CN209925092U - LNG gas turbine coupling cold energy power generation system - Google Patents
LNG gas turbine coupling cold energy power generation system Download PDFInfo
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- CN209925092U CN209925092U CN201920406892.3U CN201920406892U CN209925092U CN 209925092 U CN209925092 U CN 209925092U CN 201920406892 U CN201920406892 U CN 201920406892U CN 209925092 U CN209925092 U CN 209925092U
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Abstract
The utility model discloses a LNG gas turbine coupling cold energy power generation system, include: the liquefied natural gas storage device is used for storing liquefied natural gas; the liquefied natural gas cold energy power generation system is connected with the liquefied natural gas storage device and is used for generating power by utilizing the liquefied natural gas cold energy; the gas turbine power generation system is connected with the liquefied natural gas storage device and used for generating power by utilizing the combustion of natural gas; the flue gas discharged by the gas turbine power generation system is used for heating liquid or gaseous natural gas or liquid natural gas cold energy power generation circulating working medium. The system utilizes the waste heat of the flue gas of the gas turbine to increase the average heat absorption temperature of the additional cycle working medium power generation system by more than 50 ℃, so that the cycle cold energy power generation efficiency of the additional working medium can be increased by more than 20%; the higher power generation efficiency and the larger power generation amount are realized; the LNG and the low-temperature natural gas are heated by using the waste heat of the flue gas of the gas turbine, so that the LNG and the low-temperature natural gas are gasified and heated, energy is saved, and the power generation efficiency is improved.
Description
Technical Field
The utility model relates to a new forms of energy field, concretely relates to LNG gas turbine coupling cold energy power generation system.
Background
According to the medium and long term development and planning of energy in China, natural gas becomes one of bright spots and green energy pillars of the energy development strategy in China. In the future, China will import a large amount of natural gas, and most of the natural gas is transported to China in a Liquefied Natural Gas (LNG) mode. A large amount of imported LNG carries a large amount of cold energy at the same time, and if the cold energy cannot be effectively utilized, huge energy waste and environmental pollution will be caused. Therefore, how to effectively utilize the cold energy becomes very important and necessary. On one hand, the high-grade cold energy of the LNG can be effectively utilized to generate electricity by utilizing the cold energy of the LNG; on the other hand, the method not only has no consumption on natural gas, but also can reduce the environmental pollution in the LNG gasification process while obtaining great economic benefit. The method is very necessary for accelerating the breadth and depth of natural gas in the energy consumption structure of China, improving the energy utilization efficiency of LNG and realizing national sustainable development. However, the prior art and the method have the disadvantages of low power generation efficiency and complex system and equipment structure, and the expansion method is only suitable for the working condition with high-pressure LNG and cannot be used for a low-pressure LNG system.
On the other hand, when the exhaust gas temperature of the gas turbine is too high, a waste heat boiler is generally arranged to produce high-pressure steam, and then the high-pressure steam is brought to the steam turbine to increase the power generation amount. Even though the waste heat boiler absorbs heat, the temperature of the flue gas finally discharged to a chimney of a common gas-steam combined cycle power generation device is about 100 ℃, and a large amount of waste heat is not applied.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
The utility model aims at providing a LNG gas turbine coupling cold energy power generation system is in order to solve above-mentioned problem.
(II) technical scheme
In order to solve the above problem, a first aspect of the present invention provides an LNG gas turbine coupled cold energy power generation system, including: the liquefied natural gas storage device is used for storing liquefied natural gas; the liquefied natural gas cold energy power generation system is connected with the liquefied natural gas storage device and is used for generating power by utilizing the liquefied natural gas cold energy; the gas turbine power generation system is connected with the liquefied natural gas storage device and used for generating power by utilizing the combustion of natural gas; and the flue gas discharged by the gas turbine power generation system is used for heating liquid or gaseous natural gas or liquid natural gas cold energy power generation circulating working medium.
Further, the liquefied natural gas cold energy power generation system comprises a condenser, a turbine, a first heater and a first generator; the liquefied natural gas storage device is communicated with a pipe side inlet of the condenser to supply liquefied natural gas, a pipe side outlet of the condenser is communicated with a gas turbine gas supply pipeline of the gas turbine power generation system, a shell side inlet of the condenser is communicated with an exhaust port of the turbine, a shell side outlet of the condenser is communicated with a supercharging device, the supercharging device is communicated with an inlet of the first heater, an outlet of the first heater is communicated with a gas inlet end of the turbine, and a circulating working medium is supercharged and heated by the first heater to be changed into a gas-phase superheated high-pressure working medium to enter the turbine to expand to do work; the turbine drives the first generator to rotate to generate electricity.
Furthermore, the first heater heating pipeline is communicated with a flue gas pipeline of the gas turbine power generation system, and the circulating working medium is heated by using the flue gas waste heat of the gas turbine.
Further, the circulating working medium is any one of propane, ammonia, propylene, tetrafluoroethane, carbon dioxide and nitrogen, and the working medium cycle is a Rankine cycle or a low-temperature Brayton cycle.
Further, the liquefied natural gas cold energy power generation system further comprises a second heater, an expander and a second generator; the second heater tube side inlet is in communication with the lng storage device and the second heater tube side outlet is in communication with the inlet of the expander; the second heater is used for heating natural gas, and an outlet of the expansion machine is connected with the gas turbine gas supply pipeline; the expander is connected with the second generator and used for driving the second generator to generate electricity by utilizing the rotating mechanical energy generated by natural gas expansion.
Furthermore, the heating pipeline of the second heater is communicated with a flue gas pipeline of the gas turbine power generation system, and the natural gas is heated by using the flue gas waste heat of the gas turbine.
Further, the liquefied natural gas cold energy power generation system comprises: a second heater, an expander and a second generator; the inlet of the pipe side of the second heater is communicated with the outlet of the pipe side of the condenser, the outlet of the pipe side of the second heater is communicated with the inlet of the expansion machine, the second heater is used for heating natural gas, the expansion machine is connected with the second generator and used for driving the second generator to generate electricity by utilizing the rotating mechanical energy generated by the expansion of the natural gas, and the exhaust outlet of the expansion machine is connected with the air supply pipeline of the gas turbine; the expander is connected with the second generator and is used for driving the second generator to generate electricity by utilizing the rotating mechanical energy generated by natural gas expansion; and the shell side heat source of the second heater is communicated with a flue gas pipeline of a gas turbine of the gas turbine power generation system, and the natural gas is heated by using the flue gas waste heat of the gas turbine.
Further, the device also comprises an air cooling device; the air cooling device is arranged at an air inlet of the gas turbine power generation system, and is communicated with the liquefied natural gas storage device and used for cooling air by utilizing low-temperature natural gas.
(III) advantageous effects
The above technical scheme of the utility model has following profitable technological effect:
(1) the heat absorption average temperature of the additional cycle working medium power generation system is increased by more than 50 ℃ by using the waste heat of the flue gas of the gas turbine, so that the cycle cold energy power generation efficiency of the additional working medium can be increased by more than 20%;
(2) any one or combination of more of an expansion generator set, a Rankine cycle cold energy power generation system or a low-temperature Brayton cycle cold energy power generation system is utilized to realize higher power generation efficiency and larger power generation amount;
(3) the LNG and the low-temperature natural gas are heated by using the waste heat of the flue gas of the gas turbine, so that the LNG and the low-temperature natural gas are gasified and heated, energy is saved, and the power generation efficiency is improved;
(4) the LNG cold energy can also be utilized to reduce the temperature of compressed air entering a combustion chamber from a compressor, and the power generation efficiency of the gas turbine can also be increased.
Drawings
Fig. 1 is a schematic structural diagram of an LNG gas turbine coupled cold energy power generation system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an LNG gas turbine coupled cold energy power generation system according to an alternative embodiment of the present invention.
Reference numerals:
1: a liquefied natural gas storage device; 2: a liquefied natural gas cold energy power generation system; 3: a gas turbine power generation system; 4: a waste heat boiler; 21: a condenser; 22: a turbine; 23: a first heater; 24: a first generator; 25: a second heater; 26: an expander; 27: a second generator; 28: a third heater; 31: a compressor; 32: a combustion chamber; 33: a gas turbine; 34: an electric generator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
A schematic diagram of a layer structure according to an embodiment of the invention is shown in the drawing. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.
It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The utility model discloses a first aspect of the embodiment provides a LNG gas turbine coupling cold energy power generation system, include: a liquefied natural gas storage apparatus 1 for storing liquefied natural gas; the liquefied natural gas cold energy power generation system 2 is connected with the liquefied natural gas storage device 1 and is used for generating power by utilizing the liquefied natural gas cold energy; the gas turbine power generation system 3 is connected with the liquefied natural gas storage device 1 and is used for generating power by utilizing the combustion of natural gas; the flue gas discharged by the gas turbine power generation system 3 is used for heating liquid or gaseous natural gas or liquid natural gas cold energy power generation circulating working medium. The system utilizes the waste heat of the flue gas of the gas turbine to heat the LNG and the low-temperature natural gas, helps the LNG and the low-temperature natural gas to be gasified and heated, saves energy and improves the power generation efficiency.
Optionally, the lng cold energy power generation system 2 includes a condenser 21, a turbine 22, a first heater 23, and a first generator 24; the liquefied natural gas storage device 1 is communicated with a pipe side inlet of the condenser 21 to supply liquefied natural gas, a pipe side outlet of the condenser 21 is communicated with a gas turbine 33 gas supply pipeline of the gas turbine power generation system 3, a shell side inlet of the condenser 21 is communicated with an exhaust port of the turbine 22, a shell side outlet of the condenser 21 is communicated with a pressure boosting device, the pressure boosting device is communicated with an inlet of the first heater 23, an outlet of the first heater 23 is communicated with a gas inlet end of the turbine 22, optionally, the pressure boosting device is a pressure boosting pump or a compressor, but not limited to the above example, after being pressurized and heated by the first heater 23, the circulating working medium is changed into a gas-phase superheated high-pressure working medium, and enters the turbine; the turbine 22 rotates a first generator 24 to generate electricity.
Optionally, the heating pipeline of the first heater 23 is communicated with a flue gas pipeline of the gas turbine power generation system 3, and the flue gas waste heat of the gas turbine 33 is used for heating the circulating working medium.
Optionally, the circulating working medium is any one of propane, ammonia, propylene, tetrafluoroethane, carbon dioxide and nitrogen, and the working medium cycle is Rankine cycle or low-temperature Brayton cycle.
Optionally, the lng cold energy power generation system 2 further includes a second heater 25, an expander 26 and a second generator 27; the pipe side inlet of the second heater 25 is communicated with the liquefied natural gas storage device 1, and the pipe side outlet of the second heater 25 is communicated with the inlet of the expander 26; the second heater 25 is used for heating natural gas, and the outlet of the expansion machine 26 is connected with a gas supply pipeline of a gas turbine 33; the expander 26 is connected to the second generator 27, and is configured to utilize the rotational mechanical energy generated by the expansion of the natural gas to drive the second generator 27 to generate electricity.
Optionally, the heating pipeline of the second heater 25 is communicated with a flue gas pipeline of the gas turbine power generation system 3, and the flue gas waste heat of the gas turbine 33 is used for heating the natural gas.
Optionally, a pipe-side inlet of the third heater 28 is communicated with an outlet of the expander 26, a pipe-side outlet of the third heater 28 is connected with a gas supply pipeline of the gas turbine 33, and the third heater 28 is used for further heating the natural gas after expansion, temperature reduction and work application.
Optionally, the lng cold energy power generation system 2 includes: a second heater 25, an expander 26, and a second generator 27; the pipe side inlet of the second heater 25 is communicated with the pipe side outlet of the condenser 21, the pipe side outlet of the second heater 25 is communicated with the inlet of the expander 26, the second heater 25 is used for heating natural gas, the expander 26 is connected with the second generator 27 and used for driving the second generator 27 to generate electricity by utilizing the rotating mechanical energy generated by the expansion of the natural gas, and the exhaust outlet of the expander 26 is connected with the air supply pipeline of the gas turbine 33; the expander 26 is connected with the second generator 27, and is used for driving the second generator 27 to generate electricity by using the rotational mechanical energy generated by the expansion of the natural gas; the shell side heat source of the second heater 25 is communicated with the flue gas pipeline of the gas turbine 33 of the gas turbine power generation system 3, and the natural gas is heated by using the flue gas waste heat of the gas turbine 33.
Optionally, the air cooling device is further included; the air cooling device is arranged at an air inlet of the gas turbine power generation system 3, and the air cooling device is communicated with the liquefied natural gas storage device 1 and used for cooling air by using low-temperature natural gas.
The utility model aims at protecting a LNG gas turbine coupling cold energy power generation system, include: a liquefied natural gas storage apparatus 1 for storing liquefied natural gas; the liquefied natural gas cold energy power generation system 2 is connected with the liquefied natural gas storage device 1 and is used for generating power by utilizing the liquefied natural gas cold energy; the gas turbine power generation system 3 is connected with the liquefied natural gas storage device 1 and is used for generating power by utilizing the combustion of natural gas; the flue gas discharged by the gas turbine power generation system 3 is used for heating the liquefied natural gas, so that the liquefied natural gas is gasified into gaseous natural gas. The heat absorption average temperature of the additional cycle working medium power generation system is increased by more than 50 ℃ by using the waste heat of the flue gas of the gas turbine, so that the cycle cold energy power generation efficiency of the additional working medium can be increased by more than 20%; the higher power generation efficiency and the larger power generation amount are realized; the LNG and the low-temperature natural gas are heated by using the waste heat of the flue gas of the gas turbine, so that the LNG and the low-temperature natural gas are gasified and heated, energy is saved, and the power generation efficiency is improved; the LNG cold energy can also be utilized to reduce the temperature of compressed air entering a combustion chamber from a compressor, and the power generation efficiency of the gas turbine can also be increased.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. An LNG gas turbine coupled cold energy power generation system, comprising:
a liquefied natural gas storage device (1) for storing liquefied natural gas;
the liquefied natural gas cold energy power generation system (2) is connected with the liquefied natural gas storage device (1) and is used for generating power by utilizing liquefied natural gas cold energy;
the gas turbine power generation system (3) is connected with the liquefied natural gas storage device (1) and is used for generating power by utilizing the combustion of natural gas;
and the flue gas discharged by the gas turbine power generation system (3) is used for heating liquid or gaseous natural gas or liquid natural gas cold energy power generation circulating working medium.
2. The system of claim 1, wherein the lng cold energy power generation system (2) comprises a condenser (21), a turbine (22), a first heater (23), and a first generator (24);
the liquefied natural gas storage device (1) is communicated with a pipe side inlet of the condenser (21) to supply liquefied natural gas, a pipe side outlet of the condenser (21) is communicated with a gas turbine (33) gas supply pipeline of the gas turbine power generation system (3), a shell side inlet of the condenser (21) is communicated with an exhaust port of the turbine (22), a shell side outlet of the condenser (21) is communicated with a supercharging device, the supercharging device is communicated with an inlet of the first heater (23), an outlet of the first heater (23) is communicated with an inlet end of the turbine (22), and a circulating working medium is supercharged and heated by the first heater (23) and then becomes a gas-phase superheated high-pressure working medium to enter the turbine (22) to be expanded to do work; the turbine (22) drives the first generator (24) to rotate so as to generate electricity.
3. The system according to claim 2, characterized in that the heating pipeline of the first heater (23) is communicated with a flue gas pipeline of the gas turbine power generation system (3), and the circulating working medium is heated by using the flue gas waste heat of a gas turbine (33).
4. The system of claim 2, wherein the working fluid is any one of propane, ammonia, propylene, tetrafluoroethane, carbon dioxide and nitrogen, and the working fluid cycle is a Rankine cycle or a low-temperature Brayton cycle.
5. The system according to any one of claims 2-4, wherein the LNG cold energy power generation system (2) further comprises a second heater (25), an expander (26), and a second generator (27);
the pipe side inlet of the second heater (25) is communicated with the liquefied natural gas storage device (1), and the pipe side outlet of the second heater (25) is communicated with the inlet of the expander (26); the second heater (25) is used for heating natural gas, and the outlet of the expansion machine (26) is connected with a gas supply pipeline of the gas turbine (33);
the expansion machine (26) is connected with the second generator (27) and is used for driving the second generator (27) to generate electricity by utilizing the rotational mechanical energy generated by the expansion of the natural gas.
6. The system according to claim 5, characterized in that the heating pipeline of the second heater (25) is communicated with a flue gas pipeline of the gas turbine power generation system (3), and natural gas is heated by using flue gas waste heat of a gas turbine (33).
7. The system according to claim 2, wherein the lng cold energy power generation system (2) comprises: a second heater (25), an expander (26), and a second generator (27);
the pipe side inlet of the second heater (25) is communicated with the pipe side outlet of the condenser (21), the pipe side outlet of the second heater (25) is communicated with the inlet of the expander (26), the second heater (25) is used for heating natural gas, the expander (26) is connected with the second generator (27) and is used for driving the second generator (27) to generate electricity by utilizing the rotational mechanical energy generated by the expansion of the natural gas, and the exhaust outlet of the expander (26) is connected with the air supply pipeline of the gas turbine (33);
the expansion machine (26) is connected with the second generator (27) and is used for driving the second generator (27) to generate electricity by utilizing the rotational mechanical energy generated by the expansion of the natural gas;
and the shell side heat sources of the second heaters (25) are communicated with a flue gas pipeline of a gas turbine (33) of the gas turbine power generation system (3), and the natural gas is heated by utilizing the flue gas waste heat of the gas turbine (33).
8. The system of claim 1, further comprising an air cooling device;
the air cooling device is arranged at an air inlet of the gas turbine power generation system (3), and is communicated with the liquefied natural gas storage device (1) and used for cooling air by utilizing low-temperature natural gas.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882292A (en) * | 2019-03-27 | 2019-06-14 | 赫普科技发展（北京）有限公司 | A kind of LNG gas turbine coupling cold energy generation system and electricity-generating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882292A (en) * | 2019-03-27 | 2019-06-14 | 赫普科技发展（北京）有限公司 | A kind of LNG gas turbine coupling cold energy generation system and electricity-generating method |
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