What are the basic requirements for gas in IGCC power generation?

The requirements are not strict; the operating conditions in a gasification furnace are very harsh, and it is generally possible to adapt to them. Of course, it is advantageous to have lower ash content and a higher ash melting point.

It discusses the requirements of gas turbines in the IGCC power generation process regarding gas pressure, as well as sulfur, arsenic, and dust content

In IGCC systems, gas purification processes are essential. Typically, in gas, in addition to CO, H2, CH4, CO2, and other gaseous hydrocarbons such as CnHm, there are also impurities such as H2S, COS, dust, halides, NH3, alkali metals, and tar vapor. These impurities cause corrosion and wear damage to gas turbines and other subsequent systems. To ensure the proper operation of IGCC units and achieve high reliability, it is necessary to purify the gas before it enters the gas turbines. Unlike conventional coal-fired power plants that purify flue gas, IGCC systems deal with pressurized gas at lower flow rates; as a result, the difficulty and energy consumption associated with purification are lower, and the purification efficiency is higher. This constitutes the advantage of IGCC in terms of gas purification. The operating temperature of the dust removal system is generally around 250°C to 370°C, and dry filtration can be used for dust removal in order to enable the recycling of fly ash. Interfaces are also reserved for a water washing and dust removal device, with the aim of removing residual particles, halides, NH3, and other impurities from the raw gas. In principle, the normal-temperature desulfurization method is adopted; it is recommended to follow the MDEA desulfurization process, with the desulfurization operation temperature ranging from 38°C to 40°C. And try to use a COS hydrolyzer, as this allows for an easy achievement of a desulfurization efficiency of over 98%.