Device for preparing natural gas and hydrogen through methanol to olefin methane tail gas
A technology for olefin methane and natural gas, applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction, etc., can solve problems such as unsatisfactory recovery needs, and achieve the effects of increasing device revenue, reducing consumption, and reducing operating costs
Pending Publication Date: 2018-10-19
北京恒泰洁能科技有限公司
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Problems solved by technology
At present, there is no device for recovering methane tail gas from methanol to olefins. Similar to the Chinese patent CN200810145954.6, the synthesis gas separation and LNG production method and system can separate the feed gas stream containing carbon monoxide, hydrogen and methane into carbon monoxide and Hydrogen gas stream and liquefied gas stream containing methane, but cannot meet the requirement of recovering methanol-to-olefin methane tail gas of the present invention
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[0015] Below in conjunction with accompanying drawing, invention is described in further detail.
[0016] figure 1 with figure 2 Schematically shows a device for producing natural gas and hydrogen from methanol-to-olefins methane tail gas according to an embodiment of the present invention.
[0017] refer to figure 1 with figure 2 The device for preparing natural gas and hydrogen from methane tail gas from methanol to olefins includes a primary heat exchanger 1, a secondary heat exchanger 2, a primary gas-liquid separator 3, a secondary gas-liquid separator 4, a rectification tower 5, and a Hydrogen unit 6, methanation unit 7, drying unit 8, refrigeration system 9, inlet pipe 10, product natural gas output pipeline 11, mixed hydrocarbon output pipeline 12, tail gas output pipeline 13 and tower top condenser 14.
[0018] The inlet pipe 10 is connected to the feeding end of the primary gas-liquid separator 3 through the primary heat exchanger 1 , and the feeding end of the...
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The invention discloses a device for preparing natural gas and hydrogen through methanol to olefin methane tail gas. The device comprises a first-level heat exchanger, a second-level heat exchanger, afirst-level gas-liquid separator, a second-level gas-liquid separator, a rectifying tower, a hydrogen extraction unit, a methanation unit, a drying unit and a gas inlet pipe. The gas inlet pipe is connected with the first-level gas-liquid separator, the first-level gas-liquid separator is connected with the rectifying tower, the rectifying tower is connected with the hydrogen extraction unit, thehydrogen extraction unit is connected with the methanation unit, and the methanation unit is connected with the second-level gas-liquid separator. A low-temperature separation and hydrogen extractiondevice extracts methane, hydrogen, C2 and C2+ in the methanol to olefin methane tail gas, the C2 and C2+ olefin type liquid returns to a main olefin separation device, raw material consumption is reduced, and the operation cost is reduced. Effective components in the tail gas are recycled through the technology, recycling of all tail gas can be achieved, the income of the device is increased, andgood economic benefits are achieved.
Description
technical field [0001] The invention relates to the field of methanol-to-olefins in the coal chemical industry, in particular to a device for producing natural gas and hydrogen from methanol-to-olefins methane tail gas. Background technique [0002] At present, more than 20 sets of methanol-to-olefins units have been built and put into operation in my country, and there are 11 sets of projects under construction. Based on the characteristics of low carbon content of methanol-to-olefins products and the requirements of investment and operating costs, all the units that have been put into operation and are under construction Most of the methanol-to-olefins projects only use the propylene refrigeration process, instead of the cascade refrigeration or mixed refrigeration process of propylene plus ethylene. It is difficult to effectively separate carbon 1 and carbon 2. In order to avoid the loss of ethylene, relatively low-priced supercooled liquid carbon 3 and carbon 4 are used fo...
Claims
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IPC IPC(8): F25J3/02
CPCF25J3/0219F25J3/0252F25J3/0233F25J3/0238F25J2200/74F25J2205/04F25J2205/40F25J2205/64F25J2205/80F25J2210/12F25J2215/04F25J2270/12F25J2270/42F25J2270/66
Inventor 裴栋中张志杰
Owner 北京恒泰洁能科技有限公司