High-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization

A technology for low-temperature crushing and waste tires, which is used in refrigerators, refrigeration and liquefaction, compressors, etc., can solve the problems of ice blockage, inability to meet the needs of producing fine rubber powder, and high temperature of cold energy when natural gas is cooled in pipelines. The effect of saving investment and operating costs, promoting recycling, and reducing operating costs

Active Publication Date: 2014-03-12
JINAN UNIVERSITY
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  • Claims
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Problems solved by technology

[0016] In order to overcome the above-mentioned existing high-pressure natural gas pressure energy utilization method, the efficiency is low, the cooling of pipeline natural gas is easy to cause ice blockage, the temperature of cold energy is high, and the problems that cannot meet the needs of producing fine rubber powder, the purpose of the present invention The purpose is to provide a refrigerat

Method used

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  • High-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization
  • High-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization
  • High-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization

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[0049] Example one

[0050] A high-pressure natural gas pressure energy refrigeration method for low-temperature crushing of waste tires. The process flow is as follows figure 1 As shown, two expanders are used to achieve a two-stage depressurization of high-pressure natural gas, and nitrogen is used as the refrigerant.

[0051] The pressure of the high-pressure natural gas transported from the main natural gas pipeline network (high-pressure pipeline network) to the urban natural gas pressure regulating station is 4.0MPa (absolute pressure), the temperature is 15.0℃, and its volume composition is: methane 94.844%, ethane 2.353%, and propane 0.309 %, butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; the water dew point of the pipeline natural gas at 4.0MPa is 5.0℃, and the water dew point at 0.5MPa It is -15.0°C. In the natural gas pressure regulating station, the 4.0MPa high-pressure natural gas needs to be depressurized to 0.5MPa ...

Example Embodiment

[0060] Example two

[0061] A high-pressure natural gas pressure energy refrigeration method for low-temperature crushing of waste tires. The process flow is as follows figure 2 As shown, an expander is used, and the refrigerant is nitrogen.

[0062] The pressure of the natural gas transported from the main natural gas pipeline network (high-pressure pipeline network) to the urban natural gas pressure regulating station is 1.6MPa (absolute pressure), the temperature is 15.0℃, and its volume composition is: methane 94.844%, ethane 2.353%, and propane 0.309% , Butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; the water dew point of the pipeline natural gas at 1.6MPa is -2.7℃, the water dew point at 0.5MPa It is -15.0°C. In the natural gas pressure regulating station, 1.6MPa high-pressure natural gas needs to be depressurized to 0.5MPa before entering the urban medium-pressure natural gas pipeline network (medium-pressure pipeline net...

Example Embodiment

[0071] Example three

[0072] A high-pressure natural gas pressure energy refrigeration method for low-temperature crushing of waste tires. The process flow is as follows image 3 As shown, two expanders are used, and the refrigerant is air.

[0073] The pressure of natural gas transported from the main natural gas pipeline network (high-pressure pipeline network) to the urban natural gas pressure regulating station is 4.0MPa (absolute pressure), the temperature is 15.0℃, and its volume composition is: methane 94.844%, ethane 2.353%, and propane 0.309% , Butane 0.079%, pentane 0.042%, hexane 0.032%, nitrogen 1.656%, carbon dioxide 0.655%, water 0.03%; the water dew point of this pipeline natural gas at 4.0MPa is 5.0℃, and the water dew point at 0.5MPa is -15.0°C. In the natural gas pressure regulating station, the 4.0MPa high-pressure natural gas needs to be depressurized to 0.5MPa before entering the urban medium-pressure natural gas pipeline network (medium-pressure pipeline net...

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Abstract

The invention relates to a high-pressure natural gas pressure energy refrigeration method for junked tire cryogenic pulverization. The pressure energy of high-pressure natural gas is converted into mechanical work and cold energy through an expansion machine in a natural gas regulator station. The mechanical work and the cold energy are recycled through refrigerants, the mechanical work is used for compressing the refrigerants, the compressed high-pressure refrigerants are cooled through an optimally-designed heat exchange network through the cold energy generated through the expansion of the high-pressure natural gas, the gas inlet temperature of the high-pressure natural gas entering the expansion machine is improved, and the mechanical work generated by the expansion of the high-pressure natural gas is increased. The cooled high-pressure refrigerants are conveyed to a junked tire cryogenic pulverization area through a heat preservation pipeline, low-temperature cold energy below -100DEG C is generated by the high-pressure refrigerants through the refrigerant expansion machine, the mechanical work generated by the expansion of the high-pressure refrigerants is used for the primary pressure boost of the refrigerants with the cold energy used up, the refrigerants are conveyed back to the natural gas regulator station, and a refrigerating cycle is formed. The high-pressure natural gas pressure energy refrigeration method has the advantages of effectively utilizing energy and preventing ice blockage, and belongs to the field of natural gas pressure energy utilization.

Description

technical field [0001] The invention relates to the field of utilization of natural gas pressure energy, in particular to a high-pressure natural gas pressure energy refrigeration method for low-temperature crushing of waste tires. Background technique [0002] With the rapid development of the automobile industry, the annual output of tires in my country has exceeded 150 million, ranking third in the world after the United States and Japan. The annual production of waste tires has exceeded 100 million, and is growing at a double-digit rate every year. The accumulation of a large number of waste tires takes up land, which not only causes a waste of resources, but also because waste tires are thermosetting polymer materials, it is difficult to degrade, and the increasing "black pollution" has made our country's already fragile ecological environment worse. On the other hand, my country's rubber resources are very scarce, and rubber raw materials are mainly imported to meet th...

Claims

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Application Information

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IPC IPC(8): F25B9/06F25B27/00
Inventor 熊永强
Owner JINAN UNIVERSITY
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