阅读说明：本技术 甲醇高效制氢工艺方法 (High-efficiency hydrogen production process by using methanol ) 是由 王承东 陈天晓 于 2021-09-16 设计创作，主要内容包括：本发明提供了甲醇高效制氢工艺方法,包括：1)将甲醇与去离子水按照甲醇35％、去离子水65％的重量百分比搅拌混合,换热至105～150℃；2)180～200℃汽化、280～320℃过热,280～320℃反应制氢；3)产品换热至95～120℃后,再冷却至25～40℃；4)气液分离并干燥气体,得到混合氢气；5)变压吸附后得到提纯氢气。本发明降低了甲醇的消耗量和能耗,安全环保,且保证了制氢的纯度。(The invention provides a process method for efficiently producing hydrogen from methanol, which comprises the following steps: 1) stirring and mixing methanol and deionized water according to the weight percentage of 35% of methanol and 65% of deionized water, and carrying out heat exchange to 105-150 ℃; 2) vaporizing at 180-200 ℃, overheating at 280-320 ℃, and reacting at 280-320 ℃ to produce hydrogen; 3) after heat exchange of the product is carried out to 95-120 ℃, cooling to 25-40 ℃; 4) gas-liquid separation and gas drying are carried out to obtain mixed hydrogen; 5) obtaining purified hydrogen after pressure swing adsorption. The method reduces the consumption and energy consumption of the methanol, is safe and environment-friendly, and ensures the purity of the hydrogen production.)

1. The process method for efficiently producing hydrogen from methanol comprises the following steps:

1) stirring and mixing methanol and deionized water according to the weight percentage of 35% of methanol and 65% of deionized water, and carrying out heat exchange to 105-150 ℃;

2) vaporizing at 180-200 ℃, overheating at 280-320 ℃, and reacting at 280-320 ℃ to produce hydrogen;

3) after heat exchange of the product is carried out to 95-120 ℃, cooling to 25-40 ℃;

4) gas-liquid separation and gas drying are carried out to obtain mixed hydrogen;

5) obtaining purified hydrogen after pressure swing adsorption.

2. The process for efficient production of hydrogen from methanol as claimed in claim 1, wherein the methanol is 99.9% pure methanol.

3. The efficient hydrogen production process by using methanol as claimed in claim 1, wherein the raw material mixed in step 1) is delivered to a heat exchanger by a raw material pump for heat exchange, and the outlet pressure of the raw material pump is 0.95-1.1 Mpa.

4. The process for efficiently producing hydrogen from methanol according to claim 1 or 3, wherein in step 2), the vaporization and superheating are performed in a heating furnace, the heating furnace comprises a convection chamber and a radiation chamber, the convection chamber is a vaporization section, and the radiation chamber is a superheating section.

5. The efficient hydrogen production process by using methanol according to claim 1, wherein in the step 4), the hydrogen purity of the mixed hydrogen is 68-72%.

6. The process method for efficiently producing hydrogen from methanol according to claim 1 or 5, wherein the purity of the purified hydrogen in the step 5) is 99-99.999%.

7. The process for efficiently producing hydrogen from methanol according to claim 1, wherein step 5) further comprises transporting the obtained purified hydrogen out through a hydrogen buffer.

Technical Field

The invention belongs to the technical field of methanol hydrogen production, and relates to a methanol efficient hydrogen production process method.

Background

The methanol and steam pass through a catalyst under certain temperature and pressure conditions, and under the action of the catalyst, methanol cracking reaction and carbon monoxide shift reaction are carried out to generate hydrogen and carbon dioxide, which is a multi-component and multi-reaction gas-solid catalytic reaction system. The reaction equation is as follows:

CH₃OH→CO+2H₂ (1)

H₂O+CO→CO₂+H₂ (2)

CH₃OH+H₂O→CO₂+3H₂ (3)

h formed by reforming reaction₂And CO₂Then subjecting the H to Pressure Swing Adsorption (PSA)₂And CO₂Separating to obtain high-purity hydrogen.

There are two ways to industrially produce hydrogen from methanol: methanol decomposition, partial oxidation of methanol and steam reforming of methanol.

The hydrogen production by methanol steam reforming has high hydrogen yield (the hydrogen composition of the product can be close to 75 percent as can be seen from the reaction formula), reasonable energy utilization, simple process control and convenient industrial operation, and is more adopted.

In the existing hydrogen production process, the consumption standard of methanol for producing hydrogen of each standard square is 760 g, the consumption standard is slightly reduced along with the technical progress, and the methanol consumption and the energy consumption are still main factors for restricting the high cost of the methanol hydrogen production.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a process method for efficiently producing hydrogen by using methanol, which reduces the consumption and energy consumption of the methanol, is safe and environment-friendly and ensures the purity of hydrogen production.

In order to achieve the purpose, the invention adopts the technical scheme that:

the process method for efficiently producing hydrogen from methanol comprises the following steps:

1) stirring and mixing methanol and deionized water according to the weight percentage of 35% of methanol and 65% of deionized water, and carrying out heat exchange to 105-150 ℃;

2) vaporizing at 180-200 ℃, overheating at 280-320 ℃, and reacting at 280-320 ℃ to produce hydrogen;

3) after heat exchange of the product is carried out to 95-120 ℃, cooling to 25-40 ℃;

4) gas-liquid separation and gas drying are carried out to obtain mixed hydrogen;

5) obtaining purified hydrogen after pressure swing adsorption.

Preferably, the methanol is 99.9% pure methanol.

Preferably, the raw materials mixed in the step 1) are conveyed to a heat exchanger by a raw material pump for heat exchange, and the outlet pressure of the raw material pump is 0.95-1.1 MPa.

Preferably, in step 2), the vaporization and the superheating are performed in a heating furnace, the heating furnace comprises a convection chamber and a radiation chamber, the convection chamber is a vaporization section, and the radiation chamber is a superheating section.

Preferably, in the step 4), the hydrogen purity of the mixed hydrogen is 68-72%.

Preferably, the purity of the purified hydrogen in the step 5) is 99-99.999%.

Preferably, step 5) further comprises outputting the obtained purified hydrogen gas through a hydrogen buffer.

The invention has the following beneficial effects:

1. the process conditions are changed, hydrogen production and hydrogen use are synchronized, and low-pressure hydrogen can be directly supplied.

2. The process equipment is optimized, the hydrogen compressor and the high-pressure gas tank are omitted, the energy consumption is reduced, and the safety is improved.

3. The methanol consumption is reduced, and the methanol consumption of each standard square is less than or equal to 320 g.

4. The molar ratio of water to methanol in the raw materials is improved, and the ratio of water: the molar ratio of the alcohol is between 2.5 and 3.5.

5. The purity of the hydrogen is ensured, and the purity of the product can reach 99.9-99.999%.

Drawings

FIG. 1 is a schematic diagram of a methanol skid-mounted hydrogen production machine employed in an embodiment of the present invention, wherein:

1. a raw material tank, 2, a metering tank, 3, a blending tank, 4, a heating furnace, 5, a reactor, 6, a heat exchanger, 7, a cooler, 8, a separator, 9, a pressure swing adsorption device, 10, a hydrogen buffer, 11, a raw material pump, 12 and a blending pump.

Detailed Description

In order to more clearly illustrate the present invention, the present invention will be described in further detail below with reference to examples and the accompanying drawings. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

Examples

With reference to fig. 1, the process for efficiently producing hydrogen from methanol according to the present invention comprises the following steps:

1) stirring and mixing methanol and deionized water according to the weight percentage of 35% of methanol and 65% of deionized water, and carrying out heat exchange to 105-150 ℃; the raw material for preparing hydrogen from methanol adopts methanol with the purity of 99.9 percent, the weight of the methanol and deionized water can be measured by the measuring tank 2, then the methanol and the deionized water are conveyed to the blending tank 3 to be stirred and mixed, and are output to the raw material tank 1 by the blending pump 12, and then are conveyed to the heat exchanger 6 for heat exchange by the raw material pump 11 (the outlet pressure is 0.95-1.1 Mpa).

2) Vaporizing at 180-200 ℃, overheating at 280-320 ℃, and reacting at 280-320 ℃ to produce hydrogen; the raw material can be conveyed to the heating furnace 4 through the outlet of the heat exchanger 6 for vaporization and superheating, the heating furnace 4 comprises a convection chamber (vaporization section) and a radiation chamber (superheating section), and then the raw material is conveyed to the reactor 5 from the outlet of the heating furnace 4 for reaction to produce hydrogen.

3) After heat exchange of the product is carried out to 95-120 ℃, cooling to 25-40 ℃; in this step, the product may be transferred from the reactor 5 to a heat exchanger 6 for heat exchange and then transferred from the heat exchanger 6 to a cooler 7 for cooling.

4) And conveying the cooled product from the outlet of the cooler to a separator 8 for gas-liquid separation, and drying the gas to obtain mixed hydrogen with the purity of 68-72%.

5) The mixed hydrogen is further conveyed to a pressure swing adsorption device 9 for adsorption, desorption and purification, so that purified hydrogen with the purity of 99-99.999% is obtained, and the purified hydrogen is buffered and stabilized by a hydrogen buffer 10 and then is output.

Compared with the traditional methanol hydrogen production process, the first step of the process is to adopt a high water-alcohol ratio, and the water consumption is increased from 40% to 65%; secondly, the consumption of methanol is reduced, and the consumption of the methanol is reduced from more than 60 percent to 35 percent; thirdly, the heating furnace is adopted for heating, so that the energy consumption is reduced.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all the embodiments of the present invention are not exhaustive, and all the obvious variations or modifications which are introduced in the technical scheme of the present invention are within the scope of the present invention.