CN107725130A - A kind of overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system - Google Patents
A kind of overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system Download PDFInfo
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- CN107725130A CN107725130A CN201710904257.3A CN201710904257A CN107725130A CN 107725130 A CN107725130 A CN 107725130A CN 201710904257 A CN201710904257 A CN 201710904257A CN 107725130 A CN107725130 A CN 107725130A
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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
- F01K25/08—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 special vapours
- F01K25/10—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 special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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Abstract
The present invention relates to a kind of overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system, including a LNG circulating pumps, a sea water pump；Also include the one-level generator unit being sequentially distributed in longitudinal array, the one-level generator unit includes one-level evaporator, first turbine, first-stage condenser, the one-level working medium pump being sequentially connected；Two level generator unit, the two level generator unit include secondary evaporimeter, second turbine, two level current divider, secondary condenser, secondary mixer, the two level working medium pump for being in turn connected to form closed loop；Three-level generator unit, the three-level generator unit include three-level evaporator, three level steam turbines, three-level current divider, three-level condenser, three-level blender, the three-level working medium pump for being in turn connected to form closed loop.The advantage of the invention is that：The present invention is simple in construction, easy to use, can be widely applied to LNG cold energy generations field.
Description
Technical field
The present invention relates to LNG cold energy generation technical fields, more particularly to a kind of overcritical second diffluence formula longitudinal direction three-level is bright
Agree cycle generating system.
Background technology
Its high-efficiency cleaning of natural gas, because turns into the current global fastest-rising fuel of dosage, but because natural gas liquefaction needs
Consume substantial amounts of electric energy.In receiving terminal, LNG has the huge temperature difference with environment temperature, has a large amount of available cold energy.Due to
LNG-FSRU generally stay in away from land user sea, in order to which natural gas smoothly is transported into user by pipeline,
NG outlet pressures in FSRU systems are generally higher than land IFV system NG outlet pressures.Required according to U.S.'s LNG distribution pressures,
Natural gas long distance transportation will reach more than 7MPa, and now LNG has reached supercriticality, therefore IFV is again on most FSRU
LNG can gasify under supercritical gasification pressure in carburetion system.LNG cold energy generations are because its industrial chain is short, environmentally safe, base
This is not by external environment influences such as market, environment, transports and as one of maximally effective cold energy use mode.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of overcritical second diffluence formula that can reduce condenser damage
Longitudinal three-level Rankine cycle electricity generation system.
In order to solve the above technical problems, the technical scheme is that：A kind of overcritical second diffluence formula longitudinal direction three-level is bright
Agree cycle generating system, its innovative point is：Including a LNG circulating pumps, a sea water pump；
Also include what is be sequentially distributed in longitudinal array
One-level generator unit, the one-level generator unit include one-level evaporator, first turbine, the one-level condensation being sequentially connected
Device, one-level working medium pump and the one-level generating working medium circulated in the closed loop, wherein, the both ends of one-level evaporator are respectively provided with one
To one-level thermal source input, one-level thermal source output end, the one-level thermal source output end of its one end is connected with first turbine, and described one
The both ends of level condenser are respectively provided with a pair of one-level thermal source inputs, one-level thermal source output end, the one-level thermal source input of its one end
It is connected with first turbine, the one-level thermal source input of the other end is connected with LNG circulating pumps, one-level thermal source output end and one-level work
Matter pump is connected；
Two level generator unit, the two level generator unit connect the dual evaporation to form closed loop including passing sequentially through pipeline
Device, second turbine, two level current divider, secondary condenser, secondary mixer, two level working medium pump and circulated in the closed loop
Two level generating working medium, wherein, the both ends of secondary evaporimeter are respectively provided with a pair of secondary source of heat inputs, secondary source of heat output end,
The secondary source of heat input of its one end is connected with two level working medium pump, secondary source of heat output end and the second turbine phase of the other end
Even, two level current divider has an input, three output ends, and its input is connected with second turbine, one of output
End is connected with the one-level thermal source input of the one end that is connected in one-level evaporator with first turbine, and the secondary mixer has three
Individual input, an output end, one end of secondary condenser have two secondary source of heat inputs, a secondary source of heat output
End, and one of secondary source of heat input at the end is connected with another output end of two level current divider, another two level heat
Source input is connected with one-level working medium pump, and the other end of secondary condenser has a secondary source of heat input, two two level heat
Source output terminal, and the secondary source of heat input at the end and the one-level thermal source of the one end that is connected in first-stage condenser with first turbine are defeated
Go out end to be connected, one of secondary source of heat output end is connected with the one of input of secondary mixer, another two level heat
Source output terminal is connected with the one-level thermal source input of the one-level evaporator other end, and the one-level thermal source output at the one-level evaporator end
End is connected with another input of secondary mixer, and the output end of secondary mixer is connected with two level working medium pump；
Three-level generator unit, the three-level generator unit include pass sequentially through pipeline connect to be formed closed loop three-level evaporation
Device, three level steam turbines, three-level current divider, three-level condenser, three-level blender, three-level working medium pump and circulated in the closed loop
Three-level generating working medium, wherein, three-level blender has an output end, two inputs, its output end and three-level working medium pump
It is connected, one of input is connected with the secondary source of heat output end of the one end that is connected in secondary evaporimeter with two level working medium pump, and three
The both ends of level evaporator have two three-level thermal source inputs, two three-level thermal source output ends, a three-level of its one end respectively
Thermal source input is connected with three-level working medium pump, and another three-level thermal source input is connected with sea water pump, a three-level of the other end
Thermal source output end is connected with three level steam turbines, the three-level current divider have an input, two output ends, its input with
Three level steam turbines are connected, and one of output end inputs with the secondary source of heat of the one end that is connected in secondary evaporimeter with second turbine
End is connected, and one end of the three-level condenser is with two three-level thermal source inputs, a three-level thermal source output end, and the end
One of three-level thermal source input is connected with another output end of three-level current divider, another three-level thermal source input and two
The remaining output end of level shunt device is connected, the other end of three-level condenser have two three-level thermal source output ends, one three
Level thermal source input, and the three-level thermal source input at the end and the two level of the one end that is connected in secondary condenser with two level current divider are hot
Source output terminal is adjacent, and the one of three-level thermal source output end in an end output end remaining with secondary mixer is connected, separately
One three-level thermal source output end is connected with another output end of three-level blender.
Further, the one-level generating working medium uses R1150.
Further, the two level generating working medium uses R23.
Further, the three-level generating working medium uses R290.
The advantage of the invention is that：In the present invention, generated electricity by adding one in secondary condenser from one-level
The one-level generating working medium circulated in unit, so as to further be reclaimed to cold energy, so that system net output work increases, and
And because the heat transfer temperature difference of other two streams in one-level generating working medium and NG Temperature Difference Ratio secondary condenser is small, so reducing
The damage of secondary condenser, improve its efficiency.
By adding one two level generating working medium circulated in two level generator unit in three-level condenser, so as to
Further cold energy is reclaimed, so that system net output work increases, and due to two level generating working medium and the NG temperature difference
Heat transfer temperature difference than other two streams in three-level condenser is small, so reducing the damage of three-level condenser, improves it
Efficiency.
R1150, R23, R290 is respectively adopted as coolant media for generating working medium, with LNG temperature using more matching, is
Unite stable, securely and reliably, be easy to construct.
The present invention is simple in construction, easy to use, can be widely applied to LNG cold energy generations field.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the schematic diagram of the overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system of the present invention.
Embodiment
The following examples can make professional and technical personnel that the present invention be more fully understood, but therefore not send out this
It is bright to be limited among described scope of embodiments.
A kind of overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system as shown in Figure 1, including LNG circulations
Pump 1, a sea water pump 14.
Also include what is be sequentially distributed in longitudinal array
One-level generator unit, the one-level generator unit include pass sequentially through pipeline connect to be formed closed loop one-level evaporator 5,
First turbine 8, first-stage condenser 2, one-level working medium pump 11 and the one-level generating working medium circulated in the closed loop, wherein,
The both ends of one-level evaporator 5 are respectively provided with a pair of one-level thermal source inputs, one-level thermal source output end, the one-level thermal source output of its one end
End is connected with first turbine 8, and the both ends of first-stage condenser 2 are respectively provided with a pair of one-level thermal source inputs, one-level thermal source output end,
The one-level thermal source input of its one end is connected with first turbine 8, one-level thermal source input and the phase of LNG circulating pumps 1 of the other end
Even, one-level thermal source output end is connected with one-level working medium pump 11.
In above-mentioned generator unit, one-level generating working medium uses R1150.R1150 conducts are used for one-level generating working medium
Coolant media, with LNG temperature using more matching, system run all right, securely and reliably, it is easy to construct.
Two level generator unit, the two level generator unit connect the dual evaporation to form closed loop including passing sequentially through pipeline
Device 6, second turbine 9, two level current divider 16, secondary condenser 3, secondary mixer 18, two level working medium pump 12 and in the closed loop
The two level generating working medium circulated in loop, wherein, the both ends of secondary evaporimeter 6 are respectively provided with a pair of secondary source of heat inputs, two levels
Thermal source output end, the secondary source of heat input of its one end are connected with two level working medium pump 12, the secondary source of heat output end of the other end with
Second turbine 9 is connected, and two level current divider 16 has an input, three output ends, its input and the phase of second turbine 9
Even, one of output end is connected with the one-level thermal source input of the one end that is connected in one-level evaporator 5 with first turbine 8, and two
Level blender 18 has three inputs, an output end, one end of secondary condenser 3 have two secondary source of heat inputs,
One secondary source of heat output end, and another output end of one of secondary source of heat input at the end and two level current divider 16
It is connected, another secondary source of heat input is connected with one-level working medium pump 11, and the other end of secondary condenser 3 has a two level heat
Source input, two secondary source of heat output ends, and in the secondary source of heat input at the end and first-stage condenser 2 with first turbine
The 8 one-level thermal source output ends for being connected one end are connected, one of secondary source of heat output end and secondary mixer 18 one of those
Input is connected, and another secondary source of heat output end is connected with the one-level thermal source input of the other end of one-level evaporator 5, and one-level
The one-level thermal source output end at the end of evaporator 5 is connected with another input of secondary mixer 18, secondary mixer 18 it is defeated
Go out end with two level working medium pump to be connected.
In above-mentioned generator unit, two level generating working medium uses R23.For two level generating working medium using R23 as refrigerant
Medium, with LNG temperature using more matching, system run all right, securely and reliably, it is easy to construct.
Three-level generator unit, the three-level generator unit include pass sequentially through pipeline connect to be formed closed loop three-level evaporation
Device 7, three level steam turbines 10, three-level current divider 17, three-level condenser 4, three-level blender 15, three-level working medium pump 13 and in the closed loop
The three-level generating working medium circulated in loop, wherein, three-level blender 15 has an output end, two inputs, its output end
It is connected with three-level working medium pump 13, the two level of one of input and the one end that is connected in secondary evaporimeter 6 with two level working medium pump 12
Thermal source output end is connected, and the both ends of three-level evaporator 7 have two three-level thermal source inputs, two three-level thermal source outputs respectively
End, a three-level thermal source input of its one end are connected with three-level working medium pump 13, another three-level thermal source input and sea water pump
14 are connected, and a three-level thermal source output end of the other end is connected with three level steam turbines 10, and three-level current divider 17 has an input
End, two output ends, its input is connected with three level steam turbines 10, in one of output end and secondary evaporimeter 6 with two level
The be connected secondary source of heat input of one end of steam turbine 9 is connected, and there are two three-level thermals source to input for one end of the three-level condenser 4
Another of end, a three-level thermal source output end, and one of three-level thermal source input at the end and three-level current divider 17 are defeated
Go out end to be connected, 16 remaining output ends of another three-level thermal source input and two level current divider are connected, three-level condenser 4
The other end has two three-level thermal source output ends, a three-level thermal source input, and the three-level thermal source input and two level at the end
Be connected in condenser 3 with two level current divider 16 one end secondary source of heat output end it is adjacent, the one of three-level thermal source in the end is defeated
Go out end with 18 remaining output ends of secondary mixer to be connected, another three-level thermal source output end is another with three-level blender 15
One output end is connected.
In above-mentioned generator unit, three-level generating working medium uses R290.For three-level generating working medium using R290 as cold
Medium, with LNG temperature using more matching, system run all right, securely and reliably, it is easy to construct.
LNG passes through one-level generator unit, two level generator unit and three-level generator unit successively after the boosting of LNG circulating pumps 1,
Two level generating working medium and the one-level generating working medium in one-level generator unit, the day in two level generator unit in two level generator unit
Natural gas in right gas and three-level generator unit is exchanged heat, and seawater enters after the boosting of sea water pump 14 into three-level generator unit
Row heat exchange.
Operation principle：The present embodiment uses pressure as 0.5MPa, and temperature is -162 DEG C of liquefied natural gas, and treating capacity is
175t/h, its mole of composition are：Methane 95%, ethane 3%, propane 2%.Thermal source is seawater, pressure 0.15MPa, and temperature is
20℃。
In three-level generator unit, the three-level generating working medium R290 in the circulatory system is after the pressurization of three-level working medium pump 13
Into in evaporator 7,20 DEG C of seawater is turned into after the pressurization of sea water pump 14（0.75Mpa, 20.05 DEG C）Enter afterwards as thermal source
In three-level evaporator 7, liquid generating working medium R290 is heated up through level pressure in the three-level evaporator 7, i.e., with（20 DEG C, 0.75MPa）'s
Seawater is changed into gaseous state outflow three-level evaporator 7 after carrying out heat exchange, and gaseous state generating working medium R290 enters three-level steamer through pipeline
10 external work done of machine generates electricity, and the exhaust steam after generating working medium R290 actings enters three-level current divider 17 after the exclusion of three level steam turbines 10
It is divided into two parts, enters in the secondary evaporimeter 6 that a part enters in two level generator unit as thermal source with two level generating working medium R23
Row heat exchange, now R23 by（- 82.31 DEG C, 0.57MPa）State is changed into（- 45.55 DEG C, 0.57MPa）State；Another part R290
It is same as thermal source into the three-level condenser 4 in three-level generator unit, now LNG by（- 85.53 DEG C, 8MPa）State becomes
For（-45.55,8MPa）, final two parts generating working medium R290 reaches identical temperature, pressure（- 42.55 DEG C, 0.11MPa）, pass through
Three-level blender 15 enters three-level working medium pump 13, such circulating generation after mixing.
In two level generator unit, the liquid generating working medium R23 in two level working medium pump 18 enters secondary evaporimeter through pipeline
6, in secondary evaporimeter 6 after the heat of absorption three-level generator unit circulating generation working medium R290 release, it is changed into gaseous state through pipe
Road generates electricity into 9 external work done of second turbine, and exhaust steam of the generating working medium R290 in second turbine 9 after expansion work enters
Second-stage separator 16 divides to be entered in the one-level evaporator 5 in one-level generator unit for three parts, a part as thermal source, the part
The 0.62 of total flow is accounted for, now R1150 is by state（- 106.0 DEG C, 0.26MPa）It is changed into state（- 85.53 DEG C, 0.26MPa）, the
Two parts enter secondary condenser 3 as also thermal source, and now LNG is by state（- 107.6 DEG C, 8MPa）It is changed into state（- 85.5 DEG C,
8MPa）, last part still as thermal source enter three-level generator unit in three-level condenser 4 in, followed with three-level generator unit
A ring generating working medium R290 part is exchanged heat with NG together, from secondary condenser 3, three-level condenser 4 and dual evaporation
The generating working medium R23 flowed out in device 5 is flowed into two level working medium pump 12 after the mixing of secondary mixer 18 through pipeline, so circulation hair
Electricity.
In one-level generator unit, the liquid generating working medium R1150 in one-level working medium pump 11 enters two level generating list through pipeline
In secondary condenser 3 in member, enter secondary evaporimeter 5 after further absorbing natural gas cold energy, absorbed in secondary evaporimeter 5
After the heat that circulating generation working medium R23 discharges in two level generator unit, it is changed into gaseous state and enters first turbine 8 simultaneously externally through pipeline
Work done generates electricity, one-level generating working medium R1150 and steam turbine 8 in exhaust steam after expansion work enter in first-stage condenser 2, shape
State is（- 158 DEG C, 8MPa）LNG also enter first-stage condenser 2 and one-level generating working medium R1150 and carry out heat exchange and be changed into shape
State（- 107.6 DEG C, 8MPa）, one-level working medium pump 11 is flowed into from the one-level generating working medium R1150 that first-stage condenser 2 flows out through pipeline
In, such circulating generation.
Calculating system net output work is：4494.122kw, system effectiveness are：28.1%, the net output work of the invention system
3.9% is improved compared to the longitudinal three-level Rankine cycle electricity generation system of typical case, system effectiveness improves 4.0%.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, above-described embodiment and explanation
Merely illustrating the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also have
Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention
By appended claims and its equivalent thereof.
Claims (4)
- A kind of 1. overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system, it is characterised in that：Circulated including a LNG Pump, a sea water pump；Also include what is be sequentially distributed in longitudinal arrayOne-level generator unit, the one-level generator unit include one-level evaporator, first turbine, the one-level condensation being sequentially connected Device, one-level working medium pump and the one-level generating working medium circulated in the closed loop, wherein, the both ends of one-level evaporator are respectively provided with one To one-level thermal source input, one-level thermal source output end, the one-level thermal source output end of its one end is connected with first turbine, and described one The both ends of level condenser are respectively provided with a pair of one-level thermal source inputs, one-level thermal source output end, the one-level thermal source input of its one end It is connected with first turbine, the one-level thermal source input of the other end is connected with LNG circulating pumps, one-level thermal source output end and one-level work Matter pump is connected；Two level generator unit, the two level generator unit connect the dual evaporation to form closed loop including passing sequentially through pipeline Device, second turbine, two level current divider, secondary condenser, secondary mixer, two level working medium pump and circulated in the closed loop Two level generating working medium, wherein, the both ends of secondary evaporimeter are respectively provided with a pair of secondary source of heat inputs, secondary source of heat output end, The secondary source of heat input of its one end is connected with two level working medium pump, secondary source of heat output end and the second turbine phase of the other end Even, two level current divider has an input, three output ends, and its input is connected with second turbine, one of output End is connected with the one-level thermal source input of the one end that is connected in one-level evaporator with first turbine, and the secondary mixer has three Individual input, an output end, one end of secondary condenser have two secondary source of heat inputs, a secondary source of heat output End, and one of secondary source of heat input at the end is connected with another output end of two level current divider, another two level heat Source input is connected with one-level working medium pump, and the other end of secondary condenser has a secondary source of heat input, two two level heat Source output terminal, and the secondary source of heat input at the end and the one-level thermal source of the one end that is connected in first-stage condenser with first turbine are defeated Go out end to be connected, one of secondary source of heat output end is connected with the one of input of secondary mixer, another two level heat Source output terminal is connected with the one-level thermal source input of the one-level evaporator other end, and the one-level thermal source output at the one-level evaporator end End is connected with another input of secondary mixer, and the output end of secondary mixer is connected with two level working medium pump；Three-level generator unit, the three-level generator unit include pass sequentially through pipeline connect to be formed closed loop three-level evaporation Device, three level steam turbines, three-level current divider, three-level condenser, three-level blender, three-level working medium pump and circulated in the closed loop Three-level generating working medium, wherein, three-level blender has an output end, two inputs, its output end and three-level working medium pump It is connected, one of input is connected with the secondary source of heat output end of the one end that is connected in secondary evaporimeter with two level working medium pump, and three The both ends of level evaporator have two three-level thermal source inputs, two three-level thermal source output ends, a three-level of its one end respectively Thermal source input is connected with three-level working medium pump, and another three-level thermal source input is connected with sea water pump, a three-level of the other end Thermal source output end is connected with three level steam turbines, the three-level current divider have an input, two output ends, its input with Three level steam turbines are connected, and one of output end inputs with the secondary source of heat of the one end that is connected in secondary evaporimeter with second turbine End is connected, and one end of the three-level condenser is with two three-level thermal source inputs, a three-level thermal source output end, and the end One of three-level thermal source input is connected with another output end of three-level current divider, another three-level thermal source input and two The remaining output end of level shunt device is connected, the other end of three-level condenser have two three-level thermal source output ends, one three Level thermal source input, and the three-level thermal source input at the end and the two level of the one end that is connected in secondary condenser with two level current divider are hot Source output terminal is adjacent, and the one of three-level thermal source output end in an end output end remaining with secondary mixer is connected, separately One three-level thermal source output end is connected with another output end of three-level blender.
- 2. overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system according to claim 1, it is characterised in that： The one-level generating working medium uses R1150.
- 3. overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system according to claim 1, it is characterised in that： The two level generating working medium uses R23.
- 4. overcritical second diffluence formula longitudinal direction three-level Rankine cycle electricity generation system according to claim 1, it is characterised in that： The three-level generating working medium uses R290.
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| CN108751299A (en) * | 2018-05-30 | 2018-11-06 | 江苏科技大学 | LNG cold energy generations and seawater desalination system and its method of comprehensive utilization on a kind of FSRU |
| CN110107368A (en) * | 2019-06-11 | 2019-08-09 | 赫普科技发展（北京）有限公司 | Steam condensing method, steam and condensate system and electricity generation system |
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| CN111577418A (en) * | 2020-05-28 | 2020-08-25 | 中国船舶工业集团公司第七0八研究所 | Supercritical three-level cascade Rankine cycle power generation system on FSRU |
| CN111577416A (en) * | 2020-05-28 | 2020-08-25 | 中国船舶工业集团公司第七0八研究所 | Supercritical four-stage cascade Rankine cycle power generation system on FSRU |
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| CN111140300A (en) * | 2019-12-31 | 2020-05-12 | 华油天然气广元有限公司 | Energy recovery method for liquefied natural gas |
| CN111577418A (en) * | 2020-05-28 | 2020-08-25 | 中国船舶工业集团公司第七0八研究所 | Supercritical three-level cascade Rankine cycle power generation system on FSRU |
| CN111577416A (en) * | 2020-05-28 | 2020-08-25 | 中国船舶工业集团公司第七0八研究所 | Supercritical four-stage cascade Rankine cycle power generation system on FSRU |
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