你好,欢迎来到济南济柴环能燃气发电设备有限公司官方网站!

不同使用功能的发电机组的“共性”

来源:http://www.huannengpower.com   发布于:2018-09-18

①性能参数

1. Performance parameters

燃气轮机组与内燃机组热电输出特性将影响分布系统的性能,小型燃气轮机组适用于较大规模的分布系统,内燃机组适用于较小规模的分布系统。相近发电功率下,内燃机组的发电效率比小型燃气轮机组高,但前者的排烟温度较低。此外,与内燃机组相比,燃气轮机组性能受海拔和环境温度影响较大,但在确定厂址的前提下,负荷变化对两种发电机组性能的影响较为突出。

Thermoelectric output characteristics of gas turbine and internal combustion unit will affect the performance of distribution system. Small gas turbine unit is suitable for large-scale distribution system, and internal combustion unit is suitable for small-scale distribution system. Under similar power generation, the efficiency of internal combustion unit is higher than that of small gas turbine unit, but the exhaust gas temperature of the former is lower. In addition, compared with internal combustion units, the performance of gas turbine units is greatly affected by altitude and ambient temperature, but under the premise of determining the site of the plant, the impact of load changes on the performance of the two generators is more prominent.

②变工况特性

Variable operating characteristics

在分布系统中,发电机组常运行在部分负荷状态下,其变工况特性对分布系统综合性能影响较大。以发电功率均为3MW的燃气轮机组、内燃机组为例,热效率、发电效率随负荷率的变化。可知,随着负荷率的降低,两种发电机组的发电效率均呈现下降趋势,但内燃机组的发电效率比燃气轮机组高10%(绝对值)左右。燃气轮机组的热效率明显高于内燃机组,前者的热效率随着负荷率的降低而降低,后者的热效率随着负荷率的降低有上升趋势。由以上分析可知,尽管两种发电机组在额定工况下具有大致相同的热电总效率(热效率与发电效率之和),但内燃机组的变工况特性更优。

In the distributed system, the generator set often runs under partial load, and its off-design characteristics have great influence on the comprehensive performance of the distributed system. Taking gas turbine and internal combustion unit with generating power of 3 MW as an example, the thermal efficiency and power generation efficiency change with load rate. It can be seen that, with the reduction of load rate, the generation efficiency of the two generators shows a downward trend, but the generation efficiency of the internal combustion unit is about 10% (absolute value) higher than that of the gas turbine unit. The thermal efficiency of gas turbine unit is obviously higher than that of internal combustion unit. The thermal efficiency of the former decreases with the decrease of load rate, while that of the latter increases with the decrease of load rate. From the above analysis, it can be seen that although the two generators have roughly the same total thermoelectric efficiency (the sum of thermal efficiency and power generation efficiency) under rated conditions, the off-design characteristics of internal combustion units are better.

QQ截图20171025151903.jpg

③余热特性

Waste heat characteristics

a.燃气轮机组

A. gas turbine unit

微型燃气轮机组的烟气温度较低,集中在300℃左右,主要用于制冷、供暖、制备生活热水,少数情况用于生产低压蒸汽。小型燃气轮机组的烟气温度较高,烟气温度在500℃以上的机组占68.5%,烟气温度在450℃以上的机组占93.8%,主要用于生产高压蒸汽,除直接利用及利用蒸汽型吸收式冷水机组制冷外,还可推动蒸汽轮机发电机组发电,组成燃气轮机组一蒸汽联合循环系统。

The flue gas temperature of the micro gas turbine set is low, which is concentrated around 300 C. It is mainly used for refrigeration, heating and domestic hot water preparation. In a few cases, it is used to produce low pressure steam. The flue gas temperature of small gas turbine is higher, 68.5% of the units whose flue gas temperature is above 500 C and 93.8% of the units whose flue gas temperature is above 450 C. It is mainly used to produce high pressure steam. Besides directly utilizing and utilizing steam absorption chiller to refrigerate, it can also drive steam turbine generator to generate electricity and form gas. The steam turbine is a steam combined cycle system.

b.内燃机组

B. internal combustion unit

与燃气轮机组的余热全部体现在烟气不同,内燃机的余热分为两部分:一部分为缸套冷却水余热,是为保证燃气内燃机正常工作温度,通过冷却系统带走的热量,温度较低;另一部分为烟气余热,是燃料燃烧做功后烟气携带的热量,烟气温度基本介于微型与小型燃气轮机组之间。由于缸套冷却水温度较低,主要用于供热、制备生活热水,烟气可用于驱动吸收式冷水机组及生产蒸汽外输。

The waste heat of internal combustion engine is divided into two parts: one part is the waste heat of cylinder liner cooling water, which is to ensure the normal working temperature of the gas internal combustion engine, and the heat carried by the cooling system is relatively low; the other part is the waste heat of flue gas, which is carried by the flue gas after the work of fuel combustion. The heat and flue gas temperature are basically between micro and small gas turbine units. Because the cylinder liner cooling water temperature is low, mainly used for heating, preparation of domestic hot water, flue gas can be used to drive absorption chillers and production steam outward.

④燃气进气压力

4. Gas inlet pressure

一般情况下,发电机组燃气进气压力由低到高的顺序为:内燃机组,微型燃气轮机组,小型燃气轮机组。小型燃气轮机组进气压力比较大,一般为高压或次高压,因此需要增设燃气压缩机,而燃气压缩过程需要消耗大量能量,影响到小型燃气轮机的实际输出功率,一些项目甚至需要消耗小型燃气轮机15%~20%的输出功率。内燃机组与微型燃气轮机组燃气进气压力较低,通常为低压或中压。

In general, the order of gas intake pressure from low to high is: internal combustion unit, micro gas turbine unit, small gas turbine unit. The intake pressure of small gas turbines is relatively high, usually high pressure or sub-high pressure, so it is necessary to add gas compressor. The process of gas compression needs to consume a lot of energy, which affects the actual output power of small gas turbines. Some projects even need to consume 15%-20% output power of small gas turbines. The intake pressure of internal combustion units and micro gas turbine units is low, usually low or medium pressure.

更多的关于燃气发电机组问题或者详细的内容,请进入我们公司的网站:http://www.huannengpower.com  网站中会有很多的内容仅供参考。

For more information on gas-fired generating units, please visit our website: http://www.huannengpower.com. There will be a lot of information for reference only.


上一篇:焦化尾气发电使用技术的发展
下一篇:最后一页