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System and method for extracting helium from natural gas

A natural gas and helium technology, applied in the field of helium extraction, can solve the problems of helium economic value decline and high energy consumption

Pending Publication Date: 2020-10-30
上海联风气体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some BOG gases will contain a small amount of hydrogen, and the use of cryogenic methods to separate helium and hydrogen requires high energy consumption, which will reduce the economic value of helium

Method used

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  • System and method for extracting helium from natural gas

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the present embodiment provides a system for extracting helium from natural gas, including an air expander 1, a cooler 2, a cold box 3, and a helium purification system; the cold box 3 includes an E1 main heat exchanger 4, a C1 refined Distillation tower 7, K1 air reboiler 5 and K2 LNG reboiler 6, E2 subcooler 8, K3 condensing evaporator 9 arranged at the bottom of C1 rectification tower 7; A furnace 10 , a cooler 11 , a helium gas purifier 12 , a compressor 13 and a Dewar vessel 14 . The Dewar vessel 14 is provided with a heat exchanger 15 , a gas-liquid separator 16 and an adsorber 17 .

[0031] The pipeline connection sequence is:

[0032] The booster end of the air expander 1, the cooler 2, and the air inlet port at the top of the E1 main heat exchanger 4 are connected sequentially, and the air outlet port in the middle of the E1 main heat exchanger 4 passes through the K1 air reboiler 5 and then exchanges heat with the E1 main heat excha...

Embodiment 2

[0040] Using the system provided in Embodiment 1, this embodiment provides a method for extracting helium from natural gas:

[0041] The air is compressed, precooled and purified (compression and precooled purification of air are conventional techniques in air separation, and will not be described in the present invention), and after removing water and carbon dioxide, the obtained pressure is 0-0.7MPaA (absolute pressure, the same below). ), the flow rate is 4800Nm 3 / h, dry air at a temperature of 10-20°C. The above-mentioned dry air enters the inlet of the booster end of the air expander 1 through the pipeline GA-101, and after being pressurized to 0.9-1MPaA, enters the cooler 2 to cool down to 40°C, and is sent to the cold box 3 through the pipeline GA-103. The air entering the cold box 3 first enters the E1 main heat exchanger 4 to cool down to -107~-109°C, is extracted from the middle part of the E1 main heat exchanger 4, and then sent to the K1 air reboiler 5, using the...

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Abstract

The invention discloses a system and a method for extracting helium from natural gas. The system comprises an air expander, a cooler, a cool box, a helium purification system. The cool box comprises amain heat exchanger E1, a rectification tower C1, an air reboiler K1 and an LNG reboiler K2, a subcooler E2, and a condensing evaporator K3 arranged at the bottom of the rectification tower C1. A helium purification system comprises an oxygenation and a hydrogen removal reactor, a cooler, a helium purifier, a compressor and a Dewar. The inner of the Dewar is provided with a heat exchanger, a gas-liquid separator and an adsorber. The invention further provides a method for extracting helium from natural gas. The process design is reasonable, the operation is simple, the helium extraction rateis high, the problem of concentration of hydrogen-containing raw materials is solved, the pure helium is produced by low-temperature adsorption, and provides the economic value of the product.

Description

technical field [0001] The invention relates to the technical field of helium extraction, in particular to a system and method for extracting helium from natural gas. Background technique [0002] Helium is a strategic substance that plays a very important role in the fields of aerospace, national defense, medical treatment and leak detection. Helium is an inert gas, its content in air is only 5.24×10 -6 . Helium is a non-condensable gas in the rectification column of the air separation plant, but it accumulates in the top of the main condenser and in the nitrogen reflux liquid in a gaseous state, and is not easy to be separated. Helium mainly exists in natural gas, and extracting helium from natural gas is the main method of helium production. However, the helium content in natural gas in China is very small, and the flash gas (BOG) of liquefied natural gas (BOG) or other chemical tail gases that use natural gas as raw material is rich in helium, and the economic value e...

Claims

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Application Information

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IPC IPC(8): F25J3/02
CPCF25J3/0214F25J3/029F25J2210/62F25J2215/30F25J3/0209F25J3/0233F25J3/08F25J2200/02F25J2200/40F25J2200/50F25J2200/74F25J2205/40F25J2205/60F25J2205/82F25J2210/40F25J2210/90F25J2230/40F25J2240/10F25J2250/10F25J2270/12F25J2270/14F25J2270/904
Inventor 张正雄郝文炳
Owner 上海联风气体有限公司
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