Hengzhong hydrogen production unit for natural gas

Introduction

The hydrogen production process of natural gas mainly includes four processes: feed gas pretreatment, natural gas steam conversion, carbon monoxide conversion and hydrogen purification.

The first step is the raw material pretreatment . The pretreatment here mainly refers to the desulfurization of the raw gas. In the actual process operation, the natural gas cobalt molybdenum hydrogenation series zinc oxide is generally used as the desulfurizer to convert the organic sulfur in the natural gas into inorganic sulfur and then remove it. The flow of raw natural gas treated here is large, so the natural gas source with high pressure can be used or a large margin can be considered when selecting the natural gas compressor.

The second step is the steam conversion of natural gas. Nickel catalyst is used in the reformer to convert alkanes in natural gas into feed gas with main components of carbon monoxide and hydrogen.

Then, carbon monoxide is converted to react with water vapor in the presence of catalyst to generate hydrogen and carbon dioxide to obtain the conversion gas whose main components are hydrogen and carbon dioxide. According to the different conversion temperature, the conversion process of carbon monoxide can be divided into two types: medium temperature conversion and high temperature conversion. The high temperature conversion temperature is about 360 ℃, and the medium temperature conversion process is about 320 ℃.With the development of technical countermeasures, the two-stage process setting of carbon monoxide high-temperature conversion and low-temperature conversion has been adopted in recent years, which can further save the consumption of resources. However, for the case that the carbon monoxide content in the conversion gas is not high, only medium temperature conversion can be adopted.

The last step is to purify hydrogen. Now the most commonly used hydrogen purification system is PAS system, also known as PSA purification and separation system. This system has low energy consumption, simple process and high purity of hydrogen production. At the highest, the purity of hydrogen can reach 99.99%.

Main process equipment