CN211174244U - L NG cold energy power generation and ice making gradient utilization system - Google Patents
L NG cold energy power generation and ice making gradient utilization system Download PDFInfo
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- CN211174244U CN211174244U CN202020164099.XU CN202020164099U CN211174244U CN 211174244 U CN211174244 U CN 211174244U CN 202020164099 U CN202020164099 U CN 202020164099U CN 211174244 U CN211174244 U CN 211174244U
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Abstract
the utility model belongs to the technical field of L NG cold energy power generation, concretely relates to L NG cold energy power generation and ice-making gradient utilization system, the system comprises a first Rankine cycle and a second Rankine cycle, a multistage refrigeration house system, first and second Rankine cycle working media are respectively used as a cold source and a heat source of a second heat exchanger, an L NG feeding pipeline is connected with the first Rankine cycle and then connected in series to the multistage refrigeration house system, the first Rankine cycle comprises a first heat exchanger, a first working medium pump, a second heat exchanger, a first turbine and a first generator connected with the first turbine which are sequentially connected, the L NG feeding pipeline is connected with the first heat exchanger, the L NG and the first Rankine cycle working medium are respectively used as a cold source and a heat source of the first heat exchanger, the second Rankine cycle comprises a second heat exchanger, a second working medium pump, a third heat exchanger, a second turbine and a second generator connected with the second turbine which are sequentially connected, the system carries out gradient utilization on L NG cold energy, and the L NG cold energy is utilized to the utmost extent.
Description
Technical Field
the utility model belongs to the technical field of the electricity generation of L NG cold energy, more specifically relates to an electricity generation of L NG cold energy and system ice gradient utilization system.
Background
by 9 months in 2018, 20L NG (liquefied natural gas) receiving stations which are built and put into production in China (no harbor, Australia and Taiwan regions) are provided, the total scale of the receiving stations is 6540 ten thousand tons/year, 64L NG receiving stations which are built and proposed are provided, 51L NG receiving stations which are planned in the early stage are provided, the L NG receiving stations are distributed in coastal provinces of China, the inlet amount of the L NG is increased continuously, and the problem of large waste of L NG cold energy is caused.
As can be seen from the figures 1 and 2, the single-stage Rankine cycle cold energy power generation system is simple in process, but low in efficiency and low in power generation amount, and the series double-stage Rankine cycle cold energy power generation system is more complex than the single-stage Rankine cycle cold energy power generation system, but high in power generation amount.
on this basis, the utility model provides an improve L NG cold energy electricity generation and system ice gradient utilization system of L NG cold energy utilization ratio.
SUMMERY OF THE UTILITY MODEL
the utility model aims at providing an improve L NG cold energy electricity generation and system ice gradient utilization system of L NG cold energy utilization ratio.
in order to achieve the aim, the utility model provides an L NG cold energy power generation and ice making gradient utilization system, which comprises a first Rankine cycle, a second Rankine cycle and a multistage refrigeration house system, wherein the first Rankine cycle and the second Rankine cycle are nested with each other and share a second heat exchanger, and a first Rankine cycle working medium and a second Rankine cycle working medium are respectively used as a cold source and a heat source of the second heat exchanger;
the first Rankine cycle comprises a first heat exchanger, a first working medium pump, a second heat exchanger, a first turbine and a first generator connected with the first turbine which are sequentially connected, wherein an L NG feeding pipeline is connected with the first heat exchanger, and the L NG and the first Rankine cycle working medium are respectively used as a cold source and a heat source of the first heat exchanger;
The second Rankine cycle includes, connected in series: the second heat exchanger, the second working medium pump, the third heat exchanger, the second turbine and a second generator connected with the second turbine.
The utility model discloses an in a specific embodiment, third heat exchanger and hot-water pipe network, sea water pipe network or the waste heat pipe network intercommunication of mill to utilize hot water, sea water or the waste heat of mill as the heat source of third heat exchanger.
In a preferred embodiment of the present invention, the first rankine cycle further includes: a first buffer tank and a second buffer tank; the first buffer tank is arranged between the first heat exchanger and the first working medium pump; the second buffer tank is disposed between the second heat exchanger and the first turbine; and the liquid outlet of the second buffer tank is communicated with the inlet end of the first buffer tank.
In an embodiment of the present invention, the second rankine cycle further includes: a third buffer tank and a fourth buffer tank; the third buffer tank is arranged between the second heat exchanger and the second working medium pump; the fourth buffer tank is disposed between the third heat exchanger and the second turbine; and the liquid outlet of the fourth buffer tank is communicated with the inlet end of the third buffer tank.
the utility model discloses an in preferred embodiment, multistage freezer system includes refrigeration pump, one-level evaporimeter, second grade evaporimeter, tertiary evaporimeter and the fourth heat exchanger that end to end connects in order, the L NG feed line with first heat exchanger is connected the back and is established ties to the fourth heat exchanger.
In a more specific embodiment of the present invention, the refrigerant medium is ammonia.
The utility model provides a working medium that first rankine cycle working medium and second rankine cycle working medium can adopt the field working medium commonly used. For example, the first rankine cycle working fluid is ethylene; and the second Rankine cycle working medium is propane.
the utility model provides a system is utilized to L NG cold energy electricity generation and system ice gradient realizes that first rankine cycle is nested with second rankine cycle through sharing second heat exchanger, and high-grade L NG cold energy is used for the electricity generation, and low-grade L NG cold energy is used for multistage freezer system refrigeration, carries out the step to L NG cold energy and utilizes, furthest has utilized L NG cold energy, the construction investment, running cost and the area of the L NG gasification equipment in the L NG receiving station that has significantly reduced.
the utility model provides a system is utilized to L NG cold energy electricity generation and system ice gradient, through the L NG cold energy for turbine power generation and the refrigeration of multistage freezer system in proper order after, L NG gasification is the natural gas, and its temperature reaches the leaving factory temperature.
the utility model provides a L NG cold energy electricity generation and system ice gradient utilize system can adopt the hot water or the mill's waste heat that close on the mill as the heat source, can reduce the construction investment that the comdenstion water heaies up or mill's waste heat treatment, realizes the energy saving and emission reduction of mill.
the utility model provides a L NG cold energy electricity generation and system ice gradient utilization system, reasonable high-efficient utilization L NG cold energy reduces the investment, creates the benefit, reduces the investment that closes on the mill simultaneously, can wide application in L NG cold energy electricity generation and freezer field.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.
FIG. 1 shows a schematic diagram of a prior art single-stage Rankine cycle cold energy power generation system.
Fig. 2 shows a schematic diagram of a prior art series two-stage rankine cycle cold energy power generation system.
fig. 3 shows a schematic diagram of the L NG cold energy power generation and ice making gradient utilization system provided by the present invention.
Description of the reference numerals
E-301, a first heat exchanger;
E-302, a second heat exchanger;
E-303, a third heat exchanger;
E-304, a fourth heat exchanger;
P-301, a first working medium pump;
P-302, a second working medium pump;
P-303, a refrigeration pump;
EX-301, first turbine;
EX-302, second turbine;
G-301, a first generator;
G-302, a second generator;
D-301, a first buffer tank;
D-302, a second buffer tank;
D-303, a third buffer tank;
D-304, a fourth buffer tank;
C. A multi-stage cold storage system;
C-301, a first-stage evaporator;
C-302, a secondary evaporator;
C-303, a three-stage evaporator;
1. A first Rankine cycle working medium;
2. A second Rankine cycle working medium;
3. A hot water pipe network, a seawater pipe network or a plant waste heat pipe network;
4. A refrigerant medium.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein.
referring to fig. 3, the utility model provides a system for generating electricity by utilizing L NG cold energy and making ice gradient, which comprises a first Rankine cycle, a second Rankine cycle and a multi-stage refrigeration storage system C, wherein the first Rankine cycle and the second Rankine cycle are nested with each other and share a second heat exchanger E-302, a first Rankine cycle working medium 1 and a second Rankine cycle working medium 2 are respectively used as a cold source and a heat source of the second heat exchanger E-302, an L NG feeding pipeline is connected with the first Rankine cycle and then connected in series to the multi-stage refrigeration storage system C, the first Rankine cycle comprises a first heat exchanger E-301, a first working medium pump P-301, a second heat exchanger E-302 and a first turbine EX-301 which are sequentially connected, and a first generator G-301 connected with the first turbine EX-301, the L NG feeding pipeline is connected with the first heat exchanger E-301, the L NG and the first Rankine cycle 1 are respectively used as the first working medium pump E-301 and the heat source, the second Rankine cycle working medium pump E-302, the second Rankine cycle working medium pump P-301 and the second turbine-302 are sequentially connected with the second Rankine cycle working medium pump E-301 and the second working medium pump P-302.
it should be understood that L NG serves as a cold source of the first rankine cycle, the second rankine cycle working medium 2 serves as a heat source of the first rankine cycle, the first rankine cycle working medium 1 serves as a cold source of the second rankine cycle, and the second rankine cycle working medium 2 is condensed in the second heat exchanger E-302.
To improve safe and stable operation of the equipment in the first rankine cycle, please continue to refer to fig. 3, the first rankine cycle further comprises: a first buffer tank D-301 and a second buffer tank D-302; the first buffer tank D-301 is arranged between the first heat exchanger E-301 and the first working medium pump P-301; the second buffer tank D-302 is disposed between the second heat exchanger E-302 and the first turbine EX-301; the liquid outlet of the second buffer tank D-302 is communicated with the inlet end of the first buffer tank D-301. The first Rankine cycle working medium 1 is condensed by the first heat exchanger E-301, buffered and separated by the first buffer tank D-301, pressurized by the first working medium pump P-301, heated and gasified by the second heat exchanger E-302 and separated by the second buffer tank D-302, and then acts on the first turbine EX-301 to drive the first generator G-301 to generate power. And the first Rankine cycle working medium 1 which is not gasified in the second buffer tank D-302, namely the liquid first Rankine cycle working medium 1 is returned to the first buffer tank D-301 for cyclic utilization.
In order to improve the safe and stable operation of the equipment in the second rankine cycle, please continue to refer to fig. 3, the second rankine cycle further comprises: a third surge tank D-303 and a fourth surge tank D-304; the third buffer tank D-303 is arranged between the second heat exchanger E-302 and the second working medium pump P-302; the fourth buffer tank D-304 is disposed between the third heat exchanger E-303 and the second turbine EX-302; the liquid outlet of the fourth buffer tank D-304 is communicated with the inlet end of the third buffer tank D-303. And exchanging heat between a second Rankine cycle working medium 2 and a first Rankine cycle working medium 1 in the second heat exchanger E-302, condensing the working medium into liquid, pressurizing the liquid by the second working medium pump P-302, separating the liquid by a third buffer tank D-303, heating and gasifying the third heat exchanger E-303, further gasifying the third buffer tank D-304, and applying work to the second turbine EX-302 to drive the second generator G-301 to generate power. And the second Rankine cycle working medium 2 which is not gasified in the fourth buffer tank D-304, namely the liquid second Rankine cycle working medium 2 is returned to the third buffer tank D-303 for cyclic utilization.
the multistage refrigeration house system can be a three-stage refrigeration house system, specifically, referring to fig. 3, the multistage refrigeration house system C comprises a refrigeration pump P-303, a first-stage evaporator C-301, a second-stage evaporator C-302, a third-stage evaporator C-303 and a fourth heat exchanger E-304 which are sequentially connected end to end, and the L NG feeding pipeline is connected with the first heat exchanger E-301 and then connected to the fourth heat exchanger E-304 in series.
The refrigeration medium 4 of the multistage cold storage system can be ammonia and/or seawater and the like. Preferably, the refrigeration medium is ammonia.
Example 1
the system comprises a first Rankine cycle, a second Rankine cycle and a multi-stage refrigeration house system C, wherein the first Rankine cycle and the second Rankine cycle are nested with each other and share a second heat exchanger E-302, a first Rankine cycle working medium 1 and a second Rankine cycle working medium 2 are respectively used as a cold source and a heat source of the second heat exchanger E-302, and an L NG feeding pipeline is connected with the first Rankine cycle and then connected to the multi-stage refrigeration house system C in series.
the first Rankine cycle comprises a first heat exchanger E-301, a first buffer tank D-301, a first working medium pump P-301, a second heat exchanger E-302, a second buffer tank D-302, a first turbine EX-301 and a first generator G-301 connected with the first turbine EX-301, wherein the first heat exchanger E-301, the second buffer tank D-302, the first turbine EX-301 and the first Rankine cycle working medium 1 are sequentially connected, the L NG feeding pipeline is connected with the first heat exchanger E-301, and the L NG and the first Rankine cycle working medium 1 are respectively used as a cold source and a heat source of the first heat exchanger E-301.
The second Rankine cycle includes, connected in series: the second heat exchanger E-302, the third buffer tank D-303, the second working medium pump P-302, the third heat exchanger E-303, the fourth buffer tank D-304, the second turbine EX-302 and the second generator G-302 connected with the second turbine EX-302. And the third heat exchanger E-303 is communicated with a hot water pipe network, a seawater pipe network or a factory waste heat pipe network 3.
the multistage refrigeration house system C comprises a refrigeration pump P-303, a first-stage evaporator C-301, a second-stage evaporator C-302, a third-stage evaporator C-303 and a fourth heat exchanger E-304 which are sequentially connected end to end, the L NG feeding pipeline is connected with the first heat exchanger E-301 and then connected in series to the fourth heat exchanger E-304, and a refrigeration medium 4 of the multistage refrigeration house system C is ammonia.
Example 2
in the embodiment, the L NG of a certain L NG receiving station is used as a cold source for power generation and refrigeration of a multi-stage refrigeration storage system.
1. the temperature of the L NG after being pressurized by a high-pressure external delivery pump of a certain receiving station is-152.7 ℃, the pressure is 9.9MPaG, the cold source L NG exchanges heat with the first Rankine cycle working medium 1 ethylene in the first heat exchanger E-301, the temperature of the L NG is increased to-102 ℃, the ethylene is condensed from a gas state to a liquid state, the temperature is-105 ℃, the liquid ethylene is separated by the first buffer tank D-301, enters the first working medium pump P-301 and is pressurized to 800kPaG, then exchanges heat with the second Rankine cycle working medium 2 propane in the second heat exchanger E-302, the temperature of the ethylene is increased to-35 ℃ gas state, the propane is condensed to-36.1 ℃ liquid state, the gas ethylene enters the first turbine EX-301 after passing through the second buffer tank D-302 to drive the first generator G-301 to generate electricity, the pressure of the ethylene after acting is reduced to 40kPaG, the gas state ethylene and the cold source L NG again exchange heat to a liquid state through the first heat exchanger E-301, and are sequentially circulated.
2. The first rankine cycle nests the second rankine cycle. The first Rankine cycle working medium 1 ethylene and the second Rankine cycle working medium 2 propane are heated by the second heat exchanger E-302, after passing through the second heat exchanger E-302, the gaseous propane is condensed into a liquid state at minus 36.1 ℃, and then the liquid propane enters the second working medium pump P-302 after being separated by the third buffer tank D-303 and is pressurized to 1980 kPaG. The propane and seawater, hot water or the waste heat of a factory exchange heat through a third heat exchanger E-303. The propane was warmed to 60 ℃ in the gaseous state. The gaseous propane enters a second turbine EX-302 after passing through a fourth buffer tank D-304, and drives a second generator G-302 to generate electricity. The pressure of the propane after the work was done was reduced to 40kPaG, which was gaseous. The gaseous propane is then again heat exchanged with ethylene via a second heat exchanger E-302 and condensed to a liquid state. And circulating in sequence.
3. the cold source L NG after heat exchange and temperature rise with ethylene exchanges heat with the 4 ammonia refrigeration medium in the fourth heat exchanger E-304, the NG is heated to 1.5 ℃ to reach the delivery temperature, the 4 ammonia refrigeration medium in the gas state at 5 ℃ is condensed and cooled to be in the liquid state at minus 35 ℃, the liquid ammonia is pressurized to 100kPaG through the refrigeration pump P-303, the pressurized liquid ammonia sequentially passes through the first-stage evaporator C-301, the second-stage evaporator C-302 and the third-stage evaporator C-303, evaporators in different grades are controlled to be in different temperature gradients, the liquid ammonia is changed into the 5 ℃ gas ammonia after the three-stage evaporation, and then exchanges heat with the L NG in the fourth heat exchanger E-304 and circulates sequentially.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. an L NG cold energy power generation and ice making gradient utilization system is characterized by comprising a first Rankine cycle, a second Rankine cycle and a multi-stage refrigeration house system (C), wherein the first Rankine cycle and the second Rankine cycle are nested with each other and share a second heat exchanger (E-302), a first Rankine cycle working medium and a second Rankine cycle working medium are respectively used as a cold source and a heat source of the second heat exchanger (E-302), an L NG feeding pipeline is connected with the first Rankine cycle and then connected to the multi-stage refrigeration house system (C) in series;
the first Rankine cycle comprises a first heat exchanger (E-301), a first working medium pump (P-301), a second heat exchanger (E-302), a first turbine (EX-301) and a first generator (G-301) connected with the first turbine (EX-301), wherein the first Rankine cycle is sequentially connected with the first heat exchanger (E-301), the L NG feeding pipeline is connected with the first heat exchanger (E-301), and the L NG and the first Rankine cycle working medium are respectively used as a cold source and a heat source of the first heat exchanger (E-301);
The second Rankine cycle includes, connected in series: the second heat exchanger (E-302), the second working medium pump (P-302), the third heat exchanger (E-303) and the second turbine (EX-302), and the second generator (G-302) connected with the second turbine (EX-302).
2. The system according to claim 1, characterized in that said third heat exchanger (E-303) is in communication with a hot water pipe network, a sea water pipe network or a plant waste heat pipe network.
3. The system of claim 2, wherein the first rankine cycle further comprises: a first buffer tank (D-301) and a second buffer tank (D-302); the first buffer tank (D-301) is arranged between the first heat exchanger (E-301) and the first working medium pump (P-301); the second buffer tank (D-302) is arranged between the second heat exchanger (E-302) and the first turbine (EX-301); the liquid outlet of the second buffer tank (D-302) is communicated with the inlet end of the first buffer tank (D-301).
4. The system of claim 3, wherein the second Rankine cycle further comprises: a third buffer tank (D-303) and a fourth buffer tank (D-304); the third buffer tank (D-303) is arranged between the second heat exchanger (E-302) and the second working medium pump (P-302); the fourth buffer tank (D-304) is disposed between the third heat exchanger (E-303) and the second turbine (EX-302); the liquid outlet of the fourth buffer tank (D-304) is communicated with the inlet end of the third buffer tank (D-303).
5. the system according to any one of claims 1 to 4, wherein the multistage refrigeration storage system (C) comprises a refrigeration pump (P-303), a first-stage evaporator (C-301), a second-stage evaporator (C-302), a third-stage evaporator (C-303) and a fourth heat exchanger (E-304) which are connected end to end in sequence, and the L NG feed line is connected with the first heat exchanger (E-301) and then connected in series with the fourth heat exchanger (E-304).
6. The system according to claim 5, characterized in that the refrigeration medium of the multistage cold storage system (C) is ammonia.
7. The system of any of claims 1-4, wherein the first Rankine cycle working fluid is ethylene; and the second Rankine cycle working medium is propane.
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| CN202020164099.XU CN211174244U (en) | 2020-02-12 | 2020-02-12 | L NG cold energy power generation and ice making gradient utilization system |
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| CN202020164099.XU CN211174244U (en) | 2020-02-12 | 2020-02-12 | L NG cold energy power generation and ice making gradient utilization system |
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