Development of advanced air-blown entrained-flow two-stage bituminous coal IGCC gasifier

Nikolay A Abaimov,Alexander F Ryzhkov

doi:10.1051/epjconf/201715900001

Abstract

Integrated gasification combined cycle (IGCC) technology has two main advantages: high efficiency, and low levels of harmful emissions. Key element of IGCC is gasifier, which converts solid fuel into a combustible synthesis gas. One of the most promising gasifiers is air-blown entrained-flow two-stage bituminous coal gasifier developed by Mitsubishi Heavy Industries (MHI). The most obvious way to develop advanced gasifier is improvement of commercial-scale 1700 t/d MHI gasifier using the computational fluid dynamics (CFD) method. Modernization of commercial-scale 1700 t/d MHI gasifier is made by changing the regime parameters in order to improve its cold gas efficiency (CGE) and environmental performance, namely H2 /CO ratio. The first change is supply of high temperature (900°C) steam in gasifier second stage. And the second change is additional heating of blast air to 900°C.

Highlights

Coal is the most widespread kind of fossil fuel in the world
One of the most promising gasifiers is airblown entrained-flow two-stage bituminous coal gasifier developed by Mitsubishi Heavy Industries (MHI)
Modernization of commercial-scale 1700 t/d MHI gasifier is made by changing the regime parameters in order to improve its cold gas efficiency (CGE) and environmental performance, namely H2/CO ratio

Summary

Introduction

Issues of highly efficient and environmentally friendly usage of coal fuel will be relevant of at least several hundred years. The large capacity (over 250 MW) IGCC structure includes entrained-flow type gasifier, because of their high unit performance. The IGCC efficiency depends largely on the gasifier operation parameters. The paper aim is development of advanced air-blown entrained-flow two-stage bituminous coal IGCC gasifier. To achieve the aim it is necessary to accomplish the following tasks: 1) examine the gasifiers development international experience and choose the original design of commercially successful gasifier, based on which advanced gasifier will be developed; 2) create and verify the model to investigate the features of entrained-flow gasifiers and develop new designs; 3) modify the original gasifier to increase its efficiency and improve environmental performance using the verified model

MHI gasification technologies

Possibility of a steam supply

Model verification

Gasifier development

Conclusion