas
Evaporation gasification is realized in heat exchange, forms cycle operation state；
C) cycle fluid three in second level nested type Rankine cycle outer circulation forms air-flow after the evaporation of evaporator three
Be directly entered steam turbine three and carry out expansion work, lack of gas three after acting enter regenerator three with separated CO2Low temperature cigarette afterwards
Gas carries out heat exchange and realizes pre-cooling, cycle fluid three after pre-cooling successively by evaporative condenser four, evaporative condenser three and LNG into
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 cycle operation state；
D) cycle fluid four in second level nested type Rankine cycle in circulation forms air-flow after the evaporation of evaporator four
It is directly entered steam turbine four and carries out expansion work, the lack of gas four after acting enter regenerator two and add with the condensation come out from pump four
Cycle fluid four after pressure carries out heat exchange and realizes pre-cooling, and the cycle fluid four after pre-cooling enters evaporative condenser four and LNG and follows
Ring working medium three carries out heat exchange and realizes condensation, and condensed cycle fluid four enters four pressurization of pump, the cycle fluid four after pressurization according to
It is secondary to enter regenerator two, the progress endothermic gasification of evaporator four, form cycle operation state.
Beneficial effects of the present invention are：
1) present invention will cascade twin-stage Rankine cycle and nested type Rankine cycle combine 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
It is efficient using LNG cold energy recycling trapping magnesite melting flue gas in waste heat and CO2The 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, flue gas and the change of LNG can more be catered to by mixing organic matter working medium
Warm heat transfer characteristic effectively reduces irreversible loss of the system in heat transfer process；
3) it joined regenerative apparatus in integral system proposed by the present invention, reduce and recycled in Rankine cycle condensation process
Heat transfer temperature difference between working medium and cold source reduces the irreversible heat exchange loss in system in turn；
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 cold energy use rate is by original
11.8% is promoted to 19.71%,Efficiency is promoted by original 52% to 56.9%.
Detailed description of the invention
Fig. 1 is to recycle trapping magnesite melting fume afterheat and CO using LNG cold energy2System schematic.
Specific embodiment
Below by taking the flue gas that certain typical case LNG and In Dashiqiao Area magnesite smelting technology generate as an example, to the present invention into
One step specifically describes, but implementation of the invention is without being limited thereto, and operating parameter 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, recycling trapping magnesite melting fume afterheat and CO using LNG cold energy2System, including cascade is double
Grade nested type Rankine cycle system, LNG gasification system and CO2Trapping system, cascade twin-stage nested type Rankine cycle system include
Level-one nested type Rankine cycle outer circulation, circulation in the Rankine cycle of level-one nested type, second level nested type Rankine cycle outer circulation and
Circulation in the Rankine cycle of second level nested type, level-one nested type Rankine cycle outer circulation includes the pump 1 being sequentially connected, evaporator one
10, steam turbine 1, evaporative condenser 27 and evaporative condenser 1, the interior circulation of level-one nested type Rankine cycle includes successively
Connected pump 23, regenerator 1, evaporator 2 11, steam turbine 2 19, the regenerator 1 and the evaporative condenser two
7, second level nested type Rankine cycle outer circulation includes the pump 34 being sequentially connected, evaporator 3 12, steam turbine 3 20, regenerator three
16, evaporative condenser 49 and evaporative condenser 38, in the Rankine cycle of second level nested type circulation include the pump 45 being sequentially connected,
Regenerator 2 15, evaporator 4 13, steam turbine 4 21, the regenerator 2 15 and the evaporative condenser 49, LNG gasification system
System includes sequentially connected pump 51, the evaporative condenser 1, the evaporative condenser 27,38 and of the evaporative condenser
The evaporative condenser 49, CO2Trapping system includes the sequentially connected evaporator 4 13, the evaporator 3 12, described
Evaporator 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 4.17kg/s, temperature are -162 DEG C, pressure is
The LNG of 0.14MPa from storage tank flow out after be directly entered pump 51 pressurizeed after temperature, pressure be respectively -161.9 DEG C and
0.28MPa, the LNG after boosting enter one 6 pairs of cycle fluids one of evaporative condenser and condense, and the LNG temperature after heat absorption increases
It is -144.9 DEG C, LNG at this time is gas-liquid mixture phase, and and then LNG enters 27 pairs of two Hes of cycle fluid of evaporative condenser
Cycle fluid one is condensed, and further the temperature of the LNG after heat absorption becomes -94.84 DEG C, and LNG at this time is substantially at gas
State, then LNG enters 38 pairs of cycle fluids three of evaporative condenser and condenses, and after third time is absorbed heat, the temperature of LNG becomes
It is -94.07 DEG C, and then LNG enters 49 pairs of cycle fluids four of evaporative condenser and cycle fluid three condenses, by
The temperature of LNG reaches -30.31 DEG C after four heat absorptions, and LNG at this time has been gaseous state, and by further heating up plus smelly processing reaches
City gas transmission pipeline net work can be passed through after requiring to city gas transmission pipeline net work.
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 in evaporator 4 13 after fixed with the flow of 22.22kg/s 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, makes its steaming
Getting angry, flue-gas temperature is reduced to 10 DEG C after second of heat release, then flue gas enter 2 11 pairs of cycle fluids two of evaporator into
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
It carries out heat release to cycle fluid one to be vaporized, flue-gas temperature is reduced to -97.32 DEG C after the 4th heat release, at this time in flue gas
Part CO2Condensation liquefaction occurs, the flue gas of gas-liquid mixed state at this time is passed directly into gas-liquid separator 17, by liquid CO2Separation
It is stored as the CO trapped2Product, CO2Product yield is 4315kg/h, has separated part CO2Flue gas afterwards proceeds immediately to back
Hot device 3 16 is further using the cold energy in flue gas, and the flue-gas temperature come out from regenerator 3 16 is -61.82 DEG C, throughput
For 21.02kg/s, the air-conditioning and refrigerating equipment that can be used as a kind of cold air product supply periphery life production district 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
It is a nested type Rankine cycle on cold and hot energy direction of transfer.First in level-one nested type Rankine cycle outer circulation, follow
Ring working medium one is the mixture of methane and ethane, and the mass fraction of methane is 80%；From evaporator 1 come out temperature be-
43.81 DEG C, pressure be 0.8MPa cycle fluid one be directly entered steam turbine 1 carry out expansion work, the lack of gas one after acting
Temperature and pressure be respectively -80 DEG C and 0.4MPa, lack of gas sequentially enter evaporative condenser 27, evaporative condenser 1 and LNG
And the cycle fluid two in the Rankine cycle of level-one nested type in circulation carries out the condensation that mixed working fluid one is realized in heat exchange, it is condensed
Mixed working fluid one (temperature be -140 DEG C) enters pump 1 and pressurizes, and one temperature, pressure of mixed working fluid 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 evaporation gasification, so far
Level-one nested type Rankine cycle outer circulation is formed.
In the Rankine cycle of level-one nested type in circulation, cycle fluid two is the mixture of ethane and propylene, the quality of ethane
Score is 70%；The temperature, pressure come out from evaporator 2 11 be respectively -8.934 DEG C and 0.2MPa cycle fluids two directly into
Enter steam turbine 2 19 and carry out expansion work, two temperature, pressure of lack of gas after acting is respectively -30 DEG C and 0.1MPa, then lack of gas
Into regenerator 1 with from pump 23 come out by condensation pressurization after cycle fluid two carry out heat exchange realize pre-cooling, after pre-cooling
Two temperature of cycle fluid be -50 DEG C, proceed immediately to evaporative condenser 27 and LNG and cycle fluid one carry out heat exchange realization
Condensation, condensed Temperature of Working are -80 DEG C, are pressurizeed subsequently into pump 23, two pressure of cycle fluid after pressurization becomes
For 0.2MPa, proceeds immediately to regenerator 1 and preheated using the waste heat of lack of gas two, the temperature of the cycle fluid two after preheating
Degree is -66.58 DEG C, carries out heat exchange subsequently into evaporator 2 11 and flue gas and realizes evaporation gasification, so far level-one nested type Rankine
Circulation is formed in circulation.
In second level nested type Rankine cycle outer circulation, cycle fluid three is the mixture of propane and propylene, the matter of propylene
Measuring score is 50%；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, the temperature and pressure of the lack of gas three after acting is respectively -28 DEG C and 0.1MPa, then
Into regenerator 3 16 with separated CO2Low-temperature flue gas afterwards carries out heat exchange and realizes pre-cooling, three temperature of cycle fluid after pre-cooling
It is -60 DEG C, the cycle fluid three after pre-cooling is successively by evaporative condenser 49, evaporative condenser 38 and LNG and cycle fluid
Four, which carry out heat exchange, realizes condensation, and condensed three temperature of cycle fluid is -90 DEG C, pressurized treatments is carried out into pump 34, after pressurization
Three temperature, pressure of cycle fluid 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 second level nested type Rankine cycle outer circulation are formed.
In second level nested type Rankine cycle in circulation, 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 He 0.3MPa
Four, which are directly entered steam turbine 4 21, carries out expansion work, the temperature, pressures of the lack of gas four after acting be respectively -2.575 DEG C and
0.1MPa, then lack of gas four enter regenerator 2 15 and exchange heat with the cycle fluid four condensed after pressurizeing come out from pump 45
Realize pre-cooling, four temperature of cycle fluid after pre-cooling 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 condensed four temperature of cycle fluid is -80.10 DEG C, proceeds immediately to 45 pressurization of pump, adds
Four temperature, pressure of cycle fluid after pressure is respectively -80 DEG C and 0.3MPa, then sequentially enters regenerator 2 15, evaporator 4 13
Endothermic gasification is carried out, circulation is formed in so far second level nested type Rankine cycle.
Claims (3)
1. utilizing LNG cold energy recycling trapping magnesite melting fume afterheat and CO2System, which is characterized 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 include one
Circulation, second level nested type Rankine cycle outer circulation and two in grade nested type Rankine cycle outer circulation, the Rankine cycle of level-one nested type
Circulation in grade nested type Rankine cycle, level-one nested type Rankine cycle outer circulation includes the pump one being sequentially connected, evaporator one, vapour
Turbine one, evaporative condenser two and evaporative condenser one, in the Rankine cycle of level-one nested type circulation include the pump two being sequentially connected,
Regenerator one, evaporator two, steam turbine two, the regenerator one and the evaporative condenser two, second level nested type Rankine cycle
Outer circulation includes the pump three being sequentially connected, evaporator three, steam turbine three, regenerator three, evaporative condenser four and evaporative condenser
Three, in the Rankine cycle of second level nested type circulation include the pump four being sequentially connected, it is regenerator two, evaporator four, steam turbine four, described
Regenerator two and the evaporative condenser four, LNG gasification system include five, the evaporative condenser one, institute of sequentially connected pump
State evaporative condenser two, the evaporative condenser three and the evaporative condenser four, CO2Trapping system includes sequentially connected institute
State evaporator four, the evaporator three, the evaporator two, the evaporator one, gas-liquid separator and the regenerator three.
2. according to claim 1 utilize LNG cold energy recycling trapping magnesite melting fume afterheat and CO2System, it is special
Sign is that the cycle fluid one of level-one nested type Rankine cycle outer circulation is methane+ethane, follows in level-one nested type Rankine cycle
The cycle fluid two of ring is ethane+propylene, and the cycle fluid three of second level nested type Rankine cycle outer circulation is propylene+propane, two
The cycle fluid four recycled in grade nested type Rankine cycle is normal butane+pentane.
3. utilizing LNG cold energy recycling trapping magnesite melting fume afterheat and CO2Method, which is characterized in that wanted based on such as right
LNG cold energy recycling trapping magnesite melting fume afterheat and CO are utilized described in asking 22System, specifically include following process：
（1）LNG gasification：
From storage tank come out LNG be directly entered pump five carry out pressurized treatments, then sequentially enter evaporative condenser one, evaporation it is cold
Condenser two, evaporative condenser three, evaporative condenser four respectively with cascade twin-stage nested type Rankine cycle system cycle fluid one ~
Four exchange heat, and the evaporation gasification of itself, the day after final endothermic gasification are realized while condensation to cycle fluid one ~ tetra-
Right gas supplies gas network by further heating up plus after smelly processing reaches city gas transmission network temperature requirement；
（2）CO2Trapping：
The magnesite melting flue gas come out from gas storage holder has high temperature and pressure, and flue gas sequentially enters evaporator four, evaporator three
With the cycle fluid three of the cycle fluid four and second level nested type Rankine cycle outer circulation that are recycled in second level nested type Rankine cycle
It exchanges heat, realizes preliminary pre-cooling；It is bright that flue gas after pre-cooling sequentially enters evaporator two, evaporator one and level-one nested type
The cycle fluid one of the cycle fluid two and level-one nested type Rankine cycle outer circulation of agreeing the interior circulation of circulation carries out heat exchange and realizes CO2
Condensation, from evaporator one come out flue gas in part CO2It is condensed into liquid, which enters directly into gas
By liquid CO in liquid/gas separator2Product separation storage；Liquid CO is separated2It is embedding with second level that flue gas afterwards is directly entered regenerator three
The cycle fluid three of shell type Rankine cycle outer circulation exchanges heat, and carries out the further utilization of cold energy；It is come out from regenerator three
Flue gas is the lower cold air of temperature, can be directly discharged into air-conditioning and refrigerating equipment in atmosphere or for production district of living and provide
Cold energy；
（3）Cascade the twin-stage nested type Rankine cycle system course of work：
a）Cycle fluid one in level-one 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 lack of gas one after acting sequentially enter evaporative condenser two, evaporative condenser one and LNG
And the Rankine cycle of level-one nested type in circulation in cycle fluid two carry out heat exchange realize condensation, condensed cycle fluid one into
Enter pump one to pressurize, the cycle fluid one after pressurization enters evaporator one and flue gas carries out heat exchange and realizes evaporation gasification, is formed
Cycle operation state；
b）Cycle fluid two in level-one nested type Rankine cycle in circulation, formation air-flow is direct after the evaporation of evaporator two
Expansion work is carried out into steam turbine two, the lack of gas two after acting enter regenerator one and come out from pump two by condensation pressurization
Cycle fluid two afterwards carries out heat exchange and realizes pre-cooling, and the cycle fluid two after pre-cooling enters evaporative condenser two and LNG and one
Grade nested type Rankine cycle outer circulation in cycle fluid one carry out heat exchange realize condensation, condensed cycle fluid two successively into
Enter pump two and regenerator one carries out pressurization preheating, the cycle fluid two after pressurization preheating exchanges heat into evaporator two with flue gas
It realizes evaporation gasification, forms cycle operation state；
c）Cycle fluid three in second level nested type Rankine cycle outer circulation, formation air-flow is direct after the evaporation of evaporator three
Carry out expansion work into steam turbine three, lack of gas three after acting enter regenerator three with separated CO2Low-temperature flue gas afterwards into
Pre-cooling is realized in row heat exchange, and the cycle fluid three after pre-cooling is successively changed by evaporative condenser four, evaporative condenser three and LNG
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 and flue gas carry out heat exchange and realize evaporation gasification, form cycle operation state；
d）Cycle fluid four in second level nested type Rankine cycle in circulation, formation air-flow is direct after the evaporation of evaporator four
Expansion work is carried out into steam turbine four, the lack of gas four after acting enter regenerator two and after the condensation pressurization that pump four comes out
Cycle fluid four carries out heat exchange and realizes pre-cooling, and the cycle fluid four after pre-cooling enters evaporative condenser four and LNG and cycle fluid
Three, which carry out heat exchange, realizes condensation, and condensed cycle fluid four enters four pressurization of pump, and the cycle fluid four after pressurization sequentially enters
Regenerator two, evaporator four carry out endothermic gasification, form cycle operation state.
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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 |
| CN113883739B (en) * | 2021-09-29 | 2022-06-07 | 西安交通大学 | CO of composite absorption refrigeration and organic Rankine cycle2Pressure-increasing storage device |
| CN114109541B (en) * | 2021-11-24 | 2023-10-27 | 江苏科技大学 | Cold energy full power generation and utilization system of LNG fuel power ship |
| 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 |
| CN114686281B (en) * | 2022-03-17 | 2023-06-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-carbon heat recovery trapping device |
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| CN104948246A (en) * | 2015-06-18 | 2015-09-30 | 东北大学 | Method for capturing carbon dioxide in mineral smelting waste gas by making use of liquefied natural gas (LNG) cold energy |
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| CN206158809U (en) * | 2016-09-19 | 2017-05-10 | 青岛科技大学 | System is used multipurposely to LNG power boat's cold energy |
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| CN106150579A (en) * | 2015-04-20 | 2016-11-23 | 中国海洋石油总公司 | A kind of horizontal two grade utility LNG Trans-critical cycle cold energy Rankine cycle electricity generation system |
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