The Proportion of Different Heat in Reboiler Energy with the Optimal Process Parameters

“From the results above, the optimal process parameters and the lowest reboiler energy for different solvents can be obtained, which are listed in Table 2. The concentration of each solvent is selected in Section 3.1, the CO₂ partial pressure of flue gas is selected as 10 kPa and the pressure of the desorption tower is 2.2 bar. The highest configurable concentration of PZ considered in this work, 10 wt.%, was selected as the concentration of the PZ solvent, and the reason for this has been provided in Section 3.1. Due to the low concentration of PZ, L/G is 6.167, which is too large, and the reboiler energy consumption is very high, so PZ is not suitable for use as an absorbent alone. The L/G of other solvents is between 1.3 and 2.7, which is a reasonable range.

Table 2. The lowest reboiler energy and process parameters of different solvents.

Absorbent	$w t . %$	$α_{l e a n}$ mol/mol	$α_{r i c h}$ mol/mol	L/G kg/kg	$T_{r e b}$ °C	$Q_{r e b}$	$- Q_{c o n}$	$Q_{a b s}$	$Q_{T}$
Absorbent	$w t . %$	$α_{l e a n}$ mol/mol	$α_{r i c h}$ mol/mol	L/G kg/kg	$T_{r e b}$ °C	GJ/ton $C O_{2}$
MEA	40	0.22	0.511	1.742	125.4	3.415	0.669	2.347	0.401
PZ	10	0.20	0.846	6.167	123.3	4.657	2.008	1.604	1.05
1-MPZ	40	0.05	0.565	1.641	124.5	3.136	0.662	2.084	0.392
DMEA	30	0.01	0.349	2.738	122.4	3.207	1.317	1.222	0.669
AMP	40	0.01	0.520	1.361	125.3	3.168	0.67	2.184	0.315
HEPZ	30	0.02	0.538	2.641	123.7	3.018	0.854	1.544	0.686

Figure 9 shows the lowest reboiler energy consumption of different solvents and the contribution of the three types of heat for different solvents at the optimal concentration. The highest reboiler energy consumption is PZ, because L/G is relatively high, so the energy consumption for condensing and heating the liquid is also relatively high. The reboiler energy consumption of the MEA solvent is the second highest.

Q_{c o n}

and

Q_{T}

contribute less. The desorption heat,

Q_{a b s}

, contributes the most, and its value is higher than other solvent desorption heats. HEPZ has the lowest reboiler energy consumption, 3.018 GJ/tCO₂, which is about 35.2% lower than

Q_{r e b}

of PZ and 11.6% lower than

Q_{r e b}

of MEA, and

Q_{a b s}

is almost the lowest among all solvents, only slightly higher than

Q_{a b s}

of DMEA. The reboiler energy consumption of 1-MPZ, DMEA and AMP is close. The three heat values and their proportions of 1-MPZ and AMP are close.

Figure 9. The proportion of different heat in the reboiler energy of different solvents.

“

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The Proportion of Different Heat in Reboiler Energy with the Optimal Process Parameters

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