CN211174245U - L NG cold energy power generation and comprehensive utilization system of mixed working medium - Google Patents
L NG cold energy power generation and comprehensive utilization system of mixed working medium Download PDFInfo
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- CN211174245U CN211174245U CN201922344634.XU CN201922344634U CN211174245U CN 211174245 U CN211174245 U CN 211174245U CN 201922344634 U CN201922344634 U CN 201922344634U CN 211174245 U CN211174245 U CN 211174245U
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Abstract
The utility model provides a mixed working medium's L NG cold energy electricity generation and comprehensive utilization system, the system includes L NG gasification unit, cold energy conveying unit and cyclic power generation unit, along L NG flow direction, L NG gasification unit is including the first heat transfer device and the second heat transfer device that connect gradually, cold energy conveying unit includes fourth heat transfer device and fifth heat transfer device, fifth heat transfer device connects the second heat transfer device, cyclic power generation unit includes electric energy conversion device and gas-liquid separation device, along mixed working medium flow direction, electric energy conversion device is cycle connection second heat transfer device, gas-liquid separation device and fourth heat transfer device in proper order, gas-liquid separation device still connects first heat transfer device, this system can effectively retrieve L NG cold energy, adopt mixed working medium to carry out multistage heat transfer in heat transfer device, reduce the heat transfer temperature difference of cold energy recovery in-process, realize high-efficient electric energy conversion, economic benefits and social have apparent economic benefits.
Description
Technical Field
The utility model belongs to the technical field of L NG cold energy utilizes, a L NG cold energy electricity generation and comprehensive utilization system are related to, especially relate to a mixed working medium's L NG cold energy electricity generation and comprehensive utilization system.
Background
Natural gas is a mixture of different components in a certain proportion, the main component of the natural gas is hydrocarbon, including methane, ethane, propane, butane and the like, wherein the methane accounts for more than 90%, L NG is liquefied natural gas (L quefied natural gas), natural gas which is liquid under normal pressure is obtained after the natural gas produced by a gas field is purified and is liquefied through a series of ultralow temperature, and the liquefied natural gas is generally the cleanest fossil energy on the earth.
For the convenience of natural gas transportation, natural gas is generally liquefied, the storage temperature of L NG is-162 ℃, the temperature used by users is about 5 ℃, the cold energy released in the gasification process from the storage temperature to the use temperature is about 830kJ/kg, and if the cold energy possessed by L NG is converted into electric energy with 100% efficiency, the cold energy of L NG per ton can be converted into electric energy of 240 kWh.
Therefore, the available L NG cold energy is considerable, the cold energy has higher utilization value from the aspect of energy quality, and if L NG cold energy is utilized through a specific process, the aims of saving energy and improving economic benefit can be achieved.
L NG cold energy can be used directly or indirectly, L NG direct utilization method comprises cold energy power generation, sea water desalination, liquefaction and separation of air (liquid oxygen and liquid nitrogen), light hydrocarbon separation, freezing warehouse, liquefied carbonic acid, dry ice preparation, air conditioning, indirect utilization of frozen food, low-temperature crushing waste treatment, freezing preservation, low-temperature medical treatment, food preservation and the like.
CN204238992U discloses a system for generating power by utilizing liquefied natural gas cooling energy, which comprises a first L NG pump, a second L NG pump, a third L NG pump, a low-pressure natural gas condenser, a medium-pressure natural gas condenser, a low-pressure refrigerant condenser, a first liquid refrigerant pump, a second liquid refrigerant pump, a third liquid refrigerant pump, a refrigerant gasifier, a high-pressure natural gas heater, a high-pressure natural gas superheater, a refrigerant expander, a natural gas expander, a secondary medium-pressure refrigerant condenser and a medium-pressure refrigerant condenser, wherein the whole power generation process comprises a natural gas medium Rankine cycle part and a mixed refrigerant Rankine cycle part, so that the effective energy loss in the recovery process of the L NG cold energy is reduced, and the power generation efficiency of L NG cold energy is improved.
The process for generating power by utilizing L NG cold energy releases a large amount of cold energy in the process of supplying natural gas to a downstream pipe network by virtue of L NG vaporization, the process utilizes two independent cycles to recover the cold energy for power generation, avoids the loss of the cold energy, improves the economic benefit of enterprises, avoids the pollution problem caused by power generation of a power plant while generating power, and meets the requirements of energy conservation and environmental protection.
CN208168940U discloses a system for generating power by utilizing liquefied natural gas cold energy of a large-scale L NG receiving station, three groups of independent heat exchange channels are arranged in a main heat exchanger, an inlet and an outlet of a first heat exchange channel are respectively connected with a liquefied natural gas pipe and a natural gas pipe, an outlet of a second heat exchange channel is connected with a mixed working medium buffer tank, an outlet of the mixed working medium buffer tank is connected with a mixed working medium booster pump, an outlet of the mixed working medium booster pump is connected with an inlet of a third heat exchange channel, an outlet of the third heat exchange channel is connected with a mixed working medium heater, an outlet of the mixed working medium heater is connected with an inlet of an expander, an outlet of the expander is connected with an inlet of the second heat exchange channel, the expander is connected with a generator, low-temperature Rankine cycle of the mixed working medium is adopted to convert L NG cold energy into electric energy, the system has good adjustability and variable working condition adaptability, the comprehensive utilization efficiency of energy of the large-scale liquefied natural gas receiving station can be improved, the mixed working medium is directly liquefied with L NG by adopting a heat exchanger, the heat exchange is larger, the heat exchange efficiency is not carried out according to the temperature gradient, the overall heat transfer efficiency is low, the energy.
Although some patents and technologies can realize L NG cold energy power generation, most of the systems have the problems of complex power generation system, low cold energy utilization rate, high temperature of required waste heat source, low unit cold energy power generation amount and the like.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a mixed working medium's L NG cold energy electricity generation and comprehensive utilization system, the utility model discloses a comprehensive utilization of L NG receiving station cold energy provides probably, can realize L NG's cold energy electricity generation under the prerequisite of guaranteeing L NG receiving station liquefied natural gas gasification, improves energy utilization, adopts the secondary refrigerant to transport the cold energy simultaneously, can satisfy the operation requirement that needs cold user.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the utility model provides a mixed working medium's L NG cold energy electricity generation and comprehensive utilization system, the system includes L NG gasification unit, cold energy conveying unit and circulation power generation unit.
Along the direction of L NG, the L NG gasification unit comprises a first heat exchange device and a second heat exchange device which are connected in sequence.
The cold energy conveying unit comprises a fourth heat exchange device and a fifth heat exchange device, the fifth heat exchange device is connected with the second heat exchange device, and L NG sequentially enters the fifth heat exchange device to exchange heat with secondary refrigerant after passing through the first heat exchange device and the second heat exchange device for heat.
The circulating power generation unit comprises an electric energy conversion device and a gas-liquid separation device.
The electric energy conversion device is sequentially connected with the second heat exchange device, the gas-liquid separation device and the fourth heat exchange device in a circulating mode along the flow direction of the mixed working medium, the gas-liquid separation device is further connected with the first heat exchange device, the mixed working medium is used for doing work through the electric energy conversion device to generate power and then enters the second heat exchange device to exchange heat with L NG, the mixed working medium after heat exchange enters the gas-liquid separation device, a gas-phase working medium obtained through gas-liquid separation enters the first heat exchange device to exchange heat with L NG, and a liquid-phase working medium obtained through gas-liquid separation enters the electric energy conversion device through the fourth heat exchange device to.
The utility model provides a can adopt ultra-low temperature heat source mixing medium's L NG cold energy power generation system this system can effectively retrieve L NG cold energy, adopts mixing medium to carry out multistage heat transfer in heat transfer device, reduces the heat transfer difference in temperature of cold energy recovery in-process, realizes high-efficient thermoelectric conversion, has apparent economic benefits and social.
As an optimized technical scheme of the utility model, the mixed working medium include two kinds at least organic working mediums.
The boiling points of the organic working media are different.
As a preferable technical proposal of the utility model, the mixed working medium comprises the combination of at least two of methane, ethane or propane.
As a preferable technical proposal of the utility model, the mixed working medium is a mixture of methane, ethane and propane.
The volume ratio of methane, ethane and propane in the mixed working fluid is (0.3-0.5): (0.1-0.2), and may be, for example, 0.3:0.3:0.1, 0.4:0.3:0.1, 0.5:0.3:0.1, 0.3:0.4:0.1, 0.3:0.5:0.1 or 0.3:0.3:0.2, but is not limited to the values listed, and other values not listed within the range of values are also applicable.
As a preferable technical proposal of the utility model, the secondary refrigerant comprises glycol and/or calcium chloride solution.
As an optimized technical scheme of the utility model, the comprehensive utilization system still include third heat transfer device.
The outlet of the electric energy conversion device is divided into two paths, one path is connected with a hot side inlet of the second heat exchange device, the other path is connected with a hot side inlet of the third heat exchange device, the hot side outlet of the second heat exchange device and the hot side outlet of the third heat exchange device are combined into one path and then connected with a liquid inlet of the gas-liquid separation device, a gas phase outlet of the gas-liquid separation device is connected with the hot side inlet of the first heat exchange device, the hot side outlet of the first heat exchange device is connected with a cold side inlet of the third heat exchange device, and a cold side outlet of the third heat exchange device and a liquid phase outlet of the gas-liquid separation device are combined into one path and then connected with a cold side;
the mixed working medium is divided into two parts after being worked by the electric energy conversion device to generate electricity, one part of the mixed working medium enters the second heat exchange device to exchange heat with L NG flowing out of the first heat exchange device, the other part of the mixed working medium enters the third heat exchange device to exchange heat with a gas-phase working medium flowing out of the first heat exchange device, and the mixed working medium which is subjected to heat exchange and temperature reduction in the second heat exchange device and the third heat exchange device respectively converges and then enters the gas-liquid separation device.
As a preferred technical scheme of the utility model, comprehensive utilization system still include at least one supercharging device.
As an optimized technical scheme of the utility model, comprehensive utilization system include first supercharging device and second supercharging device.
The first supercharging device is arranged on a connecting pipeline of the first heat exchange device and the third heat exchange device.
The second supercharging device is arranged on a connecting pipeline between the gas-liquid separation device and the fourth heat exchange device, and an outlet of the second supercharging device and a cold side outlet of the third heat exchange device are combined into one path and then connected with a cold side inlet of the fourth heat exchange device.
As an optimized technical proposal of the utility model, the supercharging device is a booster pump.
As a preferred technical scheme of the utility model, electric energy conversion device be the turbine.
Illustratively, adopt the utility model provides an L NG cold energy electricity generation and comprehensive utilization system utilize L NG's cold energy to generate electricity, comprehensive utilization method include the following step:
l NG sequentially passes through the first heat exchange device and the second heat exchange device to exchange heat, and then enters the fifth heat exchange device to exchange heat with the secondary refrigerant conveyed by a user needing cooling;
(II) the mixed working medium is divided into a first mixed working medium and a second mixed working medium after the electric energy conversion device does work to generate electricity, the first mixed working medium enters the second heat exchange device to exchange heat with L NG entering the second heat exchange device in the step (I), the second mixed working medium enters the third heat exchange device to exchange heat with liquefied gas-phase working medium flowing out of the first heat exchange device in the step (III), the first mixed working medium and the second mixed working medium are converged and enter a gas-liquid separation device after heat exchange and temperature reduction respectively, and gas-phase working medium and liquid-phase working medium are obtained through separation;
(III) introducing the gas-phase working medium obtained by separation of the gas-liquid separation device into a first heat exchange device to exchange heat with L NG entering the first heat exchange device in the step (I), pressurizing the gas-phase working medium subjected to heat exchange by a first pressurizing device and then entering a third heat exchange device, and exchanging heat between the gas-phase working medium and a second mixed working medium flowing out of the electric energy conversion device in the third heat exchange device;
(IV) mixing the liquid phase working medium obtained by the separation of the gas-liquid separation device with the gas phase working medium flowing out of the third heat exchange device to form a mixed working medium, allowing the mixed working medium to enter the fourth heat exchange device to exchange heat with the secondary refrigerant conveyed by a user needing cooling, and allowing the mixed working medium after heat exchange to enter the electric energy conversion device to repeat the step (II) to realize cyclic working power generation.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model provides a possibility for the comprehensive utilization of the cold energy of the L NG receiving station, can realize the cold energy power generation of L NG on the premise of ensuring the gasification of the liquid natural gas of the L NG receiving station, improve the energy utilization rate, and simultaneously adopt the secondary refrigerant to transport the cold energy, thereby meeting the use requirements of users needing cold;
(2) the utility model discloses make full use of the cold energy under the different temperature gradients, energy utilization efficiency is high. Simultaneously the utility model discloses choose for use the mixed working medium, according to the mixed working medium of methane, ethane, the propane of different proportion configurations, no matter on cold energy generated energy still system's heat transfer gradient, all have great advantage.
(3) The utility model discloses combine together L NG cold energy power generation technique and cold energy comprehensive utilization technique for the first time, will utilize when realizing cold energy power generation shallow cold resource after carrying to need cold user and carry out comprehensive utilization, greatly improved the utilization efficiency of cold energy, reduced the waste of cold volume.
Drawings
Fig. 1 is a schematic structural diagram of an L NG cold energy power generation and comprehensive utilization system provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an L NG cold energy power generation and comprehensive utilization system provided in embodiment 3 of the present invention;
wherein, 1-a first heat exchange device; 2-a second heat exchange device; 3-a third heat exchange device; 4-a fourth heat exchange device; 5-fifth heat exchange device; 6-gas-liquid separation device; 7-a second supercharging device; 8-a first supercharging device; 9-electric energy conversion device.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example 1
The embodiment provides an L NG cold energy power generation and comprehensive utilization system of mixed working media, and the system comprises a L NG gasification unit, a cold energy transmission unit and a circulating power generation unit as shown in figure 1.
Flowing towards L NG, L NG gasification unit comprises a first heat exchange device 1 and a second heat exchange device 2 connected in series.
The cold energy conveying unit comprises a fourth heat exchange device 4 and a fifth heat exchange device 5, the fifth heat exchange device 5 is connected with the second heat exchange device 2, and L NG sequentially enters the fifth heat exchange device 5 to exchange heat with the secondary refrigerant after heat exchange of the first heat exchange device 1 and the second heat exchange device 2.
The circulating power generation unit comprises an electric energy conversion device 9 and a gas-liquid separation device 6, the electric energy conversion device 9 is sequentially connected with a second heat exchange device 2, the gas-liquid separation device 6 and a fourth heat exchange device 4 in a circulating mode along the flow direction of a mixed working medium, the gas-liquid separation device 6 is further connected with a first heat exchange device 1, the mixed working medium performs power generation through the electric energy conversion device 9 and then enters the second heat exchange device 2 to exchange heat with L NG, the mixed working medium after heat exchange enters the gas-liquid separation device 6, a gas-phase working medium obtained through gas-liquid separation enters the first heat exchange device 1 to exchange heat with L NG, and a liquid-phase working medium obtained through gas-liquid separation sequentially passes through the fourth heat exchange device 4, the electric energy conversion device 9 and the second heat exchange device.
The comprehensive utilization system provided in this embodiment further includes a second pressure boosting device 7, where the second pressure boosting device 7 is disposed on a connection pipeline between the gas-liquid separation device 6 and the fourth heat exchange device 4, in this embodiment, the pressure boosting device is a pressure boosting pump, and the electric energy conversion device 9 is a turbine.
Example 2
The comprehensive utilization system provided by the embodiment 1 is adopted to comprehensively utilize the cold energy of L NG, and the comprehensive utilization method comprises the following steps:
(1) 10MPa of L NG at-150 ℃ conveyed from an L NG receiving station is conveyed into a first heat exchange device 1, the heat exchange is carried out between the L NG and a gas phase working medium discharged from a gas phase outlet of a gas-liquid separation device 6 in the first heat exchange device 1, and the temperature of L NG after heat exchange is increased to-100 ℃;
the L NG after temperature rise enters the second heat exchange device 2, and exchanges heat with the mixed working medium discharged from the outlet of the electric energy conversion device 9 in the second heat exchange device 2, the L NG after heat exchange rises to-45 ℃, and is gasified into low-temperature natural gas;
the gasified natural gas enters a fifth heat exchange device 5 to exchange heat with the secondary refrigerant glycol of 10 ℃ conveyed by a user needing cooling, the temperature of the natural gas after heat exchange is raised to 5 ℃ to meet the conveying condition of a pipe network, the secondary refrigerant glycol is cooled to minus 36 ℃ for downstream cooling equipment to use, the finished natural gas after heat exchange by the fifth heat exchange device 5 is output to a power generation system and enters a gas transmission main pipe, and finally enters a natural gas pipe network to finish the gasification process of L NG.
(2) The mixed working medium with the temperature of 5 ℃ and the pressure of 4.2MPa works and generates electricity in the electric energy conversion device 9, and the mixed working medium is methane, ethane and propane, and the weight ratio of the mixed working medium to the mixed working medium is 0.4: 0.4: mixing according to the volume ratio of 0.15, reducing the temperature of the mixed working medium to-40 ℃ after acting to generate electricity, and reducing the pressure to 1.1 MPa;
the mixed working medium enters a second heat exchange device 2 to exchange heat with L NG entering the second heat exchange device 2 in the step (1), and the heat exchange temperature of the mixed working medium is reduced to-90 ℃;
(3) introducing the gas-phase working medium obtained by separation of the gas-liquid separation device 6 into the first heat exchange device 1 to exchange heat with L NG entering the first heat exchange device 1 in the step (1), and carrying out heat exchange on the gas-phase working medium in the first heat exchange device 1 to reduce the temperature to-120 ℃ and condensing the gas-phase working medium into liquid;
(4) the liquid phase working medium obtained by the separation of the gas-liquid separation device 6 is pressurized to 4.25MPa by the second pressurization device 7 and then enters the fourth heat exchange device 4 to exchange heat with the secondary refrigerant glycol with the temperature of 10 ℃ conveyed by a user needing cooling, the mixed working medium exchanges heat in the fourth heat exchange device 4 and is heated to 5 ℃, the pressure is changed to 4.25MPa, and the mixed working medium after heat exchange enters the electric energy conversion device 9 to repeat the step (2) to realize the power generation by circularly doing work; the secondary refrigerant glycol exchanges heat in the fourth heat exchange device 4 and is cooled to-36 ℃.
Example 3
The embodiment provides an L NG cold energy power generation and comprehensive utilization system of mixed working media, and the system comprises a L NG gasification unit, a cold energy transmission unit and a circulating power generation unit as shown in figure 2.
Flowing towards L NG, L NG gasification unit comprises a first heat exchange device 1 and a second heat exchange device 2 connected in series.
The cold energy conveying unit comprises a fourth heat exchange device 4 and a fifth heat exchange device 5, the fifth heat exchange device 5 is connected with the second heat exchange device 2, and L NG sequentially enters the fifth heat exchange device 5 to exchange heat with the secondary refrigerant after heat exchange of the first heat exchange device 1 and the second heat exchange device 2.
The circulating power generation unit comprises an electric energy conversion device 9 and a gas-liquid separation device 6, the electric energy conversion device 9 is sequentially connected with a second heat exchange device 2, the gas-liquid separation device 6 and a fourth heat exchange device 4 in a circulating mode along the flow direction of a mixed working medium, the gas-liquid separation device 6 is further connected with a first heat exchange device 1, the mixed working medium performs power generation through the electric energy conversion device 9 and then enters the second heat exchange device 2 to exchange heat with L NG, the mixed working medium after heat exchange enters the gas-liquid separation device 6, a gas-phase working medium obtained through gas-liquid separation enters the first heat exchange device 1 to exchange heat with L NG, and a liquid-phase working medium obtained through gas-liquid separation sequentially passes through the fourth heat exchange device 4, the electric energy conversion device 9 and the second heat exchange device.
The comprehensive utilization system further comprises a third heat exchange device 3, an outlet of an electric energy conversion device 9 is divided into two paths, one path is connected with a hot side inlet of the second heat exchange device 2, the other path is connected with a hot side inlet of the third heat exchange device 3, a hot side outlet of the second heat exchange device 2 and a hot side outlet of the third heat exchange device 3 are combined into one path and then connected with a liquid inlet of the gas-liquid separation device 6, a gas phase outlet of the gas-liquid separation device 6 is connected with a hot side inlet of the first heat exchange device 1, a hot side outlet of the first heat exchange device 1 is connected with a cold side inlet of the third heat exchange device 3, a cold side outlet of the third heat exchange device 3 and a liquid phase outlet of the gas-liquid separation device 6 are combined into one path and then connected with a cold side inlet of the fourth heat exchange device 4, the mixed working medium is divided into two parts after power generation by the electric energy conversion device 9, one part of the mixed working medium enters the second heat exchange device 2 to exchange heat with L flowing out of the first heat exchange device 1, the other part of the mixed working medium enters the third heat exchange device 3 and then flows into the gas-liquid.
The comprehensive utilization system comprises a first supercharging device 8 and a second supercharging device 7, wherein the first supercharging device 8 is arranged on a connecting pipeline of the first heat exchange device 1 and the third heat exchange device 3. The second supercharging device 7 is arranged on a connecting pipeline between the gas-liquid separation device 6 and the fourth heat exchange device 4, and an outlet of the second supercharging device 7 and a cold side outlet of the third heat exchange device 3 are combined into one path and then connected with a cold side inlet of the fourth heat exchange device 4. In this embodiment, the boosting device is a booster pump, and the electric energy conversion device 9 is a turbine.
Example 4
The comprehensive utilization system provided by the embodiment 3 is adopted to comprehensively utilize the cold energy of L NG, and the comprehensive utilization method comprises the following steps:
(1) 10MPa of L NG at-150 ℃ conveyed from an L NG receiving station is conveyed into a first heat exchange device 1, the heat exchange is carried out between the L NG and a gas phase working medium discharged from a gas phase outlet of a gas-liquid separation device 6 in the first heat exchange device 1, and the temperature of L NG after heat exchange is increased to-100 ℃;
the L NG after temperature rise enters the second heat exchange device 2, and exchanges heat with the mixed working medium discharged from the outlet of the electric energy conversion device 9 in the second heat exchange device 2, the L NG after heat exchange rises to-45 ℃, and is gasified into low-temperature natural gas;
the gasified natural gas enters a fifth heat exchange device 5 to exchange heat with the secondary refrigerant glycol of 10 ℃ conveyed by a user needing cooling, the temperature of the natural gas after heat exchange is raised to 5 ℃ to meet the conveying condition of a pipe network, the secondary refrigerant glycol is cooled to minus 36 ℃ for downstream cooling equipment to use, the finished natural gas after heat exchange by the fifth heat exchange device 5 is output to a power generation system and enters a gas transmission main pipe, and finally enters a natural gas pipe network to finish the gasification process of L NG.
(2) The mixed working medium with the temperature of 5 ℃ and the pressure of 4.2MPa works and generates electricity in the electric energy conversion device 9, and the mixed working medium is methane, ethane and propane, and the weight ratio of the mixed working medium to the mixed working medium is 0.4: 0.4: mixing according to the volume ratio of 0.15, reducing the temperature of the mixed working medium to-40 ℃ after acting to generate electricity, and reducing the pressure to 1.1 MPa;
the mixed working medium after acting and generating is divided into a first mixed working medium and a second mixed working medium, the first mixed working medium accounts for 60% of the total volume flow of the mixed working medium, and the balance is the second mixed working medium;
wherein the first mixed working medium enters the second heat exchange device 2 to exchange heat with L NG entering the second heat exchange device 2 in the step (1), and the heat exchange temperature of the first mixed working medium is reduced to-90 ℃;
the second mixed working medium enters a third heat exchange device 3 to exchange heat with the gas-phase working medium flowing out of the first heat exchange device 1 in the step (3), and the second mixed working medium is cooled to-90 ℃ through heat exchange;
the first mixed working medium and the second mixed working medium respectively exchange heat and reduce the temperature, then converge and enter a gas-liquid separation device 6, and are separated to obtain a gas-phase working medium and a liquid-phase working medium;
(3) introducing the gas-phase working medium obtained by separation of the gas-liquid separation device 6 into the first heat exchange device 1 to exchange heat with L NG entering the first heat exchange device 1 in the step (1), and carrying out heat exchange on the gas-phase working medium in the first heat exchange device 1 to reduce the temperature to-120 ℃ and condensing the gas-phase working medium into liquid;
the gas-phase working medium after heat exchange is pressurized to 4.3MPa by the first pressurizing device 8 and then enters the third heat exchange device 3, and the gas-phase working medium exchanges heat with a second mixed working medium flowing out of the electric energy conversion device 9 in the third heat exchange device 3 and is heated to-45 ℃;
(4) the liquid phase working medium obtained by the separation of the gas-liquid separation device 6 is pressurized to 4.25MPa by the second pressurization device 7 and then is mixed with the gas phase working medium flowing out of the third heat exchange device 3 to form a mixed working medium at the temperature of-50 ℃, the mixed working medium enters the fourth heat exchange device 4 to exchange heat with the coolant glycol with the temperature of 10 ℃ conveyed by a user needing cooling, the mixed working medium exchanges heat in the fourth heat exchange device 4 and is heated to 5 ℃, the pressure is changed to 4.25MPa, and the mixed working medium after heat exchange enters the electric energy conversion device 9 to repeat the step (2) to realize the power generation by circularly doing work; the secondary refrigerant glycol exchanges heat in the fourth heat exchange device 4 and is cooled to-36 ℃.
Example 5
The difference between the embodiment and the embodiment 4 is that the secondary refrigerant is replaced by seawater, the seawater is adopted to exchange heat with the mixed working medium in the fourth heat exchange device 4, so that the mixed working medium after heat exchange meets the power generation requirement, and the seawater is adopted to exchange heat with L NG in the fifth heat exchange device 5, so that L NG after heat exchange meets the gasification requirement.
The other operation steps and process conditions were exactly the same as in example 4.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. An L NG cold energy power generation and comprehensive utilization system of mixed working media is characterized by comprising a L NG gasification unit, a cold energy transmission unit and a circulating power generation unit;
along the direction of L NG, the L NG gasification unit comprises a first heat exchange device and a second heat exchange device which are connected in sequence;
the cold energy conveying unit comprises a fourth heat exchange device and a fifth heat exchange device, the fifth heat exchange device is connected with the second heat exchange device, and L NG enters the fifth heat exchange device to exchange heat with the secondary refrigerant after sequentially exchanging heat with the first heat exchange device and the second heat exchange device;
the circulating power generation unit comprises an electric energy conversion device and a gas-liquid separation device;
the electric energy conversion device is sequentially connected with the second heat exchange device, the gas-liquid separation device and the fourth heat exchange device in a circulating mode along the flow direction of the mixed working medium, the gas-liquid separation device is further connected with the first heat exchange device, the mixed working medium is used for doing work through the electric energy conversion device to generate power and then enters the second heat exchange device to exchange heat with L NG, the mixed working medium after heat exchange enters the gas-liquid separation device, a gas-phase working medium obtained through gas-liquid separation enters the first heat exchange device to exchange heat with L NG, and a liquid-phase working medium obtained through gas-liquid separation enters the electric energy conversion device through the fourth heat exchange device to.
2. The comprehensive utilization system of claim 1, wherein the mixed working fluid comprises at least two organic working fluids;
the boiling points of the organic working media are different.
3. The integrated utilization system according to claim 2, wherein the mixed working fluid comprises a combination of at least two of methane, ethane, or propane.
4. The comprehensive utilization system of claim 3, wherein the mixed working medium is a mixture of methane, ethane and propane;
the volume ratio of methane, ethane and propane in the mixed working medium is (0.3-0.5): (0.3-0.5): (0.1-0.2).
5. The integrated utilization system according to claim 1, wherein said coolant comprises a solution of ethylene glycol and/or calcium chloride.
6. The integrated utilization system according to claim 1, further comprising a third heat exchange means;
the outlet of the electric energy conversion device is divided into two paths, one path is connected with a hot side inlet of the second heat exchange device, the other path is connected with a hot side inlet of the third heat exchange device, the hot side outlet of the second heat exchange device and the hot side outlet of the third heat exchange device are combined into one path and then connected with a liquid inlet of the gas-liquid separation device, a gas phase outlet of the gas-liquid separation device is connected with the hot side inlet of the first heat exchange device, the hot side outlet of the first heat exchange device is connected with a cold side inlet of the third heat exchange device, and a cold side outlet of the third heat exchange device and a liquid phase outlet of the gas-liquid separation device are combined into one path and then connected with a cold side;
the mixed working medium is divided into two parts after being worked by the electric energy conversion device to generate electricity, one part of the mixed working medium enters the second heat exchange device to exchange heat with L NG flowing out of the first heat exchange device, the other part of the mixed working medium enters the third heat exchange device to exchange heat with a gas-phase working medium flowing out of the first heat exchange device, and the mixed working medium which is subjected to heat exchange and temperature reduction in the second heat exchange device and the third heat exchange device respectively converges and then enters the gas-liquid separation device.
7. The integrated utilization system of claim 1, further comprising at least one pressure boosting device.
8. The integrated utilization system according to claim 7, comprising a first pressure boosting device and a second pressure boosting device;
the first supercharging device is arranged on a connecting pipeline between the first heat exchange device and the third heat exchange device;
the second supercharging device is arranged on a connecting pipeline between the gas-liquid separation device and the fourth heat exchange device, and an outlet of the second supercharging device and a cold side outlet of the third heat exchange device are combined into one path and then connected with a cold side inlet of the fourth heat exchange device.
9. The integrated utilization system of claim 7, wherein said pressurizing means is a pressurizing pump.
10. The integrated utilization system of claim 1, wherein said electric energy conversion device is a turbine.
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| CN110847987B (en) * | 2019-12-24 | 2024-04-05 | 青岛中稷龙源能源科技有限公司 | LNG cold energy power generation and comprehensive utilization system and method for mixed working medium |
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