Cryogenic separation method and cryogenic separation device for preparing low-purity oxygen from air
A separation method and technology of separation device, which are applied in cold treatment separation, refrigeration and liquefaction, liquefaction and other directions, can solve the problems of high energy consumption, restrict the large-scale environmental protection application of oxygen, etc., and achieve the effect of reducing energy consumption
Active Publication Date: 2012-12-05
四川空分设备(集团)有限责任公司
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Problems solved by technology
At present, the double-tower rectification used in conventional cryogenic separation has high energy consumption, which restricts the large-scale environmental protection application of low-purity oxygen.
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[0030] The following non-limiting examples illustrate the invention.
[0031] A cryogenic separation method for producing low-purity oxygen (90-97%) from air. The air is filtered and compressed into two paths of air with different pressure levels. The lower-pressure air is cooled, and the purified part is further cooled. After that, it enters the medium-pressure tower for rectification, and the other part is further cooled and depressurized and then enters the low-pressure tower for rectification, and the low-temperature separation of oxygen and nitrogen is carried out respectively; in addition, the higher-pressure air is cooled, purified, pressurized and further cooled, and then enters the high-pressure tower respectively. Column and medium-pressure column rectification, respectively for low-temperature separation of oxygen and nitrogen. Wherein, the pressure of the lower pressure air is 0.28-0.35MPa.A, and the pressure of the higher pressure air is 0.55-0.59MPa.A. The lower...
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The invention discloses a cryogenic separation method and a cryogenic separation device for preparing low-purity oxygen from air, and belongs to the field of gas separation methods and devices. The cryogenic separation method includes compressing filtered air into two channels of air at different pressure levels; leading the channel of air with low pressure into a medium-pressure tower and a low-pressure tower to be rectified respectively; and leading the channel of air with high pressure into a high-pressure tower and the medium-pressure tower to be rectified respectively. The cryogenic separation device comprises an air filter and compression system, air precooling systems, air purification systems and a rectifying system. The rectifying system comprises a main heat-exchanger, the high-pressure tower, the low-pressure tower, a main condensing evaporator, a subcooler and the medium-pressure tower, the air is compressed into the two channels of air at the different pressure levels by the air filter and compression system, and each channel of air is sequentially connected with the corresponding air precooling system and the corresponding air purification system respectively, and then is connected with the rectifying system. The cryogenic separation method and the cryogenic separation device for preparing the low-purity oxygen from the air are low in energy consumption.
Description
technical field [0001] The invention belongs to the field of gas separation methods and devices, in particular to a method and device for preparing low-purity oxygen (90-97%) from air. Background technique [0002] Since entering the 21st century, due to the rapid growth of the national economy and the great development of upstream industries such as iron and steel, coal chemical industry and petrochemical industry, the demand for air separation equipment has been strong, which has led to the rapid growth of the air separation equipment industry. According to incomplete statistics, the air separation equipment Production capacity has reached 4 million Nm per year 3 / h above. According to the data, the oxygen production capacity of the air separation equipment required by my country's coal chemical industry in 2015 is 6 million / Nm 3 / h or so, the market space for this alone is astonishingly large. [0003] Safety and reliability, energy saving and emission reduction are th...
Claims
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IPC IPC(8): F25J3/04
CPCF25J3/04157F25J3/04169F25J3/0429F25J3/04303F25J3/04448F25J3/04957F25J2200/54F25J2205/32F25J2205/34F25J2205/62
Inventor 黄科谢波魏义江
Owner 四川空分设备(集团)有限责任公司