Separation system combining pressure swing adsorption, absorption and membrane separation for steam reformed gas
A pressure swing adsorption and steam reforming technology, applied in the fields of hydrogen separation, carbon compounds, inorganic chemistry, etc., can solve the problems of high concentration, low recovery rate, high concentration, etc., and achieve high H2 yield, good economic benefits and The effect of social benefit
Pending Publication Date: 2019-05-03
DALIAN UNIV OF TECH
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Problems solved by technology
Although the pressure swing adsorption method is flexible in operation and can obtain high-purity H 2 , but it also has some disadvantages: H 2 The concentration of the feed is required to be relatively high, and the recovery rate is not high. At the same time, due to the increase in demand, the device operates at full load for a long time, and the adsorbent is easy to be saturated, which often causes the desorption gas H 2 Problems such as high concentration
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[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0020] see figure 1 , the system of the present invention includes a pressure swing adsorption device, an absorption tower, a 1# circulation pump, a 1# heat exchanger, a desorption tower, a 2# circulation pump, a 2# heat exchanger, and a 3# heat exchanger connected in sequence. Heater, 4# heat exchanger, 1# demister, 1# compressor, 5# heat exchanger, 2# demister, precision filter, hydrogen membrane separator, 6# Heater, 2# compressor, 7# heat exchanger.
[0021] The main components and concentration of the steam reformed gas are 64.3mol% H 2 , 19.15mol% CO 2 , 10.38 mol% CH 4 , 6.17mol% CO and the main component and concentration of membrane permeate gas is 91.02mol% H 2 , 4.82mol% CO 2 , 2.61 mol% CH 4 , 1.55mol% CO i...
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The invention belongs to the technical field of chemical industry, and provides a separation system combining pressure swing adsorption, absorption and membrane separation for a steam reformed gas. The pressure swing adsorption is used for purifying H2, an absorption device is used for purifying CO2, and a membrane separation device is used for improving a concentration of the H2. Coal synthesis gas or natural gas is subjected to steam reforming to obtain a mixed gas, firstly the reformed gas is purified by a pressure swing adsorption device to obtain a high-purity hydrogen product, and a desorbed gas enters the absorption device for separation to obtain a CO2 product; and the desorbed gas of which CO2 is removed by the absorption device enters the hydrogen membrane separation device, membrane permeation is performed to obtain the H2 with an improved concentration, and the obtained H2 returns to the pressure swing adsorption device to obtain a high-purity hydrogen product. The system provided by the invention utilizes a method combining the pressure swing adsorption, the absorption and the membrane separation to realize separation of the hydrogen and carbon dioxide in the steam reformed gas, at the same time, the H2 product and the CO2 product are obtained, and the H2 yield is high; and the system has the advantages of synergistic coupling synergy of a plurality of separation units and very good economic and social benefits.
Description
technical field [0001] The invention belongs to the technical field of chemical industry and relates to a steam reforming gas separation system combined with pressure swing adsorption, absorption and membrane separation. Background technique [0002] h 2 (Hydrogen) is currently one of the most widely used chemical raw materials in the petrochemical field, and is widely used in the production of synthetic ammonia, oil products, methanol, and hydrogenation reactions in petroleum refining processes. At the same time, hydrogen energy, as a clean, efficient, storable and renewable energy, has attracted more and more attention. Coal gasification (or natural gas) hydrogen production is refinery H 2 main source of . [0003] PSA is H 2 It is a common adsorption separation technology in the separation and purification process. It has the following advantages: the product has high purity and can generally work at room temperature and low pressure. This technology develops rapidly ...
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Login to View More IPC IPC(8): C01B3/50C01B32/50
Inventor 肖武庄晨黄伟荣姜晓滨阮雪华贺高红李祥村吴雪梅
Owner DALIAN UNIV OF TECH