The power generation efficiency of gas generator set is usually between 30% - 40%, and the common model can generally reach 35%. The outstanding advantages of gas-fired internal combustion engine are relatively high power generation efficiency, followed by high equipment integration, fast installation, low requirements for dust in the gas, basically no water, and low cost per kilowatt of equipment.

但是内燃机也有一些不足的地方，首先，内燃机燃烧低热值燃料时，机组出力明显下降，一台燃烧低热值8000大卡/立方米天然气燃料的500千瓦级燃气内燃发电机组，在使用低热值4000大卡/立方米的焦化煤气时，出力可能下降到350～400kW左右。

However, the internal combustion engine also has some deficiencies. First, when the internal combustion engine burns low calorific value fuel, the output of the unit decreases significantly. When a 500 kW gas-fired internal combustion generator unit burning 8000 kcal / m3 natural gas fuel with low calorific value uses 4000 kcal / m3 coking gas, the output may drop to about 350 ~ 400KW.

此外，内燃机需要频繁更换机油和火花塞，消耗材料比较大，也影响到设备的可用性和可靠性两个主要设备利用指标，对设备利用率影响比较大，有时不得不采取增加发电机组台数的办法，来消除利用率低的影响。内燃机设备对焦化煤气中的水分子含量和硫化氢比较敏感，可能导致硫化氢和水形成硫酸腐蚀问题，需要采取一些必要措施加以克服。

In addition, the internal combustion engine needs to change the engine oil and spark plug frequently, which consumes a large amount of materials, and also affects the two main equipment utilization indexes of equipment availability and reliability, which has a great impact on the equipment utilization rate. Sometimes, we have to increase the number of generator sets to eliminate the impact of low utilization rate. Internal combustion engine equipment is sensitive to water molecular content and hydrogen sulfide in coking gas, which may lead to sulfuric acid corrosion of hydrogen sulfide and water. Some necessary measures need to be taken to overcome it.

燃气轮机比较适用于高含氢低热值和气体含杂质较多的劣质燃料，一些燃气轮机甚至使用原油和高硫渣油燃料。

Gas turbines are more suitable for inferior fuels with high hydrogen content, low calorific value and high gas impurities. Some gas turbines even use crude oil and high sulfur residue fuel.

燃气轮机自身的发电效率不算很高，一般在30%～35%之间，但是产生的废热烟气温度高达450～550℃，可以通过余热锅炉再次回收热能转换蒸汽，驱动蒸汽轮机再发一次电，形成燃气轮机--蒸汽轮机联合循环发电，发电效率可以达到45%~50%，一些大型机组甚至可以超过55%。

The power generation efficiency of gas turbine itself is not very high, generally between 30% ~ 35%, but the temperature of waste heat flue gas is as high as 450 ~ 550 ℃, which can recover heat energy again through waste heat boiler, convert steam, drive steam turbine to generate electricity again, and form gas turbine steam turbine combined cycle power generation, and the power generation efficiency can reach 45% ~ 50%, Some large units can even exceed 55%.

采用燃气轮机的优势相对比较多，首先是设备的可用性和可靠性都比较高，综合利用率一般可以保持在90%;其次，对于燃料的适应性比较强，含硫、含尘高一点问题都不大;再有就是发电出力一般不会减少，甚至因为燃料进气量增加而有所增加;此外，燃气轮机功率密度大体积小，比较适合再移动，便于转移运行现场，这对于存在一些不确定性的焦化厂项目的焦化煤气利用非常有利。

There are many advantages of using gas turbine. First, the availability and reliability of the equipment are relatively high, and the comprehensive utilization rate can generally be maintained at 90%; Secondly, it has strong adaptability to fuel, and there is no problem with high sulfur and dust content; In addition, the power generation output generally does not decrease, even increases due to the increase of fuel intake; In addition, the gas turbine has large power density and small volume, which is more suitable for re movement and easy to transfer the operation site, which is very beneficial to the utilization of coking gas in coking plant projects with some uncertainties.