Biogas has the potential to be a significant renewable energy source that can be used globally. Biogas is primarily composed of methane $(C{H}_4)$ and carbon dioxide $(C{O}_2),$ with trace amounts of hydrogen sulphide $(H_2(S)),$ ammonia $(N{H}_3),$ nitrogen $(N_2),$ and hydrogen $(H_2).$ The significant quantity of non$-$combustible carbon dioxide $(C{O}_2)$ gas in biogas not only decreases its heat$-$producing capacity, but also lowers the speed at which flames propagate and narrows the range of concentrations at which it can ignite. Furthermore, when biogas is utilised as a fuel for transportation vehicles, the storage cylinder tanks experience an increase in the volume occupied by $CO2$ gas. This leads to higher energy consumption for compressing the biogas and consequently results in an indirect rise in operational expenses. Hence, the removal of $CO2$ from Biogas is vital. Gas absorber or scrubber is installed next to Biogas tank. The biogas is entering the Scrubbers at rate of $1500k\frac{g}{h}$ and in contact with a solvent to capture $95\%$ of $C{O}_2.$ The Biogas composition data for the inlet absorption process to carry out the design calculations are given in Table $1.$

Table $1$ The inlet composition of Biogas to the absorption process

$\backslash$table$[[$Biogas$,$Mol $\%],[C{H}_4,65],[C{O}_2,32\mathrm{.}59],[H_{2}S,2],[N{H}_3,0\mathrm{.}4],[N_2,0\mathrm{.}01]]$

As team of engineers, you are required to write a technical report that propose the best absorption tower, by designing two different gas absorption type $($tray and packed tower$)$ for $C{O}_2$ removal, complete with justification for all of selection and assumptions $($supported with references$).$

$5\mathrm{.}0$ CONTENT OF REPORT

Introduction: should include background on both Packed and Tray Tower, including solvent

selection.to remove $C{O}_2(15$ Marks$)$

Block Diagram or PFD: Gas absorption complete with streams number, composition, and operating conditions. Use AutoCAD for detail design including dimensions $(15$ Marks$)$

Mass Balance: Complete calculation with component balance and overall balance and by showing in and out of system in balanced. Please ensure the unit is also provided in mass Unit $(10$ Marks$)$

Detail Design Calculation for packed and tray tower by using excel $(40$ Marks$)$

Comparison of both absorptions and Selection of suitable Gas absorption Tower: Summarize the absorber design in table form & conclude the best design for $C{O}_2$ removal. Complete with justification $($feasibility$,$ economically and efficiency$)(15$ Marks$)$

Conclusion: Conclude the whole report $(5$ marks$)$