A game changer in the energy industry.

Synthesis gas from coal as a source of hydrogen,

electricity production and expensive chemicals!

Author: Vlastimil Vilímek | Prague on 03.02.2024

Decoupling Gasification is a promising option for clean coal utilization, offering a number of advantages including full and efficient coal utilization, high thermal efficiency, excellent quality of hydrogen-rich synthesis gas, wide product range, versatility in using different coal types and efficient management.

Hydrogen-rich synthesis gas offers a wide range of applications, from power generation, to fuels, to high value-added chemicals.

 

Methods for its production are currently being intensively investigated, with conventional coal gasification being one of the most widely used.

 

Many studies have been carried out to produce hydrogen synthesis gas in this way.

 

Various factors such as temperature, pressure, type of coal or gasifier and the presence of catalysts have been analysed and their effect on the overall hydrogen yield.

 

From these studies it can be concluded that all the parameters investigated have a positive impact on hydrogen production under optimal operating conditions.

 

It was also confirmed that the presence of catalysts significantly increases the hydrogen content of the production gas.

 

Some studies have also taken an innovative approach by investigating the possibility of combining biomass and coal gasification to produce hydrogen synthesis gas.

 

Other research shows that the percentage of hydrogen produced by solid bed gasification can be as high as 67%, with CO and CO2 yields ranging from 2-23.9% and 4.41-33.7% respectively.

 

The conventional coal gasification technique is mature and widely used for the production of hydrogen synthesis gas and other high value-added products.

 

Current developments are moving towards greater efficiency, lower production costs and reduced environmental impact.

 

At the same time, opportunities are being sought to use a wider range of coal types.

 

The main challenges include increasing efficiency, upgrading large gasifiers, controlling and treating pollutants, and using solid residues after gasification.

 

Studies also show that oxygen carriers such as Fe 2 O 3 , hematite and mixed oxygen carriers are key to the efficient conversion of coal to synthesis gas.

 

A number of investigations have also been carried out focusing on exogenous metals as potential oxygen carrier enhancements.

 

The development of new composite oxygen carriers is currently underway.

 

Studies are also investigating the reaction temperature and optimization of synthesis gas production. For example, the oxygen carrier PG – CuFe 2 O 4 has shown excellent abilities to trap H2S and achieve the optimum reaction temperature for the production of high quality synthesis gas.

 

It is also important to mention that different types of coal can be used as feedstock in the gasification process and gasifiers can be divided into three main categories – solid, fluidized bed and entrained bed.

 

 

In a series of follow-up articles, we have covered in detail Supercritical Water Gasification (SCWG), Plasma Gasification ( which produces a gas that has carbon monoxide, hydrogen, methane and other gases in an oxidizing plasma environment), CLG ( a new way to convert coal into a synthetic gas with high hydrogen content), Decoupling Gasification– (an advanced coal gasification process that produces products that can then be used in a variety of applications, including the production of fuel oils, high value-added chemical products from tar, or clean fuels, hydrogen and electricity from pyrolysis gas). We introduced the main innovative coal gasification techniques that are attracting increasing interest and discussed in detail the results of a comprehensive study funded by the Chinese Academy of Sciences, the Basic Science Center Program for Orderly Energy Conversion of the National Natural Science Foundation of China, and the National Natural Science Foundation of China.

 

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If you are interested in reading the full detailed study, we will be happy to send you the original English version upon request in PDF format. Simply email us at our website https://theory72.com with the request “send us the full study “Coal Gasification”.

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