Cornell 20000Nm3/H Coal Hydrogen Production Pressure Swing Adsorption Technology

Cornell 20000Nm3/H Coal Hydrogen Production Pressure Swing Adsorption Technology

Cornell 20000Nm³/H Coal Hydrogen Production

Technology Application:

Techairs is a domestic company with the most outstanding performance in intermittent production of hydrogen from coal (with wide source of raw material, such as powdered coal, lump coal, anthracite, lignite, industrial coke oven gas and crude gas etc.), and the technology has reached the world advanced level. The coal to gas PSA is successfully adopted for the hydrogen production as well as the crude gas PSA and the coke oven gas purified PSA.

Process description

There are two main methods to produce hydrogen from coal: one is coal coking (or high temperature retorting), the other is coal gasification. Coking refers to the preparation of coke from coal at 900-1000 ℃ under the condition of isolated air, and the by-product is coke oven gas. Coke oven gas contains 55% - 60% hydrogen, 23% - 27% methane and 6% - 8% carbon monoxide. Each ton of coal can produce 300 ~ 350m3 of gas, which can be used as city gas and raw material for hydrogen production. Coal gasification means that coal reacts with gasifying agent to form gas products under high temperature and pressure. The gasifying agent is water vapor or oxygen (air), and the gas product contains hydrogen and other components, whose content varies with different gasification methods. The purpose of gasification is to produce chemical raw materials or city gas. Large scale industrial coal gasifier, such as Lurgi Gasifier, is a fixed bed gasifier. The gas composition is 37% ~ 39% (volume fraction) of hydrogen, 17% ~ 18% of carbon monoxide, 32% of carbon dioxide and 8% ~ 10% of methane. China has a large Lurgi furnace, and the gas production of each furnace can reach 10000 m3 / h. Entrained bed gasifier, such as Texaco gasifier, uses coal water slurry as raw material. At present, industrial production units have been built to produce feed gas for ammonia synthesis and methanol synthesis. The gas composition is 35% ~ 36% (volume fraction) of hydrogen, 44% ~ 51% of carbon monoxide, 13% ~ 18% of carbon dioxide and 0.1% of methane. It is characterized by low methane content. At present, a large number of small and Medium-sized Ammonia Plants in China use coal as raw material and adopt fixed bed gasifier, which can produce water rich gas or water gas intermittently. After gasification, hydrogen gas is produced as raw material for ammonia synthesis, which is a method of obtaining hydrogen source with Chinese characteristics. The gas products are mainly composed of hydrogen and carbon monoxide.

Technical indexes:

Purity: 99%~99.9999%

Capacity: ≥2000Nm³/h

Yield :≥80%

Features and advantages:

Mature process technology and safe and reliable operation.

Wide source of raw material and large processing scale.

Four stages of full low conversion process with the CO conversion rate >95%.

Advanced recovery technology of thermal energy and low consumption of production energy.

The "three wastes" boiler is adopted, being environmentally friendly.

Reference