The principle of coal-fired power generation includes three main processes: combustion, steam circulation, and power generation. The following is a detailed explanation:

1. 燃烧过程：燃煤机组使用煤炭作为燃料，在燃烧过程中，煤炭在高温条件下与空气中的氧气反应，产生高温燃烧气体。这个燃烧过程中产生的高温气体包含有大量的热能。

1. Combustion process: Coal fired units use coal as fuel. In the combustion process, coal reacts with oxygen in the air at high temperature to produce high-temperature combustion gas. The high-temperature gas generated during this combustion process contains a large amount of thermal energy.

2. 蒸汽循环过程：在燃烧后产生的高温气体通过锅炉，将其中的热能转移到水中，使得水被加热并转化为蒸汽。蒸汽通过高压管道输送到蒸汽涡轮上。

2. Steam cycle process: The high-temperature gas generated after combustion passes through the boiler, transferring the heat energy from it to water, causing the water to be heated and converted into steam. Steam is transported to the steam turbine through high-pressure pipelines.

3. 发电过程：蒸汽涡轮接收到高温高压的蒸汽后开始旋转，通过与发电机相连的轴组转动发电机。发电机中的转子在磁场的作用下，产生电流，从而将热能转化为电能。后，电能通过变压器升压后，进入电网供应给用户。

3. Power generation process: After receiving high-temperature and high-pressure steam, the steam turbine starts to rotate and rotates the generator through a shaft set connected to the generator. The rotor in the generator generates current under the action of a magnetic field, thereby converting thermal energy into electrical energy. Finally, the electrical energy is boosted through a transformer and supplied to the user through the power grid.

总结来说，燃煤机组发电原理就是利用燃烧煤炭产生高温气体，将其中的热能转移到水中，使得水转化为蒸汽，再通过蒸汽涡轮带动发电机转动，终将热能转化为电能供应给用户。

In summary, the principle of coal-fired power generation is to use the combustion of coal to generate high-temperature gas, transfer the heat energy from it to water, convert the water into steam, and then drive the generator to rotate through a steam turbine, ultimately converting the heat energy into electrical energy and supplying it to users.

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