Carbon dioxide removal in indirect gasification - SGC

Table of Content
SGC Rapport 2013:277
1 Introduction .................................................................................................. 12
1.1 Aim .......................................................................................................... 12
1.2 Report structure....................................................................................... 12
2 Production of SNG ....................................................................................... 13
2.1 H2/CO-ratio.............................................................................................. 14
2.2 Reactor Designs...................................................................................... 14
2.2.1 Recycle Gas Processes.................................................................... 14
2.2.2 TWR – Throughwall Cooled Reactor ................................................ 15
2.2.3 Fluidized-bed reactor ........................................................................ 16
2.3 Gas quality .............................................................................................. 16
3 Gasification, gas cleaning and gas conditioning .......................................... 18
3.1 Gasification technologies ........................................................................ 20
3.1.1 Fixed Bed Gasification...................................................................... 20
3.1.2 Fluidized Bed Gasification ................................................................ 21
3.1.3 Entrained Flow Gasification .............................................................. 23
3.1.4 Indirect gasification........................................................................... 23
3.2 Gas impurities and cleaning techniques.................................................. 25
3.2.1 Particles............................................................................................ 25
3.2.2 Tar .................................................................................................... 25
3.2.3 Sulphur ............................................................................................. 27
3.2.4 Ammonia........................................................................................... 27
3.3 Gas conditioning...................................................................................... 27
3.4 Process configurations............................................................................ 28
4 CO2-capture technologies............................................................................ 31
4.1 Physical absorption ................................................................................. 31
4.1.1 Methanol (Rectisol process) ............................................................. 31
4.1.2 N-methyl-2-pyrrolidone (Purisol) ....................................................... 31
4.1.3 Dimethylether of polyethylene glycol (Selexol process).................... 32
4.1.4 Water scrubbing................................................................................ 32
4.2 Chemical absorption................................................................................ 33
4.2.1 Monoethanolamine (MEA) ................................................................ 33
4.2.2 Piperazine activated N-methyldiethanolamine (MDEA/PZ)............... 34
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