The power generation efficiency of gas-fired internal combustion engine is usually between 30% and 40%, and the more common models can reach 35%. The most prominent advantage of gas-fired internal combustion engine is high power generation efficiency, followed by high equipment integration, fast installation, low requirements for dust in gas, basically no water, and the unit kilowatt cost of the equipment is relatively low. However, the internal combustion engine also has some shortcomings. First of all, when the internal combustion engine burns low calorific value fuel, the unit output drops obviously. A 500 kW gas-fired internal combustion generator set burning 8000 kcal / m3 natural gas fuel with low calorific value may drop to 350-400kw when using coking gas with low calorific value of 4000 kcal / m3.

此外，內(nèi)燃機(jī)需要頻繁更換機(jī)油和火花塞，消耗材料比較大，也影響到設(shè)備的可用性和可靠性兩個(gè)主要設(shè)備利用指標(biāo)，對(duì)設(shè)備利用率影響比較大，有時(shí)不得不采取增加發(fā)電機(jī)組臺(tái)數(shù)的辦法，來消除利用率低的影響。內(nèi)燃機(jī)設(shè)備對(duì)焦化煤氣中的水分子含量和硫化氫比較敏感，可能導(dǎo)致硫化氫和水形成硫酸腐蝕問題，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, and the consumption of materials is relatively large, which also affects the availability and reliability of the two main equipment utilization indexes, and has a greater impact on the equipment utilization rate. Sometimes, it is necessary to increase the number of generating units 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, and some necessary measures should be taken to overcome it.

燃?xì)廨啓C(jī)比較適用于高含氫低熱值和氣體含雜質(zhì)較多的劣質(zhì)燃料，一些燃?xì)廨啓C(jī)甚至使用原油和高硫渣油燃料。燃?xì)廨啓C(jī)自身的發(fā)電效率不算很高，一般在30%～35%之間，但是產(chǎn)生的廢熱煙氣溫度高達(dá)450～550℃，可以通過余熱鍋爐再次回收熱能轉(zhuǎn)換蒸汽，驅(qū)動(dòng)蒸汽輪機(jī)再發(fā)一次電，形成燃?xì)廨啓C(jī)--蒸汽輪機(jī)聯(lián)合循環(huán)發(fā)電，發(fā)電效率可以達(dá)到45%~50%，一些大型機(jī)組甚至可以超過55%。

Gas turbine is more suitable for the inferior fuel with high hydrogen content and low calorific value and gas containing more impurities. Some gas turbines even use crude oil and high sulfur residue fuel. The power generation efficiency of gas turbine itself is not very high, generally between 30% and 35%, but the temperature of waste heat flue gas generated is as high as 450 ~ 550 ℃, which can be recycled by waste heat boiler to convert steam, drive steam turbine to generate electricity again, and form gas turbine steam turbine combined cycle power generation. The power generation efficiency can reach 45% ~ 50%, and some large units can even exceed 55% 。

采用燃?xì)廨啓C(jī)的優(yōu)勢(shì)相對(duì)比較多，首先是設(shè)備的可用性和可靠性都比較高，綜合利用率一般可以保持在90%;其次，對(duì)于燃料的適應(yīng)性比較強(qiáng)，含硫、含塵高一點(diǎn)問題都不大;再有就是發(fā)電出力一般不會(huì)減少，甚至因?yàn)槿剂线M(jìn)氣量增加而有所增加;此外，燃?xì)廨啓C(jī)功率密度大體積小，比較適合再移動(dòng)，便于轉(zhuǎn)移運(yùn)行現(xiàn)場，這對(duì)于存在一些不確定性的焦化廠項(xiàng)目的焦化煤氣利用非常有利。但是，世上的事務(wù)有一利，必有一弊，沒有十全十美的事情。

The advantages of using gas turbine are relatively more. Firstly, the availability and reliability of the equipment are relatively high, and the comprehensive utilization rate can generally be maintained at 90%; secondly, the adaptability of fuel is relatively strong, and the problems of high sulfur content and dust content are not obvious; thirdly, the power generation output will not decrease in general, even increased due to the increase of fuel intake; In addition, the gas turbine has large power density and small volume, which is suitable for re moving and easy to transfer the operation site, which is very beneficial to the utilization of coking gas in coking plant projects with some uncertainties. However, the affairs of the world have one advantage and one disadvantage. There is no perfect thing.

燃?xì)廨啓C(jī)進(jìn)氣壓力比較大，越是發(fā)電效率高的機(jī)組燃料進(jìn)氣壓力越高，因?yàn)榻够簹獗旧頉]有什么壓力，這就需要使用燃?xì)鈮嚎s機(jī)，壓縮燃?xì)庑枰拇罅康哪芰浚绊懙皆O(shè)備的實(shí)際輸出功率，一些項(xiàng)目甚至需要消耗燃?xì)廨啓C(jī)15%~20%的功率，對(duì)于聯(lián)合循環(huán)項(xiàng)目達(dá)到影響可能是10%~15%的輸出功率;采用聯(lián)合循環(huán)系統(tǒng)存在與蒸汽輪機(jī)相同的水資源條件要求，系統(tǒng)比較復(fù)雜，投資也比較大，同時(shí)搬遷也比較困難。

The inlet pressure of gas turbine is relatively large, and the higher the unit with high power generation efficiency, the higher the fuel inlet pressure. Because coking gas itself has no pressure, it needs to use gas compressor. Compressing gas needs to consume a lot of energy, which affects the actual output power of the equipment. Some projects even need to consume 15% ~ 20% of the power of the gas turbine, which has an impact on the combined cycle project The impact may be 10% - 15% of the output power; the combined cycle system has the same water resource requirements as the steam turbine, which is more complex, more investment, and more difficult to relocate.

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