Carbon dioxide low-temperature Rankine cycle power generation system

A carbon dioxide and Rankine cycle technology, applied in the direction of machines/engines, steam engines, mechanical equipment, etc., can solve the problems of low exhaust gas temperature, low efficiency, and difficulty in effectively reducing carbon dioxide emissions, so as to improve the utilization rate and energy. Utilization rate, effect of reducing heat source cost

Inactive Publication Date: 2018-08-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All kinds of industrial exhaust gas contain a lot of carbon dioxide, the temperature of the exhaust gas is generally not high, the efficiency of conventional utilization is low, and it is difficult to effectively reduce carbon dioxide emissions

Method used

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  • Carbon dioxide low-temperature Rankine cycle power generation system
  • Carbon dioxide low-temperature Rankine cycle power generation system
  • Carbon dioxide low-temperature Rankine cycle power generation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a carbon dioxide low-temperature Rankine cycle power generation system includes a turbine 1 , a condenser 2 , a working medium pump 3 , an air heater 4 , an LNG liquid storage tank 5 and a generator 6 .

[0033] Among them, the cold side outlet of the air heater 4 is connected to the gas inlet of the turbine 1, the turbine 1 is connected to the generator 6, the gas outlet of the turbine 1 is connected to the hot side inlet of the condenser 2, and the hot side outlet of the condenser 2 It is connected to the inlet of the working medium pump 3, and the outlet of the working medium pump 3 is connected to the cold side inlet of the air heater 4.

[0034] Ambient air enters from the inlet of the hot side of the air heater 4 to exchange heat with the liquid carbon dioxide on the cold side, and then discharges to the atmosphere from the outlet of the hot side; the condenser 2 uses low-temperature LNG to cool the carbon dioxide, and the outlet of the ...

Embodiment 2

[0038] The carbon dioxide low-temperature Rankine cycle power generation system provided in this embodiment adds a preheater 7 on the basis of the power generation system in Embodiment 1, and the preheater 7 is connected in series with the air heater 4 .

[0039] Such as figure 2 As shown, the cold side inlet of the preheater 7 is connected to the outlet of the working medium pump 3, and the cold side outlet of the preheater is connected to the cold side inlet of the air heater 4;

[0040] The hot side inlet of the preheater 7 is connected with the hot side outlet of the air heater 4, and the hot side outlet of the preheater 7 leads to the atmosphere.

[0041]After the liquid carbon dioxide is boosted by the working medium pump 3, it is discharged from the outlet of the working medium pump 3 and enters the preheater from the cold side inlet of the preheater 7 through the pipeline, and then enters the air from the cold side outlet of the preheater 7 for heating In the cold en...

Embodiment 3

[0045] The carbon dioxide low-temperature Rankine cycle power generation system provided in this embodiment has the same structure as that of the power generation system in Embodiment 1, except that the working fluid pump 3 is connected to the turbine 1, and one or more transmissions are added. The specific connection method as follows:

[0046] Such as image 3 As shown, the shaft of the working medium pump 3 is connected with the transmission, and the transmission is connected with the output shaft of the turbine.

[0047] Carbon dioxide enters the turbine for thermal power conversion. Turbine 1 rotates and drives the transmission connected to it to rotate. The speed of turbine 1 is adjusted to the speed of working medium pump 3 through the transmission to drive working medium pump 3 to rotate. The kinetic energy generated by the turbine 1 drives the working medium pump to work, which saves the electric energy required by the working medium pump and improves the utilization...

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Abstract

The invention discloses a carbon dioxide low-temperature Rankine cycle power generation system. According to the power generation system, carbon dioxide is adopted as a cycle working medium, environment air is adopted as a heat source, the pressure of high-pressure liquid-state LNG is reduced in the use process, the temperature of the high-pressure liquid-state LNG is reduced to -162 DEG C, and therefore a cold source environment is formed; and the carbon dioxide discharged by a turbine is cooled to a liquid state in a condenser by the low-temperature LNG, after being pressurized by a workingmedium pump, the carbon dioxide absorbs heat from the environment to the heat state, and then the carbon dioxide enters the turbine to act to drive a motor to generate power. The system has the advantages that the temperature of a cold source is low, the environment is adopted as the heat source, and wasted work of the working medium pump is small; and the environment air is directly adopted as the heat source, and no extra energy is needed to be consumed for providing heat for the power generation system.

Description

technical field [0001] The invention relates to the field of energy power generation, in particular to a carbon dioxide low-temperature Rankine cycle power generation system. Background technique [0002] Natural gas is widely used because of its high efficiency and cleanliness, and occupies an increasingly important position in the energy structure. Natural gas is generally stored in a high-pressure liquid form. During use, as the pressure decreases, the temperature of high-pressure LNG drops a lot, reaching a low temperature of -162°C, thus forming a cold source environment. There is a huge temperature difference between LNG and the environment. If this part of cold energy is not recycled, it will lead to a large waste of energy. [0003] Ways to recycle LNG cold energy include: air separation, cold energy power generation, production of liquid CO2 or dry ice, refrigerated storage or ice making, light hydrocarbon separation and seawater desalination, etc.; however, the us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K11/02F01K25/10
CPCF01K11/02F01K25/103
Inventor 戴义平夏文凯霍耀武韩健明宋云飞王江峰
Owner XI AN JIAOTONG UNIV
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