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燃气发电机组与燃气轮机的操作对比

来源:http://www.huannengpower.com   发布于:2019-03-20

燃气发电机组的发电效率通常在30%-40%之间,比拟常见的机型普通能够到达35%。燃气内燃机突出的优点正是发电效率比拟高,其次是设备集成度高,装置快捷,关于气体中的粉尘请求不高,根本不需求水,设备的单位千瓦造价也比拟低。但是内燃机也有一些缺乏的中央,首先,内燃机熄灭低热值燃料时,机组出力明显降落,一台熄灭低热值8000大卡/立方米自然气燃料的500千瓦级燃气内燃发电机组,在运用低热值4000大卡/立方米的焦化煤气时,出力可能降落到350~400kW左右。

Generation efficiency of gas-fired generating units usually ranges from 30% to 40%, up to 35% compared with common models. The most prominent advantage of gas internal combustion engine is high power generation efficiency, followed by high integration of equipment, fast installation, low dust requirement in gas, no need for water at all, and low unit kilowatt cost of equipment. But the internal combustion engine also has some deficiencies. Firstly, when the internal combustion engine extinguishes the low calorific value fuel, the output of the unit obviously drops. When a 500 kW gas-fired internal combustion generator unit extinguishes the low calorific value 8000 kcal/cubic meter natural gas fuel, the output may drop to about 350-400 kW when using the low calorific value 4000 kcal/cubic meter coking gas.

此外,内燃机需求频繁改换机油和火花塞,耗费资料比拟大,也影响到设备的可用性和牢靠性两个主要设备应用指标,对设备应用率影响比拟大,有时不得不采取增加发电机组台数的方法,来消弭应用率低的影响。内燃机设备对焦化煤气中的水分子含量和硫化氢比拟敏感,可能招致硫化氢和水构成硫酸腐蚀问题,需求采取一些必要措施加以克制。

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In addition, the frequent replacement of oil and spark plug in internal combustion engine demands a large amount of data, which also affects the usability and reliability of the two main equipment application indicators, and has a great impact on the equipment application rate. Sometimes, the method of increasing the number of generators has to be adopted to eliminate the impact of low application rate. Internal combustion engine equipment is sensitive to water molecule content and hydrogen sulfide ratio in coking gas, which may cause hydrogen sulfide and water to form sulfuric acid corrosion problem. Some necessary measures should be taken to restrain it.

燃气轮机比拟适用于高含氢低热值和气体含杂质较多的劣质燃料,一些燃气轮机以至运用原油和高硫渣油燃料。燃气轮机本身的发电效率不算很高,普通在30%~35%之间,但是产生的废热烟气温度高达450~550℃,能够经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,构成燃气轮机--蒸汽轮机结合循环发电,发电效率能够到达45%~50%,一些大型机组以至能够超越55%。

Gas turbines are comparable to inferior fuels with high hydrogen content, low calorific value and more impurities in gases. Some gas turbines even use crude oil and high sulfur residue fuels. The generation efficiency of gas turbine itself is not very high, usually between 30% and 35%, but the temperature of waste heat flue gas generated is as high as 450-550 C. It can recover heat energy to convert steam again through waste heat boiler, drive steam turbine to generate electricity again, and form gas turbine-steam turbine combined cycle power generation. The generation efficiency can reach 45%-50%, and some large-scale units can exceed 55%. 。

采用燃气轮机的优势相比照较多,首先是设备的可用性和牢靠性都比拟高,综合应用率普通能够坚持在90%;其次,关于燃料的顺应性比拟强,含硫、含尘高一点问题都不大;再有就是发电出力普通不会减少,以至由于燃料进气量增加而有所增加;此外,燃气轮机功率密度大致积小,比拟合适再挪动,便于转移运转现场,这关于存在一些不肯定性的焦化厂项目的焦化煤气应用十分有利。

The advantages of using gas turbines are comparable, first, the availability and reliability of the equipment are comparatively high, and the comprehensive application rate can generally be maintained at 90%; secondly, the fuel compliance is comparatively strong, and the problems of high sulfur and dust content are not serious; thirdly, the power output of power generation is generally not reduced, and even increased due to the increase of fuel intake; moreover, the power density of gas turbines is high. The coking gas application of some uncertain coking plant projects is very advantageous.

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拟大,越是发电效率高的机组燃料进气压力越高,由于焦化煤气自身没有什么压力,这就需求运用燃气紧缩机,紧缩燃气需求耗费大量的能量,影响到设备的实践输出功率,一些项目以至需求耗费燃气轮机15%~20%的功率,关于结合循环项目到达影响可能是10%~15%的输出功率;采用结合循环系统存在与蒸汽轮机相同的水资源条件请求,系统比拟复杂,投资也比拟大,同时搬迁也比拟艰难。

However, there are advantages and disadvantages in the affairs of the world. There are no perfect things. The intake pressure of gas turbine is larger than that of gas turbine, and the higher the intake pressure of fuel of unit with high power generation efficiency. Because there is no pressure of coking gas itself, it is necessary to use gas compressor to tighten the demand of gas, which consumes a lot of energy and affects the practical output power of equipment. Some projects even consume 15%~20% of the power of gas turbine. The noise may be 10%~15% of the output power; the system is complex, the investment is large, and the relocation is difficult when the combined cycle system has the same water resource requirements as the steam turbine.


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