The power generation efficiency of internal combustion gas turbine usually in common between 30% - 40%, the general model can reach 35%. The most outstanding advantage of the internal combustion gas generating set is that the power generation efficiency is relatively high. Secondly, the equipment is highly integrated, and the installation is fast. The requirement for the dust in the gas is not high, basically no water is needed, and the unit cost of the equipment is relatively low. The internal combustion engine but there are some deficiencies, firstly, the combustion of low calorific value fuel, the unit output decreased, a low calorific value gas 500 kilowatt diesel generator sets 8000 kcal / m3 of natural gas, coking gas in 4000 kcal / m3 using low calorific value, the output may drop to 350 ~ 400kW about. In addition, the internal combustion engine oil and spark plugs need frequent replacement, the material consumption is relatively large, but also affect the availability and reliability of the equipment of the two major equipment utilization index, a great impact on the equipment utilization rate, increase power generation units sometimes had to take measures to eliminate the influence of low utilization rate.
The internal combustion gas generator set is sensitive to the content of water molecules and hydrogen sulfide in coking gas, which may lead to sulfuric acid corrosion of hydrogen sulfide and water, and some necessary measures should be taken to overcome it. Gas turbine is suitable for low calorific value and high hydrogen containing gas containing impurities of low-grade fuel gas turbine, some even use crude oil and high sulfur residue fuel.
The gas turbine's own power generation efficiency is not very high, usually between 30% and 35%. The utility model has the advantages of strong adaptability for fuels, sulfur and dust high point problems are not big; then there is the general power output will not be reduced, or even because the fuel intake increased and increased; in addition, the gas turbine power density, small volume, and more suitable for mobile operation, it facilitates the transfer of this scene, for the existence of coking gas some of the uncertainty of the coking plant project uses very favorable.
But there is a pros and cons in the affairs of the world, and there is no perfect thing. Gas turbine inlet pressure is relatively large, the more the unit fuel inlet pressure high power generation efficiency is high, because the coking gas itself is not what pressure, which requires the use of gas compressor, compressed gas requires a lot of energy, affect the actual output power of the power equipment, even some of the projects need to consume 15%~20% gas turbine, the joint recycling project to achieve the effect may be the output power of 10%~15%; the combined cycle system requirements of water resources under the same conditions with the steam turbine, the system is more complex, the investment is relatively large, at the same time, the relocation is also difficult.
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