# Process of Formaldehyde and Volatile Organic Compounds' Removal from Waste Gases
## 5 Co-Incineration of Waste Industrial Gases
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Stream Name** & **Units** & **3** & **4** & **5** & **10** & **11** & **OFF-GAS** & **AIR-IN** & **NAT-GAS** \\ \hline
**Phase** & & **VP** & **VP** & **VP** & **VP** & **VP** & **VP** & **VP** \\ \hline Temperature & C & 504.91 & 1270 & 607.882 & 135 & 328.048 & 27 & 20 & 20 \\ Pressure & bar & 20 & 20 & 1.05 & 1.05 & 0.05 & 1.28 & 1 & 20 \\ Mass Vapor & & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 \\ Fraction & & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ Mass Liquid & & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ Fraction & & 35,772.3 & 36,349.8 & 36,349.8 & 36,349.8 & 6120 & 15,000 & 20,772.3 & 577.539 \\ Mass Flows & kg/hr & 270 & 1691.95 & 1691.95 & 1691.95 & 6120 & 270 & 0 & 0 \\ Water & kg/hr & 0 & 2215.27 & 2215.27 & 2215.27 & 0 & 0 & 0 & 0 \\ N\({}_{2}\) & kg/hr & 29,426.1 & 29,426.1 & 29,426.1 & 0 & 13,492 & 15,934.1 & 0 \\ Methanol & kg/hr & 15.5 & \(6.21\times 10^{-18}\) & \(6.21\times 10^{-18}\) & \(6.21\times 10^{-18}\) & 0 & 15.5 & 0 & 0 \\ Dimirely & kg/hr & 82 & \(1.42\times 10^{-40}\) & \(1.42\times 10^{-40}\) & \(1.42\times 10^{-40}\) & 0 & 82 & 0 & 0 \\ CO & kg/hr & 221 & 0.010948 & 0.010948 & 0.010948 & 0 & 221 & 0 & 0 \\ O\({}_{2}\) & kg/hr & 5754.22 & 3016.54 & 3016.54 & 3016.54 & 0 & 916 & 4838.22 & 0 \\ Formald & kg/hr & 3.5 & \(3.42\times 10^{-9}\) & \(3.42\times 10^{-9}\) & \(3.42\times 10^{-9}\) & 0 & 3.5 & 0 & 0 \\ Methylen & kg/hr & 0 & \(8.00\times 10^{-14}\) & \(8.00\times 10^{-14}\) & \(8.00\times 10^{-14}\) & 0 & 0 & 0 & 0 \\ Methane & kg/hr & 0 & \(6.748.00\times 10^{-12}\) & \(6.74\times 10^{-12}\) & \(6.74\times 10^{-12}\) & 0 & 0 & 0 & 577.539 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Results of computer simulation of co-incineration of waste industrial gases from metal oxide catalyst formaldehyde production processes in combined-cycle gas turbines (CCGT). The theoretical net power of a combined-cycle gas turbine, presented in Figure 6, is 4333 kW. According to the (LHV) used natural gas, the efficiency is 43.3% at the natural gas consumption of 716.2 kg/h. By comparing the results of the computer simulation shown in Table 5, it is evident that the co-incineration of waste gases from the existing formaldehyde production processes (Figure 5) with combined cycle gas turbines (Figure 6) consumed up to 20% less natural gas. A gas turbine requires a large amount of air for its operations. When mixing air with the off-gases produced by the metal oxide catalyst formaldehyde production processes, the concentration of off-gas/air mixture is very low. Increasing the off-gas/air mixture concentration would reduce the wasteful amount of natural gas at the co-incineration of waste industrial gases with a combined-cycle gas turbine, but further research is required to avoid an explosion in the gas turbine compressor. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Stream Name** & **Units** & **3** & **4** & **5** & **10** & **11** & **AIR-IN** & **NAT-GAS** \\ \hline
**Phase** & & **VP** & **VP** & **VP** & **VP** & **VP** & **VP** & **VP** \\ \hline Temperature & C & 499.72 & 1270 & 607.52 & 135 & 328.048 & 20 & 20 \\ Pressure & bar & 20 & 20 & 1.05 & 1.05 & 0.05 & 1 & 20 \\ Mass Vapor & & 1 & 1 & 1 & 1 & 1 & 1 & 1 \\ Fraction & & 0 & 0 & 0 & 0 & 0 & 0 \\ Mass Flows & kg/hr & 35,936.1 & 36,652.2 & 36,652.2 & 36,652.2 & 6120 & 35,936.1 & 716.149 \\ Water & kg/hr & 0 & 1608.4 & 1608.4 & 1608.4 & 6120 & 0 & 0 \\ CO\({}_{2}\) & kg/hr & 0 & 1964.6 & 1964.6 & 1964.6 & 0 & 0 & 0 \\ N\({}_{2}\) & kg/hr & 27,565.9 & 27,565.9 & 27,565.9 & 0 & 27,565.9 & 0 \\ O\({}_{2}\) & kg/hr & 8370.12 & 5513.27 & 5513.27 & 5513.27 & 0 & 8370.12 & 0 \\ Methane & kg/hr & 0 & \(5.95\times 10^{-18}\) & \(5.95\times 10^{-18}\) & \(5.95\times 10^{-18}\) & 0 & 0 & 716.149 \\ \hline \end{tabular}
\end{table} 
Table 5: Results of computer simulation of the combined-cycle gas turbines. Figure 6: Computer simulation of the combined-cycle gas turbine.