In this issue, the editor will explain the applications of Chengdu hydrogen production equipment in the chlor alkali industry. Let's take a look together.
In the production of polyvinyl chloride in the chlor alkali industry, for the production of vinyl chloride, it is necessary to control the absence of free chlorine in hydrogen chloride. Therefore, in hydrogen chloride production, the ratio of chlorine gas to hydrogen gas is usually controlled to be 1: (1.05-1.00). The chlorine and hydrogen produced by electrolyzing sodium chloride solution are equimolar, therefore, PVC production enterprises face the problem of excessive chlorine and insufficient hydrogen. Usually, in order to balance chlorine gas, some liquid chlorine or other chlorine consuming products will be produced as a byproduct.
1. Selection of hydrogen production process technology solutions. Currently, there are many industrial hydrogen production methods, mainly including the following 5 categories.
(1) Fossil fuel hydrogen production: including natural gas hydrogen production, coal hydrogen production, etc.
(2) Hydrogen production from hydrogen rich gas: including hydrogen production from tail gas of synthetic ammonia production, hydrogen production from hydrogen rich gas recovery in refineries, hydrogen production from by-product recovery in chlor alkali plants, and hydrogen recovery and utilization from coke oven gas.
(3) Methanol hydrogen production: including methanol decomposition hydrogen production, methanol steam reforming hydrogen production, methanol partial oxidation hydrogen production, and methanol conversion hydrogen production.
(4) Hydrolysis hydrogen production: including electrolysis of water, alkaline electrolysis, polymer electrolyte thin film electrolysis, high-temperature electrolysis, photodegradation, biophotolysis, and thermochemical hydrolysis.
(5) Biomass hydrogen production: Biomass hydrogen production methods generally include biomass gasification hydrogen production and microbial hydrogen production.

1.1 Comparison of Industrial Hydrogen Production Process Technology Plans
(1) The process of hydrogen production from coal is more complex than that from natural gas, and the cost of obtaining hydrogen is also higher.
(2) Due to the high impurity content and low purity of hydrogen produced by methods such as biological hydrogen production, biomass hydrogen production, and hydrogen rich gas hydrogen production, it cannot meet the hydrogen purity requirements of users.
(3) Natural gas steam reforming for hydrogen production occupies a prominent position in large-scale hydrogen production, with advantages such as mature process, reliable device operation, strong economy, environmental protection, and reasonable resource utilization. It has incomparable advantages in adapting to large-scale production, but faces problems such as large investment in industrial equipment and catalyst deactivation due to easy carbon deposition.
In the long run, natural gas prices are on the rise, and operating costs will gradually increase in the future. There is no advantage in operating costs compared to methanol hydrogen production in the future.
(4) Small scale hydrogen production and high-purity hydrogen can be achieved through electrolysis of water, with the following characteristics.
The scale of hydrogen production by water electrolysis is generally less than 200 m3/h, which is a relatively mature hydrogen production method. Due to high electricity consumption, reaching 5-8 kW · h/m ³, the unit hydrogen cost is relatively high. Except for regions with low electricity prices, the high electricity prices make water electrolysis hydrogen production uneconomical. Therefore, for many years, water electrolysis hydrogen production technology has not made much progress since its development.
(5) Methanol steam reforming for hydrogen production is a small and medium-sized hydrogen production enterprise, with the following characteristics.
① Compared with large-scale natural gas hydrogen production or water electrolysis hydrogen production, methanol steam reforming has lower investment and energy consumption. Due to the low reaction temperature (260-280 ℃), mild process conditions, and low fuel consumption. Compared with natural gas hydrogen production units of the same scale, the energy consumption of methanol steam conversion for hydrogen production is about 50% of the former.
② The raw material methanol used for hydrogen production through methanol steam reforming is readily available and convenient for transportation and storage. Moreover, due to the high purity of the raw material methanol used, there is no need for further purification treatment, the reaction conditions are mild, the process is simple, and therefore easy to operate.
That's all for the sharing about the hydrogen production plant in Chengdu. Are you satisfied with the editor's answer? If there is anything you need to add or want to know, please feel free to leave a message for me.