CN-122010049-A - Methanol cracking hydrogen production system and control method thereof

CN122010049ACN 122010049 ACN122010049 ACN 122010049ACN-122010049-A

Abstract

The invention belongs to the technical field of methanol cracking hydrogen production devices, and particularly relates to a methanol cracking hydrogen production system and a control method thereof. The methanol pyrolysis hydrogen production system comprises a raw material liquid tank, a desalination water tank, a reaction system and a water scrubber, wherein the raw material liquid tank is provided with a methanol inlet, a first washing water inlet and a raw material liquid outlet, the methanol inlet is connected with a methanol inlet pipe, a pneumatic ball valve is arranged on the methanol inlet pipe, the desalination water tank is provided with a desalted water inlet, a second washing water inlet and a desalted water outlet, the desalted water inlet is connected with the desalted water inlet pipe, the desalted water inlet pipe is provided with the pneumatic ball valve, the washing water outlet of the water scrubber is connected with a washing water outlet pipe, one washing water outlet pipe is divided into two paths, one path is connected with the first washing water inlet through a first pipeline, the other path is connected with the second washing water inlet through a second pipeline, and the pneumatic ball valves are arranged on the first pipeline and the second pipeline. Compared with the traditional process, the methanol pyrolysis hydrogen production system and the control method thereof have the advantages of flexible arrangement and thorough leaching.

Inventors

LI YUJIE
QIAO NINGNING
ZHANG YU
GAO CHAOFENG
WANG JIAN
WANG YAHENG
HUANG YUJIE

Assignees

中船(邯郸)派瑞氢能科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260128
Priority Date: 20251113

Claims (6)

1. The methanol pyrolysis hydrogen production system is characterized by comprising a raw material liquid tank, a desalting water tank, a reaction system and a water washing tower; the raw material liquid tank is provided with a methanol inlet, a first washing water inlet and a raw material liquid outlet, wherein the methanol inlet is connected with a methanol inlet pipe, and a methanol pneumatic ball valve is arranged on the methanol inlet pipe; The desalination water tank is provided with a desalted water inlet, a second washing water inlet and a desalted water outlet, wherein the desalted water inlet is connected with a desalted water inlet pipe, a desalted water pneumatic ball valve is arranged on the desalted water inlet pipe, and the desalted water outlet is communicated with the washing water inlet of the water washing tower through a pipeline; the washing water outlet of the water washing tower is connected with a washing water outlet pipe, the washing water outlet pipe is divided into two paths, one path is connected with the first washing water inlet through a first pipeline, the other path is connected with the second washing water inlet through a second pipeline, and the first pipeline and the second pipeline are respectively provided with a washing water pneumatic ball valve.
2. The methanol cracking hydrogen production system of claim 1 wherein a desalination water pump is provided on a conduit communicating with a wash water inlet of the water scrubber.
3. The methanol cracking hydrogen production system as in claim 1 or 2 wherein a methanol regulator valve is also provided on the methanol inlet tube.
4. The methanol cracking hydrogen production system as in claim 1 or 2 wherein a wash water regulating valve is provided on the wash water outlet pipe.
5. The methanol cracking hydrogen production system as in claim 1 or 2 wherein the feed stock tank and the desalination water tank are each provided with a level gauge.
6. A method of controlling a methanol cracking hydrogen production system as in any one of claims 1-5 comprising: when the liquid level in the raw material liquid tank is lower than or equal to a preset low liquid level, the methanol pneumatic ball valve and the washing water pneumatic ball valve on the first pipeline are re-opened, and the washing water pneumatic ball valve on the second pipeline is closed; when the liquid level in the desalination water tank is larger than or equal to the preset high liquid level, the desalination water pneumatic ball valve is closed, and when the liquid level in the desalination water tank is smaller than or equal to the preset low liquid level, the desalination water pneumatic ball valve is opened again.

Description

Methanol cracking hydrogen production system and control method thereof Technical Field The invention belongs to the technical field of methanol cracking hydrogen production devices, and particularly relates to a methanol cracking hydrogen production system and a control method thereof. Background Methanol cracking hydrogen production facilities are a means for converting methanol to hydrogen, and as such, technology and applications have evolved and improved significantly over the past decades because they provide a relatively cost effective method for producing hydrogen, especially in the face of cost-up or environmental constraints in other conventional hydrogen production processes such as electrolyzed water hydrogen production, natural gas vapor reforming hydrogen production, and coal hydrogen production. In the whole process flow of hydrogen production by methanol pyrolysis, traditional ingredients and leaching are separated, as shown in fig. 1, methanol and desalted water are respectively led into a methanol tank and a desalted water tank in the boundary region from the outside of the boundary region, then the methanol tank is placed at a high position, the desalted water tank is placed at a low position, the methanol and the desalted water are mixed in a pipeline in a self-flowing mode and then enter a reaction system, the proportion of the methanol and the desalted water in the process is controlled by controlling the flow rate of the methanol and the flow rate of the raw material liquid, then the steps of pressurization, heat exchange, reaction, cooling and the like are respectively carried out in the reaction system to obtain decomposed gas, finally the decomposed gas is sent into a water washing tower, a certain amount of desalted water is extracted from the desalted water tank by a desalted water pump to sufficiently leach the decomposed gas, unreacted methanol is washed off, and the leached water is returned to the desalted water tank. Although the traditional method can realize the batching of the methanol and the desalted water and the leaching of the decomposed gas, the storage height of the methanol tank and the length of a mixing pipeline of the methanol and the desalted water are needed to be considered during the arrangement, and the phenomenon of uneven mixing is easy to cause. In addition, the leached desalted water (containing a trace amount of methanol) is returned to the desalted water tank, so that the desalted water tank contains a trace amount of methanol, and if the reaction of the methanol and the desalted water is insufficient, the methanol content in the water washing tower is higher, so that the methanol in the desalted water tank is accumulated, and the desalted water in the desalted water tank needs to be replaced again after stopping, thereby being unfavorable for the normal operation of equipment. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a methanol pyrolysis hydrogen production system and a control method thereof, which modify the process pipeline on the traditional process flow and change the control method at the same time, and have the advantages of flexible arrangement and thorough leaching. Specifically, the invention provides the following technical scheme: a system for producing hydrogen by methanol pyrolysis comprises a raw material liquid tank, a desalting water tank, a reaction system and a water washing tower; the raw material liquid tank is provided with a methanol inlet, a first washing water inlet and a raw material liquid outlet, wherein the methanol inlet is connected with a methanol inlet pipe, and a methanol pneumatic ball valve is arranged on the methanol inlet pipe; The desalination water tank is provided with a desalted water inlet, a second washing water inlet and a desalted water outlet, wherein the desalted water inlet is connected with a desalted water inlet pipe, a desalted water pneumatic ball valve is arranged on the desalted water inlet pipe, and the desalted water outlet is communicated with the washing water inlet of the water washing tower through a pipeline; the washing water outlet of the water washing tower is connected with a washing water outlet pipe, the washing water outlet pipe is divided into two paths, one path is connected with the first washing water inlet through a first pipeline, the other path is connected with the second washing water inlet through a second pipeline, and the first pipeline and the second pipeline are respectively provided with a washing water pneumatic ball valve. The invention provides a methanol pyrolysis hydrogen production system, which utilizes the high pressure of a water scrubber and boundary region methanol to convey the boundary region pressurized methanol and washing water discharged from the water scrubber to a raw material liquid tank according to a certain proportion, and utilizes the characteristic of infinite mutual solubility of the methanol and