CN210483829U - Coupling LNG cold energy power generation system of thermal power plant - Google Patents
Coupling LNG cold energy power generation system of thermal power plant Download PDFInfo
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- CN210483829U CN210483829U CN201920876942.4U CN201920876942U CN210483829U CN 210483829 U CN210483829 U CN 210483829U CN 201920876942 U CN201920876942 U CN 201920876942U CN 210483829 U CN210483829 U CN 210483829U
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Abstract
The utility model discloses a coupling LNG cold energy power generation system of thermal power plant, including the thermal power plant rankine cycle power generation system, still include LNG heater and LNG additional working medium cold energy power generation system, LNG additional working medium cold energy power generation system includes circulation working medium heater, turbine and circulation working medium condenser of end to end connection in proper order in order to circulate circulation working medium; the circulating working medium condenser is connected with the LNG heater and is used for gasifying and heating the LNG liquefied natural gas flowing to the LNG heater; the Rankine cycle power generation system of the thermal power plant is respectively connected with the cycle working medium heater and the LNG heater so as to utilize the cold source loss of the Rankine cycle power generation system of the thermal power plant to heat the cycle working medium in the cycle working medium heater and the natural gas in the LNG heater. The energy of make full use of rankine cycle power generation system cold source loss in this application can realize the abundant cyclic utilization of the energy, avoids causing under the prerequisite of influence to the environment, promotes the generating efficiency among two circulation power generation systems.
Description
Technical Field
The utility model relates to a cold energy power generation technical field, more specifically say, relate to a coupling LNG cold energy power generation system of thermal power plant.
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. The LNG cold energy is utilized for power generation, so that on one hand, the high-grade cold energy of the LNG can be effectively utilized; 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.
The LNG cold energy has the following purposes: the cold energy utilization scheme needs to be comprehensively analyzed according to various factors such as the process of the LNG receiving station, market conditions, energy utilization efficiency and the like. The electric energy is the most convenient and most widely used energy form in the market, so the LNG cold energy is used for a power generation system, the industrial chain is short, the LNG cold energy is basically not interfered by external factors, and other cold energy utilization modes are greatly influenced by factors such as environment, market and transportation.
At present, LNG cold energy power generation only utilizes LNG cold energy to cool a condenser with additional working medium circulation, or directly utilizes high pressure of LNG or natural hot gas to generate power through an expander, LNG gasification heating or evaporative heating of the additional circulating working medium are both heated by air or seawater, the heating temperature depends on the environment or the seawater temperature, and the existing system cannot realize heating at higher temperature. Therefore, the overall LNG cold energy power generation efficiency is not high, the equipment investment is huge, and the project recovery period is long.
However, in the existing power plant, more than 50% of the heat source loss is lost in the cooling tower or the seawater, which results in energy loss, so how to avoid energy loss is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a coupling LNG cold energy power generation system of thermal power plant with, this power generation system can make full use of cold and hot energy, avoids the energy loss, improves the efficiency of electricity generation, and can avoid causing the negative effects of sea water temperature rise.
In order to achieve the above object, the present invention provides the following technical solutions:
the Rankine cycle power generation system of the thermal power plant comprises a thermal power plant boiler, a steam turbine, a condenser and an LNG heater and an LNG additional working medium cold energy power generation system, wherein the thermal power plant boiler, the steam turbine and the condenser are sequentially connected end to circulate steam-water circulation, the condenser discharges heat lost by a cold source to cool steam discharged by the steam turbine to condense the steam, the steam turbine is used for driving a generator to generate electricity, and the LNG additional working medium cold energy power generation system comprises a circulating working medium heater, a turbine and a circulating working medium condenser which are sequentially connected end to circulate a circulating working medium; the circulating working medium condenser is connected with the LNG heater and is used for gasifying and heating the LNG liquefied natural gas flowing to the LNG heater;
the Rankine cycle power generation system of the thermal power plant is respectively connected with the cycle working medium heater and the LNG heater so as to heat the cycle working medium in the cycle working medium heater and the natural gas in the LNG heater by utilizing the cold source loss of the Rankine cycle power generation system of the thermal power plant.
Preferably, the LNG heater is provided with a first heat source working medium channel for carrying out heat exchange with the received natural gas, and the first heat source working medium channel is connected with a seawater or circulating water outlet of the condenser;
and/or the LNG heater is provided with a second heat source working medium channel for carrying out heat exchange with the received natural gas, and the second heat source working medium channel is connected with the steam exhaust channel of the steam turbine.
Preferably, the LNG heater is provided with a first heat source working medium channel for heating natural gas with seawater or circulating water, a seawater or circulating water outlet of the first heat source working medium channel is connected to an inlet of a cooling channel of the condenser, and the cooling channel is used for cooling exhaust steam of the steam turbine received by the condenser by using seawater or circulating water cooled by the natural gas in the LNG heater.
Preferably, the circulating working medium heater is provided with a first heat source circulating working medium channel and a second heat source circulating working medium channel which are used for carrying out heat exchange with the circulating working medium;
the first heat source circulating working medium channel is connected with a seawater or circulating water outlet of the condenser, and the second heat source circulating working medium channel is connected with a steam exhaust channel of the steam turbine.
Preferably, the second heat source circulating working medium channel is connected with a hot well inlet of the condenser so as to recover condensed water discharged by the steam turbine.
Preferably, an LNG liquefied natural gas inlet of the circulating working medium condenser is connected with an LNG storage tank, so that the LNG liquefied natural gas is absorbed and gasified in the circulating working medium condenser.
Preferably, a circulating working medium outlet of the circulating working medium condenser is provided with a booster pump for pumping the circulating working medium to the circulating working medium heater.
Preferably, the LNG heater is connected with an expander, and the expander is connected with a generator.
In leading-in LNG heater of waste heat that thermal power plant Rankine cycle power generation system generated in this application, utilize thermal power plant Rankine cycle power generation system's waste heat to heat the LNG heater, can make full use of thermal power plant Rankine cycle power generation system's cold source loss, among the prior art, thermal power plant Rankine cycle power generation system's cold source loss directly distributes away or lets in the sea water usually, causes the waste of cold source energy. The cold source loss is also used for heating the circulating working medium in the circulating working medium heater, the circulating working medium heater can be heated particularly, and power generation is realized by heating the circulating working medium in the LNG additional working medium cold energy power generation system, so that the cold source loss of the Rankine cycle power generation system of the thermal power plant can be utilized for heating the circulating working medium, on one hand, the cold source loss of the Rankine cycle power generation system of the thermal power plant is saved, energy loss is avoided, and on the other hand, the power generation efficiency of the LNG additional working medium cold energy power generation system is facilitated.
The energy of make full use of rankine cycle power generation system cold source loss in this application to LNG additional working medium cold energy power generation system's the working medium heating and the heating of LNG liquefied natural gas in the LNG heater, can realize the abundant cyclic utilization of the energy, under the prerequisite of avoiding causing the influence to the environment, promote the generating efficiency among two circulation power generation systems.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a first embodiment of the present invention;
fig. 2 is a schematic diagram of a second embodiment of the present invention.
In FIGS. 1-2:
the system comprises a boiler 1 of a thermal power plant, a steam turbine 2, a condenser 3, an LNG heater 4, a circulating working medium heater 5, a turbine 6, a circulating working medium condenser 7 and an LNG storage tank 8, wherein the heat engine is used for generating heat;
9 is circulating seawater, 10 is high pressure heater, 11 is low pressure heater, 12 is generator, and 13 is expander.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
The core of the utility model is to provide a coupling LNG cold energy power generation system and power generation method of thermal power plant, this power generation system can the cold and hot energy of make full use of, avoids the energy loss, improves the efficiency of electricity generation, and can avoid causing the negative effects of sea water temperature rise.
Referring to fig. 1 to 2, fig. 1 is a schematic diagram of a first embodiment of the present invention; fig. 2 is a schematic diagram of a second embodiment of the present invention. In fig. 1 and 2, the structure in which the high heater is written in the housing is a high-temperature heating furnace, and the structure in which the low heater is written in the housing is a low-temperature heating furnace.
The application provides a thermal power plant coupling LNG cold energy power generation system which comprises a thermal power plant Rankine cycle power generation system, wherein the thermal power plant Rankine cycle power generation system comprises a thermal power plant boiler 1, a steam turbine 2 and a condenser 3, wherein the thermal power plant boiler 1 is sequentially connected end to circulate steam and water, the steam turbine 2 is connected with the thermal power plant boiler 1, the condenser 3 is used for discharging heat lost by a cold source to cool steam discharged by the steam turbine to condense the steam, and the steam turbine is used for driving a generator to generate power; further comprising: the LNG additional working medium cold energy power generation system comprises a circulating working medium heater 5, a turbine 6 and a circulating working medium condenser 7 which are sequentially connected end to circulate the circulating working medium; the circulating working medium condenser 7 is connected with the LNG heater 4 and is used for heating LNG liquefied natural gas flowing to the LNG heater 4;
the Rankine cycle power generation system of the thermal power plant is respectively connected with the cycle working medium heater 5 and the LNG heater 4 so as to utilize the cold source loss of the Rankine cycle power generation system of the thermal power plant to heat the cycle working medium in the cycle working medium heater 5 and the natural gas in the LNG heater 4.
It should be noted that the rankine cycle power generation system of the thermal power plant comprises a boiler 1 of the thermal power plant, a steam turbine 2, a condenser 3 and a generator, wherein an air inlet of the steam turbine 2 is connected to an air outlet of the boiler 1 of the thermal power plant for conveying high-temperature gas to the steam turbine 2, an outlet of the steam turbine 2 is connected with the condenser 3, so that the gas after doing work enters the condenser 3, the condenser 3 can cool the gas, condensation is realized, and a liquid or gas outlet of the condenser 3 is connected with the boiler so as to provide low-temperature water vapor for the boiler. During the circulation, the utilization of the energy of the exhaust gas of the boiler can be realized.
The LNG heater 4 is a heating structure connected to the outside of the LNG-LNG storage device, and is configured to obtain LNG-LNG and raise the temperature of the LNG-LNG to make it gaseous LNG, so as to supply natural gas to the outside.
The LNG additional working medium cold energy power generation system is a structure for generating power through LNG cold energy, and comprises a circulating working medium heater 5, a turbine 6 and a circulating working medium condenser 7 which are sequentially connected end to end, wherein a circulating working medium is arranged in a circulating loop formed by the three components, specifically, a working medium outlet of the circulating working medium heater 5 is connected with a working medium inlet of the turbine 6, a working medium outlet of the turbine 6 is connected with a working medium inlet of the circulating working medium condenser 7, and a working medium outlet of the circulating working medium condenser 7 is connected with a working medium inlet of the circulating working medium heater 5.
An exchange channel for exchanging heat with the channel of the circulating working medium is arranged in the circulating working medium condenser 7, in the application, a connecting device communicated with the exchange channel of the circulating working medium condenser 7 is additionally arranged at the inlet of the LNG heater, so that LNG liquefied natural gas entering the LNG heater firstly enters the circulating working medium condenser 7 and then enters the LNG heater, the LNG liquefied natural gas in a storage state under normal conditions can reach-162 ℃, enters the circulating working medium condenser 7 at-162 ℃ and exchanges heat with the circulating working medium, the temperature of the circulating working medium is reduced, the temperature of the LNG liquefied natural gas is increased, the heated LNG liquefied natural gas enters the LNG heater 4, which is equivalent to preheating the LNG liquefied natural gas, the consumption of more heating energy in the LNG heater 4 can be avoided, the LNG liquefied natural gas can reach the expected temperature of-35 ℃ through the heating of the circulating working medium condenser, can realize gasification quickly and ensure the stability of natural gas.
For the heating through power supply, in this application, the waste heat generated by the rankine cycle power generation system of the thermal power plant is introduced into the LNG heater, for example, the waste heat in the condenser 3 is used for heating the LNG heater by using the waste heat of the rankine cycle power generation system of the thermal power plant, so that the loss of a cold source of the rankine cycle power generation system of the thermal power plant can be fully utilized, and in the prior art, the loss of the cold source of the rankine cycle power generation system of the thermal power plant is usually directly distributed or introduced into seawater, so that the energy of the cold source is wasted.
In addition, the cold source loss is also used for heating the circulating working medium in the circulating working medium heater 5, the circulating working medium heater 5 can be heated specifically, and the circulating working medium in the LNG additional working medium cold energy power generation system is heated to realize power generation, so that the circulating working medium can be heated by utilizing the cold source loss of the Rankine cycle power generation system of the thermal power plant, on one hand, the cold source loss of the Rankine cycle power generation system of the thermal power plant is saved, the energy loss is avoided, and on the other hand, the power generation efficiency of the LNG additional working medium cold energy power generation system is facilitated.
The energy of make full use of rankine cycle power generation system cold source loss in this application to LNG additional working medium cold energy power generation system's the working medium heating and the heating of LNG liquefied natural gas in the LNG heater, can realize the abundant cyclic utilization of the energy, under the prerequisite of avoiding causing the influence to the environment, promote the generating efficiency among two circulation power generation systems.
On the basis of the above embodiment, the LNG heater 4 is provided with a first heat source working medium channel for performing heat exchange with the received natural gas, and the first heat source working medium channel is connected with the seawater or circulating water outlet of the condenser 3;
and/or the LNG heater 4 is provided with a second heat source working medium channel for carrying out heat exchange with the received natural gas, and the second heat source working medium channel is connected with the steam exhaust channel of the steam turbine 2.
It should be noted that, in order to realize the loss of the cold source continuously introduced into the rankine cycle power generation system of the thermal power plant in the LNG heater 4, a first heat source working medium channel is arranged in the LNG heater 4, and the channel is connected with the seawater or circulating water outlet of the condenser 3 and can also be connected with the exhaust channel of the steam turbine 2.
In addition, the second heat source working medium channel is also used for carrying out heat exchange with the received natural gas, and the second heat source working medium channel is connected with the exhaust channel of the steam turbine 2 and used for transmitting the heat of the steam turbine exhaust to the LNG heater 4 and utilizing the heat to raise the temperature of the LNG liquefied natural gas.
It can be known that, in the rankine cycle power generation system of the thermal power plant, the path from the steam turbine 2 to the condenser 3 is a heat dissipation process, and therefore, no matter the exhaust position of the steam turbine 2, the path for connecting the steam turbine 2 and the condenser 3, or the condensed water channel of the condenser 3, the heat is relatively high, and in order to avoid the heat being dissipated through cooling, the heat is conducted to the LNG heater 4, and the LNG liquefied natural gas in the LNG heater 4 can be heated by the heat.
It should be noted that in this embodiment, the first heat source is seawater or circulating water discharged from the condenser, and the second heat source is exhaust steam of the steam turbine.
This embodiment is through the first heat source working medium passageway with condenser 3 and LNG heater 4 to be connected, or is connected steam turbine 2 and LNG heater 4's second heat source working medium passageway for can be used for heating the LNG liquefied natural gas in the LNG heater 4 with the heat energy of condenser 3 or steam turbine 2's cold source loss, realized the make full use of to the energy, remove from and use extra energy to heat, and increased LNG heater 4 heating efficiency to liquefied natural gas.
On the basis of the above embodiment, the LNG heater 4 is provided with a first heat source working medium channel for heating natural gas with seawater or circulating water, an outlet of the seawater or circulating water channel of the LNG heater 4 is connected to an inlet of a cooling channel of the condenser 3, and the cooling channel is used for cooling the exhaust steam of the steam turbine received by the condenser 3 by using the seawater or circulating water cooled by the natural gas in the LNG heater.
It should be noted that, in the prior art, the circulation medium channels provided with the LNG are all performed by using an additionally provided heating medium, which wastes energy to a certain extent, in this embodiment, the LNG heater 4 is provided with a seawater or circulation water channel, seawater may be introduced into the channel, or circulation water may be introduced as a medium, both of which may be from the cooling channel of the condenser 3, that is, the condenser 3 is provided with a cooling channel for cooling the steam delivered from the turbine 2, and the cooling channel is provided with seawater or circulation water.
In this embodiment, an outlet of the seawater or circulating water passage for heating the LNG heater 4 is connected to the cooling passage, so that low-temperature seawater or circulating water after heat exchange with LNG liquefied natural gas enters the condenser 3 to cool the hot gas introduced into the condenser 3 by the turbine 2. The process utilizes the cold energy of the LNG heater 4 to cool the hot gas in the condenser 3.
On the basis of any one of the above embodiments, the circulating working medium heater 5 is provided with a first heat source circulating working medium channel and/or a second heat source circulating working medium channel for performing heat exchange with the circulating working medium;
the first heat source circulating working medium channel is connected with a seawater or circulating water outlet of the condenser 3, and the second heat source circulating working medium channel is connected with a steam exhaust channel of the steam turbine 2.
On the basis of any of the above embodiments, the outlet of the second heat source working medium circulation channel of the circulating working medium heater 5 is connected to the hot well inlet of the condenser 3, so as to provide low-temperature cooling water to the condenser 3. The steam turbine exhaust absorbs the working medium condensed after the cold energy of the circulating working medium in the circulating working medium heater, the condensed water after condensation is connected with the inlet of the hot well through the second heat source circulating working medium channel, and the condensed working medium can be recovered through the hot well.
It should be noted that a first heat source cycle working medium channel is arranged in the cycle working medium heater 5 and used for introducing seawater or circulating water, and the first heat source cycle working medium channel and the cycle working medium can exchange heat.
The inlet of the first heat source circulating working medium channel is connected with the seawater or circulating water outlet of the condenser 3, the inlet of the second heat source circulating working medium channel is connected with the steam exhaust channel of the steam turbine 2, and the second heat source working medium channel can be used for heat exchange with a circulating working medium after acquiring hot water or hot steam in the condenser 3 or the steam turbine 2, so that the temperature of the circulating working medium can be increased without adding an external heat source.
The outlet of the second heat source working medium circulating channel can be connected with a steam inlet or a water medium of the condenser 3, the medium in the second heat source working medium circulating channel is cooled by heat exchange with the circulating working medium, and the cooled medium in the second heat source working medium circulating channel can be supplemented into the condenser.
Optionally, the outlet of the second heat source working medium channel may be connected to the water medium inlet of the condenser 3, and may also be connected to the gas inlet of the condenser 3, both of which can achieve the purpose of transferring the low-temperature medium to the condenser 3.
Optionally, an LNG liquefied natural gas inlet of the circulating working medium condenser 7 is connected to the LNG storage tank 8, so that the LNG liquefied natural gas is absorbed and gasified in the circulating working medium condenser. Optionally, the LNG liquefied natural gas inlet may be connected to a facility for producing liquefied natural gas.
Optionally, a circulating working medium outlet of the circulating working medium condenser 7 is provided with a booster pump for pumping the circulating working medium to the circulating working medium heater 5.
On the basis of any of the above embodiments, the LNG heater 4 is connected to an expander, which is connected to a generator.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It is right above the utility model provides a thermal power plant coupling LNG cold energy power generation system has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (8)
1. The coupled LNG cold energy power generation system of the thermal power plant comprises a Rankine cycle power generation system of the thermal power plant, wherein the Rankine cycle power generation system of the thermal power plant comprises a boiler of the thermal power plant, a steam turbine and a condenser, the boiler is sequentially connected end to circulate steam-water, the condenser discharges heat lost by a cold source to cool steam exhausted by the steam turbine so as to condense the steam, and the steam turbine is used for driving a generator to generate electricity; the circulating working medium condenser is connected with the LNG heater and is used for gasifying and heating the LNG liquefied natural gas flowing to the LNG heater;
the Rankine cycle power generation system of the thermal power plant is respectively connected with the cycle working medium heater and the LNG heater so as to heat the cycle working medium in the cycle working medium heater and the natural gas in the LNG heater by utilizing the cold source loss of the Rankine cycle power generation system of the thermal power plant.
2. The thermal power plant coupled LNG cold energy power generation system of claim 1,
the LNG heater is provided with a first heat source working medium channel for carrying out heat exchange with received natural gas, and the first heat source working medium channel is connected with a seawater or circulating water outlet of the condenser;
and/or the LNG heater is provided with a second heat source working medium channel for carrying out heat exchange with the received natural gas, and the second heat source working medium channel is connected with the steam exhaust channel of the steam turbine.
3. The thermal power plant-coupled LNG cold energy power generation system of claim 1, wherein the LNG heater is provided with a first heat source working medium channel for heating natural gas with seawater or circulating water, a seawater or circulating water outlet of the first heat source working medium channel is connected with an inlet of a cooling channel of the condenser, and the cooling channel is used for cooling exhaust steam of the turbine received by the condenser by using seawater or circulating water cooled by natural gas in the LNG heater.
4. The coupled LNG cold energy power generation system of any one of claims 1 to 3, wherein the cycle fluid heater is provided with a first heat source cycle fluid channel and a second heat source cycle fluid channel for exchanging heat with a cycle fluid;
the first heat source circulating working medium channel is connected with a seawater or circulating water outlet of the condenser, and the second heat source circulating working medium channel is connected with a steam exhaust channel of the steam turbine.
5. The thermal power plant coupled LNG cold energy power generation system of claim 4, wherein the second heat source cycle working medium channel is connected with a hot well inlet of the condenser so as to recover condensed water discharged by a steam turbine.
6. The thermal power plant coupled LNG cold energy power generation system of claim 1, wherein an LNG liquefied natural gas inlet of the circulating working medium condenser is connected to an LNG storage tank, so that the LNG liquefied natural gas is vaporized by heat absorption in the circulating working medium condenser.
7. The coupled LNG cold energy power generation system of claim 6, wherein a cycle fluid outlet of the cycle fluid condenser is provided with a booster pump for pumping cycle fluid to the cycle fluid heater.
8. The thermal power plant coupled LNG cold energy power generation system of claim 6, wherein the LNG heater is connected to an expander, and the expander is connected to a generator.
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| CN110185509A (en) * | 2019-06-11 | 2019-08-30 | 赫普科技发展（北京）有限公司 | A kind of thermal power plant's coupling LNG cold energy generation system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110185509A (en) * | 2019-06-11 | 2019-08-30 | 赫普科技发展（北京）有限公司 | A kind of thermal power plant's coupling LNG cold energy generation system and method |
| CN110185509B (en) * | 2019-06-11 | 2024-04-16 | 赫普科技发展（北京）有限公司 | Thermal power plant coupling LNG cold energy power generation system and method |
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