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\title{Performance of a Capstone Gas Turbine based Power Plant Working on High Butane LPG}
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             \author[1]{Carlos  Romero}

             \author[2]{Yamid  Carranza}

             \author[3]{Ricardo  Acosta}

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\date{\small \em Received: 9 August 2021 Accepted: 3 September 2021 Published: 18 September 2021}

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\begin{abstract}
        


In this paper there are presented the results of the operational performance of a 30 kW microturbine generator (MTGs) fed with high butane content liquefied petroleum gas, while subjected to a stand-alone test procedure involving steady and transient load conditions. Neither modifications, nor regulations were made to the micro-turbine system for operation on the liquefied petroleum gas. To evaluate the performance, measurements of turbine and generator parameters were gathered from its original unit controller, as load changes were applied by changing load-bank values. For the stand-alone mode detailed graphs of the test results are presented, showing the transparency and robustness of the turbine-generator set to the used fuel, judging by the quality of the output electric parameters. The results from this performance testing provide good insight into the use of high-butane content liquefied petroleum gas as fuel for the tested microturbine. The continuous use of a fuel would need more tests to establish that the life of the critical components of the microturbine are not hampered from what they are on the baseline fuel.

\end{abstract}


\keywords{gas turbine, high butane LPG, electrical generator, performance, power generation.}

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\let\tabcellsep& 	 	 		 
\section[{I. Introducción}]{I. Introducción}\par
he need to respond in a safe, efficient and environmentally sustainable manner to the growing energy needs in the different sectors of the national economy, demands the rationalization, technical improvement and expansion of the sources of electricity supply. Responding to this demand, the Colombian Ministry of Mines and Energy, the Unit for the Mining-Energetic Planning (UPME), and the Energy and Gas Regulation Commission (CREG) lead a comprehensive policy that promotes, generates and stimulates programs and projects for the generation, saving and efficient use of energy and particularly for self-generation \hyperref[b0]{[1]} [2] \hyperref[b3]{[4]}\hyperref[b4]{[5]}\hyperref[b5]{[6]}\hyperref[b6]{[7]}\hyperref[b7]{[8]}\hyperref[b8]{[9]}.\par
The Colombian Government issued Decree 2143 of 2015 \hyperref[b8]{[9]}, through which tax incentives are regulated for the promotion, development and efficient use of energy. The micro-grids find their way, with sources of distributed generation, local storage, controlled loads, and the possibility of developing electrical islands. Colombia is promoting programs for distributed generation (DG) and will probably encourage more projects for self-generation in the commercial, residential and service sectors, emulating initiatives as that of the US Department of Energy, which promoted the Advanced Alternative Engine Systems program (ARES), designed to develop small micro-generators units of high efficiency \hyperref[b11]{[12]}. If incentives are created for self-generation in commercial, residential and service sectors, the incorporation into the system of microgeneration units could be attractive, and the introduction of microturbine generators could be favored.\par
On the other hand, Colombia is currently exporting LPG, a part of which is obtained as a byproduct of natural gas purification in known fields as Cusiana. Some energy suppliers have had interest in exploring the performance behavior of power generators when they are run on high butane liquefied petroleum gas for electricity generation in oil fields. Considering the fact that to date, to the authors' knowledge, there has not been reported any experimental tests related to the performance of microturbine generator (MTG) sets fuelled with LPG from Cusiana, a 30 kW Capstone MTG fed with Cusiana LPG was tested, as a pilot experience, to judge about its power output, step response, power quality, and fuel consumption.\par
Microturbines are lightweight and compact in size combustion turbines with outputs of 30 kW to 400 kW that can be used for stationary energy generation applications at sites with space limitations for power production. They can be run on natural gas, biogas, propane, butane, diesel, and kerosene. Particularly, the Capstone MTG consists of a compressor, recuperator, combustor, turbine and permanent magnet generator; the air drawn through the inlet system refrigerates the generator, discarding the need of a liquid cooling system. Intake air is compressed and injected into the recuperator, a heat exchanger where it is heated by turbine exhaust. Fuel enters the system through an injection port and is mixed with the heated compressed air. The ignition system causes the air-fuel mixture to burn in the combustion chamber under constant pressure conditions; the resulting gases are allowed to expand through the turbine section to perform work, rotating the turbine blades to turn a generator, which produces electricity. The rotating components, which T Global Journal of Researches in Engineering (A ) Volume Xx XII Issue I V ersion I can reach 96,000 min -1 , are mounted on a single shaft supported by low-maintenance air bearings.\par
The MTG has been tested in stand-alone mode, as a power source that meets the current consumption demanded by the coupled load. The general goals of the load test were:\par
? To get onsite experimental information related to the performance of the Capstone microturbine when fueled with Cusiana LPG. ? To measure the electric generation performance of the MTG under a load cycle, for the given open ambient conditions, with the available instrumentation, and the time allowed to perform the test, adjusting as far as possible to the rules of operation and tests of the MTG.\par
? To provide an appropriate stable medium for the reliable evaluation of electrical efficiency, and MTG performance.\par
The work here presented refers to the evaluation study, and is organized as follows: first, the properties of the LPG used are related, and a brief description of the Capstone micro-turbine is given. After that, this paper describes the experimental procedure and constraints. Next, the test program is described, followed by a summary of the results. Finally, the main conclusions of the work are presented. 
\section[{II. Materials and Methods}]{II. Materials and Methods} 
\section[{a) Particularities of the LPG from Cusiana}]{a) Particularities of the LPG from Cusiana}\par
The term LPG applies widely to any mixture of propane and butane, the two constituents occurring naturally in oil and gas reservoirs that are gaseous at normal atmospheric conditions but can be liquefied by pressure alone. Components heavier than butane are liquids at normal conditions and components lighter than propane cannot be liquefied without refrigeration. The presence of butane, pentane, and heptane at concentrations of up to 40\% characterize this particular LPG from Cusiana, which analysis is presented in table \hyperref[tab_0]{1}. BTU?ft -3 @ 14,65psia, 60°F b) Capstone micro-turbine Microturbines have advantages over modern internal combustion engines, such as their high-power density, less moving parts and comparatively low emissions. They can be fuelled by liquid and gaseous fuels -fossil or renewable. Microturbine capacities are generally between 30 to 350 kW. The Capstone 330 MTG, made available by the company Supernova Energy Services, installed in Alsabana was subjected to service setting works, as it was new. Photographs in figure \hyperref[fig_0]{1} allow to illustrate the general view of the MTG located at the test site.  Since Capstone Microturbines use lean premix combustion system to achieve low emissions levels at a full power range, they require operating at high air-fuel ratio; injectors control the air-fuel ratio. The MTG is instrumented to record operational parameters (of which, temperatures, pressures, fuel usage, turbine speed, internal voltages/currents, and status are of importance for the undertaken study). The average readings of two thermocouples indicates the Turbine Exit Temperature (TET); a compressor inlet thermistor is installed to measure the air temperature at the inlet of the compressor wheel; the air flow, Wair, (in pounds per hour) and the amount of energy needed in the combustion chamber required to regulate fuel flow in the combustion chamber, W energy (in Btu/sec), are calculated based on engine speed. Such data are available with a computer or modem connected to an RS-232 port on the microturbine. A schematic drawing of the built-in instrumentation supported by the microturbine generator is presented in figure \hyperref[fig_1]{2}. A large on-board battery pack is used to start the microturbine, and also to store energy when the microturbine decelerates to produce less power. To meet output power requirements automatically, the system can be configured in Auto Load mode. Auto Load ensures that the microturbine closes the output contactor to immediately produce the required output power once minimum engine load speed is reached. The output speed-power characteristic of the microturbine generator is reproduced in figure  {\ref 3}. 
\section[{Figure 3: c) Experimental facility and procedures}]{Figure 3: c) Experimental facility and procedures}\par
LPG was supplied from an oil field to the test site by a tanker with a storage pressure ranged between 50 and 90 psia during the test; an intermediary damper tank was used to reduce pressure fluctuations due to consumption, and a bypass was used in the LPG supply line with its respective regulating valves before the entry of gaseous fuel to guarantee the pressure, as can be observed in the photographs of figure \hyperref[fig_2]{4}. The average ambient conditions at the time of the test were: temperature close to 14°C, 80,2\% relative humidity, and 0,726 atmospheric pressure.  The procedure followed to assess electrical, thermal, and operational performance of the microturbine generator, comprised pretest activities, startup, idle, and a two-step load test during a short period of time. The software for the microturbine unit was configured for standalone operation through the local display panel; the turbine was started, controlled and monitored by a computer using Capstone's software.\par
The load test applied by the load bank, as it is shown in figure \hyperref[fig_5]{6}, consisted of a transient from idling to a 20-kW load at maximum speed of 96000 min -1 , a steady-state operation in this operation point for about eight minutes, followed by a drop to 3 kW power at 60000 min -1 , and a steady running at this load for about four minutes. In the last part of the test, the load was completed released and the microturbine was sustained idling at a speed of 45000 min -1 , as it is shown in figure \hyperref[fig_5]{6}. During the test, all available parameters were monitored and recorded from the MTG system. All electrical parameters (both single-phase and threephase) were recorded at the load bank by the energy meter.  The study focused on the overall performance parameters related to engine operation. In the following, the results of the collected data during the operation cycle, and the response of the turbine-generator to load changes are presented. Initially, the results obtained from the proprietary MTG controller are presented: inlet to compressor and turbine exhaust gas temperatures, air flow, intake air temperature and pressure values. Once the behavior variables are described, the evolution graphs of the electrical power, voltage, and current delivered by the MTG are illustrated. The information thus presented allows to evaluate the behavior of the MTG operating with LPG, from the perspective of stable operating capacity and within the mechanical, thermal, environmental limits. 
\section[{Global Journal of Researches in Engineering}]{Global Journal of Researches in Engineering} 
\section[{a) Mean-variable measurement results}]{a) Mean-variable measurement results}\par
The microturbine generator has presented a normal behavior during the test, judging by the values of the speed, power, inlet to the turbine and compressor temperatures, load percentage, among the operating parameters registered by the proprietary controller of the microturbine; a summary of those performance parameters is presented in table  {\ref 3}. The general behavior of the MTG during the test, as a function of time, is presented in figure \hyperref[fig_6]{7}, where the history of output power, rotation speed, inlet to compressor and exit turbine temperatures, input amount of energy, and air flow is plotted. Analysis of the graphs shows that the Capstone microturbine responds to load changes rapidly, yet during steps up and down in the MTG real power output, turbine speed follows ramps up and down smoothly to the new operating point. When the load bank resistance is reduced, turbine shaft speed drops smoothly to its new operating point. 
\section[{Global Journal of Researches in Engineering}]{Global Journal of Researches in Engineering}\par
(A ) Volume Xx XII Issue I V ersion I Considering the heat value given by the chromatographic analysis of the LPG, the energy flows are converted to fuel flows, which allows to approximate also the air/fuel ratio. The variation of these magnitudes is shown in the figure \hyperref[fig_7]{8}.    
\section[{IV. Results of the Electrical Energy Generated}]{IV. Results of the Electrical Energy Generated}\par
The quality of the energy generated could be influenced by the quality of combustion process of the fuel. MTG with the Capstone microturbine meets the specifications demanded for class G1 generators, in terms of frequency and voltage deviations during transient processes. Observation of the voltage at the load banks during the test showed a small sensitivity to load level. There is little change in the balance of the three-phase voltages. There is no discernable pattern to the changes in the bus voltage; all three phases respond equally to the load changes. 
\section[{V. Conclusions}]{V. Conclusions}\par
Microturbine pilot test was carried out to determine performance characteristics, and to assess the possible inconveniences of using the particular highbutane-content LPG. To achieve the technical goals, it was considered a short test based on a two-step sequence of loads. The main conclusion drawn from the study is that, under the scope of this study, the output of the turbine generator was satisfactory, showing its adaptability to the change in fuel. The limited amount of testing done here restricts the applicability of these conclusions to the specific type of LPG used. Cold and warm starts performed well. The estimated efficiency of power generation appeared to be unchanged, as compared to the values indicated by the manufacturers.\par
It can be stated that, based on the short test carried out, gas turbines are an advantageous alternative to the use of reciprocating engines, due to their adaptability to the fuel, their low noise and vibration levels, their compact structure and their efficiency close to that of the diesel engine. The tests showed a higherthan-expected performance and it is about to find out with the supplier how close this value is, since in the literature itself a performance of more than 30\% is not expected, while the conducted test showed an efficiency close to 40\% for 66\% of the load. It is yet to be proven.\par
Gas turbines are an excellent alternative and their technology is very mature for generation and cogeneration standalone applications; in the commercial and industrial sectors, microgrid power parks, remote off-grid locations, presenting only the defect of greater starting time (close to 2 minutes, value obtained from the literature). Engine Speed [min  {\ref -1]} \begin{figure}[htbp]
\noindent\textbf{1}\includegraphics[]{image-2.png}
\caption{\label{fig_0}Figure 1 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2}\includegraphics[]{image-3.png}
\caption{\label{fig_1}Figure 2 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{4}\includegraphics[]{image-4.png}
\caption{\label{fig_2}Figure 4 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{5}\includegraphics[]{image-5.png}
\caption{\label{fig_3}Figure 5 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{}\includegraphics[]{image-6.png}
\caption{\label{fig_4}(}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{6}\includegraphics[]{image-7.png}
\caption{\label{fig_5}Figure 6 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{7}\includegraphics[]{image-8.png}
\caption{\label{fig_6}Figure 7 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{8}\includegraphics[]{image-9.png}
\caption{\label{fig_7}Figure 8 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{9}\includegraphics[]{image-10.png}
\caption{\label{fig_8}Figure 9 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{10}\includegraphics[]{image-11.png}
\caption{\label{fig_9}Figure 10 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{1} \par 
\begin{longtable}{P{0.43013953488372086\textwidth}P{0.05613953488372093\textwidth}P{0.040325581395348836\textwidth}P{0.1518139534883721\textwidth}P{0.1715813953488372\textwidth}}
\multicolumn{3}{l}{Compositional Analysis of GLP to C12+}\tabcellsep \\
SamplingLocation\tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{ALSABANA}\\
CylinderNumber\tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{CLM009}\\
SamplingConditions\tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{30,0 psig @ 66.0°F}\\
Component\tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Mole \% Weight \%}\\
CO2\tabcellsep \multicolumn{3}{l}{CarbonDioxide 0,01}\tabcellsep 0,01\\
N2\tabcellsep Nitrogen\tabcellsep \tabcellsep 0,10\tabcellsep 0,06\\
C1\tabcellsep Methane\tabcellsep \tabcellsep 0,01\tabcellsep 0,00\\
C2\tabcellsep Ethane\tabcellsep \tabcellsep 3,36\tabcellsep 2,14\\
C3\tabcellsep Propane\tabcellsep \tabcellsep 71,45\tabcellsep 66,84\\
iC4\tabcellsep i-Butane\tabcellsep \tabcellsep 13,13\tabcellsep 16,20\\
nC4\tabcellsep \multicolumn{2}{l}{n-Butane}\tabcellsep 11,91\tabcellsep 14,70\\
iC5\tabcellsep \multicolumn{2}{l}{i-Pentane}\tabcellsep 0,03\tabcellsep 0,05\\
\textunderscore \textunderscore \textunderscore \textunderscore \textunderscore \textunderscore \tabcellsep \tabcellsep \tabcellsep \textunderscore \textunderscore \textunderscore \textunderscore \textunderscore \textunderscore \\
Totals :\tabcellsep \tabcellsep \tabcellsep 100,00\tabcellsep 100,00\\
\multicolumn{3}{l}{Note: 0,00 meanslessthan 0,005.}\tabcellsep \\
\multicolumn{3}{l}{Calculated Whole Gas Properties}\tabcellsep \\
Gas Gravity\tabcellsep \tabcellsep 1,6272\tabcellsep \tabcellsep (Air = 1 @ 14,73 psia\& 60°F)\\
\multicolumn{2}{l}{WholeSample Mole Weight}\tabcellsep 47,13\tabcellsep \tabcellsep g mol -1\\
Ideal Gas Density\tabcellsep \tabcellsep 1,9831\tabcellsep \tabcellsep kg m -3 @ 14,65 psia, 60°F\\
\multicolumn{2}{l}{Ideal GrossCalorificValue}\tabcellsep 2665,7\tabcellsep \tabcellsep BTU?ft -3 @ 14,65 psia, 60°F\\
Ideal Net CalorificValue\tabcellsep \tabcellsep 2454,5\tabcellsep \tabcellsep BTU?ft -3 @ 14,65 psia, 60°F\\
PseudoCriticalPress.\tabcellsep \tabcellsep 598,7\tabcellsep \tabcellsep psia\\
PseudoCriticalTemp.\tabcellsep \tabcellsep 682,1\tabcellsep \tabcellsep Rankine\\
\multicolumn{4}{l}{Gas Compressibility Factor, Z 0,979184}\tabcellsep @ 14,65 psia\& 60°F\\
GPM (C2+)\tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{28,49}\\
GPM (C3+)\tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{27,60}\\
Additional Information\tabcellsep \tabcellsep \tabcellsep \\
\multicolumn{2}{l}{Real GrossCalorificValue}\tabcellsep 2722,4\tabcellsep \tabcellsep BTU?ft -3 @ 14,65psia, 60°F\\
Real Net CalorificValue\tabcellsep \tabcellsep 2506,6\tabcellsep \end{longtable} \par
 
\caption{\label{tab_0}Table 1 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2} \par 
\begin{longtable}{}
\end{longtable} \par
 
\caption{\label{tab_1}Table 2}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2} \par 
\begin{longtable}{P{0.3578125\textwidth}P{0.19218749999999998\textwidth}P{0.146875\textwidth}P{0.15312499999999998\textwidth}}
Fuel type\tabcellsep GNC (55 psig)\tabcellsep GLP (55 psig)\tabcellsep Diesel (5 psig)\\
Mean time to repair\tabcellsep 20,000 h\tabcellsep 20,000 h\tabcellsep 20,000 h\\
Nominal full power\tabcellsep 30 kW net (+/-1 kW)\tabcellsep 30 kW net (+/-1\tabcellsep 29 kW net (+/-1 kW)\\
\tabcellsep \tabcellsep kW)\tabcellsep \\
Peak efficiency (LHV**)\tabcellsep 27\% (+/-2\%)\tabcellsep 27\% (+/-2\%)\tabcellsep 26\% (+/-2\%)\\
Fuel consumption***\tabcellsep 18,7 lb/h, 8,5 kg/h\tabcellsep 19,0 lb/h, 8,6 kg/h\tabcellsep 21,9 lb/h, 10,0 kg/h\\
Methane based fuel flow (Metan-HHV)\tabcellsep 440,000 kJ/h (420,000 Btu/h)\tabcellsep \tabcellsep \\
\multicolumn{2}{l}{Methane based energy of exhaust gases 305,000 kJ/h (290,000 Btu/hr)}\tabcellsep \tabcellsep \\
Exhaust gases temperature\tabcellsep 500°F, 261°C\tabcellsep 500°F, 261°C\tabcellsep 500°F, 261°C\\
Output voltage\tabcellsep 250-700 VDC\tabcellsep 250-700 VDC\tabcellsep 250-700 VDC\end{longtable} \par
  {\small\itshape [Note: * Source: Capstone Turbine Corporation]} 
\caption{\label{tab_2}Table 2 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{7} \par 
\begin{longtable}{P{0.10260631001371742\textwidth}P{0.10493827160493827\textwidth}P{0.0874485596707819\textwidth}P{0.11310013717421125\textwidth}P{0.07345679012345678\textwidth}P{0.07345679012345678\textwidth}P{0.093278463648834\textwidth}P{0.08511659807956104\textwidth}P{0.06529492455418381\textwidth}P{0.05130315500685871\textwidth}}
Tiempo [min:s]\tabcellsep Speed [min -1 ]\tabcellsep Power [W]\tabcellsep TET [F]\tabcellsep TEC [F]\tabcellsep Wair [pph]\tabcellsep Amb. pressure [psia]\tabcellsep Suplied energy (btu/s) W energy\tabcellsep Accel. [\%]\tabcellsep Frequency [Hz]\\
00:0\tabcellsep 96320\tabcellsep 20277\tabcellsep 1102,2\tabcellsep 69,9\tabcellsep 1694\tabcellsep 10,7\tabcellsep 46,6\tabcellsep 60,8\tabcellsep 60\\
00:01\tabcellsep 96236\tabcellsep 20369\tabcellsep 1101,2\tabcellsep 69,9\tabcellsep 1695\tabcellsep 10,7\tabcellsep 47,2\tabcellsep 60,3\tabcellsep 60\\
02:49\tabcellsep 94028\tabcellsep 18104\tabcellsep 1109,8\tabcellsep 72\tabcellsep 1614\tabcellsep 10,6\tabcellsep 41\tabcellsep 57,1\tabcellsep 60\\
10:00\tabcellsep 91236\tabcellsep 23675\tabcellsep 1110,1\tabcellsep 74,4\tabcellsep 1532\tabcellsep 10,6\tabcellsep 42,3\tabcellsep 58,5\tabcellsep 60\\
10:01\tabcellsep 86408\tabcellsep 21181\tabcellsep 1129,9\tabcellsep 74,4\tabcellsep 1394\tabcellsep 10,6\tabcellsep 35\tabcellsep 53\tabcellsep 60\\
10:02\tabcellsep 81252\tabcellsep 17794\tabcellsep 1144,6\tabcellsep 74,4\tabcellsep 1265\tabcellsep 10,6\tabcellsep 32,4\tabcellsep 49,4\tabcellsep 60\\
10:03\tabcellsep 76490\tabcellsep 14693\tabcellsep 1164,9\tabcellsep 74,4\tabcellsep 1138\tabcellsep 10,6\tabcellsep 29,1\tabcellsep 80,9\tabcellsep 60\\
10:04\tabcellsep 73480\tabcellsep 9882\tabcellsep 1203,5\tabcellsep 74,2\tabcellsep 1057\tabcellsep 10,6\tabcellsep 22,5\tabcellsep 42,4\tabcellsep 60\\
10:43\tabcellsep 58912\tabcellsep 3206\tabcellsep 1259,8\tabcellsep 75,9\tabcellsep 737\tabcellsep 10,7\tabcellsep 12,8\tabcellsep 35,7\tabcellsep 60\\
10:45\tabcellsep 58678\tabcellsep 3432\tabcellsep 1258,4\tabcellsep 76\tabcellsep 728\tabcellsep 10,7\tabcellsep 14\tabcellsep 36,7\tabcellsep 60\\
13:51\tabcellsep 59852\tabcellsep 1629\tabcellsep 1126,8\tabcellsep 80,4\tabcellsep 772\tabcellsep 10,7\tabcellsep 46,6\tabcellsep 100\tabcellsep 60\\
13:55\tabcellsep 54208\tabcellsep 2411\tabcellsep 1097,5\tabcellsep 80,4\tabcellsep 667\tabcellsep 10,7\tabcellsep 0\tabcellsep 0\tabcellsep 60\\
13:56\tabcellsep 52114\tabcellsep 2144\tabcellsep 1095,2\tabcellsep 80,2\tabcellsep 630\tabcellsep 10,7\tabcellsep 0\tabcellsep 0\tabcellsep 60\\
13:57\tabcellsep 50106\tabcellsep 1885\tabcellsep 1094,5\tabcellsep 80,2\tabcellsep 594\tabcellsep 10,7\tabcellsep 0\tabcellsep 0\tabcellsep 60\\
14:36\tabcellsep 44950\tabcellsep 120\tabcellsep 1029,2\tabcellsep 78,8\tabcellsep 518\tabcellsep 10,6\tabcellsep 0\tabcellsep 0\tabcellsep 60\end{longtable} \par
  {\small\itshape [Note: *]} 
\caption{\label{tab_3}Table 7 :}\end{figure}
 			\footnote{© 2022 Global JournalsPerformance of a Capstone Gas Turbine based Power Plant Working on High Butane LPG} 			\footnote{Year 2022 © 2022 Global Journals Performance of a Capstone Gas Turbine based Power Plant Working on High Butane LPG} 			\footnote{© 2022 Global Journals} 		 		\backmatter  			  				\begin{bibitemlist}{1}
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