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内燃式燃气发电机组与蒸汽轮机的使用区别

来源:http://www.huannengpower.com   发布于:2018-03-12

内燃式燃气发电机组的发电效率通常在30%-40%之间,比较常见的机型一般可以达到35%。内燃式燃气发电机组最突出的优点正是发电效率比较高,其次是设备集成度高,安装快捷,对于气体中的粉尘要求不高,基本不需要水,设备的单位千瓦造价也比较低。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。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。

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.

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内燃式燃气发电机组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。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。

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.

燃气轮机自身的发电效率不算很高,一般在30%~35%之间。其优点是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。

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.

但是,世上的事务有一利,必有一弊,没有十全十美的事情。燃气轮机进气压力比较大,越是发电效率高的机组燃料进气压力越高,因为焦化煤气本身没有什么压力,这就需要使用燃气压缩机,压缩燃气需要消耗大量的能量,影响到设备的实际输出功率,一些项目甚至需要消耗燃气轮机15%~20%的功率,对于联合循环项目达到影响可能是10%~15%的输出功率;采用联合循环系统存在与蒸汽轮机相同的水资源条件要求,系统比较复杂,投资也比较大,同时搬迁也比较困难。

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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