527 Q2 Ch2 Comp&Trans

CO2 transportation is a key step in the successful realization of CCU.

• True.

• False.

The most common method for transporting large volumes of CO2 over long distances is

• pipelines

• ships

• railways

• trucks.

CO2 is transported in pipelines as

• compressed supercritical fluid.

• compressed gas.

• compressed two-phase (liquid+gas) fluid.

When compressing a high flow rate of CO2, we should use

• multi-stage compression with intercooling.

• single-stage compression with aftercooling.

• multi-stage compression with no cooling.

• single-stage compression with no cooling.

If CO2 is to be compressed from 1 bar to 64 bar using a 3-stage compression system, the compression ratios of the individual stages should be

• 4, 4, 4

• 2, 4, 8

• 2, 2, 16

• arbitrary (i.e., all options are fine)

Consider a 2-stage CO2 compression system. Which of these options consumes lower overall power?

• Compressor, followed by a small cooling unit, followed by a second compressor

• Compressor, followed by a large cooling unit, followed by a pump

The supersonic shock-wave compression technology enjoys both higher efficiency and greater compression ratios than the conventional compression technologies.

• True.

• False.

Which of these parameters is the primary design constraint when considering CO2 pipeline transport?

• Line diameter

• Pressure drop

• Elevation change

• CO2 mass flow rate

• CO2 compressibility

The longer a CO2 pipeline is, the larger its diameter needs to be.

• True.

• False.

Precombustion CC involves fuel reforming, where a hydrocarbon fuel is reformed into syngas (CO2 + H2). CO2 is separated, and H2 is used as clean carbon-free fuel.

If any H2 escapes with the captured CO2, which of the following problems will occur?

(check all that applies)

• Compression power of CO2 increases.

• Metallic pipelines will suffer from embrittlement.

• H2 will react with CO2 during compression, causing harmful chemicals.

• No problems at all; H2 is benign (لا يسبب أي مشاكل)