阅读说明：本技术 制备甲醇合成气的方法 (Method for preparing methanol synthesis gas ) 是由 P·J·达尔 T·罗斯特鲁普-尼尔森 于 2020-01-16 设计创作，主要内容包括：制备甲醇合成气的方法,其包括以下步骤：(a)提供包含烃和蒸汽的第一进料流；(b)提供包含二氧化碳的第二进料流,二氧化碳的量在第二进料流与第一物流混合时导致二氧化碳/烃比率介于01.和0.8之间,优选介于0.15和0.7之间；(d)将第一物流和第二物流引入包括蒸汽转化步骤和自热转化步骤的两步蒸汽转化阶段；(e)排出第一合成气流；(f)提供包含氢气的第三进料流；和(g)应用第一合成气流和第三进料流作为甲醇合成气。本发明另外提供改造现有的甲醇合成气装置的方法,其适用于实施根据本发明的第一方面的制备甲醇合成气的方法。(A process for the preparation of methanol synthesis gas comprising the steps of: (a) providing a first feed stream comprising a hydrocarbon and steam; (b) providing a second feed stream comprising carbon dioxide in an amount that results in a carbon dioxide/hydrocarbon ratio of between 01 and 0.8, preferably between 0.15 and 0.7, when the second feed stream is mixed with the first stream; (d) introducing the first stream and the second stream into a two-step steam reforming stage comprising a steam reforming step and an autothermal reforming step; (e) discharging a first syngas stream; (f) providing a third feed stream comprising hydrogen; and (g) using the first synthesis gas stream and the third feed stream as methanol synthesis gas. The present invention additionally provides a method of retrofitting an existing methanol synthesis gas plant which is suitable for carrying out the method of preparing methanol synthesis gas according to the first aspect of the invention.)

1. A process for the preparation of methanol synthesis gas comprising the steps of:

(a) providing a first feed stream comprising a hydrocarbon and steam;

(b) providing a second feed stream comprising carbon dioxide in an amount resulting in a carbon dioxide/hydrocarbon ratio of between 01 and 0.8, preferably between 0.15 and 0.7, when said second feed stream is mixed with said first stream;

(d) said first stream and said second stream are introduced into a two-step steam reforming stage comprising a steam reforming step and an autothermal reforming step;

(e) discharging a first syngas stream;

(f) providing a third feed stream comprising hydrogen; and

(g) the first syngas stream is used with the third feed stream as methanol syngas.

2. The process of claim 1, wherein in step (d) the first feed stream and a portion or all of the second feed stream are mixed upstream of the steam reforming step.

3. The process of claim 1 or 2, wherein a portion or all of the second stream is added to the converted first stream upstream of the autothermal conversion step.

4. The process of any one of claims 1 to 3, wherein the third feed stream comprising hydrogen is provided by one or more of:

(a) steam reforming of a stream comprising hydrocarbons and steam arranged in parallel to a two-step reforming process;

(b) electrolysis of steam or water;

(c) an external source of hydrogen gas.

5. The process according to claim 4, wherein in (a) a further stream comprising carbon dioxide is added to the stream comprising hydrocarbons upstream of the steam reforming.

6. A process according to any one of claims 1 to 5, wherein a further stream comprising carbon dioxide is added to the third stream comprising hydrogen.

7. The method of any of claims 1-6, wherein the modulus M of the first syngas<2.0, preferably 1.4<M<1.9, wherein M is (H)₂-CO₂)/(CO+CO₂)。

8. The process of any of claims 1-7, wherein the modulus M in the third stream comprising hydrogen is greater than the modulus M in the first syngas.

9. The process according to any one of claims 1 to 8, wherein hydrogen and optionally added CO are contained₂Of the third stream M>2.0。

10. The method of any one of claims 1 to 9, wherein the first syngas stream and the syngas stream with optional added CO₂The modulus M of the mixture of the third stream of (a) is between 1.8 and 2.3.

11. The process according to any one of claims 1 to 10, wherein the carbon dioxide in the second feed stream or the further stream comprising carbon dioxide added to the third feed stream is obtained from a flue gas or an exhaust gas.

12. The process according to any one of claims 1 to 11, wherein the steam reforming process is carried out in a tubular reformer, a intubator reformer or a convection reformer.

13. The method of any one of claims 1 to 12, wherein the first syngas stream and the stream with optional added CO are combined in a further step₂The third stream of (a) is converted to a methanol product.

14. A method of retrofitting an existing methanol synthesis gas plant, comprising:

adding a steam reformer section and/or an electrolysis unit and/or a line to an external source of hydrogen in parallel to the existing two-step reforming section;

connecting the existing two-step steam reforming section to a line connected to a carbon dioxide source and optionally connecting an additional steam reformer section and/or electrolysis unit and/or a line connected to an external source of hydrogen to a line connected to a carbon dioxide source; and

the outlet lines of the existing two-step reforming section and the outlet lines of the added steam reformer and/or electrolysis unit and/or pipeline hydrogen source are connected to a methanol synthesis plant.