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System for generating power and producing hydrogen by using cold energy of liquefied natural gas

A technology of liquid natural gas and power generation system, applied in the field of natural gas and renewable energy, can solve the problems of difficult long-distance transportation of hydrogen, high cost of hydrogen production from electrolyzed water, low utilization efficiency, etc., to overcome the low utilization rate of LNG cold energy and stabilize Time difference, the effect of alleviating the peak shaving problem

Active Publication Date: 2021-11-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems of low utilization efficiency of cold energy of liquid natural gas, high cost of hydrogen production by electrolysis of water and difficulty in long-distance transportation of hydrogen, the present invention proposes a system for generating hydrogen by using cold energy of liquid natural gas

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  • System for generating power and producing hydrogen by using cold energy of liquefied natural gas
  • System for generating power and producing hydrogen by using cold energy of liquefied natural gas

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specific Embodiment approach 1

[0033] Specific implementation mode one: see figure 1 This embodiment will be described. The system for producing hydrogen by using the cold energy of liquefied natural gas described in this embodiment includes a low-temperature Rankine cycle power generation system, an LNG gasification system, and an electrolysis water system, including a low-temperature Rankine cycle power generation system, an LNG gasification system, and an electrolysis water system , with the help of a low-temperature Rankine cycle power generation system to realize the conversion of cold energy of liquefied natural gas into electric energy, and use the generated electricity to complete the electrolysis process of water in the electrolysis water system to produce hydrogen and oxygen. The LNG gasification system uses low-temperature Rankine In the cycle power generation system, the high-temperature working medium after expansion and work is fully heat-exchanged, absorbing heat and gasifying.

[0034] The ...

specific Embodiment approach 2

[0054] Specific implementation mode two: see figure 2 This embodiment will be described. The gas pressure regulator 5 is directly connected to the user side 19, the hydrogen storage tank 15 is directly connected to another user side 20, and no hydrogen-natural gas blending system is installed. Other structures are the same as in the first embodiment. The present invention has two operation modes. In the first embodiment, the hydrogen storage tank 15 is not provided, and in the second embodiment, the hydrogen storage tank 15 is provided.

[0055] Another operation mode of this device is that if there is a stable hydrogen load near the hydrogen production end, the hydrogen produced can be used nearby, without the need to use the hydrogen-natural gas blending system for gas blending and long-distance transportation. In this mode of operation, the hydrogen produced in the proton exchange membrane electrolyzer 13 does not need to be mixed with natural gas for long-distance trans...

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Abstract

The invention provides a system for generating power and producing hydrogen by utilizing liquefied natural gas cold energy. The system comprises a low-temperature Rankine cycle power generation system, an LNG (Liquefied Natural Gas) gasification system and a water electrolysis system. The low-temperature Rankine cycle power generation system, the LNG gasification system and the water electrolysis system are included. The low-temperature Rankine cycle power generation system is used for realizing conversion from the liquefied natural gas cold energy to electric energy, and the generated electric power is used for completing the electrolysis process of water in the water electrolysis system to prepare hydrogen and oxygen, and the LNG gasification system is used for fully exchanging heat by using a high-temperature working medium after expansion acting in the low-temperature Rankine cycle power generation system and absorbing heat for gasification. The technical problems that at present, liquefied natural gas cold energy utilization efficiency is low, water electrolysis hydrogen production cost is high, and hydrogen long-distance conveying is difficult are solved, LNG cold energy power generation and water electrolysis are organically coupled together, a synergistic effect is generated, the defects that LNG cold energy utilization rate is low, and water electrolysis hydrogen production cost is high are overcome, and the system for generating power and producing hydrogen has the effects of improving the LNG cold energy utilization efficiency and improving the hydrogen production efficiency.

Description

technical field [0001] The invention relates to a system for generating hydrogen by utilizing the cold energy of liquefied natural gas, and belongs to the technical fields of renewable energy and natural gas. Background technique [0002] Natural gas generally exists in the form of liquefied natural gas (LNG) during transportation and storage, and needs to be gasified in the LNG receiving station when it is used. During the gasification process, a large amount of cold energy will be released, about 830kWh / kg , which includes both the latent heat of vaporization of LNG and the sensible heat of gaseous natural gas from storage temperature to ambient temperature. If this part of cold energy can be utilized, it will not only save energy and bring significant economic benefits, but also reduce the cold pollution caused by LNG gasification to the environment. The current utilization methods of LNG cold energy include cold energy power generation, light hydrocarbon separation, mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/65C25B9/00C25B1/04F01D15/10C25B15/02
CPCC25B9/65C25B9/00C25B1/04F01D15/10C25B15/02Y02E60/36Y02P20/129Y02P20/133
Inventor 焦文玲刘天杰刘泽坤田兴浩宋斌
Owner HARBIN INST OF TECH