Syngas from coal gasification

Table 6.1 Types of Syngas From Coal Gasification Technologies...

Figure 5.28 Single-stage (a) and double-stage (b) CLC fed with syngas from coal gasification. fSource Reproduced from Ref [85], with permission from Elsevier)...

Table 5.3 List of main assumptions and performance of CLC used with syngas from coal gasification plant from Ref [86],... 

The integration of CLC with fossil fuel power plant has also been investigated by Spal-lina [91] using dynamically operated PBRs operated with syngas from coal gasification. 

Figure 5.34 (JSC schematic plant fed with syngas from coal gasification integrated with atmospheric PBRs presented in Ref [91 ]. fSource Reproduced from Ref [911, with permission from...

The research on CLC integration in fossil fuel power plants has been addressed to the use of combined cycle both from natural gas and syngas from coal gasification. Power plants with direct solid conversion have been recently proposed. Summarizing, the following potentialities can be highlighted for CLC technologies ... 

C -Chemisty. A great deal of research has been undertaken on the development of PGM catalysts for the manufacture of chemicals and fuels from syngas, a mixture of CO and H2 obtained from coal gasification (see Coal conversion processes). 

Synthetic Natural Gas. Another potentially very large appHcation of coal gasification is the production of synthetic natural gas (SNG). The syngas produced from coal gasification is shifted to produce a H2-to-CO ratio of approximately 3 to 1. The carbon dioxide produced during shifting is removed, and CO and H2 react to produce methane (CH, or SNG, and water in a methanation reactor. 

An advantage of this technology is that carbon dioxide can be separated easily from the syngas and captured rather than released into the atmosphere. If carbon dioxide can be successfully sequestered, hydrogen can be produced from coal gasification with near-zero greenhouse gas emissions. 

The preparation of syngas from natural gas (reforming), as well as from coal (gasification), is more fully discussed in Reference 7 (chapter 4). 

Syngas produced from coal gasification yields a raw gas that is very carbon rich and therefore substoichiometric (R < 1.0). By shifting some of the CO to H2 and subsequently removing excess C02, a balanced or stoichiometric gas (i 1.0) can easily be achieved. 

Whereas near-term appHcation of coal gasification is expected to be in the production of electricity through combined cycle power generation systems, longer term appHcations show considerable potential for producing chemicals from coal using syngas chemistry (45). Products could include ammonia, methanol, synthetic natural gas, and conventional transportation fuels. 

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