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Combustion engine
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Gas Turbine(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)

上市日期: 2018-08-22

Gas turbine is a kind of internal combustion power machine, which uses continuous flow gas as working medium to drive the impeller to rotate at high speed and change the energy of fuel into useful work. The structure of gas turbine is the simplest, and it can embody a series of advantages, such as small volume, light weight, fast start-up, less or no cooling water.


In the main flow of air and gas, the gas turbine cycle consists of compressor, combustor and gas turbine, which is called simple cycle. Most gas turbines use simple cycle.


The compressor sucks air from the outside atmosphere and compresses it step by step through an axial-flow compressor to make it pressurized, and the air temperature increases accordingly; the compressed air is pressed into the combustor and mixed with the fuel injected into it to produce high temperature and high pressure gas; then it enters the turbine to expand and do work to impel the turbine to drive the compressor. With the external load rotor rotating at high speed, the chemical energy of gas or liquid fuel can be partly converted into mechanical power and output electrical power. The exhaust gas discharged from the turbine is discharged to the atmosphere for natural heat release. In this way, the gas turbine converts the chemical energy of the fuel into thermal energy, and part of the thermal energy into mechanical energy. Usually in a gas turbine, the compressor is driven by the expansion of the gas turbine, which is the load of the turbine. In a simple cycle, about one-third to two-thirds of the mechanical power generated by the turbine is used to drive the compressor, and about one-third of the rest is used to drive the generator. When starting a gas turbine, the external power is needed first, usually the starter drives the compressor. Until the mechanical power generated by the gas turbine is greater than the mechanical power consumed by the compressor, the external starter trips off and the gas turbine can work independently.


The working process of a gas turbine is that the compressor (compressor) continuously sucks air from the atmosphere and compresses it; the compressed air enters the combustion chamber, combusts with the injected fuel, and becomes a high temperature gas, which then flows into the gas turbine and expands to do work, pushing the turbine impeller to rotate with the compressor impeller. After heating, the high-temperature gas has a remarkable improvement in the working capacity, so the gas turbine can drive the compressor, but at the same time, it still has surplus work as the output mechanical work of the gas turbine. When a gas turbine starts at rest, it needs to be rotated by the starter. The starter will not be released until it is accelerated to independent operation.

The working process of a gas turbine is the simplest, known as a simple cycle; in addition, there are regenerative cycles and complex cycles. The working medium of the gas turbine comes from the atmosphere and is finally discharged to the atmosphere. It is an open cycle. In addition, there is a closed cycle in which the working medium is closed. The combination of gas turbine and other heat engines is called compound cycle device.

The compression ratio of gas initial and mild compressor is the two main factor that affects the efficiency of gas turbine. Increasing the initial temperature of gas and increasing the compression ratio can significantly improve the efficiency of gas turbines. In the late 1970s, the highest compression ratio was 31; the highest initial gas temperature of industrial and marine gas turbines was about 1200, and that of aviation gas turbines was more than 1350.

internal structure

Combustion chambers and turbines not only work at high temperatures, but also withstand the thermal shock caused by drastic changes in temperature during start-up and shutdown of gas turbines, and work under harsh conditions. Therefore, they are the key components to determine the life of gas turbines. In order to ensure adequate life, the worst working conditions of these two components, such as flame tube and blade, must be made of nickel-based and cobalt-based alloys and other high-temperature materials, but also with air cooling to reduce the working temperature.

Auxiliary system

Lubricating oil system is an essential auxiliary system for any gas turbine. Its function is to supply plenty of clean lubricating oil with suitable temperature and pressure to the bearings, transmission devices and their accessories of the gas turbine generator set in operation during the start-up, normal operation and shutdown of the unit, so as to ensure the safe and reliable operation of the unit and prevent bearing burnout. Excessive bending of rotor journal and deformation of high speed gear flange. In addition, some of the lubricants may be diverted from the system to become the oil source of the hydraulic oil system or filtered to be used as the oil for the control oil system. Composition: gas turbine lubricating oil tank, gas turbine main lubricating oil pump, gas turbine auxiliary oil pump, gas turbine emergency oil pump.


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