An Integrated Gasifier Combined Cycle (IGCC) that uses a gasifier to turn coal and other carbon based fuels into gas-synthesis gas (syngas).
Then remove impurities from the syngas before it’s combusted. The pollutants, sulfur will be turned into re-usable.
This leads to lower emissions of sulfur dioxide, particulates and mercury.
With additional method equipment, the carbon within the syngas will be shifted to hydrogen through the water-gas shift reaction, leading to nearly carbon free fuel.
The resulting carbon dioxide from the shift reaction can be compressed and stored.
Excess heat from the primary combustion and syngas fired generation is then passed to a steam cycle. It almost like combined cycle gas turbine.
This improved result in efficiency/potency is compared to conventional pulverised coal.
The water-gas shift reaction (WGSR) describes the reaction of CO and water vapor to make carbon dioxide and H2
CO + H2O → CO2 + H2
Raw-gas cooling through water quench or heat recovery systems.
Optional water-gas shift reactor. Gas purification system with sulphur removal/recovery and optional CO2 removal. Air separation unit,Combined cycle unit with gas turbo set, heat recovery steam generator and steam turbo set.
The gasifier feedstock is converted to synthesis gas (syngas) with the addition of steam and oxygen.
Entrained-flow gasifiers for coal are basically well suited to integration within the combined cycle.
The selection of a selected gasifier type to attain the simplest price, potency and emissions levels depends on the kind of fuel and therefore the specifc application, and should be investigated.
The present Siemens Fuel Gasification (SFG) technology applies the entrained flow principle, followed by instantaneous water quench to cool-down the produced hot raw gas.
This technique usually employed in residue gasification additionally appropriate for a variety of fuels, in particular coal and petroleum coke.
It is possible to capture the sensible heat of the hot raw gas in a syngas cooler to generate high pressure steam for the steam turbine.
Both processes cool the gas in order that it will be sent to the gas treatment system.
In oxygen-blown gasification, the air separation unit (ASU) generates the enriched oxygen supply required for the gasification method.
The inevitably coproduced nitrogen from the ASU is employed primarily within the gas turbine cycle and within the case of coal or petroleum coke, smaller amounts are used to transport the solid fuels to the gasifier and for inverting purposes.
In addition to air for combustion, the compressor of the gas turbine-generator might also provide all or part of the air for the ASU.
The steam turbine is supplied with steam from the gas turbine heat recovery steam generator (HRSG).
The heat from the raw gas is used to generate steam for the turbine once gasifiers with high gas outlet temperatures are implemented.
The combined cycle power plant is additionally well suited to control/operate on syngas from other non-Siemens gasification processes.
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